语义知识和文体知识同大学英语写作能力的正相关解读     

魏林 《福建教育学院学报》2010,11(4):95-99

写作是全国大学英语四、六级统考很重要的组成部分,它客观地反映出考生的英语语言的综合应用能力,有助于教师了解和评价学生的英语真实水平和语言素养。文章对近一、二年大学英语四、六级作文34篇样卷（RANGE—FINDERS,6RSH2）反映出的考生在词语搭配、语义知识、句法结构和文体程式化方面存在的问题进行了量化研究,并探讨大学英语写作教学上亟待解决的一些问题。  相似文献   

条带模式、聚束模式和滑动聚束模式的比较     

刘寒艳  宋红军  程增菊 《中国科学院大学学报》2011,28(3):410-417

条带模式、聚束模式和滑动聚束模式是SAR的3种工作模式.系统地论证了3种成像模式的区别,包括在成像几何模型、方位向频率历程、距离徙动、天线扫描速度及方位向测绘带宽度、方位分辨率和回波方程等方面的区别,并通过对3种模式回波的模拟,进一步阐述了三者之间的区别.通过对条带SAR、聚束SAR和滑动聚束SAR的比较,可以看出条带SAR和聚束SAR都是滑动聚束SAR的特例.  相似文献   

Charge transport in conducting polyaniline co-doped with sulfosalicylic acid and dodecylbenzoyl sulfonic acid     

MA Li  YAN Jun  GAN Meng-Yu  HE Ling  LI Jian-Feng 《重庆大学学报(英文版)》2009,8(3):170-174

We prepared conducting polyaniline （PAn） co-doped with sulfosalicylic acid （SSA） and dodecylbenzoyl sultonic acid （DBSA） in micro-emulsive polymerization, and studied its charge transport behaviors based on the measurement of its electrical conductivity in the temperature range between 203 K and 298 K. The conductivity was found to increase with temperature, similar to the case in semiconductors. Analyzing the experimental data with three models, namely the charge-energy-limitedtunneling model, Kivelson model and the three-dimensional variable range hopping （3D-VRH） model demonstrated that these models all describe well the charge transport behaviors of PAn co-doped with SSA and DBSA within the mentioned temperature range. From calculation with the 3D-VRH model, the hopping distance of the conducting PAn is obviously larger than its localization length. The PAn doped with SSA and DBSA enjoys desirable crystallinity due to the co-doping of two functional sulfonic acids. The macroscopic conductivity may correspond to three-dimensional transport in the network of the bundles, and the metallic islands may be attributed to quasi-one-dimensional bundles.  相似文献   

论"合形"的构成方式     

邓红华 《湘南学院学报》2009,30(4):19-21

"合形"是一种汉字修辞方式,前人对它有较为深入的研究,但对其构成方式研究不够全面。汉字变化灵活多样,"合形"在"汉字+汉字"的主要构成方式外应当会存在一些变通,这样才能更好地体现汉字修辞的灵活性和多变性。  相似文献   

The differential effects of PNF versus passive stretch conditioning on neuromuscular performance     

《European Journal of Sport Science》2013,13(3):233-241

Abstract

The effects of flexibility conditioning on neuromuscular and sensorimotor performance were assessed near to full knee extension (25°). Eighteen males who were randomly assigned into two groups underwent eight weeks (three-times per week) of flexibility conditioning (hip region/knee flexor musculature; dominant limb) involving either proprioceptive neuromuscular facilitation (PNF) (n=9) or passive stretching (PASS) (n=9). Both modes of flexibility conditioning are popular within contemporary exercise and clinical settings and have demonstrated efficacy in improving range of motion. The contralateral limb and a prior ‘no exercise’ condition were used as controls. The PNF and PASS modes of conditioning improved passive hip flexibility to a similar extent (mean 19.3% vs. baseline, intervention limb, p<0.01) but did not alter knee flexor strength (overall mean 309.6±81 N) or sensorimotor performance (force and positional errors: 2.3±8.2% and 0.48±7.1%). Voluntary and magnetically evoked electromechanical delays (EMD_V and EMD_E, respectively) were increased but to a greater extent following PASS compared to PNF (PASS: 10.8% and 16.9% lengthening of EMD_V and EMD_E, respectively vs. PNF: 3.2% and 6.2%, p<0.01).The attenuated change to electromechanical delay (EMD) performance during PNF conditioning suggests a preserved capability for rapid muscle activation, which is important in the maintenance of dynamic joint stability. That PNF was also equally efficacious in flexibility conditioning would suggest that this mode of flexibility training should be used over passive to help preserve dynamic joint stability capabilities at this extended and vulnerable joint position.  相似文献   

Prophylactic effect of hot pack on symptoms of eccentric exercise-induced muscle damage of the wrist extensors     

《European Journal of Sport Science》2013,13(5):443-453

Abstract

This study investigated whether hot pack treatment could provide prophylactic effects on muscle damage induced by eccentric exercise of the wrist extensors. Twenty-eight healthy men (age 21±1 years, weight 65±16 kg, height 171±6 cm) were randomly placed into hot pack (n = 14) and control (n = 14) groups. All participants performed an exercise consisting of 300 maximal eccentric contractions of the wrist extensors of the non-dominant arm using an isokinetic dynamometer. A hot pack was applied for 20 min to the wrist extensors of the exercised arm before the exercise for the hot pack group. The control group received no treatment before the exercise. Measured variables included pain intensity assessed by a visual analogue scale and a modified Likert's scale, cold thermal pain threshold, pressure pain threshold (PPT), range of motion in active wrist flexion (ROM-AF) and extension (ROM-AE), range of motion in passive wrist flexion (ROM-PF) and extension (ROM-PE), grip strength, and wrist extension strength. Changes in these variables before, immediately after, and 1 to 8 days following the exercise were compared between groups by a two-way repeated measures ANOVA. All outcome measures from both groups (except for the cold thermal pain threshold of the hot pack group) demonstrated a significant change within the first 2–3 days following exercise. Significant differences between groups were only found at a single point in time for PPT, ROM-PF, ROM-PE and ROM-AE, and the changes were smaller for the hot pack group in comparison to the control group. These results suggest that the prophylactic effects of hot pack treatment on eccentric exercise-induced muscle damage of the wrist extensors are limited.  相似文献   

水利工程项目范围管理论略     

张振国 《大众科技》2013,(6):48-51

工程项目范围是指工程项目各过程的活动总和,或指组织为了成功完成工程项目并实现工程项目各项目标所必须完成的各项活动。工程项目的范围既包括其产品的范围,又包括项目范围,产品的范围指完成的单位工程、单项工程、建设项目,或它们的特征、功能及其测量评价结果的具体化;项目范围指为了交付满足工程项目产品范围要求的产品和服务所必须完成的活动总和。  相似文献   

Reference Ranges for Serum Total Cholesterol, HDL-Cholesterol, LDL-Cholesterol, and VLDL-Cholesterol and Triglycerides in Healthy Iranian Ahvaz Population     

Mohammad Taha Jalali  Abdolhosain Mosavi Honomaror  Abdolkarim Rekabi  Mahmod Latifi 《Indian journal of clinical biochemistry : IJCB》2013,28(3):277-282

Cardiovascular diseases (CVD) are recognized as major mortality causes and imposes tremendously heavy socio-economic burden worldwide. A vast variety of risk factors have been introduced in the literature known to enhance the incidence of CVD, such as hyperlipidemia. Therefore in order to make an accurate clinical decision it is essential to have appropriate reference ranges for lipids and lipoprotein particles in a particular population. Healthy female (n = 601) and male (n = 617) cases were randomly selected according to certain exclusion criteria from individuals visiting the major University hospital clinics situated in different part of Ahvaz city, Iran, from June 2010 to December 2010. Fasting blood samples (10 ml) were collected and analyzed for total cholesterol, total triglyceride and HDL-C employing enzymatic assays of CHOD-PAP, GPO-PAP and homogenous methods respectively. The samples were obtained such to include the ethnic populations of Persian, Arab. Lore leaving in this city. The data were analyzed statistically by SPSS-18 software. The obtained results were analyzed then age ethnic-wise and reference ranges (mean ± 1SD) were calculated. Remarkable differences between the obtained results for our population with other nations were seen. Also ethnic difference for HDL-C among our cases was noted. The observed significant differences among different nations and ethnicities emphasizes the need for nation-specific, local reference ranges for lipids and lipoproteins particles, to be established.  相似文献   

库克斯顿城堡     

《海外英语》2007,(4):8-9

城堡, 是欧洲典型的建筑之一, 每个城堡都有一个美丽的传说或是一段历史。从本期开始, 我们将推出“城堡之旅”, 带各位读者去浏览、观赏欧洲各地的城堡, 开始一段文化与历史的旅途!  相似文献   

用矩阵分块方法证明矩阵秩的一些性质     

吴旭 《甘肃广播电视大学学报》2003,13(3):45-47

利用矩阵分块方法，简洁、巧妙地给出了关于矩阵秩的4个结论的证明。  相似文献