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Plasma Science and Technology 2021年第2期23卷 17-29页

作者： Hafiz Imran Ahmad QAZI muhammad ajmal khan Jianjun HUANG SZU-CASIPP Joint Laboratory for Applied Plasma College of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhen 518060People's Republic of China Department of Engineering Physics Tsinghua UniversityBeijing 100084People's Republic of China

A discharge ignited by an AC power source in contact with deionized water as one of the electrodes is *** after initiation,the discharge exhibits a unique phenomenon:the gas-phase discharge is extended into the ***,a cone-like structure is observed at the liquid *** monitoring of current–voltage characteristics and liquid properties versus time suggests that the discharge shapes are functions of the liquid *** spatio-temporal profiles indicate the potential effects of water,ambient air impurities,and metastable argon on the discharge *** becomes more obvious near the liquid surface due to increasing production of various transient reactive species such as centerdot OH and NO ***,it is revealed that thermalization of the rotational population distributions of the rotational states(N′⩽6,J′⩽13/2)in the Q1 branch of the OH(A2Σ+,υ′=0→X2Π3/2,υ′′=0)band ro-vibrational system is influenced by the humid environment near the liquid *** addition,the transient behaviors of instantaneous concentrations of long-lived reactive species(LRS)such as H2O2,NO−2,and NO−3 are observed with lengthening the discharge *** production of multiple transient and LRS proposes AC excited gas–liquid argon discharge as a potential applicant in industrial wastewater cleaning,clinical medicine,and agriculture.

关键词： gas–liquid interface discharge emission patterns rotational temperature plasma chemistry

Physicochemical properties of the AC- excited helium discharges using a water electrode

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Plasma Science and Technology 2018年第7期20卷 112-120页

作者： Hafiz Imran Ahmad QAZI Yiying XIN muhammad ajmal khan Heping LI Lu ZHOU Chengyu BAO Department of Engineering Physics Tsinghua University Beijing 100084 People's Republic of China School of Environment Tsinghua University Beijing 100084 People's Republic of China

In this paper, the AC-excited helium discharges generated between the powered needle electrode enclosed in a conical quartz tube and the grounded de-ionized water electrode are investigated. The current and voltage waveforms exhibit a transition from the glow-like to streamer-like mode discharges, which forms a stable cone-shaped structure at the gas-liquid interface. In this region, the air and water vapor diffusion initiate various physical-chemical processes leading to substantial changes of the primary species emission intensities （e.g., OH, N2, NO, and O） and the rotational temperatures. The experimentally measured rotational temperature at the gas-liquid interface is 870 K from the Nz（C-B） band with a power input of 26 W. With the prolongation of the discharge time, significant changes in the discharge voltage and current, discharge emission patterns, instantaneous concentrations of the secondary species （e.g., H202, NO2, and NO3） in the liquid phase, pH values and electrical conductivities of the liquids are observed experimentally. The present study is helpful for deepening the understandings to the basic physical-chemical processes in the discharges in contact with liquids, especially to those occurring in the vicinity of the gas-liquid interface, and also for promoting existing and potential applications of such type of discharges in the fields of environmental protection, biomedicine, agriculture, and so on.

关键词： solution plasma gas-liquid interface wastewater treatment biomedical science and agriculture applications

Improving the Efficiency of Water Splitting and Oxygen Reduction Via Single-Atom Anchoring on Graphyne Support

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Energy & Environmental Materials 2024年第5期7卷 272-282页

作者： Shamraiz Hussain Talib Beenish Bashir muhammad ajmal khan Babar Ali Sharmarke Mohamed Ahsanulhaq Qurashi Jun Li Advanced Materials Chemistry Center(AMCC) Khalifa University of Science and TechnologyAbu Dhabi P.O.Box 127788UAE Department of Chemistry Khalifa University of Science and TechnologyAbu Dhabi P.O.Box 127788UAE Department of Chemistry and Biochemistry George Mason University4400 University DriveFairfaxVirginia 22030USA Interdisciplinary Research Center for Refining and Advanced Chemicals King Fahd University of Petroleum&MineralsDhahran 31261Saudi Arabia Department of Chemistry and Engineering Research Center of Advanced Rare-Earth Materials of Ministry of Education Tsinghua UniversityBeijing 100084China Department of Chemistry and Guangdong Provincial Key Laboratory of Catalytic Chemistry Southern University of Science and TechnologyShenzhen 518055China

Single-atom catalysts(SACs)have received significant interest for optimizing metal atom utilization and superior catalytic performance in hydrogen evolution reaction(HER),oxygen evolution reaction(OER),and oxygen reduction reaction(ORR).In this study,we investigate a range of single-transition metal(STM_(1)=Sc_(1),Ti_(1),V_(1),Cr_(1),Mn_(1),Fe_(1),Co_(1),Ni_(1),Cu_(1),Zr_(1),Nb_(1),Mo_(1),Ru_(1),Rh_(1),Pd_(1),Ag_(1),W_(1),Re_(1),Os_(1),Ir_(1),Pt_(1),and Au_(1))atoms supported on graphyne(GY)surface for HER/OER and ORR using first-principle *** initio molecular dynamics(AIMD)simulations and phonon dispersion spectra reveal the dynamic and thermal stabilities of the GY *** exceptional stability of all supported STM_(1)atoms within the H1 cavity of the GY surface exists in an isolated form,facilitating the uniform distribution and proper arrangement of single atoms on *** particular,Sc_(1),Co_(1),Fe_(1),and Au_(1)/GY demonstrate promising catalytic efficiency in the HER due to idealisticΔG_(H^(*))values via the Volmer-Heyrovsky ***,Sc_(1)and Au_(1)/GY exhibit superior HER catalytic activity compared to other studied ***_(1)/GY catalyst exhibits higher selectivity and activity for the OER,with an overpotential(0.46 V)comparable to MoC_(2),IrO_(2),and RuO_(2).Also,Rh_(1)and Co_(1)/GY SACs exhibited promising electrocatalysts for the ORR,with an overpotential of 0.36 and0.46 V,***,Co_(1)/GY is a versatile electrocatalyst for metal-air batteries and *** study further incorporates computational analysis of the kinetic potential energy barriers of Co_(1)and Rh_(1)in the OER and ORR.A strong correlation is found between the estimated kinetic activation barriers for the thermodynamic outcomes and all proton-coupled electron transfer *** establish a relation for the Gibbs free energy of intermediates to understand the mechanism of SACs supported on STM,/GY and introduce a key *** stu

关键词： Oxygen Reduction Reaction Graphyne Support Hydrogen Evolution Reaction Oxygen Evolution Reaction Single-Atom Catalyst Water Splitting

Influences of the inner diameter of the solid shielding tube on the characteristics of the radio-frequency cold atmospheric plasma jet

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Plasma Science and Technology 2019年第9期21卷 82-90页

作者： Jing LI Heping LI Department of Engineering Physics Tsinghua University

Active control of the local environment of the cold atmospheric plasma(CAP) jet is of great importance in actual applications since the CAP operates in an open atmosphere with the inevitable entrainment of the surrounding cold air. In this paper, the solid shielding effects of the cylindrical quartz tubes with different inner diameters on the characteristics of the CAP jets driven by a radio-frequency(RF) power supply are studied experimentally. The experimental results show that the total length of the shielded plasma jet can be increased significantly by an appropriate combination of the quartz tube inner diameter and that of the plasma generator nozzle exit with other parameters being unchanged. This phenomenon may be qualitatively attributed to the loss of diffusion of the charged particles in the radial direction under different inner diameters of the quartz tubes. Compared with the plasma free jet, the plasma shielding jet is produced with optimized parameters including longer plasma jet length, higher concentrations of chemically reactive species, higher rotational, vibrational, and electron excitation temperatures when the inner diameters of the solid shielding tube and the generator nozzle exit are the same. A maximum plasma jet length of 52.0 cm is obtained in contrast to that of 5.0 cm of the plasma free jet in this study. The experimental results indicate that the solid shielding effect provides a new method for the active control of the local environment of the RF-CAP jet operating in an open atmosphere.

关键词： cold atmospheric plasma jet radio-frequency glow discharge solid shielding effect effect of the tube inner diameter active control of plasma jet characteristics

Characteristics of a radio-frequency cold atmospheric plasma jet produced with a hybrid cross-linear-field electrode configuration

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Plasma Science and Technology 2019年第5期21卷 102-112页

作者： Jing LI Heping LI Department of Engineering Physics Tsinghua University

Cold atmospheric plasma(CAP)jet has wide applications in various fields including advanced materials synthesis and modifications,biomedicine,environmental protection and energy saving,*** control on the volume,temperature and chemically reactive species concentratio ns of the CAP jet is of great importance in actual *** this paper,an radio-frequency atmospheric-pressure glow discharge(RF-APGD)plasma generator with a hybrid cross-linear-field electrode configuration is *** experimental results show that,with the aid of the copper mesh located at the downstream of the traditional co-axial-type plasma generator with a cross-field electrode configuration,a linear field between the inner powered electrode of the traditional plasma generator and the copper mesh can be *** linerfield can,to some extent,enhance the discharges at the upstream of the copper mesh,resulting in small increments(all less than 12.5%)of the species emission intensities,electron excitation temperatures and gas temperatures by keeping other parameters being *** due to the intrinsic transparent and conducting features of the grounded copper mesh to the gas flowing,electric current and heat flux of the plasma plumes,a plasma region with higher concentrations of chemically reactive species and larger plasma plume diameters is obtained at the downstream of the grounded copper mesh on the same level of the gas temperature and electron excitation temperature compared to those of the plasma free *** addition,the charged particle number densities at the same downstream axial location of the grounded copper mesh decrease significantly compared to those of the plasma free *** means that the copper mesh is also,to some extent,helpful for separating the chemically reactive neutral species from the charged particles in side a plasma *** preceding results indicate that the cross-linear-field electrode configuration of the plasma generator

关键词： cold atmospheric plasma hybrid-cross-linear-field electrode configuration grounded copper mesh plasma jet characteristics modulation

Traditional ethno-botanical uses of medicinal plants from coastal areas of Pakistan

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Journal of Coastal Life Medicine 2014年第1期 22-30页

作者： muhammad Qasim Zainul Abideen muhammad Yousuf Adnan Raziuddin Ansari Bilquees Gul muhammad ajmal khan Institute of Sustainable Halophyte Utilization University of Karachi-75270KarachiPakistan Qatar Shell Professorial Chair of Sustainable Development Department of International AffairsCollege of Arts and SciencesQatar UniversityPO Box 2713DohaQatar

Objective:To document the traditional uses of wild plants as medicine by the villagers along the coastal highway from Karachi to ***:Information presented in this research was gathered from the local people using an integrated approach of floral collections,discussions with the elderly people and traditional medicinal practitioners using semi-structured ***:27 families in the targeted *** of the plants(54%)from this coastal plant diversity were xerophytes followed by halophytes/xero-halophytes(40%)and glycophytes(6%).The most important uses included gastrointestinal diseases,pain killer,arthritis,skin and sexual disorders,asthma and *** above-ground parts of plants ***,stem and fruit/seed as decoction are used most commonly to cure 23 ailments but root was also used in some ***:Ethno-medicinal surveys indicated the medicinal importance of 54 plant species from phyto-medicinal claim and it is hoped that it will lead to detailed chemical and pharmacological *** may also lead to a discovery of novel bioactive compounds for food and pharmaceutical *** study helps in documenting therapeutic uses of herbal remedies with new *** sc lmaiamy aanldso i tl iesa hdo tpoe da tdhiastc iot vweirlyl loeaf dn otov edle tbaiioleadc tcihveem ciocmalp aonudn pdhs afromr afcoooldog aicnadl pharmaceutical industries.

关键词： Arabian Sea Halophytes Herbal medicine Karachi Salt tolerant Uthal

Exploring Nanoscale Perovskite Materials for Next‑Generation Photodetectors:A Comprehensive Review and Future Directions

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Nano-Micro Letters 2025年第2期17卷 46-108页

作者： Xin Li Sikandar Aftab Maria Mukhtar Fahmid Kabir muhammad Farooq khan Hosameldin Helmy Hegazy Erdi Akman State Key Laboratory of Pulsed Power Laser Technology National University of Defense TechnologyHefei 230037AnhuiPeople’s Republic of China Anhui Laboratory of Advanced Laser Technology Hefei 230037AnhuiPeople’s Republic of China Nanhu Laser Laboratory Changsha 410015HunanPeople’s Republic of China Department of Semiconductor Systems Engineering and Clean Energy Sejong UniversitySeoul 05006Republic of Korea Department of Artificial Intelligence and Robotics Sejong UniversitySeoul 05006Republic of Korea School of Engineering Science Simon Fraser UniversityBurnabyBC V5A 1S6Canada Department of Electrical Engineering Sejong UniversitySeoul 05006South Korea Department of Physics Faculty of ScienceKing Khalid UniversityP.O.Box 9004AbhaSaudi Arabia Central Labs King Khalid UniversityAlQura’aP.O.Box 96061413 AbhaSaudi Arabia Scientific and Technological Research and Application Center Karamanoglu Mehmetbey University70100 KaramanTurkey

The rapid advancement of nanotechnology has sparked much interest in applying nanoscale perovskite materials for photodetection *** materials are promising candidates for next-generation photodetectors(PDs)due to their unique optoelectronic properties and flexible synthesis *** review explores the approaches used in the development and use of optoelectronic devices made of different nanoscale perovskite architectures,including quantum dots,nanosheets,nanorods,nanowires,and *** a thorough analysis of recent literature,the review also addresses common issues like the mechanisms underlying the degradation of perovskite PDs and offers perspectives on potential solutions to improve stability and scalability that impede widespread *** addition,it highlights that photodetection encompasses the detection of light fields in dimensions other than light intensity and suggests potential avenues for future research to overcome these obstacles and fully realize the potential of nanoscale perovskite materials in state-of-the-art photodetection *** review provides a comprehensive overview of nanoscale perovskite PDs and guides future research efforts towards improved performance and wider applicability,making it a valuable resource for researchers.

关键词： Nanoscale perovskites Photodetectors Nanosheets Nanorods Nanowires Quantum dots Nanocrystals

Modeling and Comprehensive Review of Signaling Storms in 3GPP-Based Mobile Broadband Networks:Causes,Solutions,and Countermeasures

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Computer Modeling in Engineering & Sciences 2025年第1期142卷 123-153页

作者： muhammad Qasim khan Fazal Malik Fahad Alturise Noor Rahman Department of Computer Science Iqra National UniversityPeshawar25000Pakistan Department of Cybersecurity College of ComputerQassim UniversityBuraydah52555Saudi Arabia Department of Computer Science and Engineering Al-Fayha CollegeAl Jubayl31961Saudi Arabia

Control signaling is mandatory for the operation and management of all types of communication networks,including the Third Generation Partnership Project(3GPP)mobile broadband ***,they consume important and scarce network resources such as bandwidth and processing *** have been several reports of these control signaling turning into signaling storms halting network operations and causing the respective Telecom companies big financial *** paper draws its motivation from such real network disaster incidents attributed to signaling *** this paper,we present a thorough survey of the causes,of the signaling storm problems in 3GPP-based mobile broadband networks and discuss in detail their possible solutions and *** provide relevant analytical models to help quantify the effect of the potential causes and benefits of their corresponding *** important contribution of this paper is the comparison of the possible causes and solutions/countermeasures,concerning their effect on several important network aspects such as architecture,additional signaling,fidelity,etc.,in the form of a *** paper presents an update and an extension of our earlier conference *** our knowledge,no similar survey study exists on the subject.

关键词： Signaling storm problems control signaling load analytical modeling 3GPP networks smart devices diameter signaling mobile broadband data access data traffic mobility management signaling network architecture 5G mobile communication

Assessment of Genetic Variation Within Indian Mustard (Brassica juncea) Germplasm Using Random Amplified Polymorphic DNA Markers

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Journal of Integrative Plant Biology 2008年第4期50卷 385-392页

作者： muhammad Ayub khan Malik Ashiq Rabbani muhammad Munir Saifullah khan ajmal muhammad Azim Malik Oilseed Research Program National Agricultural Research Center Park Road Islamabad 45500 Pakistan Institute of Agri-Biotechnology & Genetic Resources National Agricultural Research Center Park Road Islamabad 45500 Pakistan University of Arid Agriculture Rawalpindi Pakistan

Genetic diversity among 45 Indian mustard （Brassica juncea L.） genotypes comprising 37 germplasm collections, five advance breeding lines and three improved cultivars was investigated at the DNA level using the random amplified polymorphic DNA （RAPD） technique. Fifteen primers used generated a total of 92 RAPD fragments, of which 81 （88%） were polymorphic. Of these, 13 were unique to accession ‘Pak85559＇. Each primer produced four to nine amplified products with an average of 6.13 bands per primer. Based on pairwise comparisons of RAPD amplification products, Nei and Li＇s similarity coefficients were calculated to evaluate the relationships among the accessions. Pairwise similarity indices were higher among the oilseed accessions and cultivars showing narrow ranges of 0.77-0.99. An unweighted pair-group method with arithmetic averages cluster analysis based on these genetic similarities placed most of the collections and oilseed cultivars close to each other, showing a low level of polymorphism between the accessions used. However, the clusters formed by oilseed collections and cultivars were comparatively distinct from that of advanced breeding lines. Genetically, all of the accessions were classified into a few major groups and a number of individual accessions. Advanced breeding lines were relatively divergent from the rest of the accessions and formed independent clusters. Clustering of the accessions did not show any pattern of association between the RAPD markers and the collection sites. A low level of genetic variability of oilseed mustard was attributed to the selection for similar traits and horticultural uses. Perhaps close parentage of these accessions further contributed towards their little diversity. The study demonstrated that RAPD is a simple and fast technique to compare the genetic relationship and pattern of variation among the gene pool of this crop.

关键词： Brassica juncea genetic diversity germplasm oilseed mustard Pakistan random amplified polymorphic DNA.

EA-RDSP: Energy Aware Rapidly Deployable Wireless Ad hoc System for Post Disaster Management

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Computers, Materials & Continua 2021年第11期69卷 1725-1746页

作者： ajmal khan Mubashir Mukhtar Farman Ullah muhammad Bilal Kyung-Sup Kwak Department of Electrical and Computer Engineering COMSATS University IslamabadAttock43600Pakistan Division of Computer and Electronics Systems Engineering Hankuk University of Foreign StudiesYongin-si17035Korea Department of Information and Communication Engineering Inha UniversityIncheon22212Korea

In post disaster scenarios such as war zones floods and earthquakes,the cellular communication infrastructure can be lost or severely *** such emergency situations,remaining in contact with other rescue response teams in order to provide inputs for both headquarters and disaster survivors becomes very ***,in this research work,a design,implementation and evaluation of energy aware rapidly deployable system named EA-RDSP is *** proposed research work assists the early rescue workers and victims to transmit their location information towards the remotely located *** EA-RDSP,two algorithms are proposed i.e.,Hop count Assignment(HCA)algorithm and Maximum Neighbor Selection(MNS)*** EA-RDSP contains three types of nodes;the client node sends information about casualty in the disaster area to the server,the relay nodes transmit this information from client node to server nodes via multi-hop transmission,the server node receives messages sent by client node to alert rescue *** EAM-RDSP contains three types of nodes;the client node sends information about casualty in the disaster area to the server,the relay nodes transmit this information from client node to server nodes via multi-hop transmission,the server node receives messages sent by client node to alert rescue *** proposed EA-RDSP scheme is simulated using NS2 simulator and its performance is compared with existing scheme in terms of end-to-end delay,message delivery ratio,network overhead and energy consumption.

关键词： Disaster management neighbor selection device-to-device communication multi-hop relaying energy efficiency