风险预探井哈深斜1井钻井工程设计

哈深斜1井是胜利油田部署的一口重点风险预探井,该井为双靶点定向井,具有井斜角大、稳斜段长、水平位移大的特点。作为风险预探井,可借鉴的邻井实钻资料少,地层岩性、地层压力及层段变化不确定性因素相对较大,确定合理的井身结构、轨道类型、钻井液性能以及相关配套工艺措施是保证该井顺利施工的基础。在对有限的邻井资料进行详细分析的基础上,总结出本井钻井工程设计的技术难点,并有针对性的从井眼轨道设计、井身结构设计、钻具组合及钻井方式选择、钻井液设计和固井设计5个方面提出优化方案及技术措施,为胜利油田风险预探井的设计与施工提供了技术支持和理论依据。     

MODFLOW的可视化开发

本文简要介绍了利用面向对象技术,对ＭＯＤＦＬＯＷ进行可视化开发的基本思想、设计框架,并讨论了ＶＢ语言中的实现。对采用的类结构、批处理调用及结果数据解读等关键性问题作了较为详尽的说明。该方法对其它数据复杂的ＤＯＳ程序同样适用     

Impact of anthropogenic geochemical change and aquifer geology on groundwater phosphorus concentrations

Geologic and geochemical variations across a 4200 km² area of south-central Wisconsin (USA) were used to examine their relationship to phosphorus concentrations in groundwater from more than four hundred private water supply wells. Surficial geology in the study area ranged from Cambrian sandstones to Ordovician dolomites. Groundwater phosphorus concentrations were higher in aquifers of older Cambrian age compared to the concentrations in aquifers of younger Cambrian and Ordovician age. Because iron concentrations were relatively low in these waters and agricultural land use was similar in all geologic regions, we propose that the differences in bedrock phosphorus and anthropogenic geochemical impacts explain the differences in phosphorus concentrations between aquifers. Within the older Cambrian aquifers, groundwater phosphorus concentrations were elevated in groundwater with higher nitrate-nitrogen concentrations. This finding is consistent with the presence of phosphorus within sediment in these strata and geologic conditions that weakly buffered pH reduction from anthropogenic acidification. In contrast, groundwater phosphorus concentrations in younger Cambrian and Ordovician aquifers were not elevated in samples with higher nitrate. Anthropogenic acidification in these carbonate-rich aquifers was neutralized through increased carbonate weathering, which led to higher groundwater calcium and alkalinity and would limit the dissolution of phosphate-rich minerals, such as apatite, where present. Low iron concentrations observed in most samples suggest that the phosphorus release in the Cambrian strata occurs beyond the zone of secondary mineral retention in the soil. These results have important implications for the eutrophication of inland surface waters in areas with bedrock phosphorus and anthropogenic acidity that is not neutralized before it contacts phosphatic rock.     

处理大型数据时内存不足的解决办法

本文给出了处理大型数据时内存不足的五种解决方法：即：（１）尽可能空闲基本内存;（２）利用覆盖技术;（３）利用虚拟存储技术;（４）利用一些编译程度;（５）利用ｈｕｇｅ指针。     

基坑土钉支护辅助设计计算研究——利用VISUAL BASIC语言编程

利用VISUAL BASIC语言编制的基坑土钉支护程序，计算并绘出最危险滑动面，实现自动选择合理的基坑支护参数，提供土坡稳定性、抗滑、抗倾覆安全系数和抗拔试验的相关力学参数。经过邯郸信华大厦基坑支护设计的成功应用，证明这种方法能满足工程设计和施工的要求。程序具有通用性、准确性、实用性等特点。     

国际大洋钻探计划研究方向与钻探目标

从地球环境动力学和地球内部动力学2个方面介绍国际大洋钻探计划研究方向与钻探目标,前者主要试图了解地球气候变化历史与规律、海平面变化的原因与影响以及通过沉积物、液体和细菌等研究了解全球碳循环、气水合物形成和深海生物资源等重要问题;后者主要试图探测地球深部热与物质的转换、调查岩石圈变形与地震形成过程.同时,也介绍了ODP提出的3个挑战性项目,即自然气候变化和气候剧变原因、地质过程的现场监测和大陆边缘与洋壳深部结构探测.     

The Local Tsunami Alert System [``SLAT']: A Computational Tool for the Integral Management of a Tsunami Emergency

During a tsunami emergency numerous local authorities responsible for the security oflocal persons and businesses which function in the coastal zone are required to makecritical decisions within a very short time frame. It is known that the consequencesof the situation will depend on the quality and quantity of decisions which they makeor allow to occur at the critical time. Based on this concept, the Local System of Tsunami Alert (SLAT; Spanish) was developed. This is a computational tool designed for the automatic implementation of integral management for an emergency of this type.The System is able to immediately evaluate possible risks and determine thetype of alert represented (Red, Yellow, Green, Blue, and Celeste) if relevantdata such as coordinates of the epicenter, magnitude, date, and origin of theearthquake (>6.5° on the Richter scale) threatening the Pacific areknown. Other relevant data include location of the coastal or marine epicentreand the superficial hypocenter. The relevant data may now be obtained fromthe internet from international seismological services, and fed into the programto give the most probable time for arrival of the first wave train at a given pointof interest, whether this be a port, bathing area, generating plant, or coastal city.The program also gives the time required for the first wave train to arrive at agiven coast, and displays a menu of previously planned actions to be taken accordingto the type of alert. It also permits dissemination of a bulletin with critical data and action plans by fax or e-mail to scattered users as well as for storage on the computer disc. The system is designed in a way that the user always confirms with authorities that anevent has in fact been generated. On a local scale, the user is required to prepare an operative emergency plan of action to be followed by his company, community, or municipality, to be followed for each type of alert.The System permits carrying out test exercises with the users, as well as simulationof past events. Knowledge concerning past events permits understanding correctdesign of emergency action plans for mitigation of potential present and future events.This software is specifically designed for the Pacific Coast of South America, and isprepared in Spanish, with the intention of improving responses of inhabitants of coastalareas to the potential threat from tsunamis.     

Evaluation of mid-depth currents of NCEP reanalysis data in the tropical Pacific using ARGO float position information

1. Introduction The reanalysis dataset (Ji et al., 1995; Kalnay et al., 1996) offered by the National Centers for Environ- mental Prediction (NCEP) has been applied widely in relevant multidisciplinary research. Along with in- creasingly extensive observa…     

西北太平洋暖池区台风对海表盐度的影响

分析了西北太平洋暖池区2002和2003年夏季ARGO浮标得到的次表层温度和盐度剖面,结果表明大多数台风经过暖池区时,会引起海面盐度下降,这与Kwon和Riser等在大西洋观测到的飓风过后海面盐度上升的结论不同,表明西北太平洋暖池区特有的上层结构以及台风在此海域的降雨与大西洋不同,结果对研究西北太平洋暖池区的混合层混合和热交换过程有重要意义.     

LY-921计算机实验装置的总体设计与调试

本文介绍LY—921计算机原理实验装置的总体结构设计和整机调试。该装置能进行计算机部件实验,整机实验以及小型数字系统调试等实验。