实现数字电视高清与标清EPG共存

本文介绍了在数字电视系统中开展高清业务,使用高清与标清电子节目指南（EPG）共存的办法来达到不影响原有标清用户正常搜索与收看的目的,从而使得两项业务都可以顺利地开展和推广.     

NIT理念下高职计算机基础考试改革探究

考试是教学过程中非常重要的环节。合NIT考试的特点，从考试方式、考试内容、考试的改革方法。本文指出了当前计算机基础考试中存在的问题，并结考试方法、创新能力考核等多方面提出了计算机基础     

数字电视区域控制技术实践

本文结合运城市级SDH传输网络的实际,对数字电视区域控制技术的概念、原理及实现路径进行了深入探讨.     

Possibilities of using near infrared reflectance/transmittance spectroscopy for determination of polymeric protein in wheat

Possibilities of using near‐infrared reflectance and near‐infrared transmittance (NIR/NIT) spectroscopic techniques for detecting differences in amount and size distribution of polymeric proteins in wheat were investigated. To evaluate whether differences in polymeric protein due to genetic or environmental variations were detectable by NIR/NIT techniques, wheat materials of different background were used. Size‐exclusion high‐performance liquid chromatography was applied to detect variation in polymeric protein. Partial least squares regression gave high R² values between many protein parameters and NIR/NIT spectra (particularly second‐derivative spectra of NIR 1100–2500 nm region) of flours, while no such relationship was found for whole wheat grains. Most and highest correlations were found for total amount of extractable and unextractable proteins and monomer/polymer protein ratio. Some positive relationships were found between percentage of total unextractable polymeric protein in the total polymeric protein and percentage of large unextractable polymeric protein in the total large polymeric protein and NIR/NIT spectra. Thus, it was possible to detect differences in polymeric proteins with NIR/NIT techniques. The highest amount of positive correlations between NIR/NIT spectra and protein parameters was found to be due to environmental influences. Some correlations were found for breeding lines with a broad variation in gluten strength and polymeric protein composition, while a more homogeneous sample showed less correlation. Thereby, detection of variation in amount and size distribution of polymeric protein due to cultivar differences with NIR/NIT methods might be difficult. Copyright © 2007 Society of Chemical Industry     

数字电视NIT表的研究及在DVB-C中的应用

通过对网络信息表(NIT)段、描述子的语法进行研究,分析了其主要功能,并结合工程实践,叙述了NIT在有线数字电视的应用.     

南通数字电视分区域管理的实现

根据南通市的实践,阐述了如何实现传输区域管理必需的信号差异.比较了分区域管理的实现方案,分析了各方案的特点和能达到的控制程度,以及智能卡分区域管理中对机顶盒提出的功能性要求.     

数字电视区域控制技术的研究与实现

区域控制技术是数字电视发展到一定阶段后必须要面对的问题和要实现的技术。本文介绍数字电视发展中的区域控制技术的概念、所涉及的技术环节以及如何实现区域控制的技术解决方案,供各位同行参考。     

印制电路板(PCB)的红外热像诊断技术

印制电路板(PCB)的故障诊断与维修是现代武器装备维护过程中十分重要的环节，红外热像诊断作为一种新兴的PCB非介入式故障诊断技术，受到了越来越广泛地关注。本文介绍了PCB红外热像诊断的基本原理和现代红外热像诊断系统的基本构成，探讨了热源辨识、热信息校准、特征提取和智能故障定位等关键技术，并提出了今后的研究方向。     

对现有数字电视区域锁定技术的分析比较

数字电视区域锁定技术是伴随着数字电视发展和推广而产生的一项新技术,各地运营商在具体实施过程中采用了不同的实现方式,通过对现有已实施的几种区域锁定技术实现方式的描述与分析对比,为各地运营商提供符合自身实际的实现区域锁定的方式方法。     

Assessment of maximum cooking temperatures in previously heat treated beef. Part 1: Near infrared spectroscopy

Near infrared diffuse reflectance (NIR) and transmittance (NIT) spectroscopy were studied as potential methods for determination of the previous heat treatment of beef. Ninety-four samples of M longissimus dorsi from 33 bulls were heat treated at nine different temperatures between 50 and 85°C, and analysed by NIR and NIT spectroscopy. The samples were analysed by NIR and NIT in both ‘wet’ and freeze dried states. The NIR and NIT methods were able to determine the maximum temperature of previously heat treated beef with a prediction error of 2.0-2.1°C in the temperature range 50–85°C. Freeze drying of the samples prior to analysis reduced the prediction error to 1.4°C for the NIR method. NIR and NIT should be useful as fast screening methods to determine whether beef has been adequately heat treated.