จำนวน Repository ( 3447 )

การวิเคราะห์หาปริมาณโปรตีน แร่ธาตุและวิตามินในข้าวพันธุ์พื้นเมืองของจังหวัดเลย
การวิเคราะห์หาปริมาณโปรตีน แร่ธาตุและวิตามินในข้าวพันธุ์พื้นเมืองของจังหวัดเลย

The aim of this research was to study protein mineral and vitamin contents in 20 local rice varieties by collecting 36 samples from loei province. Determination of nutritional value of 36 samples showed that it consisted of 7.16±0.15-11.05±0.12 g protein/100 g rice. Khao Niaw Dum Luempua (LR22) showed the highest phosphorus content were 263.85±0.19 mg/100 g. Analysis the amount of iron and calcium by flame atomic absorption spectrophotometry (FAAS). Found that the concentration of iron was the highest content in Khao Homtung (LR7) were 7.31±0.14 mg/100 g And calcium content highest in Khao Niaw Dum Luempua (LR22) as 11.15±0.24 mg/100g. In the analysis of all three vitamins by high performance liquid chromatography (HPLC). khao Sum Bine (HP14) showed the highest beta carotene content were 0.08±0.14 mg/kg. While not detecting beta carotene in local rice varieties 15 samples including Khao Plah Sew Noi detecting beta carotene in local rice varieties 15 samples including Khao Plah Noi (LR3) Khao Hom Sa Ngiem (LR6) Khao San Pa Tong (LR12) Khao San Pa Tongdor (LR13) Khao Soviet (LR15) Khao San Ti Bal (LR16) Khao Lom Pee (LR17) Khao Laotaek (LR19) Khao Plah Sew Noi (LR20) Khao Hom Sa Ngiem (LR27) Khao Homtung (LR28) Khao Phare (LR30) Khao Maw (LR31) Khao Dang (LR32) and Khao Plah Sew Noi (LR35). The results showed that the highest alpha tocopherol and thiamine contents were found in khao Niaw Dum Luempua (LR36) with 16.18±0.09 and 12.08±0.18 mg/kg respectively. The results of this study are useful as basic data for rice consumption local rice preservation and further product development.

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การศึกษาหาเปอร์เซ็นต์การหดตัวของพลาสติก อะคริโลไตรล์บิวทาไออีนสไตรีน โดยยึดตามาตรฐาน ASTM D955 standard test method
การศึกษาหาเปอร์เซ็นต์การหดตัวของพลาสติก อะคริโลไตรล์บิวทาไออีนสไตรีน โดยยึดตามาตรฐาน ASTM D955 standard test method

The shrinkage of plastic was caused by the shape of the product and the type of plastic used in the injection. The plastic shrinkage difference was resulted from the temperature used in melting the injection speed mold cooling and different injection surroundings. These led to unknown exact value of plastic shrinkage and the trial and error work has been done. As a result of trial and error work the injection products were not in the determined size. This research aims to find the percentage of plastic shrinkage according to standard test ASTM D955 from (Amorphous Thermoplastic) (Acrylonitrile Butadiene Styrene ABS). The findings showed that square specimen size 60x60x2 mm measured from vertical perpendicular to flowing direction the shrinkage was at 0.86% the shrinkage was at 0.59% when measured from flowing direction and the thickness expanded at 20%. For the rectangular specimen size 12.7x127x3.2 mm measured from vertical perpendicular to flowing direction the expanding was at 0.16% the shrinkage was at 0.88% when measured from flowing direction and the thickness expanded at 14.86%. The circular specimen size 100x3.2 mm the shrinkage was at 1.26 when measured from vertical perpendicular to flowing direction the shrinkage measured from flowing direction was at 0.82% and the thickness expanded at 13.23%

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เปรียบเทียบประสิทธิภาพการส่งกำลังไฟฟ้าระหว่างหม้อแปลงแกนอากาศและหม้อแปลงแกนเหล็กของวงจรขยายกำลังคลาสอี
เปรียบเทียบประสิทธิภาพการส่งกำลังไฟฟ้าระหว่างหม้อแปลงแกนอากาศและหม้อแปลงแกนเหล็กของวงจรขยายกำลังคลาสอี

This paper presents the simulation and experimental result of class-E power amplifier. It is often used in designing a high frequency ac power source because its ability to perform the conversion efficiently even at high frequencies with significant reduction of switching losses. This paper aims to compare the transmission performance of electrical power between the air core transformer and iron core transformer which the identical input voltage of 50 VAC. Both transformers are designed to step voltage up (step up transformer) ratio of 1:4.5. The Arduino microcontroller Arduino was used to generate a pulse width modulation (PWM) with operating frequency of 3.74 kHz. IC gate drive TC4422 was used to drive the IRF510 MOSFET. Based on the simulation and experimental results the power loss in air core transformer is 75 percent while power loss in iron core transformer is 0.2 percent. The maximum distance that can transmit electric power of air core transformer is 9.3 centimeters.

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ศึกษาตัวแปรที่มีผลต่อท่อความร้อนที่ติดตั้งวัสดุพรุนชนิดตาข่าย
ศึกษาตัวแปรที่มีผลต่อท่อความร้อนที่ติดตั้งวัสดุพรุนชนิดตาข่าย

This research aims to study the parameters have affected the pipe which was studied the heat transfer characteristics of a heat pipe with a mesh wick. The heat pipe made from copper tubes with intemal (ID) as 10 and 12 mm and length of 30 cm which was installed a copper mesh wick inside a tube. Three working fluids are distilled water ethanol and refrigerants-11 (R-11). The filling ratios is 50% with respect to evaporator volume. The operating temperature at the evaporator section is: 50 70 and 90 oC. The condenser section has cooked by water with a flow rate of 0.5 L/min. Then all of the experimental data were compared with the heat pipe without copper mesh wick. It was found that heat pipe at ID 12 mm yielded a better heat transfer rate when compared with heat pipe without a mesh wick. The heat pipe produced a heat transfer rate value of 7.3 W and heat pipe efficiency of 58.5 at evaporator section’s temperature of 90oC. In addition the mesh wicks will help transfer the working fluid in the condenser section return to the evaporator section. The condensed liquid had spread around the walls of the heat pipe. The working fluid was condensed to the evaporator section then affected to a higher heat transfer rate.

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กรอบแนวคิดรูปแบบความสัมพันธ์เชิงสาเหตุของปัจจัยที่ส่งผลต่อการพัฒนาองค์กรปกครองส่วนท้องถิ่นสู่การเป็นองค์การที่มีขีดสมรรถนะสูงในประเทศไทย
กรอบแนวคิดรูปแบบความสัมพันธ์เชิงสาเหตุของปัจจัยที่ส่งผลต่อการพัฒนาองค์กรปกครองส่วนท้องถิ่นสู่การเป็นองค์การที่มีขีดสมรรถนะสูงในประเทศไทย

This article aims at reviewing literature and supposing the hypotheses that present a conceptual framework of a causal relationship model of factors influencing the development of local administrative organizations into high performance organizations in Thailand. From the literature reviews some important points to be tested were found as follows: 1. The compositions of local administrative organizations development into high performance organizations consisted of 6 factors: 1) Total Management Quality; 2) Openness and Action Orientation; 3) Long-term Orientation; 4) Local Innovation Continuous Improvement and Renewal; 5) Quality of Human Resource Management System and 6) Readiness for Change of local Personnel. 2. The causal relationship model of factors influencing the development of local administrative organizations into high performance organizations are as follows: 1) Transformational leadership has a positive direct effect on high performance local administrative organizations; 2) Organizational culture has a positive direct effect on high performance local administrative organizations; 3) Organizational structure and design have a positive direct effect on high performance local administrative organizations and 4) Transformational leadership has a positive indirect effect on high performance local administrative organizations through organizational culture and organizational structure and design. This framework can be used to study and test against empirical data.

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