Parallel evolution strategy on grids for the protein threading problem

The protein threading problem is the problem of determining the three-dimensional structure of a given but arbitrary protein sequence from a set of known structures of other proteins. This problem is known to be NP-hard and current computational approaches to threading are unrealistic for long proteins and/or large template data sets. In this paper, we propose an evolution strategy for the solution of the protein threading problem. We also propose three parallel methods for fast threading. Our experiments produced encouraging preliminary results in term of threading energy as well as significant reduction in threading time.     

云南斗南锰矿区地质构造对嘎科矿层厚度的影响分析

云南文山斗南锰矿区的勘探钻孔资料和已经实际揭露的井下地质情况,通过对井下地质构造特征的分析,了解影响锰矿层厚度变化的主要地质构造因素,对矿段合理布置采掘巷道和选择合理的采矿方法具有指导意义。     

SAR实时成像中交叠FFT的有效实现

SAR实时成像处理中常采用子孔径交叠来提取算法的并行性,但为抑制栅栏旁瓣效应,需要对输入数据进行交叠处理,极大地增加了处理数据量.本文对交叠FFT的一种有效实现-Fold FFT给出了详尽分析与理解,指出这种方法是通过采用更长的滤波器阶数,来获得所要求的滤波器性能,达到减少交叠的目的.本文同时对实现时的相关问题进行了讨论.仿真结果证明了其正确性.     

Skin/Weave/Pattern

‘Fabric is the perfect mediator between the firm and the flowing.’ Nigel Coates celebrates the textile's rediscovery as a metaphor for the architectural envelope, liberating it from its reputation as having only a supporting, ‘comfort role’ in the interior. He describes his own experiments with textiles at Branson Coates Architecture and the Royal College of Art (RCA), in which they alternately become skin, weave and pattern operating at every scale from the individual body to the urban plan. Copyright © 2006 John Wiley & Sons, Ltd.     

柴达木中央断裂带及其地质意义

根据重力、航磁、地震、遥感、地表地质等资料的综合研究,认为柴达木盆地中部存在着中央断裂带。中央断裂带将盆地基岩分为性质截然不同的南北两部分,说明柴达木盆地存在吕梁期以前的古陆核。结合对中酸性岩浆岩氧化物成分进行的构造环境判别结果,可以进一步推断古阿尔金洋的存在使得古秦祁昆洋的范围扩大。阿尔金运动使阿尔金洋封闭,岛弧成陆,形成前寒武纪的褶皱镶嵌边。图4照片1表1参13（谈迎摘）     

Predictions of the minimum relative depth of die cavity and the minimum amount of preforming in the radial extrusion of tubular components

In this study, both the minimum relative depth of die cavity and the minimum amount required in preforming are determined to produce a defect-free product of tubular component in the preforming technique of radial extrusion. This scheme is based on the least amount of material dissipation in radial extrusion of tubular component. A finite element based code is utilized to investigate the effects of various amount of relative deformation and different relative depths of die cavity on the material flow characteristics resulting in the movements of the defects locations. An algorithm is thus developed for the determination of minimum relative depth of die cavity and the minimum amount required in preforming, and the abductive network is also applied to synthesize the data sets obtained from the numerical simulations through the algorithm proposed in this study. Consequently, a prediction model is established for organizing the minimum relative depth of die cavity and the related minimum amount of preforming of the tubular component that the locations of induced defects are just coincided with the inner surface of the tube at the end stroke of deformation.     

离合器内齿轮包挤压成形工艺及实验研究

研究了在离合器上使用的圆柱直齿内齿轮的加工工艺,与当前使用的冷挤压法成形工艺的比较表明,该工艺克服了冷挤压成型齿时载荷大,模具凸模磨损严重,使用寿命短的缺陷,解决了直接冷挤压成形内齿轮中的产品质量一致性不够好的问题,得到了齿形饱满,端面平整的内齿轮,而且成形内齿与预挤分开,使带齿模具凸模寿命可得到延长,具有生产实用化的前景。     

褶皱构造对寨上金矿区矿体的控制

断裂是寨上金矿区的赋矿构造,但其形成和形态受褶皱的控制,褶皱对成矿物质的迁移和富集具有内在的控制作用。根据区域构造格架及矿区脉体分布特征,将矿区控矿构造系统划分为4级。通过重点分析矿区控矿主体构造,即纳纳牧场背斜对矿体的控制作用,得出矿区已知脉体的产状明显受到褶皱的控制,由于岩性组合不同造成在褶皱的不同部位有不同的构造形式,褶皱控制了矿区的矿化程度。基于此认识,认为褶皱北翼具有较大找矿潜力,褶皱核部的南矿带脉体浅部具有一定的工作价值,而褶皱南翼则不具备成矿条件。     

贝尔凹陷褶皱构造样式及成因分析

贝尔凹陷是海拉尔盆地中成藏条件最优越的凹陷之一，发育的构造样式以伸展断块为主，存在部分褶皱构造，研究褶皱构造不仅可以发现褶皱类圈闭，正确分析褶皱构造成因还有助于进行盆地构造演化分析。贝尔凹陷中褶皱构造油气富集情况差异很大，通过对褶皱构造成因进行分析，指出聚集油气最有力的褶皱构造是反向断层遮挡的断鼻构造和滑塌型背斜构造，值得继续探索的是塌陷背斜构造。     

噶尔盆地南缘复杂构造几项解释技术的应用

准噶尔盆地南缘油气资源非常丰富。但是,由于地质条件复杂,资料品质非常差,因此,其构造样式很难建立。为了准确建立南缘的构造样式,按照断层相关褶皱理论的基本原理,利用建模技术、变速成图技术等几项新的解释技术,我们建立了一套新的、不同于以往的构造模型。这些模型在后来的钻井中已得到证实。