小豆抗锈病诱导剂的筛选

Four common inducers, salicylic acid (SA), 1-aminocyclopropane-1-carboxylic acid (ACC), benzothiadiazole (BTH) and methyl jasmonate (MeJA), were selected to evaluate the effects of inducers on the resistance of adzuki bean to rust by investigating urediospores germination and the adzuki bean resistance to Uromyces vignae. The results showed that four inducers had no effects on the urediospores germination. However, they can significantly induce adzuki bean resistance to U. vignae. Among these four inducers, 0.25 mg·mL^-1 ACC can significantly reduce the disease index, which was 45.06% lower than the control. Aditionally, seedlings treated with ACC exhibited a typical "triple reaction", which indicated that this induced resistance may relate with the endogenous ethylene biosynthesis in adzuki bean. Then the adzuki bean seedlings were treated with an ethylene receptor inhibitor, 1-methylcyclopropene (1-MCP) alone or combined with ACC. The results showed that 1-MCP alone had no significant effect on the growth and rust resistance of adzuki bean. However, 1-MCP could eliminate the "triple reaction" and did not affect the induced resistance caused by ACC when it used combined with ACC. Results obtained in current study suggested that ACC can significantly induce the resistance of adzuki bean to the rust. Moreover, we speculate that ACC-induced rust resistance of adzuki bean may not depend on ethylene signaling pathway.     

高速计数器在定尺剪切中的应用

文章介绍了OMRONC2 0 0HS可编程序控制器的高速计数器CT0 0 1的特性 ,叙述了CT0 0 1在开卷线定尺剪切中的应用 ,给出了有关高速计数器梯形图。     

高速逆流色谱在中药有效成分分离中的应用研究进展

中药有效成分分离是目前非常重要和活跃的研究领域,从中可以发现和利用重要的活性成分。在该领域中新技术的研究和应用一直是人们研究的热点。文中对高速逆流色谱用于分离中药有效成分的溶荆系统选择、采用该方法分离的中药有效成分以及分离手段等方面的研究状况进行了综述,并展望了该领域的研究前景。     

多级泵内固液两相流可视化试验测试

为研究多级泵内固液两相流规律,搭建了泵内固液两相流可视化测试系统,对清水工况下及输送不同物性参数颗粒时泵能量性能及颗粒运动规律进行了测试.测试结果表明:泵输送固液两相流时的扬程和效率相较于清水工况均有所降低,并且随着颗粒粒径和密度的增加,降幅逐渐增加;与输送清水相比,泵送球形颗粒时的扬程和效率最大分别低了0.32 m和2.92%.导叶流道内不同物性的球形颗粒均有向导叶工作面运动的趋势,且颗粒轨迹长度和颗粒进入导叶时的位置有关,颗粒进入导叶的位置越靠近导叶背面其运动轨迹越长;颗粒密度和粒径越小,颗粒在流体中的跟随性越好,其运动轨迹越光滑;在导叶进口区域,颗粒主要从导叶背面位置进入导叶流道,并且从该位置进入导叶内的颗粒比例随着颗粒粒径的增加逐渐降低,随着颗粒密度的增加先增加后降低.颗粒与导叶头部碰撞的概率随着粒径的增加逐渐增加,随着密度的增加逐渐降低.     

前插式双控差速行星系分插机构的运动特性及参数分析

针对传统高速分插机构均为多组非圆齿轮组成,安装和制造难度较大等问题,提出了一种双控差速行星系分插机构。分析了该分插机构的工作原理并建立其运动分析模型;采用RecurDyn虚拟样机仿真和MATLAB数值仿真等方法,对该理论分析模型和机构各参数与秧针栽插动静轨迹之间的关系进行研究。选取椭圆齿轮偏心率为0.13、插植臂长度135mm、插植臂箱体与y轴的初始夹角50°、插植臂与回转箱体的初始夹角35°和插植臂回转箱体回转半径90mm进行分析,结果表明:插秧株距为180~220mm时该分插机构能满足水稻插秧要求。     

番茄红素的生物诱导合成

果蔬采收后经生物诱导剂浸涂处理，结果表明：西红柿中番茄红素额外增加４５％，柑桔中番茄红素额外积累成倍增加。理论上推测番茄红素的额外积累是抑制类胡萝卜素环化酶的结果。     

动荷载对重力式路堤墙影响的研究

随着我国高速铁路迅猛发展和原有普通铁路的提速,动荷载对支挡结构影响显著增大,现有的设计计算理论是否满足新条件要求,是现在的设计单位和科研单位需要解决的问题.为了弄清动应力对支挡结构的影响大小及范围,我们设计了实尺寸的动态试验模型,通过实验实测得到了不同的距离、不同加载幅度下的荷载图示.并据实验数据及现有的计算理论提出了减小动土压力的措施,且用挡土墙中两个重要参数Kc,Ko做了验证.     

金鹿三眠素对家蚕的生理调控和三眠种制造技术

金鹿三眠素在幼虫３、４龄初期添食，可使四眠蚕诱变为三眠蚕；在幼虫末龄中后期添食，可增加茧层量和产丝量．用三眠素诱导原蚕三眠化制造三眠种，可增强体质、节约用桑、减少不产卵蛾、少产卵蛾、不受精卵和残存卵，提高制种量．所制三眠种下代不添药，仍为四眠蚕其产质量不受影响     

High-speed centrifugation of extender of freeze-thaw boar semen

In semen cryopreservation, egg yolk is still widely used as a non-penetrating cryoprotectant. Much has been developed in the search for alternatives for this biological product. This work aimed to evaluate the processed egg yolk through ultracentrifugation and/or sonication in the cryopreservation of swine semen. Twenty-seven semen doses were purchased from a commercial boar stud and processed for cryopreservation using egg yolk lactose 11% (control) extender, processed using two different methods: high-speed centrifugation and sonication. Then, they were submitted to freeze-thawing protocol and were assessed for kinematic and cell structural parameters. Samples in which extenders underwent centrifugation had better results in velocity parameters, meanwhile those that only sonication was performed had poorest results in this parameter. The preservation of the membrane and mitochondria structure had better results when the diluent was only centrifuged in comparison with the other treatments. Therefore, centrifugation of extender containing egg yolk is important for better cryopreservation of swine semen.     

椭圆齿轮行星系分插机构推秧装置的动力学模型的建立及验证

为了建立高速水稻插秧机椭圆齿轮行星系分插机构的动力学模型，必须分析推秧装置对该机构的作用。该文采用作者推导的解析形式刚体复合运动微分方程对该机构的推秧装置进行动力学分析，推导出推秧装置的动力学模型。通过编程计算得到：①推秧和碰撞过程行星架转角与拨叉转角及推秧杆位置的关系，并由高速录像验证；②在推秧和碰撞过程拨叉转动中心受力、推秧杆对栽植臂作用力和弹簧作用力与行星架转角的关系，为分析整个分插机构的动力学特性奠定基础。