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排序方式: 共有159条查询结果,搜索用时 31 毫秒
71.
内蒙古自治区煤炭储量位居全国首位,同时又属于严重缺水地区,煤化工、盐化工等化工废水零排放为成了热点话题。浓盐水的处理成为制约化工废水零排放的关键技术。介绍了浓盐水的处理技术及存在的问题同时对主要处理技术的投资行进了比较分析。 相似文献
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沈阳市冬季一次典型大气污染过程特征和成因分析 总被引:1,自引:1,他引:0
2013年11月18日~25日沈阳地区出现一次典型空气污染过程。采用单颗粒气溶胶质谱仪(SPAMS),并结合气象条件分析了该次污染的成因和细颗粒物的污染特征。结果表明,不利于污染物扩散的气象条件是重污染发生的主要原因,低空排放的积累可能是造成这次污染的又一重要原因。从细颗粒物成分上看,污染过程中有机碳颗粒占比明显增加,有机物污染较为严重,颗粒物间混合加剧;从来源上看,机动车尾气、工业排放和燃煤的占比较高。 相似文献
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双台子河口国家自然保护区红海滩景观退化机制研究 总被引:8,自引:0,他引:8
双台子河口国家自然保护区的红海滩景观由生长在潮间带的天然翅碱篷(Suaeda heteroptera)群落形成,是世界上数量最大的黑嘴鸥(Larus saundersi)的觅食和繁殖场所.近年来,由于翅碱篷群落大面积萎缩,黑嘴鸥数量急剧减少.通过现场监测和实验模拟,对潮间带翅碱蓬群落的生态学特性和红海滩景观退化机制进行了研究.潮间带翅碱篷是一种非常特殊的植物群落,只生长在特定标高的有周期性潮汐作用的滩涂上,过高或过低均不能生长.潮汐是保证翅碱篷在高盐度潮间带正常生长的重要自然力,可以及时洗脱翅碱篷排出体外的大量盐分,避免盐分结晶形成盐鞘使植物受害死亡.研究发现,潮间带翅碱篷群落退化的原因是由于滩涂因泥沙沉积抬升,潮位降低造成的,而拦海坝的修筑是导致滩涂快速升高的直接原因.采取必要的工程措施,翅碱篷群落是可以人工恢复的. 相似文献
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Amos P.K. Tai Loretta J. Mickley Daniel J. Jacob 《Atmospheric environment (Oxford, England : 1994)》2010,44(32):3976-3984
We applied a multiple linear regression (MLR) model to study the correlations of total PM2.5 and its components with meteorological variables using an 11-year (1998–2008) observational record over the contiguous US. The data were deseasonalized and detrended to focus on synoptic-scale correlations. We find that daily variation in meteorology as described by the MLR can explain up to 50% of PM2.5 variability with temperature, relative humidity (RH), precipitation, and circulation all being important predictors. Temperature is positively correlated with sulfate, organic carbon (OC) and elemental carbon (EC) almost everywhere. The correlation of nitrate with temperature is negative in the Southeast but positive in California and the Great Plains. RH is positively correlated with sulfate and nitrate, but negatively with OC and EC. Precipitation is strongly negatively correlated with all PM2.5 components. We find that PM2.5 concentrations are on average 2.6 μg m?3 higher on stagnant vs. non-stagnant days. Our observed correlations provide a test for chemical transport models used to simulate the sensitivity of PM2.5 to climate change. They point to the importance of adequately representing the temperature dependence of agricultural, biogenic and wildfire emissions in these models. 相似文献
79.
Tagetes erecta has a high potential for cadmium (Cd) phytoremediation. Through several hydroponic experiments, characteristics of 108Cd distribution and accumulation were investigated in T. erecta with split -roots or removed xylem/phloem. The results showed that 108Cd transport from roots to aboveground tissues showed the homolateral transport phenomenon in split-root seedlings. 108Cd content of leaves on the +108Cd side and the −108Cd side was not significantly different, which implied that there was horizontal transport of 108Cd from the +108Cd side to the −108Cd side in cut-root seedlings. Like 108Cd transport, the transport of 70Zn was homolateral. Reduction of water consumption in the removed xylem treatment significantly decreased 108Cd accumulation; whereas, the removed phloem treatment had no significant effect on water consumption, but did decrease 108Cd accumulation in leaves of the seedlings. The removal of phloem significantly reduced distal leaf 108Cd content, which was significantly lower than that in the basal leaves in both the split-root and unsplit-root seedlings. Overall, the results presented in this study revealed that the root to aboveground cadmium translocation via phloem is as an important and common physiological process as xylem determination of the cadmium accumulation in stems and leaves of marigold seedlings. 相似文献
80.
Ping Zhang Li M. Wang Tai F. Lin Xiao D. Wei Xiao Y. Liu 《Journal of environmental science and health. Part. B》2013,48(9):561-566
ABSTRACTA rapid and quantitative method for the determination of N6-Benzylademine (N6-BA) was established through the application of surface-enhanced Raman spectroscopy (SERS). The Raman peak intensities of N6-BA at 1002 cm?1 positively correlated to N6-BA concentrations in sprout extracts. The R2 reached 0.99, and RSDs calculated below 10% at the concentration range of 0.1 ~5μg mL?1. The average recoveries were 80.0% ~ 98.2% for blank samples intentionally contaminated at differing levels of 0.04, 0.4, and 1 μg g?1. The whole procedure, including sample preparation and SERS detection, did not exceed 30 min for a set of 6 samples. This study indicates that SERS is a promising technique for rapid tracing analysis and on-site testing of N6-BA. 相似文献