古代西夏活字印本考是现存世界上最早的活字印刷品,然而由于活字聚版不精或活字不规范而造成的字形歪斜、字列不正,对活字印刷术的鉴别研究是一种莫大的考验.针对上述问题,提出一种基于图像配准技术的西夏文活字鉴别方法.该方法首先提...古代西夏活字印本考是现存世界上最早的活字印刷品,然而由于活字聚版不精或活字不规范而造成的字形歪斜、字列不正,对活字印刷术的鉴别研究是一种莫大的考验.针对上述问题,提出一种基于图像配准技术的西夏文活字鉴别方法.该方法首先提取字符图像的边缘特征点,然后根据仿射迭代最近点(iterative closest point,ICP)算法的配准结果来度量字符图像的形状相似性,并在此基础上建立一个连接相似图像的启发树结构,最后通过一致点漂移(coherent point drift,CPD)方法完成图像的非刚体配准.该配准结果能有效地实现西夏文的活字印刷术的鉴别,实验结果表明,与最新方法相比,本文算法具有精度高的特点.展开更多
The etching of ABS plastic surface in ultrasonic field has been studied by using uniform design. A mathematicalequation to relate the roughness of ABS plastic surface with various etching parameters has been found and...The etching of ABS plastic surface in ultrasonic field has been studied by using uniform design. A mathematicalequation to relate the roughness of ABS plastic surface with various etching parameters has been found and the ultrasonicetching process has been optimized. The characterization of samples has been studied by SEM.展开更多
文摘古代西夏活字印本考是现存世界上最早的活字印刷品,然而由于活字聚版不精或活字不规范而造成的字形歪斜、字列不正,对活字印刷术的鉴别研究是一种莫大的考验.针对上述问题,提出一种基于图像配准技术的西夏文活字鉴别方法.该方法首先提取字符图像的边缘特征点,然后根据仿射迭代最近点(iterative closest point,ICP)算法的配准结果来度量字符图像的形状相似性,并在此基础上建立一个连接相似图像的启发树结构,最后通过一致点漂移(coherent point drift,CPD)方法完成图像的非刚体配准.该配准结果能有效地实现西夏文的活字印刷术的鉴别,实验结果表明,与最新方法相比,本文算法具有精度高的特点.
文摘以不同质量浓度的维生素C为阳性对照,研究鲜榨紫色胡萝卜汁体外抗氧化活性,并与橙色胡萝卜汁和白色萝卜汁做对比。分别采用Folin-酚法和p H示差法测定了紫色胡萝卜汁的花青素含量和总酚含量。结果表明,紫色胡萝卜汁体外对·OH、H2O2、O2-·具有较高的清除率,橙色胡萝卜汁和白萝卜汁对·OH、H2O2的清除率较紫色胡萝卜汁低,且对O2-·几乎无清除作用。鲜榨紫色胡萝卜汁中总酚含量23.90 mg/m L,花青素含量287.62 mg/L。0.1 m L稀释5倍的紫色胡萝卜汁对·OH的清除率为50.74%,相当于质量浓度为3 100 mg/L的维生素C对·OH的清除率;0.5 m L稀释15倍的紫色胡萝卜汁对H2O2的清除率为56%,相当于700 mg/L维生素C的清除率;1.5 m L稀释20倍的紫色胡萝卜汁对O2-·的清除率为51.85%,相当于40 mg/L维生素C对O2-·的清除率。
文摘The etching of ABS plastic surface in ultrasonic field has been studied by using uniform design. A mathematicalequation to relate the roughness of ABS plastic surface with various etching parameters has been found and the ultrasonicetching process has been optimized. The characterization of samples has been studied by SEM.
