全文获取类型
收费全文 | 133篇 |
免费 | 6篇 |
专业分类
化学 | 94篇 |
晶体学 | 1篇 |
力学 | 2篇 |
数学 | 7篇 |
物理学 | 35篇 |
出版年
2023年 | 2篇 |
2022年 | 6篇 |
2021年 | 1篇 |
2020年 | 2篇 |
2019年 | 2篇 |
2018年 | 2篇 |
2017年 | 2篇 |
2016年 | 3篇 |
2015年 | 5篇 |
2014年 | 13篇 |
2013年 | 6篇 |
2012年 | 14篇 |
2011年 | 14篇 |
2010年 | 6篇 |
2009年 | 3篇 |
2008年 | 8篇 |
2007年 | 13篇 |
2006年 | 6篇 |
2005年 | 14篇 |
2004年 | 2篇 |
2003年 | 4篇 |
2002年 | 5篇 |
2001年 | 1篇 |
2000年 | 1篇 |
1999年 | 1篇 |
1998年 | 1篇 |
1997年 | 2篇 |
排序方式: 共有139条查询结果,搜索用时 675 毫秒
71.
Molecular Diversity - Short synthetic peptide molecules which bind to a specific target protein with a high affinity to exert its function are known as peptide aptamers. The high specificity of... 相似文献
72.
K V S Shiv Chaitanya 《Pramana》2014,83(1):139-145
In this paper, it is shown that Stieltjes electrostatic model and quantum Hamilton Jacobi formalism are analogous to each other. This analogy allows the bound state problem to mimic as n unit moving imaginary charges \(i\hbar \) , which are placed in between the two fixed imaginary charges arising due to the classical turning points of the potential. The interaction potential between n unit moving imaginary charges \(i\hbar \) is given by the logarithm of the wave function. For an exactly solvable potential, this system attains stable equilibrium position at the zeros of the orthogonal polynomials depending upon the interval of the classical turning points. 相似文献
73.
Pundarikakshudu Kilambi Sharma Anilkumar S. Bhatt Chaitanya J. Kanaki Niranjan S. 《平面色谱法杂志一现代薄层色谱法》2014,27(5):362-366
JPC – Journal of Planar Chromatography – Modern TLC - The fruit of Piper longum Linn. (family: Piperaceae), known as pippali in India, is a reputed drug of Ayurveda (the Indian system... 相似文献
74.
Kumar Nagendra Chaitanya Vijay P.A. Ramakrishna 《Proceedings of the Combustion Institute》2019,37(3):3151-3158
The present study reports the development of a novel technique to quantify binder melt on the surface of the propellant. Non-aluminized AP-HTPB propellants of 86% particulate loading are used to illustrate the technique. Elemental maps of unburnt and extinguished propellant surface are obtained using EDS (Energy Dispersive Spectroscopy). Overlap between the elements is identified and the elemental maps are processed to calculate AP and binder area exposed in unburnt and extinguished samples. The AP area exposed is found to be around 72.3% and 63.3% for unburnt and extinguished samples, respectively, indicating a reduction in AP exposed area with extinguished samples. This has been attributed to the binder melt discussed in literature but never quantified. Simulations have been carried out to analyze and understand the effects of this binder melt. A random packing algorithm is used to simulate propellant packs. Also, a methodology to account for binder melt layer is introduced and is used to capture AP exposed areas. Effect of binder melt in propellants with different solid loading and varying particle size is discussed. It is shown that fine AP particles are more prone to being covered by binder melt than the coarse AP particles. A possible explanation to the behavior of plateau burning propellants observed in literature has been provided through this analysis. 相似文献
75.
Conventional explanations of proton NMR chemical shifts need fundamental revisions. Ab initio (IGLO) analyses reveal that the downfield delta (1)H of benzene is not due to deshielding ring current effects; the shielding is less than the pi contribution to vinyl delta (1)Hs. Enhanced deshielding sigma CC influences are responsible for the more downfield delta (1)Hs of the inner protons of naphthalene and anthracene. Double pi effects shield ethynyl Hs; there is no evidence for a special "ring current influence." 相似文献
76.
77.
Some fluoroaryl substituted 2-amino-3-cyanopyrroles 2 were synthesized from the reaction between (2-bromo-1-arylalkylidene)propanedinitriles 1 and fluoroaryl substituted aromatic amines under Gewald reaction condition, which on reaction with formamide and formic acid gave 4-aminopyrrolo[2,3-d]pyrimidines 3 and pyrrolo[2,3-d]-pyrimidin-4(3H)-ones 4 respectively. 4-Chloropyrrolo[2,3-d]pyrimidines 5 were prepared by chlorination of 4 with phosphorus oxychloride, which on hydrazinolysis provided 4-hydrazinopyrrolo[2–3-d]pyrirnidines 6 . 相似文献
78.
Chaitanya Vangala Sri Datta Madhavan Kutty V. K. Jawahar N. R. Kaushik C. P. 《Journal of Radioanalytical and Nuclear Chemistry》2022,331(6):2515-2522
Journal of Radioanalytical and Nuclear Chemistry - This paper describes the sorption of plutonium from aqueous medium containing oxalate ions using zero-valent iron nano particles as sorbent. The... 相似文献
79.
80.
Strino F Lii JH Koppisetty CA Nyholm PG Gabius HJ 《Journal of computer-aided molecular design》2010,24(12):1009-1021
The identification of glycan epitopes such as the histo-blood group ABH determinants as docking sites for bacterial/viral
infections and signals in growth regulation fuels the interest to develop non-hydrolysable mimetics for therapeutic applications.
Inevitably, the required substitution of the linkage oxygen atom will alter the derivative’s topology. Our study addresses
the question of the impact of substitution of oxygen by selenium. In order to characterize spatial parameters and flexibility
of selenoglycosides, we first performed ab initio calculations on model compounds to refine the MM4 force field. The following
application of the resulting MM4R version appears to reduce the difference to ab initio data when compared to using the MM4
estimator. Systematic conformational searches on the derivatives of histo-blood group ABH antigens revealed increased flexibility
with acquisition of additional low-energy conformer(s), akin to the behavior of S-glycosides. Docking analysis using the Glide
program for eight test cases indicated potential for bioactivity, giving further experimental investigation a clear direction
to testing Se-glycosides as lectin ligands. 相似文献