福建省十三届运动会新闻远程制作与共享系统设计的思考

随着网络技术的高速发展,探索一种高质量、高效率、低成本的新闻制作与传输系统成为各电视台的当务之急。本文浅述了福建省十三届运动会多家电视台联合采访报道中实现新闻素材的制作、共享及远程传输的设计与实践,提出了一种基于互联网为传输平台的低成本方式。     

发电厂风机状态趋势分析与寿命预测

采用最小二乘法,对电厂风机进行运行状态趋势分析与寿命预测：即通过监测设备的主要运行状态特征参数,分析设备的运行状态及趋势,建立了风机的寿命预测模型。采用面向对象开发语言Visual C＋＋接口与Matlab混合编程方法编制了风机趋势分析与寿命预测件系统。     

利用FAN算法进行组合电路的等价性检验

讨论了组合电路的等价性检验方法,分析了FAN算法的关键技术。利用该算法进行了组合电路的等价性检验,实验结果表明了该方法的有效性。     

一体式精简计算机电源的设计

讨论了采用一颗Fairch ild公司的电源转换芯片FAN5235,实现单电源输入、多电源输出的一种方法,其特点是集成度高、输入电压范围较宽、效率较高。讨论的硬件平台是目前应用较多的VIA C3 PLE133芯片组。     

基于 FAN5038 双电压控制器的 DSP 电源设计

FAN5038是FAIRCHILD半导体公司生产的低成本双路电压控制器。它具有两种电压输出功能，其中一路可为DSP提供主电源，另一路则可为各种I/O端口提供低压降的线性电压。文中介绍了FAN5038的主要特点、引脚功能和工作原理，给出了一个由FAN5038组成的、可为DSP和I/O分别提供4A和500mA输出电流的电源电路，同时给出了电路中两路电压的输出调节方法。     

基于双相同步PWM控制器FAN5240的CPU主电源电路

FAN5240是一种双相交叉同步补偿PWM控制器集成电路 ,可用来为高性能微处理器系统设计一个输出电压可编程的、高精度、大电流输出的电源系统。文章介绍了FAN5240的主要特点和功能结构 ,给出了由FAN5240组成的输出电压可编程的CPU主电源电路     

Influence of High Protein Digestibility Sorghums on Free Amino Nitrogen (FAN) Production during Malting and Mashing

In sorghum brewing, obtaining sufficient Free Amino Nitrogen (FAN) for rapid and complete fermentation remains a problem due to the high proportions of unmalted sorghum used and the poor digestibility of wet‐heat treated sorghum protein. Sorghum mutant lines with high protein digestibility have been developed through breeding. These high protein digestibility sorghums (HPDS) have protein bodies with villi‐like borders that apparently facilitate protease access. This work investigated FAN production from HPDS when malted and mashed, to assess their potential for use in sorghum brewing to improve wort FAN levels. When malted, HPDS contained substantially higher levels of FAN than normal protein digestibility sorghums (NPDS), 32 mg/100 g malt more. However, when the HPDS were mashed either as malt, or as grain or malt plus exogenous proteases, FAN production during mashing was not substantially higher than with NPDS subjected to the same treatments, only 6, 6–18 and 9–13 mg/100 g grain or malt, respectively. This is probably due to wet‐heat induced cross‐linking of the kafirin proteins reducing their susceptibility to proteolysis. Notwithstanding this, HPDS could be very useful for improving FAN levels in sorghum brewing if they are malted.     

Influence of grapevine leafroll associated viruses (GLRaV-2 and -3) on the fruit composition of Oregon Vitis vinifera L. cv. Pinot noir: Free amino acids,sugars, and organic acids

Individual free amino acids, yeast assimilable amino acid (YAN) content, ammonia, organic acids, and simple sugars of berries from vines infected with GLRaV-2 or -3 were compared with paired vines free of these viruses. Samples were taken from two commercial vineyards during two growing seasons (2005 and 2006), with three different rootstock/scion combinations. Vines infected with GLRaV-2 did not differ significantly from their healthy counterparts in individual free amino acids, ammonia, or YAN content. Vines infected with GLRaV-3 were significantly lower in valine and methionine from Vitis riparia rootstock/‘Pinot noir’ clone 114 (VY2a) samples, and lower in glutamic acid from self-rooted/‘Pinot noir’ clone Pommard (VY2b) samples, compared to samples from their healthy counterparts. Samples from VY2b (self-rooted/‘Pinot noir’ clone Pommard) infected vines had significantly lower levels of malic acid and total organic acids compared to samples from their healthy counterparts. There were no significant differences between healthy and infected vines from all three rootstock/scion pairs in ammonia or free amino acids in samples taken during the weeks before ripening and at commercial harvest. This is the first study to report the influence of GLRaV-2 and -3 on ‘Pinot noir’ berries nitrogen (N) compounds significant to fermentation. Individual free amino acids may be inferior to phenolic compounds as indicators of GLRaV infection status.     

Flow‐Based QoS Management Architectures for the Next Generation Network

At the extremes of the complexity‐performance plane, there are two exemplary QoS management architectures: Integrated Services (IntServ) and Differentiated Services (DiffServ). IntServ performs ideally but is not scalable. DiffServ is simple enough to be adopted in today's core networks, but without any performance guarantee. Many compromise solutions have been proposed. These schemes, called quasi‐stateful IntServ or stateful DiffServ, however, have not attracted much attention due to their inherently compromising natures. Two disruptive flow‐based architectures have been recently introduced: the flow‐aware network (FAN) and the flow‐state‐aware network (FSA). FAN's control is implicit without any signaling. FSA's control is even more sophisticated than that of IntServ. In this paper, we survey established QoS architectures, review disruptive architectures, discuss their rationales, and points out their disadvantages. A new QoS management architecture, flow‐aggregate‐based services (FAbS), is then proposed. The FAbS architecture has two novel building blocks: inter‐domain flow aggregation and endpoint implicit admission control.     

采用PFC和PWM组合控制器FAN4803设计的直流开关电源电路

FAN4803是快捷半导体公司为大功率直流开关电源应用而设计的控制芯片 ,该芯片将功率因数校正 (PFC)和脉冲宽度调制PWM功能集成在一起 ,同时具有功能多、效率高、谐波失真小以及欠压锁定、过压保护、峰值电流限制等功能 ,并可最大限度地减小EMI电磁干扰。文中介绍了FAN4803的主要特点、引脚功能和内部结构 ,给出了一个用PFC和PWM组合控制的240W/12V直流开关电源的实用电路