全文获取类型
收费全文 | 5699篇 |
免费 | 498篇 |
国内免费 | 1959篇 |
专业分类
安全科学 | 494篇 |
废物处理 | 297篇 |
环保管理 | 538篇 |
综合类 | 3454篇 |
基础理论 | 956篇 |
污染及防治 | 1649篇 |
评价与监测 | 348篇 |
社会与环境 | 238篇 |
灾害及防治 | 182篇 |
出版年
2024年 | 25篇 |
2023年 | 143篇 |
2022年 | 307篇 |
2021年 | 300篇 |
2020年 | 282篇 |
2019年 | 217篇 |
2018年 | 255篇 |
2017年 | 295篇 |
2016年 | 265篇 |
2015年 | 292篇 |
2014年 | 435篇 |
2013年 | 609篇 |
2012年 | 488篇 |
2011年 | 521篇 |
2010年 | 425篇 |
2009年 | 412篇 |
2008年 | 401篇 |
2007年 | 357篇 |
2006年 | 325篇 |
2005年 | 247篇 |
2004年 | 163篇 |
2003年 | 194篇 |
2002年 | 155篇 |
2001年 | 137篇 |
2000年 | 146篇 |
1999年 | 122篇 |
1998年 | 117篇 |
1997年 | 89篇 |
1996年 | 98篇 |
1995年 | 77篇 |
1994年 | 52篇 |
1993年 | 41篇 |
1992年 | 53篇 |
1991年 | 16篇 |
1990年 | 25篇 |
1989年 | 13篇 |
1988年 | 5篇 |
1987年 | 6篇 |
1986年 | 7篇 |
1985年 | 8篇 |
1984年 | 4篇 |
1983年 | 4篇 |
1982年 | 2篇 |
1981年 | 4篇 |
1979年 | 2篇 |
1974年 | 2篇 |
1973年 | 7篇 |
1972年 | 2篇 |
1971年 | 1篇 |
1969年 | 1篇 |
排序方式: 共有8156条查询结果,搜索用时 765 毫秒
671.
ABSTRACT. A multiple-outfall system for cooling water disposal which is distributed along the direction of stream flow is analyzed. The results provide a simple method of preliminary design of a cooling water discharge outfall system and for a quick extimate of water quality of a polluted stream. It is shown that a properly designed distributed discharge system is capable of preventing serious pollution due to localized discharge of wastes and waste heat; however, the final design of the discharge system should take into account alternative schemes of waste heat disposal and their economic consequences. 相似文献
672.
S. H. Lin L. T. Fan C. L. Hwang 《Journal of the American Water Resources Association》1973,9(4):689-702
A modified transient version of the Streeter-Phelps model along with the energy balance equation is employed to analyze the effects of waste heat discharge from power plants on stream water quality. Analysis is also made to examine the effects of the upstream water quality and stream velocity on the downstream DO concentration level. The resulting coupled nonlinear hyperbolic partial differential equations representing the energy, BOD and DO concentrations are solved by the method of characteristics and simulated on a digital computer. Final numerical results indicate that the allowable quantity of thermal discharge does heavily depend on the upstream quality. 相似文献
673.
S. H. Lin L. T. Fan C. L. Hwang 《Journal of the American Water Resources Association》1973,9(5):874-883
ABSTRACT: The purpose of this work is to study the installation of artificial aerators for water quality control of a stream which receives thermal and organic waste discharges. The location and numer of diffuser type aerators to be installed along the stream are determined so as to maintain the stream DO content above a certain minimum requirement (4 mg/l or 5 mg/l) for normal aquatic life. Effects of the stream velocity, upstream BOD concentration and rates of thermal and organic waste discharges to the stream are examined. 相似文献
674.
虚拟现实技术在安全工程中的应用 总被引:23,自引:2,他引:21
论述了虚拟现实技术(VirtualReality)的基本原理、应用范围。结合大空间公用建筑火灾虚拟现实系统,提出了安全工程中应用虚拟现实技术的基本结构及程序设计关键技术,给出了大空间公用建筑火灾虚拟现实系统编制实例 相似文献
675.
1 深入学习邓小平理论,努力维护林业改革与发展的安全环境和林区社会稳定 深入学习邓小平理论是当前重大而紧迫的任务。当前,林业各项改革正稳步推进,但改革不可能一帆风顺,已经出现了这样那样的问题,也还会出现其它的问题。要解决这些问题,就要求我们深入学习邓小平理论,坚持解放思想、实事求是的思想路线,从改革、发展、稳定的大局出发,做好各项工作。1.1 讲学习,用理论指导实践 “讲学习、讲政治、讲正气”是今年全党、全国的一项重要工作,是进一步深刻领会邓小平理论的重要举措。“讲学习”冠以“三讲”之首,说… 相似文献
676.
677.
The Mei-yu (plum rain) season is a short but important period when the weather changes from spring to summer in Taiwan. In this study, size-segregated aerosols were collected alternately at 5 sampling sites in northwestern Taiwan from June 16 to 24, 1994. For the first time in Taiwan, this study revealed the aerosol mass spectra and water-soluble ions in the Mei-yu season. For all samples, a bi-modal aerosol mass spectra was found with modal diameters at 3.2 and 0.32 microm, respectively. The aerosol samples were able to be divided into different groups to show their mass and ion spectra according to the calculated 5-hr backward air trajectory. The utilization of enrichment factors showed that aerosol Cl-, Na+, and Mg2+ for all sizes, and super-micron SO4(2-) were related to the sea. Both the scheme of "chlorine loss" (Ohta and Okita, 1990) and a multivariate analysis (Thurston and Spengler, 1985) for categorizing water-soluble ions showed that sea-salts were major contributors in the prevalence of a sea breeze. In contrast, the secondary salts were significant for land breeze and a mix of land-sea breeze. In conclusion, the influence of local circulation on the distribution of aerosol mass and ionic species was found to be prominent. 相似文献
678.
Xinyou Lin Guangji Zhang Shenshen Wei Yanli Yin 《International Journal of Green Energy》2020,17(8):488-500
ABSTRACT The drive range of electric vehicle (EV) is one of the major limitations that impedes its universalism. A great deal of research has been devoted to drive range improvement of EV, an accurate and efficiency energy consumption estimation plays a crucial role in these researches. However, the majority of EV’s energy consumption estimation models are based on single motor EV, these models are not suitable for dual-motor EVs, which are composed of more complex transmission mechanisms and multiple operating modes. Thus, an energy consumption estimation model for dual-motor EV is proposed to estimate battery power. This article focuses on studying the operating modes and system efficiency in each operating mode. The limitation of working area of each mode ensures the vehicle dynamic performance, then PSO algorithm is adopted to optimize the torque (speed) distribution between two motors to improve the system efficiency in the coupled driving mode. Finally, the energy consumption estimation model is established by multiple linear regression (MLR). The result shows that the proposed model has a high precision in energy consumption estimation of dual-motor EV. 相似文献
679.
680.
Chung YC Lin YY Tseng CP 《Journal of the Air & Waste Management Association (1995)》2004,54(4):450-458
Simultaneous removal of hydrogen sulfide (H2S) and ammonia (NH3) gases from gaseous streams was studied in a biofilter packed with granule activated carbon. Extensive studies, including the effects of carbon (C) source on the growth of inoculated microorganisms and gas removal efficiency, product analysis, bioaerosol emission, pressure drop, and cost evaluation, were conducted. The results indicated that molasses was a potential C source for inoculated cell growth that resulted in removal efficiencies of 99.5% for H2S and 99.2% for NH3. Microbial community observation by scanning electron microscopy indicated that granule activated carbon was an excellent support for microorganism attachment for long-term waste gas treatment. No disintegration or breakdown of biofilm was found when the system was operated for 140 days. The low bioaerosol concentration emitted from the biofilter showed that the system effectively avoided the environmental risk of bioaerosol emission. Also, the system is suitable to apply in the field because of its low pressure drop and treatment cost. Because NH3 gas was mainly converted to organic nitrogen, and H2S gas was converted to elemental sulfur, no acidification or alkalinity phenomena were found because of the metabolite products. Thus, the results of this study demonstrate that the biofilter is a feasible bioreactor in the removal of waste gases. 相似文献