King Mongkut’s University of Technology North Bangkok International Journal of Applied Science and Technology最新文献

{"title":"Transesterification of Biodiesel by Molecular Modeling and Simulation","authors":"Wimonmas Masomboon, Thanita Sonthisawate, Pirawat Thongjun, T. Srinophakun","doi":"10.14416/J.IJAST.2014.11.001","DOIUrl":"https://doi.org/10.14416/J.IJAST.2014.11.001","url":null,"abstract":"Transesterification of alkyl esters plays an important role in biodiesel production, and a critical substance in this mechanism is triacylglycerol. A molecular modeling technique is used in this study to determine the geometrical parmeters of triacylglycerol via semi-empirical AM1, PM3 and ab initio HF/6-31G with the GaussView 03W and GAUSSAIN 03W pieces of software. The results obtained from these three models showed that the geometrical parameters of the triacylglycerol molecules are in the same range. Hence, these molecular models can be used in the simulation of the transesterification mechanism. There are six possible mechanisms for the biodiesel transesterifications. Each type of mechanism contains six reaction steps. Using the B3LYP/6-31G//PM3 method, the transesterification mechanism was simulated to determine the best possible pathway.","PeriodicalId":352801,"journal":{"name":"King Mongkut’s University of Technology North Bangkok International Journal of Applied Science and Technology","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127109678","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effects of Ground Grid Configuration of Two Neighbouring Distribution Substations on Ground Potential Rise in MEA’s Power System","authors":"A. Phayomhom, S. Sirisumrannukul, Apinan Vigittomrongsak, Tawiwat Roopkaew, B. Ainsuk","doi":"10.14416/J.IJAST.2014.10.002","DOIUrl":"https://doi.org/10.14416/J.IJAST.2014.10.002","url":null,"abstract":"This paper presents construction planning procedures for a new small (temporary) or permanent distribution substation to replace an existing distribution substation that is served as a small or permanent substation to supply the load of the existing distribution substation while it has not yet been removed. In the meantime when the ground grids of the two substations are electrically disconnected, the auxiliary grounding system of the existing distribution substation can create steep ground potential rise between the ground grids of the two substations and hence introduces a risk for those who are working nearby. It is therefore important to incorporate safety criteria described in terms of step and touch voltage into electrical designs without any potential electrical hazards. Modeling and simulation is carried out on the Current Distribution Electromagnetic interference Grounding and Soil structure (CDEGS) program. A sequential transition process from the existing distribution substation to a new distribution substation is suggested to comply with the IEEE standard 80-2000. The results in this paper could be served a guideline in grounding system design of distribution substation and modification of grounding standards in MEA’s power distribution system.","PeriodicalId":352801,"journal":{"name":"King Mongkut’s University of Technology North Bangkok International Journal of Applied Science and Technology","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124251954","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Assessment of Probiotic Properties in Lactic Acid Bacteria Isolated from Fermented Vegetables","authors":"Wanticha Savedboworn, Wiboon Riansa-ngawong, Warinyaporn Sinlapacharoen, Sirinun Pajakang, Bensiya Patcharajarukit, Sriwiang Tipkanon","doi":"10.14416/J.IJAST.2014.10.001","DOIUrl":"https://doi.org/10.14416/J.IJAST.2014.10.001","url":null,"abstract":"The present study was conducted in order to screen lactic acid bacteria which have the probiotic properties. A total of 82 isolates of lactic acid bacteria was preliminarily screened from fermented vegetables. Most strains exhibited autoaggregation ability, cell surface hydrophobicity and antimicrobial activity against food-borne pathogens Escherichia coli O157:H7 DMST 12743 and Salmonella Typhimurium ATCC 13311. The results revealed that 23 isolates possess some desirable probiotic properties and selected to determine other probiotic properties including antibiotic resistance, coaggregation ability with E. coli O157:H7 DMST 12743 and S. Typhimurium ATCC 13311, heat tolerance at 65 ° C for 60 min and the ability to survive under gastrointestinal tract condition pH 2.0 and 8.0. From probiotic properties determination mentioned above, it was observed that the strain KMUTNB 5-9, KMUTNB 5-36 and KMUTNB 6-21 were found to meet all the criteria and could be considered as potential probiotic. The identification of the strains based on 16S rDNA sequencing analysis indicated that the strain KMUTNB 5-9, KMUTNB 5-36 and KMUTNB 6-21 were identified to be Pediococcus pentosaceus.","PeriodicalId":352801,"journal":{"name":"King Mongkut’s University of Technology North Bangkok International Journal of Applied Science and Technology","volume":"87 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130538349","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Response Surface Methodology for Optimization of Biodiesel Production by Acinetobacter baylyi","authors":"M. Sriariyanun","doi":"10.14416/J.IJAST.2014.09.003","DOIUrl":"https://doi.org/10.14416/J.IJAST.2014.09.003","url":null,"abstract":"Biodiesel is conventionally produced through the transesterification reaction of alcohol and triacylglycerols (TAG). TAGs are obtained from oilseed plants, and animal fats, therefore the limited supply of TAG is the major bottleneck of the biodiesel production. in vivo esterification between fatty acid acyl-CoA and alcohol to produce FAAE is an alternative choice for biodiesel production. In this study, FAAE production by Acinetobacter baylyi was optimized using response surface methodology. The optimization process employed a Box- Behnken design, where the investigated variables were carbon source content, nitrogen source content, and shaking speed. Here, the value of the regression coefficient R 2 = 0.8255 could be explained by the model which is high to advocate the significance of the model. The maximum FAEE yield, 1,026.6 mg/L, was obtained. It could be concluded that in vivo FAEE synthesis using A. baylyi as material is a novel way for the biodiesel production.","PeriodicalId":352801,"journal":{"name":"King Mongkut’s University of Technology North Bangkok International Journal of Applied Science and Technology","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116880111","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Morphology and Crystallization of Polypropylene/Microfibrillated Cellulose Composites","authors":"S. Thanomchat, K. Srikulkit, B. Suksut, A. Schlarb","doi":"10.14416/J.IJAST.2014.09.002","DOIUrl":"https://doi.org/10.14416/J.IJAST.2014.09.002","url":null,"abstract":"Microfibrillated cellulose (MFC) was prepared by controlling the re-precipitation of cellulose prepared in the mixture form of NaOH/Urea solubilized microcrystalline cellulose (MCC) and starch. The cellulose re-precipitation was carried-out in an HCl bath, resulting in a MFC form having relatively lower crystallinity than MCC. The XRD pattern of MFC indicated the partially crystalline structure arising from the imperfect orientation of a cellulose chain obstructed by a starch molecule in the precipitation step. Interestingly, the MFC morphology exhibited a web-like structure with a diameter in the range of 10-20 nm. The water retention value of MFC was extraordinarily high due to its extremely small diameter having high surface area. Further, surface silanization of MFC with organosilane was carried out. Then, the modified MFC was melt-mixed with polypropylene (PP) matrix via a simple melt mixing technique. The morphology and crystallization of the PP/MFC composites were measured. The morphology of organosilane treated MFC exhibited agglomeration of 10 microns in diameter with layered structures arising from the packing of microfibrils. The FTIR spectra showed hydrophobic characteristics of treated MFC observed by the disappearance of original cellulose hydroxyl group and bound water. The crystallinity of treated MFC increased when compared to the untreated MFC, indicating that cellulose chains of unmodified MFC underwent re-orientation occurring in the modification step due to its high crystallinity characteristic. For the PP/MFC-composite containing MFC loading, faster crystallization and higher spherulite growth rate, in case of higher MFC loading, were observed. In addition, the spherulite size decreased with an increase in the crystallization temperature. However, the degree of crystallinity was fairly independent on the MFC-loading. Therefore it can be concluded that the addition of MFC might enable shorter cycle times, resulting in cheaper processing cost in a view point of polymer processing.","PeriodicalId":352801,"journal":{"name":"King Mongkut’s University of Technology North Bangkok International Journal of Applied Science and Technology","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134192697","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Advanced Measurement, Characterization and Simulation of Thermoplastic Composite Induction Welding","authors":"Yun Wan, Steven Liu, M. Hümbert, M. Duhovic, P. Mitschang","doi":"10.14416/J.IJAST.2014.09.001","DOIUrl":"https://doi.org/10.14416/J.IJAST.2014.09.001","url":null,"abstract":"Induction welding is a highly versatile thermoplastic composite (TPC) and hybrid material (metal to composite) fusion bonding process which uses electromagnetic phenomena to generate contact-free heating of the joining partners. Two highly influential sets of parameters in the process are the ‘actual’ applied coil current amplitude and frequency along with the temperature and frequency dependent electrical conductivity behavior of the joining materials. Both sets of data are not easily measurable and may change dynamically during the process. One of these issues can be addressed from an electrical engineering point of view, which focusses on the induction heating equipment itself and accurate measurement of the electrical behavior of the induction heating circuit. Magnetoresistive sensors especially designed for high-frequency current measurement can be used to measure the coil current and its corresponding waveform for any welding setup. The data recorded by the sensor board, together with Fourier Transform analysis techniques, provides accurate values for the coil current and frequency, which can then be used for process and equipment design simulations assisting in the development of suitable control systems and overall process optimization.","PeriodicalId":352801,"journal":{"name":"King Mongkut’s University of Technology North Bangkok International Journal of Applied Science and Technology","volume":"267 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132706137","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Potential Activity Evaluation of CoMo/Al2O3-TiO2 Catalysts for Hydrodesulfurization of Coprocessing Bio-oil","authors":"R. Yeetsorn, S. Tungkamani, S. Yoshikazu","doi":"10.14416/J.IJAST.2014.08.002","DOIUrl":"https://doi.org/10.14416/J.IJAST.2014.08.002","url":null,"abstract":"This research evaluated a catalyst activity for hydrodesulfurization (HDS) of a petroleum fraction and the mixture of partially hydrodeoxygenated bio-oil (HBO), which was hydrodeoxygenated woody tar (HWT) and the petroleum fraction, which was light gas oil. As results, 340oC of reaction temperature and 2 hours of reaction period provide positive influence on the catalyst activity. Oxygen and nitrogen compounds in bio-oil exhibit an inhibiting effect on the HDS. Synthesized catalysts supported on titanium-rich and pure titania carriers indicate higher activity than those supported on pure alumina, since TiO 2 acts as an electronic promoter in catalysts. The electronic promotion of Mo by Ti has a limitation, accordingly, 310CoMoAT (1:0.75) catalyst presents the best catalytic behavior. The approach from this research can contribute a direction for further improvement of co-processing bio-oil productions as a sustainable fuel invention.","PeriodicalId":352801,"journal":{"name":"King Mongkut’s University of Technology North Bangkok International Journal of Applied Science and Technology","volume":"80 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114476446","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Benefits and Drawbacks of Model-based Design","authors":"A. Bergmann","doi":"10.14416/j.ijast.2014.04.004","DOIUrl":"https://doi.org/10.14416/j.ijast.2014.04.004","url":null,"abstract":"The Model-based Design approach, as propagated by The MathWorks, is a state-of-the-art method in the fields of aerospace, defense and automotive developments. The obvious advantages of Model-based Design of a convenient, understandable graphical description of systems, continuous verification and validation at all stages of development as well as its inherent robustness against coding errors have made it a state-of-the-art method in fields such as automotive systems and aerospace and defense. Despite the vast number of success stories associated with this approach, Model-based Design is not a standard method throughout the entire industry, especially not for small and medium sized enterprises. Hence, consulting on the introduction of Model-based Design into development teams is a recurring task for the author. Presenting an industrial project, the development of a velocimeter (spatial frequency sensor system), benefits as well as obstacles corresponding to Model-based Design are introduced. The paper’s object is giving detailed insight into the method based on first-hand experience. It will be concluded that Model-based Design is a favorable approach even for small and medium sized enterprises.","PeriodicalId":352801,"journal":{"name":"King Mongkut’s University of Technology North Bangkok International Journal of Applied Science and Technology","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116968245","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Growth and Survival Rates of Lactobacillus plantarum in Thai Cereal Cultivars","authors":"Wanticha Savedboworn, R. Charoen, Kriangkrai Phattayakorn","doi":"10.14416/J.IJAST.2014.07.005","DOIUrl":"https://doi.org/10.14416/J.IJAST.2014.07.005","url":null,"abstract":"In this study, the viability of probiotic Lactobacillus plantarum TISTR 2075 in different kind of cereal extracts was determined during fermentation and storage. During storage at 4°C for 144 h, fermented Plai Ngahm Prachin Buri rice extract exhibited the highest survival rate of 94.91% which was significant difference (P<0.05) from other fermented cereal extracts. Whereas, the highest survival rate of the strain stored at 37°C for 60 h was detected in fermented black glutinous rice extract (83.40% survival rate). Furthermore, the stability of the strain could be considered in a term of the specific rate of degradation (k). The lowest k value of 0.0034 h-1 and 0.0181 h-1 was also observed in fermented Plai Ngahm Prachin Buri rice extract storage at 4°C and fermented black glutinous rice extract storage at 37°C, respectively. Total reducing sugar and free amino nitrogen evolution of all fermented cereal extracts decreased over the course of storage period.","PeriodicalId":352801,"journal":{"name":"King Mongkut’s University of Technology North Bangkok International Journal of Applied Science and Technology","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133640550","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"An Overview of Cell Zooming Algorithms and Power Saving Capabilities in Wireless Networks","authors":"Khin Cho Tun, K. Kunavut","doi":"10.14416/J.IJAST.2014.07.004","DOIUrl":"https://doi.org/10.14416/J.IJAST.2014.07.004","url":null,"abstract":"Cell zooming has emerged as a potential strategy to develop a green communication system in our society and it has become an essential research area of wireless communication. Aiming to highlight the trend of existing cell zooming algorithms and their power saving capabilities, this paper reviews a number of cell zooming algorithms that have been proposed in the literature. Static cell zooming algorithms are effective for off-peak hours and their maximum power saving capability is 50% since off-peak duration is typically not more than 12 hours.Meanwhile dynamic cell zooming algorithms are applicable in full-day operation and they are useful not only for power saving but also for load balancing. However, on/off switching delay, signalling overhead due to traffic information exchange and how to attain information of traffic spatial distribution are existing challenges in dynamic cell zooming algorithms. One noticeable point is that relative power saving in dynamic cell zooming algorithm is less than 50% if traffic spatial distribution is considered. Since location management (LM) was designed for effectively servicing to customers, further researches could lead to work on location management (LM) based cell zooming algorithms for both effective servicing and energy saving.","PeriodicalId":352801,"journal":{"name":"King Mongkut’s University of Technology North Bangkok International Journal of Applied Science and Technology","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121380314","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}