全文获取类型
收费全文 | 2456篇 |
免费 | 53篇 |
国内免费 | 46篇 |
专业分类
安全科学 | 1267篇 |
废物处理 | 19篇 |
环保管理 | 192篇 |
综合类 | 735篇 |
基础理论 | 68篇 |
环境理论 | 1篇 |
污染及防治 | 60篇 |
评价与监测 | 93篇 |
社会与环境 | 38篇 |
灾害及防治 | 82篇 |
出版年
2024年 | 1篇 |
2023年 | 23篇 |
2022年 | 15篇 |
2021年 | 74篇 |
2020年 | 83篇 |
2019年 | 35篇 |
2018年 | 15篇 |
2017年 | 35篇 |
2016年 | 67篇 |
2015年 | 69篇 |
2014年 | 101篇 |
2013年 | 89篇 |
2012年 | 103篇 |
2011年 | 115篇 |
2010年 | 64篇 |
2009年 | 88篇 |
2008年 | 76篇 |
2007年 | 80篇 |
2006年 | 78篇 |
2005年 | 139篇 |
2004年 | 174篇 |
2003年 | 141篇 |
2002年 | 93篇 |
2001年 | 70篇 |
2000年 | 107篇 |
1999年 | 108篇 |
1998年 | 111篇 |
1997年 | 66篇 |
1996年 | 68篇 |
1995年 | 99篇 |
1994年 | 40篇 |
1993年 | 37篇 |
1992年 | 32篇 |
1991年 | 20篇 |
1990年 | 10篇 |
1989年 | 5篇 |
1988年 | 3篇 |
1987年 | 4篇 |
1986年 | 2篇 |
1985年 | 4篇 |
1984年 | 1篇 |
1983年 | 1篇 |
1979年 | 2篇 |
1978年 | 2篇 |
1977年 | 3篇 |
1970年 | 1篇 |
1967年 | 1篇 |
排序方式: 共有2555条查询结果,搜索用时 140 毫秒
251.
针对电厂机组大(小)修中所遇到的安全管理方面的各种实际问题,提出了针对性强、可操作性强、实用有效的防范措施和管理方法. 相似文献
252.
职业安全卫生标准体系建设初探 总被引:2,自引:2,他引:0
张兵科 《中国安全科学学报》2000,10(5):34-38
职业安全卫生标准体系是企业安全科研生产工作的基础 ,是推广试行职业安全卫生管理体系 (OHSMS)的有效技术支撑条件。笔者通过分析职业安全卫生标准应用的实际 ,探索性地提出建立适应企业职业安全卫生管理、研究以及 OHSMS需要的标准化管理体系 ;论述并研讨该体系建立的思路、原则和查询方法以及应用过程的管理 ;以此为职业安全卫生管理、研究和试行OHSMS奠定基础并提供有益的帮助。 相似文献
253.
通过行为模型,分析了企业中安全管理者与职工心态对立的原因,认为目前管理者奖罚手段运用失衡是产生这种局面的重要原因。从安全文化的角度提出了相应对策。 相似文献
254.
本文以我国1997—2010年的消费结构数据为基础,运用灰色-马尔科夫链模型对数据进行了分析和预测,然后通过MATLAB预测了我国未来十年的能源消费结构,结合我国政府承诺的非化石能源目标对模型预测结果做了进一步的修正,最后根据能源发展趋势给出了能源消费结构的优化策略。 相似文献
255.
256.
Process safety plays a key role in modern industries. This is more significant specifically in off-shore oil and gas platforms where releasing hydrocarbons could cause irreversible damages to both environment and personnel. An important instrument device which can provide safety for process equipment in oil and gas fields is safety relief valve. Correct sizing procedure of such devices depends strongly on physical properties of fluid and relieving condition. The present study revolved around applying thermodynamic concepts and modeling to throw some light on the behavior of trapped fluid exposed to fire in order to evaluate precise temperature and fluid properties at relieving condition. Peng–Robinson equation of state together with a three phase flash has been utilized to handle the calculation. Effect of different design parameters has been evaluated for three distinct categories of fluids namely natural gas, gas-condensate mixture, and gas-oil mixtures. These parameters encompass of operating temperature, operating pressure, Difference of Operating and Design Pressure, gas and oil specific gravities, gas-oil ratio, and water cut. The study depicted that American Petroleum Institute practice number 521 which suggests an ideal gas assumption fails to provide reliable predictions as it significantly overestimate the relieving temperature. Moreover, black oil correlations were also used for the relief temperature estimation of gas-oil-water mixtures. Comparison with HYSYS results as a prominent engineering software proved that black oil models are reliable tools to predict relief temperature. 相似文献
257.
Turnaround maintenance (TAM) is a usual plant shutdown that is done by process industries to perform asset inspections, repairs, and overhauls. TAM engineering projects are needed on a periodic basis to optimize a plant's performance. Process industrial plants usually don't have enough in-house manpower to carry out needed TAM jobs; it is not uncommon for a process industrial plant to outsource its TAM manpower supply to external contractors. This will create a peculiar management challenge regarding how to assure orientation of safety practices for the newly hired labor. Although accidents during process plant shutdowns may have severe consequences, the safety management systems in place for many companies only cover normal operations and few explicitly address TAM projects. Usually, contractors are evaluated from a safety perspective after handling the project by monitoring safety indicators such as number of injuries, incidents, etc. This paper emphasizes safety attributes to be included in selecting contractors at the bidding stage to assure loss prevention and better safety orientation during TAM implementation. The paper starts with reviewing TAM literature and defining main needed safety attributes to prequalify contractors. It develops an analytic hierarchy process (AHP) model that is applied to rank TAM contractors' selection. A case study is presented for a petrochemical plant in Saudi Arabia to demonstrate the AHP model. 相似文献
258.
259.
An integrated approach for performance assessment and management of safety barriers in a systemic manner is needed concerning the prevention and mitigation of major accidents in chemical process industries. Particularly, the effects of safety barriers on system risk reduction should be assessed in a dynamic manner to support the decision-making on safety barrier establishments and improvements. A simulation approach, named Simulink-based Safety Barrier Modeling (SSBM), is proposed in this paper to conduct dynamic risk assessment of chemical facilities with the consideration of the degradation of safety barriers. The main functional features of the SSBM include i) the basic model structures of SSBM can be determined based on bow-tie diagrams, ii) multiple data (periodic proof test data, continuous condition-monitoring data, and accident precursor data) may be combined to update barrier failure probabilities and initiating event probabilities, iii) SSBM is able to handle uncertainty propagation in probabilistic risk assessment by using Monte Carlo simulations, and iv) cost-effectiveness analysis (CEA) and optimization algorithms are integrated to support the decision-making on safety barrier establishments and improvements. An illustrative case study is demonstrated to show the procedures of applying the SSBM on dynamic risk-informed safety barrier management and validate the feasibility of implementing the SSBM for cost-effective safety barrier optimization. 相似文献
260.
Mixtures of biodiesel, glycerol, and ethanol/methanol are commonly processed and stored in biodiesel production. In this work, non-ideal models are used to calculate the Flash Points (FPs) of binary and ternary mixtures, using data available from different feedstocks. Despite the fact that biodiesel is considered safer than common diesel fuels, results show a synergistic effect of biodiesel/methanol and biodiesel/ethanol mixtures, resulting in a reduction of the flash point of mixtures to values lower than the ones of pure compounds. Most soluble ternary mixtures were found flammable, the only exception being mixtures with a relatively lower alcohol content (45% mol. ethanol or 42% methanol) at temperature lower than 303 K. Accidental increase in temperature can cause domino effect, due to the higher solubility and the formation of new flammable ternary mixtures. 相似文献