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《Food Control》2016
High speed data processing for online food quality inspection using hyperspectral imaging (HSI) is challenging as over hundred spectral images have to be analyzed simultaneously. In this study, a real-time pixel based early apple bruise detection system based on HSI in the shortwave infrared (SWIR) range has been developed. This systems consists of a novel, homogeneous SWIR illumination unit and a line scan camera. The system performance was tested on Jonagold apples bruised less than two hours before scanning. Partial least squares-discriminant analysis was used to discriminate bruised pixel spectra from sound pixel spectra. As the glossiness of many fruit and vegetables limits the accuracy in the detection of defects, several reflectance calibrations and pre-processing techniques were compared for glare correction and maximizing the signal to noise ratio. With the best combination of first derivative and mean centering, followed by image post-processing, this system was able to detect fresh bruises in thirty apples with 98% accuracy at the pixel level with a processing time per apple below 200 ms. 相似文献
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选取TI公司开发的MSP430F149单片机为控制核心的MIG焊过程控制系统,研究焊接电流、焊接速度、焊接方向&焊枪角度和钢侧坡口角度等对Q890D钢/6061铝合金焊缝成形的影响,并在优化焊接工艺下分析焊接电流和焊接速度对Q890D钢/6061铝合金MIG焊接头界面区组织和接头力学性能的影响。结果表明:Q890D钢/6061铝合金适宜焊接方向为右焊法,适宜的焊枪角度为10°,适宜的钢侧坡口角度为45°,焊丝位置宜处于钢侧坡口中部,适宜的焊接电流和焊接速度分别为105 A和50 cm/min;不同焊接电流和焊接速度的Q890D钢/6061铝合金MIG焊接头的断裂位置都处于界面区,而MIG焊过程中界面区形成的靠近钢侧的(Fe,Cu)2Al5和靠近铝侧的(Fe,Cu)4Al13相的双层金属间化合物层结构有助于改善焊接质量。 相似文献
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一类(QL)型随机微分方程极值解的存在性 总被引:2,自引:0,他引:2
本文在非Lipschitz条件下,利用单调迭代法讨论了一类(QL)型随机微分方程极值解的存在性。 相似文献
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Optimal closed loop control of blood glucose (BG) level has been a major focus for the past so many years to realize an artificial pancreas for type-I diabetes mellitus (TIDM) patients. There is an urgency for controlled drug delivery system to design with appropriate controller not only to regulate the BG level, but also for other chronic clinical disorders requiring continuous long term medication. As a solution to the above problem, a novel sliding mode Gaussian controller with state estimation (SMGC/SE) is proposed, whose gains dynamically vary with respect to the error signal. For the designing of the SMGC/SE, a nonlinear TIDM patient model is linearized as a 9th order state-space model with a micro-insulin dispenser. This controller is evaluated and compared with other recently published control techniques. Obtained results clearly reveal the better performance of the proposed method to regulate the BG level within the normoglycaemic range in terms of accuracy and robustness. 相似文献
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Bitter gourd (BG fruit) is usually heated in hot water to reduce bitterness and improve flavour before being served. Protein extract from BG was analyzed for protease activity by gelatin-gel electrophoresis. The study showed that the proteolytic activity in BG flesh was enhanced by heat-treatment at temperatures ranging from 50 °C to 75 °C. An aspartic protease (AP) was characterized by gel electrophoresis. The optimal AP activity was at pH 7; the pI of the AP was demonstrated to be 4.8; the protein molecular weight of the BG–AP was estimated to be 60 KD by SDS–PAGE. The AP was implicated in the proteolysis of the photosynthetic enzyme ribulose-1,5-bisphosphate carboxylase/oxygenase. 相似文献
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采用溶胶-凝胶(Sol-Gel)法在已经预涂了一层过渡层的纯钛基体上制备生物玻璃(BG)涂层。试验以正硅酸乙酯(TEOS)、硝酸钙(Ca(NO3)2.4H2O)、氯化镁(MgCl2.6H2O)等为原料,并采用正交试验设计,所得涂层均通过SEM和EDS进行分析,并利用空间几何模型折算绝对偏差,从而确定出最优的试验参数为:[Si]=1 M,水酯比(Rw)=4,pH=4.5,浸涂粘度(η)为3.55 mPa.s。 相似文献