全文获取类型
收费全文 | 16905篇 |
免费 | 1185篇 |
国内免费 | 4051篇 |
专业分类
安全科学 | 1280篇 |
废物处理 | 357篇 |
环保管理 | 4324篇 |
综合类 | 9562篇 |
基础理论 | 1806篇 |
环境理论 | 3篇 |
污染及防治 | 2045篇 |
评价与监测 | 1701篇 |
社会与环境 | 844篇 |
灾害及防治 | 219篇 |
出版年
2024年 | 64篇 |
2023年 | 293篇 |
2022年 | 468篇 |
2021年 | 473篇 |
2020年 | 559篇 |
2019年 | 455篇 |
2018年 | 421篇 |
2017年 | 650篇 |
2016年 | 804篇 |
2015年 | 836篇 |
2014年 | 853篇 |
2013年 | 1242篇 |
2012年 | 1211篇 |
2011年 | 1338篇 |
2010年 | 923篇 |
2009年 | 986篇 |
2008年 | 777篇 |
2007年 | 1181篇 |
2006年 | 1092篇 |
2005年 | 851篇 |
2004年 | 750篇 |
2003年 | 772篇 |
2002年 | 648篇 |
2001年 | 547篇 |
2000年 | 522篇 |
1999年 | 456篇 |
1998年 | 343篇 |
1997年 | 296篇 |
1996年 | 279篇 |
1995年 | 235篇 |
1994年 | 209篇 |
1993年 | 198篇 |
1992年 | 147篇 |
1991年 | 111篇 |
1990年 | 89篇 |
1989年 | 86篇 |
1988年 | 76篇 |
1987年 | 73篇 |
1986年 | 47篇 |
1984年 | 49篇 |
1983年 | 56篇 |
1982年 | 63篇 |
1981年 | 75篇 |
1980年 | 81篇 |
1979年 | 76篇 |
1978年 | 53篇 |
1977年 | 47篇 |
1973年 | 46篇 |
1972年 | 40篇 |
1971年 | 58篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
141.
Damiens G Mouneyrac C Quiniou F His E Gnassia-Barelli M Roméo M 《Environmental pollution (Barking, Essex : 1987)》2006,140(3):492-499
Larval stages of bivalve molluscs are highly sensitive to pollutants. Oysters from a hatchery from Normandy (English Channel) were induced to spawn, and fertilized eggs were exposed to copper or cadmium for 24 h. Metal accumulation (from 0.125 to 5 microg Cu L(-1) and from 25 to 200 microg Cd L(-1)) and MT concentrations were measured in larvae. Compared to controls, larvae accumulated copper and cadmium with an increase in MT concentrations particularly with cadmium (i.e. 130.96 ng Cu (mg protein)(-1) and 12.69 microg MT (mg protein)(-1) at 1 microg Cu L(-1) versus 23.19 ng Cu (mg protein)(-1) and 8.92 microg MT (mg protein)(-1) in control larvae; 334.3 ng Cd (mg protein)(-1) and 11.70 microg MT (mg protein)(-1) at 200 microg Cd L(-1) versus 0.87 ng Cd (mg protein)(-1) and 4.60 microg MT (mg protein)(-1) in control larvae). Larvae were also obtained from oysters of a clean area (Arcachon Bay) and a polluted zone (Bidassoa estuary) and exposed to copper in the laboratory, their MT concentration was measured as well as biomarkers of oxidative stress. Biomarker responses and sensitivity to copper for the larvae from Arcachon oysters were higher than for those from Bidassoa. 相似文献
142.
143.
144.
微絮凝-超滤工艺处理微污染水源水的中试研究 总被引:2,自引:0,他引:2
进行了微絮凝.超滤工艺处理微污染水源水的中试研究。试验结果表明:在微絮凝-超滤工艺中,相同混凝剂投加量(相同金属摩尔浓度)下铁盐比铝盐的混凝效果好;微絮凝-超滤工艺的最佳絮凝时间为120s左右;最佳混凝剂投加量为2.2mg/L(以Fe计)。微絮凝-超滤工艺在改善出水水质和缓解膜污染方面均优于直接超滤工艺。微絮凝-超滤工艺的出水水质均符合建设部《城市供水水质标准》(CJ/T206-2005)要求。 相似文献
145.
New data on the vapour pressures and aqueous solubility of 1,8-dichlorooctane and 1,8-dibromooctane are reported as a function of temperature between 20 °C and 80 °C and 1 °C and 40 °C, respectively. For the vapour pressures, a static method was used during the measurements which have an estimated uncertainty between 3% and 5%. The aqueous solubilities were determined using a dynamic saturation column method and the values are accurate to within ±10%. 1,8-Dichlorooctane is more volatile than 1,8-dibromooctane in the temperature range covered (psat varies from 3 to 250 Pa and from 0.53 to 62 Pa, respectively) and is also approximately three times more soluble in water (mole fraction solubilities at 25 °C of 5.95 × 10−7 and 1.92 × 10−7, respectively). A combination of the two sets of data allowed the calculation of the Henry’s law constants and the air water partition coefficients. A simple group contribution concept was used to rationalize the data obtained. 相似文献
146.
Occurrences of pharmaceutical and personal care products as micropollutants in rivers from Romania 总被引:15,自引:0,他引:15
Moldovan Z 《Chemosphere》2006,64(11):1808-1817
The occurrence of pharmaceutical and personal care products (PPCPs) was investigated in the Somes River. The aim of this study was to obtain a first overview about the contamination of Somes River (Transylvania) with PPCPs. The samples were preconcentrated by Solid Phase Extraction (SPE) procedures and analysed by GC/MS. A number of 15 compounds including pharmaceutics, metabolites, intermediates and musk fragrances were detected in concentration ranging from 30 ng/l to 10 μg/l. The detected pharmaceuticals are included in following therapeutic groups: analgesics, antiepileptics, psychiatric, stimulants, anticoagulants, antineoplastic and disinfectants. 相似文献
147.
The speciation of titrated copper in a dissolved tannic acid (TA) solution with an initial concentration of 4 mmol organic carbon (OC)/l was investigated in a nine-step titration experiment (Cu/OC molar ratio = 0.0030–0.0567). We differentiated between soluble and insoluble Cu species by 0.45 μm filtration. Measurements with a copper ion selective electrode (ISE) and diffusive gradients in thin films (DGT) were conducted to quantify unbound Cu(II) cations (‘free’ Cu) and labile soluble Cu complexes. For the DGT measurements, we used an APA hydrogel and a Chelex 100 chelating resin (Na form). Insoluble organic Cu complexes (>0.45 μm) was the dominant Cu species for Cu/OC = 0.0030–0.0567 with a maximum fraction of 0.96 of total Cu. At Cu/OC > 0.0100, Cu-catalysed degradation of aggregate structures resulted in a strong increase of free Cu and (labile) soluble Cu complexes with a maximum fraction of 0.28 and 0.32 of total Cu, respectively. Labile (i.e. DGT-detectable) soluble Cu complexes had a relatively high averaged diffusion coefficient (D) in the APA hydrogel (3.50 × 10−6– 5.58 × 10−6 cm2 s−1). 相似文献
148.
针对我国采用高临界流动水分的磷矿进行湿法生产普钙普遍存在产品水分达不到部颁标准的难题,直接采用制浆废液(利用其主要对环境有害成分之一--MNA作减水剂)进行降低普钙水分的研究和应用.实验结果表明,添加少量的减水剂MNA可显著降低国内朝阳、昆阳、浏阳和国外摩洛哥等单种磷矿以及昆阳-朝阳混矿的矿浆粘度和水分.采用国产昆阳-朝阳混矿进行工业生产试验结果表明,添加0.35%~0.4%干矿粉重量的减水剂MNA,不仅可使球磨添加水量从145 kg降至103 kg,矿浆含水量从30.5%降至27%,成品肥含水量从16.24%降至13.77%,而且可使有效磷从10.67%升至12.24%,转化率由86.57%提高到90.45%,矿浆细度由90.18%提高到93.12%.实验和工业生产试验表明,直接用造纸制浆废液降低普钙水分,既确保和改善了普钙的产品质量,又治理了环境污染,取得了较好的经济、环境和社会效益. 相似文献
149.
采用统计学及质量控制的一些基本理论及方法对污水处理厂的运行数据进行分析,得出城市污水处理厂BOD5、COD、SS、TN、TP等主要出水指标呈正态分布的规律;城市污水BOD5、COD、TN、TP等指标间存在显著线性相关性的结论.研究结论可用于污水处理厂制定经济合理的出水监测方案以及对污水处理厂运行可靠性等进行评估. 相似文献
150.