Results 81 to 90 of about 2,125,466 (224)
Dianci bileiqi, 2011 提供了一种用蒽醌显色法判定金属氧化物电阻片用氧化锌原料中金属锌的定性分析方法。采用有机试剂蒽醌在一定浓度的碱性溶液中,在水浴加热下与金属锌反应生成一种红色的络合物,根据反应后生成络合物的红点数量,来判断氧化锌中是否含有金属锌。与传统的盐酸溶解法相比,该方法操作简单,反应现象明显直观,易于观察,判断准确。该方法具有在氧化锌原料生产厂家、金属氧化物电阻片生产厂家和压敏电阻生产厂家推广使用的价值。
李越, 王兰义, 徐学亭
doaj
International Journal of Applied Linguistics, EarlyView.ABSTRACT Collaborative writing has attracted increasing attention in English as a Foreign Language (EFL) instruction due to its potential to enhance learners’ writing competence. However, few studies have examined the comparative effects of collaborative versus independent writing on EFL learners’ individual performance, especially in higher‐order ...
Ting Huang, Chenze Wu, Wenkang Zhang
wiley +1 more source
, 2014 本发明提供了一种以镍碳化钨催化剂为主的连续催化转化纤维素原料生产至少一种多元醇的方法。该方法涉及将氢气、水、纤维素类原料与催化剂连续作用，从而生产包括至少一种多元醇流出液 ...
张涛 +7 more
core
Gongye shui chuli, 2002 对氟化铝生产废水的处理方法进行了研究。结果表明,一级中和沉淀法和二级中和二级沉淀法均不宜用于氟化铝生产废水的处理,理想的处理方法是碱过量中和酸回调法,辅加氯化钙的石灰乳中和法也可考虑采用。
谢祖芳, 陈孟林, 何星存
doaj
International Journal of Applied Linguistics, EarlyView.ABSTRACT With the increasing number of Chinese international students in Australian universities, intercultural competence has become a critical factor influencing their interactions with Australian tutors in university classroom settings. Existing research often examines students’ intercultural competence from a single‐method or single‐perspective ...
Jiangyu Han, Linda Tsung
wiley +1 more source
, 2008 一种光催化制氢过程中抑制一氧化碳生成的方法，光催化剂上担载一种助催化剂，以有效抑制光催化过程中一氧化碳的生成；该助催化剂由IB金属、Ⅷ金属和/或其氧化物之一或其组合构成。本发明还可以在光催化重整甲醇或生物质衍生物反应液中加入添加剂，以有效抑制光催化过程中一氧化碳的生成；该添加剂为含NO3-、CO32-、HCO3-、ClO4-、 PO43-、HPO42-、H2PO4-、SO42-、HSO4-、F-、Cl-的酸或盐之一或其组合。本发明适用于多种光催化体系，操作简单，在不降低光催化剂产氢活性的前提下 ...
吴国鹏 +6 more
core
International Journal of Applied Linguistics, EarlyView.ABSTRACT One key strategy that local universities and the government of Hong Kong have adopted in recent years is attracting more students from Chinese Mainland to study at Hong Kong's higher education institutions and contribute to society after graduation.
Lingnan Zhang, Yue Peng
wiley +1 more source
, 2005 一种化学键合手性固定相及其制备方法，其特征在于使用糖肽类大环抗生素-去甲万古霉素作为手性选择剂，通过化学键合的方法将其键合于载体上。本发明适合于用作高效液相分离用色谱填料。所制得的固定相具有很强的手性识别能力和很好的稳定性能，可对多种不同类型的手性药物实现分离 ...
王俊德, 刘莺, 丁国生
core
Gongye shui chuli, 2009 焦化废水含有大量有机污染物和有毒无机物,成分复杂,污染物色度高,属较难生化降解的高浓度有机工业废水。经常规方法预处理,再经生化处理后的焦化废水存在氰化物、COD及氨氮等不达标的问题。通过臭氧氧化法、Feton试剂氧化法以及光催化氧化法等高级氧化法,活性炭以及矿物吸附法等三级深度处理可以解决这一问题。介绍了目前焦化废水深度处理的研究进展并进行了展望。
于开宁, 王程, 李艳, 张璞
doaj
International Journal of Applied Linguistics, EarlyView.ABSTRACT Gamification has been increasingly implemented for language learning purposes across the globe. However, there remains unknown regarding how the change in gamification design might maximize students’ language learning outcomes and engagement.
Shen Qiao +2 more
wiley +1 more source