桩端注浆超长灌注桩的极限承载力研究

为提升后注浆超长钻孔灌注桩的承载性能,以静载试验数据为基础,对3根后注浆超长钻孔灌注桩的桩侧阻力、桩身轴力以及荷载-沉降等因素进行了系统分析.通过拟合Q-S曲线预测了单桩极限承载力,并利用有限元模型分析了桩端注浆桩单桩承载力的影响因素.研究表明,1)桩端注浆超长桩的Q-S曲线变形缓慢;2)桩身荷载主要由下部土层决定;3...     

Intraday Volatility in Interest‐Rate and Foreign‐Exchange Markets: ARCH,Announcement, and Seasonality Effects

We explore the determinants of intraday volatility in interest‐rate and foreign‐exchange markets, focusing on the importance and interaction of three types of information in predicting intraday volatility: (a) knowledge of recent past volatilities (i.e., ARCH or Autoregressive Conditional Heteroskedasticity effects); (b) prior knowledge of when major scheduled macroeconomic announcements, such as the employment report or Producer Price Index, will be released; and (c) knowledge of seasonality patterns. We find that all three information sets have significant incremental predictive power, but macroeconomic announcements are the most important determinants of periods of very high intraday volatility (particularly in the interest‐rate markets). We show that because the three information sets are not independent, it is necessary to simultaneously consider all three to accurately measure intraday volatility patterns. For instance, we find that most of the previously documented time‐of‐day and day‐of‐the‐week volatility patterns in these markets are due to the tendency for macroeconomic announcements to occur on particular days and at particular times. Indeed, the familiar U‐shape completely disappears in the foreign‐exchange market. We also find that estimates of ARCH effects are considerably altered when we account for announcement effects and return periodicity; specifically, estimates of volatility persistence are sharply reduced. Separately, our results show that high volatility persists longer after shocks due to unscheduled announcements than after equivalent shocks due to scheduled announcements, indicating that market participants digest information much more quickly if they are prepared to receive it. However, contrary to results from equity markets, we find no evidence of a meaningful difference in volatility persistence after positive or negative price shocks. © 2001 John Wiley & Sons, Inc. Jrl Fut Mark 21: 517–552, 2001     

Host-site institutions,regional production linkages and technological upgrading: a study of automotive firms in vietnam

Using technological capabilities as embodied in machinery, organization, processes and products, this study examines the links with host-site institutions and regional production linkages. The statistical results show no relationship between these variables. In-depth interviews complement the quantitative findings. Overall, the result shows that the government’s localization efforts failed because too many joint-venture assemblers were approved in the 1990s when the domestic market was small. The lack of economies of scale also affected the growth of national suppliers. Hence, national producers are confined to low value added segments and lack the quality to compete in export markets.     

A longitudinal study of online non-relationship intentions

In their eagerness to develop relationships with customers, some marketers often overlook the fact that not all consumers may be interested in maintaining a relationship with the firm. In this research, the authors develop a theoretical model as to why many customers do not wish to maintain a relationship with e-businesses and test the model over time. The results show that consumer-relationship value perceptions affect non-relationship intentions. Moreover, even though non-relationship intentions in a certain time period do not directly affect non-relationship intentions in the immediate future time period, promotion events may play a mediating role in this relationship.     

Designing loyalty programs that matter to customers

This study explores a model proposing a customer loyalty program as an identity marketing tool that evokes customer's identity salience (one's perception that a loyalty program membership is important to his/her identity). The results of a Web-based experiment indicate that identity salience is heightened by (1) the uniqueness and exclusiveness of a loyalty program (distinctiveness), and (2) by the fit between the function of the program's rewards and the customer's identity goal (identity congruence). The heightened identity salience, in turn, positively influences the customer's attitude toward the retailer, satisfaction with the loyalty program and the perceived quality of his/her relationship with the retailer.     

Does foreign investment benefit the exporting activities of Vietnamese firms?

Using firm-level data, this paper examines the effects of foreign investment on the exporting behaviour of domestic firms in the Vietnamese manufacturing and service sectors. Applying the Heckman selection model on panel data and following the Wooldridge approach, we find that investment by foreign firms has a significant positive effect on the decision of domestic firms in the same and upstream sectors to export. The proportion of exports of domestic firms declines through horizontal and forward linkages, but increases through backward linkages in the manufacturing sector. However, there is only weak evidence in support of export spillovers on domestic firms in the service sector. We also find that the presence of foreign firms has differing effects on the exporting activities of low- versus high-tech firms in the manufacturing sector.     

Small and Medium‐Sized Enterprises' Collaborative Buyer–Supplier Relationships: Boundary Spanning Individual Perspectives

Boundary‐spanning individuals (BSIs) play a critical role in supply chain management, especially in small and medium‐sized enterprises (SMEs) where interactions with buyers and suppliers can depend heavily on just a few individuals. This study, utilizing data from Korean manufacturing‐sector SMEs, explores whether cooperative social value orientations of SMEs' BSIs influence the effects of collaborative buyer‐supplier initiatives. The results suggested that the performance implication of decision‐sharing initiative increases when BSIs have a high level of cooperative social value orientation. However, it also negatively moderates the relationship between risk/benefit sharing (involving financial losses or gains) and performance suggesting possible negative side effects. However, we found that such orientation also negatively moderates the relationship between risk/benefit sharing (involving direct financial losses or gains) and relationship performance suggesting possible negative side effects.     

Daily outfit satisfaction: the effects of self and others' evaluation on satisfaction with what I wear today

This study investigated the satisfaction of the outfit which an individual chose to wear for the day by examining how self and others' evaluations influenced the outfit satisfaction and the intention to re‐wear. In addition, moderator variables (body satisfaction and body surveillance) that affected the effect of the evaluative factors upon satisfaction and behavioural intention were also examined. An online‐survey was conducted and the sample size used in the analysis was 349 in total. Using SPSS 18.0 and AMOS 18.0, structural equation modeling analysis and one‐way analysis of variance were implemented for hypothesis testing. The results showed that self‐evaluation as a perception of appropriateness of the outfit for that day and others' positive feedback increases outfit satisfaction. Appropriateness perception also had a significant impact on the intention to re‐wear. However, feedback from others on one's outfit did not have a significant direct effect on behavioural intention. Three‐way ANOVA was performed to verify the impact the feedback from others, body satisfaction, and body surveillance had on the respondent's intention to re‐wear, and a three‐way interaction effect was statistically significant. While individuals with high body satisfaction were likely to be confident about their appearance overall, the feedback from others did not impact their satisfaction. Individuals with low body satisfaction were influenced by others' feedback on their outfit. Individuals with high levels of body surveillance who sensitively monitored others' feedback especially displayed decreased intention to re‐wear when feedback from others on their outfit was negative. This research contributed to the deeper understanding of consumer's clothing behaviour at the post‐purchase stage. Enhanced understanding of lasting satisfaction and benefits pursued throughout the time while using the product would be essential in developing consumer‐centric marketing strategies.     

3种ELISA试剂盒对牛新孢子虫血清抗体比较检测

用瑞典Svanova公司、美国IDEXX公司和美国VMRD公司生产的3种检测新孢子虫血清抗体ELISA试剂盒对来自澳大利亚牛血清（41份）、新西兰牛血清（40份）、乌拉圭牛血清（30份）和中国新疆牛血清（46份）进行了同步检测和比较分析,并以其中2个试剂盒检测结果均为阳性或阴性的血清为真阳性或真阴性,对另1个试剂盒在诊断相对敏感性和相对特异性方面进行了比较评估。结果表明,3个试剂盒的诊断相对敏感性和诊断相对特异性分别为：85.7%和92.5%（Svanova）、95.8%和98%（IDEXX）、88.5%和98%（VMRD）。3个试剂盒都具有较好的重复性,检测低限相近。在对样品的检测中,IDEXX与VMRD两个试剂盒检测符合率较高,但对不同国家的样品检测符合率差别较大。