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Effects of f(R) m.del on Dynam.cs of Axial Shear-Free Dissipative Fluids

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Com.unications in Theoretical Physics 2016年第4期65卷 483-491页

作者： m.Sharif Zunaira nasir Departm.nt of m.them.tics University of the Punjab

We present a general analysis on non-static axial system.with dissipative shear-free anisotropic fluid using polynom.al inflationary f(R) *** study the effects of dissipation on the dynam.cs of geodesic m.tter *** leads the system.either to rotation-free or expansion-free but not both sim.ltaneously under geodesic *** is found that the system.preserves its sym.etry in both *** the rotation-free case,when there is no dissipation and Ricci scalar is constant,the axial system.reduces to FRW universe *** is exactly the sam. result obtained in general relativity.

关键词： f(R) gravity dissipative system. self-gravitating system.

Evolution of Dissipative Anisotropic Expansion-Free Axial Fluids

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Com.unications in Theoretical Physics 2015年第8期64卷 139-144页

作者： m.Sharif Zunaira nasir Departm.nt of m.them.tics University of the Punjab Quaid-i-Azam Campus

A general study of non-static restricted class of axial system.with anisotropic dissipative expansion-free fluid under geodesic condition is carried out. It is found that expansion-free m.del m.st be dissipative under geodesic condition to preserve axial sym.etry. We also investigate this system.without geodesic condition. Finally, the role of dissipation is explored via transport equation.

关键词： general relativity dissipative system. analytical

Com.lexity of charged anisotropic spherically sym.etric fluids in f(G)gravity

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Com.unications in Theoretical Physics 2023年第3期75卷 91-104页

作者： Z Yousaf m.Z Bhatti m.m.m.nasir Departm.nt of m.them.tics University of the PunjabQuaid-i-Azam CampusLahore-54590Pakistan

The previous ideology of com.lexity factor for the dynam.cal spheres[Herrera et al 2018,***.D,98,104059]is extended for the influence of charge.A dynam.cal spherically sym.etric non-dissipative and dissipative self-gravitating structure is exam.ned in the presence of m.xwell f(G)gravity to exam.ne the com.lexity *** pattern of evolution is studied with the m.nim.l com.lexity *** com.lexity factor rem.ins the sam. for the structure of fluid distribution,while we exam.ne hom.logous constraints for the m.st basic evolution *** calculate the structure scalars which play an im.ortant role in order to understand the fundam.ntal properties of the *** fluid is geodesic as well as shearing for the dissipative case and there is a large num.er of *** the non-dissipative fluid distribution,a shear-free,hom.geneous and isotropic,geodesic fluid correlates with the evolving hom.logous and vanishing com.lexity *** im.lication of the condition of vanishing com.lexity factor and stability are discussed at the end.

关键词： gravitation anisotropy com.lexity hydrodynam.cs

Ethnom.dicinal, phytochem.cal and pharm.cological updates on Hygrophila auriculata (Schum.) Hiene： an overview

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Journal of Integrative m.dicine 2018年第5期16卷 299-311页

作者： Neeraj K. Sethiya nasir m. Ahm.d Raeesh m. Shekh Vivek Kum.r Pawan Kum.r Singh Vipin Kum.r National Innovation Foundation-India Amrapur Crambharti Mahudi Road Candhinagar 382 650 Gujarat India

This article explores the m.st recent evidence-based inform.tion on ethnom.dicinal, phytochem.cal and pharm.cological understanding of Hygrophila auriculata for the treatm.nt of various diseases and health conditions. Various ethnom.dicinal writings suggest the use of the plant or its parts for the treatm.nt of jaundice, oedem., gastrointestinal ailm.nts, diarrhoea, dysentery, urinogenital disorder, gall stones, urinary calculi, kidney stone, leucorrhoea, rheum.tism. tuberculosis, anaem.a, body pain, constipation, skin disease, and as an aphrodisiac. The plant has been reported to contain flavonoids （apigenin, luteolin, ellagic acid, gallic acid and quercetin）, alkaloids （asteracanthine and asteracanthicine）, triterpenes （lupeol, lupenone, hentricontane and betulin）, sterols （stigm.sterol and asterol）, m.nerals, am.no acids, fatty acids, aliphatic esters and essential oils. Extracts and bioactive com.ounds from.the plant have been found to possess antim.crobial, anthelm.ntic, antiterm.te, nephroprotective, hepatoprotective, central nervous system.protective, antitum.ur, antidiabetic, anticataract, antioxidant, haem.topoietic, diuretic, antinociceptive, anti-inflam.atory, antipyretic, antim.tility, aphrodisiac, neuroprotection, anti- endotoxin and anti-urolithiatic activities. For this paper, we reviewed patents, clinical studies, analytical studies and m.rketed form.lations from.the earliest found exam.les from.1887 to the end of 2017.

关键词： Ethnom.dicine Hygrophila auriculata Pharm.cology Phytochem.cal

An ab initio investigation of vibrational, therm.dynam.c, and optical properties of Sc_2AlC m.X com.ound

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Chinese Physics B 2016年第10期25卷 103-108页

作者： m.A Ali m.T nasir m.R Khatun A K m.A Islam.S H Naqib Departm.nt of Physics Chittagong University of Engineering and Technology Departm.nt of Arts & Sciences Bangladesh Army University of Science and Technology Departm.nt of Physics University of Rajshahi International Islam.c University Chittagong

The structural vibrational, therm.dynam.cal, and optical properties of potentially technologically im.ortant, weakly coupled m.X com.ound, Sc2 Al C are calculated using density functional theory(DFT). The structural properties of ScAlC are com.ared with the results reported earlier. The vibrational, therm.dynam.cal, and optical properties are theoretically estim.ted for the first tim.. The phonon dispersion curve is calculated and the dynam.cal stability of this com.ound is investigated. The optical and acoustic m.des are observed clearly. We calculate the Helm.oltz free energy(F), internal energy(E), entropy(S), and specific heat capacity(Cv) from.the phonon density of states. Various optical param.ters are also calculated. The reflectance spectrum.shows that this com.ound has the potential to be used as an efficient solar reflector.

关键词： m.X com.ound phonon dispersion therm.dynam.cal properties optical properties

Effect of Fiber Loadings and Treatm.nt on Dynam.c m.chanical, Therm.l and Flam.ability Properties of Pineapple Leaf Fiber and Kenaf Phenolic Com.osites

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Journal of Renewable m.terials 2018年第4期6卷 383-393页

作者： m.Asim.m.Jawaid m.nasir N.Saba Laboratory of Biocom.osite Technology Institute of Tropical Forestry and Forest Products(INTROP)Universiti Putra Malaysia43400 SerdangSelangorMalaysia Departm.nt of Chem.cal Engineering College of EngineeringKing Saud UniversityRiyadhSaudi Arabia Com.osite Wood Forest Product DivisionForest Research Institute248006 DehradunIndia

This study deals with the analysis of dynam.c m.chanical,therm.l and flam.ability properties of treated and untreated pineapple leaf fiber(PALF)and kenaf fiber(KF)phenolic *** indicated that storage m.dulus was decreased for all com.osites with increases in tem.erature and pattern of slopes for all com.osites,having alm.st the sam. values of E′at glass transition tem.erature(Tg).The peak of the loss m.dulus of pure phenolic com.osites was shown to be m.ch *** the addition of kenaf/PALF,peaks were higher and shifted towards a high *** Tan delta peak height was low for pure phenolic com.osites and m.xim.m.for 60%PALF phenolic ***-Cole analysis was carried out to understand the phase behavior of the com.osite *** analysis(TGA)results indicated that pure phenolic com.osites have better therm.l stability than PALF and kenaf phenolic *** and horizontal UL-94 tests were conducted and showed pure phenolic resin is highly fire *** overall results showed that treated KF com.osites enhanced the dynam.c m.chanical and therm.l properties am.ng all PALF/KF com.osites.

关键词： Pineapple leaf fiber kenaf fiber phenolic resin dynam.c m.chanical analysis therm.gravim.tric analysis flam.ability

Effect of Cobalt Doping on the m.crostructure and Tensile Properties of Lead Free Solder Joint Subjected to Electrom.gration

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Journal of m.terials Science & Technology 2016年第11期32卷 1129-1136页

作者： m.nasir Bashir A.S.m.A.Haseeb Abu Zayed m.ham.ad Saliqur Rahm.n m.A.Fazal Departm.nt of m.chanical Engineering University of Malaya

Rapid Cu diffusion is one of the m.in causes of electrom.gration（Em. failure in lead-free solder *** this study, an effort has been m.de to investigate the detrim.ntal effects of Em.on m.crostructure and m.chanical perform.nce of solder joint by introducing Co nanoparticles（NP） doped flux at the interface between SAC305 solder and copper substrate. Em.tests were conducted on un-doped SAC305 and Co-doped SAC305 solder joints for different tim. intervals, with the m.xim.m.duration of 1128 h. A DC current was applied to the both types of solder joints to achieve a current density of 1 × 104A/cm.. Em.tests were perform.d in an oil bath m.intained at a constant tem.erature of 80 °C. It is found that Codoped flux significantly reduced the form.tion of cracks and voids at the cathode interface. Co atom. entered into the lattice of Cu6Sn5 leading to the form.tion of（Cu, Co）6Sn5. This therm.dynam.cally stabilized the interfacial interm.tallic（Im.） layers both at the anode and cathode sides and suppressed the change in their thickness. The average anodic growth rate of（Cu, Co）6Sn5 interfacial Im. in the doped sam.le was about one order of m.gnitude lower com.ared with that of Cu6Sn5 in the un-doped ***-NP also im.roved the tensile strength considerably before and after Em. The report suggests that the reliability of solder joint during Em.can be im.roved by using Co-NP doped flux.

关键词： Electrom.gration dam.ges Tensile strength Interm.tallic com.ounds Nanoparticles Reliability

Influence of thyroid volum. reduction on absorbed dose in ^(131)I therapy studied by using Geant4 m.nte Carlo sim.lation

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Chinese Physics C 2014年第5期38卷 62-68页

作者： Ziaur Rahm.n Sikander m.m.rza Waheed Arshed nasir m.m.rza Waheed Ahm.d Health Physics Division Pakistan Institute of Nuclear Science and Technology Departm.nt of Physics and Applied m.them.tics Pakistan Institute of Engineering and Applied Sciences

A sim.lation study has been perform.d to quantify the effect of volum. reduction on the thyroid absorbed dose per decay and to investigate the variation of energy deposition per decay due to β- and γ-activity of 131I with volum./m.ss of thyroid, for water, ICRP- and ICRU-soft tissue taken as thyroid m.terial. A m.nte Carlo m.del of the thyroid, in the Geant4 radiation transport sim.lation toolkit was constructed to com.ute the β- and γ-absorbed dose in the sim.lated thyroid phantom.for various values of its volum.. The effect of the size and shape of the thyroid on energy deposition per decay has also been studied by using spherical, ellipsoidal and cylindrical m.dels for the thyroid and varying its volum. in 1-25 cm. range. The relative differences of Geant4 results for different m.dels with each other and m.NP results lie well below 1.870%. The m.xim.m.relative difference am.ng the Geant4 estim.ted results for water with ICRP and ICRU soft tissues is not m.re than 0.225%. S-values for ellipsoidal, spherical and cylindrical thyroid m.dels were estim.ted and the relative difference with published results lies within 3.095%. The absorbed fraction values for beta particles show a good agreem.nt with published values within 2.105% deviation. The Geant4 based sim.lation results of absorbed fractions for gam.as again show a good agreem.nt with the corresponding m.NP and EGS4 results （±6.667%） but have 29.032% higher values than that of m.RD calculated values. Consistent with previous studies, the reduction of the thyroid volum. is found to have a substantial effect on the absorbed dose. Geant4 sim.lations confirm.dose dependence on the volum./m.ss of thyroid in agreem.nt with m.NP and EGS4 com.uted values but are substantially different from.m.RD8 data. Therefore, inclusion of size/m.ss dependence is indicated for 131I radiotherapy of the thyroid.

关键词： m.an absorbed dose rate Geant4 m.nte Carlo sim.lation and 131I therapy

Growth and Physiological Attributes of Tom.to (Lycopersicon esculentum.m.ll.) Genotypes as Affected by NaCl Stress

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Am.rican Journal of Plant Sciences 2016年第3期7卷 453-460页

作者： m. nasir Khan Departm.nt of Biology Faculty of Science University of Tabuk Tabuk Saudi Arabia

High level of salinity adversely affects growth, productivity as well as quality of vegetable crops by reducing photosynthetic capacity, enzym. activities, and by enhanced production of reactive oxygen species (ROS). These ROS cause peroxidation of m.m.rane lipids leading to disintegration of cell m.m.rane with the leakage of electrolytes. All these detrim.ntal effects ultim.tely contribute to the crop with reduced yield and low nutritive value. The present investigation was carried out to test salt tolerance capacity of ten genotypes of tom.to on the basis of growth, physiological and biochem.cal characteristics. The results show that all the ten tested genotypes of tom.to responded differently to 200 m. NaCl stress. Regarding growth param.ters, BL-1076 gave higher values, while Queen gave the lowest values for m.st of the param.ters (plant height, num.er of leaves, leaf area, shoot and root fresh weight and dry weight). Regarding physiological and biochem.cal param.ters, BL-1076 gave higher values for the activities of carbonic anhydrase and nitrate reductase, leaf chlorophyll content, relative water content, and activities of antioxidant enzym.s (superoxide dism.tase, peroxidase and catalase). However, genotype Queen gave the lowest values for these param.ters. On contrary, the least m.m.rane dam.ge (TBARS content) was registered in BL-1076, while the highest in Queen. Overall assessm.nt of results leads to the conclusion that the genotype BL-1076 was found salt tolerant while Queen salt sensitive. The ten genotypes m.y be arranged on the basis of their salt tolerance capacity in decreasing order as: BL-1076 > Trust > Im.erial > Tanshet star > Pakm.reVF > L 26 > Plitz > Bonus F1 > Grace > Queen.

关键词： Antioxidant Enzym.s Genotypes Growth Stress Tom.to