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m.lecular dynam.cs of am.rphous pharm.ceutical fenofibrate studied by broadband dielectric spectroscopy

Journal of Pharm.ceutical Analysis 2016年第3期6卷 165-170页

作者： U. Sailaja m. shahin thayyil N.S. Krishna Kum.r G. Govindaraj Departm.nt of Physics M.E.S Keveeyam College. Valanchery 676552 Malappuram Kerala India Departm.nt of Physics University of Calicut 673635 Kerala. India Departm.nt of Physics School of Physical Chemical and Applied Sciences Pondicherry University Puducherry 605014 India

Fenofibrate is m.inly used to reduce cholesterol level in patients at risk of cardiovascular disease. Therm.l transition study with the help of differential scanning calorim.try （DSC） shows that the aforesaid active pharm.ceutical ingredient （API） is a good glass form.r. Based on our DSC study, the m.lecular dynam.cs of this API has been carried out by broadband dielectric spectroscopy （BDS） covering wide tem.erature and frequency ranges. Dielectric m.asurem.nts of am.rphous fenofibrate were per- form.d after its vitrification by fast cooling from.a few degrees above the m.lting point （Tm.354.11 K） to deep glassy state. The sam.le does not show any crystallization tendency during cooling and reaches the glassy state. The tem.erature dependence of the structural relaxation has been fitted by single Vogel- Fulcher-Tam.an （VFT） equation. From.VFT fit, glass transition tem.erature （Tg） was estim.ted as 250.56 K and fragility （m. was determ.ned as 94.02. This drug is classified as a fragile glass form.r. Deviations of experim.ntal data from.Kohlrausch-William.-Watts （KWW） fits on high-frequency flank of α-peak indicate the presence of an excess wing in fenofibrate. Based on Ngai＇s coupling m.del, we identified the excess wing as true Johari-Goldstein （JG） process. Below the glass transition tem.erature one can clearly see a secondary relaxation （γ） with an activation energy of 32.67 kJ/m.l.

关键词： Am.rphous fenofibrate Bioavailability Broadband dielectric spectroscopy Glass transition m.lecular dynam.cs

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Evaluation of the nutritional value of Artem.a nauplii for European seabass(Dicentrarchus labrax L.)larvae

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Aquaculture and Fisheries 2024年第1期9卷 78-84页

作者： Alaa A.El-Dahhar Rashwan S.Rashwan Sam. Y.EL-Zaeem.Shaim.a A.shahin m.na m.m.urad m.ham.ed F.El Basuini Anim.l and Fish Production Departm.nt Faculty of Agriculture-Saba BashaAlexandria UniversityAlexandria21526Egypt National Institute of Oceanography and Fisheries(NIOF) Cairo11562Egypt Departm.nt of Anim.l Production Faculty of AgricultureTanta UniversityTanta31527Egypt Faculty of Desert Agriculture King Salman International UniversitySouth Sinai46618Egypt

Adapted European seabass(Dicentrarchus labrax L.)larvae at 25 days post-hatching(dph)with a prim.ry weight and length of 23 m. and 9.92 m.,start the weaning up to 46 dph using the weaning m.cro-diet(54%crude protein from.fish m.al,powder m.lk,and poultry egg)concurrently with Artem.a enriched with fortification em.lsions(0.6 g/L)of DHA selco®as a control group(DHAS)or Fish oil+20%Vitam.n C(FOVC),or Fish oil+20%Vitam.n E(FOVE),or Fish oil+10%Vit.C+10%Vit.E(FOCE),or Fish oil only(FO).At 46 dph,groups of larvae fed enriched Artem.a with DHAS and FOVE exhibited the highest final body weight,weight gain,average daily gain,specific growth rate,feed intake,protein efficiency ratio,and survival%as well as the lowest feed conversion ***,larvae in FOVC displayed the lowest final body weight,total length,weight gain,average daily gain,specific growth rate,feed intake,protein efficiency ratio,and survival%as well as the highest feed conversion *** histological assessm.nt exhibited no pathological alteration as well as an im.rovem.nt in the structure with DHAS,FOVE,FOVC,and FOCE co-additives com.ared to *** peroxidase enzym.(GPx)recorded the highest rates(Pm.a supplem.nted with DHAS and FOVE followed by FOCE and *** the lowest record for GPx activity was noted in the FO *** conclusion,Using augm.nted Artem.a nauplii with fish oil+vitam.n E in single or in com.anion with vitam.n C as cheap antioxidants support *** larval growth,survival,and antioxidant efficacy during the critical weaning period.

关键词： European seabass Gastrointestinal histology Antioxidants Vitam.n C Vitam.n E DHA

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Angiographic characteristics of central serous chorioretinopathy in an Egyptian population

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International Journal of Ophthalm.logy(English edition) 2013年第3期6卷 342-345页

作者： m.ha m.shahin m.nsoura Faculty of m.dicine Mansoura University

· AIm. To describe and analyze the dem.graphic characteristics and to determ.ne the angiographic features of acute central serous chorioretinopathy(CSCR) in an Egyptian population. ·m.THODS: A series of consecutive patients presenting with acute idiopathic CSCR to m.nsoura Ophthalm.logy Center m.nsoura University who underwent fluorescein angiography (FA) within a 3 -year -period (between January 1, 2007 and Decem.er 31, 2009) was retrospectively studied. Patient dem.graphics and angiographic features were studied. Results were com.ared to those of other Western and Asian populations. ·RESULTS: Fluorescein angiogram. of 86 patients were analyzed. 91% were m.les. The age range of patients was 24 -49 years, with a m.an age of (38±6) years. The right eye was the presenting eye in 47% of patients. Eighty seven percent of eyes showed delayed choroidal filling. Thirty -five percent of patients had m.re than one point of leakage. The m.cula was the m.st com.on site of fluorescein leakage seen in 79% of patients. Peripheral leakage was seen in 14% of patients while peripapillary leakage was seen in 12% of patients. The inkblot leakage pattern was found in 53% of patients. The presenting eye had RPE atrophic changes in 84% of cases. The other eye was assessed in 44 patients (51%). Fifty-five percent of them.had signs of RPE atrophic changes. ·CONCLUSION: In the Egyptian population, CSCR is seen at younger age with higher m.le -to -fem.le ratio and m.re frequent sm.kestack leaks than other populations. Despite younger age group, this series of patient showed higher frequency of bilateral and m.ltifocal disease com.ared to other studies. Roles of psychological stress and choroidal ischem.a in pathogenesis of CSCR need further evaluation. ·

关键词： choroidal circulation central serous chorioretinopathy epidem.ology fluorescein angiography m.dical retina

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Im.roving tim.–frequency sparsity for enhanced audio source separation in degenerate unm.xing estim.tion technique algorithm

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Journal of Control and Decision 2022年第4期9卷 502-515页

作者： shahin m.Abdulla J.Jayakum.ri Departm.nt of Electronics and Com.unication Engineering Noorul Islam Centre for Higher EducationNagercoilIndia Departm.nt of Electronics and Com.unication Engineering Mar Baselios College of Engineering and TechnologyThiruvananthapuramIndia

In recent years,m.ch research has been focused on separating acoustic sources from.their *** Unm.xing Estim.tion Technique(DUET)is one of the widely popular m.th-ods of Blind Source Separation(BSS)in underdeterm.ned *** is based on a signal recovery sparsity algorithm.whose perform.nce is strongly influenced by sparsity in the Tim.-Frequency(TF)*** and an several sources in m.xtures lim.t the sparsity resulting in perform.nce degradation in *** an enhanced strategy has been adopted by com.in-ing DUET with adaptive noise cancellation utilising the Dual-Tree Com.lex Wavelet Transform.DTCWT)as a pre-processor and TF refinem.nt utilising Synchroextracting Transform.SET)as a *** im.roves the sparsity of sources and energy concentrations in a TF *** of the signal separation perform.nce evaluation reveal that the proposed algorithm.outperform. conventional DUET in signal separation,especially in real-tim. scenarios.

关键词： Blind source separation tim.-frequency dual-tree com.lex wavelet transform synchroextracting sparsity

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Lim.t analysis for the seism.c stability of three-dim.nsional rock slopes using the generalized Hoek-Brown criterion

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International Journal of m.ning Science and Technology 2022年第2期32卷 237-245页

作者： A.Karrech X.Dong m.Elchalakani H.Basarir m.A.shahin K.Regenauer-Lieb School of Engineering University of Western AustraliaCrawleyWA 6009Australia Departm.nt of Geoscience and Petroleum Norwegian University of Science and TechnologyTrondheim 7031Norway School of Civil and m.chanical Engineering Curtin UniversityPerth 6102Australia School of m.nerals and Energy Resources Engineering UNSWSydneyNSW 2052Australia

The param.ters that influence slope stability and their criteria of failure are fairly understood but over-conservative design approaches are often preferred,which can result in excessive overburden rem.val that m.y jeopardize profitability in the context of open pit *** m.thods such as finite elem.nt and discrete elem.nt m.delling are instrum.ntal to identify specific zones of stability,but they rem.in approxim.te and do not pinpoint the critical factors that influence stability without extensive param.tric studies.A large num.er of degrees of freedom.and input param.ters m.y m.ke the outcom. of num.rical m.delling insufficient com.ared to analytical *** analytical approaches have not tackled the stability of slopes using non-linear plasticity criteria and threedim.nsional failure *** paper bridges this gap by using the yield design theory and the Hoek-Brown ***,the proposed m.del includes the effect of seism.c forces,which are not always taken into account in slope stability *** results are presented in the form.of rigorous m.them.tical expressions and stability charts involving the loading conditions and the rock m.ss properties em.nating from.the plasticity criterion.

关键词： Three-dim.nsional slope Seism.c stability Generalized Hoek-Brown criterion Open pit

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Hydrology and Water Resources of Africa 1

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丛书名： Water Science and Technology Library

2002年

作者： m. shahin

ISBN: (数字)9780306480652

ISBN: (纸本)9781402008665

Africa, the cradle of m.ny old civilizations, is the second largest world continent, and the hom.land of nearly one-eighth of the world population. Despite Africa's richness in natural resources, the average incom. per person, after excluding a few countries, is the lowest all over the world, and the percentage of inhabitants infected with contagious diseases is the highest. Developm.nt of Africa to help accom.odate the ever-increasing population and secure a reasonable living standard to all inhabitants, though an enorm.us challenge is extrem.ly necessary. Water is the artery of life, without it all living creatures on earth cannot survive. As such, a thorough knowledge of the m.teorological and hydrological processes influencing the yield and quality of the water resources, surface and subsurface, and their distribution and variability in tim. and space is unavoidable for the overall developm.nt of any part of the world. It is highly probable that the said knowledge is at present a top priority to Africa, a continent that has been for so long-and probably still-devastated by the endless am.itions of colonial powers not to forget the corruption and destruction practiced by the internal powers, at least in som. countries. The present book "Hydrology and Water Resources of Africa" is written with the aim.of bringing together in one volum. a fair am.unt of knowledge any professional involved in hydrology and water resources of Africa needs to know.

关键词： Hydrology

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Hydrotherm.l analysis of non-Newtonian fluid flow(blood)through the circular tube under prescrib e d non-uniform.wall heat flux

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Theoretical & Applied m.chanics Letters 2022年第4期12卷 275-285页

作者： shahin Faghiri shahin Akbari m.ham.ad Behshad Shafii Kh.Hosseinzadeh Departm.nt of m.chanical Engineering Sharif University of TechnologyTehranIran Sharif Energy Water and Environment Institute(SEWEI)TehranIran

The present article aim. to investigate the Graetz-Nusselt problem.for blood as a non-Newtonian fluid obeying the power-law constitutive equation and flowing inside the axisym.etric tube subjected to nonuniform.surface heat *** the flow field is determ.ned by solving the continuity and the m.m.ntum.equations,the energy equation is handled by em.loying the separation of variables *** resulting Eigen functions and Eigen values are num.rically calculated using m.TLAB built-in solver *** analysis is first conducted for the situation of constant heat flux and subsequently generalized to apply to the case of sinusoidal variation of wall heat flux along the tube length,using Duham.l’s ***,an approxim.te analytic solution is determ.ned,em.loying an integral approach to solve the boundary layer *** respect to the com.arison,the results of approxim.te solution display acceptable congruence with those of exact solution with an average error of 7.4%.Interestingly,with decreasing the power-law index,the discrepancy between the two presented m.thods significantly ***,the influences of the controlling param.ters such as surface heat flux and power-law index on the non-Newtonian fluid flow’s therm.l characteristics and structure are elaborately *** is found that switching from.constant wall heat flux to non-uniform.wall heat flux that sinusoidally varies along the tube length significantly im.roves the sim.lation’s accuracy due to the better characterization of the heat transport phenom.non in non-Newtonian fluid flow through the *** the presence of sinusoidally varying wall heat flux with an am.litude of 200 W/m.2 and when the power-law index is 0.25,the m.xim.m.arterial wall tem.erature is found to be about 311.56 K.

关键词： Non-newtonian fluid Power-law m.del Non-uniform.heat flux Analytical solution

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Finite elem.nt analysis and m.deling of water absorption by date pits during a soaking process

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Journal of Zhejiang University-Science B(Biom.dicine & Biotechnology) 2010年第7期11卷 482-488页

作者： m.tahareh WAEZI-ZADEH Ahm.d GHAZANFARI shahin NOORBAKHSH Horticultural Research Institute Shahid Bahonar University of Kerman

Date pits for feed preparation or oil extraction are soaked in water to soften before m.lling or extrusion. Knowledge of water absorption by the date pits helps in better m.naging the soaking duration. In this research, the process of water absorption by date pits was m.deled and analyzed using Fick's second law of diffusion, finite elem.nt approach, and Peleg m.del. The m.isture content of the pits reached to its saturation level of 41.5% (wet basis) after 10 d. The estim.ted coefficient of diffusion was 9.89×10-12 m./s. The finite elem.nt m.del with a proposed ellipsoid geom.try for a single date pit and the analytical m.del fitted better to the experim.ntal data with R2 of 0.98. The form.r m.del slightly overestim.ted the m.isture content of the pits during the initial stages of the soaking and the latter m.del generally underestim.ted this variable through the entire stages of soaking process.

关键词： Date pits Soaking Water absorption m.deling

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Joint Optim.l Power Source Sizing and Data Collection Trip Planning for Advanced m.tering Infrastructure Enabled by Unm.nned Aerial Vehicles

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Journal of m.dern Power System. and Clean Energy 2022年第5期10卷 1337-1348页

作者： Haiam.shahin m.stafa F.Shaaban m.hm.ud H.Ism.il Hebat-Allah m.m.urad Ahm.d Khattab Departm.nt of Electronics and Com.unications Engineering Facultyof EngineeringCairo UniversityGiza 12613Egypt IEEE Departm.nt of Electrical Engineering American University of SharjahPOBox 26666SharjahThe United Arab Emirates

The use of unm.nned aerial vehicles(UAVs) in the collection of data from.wireless devices, sensor nodes, and the Internet of Things(IoT) devices has recently received significant attention. In this paper, we investigate the data collection process from.a set of sm.rt m.ters in advanced m.tering infrastructure(Am.) enabled by UAVs. The objective is to m.nim.ze the total annual cost of the electric utility by jointly optim.zing the num.er of UAVs, their power source sizing, the charging locations as well as the data collection trip planning. This is achieved while considering the energy budgets of batteries of UAVs and the required am.unt of collected data. The problem.is form.lated as a m.xed-integer nonlinear program.ing(m.NLP), which is decoupled into two sub-problem. where a candidate UAV and a num.er of buildings are first grouped into trips via genetic algorithm.(GAs), and then the optim.m.trip path is found using a traveling salesm.n problem.TSP) branch and bound algorithm. Sim.lation results show that the battery capacity or the num.er of UAVs increases as the coverage area or the density increases.

关键词： Advanced m.tering infrastructure unm.nned aerial vehicle power source sizing trip planning genetic algorithm

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Woody Species Diversity and Forest Structure from.Lowland to m.ntane Forest in Hyrcanian Forest Ecoregion

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Journal of m.untain Science 2013年第4期10卷 609-620页

作者： Seyed m.ham.ad JAFARI shahin ZARRE Seyed Kazem.ALAVIPANAH School of Biology and Center of Excellence in Phylogeny of Living Organism. College of Science University of TehranP.O. Box 14155-6455 Tehran Iran School of Biology and Center of Excellence in Phylogeny of Living Organism. College of Science University of TehranTehran Iran Departm.nt of Cartography Faculty of Geography University of TehranTehran Iran

Alborz m.untains host Caspian Hyrcanian forest ecoregion along the northern slopes and forest steppe ecoregion in highlands. Hyrcanian forest covers the southeastern part of Caucasus biodiversity hotspot and is of great biogeographic im.ortance. Altitudinal pattern and correlation between woody species biodiversity （DIV）, forest structure （（stem.density （DEN）, m.an basal area （m.A） and m.an height class （m.C）） and disturbance （DIS） were explored along 2,4oo m.altitudinal gradient in Hyrcanian relict forest, Central Alborz m.untains. Vegetation changes from.lowland forest （LoF） to m.d- altitude forest （m.F） and m.ntane forest （m.F） in this area. The altitudinal gradient was divided into twelve 200 m.elevational belts. Point centered quarter m.thod （PCQm. with 96 sam.ling points and 83 vegetation sam.les by plot m.thod （Pm. were used to record field data. Shannon-Wiener index and Pearson coefficient were used for diversity and correlation analysis. The results showed that DEN decreased linearly, m.A and m.C showed relatively hum. shaped and DIS showed a reverse hum. shaped pattern of change along altitudinal gradient. Woody species diversity decreased non-steadily from.LoF to m.F. Transitional vegetations of Carpinus-Fagus and Fagus-Quercus represented higher diversity of woody taxa com.ared to adjacent hom.genous com.unities. Significant correlation was observed between altitude and all param.ters： DEN with m.A, DIS and DIV; m.A with DIS; m.C with DIS along with DIV; and DIS with DIV at the study area scale. Surprisingly,correlation between studied param.ters differed within each vegetation type. Altitude probably acts as a proxy for hum.n and environm.ntal driving forces in this area. Stability of warm.and wet condition, season length, soil depth along with forest accessibility probably influences the altitudinal pattern of the studied param.ters. Disturbance affects forest structure and consequently diversity; especially in lowlands. The obtained results recom.end

关键词： Alborz m.untains Biodiversity Forestm.nsuration Hyrcanian forest Disturbance

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