汽车ABS电机PWM控制方法研究

通过对ABS工作过程中制动液流量的分析,确定了ABS电机的基本工作要求.结合ABS电机的工作特性,采用基于逻辑门限值的PWM控制方法控制电机.运用DSpace搭建快速原型试验台,对比在不同电机工作转速、PWM控制频率下的噪声和制动踏板感觉,优化逻辑门限值大小,得出合理的工作方式,使电机既能满足控制要求,又有较长的寿命.通过在不同路面的试验结果对该控制方法的两个关键参数进行了优化.最后进行不同工况的试验,结果表明:通过优化控制参数的PWM控制方法,具有较强的鲁棒性,能够满足ABS在任何工作条件下对电机的要求.     

已交配雌性克氏原螯虾的择偶行为

动物在繁殖期间会随自身繁殖状态的变化而调整择偶行为,这会导致它们择偶的多样性.本文研究具交配经验的雌性克氏原螯虾(Procambarus clarkii)在Y型水迷宫中对不同婚配状态的潜在配偶的择偶行为.雌虾对空白与原配、童子、非童子3种信息源虾的访问总时间P值均小于0.05,结果表明雌性克氏原螯虾与原交配雄体有再次交配的显著倾向,对该现象本文从螯虾繁殖成功率方面进行了探讨;面对3种信息源虾的选择差异性的P值均大于0.05,表明雌虾不区分潜在配偶的婚配状态,本文就螯虾的择偶偏好进行了讨论,此外对螯虾定向配种方面的应用进行了初步探讨.本研究以期为克氏原螯虾的繁殖行为学的理论研究及生产实践积累具参考意义的基础数据.     

Mineralization of flue gas CO2 with coproduction of valuable magnesium carbonate by means of magnesium chloride

CO2 mineralization and utilization is a new area for reducing the CO2 emissions. By reacting with natural mineral or industrial waste, CO2 can be transformed into valuable solid carbonate （such as calcium carbonate or magnesium carbonate） with recovery of some products simultaneously. In this paper, a novel method was proposed to mineralize CO2 by means of magnesium chloride with small energy consumption. In this method, magnesium chloride was firstly transformed into magnesium hydroxide by electrolysis. The formed magnesium hydroxide showed high reactivity to mineralize CO2. In our study, even at low concentration, CO2 can be effectively mineralized by this method, which makes it possible to directly mineralize flue gas CO2, avoiding the expensive process of CO2 capture and purification. Moreover, valuable products such as hydromagnesite and nesquehonite can be recovered by this method. Because of the wide distribution of magnesium chloride in nature, largescale CO2 mineralization is potential by means of magnesium chloride.     

关于农业物联网发展的思考

我国农业的发展现状亟须通过发展农业物联网技术来提高生产效率和节约资源。加快实施农业物联网建设,实现农业物联网生产、服务、存储、销售一体化,可以从大规模生产系统、精细化生产平台、销售电商平台和农产品深加工等四个方面着手。     

复合材料涂层耐磨性的试验

介绍了自行研制的复合材料涂层,并在实验室进行了耐磨性对比试验。试验表明,涂层的平均耐磨性至少是４５号调质钢的３倍。     

山地麻蜥冬眠期脂肪体和肝糖含量变化的研究

对山地麻蜥冬眠前后的体重、肝重、肝糖浓度、脂肪体重等指标的检测,表明山地麻蜥冬眠前后的肝重、肝糖浓度、脂肪体重均发生明显变化,提示山地麻蜥冬眠期间肝糖和脂肪体的消耗量大;统计数据还显示肝糖浓度与体重、肝重之间的相关性不显著．     

13-Bit多速正六边形格子气自动机模型

建立了具完全对称性的多速正六边形格子气自动机模型,通过对典型绕流问题的计算模拟,证明了模型的正确性和有效性。     

一种测试冶金熔体流变特性的方法

提出了采用可改变转速的高温粘度计,测试冶金熔体中熔渣和熔盐流变特性的方法,这种高温粘度计只对较为普启遍采用的高温粘度计进行少量的改进,提出利用这种高温粘度剂确定所测熔体的流变参数的方法,并给出修正后的本构方程。     

国产轿车用冷轧钢板冲压级别评定

讨论了ＧＢ５２１３－８５在钢板冲压级别评定指标方面的问题,并对钢板的基本成形性和模拟成形的相关性进行了分析,在轿车冲压件成形分类的基础上,提出了新的冲压级别评定方法。     

Sulfide-melt inclusions in mantle xenoliths of Hannuoba, China

Sulfide fluid incluision study on mantle xenoliths of Hannouba has been carried out by EPMA analysis. It is indicated that the Ni/Fe ratios of metal sulfides in sulfide-melt inclusions from Hannuoba seem to be related to host rocks. These data of lherzolite (pentlandite) are obviously higher than those of olivine pyroxenite (mainly pentlandite, partly pyrrhotine). The LRM analysis shows that sulfur (H₂S + SO₂) occupies larger proportion in gas composition of CO₂ fluid inclusions, generally more than mol 20%. This may be related to sulfide inclusions which are frequently found.