蒙古族传统家具——承具

游牧生活状态下蒙古族传统家具中的承具使用频次虽不及庋具高,但与庋具同等重要。文中的承具主要指桌、案、架台等支承、承放类家具。桌类家具有供奉、用餐、喝茶及书写等功能;案类主要有供奉作用;架台主要用于承托箱、橱等家具或器物。

异极式永磁偏置径向磁轴承的建模与实验

为了满足储能飞轮系统、卫星动量轮等对高空间利用率的需求,提出了一种异极式永磁偏置径向磁轴承的拓扑结构。通过在槽口放置平行充磁的永磁体获得紧凑的结构,同时永磁磁路和电励磁磁路耦合距离较短,有利于获取高解耦特性。该文首先采用磁力线法,分别获取考虑齿槽效应、转子偏心的永磁磁场、电励磁磁场的气隙磁通密度分布,建立了磁路模型;然后根据磁路模型求解位移刚度和电流刚度,建立磁轴承的数学模型;与有限元仿真进行对比,证明所建立的磁场模型能够准确计算气隙磁通密度分布。设计、制造一台实验样机并进行相关实验,实验结果验证了磁路模型及有限元仿真的可靠性。

从镇江本《杏园雅集图》初探明代早期家具

坐具与承具的结合使用。李时勉坐于一罗汉床,周述、陈循各坐于一玫瑰椅上,其三人虽然坐于不同的坐具,但都面对着同一画桌,三人身姿不同但都看向桌面,显然是坐具(罗汉床、玫瑰椅)与承具(画桌)的结合使用。明代早期家具中的坐具通常与脚踏配套使用。第一部分中李时勉所坐的罗汉床,周述、陈循所坐的玫瑰椅都设有脚踏,且从造型与材质都可以看出,脚踏与其坐具实为一套。家具种类多样化与不同材质的结合使用。杏园雅集活动在杨荣的杏园举办,其画中描绘皆为杏园中家具,家具种类便有罗汉床及其脚踏、玫瑰椅及其脚踏、画桌、棋桌、香几、坐墩、方桌、屏风等等。而家具的材质也不尽相同。

Mathematical Modelling of Cutting Force as the Most Reliable Information Bearer on Cutting Tools Wearing Phenomenon

Being one of their prominent exploitative characteristics, cutting tools durability depends on the character, intensity and the speed of wearing. Identification of tool wearing is of great significance for the purpose of avoiding sooner or later replacement of tools. The parameters of tool wearing can be measured by out-process and in-process-measuring systems. Given the extremely limiting role of the former in modern production lines, development of the latter （the indirect measuring systems） has gained prominence, The basis of indirect measuring systems comprises a set of various signals originating from the units of the system under treatment which stand in certain correlations with the wearing parameters. The paper presents mathematical models of axial force designed on the basis of experimental research in drilling tempered steel by twist drills made of high-speed steel manufactured by powder metallurgy.