全文获取类型
收费全文 | 195篇 |
免费 | 9篇 |
出版年
2016年 | 3篇 |
2015年 | 2篇 |
2014年 | 3篇 |
2013年 | 6篇 |
2012年 | 4篇 |
2011年 | 6篇 |
2010年 | 2篇 |
2009年 | 2篇 |
2007年 | 6篇 |
2006年 | 2篇 |
2005年 | 6篇 |
2004年 | 3篇 |
2003年 | 3篇 |
2002年 | 2篇 |
1996年 | 2篇 |
1992年 | 2篇 |
1974年 | 2篇 |
1973年 | 3篇 |
1970年 | 2篇 |
1969年 | 3篇 |
1967年 | 2篇 |
1966年 | 2篇 |
1965年 | 2篇 |
1964年 | 2篇 |
1963年 | 4篇 |
1962年 | 3篇 |
1961年 | 8篇 |
1960年 | 5篇 |
1959年 | 9篇 |
1958年 | 5篇 |
1956年 | 5篇 |
1955年 | 5篇 |
1953年 | 5篇 |
1951年 | 3篇 |
1950年 | 2篇 |
1949年 | 4篇 |
1948年 | 4篇 |
1947年 | 2篇 |
1946年 | 4篇 |
1944年 | 4篇 |
1942年 | 4篇 |
1939年 | 6篇 |
1938年 | 3篇 |
1937年 | 3篇 |
1936年 | 4篇 |
1935年 | 4篇 |
1931年 | 3篇 |
1930年 | 2篇 |
1901年 | 1篇 |
1899年 | 1篇 |
排序方式: 共有204条查询结果,搜索用时 187 毫秒
61.
Book reviewed in this article:
AFRICA: Le Antiche Rovine e Miniere della Rhodesia . L idio C ipriani .
AFRICA: Osservazioni sui Pigmei centro Africani . L idio C ipriani . 相似文献
AFRICA: Le Antiche Rovine e Miniere della Rhodesia . L idio C ipriani .
AFRICA: Osservazioni sui Pigmei centro Africani . L idio C ipriani . 相似文献
62.
63.
Kovats RS Edwards SJ Charron D Cowden J D'Souza RM Ebi KL Gauci C Gerner-Smidt P Hajat S Hales S Hernández Pezzi G Kriz B Kutsar K McKeown P Mellou K Menne B O'Brien S van Pelt W Schmid H 《International journal of biometeorology》2005,49(4):207-214
Campylobacter is among the most important agents of enteritis in developed countries. We have described the potential environmental determinants of the seasonal pattern of infection with campylobacter in Europe, Canada, Australia and New Zealand. Specifically, we investigated the role of climate variability on laboratory-confirmed cases of campylobacter infection from 15 populations. Regression analysis was used to quantify the associations between timing of seasonal peaks in infection in space and time. The short-term association between weekly weather and cases was also investigated using Poisson regression adapted for time series data. All countries in our study showed a distinct seasonality in campylobacter transmission, with many, but not all, populations showing a peak in spring. Countries with milder winters have peaks of infection earlier in the year. The timing of the peak of infection is weakly associated with high temperatures 3 months previously. Weekly variation in campylobacter infection in one region of the UK appeared to be little affected by short-term changes in weather patterns. The geographical variation in the timing of the seasonal peak suggests that climate may be a contributing factor to campylobacter transmission. The main driver of seasonality of campylobacter remains elusive and underscores the need to identify the major serotypes and routes of transmission for this disease. 相似文献
64.
Distributions of Potential in Cylindrical Coordinates and Time Constants for a Membrane Cylinder 总被引:3,自引:1,他引:2 下载免费PDF全文
Wilfrid Rall 《Biophysical journal》1969,9(12):1509-1541
A mathematical problem relating to membrane cylinders is stated and solved; its implications are illustrated and discussed. The problem concerns the volume distribution, in cylindrical coordinates, of the electric potential inside and outside a membrane cylinder of finite length (with sealed ends), during passive decay of an initially nonuniform membrane potential. The time constants for equalization with respect to the angle, theta, are shown to be typically about ten thousand times smaller than the time constant, tau(m) = R(m)C(m), for uniform passive membrane potential decay. The time constants for equalization with respect to length are shown to agree with those from one-dimensional cable theory; typically, they are smaller than tau(m) by a factor between 2 and 10. The relation of the membrane current density, I(m)(theta, x, t), to the values (at the outer membrane surface) of the extracellular potential phi(e)(r, theta, x, t) and of partial differential(2)phi(e)/ partial differentialx(2), is examined and it is shown that these quantities are not proportional to each other, in general; however, under certain specified conditions, all three of these quantities are proportional with each other and with phi(i)(r, theta, x, t) and partial differential(2)phi(i)/ partial differentialx(2) (at the inner membrane surface). The relation of these results to those of one-dimensional cable theory is discussed. 相似文献
65.
66.
67.
68.
69.
Harold W. Barber Mary Liston C. H. Browning C. H. Mills J. C. Buckley A. Louise McIlroy E. T. Burke W. Wyndham Powell A. Cambell Henry Semon E. R. T. Clarkson Alexr. Malcolm Simpson Wilfrid Fox Kenneth Walker A. Mearns Fraser David Watson L. W. Harrison Alexander Wilson Matthew Hay Frederick P. Wilson Francis S. Kidd Robert Forgan David Lees 《BMJ (Clinical research ed.)》1922,1(3204):859-860
70.