全文获取类型
收费全文 | 610篇 |
免费 | 11篇 |
专业分类
化学 | 322篇 |
晶体学 | 2篇 |
力学 | 25篇 |
数学 | 18篇 |
物理学 | 254篇 |
出版年
2021年 | 6篇 |
2019年 | 6篇 |
2016年 | 9篇 |
2014年 | 5篇 |
2013年 | 26篇 |
2012年 | 10篇 |
2011年 | 20篇 |
2010年 | 8篇 |
2009年 | 12篇 |
2008年 | 18篇 |
2007年 | 18篇 |
2006年 | 13篇 |
2005年 | 21篇 |
2004年 | 20篇 |
2003年 | 11篇 |
2002年 | 14篇 |
2001年 | 18篇 |
2000年 | 14篇 |
1999年 | 14篇 |
1998年 | 14篇 |
1997年 | 9篇 |
1996年 | 9篇 |
1995年 | 7篇 |
1994年 | 13篇 |
1993年 | 10篇 |
1992年 | 15篇 |
1991年 | 10篇 |
1990年 | 18篇 |
1989年 | 7篇 |
1988年 | 9篇 |
1987年 | 7篇 |
1986年 | 7篇 |
1985年 | 7篇 |
1984年 | 8篇 |
1983年 | 9篇 |
1982年 | 6篇 |
1981年 | 12篇 |
1980年 | 14篇 |
1979年 | 13篇 |
1978年 | 18篇 |
1977年 | 9篇 |
1976年 | 8篇 |
1975年 | 12篇 |
1974年 | 8篇 |
1973年 | 18篇 |
1972年 | 8篇 |
1971年 | 7篇 |
1970年 | 8篇 |
1967年 | 5篇 |
1933年 | 7篇 |
排序方式: 共有621条查询结果,搜索用时 15 毫秒
61.
Are active elements necessary in the basilar membrane impedance? 总被引:1,自引:0,他引:1
62.
What type of force does the cochlear amplifier produce? 总被引:1,自引:0,他引:1
P J Kolston E de Boer M A Viergever G F Smoorenburg 《The Journal of the Acoustical Society of America》1990,88(4):1794-1801
Recent experimental measurements suggest that the mechanical displacement of the basilar membrane (BM) near threshold in a viable mammalian cochlea is greater than 10(-8) cm, for a stimulus sound-pressure level at the eardrum of 20 microPa. The associated response peak is very sensitive to the physiological condition of the cochlea. In the formulation of all recent cochlear models, it has been explicitly assumed that this peak is produced by the cochlear amplifier injecting a large amount of energy into the cochlea, thereby altering the real component of the BM impedance. In this paper, a new cochlear model is described which produces a realistic response by assuming that the cochlear amplifier force acts at a phase such that the main effect is to reduce the imaginary component of the BM impedance. In this new model, the magnitude of the cochlear amplifier force required to produce a realistic response is much smaller than in the previous models. It is suggested that future experimental investigations should attempt to determine both the magnitude and the phase of the forces associated with the cochlear amplifier. 相似文献
63.
Recently, a state-dependent change of measure for simulating overflows in the two-node tandem queue was proposed by Dupuis
et al. (Ann. Appl. Probab. 17(4):1306–1346, 2007), together with a proof of its asymptotic optimality. In the present paper, we present an alternative, shorter and simpler
proof. As a side result, we obtain interpretations for several of the quantities involved in the change of measure in terms
of likelihood ratios.
Part of this research has been funded by the Dutch BSIK/BRICKS project; part of this research was done while the first author
was visiting INRIA/IRISA, Rennes, France. 相似文献
64.
M. Anselmino H. Avakian D. Boer F. Bradamante M. Burkardt J. P. Chen E. Cisbani M. Contalbrigo D. Crabb D. Dutta L. Gamberg H. Gao D. Hasch J. Huang M. Huang Z. Kang C. Keppel G. Laskaris Z. -T. Liang M. X. Liu N. Makins R. D. Mckeown A. Metz Z. -E. Meziani B. Musch J. -C. Peng A. Prokudin X. Qian Y. Qiang J. W. Qiu P. Rossi P. Schweitzer J. Soffer V. Sulkosky Y. Wang B. Xiao Q. Ye Q. -J. Ye F. Yuan X. Zhan Y. Zhang W. Zheng J. Zhou 《The European Physical Journal A - Hadrons and Nuclei》2011,47(3):1-21
65.
66.
67.
Prokofiev A. A. Moskalenko A. S. Yassievich I. N. de Boer W. D. A. M. Timmerman D. Zhang H. Buma W. J. Gregorkiewicz T. 《JETP Letters》2010,90(12):758-762
JETP Letters - The effect of quantum confinement on the direct bandgap of spherical Si nanocrystals has been modelled theoretically. We conclude that the energy of the direct bandgap at the... 相似文献
68.
69.
70.
D. K. G. de Boer A. J. G. Leenaers W. W. van den Hoogenhof 《Applied Physics A: Materials Science & Processing》1994,58(3):169-172
Specular reflectivity, diffuse scattering at glancing incidence and angle-dependent total-reflection X-ray fluorescence are complementary techniques for the investigation of layered materials. The principles of these glancing-incidence X-ray methods are briefly discussed. Examples show the strength of the combination of these techniques. 相似文献