全文获取类型
收费全文 | 69篇 |
免费 | 15篇 |
国内免费 | 16篇 |
专业分类
安全科学 | 38篇 |
废物处理 | 4篇 |
环保管理 | 4篇 |
综合类 | 34篇 |
基础理论 | 2篇 |
污染及防治 | 12篇 |
评价与监测 | 2篇 |
社会与环境 | 4篇 |
出版年
2023年 | 1篇 |
2022年 | 8篇 |
2021年 | 7篇 |
2020年 | 2篇 |
2018年 | 2篇 |
2017年 | 5篇 |
2016年 | 4篇 |
2015年 | 2篇 |
2014年 | 5篇 |
2013年 | 7篇 |
2012年 | 7篇 |
2011年 | 3篇 |
2010年 | 6篇 |
2009年 | 6篇 |
2008年 | 1篇 |
2007年 | 4篇 |
2006年 | 10篇 |
2005年 | 3篇 |
2004年 | 3篇 |
2003年 | 1篇 |
2002年 | 2篇 |
2001年 | 3篇 |
2000年 | 1篇 |
1999年 | 2篇 |
1998年 | 2篇 |
1995年 | 2篇 |
1993年 | 1篇 |
排序方式: 共有100条查询结果,搜索用时 15 毫秒
61.
为保障天然气工业安全生产与运营,以某天然气储配厂为例,采用等效喷嘴和过程模型,利用FLACS软件对罐区高压天然气非恒定速率泄漏扩散进行数值模拟,考察环境风速及泄漏时间对气体泄漏扩散的影响.结果表明:储存压力为1.05 MPa的天然气储罐发生泄漏会产生欠膨胀射流,泄漏初期具有447.44 kJ的高动能,并在近场扩散起主导... 相似文献
62.
63.
分析了选钛厂主流程生产现状,针对工艺中存在的问题,根据新设备、新技术在选钛厂的成功实践,提出了优化工艺流程思路,减少了不安全因素和产尘点,以提高主流程重选作业收率,增加选钛厂钛精矿产量. 相似文献
64.
65.
Increasing petroleum prices, increasing threat to the environment from exhaust emissions and global warming have generated intense international interest in developing renewable and alternative non-petroleum fuels for engines. Evolving technology and a recurring energy crisis necessitates a continuous investigation into the search for sustainable and clean-burning renewable fuels. In this paper, cottonseed oil methyl ester (COME) was used in a four-stroke, single-cylinder variable compression ratio diesel engine. Tests were carried out to study the effects of fuel injection timing, fuel injector opening pressure (IOP) and injector nozzle geometry on the performance and combustion of COME biodiesel fuel used in a compression ignition engine with a single fuel mode. Fuel injection timing varied from 19° to 27° before top dead centre (bTDC) in incremental steps of 4° bTDC; fuel IOP varied from 210 to 240 bar in incremental steps of 10 bar. Fuel nozzle injectors with three, four and five holes, each of 0.3 mm size, were selected for the study. The results suggested that with retarded injection timing of 19° bTDC, increased IOP of 230 bar and a four-hole nozzle injector of 0.3 mm size resulted in overall better engine performance with an increased brake thermal efficiency and reduced HC, CO and smoke emission levels. 相似文献
66.
中试螺旋式自循环厌氧反应器处理安乃近制药废水的稳定性能简 总被引:1,自引:0,他引:1
以制药废水实验了50 m3螺旋式厌氧反应器(SPAC反应器)的稳定性。采用Augmented Dickey-Fuller(ADF)单位根检验表明,螺旋式反应器具有良好的启动和运行稳定性。负荷冲击实验显示,SPAC反应器具有较好的耐浓度冲击能力和耐水力冲击能力,所能耐受的最大浓度冲击强度大于60 000 (mg·h)/L(进水浓度提升2倍),所能耐受的最大水力冲击强度为300(m3·h)/d(进水流量提升50%)。SPAC反应器还具备受扰恢复能力。在反应液pH低于5.74,出水浓度、COD去除率和容积COD去除速率(VRR)分别为3 500 mg/L、22.30%和2.52 kg/(m3·d)的工况下,经过30 d恢复,出水浓度、COD去除率和VRR的恢复程度达到80%~90%。 相似文献
67.
针对闸阀阀杆填料密封泄漏的问题,介绍了密封填料的选择和闸阀填料压盖密封件结构的技术改进措施.实践证明,闸阀填料密封件的改造不仅能够解决密封渗漏,消除安全隐患,而且取得了较好的经济效益. 相似文献
68.
69.
Yanlin Wu Haixia Yuan Xiaoxuan Jiang Guanran Wei Chunlei Li Wenbo Dong 《环境科学学报(英文版)》2012,24(9):1679-1685
A spiral photoreactor system (SPS) was developed for the degradation of 4-tert-octylphenol (4-t-OP) in aqueous phase. 4-t-OP was previously considered as a endocrine disrupting compound frequently present in water. The direct photodegradation reaction caused by the SPS was found to accord with the characteristic of apparent first-order reaction with reaction rate constantk= 4.8 × 10-2 min-1. However, the direct photodegradation reaction could not make the 4-t-OP mineralized. The photodegradation efficiency increased from 88% to 91.2% in 45 min irradiation period after the internal surface of SPS was sintered with TiO2 thin film as catalyst. Catalyst concentration, number of catalyst coating layers and initial concentration of 4-t-OP were proven to be the factors affecting the photocatalytic degradation performance of the SPS on aqueous 4-t-OP. The degradation mechanism was investigated and the byproducts were analyzed using total organic carbon analyzer (TOC) and LC-MS. The possible chemical structures of the products were suggested. SPS with single layer of TiO2 prepared by sintering 13.6% of TiO2 precursor was proven to be more efficient than most of previous systems for removal of 4-t-OP from aqueous phase. 28.3% of the 4-t-OP was mineralized in 45 min according to the decreased amount of TOC value. 相似文献
70.
滚筒设计参数对粉尘爆炸率影响的研究 总被引:2,自引:0,他引:2
李晓豁 《中国安全科学学报》2007,17(6):103-107
利用所建立的数学模型,以国产某型滚筒式采煤机为例,采用计算机模拟的方法,得到了采煤机最大切屑厚度、每线齿数、牵引速度、截线间距、滚筒转速、滚筒直径、叶片头数以及煤岩破碎性能指标与粉尘爆炸率之间的关系曲线,通过分析,确定了各参数对粉尘爆炸率的影响,为预测采煤机工作对粉尘爆炸率的影响、完善采煤机工作性能的评价体系,为改进机器设计、减小采煤机的截割粉尘、降低粉尘爆炸率、提高煤炭生产的安全性提供理论依据。 相似文献