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The effect of altering crosslinker chemistry during interfacial polymerization on the performance of nanofiltration membranes for desalination, organic, and micropollutants removal

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Frontiers of Chemical Science and Engineering 2023年第12期17卷 2025-2036页

作者： Jamilu Usman abdul waheed Umair Baig Isam HAljundi Interdisciplinary Research Centre for Membranes and Water Security King Fahd University of Petroleum and MineralsDhahran 31261Saudi Arabia Chemical Engineering Department King Fahd University of Petroleum and MineralsDhahran 31261Saudi Arabia

Chemistry of the polyamide active layer of a desalination membrane is critical in determining both its physical and chemical *** this study,we designed and fabricated three novel membranes with different active layers using the crosslinkers:terephthaloyl chloride,isophthaloyl chloride,and trimesoyl *** crosslinkers were reacted with an aqueous solution of an aliphatic *** these crosslinkers differ in their structures and crosslinking mechanisms during interfacial polymerization,the resultant membranes also possess different structural *** water contact angle of the fabricated membranes also varies;the water contact angles of 4A-3P-TPC@PSF/PET,4A-3P-TMC@PSF/PET,and 4A-3P-IPC@PSF/PET,are 68.9°,65.6°,and 53.9°,***,the desalination performance of resultant membranes also showed variations,with 4A-3P-TPC@PSF/PET,4A-3P-IPC@PSF/PET,and 4A-3P-TMC@PSF/PET having a permeate flux of 17.14,25.70,and 30.90 L·m^(−2)·h^(−1),respectively,at 2.5 *** 4A-3P-TPC@PSF/PET membrane exhibited extensive crosslinking with aliphatic linear amine,and cationic dye rhodamine B,MgCl_(2),and amitriptyline rejection rates of 98.6%,92.7%and 80.9%,*** 4A-3P-TMC@PSF/PET membrane showed mediocre performance,while 4A-3P-IPC@PSF/PET membrane showed even lower performance,with a 35%rejection of methyl orange dye.

关键词： acid chlorides covalent crosslinking desalination linear aliphatic amine micropollutant removal thin film composite membranes

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Investigation of E-H mode transition in magnetic-pole-enhanced inductively coupled neon-argon mixture plasma

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Plasma Science and Technology 2020年第6期22卷 110-119页

作者： Zahid Iqbal KHATTAK abdul waheed KHAN Faiq JAN Muhammad SHAFIQ Department of Physics Quaid-i-Azam University45320 IslamabadPakistan Department of Physics Gomal University29050 D.I.KhanPakistan Department of Physics Govt.Post Graduate College Nowshera24100 NowsheraPakistan 不详

In this paper,E-H mode transition in magnetic-pole-enhanced inductively coupled neon-argon mixture plasma is investigated in terms of fundamental plasma parameters as a function of argon fraction(0%-100%),operating pressure(1 Pa,5 Pa,10 Pa and 50 Pa),and radio frequency(RF)power(5-100 W).An RF compensated Langmuir probe and optical emission spectroscopy are used for the diagnostics of the plasma under *** to the lower ionization potential and higher collision cross-section of argon,when its fraction in the discharge is increased,the mode transition occurs at lower RF power;*** 0%argon and1 Pa pressure,the threshold power of the E-H mode transition is 65 W,which reduces to 20 W when the argon fraction is *** electron density increases with the argon fraction at afixed pressure,whereas the temperature decreases with the argon *** relaxation length of the low-energy electrons increases,and decreases for high-energy electrons with argon fraction,due to the Ramseur ***,the relaxation length of both groups of electrons decreases with pressure due to reduction in the mean free *** electron energy probability function(EEPF)profiles are non-Maxwellian in E-mode,attributable to the nonlocal electron kinetics in this mode;however,they evolve to Maxwellian distribution when the discharge transforms to H-mode due to lower electron temperature and higher electron density in *** tail of the measured EEPFs is found to deplete in both E-and H-modes when the argon fraction in the discharge is increased,because argon has a much lower excitation potential(11.5 eV)than neon(16.6 eV).

关键词： Ne-Ar MaPE-ICP Langmuir probe OES electron temperature electron density mode transition

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Game Theory Based Decision Coordination Strategy of Agricultural Logistics Service Information System

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Computers, Materials & Continua 2022年第10期73卷 513-532页

作者： Long Guo Dongsheng Sun abdul waheed Huijie Gao Institute of Agricultural Economics and Development CAASBeijing100081China School of Business and Economics University of Management and TechnologyLahore54660Pakistan Beijing Information Science and Technology University Beijing100192China

Under the background of“Internet plus”rapid development,the agricultural logistics industry should apply information technology to every link of the agricultural product logistics industry *** making full use of the decision making module of the agricultural logistics information system,we can realize the full sharing of information and data resources,which makes the decision-making scheme of the agricultural logistics information system more *** real economic society,the uncertainty and mismatch between the customer’s logistics service demand and the logistics service capability that the logistics service function provider can provide,that is,when the two information are asymmetric,how to use the third-party contract to coordinate the income and profit distribution of the two,to make the information system decision making more reasonable?This paper mainly studies the coordination scheme of agricultural logistics information system decision making under uncertain output and demand information by introducing the spot market.A joint coordination strategy based on revenue sharing and penalty feedback contracts proposes decentralized decision making based on game *** show that the flexible ordering strategy proposed in this paper can reduce the logistics service supply chain’s uncertainty and significantly improve the logistics service supply chain’s overall income level through coordination contracts.

关键词： Game theory decision coordination strategy agricultural logistics information system logistics service supply chain(LSSC)

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A survey on trust based detection and isolation of malicious nodes in ad-hoc and sensor networks

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Frontiers of Computer Science 2015年第2期9卷 280-296页

作者： Adnan AHMED Kamalrulnizam ABU BAKAR Muhammad Ibrahim CHANNA Khalid HASEEB abdul waheed KHAN Faculty of Computing Universiti Teknologi Malaysia Johor Bahru 81310 Malaysia Department of Information Technology Quaid-e-Awam University of Engineering Science and Technology Nawabshah 67450 Pakistan

Mobile ad-hoc networks （MANETs） and wireless sensor networks （WSNs） have gained remarkable apprecia- tion and technological development over the last few years. Despite ease of deployment, tremendous applications and significant advantages, security has always been a challeng- ing issue due to the nature of environments in which nodes operate. Nodes＇ physical capture, malicious or selfish behav- ior cannot be detected by traditional security schemes. Trust and reputation based approaches have gained global recog- nition in providing additional means of security for decision making in sensor and ad-hoc networks. This paper provides an extensive literature review of trust and reputation based models both in sensor and ad-hoc networks. Based on the mechanism of trust establishment, we categorize the state- of-the-art into two groups namely node-centric trust mod- els and system-centric trust models. Based on trust evidence, initialization, computation, propagation and weight assign- ments, we evaluate the efficacy of the existing schemes. Fi- nally, we conclude our discussion with identification of some unresolved issues in pursuit of trust and reputation manage- ment.

关键词： trust reputation wireless sensor network mo-bile ad-hoc networks routing node misbehavior

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Specific Capacitance and Cyclic Stability of Graphene Based Metal/Metal Oxide Nanocomposites:A Review

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Journal of Materials Science & Technology 2015年第7期31卷 699-707页

作者： abdul waheed Anwar abdul Majeed Nadeem Iqbal Wasi Ullah Ahmad Shuaib Usman Ilyas Fozia Bibi Hafiz Muhammad Rafique Nanotechnologies Research Centre Department of PhysicsUniversity of Engineering and Technology Under Graduate Block/School of Physical Sciences University of the Punjab Department of Physics University of the Punjab

Graphene has become a worldwide admired material among researchers and scientists equally due to its unique richness in mechanical strength, electrical conductivity, optical and thermal properties. Re- searchers have explored that the composite materials based on graphene and metal/metal oxide nanostructures possess excellent potential for energy storage technologies. In particular, supercapacitors based on such composite materials have engrossed the extreme interest of researchers for its rapid charging/discharging time, safe operation and longer cyclic constancy. Till now, several fabrication techniques for composite materials and their energy storage applications have been explored. Here, specially, we have concentrated on the hottest research progress for the fabrication of graphene oxide and metal/metal oxide nanocomposites. We also emphasized on the characteristics and properties of supercapacitors fabricated using these composite materials. Moreover, our study is focused on the specific capacitance and cyclic stability of various composites to haul out the most efficient material for supercapacitor applications.

关键词： GrapheneMetal/metal oxide nanostructureSupercapacitor

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Ergodic Capacity Evaluation of Multi-Hop Decode-and-Forward MIMO-OFDM Relaying Network

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Computers, Materials & Continua 2021年第9期68卷 3133-3145页

作者： Latif Jan Mohammad Haseeb Zafar abdul waheed Mahdi Zareei Faisal Alanazi Department of Electrical Engineering University of Engineering&TechnologyPeshawar25120Pakistan Department of Information Technology Hazara UniversityMansehra21120Pakistan Tecnologico de Monterrey School of Engineering and SciencesZapopan45201Mexico Department of Electrical Engineering Prince Sattam Bin Abdulaziz UniversityCollege of EngineeringAl Kharj16278Saudi Arabia

Spatial diversity plays a significant role in wireless communication systems,including the Fourth Generation(4G)and Fifth Generation(5G)systems,and it is expected to be a fundamental part of the future wireless communication systems as *** Multiple-Input Multiple-Output(MIMO)technology,which is included in the IEEE 802.16j standard,still holds the most crucial position in the 4G spectrum as it promises to improve the throughput,capacity,spectral,and energy efficiency of wireless communication systems in the *** makes MIMO a viable technology for delay constrained medical and health care *** paper presents an approximate closed-form expression of the ergodic capacity for the Decode-and-Forward(DF)protocol MIMO-Orthogonal Frequency Division Multiplexing(OFDM)relaying *** MIMO-OFDM is highly valuable for modern high-speed wireless communication systems,especially in the medical sciences,its performance degrades in multi-hop relay ***,in this paper,an approximate closed-form expression is derived for an end-to-end ergodic capacity of multi-hop DF MIMO-OFDM wireless communication system has been ***-Carlo simulations are conducted to verify the performance of the presented analysis regarding the capacity(bits/s/Hz)for different SNR-dB values for single,2×2,4×4,and multi-hop DF MIMOOFDM *** presented results provide useful insights for the research on the end-to-end ergodic capacity evaluation.

关键词： Multiple-input multiple-output system decode-and-forward protocol orthogonal frequency division multiplexing ergodic capacity

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Resource Allocation and Optimization in Device-to-Device Communication 5G Networks

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Computers, Materials & Continua 2021年第10期69卷 1201-1214页

作者： Fahad Ahmed Al-Zahrani Imran Khan Mahdi Zareei Asim Zeb abdul waheed Computer Engineering Department Umm Al-Qura UniversityMecca24381Saudi Arabia Department of Electrical Engineering University of Engineering and Technology PeshawarP.O.B.814Pakistan Tecnologico de Monterrey School of Engineering and SciencesZapopan45201Mexico Department of Computer Science Abbottabad University of Science and TechnologyHavelian22500Pakistan Department of Information Technology Hazara University MansehraMansehra21120Pakistan School of Electrical and Computer Engineering Seoul National UniversitySeoul08826Korea

The next-generation wireless networks are expected to provide higher capacity,system throughput with improved energy *** of the key technologies,to meet the demand for high-rate transmission,is deviceto-device(D2D)communication which allows users who are close to communicating directly instead of transiting through base stations,and D2D communication users to share the cellular user chain under the control of the cellular *** a new generation of cellular network technology,D2D communication technology has the advantages of improving spectrum resource utilization and improving system throughput and has become one of the key technologies that have been widely concerned in the ***,due to the sharing of cellular network resources,D2D communication causes severe interference to existing cellular *** of the most important factors in D2D communication is the spectrum resources utilization and energy consumption which needs considerable attention from research *** address these issues,this paper proposes an efficient algorithm based on the idea of particle swarm *** main idea is to maximize the energy efficiency based on the overall link optimization of D2D user pairs by generating an allocation matrix of spectrum and *** D2D users are enabled to reuse multiple cellular user’s resources by enhancing their total energy efficiency based on the quality of service constraints and the modification of location and speed in particle *** constraint also provides feasibility to solve the original fractional programming *** results indicate that the proposed scheme effectively improved the energy efficiency and spectrum utilization as compared with other competing alternatives.

关键词： 5G networks D2D communication resource allocation

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A Safe and Reliable Routing Mechanism of LEO Satellite Based on SDN

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Computers, Materials & Continua 2020年第7期64卷 439-454页

作者： Chao Guo Juan Guo Chanjuan Yu Zhaobin Li Cheng Gong abdul waheed Department of Electronics and Communication Engineering Beijing Electronic Science and Technology InstituteBeijing100070China Vocational and Technical College Guilin University of Electronic TechnologyBeihai536000China School of Computer and Communication Engineering University of Science and Technology BeijingBeijing100083China University of Management Technology Lahore55300Pakistan

Satellite networks have high requirements for security and data processing *** order to improve the reliability of the network,software-defined network(SDN)technology is introduced and a central controller is set in the *** to the characteristics of global perspective,control data separation,and centralized control of SDN,the idea of SDN is introduced to the design of the satellite network *** a result,satellite nodes are only responsible for data transmission,while the maintenance of the links and the calculation of routes are implemented by the *** the massive LEO satellite network based on SDN,a state evaluation decision routing mechanism is *** designed mechanism monitors the status of the entire network effectively and reduces the on-board load on the satellite *** best routing decision is made under the comprehensive consideration of the current and historical status of each inter-satellite link between Low Earth Orbit(LEO)satellite network *** calculation and storage requirements are controlled within a reasonable *** on the curve parameter transmission fuzzy encryption algorithm,a safe and reliable condition assessment decision routing mechanism(CADRM)is *** ensures that the personal information of the LEO satellite network can be transmitted safely and *** experimental simulation results show the improvement of network throughput,the reduction of packet loss rate and the enhancing of network reliability.

关键词： Route LEO satellite SDN state assessment inter-satellite link

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Land-Cover Classification and its Impact on Peshawar’s Land Surface Temperature Using Remote Sensing

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Computers, Materials & Continua 2022年第2期70卷 4123-4145页

作者： Shahab Ul Islam Saifullah Jan abdul waheed Gulzar Mehmood Mahdi Zareei Faisal Alanazi Department of Computer Science IQRA National UniversityPeshawar25124Pakistan Department of Computer Science City University of Science&Information TechnologyPeshawar25124Pakistan Department of Information Technology Hazara UniversityMansehra21120Pakistan School of Electrical and Computer Engineering Seoul National UniversitySeoul08826Korea Department of Computer Science and Information Technology University of Malakand23021Pakistan Tecnologico de Monterrey School of Engineering and SciencesZapopan45201Mexico Department of Electrical Engineering Prince Sattam Bin Abdulaziz UniversityCollege of EngineeringAl Kharj16278Saudi Arabia

Spatial and temporal informationon urban infrastructure is essential and requires various land-cover/land-use planning and management ***,a change in infrastructure has a direct impact on other land-cover and climatic *** study assessed changes in the rate and spatial distribution of Peshawar district’s infrastructure and its effects on Land Surface Temperature(LST)during the years 1996 and *** this purpose,firstly,satellite images of bands7 and 8 ETM+(Enhanced Thematic Mapper)plus and OLI(Operational Land Imager)of 30 m resolution were ***,for classification and image processing,remote sensing(RS)applications ENVI(Environment for Visualising Images)and GIS(Geographic Information System)were ***,for better visualization and more in-depth analysis of land sat images,pre-processing techniques were *** Land use and Land cover(LU/LC)four types of land cover areas were identified-vegetation area,water cover,urbanized area,and infertile land for the years under *** composition of red,green,and near infra-red bands was used for supervised *** images were extracted for analyzing the relative infrastructure change.A comparative analysis for the classification of images is performed for SVM(Support Vector Machine)and ANN(Artificial Neural Network).Based on analyzing these images,the result shows the rise in the average temperature from 30.04℃ to 45.25℃.This only possible reason is the increase in the built-up area from 78.73 to 332.78 Area km^(2) from 1996 to *** has also been witnessed that the city’s sides are hotter than the city’s center due to the barren land on the borders.

关键词： Remote sensing temperature extraction urbanization satellite image classification artificial neural network support vector machine LU/LC land surface temperature

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Protected Fair Secret Sharing Based Bivariate Asymmetric Polynomials in Satellite Network

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Computers, Materials & Continua 2022年第9期72卷 4789-4802页

作者： Yanyan Han Jiangping Yu Guangyu Hu Chenglei Pan Dingbang Xie Chao Guo abdul waheed Department of Electronics and Communication Engineering Beijing Electronics Science and Technology InstituteBeijing100070China State Key Laboratory of Integrated Services Networks Xidian UniversityXi’an710126China Department of Cryptography and Technology Beijing Electronics Science and Technology InstituteBeijing100070China Department of Cyberspace Security Beijing Electronic Science and Technology InstituteBeijing100070China School of Communication Engineering Xidian UniversityXi’an710126China Institute of Information Engineering Chinese Academy of SciencesBeijing100093China University of Management Technology Lahore-Pakistan55300Pakistan

Verifiable secret sharing mainly solves the cheating behavior between malicious participants and the ground control center in the satellite *** verification stage can verify the effectiveness of secret shares issued by the ground control center to each participant and verify the effectiveness of secret shares shown by *** use a lot of difficult assumptions based on mathematical problems in the verification stage,such as solving the difficult problem of the discrete logarithm,large integer prime factorization,and so *** with other verifiable secret sharing schemes designed for difficult problems under the same security,the verifiable secret sharing scheme based on the Elliptic Curve Cryptography(ECC)system has the advantages of less computational overhead and shorter *** present,the binary polynomial is a single secret scheme and cannot provide effective ***,based on a Protected Verifiable Synchronous Multi Secret Sharing(PVS-MSS)scheme,this paper is designed based on bivariate asymmetric *** advanced verifiable attribute is introduced into the Protected Secret Sharing(PSS)*** paper extends the protected synchronous multi-secret sharing scheme based on bivariate polynomial *** ECC system constructs the security channel between the ground control center and participants and constructs the verification *** the verification algorithm,any participant can verify the consistency and effectiveness of the secret shadow and secret share received from other participants or presented by the secret distribution ***,no additional key agreement protocol is required;participants do not need to negotiate the session key for encryption;the secret share polynomial can generate the session key between participants and speed up the secret reconstruction *** verification stage has lower computational complexity than the verifiable scheme constructed by Rivest Shamir Adleman (RS

关键词： Multi-secret sharing binary asymmetric verifiable synchronization protected satellite network

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