Walailak Journal of Science and Technology最新文献_第3页

The Southern Oscillation Index as a Random Walk 作为随机漫步的南方涛动指数

Walailak Journal of Science and Technology Pub Date : 2015-10-12 DOI: 10.14456/VOL13ISS9PP%P

M. Eso, Metta Kuning, Hilary Green, A. Ueranantasun, Somporn Chuai-Aree

{"title":"The Southern Oscillation Index as a Random Walk","authors":"M. Eso, Metta Kuning, Hilary Green, A. Ueranantasun, Somporn Chuai-Aree","doi":"10.14456/VOL13ISS9PP%P","DOIUrl":"https://doi.org/10.14456/VOL13ISS9PP%P","url":null,"abstract":"The Southern Oscillation Index (SOI) has been used as a predictor of variables associated with climatic data, such as rainfall and temperature, and is related to the El Nino and La Nina phenomena, also called the El Nino Southern Oscillation (ENSO). The present study aims to describe the characteristics of the SOI between 1876 and 2014 using statistical methods. The graph of the cumulative monthly SOI in the period 1876 - 2014 shows that the data can be divided into 4 periods. The first period, from 1876 to 1919, shows no trend. An increasing trend is apparent in the second period from 1920 until 1975, while a decreasing trend is apparent in the third period, 1976 to 1995. In the last period, between 1996 and 2014, the SOI appears fairly stable. In order to investigate those trends, the linear regression and autoregressive (AR) model have been fitted. For the linear regression model, the outcome, SOI, is regressed against boxcar function, where the functions model the trends of the SOI. An autoregressive process is used to account for serial correlation in the residuals. The conclusion is that the SOI is quite similar to a random noise process.","PeriodicalId":38275,"journal":{"name":"Walailak Journal of Science and Technology","volume":"13 1","pages":"317-327"},"PeriodicalIF":0.0,"publicationDate":"2015-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66680805","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}

引用次数: 10

Relationship between Poor Sleep Quality and Psychological Problems among Undergraduate Students in the Southern Thailand 泰国南部大学生睡眠质量差与心理问题的关系

Walailak Journal of Science and Technology Pub Date : 2015-06-05 DOI: 10.14456/VOL13ISS3PP%P

W. C. Pensuksan, S. Lertmaharit, V. Lohsoonthorn, T. Rattananupong, Thanawan Sonkprasert, B. Gelaye, M. Williams

{"title":"Relationship between Poor Sleep Quality and Psychological Problems among Undergraduate Students in the Southern Thailand","authors":"W. C. Pensuksan, S. Lertmaharit, V. Lohsoonthorn, T. Rattananupong, Thanawan Sonkprasert, B. Gelaye, M. Williams","doi":"10.14456/VOL13ISS3PP%P","DOIUrl":"https://doi.org/10.14456/VOL13ISS3PP%P","url":null,"abstract":"We conducted this study to fill the noted gap in the available literature by evaluating the prevalence of poor sleep quality in this understudied population and to explore the relationship between sleep quality and psychological problems among undergraduates in Thailand. This study used a cross-sectional survey. Self-administrated questionnaires included the Pittsburgh Sleep Quality Index (PSQI), the Epworth Sleepiness Scale, the Depression, Anxiety and Stress Scale and the Thai General Health Questionnaire. The study group included 1,055 undergraduates, aged 18-25 years. The prevalence of poor sleep quality was 42.4%. Students classified as poor quality sleepers reported significantly more psychological problems, indicating a linear trend of progressively worse global sleep quality associated with greater mood and anxiety symptomatology. Prospective studies that include objective measures of sleep duration and quality are needed to more fully develop focused health promotion strategies for Southeast Asian undergraduates.","PeriodicalId":38275,"journal":{"name":"Walailak Journal of Science and Technology","volume":"13 1","pages":"235-242"},"PeriodicalIF":0.0,"publicationDate":"2015-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66680484","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}

引用次数: 46

Environmental Impact Evaluation of Community Composting by Using Life Cycle Assessment: A Case Study Based on Types of Compost Product Operations 基于生命周期评价的社区堆肥环境影响评价——基于堆肥产品操作类型的案例研究

Walailak Journal of Science and Technology Pub Date : 2015-04-17 DOI: 10.14456/VOL13ISS4PP

R. Aziz, P. Chevakidagarn, S. Danteravanich

{"title":"Environmental Impact Evaluation of Community Composting by Using Life Cycle Assessment: A Case Study Based on Types of Compost Product Operations","authors":"R. Aziz, P. Chevakidagarn, S. Danteravanich","doi":"10.14456/VOL13ISS4PP","DOIUrl":"https://doi.org/10.14456/VOL13ISS4PP","url":null,"abstract":"Life cycle assessment (LCA) was applied to evaluate environmental impacts contributed by 2 community composting systems, consisting of powder and granular compost production. The main raw materials of these composts were waste from agricultural and agro industrial activities, including animal manures, and solid waste from palm oil mills and rice mills. Data from field operations of both of the composting systems were collected and analyzed. Both composting systems were classified into 5 sub systems, consisting of raw material collection, composting process, electricity consumption, material transfer, and distribution of the compost product to consumers. Impact assessments of both composting systems revealed that the composting process sub system was the main contributor on impact categories of acidification potential (AP), eutrophication potential (EP), global warming potential (GWP), and photochemical oxidation potential (POP), while on human toxicity potential (HTP) the distribution sub system was the main contributor. In comparing both systems, it was found that granular compost systems contributed a higher impact than powder compost systems, at 1.1 times on GWP, while the remaining sub systems had almost similar impacts. In order to improve composting systems, it is recommended that compost blanket and fuel substitution be applied, to enable gaseous emission reduction to the composting process and transportation operations. doi: 10.14456/WJST.2016.21","PeriodicalId":38275,"journal":{"name":"Walailak Journal of Science and Technology","volume":"13 1","pages":"221-233"},"PeriodicalIF":0.0,"publicationDate":"2015-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66680501","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}

引用次数: 7

Rheological Behavior of Immiscible PS/LDPE Blends: A Comparative Study of the Palierne Emulsion Model 非混相PS/LDPE共混物的流变行为:Palierne乳液模型的比较研究

Walailak Journal of Science and Technology Pub Date : 2015-02-16 DOI: 10.14456/VOL13ISS1PP

Chatchai Kunyawut, H. E. Hermes

{"title":"Rheological Behavior of Immiscible PS/LDPE Blends: A Comparative Study of the Palierne Emulsion Model","authors":"Chatchai Kunyawut, H. E. Hermes","doi":"10.14456/VOL13ISS1PP","DOIUrl":"https://doi.org/10.14456/VOL13ISS1PP","url":null,"abstract":"The rheological behavior of polystyrene (PS)/low density polyethylene (LDPE) blends have been investigated. Blends with 10, 20 and 30 wt% LDPE were prepared using a co-rotating twin-screw extruder at a melt mixing temperature of 180°C. SEM micrographs revealed that all blends exhibited droplet-type dispersion morphology. Rheological measurements were performed at the same temperature as the mixing temperature. The complex viscosity of the blends laid between those of the PS and the LDPE and decreased with increasing LDPE concentration. The plots of tand of blends with 10 and 20 wt% LDPE suggested that the elasticity of these blends was comparable to that of the pure PS. By contrast, the elasticity behavior of the blend with 30 wt% LDPE was shown to be similar to that of LDPE. Palierne model predictions were in very good agreement with the experimental data for the blends having 10 and 20 wt% LDPE. For the 30 wt% LDPE blend, agreement with the prediction and the experimental data was not as good. Within the frequency range of the rheological measurements, the second plateau at low frequency which results from an increase of the elasticity was not observed in any of the blends studied. This is expected to be due to the long relaxation times of the relatively large LDPE droplets of these blends. doi: 10.14456/WJST.2015.97","PeriodicalId":38275,"journal":{"name":"Walailak Journal of Science and Technology","volume":"12 1","pages":"1157-1169"},"PeriodicalIF":0.0,"publicationDate":"2015-02-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66680425","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}

引用次数: 1

Information Technology Service Management (ITSM) in Education 教育中的信息技术服务管理(ITSM)

Walailak Journal of Science and Technology Pub Date : 2015-01-16 DOI: 10.14456/VOL12ISS11PP

Tapanee Treeratanaporn

引用次数: 47

Traveling Wave Solutions for Fifth Order (1+1)-Dimensional Kaup-Keperschmidt Equation with the Help of Exp(-Phi)-Expansion Method 用Exp(-Phi)展开法求解五阶(1+1)维kap - keperschmidt方程的行波解

Walailak Journal of Science and Technology Pub Date : 2015-01-13 DOI: 10.14456/VOL12ISS7PP

H. Roshid, Md. Nur Alam, M. Akbar

{"title":"Traveling Wave Solutions for Fifth Order (1+1)-Dimensional Kaup-Keperschmidt Equation with the Help of Exp(-Phi)-Expansion Method","authors":"H. Roshid, Md. Nur Alam, M. Akbar","doi":"10.14456/VOL12ISS7PP","DOIUrl":"https://doi.org/10.14456/VOL12ISS7PP","url":null,"abstract":"By using exp(-Phi)-expansion method, abundant exact traveling wave solutions for the fifth order (1+1)-dimensional Kaup-Keperschmidt equation have been obtained in a uniform way. The obtained solutions in this work are imperative and significant for the explanation of some practical physical phenomena. It is shown that the exp(-Phi) -expansion method together with the first order ordinary differential equation, provides a progress mathematical tool for solving nonlinear partial differential equations. Numerical results, together with graphical representation, explicitly reveal the complete reliability and high efficiency of the proposed algorithm. doi: 10.14456/WJST.2015.89 Normal 0 false false false EN-US X-NONE TH /* Style Definitions */ \u0000 table.MsoNormalTable \u0000 {mso-style-name:\"Table Normal\"; \u0000 mso-tstyle-rowband-size:0; \u0000 mso-tstyle-colband-size:0; \u0000 mso-style-noshow:yes; \u0000 mso-style-priority:99; \u0000 mso-style-qformat:yes; \u0000 mso-style-parent:\"\"; \u0000 mso-padding-alt:0cm 5.4pt 0cm 5.4pt; \u0000 mso-para-margin:0cm; \u0000 mso-para-margin-bottom:.0001pt; \u0000 mso-pagination:widow-orphan; \u0000 font-size:10.0pt; \u0000 font-family:\"Times New Roman\",\"serif\"; \u0000 mso-fareast-font-family:\"Times New Roman\"; \u0000 mso-bidi-font-family:\"Angsana New\";}","PeriodicalId":38275,"journal":{"name":"Walailak Journal of Science and Technology","volume":"12 1","pages":"1063-1073"},"PeriodicalIF":0.0,"publicationDate":"2015-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66680286","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}

引用次数: 3

TB Treatment with DOT: RCT vs. Effective Program Management 用DOT治疗结核病:随机对照试验与有效的项目管理

Walailak Journal of Science and Technology Pub Date : 2015-01-05 DOI: 10.14456/VOL12ISS5PP

Phanchai Rattanasuwan

引用次数: 33

New Exact Solutions for Isothermal Magnetostatic Atmosphere Equations 等温静磁大气方程的新精确解

Walailak Journal of Science and Technology Pub Date : 2014-12-23 DOI: 10.14456/VOL12ISS6PP

M. Attia, A. Elhanbaly, M. A. Abdou

引用次数: 2

Experimental analysis and energetic evaluation for Mahua oil methyl ester with diethyl ether. 麻花油二乙醚甲酯的实验分析及能量评价。

Walailak Journal of Science and Technology Pub Date : 2014-11-05 DOI: 10.14456/VOL12ISS10PP

Bhanu Pratap Singh, A. Sharma

引用次数: 1

Phytochemical Constituents in Leaves and Callus of Ficus deltoidea Jack var. Kunstleri (King) Corner 三角榕叶片和愈伤组织的化学成分研究

Walailak Journal of Science and Technology Pub Date : 2014-11-04 DOI: 10.14456/VOL12ISS4PP

Zakiah Musapha, H. Harun

引用次数: 5