离心摆式减振器运动微分方程的修正

用拉格朗日方程导出离心摆式减器精确的运动微分方程，并根据工程实际中挂摆式减振器结构，提出考虑平行四边形效应的运动微分方程的修正。     

上海股市五年综观

上海股市五年综观□张国枢，张开宇上海股市自１９９０年１２用１９日发布实施上证指数以来，至１９９５年１１月１７日，已运行了５后，作为我国的一个新兴资产市场，表现出极大的生命力租发展前景。其间，风风雨雨，涨涨跌跌，吸引了千万人的积极参与，为国内外各界人士...     

Key Determinants of the Stage of Internationalisation of Australian Wineries

A four stage measure capturing, awareness, interest, trial and adoption is employed to identify the key determinants of the stage of internationalisation of Australian wineries. Drawing from data from 292 wineries and using structural equation modelling techniques, this paper analyses the effects of a multitude of factors previously hypothesised to influence the stage of internationalisation. The results indicate that while these wineries exhibit characteristics described in the extant literature, significant differences remain. The paper concludes by discussing the limitations and areas for further research.     

Expected exponential utility maximization of insurers with a Linear Gaussian stochastic factor model

In this paper, we consider the problem of optimal investment by an insurer. The wealth of the insurer is described by a Cramér–Lundberg process. The insurer invests in a market consisting of a bank account and m risky assets. The mean returns and volatilities of the risky assets depend linearly on economic factors that are formulated as the solutions of linear stochastic differential equations. Moreover, the insurer preferences are exponential. With this setting, a Hamilton–Jacobi–Bellman equation that is derived via a dynamic programming approach has an explicit solution found by solving the matrix Riccati equation. Hence, the optimal strategy can be constructed explicitly. Finally, we present some numerical results related to the value function and the ruin probability using the optimal strategy.     

How supply chain architecture and product architecture impact firm performance: An empirical examination

In order to enhance performance, manufacturing firms are building various capabilities and utilizing supply chain networks that are geographically dispersed around the globe. This study examines how decisions related to supply chain architecture and product architecture influence organizational competitiveness. Building on the co-specialization perspective, we evaluate the performance implications of product modularity and supply chain agility. While, product modularity constitutes a product configuration related to sourcing and assembling of products, supply chain agility is a supply chain configuration related to velocity (sensing, comprehending, and responding) and visibility (supplier network, internal operations, and external environment). Both the product and supply chain architectural decisions can impact performance, individually and in conjunction with each other. We empirically test the hypothesized relationships using data collected from 103 manufacturing firms. Results show that supply chain agility and product modularity directly enhance responsiveness and enable organizations to reduce cost. Furthermore, supply chain agility partially mediates the relationship between product modularity and both responsiveness and cost reduction. We elaborate on the key contributions of this study for both research and practice, discuss limitations, and also offer various avenues for further research.     

Information congruity in scarcity appeal: A structural equation modeling study of time-limited promotions

Although market scarcity such as time restriction is widely used in retail advertisements, its impact on product message processing and product evaluation is still subject to controversy. In this study, analyses through structural equation modeling indicated that (i) scarcity had no impact on product message processing, (ii) scarcity had a direct impact on product evaluation as a heuristic cue when the value inferred from scarcity was congruous with the worth derived from product message, and (iii) scarcity lost its impact on product evaluation when the value inferred from scarcity was incongruous with the worth derived from product message, and the incongruity prompted scrutiny of product message, resulting in a mediated impact of product message on product evaluation through product message processing. In conclusion, the results supported an information congruity theory of market scarcity.     

将数学建模引入高等数学教学中的典型案例

首先阐述了将数学建模思想融入高等数学教学内容中的意义,接着从高等数学中的基本概念和基本定理出发,通过具体案例说明如何将数学建模案例融入在高等数学教学中。最后给出了根据高等数学内容选编的典型建模案例。     

水库库区运营管理政策满意度的空间异质性分析

针对水库库区政策体系因自然资源禀赋差异性导致的政策满意度异质问题,引入顾客满意度理论,基于结构方程模型,构建了异质资源禀赋下库区居民政策感知的结构方程模型,揭示水库库区政策满意度空间分异特征,提出异质资源禀赋下水库库区政策制定的对策建议。并以浯溪口水库为例,应用本文研究框架,探究库区居民政策感知偏好的空间分异特征。     

Forecasting technology diffusion: a new generalisation of the logistic model

The present research proposes a new generalisation of the logistic model aiming at technology diffusion forecasting. Regarding criticisms and failures reported in the literature to apply logistic function for long-term forecasting, in our work we focused on short-term accuracy of forecast. To formulate the model, based on mathematical approximation, at first the differential equation governing the diffusion process is found and then by solving the derived differential equation, the forecast function is obtained. In all steps, mathematical tools from numerical analysis are used. We compared the New Generalized Logistic Model with eight of the most renowned models in the literature. The model led to more accurate fits and forecasts than those obtained from other models we applied for comparison.     

Distance-sensitivity of German exports: first evidence from firm-product level data

This article uses a tailor-made new data set of 7 580 251 observations for German exports at the firm-product-destination level to estimate a gravity equation and to investigate the link between the amount of firms’ exports and the distance to destination countries. It is shown that, in line with stylized facts based on aggregate data, the quantity of exports declines significantly with distance within a firm for a given product.