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Chinese Physics B 2017年第1期26卷 444-448页

作者： Ishfaq Ahmad Shah najam ul hassan Jun Liu Yuanyuan Gong Guizhou Xu Feng Xu Jiangsu Key Laboratory of Advanced Micro ＆ Nano Materials and Technology School of Materials Science and Engineering Nanjing University of Science and Technology Nanjing 210094 China

We investigate the influence of Sb-doping on the martensitic transformation and magnetocaloric effect in Mn（50）Ni（40）Sn（10-x）Sbx（x = 1, 2, 3, and 4） alloys. All the prepared samples exhibit a B2-type structure with the space group F m3 m at room temperature. The substitution of Sb increases the valence electron concentration and decreases the unit cell volume. As a result, the magnetostructural transformation shifts rapidly towards higher temperatures as x *** changes in magnetic entropy under different magnetic field variations are explored around this transformation. The isothermal magnetization curves exhibit typical metamagnetic behavior, indicating that the magnetostructural transformation can be induced by a magnetic field. The tunable martensitic transformation and magnetic entropy changes suggest that Mn（50）Ni（40）Sn（10-x）Sbx alloys are attractive candidates for applications in solid-state refrigeration.

关键词： Mn-rich Heusler alloys martensitic transformation magnetocaloric effect magnetic entropy change

Magnetostructural transformation and magnetocaloric effect in Mn_(48-x)V_(x)Ni_(42)Sn_(10) ferromagnetic shape memory alloys

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Chinese Physics B 2018年第3期27卷 439-443页

作者： najam ul hassan Ishfaq Ahmad Shan Tahira Khan Jun Liu Yuanyuan Gong Xuefei Miao Feng Xu MIIT Key Laboratory of Advanced Metallic and Intermetallic Materials Technology School of Materials Science and EngineeringNanjing University of Science and TechnologyNanjing 210094China Beijing National Laboratory for Condensed Matter Physics Chinese Academy of SciencesBeijing 100190China

In this work,we tuned the magnetostructural transformation and the coupled magnetocaloric properties of Mn_(48-x)V_(x)Ni_(42)Sn_(10)(x=0,1,2,and 3)ferromagnetic shape memory alloys prepared by means of partial replacement of Mn by *** is observed that the martensitic transformation temperatures decrease with the increase of V *** shift of the transition temperatures to lower temperatures driven by the applied field,the metamagnetic behavior,and the thermal hysteresis indicates the first-order nature for the magnetostructural *** entropy changes with a magnetic field variation of 0-5 T are 15.2,18.8,and 24.3 ***^(-1).K^(-1)for the x=0,1,and 2 samples,*** tunable martensitic transformation temperature,enhanced field driving capacity,and large entropy change suggest that Mn_(48-x)V_(x)Ni_(42)Sn_(10)alloys have a potential for applications in magnetic cooling refrigeration.

关键词： magnetostructural coupling field driving capacity refrigeration capacity magnetocaloric effect

Influence of Ni/Mn ratio on magnetostructural transformation and magnetocaloric effect in Ni48-xCo2Mn38+xSn12(x=0,1.0,1.5,2.0,and 2.5)ferromagnetic shape memory alloys

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Chinese Physics B 2017年第9期26卷 428-432页

作者： Ishfaq Ahmad Shah najam ul hassan Abdur Rauf 刘俊龚元元徐桂舟徐锋 Jiangsu Key Laboratory of Advanced Micro&Nano Materials and Technology School of Materials Science and EngineeringNanjing University of Science and TechnologyNanjing 210094China Herbert Gleiter Institute of Nanoscience Nanjing University of Science and TechnologyNanjing 210094China

An investigation on the magnetostructural transformation and magnetocaloric properties of Ni48-xCo2Mn38＋xSn12（x = 0, 1.0, 1.5, 2.0, and 2.5） ferromagnetic shape memory alloys is carried out. With the partial replacement of Ni by Mn in the Ni_（48）Co2Mn38Sn12 alloy, the electron concentration decreases. As a result, the martensitic transformation temperature is decreased into the temperature window between the Curie-temperatures of austenite and martensite. Thus, the samples with x = 1.5 and 2.0 exhibit the magnetostructural transformation between the weak-magnetization martensite and ferromagnetic austenite at room temperature. The structural transformation can be induced not only by the temperature,but also by the magnetic field. Accompanied by the magnetic-field-induced magnetostructural transformation, a considerable magnetocaloric effect is observed. With the increase of x, the maximum entropy change decreases, but the effective magnetic cooling capacity increases.

关键词： Ni–Co–Mn–Sn alloy magnetostructural transformation magnetocaloric effect magnetic entropy change

A Novel Framework for Multi-Classification of Guava Disease

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Computers, Materials & Continua 2021年第11期69卷 1915-1926页

作者： Omar Almutiry Muhammad Ayaz Tariq Sadad Ikram ullah Lali Awais Mahmood najam ul hassan Habib Dhahri College of Applied Computer Sciences King Saud University(Almuzahmiyah Branch)Riyadh11564KSA Department of Computer Science University of Central PunjabLahore54000Pakistan Department of CS&SE International Islamic UniversityIslamabad44000Pakistan Division of Science and Technology University of EducationLahore54000Pakistan Department of Electrical and Computer Engineering Dhofar UniversitySalalahOman

Guava is one of the most important fruits in Pakistan,and is gradually boosting the economy of *** production can be interrupted due to different diseases,such as anthracnose,algal spot,fruit fly,styler end rot and *** diseases are usually detected and identified by visual observation,thus automatic detection is required to assist *** this research,a new technique was created to detect guava plant diseases using image processing techniques and computer *** automated system is developed to support farmers to identify major diseases in *** collected healthy and unhealthy images of different guava diseases from the *** image labeling was done with the help of an expert to differentiate between healthy and unhealthy *** local binary pattern(LBP)was used for the extraction of features,and principal component analysis(PCA)was used for dimensionality *** classification was carried out using multiple classifiers,including cubic support vector machine,Fine K-nearest neighbor(F-KNN),Bagged Tree and RUSBoosted Tree algorithms and achieved 100%accuracy for the diagnosis of fruit flies disease using Bagged ***,the findings indicated that cubic support vector machines(C-SVM)was the best classifier for all guava disease mentioned in the dataset.

关键词： Classification guava disease image processing machine learning

Surgical Arm Rest Using Novel Smart Material Based Fluid

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Surgical Arm Rest Using Novel Smart Material Based Fluid

Impact of Climate Change on Epidemiology of Various Pests of Wheat Crop in Punjab Pakistan

International Conference on Recent Trends in Computer & Information Engineering(ICRTCIE’2012);International Conference on Mechanical,Materials and Automotive Engineering(ICMMAE’2012);International Conference on Advances in Electrical and Electronics Engineering(ICAEEE’2012);International Conference on Ecological,Environmental and Bio- Sciences(ICEEBS’2012);International Conference on Business,Economics,and Behavioral Sciences (ICBEBS’2012);International Conference on Chemical Engineering and Pharmaceutical Sciences(ICCEPS’2012)

作者： Syed najam ul hassan Syed Fahad Akbar Ali Eraj Humayun Mirza Biomedical Engineering Department Sir Syed University of Engineering and Technology

Designing of surgical arm rest carrying smart materials is based upon a new and innovative idea of using novel smart material i.e. magnetorheological fluid （MR Fluid） in surgical arm rests. MR fluid was previously used in automotive industry for providing smooth movements to cars and is best known for its unique solidifying behavior on application of magnetic field. The fluid is practical, price effective and provides easy to use mechanism when applied to arm rest in the form of small solidifying pockets. The smart material based arm rest will provide great help to surgeons in long operations and surgeries which cause an extra amount of pressure on a surgeon’s ulnar nerve, increases the numbness in arm, loss of sense and feeling in the performer’s arm, reduced steadiness during a surgery, lack of stationary movements and failure of holding capabilities which is a key to any successful surgery. Usage of stainless steel makes the arm rest less corrosive, unsubstantial in weight and reusable. Easy clamping of the arm rest to the railing of operating table makes it portable and unobtrusive in the theatre. Usage of screws, pins and notches are avoided during the designing of arm rest, this is done to reduce the chances of equipment’s failure giving it a long lasting and highly reusable approach. The surgical arm rest carrying magnetorheological fluid provides complete freedom of movements to the surgeon with solidification when required using a single button resulting in a safe, secure, cost effective and a steady hand smooth surgery.

关键词： Component Magnetorheological Fluid Surgical Arm Rest Stainless Steel Smart Material Steady Hand Surgery

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American Journal of Plant Sciences 2019年第1期10卷 236-247页

作者： Israr Arshad Amer Rasul Syed Ismat Hussain Hafiz Muhammad Usman Aslam Khizar Hayat Malik najam ul hassan Sidra Muqeet Amina Yasir Umar Shabab Nasir Anum Tehseen Directorate of Pest Warning & Quality Control of Pesticides Punjab Pakistan Department of Plant Pathology University of Agriculture Faisalabad Pakistan Department of Plant Pathology and Microbiology Iowa State University USA Horticultural Research Institute Ayub Agricultural Research Institute (AARI) Faisalabad Pakistan Department of Zoology Government College University Faisalabad Faisalabad Pakistan Institute of Agriculture & Resource Economics University of Agriculture Faisalabad Pakistan

Wheat [Triticum aestivum L. (Poaceae)] is the staple diet of people in Pakistan. It is attacked by many types of pests. Therefore the purpose of this study was to assess the impact of climate change on the ecology and epidemiology of various wheat pests in Punjab, Pakistan. Results indicate that maximum weeds hot spots 242 (5.98%) Phalaris minor, 45 (1.18%) wild oat and 203 (5.01%) broad leaf weeds were noted in 2015. Aphid 31 (0.86%) hot spots were recorded in 2016 while maximum army worm 13 (0.26%) hot spots were noted in 2017. Maximum 70 (1.73%) spots of yellow rust and 85 (2.10%) hot spots of brown rust were observed during 2015 while 84 (4.16%) spots of loose smut were observed during 2017. ANOVA shows that years have no significant difference (P > 0.05) but weeks have significant effect on occurrence of these pest incidences except brown rust. But regression ANOVA was significant (P ≤ 0.05) and regression models equations have been developed on the bases of recorded data. Pest incidence was taken as dependent variable Y and weather factors i.e. minimum temperature as X1, maximum temperature as X2, relative humidity as X3 and rain fall as X4 were taken as independent variables. This study will help in recommendations for moving forward aiming at integration of biology of rust and smut diseases of wheat with changing climate for development of resistant varieties for resilient and durable management of these pathogens.

关键词： Climate Change Wheat Weeds Insect Pest Disease Ecology

Average Convergence for Directed&Undirected Graphs in Distributed Systems

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Computer Systems Science & Engineering 2021年第6期37卷 399-413页

作者： Ali Mustafa M najam ul Islam Salman Ahmed Bahria University Islamabad44000Pakistan Comsats University Islamabad Attock campus43600Pakistan University of Engineering&Technology Peshawar25000Pakistan

Consensus control of multi-agent systems is an innovative paradigm for the development of intelligent distributed *** has fascinated numerous scientific groups for their promising applications as they have the freedom to achieve their local and global goals and make their own *** communication topologies based on graph and matrix theory are widely used in a various real-time applications ranging from software agents to ***,while sustaining the significance of both directed and undirected graphs,this research emphases on the demonstration of a distributed average consensus *** uses the harmonic mean in the domain of multi-agent systems with directed and undirected graphs under static topologies based on a control input *** proposed agreement protocol focuses on achieving a constant consensus on directional and undirected graphs using the exchange of information between neighbors to update their status values and to be able to calculate the total number of agents that contribute to the communication network at the same *** proposed method is implemented for the identical networks that are considered under the directional and non-directional communication *** different scenarios are simulated and it is concluded that the undirected approach has an advantage over directed graph communication in terms of processing time and the total number of iterations required to achieve *** same network parameters are introduced for both orientations of the communication *** addition,the results of the simulation and the calculation of various matrices are provided at the end to validate the effectiveness of the proposed algorithm to achieve consensus.

关键词： Multi-agent systems average consensus distributed estimation directed graphs undirected graphs agent counting

Remote Health Monitoring Using IoT-Based Smart Wireless Body Area Network

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Computers, Materials & Continua 2021年第8期68卷 2499-2513页

作者： Farhan Aadil Bilal Mehmood najam ul Hasan Sangsoon Lim Sadia Ejaz Noor Zaman Computer Science Department COMSATS University IslamabadAttock Campus43600Pakistan Department of Electrical and Computer Engineering Dhofar UniversitySalalahOman Department of Computer Engineering Sungkyul UniversityAnyang430010Korea School of Computer Science and Engineering(SCE) Taylor’s UniversityMalaysia

A wireless body area network(WBAN)consists of tiny healthmonitoring sensors implanted in or placed on the human *** sensors are used to collect and communicate human medical and physiological data and represent a subset of the Internet of Things(IoT)*** are connected to medical servers that monitor patients’*** type of network can protect critical patients’lives due to the ability to monitor patients’health continuously and *** inter-WBAN communication provides a dynamic environment for patients allowing them to move ***,during patient movement,the WBAN patient nodes may become out of range of a remote base ***,to handle this problem,an efficient method for inter-WBAN communication is *** this study,a method using a cluster-based routing technique is *** the proposed method,a cluster head(CH)acts as a gateway between the cluster members and the external network,which helps to reduce the network’s *** clustering,the cluster’s lifetime is a vital parameter for network ***,to optimize the CH’s selection process,three evolutionary algorithms are employed,namely,the ant colony optimization(ACO),multi-objective particle swarm optimization(MOPSO),and the comprehensive learning particle swarm optimization(CLPSO).The performance of the proposed method is verified by extensive experiments by varying values of different parameters,including the transmission range,node number,node mobility,and grid size.A comprehensive comparative analysis of the three algorithms is conducted by extensive *** results show that,compared with the other methods,the proposed ACO-based method can form clusters more efficiently and increase network lifetime,thus achieving remarkable network and energy *** proposed ACO-based technique can also be used in other types of ad-hoc networks as well.

关键词： Wireless body area network clustering internet of things evolutionary algorithm ant colony optimization

Application and comparison of kernel functions for linear parameter varying model approximation of nonlinear systems

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Applied Mathematics(A Journal of Chinese Universities) 2023年第1期38卷 58-77页

作者： Faisal Saleem Ahsan Ali Inam-ul-hassan Shaikh Muhammad Wasim Department of Measurements and Control Systems Silesian University of TechnologyGliwicePoland Department of Electrical Engineering University of Engineering and TechnologyTaxilaPakistan Department of Aeronautics and Astronautics Engineering Institute of Space TechnologyIslamabadPakistan

In this paper,a comparative study for kernel-PCA based linear parameter varying(LPV)model approximation of sufficiently nonlinear and reasonably practical systems is carried *** matrix inequalities(LMIs)to be solved in LPV controller design process increase exponentially with the increase in a number of scheduling *** kernel functions are used to obtain the approximate LPV model of highly coupled nonlinear *** error to norm ratio of original and approximate LPV models is introduced as a measure of accuracy of the approximate LPV *** examples conclude the effectiveness of kernel-PCA for LPV model approximation as with the identification of accurate approximate LPV model,computation complexity involved in LPV controller design is decreased exponentially.

关键词： kernel-PCA LMIs LPV error to norm ratio computational complexity and control design

Investigating biological population model using exp-function method

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International Journal of Biomathematics 2016年第2期9卷 159-173页

作者： Qazi Mahmood ul hassan Syed Tauseef Mohyud-Din Department of Mathematics Faculty of Sciences HITEC University Taxila 47080 Pakistan

This paper is the spectator of the arrangement of an efficient transformation and exfunction technique to build up generalized exact solutions of the biological population model equation. Computational work and subsequent numerical results re-identify the effectiveness of proposed algorithm. It is pragmatic that recommended plan is greatly consistent and may be comprehensive to other nonlinear differential equations of fractional order.

关键词： Biological population model fractional calculus exp-function method.