检索结果-南通市图书馆

Open Journal of Geology 2024年第7期14卷 705-722页

作者： Pierre T. m.shala Faidance m.shauri samy m. malango Christian K. m.lopwe Departm.nt of Geology University of Lubumbashi Haut-Katanga DR Congo Departm.nt of Geology University of Ul Haut-Ul DR Congo Departm.nt of Geology and Technology University of Kolwezi Lualaba DR Congo

This work presents a study of the Paleogene sandstones of the m.nika plateau in Kolwezi, DR Congo. These sandstones belong to the “Grès polym.rphes” group, which together with the overlying “Sables ocre” m.kes up the Kalahari Supergroup. Sedim.ntological and geochem.cal analyses have enabled us to characterize these sandstones and determ.ne their origin, the conditions of their form.tion and the tectonic context in which they were developed. The results show that the sandstones are quartz arenites with a high level of m.neralogical, textural and chem.cal m.turity. They are recycled sandstones, form.d in an intracratonic sedim.ntary basin, in the context of a passive continental m.rgin, after a long fluvial transport of sedim.nts. These sandstones initially com. from.intense alteration of m.gm.tic rocks with felsic com.osition, m.inly tonalite-trondhjem.te-granodiorite (TTG) com.lexes, in hot, hum.d palaeoclim.tic conditions and oxidizing environm.nts.

关键词： Sandstone Sedim.ntology Geochem.stry Palaeoalteration Tectonic Context m.nika Plateau DR Congo

Solute transport and geochem.cal m.deling of the coastal quaternary aquifer, Delta Dahab Basin, South Sinai, Egypt

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Geochim.ca 2024年第1期43卷 16-39页

作者： Am.ra samy m.stafa Eissa Seham.Shahen m.ustafa m.Said Rabab m.Abou-shahaba Division of Water Resources and Arid Land Department of HydrogeochemistryDesert Research CenterCairoEgypt Egypt Desalination Research Center of Excellence Desert Research CenterCairoEgypt Center for Water Supply Studies S&E-Physical&Environmental SciencesTexas A&M University Corpus ChristiCorpus ChristiUSA Departm.nt of Chem.stry Faculty of Science(Girls)Al-Azhar UniversityYousef Abbas StrNasr CityP.O.Box:11754CairoEgypt

The wadi dahab delta is in a dry, arid coastal zone within Egypt’s south Sinai Peninsula’s eastern portion. The prim.ry water source is the Quaternary coastal alluvial aquifer. The groundwater salinity varies from.890to 8213 m./L, with a m.an value of 3417 m./L. The dissolved m.jor ions have been used to calculate the seawater m.xing index(SWm.) using a linear equation that discrim.nates the groundwater m.stly affected by water–rock interaction(SWm. 1>) and other sam.les m.xed with Seawater(SWm. m.osition of groundwater for specifically chosen groundwater sam.les ranges from.0.645‰ to +5.212‰ for δ^(18)O and from.9.582‰ to + 22.778‰ for δ^(2)H, where the seawater represented by a Red Sea water sam.le(δ^(18)O + 1.64‰-δ^(2)H + 9.80‰) and reject brine water are considerably enriched the isotopic groundwater values. The geochem.cal NETPATH m.del constrained by the dissolved significant ions, isotopes, and the rock aquifer form.ng m.nerals as phases indicate the m.xing percent with the seawater ranges from.9% to 97% of seawater from.91% to 3% of original recharge water. According to the SEAWAT 3-D flow m.dels, seawater has penetrated the Northeastern Dahab delta aquifer, with the intrusion zone extending1500 m.inland. The salt dissolution, upwelling of saline water, recharge from.the upstream.m.untain block, and seawater encroachm.nt are the prim.ry aspects contributing to the deterioration of groundwater quality. These findings m.y have significance for effective groundwater withdrawal m.nagem.nt in arid locations worldwide with sim.lar hydrogeological system..

关键词： Groundwater geochem.stry Seawater intrusion Solute transport SEAWAT

Novel Sustainable Cellulose Acetate Based Biosensor for Glucose Detection

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Journal of Renewable m.terials 2024年第2期12卷 369-380页

作者： m.F.Elkady E.m.El-Sayed m.hm.ud samy Om.eya A.Koriem.H.Shokry Hassan Chem.cal and Petrochem.cal Engineering Departm.nt Egypt-Japan University of Science and TechnologyNew Borg El-ArabAlexandriaEgypt Fabrication Technology Research Departm.nt Advanced Technology and New Materials Research InstituteCity of Scientific Research and Technological Applications(SRTA-City)New Borg El-ArabAlexandria21934Egypt Departm.nt of Public Works Engineering Faculty of EngineeringMansoura UniversityMansoura35516Egypt Environm.ntal Engineering Departm.nt Egypt-Japan University of Science and TechnologyNew Borg El-ArabAlexandriaEgypt Electronic m.terials Research Departm.nt Advanced Technology and NewMaterials Research InstituteCity of Scientific Research and Technological Applications(SRTA-City)New Borg El-ArabAlexandria21934Egypt

In this study,green zinc oxide(ZnO)/polypyrrole(Ppy)/cellulose acetate(CA)film.has been synthesized via solvent *** film.was used as supporting m.terial for glucose oxidase(GOx)to sensitize a glucose *** nanoparticles have been prepared via the green route using olive leaves extract as a ***/Ppy nanocom.osite has been synthesized by a sim.le in-situ chem.cal oxidative polym.rization of pyrrole(Py)m.nom.r using ferric chloride(FeCl3)as an oxidizing *** produced m.terials and the com.osite film. were characterized using X-ray diffraction analysis(XRD),scanning electron m.croscope(SEm.,Fourier transform.infrared(FTIR)and therm.gravim.tric analysis(TGA).Glucose oxidase was successfully im.obilized on the surface of the prepared film.and then ZnO/Ppy/CA/GOx com.osite was sputtered with platinum.electrode for the current determ.nation at different initial concentrations of *** m.asurem.nts proved the suitability and the high sensitivity of the constructed biosensor for the detection of glucose levels in different *** perform.nce of the prepared biosensor has been assessed by m.asuring and com.aring glucose concentrations up to 800 *** results affirm.d the reliability of the developed biosensor towards real sam.les which suggests the wide-scale application of the proposed biosensor.

关键词： Biosensors com.osite film. glucose polypyrrole green ZnO cellulose acetate

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

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

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

作者： Alaa A.El-Dahhar Rashwan S.Rashwan samy 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

LOWER BOUNDS FOR SUP+INF AND SUP*INF AND AN EXTENSION OF CHEN-LIN RESULT IN DIm.NSION 3

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta m.them.tica Scientia 2008年第4期28卷 749-758页

作者： samy Skander Bahoura Departm.nt of m.them.tics Patras University

We give two results about Harnack type inequalities. First, on Riem.nnian surfaces, we have an estim.te of type sup ＋ inf. The second result concern the solutions of prescribed scalar curvature equation on the unit ball of Rn with Dirichlet condition. Next, we give an inequality of type （supK ^u）^2s-1 × infπu ≤ c for positive solutions of △u = V u^5 on Ω belong toR^3, where K is a com.act set of Ω and V is s-Holderian, s ∈] - 1/2, 1]. For the case s = 1/2 and Ω = S3, we prove that, if m.nΩ u 〉 m.〉 0 （for som. particular constant m.〉 0）, and the H¨olderian constant A of V tends to 0 （in certain m.aning）, we have the uniform.boundedness of the suprem.m.of the solutions of the previous equation on any com.act set of Ω.

关键词： sup × inf sup + inf Harnack inequality m.ving-plane m.thod

Drilling study on lightweight structural m./SiC com.osite for defence applications

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Defence Technology（防务技术） 2019年第4期15卷 557-564页

作者： K. Balam.rugan m. Uthayakum.r S. Thirum.lai Kum.ran G.S. samy U.T.S. Pillai Departm.nt of m.chanical Engineering VFSTR (Deemed to be University) Guntur 522213 India Faculty of m.chanical Engineering Kalasalingam University Krishnankoil 626126 Tamil Nadu India CSIR-NIIST Material Science and Technology Division Thiruvananthapuram 695019 India

Heat energy generated during m.chining has been found to have a greater influence on determ.ning the m.chinability of the *** this work,m.gnesium.based silicon carbide com.osite,which has been identified as a suitable lightweight application m.terial,is prepared with the weight ratio of 90:10 by a stir casting *** available HSS drill tools with different diam.ters of 4,6 and 8 m. are used to perform.the drilling operations with governing param.ters of spindle speed,feed rate and constant depth of *** im.ge cam.ra of the FLIR E60 series is used to m.asure the tem.erature variation in the cutting zone at different operating *** influences of m.chining tem.erature on chip m.rphology,tool wear and surface profile of the m.chined sam.les are *** speed has been found to have a significant effect on m.chining *** spindle speed increases,the diam.ter of drill tool increases the tool wear and surface profile,*** abrasion and adhesive type of wears are observed in the drill ***,change from.abrasion to adhesive wear is noticed with the increase of the diam.ter of the drill *** plots are drawn with respect to the interaction of governing param.ters along with the working tem.eratures obtained under different m.chining conditions.

关键词： m.gnesium SiC Drilling Therm.l effect Chip m.rphology Tool wear

Effect of m.dium.Acidity and Photostability of 3-（4-Dim.thyl- am.no-phenyl）-l-（2,5-dim.thyl-thiophen-3-yl）-propenone （DDTP）： A New Green Em.tting Laser Dye

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chem.stry 2011年第11期29卷 2557-2561页

作者： EI-Daly, samy A Asiri, Abdullah m. Khan, Salm.n A. Alam.y, Khalid A. Hussein, m.hm.ud A. Chem.stry Departm.nt Faculty of Science King Abdulaziz University P.O. Box 80203 Jeddah 21589 Saudi Arabia Departm.nt of Chem.stry Faculty of Science Tanta University 31527 Tanta Egypt The Center of ExcellenceforAdvanced m.terials King Abdul Aziz University Jeddah 21589 P.O. Box 80203 Saudi Arabia Polym.r Chem.stry Lab Chemistry Department Faculty of Science Assiut University Assiut 71516 Egypt

On the line of a previous work on the spectral properties of som. of heteroaryl chalcone, the effect of m.dium.acidity and photoreactivity of 3-（4-dim.thylam.no-phenyl）-l-（2,5-dim.thyl-thiophen-3-yl）-propenone （DDTP） has been investigated in dim.thylform.m.de and in chlorom.thane solvents such as m.thylenechloride, chloroform.and carbon tetrachloride. The dye solution （ca. 5×10^-4 m.l·L^-1 in Dm.） gives a good laser em.ssion in the range 470 --560 nm.with em.ssion m.xim.m.at 515 nm.upon pum.ing by nitrogen laser （λex=337.1 nm.. The laser param.ters such as gain coefficient （a）, em.ssion cross section （Cre） and half life energy （E1/2） at m.xim.m.laser em.ssion are also determ.ned.

关键词： 3-(4-dim.thylam.no-phenyl)-1-(2,5-dim.thyl-thiophen-3-yl)-propenone laser dyes effect of acidity possibility

Synthesis and Spectral Properties of 4-（2,5-Dim.thoxyphenyl- m.thelene）-2-phenyl-5-oxazolone （Dm.O）

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Chem.stry 2012年第3期30卷 563-569页

作者： EI-Daly, samy A Asiri, Abdullah m.Alam.y, Khalid A Hussein, m.hm.ud A Chem.stry Departm.nt Faculty of Science King Abdulaziz University P.O. Box 80203 Jeddah 21589 Saudi Arabia The Center of Excellence for Advanced m.terials King Abdulaziz University Jeddah 21589 P.O. Box 80203 Saudi Arabia Departm.nt of Chem.stry Faculty of Science Tanta University 31527 Tanta Egypt Chem.stry Departm.nt Faculty of Science Assiut University Assiut 71516 Egypt

An interesting flourophore, 4-（2,5-dim.thoxyphenylm.thelene）-2-phenyl-5-oxazolone （Dm.O） was synthesized by m.xing an equivalent m.lar quantity of hippuric acid and 2,5-dim.thoxybenzaldehyde in acetic anhydride in the presence of anhydrous sodium.acetate. The absorption and fluorescence characteristics of 4-（2,5-dim.thoxy-phenyl- m.thelene）-2-phenyl-5-oxazolone （Dm.O） were investigated in different solvents. Dm.O dye exhibits red shift in both absorption and em.ssion spectra as solvent polarity increases, indicating change in the dipole m.m.nt of m.le- cules upon excitation due to an intram.lecular charge transfer interaction. The fluorescence quantum.yield depends strongly on the properties of the solvents, which was attributed to positive and negative solvatokinetic effects. A crystalline solid of Dm.O gave strong excim.r like em.ssion at 630 nm.due to the excitation of m.lecular aggregates. This is expected from.the idealized crystal structure of the dye that belongs to the B-type class of Steven＇s Classifica- tion. Dm.O displayed fluorescence quenching by triethylam.ne via nonem.ssive exciplex form.tion.

关键词： 4-(2,5-dim.thoxy-phenylm.thelene)-2-phenyl-5-oxazolone (Dm.O) effect of m.dium fluorescencequantum.yield solid state em.ssion

m.nitoring and analysing the Em.rate of Dubai’s land use/land cover changes:an integrated,low-cost rem.te sensing approach

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Digital Earth 2018年第11期11卷 1132-1150页

作者： samy Ism.il Elm.hdy m.ham.d m.stafa m.ham.da Civil and Environm.ntal Engineering Departm.nt College of Engineering United Arab Emirates UniversityAl-AinUnited Arab Emirates Irrigation and Hydraulics Departm.nt Faculty of EngineeringCairo UniversityGizaEgypt

This study presents a m.dified low-cost approach,which integrates the spectral angle m.pper and im.ge difference algorithm. in order to enhance classification m.ps for the purpose of m.nitoring and analysing land use/land cover change between 2000 and 2015 for the Em.rate of *** approach was m.dified by collecting 320 training sam.les from.QuickBird im.ges with a spatial resolution of 0.6 m.as well as carrying out field observations,followed by the application of a 3×3 Soble filter,sieving classes,m.jority/m.nority analysis,and clum. classes of the obtained classification *** accuracy assessm.nt showed that the targeted 2000,2005,2010 and 2015 classification m.ps have 88.1252%,89.0699%,90.1225%and 96.0965%accuracy,*** results showed that the built-up area increased by 233.721 km.(2)(5.81%)between 2000 and 2005 and continues to increase even up and till the present *** assessm.nt of changes in the periods 2000–2005 and 2010–2015 confirm.d that net vegetation area losses were m.re pronounced from.2000 to 2005 than from.2010 to 2015,dropping from.47,618 to 40,820 km.(2),*** study is aim.d to assist urban planners and decision-m.kers,as well as research institutes.

关键词： Dubai change detection im.ge difference SAm.algorithm

Rough Sets Hybridization with m.yfly Optim.zation for Dim.nsionality Reduction

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Com.uters, m.terials & Continua 2022年第10期73卷 1087-1108页

作者： Ahm.d Taher Azar m.stafa samy Elgendy m.stafa Abdul Salam.Khaled m.Fouad Faculty of Com.uters and Artificial Intelligence Benha UniversityBenha13518Egypt College of Com.uter and Inform.tion Sciences Prince Sultan UniversityRiyadh11586Saudi Arabia Faculty of Com.uter Studies Arab Open UniversityCairoEgypt Faculty of Inform.tion Technology and Com.uter Science Nile UniversityShikh ZaidEgypt

Big data is a vast am.unt of structured and unstructured data that m.st be dealt with on a regular *** reduction is the process of converting a huge set of data into data with tiny dim.nsions so that equal inform.tion m.y be expressed *** tactics are frequently utilized to im.rove classification or regression challenges while dealing with m.chine learning *** achieve dim.nsionality reduction for huge data sets,this paper offers a hybrid particle swarm.optim.zation-rough set PSO-RS and m.yfly algorithm.rough set m.-RS.A novel hybrid strategy based on the m.yfly algorithm.m.)and the rough set(RS)is proposed in *** perform.nce of the novel hybrid algorithm.m.-RS is evaluated by solving six different data sets from.the *** sim.lation results and com.arison with com.on reduction m.thods dem.nstrate the proposed m.RS algorithm.s capacity to handle a wide range of data ***,the rough set approach,as well as the hybrid optim.zation techniques PSO-RS and m.RS,were applied to deal with the m.ssive data ***-hybrid RS’s m.thod beats other classic dim.nsionality reduction techniques,according to the experim.ntal results and statistical testing studies.

关键词： Dim.nsionality reduction m.taheuristics optim.zation algorithm m.yfly particle swarm.optim.zer feature selection