变频器保养及常见故障

本文主要论述了变频器的优点、日常检查工作、保养及一些常见故障的处理方法     

超限车辆与桥梁承载力试验研究

通过超限车辆——主变压器运输车通过莆田枫亭桥的过桥方案及过桥时的临时加固方法的研究分析，认为，对施工中留有隐患的旧桥和实际受力状态难以确定的桥梁，宜采用实桥静裁试验方法来直接测定其承裁力；在超限车辆过桥时应制定相应措施加强管理。     

Persuasive impact of loss and gain frames on intentions to exercise: A test of six moderators

The current study situated loss/gain-framing research in the extended parallel process model and tested whether two message features (dose, efficacy appeals) and four individual difference variables (walking self-efficacy, grit, consideration of future consequences, health information overload (HIO)) moderated the impact of message framing on intentions to engage in physical activity. Adults (N?=?341, M_age?=?38.09, SD?=?10.94) were randomly assigned to one of eight message conditions advocating exercise behavior. All four individual difference variables significantly moderated framing effects such that gain-framed messages were more effective for individuals with lower walking self-efficacy, grit, and consideration of future consequences and loss-framed messages were significantly more effective for individuals with higher walking self-efficacy, grit, consideration of future consequences, and for those with lower HIO.     

Too Much of a Good Thing

Abstract

Information overload is a problem that affects law librarians every workday. Information overload occurs when the receiver receives so much data that the receiver is unable to engage in higher levels of processing. Technology and cultural influences play a significant role in creating information overload. Law librarians are particularly susceptible to information overload due to the characteristics of their profession. We should care about information overload because it has lasting negative consequences for our profession. Even though information overload is a real problem with serious consequences, there are numerous ways to minimize information overload and its effects.     

The Information Explosion and the Adult Learner: Implications for Reference Librarians

Summary

In looking for answers to their learning and information needs, adult learners face an information explosion as one component of their complex world. While adult learners represent a wide variety of developmental stages, for information literacy, for a successful search for electronic information, each one must learn to cope with the burgeoning explosion of information. This paper explores the challenges of information gathering and examines the specific needs and characteristics of the adult learner in relation to information gathering. It presents strategies to assist the reference librarian in developing the necessary skills as well as methods to assist the adult learner.     

转子压缩机过载保护器的优化匹配

文章介绍了转子压缩机目前常用的外置过载保护器的工作原理、关键参数,结合试验情况,对选配的方法以及如何优化匹配进行了详细的研究总结。     

The effects of information literacy on trust in government websites: Evidence from an online experiment

Information and communication technologies in use in government systems can bring about expected benefits only when citizens are willing and able to use such systems. Previous studies from various disciplines provided a fundamental understanding of human behavior with technology adoption that focused mainly on the technical and supply sides of this adoption. We argue that it is necessary to move away from an assumption that users form a homogeneous group under the phenomenon of the digital divide. Having conducted an online experiment, this study empirically examined the effects of personal factors, particularly the perceived information literacy, and the perceived information overload, on the user’s perceptions on the usefulness and trust in a government website. We find that the higher an individual perceives one’s information literacy, the more he or she trusts the website, and this is mediated by one’s perceived information overload (negatively) and perceived usefulness (positively). This research provides a more balanced understanding of the behavior of e-government adoption, supplemented with the details of citizen engagement factors, and specifies meaningful practical implications for successful e-government policies.     

大负荷运动引起的大鼠心肌收缩力变化及其与心肌自由基、钙离子水平的关系

目的:获取大负荷跑台运动引起大鼠心肌收缩力动态性变化的信息,总结其变化特征,探讨其变化与心肌自由基、钙离子水平的关系。方法:成年雄性SD大鼠32只,随机分为空白对照组(A组)、运动后即刻组(B组)、运动后3 h组(C组)与运动后24 h组(D组)。运动心力监测仪监测D组大鼠运动前与运动后不同时相的心力信号。测定血清cTnI浓度;测定心肌SOD活性、MDA含量与Ca2+浓度。结果:第一心音幅值在运动后即刻已有下降,随后连续多时相显著低于运动前水平,至运动后24 h时完全恢复。运动引起血清cTnI浓度显著升高,引起心肌SOD活性显著下降、MDA含量显著升高与Ca2+浓度显著升高;上述变化均以C组最明显。结论:大负荷运动引起大鼠心肌收缩力下降,以运动后恢复期最明显,但为可逆性;心肌收缩力下降可能与心肌自由基增多、钙超载有关。     

四个水上奥运项目运动员运动损伤的研究

运用文献资料等方法对我国四个奥运水上项目运动员发生运动损伤的情况进行分析研究,结果表明:(1)运动损伤的发生与训练的年限运动员的年龄及项目技术特点有关;(2)运动损伤的部位主要集中在腰、腿、膝等部位,造成损伤的原因除项目特点和训练手段外,主要是大强度超负荷训练造成的,建议加强训练的科学化。     

内燃液力传动叉车行驶工况下的燃油经济性计算

对以内燃机为动力的液力传动叉车行驶工况下的燃油经济性计算进行了分析研究，并提出了一种较为简便、实用的计算方法，该方法经台架试验验证，其计算结果与实测值基本相符。