全文获取类型
收费全文 | 450篇 |
免费 | 20篇 |
国内免费 | 95篇 |
专业分类
安全科学 | 28篇 |
废物处理 | 31篇 |
环保管理 | 32篇 |
综合类 | 139篇 |
基础理论 | 78篇 |
污染及防治 | 199篇 |
评价与监测 | 27篇 |
社会与环境 | 23篇 |
灾害及防治 | 8篇 |
出版年
2024年 | 1篇 |
2023年 | 7篇 |
2022年 | 21篇 |
2021年 | 16篇 |
2020年 | 17篇 |
2019年 | 7篇 |
2018年 | 10篇 |
2017年 | 9篇 |
2016年 | 13篇 |
2015年 | 12篇 |
2014年 | 27篇 |
2013年 | 54篇 |
2012年 | 38篇 |
2011年 | 39篇 |
2010年 | 13篇 |
2009年 | 25篇 |
2008年 | 25篇 |
2007年 | 50篇 |
2006年 | 21篇 |
2005年 | 19篇 |
2004年 | 13篇 |
2003年 | 31篇 |
2002年 | 13篇 |
2001年 | 18篇 |
2000年 | 12篇 |
1999年 | 4篇 |
1998年 | 3篇 |
1997年 | 6篇 |
1996年 | 4篇 |
1995年 | 4篇 |
1994年 | 4篇 |
1993年 | 3篇 |
1992年 | 2篇 |
1991年 | 2篇 |
1990年 | 2篇 |
1989年 | 2篇 |
1988年 | 1篇 |
1987年 | 5篇 |
1986年 | 2篇 |
1984年 | 2篇 |
1983年 | 1篇 |
1979年 | 4篇 |
1978年 | 1篇 |
1976年 | 1篇 |
1975年 | 1篇 |
排序方式: 共有565条查询结果,搜索用时 109 毫秒
531.
为研究全氟辛烷磺酸盐(PFOS)暴露对胎鼠肺部损伤的诱导作用,孕期SD大鼠在5~20mg·kg-1剂量范围内的PFOS中处理7d,取胎鼠全肺并分析其发育所受的影响。通过形态学比较,发现随着PFOS浓度的增加,胎鼠体长和体重均显著降低,高剂量暴露会导致胎鼠死亡。通过组织学检测,发现胎鼠肺的发育受到PFOS暴露的抑制。通过WesternBlot检测肺泡Ⅰ/Ⅱ型细胞的发育,发现肺泡Ⅰ型细胞特异蛋白Podoplanin表达显著减少(p<0.05),肺泡Ⅱ型细胞特异蛋白SP-C表达减少但未出现显著差异,此外,与对照组相比高剂量暴露会引起血管内皮生长因子(VEGF)表达显著减少(p<0.01)。实验结果说明,PFOS暴露会导致胎鼠肺部发育出现损伤,这种损伤可能是肺泡Ⅰ型细胞及肺部血管发育受抑制引起胎鼠肺部气体交换功能破坏。 相似文献
532.
533.
红霉素是一种常用的大环内酯类抗生素,其对多刺裸腹溞连续世代生活史参数的影响尚不得而知。本文以连续3个世代的多刺裸腹溞为对象,研究了不同浓度(0.02、0.2、2、20、200和2 000μg·L~(-1))的红霉素对其平均寿命、首次生殖年龄、生殖窝数、窝卵数和总后代数等的影响。结果表明,红霉素浓度对多刺裸腹溞的平均寿命、首次生殖年龄、生殖窝数、窝卵数和总后代数的影响在多刺裸腹溞世代间均存在着明显的差异。与空白对照组相比,红霉素浓度对多刺裸腹溞F0代平均寿命的影响表现出"低(0.02μg·L~(-1))促高(2~2 000μg·L~(-1))抑"的剂量-效应关系,暴露于20μg·L~(-1)红霉素溶液中的多刺裸腹溞F0代的生殖窝数显著减小了55.76%,但暴露于各浓度红霉素溶液中的多刺裸腹溞F1和F2代的平均寿命和生殖窝数均未出现显著性差异;暴露于各浓度红霉素溶液中的多刺裸腹溞F0代的首次生殖年龄也未出现显著性差异,但暴露于0.2、20~2 000μg·L~(-1)红霉素溶液中的F1代的首次生殖年龄显著减小了4.90%~15.69%,暴露于0.2~2 000μg·L~(-1)红霉素溶液中的F2代的首次生殖年龄显著减小了5.00%~16.00%;暴露于20和200μg·L~(-1)红霉素溶液中的多刺裸腹溞F1代的窝卵数分别显著增加了28.87%和10.18%,但暴露于各浓度红霉素溶液中的F0和F2代的窝卵数未出现显著性差异;暴露于2~200μg·L~(-1)的红霉素溶液中的多刺裸腹溞F0代的总后代数显著减少了43.99%~62.21%,而暴露于20和200μg·L~(-1)红霉素溶液中的F1代的总后代数分别增加28.56%和37.17%,红霉素浓度对多刺裸腹溞总后代数的显著性影响在F2代中消失。本研究结果表明,多刺裸腹溞对不同剂量红霉素多代暴露表现出适应性或耐受性。 相似文献
534.
535.
北固山湿地土壤氮磷的空间分布特征 总被引:3,自引:0,他引:3
镇江北固山湿地是一以芦苇(Phragmites australis)和虉草(Phalaris arundinacea L.)为优势植物的滨江湿地,土壤中氮磷空间分布对了解湿地水体的富营养化具有重要意义.在北固山湿地的典型区域内布点采样,对土壤中氮磷进行分析,研究了湿地土壤氮磷水平变异性及氮磷在不同植被区土壤中的空间分布规律.结果表明:北固山湿地全氮主要分布在0~60 cm土壤层,表层土壤中全磷质量分数显著高于下层土壤.土壤各层次全磷的水平变异性普遍高于全氮,尤其在20~40 cm土壤层全磷的变异系数达到52.34%,说明氮素在各层次分布相对均匀.植被类型对土壤中氮磷的空间分布有较大影响,虉草区各土壤层全氮、全磷质量分数均高于芦苇区,其0~20 cm和20~40 cm土壤层全磷质量分数亦高于空地.受污水排放、内江水冲洗等作用,污染空地及三个排污口全氮、全磷质量分数分别呈现不同的空间变化规律.研究结果为湿地生态恢复和生态清淤提供参考. 相似文献
536.
537.
Environmental catalysis also can refer to catalytic technologies for reducing emission of environmentally unacceptable compounds. Catalytic decomposition also is one of the cost-effective technologies to solve the troublesome volatile organic compounds. This study treated methyl isobutyl ketone (MIBK) by a commercial catalyst, Pt/gamma-Al(2)O(3), in an isothermal fixed bed differential reactor. The effects of O(2) and MIBK content in carrier gas on the catalysis's reaction rate are also observed. Three kinetic models, i.e. the Mars and van Krevelen model, Langmuir-Hinshelwood model and power-rate law were applied to best fit the experimental results. The results indicate that the kinetic behavior of MIBK oxidation with catalysis can be accounted for by using the rate expression of the Mars and van Krevelen model and Langmuir-Hinshelwood model. Kinetic parameters are also determined on the basis of the differential reactor data. The experimental results are compared with those of the model predicted. 相似文献
538.
Morphological changes in flocs were elucidated by small-angle light scattering, free settling tests and microscopic observation to determine the effects of pre-hydrolysis (alkaline treatment and ultrasonication) on two sludges--primary raw sludge from the Malabar Sewage Treatment Plant, Sydney (sludge M) and biological sludge collected at the nitrogen removal unit of St Marys Sewage Treatment Plant in Sydney (sludge S). Ultrasonication or alkaline treatment released a marked amount of insoluble organic matter in a soluble form. The latter treatment was more efficient than the former. Meanwhile, the pre-hydrolyzed flocs had more compact structures than the original ones, as shown by their higher free-settling fractal dimension, lower areal porosity and smaller internal pores. In particular, alkaline treatment yielded flocs with more compact interiors than did ultrasonication. Such detailed structural information could not be elicited by monitoring the change in floc size. The greater resistance to mass transfer of the hydrolyzed flocs thus produced does not reduce the efficiency of subsequent digestion, indicating that the surface reaction rate on the solid surface might have dominated since the pre-hydrolysis steps modified the local chemical environment to promote digestion. 相似文献
539.
Grease traps are widely used by most restaurants and food processing industries in Hong Kong to reduce oil and grease to an acceptable level before it can be discharged to public sewers. To meet demanding effluent standards in the future, it is necessary to polish the effluent by upgrading the conventional trap design. This study evaluated the possibility of upgrading traditional grease traps by installing tube settlers inside the trap. Their efficiency of removing chemical oxygen demand (COD) and oil/grease was examined to justify the performance. It was found that installing a tube settler is a feasible and cheap way to upgrade the conventional grease trap, since it improved oil/grease removal efficiency by 8-10% compared to the conventional design. In addition, a remarkable improvement in COD removal was observed following a very short hydraulic detention time after the installation of tube settlers. This ensured acceptable effluent quality under peak flowrates. Two mathematical models were also proposed to facilitate trap design. 相似文献
540.
Xiaona Chu Jiangyong Hu Say Leong Ong 《Frontiers of Environmental Science & Engineering in China》2009,3(4):393-403
Proteomics involves the separation of proteins, identification of the amino acid sequence of the interested or target proteins,
study of the function of the proteins, modification, structure and ultimate assignments to functional pathways in the cell.
The proteomic investigations have contributed greatly to human diseases studies, new drugs discovery researches, and environmental
science in recent years. This article provides a review on the development of the main proteomic technologies, including both
the gel based and non-gel based technologies, and their applications in environmental science. Proteomic technologies have
been utilized in the environmental stresses studies to analyze the induction or reduction of proteins at expression level
and identify the target proteins to investigate their function in response to environmental stresses, such as high or low
pH, oxidation stress, and toxic chemicals. Such protein responses are also helpful to understand the mechanisms of some cellular
activities and the functions of some proteins. 相似文献