教师对新课改阻抗的现状、原因和对策

教师是决定新课改成败的关键因素之一,然而,目前尚有许多教师对新课改采取抵抗的态度。本文分析了教师阻抗新课改的现状、原因,并提出了消除教师阻抗的策略。     

新怨恨理论视域下的巴金小说重读

"怨恨"是21世纪巴金研究的新判断,是巴金小说文化反思的现代性体验。巴金不但反抗与怨恨中国传统的诸多弊端,同时也反抗与怨恨西方现代文化的诸多弊端;巴金小说的怨恨体验不但表现为反抗中的怨恨,同时体现为建构中的怨恨与回瞥中的怨恨。     

负重振动训练对下肢快速力量的影响及其神经适应的特征

摘要：目的：研究8周负重振动训练对快速力量和下肢肌肉H反射的影响并探讨其可能的机制,以此丰富和完善负重振动训练的理论体系,并为普通人群和运动员振动力量训练方案的制定提供参考。方法：以16名男性田径专修大学生为研究对象,随机分为常规力量训练组（常规组）和振动力量训练组（振动组）。常规组完成30%1RM负重半蹲起训练,振动组附加振幅为2 mm、频率50 Hz的振动刺激,完成相同负重半蹲起训练。8周训练前后测定半蹲跳、原地纵跳和腓肠肌H反射。结果：常规组和振动组组内相对快速力量指数、原地纵跳绝对腾空高度和弹性能利用率均显著提高（P<0.05)。2组间相对快速力量指数、原地纵跳绝对腾空高度和弹性能利用率增加值均有显著性差异。组内H反射潜伏期和Hmax/Mmax减小且差异具有显著性;仅振动组H反射突触前抑制（PSI）升高且具有显著性。组间H反射潜伏期、Hmax/Mmax、PSI有显著性差异。结论：8周附加振动刺激的负重30%1RM力量训练对快速力量的提高优于相同负重的常规力量训练。8周负重振动力量训练的神经适应特征表现为H反射潜伏期、Hmax/Mmax下降和PSI的增强。     

Venice Biennale: The Art of Communicating Resistance,Resistance as Art

ABSTRACT

This essay examines contemporary art as a tool of political resistance against existing and emerging ideologies as well as controversial and discriminatory cultural norms. On the example of the 2017 Venice Biennale, this research project analyses art, and more specifically, selected nation-specific exhibits, as pieces of critical pedagogy, representative of ideological and cultural resistance. Concentrating on the comparative analysis of art exhibits from US-American, Russian, and German national pavilions, this research project explains what their respective art communicates, what the main messages are, and elaborates on the impact, the salience, and the affect the exhibits have on their numerous audiences today, when the sphere of international and intercultural relations is challenged like never before. This essay further demonstrates that the exhibits challenge and critique the past and the present of their respective national cultures and attempt to refocus and humanize the future in the globalized world.     

Stone consolidation: The role of treatment procedures

Four types of carbonate stones and three consolidation products were used in a systematic study to assess the influence of the application procedures on the amount of product applied, as a primary step to evaluate consolidation treatments. Microdrilling, ultrasonic velocity and flexural resistance were used as performance indicators. The amount of product of a specific treatment and its action depend on the application procedures, both when the treatments are carried out in the laboratory and on site. The results are expected to contribute to the standardisation of testing protocols on stone consolidation.     

The metabolic and temporal basis of muscle hypertrophy in response to resistance exercise

Constituting ～40% of body mass, skeletal muscle has essential locomotory and metabolic functions. As such, an insight into the control of muscle mass is of great importance for maintaining health and quality-of-life into older age, under conditions of cachectic disease and with rehabilitation. In healthy weight-bearing individuals, muscle mass is maintained by the equilibrium between muscle protein synthesis (MPS) and muscle protein breakdown; when this balance tips in favour of MPS hypertrophy occurs. Despite considerable research into pharmacological/nutraceutical interventions, resistance exercise training (RE-T) remains the most potent stimulator of MPS and hypertrophy (in the majority of individuals). However, the mechanism(s) and time course of hypertrophic responses to RE-T remain poorly understood. We would suggest that available data are very much in favour of the notion that the majority of hypertrophy occurs in the early phases of RE-T (though still controversial to some) and that, for the most part, continued gains are hard to come by. Whilst the mechanisms of muscle hypertrophy represent the culmination of mechanical, auto/paracrine and endocrine events, the measurement of MPS remains a cornerstone for understanding the control of hypertrophy – mainly because it is the underlying driving force behind skeletal muscle hypertrophy. Development of sophisticated isotopic techniques (i.e. deuterium oxide) that lend to longer term insight into the control of hypertrophy by sustained RE-T will be paramount in providing insights into the metabolic and temporal regulation of hypertrophy. Such technologies will have broad application in muscle mass intervention for both athletes and for mitigating disease/age-related cachexia and sarcopenia, alike.     

肥胖的产生机制及研究进展

肥胖是一种危害人类健康的慢性疾病。肥胖的产生受多种因素的影响,其主要调节机制包括基因、生理和行为因素。近几年,肥胖基因及其产物瘦素、解耦联蛋白、!3-肾上腺素受体等分子在生物学方面的研究取得很大进展。胰岛素抵抗、高胰岛素血症、脂肪组织及脂肪细胞的特征也引起学者们的广泛重视。本文对于肥胖机制研究中有代表性和一定影响的几种学说进行了综述。     

糖尿病、运动与血清视黄醇结合蛋白4关系的综述

通过文献法综述了糖尿病、运动与血清视黄醇结合蛋白4（RBP4）的关系。结果表明：胰岛素抵抗是2型糖尿病发生发展的重要因素之一。RBP4作为一个脂肪细胞来源的信使,与胰岛素抵抗和2型糖尿病密切相关,RBP4在2型糖尿病胰岛素抵抗机制中起重要作用。血清中RBP4水平的升高可能是导致高胰岛素血症的原因之一,RBP4可能影响胰岛素的敏感性。RBP4削弱骨骼肌的胰岛素信号通路是通过胰岛素受体底物的磷酸化实现的。运动手段是治疗2型糖尿病的主要方法,运动能够降低血清RBP4水平,改善胰岛素抵抗和脂代谢。     

不同氟浓度涂膜对乳牙牙釉质抗酸性的影响

[目的]确定三种浓度氟涂膜对乳牙牙釉质抗酸性的影响.[方法]乳牙45个,随机分为3组,开窗,分别涂布2000ppm、5000ppm、10000ppm氟涂膜,随后置入脱矿液中脱矿24h,然后测量酸蚀液中钙的溶出量,并进行统计学分析.[结果] 10000ppm组与5000ppm组、2000ppm组的抗酸性有差别,P<0,05;而5000ppm组与2000ppm组之间无差别,P>0,05.[结论]10000ppm的含氟涂膜抑制牙釉质脱矿的效果比5000ppm及2000ppm的氟涂膜好,所以临床应用时可考虑含氟浓度为10000ppm的氟涂膜.     

浅谈电源电动势和内阻的测量方法

用伏安法测电源电动势和内阻是一种常用方法,由于表内阻的影响,实验的系统误差较大。本文根据电势差计原理,用补偿法测电源电动势和内阻,就能比较准确地进行测量,消除了表内阻影响带来的系统误差。