Banach空间中一类微分方程整体解性质

本论文，把描述微分方程整体解性质的著名定理Ｗｉｎｔｎｅｒ定理由原来的 Ｒｎ空间推广到 Ｂａｎａｃｈ空间。为证明推广后的结论成立．首先给出了四个引理．其中这四个引理在特殊的Ｂａｎａｃｈ空间──—Ｒｎ空间中是作为有关解的基本性质定理出现的［１］．     

花岗岩磨削磨粒破碎性能研究

花岗岩是一种含硅酸量较多的酸性深层岩。目前国内的石材加工由于磨削工艺不尽合理,磨削质量不符要求,因而需依靠进口磨具。本实验通过不同磨料对不同花岗岩进行单颗粒磨削,探索其规律,为合理选择和使用磨具提供理论依据。     

南京地区中风化较软岩地区嵌岩桩单桩竖向承载力计算分析

对南京地区嵌岩桩桩基设计中新旧国家桩基规范、地方规范及公路和铁路行业规范结合工程实例进行了分析比较,得出了不同规范所得单桩竖向承载力的相应关系,为该地区嵌岩桩设计提供参考.     

利用有机溶剂法快速纯化绿色荧光蛋白

介绍非色谱GFP纯化方法——有机溶剂纯化法．该方法在短时间内（30min）即可获得大量较高纯度（91．7％）,且荧光光谱特征不改变的GFP蛋白．纯化过程简单,无需昂贵的仪器和设备,适合绝大多数中小实验室使用．     

等跨等截面连续体系频率的精确计算

大量的工程实践表明连续T梁桥(通常采用先简支后结构连续施工)的基频并不符合《公路桥涵设计通用规范》(JTG D60—2015)条文说明给出的连续梁桥基频计算公式。为此,本文首先采用多坐标法从理论上推导等截面多跨连续梁桥的基频计算公式;再结合某2及3跨等截面连续梁桥模型,对有限元分析、理论计算及规范公式的结果进行对比;最后对一座实际连续T梁桥的实验、有限元分析、理论计算结果进行比较。结果表明:等跨、等截面连续梁桥的基频符合相同跨径、相同截面简支梁桥的计算公式;等跨、等截面连续梁桥n(≥2)阶次的频率随着跨数的增加,逐渐减小,当跨数趋于无穷大时,趋近于基频。     

肉芝软珊瑚素全合成的研究：Ⅲ.肉芝软珊瑚素的合成

由3,7-二甲基-6,7-环氧-8-苯硫基-2-辛烯醛和6-甲基-8-三甲硅氧基-6-烯-2-酮-1-辛酸乙酯通过羟醛缩合、内酯化、Wittig反应、闭环等反应合成得肉芝软珊瑚素,总产率10.6％。其中的关键步骤是以硫稳定的碳负离子烷基化。讨论了合成品的立体化学。     

Influence of acid leaching and calcination on iron removal of coal kaolin

Calcination and acid leaching of coal kaolin were studied to determine an effective and economical preparation method of calcined kaolin. Thermogravimetric-differential thermal analysis (TG-DTA) and X-ray diffraction (XRD) demonstrated that 900℃ was the suitable temperature for the calcination. Leaching tests showed that hydrochloric acid was more effective for iron dissolution from raw coal kaolin (RCK), whereas oxalic acid was more effective on iron dissolution from calcined coal kaolin (CCK). The iron dissolution from CCK was 28.78wt%, which is far less effective than the 54.86wt% of RCK under their respective optimal conditions. Through analysis by using M?ssbauer spectroscopy, it is detected that nearly all of the structural ferrous ions in RCK were removed by hydrochloric acid. However, iron sites in CCK changed slightly by oxalic acid leaching because nearly all ferrous ions were transformed into ferric species after firing at 900℃. It can be concluded that it is difficult to remove the structural ferric ions and ferric oxides evolved from the structural ferrous ions. Thus, iron removal by acids should be conducted prior to calcination.     

Simulation of wind gust structure in the atmospheric boundary layer with Lattice Boltzmann Method

Cold fronts occur in northern East Asia during winter and spring.After cold frontal passage,airflow is downward and accompa-nying strong winds fluctuate significantly;this is termed wind gusts.Analysis of observation data shows that wind gust structure has coherent characteristics.This is important for entrainment of spring dust storms into the upper boundary layer,where they are transported great distances.The Lattice Boltzmann Method(LBM) is a computational fluid technique based on the Boltzmann transport equation.The LBM has been used to study complex motion such as turbulence,because it describes motion at the micro level.In this paper,Large eddy simulation is introduced in the LBM,enabling simulation of turbulent flow in the atmospheric boundary layer.The formation and development of wind gusts are simulated,and a coherent structure with a combination of wave and vortex is obtained.This explains the mechanism of soil erosion and sand entrainment by the coherent structure of wind gusts.     

利福定对果蝇寿命的影响

本文研究利福定喂饲果蝇对其寿命的影响。试验组液体饲料分别含利福定10、5和2.5ppm,结果发现这三个浓度的利福定对果蝇均有延寿效应,其中,10ppm的利福定对雄果蝇的延寿效果最好,平均寿命延长22.4％(p<0.05),5ppm的利福定对雌果蝇的延寿效果最好,平均寿命延长19.2％(p<0.05)。而且,它们的最高寿命也有显著延长,提示利福定是一种较好的抗衰老药物。     

高压除鳞喷嘴内部流场数值模拟与仿真分析

针对目前工厂广泛使用的高压除鳞喷嘴,应用前处理软件Gambit建立其内部流畅的三维模型,采用Fluent软件提供的Laminar层流模型对不同结构参数的喷嘴内部不可压缩、稳态、层流流场进行了数值模拟,并分析了各参数对其流场速度分布、压力分布和出口轴心速度的影响.仿真值与理论计算值十分接近,数值模拟结果表明,喷嘴收缩角和直径对其内部流场影响较大,而扩张角对其内部流场影响相对较小,但各参数都存在最优值,且各参数之间也存在着最优搭配使射流打击效果最好.