浅析楼顶高大模板支撑专项施工方案——以南宁市竹排冲1日泵房改扩建工程为例

文章以南宁市竹排冲旧泵房改扩建工程为例,通过对运行层梁板高大模板支撑进行受力计算与分析,并在实践中加以验证,保证了高大模板支撑体系的稳定与安全.     

Technology choice under duopoly

This paper presents a conjectural variation approach to demonstrate that competing firms will often distort their cost structures away from strict cost minimization for strategic reasons. In particular, it is shown that the nature of the desired distortions of production technology depends critically on the magnitudes of the firms' conjectural variations with respect to outputs as well as the firms' conjectural variations with respect to technology. These results are in sharp contrast to the conventional wisdom based on monopolized or perfectly competitive markets.     

Default models based on scale mixtures of Marshall-Olkin copulas: properties and applications

We present a unification of the Archimedean and the Lévy-frailty copula model for portfolio default models. The new default model exhibits a copula known as scale mixture of Marshall-Olkin copulas and an investigation of the dependence structure reveals that desirable properties of both original models are combined. This allows for a wider range of dependence patterns, while the analytical tractability is retained. Furthermore, simultaneous defaults and default clustering are incorporated. In addition, a hierarchical extension is presented which allows for a heterogeneous dependence structure. Finally, the model is applied to the pricing of CDO contracts. For this purpose, an efficient Laplace transform inversion approach is developed. Supporting a separation of marginal default probabilities and dependence structure, the model can be calibrated to CDS contracts in a first step. In a second step, the calibration of several parametric families to CDO contracts demonstrates a good fitting quality, which further emphasizes the suitability of the approach.     

Optimizing the capital rationing decision with uncertain returns

In this article, we develop a new optimization model for capital rationing with uncertain project returns. Our model maximizes the probability of meeting a predefined target return by selecting a feasible set of projects subject to budget constraints in multiple time periods. We employ a mixed-integer nonlinear algorithm recently developed in the optimization field to solve the resulting nonconvex optimization problem to optimality. Our model and solution methods are tested and validated through a comprehensive computational experiment. Several managerial insights are obtained about the impact of available budget and target return on the optimal solutions. Notably, we have found that increasing target return may not necessarily result in an increase in optimal total expected return of the selected projects. Our model and solution method offer a unified and computationally tractable approach to precisely quantify the tradeoff between project returned and risk.     

学生科研创新能力与应用型人才培养模式探析

为了培养具有创新精神和实践能力的人才,实验教学是重要环节,而科学研究是在实践、研究中锻炼人才;教学与科研是手段,培养人才和知识创新是目的,教学与科研相结合是高等教育实践成功的育人之道。通过课程体系与实验教学改革,充分发挥毕业论文与设计性实验的作用,发挥教师在实验教学与科研中的主导地位以及以重点学科为依托,组织学生申报科研项目等多方面的阐述,探讨了实验教学与科研在创新型人才培养模式中的现实作用和长远意义。     

Comparative Analysis of Ownership Transformation and Performance Relationship among Major and Regional Banks in Australia

This article attempts to clarify existing doubts with respect to the performance of private and privatised banks versus public banks; that is, it is an attempt to clarify the ownership–performance relationship. The analysis takes explicit account of the privatisation transformation, including its intermediary stage, and the status of the economy. The ownership–performance model is estimated using cross‐sectional time‐series data and is used to test the influence of ownership changes on performance. Alternative performance measures are considered. The empirical findings show that ownership transformation in the case of regional banks has resulted in improved performance, whilst the benefits in the case of major banks were not significant, even though these banks have become more competitive.     

Location and the theory of production Clarifications and extensions

This paper has attempted to clarify some weaknesses and flaws contained in Miller and Jensen's analysis. In particular, we have demonstrated that in Miller and Jensen's model, if the production function is homogeneous of degree one and the transport rate functions are independent of quantities shipped, it is impossible to have an interior solution. In addition, we have evaluated the role of the generalized transport rate functions in the profit-maximization location model with and without a prescribed level of output and shown that if transport rates depend on quantities shipped and have constant elasticities, then a linearly homogeneous production function is not sufficient to insure that optimum location is independent of output or the demand function. This result clearly invalidates Miller and Jensen's assertion.