全文获取类型
收费全文 | 200篇 |
免费 | 3篇 |
国内免费 | 3篇 |
专业分类
化学 | 110篇 |
晶体学 | 3篇 |
力学 | 2篇 |
数学 | 56篇 |
物理学 | 35篇 |
出版年
2022年 | 12篇 |
2021年 | 8篇 |
2020年 | 2篇 |
2019年 | 8篇 |
2018年 | 12篇 |
2017年 | 2篇 |
2016年 | 7篇 |
2015年 | 3篇 |
2014年 | 7篇 |
2013年 | 14篇 |
2012年 | 13篇 |
2011年 | 13篇 |
2010年 | 7篇 |
2009年 | 17篇 |
2008年 | 11篇 |
2007年 | 3篇 |
2006年 | 9篇 |
2005年 | 10篇 |
2004年 | 9篇 |
2003年 | 5篇 |
2002年 | 2篇 |
2001年 | 6篇 |
2000年 | 1篇 |
1999年 | 4篇 |
1998年 | 1篇 |
1997年 | 1篇 |
1996年 | 2篇 |
1995年 | 2篇 |
1994年 | 1篇 |
1993年 | 2篇 |
1990年 | 2篇 |
1989年 | 2篇 |
1986年 | 1篇 |
1983年 | 2篇 |
1982年 | 3篇 |
1966年 | 1篇 |
1908年 | 1篇 |
排序方式: 共有206条查询结果,搜索用时 15 毫秒
61.
Petar Topalov 《Acta Appl Math》1999,59(3):271-298
We prove that the Riemannian metrics g and
(given in `general position") are geodesically equivalent if and only if some canonically given functions are pairwise commuting integrals of the geodesic flow of the metric g. This theorem is a multidimensional generalization of the well-known Dini theorem proved in the two-dimensional case. A hierarchy of completely integrable Riemannian metrics is assigned to any pair of geodesically equivalent Riemannian metrics. We show that the metrics of the standard ellipsoid and the Poisson sphere lie in such an hierarchy. 相似文献
62.
Marija Berendika Sandra Domjani Drozdek Dyana Odeh Nada Oroli Petar Dragi
evi Marijana Sokolovi Ivona Elez Garofuli Domagoj iki Irena Landeka Jur
evi 《Molecules (Basel, Switzerland)》2022,27(2)
Polyphenols of Laurel and Myrtle exhibit structural diversity, which affects bioavailability, metabolism, and bioactivity. The gut microbiota plays a key role in modulating the production, bioavailability and, thus the biological activities of phenolic metabolites, particularly after the intake of food containing high-molecular-weight polyphenols. The aim of this study was to investigate whether the polyphenolic components of Laurel and Myrtle aqueous extract have beneficial effects on rat health. The growth of lactic acid bacteria (LAB), β-glucuronidase, β-glucosidase, β-galactosidase activity, pH value, body weight change and food efficacy ratio after intragastric treatment of rats with Laurel and Myrtle extract at doses of 50 and 100 mg/kg for two weeks were investigated. The endogenous populations of colonic probiotic bacteria (Lactobacilli and Bifidobacteria) were counted on selective media. According to the obtained data, Laurel extract in the applied dose of 50 and 100 and Myrtle extract (100 mg/kg) positively affects the rats health by increasing the number of colonies of Lactobacilli and Bifidobacteria compared to the control group, causes changes in glycolytic enzymatic activity and minor change in antioxidative tissue activity. In addition, high doses of Laurel increase food efficiency ratio, while Myrtle has the same effect at a lower dose. 相似文献
63.
A possible approach for the treatment of meibomian gland disease (MGD) can be the supplementation of meibomian gland secretion (MGS) with nonpolar lipids (NPL) rich plant oils. Sesame oil (SO), approximately equal in monounsaturated fat (oleic acid, 40% of total) and polyunsaturated fat (linoleic acid, 42% of total), has shown multiple health benefits due to its anti-inflammatory and antioxidant effects. Thus, the interactions between SO and MGS in surface layers deserve further study. Therefore, pseudobinary films were formed with controlled MGS/SO molar ratios (0%, 10%, 30%, 50%, and 100% SO) at the air/water surface of the Langmuir trough over phosphate buffered saline (pH 7.4) subphase. Surface pressure (π)-area (A) isotherms and Brewster angle microscopy observations showed nonideal interactions where SO aggregates with MGS and complements the NPL stratum of the meibomian layers. The analysis of stress relaxation transients with Kohlrausch–Williams–Watts equation revealed that the supplementation of fixed amount of MGS with excess lipids via SO altered the dilatational elasticity of the films as reflected by the increase of the exponent β. Thus, SO with its unique combination of high oxidative stability and abundance of long polyunsaturated acyl chains might be a useful supplement to MGS layers. 相似文献
64.
The nanoscopic domain of structural complexity, which ranges from 1 to 100 run on a particle size scale includes a relatively unexplored area of science which resides between classical chemistry and molecular biology. This rapidly growing area of science is referred to as nanoscopic chemistry and architecture. Concepts evolving in this area lead to a rich variety of precise structures, architecture and properties. These concepts are based on dendritic macromolecules in general and on Starburst® dendrimers in particular. They envision dendrimers as fundamental building blocks which may be used to synthesize nanoscopic compounds, clusters, polymers, etc. Accordingly, dendrimers are regarded architecturally as functional analogues of atoms; therefore, their potential role in nanoscopic chemistry may be compared to that of the atoms in classical chemistry. 相似文献
65.
Nia Petrova Momchil Paunov Petar Petrov Violeta Velikova Vasilij Goltsev Sashka Krumova 《Molecules (Basel, Switzerland)》2021,26(19)
Single-walled carbon nanotubes (SWCNT) have recently been attracting the attention of plant biologists as a prospective tool for modulation of photosynthesis in higher plants. However, the exact mode of action of SWCNT on the photosynthetic electron transport chain remains unknown. In this work, we examined the effect of foliar application of polymer-grafted SWCNT on the donor side of photosystem II, the intersystem electron transfer chain and the acceptor side of photosystem I. Analysis of the induction curves of chlorophyll fluorescence via JIP test and construction of differential curves revealed that SWCNT concentrations up to 100 mg/L did not affect the photosynthetic electron transport chain. SWCNT concentration of 300 mg/L had no effect on the photosystem II donor side but provoked inactivation of photosystem II reaction centres and slowed down the reduction of the plastoquinone pool and the photosystem I end acceptors. Changes in the modulated reflection at 820 nm, too, indicated slower re-reduction of photosystem I reaction centres in SWCNT-treated leaves. We conclude that SWCNT are likely to be able to divert electrons from the photosynthetic electron transport chain at the level of photosystem I end acceptors and plastoquinone pool in vivo. Further research is needed to unequivocally prove if the observed effects are due to specific interaction between SWCNT and the photosynthetic apparatus. 相似文献
66.
Queueing Systems - Consider a sequence of stationary GI/D/Nqueues indexed by N↑∞, with servers' utilization $1 - \beta /\sqrt N ,\beta &;gt;0$ . For such queues we show that... 相似文献
67.
Some structural conclusions have been reached concerning vanadate glasses according to the influence of the Mn+-ions on the vibrations of the isolated V-O-bonds and the location of the bands in the IR-spectra. They may shift with the compositions or preserve their positions.Ions of predominant electrostatic interactions are distributed between the chains and the layers in the glass structure, they interact directly with the isolated V-O bonds. As a result of this the transition from VO5 into VO4 is achieved directly or through intermediate complexes.It is likely that ions which participate in covalent bonds fit into vanadate chains of the glass network in substitution positions. 相似文献
68.
Optimal strong Mal’cev conditions for congruence meet-semidistributivity in locally finite varieties
Jelena Jovanović Petar Marković Ralph McKenzie Matthew Moore 《Algebra Universalis》2016,76(3):305-325
Locally finite, congruence meet-semidistributive varieties have been characterized by numerous Mal’cev conditions and, recently, by two strong Mal’cev conditions. We provide three new strong Mal’cev characterizations and a new Mal’cev characterization each of which improves the known ones in some way. 相似文献
69.
Jack Liu Johann Chan Craig M. Bryant Petar A. Duspara Ernest E. Lee David Powell Hua Yang Ziping Liu Chris Walpole Edward Roberts Robert A. Batey 《Tetrahedron letters》2012,53(24):2971-2975
The fluorination of ketones, ketals, and enamides has been achieved using the electrophilic fluorinating reagent Selectfluor? (F-TEDA-BF4). For the reactions of ketones and ketals the use of sulfuric acid (0.1 equiv) as an additive was found to facilitate the reaction leading to more rapid product formation. This behavior is analogous to the known effects of acid catalysis on the bromination of ketones. The reactions were generally quite selective leading to the formation of monofluorinated products, and could be accomplished on reaction scales up to 85 mmol using N-protected piperidone based substrates. Reactions in the presence of MeOH led to the formation of the corresponding fluoroketones or fluoroketals depending upon the substrate. The formation of the fluoroketals in this manner, as well as the fluorination of cyclic enamides are examples of multi-component coupling reactions. 相似文献