The Research of Manifold Block Optimization Design Method

This paper puts forward a method of parameterized design,i.e.the geometric parameters of hydraulic elements are inputted into specially designed drawing interface program,so the manifold block drawing of hydraulic system can be automatically created by the computer and AUTOCAD.Eventually not only the mistakes can be avoided but the efficiency is greatly increased and the time of designing is noticeably shortened as well.     

大口径球墨铸铁给水管的结构计算

球墨铸铁管道因其直径大、强度高、柔度好、耐腐蚀等优越性能被应用于引黄工程中。为了对新型的大口径球墨铸铁管道有一个比较全面的了解和认识，通过计算实例对其结构计算问题进行了探讨。     

稳定土拌和楼流量测试与配合比控制

通过对WBS-300型稳定土拌和楼常年使用,提出以流量测试来控制稳定土配合比从而保证混合料的拌和质量。     

聚苯乙烯－路易斯酸复合物催化下二茂铁甲醛与乙二醇的缩醛化反应

用不同粒度交联聚苯乙烯（含ＤＶＢ７％）在ＣＳ＿２中与ＡｌＣｌ＿３或ＴｉＣｌ＿４作用制得一种稳定的复合物．研究了不同粒度复合物存在下二茂铁甲醛与乙二醇的缩醛化反应，对反应条件进行了较为详细的研究，结果表明这两种载体催化剂对二茂铁甲醛与乙二醇的缩合反应均有良好的催化效果，而且使用方便，反应产物易于分离．     

SXSES－DSS数据库系统的设计与实现

ＳＸＳＥＳ－ＤＳＳ数据库系统通过投影技术将多维层次的数据结构转化为二维表结构，实现了数据的关系存储。系统建立了无数据管理字典，采用压缩索引，以管理数据的描述信息，节约存储空间，提高查询速度。为了能够自动产生导出数据和进行图表输出，系统提供了自定义算术表达式和图表输出功能。此外并利用ＯＲＡＣＬＥ提供的机制，实现了系统的完整性、一致性和安全性控制。     

Using local geopotential model to implement underwater passive navigation

A main aspect of underwater passive navigation is how to identify the vehicle location on an existing gravity map, and several matching algorithms as ICCP and SITAN are the most prevalent methods that many scholars are using. In this paper, a novel algorithm that is different from matching algorithms for passive navigation is developed. The algorithm implements underwater passive navigation by directly estimating the inertial errors through Kalman filter algorithm, and the key part of this implementation is a Fourier series based local geopotential model. Firstly, the principle of local geopotential model based on Fourier series is introduced in this paper, thus the discrete gravity anomalies data can be expressed analytically with respect to geographic coordinates to establish the observation equation required in the application of Kalman filter. Whereafter, the indicated gravity anomalies can be gotten by substituting the inertial positions to existing gravity anomalies map. Finally, the classical extended Kalman filter is introduced with the differences between measured gravity and indicated gravity used as observations to optimally estimate the errors of Inertial Navigation System (INS). This navigation algorithm is tested on simulated data with encouraging results. Although this algorithm is developed for underwater navigation using gravity data, it is equally applicable to other domains, for example vehicle navigation on magnetic or terrain data.     

A novel approach in predicting non-stationary time series by combining external forces

In this paper, we investigate a novel technique that reconstructs the observed time series and incorporates driving forces. Furthermore, to illustrate and test the technique, we consider a couple of predictive experiments using ideal time series provided by the logistic and Lorenz systems with specific driving forces. The preliminary results show this approach can improve prediction proficiency to some extent, and the external forces play a similar role to that of state variables.     

Comparative study of gas accumulations in the Permian Changxing reefs and Triassic Feixianguan oolitic reservoirs between Longgang and Luojiazhai-Puguang in the Sichuan Basin

Reef and oolitic gas reservoirs in the Permian Changxing and Triassic Feixianguan formations have been discovered in both the Luojiazhai-Puguang and Longgang areas of the Sichuan Basin, but the accumulation scale, abundance and distribution patterns differ greatly. In fact, the two areas have more differences than they have similarities. Similarities include: (1) the lithology, properties and types of porosity of the reef and oolitic reservoirs are primarily consistent in the two areas; (2) well-developed regional caprocks that seal the fluid system; and (3) accumulation process histories, with liquid hydrocarbon charging at an early stage, cracking into gas at a high to over-mature stage, adjustment of gas reservoirs at an uplifting stage, and final reservoir generation at a late stage. Differences include: (1) gas accumulations in the Luojiazhai-Puguang area that are dominated by oil-type cracked gas, with multiple and sufficient gas sources, contrasting with gas accumulations in the Longgang area that are dominated by coal-sourced gas with insufficient gas sources; (2) heterogeneity and horizontal diversity of reservoirs in the Longgang area that are stronger than in the Luojiazhai-Puguang area; and (3) the development of deep and large faults in the Luojiazhai-Puguang area that link source, reservoir and migration pathways, contrasting with poorly developed faults in Longgang area, where laterally variable fractures are the major migration pathway. Because of these differences, abundant large-scale structurally-controlled gas accumulations are developed in the Luojiazhai-Puguang area, whereas lithology plays a more important role in gas accumulation in the Longgang area where accumulations are smaller-scale and have lower gas-bearing abundance. We suggest that future exploration for reef and oolitic gas accumulations should be strengthened in NE Sichuan and NW Sichuan Jiulongshan. In particular, the transitional zone between Longgang and Kaijiang-Liangping Bay has the best potential for new discoveries.     

一类渐进线性p（x）-Laplace方程解的存在性

在广义Lebesgue空间Lp（x）（Ω）和广义Sobolev空间W1,p（x）（Ω）的基本理论体系的基础上得到p（x）-Laplace方程有非平凡解的一个充分条件.     

Building distributed web GIS: a mobile-agent based approach

The diversity of GISs and the wide-spread availability of WWW have led to an increasing amount of research on integrating a variety of heterogeneous and autonomous GISs in a cooperative environment to construct a new generation of GIS characterizing in open architecture, distributed computation, interoperability, and extensibility. Our on-going research project MADGIS (Mobile Agent based Distributed Geographic Information System) is reported, in which we propose the architecture of MADGIS to meet the requirements of integrating distributed GIS applications under Internet environment. We first describe the architecture of MADGIS, and detailed discussions focusing on the structure of client site, server site and mobile agent in MADGIS. Then we explore key techniques for MADGIS implementation.