基于DVI接口的图像总线控制系统

设计了一种基于DVI接口的高速图像采集控制系统。该系统能够稳定采集Camlink接口的高速CCD传输的数字信号,并能提供一路DVI接口高清显示和一路PAL制式复合视频。系统可与上位机通过CAN总线实现数据交互,并提供数字视频信号给压缩存储单元和图像处理单元。系统硬件结构简单,工作稳定可靠,能够广泛应用于图像处理领域。     

Secondary Metabolic Profile as a Tool for Distinction and Characterization of Cultivars of Black Pepper (Piper nigrum L.) Cultivated in Pará State,Brazil

This study evaluated the chemical compositions of the leaves and fruits of eight black pepper cultivars cultivated in Pará State (Amazon, Brazil). Hydrodistillation and gas chromatography–mass spectrometry were employed to extract and analyze the volatile compounds, respectively. Sesquiterpene hydrocarbons were predominant (58.5–90.9%) in the cultivars “Cingapura”, “Equador”, “Guajarina”, “Iaçará”, and “Kottanadan”, and “Bragantina”, “Clonada”, and “Uthirankota” displayed oxygenated sesquiterpenoids (50.6–75.0%). The multivariate statistical analysis applied using volatile composition grouped the samples into four groups: γ-Elemene, curzerene, and δ-elemene (“Equador”/“Guajarina”, I); δ-elemene (“Iaçará”/“Kottanadan”/“Cingapura”, II); elemol (“Clonada”/“Uthirankota”, III) and α-muurolol, bicyclogermacrene, and cubebol (“Bragantina”, IV). The major compounds in all fruit samples were monoterpene hydrocarbons such as α-pinene, β-pinene, and limonene. Among the cultivar leaves, phenolics content (44.75–140.53 mg GAE·g⁻¹ FW), the enzymatic activity of phenylalanine-ammonia lyase (20.19–57.22 µU·mL⁻¹), and carotenoids (0.21–2.31 µg·mL⁻¹) displayed significant variations. Due to black pepper’s susceptibility to Fusarium infection, a molecular docking analysis was carried out on Fusarium protein targets using each cultivar’s volatile components. F. oxysporum endoglucanase was identified as the preferential protein target of the compounds. These results can be used to identify chemical markers related to the susceptibility degree of black pepper cultivars to plant diseases prevalent in Pará State.     

用富集培养技术分离具有PAL活性的酵母菌

为获取具有ＰＡＬ活性的菌株，设计了从天然源分离酵母菌的定集培养技术，并从中国西南地区采集２０个样品中得到菌株１４０余株，结果表明本富集培养技术用于从天然源分离具有苯丙氨酸解氨酶活性的菌株是有效、可行的。     

内渐进镜片加工中的过切判据的研究

针对内渐进镜片在加工过程中出现过切的情况,提出一种判断方法。该方法使用双三次样条曲面参数方程计算自由曲面各点曲率半径最小值,通过三维软件对曲面曲率半径进行计算,研究镜片在机床上实现加工的判据。由分析和计算表明,若曲面加工范围内存在某些点的曲率半径小于给定的机床刀具半径,则机床无法加工内渐进镜片的曲面。     

定向刨花板革命性技术和创新装备之大成

介绍了意大利意玛帕尔集团提供的特种定向刨花板生产线生产工艺及其设备创新。     

PAL法生产苯丙氨酸的中试研究

报道了苯丙氨酸的扩大试验，在200L种子罐／2500L发醇罐规模上，寻找最佳发醇条件，通过六批培养，转化试验，L－苯丙氨酸平均累积量为30.7g/L.     

基于USB接口的同步视频输出系统设计

介绍了一种实用的基于USB2.0协议的同步视频输出系统的设计。系统采用CYPRESS公司的FX2USB控制器,采用GPIF模式,硬件设计简化,能依据PAL制电视标准与主机同步输出视频图像。     

Effects of Pre- and Postharvest Chitosan Treatments to Control Storage Grey Mold of Table Grapes

ABSTRACT: The effectiveness of pre- and postharvest treatments with chitosan (0.1, 0.5, and 1.0%) to control Botrytis cinerea on table grapes was investigated. In postharvest treatments, small bunches dipped in chitosan solutions and inoculated with the pathogen showed a reduction of incidence, severity, and nesting of grey mold, in comparison with the control. Single berries artificially wounded, treated with the polymer, and inoculated with B. cinerea showed a reduced percentage of infected berries and lesion dia. Higher chitosan concentrations demonstrated greater decay reduction. All preharvest treatments significantly reduced the incidence of grey mold, as compared to the control. Table grapes treated with 1.0% chitosan showed a significant increase of phenylalanine ammonia-lyase (PAL) activity. Consequently, besides a direct activity against B. cinerea , chitosan produces other effects contributing to reduce decay.     

数字视频采集回放系统的SoPC设计

介绍了一种基于SoPC技术的嵌入式数字视频图像采集控制模块的设计方案,通过在CycloneⅡFPGA上配置NiosⅡ软核处理器、ADV7181的I2C配置模块、视频图像采集模块、视频图像解码及颜色转换等相关接口模块来实现硬件平台,并利用Altera公司的软件集成开发环境NiosⅡIDE进行软件设计来控制整个采集流程.对...