检索结果-南通市图书馆

Propulsion and Power Research 2019年第3期8卷 234-242页

作者： m.I.Afridi m.qasim Department of mathematics COMSATS Institute of Information TechnologyIslamabad45550Pakistan

In the present article,we perform the second law analysis of classical Blasius flow accounting the effects of nonlinear radiation and frictional *** two-dimensional boundary layer momentum and energy equations are converted to self-similar equations using similarity *** set of resultant ordinary differential equations are solved *** numerical results obtained from solutions of dimensionless momentum and energy equations are used to calculate the entropy generation number and Bejan *** velocity profile f'(ξ),temperature distributionθ(ξ),entropy production number Ns and Bejan number Be are plotted against the physical flow parameters and are discussed in ***,for the sake of validation of our numerical code,the obtained results are reproduced using matlab built-in boundary value solver bvp4c resulting in an excellent *** is observed that entropy generation is increasing function of heating parameter,Prandtl number,Eckert number and radiation ***,it is observed that entropy generation can be minimized by reducing the operating temperatureΔT=T_(w)−T_(∞).

关键词： Second law analysis Boundary layer Nonlinear Rosseland thermal radiation Energy dissipation bvp4c

Dual Solutions of mHD Boundary Layer Flow of a micropolar Fluid with Weak Concentration over a Stretching/Shrinking Sheet

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

Communications in Theoretical Physics 2017年第4期67卷 449-457页

作者： Z.H.Khan m.qasim Naeema Ishfaq W.A.Khan Department of mathematics University of MalakandChakdaraDir(Lower)Khyber PakhtunkhwaPakistan Department of mathematics COMSATS Institute of Information TechnologyPark RoadChak ShahzadIslamabadPakistan School of mathematical Sciences Peking UniversityBeijing 100871China Department of mechanical and Industrial Engineering College of Engineering Majmaah UniversityMajmaah 11952Kingdom of Saudi Arabia

We investigate the dual solutions for the mHD flow of micropolar fluid over a stretching/shrinking sheet with heat transfer. Suitable relations transform the partial differential equations into the ordinary differential *** forms solutions are also obtained in terms of confluent hypergeometric function. This is the first attempt to determine the exact solutions for the non-linear equations of mHD micropolar fluid model. It is demonstrated that the microrotation parameter helps in increasing Nusselt number and the dual solutions exist for all fluid flow parameters under consideration. The dual behavior of dimensionless velocity, temperature, microrotation, skin-friction coefficient,local Nusselt number is displayed on graphs and examined.

关键词： mHD micropolar fluid stretching/shrinking sheet exact and dual solutions

Particle breakage of sand subjected to friction and collision in drum tests

在线全文

学校读者我要写书评

暂无评论

Journal of Rock mechanics and Geotechnical Engineering 2021年第2期13卷 390-400页

作者： Fangwei Yu Chonglei Zhang Qijun Xie Lijun Su Tao Zhao m.qasim Jan Key Laboratory of mountain Hazards and Earth Surface Process of CAS Institute of Mountain Hazards and EnvironmentChinese Academy of SciencesChengdu610041China Center for Excellence in Tibetan Plateau Earth Sciences Chinese Academy of SciencesBeijing100101China China-Pakistan Joint Research Center on Earth Sciences CAS-HECIslamabad45320Pakistan Department of Civil Engineering The University of TokyoTokyo113-8656Japan University of Chinese Academy of Sciences Beijing100049China Department of Civil and Environmental Engineering Brunel University LondonLondonUB83PHUK National Centre of Excellence in Geology University of PeshawarPeshawar25130Pakistan

This paper presents a laboratory experimental study on particle breakage of sand subjected to friction and collision,by a number of drum tests on granular materials(silica sand No.3 and ceramic balls)to investigate the characteristics of particle breakage and its effect on the characteristics of grain size distribution of *** breakage increased in up convexity with increasing duration of drum tests,but increased linearly with increasing number of *** breakage showed an increase,followed by a decrease while increasing the amount of *** may be existence of a characteristic amount of sand causing a maximum particle *** tests caused much less particle breakage than collision tests *** and collision resulted in different mechanisms of particle breakage,mainly by abrasion for friction and by splitting for *** fines content increased with increasing relative *** breakage in the friction tests(abrasion)resulted in a sharper increase but with a smaller total amount of fines content in comparison with that in the collision tests(splitting).For the collision tests,the fines content showed a decrease followed by an increase as the amount of sand increased,whereas it increased in up convexity with increasing number of *** characteristic grain sizes D_(10) and D_(30) decreased in down convexity with increasing relative breakage,which could be described by a natural exponential ***,the characteristic grain sizes D50 and D60 decreased linearly while increasing the relative *** addition,the coefficients of uniformity and curvature of sand showed an increase followed by a decrease while increasing the relative breakage.

关键词： Grain size distribution Drum tests Granular flow Particle breakage

Petrogenesis of middle Triassic Volcaniclastic Rocks from Balochistan,Pakistan:Implications for the Break-Up of Gondwanaland

在线全文

学校读者我要写书评

暂无评论

Journal of Earth Science 2017年第2期28卷 218-228页

作者： Rehanul Haq Siddiqui m.qasim Jan m.Ishaq Kakar Andrew C.Kerr Abdul Salam Khan Ehsanullah Kakar Balochistan University of Information Technology Engineering and Management Seiences Quetta 87300 Pakistan National Centre of Excellence in Geology University of Peshawar Pakistan & COMSTECH Islamabad 44000 Pakistan Centre of Excellence in mineralogy University of Balochistan Quetta 87300 Pakistan School of Earth and Ocean Sciences Cardiff University Main Building Park Place Cardiff Wales CF 10 3AT UK

Basaltic volcanic conglomerates near the Wulgai village in Balochistan occur in the undivided sedimentary rock unit of the Bagh complex which is the mélange zone beneath the muslim Bagh ophiolite. The presence of middle Triassic grey radiolarian chert within the upper and lower horizon of the conglomerates suggests that the lavas, from which these conglomerates were principally derived, were eroded and re-deposited in the middle Triassic. The Wulgai conglomerate contains several textural and mineralogical varieties of volcanic rocks, such as porphyritic, glomerophyric, intersertal and vitrophyric basalts. The main minerals identified in these samples are augite, olivine, plagioclase（An35–78） leucite and nosean, with apatite ilmenite, magnetite and hematite occurring as accessory minerals. These rocks are mildly to strongly-alkaline with low mg~# and low Cr, Ni and Co contents suggesting that their parent magma had undergone considerable fractionation prior to eruption. Trace element-enriched mantle-normalized patterns with marked positive Nb anomalies are consistent with 10%–15% melting of an enriched mantle source in a within-plate tectonic setting. It is proposed that this middle Triassic intra-plate volcanism may represent mantle plume-derived melts related to the Late Triassic rifting of micro-continental blocks（including Afghan, Iran, Karakorum and Lhasa） from the northern margin of Gondwana.

关键词： middle Triassic Wulgai volcaniclastics juvenile Ceno-Tethys

Geochemistry and Tectonic Settings of Felsic Dykes in the Neoproterozoic Nagar Parkar Igneous Complex, SE Sindh, Pakistan

在线全文

学校读者我要写书评

暂无评论

Acta Geologica Sinica(English Edition) 2016年第S1期90卷 124-页

作者： Tahseenullah Khan mamoru murata m.qasim Jan Hafiz Ur Rehman muhammad Zafar Hiroaki Ozawa Anwar Qadir Saqib mehmood Department of Earth and Environmental Sciences Bahria University Department of Geosciences Faculty of Science Naruto University of Education National University Corporation National Centre of Excellence in Geology University of Peshawar and COMSTECH Islamabad Department of Earth and Environmental Science Faculty of Science Kagoshima University International Cooperation Center for the Teacher Education and Training Naruto University of Education Department of Geology Haripur University

The Nagar Parkar complex consists of Neoproterozoic igneous and metamorphic rocks dissected by episodic mafic and felsic *** latter can be classified broadly into porphyritic felsic dykes and aplitic felsic dykes(minor)

关键词： SE Sindh Pakistan Geochemistry and Tectonic Settings of Felsic Dykes in the Neoproterozoic Nagar Parkar Igneous Complex

VARIATIONS IN KAmILA AmPHIBOLITES FROm SOUTHEASTERN PART OF THE KOHISTAN ISLAND-ARC TERRANE,PAKISTAN

在线全文

学校读者我要写书评

暂无评论

地学前缘 2000年第S1期7卷 200-200页

作者： m.Ahmed Khan\+1,m.Asif Khan\+2,m.qasim Jan\+2[WT5,5”BX](1 Government College,Sargodha,Pakistan 2.National Centre of Excellence in Geology, University of Peshawar,Pakistan)

The Kohistan terrane in *** is sandwiched between the Shyok Suture in the north and Indus Suture in the *** SE base of the terrane is occupied by the stratiform Sapat mafic\|ultramafic complex,which overrides the crust of the Indian plate along the Indus *** complex was intruded into the base of a thick pile of metavolcanics (now amphibolites) of different environments (the Kamila belt).The Kamila amphibolite belt has a vast distribution in southern part of ***,it was considered that the belt occupies the entire southern part of the Kohistan terrane between the main mantle Thrust (mmT) or Indus Suture (IS) in the south and the Chilas Complex in the *** the Indus Valley,the unit was considered to overlie the Jijal Complex which occupies the hanging wall of the *** mapping during this study has revealed that the Kamila amphibolite belt is in direct contact with the mmT only in the extreme eastern (i.e..,Bunar valley) and western parts of the Kohistan *** the area between t he Babusar Pass in the east and the Indus Valley in the west,the belt is separated from the mmT by a basal ultramafic\|mafic layered complex in the hanging wall of the mmT,termed the Sapat *** the north,the belt is bounded by the Chilas Complex which occupies an axial position in the Kohistan *** Kamila amphibolites do not occur as a single,extensive body in the studied area but they occur in three main linear belts (from south to north as Bausar,Jal\|Niat,and Sumal)with small patches and screens within or between plutons of different compositions from diorites to granodiorites,trondhjemites and *** is a thin slice within the Jal\|Niat *** and Jal\|Niat are tholeiitic while Sumal is calc\|alkaline in *** tholeiitic amphibolites are further divided into two:Babusar amphibolites contain low TiO\-2 and very low Zr as compared to the Jal\|*** Jal\|Niat amphibolites show flat patterns with slight increas

关键词： amphibolite Kohistan terrane Pakistan

Three-dimensional mixed convection flow with variable thermal conductivity and frictional heating

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2020年第3期72卷 14-20页

作者： m.qasim N Riaz Dianchen Lu S Shafie Department of mathematics Faculty of ScienceJiangsu UniversityZhenjiang 212013China Department of mathematics COMSATS University Islamabad(CUI)455000Park RoadTarlai KalanIslamabad.Pakistan Department of mathematical Sciences Faculty of ScienceUniversiti Teknologi Malaysia81310 UTM Johor BahruJohor 81310Malaysia

In this article,three-dimensional mixed convection flow over an exponentially stretching sheet is *** equation is modelled in the presence of viscous dissipation and variable thermal *** of the sheet is varying exponentially and is chosen in a form that facilitates the similarity transformations to obtain self-similar *** nonlinear ordinary differential equations are solved numerically employing the Runge-Kutta shooting *** order to check the accuracy of the method,these equations are also solved using bvp4c built-in routine in *** solutions are in excellent *** effects of physical parameters on the dimensionless velocity field and temperature are demonstrated through various *** novelty of this analysis is the self-similar solution of the threedimensional boundary layer flow in the presence of mixed convection,viscous dissipation and variable thermal conductivity.

关键词： self-similar equations viscous dissipation mixed convection variable thermal conductivity shooting technique bvp4c matlab

Quantitative analysis of saindha salt using laser induced breakdown spectroscopy and cross-validation with ICP-mS

在线全文

学校读者我要写书评

暂无评论

Plasma Science and Technology 2020年第7期22卷 51-58页

作者： m.qasim m ANWAR-UL-HAQ m SHER AFGAN S U HAQ m A BAIG Department of Physics University of SargodhaSargodha 40100Pakistan Department of Energy&Power Engineering Tsinghua-BP Clean Energy CenterTsinghua UniversityBeijing 100084People’s Republic of China National Institute of Lasers and Optronics(NILOP) NiloreIslamabad 45650Pakistan National Center for Physics Quaid-i-Azam University CampusIslamabad 45320Pakistan

Saindha salt is considered to be more advantageous than the other edible salts for the patients suffering from diabetes,blood pressure and kidney *** explore the constituent elements of this salt,laser induced breakdown spectroscopy(LIBS) has been exploited for its qualitative and quantitative *** third harmonic(355 nm) of a Q-switched Nd:YAG laser has been used to produce the saindha salt plasma and the time integrated optical emission spectra were registered using a set of six miniature spectrometers covering the spectral range of 230-805 *** spectroscopic analysis of the emission spectra predominately revealed numerous neutral or singly ionized emission lines of Ca,mg,Na,K,Fe,Sr,Si,Li and *** laser produced plasma was characterized by calculating the electron temperature from the Boltzmann plots and the electron number density from the Stark broadened line profile as a function of laser irradiance and distance from the target *** relative concentration of the constituent elements was extracted by the integrated line intensities of the strongest spectral line of each element using the self-calibration-LIBS(SC-LIBS) and one-line calibration free-LIBS(OLCF-LIBS) *** cross-validation,the LIBS results have been compared with that obtained from the inductively coupled plasma-mass spectroscopy(ICP-mS) showing good agreement.

关键词： elemental analysis CF-LIBS plasma parameters

Synthesis and superconductivity of（Ag）x/CuTl-1223 composites

在线全文

学校读者我要写书评

暂无评论

Progress in Natural Science:materials International 2015年第3期25卷 204-208页

作者： Abdul Jabbar Irfan qasim m.mumtaz K.Nadeem materials Research Laboratory Department of PhysicsFaculty of Basic and Applied Sciences(FBAS)International Islamic University(IIU)

Series of(Ag)x/(Cu0.5Tl0.5Ba2Ca2Cu3O10-δ) {(Ag)x/Cu Tl-1223} nano-superconductor composites were synthesized with different concentrations(i.e. x ? 0 4.0 wt%) of silver(Ag) nanoparticles. Low anisotropic Cu Tl-1223 superconducting matrix was prepared by solid-state reaction and Ag nanoparticles were prepared by a sol–gel method separately. The required(Ag)x/Cu Tl-1223 composition was obtained by the inclusion of Ag nanoparticles in Cu Tl-1223 superconducting matrix. Structural, morphological, compositional and superconducting transport properties of these composites were investigated in detail by x-ray diffraction(XRD), scanning electron microscopy(SEm), energy dispersive x-rays(EDX)spectroscopy and four-point probe electrical resistivity(ρ) measurements. The inclusion of Ag nanoparticles enhanced the superconducting properties without affecting the tetragonal structure of the host Cu Tl-1223 matrix. The improvement in superconducting properties of(Ag)x/Cu Tl-1223 composites is most likely due to enhanced inter-grains coupling and increased superconducting volume fraction after the addition of metallic Ag nanoparticles at the inter-crystallite sites in the samples. The presence of Ag nanoparticles at the grain-boundaries may increase the number of flux pinning centers, which were present in the form of weak-links in the pure Cu Tl-1223 superconducting matrix.

关键词： (Ag)x/CuTl-1223 composites Ag nanoparticles weak-links superconducting properties

An Optimized Convolutional Neural Network Architecture Based on Evolutionary Ensemble Learning

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Computers, materials & Continua 2021年第12期69卷 3813-3828页

作者： qasim m.Zainel murad B.K.horsheed Saad Darwish Amr A.Ahmed College of Physical Education and Sports Sciences University of KirkukKirkuk36001Iraq College of Administration&Economics University of KirkukKirkuk36001Iraq Department of Information Technology Institute of Graduate Studies and ResearchAlexandria UniversityAlexandriaEgypt Department of Computer Engineering Alexandria Higher Institute of Engineering&Technology(AIET)AlexandriaEgypt

Convolutional Neural Networks(CNNs)models succeed in vast *** are available in a variety of topologies and *** challenge in this area is to develop the optimal CNN architecture for a particular issue in order to achieve high results by using minimal computational resources to train the *** proposed framework to automated design is aimed at resolving this *** proposed framework is focused on a genetic algorithm that develops a population of CNN models in order to find the architecture that is the best *** comparison to the co-authored work,our proposed framework is concerned with creating lightweight architectures with a limited number of parameters while retaining a high degree of validity accuracy utilizing an ensemble learning *** architecture is intended to operate on low-resource machines,rendering it ideal for implementation in a number of *** common benchmark image datasets are used to test the proposed framework,and it is compared to peer competitors’work utilizing a range of parameters,including accuracy,the number of model parameters used,the number of GPUs used,and the number of GPU days needed to complete the *** experimental findings demonstrated a significant advantage in terms of GPU days,accuracy,and the number of parameters in the discovered model.

关键词： Convolutional neural networks genetic algorithm automatic model design ensemble learning