制御された細孔径を有するSiO2-ZrO2ナノ濾過膜 : 製膜、安定性および性能

内容の要約広島大学(Hiroshima University)博士(工学)Doctor of Engineeringdoctora

Preliminary techno-economic analysis of non-commercial ceramic and organosilica membranes for hydrogen peroxide ultrapurification

Polymeric membrane cascades have demonstrated their technical and economic viability for hydrogen peroxide ultrapurification. Nevertheless, these membranes suffer from fast degradation under such oxidative conditions. Alternative membranes with higher chemical resistance could improve the ultrapurification process. Therefore, this work presents the preliminary techno-economic analysis of two non-commercial membranes (a ceramic one and a hybrid organosilica one). This analysis is complemented with further research regarding the competitiveness of these alternative membranes compared to polymeric ones. The results confirm the technical viability for both membranes, but the ceramic membrane is not appropriate when Na is considered as the limiting impurity (because it has too low rejection coefficient). The economic viability of the proposed ultrapurification processes is also probed, but not under competitive conditions, as the polyamide membrane appears to be the optimal choice. Nonetheless, improvements in the permeability of the hybrid membrane (an increase in the membrane permeability by a factor of 10) or the rejection performance of the ceramic membrane (an increase in the reflection coefficient above 0.85) could transform these non-commercial membranes into the most profitable alternative.This research has been financially supported by the Spanish Ministry of Economy and Competitiveness (MINECO) through CTQ2014-56820-JIN Project, co-financed by FEDER funds. R. Abejón acknowledges the assistance of the Japan Society for Promotion of Science (JSPS) for the award of a Post-Doctoral Fellowship (Short-Term) for North American and European Researchers (PE14057)

A study of obtained knowledge using from physics I for engineers for daily life application of undergraduate student at Rajamangala University of Technology Phra Nakhon

รายงานการวิจัย -- มหาวิทยาลัยเทคโนโลยีราชมงคลพระนคร, 2554The purpose of this study was to investigate obtained knowledge using from Physics I for Engineers for daily life application of undergraduate student from faculty of engineering, Rajamangala University of Technology Phra Nakorn. Sample was 316 students, which taken from four engineering majors; computer, electrical, industrial and mechanical engineering. A questionnaire a four point scale was used as testing tool. The statistical analyses were performed in mean, standard deviation and one way analysis of variance. The results revealed that students used their obtained knowledge in moderate level (3.10). Students in each programs showed significantly different used their obtained knowledge at 0.05 level. Electrical engineering students (3.27) showed highest number of the course content using follow by mechanical engineering (3.09), computer engineering (3.07) and industrial engineering (2.75) respectively.Rajamangala University of Technology Phra Nakho

Laboratory system electric field From electric pole

รายงานการวิจัย -- มหาวิทยาลัยเทคโนโลยีราชมงคลพระนคร, 2553The experimental models of electric fields were set up by using 4 forms of electric poles, a point - point, point - rod, parallel rod and coaxial ring. The equipotential lines and electric line of force were drawn by using Microsoft Office Visio Program 2007. The drawing of equipotential lines and electric field had shown the direction of electric field moving from the positive electrode toward the negative electrode and perpendicular to the equipotential line. The point - point poles in 10 cm. distance have constant and the highest electric fields which is 28.64 V/m. The electric fields of point - rod, parallel rod and coaxial ring are 60.51 V/m, 45.81 V/m and 181.98 V/m respectively.Rajamangala University of Technology Phra Nakho

Design and development of computer assisted instruction from principle of biology course on topic of “Cell division”

รายงานการวิจัย -- มหาวิทยาลัยเทคโนโลยีราชมงคลพระนคร, 2555The purpose of this study was the design and development of a Computer Assisted Instruction program for a Principles of Biology course on the topic of cell division. The sample group was 175 students, taken from the food and nutrition major, studying for a bachelor’s degree, in the second term of the first academic year (2011) from the Faculty of Technology and Nutrition, Rajamangala University of Technology Phra Nakorn. Statistical analysis of the mean and standard deviation were preformed of the test’s satisfaction toward the Multimedia Computer Program, along with T-test analysis of the test data to determine learning achievement before and after use of the Computer Assisted Instruction. The results found that learning achievement scores for the Multimedia Computer Program after Computer Assisted Instruction were significantly higher than before at the 0.05 level. The test’s satisfaction toward learning via the Multimedia Computer Program was also high.Rajamangala University of Technology Phra Nakho

Characterization of cellulose membranes produced by Acetobacter xyllinum

Cellulose membranes formed by Acetobacter xylinum under known cell density in a culture medium were characterized. A dead end testing unit was used for water flux and filtration of Chlorella sp. and bovine serum albumin (BSA). This study found that the cells formed membranes faster in sucrose supplemented coconut juice than in the standard Schramm & Hestrin's medium. For two-day formed membranes in the former medium, an increase in cell density from 1 × 108 to 2 × 108 cfu.ml-1 reduced water flux and, hence, reduced the hydraulic permeability coefficient (Lp) from 3.6 × 10-10 to 0.5 × 10-10 m3N-1s-1. These membranes were asymmetric-hydrophilic type with thickness less than 6.0 μm. Membrane porosity was found to vary from 1.4% to 2.4%, with the averaged pore size 0.08 μm. Under 100 kPa filtration, two-day formed membranes in sucrose supplemented coconut juice with higher cell density rejected Chlorella cells and BSA by 99.8% and 98.4%, respectively

การพัฒนาเครื่องมือวัดค่าความเร่งเนื่องจากแรงโน้มถ่วงของโลก

รายงานวิจัย -- มหาวิทยาลัยเทคโนโลยีราชมงคลพระนคร, 2561On Earth all objects have a weight which Earth's mass exerts on them to downward force of gravity. The weight of an object can find something's weights in Newton unite. It calculated on multiply the mass in kilograms by the acceleration of gravity in the units of meters/seconds2. The purpose of this study was to design and develop an experimental setup for measuring the gravity acceleration. It involved designing by using free-fall motion method in vacuum tube based on digital Technology and photo gate sensor, measured the velocity of the ball object. The data were analyzed by Microsoft Excel. The value of gravity acceleration obtained at 9.617 m/s2 from the experiment set up. The value from the experiment was compared with the obtained from true value at Bangkok, Thailand. It found the error at 1.697 %. The assessment of the quality used a questionnaire for data collection. Five content experts in Physics teaching evaluated it. That found mean 4.89. The results of the study revealed that the experimental set up were excellent quality of and high efficiency. So that, this experiment suitable to be used in physics classroom.Rajamangala University of Technology Phra Nakho