检索结果-南通市图书馆

Stagnation Point Flow Over a Permeable Stretching/Shrinking Sheet with Chemical Reaction and Heat Source/Sink

在线全文

学校读者我要写书评

暂无评论

Computer Modeling in Engineering & Sciences 2019年第7期120卷 203-214页

作者： Izyan Syazana Awaludin anuar Ishak Ioan Pop Faculty of Management Multimedia University63100 CyberjayaSelangorMalaysia School of Mathematical Sciences Faculty of Science and TechnologyUniversiti Kebangsaan Malaysia43600 UKM BangiSelangorMalaysia Department of Mathematics Babes-Bolyai University400084 Cluj-NapocaRomania

The present study considers the magnetohydrodynamic(MHD)stagnation point flow with chemical reaction effect over a permeable stretching/shrinking *** partial differential equations are reduced to a set of ordinary differential equations using a similarity *** transformed equations are then solved numerically by employing the bvp4c function available in the MATLAB *** numerical results illustrate the effects of several parameters on the skin friction coefficient,local Nusselt number and the local Sherwood *** solutions are obtained for a certain range of *** temporal stability analysis is carried out to determine which one of these solutions is stable and thus physically reliable in a long run.

关键词： Shrinking dual solutions stability stagnation flow

Exploring Students Engagement Towards the Learning Management System (Lms) Using Learning Analytics

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Computer Systems Science & Engineering 2021年第4期37卷 73-87页

作者： shahrul Nizam Ismail Suraya Hamid Muneer Ahmad A.Alaboudi Nz Jhanjhi Department of Information Systems Faculty of Computer Science&Information TechnologyUniversity MalayaKuala Lumpur50603Malaysia Department of Information systems College of Computer and Information SciencesShaqra UniversitySaudi Arabia School of Computer Science and Engineering SCETaylor’s UniversitySubang Jaya47500Malaysia

Learning analytics is a rapidly evolving research discipline that uses theinsights generated from data analysis to support learners as well as optimize boththe learning process and environment. This paper studied students’ engagementlevel of the Learning Management System (Lms) via a learning analytics tool,student’s approach in managing their studies and possible learning analytic methods to analyze student data. Moreover, extensive systematic literature review(SLR) was employed for the selection, sorting and exclusion of articles fromdiverse renowned sources. The findings show that most of the engagement inLms are driven by educators. Additionally, we have discussed the factors inLms, causes of low engagement and ways of increasing engagement factorsvia the Learning Analytics approach. Nevertheless, apart from recognizing theLearning Analytics approach as being a successful method and technique for analyzing the Lms data, this research further highlighted the possibility of mergingthe learning analytics technique with the Lms engagement in every institution asbeing a direction for future research.

关键词： Learning analytics student engagement learning management system systematic literature review

Developing Engagement in the Learning Management System Supported by Learning Analytics

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Computer Systems Science & Engineering 2022年第7期42卷 335-350页

作者： Suraya Hamid shahrul Nizam Ismail Muzaffar Hamzah Asad W.Malik Department of Information System Faculty of Computer Science and Information TechnologyUniversiti MalayaKuala LumpurMalaysia Faculty of Computing and Informatics Universiti Malaysia SabahSabahMalaysia Department of Computing School of Electrical Engineering and Computer Science(SEECS)National University of Sciences and Technology(NUST)IslamabadPakistan

Learning analytics is an emerging technique of analysing student par-ticipation and *** recent COVID-19 pandemic has signiﬁcantly increased the role of learning management systems(Lmss).Lmss previously only complemented face-to-face teaching,something which has not been possible between 2019 to *** date,the existing body of literature on Lmss has not analysed learning in the context of the pandemic,where an Lms serves as the only interface between students and ***,productive results will remain elusive if the key factors that contribute towards engaging students in learning are notﬁrst identiﬁ***,this study aimed to perform an exten-sive literature review with which to design and develop a student engagement model for holistic involvement in an *** required data was collected from an Lms that is currently utilised by a local Malaysian *** model was validated by a panel of experts as well as discussions with *** is our hope that the result of this study will help other institutions of higher learning determine factors of low engagement in their respective Lmss.

关键词： Engagement analysis learning analytics learning management system student engagement

高特异性σ2R/TMEM97配体FEM-1689可减轻神经病理性疼痛并抑制整合应激反应

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

中国疼痛医学杂志 2024年第3期30卷 161-165页

作者：龙沙沙(译) 韩清见(校) 复旦大学脑科学研究院

在药理学界,σ2受体(σ2R)早在30多年前就被描述过,但其分子特征仍模糊不清,直到最近才被确认为跨膜蛋白97 (TMEM97)。经研究证明σ_(2)R/TMEM97配体可减轻小鼠神经病理性疼痛模型的机械超敏反应,其最大抗痛作用的时间为给药后24 h。该... 详细信息

在药理学界,σ2受体(σ2R)早在30多年前就被描述过,但其分子特征仍模糊不清,直到最近才被确认为跨膜蛋白97 (TMEM97)。经研究证明σ_(2)R/TMEM97配体可减轻小鼠神经病理性疼痛模型的机械超敏反应,其最大抗痛作用的时间为给药后24 h。该研究试图通过解决2个关键问题来了解其抗神经病理性疼痛效应:σ_(2)R/TMEM97化合物是否通过受体选择性地发挥作用,以及它们对痛觉神经元的下游机制是什么?该研究使用了一种Tmem97全身基因敲除小鼠,发现σ_(2)R/TMEM97结合化合物FEM-1689,需要该基因才能在小鼠神经损伤模型中产生抗痛作用。利用小鼠背根神经节原代神经元证明,FEM-1689能抑制整合应激反应(ISR),并通过σ_(2)R/TMEM97特异性作用促进神经元生长。随后,该研究扩展了其临床转化价值,证明FEM-1689可降低人类感觉神经元中的整合应激反应(ISR)和p-eIF2α水平,并可减轻甲基乙二醛对ISR的致病作用。同时,研究还证明了σ_(2)R/TMEM97在人类痛觉感受器和卫星胶质细胞中均有表达。这些结果证实了σ_(2)R/TMEM97有希望成为治疗神经病理性疼痛的靶点。

关键词：抗痛作用特异性作用受体选择性痛觉感受器甲基乙二醛神经病理性疼痛痛觉神经高特异性

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2010年第2期17卷 149-153页

作者： anuar Ishak Nor Azizah Yacob Roslinda Nazar Ioan Pop School of Mathematical Sciences Faculty of Science and Technology Universiti Kebangsaan Malaysia Faculty of Computers and Mathematical Sciences Universiti Teknologi MARA Pahang Faculty of Mathematics University of Cluj

The steady laminar boundary layer flow adjacent to a vertical plate with prescribed surface temperature immersed in an incompressible viscous fluid,where the effect of thermal radiation was taken into consideration,was *** governing partial differential equations were transformed into a system of ordinary differential equations using similarity transformation,before being solved numerically by the shooting *** assisting and opposing buoyant flows were *** is found that dual solutions exist for both cases. Moreover,numerical results show that the heat transfer rate at the surface decreases in the presence of the radiation effect.

关键词： boundary layer heat transfer thermal radiation similarity solution

On the stability of the flow over a shrinking cylinder with prescribed surface heat flux

在线全文

学校读者我要写书评

暂无评论

Propulsion and Power Research 2020年第2期9卷 181-187页

作者： Izyan Syazana Awaludin Rokiah Ahmad anuar Ishak Faculty of Management Multimedia University63100CyberjayaSelangorMalaysia Department of Mathematical Sciences Faculty of Science and TechnologyUniversiti Kebangsaan Malaysia43600UKMBangiSelangorMalaysia

This study investigates the steady stagnation point flow and heat transfer passes a horizontal shrinking permeable *** free stream velocity and the prescribed surface heat flux arc assumed to vary linearly with the distance from a fixed point on the *** partial differential equations governing the flow and heat transfer are transformed into a system of ordinary differential equations via similarity *** equations are solved numerically for several values of the governing parameters,such as suction parameter s,curvature parameter γ,and shrinking parameter λ.The equations arc solved numerically by employing the boundary value problem solver package available in MATLAB software,*** effects of the governing parameters on the skin friction coefficient,surface temperature,velocity,and temperature profiles are *** the existence of dual solutions in the present study for a certain range of the curvature parameter,stability analysis is carried out to determine which one of the solutions is stable as time *** outcome of the stability analysis demonstrates that only the first solution,with lower boundary layer thickness,appeared to be stable and thus physically reliable,while the other is *** is also discovered that the boundary layer separation is delayed by reducing the curvature parameter.

关键词： Stagnation point flow Heat transfer Shrinking cylinder Prescribed surface heat Stability analysis

Magnetohydrodynamic (MHD) Jeffrey fluid over a stretching vertical surface in a porous medium

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Propulsion and Power Research 2017年第4期6卷 269-276页

作者： Kartini Ahmad anuar Ishak Department of Science in Engineering Kulliyah of EngineeringIIUMGombakKuala Lumpur 50728Malaysia School of Mathematical Sciences Faculty of Science and TechnologyUKMUKM BangiSelangor 43600Malaysia

This paper presents the study of steady two-dimensional mixed convection boundary layer flow and heat transfer of a Jeffrey fluid over a stretched sheet immersed in a porous medium in the presence of a transverse magnetic field. The governing partial differential equations are reduced to nonlinear ordinary differential equations with the aid of similarity transformation, which are then solved numerically using an implicit finite difference scheme. The effects of some of the embedded parameters, such as Deborah number β, magnetic parameter M, mixed convection parameter λ, porosity parameter γ and Prandtl number Pr, on the flow and heat transfer characteristics, are given in forms of tables and graphs.

关键词： Magnetohydrodynamic(MHD) Jeffrey fluid Mixed convection Porous media Boundary layer

Impacts of forest management on liana diversity and community structure in a tropical forest in Ghana:implications for conservation

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Forestry Research 2016年第1期27卷 147-153页

作者： P.Addo-Fordjour Z.B.Rahmad A.M.S shahrul M.Ashyraf School of Biological Sciences Universiti Sains Malaysia Department of Theoretical and Applied Biology College of Science Kwame Nkrumah University of Science and Technology (KNUST) The Centre for Marine and Coastal Studies (CEMACS) Universiti Sains Malaysia

We studied the impacts of liana cutting as a forest management tool on liana diversity （species richness, Shannon diversity index） and community structure （diam- eter distribution, basal area, species dominance） in the Asenanyo Forest Reserve, Ghana. Two types of silvicul- turally treated forests were studied： Logging treated （LT） and Tropical Shelterwood System （TSS） treated forests. An untreated primary forest was included as a control, result- ing in three forest management systems. Lianas with diameter 〉2 cm were identified in ten 40 × 40 m2 plots within each management system. Liana cutting signifi- cantly reduced liana species richness, Shannon diversity index, and basal area in the LT forest after two decades. However, liana species richness and basal area werecomparable in the TSS treated and untreated forests, indi- cating significant recovery in the former after over six decades. Sφrensen similarity index of liana species com- position between the untreated forest and each of the treated forests was moderate. Our findings suggest that liana cutting most likely influenced the dominance of some liana species. In view of the adverse impact of blanket liana cutting on liana diversity, selective liana cutting is rec- ommended as a means of controlling liana numbers while maintaining liana diversity.

关键词： Forest management system Liana diversity Liana basal area Silviculture Tropical forest biodiversity

Effects of human disturbance on liana community diversity and structure in a tropical rainforest, Malaysia: implication for conservation

在线全文

学校读者我要写书评

暂无评论

Journal of Plant Ecology 2012年第4期5卷 391-399页

作者： Patrick Addo-Fordjour Zakaria B.Rahmad A.M.S.shahrul School of Biological Sciences Universiti Sains MalaysiaPenangMalaysia

Aim Due to the important role of lianas in the functioning of forest ecosystem,knowledge of the factors that affect them are important in the management of ***,there are conflicting reports on the response of liana communities to disturbance,calling for more research in the *** present study was carried out to investigate the response of liana diversity and structure to human disturbance within two major forests in the Penang National Park,*** study also looked at the implication of the findings for *** A total of 15 40×40-m^(2)(or 40-m×40-m)plots each were randomly located across a range of habitats in a primary forest and disturbed secondary *** with diameter at breast height≥10 cm were examined for lianas with diameter≥2 *** lianas and trees were enumerated and compared between the two *** and structural variables of lianas were compared between the two forests using the t-test *** abundance was also compared between the two forests with t-test,while linear regression analysis was run to determine the effects of tree abundance on liana *** Findings A total of 46 liana species belonging to 27 genera and 15 families were identified in the *** disturbance significantly reduced liana species richness and species diversity in the secondary *** abundance remained the same in both forests whereas liana basal area was;7 times higher in the primary *** and hook climbers were significantly more abundant in the primary and secondary forest,*** diameter lianas were more abundant in the primary forest compared with the secondary *** diameter distribution of most families in the primary forest followed the inverted J-shaped curve whereas only a few of the families in the secondary forest did *** abundance was significantly higher in the primary *** abundance of lianas significantly depended on tree abundance in all the f

关键词： climbing mechanism conservation liana diversity and structure human disturbance