积雪深度3D识别与数字摄影测量

为解决传统积雪深度测量方法投入大、耗时长、效率低等问题,基于SfM(structure from motion)技术提出一种无接触式的高精度摄影测量技术,应用风雪联合试验系统针对不同模型进行风雪联合试验,利用相机获取积雪分布照片,还原雪面的三维坐标并利用MATLAB编程提取雪面的空间分布数据,与钢尺实测数据对比来评价该测量方法的精度.对比结果表明:利用摄影测量法对简单形式屋面进行测量时,能将绝对误差控制在±2 mm,相对误差在1%以内;测量复杂屋面时,绝对误差可控制在±4 mm,相对误差约为3%,测量精度满足模型试验测量要求,且利用摄影测量技术对复杂屋面积雪分布测量工作效率有显著提高.     

冰雪道路橡胶颗粒沥青混凝土性能及应用研究

将废旧的橡胶轮胎制成橡胶颗粒加入到沥青混合料中,可以显著提高沥青路面的柔性,进而增强路面的弹性变形能力,是铺筑防冰雪路面的良好材料。橡胶颗粒沥青混凝土铺筑的路面不仅具有除冰雪的性能,还可以消耗掉大量的废旧橡胶轮胎。本文探讨了橡胶颗粒沥青混凝土的除冰雪机理、橡胶颗粒的掺配方法及混合料的配合比设计原则,并分析了其使用性能,认为采用橡胶颗粒沥青混凝土可有效解决冬季道路积雪结冰问题。     

振动清雪铲静动态强度分析

振动清雪铲可以把压实的冰雪振碎、抛扬至路边。当遇到障碍物时,清雪铲可以自动越障。文中对清雪铲进行受力分析,算出了各力的大小。以受力分析结果为基础,利用数值模拟的方法从静态、动态两个方面分别对清雪铲的强度进行分析,得到了清雪铲在静态和动态时的应力薄弱点,为进一步优化振动清雪铲提供理论依据。     

1-MCP和膜袋处理对丽江雪桃低温贮藏抗褐变效果的研究

本文将新型的乙烯受体抑制剂1-甲基环丙烯(简称1-MCP)与保鲜膜保鲜结合在低温(3±1)℃下贮藏,探讨1-MCP和膜袋处理对丽江雪桃褐变的影响,寻找有效、安全的丽江雪桃保鲜方法。以丽江市龙县拉市乡的丽江雪桃为试验材料,研究用1.5μL/L的1-MCP处理丽江雪桃后,用果蔬保鲜膜包装,放置在冷藏(3±1)℃条件下的贮藏效果。结果表明:在冷藏条件下,1-MCP处理能抑制丽江雪桃的呼吸作用,抑制细胞膜透性的升高,保持果实重量,但会增加丽江雪桃果肉POD的活性。膜袋处理可以保持水分,抑制果肉POD的活性的增强,抑制细胞膜透性升高,但抑制呼吸效果不如1-MCP处理组明显。1-MCP+膜袋处理组的丽江雪桃不仅可以保持水分,抑制细胞膜透性,抑制呼吸作用,抑制POD酶活性的增强,还可以抑制总酚含量和PPO活性的下降效,抑制丽江雪桃的果肉褐变。     

卫星雪盖制图中的一些技术问题

介绍了几种主要卫星资料用于雪盖制图的不同时、空分辫率及应用特点，阐述了雪与云的区分技术、雪盖范围的匀绘与面积估计技术，最后指出了雪盖制图技术的一些新发展。     

Optimization of Fluidized Bed Drying Process of Green Peas Using Response Surface Methodology

The fluidized bed drying process of green peas was optimized using the response surface methodology for the process variables: drying air temperature (60–100°C), tempering time (0–60 min), pretreatment, and mass per unit area (6.3–9.5 g/cm²). The green peas were pretreated by pricking, hot water blanching, or chemical blanching. Product quality parameters such as rehydration ratio, color, texture, and appearance were determined and analyzed. Second-order polynomial equations, containing all the process variables, were used to model the measured process and product qualities. Rehydration ratio was influenced mostly by pretreatment followed by tempering time, temperature, and mass per unit area. Pretreatment and mass per unit area significantly affected color and texture. Higher levels of temperature and lower levels of tempering time and mass per unit area increased the rehydration ratio. The optimum process conditions were derived by using the contour plots on the rehydration ratio and sensory scores generated by the second-order polynomials. Optimum conditions of 79.4°C drying air temperature, 35.8-min tempering time, pretreatment of the once pricked peas with chemical blanching in a solution of 2.5% NaCl and 0.1% NaHCO₃, and mass per unit area of 6.8 g/cm² were recommended for the fluidized bed drying of green peas. At these conditions the rehydration ratio was 3.49.     

Effect of mesogenic additives on the triboengineering properties of fluoroparaffins

Studies have demonstrated the effect of liquid-crystal additives on the tribological properties of fluoroparaffins serving as ski greases. It is established that the introduction of these additives into the HF80 grease reduces the friction coefficient considerably (3–7 times) when in contact with snow in temperatures below zero (?15°C) in the laboratory conditions. This is due to the drop in heat conductivity of the modified grease, because the orienting effect of the liquid-crystal molecules produces an anisotropic structure in the acquired lubricating layer. The effectiveness of the studied mesogenic modifiers depends on their molecular structure and concentration in the grease.     

石蜡雪花斑问题的分析与对策

对石蜡出现雪花斑的问题，从生产工艺过程、原料及自身特性等多方面进行了分析，明确了其主要原因在于原料本身和石蜡的成型、储存温度。通过研究，提出了解决全精炼蜡雪花斑问题的措施，即控制蜡板成型储存的条件或适量加入添加剂可以消除石蜡雪花斑。     

高职院校公体冰雪文化育人培育方略

对开展冰雪运动的高职院校而言,冰雪文化育人是体育文化育人的重要组成部分。随着这一行为的深入开展,与传统育人模式对比,在传统底蕴与现代教学诉求、冰雪文化学术价值与市场价值、学生学习习惯与高职院校氛围三方面都有着茫然与困惑。以点带面展开解决高职院校这一困惑及如何实施冰雪文化育人的六点方略：理性思考冰雪文化育人定位、树立冰雪文化育人价值理念、自觉加强冰雪文化育人积淀、凝聚冰雪文化育人组织合力、形塑冰雪文化育人行为模式、增强冰雪文化育人适应能力。