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Augmenting the Heat Sink for Better Heat Dissipation
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作者 Mohammed H. S. Al Ashry 《Circuits and Systems》 2015年第2期21-29,共9页
Heat sinks were invented to absorb heat from an electronic circuit conduct, and then to dissipate or radiate this heat to the surrounding supposedly, ventilated space, at a rate equal to or faster than that of its bui... Heat sinks were invented to absorb heat from an electronic circuit conduct, and then to dissipate or radiate this heat to the surrounding supposedly, ventilated space, at a rate equal to or faster than that of its buildup. Ventilation was not initially recognized as an essential factor to thermal dispersion. However, as electronic circuit-boards continued to heat up, circuit failure became a problem, forcing the inclusion of miniaturized high speed fans. Later, heat sinks with fins and quiet fans were incorporated in most manufactured circuits. Now heat sinks come in the form of a fan with fans made to function as fins to disperse heat. Heat sinks absorb and radiate excess heat from circuit-boards in order to prolong the circuit’s life span. The higher the thermal conductivity of the material used the more efficient and effective the heat sink is. This paper is an attempt to theoretically design a heat sink with a temperature gradient lower than that of the circuit board’s excess heat. 展开更多
关键词 CONVECTIVE HEAT Transfer: HEAT Absorbed by the Natural AIR Flow Surrounding Hot Objects FORCED CONVECTIVE HEAT Transfer: Absorption of HEAT Using FORCED AIR Flow Conductivity: Is the Ability of a System to Exchange or TRANSFER Temperature within a Body or MATERIAL through the Movement of Electrons MATERIAL That Does Not Conduct HEAT Is Considered a nonconductor
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在不连续Pd粒子覆盖的非导体表面电沉积铜的研究 被引量:1
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作者 王桂香 李宁 黎德育 《材料保护》 CAS CSCD 北大核心 2006年第10期12-15,共4页
考察了在覆盖有分散Pd粒子的非导体表面电沉积铜的初始阶段,发现非导体在电沉积前的面电阻达到100MΩ/cm时可实现较快速度的电沉积。铜层生长前沿分为厚镀层区和薄镀层区两部分,厚镀层区外观为红色,形成致密的结晶;薄镀层区颜色发黑,小... 考察了在覆盖有分散Pd粒子的非导体表面电沉积铜的初始阶段,发现非导体在电沉积前的面电阻达到100MΩ/cm时可实现较快速度的电沉积。铜层生长前沿分为厚镀层区和薄镀层区两部分,厚镀层区外观为红色,形成致密的结晶;薄镀层区颜色发黑,小的铜晶粒在高能表面首先生成。离挂具点近的地方结晶致密,反之则结晶稀疏。SEM照片显示出最初沉积的铜层是以Pd为沉积点的不规则块状,其大小为2~5μm2,随后在众多连续状上有晶体缺陷的高能表面沉积出具有立方形状的铜晶体。电沉积铜过程的推动力是生长前沿高达106A/dm2的电流密度,先沉积的铜层起到挂具的作用直到非金属表面被完全覆盖。 展开更多
关键词 电沉积铜 非导体 不连续Pd粒子 镀层形貌
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圆形区域变化磁场激发涡旋电场的问题剖析及案例分析 被引量:3
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作者 黄绍书 王金霞 《物理通报》 2017年第12期107-110,共4页
剖析涡旋电场的分布以及涡旋电场中非导体约束和导体约束条件下的电势问题,给出在限定的圆形区域内均匀变化磁场中的涡旋电场、感生电动势与电势的分布规律,以及在这限定的圆形区域内均匀变化的磁场中,非导体约束和导体约束条件下电势... 剖析涡旋电场的分布以及涡旋电场中非导体约束和导体约束条件下的电势问题,给出在限定的圆形区域内均匀变化磁场中的涡旋电场、感生电动势与电势的分布规律,以及在这限定的圆形区域内均匀变化的磁场中,非导体约束和导体约束条件下电势的计算与比较.通过在涡旋电场中对电源、电势及电压等概念的引入,澄清了一些在大学物理教学中涉及涡旋电场的容易模糊、难于理解的概念.对涡旋电场的一个具体案例进行了详细分析. 展开更多
关键词 感生电动势 涡旋电场 非导体约束 导体约束 案例分析
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