基于midas Gen的单层球形网壳结构分析及应用研究

基于midas Gen软件模型,在不同应力比下对实体工程金属网壳模型进行分析,获得了工程实体金属网壳模型静力荷载下铸钢铰支座反力、罕遇地震时铸钢铰支座反力、静力荷载销轴反力、罕遇地震销轴反力分布情况。将设计模型得到的实体工程金属网壳荷载–位移曲线与有关设计模型网壳荷载–位移曲线进行对比,通过实体工程金属网壳模型设计实例,分析了不同应力下的杆件位移情况,从而证明了实体工程金属网壳模型设计的准确性及合理性。

TOEPLITZ OPERATORS WITH POSITIVE OPERATOR-VALUED SYMBOLS ON VECTOR-VALUED GENERALIZED FOCK SPACES

In this article,we study some characterizations of Toeplitz operators with positive operator-valued function as symbols on the vector-valued generalized Bargmann-Fock spaces Fψ^2.Main results including Fock-Carleson condition,bounded Toeplitz operators,compact Toeplitz operators,and Toeplitz operators in the Schatten-p class are all considered.

Algorithm of symbol generation and configuration of land polygons in present land-use map

The symbolization of land polygon is an important part of cartography. In the mapping of traditional present land-use maps, the symbol of land polygons was usually filled by the method of filling or plotting, but these methods can't solve the spatial conflicts of the symbol. According to the principle of cartography, the rule of how to symbolize the land polygon was summarized, and a new method that can generate and deploy the land symbols was presented. By making use of C# programming language and Arc Engine developing components, the algorithm can generate land symbols presenting triangle and adjust the coordinate of the symbol. Through mapping the present land-use map of Honghe county, this algorithm can reduce 88.84% of the spatial conflicts error rate compared with the traditional methods. It improves the accuracy and efficiency of the map symbolic.

Analysis of convergence for initial condition estimation of coupled map lattices based on symbolic dynamics

A novel approach to the inverse problem of diffusively coupled map lattices is systematically investigated by utilizing the symbolic vector dynamics. The relationship between the performance of initial condition estimation and the structural feature of dynamical system is proved theoretically. It is found that any point in a spatiotemporal coupled system is not necessary to converge to its initial value with respect to sufficient backward iteration, which is directly relevant to the coupling strength and local mapping function. When the convergence is met, the error bound in estimating the initial condition is proposed in a noiseless environment, which is determined by the dimension of attractors and metric entropy of the system. Simulation results further confirm the theoretic analysis, and prove that the presented method provides the important theory and experimental results for better analysing and characterizing the spatiotemporal complex behaviours in an actual system.

Symbolic generation of the kinematics of multibody systems in EasyDyn: From MuPAD to Xcas/Giac

In the EasyDyn multibody open source project, computer algebra has been used from the beginning to generate the expressions of velocities and accelerations of the bodies, by symbolic differentiation of their position. Originally, the MuPAD computer algebra system had been retained because it was freely available for non commercial purposes and showed very good technical features.Unfortunately, MuPAD is nowadays only available through commercial channels and needs to be replaced to keep EasyDyn publicly available. This paper presents why Xcas/Giac is finally selected,among other long-term promising projects like Axiom, Maxima, Sage or Yacas. Among the choice criteria, the accessibility, the portability, the ease of use, the automatic export to C language, and the similarity with the -MuPAD language are all considered. The performances of the MuPAD and Xcas/Giac implementations are also compared on some examples.C 2013 The Chinese Society of Theoretical and Applied Mechanics. [doi：10.1063/2.13013012]

COATES GRAPH APPROACH FOR GENERATING SYMBOLIC NETWORK FUNCTION

In this paper, symbolic code matrix ,constant matrix and count matrix are defined .The first twomatrices are used to describe the elemental expression of augmented matrix and the nede admittance equa-tion is thus obtained. The third matrix is used to obtain the incoming degree matrix, and according to thematrix all the 1- factors of the Coates graph are given. By using the data code, the determinant is expandedand the same items in the expansion are merged. Thus the symbolic network function in which no term can-cellation occurs is generated.

Detection of Turbulence Anomalies Using a Symbolic Classifier Algorithm in Airborne Quick Access Record(QAR)Data Analysis

As the risks associated with air turbulence are intensified by climate change and the growth of the aviation industry,it has become imperative to monitor and mitigate these threats to ensure civil aviation safety.The eddy dissipation rate(EDR)has been established as the standard metric for quantifying turbulence in civil aviation.This study aims to explore a universally applicable symbolic classification approach based on genetic programming to detect turbulence anomalies using quick access recorder(QAR)data.The detection of atmospheric turbulence is approached as an anomaly detection problem.Comparative evaluations demonstrate that this approach performs on par with direct EDR calculation methods in identifying turbulence events.Moreover,comparisons with alternative machine learning techniques indicate that the proposed technique is the optimal methodology currently available.In summary,the use of symbolic classification via genetic programming enables accurate turbulence detection from QAR data,comparable to that with established EDR approaches and surpassing that achieved with machine learning algorithms.This finding highlights the potential of integrating symbolic classifiers into turbulence monitoring systems to enhance civil aviation safety amidst rising environmental and operational hazards.

Improved Genetic Programming Algorithm Applied to Symbolic Regression and Software Reliability Modeling

The present study aims at improving the ability of the canonical genetic programming algorithm to solve problems, and describes an improved genetic programming (IGP). The proposed method can be described as follows: the first inves-tigates initializing population, the second investigates reproduction operator, the third investigates crossover operator, and the fourth investigates mutation operation. The IGP is examined in two domains and the results suggest that the IGP is more effective and more efficient than the canonical one applied in different domains.

Darboux Transformation and Soliton Solutions for Inhomogeneous Coupled Nonlinear Schr(o|¨)dinger Equations with Symbolic Computation

With the aid of computation, we consider the variable-coefficient coupled nonlinear Schrodinger equations with the effects of group-velocity dispersion, self-phase modulation and cross-phase modulation, which have potential applications in the long-distance communication of two-pulse propagation in inhomogeneous optical fibers. Based on the obtained nonisospectral linear eigenvalue problems （i.e. Lax pair）, we construct the Darboux transformation for such a model to derive the optical soliton solutions. In addition, through the one- and two-soliton-like solutions, we graphically discuss the features of picosecond solitons in inhomogeneous optical fibers.

SEGA MD模拟器Gens Plus难点教程

此次笔者介绍给大家的，是一个叫Gens Plus的SEG AMD模拟器，它实际上是Gens的修改版，Gens这个元老级的MD模拟器曾是不少玩家的首选，但在实现了SEGA MD、SEGA CD和SEGA 32X的模拟后，Gens便沉寂了下来，直至Gens Plus的出现。

The Symbolic Meaning of the African Indigenous Animals in The Snows of Kilimanjaro

This paper re-appreciates this famous short story by combining the symbol studies and the cultural studies,especially trying to find the theme of the story by analyzing the African indigenous animal symbols in the story.This analysis of the symbol ic meaning of the African indigenous animal symbols tries to prove that the theme of the story is not only the death but also the theme of anti-imperialism.This analysis of the African indigenous animal symbols helps convey Hemingway's feelings and thoughts of anti-imperialism and inspire people's awareness of anti-imperialism during the 1920s-1930s.

Lucas Symbolic Formulae and Generating Functions for Chebyshev Polynomials

This work shows that each kind of Chebyshev polynomials may be calculated from a symbolic formula similar to the Lucas formula for Bernoulli polynomials. It exposes also a new approach for obtaining generating functions of them by operator calculus built from the derivative and the positional operators.

Approximately Bi-Similar Symbolic Model for Discretetime Interconnected Switched System

Dear Editor,This letter concerns the development of approximately bi-similar symbolic models for a discrete-time interconnected switched system(DT-ISS).The DT-ISS under consideration is formed by connecting multiple switched systems known as component switched systems(CSSs).Although the problem of constructing approximately bi-similar symbolic models for DT-ISS has been addressed in some literature,the previous works have relied on the assumption that all the subsystems of CSSs are incrementally input-state stable.

A Study on the Symbol-Based Narrative in the International Communication of Cities

Cultural symbols,a manifestation of cities’cultural resources,are not only signs that frame concepts but also forms that express meanings.Exploring the international communication of cities from the perspective of symbols,this paper analyzes in depth how cities create their cultural symbols in the dynamic process of international communication in an era of symbol-based digital media,and how they develop their narratives and explain meanings through the dissemination of symbols when telling their stories to international audiences,thus enhancing the efficiency and effectiveness of their international communication efforts.

药物检测机构营销策略研究——以GEN公司为例

当下处于经济迅速复苏的后疫情时代,政府及人民对于药物安全性提出了更高要求,而当前市场中存在大量的药物公司,其运营过程中需要药物检测企业的深度参与。随着药品研发环境的不断发展变化,药物检测机构作为新兴的社会力量在社会活动中的角色越来越重要。文章基于案例实证分析的研究思路,以GEN公司为研究对象,客观分析其所面对的宏观及微观环境,明晰当下的可利用优势及市场机遇,制定合理可行的实施计划及相适应的职能策略。文章的主要研究目标是通过对GEN公司自身运营资源、技术能力、市场环境等情况的剖析,充分发挥自身优势,有效规避市场风险,建立健全企业管理体系,优化内部运行机制,为企业的运营管理充分赋能,提升药物检测企业的核心竞争能力,助力企业实现高质量经营发展。目前,我国药物检测认证企业尚处于高速发展阶段,GEN公司当前所面临的问题具有一定的代表性,文章研究讨论的意见及观点既能对GEN公司的经营管理产生有效促进作用,亦对药物市场上的多数同质公司有一定的参考借鉴意义。

基于BIM的Midas Gen钢结构有限元分析

目前,BIM模型参与有限元分析的实际案例相对较少,因此,急需解决通过结合BIM和有限元分析进行应用的问题。本文主要基于BIM和Midas Gen对钢结构设计安全性能进行有限元分析研究,首先,通过对本工程钢结构的材料进行构件属性定义;其次,使用BIM软件Revit将兼职建筑信息模型导入Midas Gen,根据实际工程条件定义设计参数,并说明结构的荷载定义及边界条件;再次,通过有限元软件Midas Gen分别对钢结构进行静力分析和动力分析,获取结构的应力和变形结果;最后,得出结构最大应力为192.4 MPa,最大位移数值为14.8 mm,均满足规范要求。

Midas Gen在输水工程水池结构计算中的应用

为解决输水工程大型水池结构计算适用性问题,结合工程实例,采用通用有限元软件Midas Gen对某工程高位水池进行有限元分析,建立高位水池整体分析模型,得到高位水池在各种荷载工况及荷载组合下的变形及内力分布结果。针对水池不同部位,分析其水平向和竖直向弯矩,得出弯矩分布规律,用以进行针对性配筋设计。同时,内力结果不至过大,说明高位水池立柱和梁形成的纵、横向框架结构增强了水池的整体性和受力性能,结构体系是合理的。该计算实例可为类似工程设计提供参考。

Symbols in The Magic Barrel

The article takes the famous modern American Jewish writer Bernard Malamud’s novel The Magic Barrel as the object of study,and uses symbolism to interpret it,analyzing it one by one in terms of the magic barrel,the colors,the seasons and the windows,respectively,so as to reveal the process of getting rid of the childishness within the novel’s male protagonist,Leo Finkel,who is maturing,as well as the novel’s Jewish theme of searching for the soul of the self.