F 型广义Z -矩阵与M -矩阵的几个性质

定义了一种新型广义Z -矩阵和广义M -矩阵, 并给出了几个F 型广义Z -矩阵和F 型广义M -矩阵的重要性质。F 型广义M-矩阵不仅包括了M-矩阵, 还包括了所有的正矩阵。若非对角元是非正的, 则矩阵A∈ R^{n ×n}称为Z -矩阵。当且仅当A 是Z -矩阵同时也是P -矩阵时, A∈ R^{n ×n}称为M -矩阵。对一个方阵进行均分块, 若所有的小方块都是Z -矩阵, 则称此方阵为F 型广义Z -矩阵。对一个方阵进行均分块, 若所有的小块都是M-矩阵, 则称此方阵为F 型广义M -矩阵。得到了F 型广义M-矩阵的一些性质。若M , N ∈ R^{n ×n}皆为相同分类F 型广义M -矩阵, 则在广义FAN 积定义下, M ＊N仍为一个该分类的F 型广义M -矩阵。任意一个F 型广义M -矩阵只有唯一的分法使它成为F 型广义M -矩阵。这些性质为更好的解广义线性互补问题奠定了一定的基础。     

基于新型控制器FAN7710V的CFL镇流船

FAN7710V是一种集成了CFL控制器和半桥MOSFET的组合IC。FAN7710V在310V的DC电压上为CFL交付20W的功率,并具有预热／触发功能。FAN7710V在点火后通过内部有源零电压开关（ZVS）电路检测开关操作,并能检测灯开路情况。该文介绍了基于FAN7710V的CFL镇流器原理与设计。     

锅炉风机节能降噪新技术的应用

针对采暖锅炉的噪声污染和能耗，从实用性、安全性、经济性等方面提出改进的方案，进行综合治理，并达到了预期效果。     

基于控制器FAN7387的荧光灯与HID灯镇流器

FAN7387是一种荧光灯、HID灯镇流器和普通半桥逆变器、开关电源(SMPS)简单控制器.该文介绍了FAN7387的功能、特点和基于FAN7387的电子镇流器电路.     

Feasibility study on the use of attenuated total reflectance mid‐infrared spectroscopy for the analysis of malt quality parameters in wort

The feasibility of using attenuated total reflectance in combination with mid‐infrared (MIR) spectroscopy for the analysis of malt quality parameters in wort, such as free α‐amino acid (FAN), apparent attenuation limit (AAL), soluble protein (SP) and viscosity (VIS), was evaluated. The coefficients of determination in cross‐validation and the standard error of cross‐validation were 0.81 and 10.3 mg L^?1 for FAN, 0.80 and 1.49% for AAL, 0.78 and 0.18% for SP and 0.69 and 0.13 cP for VIS. Good calibration and validation statistics were obtained for AAL. However, for nitrogenous compounds the MIR predictions can only be used as approximate estimates of the true concentrations, for example to rank samples (low, medium, high) in the context of a breeding programme. Copyright © 2014 The Institute of Brewing & Distilling     

Corn grist adjunct – application and influence on the brewing process and beer quality

In the brewing industry, barley malt is often partially replaced with adjuncts (unmalted barley, wheat, rice, sorghum and corn in different forms). It is crucial, however, to preserve constant quality in the beer to meet the expectations of consumers. In this work, how the addition of corn grist (10 and 20%) influences the quality of wort and beer was examined. The following parameters were analysed: wort colour, dimethyl sulphide (DMS) and protein content, non‐fermentable extract, extract drop during fermentation, alcohol content and the attenuation level of the beer, together with filtration performance. The samples (all‐malt, and adjunct at 10 and 20% corn grist) were industrial worts and the beers produced in a commercial brewery (3000 hL fermentation tanks). The application of 10 and 20% corn grist had an effect on the wort colour, making it slightly lighter (11.1 and 10.5°EBC, respectively) than the reference barley malt wort (12.2°EBC). The free amino nitrogen level, DMS and non‐fermentable extract were significantly lower in the worts produced with the adjunct; the alcohol content and attenuation levels were higher in the beers produced with adjunct. The use of corn grist, at the level of up to 20% of total load, appears to affect some of the technological aspects of wort and beer production, but it does not significantly influence the final product characteristics. Copyright © 2014 The Institute of Brewing & Distilling     

可调压调光紧凑型节能灯电子镇流器的设计

针对集总式调光照明系统的要求,采用高集成度的半桥驱动芯片FAN7387V和电子变压器漏感镇流技术,设计了一种可调压调光的紧凑型节能灯(CFL)电子镇流器。重点阐述了基于FAN7387V开关电路的设计,分析了变压器漏感镇流电路的等效模型,采用PSPICE软件进行了仿真。开发出结构紧凑、PCB布板直径小于Φ37mm的电子镇流器,并应用于7W可调光CFL,线性调光深度达到85%,节能效果明显,性价比高。     

手机充电器应用电源管理IC实现10mW低待机功耗

2008年11月世界主要手机供货商公布的新手机充电器的待机规范,明确定义出不同的待机功耗有不同的标识星级,其中最高五颗星的待机功耗必须降低至30mW以下,因此,要如何使电源转换器达到更低的待机功耗,将会是电源设计工程师未来所需要迎接的挑战。     

电压临界工作模式的有源功率因数校正器的设计应用

介绍了美国Fairchild公司生产的低成本电压型临界工作模式（CRM）PFC控制芯片FAN7530的性能及特点。着重研究了FAN75230在有源功率因数校正前置升压变换器中的应用,关键元器件的参数设计,同时分析了在实验中易出现故障的解决方案。