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21.
廷璋 《高科技纤维与应用》2011,36(1):32-35,43
综述了日本和欧美静电纺丝纳米纤维技术和制品的新进展、已产业化的品种和正在研发的多样新品种和新用途,指出未来的研发方向和动向. 相似文献
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THE DEVELOPMENT OF A MACHINE VISION SYSTEM FOR SHIITAKE GRADING 总被引:1,自引:0,他引:1
A grading system was developed to classify shiitake automatically into various grades of quality in terms of size, shape and color. A shiitake is scanned with a color charge‐coupled‐device camera and then various geometrical and color characteristics are determined by image processing. The online grading procedure includes the following sequences in processing dried shiitake: (a) color abnormality is eliminated by image analysis; (b) broken caps are detected by calculation of the area‐to‐perimeter ratio; and (c) size is determined by pixel counting from the bottom view. Image processing and algorithmic manipulations are done on a personal computer (PC) while grading is carried out by a programmable logic controller (PLC). The PLC accepts grading instructions from the PC, hence controls the grading mechanisms. Pilot system validation was done on 250 dried shiitake samples and resulted in a 97.6% accuracy rate. This result is better than that by visual inspection. A complete grading cycle takes 4.8 s, of which the PC unit participates 0.3–0.7 s depending on the physical complexity of the shiitake being processed. 相似文献
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GIOVANNA D. ALEMÁN MARCIA WALKER DANIEL F. FARKAS J. ANTONIO TORRES EDMUND Y. TING SIGURD C. MORDRE ADRIAN C.O. HAWES 《Journal of food science》1996,61(2):388-390
Sinusoidal and step-pressure pulses were compared with static pressure treatments for the inactivation of Saccharomyces cerevisiae 2407-1a in pineapple juice. No inactivation was observed after 40–4,000 fast sinusoidal pulses (10 cycles/s) at 4–400 sec in the 235–270 MPa range. Static 270 MPa treatments at 40 and 400 sec resulted in 0.7 and 5.1 decimal reductions, respectively. Slower 0–270 MPa step pulses at 0.1 (10 pulses), 1 (100 pulses), and 2 (200 pulses) cycles/s with 100 sec total on-pressure time resulted in 3.3, 3.5, and 3.3 decimal reductions, respectively. A comparable static pressure treatment resulted in 2.5 decimal reductions. Changing the on-pressure/off-pressure time ratio (3:1, 3:3 and 1:3) showed that treatments with longer on-pressure time, e.g., 0.6 sec on-pressure and 0.2 sec off-pressure were significantly more effective showing nearly a 4 decimal reduction in 100 sec. 相似文献
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轨迹发生器设计与仿真 总被引:1,自引:0,他引:1
轨迹发生器在惯性导航技术研究过程中是非常重要的,本文介绍了轨迹发生器软件包设计的整体思路,详细推导了轨迹方程,描述了外部信息控制下的位置、速度、姿态、比力以及载体绝对角速度的变化规律,分析了载机在直线飞行、滚转摇摆、转弯机动、正弦机动四种飞行轨迹的控制规律,完成了相应的控制方程的设计,最后对载机在对称轴滚转摇摆飞行状态时轨迹发生器进行了仿真.仿真结果表明该轨迹发生器的设计是正确的,符合载机飞行的各种实际状态. 相似文献
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在地质普查、安全监控等众多任务中,合成孔径雷达成像系统产生着海量的图象数据.必须通过有限的通道传回地面,迫切需要一个能从图象的信息中自动检测目标或兴趣区域的智能压缩技术。为此,本文提出了一种基于标准特征检测方法的Bayes网络融合检测方法检测兴趣区域,并据此对图象的小波分解系数进行变化和编码,从而既实现高压缩,又保持了关键区域图象的质量。 相似文献
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The objective of this study was to investigate the accuracy of using the total double-bond value (TDV) of edible oil to predict its effect on the plasma lipid level of rats. The test oils used included fish oil, squid visceral oil (high long chain n-3 PUFA, corn oil, soybean oil (high n-6 PUFA), olive oil, lard (high MUFA) and hydrogenated beef tallow (high SFA, S). Test diets contained 15% of each test oil with the cholesterol level made up to 1%. The results demonstrated that the sum of the percents of each MUFA and PUFA in an oil, multiplied by the number of double bonds in each compound (TDV), may be a better indicator to predict the effects of the oils on plasma lipid metabolism. There was a negative correlation between TDV and plasma total lipids and cholesterol levels, but the lard group was slightly lower than expected. Using TDV as an indicator for plasma lipid metabolism may not be perfect, but is much better than the P/S or P+M/S ratio. 相似文献
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