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1906 年,L.D.Forest 在二极管中安上了第三个电极(栅极,grid)发明了具有放大作用的三极管,这是电子学早期历史中重要的里程碑。1948 年美国贝尔实验室的几位研究人员发明晶体管。1958 年集成电路的第一个样品见诸于世。集成电路的出现和应用,标志着电子技术发展到了一个新的阶段。
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Articulating his dictum “the outside is always an inside”, Le Corbusier observed that architecture inherently interacts with its environment: “the air around [a building] constitutes other surfaces, other grounds, other ceilings. […] The surroundings envelope me in their totality as a room” ...
作者简介 | 王灵晓(1998—),女,河南省南阳市,硕士研究生,主要从事功能材料方面的研究。 摘要为获得高效低阻的过滤材料,以间位芳纶为原料,采用静电纺丝的方法,通过对纺丝溶液和纺丝工艺的优化制备芳纶纳米纤维空气过滤材料,并研究纳米纤维的形貌和直径、纳...
有人天生爱挑战,有的车也是如此。1948年,第一款路虎在英国诞生,这款简单新颖的铝制工作车完美实现了实用性与稳定性的结合。到20世纪50年代中期,路虎已成为耐用性和出色越野性能的代名词。 20世纪60年代,四驱车的需求量达到空前水平,走在了这一新兴市场前端的路虎公司决心要...
As Hailey notes, “the air that wraps a building’s edges, whether or not technically a porch, carries potential: the benefits of public life, the thrills of nature, the atmosphere of weather, the exhilaration of coming and going, the calm of simply sitting down, the warmth of family and...
1637.化处理chlorination 1638.化学加药处理chemical treatment feeding 1639.锅炉水磷酸盐处理boiler water phosphate treatment 1640.全挥发性处理all volatile treatment(AVT)1641.碱性水运行工况alkaline water conditioning 1642.中性处理neutral water treatment(NWT)1643.综合处理combined water treatment(CWT)1644.预处理...