风电偏航、变桨轴承寿命试验装置研制

本文针对风电偏航轴承、变桨轴承的性能特点,按照风机受力载荷谱,模拟风机轴向和径向受力特点进行加载,从而实现对特大型偏航、变桨轴承的寿命和冲击性能进行试验,并由此验证轴承设计和制造是否符合风电场实际应用要求。结果证明,本文采用的试验方法和装置能够有效地模拟轴承实际受力工况,具有较强的创新和实用性,填补国内空白,并在国际上处于相对领先地位。     

民族预科生数学水平评估的探究

文章围绕民族预科生数学水平评估的意义、设计思想、方式及评估量表的研制、测试题的编制进行阐述,对数学水平的内涵进行了界定。     

基于机器学习的凋亡蛋白的亚细胞位点预测

准确预测凋亡蛋白的亚细胞位点有利于理解细胞死亡的机理和其生物学功能。本文利用裂解位点的蛋白质序列信息提出了一种新的凋亡蛋白的预测算法PSSP.对三个凋亡蛋白数据集进行Jackknife验证表明我们的方法得到了令人满意的结果。     

金融业国际化发展与经济竞争力——基于浙江视角的实证研究

浙江省金融业国际化通过多种效应对经济产生重要的拉动作用。本文利用2006年1月至2009年12月的月度时间序列数据,对变量进行了Granger因果关系检验,建立了基于VEC模型的脉冲响应函数,对浙江经济竞争力对金融业国际化发展的动态响应结果进行了分析。检验结果表明,浙江省金融业的国际化发展有利于浙江省经济竞争力的提高。基于上述结论,本文提出了浙江金融业国际化发展的对策建议。     

A revisit on real interest rate parity hypothesis – simulation evidence from efficient unit root tests

A set of unit root tests are applied to test the existence of long-run real interest rate parity among the G-10 countries over the period 1971M1 to 2007M2. Rather than trusting the asymptotic distributions, this article uses simulation techniques to establish the small sample distributions of these tests, conditional on the stationary and nonstationary processes. The empirical results indicate that the tests have stable finite-sample sizes and higher size-adjusted powers such that the two estimated processes can be distinguished from each other. Thus, for six of the nine countries, their series are more likely to come from the estimated Autoregressive (AR) stationary process than from the nonstationary process. Noticeably, the testing results are rather different from those using the asymptotic distributions, in which only three countries support the real interest rate parity.     

基于触摸式一体机的仪表综合试验台设计

文章从硬件设计和软件开发两方面描述了触摸式一体机仪表综合试验台的研发。通过基于Windows CE操作系统下的控制平台,实现了仪器仪表测量数据的自动保存及打印功能。     

百色水利枢纽消力池底板抗浮稳定计算与分析

根据百色水利枢纽“表孔宽尾墩＋中孔跌流＋底流式消力池”联合消能工的特点，结合消力池地质条件的复杂性，利用消力池底板动水荷载模型试验成果，考虑止水失效工况，进行底板抗浮稳定计算和分析。     

How much do plant guarantees reduce perceived risk?

Abstract

Consumers do perceive risk in purchase decisions and seek to reduce both uncertainty and probability of loss. Risk also varies across persons and purchasing situations. Retailers promote product guarantees as risk reducers, but the quantitative evidence is lacking. They offer guarantees to help resolve outcomes from post-purchase problems mainly, product performance. We used an online survey to investigate the role of risk mitigation by money-back guarantees (MBGs) on a live product: plants. We obtained online responses from 504?US residents?≥?age 18 years who had made at least one live plant purchase in the six months prior to the study. As MBG length increased, perceived risk (PR) decreased. PR was higher for men than for women and declined as income increased. Subjects with a higher level of product involvement, expertise, delight, repurchase intentions, and regret had a higher level of PR. We conducted separate Chow tests for annual and perennial plants by price and MBG length and found several break points. As price increased from $5 to $10, a 30-d MBG reduced PR for annual plants while the reduction in PR was incrementally decreased for all guarantee lengths when annuals were priced over $20. With perennial plants, the MBG had an increasingly larger effect on reducing PR for each $10 increase in price. Overall, for each day increase in MBG length, we observed a 0.0337 decrease in PR, which meant that a 90-d MBG on a plant would reduce PR by 3%. This quantitative evidence of reduction in PR should encourage the use and communication of MBGs which have the potential to improve purchases, customer retention, and profitability.