全文获取类型
收费全文 | 108篇 |
免费 | 6篇 |
国内免费 | 2篇 |
专业分类
安全科学 | 4篇 |
废物处理 | 5篇 |
环保管理 | 13篇 |
综合类 | 17篇 |
基础理论 | 34篇 |
环境理论 | 1篇 |
污染及防治 | 20篇 |
评价与监测 | 5篇 |
社会与环境 | 8篇 |
灾害及防治 | 9篇 |
出版年
2023年 | 1篇 |
2022年 | 1篇 |
2021年 | 2篇 |
2020年 | 2篇 |
2018年 | 7篇 |
2017年 | 8篇 |
2016年 | 5篇 |
2015年 | 2篇 |
2014年 | 4篇 |
2013年 | 6篇 |
2012年 | 10篇 |
2011年 | 10篇 |
2010年 | 6篇 |
2009年 | 5篇 |
2008年 | 4篇 |
2007年 | 9篇 |
2006年 | 6篇 |
2005年 | 2篇 |
2004年 | 2篇 |
2003年 | 6篇 |
2002年 | 4篇 |
2001年 | 4篇 |
2000年 | 2篇 |
1999年 | 2篇 |
1995年 | 1篇 |
1988年 | 1篇 |
1986年 | 1篇 |
1977年 | 1篇 |
1972年 | 1篇 |
1953年 | 1篇 |
排序方式: 共有116条查询结果,搜索用时 31 毫秒
81.
82.
83.
M. Tatzber M. Stemmer H. Spiegel C. Katzlberger G. Haberhauer M. H. Gerzabek 《Environmental Chemistry Letters》2007,5(1):9-12
Measurements of calcium carbonate contents in soils were performed with FT-IR (Fourier transform infrared) spectroscopy and
with the gas volumetric Scheibler method. To the authors’ knowledge it is the first time that carbonate was quantified in
soil samples by FT-IR spectroscopy. The carbonate contents of the test soils ranged from 11.3 to 13.1%. Both methods gave
similar results, however, results obtained from FT-IR spectra depend on the spectral band used for the carbonate determination.
In our investigation we used the bands at 875 and 2506 cm−1. In case of the band at 2506 cm−1 the difference between FT-IR and Scheibler method was a factor of 1.56, in case of 875 cm−1 the respective factor was 1.16. It can be concluded that FT-IR with both bands has a potential to be used in practice as
substitution of the Scheibler method. The advantages of the FT-IR method are better reproducibility and the simultaneous characterization
of soil organic matter in bulk samples. The disadvantage is its higher cost. 相似文献
84.
Significant concentrations of chlorinated pesticides such as 1,1,1-trichloro-2,2-bis(4-chlorophenyl)ethane (DDT) and its two main transformation products, 1,1-dichloro-2,2-bis(4-chlorophenyl)ethane (DDD) and 1,1-dichloro-2,2-bis(4-chlorophenyl)ethylene (DDE) are still present in soil and sediment systems more than 30 years after DDT use was banned in the United States. DDT enters waterways via the runoff from industrial point sources, agricultural lands and atmospheric deposition. We evaluated zero-valent iron (Fe(0)), ferrous sulfide (FeS), as well as combining them with hydrogen peroxide (H(2)O(2)) as viable treatment technologies for degrading DDT in an aqueous solution. Treatment of DDT with Fe(0) and FeS resulted in approximately 88% and 56% transformation of DDT within 150h, respectively. DDE production was insignificant in all systems. The DDT removal was slower with FeS than with Fe(0), but the amounts of DDD and DDE produced did not exceed baseline. Treatment with a 1:1 mixture of Fe(0)-FeS removed about 95% of the added mass of DDT within 4days and generated significant amounts of DDD and minor amounts of DDMU. When small amounts of H(2)O(2) were introduced halfway through the Fe(0) and FeS treatment times, the mass of DDT decreased by 87% and 96%, respectively, within 2days. Our results demonstrate that mixtures of Fe(0)-FeS in combination with H(2)O(2) can be used for rapid and efficient removal of DDT from aqueous solutions. 相似文献
85.
86.
FLEISHMAN E 《Environmental management》2000,26(6):685-695
Federal land managers in the western United States are interested in the potential of prescribed fire as a tool to decrease
fuel loads, increase vegetational heterogeneity, and increase faunal diversity in various ecosystems. I tested whether implementation
of a prescribed fire program by the US Forest Service in a watershed in the central Great Basin had significant effects on
butterfly species richness and composition. I monitored butterfly communities during the first two years after implementation
in five to seven burn units and controls in the watershed. To estimate baseline spatial and temporal variation in butterfly
communities in the greater ecosystem, I also monitored butterflies in five untreated canyons outside the project area. Butterfly
species richness and butterfly species composition (measured as community similarity) did not differ significantly between
burn units and controls. Geographic location had statistically significant effects on species richness. Butterfly species
composition of individual locations varied over time, as did the magnitude of that variation. These results emphasize that
standardized, repeatable monitoring protocols are vital for evaluating the effects of experimental management treatments and
for predicting and assessing the effects of future management strategies and environmental changes. 相似文献
87.
Susan K. Rope W. John Arthur III Timothy H. Craig Erica H. Craig 《Environmental monitoring and assessment》1988,10(1):1-24
Concentrations of thirty elements were measured in strong-acid extracts of soil, sagebrush (Artemisia tridentata spp.) leaves and perennial grass from the Idaho National Engineering Laboratory (INEL) and two reference sites in southern Idaho. A bicarbonate-chelating extract of soil was used to estimate plant-available concentrations. The results provide baseline data prior to start-up of a coal-fired steam generation facility on the INEL and other developments in the region. In addition, existing impact from effluents from thirty years of a nuclear fuel reprocessing facility on the INEL was evaluated. Based on the spatial distribution of element concentrations, as well as comparison with references sites, we conclude that concentrations of Zn, and perhaps Ni, Cd, and V, are currently elevated around the fuel reprocessing facility. The spatial distribution of these elements is similar to that of 137Cs in soil, a radionuclide which is emitted by the facility. Sagebrush and soil appear more responsive than perennial grass for long-term monitoring of element concentrations in this semi-arid environment. 相似文献
88.
Catalina T. Pastor-de-Ward Tamara Rubilar María E. Díaz-de-Vivar Ximena Gonzalez-Pisani Erica Zarate Marina Kroeck Enrique Morsan 《Marine Biology》2007,151(1):205-217
The starfish Cosmasterias lurida was sampled from the pier piles of Almirante Storni in the Golfo Nuevo, northern Patagonia, from November 2001 to November
2003. In this anthropogenically modified site there is an unusually abundant food supply of mussels and large aggregations
of starfishes. The reproductive cycle was studied by organ indices and histological examination of gonads. The highest gonad
index (GI) values were found in the summer (February–March), followed by a drop in GI values, indicating spawning. Histological
analyses indicated that gametogenesis takes place from June to January, sexual maturity occurred during the summer and spawning
occurred in April. The GI and pyloric caeca index (PCI) tended to have an inverse relationship, but this was only statistically
significant in males. However, biochemical analyses of the starfish indicated no transfer of nutrients between pyloric caeca
and gonads in either sex. In fact, simultaneous accumulation of carbohydrates was found in the pyloric caeca and gonads of
both sexes. 相似文献
89.
The influence of abiotic factors on the establishment and success of invasive species is often difficult to determine for
most marine ecosystems. However, examining this relationship is critical for predicting the spread of invasive species and
predicting which habitats will be most vulnerable to invasion. Here we examine the mortality and physiological sensitivity
to salinity of adult colonies of the colonial ascidians Botryllus schlosseri and Botrylloides violaceus. Adult colonies of each species were exposed to abrupt changes in salinity (5, 10, 15, 20, 25, 30 psu) in the laboratory.
Salinity ranges used in the laboratory corresponded with those of the field distributions of B. violaceus and B. schlosseri in the Great Bay Estuary, NH. Heart rate was used as a proxy for health to assess the condition of individual colonies. Heart
rates were monitored daily for approximately 2 weeks. Results revealed that both species experienced 100% mortality after
1 day at 5 psu and that their heart rates declined with decreasing salinity. Heart rates of B. schlosseri remained consistent between 15 and 30 psu and slowed at 10 psu. Heart rates of B. violaceus remained constant between 20 and 30 psu, but slowed at 15 psu. These laboratory results corresponded to the distribution
of these species in estuaries, indicating salinity is a key factor in the distribution and dominance of B. schlosseri and B. violaceus among coastal and estuarine sites. Furthermore, physiological differences to salinity were found between colonies of B. schlosseri in the Venetian Lagoon and colonies in Portsmouth Harbor, suggesting adaptation to environmental variables. 相似文献
90.
Janie L. Gittleman Author Vitae Paige C. Gardner Author Vitae Author Vitae Julie M. Sampson Author Vitae Author Vitae Erica D. Ermann Author Vitae Author Vitae Peter Y. Chen Author Vitae 《Journal of Safety Research》2010,41(3):263-281