滚齿加工误差分析与检验组(之七) Ⅶ.轴向误差与检验项目

本文是“滚齿加工误差分析与检验组”一文的第七部分。这部分的主要内容是论述轴向误差的产生原因,数学模型以及轴向误差与第Ⅲ公差组之间的关系。     

滚齿加工误差分析与检验组(之六)——Ⅵ.机床周期误差刀具误差及齿形误差

本文是“滚齿加工误差分析与检验组”一文的第六部分。这部分的主要内容是论述机床周期误差、刀具误差对齿形误差的影响,导出了有关计算的数学模型以及与第Ⅱ公差组的关系。     

滚齿加工误差分析与检验组(之二)Ⅱ.齿轮的径向误差与检验项目

本文是“滚齿加工误差分析与检验组”一文的第二部分。这部分的主要内容是分析与研究滚齿加工时产生径向误差(亦称几何偏心)的原因,径向误差的合成方法、特征,径向误差与检验项目的关系、数学模型、几何意义。     

滚齿加工误差分析与检验组 Ⅰ.滚齿加工误差的种类及读数系统

本文是“滚齿加工误差分析与检验组”一文的第一部分。这部分主要介绍滚齿加工误差的种类及齿轮误差的读数系统两个内容,通过这些内容的介绍可为后面的分析与研究做好准备并奠定基础。     

滚齿加工误差分析与检验组(之四) Ⅳ.偏心误差的合成与补偿

本文是“滚齿加工误差分析与检验组”一文的第四部分。这部分的主要内容是分析与研究滚齿加工时既有几何偏心又有运动偏心的情况下应如何考虑其合成与补偿方法、数学模型和几何意义。通过补偿,可以减少加工误差(偏心误差)对齿轮加工精度的影响。     

滚齿加工误差分析与检验组(之三)Ⅲ、齿轮的切向误差与检验项目

本文是“滚齿加工误差分析与检验组”一文的第三部分。这部分的主要内容是分析与研究滚齿加工时产生切向误差(亦称运动偏心)的原因,切向误差的特征,切向误差与检验项目的关系、数学模型等。     

全熔透焊接"H"型钢(腹板16mm以下)免开坡口组焊矫一体化加工技术研究与应用

基于组焊校一体化加工技术焊接"H"型钢在钢结构的应用,本文采用智迈德H/T型组焊矫一体机对全熔透免开坡口"H"型钢(腹板16mm以下)进行工艺性能研究.研究表明:焊接电流对熔深的影响最大,焊接电压对熔宽影响最大,焊接速度、焊接角度对焊缝成型影响和焊脚尺寸影响最大.全熔透焊缝质量与焊接参数之间的匹配相关,只有当焊接参数匹...     

Adaptive aspirations: performance consequences of risk preferences at extremes and alternative reference groups

Goals or aspirations and their relationships to risk taking and performance are important issues in both psychology and strategic management. The concept of adaptive aspirations, as discussed in Cyert and March's Behavioral Theory of the Firm, has long been a topic of interest in both fields. Moreover, many studies in strategy have focused on risk and/or extreme performance. In the current paper, we build on earlier models of adaptive aspirations. We introduce into the models a new risk preference function that incorporates changes in risk preference at extremes of performance. Based on empirical studies and the managerial literature, we also introduce alternative strategies for setting reference groups. Simulations of the resulting models suggest important differences in outcomes from earlier studies and this invites further empirical investigation. These simulations also have significant implications for managerial goal setting. Copyright © 2011 John Wiley & Sons, Ltd.     

OTL电路最大不失真功率计算误差的研究及修正

本文分析了复合互补 OTL 电路最大不失真输出功率的计算误差、误差产生的原因,提出了计算误差的修正系数并推导了计算公式。还定量分析了复合管的饱和压降。     

Strategic groups,competitive groups and performance within the U.K. pharmaceutical industry: Improving our understanding of the competitive process

Strategic group research originated in the 1970s and a number of notable studies centered on the U.S. pharmaceutical industry. Results were, however, conflicting. This paper explores the nature of strategic groups in the U.K. pharmaceutical industry. The study confirms the presence of between six and eight strategic groups across the period studied, 1998–2002. The study also demonstrates a statistically significant relationship between these strategic groups and performance using three performance measures. The paper then compares strategic groups with competitive groups and concludes that the distinction is important and may explain the contradictory findings in earlier strategic group research. Copyright © 2007 John Wiley & Sons, Ltd.     

Business group characteristics and affiliated firm innovation: The case of Taiwan

This paper investigates the relationship between business group factors and affiliated firm innovation in terms of patents granted. We examine the following factors for business groups: group affiliation, group diversification, inside ownership, and family ties. In emerging markets, business groups act not only as an internal capital market, but also as a platform for resource sharing among affiliates. We use Taiwan's business groups as a research sample to investigate how these group factors affect affiliated firms' innovation. The findings indicate that firms that are affiliated with business groups innovate better than their unaffiliated counterparts. Group diversification and family ties have positive effects on firm innovation, while inside ownership has no significant positive effect. Our study contributes to the innovation literature by shedding light on business group factors and firm innovation.     

Rice market integration and food security in Nepal: The role of cross-border trade with India

Coarse rice market integration between Nepal and India is analyzed applying a threshold autoregressive model. The price response behaviour of traders is found to be consistent with an asymmetric price adjustment mechanism, indicating coarse rice prices in Nepal respond to shocks originating in India. The results show that adjustments to negative price deviations from long-run stable equilibrium are faster than adjustments to the positive ones given a null threshold. Given that trade flows mainly from India to Nepal, Nepali traders would adjust their prices upward to align with the long-run equilibrium value relatively more quickly in the case of negative price deviations, than if the price deviations were positive. Such a high speed of adjustment to negative price deviations could be detrimental to net food buyers’ food security status in the absence of a price stabilization mechanism. However, a price stabilization policy in Nepal, a food deficit and import dependent country, would hardly have any effect on prices unless further effort is made to build up the level of national food reserves for short-term food security interventions. In the current context of structurally low levels of national food reserves, an alternative short-term policy such as foreign aid, in the form of food or income transfers, targeting the most vulnerable households to price increases is necessary through social safety net programmes. In the long-run, an improvement of transportation infrastructure between market hubs (other than the Biratnagar trade basin) in the Terai (Nepal) and India would contribute to the reduction of transaction costs and create incentives for more competition in formal cross-border trade with India. In times of negative shocks such as the high food price crisis in 2008, restrictive food trade policies in India will continue to undermine household food security in Nepal.