全文获取类型
收费全文 | 95086篇 |
免费 | 1237篇 |
国内免费 | 1312篇 |
专业分类
安全科学 | 3845篇 |
废物处理 | 3593篇 |
环保管理 | 14416篇 |
综合类 | 21509篇 |
基础理论 | 26862篇 |
环境理论 | 73篇 |
污染及防治 | 16863篇 |
评价与监测 | 5752篇 |
社会与环境 | 4148篇 |
灾害及防治 | 574篇 |
出版年
2022年 | 841篇 |
2021年 | 848篇 |
2020年 | 678篇 |
2019年 | 898篇 |
2018年 | 1269篇 |
2017年 | 1260篇 |
2016年 | 2268篇 |
2015年 | 1868篇 |
2014年 | 2603篇 |
2013年 | 9282篇 |
2012年 | 2446篇 |
2011年 | 2882篇 |
2010年 | 3388篇 |
2009年 | 3530篇 |
2008年 | 2485篇 |
2007年 | 2370篇 |
2006年 | 2588篇 |
2005年 | 2524篇 |
2004年 | 2780篇 |
2003年 | 2685篇 |
2002年 | 2179篇 |
2001年 | 2608篇 |
2000年 | 2183篇 |
1999年 | 1590篇 |
1998年 | 1386篇 |
1997年 | 1384篇 |
1996年 | 1520篇 |
1995年 | 1600篇 |
1994年 | 1495篇 |
1993年 | 1348篇 |
1992年 | 1349篇 |
1991年 | 1304篇 |
1990年 | 1269篇 |
1989年 | 1222篇 |
1988年 | 1052篇 |
1987年 | 1001篇 |
1986年 | 994篇 |
1985年 | 1077篇 |
1984年 | 1161篇 |
1983年 | 1176篇 |
1982年 | 1173篇 |
1981年 | 1095篇 |
1980年 | 953篇 |
1979年 | 922篇 |
1978年 | 826篇 |
1977年 | 712篇 |
1976年 | 638篇 |
1975年 | 607篇 |
1973年 | 630篇 |
1972年 | 643篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
961.
Turnover potentially leads to a new individual being selected into a work team. This study investigated the safety-specific trust which team members place in their organisation’s selection and induction processes, and related this to the perceived risk from new employees. The research was conducted with teams working in forest harvesting, an occupation which has high-turnover, high risk and a high accident rate. Results indicate that trust in induction processes was negatively correlated with perceived risk from a new employee. Team members also engaged in a number of safety ensuring behaviours when a new individual joined the team, and these were related to the level of perceived risk, and how much they cared about their team members’ safety. It is argued that trust in the safety-specific characteristics of an organisation’s selection and induction process may have negative consequences for safety. 相似文献
962.
Importance Measures (IMs) are used to rank the contributions of components or basic events to the system performance, e.g. its reliability or risk. Most times, IMs are calculated without due account of the uncertainties in the model of the behavior of the system. The objective of this work is to investigate how uncertainties can influence IMs and to develop a method for giving them due account in the corresponding ranking of the components or basic events. The uncertainties considered in this work affect the model parameters values and are assumed to be described by probability density functions. The method for ranking the contributors to the system performance measure is applied to the auxiliary feedwater system of a nuclear pressurized water reactor. 相似文献
963.
This paper presents and tests an integrative model of voluntary learning behavior. Drawing on social exchange theory, we argue that individuals are more likely to pursue learning activities when they identify with their employing organization and have a high quality leader–member exchange (LMX) relationship with their supervisor. We further argue that organizational identification is enhanced by both distributive and procedural fairness, whereas LMX quality is enhanced by interpersonal and informational fairness. Moreover, we contend that effective learning behavior improves job performance. The model was tested with a sample of 398 employees from a large automobile dealership. Results supported most predictions. Copyright © 2009 John Wiley & Sons, Ltd. 相似文献
964.
Obtaining knowledge about factors affecting health, safety and environment (HSE) is of major interest to the petroleum industry, but there is currently a severe shortage of relevant studies. The aim of this study was to examine the relative influence of offshore installation (local working environment) and company belonging on employees’ opinions concerning occupational health and safety. We analyzed data from a safety climate survey answered by 4479 Norwegian offshore petroleum employees in 2005 on the dimensions “Safety prioritisation”, “Safety management and involvement”, “Safety versus production”, “Individual motivation”, “System comprehension” and “Competence” using one way analysis of variance (ANOVA), effect size and mixed model. The companies differed significantly for “Safety prioritisation”, “Safety versus production”, “Individual motivation”, “System comprehension” and “Competence”. The local offshore installation explained more of the safety climate than the company they were employed in or worked for did. 相似文献
965.
Sinkings of fishing vessels, when accompanied by human loss, are accidents which lead to a great social upheaval, especially in the local area where they occur. In order to avoid or reduce these accidents, national governments must include in their legislation for this sector the appropriate safety measures. These resources and their distribution must be assigned in accordance with the needs of the accidentality, this requiring a detailed knowledge of the concentration of accidentality of a country’s fishing sector. In this context, the aim of the present work is twofold: first, to formulate a methodology for the fishing sector of a country, allowing the inequalities in the concentration of sinking accidents to be analysed; and second, to apply this methodology to the Spanish fishing fleet. Thus, two indices are constructed per region and type of fishing, for two variables: fishermen and vessels. Results are obtained both for the concentration of accidents and the associated Lorenz curves. An increase in the inequality in the spatial and functional distribution of these accidents is verified. 相似文献
966.
The paper describes a programme to develop the profile of major accident risk across a large multi national oil company. It describes the concepts, tools and processes for constructing the risk profile and some of the key learnings from the exercise. 相似文献
967.
968.
969.
Ali-Khodja H Belaala A Demmane-Debbih W Habbas B Boumagoura N 《Environmental monitoring and assessment》2008,138(1-3):219-231
Total suspended particulate matter and deposition fluxes of particles were investigated in the town of Didouche Mourad which
is located 13 km north of Constantine. Samples of air particulate matter were collected at one site located in the heart of
the town and situated 3 km north of a cement plant. Samples were collected from 2 November 2002 to 28 April 2003 every 3 days
using a high volume air sampler. Sampling intervals were 24 h in all cases. During the same period, samples of dust fallout
were collected at the same site. Samples were collected at 30-day intervals. Lead, chromium, manganese, nickel, copper, cobalt
and cadmium deposition fluxes were measured and both the soluble and insoluble fractions were determined. Furthermore, the
information gathered by this study was correlated with the corresponding hourly weather data provided by a weather station
installed at the study station. The possible sources for dust and trace metals were analyzed by comparing average contributions
of wind aspects to the concentrations and depositions of mass and chemical species with the average frequencies of wind direction.
The mean concentration was 300 μg/m3. The average dust deposition rate through the period of study was 221 mg/(m2.day). Results indicate that anthropogenic sources contribute greatly to trace elements. An exposure assessment to the heavy
metals taking into account the inhalation route and soil dust ingestion was carried out and allowed direct comparison of trace
metal intakes via these routes. 相似文献
970.
Bhattacharyya P Mitra A Chakrabarti K Chattopadhyay DJ Chakraborty A Kim K 《Environmental monitoring and assessment》2008,139(1-3):299-306
The present investigation deals with the limnobiotic status of Almatti reservoir from February, 2003 to January, 2005. The
study revealed that, the distribution and population density of zooplankton species depend upon the physico-chemical factors
of the environment. Statistical analysis showed that there exists a significant relation between the biological and non-biological
factors. The benthic fauna constituting the food of fish can be utilized for extensive culture operation so that the nutrients
in the reservoir are not only properly cycled but also serve as a check on further eutrophication. 相似文献