检索结果-南通市图书馆

Structural and optical properties of green emitting Y_(2)SiO_(5):Tb^(3+) and Gd_(2)SiO_(5):Tb^(3+) nanoparticles for modern lighting applications

引用

Rare Metals 2021年第11期40卷 3289-3298页

作者： Sitender singh Devender singh Department of Chemistry 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 *** samples were synthesized via sol-gel combustion method using organic *** phase purity and structural properties of the samples were determined via combined approach of powder X-ray diffraction,Fourier transformation infrared(FTIR) and transmission electron microscopy(TEM).X-ray measurements revel monoclinic crystal lattice with P_(21/c) symmetry for both M_(2)SiO_(5)(pure host) and M_(2)SiO_(5):Tb^(3+)(doped) silicates,irrespective of the nature of metal(Y or Gd),presence or absence of Tb^(3+)in lattice and change in calcination temperature 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 *** micrographs confirm the synthesis of spherical nanoparticles with filled morphology,narrow size distribution and slightly agglomerated crystallites of the *** elemental composition of prepared materials was determined using energy dispersive X-ray *** spectra show peaks only for elements assimilated within the host *** photoluminescence(PL) emission spectra of Tb^(3+)-doped samples show ^(5)D_(4)→^(7)F_(j)(j=3-6) transitions under 254 *** dominant peak at 544 nm for ^(5)D_(4)→^(7)F_(5) transition is responsible for the emission 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 mercury free lighting sources and optoelectronic devices.

关键词： Structural Optical Silicates Luminescence Optoelectronic

来源：

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

Influence of heat treatment on the structural and optical properties of SrGd_2O_4:Eu^(3+) phosphor

引用

journal of Rare Earths 2015年第10期33卷 1040-1050页

作者： jyoti singh Pankaj Kr.Baitha j.Manam Department of Applied Physics Indian School of Mines

Novel red emitting Eu3＋ doped SrGd2O4 phosphors were synthesized by homogeneous precipitation method followed by a subsequent combustion process at various temperatures. A systematic study on the consequent structural evolution and optical properties were investigated as a function of various processing temperatures. With the enhancement of processing temperature, SrGd2O4 phosphor showed a gradual transformation from a mixed phase to monophasic nature, with minimized volatile imptwities. The microscopic images exhibited homogeneous aggregates of varying shapes and sizes with an average length of about 0.5-5μl. Eu3＋ doped SrGd2O4 phosphors prepared at low temperatures, showed miserably low values of red emission upon UV excitation owing to the presence of volatile impurities. The SrGd2O4：Eu3＋ phosphors prepared at relatively high temperature exhibited strong red-orange emissions due to homogeneously occupied Eu3＋ ions in the host lattice. The dominant red to orange （R/O） emission intensity ratios and CIE parameters of EU3＋ ions substantiated the site occupation of higher asymmetry sites of Gd3＋ ions and the strong covalent nature. Dexter theory and critical distance calculation suggested that the dipole-dipole interaction could be responsible for the concentration quenching of Eu3＋（4 mol.%） doped SrGd2O4 phosphors. Elevated physical and chemical durability and stable photoluminescence made these phosphors suitable for white LEDs and other display applications.

关键词： optical materials chemical synthesis X-ray diffraction luminescence rare earths

来源：

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

Effects of cutting types and hormonal concentration on vegetative propagation of Zanthoxylum armatum in Garhwal Himalaya,India

引用

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

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

Experiments were carried out to define the effects of hormonal concentrations on semi-hard wood（SHW） and hard-wood（HW） branch cuttings of the ***. SHW and HW cuttings were collected in the month of March. 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 vermiculite rooting medium for 90 days under 1-min misting after 10 min. Sprouting, rooting percentage, sprout number, sprout length, root number, and length were *** highest rooting and sprouting rate, 64.0 %, was obtained at the 0.3 % IBA treatment in the SHW *** sprout length and number of roots per cutting were also higher at the 0.3 % IBA treatment in the SHW cuttings. The number of shoots per cutting was higher at the 0.3 % IAA treatment in the SHW cuttings. Root length per cutting was higher in 0.4 % IBA treatment in the SHW cuttings. The results indicated that 0.3 and 0.4 % IBA treatment produce higher rooting percentages as well as the number of roots and their length in SHW cuttings. The HW cuttings produced maximum rate of 18.0 % rooting in0.5 % IBA treatment. The control set and lower concentrations of IBA and IAA completely failed to root in the mist chamber.

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

来源：

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

马铃薯叶片磷、钾含量对最高产的作用

引用

国外农学-杂粮作物 1989年第3期 46-46页

作者： j.P.singh 周桂莲

作物组织分析是鉴定一般营养缺乏、调整营养失调及预测产量的一种手段。马铃薯叶片含氮量与块茎产量之间的相关关系已有报道,但有关叶片中磷、钾含量与块茎产量间的关系尚无报道。因此,在印度贾兰达尔邦灌溉地上

关键词：预测产量营养缺乏灌溉地组织分析达尔贾兰肥料试验钾施用量研究站营养失调

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

ELECTRICAL TRANSPORT PROPERTIES OF PRISTINE AND IODINE DOPED POLYETHERIMIDES

引用

Chinese journal of Polymer Science 2011年第5期29卷 586-596页

作者： j.K.Quamara Randhir singh B.K.Kaushik Physics Department National Institute of TechnologyKurukshetra 136119India

Electrical conduction behavior of pristine and iodine doped polyetherimides （PEI） has been investigated under both transient and steady state conditions in the operating temperature range 50-200℃ at various electric fields of 12-60 kV/cm. The transient currents show the hyperbolic decay character, and the decay exponent p （a measure of current decay rate） decreases with temperature （T） and doping concentration. The origin of transient currents has been attributed to the dipolar nature of carbonyl （〉C：O） groups and the ether linkages present in the main chain of PEI. The low field steady state conduction is ohmic in nature. The magnitudes of ionic jump distance （a） values do not favor an ionic type of conduction as a possible conduction mechanism in pristine as well as iodine doped PEI. The Schottky coefficients estimations do not show the possibility of Schottky type or Poole-Frenkel type conduction mechanisms in the low temperature region （〈 120℃）, however, in the high temperature region （〉 120℃） there is a certain possibility of Poole- Frenkel type conduction mechanism in both pristine and iodine doped samples. The dual slope in the lg/versus 1/T curves for iodine doped samples indicates the presence of more than one type of trapping levels.

关键词： Transient currents Electrical conduction Polyetherimide.

来源：

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

Methods for a blind analysis of isobar data collected by the STAR collaboration

引用

Nuclear Science and Techniques 2021年第5期32卷 43-50页

作者： j.Adam L.Adamczyk j.R.Adams j.K.Adkins G.Agakishiev M.M.Aggarwal Z.Ahammed I.Alekseev D.M.Anderson A.Aparin E.C.Aschenauer M.U.Ashraf F.G.Atetalla A.Attri G.S.Averichev V.Bairathi K.Barish A.Behera R.Bellwied A.Bhasin j.Bielcik j.Bielcikova L.C.Bland I.G.Bordyuzhin j.D.Brandenburg A.V.Brandin j.Butterworth H.Caines M.Calderon de la Barca Sanchez D.Cebra I.Chakaberia P.Chaloupka B.K.Chan F-H.Chang Z.Chang N.Chankova-Bunzarova A.Chatterjee D.Chen j.Chen j.H.Chen X.Chen Z.Chen j.Cheng M.Cherney M.Chevalier S.Choudhury W.Christie X.Chu H.j.Crawford M.Csanad M.Daugherity T.G.Dedovich I.M.Deppner A.A.Derevschikov L.Didenko X.Dong j.L.Drachenberg j.C.Dunlop T.Edmonds N.Elsey j.Engelage G.Eppley S.Esumi O.Evdokimov A.Ewigleben O.Eyser R.Fatemi S.Fazio P.Federic j.Fedorisin C.j.Feng Y.Feng P.Filip E.Finch Y.Fisyak A.Francisco L.Fulek C.A.Gagliardi T.Galatyuk F.Geurts A.Gibson K.Gopal X.Gou D.Grosnick W.Guryn A.I.Hamad A.Hamed S.Harabasz j.W.Harris S.He W.He X.H.He Y.He S.Heppelmann S.Heppelmann N.Herrmann E.Hoffman L.Holub Y.Hong S.Horvat Y.Hu H.Z.Huang S.L.Huang T.Huang X.Huang T.j.Humanic P.Huo G.Igo D.Isenhower W.W.jacobs C.jena A.jentsch Y.ji j.jia K.jiang S.jowzaee X.ju E.G.judd S.Kabana M.L.Kabir S.Kagamaster D.Kalinkin K.Kang D.Kapukchyan K.Kauder H.W.Ke D.Keane A.Kechechyan M.Kelsey Y.V.Khyzhniak D.P.Kikoła C.Kim B.Kimelman D.Kincses T.A.Kinghorn I.Kisel A.Kiselev M.Kocan L.Kochenda L.K.Kosarzewski L.Kramarik P.Kravtsov K.Krueger N.Kulathunga Mudiyanselage L.Kumar S.Kumar R.Kunnawalkam Elayavalli j.H.Kwasizur R.Lacey S.Lan j.M.Landgraf j.Lauret A.Lebedev R.Lednicky j.H.Lee Y.H.Leung C.Li C.Li W.Li W.Li X.Li Y.Li Y.Liang R.Licenik T.Lin Y.Lin M.A.Lisa F.Liu H.Liu P.Liu P.Liu T.Liu X.Liu Y.Liu Z.Liu T.Ljubicic W.j.Llope R.S.Longacre N.S.Lukow S.Luo X.Luo G.L.Ma L.Ma R.Ma Y.G.Ma N.Magdy R.Majka D.Mallick S.Margetis C.Markert H.S.Matis j.A.Mazer N.G.Minaev S.Mioduszewski B.Mohanty I.Mooney Z.Moravcova D.A.Morozov M.Nagy j.D.Nam Md.Nasim K.Nayak D.Neff j.M.Nelson D.B.Nemes M.Nie G.Nigmatkulov T.Niida L.V.Nogach T.Nonak Christian University AbileneTX 796992 AGH University of Science and Technology FPACSCracow 30-059Poland Alikhanov Institute for Theoretical and Experimental Physics NRC"Kurchatov Institute" MoscowRussia 117218 Argonne National Laboratory ArgonneIL 60439 American University of Cairo New CairoNew Cairo 11835Egypt Brookhaven National Laboratory UptonNY 11973 University of California BerkeleyCA 94720 University of California DavisCA 95616 University of California Los AngelesCA 90095 University of California RiversideCA 92521 Central China Normal University Wuhan 430079 University of Illinois at Chicago ChicagoIL 60607 Creighton University OmahaNE 68178 Czech Technical University in Prague FNSPEPrague 11519Czech Republic Technische Universitat Darmstadt Darmstadt 64289Germany ELTE Eotvos Lorand University Budapest 1117Hungary Frankfurt Institute for Advanced Studies FIAS Frankfurt 60438Germany Fudan University Shanghai 200433 University of Heidelberg 69120 HeidelbergGermany University of Houston HoustonTX 77204 Huzhou University Huzhou 313000 Indian Institute of Science Education and Research(IISER) Berhampur 760010India Indian Institute of Science Education and Research(IISER)Tirupati Tirupati 517507India Indian Institute Technology PatnaBihar 801106India Indiana University BloomingtonIN 47408 Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000 University of jammu Jammu 180001India joint Institute for Nuclear Research DubnaRussia 141980 Kent State University KentOH 44242 University of Kentucky LexingtonKY 40506-0055 Lawrence Berkeley National Laboratory BerkeleyCA 94720 Lehigh University BethlehemPA 18015 Max-Planck-Institut fur Physik 80805 MunichGermany Michigan State University East LansingMI 48824 National Research Nuclear University MEPhI MoscowRussia 115409 National Institute of Science Education and Research HBNIJatni 752050India National Cheng Kung University Tainan 70101 Nuclear Physics Institute of the CAS Rez 25068Czech Republic Ohio State University

In 2018,the STAR collaboration collected data from^(96)_(44)Ru+^(96)_(44)Ru and^(96)_(40)Zr+^(96)_(40)Zr at√^(S)NN=200 Ge V to search for the presence of the chiral magnetic effect in collisions of *** isobar collision species alternated frequently between 9644 Ru+^(96)_(44)Ru and^(96)_(40)Zr+^(96)_(40)*** order to conduct blind analyses of studies related to the chiral magnetic effect in these isobar data,STAR developed a three-step blind analysis *** are initially provided a"reference sample"of data,comprised of a mix of events from the two species,the order of which respects time-dependent changes in run *** tuning analysis codes and performing time-dependent quality assurance on the reference sample,analysts are provided a species-blind sample suitable for calculating efficiencies and corrections for individual≈30-min data-taking *** this sample,species-specific information is disguised,but individual output files contain data from a single isobar *** run-by-run corrections and code alteration subsequent to these corrections are allowed at this *** these modifications,the"frozen"code is passed over the fully un-blind data,completing the blind *** a check of the feasibility of the blind analysis procedure,analysts completed a"mock data challenge,"analyzing data from Au+Au collisions at√^(S)NN=27 Ge V,collected in *** Au+Au data were prepared in the same manner intended for the isobar blind *** details of the blind analysis procedure and results from the mock data challenge are presented.

关键词： Blind analysis Chiral magnetic effect Heavy-ion collisions

来源：

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

Effect of the orientation of non-spherical metal nanoparticle with respect to light polarization on its transient optical response

引用

Nanotechnology and Precision Engineering 2023年第2期6卷 41-47页

作者： Asha singh Himanshu Srivastava Rama Chari j.jayabalan Nano Science Laboratory Materials Science SectionRaja Ramanna Centre for Advanced TechnologyIndore 452013India Lithography and Microscopy Laboratory Synchrotrons Utilization SectionRaja Ramanna Centre for Advanced TechnologyIndore 452013India

Nanoparticles with non-spherical shapes are now being widely used for various photonic *** observe experimentally that the magnitude as well as the time dependence of the transient absorption of a colloid of silver nanoplatelets depends on the relative polarization of the pump and probe *** have been a few reports about the dependence of the transient signal magnitude on polarization,but little information is available on its temporal *** a theoretical model,we show that this observed behavior arises from the fact that the energy absorption by a non-spherical nanoparticle depends on,among other factors,the nanoparticle orientation with respect to the pump and probe polarization *** is essential to consider this when estimating nanoparticle characteristics such as carrier thermalization time,carrier–phonon scattering time,and complex polarizability from transient absorption measurements.

关键词： Ultrafast dynamics Metal Nanoparticles Transient Absorption Polarization dependence

来源：

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

Wastewater treatment using Fe-doped perovskite manganites by photocatalytic degradation of methyl orange,crystal violet and indigo carmine dyes in tungsten bulb/sunlight

引用

journal of Rare Earths 2023年第9期41卷 1311-1322,I0002页

作者： Brajendra singh Priyanka singh Saiqua Siddiqui Divyanshu singh Mukul Gupta Materials Chemistry Lab Centre of Material SciencesUniversity of AllahabadPrayagraj21002India UGC-DAE Consortium for Scientific Research University CampusKhandwa Road Indore452001India

We documented(ⅰ) the decolorization of wastewater in visible light,which contains methyl orange,crystal violet and indigo carmine dyes,using La_(0.7)Sr_(0.3)Mn_(1-x)Fe_(x)O_(3)(x=0.0,0.05,0.1 and 0.5) manganites and(ⅱ) efficient separation of photocatalysts from water using magnetic *** ceramic photocatalysts were sintered at 1050℃ for 12 *** were characterized by X-ray diffraction(XRD),soft X-ray absorption spectroscopy(SXAS),Fourier transform infrared spectroscopy(FTIR) and UV-visible diffuse reflectance spectroscopy(DRS).SXAS studies show the presence of Mn(Mn^(3+)/Mn^(4+)) and Fe(Fe^(3+)/Fe^(4+)) mixes valences in Fe-doped *** band gap is found in visible light range for La_(0.7)Sr_(0.3)Mn_(1-x)Fe_(x)O_(3)(x=0.0,0.05,0.1) ***_(0.7)Sr_(0.3)MnO_(3) degrades 94.6% methyl orange in7 min,81.9% crystal violet in 10 min and 99.1% indigo carmine in 5 ***_(0.7)Sr_(0.3)Mn_(0.9)Fe_(0.1)O_(3) degrades the 92.6% methyl orange dye solution in 9 min,94.8% crystal violet in 25 min and 97.1% indigo carmine in3 *** and Fe doped manganites can be separated in 60 s from wastewater.

关键词： Synchrotron X-ray absorption Dye degradation Magnetic separation Mixed valences Rare earths Wastewater treatment

来源：

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

Insights into the interface of NiCo_(2)O_(4) spinel/LaCoO_(3) perovskite nano-composite for CO and soot oxidation

引用

journal of Environmental Sciences 2024年第4期138卷 339-349页

作者： Neha Harshita singh Satya Vir singh Department of Chemical Engineering Indian Institute of Technology(BHU)Varanasi221005India Department of Botany Institute of ScienceBanaras Hindu UniversityVaranasi221005India

In the quest for the development of thermally stable,highly active and low-cost catalysts for use in catalyzed diesel particulate filter,nano-composites are new areas of ***,we reported the easy synthesis of spinel NiCo_(2)O_(4)/perovskite LaCoO_(3) nano-composite,and its individual oxides NiCo_(2)O_(4)and LaCoO_(3) for *** detailed insights into the physio-chemical characteristics of formed NiCo_(2)O_(4)/LaCoO_(3) nano-composite were done based on various characterization analysis such as X-ray diffraction(XRD),Fourier transform infrared(FT-IR),N_(2) physiosorption,scanning electron microscopy-energy dispersive spectroscopy(SEM-EDX),transmission electron microscopy(TEM),and X-ray photoelectron spectroscopy(XPS).The characterization analysis of NiCo_(2)O_(4)/LaCoO_(3) revealed the successful formation of a chemical interface possessing strong interfacial interaction,resulting in desirable physicochemical characteristics such as small crystallite size,abundant mesoporosity,high specific surface area and activation of surface lattice *** to the desirable characteristics,the activity results over NiCo_(2)O_(4)/LaCoO_(3) nano-composite showed the excellent CO oxidation performance and high soot oxidation activity,recyclability and thermal *** work mainly attempts to emphasize the effectiveness of the facile,inexpensive and conventionally used precipitation method for the successful formation of highly efficient nano-composites.

关键词： LaCoO_(3) NiCo_(2)O_(4) Spinel/perovskite CO oxidation Soot oxidation Chemical interface

来源：

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

Nanostructured porous polyaniline(PANI)coated carbon cloth(CC)as electrodes for flexible supercapacitor device

引用

journal of Materials Science & Technology 2021年第29期88卷 168-182页

作者： Dinesh j.Ahirrao Ajay Kumar Pal Vikalp singh Neetu jha Department of Physics Institute of Chemical TechnologyMatunga(E)Mumbai400019India Department of Physics Ramniranjan Jhunjhunwala CollegeGhatkopar(W)Mumbai 400086India

Nanostructured porous polyaniline(PANI)has been synthesized and coated simultaneously on a highly flexible and conductive carbon cloth(CC)substrate using a simple in-situ chemical oxidative polymerization *** coated CC(PANI-CC)based flexible electrodes were further used for the fabrication of flexible supercapacitor *** the comparison purpose,pure PANI has also been synthesized and tested for its electrochemical *** energy storage capacity of PANI and PANI–CC composite was investigated using electrochemical techniques like CV,GCD,and EIS in a potential range from 0 to 0.8 V in 1 M H_(2)SO_(4)***-CC flexible electrodes exhibited the highest specific capacitance of 691 F/g;whereas,pure PANI could only achieve 575 F/g of specific capacitance at 1 A/*** also exhibited outstanding cyclic stability by recollecting 94%of its initial capacitance after 2000 GCD *** actual implementation,a flexible supercapacitor device has been fabricated using stainless steel sheets and PANI-CC flexile *** energy storage performance of the PANI-CC flexible supercapacitor device was tested at several bending angles,which resulted in 72%of capacitance retention at a maximum bending angle of 140°compared to the capacitance obtained at an angle 0°(flat state).PANI-CC exhibited improved electrochemical performance than pure PANI due to the synergistic effect between PANI and ***,CC helped in enhancing the conductivity and stability;whereas,PANI boosted the capacitance owing to its excellent porosity and fast pseudocapacitive charge storage response.

关键词： Polyaniline Carbon cloth Flexible supercapacitor Flexible electrode Composite

来源：

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

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：