基于DSP的实时织物疵点检测系统

基于DSP技术开发一种实时织物疵点检测系统,用于解决传统人工检测织物疵点存在检测精度差、效率低、成本高等问题。在分析疵点纹理灰度特征的基础上,通过块操作提取织物图像背景,将疵点图像进行预处理、自适应阈值二值化(Ostu法)、形态学开运算处理完成疵点检测;描述了系统软件算法的设计,在TI的DSP TMS320DM6446、Linux和CCS开发环境下编程和调试,在显示器上实时显示检测结果。经实验验证,该系统具有检测精度高、实时性好、效率高等特点。     

基于DSP的棉花异性纤维检测系统总体方案研究

本文介绍棉花异性纤维检测系统的国内外现状，叙述了检测系统的总体设计方案，包括系统的总体结构、检测项目的器件等。同时结合当前电子技术和图像处理技术的最新发展，介绍了用于棉花检测系统的性能指标和设计准则，提出了采用FPGA＋DSP结构来实现图像检测的方法。 本文是作者《基于DSP的棉花异性纤维检测系统》一文的部分摘编，其另外两部分为图像处理算法与硬件设计和系统的软件设计与仿真测试。     

贝类毒素检测中两种筛选方法的比较研究

目的 采用传统小鼠生物法(MBA)和酶联免疫吸附法(ELISA)对贝类样品中四类毒素进行检测, 为不同要求下建立或选择准确的贝类毒素检测快速筛选方法提供参考。方法 分别采用MBA和ELISA检测腹泻性贝毒(DSP)和麻痹性贝毒 (PSP), 并采用ELISA检测记忆缺损性贝毒(ASP) 和神经性贝毒(NSP)。结果 对2009~2011年8种67份贝类样品进行检测, 结果表明: 两种测试方法在实际应用中对DSP、PSP检测结果不存在差异, 检测结果有很好的吻合性。使用ELISA法对自制ASP、NSP模拟阳性样品进行检测, 均测得ASP、NSP, 检测结果满意。结论 两种筛选方法在贝类毒素检测中均有其应用空间。实验室可根据不同情况选择合适的检测方法。     

基于固定化酶的蛋白质磷酸酶抑制率法测定腹泻性贝类毒素

目的 建立和优化用于检测腹泻性贝类毒素(DSP)的固定化蛋白质磷酸酶2A(PP2A)抑制率法。方法 以分离提取的PP2A为材料,根据DSP抑制PP2A酶活性的原理,建立用于检测DSP的固定化PP2A酶抑制率法,并对最佳酶用量和反应体系参数等进行了优化。结果 最佳的固定化PP2A酶蛋白量2μg、固定化配比为琼脂糖与PP2A酶蛋白量为1:1、pH值为8.4;采取4参数Logistic曲线法进行标准曲线拟合,曲线R2值达0.994,检测限为3.45μg/L,实际样品测定时具有良好的准确性和重复性。结论 建立的固定化PP2A酶抑制率法有望作为低成本、操作简单的DSP快速筛检方法推广应用。     

基于多DSP并行处理的管道检测机器人双目视觉系统设计

本文设计了一种管道检测机器人双目视觉系统。系统基于4片ADSP-TS201S的DSP并行处理结构,采用混合耦合链路口与共享总线的多DSP并行处理方案,以达到保障共享资源、数据速率、通信灵活的目的。进行了系统设计,对DSP间的数据交换进行了描述,保证了在实时环境下双目视觉系统处理海量运算的需求。     

DSP工业丝用聚酯切片的粘度检测

为配套开发DSP工业丝用聚酯切片的生产技术,制定了一套适用于检测DSP工业丝用聚酯切片粘度的方法。使用本方法检测DSP工业丝用聚酯切片的粘度,其标准偏差为0．003。本检测方法完全可作为DSP工业丝用聚酯切片生产的过程控制和产品检验的粘度评价方法。     

啤酒瓶空瓶检测系统的视频图像采集部分的实现

为了提高啤酒灌装线生产自动化的水平 ,开发设计了一套基于DSP与FPGA的啤酒瓶空瓶检测系统。在介绍了系统的组成原理的基础上 ,详细讨论了视频图像采集部分的硬件结构 ,FPGA与DSP的控制逻辑。这种设计具有功能集成 ,实现简单 ,修改方便等优点 ,能得到满意的图像结果     

不同分子量铁皮石斛多糖体外抗氧化活性研究

采用分步醇沉法对铁皮石斛总多糖(DSP)进行分离,得到乙醇终浓度为40%(DSP3)、70%(DSP2)和90%(DSP1)的多糖。进一步对4 种铁皮石斛多糖的抗氧化活性进行测定,结果显示：DSP1 对DPPH·的清除作用、总抗氧化能力、抑制H2O2 诱导红细胞氧化溶血和抑制Fe2+-VC 诱导的小鼠肝匀浆脂质过氧化作用效果最佳,DSP 和DSP3次之,DSP2 相对较弱;对·OH 的清除率大小依次为DSP ＞ DSP3 ＞ DSP1 ＞ DSP2;且不同相对分子质量的铁皮石斛多糖均可显著抑制羟基自由基介导的DNA 氧化断裂。结果提示：不同相对分子质量铁皮石斛多糖均有抗氧化作用,且抗氧化能力与其相对分子质量大小有关。     

基于近红外光谱和多层感知机的贻贝中腹泻性贝毒快速无损检测

以腹泻性贝毒(diarrheal shellfish poison, DSP)污染和未污染良好贻贝为研究对象，利用近红外光谱仪采集950～1 700 nm波长内各120个样本的光谱数据；分析确定适合贻贝近红外光谱(near-infrared spectroscopy, NIS)的最佳预处理方法来消除环境光的影响；构建多层感知机(multi-layer perceptron, MLP)模型作为检测DSP污染贻贝的分类器。将240个样本构成的数据集按照7∶3随机划分为训练集和测试集，将运行50次模型得到的准确率的平均值作为最终评价指标，检测DSP污染贻贝的准确率达到99.94%。该研究所构建的基于NIS的MLP模型对DSP的检出限为35μg/kg。对于实际应用中存在的数据集中训练集所占比重不同、小样本和类别不均衡等问题，分析了MLP模型的检测性能。实验结果表明，基于一阶导数光谱预处理的MLP模型对以上3种问题不敏感，说明该分类器泛化能力及鲁棒性较强。因此，将NIS与MLP分类器结合是一种可行的贝毒无损鉴别的新方法。     

基于DSP的无菌检测控制系统设计

随着医药科技的发展,需要进行无菌检查的药品和医疗器械越来越多;为了适应药品和医疗器械生产企业的发展,提供性能稳定、操作方便,检测效率高的无菌检测系统极为重要。本系统以TI公司的数字信号处理器(Digital Signal Processor DSP)TMS320F2808为核心单元,设计了一种无菌检测控制系统,主要包括电源电路,无刷直流电机运行驱动控制的硬件电路、电机的控制软件。应用结果表明,该系统结构紧凑,控制精度高,运行平稳,噪音低,温升小,可靠性高,有良好的应用价值。     

一种新型并条机在线检测系统

分析了并条机在线检测系统,提出把DSP应用到质量检测装置中。简要介绍了TMS320C5402McBSP特点,给出通过McBSP扩展成SPI串口和工控机通信的设计方案,充分利用DSP和MCBSP接口功能实现工控机和DSP实时通信。利用TI公司提供的DSPLIB库函数,包含FFT运算,使在DSP上进行FFT运算变得容易。     

Monitoring phytoplankton and marine biotoxins in production waters of the Netherlands: results after one decade

Shellfish products may be contaminated with marine biotoxins which, after consumption, may lead to human illness. The Netherlands has a regular monitoring programme for marine biotoxins and the possible toxic phytoplankton in shellfish production waters. The aim of the current study was to evaluate the presence of potential toxic phytoplankton species and marine biotoxins in Dutch production waters over the last decade, and to analyse the relationship between toxin levels and abundance of possible causative phytoplankton species. The results of the monitoring programme of the period 1999-2009 were used. The presence of Alexandrium spp. were negligible, but Pseudo-nitzschia spp. and phytoplankton causing diarrhetic shellfish poisoning (DSP toxin-producing phytoplankton) were present in nearly all three main production areas and years. The main DSP toxin-producing species was Dinophysis acuminata followed by D. rotundata and Prorocentrum lima. Toxins causing paralytic shellfish poisoning (PSP) and amnesic shellfish poisoning (ASP) were present in only a few individual shellfish samples, all at low levels. At the end of 2002, an episode of DSP toxicity was recorded, based on the rat bioassay results. Of the samples that were chemically analysed for DSP toxins in 2007 and 2008, about half of the samples in 2007 contained these toxins, although levels were low and no positive results were obtained using the rat bioassay. There was a slight positive correlation between concentrations of DSP toxin-producing phytoplankton and levels of DSP toxins in 2007. Increased DSP toxin levels were found up to 5 weeks after the peak in DSP toxin-producing phytoplankton. This positive, but weak, relationship needs to be confirmed in future research using more samples and chemical methods to quantify the presence of DSP toxins. If this relationship is further substantiated and quantified, it could be used within the current monitoring programme in the Netherlands to predict the risk areas regarding DSP toxicity in shellfish.     

基于DSP的电织针控制器设计

电织针控制器设计采用DSPTMS320F2812来控制电织针运动,并用IR2110作为功率放大电路的驱动模块,构成的整个驱动电路具有结构简单、驱动能力强、功耗低的特点。通过DSP芯片产生驱动电路所需要的PWM信号,同时由DSP芯片采集和处理位置传感器信号,实现织针的反馈控制。DSP通过串口和PC机建立通信,实现PC机发布指令控制织针运动。     

大豆素丸和三种肉丸的营养成分与质构特性比较

比较以大豆拉丝蛋白为主要原料、经棕榈油炸制的大豆拉丝蛋白素丸子,与自制猪肉丸子、市售鱼肉和牛肉丸子的营养成分与质构特性,探讨其应用价值。采用国标法检测丸子的营养成分,质构仪检测四种丸子的质地。蛋白质含量从高到低依次为拉丝蛋白丸子39.06 mg N/g、猪肉丸子30.11 mg N/g、牛肉丸子19.91 mg N/g、鱼肉丸子12.79 mg N/g。胆固醇含量从高到低依次为牛肉丸子28.71 mg/100 g、猪肉丸子25.27 mg/100 g、鱼肉丸子14.83 mg/100 g、拉丝蛋白素丸子1.21 mg/100 g。猪肉丸子的脂肪含量显著高于其他三种丸子(p0.05)。大豆拉丝蛋白素丸子的总氨基酸、必需氨基酸、鲜味氨基酸含量最高,分别为15.44±0.59、5.33±0.20、8.89±0.34(g/100g)。四种丸子的不饱和脂肪酸比例很高,占各自总脂肪含量的59%到73%。大豆拉丝蛋白素丸子的弹性、回复性最好,分别为96.84%±1.43%、52.77%±0.56%。研究表明大豆拉丝蛋白素丸子的蛋白质含量高、胆固醇低、氨基酸含量高、有丰富的不饱和脂肪酸、营养价值高、口感佳,可以作为传统肉丸的替代品。     

Extraction recoveries and stability of diarrhetic shellfish poisoning (DSP) toxins in naturally contaminated samples

During the last few years the occurrence of a high percentage of esters of diarrhetic shellfish poisoning (DSP) toxins has been observed in shellfish from the Portuguese coast. Most of the commercial bivalves contain DSP toxins in ester forms, either acyl derivatives of okadaic acid (OA) or of dinophysistoxin-2 (DTX-2). The stability of these toxins in shellfish tissues and in raw methanol extracts was investigated in two different naturally contaminated species, mussel and carpet shell, over a 4-week period. The results for both species revealed that DSP toxins were more stable in tissue than in raw methanol extracts. Losses of DSP toxins were seen in the first 2 weeks and were more than 30%, but after that a period of stabilization was observed. The decrease was due probably from losses of esters of OA and DTX-2, the free toxins were stable over the period studied. The extraction most commonly used for chemical and biochemical assays relied on methanolic extraction with aqueous 80% methanol. In this work we have tested the extraction solvent on the extractability of DSP toxins from several naturally contaminated species. A single dispersive extraction with methanol, with solvent ratios of 70%, 80%, 90% and 100%, were tested. After alkaline hydrolysis of esterified toxins and clean-up with hexane and dichloromethane, the samples were analysed by liquid chromatography-mass spectrometry (LC-MS). The recovery of DSP toxins increased with increasing percentages of methanol up to 90%. A decrease in recovery with 100% methanol was observed probably due to problems during the liquid–liquid partitioning.     

天津市市售贝类腹泻性贝类毒素的调查研究

目的 对2011年2月-2012年1月天津市售双壳经济贝类腹泻性贝毒(DSP)污染状况进行为期一年的抽样,调查其食用安全性.方法 分别采用小鼠生物法和液相色谱-串联质谱法(LC/MS-MS)对可食部分进行检测,测定毒素含量及分析毒素组成.结果 在所抽查的10种103个贝类样品中,只有产自河北唐山的毛蚶中5月和8月采集的样品中有2个呈阳性且均超标.对阳性样品进行LC/MS-MS检测,检出DTX-1和YTX毒素.结论 腹泻性贝毒在天津市场范围内检出率及含量整体水平不高,但应提示有关部门应在春季预防,在夏季加强对食用贝类的监测和宣传,以保证市民健康安全.     

Simulated gastrointestinal digestion and in vitro colonic fermentation of date (Phoenix dactylifera L.) seed polyphenols

Date seeds are a by‐product of date fruit industry and a rich source of polyphenols. In this study, in vitro bioaccessibility and colonic fermentation of major polyphenols from date seed powder (DSP) and DSP‐fortified yoghurt (DSPY) were investigated using HPLC. Catechin, epicatechin and procyanidin A2, B1 and B2 were stable during simulated gastric and sequential intestinal digestion. Bioaccessibility was significantly (P < 0.05) higher for all compounds from DSPY compared with DSP. After in vitro colonic fermentation of insoluble digestion materials, most of the target compounds were metabolised by faecal bacteria to ferulic acid, 3‐hydroxyphenylacetic acid, 3‐phenylpropionic acid and 3‐(4‐hydroxyphenyl) propionic acid. DSPY contained significantly (P < 0.05) higher level of free polyphenols as indicated by higher bioaccessibility; however, the stability of the polyphenols and their fermentation products from DSPY were similar to that of DSP alone. These data would be useful in product developments incorporating DSP as a source of polyphenols in food products.     

Geographical and annual variation in lipophilic shellfish toxins from oysters and mussels along the south coast of Korea

To better understand critical aspects of diarrhetic shellfish poisoning (DSP) occurrence in a chief producing region of bivalves in Korea, the geographical and annual variation of DSP toxins and other lipophilic toxins in mussels (Mytilus galloprovincialis) and oysters (Crassostrea gigas) were investigated by liquid chromatography-tandem mass spectrometry in an area on the south coast of Korea from 2007 to 2009. The total lipophilic shellfish toxin (LST) levels in bivalves showed geographical and annual variations. LSTs were detected mostly in the hepatopancreas of mussels from Jinhae Bay throughout the entire year, except in November and December of 2007, but were almost undetectable in all samples during the entire year in 2009. The peak DSP toxin (okadaic acid plus dinophysistoxin 1) levels in the hepatopancreas of mussels from Jinhae Bay and the Tongyeong region were 945.3 and 37.6 ng/g, respectively. The DSP toxin content was about 10 times higher in mussels than in oysters collected from the same region. The major toxins in bivalves were okadaic acid and dinophysistoxin 1; however, pectenotoxin 2 or yessotoxin was occasionally detected as a major component. The results of a quantitative analysis of phytoplankton showed that Dinophysis acuminata was the most probable source of the LSTs, with the exception of yessotoxin. When the highest DSP toxin level was measured (945.3 ng/g in the hepatopancreas of mussels from Jinhae Bay), the toxin concentration in whole mussel tissue was calculated to be 114.0 ng/g. The calculated highest DSP toxin level in whole oyster tissue from both regions was 15.0 ng/g. The calculated maximum toxicities in whole mussel and oyster tissues were lower than the regulatory limit (160 to 200 ng/g) in Korea, the European Union, and the United States. Korean oysters (242 samples) and mussels (214 samples) were thus deemed safe for consumption. But because such variation was detected in a relatively small area of the coast, it is possible that at some locations or during a specific period LST levels could exceed the standard and a few consumers could be at risk of experiencing DSP.