大豆玉米带状复合种植分带式喷杆喷雾机设计与试验

【目的】解决大豆玉米带状复合种植模式下植保作业机械化配套问题,降低人工劳动成本,提高植保作业效率,减少雾滴带间漂移造成的药害问题。【方法】结合黄淮海地区大豆玉米带状复合种植农艺要求,设计了大豆玉米带状复合种植分带式喷杆喷雾机,并通过理论计算、虚拟仿真等确定了四轮驱动高地隙底盘、轮距调节装置、双喷雾系统、水平折叠式升降喷杆装置和防漂移装置的主要结构参数。【结果】经样机试制及田间试验,该装备作业通过率平均值为(99.38±0.14)%,大豆带喷头喷雾量平均值为(1.196±0.055)L·min^(-1),变异系数为4.6%;玉米带喷头喷雾量平均值为(1.213±0.043)L·min^(-1),变异系数为3.5%。大豆玉米带状复合种植分带式喷杆喷雾机的行驶速度建议为3~5 km·h^(-1),且该参数范围内玉米带间和大豆带间的雾滴漂移沉积密度随行驶速度的增加而逐渐增多,最高值分别达到(2.11±0.62)和(2.68±0.55)个·cm-2。【结论】大豆玉米带状复合种植分带式喷杆喷雾机能满足大豆和玉米高低位带状分布的植保作业需求,并为农作物复合种植模式植保机械的研发提供设计经验和技术参考。

Performance of a double sided silicon strip detector as a transmission detector for heavy ions

The performance of a double sided silicon strip detector （DSSSD）, which is used for the position and energy detection of heavy ions, is reported. The analysis shows that although the incomplete charge collection （ICC） and charge sharing （CS） effects of the DSSSD give rise to a loss of energy resolution, the position information is recorded without ambiguity. Representations of ICC/CS events in the energy spectra are shown and their origins are confirmed by correlation analysis of the spectra from both the junction side and ohmic side of the DSSSD.