检索结果-南通市图书馆

Energy and Life Cycle Assessment of Zinc/Water Nanofluid Based Photovoltaic Thermal System

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Energy Engineering 2022年第2期119卷 827-846页

作者： Junaid Khan Rashid Ali muzammil Zubair syed Mohd Yahya SEARL Laboratory Department of Mechancial EngineeringAligarh Muslim UniversityAligarh202002India

Cooling the PV surface in a Photovoltaic Thermal system is a pivotal operational aspect to be taken into account to achieve optimized values of performance parameters in a Photovoltaic Thermal *** experimental design used in this study facilitates the flow of varying concentrations of Zn-water nanofluid in serpentine copper tubing installed at the rear of the PV panel thereby preventing the PV surface temperature from increasing beyond the threshold value at which a decrease in electrical efficiency starts to *** fusion of solar thermal with PV devices leads to better electrical and thermal efficiency values resulting in decreased cell degradation over time and maximization of the lifespan of the PV module and the energy output from the PV *** to the superior thermal heat properties of nanofluids,their usage in such systems has become increasingly *** cycle metrics which include Energy Payback period,Energy Production Factor and life cycle conversion efficiency were evaluated for the PVT system by exhaustively chalking fundamental parameters such as embodied energy of the PVT setup and the total energy output from the PVT *** research aims to be a major milestone in the evolutionary journey of Photovoltaic Thermal modules by guiding the engineers working on the theory,design and implementation of PVT systems towards its economic feasibility,environmental impact and energy sustainability.

关键词： Photovoltaic thermal system nanofluids performance parameters life cycle assessment

Effective link quality estimation as a means to improved end-to-end packet delivery in high traffic mobile ad hoc networks

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Digital Communications and Networks 2017年第3期3卷 150-163页

作者： syed Rehan afzal Sander Stuijk Majid Nabi Twan Basten Eindhoven University of Technology Den Dolech 2 5612AZ Eindhoven The Netherlands TNO-ESI Embedded Systems Innovation De Rondom 1 5612AP Eindhoven The Netherlands

Accurate link quality estimation is a fundamental building block in quality aware multi hop routing. In an inherently lossy, unreliable and dynamic medium such as wireless, the task of accurate estimation becomes very challenging. Over the years ETX has been widely used as a reliable link quality estimation metric. However, more recently it has been established that under heavy traffic loads ETX performance gets significantly worse. We examine the ETX metric＇s behavior in detail with respect to the MAC layer and UDP data; and identify the causes of its unreliability. Motivated by the observations made in our analysis, we present the design and implementation of our link quality measurement metric xDDR - a variation of ETX. This article extends xDDR to support network mobility. Our experiments show that xDDR substantially outperforms minimum hop count, ETX and HETX in terms of end-to-end packet delivery ratio in static as well as mobile scenarios.

关键词： Asymmetric link quality Link-quality measurement Wireless ad hoe networks

Human Behavior Classification Using Geometrical Features of Skeleton and Support Vector Machines

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 2019年第8期61卷 535-553页

作者： syed Muhammad Saqlain Shah Tahir afzal Malik Robina khatoon syedSaqlain Hassan Faiz Ali Shah Department of CS&SE International Islamic UniversityH-10 SectorIslamabad44000Pakistan Department of Management Information Systems Ibn Rushd College of Management SciencesAbhaSaudi Arabia Department of Computer Science Bahria UniversityIslamabad44000Pakistan Institute of Computer Science University of TartuTartuEstonia

Classification of human actions under video surveillance is gaining a lot of attention from computer vision *** this paper,we have presented methodology to recognize human behavior in thin crowd which may be very helpful in *** have mostly focused the problem of human detection in thin crowd,overall behavior of the crowd and actions of individuals in video *** based Human behavior modeling is a complex task as it involves human detection,tracking,classifying normal and abnormal *** proposed methodology takes input video and applies Gaussian based segmentation technique followed by post processing through presenting hole filling algorithm i.e.,fill hole inside objects *** detection is performed by presenting human detection algorithm and then geometrical features from human skeleton are extracted using feature extraction *** classification task is achieved using binary and multi class support vector *** proposed technique is validated through accuracy,precision,recall and F-measure metrics.

关键词： Human behavior classification segmentation human detection support vector machine

Mechanisms and molecular approaches for heat tolerance in rice (Oryza sativa L.) under climate change scenario

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 Integrative Agriculture 2018年第4期17卷 726-738页

作者： syed Adeel Zafar Amjad Hameed Muhammad Amjad Nawaz MA Wei Mehmood All Noor muzammil Hussain Mehboob-ur-Rahman National Key Facility for Crop Gene Resources and Genetic Improvement/Institute of Crop Sciences Chinese Academy of Agricultural Sciences Beijing 100081 P.R.China Nuclear Institute for Agriculture and Biology (NIAB) Faisalabad 38000 Pakistan Department of Biotechnology College of Engineering Science Chonnam National University Chonnam 59626 Republic of Korea Institute of Crop Sciences Chinese Academy of Agricultural Sciences~Key Laboratory of Crop Physiology and Ecology Ministryof Agriculture Beijing 100081 P.R.China State Key Laboratory of Mycology/Institute of Microbiology Chinese Academy of Sciences Beijing 100101 P.R. China Plant Genomics & Molecular Breeding Laboratories National Institute for Biotechnology and Genetic Engineering (NIBGE)Faisalabad 38000 Pakistan

Rice, a staple cereal crop in many parts of the world, has been confronted with multiple environmental stresses including high temperature, negatively impacts the booting as well as anthesis growth stages. The situation is further complicated by the changing climatic conditions, resulting in gradual escalation of temperature as well as changing the rainfall pattern and frequency, thus raising a concern of food security worldwide. The situation can be combat by developing rice varieties with excellent genetics with improved morpho-physiological, biochemical, and molecular mechanisms, together can minimize the adverse effects of heat stress. Here, several strategies(encompassing genetic and genomic, and mechanisms involved) for mitigating the impact of high temperature on rice have been discussed. Finally, the utilization of genomic knowledge in augmenting the conventional breeding approaches have been comprehensively elaborated to develop heat tolerant germplasm.

关键词： heat stress rice climate change molecular markers heat stress responses

A Weighted Spatially Constrained Finite Mixture Model for Image Segmentation

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Computers, Materials & Continua 2021年第4期67卷 171-185页

作者： Mohammad Masroor Ahmed Saleh Al Shehri Jawad Usman Arshed Mahmood Ul Hassan muzammil Hussain Mehtab afzal Department of Computer Science Capital University of Science&TechnologyIslamabad45730Pakistan Department of Computer Science Jubail University CollegeJubail31961Saudi Arabia Department of Computer Science University of BaltistanSkardu16100Pakistan Department of Computer Skills Preparatory Year Najran University1988Saudi Arabia Department of Computer Science University of Management&TechnologyLahore54782Pakistan Department of Computer Science University of LahoreLahore54500Pakistan

Spatially Constrained Mixture Model(SCMM)is an image segmentation model that works over the framework of maximum a-posteriori and Markov Random Field(MAP-MRF).It developed its own maximization step to be used within this *** research has proposed an improvement in the SCMM’s maximization step for segmenting simulated brain Magnetic Resonance Images(MRIs).The improved model is named as the Weighted Spatially Constrained Finite Mixture Model(WSCFMM).To compare the performance of SCMM and WSCFMM,simulated T1-Weighted normal MRIs were segmented.A region of interest(ROI)was extracted from segmented *** similarity level between the extracted ROI and the ground truth(GT)was found by using the Jaccard and Dice similarity measuring *** to the Jaccard similarity measuring method,WSCFMM showed an overall improvement of 4.72%,whereas the Dice similarity measuring method provided an overall improvement of 2.65%against the ***,WSCFMM signicantly stabilized and reduced the execution time by showing an improvement of 83.71%.The study concludes that WSCFMM is a stable model and performs better as compared to the SCMM in noisy and noise-free environments.

关键词： Finite mixture model maximum aposteriori Markov random eld image segmentation

A Scalable Key Management Scheme for Secure Multicasting over Bluetooth Scatternets

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

China Communications 2008年第2期5卷 25-33页

作者： Subir Biswas syed Rehan afzal Jong-bin Koh Mustafa Hasan Gunhee Lee Dong-kyoo Kim Graduate School of Information and Communication Ajou University

Secure multicasting is one of the major requirementsfor today’s communication *** for any kindof secure communication,a key-distribution schemeis the most sensible *** a highly promising,low-cost,and emerging wireless technology,Bluetooth has key distribution supports for securemulticasting over its unit one-hop network,*** core specification[1]defines basic securityprotocols for key generation,encryption,andauthentication for intra-piconet ***,not much attention has been paid so far on securingmulticasting over the Bluetooth Scatternet;nevertheless,multicasting is quite a sensible aspectof modern communication *** in this paper,we extend the piconets key distribution scheme topresent a new key management scheme for securemulticasting over Bluetooth *** keymanagement scheme is compatible to the currentBluetooth architecture design as we rely onBluetooth’s existing security algorithms to proposeour resolution.

关键词： Bluetooth Piconet Scattemet Master node Master key

巴基斯坦传统银行与穆斯林银行的绩效比较研究

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

巴基斯坦传统银行与穆斯林银行的绩效比较研究

作者： syed MUHAMMAD muzammil 渤海大学

学位级别：硕士

The study evaluates and measures the performance of two types of banks that is Conventional Banks and Islamic bank during the period from 2006 to 2010. Financial statements of both types of banks have been used to analyze their performance. The first chapter is the introduction to the study, what is the purpose of study, its limitations and the research *** second chapter is about the history of banking sector and banking in Pakistan. This chapter first describes historical perspective of banking and how and where it was started and then introduction of banking in Pakistan, what are its functions and banking *** third chapter is about the introduction to Islamic Banking and what are the different products and terminologies use in Islamic banking. The fourth chapter is the Literature Review which contains an *** the Fifth chapter I have discussed the research methodologies and explain different ratios that are useful in evaluating performance of both the banks. I have briefly defined each ratio in this chapter. Secondly, after that I have shown the results which I have calculated after analyzing and studying the financial statements which is also shown in graphical representation using line chart and then finally in the seventh chapter I have concluded all my research and findings.

关键词： Conventional banking Islamic banking Interest free banking History of banking Performance evaluation of both banking Pakistan

Suitability of marble powders in production of high strength concrete

同方学位论文库评论

在线全文

同方学位论文库

学校读者我要写书评

暂无评论

Low-carbon Materials and Green Construction 2023年第1期1卷 365-380页

作者： syed afzal Basha Faiz Uddin Ahmed Shaikh G Pullaiah College of Engineering and Technology KurnoolAndhra PradeshIndia School of Civil and Mechanical Engineering Curtin UniversityPerthAustralia

A tremendous amount of non-biodegradable waste is created during mining and processing tasks of layered stones like *** time,this has become a global problem because it harms the environment in multiple ***,it is necessary to find an alternate way to securely dispose and reuse marble *** construction sector is one of the significant consumers of natural resources for the production of material binders and *** a result,in recent years,number of researchers have carried out studies in which various kinds of marble waste have been incorporated into concrete with the intention of substituting either cement or aggregates or *** paper presents the effect of two locally sourced waste marble powders Kadapa marble powder(KMP)and Bethamcherla marble powder(BMP)as partial replacement of cement on mechanical and durability properties of high strength concrete(HSC).Their effect at different replacement levels in HSC is evaluated in compressive,indirect tensile and flexural strengths,elastic modulus,chloride penetration resistance and freeze-thaw durability ***-structural investigation is also conducted to evaluate their impact on the matrix of HSC containing waste marble powders as additional cementitious *** show that the HSC consisting of KMP and BMP content of 10%and 15%,respectively exhibited higher mechanical and durability properties than the control ***-structural investigation also supports this *** can be concluded that the use of marble powders as partial replacement of cement does not have any adverse impact on the properties of *** use of KMP and BMP reduces the vast amount of energy required to produce cement,cost and time with reduction in environmental hazards.

关键词： Bethamcherla marble powder High strength concrete Kadapa marble powder Manufactured sand

Application of Electrodynamic Theory on Quantum Hall Effect

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Condensed Matter Physics 2016年第2期6卷 87-94页

作者： Saleem Iqbal Muhammad Zafar Farhana Sarwar syed Mohsin Raza Muhammad afzal Rana Department of Mathematics University of Balochistan Quetta Pakistan Department of Basic Sciences Riphah International University Islamabad Pakistan Department of Mathematics F. G. Girls Degree College Quetta Pakistan Department of Physics University of Balochistan Quetta Pakistan

The quantum electrodynamic (QED) behaviour is studied for quantum Hall effect (QHE). Quantum theory with conjecture of fractional charge quantization (quantum dipole moment), eigenfunctions for fractional charge quantization at the surface of a twisted and twigged electron quanta and above its surface, fractional Fourier transform and Hermite function for fractional charge quantization is developed. With energy eigen value equation for QHE and with energy operator on an eigenfunction of a twisted and twigged electron quanta, the corresponding eigenfunctions are normalized with Schrodinger’s quantum wave mechanical equation for electric scalar and magnetic potentials, respectively (QED behavior). The fractional electric and magnetic fields with their corresponding potentials for the quantized fractional states in semiconducting hereto structures are theoretically calculated. Such mathematical expressions are in good agreement with experimental results of Nobel Prize winning scientists Klitzing, Haroche, Peter and Gruebber. Our results can also explain the hybridized states of orbits with emphasis on sigma and pi bonding and their corresponding antibonding orbitals as a manifestation of electrophilic and nucleophilic chemical reactions.

关键词： Fractional Charge Quantization Fractional Fourier Transform Quantum Hall Effect Quantum Electrodynamics Electron Quanta String Twisted and Twigged Electron Quanta