http://repository.rmutp.ac.th:80/handle/123456789/86 2013-05-19T16:03:00Z 2013-05-19T16:03:00Z Waiyawut, Wanapun http://repository.rmutp.ac.th:80/handle/123456789/1069 2013-02-26T14:57:34Z 2012-08-30T00:00:00Z

Title: A designed object tracked by mobile robot using image processing Authors: Waiyawut, Wanapun Abstract: In present, there are widely use robot in many fields. Mobile robot can help us in several task, such as moving to toxic area, risk area or explosion area, mine. Movement control can be used in many ways. This paper proposed mobile robot that movc by wheels. It move to previous defined picture. By using small camera process an images and check it that is the previous one by using neural network. If it is, robot will move toward to that picture. The movement is in flat plane. If that defined picture is not in center, robot will move to left or right depend on its position until it is on center. This paper proposed image processing only. Description: รายงานการวิจัย -- มหาวิทยาลัยเทคโนโลยีราชมงคลพระนคร, 2551

2012-08-30T00:00:00Z Waiyawut, Wanapun http://repository.rmutp.ac.th:80/handle/123456789/1068 2013-02-27T03:25:05Z 2012-08-30T00:00:00Z

Title: Control system to store electricity from solar cells using super-capacitors controlled by embedded system Authors: Waiyawut, Wanapun Abstract: 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. Description: รายงานการวิจัย -- มหาวิทยาลัยเทคโนโลยีราชมงคลพระนคร, 2554

2012-08-30T00:00:00Z Rukzon, Sumrerng ngoenphrom, Niroj Nicomrat, Duongruitai http://repository.rmutp.ac.th:80/handle/123456789/1067 2013-02-27T03:33:35Z 2012-08-30T00:00:00Z

Title: Research on green plastering materials Authors: Rukzon, Sumrerng; ngoenphrom, Niroj; Nicomrat, Duongruitai Abstract: This research studies the potential for using waste ash from industrial and agricultural by-products as a plastering material. This paper presents a study of the water requirement, compressive strength, flexural strength, normal consistency, setting time, and air content of plastering material containing classified fly ash (FA) and ground rice husk ash (RHA). Fine fly ash and fine rice husk ash have a high potential to be used as a good pozzolanic material. The use of finer pozzolan results in a stronger and denser mortar which is due to better Q!spersion and filling effect as well as an increase in the pozzolanic reaction. Fine fly ash and fine rice husk ash can be incorporated into mortar as replacement of the mortar mix cement for the plastering. Mortar mix cement containing 20% fine fly ash and fine rice husk ash can be used to make plastering materials. Description: รายงานการวิจัย -- มหาวิทยาลัยเทคโนโลยีราชมงคลพระนคร, 2554

2012-08-30T00:00:00Z Wongsisa, Saharat Pokterng, Singkaew Chomsamut, Kompun Pangpecb, Prasit http://repository.rmutp.ac.th:80/handle/123456789/1066 2013-02-27T03:30:47Z 2012-08-30T00:00:00Z

Title: Development of recycling technology of WC Powder product for Sustainable in Industry Authors: Wongsisa, Saharat; Pokterng, Singkaew; Chomsamut, Kompun; Pangpecb, Prasit Abstract: This study is meant to help develops better facilities for Tungsten Carbide powder production process. The 10 kg-capacity machine used was able to produce 85 -95.49 percent purity Tungsten carbide powder. When measured, most of the particle sizes and distribution between 0.03-350.00 !lm. which are considered large sized. More than that, those tungsten carbide particles are contaminated by other kinds of metal especially Cobalt binder. We have tried to improve the Tungsten Carbide manufacturing processes by combining more steps including ball milling, drying and screening. After 24-hours ball milling process, the result showed that we were able to produce smaller Tungsten Carbide paliicles sizing from 0.025 to 30.00 ~lm. The obtained particles are also rounder and with 99.50 percent purity. They are also easier to grade. The Tungsten Carbide manufacturing technology yet needs a further development to eventually produce the desired hard material. Description: รายงานการวิจัย -- มหาวิทยาลัยเทคโนโลยีราชมงคลพระนคร, 2554

2012-08-30T00:00:00Z Paengteerasukkamai, Plangwath http://repository.rmutp.ac.th:80/handle/123456789/1065 2013-02-27T03:31:33Z 2012-08-30T00:00:00Z

Title: Hydro generator Authors: Paengteerasukkamai, Plangwath Abstract: Research this project invents for design and build the water turbine produce the electricity, by set up the equipment produces the electric current from water energy flows from the nature , which , be new choice for Thailand in using energy pays back. then born the idea in energy water lead flows in the tide comes to use is born the advantage The water turbine has produced the electricity that does designing and establish to compose 3 part importance, be , the part of water buoy, water turbine part is the pin wheel that is made of the iron I each have a draught 30-40 centimeter group part carries round which compose the gearwheel yes carry round and a transmitting belt carry round . From pin wheel test produces the electric current that establishes to induce float in a river already record seek feeling numb fire effiCiency reaches to open the stump makes straight for to share 5 the ampere , water speed flows to share 12 the meter / minute I the speed round the pin wheel turns to share 4 rpm. and tend that increase, follow the speed of the water that increases. Description: รายงานการวิจัย -- มหาวิทยาลัยเทคโนโลยีราชมงคลพระนคร, 2554

2012-08-30T00:00:00Z อนันต์, เต็มเปี่ยม วรวิทย์, วรนาวิน ทรงวุฒิ, มงคลเลิศมณี http://repository.rmutp.ac.th:80/handle/123456789/999 2013-02-27T03:34:29Z 2012-05-03T00:00:00Z

Title: Soy flour grinder disc and roller type machine Authors: อนันต์, เต็มเปี่ยม; วรวิทย์, วรนาวิน; ทรงวุฒิ, มงคลเลิศมณี Abstract: Soybeans are a crop that can be utilized, especially in terms of food rich in protein and fat as the human and animal needs. For using the soybeans must be processed to obtain the desired physical characteristics. The process is mostly a grinding and extraction. However, these two processes are completely different applications. This research aims to study and create the soybeans grinder machine become to flour, the quantity of grinding, the variable that affect to the amount of grinding and economic analysis for guiding to investment. The researchers have designed the grinder unit by the coarse grinding and mill grinding unit. For the coarse grinding unit is similar to a disc and in case of grinding mill will be used the roller set. Base on the power train of bolt grinding unit, the electric motor with 2 HP. at 1,450 RPM are used for the experiment. For the grinding mil process, the rough material is feed into grinding mil chamber for reduce the size of material become to the flour. The results of the research found that the suitable speed of the coarse grinding and mill grinding unit was 480 and 725 RPM respectively. In case of these relationships, the average quantity of grinding for the coarse grinding and mill grinding unit was 271.8 and 150 kglhr respectively. Furthermore, the results of experiment discover the materials that are not accounted of the coarse grinding for 13.9 percent. For the economic analysis for guiding to investment found that the breakeven point and pay-back period was 110,378 kg and 0.0067 year respectively. Description: รายงานการวิจัย -- มหาวิทยาลัยเทคโนโลยีราชมงคลพระนคร, 2554

2012-05-03T00:00:00Z Wongsisa, Saharat Pokterng, Singkaew Chomsamut, Kompun ประสิทธิ์, แพงเพชร http://repository.rmutp.ac.th:80/handle/123456789/989 2013-02-27T03:32:31Z 2012-05-02T00:00:00Z

Title: Product development of tungsten carbide scraps Authors: Wongsisa, Saharat; Pokterng, Singkaew; Chomsamut, Kompun; ประสิทธิ์, แพงเพชร Abstract: This research is to study the approach for producing the hard materials part by using tungsten carbide powder. The tungsten carbide powder derived from Tungsten scraps recycle processes which are Insert tools scraps, the waste of metal removal process, or derived from usage of machining on machine tools which are the production of metal powder by recovering cemented carbide to tungsten carbide powder and bring it to recycle. The first experiment of this research starts with the production of pure tungsten carbide powder in order to produce the hard metal part how to possibly produce the durable part or hard materials. Preparing tungsten carbide powder which pulverized and mixed with Cobalt co-binder less than 17%, so that molding with the pressure 300 Mpa and sintering at 1430 degree Celsius to the cemented carbide part in Insert tools type, rectangle, SNMG standard 120408 for turning. The result is found that the Insert tools have hardness about 1,385 HV and density 13.45 g/cm3 and then, they are tested to machine specimens in AISI 1045 type. The developed Insert tools can be machining metal removal them as well as the imported Insert tools. It is concluded that the production of Insert tools by recycling of tungsten carbide is qualified as the imported Insert tools. In addition, it is the new developed research in Thailand to be the approach for domestic cutting tools product instead of the imported cutting tools. Description: รายงานการวิจัย -- มหาวิทยาลัยเทคโนโลยีราชมงคลพระนคร, 2552

2012-05-02T00:00:00Z Puangcharoenchai, Somjin http://repository.rmutp.ac.th:80/handle/123456789/987 2013-02-27T03:36:44Z 2012-05-02T00:00:00Z

Title: Using condensate water to reduce heat for finned-tube condenser of air conditioning system. Authors: Puangcharoenchai, Somjin Abstract: Now a day the mostly air condition are use vapor compression refrigeration system in which R-22 refrigerant is used as a working substance. From the results of study, it found that the quantity of water vapor or moisture in the air is condensed with in the fan coil unit while through out the evaporator. The fluid after condense is called condensed water. By this process, the quantity of condensed water is increases when the air condition is used in the long time. To increase the utility, the condensed water is recovered for the heart reduction in the finned-tube condenser. Description: รายงานการวิจัย -- มหาวิทยาลัยเทคโนโลยีราชมงคลพระนคร, 2550

2012-05-02T00:00:00Z Lakkam, Supachai Suwantaroj, Kullayot Suphirat, Chawanee Rujasiri, Piyatida http://repository.rmutp.ac.th:80/handle/123456789/984 2013-02-27T03:24:35Z 2012-05-02T00:00:00Z

Title: Coefficient of friction testing Authors: Lakkam, Supachai; Suwantaroj, Kullayot; Suphirat, Chawanee; Rujasiri, Piyatida Abstract: Nowadays, the Thailand automotive industry widely grows. Brake'pad is one of the automotive productions that role to automotive industry because it is the most critical security parts. Consequently, testing products for quality are extremely requested. However, the equipment and function tests are not enough and are also high cost so it cannot supports to the automotive industry development. In this work, the initiation and design of frictional test were carried out. The testing procedure is referred to The special test jigs for friction measurements JIS K7125[5] and Clutch facings for automobiles JIS D4311[6].A study of the frictional test emphasize on the static friction(l-ls) and kinetic friction(l-lk) in different condition. There are 3 specimens of brake pad supported by the industry company. These specimens were test and compared between the pin on disk's result and the friction testing's result. The two-sided results from the analysis correspond but the pin on disk's friction coefficient is more than the friction testing's friction coefficient by 19.56%. Moreover, the coefficient of friction tends to follow the temperature. Besides, the static friction(l-ls) is likely more than kinetic friction(l-lk) and will be high difference in high pressure condition. Description: รายงานการวิจัย -- มหาวิทยาลัยเทคโนโลยีราชมงคลพระนคร, 2554

2012-05-02T00:00:00Z Kankaew, Prasong http://repository.rmutp.ac.th:80/handle/123456789/971 2013-02-27T03:35:59Z 2012-05-01T00:00:00Z

Title: Test melt flow index spiral test standard ASTM : D 3123-94 Authors: Kankaew, Prasong Abstract: This research aims to Test Melt Flow Index Spiral Test according to Standard ASTM : D 3123-94. To compare with this Standard the Melt Flow Index Spiral Test of HDPE, PP and ABS which determined by the manufacturer was tested in various sizes. The test and the results were as follow: Description: รายงานการวิจัย -- มหาวิทยาลัยเทคโนโลยีราชมงคลพระนคร, 2554

2012-05-01T00:00:00Z จุรีพร, แสนสิ่ง ดวงตา, ลัคณาพาชื่นกุล ทิพรดา, มุ่งดี จตุรงค์, จตุรเชิดชัยสกุล http://repository.rmutp.ac.th:80/handle/123456789/967 2013-02-27T02:42:26Z 2012-04-30T00:00:00Z

Title: ปัญหาความต้องการของนักศึกษาที่มีต่อการจัดการศึกษาของคณะวิศวกรรมศาสตร์ มหาวิทยาเทคโนโลยีราชมงคลพระนคร Authors: จุรีพร, แสนสิ่ง; ดวงตา, ลัคณาพาชื่นกุล; ทิพรดา, มุ่งดี; จตุรงค์, จตุรเชิดชัยสกุล Abstract: ปัจจุบันการเปลี่ยนแปลงของสังคมและความเจริญก้าวหน้าทางเทคโนโลยีมากขึ้น มหาวิทยาลัยเทคโนโลยีราชมงคลพระนคร คณะวิศวกรรมศาสตร์ ซึ่งเป็นสถาบันอุดมศึกษาด้านวิชาชีพและเทคโนโลยี จึงดำเนินการศึกษาปัญหาและความต้องการของนักศึกษาที่มีต่อการจัดการศึกษาของคณะ เพื่อใช้เป็นแนวทางในการปรับปรุงและพัฒนาการเรียนการสอนและสิ่งอำนวยความสะดวกต่างๆ ในการจัดการศึกษาให้มีคุณภาพยิ่งขึ้น และเป็นไปตามความต้องการของผู้เรียนโดยใช้กลุ่มตัวอย่างในการวิจัยได้แก่นักศึกษาคณะวิศวกรรมศาสตร์ ระดับปริญญาตรีปีการศึกษา 2551 จำนวน 450 คน จำแนกเป็นนึกษาชั้นปีที่ 1 จำนวน 167 คน ชั้นปีที่ 2 จำนวน 121 คน ชั้นปีที่ 3 จำนวน 75 คน ชั้นปีที่ 4 จำนวน 87 คน โดยแจกแบบสอบถามจำนวน 450 ชุด และได้รับแบบสอบถามคืนในฉบับสมบูรณ์ จำนวน 450 ชุด คิดเป็นร้อยเปอร์เซ็นต์ของจำนวนผู้ตอบแบบสอบถามทั้งหมด ค่าคะแนนเฉลี่ยวิเคราะห์ข้อมูลโดยใช้โปรแกรมคอมพิวเตอร์สำเร็จรูป SPSS การแจกแจงความถี่และร้อยละ ส่วนเบี่ยงเบนมาตรฐาน (S.D.) การทดสอบค่ามี (t-test) Description: รายงานการวิจัย—มหาวิทยาลัยเทคโนโลยีราชมงคลพระนคร คณะวิศวกรรมศาสตร์, 2552

2012-04-30T00:00:00Z Boonmee, Polrat Voranawin, Vorawit Mongkonlerdmanee, Songwut http://repository.rmutp.ac.th:80/handle/123456789/874 2013-02-27T03:34:02Z 2011-08-29T06:44:50Z

Title: Robusta coffee bean separator machine Authors: Boonmee, Polrat; Voranawin, Vorawit; Mongkonlerdmanee, Songwut Abstract: In the procedure processes of Robusta coffee initial from bring the green coffee after dried and removed the outside shell and bring it to separating process. The sale price depends on the size of green coffee. If their size of still standard, the sale price have been increased. Most of the separating process is majorly with the labor experience. Based on human experience, the error with operating and working time is increased. In this reason, we will study to the criteria of Robusta coffee for designing and creating the Robusta coffee bean separator machine for Robusta size standard testing. The separator machine consists of the three-layer cylindrical sieve set and the diameter of the layers was 4, 6 and 7.5 mm. respectively. For the standardization of Robusta coffee bean is controlled by size of hole sieve. In this research considers to 4 importance parameters by the efficiency of sorting out, standard of green coffee, Specific Energy Consumption [SEC] and assessment way economic engineering. The result of research shows that the maximum efficiency of green coffee separating is 164.7 kg/hr under the condition of testing with 14.4 rpm at 4 angle incline. In term of standard, it found that the machine can separated only for standard and smaller than standard size of green coffee and the maximum moistness are 9.9%. For the least Specific Energy Consumption [SEC] is 0.01631 MJ/kg and occur with the same condition of experiment. Based on this condition, the Break-Even Point must be sorting out with 1,070,550 kilogram per year and Payback Period will occur at 3.598 years. However, the quantity of separating or the efficiency of machine is mainly effect to Break-Even Point and Payback Period. Description: รายงานการวิจัย -- มหาวิทยาลัยเทคโนโลยีราชมงคลพระนคร, 2553

2011-08-29T06:44:50Z Sangma, Watcharin Tongkhow, pitsanu http://repository.rmutp.ac.th:80/handle/123456789/870 2013-02-27T02:43:59Z 2011-08-29T05:29:20Z

Title: Analysis of steel industries in thailand : Case study of production planning and control by determination of time limited free back orders. Authors: Sangma, Watcharin; Tongkhow, pitsanu Abstract: 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 62,422,386.98. Description: รายงานการวิจัย--มหาวิทยาลัยเทคโนโลยีราชมงคลพระนคร,2553

2011-08-29T05:29:20Z Chalardsakul, Tanawat http://repository.rmutp.ac.th:80/handle/123456789/861 2013-02-26T14:06:40Z 2011-08-23T11:01:01Z

Title: Creating and evaluating the effectiveness of computer assisted instruction program subject electric power system analysis chapter 3-6. Authors: Chalardsakul, Tanawat Abstract: The purposes of the research were to create and efficiency validation of computer assisted for the courses of practiced to reading. Creating and Evaluating the Effectiveness of Computer Assisted Instruction Program Subject Electric Power System Analysis Chapter 3-6 based standard and analyses the leaning achievement of the student after by using computer assisted instruction. The subjects in the study were first year diploma students enrolled in Rajamangala University of Technology Phra Nakhon . The Researcher using the experiment by let the students do until test before class, And then study by using computer assisted instruction focused on practiced to basic turning. After that let students do the unit test again at the class and calculate to find out the efficiency of the computer assisted instruction and analyses the leaning achievement of students after study . The research result revealed that the efficiency of the computer assisted Instruction was efficient in standard, Moreover after learning achievement At significant level of 0.05 . Description: รายงานการวิจัย--มหาวิทยาลัยเทคโนโลยีราชมงคลพระนคร,2553

2011-08-23T11:01:01Z Balasuvatthi, Damrongrit Tongkhow, Pitsanu http://repository.rmutp.ac.th:80/handle/123456789/857 2013-02-27T02:43:28Z 2011-08-23T09:14:12Z

Title: Aggregate planning for optimal production quantity under uncertainty demand : Case study of food animals industry. Authors: Balasuvatthi, Damrongrit; Tongkhow, Pitsanu Abstract: 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 62,422,386.98. Description: รายงานการวิจัย--มหาวิทยาลัยเทคโนโลยีราชมงคลพระนคร,2553

2011-08-23T09:14:12Z Phupha, Vallop http://repository.rmutp.ac.th:80/handle/123456789/854 2013-02-26T14:29:31Z 2011-08-23T05:13:54Z

Title: Creating and evaluating the effectiveness of computer assistedInstruction program subject manufacturing processes chapter 5-8. Authors: Phupha, Vallop Abstract: The purposes of the research were to create and efficiency validation of computer Assisted for the courses of practiced to reading Creating and Evaluating the Effectiveness of Computer Assisted Instruction Program Subject Manufacturing Processes Chapter 5-8. based standard 90/90 and analyses the leaning achievement of the student after by using computer assisted instruction . The subjects in the study were 25 first year. Diploma students enrolled in Rajamangala University of Technology Phra Nakhon. The Researcher using the experiment by let the students do until test before class, And then study by using computer assisted instruction focused on practiced to basic turning . After that let students do the unit test again at the class and calculate to find out the efficiency of the computer assisted instruction. And analyzed the learning achievement of students after study. The research result revealed that the efficiency of the computer assisted Instruction was efficient in standard 90/90 , Moreover , after learning achievement at significant level of 0.05. Description: รายงานการวิจัย--มหาวิทยาลัยเทคโนโลยีราชมงคลพระนคร,2553

2011-08-23T05:13:54Z Paengteeresukkamai, Plangwath http://repository.rmutp.ac.th:80/handle/123456789/851 2012-03-16T10:22:43Z 2011-08-23T02:29:15Z

Title: Creating and Evaluating the Effectiveness of Computer Assisted Instruction Program Practice Cutting Spure Gear ,Shaping Operation, Milling Operation and Drilling Operation. Authors: Paengteeresukkamai, Plangwath Description: รายงานการวิจัย--มหาวิทยาลัยเทคโนโลยีราชมงคลพระนคร,2553

2011-08-23T02:29:15Z Sirimai, Kajohnsak http://repository.rmutp.ac.th:80/handle/123456789/849 2013-02-26T14:07:37Z 2011-08-23T01:58:19Z

Title: Creating and Evaluating the Effectiveness of Computer Assisted Instruction Program Subject Engineering Economy Chapter 1-4. Authors: Sirimai, Kajohnsak Description: รายงานการวิจัย--มหาวิทยาลัยเทคโนโลยีราชมงคลพระนคร,2553

2011-08-23T01:58:19Z Paengteeresukkamai, Plangwath http://repository.rmutp.ac.th:80/handle/123456789/848 2013-02-27T03:28:55Z 2011-08-23T01:36:01Z

Title: Development and Construction of Porker on Fire Machine Semi -automatic . Authors: Paengteeresukkamai, Plangwath Description: รายงานการวิจัย--มหาวิทยาลัยเทคโนโลยีราชมงคลพระนคร,2553

2011-08-23T01:36:01Z Jumroonrut, Sutthipong Phangphet, Prasit http://repository.rmutp.ac.th:80/handle/123456789/845 2013-02-27T03:35:05Z 2011-08-22T09:19:10Z

Title: Study of effects of surface roughness 10 hardness test V2.Lv5 Authors: Jumroonrut, Sutthipong; Phangphet, Prasit Abstract: The objective of this work is to study the effect of the surface roughness on the measured hardness. The preparation of the surface roughness level complied with the ISO 1302: 1992 standard. There are many factors influencing surface roughness such as building mac uncry, feed rate, speed, machine settings, cutter and water cooling. The surface roughness C.tU. by these factors will have influence on the measured hardness of materials. The SKS3 is used as material in this study. Surface of the work piece was adjusted with different roughness val es, divided following four levels: 12-50 urn rough machined, 1.6-6.3 urn smooth turned, 0.2-0.8 urn and 0.025-0.1 um. Then all the adjusted roughness work pieces were harden. After the Harden process, the hardness of all work pieces were 62-64 HRC. From the measured hardness results, it was found that the standard deviations are 4.665, 1.031,0.530 and 0.407 respectively with surface roughness value. Therefore, it can be concluded that the standard deviation of hardness increased when the surface roughness increased Description: รายงานการวิจัย--มหาวิทยาลัยเทคโนโลยีราชมงคลพระนคร,2553

2011-08-22T09:19:10Z Wirotcheewan, Prasert http://repository.rmutp.ac.th:80/handle/123456789/844 2013-02-26T14:27:34Z 2011-08-22T09:17:36Z

Title: Creating and Evaluating the Effectiveness of Computer Assisted Instruction Program Subject Engineering Materials Chapter 3-6. Authors: Wirotcheewan, Prasert Abstract: The purposes of the research were to create and efficiency validation of computer Assisted for the courses of practiced to reading Creating and Evaluating the Effectiveness of Computer Assisted Instruction Program Subject Engineering Materials Chapter 3-6 based standard and analyses the leaning achievement of the student after by using computer assisted instruction . The subjects in the study were 20. Diploma students enrolled in Rajamangala University of Technology Phra Nakhon. The Researcher using the experiment by let the students do until test before class, And then study by using computer assisted instruction focused on practiced to basic turning . After that let students do the unit test again at the class and calculate to find out the efficiency of the computer assisted instruction. And analyzed the learning achievement of students after study. The research result revealed that the efficiency of the computer assisted Instruction was efficient in standard, Moreover , after learning achievement at significant level of 0.05. Description: รายงานการวิจัย--มหาวิทยาลัยเทคโนโลยีราชมงคลพระนคร,2553

2011-08-22T09:17:36Z Pokterng, Singkaew Chomsamut, Kompun Prasit, Pangpech Heankrang, Pattareeya http://repository.rmutp.ac.th:80/handle/123456789/841 2013-02-27T03:29:37Z 2011-08-22T08:19:02Z

Title: Development of Process for Recovery Metal Carbide Powder from Cemented Tungsten Carbide Scraps Authors: Pokterng, Singkaew; Chomsamut, Kompun; Prasit, Pangpech; Heankrang, Pattareeya Abstract: The recycling of materials is the recovered process and the important approach for sustainable development. This research is to study recycling tungsten carbides from cemented carbide scraps by extracting the dissolved of binder phase, and to study the un-dissolved substrate which stayed condition and size in WC particles. The experiment of this research starts in laboratory with electrolysis, is found that the appropriate operating potential is 0.20-1.40 volts, at 30-80 oc, treated in 1N-7N HCl concentrations aqueous solution as well as the movement of solution and specimens had an effect on capacity of dissolution. Additionally, these factors are affected to purity and passivation of WC particles. According to the above experiment, it leads to design and create the semi-automatic cemented dissolution machine with electrolysis. This machine can contain the scraps up to 2.5 kilograms, in rev 0-25 rpm (revolutions per minute), at electric current 0-50 ampere, in electric voltage 0-15 volts. Its flowing process can be 15 lpm (litre per minute) and minute) and temperature is up to 90 oc. Furthermore, there are the relative WC power invention processes included residues, washing, leaching, ball milling, drying, screening, and quality examination. The result of developed machine is capacity of tungsten carbide production is in the range 16-50 gram/hour, the obtained powder is 97.49% of tungsten carbide (WC powder), which contained a few amount of cobalt. However, the dissolution of cemented carbides with this machine can be selected the optimized factors to produce tungsten carbide (WC) to purify more than 99%, ball milled them in the most suitable size and particle sized distribution between 0.30-20.00 μm. Afterwards, combining cobalt 15% (WC-15%Co) and producing to cemented carbides, insert tools, rectangle as SNMG standard 120408, it appears that insert tools has a hardness not less than 1,430 HV, density not less than 14.10 g/cm³. In the other hands, the production of tungsten carbides with advanced technology of dissolution machine and manufacturing machine to produce purely tungsten carbides powder has been required an investment charge of new research and development more than 9,481,888 baht. Description: รายงานการวิจัย--มหาวิทยาลัยเทคโนโลยีราชมงคลพระนคร, 2553

2011-08-22T08:19:02Z Kankaew, Prasong http://repository.rmutp.ac.th:80/handle/123456789/839 2013-02-27T03:36:22Z 2011-08-22T07:18:36Z

Title: This research aims to compare the shrinkage value that limited from manufacturer with the ASTM D955 Standard Test Method Authors: Kankaew, Prasong Abstract: Comparing the shrinkage values of HDPE 2 – 4 % that limited from manufacturer are as the following: 1. Comparing the shrinkage of 60 X 60 mm. specimen The result showed that there aren’t any shrinkage differences among follow the injection, across the injection and the limited value from the manufacturer. 1.1 Comparing the shrinkage of the specimen with 2 mm. thick The result showed that the shrinkage between at the point nearby the entrance is different from at the point further from the entrance and it is also different from the limited value from the manufacturer. 2. Comparing the shrinkage of 12.7 X 27 mm. specimen The result showed that there aren’t any shrinkage differences among follow the injection, across the injection and the limited value from the manufacturer. 2.1 Comparing the shrinkage of the specimen with 3.2 mm. thick The result showed that there aren’t any shrinkage differences among the point nearby the entrance, the point further from the entrance and the limited value from the manufacturer. 3. Comparing the shrinkage of 100 mm. round specimen The result showed that there aren’t any shrinkage differences among follow the injection, across the injection and the limited value from the manufacturer. 3.1 Comparing the shrinkage of the specimen with 3.2 mm. thick The result showed that there aren’t any shrinkage differences among the point nearby the entrance, the point further from the entrance and the limited value from the manufacturer. Comparing the shrinkage values of PET 0.2 - 0.4% that limited from manufacturer are as the following: 1. Comparing the shrinkage of 60 X 60 mm. specimen The finding revealed that the shrinkage value of the follow injection is different from the across injection but it is not different from the limited value from the manufacturer. 1.2 Comparing the shrinkage of the specimen with 2 mm. thick The finding revealed that the shrinkage value between the point nearby the entrance and the point further from the entrance are different but the same as the limitation from the manufacturer. 2. Comparing the shrinkage of 12.7 X 27 mm. specimen The finding revealed that the shrinkage value of the follow injection is different from the across injection but the same as the limited value from the manufacturer. 2.1 Comparing the shrinkage of the specimen with 3.2 mm. thick The result showed that there aren’t any shrinkage differences among follow the injection, across the injection and the limited value from the manufacturer. 3. Comparing the shrinkage of 100 mm. round specimen The finding revealed that the shrinkage value of the follow injection is different from the across injection but it is not different from the limited value from the manufacturer. 3.1 Comparing the shrinkage of the specimen with 3.2 mm. thick The finding revealed that the shrinkage value of the follow injection, the across injection and the limited value from the manufacturer are the same. Both comparing HDPE and PET have statistical significance at 0.05 Description: รายงานการวิจัย--มหาวิทยาลัยเทคโนโลยีราชมงคลพระนคร,2553

2011-08-22T07:18:36Z Kankaew, Prasong http://repository.rmutp.ac.th:80/handle/123456789/837 2013-02-27T03:27:33Z 2011-08-21T06:29:30Z

Title: Creating and Evaluating the Effectiveness of Computer Assisted Instruction Program Subject Adjust Injection Machine and Maintenance Injection Molding. Authors: Kankaew, Prasong Abstract: The purposes of the research were to create and find out the efficiency validation of computer assisted instruction focused on the Plastic Injection Adjusting Machine and Injection Molding Maintenance, for the standard 90/90 and to analyze the students’ learning achievement after using computer assisted instruction. The samples were 20 first year, diploma tool & die students at Rajamangala Institute of Technology North Bangkok Campus. The students pretested and then studied by using the computer assisted instruction focus on the plastic Injection Adjusting Machine and Injection Molding Maintenance. Finally the students post tested. After that the data was calculated to find out the computer assisted instruction efficiency and analyzed the students’ learning achievement after studying. The result revealed that the computer assisted instruction efficiency was reached the standard 90/90 and the students’ learning achievement increased significantly at 0.05. Description: รายงานการวิจัย—มหาวิทยาลัยเทคโนโลยีราชมงคลพระนคร,2553

2011-08-21T06:29:30Z พ่วงเจริญชัย, สมจินต์ http://repository.rmutp.ac.th:80/handle/123456789/757 2012-03-16T05:14:09Z 2010-11-30T08:34:55Z

Title: ระบบปรับอากาศแบบใช้หัวฉีดไอน้ำลดความดัน Authors: พ่วงเจริญชัย, สมจินต์ Abstract: ในปัจจุบันทางด้านอุตสาหกรรมมีการนำเอาหม้อไอน้ำมาใช้กันอย่างแพร่หลาย โดยไดน้ำที่ผลิตขึ้นมา ไอน้ำส่วนที่เหลือสามารถนำมาใช้ประโยชน์ได้ โดยนำมาใช้ร่วมกับระบบหัวฉีดไดน้ำลดความดัน เพื่อผลิตสารทำความเย็นขั้นที่สอง Chilled water ที่ใช้ในระบบปรับอากาศแบบใช้หัวฉีดไอน้ำลดความดัน USER STEAM JET INJECTION FOR AIR CONDITION SYSTEM โดยอาศัยหลักที่ว่าเมื่อลดความดันที่ผิวหน้าของน้ำที่อยู่ในภาชนะที่ปิดมิดชิดแล้วทำให้น้ำที่เหลือในอีวาปอเรเตอร์มีอุณหภูมิต่ำลงด้วย น้ำเย็นที่มีอุณหภูมิประมาณ 4.44-21.1 C จะถูกนำไปหมุนเวียนผ่านแอร์เฮนด์ดิ่งยูนิต Air Handing Unit ในระบบปรับอากาศ โดยจะทำการแลกเปลี่ยนความร้อนกับอากาศจึงทำให้บริเวณที่ต้องการปรับอากาศมีอุณหภูมิลดลง Description: รายงานการวิจัย--มหาวิทยาลัยเทคโนโลยีราชมงคลพระนคร,2548

2010-11-30T08:34:55Z Puangcharoenchai, Somjin http://repository.rmutp.ac.th:80/handle/123456789/756 2012-03-16T05:13:40Z 2010-11-30T08:31:26Z

Title: A Modeling of Heat Transfer in Cooling Coil using Finite Element Method Authors: Puangcharoenchai, Somjin Abstract: In general for the refrigeration, the cooling coil is almost used to be the device to decrease the temperature. Thus, in order to design heat exchange, we should study the heat transfer into the cooling coil. This research proposes the numerical using finite element method for calculating the temperature at any position of the cooling point for considering to porous media. After that, to create an algebraic equation fmite element for writing the program to search the solution by estimating the temperature. The research demonstrates that the changing of temperature will be decreased to saturated condition, that is the temperature around the region of the cooling coil model edge will be decreased. The longer time, the lower temperature around each position will decrease respectively until the temperature at each position inside the model are the same as region of the cooling coil model edge. Therefore, this search result can be the basic for the comparison with the similar problem of other Description: รายงานการวิจัย--มหาวิทยาลัยเทคโนโลยีราชมงคลพระนคร,2548

2010-11-30T08:31:26Z ฤทธิ์ทอง, วิโรจน์ ถิ่นพระบาท, ปฏิภาณ http://repository.rmutp.ac.th:80/handle/123456789/745 2012-03-16T05:14:11Z 2010-11-30T07:25:01Z

Title: The Development of Mathematical Model Using for Determined the Properties of Refrigerant Mixture. Authors: ฤทธิ์ทอง, วิโรจน์; ถิ่นพระบาท, ปฏิภาณ Abstract: Blends of R22/R152a/R124 have been proposed to replace R12 in refrigeration systems.In this research work, a technique to simply evaluate thermodynamic properties of refrigerant mixtures has been developed from Raoult's Law.the method has been approached to evaluate the properties of the refrigerant blends avalable in the market such as MP39( R22/R152/R124 53/13/34),MP52 (R22/R152a/R124 33/15/52)and MP66 (R22/R152/R124 61/11/28) .The results agree well with those given by the manufacture within 5 % error The method has also been used to evaluate the properties of the ( R32/R125/R134a 23/25/52)refrigerant agree wall with those given from the manufacture with in 3 % error The thermodynamic property dlagrams of these refrigerant blends are also proposed. Description: รายงานการวิจัย--มหาวิทยาลัยเทคโนโลยีราชมงคลพระนคร,2552

2010-11-30T07:25:01Z Raksasakul, Wirach http://repository.rmutp.ac.th:80/handle/123456789/744 2012-03-16T10:22:33Z 2010-11-30T07:20:17Z

Title: Creating and Evaluating the Effciency of Computer Assisted Instruction Program for Courses of Physical Fitness Authors: Raksasakul, Wirach Abstract: The purposes of the research were to create and evaluating efficiency of computer assisted Instruction Program for courses of Physical Fitness,based on Standard 90/90 and analyze the leaning achievement of the student after using computer assisted instruction The samples were 20 first year, diploma students in Rajamangala University of Technology Phra Nakhon North Bangkok Campus. The Researcher using the experiment by make pretest,and then using the computer assisted instruction program for courses of physical Fitness. After that the students did the posttest again,and then calculate to find out the efficiency of the computer assisted instruction and analyze the leaning achievement of students after studying. The result revealed that the efficiency of the computer assisted Instruction was efficient in standard 90/90, and after learming achievement Description: รายงานการวิจัย--มหาวิทยาลัยเทคโนโลยีราชมงคลพระนคร,2548

2010-11-30T07:20:17Z Pangsri, Sumrerng http://repository.rmutp.ac.th:80/handle/123456789/657 2012-03-16T09:42:14Z 2010-09-22T06:56:15Z

Title: Creating and Evaluating the Effectiveness of Computer Assisted Instruction Program for Courses of Practiced of File Authors: Pangsri, Sumrerng Abstract: The purpose of the research were to create and efficiency validation of computer assisted for the courses of practiced to basic file , based standard 90/90 and analyse the leaning achievement of the student after by using computer assisted instruction The subjects in the study were 17 first year diploma students enrolled in Rajamangala University of Technology Phra Nakhon. The researcher using the experiment by let the students do until test before class, And then study by using computer assisted instruction focused on practiced to basic turning. After that let students do the unit test again at the class and calculate to find out the efficiency of the computer assisted instruction and analyse the leaning achievement of students after study. The research result revealed that the efficiency of the computer assisted instruction was efficient in standard 90/90, Moreover, after learning achievement at significant level of 0.05

2010-09-22T06:56:15Z Yimchang, Jakkrit http://repository.rmutp.ac.th:80/handle/123456789/651 2012-03-16T09:41:59Z 2010-09-18T04:53:21Z

Title: Creating and Evaluating the Effectiveness of Computer Assisted Instruction Program for Courses of Practiced Make Body of Ornaments Authors: Yimchang, Jakkrit Abstract: The purposes of the research were to create and efficiency validation of computer assisted for the courses of practiced to make body of ornaments, based standard 90 / 90 and analyse the leaning achievement of the student after by using computer assisted instruction The subjects in the study were 17 first year diploma students enrolled in Rajamangala University of Technology Phra Nakhon. The Researcherusing the experiment by let the students do until test before class and then study by using computer assisted instruction focused on practiced to basic turning. After that let students do the unit test again at the class and calculate to find out the efficiency of the computer assisted instruction and analyse the leaning achievement of students after study. The research result revealed that the efficiency of the computer assisted Instruction was efficient in standard 90 / 90 , Moreover , after learning achievement At signifecant level of 0.05. Description: รายงานการวิจัย --มหาวิทยาลัยเทคโนโลยีราชมงคลพระนคร, 2548

2010-09-18T04:53:21Z