全文获取类型
收费全文 | 748篇 |
免费 | 23篇 |
国内免费 | 5篇 |
专业分类
安全科学 | 27篇 |
废物处理 | 39篇 |
环保管理 | 132篇 |
综合类 | 86篇 |
基础理论 | 228篇 |
污染及防治 | 185篇 |
评价与监测 | 50篇 |
社会与环境 | 23篇 |
灾害及防治 | 6篇 |
出版年
2023年 | 6篇 |
2022年 | 8篇 |
2021年 | 10篇 |
2020年 | 8篇 |
2019年 | 13篇 |
2018年 | 21篇 |
2017年 | 31篇 |
2016年 | 30篇 |
2015年 | 19篇 |
2014年 | 17篇 |
2013年 | 78篇 |
2012年 | 22篇 |
2011年 | 27篇 |
2010年 | 26篇 |
2009年 | 33篇 |
2008年 | 39篇 |
2007年 | 42篇 |
2006年 | 28篇 |
2005年 | 27篇 |
2004年 | 30篇 |
2003年 | 25篇 |
2002年 | 22篇 |
2001年 | 20篇 |
2000年 | 11篇 |
1999年 | 8篇 |
1998年 | 8篇 |
1997年 | 11篇 |
1996年 | 14篇 |
1995年 | 11篇 |
1994年 | 12篇 |
1993年 | 10篇 |
1992年 | 5篇 |
1991年 | 3篇 |
1990年 | 8篇 |
1989年 | 6篇 |
1988年 | 11篇 |
1987年 | 7篇 |
1986年 | 6篇 |
1985年 | 5篇 |
1984年 | 8篇 |
1983年 | 4篇 |
1982年 | 4篇 |
1980年 | 5篇 |
1979年 | 5篇 |
1978年 | 4篇 |
1977年 | 3篇 |
1976年 | 4篇 |
1973年 | 3篇 |
1972年 | 5篇 |
1969年 | 4篇 |
排序方式: 共有776条查询结果,搜索用时 15 毫秒
161.
R. Wilson G. Peters J. Regel D. Grémillet K. Pütz M. Kierspel H. Weimerskirch J. Cooper 《Marine Biology》1998,130(4):559-566
Stomach temperature loggers have proved useful for the study of feeding activity in free-living seabirds, but their usage
has been restricted because they are frequently dislodged and lost during the seabirds' regular regurgitation of indigestible
prey remains. In the present study we examine the incidence of spontaneous regurgitation (pellet production) in free-living
seabirds, consider the effect this has on the likely retrieval of stomach temperature loggers and present a structural modification
of the logger housings which leads to a much lower incidence of regurgitation. Systems were tested on albatrosses, cormorants,
gannets and penguins.
Received: 15 July 1997 / Accepted: 31 October 1997 相似文献
162.
The pattern of settlement over time of three broadcast spawning coral species (Cyphastrea serailia, Acanthastrea lordhowensis, and Goniastrea australensis) from the Solitary Islands (30°00′S; 153°20′E) was studied in 1995 and 1996 in order to determine the maximum length of time
these larvae could remain in the water column and still retain the ability to settle and metamorphose. Larvae were maintained
in aquaria and the number which had settled on biologically-conditioned tile pairs was monitored every 5 to 10 d. While the
majority of larvae settled quickly after becoming competent, some larvae survived and settled for extended periods after spawning.
Competency periods ranged from 26 d for C. serailia to 56 d for G. australensis and 78 d for A. lordhowensis. These data greatly extend the known competency periods for larvae of broadcast-spawning corals and indicate the potential
for transport of broadcast-spawned coral larvae over large distances. Medium to long-distance larval dispersal of the species
studied provides a mechanism for their widespread distribution in subtropical regions, on reefs which are often widely spaced
and relatively isolated.
Received: 27 May 1997 / Accepted: 27 November 1997 相似文献
163.
Pinniped Penises in Trade: A Molecular-Genetic Investigation 总被引:1,自引:0,他引:1
S. Malik P. J. Wilson R. J. Smith D. M. Lavigne & B. N. White 《Conservation biology》1997,11(6):1365-1374
164.
165.
OEIS complex (exstrophy of the cloaca) is an association of fetal malformations that includes omphalocele, exstrophy of the bladder, imperforate anus, and spinal defects. Most cases should be prenatally detectable by maternal serum alpha-fetoprotein screening, but an accurate diagnosis is essential for appropriate counselling of the family. 相似文献
166.
An apparently normal female infant was born after the prenatal diagnosis of fragile Xq27×28 present in about 4 per cent of amniocytes. The mildly retarded mother had been found in early pregnancy to be heterozygous for fragile X. The child, now 9 months old. showed about the same level of fragile X expression as her mother. Variations in the proportion of cells with fragile X appeared to be related to cell type and laboratory techniques. The infant's growth and development have been normal. Different techniques to induce or increase the expression of fragile X are discussed. 相似文献
167.
Qin Shao Machelle D. Wilson Christopher S. Romanek Keith A. Hobson 《Environmental and Ecological Statistics》2004,11(3):323-337
A temporal record of environmental conditions is often contained within accretionary biological tissue. These records can provide knowledge of the environmental conditions that existed at the time the tissue was formed. In this study, we look at trace element concentrations and isotopic ratios of carbon and nitrogen as contained in baleen from bowhead whales in the eastern and western Arctic Ocean. Time series techniques, including maximum likelihood method and likelihood ratio tests, are applied to analysis of data and inference about their mean structures. 相似文献
168.
Twins concordant for elevated alpha-fetoprotein (AFP) and acetylcholinesterase (AChE) and discordant for neural tube defect (NTD) and sex are reported. A literature review reveals instances of termination of twin pregnancies with one normal and one abnormal fetus, partly based on concordant high AFP and positive AChE (although discordant on ultrasound examination). The levels of AFP and AChE in twin pregnancies are probably a function of the number of layers of fetal membranes separating twin sacs: dichorionic, diamniotic membranes allow transfer of AFP; monochorionic, diamniotic membranes allow transfer of both AFP and AChE. Cautious interpretation of biochemical findings and reliance on high resolution ultrasonography are suggested. 相似文献
169.
Lance A. Waller Brett J. Goodwin Mark L. Wilson Richard S. Ostfeld Stacie L. Marshall Edward B. Hayes 《Environmental and Ecological Statistics》2007,14(1):83-100
We present an exploratory analysis of reported county-specific incidence of Lyme disease in the northeastern United States
for the years 1990–2000. We briefly review the disease ecology of Lyme disease and the use of risk maps to describe local
incidence as estimates of local risk of disease. We place the relevant elements of local environmental and ecological variables,
local disease incidence, and (importantly) local disease reporting in a conceptual context to frame our analysis. We then
apply hierarchical linear models of increasing complexity to summarize observed patterns in reported incidence, borrowing
information across counties to improve local precision. We find areas of increasing incidence in the central northeastern
Atlantic coast counties, increasing incidence branching to the north and west, and an area of fairly stable and slightly decreasing
reported incidence in western New York. 相似文献
170.
Anne Wilson Goldizen 《Behavioral ecology and sociobiology》1987,20(2):99-109
Summary Wild saddle-back tamarins (Saguinus fuscicollis) in southeastern Peru have a variable mating system that can differ both between territories at any one time and within territories over time. Groups are usually monogamous or cooperatively polyandrous, but are occasionally even polygynous. This study addressed the following questions: why does this population contain both monogamous and polyandrous groups simultaneously? What factors determine whether specific groups are monogamous or polyandrous? The data from this study population tentatively support the hypothesis that adults should mate monogramously only if they have nonreproductive helpers (usually older offspring) to help rear infants. Without helpers, the reproductive success of both males and females is hypothesized to be higher, on average, if they mate polyandrously than if they mate monogamously. The proposed benefits of polyandry to males and females differ quantitatively, but in both cases benefits stem from the help that males provide in rearing young. The following results support this hypothesis. (1) Lone pairs were never seen to attempt breeding, and calculations suggest that the costs of lactation and infant-carrying are too great for lone pairs to have a high probability of being able to raise twin offspring (the normal litter size). (2) Polyandrous males and nonreproductive offspring contributed substantially to infant care, particularly infant-carrying (fig. 2). (3) Adult males carried infants approximately twice as often as did lactating females, presumably because of the combined costs of (a) lactation (Fig. 3) and (b) infant-carrying (Fig. 4). The proximate causes of cooperative polyandry inS. fuscicollis appear to be different from those responsible in several bird species, showing that cooperative polyandry is a complex phenomenon. 相似文献