检索结果-南通市图书馆

Characterization of MnWO_4 with flower-like clusters produced using spray pyrolysis

在线全文

学校读者我要写书评

暂无评论

中国有色金属学会会刊：英文版 2009年第B9期19卷 100-104页

作者： Somchai THONGTEM Surangkana WANNAPOP Titipun THONGTEM Department of physics and Materials Science Faculty of ScienceChiang Mai University Department of Chemistry and center for Innovation in Chemistry Faculty of ScienceChiang Mai University

MnWO4 (huebnerite) with flower-like clusters of nano-plates was produced from the solutions containing MnCl2·4H2O and Na2WO4·2H2O by the 300 ℃ spray pyrolysis. The phase was detected by X-ray diffraction (XRD) and selected area electron diffraction (SAED), and is in accordance with the results characterized using energy dispersive X-ray (EDX) analysis. The flower-like clusters of nano-plates were characterized using scanning and transmission electron microscopes (SEM and TEM), and their parallel lattice planes using a high resolution transmission electron microscope (HRTEM). Vibration spectra of the huebnerite structured products were characterized using Raman and Fourier transform infrared (FTIR) spectrometers. Their photoluminescence (PL) emissions are in the same spectral region at 405-412 nm.

关键词：喷雾热分解高分辨透射电子显微镜表征产品集群傅立叶变换红外光谱 X射线衍射选区电子衍射

Silica gel-assisted solvothermal production of CdS,Cu_xS (x=1,2) and ZnS with different morphologies

在线全文

学校读者我要写书评

暂无评论

中国有色金属学会会刊：英文版 2009年第B9期19卷 105-109页

作者： Titipun THONGTEM Chalermchai PILAPONG Somchai THONGTEM Department of Chemistry and center for Innovation in Chemistry Faculty of ScienceChiang Mai University Department of physics and Materials Science Faculty of ScienceChiang Mai University

CdS, CuxS (x=1, 2) and ZnS with different morphologies were produced by the solvothermal reactions of M(CH3COO)2·2H2O (M=Cd, Cu and Zn) and NH2CSNH2 in hexane with and without silica gel as a hard template at 200 ℃ for 24 h. The product phases were detected using X-ray diffraction (XRD). Different morphologies were characterized using a scanning electron microscope (SEM). The existence of silica gel in modeling morphologies of the sulfides was characterized using Fourier transform infrared (FTIR) spectrometer. Raman spectra of different products show the vibrations at the same wavenumbers, although they are composed of different morphologies. Photoluminescence (PL) emissions of the corresponding phases with different morphologies are at the same values, but their intensities are increased by template adding.

关键词：硫化锌溶剂热形貌硅胶 CdS 傅里叶变换红外光谱硫化物形态扫描电子显微镜

Research on the Distribution of Major Metal Elements in the Typical Landslide Soil of the Three Gorges Reservoir Area

在线全文

学校读者我要写书评

暂无评论

Journal of Earth Science 2012年第2期23卷 207-212页

作者：刘鲁文项伟林兆祥刘林美吴金泉 School of Math and physics China University of Geosciences faculty of Engineering China University of Geosciences Three Gorges Research center for Geo-hazard Ministry of EducationChina University of Geosciences Laboratory for laser Spectrum Research South-Central University for Nationalities

In this article, a laboratory-built experimental system-laser-induced breakdown spec-troscopy （LIBS）, is used to measure soil samples. It explores landslides band soil of five typical land-slides in Xiangxi （香溪） River Section of the Three Gorges Reservoir area, which include Bazimen （八字门） landslide, Baijiabao （白家堡） landslide, Jiajiadian （贾家店） landslide, Sixiangxi （泗乡溪）landslide and an unnamed landslide that has already slipped. Soil samples of the five landslides are taken in dif-ferent latitudes, and in relatively consistent altitude. Through experimental measurement, the authors get spectrum of those soil samples, and then do qualitative and quantitative analyses of elements （Mg, Si, K, Al, etc.） in them. The authors conclude that main metal elements in the soil change according to different longitudes and latitudes, which opens up a new way of thinking for the quantitative analysis of the function of soil and water, and for the establishment of relations between chemical environment factors and soil engineering mechanics effects.

关键词： LIBS landslides band soil elemental analysis.

Observation of Fano-Type Interference in a Coupled Cavity-Atom System

在线全文

学校读者我要写书评

暂无评论

Chinese physics Letters 2016年第1期33卷 48-51页

作者：程雍谭政王谨朱一夫詹明生 State Key Laboratory of Magnetic Resonance and Atomic and Molecular physics Wuhan Institute of Physics and MathematicsChinese Academy of Sciences center for Cold Atom physics Chinese Academy of Sciences University of Chinese Academy of Sciences Department of physics Florida International University

We present the experimental observation of the Fano-type interference in a coupled cavity-atom system by confining the laser-cooled ^85Rb atoms in an optical cavity. The asymmetric Fano profile is obtained through quantum interference in a three-level atomic system coherently coupled to a single mode cavity field. The observed Fano profile can be explained by the interference between the intra-cavity dark state and the polariton state of the coupled cavity atom system. The possible applications of our observations include all-optical switching, optical sensing and narrow band optical filters.

关键词： of on as mode Observation of Fano-Type Interference in a Coupled Cavity-Atom System in been is

Selective microwave absorption in Nd3+ substituted barium ferrite composites

在线全文

学校读者我要写书评

暂无评论

Journal of Rare Earths 2019年第12期37卷 1320-1325页

作者： Wahyu Widanarto Siti Khaeriyah Sib Krishna Ghoshal Candra Kurniawan Mukhtar Effendi Wahyu Tri Cahyanto Department of physics FMIPAUniversitas JenderalSoedirmanJL dr.Soepamo 61Purwokerto53123Indonesia Department of physicsand laser Centre AMORGFaculty of ScienceUniversiti Teknologi MalaysiaJohor BahruSkudai81310Malaysia Research center for physics Indonesian Institute of Sciences(LIPI)Puspiptek Office AreaSouth TangerangBanten15314Indonesia

Microwave(MW)frequency based wireless communications and electronic devices became prospective due to several *** meet this need,a series of neodymium ions(Nd3+)substituted barium ferrite composites with composition(20)BaO:(80-x)Fe2 O3:(x)Nd2 O3(0≤x≤3 mol%)was prepared at1100℃using solid-state reaction *** evaluated the effect of various Nd3+ions contents on the surface morphology,structure,and magnetic properties of the as-synthesized barium ferrite ***,microwave reflection loss,complex permittivity and permeability were determined using the transmission/reflection line method in the X-band(8-12 GHz).SEM image of the composites shows that the surface morphology consists of rough and porous *** patterns of the un-doped composites reveal the existence of BaFe12O19(hexagonal)and Fe21.333O32(tetragonal)crystalline ***,a new hexagonal crystalline phase of Ba6 Nd2 Fe4 O15 with the crystallite sizes between 15 and 67 nm is observed due to Nd3+ions substitution in the *** saturation magnetization of the composite containing 2 mol%of Nd3+does not exhibit any significant alteration compared to the one devoid of Nd3+.The complex relative permitivity and permeability of the achieved composites enriched in Ba6 Nd2 Fe4 O15 and BaFe2 O4 phases disclose significant MW frequency *** composites also display selective MW absorption in the X-band which could be useful for diverse applications.

关键词： Neodymium doping Barium ferrite composites Magnetic properties Porosity MW reflection loss Rare earths

Unexpected giant negative area compressibility in palladium diselenide

在线全文

学校读者我要写书评

暂无评论

National Science Review 2023年第9期10卷 146-153页

作者： Xingxing Jiang Shengzi Zhang Dequan Jiang Yonggang Wang Maxim S.Molokeev Naizheng Wang Youquan Liu Xingyu Zhang Zheshuai Lin New Functional Crystals Group Key Laboratory of Functional Crystals and Laser TechnologyTechnical Institute of Physics and ChemistryChinese Academy of Sciences 2. Center of Materials Science and Optoelectronics EngineeringUniversity of Chinese Academy of Sciences University of Chinese Academy of Sciences center for High Pressure Science &Technology Advanced Research School of Materials Science and Engineering Peking University Laboratory of Crystal physics Kirensky Institute of PhysicsSB RAS 7. Department of Physics Far Eastern State Transport University 8. International Research Center of Spectroscopy and Quantum ChemistrySiberian Federal University

Negative area compressibility(NAC) is a counterintuitive ’squeeze-expand’ behavior in solids that is very rare but attractive due to possible pressure-response applications and coupling with rich physicochemical ***,NAC behavior is reported in palladium diselenide with a large magnitude and wide pressure *** discover that,apart from the rigid flattening of layers that has been generally recognized,the unexpected giant NAC effect in PdSe2largely comes from anomalous elongation of intralayer chemical *** structural variations are driven by intralayer-to-interlayer charge transfer with enhanced interlayer interactions under *** work updates the mechanical understanding of this anomaly and establishes a new guideline to explore novel compression-induced properties.

关键词： negative area compressibility Lifshitz mechanism charge transfer

Kinetic Monte Carlo simulation of growth of BaTiO_3 thin film via pulsed laser deposition

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

中国有色金属学会会刊：英文版 2007年第6期17卷 1441-1446页

作者：郑学军杨博朱哲吴波毛宇亮 faculty of Materials and Photoelectronic physics Xiangtan University

Considering the characteristics of perovskite structure, a kinetic Monte Carlo(KMC) model, in which Born-Mayer- Huggins(BMH) potential was introduced to calculate the interatomic interactions and the bonding ratio was defined to reflect the crystallinity, was developed to simulate the growth of BaTiO3 thin film via pulsed laser deposition(PLD). Not only the atoms deposition and adatoms diffusion, but also the bonding of adatoms were considered distinguishing with the traditional algorithm. The effects of substrate temperature, laser pulse repetition rate and incident kinetic energy on BaTiO3 thin film growth were investigated at submonolayer regime. The results show that the island density decreases and the bonding ratio increases with the increase of substrate temperature from 700 to 850 K. With the laser pulse repetition rate increasing, the island density decreases while the bonding ratio increases. With the incident kinetic energy increasing, the island density decreases except 6.2 eV

关键词：蒙特卡罗模拟脉冲激光沉积 BaTiO3薄膜钙钛矿

Sonochemical synthesis of nanostructured nickel hydroxide as an electrode material for improved electrochemical energy storage application

在线全文

学校读者我要写书评

暂无评论

Progress in Natural Science:Materials international 2017年第4期27卷 416-423页

作者： Arshid Numan Navaneethan Duraisamy Fatin Saiha Omar Dhanaraj Gopi K.Ramesh S.Ramesh center for Ionics University of Malaya Department of Physics Faculty of Science University of Malaya Department of Chemistry Periyar University

A facile and fast approach for the synthesis of a nanostructured nickel hydroxide(Ni（OH）;) via sonochemical technique is reported in the present study. The X-ray diffraction results confirmed that the synthesized Ni（OH）;was oriented in β-phase of hexagonal brucite structure. The nanostructured Ni（OH）;electrode exhibited the maximum specific capacitance of 1256 F/g at a current density of 200 mA/g in 1 M KOH;. Ni（OH）;electrodes exhibited the pseudocapacitive behavior due to the presence of redox reaction. It also exhibited long-term cyclic stability of 85% after 2000 cycles, suggesting that the nanostructured Ni（OH）;electrode will play a promising role for high performance supercapacitor application.

关键词： Nickel hydroxide Sonochemical synthesis Surface morphology Electrode materials

Picosecond pulses compression at 1053-nm center wavelength by using a gas-filled hollow-core fiber compressor

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese physics B 2015年第1期24卷 303-308页

作者：黄志远王丁冷雨欣戴晔 State Key Laboratory of High Field laser physics Shanghai Institute of Optics and Fine MechanicsChinese Academy of Sciences Department of physics Shanghai University

We theoretically study the nonlinear compression of picosecond pulses with 10-m J of input energy at the 1053-nm center wavelength by using a one-meter-long gas-filled hollow-core fiber（HCF） compressor and considering the third-order dispersion（TOD） effect. It is found that when the input pulse is about 1 ps/10 m J, it can be compressed down to less than20 fs with a high transmission efficiency. The gas for optimal compression is krypton gas which is filled in a HCF with a 400-μm inner diameter. When the input pulse duration is increased to 5 ps, it can also be compressed down to less than 100 fs efficiently under proper conditions. The results show that the TOD effect has little impact on picosecond pulse compression and the HCF compressor can be applied on compressing picosecond pulses efficiently with a high compression ratio, which will benefit the research of high-field laser physics.

关键词： picosecond pulses third-order dispersion hollow-core fiber spectrum broadening