摇枕铸钢件麻坑缺陷的消除

生产中发现二氧化碳水玻璃石英砂铸钢件麻坑缺陷与二氧化碳水玻璃石灰石砂铸钢件的麻坑形貌特征相似。试验指出：采用与消除二氧化碳水玻璃石灰石砂铸钢件麻坑缺陷相同的方法如：改性涂料、不上涂料、改良面砂等工艺方法可有效地消除二氧化碳水玻璃石英砂铸钢件的麻坑缺陷。     

A note on the divergence problem arising in calculation of Green’s function for a 2D piezoelectric thin film strip containing straight line defects and free boundaries: Fourier approach for bodies of unrestricted anisotropy

In this paper we derive a set of novel formulas for computation of the Green’s function and the coupled electro-elastic fields in a 2D piezoelectric strip with free boundaries and containing a distribution of straight line defects. The strip is assumed to be of unrestricted anisotropy, but allowing piezoelectricity, and in this sense situation is more general than in the available literature where only cubic symmetry was investigated. We employ a set of already known analytic formulas for the Fourier amplitude of the Green’s function and the corresponding electro-elastic fields. The key novelty of this paper is solution for the divergence problem occurring during integration of the Fourier amplitude. This problem is caused by poles at k = 0 in various matrix components of the amplitude. From purely mathematical point of view such poles lead to quantities which do not tend to zero at infinity, and this situation is clearly unphysical. To resolve this issue it is demonstrated by means of rigorous analysis that when some additional physical conditions are imposed, physical fields exhibit regular behavior at infinity - the poles do not contribute. Nevertheless, they lead to irremovable numerical ∞ − ∞ uncertainties spreading over the whole domain of integration. This motivates us to compute exact formulas for all these poles to enable engineering calculations involving the system in question.     

超声振动辅助等离子沉积成形的研究

介绍了等离子沉积成形的原理、应用及其存在的优缺点,从超声原理出发介绍了超声振动对等离子沉积过程中晶粒及组织的影响,并设计了超声振动辅助等离子沉积成形的实验装置,对实验过程中以及该实验可能涉及的问题进行了探讨.     

基于神经网络的焊接故障诊断研究

针对焊接时容易产生气孔这个缺陷,引入了神经网络技术对气孔缺陷进行诊断,结果表明基于神经网络算法的焊接诊断稳定性好,诊断速度快,这说明该诊断技术具有很大的应用价值。     

利用红外测温诊断技术发现电流互感器内部缺陷

在电力系统中，电力设备的质量直接关系到电网的运行安全，而由于电力设备内部缺陷而引起的设备事故对电网的危害更大。应用红外测温诊断技术可以及时发现电力设备缺陷特别是内部缺陷，使设备故障得到及时的消除，避免电力系统事故的发生。     

含液晶缺陷层阶梯型双周期结构的电场方向调控特性

利用传输矩阵法研究了含向列相液晶缺陷层的一维阶梯型Double-period第四代准周期结构缺陷模的电场方向调控特性。分析了外加电场方向和正入射波方向间夹角θ与缺陷模的位置、品质因子、空间位置光场分布的变化关系,最后探讨了缺陷模的品质因子对光场强度的影响。结果表明：随着夹角θ的逐渐增大,缺陷模的位置向短波方向移动,缺陷模波长的调控量为84nm;随着夹角θ的逐渐增大,缺陷模的品质因子逐渐增大;缺陷模在空间位置的光场分布呈现出局域现象,随夹角θ的增大,空间位置的光场强度逐渐增强;缺陷模的品质因子与光场强度成正比关系。     

过量维生素A对鼠胚眼发生影响的超微结构研究

本实验选用雌性wistar大鼠14只,妊娠第8天胃管给予Vit.A 120mg/kg体重,分别于妊娠第10、11、12、13、14、17、20天剖腹取胎,进行电镜观察,结果显示在透射电镜下角膜、晶状体、视网膜的细胞膜结构不清,线粒体肿胀,次级溶酶体增多,粗面内质网(RER)扩张,核染色质边集,核周障增宽。扫描电镜发现,角膜前上皮表面微绒毛减少,视网膜层次变薄,视网膜细胞侧面突起减少。本文对上述变化进行了讨论。     

消除产品良率隐藏的杀手--电子束检查是铜逻辑和晶圆代工厂的最佳方法

监控和消除隐藏的电路缺陷已成为130nm和130nm以下器件的关键。这使得电子束检查正在广泛应用于开发、试生产和量产的监控过程。我们将描述当前铜逻辑和晶圆代工厂电子束检查技术的执行情况,其中包括详细的案例研究,它说明了从开发到量产过程中应用电子束检查技术的好处。我们也描述了过去克服通用工具障碍的方法。然后,分别介绍了利用电子束检查技术的新进展,以及为假设的20000WSPMφ300mm工厂模拟的最理想执行情况的最佳实例。     

基于一维缺陷光子晶体的角度测量仪的设计

提出用一维缺陷光子晶体来测量角度特别是小的角度变化的设计方案。用Si薄膜和SiO2薄膜组成一维缺陷光子晶体,用特征矩阵法研究该光子晶体的禁带中的缺陷模的波长和强度随入射角缓慢变化而变化的规律,由此提出根据缺陷模的波长、强度、偏振性与入射角的关系进行角度测量的原理。本设计特别适用于极小的角度变化的测量。     

Dual Additive for Simultaneous Improvement of Photovoltaic Performance and Stability of Perovskite Solar Cell

Additive engineering is one of the most efficient approaches to improve not only photovoltaic performance but also phase stability of formamidinium (FA)-based perovskite. Chlorine-based additives, such as methylammonium chloride (MACl), have been in general used to improve phase stability of FAPbI₃, which however often leads to loss of open-circuit voltage V_oc, accompanied by instability of the perovskite phase due to the volatile nature of the MA cation. A dual additive strategy for improving V_oc and thereby the overall efficiency are reported here. The mixing ratio of MACl to CsCl is varied from [MACl]/[CsCl] = 4 to 1, where V_oc increases with decreasing the ratio and best performance is achieved from [MACl]/[CsCl] = 2. As compared to the single source of MACl, the addition of CsCl reduces trap density and increases resistance against charge recombination, which is responsible for the increased V_oc. Moreover, defect passivation achieved by dual additive enables better stability than the single additive MACl as confirmed by long-term stability tests with unencapsulated devices for 50 days under relative humidity of about 40% at room temperature. The best power conversion efficiency of 23.22% is achieved by dual additive, which is higher than that for single additive of MACl or CsCl.