Scratch-Induced Deformation of Poly(methyl methacrylate) under Dry and Wet Conditions

ABSTRACT Poly(methyl methacrylate) (PMMA), transparent thermoplastic materials similar to glass, was applied in several wide-ranging applications such as cell phone display screens, transparent windows and signboards. However, they are soft and easily appeared poorly transparent properties when getting scratches on their surfaces of applications under dry and wet conditions. Therefore, in this research, the features of PMMA materials after scratch damage was studied by diamond scratch tester under various loads at different environments. The optical microscope was thus applied to investigate the morphology of scratch track on the materials. In addition, the scratch resistance was analyzed by the scratch tester. From the results, the scratch depth was increased with an increasing load in both conditions as well as with the higher stress concentration. The scratch hardness, specific scratch wear rate and scratch coefficient of friction related with the applied load that it affected elastic and plastic deformation state

ทิศทางการจัดเรียงตัวของอนุภาคเสริมแรงที่ส่งผลต่อการสึกหรอของพอลิเมทิลเมตะไครเลท

รายงานวิจัย -- มหาวิทยาลัยเทคโนโลยีราชมงคลพระนคร, 2561Epoxy is one type of materials for adhesive. It was improved the strength by adding the filler such as iron, alumina or silica. Generally, the epoxy adhesive was mixed with iron for application in the metal adhesive. The mechanical properties were importance of adhesive. Because, it was one factor for lifetime limit. The iron/epoxy was casted in the magnetic field which was alignment with surface of samples. The alignment of iron particles was induced with magnetic fields. The mechanical properties and wear behavior of samples were investigated hardness and wear test. It was found that the alignment of iron particles in the epoxy were improves hardness and wear.Rajamangala University of Technology Phra Nakho

การศึกษาอุณหภูมิการเผาเปลือกหอยลาย เพื่อเพิ่มสมบัติของอิฐมอญผสมวัสดุรีไซเคิลจากเปลือกหอยลาย

รายงานวิจัย -- มหาวิทยาลัยเทคโนโลยีราชมงคลพระนคร, 2561This research is to study the recycling of residue clams shell from Mahachai, Samutsakorn, Thailand. This waste was collected from canned clams industry and it can be recycled as the composition of Mon brick instead of the rice husk. The study of clams shell composition found that Calcium was main composition as 98.50%VS. The moisture and ash content was 0.88% and 58.27%TS respectively. The works methodology is using ash from clams shell incinerated at temperature 900, 1000, 1100 and 1200oC in 5 hours respectively instead of rice husk in Mon brick processing. The fabrication of Mon brick was in size 5x5x5 cm adding ash from clams shell intead of rice husk. The result found that increasing the temperature to incinerate clams shell ash instead, density and compressive strength increased while moisture and water absorption deceased. When Mon brick was fabricated in standard size at 6x15x3.5 cm, the changed material characteristics was in the same trend as previous size. Mon brick in standard size adding 100% clams shell ash instead of rice husk had density 2.63 g/cm3, moisture content was 2.86%, water absorption at 1 and 24h was 17.40 and 20.16% respectively and compressive strength was 0.52 MPa. These characteristics was according to standard of Engineering Institute of Thailand. It can reduce the cost of rice husk in Mon brick factory 28,800 bath/year while the waste from canned clams factory could be reduced 20.94%.Rajamangala University of Technology Phra Nakho

การพัฒนาปรับปรุงการสร้างทองระดับนาโนด้วยการใช้จุลินทรีย์ท้องถิ่น ในประเทศไทย

รายงานวิจัย -- มหาวิทยาลัยเทคโนโลยีราชมงคลพระนคร, 2557The study is the development of biological methods for extracting gold from the effluents of the gold processing and gold extraction in the industries where has a very high acidity (pH 0-4). This method should be used to replace the electrochemical process and chemical method which cause the pollution of toxic substances, acid fumes and heavy metals of copper cyanide to the environments. The research started at the characterization and identification of microorganisms presented in gold contaminated water in natural source where is highly acidic (pH 2-4) and it could synthesize nanogold particles. The bacteria Bacillus sp. E201 were identified from this source and it showed its 16S rDNA gene with similarity of 95% to bacteria Bacillus thuringiensis accession no. FJ755916. It could create gold in the solution outside the cells within three days Form 1 mM HAuCl4 • 3H2O solution, the bacterial dry weight could yield 75.3% with the amount of 0.5115 grams. It could be able to withstand acidic conditions and harvest gold from the gold extraction solution after centrifugation and filtration. So this developed biological method could be developed to apply in the industrial production of gold and jewelry industry.Rajamangala University of Technology Phra Nakho

การพัฒนานวัตกรรมต้นแบบเครื่องผลิตน้ำสะอาดเพื่อส่งเสริมสุขาภิบาลน้ำในช่วงสถานการณ์ COVID-19

รายงานวิจัย -- มหาวิทยาลัยเทคโนโลยีราชมงคลพระนคร, 2565In Klong Rangsit, Pathumthani province, where the water entering was filtered by a prototype quality water machine and autonomously controlled by pumps and sensors, this research tested improvements to water quality. It employs a total dissolved solid and temperature sensor as part of the consideration of the water quality criterion in accordance with the water quality requirements of the Pollution Control Department, and is 99% successful in treating contaminants in water. According to the Pollution Control Department's water quality criteria, which are divided into four main categories: very good water quality, good water quality, degraded water quality, and very degraded water quality, it is used in the analysis of the division of the four categories of water quality. Machines for producing good quality water to maintain water sanitation during COVID-19 and anticipated flooding across the nation. This is simple to use. Since the made quality water machine prototype has a battery to back up the power for the pump and UV lamp control by filtering water through various stages of a quality water producer prototype, it is simple, can generate clean water for usage, and can be carried. No energy is used, and there is no residue filtration effluent. It eliminates 99 percent of water pollutants and has no color.Rajamangala University of Technology Phra Nakho

การพัฒนาระบบสารสนเทศในการจัดการทรัพยากรและฐานข้อมูล

รายงานวิจัย -- มหาวิทยาลัยเทคโนโลยีราชมงคลพระนคร, 2561This research is the study and development of the information system for managing resources and database by focusing on the workload academic teacher (WAT) systems for the teachers worked on the Faculty of Science and Technology, Rajamangala University of Technology Phra Nakhon. The main objective was to develop the WAT systems based on the web-based application (web application) and to evaluate the effectiveness and to assess user satisfaction with WAT systems. The WAT systems were also performed based on the system development life cycle (SDLC) and requirements gathering analysis of existing systems with the paper-based managements to new systems for use in the electronic managements. The evaluation of efficiency of the WAT systems was performed by the information technologists for the functionality of WAT systems, resulting in the average satisfaction score is 4.36 with the standard deviation of 0.54. As the same experts, the satisfaction of usability, such as login procedure, choosing the workload issues, to easy document upload and filledforms performances etc., resulting in the average satisfaction score is 4.29 with the standard deviation of 0.55. These results provided the high level of experts’ satisfaction. After improving the WAT systems, the functionality and the usability of systems were evaluated by usage teachers. It was found that the average satisfaction score of the functionality is 4.21 with the standard deviation of 0.67 and the usability is 3.56 with the standard deviation of 0.96 (n=15). It can be implied that the WAT systems can be applied to practical and responsive to the needs of users.Rajamangala University of Technology Phra Nakho