天然气水合物数据挖掘服务组件的设计与实现

天然气水合物是21世纪一种具有巨大潜在价值的未来能源,在能源危机的今天已经引起各国政府和科研部门的重视。海域天然气水合物勘探调查手段丰富多样,不同的勘查方式涉及的相关地质参数的不确定性比较大,采用的天然气水合物资源分析方法和预测评价方法也都相对较复杂。而数据挖掘技术在数据分析、预测评价等方面优势明显,且在石油勘探及矿山等很多地学领域进行了运用,结果可信度比较高,大大减少了勘测成本。通过对天然气水合物勘查业务和数据进行分析,研究适用于水合物数据挖掘方法,设计并实现了基于IBM SPSS Modeler的天然气水合物数据挖掘服务组件,为天然气水合物勘查领域数据挖掘智能决策产品的研究奠定了良好的基础。同时也能够为海洋地质数据库建设和数据应用打下技术积累,从而为天然气水合物的勘探开发和综合评价提供帮助。     

基于MIS的通用编辑界面设计的关键技术及其实现

针对MIS系统中数据编辑的特点和共性，开发了一种通用的编辑界面，它能够编辑任一数据库的任一数据表，从而很好解决了在动态数据库中对可变表的编辑维护问题，提高了系统开发效率。     

基于网络安全的数据库信息系统开发探析

现代科学技术的不断发展进步,计算机信息技术被广泛的应用到社会的各行业领域中,因此而产生了海量的信息数据,将这些数据进行收集、分析和处理对于社会的发展具有重要的意义,计算机数据库应运而生.本文通过对基于网络安全的数据库信息系统开发进行深入的研究,分析网络安全视角下数据库信息系统的开发模式,分析在数据库的系统开发和管理中可能出现的问题,并提出可行的完善措施,以促进计算机数据库的实际应用水平.     

天然气水合物试验装置的智能化设计

介绍了一种天然气水合物实验研究装置，该装置能模拟水合物的生成和开采过程。系统工作稳定，性能完全符合实验要求，自动化程度高，为研究水合物提供了基本保证。     

基于CT的含水合物沉积物电阻率测量系统设计与开发

为满足从微观尺度研究沉积物孔隙中水合物分布对电阻率响应特性影响的需求,设计开发了基于CT的含水合物沉积物电阻率测量系统,包括天然气水合物实验模拟部分、电阻率测量部分和CT扫描部分,实现了水合物原位生成过程中电阻率和CT扫描图像的同时监测。通过开展甲烷水合物生成实验,验证了系统的可用性。实验结果表明：（1）电阻率随通过CT图像计算的水合物饱和度呈指数规律上升;（2）水合物饱和度为17.13%~30.72%时,阿尔奇公式中饱和度指数在1.57至2.48之间。所开发的测量系统为进一步开展不同环境条件下水合物生成分解实验提供了技术保障,为研究水合物微观分布对电阻率的影响以及优化水合物饱和度计算模型提供了数据支撑。     

基于手机的教务管理系统的设计与实现

本系统采用B/S体系结构,基于Android平台开发,客户端采用Java ME开发,服务器端采用Java EE开发,后台数据库使用Oracle 10.2.0,能够自动识别WALN。客户端主要负责数据的收集和显示工作,输入的数据客户端发送给服务器的Servlet,转交业务逻辑层EJB模块处理并通过JDBC与数据层进行通信后对数据库做相应的操作,并将结果发回客户端显示。     

多孔介质中天然气水合物二维模拟实验装置

本文介绍了一种天然气水合物模拟实验装置,该装置能模拟多孔介质中天然气水合物的生成和分解过程.能够通过测量平板内探针的电容判断水合物的状态变化.实践证明,该装置工作稳定可靠,性能符合实验要求.     

基于ElasticSearch的车型搜索引擎在保险系统中的设计和实现

随着保险行业信息化规模的不断扩大,各垂直领域的业务数据越来越多,不可避免地给传统结构化数据库在存储和查询效率方面带来了巨大挑战。如何实现数据的冗余备份和快速、高效查询已成为企业信息技术的一大难题。本文提出一种基于ElasticSearch的车型分布式搜索引擎,同时结合Logstash进行数据收集,实现车型数据的过滤存储和索引,并为保险出单系统提供统一的查询入口和高效的检索服务。实践表明,该系统可实现数据的冗余备份并提高检索车型数据的效率,目前已经在保险行业核心系统得到实际应用,取得了较好效果。     

XML与数据库结合技术的探讨

数据库管理系统是一种技术十分成熟、应用非常广泛的系统，而XML是一种发展势头良好的新兴的数据管理手段。在数据管理上，XML技术和数据库技术各有优势和不足，对这两种技术的融合和扬长避短就促成了XML和数据库的结合技术的发展。该文根据本单位设计和实现XML和数据库数据转换中间件的理论和实践知识，对XML和数据库结合技术进行探讨。     

相图数据库管理体系的研究

作为开发通用图示信息(图象、图形)数据库管理系统的一个尝试,本工作围绕相图信息的管理,探讨了相图数据库管理系统PD-DBMS(Phase Diagram Data Base Manegement System)的结构配置和数据管理方法。PD-DBMS系统采用四种不同的数据存储方式,通过自动建立的多级指针链予以定位和协调,所以该系统可以实现以单一数据库的形式来管理各类结构相异和长度不定的相图数据。数据存储部分在结构上分为三个子数据库,分别用于存放相平衡线的矢量数据、参考文献、和相图映象数据及其他一些理论预报相图所必需的热力学基本数据。这些子库通过PD-DBMS管理系统统一协调。该PD-DBMS系统除了具备一般数值型数据库的一些基本操作功能,如库维护、检索、输出等,还具备一些专门开发的智能化的辅助操作功能,如分子式解析、建立多级索引关系、模糊检索等。系统人机界面友好,便于用户使用。该数据库管理系统亦可方便地加以扩展以管理其它图示信息。     

Modeling gas hydrate equilibria in electrolyte solutions

Virtually all gas hydrate models use a statistical thermodynamic approach to describe solid phase gas hydrates. An alternative to this model is a “solid solution” model based on classical thermodynamics. Various models are used to describe associated gas phase and aqueous electrolyte properties. None of the electrolyte models, however, are state-of-the-art with respect to gas/electrolyte interactions. The objectives of this work were to (1) develop a classical thermodynamic approach for gas hydrate equilibria, (2) incorporate these hydrate chemistries into a state-of-the-art electrolyte model, and (3) validate the gas hydrate/electrolyte model.     

The Use of Splitting with Respect to Physical Processes for Modeling the Dissociation of Gas Hydrates

The work is devoted to modeling the phase transformations of gas hydrate inclusions in porous media. Studying these problems makes it possible to elaborate various technologies for the development of gas hydrate deposits. A two-block mathematical model of the dissociation of gas hydrates in a porous medium based on splitting with respect to physical processes is proposed and studied. An absolutely stable difference scheme is constructed and implemented in the spatially onedimensional case to numerically analyze the model. The water saturation, thawing, and the thermodynamic parameters (pressure and temperature) are calculated based on this difference scheme. An analysis of the data obtained by the calculations has confirmed the possibility of solving a number of typical problems of gas hydrate fluid dynamics using the above approach, including the problem of the complex dynamics of water and hydrate saturation of a formation.     

Interpreting temperature-strain data from mesoscale clathrate experiments

Gas hydrates may play an important role in global climate change, carbon sequestration, energy production and seafloor stability. However, formation and dissociation pathways in geologically complex systems are poorly defined. We present a new approach to processing large amounts of data from a LUNA distributed sensing system (DSS) in the seafloor process simulator (SPS) at Oak Ridge National Laboratory to monitor and visualize gas hydrate formation and dissociation in heterogeneous sediments. The DSS measures relative temperature/strain change with a high spatial resolution allowing the heat of reaction during gas hydrate formation/dissociation to be used to locate clathrate processes in space and time within the vessel. Optical fibers are placed in the sediment following an Archimedean spiral design and the position of each sensor is determined iteratively over the arc length using Newton's method. The DSS data are then gridded with a natural neighbor interpolation algorithm to allow contouring. The locations of sensors on the fiber were verified with hot and cold stimuli in known locations. Software was developed to produce temperature/strain linear and polar plots, which aid in locating significant hydrate formation/dissociation events. Results from an experiment using a vertically split column of sand and silt clearly showed initial hydrate formation in the sand, followed by slow encroachment into the silt. Similar systems and data processing techniques could be used for monitoring of hydrates in natural environments or in any situation where a hybrid temperature/strain index is useful.     

Anaesthesia record system on handheld computers--pilot experience and uses for quality control and clinical guidelines

This paper describes a mobile information system to collect patient information for anesthesia quality control. In this system, a mobile database program was designed for use on handheld computers (Pocket PC). This program is used to collect patient data at the bedside on the handhelds, with a daily synchronization of the data between the anaesthesiologists' handhelds with the anaesthesia database. All collected data are later used for quality control analysis. Furthermore, clinical guidelines will be included on these same handhelds. During the pilot phase, data from a sample set of about 300 patients were incorporated. The processes and interfaces of the system are presented in the paper. The current mobile database system has been designed to replace the original paper-based data collection system. The individual anaesthesiologist's handheld synchronizes patient data daily with anaesthesia database center. This information database is analyzed and used not only to give feedback to the individual doctor or center, but also to review the use of the guidelines provided and the results of their utilization.     

Molecular dynamics simulations for selection of kinetic hydrate inhibitors

Natural gas hydrates are ice-like structures composed of water and gas molecules that have long been a problem in petroleum industry. Heavy cost of alcohol and glycol injection has spurred an interest in called ‘kinetic inhibitors’ able to slow down the hydrate formation rather than prevent it. Since it is not possible to compare directly the macroscopic effects of different inhibitors on the kinetics of hydrate formation in computer experiments, a scheme capable of culling the list of candidates for experimental testing was proposed earlier [B. Kvamme, G. Huseby, O.K. Førrisdahl, Molecular dynamics simulations of PVP kinetic inhibitor in liquid water and hydrate/liquid water systems, Mol. Phys. 90 (1997) 979–991]. Molecular dynamics simulations were implemented to test several kinetic inhibitors in a multiphase water–hydrate system with rigid hydrate interface. In addition, a long-scale run was implemented for a system where the hydrate was free to melt and reform. Our conclusion that PVCap will outperform PVP as a kinetic hydrate inhibitor is supported by experimental data. We demonstrate that numerical experiments can be a valuable tool for selecting kinetic inhibitors as well as provide insight into mechanisms of kinetic inhibition and hydrate melting and reformation.     

GPS信息与常规仪表信息融合及检测方法

提出GPS信息与常规仪表信息融合方法。基于该方法设计了田间数据自动采集系统。利用Windows98操作系统,以VB5．0为前端应用软件,对该信息进行检测、分类和存储。从而为精细农业创建了一种带有空间、时间和属性的数据库。     

汽车载重称量系统的设计

介绍了汽车载重称量系统的设计过程，以Visual Basic6.0和Access数据库为软件平台，设计开发了一个具有实时数据采集，批量数据载入，以及完善的数据查询，统计和报表生成与打印功能的管理系统，该系统已投入实际应用，提高了汽车载重称量的自动化水平和企业管理水平。     

Characterization of CO2 and mixed methane/CO2 hydrates intercalated in smectites by means of atomistic calculations

The recent increase in anthropogenic CO₂ gas released to the atmosphere and its contribution to global warming make necessary to investigate new ways of CO₂ storage. Injecting CO₂ into subsurface CH₄ hydrate reservoirs would displace some of the CH₄ in the hydrate crystal lattice, converting simple CH₄ hydrates into either simple CO₂ hydrates or mixed CH₄CO₂ hydrates. Molecular simulations were performed to determine the structure and behavior of CO₂ and mixed hydrate complexes in the interlayer of Na-rich montmorillonite and beidellite smectite. Molecular Dynamics (MD) simulations used NPT ensembles in a 4 × 4 × 1 supercell comprised of montmorillonite or beidellite with CO₂ or mixed CH₄/CO₂ hydrate complexes in the interlayer. The smectite 2:1 layer surface helps provide a stabilizing influence on the formation of gas hydrate complexes. The type of smectite affects the stability of the smectite-hydrate complexes, where high charge located on the tetrahedral layer of the smectites disfavor the formation of hydrate complexes.     

一种基于构造字符串的数据存取方法

为了实现数据库系统开发过程中复杂数据的存取,文中提出了基于构造字符串的数据存取方法。以多个参数名和参数值构造一个实体的多个属性称为组。以组名和组值构造多个实体的属性称为组集合,把组集合作为一个字符串存储在数据库中。数据的访问是根据组名和参数名来反向提取组值和参数值。建立了数据存取对象模型,用实例说明了该对象的使用方法。实例表明该方法能够提高数据库设计的灵活性,增强应用程序和数据库的独立性,快速、方便地实现数据的存储和访问。     

物联网架构下的智能火灾预警系统

摘要：设计了一种基于物联网架构的智能火灾预警系统,以ZigBee无线传感器网络为底层的数据采集和传输网络,完成对火灾信息的准确感知。WSN节点以CC2530和CC2591为处理和无线收发单元,以DHT21和MQ传感器为数据采集单元,实现了多传感器数据采集。采用Qt技术设计了系统GUI,基于qextserialport类和SQLite数据库实现了系统的串口通信和数据库操作。测试表明,系统准确可靠,GUI界面友好,易于操作。