基于分类规则挖掘的遥感影像分类研究

分析了目前遥感影像的统计分类、神经网络分类及基于符号知识的逻辑推理分类方法的优缺点.以GIS为平台,构建了多源空间数据库,将数据挖掘的思想和方法引入遥感影像分类中,提出了面向分类规则挖掘的遥感影像分类框架.针对遥感光谱数据及其他空间数据的特点,定义了连续属性样本分类概念和分割点评价指标,提出了一种新的连续属性样本分类规则挖掘算法.选择一个试验区,采用该算法分别对遥感光谱数据、遥感光谱和DEM数据相结合的数据进行分类规则挖掘、遥感影像分类和分类精度比较.结果表明：（1）该算法具有较高的分类精度;（2）加入DEM等与分类相关的其他空间数据可以提高遥感影像的分类精度.通过挖掘分类规则进行遥感影像分类,扩展了基于知识的逻辑推理分类方法中知识获取渠道,提高了分类规则获取的智能化程度.新的连续属性样本分类规则挖掘算法,扩展了归纳学习算法对连续属性样本分类的适应性.     

Study on the Variational Assimilation Technique for the Retrieval of Wind Fields from Doppler Radar Data

This paper introduces a variational assimilation technique for the retrieval of wind fields from Doppler radar data. The assimilated information included both the radial velocity (RV) and the movement of radar echo. In this assimilation technique, the key is transforming the movement of radar echo to a new radar measuring variable- "apparent velocity" (AV). Thus, the information of wind is added, and the indeterminacy of recovering two-dimensional wind only by AV was overcome effectively by combining RV with AV. By means of CMA GRAPES-3Dvar and CINRAD data, some experiments were performed. The results show that the method of retrieval of wind fields is useful in obtaining the construction of the weather system.     

THE TEST OF APPLYING RADAR TREC WIND IN THREE-DIMENSIONAL VARIATIONAL ASSIMILATION

1 INTRODUCTIONThat the radar data are reasonably ingested into theassimilation analysis system to improve the analysisquality and prediction precision is one of the problemsmeteorologists currently try to resolve. Many scholarshave already obtained some r…     

基于改进遗传算法的公路桥梁损伤程度标定的两阶段法

提出了基于改进遗传算法的公路桥梁损伤程度标定的两阶段法。第一阶段:应用静应变残差进行损伤定位;第二阶段:基于已经识别出的损伤位置,利用改进的遗传算法进行损伤程度的标定。两阶段方法有效地克服了同时进行常规的损伤位置识别和损伤程度的标定的收敛速度慢、存储空间大及可能误标定等问题。某三跨连续桥梁应用分析发现,在已知很少实测数据的情况下,对损伤程度的识别取得较理想的效果,证实了基于改进遗传算法的两阶段法用于损伤程度的识别具有更高的效率,更好的灵敏度、稳定性和可靠性。     

A network communication and recording system for digital seismic observation

Introduction Digital seismic observation systems originated from 1970′s. It has developed greatly in the past 30 years up to now. Its performances were improved, dynamic range and resolution increased a lot, the power consumption decreased a lot, and so on (YOU et al, 2003a, b). In a word, the dream of broad frequency-band, big dynamic range, digitalization of seismic observation has come true already. But, the previous digital seismic observation systems only support communica-tion based o…     

Mineral chemistry, geochemistry and U-Pb SHRIMP zircon data of the Yangxin monzonitic intrusive in the foreland of the Dabie orogen

The lower Yangtze River area, situated at the fore-land of the Qinling-Dabie orogen, is an important re-gion for high-grade mineral deposits in Cen-tral-Eastern China. Nearly 300 different types of Cu and Au polymetal, Fe, and S mineral deposits have been found and mined in this zone[1,2]. The overall distribution of these deposits follows the trend of the Mesozoic igneous rocks, suggesting their fundamental controls on the formation of these deposits. Geo-physical and geologic observatio…     

晋南中条山古元古代花岗岩的锆石U—Pb年龄

用单颗粒锆石U-Pb稀释法测定了中条山古元古代花岗岩的时代,获得寨子英云闪长质片麻岩、横岭关花岗闪长质片麻岩和烟庄钾长-二长花岗质片麻岩的成岩年龄分别为2321 Ma±2Ma、2256Ma±35Ma和2297Ma±21 Ma.结合区域地质背景和地球化学资料,认为中条山地区可能存在时限为2350～2250Ma的构造-热事件.     

STUDY ON THE CHARACTERISTICS OF TROPICAL CYCLONES ACTIVITY OVER THE WESTERN NORTH PACIFIC IN 2004 AND THE CAUSATION

In this paper, we summarized the characteristics of tropical cyclones (TC) activity over the western North Pacific in 2004 and analyzed their causation. Compared with the normal, the annual frequency of TC in 2004 was slightly higher, tropical cyclones in 2004 had a longer life span and occurred in a concentrated period, the source of TC were situated eastward; in all tracks of TC, the recurvature tracks took up larger proportion, the landfall regions of TC were located northward, which concentrated from East China to Japan. The primary causes were revealed as follows. Firstly, the intensity and area of the western North Pacific subtropical high was stronger and larger than usual respectively, and its ridge was frequently in the form of cells and stretched northwestward. Secondly, the convergence of intertropical convergence zone (ITCZ) was reinforced and the convergence zone moved more eastward than average. Thirdly, the meridionality of the westerlies was larger than average and the cell-shaped ridge formed a saddle region, which is in favor of TC northward motion and recurature.     

区域资源定量评价中面金属量法的应用

地球化学方法被普遍应用于矿产资源评价,但多数方法都只是基于地球化学数据本身而进行的,较少考虑除成矿物质来源之外的诸如构造、地层等地质环境的影响。文章运用面金属量法,在充分研究地质因素的基础上,确定了预测单元及地球化学背景值,在一定程度上屏蔽了虚假资源量,对东天山地区铜的资源量进行了定量评价。预测认为,东天山地区铜的资源潜力巨大。     

云南毛坪铅锌（银、锗）矿床流体包裹体特征及成矿流体来源

云南毛坪铅锌(银、锗)矿床是川滇黔成矿域滇东北地区以碳酸盐岩为主岩的中-大型铅锌(银)矿床的典型代表。矿体空间分布严格受 NE 向层间断裂带和猫猫山倒转背斜的控制。主要脉石矿物(铁方解石、方解石及白云岩)中的流体包裹体发育,一般较小(3～15μm),主要为纯液相和液相包裹体,常沿矿物结晶面密集成群展布。成矿流体属 Na~ -K~ -Ca~(2 )-CI~- -F~- 型,流体包裹体均一温度为180～218(C,盐度为4.1 wt%～9.5 wt% NaCl,成矿压力为406×10~5～570×10~5Pa。在主要脉石矿物流体包裹体中,Na~ /K~ (1.54～4.53)与 Cl~-/F~-(0.72～156.33)较高,而重晶石流体包裹体中 Na~ /K~ (0.32～8.36)与 Cl~-/F~-(1.06～16.77)较低。成矿流体的(D 为-23‰～-64‰,方铅矿、闪锌矿和黄铁矿中流体包体(~(18)O_(v-SMOW)依次为0.3‰～6.2‰,-9.0‰～3.4‰和-6.8‰～-12.7‰。脉石矿物的(~(13)C_(v-PDB)为-1.1‰～-3.7‰。以上信息更好地揭示了成矿流体是变质水、岩浆水和建造水混合的产物,它们与沉积作用、昆阳群基底的变质作用及岩浆热液作用有关。该矿床本身可能是富含铅、锌、银等成矿流体对流循环沿构造"贯入"而成。该矿床不同于典型的 MVT 型铅锌矿床,是一碳酸盐岩为主岩的铅锌多金属硫化物矿床。