检索结果-南通市图书馆

Unsteady Squeezing Flow of Jeffery Fluid between Two Parallel Disks

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2012年第3期29卷 135-138页

作者： A.Qayyum m.awais A.Alsaedi T.Hayat Department of mathematics Quaid-I-Azam University 45320Islamabad 44000Pakistan Department of mathematics Faculty of ScienceKing Abdulaziz UniversityP.O.Box 80257Jeddah 21589Saudi Arabia

We investigate an unsteady axisymmetric flow of a Jeffrey fluid between two parallel *** relevant partial differential equations are modeled and simplified by using appropriate *** resulting ordinary differential system is solved and a series solution is *** of various parameters of interest on the flow quantities are *** is found that the velocity profile increases when porosity and squeezing parameters are increased.

关键词： ordinary unsteady flow

Newtonian heating in stagnation point flow of Burgers fluid

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Applied mathematics and mechanics(English Edition) 2015年第1期36卷 61-68页

作者： T.HAYAT S.ALI m.awais m.S.ALHUTHALI Department of mathematics Quaid-i-Azam University Nonlinear Analysis and Applied mathematics (NAAm) Research Group Faculty of Science King Abdulaziz University Faculty of Engineering Sciences Ghulam Ishaq Khan Institute of Engineering Sciences and Technology Department of mathematics COMSATS Institute of Information Technology

The Newtonian heating effects in the stagnation point flow of a Burgers fluid are addressed in this paper. The boundary layer flow problems are stated in the spatial domain from zero to infinity. The solution expressions for the velocity and the temperature are obtained and examined for the influential variables. The tabulated values show comparison with the previous results. It is observed that the obtained results are in good agreement with the existing results in limiting sense.

关键词： Burgers fluid Newtonian heating series solutions

Numerical Analysis of magnetohydrodynamic Navier’s Slip Visco Nanofluid Flow Induced by Rotating Disk with Heat Source/Sink

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2019年第9期71卷 1075-1083页

作者： m.awais S.Bilal m.Y.malik Khalil-ur-Rehman Department of mathematics AIR UniversitySector E-9Air ComplexIslamabad44000Pakistan Department of mathematics College of SciencesKing Khalid UniversityAbha61413Saudi Arabia Department of mathematics Quaid-i-Azam UniversityIslamabad44000Pakistan

Current exertion is made to depict and search out the flow features imparted to viscid fluid flow over a rotational disk. Impression of magnetic field with rotating fluid is generated by interacting it in radial *** structured particles with magnetized fluid are also incorporated in the upshot of chemical reaction and absorptive/generative heat induction. Von Kumaran procedure is executed to obtain flow narrating differential *** pattern regarding thermal, momentum profiles are comprehended with the support of shooting method and RungeKutta methods. Furthermore, to get more realistic view of result description computational algorithm is modified by improving Runge-Kutta coefficients with Cash and Carp method. The aspects of flow controlling parameters like momentum slip parameter, magnetic strength parameter, Brownian motion parameter, thermophoresis parameter are adorned in sketches. Findings of these architects are accumulated in conclusion section.

关键词： heat generation/absorption viscous fluid model nanoparticles rotating disk Navier slip Cash and Carp method

Axisymmetric Powell-Eyring fluid flow with convective boundary condition: optimal analysis

在线全文

学校读者我要写书评

暂无评论

Applied mathematics and mechanics(English Edition) 2016年第7期37卷 919-928页

作者： T.HAYAT S.mAKHDOOm m.awais S.SALEEm m.m.RASHIDI Department of mathematics Quaid-i-Azam University Department of mathematics COMSATS Institute of Information Technology Department of mathematics Statistics and Physics Qatar University Shanghai Key Lab of Vehicle Aerodynamics and Vehicle Thermal management Systems Tongji University

The effects of axisymmetric flow of a Powell-Eyring fluid over an impermeable radially stretching surface are presented. Characteristics of the heat transfer process are analyzed with a more realistic condition named the convective boundary condition. Governing equations for the flow problem are derived by the boundary layer approximations. The modeled highly coupled partial differential system is converted into a system of ordinary differential equations with acceptable similarity transformations. The convergent series solutions for the resulting system are constructed and analyzed. Optimal values are obtained and presented in a numerical form using an optimal homotopy analysis method （OHAm）. The rheological characteristics of different parameters of the velocity and temperature profiles are presented graphically. Tabular variations of the skin friction coefficient and the Nusselt number are also calculated. It is observed that the temperature distribution shows opposite behavior for Prandtl and Biot numbers. Furthermore, the rate of heating/cooling is higher for both the Prandtl and Biot numbers.

关键词： axisymmetric flow optimal homotopy analysis method (OHAm) analysis,convective boundary condition

基于计算智能技术的巴基斯坦北部地区地震活动性预测

在线全文

学校读者我要写书评

暂无评论

世界地震译丛 2020年第2期51卷 117-131页

作者： K.m.Asim m.awais F.martínez-álvarez T.Iqbal 张盛峰宋潇潇中国地震局地震预测研究所/山东省地震预报研究中心湖北省地震局

本文针对巴基斯坦北部地区进行了地震预测研究。研究方法包含了地震学和计算智能技术领域不同学科的交叉融合。针对历史地震活动计算了8种地震学参数。通过计算它们的信息增益来评估这8种参数的预测效能,进而选择了其中6种应用于预测试... 详细信息

本文针对巴基斯坦北部地区进行了地震预测研究。研究方法包含了地震学和计算智能技术领域不同学科的交叉融合。针对历史地震活动计算了8种地震学参数。通过计算它们的信息增益来评估这8种参数的预测效能,进而选择了其中6种应用于预测试验。基于这6种参数发展了多个计算智能模型用于预测试验。这些模型包括前馈神经网络、循环神经网络、随机森林、多层感知、径向基神经网络和支持向量机。本文评估了每一种模型的效能,同时利用mcNemar统计检验方法来研究计算方法的统计显著性。前馈神经网络模型在巴基斯坦北部地区可表现出统计显著性为75%准确率和78%正确预报的预测结果。

关键词：地震预报计算智能地震活动性地震前兆

Thermophoresis and concentration effects in a fourth grade peristaltic flow with convective walls

在线全文

学校读者我要写书评

暂无评论

Journal of Central South University 2017年第7期24卷 1654-1662页

作者： Ali Aamir Asghar S awais m Department of mathematics COMSATS Institute of Information TechnologyAttock 43600Pakistan Department of mathematics COMSATS Institute of Information TechnologyIslamabad 44000Pakistan Department of mathematics King Abdulaziz UniversityJeddah 21432Saudi Arabia

In this investigation,we have studied the peristaltic fluid flow in an asymmetric channel with convective *** grade fluid model has been utilized in view of the fact that the results of all other differential type models can be deduced as the special *** effects of heat and mass transfer are *** thermophoresis effects occur in the energy *** heat and mass boundary conditions have been given special *** wave length and low Reynolds number approximations are utilized for the *** analytic solutions for the velocity,temperature and concentration profiles are calculated using perturbation technique and elaborated in the form of graphical observations for various physical quantities.

关键词： fourth grade fluid convective boundary conditions pumping and trapping peristalsis

Role of Air Staging in a Batch-Type Fixed Bed Biomass Combustor under Constant Primary Air

在线全文

学校读者我要写书评

暂无评论

Journal of Thermal Science 2024年第1期33卷 284-299页

作者： awais JUNEJO Yasir m.AL-ABDELI Jacobo PORTEIRO School of Engineering Edith Cowan UniversityJoondalupWA 6027Australia CINTECX Universidade de Vigo Grupo de Tecnoloxia Enerxetica(GTE)36310 VigoEspana

Staged combustion of biomass is the most suitable thermo-chemical conversion for achieving lower gaseous emissions and higher fuel conversion *** a staged fixed bed combustion of biomass,combustion air is supplied in two *** the first stage,primary air is provided below the fuel,whereas in the later stage,secondary air is supplied in the freeboard *** available literature on the effects of air staging(secondary air location) at a constant primary air flow rate on combustion characteristics in a batch-type fixed bed combustor is limited and hence warrants further *** study resolves the effect of air staging,by varying the location of secondary air in the freeboard at five secondary to total air ratios in a batch-type fixed bed *** are reported for the effects of these controlled parameters on fuel conversion rate,overall gaseous emissions(CO_(2),CO and NO_x) and temperature *** fuel used throughout was densified hardwood *** show that a primary freeboard length(distance between fuel bed top and secondary air injection) of200 mm has higher fuel conversion rates and temperatures as well as lower CO emissions,at a secondary to total air ratio of 0.75 as compared to primary freeboard length of 300 ***,NO_x emissions were found to be lower for a primary freeboard length of 300 mm as compared to 200 *** increase in secondary to total air ratio from 0.33 to 0.75 resulted in higher freeboard temperatures and lower CO as well as NO_x *** outcomes of this study will be helpful in the effective design of commercial scale biomass combustors for more efficient and environmentally friendly combustion.

关键词： fixed bed combustor biomass combustion air staging freeboard temperature burning rate gaseous emissions

A Novel Compact Highly Isolated UWB mImO Antenna with WLAN Notch

在线全文

学校读者我要写书评

暂无评论

Computers, materials & Continua 2023年第4期75卷 669-681页

作者： muhammad awais Shahid Bashir awais Khan muhammad Asif Nasim Ullah Hend I.Alkhammash Department of Electrical Engineering University of Engineering and TechnologyPeshawar25000Pakistan Department of Electrical Engineering University of Science and TechnologyBannu28100Pakistan Department of Electrical Engineering College of Engineering Taif UniversityAl-HawiyahTaifP.O.Box 888Saudi Arabia Department of Electrical Engineering College of EngineeringTaif UniversityP.O.Box 11099Taif21944Saudi Arabia

This paper presents a compact multiple Input multiple Output(mImO)antenna with WLAN band notch for Ultra-Wideband(UWB)*** antenna is designed on 0.8mmthick low-cost FR-4 substrate having a compact size of 22mm×30 *** proposed antenna comprises of two monopole patches on the top layer of substrate while having a shared ground on its bottom *** mutual coupling between adjacent patches has been reduced by using a novel stub with shared ground *** stub consists of complementary rectangular slots that disturb the surface current direction and thus result in reducing mutual coupling between two ports.A slot is etched in the radiating patch for WLAN band *** slot is used to suppress frequencies ranging from 5.1 to 5.9 *** results show that the proposed antenna has a very good impedance bandwidth of|S11|m 3.1–14 GHz.A low mutual coupling of less than−23 dB is achieved within the entire UWB ***,the antenna has a peak gain of 5.8 dB,low ECC9.98).

关键词： multiple input multiple output(mImO) ultra-wide band(UWB) defected ground structure envelope correlation coefficient diversity gain

Crop Breeding Chips and Genotyping Platforms： Progress, Challenges, and Perspectives

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

molecular Plant 2017年第8期10卷 1047-1064页

作者： awais Rasheed Yuanfeng Hao Xianchun Xia awais Khan Yunbi Xu Rajeev K. Varshney Zh-onghu He Institute of Crop Sciences National Wheat Improvement Center Chinese Academy of Agricultural Sciences (CAAS) Beijing 100081 China International maize and Wheat Improvement Center (CImmY-F) c/o CAAS Beijing 100081 China Department of Plant Pathology and Plant-microbe Biology Cornell University Geneva NY USA International Crops Research Institute for the Semi-Arid Tropics (ICRISAT) Patancheru 502324 India

There is a rapidly rising trend in the development and application of molecular marker assays for gene map- ping and discovery in field crops and trees. Thus far, more than 50 SNP arrays and 15 different types of genotyping-by-sequencing （GBS） platforms have been developed in over 25 crop species and perennial trees. However, much less effort has been made on developing ultra-high-throughput and cost-effective genotyping platforms for applied breeding programs. In this review, we discuss the scientific bottlenecks in existing SNP arrays and GBS technologies and the strategies to develop targeted platforms for crop mo- lecular breeding. We propose that future practical breeding platforms should adopt automated genotyping technologies, either array or sequencing based, target functional polymorphisms underpinning economic traits, and provide desirable prediction accuracy for quantitative traits, with universal applications under wide genetic backgrounds in crops. The development of such platforms faces serious challenges at both the technological level due to cost ineffectiveness, and the knowledge level due to large genotype- phenotype gaps in crop plants. It is expected that such genotyping platforms will be achieved in the next ten years in major crops in consideration of （a） rapid development in gene discovery of important traits, （b） deepened understanding of quantitative traits through new analytical models and population designs, （c） integration of multi-layer -omics data leading to identification of genes and pathways responsible for important breeding traits, and （d） improvement in cost effectiveness of large-scale genotyping. Crop breeding chips and genotyping platforms will provide unprecedented opportunities to accelerate the development of cultivars with desired yield potential, quality, and enhanced adaptation to mitigate the effects of climate change.

关键词： Single nucleotide polymorphisms (SNPs) Genotyping-by-sequencing (GBS) SNP arrays Crop breeding Genotyping platforms