共查询到19条相似文献,搜索用时 62 毫秒
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纳米微粒由于其独特的物理、化学性能而受到世界范围的广泛关注。使用金属、合金、半导体和陶瓷纳米微粒来制备功能材料,如陶瓷超塑性材料,一直是科学家们研究的焦点。为了了解这些纳米微粒不同寻常的特性,开发将这些纳米微粒制成块体功能材料的方法,必须对纳米微粒的接合行为进行研究。用电子束照射的方法在HRTEM中动态观察A1/A1纳米微粒的接合过程作者已有报道[1~3],本文研究了金纳米微粒的迁移、旋转和接合,并对其接合机理进行分析讨论。具有直径为1~6纳米的金纳米微粒是由氩离子束溅射技术制备的[3]。金纳米微粒放置在厚度大约为20… 相似文献
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以大白鼠60只作为实验材料,用重庆光学机械研究所制造的JGD-1He-Ne激光器(功率为5mw)照射两侧足三里。照射前后用YL-3型氯化银环形电极测痛,以测定痛阈的变化。为了解激光照射次数与镇痛的关系,以10只动物进行一天,二天、三天照射,每次照射后测痛,观察其变化情况。为了了解激光照射后的后效应将动物作一小时、 相似文献
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为了研究4H-SiC晶体在强激光辐照下电子特性及其变化,采用基于密度泛函微扰理论的第一性原理赝势的方法,对纤锌矿4H-SiC晶体在强激光照射下的电子特性的变化进行了理论分析和实验验证。结果表明,电子温度Te在0eV~2.75eV范围内时,4H-SiC仍然是间接带隙的半导体晶体;当电子温度Te升高达到并超过3.0eV以上时,4H-SiC变为直接带隙的半导体晶体;电子温度Te在0eV~2.0eV变化时,带隙值随电子温度升高而增大;电子温度Te在2.0eV~3.5eV变化时,带隙值随电子温度Te的升高而迅速地减小;当电子温度Te高于3.5eV以后,带隙已经消失而呈现出金属特性。该研究对制作4H-SiC晶体特殊功能电子元件是有帮助的。 相似文献
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利用激光熔覆制备WC增强涂层,通过光学显微镜(OM)、电子扫描显微镜(SEM)和EDS对试样观察和分析,并依据颗粒相分布均匀性,获得推荐优化工艺参数是送粉量为7.8g/min、扫描速度为4mm/s、激光功率为2.0kW和离焦量为50mm。在此基础上,应用M-200摩擦磨损试验机考察了WC/Ni60涂层在40% NaOH强碱溶液作用下的摩擦磨损行为,结果表明,涂层的摩擦磨损机制随工况的变化而变化,钝化膜的生成和溶解成为一个动态过程,且所制备的涂层在中速中载时较干摩擦能够显著降低摩擦因数和磨损量。 相似文献
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本文主要介绍GVL-I型金蒸气激光放电管的设计中最佳长度/直径比和电极、保温材料的选择等,对放电管管壁温度、频率、气体压力、输入功率与激光输出功率的关系也进行了讨论。 相似文献
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A MoOx(top)/Au/MoOx(bottom) multilayer was systematically designed for transparent electrodes in green OLEDs in terms of optical transmission and series resistance of the device. The enhancement in optical transmission of MoOx/Au/MoOx (MAM) structures is a result of a series of events, including the optical interference within the multilayers and the interaction of light with surface plasmon polaritons in the metal layer. For the maximum transmission, the optical interference occurring within the multilayers was simulated using a transfer matrix model to determine the optimum thickness of MoOx layers, and then the thickness of the Au interlayer was experimentally optimized for extraordinary optical transmission. In addition, the series resistance added by the top MoOx was characterized to confirm its negligible impact on the performance of the device. The optimum MoOx (40 nm)/Au (10 nm)/MoOx (40 nm) structure showed much higher transmission in the green-red region and lower sheet resistance than indium tin oxide (ITO). We have fabricated MAM-based OLEDs the driving voltage of which was significantly reduced to ∼5.5 V at a current density of 20 mA/cm2, and the current efficiency (11.46 Cd/A) was higher than that (10.91 Cd/A) of ITO-based OLEDs, demonstrating that the MAM electrode is a potential replacement for ITO in optical devices. 相似文献
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Hao Lin Deyao Li Liqun Zhang Pengyan Wen Shuming Zhang Jianping Liu Hui Yang 《半导体学报》2020,41(10):102104-102104-4
Au80Sn20 alloy is a widely used solder for laser diode packaging. In this paper, the thermal resistance of GaN-based blue laser diodes packaged in TO56 cans were measured by the forward voltage method. The microstructures of Au80Sn20 solder were then investigated to understand the reason for the difference in thermal resistance. It was found that the microstructure with a higher content of Au-rich phase in the center of the solder and a lower content of (Au,Ni)Sn phase at the interface of the solder/heat sink resulted in lower thermal resistance. This is attributed to the lower thermal resistance of Au-rich phase and higher thermal resistance of (Au,Ni)Sn phase. 相似文献
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根据生物组织的电生理特性 ,建立He-Ne激光与生物组织相互作用时信息传递的物理模型 ,再根据电路和电磁学的有关理论 ,探讨He -Ne激光与生物组织相互作用的信息传递规律 ,从而阐明了激光作用于生物组织时信息传递的机制 相似文献
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样品为P型的Si(111)片上真空充氩溅射了铂膜,厚度分别为540,700和1000A(用~(244)Pu同位素x光萤光法测量)。用连续的Nd:YAG激光扫描,速率恒定在14.3(mm·sec~(-1))时,功率分别为0.3,2.1,3.9,5.7和7.8W;当激光功率恒定在3W时,扫描速率分别为9.3,11.5,14.3,16.9和21.9(mm·sec~(-1))。激光辐照后,^样品的卢瑟福背散射谱(RBS)表明了界面上铂硅化物的生成,铂含量在0.19至1.05之间变化;而x-射线衍射分析(XRD)表明了界面上P_(+3)Si,P_(+12)Si_(5)和P_(+2)Si混合相的存在。 相似文献