全文获取类型
收费全文 | 1625篇 |
免费 | 168篇 |
国内免费 | 39篇 |
专业分类
安全科学 | 1071篇 |
废物处理 | 34篇 |
环保管理 | 133篇 |
综合类 | 508篇 |
基础理论 | 5篇 |
污染及防治 | 31篇 |
评价与监测 | 2篇 |
社会与环境 | 2篇 |
灾害及防治 | 46篇 |
出版年
2024年 | 18篇 |
2023年 | 91篇 |
2022年 | 80篇 |
2021年 | 76篇 |
2020年 | 51篇 |
2019年 | 81篇 |
2018年 | 55篇 |
2017年 | 63篇 |
2016年 | 77篇 |
2015年 | 89篇 |
2014年 | 193篇 |
2013年 | 82篇 |
2012年 | 97篇 |
2011年 | 94篇 |
2010年 | 76篇 |
2009年 | 84篇 |
2008年 | 77篇 |
2007年 | 70篇 |
2006年 | 70篇 |
2005年 | 67篇 |
2004年 | 41篇 |
2003年 | 33篇 |
2002年 | 17篇 |
2001年 | 37篇 |
2000年 | 20篇 |
1999年 | 16篇 |
1998年 | 19篇 |
1997年 | 5篇 |
1996年 | 9篇 |
1995年 | 10篇 |
1994年 | 3篇 |
1993年 | 6篇 |
1992年 | 7篇 |
1991年 | 4篇 |
1990年 | 5篇 |
1989年 | 9篇 |
排序方式: 共有1832条查询结果,搜索用时 265 毫秒
51.
仝江 《安全.健康和环境》2013,(12):29-29
中原油田日前启动了消防安全“平安冬春”系列专项行动,消防支队在不同区域成立5个督导检查组,组织开展实施“地毯式”的专项检查行动,对辖区油气生产等单位进行油气管道检查,并对检查中新查出的事故隐患进行集中整治,严防隐患演变为事故。图为12月5日,河南省濮阳市中原油田消防支队应急救援五大队消防监督员正在采油五厂油气集输大队检查油气管道生产设备消防安全防患情况。 相似文献
52.
目的:了解石油管道储运员工的心理健康现状,建立管道储运员工症状自评量表(SCL-90)的群体常模。方法:运用整群抽样方法和症状自评量表(SCL-90)对5544名中国石化管道储运公司员工进行心理健康状况调查,将SCL-90结果与中国常模比较。结果:本次调查心理健康状况好3947人,占71.2%;心理健康状况良好1299人,占23.4%;心理健康状况一般238人,占4.3%;心理健康状况异常60人,占1.1%;石化管道储运员工在躯体化、焦虑、精神病性、阳性项目数均分显著高于全国常模;人际关系、敌对、偏执和精神病性因子均分男性显著高于女性,恐怖因子均分女性显著高于男性;35岁及以上组的躯体化、强迫、抑郁、焦虑、敌对、恐怖、精神病性以及阳性项目数的因子均分均高于35岁以下组;大专组和高中及以下组各项因子均分均显著高于本科及以上组。结论:管道储运员工心理健康状况低于一般人群。年龄相对较大以及学历相对较低员工的心理健康状况是企业关注的重点。 相似文献
53.
《安全.健康和环境》2012,(2):54-54
管帽和堵头——最后的防线!
一块杂物碎片从一临时脚手架上落下,击中了下方的一只直角回转球阀的直手柄,导致该阀被打开。这只阀安装在排空管(直径约20mm)上,该管与输送易燃物料的大口径工艺管道相连接,导致易燃性物料从排空口泄漏出来,随后被点燃。由此引发的大火造成1名承包商员工死亡,另外2人被严重烧伤。 相似文献
54.
55.
56.
管道风险评价作为管道风险管理的基础,其目的是通过计算某段管道或整条管道系统的风险值对各个管段(或各条管道)进行风险排序,以识别高风险的部位,确定那些最大可能导致管道事故和有利于潜在事故预防的至关重要的因素,确定管段维护的优先次序,为维护活动经济性的决策提供依据,最终使管道的运行管理更加科学化。本文对油气管道风险评价现状及评价方法进行描述,并提出我国油气管道风险评价技术的对策。 相似文献
57.
Meeta Lavani Priyangshu M. Sarm Ajoy K. Man Simrita Cheem Banwari La 《环境科学学报(英文版)》2011,23(8):1394-1402
We compared the efficacy of a natural biocide with four chemical tetrakishydroxymethyl phosphonium sulfonate, benzyl trimethyl
ammonium chloride, and formaldehyde, glutaraldehyde, to control microbial induced corrosion in oil pipelines. The efficacy of biocides
were monitored against Desulfovibrio vulgaris and Desulfovibrio gigas in experimental pipes by measuring cell counts, H2S production,
Fe(II) production, production of extracellular polymeric substances and structure of biofilm. The treatment with cow urine had minimum
planktonic cell counts of 3 102 CFU/mL as well as biofilm cell counts of 9 101 CFU/mL as compared with tetrakishydroxyl methyl
phosphonium sulfonate, benzyl trimethyl ammonium chloride, formaldehyde and glutaraldehyde. Sulfide production was the lowest
with cow urine (0.08 mmol/L), followed by tetrakishydroxymethyl phosphonium sulfonate 0.72 mmol/L. On day 90 of treatment,
Fe(II) production was also found to be the lowest with cow urine. The scanning electron microscopic studies indicated that the biofilm
bacteria were killed by cow urine. These results demonstrate the cow urine mediated control of microbially induced corrosion, and this
is indicative of its potential as a viable substitute of toxic biocides. To the best of our knowledge, this seems to be the first report which
screens possible biocidal activity by cow urine as compared to the most common biocides which oil industry is currently using. 相似文献
58.
59.
主要介绍了中铝贵州分公司热电厂采用加拿大Cansolv公司再生胺在我厂锅炉烟气脱硫中的运用情况,存在问题,需要改进方面进行浅析,希望在同行业中具有一定的推广价值。 相似文献
60.
Fouling behavior along the length of membrane module was systematically investigated by performing simple modeling and lab-scale experiments of forward osmosis (FO) membrane process. The flux distribution model developed in this study showed a good agreement with experimental results, validating the robustness of the model. This model demonstrated, as expected, that the permeate flux decreased along the membrane channel due to decreasing osmotic pressure differential across the FO membrane. A series of fouling experiments were conducted under the draw and feed solutions at various recoveries simulated by the model. The simulated fouling experiments revealed that higher organic (alginate) fouling and thus more flux decline were observed at the last section of a membrane channel, as foulants in feed solution became more concentrated. Furthermore, the water flux in FO process declined more severely as the recovery increased due to more foulants transported to membrane surface with elevated solute concentrations at higher recovery, which created favorable solution environments for organic adsorption. The fouling reversibility also decreased at the last section of the membrane channel, suggesting that fouling distribution on FO membrane along the module should be carefully examined to improve overall cleaning efficiency. Lastly, it was found that such fouling distribution observed with co-current flow operation became less pronounced in counter- current flow operation of FO membrane process. 相似文献