全文获取类型
收费全文 | 709篇 |
免费 | 0篇 |
国内免费 | 36篇 |
专业分类
安全科学 | 55篇 |
废物处理 | 46篇 |
环保管理 | 54篇 |
综合类 | 63篇 |
基础理论 | 87篇 |
环境理论 | 1篇 |
污染及防治 | 307篇 |
评价与监测 | 91篇 |
社会与环境 | 37篇 |
灾害及防治 | 4篇 |
出版年
2023年 | 23篇 |
2022年 | 78篇 |
2021年 | 73篇 |
2020年 | 16篇 |
2019年 | 25篇 |
2018年 | 16篇 |
2017年 | 32篇 |
2016年 | 28篇 |
2015年 | 13篇 |
2014年 | 23篇 |
2013年 | 67篇 |
2012年 | 34篇 |
2011年 | 43篇 |
2010年 | 29篇 |
2009年 | 25篇 |
2008年 | 20篇 |
2007年 | 29篇 |
2006年 | 13篇 |
2005年 | 12篇 |
2004年 | 10篇 |
2003年 | 15篇 |
2002年 | 16篇 |
2001年 | 15篇 |
2000年 | 9篇 |
1999年 | 8篇 |
1998年 | 3篇 |
1997年 | 7篇 |
1996年 | 3篇 |
1994年 | 2篇 |
1993年 | 2篇 |
1992年 | 2篇 |
1991年 | 6篇 |
1990年 | 3篇 |
1988年 | 3篇 |
1987年 | 4篇 |
1986年 | 2篇 |
1985年 | 4篇 |
1984年 | 4篇 |
1983年 | 3篇 |
1982年 | 3篇 |
1981年 | 2篇 |
1980年 | 4篇 |
1979年 | 4篇 |
1978年 | 2篇 |
1974年 | 1篇 |
1971年 | 1篇 |
1968年 | 1篇 |
1962年 | 1篇 |
1961年 | 1篇 |
1959年 | 1篇 |
排序方式: 共有745条查询结果,搜索用时 390 毫秒
251.
Simon P. Boilard Paul R. Amyotte Faisal I. Khan Ashok G. Dastidar Rolf K. Eckhoff 《Journal of Loss Prevention in the Process Industries》2013,26(6):1646-1654
Explosibility of micron- and nano-titanium was determined and compared according to explosion severity and likelihood using standard dust explosion equipment. ASTM methods were followed using a Siwek 20-L explosion chamber, MIKE 3 apparatus and BAM oven. The explosibility parameters investigated for both size ranges of titanium include explosion severity (maximum explosion pressure (Pmax) and size-normalized maximum rate of pressure rise (KSt)) and explosion likelihood (minimum explosible concentration (MEC), minimum ignition energy (MIE) and minimum ignition temperature (MIT)). Titanium particle sizes were ?100 mesh (<150 μm), ?325 mesh (<45 μm), ≤20 μm, 150 nm, 60–80 nm, and 40–60 nm. The results show a significant increase in explosion severity as the particle size decreases from ?100 mesh with an apparent plateau being reached at ?325 mesh and ≤20 μm. Micron-size explosion severity could not be compared with that for nano-titanium due to pre-ignition of the nano-powder in the 20-L chamber. The likelihood of an explosion increases significantly as the particle size decreases into the nano range. Nano-titanium is very sensitive and can self-ignite under the appropriate conditions. The explosive properties of the nano-titanium can be suppressed by adding nano-titanium dioxide to the dust mixture. Safety precautions and procedures for the nano-titanium are also discussed. 相似文献
252.
Chris T. Cloney Robert C. Ripley Paul R. Amyotte Faisal I. Khan 《Journal of Loss Prevention in the Process Industries》2013,26(6):1574-1582
Computational fluid dynamics is used to investigate the preconditioning aspect of overdriving in dust explosion testing. The results show that preconditioning alters both the particle temperature and distribution prior to flame propagation in the 20-L chamber. A parametric study gives the fluid pressure and temperature, and particle temperature and concentration at an assumed flame kernel development time (10 ms) for varying ignitor size and particle diameter. For the 10 kJ ignitor with 50% efficiency, polyethylene particles under 50 μm reach 400 K and may melt prior to flame propagation. Gases from the ignitor detonation displace the dust from the center of the chamber and may increase local particle concentration up to two times the nominal value being tested. These effects have important implications for explosive testing of dusts in the 20-L chamber and comparing to larger 1-m3 testing, where these effects may be negligible. 相似文献
253.
Nima Khakzad Faisal Khan Paul Amyotte 《Process Safety and Environmental Protection》2013,91(1-2):46-53
Among the various techniques used for safety analysis of process systems, bow-tie (BT) analysis is becoming a popular technique as it represents an accident scenario from causes to effects. However, the BT application in the dynamic safety analysis is limited due to the static nature of its components, i.e. fault tree and event tree. It is therefore difficult in BT to take accident precursors into account to update the probability of events and the consequent risk. Also, BT is unable to represent conditional dependency. Event dependency is common among primary events and safety barriers. The current paper illustrates how Bayesian network (BN) helps to overcome these limitations. It has also been shown that BN can be used in dynamic safety analysis of a wide range of accident scenarios due to its flexible structure. This paper also introduces the application of probability adapting in dynamic safety analysis rather than probability updating. A case study from the U.S. Chemical Safety Board has been used to illustrate the application of both BT and BN techniques, with a comparison of the results from each technique. 相似文献
254.
Ming Yang Faisal I. Khan Leonard Lye 《Process Safety and Environmental Protection》2013,91(5):333-342
Due to a scarcity of data, the estimate of the frequency of a rare event is a consistently challenging problem in probabilistic risk assessment (PRA). However, the use of precursor data has been shown to help in obtaining more accurate estimates. Moreover, the use of hyper-priors to represent prior parameters in the hierarchical Bayesian approach (HBA) generates more consistent results in comparison to the conventional Bayesian method. This study proposes a framework that uses a precursor-based HBA for rare event frequency estimation. The proposed method is demonstrated using the recent BP Deepwater Horizon accident in the Gulf of Mexico. The conventional Bayesian method is also applied to the same case study. The results show that the proposed approach is more effective with regards to the following perspectives: (a) using the HBA in the proposed framework provides an opportunity to take full advantage of the sparse data available and add information from indirect but relevant data; (b) the HBA is more sensitive to changes in precursor data than the conventional Bayesian method; and (c) using hyper-priors to represent prior parameters, the HBA is able to model the variability that can exist among different sources of data. 相似文献
255.
Iqbal Ahmed Khan Zulquernain Mallick 《International journal of occupational safety and ergonomics》2013,19(2):127-136
This paper presents a study in which the main objective was to investigate the combined effect of noise and vibration on the performance of a readability task in a mobile driving environment. Subjects performed a readability task on a laptop computer in a sitting posture with their backs supported with a backrest under varying levels of noise and vibration. The data in terms of the mean number of characters read per minute were collected and statistically analyzed. Results showed that the individual effect of noise, vibration, and the operators’ gender as well as the interaction between gender and noise, and gender and vibration were statistically significant. However, the combined effect of noise and vibration was not found to be statistically significant. Results also indicated that gender was statistically significant at all levels of noise as well as vibration, and noise and vibration were statistically significant at both levels of gender. 相似文献
256.
257.
Irfan A. Khan 《Journal of the American Water Resources Association》1980,16(5):866-873
ABSTRACT: A solution procedure to solve the inverse problem in ground water, based on lumped approach, has been proposed. The method has the following advantages: 1) exact determination of the boundary conditions and the physical laws of flow through porous media is not required; 2) all errors of approximation in describing the boundary conditions, physical laws, and the aquifer properties are lumped into the surrogate parameters; and 3) the same mathematical model can be employed both in the identification process and in the subsequent management studies. The optimal values of the surrogate parameters are found by using a multidimensional unconstrained optimization code devised by Powell. The solution procedure and the convergence characteristics of the proposed algorithm have been illustrated by two hypothetical problems. 相似文献
258.
M Khan 《Journal of environmental science and health. Part. B》1983,18(6):781-793
5-Bromoindole carboxylic acid and substituted indoles were administered parenterally to hamsters infected with an Egyptian strain of S. mansoni, to assess their antischistosomal activity. 5-Bromoindole showed a significant hepatic shift in 59 percent of treated hamsters. The results suggest that modification of the indole nucleus may produce a series of antischistosomal agents. 相似文献
259.
Kabir-Ur-Rahman Khan 《Resources Policy》1983,9(4):300
260.
Accumulation of Pb, Cu, and Zn in native plants growing on contaminated
sites and their potential accumulation capacity in Heqing, Yunnan 总被引:3,自引:1,他引:2
LIU Xiaohai GAO Yuntao Sardar Khan DUAN Gang CHEN Aikui LING Li ZHAO Lei LIU Zhonghan WU Xuecan 《环境科学学报(英文版)》2008,20(12):1469-1474
Phytoremediation is one of the cost-effective and environmental friendly technologies used to remove contaminants from contaminated soils,which has been intensively studied during the last decade.Presently,few economical and effective remediation methods are available for the remediation of Pb contaminated sites.This study was conducted to assess the potential of 19 plants growing on contaminated sites in Pb mine area.Plants and associated soil samples were collected and analyzed for total metal concentrati... 相似文献