Research Journal Phranakhon Rajabhat : Science and Technology

SINGLE CRYSTAL GROWTH OF NaCuPO4 COMPOUND

2026-01-14T16:11:47+07:00

งานวิจัยนี้ มีจุดประสงค์ในการสังเคราะห์สารประกอบ NaCuPO4 ทั้งในรูปแบบที่เป็นผงด้วยวิธีการทำปฏิกิริยาสถานะของแข็งที่อุณหภูมิ 600 องศาเซลเซียส และผลึกเดี่ยวโดยให้เกิดผลึกจากการเย็นอย่างช้า ๆ จากสารประกอบที่ละลายจากการเผาด้วยเตาไฟฟ้าแนวตั้งที่อุณหภูมิ 680 องศาเซลเซียส จากการวิเคราะห์โครงสร้างผลึกด้วยการเลี้ยวเบนรังสีเอกซ์ พบว่า สารประกอบ NaCuPO4 ในรูปแบบที่เป็นผง
มีโครงสร้างแบบ Orthorhombic และ space group ชนิด P212121 ตรงกันกับรายงานวิจัยก่อนหน้า เช่นเดียวกับผลึกเดี่ยวที่สังเคราะห์ได้ในงานวิจัยนี้ ผลึกเดี่ยวที่สังเคราะห์ได้ มีขนาดอยู่ในช่วง 1x1x1 ลูกบาศก์มิลลิเมตร ถึง 1x3x5 ลูกบาศก์มิลลิเมตร สรุปได้ว่า ผลึกเดี่ยวขนาดใหญ่ของ NaCuPO4 สามารถปลูกได้ด้วยการใช้เตาเผาแนวตั้ง สามารถนำไปต่อยอดเพื่อศึกษาสมบัติทางฟิสิกส์อื่น ๆ ต่อไปได้ในอนาคต

DEVELOPMENT OF FRENCH FRIES SUPPLEMENTED WITH PROTEIN FROMRED PALM WEEVIL

2026-02-09T10:59:46+07:00

The objectives of this study were to develop a diet formula for rearing the red palm weevil and develop a french fries supplemented with protein. The experimental results found that diet formula 1 consisted mashed sago, Effective Microoganisms; EM, molasses, pig feed, rice bran, plain water and 100 grams of bean protein had the highest of protein content significantly different (p<0.05) when compared to powder protein of red palm weevil from diet formulas 2, 3 and 4 (control). The protein content was the highest at 46.54%. When developing the french fries formula, it was found that the French fries formula 3 supplemented with 30% red palm weevil powder had the highest chemical composition values (moisture, carbohydrate, protein, fat and ash) with a significantly different (p<0.05). When analyzing the physical properties, it was found that the aw value was between 0.22-0.88, the moisture value was between 2.17-2.96 percent, and the color analysis results of the brightness value (L*) were between 32.26-39.34, the red value (a*) was between 3.56-5.90, and the yellow value (b*) was between 4.16-7.72. The color values of all french fries formulas were significantly lower than those of the French fries (control) formula (p<0.05).

DEVELOPMENT OF AN ONLINE REGISTRATION SYSTEM FOR TRAINING AND SEMINAR MANAGEMENT: A CASE STUDY OF KING MONGKUT’S UNIVERSITY OF TECHNOLOGY NORTH BANGKOK

2026-02-10T15:41:27+07:00

This research aims to study, gather requirements, and develop an online registration system. The purpose of this system is to provide a solution for event organizers in managing meetings, training sessions, and seminars. It can be applied to both internal and external organizations. King Mongkut's University of Technology North Bangkok is provided with an information system for managing and registering attendees for events that follow a standardized format. This system helps reduce errors and operational time. After implementation, user satisfaction was evaluated. The results indicated a very high level of satisfaction, with an average satisfaction score of 4.61. The executive group reported an average satisfaction score of 4.94, the lecturer group reported 4.36, the staff group reported 4.66, the organizer group reported 4.50, and the attendees reported 4.67.

REDUCTION OF NONCONFORMING SEAT-SLIDE RAILS USING DESIGN AND ANALYSIS OF EXPERIMENTS

2026-05-07T13:22:51+07:00

This purpose of this study is to reduce the number of four-way electric motor-adjustable automotive seat-slide rails with an average bearing stopper hole depth below 1.40 millimeters. The problem arises from the parameter settings of bearing stopper hole drilling machine. The related parameters are drilling depth, air pressure, and steel-plate thickness. To address the problem, this study employed the factorial design of experiments to identify the optimal conditions for the drilling process. The results indicated that the appropriate parameter settings consist of drilling depth of 3 millimeters, air pressure of 160 bar, and a steel-plate thickness of 5 millimeters. After implementation of these parameter settings in the actual production process, the average bearing stopper hole depth of the automotive seat-slide rails reached 1.80 millimeters, which is statistically significantly higher than the specification of 1.40 millimeters. In addition, the case study achieved 48% reduction in the number of four-way electric motor-adjustable seat-slide rails with bearing stopper hole depths below the specification when compared with the defect rate before process improvement. The benefits of this study enhance product quality and improves production process consistency for supporting sustainable manufacturing performance in the automotive industry.

REDUCTION OF NONCONFORMING PRODUCTS IN PLASTIC-PACKAGING INDUSTRY USING 2k FACTORIAL EXPERIMENT DESIGN

2026-05-07T13:25:16+07:00

This purpose of this study is to reduce the total number of vacuum bags with surface defects exceeding specification limits by applying the design of experiment. The problem arose from inappropriate parameter settings of the film-blowing machine used in the production of vacuum plastic bags. The machine parameters were feed rate, melt temperature at the film-forming die, and the melt temperatures of three extrusion screws. The study used 2k factorial experiment design to identify the optimal parameters of the film-blowing machine. The results revealed that all the parameters exhibited main and interaction effects on surface defects of the product. The optimal parameter settings were feed rate of 485 kg/h, melt temperature at the film-forming die of 205°C, and screw melt temperatures of 185°C, 200°C, and 195°C, respectively. When these optimal conditions were implemented in the actual production, the nonconforming products with surface defects exceeding specification limits decreased by 11.04% compared with the pre-improvement process. The findings confirm that the systematic application of factorial experimental design can effectively enhance product quality and improve process consistency in the vacuum plastic packaging industry, thereby supporting sustainable quality improvement in manufacturing operations.

SOIL CEMENT COLUMN APPLICATION FOR STABILIZED SOIL PROTECTION SYSTEMS IN DEEP EXCAVATION WORKS USING DIAPHRAGM WALLS: CASE STUDY

2026-02-13T13:51:03+07:00

In deep excavation works within major urban areas particularly in Bangkok, the safety of soil protection systems is concerned. In addition, soil movement must be carefully controlled to prevent the impacts on adjacent nearby structures. Soil cement columns, an effective ground improvement technique, have been applied in underground construction to enhance stability and reduce soil displacement. This paper presents the design concept, construction techniques, and case studies of deep excavation projects where Diaphragm walls were stabilized with soil-cement columns. Two construction approaches are considered: 1) the arrangement of soil-cement columns to reduce active earth pressure, and 2) the arrangement of soil-cement columns to increase passive earth pressure. The study results indicate that the use of soil-cement columns can significantly reduce ground movements and enhance the safety of earth-retaining systems during deep excavation. Moreover, this method helps minimize the risk of damage to nearby structures.