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Spatio-temporal evolution characteristics and pattern formation of a gas–liquid interfacial AC current argon discharge plasma with a deionized water electrode

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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

Degradation of malathion by Pseudomonas during activated sludge treatment system using principal component analysis (PCA)

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Journal of Environmental Sciences 2006年第4期18卷 797-804页

作者： Hashmi imran Khan M Altaf Kim Jong-Guk Institute of Environmental Science and Engineering National University of S ciences and Technology Tamiz uddin Road Rawalpindi Pakistan Institute of E nvironmental Studies University of Karachi Karachi-75270 Pakistan Departm ent of Environmental Engineering Research Center of Industrial Technology Chon buk National University 664-14 Duckjin-Dong 1-Gu Chonju 560-756 South Korea

Popular descriptive multivariate statistical method currently employed is the principal component analyses （PCA） method. PCA is used to develop linear combinations that successively maximize the total variance of a sample where there is no known group structure. This study aimed at demonstrating the performance evaluation of pilot activated sludge treatment system by inoculating a strain of Pseudomonas capable of degrading malathion which was isolated by enrichment technique. An intensive analytical program was followed for evaluating the efficiency of biosimulator by maintaining the dissolved oxygen （DO） concentration at 4.0 mg/L. Analyses by high performance liquid chromatographic technique revealed that 90% of malathion removal was achieved within 29 h of treatment whereas COD got reduced considerably during the treatment process and mean removal efficiency was found to be 78%. The mean pH values increased gradually during the treatment process ranging from 7.36-8.54. Similarly the mean ammonia-nitrogen （NH3-N） values were found to be fluctuating between 19.425-28.488 mg/L, mean nitrite-nitrogen （NO3-N） ranging between 1.301- 2.940 mg/L and mean nitrate-nitrogen （NO3-N） ranging between 0.0071-0.0711 mg/L. The study revealed that inoculation of bacterial culture under laboratory conditions could be used in bioremediation of environmental pollution caused by xenobiotics. The PCA analyses showed that pH, COD, organic load and total malathion concentration were highly correlated and emerged as the variables controlling the first component, whereas dissolved oxygen, NO3-N and NH3-N governed the second component. The third component repeated the trend exhibited by the first two components.

关键词： activated sludge system malathion, principal component analyses (PCA) raw wastewater removal efficiency

Flow of Eyring-Powell liquid due to oscillatory stretchable curved sheet with modified Fourier and Fick’s model

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Applied Mathematics and Mechanics(English Edition) 2021年第10期42卷 1461-1478页

作者： M.imran Z.ABBAS M.NAVEED Department of Mathematics The Islamia University of BahawalpurBahawalpur 63100Pakistan Department of Mathematics Khwaja Fareed University of Engineering&Information TechnologyRahim Yar Khan 64200Pakistan

This study deals with the features of the mass and heat transport mechanism by adopting a modified version of Fourier and Fick’s model known as the CattaneoChristov double diffusive *** time-dependent magnetohydrodynamic(MHD)flow of the Eyring-Powell liquid across an oscillatory stretchable curved sheet in the presence of Fourier and Fick’s model is *** acquired set of flow equations is transformed into the form of nonlinear partial differential equations(PDEs)by applying appropriate similarity variables.A convergent series solution to the developed nonlinear equations is accomplished with the help of an analytical approach,i.e.,the homotopy analysis method(HAM).The consequences of diverse parameters,including the dimensionless EyringPowell liquid parameter,the radius of curvature,the Schmidt/Prandtl numbers,the ratio of the oscillatory frequency of the sheet to its stretchable rate constant,the mass and thermal relaxation variables involved in the flow,and the heat and mass properties,are displayed through graphs and *** is noted from this study that the amplitude of the pressure distribution rises for the high parametric values of the Eyring-Powell parameter.

关键词： oscillatory stretchable curved surface magnetohydrodynamic(MHD) Eyring-Powell liquid Cattaneo-Christov double diffusion analytical technique

CuPc/C_(60) heterojunction thin film optoelectronic devices

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Journal of Semiconductors 2010年第6期31卷 47-49页

作者： imran Murtaza Ibrahim Qazi Khasan S.Karimov GIK Institute of Engineering Sciences and Technology Physical Technical Institute of Academy of Sciences Rudaki Ave.33 Dushanbe Pakistan Physical Technical Institute of Academy of Sciences Rudaki Ave.33Dushanbe

The optoelectronic properties of heterojunction thin film devices with ITO/CuPc/C_（60）/Al structure have been investigated by analyzing their current-voltage characteristics,optical absorption and *** this organic photovoltaic device,CuPc acts as an optically active layer,C_（60） as an electron-transporting layer and ITO and Al as *** is observed that,under illumination,excitons are formed,which subsequently drift towards the interface with C_（60）,where an internal electric field is *** excitons that reach the interface are subsequently dissociated into free charge carriers due to the electric field present at the *** experimental results show that in this device the total current density is a function of injected carriers at the electrode-organic semiconductor surface,the leakage current through the organic layer and collected photogenerated current that results from the effective dissociation of excitons.

关键词： organic semiconductor optoelectronic device thin film heterojunction CuPc C_(60)

Spanning Simplicial Complexes of Uni-Cyclic Graphs

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Algebra Colloquium 2015年第4期22卷 707-710页

作者： imran Anwar Zahid Raza Agha Kashif COMSATS Institute of Information Technology Lahore Pakistan National University of Computer and Emerging Sciences Lahore Campus Pakistan National University of Computer and Emerging Sciences Lahore Campus Pakistan Department of Mathematics University of Management and Technology

In this paper, we introduce the concept of the spanning simplicial complex As（G） associated to a simple finite connected graph G. We characterize all spanning trees of the uni-cyclic graph Un,m. In particular, we give a formula for computing the Hilbert series and h-vector of the Stanley-Reisner ring k[△s（Un,m）]. Finally, we prove that the spanning simplicial complex △s（Un,m） is shifted and hence is shellable.

关键词： primary decomposition Hilbert series f-vector h-vector spanning tree

Degradation of methotrexate by UV/peroxymonosulfate:Kinetics,effect of operational parameters and mechanism

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Chinese Journal of Chemical Engineering 2020年第10期28卷 2658-2667页

作者： Muhammad imran Kanjal Majid Muneer Amal Abdelhaleem Wei Chu Department of Civil and Environmental Engineering The Hong Kong Polytechnic UniversityHung HomKowloon 999077Hong KongChina Department of Chemistry Government College UniversityFaisalabad 38000Pakistan

Methotrexate(MTX)is one of the most consumed anti-cancer drugs in the pharmaceutical market around the *** widespread occurrence of MTX in aquatic environment through hospital effluent has attracted increasing concern due to its potential to induce water *** the present study,the degradation of MTX in aqueous medium was investigated by UV-activated peroxymonosulfate(PMS).A significant improvement in degradation rate by increasing UV intensity and PMS concentration while the decrease in degradation efficiency with the increase of solution p H and initial concentration of MTX was *** proposed UV/PMS process could achieve more than 90%MTX degradation in 30 min with a good mineralization degree(65%).A pseudofirst order kinetic model was employed and successfully predicted the degradation of *** effect of other operational parameters such as the initial concentration of the targeted compound,dosage of oxidant(PMS),solution p H and UV intensity on the degradation rate were *** the last,the main transform intermediates were identified using LC–MS and possible degradation pathways were *** results show that UV/PMS can be used as an efficient technology to treat pharmaceuticals such as methotrexate containing water and wastewater.

关键词： Peroxymonosulfate UV radiation Advanced oxidation process Methotrexate

Impact of radiation pressure and circumstellar dust on motion of a test particle in Manev’s field

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Astrodynamics 2021年第2期5卷 77-89页

作者： Jagadish Singh Solomon Okpanachi Omale Lawrence O.Inumoh Felix ale Department of Mathematics Faculty of Physical SciencesAhmadu Bello UniversityZariaNigeria Engineering and Space Systems Department National Space Research and Development Agency(NASRDA)Obasanjo Space CentreAbujaNigeria

In this paper,we present a study on the impact of radiation pressure and circumstellar dust on the motion of a test particle in the framework of the restricted four-body problem under the Manev’s *** show that the distribution of equilibrium points on the plane of motion is slightly different from that of the classical Newtonian *** the aid of the Lyapunov characteristic exponents,we show that the system is sensitive to changes in initial conditions;hence,the orbit of the system is found to be chaotic in the phase space for the given initial ***,a numerical application of this model to a stellar system(Gliese 667C)is considered,which validates the dependence of the equilibrium points on the mass *** show that the non-collinear equilibrium points of this stellar system are distributed symmetrically about the x-axis,and five of them are linearly *** basins of attraction of the system show that the equilibrium points have irregular boundaries,and we use the energy integral and the Manev parameter to illustrate the zero-velocity curves showing the permissible region of motion of the test particle with respect to the Jacobi constant.

关键词： Manev potential circumstellar dust Lyapunov characteristic exponents(LCEs) stability chaos basins of attraction

Ground and Low-Lying Collective States of Rotating Three-Boson System

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Communications in Theoretical Physics 2016年第4期65卷 473-482页

作者： Mohd.imran M.A.H.Ahsan Department of Physics Jamia Millia Islamia (Central University)

The ground and low-lying collective states of a rotating system of N=3 bosons harmonically confined in quasi-two-dimension and interacting via repulsive finite-range Gaussian potential is studied in weakly to moderately interacting *** N-body Hamiltonian matrix is diagonalized in subspaces of quantized total angular momenta 0 ≤ L ≤ 4N to obtain the ground and low-lying *** numerical results show that breathing modes with N-body eigenenergy spacing of 2hω⊥,known to exist in strictly 2D system with zero-range(δ-function) interaction potential,may as well exist in quasi-2D system with finite-range Gaussian interaction *** gain an insight into the many-body states,the von Neumann entropy is calculated as a measure of quantum correlation and the conditional probability distribution is analyzed for the internal structure of the *** the rapidly rotating regime the ground state in angular momentum subspaces L=(q/2)N(N-1) with q=2,4 is found to exhibit the anticorrelation structure suggesting that it may variationally be described by a Bose–Laughlin like *** further observe that the first breathing mode exhibits features similar to the Bose–Laughlin state in having eigenenergy,von Neumann entropy and internal structure independent of interaction for the three-boson system considered *** the contrary,for eigenstates lying between the Bose–Laughlin like ground state and the first breathing mode,values of eigenenergy,von Neumann entropy and internal structure are found to vary with interaction.

关键词： Bose–Einstein condensation exact diagonalization breathing mode Bose–Laughlin state von Neumann entropy conditional probability distribution

Dynamic characteristics of nanoindentation in Ni:A molecular dynamics simulation study

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Chinese Physics B 2012年第11期21卷 367-372页

作者： Muhammad imran Fayyaz Hussain Muhammad Rashid S.A.Ahmad Department of Physics Simulation Lab Islamia University of Bahawalpur 63100Pakistan Department of Physics National University of Singapore 117542Singapore

In this work, three-dimensional molecular dynamics simulation is carried out to elucidate the nanoindentation behaviour of single crystal Ni. The substrate indenter system is modelled using hybrid interatomic potentials including the manybody potential （embedded atom method） and two-body Morse potential. The spherical indenter is chosen, and the simulation is performed for different loading rates from 10 m/s to 200 m/s. Results show that the maximum indentation load and hardness of the system increase with the increase of velocity. The effect of indenter size on the nanoindentation response is also analysed. It is found that the maximum indentation load is higher for the large indenter whereas the hardness is higher for the smaller indenter. Dynamic nanoindentation is carried out to investigate the behaviour of Ni substrate to multiple loading-unloading cycles. It is observed from the results that the increase in the number of loading unloading cycles reduces the maximum load and hardness of the Ni substrate. This is attributed to the decrease in recovery force due to defects and dislocations produced after each indentation cycle.

关键词： indentation nanocrystalline loading-unloading dislocation