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Simultaneous photoinduced generation of Fe^(2+) and H_2O_2 in rivers:An indicator for photo-Fenton reaction

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Journal of Environmental Sciences 2016年第9期28卷 34-38页

作者： khan m.G.mostofa Hiroshi Sakugawa institute of Surface-Earth System Science Tianjin University Graduate School of Biosphere Science Department of Environmental Dynamics and ManagementHiroshima University

The photo-Fenton reaction is a key source of the highly reactive hydroxyl radical（HOU） that is produced by the reaction of simultaneous photo-induced generation of Fe^（2＋）-dissolved organic matter（DOm） with H_2O_2 in sunlit surface waters as well as in the treatment of organic pollutants in the advanced oxidation processes（AOPs）.Concentrations of both H_2O_2 and Fe^（2＋）-DOm were dependent on time and total solar intensity flux,and their levels were highest in the diurnal samples collected at noon compared with the samples collected during the period before sunrise and after sunset.H_2O_2 and Fe^（2＋）-DOm concentrations during monthly readings were also found higher in comparison with the diurnal samples,shortly before sunrise or after sunset.A π-electron bonding system is formed between Fe and the functional groups in DOm（Fe-DOm）,through electron donation from the functional groups of DOm to an empty d-orbital of *** π-electron is loosely bound and is highly susceptible to a rapid excitation upon light exposure that will provide better understanding of the formation of aqueous electrons,superoxide radical anions,H_2O_2 and finally,photo-Fenton reactions,*** results imply that simultaneous generation of H_2O_2 and Fe^（2＋）-DOm upon sunlight exposure during the daytime is most likely to be the key photo-Fenton reaction pathway,taking place in surface waters.

关键词： Photo-Fenton reaction Fe^(3+) Fe^(2+) Dissolved organic matter H_2O_2 Light

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

Scalable ir‑Doped NiFe_(2)O_(4)/TiO_(2)Heterojunction Anode for Decentralized Saline Wastewater Treatment and H_(2)Production

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Nano-micro Letters 2025年第3期17卷 1-18页

作者： Sukhwa Hong Jiseon Kim Jaebeom Park Sunmi im michael r.Hoffmann Kangwoo Cho Division of Environmental Science and Engineering Pohang University of Science and Technology(POSTECH)Pohang 790−784Korea Linde Laboratory California Institute of TechnologyPasadenaCA 91125USA institute for Convergence research and Education in Advanced Technology(i‑CrEATE) Yonsei University International CampusIncheon 21983Republic of Korea

Wastewater electrolysis cells(WECs)for decentralized wastewater treatment/reuse coupled with H_(2)production can reduce the carbon footprint associated with transportation of water,waste,and energy *** study reports ir-doped NiFe_(2)O_(4)(NFi,~5 at%ir)spinel layer with TiO_(2)overlayer(NFi/TiO_(2)),as a scalable heterojunction anode for direct electrolysis of wastewater with circumneutral pH in a single-compartment *** dilute(0.1 m)NaCl solutions,the NFi/TiO_(2)marks superior activity and selectivity for chlorine evolution reaction,outperforming the benchmark irO_(2).robust operation in near-neutral pH was *** including operando X-ray absorption spectroscopy unveiled crucial roles of TiO_(2) which serves both as the primary site for Cl−chemisorption and a protective layer for NFi as an ohmic *** electrolysis of NH4+-laden synthetic wastewater demonstrated that NFi/TiO_(2)not only achieves quasi-stoichiometric NH_(4)^(+)-to-N_(2)conversion,but also enhances H_(2)generation efficiency with minimal competing reactions such as reduction of dissolved oxygen and reactive *** scaled-up WEC with NFi/TiO_(2)was demonstrated for electrolysis of toilet wastewater.

关键词： Wastewater electrolysis cell ir-doped NiFe_(2)O_(4) reactive chlorine species Decentralized H_(2)production On-site wastewater treatment

metabolic complications of psychotropic medications in psychiatric disorders:Emerging role of de novo lipogenesis and therapeutic consideration

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World Journal of Psychiatry 2024年第6期14卷 767-783页

作者： mohammad m khan Zaw Ali khan mohsin Ali khan Laboratory of Translational Neurology and molecular Psychiatry Department of BiotechnologyEra’s Lucknow Medical College and Hospitaland Faculty of ScienceEra UniversityLucknow 226003India Era’s Lucknow medical College and Hospital Era UniversityLucknow 226003India

Although significant advances have been made in understanding the pathophysiology of psychiatric disorders(PDs),therapeutic advances have not been very *** psychotropic medications can reduce classical symptoms in patients with PDs,their long-term use has been reported to induce or exaggerate various pre-existing metabolic abnormalities including diabetes,obesity and non-alcoholic fatty liver disease(NAFLD).The mechanism(s)underlying these metabolic abnormalities is not clear;however,lipid/fatty acid accumulation due to enhanced de novo lipogenesis(DNL)has been shown to reduce membrane fluidity,increase oxidative stress and inflammation leading to the development of the aforementioned metabolic ***,emerging evidence suggest that DNL dysregulation and fatty acid accumulation could be the major mechanisms associated with the development of obesity,diabetes and NAFLD after long-term treatment with psychotropic medications in patients with *** support of this,several adjunctive drugs comprising of anti-oxidants and antiinflammatory agents,that are used in treating PDs in combination with psychotropic medications,have been shown to reduce insulin resistance and development of *** conclusion,the above evidence suggests that DNL could be a potential pathological factor associated with various metabolic abnormalities,and a new avenue for translational research and therapeutic drug designing in PDs.

关键词： Psychotropic medications metabolic complications De novo lipogenesis Obesity Diabetes Non-alcoholic fatty liver disease

mass Transfer： a Deciding Factor for the multiplicity of an Event in Deep inelastic Collisions

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Chinese Physics Letters 2006年第10期23卷 2714-2716页

作者： Tabassum Nasir J.J.Baluch E.U.khan F.N.Khattak m.i.Shahzad Department of Physics Gomal University D.I. Khan Pakistan Department of Physics CIIT Islamabad Pakistan U.W.C. Gomal UniversityD.I.KhanPakistan physics research Division PINSTECH Islamabad Pakistan

intermediate stage of the three and four-pronged events is investigated in the reaction ^208Pb＋^197Au at beam energy 11.67 meV/u. multiprong events are analysed numerically using an empirical mass-dependent velocityrauge relation. Using the measured three-dimensional coordinates of correlated tracks, it is possible to determine the quantities such as mass transfer and total kinetic energy loss. These quantities are then used to study the intermediate stage of the reaction. it has been observed that mass transfer and total kinetic energy loss at the first step of the reaction decides the multiplicity of an event at the second stage of the sequential fission process.

关键词： HEAVY-iON iNTErACTiON miCA TrACK DETECTOrS CHANNELS FiSSiON U-238

Fractional soliton dynamics of electrical microtubule transmission line model with local m-derivative

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Communications in Theoretical Physics 2021年第9期73卷 17-25页

作者： Nauman raza Saima Arshed Kashif Ali khan mustafa inc Department of mathematics University of the PunjabQuaid-e-Azam CampusLahorePakistan Department of mathematics University of Engineering and TechnologyLahorePakistan Department of Computer Engineering Biruni UniversityIstanbulTurkey Department of mathematics Science FacultyFirat UniversityElazigTurkey Department of medical research Medical University HospitalChina Medical UniversityTaichungTaiwanChina

in this paper,two integrating strategies namely exp[-Ф(Х)]and (G'/G^(2))-expansion methods together with the attributes of local-m derivatives have been acknowledged on the electrical microtubule(mT)model to retrieve soliton *** said model performs a significant role in illustrating the waves propagation in nonlinear *** are also highly productive in signaling,cell motility,and intracellular *** proposed algorithms yielded solutions of bright,dark,singular,and combo fractional soliton *** significance of the fractional parameters of the fetched results is explained and presented vividly.

关键词： solitons solution microtubule nonlinear transmission line (G'/G^(2))-expansion method

modeling and numerical analysis of nanoliquid (titanium oxide, graphene oxide) flow viscous fluid with second order velocity slip and entropy generation

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Chinese Journal of Chemical Engineering 2021年第3期34卷 17-25页

作者： m.ijaz khan Seifedine Kadry Yuming Chu m.Waqas Department of mathematics Riphah International UniversityFaisalabad CampusFaisalabad 38000Pakistan Department of mathematics and Computer Science Beirut Arab UniversityBeirutLebanon Department of mathematics Huzhou UniversityHuzhou 313000China Hunan Provincial Key Laboratory of mathematical modeling and Analysis in Engineering Changsha University of Science&TechnologyChangsha 410114China NUTECH School of Applied Sciences and Humanities National University of TechnologyIslamabad 44000Pakistan

The prime objective of the present communication is to examine the entropy-optimized second order velocity slip Darcy–Forchheimer hybrid nanofluid flow of viscous material between two rotating *** conducting flow is considered and saturated through Darcy–Forchheimer *** the disks are rotating with different angular frequencies and stretches with different *** graphene oxide and titanium dioxide are considered for hybrid nanoparticles and water as a continuous phase *** heating,heat generation/absorption and viscous dissipation effects are incorporated in the mathematical modeling of energy ***,binary chemical reaction with activation energy is *** total entropy rate is calculated in the presence of heat transfer irreversibility,fluid friction irreversibility,Joule heating irreversibility,porosity irreversibility and chemical reaction irreversibility through thermodynamics second *** nonlinear governing equations are first converted into ordinary differential equations through implementation of appropriate similarity transformations and then numerical solutions are calculated through Built-in-Shooting *** of sundry flow variables on the entropy generation rate,velocity,concentration,Bejan number,temperature are discussed graphically for both graphene oxide and titanium dioxide hybrid *** engineering interest like skin friction coefficient and Nusselt number are computed numerically and presented through *** is noticed from the obtained results that entropy generation rate and Bejan number have similar effects versus diffusion *** entropy generation rate is more against the higher Brinkman number.

关键词： Darcy-Forchheimer porous medium Titanium dioxide and graphene oxide nanoparticles Second order velocity slip Convective boundary condition Activation energy Heat generation/absorption

interaction between compressibility and particulate suspension on peristaltically driven flow in planar channel

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Applied mathematics and mechanics(English Edition) 2017年第1期38卷 137-154页

作者： i.m.ELDESOKY S.i.ABDELSALAm r.m.ABUmANDOUr m.H.KAmEL K.VAFAi Department of Basic Engineering Sciences Faculty of EngineeringMenoufia UniversityMenoufia 32511Egypt Department of mechanical Engineering University of CaliforniaCalifornia 92521U.S.A. Basic Science Department Faculty of EngineeringThe British University in EgyptCairo 11837Egypt Department of Engineering mathematics and Physics Faculty of Engineering Cairo UniversityGiza 12613Egypt

The peristaltic pumping of a viscous compressible liquid mixed with rigid spherical particles of the same size in a channel is theoretically investigated. The momentum equations for the compressible flow are solved with a perturbation analysis. The analysis is carried out by duly accounting for the nonlinear convective acceleration terms for the fluid part on the wavy wall. The zeroth-order terms yield the Poiseuille flow, and the first-order terms give the Orr-Sommerfeld equation. The explicit expression for the net axial velocity is derived. The effects of the embedded parameters on the axial fluid velocity are studied through different engineering applications. The features of the flow characteristics are analyzed and discussed in detail. The obtained results are evaluated for various parameters associated with the blood flow in the blood vessels with diameters less than 5 500 μm, whereas the particle diameter has been taken to be 8 μm. This study provides a scope to evaluate the effect of the theory of two-phase flow characteristics with compressible fluid problems, and is helpful for understanding the role of engineering applications of pumping solid-fluid mixture by peristaltically driven motion.

关键词： two-phase flow peristaltic transport compressible liquid perturbation method

Dual Solutions of mHD Boundary Layer Flow of a micropolar Fluid with Weak Concentration over a Stretching/Shrinking Sheet

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Communications in Theoretical Physics 2017年第4期67卷 449-457页

作者： Z.H.khan m.Qasim Naeema ishfaq W.A.khan Department of mathematics University of MalakandChakdaraDir(Lower)Khyber PakhtunkhwaPakistan Department of mathematics COMSATS Institute of Information TechnologyPark RoadChak ShahzadIslamabadPakistan School of mathematical Sciences Peking UniversityBeijing 100871China Department of mechanical and industrial Engineering College of Engineering Majmaah UniversityMajmaah 11952Kingdom of Saudi Arabia

We investigate the dual solutions for the mHD flow of micropolar fluid over a stretching/shrinking sheet with heat transfer. Suitable relations transform the partial differential equations into the ordinary differential *** forms solutions are also obtained in terms of confluent hypergeometric function. This is the first attempt to determine the exact solutions for the non-linear equations of mHD micropolar fluid model. it is demonstrated that the microrotation parameter helps in increasing Nusselt number and the dual solutions exist for all fluid flow parameters under consideration. The dual behavior of dimensionless velocity, temperature, microrotation, skin-friction coefficient,local Nusselt number is displayed on graphs and examined.

关键词： mHD micropolar fluid stretching/shrinking sheet exact and dual solutions