基于Agent的同类机智能调度算法     

李凯  左春荣  任明仑 《农业机械学报》2009,40(2):184-189

研究了目标函数是最小化最大完成时间的同类机调度问题,且作业到达时间可能不同.此问题被证明是NP-hard问题.为此问题构建了一个基于Agent的智能调度算法ABH,使得机器具有一定的智能性,从而实现工厂调度的自动化.给出了用于调度的两类Agent的语义描述,进而给出ABH算法描述.大量随机数据实验结果表明,ABH算法性能明显优越于现有算法,其相对于最优解的平均误差收敛达0.084%.  相似文献   

温室环境下黄瓜采摘机器人信息获取   总被引：9，自引：3，他引：6  

袁挺  李伟  谭豫之  杨庆华  高峰  任永新 《农业机械学报》2009,40(10)

研究基于近红外图像的黄瓜果实与茎叶的信息表达方法,有效实现了近色系生物信息的图像识别。分析了黄瓜采摘深度图像信息的特点,通过建立基于灰度相关与极线几何相结合的匹配策略实现了双目视觉下的黄瓜抓取点的立体匹配和三维重建。研究温室环境下不同时间光照强度变化特点,建立了光照分析模型,提高了不同光照条件下的导航线提取的适应性。试验表明机器人视觉系统能有效识别、定位果实的空间位置,定位误差控制在±5mm以内。  相似文献   

联合收割机割台总成的虚拟装配     

张艳飞  焦学健  柴山  任传波  王树凤 《农机化研究》2009,31(11)

研究了基于虚拟现实技术的联合收割机割台总成的虚拟装配.根据产品的装配结构模型,生成了联合收割机割台总成的装配结构树;采用UG建立了割台总成零部件的三维数字模型,导入到数字制造仿真软件,建立了总成各零部件的约束及装配关系,对割台总成进行了虚拟装配.  相似文献   

Effect of Chronic Ammonia Exposure on Energy Budget of Juvenile Soft‐shelled Turtle,Pelodiscus sinensis     

Runzhen Jing  Cuijuan Niu 《Journal of the World Aquaculture Society》2008,39(5):700-705

Abstract.— The present work investigated the effect of chronic ammonia exposure on energy budget of juvenile soft‐shelled turtle, Pelodiscus sinensis. Turtles (87.14 ± 4.00 g) were exposed to external total ammonia nitrogen (TAN) concentrations of C₀ (11.01 mg/L), C₁ (46.32 mg/L), C₂ (68.71 mg/L), and C₃ (97.0 mg/L), respectively, for 97 d at 29.5 C, pH 7.76. The ambient ammonia showed no significant influence on any component of the energy budget such as feed consumption, fecal production, excretion, standard metabolism, and growth. There were also no significant differences in body composition of the turtles among different treatments. Chronic exposure to ambient ammonia as high as 97 mg/L TAN did not affect energy budget of juvenile soft‐shelled turtle. The average energy budget for all turtles can be described as follows: 100 C = 9.3 F + 3.0 U + 74.6 R + 13.1 G, where C, F, U, R, and G represent energy intake, fecal energy, excretory energy loss, metabolism energy, and growth energy, respectively.  相似文献   

Effects of Dietary Vitamin C on Blood Chemistry and Nonspecific Immune Response of Juvenile Red Sea Bream,Pagrus major     

Tongjun Ren  Shunsuke Koshio  Orhan Uyan  Connie Fay Komilus  Saichiro Yokoyama  Manabu Ishikawa  Md Kadel Abdul 《Journal of the World Aquaculture Society》2008,39(6):797-803

A trial was conducted to determine the effect of ascorbyl‐2‐monophosphate Na/Ca (AMP‐Na/Ca) on blood chemistry and nonspecific immune response of red sea bream juveniles. Test diets with three levels of AsA (free, 107, and 325 mg/kg diet) were fed to juvenile red sea bream (36.0 ± 1.3 g) two times a day for 3 wk. There were no significant differences in hematocrit, glucose, and blood urea nitrogen. Total cholesterol and triglyceride in plasma of fish fed AsA‐free diet was significantly (P < 0.05) higher than that of fish fed two other diets. There were no significant differences in serum albumin, total bilirubin, and total serum protein. Glutamyl oxaloacetic transaminase in serum of fish fed diets containing 107 and 325 mg of AsA were significantly (P < 0.05) lower than that of fish fed AsA‐free diet. Serum lysozyme activity (LA) of fish fed diets containing 107 and 325 mg of AsA were significantly (P < 0.05) higher than that of fish fed AsA‐free diet. There was no significant difference in mucus LA. The results mentioned above demonstrated that AMP‐Na/Ca is a bioavailable AsA source for red sea bream juveniles. Supplement of more than 107 mg AsA/kg in diets improved blood chemistry and nonspecific immune function of red sea bream juveniles.  相似文献   

白菜白斑病的发生与防治     

苏慧兰  任丽民  吕佩珂 《长江蔬菜》2000,(1):19-19

白菜白斑病广泛发生于我国南北方,除为害白菜外,还为害十字花科的许多其他种,如甘蓝、油菜、菜薹、花椰菜、萝卜、芥菜、芜菁、小青菜、乌塌菜等,是一种分布广、寄主多的病害.主要为害寄主叶片,在叶上产生斑点,影响光合作用,从而降低产量.  相似文献   

人工诱变四倍体玫瑰香葡萄的遗传稳定性研究   总被引：8，自引：0，他引：8  

任清  罗耀武  柳术杰  张成合  祁碧淑 《园艺学报》2000,27(4):285-286

对人工诱变的两个同源四倍体玫瑰香葡萄单株－－四玫Ⅰ和四玫Ⅱ进行细胞组织学和遗传稳定性研究,结果表明：（１）经过连续３代的扦插,其组织发生层倍性结构没有变,四玫Ⅰ仍然是４－４－４型,四玫Ⅱ仍然是２－４－４型;（２）四玫Ⅰ和四玫Ⅱ的实生苗均为４－４－４型。  相似文献   

德国核桃‘No.120'幼胚胚轴与子叶体细胞胚胎发生及其植株再生   总被引：8，自引：0，他引：8  

汤浩茹  王永清  任正隆  G.Krczal 《园艺学报》2000,27(1):59-61

核桃 (Juglansregia)‘No . 12 0’品系授粉 7～ 8周的幼胚胚轴与子叶在含不同植物生长调节剂组合的诱导培养基上培养 4周后转移至无植物生长调节剂的继代培养基上培养 ,不同发育时期的体细胞胚直接形成于胚轴与子叶表面。子叶与胚轴分别在KT 2mg/L BA1mg/L IBA 0 .0 1mg/L与 2 ,4 D 2mg/L KT 1mg/L的组合的诱导下体细胞胚胎发生频率最高。体细胞胚经 3～ 5℃低温处理 2个月 ,31.6%的体细胞胚能发育成正常生长的植株  相似文献   

有效防治甜菜夜蛾的Bt毒素种类及其应用前景   总被引：1，自引：1，他引：0  

李倩  任相亮  胡红岩  姜伟丽  马亚杰  王丹  王莹莹  马艳 《中国棉花》2017,44(6):19-24

甜菜夜蛾对不同种类Bt毒素的敏感性存在差异。归纳总结了可有效防治甜菜夜蛾的Bt毒素种类、作用效果,并简述其应用前景,以期为提高Bt毒素对甜菜夜蛾控制力度提供依据。  相似文献   

转基因抗虫棉品种邯6203的选育及栽培技术     

任爱民  马维军  张玉娟  韩秋成  崔明晖 《中国棉花》2017,44(9):33-34

主要介绍棉花品种邯6203的选育过程、特征特性、产量、纤维品质、抗病虫性及栽培技术措施。  相似文献