全文获取类型
收费全文 | 2525篇 |
免费 | 76篇 |
国内免费 | 920篇 |
专业分类
安全科学 | 186篇 |
废物处理 | 145篇 |
环保管理 | 203篇 |
综合类 | 1252篇 |
基础理论 | 437篇 |
污染及防治 | 956篇 |
评价与监测 | 123篇 |
社会与环境 | 94篇 |
灾害及防治 | 125篇 |
出版年
2024年 | 1篇 |
2023年 | 43篇 |
2022年 | 119篇 |
2021年 | 92篇 |
2020年 | 76篇 |
2019年 | 89篇 |
2018年 | 80篇 |
2017年 | 108篇 |
2016年 | 133篇 |
2015年 | 170篇 |
2014年 | 219篇 |
2013年 | 265篇 |
2012年 | 196篇 |
2011年 | 210篇 |
2010年 | 192篇 |
2009年 | 167篇 |
2008年 | 164篇 |
2007年 | 127篇 |
2006年 | 147篇 |
2005年 | 102篇 |
2004年 | 89篇 |
2003年 | 78篇 |
2002年 | 85篇 |
2001年 | 112篇 |
2000年 | 74篇 |
1999年 | 70篇 |
1998年 | 72篇 |
1997年 | 53篇 |
1996年 | 39篇 |
1995年 | 36篇 |
1994年 | 30篇 |
1993年 | 21篇 |
1992年 | 18篇 |
1991年 | 7篇 |
1990年 | 14篇 |
1989年 | 3篇 |
1988年 | 5篇 |
1987年 | 4篇 |
1986年 | 4篇 |
1985年 | 2篇 |
1984年 | 2篇 |
1983年 | 2篇 |
1982年 | 1篇 |
排序方式: 共有3521条查询结果,搜索用时 62 毫秒
911.
全球气候变化的研究与进展 总被引:14,自引:2,他引:12
论述了全球气候变化的研究目标、方法、主要科学问题及近10年来国内外的研究进展和存在的主要问题。指出中国是全球的一个组成部分,又是人类活动最为强烈的地区之一,在全球气候变化、特别是人类活动诱发的气候变化的研究中占有十分重要的地位。建议大力加强全球气候变化的研究,增加研究经费的投入,积极参与国际科学合作,把当前较为分散的研究有效地组织到一些有前景的、能出高水平成果的课题上去,为全球气候变化研究做更大的贡献。 相似文献
912.
Koudenoukpo Zinsou Cosme Odountan Olaniran Hamed Guo Chuanbo Céréghino Regis Chikou Antoine Park Young-Seuk 《Environmental science and pollution research international》2023,30(5):11893-11912
Environmental Science and Pollution Research - Rivers are dynamic systems in complex interactions with their surrounding environments. Reliable and fast interpretation of water quality is therefore... 相似文献
913.
Wang Xianmin Guo Haonan Ding Ziyang Wang Lizhe 《Environmental science and pollution research international》2023,30(2):3088-3111
Environmental Science and Pollution Research - More than 70% of catastrophic landslides were previously unknown and brought tremendous losses to human life and property in urban regions; therefore,... 相似文献
914.
915.
Human PCDD/PCDF levels near a pentachlorophenol contamination site in Tainan, Taiwan 总被引:1,自引:0,他引:1
A pentachlorophenol (PCP) manufacturing plant in southern Taiwan discontinued production in 1989. The site of the abandoned plant was heavily contaminated by PCDD/PCDFs, impurities formed in the PCP production process. Serum samples collected from 27 residents living near the deserted plant were evaluated to determine whether this contamination had associated serum levels of PCDD/PCDFs in local residents. The average level of 17 tested congeners ranged from 556 to 5240 pg/g lipid (mean, 1670 pg/g lipid). The corresponding 2,3,7,8-TCDD toxicity equivalent quotient values calculated by international toxicity equivalent factors (I-TEFs) and those recommended by WHO (WHO-TEFs) were 47.2 pg I-TEQ/g lipid and 53.4 pg WHO-TEQ/g lipid, respectively. Levels in other parts of Taiwan typically range from 15 to 20 pg WHO-TEQ/g lipid; therefore, it is likely that the heavily contaminated plant site caused these unusually high serum levels. The average PCDD/PCDF levels of 29 fish-tissue and nine soil samples collected from the sea reservoir surrounding the abandoned PCP plant were also abnormally high: 8630 pg/g lipid (985 pg WHO-TEQ/g lipid) and 606000 pg/g-sample (922 pg WHO-TEQ/g-sample), respectively. Factor analysis indicated that the congener pattern of human serum samples collected from residents living near the abandoned PCP plant different from samples collected from other areas in Taiwan without known PCDD/PCDF pollution. Similar results were observed for the fish tissue and soil samples. The current study may have discovered a "hot spot" for elevated dioxin human exposure in Taiwan. The preliminary finding has raised a public health concern in the inspected area and requires further investigations to clarify the nature of the contamination and potential impact on the local environment and human health. 相似文献
916.
Qu Wei He Deliang Guo Yanni Tang Yining Song Ren-Jie 《Environmental science and pollution research international》2019,26(21):21189-21200
Environmental Science and Pollution Research - By a simple and convenient method of using epichlorohydrin as linkages, a novel Alternanthera philoxeroides (AP) derivative modified with... 相似文献
917.
选择长江源区的格尔木市唐古拉山镇作为研究区,通过野外实地采样与室内测试分析相结合,在分析草地植被不同退化阶段和不同土层深度下土壤持水能力特征的基础上,探讨了草地植被退化对土壤持水能力影响。结果表明:(1)在相同草地植被退化阶段,毛管持水量、饱和含水量和田间持水量随土层深度变化的特征基本一致;在相同土层深度上,毛管持水量、饱和含水量和田间持水量随草地植被退化的特征也大体相同。(2)在相同草地植被退化阶段,土壤持水量总体上随土层深度增加而减少,特别是在未退化阶段,10~20 cm土层的毛管持水量、饱和含水量和田间持水量比0~10 cm土层分别减少了12.38%、33.73%和7.64%。(3)在相同土层深度上,土壤持水量总体上随草地植被退化而减少,特别是在0~10 cm土层,轻度退化阶段的毛管持水量、饱和含水量和田间持水量比未退化阶段分别减少了41.52%、59.95%和27.03%。(4)土壤持水量与土壤容重、总碳、有机质和总氮显著相关,它在草地植被不同退化阶段和不同土层深度下的变化可能与地表覆被状况、植物根系数量和分布特征所引起的土壤容重、有机质等变化有关。研究可深化对草地植被退化与土壤持水能力相互关系的理解和认识,并为长江源区生态环境和水资源状况研究提供参考依据。
关键词: 土壤持水能力;草地植被退化;长江源区;影响 相似文献
918.
Han Xuesong Huettmann Falk Guo Yumin Mi Chunrong Wen Lijia 《Regional Environmental Change》2018,18(7):2173-2182
Regional Environmental Change - Ongoing global climate change greatly alters the distribution of species, and such impacts are even amplified on the Tibetan Plateau. The black-necked crane (Grus... 相似文献
919.
This study investigated particle size and density distributions of polycyclic aromatic hydrocarbons (PAHs) in two surface sediments (JZ and KF), collected from the Yellow River of Henan section, China. The concentrations of Σ15PAHs ranged from 35.6 to 45862?ng g?1 dry wt, which were greatly elevated in coarse particles and low-density fractions. The Σ15PAHs concentrations in low-density fractions were 533 (JZ) and 996 (KF) times higher than those in the corresponding high-density fractions. However, due to relatively less quantities of low-density fractions (0.27–2.33%), most of the PAHs were contributed by the high-density components. For both sediments, the influence factors of PAHs source in the environment were very complex, more so than the level of TOC and BC content. JZ sediment was dominated by 4-ring to 6-ring PAHs (61.5–75.1%), while, 2-ring to 3-ring PAHs were abundant in KF samples (39.8–72.6%). Ratios of specific PAHs reflected PAHs among the size- and density-fraction of each sediment may be contaminated by mixed of pyrolytic and petrogenic origin. Additionally, ecological risk assessment of PAHs suggested that total toxic equivalent values of PAHs in the low-density fractions were much higher than those of the corresponding high-density fractions in the studied area. 相似文献
920.
针对某企业焦炉烟气,新建一套脱硫脱硝除尘装置,焦炉烟气经过处理后,烟气中颗粒物、二氧化硫、氮氧化物以排放浓度满足《炼焦化学工业污染物排放标准》(GB16171-2012)大气污染物排放限值的要求。即:SO2排放浓度小于50mg/Nm^3,NOx排放浓度小于500mg/Nm^3,同时要求处理后烟气中颗粒物排放浓度小于30mg/Nm^3,氨含量排放浓度小于8ppm。 相似文献