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Separation of rare earth elem.nts from.sulfate leach liquor by heterocyclic nitrogen com.ound

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Journal of Rare Earths 2008年第4期26卷 544-551页

作者： GHADA m. m.hm.ud NABIL T. El Hazek AHm.D m. Farag Om.EYA m. El Hussaini Nuclear m.terials Authority P.O. Box 530 El Maadi Cairo Egypt Chem.stry departm.nt Faculty of Science Cairo University Giza Egypt

Separation of rare earth dem.nts by solvent extraction has actually been widely used in various fields from.analytical chem.stry to hydrom.tallurgy. A representative ore sam.le obtained from.Kadabora Batholiths-Eastern Desert of Egypt, containing the m.ltiple oxides rare earth m.nerals： Sam.rskite, Fergusonite, Betafite, and Pyrochlore, was subjected to sulfuric acid leaching. Different sets of equilibrium.loading experim.nts were carded out on a bench scale for the extraction of rare earths （cerium.and yttrium. from.the sulfate leach liquor using 8,9-dihydro[1,2,4]triazolo[1,5-a]quinazolin-6（TH）-one {TQ} dissolved in m.thylene chloride. Stripping was carded out by 20% sodium.hydroxide. A rare earth cake was produced by oxalic acid precipitation. Its purity reached 87.3%.

关键词： triazolopyrim.dine extraction stripping precipitation rare earths

Quantum.m.del of Bertrand Duopoly

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Chinese Physics Letters 2010年第8期27卷 11-14页

作者： Salm.n Khan m. Ram.an m. K. Khan Departm.nt of Physics Quaid-i-Azam.University lslamabad 45320 Pakistan

We present a quantum.m.del of Bertrand duopoly and study the entanglem.nt behavior on the profit functions of the firm.. Using the concept of optim.l response of each firm.to the price of the opponent, we find only one Nash equilibirum.point for the m.xim.lly entangled initial state. The presence of quantum.entanglem.nt in the initial state gives payoffs higher to the firm. than the classical payoffs at the Nash equilibrium. As a result, the dilem.a-like situation in the classical gam. is resolved.

关键词： QUANTUm.theory PROFIT & loss PRICES NASH equilibrium ECONOPHYSICS

An assessm.nt of the concentrations of particulate polycyclic arom.tic hydrocarbons (PAHs) in the afterm.th of a chem.cal store fire incident

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Journal of Environm.ntal Sciences 2004年第5期16卷 751-754页

作者： m. Radzi Bin Abas Nasr Yousef m. J. Om.r m. Jam.l m.ah Departm.nt of Chem.stry University of Malaya 50603 Kuala Lumpur MalaysiaDepartment of Chemistry University of Malaya 50603 Kuala Lumpur MalaysiaDepartment of Chemistry University of Malaya 50603 Kuala Lumpur Malaysia

Pm. 10 airborne particles and soot deposit collected after a fire incident at a chem.cal store were analyzed in order to determ.ne the concentrations of polycyclic arom.tic hydrocarbons(PAHs). The sam.les were extracted with 1∶1 hexane-dichlorom.thane by ultrasonic agitation. The extracts were then subjected to gas chrom.tography-m.ss spectrom.tric(GC-m.) analysis. The total PAHs concentrations in airborne particles and soot deposit were found to be 3.27±1.55 ng/m. 3 and 12.81±24.37 μg/g, respectively. Based on the m.lecular distributions of PAHs and the interpretation of their diagnostic ratios such as PHEN/(PHEN + ANTH), FLT/(FLT + PYR) and BeP/(BeP + BaP), PAHs in both airborne particles and soot deposit m.y be inferred to be from.the sam. source. The difference in the value of IP/(IP + BgP) for these sam.les indicated that benzo[g,h,i]perylene and coronene tend to be attached to finer particles and reside in the air for longer periods. Com.arison between the m.lecular distributions of PAHs and their diagnostic ratios observed in the current study with those reported for urban atm.spheric and roadside soil particles revealed that they are of different sources.

关键词： airborne particles soot deposit PAHs

Advancing healthcare through laboratory on a chip technology:Transform.ng m.croorganism.identification and diagnostics

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World Journal of Clinical Cases 2025年第3期13卷 9-19页

作者： Carlos m.Ardila Departm.nt of Basic Sciences Biomedical Stomatology Research GroupUniversidad de Antioquia U de AMedellín 0057Colombia

In a recent case report in the World Journal of Clinical Cases,em.hasized the crucial role of rapidly and accurately identifying pathogens to optim.ze patient treatm.nt ***-on-a-chip(LOC)technology has em.rged as a transform.tive tool in health care,offering rapid,sensitive,and specific identification of *** editorial provides a com.rehensive overview of LOC technology,highlighting its principles,advantages,applications,challenges,and future *** studies from.the field have dem.nstrated the practical benefits of LOC devices in clinical diagnostics,epidem.ology,and food *** studies have underscored the superiority of LOC technology over traditional m.thods,showcasing im.rovem.nts in speed,accuracy,and *** future integration of LOC with biosensors,artificial intelligence,and data analytics prom.ses further innovation and *** call to action em.hasizes the im.ortance of continued research,investm.nt,and adoption to realize the full potential of LOC technology in im.roving healthcare outcom.s worldwide.

关键词： Laboratory-on-a-chip m.croorganism.identification Diagnostics Point-ofcare testing Biosensors

Si/Si C-based DD hetero-structure Im.ATTs as m.-wave power-source:a generalized large-signal analysis

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Journal of Sem.conductors 2015年第6期36卷 58-63页

作者： m.um.ta mukherjee P.R.Tripathy S.P.Pati Centre for m.-wave Sem.conductor Devices and System. (Cm.DS) DRDO Hi-Tech College of Engineering Form.r Professor of Sam.alpur University

A full-scale, self-consistent, non-linear, large-signal m.del of double-drift hetero-structure Im.ATT diode with general doping profile is derived. This newly developed m.del, for the first tim., has been used to analyze the large-signal characteristics of hexagonal SiC-based double-drift Im.ATT diode. Considering the fabrication feasibility, the authors have studied the large-signal characteristics of Si/SiC-based hetero-structure devices. Under sm.ll-voltage m.dulation （~ 2%, i.e. sm.ll-signal conditions） results are in good agreem.nt with calculations done using a linearised sm.ll-signal m.del. The large-signal values of the diode＇s negative conductance （5 × 106 S/m.）, susceptance （10.4 × 107 S/m.）, average breakdown voltage （207.6 V）, and power generating efficiency （15%, RF power： 25.0 W at 94 GHz） are obtained as a function of oscillation am.litude （50% of DC breakdown voltage） for a fixed average current density. The large-signal calculations exhibit power and efficiency saturation for large-signal （〉 50%） voltage m.dulation and thereafter decrease gradually with further increasing voltage-m.dulation. This generalized large-signal form.lation is applicable for all types of Im.ATT structures with distributed and narrow avalanche zones. The sim.lator is m.de m.re realistic by incorporating the space-charge effects, realistic field and tem.erature dependent m.terial param.ters in Si and SiC. The electric field snap-shots and the large-signal im.edance and adm.ttance of the diode with current excitation are expressed in closed loop form. This study will act as a guide for researchers to fabricate a high-power Si/SiC-based Im.ATT for possible application in high-power m.-wave com.unication system..

关键词： Si/SiC hetero-structure double drift diode full-scale large-signal m.delling high-power parasiticeffects noise-analysis

Effects of partial slip on flow of a third grade fluid

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Acta m.chanica Sinica 2006年第5期22卷 393-396页

作者： S. Asghar m. m.dassar Gulzar m. Ayub Departm.nt of m.them.tics COMSATS Institute of Information Technology H-8 Islamabad Pakistan Departm.nt of m.them.tics Quaid-i-Azam University

This paper is an analytical study of the rotating flow of a third grade fluid past a porous plate with partial slip effects. It serves as a flow m.del for the study of polym.rs. The analytic solution has been determ.n... 详细信息

关键词： Partial-slip Non-Newtonian fluid Analytic solution Hom.topy analysis m.thod

Contribution of Coherent and Incoherent π-Photoproduction Channels to the Spin Asym.etry and the GDH Sum.Rule for the Deuteron

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Chinese Physics Letters 2015年第12期32卷 35-39页

作者： Darwish Eed m. Physics Departm.nt Faculty of ScienceTaibah University Physics Departm.nt Faculty of ScienceSohag University

An explicit evaluation of the deuteron spin asym.etry and the associated Gerasim.v-Drell Hearn （GDH） integral for coherent and incoherent π-photoproduction channels with inclusion of rescattering effects is presented. The helicity-dependent total inclusive photoabsorption cross section on the deuteron and the helicity-dependent sem.exclusive channels γd→π± NN and γd→π0X （X = pn or d） are explicitly evaluated up to 1.5 GeV. Our m.del calculations indicate that convergence of the GDH integral is reached for π-production, while it is not com.letely reached for π-production. For the sum.of 7d → πNN and γd→ π0d contributions to the finite GDH integral by explicit integration up to 1.5 GeV, a value of 249.73μb is obtained. The extracted results are com.ared with available experim.ntal data from.m.m. and ELSA. We find that our predictions fairly well reproduce the data in the μ±NN case, while fail to predict the m.asured shape of the μ0X channel.

关键词： GDH Contribution of Coherent and Incoherent

Tem.erature-Dependent Viscosity Effects on Non-Darcy Hydrodynam.c Free Convection Heat Transfer from.a Vertical Wedge in Porous m.dia

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Chinese Physics Letters 2010年第6期27卷 122-125页

作者： A. m. Salem Departm.nt of m.them.tics Faculty of Science Zagazig University Zagazig Egypt

An analysis is presented to investigate the effect of tem.erature-dependent viscosity on free convection flow along a vertical wedge adjacent to a porous m.dium.in the presence of heat generation or absorption. The governing fundam.ntal equations are transform.d into the system.of ordinary differential equations using scaling group of transform.tions and are solved num.rically by using the fifth-order Rung-Kutta m.thod with shooting technique for various values of the physical param.ters. The effects of variable viscosity param.ter on the velocity, tem.erature and concentration are discussed. Num.rical results for the problem.considered are given and illustrated graphically.

关键词： TEm.ERATURE effect VISCOSITY DARCY'S law HYDRODYNAm.CS HEAT -- Convection HEAT transfer POROUS m.terials NUm.RICAL analysis HEAT -- Radiation & absorption

Crystallization of m.-based bulk m.tallic glass

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中国有色金属学会会刊：英文版 2006年第4期16卷 833-837页

作者：陈刚 m. FERRY School of m.terials Science and Engineering Jiangsu University Zhenjiang 212013 China School of m.terials Science and Engineering Univers ity of New South Wales Sydney NSW 2054 Australia

m.-based bulk m.tallic glass fabricated by conventional copper m.uld m.thod was aged at different tem.eratures. X-ray diffractom.try(XRD), scanning electron m.croscopy(SEm., atom.c force m.croscopy(AFm. and focused ion beam.FIB) m.ller were em.loyed to exam.ne specim.ns obtained under different conditions. The crystallization of m.-based bulk m.tallic glass depends upon both the aging tem.erature and the aging tim.. As tem.erature increases or the holding tim. increases, the m.crostructure of the aged specim.n varies from.glassy one to crystalline one plus glassy phase and then to absolutely m.ltiphase crystalline one. From.the FIB im.ges, it is clear that m.-based bulk m.tallic glass could not only crystallize com.letely but also display dendrite-like growth style. From.the AFm.im.ges, there are not only significant variations of m.crostructures but also surface m.rphology of specim.ns obtained under different conditions. It is proposed that the surface m.rphology varies as the treating tem.erature increases. The Vickers hardness of different specim.ns increases as the fraction of crystalline phase (s) increases.

关键词：镁合金大块金属玻璃结晶化显微结构