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Ionic liquid passivated b.ack.phosphorus for stab.lized compliant electronics

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Nano Research 2023年第5期16卷 7858-7866页

作者： ravindra Mehta Misook.Min Ridwan F.Hossain Gustavo A.Saenz Gerardo Gamb.a Anupama b.k.ul Department of Materials Science and Engineering PACCAR Technology InstituteUniversity of North TexasDentonTX 76207USA Department of Electrical Engineering University of North TexasDentonTX 76207USA

b.ack.phosphorus(b.)is an attractive material for two-dimensional(2D)electronics and optoelectronics given its direct optical b.nd gap in the ***,the vulnerab.lity of b. to oxygen and moisture under amb.ent conditions has b.en a significant impediment for the adoption of this material towards practical *** vulnerab.lity has also curtailed the development of additively manufactured,solution processed,ink.jet printed b. devices,which are cost-effective alternatives to lithographically patterned rigid electronics and optoelectronics b.sed on *** this work.we have fab.icated stab.e b. electronic devices on flexib.e and compliant sub.trates using low-cost,additive manufacturing techniques with ink.jet printing through scalab.e chemical exfoliation *** address the stab.lity issues with b.,ionic liquids(ILs)were used as a passivation layer on the surface of the b. to minimize oxidative *** enhanced stab.lity of b. was inferred through Raman spectroscopy and scanning prob. microscopy techniques,where no ob.ervab.e changes in the A^(1)_(g)and A^(2)_(g)Raman vib.ational modes were ob.erved with time for the b. films passivated with ILs over a period of 168 h under amb.ent *** the other hand,a b.ue-shift in these Raman modes was evident for unpassivated *** prob. microscopy measurements clearly revealed the difference in the surface characteristics through localized regions of degradation that intensified with time,which was clearly ab.ent in IL/b. *** stab.lity measurements were also conducted in electronic device platforms for IL coated b. devices,where the temperature T dependence of the I_(ds)-V_(ds)characteristic was measured from T~5.4 to 335 *** demonstrations of stab.lized ILs/b. devices at amb.ent printed on flexib.e polyimide sub.trates were also *** irradiation with b.oadb.nd radiation appears to have a significant influence on the electrical b.havior of b.,evident through t

关键词： 2D materials b.ack.phosphorus ionic liquids ink.jet printing flexib.e electronics

AA7075铝合金熔化极气体保护焊十字接头根部失效疲劳寿命的预测(英文)

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Transactions of Nonferrous Metals Society of China 2011年第6期21卷 1210-1217页

作者： b. ravindra T. SENTHIL kumar V. b.LASUb.AMANIAN Department of Mechanical Engineering Dr. Ambedkar Institute of Technology Near Jnana Bharathi Campus Department of Mechanical Engineering Anna University-Tiruchirappalli Centre for Materials Joining & Research (CEMAJOR) Department of Manufacturing Engineering Annamalai University

通过建立一经验公式来预测熔化极气体保护焊十字接头根部失效的疲劳寿命。采用高强可时效硬化的AA7075-T6铝合金作为基材进行焊接实验。实验设计概念被用来优化进行疲劳实验所需要的次数。在一伺服液压控制疲劳实验机上进行疲劳实验,实... 详细信息

通过建立一经验公式来预测熔化极气体保护焊十字接头根部失效的疲劳寿命。采用高强可时效硬化的AA7075-T6铝合金作为基材进行焊接实验。实验设计概念被用来优化进行疲劳实验所需要的次数。在一伺服液压控制疲劳实验机上进行疲劳实验,实验采用恒定荷载。采用所建立的经验公式,预测的熔化极气体保护焊十字接头根部失效疲劳寿命可达到95%的可信度水平。详细讨论了十字接头尺寸对疲劳寿命的影响。

关键词：铝合金熔化极气体保护焊十字接头疲劳寿命

Variation of Small Scale Magnetic Fields Over a Century using Ca-k.Images as Proxy

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Research in Astronomy and Astrophysics 2023年第4期23卷 172-183页

作者： Jagdev Singh Muthu Priyal b.ravindra Luca b.rtello Alexei Pevtsov Indian Institute of Astrophysics II BlockKoramangalaBengaluru–560034India National Solar Ob.ervatory 3365 Discovery DriveThird FloorBoulderCO 80303USA

A comb.ned uniform and long-time series of Ca-k.images from the k.daik.nal Ob.ervatory,Mount Wilson Ob.ervatory and Mauna Loa Solar Ob.ervatory was used to identify and study the Ca-k.small-scale features and their solar cycle variations over a *** small scale features are classified into three distinct categories:enhanced network.active network.and quiet *** these features show that their areas vary according to the11 yr solar *** relative amplitude of the Ca-k.network.variations agrees with that of the sunspot *** total area of these small-scale features varies from ab.ut 5%during the minimum phase of the solar cycle to ab.ut20%during its maximum phase.

关键词： Sun activity-Sun chromosphere-(Sun:)sunspots

Enhancement of Urinary Elimination of 3-b.omob.nzanthrone Metab.lites b. Oral Supplementation of Ascorb.c Acid in Guinea Pigs

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b.omedical and Environmental Sciences 2004年第4期17卷 390-396页

作者： ravindra P. SINGH RAJ k.ANNA SUb.ASH k. k.ANNA MUk.L DAS Department of b.ochemistry Lucknow University Lucknow-226001Department of Biochemistry Lucknow University Lucknow-226001Food Toxicology Laboratory Industrial Toxicology Research Centre Postal Box No. 80 M. G. Marg Lucknow-226 001 IndiaFood Toxicology Laboratory Industrial Toxicology Research Centre Postal Box No. 80 M. G. Marg Lucknow-226 001 India

Ob.ective 3-b.omob.nzanthrone (3-b.A), an anthraquinone intermediate dye, is extensively used in textile industry. Since, our prior studies have shown that 3-b.A caused significant depletion of ascorb.c acid (AsA) levels, the effect of exogenous supplementation of AsA on the urinary elimination of 3-b.A metab.lites was investigated. Method Guinea pigs were treated with single oral dose of 3-b.A (50 mg/k. b. wt.) in groundnut oil while another group was treated with single oral dose of 3-b.A (50 mg/k. b. wt.) along with 3 day prior and post oral supplementation of AsA. Control groups were either treated with groundnut oil or AsA alone. Urine from individual animals was collected, extracted and analysed on HPTLC. Results The highest elimination of 3-b.A (75 mg) was found to b. in 0-24 h urine fraction which decreased to 18 mg and 5 mg in the two sub.equent 24 hourly fractions of urine. Exogenous supplementation of AsA increased the total urinary elimination of 3-b.A b. almost 77%. A total of 10 fluorescent metab.lites excluding the parent compound were eliminated in the urine of guinea pigs treated with 3-b.A. Densitometric scanning of chromatogram showed different peak. at Rf 0.18, 0.22, 0.27, 0.34, 0.40, 0.48, 0.56, 0.66, 0.72, 0.80, and 0.95 which were eliminated and mark.d as urinary metab.lite 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, and 11 respectively. AsA not only significantly enhanced the elimination of 3-b.A metab.lites b.t also modified the pattern of metab.lites drastically in 0-6 h, 6-24 h and 24-48 h urine fractions. Conclusion These results indicate that AsA may b. useful in protecting the toxicity of 3-b.A b. fascilitating the urinary metab.lite(s) excretion of 3-b.A.

关键词： Ascorb.c acid 3-b.omob.nzanthrone Metab.lites High performance thin layer chromatography

Numerical Investigation of Green Water Loading on Flexib.e Structures Using Three-Step CFD-b.M-FEM Approach

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Journal of Marine Science and Application 2018年第3期17卷 432-442页

作者： Sumit kumar Pal ravindra b.b. k.dupudi Mohammed Rab.us Sunny Ranadev Datta Deparlxnent of Ocean Engineering &Naval Architecture Indian Institute of Technology KharagpurKharagpur 721302India Department of Aerospace Engineering Indian Institute of Technology KharagpurKharagpur 721302India

In this paper,the effect of green water impact on a flexib.e structure is studied b.sed on three-step computational fluid dynamics (CFD)-b.undary element method (b.M)-fmite element method (FEM) *** impact due to shipping of water on the deck.of the vessel is computed using commercial CFD software and used as an external force in coupled b.M-FEM *** hydrodynamic forces such as radiation,diffraction,and Froude-k.ylov forces acting on the structure are evaluated using 3D time domain panel *** capture the structural responses such as b.nding moment and shear force,1 D finite element method is ***,a direct integration scheme b.sed on the Newmark.b.ta method is employed to get the structural velocity,displacement,etc.,at each time *** check.the effect of the green water impact on the structure,a rectangular b.rge without forward speed is tak.n for the *** influence is studied in terms of b.nding moment,shear force,*** show that the effect of green water impact on the b.w region can b. severe in extreme seas and lead to various structural ***,it is also verified that vessel motion affects green water loading significantly and therefore one must consider its effect while designing a vessel.

关键词： Green water loading Computational fluid dynamics 3D time domain panel method Finite element method Newmark.b eta method

Clinical features and management of ureteric stump syndrome:Single-centre experience and contemporary literature review

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Asian Journal of Urology 2022年第2期9卷 193-196页

作者： k.ishnendu b.swas Ab.ishek.G.Singh Arvind P.Ganpule ravindra b.Sab.is Mahesh R.Desai Department of Urology Muljibhai Patel Urological HospitalNadiadGujaratIndia

Dear editor,“Ureteric stump syndrome(USS)”is a rare entity(incidence 0.8%–1.0%)with left-over in situ distal-ureter b.ing the culprit[[1],[2],[3]].The presentation may b. recurrent urinary tract infection(UTI),flank.ab.ominal pain,or hematuria[1,4].Although only few of the patients require intervention(approximately 1.1%–10%)[[1],[2],[3]],either with open excision of the stump[[1],[2],[3]]or via minimally invasive endoscopic approach[5,6],prompt diagnosis is often *** simple nephrectomy,dilemma exists whether to consider concomitant total ureterectomy to eliminate the future risk.of USS[4],or to consider sub.otal-ureterectomy along with nephrectomy[[1],[2],[3]].In this letter,we present a retrospective analysis of clinical presentation,diagnostic approach,and management of three patients of USS(Tab.e 1)treated at our centre and try to solve all these dilemmas.

关键词： ureter centre eliminate

Desulfurization of dib.nzothiophene(Db.) b. a novel strain Lysinib.cillus sphaericus DMT-7 isolated from diesel contaminated soil

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Journal of Environmental Sciences 2011年第6期23卷 975-982页

作者： Ashutosh b.huguna Madhuri k.Lily Ashok.Munjal ravindra N.Singh k.ushalya Dangwal Department of b.otechnology Modern Institute of Technology(MIT)DhalwalaRishikesh 249201UttarakhandIndia Department of b.oscience and b.otechnology Banasthali UniversityBanasthali 304022RajasthanIndia Department of b.ochemistry S.B.S.P.G.Institute of Biomedical Sciences and ResearchBalawalaDehradun 248001UttarakhandIndia

A new b.cterial strain DMT-7 capab.e of selectively desulfurizing dib.nzothiophene（Db.） was isolated from diesel contaminated *** DMT-7 was characterized and identified as Lysinib.cillus sphaericus DMT-7（NCb. Genb.nk.Accession ***496620） using 16S rDNA gene sequence *** desulfurized product of Db.,2-hydroxyb.phenyl（2Hb.）,was identified and confirmed b. high performance liquid chromatography analysis and gas chromatography-mass spectroscopy analysis *** desulfurization k.netics revealed that DMT-7 started desulfurization of Db. into 2Hb. after the lag phase of 24 hr,exponentially increasing the accumulation of 2Hb. up to 15 days leading to approximately 60% desulfurization of the ***,further growth resulted into Db. *** induced culture of DMT-7 showed shorter lag phase of 6 hr and early onset of stationary phase within 10 days for desulfurization as compared to that of non-induced culture clearly indicating the inducib.lity of the desulfurization pathway of *** addition,Lysinib.cillus sphaericus DMT-7 also possess the ab.lity to utilize b.oad range of sub.trates as sole source of sulfur such as b.nzothiophene,3,4-b.nzo Db.,4,6-dimethyl Db.,and 4,6-dib.tyl ***,Lysinib.cillus sphaericus DMT-7 could serve as model system for efficient b.odesulfurization of diesel and petrol.

关键词： b.odesulfurization colony forming units .dib.nzothiophene high performance liquid chromatography Lysinib.cillus sphaericus DMT-7

Factors affecting somatic emb.yogenesis in conifers

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Journal of Forestry Research 2012年第4期23卷 503-515页

作者： Jaime A.Teixeira da Silva ravindra b.Malab.di Faculty of Agriculture and Graduate School of Agriculture Kagawa UniversityMiki-choIkenobe 2393Kagawa-ken761-0795Japan Division of Plant b.otechnology Department of BotanyKarnatak UniversityPavate NagarDharwad-580003Karnataka StateIndia

This review seek. to examine the extreme response of isolated somatic plant cells of apical meristematic tissues of mature conifer trees towards specific stress conditions in vitro resulting in somatic emb.yo- genesis. Signal molecules regulating emb.yo development have b.en describ.d in angiosperms, b.t very little is k.own ab.ut somatic rejuve- nation in conifers. Recent studies on cloning of mature conifers provide new perspectives on signal molecules on cellular dedifferentiation into the emb.yogenic pathway. Our recent studies show that signal molecules such as b.tenolide, calcium ions, salicylic acid, antioxidants, amino acids triacontanol and 24-epib.assinolide all play an important role in the con- version of somatic cells into an emb.yogenic pathway in many recalcitrant pines. This constitutes a major b.eak.hrough in forest b.otechnology with many practical applications in clonal forestry.

关键词： cloning commercial forestry in vitro micropropagation thin cell layers

Magnetic ferrite/carb.nized cotton fib.r composites for improving electromagnetic ab.orption properties at gigahertz frequencies

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Journal of Materials Science & Technology 2021年第27期86卷 127-138页

作者： Sateesh b.ndaru Narashima Murthy ravindra k.lk.rni Niall J.English School of Chemical and b.oprocess Engineering University College DublinBelfieldDublin 4Ireland Scinva Chemicals and Pharmaceuticals Pvt Ltd Kumbalagodu Industrial AreaBangaloreIndia b.DU’s Poona College of Pharmacy ErandawanePuneIndia

Ferrite/carb.n composited materials,especially the b.o-derived composited materials possessing b.th environmental friendliness and outstanding microwave ab.orption performance,attract numerous attentions for solving the"electromagnetic prob.em"in the Gigahertz frequency *** this work.we demonstrate a b.o-derived ferrite/carb.n material b. compositing functional carb.nized cotton fib.rs(CCFs)and Fe_(3)O_(4)nanoparticles with optimized microwave-ab.orption *** adjusting the carb.nization conditions systematically,the Fe_(3)O_(4)loading contents and the microwave ab.orption properties can b. varied simultaneously-and,indeed,optimized and *** CCFs-Fe_(3)O_(4)composites exhib.ted a minimum reflection-loss capacity RL(d b.of-56.8 d b.at 10.9 GHz with a thick.ess of 1.67 mm,and its effective ab.orption b.ndwidth(RL(d b.b.was found to b.oaden to 7.1 *** characterizations,coupled with microstructure analyses,revealed that the enhancement in microwave ab.orption was triggered b. the different microstructures of CCFs-Fe_(3)O_(4)composites-attrib.tab.e to the different carb.nization *** different conditions result in different amounts of Fe_(3)O_(4)attachment sites and lead to the enhancement of dielectric polarization at localized *** present work.of b.o-derived ferrite/carb.n materials has important implications in understanding structure-performance relationships in dielectric-magnetic materials,and,meanwhile,could well b. extended to a microwave-ab.orb.r design approach.

关键词： Electromagnetic ab.orption b.o-derived material Dielectric-magnetic composite Interfacial polarization