จำนวน Repository ( 291 )
ศักยภาพด้านอาหารของพืชท้องถิ่น ชุมชนแพรกหนามแดง อำเภออัมพวา จังหวัดสมุทรสงครามเพื่อความมั่นคงทางอาหารและการใช้ประโยชน์ จากความหลากหลายทางชีวภาพอย่างยั่งยืน
The Potential of food crops in the Phraek Nam Daeng community Amphawa Samut Songkhram province for food security and sustainable use of biodiversity Local plants were tested phytochemical composition antioxidant activity antimicrobial activity and nutritional analysis. The results showed that phytochemical composition of local plants most of the cardiac glycosides tannins and antraquinones. Acanthus is the highest antioxidant activity Kloe and Hnampugda respectively. Antimicrobial activity of both Gram-positive bacteria. Gram- negative bacteria and yeast is very low.The nutritional value is the maximum on each side The amount of water is Phak Protein is Acanthus Fat is Hnampugda fiber is Kloe and carbohydrate is Hnampugda.
การทำนายค่าความหนาของชิ้นงานพาราโบลิกที่เกิดจากความไม่แน่นอนของคุณสมบัติโลหะแผ่นด้วยสมการการถดถอย
This research aims to predict the thickness loss of parabolic forming by using hydromechanical deep drawing (HMD) process. The methodology used is the finite element method on the uncertainty of the mechanical properties for 1 mm thickness SPCC sheet metals. The properties consisted of three aspects: strength coefficient (K) strain hardening exponent (n-value) and plastic strain ratio for all three axis (r0 r45 and r90). Multiple simulations were completed by randomly selecting K n r0 r45 and r90 values following the distribution obtained from the uniaxial tensile test. The results would be analyzed by using the regression equation to create the equation to predict the thickness loss of the test pieces obtained from the formation process using the K n r0 r45 and r90 variables without the use of finite element method. This would results in a decrease in the simulation time. Based on 30 experiments of uniaxial tensile test it shows that the sheet metal properties are normally distributed. After that 60 cases of the five variables were randomly selected to simulate the formation by using the finite element method. Finally the results obtained from the aforementioned simulation is analyzed and generated into a regression equation. From the comparison between the value predicted from the regression equation and the result obtained from the formation process it can be seen that the regression equation can effectively predict the thickness loss when the five variables are under the same distribution properties. However the efficiency will decrease when the values of the five variables are beyond the distribution properties obtained from the experiment. In addition the uncertainty of mechanical properties of sheet metal in the simulation displays the chances of discovering test pieces with over 40% thickness loss. The simulation resulted in 5 damaged test pieces accounting for 8.33% of the total process.
การเปรียบเทียบค่าความสัมพันธ์ระหว่างความเค้นและความเครียดที่ได้จากการทดสอบแบบเป่าโป่งด้วย น้ำกับการทดสอบแบบแรงดึงแกนเดียวของสแตนเลส SS304
The purpose of this research is to find the relation between stress and strain called as the Flow Stress Curve for 0.4 mm thickness stainless steel (SS 304). Two main methods are used: the Uniaxial tensile test and the Hydraulic Bulge Test (HBT). The relation between stress and strain from both methods would then be compared and simulated into cubic-shaped models by using Finite Element method. Results show that sheet metal formation simulated by using the flow stress curve obtained from Hydraulic bulge test can have the height of up to 40 millimeters before the work piece starts to lacerate. On the other hand if the flow stress curve obtained from Uniaxial tensile test is used the work piece will only be able to form about 15 millimeters before lacerating. The preliminary summary for this research can be said that the analysis for Hydraulic bulge test gives better results than Uniaxial tensile test as it has similar conditions to the actual formation process.
การพัฒนาผลิตภัณฑ์ดอกไม้ประดิษฐ์จากผ้าขาวม้าเชิงสร้างสรรค์
The reserch development of artifitial flowers creative made from Pa-kao-ma cloth consists of two objective. 1) To study satisfaction of the target group. Finding 1. Development process of artifitial flowers made from Pa-kao-ma cloth can be done with asking 5 expertion in to topics. The first topic mass flowers appearance. It can divide to five types. Monochl any dous. Mass flowers was made from litly. Alternative multilamination mass flowers was made from rose. Inflorescence flowers mass flower was made from Gladiolus. Composite flowers was made from hippeastrum johnsonil busy. Come-shaped mass flowers was from calla lily. The sec topic is filler flower. It can divide to two appearance. The First is sam flowers. It was made from Bouqainvillea. The second is orchid. It was made from Cattlega. 2. Satis faction to artificial flowers product from target amount 50 people in three forms following. Flowers vasc is the most satis faction with average equal to 4.89. Flowers frome 3D have average equal to 3.97. Accessories has average equal to 3.70
การอนุรักษ์พลังงานด้วยอุปกรณ์ปรับความเร็วรอบของมอเตอร์ในระบบมอเตอร์สูบถ่ายน้ำมัน
This thesis aims to study the optimization of the supply fuel system of pipeline by improving the pumps system from use pump size 1850 kW (2 pupms) and use only control valve. We design new system by use pump size 1850 kW (2 pumps) with variable speed motors (VSD). In this way we can control stability of opening and closing of the valve at 100% and use adjusting of the frequency of VSD as follow typing of fuel. To analysing of efficiency system we will use fuel 4 type that have different coefficient of density are JET A1 Disel B91 and B95. And then we compared the relationship between the quantity of each fuel per time and usage of power for the old system and new design that we found the new design as analyze the result and as follow the theory of Affinity Law have the value of efficacy more than. And it also can save energy cost to 52.13%