基于标记的极半径极值红枣形状识别方法   总被引：2，自引：0，他引：2  

肖爱玲  潘斌 《农机化研究》2015,(7):61-65

形状是分级的最重要参数之一,本文采用标记法对红枣形状进行了识别。通过图像预处理获取红枣二值图像,通过边界追踪获取目标边界笛卡尔坐标,并将其转化为极坐标,对目标图像进行缩放旋转使均值圆成为基线,切割的4部分边界曲线能完整表达。对边界曲线进行多项式拟合,获取极值点坐标,将其映射回被拟合曲线上,获取对应极值点坐标。若两极小极半径差值大于阈值,则红枣畸形;若两极大极半径附近区域极半径过渡平缓,判红枣为规整,否则为较规整。取53粒红枣进行检测,其中16粒畸形,17粒较规整,20粒规整。检测结果表明:畸形枣识别准确率达100%,较规整枣的识别准确率94%,规整枣识别准确率95%,可基本满足红枣分级系统精度的要求。  相似文献   

Effect of diet with thiram on liver antioxidant capacity and tibial dyschondroplasia in broilers     

Li J  Bi D  Pan S  Zhang Y 《British poultry science》2007,48(6):724-728

1. An experiment was conducted to study the effect of thiram on liver antioxidant capacity and incidence of tibial dyschondroplasia in broilers. 2. One hundred and twenty Avian commercial broilers were allotted at random to three treatments: control group, low thiram group (50 mg/kg) and high thiram group (100 mg/kg). 3. Blood samples were collected to determine the activity of AST (aspartate aminotransferase). At the end of the trial, broilers were killed and liver samples were collected to determine the activity of SOD (superoxide dismutase), GSH-Px (glutathione peroxidase) and MDA (malondialdehyde) content, while the right proximal tibiotarsi were dissected in longitudinal section for assessment of tibial dyschondroplasia (TD) incidence and TD score. 4. The results showed that thiram increased the incidence of TD and TD scores, increased serum AST activity and MDA content of liver, and decreased the activity of SOD and GSH-Px in the liver. 5. They suggest that thiram causes TD in broilers by reducing liver antioxidation capability and damaging liver function; this may be one of the mechanisms by which thiram causes TD in broilers.  相似文献   

微热光电系统燃烧室内截面突变对燃烧的影响   总被引：1，自引：0，他引：1  

潘剑锋  唐维新  黄俊  李德桃  杨文明 《农业机械学报》2007,38(3):44-46

微燃烧室是微热光电（MTPV）系统的重要组成部分。微燃烧室的外表面必须产生一个高而均匀的温度分布，以尽可能高地输出辐射能。通过对截面突变的微燃烧室的试验研究，得到了不同氢氧混合气流量、氢氧体积混合比下燃烧室内的燃烧状况，壁面和出口端面的温度分布。试验结果表明：采用截面突变的燃烧室能很好地控制火焰中心位置，获得稳定的外壁面温度分布规律，可以在截面突变处产生涡流，增强氢气和氧气的混合。  相似文献   

活性炭吸附汽油机冷起动HC排放的实验     

纪常伟  潘耀江 《农业机械学报》2007,38(3):61-64

为控制汽油机的冷起动HC排放，开发了一个活性炭吸附器，用于吸附车用汽油机冷起动阶段排放的HC。吸附材料采用煤质蜂窝状定型活性炭块，吸附器外表面用薄钢板焊接封装，整个吸附器串接在排气管上。进行汽油机冷起动排放实验，测量起动后200s内的HC排放量，实验结果表明，在冷却水温度为20U、40℃、60℃和85℃时，活性炭吸附器对HC的吸附率分别达到86．64％、70．34％、79．69％、77．45％。  相似文献   

明甪直天王殿松木斗拱振动台试验研究   总被引：2，自引：0，他引：2  

阙泽利  李哲瑞  张贝贝  侯同宇  潘彪 《保鲜与加工》2015,(3):26-34

以甪直保圣寺天王殿斗拱为参考对象,进行无缩尺松木斗拱模型的地震台试验研究。通过对斗拱的加速度与动力放大系数变化趋势、斗拱在振动过程中位移响应变化特征、斗拱变形最大时刻和各构件变形最大时刻的滑移位移和回转位移数值对比分析,得出以下结论：地震加速度用于衡量地震烈度,并不能直接反映斗拱试件的最大变形;振动频率的变化对斗拱回转变形的变化起重要作用,振幅是决定各构件水平滑移的主要因素;各构件变形最大值与斗拱整体变形最大值具有很强相关性,其中栌斗和华拱的回转变形对斗拱的整体变形而言,处于支配地位;斗拱的华拱连下昂部分主要起装饰作用,其榫卯连接节点位置在振动过程中较为薄弱,在对实际文物维护修缮过程中应引起重视并采取相关加固措施。  相似文献   

Micromodel of Computer Emulational Simulation on Twin-roll Casting Strip Solidification Structure     

HOU Shi-dong  PENG Xiao-dong  YANG Ming-bo  Pan Fu-sheng 《保鲜与加工》2001,(2):24-27

Based on the research on the solidifiation of twin-roll casting strip,the analytical model and emulational model of nucleation,the growth of dendrity tip and colunar dendrity transformation to equiaxis dendrity (CET)of twin-roll casting strip solidification are established by means of the principle of metal solidification and modern computer emulational technology.The foundation for the emulational simulation of twin-roll casting strip solidification structure is laid.  相似文献   

Numerical Analysis and Optimization of a Small Vehicle Heat Exchanger     

SUN Deng-xing  DENG Zhao-xiang  WANG Pan  LUO Hong 《保鲜与加工》2006,(4):50-53

This paper analyzes the fluid flow and heat transfer of the heat exchanger, and obtainsd the distribution of fluid field, heat field and pressure field in heat exchanger. According the analysis result, some modify measure is adopted, such as decreasing the number of tube bundle, the size of baffle plate and increasing the diameter of exchange heat tube. In the new heat exchanger, the resistance decreased 32.3%, is 103.2 Pa and the temperature of the exit is 130 K. The new heat exchanger satisfies the requirement of exchanging heat. The study indicates that adopting the numerical simulation method could get temperature, pressure and fluid - velocity of anywhere of the heat exchanger, and understand effecfing of structure parameter on fluid flied and heat flied of the heat exchanger. Therefore, it provides a new method for optimization design of heat exchanger.  相似文献   

CALCULATION OF ULTIMATE STRESS OF UNBONDED PRESTRESSED TENDONS IN UNSYMMETRICAL DEFLECTED BEAMS     

Pan Li Institute of Building Structures  China Academy of Building Research 《保鲜与加工》1989,(3)

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Requirement Model Based on UML 2.0 for Equipment MIS     

LI Pan  YU Ji-hui  FU Zhi-hong 《保鲜与加工》2005,(7):47-50

This paper introduces the modeling of Unified Modeling Language with use case diagram and active diagram based on Rational Unified Process for Equipment Managemet Information System. It discusses the modeling mechanism and character of UML and develops the Computer Equipment management Information System Based Web using Rational Rose of UML CASE Tool. First, it is describe the authors how to analyze the structure of organize and build the model of structure organize. Second, they abstract the workflow of main operation in organize and build workflow model by active diagram. Finally, they abstract actor, use case with case diagram and finish the requirement model.  相似文献   

直墙拱形巷道围岩应力场分析     

唐治  潘一山  朱小景  崔乃鑫 《保鲜与加工》2015,(3):79-85

为得出直墙拱形巷道围岩应力分布规律,应用复变函数弹性理论推导了直墙拱形巷道围岩应力分布的解析表达式。对直墙拱形巷道边界的围岩应力和巷道水平线方向的围岩应力分布规律进行分析,并考虑直墙拱形巷道断面高宽比和侧压系数对其影响规律。研究表明：在不同巷道断面高宽比、侧压系数下,直墙拱形巷道围岩应力集中区域主要集中在直墙底部底角处、拱形顶板中点附近和底板中部3个位置。不同巷道断面高宽比下,直墙拱形巷道沿水平线的应力分布规律基本相同。侧压系数大于1时,采用巷道断面高宽比小于1较有利于巷道稳定;侧压系数小于等于1时,采用巷道断面高宽比大于1较有利于巷道稳定。  相似文献