Kasem Bundit Engineering Journal

การศึกษาปัจจัยที่มีศักยภาพต่อการสนับสนุนการจัดตั้งเขตพัฒนาพิเศษภาคใต้

2023-08-05T13:47:28+07:00

This research aims to analyze the importance of both freight transportation and passenger transportation, and to compare the significance of factors in freight transportation and passenger transportation in the special development zone which consists of Songkhla, Phatthalung, Nakhon Si Thammarat, Trang and Krabi, using the Analytical Hierarchy Process (AHP). The research findings indicate that, overall, the five provinces have similar importance placed on both freight transportation and passenger transportation, except for Nakhon Si Thammarat, which gives higher priority to passenger transportation. On the other hand, Songkhla gives significantly more emphasis on freight transportation compared to passenger transportation, almost twice as much. When comparing the factors related to freight transportation in all five provinces, they prioritize transportation by road, followed by telecommunications and information technology respectively. When comparing the importance of factors in passenger transportation overall, it is observed that air transportation is given the highest priority. This is because the area is relatively far from Bangkok, and passengers tend to prefer air travel. Meanwhile, rail transportation focuses on providing local train services due to the lower pricing. As for water transportation, it primarily caters to travelers covering shorter distances. In practice, this area places more emphasis on water transportation for short-distance travel and provides a competitive advantage in this regard.

การเพิ่มสมบัติไฮโดรโฟบิกของอะลูมิเนียมด้วยวิธีทางกลและเคมีเพื่อเพิ่มความสามารถในการทำความสะอาดตนเองได้

2023-11-02T09:35:31+07:00

The objectives of this study is to develop an aluminum surface with hydrophobic properties of the surface by mechanical and chemical methods. The aluminum plate was polished with the sandpaper number 600, 800, 1000, and polishing and it was soaked in hydrochloric acid and oxalic acid for 14 hours, and the aluminum surface characteristics were analyzed using various techniques, including SEM, AFM, XPS and hydrophobic testing by measuring the contact angle. The AFM technique revealed that the sample that had been polished with number 800 sandpaper had the highest surface roughness of 851.77 nanometers. The hydrophobicity testing showed that the contact angle of water droplets on the aluminum surface was the highest at 140.92^o. This indicates that a higher surfaces roughness leads to a larger contact angle and better hydrophobic properties.

การศึกษากระบวนการผลิตน้ำมันเชื้อเพลิงจากขยะพลาสติกด้วยเครื่องปฏิกรณ์แบบหุ้มฉนวนใยเซรามิกและไม่มีฉนวนหุ้ม

2023-07-17T13:41:31+07:00

The purpose of this research is to draw up a design, improve and construct a plastic waste incinerator. To produce fuel with a ceramic insulated reactor and not insulated the research results were divided into 2 parts: 1) physical properties of the product, 2) the effect of ceramic fiber insulated and non-insulated reactors. To analyze the effect of temperature, quantity, density, heat generated in the production process of fuel from plastic waste. along with studying the optimum conditions in the production process of fuel from plastic waste. It was found that the color of oil from PP, LDPE and HDPE was yellow, and the color of PS oil was orange. The fuel from PS, PP, LDPE and HDPE were 2.14, 2.19, 2.20 and 2.21, with the temperature between the formation of the flame is 390.3, 385.6, 431.7 and 422.9 degrees Celsius respectively, when compared to general market fuel. Diesel was found to be incapable of igniting and Gasohol 91 had the shortest flame duration. The pyrolysis temperature at the optimum average heating rate was between 2.75–6 °C/min, which resulted in complete degradation of the plastic structure. The product is most liquid fuel. The density of the fuel was in the range of 0.698–0.811 g/cm³ and the color of the obtained oil was similar, But the amount of oil and the calorific value of fuel from a furnace insulated with 1inch thick ceramic fiber was only slightly higher than that of a non-insulated furnace where LPG wasted in heating the furnace 0.75 kg by the volume of oil obtained and heat value Of PS plastic waste, the highest was 895 or the percentage of yield was 89.5% and 43.67 MJ/kg, respectively. It was found that these approximate components were in the same range as the relevant research. Therefore, the production process of fuel from plastic waste with ceramic fiber insulated reactor. It is suitable as a tool to produce fuel from plastic waste, because it saves more energy and obtain more fuel products, to be an alternative fuel or to replace the fuel sold in the general market.

การสกัดแคโรทีนอยด์จากเนื้อสีเหลืองของฟักข้าว: สภาวะที่เหมาะสมในการสกัดด้วยเอนไซม์และความสามารถในการต้านอนุมูลอิสระของสารสกัด

2023-05-19T10:36:47+07:00

The aims of the current research were to optimize conditions of Rapidase Ex Color-assisted carotenoid extraction from yellow pulp of Gac fruit and to evaluate the antioxidant capacities of its extract. First, the proper Rapidase Ex Color concentrations (0.25–3.0%) were investigated. It was found that the highest lutein, lycopene and β-carotene contents was observed for the sample treated with 1% of enzyme. Thus, 1% of enzyme was selected for further study relating to the effect of pretreatment time on the carotenoid contents. The result showed that the pretreatment time with enzymatic treatment for 3 h gave the highest lutein (40 mg/g), lycopene (33 mg/g) and β-carotene (48 mg/g) contents. Furthermore, the extract, prepared by applying 1% of enzyme and 3 h of pretreatment time, was accessed its antioxidant capacities by DPPH-RSA, FRAP and reducing power methods. The data revealed that the antioxidant capacities of the enzyme-treated sample was higher approximately 2 times for DPPH-RSA and reducing power methods and 1.5 times for FRAP methods when compared to that of the enzyme without enzymatic treatment. Therefore, the utilization of Rapidase Ex Color could assist for increasing yield of carotenoid extraction as well as antioxidant capacities.

การประยุกต์ใช้เทคนิคการวิเคราะห์ตามลำดับขั้นในระบบปฏิบัติการแอนดรอยด์ (กรณีศึกษาการเลือกซื้อรถยนต์ที่ดีที่สุด)

2023-06-07T10:19:22+07:00

This article's research has created an analytical hierarchy process on the android operating system by creating a mobile application system to optimize analytical hierarchy process decision making (Analytical Hierarchy Process: AHP). This android operating system comprises eight areas for designing mobile apps, which include 1) The optional assignment portion 2) The low threshold part (Threshold Level) 3) The component for picking the first option from the possibilities shown in the first layer. 4) The section for setting the criteria (Criteria) 5) The section for developing the decision hierarchy (Develop Decision Hierarchy) 6) The section Comparison of criteria per pair. 7) Section for estimating the alternative importance of weight (Weight) 8) Section for Sensitivity Analysis. By employing a sequence analysis approach (AHP) to Increase the effectiveness of decision-making. It features a distinct working technique that is simple to grasp there are features that may be utilized to determine the value of numerical alternatives as well as to determine the value of numerical alternatives. Can determine the rationale for the choice this enables decision-makers to organize their thoughts thoroughly and without ambiguity. Is a method that has been utilized because it aids in the saving of time. Improve the assessment's accuracy reduced prejudice leads to more credible research. Because the application system shown here was created for usage on smartphones running the android operating system. It is available for free download on the “Google Play Store” for those who are interested.

EXPERIMENTAL STUDY ON HEAT TRANSFER ENHANCEMENT OF FLUID FLOW INSIDE INTERNALLY FINNED PIPE BY THE USE OF MAGNETIC PARTICLE SUSPENSIONS IN PULSATING FLOW

2023-07-12T10:54:52+07:00

The method for increasing the rate of heat transfer is presented in this experimental study using the suspensions of magnetic particles which are composed of γ-Fe₂O₃ magnetic particles (gamma-typed iron oxides) ranging in average diameter size 10-20 nm dispersed in distilled water. At different volume concentrations of 0.50%, 0.75%, 1% and 1.25%, the experiments were conducted in a vertical, internally finned pipe. To increase the heat transfer rate, three different intensities of external magnetic field 800 Gauss (G), 1,600 G, and 2,400 G were applied during the pipe flow experiments. All tests were performed within the Reynolds number (Re ~ 2,900-9,800). The outside surface area of the copper pipe was directly applied by the uniform surface heat flux during heat transfer experiments. As the volume concentration of the magnetic particles and the external magnetic field intensity increased, the average heat transfer coefficients increased. The maximum increase in heat transfer rate can be gained at particle volume concentration of 1.25% and the strength of external magnetic field of 2,400 G as compared to the base case with no application of the external magnetic field (0 G). The pulsating flow with high frequency is another factor which can increase the heat transfer rate in the pipe flow. At the frequency of 15 Hz, considerable amount of heat transfer rate can be attained.

การศึกษาประสิทธิภาพเนินชะลอความเร็วพื้นที่อำเภอบางเสาธง จังหวัดสมุทรปราการ

2023-08-10T13:24:33+07:00

This study focuses on assessing the effectiveness of speed bumps in the Bang Sao Thong district, Samut Prakan province. The primary objective is to examine the impact of speed bumps on vehicle speeds with the aim of reducing accidents and associated losses significantly. However, speed bumps are considered road obstacles, and this study emphasizes their importance while comparing vehicle speeds before and after encountering speed bumps of various designs. The categorization is based on the width of the speed bump. The research findings indicate that speed bumps with a width not exceeding 0.90 meters result in an average speed reduction of 39.93%, while those with a width greater than 0.90 meters lead to an average speed reduction of 48.71%. The study concludes that speed bumps wider than 0.90 meters significantly affect the effectiveness of speed reduction for vehicles passing over them independently on the specific road segment. It recommends continuous maintenance and improvements to ensure optimal functionality. Statistical analysis shows a significant difference in vehicle speeds before and during interaction with speed bumps, particularly with widths below and above 0.90 meters, rejecting the null hypothesis at a 0.05 significance level. In summary, the study suggests that adjustments and enhancements to speed bump designs can contribute to more effective speed control, ultimately enhancing road safety.

ความว่องไวทางชีวภาพของเหล็กกล้าไร้สนิม AISI 304 และ AISI 316 ที่เคลือบผิวด้วยไฮดรอกซีอะพาไทต์

2023-09-14T11:42:30+07:00

This research aims to study the bioactivity of stainless steel AISI 304 and AISI 316 coated with hydroxyapatite using spraying method. After being coated, the samples were sintered at 900 ºC. The results showed that the surface roughness value increased when coating procedure. The AISI 316 stainless steel has a higher roughness than AISI 304 and when used to test the hydrophobic and hydrophobic properties by measuring the contact angle of water droplets on the surface. The coated sample have a contact angle greater than 90º, showing hydrophobic properties. The bioactivity test showed that AISI 316 stainless steel coated with hydroxyapatite and sintered showed better bioactivity than AISI 304 stainless steel. However, both grades of coated stainless steel AISI 316 and AISI 304 exhibit hydroxyapatite crystallization in the form of calcium phosphate. Which shows good biological compatibility and the potential for bone formation.