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Slip flow of m.xwell viscoelasticity-based m.cropolar nanoparticles with porous m.dium. a num.rical study

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Applied m.them.tics and m.chanics(English Edition) 2019年第9期40卷 1255-1268页

作者： H. WAQAS m. imran S. U. KHAN S. A. SHEHZAD m. A. m.RAJ Departm.nt of m.them.tics Government College University Faisalabad Faisalabad 38000 Pakistan Departm.nt of m.them.tics COMSATS University Islamabad Sahiwal 57000 Pakistan

This article presents the m.ss and heat transport aspects in viscoelastic nanofluid flows under the presence of velocity slip conditions. To explore the nonNewtonian behavior, a m.xwell viscoelasticity-based m.cropolar is considered. m.reover, a porous m.dium.saturates the stretching sheet. A set of sim.larity variables is introduced to derive the dim.nsionless ordinary differential equations of velocity, concentration, and tem.erature profiles. The num.rical solution is com.uted by using the m.TLAB bvp4c package. The salient flow features of velocity, concentration, and tem.erature profiles are described and discussed through various graphs. It is observed that with an increase in the slip param.ter, the m.cro-rotation velocity also increases. The tem.erature of nanoparticles gets m.xim.m.values by varying the viscoelastic param.ter and the porosity param.ter while an opposite trend is noted for the m.cro-rotation param.ter. The local Nusselt num.er and the local Sherwood num.er increase by increasing the viscoelastic param.ter, the porosity param.ter, and the slip velocity param.ter. The graphical com.utation is perform.d for a specified range of param.ters, such as 0 ≤ m.≤ 2.5, 0 ≤σm.≤ 2.5, 0 ≤ K1 ≤ 1.5, 0.5 ≤ Pr ≤ 3.0, 0 ≤σ≤ 1.5, 0.5 ≤ Sc ≤ 2.0, 0.2 ≤ Nb ≤ 0.8, and 0.2 ≤ Nt ≤ 0.8.

关键词： viscoelasticity-based m.cropolar nanofluid porous m.dium slip effect num.rical m.thod

Inexpensive synthesis of a high-perform.nce Fe3O4-SiO2-TiO2 photocatalyst： m.gnetic recovery and reuse

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Frontiers of Chem.cal Science and Engineering 2016年第3期10卷 405-416页

作者： Nadir Abbas Godlisten N. Shao Syed m. imran m.ham.ad S. Haider Hee Taik Kim Departm.nt of Chem.cal Engineering Hanyang University Ansan-si Gyeonggi-do 426-791 Republic of Korea Departm.nt of Civil and Environm.ntal Engineering Hanyang University Ansan-si Gyeonggi-do 426-791 Republic of Korea Departm.nt of Chem.cal Engineering University of Gujrat HH Campus Punjab Pakistan

A sol-gel technique has been developed for the synthesis of a m.gnetite-silica-titania （Fe3O4-SiO2-TiO2） tertiary nanocom.osite with im.roved photocatalytic properties based on the use of inexpensive titania and silica precursors. The exceptional photocatalytic activity of the resulting m.terials was dem.nstrated by using them.to photocatalyze the degradation of m.thylene blue solution. The best form.lation achieved 98% m.thylene blue degradation. An interesting feature of the present work was the ability to m.gnetically separate and reuse the catalyst. The efficiency of the catalyst rem.ined high during two reuses. The synthesized nanom.terials were characterized by X-ray diffraction （XRD）, scanning electron m.croscopy （SEm., transm.ssion electron m.cro- scopy （TEm., Fourier transform.infrared （FTIR） spectro- scopy, ultra-violet-visible spectroscopy, diffuse reflectance spectroscopy, and therm.gravim.tric analysis. XRD ana- lysis revealed the form.tion of m.lticrystalline system. of cubic m.gnetite and anatase titania crystals. SEm.and TEm.characterization revealed well-developed and hom.- geneously dispersed particles of size less than 15 nm. FTIR spectra confirm.d the chem.cal interaction of titania and silica. It was further noticed that the optical properties of the prepared m.terials were dependent on the relative contents of their constituent m.tal oxides.

关键词： sol-gel photocatalysis m.gnetic recovery,TiO2 Fe3O4 SiO2

Transport m.chanism.in chem.cally reactive hybrid nanofluid flow containing gyrotactic m.cro-organism. over a curved oscillatory surface

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Applied m.them.tics and m.chanics(English Edition) 2025年第1期46卷 177-192页

作者： m.NAVEED m.imran T.ASGHAR Z.ABBAS Departm.nt of m.them.tics Division of Science and TechnologyUniversity of Education Departm.nt of m.them.tics The Islamia University of Bahawalpur

This paper exam.nes the transport analysis, including both heat transfer and m.ss transfer, in hybrid nanofluid flow containing gyrotactic m.croorganism. towards a curved oscillatory surface. The influence of m.gnetic fields is also inspected in term. of their physical characteristics. To depict the phenom.na of transport, m.dified versions of both Fick's and Fourier's laws are used. Additionally, the characteristics of both heterogeneous and hom.geneous chem.cal reactions are also incorporated. Utilizing a curvilinear coordinate system. the flow problem.is form.lated as partial differential equations(PDEs)for m.m.ntum. concentration, m.croorganism.field, and energy. An analytical solution to the obtained flow equations is achieved utilizing the hom.topy analysis m.thod(HAm..The effects of significant flow param.ters on the pressure and m.croorganism.fields, velocity, oscillation velocity, concentration, and tem.erature distributions are shown via graphs. Furtherm.re, the variations in skin friction, m.ss transfer rate, heat transfer rate, and local m.tile num.er due to different involved param.ters are presented in tables and are analyzed in detail. Graphical results indicate that the curves of velocity and tem.erature fields are enhanced as the values of the solid volum. fraction variables *** is also verified that the concentration rate field decreases as the values of the hom.geneous reaction strength param.ter and the radius of curvature param.ter increase, and it increases with the Schm.dt num.er and the heterogeneous reaction strength *** outcom.s show a favorable response of the m.tile num.er to advanced values of the Peclet num.er, the Schm.dt num.er, the m.croorganism.difference param.ter, and the bio-convective Lewis num.er.

关键词： hybrid nanofluid oscillating curved stretchable sheet gyrotactic m.croorganism Cattaneo-Christov heat and m.ss flux chem.cal reaction analytical solution O368

Rem.val of heavy m.tals through adsorption using sand

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Journal of Environm.ntal Sciences 2003年第3期15卷 413-416页

作者： m. Ali Awan Ishtiaq A. Qazi imran Khalid Institute of Environm.ntal Science and Engineering (IESE) National University of Sciences & Technology (NUST) Rawalpindi PakistanPakistan Council of Renewable Energy TechnologiesInstitute of Environmental Science and Engineering (IESE) National University of Sciences & Technology (NUST) Rawalpindi Pakistan Islamabad Pakistan

The rem.val of four heavy m.tals i.e. Pb, Cr, Cu, and Zn from.their aqueous solutions, using ordinary sand as an adsorbent, was studied at 20℃. The am.unt of m.tal adsorbed to form.m.nolayer on sand(a_m., obtained from.Langm.ir isotherm. exhibited the preference of m.tals for sand in the order Pb>Cr>Cu>Zn. The heavy m.tal-sand adsorption phenom.na can be illustrated on the basis of the interaction between surface functional group of silicates (sand) and the m.tal ions. It is deduced that sand can be used as a low cost adsorbent for the rem.val of heavy m.tal from.wastewater (containing low conc. of m.tals), especially in the developing countries.

关键词： sand heavy m.tals adsorption

Enhancem.nt of the Sensitivity of Gas Sensor Based on m.crostructure Optical Fiber

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Photonic Sensors 2015年第4期5卷 312-320页

作者： m.nir m.RSHED m.. imran HASAN S. m. Abdur RAZZAK Departm.nt of lnform.tion and Com.unication Technology Mawlana Bhashani Science and Technology University Tangail-1902 Bangladesh Departm.nt of Electronics & Telecom.unication Engineering Rajshahi University of Engineering & Technology Rajshahi-6204 Bangladesh Departm.nt of Electrical & Electronic Engineering Rajshahi University of Engineering & Technology Rajshahi-6204 Bangladesh

This paper proposes the design and characterization of m.crostructure optical fiber for gas sensing applications. The aim.is to detect toxic and colorless gases over a wide transm.ssion band covering 0.80 gm.to 2.00gm.wavelength. Num.rical investigation is carried out by using the finite elem.nt m.thod （FEm.. The num.rical study shows that sensitivity of the proposed sensor is m.derately increased by introducing four non-circular holes around the defected core of photonic crystal fiber and the confinem.nt loss is also reduced. Furtherm.re, we confirm.that increasing the diam.ter of central air core and size of the non-circular holes can im.rove the relative sensitivity and the confinem.nt loss is reduced by increasing the diam.ter of air holes in the cladding. The enhancem.nt of the relative sensitivity is m.re than 27.58% （0.1323 to 0.1688） at the wavelength 2=1.33gm.that is the absorption line of m.thane （CH4） and hydrogen fluoride （HF） gases. The confinem.nt loss of the fiber is 1.765x 10-8dB/m.

关键词： Confinem.nt loss gas sensor hollow core photonic crystal fiber m.crostrucm.e fiber relativesensitivity

Flow of Eyring-Powell liquid due to oscillatory stretchable curved sheet with m.dified Fourier and Fick’s m.del

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Applied m.them.tics and m.chanics(English Edition) 2021年第10期42卷 1461-1478页

作者： m.imran Z.ABBAS m.NAVEED Departm.nt of m.them.tics The Islamia University of BahawalpurBahawalpur 63100Pakistan Departm.nt of m.them.tics Khwaja Fareed University of Engineering&Information TechnologyRahim Yar Khan 64200Pakistan

This study deals with the features of the m.ss and heat transport m.chanism.by adopting a m.dified version of Fourier and Fick’s m.del known as the CattaneoChristov double diffusive *** tim.-dependent m.gnetohydrodynam.c(m.D)flow of the Eyring-Powell liquid across an oscillatory stretchable curved sheet in the presence of Fourier and Fick’s m.del is *** acquired set of flow equations is transform.d into the form.of nonlinear partial differential equations(PDEs)by applying appropriate sim.larity variables.A convergent series solution to the developed nonlinear equations is accom.lished with the help of an analytical approach,i.e.,the hom.topy analysis m.thod(HAm..The consequences of diverse param.ters,including the dim.nsionless EyringPowell liquid param.ter,the radius of curvature,the Schm.dt/Prandtl num.ers,the ratio of the oscillatory frequency of the sheet to its stretchable rate constant,the m.ss and therm.l relaxation variables involved in the flow,and the heat and m.ss properties,are displayed through graphs and *** is noted from.this study that the am.litude of the pressure distribution rises for the high param.tric values of the Eyring-Powell param.ter.

关键词： oscillatory stretchable curved surface m.gnetohydrodynam.c(m.D) Eyring-Powell liquid Cattaneo-Christov double diffusion analytical technique

Neurogenesis dynam.cs in the olfactory bulb:deciphering circuitry organization, function, and adaptive plasticity

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Neural Regeneration Research 2025年第6期20卷 1565-1581页

作者： m.awiah m.Naffaa Departm.nt of Psychology and Neuroscience Duke UniversityDurhamNCUSA Departm.nt of Cell Biology Duke University School of MedicineDurhamNCUSA

Adult neurogenesis persists after birth in the subventricular zone, with new neurons m.grating to the granule cell layer and glom.rular layers of the olfactory bulb, where they integrate into existing circuitry as inhibitory interneurons. The generation of these new neurons in the olfactory bulb supports both structural and functional plasticity, aiding in circuit rem.deling triggered by m.m.ry and learning processes. However, the presence of these neurons, coupled with the cellular diversity within the olfactory bulb, presents an ongoing challenge in understanding its network organization and function. m.reover,the continuous integration of new neurons in the olfactory bulb plays a pivotal role in regulating olfactory inform.tion processing. This adaptive process responds to changes in epithelial com.osition and contributes to the form.tion of olfactory m.m.ries by m.dulating cellular connectivity within the olfactory bulb and interacting intricately with higher-order brain regions. The role of adult neurogenesis in olfactory bulb functions rem.ins a topic of debate. Nevertheless, the functionality of the olfactory bulb is intricately linked to the organization of granule cells around m.tral and tufted cells. This organizational pattern significantly im.acts output, network behavior, and synaptic plasticity, which are crucial for olfactory perception and m.m.ry. Additionally, this organization is further shaped by axon term.nals originating from.cortical and subcortical regions. Despite the crucial role of olfactory bulb in brain functions and behaviors related to olfaction, these com.lex and highly interconnected processes have not been com.rehensively studied as a whole. Therefore, this m.nuscript aim. to discuss our current understanding and explore how neural plasticity and olfactory neurogenesis contribute to enhancing the adaptability of the olfactory system. These m.chanism. are thought to support olfactory learning and m.m.ry, potentially through increased

关键词： network adaptability neurogenesis neuronal com.unication olfactory bulb olfactory learning olfactory m.m.ry synaptic plasticity

Hum.dity Effect on Transport Properties of Titanium.Dioxide Nanoparticles

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Journal of m.terials Science & Technology 2014年第8期30卷 748-752页

作者： m.ham.ad Usm.n Kam.an Rasool S. S. Batool Z. imran m.shtaq Ahm.d Hira Jam.l m. A. Rafiq m. m. Hasan m.cro and Nano Devices Group Department of Metallurgy and Materials Engineering(DMME)Pakistan Institute of Engineering and Applied Sciences(PIEAS)P. O. NiloreIslamabad 45650Pakistan

Rutile TiO2 nanoparticles were synthesized using co-precipitation m.thod with an average diam.ter of 30 nm.TiO2 nanoparticle device was then fabricated on glass *** electrodes were defined using photolithography and vacuum.evaporation.A suspension of TiO2 nanoparticles was prepared in isopropanol using ultrasonic *** nanoparticles were deposited between the *** device was tested by AC electrical m.asurem.nts at 40%-90%relative hum.dity（RH）.The im.edance of the TiO2nanoparticles decreases by about 80 tim.s with the increase in RH from.40%to 90%at 100 *** response tim. and the recovery tim. were 4 s and 5 s,respectively between 40%and 90%*** 100 Hz,the sensitivity of the alum.num.electrode TiO2 nanoparticle device in the range of 40%—90%RH was17 m./%*** m.dulus analysis also confirm. the increase in DC conductivity of TiO2 nanoparticles as RH increases.

关键词： TiO2 nanoparticles Co-precipitation Transport properties

Degradation of m.lathion by Pseudom.nas during activated sludge treatm.nt system.using principal com.onent analysis (PCA)

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Journal of Environm.ntal Sciences 2006年第4期18卷 797-804页

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

Popular descriptive m.ltivariate statistical m.thod currently em.loyed is the principal com.onent analyses （PCA） m.thod. PCA is used to develop linear com.inations that successively m.xim.ze the total variance of a sam.le where there is no known group structure. This study aim.d at dem.nstrating the perform.nce evaluation of pilot activated sludge treatm.nt system.by inoculating a strain of Pseudom.nas capable of degrading m.lathion which was isolated by enrichm.nt technique. An intensive analytical program.was followed for evaluating the efficiency of biosim.lator by m.intaining the dissolved oxygen （DO） concentration at 4.0 m./L. Analyses by high perform.nce liquid chrom.tographic technique revealed that 90% of m.lathion rem.val was achieved within 29 h of treatm.nt whereas COD got reduced considerably during the treatm.nt process and m.an rem.val efficiency was found to be 78%. The m.an pH values increased gradually during the treatm.nt process ranging from.7.36-8.54. Sim.larly the m.an am.onia-nitrogen （NH3-N） values were found to be fluctuating between 19.425-28.488 m./L, m.an nitrite-nitrogen （NO3-N） ranging between 1.301- 2.940 m./L and m.an nitrate-nitrogen （NO3-N） ranging between 0.0071-0.0711 m./L. The study revealed that inoculation of bacterial culture under laboratory conditions could be used in biorem.diation of environm.ntal pollution caused by xenobiotics. The PCA analyses showed that pH, COD, organic load and total m.lathion concentration were highly correlated and em.rged as the variables controlling the first com.onent, whereas dissolved oxygen, NO3-N and NH3-N governed the second com.onent. The third com.onent repeated the trend exhibited by the first two com.onents.

关键词： activated sludge system m.lathion, principal com.onent analyses (PCA) raw wastewater rem.val efficiency