《新华字典》第11版对第10版在释义方面的修订

《新华字典》第11版对第10版进行了全面的修订,质量有了大幅度提升。释义修订是此次修订的重点。可分为义项的增补、义项的删减、释文的修改三个大类。该文分类举例并分析第11版在释义方面的修订情况,以期促进《新华字典》的进一步完善。     

The Disappearance of the Perfect 10: Evaluating Rule Changes in Women's Artistic Gymnastics

The 2004 Olympic Games saw a range of judging scandals in the sport of artistic gymnastics that prompted the International Gymnastics Federation to make changes to the sport's judging system. Therefore, following these games, the International Gymnastics Federation reworked the gymnastics scoring system, where the most prominent change was the removal of the ‘perfect 10’ as the highest score possible, to be replaced by an open-ended scoring system. The goal of this paper is to examine the effectiveness of the open-ended system that was introduced in 2006 through examining some of the sport's key values – an approach loosely aligned with broad internalism. It is suggested that the dual purposes of analysing what is achieved and the manner of achieving it are key values of the sport and are differentiated through the way judging utilises two categories known, in gymnastics, as ‘difficulty’ and ‘artistry’. This paper argues that the method of judging ‘difficulty’ is an improvement on previous judging methods. Our analysis of the definition and judging of ‘artistry’ in artistic gymnastics, however, reveals a less certain result.     

Environmental conditions,air pollutants,and airway cells in runners: A longitudinal field study

Abstract

Runners have increased numbers of neutrophils in the airways at rest and after exercise compared with sedentary individuals. The aim of this study was to determine whether Mediterranean seasonal changes in temperature, humidity or airborne pollutants affect the airway cells of runners training outdoors in an urban environment. In nine male amateur runners, cell composition, apoptosis, and inflammatory mediators were measured in induced sputum collected at rest (baseline) and the morning after races held in the fall (21 km), winter (12 km), and summer (10 km). Concentrations of air pollutants were below the alert threshold at all times. Neutrophil differential counts tended to increase after all races (P = 0.055). Apoptosis of neutrophils increased with ozone (P < 0.005) and particulate matter <10 μm (PM₁₀) (P < 0.05) exposure. Bronchial epithelial cell counts were low at all times and weakly correlated with ozone and PM₁₀ concentrations. Apoptotic bronchial epithelial cells increased after all races (P < 0.05). Inflammatory mediators in induced sputum were low at baseline and after the races, and correlated with neutrophil differential counts only at rest. In conclusion, apoptosis of airway cells in runners appears to be affected by both exercise and environmental conditions. Apoptosis of neutrophils increased with exposure to environmental pollutants while apoptosis of bronchial epithelial cells increased after intense exercise. Since no relationship was observed between neutrophil counts and inflammatory mediators 20 h after races, airways inflammation at this time point appears blunted in healthy runners and little affected by exposure to mild seasonal changes and airborne pollutants.     

Vitamin C supplementation does not influence plasma and blood mononuclear cell IL-6 and IL-10 levels after exercise

Abstract

The aim of this study was to determine whether the highest vitamin C supplementation associated with complete bioavailability influences the plasma and blood mononuclear cell IL-6 and IL-10 response to exercise. A double-blinded study of supplementation with vitamin C was performed. After 15 days of supplementation with vitamin C (500 mg · day^?1, n = 16) or a placebo (n = 15), participants in the study completed a 15-km run competition. Blood samples were taken before and after competition. Oxidative stress markers, antioxidants, cortisol, IL-6 and IL-10 were determined in plasma or serum. IL-6 and IL-10 protein and mRNA levels were measured in blood mononuclear cells. Although higher plasma and blood mononuclear cell vitamin C levels were observed in the supplemented group when compared with the placebo one, the two groups showed identical exercise-induced changes in all the measured parameters. Exercise induced increased IL-6 and IL-10 levels in plasma and blood mononuclear cells. IL-6 and IL-10 mRNA levels in blood mononuclear cells increased after the competition. After recovery, IL-6 mRNA returned to basal levels and IL-10 mRNA levels remained elevated. In conclusion, exercise induced increased IL-6 and IL-10 production in blood mononuclear cells. However, vitamin C supplementation did not influence IL-6 and IL-10 response to exercise.     

南非国家高中数学课程与评价标准评介

2012年1月,南非颁布新的高中数学课程标准,较之与以往的南非课程标准相比,新的高中课程标准最为突出的变化体现在对学生评价的重视。在该课程标准中,除对课程颁布的背景、课程目标、课时分配、课程内容有详细介绍之外,还重点强调了对学生学习成就评价的标准。介绍南非高中数学课程标准及其特点,以期为中国高中数学课程改革提供借鉴。     

熄焦方式对焦炭质量影响的研究

熄焦方式对焦炭质量有重要的影响,本实验采用自行设计的熄焦装置研究不同熄焦方式对焦炭质量的影响。实验结果表明,湿法熄焦焦炭抗碎、耐磨及反应后强度较低,反应性较高;干法熄焦焦炭抗碎、耐磨及反应后强度较高,反应性较底;压力熄焦焦炭的各种性能介于湿法熄焦和干法熄焦之间。     

浅谈6KV配电系统故障的查找与处理

6KV系统属于小电流接地系统,由于变压器中性点不接地,单相接地不能形成短路电流,即不能跳闸,电力系统规定发生单相接地,设备运行不能超过2小时。一般情况下,发生单相接地时,接地相电压会降低或为0,另两相电压升高或为线电压,针对6KV配电系统故障的查找与处理进行了论述。     

Investments in modernization, innovation and gains in productivity: Evidence from firms in the global paper industry

This paper examines the impact of investments in modernization and innovation on productivity in a sample of firms in the global pulp and paper industry. This industry has traditionally accounted for significant amounts of employment and capital investment in North America and Europe. In contrast to much of the existing literature which focuses on the impact of R&D and patents on firms’ performance and productivity, we examine data on actual investment transactions in four main areas: (i) mechanical, (ii) chemicals, (iii) monitoring devices and (iv) information technology. We find that firms that implemented a greater number of investment transactions in modernization achieved higher productivity, and these estimated quantitative effects are greater than the impact of standard innovation variables such as patents and R&D. Investment transactions in the information technology and digital monitoring devices imparted a particularly noticeable boost to productivity. These results are obtained after controlling for other firm-specific variables such as capital intensity or mergers and acquisitions. Thus, firms’ decisions to undertake investments in modernization and incremental innovations appear to be critical for achieving gains in productivity, compounding to form meaningful differences in performance, productivity and competitive position across firms in the longer run. For some of the traditional industries like pulp and paper, R&D and patents seem to be particularly poor indicators of innovation and, more generally, how firms go about achieving gains in productivity.     

Existence of three periodic solutions for a nonlinear first order functional differential equation

In this paper, we use Leggett-Williams multiple fixed point theorem to obtain different sufficient conditions for the existence of at least three nonnegative periodic solutions of the first order functional differential equation of the form

y^′(t)=-a(t)y(t)+λf(t,y(h(t))).     

Detection of replay attacks in cyber-physical systems using a frequency-based signature

This paper proposes a frequency-based approach for the detection of replay attacks affecting cyber-physical systems (CPS). In particular, the method employs a sinusoidal signal with a time-varying frequency (authentication signal) into the closed-loop system and checks whether the time profile of the frequency components in the output signal are compatible with the authentication signal or not. In order to carry out this target, the couplings between inputs and outputs are eliminated using a dynamic decoupling technique based on vector fitting. In this way, a signature introduced on a specific input channel will affect only the output that is selected to be associated with that input, which is a property that can be exploited to determine which channels are being affected. A bank of band-pass filters is used to generate signals whose energies can be compared to reconstruct an estimation of the time-varying frequency profile. By matching the known frequency profile with its estimation, the detector can provide the information about whether a replay attack is being carried out or not. The design of the signal generator and the detector are thoroughly discussed, and an example based on a quadruple-tank process is used to show the application and effectiveness of the proposed method.