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.     

H212毛织机定位开关车控制器

论述了Ｈ２１２毛织机产生开车档子的原因，介绍了Ｈ２１２毛织机定位开关车控制器的基本原理及功能以及它对消除Ｈ２１２毛织机开车档子的作用     

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.     

Computation of the Magnetic Field and Ripple for the Toroidal Coils in HL-2M Tokamak

The magnetic induction and its ripple due to reconstructive toroidal coils are calculated. The field ripple is so small that the influence of ripple can be omitted for the plasma discharge.     

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.     

Nanowear studies in chemically heterogeneous responsive polymeric brushes by surface force microscopy

In this study, we present nanowear studies using surface force microscopy (SFM), on nanoscopic thin films of reversibly switchable binary polymer brushes [polystyrene (PS) + poly(2-vinylpyridine) (P2VP)] and respective monobrushes [polystyrene and poly(2-vinylpyridine)] synthesized via “grafting to” method. The aim was to tune the wear in nanothin polymer brush surfaces. Therefore, the effect of conformational switching of PS + P2VP brush on treatment with selective solvents for PS and P2VP chains on the wear process was investigated. Wear process on thick spin-coated films of PS and P2VP was also investigated for comparison. Nanowear experiments were performed using SFM tip by repeating scans over the surface to follow the wear process closely. The wear process on different surfaces was explained on the basis of molecular entanglement as well as adhesion and friction on the sample surface. For spin-coated PS film as well as PS and PS + P2VP brush surfaces (treated with toluene) with molecular entanglements at surface, wear mechanism involved formation of ripples. However, in case of spin-coated P2VP films as well as P2VP and PS + P2VP brush surfaces (treated with ethanol) with no molecular entanglements at surface, wear occurred via removal of polymer chains and their accumulation at the rim. For PS + P2VP surface treated with acidic water, wear mechanism was complex and inhomogeneous ripple formation was followed by formation of heaps of polymeric material in the center of scanned area. The extent of wear as measured either by root mean square roughness of the surface or spacing between the ripples, increased with the number of scans for all the surfaces. Our study shows that wear mode of polymer brush surfaces is different for different polymers and can be controlled/tuned by the use of binary polymer brushes.     

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

ＶＩＲＴＵＡＬＷＡＩＴＩＮＧＴＩＭＥＳＩＮＰＲＩＯＲＩＴＹ－Ｍ／Ｇ／１ＱＵＥＵＥＳＷＩＴＨＶＡＣＡＲＩＯＮＳＣＯＮＧ，ＴＡＮＧＤＡＣ（ＤｅｐａｒｔｍｅｎｔｏｆＭａｔｈｅｍａｔｉｃｓ，ＵｎｉｖｅｒｓｉｔｙｏｆＡｍｓｔｅｒｄａｍ，ＰｌａｎｔａｇｅＭｕｉｄ...     

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．     

大中型兽类踪迹在野外考察及研究中的应用

在野外兽类考察过程中，由于多数兽类喜欢展昏活动或昼伏夜出，加上一些外界因素的影响，工作人员要对兽类进行直接的目的性观察和持续性研究有一定的难度．但由于动物的某些生物学特性，不同兽类的活动会在野外留下特定的踪迹，这为野外鉴别、观察和研究提供了重要的线索．本文总结了影响对大中型兽类进行直接性观察的因素、野外兽类踪迹的表现形式以及兽类的野外遗留物在有关研究中的应用，以期为野外考察与研究提供一定帮助．     

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。