中国城乡消费水平差异对资源环境影响的比较

中国城乡发展差异显著,消费水平不一,造成人口消费占用的资源环境空间差距较大。本文探究城乡不同消费群体的资源环境影响效果,有助于更好地认识资源环境问题,促进城乡科学协调发展。基于人均消费性支出和单位人概念,研究了1957年-2005年中国城乡消费对资源环境影响的时序变化及相对状况。结果表明,当前1个单位人对环境产生的压力相当于1950年代6～7个单位人的压力;1个城镇居民消费占用的资源环境空间约相当于3个农村居民消费占用的空间;城镇居民对资源环境影响强度超过农村居民约20年;城镇居民对资源环境影响总量增加了34.2倍,农村居民增加了8.33倍;1957年城镇居民对资源环境影响量占36.09%、农村居民占63.91%,2005年城镇居民占68.05%、农村居民为31.95%;1997年之前农村人口消费对资源环境影响量占较大份额,1997年以来城镇人口消费成为资源环境影响的主要方面。     

基于EML构建移动学习资源对象单元的研究

教育建模语言(EML)是构建E-learning资源的技术。该研究以EML应用特征为基础,对移动学习资源进行特征分析,然后对EML在移动学习资源建设中的应用进行了详细的研究和可行性分析,提出了移动学习资源对象单元构建模型,并对该模型进行了关键因素分析,最后给出了EML在大学英语移动学习资源构建中的应用案例。     

矩形波导中TE10波面壁电流密度分布讨论

从矩形波导中TE10波的解出发,由电磁场各分量推导出矩形波导各面壁上的电流分布,指出了多本教材中的错误,同时给出了正确的波导管面壁电流密度分布图．     

Spillovers in the production of knowledge: A meta-regression analysis

The production of knowledge was subjected to quantitative analysis in the second half of the twentieth century, following Arrow (1962). The determinants of knowledge and the externalities present in the innovation process were discussed with immediate policy influence. In particular, the presence and strength of the spillover of the pool of past knowledge has encouraged high subsidization of R&D in the most developed countries. We survey the empirical literature on the spillover effect in the production of knowledge and implement a meta-analytic regression. We discover that the average spillover effect is less than but close to one and is highly significant. We also find that the spillover effect tends to be greater when the estimation of knowledge production accounts for foreign inputs, and it tends to be lower when the estimation includes only rich economies, regional data are used, and the pool of knowledge is not the patent stock.     

信号与系统中单位冲激函数教学方法研究

单位冲激函数的定义及其相关性质是信号与系统课程教学中的难点。文章兼顾工科学生的认知能力和冲激函数δ（t ）数学定义的严谨性,由浅入深,从对冲激函数的物理性质的感性认知出发,而后从矩形脉冲函数序列极限引入冲激函数的抽样性,最后归于其广义函数的严格数学定义。该讲授方法有利于启发学生从形象思维到抽象思维,便于工科学生接受并理解。     

警察入职体测4×10m往返跑技术特点分析

4×10m往返跑是人民警察入职体测中的必测项目,其技术动作包括起跑加速、急停、换取木决、转身加速等环节。通过测试成绩与分析技术特点认为：受测者应根据自身能力特点确定适合的起跑姿势并采用合理加速技术迅速起跑提速;形成右脚在前制动,身体侧对端线的急停姿势;运用稳定性较强的双手同时换取木块技术以提高成绩;并在有效急停和换取木块基础上,完成同步转身和加速动作。     

10km游泳运动员体能训练及负荷控制

针对当前我国10 km游泳运动员体能存在的问题,介绍身体素质训练和有氧能力训练的若干方法,阐述体能训练中负荷量与负荷强度的控制。     

Efficacy of Tumor Necrosis Factor and Interleukin-10 Analysis in the Follow-up of Nonalcoholic Fatty Liver Disease Progression

Tumor necrosis factor (TNF-α) is a cytokine involved in systemic inflammation during acute phase reactions. The current study was designed to investigate the levels of pro-inflammatory cytokine (TNF-α) along with the anti-inflammatory cytokine (IL-10) during progression of non-alcoholic fatty liver disease (NAFLD) from simple steatosis to non-alcoholic steatohepatitis (NASH) and fibrosis in diabetic patients, and correlate the levels of cytokines with the progression of NAFLD. Fifty-two diabetic patients compared to 18 healthy controls were participated in this study. Based on clinical diagnosis, patients were divided into three groups: simple steatosis, NASH and fibrosis. Serum liver function tests, fasting blood glucose, bilirubin, ALT, AST, TNF-α, IL-10 and lipid profile were measured. TNF-α levels were significantly higher in NAFLD patients compared to control subjects with a significant positive correlation with body mass index and fasting blood glucose (FBG) but with negative correlation with IL-10. Serum IL-10 levels were significantly lower in NAFLD patients compared with controls. A positive correlation between IL-10 and HDL-C with concomitant negative correlation between IL-10 and FBG and triacylglycerides was found. Cytokine analyses showed that there was a prominent imbalance between TNF-α and IL-10 in patients with NAFLD, and this imbalance increase by increasing the progression of NAFLD especially in obese diabetic patients. TNF-α and IL-10 could be used in diagnosis and follow-up of NAFLD stages in a way to avoid liver biopsies in greater proportion of patients.     

Hematological Parameters and RBC TBARS Level of Q 10 Supplemented Tribal Sickle Cell Patients: A Hospital Based Study

The study has been undertaken as number of sickle cell patients in Chhattisgarh tribal population is 23.7 %. The Co enzyme Q10 is a strong antioxidant and energy producing compound. The patients were divided into three groups group A homozygous (SS), group B heterozygous (AS) and group C controls for TBARS study. The age group is 10–55 years and 200 mg of CoQ10 was given to A and B groups. The hematological parameters, C reactive protein as well as RBC TBARS level were performed by usual and standard techniques. The results were obtained as 25.37 % increased RBC level in group A and 23.24 % in group B. The increased hemoglobin level was observed as 16.73 % in group A and 10.7 % in group B. In case of WBC it was observed increased 24.38 % in group A and 12.0 % in group B. C-reactive protein was observed 7.8 times decreased in group A and 1.54 times in group B. The RBC TBARS level was also found decreased 48 % in group A and 51 % in group B as compared to group C. During the supplementation of coenzyme Q10 the pain caused by vaso-occlusive events has reduced. This significant increase in hematological parameters as well as decreased C-reactive protein and TBARS level suggest that the Q10 should be included in the diet of sickle cell patients.     

10kV与110kV混压并架线路带电作业人员安全防护研究

10kV与110kV混压并架输电线路可以有效集约土地资源,充分利用线路走廊。为了评估带电作业人员检修10kV配电线路时,上方110kV输电线路对其安全影响,采用有限元电场计算与电场实测的方法研究混压线路空间电场分布和作业人员体表电场分布规律,在此基础上提出了10kV与110kV混压并架输电线路检修作业安全防护方法。