全文获取类型
收费全文 | 99篇 |
免费 | 0篇 |
专业分类
化学 | 47篇 |
数学 | 17篇 |
物理学 | 35篇 |
出版年
2022年 | 2篇 |
2021年 | 2篇 |
2019年 | 1篇 |
2018年 | 2篇 |
2017年 | 1篇 |
2016年 | 2篇 |
2015年 | 6篇 |
2014年 | 2篇 |
2013年 | 4篇 |
2012年 | 5篇 |
2011年 | 9篇 |
2010年 | 5篇 |
2009年 | 2篇 |
2008年 | 6篇 |
2007年 | 3篇 |
2006年 | 6篇 |
2005年 | 4篇 |
2004年 | 2篇 |
2003年 | 2篇 |
2000年 | 4篇 |
1999年 | 1篇 |
1990年 | 1篇 |
1989年 | 1篇 |
1988年 | 3篇 |
1987年 | 5篇 |
1986年 | 2篇 |
1985年 | 3篇 |
1984年 | 4篇 |
1982年 | 1篇 |
1981年 | 2篇 |
1979年 | 1篇 |
1977年 | 1篇 |
1976年 | 2篇 |
1900年 | 1篇 |
1899年 | 1篇 |
排序方式: 共有99条查询结果,搜索用时 31 毫秒
91.
M. Barth A. E. De Wolf D. P. Johnson P. Theocharopoulos H. Drevermann Y. Goldschmidt-Clermont J. P. Porte R. T. Ross S. Squarcia C. Caso R. Contri F. Fontanelli R. Monge U. Trevisan J. F. Baland J. Beaufays J. Hanton F. Grard P. A. van der Poel L. Gatignon D. J. Schotanus A. Stergiou R. T. Van de Walle V. V. Brizgalov P. V. Chliapnikov A. B. Fenyuk I. A. Gritsaenko O. V. Kasian V. M. Kubic S. B. Lugovsky V. I. Nikolaenko Y. L. Petrovykh V. M. Ronjin V. A. Yarba 《Zeitschrift fur Physik C Particles and Fields》1982,16(2):111-117
Results are presented onK + p elastic scattering and on the reactionK + p→K + pπ+π? at 70 GeV/c. For the elastic channel, we measured the total ((2.29±0.04)mb) and differentialdσ/dt cross sections. The reactionK + p→K + pπ+π? has a total cross section of (470±23) μb and is shown to be dominated by diffractive dissociation processes. The contributions of the quasi-two-body channels $$K^ + p \to K*^0 (890)\Delta ^{ + + } (1,236)$$ and $$K^ + p \to K*^0 (1,430)\Delta ^{ + + } (1,236)$$ and of the Double-Pomeron Exchange (DPE) processes are estimated. 相似文献
92.
J. L. Bailly A. Batunin B. Buschbeck C. Caso Y. Chiba H. Dibon F. J. Diez-Hedo T. Emura B. Epp A. Ferrando F. Fontanelli T. Gemesy P. Girtler I. V. Gorelov A. Gurtu R. Hamatsu Ph. Herquet T. Hirose J. Hrubec Y. Iga E. Kistenev T. Kobayashi J. M. Kohli S. Krasznovszky P. K. Malhotra J. C. Marin M. Markytan I. S. Mittra L. Mohtanet G. Neuhofer G. Pinter P. Porth T. Rodrigo J. B. Singh S. Squarcia K. Sudhakar L. A. Tikhonova U. Trevisan T. Tsurugai V. Yarba G. Zholobov EHS-RCBC Collaboration 《Zeitschrift fur Physik C Particles and Fields》1986,31(3):367-373
93.
94.
95.
In this work we explore the constraints that the structure
of the neural motor program imposes to the possible songs learned by oscine
birds. We carry out this program by translating anatomical information on
the structure of these nuclei into a computational model. We investigate
with analytical and numeral tools this model, and use its solutions to
generate synthetic songs. This allows us to perform specific predictions on
the simultaneous measurement of acoustic features and the physiological
variables during the song. 相似文献
96.
Cheung KT Trevisan J Kelly JG Ashton KM Stringfellow HF Taylor SE Singh MN Martin-Hirsch PL Martin FL 《The Analyst》2011,136(10):2047-2055
Endometriosis is the growth of endometrial tissue outside of the uterine cavity. Its aetiology remains obscure, and it is difficult to diagnose ranging from asymptomatic to debilitating disease. Mid-infrared (IR) spectroscopy has become recognised as a potential clinical diagnostic tool. Biomolecules absorb mid-IR (4000 cm(-1) to 400 cm(-1)) and from this, a biochemical-cell fingerprint in the form of an absorbance spectrum can be derived. We set out to determine if IR spectroscopy could be used to identify underlying biochemical differences between endometrial tissues growing outside of the uterus (ectopic) from endometrial tissue of the uterus (eutopic). For comparative purposes, endometrial tissues from endometriosis-free women were also obtained (benign eutopic). Attenuated total reflection Fourier-transform IR (ATR-FTIR) spectroscopy or transmission FTIR microspectroscopy was employed for spectral acquisition. Principal component analysis (PCA)-linear discriminant analysis (LDA) was used for chemometric analysis. A clear segregation was exhibited between the three categories independent of inter-individual confounding differences. Importantly, there was a marked difference between eutopic endometrial tissue from patients with or without endometriosis. This indicates that IR spectroscopy coupled with multivariate analysis (e.g., PCA-LDA) may provide a non-invasive diagnostic tool for endometriosis. By analysing the underlying biochemistry of these endometrial tissues, this approach may facilitate a better understanding of this pathology. 相似文献
97.
The perturbed Laplacian matrix of a graph G is defined as DL = D?A, where D is any diagonal matrix and A is a weighted adjacency matrix of G. We develop a Fiedler-like theory for this matrix, leading to results that are of the same type as those obtained with the algebraic connectivity of a graph. We show a monotonicity theorem for the harmonic eigenfunction corresponding to the second smallest eigenvalue of the perturbed Laplacian matrix over the points of articulation of a graph. Furthermore, we use the notion of Perron component for the perturbed Laplacian matrix of a graph and show how its second smallest eigenvalue can be characterized using this definition. 相似文献
98.
We prove an extension of the Ocone–Karatzas integral representation, valid for all BV functions on the classical Wiener space. We also establish an elementary chain rule formula and combine the two results to compute explicit integral representations for some classes of BV composite random variables. 相似文献
99.
Trevisan A Piovesan S Leonardi A Bertocco M Nicolosi P Pelizzo MG Angelini A 《Photochemistry and photobiology》2006,82(4):1077-1079
UV radiation is known to cause acute and chronic eye and skin damage. The present case report describes a 90 min accidental exposure to UV-C radiation of 26 medical school students. Germicidal lamps were lit due to a malfunctioning of the timer system. Several hours after irradiation exposure, all subjects reported the onset of ocular symptoms, subsequently diagnosed as photokeratitis, and skin damage to the face, scalp and neck. While the ocular symptoms lasted 2-4 days, the sunburn-like condition produced significant erythema followed by deep skin exfoliation. The irradiation was calculated to be approximately 700 mJ cm(-2) absorbed energy, whereas the actual radiation emitted by the lamps was 0.14 mW cm(-2) (the radiometric measurements confirmed these calculi, because the effective irradiance measured from the height of the autopsy table to about 1 m under the UV-C lamp varied from 0.05 to 0.25 mW cm(-2)) but, more likely, the effective irradiance, according to skin phototype and symptoms, was between 50 and 100 mJ cm(-2). The ocular and skin effects produced by such a high irradiation (largely higher than that accepted by the American Conference of Governmental Industrial Hygienists [ACGIH] threshold limit values [TLVs]) appeared reversible in a relatively short time. 相似文献