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Performance-driven design methodology for habitation shell design in extreme conditions on Mars

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Frontiers of Architectural Research 2022年第2期11卷 224-238页

作者： gokhan Dede Department of Architecture Built Environment and Construction EngineeringPolitecnico di MilanoVia Giuseppe Ponzio3120133 MilanoItaly

The research project illustrates how performance-driven design tools can be conducted as an architectural design methodology that suggests an innovative approach to design a habitation shell in extreme environmental conditions without human *** research study attempts to use environmental data revealed by NASA and its habitat design requirements to develop a conceptual design for an innovative habitation form and then simulate it with Mars conditions to analyze the habitation shell’s structural behavior according to finite element *** this regard,research phases,including layout configuration,form-finding,and structural analysis,have been conducted to explore a habitation concept implemented with generative design tools as a decision-maker in extreme *** conclusion,two generated typologies of proposed habitation forms will be compared in terms of their structural performance under extreme loads of the martian *** this research project,due to the numerous extreme challenges of design and construction of habitation in extreme conditions using conventional approaches,a performance-driven design methodology will provide a rational and sustainable design methodology to tackle extreme barriers to Mars’s environment.

关键词： Performance-driven shell design Finite element model In-situ material Extreme conditions Mars habitation

Cyber Secure Framework for Smart Containers Based on Novel Hybrid DTLS Protocol

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Computer Systems Science & Engineering 2022年第12期43卷 1297-1313页

作者： Waseem Ullah khan Safdar Nawaz khan Marwat Salman Ahmed Department of Computer Systems Engineering University of Engineering and Technology PeshawarPeshawar25120Pakistan

The Internet of Things (IoTs) is apace growing, billions of IoT devicesare connected to the Internet which communicate and exchange data among eachother. Applications of IoT can be found in many fields of engineering and sciencessuch as healthcare, traffic, agriculture, oil and gas industries, and logistics. Inlogistics, the products which are to be transported may be sensitive and perishable, and require controlled environment. Most of the commercially availablelogistic containers are not integrated with IoT devices to provide controlled environment parameters inside the container and to transmit data to a remote *** necessitates the need for designing and fabricating IoT based smart containers. Due to constrained nature of IoT devices, these are prone to different cybersecurity attacks such as Denial of Service (DoS), Man in Middle (MITM) andReplay. Therefore, designing efficient cyber security framework are required forsmart container. The Datagram Transport Layer Security (DTLS) Protocol hasemerged as the de facto standard for securing communication in IoT ***, it is unable to minimize cyber security attacks such as Denial of Serviceand Distributed Denial of Service (DDoS) during the handshake process. Themain contribution of this paper is to design a cyber secure framework by implementing novel hybrid DTLS protocol in smart container which can efficientlyminimize the effects of cyber attacks during handshake process. The performanceof our proposed framework is evaluated in terms of energy efficiency, handshaketime, throughput and packet delivery ratio. Moreover, the proposed framework istested in IoT based smart containers. The proposed framework decreases handshake time more than 9% and saves 11% of energy efficiency for transmissionin compare of the standard DTLS, while increases packet delivery ratio andthroughput by 83% and 87% respectively.

关键词： Logistic container logistics security cyber security perishable products monitoring

Technical efficiency of hybrid maize growers: A stochastic frontier model approach

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Journal of Integrative Agriculture 2019年第10期18卷 2408-2421页

作者： Imad Ali HUO Xue-xi Imran khan Hashmat Ali khan Baz Sufyan Ullah khan College of Economics and Management Northwest A&F UniversityYangling 712100P.R.China School of Economics Dongbei University of Finance and EconomicsDalian 116025P.R.China School of Economics and Management China University of GeosciencesWuhan 430074P.R. China

This study investigated the effect of credit constraints and credit unconstraints on the technical efficiency of hybrid maize growers in the Khyber Pakhtunkhwa Province(KPK) of Pakistan. The primary data were collected by a direct elicitation method from 510 maize growers of KPK Province. Stochastic frontier model techniques were used for technical efficiency analyses. The results revealed that the mean technical efficiency difference between the two groups was 10.2%. The results of technical inefficiency effect modeling demonstrated that education of the household head, family size, number of married family members, off-farm income, farming experience, tractor drill, water irrigation through a lined course, certified seed, extension services, household saving variables, and a credit size variable had positive effects on technical efficiency for both credit constrained farmers(CCFs) and credit unconstrained farmers(UCCFs). In addition, age of household head and fragmented land values had negative effects on technical efficiency for both groups. However, the interest rate had positive and negative impacts on the technical efficiency of CCFs and UCCFs, respectively. Our results have significant implications for policies related to land use, interest rate, and banking sector expansion in the rural areas of Pakistan.

关键词： stochastic frontier analysis maize growers technical efficiency credit rationing and credit markets in Pakistan

Effectiveness of radiative heat flux in MHD flow of Jeffrey-nanofluid subject to Brownian and thermophoresis diffusions

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Journal of Hydrodynamics 2019年第2期31卷 421-427页

作者： Muhammad Ijaz khan Tasawar Hayat Muhammad Waqas Ahmed Alsaedi Muhammad Imran khan Department of Mathematics Quaid-I-Azam UniversityIslamabadPakistan Nonlinear Analysis and Applied Mathematics(NAAM)Research group Department of MathematicsFaculty of ScienceKing Abdulaziz UniversityJeddahSaudi Arabia Heriot Watt University Edinburgh CampusEdinburghUK

Our interest here in this investigation is to explore the thermophoresis and Brownian motion characteristics in flow induced by stretched *** conducted Jeffrey material formulates the flow *** forms of stretching and free stream velocities are *** radiation and convective heating processes describe the phenomenon of heat *** controls of nanoparticles are considered on the *** compatible transformations produce the strong nonlinear differential *** problems are computed analytically utilizing *** nee domain is detennined and major results are concluded for different parameters *** transfer rate and drag force are also explained for various physical *** analysis reveals that heat transfer rate augments via larger radiation parameter and Biot *** larger Brownian motion and thermophoresis parameters have opposite characteristics on concentration field.

关键词： Jeffrey nanomaterial non-linear radiative heat flux convective boundary conditions.Brownian and thermophoresis diffusions

Electron acoustic solitary waves in unmagnetized nonthermal plasmas

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Communications in Theoretical Physics 2021年第5期73卷 80-84页

作者： Muhammad Khalid Aqil khan Mohsin khan Daud khan Sheraz Ahmad Ata-ur-Rahman Department of Physics Government Post Graduate College MardanMardan 23200Pakistan Theoretical Plasma Physics group Department of PhysicsIslamia College Peshawar(Public Sector University)Peshawar 25120Pakistan Department of Physics Government Post Graduate College NowsheraNowshera 24100Pakistan

Electron acoustic(EA)solitary waves(SWs)are studied in an unmagnetized plasma consisting of hot electrons(following Cairns-Tsalli distribution),inertial cold electrons,and stationary *** employing a reductive perturbation technique(RPT),the nonlinear Korteweg–de Vries(KdV)equation is derived and its SW solution is ***,the effects of plasma parameters such as the nonextensivity parameter(q),the nonthermality of electrons(α),and the cold-to-hot electron density ratio(β)are investigated.

关键词： Electron acoustic solitons KdV equation Cairns-Tsalli distribution

Quantum Monty Hall Problem under Decoherence

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Communications in Theoretical Physics 2010年第7期54卷 47-54页

作者： Salman khan M.Ramzan M.K.khan Department of Physics Quaid-i-Azam University

We study the effect of decoherence on quantum Monty Hall problem under the influence of amplitude damping, depolarizing, and dephasing channels. It is shown that under the effect of decoherence, there is a Nash equilibrium of the game in case of depolarizing channel for Alice＇s quantum strategy. Whereas in case of dephasing noise, the game is not influenced by the quantum channel. For amplitude damping channel, Bob＇s payoffs are found symmetrical about a decoherence of 50% and the maximum occurs at this value of decoherence for his classical strategy. However, it is worth-mentioning that in case of depolarizing channel, Bob＇s classical strategy remains always dominant against any choice of Alice＇s strategy.

关键词： quantum Monty Hall problem decoherence entanglement payoffs

Dynamic trip point categorisation using manufacturing process for polycrystalline diamond compact bits as case study

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Journal of Control and Decision 2022年第3期9卷 311-321页

作者： Zubair Ahmad khan Khalid khan Shuja Ahmad khan Shahbaz khan Muhammad Tufail Abdel Nasser Mechatronics Department University of Engineering and Technology PeshawarPeshawarPakistan Materials for Energy Storage and Conversion US Pakistan Centre for Advanced Studies in Energy University of Engineering and Technology PeshawarPeshawarPakistan Bakar Hughes HoustonGermany Jacobs DallasTXUSA

Disruptions in the manufacturing process cast substantial impacts on the consumer’s centric values,cost,and overall *** ripple effect of these disruptions is observed in the whole assembly *** proper analysis and mitigation of disruptions is the key to the proficiency of the plant and resource *** research focuses on the quantitative analysis of the impact of disruptions of the manufacturing process,which is performed by analysing the disruptive workstation *** disruptive workstations have a significant impact on succeeding and preceding workstations,which have been analysed dynamically,and accordingly,the preset alarm trip points are *** results show that lowering the number of starts and stops decreases the number of rejections of valuable process batches that finally improve ***,the developed model is implemented on a polycrystalline diamond compact drill bit manufacturing *** results are compared with the research work of other researchers,showing a 60%reduction in the number of start/stop events,60%reduction in downtime,while a 75%reduction in the number of rejections is noted.

关键词： Disruptions dynamic assessment downtime alarm tripoints

Design and Energy Estimation of QCA Based Simple Data Path Selector Cum Router Unit for Nano Communication

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China Communications 2022年第11期19卷 231-240页

作者： Angshuman khan Rajeev Arya Department of Electronics and Communication Engineering National Institute of Technology PatnaBihar 800005India Department of Electronics and Communication Engineering University of Engineering and ManagementJaipurRajasthan 303807India

Quantum dot cellular automata(QCA)is promising nanotechnology due to the three main advantages:faster speed,nanoscale size,and ultrasmall power *** paper proposed a simple data path selector cum router as the‘multiplexerchannel-demultiplexer’unit using QCA,an unavoidable building block of nano communication.A Simple 2×2 block and the extended 4×4 block of data path selectors have been proposed in this *** layouts of the proposed designs have been verified in QCADesigner,and the energy dissipation has been evaluated using two tools,QCAPro and QCQDesigner-E(QDE).The suggested designs reached a significant improvement in cell complexity(cell count)and covered area over the existing *** precise,the proposed 2×2(4×4)block shows 86%(63%)lower cell complexity and 87%(37%)smaller area than the prior reported similar *** addition,the currently reported 2×2(4×4)unit has 86%(60%)lower QDE based energy dissipation compared with prior reported designs.

关键词： nanocommunication quantum dot cellular automata router switch

Natural Propulsion with Lorentz Force and Nanoparticles in a Bioinspired Lopsided Ciliated Channel

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Journal of Bionic Engineering 2017年第1期14卷 172-181页

作者： Noreen Sher Akbar Liaqat Ali khan Zafar Hayat khan Nazir Ahmed Mir DBS&H CEME National University of Sciences and Technology Islamabad Pakistan Basic Science Department Ripha International University Islamabad Pakistan Department of Mathematics University of Malakand Chakdara Dir (Lower) Khyber Pakhtunkhwa Pakistan

The transportation of biological and industrial nanofluids by natural propulsion like cilia movement and self-generated contraction-relaxation of flexible walls has tremendous applications in various fields. Inspired by multidisciplinary invention in this direction, a fuid mechanical model is proposed to study the Magneto-hydrodynamics （MHD） and heat transfer for nanofluids fabricated by the dispersion of nanoparticles in water as base fluid. The steady flow is induced by metachronal wave propulsion due to beating cilia. The flow regime is asymmetric channel. The flow is restricted under the low Reynolds number and long wavelength approximations. Cilia boundary conditions for velocity components are employed to find the exact solutions. The impacts of pertinent physical parameters on temperature profile, velocity profile, pressure, and stream lines are computed numerically. It is observed that velocity is inversely proportional to magnetic Reynolds number, Reynolds number, Strommer＇s number and velocity is directly proportional to flow rate. It is analyzed that temperature is inversely proportional to Strommer＇s number and magnetic Reynolds number and directly proportional to Brinkmann number and flow rate. The temperature is maximum at the center of the channel and it starts decreasing towards the boundary walls.

关键词： copper water nanoparticles induced magnetic field asymmetric ciliated channel