全文获取类型
收费全文 | 14332篇 |
免费 | 867篇 |
国内免费 | 4683篇 |
专业分类
安全科学 | 1049篇 |
废物处理 | 786篇 |
环保管理 | 1083篇 |
综合类 | 7999篇 |
基础理论 | 2312篇 |
环境理论 | 1篇 |
污染及防治 | 4532篇 |
评价与监测 | 712篇 |
社会与环境 | 867篇 |
灾害及防治 | 541篇 |
出版年
2024年 | 42篇 |
2023年 | 273篇 |
2022年 | 784篇 |
2021年 | 693篇 |
2020年 | 621篇 |
2019年 | 544篇 |
2018年 | 558篇 |
2017年 | 684篇 |
2016年 | 703篇 |
2015年 | 770篇 |
2014年 | 1044篇 |
2013年 | 1373篇 |
2012年 | 1166篇 |
2011年 | 1191篇 |
2010年 | 946篇 |
2009年 | 865篇 |
2008年 | 1010篇 |
2007年 | 765篇 |
2006年 | 796篇 |
2005年 | 549篇 |
2004年 | 448篇 |
2003年 | 501篇 |
2002年 | 475篇 |
2001年 | 377篇 |
2000年 | 428篇 |
1999年 | 383篇 |
1998年 | 326篇 |
1997年 | 295篇 |
1996年 | 256篇 |
1995年 | 199篇 |
1994年 | 167篇 |
1993年 | 158篇 |
1992年 | 138篇 |
1991年 | 99篇 |
1990年 | 51篇 |
1989年 | 45篇 |
1988年 | 38篇 |
1987年 | 16篇 |
1986年 | 22篇 |
1985年 | 11篇 |
1984年 | 11篇 |
1983年 | 6篇 |
1982年 | 17篇 |
1981年 | 8篇 |
1979年 | 3篇 |
1978年 | 7篇 |
1974年 | 3篇 |
1973年 | 4篇 |
1972年 | 5篇 |
1970年 | 2篇 |
排序方式: 共有10000条查询结果,搜索用时 46 毫秒
191.
192.
193.
194.
水解酸化—厌氧工艺处理高浓度抗生素废水研究 总被引:10,自引:0,他引:10
研究了水解酸化与厌氧消化组合工艺处理高浓度抗生素废水,结果表明,水解酸化反应器最大CODcr容积负荷达到 16.84kg/m3·d,复合厌氧反应器CODcr容积负荷达到8.57kg/m3·d;系统进水SO42-浓度为1325mg/L,CODcr/SO42-值最低达到 3;CODCr与SO42-总去除率分别为75.5%和95.2%,对各种抑制物质和冲击负荷表现出很好的适应性。 相似文献
195.
Antibiotics have been identified as obesogens contributing to the prevalence of obesity. Moreover, their environmental toxicity shows sex dependence, which might also explain the sex-dependent obesity observed. Yet, the direct evidence for such a connection and the underlying mechanisms remain to be explored. In this study, the effects of tetracycline, which is a representative antibiotic found in both environmental and food samples, on Drosophila melanogaster were studied with consideration of both sex and circadian rhythms (represented by the eclosion rhythm). Results showed that in morning-eclosed adults, tetracycline significantly stimulated the body weight of females (AM females) at 0.1, 1.0, 10.0 and 100.0 µg/L, while tetracycline only stimulated the body weight of males (AM males) at 1.0 µg/L. In the afternoon-eclosed adults, tetracycline significantly stimulated the body weight of females (PM females) at 0.1, 1.0 and 100.0 µg/L, while it showed more significant stimulation in males (PM males) at all concentrations. Notably, the stimulation levels were the greatest in PM males among all the adults. The results showed the clear sex dependence of the obesogenic effects, which was diminished by dysrhythmia. Further biochemical assays and clustering analysis suggested that the sex- and rhythm-dependent obesogenic effects resulted from the bias toward lipogenesis against lipolysis. Moreover, they were closely related to the preference for the energy storage forms of lactate and glucose and also to the presence of excessive insulin, with the involvement of glucolipid metabolism. Such relationships indicated potential bridges between the obesogenic effects of pollutants and other diseases, e.g., cancer and diabetes. 相似文献
196.
Fugitive road dust (FRD) contributes a great deal to urban rainwater and air pollution and is commonly controlled by water-sprinkling in most Chinese cities. However, there is a lack of information on its effectiveness. We used the Testing Re-entrained Aerosol Kinetic Emissions from Roads (TRAKER) method to monitor different types of roads in Baoding city before and within 1 hr after water-sprinkling and obtained the road dirtiness index (a) and PM concentration in the road environment (), to evaluate the removal efficiency for PM deposited on the road surface () and the reduction efficiency for the PM concentration in the road environment (). The results give that the for three types of roads is ranked: branch road (87%-–100%) > major arterial road (80%-83%) > minor arterial road (68%-77%), and the ranked: minor arterial road (70%) > branch road (46%-58%) > major arterial road (37%-53%). The and varied non-linearly with time and presented a quadratic curve. The average effective control time (> 0) was 62 min on the major and minor arterial roads, and much longer than 1 hr on branch roads. The values diminished completely by 72 min on average from the end of sprinkling for the three types of roads. Water-sprinkling can remove PM10 particles from the road surface and reduce their concentration in the road environment more thoroughly than PM2.5. Our findings could be helpful for controlling urban FRD emissions more efficiently and precisely. 相似文献
197.
城市污水厂污泥由于产生量大且成分复杂,如何对它进行稳定化、无害化处理已越来越受到人们的关注。本研究基于好氧发酵仓式堆肥系统,研究了城市污泥处理过程中温度、含水率、pH、有机质、水溶性有机碳、总氮和发芽指数等指标参数的变化规律。研究结果表明:当物抖初始含水率控制在65%左右时,在强制通风量112.5m^3/12hr,搅拌频率30min/24hr的工艺条件下,堆肥过程可以实现顺利升温并在55℃以上维持3天,满足杀灭致病茵要求的条件;14天反应用期结束时,物抖含水率、水溶性有机碳和有机质含量显著降低,堆肥产品腐熟,卫生学指标达到了美国EPA污泥产品A类标准;得列的污泥产品成为性质优良的土壤质量调节荆。 相似文献
198.
Richard Louis Edmonds 《环境科学学报(英文版)》1989,1(1):1-14
Environmental problems in China can be divided into two large classes: pollution and destruction of natural environment. Environmental degradation is particularly serious in areas with rapid population growth. In this paper, some of China's major environmental problems, particularly those concerned with land, forests, and continental waters are introduced in order to see how population growth and management have affected these resources over the past few decades. It is also explained how the Chinese plan to cope and eventually solve these problems. 相似文献
199.
本法用Ag/S离子选择电极测定废水中的硫化物,测定浓度范围0.1~1000.0mg/l,方法精密度为4.3%,回收率为P2.5%,检出限为0.1mg/l。大多数离子不干扰测定,该法简便快速,适用于例行监测。 相似文献
200.
速灭菊酯在水稻-水-鱼系统中的动态 总被引:11,自引:1,他引:11
采用同位素示踪技术和模拟生态系统试验法,对水田施用速灭菊酯后对邻近水域的污染、水域中鱼类对速灭菊酯残留物的浓缩和排除等进行了研究,结果表明,在田表水中,残留物浓度随处理后时间而迅速降低。水系中淤泥对水中残留物有明显的吸附净化作用,鱼对水中速灭菊酯残留物的摄取和排除均很迅速。 用二室模型对速灭菊酯残留物在田表水中的消失、用一级输入和输出的单室模型对鱼体中残留物浓度随时间的变化动态研究表明,在田表水中,土壤对水中残留物起着强烈的吸附净化作用;在水系中,鱼体中残留物浓度的消长主要取决于残留物自身在水中的消失速率,只是在前期同时依赖于鱼体对残留物的排除效应,鱼体的摄入常数只对鱼体累积浓度最大值及到达最大值的时间T_m产生影响。 相似文献