检索结果-南通市图书馆

Application of 3D Seismic Data Inversion to Coal Mining Prospecting

在线全文

学校读者我要写书评

暂无评论

Journal of China University of Mining and Technology 2005年第3期15卷 218-221页

作者： liu zhao-guo DONG Shou-hua Anhut Jinsanwet Group Suzhou Anhui 234000China School of Resource and Earth Science China University of Mining ＆ Technology Xuzhou Jiangsu 221008 China

Seismic inversion is one of the most important methods for lithological prospecting . Seismic data with lowresolution is converted into impedance data of high resolution which can reflect the geological structure by inversionThe inversion technique of 3D seismic data is discussed from both methodological and theoretical aspects, and the in-version test is also carried out using actual logging data. The result is identical with the measured data obtained fromroadway of coal mine. The field tests and research results indicate that this method can provide more accurate data foridentifying thin coal seam and minor faults.

关键词： 3D seismic data inversion impedance logging data

A Composite Elastomer with Photo-responsive Shape Memory and Programmable Hygroscopic Actuation Functionalities

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2024年第10期42卷 1470-1478,I0009页

作者： Xiang-Xi Cui Li Shang Zhong-Wen liu zhao-Tie liu Jin-Qiang Jiang Guo Li Key Laboratory of Syngas Conversion of Shaanxi Province School of Chemistry and Chemical EngineeringShaanxi Normal UniversityXi’an710062China

Developing hydroscopic actuators with simultaneous high elasticity,shape programmability and tunable actuating behaviors are highly desired but still *** this study,we propose an orthogonal composite design to develop such a *** developed composite elastomer comprises carboxyl group-grafted polystyrene-block-poly(ethylene-co-butylene)-block-polystyrene(SEBS-g-COOH)as the elastic substrate,and a synthesized azobenzene derivative as the functional filler(Azo12).By surface treatment using acidic and base solutions,the carboxyl groups on the surface can reversibly transform into carboxylate groups,which render the composite tunable hygroscopic actuating *** another aspect,the added filler undergoes trans-to-cis isomerization when exposed to UV light irradiation,leading to liquefaction of the crystalline aggregates formed by Azo12 *** liquefied Azo12 molecules can autonomously resotre their trans form and reform the crystalline *** reversible change in crystralline structure is utilized to realize the shape memory property,and 5 wt%of Azo12addition is adequate for the composite to exhibit photo-responsive shape memory behavior without compromising much of the *** regualtion of external geometry by shape memory effect is effective in altering the actuating *** proposed method can be extend to designing different composites with the demonstrated functionalities.

关键词： Actuator Shape memory Photo-responsive Hygroscopic responsive Azobenzene

Application of improved back-propagation algorithms in classification and detection of scars defects on rails surfaces

在线全文

学校读者我要写书评

暂无评论

High Technology Letters 2018年第3期24卷 249-256页

作者：石甜 Kong Jianyi Wang Xingdong liu zhao School of Machinery and Automation Wuhan University of Science and Technology

An experimental platform with bracket structures,cables,parallel computer and imaging system is designed for defects detecting on steel rails. Meanwhile,an improved gradient descent algorithm based on a self-adaptive learning rate and a fixed momentum factor is developed to train back-propagation neural network for accurate and efficient defects classifications. Detection results of rolling scar defects show that such detection system can achieve accurate positioning to defects edges for its improved noise suppression. More precise characteristic parameters of defects can also be ***,defects classification is adopted to remedy the limitations of low convergence rate and local minimum. It can also attain the optimal training precision of 0. 00926 with the least 96 iterations. Finally,an enhanced identification rate of 95% has been confirmed for defects by using the detection system. It will also be positive in producing high-quality steel rails and guaranteeing the national transport safety.

关键词： detection platform steel rail improved algorithm defect classification identification rate

Quantum Currents in the coset Space SU(2)/U(1)

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2002年第1期37卷 59-62页

作者： Ding Xiang-Mao Hou Bo-Yu zhao liu Institute of Applied Mathematics Academy of Mathematics and System Sciences Academia Sinica P.O. Box 2734 Beijing 100080 China Institute of Modern Physics Northwest University Xi'an 710069 China

We propose a rational quantum deformed nonlocal currents in the homogeneous space SU(2)k/U(1), and in terms of it and a free boson field a representation for the Drinfeld currents of Yangian double at a general level k = c is obtained. In the classical limit h → 0, the quantum nonlocal currents become SU(2)k parafermion, and the realization of Yangian double becomes the parafermion realization of SU(2)k current algebra.

关键词：量子理论仿射李代数量子流 SU(2)/U(1)空间

Properties of second harmonic generation in nonlinear optical crystals CsLiB_6O_(10) and K_2Al_2B_2O_7

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

The Journal of China Universities of Posts and Telecommunications 2006年第4期13卷 77-80页

作者： SONG Chun-rong zhao Jian-jun liu JIn Department of Basic Courses Ordnance Engineering College Shijiazhuang 050003 China

The phase-matching for nonlinear optical crystal, the nonlinear phase matching angle, effective nonlinear coefficient, walk-off angles, permitted angle, and permitted wavelength are obtained in type-I and type-II phase matching in ultraviolet （UV） nonlinear optical crystals CsLiB6O10 （CLBO） and K2Al2B2O7 （KABO） by detailed theoretical simulation. Through analysis and comparison, the phase matching characteristics of the second harmonic generation in the crystals are discussed when the wavelengths of the basic frequency lights turn continually.

关键词： nonlinear optical crystals phase matching second harmonic generation (SHG) properties

Boson-Fermion Duality in A2 Toda Field Theory

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2002年第6期37卷 679-682页

作者： YANG Zhan-Ying zhao liu SHI Kang-Jie Institute of Modern Physics Northwest University Xi''an 710069 China Institute of Modern Physics Northwest University Xi''an 710069 China Institute of Modern Physics Northwest University Xi''an 710069 China

In this paper, we consider a two-dimensional integrable and conformal invariant field theory with two Diracspinors and two scalar fields. This model has chiral symmetry and CP-like symmetry. Moreover, this model also ... 详细信息

关键词： duality conformal invariant

SUPERPLASTICITY OF Al-Zn-Mg-Zr-RE AND Al-Zn-Mg-Ti ALLOYS AND THEIR CAVITATION BEHAVIOUR DURING DEFORMATION

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

Acta Metallurgica Sinica(English Letters) 1991年第8期4卷 134-138页

作者： zhao Youchang liu Aihong Jilin University,Changchun,China Jilin Univ Changchun China

The superplasticity of the Al-Zn-Mg-Zr-RE(alloy A)and Al-Zn-Mg-Ti(alloy B),their change of volume fraction of metastable micro-cavities under various reduction of area and strain rates,as well as the growth of stable cavities in them have been studied by means of small angle X-ray scattering analyses and quantitative metalloraphy ***- tal results show that the volume fraction of metastable micro-cavities of the alloy A is more than that of the alloy B,but the growth rate of stable cavities in alloy A is less than that in al- loy ***,it is believed that the superplasticity of alloy A is superior to that of alloy B.

关键词： Al-Zn-Mg alloy superplasticity cavity strain rate

Synthesis, Structure and Luminescent Property of a Zinc(Ⅱ) Coordination Polymer Incorporating Flexible Cyclohexane-1,2,3,4,5,6-hexacarboxylate Ligand

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2011年第3期27卷 354-357页

作者： WANG jind liu zhao-qing SU Ting-ting School of Chemistry and Chemical Engineering Guangzhou University Guangzhou 510006 P. R. China

The hydrothermal reaction of Zn（NO3）2·4H2O, cyclohexane-1,2,3,4,5,6-hexacarboxylic acid hydrate （H6LI·H2O, cis-conformation LI： a,e,a,e,a,e） and 2,2＇-bpy yielded a new coordination polymer [Zn2（H2LII）（2,2＇-bpy）]·2H2O（trans-conformation LII： e,e,e,e,e,e）, which was characterized by single-crystal X-ray diffraction, elemental analysis, IR and XRPD（X-ray powder diffraction）. This complex crystallized in the triclinic system, with P1 space group and parameters a=0.66922（5） nm, b=0.97291（8） nm, c=1.22184（9） nm, α=99.0020（10）°, β=99.1300（10）°, γ=99.1910（10）°, V= 0.76176（10） nm3 and Z=2. The structure is a three-dimensional supramolecular network based on linear coordination chains through π-π stacking and hydrogen bonding interactions. The confromation of the starting ligand H6LI transfromed to the H2LII. The complex emits strong luminescence at room temperature.

关键词： Coordination polymer Cyclohexane-1 2 3 4 5 6-hexacarboxylate Conformation Luminescent property

Effect of Processing Condition on Texture and Drawability of a Ferritic Rolled and Annealed Interstitial-Free Steel

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2006年第6期13卷 60-65页

作者： WANG zhao-dong GUO Yan-hui zhao Zhong liu Xiang-hua WANG Guo-dong State Key Lab of Rolling and Automation Northeastern University Shenyang 110004 Liaoning China

The processing conditions of the texture formation and deep drawability of a Ti-IF steel strip hot-rolled in ferritic region and subsequently annealed were investigated. The r-value increases with the decrease of reheating temperature, and finish rolling temperature and the increase of reductions in ferritic region. For lubricated ferritic rolling and annealing, the r-value is raised up to 1.75, and elongation rate is over 50% at the finish rolling temperature of 650 ℃, which is suitable for DDQ grade products. However, the r-value is below 1.0 in the case of unlubricated rolling. The X-ray diffraction was used to analyze the textural characteristic of samples. For samples subjected to lubricated rolling and annealing, the strong { 111 }//ND recrystallization texture is distributed homogeneously along the thickness direction, and the intensity of { 110} recrystallization texture is very low even in surface. However, for unlubricated samples, the {111} texture is distributed inhomogeneously and is weak along the thickness direction, and （110}//ND recrystallization texture is strong, which deteriorates the formability.

关键词： IF steel ferritic rolling annealing deep drawability texture