全文获取类型
收费全文 | 1923篇 |
免费 | 256篇 |
国内免费 | 250篇 |
专业分类
安全科学 | 412篇 |
废物处理 | 215篇 |
环保管理 | 391篇 |
综合类 | 947篇 |
基础理论 | 94篇 |
环境理论 | 5篇 |
污染及防治 | 65篇 |
评价与监测 | 114篇 |
社会与环境 | 82篇 |
灾害及防治 | 104篇 |
出版年
2024年 | 3篇 |
2023年 | 23篇 |
2022年 | 66篇 |
2021年 | 68篇 |
2020年 | 100篇 |
2019年 | 83篇 |
2018年 | 68篇 |
2017年 | 94篇 |
2016年 | 115篇 |
2015年 | 119篇 |
2014年 | 127篇 |
2013年 | 131篇 |
2012年 | 182篇 |
2011年 | 181篇 |
2010年 | 154篇 |
2009年 | 111篇 |
2008年 | 85篇 |
2007年 | 115篇 |
2006年 | 103篇 |
2005年 | 84篇 |
2004年 | 58篇 |
2003年 | 74篇 |
2002年 | 38篇 |
2001年 | 37篇 |
2000年 | 32篇 |
1999年 | 37篇 |
1998年 | 26篇 |
1997年 | 17篇 |
1996年 | 8篇 |
1995年 | 10篇 |
1994年 | 10篇 |
1993年 | 6篇 |
1992年 | 7篇 |
1991年 | 9篇 |
1990年 | 2篇 |
1989年 | 4篇 |
1986年 | 2篇 |
1985年 | 3篇 |
1984年 | 3篇 |
1983年 | 6篇 |
1982年 | 2篇 |
1981年 | 3篇 |
1979年 | 4篇 |
1978年 | 3篇 |
1975年 | 1篇 |
1974年 | 1篇 |
1973年 | 3篇 |
1972年 | 1篇 |
1971年 | 4篇 |
1970年 | 2篇 |
排序方式: 共有2429条查询结果,搜索用时 470 毫秒
111.
拱形抗滑桩墙支护结构体系模型试验相似材料研制 总被引:1,自引:0,他引:1
根据模型试验相似比尺和桩土间应力协调要求,用机制砂、河砂、水泥、石粉等配置了40组(每组6个)低强度、低弹性模量的圆柱形微混凝土相似材料试件.测试结果表明:微混凝土具有和原型混凝土大致相同的应力应变阶段和破坏模式,可以模拟原型结构的力学行为和变形、破坏特征.砂率和石粉取代率不同时,微混凝土试件的轴压强度和弹性模量在较大... 相似文献
112.
风能资源开发利用的社会需要和发展前景 总被引:7,自引:0,他引:7
开发风能资源、利能风力发电在我国虽然只有数十年,但发展却很快。作为可再生的清洁能源越来越受到重视。不仅有巨大的环保意义,也有突出的经济效益。本文从风能利用的意义和社会需要展开论证,结合我国风能资源利用的概况,特别是结合风电装机最多的新疆的实际情况进行估算,从多侧面论述了风能资源的开发利用问题。 相似文献
113.
114.
《组织行为杂志》2017,38(7):1057-1075
Research to date has largely been unclear about whether a single perpetrator is sufficient to instigate the well‐documented negative consequences of workplace incivility. In the current research, we examine the extent to which perceived belongingness and embarrassment mediate the relationship between incivility from a single perpetrator and two important outcomes (job insecurity and somatic symptoms), and the extent to which the perpetrator's power moderates these relationships. Across two studies using different methods, we find that incidents of single perpetrator incivility are associated with target feelings of isolation and embarrassment, which in turn relate to targets' perceived job insecurity and somatic symptoms (Studies 1 and 2) both the same day and three days later (Study 2). Moreover, we find that perpetrator power moderates the relationship between incivility and embarrassment, such that targets are more embarrassed when the perpetrator is powerful. Implications for theory and practice are discussed. Copyright © 2017 John Wiley & Sons, Ltd. 相似文献
115.
116.
核电厂核事故应急疏散研究 总被引:1,自引:1,他引:0
根据我国法规、标准与美国核管委对核电厂核事故应急疏散的要求,考虑我国核电厂特殊的厂址条件与社会环境,分析核事故应急疏散的可行性。通过应急疏散行为研究、厂区的交通需求估计和路网分析,对不同情境,考虑核事故应急疏散的特殊问题,分别采用人工容量分析与宏观仿真模拟得到应急疏散时间。针对某核电厂,给出核事故应急疏散分析的一般步骤、方法与计算结果。对宏观仿真模型的主要参数进行灵敏度分析,找出影响应急疏散时间的主要因素,提出缩短应急疏散时间的针对性措施。 相似文献
117.
电解法处理含镍废水及纯镍的回收 总被引:1,自引:0,他引:1
雷英春 《城市环境与城市生态》2009,(3)
采用电解回收法处理Ni2+含量为2g/L的废水,在阴极回收纯镍。研究了电解电流、极距、NH4Cl浓度、pH值等因素对Ni2+去除率、槽压、阴极能耗的影响,得出最优工艺参数为:温度20℃,电解时间20min时、电解电流300mA,极距15mm,NH4Cl浓度5g/L,pH值8.0,该条件下Ni2+去除率为96.926%,槽压16.21V,阴极能耗22.418kW.h/kg,在阴极可得到沉积6.45μm厚的镍板。 相似文献
118.
John B. Erdmann Heinz G. Stefan Patrick L. Brezonik 《Journal of the American Water Resources Association》1994,30(6):1043-1053
ABSTRACT: Suspended solids and ammonium concentration profiles measured at five locations in Duluth-Superior Harbor during July-October 1985 were analyzed to quantify wind and ship effects on sediment resuspension and resulting harbor water quality. Wind components from the SE quadrant correlated strongly with depth-averaged suspended solids concentrations that were unaffected by ship passage or thermal stratification. Winds from that quadrant have the largest fetch in the harbor. The highest correlation (r2= 0.93) was with the 6-hour average of the ESE wind velocity component. Multiple linear regression analysis of data from post-ship passage concentration profiles yielded numerical estimates of settling velocities of 0.08 to 0.25 cm s?1, typical of ship-resuspended sediments, and vertical eddy diffusivities of 4 to 13 cm2 s1. The results suggest that ambient vertical eddy diffusivities in the harbor are less than 4 cm2 s?1 in the absence of ship passages and with winds less than 5 m s?1 (10 knots). 相似文献
119.
M. Hossein Sabet James Q. Coe 《Journal of the American Water Resources Association》1986,22(4):587-596
ABSTRACT: A large-scale simulation/optimization model provides schedules for operation of water and power for the California State Water Project (SWP). The SWP consists of a series of reservoirs linked by rivers, pumping plants, canals, tunnels, and generating plants and is operated by the California Department of Water Resources. The Department provides water to municipal and agricultural users, and manages its electrical loads and resources. The model, therefore, performs hydraulic and electrical computations leading to optimal operation of the entire system. It consists of hydraulic network programming components to meet the storage objectives at all the reservoirs, a linear programming component to determine the schedules at pumping and generating plants, an electrical network programming component to balance electrical loads and resources, and a number of other simulation components. It operates on yearly, weekly, and daily bases. It is primarily used for real-time operation of the SWP and can provide hourly detail schedules which are implemented by the SWP staff via a computerized system. 相似文献
120.
David R. Sager Clarence R. Cofield 《Journal of the American Water Resources Association》1984,20(3):359-363
Bluegill (Lepotmis macrochirus), largemouth bass (Micropterus salmoides), white catfish (Ictalurus catus), and channel catfish (Ictalurus punctatus), collected from an electric power plant cooling reservoir and a municipal water supply reservoir near Roxboro, North Carolina, were analyzed for selenium concentrations in axial muscle, reproductive and liver tissues. Fishes from the municipal water reservoir had lower selenium concentrations (≤0.2-2.1 μg/g - wet weight) than found in the cooling reservoir fishes (1.6-70.0 μg/g - wet weight) but similar distributions of concentrations among the tissues was evident. Selenium was differentially accumulated, with higher concentrations in liver tissues (0.7-70.0 μg/g - wet weight), followed by female reproductive tissues (0.7-25.0 μg/g - wet weight), axial muscle tissues (≤0.2-23.0 μg/g - wet weight) and male reproductive tissues (0.2-7.2 μg/g - wet weight). 相似文献