检索结果-南通市图书馆

Journal of Harbin Institute of Technology（New series） 2020年

作者： Adel Elgadi Chan Mieow Kee Tan Yong Chai Center for Advanced Materials Research and Manufacturing Processes， Faculty of Engineering and the Built Environment， segi university

Low thermal conductivity of binary fatty acid mixture of palmitic and lauric acids （PA-LA） within the value range of 0.15 – 0.17 W/（m·K） restricts its wide utilization as thermal energy storage material in the active regime of solar heating applications at low operating temperatures. Nevertheless， this mixture as phase change material （PCM） has a suitable phase-change temperature and heat of 36 ℃ and 176.3 J/g， respectively. Hence， the objective of this study is to formulate a novel form-stable composite PCM with the PA-LA mixture and expanded graphite （EG） as a thermal enhancer. PA-LA eutectic mixture with varied concentrations of EG was prepared and characterized. The thermal conductivity of PA-LA/EG increased gradually with the mass of EG. Optimum thermal properties were observed in PA-LA/（5% EG） composite， where its melting (Tm)， freezing temperature (Tf)， latent melting heat and thermal conductivity was 35.53 ℃， 34.84 ℃， 174 J/g， and 1.19 W/（m·K）， respectively. Also， the composite PCM is characterized by good chemical-thermal stability and thermal reliability for long-term usage. In conclusion， it can be utilized as a prospective form-stable PCM for thermal energy storage in solar heating systems， overheat treatment systems， and other thermal storage applications at low operating temperatures.

关键词：

Preliminary Investigation of Copper Joints Soldered with Sn58Bi

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Harbin Institute of Technology（New series） 2020年

作者： Amares Singh Teow Sinn Khai Rajkumar Durairaj Amer Ahmed Qassem Saleh Center for Advanced Materials Research and Manufacturing Processes， segi university Lee Kong Chian Faculty of Engineering and Science， university Tunku Abdul Rahman

In recent years， intensive studies have been carried out to find an alternative for Tin （Sn）-Lead （Pb） solder alloys with increasing demand over lower temperature solder alloys in current electronic packaging industry. High temperature operational solder alloys seem to produce drawback to other components on the printed circuit board （PCB）. Low melting temperature Sn58Bi substrate as a potential replacement was investigated in this paper based on the melting properties， wettability， and shear strength. The Sn58Bi was soldered at a temperature below 200 ℃ on the Cu substrate and the shear strength and contact angle were calculated. A peak temperature (melting temperature， TM) of 144.83 ℃ was identified. Single lap joint method was performed at a strain rate of 0.1 mm/min and an average shear strength of 23.4 MPa was found from three samples. The contact angle （wettability） was calculated to study the solder joint behaviour at reflow temperature of 170 ℃. The contact angle of the Sn58Bi was found to be 32.4 ° and considered to be desired value since the angle is less than 50 °. These low temperature soldering provides a preliminary result to allow further application on the real PCB.

关键词：

Development of Cloud Movement Prediction Method for Solar Photovoltaic System

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Harbin Institute of Technology（New series） 2020年

作者： Fei Lu Siaw Yaw Yoong Sia Mallikarachchi Dilshani Centre for Advanced Electrical and Electronic Systems （CAEES）， Faculty of Engineering， Built Environment and Information Technology， segi university， Kota Damansara

Variability of power generation due to the prevalence of cloud cover over solar photovoltaics （PV） power plants is a challenge faced by grid operators and independent system operators （ISOs） in the integration of solar energy into the grid. Solar forecasts generated through ground-based sky imaging systems are useful for short-term cloud motion predictions. However， the cost of sky imaging systems currently available in industries are relatively high. Hence， a ground-based camera system utilizing a simple webcam is proposed in this study. The proposed method can produce predictions with high levels of accuracy. Forecasts were generated through video analysis using MATLAB for the computation of cloud motion predictions. The image processing involved in the implementation of the proposed system is based on the detection of cloud regions in the form of a cluster of white pixels within individual frames and tracking their motion through comparison of subsequent frames. This study describes the techniques and processes used in the development of the proposed method， along with the evaluation of performance through analysis of the results. The predictions were carried out over multiple time horizons. The time horizons selected include 5， 10， 15， 20， 25， and 30 s. The overall results computed showed promising accuracy levels above 94.60%， which makes it adequate for generating reliable forecasts.

关键词：

English as Foreign Language(EFL)Teachers’Efficacy and Positive Achievement Emotions:Relations to Instructional Changes After Attending a Study Abroad Program

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of International Education and Practice 2022年第2期5卷 29-37页

作者： Xue Zhang Nor Azian Binti Md.Noor Popoola Kazem Hamed Department of Foreign Language Anhui Polytechnic UniversityWuhuAnhuiChina Department of Education Segi University Sdn.Bhd.Kota DamansaraMalaysia Department of Education Al-Madinah International UniversityDesa PetalingMalaysia

Due to government policy,the number of study abroad professional development program for EFL teachers increased greatly in China during recent *** abroad program aims to help EFL teachers improve their knowledge and teaching practices,which requires them to make adjustments to their traditional teaching styles ***,teachers may experience strong emotional reactions when they are faced with different modes of teaching *** the perspective of“emotion”,this study used control-value theory of achievement emotions as the theoretical framework to examine the relationship between teacher efficacy,positive achievement emotions,and instructional changes among 386 Chinese EFL teachers who attended study abroad *** sampling was used in data *** analysis was conducted using Structural Equation Model(SEM).The results showed that teacher efficacy correlated positively with positive achievement emotions(enjoyment,hope,and pride)and instructional *** achievement emotions mediated the relationship between teacher efficacy and instructional *** showed the impact of teacher efficacy and positive achievement emotions on changes in teachers’thinking and instructional *** on the findings and limitations of this study,implications on teacher education and professional development program,directions and suggestions for future studies are discussed.

关键词： Teacher efficacy Achievement emotions EFL teacher Study abroad

Comparative efficacy of ChatGPT 3.5,ChatGPT 4,and other large language models in gynecology and infertility research

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Gynecology and Obstetrics Clinical Medicine 2023年第4期3卷 203-206页

作者： Pallav Sengupta Sulagna Dutta Srikumar Chakravarthi Ravindran Jegasothy Ravichandran Jeganathan Anuradha Pichumani College of Medicine Gulf Medical UniversityAjmanUnited Arab Emirates School of Medical Sciences Bharath Instute of Higher Education and ResearchTNIndia Faculty of Medicine SEGi UniversityKota DamansaraMalaysia Faculty of Medicine MAHSA UniversityJenjaromMalaysia Department of Obstetrics&Gynaecology Hospital Sultanah AminahJohor BahruMalaysia Sree Renga Hospital ChengalpattuTamil NaduIndia

Dear Editor,As experts in gynecology and infertility research,we have witnessed the rapid advancement of artificial intelligence(Al)technologies,particularly language models,which have greatly improved their *** this communication,we aim to compare the proficiency of advanced language models,such as Chat Generative Pre-Trained Transformer(ChatGPT)3.5,ChatGPT 4,and others,in relation to our field.

关键词： language such Chat

Generation of OAM Waves and Analysis of Mode Purity for 5G Sub-6 GHz Applications

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Computers, Materials & Continua 2023年第1期74卷 2239-2259页

作者： Shehab Khan Noor Arif Mawardi Ismail Mohd Najib Mohd Yasin Mohamed Nasrun Osman Nurulazlina Ramli Ali H.Rambe J.Iqbal Advanced Communication Engineering(ACE) Centre of ExcellenceFaculty of Electronic Engineering TechnologyUniversiti Malaysia PerlisKangarPerlisMalaysia Centre for Advanced Electrical&Electronic System(CAEES)Faculty of Engineering Built Environment and Information TechnologySEGi University Petaling JayaSelangorMalaysia Department of Electrical Engineering Universitas Sumatera UtaraMedan20155Indonesia School of Electrical and Electronic Engineering Engineering CampusUniversiti Sains MalaysiaNibong Tebal14300PenangMalaysia Faculty of Engineering&Technology Gomal University29050 kpkPakistan

This article presents the generation of Orbital AngularMomentum(OAM)vortex waves with mode 1 using Uniform Circular Array(UCA)*** different designs,namely,UCA-1(4-element array antenna)and UCA-2(8-element array antenna),were designed and fabricated using FR-4 substrate to generate OAM mode 1 at 3.5 GHz(5G mid-band).The proposed antenna arrays comprised rectangular microstrip patch elements with inset fed *** elements were excited by a carefully designed feeding phase shift network to provide similar output energy at output ports with desired phase shift *** generated OAM waves were confirmed by measuring the null in the bore sight of their 2D radiation patterns,simulated phase distribution and intensity *** measurement results agree well with the simulation ***,a detailed mode purity analysis of the generated OAM waves was carried out considering different *** investigation found that the greater the number of elements,the higher the purity of the generated OAM *** with other previous works,the proposed antenna design of this paper is very simple to design and *** addition,the proposed antennas are compact in design even at lower frequency band with very wide bandwidth to meet the requirements of 5G mid-band applications.

关键词： Orbital angular momentum vortex waves fifth generation wireless communications uniform circular array antenna patch antenna

产教融合背景下基于工作室模式多元协同育人机制探究

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

现代职业教育 2024年第31期 97-100页

作者：毛伟山西工程科技职业大学 segi University

为响应新时代职业教育改革要求，推动学生职业能力和思想政治教育的双重提升，基于工作室模式，探讨多元协同育人机制的构建与实践，通过专业教师、企业导师和辅导员的协同合作，形成了“一引擎双主体三化四角色”的育人模式，强化党建... 详细信息

为响应新时代职业教育改革要求，推动学生职业能力和思想政治教育的双重提升，基于工作室模式，探讨多元协同育人机制的构建与实践，通过专业教师、企业导师和辅导员的协同合作，形成了“一引擎双主体三化四角色”的育人模式，强化党建引领和校企合作，将会计职业文化、数智晋商文化和地域红色文化有机融合，助力学生在“学生→学徒→准员工→员工”的角色转变中获得全面发展，为职业教育改革探索出一条创新之路。

关键词：产教融合职业教育工作室模式协同育人

来源：博看期刊

在线全文

学校读者我要写书评

暂无评论

蹴鞠一梦

电影文学 2021年第6期 191-192页

作者：孟祥梁(编剧) 周云飞(编剧) 中国教育学会山东省青年作家协会临沂大学传媒学院与马来西亚segi university

1.内景齐都文化体育足球场日足球场内,7号李峰正准备射门,这一脚是属于他的"十二码",也是这场2∶2平局下的最后一分钟赛事。双方的球员剑拔弩张,防守李峰的对方门将更是紧张得手心冒汗。李峰注视着球门,想起了和教练的对话。2.内景球员... 详细信息

1.内景齐都文化体育足球场日足球场内,7号李峰正准备射门,这一脚是属于他的"十二码",也是这场2∶2平局下的最后一分钟赛事。双方的球员剑拔弩张,防守李峰的对方门将更是紧张得手心冒汗。李峰注视着球门,想起了和教练的对话。2.内景球员休息室门口日(闪回)教练:李峰,能不能顺利保送进省足球队,就看这场比赛了。李峰:教练,我会竭尽全力的,我先回队了。

关键词：足球场内景教练

维普期刊数据库

在线全文

学校读者我要写书评

暂无评论

互联网流量分布趋势研究

通信世界 2022年第12期 36-39页

作者：马蕴颖梁汗臣中国电信集团公司政企信息服务事业群 segi university

根据今年2月25日CNNIC发布的数据,截至2021年12月,我国互联网网民规模达10.32亿人,互联网普及率达73.0%,人均每周上网时长为28.5小时。面对如此高的普及率和上网时长,人们很自然地想到:网民普及率会不会继续提高,上网时长会不会继续增长... 详细信息

根据今年2月25日CNNIC发布的数据,截至2021年12月,我国互联网网民规模达10.32亿人,互联网普及率达73.0%,人均每周上网时长为28.5小时。面对如此高的普及率和上网时长,人们很自然地想到:网民普及率会不会继续提高,上网时长会不会继续增长,中国的互联网能不能承担这么大的流量?本文通过对互联网流量的参与主体、影响因素进行分析和论述,尝试厘清一些内在的规律,解答上述问题并为后续策略的制定提供参考。

关键词：互联网 CNNIC 参与主体上网时长分布趋势普及率

维普期刊数据库博看期刊

Higher Order OAM Mode Generation Using Wearable Antenna for 5G NR Bands

在线全文

学校读者我要写书评

暂无评论

Computer Systems Science & Engineering 2023年第10期47卷 537-551页

作者： Shehab Khan Noor Arif Mawardi Ismail Mohd Najib Mohd Yasin Mohamed Nasrun Osman Thennarasan Sabapathy Shakhirul Mat Salleh Ping Jack Soh Ali Hanafiah Rambe Nurulazlina Ramli Advanced Communication Engineering(ACE) Centre of ExcellenceFaculty of Electronic Engineering&TechnologyUniversiti Malaysia PerlisKangarPerlisMalaysia Faculty of Engineering Technology(FTK) Department of Electronic Engineering TechnologyUniversiti Malaysia Perlis(UniMAP)Unicity Alam Campus02100Padang BesarPerlisMalaysia Centre for Wireless Communications(CWC) University of Oulu90570OuluFinland Department of Electrical Engineering Universitas Sumatera UtaraMedan20155Indonesia Centre for Advanced Electrical and Electronic System(CAEES)Faculty of Engineering Built Environment and Information TechnologySEGi University SelangorMalaysia

This paper presents a flexible and wearable textile array antenna designed to generate Orbital Angular Momentum(OAM)waves with Mode+2 at 3.5 GHz(3.4 to 3.6 GHz)of the sub-6 GHz fifth-generation(5G)New Radio(NR)*** proposed antenna is based on a uniform circular array of eight microstrip patch antennas on a felt textile *** contrast to previous works involving the use of rigid substrates to generate OAM waves,this work explored the use of flexible substrates to generate OAM waves for the first *** than that,the proposed antenna was simulated,analyzed,fabricated,and tested to confirm the generation of OAMMode+*** the same design,OAM Mode−2 can be generated readily simply by mirror imaging the feed *** that the proposed antenna operated at the desired frequency of 3.5 GHz with an overall bandwidth of 400 MHz in free ***,mode purity analysis is carried out to verify the generation of OAM Mode+2,and the purity obtained was 41.78%at free space flat ***,the effect of antenna bending on the purity of the generated OAM mode is also ***,the influence of textile properties on OAM modes is examined to assist future researchers in choosing suitable fabrics to design flexible OAM-based *** a comprehensive analysis considering different factors related to wearable applications,this paper demonstrates the feasibility of generating OAMwaves using textile ***,as per the obtained Specific Absorption Rate(SAR),it is found that the proposed antenna is safe to be *** findings of this work have a significant implication for body-centric communications.

关键词： Wearable antenna OAM vortex waves 5G textile antenna microstrip patch antenna specific absorption rate(SAR)