全文获取类型
收费全文 | 53篇 |
免费 | 2篇 |
国内免费 | 1篇 |
专业分类
化学 | 25篇 |
力学 | 3篇 |
数学 | 13篇 |
物理学 | 15篇 |
出版年
2013年 | 2篇 |
2012年 | 1篇 |
2011年 | 1篇 |
2010年 | 1篇 |
2009年 | 1篇 |
2008年 | 2篇 |
2006年 | 3篇 |
2005年 | 1篇 |
2004年 | 2篇 |
2002年 | 1篇 |
2001年 | 1篇 |
2000年 | 1篇 |
1999年 | 4篇 |
1997年 | 3篇 |
1996年 | 1篇 |
1993年 | 1篇 |
1991年 | 2篇 |
1989年 | 1篇 |
1988年 | 3篇 |
1987年 | 2篇 |
1985年 | 2篇 |
1984年 | 2篇 |
1982年 | 1篇 |
1980年 | 1篇 |
1978年 | 1篇 |
1976年 | 2篇 |
1973年 | 2篇 |
1972年 | 2篇 |
1970年 | 1篇 |
1969年 | 1篇 |
1966年 | 1篇 |
1965年 | 1篇 |
1944年 | 2篇 |
1917年 | 2篇 |
1901年 | 1篇 |
排序方式: 共有56条查询结果,搜索用时 15 毫秒
31.
为改善壳聚糖对细胞的特异性吸附,采用水溶性碳二亚胺将生物活性短肽精氨酸-甘氨酸-天冬氨酸-丝氨酸(RGDS)固定到壳聚糖膜的表面,采用X射线光电子能谱检测固定多肽前后的壳聚糖膜表面,发现反应后壳聚糖膜表面氮元素含量增大,Nls和Cls曲线拟合谱中酰胺键增多,表明RGDS短肽已固定到壳聚糖膜的表面;人角膜缘上皮细胞体外培养实验表明,固定RGDS后壳聚糖膜的细胞黏附率有了明显提高,固定RGDS后的壳聚糖膜在角膜组织工程支架等方面有更好的应用潜力。 相似文献
32.
The excitation and emission spectra of octahedrally coordinated europium ion (Eu2+) ions in Cs2M2+P2O7 (M2+=Ca, Sr) are reported and discussed. The remarkable features of the Eu2+ luminescence in these phosphate materials include (a) very large Stokes shift of emission (∼1 eV), (b) high luminescence quenching temperature, and (c) unusually low energy of the emitted photons for Eu2+ luminescence in phosphate-based materials. The broad emission bands of Eu2+ in Cs2CaP2O7 and Cs2SrP2O7 peak at 607 and 563 nm, respectively. The Stokes shift, crystal field splitting, centroid shift and the red shift of the Eu2+ 4f65d1 electronic configuration have been estimated from the relevant optical data. The radiative lifetime of the Eu2+ emission in Cs2M2+P2O7 is ∼1.2 μs. The nature of the Eu2+ emission in Cs2M2+P2O7 is discussed and arguments are presented to associate the luminescence with an extreme case of normal 4f65d1→4f7[8S7/2] emission. 相似文献
33.
34.
35.
R. W. Chaney 《Journal of Optimization Theory and Applications》1989,61(2):179-202
Several types of finite-dimensional nonlinear programming models are considered in this article. Second-order optimality conditions are derived for these models, under the assumption that the functions involved are piecewiseC
2. In rough terms, a real-valued function defined on an open subsetW orR
n
is said to be piecewiseC
k
onW if it is continuous onW and if it can be constructed by piecing together onW a finite number of functions of classC
k
. 相似文献
36.
37.
RE Tribble A Azhari HL Clark CA Gagliardi Y-W Lui AM Mukhamedzhanov A Sattaroy X Tang L Trache V Burjan J Cejpek V Kroha S Piskor J Vincour F Carstoiu 《Pramana》1999,53(3):585-594
S-factors for direct capture reactions can be found at astrophysical energies from asymptotic normalization coefficients which
provide the normalization of the tail of the overlap function. For example the overlap for 8B → 7Be+p defines the S-factor for 7Be (p, γ)8B. Peripheral transfer reactions offer a technique to determine these asymptotic normalization coefficients. As a test of
the technique, the 16O(3He, d)17F reaction has been used to determine asymptotic normalization coefficients for transitions to the ground and first excited
states of 17F. The S-factors for 16O(p, γ)17F calculated from these 17F → 16O+p asymptotic normalization coefficients are found to be in very good agreement with recent measurements. Following the same
technique, the 10B(7Be, 8B)9Be and 14N(7Be, 8B)13C reactions have been used to measure the asymptotic normalization coefficient for 7Be(p, γ)8B. This result provides an indirect determination of S
17(0). 相似文献
38.
White WL Wagner CD Hall JT Chaney EE George B Hofmann K Miller LA Williams JD 《Rapid communications in mass spectrometry : RCM》2005,19(2):241-249
Each year increasing numbers of proteins are submitted for routine characterization by liquid chromatography/mass spectrometry (LC/MS). This paper reports a solution that transforms routine LC/MS analysis of proteins into a fully automated process that significantly reduces analyst intervention. The solution developed, protein open-access (OA) LC/MS, consists of web-enabled sample submission and registration, automated data processing, data interpretation, and report generation. Sample submissions and results are recorded in a LIMS that utilizes an Oracle database. The protein sequence is captured during the sample submission process, stored in the database, and utilized to determine the theoretical protein molecular weight. This calculated mass is used to set the parameters for transformation of the mass-to-charge spectra to the mass domain and evaluate the presence or absence of the desired protein. Three protein OA-LC/MS instruments have been deployed in our facility to support protein characterization, purification, and modification efforts. 相似文献
39.
40.
Newcomb K. Chaney L. Compagno W. Judson Marsh J. G. Fairchild L. Bertiaux G. W. Morden B. P. Richardson A. K. Balls C. C. McDonell W. H. Ross W. S. Hendrikson Le Roy W. McCay L. M. Dennis B. J. Lemon P. A. von der Meulen Easton O. L. Shinn und Ch. A. Peters 《Fresenius' Journal of Analytical Chemistry》1917,56(6-7):317-318
Ohne Zusammenfassung 相似文献