纳米技术在机械工程中的应用浅谈

纳米技术的研发对于科技发展是一重大突破,现已应用于社会各领域,在机械工程中的纳米技术运用更是成为其核心。其表现在很多多方面,本文试图从实例出发展现纳米技术在这一领域的运用,同时得出对于传统机械工程的改变。     

深化“健康第一”理念,重塑体质锻炼根本——新探青少年体质下降的原因及解决措施

近20年我国青少年学生体质健康状况不容乐观。随着身高、体重、胸围等形态发育指标的持续增长,肺活量、速度、力量等体能素质却在持续下降。很多专家认为,青少年体质下降的根本原因在于高考指挥棒的高压下,学校和学生片面注重文化课,忽视体育活动造成的。针对这一现象,本文从中学体育课结构、社会环境等方面,探析青少年体育体质下降的因素及解决措施。     

普通高校体育课的开设与健身效应探讨

体育课是国家落实的一项基本政策,因此各普通院校都重视体育课的健身作用和地位,尤其是高效率快节奏的当今社会,要求学生劳逸结合,有很高的身体素质和心里素质,以便将来适应社会,那么体育课的健身效果有哪些?本文通过每年一次的大学生体质健康测试数据的对比,有力的证明体育课的健身效应,并督促大学生积极投入锻炼,积极上好体育课,达到锻炼身体的效果。     

A comparison of work absence periods and the associated costs for two different modes of exercise therapies for patients with longstanding subacromial pain

Abstract

Background: There are no studies on economic issues concerning rehabilitation exercises for shoulder pain.

Objective: The aim of the study was to investigate sick leave and the associated costs after a medical exercise therapy programme in patients with longstanding subacromial pain/impingement.

Methods: A randomised controlled trial in which 61 patients were randomly assigned either to a high-dosage medical exercise therapy group (HD) (n=31) or to a low dosage exercise therapy group (LD) (n=30). Both groups were given three treatments a week over 3 months. The differences between the groups were number of repetitions, number of sets and time performing global aerobic exercises.

Results: The outcome for the HD group was significantly (p<0.05) better compared to the LD group. The reduction in costs for sick leave for the HD group was 59.1%, whereas for the LD group, the reduction was only 42.3%, which is a significant difference.

Conclusion: In patients with longstanding subacromial pain, HD medical exercise therapy might be an efficient treatment approach.     

Mean reversion in annual earnings and its implications for security valuation

This article documents the long-horizon mean reverting character of annual earnings and tests the implications of such mean reversion for security valuation. First, both theory-based and nonparametric measures of earnings persistence decrease as the estimation order increases, revealing 40 percent less long-horizon persistence than expected under the commonly used random walk model. Second, the return responses to the earnings shocks are more closely related across firms to the higher-order measures of persistence that reflect significant long-horizon mean reversion. Third, the persistence measure derived from classical valuation theory outperforms the generic measure in explaining the return responses. Taken as a whole, these results provide evidence for significant mean reversion in the higher-order properties of earnings and for the stock market incorporating these properties in a manner consistent with classical valuation theory.     

The "Invisible Hand"

The argument of the "Invisible Hand" is that the system of free enterprise benefits society in general even though it is not the aim of any particular economic agent to do that. This article proposes an analysis of why this is so. The key is that the morality of the market forbids only force and fraud; it does not require people to do good to others. Nevertheless, when all transactions are voluntary to both parties, that is exactly what we can expect to happen. This is both because the sum of the benefits of innumerable transactions, which are beneficial to both parties, is very great, but also and especially because of Positive Externalities. People use the particular products and services they get in market exchanges in ways that benefit others in ways not at all foreseen by the agents to those transactions at the time. These externalities range from the benefits of invention and ingenuity to the exercise of charity and philanthropy, all of which flourish in developed capitalist societies.     

普通高校"健身体育教学"模式的探索

"健身体育教学"模式的实验研究表明,在一年级新生中开设健身体育课是可行的,能够适应学生的需要,有利于培养学生独立锻炼的能力,增强学生身体素质.     

Effective experimental controls for research in international accounting: Further thoughts

This paper responds to recent research by Ruland et al. [Ruland, W., Shon, J., Zhou, P., 2007. Effective controls for research in international accounting. Journal of Accounting and Public Policy, 26(1), 96–116.] that addresses the effectiveness of experimental controls for research in international accounting, with focus on Ndubizu and Sanchez [Ndubizu, G.A., Sanchez, M.H., 2006. The valuation properties of earnings and book value prepared under US GAAP in Chile and IAS in Peru. Journal of Accounting and Public Policy 25 (2)]. We attempt to remove some misconceptions about effective experimental controls that have surfaced in the debate. We argue that theory and refined proxies alleviate many of the control issues that have surfaced in the literature.     

身体锻炼对主观幸福感的影响研究

通过查阅文献、归纳分析,梳理和评述身体锻炼对主观幸福感的影响及其相关心理机制的研究现状,了解目前该领域研究中所存在的不足,为进一步全面、深入地了解身体锻炼对主观幸福感的影响进行研究展望。     

江汉大学男篮运动员专项素质现状及其分析

运用问卷调查法、文献资料法等方法，通过对江汉大学男篮运动员与湖北省3支CUBA男篮运动员的各项身体素质进行的调查和对比分析，研究表明江汉大学男篮运动员中锋、前锋的身高以及后卫的耐力素质与其他三所高校的男篮运动员相比有显著差异，对江汉大学男篮运动员专项身体素质的全面调查和分析，可以为教练员和运动员科学地认识专项身体素质提供新的理论基础，通过科学合理的训练，使运动员的身体素质和篮球技术得到提高，在CUBA的比赛中取得更好的成绩。