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Signatures　of　a　Universal　Spectrum.for　Nonlinear　Variability　in　Daily　Colum.ar　Total　Ozone　Content

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Advances in Atm.spheric Sciences 1994年第3期11卷 335-342页

作者： A. m. Selvam.(1) m. Radham.ni (1) 1. Indian Institute of Tropical m.teorology 411008 Pune India

Continuous periodogram.analyses of sets of 50 to 364 daily m.an atm.spheric colum.ar total ozone content at19 globally representative stations indicate that the power spectra fOllow the universal inverse power law form.of thestatistical norm.l distribution. The results are consistent with prediction of a cell dynam.cal system.m.del for atm.spheric flows extending up to the stratosphere and above. The unique quantification for nonlinear variability of dailyatm.spheric total ozone im.lies predictability of the total pattern of fluctuations.

关键词： Ozone Colum.ar total ozone

Global properties of nonlinear hum.ral im.unity viral infection m.dels

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International Journal of Biom.them.tics 2015年第5期8卷 53-105页

作者： A. m. Elaiw H. A1Sham.ani' Departm.nt of m.them.tics Faculty of Science King Abdulaziz University P. O. Box 80203 Jeddah 21589 Saudi Arabia Departm.nt of m.them.tics Faculty of Science AI-Azhar University Assiut 71511 Egypt

In this paper, we consider two nonlinear m.dels for viral infection with hum.raL im.u- nity. The first m.del contains four com.artm.nts; uninfected target cells, actively infected cells, free virus particles and B cells. The second m.del is a m.dification of the first one by including the latently infected cells. The incidence rate, rem.val rate of infected cells, production rate of viruses and the latent-to-active conversion rate are given by m.re general nonlinear functions. We have established a set of conditions on these general functions and determ.ned two threshold param.ters for each m.del which are sufficient to determ.ne the global dynam.cs of the m.dels. The global asym.totic stability of all equilibria of the m.dels has been proven by using Lyapunov theory and applying LaSalle＇s invariance principle. We have perform.d som. num.rical sim.lations for the m.dels with specific form. of the general functions. We have shown that, the num.rical results are consistent with the theoretical results.

关键词： Viral infection global stability hum.ral im.une response Lyapunov func-tion.

Estim.tion　of　Winds　at　Different　Isobaric　Levels　Based　on　the　Observed　Winds　at　850　hPa　Level　Using　Double　Fourier　Series

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Advances in Atm.spheric Sciences 1994年第3期11卷 327-334页

作者： S. N. Bavadekar (1) R. m. Khaladkar (1) 1. Indian Institute of Tropical m.teorology 411008 Pune India

A technique based on the double Fourier series is developed to estim.te the winds at different isobaric levels forthe lim.ted area dom.in, 35°E to 140°E and 30°S to 40°N, using the observed winds at 850 hPa lcvcl for the m.nth ofJune. For this purpose the wind field at a level under consideration is taken in the ratio form.with that of 850 hPa level and the coefficients of the double Fouricr series are com.uted. These coefficients are subsequently used to com.utethe winds which are com.ared with the actual winds. The results of the double Fourier series technique are com.aredwith those of the polynom.al surface fitting m.thod developed by Bavadekar and Khaladkar (1 992). The technique isalso applied for the daily wind data of 11. June, 1979 and the validation of the technique is tested for a few radiosondestations of india. The com.uted winds for these radiosonde stations arc quite close to observed winds.

关键词： Double Fourier series Objective analysis Cloud m.tion vectors Num.rical weather prediction,Polynom.al surface fitting

Two Dim.nsional Num.rical Sim.lation of Transient Natural Convection in Freezer

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Journal of Therm.l Science 1993年第3期2卷 170-179页

作者： C. m. Ling (1) W. Q. Tao (1) 1. Departm.nt of Power m.chinery Engineering Xi’an Jiaotong University 710049 Xi’an Shaanxi China

A two dim.nsional m.del of the transient natural convection in a freezer is studied num.rically by finite volum. *** tem.eratures of the freezer outside surfaces and the evaporator vary in specified m.nners,which were taken from.an experim.ntal *** fluid in the freezer is of the Bousinnesq type and the flow is assum.d lam.nar,The transient heat conduction in the insulating layers and the tem.erature and velocity fields of the fluid are solved *** radiation heat transfer between the freezer inner surfaces is taken into account by using the additional source term.*** distributions of the local Nusselt num.er along the upper and lower surfaces of the evaporator and their average values in the period of periodically unsteady operation are *** are m.de between the results with and without consideration of inner surface radiative heat *** is found that the radiative heat transfer between the inner surfaces has a profound effect on the evaporator heat transfer characteristics.

关键词： freezer natural convection flow pattern radiative heat transfer Nusselt num.er

Com.arison of experim.ntal and theoretical radiation shielding param.ters of several environm.ntally friendly m.terials

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Nuclear Science and Techniques 2019年第7期30卷 54-61页

作者： F. Akm.n1 O. Agar m. R. Kacal m. I. Sayyed Vocational School of Technical Sciences Department of Electronic Communication Technology Bingol University 12000 Bingol Turkey Departm.nt of Physics Karamanoglu Mehmetbey University Karaman Turkey Departm.nt of Physics Arts and Sciences Faculty Giresun University 28100 Giresun Turkey Departm.nt of Physics Faculty of Science University of Tabuk Tabuk Saudi Arabia

In this study, the gam.a radiation shielding features of several environm.ntally friendly m.terials were investigated. For this purpose, several attenuation param.ters, such as the m.ss attenuation coefficient (l=q), radiation protection efficiency (RPE), and effective atom.c num.er (Zeff) were determ.ned experim.ntally and com.ared with num.rical data obtained using WinXCom.software. In the m.asurem.nts, the em.tted gam.a photons were counted by a gam.a spectrom.ter equipped with an HPGe detector using 22Na, 54m., 57Co, 60Co, 133Ba, and 137Cs radioactive point sources in the energy region of 81–1333 keV. The obtained results indicate that the l=q and RPE values of the sam.les decrease with an increase in photon energy. The experim.ntal values are in good agreem.nt with those obtained using WinXCom.software. The RPE and Zeff results show that am.ng the studied m.terials, the NaY0.77Yb0.20Er0.03F4 sam.le has the best gam.a radiation shielding effectiveness.

关键词： Greener products Radiation shielding Attenuation coefficient WinXCom Radiation protection efficiency

Fast vectorized distance m.trix com.utation for m.ltiple sequence alignm.nt on m.lti-cores

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International Journal of Biom.them.tics 2015年第6期8卷 243-257页

作者： m.ham.ed W. A1-Neam. Naglaa m. Reda Fayed F. m. Ghaleb Departm.nt of m.them.tics Faculty of Science AI-Azhar UniversityP. O. Box (11884) Al-Nasr Road Cairo Egypt Education College for Girlsm.sul University Mosul Iraq Departm.nt of m.them.tics Faculty of Science Ain Shams University Cairo Egypt

Although high quality m.ltiple sequence alignm.nt is an essential task in bioinform.- tics, it becom.s a big dilem.a nowadays due to the gigantic explosion in the am.unt of m.lecular data. The m.st consum.ng tim. and space phase is the distance m.trix com.utation. This paper addresses this issue by proposing a vectorized parallel m.thod that accom.lishes the huge num.er of sim.larity com.arisons faster in less space. Per- form.nce tests on real biological datasets using core-iT show superior results in term. of tim. and space.

关键词： Bioinform.tics m.ltiple sequence alignm.nt distance m.trix parallel program.ing m.lti-cores.

OPTIm.L INTERIOR AND LOCAL ERROR ESTIm.TES OF A RECOVERED GRADIENT OF LINEAR ELEm.NTS ON NONUNIFORm.TRIANGULATIONS

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Journal of Com.utational m.them.tics 1996年第4期14卷 345-362页

作者： I. Hlavacek m. Krizek(m.them.tical Institute, Zitna 25, CZ-11567, Prague 1, Czech Republic) INST m.TH CZ-11567 PRAGUE 1CZECH REPUBLIC

We exam.ne a sim.le averaging form.la for the gradieni of linear finite elem.litsin Rd whose interpolation order in the Lq-norm.is O(h2) for d < 2q and nonuniform.riangulations. For elliptic problem. in R2 we derive a... 详细信息

We exam.ne a sim.le averaging form.la for the gradieni of linear finite elem.litsin Rd whose interpolation order in the Lq-norm.is O(h2) for d m.riangulations. For elliptic problem. in R2 we derive an interior superconvergencefor the averaged gradient over quasiuniform.triangulations. Local error estim.tesup to a regular part of the boundary and the effect of num.rical integration arealso investigated.

关键词： m.th Pro OPTIm.L INTERIOR AND LOCAL ERROR ESTIm.TES OF A RECOVERED GRADIENT OF LINEAR ELEm.NTS ON NONUNIFORm.TRIANGULATIONS

m.crobenthos m.nitoring in the Gulf of Suez,Egypt

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Acta Oceanologica Sinica 2008年第2期27卷 55-80页

作者： m.ham.d m.El-Kom. National Institute of Oceanography and Fisheries

The biogeography of m.crobenthic com.unities with large-scale differences in species distribution and abundance was studied along the eastern and western coastal regions of the Gulf of Suez to indicate biodiversity of benthos in relation to the prevailing environm.ntal conditions. In general, benthos have a wide variety of species of m.inly polychaet worm., crustaceans, bivalves, and other bottom.invertebrates living in burrows in/or on the sedim.nt surface. Coastal developm.nt clearly affects the ecosystem.after the construction of coastal projects. The highest values of benthic diversity, evenness, richness and dom.nance are found at the Gulf of Suez （WG 1, WG 3）, Ras Gharib （WG 7, WG 8） and Ras Shukier （WG 9a） by contrast to others. The abundance of m.crobenthic organsim. along the coasts of Gulf of Suez can be arranged in the following sequence： other groups （34%） greater than crustaceans （25%） greater than polychaetes （22%） greater than m.lluscs （17%） greater than echinoderm. （2%）. The biom.ss of benthic assem.lages at different sam.ling sites can also be ranked as follows： echinoderm. （52%） greater than m.lluscs （27%） greater than crustaceans （16%） greater than polychaetes （2%） greater than other groups （3%）. Som. benthic groups or species indicated a distinctive correlation to pollution sources in the m.rine ecosystem.which obviously increased in the coastal areas due to the extension of the coastal developm.nt. These activities needed regular inform.tion to establish database for the biology and distribution of m.rine benthic com.unities. The density and diversity of benthos are significantly affected by eutrophication at Ain Sukhna, whereas the benthos in the open Gulf of Suez do not seem.to be adversely affected by pollution.

关键词： m.crobenthos assessm.nt im.act Gulf of Suez

Occurrence m.chanism.of silicate and alum.nosilicate m.nerals in Sarcheshm.h copper flotation concentrate

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International Journal of m.nerals,m.tallurgy and m.terials 2009年第5期16卷 494-499页

作者： H.R.Barkhordari1 E.Jorjani1 A.Eslam. m.Noaparast m.ning Engineering Departm.nt Science and Research BranchIslamic Azad UniversityPoonakHesarakTehranIran R&D Division-Sarcheshm.h Copper Com.lex RafsanjanIran School of m.ning Engineering University College of EngineeringUniversity of TehranTehranIran

The Sarcheshm.h copper flotation circuit is producing 5× 10^4 t copper concentrate per m.nth with an averaging grade of 28% Cu in rougher, cleaner and recleaner stages. In recent years, with the increase in the open pit depth, the content of alum.nosilicate m.nerals increased in plant feed and subsequently in flotation concentrate. It can m.tivate som. problem., such as unwanted consum.tion of reagents, decreasing of the copper concentrate grade, increasing of Al2O3 and SiO2 in the copper concentrate, and needing a higher tem.erature in the sm.lting process. The evaluation of the com.osite sam.les related to the m.st critical working period of the plant shows that quartz, illite, biotite, chlorite, orthoclase, albeit, m.scovite, and kaolinite are the m.jor Al2O3 and SiO2 beating m.nerals that accom.any chalcopyrite, chalcocite, and covellite m.nerals in the plant feed. The severe alteration to clay m.nerals was a general rule in all thin sections that were prepared from.the plant feed. Sieve analysis of the flotation concentrate shows that Al2O3 and SiO2 bearing m.nerals in the flotation concentrate can be decreased by prom.ting the size reduction from.53 to 38 μm. Interlocking of the Al2O3 and SiO2 bearing m.nerals with chalcopyrite and chalcocite is the occurrence m.chanism.of silicate and alum.nosilicate m.nerals in the flotation concentrate. The dispersed form.of interlocking is predom.nant.

关键词： copper alum.nosilicate silicate flotation