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公路圆曲线测设常用方法局限性的处理 被引量:3
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作者 张健 张鑫 +5 位作者 高金贵 梁超 刘瑞军 姜兆芳 王永成 于胜武 《北华大学学报(自然科学版)》 CAS 2012年第6期714-716,共3页
针对因障碍物导致的视线不通对切线支距法在公路圆曲线测设中的影响,应用数学方法建立了一种新算法.实例应用结果表明:该算法能够有效地解决切线支距法应用中的局限性问题.
关键词 公路圆曲线 局限性 测设精确度 障碍物
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An experiment discovery about gravitational force changes in materials due to temperature variation 被引量:1
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作者 Fan Liangzao Feng Jinsong Liu Wuqing 《Engineering Sciences》 EI 2010年第2期9-11,共3页
The authors discovered in first time that the weight of materials or its gravitational force by earth related to its temperature and its ferromagnetism. An experiment was designed to elevate the temperatures of six di... The authors discovered in first time that the weight of materials or its gravitational force by earth related to its temperature and its ferromagnetism. An experiment was designed to elevate the temperatures of six different materials (Au, Ag, Cu, Fe, Al, Ni) up to 600 ℃and precisely measured their weights. It is found all the materials weigh about 0.33 ‰ - 0. 82 ‰ less. For example the weight of silver sample weighted by a precision electronic scale in a manner of special design decreases about 0.8 ‰, when its temperature is elevated to 600 ℃. Thus different metals' gravitational forces or weights are adjusted with temperature variation. 展开更多
关键词 metal gravitational force internal energy of mass ferromagnetic materials NDFEB
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