夏季对马暖流区黑潮水与陆架水的相互作用──兼论对马暖流的起源   总被引：16，自引：4，他引：12  

郭炳火  李兴宰  李载学 《海洋学报》1998,20(5):1-12

根据1994年8月28日至9月7日韩国“Onnuri”号海洋调查船获得的CTD资料及在调查期间投放的11个卫星跟踪漂流浮标资料,分析研究了东海东北部黑潮水的分离及其与陆架水的相互作用,进而探讨了夏季的对马暖流的形成过程。  相似文献   

Fully-implicit simulation of vertical-equilibrium models with hysteresis and capillary fringe     

Halvor Møll Nilsen  Knut-Andreas Lie  Odd Andersen 《Computational Geosciences》2016,20(1):49-67

Geological carbon storage represents a new and substantial challenge for the subsurface geosciences. To increase understanding and make good engineering decisions, containment processes and large-scale storage operations must be simulated in a thousand year perspective. A hierarchy of models of increasing computational complexity for analysis and simulation of large-scale CO₂ storage has been implemented as a separate module of the open-source Matlab Reservoir Simulation Toolbox (MRST). This paper describes a general family of two-scale models available in this module. The models consist of two-dimensional flow equations formulated in terms of effective quantities obtained from hydrostatic reconstructions of vertical pressure and saturation distributions. The corresponding formulation is fully implicit and is the first to give a mass-conservative treatment and include general (non-linearized) CO₂ properties. In particular, the models account for compressibility, dissolution, and hysteresis effects in the fine-scale capillary and relative permeability functions and can be used to accurately and efficiently study the combined large-scale and long-term effects of structural, residual, and solubility trapping.  相似文献   

武钢使用配煤组成与胶质层粘结系数关系     

许传智  郑烈 《矿物岩石地球化学通报》1999,(4)

近几年来,随着钢铁业的发展,工业用煤需求量愈来愈大,但煤质波动较大,致使炼焦质量在同一配比条件之下的配煤也产生不同程度的差异,使焦炭质量明显下降,其Ｍ４０为７６％～７８％,Ｍ１０为８－４％～９－０％。而焦炭的热稳定性,则是导致高炉高产顺行的主要因素之一。目前,武钢高炉碱负荷大约为７～８ｋｇｔ铁,如此高的碱负荷条件下焦炭在高炉中的热稳定性势必受其干扰。十多年来,我们在试验室及跟踪生产研究表明,焦炭在无碱或低碱（＜２ｋｇｔ铁）害的高炉中,焦炭热强度有明显差异。武钢目前生产所用焦炭,在无碱害、１１…  相似文献   

Soil respiratory and enzyme activities in leachate-contaminated soils with different application rate of cow manure compost: a laboratory study     

Lie Yang  Zhulei Chen  Ting Liu  Juan Jiang  Beitao Li  Si Chen  Jun Zhang 《Environmental Earth Sciences》2014,71(1):225-231

The experiment was conducted to evaluate the effects of cow manure compost (CMC) application on respiratory and enzyme activities of leachate-polluted soils. Soils treated with various levels of leachate (0, 12.5, 25, 37.5, and 50 ml leachate per 300 g soil) were amended with 0, 25 and 50 g CMC, respectively. Soil pH, respiration and enzyme activities were evaluated by regularly repeated sampling. Addition of CMC neutralized pH and maintained it within the range of 6.4–6.7 in a long run. Respiration was increased neither by leachate nor by CMC. This probably results from deterioration of soil compaction, biotoxicity of leachate, or increased fungi proportion. Enzyme activities increased with increasing CMC application but decoupled with leachate addition rate, reasonably attributed to pH neutralization and high content of humus in CMC. Thus, pH value and humus content could be considered as key items affecting soil enzyme activities.  相似文献   

Probabilistic development of shear strength model for reinforced concrete squat walls          下载免费PDF全文

Chao‐Lie Ning  Bing Li 《地震工程与结构动力学》2017,46(6):877-897

In order to reconcile the larger scatter and avoid the biased estimate from deterministic predictions for the shear strength of reinforced concrete (RC) squat structural walls, a probabilistic shear strength model is developed in this paper based on the strut‐and‐tie model and the generalized likelihood uncertainty estimation (GLUE) method. The strut‐and‐tie model is used to derive an appropriate function form for the probabilistic shear strength model, where four unknown model parameters (e.g. k₁, k₂, k₃ and k₄) are defined carefully to guarantee them having a clear physical‐based meaning so that the corresponding prior distribution ranges can be specified reasonably. Then, the GLUE method is adopted to estimate the posterior cumulative distribution of k₁, k₂, k₃ and k₄ with an available experimental database. Furthermore, to demonstrate the stability of the estimated posterior cumulative distribution, the sensitivity of three major aspects in GLUE method is investigated. Finally, based on the estimated cumulative distribution of k₁, k₂, k₃ and k₄, the developed probabilistic shear strength model is simplified as a mean prediction model and a standard deviation prediction model for facilitate using in engineering practice. Therefore, with the developed probabilistic shear strength model, not only can the squat structural walls be designed in confidence, but the accuracy of those deterministic predictions can be evaluated in a probabilistic manner. Copyright © 2016 John Wiley & Sons, Ltd.  相似文献   

近40年来中国降水量、雨日变化趋势及与全球温度变化的关系   总被引：26，自引：10，他引：26  

王大钧  陈列  丁裕国 《热带气象学报》2006,22(3):283-289

近40年来中国降水量的空间分布与相应时段的雨日数空间分布较一致;年降水量变化趋势主要呈现东北-西南向“＋、-、＋”分布型,其中以西部地区和长江三角洲的增加和华北及川东地区的减少趋势更加显著.对季降水来说,除了冬季降水量场表现为绝大部分地区为正趋势外,其它三季变化都较复杂;绝大部分地区年雨日数的趋势系数是负值,就是说雨日数总的趋势是减少的,全国范围内秋季雨日数明显呈现减少的趋势;夏季强降水日的平均频数介于0～11之间,最大值位于西南地区的西部,最小值则位于南疆地区;无论是降水量场还是雨日数场都与全球温度距平存在显著相关,只是后者的显著性水平高于前者.  相似文献   

Corrosion of rebar in concrete and its prevention          下载免费PDF全文

LIU Xue-qing  CHEN Lie  HOU Bao-rong 《海洋科学》2008,32(10)

  相似文献   

GeoMUST技术及其在提高地震资料信噪比和分辨率中的应用     

李列  李添才  葛勇  张兴岩  丘斌煌  王新领 《地质科技情报》2013,(3):188-192

地震勘探方法中的信噪比和分辨率是矛盾的对立统一体,常规地震资料处理流程很难在提高信噪比的同时提高分辨率,本文基于中国近海某工区数据,提出一种新的处理技术,在地质导向下采用多种方法将提高信噪比和提高分辨率分开进行处理,在处理的过程中互不干扰;再采用最优加权叠加技术将多处理流程得到的各自结果叠加起来,该技术简称为GeoMUST技术。合成记录处理试算和实际资料处理结果表明该技术可以兼顾信噪比和分辨率以及保真度。  相似文献   

串联SRME在涠西南地区多次波衰减中的应用     

史文英  李列  袁全社  邓勇  张兴岩 《物探与化探》2013,(5):911-915

在浅水区域的海洋地震勘探中,海底与水面波阻抗差异较大,形成了大量的短周期海底多次波（鸣震）及微屈多次波,严重影响了地震资料的真实性与可靠性,此类多次波一般采用自由地表相关多次波压制（SRME）;涠西南某工区由于基底较浅且与老地层波阻抗差异较大,所以除海面与海底外存在第三个多次波源,尤其在基底处产生的海底微屈多次波,离基底较近,很容易被误认为是基底,此类多次波采用传统的SRME方法无法有效压制,笔者采用基于波动方程模型与褶积模型串联SRME对其进行压制,实际资料处理结果显示该方法对多次波压制效果较为明显。  相似文献   

结合密集连接和特征重标定的高分影像分类方法     

吴列  齐华  郎垚  南轲 《地理信息世界》2022,29(1):63-68,74

现有的基于深度学习的面向对象分类方法存在特征表达不充分,难以处理蕴含复杂信息的高分辨率遥感影像等问题.为了实现高分辨率遥感影像高精度分类目的 ,本文提出了一种结合密集连接和特征重标定的影像分类方法.首先构建具有密集连接方式的DenseNet网络作为基础网络,密集连接的方式能实现每一层输入都是前面所有层信息的汇总;然后引...  相似文献