全文获取类型
收费全文 | 619篇 |
免费 | 87篇 |
国内免费 | 163篇 |
专业分类
安全科学 | 140篇 |
废物处理 | 29篇 |
环保管理 | 71篇 |
综合类 | 416篇 |
基础理论 | 50篇 |
污染及防治 | 92篇 |
评价与监测 | 33篇 |
社会与环境 | 21篇 |
灾害及防治 | 17篇 |
出版年
2024年 | 4篇 |
2023年 | 14篇 |
2022年 | 28篇 |
2021年 | 30篇 |
2020年 | 16篇 |
2019年 | 23篇 |
2018年 | 18篇 |
2017年 | 21篇 |
2016年 | 32篇 |
2015年 | 35篇 |
2014年 | 42篇 |
2013年 | 72篇 |
2012年 | 74篇 |
2011年 | 54篇 |
2010年 | 33篇 |
2009年 | 36篇 |
2008年 | 36篇 |
2007年 | 52篇 |
2006年 | 40篇 |
2005年 | 28篇 |
2004年 | 28篇 |
2003年 | 31篇 |
2002年 | 18篇 |
2001年 | 25篇 |
2000年 | 10篇 |
1999年 | 11篇 |
1998年 | 14篇 |
1997年 | 15篇 |
1996年 | 6篇 |
1995年 | 5篇 |
1994年 | 1篇 |
1993年 | 3篇 |
1992年 | 5篇 |
1991年 | 2篇 |
1986年 | 1篇 |
1985年 | 1篇 |
1982年 | 2篇 |
1979年 | 1篇 |
1975年 | 1篇 |
1974年 | 1篇 |
排序方式: 共有869条查询结果,搜索用时 15 毫秒
61.
基于主成分分析法的危险货物运输企业安全评价 总被引:2,自引:0,他引:2
为更准确地评估危险货物运输企业安全等级以降低其运输风险,提出基于主成分分析法(PCA)的危险货物运输企业BP神经网络安全评价模型;在从人-机-物-环境-管理角度构建危险货物运输企业安全评价指标的基础上,分别利用该模型和其他3种模型对3家实例企业进行仿真评价和对比分析。结果表明,该模型的评价结果与期望值间的相对误差约为0.5%~1.2%,计算精度优于其他模型,且具有计算量小等特点。 相似文献
62.
Khamisah Awang Lukman Mohammad Saffree Jeffree Krishna Gopal Rampal 《International journal of occupational safety and ergonomics》2019,25(1):8-16
A cross-sectional study was undertaken to determine the prevalence of lower back pain (LBP) and its association with whole-body vibration (WBV) and manual materials handling (MMH). We studied 110 commercial vehicle drivers using a self-administered questionnaire and the VI-400Pro human vibration monitor. Prevalence of LBP was 66.4%. The percentage of drivers who had frequent manual handling of heavy loads was 45.5% and those who handled heavy loads in awkward postures accounted for 86.4%. Daily vibration A(8) averaged on the z axis was 0.25 (0.06) m·s?2 and at vector sum was 0.29 (0.07) m·s?2. Daily vibration exposures on the z axis, frequent manual handling of heavy loads and awkward posture during MMH were significantly associated with LBP. Drivers who are exposed to WBV and frequently handle heavy loads manually and with awkward postures probably have more LBP than drivers who are exposed to only one of these risk factors. 相似文献
63.
生淀粉糖化酶产生菌Aspergillus niger(6#)的分离筛选及其产酶条件 总被引:6,自引:0,他引:6
从大曲中分离到了1株降解生淀粉能力较强的黑曲霉Aspergillusniger(6#).固体发酵酶活可达2461U/g,RDA值为21.47%;液体发酵酶活可达353U/mL,RDA值为20.30%.以6#菌为实验材料,进一步考察了氮源、碳源及pH对生淀粉糖化酶形成的影响.实验结果表明,无机氮源NaNO3较有机氮源蛋白胨更有利于生淀粉糖化酶的形成;pH是影响生淀粉糖化酶形成的重要因素,低pH会阻遏生淀粉糖化酶的形成;玉米粉和麦芽糖较其它碳源更有利于生淀粉糖化酶的形成.图4表2参12 相似文献
64.
塑料给水管材的选用分析 总被引:1,自引:0,他引:1
杨梓根 《湖南环境生物职业技术学院学报》2003,9(2):138-140
给水工程中如何根据不同的场合选用合适的塑料给水管材,本文从可靠性、使用寿命和工程造价等方面进行了阐述. 相似文献
65.
还田秸秆配施外源纤维素酶效应研究 总被引:3,自引:1,他引:3
为探求促进秸秆降解的新途径,采用室内培养法研究了外源纤维素酶对秸秆降解速率及土壤速效养分的影响。结果表明,整个培养期内,小麦秸秆,玉米秸秆加酶处理与不加酶处理降解率都存在极显著差异(p<0.01),到培养结束时小麦秸秆加酶处理降解率高出不加酶处理7.10%~11.86%,玉米秸秆高出8.01%~14.04%;整个培养期内,小麦秸秆,玉米秸秆加酶处理与不加酶处理间土壤速效氮、磷、钾含量都存在极显著差异(p<0.01),培养结束时,小麦秸秆最优处理速效氮、磷、钾含量高出对照4.15mg·kg-1,3.60mg·kg-1,32.35mg·kg-1,玉米秸秆高出6.50mg·kg-1,4.27mg·kg-1,47.97mg·kg-1。结果说明添加外源纤维素酶能够提高秸秆降解速率,促进秸秆养分矿化。 相似文献
66.
Indoor radon has been recognized as one of the health hazards for mankind. Common building materials used for construction
of houses, which are considered as one of the major sources of this gas in indoor environment, have been studied for exhalation
rate of radon. Non-nuclear industries, such as coal fired power plants or fertilizer production facilities, generate large
amounts of waste gypsum as by-products. Compared to other building materials waste gypsum from fertilizer production facilities
(phosphogypsum) shows increased rates of radon exhalation. In the present, investigation solid state alpha track detectors,
CR-39 plastic detectors, were used to measure the indoor radon concentration and the radon exhalation rates from some building
materials used in Egypt. The indoor radon concentration and the radon exhalation rate ranges were found to be 24–55 Bq m−3 and 11–223 mBq m−2 h−1, respectively. The effective dose equivalent range for the indoor was found 0.6–1.4 mSv y−1. The equilibrium factor between radon and its daughters increased with the increase of relative humidity. 相似文献
67.
Ahmad R. Shouman 《Journal of Loss Prevention in the Process Industries》1998,11(6):383-390
A very simple solution to the thermal explosion problem for one-dimensional solids is presented. The solution produces analytical expressions for the criticality condition. Two different solutions are used. One solution gives higher answers than those known from exact solutions and the second solution gives lower answers. This allows bracketing the expected answer with a determined tolerance. The results obtained compare quite favorably with those obtained from known exact numerical solutions. This allows the utilization of the present method for many a practical problem with an acceptable tolerances. 相似文献
68.
Vincent T. Breslin Ufuk Senturk Christopher C. Berndt 《Resources, Conservation and Recycling》1998,23(4):243-258
Plastic lumber manufactured using post consumer waste plastic has been proposed as an acceptable material for use in the construction of docks, piers and bulkheads and is touted to outlast conventional wood products due to its strength, durability and resistance to rot. This study examines the long-term engineering properties of plastic lumber manufactured using post consumer waste plastic (TRIMAX, Ronkonkoma, NY). Plastic lumber profiles were used in the decking of a pier built in West Meadow Creek, Old Field, NY during December 1995. Samples of plastic lumber were removed from the deck of the pier periodically over a two-year period and returned to the laboratory for testing. Results of engineering tests showed the in-plane compression modulus (260±30 MPa), dimensional stability and the Shore D surface hardness (60±2) of plastic lumber removed from the pier remained similar to or greater than their pre-placement values. In contrast, significant changes in the modulus of elasticity of plastic lumber were measured with prolonged weathering. The modulus of elasticity of plastic lumber initially decreased from 1370 Pa to 750 Pa following 12 months weathering, a decrease equal to 45% of its pre-placement value and then increased during the second year to close to its initial value. The high variability in the modulus of elasticity should restrict the use of plastic lumber profiles to non-load bearing structural applications. 相似文献
69.
汽车内饰材料的人工老化试验 总被引:1,自引:2,他引:1
讨论了光的能量和辐射强度、环境温度和湿度对汽车内饰材料老化的作用,介绍了国外广泛使用于汽车内饰材料老化的试验方法和试验设备,认为以氙灯和金属卤素灯为光源的试验设备配置适当的滤波器可进行模拟性最好的人工老化试验,建议加强汽车用材料的老化试验技术和评价方法的研究,尽快制定我国的汽车内饰材料老化试验方法的标准. 相似文献
70.