全文获取类型
收费全文 | 449篇 |
免费 | 7篇 |
国内免费 | 2篇 |
专业分类
化学 | 264篇 |
晶体学 | 38篇 |
力学 | 22篇 |
数学 | 34篇 |
物理学 | 100篇 |
出版年
2022年 | 3篇 |
2021年 | 10篇 |
2020年 | 6篇 |
2019年 | 14篇 |
2018年 | 7篇 |
2017年 | 8篇 |
2016年 | 16篇 |
2015年 | 8篇 |
2014年 | 18篇 |
2013年 | 35篇 |
2012年 | 23篇 |
2011年 | 36篇 |
2010年 | 23篇 |
2009年 | 19篇 |
2008年 | 19篇 |
2007年 | 23篇 |
2006年 | 18篇 |
2005年 | 15篇 |
2004年 | 6篇 |
2003年 | 8篇 |
2002年 | 7篇 |
2001年 | 5篇 |
2000年 | 3篇 |
1997年 | 5篇 |
1996年 | 8篇 |
1995年 | 4篇 |
1994年 | 3篇 |
1993年 | 3篇 |
1992年 | 5篇 |
1991年 | 4篇 |
1990年 | 3篇 |
1989年 | 5篇 |
1988年 | 9篇 |
1987年 | 3篇 |
1985年 | 3篇 |
1984年 | 4篇 |
1983年 | 4篇 |
1979年 | 8篇 |
1978年 | 5篇 |
1977年 | 8篇 |
1975年 | 3篇 |
1967年 | 2篇 |
1959年 | 3篇 |
1957年 | 2篇 |
1956年 | 2篇 |
1955年 | 2篇 |
1948年 | 2篇 |
1942年 | 2篇 |
1940年 | 2篇 |
1937年 | 2篇 |
排序方式: 共有458条查询结果,搜索用时 423 毫秒
121.
Alan G. Ryder John De Vincentis Boyan Li Paul W. Ryan Narayana M. S. Sirimuthu Kirk J. Leister 《Journal of Raman spectroscopy : JRS》2010,41(10):1266-1275
The use of Raman spectroscopy for the qualitative and quantitative analysis of dilute aqueous solutions is of interest to the biopharmaceutical manufacturing sector. However, the inherent weakness of the Raman effect, coupled with spectral variability due to spurious signals from sample holders, can produce significant problems for chemometric‐based high‐throughput assays. Therefore, there is a need for a multi‐well sample holder that ensures robust and repeatable measurements, in particular from dilute aqueous solutions such as cell culture media. Here we demonstrate the efficacy of a novel, electropolished, stainless steel multi‐well plate (SS‐MWP) sample holder with 96 wells for dilute aqueous solution analysis. A comprehensive study of the spectroscopic behaviour was carried out and comparisons made with multi‐well plates fabricated from polystyrene, polypropylene, and aluminium. A key factor in the validation studies is the use of intrinsically weak Raman scattering systems, e.g. water and dilute glucose solutions. The data collected show that the SS‐MWPs are much superior in terms of robustness, resistance to chemical attack, and measurement reproducibility and as such are the ideal sample holders for Raman analysis of dilute solutions. Copyright © 2010 John Wiley & Sons, Ltd. 相似文献
122.
We present a formulation of deformed oscillator algebra which leads to intermediate statistics as a continuous interpolation between Bose-Einstein and Fermi-Dirac statistics. It is deduced that a generalized permutation or exchange symmetry leads to the introduction of the basic number and it is then established that this in turn leads to the deformed algebra of oscillators. We obtain the mean occupation number describing the particles obeying intermediate statistics which thus establishes the interpolating statistics and describe boson-like and fermion-like particles obeying intermediate statistics. We also obtain an expression for the mean occupation number in terms of an infinite continued fraction, thus clarifying successive approximations. 相似文献
123.
Flavones chemically are anthoxanthins, occur either in the free state or as glycosides associated with tannins (flavanoids). Flavanoids (derivatives of flavone) possess various pharmacological activities and due to its xanthine-oxidase enzyme inhibitory effect it also has superoxide-scavenging activities. A series of 2-phenyl-2,3-dihydrochromon-4-one derivatives (flavanone derivatives) were synthesized from chalcones by cyclization method and their activities were evaluated against some gram positive and gram-negative bacteria. IR, NMR and CHN analysis confirmed the structure of the synthesized compounds. The results of the antibacterial studies shows that compounds 2b, 2e, 2f and 2h possess activity against many bacterial strains. Among that the compound (2h) has remarkable activity against all strains viz. 25 microg/ml inhibitory concentration against S. aureus, S. sonnei, E. coli, S. typhimurium and V. cholerae. Compound 2f possess minimum inhibitory concentration of 200 microg/ml against E. coli and S. typhimurium and 25 microg/ml against S. sonnei, S. dysenteriae and V. cholerae. In silico metabolic and toxicity study of the synthesized compounds were performed and the predicted result showed that the compound having hydroxyl functional group undergo sulfate and O-glucuronide conjugation reaction and methoxy derivatives undergo demethylation reaction. The biologically active compounds are free of toxicity in oncogene, teratogen, sensitivity and immunotoxicity. 相似文献
124.
J.S. Yadav B.V. Subba Reddy A.V. Ganesh G.G.K.S. Narayana Kumar 《Tetrahedron letters》2010,51(22):2963-159
(R)-Citronellal undergoes initial ene reaction followed by Prins cyclization with aldehydes in the presence of 5 mol % of scandium triflate at ambient temperature to furnish octahydro-2H-chromen-4-ols in good yields and with high cis-selectivity. The use of scandium triflate makes this procedure simple, more convenient, and practical. 相似文献
125.
High-pressure Raman scattering studies at ambient temperature are performed on n-heptane. We observe a liquid-solid transition around 1.5 GPa from the changes in the Raman spectra. This has been reported in earlier works. With increasing pressure, we observe large changes in the Raman modes and the spectra show a distinct change around 7.5 GPa. This marks the solid-solid transition at 7.5 GPa observed in n-heptane for the first time. As predicted in theoretical work, we observe dampening of methyl rotation in n-heptane below 7.5 GPa. With increase in pressure above 7.5 GPa we observe a definitive conversion of gauche to trans conformation in the solid phase. Upon release of pressure we do not observe any hysteresis, which suggests that the solid-solid transition takes place with no volume change or is a second-order transition. In this paper we propose this transition to be an orientational order-disorder transition driven by the dampening of the rotation of the methyl group. 相似文献
126.
127.
128.
129.
M. V. R. Prasad D. S. Surya Narayana R. K. Jeevanram 《Journal of Radioanalytical and Nuclear Chemistry》1995,197(2):281-293
A sequential method has been developed for the estimation of106Ru,137Cs, and90Sr in urine using beta counting. After completely destroying the organic matter in urine,106Ru is oxidized to volatile ruthenium tetroxide and allowed to reactin-situ with polyethylene powder;137Cs is concentrated on ammonium phosphomolybdate and estimated as tetraphenylborate;90Sr is coprecipitated as strontium sulphate and converted to carbonate. The recoveries have been found to be better than 83% for all of the radionuclides. The minimum detection limits are 0.16, 0.85, and 0.14 Bq/dm3 for106Ru,137Cs, and90Sr, respectively. Yttrium-90 fraction of90Sr is also estimated using sodium nitroprusside as reagent, after allowing it to grow for 14 days.This work forms part of the doctoral work of SRIM.V.R. PRASAD to be submitted to the University of Madras, under the supervision of DR. O.M. SREEDHARAN. 相似文献
130.
1. Cacotheline has previously been employed as a colorimetric reagent for the detection of Sn+2 and V+3 ions. The present investigation covers its use as a reagent for the detection of Fe+2 and Fe+3 ions. 2. Fe+2 ions give a pink colour with a solution of cacotheline at a pH lying between 1.48 and 4.58 in the presence of a sufficient concentration of sodium oxalate, which serves to bind the Fe+3 ions by complex formation. At a pH below 1.24, only a very light pink colour is produced and this develops slowly. When the pH of the solution is about 5.2, a blue colour is obtained. The limit of identification is 1.5 γ and the concentration limit is 1 : 40,000 of Fe+2. While testing for Fe+2 at very low concentration, it is necessary to employ a very dilute solution of cacotheline (0.025%), while for solutions of higher concentrations saturated cacotheline solution (about 0.25%) is recommended. A detailed investigation has been made concerning the conditions determining the stability of the pink colour. 3. It has also been observed that sodium malonate, sodium citrate, sodium malate, sodium tartrate and sodium lactate are effective as complexing agents for binding Fe+3 ions. 4. Orthophosphate has not been found effective as a complexing agent under the conditions adopted, while pyrophosphate and metaphosphate have been found effective. 5. Fe+3 ions are reduced to Fe+2 by exposure to sunlight or the light from a Philip's Repro lamp in the presence of the appropriate buffer solution and sodium oxalate. 相似文献