全文获取类型
收费全文 | 101篇 |
免费 | 19篇 |
国内免费 | 16篇 |
专业分类
安全科学 | 25篇 |
废物处理 | 4篇 |
环保管理 | 8篇 |
综合类 | 72篇 |
基础理论 | 11篇 |
污染及防治 | 7篇 |
评价与监测 | 4篇 |
社会与环境 | 3篇 |
灾害及防治 | 2篇 |
出版年
2023年 | 1篇 |
2022年 | 5篇 |
2021年 | 11篇 |
2020年 | 2篇 |
2019年 | 6篇 |
2018年 | 6篇 |
2017年 | 8篇 |
2016年 | 12篇 |
2015年 | 4篇 |
2014年 | 6篇 |
2013年 | 12篇 |
2012年 | 14篇 |
2011年 | 5篇 |
2010年 | 5篇 |
2009年 | 2篇 |
2008年 | 2篇 |
2007年 | 7篇 |
2006年 | 9篇 |
2005年 | 2篇 |
2004年 | 2篇 |
2003年 | 3篇 |
2002年 | 3篇 |
2001年 | 1篇 |
2000年 | 1篇 |
1999年 | 2篇 |
1994年 | 2篇 |
1993年 | 1篇 |
1991年 | 1篇 |
1982年 | 1篇 |
排序方式: 共有136条查询结果,搜索用时 281 毫秒
81.
82.
83.
84.
Nelwyn T. Christie 《毒物与环境化学》2013,95(1-4):51-59
In this report we present several examples in which nickel(II) in combination with DNA damaging agents caused an enhanced or synergistic biological response using several different endpoints. These examples of Ni(II) toxicity represent several approaches designed to understand the genotoxicity of Ni(II) as well as several other metal ions. They are discussed in this report as a partial basis for our hypothesis that Ni(II) may alter the cellular processing of DNA damage at some common point in the pathway for DNA repair of several different agents. In cultured Chinese hamster cells DNA damage by Ni(II) ions was not readily demonstrated by the method of alkaline elution, but pretreatment of cells with Ni(II) before X‐irradiation produced an enhanced amount of strand breaks compared to the amount produced by X‐rays alone. A synergistic enhancement of cell transformation of Syrian hamster embryo cells was observed for combined treatments of Ni(II) and benzo(a)pyrene. The nickel enhancement of mutagenesis by ultraviolet light was demonstrated for the bacterial gene gpt stably integrated into the Chinese hamster V79 genome. 相似文献
85.
介绍了漏磁探伤设备在孤东采油厂管、杆修复检测中的应用现状,针对探伤检测中存在的问题,提出了相应的对策,提高了探伤检测效果。 相似文献
86.
梁政 《中国安全科学学报》2006,16(5):106-110
环焊缝就是一锥形环,可以建立其数学模型,进而证明了焊缝错边缺陷是可以修复的。通过应力计算分析和实验验证可以得出:当b/s较小(b/s<0.2)时,错边可以用磨削方法进行修复;当b/s较大时,可用堆焊方法进行修复,且堆焊宽度H不超过100mm。同时,在控制应力水平不超过1.5[σ]时,错边量和角变形量的和可以允许在不超过0.7s的范围内。研究及安全性评价表明ASME,GB150等标准对环焊缝的控制过于严格,也给压力容器制造企业增加了成本。因此,建议GB150放宽对B类焊缝错边量的控制要求。 相似文献
87.
Summary This study suggested that cell-cycle kinetics, DNA replication and DNA repair react to magnetic fields differently. During
their culture growth cycle, which lasted about five days, Friend erythroleukemia cells were either kept in the absence of
magnetic fields in a magnetically shielded room or irradiated in a solenoid with 70 μT at 50 Hz plus 45 μT DC of the Earth:
some cells grew without inducer of in vitro differentiation; others were induced to differentiate hemoglobin through dimethylsulfoxide. It emerged that, during a single
culture growth cycle, while proliferation was slightly accelerated by the magnetic-field irradiation achieved in the solenoid
both in undifferentiating and dimethylsulfoxide-differentiating cells, DNA replication did not appear to significantly depend
on the magnetic-field deprivation achieved in the magnetically shielded room. However, as a result of a 318-day long magnetic-field
irradiation in the solenoid, DNA replication remained unchanged in undifferentiating cells and partially inhibited in dimethylsulfoxide-differentiating
cells. Following the same long magnetic-field irradiation in the solenoid, the amount of labelled repair patches in the parental
DNA strands was slightly reduced. 相似文献
88.
89.
火灾后混凝土结构的评估与维修 总被引:1,自引:0,他引:1
本文详细介绍了火灾后混凝土结构的现场勘察、材料性能的检测方法.给出了通过收集火灾现场的有关资料对结构损伤进行判定的准则.并根据材料性质对损伤进行分类,提出了对于不同的损伤等级根据维修准则选择喷射混凝土、树脂维修、加覆层维修等不同的维修方法,通过维修可以保证结构的强度、稳定性、耐火性和外观特征. 相似文献
90.
微生物在重金属污染土壤修复中的作用研究 总被引:2,自引:0,他引:2
重金属污染土壤的修复是环境工程领域重要的研究方向,而利用微生物来修复重金属污染土壤具有很大的发展潜力.文中阐述了微生物在重金属污染土壤修复中的重要性并详细讨论了微生物修复的作用机理.介绍了生物表面活性剂及其生产菌株与化学表面活性剂相比所具有的优点及在修复污染土壤中的作用.总结了植物-微生物联合修复的特点并分析了植物与微生物之间的协同作用机理.为微生物应用于重金属污染土壤的修复提供理论基础与数据参考并对未来研究方向做了展望. 相似文献