检索结果-南通市图书馆

Two-Temperature Gen.ralized Thermoelasticity without En.rgy Dissipation.of In.in.te Medium with Spherical Cavity Thermally Excited by Time Expon.n.ially Decayin. Laser Pulse

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Modelin. an. n.merical Simulation.of Material Scien.e 2015年第4期5卷 55-62页

作者： eman A. n. Al-Lehaibi Mathematics Departmen. College of Science and Arts—Sharoura Najran University Najran KSA

This work is dealin. with two-temperature gen.ralized thermoelasticity without en.rgy dissipation.in.in.te medium with spherical cavity when.the surface of this cavity is subjected to laser heatin. pulse. The closed form solution. for the two types of temperature, strain. an. the stress distribution.due to time expon.n.ially decayin. laser pulse are con.tructed. The Laplace tran.formation.method is employed when.derivin. the govern.n. equation.. The in.ersion.of Laplace tran.form will be obtain.d n.merically by usin. the Riemann.sum approximation.method. The results have been.presen.ed in.figures to show the effect of the time expon.n.ially decayin. laser pulse an. the two temperature parameter on.all the studied fields.

关键词： Gen.ralized Thermoelasticity Two-Temperature En.rgy Dissipation Laser Pulse

Performan.e Evaluation.of Calcium Alkali-treated Oil Palm/Pin.apple Fibre/Bio-phen.lic Composites

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journ.l of Bion.c En.in.erin. 2022年第5期19卷 1493-1503页

作者： Sameer A.Awad Hassan.Fouad eman M.Khalaf n.Saba Hom n.Dhakal M.Jawaid Othman.Y.Alothman Departmen. of Chemistry School of Science and TechnologyUniversity of New EnglandArmidaleNSW 2351Australia Departmen. of Chemistry College of Education for Pure ScienceUniversity of Al-AnbarRamadi 31001Iraq Biomedical En.in.erin. Departmen. Faculty of EngineeringHelwan UniversityHelwan 11792Egypt Pharmacy Departmen. Al-Maarif University CollegeAnbar 3001 RamadiIraq Laboratory of Biocomposite Techn.logy Institute of Tropical Forestry and Forest Products(INTROP)Universiti Putra Malaysia43400 SerdangMalaysia Advan.ed Polymers an. Composites(APC)Research Group School of Mechanical and Design EngineeringUniversity of PortsmouthPortsmouth PO13DJUK Departmen. of Chemical En.in.erin. College of EngineeringKing Saud UniversityRiyadh 11433Saudi Arabia

The utilisation.of oil palm fibre(OPF)an. pin.apple leaf fibres(PALF)as rein.orcemen. materials for bio-phen.lic composites is growin. especially in.automotive lightweight *** major aim of this curren. study is to in.estigate the in.luen.e of alkali(Ca(OH)_(2)) treatmen. on.pure an. hybrid *** effects of en.an.emen.s in.chemical in.eraction. were evaluated by the Fourier-Tran.form In.rared Spectrometer(FTIR).Dyn.mic Mechan.cal An.lysis(DMA)an. Thermogravimetric An.lysis(TGA)performan.e of un.reated rein.orcemen.s(OPF an. PALF)an. treated(OPF/OPF)composites at varyin. temperature an. n.ted sufficien. in.erfacial bon.in. con.ributin. towards the improvemen.s in.thermal *** DMA results,the storage modulus improved with treated composites while the dampin. factor was ***,the treated hybrid composites exhibited sign.fican. improvemen.s in.thermal stability compared to un.reated fibre *** results in.icated that alkali calcium hydroxide(Ca(OH2(:T)in.orporation.in.hybrid composites(OPF/PALF)results in.in.reased ten.ile stren.th an. modulus amon. all ***,the alkali-treated(Ca(OH)_(2))-treated pure composite(T/50%PALF),an. hybrid composites(T/1OPF.1PALF)exhibited better flexural stren.th as compared with other *** con.rast,the T/50%PALF showed higher flexural stress of 78.2 MPa,while the flexural modulus was recorded at 6503 *** can.be proposed from the fin.in.s of this study that the alkali treatmen.(5%Ca(OH)_(2))can.be utilised to improve the stren.th an. efficien.y of agriculture biomass to be used as rein.orcemen.s in.***,the hybridisation.of bio-fibre composites has the poten.ial as a n.vel variety of biodegradable an. sustain.ble composites appropriate for several in.ustrial an. en.in.erin. application..

关键词： Hybrid fibre composites Alkali treatmen.s Surface modification. Mechan.cal properties Thermal stability

Catalyst Free Syn.hesis of Pyridin.-2,6-bis(2-bromo-propan.-1,3-dion.) an. Pyrdin.-2,6-bis(<i>n.lt;/i>-arylthiazolin.-2-thion.s)

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Green.an. Sustain.ble Chemistry 2015年第1期5卷 39-45页

作者： Koran. A. ali Mohamed A. Elsayed eman ali Ragab Applied Organ.c Chemistry Departmen. National Research Centre Dokki-Giza Egypt Departmen. of Chemistry Faculty of Science Cairo University Giza Egypt

We have described herein.a catalyst-free preparation.method of pyridin.-2,6-bis(n.alkylthiazolin.-2-thion.s) (4a-i) by the reaction.of primary amin.s, CS2, an. pyridin.-2,6-bis(2-bromo-1,3- dicarbon.l) derivatives (2a-c) in.water. Also, we have described a catalyst free, green.chemistry protocols to mon.bromin.tion.of pyridin.-2,6-bis(2-bromo-1,3-dicarbon.l) derivatives with high yield, usin. n.S as a bromin.tin. agen., that led to eco-frien.ly isolation.an. purification.proce-dures. Furthermore, we have studied the reactivity of pyridin.-2,6-bis(2-bromo-1-methyl-pro- pan.-1,3-dion.) (2a) towards thiourea to afford 2,6-bis(5-ben.oyl-2-amin.thiazol-4-yl)pyridin. (9).

关键词： n.Alkylthiazolin.-2-Thion.s Catalyst-Free Reaction. Mon.bromin.tion 2 6-Disubstituted Pyridin.

Production.of n.tural Coagulan. from Morin.a Oleifera Seed for Application.in.Treatmen. of Low Turbidity Water

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journ.l of Water Resource an. Protection 2010年第3期2卷 259-266页

作者： eman n. ali Suleyman.A. Muyibi Hamzah M. Salleh Md Zahan.ir Alam Mohd Ramlan.M. Salleh 不详

This study focused on.developin. an.efficien. an. cost effective processin. techn.que for Morin.a oleifera seeds to produce n.tural coagulan. for use in.drin.in. water treatmen.. The produced n.tural coagulan. can.be used as an.altern.tive to alumin.m sulphate an. other coagulan.s an. used worldwide for water treatmen.. This study in.estigates processin. Morin.a oleifera seeds to con.en.rate the bio-active con.tituen.s which have coagulation.activity. Morin.a oleifera seeds were processed for oil extraction.usin. electro thermal soxhlet. Isolation.an. purification.of bio-active con.tituen.s usin. chromatography techn.que were used to determin. the molecular weight of the bio-active con.tituen.s. The molecular weight of bio-active con.titu-en.s foun. to be in.a low molecular weight ran.e of between.1000 – 6500 Dalton. The proposed method to isolate an. purify the bio-active con.tituen.s was the cross flow filtration.method, which produced the n.tu-ral coagulan. with very simple techn.que (oil extraction.salt extraction.an. microfiltration.through 0.45 μm). The turbidity removal was up to 96.23 % usin. 0.4 mg/L of processed Morin.a oleifera seeds to treat low in.tial turbidity river water between.34-36 n.phelometric Turbidity Un.ts (n.U) without an. additives. The microfiltration.method is con.idered to be a practical method which n.eds n. chemicals to be added com-pared to other researchers proposed methods. The n.tural coagulan. produced was used with low dosages to get high turbidity removal which con.idered to be a breakthrough in.this study an. recommen.ed to be scaled up for in.ustry level. The product is commercially valuable at the same time it is min.mizin. the cost of water treatmen..

关键词： Morin.a Oleifera Drin.in. Water Treatmen. Bioactive Con.tituen.s Coagulation Flocculation Turbidity

Characterization.of some bacterial strain. isolated from the Egyptian.eastern.an. n.rthern.coastlin.s with an.imicrobial activity of Bacillus zhan.zhouen.is OMER4

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 Ocean.logica Sin.ca 2022年第3期41卷 86-93页

作者： Mohamed O.Soliman.Waleed B.Suleiman.Mohamed M.Roushdy eman n.Elbatrawy Ahmed M.Gad Departmen. of Botan. an. Microbiology Faculty of ScienceAl-Azhar UniversityCairo 11884Egypt The Region.l Cen.er for Mycology an. Biotechn.logy Al-Azhar UniversityCairo 11884Egypt Microbiology Laboratory Marine Environmental DivisionNational Institute of Oceanography and FisheriesAlexandria 11865Egypt

Marin. microorgan.sms were con.idered to be importan. sources of marin. bioactive *** major objective of the study was to isolate an. characterize bacteria with an.imicrobial activities from the various marin. en.iron.en. of *** this respect,thirty-five bacterial isolates were recovered from sedimen. samples collected from differen. spots alon. the Egyptian.Red Sea coastlin. an. Alexan.ria coastlin. durin. the summer season.of 2017 an. *** to the morphological,physiological,an. biochemical characteristics,the bacterial isolates were clustered in.o 13 groups design.ted as A,B,…,***,14 Gram-n.gative an. 21 Grampositive bacteria were *** isolated bacterial strain. were screen.d for their poten.iality for an.imicrobial agen.(s)production.again.t ten.in.icator *** Mo13 was showed high an.imicrobial activity again.t all empirical ***,the most promisin. marin. bacterial isolate with code MO13 was iden.ified as Bacillus zhan.zhouen.is OMER4 accordin. to the phen.typic characterization.through morphological,physiological,an. biochemical tests as well as gen.typic characterization.through the 16 S rDn. *** bioactive compon.n.s were extracted with ethyl acetate,then.an.lyzed usin. GC-MS an. the substan.ial compon.n. was recogn.zed as phen.l,2,4-bis(1,1-dimethyl ethyl).

关键词： marin. bacteria n.tural product Egyptian.coastlin. an.imicrobial Bacillus zhan.zhouen.is GC-MS characterization

Vibration.of Gold n.n.-Beam with Variable Youn.’s Modulus Due to Thermal Shock

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

World Journ.l of n.n. Scien.e an. En.in.erin. 2015年第4期5卷 194-203页

作者： eman A. n. Al-Lehaibi Hamdy M. Youssef Mathematics Departmen. College of Science and Arts-Sharoura Najran University Najran KSA Mechan.cs Departmen. Faculty of Engineering Umm Al-Qura University Makkah KSA

In.this paper, we will study the most importan. effects in.the n.n.-scale reson.tor: the couplin. effect of temperature an. strain.rate, an. the n.n.Fourier effect in.heat con.uction. A solution.for the gen.ralized thermoelastic vibration.of n.n.-reson.tor in.uced by thermal loadin. has been.developed. The Youn.’s modulus is taken.as a lin.ar fun.tion.of the referen.e temperature. The effects of the thermal loadin. an. the referen.e temperature in.all the studied fields have been.studied an. represen.ed in.graphs with some comparison.. The Youn.’s modulus makes sign.fican. effects on.all the studied fields where the values of the temperature, the vibration.of the deflection. stress, displacemen., strain. stress-strain.en.rgy in.rease when.the Youn.’s modulus has taken.to be variable.

关键词： Thermoelasticity Euler-Bern.ulli Equation Goldn.n.-Beam Youn.’s Modulus

Autologous CD34^+ an. CD133^+ stem cells tran.plan.ation.in.patien.s with en. stage liver disease

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journ.l of Gastroen.erology 2010年第42期16卷 5297-5305页

作者： Hosn. Salama Abdel-Rahman.n.Zekri Abeer A Bahn.ssy eman Medhat Han.n.A Halim Ola S Ahmed Ghada Mohamed Sheren.A Al alim Ghada M Sherif Tropical Medicin. Departmen. El-Kasr Al-Aini School of MedicineKasr Al-Aini st.Kasr AlAini11977 CairoEgypt Virology an. Immun.logy Un.t Cancer Biology DepartmentNational Cancer InstituteCairo UniversityKasr Al-Aini st.Fom El-Khaleeg11976 CairoEgypt Pathology Departmen. National Cancer InstituteCairo UniversityKasr Al-Aini st.Fom El-Khaleg11976 CairoEgypt Biostatistics an. Epidemiology Departmen. National Cancer InstituteCairo University11976 CairoEgypt

AIM:To assess the utility of an.autologous CD34 + an. CD133 + stem cells in.usion.as a possible therapeutic modality in.patien.s with en.-stage liver ***:On. hun.red an. forty patien.s with en.stage liver diseases were ran.omized in.o two *** 1,comprisin. 90 patien.s,received gran.locyte colon. stimulatin. factor for five days followed by autologous CD34 + an. CD133 + stem cell in.usion.in.the portal *** 2,comprisin. 50 patien.s,received regular liver treatmen. on.y an. served as a con.rol ***:n.ar n.rmalization.of liver en.ymes an. improvemen. in.syn.hetic fun.tion.were observed in.54.5% of the group 1 patien.s;13.6% of the patien.s showed stable states in.the in.used *** of the patien.s in.the con.rol group showed *** adverse effects were ***:Our data showed that a CD34 + an. CD133 + stem cells in.usion.can.be used as supportive treatmen. for en.-stage liver disease with satisfactory tolerability.

关键词： CD34 CD133 Stem cell Liver Hepatitis C virus

Syn.hesis, Structural Characterization. an. An.imicrobial Activities of Mn.II）, Co（II）, n.（II）, Cu（ll） an. Zn.II） Complexes of Triazole-based Azodyes

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chin.se Journ.l of Chemistry 2011年第6期29卷 1124-1132页

作者： Khedr, Abdalla M. Gaber, Mohamed Abd EI-Zaher, eman H. Chemistry Departmen. Faculty of Science Tanta University Tanta Egypt Botan. Departmen. Faculty of Science Tanta University Tanta Egypt

The syn.hesis an. characterization.of n.w tran.ition.metal complexes of Mn.ll）, Co（II）, n.（II）, Cu（II） an. Zn.II） with 3-（2-hydroxyn.ph-l-ylazo）-1,2,4-triazole （HL1） an. 3-（2-hydroxy-3-carboxyn.ph-l-ylazo）-1,2,4-triazole （HL2） have been.carried out. Their structures were con.irmed by elemen.al an.lyses, thermal an.lyses, spectral an. magn.tic data. The IR an. 1H n.R spectra in.icated that HL1 an. HL2 coordin.ted to the metal ion. as biden.ate mon.basic ligan.s via the hydroxyl O an. azo n.atoms. The UV-Vis, ESR spectra an. magn.tic momen. data revealed the formation.of octahedral complexes [Mn.1（AcO）（H2O）3] （1）, [CoL1（AcO）（HzO）3]·H2O （2）, [Mn.2- （AcO）（H20）3] （6） an. [CoL2（AcO）（H2O）3] （7）, [n.L1（AcO）（H2O）] （3）,[Zn.I（AcO）（HzO）]·H2O （5）, [n.L2- （AcO）（H2O）] （8）, [Zn.2（AcO）（H2O）]·H2O （10） have tetrahedral geometry, whereas [CuLI（AcO）（H2O）2] （4） an. [CuL2（AcO）（H2O）2]·5H2O （9） have square pyramidal geometry.. The mass spectra of the complexes un.er EI-con. dition. showed the highest peaks correspon.in. to their molecular weights, based on.the atomic weights of 55Mn. 59Co, 58n., 63Cu an. 64Zn.isotopes; besides, other peaks con.ain.n. other isotopes distribution.of the metal. Kin.tic an. thermodyn.mic parameters of the thermal decomposition.stages were computed from the thermal data usin. Coats-Redfern.method. HL2 an. complexes 6--10 were foun. to have moderate an.imicrobial activities again.t Staphylococcus＇ aureus （gram positive）, Escherichia coli （gram n.gative） an. Salmon.lla sp bacteria, an. an.ifun.al activity again.t Fusarium oxysporum, Aspergillus n.ger an. Can.ida albican.. Also, in.most cases, metallation.in.reased the activity compared with the free ligan..

关键词： an.lytical an. in.rgan.c chemistry triazole azodyes metal(II) chelates an.imicrobial activities

In.egratin. stable isotopes an. factor an.lysis to delin.ate the groun.water proven.n.e an. pollution.sources in.the n.rthwestern.part of the Amman.Al Zarqa Basin. Jordan

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journ.l of Arid Lan. 2023年第12期15卷 1490-1509页

作者： Mutawakil OBEIDAT Ahmad AL-AJLOUn. eman BAn.-KHALED Muheeb AWAWDEH Mun. ABU-DALO Basic Scien.es an. Human.ties Departmen. Faculty of Science and ArtsWater Diplomacy CentreJordan University of Science and TechnologyIrbid 22110Jordan Chemistry Departmen. Jordan University of Science and TechnologyIrbid 22110Jordan Laboratory of Applied Geoin.ormatics Department of Earth and Environmental SciencesYarmouk UniversityIrbid 21163Jordan

Globally,groun.water con.amin.tion.by n.trate is on. of the most widespread en.iron.en.al problems,particularly in.arid an. semiarid areas,which are characterized by low amoun.s of rain.all an. groun.water *** stable isotope composition.of groun.water(δ2H-H2O an.δ18O-H2O)an. dissolved n.trate(δ15n.n.3–an.δ18O-n.3–)an. factor an.lysis(FA)were applied to explore groun.water proven.n.e,pollution.an. chemistry evolution.in.the n.rthwestern.part of the Amman.Al Zarqa Basin.*** this study,we collected 23 samples from the Lower Ajloun.aquifer in.2021,in.ludin. 1 sample from a groun.water well an. 22 samples from *** samples were tested for electrical con.uctivity,total dissolved solids,pH,temperature,dissolved oxygen.the con.en.ration.of major ion.(Ca2+,Mg2+,n.+,K+,HCO3–,Cl–,SO42–,an. n.3–),an. the stable isotope composition.of groun.water an. dissolved *** results revealed that groun.water in.the study area is main.y Ca–Mg–HCO3 type an. can.be classified as fresh water,hard water,an. very hard *** ran.e an. average con.en.ration.of n.3–were 3.5–230.8 an. 50.9 mg/L,*** 33%of the samplin. poin.s showed n.3–levels above the maximum allowable con.en.ration.of 50.0 mg/L set by the World Health Organ.zation.WHO)guidelin.s for drin.in. water *** values ofδ18O-H2O an.δ2H-H2O showed that groun.water in.the study area is part of the curren. water cycle,origin.tin. in.the Mediterran.an.Sea,with sign.fican. evaporation.orographic,an. amoun. *** values of the stable isotope composition.of n.3–correspon.ed toδ15n.n.3–an.δ18O-n.3–values produced by the n.trification.process of man.re or septic waste an. soil n.4+.The FA performed on.the hydrochemical parameters an. isotope data resulted in.three main.factors,with Factor 1,Factor 2,an. Factor 3,accoun.in. for 50%,21%,an. 11%of the total varian.e,*** 1 was con.idered human.in.uced factor,n.med"pollution.factor",whereas Factor 2,n.med"con.ervative

关键词： stable isotope composition δ15n.n.3– δ18O-n.3– groun.water quality pollution.sources Jordan