对我国电子商务存在的问题的分析   总被引：2，自引：0，他引：2  

徐姣 《现代情报》2002,22(1):16-16,11

经调查发现，在理念上并不落后的中国电子商务，在现实中却有着显著的弱点，阻碍了中国电子商务的正常发展。本文主要阐述和分析了我国电子商务发展薄弱的一些原因。  相似文献   

高校辅导员在大学生心理危机干预中的角色定位思考     

徐姣 《南昌教育学院学报》2015,(2):50-51,54

大学生心理危机的预防与处理过程中,虽然应以专业的危机干预人员为主,但与学生朝夕相处,有着丰富管理学生工作的实践经验的辅导员,在大学生心理危机干预方面却具有独特的优势和地位。因而要充分发挥其在心理危机干预中的优势,使他们准确把握自身在大学生心理危机干预工作中的角色定位,对大学生的心理危机进行有效的干预,对促进大学生的身心健康与成长成才有着重要的意义。  相似文献   

Separation of benzoic acid residue by flash-vacuum distillation-melt crystallization     

徐姣  张卫江  杨焘  焦书军  胡雪东 《天津大学学报(英文版)》2009,15(4):288-293

A large amount of residue including benzoic acid, benzyl benzoate and fluorenone can form in the production of benzoic acid by oxidizing toluene. To recycle the resources and reduce secondary pollution, the treatment of benzoic acid residue was carried out to obtain the three purified materials by flash-vacuum distillation combination method, and the influence of the operating parameters, such as the top pressure, reflux ratio and top and bottom temperatures was investigated to obtain the best operating conditions. The experimental results show that the benzoic acid purity can reach 97% through distillation under the following conditions: the top pressure is 1 600 Pa, the bottom temperature is 190–200 °C, the top temperature is 130–135 °C, and reflux ratio is 5:1. The best operating conditions for benzyl benzoate distillation column are: the top pressure is 400 Pa, bottom temperature is 250–260 °C, the top temperature is 150–160 °C, and reflux ratio is 5:1. The benzyl benzoate purity can reach 95% and the fluorenone purity can reach 92%. When refined by melt crystallization, the benzoic acid purity can be improved up to 99.6%, and the purities of benzyl benzoate and fluorenone are both above 95%.  相似文献   

对高校辅导员队伍建设问题的研究   总被引：1，自引：0，他引：1  

边疆  徐姣 《教书育人》2008,(33)

随着经济全球化、一体化进程的加速,世界范围内的各种思想文化涌入中国,其中包括西方腐朽思想的渗透和文化冲击,对大学生的成长成才造成了巨大的障碍。因此,在新形势下与时俱进,加强和改进大学生思想政治教育就显得尤为紧迫而重要。高校辅导员是大学生  相似文献   

关于我国高校人文素质教育问题的思考     

徐姣 《黑龙江教育》2008,(1):15-16

人文精神反映了人的内在价值和社会的普遍正义,是大学教育的灵魂。因此,高等院校的人文素质教育,是顺应时代创新潮流的一项重要战略举措。但是,目前人文素质教育的实践中却存在缺陷。为了改变这种状况,高等院校应该针对高校人文素质教育中存在的问题,提出行之有效的对策,开拓人文素质教育的新视野。  相似文献   

由2023年全国Ⅰ卷高考数学谈高三复习备考     

徐姣 《数理天地(高中版)》2023,(23):43-44

2023年全国Ⅰ卷高考数学试题全面贯彻五育并举的教育方针,精准落实立德树人根本任务以及“一核四层四翼”的重要思想,突出对学生关键能力和数学核心素养的考查.高中教师应深刻分析试题的基础性、综合性、应用性和创新性进行科学高三复习备课.本文通过部分创新试题评析来谈高三复习备考.  相似文献   

构建良好网络“平台”提高美术课堂效益——浅谈小学美术专题教学网站的构建与运用     

徐姣  朱成 《中小学电教》2012,(5)

一、“平台”的产生——小学美术专题教学网站产生的必然性 美术课程的改革，不仅是教材的改革，内容的改革，还是教学过程和教学方法的改革。它强调以学生探索发展、自主学习为主。改变了以往美术教科书以美术知识结构为框架的体系．采用以大单元的形式编排，通过各种丰富多彩的活动来体现同一个主题。特别是到了小学高年级阶段，在美术课程中往...  相似文献   

离一高二学生如何有效做好英语高考备考     

徐姣 《成才之路》2013,(1):59-59

本人从事高中英语教学已有十几年,进行了三、四轮的大循环教学,觉察到学生存在一个普遍问题——那就是学生的高考备考意识形成较晚。他们往往到了高三才真正进入高考备考状态,而高一、高二时没有全面夯实基础知识,遇到综合能力运用题时学生一下子束手无策,变得很茫然。什么时候开始进行有效的英语高考备考呢？我想最好应该从高一、高二开始就要全面地循序渐进地进行听力、  相似文献   

Preparation and characterization of high purity enriched <Superscript>10</Superscript>B boric acid via anti-solvent recrystallization     

张卫江  刘天雨  徐姣 《天津大学学报(英文版)》2016,22(3):279-283

Self-made enriched ¹⁰B boric acid as raw material was purified by recrystallization. The effects of final crystallization temperature, crystallization time, stirring speed, crystallization frequency and other factors on the purity were investigated. The appropriate operating condition was that the final crystallization temperature and time were 5°C and 10 h respectively under a low-speed stirring for crystallizing twice, which would make the purity and yield of boric acid reach 99.94% and 95.36%, respectively. Taking this as foundation, recrystallization process was optimized with acetone as anti-solvent, whose amount was the most important index. The boric acid solution was added into acetone and recrystallized under the same condition, and the purity and yield of boric acid would reach 99.98% and 99.61%, respectively. The product detected by XRD was confirmed as boric acid crystal. Main ion concentration in the product was detected by ICP, which basically met the national standard of high purity. Crystal morphology of boric acid was observed by SEM.  相似文献   

Preparation of Boric-10 Acid Applied in Nuclear Industry     

张雷  张卫江  徐姣  李波 《天津大学学报(英文版)》2015,(2):172-177

Because of the superior features of boron-10 isotope in absorbing hot neutrons, boric-10 acid(H310BO3)has been used widely in nuclear industry. Boric-10 acid is obtained from boron-10 trifluoride(10BF3) by esterification and hydrolyzation. In this study, trimethyl borate-10 [(CH3O)310B] was prepared from boron-10 trifluoride(10BF3)through chemical exchange rectification. In addition, the hydrolyzation of trimethyl borate-10 was investigated with different p H values, temperatures and molar ratios of water to trimethyl borate-10. Under the optimum process conditions, high yield of boric-10 acid with nuclear industrial purity grade was realized.  相似文献