光(门东)对测量精度影响的研究

本文以实验为基础,提出在工具显微镜类仪器中,为了提高测量精度,应如何正确使用光(门东)。     

GPS系统与全站仪的组合测量

在某项测量课题中,为准确测量大批量待测点的大地坐标,利用"大地测量型GPS"准确地测量出基准控制点,并利用"全站仪"测量其余标志点相对控制点的坐标,在通过计算得出这些点的大地坐标。通过该方法,避免了繁琐的测量过程,使数据测量和处理的时间周期大大缩短。     

天利公司生物质能的应用实践

辽宁天利金业有限责任公司投资300余万元,对原供热系统进行改造。通过余热回收机组充分利用生产过程中产生的生物质能,满足了公司冬季生产及生活供暖,提高了可再生能源使用效率,降低企业能源成本,改善了周边的环境质量。该回收机组环保、节能、运行可靠,年节约成本约83万元,减少CO2排放量约2 300 t,经济效益、环保效益和社会效益显著。     

机械构件运动瞬态参数测量原理及测量仪器设计

本文介绍了用脉冲细分法测量机械构件的运动误差、转速、速度和加速度的测量原理,分析了可能产生的误差及提高测量精度的方法,并给出了相应的逻辑设计框图。该仪器可测量机床的扭振和爬行,可以进行传动链分析及机构的运动学和动力学分析。     

Cytological Effects of Space Environment on Different Genotype of Rice

For exploring the biological effect of space environment on different genotype of rice seeds, the cytological effects of M1 generation after space flight were studied. Twelve different genotypes of rice seeds which belong to different climate ecotype （early, medium and late） of indica and japonica were onboard ＂Shenzhou 4＂ spaceship for 162 h. After recovered the total number of mitosis cells and chromosomal aberration were observed. In all the lines the mitotic index （MIs） of space flight are much higher than control, which indicates the stimulate effect of space environment. The cell rate of chromosomal aberration （CRCA） of space flight is also much higher than control, but varies from line to line. It indicates that biological effect of space environment on rice seed dependents not only on flight duration but also on rice genotype. The radiosensitivities of different lines were also discussed according to CRCAs.