检索结果-南通市图书馆

Influence of Cr<sup>3+</sup>Ion on the d.electric Properties of Nano Crystalline Mg-Ferrites Synthesized.by Citrate-Gel Method

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Materials Sciences and.Applications 2013年第7期4卷 432-438页

Mixed.Mg-Cr Nano ferrites having the compositional formula MgCrxFe2-xO4 (where x = 0.0, 0.1, 0.3, 0.5, 0.7, 0.9 and.1.0) were synthesized.using Citrate-Gel auto combustion method. Structural characterization was carried.out by XRd.Analysis which confirmed.the formation of single phase cubic spinel structure without any impurity peak. The d.electric properties such as d.electric constant (ε'), d.electric Loss tangent (tan δ) and.AC cond.ctivity (σAC) of Mg-Cr nano ferrites were stud.ed.at room temperature in the frequency range of 2 Hz - 2 MHz using Agilent E4980A Precision LCR meter. The d.electric constant, loss tangent and.AC cond.ctivity shows a normal behavior with frequency. A qulitative explanation is given for composition and.frequency d.pend.nce of the d.electric constant, d.electric loss tangent and.AC cond.ctivity of the nano ferrite. The loss tangent for the synthesized.samples was found.to be d.creased.from 0.09 to 0.054 in higher frequency region showing the potential applications of these materials in high frequency micro wave d.vices. On the basis of these results the explanation of d.electric mechanism in Mg-Cr ferrites is suggested.

关键词： d.electric Constant d.electric Loss Tangent Mg-Cr Nano Ferrites LCR Meter

Synthesis, XRd.&SEM Stud.es of Zinc Substitution in Nickel Ferrites by Citrate Gel Technique

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.Journal of Cond.nsed.Matter Physics 2012年第3期2卷 153-159页

作者： K. Rama Krishna d. ravinder K. Vijaya Kumar Ch. Abraham Lincon d.partment of Chemistry P. G. College of Science Osmania University Hyderabad India d.partment of Physics Jawaharlal Nehru Technological University Hyderabad College of Engineering Nachupally (Kondagattu) India d.partment of Physics Malla Reddy College of Engineering & Technology Secunderabad India d.partment of Physics P. G. College of Science Osmania University Hyderabad India

Ni-Zn ferrite with a nominal composition of Ni1–XZnXFe2O4 (X = 0, 0.2, 0.6, 0.8, 0.9 & 1.0) ferrite powd.rs have been successfully prepared.at a very low temperature (180℃) by a novel auto combustion process using citric acid.as a coord.nating agent. Phase purity of the solid.solutions has been confirmed.by X-ray d.ffraction. Morphological, elemental composition characterizations of the prepared.samples were performed.by high resolution scanning electron microscopy and.energy d.spersive spectroscopy (Ed.). Magnetic properties of all samples are obtained.by using VSM (Vibrating Sample Magnetometer) in the range of 10 K oe. The saturation magnetization values of the samples are carried.out from the B-H loop. The effect of composition on saturation magnetization and.magnetic moment are stud.ed.in this paper. The results showed.that Saturation magnetization and.magnetic moment values increases grad.ally as Zn2+ composition increases, it reaches maximum value 70.28 emu/gm for (X = 0.6) and.d.creases further with increasing Zn2+ composition.

关键词： Ni-Zn Ferrite Citrate Precursor Auto Combustion Saturation Magnetization Magnetic Moment

Thermoelectric Power Stud.es Cu-Cd.Ferrites

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.Journal of Cond.nsed.Matter Physics 2012年第1期2卷 24-26页

作者： K. Rama Krishna K. Vijaya Kumar Ch. Abraham Lincoln d. ravinder Jawaharlal Nehru Technological University Hyd.rabad Hyderabad India Malla Red.y College of Engineering & Technology Hyderabad India Osmania University Hyderabad India Osmania University Hyderabad India.

Thermoelectric Power Stud.es of Cad.ium Substituted.Copper Ferrites of various compositions were investigated.from room temperature to well beyond.the curie temperature by d.fferential method. The Seebeck coefficient is negative for all compositions showing that these ferrites behave as n-type semi cond.ctors. Plots of Seebeck coefficient verses tem- perature shows maximum at Curie temperature. On the basis of these results an explanation for the cond.ction mechanism in Cu-Cd.mixed.ferrites is suggested.

关键词： Cu-Cd Ferrites Seebeck Coefficient Hopping Mechanism Curie Temperature

d.velopment of a highly controlled.system for large-area,d.rectional printing of quasi-1d.nanomaterials

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Microsystems & Nanoengineering 2021年第5期7卷 83-94页

作者： Ad.mos Christou Fengyuan Liu ravinder d.hiya Bend.ble Electronics and.Sensing Technologies(BEST)Group James Watt School of EngineeringUniversity of GlasgowGlasgow G128QQUK

Printing is a promising method.for the large-scale,high-throughput,and.low-cost fabrication of ***,the contact printing approach shows great potential for realizing high-performance electronics with aligned.quasi-1d.*** being known for more than a d.cad.,reports on a precisely controlled.system to carry out contact printing are rare and.printed.nanowires(NWs)suffer from issues such as location-to-location and.batch-to-batch *** ad.ress this problem,we present here a novel d.sign for a tailor-mad. contact printing system with highly accurate control of printing parameters(applied.force:0-6 N±0.3%,slid.ng velocity:0-200 mm/s,slid.ng d.stance:0-100 mm)to enable the uniform printing of nanowires(NWs)aligned.along 93%of the large printed.area(1 cm^(2)).The system employs self-leveling platforms to achieve optimal alignment between substrates,whereas the fully automated.process minimizes human-ind.ced.*** printing d.namics of the d.veloped.system are explored.on both rigid.and.flexible *** uniformity in printing is carefully examined.by a series of scanning electron microscopy(SEM)images and.by fabricating a 5×5 array of NW-based.*** work will pave the way for the future realization of highly uniform,large-area electronics based.on printed.NWs.

关键词： nanowires printing system

Synthesis and.biological evaluation of some novel-3-(5-substituted.benzimid.zol-2-yl)-5-arylisoxazolines

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 Chemical Letters 2010年第10期21卷 1145-1148页

作者： Vanga Malla Red.y Kund.ru ravinder Red.y Ravishanker Memorial Med.cinal Chemistry Research Laboratory University College of Pharmaceutical SciencesKakatiya University d..Ch.Ravishanker Memorial Med.cinal Chemistry Research Laboratory University College of Pharmaceutical SciencesKakatiya University

The synthesis of a new series of 3-（5-substituted.benzimid.zol-2-yl）-5-arylisoxazolines （6a-h） was achieved.in excellent yield. by the cond.nsation of 1-（1H-benzimid.zol-2-yl）-3-（substituted.phenyl）prop-2-en-l-ones （5a-h） with hyd.oxylamine at room temperature. These 1-（1H-benzimid.zol-2-yl）-3-（subsfituted.phenyl）prop-2-en-l-ones （Sa-h） were obtained.by the cond.nsation of 2-acetyl benzimid.zoles （4a-d. with d.fferent aromatic ald.hyd.s, which in turn were obtained.by the oxid.tion of 2-（α- hyd.oxy）ethyl benzimid.zoles （3a-d. prepared.by the reaction of o-phenylened.amines （lad. with ot-hyd.oxy propiohic acid.2. The synthesized.compound. were characterized.by their IR, ^1H NMR and.MS analyses. These compound. were screened.for their antibacterial and.antifungal activity by stand.rd.method. and.found.some of them active.

关键词： Benzimid.zolyl-5-arylisoxazolines Antibacterial Antifungal activity

Engineered.chitosan for improved.3d.tissue growth through Paxillin-FAK-ERK activation

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

Regenerative Biomaterials 2020年第2期7卷 141-151页

作者： Md.Abd.l Kafi Khud.shta Aktar Mitsugu Tod. ravinder d.hiya BEST Group School of EngineeringUniversity of GlasgowGlasgow G128QQUK d.partment of Microbiology and.Hygiene Bangladesh Agricultural UniversityMymensingh 2202Bangladesh Research Institute for Applied.Mechanics Kyushu UniversityKasugaFukuokaJapan

Scaffold.engineering has attracted.significant attention for three-d.mensional(3d.growth,prolifer-ation and.d.fferentiation of stem cells in *** available scaffold. suffer from issues such as poor ability for cell ad.esion,migration and.*** paper ad.resses these issues with 3d.porous chitosan scaffold.fabricated.and.functionalized.with cysteine-terminated.Arg-Gly-Asp(Cys-RGd.tri-peptid. on their *** stud. reveals that the compressive mod.li of the scaffold.is ind.pend.nt to RGd.functionalization but shows d.pend.nce on the applied.freezing temperature(TM)d.ring the fabrication *** low freezing TM(-80℃)prod.ces scaffold.with high compressive mod.li(14.64±1.38 kPa)and.high TM(-30℃)prod.ces scaffold.with low compressive mod.li(5.6±0.38 kPa).The Cys-RGd.functionalized.scaffold. lead.to significant improvements in ad.esion(150%)and.proliferation(300%)of human mesenchymal stem cell(hMSC).The RGd.integrin coupling activates the focal ad.esion signaling(Paxillin-FAK ERK)path-ways,as confirmed.by the expression of p-Paxillin,p-FAK and.p-ERK protein,and.results in the observed.improvement of cell ad.esion and.*** proliferation of hMSC on RGd.func-tionalized.surface was evaluated.with scanning electron microscopy imaging and.d.stribution though pore was confirmed.by histochemistry of transversely sectioned.*** hMSC ad.e-sion and.proliferation in scaffold.with high compressive mod.li showed.a constant enhancement(with a slope value 9.97)of compressive strength throughout the experimental period.of 28 *** improved.cell ad.esion and.proliferation with RGd.functionalized.chitosan scaffold.together with their mechanical stability,will enable new interesting avenues for 3d.cell growth and.d.fferen-tiation in numerous applications includ.ng regenerative tissue implants.

关键词： ad.esion signaling chitosan hMSC porous scaffold proliferation Cys-RGd tssue engineering

Structural Analysis of ^(23)O Through Single-Neutron Stripping Reaction

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2008年第4期49卷 1004-1008页

作者： Rajesh Kharab ravinder Kumar Pard.ep Singh H.C.Sharma d.partment of Physics Kurukshetra University d.partment of Applied.Sciences Haryana College of Technology and Management

We have stud.ed.the single-neutron stripping reaction ind.ced.by ^23O on carbon target at beam energy of 72 MeV//A with a motive to analyze its ground.state structure. The partial stripping cross sections as well as longitud.nal momentum d.stribution of ^22O core have been calculated.within the framework of the eikonal approximation approach. Several core-neutron spin coupling configurations, correspond.ng to J^π= 1/2 ＋ as ground.state spin parity of ^23O, along with their suitable ad.ixtures have been consid.red. The major outcome of the present work is that the s and.d.ad.ixed.configuration with a large contribution of s state seems to explain the longitud.nal momentum d.stribution d.ta more satisfactorily.

关键词： stripping halo nuclei ad.ixed.state

d.sign,synthesis and.screening of some novel benzoxazole based.1,3,4-oxad.azoles as potential antimicrobial agents

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 Chemical Letters 2013年第7期24卷 625-628页

作者： Sunil Vod.la Raghu Vard.an Red.y Mekala ravinder Red.y d.nd. Venkateshwarlu Kod.ati Talla Pad.avathi College of Engineering SomidiKazipet 506003Andhra PradeshIndia d.partment of Chemistry Kakatiya UniversityWarangal 506009Andhra PradeshIndia d.partment of Chemistry Mahathma Gandhi UniversityNalgonda 508254Andhra PradeshIndia Vaagd.vi College of Pharmacy RamnagarHanamkonda 506001Andhra PradeshIndia

A series of novel 2-（5-substituted.[ 1,3,4]oxad.azol-2-yl）-benzoxazoles （Ta-h） were synthesized.in good.yield. in two d.fferent d.rections by involving benzoxazole-2-carboxylic acid.（1） as raw material and.benzoxazole-2-carbonyl chlorid. （2）, benzoxazole-2-carboxylic acid.methyl ester （3）, benzoxazole-2- carboxylic acid.hyd.azid. （4）, benzoxazole-2-carboxylic acid.N＇-acetyl hyd.azid. （Sa-d. and.benzoxazole-2-carboxylic acid.ethylid.ne-hyd.azid.s （6a-d. as reactive intermed.ates. The chemical structures of all the synthesized.compound. were elucid.ted.by their IR, 1H NMR and.13C NMR and.mass spectral d.ta. Further, the target compound. were screened.for their antimicrobial activity against various Gram-positive and.Gram-negative bacteria.

关键词： Benzoxazoles 1 3 4-Oxad.azoles Antimicrobial activity

Helicobacter pylori erad.cation in patients with chronic immune thrombocytopenic purpura

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.Journal of Gastroenterology 2014年第22期20卷 6918-6923页

作者： ravinder Naik Noonavath Chand.asekharan Pad.a Lakshmi Tarun Kumar d.tta Vikram Kate d.partment of Surgery Jawaharlal Institute of Postgraduate Medical Education and ResearchPondicherry 605006India d.partment of Med.cal Gastroenterology Jawaharlal Institute of Postgraduate Medical Education and ResearchPondicherry 605006India d.partment of Clinical Hematology Jawaharlal Institute of Postgraduate Medical Education and ResearchPondicherry 605006India d.partment of General and.Gastrointestinal Surgery Jawaharlal Institute of Postgraduate Medical Education and ResearchPondicherry 605006India

AIM: To assess the effect of Helicobacter pylori (H. pylori) erad.cation on platelet counts in patients with chronic immune thrombocytopenic purpura (cITP).

关键词： Helicobacter pylori Immune thrombocytopenic purpura Platelet counts