共查询到20条相似文献,搜索用时 62 毫秒
1.
2.
3.
4.
为了设计与制造具有超滑功能的昆虫捕集滑板,基于OpenGL图形平台实现仿生光滑表面显微结构的仿真.利用扫描电子显微镜S3400N采集猪笼草叶笼超滑表面的蜡质显微结构图像,对提取的图像进行数值分析,建立Visual C++6.0编译环境下的OpenGL图形开发框架,实现了不同状态参数下蜡质晶体的可视化计算机仿真.仿真结果显示该仿真晶片的长度为(1.00±0.20)μm,厚度为(0.10±0.02)μm,高度为(1.00±0.70)μm.通过与猪笼草表面显微结构试验数据的比较,得出该仿真具有较高的精确度和良好的可操作性. 相似文献
5.
基于电磁波谱的生物诱变效应,分析探讨了农业病虫草害的物理防治新技术。害虫活性抑制与致死的激光诱变辐照试验获得了光功率阈值,激光管阵列集成设计获得了满足杀虫光功率的大面积激光杀虫器;蝗虫光电诱导试验证实了低波长光谱的趋光诱导敏感性,LED阵列集成光源及频振光场控制设计实现了蝗虫趋光诱导敏感性激发,在漏斗式光电诱导滑移捕集机试验中获得了85%的蝗虫滑移捕集率;激光辐照试验获得草害的高度温升和热灼烧致死,阵列结构激光杀灭器的圆柱坐标型机械臂液压驱动和行走机械设计形成了激光治理草害的光电机械化技术。 相似文献
6.
草地蝗虫吸捕机吹吸式吸嘴的试验研究 总被引:1,自引:1,他引:1
针对草地蝗虫吸捕机吸捕率低、蝗虫破碎等问题,在对原直吸式吸嘴进行理论分析的基础上,结合蝗虫在吸捕时的躲避特性以及对蝗虫悬浮速度的实验测定,设计了吹吸式吸嘴.在实验室条件下对吸口气流速度、吹口气流速度、吹口倾角、吹口宽度等影响吹吸式吸嘴回旋气幕形成的主要因素进行了试验研究,并与直吸式吸嘴进行了对比试验.试验表明:吹吸式吸嘴可将吸口气流速度从原来直吸式的20m/s降低为现在的14m/s,减轻了后续设备的负荷;与具有相同吸口气流速度的直吸式吸嘴相比,其轴向、径向吸捕距离分别延长到1.5~2倍,负压吸捕区增大到2~3倍,能够有效地吸捕蝗虫,提高了吸捕率. 相似文献
7.
针对水稻与甘蔗秸秆利用小型秸秆圆捆机收集打捆效率低的现状,研究了圆捆机卷捆室内打捆的情况,为圆捆机的结构改进提供必要的理论和技术依据。秸秆能否在卷捆室顺利形成草芯主要涉及辊子与秸秆的摩擦因数的问题。为此,利用自制的滑动摩擦因数测试装置,对秸秆进行摩擦特性试验研究,采用三因素三水平的正交旋转组合试验设计方案,探究秸秆含水率、取样部位以及滑板材料3个变量因素对摩擦因数的影响规律。结果表明:含水率对稻秆影响最大,滑板材料对甘蔗叶影响最大,3种滑板材料都是与橡胶的摩擦因数最大。由此得出:小型圆捆机卷捆室内下半部分辊子可以考虑选用橡胶沿着钢辊锯齿形凸起表面贴紧的方式,这种胶辊对快速形成草芯更有利。 相似文献
8.
9.
10.
随着蝗虫网棚养殖技术的发展成熟和养殖规模的不断扩大,传统的手工捕捉蝗虫的方式已不能满足实际要求,而现有的蝗虫吸捕机大多数是为了治理草原蝗灾而设计的,尺寸较大,无法在蝗虫养殖大棚内使用,因此设计一种轻便的适于在蝗虫养殖网棚内使用的小型蝗虫吸捕机就显得尤为重要。为此,首先,根据蝗虫的物理特性确定能够实现对蝗虫进行吸捕的各个基本条件,同时考虑到在网棚内使用所受到的尺寸大小限制,确定了总体结构的尺寸;然后,利用SolidWorks绘制各个工作部件的三维实体图,并利用SolidWorks的装配功能将各零部件装配成装配体。 相似文献
11.
12.
13.
14.
15.
《Journal of Agricultural Engineering Research》1998,69(3):249-254
A model to represent the discolouration of dried powder of carrots as a function of temperature was developed. Two types of carrots, Asian and European, containing large amount of lycopene and β-carotene, respectively, were tested. The dried powder was stored under an atmosphere with O2and at three different temperatures, 5,20 and 35°C. The surface colour of the powder was monitored during storage by a Hunter colour ratioa/b. In the proposed model, the rate of oxidation was assumed to be represented by the product of the fraction of concentration of oxidized pigment at arbitrary time and a specific rate of oxidation of pigment. The rate parameters in the proposed model were calculated by fitting the experimental data with smooth curves by trial and error at the end of the induction period but before discolouration took place. The frequency constant and activation energy, expressing the temperature dependence of the rate parameters, were expressed by the Arrhenius relation. The simulation results of a Hunter colour ratioa/bof dried powder at 25°C showed good agreement with the experimental data, suggesting that the proposed model was effective for the prediction of discolouration of dried powder of both types of carrot. The use of the induction period in the manner described may enable the shelf life of dried powder to be predicted. 相似文献
16.
17.
感官检验棉花的品级,这是农村常见的一种检测手段.它的一个主要特点就是存在不确定性.这是由于检验员的品级检验水平存在一定的差异,其中有很多因素制约着检验的结果.文章对影响感官检验结果的因素进行了系统的分析. 相似文献
18.
19.
The fractional outflow rate of water from the rumen, measured as the rate of disappearance of the chromium complex of ethylenediamine tetra-acetic acid, was related to a number of dietary factors. A multiple regression equation was derived which expressed fractional outflow rate as a function of the intakes of dry matter, ash, acid-detergent fibre and crude protein.The data analysed consisted of 243 observations for sheep on 59 diets, including forage, concentrate and mixed diets. The ranges covered by the data were: fractional outflow rate 0.7–3.6 day?1; dry matter intake 560–1400g/day; ash 4–30%, acid-detergent fibre 7–41%, crude protein 5–26 % of dry matter; there were no observations for sheep of less than 34 kg liveweight.The equation accounted for 56·3 % of the total variance. Between-sheep variance could not be calculated for the whole of the data but was undoubtedly substantial since, for a sixth of the data, it was known to account for 38 % of the total variance. 相似文献
20.
从灾害经济学的角度探讨了城镇供水优化调度的必要性和可能性,认为在缺水不可避免的情况下,对供水进行优化调度可以减小缺水带来的损失,产生较好的减灾效益,特别是可以大大减小严重干旱的灾害效应。并根据水资源的特性,提出了缺水损失的计算模式以及优化调度的原则和方法。 相似文献