全文获取类型
收费全文 | 1617篇 |
免费 | 84篇 |
国内免费 | 283篇 |
专业分类
安全科学 | 140篇 |
废物处理 | 70篇 |
环保管理 | 186篇 |
综合类 | 559篇 |
基础理论 | 209篇 |
污染及防治 | 612篇 |
评价与监测 | 106篇 |
社会与环境 | 74篇 |
灾害及防治 | 28篇 |
出版年
2024年 | 5篇 |
2023年 | 31篇 |
2022年 | 69篇 |
2021年 | 57篇 |
2020年 | 44篇 |
2019年 | 32篇 |
2018年 | 44篇 |
2017年 | 64篇 |
2016年 | 53篇 |
2015年 | 59篇 |
2014年 | 84篇 |
2013年 | 172篇 |
2012年 | 106篇 |
2011年 | 126篇 |
2010年 | 95篇 |
2009年 | 82篇 |
2008年 | 103篇 |
2007年 | 103篇 |
2006年 | 87篇 |
2005年 | 77篇 |
2004年 | 62篇 |
2003年 | 59篇 |
2002年 | 65篇 |
2001年 | 83篇 |
2000年 | 48篇 |
1999年 | 37篇 |
1998年 | 13篇 |
1997年 | 24篇 |
1996年 | 10篇 |
1995年 | 13篇 |
1994年 | 11篇 |
1993年 | 6篇 |
1992年 | 11篇 |
1991年 | 13篇 |
1990年 | 3篇 |
1989年 | 2篇 |
1988年 | 4篇 |
1986年 | 2篇 |
1985年 | 3篇 |
1984年 | 4篇 |
1983年 | 3篇 |
1982年 | 3篇 |
1981年 | 6篇 |
1980年 | 1篇 |
1979年 | 2篇 |
1977年 | 1篇 |
1973年 | 1篇 |
1960年 | 1篇 |
排序方式: 共有1984条查询结果,搜索用时 31 毫秒
511.
Sushila Krishnaswamy - Chang 《Environmental monitoring and assessment》1997,44(1-3):487-502
The flagellae of the unicellular marine algae Dunaliella bioculata and the freshwater Chlamydomonas resemble very much the cilia lining the bronchial tubes in human lungs. Lindane the commercial product containing 99% of the isomer of hexachlorocyclohexane was tested at various concentrations on the two algae.The concentrations of Lindane tested (5ppm - 30ppm) proved to be cytotoxic and also had a remarkable effect on the motility of both Dunaliella bioculata and Chlamydomonas. The , and isomers of lindane showed similar efects on Dunaliella bioculata.Cytoxicity was measured by growth curves and motility was quantified by microcinematography and Doppler laser velocimetry methods.At low concentrations of all the isomers (5-10 ppm), there was an acceleration of movement which lasted for 5 minutes followed by rapid deceleration of movement.Dunaliella was tested with the ionophore (mobile ion carrier) A23187 for calcium at concentration of (10-5M). The results were compared with that of Dunaliella with lindane at 15ppm and a combination of lindane (15ppm) and Ionophore A23187 (10-5M).The results show that the ionophore A23187 (10-5M) enhances the effect of lindane on the motility of Dunaliella. This could suggest that lindane induced effects may be due to interferences with the intracellular calcium flux. 相似文献
512.
This study assessed the daily exposure to dioxin using comparable approach methods in order to predict the human health risks of dioxin on the general adult population and incinerator workers in Korea. The health risk assessment of dioxin involved four scenarios (General-Direct, General-Breast Milk, General-Blood, and Worker-Blood). The risks were described in terms of the excess cancer risk and the MOEs (Margin-Of-Exposure) for cancer, reproductive dysfunctions, endometriosis, and neurobehavioral effects. The adult daily intake (General-Direct) of dioxin was estimated to be 0.50 pg-TEQ/kg-day based on the dioxin concentrations in the environmental media and foods in Korea. The average dioxin concentrations in General-Breast Milk, General-Blood, and Worker-Blood were 15.13 pg-TEQ/g fat, 14.57 pg-TEQ/g lipid, and 22.90 pg-TEQ/g lipid, respectively. The lifetime average daily doses (LADDs) of dioxin for General-Breast Milk, General-Blood, and Worker-Blood were estimated to be 1.35 pg-TEQ/kg day, 0.99 pg-TEQ/kg day, and 1.15 pg-TEQ/kg day, respectively. Although the estimated risks of cancer and reproductive dysfunctions were not unusually high in any of the four scenarios, the MOE values for the neurobehavioral effects on infants were not sufficiently high to guarantee the safety against this endpoint. 相似文献
513.
嫩江—齐齐哈尔江段几种蚌类重金属残毒水平 总被引:2,自引:0,他引:2
通过对嫩江几种蚌类不同部位重金属残毒分析,得了3种蚌类中背角无齿蚌的富集能力最强,不同部位中,足对总汞的富集能力强,外套膜对镉的富集能力最强,而鳃对铅,铜,锌富集能力最强。 相似文献
514.
提出了用于水处理的Ca(OH)_2-PDADMA-PAM新方法,采用核法对兰州制革厂综合废水进行絮凝处理的研究.实验结果表明,该法对污染物的去除率高,絮凝剂用量少,沉降速度快,产生的污泥量小,并对多种水质的处理具有适用性. 相似文献
515.
进行了南水北调湖北库区水污染防治对策研究,结果认为,库区主要环境问题是COD及富营养化物质污染,个别河流存在,着汞污染问题,综合整 重点是加强重点工业源COD治理与生活污水集中处理,通过协调上下游关系解决汞污染问题;在工程治理的基础上尚需加强管理,推行总量控制排污许可证制度使库区各河流满足中线工程提出的水质标准。 相似文献
516.
517.
At three stations in Bahamas waters, in 1989, 15 to 30% of all the dinoflagellates >20µm diameter observed in near-surface waters fluoresced green under blue excitation light, 55 to 66% fluoresced red, and the remainder did not fluoresce at all. The abundance of these green-fluorescing dinoflagellates ranged from ca 5 to 10 cells l–1 at the study sites. Under UV excitation, however, the dinoflagellates had a blue to blue-green appearance. Almost all the blue-green fluorescing dinoflagellates appeared to be heterotrophic, except for one species,Phalacroma rapa Stein, which also contained red-fluorescing (under blue light) chlorophylla. The emission spectra from all species examined were of three basic types. Type 1 typically had two fluorescence emission peaks (ca 440 and ca 510 nm). Type 2 spectra possessed one sharp peak at 495 nm. Spectra belonging to Type 3 had a broad peak around 470 to 480 nm. The green fluorescence thus is likely caused by different substances in individual species. The attempt to reconstitute observed spectra with nicotinamide adenine dinucleotide (NADH) and riboflavin 5-phosphate (FMN) solutions was unsuccessful. 相似文献
518.
Processing and Physical Properties of Plastics Made from Soy Protein Polyester Blends 总被引:6,自引:0,他引:6
Blending soy protein with polyesters using a polyvinyllactam as a compatibilizer successfully made soy protein-based plastics. The polyesters used to produce blends included polycaprolactone (PCL) and Biomax (a commercial biodegradable polyester). The blends were processed by compounding extrusion and injection molding. Blends containing soy protein/Biomax-poly(vinyl alcohol) had tensile strengths ranging from 16–22 MPa, with samples containing larger percentages of the synthetic polymer exhibiting greater strengths. Blends made from soy protein, Biomax, and PCL had tensile strengths ranging from 27–33 MPa. All the blends had high Young's moduli but demonstrated brittle characteristics as evident from their low elongations at break, ranging from 1.8–3.1%. Plastics made from soy protein/polyester blends exhibited low water absorption and had good stability under ambient conditions relative to the plastics made from soy protein alone. Blends made from soy protein flour produced plastics with the lowest water absorption. 相似文献
519.
绿色贸易壁垒能促进广大发展中国家不断提高产品的环境保护水平,保护本国的生态环境,但在环保大潮的冲击下,一些贸易企业会由于产品不符合要求而面临出口困境。本文以绿色贸易壁垒产生的原因及应采取的措施等方面进行论述,指出绿色贸易壁垒既是挑战又是机遇,要正确认识绿色贸易壁垒。 相似文献
520.