多轴联动数控双面铣床控制系统设计

针对异形木制零件的结构特点,制定零件双面加工的工艺方案和机床设备的设计方案;针对工艺要求对机床结构进行详细设计,介绍各机构的工作原理及过程。根据机床控制方案,设计基于"PC+运动控制器"开放式控制系统,完成系统硬件包括PC、运动控制器和伺服系统的设计以及系统软件包括PLC梯形图、PC应用程序等的设计,实现DXF文件的读取、NC程序的生成、加工路径的离线模拟、状态监控、手动/自动控制以及参数设置。实践证明,多轴联动数控双面铣床自动化程度高、操作简便、性能稳定。     

基于颜色掩膜网络和自注意力机制的叶片病害识别方法

为了提取到更加准确、丰富的叶片病斑的颜色特征和空间特征,解决病害严重程度细粒度分类粗糙、识别准确率低等问题,提出一种融合颜色掩膜网络和自注意力机制(Fusion color mask and self-attention network, FCMSAN)的病害识别方法。FCMSAN由颜色掩膜网络(Color mask network,CMN)和融合通道自适应的自注意力网络(Channel adaptive self-attention network, CASAN)构成。CMN通过学习叶片病斑颜色区域信息提高模型提取颜色特征的能力;CASAN能够提取全局范围内的病斑特征,同时加入病斑的位置特征和通道自适应特征,可以精确、全面定位叶片病斑区域。最后通过特征转换融合模块（Transfer fusion layer,TFL）将CMN和CASAN进行融合。经实验证明,FCMSAN在61类农作物病虫害细粒度识别中,Top-1的分类准确率达到87.97%,平均F1值达到84.48%。最后通过可视化分析,验证了本文方法在病害识别中的有效性。     

施磷量对增氧条件下水稻根系酸性磷酸酶活性及产量的影响

【目的】探讨水稻根系酸性磷酸酶活性对增氧条件下施磷量的响应机制,明确水稻产量与根系酸性磷酸酶活性的相关性。【方法】以杂交水稻C两优608为材料进行盆栽试验,设置4个磷肥(P2O5)施用水平,P1(0 g/株)、P2(3.23g/株)、P3(6.46 g/株)、P4(9.70 g/株),分蘖期至灌浆期设置2种灌溉方式,即NO(不增氧灌溉)和O(增氧灌溉),测定了水稻根系酸性磷酸酶活性和产量指标,分析了根系酸性磷酸酶活性与产量的响应关系。【结果】随着施磷量的增加,增氧条件下理论产量、有效穗数与千粒质量均先降低后升高,而每穗粒数呈现先升高后降低趋势;分蘖期与拔节孕穗期根系酸性磷酸酶活性随施磷量的增加而降低,灌浆期根系酸性磷酸酶活性呈现先升高后降低;增氧条件下千粒质量与灌浆期根系酸性磷酸酶活性显著负相关,结实率与拔节孕穗期根系酸性磷酸酶活性显著正相关。【结论】不外加磷肥情况下,增氧方式可显著增加水稻理论产量、有效穗数及千粒质量,施磷量的增加反而抑制水稻产量形成,6.46 g/株(90 kg/hm2)为增氧条件下理论产量、有效穗数、千粒质量、每穗粒数阈值,根系酸性磷酸酶活性是增氧条件下水稻响应根际增氧及磷素吸收的重要指标。     

基于土石方平衡的面板堆石坝料场开采建模研究

混凝土面板堆石坝的主体是坝体堆石料,料场开采需求分析与管理在面板堆石坝施工中至关重要,若没有充足的填筑料源,就不可能顺利施工,也就不可能实现工程整体施工的综合优化。为了实现整体工程施工快速、强度合理、经济节约的目标,通过仿真建模研究,结合土石方平衡调配过程,建立起了料场开采与土石方调配联合模型,并对料场开采需求进行实时动态模拟和管理控制,可为工程设计以及施工提供快速方便的管理平台以及可靠的数据支持与决策支撑。     

有机废水处理中的高级氧化技术

综述了高级氧化技术的原理,介绍了O3/UV、H2O2/UV、O3/H2O2组合过程、化学氧化技术及电化学氧化技术五种典型的高级氧化技术,阐述了高级氧化技术降解有机污水的机理以及在水处理中的应用进展。指出了高级氧化过程应用领域应扩展到水体中难降解的持久性有机污染物,并应加强高级氧化过程所需新型反应器的研制,以便进一步强化废水的降解,提高其处理效率。     

A calculation method of the stiffness of face gear tooth and analysis of its influence factors

Tooth stiffness of face gear is one of the components of meshing stiffness of face gear drives. Its resolve can build excellent base for calculation method of meshing stiffness and analysis of dynamic for face gear drives. Based on Buckingham’s standpoint, along the length direction of the tooth of face gear, any one of its sections can be considered as a section of rack with varying pressure angle. According to above theory, the tooth form of face gear is simulated successfully. The method of calculation of the tooth’s stiffness of face gear is obtained. Compared with conclusion of tooth’s stiffness by FEM in the same parameters, it is proofed to be correct. Through analysis of influence of tooth’s stiffness by main design parameters of face gear, the benefit conclusions are drawn. That is, the changing ratio of tooth’s stiffness decreases with the increase of module, and the tooth’s stiffness increases with the increase of pressure angle but the changing ratio almost remains constant. The tooth’s stiffness increases with the increase of tooth width and the influence of changing ratio from tooth root to tooth crest is bigger than that of pressure angle.     

The chloride mask in COD determination of pickled mustard wastewater with high salt

Chlorides in the wastewater with high salt seriously interrupts the determination of chemical oxygen demand(COD). Therefore, chloride mask in wastewater has been an important and difficult issue in recent years. In the present work, experiment design is used for more accurate and precise COD determination method of pickled mustard wastewater. Two methods for masking chloride are adopted: HgSO4 masking method and AgNO3 masking method. After masking chloride, use the traditional reflux digestion method to test COD in the experimental sample. The results show that when the ratio of HgSO4 to Cl - is 40, the chloride mask results in a minimum error of 1.43%, and the minimum error is 0.21% when AgNO3 is used. Obviously, AgNO3 masking method is superior to HgSO4 masking method. However, when these two methods are used in pickled mustard wastewater, there is a COD value difference of 20 mg/L and HgSO4 masking method is more accurate. By considering the characteristics of the two methods above, a combined method is proposed, which AgNO3 is added equivalently according to the concentration of Cl - first, and then a few amounts of HgSO4 are added to prevent the free Cl - in wastewater. The facts show that combined method is more reliable.     

Analysis on Oylindrical Worm in Traction Machine and Modifications

Cone enveloping cylindrical worm in traction machine as instance, theoretical analysis on cylindrical worm transmission has been theoretically analyzed, and efficiency test and load capability test of traction machine with YJ240 cylindrical worm have been done on open power gear experimental instrument. According to the experimental data, it indicates cylindrical worm have some weaknesses on load capability, efficiency, adjustment possibility of tooth backlash and so on. Therefore, on purpose of improving integral performance of traction machine, face worm with variable tooth thickness may be used as primary drive mechanism in traction machine instead of cylindrical worm.     

Experimental Study of a Novel Detector''s Technique for Industrial X-ray Computed Tomography(CT)

Detector, influencing on system's performances, is one of some key techniques in x ray industrial computed tomography (CT) systems. Considering the existing problems for sensor (or detector) in CT systems, a new sensor is experimented by using optoelectronic integrated technique with optic fiber face plate optically coupling and transmission, and it is proved to be high integrated, high efficiency, high resolution, and low cost in industrial CT systems.     

昆明市主要城镇面山及交通沿线荒山荒坡现状与造林绿化对策

介绍昆明市主要城镇面山及交通沿线荒山荒坡分布面积及分布特点,分析荒山荒坡造林绿化存在的主要问题,认为要采取因地制宜,科学规划;以乡土树种为主,适地适树;超常规整地;加大造林密度,合理配置树种;加强抚育管护,封山育林;加强组织领导,加大资金投入,完善机制等对策措施,以保证造林绿化成功率。