一种全息体视图重现方法的研究

计算全息中采用基于衍射的光栅条纹生成方法,将视场分为连续的8个区域,每个区域由一个空间频率不同的基本条纹衍射生成,并利用规则照相机几何获取的空间透视体生成的对极平面图,用计算全息与图像处理技术产生一个全息立体图,实现简单景物具有3D视差效果体视重现。     

计算机与光学相结合的体视全息三维显示

在计算机制全息技术和光学全息技术的基础上,研究用计算机-光学方法联合制作体视全息三维立体显示技术.根据人眼立体视觉原理获取三维物体带有视差信息的体视图,通过计算机计算得到计算全息图H1;将H1严格对位,用激光再现获得带有视差信息的再现像,并以此再现像为对象,用光学全息的方法拍摄彩虹全息图H2;用白光再现H2,通过双眼综合出三维立体图像.在全息图的计算过程中,采用快速傅里叶变换算法提高了计算速度,将计算全息与光学全息相结合,发挥了各自的优势.     

菲涅耳全息图的计算机生成及数字重现

本文研究菲涅耳(Fresnel)衍射积分的两种计算机模拟算法,分别用卷积算法和傅里叶变换算法实现菲涅耳积分,阐述了两种算法的优点和缺点。尝试将计算全息与数字全息相结合,模拟光线的菲涅耳衍射传播,用计算机生成菲涅耳全息图,并由所生成的全息图再现出原始图像,完成全息图的数字重现,真正实现整个全息记录和重现过程的计算机模拟。     

装配式钢混组合梁全息图像拼接方法试验研究

针对传统桥梁监测方法存在测点数量有限的问题,提出一种通过摄影测量手段获取桥梁全息几何形态信息的方法,以进行对全桥任意点变形监测。首先采用形态图像数据采集系统获取试验梁具有重复区域连续照片,然后基于改进后SIFT算法对连续图片进行拼接可得试验梁全息图片,进而获取试验梁全息几何形态,最后基于全息形态位移信息追踪算法提取试验梁各工况下的全息变形曲线。通过与传统位移计测量结果和基于SIFT算法拼接而得位移结果进行对比发现：基于改进后SIFT算法实现的拼接图像包含信息丰富,可为大尺度结构大视场应用情况下全息几何形态监测奠定基础。     

用液晶空间光调制器实现动感合成全息

提出了一种基于液晶空间光调制器实现合成全息动感的新方法．首先根据人眼双眼视差立体视觉原理获取三维物体的二维体视对阵列，由计算全息方法得到每一视角的一对体视图的合成全息图并顺序存储，再现时由计算机控制将合成全息图阵列以一定频率输出到液晶空间光调制器，通过光路分离左右视图再现像，从而使人眼观察到动感的立体图像．该方法由计算机控制全息图分时输出再现代替空间面积分割方法，相比传统的合成全息来说。实现的方法灵活，易于操作．     

一种新的测定流体质扩散系数的全息干涉图像处理方法

将基于傅里叶变换的相位检测原理应用于流体质扩散系数测量中的图像数据处理,提出了一种新的流体质扩散激光全息干涉条纹图像的处理方法．该方法由小波变换去噪、频域窗口滤波、全息图物像再现及最小二乘法相位展开等步骤组成．采用该方法对实验中采集的标准体系0．33mol／L KC1溶液在298．15K下与水的质扩散干涉条纹图像以及在不同温度下0．1mol／L蔗糖水溶液-水扩散系的扩散干涉条纹图像进行了处理,并通过与文献值的比较验证了该方法的准确性．该方法充分利用了全息图的相位信息,进一步提高了处理实验数据的精度,通过误差分析可知其理论精度可以达到0．1％,从而可为激光全息干涉法测量流体质扩散系数实验提供新的手段．     

菲涅耳计算全息干涉图的制作及模拟再现的研究

应用matlab语言,结合菲涅耳衍射原理,利用计算机绘制了菲涅耳全息图,实现了计算全息图的快速制作,并详细地讨论了制作计算全息图的原理、方法和步骤.将CGH技术和数字全息技术相结合,由所生成的全息图再现出原始图像,完成了全息图的数字重现,实现了整个全息记录和再现过程的计算机模拟.较传统的编程语言和绘图方法,该算法实现上更加简单和快捷,并且带有一系列提高计算全息图质量的措施,获得了清晰的数字再现图像.     

计算机制二维全息图的研究

结合二维平面图像的特点,提出了用快速傅里叶变换制作菲涅耳计算全息图的快速算法：将菲涅耳衍射光波表示成傅里叶变换的形式,编写计算程序,用快速傅里叶变换进行计算;并研究了傅里叶变换算法中衍射场的取样间隔与计算全息系统取样间隔的关系,给出了理论分析与实验结果．     

视差图误差检测与校正的通用快速算法

为了获取精确的立体匹配结果 ,提出了一种通用的视差图误差检测与校正算法。算法首先定义一个新的全局顺序匹配约束 ;然后将其用于视差图后处理过程 (而不是视差计算过程 )中 ,以检测出视差图中的匹配交叉区域 ;最后提出一种零交叉校正方法 ,校正其中的误匹配点。通过对一组真实立体图像序列及其视差图的实验 ,进一步证明了该算法的有效性。该算法可以作为视差图后处理过程附加在各种立体匹配算法之后     

使用图像分割的遮挡恢复立体匹配算法

针对立体匹配在稀疏纹理、重复纹理、深度不连续和遮挡区域存在的问题,提出了一种高效的立体匹配算法.该算法主要由像素匹配代价计算和视差图全局优化2个步骤组成.为了大幅减少当前算法在场景深度不连续处所产生的过渡平滑现象和在稀疏纹理处产生的错误匹配,采用基于图像采样噪声无关的自适应权重加窗匹配算法.为了求解遮挡区域和不连续性区域的像素视差,使用遮挡和平滑惩罚代价来约束整幅视差图,并采用基于图像分割的能量最小化方法求取最优解.实验结果表明,相比于局部和全局算法,该算法可以更快且准确地计算稀疏纹理、不连续性和遮挡区域的像素视差.     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

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.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

A computer generator for randomly layered structures

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

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.     

Jane Eyre——A Feminist In The 19th Century

In the 19th century the society was controlled by men, and women were just appendants of them, they had not any rights and freedom. But Jane was an exception, she showed some characteristics of early feminist. Jane showed her characteristics of feminism in three aspects: rebellion, equality, and independence. These characteristics were helpful to her success, and feminism is the only way out for women of that time.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-