大长径比整流罩光学系统设计

提出一种采用大长径比非球面整流罩的导引头光学系统,分别就其像差特性和像差校正方法进行分析和探讨.该系统整流罩的长径比为2,工作谱段为中红外波段,半视场角为30°,F数为2.设计结果表明成像质量接近衍射极限,满足红外光学系统的成像要求.     

基于差动共焦的并行三维形貌检测系统的研究

为提高并行共焦检测系统的测量精度和分辨率，基于差动共焦原理，提出了一种全场非扫描三维形貌检测系统．该检测系统利用微透镜阵列产生的二维点光源阵列来实现并行全场共焦探测；反射光路采用差动设计，使用两个CCD同步测量离焦光斑强度信号。通过使用光斑光强差动算法，可以有效抑制光源的噪声和漂移对测量结果的影响；利用差动共焦特性曲线中的线性关系，实现在较大采样间距下获得较高的轴向分辨率。实验证明该检测系统是可行的。     

模型人眼的视网膜自适应成像系统

为了更好的进行人眼视网膜成像探测及人眼像差校正,建立了一套基于液晶波前校正器的模型,模拟人眼眼底的自适应成像系统。该系统采用Shark-Hartman波前探测器进行波面探测,将探测所得波前畸变经过计算处理转化为灰度图通过电脑施加到LCOS上进行波面校正,通过校正人眼像差的方式来提高系统成像质量。经过校正后,系统波误差从1．92μm降低到0．048μm系统分辨率接近70lp／mm已经到达该光学系统衍射极限分辨。可以满足低阶大像差情况下的模拟人眼视网膜成像要求。     

基于CCD的光纤式位移检测技术

介绍一种精确、远距离非接触检测机械位移的方法，检测系统采用面阵CCD摄像机获取被测光纤端部出射光斑图像的灰度分布，由灰度加权平均法提取光斑的特征点，通过检测特征点的位移获得光纤的位移，从而得到被测件的位移。实验结果表明，系统的稳定性为1．5μm，系统达到亚像元级的分辨率。     

太阳模拟器光源离焦对光斑的影响分析

针对聚焦型太阳模拟器光源离焦量与光斑辐照度的关系开展了研究,以聚焦型太阳模拟器光学系统为研究对象,根据某型号的短弧氙灯及其椭球聚光镜进行模拟计算,依据氙灯能量分布图及其配光曲线,将发光体简化为两端不发射光线、侧面发射光线的柱形发光体。在光学模拟软件TracePro中将简化的发光体及其椭球聚光镜进行建模,主要模拟光源轴向及其径向离焦对光斑的影响。结果表明,光源离焦对光斑辐照度平均值影响不大,但是对光斑辐照度的最大值、光斑辐照度分布形式、光斑面积有很大的影响。依据以上分析结果可以为太阳模拟器调焦系统方面的设计提供理论上的数据参考,对该类型的太阳模拟器装调也具有指导意义。     

一种新概念平行光管

提出一种基于波前径向斜率测量原理的适用于测量大口径成像光学系统像差的自基准新方法．用该方法毋需任何人工或天然的无限远目标或标准大平面反射镜提供测量基准．理论分析和实验结果表明，此方法的技术可行性强，波像差测量灵敏度与干涉法相当，而对工作环境和光源无苛刻要求，可用于特大口径光学系统，如航天遥感相机、天文望远镜和大口径抛物面镜等大型光学系统的像质检测，也可用于主动光学系统的波前传感．     

鱼眼镜头的光学系统设计

鱼眼镜头是一种焦距极短但视角很大的镜头.紧凑型鱼眼镜头光学系统的工作波段在可见光范围内,全视场为172°,能很好地解决广角镜头的轴外像差和边缘像面照度问题.设计的鱼眼镜头光学系统具有结构简单、体积小、成像质量好的特点.系统总长80.9 mm,后工作距离为18.8 mm.所选像元尺寸为12μm×12μm,像素数为1 280×1 024时,CCD对应的空间分辨力为27.2 lp/mm,边缘视场的MTF值最小,优于0.60.设计结果较理想.     

红外变焦距光学系统的研究

基于战场环境要求红外光学系统不仅可以兼顾大视场搜索,还能够满足小视场瞄准跟踪的需求,针对160×128元非制冷焦平面阵列探测器,设计了8~12μm波段折射式长波红外连续变焦系统。该系统变焦过程中相对孔径不变,F数为3,变倍比为15∶1,在20~300 mm范围内可连续变焦。用ZEMAX光学设计软件对设计结果进行像质评价,结果表明,系统的调制传递函数接近衍射极限,成像质量优良,满足光学系统的设计要求。     

基于软X射线成像菲涅耳波带片精确光学传递函数的离焦图像恢复

高分辨率软X射线显微成像已被广泛用于获得样品的三维结构.然而,焦深的受限问题导致样品投影图像离焦模糊,严重影响图像质量.提出了一种基于菲涅尔波带片的光学传递函数离焦图像的恢复方法.利用这种恢复方法,恢复了Siemens star测试板的离焦图像.结果表明,基于光学传递函数的恢复方法能够去除因离焦而造成模糊现象并且恢复由离焦引起的离焦图像.而且,相关的模拟说明这种方法可以真正用于解决X射线显微成像中焦深受限问题,完成样品的三维成像.     

光电信号采集中利用 FFT 实现快速、精确自动对焦

光电信号采集中利用ＦＦＴ实现快速、精确自动对焦程守澄孙新华（军械工程学院光学教研室石家庄０５０００３）在任何光电测试系统中，为获得准确的信号采集必须将光学信号像面精确定位在光电器件探测器表面。如果图像轴向偏离探测面即产生离焦现象，此时光电信号采集将出...     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

海南岛地体及其毗邻陆缘晚中生代—新生代古地磁研究和构造演化

本文叙述了对海南岛及其毗邻大陆边缘白垩纪到第四纪地层岩石进行古地磁研究的全部工作过程。通过分析岩石中剩余磁矢量的磁偏角及磁倾角的变化,提出海南岛白垩纪以来经历的构造演化模式如下:早期伴随顺时针旋转而向南迁移,后期伴随逆时针转动并向北运移。联系该地区及邻区的地质、地球物理资料,对海南岛上述的构造地体运动提出以下认识:北部湾内早期有一拉张作用,主要是该作用使湾内地壳显著伸长减薄,形成北部湾盆地。从而导致了海南岛的早期构造运动,而海南岛后期的构造运动则主要是受南海海底扩张的影响。海南地体运动规律的阐明对于了解北部湾油气盆地的形成演化有重要的理论和实际意义。     

Exciton Seebeck in Molecular Systems

Various applications relevant to the exciton dynamics,such as the organic solar cell,the large-area organic light-emitting diodes and the thermoelectricity,are operating under temperature gradient.The potential abnormal behavior of the exicton dynamics driven by the temperature difference may affect the efficiency and performance of the corresponding devices.In the above situations,the exciton dynamics under temperature difference is mixed with     

Achieving Unusual States of Matter Under High Pressure

The elongation method,originally proposed by Imamura was further developed for many years in our group.As a method towards O(N)with high efficiency and high accuracy for any dimensional systems.This treatment designed for one-dimensional(ID)polymers is now available for three-dimensional(3D)systems,but geometry optimization is now possible only for 1D-systems.As an approach toward post-Hartree-Fock,it was also extended to     

《Chinese Science Bulletin》SUBJECT INDEX TO VOLUME 59(2014)

正~~     

An on-line scaling method for improving scalability of a database cluster

The explosive growth of the Internet and database applications has driven database to be more scalable and available, and able to support on-line scaling without interrupting service. To support more client's queries without downtime and degrading the response time, more nodes have to be scaled up while the database is running. This paper presents the overview of scalable and available database that satisfies the above characteristics. And we propose a novel on-line scaling method. Our method improves the existing on-line scaling method for fast response time and higher throughputs. Our proposed method reduces unnecessary network use, i.e. , we decrease the number of data copy by reusing the backup data. Also, our on-line scaling operation can be processed parallel by selecting adequate nodes as new node. Our performance study shows that our method results in significant reduction in data copy time.     

An improved R-tree based on childnode''s probability

R-Tree is a good structure for spatial searching. But in this indexing structure,either the sequence of nodes in the same level or sequence of traveling these nodes when queries are made is random. Since the possibility that the object appears in different MBR which have the same parents node is different, if we make the subnode who has the most possibility be traveled first, the time cost will be decreased in most of the cases. In some case, the possibility of a point belong to a rectangle will shows direct proportion with the size of the rectangle. But this conclusion is based on an assumption that the objects are symmetrically distributing in the area and this assumption is not always coming into existence. Now we found a more direct parameter to scale the possibility and made a little change on the structure of R-tree, to increase the possibility of founding the satisfying answer in the front sub trees. We names this structure probability based arranged R-tree (PBAR-tree).     

An Index mechanism for multi-scale view in spatial databases

There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.     

Integrating GIS Web services based on mediating architecture

The geographic information service is enabled by the advancements in general Web service technology and the focused efforts of the OGC in defining XML-based Web GIS service. Based on these models, this paper addresses the issue of services chaining,the process of combining or pipelining results from several interoperable GIS Web Services to create a customized solution. This paper presents a mediated chaining architecture in which a specific service takes responsibility for performing the process that describes a service chain. We designed the Spatial Information Process Language (SIPL) for dynamic modeling and describing the service chain, also a prototype of the Spatial Information Process Execution Engine (SIPEE) is implemented for executing processes written in SIPL. Discussion of measures to improve the functionality and performance of such system will be included.