俄歇电子像的蒙特卡罗模拟

Simulation of Auger electron image contrast formation is helpful for analyzing the images in scanning Auger microscopy/microanalysis(SAM),which provides elemental and chemical composition of surface and,thus,applies to the material evaluation and identification for many kinds of materials.     

低能电子光刻的蒙特卡罗模拟

Electron beam lithography(EBL)has been playing an important role in the fabrication of large-scale integrated semiconductor devices because of its high resolution.Although high-energy electrons are widely employed in the present EBL system,high-energy electrons can penetrate through the resist layer,lose most of their energies in the substrate and,thus,cause damage to the underlying substrate.     

电子束光刻中邻近效应的Monte Carlo模拟

电子束光刻不受衍射效应的限制，具有高分辨率和能产生特征尺寸在100nm以下图形的优点。目前，国际上正在将角度限制散射的投影电子束光刻技术作为21世纪100纳米以下器件大规模生产的主流光刻技术进行重点开发。     

出射二次电子表面分布的多重分形谱

本文用ＭｏｎｔｅＣａｒｌｏ方法模拟了１－１０ｋｅＶ的入射电子与固体Ｓｉ的相互作用，在模拟中还对体内的二次电子进行跟踪。对出射二次电子在样品表面的分布进行了多重分形研究。随入射电子能量增大，多重分形谱高度下降，多重分形谱主要向低奇异指数方向扩展。     

Pressure and temperature dependent up-conversion properties of Yb~(3+)-Er~(3+) co-doped BaBi_4Ti_4O_(15) ferroelectric ceramics

Yb3+ and Er3+ co-doped BaBi4Ti4O15(BBT) ceramic samples showed brighter up-conversion photoluminescence(UC-PL) under excitation of 980 nm. The monotonous increase of fluorescence intensity ratio(FIR) from 525 to 550 nm with temperature showed that this material could be used for temperature sensing with the maximum sensitivity to be 0.0046 K–1 and the energy difference was 700 cm–1. Moreover, the sudden change of red and green emissions around 400 oC might imply a phase transition. With increasing pressure up to 4 GPa, the PL intensity decreased but was still strong enough. These results illustrated the wide applications of BBT in high temperature and high pressure conditions.     

电子轨迹的分形描述

电子轨迹的分形描述李华，丁泽军，吴自勤（中国科学技术大学基础物理中心，合肥２３００２６）电子在固体中的运动轨迹具有分形的特性。本文用ＭｏｎｔｅＣａｒｌｏ方法模拟了１－１０ｋｅＶ能量的不同数目的电子入射到固体Ｓｉ、Ｃｕ、Ａｇ、Ａｕ中的运动轨迹。由盒计数...     

ACS-Ⅱ型破乳剂自动控制系统在炼油厂的应用

通过ACS-Ⅱ型破乳剂自动控制系统在炼油厂原油电脱盐装置上的应用，使药剂以原剂形式注入，工艺得到简化，工人劳动强度降低，操作方便、直观、精度高。同时使设备小型化，减少了设备占地面积，节约了电能及药剂量。     

金属掺杂PVC靶材在两种激光辐照下的激光推进实验研究

为了研究各类工质在不同激光器作用下的性质,采用TEA-CO2以及YAG激光器,对纯PVC靶材以及纳米/微米金属颗粒掺杂的PVC复合靶材进行了烧蚀测试,发现各种靶材在两种激光照射下的性能相差各异。在YAG激光照射下,各种靶材测试的冲量耦合系数均大于在TEA-CO2激光照射下的测量值,而比冲则正好相反;使用TEA-CO2激光器下的推进效率略高于YAG激光器。通过对烧蚀率的测试,确认了各种材料在不同激光下的烧蚀深度不同,而掺入金属后的靶材可以有效地减小烧蚀深度。     

Upconversion luminescence ofNaYF4：Yb,Er nanocrystals with high uniformity

The NaYF4：Yb,Er nanocrystals were synthesized via the thermal decomposition ot metal oleate precursors, lhe nanocrys- tals in hexagonal structure were highly uniform and in size of 25 nm. The bright upconversion luminescence was observed under the excitation of 980 nm laser and the upeonversion emission spectra were investigated at different pump powers. The emission intensity ratio of red light to green light linearly increased with pump power increasing. This result indicated that there existed a large threshold power of saturation pump for the first excitation state in NaYFa：Yb,Er nanocrystals comparing to that in bulk material.     

粗糙薄膜表面的原子力显微镜研究和多重分形分析

用一系列生成元模拟了具有不同特征的、与原子力显微镜图像相似的规则粗糙表面。详细讨论了规则粗糙表面多重分形谱参数的意义。并通过与方均根粗糙度（rms）和简单分形维数D0的比较，描述了多重分形分析的优点。最后用多重分形的方法分析了由AFM测量的ZnO薄膜和高聚物PtBuA薄膜的表面形貌。