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英国一家报纸举办一项高额奖金的有奖征答活动。题目是——
在一个充气不足的热气球上。载着三位关系人类兴亡的科学家，热气球即将坠毁，必须丢出一个人以减轻载重。三个人中，一位是环保专家，他的研究可拯救无数生命因环境污染而身陷死亡的噩运；一位是原子专家，他有能力防止全球性的原子战争，使地球免遭毁灭；一位是粮食专家，他可以让数以亿计的人们脱离饥饿。 相似文献
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吴碎锡 《教学月刊(中学下旬版)》2007,(8):61-63
一、两个教学案例 案例1一锤定音 笔者曾听过一位教师执教的八年级科学公开课，课题是《空气的污染与保护》，这个班级共有38位学生，教师将学生分成“环保研究组、环境检测组、医学研究组、科研组、政府官员组、社会公民组”6个小组，每个小组6位学生，另选2位成绩好的学生当“小专家”，小专家面向学生坐在讲台位置，下面是这节课的一个片段。 相似文献
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王星光 《河南师范大学学报(哲学社会科学版)》1994,(4)
苏颂的科学技术成就王星光苏颂是我国宋代著名的科学家。他既是一位学识渊博、成绩斐然的科技专家，又是一位善于规划和领导重大科技工程的出色组织者；无论作为著名的医药学京还是作为杰出的天文学家，他都是当之无愧的。英国著名科学史专家李约瑟曾评价道：“苏颂是中国... 相似文献
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对于每一位有事业心的教师来说，都想通过自己不懈的努力成为一名教学专家。通过对教学观念和教学行为过程全面地、客观地分析和思考，进行自我调整，从而提高课堂教学的质量。那么，怎样才能成为一位专家教师呢? 相似文献
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张正东教授访谈录 总被引：4，自引：0，他引：4
包天仁 《通化师范学院学报》2004,(3):15-18
今年《基础教育外语教学研究》杂志开设了“专家访谈”栏目，从第一期到十二期推出名家系列专访。目前已经采访了桂诗春、马俊明两位专家，您是我采访的第三位专家，还要再采访九位专家。今年就推出十二期。明年计划采访一些国内学或专访国际名同行专家学。为什么要推出这个栏目呢?目前我国的基础教育改革已 相似文献
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柳湘莲是《红楼梦》中的小人物,他的身份和经历都具有传奇色彩。他被人误认作“优伶”,但他品行高洁,自尊自爱,是一个特立独行的游侠;他的出家是由于自责和救赎的需要。柳湘莲形象的塑造是曹雪芹对主流文化的一种质疑和反叛。 相似文献
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史学界曾对林肯是否为废奴主义比较热烈的争论，形成了三种观点：一、林肯是废奴主义；二、林肯开始不是废奴主义，只是反对奴隶制，后来才逐步转变为废奴主义；三、林肯完全不是废奴主义，甚至还反对废奴主义。笔认为，林肯不仅一开始就把废除奴隶制作为,而且坚定不移地以实现此目标为己任，有步骤地开展斗争，并最终领导美国人民彻底消灭了奴隶制。 相似文献
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学者行会的成员资格——中世纪大学教师录用的历史考察 总被引：1，自引：0，他引：1
中世纪大学具有浓厚的行会色彩,因此,作为学者行会的中世纪大学在其组织成员资格的确认上有其独特的制度逻辑。在中世纪,获得学位既是对申请者学术经历和学术能力的标识和认可,更是申请者获得学者行会的成员资格、进而开张授业的必备条件。学位的申请和获得有着严格的标准和程序,并伴随着隆重的仪式。 相似文献
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官方贸易在古代中日经贸交往中占据主导地位。综观古代中日官方贸易，其总体特点大致有以下数端：它实质上是一种朝贡贸易；对于当时的中华帝国来说，是一种厚往薄来的不等价贸易；以两国的政治需要为前提，带有浓厚的政治色彩；往往伴随着广泛的人才和文化交流。 相似文献
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In this paper, an experimental study of an air inflated membrane was carried out based on the China National Stadium （the Bird＇s Nest）. After the 2008 Olympic Games, it was apparent that the future use of the Bird＇s Nest would be enhanced if rainfall could be prevented from entering the stadium. The installation of an air inflated membrane across the opening of the steel structure was proposed as a solution to this problem. To verify the scheme, a theoretical analysis and experimental study of an air inflated membrane was carried out. Experimental and computational models were developed, form-finding was carried out using both experimental and theoretical methods, and the results from the two approaches, including the deflection of the air inflated membrane and deformation of the support structure, were analyzed and compared. The force-transfer path and deformation of the air inflated membrane under loads was studied. Conclusions and suggestions are presented. 相似文献
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Xiao-jie Xie Ju-bo Jiang Jun Jiang Jian-an Wang 《Journal of Zhejiang University. Science. B》2014,15(9):838-844
Based on different mechanisms of blood coagulation, coexistence of venous thromboembolism and arterial thrombosis in a single individual is extremely rare in clinical practice. Both antiplatelet and anticoagulation therapy should be adopted for patients with arteriovenous embolism. Balancing the risk of ischemia and hemorrhage is especially challenging in these patients in order to achieve an optimal clinical benefit. We report on a 55-year-old female with acute pulmonary embolism (PE), subsequently diagnosed as having acute myocardial infarction (AMI) and a cerebral infarction. Examinations had been carried out, excluding potential arteriovenous shunts, cancer, antiphospholipid syndrome and other common hypercoagulable states. A combination of an anticoagulant drug (rivaroxaban, an Xa inhibitor) and an antiplatelet agent (clopidogrel, an ADP receptor inhibitor) was prescribed with a β-blocker and atorvastatin. The embolus was gradually shrunk during the next 10 months, and then it turned back into expanding. During the 16 months’ follow-up, an aneurysm of left ventricular apex was found through an echocardiogram and an angiotensin-converting enzyme inhibitor was administered. We conclude that combined anticoagulation and antiplatelet therapy significantly relieved the symptoms and improved the prognosis in patients suffering from arteriovenous embolism without any major clinical bleeding events. 相似文献
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Syntax has been noted to play an important role in word learning in English; it distinguishes the fundamental conceptual difference between individuals (coded as proper nouns), nonindividuals (coded as mass nouns), and classes of individuals (coded as count nouns). The Japanese language does not have grammatical markers flagging the distinctions between count nouns and mass nouns, between proper nouns and common nouns, or between singulars and plurals. How Japanese 2- and 4-year-olds assign meaning to novel nouns associated with familiar and unfamiliar animals and inanimate objects was studied in the research reported here. When a novel label was given to an unfamiliar object, children assumed it to be a name for a basic-level object category whether the referent was an animal or an inanimate object. If the named object already had an established name, and if the object was an inanimate object, the children mapped the noun to a subordinate category. When the named object was an animal, however, they tended to interpret the label as a proper name. These results demonstrated that in the absence of useful information from syntax, 2-year-old Japanese children are able to fast map a noun to its meaning by elegantly coordinating word-learning biases and other available sources of information. 相似文献
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《西游记》中明确交代“金箍棒”是道家宝贝,与道教的重要人物大禹有密切关系。金箍棒原型是中国古代治水等水利工程使用的“定子”。大禹与“治水”密不可分,而“治水”极有可能是道家针刺疗法的起源。道家的针刺疗法和“铁棒磨成针”的修炼境界对金箍棒的千变万化肯定有着启发性的贡献。 相似文献
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实验室异丙醇-环己烷废液回收的研究 总被引：1，自引：0，他引：1
研究了大学物理化学实验中产生的异丙醇-环己烷废液的回收利用方法。先以水为萃取剂,对异丙醇-环己烷混合物进行萃取分离,得到粗环己烷和异丙醇水溶液,粗环己烷经精馏提纯,得到纯度为99.80%环己烷产品;异丙醇水溶液经恒沸精馏得纯度为99.55%异丙醇。 相似文献
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李宏图 《华东师范大学学报(哲学社会科学版)》2002,34(2):3-11
托克维尔出身于贵族家庭，但是他却理性地认为贵族制必然衰落，民主社会必然到来，民主是现代社会的重要特征。于是，托克维尔分析了贵族式自由的特征、价值、弊端以及民主的本质。他相信在一个民主的时代，自由不可能建立在贵族政治体制的基础之上；与此同时，他特别感兴趣的是如何避免民主专制主义，以及如何避免以民主的名义破坏自由。因此，托克维尔期望即将到来的社会不仅是一个民主的社会，而且是一个自由的社会；在这个社会中，民主和自由的结合会得以实现。 相似文献