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排序方式: 共有62条查询结果,搜索用时 218 毫秒
1.
随着深亚微米技术,串扰噪声问题越来越严重。利用MAF模型的基本思想,探讨了一种串扰时延最大化算法,并且利用被修改的FAN算法,生成测试矢量。对于一条敏化通路,利用被修改的FAN算法适当地激活相应的攻击线和受害线,使电路在最恶劣情况下引起最大通路时延,从而实现更有效的时延测试。在标准电路ISCAS’85上进行实验验证,结果表明:该算法对于多攻击线的串扰时延故障的测试矢量产生是有效的。 相似文献
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美国飞兆半导体公司最近推出两款新型紧凑型荧光灯(CFL)和直管型荧光灯(TL)电子镇流器控制器FAN7710与FAN7711。文中介绍了两种控制器的主要特点,给出了由其组成的实际电子镇流器电路。 相似文献
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FAN7710V是利用飞兆的独特高压工艺和系统在封装中的概念研制的紧凑型荧光灯镇流器控制IC。FAN7710V控制内部高压应力并在310V的DC电压上为灯交付20W功率。本文介绍了基于TFAN7710V的CVL镇流器工作原理与设计。 相似文献
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F. Kühbeck T. Dickel M. Krottenthaler W. Back M. Mitzscherling A. Delgado T. Becker 《Journal of the Institute of Brewing》2005,111(3):316-327
To gain further technological knowledge of mashing, pilot scale mashing trials were carried out varying mashing programme (upward/isothermal mashing), milling procedure, grist:liquor ratio, time of mash stands, and grist modification level (well and poorly modified malt). During mashing β‐glucan, free amino nitrogen (FAN) and extract contents were analysed as key indicators for cytolysis, proteolysis, and amylolysis, respectively. The malt modification was of major impact for the β‐glucan release in contrast to a variation of milling procedure and of grist:liquor ratio. Extended stands lead to increased final values only for poorly modified malt. Similarly, FAN release was predetermined by malt modification while variation of milling and of grist:liquor ratio was not relevant in contrast to stand extension. None of the variations applied influenced extract yield as long as gelatinization temperature was reached. Greatest gains occurred around 57°C. In conclusion, wort quality is critically determined by malt modification. Mashing with well modified malt in combination with short stands should result in a mash of low β‐glucan and sufficient FAN level without losing extract yield. However, for poorly modified malt the variation of mashing parameters has an impact on the key indicators in which cytolysis plays the dominating role. 相似文献
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Blaise Patricia Nic Phiarais Hilde Henny Wijngaard Elke Karin Arendt 《Journal of the Institute of Brewing》2005,111(3):290-298
This study investigated the impact of kilning on α‐amylase, β‐amylase (total and soluble), β‐glucanase and protease activities in buckwheat malt. Common buckwheat (Fagopyrum esculentum) was steeped at 10°C for 12 h, germinated at 15°C for 4 days and kilned at 40°C for 48 h. Moisture content and enzymatic activities were determined throughout the kilning period. Results showed moisture content was reduced from 44% to 5% after 48 h of kilning at 40°C. β‐Amylase was found to exist in a soluble and latent form in buckwheat. Maximum activity of (a) α‐amylase, (b) total β‐amylase, (c) soluble β‐amylase, (d) β‐glucanase and (e) protease activity occurred after (a) 8, (b) 7, (c) 30, (d) 0, and (e) 8 h of kilning, respectively. The final malt exhibited very little β‐glucanase and cellulase activity. Proteolytic activity was low in buckwheat malt when compared to the barley malt control. All enzymatic activities were found to decrease during the kilning stage. Results indicated that after prolonged kilning at 40°C, inactivation of hydrolytic enzymes occurred; two‐stage kilning for shorter periods is recommended. Although, amylolytic activity was low in malted buckwheat, buckwheat malt shows potential as an ingredient for the brewing and cereal industry. 相似文献
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该文介绍了一种200WLED路灯电源推荐解决方案。这种电源由基于FAN6961的PFC预调节器和基于FSFff2100的谐振LLC变换器组成,并且有6路输出,每路最大输出为0.7A/48V。 相似文献
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功率因数校正控制器FAN7527及应用电路 总被引:1,自引:0,他引:1
FAN7527提供简易和高性能有源功率因数校正(PFC),对需要最小PCB面积,减少元件数量和低功率消耗的电子镇流器及高密度电源应用是最适宜的。本文介绍了FAN7527的功能、特点及应用电路。 相似文献
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