全文获取类型
收费全文 | 149篇 |
免费 | 7篇 |
专业分类
化学 | 95篇 |
晶体学 | 2篇 |
力学 | 6篇 |
数学 | 25篇 |
物理学 | 28篇 |
出版年
2021年 | 5篇 |
2020年 | 4篇 |
2019年 | 6篇 |
2018年 | 4篇 |
2017年 | 2篇 |
2016年 | 4篇 |
2015年 | 2篇 |
2014年 | 4篇 |
2013年 | 13篇 |
2012年 | 10篇 |
2011年 | 22篇 |
2010年 | 6篇 |
2009年 | 3篇 |
2008年 | 5篇 |
2007年 | 10篇 |
2006年 | 3篇 |
2005年 | 6篇 |
2004年 | 2篇 |
2003年 | 4篇 |
2002年 | 5篇 |
2001年 | 2篇 |
2000年 | 3篇 |
1999年 | 4篇 |
1998年 | 1篇 |
1997年 | 2篇 |
1996年 | 2篇 |
1993年 | 1篇 |
1992年 | 3篇 |
1991年 | 5篇 |
1990年 | 1篇 |
1989年 | 6篇 |
1988年 | 1篇 |
1987年 | 2篇 |
1986年 | 1篇 |
1975年 | 1篇 |
1974年 | 1篇 |
排序方式: 共有156条查询结果,搜索用时 312 毫秒
61.
Díaz E Barrios H del Río Portilla F Guzmán A Aguilera JL Becerril R Jankowski CK Reynolds WF 《Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy》2000,56(11):2191-2201
The reaction of substituted diarylidene acetones with hydroxylamine hydrochloride affords isomeric N-hydroxy diaryl piperidinone oximes as main products. The structures as well as conformational equilibria of these products were established by 1H and 13C NMR spectroscopy and further studied by variable temperature NMR. It was found that the cis/trans ratio of 2,6-substituted piperidine derivatives depended on the position of the substituent on the aromatic ring. 相似文献
62.
Fabio J. Mazzotti Lizandra Barrios Ranjini Raghunandan John P. Maier 《Molecular physics》2013,111(2):335-344
Theoretical quantitative considerations as well as experimental data are presented based on absorption population depletion coupled with cavity ringdown spectroscopy. The absorbing number densities inside the cavity are determined by numerical integration of the coupled rate equations. The number of photons involved in absorption, cavity losses due to mirror reflectivity and stimulated emission are taken into account. The principle is to monitor a first transition by cavity ringdown spectroscopy while a second transition, with a state in common, is resonantly excited by the decaying radiation of different frequency also trapped inside the optical cavity. A numerical example is given for atomic lines of neon and the measurements carried out in a supersonic slit-jet expansion discharge demonstrate the feasibility of the technique. The technique is also proven to work with two resonant transitions of C2. Translational velocity of the jet modifying the rate equations is included in the model. 相似文献
63.
D. Barrios Rolanía A. Branquinho 《Journal of Difference Equations and Applications》2013,19(2):197-213
Given a solution of a high order Toda lattice we construct a one parameter family of new solutions. In our method, we use a set of Bäcklund transformations such that each new generalized Toda solution is related to a generalized Volterra solution. 相似文献
64.
Lizandra Maria Zimmermann-Dimer 《Tetrahedron》2009,65(21):4239-641
Three merocyanine dyes (two pyridiniophenolates and Brooker's merocyanine) were dissolved in trichloromethane in their protonated form, and their potential as anionic chromogenic chemosensors was explored by adding various anions. The experimental data collected were treated considering a model based on the proton transfer from the protonated dye to the anion. One of the dyes was used in the development of an anionic colorimetric assay based on a trichloromethane-water biphasic system, which was able to selectively detect cyanide among other anionic species. 相似文献
65.
66.
67.
Díaz E Barrios H Corona D Guzmán A Díaz R Fuentes A 《Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy》2002,58(10):2079-2087
The ene-ene [2 + 2] cycloaddition of 2-benzyl-5-benzylidenecyclopentanone proceeds smoothly and spontaneously in benzene-d6 or deuteriochloroform solution to give two different diphenyl dispiro [4.1.4.1] dodecan-4,11-diones. Detailed 1H and 13C 2DNMR spectroscopy (COSY, HMQC, HMBC) were performed in order to prove the existence in solution of two cyclobutane derivatives, one a previously described photodimer obtained by the UV irradiation of crystals of 2-benzyl-5-benzylidenecyclopentanone. 相似文献
68.
Mohanad Darawsheh Dr. Leoni A. Barrios Dr. Olivier Roubeau Dr. Simon J. Teat Dr. Guillem Aromí 《Chemistry (Weinheim an der Bergstrasse, Germany)》2016,22(25):8635-8645
A new bis(pyrazolylpyridine) ligand (H2L) has been prepared to form functional [Fe2(H2L)3]4+ metallohelicates. Changes to the synthesis yield six derivatives, X@[Fe2(H2L)3]X(PF6)2?xCH3OH ( 1 , x=5.7 and X=Cl; 2 , x=4 and X=Br), X@[Fe2(H2L)3]X(PF6)2?yCH3OH?H2O ( 1 a , y=3 and X=Cl; 2 a , y=1 and X=Br) and X@[Fe2(H2L)3](I3)2?3 Et2O ( 1 b , X=Cl; 2 b , X=Br). Their structure and functional properties are described in detail by single‐crystal X‐ray diffraction experiments at several temperatures. Helicates 1 a and 2 a are obtained from 1 and 2 , respectively, by a single‐crystal‐to‐single‐crystal mechanism. The three possible magnetic states, [LS–LS], [LS–HS], and [HS–HS] can be accessed over large temperature ranges as a result of the structural nonequivalence of the FeII centers. The nature of the guest (Cl? vs. Br?) shifts the spin crossover (SCO) temperature by roughly 40 K. Also, metastable [LS–HS] or [HS–HS] states are generated through irradiation. All helicates (X@[Fe2(H2L)3])3+ persist in solution. 相似文献
69.
Giancarlo Richard Salazar-Banda Géssica de Oliveira Santiago Santos Isabelle Maria Duarte Gonzaga Aline Resende Dória Katlin Ivon Barrios Eguiluz 《Current Opinion in Electrochemistry》2021
This review provides a current opinion about the most recent advances in the development of novel materials (i.e., anodes and cathodes), as well as new synthesis methodologies, which have been used in water and wastewater treatment by electrochemically driven oxidation technologies. The first section focuses on the advances to produce novel anodic materials comprising the active anodes — which play a key role in direct and indirect oxidation and the nonactive materials — which attract attention due to their high capacity to generate hydroxyl radicals. The second section describes recent progress on the novel emerging cathodic materials that are directly related to in situ electrogeneration of oxidants and are commonly applied in the electro-Fenton technology. Finally, the perspectives and prospects of these novel electrode materials for environmental applications are given. 相似文献
70.
Vanderléia Gava Marini Lizandra Maria Zimmermann Vanderlei Gageiro Machado 《Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy》2010,75(2):799-806
Solutions of 2,4-dinitrodiphenylamine (1) in dimethylsulfoxide (DMSO) are colorless but upon deprotonation they become red. Addition of various anionic species (HSO4?, H2PO4?, NO3?, CN?, CH3COO?, F?, Cl?, Br?, and I?) to solutions of 1 revealed that only CN?, F?, CH3COO?, and H2PO4? led to the appearance of the red color in solution. The presence of increasing amounts of water in solutions containing 1 made it progressively selective toward CN? and the system with the addition of 4.3% (v/v) of water was highly selective for CN? among all anions studied. The experimental data collected indicated that proton transfer from 1 to the anion occurs, and a model was used to explain the experimental results, which considers two 1:anion stoichiometries, 1:1 and 1:2. For the latter, the data suggest that the anion forms firstly a hydrogen-bonded complex with a second anion equivalent necessary for the abstraction of the proton, with the formation of a [HA2]? complex. The study performed here demonstrates the important role of the environment of the anion and 1 for the efficiency of the chromogenic chemosensor. Besides the different affinities of each anion for water, the solvation of both the anion and 1 is responsible for reducing the interaction between these species. In small amounts, water or hydrogen-bonded DMSO–water complexes are able to stabilize the conjugated base of 1 through hydrogen bonding, making 1 more acidic, which explains the change from 1:1 and 1:2 toward 1:1 1:anion stoichiometry upon addition of water. In addition, water is able to solvate the anion and also 1, which hinders the formation of 1:1 hydrogen-bonded 1:anion complexes prior to the abstraction of the proton. 相似文献