浅析李烈钧"御外患、修内政"的救亡主张

“九．一八”事变以后,李烈钧积极投射于抗日救亡活动,学主界对此 鲜有研究,本文的初浅考察表明,“九．一八”事变后李烈均所提“御外患、修内政”的主张,虽然带有其阶段的局限性,但总体上在于对抗日与民主的追求,因而符合中华民族抗日救亡的根本利益。     

西门子PLC强制及保持功能应用

本针对西门子S7—200系列PLC实际应用中出现的问题进行研究，提出一些在使用强制及保持功能时应注意的问题以及由此引发的在程序编制上的一些改革。     

建筑节能与外墙外保温

我国建筑节能的核心就是对建筑物围护结构和采暖系统进行革新,其中墙体保温施工技术在建筑节能中发挥着越来越重要的作用。目前,我国外墙保温技术发展很快,是节能工作的重点。本文分析了建筑的高能耗与建设节约型社会的矛盾,阐述了外墙外保温系统的优点,并介绍了主要的外保温系统。     

大学生职业锚的测量及其在职业生涯规划中的运用

通过对陕西省6所高校的450名大学生的职业锚问卷调查,测量了当前大学生职业锚的类型.分析不同性别、不同专业和不同年级的大学生职业锚特点.提出了运用职业锚类型和特点进行大学生职业生涯规划的思考和建议.     

煤炭企业节约用电的意义及措施

阐述了煤矿企业节约用电的现实意义，提出了节电的有效措施，包括加强煤矿节电工作的技术管理、提高设备工作效率、减少输电线路的能量损耗、提高系统的功率因数、推广使用节能产品和节能技术等。     

Innovations for a changing and challenging world

We live in a rapidly changing world. Firstly, emerging and developing countries＇ research and innovation capabilities are increasing rapidly. China is the most impressive example, having dramatically increased its expenditure on research and development （R＆D） and its human resources for science and technology. As a result, China＇ s share of global knowledge resources has grown dramatically in the past 30 years. Secondly, the nature of innovation is changing. Innovation used to be very much defined and dominated by large companies in Europe, North America and Japan, characterized by a strongly science driven and linear process in which knowledge was generated in academia and then commercialized by industry.     

Mutation and sex in a competitive world

How do deleterious mutations interact to affect fitness? The answer to this question has substantial implications for a variety of important problems in population biology, including the evolution of sex, the rate of adaptation and the conservation of small populations. Here we analyse a mathematical model of competition for food in which deleterious mutations affect competitive ability. We show that, if individuals usually compete in small groups, then competition can easily lead to a type of genetic interaction known as synergistic epistasis. This means that a deleterious mutation is most damaging in a genome that already has many other deleterious mutations. We also show that competition in small groups can produce a large advantage for sexual populations, both in mean fitness and in ability to resist invasion by asexual lineages. One implication of our findings is that experimental efforts to demonstrate synergistic epistasis may not succeed unless the experiments are redesigned to make them much more naturalistic.     

图书馆节约读者时间的途径探讨

探讨了如何使图书馆的开馆时间与读者的闲暇时间相吻合的问题,分析了延长开馆时间的重要性,提出了节约读者时间的具体措施。     

实验课中培养学生节约观念和环保意识

实验教师在实验课中,不但要培养学生理论联系实际、技术操作的能力,同时还要培养学生勤俭节约环境保护意识的好习惯,提高学生利用所学的化学知识解决实验中遇到的实际问题的能力。