Investigation of heat sink of endothermic hydrocarbon fuels

Endothermic hydrocarbon fuels are advanced coolants for high-temperature structures of spacecraft. No data of tested-cooling-ability of endothermic fuels have been broadly discussed in literature. In this work a high-temperature flow calorimeter was designed, and the cooling capacity of six different hydrocarbon fuels were measured. Experimental results showed that these hydrocarbon fuels have capacity for cooling high-temperature structures, and that the cooling capacity of fuel N-l can reach 3.15 MJ/kg, which can nearly satisfy the requirement of thermal management for a Mach 3 cruise aircraft, whose heat sink requirement is about 3.5 MJ/kg. The endothermic velocity of hydrocarbon fuels was also measured by the calorimeter.     

师生冲突的概念界定与分类探究——基于刘易斯·科塞的冲突分类理论

论文通过借鉴和辨析社会学理论中的冲突概念,对师生冲突概念作出界定。根据美国当代社会学家刘易斯·科塞的冲突分类理论,对学校师生冲突进行分类研究。在此基础上提出了三个观点:学校师生冲突的多数属于非现实性冲突;师生结构由紧密走向松散是师生冲突增多的重要原因;师生冲突具有一定的正面功能。     

浅谈提高森林公安队伍素质的途径

目前,森林公安队伍有半数以上民警未受过高等教育,随着我国生态文明建设进程的不断推进,将难以适应森林公安工作任务的需要。提高森林公安队伍素质,要加强森林公安民警的学历教育,加强业务技能培训,促使民警不断学习新知识、新技术,适应形势发展需要,跟上时代的步伐。     

我国现阶段的电子商务状况研究

90年代初电子商务概念开始在我国传播,1998年3月我国第一笔互联网网上交易成功,到2005年我国电子商务交易额达7400亿元,我国的电子商务已经从概念讨论进入到务实发展阶段。现阶段我国电子商务的法律政策环境不断完善,电子商务的安全认证标准逐步形成,电子商务国家标准体系正在建立和完善,电子支付环境得到了进一步改善,网络银行的发展及相关法律法规的制定营造了良好的网络环境,电子商务的物流体系也在不断完善。     

Self-Similar Solutions for a Class of Reaction-Diffusion Systems

ＳｅｌｆＳｉｍｉｌａｒＳｏｌｕｔｉｏｎｓｆｏｒａＣｌａｓｏｆＲｅａｃｔｉｏｎＤｉｆｕｓｉｏｎＳｙｓｔｅｍｓＧｕｏＰｅｉｆａｎｇ（郭佩芳）（ＤｅｐａｒｔｍｅｎｔｏｆＡｐｐｌｉｅｄＭａｔｈｅｍａｔｉｃｓ，ＳｏｕｔｈｅａｓｔＵｎｉｖｅｒｓｉｔｙ，Ｎａｎ...     

深刻把握“三个代表”重要思想的哲学基础

江泽民同志提出并系统阐述的“三个代表”重要思想，是我们党的立党之本，治国之基，力量之源，是当代中国马克思主义理论发展的最新成果。本探讨了“三个代表”重要思想形成的新的实践基础，分析了这一重要思想是在我们党和国家所面临的伟大历史转折时期，在复杂多变的国际形势的特定历史背景下形成的。章还探讨了“三个代表”重要思想立论的哲学基础。     

Promoting cognitive and social aspects of inquiry through classroom discourse

We investigated how Chinese physics teachers structured classroom discourse to support the cognitive and social aspects of inquiry-based science learning. Regarding the cognitive aspect, we examined to what extent the cognitive processes underlying the scientific skills and the disciplinary reasoning behind the content knowledge were taught. Regarding the social aspect, we examined how classroom discourse supported student learning in terms of students' opportunities to talk and interaction patterns. Our participants were 17 physics teachers who were actively engaged in teacher education programs in universities and professional development programs in local school districts. We analyzed one lesson video from each participating teacher. The results suggest both promises and challenges. Regarding the cognitive aspect of inquiry, the teachers in general recognized the importance of teaching the cognitive processes and disciplinary reasoning. However, they were less likely to address common intuitive ideas about science concepts and principles. Regarding the social aspect of inquiry, the teachers frequently interacted with students in class. However, it appeared that facilitating conversations among students and prompting students to talk about their own ideas are challenging. We discuss the implications of these findings for teacher education programs and professional development programs in China.     

延续性护理对脑卒中患者知信行的效果研究

目的:探讨延续性护理干预对脑卒中患者知信行(KAP)功能康复的效果。方法:选择我院神经内科收治的脑卒中患者110例,随机分为对照组和干预组各55例。对照组采用神经内科常规护理,干预组在常规护理基础上联合延续性护理干预,通过对脑卒中患者的知识、态度及行为,比较两组的护理效果。结果对照组和干预组患者知信行问卷的总体得分,比较差异有统计学意义(P<0.05)。结论:通过延续护理干预方式对脑卒中患者的知信行功能康复起到治疗作用,纠正不当的生活行为,提升日常生活能力,明显改善康复锻炼的依从性。     

Safety of protease inhibitors and Arbidol for SARS-CoV-2 pneumonia in Zhejiang Province,China

The aim of this study was to evaluate the safety of an antiviral regimen of protease inhibitors combined with Arbidol (umifenovir) for severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) pneumonia patients. The genomic sequence of SARS-CoV-2 is highly homologous to that of SARS-CoV (Zhou et al., 2020). Previously published basic and clinical research on anti-SARS-CoV treatment found that lopinavir/ritonavir (LPV/r) could improve the prognosis of SARS patients (Chan et al., 2003; Chu et al., 2004). Darunavir (DRV) is another protease inhibitor that blocks the binding of SARS-CoV-2 to human angiotensin-converting enzyme 2 (Omotuyi et al., 2020). The broad-spectrum antiviral drug Arbidol (umifenovir) also shows in vitro anti-SARS-CoV activity (Khamitov et al., 2008).     

弹性有限长度杆在轴向应力波传播和反射过程中的屈曲

讨论弹性有限长度杆端部受冲击载荷作用，在轴向应为波传播和反射过程中的动态屈曲问题．利用扰动方程的解、端部支承条件和应力波反射前后波阵面相容条件得到了动态屈曲的分叉条件，临界载荷和屈曲模态．数值结果表明：临界载荷有多个分支且随时间增加而降低；由于应力波在端部的反射，使临界载荷进一步下降．这个结果就解释了实验中的一些现象．