基于变分原理的自适应网络技术及其权函数问题研究

利用两个具有解析解的算例研究基于变分原理的自适应网络技术。结果表明，对运动激波算例，权函数考虑二阶导数项比考虑梯度项更能有效地减小误差；对气旋锋生算例，仅以梯度作为权函数亦不能提高精度，考虑速度场、锋生函数分布的权函数能更合理地安排网络；对照解析解，发现提出的自适应网络技术能明显提高计算精度，在节省内存等方面显示了突出的优点。     

Remote sensing land surface wetness by use of TRMM/TMI microwave data

Summary The water cycle analysis is the most important part of the GEWEX project. In the water cycle analysis, the land surface wetness information plays an important role. TRMM/TMI is a new kind of microwave image unit, and has great potential application in land characteristics analysis, especially in remote sensing of land surface wetness information and the monitoring of flood and drought situations. In this study, the wetness index analysis method was used to analysis surface wetness during the summer of 1998 over Boyang and Tongting lake area in China, and we retrieved the land surface emissivity over the same area to estimate the land surface wetness. To accomplish this, we have first studied the TRMM/TMI forward characteristics. By using the VIDSORT model, we developed wetness indexes BWI by combining three window channels of TRMM/TMI. According to our analysis results, the wetness BWI10 are better than the other indexes. So we use the best wetness indexes (BWI10) sensitive to the land surface wetness changes to do our flood classification and monitoring. In our calibration/validation test, the data from the China L-SAR (located on an airplane) and the Canadian Radar-SAR aboard on the Radarsat were used. At the same time we also have tried to retrieve the surface microwave emissivity from the TMI data. We use the emissivity product to estimate the land surface wetness, and we also got a good result. Future work will focus on investigating possible improvements to the algorithm and extending the testing of the algorithm to other regions. Received October 10, 2001 Revised December 18, 2001     

珠江三角洲两工业区土壤环境磁学初步研究

对珠江三角洲东莞石龙、顺德容奇—桂洲两工业区的土壤磁性进行初步研究,获得两地区6个柱样及48个表层样品的磁化率（X）和天然剩余磁化强度（NRM）的结果,石龙地区的X,NRM的垂直变化平均值分别为10．86×10－6SI和6．73×10-6A·m－1,顺德容桂地区X,NRM的垂直变化平均值分别为96．84×10－6SI和31．49×10－6A·m－1,表层样容桂地区X和NRM值大于石龙地区,表明两地区土壤的磁载体存在明显的差异,磁记录大致能反映现代环境的信息。     

直读式流速仪升级的使用维修对策

通过对比、分析国产ＺＳＸ系列直读式流速仪Ⅰ和Ⅱ型显示器的不同之处,介绍它们的兼容方法,使之因仪器升级而被淘汰的流速仪资源被充分地利用。     

A study of pH effect on protease activity of larval and young porgy

ＡｓｔｕｄｙｏｆｐＨｅｆｆｅｃｔｏｎｐｒｏｔｅａｓｅａｃｔｉｖｉｔｙｏｆｌａｒｖａｌａｎｄｙｏｕｎｇｐｏｒｇｙＩＮＴＲＯＤＵＣＴＩＯＮＰｏｒｇｙ（Ｐａｒｇｒｏｓｏｍｕｓｍａｊｏｒ）ｉｓａｓｐｅｃｉｅｓｏｆｉｍｐｏｒｔａｎｔｃｏｍｍｅｒｃｉａｌｆｉｓｈ...     

Metasomatic origin of some of the eclogite-bearing carbonate rocks in the Dabie mountain region, China

Carbonate rocks are one of the major hosts to eclogite in the Mt. Dabie region. Eclogite bodies enclosed in the carbonate rocks occur mostly as knobs, ovoids and lenses measuring centimeters to tens of centimeters in size. The bodies have been intensely carbonatized and usually have transitional contacts with their carbonate hosts. The carbonate rocks have abundant relics of eclogite minerals and their retrogressive derivatives. The REE patterns of the carbonate rocks are characterized by the absence of negative Ce anomaly. These features suggest that a considerable portion of the eclogite-bearing carbonate rocks in the Mt. Dabie region was produced by carbonatization of eclogites and their retrogressive derivatives. These carbonate rocks suffered deformation and recrystallization after their formation. This research project was financially supported by the Ministry of Geology and Mineral Resources (Project No. 9501102-04-1).     

中国主要类型锑矿床硫同位素组成及地球化学特征

中国主要类型锑矿床的硫同位素组成范围变化很大,锑矿床中各种矿物（辉锑矿、黄铁矿、闪锌矿、雄黄、方铅矿、重晶石、毒砂、辰砂、脆硫锑铅矿）的δ３４Ｓ值从－３２．７‰变化到＋３４．８‰,极差值高达６７．５‰。各类锑矿床中矿物的硫同位素组成变化各异,说明锑矿床成因较复杂,硫的来源不仅有海水中沉淀的硫酸盐硫,而且还有生物、细菌形式的还原硫和深源硫（岩浆作用、喷流作用等）,从而形成不同类型或成因复杂的锑矿床     

磁黄铁矿在纳米碳管生长中的作用

本文采用天然磁黄铁矿矿物－六方磁黄铁矿和单斜磁黄铁矿分别作催化剂,引入电弧法生长纳米碳管,发现二者具有截然不同的催化效果。在此基础上,探讨了在合成纳米碳管实验中磁黄铁矿的催化作用及催化机理。     

改进快速模拟退火方法进行AVO岩性参数反演

以广义波乐兹曼的吉布斯（Ｂｏｌｔｚｍａｎｎ－Ｇｉｂｂｓ）统计理论为基础,将数认（ｎｕｍｃｒａｌ）和依赖于温度的似柯西（Ｇａｕｃｈｙ）分布相结合建立一种新的扰动模型,改进接受概率,提出了一种非常快速模拟退火法（ｖｅｒｙ ｆａｓｔ ｓｉｍｕｌａｔｅｄ ａｎｎｅａｌｉｎｇ）。通过多参数的振幅随炮检距变化（ＡＶＯ）的合成数据和实际投资试算结果表明,该方法能在高温下进行大范围内的搜寻,解的稳定性好和抗随机干     

非接触式六自由度运动测量与分析方法

本文提供了一种非接触式六自由度运动测量与分析方法。首先应用位置测量仪（ＰＳＤ）对安置在模型上的红外线发光源（ＬＥＤ）进行测量,然后用所编制的软件计算出模型的六个自由度运动情况。该方法避免了接触式测量仪对模型作用一定的力而产生的误差,同时具有较高的位置解析度与频率响应能力,测量结果精度较高。该方法可同时测量空间三个点的运动坐标从而可用计算机求得模型在空间的六个自由度运动情况。测量与分析结果令人满意。