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861.
862.
UASB+A/O+UF+NF工艺处理生活垃圾焚烧厂渗滤液 总被引:2,自引:0,他引:2
采用"UASB+A/O+UF+NF"工艺处理生活垃圾焚烧厂渗滤液,工程规模为150 m3/d,工程总投资500万元,运行成本为25元/t;污泥处理工艺过程为:(剩余污泥+厌氧污泥)浓缩→脱水→焚烧。工程设计进水水质指标为ρ(COD)=50000 mg/L,ρ(BOD5)=25 000 mg/L,ρ(NH3-N)=600 mg/L,ρ(TP)=15 mg/L,ρ(SS)=9000 mg/L,出水主要水质指标为ρ(COD)≤50 mg/L,ρ(BOD5)≤15 mg/L,ρ(NH3-N)≤10 mg/L,ρ(TP)≤0.27 mg/L,ρ(SS)≤4 mg/L,补充到电厂循环冷却水中回用,不但实现了垃圾焚烧污水零排放,还有着较好的经济和环境效益。 相似文献
863.
含砷废物资源化产品中砷的浸出特性与环境风险分析 总被引:2,自引:0,他引:2
分别以我国某地2种含砷废物(污泥和废渣)为研究对象,用EA NEN 7371实验方法分析其不同资源化产品(烧制砖、免烧砖和含砷水泥等)中As的有效量浸出特性,从环境风险的角度探讨了含砷废物资源化利用的可行性. 结果显示:含砷污泥进行烧砖处置后,其产品中As的有效量浸出率从15%左右升至60%~70%;含砷废渣与水泥进行混合粉磨共处置后,含砷水泥产品中As的有效量浸出率从60%~70%降至4%以下;含砷废渣制成免烧砖后,As的有效量浸出率从60%~70%降至10%左右. 表明含砷污泥不宜进行烧砖处置;而含砷废渣可根据含砷量,在控制掺加比例的条件下与水泥熟料共处置生产混合水泥或作为原材料生产免烧砖. 相似文献
864.
Nicole B. Richoux Sébastien Jaquemet Bo T. Bonnevie Yves Cherel Christopher D. McQuaid 《Marine Biology》2010,157(8):1755-1766
During chick-rearing, albatrosses can alternate between long foraging trips that provide the main source of food for the adults
and short foraging trips that they use to feed their young. This flexibility in foraging behaviour can lead to differences
in diet composition between adults and chicks and implies that they may be vulnerable in different ways to food shortages.
The trophic ecology of the Grey-headed albatross Thalassarche chrysostoma was investigated at the sub-Antarctic Prince Edward Islands during the chick-rearing period in April 2006 using a combination
of approaches. Diets of adults and chicks were assessed using stable isotope ratios and fatty acid (FA) profiles of blood
and/or stomach oils, in addition to stomach contents analysis. Fish from the family Macrouridae and cephalopods (particularly
the onychoteuthid Kondakovia longimana) were the primary prey, whereas crustaceans (krill Euphausia superba) represented a smaller proportion of the stomach contents. Stomach oil FA profiles contained more monounsaturated FA than
the profiles of plasma, which were richer in saturated FA and arachidonic acid (20:4n-6). There was also a distinct separation
of adults from chicks, with higher levels of monounsaturates in chick plasma, and higher saturated FA levels (particularly
16:0) in the adult plasma. Stable carbon isotope ratios of whole blood were similar in adults and chicks, whereas stable nitrogen
isotope ratios showed significant enrichment by >1‰ in chicks. The combined FA, stable isotopes and stomach contents analyses
suggest clear differences in diet quality between adults and chicks, with chicks feeding at a higher trophic position through
feeding more on highly nutritious fish and adults keeping much of the less nutritious zooplankton for themselves. 相似文献
865.
In this paper, we propose a semiparametric survival model to investigate the pattern of spatial and temporal variation in
disease prevalence of chronic wasting disease (CWD) in wild deer in Wisconsin over the years 2002 and 2006. The semiparametric
survival model we suggested allows to build a more flexible model than the parametric model with fewer parametric assumptions
by modeling the baseline hazard using a Gamma process prior. Based on the proposed model, we investigate the geographical
distribution of CWD, and assess the effect of sex on disease prevalence. We use a Bayesian hierarchical framework where latent
parameters capture temporal and spatial trends in disease incidence, incorporating sex and spatially correlated random effects.
We also propose bivariate baseline hazard which change over age and time simultaneously to adopt different effects of age
and time on the baseline hazard. Inference is carried out by using MCMC simulation techniques in a fully Bayesian framework.
Our results suggest that disease has been spreaded mainly in the disease eradication zone and male deer show a significantly
higher infection probability than female deer. 相似文献
866.
了解不同油类对虾蟹类幼体的急性毒性效应。曝油处理采用磁力搅拌器搅拌,一定时间的超声波乳化等操作,模拟溢油在海洋中风浪、涡动、湍流的乳化过程;设置阶梯浓度组,并在多个平行组急性试验的基础上,估算出8种油品对2种虾类和2种蟹类的半致死质量浓度LC50和安全质量浓度MPC,并运用程序编制溢油质量浓度与虾蟹类死亡率相关性的估算模型。经过分析,结果得到:各MPC值参差不齐,差距较大;燃料油普遍比原油的毒性效应大;相同生长阶段,蟹类比虾类抗油毒害性强、中国明对虾Fenneropenaeuschinensis比日本囊对虾Marsupenaeusjaponicus抗油毒害性强、锯缘青蟹Scyllaserrata比三疣梭子蟹Portunustrituberculatu抗油毒害性强。编制的溢油质量浓度与死亡率相关性的评估模型,简易方便直观,为渔业污染事故理赔提供了一定的参考价值,亦为海域的生态经济学评估提供了一种新的研究方法。 相似文献
867.
Shuting ZHANG Bo WEI Xin YU Bing LIU Zhuoying WU Li GU 《Frontiers of Environmental Science & Engineering》2010,4(4):459-465
The biologic activated carbon (BAC) process is widely used in drinking water treatments. A comprehensive molecular analysis of the microbial community structure provides very helpful data to improve the reactor performance. However, the bottleneck of deoxyribonucleic acid (DNA) extraction from BAC attached biofilm has to be solved since the conventional procedure was unsuccessful due to firm biomass attachment and adsorption capacity of the BAC granules. In this study, five pretreatments were compared, and adding skim milk followed by ultrasonic vibration was proven to be the optimal choice. This protocol was further tested using the vertical BAC samples from the full-scale biofilter of Pinghu Water Plant. The results showed the DNA yielded a range of 40 μg·g-1 BAC (dry weight) to over 100 μg·g-1 BAC (dry weight), which were consistent with the biomass distribution. All results suggested that the final protocol could produce qualified genomic DNA as a template from the BAC filter for downstream molecular biology researches. 相似文献
868.
Węgrzyn Magdalena Rudnik Ewa Kamocka-Bronisz Renata Kukfisz Bożena 《Journal of Polymers and the Environment》2021,29(6):1808-1816
Journal of Polymers and the Environment - Biocomposites based on polyethylene from renewable resources derived from sugar cane as raw material were modified with phosphonium ionic liquids.... 相似文献
869.
870.