电子电器产品系统级失效分析

为了对电子电器产品的失效进行系统的失效分析,以改进电子电器产品的生产工艺,提高电子电器产品的可靠性,促进社会工业和经济的快速发展。对电子电器产品系统级失效分析方法进行了系统化总结,以提供一种适用于多种电子电器产品失效的分析方法。     

Controlling charges distribution at the surface of a single GaN nanowire by in-situ strain

Effect of the strain on the charge distribution at the surface of a GaN semiconductor nanowire (NW) has been investigated inside transmission electron microscope (TEM) by in-situ off-axis electron holography. The outer and inner surfaces of the NW bent axially under compression of two Au electrodes were differently strained, resulting in difference of their Fermi levels. Consequently, the free electrons flow from the high Fermi level to the low level until the two Fermi levels aligned in a line. The potential distributions induced by charge redistribution in the two vacuum sides of the bent NW were examined respectively, and the opposite nature of the bounded charges on the outer and inner surfaces of the bent NW was identified. The results provide experimental evidence that the charge distribution at the surfaces of a single GaN NW can be controlled by different strains created along the NW.     

诸广308铀矿床矿物学特征及铀的赋存状态研究

308铀矿床产于诸广花岗岩体中,铀矿物以沥青铀矿为主,其次为铀石。脉石矿物有微晶石英、绿泥石、水云母、萤石等;金属矿物有黄铁矿、方铅矿、闪锌矿、赤铁矿以及副矿物锆石、金红石、磷灰石等。沥青铀矿在矿石中呈斑点状、粒状、环状、脉状,矿石结构以粒状结构为主,矿石构造多为浸染状构造。铀主要以独立铀矿物形式存在,生长于矿物裂隙及边缘。     

电子设备寿命试验数据的灰色预测方法

灰色GM(1,1)模型中的背景值构造法是影响模型适应性和精度的关键因素.将所构造的背景值公式引入GM(1,1)模型,并用该模型预测电子设备寿命试验数据,目的是缩短寿命试验时间.计算结果表明,所构造的背景值公式有助于提高GM(1,1)模型的预测精度,为有效缩短电子设备寿命试验时间提供了一种值得探讨的方法.     

量子点中关联电子态的能谱

本文研究了具有不同束缚强度的两维三电子量子点中关联电子态的能谱。发现能谱由两个因素确定,即泡利原理和等边三角形配置处的内禀节面。当禁闭势非常强时,泡利原理是决定性的;当禁闭势很弱时,内禀节面起很重要的作用,从而导致魔角动量的出现。     

茶叶的电子自旋共振波谱的研究

用电子自旋共振波谱仪对茶叶中自由基和金属Mn(Ⅱ)离子进行了检测和研究,结果表明:1)干茶叶、茶渣中存在g=2.0059±0.0002,△Hpp=8～9G的自由基;2)干茶叶、茶渣、茶汤中可观察到在Ms=1/2←→-1/2跃迁的六条线,且△H_(3-4)≌96G的Mn(Ⅱ)特征波谱;3)茶叶的自由基受水、温度诸因素的影响,茶渣的自由基和金属Mn(Ⅱ)浸出量与冲泡时间、温度、冲泡用水量具有相关性。     

粉体样品制样方式对AFM图像的影响

研究不同的粉体样品制样方式对AFM图像的影响,实验证明磨具压片使松散的样品紧密而更有利于扫描,使用轻敲模式,设置点小于1V,获得清晰图片。     

鸮形目7种鸟类腹部羽毛的扫描电镜观察

在对涉案野生动物的鉴定中,羽毛常作为现场物证成为鉴定依据。为探讨鸮形目7种鸟类腹部羽毛作为鉴定依据的可行性,利用扫描电镜观察其腹部羽毛的羽小枝间距、节间距和节直径等显微结构。结果发现:草鸮科与鸱鸮科鸟类可通过羽小枝间距和节间距鉴定区分。而在物种水平上,羽小枝间距、节间距和节直径等虽然在不同物种间具有高灵敏性的差异,但其种内变异度大,作为鉴定依据还需结合更多的显微结构指标。研究结合涉案动物鉴定的实践应用需求,发现羽毛显微结构具有作为鉴定依据的应用前景。     

In-situ TEM observation of microstructural evolution in 18Cr-ODS steel induced by electron beam irradiation

The microstructural evolution behaviors of 18Cr-ODS steel under electron beam irradiation were in-situ investigated in a high resolution transmission electron microscopy (HRTEM). Fe3O4 particle was induced by electron beam irradiation through a series of dynamic procedures including lattice relaxation of the steel matrix, Cr and Ni segregations, combination of iron and oxygen atoms, epitaxial growth as well as separation of Fe3O4 grains. The size of oxides increased with increasing electron irradiation fluence, and it reached up to about 6 nm at the fluence of 6.1 1023 e/cm2.