因素法与修正法在农用地定级中的探讨研究

本文以江西省永修县农用地定级为例进行比较研究,探讨因素法与修正法在定级指标体系、技术流程、评价结果上的共性和差异。此外,本文通过分析级别空间区分度和级别空间重叠等,总结出了两种定级方法的优缺点和适用范围。     

自适应UKF算法在GNSS/INS深组合系统中的应用

针对强非线性和时变噪声统计特性不明的高动态运动环境下全球卫星导航系统/惯导系统(GNSS/INS)深组合导航系统滤波精确度较差甚至发散的问题,提出一种自适应混合无迹卡尔曼滤波(UKF)算法。该算法以UKF算法为基础,采用混合滤波思想对UKF滤波算法进行简化;并根据高动态下系统量测噪声时变,且易快变、突变的特点,设计了一种基于渐消记忆指数加权的自适应量测噪声估计器,实时估计和修正噪声统计量并自适应调节估计周期。仿真结果表明,在量测噪声变化的情况下,相比于常规UKF算法,本文算法各向定位测速精确度均有所提升,水平方向精确度提升60%以上,效果明显;此外,算法耗时减少18.64%,说明本文算法能够在提升滤波精确度的同时减少部分计算量。     

Super-hydrophobic film deposition by an atmospheric-pressure plasma process and its anti-icing characteristics

In this work, the super-hydrophobic (SH) surface was prepared through chemical vapor deposition process by an argon atmospheric pressure plasma jet source with HMDSN (hexamethyldisilazane) as the polymerization precursor. Plasma synthesized organosilicon (SiO_xC_yH_z) thin films with water contact angle over 160° and sliding angle below 5°, were able to be achieved. FTIR and XPS analysis indicates a large number of hydrocarbon compositions were polymerized in the thin films enduing the latter very-low surface free energy. SEM shows the SH films display micro-nanostructure and with high degree of averaged surface roughness 190 nm evaluated by AFM analysis. From experiments under controlled low-temperature and moisture conditions, the prepared SH surface exhibits good anti-icing effects. Significantly prolonging freezing time was achievable on the SH thin films for both static and sliding water droplets. This investigation demonstrates the anti-icing potentials of SH surface prepared through low-cost simple atmospheric-pressure plasma polymerization process.     

加酶制备燕麦麦汁的正交试验研究

以燕麦为辅料制备麦芽汁,采用正交试验设计研究酶的添加量、添加阶段、作用时间、辅料添加量对麦芽汁品质的影响。结果表明,NSP酶的添加量对麦汁的过滤时间、糖化时间、α-氨基氮含量、还原糖量和收得率均有显著性影响（p〈0．05）,NSP酶的添加阶段和燕麦添加量均只对麦汁中仅一氨基氮含量有显著性影响（p〈0．05）,而NSP酶的作用时间对测定的理化指标均无显著性影响（p〉0．05）。最佳工艺条件为NSP复合酶添加量为0．24％,燕麦添加量为30％,NSP复合酶在蛋白质休止的第一阶段（45℃）添加,保温23min。