能力构型、交易成本与治理模式的协同演化——一个内生性全球价值链治理模式的分析框架

文章运用协同演化的分析思想,基于企业组织层面及地理空间层面能力构型、交易成本与治理机制之间的内在互动关系,构造了一个内生性全球价值链治理模式的分析框架。通过它可以有效地弥补和完善全球价值链分析范式的局限,同时有助于更为深入地理解国际化进程中发展中国家当地集群升级的内在逻辑。

中国数字文化出海与软实力构建

数字文化出海已构成我国国际传播“拓体系”的重要方向。从系统性、过程性与多样性视角出发,本文对游戏电竞、在线影视、网络文学、网络动漫、网络音乐、短视频这六大领域的出海态势与能力构型作出比较分析。本文认为,在数字文化的产业化生产与流通仍然受美国媒体巨头引导的全球语境下,中国互联网产业以沉浸式、虚拟化媒介技术的新发展为契机,积极锻造新的传播空间与媒介业态,并在内容产制、平台制播一体化、在地可沟通性等维度上实现国际传播能力的立体化拓展,初步实现了多元竞争性的数字文化软实力。

三维CAD辅助工程制图教学的方法

针对工程制图投影理论学习中学生空间想象力与空间逻辑思维能力不强的问题,将三维CAD造型技术适时地引入到教学内容中。作为一个新的教学理念,采用现代化的教学手段,用三维CAD造型技术辅助工程制图教学,帮助学生实现"平面-空间-平面"这一过程的思维转换,即由平面视图想象三维空间形体的形状再将形体通过视图形式来图解表达。实践证明,三维CAD与工程制图的有机融合可以提高学生的空间想象力与构型能力,并能培养图学意识。

浅析三维CAD辅助工程制图教学的方法

工程制图教学中不断暴露出学生空间逻辑思维能力不强的问题,大多数学生的空间想象力都无法适应工程制图的学习要求,将三维CAD造型技术引入到工程制图教学中可以有效解决上述问题。三维CAD造型技术不仅可以作为一种创新教学理念发生作用,同时也可以利用现代化的教学技术帮助学生实现"平面——空间——平面"的思维转换,对提高学生在工程制图教学中的空间想象力与构型能力有着重要作用。本文就三维CAD辅助工程制图教学的具体实践进行讨论。

Response Ability to External Signal Enhanced by Biological Spatial Configuration in Coupled Hindmarsh-Rose Neural System

The effect of realistic topology configuration of intercellular connections on the response ability in coupled cell system is numerically investigated by using the Hindmarsh-Rose model. For the proper coupling intensity, we set the control parameter to be near the critical value, and the external stimulus is introduced to the first cell in coupled system. It is found that, on one hand, when the cells are coupled with some proper topological structures, the external stimulus could transmit through the system, and shows better response ability and higher sensitivity. On the other hand, the influence of topological configuration on the synchronous ability and selection effect of neural system are also discussed. Our results display that the topology of coupled system may play an important role in the process of signal propagation, which could help us to understand the coordinated performance of cells in tissue.

Variable-based Ramberg-Osgood constitutive model of power spinning bushing

The influences of power spinning process parameters on the mechanical properties of spinning parts were analyzed with an SXD100/3-CNC numerical control power spinning machine.The unidirectional tensile tests were carried out.Based on the experimental data,a ternary quadratic regression equation was established by orthogonal experiment.The Ramberg-Osgood constitutive model of tin-bronze connecting rod bushing was obtained.Referred to the constitutive relation of macroscopic incremental,the incremental elastoplastic constitutive relation of spinning parts was deduced based on the Mises yield criterion and kinematic hardening model.The results can be applied to the elastoplastic analysis in finite element numerical simulation.

Microstructure and mechanical properties of Mg-Gd-Y-Zr alloy cast by metal mould and lost foam casting

The microstructure and mechanical properties of Mg-10.1Gd-3.74Y-0.25Zr （mass fraction, %） alloy （GW104 alloy） cast by metal mould casting （MMC） and lost foam casting （LFC） were evaluated, respectively. It is revealed that different forming modes do not influence the phase composition of as-cast alloy. In the as-cast specimens, the microstructures are similar and composed of α-Mg solid solution, eutectic compound of α-Mg＋Mg 24 （Gd, Y） 5 and cuboid-shaped Mg 5 （Gd, Y） phase; whereas the average grain size of the alloy produced by metal mould casting is smaller than that by lost foam casting. The eutectic compound of the alloy is completely dissolved after solution treatment at 525 ℃for 6 h, while the Mg 5 （Gd, Y） phase still exists after solution treatment. After peak-ageing, the lost foam cast alloy exhibits the maximum ultimate tensile strength of 285 MPa, and metal mould cast specimen 325 MPa at room temperature, while the tensile yield strengths of them are comparable. It can be concluded that GW104 alloy cast by lost foam casting possesses similar microstructure and evidently lower mechanical strength compared with metal mould cast alloy, due to slow solidification rate and proneness to form shrinkage porosities during lost foam casting process.

Molecular Dynamics Study on Configuration Energy and Radial Distribution Functions of Ammonium Dihydrogen Phosphates Solution

Molecular dynamics simulations were carried out to study the configuration energy and radial distribution functions of mmonium dihydrogen phosphate solution at different temperatures. The dihydrogen phosphate ion was treated as a seven-site model and the ammonium ion was regarded as a five-site model, while a simple-point-charge model for water molecule. An unusually local particle number density fluctuation was observed in the system at saturation temperature. It can be found that the potential energy increases slowly with the temperature from 373 K to 404 K, which indicates that the ammonium dihydrogen phosphate has partly decomposed. The radial distribution function between the hydrogen atom of ammonium cation and the oxygen atom of dihydrogen phosphate ion at three different temperatures shows obvious difference, which indicates that the average H-bond number changes obviously with the temperature. The temperature has an influence on the combination between hydrogen atoms and phosphorus atoms of dihydrogen phosphate ion and there are much more growth units at saturated solutions.

三维CAD辅助工程制图教学的方法

在开展工程制图教学时,学生逻辑能力与空间思维能力较弱的问题明显的暴露出来。部分学生的想象力均难以达到工程制图的基础要求,为教学增添了一定的难度。而三维CAD技术便可有效解决这一教学问题,在进行制图教学的过程中引入造型技术即可。三维CAD技术的出现不仅为创新教学提供一定的技术支撑,同时发挥着一定的积极作用,借助现代教学技术将教学内容进行完整的展现,帮助学生实现思维转换,达到平面与空间之间自由切换的最终效果。有效提升学生的个人想象力,增强学生的构型能力,提高工程制图教学质量。本文将浅要阐述应用三维CAD开展制图教学的重要作用,分析其教学方法,继而提出三维CAD与工程制图教学的具体应用并开展一系列的研讨。

First-principles investigations of structural, mechanical, electronic and optical properties of U_3Si_2-type AlSc_2Si_2 under high pressure

The structural, elastic, electronic and optical properties for U3Si2-type AlSc2Si2 compound under pressure were systematically investigated by using the first-principles calculations. The values of elastic constants and elastic moduli indicate that AlSc2Si2 keeps mechanical stability under high pressure. The mechanical properties of AISc2Si2 are compared with those of Al3Sc. The results indicate that AlSc2Si2 is harder than AI3Sc. Anisotropic constant AU and 3D curved surface of elastic moduli predict that AISc2Si2 is obviously anisotropic under pressure. The electronic structure of AlSc2Si2 exhibits metallic character and the metallicity decreases with the elevated pressure. In addition, optical properties as a function of pressure were calculated and analyzed. The present work provides theoretical support for further experimental work and industrial applications.

Performances of Five Representative Force Fields on Gaseous Amino Acids with Different Termini

There is a growing interest in the study of structures and properties of biomolecules in gas phase. Applications of force fields are highly desirable for the computational efficiency of the gas phase study. To help the selection of force fields, the performances of five repre- sentative force fields for gaseous neutral, protonated, deprotonated and capped amino acids are systematically examined and compared. The tested properties include relative conforma- tional energies, energy differences between cis and trans structures, the number and strength of predicted hydrogen bonds, and the quality of the optimized structures. The results of BHandHLYP/6-311＋＋G（d,p） are used as the references. GROMOS53A6 and ENCADS are found to perform poorly for gaseous biomoleeules, while the performance of AMBER99SB, CHARMM27 and OPLSAA/L are comparable when applicable. Considering the general availability of the force field parameters, CHARMM27 is the most recommended, followed by OPLSAA/L, for the study of biomolecules in gas phase

Improving cam profile design optimization based on classical splines and dynamic model

Cam profiles play an important part in the performance of cam mechanisms. Syntheses of cam profile designs and dynamics of cam designs are studied at first. Then, a cam profile design optimization model based on the six order classical spline and single DOF(degree of freedom) dynamic model of single-dwell cam mechanisms is developed. And dynamic constraints such as jumps and vibrations of followers are considered. This optimization model, with many advantages such as universalities of applications, conveniences to operations and good performances in improving kinematic and dynamic properties of cam mechanisms, is good except for the discontinuity of jerks at the end knots of cam profiles which will cause vibrations of cam systems. However, the optimization is improved by combining the six order classical spline with general polynomial spline which is the so-called "trade-offs". Finally, improved optimization is proven to have a better performance in designing cam profiles.

Concept and evaluation method of equipment system of systems contribution rate

To scientifically evaluate the equipment system of systems(SoS)contribution rate,a contribution rate calculation method based on a structural equation model(SEM)is proposed in this paper.The connotation and evaluation process of the equipment SoS contribution rate were redefined and standardized.To solve the existing problems in the application of the original contribution rate formula,a modified contribution rate calculation formula is proposed.Finally,the contribution rate evaluation index was divided into latent and explicit variables.The measurement and structural equations in the SEM were used to calculate and analyze the latent variables.The simulation results show that the number of defense lines of air defense weapon equipment has a greater impact on the linear configuration than the group configuration.When the number of K-type air defense weapons is sufficient,the two-layer linear configuration should be adopted with 20 air defense weapon systems.When the number of K-type air defense weapons is insufficient,the single-layer group configuration should be adopted with 12 air defense weapon systems.

Compression behavior and constitutive model establishment of fly ash cenosphere/polyurethane aluminum alloy syntactic foam

The aluminum matrix syntactic foam was fabricated by pressure infiltration technique,and the filling material is syntactic foam material with fly ash cenosphere as the main component and polyurethane foam as the binder.Split Hopkinson pressure bar(SHPB)dynamic compression and quasi-static tests were carried out to examine the compressive response of syntactic foam in this study.Then the dynamic constitutive model was established.Results show that the compressive stress-strain curve of syntactic aluminum foam is similar to that of other metallic foam materials:both kinds of aluminum matrix syntactic foams have strain rate effect,and the syntactic foam has higher compressive strength and energy absorption than the same density aluminum foams.However,due to the different sizes of cenospheres,the dynamic compression results of two kinds of syntactic foams are different,and the energy absorption effect of syntactic foam with small size under dynamic impact is the best.In the range of strain rate and density studied experimentally,the curves of constitutive model fit well with the curves of experimental data.

Genetic Function Approximation Based QSPR Models for Predicting the Wetting Ability of Lubricants onto Rolled Copper Foil Surface

The contact angle phenomena and wetting behavior of fatty acids,alcohols and ester used as additives in lubricants onto the rolled copper foil(RCF)surface were studied by the static sessile drop method.Semi-empirical quantum-chemical method studies on the contact angle of these compounds onto surface using several structural parameters were carried out.Molecular refractivity as well as several structural parameters were adopted in the development of quantitative structure-property relationships(QSPR)using genetic function approximation(GFA)statistical analysis method.The results show that quantum parameters are a better choice when predicting the contact angle and wettability of lubricants onto the RCF surface.Contact angle of the compounds serves as a function of their viscosity,interfacial tension,and physicochemical parameters.Alog P,molecular refractivity,molecular flexibility,total molecular mass,solvent surface area,element count,total energy and dipole are the most sensitive ones among the major contributing parameters.Notably,studies of lubricants on the RCF surfaces allow wetting theories to be tested down to the microcosmic scale,which can bring about new insight to predict wettability of lubricants onto RCF surface.

How Should We Construct Mind-Readers？

Structured models of kinds of mind-readers are explanatory tools in philosophy and psychology. Structure means that a structure like a theory with certain properties organizes the model of a kind of a reader. Structured models serve to explain mind-reading capabilities in opposition to pure behavior-reading capabilities by explicating properties of the structure that bring on specific capabilities of mind-reading. Typically, grades of fulfilling reading-capabilities are related to grades of rationality. But it is unclear： （1） when we are legitimated to title a reader a mind-reader or behavior-reader, and （2） how the kinds of readers are related with each other （if they can be related by a measure）. I argue that we know a reader if we can construct it and this gives legitimation. But it is unclear how to construct border-cases of readers, for example, minimal mind-readers. Should minimal mind-readers be constructed on the base of ＂reduced＂ mind-readers, or should they be constructed as ＂enriched＂ behavior-readers？ This is the specific question concerning the relations between readers the essay deals with by trying to reduce a maximal mind-reader by Craig-reduction. Because this kind of reduction-method fails, constructing specific kinds of mind-readers needs further research.

Numerical simulation investigations of energy-saving diffuser of main fan

Based on the boundary condition of field engineering, numerical simulations of28 conditions of existing diffusers of 3 structure types were investigated by ComputationalFluid Dynamics software package, and there were the problems of larger structure resistanceand lower diffusing efficiency of these diffusers by analysis of CFD results.Thestructure outlines of the energy-saving diffuser were constructed by the application ofstream function and potential function superimposing.On the basis of numerical simulationsof energy-saving diffusers of 5 area-enlarging ratios, structural resistances and diffusingefficiencies of 5 energy-saving diffusers were comparatively analyzed, and therange from 2.00 to 2.31 of the rational area-enlarging ratio of energy-saving diffusers wasderived.The optimization area-enlarging ratio of the energy-saving diffuser was presently2.28 through comparable analysis.From the above, the results show that the coefficient ofperformance of the energy-saving diffuser is better than 3 existing diffusers.

Eight-Regularity of Types of Crop Capacity Structure of Winter Wheat

The elements of crop capacity structure of 13 summer characteristics in 33 winter wheat varieties, qualitative three-regularity and quantitative eight-regularity are investigated through the application of systematic approach. The principle of triadness applied in a language, in a genetic code and other codes is used, i.e. the logic homology is employed. The purpose are （1） to show the use of a systematic approach to the analysis of elements of crop capacity structure of winter wheat; （2） to analyze efficiency, the years of harvests and winter hardiness; （3） to find the way of selection and varieties assessment in terms of the elements efficiency. The quantitative compatibility as the highest with the sign ＂＋＂ and the lowest with the sign ＂-＂ in terms of elements efficiency gives eight types of crop capacities. The type of crop capacity structure ＂＋＋＋＂ can serve as a full （higher） measure of a variety adaptableness and optimality of technologies. The triad of three characteristics as a type-＂＋＋＋＂ in which the first sign is the quantity of ears （QE）; the second is a quantity of grains （QG）; the third is the weight of grains （WG） creates the highest level of crop capacity.

Mechanical Behavior of Soybean Protein Fibers

In order to understand the relationship between the mechanical property and the effect of bleaching and dyeing to the soybean protein fibers(SPF),four mechanical models are chosen.The tensile and relaxation property of the soybean protein fibers are analyzed.The tensile and relaxation curves are fitted with the suitable model.It shows that the relaxation property of SPF is in accordance with the standard linear solid model.Estimates of the Hookean spring modulus at 8% and at 10% are different,so some structural modifications could be produced by the strain.Bleached fibers show a higher level of relaxation than raw fibers and dyed fibers.Bleaching has a remarkable influence on decreasing tenacity at break for each test modality.Knotted and looped modalities decrease fiber tenacity remarkably in all three samples.