X9313在播种机排种检测装置中的应用

本文论述了应用X9313自动调节CCD光电耦合装置的电源电压,从而使播种机排种检测装置能够在恶劣的田间作业中连续、可靠工作的设计思想。

精量穴播器排种性能检测方法研究分析及展望

棉花是新疆经济发展的支柱产业,播种装置的精量水平影响棉花的产量,精量播种最主要的方式之一是穴播,而播种器最主要的部位就是穴播器。因此,在播种机出厂前就要对穴播器的性能进行鉴定检测。本文综述分析了穴播器排种性能检测的四种方法,包括人工数种检测法、光电传感器检测法、高速摄像检测法和机器视觉检测法。通过对比这四种穴播器排种性能检测方法,分别提出了四种检测方法的优缺点,并指出依靠机器视觉法检测穴播器的排种性能任然是未来发展的趋势,对于提高精量穴播器排种性能的检测水平、推进穴播器的研制具有重要意义。

播种机多项性能检测及图形打印装置

开发了一种基于 80 31单片机的播种机多项性能检测装置。该装置具有脉冲计数、统计计算、显示打印等功能。结合不同的传感器 ,可以完成播种机排种均匀度和排种数、排种器轴的转速、拖拉机前进速度、播种机地轮滑移以及拖拉机驱动轮滑转等多项检测。速度检测能够打印曲线 ,排种检测除能打印统计数据外 ,还能够以点阵图形打印出种子在种沟分布的田间效果模拟图。

Conditional Mutations in Drosophila

The aim of this study was to obtain unusual mutations called conditional. The mutations manifest in some, not all representatives of a species. Collections of these mutations in chromosomes X, 2, and 3 of Drosophila melanogaster were established. Sex of fly or chromosomal rearrangement was the conditions providing ＂manifestation-non manifestation＂ of these mutations. The mutations differ from the usual by a set of properties. The salient differences in addition to conditional manifestation include： manifestation dependence on the spatial arrangement of chromosomal material in the genome, parental effects （maternal or paternal） of the mutant, capacity for transferring the genome from stable to unstable state. It is suggested that conditional mutations are mutant variants of Drosophila regulatory genes contained by the large Genomic Regulatory Network of Drosophila. Thus, the genes of this category can be detected by using special breeding procedures, mutations of these genes have unusual manifestation.