Addition of pectolytic enzymes: an enological practice which improves the chromaticity and stability of red wines

Summary The effect of the addition of four commercial pectolytic preparations on the visual characteristics (colour and turbidity) of red wines has been evaluated. The effect of both clarifying and colour extracting enzymes and the effect of different doses used, were evaluated and compared. All the red wines treated enzymatically, independent of the type of enzyme and dose, present chromatic characteristics which can be considered better than those of the control wines. Also, those wines treated with enzymes had greater stability during 2 years storage in bottles, in particular the turbidity was better than untreated wines.     

A Family of Far‐Infrared‐Transmitting Glasses in the Ga–Ge–Te System for Space Applications

Conditions of formation of bulk tellurium chalcogenide glasses, containing 70–80 at % Te associated to Ga and Ge are described. The characteristic temperatures are measured: the glass‐transition temperature, T_g, is situated in the range 140–185 °C and the difference T_x – T_g, where T_x is the onset crystallization temperature, is in the range 76–113 °C. Moreover, the optical transmission window is exceptional, ranging from 1.99 μm in the bandgap up to 28 μm in the phonon region. Developed within the framework of requirements for the Darwin mission (a search for and study of extrasolar planets), feasibility of infrared optical fibers formed from these glasses is studied. Drawing experiments are conducted with the glass Ga₂‐Ge₃Te₁₅, which possesses the maximum T_x – T_g, and a first optical fiber is presented.     

Microstructural Effects of Ion Implantation on Molybdenum

The effects of ion implantation and subsequent annealing on the microstructure of molybdenum have been investigated by transmission electron microscopy. The ions investigated were carbon, nitrogen, and tellurium. The ion-induced damage was found to give rise to grain boundary migration phenomena both during implantation and during subsequent annealing. Precipitation or ordering was found to occur for each ion on annealing.     

对数正态概率纸的自动生成和分布参数的自动提取

采用对数正态概率纸可以直观地判断一组数据是否服从对数正态分布，而且还可以得到对数正态分布参数，即对数均值和对数标准差。介绍对数正态概率纸自动生成和分布参数自动提取的方法以及据此开发的软件。与手工使用概率纸的常规方法相比，采用所开发的软件不但使用简单、方便，而且能提高计算结果的精度。     

紫苏中迷迭香酸的乙醇提取优化实验研究

研究了采用乙醇提取法从紫苏中提取迷迭香酸的工艺条件。方法采用正交实验L9（3^4）优化迷迭香酸乙醇浸提法的提取工艺，硫酸亚铁比色法测定迷迭香酸含量。确定了最佳工艺条件为：50％乙醇为提取剂，料液比为1：50（w／v），提取温度为65℃，提取时间为35min，迷迭香酸提取率为1．061％比热水浸提法提高了30．18％。     

微波辐射在提金活性炭技术中的应用

概述了微波辐射在提金活性发技术中的应用，将微波辐射和传统方法制备提金炭技术进行了比较，论述了微波辐射在制备提金炭及其解吸技术中的研究进展，最后对微波辐射在提金活性炭技术中的应用作了简单的展望。     

氢化物原子荧光法直接测定地质样品中痕量硒和碲

研究了采用氢化物原子荧光法同时对硒、碲进行直接测定的条件，拟定了适合于一般地质样品中痕量硒和碲的分析方法。     

基于音频数字水印的空间定位技术研究

深入研究了利于音频数字水印实现空间定位的技术思想,提出了一种在数字音频中嵌入水印信息后,实现对声源的空间定位算法,详细阐述了该算法的设计思想,并分别给出了音频数字水印的嵌入过程和数字水印的提取过程。     

基于灰度共生矩阵的图像纹理特征提取分析

图像纹理作为一种重要的视觉手段,是图像中普遍存在而又难以描述的特征。目前常用的纹理特征提取的方法主要有统计方法、模型方法、信号处理方法和结构方法。灰度共生矩阵即为灰度级的空间相关矩阵,以其为基础的统计方法通过对矩阵统计量的求取较好地提取到了纹理特征,通过选取关键参数编程并进行仿真实现,分别求取了四个方向的灰度共生矩阵及其特征量来分析图像的纹理特征。     

冲压件CAPP系统中几何信息提取实现

基于对AutoCAD的DXF文件格式的详细分析，充分利用多义线的表达简洁性优点，并结合冲压件自身特点，提出了冲压件几何信息获取的方法及程序框架，详细说明了几何信息库的创建方法，并进一步采用Delphi6．0语言编程，实现了冲压几何信息库的建立和几何信息自动提取。