RMUTSB ACADEMIC JOURNAL 2022-05-29T08:25:32+07:00 ดร.ณัฐพงศ์ วงษ์ดำเนิน Open Journal Systems The study and health analysis of low voltage circuit breaker and transformer in 22,000 volts substations 2021-10-05T13:54:23+07:00 Phummarin Thavitchasri Jakrapan Nanthaphunkul <p> This research presents the study and health analysis of low voltage circuit breaker and transformer in 22,000 volts substations. The objective of this research was to study the current conditions for system management of electricity supplies production in factory. The equipment failure occurred previously resulting to the process failure. The study was consisted of 6 substations and the data was collected from procedure of research methodology by using data record of physical conditions and specific test results. The calculations of the health index of transformer 12 units indicated that the health index of transformers was very good for 4 units, good for 4 units, fair for 2 units and poor for 2 units, which should be plan for urgent maintenance to protect the occurring failure. The results of health index for circuit breaker in total 12 sets were very good for 6 units, good for 4 units, and poor for 2 units. The results of health index of transformer and low voltage circuit breaker could be used to analyze the condition of equipment’s set-up maintenance plan to extend the shelf-life of equipment and to continuous the efficiency of power distribution system.</p> 2022-05-29T00:00:00+07:00 Copyright (c) 2022 Increasing productivity of clay brick forming to build a clay house using compressive forming equipment 2022-02-10T09:32:17+07:00 Chaiwat Kittidecha Sommai Saramath Puttasayan Narapinij Nutchanon Thaikrua Kriangsuk Supinna Triluk Yawichai <p> Doi Pu Muen Community, Fang District, Chiang Mai Province, is located on the edge of Thailand where the electricity is produced from solar cells and hydropower. Building a clay house was developed and planed for staying and supporting the tourists. The process of clay lumps production with dimensions of 20 centimeters wide, 35 centimeters long, and 12 centimeters high is currently using the method of compacting the soil mixed with rice husks into the wood form, which takes an average of 150 seconds per lump. The average waiting time for drying the clay lumps is 30 days and the labor cost of 1.56 baht per lump which causes to delay of clay house construction problem. According to those problems, the researchers designed and built a compression molding kit that was able to increase molding efficiency with an average compression time of 84 seconds per lump, 44% reduction, using the average drying time of 18 days, or 40% reduction, labor cost 0.88 baht per piece or 44% reduction, the density and water absorption values were not much different. The analysis of the optimum soil mix ratio using the mixed experimental design technique. The soil ratio was 75% and the rice husk ratio was 25% or equal to 12 kg of soil weight, 4 kg of rice husk, using 3 kg of water for mix clay extrusion of one lump which was the appropriate ratio. Totally, the cost of compressive forming equipment was 13,500 baht while the benefit of investment is 136 baht per day, so that we can calculate the payback period of 3.30 months.</p> 2022-05-29T00:00:00+07:00 Copyright (c) 2022 Forecasting influenza incidence by SARIMA model in Nong Khai Province 2021-12-17T14:47:36+07:00 Masronee Arwaekaji Jutatip Sillabutra Chukiat Viwatwongkasem Pichitpong Soontornpipit <p> The aims of this study were to determine the suitable model for forecasting the influenza incidence in Nong Khai province by using the monthly influenza data from 2016 to 2019. The Akaike’s Information Criteria (AIC), Bayesian Information Criteria (BIC), Root Mean Square Error (RMSE) and Mean Absolute Percentage Error (MAPE) were used to determine the efficient of the suitable model. The results were showed that the best model for forecasting influenza incidence was SARIMA (0,1,0)(2,1,0)<sub>12</sub>, providing the lowest AIC (102.37), BIC (107.04) with the RMSE value of 0.65 and MAPE value of 8.30%. It was indicated that SARIMA (0,1,0)(2,1,0)<sub>12</sub> could be used to predict the influenza incidence in the future. The forecast information could be used to plan the influenza prevention and control, including the surveillance system for the area.</p> 2022-05-29T00:00:00+07:00 Copyright (c) 2022 Effect of sweet basil extract and gelatin contents on quality of sweet basil jelly product 2021-10-05T15:08:50+07:00 Supaporn Pajareon Wijitra Liaotrakoon Vorawood Tarawood <p> The research aimed to study effect of sweet basil extract (SBE) and gelatin contents on quality of sweet basil jelly product. The result was showed that the color of SBE lightness (L*), redness (a*) and yellowness (b*) values was 53.17, -4.56 and 41.55, respectively. The bioactive compounds such as phenolic compounds, antioxidant activities, and chlorophyll contents of SBE were 204.96 mg GAE/100g, 80.34% and 195.42 mg/100 g, respectively. The study on the effect of SBE and gelatin content on quality of jelly product were found that increasing of SEB content affected in decreased lightness (L*) and redness (a*), while increased yellowness (b*). An increasing of gelatin content resulted on hardness, chewiness and springiness. The color and texture affected sensory evaluation of the panelists accepted the jelly with SBE 15% and gelatin 7.5% which provided the sensory score of color, flavor, texture and overall liking as 8.00, 8.20, 8.50 and 8.50, respectively. Therefore, the optimal formulation of sweet basil jelly product should consist of SBE 15% and gelatin 7.5%, respectively for consumer acceptance.</p> 2022-05-29T00:00:00+07:00 Copyright (c) 2022 Development of ex vitro Rhynchostylis plantlets in cutting ball containing different concentrations of naphthaleneacetic acid 2021-11-10T08:51:58+07:00 Dang Cong Du Siripun Sarin Dang Van Dong Aphichat Chidburee <p> The study was aimed to evaluate the effects of various concentrations of naphthaleneacetic acid (NAA) in encapsulated alginate as a cutting ball on <em>ex vitro</em> development of<em> Rhynchostylis gigantea</em> plantlets. NAA concentrations in a cutting ball caused particular effects on development of roots and leaves of <em>R. gigantea</em> plantlets. There was the changing of root diameter coincidentally followed by the altering of the rate of root initiation and average number of originated roots among treatments. The optimum time to carry <em>ex vitro R. gigantea</em> plantlets was 4 weeks. The NAA concentrations ranging from 1 to 2 ppm promoted better root development of <em>ex vitro R. gigantea</em> plantlets than other treatments. NAA concentration at 1 ppm gave the highest rate of leaf initiation, but it showed the lowest content of chlorophyll.</p> 2022-05-29T00:00:00+07:00 Copyright (c) 2022 Microbiological quality of bubble tea beverages sold in Phra Nakhon Si Ayutthaya district 2021-11-11T16:02:36+07:00 Dounghatai Rattanasatchatham Kanya Kokaew <p> Nowadays bubble tea is so popular beverage which widely available in department store and roadside shop. However, the production process of bubble tea has several risk points for microbial contamination. This study aimed to investigate the microbiological quality including <em>Escherichia coli, Staphylococcus aureus, Salmonella </em>spp<em>.</em>,<em> Bacillus cereus, </em>yeast and mold in 25 samples of bubble tea beverage sold in Phra Nakhon Si Ayutthaya district. The analytical results showed that 9 samples accounting for 36% of total samples were not acceptable according to the microbiological standard by Department of Medical Sciences Announcement vol.3 (2017). <em>E. coli</em> and <em>S. aureus</em> were detected the highest followed by yeast accounting for 16, 16 and 8%, respectively. Moreover, the molds were detected within the standard and <em>Salmonella</em> spp. and <em>B. cereus</em> were not detected in all samples. Therefore, good hygiene should be realized by beverage producer to ensure safety for consumption.</p> 2022-05-29T00:00:00+07:00 Copyright (c) 2022 Isolation and identification of GABA-producing lactic acid bacteria from fermented foods 2021-12-30T11:45:33+07:00 Watcharacha Krongkeha <p> GABA, gamma aminobutyric acid, is a neurotransmitter, which can be naturally produced by lactic acid bacteria that are commonly found in fermented foods. The purpose of this research was to isolate and identify potential strains of lactic acid bacteria that can produce GABA from 2 different types of fermented food products, namely Nham and Pla Som. MRS agar medium containing 5% monosodium glutamate (MSG) and 0.50% calcium carbonate (CaCO<sub>3</sub>) was used for bacterial isolation. Forty isolates of lactic acid bacteria were tested for GABA production in MRS broth containing 5% MSG. All isolates of lactic acid bacteria were able to produce GABA. Four isolates were selected, namely N1-2, N2-9, F1-4 and F2-6, due to high capability of GABA production at the maximum amounts of 0.13, 0.05, 0.04 and 0.02 mg/10g, respectively. They are Gram-positive bacteria. The N1-2 and F1-4 isolates are bacilli. The N2-9 and F2-6 isolates are short bacilli and cocci. The results of nucleotide sequences of the 16S rRNA genes revealed that N1-2 was identified as <em>Lactobacillus plantarum</em>. F1-4 could be identified as <em>Lactobacillus pentosus</em>. In addition, N2-9 and F2-6 were identified as <em>Weissella paramesenteroides</em>. Therefore, the selected lactic acid bacteria have the potential to be developed as a starter culture in the fermented food industry.</p> 2022-05-29T00:00:00+07:00 Copyright (c) 2022 The use of discarded sweet potato tuber as feed on egg production, egg quality and blood parameter of laying hen 2021-10-05T15:27:51+07:00 Sonthaya Moonsrikaew Chusak Pulma Teerapong Jaichansukkit Kanokvan Aeuplang <p> Discarded sweet potato tubers (SPT) were abundant and cheap. This research aimed to study effects of the use of SPT as feed for feeding laying hen on egg production, egg quality and blood parameters. The research was conducted by a completely randomized design (CRD) using 41-week-old of Lohmann brown laying hens of 150 in total. The experiment was divided into 5 treatments, the pigment negative control feed formulated based on cassava chip meal (CM), positive control feed formulated based on ground corn (C), and the corn replace with SPT at 50, 75 and 100 percentage (SPT<sub>50</sub>, SPT<sub>75</sub> and SPT<sub>100</sub>, respectively). It was found that the hen-day-egg production and egg mass of SPT<sub>50</sub> and SPT<sub>75</sub> had significantly higher than SPT<sub>100</sub>, while feed conversion ratio was signiticantly lower than C (P&lt;0.05). The albumin height, Haught unit, yolk index and shell thickness of all treatments were not significantly different (P&gt;0.05), but the CM gave the lowest egg production, egg mass and yolk color (P&lt;0.05), but the blood parameters of all treatments were not significantly different. Therefore, the SPT could totally replace cassava meal or replace 50 and 75 percentage of ground corn without having any negative effects on egg production, egg quality and hen blood parameters. Besides, the SPT had potential source of color in the yolk similar as corn, and reduced the feed cost by 4.71 baht per kilogram of egg.</p> 2022-05-29T00:00:00+07:00 Copyright (c) 2022 Suitability study of indigenous rice varieties for promoting cultivation in Pathum Thani Province 2021-11-02T15:41:42+07:00 Winakon Theerak Wanida Sumranram Nattapong Chanchula <p> The objective of this research was to evaluate suitability of four indigenous rice species for cultivation in Pathum Thani Province. In this work, growth, yield composition, and nutrition value of the rice were studied. Completely randomized design (CRD) was employed with a total of 400 rice plots; 100 plots for each species, in which 25 of the plots were cultivated with four replications. The species were Hom Dong, Pa-yah Leum Gaeng, Leuang Patew, and Hom Mali. The results showed that Hom Dong and Hom Mali had the best growth; plant height, days to 50% flowering, and days to harvesting, followed by Pa-yah Leum Gaeng and Leuang Patew, respectively. Leuang Patew had the highest number of tiller per plant. In terms of yield composition, Hom Dong and Hom Mali had the highest number of grains per panicle, good seeds per panicle, and grain length, followed by Pa-yah Leum Gaeng and Leuang Patew, respectively. Pa-yah Leum Gaeng had the highest grain weight of 100 grains. There was no significant difference in SPAD index, number of panicles per plant, grain width, and brown rice weight, among the four rice varieties. According to nutrient analysis, Hom Dong had the highest amount of protein. Hom Mali had the least amount of fat, followed by Hom Dong. Hom Mali also had the lowest amount of ash. However, the four rice varieties had no significant amounts in moisture, carbohydrate, calcium, and phosphorus. In conclusion, Hom Dong and Hom Mali were most suitable for promoting cultivation to farmers in Pathum Thani Province, followed by Pa-yah Leum Gaeng which had better growth and yield composition than those of Leuang Patew.</p> 2022-05-29T00:00:00+07:00 Copyright (c) 2022 Effect of Mucona dietary supplementation on semen quality and testosterone level in boars 2021-12-30T11:52:02+07:00 Surangkana Suklerd Em-on Olanratmanee Santikom Srijareon Arrita Kongthip <p><em> Mucuna prureins</em> (L.) DC has an important substance named Levodopa (L-dopa) which has effects on the central nervous system and reproductive system. Therefore, supplementation of <em>M. prureins</em> in animal diets may result in an increase of semen quality. Thus, this experiment aimed to study the influence of the <em>M. prureins</em> dietary supplementation on the reproductive efficiency, through the promotion of semen quality, of boars. Six Large White and 3-crossbred (Large White x Landrace x Duroc) boars with an average age of 8 months were used in this experiment. Animals were divided into 3 groups according to the levels of <em>M. prureins</em> supplementation which are 0, 70 and 140 mg/kg BW. The semen was collected twice per week for 12 weeks. The results showed that <em>M. prureins</em> supplementation at the levels of 70 and 140 mg/kg BW significantly increased semen volume and sperm concentration and reduced abnormal sperm morphology (p&lt;0.05). In addition, testosterone concentration in serum was measured. It was found that boars supplemented with <em>M. prureins</em> had higher serum testosterone content than that were not supplemented (p&lt;0.05). Therefore, dietary supplementation of <em>M. prureins</em> can improve reproductive performance and testosterone level in boars.</p> 2022-05-29T00:00:00+07:00 Copyright (c) 2022 Editorial statement 2022-05-28T18:49:35+07:00 Natthapong Wongdamnern 2022-05-29T00:00:00+07:00 Copyright (c) 2022