西北漢簡“柱馬”再探

西北漢簡中的“柱”多通“住”“駐”,有“停駐”“駐扎”之意,常見“爲……柱”的結構,强調柱馬服務的對象。“柱馬”是對某地停駐的其他機構公務用馬的統稱,以區别於該機構的自有馬匹;某地經停的其他機構的車輛也可以被稱作“柱車”。西北漢簡中的“柱馬”除了有迎來送往的駕車傳馬外,還有下級吏員騎乘迹候的候馬、傳遞信息的驛馬等。柱馬應受郡太守府一級的統籌和調度,其所停駐機構爲柱馬提供飼料,并移文告知柱馬原屬機構按律令於次月入賬,再以書面形式回報。

地铁车辆基地停车列检柱式检查坑钢柱施工工艺

乌鲁木齐市轨道交通2号线一期工程哈马山车辆基地作为地铁2号线的车辆基地,其主要作用是用作地铁2号线地铁车辆检查、维修停工场地,保证日常运行地铁的安全,是地铁运营中必不可少的环节。车辆基地运用库作为地铁检修的主要工作区域,共设置16道柱式检查坑,检查坑采用Q235B型钢加工成型。传统柱式检坑为混凝土现浇结构,钢柱为采用型钢加工,通常为钢柱与配套预埋件组成。钢柱可实现工厂化生产,能加快施工工期,相比传统混凝土现浇结构,钢柱美观、大方。通过乌鲁木齐市地铁2号线一期工程哈马山车辆基地运用库停车列检柱式检查坑钢立柱的施工,对钢立柱施工过程中的关键施工工艺进行总结及探究,也为其他采用柱式检查坑钢立柱的施工项目提供借鉴经验。

双桅柱式垂直升降高空作业车的结构特点

介绍了一种适于城市住宅小区、厂矿。

西北汉简中“柱马”与“柱”新考

“柱马”一词在西北汉简中多次出现,学界对其意义争议颇大,主要有备用马、正马或主马、专用马、驮马、驻马五种观点。对于“柱”,有通“住”、通“驻”两种说法。在全面梳理简牍中“柱马”和“柱”的基础上,并结合传世文献,文章认为“柱”通“驻”,是停留、逗留义。“柱马”就是“驻马”,是传马的一种,是因接送客人等任务而逗留、停留在某地的马匹。传马自接到任务起就称为柱马,直到完成任务回到本地止。在接到任务等待客人的阶段,“柱马”似为“备用马”,但就整体阶段来说,这种说法是不准确的。后世有“驻马”,是动宾结构,与汉简中偏正结构的名词“柱马”不同。

Fluid Flow Past a Circular Cylinder with Tandem Rod and Staggered Rod at Low Reynolds Number

The flow past a primary cylinder with one tandem control rod and one staggered control rod is simulated in this paper through solving the Navier-Stokes equations. Two examples are simulated to validate the model, and the results matched well with those of previous researches. The Reynolds number based on the diameter of the primary cylinder is 500. The diameter ratio between the control rod and the primary cylinder （d/D） is 0.25. It was found that the effect of the combination of one upstream tandem control rod and one staggered control rod on the hydrodynamics of the primary cylinder is a linear superposition of the effect of a corresponding single control rod, and the effect of the upstream tandem control rod is dominant at larger spacing ratios such as G/D=2. For the combination of a downstream tandem control rod and a staggered control rod, the effect of the control rods is different from that of the corresponding single control rod in the region of 0.2〈G/D〈0.5 ＆ 30°〈a〈120° and 0.9〈G/D〈1.4 ＆ 30°〈a〈50°, where the additional effect is obvious. In this case, the effect of the downstream tandem control rod is dominant at small spacing ratios （such as G/D=0.1）. At moderate spacing ratios such as G/D=0.4, the effects of the tandem control rod and the staggered control rod are comparable in both cases.

Crashworthiness design and experimental validation of a novel collision post structure for subway cab cars

This paper proposes a novel collision post structure designed to improve the crashworthiness of subway cab cars.The structure provides two innovative features:1)a simpler connection between the post and the car roof,which gives a more reasonable load transfer path to reduce the stress concentration at the joint;and 2)a stiffness induction design that provides an ideal deformation model to protect the safe space of the cab cars.The novel collision post structure was evaluated with finite element analysis,and a prototype cab car was mechanically tested.The results demonstrate that the deformation response was stable and agreed well with the expected ideal mode.The maximum load was 874.17 kN and the responses remained well above the elastic design load of 334 kN as required by the design specification.In addition,there was no significant tearing failure during the whole test process.Therefore,the novel collision post structure proposed has met the requirements specified in new standard to improve the crashworthiness of subway cab cars.Finally,the energy absorption efficiency and light weight design highlights were also summarized and discussed.

“让长方体躺下”的教学启示

在教学＂圆柱的体积＂一课时,我出示了这样一道拓展题：＂广场的一侧设有圆柱形挡车柱,挡车柱的侧面积是25.12平方分米,底面半径是1分米,这个挡车柱的体积是多少立方分米？＂多数学生解答时先求出圆柱的高,再利用圆柱体积公式求出圆柱的体积：25.12÷（2×3.14×1）=4（分米）;