千岛群岛大地震与中国东北地区地震相关性的探讨     

蔡宏雷  朴杰  陈琳荣  赵海源  郑国栋  张宇  周忠伟 《地震地磁观测与研究》2011,32(1):15-19

在分析3次千岛群岛大地震对应东北地区地震的基础上,讨论了在地质构造背景下千岛群岛大地震引起板块俯冲与我国东北地区地震的相关性.结果表明,千岛群岛发生7级以上地震对应东北地区地震有较强相关性;千岛群岛在大地震破裂过程中产生的俯冲作用自东向西对东北板块产生挤压作用,东北地震区相继发生了浅源地震;千岛群岛地区发生地震时,东北...  相似文献   

水管倾斜仪观测干扰分析及维护     

韩忠民  朴杰  金正燮  李承雪 《地震地磁观测与研究》2011,32(3):109-113

阐述延边地震台形变观测站水管倾斜仪观测常见干扰及仪器维护经验.通过对非映震干扰因素的进一步认识,提高前兆数字化观测数据分析预报水平,并为今后的仪器维护提供经验.  相似文献   

Numerical Study of Gas Production from a Methane Hydrate Reservoir Using Depressurization with Multi-wells     

SHANG Shilong  GU Lijuan  LU Hailong 《《地质学报》英文版》2021,95(3):928-936

With the implementation of the production tests in permafrost and offshore regions in Canada, US, Japan, and China, the study of natural gas hydrate has progressed into the stage of technology development for industrial exploitation. The depressurization method is considered as a better strategy to produce gas from hydrate reservoirs based on production tests and laboratory experiments. Multi-well production is proposed to improve gas production efficiency, to meet the requirement for industrial production. For evaluating the applicability of multi-well production to hydrate exploitation, a 2D model is established, with numerical simulations of the performance of the multi-well pattern carried out. To understand the dissociation behavior of gas hydrate, the pressure and temperature distributions in the hydrate reservoir are specified, and the change in permeability of reservoir sediments is investigated. The results obtained indicate that multi-well production can improve the well connectivity, accelerate hydrate dissociation, enhance gas production rate and reduce water production as compared with single-well production.  相似文献   

Process Performance of a Biotrickling Filter Using a Flow‐Directional‐Switching Method     

Liping Wang  Shilong He  Jiangcen Xu  Jie Li  Zhen Mao 《洁净——土壤、空气、水》2013,41(6):522-527

Non‐uniform distribution of biomass and the accumulation of excess biomass at the inlet of a unidirectional flow biotrickling filter (UF‐BTF) may lead to severe operating problems including increasing airflow resistance in packed bed, clogging, and low contaminant removal efficiencies, even performance loss. Therefore, a flow‐directional‐switching biotrickling filter (FDS‐BTF) was designed to improve performance such as the maximum elimination capacity and elimination efficiency. Toluene was chosen as the unique carbon source for microorganism. The results indicated that the purification performance of FDS‐BTF was superior to UF‐BTF. The maximum elimination capacity of FDS‐BTF was up to 480 g/(m³ h), which was 17.1% higher than that of UF‐BTF. After a 50‐day continuous operation, FDS‐BTF attained the stable purification performance and the outlet concentrations of toluene could meet the emission standard with inlet concentrations ranging from 720 to 1100 mg/m³ for an empty bed residence time (EBRT) of 23.9 s. The average well color development in FDS‐BTF was higher than that in UF‐BTF. It indicated that FDS‐BTF could improve the metabolic activity, which may improve the uniform distribution of biomass along the length of packed bed. When two systems were shut down, 24 and 48 h, respectively, the time that FDS‐BTF and UF‐BTF needed to restore the former elimination efficiency after a shut down of 48 h were 3–4 and 9–10 h. These data indicated that the purification performance of FDS‐BTF was superior to UF‐BTF.  相似文献   

利用接收函数研究延边地震台下方地壳结构     

朴杰  李承雪  孔婧  韩忠民  金正燮 《地震地磁观测与研究》2014,35(5):76-78

收集整理2007年以来延边地震台记录的113个远震数字波形资料,采用远震接收函数反演延边地震台下方地壳结构,运用H-Kappa叠加方法,计算得到台站下方地壳厚度和泊松比.采用全球平均地壳模型作为初始模型,反演台站下方0-100 km的S波速结构.反演结果表明,延边地震台下方地壳厚度为30.8 km,波速比为1.84,泊松比较高,为0.29.在台站下方15-20 km及25-30 km处存在低速层.  相似文献   

基于自动站资料的灰霾观测判据研讨   总被引：3，自引：2，他引：1  

宋文英  梅士龙  孙华 《气象科学》2012,32(1):74-79

针对当前有较大争议的灰霾观测中两个判据(能见度和相对湿度)的阈值选取问题,对嘉兴市2007—2009年人工观测灰霾记录,观测站能见度自动仪及相对湿度等资料以及2007—2009年环保部门空气污染指数、周边地市霾日进行了对比分析,对人工观测灰霾日数的合理性进行探讨;并进一步根据同年份能见度自动仪资料及相对湿度自动站资料,调试不同的阈值,将得出的灰霾天数与人工观测值再次进行对比,最终提出一个适用于本地实际的灰霾日观测判据,并指出经过订正后的自动站资料可替代人工观测值用于霾雾的辨析。  相似文献   

瞬态面波在老路路况评价中的试验研究          下载免费PDF全文

朱友群  施斌  朴春德  何淼  徐宏  高磊 《水文地质工程地质》2009,36(2):85-89

通过改进传感器型式,综合利用基阶模态和高阶模态频散数据正反演老路随深度方向面波速率,对比养护资料及钻探试验,建立了面波波速与老路压实度、标准贯入击数统计关系。试验结果表明:上硬下软道路结构频散数据求解需同时提取基阶模态和高阶模态信息,基阶模态特征反映下部低速层物性参数,高阶模态反映上部高速层物性参数,加权分层面波波速与压实度、标准贯入击数有较好的相关性。该试验结果适用于沪宁高速公路老路路况的评价。  相似文献   

The preference of nitrate uptake in Chinese prickly ash estimated by δ<Superscript>15</Superscript>N values and cation concentrations     

He-Chun Piao  Si-Liang Li  Shi-Jie Wang  She-Hong Li 《Environmental Earth Sciences》2017,76(2):87

The nitrogen isotopic compositions of plant tissue could reflect its uptake of and preference for ammonium or nitrate. However, various factors may influence the field-collected δ¹⁵N values under field condition, which causes the interpretation problematic. The spatial variation of nitrogen (N) concentrations and the isotopic compositions were investigated in the soils and tissues of Chinese prickly ash from the southwest China to the east China. The objectives were to investigate the variation in soil and tissue δ¹⁵N values and N forms taken up by the plant. The leaf and root δ¹⁵N values varied significantly in response to the pattern of soil δ¹⁵N values. The difference in δ¹⁵N values between the leaves and roots was 2.57‰ and may be caused by an increase in the transport of unassimilated \( {\text{NO}}_{3}^{ - } \) and \( {\text{NH}}_{4}^{ + } \) to the leaves. Leaf nitrogen was significantly and positively correlated with leaf potassium and negatively related to leaf calcium. Because potassium is the favoured counter-cation for nitrate transport in the xylem, the enrichment of ¹⁵N in leaf relative to root induced by preferenced uptake of nitrate should be accompanied by significant and positive relationship of leaf nitrogen with leaf potassium concentrations. These results suggest that Chinese prickly ash prefers \( {\text{NO}}_{3}^{ - } \) over \( {\text{NH}}_{4}^{ + } \).  相似文献   

喀斯特生态系统生物地球化学过程与物质循环研究:重要性、现状与趋势   总被引：9，自引：0，他引：9       下载免费PDF全文

刘丛强  郎赟超  李思亮  朴何春  涂成龙  刘涛泽  张伟  朱书法 《地学前缘》2009,16(6):1

喀斯特地质与生态系统是地球表层系统中的重要组成部分,其变化将对其他地区以及整个地球系统产生影响.生物地球化学循环是全球和区域变化研究的核心内容,而生态系统的演化与系统内水分和养分的生物地球化学循环密切相关。因此,我们有必要将喀斯特生态系统纳入到更大区域或全球生态系统中进行分析研究,在充分研究认识整个喀斯特生态系统物质生物地球化学循环规律的基础上,进一步研究喀斯特生态系统的全球变化响应或影响机制,为喀斯特生态系统优化调控对策和措施提供科学基础。研究生态系统演化过程中物质的生物地球化学循环规律,是研究植物适生性、物种优化配置和适应性生态系统调控机理的关键基础。在介绍前人工作基础的同时,本文全面而概括地总结了我们近年利用元素、同位素(如δ13C、δ15N、δ34S、87Sr/86Sr)示踪和化学计量学理论和方法对喀斯特生态系统中不同界面和流域中物质的生物地球化学循环及其生态环境效应的研究成果。认识到:喀斯特流域生物地球化学循环活跃,相互耦合,并与流域生态环境变化相互制约;人类活动正干预流域物质的自然生物地球化学循环过程,并导致相应的生态和环境效应;全球变化科学深化有赖于区域生态环境变化及物质生物地球化学循环的研究。这些认识是我们将来系统深入开展喀斯特以及其他流域生态系统物质生物地球化学循环研究的重要方向。  相似文献   

Cambrian Sequence Stratigraphy and Sea Level Cycles of North China Platform     

Shi Xiaoying Mei Shilong Chen Jianqiang Yang Xinde Department of Geology  Mineral Resources  China University of Geosciences  Beijing 《中国地质大学学报(英文版)》1999,10(2)

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