检索结果-南通市图书馆

FRACTAL GEOMETRY STUDY OF CORRELATION BETWEEN IMPACT TOUGHNESS OF STEEL AND PARAMETERS OF FREE-CUTTING PHASE

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) 1992年第4期5卷 250-255页

作者： jiang Laizhu CUI kun Huazhong University of Science and Technology,Wuhan,China Huazhong Univ of Science and Technology Wuhan China

Studies were made of the calculation of fractal dimension of transverse impact fracture sur- face,and of the correlation between impact toughness of steel and parameters of free-cutting phase by means of the developed fractal geometry model of crack *** is believed that the area fraction,f,of free-cutting phase is negligibly influential to the longitudinal im- pact toughness,as f1 .While the aspect ratio,saying ratio of length to width,of free-cut. ting phase is inversely influential to the transverse impact *** may .be the reason why the transverse impact toughness of free-cutting steel containing more rare earth contrast to sulphur is even higher than the low sulphur containing steel.

关键词： fractal geometry impact toughness free-cutting phase

Low generational polyamidoamine dendrimers to enhance the solubility of folic acid:A‘‘dendritic effect’’investigation

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2014年第5期25卷 815-818页

作者： Yong Zhang Mei-Ying Xu Tie-kun jiang Wei-Zhe Huang jiang-Yu Wu School of Material Sciences & Engineering Wuhan Institute of Technology

Low generational（G0–G2,G for generation） polyamidoamine（PAMAM） dendrimers were investigated as enhancers to improve the aqueous solubility of folic acid at pH 11 and pH *** these two cases,the solubility of folic acid increases with both the dendrimer concentration and ***,the solubilization mechanism is *** electrostatic interaction between the primary amines of dendrimers and the ionized carboxylic groups of folic acid dominates the dissolution process at pH 11 while the increase of the solubility of folic acid at pH 5 is attributed to the hydrophobic encapsulation inside the dendrimer *** addition,for comparison ethylenediamine was used as a small molecule control to examine the ‘‘dendritic effect＇＇ in the dendrimer-related solubilization ***,PAMAM dendrimers exhibit,at pH 5,a significant superiority over ethylenediamine in enhancing solubility,whereas this ‘‘dendritic effect＇＇ cannot be observed under the basic condition.

关键词： Polyamidoamine Dendrimer Folic acid Electrostatic interaction Hydrophobic encapsulation

Two-Dimensional Images of Current and Active Power Signals for Elevator Condition Recognition

在线全文

学校读者我要写书评

暂无评论

Journal of Harbin Institute of Technology(New Series) 2023年第2期30卷 48-60页

作者： Xunsheng Ji Dazhi Wang kun jiang School of Internet of Things Engineering Jiangnan UniversityWuxi 214122JiangsuChina

In this paper, an improved two-dimensional convolution neural network(2DCNN) is proposed to monitor and analyze elevator health, based on the distribution characteristics of elevator time series data in two-dimensional images. The current and effective power signals from an elevator traction machine are collected to generate gray-scale binary images. The improved two-dimensional convolution neural network is used to extract deep features from the images for classification, so as to recognize the elevator working conditions. Furthermore, the oscillation criterion is proposed to describe and analyze the active power oscillations. The current and active power are used to synchronously describe the working condition of the elevator, which can explain the co-occurrence state and potential relationship of elevator data. Based on the improved integration of local features of the time series, the recognition accuracy of the proposed 2DCNN is 97.78%, which is better than that of a one-dimensional convolution neural network. This research can improve the real-time monitoring and visual analysis performance of the elevator maintenance personnel, as well as improve their work efficiency.

关键词： elevator condition current active power two-dimensional convolution network(2DCNN)

Two Coordination Compounds Bearing Bis（2-dimethylaminoethyl） Ether： Syntheses, Crystal Structures and Catalytic Application to the Henry Reaction

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2018年第3期34卷 358-362页

作者： LIU Chao LIU Yijie ZHANG Lili jiang kun ZHANG Li School of Chemistry and Chemical Engineering Suzhou UniversRy Suzhou 234000 P. R. China

Two novel coordination compounds, namely [Cu2（BDMAEE）（CH3COO）4],,（1） and [Ni（BDMAEE）Cl2]（2） [BDMAEE=bis（2-dimethylaminoethyl） ether], have been synthesized and characterized by IR, elemental analysis, PXRD and X-ray single crystal diffraction. In compound 1, the central Cu（Ⅱ） ion is coordinated with four oxygen atoms and one nitrogen atom, forming a distorted square pyramidal geometry. The asymmetric units composed of one Cu（Ⅱ） ion, two acetates and a half of BDMAEE are connected to form an infinite 1D chain structure by the bridging acetate and the BDMAEE. In compound 2, the central Ni（Ⅱ） ion is coordinated with one oxygen atom, two chlorine anions and two nitrogen atoms, forming a distorted square pyramidal geometry. The compounds exhibited excellent catalytic properties in the Henry reaction of nitromethane with some aromatic aldehydes, and the optimized reaction conditions were obtained.

关键词： Copper compound Nickel compound Crystal structure Henry reaction

Charge density wave in kagome superconductor AV_(3)Sb_(5)

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

Science China(Physics,Mechanics & Astronomy) 2022年第4期65卷 19-19页

作者： kun jiang Beijing National Laboratory for Condensed Matter Physics and Institute of PhysicsChinese Academy of SciencesBeijing 100190China

The kagome lattice is one of the most important platforms to investigate quantum many-body *** example,owing to its special lattice,the kagome lattice has a standard geometric frustration phenomenon in quantum *** to ... 详细信息

关键词： quantum lattice superconductor

Gradient structure induced simultaneous enhancement of strength and ductility in AZ31 Mg alloy with twin-twin interactions

在线全文

学校读者我要写书评

暂无评论

Journal of Magnesium and Alloys 2023年第8期11卷 2872-2882页

作者： Qinghui Zhang jianguo Li kun jiang Pu Li Yusheng Li Yong Zhang Tao Suo School of Aeronautics Northwestern Polytechnical UniversityXi'an 710072China Shaanxi Key Laboratory of Impact Dynamics and Its Engineering Application Xi'an 710072China Joint International Research Laboratory of Impact Dynamics and Its Engineering Application Xi'an 710072China School of Materials Science and Engineering Nanjing University of Science and TechnologyNanjing 210094China School of Materials Science and Engineering Herbert Gleiter Institute of NanoscienceNanjing University of Science and TechnologyNanjing 210094China

Gradient nanostructure was introduced to enhance the strength and ductility via deformation incompatibility accommodated by geometrical necessary dislocations for most metallic materials ***,few intensive researches were carried out to investigate the effect of gradient structure on the deformation twin evolution and resulting performance *** the present paper,we produced gradient-structured AZ31 Mg alloy with fine-grain layers,parallel twin laminates and a coarse-grain core from two upmost surfaces to the center of ***,this architected Mg alloy exhibited simultaneous enhancement of strength and *** microstructural observations demonstrated that abundant twin-twin interactions resulting from higher strength and multi-axial stress state could make great contributions to the increase of work-hardening *** was further proved by the measurement of full-field strain evolution during the plastic *** a design strategy may provide a new path for producing advanced structure materials in which the deformation twinning works as one of the dominant plasticity mechanisms.

关键词： Mg alloy Gradient structure Strength-ductility synergy Multi-orientational twins Twin-twin interactions

Screening Promising CsV_(3)Sb_(5)-Like Kagome Materials from Systematic First-Principles Evaluation

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2022年第4期39卷 54-60页

作者： Yutao jiang Ze Yu Yuxin Wang Tenglong Lu Sheng Meng kun jiang Miao Liu Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100190China Songshan Lake Materials Laboratory Dongguan 523808China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China

The Cs V_(3)Sb_(5) kagome lattice holds the promise for manifesting electron correlation,topology and ***,by far only three Cs V_(3)Sb_(5)-like kagome materials have been experimentally *** enlarge this family of materials to 1386 compounds via element species substitution,and the further screening process suggests that 28 promising candidates have superior thermodynamic stability,hence they are highly likely to be ***,these compounds possess several unique electronic structures,and can be categorized into five non-magnetic and three magnetic groups *** is our hope that this work can greatly expand the viable phase space of the Cs V_(3)Sb_(5)-like materials for investigating or tuning the novel quantum phenomena in kagome lattice.

关键词： tuning holds hence

BaCuS_(2): A Superconductor with Moderate Electron-Electron Correlation

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2021年第1期38卷 116-120页

作者： Yuhao Gu Xianxin Wu kun jiang jiangping Hu Beijing National Laboratory for Condensed Matter Physics and Institute of PhysicsChinese Academy of SciencesBeijing 100190China CAS Center of Excellence in Topological Quantum Computation and Kavli Institute of Theoretical Sciences University of Chinese Academy of SciencesBeijing 100190China

We show that the layered-structure BaCuS_(2) is a moderately correlated electron system in which the electronic structure of the CuS layer bears a resemblance to those in both cuprates and iron-based *** calculations reveal that the in-plane d-p σ^(*)-bonding bands are isolated near the Fermi *** the energy separation between the d and p orbitals are much smaller than those in cuprates and iron-based superconductors,BaCuS_(2) is expected to be moderately *** suggest that this material is an ideal system to study the competitive/collaborative nature between two distinct superconducting pairing mechanisms,namely the conventional BCS electron-phonon interaction and the electron-electron correlation,which may be helpful to establish the elusive mechanism of unconventional high-temperature superconductivity.

关键词： Electron system bonding

Cobalt-Dimer Nitrides:A Potential Novel Family of High-Temperature Superconductors

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2022年第9期39卷 67-71页

作者： Yuhao Gu kun jiang Xianxin Wu jiangping Hu Beijing National Laboratory for Condensed Matter Physics and Institute of PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100190China Institute of Theoretical Physics Chinese Academy of SciencesBeijing 100190China Kavli Institute of Theoretical Sciences University of Chinese Academy of SciencesBeijing 100190China

We predict that the square lattice layer formed by[Co_(2)N_(2)]_(2)-diamond-like units can host high-temperature *** layer appears in the stable ternary cobalt nitride,Ba Co_(2)N_(2).The electronic physics of the material stems from Co_(2)N_(2)layers where the dimerized Co pairs form a square *** low energy physics near Fermi energy can be described by an effective two-orbital *** considering interlayer couplings,the two orbitals are effectively *** electronic structure satisfies the“gene”character proposed for unconventional high-temperature *** predict that the leading superconducting pairing instability is driven from an extended s-wave(s^(±))to a d-wave by hole doping,e.g.,in Ba_(1-x) K_(x) Co_(2)N_(2).This study provides a new platform to establish the superconducting mechanism of unconventional high-temperature superconductivity.

关键词： superconductivity satis cobalt