全文获取类型
收费全文 | 92篇 |
免费 | 0篇 |
国内免费 | 2篇 |
专业分类
系统科学 | 1篇 |
现状及发展 | 40篇 |
研究方法 | 9篇 |
综合类 | 44篇 |
出版年
2022年 | 1篇 |
2018年 | 1篇 |
2016年 | 1篇 |
2015年 | 1篇 |
2013年 | 2篇 |
2012年 | 2篇 |
2011年 | 4篇 |
2009年 | 1篇 |
2008年 | 1篇 |
2007年 | 4篇 |
2006年 | 2篇 |
2005年 | 3篇 |
2004年 | 7篇 |
2003年 | 5篇 |
2002年 | 7篇 |
2001年 | 2篇 |
1999年 | 3篇 |
1998年 | 1篇 |
1997年 | 1篇 |
1995年 | 1篇 |
1994年 | 1篇 |
1992年 | 2篇 |
1990年 | 4篇 |
1988年 | 2篇 |
1987年 | 4篇 |
1986年 | 4篇 |
1985年 | 6篇 |
1984年 | 1篇 |
1983年 | 2篇 |
1982年 | 1篇 |
1981年 | 2篇 |
1979年 | 2篇 |
1978年 | 1篇 |
1975年 | 1篇 |
1974年 | 1篇 |
1971年 | 2篇 |
1970年 | 4篇 |
1969年 | 1篇 |
1966年 | 1篇 |
1965年 | 1篇 |
1959年 | 1篇 |
排序方式: 共有94条查询结果,搜索用时 343 毫秒
61.
Springel V White SD Jenkins A Frenk CS Yoshida N Gao L Navarro J Thacker R Croton D Helly J Peacock JA Cole S Thomas P Couchman H Evrard A Colberg J Pearce F 《Nature》2005,435(7042):629-636
The cold dark matter model has become the leading theoretical picture for the formation of structure in the Universe. This model, together with the theory of cosmic inflation, makes a clear prediction for the initial conditions for structure formation and predicts that structures grow hierarchically through gravitational instability. Testing this model requires that the precise measurements delivered by galaxy surveys can be compared to robust and equally precise theoretical calculations. Here we present a simulation of the growth of dark matter structure using 2,160(3) particles, following them from redshift z = 127 to the present in a cube-shaped region 2.230 billion lightyears on a side. In postprocessing, we also follow the formation and evolution of the galaxies and quasars. We show that baryon-induced features in the initial conditions of the Universe are reflected in distorted form in the low-redshift galaxy distribution, an effect that can be used to constrain the nature of dark energy with future generations of observational surveys of galaxies. 相似文献
62.
K. M. Fukasawa K. Fukasawa M. Harada 《Cellular and molecular life sciences : CMLS》1979,35(9):1142-1143
Summary The enzymes which were extracted by autodigestion from the microsomal fractions of the pig kidney, liver and submaxillary gland and from the serum showed an immunochemical identity by a double immunodiffusion test. But the kidney enzyme had a different pI-value from the pI-values of the enzymes of other organs.This investigation was supported by a grant from the Ministry of Education, Japan to K. M. F. We would like to thank Dr Toshiharu Nagatsu (Department of Life Chemistry, Graduate School at Nagatsuta, Tokyo Institute of Technology, Yokohama, Japan) for helpful suggestions, Mr Moritoshi Sato (Matsumoto Meat Inspection Station, Matsumoto, Japan) for their generous supply of pig organs and Ajinomoto Co. Inc., Tokyo, Japan, for the gift of Gly-Pro-p-nitroanilide tosylate. Technical assistance of Miss K. Yanagisawa is gratefully acknowledged. 相似文献
63.
H. Oya I. Nagatsu M. Harada T. Nagatsu 《Cellular and molecular life sciences : CMLS》1970,26(3):252-253
Zusammenfassung Die Aktivität der Aminopeptidasen in Ohrspeicheldrüsen wurde gemessen. Glycyl-Prolin-naphthylamid, Alanin-naphthylamid, Leucin-naphthylamid, Methionin-naphthylamid, und Arginin-naphthylamid wurden von der Mikrosomenfraktion und der löslichen Fraktion schnell gespalten. Das Glycyl-Prolin-naphthylamid spaltende Enzym war in Ohrspeicheldrüsen in relativ grösserer Menge vorhanden. Die Aufspaltung von Glycyl-Prolin-naphthylamid in Glycyl-Prolin und-Naphthylamin wurde papierchromatographisch nachgewiesen. 相似文献
64.
65.
Ayano Chiba Haruko Watanabe-Takano Takahiro Miyazaki Naoki Mochizuki 《Cellular and molecular life sciences : CMLS》2018,75(8):1349-1362
The heart is regarded as an endocrine organ as well as a pump for circulation, since atrial natriuretic peptide (ANP) and brain natriuretic peptide (BNP) were discovered in cardiomyocytes to be secreted as hormones. Both ANP and BNP bind to their receptors expressed on remote organs, such as kidneys and blood vessels; therefore, the heart controls the circulation by pumping blood and by secreting endocrine peptides. Cardiomyocytes secrete other peptides besides natriuretic peptides. Although most of such cardiomyocyte-derived peptides act on the heart in autocrine/paracrine fashions, several peptides target remote organs. In this review, to overview current knowledge of endocrine properties of the heart, we focus on cardiomyocyte-derived peptides (cardiomyokines) that act on the remote organs as well as the heart. Cardiomyokines act on remote organs to regulate cardiovascular homeostasis, systemic metabolism, and inflammation. Therefore, through its endocrine function, the heart can maintain physiological conditions and prevent organ damage under pathological conditions. 相似文献
66.
67.
1 IntroductionWiththe high-speed development of Chinese economy,allkinds of industrial wastewaters containing the bio-degradedlydifficult organic pollutants , NH3-N compounds andsuspended substances in high concentrations are increasingquickly. All circles of Chinese society and all levels ofgovernmental environmental protection departments are payingmore and more comprehensive attention to the series ofproblems caused by the high concentrated industrialwastewaters, such as water body pollut… 相似文献
68.
Naoki Konno Kyoichi Kijima 《系统科学与信息学报》2006,4(1):183-192
This paper aims to propose ERT (Expected Reaching Time), a new risk adverse evaluation criterion of finite multiplication processes, and to examine its properties in relation to the dominance criterion. The ERT means the expected time that takes for an objective valiable to reach a target value. To deal with the environmental risk involved in the process, the expectation maximizing strategy may be the most well known. However, for many cases the dominance strategy rather than the expectation maximizing strategy is adopted and works very well. In this paper we first prove rigorously that minimization of the ERT is equivalent to the dominance criterion in the infinite period. Then we demonstrate by simulation that the ERT gives almost equal evaluation as the dominance criterion even for the finite multiplications, after showing that it is approximately proportional to the logarithm of the target value. 相似文献
69.
70.
Thermomechanical fatigue behavior of a nickel base single crystal superalloy TMS-82 has been investigated.It was found that the micropores in the alloy tend to initiate large amounts of deformation twins and the crack causes many twins to occur during its propagation.It is postulated that these twins around the micropores or the crack are induced by the stress eld of the micropores or the crack tip,respectively.A thermodynamic model is adopted linking the twin formation energy with the stress eld around the crack tip,which explains the observed results with good consistency.The in uencing factors for a crack to stimulate twins around it are shown by the model,which might provide possible ways to enhance the alloy’s thermomechanical fatigue performance. 相似文献