检索结果-南通市图书馆

Applied Mathematics and Mechanics(English Edition) 2021年第9期42卷 1363-1378页

作者： P.SINGH A.K.SINGH A.CHATTOPADHYAY Department of Mathematics and Computing Indian Institute of Technology(ISM)Dhanbad-826004JharkhandIndia

The reflection of three-dimensional(3D) plane waves in a highly anisotropic(triclinic) medium under the context of generalized thermoelasticity is studied. The thermoelastic nature of the 3D plane waves in an anisotropic medium is investigated in the perspective of the three-phase-lag(TPL), dual-phase-lag(DPL), Green-Naghdi-III(GNIII), Lord-Shulman(LS), and classical coupled(CL) theories. The reflection coefficients and energy ratios for all the reflected waves are obtained in a mathematical form. The rotational effects on the reflection characteristics of the 3D waves are discussed under the context of generalized thermoelasticity. Comparative analyses for the reflection coefficients of the waves among these generalized thermoelastic theories are performed. The energy ratios for each of the reflected waves establish the energy conservation law in the reflection phenomena of the plane waves. The highly anisotropic materials along with the rotation may have a significant role in the phenomenon of the reflection behavior of the 3D waves. Numerical computations are performed for the graphical representation of the study.

关键词： reflection energy ratio triclinic thermoelasticity rotation three-dimensional(3D)wave

TABLES OF SECOND-RANK ESTIMATED FORMULAS OF STRUCTURE SEMI-INVARIANT IN triclinic AND MONOCLINIC SPACE GROUPS

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 1988年第21期33卷 1788-1793页

作者：刘永盛 Changchun Institute of Applied Chemistry Acaden ia Sinica

In this report the second-rank estimated formulas of one phase structure semiinvariants of 15 space groups in triclinic and monoclinic crystal systems are given using the algebraic derivative method. These formulas ma... 详细信息

关键词： triclinic and monoclinic space groups crystal

DETERMINATION AND REFINEMENT OF THE CRYSTAL STRUCTURE OF CHAIDAMUITE

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 1990年第5期33卷 623-630页

作者：李万茂王奇光 Department of Geology Lanzhou University Lanzhou 730001 PRC Analysis and Testing Centre Lanzhou University Lanzhou 730001 PRC

Chaidamuite (ZnFe(SO_4)_2(OH). 4H_2O), which is a new sulphate mineral, belongs to the triclinic system, space group P1, with the cell parameters corrected by the least-squares method: a=7.309(2), b=7.202(2), c=9.691(3), α=89.64(3), β=105.89(3), γ=91.11(2)°, Z=2. The crystal structure has been determined by the Patterson method and Fourier syntheses and refined by the full-matrix least-squares method to an R factor of 0.032, using 2833 independent reflections. In the structure, a zigzag chain consists of [Fe(1)O_5(OH)] and [Fe(2)O_5(OH)] octahedra sharing the OH corners, and an octahedral-tetrahedral chain running parallel to the b axis consists of the zigzag chain of Fe octahedra and (SO_4) tetrahedra sharing four pairs of octahedral corners on either side of the zigzag chains. These chains are cross-linked by the isolated [Zn(1)O_2(H_2O)_4] and [Zn(2)O_2(H_2O)_4] octahedra into corrugated sheets parallel to the (100) plane. Adjacent sheets are hydrogenbonded through water molecules.

关键词： Chaidamuite crystal structure triclinic P1.

STUDY ON FACTORS AFFECTING ROOM TEMPERATURE TRANSITION OF POLYTETRAFLUOROETHYLENE

在线全文

学校读者我要写书评

暂无评论

高分子科学(英文版) 1986年第2期4卷 170-179页

作者：傅铁垣莫志深韩平綦玉臣吴淑云陈东霖 Changchun Institute of Applied Chemistry Academia Sinica Changchun Changchun

In the X-ray diffiaction intensity distribution diagram of PTFE, three diffraction peaks exist inthe range of Bragg angle 30--45°, which are very sensitive to the Crystal trausition at room *** 15℃, the crystal is triclinic and the 'small spikes' along with the main peaks appear on the dif-fraction scans due to the distortion of the unit cell, while at 23℃, distortion no longer exists, 'smallspikes' disappear completely. When the temperature is raised to 34℃, the hexagonal crystal fur-ther randomizes and the peak at Bragg angle 42°vanishes. We assigned correctly Miller index (108) tothis peak and used 2θ=30--45°region ('sensitive region') as a criterion to characterize qualita-tively the crystal transition. It has been found that some factors such as γ-irradiation, cold press-ing, drawing, calendering and copolymerization which are usually encountered in the fabrication orapplication of PTFE articles have profound effect on the crystal transition as evidenced by X-raydiffraction patterns and DSC thermograms. The information obtained in the present work isbeneficial to the use of PTFE articles.

关键词： hexagonal disappear fabrication irradiation Bragg characterize correctly longer triclinic drawing

THE SYNTHESIS AND CRYSTAL STRUCTURE OF A NOVEL MOLYBDENUM-SULFUR CLUSTER COMPLEX, （NH4）4[Mo3（NO）4S13]·3H2O

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

中国科学B辑(英文版) 1984年第7期27卷 657-664页

作者：汤卡罗金祥林唐有祺 The Laboratory for Structure of Matter Institute of Physical Chemistry Peking University Peking University

The title compound has been synthesized, the crystal structure of which has been detorminedby the single-crystal X-ray diffraction method. The crystal belongs to triclinic space group C-P1 with the unit cell parameters: a =9.535（2）A, b = 9.740（2）A, c = 15.795（4）A, α = 89.85（2）°, β = 91.80（2）°, γ = 99.37（1）°,ν = 1446.6A3, Ζ = 2. The structure is refined to R = 0.075, Rw = 0.074 for 1903 reflections. There are diverse bonding modes of molybdenum and sulfur in this eompound. The twosulfur atoms at the center bond to three molybdenum atoms from respective sides and formthe two apices of a trigonal bipyramid. Besides, there are S2-2 ligands and a polysulfur chaincomposed of three sulfur atoms. The coordination number for the three molybdenum atomsis seven. Their coordination polyhedra are somewhat distorted pentagonal bipyramid. Eachof the three NO ligands coordinated to molybdenum gives a linear group of Mo-N-O, whilethe fourth NO ligund bonded with a polysulfur chain forms a bent group of S-N

关键词： triclinic belongs molybdenum coordinated distorted Mo3 NH4 NO bonding trigonal

Hydrazine processed Cu2SnS3 thin film and their application for photovoltaic devices

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Optoelectronics 2014年第1期7卷 37-45页

作者： Jun HAN Ying ZHOU Yang Tian Ziheng HUANG Xiaohua WANG Jie ZHONG Zhe XIA Bo YANG Haisheng SONG Jiang TANG School of Science Changchun University of Science and Technology Changchun 130022 China Wuhan National Laboratory for Optoelectronics (WNLO) Huazhong University of Science and Technology Wuhan 430074 China Department of Environmental Science College of Environmental Sciences Minzu University of China Beijing 100081 China School of Optical and Electronic Information Huazhong University of Science and Technology Wuhan 430074 China

Copper tin sulfide （Cu2SnS3） was a potential earth abundant absorber material for photovoltaic device application. In this contribution, triclinic Cu2SnS3 film with phase pure composition and large grain size was fabricated from a hydrazine solution process using Cu, Sn and S as the precursors. Absorption measurement revealed this Cu2SnS3 film had a direct optical band gap of 0.88 eV, and Hall effect measurement indicated the film was p-type with hole mobility of 0.86 cmE/Vs. Finally Mo/Cu2SnS3/ CdS/ZnO/AZO/Au was produced and the best device efficiency achieved was 0.78%. Also, this device showed improved device performance during ambient storage. This study laid some foundation for the further improve- ment of Cu2SnS3 solar cell.

关键词： copper tin sulfide (Cu2SnN3) solar cell,hydrazine solution process triclinic

CRYSTAL　STRUCTURES　OF　CHARGE　TRANSFER　SALTS　（TTMTTF）2Cu2Cl6　AND　C40H72N6Se4Ni

在线全文

学校读者我要写书评

暂无评论

中国科学院大学学报(中英文) 1995年第2期 149-156页

作者： Chen Xue-an Yang Xue-yong Wu Pei-ji Zhu Dao-ben Fu Heng Tang You-qi (Institute of Chemistry, Academia Sinica, Beijing 100080)

ＣＲＹＳＴＡＬＳＴＲＵＣＴＵＲＥＳＯＦＣＨＡＲＧＥＴＲＡＮＳＦＥＲＳＡＬＴＳ（ＴＴＭＴＴＦ）２Ｃｕ２Ｃｌ６ＡＮＤＣ４０Ｈ７２Ｎ６Ｓｅ４ＮｉＣｈｅｎＸｕｅ－ａｎ；ＹａｎｇＸｕｅ－ｙｏｎｇ；ＷｕＰｅｉ－ｊｉ；ＺｈｕＤａｏ... 详细信息

ＣＲＹＳＴＡＬＳＴＲＵＣＴＵＲＥＳＯＦＣＨＡＲＧＥＴＲＡＮＳＦＥＲＳＡＬＴＳ（ＴＴＭＴＴＦ）２Ｃｕ２Ｃｌ６ＡＮＤＣ４０Ｈ７２Ｎ６Ｓｅ４ＮｉＣｈｅｎＸｕｅ－ａｎ；ＹａｎｇＸｕｅ－ｙｏｎｇ；ＷｕＰｅｉ－ｊｉ；ＺｈｕＤａｏ－ｂｅｎ；ＦｕＨｅ?..

关键词： charge transfer salt crystal structures triclinic space group

Structural, Thermal and Optical Studies of Oxypeucedanin Hydrate Monoacetate Micro-Crystals from <i>Prangos pabularia</i>

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

American Journal of Analytical Chemistry 2012年第3期3卷 204-209页

作者： Javid Ahmad Banday Feroz Ahmad Mir Saleem Farooq Mushtaq Ahmad Qurishi Surinder Koul Tej Kishen Razdan Bio-Organic Division Indian Institute of Integrative Medicine (CSIR) Jammu J&K-India Department of Chemistry University of Jammu Jammu J&K-India Department of Chemistry University of Kashmir Srinagar J&K-India Department of Material Science and Condense Matter Physics S.N. Bose National Centre for Basic Sciences Kolkata India

Oxypeucedanin hydrate monoacetate (Mol. Formula = C18H18O7) micro-crystals were obtained by acetylation of oxy-peucedanin hydrate, a furanocoumarin, isolated from the roots of Prangos pabularia. The composition related structural, thermal and optical properties were investigated. All the crystals were found to have triclinic structure. From thermal studies of these crystals, stability, melting point and other relevant informations were obtained. Their blue emission, less absorption in entire visible range and band gap predicts these crystals as good candidate for modern optoelectronic devices.

关键词： Prangos pabularia Oxypeucedanin Hydrate Monoaceate Furanocoumarin triclinic Non-Linear Optical

CRYSTAL AND MOLECULAR STRUCTURE OF A CRYPTATE COMPLEX OF EUROPIUM: C_(18)H_(36)O_6N_2Eu_2(NO_3)_6·H_2O

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Science Bulletin 1987年第3期32卷 214-215页

作者：杨光第刘世昌金钟声 Institute of Theoretical Chemistry Jilin University Changchun Department of Chemistry Nei Mongol University Hohhot Changchun Institute of Applied Chemistry

For their special coordination function, cryptate compounds will play an important part in such fields as bionics, biophysics, medicine and pesticide. But, very few research results have been reported so far on lantha... 详细信息

关键词： pesticide lanthanide H2O NO3 O6N2Eu2 slightly coordinated bidentate reacting triclinic

CRYSTAL STRUCTURE OF BENZO-15-CROWN-5-POTASSIUM TETRAIODOINDATE(Ⅲ)

在线全文

学校读者我要写书评

暂无评论

结构化学 1987年第3期 209-213页

作者： Zhou Zhixian Du Baoshi Zhang Xianxin Department of Chemistry, Zhengzhou University Liu Shixiong Huang Jinling Institute of Structuraj Chemistry, Fuzhou University

K(C14H2oO5)2InI4, Mr =1198.16, triclinic,P1,a=ll.839(3), b=12.993(4), c= 14.774(6)A,α=107.87(3),β=109.25(3),γ=95.08(2)°,V=1996.1A3, Z=2, Dc=***-3, MoKa radiation, =0.71073A, F(000)=1136e, R=0.049 for 4381 observable reflections. The structure consists of complex cation K(B15C5)2+ and complex anion InI4-. In the cation, potassium ion lies between two ether oxygen planes of two benzo-15-crown-5 molecules. In the an-ion, indium atom is tetrahedrally coordinated by four iodine atoms.

关键词： triclinic coordinated benzo crown iodine observable indium benzene anion potassium