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聚焦“专业岗位职务能力”背景下的课程改革与实践——以“建筑结构基础与钢筋算量”课程为例 被引量:1
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作者 朱冬飞 黄翰 +1 位作者 张军委 尧国皇 《广东交通职业技术学院学报》 2021年第1期99-102,106,共5页
建筑结构识图和钢筋算量是高职土建类专业学生的核心技能之一。通过聚焦"专业岗位职务能力",对课程重新定位,结合工作岗位任务进行教学内容选取并实施综合考核方式,使学生的知识技能更加贴合专业岗位需求,并实现学生学习热情... 建筑结构识图和钢筋算量是高职土建类专业学生的核心技能之一。通过聚焦"专业岗位职务能力",对课程重新定位,结合工作岗位任务进行教学内容选取并实施综合考核方式,使学生的知识技能更加贴合专业岗位需求,并实现学生学习热情的长效性,让学生更加适应市场需求,取得了较好的教学效果。 展开更多
关键词 专业岗位职务能力 结构识图与钢筋 课程改革 教学模式 教学方法 高职教育
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大跨连体超限高层建筑结构设计研究 被引量:3
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作者 王彩雪 《城市住宅》 2021年第8期165-166,共2页
为解决传统大跨连体超限高层建筑结构基底承载力低的问题,通过建立大跨连体超限高层建筑结构抗力时变模型,计算大跨连体超限高层建筑结构算量,并与抗力时变模型相关联,在此基础上分析大跨连体超限高层建筑结构抗震性,通过限定不同结构... 为解决传统大跨连体超限高层建筑结构基底承载力低的问题,通过建立大跨连体超限高层建筑结构抗力时变模型,计算大跨连体超限高层建筑结构算量,并与抗力时变模型相关联,在此基础上分析大跨连体超限高层建筑结构抗震性,通过限定不同结构混凝土的保护层厚度,完成大跨连体超限高层建筑结构设计。通过设计实例分析,表明设计建筑结构基底承载力更高,能解决传统大跨连体超限高层建筑结构基底承载力低的问题。 展开更多
关键词 高层建筑 建筑结构 大跨连体超限高层建筑 结构设计 抗力 结构算量 基地承载力 抗震性
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Syntheses,crystal structures,and quantum chemistry calculation of two Ni(Ⅱ)coordination polymers
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作者 LI Xiumei HUANG Yanju +1 位作者 LIU Bo PAN Yaru 《无机化学学报》 SCIE CAS CSCD 北大核心 2024年第10期2031-2039,共9页
Two new coordination polymers,[Ni(Hpdc)(bib)(H_(2)O)]_(n)(1)and{[Ni(bib)_(3)](ClO_(4))_(2)}_(n)(2),were prepared by mixing Ni^(2+),3,5⁃pyrazoledicarboxylic acid(H3pdc)/p⁃nitrobenzoic acid and 1,4⁃bis(imidazol⁃1⁃ylmeth... Two new coordination polymers,[Ni(Hpdc)(bib)(H_(2)O)]_(n)(1)and{[Ni(bib)_(3)](ClO_(4))_(2)}_(n)(2),were prepared by mixing Ni^(2+),3,5⁃pyrazoledicarboxylic acid(H3pdc)/p⁃nitrobenzoic acid and 1,4⁃bis(imidazol⁃1⁃ylmethyl)butane(bib)by a hydrothermal method,respectively.X⁃ray crystallography reveals a 2D network constructed by six⁃coordinated Ni(Ⅱ)centers,bib,and Hpdc2-ligands in complex 1,while a 2D network is built by Ni(Ⅱ)and bib ligands in 2.Furthermore,the quantum⁃chemical calculations have been performed on‘molecular fragments’extracted from the crystal structure of 1 using the PBE0/LANL2DZ method in Gaussian 16 and the VASP program.CCDC:2343794,1;2343798,2. 展开更多
关键词 coordination polymer nickel(Ⅱ)complex crystal structure quantum⁃chemical calculation
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Cryptanalysis of Cryptosystems Based on General Linear Group 被引量:1
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作者 Jianwei Jia Jinhui Liu Huanguo Zhang 《China Communications》 SCIE CSCD 2016年第6期217-224,共8页
Advances in quantum computers threaten to break public key cryptosystems such as RSA, ECC, and EIGamal on the hardness of factoring or taking a discrete logarithm, while no quantum algorithms are found to solve certai... Advances in quantum computers threaten to break public key cryptosystems such as RSA, ECC, and EIGamal on the hardness of factoring or taking a discrete logarithm, while no quantum algorithms are found to solve certain mathematical problems on non-commutative algebraic structures until now. In this background, Majid Khan et al.proposed two novel public-key encryption schemes based on large abelian subgroup of general linear group over a residue ring. In this paper we show that the two schemes are not secure. We present that they are vulnerable to a structural attack and that, it only requires polynomial time complexity to retrieve the message from associated public keys respectively. Then we conduct a detailed analysis on attack methods and show corresponding algorithmic description and efficiency analysis respectively. After that, we propose an improvement assisted to enhance Majid Khan's scheme. In addition, we discuss possible lines of future work. 展开更多
关键词 CRYPTOGRAPHY post quantum computational cryptography CRYPTANALYSIS non-abelian algebraic structures linear equations
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On modal energy in civil structural control
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作者 Miao PANG Tie-jiong LOU Ming ZHAO 《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》 SCIE EI CAS CSCD 2008年第7期878-887,共10页
A new control strategy based on modal energy criterion is proposed to demonstrate the effectiveness of the control system in reducing structural earthquake responses. The modal control algorithm combining LQR(linear q... A new control strategy based on modal energy criterion is proposed to demonstrate the effectiveness of the control system in reducing structural earthquake responses. The modal control algorithm combining LQR(linear quadratic regulator) control algorithm is adopted in the discrete time-history analysis. The various modal energy forms are derived by definition of the generalized absolute displacement vector. A preliminary numerical study of the effectiveness of this control strategy is carried out on a 20-storey framed steel structural model. The controlled performance of the model is studied from the perspectives of both response and modal energy. Results show that the modal energy-based control strategy is very effective in reducing structural responses as well as in consuming a large amount of modal energy,while augmentation of additional generalized control force corresponding to the modes that contain little modal energy is unnecessary,as it does little help to improve the controlled structural performance. 展开更多
关键词 Modal energy Aseismic control LQR (linear quadratic regulator) control algorithm Modal space Generalized single-degree-of-freedom (SDOF) system
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Document Clustering Based on Constructing Density Tree
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作者 戴维迪 王文俊 +2 位作者 侯越先 王英 张璐 《Transactions of Tianjin University》 EI CAS 2008年第1期21-26,共6页
This paper focuses on document clustering by clustering algorithm based on a DEnsityTree (CABDET) to improve the accuracy of clustering. The CABDET method constructs a density-based treestructure for every potential c... This paper focuses on document clustering by clustering algorithm based on a DEnsityTree (CABDET) to improve the accuracy of clustering. The CABDET method constructs a density-based treestructure for every potential cluster by dynamically adjusting the radius of neighborhood according to local density. It avoids density-based spatial clustering of applications with noise (DBSCAN) ′s global density parameters and reduces input parameters to one. The results of experiment on real document show that CABDET achieves better accuracy of clustering than DBSCAN method. The CABDET algorithm obtains the max F-measure value 0.347 with the root node's radius of neighborhood 0.80, which is higher than 0.332 of DBSCAN with the radius of neighborhood 0.65 and the minimum number of objects 6. 展开更多
关键词 document handling clustering tree structure vector space model
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Structural Evolution and Electronic Properties of Au2Gen-/0(n=1-8) Clusters: Anion Photoelectron Spectroscopy and Theoretical Calculations
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作者 Sheng-Jie Lu Hong-Guang Xu +1 位作者 Xi-Ling Xu Wei-Jun Zheng 《Chinese Journal of Chemical Physics》 SCIE CAS CSCD 2019年第2期229-240,I0003,共13页
Investigating the structures and properties of Au-Ge mixed clusters can give insight into the microscopic mechanisms in gold-catalyzed Ge films and can also provide valuable information for the production of germanium... Investigating the structures and properties of Au-Ge mixed clusters can give insight into the microscopic mechanisms in gold-catalyzed Ge films and can also provide valuable information for the production of germanium-based functional materials. In this work, size-selected anion photoelectron spectroscopy and theoretical calculations were used to explore the structural evolution and electronic properties of Au2Gen^-/0 (n=1-8) clusters. It is found that the two Au atoms in Au2Gen^-/0 (n=1-8) showed high coordination numbers and weak aurophilic interactions. The global minima of Au2Gen- anions and Au2Gen neutrals are in spin doublet and singlet states, respectively. Au2Gen- anions and Au2Gen neutrals showed similar structural features, except for Au2Ge4^-/0 and Au2Ge5^-/0. The C2v symmetric V-shaped structure is observed for Au2Ge1^-/0, while Au2Ge2^-/0 has a C2v symmetric dibridged structure. Au2Ge3^-/0 can be viewed as the two Au atoms attached to different Ge-Ge bonds of Ge3 triangle. Au2Ge4- has two Au atoms edge-capping Ge4 tetrahedron, while Au2Ge4 neutral adopts a C2v symmetric double Au atoms face-capping Ge4 rhombus. Au2Ge5-8^-/0 show triangular, tetragonal, and pentagonal prism-based geometries. Au2Ge6 adopts a C2v symmetric tetragonal prism structure and exhibits σ plus π double bonding characters. 展开更多
关键词 Photoelectron spectroscopy Transition metal Germanium cluster Structural evolution Quantum chemical calculations
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Chemical Dynamics Simulations of the Hydroxyl Radical Reaction with Ethene
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作者 Jiaxu Zhang Li Yang Diego Troya 《Chinese Journal of Chemical Physics》 SCIE CAS CSCD 2013年第6期765-773,I0005,共10页
We present a theoretical study of the reaction of the hydroxyl radical with ethene using electronic structure calculations and direct-dynamics simulations. High-accuracy electronic structure calculations at the CCSD(... We present a theoretical study of the reaction of the hydroxyl radical with ethene using electronic structure calculations and direct-dynamics simulations. High-accuracy electronic structure calculations at the CCSD(T)/aug-cc-pVTZ//MP2/aug-ce-pVDZ level have been carried out to characterize the representative regions of the potential energy surface of various reaction pathways, including OH-addition and H-abstraction. These ab initio calculations have been employed to derive an improved set of parameters for the MSINDO semiempirieal Hamiltonian specific to the OH+C2H4 reaction. The specific-reaction-parameter Hamilto- nian captures the ab initio data accurately, and has been used to perform direct quasiclassica] trajectory simulations of the OH+C2H4 reaction at collision energies in the range of 2-10 kcal/mol. The calculated cross sections reveal that the OH-addition reaction domi- nates at all energies over H-abstraction. In addition, the excitation function of addition is reminiscent of a barrierless capture process, while that for abstraction corresponds to an activated one, and these trends can be connected to the transition-state energies of both reactions. We note that the development of an accurate semiempirical Hamiltonian for the OH+C2H4 reaction in this work required the inclusion of empirical dispersion corrections, which will be important in future applications for which long-range intermoleeular attraction becomes significant. 展开更多
关键词 QCT SRP Hamiltonian MSIND0 HYDROXYL ETHENE
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The rough representation and measurement of quotient structure in algebraic quotient space model 被引量:5
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作者 陈林书 Wang Jiayang 《High Technology Letters》 EI CAS 2017年第3期293-297,共5页
Granular computing is a very hot research field in recent years. In our previous work an algebraic quotient space model was proposed,where the quotient structure could not be deduced if the granulation was based on an... Granular computing is a very hot research field in recent years. In our previous work an algebraic quotient space model was proposed,where the quotient structure could not be deduced if the granulation was based on an equivalence relation. In this paper,definitions were given and formulas of the lower quotient congruence and upper quotient congruence were calculated to roughly represent the quotient structure. Then the accuracy and roughness were defined to measure the quotient structure in quantification. Finally,a numerical example was given to demonstrate that the rough representation and measuring methods are efficient and applicable. The work has greatly enriched the algebraic quotient space model and granular computing theory. 展开更多
关键词 granular computing algebraic quotient space model quotient structure upper(lower) congruence relation
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LUCA:Lightweight Ubiquitous Computing Architecture
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作者 孙道清 曹奇英 《Journal of Donghua University(English Edition)》 EI CAS 2009年第3期300-308,共9页
Lightweight ubiquitous computing security architecture was presented. Lots of our recent researches have been integrated in this architecture. And the main current researches in the related area have also been absorbe... Lightweight ubiquitous computing security architecture was presented. Lots of our recent researches have been integrated in this architecture. And the main current researches in the related area have also been absorbed. The main attention of this paper was providing a compact and realizable method to apply ubiquitous computing into our daily lives under sufficient secure guarantee. At last,the personal intelligent assistant system was presented to show that this architecture was a suitable and realizable security mechanism in solving the ubiquitous computing problems. 展开更多
关键词 ubiquitous computing ARCHITECTURE TRUST AWARENESS privacy protection SECURITY
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Service optimization in programmable cloud network 被引量:1
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作者 丁浩 Yang Yang Mi Zhenqiang 《High Technology Letters》 EI CAS 2015年第4期485-493,共9页
With the rapid development in cloud data centers and cloud service customers,the demand for high quality cloud service has been grown rapidly.To face this reality,this paper focuses on service optimization issues in c... With the rapid development in cloud data centers and cloud service customers,the demand for high quality cloud service has been grown rapidly.To face this reality,this paper focuses on service optimization issues in cloud computing environment.First,a service-oriented architecture is proposed and programmable network facilities are utilized in it to optimize specific cloud services.Then various cloud services are categorized into two subcategories;static services and dynamic services.Furthermore,the concepts of cloud service quality and cloud resource idle rate are defined,and the aforementioned concepts have also been taken into consideration as parameters in the service optimization algorithm to improve the cloud service quality and optimize system workload simultaneously.Numerical simulations are conducted to verify the effectiveness of the proposed algorithm in balancing the workload of all servers. 展开更多
关键词 distributed cloud architecture programmable network cloud service quality LOADBALANCING
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Calculation of the Structural Parameters, and DOS of TaB2 with p6/mmm Space Group Using DFT
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作者 Maryam Masoudi Hamdolah Salehi 《Journal of Physical Science and Application》 2013年第6期374-379,共6页
In this paper, the structural parameters, and density of the states of TaB2 compound have been calculated, and investigated in hexagonal phase with P6/mmm space group. The calculations have been performed with ultra-s... In this paper, the structural parameters, and density of the states of TaB2 compound have been calculated, and investigated in hexagonal phase with P6/mmm space group. The calculations have been performed with ultra-soft pseudo-potential in the frame work of Density Functional Theory (DFT) by using the Quantum Espresso package. With respect to high quantity of bulk modulus, and low quantity of the volume it is being understood that this compound has a very hard structure. The figure of density of states shows that this compound is a kind of metal. The obtained results from this research have good accord with experimental results, and with the same researches. 展开更多
关键词 TAB2 DFT structural parameters density of states.
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Research on variable block size motion estimation algorithm for airborne image
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作者 王科 Huang Dongshan +1 位作者 Ma Li Zhang Yudong 《High Technology Letters》 EI CAS 2014年第3期321-327,共7页
A fast motion estimation algorithm for variable block-size using the "line scan and block merge procedure" is proposed for airborne image compression modules.Full hardware implementation via FPGA is discussed in det... A fast motion estimation algorithm for variable block-size using the "line scan and block merge procedure" is proposed for airborne image compression modules.Full hardware implementation via FPGA is discussed in detail.The proposed pipelined architecture based on the line scan algorithm is capable of calculating the required 41 motion vectors of various size blocks supported by H.264 within a 16 × 16 block in parallel.An adaptive rate distortion cost function is used for various size block decision.The motion vectors of adjacent small blocks are merged to predict the motion vectors of larger blocks for reducing computation.Experimental results show that our proposed method has lower computational complexity than full search algorithm with slight quality decrease and little bit rate increase.Due to the high real-time processing speed it can be easily realized in hardware. 展开更多
关键词 H.264 motion estimation line scan algorithm rate distortion optimization (RDO) FPGA block merge method
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First-principles calculation of the structure and the energy of ZrO_2/Al_2O_3 nanomultilayer 被引量:4
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作者 GAO Xue ZHANG Yue SHANG JiaXiang 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS 2011年第11期1990-1999,共10页
The electronic structure, atomic geometry and energetic properties of ceramic nanomultilayer have been systematically studied with first principles density functional theory calculations based on the generalized gradi... The electronic structure, atomic geometry and energetic properties of ceramic nanomultilayer have been systematically studied with first principles density functional theory calculations based on the generalized gradient approximations. It is found that the interface structure and adhesion, which determine the mechanical and thermal properties, are sensitive to the surface mor- phology. We also provide an analysis of adhesion of ZrO2/A1203 interface as a function of thickness of each layer. With the in- crease of ZrO2 thickness, both covalence and ionicity of the interfacial bonds are enhanced, which results in more strongly coupled interfaces while the ionic interaction decreases for thicker Al2O3 layers, which results in weakly coupled interfaces. A first-principles calculation method has been proposed to design nanomultilayer materials to achieve the demanded adhesion. 展开更多
关键词 nanomultilayer first principles INTERFACE
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