全文获取类型
收费全文 | 2538篇 |
免费 | 76篇 |
国内免费 | 13篇 |
出版年
2013年 | 54篇 |
2012年 | 61篇 |
2011年 | 51篇 |
2010年 | 67篇 |
2009年 | 111篇 |
2008年 | 83篇 |
2007年 | 62篇 |
2006年 | 58篇 |
2005年 | 56篇 |
2004年 | 52篇 |
2003年 | 25篇 |
2002年 | 16篇 |
2001年 | 15篇 |
2000年 | 16篇 |
1999年 | 28篇 |
1998年 | 39篇 |
1997年 | 41篇 |
1996年 | 38篇 |
1995年 | 28篇 |
1994年 | 26篇 |
1993年 | 18篇 |
1992年 | 34篇 |
1990年 | 24篇 |
1989年 | 22篇 |
1988年 | 19篇 |
1987年 | 21篇 |
1986年 | 19篇 |
1985年 | 19篇 |
1984年 | 14篇 |
1983年 | 18篇 |
1982年 | 14篇 |
1981年 | 22篇 |
1980年 | 14篇 |
1979年 | 20篇 |
1978年 | 15篇 |
1977年 | 15篇 |
1972年 | 14篇 |
1971年 | 17篇 |
1959年 | 51篇 |
1958年 | 123篇 |
1957年 | 138篇 |
1956年 | 141篇 |
1955年 | 162篇 |
1954年 | 155篇 |
1953年 | 124篇 |
1952年 | 108篇 |
1951年 | 99篇 |
1950年 | 60篇 |
1949年 | 16篇 |
1948年 | 24篇 |
排序方式: 共有2627条查询结果,搜索用时 687 毫秒
171.
PHILIP S WANG MATTHIAS ANGERMEYER GUILHERME BORGES RONNY BRUFFAERTS WAI TAT CHIU GIOVANNI DE GIROLAMO JOHN FAYYAD OYE GUREJE JOSEP MARIA HARO YUEQIN HUANG RONALD C KESSLER VIVIANE KOVESS DAPHNA LEVINSON YOSHIBUMI NAKANE MARK A OAKLEY BROWN JOHAN H ORMEL JOSé POSADA-VILLA SERGIO AGUILAR-GAXIOLA JORDI ALONSO SING LEE STEVEN HEERINGA BETH-ELLEN PENNELL SOMNATH CHATTERJI T. BEDIRHAN üSTüN 《World psychiatry》2007,6(3):177-185
Data are presented on patterns of failure and delay in making initial treatment
contact after first onset of a mental disorder in 15 countries in the World
Health Organization (WHO)''s World Mental Health (WMH) Surveys. Representative
face-to-face household surveys were conducted among 76,012 respondents aged
18 and older in Belgium, Colombia, France, Germany, Israel, Italy, Japan,
Lebanon, Mexico, the Netherlands, New Zealand, Nigeria, People''s Republic
of China (Beijing and Shanghai), Spain, and the United States. The WHO Composite
International Diagnostic Interview (CIDI) was used to assess lifetime DSM-IV
anxiety, mood, and substance use disorders. Ages of onset for individual disorders
and ages of first treatment contact for each disorder were used to calculate
the extent of failure and delay in initial help seeking. The proportion of
lifetime cases making treatment contact in the year of disorder onset ranged
from 0.8 to 36.4% for anxiety disorders, from 6.0 to 52.1% for mood disorders,
and from 0.9 to 18.6% for substance use disorders. By 50 years, the proportion
of lifetime cases making treatment contact ranged from 15.2 to 95.0% for anxiety
disorders, from 7.9 to 98.6% for mood disorders, and from 19.8 to 86.1% for
substance use disorders. Median delays among cases eventually making contact
ranged from 3.0 to 30.0 years for anxiety disorders, from 1.0 to 14.0 years
for mood disorders, and from 6.0 to 18.0 years for substance use disorders.
Failure and delays in treatment seeking were generally greater in developing
countries, older cohorts, men, and cases with earlier ages of onset. These
results show that failure and delays in initial help seeking are pervasive
problems worldwide. Interventions to ensure prompt initial treatment contacts
are needed to reduce the global burdens and hazards of untreated mental disorders. 相似文献
172.
New records of marine Tardigrada in the Mediterranean Sea 总被引:1,自引:0,他引:1
SANTIAGO VILLORA-MORENO SUSANNA DE ZIO GRIMALDI 《Zoological Journal of the Linnean Society》1996,116(1-2):149-166
Meiofauna from Chafarinas archipelago (western Mediterranean, N. Africa) were studied, and marine Tardigrada were identified to species level. A total of 15 species, belonging to families Stygarctidae, Halechiniscidac (Subfamilies Halechiniscinae, Florarctinae, Styraconyxinae and Tanarctinae), Batillipedidae, and Echiniscoididae, were found for the first time from the Alboran Sea and southwestern Mediterranean area. Four species and one subspecies are new records for the Mediterranean Sea: I'ioractus acer, F. asper, P. stellatus, Actinarctus doryphorus and Echiniscoides sigismundi hispaniensis. The male of Floractus stellatus , previously unknown to science, is described. Many species have been recorded for the first time in different sedimentary environments, such as midlittoral pools, very shallow gravels, pools in a mixed rocky environment or between Posidonia oceanica meadows, 'Amphioxus' gravels, and coastal detritic. 相似文献
173.
174.
175.
WILLEM G. VAN HERK ROBERT S. VERNON CHANTELLE HARDING BERNARD D. ROITBERG GERHARD GRIES 《Physiological Entomology》2010,35(1):19-28
The effects of carbon dioxide and the induction of morbidity on aversion learning in larvae of the Pacific Coast wireworm Limonius canus LeConte (Coleoptera: Elateridae) are discussed. Wireworms preconditioned by exposing them one or four times to odour of Tefluthrin 20SC and Dividend XLRTA [Syngenta Crop Protection (Canada), Inc., Canada] during the induction of temporary morbidity subsequently contact tefluthrin‐treated wheat seeds in soil bioassays for as long as naïve (i.e. not preconditioned) larvae but are repelled four to five‐fold more frequently by Dividend‐treated seeds in soil bioassays than naïve wireworms, suggesting that wireworms are capable of associating a novel odour (i.e. Dividend) with morbidity but require a minimum of 10–15 min subsequent contact time with treated seeds before being repelled. Wireworms preconditioned by exposure to peppermint odour during the induction of morbidity are not subsequently repelled by peppermint odour in soil bioassays, suggesting that wireworms are either not capable of aversion learning or that the presence of a CO2 source and/or a suitable host plant may override a negative cue (i.e. peppermint odour). In studies conducted in the absence of soil, a host plant and CO2 production, wireworms are repelled slightly by droplets of 1.0% but not 0.1% peppermint oil. Previous exposure to peppermint odour or contact with peppermint oil‐treated filter paper during one induction of morbidity does not increase the repellency of wireworms to 1.0% peppermint oil significantly. Repellency to 1.0% peppermint oil is almost eliminated when morbidity is induced five times in the absence of peppermint odour but is restored when peppermint odour is present during preconditioning. These findings suggest that wireworm sensitivity to repellent compounds decreases when repeatedly made moribund, although the results are not sufficient to conclude that wireworms are capable of associative learning. 相似文献
176.
177.
178.
179.
180.
DUJARRIC DE LA RIVIERE R 《Biologie médicale》1954,43(3):233-250