Optimal Nesting for Continuous Shape Stamping Processes

IntroductionTwo-dimensionalshapesshouldbenestedonametalcoiltominimizethescrapormaximizethematerialutilizationratio.Incontinuousshapestampingprocesses,shapesarenestedseveralblanksperpunchandthepatternisrepeateddownthelengthofthecoil.Atypicalnestingproblemisthepackingforbicyclechainlinkblanksonasheetmetalcoil.Today,mostnestingarrangementsaredonemanually.Avarietyofmethods[17]havebeenproposedtoautomatetheblanknestingprocess.ThispaperdescribesimprovementstothemethodproposedbyJainetal.[1]andasoftw…     

Nesting dynamic and sex allocation of the oil-collecting bee Centris (Heterocentris) analis (Fabricius, 1804) (Apidae: Centridini)

The study of nesting biology is an important biological aspect for both conservation and management, but despite this, only a few of the over 20,000 described bee species have had their nesting biology studied. The aim of this study was to describe and analyse the nesting biology and dynamic of an aggregation of the cavity-nesting bee species Centris analis during one generation. Twenty-eight females were marked and had their nesting activities documented, 64 nests were sampled, and 113 individuals emerged from these nests. An asymmetry in the sex allocation was observed for this species, and the sex ratio was male-biased in the first nests built. Nonetheless, considering an individual-level perspective, the females showed different strategies, with some of them producing more daughters, other females producing more sons, and still others producing an equal proportion. The productivity per female was low compared to that of other solitary bee species, and the females displayed an aggressive usurpation behaviour against conspecific females and performed an intraspecific parasitism. As the substrate used to nest is a limiting factor for this species, the usurpation behaviour may be an important strategy that could increase the chance of nesting. A few males used the nesting site as a resting place and the fidelity observed to this locale was high. This study provides new information about the natural history of this bee species, which is an important pollinator of both crops and native plant species.     

浸润推理技术与环境保护建模

提出了伸缩嵌套技术，并用于建立浸润推理网域。提出邻域关联激发技术、节点疲劳技术，实现浸润推理。最后，通过一个环境保护模型，演示了浸润推理     

Two-dimensional nesting system based on hybrid genetic algorithm

According to the cutting stock problem of 2-dimensional shapes, a nesting system (NS) based on hybrid genetic algorithm (HGA) is established. The system optimizes the sequence and angles of polygons with hybrid Genetic Algorithm to accomplish the superior solution. It nests the irregular shape directly without covering irregular shapes with rectangle. It also improves the decoding strategy of 2-dimensional shapes nesting based on classical bottom-left strategy, makes the new strategy be universal to convex polygons, concave polygon and line-circular composted polygons. Foundation item: Supported by the National Key Technology and Equipment Project of the 10th Five-Year Plan (ZZ02-03-03-01)     

Deep sea swimming crabs of the Charybdis miles species group in the western Indian Ocean (Crustacea: Decapoda: Portunidae)

The deep-sea species of the Charybdis miles group occurring in the western Indian Ocean are revised on the basis of recent collections obtained by German and Russian expeditions. Two new species are described, Charybdis meteor sp. n. from the Straits of Bab el Mandeb and Charybdis crosnieri sp. n. from the insular margins and seamounts of the western Indian Ocean, which has been previously identified as Charybdis sagamiensis Parisi, 1916. The C. miles group represents a lineage with a probably relatively recent tendency for submergence which culminated in the formation of C. acutidens Türkay, 1986, a characteristic species of the deep Red Sea water mass.     

PC/ATX 中断控制系统使用性能的探究

通过使用不同的中断请求线进行中断或中断嵌套服务的操作实验，结果表明：IRQ2仍可作为独立有效的中断请求线使用；空闲的IRQ10、IRQ12和IRQ15都是外部中断源可选用的有效中断请求线。本实验结果为合理、有效地应用PC／ATX系统的中断控制资源提供了可靠的实验依据。     

惯性测量单元全自动简易标定台设计

针对传统惯性器件标定台价格昂贵且体积庞大的问题,该文提出了一种全自动简易标定平台.以传统“三轴嵌套”模式为基础,设计了标定台的机械结构;考虑惯性传感器中的误差因素,建立了相应的线性误差模型,通过拟合载体坐标系下的输出和IMU传感器的输出获取误差参数,得到IMU在载体坐标系下的输出;以MPU9250芯片为基础,根据六位置标定法,得出芯片中陀螺仪与加速度计的标定结果.将标定后的MPU9250与高精度的MTI-300进行了对比分析,并结合人体行走定位实验,检验了标定效果.结果表明：该文设计的简易标定台能够有效提高IMU的测量精度,与商用系统相比整个系统欧拉角测量误差均方根降低至3.5以下.     

面向集中下料的钣金排样编程系统

研制了一个面向钣金集中下料生产模式的优化排样及数控切割／冲孔机编程系统ＡｕｔｏＣＵＴ,该系统集成了钣金自动排样、交互排样、工艺设计、图形自动编程,以及下料零件库的建立与管理、下料计划的自动生成、下料信息管理等功能．详细说明了ＡｕｔｏＣＵＴ系统的总体结构及运行流程,面向对象的数据结构和系统主要功能模块．     

Nesting behaviour and prey of Pseudoplisus Ashmead (Hymenoptera: Sphecidae)

Nesting behaviour and prey of two species of Pseudoplisus, a gorytine wasp genus in the sphecid subfamily Nyssoninae, are described. P. natalensis is a solitary nester in southern Africa nesting often in the soil in flower-pots. P. ranosahae in Madagascar nests in the ground in large aggregations. Both species show a high degree of prey specificity. Nests are provisioned only with large adult froghoppers (Aphrophoridae), P. natalensis preying on Ptyelus grossus and P. ranosahae on Ptyelus goudoti.