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用改进了的射频溅射仪,在GaAs/GaAlAs DH面发光管的窗口上沉积一层厚度近于/4的Al2O3抗反射层后,其输出光功率增高了3066%。而在相同涂层条件下,退化发光管输出光功率的提高则不到30%,这可能与其体内形成缺陷有关。 相似文献
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阐述了TLMEL900型提梁机悬挂液压系统的工作原理。针对调试时悬挂下降过程中存在的振动和噪声问题,做了理论分析和仿真研究。提出了应用外泄式液控单向阀的悬挂液压原理,并进行了仿真分析和试验研究。结果表明,改进后的悬挂系统下降过程平稳,且再无振动和噪声问题,取得了良好的效果。 相似文献
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A modified conventional RF sputtering equipment is used in preparing the Al_2O_3 antireflection(AR)coating.An increase in the light output by 30—60% at a driving current of 200 mA for theGaAs-GaAlAs DH LEDs coated on the front faces with a AR coating thickness of about λ/4 hasbeen obtained.Under the same AR coating conditions a light output increase of less than 30% forthe degraded LEDs of the same type has been determined.It may probably be attributed to thedefects formed in the bulk of the Ga_(1-x)Al_xAs crystals caused by degradation of diodes which re-stricts light output increase. 相似文献
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The study on the diffusion of Cd and Zn in InP at a temperature range of 450—700℃ andtheir compared results are described in this paper.The effects of various impurity sources,such asCd and Zn as well as their compounds on the results of diffusion are investigated intensively.UsingX_j~2/t ratio defined by the square of the diffusion depth X_j~2 and time t as a measure of the diffusionvelocity,we show the plots of X_j~2/t vs temperature T.It is found that the diffusion velocity of Cd,especially CdP_2 diffusion sources is slower and thus easier to control the diffusion depth andconcentration.However they are more ideal diffusion impurity sources.We explain the complicationphenomena of Cd-and Zn-diffusion in InP with neutral complex presented by Tien(1979). 相似文献
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本文介绍了在450700℃的广阔温度范围内研究Cd和Zn向InP扩散的结果,并对结果作了比较。详细研究了Cd,Zn及其化合物等不同杂质源对扩散的影响。我们用结深(xj)的平方和时间(t)的比值(xj2/t)作为扩散速度的度量,并画出了xj2/t-1/T(温度)曲线。发现Cd源,特别是CdP2源的扩散速度较慢,容易控制它扩散的结深和浓度,昕以它是比较理想的扩散杂质源。利用Tien的中性复合体理论,解释了Cd和Zn在InP中扩散的复杂现象。 相似文献
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基于ADAMS和ANSYS的桥梁检测车臂架结构的研究 总被引:1,自引:0,他引:1
研究运用ADAMS和ANSYS联合分析方法对桥梁检测车臂架进行机构运动和强度分析.首先利用AD—AMS进行动力学分析,获取各结构件的动力学参数随时间变化的曲线,特别是各结构件在铰接处的受力信息.然后把ADAMS仿真获得的铰接处载荷信息作为各结构件有限元分析的边界条件,对结构件进行强度分析.仿真结果验证了初始设计的可行性,确立了在物理样机设计中的关键设计参数,为进一步的优化设计和轻量化设计提供了依据. 相似文献
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