Daily Archives: 2015 年 10 月 21 日

A Mirage of a Floating City in the Sky

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Have everyone ever saw a mirage in you real life? I saw it when I was little, it was beatiful and fantasy which i can’t realized it is not real at the first time. And for me it was a wonderful memory. But I think maybe there are a lot of people never saw mirage before. Then you will happy to know that IFLScience brings us word that thousands of people in China this week reported seeing a large “floating city” in the sky that actually turned out to be a Fata Morgana, which is a rare type of mirage. Now i will share a little information about mirage.Mirages are real phenomena of atmosp... ...Read More>>

洛氏硬度检测方法-摘自《金属硬度检测方法》

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洛氏硬度检测原理： 洛氏硬度检测法采用120°金刚石圆锥或淬火钢球（规定直径的）作为压头，在初始检测力F0作用下，再加上主检测力F1，在总检测力F作用下，将压头压入试样表面。之后卸除主检测力，在保留初始检测力F0测量压痕深度残余增量e，100（或130）减去e值（e值以0.002mm为单位）即洛氏硬度值。 符号说明： 硬质合金硬度检测方法及步骤 1、采用HRA标尺 2、试样厚度不小于1.6mm，表面粗糙度Ra≤2um，对烧结状态试样表面磨去厚度不小于0.2mm。如... ...Read More>>

厦门中钨在线每周知识回顾-第38周-碳足迹

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大家好~最近天气转凉哦~~记得注意保暖啦~~今天要跟大家一起回顾的是关于碳足迹的小知识，希望对大家有帮助。 Carbon Footprint，标示一个人或者团体的“碳耗用量”。“碳”，就是石油、煤炭、木材等由碳元素构成的自然资源。“碳”耗用得越多，导致地球暖化的元凶“二氧化碳”也制造得越多，“碳足迹”就越大；反之，“碳足迹”就越小。 A carbon footprint is historically defined as”the total set ofgreenhouse gas(GHG) emissions caused by an organization, event, product or... ...Read More>>