Theory of the experiment Lab Report Example | Topics and Well Written Essays - 1750 words

Theory of the experiment - Lab Report Example This can be said to be a compromise between the Class A amplifiers and the Class B amplifier topologies. These amplifiers combines the sound quality provided by the class A simplifiers and the efficiency provided by the Class B amplifiers. This is achieved by having both transistors biased to have them conduct a signal close to zero. Figure 1.3 shows a class AB amplifier and its associated input and output waveforms. When small signals are applied, both transistors will be active, making the amplifier to function like a Class A amplifier. When a large signal is applied, only one transistor becomes active. This makes the amplifier to operate like a Class B amplifier. Class AB speaker amplifiers gives a high SNR and a low THD+N. they are also about 65% efficient. These amplifiers are used in making portable media players, tablets, cameras, and so on where high fidelity is required.Class D amplifiersThese amplifiers use PWM (pulse width modulation) to produce a rail to rail output signa l. This signal has a variable duty cycle that is used to approximate the input signal which is analog in nature. These amplifiers are highly efficient and have an efficiency of about 90%. This is so because the output transistors used are fully turned on/off in a normal operating. Use of this approach eliminates the need to use the transistor’s linear region that brings in inefficiency in the other types of amplifiers. Figure 1.4 shows a basic class D amplifier and a possible waveform. Since this class of amplifier has a high efficiency.

The Ferranti Effect

The Ferranti Effect As the length of the line increases specially in extra high voltage (EHV) lines, beyond 200km, we observe a phenomenon called Ferranti Effect in no load or low load conditions. This is due to the fact that as the line length increases the capacitance of the line increases, and the shunt capacitance generates the reactive power in the line. Since there is no load or low load to consume that excessive power, this results in excessive reactive power in the line and hence the receiving end voltage gets higher than the sending end voltage. This rise in voltage may well go beyond the operative ratings of the terminal and hence might give rise to many cascading events damaging the equipments. The continuous increase of the voltage of transmission, line length and number of sub-conductors per bundle has emphasized the importance of the excessive line MVAR in EHV systems as well as associated voltage and reactive controls. During the line charging volt-amperes of the line which have exceeded the inductive VARs consumed and operation at light loads, there is an undesirable voltage rises along the line. This voltage rise in turn demands a much higher insulation level, which poses a great problem. Moreover, if the insulation against these over-voltages were to be provided in the system, then the cost of the line becomes enormous. To overcome this phenomenon, shunt reactors are required to be installed at optimized location to absorb the excessive reactive power. Though this solution has a financial cost, but this is inevitable, since the load is a random variable and the generation of the power cannot be exactly planned for sudden tripping off of the loads. Aims and objectives: The aim of this thesis project is to investigate the Ferranti effect for long length transmission lines using PowerWorld simulations on a radial system. The following are the key objectives covered in this project. Impact by varying Line lengths: Investigate the system behavior regarding Ferranti effect with different transmission line lengths. This was done by investigating the profile of the effect for long length lines and hence distributed models were considered for this analysis. 2-Impact by varying loading levels: Since Ferranti effect is the phenomenon where receiving end voltage (Loads) is lower than sending end, it was important to look into the loading factor by varying the loading levels for different line lengths. 3- Investigation for optimum load levels to avoid effect: A series of experiments were done to find the minimum values of load required for varied line lengths in order to avoid Ferranti Effect and to contain the terminal voltage near 1p.u. 4- Minimum ratings for reactors for compensation: With a varied number of simulations and experiments, the minimum ratings of required reactors have been realized in order to maintain optimized terminal ratings at receiving end. Scope of thesis: This thesis will commence with an overview of the problems encountered with EHV long transmission line. This would be followed up by a literature review that covers the research of useful background theories. The result from the performed simulations will be discussed in detail. Finally, some recommendation for future works in this area of research. Chapter 2. INTRODUCTION TO TXN LINES: The electric lines which are used to carry electric waves are called transmission lines. The transmission line parameters like inductance and capacitance are not separable unlike the lumped circuits. The transmission parameters are distributed all along the length of the transmission line. Hence the method of analyzing the transmission lines is different from analyzing the lumped circuits. In the analysis of the transmission line, only steady state currents and voltages are concerned. The analysis includes the measurement of current and voltages at any length of the line, when a known voltage is applied at one end of the transmission line. The end at which the voltages are applied is called sending end and the end at which the signals are received is called receiving end of the transmission line. 2.1-transmission line parameters: For the analysis and design of transmission lines, it is important to have knowledge of electric circuit parameters, associated with the transmission lines. Various electric parameters associated with the transmission lines are as below, 1-Resistance: Depending upon the cross sectional area of the conductors, the transmission lines has resistance associated with them. The resistance is uniformly distributed all along the transmission line. Its total value depends upon the total length of the transmission line. Hence its value is given per unit length of the transmission line. It is denoted as R and is given in ohms per unit length. 2- Inductance: When the conductors carry the current, the magnetic flux is produced around the conductors. It depends upon the magnitude of the current flowing throw the conductors. The flux linkages per ampere of the current, gives rise to the effect called inductance of the transmission line. It is also distributed all along the length of the transmission line. It is denoted as L and measured in Henry per unit length of the transmission line. 3- Capacitance: The transmission lines consist of two parallel conductors or single line w.r.t earth separated by dielectric like air. Such conductors separated by an insulating dielectric produce a capacitive effect. Due to this, there exists a capacitance associated with the transmission line which is also distributed all along the length of the conductor. It is denoted as C and measured in Farads per unit length of the transmission line. 4- Conductance: The dielectric between the conductors is not perfect. Hence a very small amount of current flows through the dielectric called displacement current. This is nothing but leakage current and this gives rise to the leakage conductance associated with the transmission line. It exists between the conductors and is distributed all along the transmission line. It is denoted as G and measured as mho per unit length of the line. Thus the four important parameters of the transmission line are R, L, C and G. as the current flows from one conductor and complete the path through other conductor, the resistance of both the wires is included when specifying the resistance per unit length of the line. These line parameters are constant and are called the primary constants of the transmission line. Revisit snaps(4-16(1)) 2.2-performance equation of long transmission line: kundar book We can analyze the performance of the line on per phase basis. The relationship between current and voltage along the one phase of the line in terms of distributed parameters can be seen in the FIG below = series impedance per unit length/phase. = shunt admittance per unit length/phase. = length of the line. The voltages and current in the figure are the phasors representing sinusoidal time varying quantities. For a differential section of the line of length at a distance from receiving end, the differential voltage can be given as . hence (2.1) The differential current flowing through shunt admittance can be given as Similarly (2.2) Differentiating eq 1 and 2 yeilds (2.3) and (2.4) Now for the general equation for voltage and current at distance x from receiving end, if the receiving end voltage and current are known, can be given as (2.5) (2.6) Whereas this is called characteristic impedance. and = = this is called propagation constant. The constant and are complex quantities. The real part of propagation constant () is called the attenuation constant , while the imaginary part is called the phase constant . Now the first term in eq.5 increase in magnitude and advances in phase as the distance increases. This term is called incident voltage. While the second term in eq.5 decreases in magnitude and distorts in phase from receiving end towards sending end, this term is called reflected voltage. At any point along the line the voltage is the sum of incident and reflected voltage. The same is true for eq.6 . If a line is terminated at its characteristic impedance , then there is no reflected voltage and the line is called a flat line or infinite line. For a typical power line, G is practically zero and R Zc = = (2.7) = = (2.8) If losses are completely neglected the is a real number and is an imaginary number. Similarly for a lossless line eq.5 and 6 can be simplified as (2.9) (2.10) The voltage and current vary harmonically along the line length. A full cycle of voltage and current along the line length corresponds to 2 radians. If is the phase shift in radians per meter, the wavelength in meters is (2.11) 2.3-Equivalent circuit representation of long transmission line: A line with length more than 160km is considered a long transmission line and the parameters are assumed to be distributed uniformly along the line as a result of which the currents and voltages would vary from point to point. Let us consider the figure below series impedance per unit length shunt admittance per unit length length of the line total series impedance total shunt admittance The elemental equivalent of the above figure can be redrawn as follows. For analysis purpose we take receiving end as reference for measuring the distance. Assume we have an elemental length at the distance of x from the receiving end. If the voltage and current at distance x are and, so at the distance of so the voltage and current becomes + and + respectively. 2.12 By manipulating above equations Similarly 2.13 With above can be written as 2.14 And 2.15 By differentiating eq 2.14 2.16 The solution of eq 2.16 is 2.17 From eq 2.14 and 2.16 2.18 Where is the characteristic impedance and is the propagation constant. Eq 2.17 and 2.18 can be written as 2.19 2.20 If receiving end voltage and current are known then Substituting above values in eq 8 and 9 Again substituting values of A and B in eq 2.19 and 2.20 2.21 2.22 Since and are the voltage and current at any point distance x from receiving end as evident from expression and (magnitude and phase) are functions of distance , receiving end voltage and receiving end current , which means that they vary as we move from receiving end towards sending end. Now the quantities and are complex For a lossless line; When dealing with high frequencies or surges normally the losses are neglected and the characteristic impedance becomes surge impedance. Due to large capacitance and lower inductance in the cables the surge impedance values can be very low. For = = the real part of propagation constant () is called the attenuation constant , while the imaginary part is called the phase constant . Eq 2.11 can be written as 2.23 The first term in the above expression is called incident voltage wave and its value increases as x is increased. Since receiving end is our reference end and as x increases the value of voltage increases meaning the magnitude of voltage decreases as it travel towards the receiving end. Thats why the first part of expression is called incident voltage and the second is called reflected voltage for the similar reason. Same can be said about the current expression as well. Voltage and current expressions can be rearranged as below 2.24 And for current 2.25 For , and 2.26 2.27 The above derived quantities are related by the general equations 2.28 2.29 Where are such that Compairing the coefficients of above expression with eq 2.28 and 2.29 From this it is clear that 2.3.1-Equivalent representation: Considering the same two terminal condition with sending and receiving end voltage and current, the network can be represented as figure below. From the above network we can derive the following expressions 2.30 2.31 By comparing eq 2.30 and 2.31 with eq 2.26 and 2.27 2.32 2.33 2.34 2.35 From eq 2.33 we can derive We can conclude from this that to get the series impedance should be multiplied with . Now to get the shunt arm of equivalent circuit we substitute in eq 2.32 Here is the total shunt admittance. So to get the total shunt arm of the equivalent th eshunt arm of the nominal should be multiplied with , so the equivalent circuit can be drawn as below. 2.3.2 Equivalent representation of long line: A similar derivation of equivalent circuit can be, the equivalent circuit can be represented as Figure below. By analyzing the circuit following expression can be extracted 2.36 2.37 Comparing eq 2.36, 2.37 with 2.26, 2.27. 2.38 2.39 2.40 2.41 Now using eq 2.40 for shunt branch of equivalent circuit we get, Therefore its evident that to get the shunt branch of equivalent circuit, we have to multiply with the shunt branch of nominal circuit. For series impedance eq 2.40 is substituted in eq 2.38, which gives So here we get the factor for multiplication with nominal circuit to get equivalent circuit impedance. And the resultant circuit can be drawn as figure below. 2.4-Fundamental requirements in ac power transmission: Bulk transmission of electrical power by ac in possible only if the following two fundamental requirements are satisfied. Major synchronous machines must remain stable in synchronism: The major synchronous machines in a transmission system are the generators which are incapable of operating usefully other than in synchronism with all the others. And this also is the fundamental of stability. Voltages must be kept near to their rated values: The second main requirement in ac transmission is the maintenance of correct voltage levels. Power systems are not inherently tolerant of abnormal voltages even for short periods. Undervoltage: this is generally associated with heavy loading and/or shortage of generation, causes degradation in the performance of loads. In heavy loaded systems, undervoltage may be an indication that the load is approaching the steady state stability limit. Sudden undervoltages can result from the connection of very large loads. Over voltages: this is a dangerous condition because of the risk of flashover or the breakdown of insulation. Over voltages arise from several causes. The reduction of load during certain parts of the daily load cycle causes a gradual voltage rise. Uncontrolled, this overvoltage would shorten the useful life of insulation even if the breakdown level were not reached. Sudden overvoltage can result from the disconnection of loads or other equipment, while overvoltages of extreme rapidly and severity can be caused by the line switching operation, faults and lightning. In the long transmission line this would limit the power transfer and the transmission distance if no compensating measures were taken. Chapter 3 compensated/uncompensated lines 3.1-Charging current in lines: Despite being able to avoid wire resistance through the use of superconductors in this thought experiment, we cannot eliminate capacitance along the wires lengths. Any pair of conductors separated by an insulating medium creates capacitance between those conductors: (Figure ) Voltage applied between two conductors creates an electric field between those conductors. Energy is stored in this electric field, and this storage of energy results in an opposition to change in voltage. The reaction of a capacitance against changes in voltage is described by the equation i = C(de/dt), which tells us that current will be drawn proportional to the voltages rate of change over time. Thus, when the switch is closed, the capacitance between conductors will react against the sudden voltage increase by charging up and drawing current from the source. According to the equation, an instant rise in applied voltage (as produced by perfect switch closure) gives rise to an infinite charging current. However, the current drawn by a pair of parallel wires will not be infinite, because there exists series impedance along the wires due to inductance. (Figure below) Remember that current through any conductor develops a magnetic field of proportional magnitude. Energy is stored in this magnetic field, (Figure below) and this storage of energy results in an opposition to change in current. Each wire develops a magnetic field as it carries charging current for the capacitance between the wires, and in so doing drops voltage according to the inductance equation e = L(di/dt). This voltage drop limits the voltage rate-of-change across the distributed capacitance, preventing the current from ever reaching an infinite magnitude: Equivalent circuit showing stray capacitance and inductance. The effect of capacitance of an overhead transmission line above 160km long is taken into consideration for all calculations. The effect of the line capacitance is to produce a current called charging current. This current will be in quadrate of the applied voltage. It flows through the line even if the receiving end is open-circuited. The charging current of the open circuit line is referred to as the amount of current flowing into the line from sending end to receiving end where there is no load. In many cases, the total charging current of the line is determined by multiplying the total admittance of the line by the receiving end of the voltage. This would be correct if the entire length of line has the same voltage as that of receiving end voltage. However this method of finding the charging current is sufficiently accurate for most lines. The actual value of the charging current will decrease uniformly from its maximum value at sending end to the minimum value at receiving end. Due to the charging current, there will be power loss in the line even the line is open circuited. 3.2-Surge Impedance Loading (sil pdf) As power flows along a transmission line, there is an electrical phase shift, which increases with distance and with power flow. As this phase shift increases, the system in which the line is embedded can become increasingly unstable during electrical disturbances. Typically, for very long lines, the power flow must be limited to what is commonly called the Surge Impedance Loading (SIL) of the line. (dr) or SIL is defined as the amount of power delivered by a lossless transmission line when terminated by a load resistance equal to surge or characteristics impedance. Surge Impedance Loading is equal to the product of the end bus voltages divided by the characteristic impedance of the line. Since the characteristic impedance of various HV and EHV lines is not dissimilar, the SIL depends approximately on the square of system voltage. A transmission line loaded to its surge impedance loading: (i) Has no net reactive power flow into or out of the line, and (ii) Will have approximately a flat voltage profile along its length. (dr) with load at the receiving end equal to SIL. Volts (3.1) It is clear from the equation that voltage magnitude at any point along the transmission line is constant with the magnitude equal to the receiving end voltage. Also, at SIL the general expression for current can be rewritten as . Amperes (3.2) Using (3.1) and (3.2), the complex power flowing at any point along the transmission line can be calculated as. (3.3) Hence, the amount of real power flowing along a lossless transmission line loaded at SIL is constant as expected. Also, noticed that the reactive power flowing in the line is zero. This point is crucial in understanding the phenomenon called Ferranti effect. When the line is terminated at SIL the net reactive power needed to deliver the real power by keeping the voltage constant is zero. In other words, the reactive power internally produced by shunt capacitance is just sufficient to fulfill reactive power required. However, when the loading conditions change from SIL or moderate loading to light load to heavy load, there will be imbalance in reactive power required to transmit the real power. In the absence of devices to control and compensate for reactive power, situation could result in lack or surplus of reactive power. Hence, create a low or high voltage profile, respectively in the receiving end of the transmission line. Typically, stability limits may determine the maximum allowable power flow on lines that are more than 160 km in length. For very long lines, the power flow limitation may be less than the SIL as shown in Table 0-1. Stability limits on power flow can be as low as 20% of the line thermal limit. Typical stability limits as a function of system voltage are given in table below: 3.3-The uncompensated line on open circuit: tjmiller The lossless line that is energized by the generators at the sending end and is open circuited at the receiving end is described by following equation with . 3.4 And 3.5 Voltage and current at the sending end can be given as 3.6 3.7 and are in phase, which is in consistent , with the fact that there is no power transfer. The phasor diagram shown in the figure. The voltage and current profiles in equation 1 and 2 are more conveniently expressed in terms of . 3.8 Phasor diagram of uncompensated line on open-circuit Voltage and current profile at no load condition. The general form of these profiles shown in fig 3.5 above. For a line 300km in the length at 50Hz, 3600 60 per 100km, so à °Ã‚ Ã…“ ½=6*3=180. Then and based on the SIL. The voltage rise on open circuit is called Ferranti Effect. Although the voltage rise of 5% seems small, the charging current is appreciable and in such a line it must all be supplied by the generator, which is forced to run at leading power factor, for which it must be underexcited. The reactive power absorption capability of a synchronous machine is limited for two main reasons The heating of the ends of the stator core increases during the under excited operation. The reduced field currents results in reduced internal emf of the machine and this weakens the stability. Note that a line for which à °Ã‚ Ã…“ ½=à °Ã‚ Ã¢â‚¬ ºÃ‚ ½Ãƒ °Ã‚ Ã¢â‚¬ ºÃ‚ ¼=à °Ã‚ Ã…“†¹/2 has a length of ÃŽÂ »/4 (one quarter length wavelength, i.e, 1500km at 50Hz) producing an infinite voltage rise. Operation of any line approaching this length is completely impractical without some means of compensation. In case of the sudden open-circuit of the line at the receiving end, the sending end voltage tends to rise immediately to open-circuit voltage of the sending end generators, which exceeds the terminal voltage by approximately the voltage drop due to the prior current flowing in their short circuit reactances. 3.4-Compensated transmission lines: Reactive power compensation means the application of reactive devices To produce a substantially flat voltage profile at all levels of power transmission. To improve stability by increasing the maximum transmissible power, and/or To supply the reactive power requirements in the most economical way. Ideally the compensation would modify the surge impedance by modifying the capacitive and/or inductive reactances of the line, so as to produce a virtual surge impedance loading that was always equal to the actual power being transmitted. Yet this is not sufficient to ensure the stability of the transmission, which depends also on the electrical line length. The electrical length can itself be modified by the compensation to have a virtual à °Ã‚ Ã…“ ½shorter than the uncompensated value, resulting in an increase in the steady state stability limit This consideration suggests two broad classification scheme, Surge impedance compensation and line length compensation. Line length compensation in particular is associated with series capacitors used in long distance transmission. Another compensation is called compensation by sectioning, which is achieved by connecting constant voltage compensators at intervals along the line. The maximum transmissible power is that of the weakest section but since this is necessarily shorter than the whole line, an increase in maximum power and , therefore , in stability can expected. 3.4.1-Passive and active compensators: Passive compensators include shunt reactors and capacitors and series capacitors. They modify the inductance and capacitance of the line. Apart from the switching, they are uncontrolled and incapable of continuous variation. For example, shunt reactors are used to compensate the line capacitance to limit voltage rise at the light load or no load condition. They increase the virtual surge impedance and reduce the virtual natural load Shunt capacitor may be used to augment the capacitance of the line under heavy loading. They generate reactive power which tend to boost the voltage. They reduce the virtual surge impedance and increase . Series capacitors are used for line length compensation. A measure of surge impedance compensation may be necessary in conjunction with series capacitors, and this may be provided by shunt reactors or by a dynamic compensator. Active compensators are usually shunt connected devices which have the property of tending to maintain a substantially constant voltage at their terminals. They do this by generating or absorbing precisely the required amount of corrective reactive power in response to any small variation of voltage at their point of connection. They are usually capable of continuous variation and rapid response. Active compensators may be applied either for surge impedance compensation or for compensation by sectioning. In compensation they are capable of all the functions performed by fixed shunt reactors and capacitors and have additional advantages of continuous variability with rapid response. Compensation by sectioning is fundamentally different in that it is possible only with active compensators, which must be capable of virtually immediate response to the smallest variation in power transmission or voltage. The table below summarizes the classification of the main type of compensators according to their usual functions. 3.4.2-Shunt compensation: Shunt reactors are used to limit the voltage rise at the light load or no load conditions. On long transmission they may be distributed at intermediate substations in shown in figure below voltage and current profile of shunt compensated system at no load. Consider the simple circuit above in figure, it has a single shunt reactor of reactance at the receiving end and a pure voltage source at the sending end. The receiving end voltage can be given as 3.9 3.10 Equation 7 shows that and are in phase, in keeping with the fact that the real power is zero. For receiving end voltage to be equal to sending end voltage , must be given by 3.11 The sending end current can be given as 3.12 using equation 3.9 and 3.11 3.13 Since , this means that the generator at the sending end behaves exactly like the shunt reactor at the receiving end in that both absorb the same amount of reactive which is evident from equation below. 3.14 Chapter 4 Ferrenti effect 4.1 Ferranti effect: A long transmission line draws a substantial quantity of charging current. If such a line is open circuited or very lightly loaded at the receiving end, the voltage at receiving end may become greater than voltage at sending end. This is known as Ferranti Effect and is due to the voltage drop across the line inductance (due to charging current) being in phase with the sending end voltages. Therefore both capacitance and inductance is responsible to produce this phenomenon. Another way of explaining Ferranti effect is based on net reactive power flow in the line. It is known that if the net reactive power generated in lie is more than the reactive power absorbed, the voltage at that point in the line becomes higher than the normal value and vice versa. The inductive reactance behaves like a sink in the line whereas the shunt capacitance generates the reactive power. If the line loading corresponds to the surge impedance loading, the voltage is same everywhere as reactive power absorbed in the line is equal to the reactive power generated. If the loading is less than SIL, generated power is more than generated power absorbed, therefore, the receiving end voltage is higher than sending end voltage. The capacitance (and charging current) is negligible in short line but significant in medium line and appreciable in long line. Therefore this phenomenon occurs in medium and long lines. Represent line by equivalent model. And the vector diagram can be given as OM = receiving end voltage Vr OC = Current drawn by capacitance = Ic MN = Resistance drop NP = Inductive reactance drop Therefore; OP = Sending end voltage at no load and is less than receiving end voltage (Vr) Since, resistance is small compared to reactance; resistance can be neglected in calculating Ferranti effect. From model, For open circuit, no load, There fore Or Or By neglecting resistance The quantity is constant in all line and is equal to velocity of propagation of electromagnetic waves (= 3 ÃÆ'- 102 km/sec) By substituting the values in the above derived equation And And finally From the above equation So or Receiving end voltage is greater than sending end voltage and this effect is called Ferranti Effect . 5.1, fig 4.10,4.6,4.4,4.2,4.1,3.5,3.4,2.1 Chapter 5 results and discussion Results and discussions: To simulate for my analysis, a radial system in the following figure was modeled as test system. Practical industrial data was acquired from Queensland Electric Commission which follows the Australian standard for conductors and enforces the transmission and distribution company to follow the standards. This acquisition was important to incorporate for more realistic analysis and observe the phenomenon as it is appeared in the real life transmission systems. Conductor types for the simulation were chosen from the provided list

Teaching Philosophy Statement Essay example -- Teacher Education Educa

Teaching Philosophy Statement Most teachers once they begin teaching rarely think about what philosophy they follow, or how they teach. It’s like second nature. A comparison can be drawn from the act of reading. One does not think about how they read, they just read. Teaching is the same. The teacher draws up lesson plans and such, being what they teach, but how to teach the lesson is usually not in the forefront of their thought, especially for experienced teachers. This just comes naturally. The underlying philosophy of how to teach is always present in the teacher’s method however transparent it may become to the teacher over years of instructing. How this process works is like spreading butter on a slice of bread. Philosophy is like the butter knife you use, it can be varied. A spoon, spatula, or even a finger could be used to spread the butter and they all get the job done, just in a different manner. However, the butter and the bread remain constant; they are the teaching materia l and students respectively. The vast majority of teachers do not choose to use one utensil exclusively, they instead use a knife sometimes, a spoon others, or even a finger at need. Most teachers follow a conglomerate of bits and pieces of all the philosophies. This is a very effective approach because all students can learn, regardless of their learning style. The teacher that combines all these methods into a single productive teaching style practices eclecticism. This is my philosophy of the classroom. I believe that all of the philosophies have distinct merits when applied correctly. Also I believe that certain students respond better to certain philosophies of teaching. Jim may disdain all material that he d... ...ehaviorism falls out of importance as the student grows. One major achievement that came from this philosophy is programmed learning. I own a CD-rom study guide for a class that follows the programmed learning study method and it has helped me tremendously on my learning. As a teacher, one must identify their own philosophy and learn how to best utilize it in the classroom. All philosophies are aimed at the best interest of the student. It is the task of the teacher to decide the method by which they wish to accomplish the education of their students. All teachers have to spread the butter on the bread; it is the choice to use the knife, spoon, spatula, or finger that determines our teaching potency. I will choose to use the tools that will spread the butter most evenly and efficiently, for the benefit of the bread, not just by mere favor of a utensil.

Factors Affecting Infant Feeding Practices of Mothers

A STUDY ON FACTORS AFFECTING INFANT FEEDING PRACTICES OF MOTHERS IN THE PHILIPPINESSantos, Samuel Edelson Pingol, Aaron Paul Villanueva, Lovely Ann Bermas, Mhelrick Andrew Brecia, Froyland Miguel Faustino, Donald Bulacan State University BSECE 2A Introduction Every day, as many as 4,000 infants and young children die worldwide because they are not breastfed. According to UNICEF (United Nations Children’s Fund), it is because their mothers are not empowered with adequate knowledge about breastfeeding and do not receive enough motivation and support. Babies, their mothers, their families, their community, their environment, even the economy of the country in which they live, all benefit from breastfeeding. This research is generally about breastfeeding: its benefits and significance to infant nutrition and factors that makes impact on breastfeeding; the practices in the Philippines that affect breastfeeding; and analyses by organizations concerned in breastfeeding. The given timeframe for the group research is the month of July and some weeks of August. The group decided to use a topic about health and wellness since nutrition is celebrated in that month. Another reason that encouraged pursuing the topic is that the world has celebrated its 20th Annual Breastfeeding Week last August 1-7, 2012 making the research timely. Abstract The objective of conducting this study is to evaluate the breast feeding practices adopted by women in the Philippines, and to show factors affecting time of initiation of breast feeding, age of weaning, and food given to the baby other than breast milk. It aimed to describe the elements affecting breastfeeding and to find out the significant relationship between breastfeeding and health of the child. The breast feeding practices adopted in terms of duration, frequency, exclusiveness of breast feeding and weaning have great impact on complete physical, mental and psycho-social development of the child. The superiority of breast milk compared to other types of milk for the nourishment of the human infant offering better health benefits. Early childhood is characterized by rapid growth, maturation of tissues and remodeling of organs. Breastfeeding is the optimal method for feeding infants. All the nutritional needs for most of these children are provided by breast milk in the right amounts and duration. Exclusive breast feeding was practiced by 40% of the mothers for first six month of life. The data obtained were analyzed using percentiles. Although the findings indicated that 34% of the mothers practiced breastfeeding and 84% supplemented with complementary foods, only 40% practiced exclusive breastfeeding. This study emphasizes the need of breast feeding education program regarding the duration of exclusive breast feeding. In comparison between rural and urban countries, studies have found out that mothers from rural areas have higher rates of breastfeeding than urban mothers. Another concept of the study is about the factors that affect breastfeeding patterns of mothers. These are demographic, socioeconomic and health service factors. Apart from breastfeeding, the research prior discussed about the loads of benefits people can get from breastfeeding and breast milk. There are psychological, health and contraceptive benefits one could get through breastfeeding and breast milk. To all infants, specifically Filipino children, should have the best protective ways against infection and malnutrition through exclusive breastfeeding. I. Breast milk: The most suitable food for human newborn A. Benefits of Breastfeeding 1. Emotional Health 2. Protective Action 3. Anti-infective properties of breast milk 4. Psychological profit 5. Effective contraception B. Formula Feeding II. Practices in the Philippines that contribute to problem of breastfeeding A. Duration (short) of breastfeeding in the Philippines B. Deprivation of beneficial effects of colostrum due to delayed breastfeeding III. Literature Review A. Breastfeeding and Supplementary Feeding 1. Breastfeeding in rural countries . Breastfeeding in developed countries B. WHO Recommendations 1. WHO Code (Definition of Terms) 2. DOH (Philippines) C. Factors Influencing duration of breastfeeding 1. Demographic Factors a. Mother’s age b. Parity c. Subsequent pregnancy d. Birth order of child e. Sex of the child f. Residence 2. Socioeconomic Factors a. Mother’s Education b. Mother’s Occupation c. Father’s Education d. Household economic statu s 3. Health Service Factors a. Antenatal care visits b. Place of delivery and mode of delivery c. Advice from health personnel 4. Conceptual Framework IV. Personal Overview and Conclusion Breast milk: The most suitable food for human newborn. The benefits of breastfeeding There are loads of benefits we can get from the natural way of giving food to babies. It can be emotional, physical, psychological and economical. Breastfeeding contribute to emotional health. Babies and mothers who gave birth recently are quite emotional persons. Being sensitive is a natural effect that occurs after giving birth and babies are still delicate up to the time they are still crying a lot. According to Gerber [1], â€Å"from birth up to 6 months of age and beyond, breast milk is still the best milk mother’s can give to their babies. The best nutrition they can give at the same time having these advantages: Preventing allergies and infections by providing natural immunities; Speeding up the recovery of the uterus; decreasing intestinal problems for babies; and promoting psychological and emotional insurance for both moms and babies. † Breastfeeding executes protective action. Breast milk can provide protective action to infants. These are immunities and colostrums. According to Cocabo and Kin [3], ‘through antibodies found in breast milk, mothers can ensure protection from immunization. Breastfeeding naturally promotes proper nutrition for the babies. ’ â€Å"Breast milk contains infection fighting antibodies from the mother, and breastfed babies are believed to be at a reduced risk for many acute and chromatic infections early in life. The cholesterol content is also high in human milk and very low in formulas. Cholesterol promotes brain growth and provides the building blocks of hormones, vitamin D and intestinal bite† [4 p. 2]. 1] Gerber, â€Å"Some notes on breastfeeding†, Countdown: Nine Months to a Perfect Delivery, vol. 1, no. 1, 2004, pp. 31 [3] S. Cocabo and P. Kin, â€Å"Childcare: the first 3 years†, Your Health Guide: The Family Wealth, Medimarketing, Inc. , Makati, Metro Manila, Philippines, 1994, pp. 26 [4] Medicine Net, Breastfeeding and formula feeding, Medicine Net, 1996, p. 2 [Online]. Availab le: http://www. medicinenet. com [Accessed: 18 July 2012] â€Å"Breast milk is best for your baby and the earlier he begins breastfeeding, the better. It has all the right nutrients at the right amounts. It costs nothing and helps you get back in shape. The first week after delivery, your breasts will produce colostrum – a thick, yellowish milk that is high in protein but very low in fat than actual breast milk. It also contains antibodies† [5 p. 23]. And according to Paraz [8], high-quality human capital may depend on mothers’ effort to breast feed their children. Health expenditures are lessened through breastfeeding, resulting to an organized health system. Breast milk contains anti-infective properties. Aside from immunity, breastfeeding has contents that can establish strong relationship between mother and child. Another one is that it can avoid pre- menopausal breast cancer. â€Å"If a multinational company develop a product that was a nutritionally balanced and delicious food, a wonder drug that both prevented and treated disease, cost almost nothing to produce and could be delivered in quantities controlled by the consumer’s needs, the very announcement of their find would send their shares rocketing to the top of the stock market. Women have been producing such miraculous substance, breast milk, since the beginning of human existence† [7 p. 1]. Breast milk gives psychological profit. Apart from emotions, the way mothers think, especially moms who gave birth on their first child, are vulnerable. They are experiencing adjustments on their lifestyle and even on their minds. The website Psychology today [2] says that, ‘the link between breastfeeding and anxiety decrease could serve as a source of sanity-preserver. The attention of nourishing of a child can appear remarkable in the best of situations. If a first-hand mother’s stress system where to boost in full-throttle every while the child cries or spits-up, motherhood can seem even more psychologically stimulating than it is. [2] PT Staff, â€Å"The benefits of breastfeeding†, Psychology Today, 01 January 1996 [Online]. Available: http://www. psychologytoday. com/articles/199601/the-benefits-breast-feeding [Accessed: 18 July 2012] [5] Wyeth, â€Å"Breast milk: The ideal first food†, Pampering Baby with Care: Your Baby Care Guide, Wyeth Nutrition, pp. 23, pp. 25 [7] The Quote Garden, â₠¬Å"Breastfeeding†, 1998, p. 1 [Online] Available: http://www. quotegarden. com/breastfeeding. html [Accessed: 18 July 2012] [8] Carisa Paraz, â€Å"Breastfeeding can cut infant deaths†, Medical Observer: Passing Problem, no. , August 2007, pp. 8 Breastfeeding is an effective contraceptive. Parents usually wait for a year or more before making another child. But they cannot get rid of having coital activities with one another hence, they do family planning and make use of contraceptives. One form of a natural contraceptive is breastfeeding. The simplest way of contraception is Lactational Amenorrhea Method. It doesn’t require counting or any contraceptive method. For it to be successful, Epigee [6] suggests that ‘breastfeeding should be ASAP (as soon as possible), frequent, uninterrupted and exclusive. ’ As your baby suckles, nerve impulses travel through your body and are received by your brain. This signal the production of a hormone called prolacti n, which works to inhibit both FsH (Follicle stimulating Hormone) and GnRH (Gonadotropin Releasing Hormone). As a result, ovulation does not occur and menstruation stops, making it almost possible to become pregnant’ [6]. Formula feeding There are cases that mothers are advised not to breastfeed. It could be a medical or a personal reason. However, there is an option for mothers that they can use if ever breast milk is not offered. Based on Wyeth Nutrition [5 p. 5], â€Å"prepared milk products are good replacement for breast milk. A paediatrician will suggest formulas that will suit for baby. These formulas have nutrients that are also found in breast milk. Conventional types of milk products are not advisable because it may lead to indigestion. Another thing is that those products have low iron content, not good aid curing IDA, and is lacking vitamin C, D and E. † Practices in the Philippines that contribute to problem of breastfeeding. Across East Asia, mothers are turning away from breastfeeding in huge numbers, regardless of the well-attested health risks to their babies. Filipino mothers are not mentally deficient but many are quite unsuspicious consumers and susceptible to the advance and sophisticated marketing techniques deployed by the milk powder companies. â€Å"Despite of the underlying beneficial effects of breastfeeding, both incidence and duration have been varying in most developing countries of the world, not the case in the Philippines. From 14. 5 months in 1963 – 67, the average duration of breast-feeding was declining to 12. 1 months during 1978 – 82. These decreasing rates drastically affect families having low income and inadequate child nutrition† [10]. Paraz [8] said, â€Å"Non-violation of the International Code of Marketing of Breast-Milk Substitutes adopted by WHO in 1981 will initiate sufficiency on breastfeeding recommendations among mothers and families. † Duration (short) of breastfeeding in the Philippines. During 1997, the Philippines demonstrated only 10 percent of infants that were never breastfed at birth. The proportion of â€Å"never breastfed infant† was comparatively higher in 1983, which has an increase of 10 percent in rural and 27 percent in urban areas. Breastfeeding discrepancies between urban and rural, marked 34 percent of never breastfed infants, were found in Manila [10]. Breastfeeding duration is short though it is widely exercised and culturally established in the Philippines. No more than 14 percent of mothers keep on breastfeeding up to 2 years. [8] Carisa Paraz, â€Å"Breastfeeding can cut infant deaths†, Medical Observer: Passing Problem, no. 7, August 2007, pp. 8 Deprivation of beneficial effects of colostrum due to delayed breastfeeding. Filipino women influenced by cultural norms and beliefs often think that colostrum is a dirty milk and should be eliminated. They delay breastfeeding several days after birth. Benefits of colostrum are consequently deprived. Practice of initiating supplements and non-nutritive liquids at an early age is a more serious problem. This supplementary feeding may contaminate diet for infants because of unfamiliar chemicals present in the food. It further reduces contraceptive effects for mothers. â€Å"Male infants in the Philippines are completely breastfed for a shorter duration compared to many Asian countries. Boys are supplemented, earlier than girls to meet the increasing necessities for growth. Increased diarrhoeal rates are caused mainly by this kind of supplementation among male infants. Moreover, boys receive more starchy staples while girls consume larger amount of green leafy vegetables. In effect, girls are much likely prone to malnutrition than boys. They have more serious eye damage from Vitamin A deficiency. †[10] All mentioned statements are considered as contributors to breastfeeding problems in the Philippines. For child survival, breastfeeding period should be given priority. For benefits of both mother and child, primary factors in feeding infants should be recognized. Many studies showed that breastfeeding manifests child health and well-being, including child survival and child spacing. Thus, it is important to know and to be updated about the current breastfeeding practices in the Philippines. Likewise, analysis of factors affecting short breastfeeding period should be dealt with. Literature Review In this section, the study made by experts regarding matters affecting breastfeeding and infant feeding will be assessed. It is expected that the data created by prior tests provide a framework for a review that follows. Breastfeeding and supplementary feeding WHO [9] states that, ‘babies must be completely breastfed for six months of age to attain the primary development and sufficient nutrition— important for lifetime wellness. ’ However, dietary necessities for infants are increasing as they grow, they should be also given complementary or supplementary foods but breastfeeding is still ongoing until two or more years. â€Å"As babies grow into young children, their nutritional needs change quickly. At around six months, breast milk alone is no longer sufficient to meet a baby’s energy and nutrition requirements. The baby is also at a stage of development where he/she can start to swallow non-liquid food. The introduction of appropriate and nutritious complementary food to babies from this age is extremely important as it plays a crucial role in the child’s physical and cognitive development†[13]. From about 6 months of age, breast milk alone is no longer sufficient to cover a baby’s nutritional requirements. He or she can also start to swallow non-liquid complementary foods at this stage, helping to support growth, brain development and the building of natural defenses. The period of weaning is critical for the future development and growth of infants. Breastfeeding in developed countries vs. developing (rural) countries. In urban countries, as Kyi [10] studied, duration of breastfeeding is reduced and supplemental foods are introduced early. It is because of [9] WHO, Exclusive breastfeeding, World Health Oraganization, 15 January 2011 [Online]. Available: http://www. who. int [Accesed: 19 July 2012] [13] Nestle, Breastfeeding and Complementary Feeding, Nestle, 2008. [Online] Available: http://www. babymilk. nestle. om/complementary-feeding [Accessed: 28 July 2012] the mothers’ occupation, which is conflicting with extended breastfeeding. Also, in these areas, availability of breast milk substitutes is sufficient making them to shift from breast to bottle feeding. On the other hand, in developing countries, breastfeeding is done until eight to twelve months due to unavailability of milk substitute and scarcity. Supplementary foods are deferre d causing malnutrition. Table 3. 1- Percentage (%) of children (2003-2008) who are: Country| exclusively breastfed| breastfeedingwith complementary feeding| till breastfed(extended)| | 0-5 months| 6-9 months| 12-15 months| 20-24 months| Afghanistan| -| 29| 92| 54| Bangladesh| 43| 74| 95| 91| Brazil| 40| 70| 50| 25| Cambodia| 60| 82| 90| 54| China| -| 32| 43| 15| Ethiopia| 49| 54| 94| 88| India| 46| 57| 88| 77| Indonesia| 32| 75| 80| 50| North Korea| 65| 31| 67| 37| Laos| 26| 70| 82| 48| Malaysia| 29| -| -| 12| Mexico| 38| 36| 32| 21| Myanmar| 15| 66| 85| 67| Pakistan| 37| 36| 79| 55| Philippines| 34| 58| 58| 34| Qatar| 12| 48| 32| 21| Saudi Arabia| 31| 60| 59| 30| Sri Lanka| 76| 86| 92| 83| Thailand| 5| 43| 32| 19| Turkey| 40| 71| 58| 26| United Arab Emirates| 34| 52| 50| 29| Vietnam| 17| 70| 78| 23| Zimbabwe| 22| 79| 87| 40| Above is a table containing statistics of children from selected developing countries who were breastfed, exclusively, with complementary foods and extended breastfeeding by UNICEF [16]. Countries Australia, France, Italy, Spain United Kingdom and United States were not included since they are [16] UNICEF, Statistics about breastfeeding, UNICEF, 2009. [PDF] Available: http://www. childinfo. org [Accessed: 28/ 7 /12] considered developed countries. Also Asian countries, also known as Four Asian Tigers or Asian Dragons, Hong Kong, Japan, Singapore and Taiwan, were excluded as they have graduated from being a developing country as declared by IMF (International Monetary Fund) [14] . Bangladesh and Ethiopia, countries from Asia and Africa respectively, and listed as least developed countries by the United Nations [14], has the higher percentage of breastfeeding rate compared to Malaysia and Thailand, considered the more developed countries, gaining lower rates with regards to the list. Breast feeding strengthens the economy by adding significantly to the national food supply. The economic value of mothers’ milk production is large, worth billions of dollars even in small countries. †[8 p. 8 para. 7] WHO Recommendations The World Health Organization (WHO) is the agency that supports and evaluates matters regarding nutrition, especially breastfeeding. Along with UNICEF (United Nations Children's Fund), powered by the Un ited Nations, their primary concern is child health and nutrition. For mothers to be able to start and maintain breastfeeding for six months, UNICEF and WHO [9] suggest that ‘breastfeeding should be initiated within the first hour of life, exclusive, on demand, and bottles or others should be avoided. WHO recommends mothers worldwide to exclusively breastfeed their infants for the child’s first six months to achieve optimal growth, development and health. Thereafter, they should be given nutritious complementary foods and continue breastfeeding up to the age of two years or beyond. ’ Globally less than forty-percent (40%) of infants fewer than six months of age are exclusively breasted. Adequate breast feeding support for children, mothers and families could save many young lives† [9]. [14] Wiki, Developing Countries, Wikipedia. org, 28 July 2012 [Online]. Available: http://en. wikipedia. org/wiki/Developing_country [Accessed: 29 July 2012] [8] Carisa Paraz, â€Å"Breastfeeding can cut infant deaths†, Medical Observe r: Passing Problem, no. 7, August 2007, pp. 8 [9] WHO, Exclusive breastfeeding, World Health Oraganization, 15 January 2011 [Online]. Available: http://www. who. int [Accesed: 19 July 2012] Definition of terms Based on WHO Code (International Code of Marketing of Breast milk Substitutes) Breast-milk substitute- means ‘any food being marketed or otherwise presented as a partial or total replacement for breast milk, whether or not suitable for that purpose [17 p. 8]’. Complementary food- means ‘any food whether manufactured or locally prepared, suitable as a complement to breast milk or to infant formula, when either become insufficient to satisfy the nutritional requirements of the infant. Such food is also commonly called weaning food or breast-milk supplement [17 p. 8]’. Infant formula- means a breast-milk substitute formulated industrially in accordance with applicable Codex Alimentarius standards, to satisfy the normal nutritional requirements of infants up to between four and six months of age, and adapted to their physiological characteristics [17 p. 9]’ . Exclusive Breastfeeding- as Kathy ; Sue [12] said, it means, ‘setting off other foods for the infant, including water, the breast milk is the only food to be in taken by the child’. The Philippines Department of Health (DOH). Aside from WHO, the Department of Health is the main institution that is imposing activities and information egarding health and nutrition for Filipino mothers and infants particularly in breastfeeding. â€Å"In response to the 1981 International Code of Marketing of Breast Milk Substitutes by the World Health Organization (WHO), the Philippines Department of Health strongly advocates breastfeeding for nursing mothers instead of using breast milk subst itutes. Republic Act 7600, known as The Rooming-In and Breastfeeding Act of 1992, provides incentives to all government and private health institutions in the Philippines that support rooming-in and breastfeeding. The Act provides that newborn infants with normal deliveries be put to the mother’s breast immediately after birth, and roomed-in within 30 minutes; infants delivered by caesarean section should be roomed-in and breastfed within 3 to 4 hours after delivery†[15]. [17] WHO and Nestle, International Code of Marketing of Breast-milk Substitutes, World Health Organization Geneva, 1981 [PDF] Available: http://www. babymilk. nestle. com/who-code-compliance and http://www. who. int [Accessed: 28 July 2012 12] Sue Ann Kendall and Kathy Dettwyler, Exclusive breastfeeding, Kathy Dettwyler, 3 August 1995. [Online] Available: http://www. kathydettwyler. org/detexclusive. html [Accessed: 25 July 2012] [15] NSO Manila and ICF Macro, Philippines: National Demographic and Health Survey 2008, National Statistics Office Manila, Philippines and ICF Macro Calverton, Maryland, USA, December 2009, Chapter 11. [EBook]. Available: Measure DHS, http://www. measuredhs. com/publications [Accessed: 29 July 2012] Factors Influencing duration of breastfeeding Demographic Factors Maternal age: Many researchers found that older women tend to breast feed longer. It is likely that older women have more experience in infant feeding than younger women. They may know the benefits of breast-feeding by their own experience and as a result, they are more likely to breastfeed longer. A study [10] found that older women are more likely to continue breast-feeding beyond 18 months than younger women in rural. Parity: Parity of mother has significant effect on breast-feeding duration, usually women with higher parity breastfeed their children for longer duration. It is most likely that women with higher parity are usually older, less educated and less likely to involve in formal employment sector. Also, women with many children are more likely to be from rural areas and follow the traditional lifestyles. Therefore, they can breastfeed longer, which is a common phenomenon in rural areas. However, studies [10] found out that it could be depending on the setting. They found out that the tradition is a key in the duration of breastfeeding when it comes to parity. Birth order of the child: Some researchers found the positive relationship between birth order of the child and duration of breast-feeding. The higher the birth order of the child is, the longer is the duration of breast-feeding. It is because children of higher birth order are more likely to be borne by older mothers, who are less likely to engage in employment sector and can breastfeed them longer. Another reason may be that these mothers may have older children who help them in household work, so they have more time to breastfeed their babies. This is the common pattern in many societies. Sex of the child: It is one of the important factors influencing duration of breast-feeding. In some countries, male children are breastfed for longer period than female children due to son preference by cultural or religious reason. It is a common phenomenon in China, some South Asian countries and also in some Arab countries. A study [10] says that, in China of 4,084 ever-married women under age 50 in Shaanxi found that male children are breastfed longer than female children. On the other hand, reverse phenomenon is seen in some countries. Male children are fully breastfed for a shorter period than female children in the Philippines. Mothers supplement boys earlier to meet their increasing needs for growth than to girls or because of sex preferences that favor the provision of supplements to boys rather than to girls. Subsequent pregnancy: Researchers found the association between duration of breast-feeding and subsequent pregnancy of mothers. Generally, mothers discontinue breast-feeding as soon as they know that they are pregnant. It is because of a common belief that breast milk of pregnant women can rot and cause disease in the child. Similar pattern is found out based on the study [10] in Cebu, Philippines. Strongest determinant of breast-feeding duration is the mother’s perception of being pregnant. Most women who become pregnant while lactating stop breast-feeding before the end of the first trimester because they often say that pregnancy is associated with â€Å"sour milk†. Residence: Many researchers found that duration of breast-feeding varies markedly between urban and rural mothers. Although there is no exact reason why rural women breastfeed more and longer duration than urban women, some suggested that changing lifestyles in urban areas are not compatible with breastfeeding. This finding was supported by Kyi [10], that in the Philippines, during the period 1973-88, women who breastfed shortest duration lived in Manila City. This common phenomenon is the result of urbanization and changing social system in many parts of the world. Usually, family members can encourage women to breastfeed especially in extended families. Such families are more prevalent in rural areas. It is one of the reasons why rural women breastfeed more and longer than urban women. Along with modernization, women become more educated and take part in employment sector, which is usually incompatible with prolonged duration of breast-feeding. Moreover, utilization of modern maternity care services is common among educated women especially in urban areas, which less encourage women to breast feed for long period. These factors together with other factors contribute to marked difference in the duration of breast-feeding according to urban-rural differential. Socioeconomic Factors Mother’s Education: Effect of maternal education on duration of breastfeeding varies in different societies. Along with modernization, well-educated women tend to breastfeed for a shorter period especially in urban areas. It may be that as women become more educated, they are more likely to involve in formal employment, which is not compatible for longer duration of breast-feeding. However, the reverse pattern is seen in some developed countries since well educated women are more likely to breastfeed their babies and for a longer period. The possible explanation is that as women become more educated they become more aware of advantages of breast-feeding and thus they breastfeed their babies longer. A research [10] done in the Philippines found that women with higher education are more likely to breastfeed for a short time. The result is based on a study of 2,622 mothers in both urban and rural communities of Cebu City. Also, that highly educated mothers from families with highest income or asset categories are least likely to breastfeed and they do so for a short period. Mother’s Occupation: The work status of women causes a major difference in the duration of breast-feeding since it requires leaving the infant at home during working hours. Therefore, duration of breast-feeding is shorter among working mothers. In addition, type and pattern of job of mothers also influence the duration of breast-feeding in different societies. Location of work or distance of work from home, type of work, the other alternative available for child care and the income derived from the work all seem to be important. For mothers who work as suggested by WHO [9], time and place are the key things that affect the duration of breastfeeding. There is a necessity of time and place for them to continue breastfeeding. However, solutions like maternity leave, part-time work arrangements, breastfeeding breaks, etc. can help them going on with breastfeeding. Father’s Education: Like other factors, father’s education can also affect duration of breast-feeding. Usually, well- educated men can get a good job and as a result, they can earn sufficient income. Also, better-educated man tends to marry better-educated women. If both of them are employed, they can earn more income for the family. As their income increases, they can purchase household items such as refrigerator, gas or kerosene stove, which favors the use of breast milk substitutes. As such, it will lead to shorter duration of breast-feeding. Father’s education may also have positive effect on breastfeeding. It is because as fathers are well educated, they have more access to the messages from the health sector or from the mass media. As they understand the benefits of breastfeeding, they will encourage their spouses to breastfeed longer. The research [10] found out that there is an inverse relationship between father’s education and duration of breast feeding. Longer duration of breastfeeding is seen among children whose fathers are with no schooling or less schooling. Household Economic Status: In countries like Bangladesh, Mexico, Philippines and Vietnam, the relationship between household economic status and breastfeeding is inversed. Upper class babies are less likely to be breastfed than those of others [10]. [10] Aye Kyi Kyi, Factors Affecting Breastfeeding in the Philippines: An Analysis of 1998 NDHS Data, M. A. Thesis, Faculty of Graduate Studies, Mahindol University, Myanmar, 2000. [9] WHO, Exclusive breastfeeding, World Health Oraganization, 15 January 2011 [Online]. Available: http://www. who. int [Accesed: 19 July 2012] Health Service Factors In most developing countries, lower rates of breastfeeding and shorter duration are associated with health care services. ‘Breastfeeding rates are decreasing because health services are not receiving the support they need. [8 p. 8]’ Ante natal Care Visits: During these periods, the attitudes and beliefs of the health professionals influence the women’s own knowledge and attitude towards breastfeeding. The more the pregnant women visit her ob-gyne, the more knowledge she can receive. It will lead to successful initiation of breastfeeding and continuation for the period advised by the health personnel. Place and mode of delivery: Utilization of health care services has an important effect on duration of breastfeeding. Practice of health workers at different health facilities can influence the women’s decision to breastfeed. On the other hand, the form of delivery can affect the duration of breastfeeding. Ireland [11] said that in normal delivery, women are more likely to breastfeed than those of via caesarean section. Healing process or the condition of the baby could be the two main factors given that women cannot choose their mode of delivery. Advice from health personnel: Duration of breastfeeding also depends on whether the woman receive advice on breastfeeding from health worker or not. In the Philippines, as researched by Kyi [10], there is no statistically significant effect of breastfeeding promotional messages on the intention and duration of breastfeeding. Conceptual Framework The underlying concept of this study is that duration of breast-feeding can be affected by demographic, socioeconomic and health service factors. Among many demographic factors; age of mother, parity, subsequent pregnancy, sex of child, birth order of child and residence (urban / rural) are assumed as important factors influencing duration of breast-feeding. Out of many socioeconomic factors, mother’s education, occupation, father’s education and economic level of household are regarded as major [8] Carisa Paraz, â€Å"Breastfeeding can cut infant deaths†, Medical Observer: Passing Problem, no. 7, August 2007, pp. 8 [11] Jae Ireland, Factors affecting breastfeeding mothers, Livestrong, 15 July 2011. [Online]. Available: http://www. ivestrong. com/article/493114-factors-affecting-breastfeeing-mothers [Accessed: 18 July 2012] [10] Aye Kyi Kyi, Factors Affecting Breastfeeding in the Philippines: An Analysis of 1998 NDHS Data, M. A. Thesis, Faculty of Graduate Studies, Mahindol University, Myanmar, 2000. determinants of duration of breast-feeding. Among various health service factors, 3 factors are considered important for duration of breast-feeding. There are number of antenatal care visits, place and mode of delivery and whether the woman had received an advice on breast-feeding during the post-partum period or not. This conceptual framework is presented in the figure below. Independent VariablesCategoryDependent Variable Mother’s Age Parity Subsequent Pregnancy Birth Order of the Child Demographic Factor Sex of the Child Residence Mother’s Occupation Duration of Breastfeeding Mother’s Education Father’s Education Socioeconomic Factor Household Economic Status Ante natal Care Visits Place and Mode of Delivery Health Service Factor Advice from Health Worker Fig. 3. 1- Conceptual Framework: Factors Influencing Duration of Breastfeeding The most valuable thing mothers can give their babies during early years is the milk obtained from breastfeeding. This means of feeding infants is the earliest known form. It is widely used since the first human had existed. Until the present time, breastfeeding continues to promote many useful effects for people in diverged societies. â€Å"Breast milk is the most suitable food for human newborn and the safest way of feeding infants for the first four to six months of life†[8]. According to studies, it gives perfect nutrition for babies and builds the foundation for their healthy psychosocial progress. Human milk is the milk made specifically for human infants. It is always natural as it is. Because of this exceptional reason, benefit earners involve not only the infants but as well their mothers, their families, their community, their environment and even the economy in which they live The researchers observed several studies that revealed many advantages of breastfeeding. It is recognized as the best nutrient for infants; natural contraceptive for mothers for about 6 months post-partum; preventive action for mothers against breast and ovarian cancers and provision of bonding between mother and child. Breastfeeding is not just a matter of supplying better milk. Of course, the increased opportunity for parent-child bonding offered by breastfeeding is a widely known benefit of nursing. One of the most important advantages of breastfeeding is that the mother is present. This is nature's plan for keeping mother and child close, providing the connection and reassurance the child needs so profoundly. Breastfeeding, beyond all of its many physical benefits, has the built-in bonus of requiring the mother's close presence. In addition to its nutritive value, breast milk also has protective action against common infections. The milk secreted called â€Å"colostrums† contains anti-infective property which can prevent the newborn from diarrhea and pneumonia. If babies are probably prevented from those diseases, they will have a stronger immune system. The protective action of breast milk is very important for the child wellness. In the Philippines, to be particular, warm weather affects the spread rate of bacteria. As a result, infants may be largely exposed to common infections. Malnutrition plays a huge role in child mortality because the immune systems of these children are less resistant to common childhood diseases. This is why a common cold or bout of diarrhea can kill a malnourished child. By simply ensuring exclusive breast feeding for infants, malnutrition is somehow addressed. Aside from its direct effects on the health and well-being of babies, breast feeding has a profound impact on the economy. It strengthens the economy by adding significantly to the national food supply. The economic value of mothers’ milk production is large, worth billions of dollars even in small countries like Philippines. It also reduces future burdens on the health system. Exclusive breast feeding is giving infants is giving infants with only breast milk until 4 to 6 months of age. It greatly matters since it is attributed with almost complete protection against cholera and diarrhea. The World Health Organization (WHO) has recommended that all infants should be exclusively breastfed and begin to receive supplementary foods between fourth to sixth months. This means that feeding infants is not just to breastfeed them. It is to give them the proper nutrition through â€Å"exclusive breastfeeding†. With the right duration and process, organized health system is assured. Both â€Å"too short† and â€Å"too long† duration of breast feeding is not appropriate for child nutrition. The Philippines showed short duration of breast feeding cases according to the researchers’ study. Despite of the beneficial effects derived from breast feeding, both incidence and duration have been changing. This is a serious problem. When mothers shortly breastfeed, their babies tends to receive limited infection-fighting antibodies. Beneficial effects of colostrum are likewise deprived. It is necessary for mothers to know what contributes to problem of breast feeding practices in the Philippines. Because of traditions and customs in the Philippines, a belief passed over generations is often conceptualized. Filipino women believe that colostrum should be discarded because it is dirty milk. This common misconception about the colostrum must be rejected. In this case, mothers must also learn the current breast feeding practices to be informed and updated. Support for breast feeding must go beyond the hospital, and involve communities, work-places, local governments, workers’ unions, mass organizations and consumer associations, in addition to the already very acute nongovernment organizations. Mother’s effort is worth the health of their children. Health services should have support coming from the government. Breastfeeding period depends on whether the woman receives counseling on breast feeding from health workers or not. A health worker may influence a lot of mothers and encourage them to breastfeed exclusively. However in the Philippines, there is no significant effect of breast feeding promotional messages on the purpose and period of breast feeding. Furthermore, mothers breastfeed their babies for a dramatically shorter period if they were told to feed formula. As infant-formula sales increase, the number of breastfeeding mothers goes down. Local infant- formula companies spend billions of dollars a year to endorse their products. This is in contrast to poorly funded public health systems that fail to provide health workers with the skills and knowledge needed to promote breast feeding. Filipino mothers must be wise consumers and be aware of the marketing techniques to be considered on buying milk powder formulas. For wide application, the researchers found that breast feeding can be a solution to the rapid growth of population in the country. If mothers fully breastfeed longer than the old tradition, there is a delay for next pregnancy eve if she does not use any contraceptive method. Breastfeeding can be an instant and effective contraception. Considering all benefits offered by breast feeding, the group concluded that all infants, specifically Filipino children, should undergo exclusive breast feeding. References [1] Gerber, â€Å"Some notes on breastfeeding†, Countdown: Nine Months to a Perfect Delivery, 2004, vol. 1, no. 1, pp. 31 [2] PT Staff, The Benefits of Breastfeeding, Psychology Today, 01 January 1996 [Online]. Available: http://www. psychologytoday. com/articles/199601/the-benefits-breast-feeding [Accessed: 18 July 2012] [3] S. Cocabo and P. Kin, â€Å"Childcare: the first 3 years†, Your Health Guide: The Family Wealth, Medimarketing, Inc. , Makati, Metro Manila, Philippines, 1994, pp. 26 [4] Medicine Net, Breastfeeding and formula feeding, Medicine Net, 1996, p. 2 [Online]. Available: http://www. medicinenet. com [Accessed: 18 July 2012] [5] Wyeth, â€Å"Breast milk: The Ideal First Food†, Pampering Baby with Care: Your Baby Care Guide, Wyeth Nutrition, pp. 23, pp. 25 6] Epigee,ContraceptiveBenefitsofBreastfeeding,Epigee,2012. [Online]. Available: http://www. epigee. org/fetal/contraception. html [Accessed: 19 July 2012] [7] The Quote Garden, Breastfeeding, 1998, p. 1 [Online] Available: http://www. quotegarden. com/breastfeeding. html [Accessed: 18 July 2012] [8] Carisa Paraz, â€Å"Breastfeeding can cut infant deaths†, Medical Observer: Passing Problem, no. 7, Augus t 2007, pp. 8 [9] WHO, Exclusive breastfeeding, World Health Oraganization, 15 January 2011 [Online]. Available: http://www. who. nt [Accesed: 19 July 2012] [10] Aye Kyi Kyi, Factors Affecting Breastfeeding in the Philippines: An Analysis of 1998 NDHS Data, M. A. Thesis, Faculty of Graduate Studies, Mahindol University, Myanmar, 2000. [11] Jae Ireland, Factors affecting breastfeeding mothers, Livestrong, 15 July 2011. [Online]. Available:http://www. livestrong. com/article/493114-factors-affecting-breastfeeing- mothers [Accessed: 18 July 2012] [12] Sue Ann Kendall and Kathy Dettwyler, Exclusive breastfeeding, Kathy Dettwyler, 3 August 1995. [Online] Available: http://www. kathydettwyler. org/detexclusive. tml [Accessed: 25 July 2012] [13] Nestle, Breastfeeding and Complementary Feeding, Nestle, 2008. [Online] Available: http://www. babymilk. nestle. com/complementary-feeding [Accessed: 28 July 2012] [14] Wiki,DevelopingCountries,Wikipedia. org,28July2012[Online] Available: http://en . wikipedia. org/wiki/Developing_country [Accessed: 29 July 2012] [15] NSO Manila and ICF Macro, Philippines: National Demographic and Health Survey 2008, National Statistics Office Manila, Philippines and ICF Macro Calverton, Maryland, USA, December 2009, Chapter 11. EBook]. Available: Measure DHS, http://www. measuredhs. com/publications [Accessed: 29 July 2012] [16] UNICEF, Statistics about breastfeeding, UNICEF, 2009. [PDF] Available: UNICEF, http://www. childinfo. org [Accessed: 28 July 2012] [17] WHO and Nestle, International Code of Marketing of Breast-milk Substitutes, World Health Organization Geneva, 1981 [PDF] Available:http://www. babymilk. nestle. com and http://www. who. int [Accessed: 28 July 2012]

Obesity speech

Overweight and obesity cause the development of diabetes, and contribute to high blood pressure, Infertility, birth complications and amplify asthma and a poor health status. This Is very serious and It has to be taken way more serious by the people living here. Obesity Is largely preventable through changes In lifestyle, especially diet or daily exercise. There are many diseases that are so hard to cure, so why is it that, when we actually have a disease that you can cure yourself, we don't do anything about it?By some changes in your lifestyles, you could actually get a lot healthier than you were before. I am not saying that it is easy. I know that it can be hard to turn things around especially if it's become a habit to eat unhealthy and by eating unhealthy you don't get energy, and that is also a reason why many don't exercise as much as they should do. Younger people have largely grown up in a world, where a greater variety of food than ever before has become available and at a relatively low cost, and so are more prone to develop obesity at a younger age.Obesity is a major cause of death and 1 out of 3 adults and 1 out of 6 children is obese. Obesity costs the US, almost 150 million dollars a year, where almost 10 % of he national medical budgets. The way you eat has changed over the last 50 years. A lot more food is available than before and opportunities for physical activities are lacking. It is a known fact that physical activity improves overall health. Not only does it improve circulation, increase blood flow to the brain, and raise endorphin levels, which all helps to reduce stress, improve mood and attitude, and calm children.Physically active students also achieve more in school, they are less likely to miss school and participate more in class. Michelle Obama speaks about obesity In her beech and tells that because of the support of huge American businesses, Like Disney and Walter etc. Now more than half a million In undeserved communities now have the access to fresh, healthy food. Military leaders are serving healthier menus and products. Nearly two and a half million kids have enrolled In recreational sport classes.And they launched Let's Move Active schools, an unprecedented effort to Invest more than $70 million to promote actively and bring physical education back to your schools. So something Is done, yes. But could more be done? Walt for audience response I think – yes! Guys! I know that I may not Influence you to do something about It, but I may as well try, because this is serious. After I told you all these consequences, it must do outside the restaurant is looking so tasty and the candy in the candy stores can be so tempting, and its okay to eat it once in a while, but it can't be an everyday food or an everyday habit.That's Just too unhealthy for your body and health. I know that it tastes so good when you're eating it, but how do you feel about yourself when you finished the meal? Do you feel good or do you feel insecure about your body? Wait for audience response I can tell you, that I sure don't feel especially good after an unhealthy meal like that. So you got to ask yourself – Is this worth it? Do I want to be healthy? Do I want to be fit? Do I want to look good?I'm not saying that it's wrong to have curves, it isn't at all. But it's wrong, when it's dangerous for your own life. You are the young generation. You can still do something about this and with one step at a time it will help. Even if it's baby steps, you still got to try. I know that after an exhausting day at school it is very tempting to lie down in the bed and watch television, go on your ‘phone and hat with your friends on backbone, go on Mainstream and post a picture, whatever you like to do.