Assessing the impact of pollution on aquatic systems at a global and regional level     

Mee LD  Bloxham M 《Marine environmental research》2002,54(3-5):223-228

In developing a methodology for the ongoing Global International Waters Assessment, major gaps have become apparent in our ability to make comparative assessments of pollution. A pragmatic impacts scoping methodology has been developed and tested. A more effective assessment protocol however, requires a better knowledge of the relationship between pollution sources and biological effects with less reliance on chemical monitoring.  相似文献   

矽卡岩矿床中的金和银     

Mein.  LD 李永明 《冶金地质动态》1990,(2):19-21

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煤矿井下随采地震探测技术发展综述     

程建远  覃思  陆斌  王保利  王季  王云宏 《煤田地质与勘探》2019,47(3):1-9

煤矿井下地震勘探的炸药震源受火工品管控影响大,且无法实现煤矿开采动力地质灾害的监测预警;随采地震是以采煤机为震源的地震探测新技术。本文回顾了国内外随采地震技术的研究现状,介绍了随采地震的方法原理和独特优势,并开展了一些先导性的试验研究利用。结果表明:采煤机震源具有激发能量强、频带宽、安全绿色经济、可重复等特点,可以作为随采地震探测的被动震源;采煤机震源与炸药震源的地震炮集记录接近,后者单炮信噪比相对较高;随采地震数值模拟、大数据动态处理等关键技术急需协同攻关。尽管随采地震尚处于试验研究阶段,但是它将成为未来透明工作面三维动态地质建模、开采动力地质灾害监测预警等重要手段,代表了今后煤矿智能探测技术的发展方向。   相似文献   

基于孔间地震细分动态探测的透明工作面方法     

陆斌 《煤田地质与勘探》2019,47(3):10-14

透明工作面是煤矿智能开采的重要组成部分,为智能开采提供工作面的详细地质构造信息,提出一种基于孔间地震密集动态探测的透明工作面方法,能够实现工作面的渐进式精细探测。该方法是以采煤机为震源的随采地震方法的进一步发展,主要利用平行于切眼的一系列水平孔对工作面进行细分探测,随着采煤工作的逐渐推进,利用孔间地震方法对细分区域进行精细成像。与已有的随采地震方法比较,本方法具有明显的优点。首先,射线覆盖更加均匀且无盲区。第二,探测区域被细分所以探测精度更高。第三,因为利用地震干涉的"虚"震源方法能得到高信噪比的单炮,可进一步提高探测精度。该方法能够适应智能开采透明工作面的目标要求,有望成为智能开采的重要组成部分。   相似文献   

Interrupting a multi-species bioinvasion vector: the efficacy of in-water cleaning for removing biofouling on obsolete vessels     

Davidson IC  McCann LD  Sytsma MD  Ruiz GM 《Marine pollution bulletin》2008,56(9):1538-1544

Vector management is the primary method for reducing and preventing nonindigenous species (NIS) invasions and their ecological and economic consequences. This study was the first to examine the efficacy of in-water scrubbing using a submersible cleaning and maintenance platform (SCAMP) to prevent invertebrate species transfers from a heavily fouled obsolete vessel. Initially, prior to treatment, 37 species were recorded in a biofouling matrix that reached 30cm depth in some locations. The bryozoan Conopeum chesapeakensis, and bivalves Mytilopsis leucophaeata and Ischadium recurvum, were dominant sessile species that created structure, supporting mobile biota that included crabs and the associated parasitic barnacle Loxothylacus panopae. Scrubbing had the effect of significantly reducing organism extent and the number of species per sample, but a substantial and diverse (30 species) residual fouling community remained across the entire vessel. Further assessments of management options are needed to prevent potentially damaging NIS transfers. Additional measures taken within an integrated vector management (IVM) strategy may further improve invasion prevention measures.  相似文献   

基于STA/LTA方法的微地震事件自动识别技术     

段建华  程建远  王云宏  陆斌  朱红娟 《煤田地质与勘探》2015,43(1):76

快速准确地从微震监测数据中提取微地震事件是微地震监测技术的关键。采用理论模拟数据分析了STA/LTA方法的可行性,选择了更能反映微地震信号变化的特征函数代替原始信号,结合实际数据对时窗长度、长短时窗比、阈值等重要参数进行了对比分析。研究结果表明,STA/LTA方法能够从海量微地震监测数据中快速准确地自动识别微地震有效信号,去除冗余信息,大幅减少微地震监测数据的传输量,从而为微地震监测数据的无线实时传输提供了可能,同时也减少了数据存储所需要的磁盘空间,取得了较好的应用效果。   相似文献   

龙滩库区蓄水后地震性质分析   总被引：2，自引：0，他引：2  

史水平  于学庆  龙政强  蒙陆斌  黄树生 《地震地磁观测与研究》2010,31(3):40-45

龙滩水库2006年10月蓄水以来,库区地震活动频繁,这可能是原有构造地震的进一步活动,也可能是水库诱发地震。因此,有必要对龙滩水库蓄水后发生的地震性质进行判断。本文根据国内外已发生水库诱发地震震例资料和以往经验,结合龙滩库区具体情况,利用定性判断法和概率统计法对龙滩库区地震性质进行验证和判断,结果认为:龙滩库区蓄水后发生的地震属诱发地震。  相似文献   

Trace metal retention in mangrove ecosystems in Guanabara Bay,SE Brazil   总被引：1，自引：0，他引：1  

Machado W  Silva-Filho EV  Oliveira RR  Lacerda LD 《Marine pollution bulletin》2002,44(11):1277-1280

Along contrasting environmental conditions (e.g., degree of trace metal contamination and mangrove forest structural development), sediments of Laguncularia racemosa-dominated mangrove stands in Guanabara Bay (SE Brazil) presented a trend of trace metal accumulation in forms with low potential of remobilization and biotic uptake. Concurrently, a relatively low transfer of sediment-bound metals to L. racemosa leaves was observed, which may moderate the metal export from the forests via leaf litter transport and the metal availability to enter in food chains based on leaf consumption.  相似文献   

Persistent organochlorine residues in sediments from the Black Sea   总被引：6，自引：0，他引：6  

Fillmann G  Readman JW  Tolosa I  Bartocci J  Villeneuve JP  Cattini C  Mee LD 《Marine pollution bulletin》2002,44(2):122-133

The extent of contamination of the Black Sea by selected organochlorine compounds has been assessed through the analysis of surficial sediments taken from throughout the region. Concentrations of HCHs at sites influenced by the Danube delta are among the highest recorded on a global basis (up to 40 ng g(-1) dry wt). The ratio between the alpha- and gamma-isomers was relatively low indicating contamination through the use of lindane. Concentrations of DDTs (0.06-72 ng g(-1) dry wt) and PCBs (0.06-72 ng g(-1) dry wt) were not especially high in comparison to levels reported from throughout the world. The DDE/DDT ratio was, however, low indicating fresh inputs and hence current usage of DDT within the Black Sea region.  相似文献   

一种基于数字信号处理的无线通信接收机     

陆斌  李正茂 《成都气象学院学报》1994,9(1):24-29

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