全文获取类型
收费全文 | 8253篇 |
免费 | 65篇 |
国内免费 | 43篇 |
专业分类
安全科学 | 183篇 |
废物处理 | 430篇 |
环保管理 | 638篇 |
综合类 | 1196篇 |
基础理论 | 1967篇 |
环境理论 | 9篇 |
污染及防治 | 2698篇 |
评价与监测 | 701篇 |
社会与环境 | 512篇 |
灾害及防治 | 27篇 |
出版年
2023年 | 85篇 |
2022年 | 208篇 |
2021年 | 218篇 |
2020年 | 111篇 |
2019年 | 125篇 |
2018年 | 259篇 |
2017年 | 286篇 |
2016年 | 392篇 |
2015年 | 273篇 |
2014年 | 428篇 |
2013年 | 709篇 |
2012年 | 470篇 |
2011年 | 572篇 |
2010年 | 377篇 |
2009年 | 333篇 |
2008年 | 498篇 |
2007年 | 486篇 |
2006年 | 391篇 |
2005年 | 314篇 |
2004年 | 256篇 |
2003年 | 223篇 |
2002年 | 199篇 |
2001年 | 143篇 |
2000年 | 86篇 |
1999年 | 76篇 |
1998年 | 40篇 |
1997年 | 38篇 |
1996年 | 31篇 |
1995年 | 56篇 |
1994年 | 47篇 |
1993年 | 21篇 |
1992年 | 35篇 |
1991年 | 30篇 |
1990年 | 33篇 |
1989年 | 23篇 |
1988年 | 22篇 |
1987年 | 14篇 |
1986年 | 27篇 |
1984年 | 13篇 |
1983年 | 16篇 |
1982年 | 22篇 |
1980年 | 14篇 |
1966年 | 19篇 |
1965年 | 15篇 |
1964年 | 18篇 |
1963年 | 13篇 |
1960年 | 13篇 |
1958年 | 22篇 |
1957年 | 13篇 |
1956年 | 16篇 |
排序方式: 共有8361条查询结果,搜索用时 328 毫秒
141.
Laurent Paris Christophe Catala Olivier Iddir Nicolas Salaün 《Journal of Loss Prevention in the Process Industries》2010,23(5):561-573
High pressure tubular reactors for the production of Low Density Polyethylene (LDPE) are, for safety reasons, enclosed in a protective bay open towards the sky. They are becoming longer and larger due to production capacity increases. TECHNIP has historically designed these reactor bays based on Licensor information, which include more or less empirical correlations. Further capacity developments require the design of these concrete enclosures to be challenged. With this in mind, the present study shows the interest of implementing an innovative methodology based upon a risk-based approach to define new design criteria for the enclosure walls. The method, which combines both risk analysis with computational fluid dynamics modelling (3D CFD) and non-linear finite element analysis (NLFEA) tools, allows a clear determination of the design overpressure loads applied on walls and offers an optimisation of the concrete wall thickness. The CFD study also leads to a better understanding of the ventilation and efficiency of safety systems (gas detection, depressurisation) with possibility for improvement of the hazardous area classification rating. 相似文献
142.
Jesús M. Avilés Deseada Parejo Tomás Pérez-Contreras Carlos Navarro Juan J. Soler 《Die Naturwissenschaften》2010,97(2):181-186
A considerable number of bird species carry feathers to their nests. Feathers’ presence in the nests has traditionally been
explained by their insulating properties. Recently, however, it has been suggested that feathers carried to the nests by females
of the spotted starling (Sturnus unicolor L.) could have an ornamental function based on their ultraviolet (300–400 nm) and human-visible longer wavelength (400–700 nm)
coloration. In our population, 95.7% of feathers found inside next-boxes occupied by nesting starlings were rock dove fly
feathers. Of these feathers, 82.7% were naturally positioned with their reverse side oriented toward the entrance hole and
42.4% of all found feathers were situated within the nest-cup. Here we experimentally assess the signaling function of ultraviolet
coloration of feathers in nests of spotless starlings by providing nests with a number of pigeon flight feathers that were
respectively treated on their obverse, reverse, both, or neither side with a UV blocker. Starlings placed 42.5% of the experimental
feathers in the nest-cup irrespective of the UV block treatment. Orientation of feathers toward the entrance hole was not
related with their ultraviolet radiation. However, feathers placed within the nest-cup were more likely found with their reverse
side oriented toward the entrance hole confirming our correlative findings. These results suggest a minor role of ultraviolet
coloration on feather location by spotless starlings. 相似文献
143.
144.
de la Flor María Patricia Camarillo Rafael Martínez Fabiola Jiménez Carlos Quiles Rafael Rincón Jesusa 《Environmental science and pollution research international》2021,28(19):23720-23730
Environmental Science and Pollution Research - For the photocatalytic degradation of antioxidant 2,6-di-tert-butyl-hydroxytoluene (BHT), several TiO2-based composites have been prepared in MWCNT... 相似文献
145.
Gómez-Tolosa María Rivera-Velázquez Gustavo Rioja-Paradela Tamara M. Mendoza-Cuenca Luis F. Tejeda-Cruz César López Sergio 《Environmental science and pollution research international》2021,28(2):1381-1396
Environmental Science and Pollution Research - The order Odonata has been regularly used as an indicator of the ecosystem’s condition. The objective of this review was to analyze the... 相似文献
146.
Aliste Marina Garrido Isabel Pérez-Lucas Gabriel Flores Pilar Hellín Pilar Navarro Simón Fenoll José 《Environmental science and pollution research international》2021,28(19):23849-23858
Environmental Science and Pollution Research - In this study, the photocatalytic degradation of four fungicides, myclobutanil, penconazole and difenoconazole (triazole compounds) and boscalid... 相似文献
147.
Macías-Vargas José-Alberto Campos-Mañas Marina Celia Agüera Ana Sánchez Pérez José Antonio Ramírez-Zamora Rosa-María 《Environmental science and pollution research international》2021,28(19):24008-24022
Environmental Science and Pollution Research - In this work, the activated persulfate oxidation of ciprofloxacin (CIP) using a low-grade titanium ore under sunlight or simulated sunlight were... 相似文献
148.
Moles Samuel Berges Javier Ormad María P. Nieto-Monge M. Jesús Gómez Jairo Mosteo Rosa 《Environmental science and pollution research international》2021,28(19):24167-24179
Environmental Science and Pollution Research - The process TiO2/PAC/UV-vis has been under study and compared with the isolated treatments of adsorption and photocatalysis determining possible... 相似文献
149.
Ortiz-Ulloa Juvenal Alejandro Abril-González Mónica Fernanda Pelaez-Samaniego Manuel Raúl Zalamea-Piedra Teresa Silvana 《Environmental science and pollution research international》2021,28(15):18741-18753
Environmental Science and Pollution Research - Banana is one of the most important agricultural products of Ecuador. It relies on intensive monoculture cropping systems with a large volume of... 相似文献
150.
Novack Aline M. dos Reis Glaydson S. Hackbarth Fabíola V. Marinho Belisa A. Ðolić Maja B. Valle José A. B. Sampaio Carlos H. Lima Eder C. Dotto Guillherme L. Ulson de Souza Antônio Augusto Vilar Vítor J. P. Guelli Ulson de Souza Selene M. A. 《Environmental science and pollution research international》2021,28(19):23568-23581
Environmental Science and Pollution Research - This paper presents the synthesis of a hybrid material through the use of natural pozzolan and titanium(IV) isopropoxide using the sol-gel method and... 相似文献