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Fluid Dynamics & Materials Processing 2024年第3期20卷 525-536页

作者： Aaqib Majeed ahmad zeeshan Department of Mathematics The University of FaisalabadFaisalabad38000Pakistan Department of Mathematics and Statistics FBASInternational Islamic University IslamabadIslamabad44000Pakistan

The influence of Brownian motion and thermophoresis on a fluid containing nanoparticles flowing over a stretchable cylinder is *** classical Navier-Stokes equations are considered in a porous *** addition,the Lorentz force is taken into *** controlling coupled nonlinear partial differential equations are transformed into a system of first order ordinary differential equations by means of a similarity *** resulting system of equations is solved by employing a shooting approach properly implemented in *** evolution of the boundary layer and the growing velocity is shown graphically together with the related profiles of concentration and *** magnetic field has a different influence(in terms of trends)on velocity and concentration.

关键词： Mixed convection Brownian motion heat transfer porous surface velocity slip

Source parameters and aftershock pattern of the October 7,2021,M5.9 Harnai earthquake,Pakistan

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Earthquake Science 2024年第4期37卷 304-323页

作者： Mohammad Tahir zeeshan ahmad Sadia Sabahat Muhammad Naveed Mushtaq Talat Iqbal Muhammad Ali Shah Alam Aftab Centre for Earthquake Studies National Centre for PhysicsIslamabad 44000Pakistan

On October 7,2021,a magnitude 5.9 earthquake struck the Harnai(Baluchistan)region of Pakistan,causing several fatalities and injuries within the epicentral ***-order tectonic deformation in this region is caused by the convergence of the Indian Plate with respect to the Eurasian *** Katwaz Block hinders the motion of the Indian Plate,resulting in the formation of strike-slip *** this study,the P-wave first-motion polarity technique was used to determine the mainshock faulting *** scanning of the polarity solutions was applied to determine the most suitable focal mechanism solution among the available solutions generated by the FOCMEC(focal mechanism)*** nodal planes correspond to different faulting styles(i.e.,thrust and strike-slip faulting).A nodal plane oriented in the NW-SE direction corresponded to a strike-slip mechanism,which was considered to be the fault ***,this earthquake was associated with the Harnai-Karahi strike-slip fault zone owing to the fault strike and direction of *** apparent stress drop,fault length,and moment magnitude of the Harnai earthquake were 35.4 bar,6.1 km,and 5.9,respectively.A lower b-value for the Gutenberg-Richter law was observed prior to the ***α-than b-values(α>b)indicate that this earthquake was governed by large events as opposed to small-magnitude *** Harnai sequence had a decay exponent close to unity,lasted for 145 days,and produced few *** study will help the future hazard mitigation in the region.

关键词： focal mechanism solution selection of fault plane FPFIT stress inversion oblique slip mechanism

Synthesis and Charcterization of Silane Crosslinked Hydrogel to pH Sensitive Study

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American Journal of Analytical Chemistry 2024年第5期15卷 165-176页

作者： Muhammad Awais Shahid Abdul Haseeb Tahir zeeshan ahmad Muhammad Arslan Department of Physics The University of Lahore Lahore Punjab Pakistan Department of Chemistry Minhaj University Lahore Lahore Pakistan Department of Physics University of Punjab Lahore Pakistan

Eco-friendly and biodegradable novel hydrogel were prepared by blending and solution casting method. The designed hydrogel is based on chitosan/ PEG600/Gurgam with carbon nanofiller along silane crosslinked (TEOS) with pH sensitive response to controlled release of drug in biomedical materials and agriculture industry. The various concentration of carbon nanofiller is used to analyze its effect on the fabricated hydrogel characteristics by using FTIR, SEM, TGA, swelling studies (water, buffer and ionic solution). Spectra of FTIR reflected both established and newly developed groups (like hydrogel). COOH group presence is clearly observed in this range in the carbon filler reinforced hydrogel. The SEM micrographs show that CPG0.003 had a collection of polysaccharide chains as thin helices, which is attributed to the increase in the size of porosity. TGA shows to increase concentration of nanofiller enhanced the thermal stability of the designed hydrogels at temperature 25˚C to 550˚C mass loss percentage decrease upto 20% and increase thermal stability. This pH response made these resultant hydrogels as fruitful competitor against the many reported controlled release application.

关键词： Chitosan Guargum Hydrogel Carbon Nano Filler Silane Cross Linker pH Sensitive

Determination of the best materials for development and designing product using a multi-criteria decision-making

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Railway Sciences 2024年第5期3卷 541-557页

作者： Rabia Hassan zeeshan ahmad Arfeen Mehreen Kausar Azam Zain ul Abiden Akhtar Abubakar Siddique Department of Management Economicsand Industrial Engineering DIGPolitecnico di MilanoMilanItaly Department of Electrical Engineering College of Engineering and SciencesInstitute of Business Management SindhKarachiPakistan Department of Electrical Engineering The Islamia University of Bahawalpur PakistanBahawalpurPakistan Department of Industrial Manufacturing NED University of Engineering and TechnologyKarachiPakistan Department of Information and Communication Engineering The Islamia University of Bahawalpur PakistanBahawalpurPakistan Department of Electrical Engineering Khwaja Fareed University of Engineering and Information TechnologyRahim Yar KhanPakistan Muhammad Rashid Department of Electrical Engineering Faculty of ScienceThe Islamia University of Bahawalpur PakistanBahawalpurPakistan

Purpose–Material selection,driven by wide and often conflicting objectives,is an important,sometimes difficult problem in material *** this context,multi-criteria decision-making(MCDM)methodologies are *** approach of MCDM is needed to cater to criteria of material assortment *** firms are now concerned about increasing their productivity using mathematical *** occupy a gap in the previous literature this research recommends an integrated MCDM and mathematical Bi-objective model for the selection of *** addition,by using the Technique for Order Preference by Similarity to Ideal Solution(TOPSIS),the inherent ambiguities of decision-makers in paired evaluations are considered in this *** goes on to construct a mathematical bi-objective model for determining the best item to ***/methodology/approach–The entropy perspective is implemented in this paper to evaluate the weight parameters,while the TOPSIS technique is used to determine the best and worst intermediate pipe materials for automotive exhaust *** intermediate pipes are used to join the components of the exhaust *** materials usually used to manufacture intermediate pipe are SUS 436LM,SUS 430,SUS 304,SUS 436L,SUH 409 L,SUS 441 L and SUS *** seven materials are evaluated based on tensile strength(TS),hardness(H),elongation(E),yield strength(YS)and cost(C).A hybrid methodology combining entropy-based criteria weighting,with the TOPSIS for alternative ranking,is pursued to identify the optimal design material for an engineered application in this *** study aims to help while filling the information gap in selecting the most suitable material for use in the exhaust intermediate *** that,the authors searched for and considered eight materials and evaluated them on the following five criteria:(1)TS,(2)YS,(3)H,(4)E and(5)*** first two criteria have been chosen because they can have a lot of influence on the behav

关键词： TOPSIS Multi-criteria decision-making Entropy method Material selection

Viral-host molecular interactions and metabolic modulation:Strategies to inhibit flaviviruses pathogenesis

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World Journal of Virology 2024年第4期13卷 41-50页

作者： zeeshan ahmad Khan Mukesh Kumar Yadav Dong-Woo Lim Hojun Kim Jing-Hua Wang AbuZar Ansari Biohealth Products Research Center(BPRC) Research Center for Agedlife Redesign(RCAR)Department of Physical TherapyINJE UniversityGimhae 5084South Korea Department of Microbiology Central University of PunjabBathinda 151401India Department of Diagnostics College of Korean MedicineDongguk UniversityGoyang 10326South Korea Division of Rehabilitation Medicine of Korean Medicine Department of Oriental Rehabilitation MedicineDongguk UniversityIlsan HospitalGoyang 10326South Korea Institute of Oriental Medicine Dongguk UniversityGoyang 10326South Korea Department of Obstetrics and Gynecology Ewha Womans UniversitySeoul 07985South Korea

Flaviviruses,which include globally impactful pathogens,such as West Nile virus,yellow fever virus,Zika virus,Japanese encephalitis virus,and dengue virus,contribute significantly to human *** the ongoing emergence and resurgence of flavivirus-mediated pathogenesis,the absence of specific therapeutic options remains a challenge in the prevention and treatment of flaviviral *** the intricate processes of fusion,transcription,replication,and maturation,the complex interplay of viral and host metabolic interactions affects *** interactions involve metabolic molecules,such as amino acids,glucose,fatty acids,and nucleotides,each playing a pivotal role in the replication and maturation of *** viral-host metabolic molecular interactions hijack and modulate the molecular mechanisms of host metabolism.A comprehensive understanding of these intricate metabolic pathways offers valuable insights,potentially unveiling novel targets for therapeutic interventions against flaviviral *** review emphasizes promising avenues for the development of therapeutic agents that target specific metabolic molecules,such as amino acids,glucose,fatty acids,and nucleotides,which interact with flavivirus replication and are closely linked to the modulation of host *** clinical limitations of current drugs have prompted the development of new inhibitory strategies for flaviviruses based on an understanding of the molecular interactions between the virus and the host.

关键词： Flavivirus Nonstructural proteins Virus-host interaction Metabolism Inhibitors Vaccines

High-resolution digital beamforming of UWB signals based on Carathéodory representation for delay compensation and array extrapolation

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Journal of Systems Engineering and Electronics 2018年第5期29卷 918-926页

作者： DU Qiang SONG Yaoliang JI Chenhe ahmad zeeshan School of Electronic and Optical Engineering Nanjing University of Science and TechnologyNanjing 210094China

To realize high-resolution digital beamforming(DBF)of ultra-wideband(UWB) signals, we propose a DBF method based on Carath ′eodory representation for delay compensation and array extrapolation. Delay compensation by Carath ′eodory representation could achieve high interpolation accuracy while using the single channel sampling technique. Array extrapolation by Carath ′eodory representation reformulates and extends each snapshot, consequently extends the aperture of the original uniform linear array(ULA) by several times and provides a better realtime performance than the existing aperture extrapolation utilizing vector extrapolation based on the two dimensional autoregressive(2-D AR) model. The UWB linear frequency modulated(LFM) signal is used for simulation analysis. Simulation results demonstrate that the proposed method is featured by a much higher spatial resolution than traditional DBF methods and lower sidelobes than using Lagrange fractional filters.

关键词： beamforming ultra-wideband(UWB) array extrapolation Carathéodory representation fractional delay

Null steering antenna beamforming utilizing space-time adaptive processing

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The Journal of China Universities of Posts and Telecommunications 2015年第4期22卷 51-55页

作者： Zeng Hao ahmad zeeshan Dong Tao Liu Ling School of Communications Engineering Chongqing University Space Star Technology Co. Ltd

A new architecture of null steering antenna based upon the technology of space-time adaptive processing（STAP） with optimized parameters is proposed. The new STAP antenna is comprised of multiple channels and each channel is a transversal filter. So separate sensor element for the reference signal is not required because the antenna gets the reference signal from the first sensor of the auxiliary array. Furthermore, the least mean square（LMS） algorithm is employed to calculate the weight vector. Detailed analysis about the relationship between noise power and output error is investigated. Compared with the traditional null steering antenna in space or space-time domain, the new approach obtains more freedom degrees and can suppress both the wideband and narrowband interferences more efficiently with deeper nulls. Simulation results shows that the proposed architecture outperforms the conventional STAP techniques for interference suppression.

关键词： null steering antenna STAP beamforming interference mitigation

DOA Estimation Algorithm Based on Adaptive Filtering in Spatial Domain

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China Communications 2016年第12期13卷 49-58页

作者： Hao Zeng zeeshan ahmad Jianwen Zhou Qiushi Wang Ya Wang School of Communication Engineering Chongqing University

In this paper, a novel DOA estimation methodology based upon the technology of adaptive nulling antenna is proposed. Initially, the nulling antenna obtains the weight vector by LMS algorithm and power inversion ***, reciprocal of the antenna pattern is defined as the spatial spectrum and the extracted peak values are corresponded to the estimated DOA. Through observation of the spectrum and data analysis of variable steps and SNRs, the simulation results demonstrate that the proposed method can estimate DOA above board. Furthermore, the estimation error of the proposed technique is directly proportional to step size and is inversely proportional to SNR. Unlike the existing MUSIC algorithm, the proposed algorithm has less computational complexity as it eliminates the need of estimating the number of signals and the eigenvalue decomposition of covariance matrix. Also it outperforms MUSIC algorithm, the recently proposed MUSIC-Like algorithm and classical methods by achieving better resolution with narrow width of peaks.

关键词： DOA estimation adaptive filtering power inversion array signal processing

Current Cloud Computing Security Concerns from Consumer Perspective

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机床与液压 2013年第24期41卷 1-5页

作者： Hafiz Gulfam ahmad zeeshan ahmad Department of Computer Science Agriculture University Faisalabad Pakistan Bahria University Islamabad Pakistan

In recent years cloud computing is the subject of extensive research in the emerging field of information technology and has become a promising *** reason behind this widespread interest is its abilityto increase the capacity and capability of enterprises,having no investment for new infrastructure,no software license requirement and no need of any *** concern is the main limitation factor in the growth of this new born *** security responsibilities of both,the provider and the consumer greatly differ between cloud service *** this paper we discuss a variety of security risks,authentication issues,trust,and legal regularity in cloud environment with consumer *** research focused only on technical and business consequences of cloud computing and ignored consumer ***,this paper discusses the consumer security and privacy preferences.

关键词：云计算电子商务信息化建设供应商

Floristic composition and ecological gradient analyses of the Liakot Forests in the Kalam region of District Swat,Pakistan

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Journal of Forestry Research 2019年第4期30卷 1407-1416页

作者： Sohail Anwar Shujaul Mulk Khan zeeshan ahmad Zahid Ullah Majid Iqbal Department of Plant Sciences Quaid-i-Azam UniversityIslamabad 45320Pakistan Centre for Plant Science and Biodiversity University of SwatSwat 19130Pakistan

Kalam Kohistan is a dry,temperate hilly region in the Hindu Raj Series of the Greater Hindu Kush Mountains with diverse *** plant distribution and composition is expression of a range of various environmental variables,ecological and floristic attributes of vegetation in the Laikot Forests were therefore evaluated via consecutive explorative *** forests have not been evaluated ecologically before due to harsh climatic conditions and issues of accessibility and the study in hand is one of the first in its *** ecological techniques were used to sample forest vegetation and identify species in quadrats of 2 m×2 m for herbs,5 m×5 m for shrubs and 10 m×10 m for *** the data of 195 plant species and environmental factors were analyzed via Two-way Cluster Analysis and Canonical Correspondence Analysis using PCORD and CANOCO *** 195 plant species from 63 families were 27 species of Asteraceae,the most-speciose family,followed by Poaceae(20 spp.).The dominant life form was therophyte(86 spp.;44%share),followed by phanerophyte(41 spp.;21%share).For the leaf size spectrum,most prevalent was nanophyll(73 spp.;44%)followed by microphyll(66 spp.,34%)and mesophyll(44 spp.;23%).Calcium carbonate,pH,potassium,sand,silt,organic matter,slope aspect and grazing significantly influenced species composition,distribution and *** floristic variation in the region was diverse due to elevational and aspect gradients and thus devided into three *** vegetation zonation can be utilized for forest management,species and habitat *** in situ and ex situ conservation of threatened plant species may improve their conservation status in future if address properly.

关键词： Floristic composition Ecological factors Life form spectra Leaf form classes Elevation zones Canonical correspondence analysis(CCA)