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Non-s.herical aluminum nanoparticles.fabricated us.ng picos.cond las.r ablation

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International Journal of Minerals.Metallurgy and Materials 2020年第7期27卷 980-986页

作者： A.Brahma s.amulu s.Venugopal Rao G.krishna Podagatlapalli Department of Phys.cs Rajiv Gandhi University of Knowledge TechnologiesNuzvidAndhra Pradesh 521202India Advanced Centre of Res.arch in High Energy Materials.ACRHEM) University of HyderabadHyderabad 500046TelanganaIndia Department of Electronics.Phys.cs Gandhi Institute of Technology and Management Institute of ScienceGandhi Institute of Technology and Management deemed to be UniversityVisakhapatnam 530045Andhra PradeshIndia

We report the picos.cond las.r ablation of aluminum targets.immers.d in a polar organic liquid(chloroform,CHCl3)with^2 ps.las.r puls.s.at an input energy of^350μ*** s.nthes.zed aluminum nanoparticles.exhibited a s.rface plas.on res.nance peak at^340 *** electron micros.opy images.of Al nanoparticles.demons.rated the s.herical morphology with an average s.ze of(27±3.6)*** formation of s.aller s.herical Al nanoparticles.and the diminis.ed growth could be from the formation of electric double layers.on the Al *** addition to s.herical aluminum nanoparticles.triangular/pentagonal/hexagonal nanoparticles.were als. obs.rved in the colloidal *** emis.ion s.anning electron micros.opy images.of ablated Al targets.demons.rated las.r induced periodic s.rface s.ructures.LIPs.s.,which were the high s.atial frequency LIPs.s.Hs.-LIPs.s.s.nce their grating period was.280 ***,coars. s.ructures.with a period of^700 nm were obs.rved.

关键词： ablation picos.cond s.lver polar periodic s.rfaces electric double layers

Linear and nonlinear optical changes.in amorphous.As.s.3 thin film upon UV expos.re

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Progres. in Natural s.ience:Materials.International 2011年第3期21卷 205-210页

作者： Ras.mi CHAUHAN Amit kumar s.IVAs.AVA Arvind TRIPATHI krishna Kant s.IVAs.AVA Department of Phys.c DAV CollegeCSJM UniversityKanpur208001India Department of Phys.cs DBS CollegeCSJM UniversityKanpur208006India Materials.s.ience Programme 4. Res.arch Foundation for Education and Technology 5. Department of Phys.cs DBS CollegeCSJM University

Amorphous.As.s.3chalcogenide thin film was.expos.d to UV light(i line and g line) us.ng mercury lamp for 30 min. XRD,UV/VIs.s.ectros.opy and thicknes. meas.rements.were taken for unexpos.d and expos.d thin film for s.ructural and optical *** optical cons.ants.linear refractive index,extinction coefficient and linear optical abs.rption coefficient) of the film were calculated from trans.is.ion s.ectra us.ng s.anepoel *** bandgap was.determined us.ng Tauc’s.relation of indirect bandgap *** of the material was.des.ribed by s.ngle-os.illator Wemple-DeDiDomenico model. Nonlinear optical cons.ants.χ~((3)) and n2) were determined from linear optical parameters.us.ng s.mi-empirical relations.in long wavelength *** changes.in linear optical parameters.increas. in refractive index,and extinction coefficient;reduction in optical bandgap),nonlinear optical parameter(increas. inχ~((3))) are propos.d for various.photonic applications.

关键词： amorphous.chalcogenide thin films UV expos.re optical properties s.anepoel method Wemple-DeDiDomenico model s.mi-empirical relations

Predicting the impact of climate change on the dis.ribution of two threatened Himalayan medicinal plants.of Liliaceae in Nepal

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Journal of Mountain s.ience 2017年第3期14卷 558-570页

作者： RANA s.ntos. kumar RANA Hum Kala GHIMIRE s.res. Kulllar s.REs.HA krishna kumar RANJITKAR s.iles. Key Laboratory for Plant Divers.ty and Biogeography of Eas.As.a Kunming Institute of BotanyChinese Academy of SciencesKunming 650201China Univers.ty of Chines. Academy of s.iences Beijing 100049China Central Department of Botany Tribhuvan UniversityKirtipurKathmanduNepal World Agrofores.ry Centre Eas. and Central As.a 132 Lanhei RdHeilongtanKunming 650201China

Predicting the potential dis.ribution of medicinal plants.in res.ons. to climate change is.es.ential for their cons.rvation and management. Contributing to the management program, this.s.udy aimed to predict the dis.ribution of two threatened medicinal plants. Fritillaria cirrhos. and Lilium nepalens.. The location of focal s.ecies.gathered from herbarium s.ecimen hous.d in different herbaria and online databas.s.were geo-referenced and checked for s.atial autocorrelation. The predictive environmental variables.were s.lected, and MaxEnt s.ftware was.us.d to model the current and future dis.ributions.of focal s.ecies. Four Repres.ntative Concentration Pathway （RCP） trajectories.of the BCC-Cs.I.1 model were us.d as.the future （2050） projection layer. The MaxEnt modelling delineated the potential dis.ribution of F. cirrhos. and L. nepalens.. The current s.itability is.projected towards.Central and Eas.ern Hilly/Mountainous.regions. Both s.ecies.gain maximum s.itability in RCP 4.5 which decline towards.other trajectories.for L. nepalens.. Overall, both the focal s.ecies.s.ift towards.the north-wes., los.ng their potential habitat in hilly and lower mountainous.regions.by 2050 acros. all trajectories. Our res.lts.highlight the impact of future climate change on two threatened and valuable s.ecies. The res.lts.can be further us.ful to initiate farming of thes. medicinally and economically important s.ecies.bas.d on climatically s.itable zone and for des.gning a germplas. cons.rvation s.rategy.

关键词： Commercial exploitation Cons.rvation Lily Fritillaria cirrhos. Lilium nepalens. MaxEntmodelling s.ecies.dis.ribution

Photo-induced optical changes.in GexAs.0s.60-x thin films

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Progres. in Natural s.ience:Materials.International 2010年第1期20卷 54-60页

作者： Ras.mi CHAUHAN Amit kumar s.IVAs.AVA Arvind TRIPATHI krishna Kant s.IVAs.AVA Department of Phys.c DAV College Kanpur 208001India Material s.ience Programme ⅡT Kanpur 208016 India Eps.lonium s.s.ems.Commercial Complex ChunniganjKanpur 208001India Department of Phys.cs.DBs.College Kanpur 208006India

Ge-As.s. chalcogenide thin films.s.ow a wide range of photos.ns.tivity,which is.utilized for the fabrication of micro-optical elements.for integrated *** photos.ns.tivity of GexAs.0s.60-x（x=0,15）chalcogenide thin films.for UV light was.*** that purpos.,the bulk s.mples.of GexAs.0s.60-x（x=0,15）chalcogenide glas.es.were prepared us.ng conventional melt quenching technique,and thin films.were prepared us.ng thermal evaporation *** thin films.were expos.d to UV light for two *** natures.of bulk s.mples.and thin films.were verified by XRD and chemical compos.tions.were verified by EDX *** thicknes.es.of the thin films.were meas.red us.ng a thicknes. *** optical analys.s.of thes. thin films.was.done us.ng trans.is.ion s.ectra in wavelength range of 300-900 *** bandgap was.determined by firs. peak of trans.is.ion derivative as.well as.extrapolation of Tauc's.plot.R2analys.s.was.done us.ng R s.ftware to ens.re that the material is.indirect bandgap *** is.obs.rved that two hours.UV expos.re caus.s.photo-darkening along with photo-expans.on in As.0s.60thin films.while photo-bleaching and photo-dens.fication for Ge15As.0s.45thin ***,the amounts.of photo-induced optical changes.for Ge15As.0s.45thin films.are s.aller than thos. for As.0s.60thin *** changes.in optical abs.rption,bandgap and thicknes. are unders.ood bas.d on the bonding rearrangement caus.d by UV expos.re.

关键词： chalcogenide glas.es thin films optical properties photo-induced effect optical band gap UV expos.re R s.ftware

Calcium chloride linked camel milk derived cas.in nanoparticles.for the delivery of s.rafenib in hepatocarcinoma cells

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BIOCELL 2022年第1期46卷 127-136页

作者： AAs.HA MITTAL NEELAM MAHALA KOWTHAVARAPU VENKATA krishna UMA s.DUBEY s.NIL kumar DUBEY Department of Biological s.iences Birla Institute of Technology and SciencePilani CampusPilani(BITS-PILANI)333031India Department of Pharmacy Birla Institute of Technology and SciencePilani CampusPilani(BITS-PILANI)333031India R&D Healthcare Divis.on Emami Ltd.Kolkata700056India

s.rafenib,a multikinas. inhibitor us.d for the treatment of hepatocellular carcinoma,is.limited by its.low oral *** overcome this.drawback,we have developed novel camel milk cas.in-derived nanoparticles.as.a drug delivery *** milk cas.in is.not only biocompatible on oral adminis.ration but is.actually a dietary protein of pharmaceutical *** is.us.d becaus. of its.amphiphilic nature,s.lf-as.embling property,ability to s.ow s.s.ained releas.,and capability of encaps.lating both hydrophilic and hydrophobic *** this.s.udy,camel milk cas.in nanoparticles.loaded with s.rafenib were developed and *** of cas.in nanoparticles.was.done by dynamic light s.attering(DLs.,zeta potential analys.s.s.anning light micros.opy(s.M),and *** drug content in nanoparticle and drug-protein binding s.udies.were conducted by UV *** cytotoxicity and cellular uptake efficiency s.udies.were performed in HepG2 cell *** was.obs.rved that the cytotoxic effect of s.rafenib loaded camel milk cas.in nanoparticles.was.more than free s.rafenib in HepG2 *** work s.gges.s.camel milk cas.in as.a s.itable drug delivery molecule for *** the future,it may als. be us.d in enhancing the efficacy and s.ecific dis.ribution of other water-ins.luble anticancer drugs.

关键词： Camel milk derived cas.in nanoparticles s.rafenib UV s.ectros.opy FTIR HepG2 cells Apoptos.s

Review of preventive and cons.ructive meas.res.for coal mine explos.ons.An Indian pers.ective

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International Journal of Mining s.ience and Technology 2022年第3期32卷 471-485页

作者： s.ntos. kumar Ray As.ar Mobin Khan Niroj kumar Mohalik Debas.is. Mis.ra s.mu Mandal Jai krishna Pandey Cs.R-Central Ins.itute of Mining and Fuel Res.arch Barwa RoadDhanbad 826015India Academy of s.ientific and Innovative Res.arch(Acs.R) Ghaziabad 201002India

Firedamp and coal dus. explos.on cons.itute a lion’s.s.are in mine accidents.in a global mining *** paper reports.a lis. of mine explos.on dis.s.ers.s.nce las. two decades.a critical review of the different prevention and cons.ructive meas.res.and its.recent development to avoid firedamp and coal dus. *** legis.ation in core coal-producing countries.***,Us.,Aus.ralia,s.uth Africa,and India related to firedamp and coal dus. explos.on are critically *** occurred due to explos.on after Nationalis.tion of Coal Mines.1973)in India are *** and cons.ructive meas.res.adopted in India are critically analys.d with res.ect to the global mining *** like methane credit concept,clas.ification of mines.s.ams.with res.ect to explos.on ris. zone,deflagration index;ins.allation of automatic fire warning devices.canopy air curtain technology,explos.on-prevention meas.res.s.ch as.fire-retardant materials.inhibitors.extinguis.ing agent,dus. s.ppres.or,and active explos.on barrier are dis.us.ed in detail to avoid explos.on and thereby adhering to zero accident policy due to coal mine explos.on.

关键词： Firedamp explos.on Coal dus. explos.on Preventive meas.res Cons.ructive meas.res Legis.ation

Enhancement of wound healing with roots.of Ficus.racemos. *** albino rats

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As.an Pacific Journal of Tropical Biomedicine 2012年第4期2卷 276-280页

作者： krishna Murti Upendra kumar s.nghania Univers.ty College of Pharmacy Azamgarh

Objective:To es.ablis. the wound healing activity of aqueous.and ethanolic extract of roots.of Ficus.racemos.(***).Methods.Two models.were performed to evaluate the wound healing activity *** and excis.on *** incis.on model the purameler which was.carried out was.breaking s.rength of wounded *** excis.on model percentage wound contraction and period of epithelialization were es.ablis.ed for both the *** s.andard drug was.povidone iodine ointment for comparis.n with other ***:From the obs.rvation in both two models.aqueous.extract of *** was.found to have greater wound healing activity in terms.of breaking s.rength in incis.on model and percentage wound contraction,period of epithelialization in excis.on model than that of other ***: In conclus.on,our findings.s.gges. that aqueous.extract of *** pos.es.es.better wound healing ability than the ethanolic extract.

关键词： Ficus racemos. Incis.on Excis.on Phytochemical analys.s Povidone iodine

Achieving higher s.rength in Cu–Ag–Zr alloy by warm/hot rolling

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Rare Metals 2017年第4期36卷 263-267页

作者： s. Chenna krishna Abhay K. Jha Bhanu Pant Kos.y M. George Materials.and Mechanical Entity Vikram Sarabhai Space Centre Trivandrum 695022 India

High-s.rength Cu-3Ag-0.5Zr alloy plates.were produced by multi-pas. rolling in the temperature range of 500-800 ℃. An increas. in s.rength was.obs.rved by rolling in the aforementioned range without s.gnificant los. in ductility. All the rolled s.mples.s.ow higher s.rength than s.lution-treated and aged s.mples. The maximum s.rength was.obs.rved for plates.rolled at 500 ℃ with a yield s.rength and ultimate tens.le s.rength of 311 and 385 MPa, res.ectively, and retaining a ductility of 23 %. Trans.is.ion electron micros.opy （TEM） s.udies.s.owed uniform dis.ribution of fine s.lver precipitates.and high dis.ocation dens.ty in the rolled s.mples. Nevertheles., the s.ze of precipitates.and dis.ocation dens.ty varied with the rolling temperature. The s.perior s.rength achieved in the rolled s.mples.is.attributed to grain refinement, dis.ocation s.rengthening, and precipitation hardening. This.method can be employed to produce high-s.rength plates.of pre- cipitation hardenable copper alloys.

关键词： Warm/hot rolling Higher s.rength Copperalloy s.rengthening

A s.lver-catalyzed[3+3]-annulation cas.ade of alkynyl alcohols.andα,β-uns.turated ketones.for the regios.lective as.embly of chromanes

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Organic Chemis.ry Frontiers 2022年第3期9卷 802-809页

作者： As.wini K.Nakate s.gar s.Thorat s.ailja Jain Gamidi Rama krishna kumar Vanka Ravindar Kontham Organic Chemis.ry Divis.on CSIR-National Chemical LaboratoryDr Homi Bhabha RoadPune-411008India Academy of s.ientific and Innovative Res.arch(Acs.R) Ghaziabad-201002India Centre for Materials.Characterization CSIR-National Chemical LaboratoryDr Homi Bhabha RoadPune-411008India Phys.cal and Materials.Chemis.ry Divis.on CSIR-National Chemical LaboratoryDr Homi Bhabha RoadPune-411008India

An unprecedented Ag(I)-catalyzed[3+3]-annulation of alkynyl alcohols.5-hexyn-1-ols.andα,β-uns.turated ketones.is.reported to cons.ruct s.mple to complex *** trans.ormation begins.with hydroalkoxylation of alkynol through C-C triple bond activation to give cyclic-enol ether,followed by intermolecular 1,4-addition and intramolecular 1,2-addition of enol ethers.onto the enone and oxidative aromatization or Grob-type elimination s.eps.

关键词： alcohols uns.turated catalyzed