全文获取类型
收费全文 | 1212篇 |
免费 | 64篇 |
国内免费 | 36篇 |
专业分类
安全科学 | 71篇 |
废物处理 | 79篇 |
环保管理 | 91篇 |
综合类 | 830篇 |
基础理论 | 107篇 |
污染及防治 | 41篇 |
评价与监测 | 41篇 |
社会与环境 | 41篇 |
灾害及防治 | 11篇 |
出版年
2024年 | 1篇 |
2023年 | 15篇 |
2022年 | 13篇 |
2021年 | 25篇 |
2020年 | 21篇 |
2019年 | 19篇 |
2018年 | 20篇 |
2017年 | 20篇 |
2016年 | 23篇 |
2015年 | 23篇 |
2014年 | 16篇 |
2013年 | 56篇 |
2012年 | 46篇 |
2011年 | 57篇 |
2010年 | 51篇 |
2009年 | 55篇 |
2008年 | 52篇 |
2007年 | 57篇 |
2006年 | 49篇 |
2005年 | 61篇 |
2004年 | 53篇 |
2003年 | 56篇 |
2002年 | 58篇 |
2001年 | 35篇 |
2000年 | 3篇 |
1999年 | 6篇 |
1998年 | 4篇 |
1997年 | 4篇 |
1996年 | 132篇 |
1995年 | 60篇 |
1994年 | 46篇 |
1993年 | 25篇 |
1992年 | 17篇 |
1991年 | 30篇 |
1990年 | 12篇 |
1989年 | 11篇 |
1988年 | 19篇 |
1987年 | 13篇 |
1986年 | 6篇 |
1985年 | 11篇 |
1984年 | 11篇 |
1983年 | 6篇 |
1982年 | 5篇 |
1981年 | 4篇 |
1980年 | 1篇 |
1979年 | 1篇 |
1977年 | 1篇 |
1974年 | 1篇 |
1973年 | 1篇 |
排序方式: 共有1312条查询结果,搜索用时 0 毫秒
101.
巨化集团公司锦纶厂逐步推行清洁生产,从原材料的选择、工艺改造、设备更新、综合利用、节约用水、加强管理等各方面采取了一系列措施,经两年努力,使企业扭亏为盈。实践证明,推行清洁生产是化工企业减亏增盈和防治污染的有效途径。 相似文献
102.
动用多指标综合排序的双基点法,建立了环境治理工程评标的数学模型。应用实例表明,该模型可以为环境治理工程评标提供客观、合理的方法。 相似文献
103.
In the case-control study of 118 women with autosomal trisomy identified at prenatal diagnosis and their 442 karyotypically normal matched controls, we found that there was no overall association between risk of trisomy and the presence of vaginal bleeding during pregnancy. However, a lengthy duration of bleeding appears to predict increased risk of trisorny. 相似文献
104.
Objective
To examine parental decisions about vehicles driven by teenagers and parental knowledge of vehicle safety.Methods
About 300 parents were interviewed during spring 2006 in Minnesota, North Carolina, and Rhode Island while teenagers took their first on-road driving tests.Results
Fewer than half of parents surveyed said teenagers would be the primary drivers of the chosen vehicles. Parents most often cited safety, existing family vehicle, and reliability when explaining the choices for their teenagers’ vehicles. About half of the vehicles intended for teenagers were small/mini/sports cars, pickups, or SUVs — vehicles considered less safe for teenagers than midsize/large cars or minivans. A large majority of vehicles were 2001 models or earlier. Vehicles purchased in anticipation of adding a new driver to the family were more likely to be the sizes/types considered less safe than vehicles already owned. Few parents insisted on side airbags or electronic stability control, despite strong evidence of their safety benefits. Even when asked to identify ideal vehicles for their teenagers to drive, about half of parents identified less safe vehicle sizes/types. Most parents knew that midsize/large vehicles are safer than small vehicles, and at least half of parents said SUVs and pickups are not safe for teenage drivers, citing instability.Conclusions
The majority of parents understood some of the important criteria for choosing safe vehicles for their teenagers. However, parents actually selected many vehicles for teenagers that provide inferior crash protection.Impact on industry
Vehicle safety varies substantially by vehicle size, type, and safety features. Many teenagers are driving inferior vehicles in terms of crashworthiness and crash avoidance. 相似文献105.
突发性环境污染事故应急预警系统发展探讨 总被引:28,自引:5,他引:28
在介绍突发性环境污染事故的概念、类型与特性的基础上,综述了近年来国内外对这一领域的研究进展.并结合“5S”技术提出突发性环境污染事故应急预警系统的全程模拟。 相似文献
106.
分光光度法测定染色废水的色度 总被引:3,自引:0,他引:3
为消除测定染色废水色度的主观误差,采用分光光度法测定染色废水的色度,与稀释倍数法相比,具有精确,重现性好,适用范围广等特点,PH值对色度的测定有明显影响,控制PH值为7.60,测定色度具有可比性。 相似文献
107.
108.
Beryl R. Benacerraf 《黑龙江环境通报》2010,30(7):644-652
This review summarizes the development, history and use of second-trimester sonographic markers for the detection of fetal Down syndrome over three decades. Starting with the nuchal fold thickening in 1985 and culminating in the genetic sonogram in the 1990s. The combination of second-trimester serum screening with the ultrasound markers improved the detection rate of affected fetuses but also allowed patients to decrease their risk of carrying a fetus with Down syndrome if the genetic sonogram was normal. More recently the role of the genetic sonogram and its markers have changed with the wide spread use of first-trimester screening. This prior screening ultimately decreases the prevalence of fetal Down syndrome in the second trimester to less than 85% of what it was in the first-trimester as most fetuses with Down syndrome are now identified early. Current interpretation of the second-trimester Down syndrome markers must be based on the result of the first trimester and combined screening to achieve the most accurate risk estimate of an affected fetus. Copyright © 2010 John Wiley & Sons, Ltd. 相似文献
109.
110.