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Research on the Course of Principles of Concrete Structure Design
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作者 Yuhuan Shi Jinping Hu +2 位作者 Xue Lin Zhinan Jiang Jialian Qi 《Journal of Contemporary Educational Research》 2024年第2期80-84,共5页
Nowadays,education and teaching have become a hot topic,and teaching in colleges and universities is facing a brand-new development direction.Principles of Concrete Structure Design,as one of the main courses,transmit... Nowadays,education and teaching have become a hot topic,and teaching in colleges and universities is facing a brand-new development direction.Principles of Concrete Structure Design,as one of the main courses,transmits professional knowledge for students,enhances the students’professional ability,and further carries out in-depth research on the course to bring a better teaching effect for students.The article mainly focuses on the research of the principles of concrete structure design course,conducts an analysis of the teaching characteristics of the principles of concrete structure design course,and reasonably sets the teaching content from the optimization of the course teaching objectives;innovative course teaching methods can deepen the effect of knowledge understanding;reform of experimental practice teaching can lay down the effect of the internalization of knowledge,etc.The in-depth description and discussion of the relevant aspects of the research aim to provide guidelines for related research. 展开更多
关键词 Concrete structure design principle Course characteristics Teaching innovation Course research
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Theoretical calculations of structural, electronic, and elastic properties of CdSe_(1-x)Te_x:A first principles study
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作者 M Shakil Muhammad Zafar +3 位作者 Shabbir Ahmed Muhammad Raza-ur-rehman Hashmi M A Choudhary T Iqbal 《Chinese Physics B》 SCIE EI CAS CSCD 2016年第7期324-330,共7页
The plane wave pseudo-potential method was used to investigate the structural, electronic, and elastic properties of Cd Se_(1-x)Te_x in the zinc blende phase. It is observed that the electronic properties are improv... The plane wave pseudo-potential method was used to investigate the structural, electronic, and elastic properties of Cd Se_(1-x)Te_x in the zinc blende phase. It is observed that the electronic properties are improved considerably by using LDA + U as compared to the LDA approach. The calculated lattice constants and bulk moduli are also comparable to the experimental results. The cohesive energies for pure Cd Se and Cd Te binary and their mixed alloys are calculated. The second-order elastic constants are also calculated by the Lagrangian theory of elasticity. The elastic properties show that the studied material has a ductile nature. 展开更多
关键词 first principles calculations density functional theory II–VI semiconductors structural electronic and elastic properties
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Ground-State Structure and Physical Properties of NB_2 Predicted from First Principles
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作者 吴旌贺 刘长欣 《Chinese Physics Letters》 SCIE CAS CSCD 2016年第3期78-81,共4页
Using the newly developed particle swarm optimization algorithm on crystal structural prediction, we predict a new class of boron nitride with stoicMometry of NB2 at ambient pressure, which belongs to the tetragonal 1... Using the newly developed particle swarm optimization algorithm on crystal structural prediction, we predict a new class of boron nitride with stoicMometry of NB2 at ambient pressure, which belongs to the tetragonal 14m2 space group. Then, its structure, elastic properties, electronic structure, and chemical bonding are investigated by first-principles calculations with the density functional theory. The phonon calculation and elastic constants confirm that the predicted NB2 is dynamically and mechanically stable, respectively. The large bulk modulus, large shear modulus, large Young's modulus, and small Poisson's ratio show that the 14m2 NB2 should be a new superhard material with a calculated theoretical Vickers hardness value of 66 GPa. Further analysis on density of states and electron localization function demonstrate that the strong B B and 13 N covalent bonds are the main reason for its high hardness in 14m2 NB2. 展开更多
关键词 NB IS in of Ground-State Structure and Physical Properties of NB2 Predicted from First principles from
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Electronic Structure and Optical Properties in Uranium Dioxide:the First Principle Calculations
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作者 隋鹏飞 戴振宏 +1 位作者 张晓玲 赵银昌 《Chinese Physics Letters》 SCIE CAS CSCD 2015年第7期129-133,共5页
We report a study of the electronic structure and optical properties of uranium dioxide (U02) based on the ab-initio density-functional theory and using the generalized gradient approximation. To correctly describe ... We report a study of the electronic structure and optical properties of uranium dioxide (U02) based on the ab-initio density-functional theory and using the generalized gradient approximation. To correctly describe the strong correlation between 5 f electrons of a uranium atom, we employ the on-site Hubbard U correction term and optimize the correlation parameter of the bulk uranium dioxide. Then we give the structural and electronic properties of the ground state of uranium dioxide. Based on the accurate electronic structure, we calculate the complex dielectric function of UO2 and the related optieM properties, such as reflectivity, refractive index, extinction index, energy loss spectra, and absorption coefficient. 展开更多
关键词 LDA GGA Electronic Structure and Optical Properties in Uranium Dioxide:the First principle Calculations
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The Principle of Square Hole Machining and It's Tooling Structure Design
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作者 Jinxia NIU 《International Journal of Technology Management》 2015年第2期7-8,共2页
In order to meet the rapid needs of processing square hole in mechanical equipment, the paper expounds the square hole processing method: planetary wheel method, and analyze the principle of tooling structure and pro... In order to meet the rapid needs of processing square hole in mechanical equipment, the paper expounds the square hole processing method: planetary wheel method, and analyze the principle of tooling structure and process with computer graphics parameters design. The results that, as long as the appropriate parameters, using the above method not only can punch the square hole, can also be processed triangle, the five angle and hexagonal regular polygon holes. The square hole processing method can provide theoretical basis and engineering reliable reference for related engineering and technical personnel. 展开更多
关键词 Abstract: In order to meet the rapid needs of processing square hole in mechanical equipment the paper expounds the square hole processing method: planetary wheel method and analyze the principle of tooling structure and process with computer graphics parameters design. The results that as long as the appropriate parameters using the above method not only can punch the square hole can also be processed triangle the five angle and hexagonal regular polygon holes. The square hole processing method can provide theoretical basis and engineering reliable reference for related engineering and technical personnel. Keywords: Square hole processing Planet wheel Lelo triangle Square hole drilling
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THE THEORY OF STATIC DECAY IN COMPUTATIONAL MECHANICS
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作者 武建勋 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 1991年第4期345-354,共10页
In this paper, a new mathematical form, matrix, continued fraction (MCF) is introduced to describe the decay of effects of an equilibrant system of forces acting on a sphere of an elastic body. By this way, the famous... In this paper, a new mathematical form, matrix, continued fraction (MCF) is introduced to describe the decay of effects of an equilibrant system of forces acting on a sphere of an elastic body. By this way, the famous Saint-Venant's principle is proved often but not always valid in computational mechanics. 展开更多
关键词 matrix continued fraction static decay Saint-Venant's principle matrix structural analysis SUBSTRUCTURE superelement chain model
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First Principles Study of Structural Stability and Magnetic Property of Non-equilibrium Co–Mo Alloys
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作者 Shunning Li Baixin Liu Jianbo Liu 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2014年第6期1057-1062,共6页
First principles calculations are carried out to investigate the structural stability of several non-equilibrium intermetallic phases in the cobalt(Co)–Mo system using spin polarized projected augmented-wave potent... First principles calculations are carried out to investigate the structural stability of several non-equilibrium intermetallic phases in the cobalt(Co)–Mo system using spin polarized projected augmented-wave potentials. It is revealed that the Co3Mo, CoMo, and CoMo3 alloys are energetically favored to be in D019, B11, and A15 structures, respectively,and that the magnetic moments of Co atoms would decrease rapidly with an increasing percentage of Mo content and would most probably disappear when the content of Mo is no less than 50 at%. Generally, the calculated results in the present work match well with the available experimental observations. 展开更多
关键词 First principles calculation Transition metals Cobalt Magnetic property Electronic structure
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Formation Principles of Similar Systems 被引量:2
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作者 ZHOU Meili(Department of Mechanical Engineering, Anhui Institute of Technology 111 Lu An Rood, Hefei 230069, Anhui, People’s Republic of China) 《Systems Science and Systems Engineering》 CSCD 1996年第3期281-286,共6页
In this paper some new concepts, i.e, Ordered Structure of Systems, Universal Information, Strength of Information Field are proposed. Based on Similarity System Theory and Similology, five principles for investigatin... In this paper some new concepts, i.e, Ordered Structure of Systems, Universal Information, Strength of Information Field are proposed. Based on Similarity System Theory and Similology, five principles for investigating similarity formation, i.e., Principle of Ordered Structue, Information Principle, Consanguining Principle, Coadaptation Principle and Governing Principle are introduced. The origin of similar systems, and way of similarity formation are expounded. Thus, formation principles of similar systems is presented. 展开更多
关键词 similarity systems theory similology universal information information fetid principle of ordered structure information principle consanguinty principle coadaptation principle govering principle.
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