基于雨课堂的混合式教学在铁路施工组织与概预算课程中的应用

针对“互联网+教育”背景下传统课堂教学学生能动性差、师生互动有限、知识考核为主等诸多问题,信息化教学为课堂革命提供指导方向,混合式教学模式现已成为教育界广泛倡导的一种全新教育理念。从铁路施工组织与概预算课程教学现状入手,分析混合式教学模式构建路线和雨课堂对教学活动的支撑,构建基于PDCA循环的三段十步混合式教学模式,并以双代号网络图绘制为应用案例阐述基于雨课堂的三段十步教学活动实施过程。结果表明:借助雨课堂这一智能化教学工具实施课前-课中-课后教学环节,不仅激发学生学习积极性与学习热情,明显提升课堂参与度,还迅速提升教师教学信息化水平和课堂教学水平。     

Lipid composition and amino acid uptake during rotavirus infection and protection with trypsin inhibitor in malnourished infant mice

The aim of the study was to evaluate the influence of rotavirus (RV) and soyabean trypsin inhibitor (TI) on lipid composition and uptake of glucose and glycine in rotavirus (RV) infected malnourished (PEM) infant mice. Malnutrition was achieved in animals by doubling the litter size. Cholesterol (Ch) and phospholipd (PL) contents, uptake levels of glucose and glycine were determined in jejunum and ileum portion of small intestine. Increase in Ch/PL ratios was observed in PEM+RV group. The levels became comparable in PEM+RV+TI as compared to PEM. Uptake levels of glucose and glycine increased in PEM animals. With rotavirus (PEM+RV+TI group), the levels decreased which became comparable to PEM. Changes in uptake and lipid composition with rotavirus and trypsin inhibitor may be responsible for altering membrane fluidity and organization during rotavirus diarrhea. The results establish the importance of trypsin inhibitor during oral infection with rotavirus.     

试论集蓄雨水的所有权

雨水集蓄利用是一项被广泛应用的传统技术,尤其在当今,对节约,合理利用水资源,解决干旱缺水地区的生活、农业用水具有重要意义.但时至今日,关于集蓄雨水的所有权的法律规定还几近空白.因而确定其所有权归属,成为雨水资源利用之必须,也为法律完善之必要.     

透明质酸在化妆品中的应用

透明质酸是具有特殊功能的一种线性大分子粘多糖，具有独特的保湿性能。它是构成皮肤细胞间质和细胞外基质的主要成分，具保水作用及高效的自由基“清道夫”的作用等。透明质酸作为一种理想的天然保湿因子，广泛应用于化妆品中。     

石家庄市浅层地下水中硝酸盐氮污染现状及原因分析

随着工业化和城镇化建设的推进，石家庄市区的浅层地下水中硝酸盐氮污染日趋严重．通过现场采样、分析、测试，反映市区的污染现状，探讨其污染原因，并提出相应防治措施．     

3-甲基-2-氧代丁酸的分离提纯工艺研究

以3-甲基-2-氧代丁酸的收率及纯度为目标函数,对三种分离以3-甲基-2-氧代丁酰甲酯水解所得到的3-甲基-2-氧代丁酸的工艺进行了对比实验,确定了较为经济的分离工艺,采用单因素实验与正交试验优化了分离提纯的工艺条件,先将3-甲基-2-氧代丁酰甲酯在碱性条件下的水解液直接用盐酸酸化,选择合适的有机溶剂萃取,减压浓缩得到3-甲基-2-氧代丁酸粗品,将粗品再进行分子蒸馏精制,得到纯度不小于98%的精品3-甲基-2-氧代丁酸晶体（温度〈10℃）。     

Mapping of quantitative trait loci for fiber and lignin contents from an interspecific cross Oryza sativa×Oryza rufipogon

Rice straw is always regarded as a by-product of rice production, but it could be a significant energy source for ruminant animals. Knowledge of the genetic variation and genetic architecture of cell wall traits will facilitate rice breeders by improving relevant traits through selective breeding and genetic engineering. The common wild rice, Oryza rufipogon Griff., which is considered to be the progenitor of Oryza sativa, has been widely utilized for the identification of genes of agronomic importance for rice genetic improvement. In the present study, the mapping of quantitative trait loci (QTLs) for acid detergent fiber (ADF), neutral detergent fiber (NDF), acid detergent lignin (ADL), and ADL/NDF ratio was carried out in two environments using a backcrossed inbred line (BIL) population derived from a cross between the recurrent parent Xieqingzao B (XB) and an accession of Dongxiang wild rice (DWR). The results indicated that all four traits tested were continuously distributed among the BILs, but many BILs showed transgressive segregation. A total of 16 QTLs were identified for the four traits, but no QTLs were in common in two environments, suggesting that environment has dramatic effects on fiber and lignin syntheses. Compared to the QTL positions for grain yield-related traits, there were no unfavorable correlations between grain yield components and cell wall traits in this population. The QTLs identified in this study are useful for the development of dual-purpose rice varieties that are high in grain yield and are also high in straw quality.     

移动互联环境下数据库原理混合式教学研究

数据库技术是当代信息社会的重要基础技术,是目前热门的大数据分析的基础。作为计算机专业的学生,学习并全方位掌握数据库原理技术非常重要。本文分析了当前数据库原理课程教学中存在的一些问题,结合移动互联网络,提出了线上线下相融合的数据库原理混合式教学策略来提高教学效果。     

基于雨课堂平台的“线性代数”教学创新实践

基于雨课堂与传统课堂相结合的“线性代数”课程线上线下混合式教学模式。运用雨课堂和传统课堂相结合的授课方式,教师充分利用线上资源,课前、课后推送教学资源,平台记录整个教学过程,为课堂的教学组织和课程考核提供了参考依据。同时,创新性地提出了教学评价过程化,增加教学评价的维度,教育信息化、数据化使教学评价更加科学、客观与公正。新的教学模式与评价体系推动了教学以教师为中心向以学生为中心的转变。此外,教学内容中体现了科学性和应用性,融入思想政治教育元素,帮助学生了解中国传统文化和中国科学技术,既培养了学生爱国情感,又发展了学生数学应用思维。