间隔部主动固定电极对患者心功能的影响

目的探讨右心室间隔部主动固定电极对患者心功能的影响。方法选取我院置入永久起搏器的患者90例,将其分为右室间隔部起搏组(RVOTS组)和右心室心尖部起搏组(RVA组),术后比较两组患者的相关参数。结果两组患者术后心电图QRS时限均较术前明显升高,差异均有统计学意义(均P<0.01);两组术后左心房内径(LAD)均较术前升高,RVA组升高较为明显(P<0.05);两组术后左心室射血分数(LVEF)均较术前降低,RVA组减低明显(P<0.05);两组术后左室舒张末期内径(LVEDd)较术前均无明显变化,差异无统计学意义(P>0.05);两组术后心功能纽约心脏病协会(NYHA)分级均较术前升高,但RVA组升高明显,差异有统计学意义(P<0.01)。RVOTS组不良心血管事件发生率明显低于RVA组(P<0.05)。结论 RVOTS起搏有利于双室电激动同步,安全可靠。     

税收征管、法制环境与企业投融资活动

已有多篇文献强调税收征管的“治理效应”对企业行为的影响,却忽视了税收征 管可能存在的“征税效应”。本文立足于中国政企关系现实状况,着眼于系统评估税收征管的 “征税效应”对企业投融资活动的影响。基于2007-2013年中国A股上市公司数据的研究发现： 严格的税收征管提高了公司投资-现金流敏感性,降低了公司投资-托宾Q敏感性,且上述效应 对国有上市公司而言更显著。这意味着,税收征管会加剧上市公司尤其是国有上市公司的融资 约束,损害其投资效率。本文还证实法制环境的改善有助于缓解公司融资约束,提升公司投资 效率。本文不仅为理解税收征管活动的“征税效应”提供了有益视角,更为改善企业投融资环 境提供了政策启示。     

International Diversification, Industrial Diversification and Firm Performance of Hong Kong MNCs

Although multinational corporations (MNCs) are not new to business research, Asian MNCs and their performance have yet to be widely studied. This study investigates the relationship between international diversification, industrial diversification and firm performance of MNCs from Hong Kong. In contrast to previous findings, the results show that Hong Kong MNCs are more internationally diversified, but not performed better, than domestic firms. Also, among Hong Kong MNCs, international diversification has a positive impact on profitability and sales growth, but not on the profitability. Industrial diversification also enhances profitability stability but reduces profitability significantly. Neither the hypothesized inverted U-shaped relationship between international diversification and performance nor the interaction effect from both international and industrial diversification strategies on performance can be validated. Implications are discussed with reference to the local context.     

The role of change agent as mediator in the relationship between HR competencies and organizational performance

Human resource (HR) practitioners, as change agents, are responsible for easing the impact of changes in their organization and to protect employees against the side effects of these inevitable changes. Sometimes, the change helps to produce a significant increase in performance and the company can boost sales and production without additional cost. Several vital competencies that are reviewed in this paper include business knowledge culture management, effective relationship and human resource development skills. Based on the findings of this study, not all competencies are related to the role of change agent. HR practitioners who are unable to function as change agents will inevitably create a barrier against their becoming a well-integrated strategic partner. Therefore, the role of change agent also mediates the relationship between certain HR competencies and organizational performance.     

An analysis of the relationship between HR professionals' competencies and firms' performance in Malaysia

This study examines the competencies of human resource professionals in the manufacturing companies of Malaysia. The competencies that are examined in this study are business knowledge, strategic contribution, HR delivery, personal credibility, HR technology and internal consultation. All these competencies will be tested whether or not they are significantly related to a firms' performance. The sample employed here consists of HR professionals from Malaysian manufacturing companies in the southernmost state of Malaysia, Johor.A total of 89 firms responded to the survey exercise. This study uses quantitative methods such as spearmen ρ correlation and multiple regression analysis to test the variables. The finding shows that the top nine ranking HR competency factors are from the domain of personal credibility and HR delivery. The respondents' self-rated competency shows that personal communication, legal compliance, effective relationship and performance management rank above all other factors. Competencies such as strategic contribution, business knowledge, HR technology and internal consultation have significant correlation with firms' performance. Furthermore, it is found that out of all HR competencies, the highest contributions to a firm's performance are strategic contribution and internal consultation.     

Work Design–Related Antecedents of Turnover Intention: A Multilevel Approach

Previous research on employee‐turnover intention has focused mostly on a single level of analysis. This multilevel study of 1,149 employees and 144 managers from a 21‐store Taiwanese retail home improvement chain demonstrated that individual and store‐level factors were significantly associated with employee‐turnover intention. Job characteristics explain within‐store variance. In addition to age and tenure similarity among employees, transformational leadership and compensation explain between‐store variance. Theoretical and practical implications of the research are also discussed.     

Model averaging by jackknife criterion in models with dependent data

The past decade witnessed a literature on model averaging by frequentist methods. For the most part, the asymptotic optimality of various existing frequentist model averaging estimators has been established under i.i.d. errors. Recently, Hansen and Racine [Hansen, B.E., Racine, J., 2012. Jackknife model averaging. Journal of Econometrics 167, 38–46] developed a jackknife model averaging (JMA) estimator, which has an important advantage over its competitors in that it achieves the lowest possible asymptotic squared error under heteroscedastic errors. In this paper, we broaden Hansen and Racine’s scope of analysis to encompass models with (i) a non-diagonal error covariance structure, and (ii) lagged dependent variables, thus allowing for dependent data. We show that under these set-ups, the JMA estimator is asymptotically optimal by a criterion equivalent to that used by Hansen and Racine. A Monte Carlo study demonstrates the finite sample performance of the JMA estimator in a variety of model settings.     

我国青贮技术发展的关键问题及解决对策

总结了青贮技术发展概况,分析了我国青贮饲料的发展现状,概述了青贮中影响饲料品质的各项因素,提出我国青贮饲料的发展的策略。针对青贮饲料技术的瓶颈,提出发展的关键点。针对青贮饲料向产业化模式转变,从我国农村畜牧养殖业的产业格局、目前国家对青贮饲料的宏观政策以及青贮技术在我国的应用三个方面,提出青贮饲料在我国应用和发展过程中存在的问题,并提出我国青贮技术应用发展中的优化措施。     

农民工返乡刨业的现状与问题调查——基于全国24省157村885户的调查

就业是民生之本,创业对就业具有促进作用,农民工返乡创业这一重要现象,对于发展农村经济,促进城乡一体化．建设社会主义新农村意义重大。文章通过对全国26个省126个村885位农民工的问卷调查与访谈,了解当前我国农民工返乡创业的基本状况,分析其存在的主要问题,并就如何引导农民工返乡成功创业提出了对策建议。     

一种无线传感器硬件系统设计

介绍了一种基于NRF24L01无线传输模块构建的近距离无线传感器系统,重点阐述了数据采集发送模块和数据接收模块的硬件设计原理,并对该系统进行了测试,结果表明该系统运行稳定.