Fast macroblock mode selection algorithm for multiview depth video coding

<正>Huge computational complexity of multiview video plus depth(MVD) coding is an obstacle for putting MVD into applications.A fast macroblock mode selection algorithm is proposed to reduce the computational complexity of multiview depth video coding.The proposed algorithm,implementing on a joint coding scheme,combines an effective prediction mechanism and an object boundary discriminating method.The prediction mechanism which is designed based on the macroblock mode similarities reduces the number of macroblock mode candidates in depth video coding.The object boundary discriminating method extracts the regions,which are with discontinuous depth values and important for virtual view rendering,by using macroblock deviation factor.Experimental results show that the proposed algorithm can significantly promote the coding speed of depth video by 2.00-3.40 times,while maintaining high rate distortion(RD) performance in comparison with the full search algorithm.     

Electronic and magnetic properties of semihydrogenated,fully hydrogenated monolayer and bilayer MoN_2 sheets

Based on density functional theory, we investigate the electronic and magnetic properties of semi-hydrogenated, fully hydrogenated monolayer and bilayer MoN_2. We find that the AB stacking bilayer MoN_2 exhibits ferromagnetic coupling of intralayer and antiferromagnetic coupling of interlayer, however, the ground states of the semi-hydrogenated, fully hydrogenated monolayer and AA stcaking bilayer MoN_2 are nonmagnetic. The fully hydrogenated system has a quasidirect band-gap of 2.5 eV, which has potential applications in light-emitting diode and photovoltaics. The AB stacking bilayer MoN_2 shows the Dirac cone at K point in BZ around Fermi energy. Furthermore, the interlayer of the AB stacking bilayer MoN_2 is subjected to a weak van der Waals force, while the interlayer of the AA stacking forms N-N covalent bond.     

反铁磁粒子的势助量子隧穿和宏观量子效应

用周期瞬子方法研究了反铁磁粒子中激发态量子隧道效应.给出了各种低激发态下的隧穿幅、能级分裂以及前置因子.用统计平均得到给定温度下的隧穿率.理论计算的隧穿率随温度的变化关系与实验结果相符. 关键词：     

合金的维生素──钒

随着材料科学的发展,金属钒及其化合物得到了越来越广泛的应用,并被誉为"合金的维生素".在未来的发展中,钒及其化合物将成为更加重要的稀有金属.本文介绍了钒的发现、分布、制备、性质及应用,并概述了钒与人体健康的关系.     

KT-D型银盐全息干版曝光特性的研究

本文首先对用KT-D型银盐全息干版记录的全息图的曝光特性进行了实验研究,获得了全息图的衍射效率与曝光能量的关系曲线。然后应用Kogelnik的耦合波理论测算出乳胶折射率及其调制度的曝光特性,对其折射率调制机理作出必要的理论分析,并获得了KT-D型全息干版的性能参数。     

无需标准溶液的酸碱滴定计算分析研究

无需标准溶液的滴定计算分析能同时求出滴定剂与被测物质浓度.本文用非线性规划问题的单纯形加速法对无需标准溶液的酸碱滴定进行了研究.单元酸、多元酸及混合酸的测定得到了比较满意的结果.     

丁腈羟增韧环氧树脂研究——Ⅰ.端异氰酸酯基预聚物法

丁腈羟液体聚合物和甲苯二异氰酸酯反应生成端异氰酸酯基预聚物,加入到环氧树脂中,得到性能良好的增韧树脂。用扭辫仪测定了它的动态力学性能,表明有两个损耗峰。透射电镜照片显示有两相结构,预聚物用量为30Phr时,发生明显的相倒转,从固化机理解释了这种现象。     

高效液相色谱中的化学衍生法

色谱技术中的化学衍生法系指在色谱过程中用特殊的化学试剂(一般称为衍生化试剂或标记试剂)使样品成分转变相应的衍生物之后进行分离检测或进行检测的方法。近十年来,化学衍生法在高效液相色谱法中的应用受到重视,发展较快。在高效液相色谱法中,化学衍生化的目的为:1.将紫外一可见强吸收功能基团引入被检测对象或将其转变为荧光衍生物,以提高检测灵敏度;2.提高对分析样品的分离和选择性。     

端羧基液体聚氯丁二烯的合成、表征及对环氧树脂的增韧作用

用过氧化环已酮-硫酸亚铁引发体系,同时连续加入氯丁二烯单体和引发剂,乳液聚合得到端羧基液体聚氯丁二烯,经IR和NMR证明氯丁二烯单元以反1,4-结构,头-尾方式相连接。这种液体橡胶对环氧树脂有一定增韧效果。     

对-乙酰基偶氮胂作淋洗剂阳离子交换分离及光度测定钍与稀土(铀、钪)

本文提出用显色剂--对-乙酰基偶氮胂作淋洗剂,阳离子交换分离钍与稀土(铀、钪),流出液可直接用光度法测定,将分离和测定结合起来的新方法.操作较简便快速.分离测定了矿石中稀土及钍,结果尚属满意.