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1.
《中国科学院院刊(英文版)》2004,(4)
A high-temperature & su-perconductor (HT-SC)magnetic levitation trainhas its merits shared by the conven-tional conductor type and the lower-temperature type of the maglevtrains but hasnt the latter twosdemerits. Its suspension height is50mm and its technical norms aboutthe smoothness on the roadbed andrail are much lower than those re-quired by the conventional conduc-tor maglev train. So, it is convenientto be introduced in a drive of large-scale popularization. Its suspensioncould be main… 相似文献
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《科学大众》2017,(Z1)
正China's 600 km/h maglev(magnetic levitation)train project,launched earlier this year,is in full swing.Jia Limin,head of China's high-speed rail innovation program,said a high-speed maglev test line with a length of no less than 5kilometers under the project is expected to be completed by 2021. 相似文献
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《中国科学院院刊(英文版)》2006,20(3):159-161
The first train from Beijing to Tibet set out on its maiden voyage along the world's highest railway on July 1, 2006. With most of the new 1,110-kilometer track from Golmud in Qinghai to Lhasa at altitudes above 4,000 meters, the train, which is known as the "sky train" by local people, crosses more than 550 kilometers of permafrost, posing a major challenge to the railway's design and construction. 相似文献
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FangXin 《中国科学院院刊(英文版)》2005,19(2):99-101
Since the latter half of 2004, China‘s top leaders have given higher priority to the issue of national capacity building for S&T innovation, Chinese President Hu Jintao reiterates that stress should be placed on the upgrading of innovation capacity when making overall plans for S&T development, and the task should remain the key link in promoting economic structural readjustment and raising national competitiveness. This strategic transition from imitation to innovation is also found in the National Long- & Medium-term Plan for S&T Development, which is being formulated under the leadership of Premier Wen Jiabao. The author explains the reason behind such a transition and the major administrative measures to be adopted for its implementation. 相似文献
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Cypripedium subtropicum S. C. Chen et K. Y. Lang is a phytogeography-
cally significant new species with its habit, inflorescence and column very similar to
those of Selenipedilum of tropical America. It is found in Mêdog of southeastern Xi-
zang, China. Its slender leafy stem bears at the summit a many-flowered raceme, am-
ounting to 1.5 m in height. Although its ovary is unilocular—this is the reason why
we place it in Cypripedium, the column characters resemble those of Selenipedilum. For
example, the staminode is rather small and its long stalk is very similar in texture and
color to the filament of the fertile stamens. Obviously, it is a primitive new species re-
lated to Selenipedilum based on the similarities mentioned above.
In the subfamily Cypripedioideae, as generally recognized, Selenipedilum is the
most primitive genus, from which or whose allies Cypripedium is derived. Of phyto-
geographical significance is the fact that Selenipedilum occurs in Central America and
northern South America, while a cypripedium akin to it is discontinuously distributed
in subtropical Asia. This suggests that Selenipedilum or Selenipedilum-like form be
once continually distributed in North America and eastern Asia when the climate there
was warmer, as it is in the subtropics today. The floristic relationship between Central
America and subtropical Asia appears to be closer than expected, as shown by the dis-
tribution patterns of Tropidia, Erythrodes, etc. Based on the occurrence of all six sec-
tions and particularly the most primitive form in eastern Asia, Cypripedium seems to
be of Asian, rather than Central American, origin. Selenipedilum possesses some very
primitive characters, such as trilocular ovary, vanilla-scented fruit, seed with sclerotic
testa, simple column and more or less suffrutescent habit. The latter is considered by
Dahlgren & Clifford (1982) to be one of ancestral characters of monocotyledons, which
is now very rare not only in Orchidaceae but also in all monocotyledons. It is indeed
necessary to make further investigations on Selenipedilum and also the new species pub-lished here, as well as a detailed comparison between them. 相似文献
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《中国科学院院刊(英文版)》2005,19(2):109-114
Editor‘s note: At the 04‘ National Conference for Science and Technology (5&T) Awards held on March 28, 2005 in Beijing, CA5 scientists were honored by 10 prizes of the National Natural Science Awards and 11 prizes of National Awards for 5&T Progress. BCAS is to present in installments a brief introduction to some of the winners. 相似文献
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ZHANG Min XIA Jun & HONG Cheng Huai River Water Resources Commission Ministry of Water Resources Bengbu Anhui China State 《中国科学院院刊(英文版)》2012,(1):40-47
This paper addresses the change of the river-lake relationship in the Huai River and its causes due to environmental change and human activities. A preliminary analysis is made from three aspects: (1) the natural geographical change particularly captured by the Yellow River, (2) water conservancy project construction, and (3) socioeconomic development in the Huai River Basin. Key problems of changes in this river-lake relationship and the Huai River flood control are tackled, involving flood control and disaster alleviation ability of the Basin, engineering and non-engineering measurements applied to flood control and disaster mitigation, and water governance for adaptive management. Research shows that the Huai River is a rather complex one due to its complex geography with a hybrid wet and dry climate zoon, and higher population density. With the alternation of the river-lake relationship and socioeconomic development in the region, new problems keep arising, imposing new requirements on its sustainable water management. Thus, understanding the Huai River is a long and gradually improving process. Its future planning should keep absorbing new achievements of science and technology development, employing new technologies and methods, and gradually deepening our understanding of its fundamental principles. Water governance and adaptive water management will be new challenges and opportunities for the Basin in its river system change and flood control. 相似文献
8.
《中国科学院院刊(英文版)》2016,(4)
正Human diseases may be caused by the malfunction of an intact protein.Hydrogen bond(h-bond)is one of the key interactions in maintaining the structure of a protein and facilitating its function.The presence and extent of h-bond cooperativity in proteins remains a fundamental question,and quantitative analysis 相似文献
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《中国科学院院刊(英文版)》2014,(1):52-54
<正>1.Possibility of the existence of extraterrestrial life Life is one of the most fascinating mysteries of nature.With the advances in space science and technology,life science has developed to the stage of exploring the possibility of existence of life outside the Earth system.In other words,by assessing the possibility of the existence of extraterrestrial life,its possible existence forms and regions can be determined roughly and the relevant theories and models can be also established.Combined with the development and application of the relevant detecting methods,it would be well-targeted to search for extraterrestrial life and various clues and evidences of its existence[1,2].The belief in the existence of extraterrestrial life has supported by a simple fact——the existence of 相似文献
10.
With Competitive Payload Design,HXMT Is “Important Extension of High Energy Astrophysics from Space”
《中国科学院院刊(英文版)》2016,(3)
正HXMT is a significant advance for high energy astrophysics in both China and the whole international community.Its sensitivity and broad energy band coverage with its 3 principal instruments(LE,ME,HE)are very competitive.The strength of the modulation technique is its simplicity:imaging can be achieved without the need for position-sensitive detectors(for the HE),which makes 相似文献
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本文结合我校物理系多年来在高职高专学生实践能力培养方面的探索,从教育目标定位、实训基地建设、实验课教学、实践教学师资队伍建设等几方面论述实践教学体系与学生能力培养的关系. 相似文献
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从"沙滩上的脸"到主体的"回归"——论福柯主体场域的变迁 总被引：1，自引：0，他引：1
吴贻玉 《科学技术与辩证法》2007,24(4):49-52
在现代性的推进中,主体性不断张扬,并导致了现代社会的困境。同许多思想大家一样,福柯把对主体性意识的思考作为探求解决现代文明危机的理论支点,从"沙滩上的脸"到伦理主体的构建,都充分说明了其在质疑和批判17至19世纪西方哲学奉主体为至尊的观点的同时,又在主体消亡的路途中寻找契机,去构建一个新的世界图景。 相似文献
15.
企业文化对企业成长的影响是全方位的.本文从战略决策文化、管理假设文化与伦理价值文化三个层面分析了不同企业文化对企业战略模式、管理模式及企业伦理环境的影响. 相似文献
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本文采用文献资料法、访谈法对影响青少年足球运动员意识水平发展的因素进行了分析,发现影响青少年足球运动员意识水平发展的因素主要分为客观因素和主观因素,其中客观因素包括：训练和比赛时周围的环境、教练员的训练水平和临场指挥、同队球员的配合、比赛时现场的气氛以及对手的情况等;主观因素包括：运动员的观察判断能力、技战术水平、智力水平、意志品质、性格特点等。并针对这些影响因素提出了改进措施,希望可以为我国青少年足球运动员足球意识水平的提高提供参考性的依据。 相似文献
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西藏将于2010年秋季开始实施新课程改革,新课改即将走进课堂,强烈影响着我们过去熟悉的教育环境,改变着过去的课程理念和教学方法。作为第一线的教师,我们究竟如何按照新课程标准更好地组织课堂、把握课堂、激活课堂?这是我们关心的问题,也是迫切需要解决的问题。本人对照高中数学数学新课程标准进行了教学反思,同时结合工作实践,对组织课堂、把握课堂、激活课堂的方法策略进行了初步的探索,以期达到抛砖引玉之良效。 相似文献
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"搭便车"与公司治理结构中利益相关者行为分析 总被引：2，自引：0，他引：2
随着经济全球化趋势的进一步加强，传统的公司结构所遵循“股东至上”的历史逻辑将面临公司的利益相差者共同治理结构的严峻挑战，公司利益相关者共同治理结构中难免出现“搭便车”现象，从而影响公司治理的效率。本文结合利益相关者理论对公司治理结构中利益相关者的部分“搭便车”行为进行分析，提出了一些防止“搭便车”行为的有效方法。 相似文献