全文获取类型
收费全文 | 1005篇 |
免费 | 162篇 |
国内免费 | 494篇 |
专业分类
安全科学 | 177篇 |
废物处理 | 20篇 |
环保管理 | 70篇 |
综合类 | 810篇 |
基础理论 | 326篇 |
污染及防治 | 139篇 |
评价与监测 | 45篇 |
社会与环境 | 59篇 |
灾害及防治 | 15篇 |
出版年
2024年 | 6篇 |
2023年 | 20篇 |
2022年 | 48篇 |
2021年 | 59篇 |
2020年 | 62篇 |
2019年 | 56篇 |
2018年 | 56篇 |
2017年 | 94篇 |
2016年 | 101篇 |
2015年 | 86篇 |
2014年 | 80篇 |
2013年 | 123篇 |
2012年 | 98篇 |
2011年 | 77篇 |
2010年 | 65篇 |
2009年 | 81篇 |
2008年 | 84篇 |
2007年 | 102篇 |
2006年 | 62篇 |
2005年 | 50篇 |
2004年 | 46篇 |
2003年 | 30篇 |
2002年 | 21篇 |
2001年 | 14篇 |
2000年 | 31篇 |
1999年 | 12篇 |
1998年 | 13篇 |
1997年 | 11篇 |
1996年 | 11篇 |
1995年 | 15篇 |
1994年 | 11篇 |
1993年 | 6篇 |
1992年 | 2篇 |
1991年 | 5篇 |
1990年 | 4篇 |
1989年 | 1篇 |
1987年 | 1篇 |
1986年 | 3篇 |
1985年 | 1篇 |
1984年 | 3篇 |
1982年 | 1篇 |
1980年 | 1篇 |
1979年 | 3篇 |
1978年 | 1篇 |
1972年 | 2篇 |
1971年 | 2篇 |
排序方式: 共有1661条查询结果,搜索用时 15 毫秒
1.
Data from 2907 transcervical CVS cases performed on singleton pregnancies were reviewed retrospectively and villus sample size was correlated with cytogenetic results, placental location, maternal age at the expected date of confinement (EDC), gestational age at the time of sampling, birth weight, gestational age at the time of delivery, and pregnancy outcome. No correlation was noted between villus sample size and maternal age, gestational age at sampling, gestational age at delivery, birth weight, or pregnancy outcome. An inverse correlation between villus sample size and percentage of abnormal cytogenetic findings was statistically significant (X2 = 8·53, p <0·01). The percentage of small samples was greater when the placenta was anterior, lateral, or fundal than when the placenta was posterior. 相似文献
2.
《环境科学学报(英文版)》2023,35(4):794-805
In this study, the effects of a diesel oxidation catalyst (DOC) coupled with a catalyzed diesel particulate filter (CDPF) with different catalyst loadings on the power, fuel consumption, gaseous and particulate emissions from a non-road diesel engine were investigated. Results showed that the after-treatment had a negligible effect on the power and fuel consumption. The reduction effect of the DOC on the CO and hydrocarbon (HC) increased with the engine load. Further reductions occurred coupling with the CDPF. Increasing the catalyst loading resulted in a more significant reduction in the HC emissions than CO emissions. The DOC could increase the NO2 proportion to 37.9%, and more NO2 was produced when coupled with the CDPF below 250°C; above 250°C, more NO2 was consumed. The after-treatment could reduce more than 99% of the particle number (PN) and 98% of the particle mass (PM). Further reductions in the PN and PM occurred with a higher CDPF catalyst loading. The DOC had a better reduction effect on the nucleation particles than the accumulation ones, but the trend reversed with the CDPF. The DOC shifted the particle size distribution (PSD) to larger particles with an accumulation particle proportion increasing from 13% to 20%, and the geometric mean diameter (GMD) increased from 18.2 to 26.0 nm. The trend reversed with the CDPF and the accumulation particle proportion declined to less than 10%. A lower catalyst loading on the CDPF led to a higher proportion of nucleation particles and a smaller GMD. 相似文献
3.
4.
Wang Xu Ma Yu Chen Hongwu Wen Gang Chen Shoujun Tao Zuyu Chung Yong-Seung 《Water, Air, & Soil Pollution: Focus》2003,3(2):67-79
With observational data spanning 1961–1999 from 90 meteorological stations in Xinjiang, China, the spatial and temporal characteristics of sandstorms and strong winds, and the contribution of strong winds to the occurrence of sandstormsare analyzed. Moreover, the dominant wind direction and minimumwind speeds during sandstorm periods are discussed. The research shows that although possessing similar climatic trends, sandstorms and strong winds in Xinjiang have opposite geographical distributions, i.e. places with more sandstorms show fewer strong winds. The contribution of strongwinds to sandstorms in northern Xinjiang is larger than that insouthern Xinjiang. The dominant wind directions clearly indicatethe paths of the weather systems that introduced the sandstorms.The minimum wind speeds in the sandstorms were over 10 ms-1in northern and eastern Xinjiang and in the Turpan and Yanqi Basins of southern Xinjiang. In Tarim Basin of southern Xinjiang,however, the minimum wind speed was about 6–8 ms-1, and even 6 ms-1 at its southern edge. 相似文献
5.
6.
北京大气颗粒物碳质组分粒径分布的季节变化特征 总被引:7,自引:0,他引:7
为了解有机碳(OC)和元素碳(EC)在北京大气颗粒物中的季节变化、粒径分布和来源,于2010年3月—2011年2月采用惯性撞击分级采样器采集大气颗粒物样品,热光碳分析仪测定其中有机碳和元素碳质量浓度.结果表明,OC在粗细粒子中含量相当,EC主要存在于细粒子中,在<2.1μm颗粒物中分别占(52±11)%和(70±22)%.OC存在明显的季节变化,冬、夏季高于春、秋季,而EC则表现为冬、秋季大于春、夏季.OC和EC粒径分布呈"双峰型",细粒子段峰值分别位于0.43—1.1μm和0.43—0.65μm,粗粒子段峰值均位于4.7—5.8μm.四季峰值对应的粒径段、峰宽和峰高存在差异.OC与EC粒径分布和相关性的季节变化表明,冬季OC与EC的主要来源为燃煤排放,夏季EC的主要来源为机动车尾气. 相似文献
7.
Seasonal and particle size-dependent variations in gas/particle partitioning of PCDD/Fs 总被引:1,自引:0,他引:1
Lee SJ Ale D Chang YS Oh JE Shin SK 《Environmental pollution (Barking, Essex : 1987)》2008,153(1):215-222
This study monitored particle size-dependent variations in atmospheric polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs). Two gas/particle partitioning models, the subcooled liquid vapor pressure (P(L)(0)) and the octanol-air partition coefficient (K(OA)) model, were applied to each particle sizes. The regression coefficients of each fraction against the gas/particle partition coefficient (K(P)) were similar for separated particles within the same sample set but differed for particles collected during different periods. Gas/particle partitioning calculated from the integral of fractions was similar to that of size-segregated particles and previously measured bulk values. Despite the different behaviors and production mechanisms of atmospheric particles of different sizes, PCDD/F partitioning of each size range was controlled by meteorological conditions such as atmospheric temperature, O(3) and UV, which reflects no source related with certain particle size ranges but mixed urban sources within this city. Our observations emphasize that when assessing environmental and health effects, the movement of PCDD/Fs in air should be considered in conjunction with particle size in addition to the bulk aerosol. 相似文献
8.
Factors affecting river health and its assessment over broad geographic ranges: the Western Australian experience 总被引:1,自引:0,他引:1
Halse SA Scanlon MD Cocking JS Smith MJ Kay WR 《Environmental monitoring and assessment》2007,134(1-3):161-175
AusRivAS is an Australia-wide program that measures river condition using predictive models to compare the macroinvertebrate
families occurring at a river site with those expected if the site were in natural condition. Results of assessment of 685
sites across all major rivers in Western Australia are presented. Most rivers were in relatively natural condition in the
northern half of the state where the human population is low and pastoralism is the major land use. In the south, where the
human population is higher and agriculture is more intensive, rivers were mostly more disturbed. AusRivAS assessment produced
some erroneous results in rivers of the south-west cropping zone because of the lack of appropriate reference site groups
and biased distribution of sampling sites. Collecting low numbers of animals from many forested streams, because of low stream
productivity and samples that were difficult to sort, also affected assessments. Overall, however, AusRivAs assessment identified
catchment processes that were inimical to river health. These processes included salinisation, high nutrient and organic loads,
erosion and loss of riparian vegetation. River regulation, channel modification and fire were also associated with river degradation.
As is the case with other assessment methods, one-off sampling at individual sites using AusRivAS may be misleading. Seasonal
drought, in particular, may make it difficult to relate conditions at the time of sampling to longer-term river health. AusRivAS
has shown river condition in Western Australia is not markedly different from other parts of Australia which, as a whole,
lacks the substantial segments of severely degraded river systems reported in England. 相似文献
9.
Male willow warblers have song repertoires which vary in complexity along several dimensions. We examined whether female choice,
as measured by date of pairing, was based on these song characteristics in 4 different years. Pairing date was negatively
correlated with song repertoire size in 1 year, and with song versatility in another year, but there was no consistent effect
of any song characteristic on pairing throughout the years or in the pooled sample. The variable that best explained how soon
a male pairs is male arrival date (only males that had settled territories before the first female arrived were considered
in the analysis). This correlation is consistently significant in all years. This is most parsimoniously interpreted as females
choosing some habitat characteristic in the same way that males do. A small percentage of males (8.3%) attracted and paired
with a second female. The likelihood of becoming polygynous was not explained by any measured song characteristic, but it
was related to arrival date: early males were more likely to pair with two females. Males with large repertoires fledged more
young in their primary nests, and there was a trend for the offspring of these males to have a greater probability of being
recruited into the population. In conclusion, the results show that in most years there is no sexual selection by female preference
on song characteristics, although the data on reproductive success is consistent with the idea of repertoire size being an
indicator of male quality.
Received: 4 June 1999 / Received in revised form: 1 December 1999 / Accepted: 31 December 1999 相似文献
10.
Most studies of social polygyny in birds have examined male provisioning on the basis of the number of feeding visits. This
may be misleading if males compensate for infrequent visits by bringing larger prey at each visit. We investigated nestling
provisioning in the socially polygynous great reed warbler, Acrocephalus arundinaceus, in south Central Sweden in 1996–1997. We collected data on rate of feeding visits, prey size and the amount of biomass delivered
by males and females. Males had lower rates of feeding visits and provided smaller prey to nestlings in secondary than in
monogamous and primary nests. Secondary females had higher rates of feeding visits and brought larger prey than monogamous
and primary females. These results confirm that secondary females face a potential cost of polygyny through a lower rate of
male feeding, and that this cost was reinforced by the significantly lower male provisioning rate (biomass h–1) at secondary nests. Secondary females compensated for the lack of male assistance by increasing their rate of feeding and
bringing larger prey. As a result, offspring in nests of secondary females received as much food as did those in nests of
primary females. Prey load size increased with the parent’s proportion of feeding visits, suggesting that parents use different
feeding strategies depending on their amount of responsibility for nestling provisioning. We suggest that parents which take
the main responsibility for nestling feeding have to forage further away from the nest, and based on optimal-foraging theory,
they should then on average bring larger prey to their nest.
Received: 4 April 1999 / Received in revised form: 12 October 1999 / Accepted: 23 October 1999 相似文献