To store electrical power from solar cells are generally used battery as storage. Recent development in capacitor technology achieves with higher capacitancc smaller and low cost especially dcvelopment of a supcr capacitor (doublc laycrs). This research study used a super capacitor to store electrical power from solar cells. The results show that super and electrolyte capacitor can be used without battery with more power density and fast charge. But capacitor discharging must be controlled. The important disadvantage is super capacitor is used with low voltage and high rate of charge leakage. In case of electrolytic capacitor can use with higher voltage low rate of charge leakage but lower capacitance.

The aim of this study was to examine an effect of self-control on self-discipline of student at Rajamangala University of Technology Phra Nakhon. Study participants were first year business administration students from 5 different classes during 2009 academic year (N = 194) with 51 males and 143 females. During the 7- week experiment students were asked to remind and report themselves regarding their behavior during Monday Wednesday and Friday. Data from questionnaire developed by researcher with r = 0.79 were analyzed with frequency percentages and means of percentages and reported as follow: 1) Student discipline behavior tended to change significantly after 7 weeks of experiment. 2) Six most behaviors occurred during the experiment were follow instructor’s suggestions and guidelines (96.9%) full class attendance and thinking of other rather than themselves (96.5%) instructor expectations (95.9%) being in classes in time (93.5%) and class attention and commitment (92.0%) respectively. On the opposite six least behaviors occurred during 7 weeks experiment are polite conversation (70.1%) using crossover bridge (79.8%) learning and understanding in classes and polite manner (82.2%) proper dress (86.7%) showing respect to parents before leaving and returning their houses (90.8%).

The purposes of this study were: 1. to study the inventory control system of S. Siriseang Company Limited 2. to study the causes and problems of differences between the real practical work and the company manual 3. to solve the problem of its inventory control system. The questionnaires were collected from 19 subjects relating to the inventory control system including purchasing storingaccounting and sales departments .The results showed that S. Siriseang Company Limited has 4 steps of the inventory control system consisting of Order. Products Return and Pickup. The problems of the inventory control system of S. Siriseang Company Limited are as follows; a lack of inventory data lack of purchasing planning and procurement a defective product categories issues out lack of staff and neglecting to perform the work according to the work manual. The solutions of the problems were 1. sheet items (Stock card) 2. the theory of ABC Analysis 3. the theory EOQ and 4. the process of inventory control system. The effective inventory control system should have the good management system and effective product categories for easy storage and use.

Current energy from sun made a significant contribution in the electricity manufacturing industry in Thailand. However the potential application of solar energy are at the low level. The agency will need to make solar energy perpendicular to the sun as much as possible. Therefore the invention of the light experimental set for two-axis motion to identify the vertical axis was done to compare the value of Light Dependent Resistor to locate the origin of the light and can be applied to the real work in the future.

The objectives of this research were to find the distribution of food demand for laying hens and to find the optimum amount of that food production which had minimum cost. The data consisted of customer purchase orders for the food of laying hens price of food for laying hens cost per unit for the food inventory cost related to food of laying hens in which the food was out of stock such as fine overtime urgent purchase for material. They were collected in 2008-2009 form a factory in Nakhonratchasima province. The collected data were analized in order to explore the distribution of the monthly food demand for the laying hens and to see the rate of inventory per unit. The results were used in the stochastic linear programming model for aggregate planning in which the optimum production minimum cost could be obtained. Programming algorithm in MATLAB and tools in Linprog software were used to get the solution. The distribution of the food demand for laying hens and the random numbers were used in the model. The study found that the distribution of food demand for laying hens every month has normal distribution (January to December). The monthly average amount of production from January to December were 10936.94 12913.74 11898.12 13096 15443.26 14916.33 10322.64 10818.21 11393.11 11700.72 9706.05 and 11702.05 respectively. The minimum total cost average for 12months was Baht 62422386.98.