兴化市乌巾荡湖相沉积层中鉴别洪水沉积标志的研究

选择兴化市乌巾荡，在湖滨采集地表２０ｃｍ至２８０ｃｍ的晚全新世沉积层连续样品，经物理鉴定后，又进行粘土，粘土矿物Ｘ衍射，磁化率，硼含量，部分岩芯磨片镜下观测等多元测试分析，提出了乌巾荡湖相沉积层中鉴别洪水沉积的标志与初步结论。     

基于刹车印迹的典型碰撞事故再现分析

刹车印迹是事故现场勘测与责任分析的主要研究对象，传统的事故现场勘测以手工测量为主，本文讨论了利用摄影测量理论进行事故现场数字化测量的方法，使用该方法，将减少占道时间，快速恢复事故现场的交通．本文以一起典型碰撞事故为例，利用摄影测量理论对事故发生环境及刹车印迹进行计算机三维重建，得到刹车印迹长度与相对角度的精确数值．同时根据刹车印迹信息，利用动力学理论及优化计算方法进行事故发生时刻及刹车前车速求解．最后本文对轨迹法在事故再现研究中的适用范围进行了探讨．     

渐进式工序图绘制研究

工序图绘制是企业工艺设计过程中最复杂和任务量最大的工作,文章在分析企业工艺设计过程特点的基础上,提出了渐进式工序图绘制的基本思想和方法,包括基于形状特征工序图形渐进绘制,工序尺寸公差、工艺符号等的标注。这种方法,由于每次只涉及局部的图形修改,不需要对每道工序图都从零开始绘制,因此,较之其他方法具有很高效率     

VC＋＋制作可拖动的标记图形

在VC＋＋的许多应用（尤其是图形应用）中,需要在屏幕上设置一些标记。本文着重介绍如何用鼠标来拖动这些标记图形,方法是通过对鼠标的跟踪来完成。本文以三个红色实心小圆为例,给出了可用鼠标拖动的图标的制作方法。     

食品学科本科毕业论文(设计)模式的经验和探索

对食品学科本科毕业论文(设计)过程中的选题、学生查阅英文文献能力的提高、实验过程中问题的解决、数据造假行为及抄袭剽窃行为的杜绝、论文格式的规范、学生应变能力及语言表达能力的提高、成绩评定标准的建立等方面进行了探讨.     

Crystallographically-dependent ripple formation on Sn surface irradiated with focused ion beam

The metallographically polished polycrystalline Sn surface was sputtered by 30 kV focused Ga⁺ ions at room temperature. The experiment was carried out using various FIB incidence angles (0°, 15°, 30°, and 45°) over a wide range of doses (10¹⁶–10¹⁸ ions/cm²). The surface morphology was carefully characterized under the optical microscope, scanning electron microscope (SEM) and atomic force microscope (AFM). Ripples were observed on the irradiated areas even at the normal FIB incidence angle, which is not consistent with the Bradley–Harper (BH) rippling model. The orientation of ripples relies on crystallographic orientation rather than projected ion beam direction as predicted by BH model. The ripple wavelength is independent of ion dose, while ripple amplitude increases with ion dose. It is found that the ripples are formed by self-organization due to anisotropic surface diffusion in the low melting point metal.     

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14T核磁共振成像超导磁体电源拓扑设计及纹波抑制

根据14T 核磁共振成像(MRI)大电感超导体磁体(电感307H、连接阻抗2mΩ)负载纹波的需求(低压为3V、电流为1500A、电流纹波小于1ppm)，基于常见拓扑结构出现的问题，提出了一种适用于这种大电感超导磁体运行电源的拓扑结构。此拓扑结构采用多级处理、无源滤波和有源滤波相结合的思想来设计。介绍了电源的输入级、中间变换级及输出级三个部分的拓扑，并阐述了各部分拓扑设计对负载电流纹波抑制的作用。通过 Matlab 仿真分析，验证了拓扑设计的合理性。     

Tuning of ripple patterns and wetting dynamics of Si (100) surface using ion beam irradiation

Ripple patterns on Si (100) surface have been fabricated using 200 keV Ar⁺ oblique ion beam irradiation. Dynamical evolution of patterns is studied for the fluences ranging from 3 × 10¹⁷ ions/cm² to 3 × 10¹⁸ ions/cm². AFM study reveals that the exponential growth of roughness with stable wavelength of ripples up to higher fluence values is lying in the linear regime of Continuum models. Stylus Profilometer measurement was carried out to emphasize the role of sputtering induced surface etching in ripple formation. Rutherford Backscattering Spectroscopy shows the incorporation of Ar in the near surface region. Observed growth of ripples is discussed in the framework of existing models of surface patterning. Role of ion beam sputtering induced surface etching is emphasized in formation of ripples. In addition, the wetting study is performed to demonstrate the possibility of engineering the hydrophilicity of ripple patterned Si (100) surface.     

VIRTUAL WAITING TIMES IN PRIORITY-M/G/1 QUEUES WITH VACARIONS

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