Bakelite,a condensation product of phenols and formaldehyde,and its uses

Bakelite is a liquid compound of phenol and formaldehyde which on solidification resembles amber in appearance and when used in combination with wood, paper, asbestos, graphite and other substances produces a solid non-resistant, non-inflammable insulating material which promises to have many applications in various industries.     

Antioxidant-rich beetroot juice does not adversely affect acute neuromuscular adaptation following eccentric exercise

This study examined the effects of beetroot juice on the repeated bout effect (RBE) to eccentric exercise. Twenty-nine recreationally active males performed two bouts of 100-drop jumps, separated by 14–21 days. Using a double-blind, independent groups design, participants consumed either a higher dose beetroot juice (H-BT; 250 ml, n = 10), a lower dose beetroot juice (L-BT; 125 ml, n = 9) or an isocaloric placebo (PLA; 250 ml, n = 10) for 3 days after bout 1; no drinks were consumed after bout 2. Maximal isometric voluntary contraction (MIVC), countermovement jump (CMJ), pressure-pain threshold (PPT) and creatine kinase (CK) were measured pre, post, 24, 48 and 72 h following both bouts. In bout 2, CMJ and MIVC recovered quicker and CK activity was attenuated (versus bout 1) (P < 0.05) in all groups, demonstrating an RBE. At 24 h post bout 1, MIVC was 84.1 ± 16.1, 83.6 ± 11.6, 79.7 ± 15.1% relative to baseline values in the H-BT, L-BT and PLA groups, respectively; at 24 h post bout 2, MIVC recovered to 90.7 ± 13.7, 92.9 ± 6.9, 87.8 ± 6.9, in the H-BT, L-BT and PLA groups, respectively. These findings suggest that supplementation with antioxidant-rich beetroot juice does not adversely affect acute adaptations to a bout of eccentric exercise.     

以对话为学习策略的小学语文教学模式探索

以对话为学习策略的语文课堂教学模式旨在构建以“对话核心主题”为中心点、以“对话分主题”为线索、以“对话依托点”为具体内容的课堂操作程式。实验研究表明,实验班学生对语文课学习的兴趣明显提高,语文“双基”得到较好的落实,并拓展了学生思维的广度与深度,激发了学生的创新意识,提升了学生的学习能力。     

关于课程哲学基础的思考

课程与哲学的关系十分密切,一方面,哲学制约着课程观的产生、发展和变革;另一方面,课程在哲学面前具有能动性、选择性。把马克思主义实践哲学应用于课程研究,作为课程论的哲学基础,满足课程发展的要求,建立实践课程论,这是课程理论和实践发展的必然。用实践哲学审视课程历史,探究课程本质,反思课程问题,把握课程规律及其特点,是实践课程论应研究的主要问题。