活套关联系统建模及滚动时域控制

本文分析了热连轧活套系统下游机架轧制速度对活套张力系统的影响和热连轧多机架协同工作的特性,建立了活套关联系统模型;基于分散控制思想,为每个活套系统单独设计控制器.对于每一个活套子系统,活套高度和张力是强耦合系统,本文采用一类基于滚动时域优化原理的多路控制策略,在每个周期内顺序求解活套高度和张力子系统的控制律后及时更新系统,从H∞观点出发,将解耦问题转化为干扰抑制和多目标优化问题.仿真结果证实了该方法具有良好的解耦效果和控制特性.     

2150mm精轧导卫及活套装置

介绍2150mm精轧导卫及活套的结构特点。该导卫结构上在国内外技术领先。     

Synergism of an insect sex pheromone specialist neuron: Implications for component identification and receptor interactions

Extracellular recordings show that the response to the sex pheromone component, (Z)-7-dodecenyl acetate (Z7–12:Ac) by the HS(a) antennal olfactory specialist neuron of the cabbage looper,Trichoplusia ni (Hübner), is synergized by two synthetic sex pheromone analogs and two components of the female sex pheromone. Complementary behavioral measures of upwind flight and copulatory responses to mixtures ofZ7–12:Ac with the analogs and sex pheromone components in a wind tunnel produced behavioral evidence consistent with the neuron's electrophysiological responses. The phenomenon of receptor neuron synergism impacts several areas and provides a note of caution for common practices of identifying secondary sex pheromone components only from field traps and/or wind tunnel tests.     

Acidic fog-induced changes in host-plant suitability

Phaseolus lunatus L. (Henderson Bush lima beans) were exposed to 2 hr acidic fogs with 2.51.0 (v/v) nitrogen-sulfur ratio typical of the west coast of the United States. Fogs with pH values of 2.0 (P < 0.01,t tests), 2.5 (P < 0.05), or 3.0 (P < 0.01) increased percent total nitrogen (dry weight) of foliage as compared to plants subjected to control fogs with a pH of 6.3–6.5. Fresh weight concentrations of soluble protein and certain free amino acid concentrations were increased by plant exposure to acidic fogs with a pH of 2.5 (t tests,P < 0.05). Concentrations of free amino acids considered essential for insect growth, as well as nonessential and total free amino acids were not significantly affected by any treatment (P > 0.05,t test). Water content (%) of foliage was not changed significantly (P > 0.05,t test) by exposure to any of the fogs.Trichoplusia ni (Hübner) (Lepidoptera: Noctuidae) larvae ate significantly more foliage and gained significantly more weight on plants treated with 3.0 pH fogs (P < 0.01,t test). Several potential explanations are offered for the lack of significant weight gain by larvae on plants in which soluble protein levels, free amino acid concentrations, or percent total nitrogen contents were enhanced by acidic fogs with a pH of 2.5 and 2.0. No larval feeding preference was detected for foliage exposed to acidic versus control fogs, and no significant differences were detected in percent survival ofT. ni eggs exposed to acidic or control fogs. Some implications of acidic fogs for population dynamics ofT. ni are discussed.     

川威950热轧带钢精轧区自动控制系统

川威950热轧带钢精轧区自动控制系统采用PLC控制,主要实现速度级联控制、张力控制、活套控制、APC等。投入运行后,满足生产需要,达到设计要求。     

一种提高热连轧机液压活套系统伺服控制响应速度的方法

针对带钢热连轧过程中液压活套系统伺服控制的快速响应问题,分别建立了液压活套伺服控制系统在压力控制、速度控制和位置控制三种不同工作方式下的系统结构图,并给出了它们的传递函数,提出了基于内模补偿的方法,即对第一种工作方式的4个环节或根据负载的变化分别采用不同的补偿措施进行补偿,对后两种工作方式采用自适应前馈因子的方法进行补偿。该方法基于不同的自适应因子对传递函数时变非线性项实施前馈补偿,可提高控制系统的响应速度,应用于生产实际。     

Responses of Japanese Giant Looper Male Moth to Synthetic Sex Pheromone and Related Compounds

The Japanese giant looper, Ascotis selenaria cretacea, is a serious defoliator of tea gardens in Japan. In Mie Prefecture male moths were dose-dependently attracted to rubber septa baited with 0.1–10.0 mg of the sex pheromone component (Z,Z)-6,9-cis-3,4-epoxynonadecadiene. Monitoring by pheromone traps showed three flight periods (June, July, and August–September). A septum with a 1-mg dose was still active after exposure for over three months in the field, but the number of males captured by the old lure was one fifth of that captured by a fresh lure. The parent 3,6,9-triene, a minor pheromonal component, showed a synergistic effect on male attraction when mixed with the pheromonal epoxydiene at a very low ratio, but the 1:1 mixture hardly captured any male moths. Attraction was also effectively inhibited by the positional isomers (6,7- and 9,10-epoxydienes), which exhibited rather strong electrophysiological activities on the male antennae. When these related compounds were placed around a trap baited with the synthetic pheromone, the number of captured moths remarkably decreased, which indicates the possibility of using the compounds as a disruptant.     

莱钢宽带热连轧活套控制技术的设计与应用

文中阐述宽带热连轧精轧控制系统中的活套控制系统,对活套张力和高度控制作较为全面和深入的研究,为企业取得良好的经济效益提供可靠的技术基础.     

平转立切分活套器的改进

针对棒材切分轧制中平转立切分活套器和出口导管易发生堵钢事故以及导管寿命短的问题,福建三钢（集团）有限责任公司棒材厂通过改进,使双线轧件的平转立扭转在全长为3030mm的活套架内缓缓完成,减少了轧件拐弯和上爬的角度,并将双线出口喇叭导管由原带喇叭口的、长850mm的扭转圆导管改成长650mm的方锥喇叭方管,不仅减少了活套器内的堵钢事故,还延长了出口喇叭导管寿命。     

Pheromone hydrolysis by cuticular and interior esterases of the antennae,legs, and wings of the cabbage looper moth,Trichoplusia ni (Hübner)

Examination was made of the hydrolytic activities of esterases obtained from the antennae, legs, and wings of 3-day-old cabbage looper moths,Trichoplusia ni (Hübner), by elution and by homogenation of those appendages. Pheromone hydrolysis in 1-min assays was monitored by use of tritium-labeled (Z)-7-dodecen-1-ol acetate and thin-layer chromatography to separate the reaction products. Listed according to the activities of the esterases obtained by homogenation, the organs were antennae > legs > wings. In contrast, the order according to the activities of the eluted esterases was wings > legs > antennae. Also, the eluted enzymes were less active than the esterases obtained by homogenization. The relatively high pheromone-hydrolyzing activity present in homogenized antennae suggests that the esterases originated inside the antennae and lends support to the hypothesis proposed in earlier investigations that pheromone-inactivating enzymes may play an important role in the olfactory process, possibly by clearing pheromone from the vicinity of the olfactory receptors. The esterases detected on the cuticle, on the other hand, may function by preventing surface accumulation of pheromone. The higher measured esterase activity in homogenates of prothoracic legs than of mesothoracic or metathoracic legs suggests that the prothoracic legs, which are used to clean the antennae of debris, may function by removing and degrading pheromone from the surface of antennae.Mention of a commercial or proprietary product does not constitute an endorsement by the USDA.