จำนวน Repository ( 1174 )

การพัฒนาโปรแกรมคำนวณสายส่งสัญญาณตามประเภทการใช้งานและความถี่
การพัฒนาโปรแกรมคำนวณสายส่งสัญญาณตามประเภทการใช้งานและความถี่

The objectives of this research were to develop of transmission line calculation program based on usage and frequency consisting of the two-wire transmission line twisted pair transmission line and coaxial transmission line. The program was developed in the form of graphical user interface in Malta. The developing and testing results found that the program was correctly capable to calculate capacity conductance inductance resistance and impedance for each transmission line usage and frequency. The results from the program with black box testing by five experts and twenty system users found the average and the standard deviation of results form computer experts were 4.04 and 0.36 respectively while those of results form the system users were 3.88 and 0.48 respectively. Conclusion it showed that the efficiency of the calculation program was a high level and can be used as a teaching and learning as well.

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การพัฒนาผลิตภัณฑ์สินค้าที่ระลึกจากผ้าด้วยเทคโนโลยีตกแต่งกลิ่นสำหรับกลุ่มอาชีพ สหกรณ์ศิลปะประดิษฐ์ จังหวัดนนทบุรี
การพัฒนาผลิตภัณฑ์สินค้าที่ระลึกจากผ้าด้วยเทคโนโลยีตกแต่งกลิ่นสำหรับกลุ่มอาชีพ สหกรณ์ศิลปะประดิษฐ์ จังหวัดนนทบุรี

This study explored batik cotton coated by stabilizing substance made of three kinds of plant and animal including gum arabic powdered gelatin and carboxymethyl cellulose or CMC at a ratio of 15 grams of stabilizer per 3300 ml. of water. The stickiness was tested using the electron microscope SEMScaning able to be 1000 times enlarged and Shirley Stiffness Tester was used to test for the stiffness to measure the bending length of the fabric. It was found that the gelatin from animals could coat the surface the best. The fabric bending length demonstrated the average warp yarn of 4.78 cm and weft yarn of 4.92 cm. Subsequently the fragrance was added with 25 ml of micro-capsules and bound with 10 ml binder per 1000 ml water. After leaving that for one day and 30 days the amount of microcapsules attached to the fabric was investigated. It was found that the microcapsules of powdered gelatin stack on the batik cotton the most followed by gum arabic and carboxymethyl cellulose or CMC respectively. The fabric bending length of warp yarn was 5 .8 2 and weft yarn was 4 .7 0 . Concerning the washing endurance for one two or three times itสถาบันอุดมศึกษา was found that the microcapsules stack on batik cotton coated by powdered gelatin the most followed by gum arabic and carboxymethyl cellulose or CMC respectively. Therefore the batik coated with powdered gelatin was considered suitable for the production of flowered garlands and flower crafts as special occasion gifts. Also the knowledge could be transferred to the professional arts cooperative groups in Nonthaburi. The results of the training were satisfying revealing the average satisfaction towards officers’ service at 4.87 speakers or trainers at 4.87 procedures at 4 .8 0 facilities at 4 .8 6 benefits at 4 .82 and average satisfaction in the overall at 4 .9 3 . The participants were highly satisfied at 98.00% and 100.00% for the application.

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ผลิตภัณฑ์ผลไม้แปรรูปจากมะม่วงหาวมะนาวโห่ : ชุมชนตำบลบางนกแขวก อำเภอบางคนที จังหวัดสมุทรสงคราม
ผลิตภัณฑ์ผลไม้แปรรูปจากมะม่วงหาวมะนาวโห่ : ชุมชนตำบลบางนกแขวก อำเภอบางคนที จังหวัดสมุทรสงคราม

The purpose of the study of processed fruit products from Karonda : Bang Nok Kwaek parish communities Bang Khonthi Samut Songkhram Province is to study the proper quantity of the Koranda fruit in the product the quality in the product’s process and the consumers’ acceptance (Consumer Test) in the product. The processed products are Karonda fruit jelly instant pasteurized Karonda fruit juice with extra fiber Karonda fruit sorbet Karonda fruit yoghurt ice-cream and concentrated juice (sauce) for drink mixing. The product has been tested by Randomized Complete Block Design (RCBD) method. The process was consisted with offering a tasting and evaluated in color scent taste matter and overall satisfaction by giving 9 point Hedonic scale from 70 consumers. And has been compared the difference of average means at 95% trustiness by Duncan’s New Multiple Range Test (DMRT) by an instant statistical analysis software. The result information is as the followings; The physical properties indicates of Karonda fruit the total acidity of 2.30 with the pH and the color was found that the brightness (L *) of 16.52 fee (a *) equal to 8.95 and (b. *) equals 5.37. The study of the chemical quality of Karonda fruit amount of energy in calories carbohydrates 73.2 percent 18.3 percent protein 1.57 percent 1.32 percent humidity fats fiber 83.7 percent ash 4.26 percent and 0.75 Vitamin C is found. The duration of ripening fruit yawning lemon booed affect the vitamin C in the fruit of the mango yawning lemon booed the oil will have more vitamin C than ripe to t 2 so I scratched the reduction of vitamin C may. Is due to be deployed as a compound to breathe. And led to the synthesis of new carbon structures during ripening. Karonda fruit jelly. The most acceptances level for Karonda fruit juice in the product is at 1:6 for its best flexibility. Since the juice concentration affects the jelly as it lowers the matter (flexibility). Too much of acid in Karonda fruit juice is able to unstabilize jelly matter. From the study of Pectin quantity the consumer has the most acceptance at the level of 10 grams which is the best recipe that keeps the good jelly matter (flexibility) stabilized. The physical properties indicates that there are the level of color hue at 5R color brightness at Value 4 Chroma at 14 sweetness at 35 Brix and pH at 3.05. The study of the chemical quality of Karonda fruit jelly in each 100 grams provides 120 kilocalories of energy 69.60 grams of humidity 0.11 gram of fat 29.80 grams of carbohydrate 0.41 gram of fiber 0.50 gram of ash and 0.45 gram of acidity. The consumer satisfaction is at 97.30 percent. Instant pasteurized Karonda fruit juice with extra fiber. The acceptance is at 100 percent of replacing Okra fruit juice by Karonda fruit juice. The acceptance study shows that the most proper fiber quantity adding to Karonda fruit juice is at 15 percent. The acceptance study shows that the most proper Pectin quantity affecting coconut jelly spreading is at 3 percent. The analysis results of the physical properties indicate that instant pasteurized Karonda fruit juice with extra fiber has color hue level at 5R value at 4 and Chroma at 12 which rendered the product to dark red. Also the pH level is at 3.29 sweetness is at 17 Brix firness g force 1 is at 11.29 g Viscosityag.sec AREA F-T 1:2 is at 339.507 ag.sec. The study of the chemical quality of Karonda fruit juice in each 100 grams provides 63.3 kilocalories of energy 83.9 grams of humidity 0.01 gram of fat 0.10 gram of protein 15.8 grams of carbohydrate 0.41 gram of fiber 0.24 gram of ash and 0.18 gram of pH balance. The consumer satisfaction to instant pasteurized Karonda fruit juice with extra fiber is at 98.66 percent. Karonda fruit sorbet. The most proper quantity of Karonda fruit juice is at 30 percent. The physical properties of Karonda fruit sorbet contain the brightness level at L*34.32 red color level at a*41.26 yellow color level at b*21.18 meltable solid quantity at 30*Brix and pH balance at 2.40. The study of the chemical quality of Karonda fruit sorbet in each 100 grams provides 91.8 kilocalories of energy 77.1 grams of humidity 0.15 gram of fat <0.20 gram of protein 22.6 grams of carbohydrate 0.11 gram of fiber and 0.12 gram of ash. The consumer satisfaction to Karonda fruit sorbet is at 100 percent. Karonda fruit yoghurt ice-cream. The most proper quantity of Karonda fruit added in the yoghurt ice-cream is at 10 percent of the whole ingredient. The consumers’ acceptance has been given the most for its scent taste matter (smoothness) and overall satisfaction which has the average mean at 7.24 7.77 7.17 and 7.67 consequently. The physical properties of Karonda fruit yoghurt ice-cream contain the viscosity level at 364.798 cps. color hue at 10P Value at 8/6 Chroma at N9/.5 overrun statistics at 4.55 and Karonda fruit yoghurt ice-cream melting rate at 89.90. The chemical quality of Karonda fruit yoghurt ice-cream in each 100 grams provides 214 kilocalories of energy 64.0 grams of humidity 14.6 gram of fat 3.14 gram of protein 17.5 grams of carbohydrate 0.76 gram of fiber 0.74 gram of ash and 5.67 pH balance. The consumer satisfaction to Karonda fruit yoghurt ice-cream is at 100 percent. Concentrated juice (sauce) for drink mixing. The most acceptance recipe is the strawberry sauce recipe number 1 with the replacement of Karonda fruit at 80 percent. The physical properties contain the viscosity level at 9.28 cps sweetness at 21 Brix color hue at 5R Value at 2 and Chroma at 4. The chemical quality of concentrated juice (sauce) for drink mixing in each 100 grams provides 91.1 kilocalories of energy 77.2 grams of humidity 0.30 gram of fat 0.1 gram of protein 22.3 grams of carbohydrate 0.76 gram of fiber 0.4 gram of vitamin C and 0.56 of pH balance. The consumer satisfaction concentrated juice (sauce) for drink mixing is at the maximum satisfaction at 92.0 percent as the concentrated juice (sauce) emphasizes the better taste of smoothie drink mixing and easy to consume. Keyword: jelly Karonda fruit instant fruit juice fiber sorbet ice-cream yoghurt concentrated sauce mixed drink

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การควบคุมความถี่ -โหลด ของการเชื่อมต่อระบบการผลิตไฟฟ้าจากโซล่าร์ฟาร์มและกังหันลม
การควบคุมความถี่ -โหลด ของการเชื่อมต่อระบบการผลิตไฟฟ้าจากโซล่าร์ฟาร์มและกังหันลม

The effects of load frequency control (LFC) of interconnected distribution power system in tie-line substation area load –frequency stability and the frequency respond at distribution generator (DG) are very important for interconnected control power system of tie-line area. The generating power system of solar farm and wind turbine which have interconnected distribution power system in tie-line substation area were tested using 3 simulation parameters: non-controller Automatic Voltage Regulator (AVR) and with Pl Controller. The results showed that there were 3 types of load and frequency changing in the interconnected area: load changed 0.02 p.u. had frequency of load changed 0.025 Hz and large disturbance. Comparisons of load-frequency to respond for steady state the time respond was 7.9 seconds for non-controller 5.4 seconds for AVR and 1.7 seconds for under controlled system at 0.1 p.u using Pl controller. Therefore the Pl controller has better efficiency than non-controller about 31 % and AVR about 16%. It can be concluded that the interconnected distribution power system in tie-line substation area controlling for storage for connected grid had better efficiency and optimization of generating power from renewable solar farm and wind turbine which have interconnected distribution power system in the nearby are balance of controlling of the original system.

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การศึกษาเชิงทดลองการเพิ่มประสิทธิภาพแผงเซลล์แสงอาทิตย์โดยใช้ท่อความร้อนแบบแบน
การศึกษาเชิงทดลองการเพิ่มประสิทธิภาพแผงเซลล์แสงอาทิตย์โดยใช้ท่อความร้อนแบบแบน

The purpose of this research was to improve the efficiency of solar cell modules by cooling with heat pipes. The test set consisted of three 80 watt solar modules that were made of mono-crystalline. The first module did not install heat pipes while the second module installed heat pipes using ethanol as the working fluid and the third module installed heat pipes using R-11 as working fluid. Solar radiation intensity electrical energy produced by the solar modules and temperature of the solar modules were recorded. The results showed that the average temperature of the first solar cell module was 52.9oC and the case of not install heat pipes on module. For the units with heat pipes it was found that unit with ethanol heat pipe had an average temperature of 50.7oC and efficiency at 10.2% whereas the unit using R-11 heat pipe had an average temperature at 49.2oC and efficiency at 11.8% From the experiments it was concluded that the installation of heat pipes could increase the efficiency of solar cell mokules.

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