Grove Mountains （GRV）99027： A new Martian meteorite

We report the petrography, mineral chemistry and oxygen isotopic composition of GRV 99027, a new Martian meteorite recently collected during the 16th Chinese Antarctic Research Expedition. This meteorite consists of two textural regions. The interstitial region is characterized by the presence of plagioclase and phosphate, and higher FeO contents of olivine and orthopyroxene, in comparison with the poikilitic region. All of the observations are similar to the three known Martian lherzolites. We classify GRV 99027 as the fourth sample of Martian lherzolite.     

Hardware system design for UHF surface velocities radar

UHF surface velocities radar is developed based on the successful ocean state measuring and analyzing radar system. The design method for UHF radar system is presented. It is designed to operate at UHF channel, and the transmit power is under 5W. Maximum range of field test over fresh water can be a kilometer. The field tests at Tangsun River and at Majiatan and Gaohazhou proved that USVR System can be used successfully.     

西北太平洋部分海域AVHRR、TMI与MODIS遥感海表层温度的初步验证

选取[10～35°N,110～165°E]的西北太平洋海域,利用2002年7月～2005年12月Argo浮标数据对AVHRR/MODIS/TMI SST的daily（升轨）数据进行验证.结果表明：AVHRR/MODIS/TMI daily SST与Argo浮标5～6 m层温度总体的均方差rms在0.6～0.9℃,平均偏差bias在-0.2～0.2℃,平均绝对偏差bias_abs在0.3～0.7℃.这与三传感器全球范围的SST反演目标相当,说明在本区域SST反演不存在显著偏差.各遥感SST与浮标温度的差异存在季节变化,夏季偏高,很可能与夏季垂直混合较弱,比对采用的实测水温与海表温度差距较大有关.在3种遥感SST中,TMISST偏离实测值的程度最高,且偏离范围较大.作者认为这与该区域黑潮经过,产生诸多涡旋和锋面,SST时空变化剧烈而TMI空间分辨率较低有关.本研究将为此西北太平洋海域的多源SST融合提供一个比较可靠的依据.     

一种基于内容的图像检索方法

论述了基于颜色特征的图像检索和基于纹理特征的图像检索,在此基础上提出了一种利用图像两种内容特征进行图像检索的方法。     

一种Log-Gabor滤波结合特征融合的虹膜识别方法

提出了一种Log-Gabor滤波器结合特征融合的虹膜识别方法.该方法利用多尺度多方向二维Log-Gabor滤波器构成的多通道滤波器提取虹膜纹理特征,在特征层利用幅值信息对同尺度下多方向的Log-Gabor特征进行融合,以压缩冗余信息及去除非有效特征,然后对融合后的特征进行相位编码,并运用加权海明距离进行匹配,匹配时借助噪声屏蔽码去除眼睑遮挡干扰.提出了一种虹膜图像质量评价方法,可有效鉴别不适于识别的低质量虹膜图像.与传统的Gabor方法相比,新识别方法能得到更小的等错误率和相同错误接收率下更小的错误拒绝率,同时又将虹膜特征码的大小压缩为传统方法的1/2,可提高匹配速度及节约存储空间.在CASIA和UBIRIS虹膜库的测试结果表明,与传统Gabor方法相比,该方法在错误接受率为0.01%和0.1%时的错误拒绝率分别降低了0.57%和0.36%,等错误率降低了0.25%,特征码长度为128 B,减少了50%.     

橡胶接触轮硬度、槽形和工件硬度对砂带磨削的影响

本文主要研究橡胶接融轮硬度、槽形和工件硬度对金属切除量、砂带磨损、磨削比、磨削力 和工件表面粗糙度的影响，它对砂带磨削时根据不同的工件硬度、不同的技术要求正确选用橡胶接触轮的硬度和槽形提供了依据．     

无规扩散类反应表面生长动力学行为

研究了无规扩散类表面生长的动力学和标度行为，研究了两种粒子（Ａ、Ｃ）在二维衬底上的聚集．当Ｃ粒子的几率ｑ＝０时，系统表现出泊松生长．当ｑ≠０时，表面表现出粗化的形貌特性，存在着粗化转变．对Ｃ粒子扩散步长以及扩散几率对粗化转变的影响也进行了研究     

CeCl3对H13钢固体粉末法硼钒共渗的影响

研究了CeCl3对固体粉末法硼钒共渗渗层成分、组织和性能的影响 .发现随CeCl3加入量的增加 ,渗层中新相Al2 O3的量不断增多 ;当CeCl3加入量为 5%时 ,渗层中出现连续致密分布的Al2 O3黑区组织 .对此进行了性能测试和机理探讨 .     

Texture preserving denoising method combining total variation and wavelet shrinkage

In this paper,we propose a new image denoising method that combines total variation(TV) method and wavelet shrinkage. In our method,a noisy image is decomposed into subbands of LL,LH,HL,and HH in wavelet domain. LL subband contains the low frequency coefficients along with less noise,which can be easily eliminated using TV-based method. More edges and other detailed information like textures are contained in the other three subbands,and we propose a shrinkage method based on the local variance to extract th...     

A new texture analysis approach

A new texture analysis approach by using Gibbs random field model is discussed. A parameter vector is defined in order to compute potentials of textures. It is found that texture features can be provided by its corresponding parameter vector, and the vector can be estimated in terms of maximum potential. Conclusions can be inferred that this new method based on the maximum potential is valid. Supported by the National Natural Science Foundation of China Zhang Zhan: born in 1971, Ph. D. graduate student