Cross‐talk acceptability in natural still images for different (auto)stereoscopic display technologies

Abstract— One of the most annoying distortions in (auto)stereoscopic displays is probably cross‐talk, visible as double edges, which is mainly caused by an imperfect separation of left‐ and right‐eye images. For different types of three‐dimensional (3‐D) displays, cross‐talk is caused by different origins, which could result in different levels of perceived image distortion. To evaluate the influence of (auto)stereoscopic display technology on cross‐talk perception, optical measurements and subjective assessments were performed with three different types of 3‐D displays. It is shown with natural still images that the 3‐D display technology with the lowest luminance and contrast level tolerates the highest level of cross‐talk, while still maintaining an acceptable image‐quality level.     

Elastic properties of As-Sb-Se glasses

Results of measurement of elastic modulii on As-Sb-Se glasses are reported and their composition dependence discussed. The Young’s and the shear modulii lie in the range of 170–210 and 65–80 kb respectively. These values are typical of chalcogenide glasses. For (As, Sb)₄₀Se₆₀ glasses, the modulii increase monotonically with increasing Sb₂Se₃ content. The observed composition dependence of the modulii for the As _x Sb₁₅Se_{85 −x} glasses is examined in terms of the chemically ordered structural units in the glasses.     

鸟撞飞机前风挡动态响应的数值模拟

利用Ansys/Ls-Dyna非线性三维有限元程序,模拟计算鸟撞飞机前风挡的动态响应。模拟结果表明,鸟撞是毫秒级的冲击过程,由于应力波的反射、叠加,后弧框中间位置可能首先发生破坏;对于另外一种不对称风挡结构,尽管撞击过程中缺口处首先产生较大的应力值,但并不会给临界速度带来明显的降低,可为新型风挡结构设计提供参考。     

Stress formation in evaporated amorphous Ge-Se and Ge-Se-Ga(Tl, B) thin films

Thin amorphous chalcogenide films from the GeSe_x (x = 1-5), (GeSe₄)_100−yGa_y and (GeSe₅)_100−y Ga(Tl, B)_y (y = 5, 10, 15, 20) systems have been prepared by thermal evaporation and characterized with respect to their internal stress using a cantilever technique. The correlations between the stress, the composition and the structure of the films were investigated. The obtained results were related with some structural and mechanical parameters of the glasses like mean coordination number, number of constrains per atom, density, compactness, microhardness and Young's modulus. For all investigated chalcogenide films a stress relaxation with the time was observed as a result of spontaneous structural rearrangements.     

Phase transition in the Zr60Al15Ni25 bulk metallic glass subjected to rolling at room temperature

The microstructure evolution of the Zr₆₀Al₁₅Ni₂₅ metallic glass during rolling at room temperature is investigated by X-ray diffraction (XRD), differential scanning calorimetry (DSC) and high-resolution transmission electron microscopy (HREM). The results show that the values of full width at half maximum (FWHM) of the XRD patterns and exothermic enthalpy ΔH of DSC plots do not monotonically change with the variation of deformation degrees ɛ. As ɛ is not large than 20%, the values of FWHM and ΔH are lower than that of the as-cast state. When ɛ reaches 30%, the values of FWHM and ΔH become larger than that of the as-cast state, while their values begin to decrease again as ɛ reaches about 85%. These results indicate that the reversible transitions between ordered and disordered atomic configurations occur during rolling, which is further verified by the HREM images. The reversible phase transition can be explained by the competition between the diffusion controlled reordering and shear-induced disordering during rolling.     

硼铝酸锶长余辉发光玻璃的制备及发光性能研究

采用一步合成法制备了硼铝酸锶长余辉发光玻璃,系统研究了热处理温度、热处理时间、冷却制度等条件对长余辉玻璃发光性能的影响.结果表明:在N2气氛下,热处理温度为1300℃、保温时间为3h、试样随炉冷却的制备工艺可得到发光性能优良的长余辉玻璃,该玻璃的长余辉特性源自在玻璃基体中均匀分布的Eu2 、Dy3 共掺杂的SrAl2O4微晶.     

Sm2O3掺杂磷酸盐玻璃的形成及热稳定性

借助DSC分析手段,系统研究了稀土掺杂磷酸盐玻璃的形成及其影响因素,结果表明,当玻璃结构中[PO4]/[AlO4]≥2时易于形成均质透明的玻璃,形成区域范围为P2O5含量50%～85%(摩尔分数),BaO含量10%～40%(摩尔分数),Al2O3含量0%～17.5%(摩尔分数),Sm2O3含量0%～20%(摩尔分数);Al2O3含量增加,玻璃的形成能力增强,Sm2O3含量的增加使得玻璃的形成能力先增大后减小.     

Observation and computer simulation of multicomponent chemical short-range order （MCSRO） for the bulk metallic glasses

The atomic configuration of chemical short-range order (CSRO) for the Zr-base metallic glasses was investigated by using nano-diffraction and high resolution transmission electronic microscopy (HRTEM) technology with a beam size of 0.5 rim. It is illustrated that the pattern of atomic configuration of CSRO might have various compound counterparts because of the chemical interaction of bonding atoms. Some atomic configuration of MCSRO is similar to the icosahedral structure with 10-fold symmetry of very weak spots. In deed, the nano-beam technology could clearly detect the evolution of atomic configuration in nanometer scale during the transformation from the metallic melt to the primary crystallization. The local atomic configuration of CSRO is also investigated by molecular dynamics simulation (MD) for the Zr2Ni compound in a wider temperature range. The CSRO in the melt could be pictorially demonstrated as distorted coordination polyhedron of the compound structure and/or the structure similar to cubo-octahedron analogs. The MD simulation illustrates that the atomic packing of long-range order disappears just above the melting point, but the chemical interaction of bonding atoms still exists that leads to form the various CSRO with the atomic configuration similar to stable or metastable unit cell of Zr2Ni compound. The icosahedral polyhedron became more abundance as the overheating temperature was raised.     

Properties and Microstructure of GeS_2-Ga_2S_3-CdS Glasses

1Introduction OsterbergUetal[1]firstlydetectedtheSecond Har monicGeneration(SHG)bythelaser inducedmethodin GeO2SiO2glassfiber,andMyersRAetal[2]observed SHGeffectinSiO2bulkglassesafterpolarizationwitha strongelectronicfield.Sincethenthescholarsalloverthe w…