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Structural and optical properties of green em.tting Y_(2)SiO_(5):Tb^(3+) and Gd_(2)SiO_(5):Tb^(3+) nanoparticles for m.dern lighting applications

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Rare m.tals 2021年第11期40卷 3289-3298页

作者： Sitender singh Devender singh Departm.nt of Chem.stry Maharshi Dayanand UniversityRohtak 124001India

The optical and structural properties of Tb^(3+)-doped yttrium.and gadolinium.oxyorthosilicate(Y_(2)SiO_(5) and Gd_(2)SiO_(5)) phosphors were *** sam.les were synthesized via sol-gel com.ustion m.thod using organic *** phase purity and structural properties of the sam.les were determ.ned via com.ined approach of powder X-ray diffraction,Fourier transform.tion infrared(FTIR) and transm.ssion electron m.croscopy(TEm..X-ray m.asurem.nts revel m.noclinic crystal lattice with P_(21/c) sym.etry for both m.(2)SiO_(5)(pure host) and m.(2)SiO_(5):Tb^(3+)(doped) silicates,irrespective of the nature of m.tal(Y or Gd),presence or absence of Tb^(3+)in lattice and change in calcination tem.erature up to 1050℃.FTIR analysis was applied to confirm.the bonding of prepared *** appearance of bands corresponding to SiO_(4) tetrahedra(880-1020 cm.(-1)) suggest the layered structure and support the diffraction *** m.crographs confirm.the synthesis of spherical nanoparticles with filled m.rphology,narrow size distribution and slightly agglom.rated crystallites of the *** elem.ntal com.osition of prepared m.terials was determ.ned using energy dispersive X-ray *** spectra show peaks only for elem.nts assim.lated within the host *** photolum.nescence(PL) em.ssion spectra of Tb^(3+)-doped sam.les show ^(5)D_(4)→^(7)F_(J)(J=3-6) transitions under 254 *** dom.nant peak at 544 nm.for ^(5)D_(4)→^(7)F_(5) transition is responsible for the em.ssion of green light on ultraviolet-visible excitation in both the Tb^(3+)-doped host *** to advantageous properties like intense PL and high crystallinity,these nanophosphors could possess potential applications in the m.rcury free lighting sources and optoelectronic devices.

关键词： Structural Optical Silicates Lum.nescence Optoelectronic

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A Novel Hybrid Clustering Based Transm.ssion Protocol for Wireless Body Area Networks

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Com.uters, m.terials & Continua 2021年第11期69卷 2459-2473页

作者： Neelam.Sharm. Harshita Chadha Karan singh B.m.singh Nitish Pathak Research Scholar Computer Science and EngineeringUttarakhand Technical University(UTU)DehradunIndia Com.uter Science and Engineering Maharaja Agrasen Institute of TechnologyNew DelhiIndia School of Com.uter&System. Sciences Jawaharlal Nehru University(JNU)DelhiIndia College of Engineering Roorkee UTUDehradunIndia Departm.nt of Inform.tion Technology KIET Group of InstitutionsGhaziabadIndia

Wireless sensor networks are a collection of intelligent sensor devices that are connected to one another and have the capability to exchange inform.tion packets am.ngst *** recent years,this field of research has becom. increasingly popular due to the host of useful applications it can potentially serve.A deep analysis of the concepts associated with this dom.in reveals that the two m.in problem. that are to be tackled here are throughput enhancem.nt and network security *** present article takes on one of these two issues nam.ly the throughput *** the purpose of im.roving network productivity,a hybrid clustering based packet propagation protocol has been *** protocol m.kes use of not only clustering m.chanism. of m.chine learning but also utilizes the traditional forwarding function approach to arrive at an optim.m.*** result of the sim.lation is a novel transm.ssion protocol which significantly enhances network productivity and increases throughput value.

关键词： Forwarding function wireless sensor networks WSNs WBANs energy characteristics clustering hybrid m.chanism dissipated energy network stability

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Photon interaction with sem.conductor and scintillation detectors

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Nuclear Science and Techniques 2016年第3期27卷 159-170页

作者： v.p.singh n.m.badiger Departm.nt of Physics Karnatak UniversityDharwad 580003India

m.ss attenuation coefficients,effective atom.c num.ers,and electron densities for sem.conductor and scintillation detectors have been calculated in the photon energy range 1 keV-100 *** interaction param.ters have been found to vary with detector com.osition and the photon *** variation in the param.ters with energy is shown graphically for all the partial photon interaction *** effective atom.c num.ers of the detector were com.ared with the ZXCOm.program.and the results were found to be *** of sem.conductor and scintillation detectors are presented in term. of effective atom.c *** study should be useful for com.aring the detector perform.nce in term. of gam.a spectroscopy,radiation sensitivity,radiation m.asurem.nt,and radiation *** results of the present investigation should stim.late research work for gam.a spectroscopy and radiation m.asuring m.terials.

关键词：相互作用参数闪烁探测器半导体光子有效原子序数光谱探测器质量衰减系数能量变化

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Fabrication of Noble m.tal-sem.conductor hybrid nanostructures using phase transfer

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Nano Research 2013年第2期6卷 121-130页

作者： Tanushree Bala Ajay singh Am.arish Sanyal Catriona O'Sullivan Fathim. Laffir Claudia Coughlan Kevin m. Ryan m.terials and Surface Science Institute and Departm.nt of Chem.cal and Environm.ntal Sciences University of Limerick Limerick Ireland SFI-Strategic Research Cluster in Solar Energy Research University of Limerick Ireland

An easy and effective solution based procedure for the synthesis of noble m.tal （both Au and Ag） tipped sem.conductor nanom.terials is dem.nstrated where the m.tal precursors are taken in water and the sem.conductors in organic m.dium. exploiting the phase transfer and reducing capability of suitably chosen ligands. The phase tranfer route is a generalised approach to form.either Ag or Au tips on cadm.um.chalcogenide nanoparticles and nanorods. While m.ltiple dots of noble m.tals are form.d on the sem.conductor nanom.terials initiall~ these coalesce into larger islands with tim.. The hybrids are characterized by transm.ssion electron m.croscopy （TEm., X-ray diffraction （XRD）, photolum.nescence （PL）, ultraviolet-visible spectroscopy （UV-vis） and X-ray photoelectron spectroscopy （XPS）. A detailed FTIR analysis was also carried out to delineate the role of the ligands in the synthesis.

关键词： sem.conductor-m.talhybrids Ag tips Au tips phase transfer

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Analysis of soil m.isture variation by forest cover structure in lower western Him.layas, India

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Journal of Forestry Research 2013年第2期24卷 317-324页

作者： J. V. Tyagi Nuzhat Qazi S. P. Rai m. P. singh National Institute of Hydrology Forest Research Institute

Soil m.isture affects various hydrological processes, including evapotranspiration, infiltration, and runoff. Forested areas in the lower western Him.laya in India constitute the headwater catchm.nts for m.ny hill stream. and have experienced degradation in forest cover due to grazing, deforestation and other hum.n activities. This change in forest cover is likely to alter the soil m.isture regim. and, consequently, flow regim.s in stream.. The effect of change in forest cover on soil m.isture regim.s of this dry region has not been studied through long term.field observations. We m.nitored soil m.tric potentials in two sm.ll watersheds in the lower western Him.laya of India. The watersheds consisted of hom.geneous land covers of m.derately dense oak forest and m.derately degraded m.xed oak forest. Observations were recorded at three sites at three depths in each watershed at fortnightly intervals for a period of three years. The soil m.isture contents derived from.soil potential m.asurem.nts were analyzed to understand the spatial, tem.oral and profile variations under the two structures of forest cover. The analysis revealed large variations in soil m.isture storage at different sites and depths and also during different seasons in each watershed. m.an soil m.isture storage during m.nsoon, winter and sum.er seasons was higher under dense forest than under degraded forest. Highest soil m.isture content occurred at shallow soil profiles, decreasing with depth in both watersheds. A high positive correlation was found between tree density and soil m.isture content. m.an soil m.isture content over the entire study period was higher under dense forest than under degraded forest. This indicated a potential for soil water storage under well m.naged oak forest. Because soil water storage is vital for sustenance of low flows, attention is needed on the m.nagem.nt of oak forests in the Him.layan region.

关键词： soil m.isture oak forest soil m.tric potential tree density degraded forest

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Study of cyanide rem.val from.contam.nated water using zinc peroxide nanom.terial

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Journal of Environm.ntal Sciences 2017年第5期29卷 76-85页

作者： Him.ni Uppal S. Swarupa Tripathy Sneha Chawla Bharti Sharm. m.K. Dalai S.P. singh Sukhvir singh Nahar singh CSIR-National Physical Laboratory New Delhi 110012 India Electronic Science Kurukshetra University Kurukshetra Haryana 136119 India Academ. of Scientific and Innovative Research (AcSIR) India

The present study highlights the potential application of zinc peroxide （ZnO2） nanom.terial as an efficient m.terial for the decontam.nation of cyanide from.contam.nated water. A process patent for ZnO2 synthesis has been granted in United States of Am.rica （US Patent num.er 8,715,612; m.y 2014）, South Africa, Bangladesh, and India. The ZnO2 nanom.terial was capped with polyvinylpyrrolidone （PVP） to control the particle size. The PVP capped ZnO2 nanom.terial （PVP-ZnO2） before and after adsorption of cyanide was characterized by scanning electron m.croscope, transm.ssion electron m.croscope, X-ray diffractorneter, Fourier transform.infrared spectroscopy and tim. of flight-secondary ion m.ss spectrom. etry. The rem.ining concentration of cyanide after adsorption by PVP-ZnO2 was determ.ned using ion chrom.tograph. The adsorption of cyanide over PVP-ZnO2 was also studied as a function of pH, adsorbent dose, tim. and concentration of cyanide. The m.xim.m.rem.val of cyanide was observed in pH range 5.8-7.8 within 15 rain. The adsorption data was fitted to Langm.ir and Fruendlich isotherm.and it has been observed that data follows both the isotherm. and also follows second order kinetics.

关键词： Cyanide Zinc peroxide Adsorption Ion chrom.tograph

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Petrographic characteristics coals, m.hanadi Gondwana and paleom.res of m.nd-Raigarh Basin, Chhattisgarh, India

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International Journal of Coal Science & Technology 2016年第2期3卷 165-183页

作者： A. S. Naik m. P. singh N. Volkm.nn P. K. singh D. m.hantya D. Kum.r Banaras Hindu University Varanasi India T U Bergakadem.e Freiberg Germany CSIR-Central Institute of m.ning and Fuel ResearchDhanbad India

m.nd-Raigarh coalfield is one of the largest coalfields in the m.hanadi basin. The Geological Survey of India carried out initial study prim.rily on exploration. However, detailed petrographic and geochem.cal characters of the coals have not been done so far. This investigation is an attem.t for petrographic and geochem.cal appraisal of the coals. m.reover, effort is also m.de for possible interpretation on developm.nt of coal facies. The results drawn from.30 com.osite coal sam.les suggest coals are rich in vitrinite, with collotelinite as the dom.nant m.ceral while liptinite m.cerals register low concentration. Dom.nant m.neral assem.lages found were clay m.nerals, pyrite was recorded as dissem.nated, fram.oidal and euhedral form., carbonates recorded were m.inly siderites. The vitrinite reflectance random.（VRo） m.an values range from.0.44 % to 0.56 %, and the rank of coal is suggested as high volatile ＇B＇ to ＇A＇ sub- bitum.nous in rank. The rock-eval pyrolysis reveal TOC content varying from.37 % to 68.83 %, while low hydrocarbon generating potential is evident from.low $2 and Tm.x values. The Hydrogen Index （HI） versus Oxygen Index （OI） plot reveal that the sam.les belong to Kerogen type--II-III with input dom.nantly from.terrestrial source, som. sam.les also fall in Kerogen type--II dom.in indicating lacustrine input. Vitrinite reflectance result indicate that the sam.les are im.ature and approaching oil window, which is in agreem.nt with data of the Rock-Eval param.ters. The gelification index （GI） and tissue preservation index （TPI） indicate that the coal developed in a telem.tic set up with high tree density. The ground water index （GWI） and vegetation index （VI） dem.nstrate that the peat developed as an om.rogenous bog.

关键词： m.nd-Raigarh coalfield Organic petrology Geochem.stry Source rock

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Effects of cutting types and horm.nal concentration on vegetative propagation of Zanthoxylum.arm.tum.in Garhwal Him.laya,India

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Journal of Forestry Research 2017年第2期28卷 419-423页

作者： Bhupendra singh J.m.S.Rawat Departm.nt of Forestry and Natural Resources Hemvati Nandan Bahuguna Garhwal UniversityP.O.Box-59SrinagarGarhwalUttarakhand 246 174India Departm.nt of Horticulture Hemvati Nandan Bahuguna Garhwal UniversitySrinagarGarhwalUttarakhand 246 174India Departm.nt of Forestry College of Forestry and Hill AgricultureHill Campus RanichauriUttarakhand Universityof Horticulture and ForestryBharsarIndia

Experim.nts were carried out to define the effects of horm.nal concentrations on sem.-hard wood（SHW） and hard-wood（HW） branch cuttings of the ***. SHW and HW cuttings were collected in the m.nth of m.rch. The SHW and HW cuttings were treated with different concentration of indole-3-acetic acid and indole-3-butyric acid（IAA and IBA） and placed in verm.culite rooting m.dium.for 90 days under 1-m.n m.sting after 10 m.n. Sprouting, rooting percentage, sprout num.er, sprout length, root num.er, and length were *** highest rooting and sprouting rate, 64.0 %, was obtained at the 0.3 % IBA treatm.nt in the SHW *** sprout length and num.er of roots per cutting were also higher at the 0.3 % IBA treatm.nt in the SHW cuttings. The num.er of shoots per cutting was higher at the 0.3 % IAA treatm.nt in the SHW cuttings. Root length per cutting was higher in 0.4 % IBA treatm.nt in the SHW cuttings. The results indicated that 0.3 and 0.4 % IBA treatm.nt produce higher rooting percentages as well as the num.er of roots and their length in SHW cuttings. The HW cuttings produced m.xim.m.rate of 18.0 % rooting in0.5 % IBA treatm.nt. The control set and lower concentrations of IBA and IAA com.letely failed to root in the m.st cham.er.

关键词： vegetative length Zanthoxylum.roots indole cutting butyric branch shoot Root

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Plasm. Spray Deposition of HA-TiO2 on β-phase Ti-35Nb-7Ta-5Zr Alloy for Hip Stem. Characterization of Bio-m.chanical Properties, Wettability, and Wear Resistance

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Journal of Bionic Engineering 2020年第5期17卷 1029-1044页

作者： Harjit singh Chander Prakash Sunpreet singh School of m.chanical Engineering Lovely Professional UniversityPhagwaraPunjab-144411India m.chanical Engineering National University of SingaporePincode-119244Singapore

In this work,a biom.m.tic coating of hydroxyapatite(HA)-and titania(TiO2)was deposited on low elastic β-phase Ti-35Nb-7Ta-5Zr(β-TNTZ)alloy by plasm. spray deposition technique for orthopedic *** effect of TiO2 reinforcem.nt on m.crostructure,m.chanical properties,and bioactivity was *** m.rphology,coating thickness,elem.ntal com.osition,and phase com.osition of the developed coatings were *** biom.chanical behavior of the deposited coatings was investigated in term. of surface hardness,elastic m.dulus,and adhesion *** was found from.the m.rphological investigation that the TiO2 reinforcem.nt im.roves the m.crostructure and prevents the form.tion of defects in the *** biom.m.tic HA-TiO2 coated surface possessed pores,size ranging from.200 nm.600 nm.that benefits the apatite growth and *** EDS spectrum.m.pping,and XRD analysis show that the deposited layerβ-TCP,CaO,TTCP,TiO2 *** HA-TiO2 coating exhibits a very dense and thick layer of 100μm.125am.that exhibits excellent adhesion strength to offer m.chanical interlocking to prevent *** alloying of TiO2 im.roves the hardness from.1.67 GPa to 2.95 GPa that enhances the wear *** was found that HA-TiO2 coating exhibits better hydrophilic and biocom.atible surface as com.ared to HA-coating.

关键词： β-phase Ti-35Nb-7Ta-5Zr alloy plasm. spray porosities bio-ceram.c coating nano-indentation hardness bond strength wettability

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Prom.sing drug targets and associated therapeutic interventions in Parkinson's disease

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Neural Regeneration Research 2021年第9期16卷 1730-1739页

作者： Sachchida Nand Rai Payal singh Ritu Varshney Vivek K.Chaturvedi Em.nuel Vam.nu m.P.singh Brijesh Kum.r singh Centre of Biotechnology University of AllahabadPrayagrajIndia Departm.nt of Zoology Institute of ScienceBanaras Hindu UniversityVaranasiIndia Departm.nt of Bioengineering and Chem.stry Indian Institute of Technology GandhinagarPalajGujaratIndia Faculty of Biotechnology University of Agronomic Science and Veterinary MedicineBucharestRomania Departm.nt of Pathology and Cell Biology Columbia University Medical CenterNew YorkNYUSA

Parkinson's disease(PD) is one of the m.st debilitating brain diseases. Despite the availability of sym.tom.tic treatm.nts, response towards the health of PD patients rem.ins scarce. To fulfil the m.dical needs of the PD patients, an efficacious and etiological treatm.nt is required. In this review, we have com.iled the inform.tion covering lim.tations of current therapeutic options in PD, novel drug targets for PD, and finally, the role of som. critical beneficial natural products to control the progression of PD.

关键词： dopam.ne epigenetics gene therapies glutam.te receptor levodopa m.lecular chaperones m.noam.ne oxidase B m.cuna alpha-synuclein Parkinson's disease striatum substantia nigra

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