油库的区域雷电灾害风险评估     

劳炜  植耀玲 《气象研究与应用》2012,33(3):77-80,86

根据因子分析法(指数法)对某油库进行了区域雷电灾害风险评估,探索了区域雷电灾害风险评估的方法,得出了科学合理的结论。  相似文献   

Review on Researches of Legacy POPs and Emerging POPs in the Arctic Regions   总被引：3，自引：0，他引：3  

Lao Qibin  Jiao Liping  Chen Fajin  Chen Liqi 《地球科学进展》2017,32(2):128-138

The specific geographic location and natural conditions of the Arctic region play a significant role in the global climate change. As a result of perennial low temperature, simple ecological structure, and fragile ecosystem and weak stability in the Arctic, Persistent Organic Pollutants (POPs) accumulating from the region of middle and low latitudes may cause tremendous pressure in the arctic ecological environment. Therefore, the research of POPs in the Arctic region is not only conducive to more in-depth understanding of POPs distribution and transformation process in the global range, but to reasonably assess the harm of human activities on the arctic ecological environment. Thus, in the past 40 years, especially after nine new kinds of emerging organic contaminants being added to the list of Stockholm Convention in 2009, more and more scientific community and general public have pay attention to the research of POPs in the Arctic region. At present, the understanding of legacy POPs in the Arctic is limited, and the research of emerging POPs is in the initial stage. This paper aimed to summarize some conclusions and implications of the research, and focused on the occurrence level, historical evolution, bioaccumulation and source of POPs in atmosphere, waters, sediments and organisms in the Arctic region. Finally, the future changes and key scientific problems of POPs in the Arctic region were proposed.  相似文献   

芦潮港车客渡码头水域近期强势淤涨原因辨析     

贺松林  劳治声 《海洋学研究》1999,17(1):13-19

叙述了１９９３年前的芦潮港车客渡码头水域自然水深条件和１９９３年后强烈淤涨的态势,从诸事件的时间之窗及水下滩坡适应性调整、长丁坝促淤效应等方面讨论了该水域强势淤涨的原因,提供了一个海岸工程产生淤积响应的典型实例。海岸带（尤其在沉积环境响应敏感的区域）开发必须注重社会经济效益与环境效益的统一。  相似文献   

工业用地转型下地理想象与地方意义构建 ——广州广钢新城案例     

张隆龙  劳颖宜  程国宇  王敏 《热带地理》2019,39(1):99-107

在城市化进程中工业用地转型背景下,选择广钢新城为案例进行实证分析,从地理想象的视角,探讨周边村民、旧广钢职工以及新进入者等主体对广钢新城地方意义和文化内涵进行解构和重构的过程,并进一步解析地方建构与身份认同的联系。研究发现：1）由于主观性和空间实践体验的差异,不同社会群体对于广钢的地方意义有着截然不同的想象;2）周边村民、广钢旧厂职工集体记忆的嬗变,反映了空间形态、社会结构变化与在地群体的想象构建以及身份认同的耦合关系;3）新进入者的地方身份认同建立在排除在地群体的地方文化想象之上,二者对于广钢新城的地方意义和身份认同是断裂的,2个社会群体对于地方意义的感知与认同在未来还需要进一步的交流与融合;4）在社会话语构建的文化冲击以及权力和资本的支配下,外界群体逐渐产生对广钢新城地方文化意义的多元想象。广钢片区的大规模空间重塑以及由此衍生的地方意义重构说明经济、社会和文化因素对地方建构具有直接而深刻的影响。  相似文献   

Research on Wide-field Imaging Techniques for Low-frequency Radio Arraytwo     

Lao Bao-qiang  An Tao  Chen Xiao  Wu Xiao-cong  Lu Yang 《Chinese Astronomy and Astrophysics》2018,42(4):626-651

Wide-field imaging of low-frequency radio telescopes is subject to a number of difficult problems. One particularly pernicious problem is the non-coplanar baseline effect. It will lead to distortion of the final image when the phase of $w$-direction called $w$-term is ignored. The image degradation effects are amplified for the telescopes with a wide field of view. This paper summarizes and analyzes several $w$-term correction methods and their technical principles. Their advantages and disadvantages are analyzed after comparing their computational cost and computational complexity. We conduct simulations with two of these methods, i.e., faceting and $w$-projection, based on the configuration of the first-phase Square Kilometre Array (SKA) low-frequency array. The resulted images are also compared with the result of the two-dimensional Fourier transform method. The results show that the image quality and correctness derived from both faceting and $w$-projection are better than the two-dimensional Fourier transform method in wide-field imaging. The effects of the number of facets and the $w$-direction step length on the image quality and running time are evaluated. The results indicate that the number of facets and the $w$-direction step length must be reasonable. Finally, we analyze the effect of data size on the running times of the faceting and $w$-projection algorithms. The results show that the faceting and $w$-projection algorithms need to be optimized before the huge amount of data processing. The research of the present paper initiates the analysis of wide-field imaging techniques and their applications in the existing and future low-frequency arrays, and will foster their applications in even broader fields.  相似文献   

生油岩矿物低温催化脂肪酸脱羧生烃的活性评价   总被引：9，自引：2，他引：7  

张在龙  孙燕华 《地球化学》1999,28(6):589-595

在地质低温条件下,未熟生油岩矿物催化脂肪酸脱羧生烃反应生成的ＣＯ２含量很低,因此,通过金属镍催化剂将ＣＯ２转化为ＣＨ４后再用氢离子火焰检测器检测其含量,以提高检测的灵敏度。运用该方法评价了我国七个油田未熟生油岩矿物催化脂肪酸脱羧生烃活性实验结果表明,脂肪酸在未熟生油岩矿物低温催估作用下,其脱羧率与未熟生油岩矿物中的碳酸盐及过渡金属Ｆｅ元素的含量有关。  相似文献   

1997年9月三水地震震相特征与发震构造   总被引：2，自引：0，他引：2  

李纯清  梁劳 《华南地震》1998,18(1):130-134

１９９７年９月广东省三水市发生的ＭＬ３．７、４．４级地震因震中烈度比同等震级的其它震例偏高许多,而且多个台站均记录到长周期振动规则的正弦形面波而特别引人注目。精确测定了这组地震的震源位置,得到震源深度约等于１ｋｍ;对比分析了震相记录特征、震区周围的历史地震活动及地质构造背景,认为这是一组罕见的低震级高烈度震例,其发生可能与震中附近的Ｆ７断层活动有关。  相似文献   

澳门沿海的底栖贝类     

蔡英亚  劳赞 《广东海洋大学学报》2001,21(3):10-12

报道了澳门沿海底栖贝类56种,隶属40属27科3纲,并对主要可发展养殖的经济贝类作了介绍.  相似文献   

某烟花爆竹仓库的雷电灾害风险评估     

劳炜  黄伟圣  覃蕾  邓少新 《气象研究与应用》2011,32(4):87-89

根据对田东县某烟花爆竹仓库的设计方案进行雷电灾害风险评估,在确保人员生命损失风险值满足国家有关规定的容许值的前提下,通过防雷装置成本效益估算,改进了原设计方案中经济不合理的设计。也通过雷电灾害风险评估对烟花爆竹仓库的防雷设计提出了一些建议和思考。  相似文献   

Catalytic decarboxylations of fatty acids in immature oil source rocks     

李哲  张再龙  孙燕华  劳永新  蔺五正  吴卫芳 《中国科学D辑(英文版)》2003,46(12):1250-1260

More attention has been paid to the formation conditions of petroleum and gas[1,2]. It is gen-erally accepted that various types of organic materials have served as the most important source of petroleum and gas in sediments. The formation of hydrocarbons…  相似文献