整体柱用于糖蛋白质分离富集研究新进展

蛋白质糖基化是最常见、最重要的蛋白质翻译后修饰之一,由糖链和多肽链以多种形式共价修饰而成.糖蛋白在生物体内种类繁多,分布广泛,具有重要的生理功能.复杂生物体系中糖蛋白的绝对丰度低,高丰度非糖蛋白质的存在对低丰度糖蛋白质产生夹带、包覆以至掩盖的作用,以现有的技术难以发现并分离鉴定大多数低丰度糖蛋白,已成为当前糖蛋白质组学...     

涉及重级零点的亚纯函数的拟正规定则

设F为区域D内的只有重级零点的亚纯函数族,H(z)为区域D内的非常数亚纯函数,且存在v∈N,使得对于任意的a∈C,n(D,1/H(z)-a)≤v.如果对于任意的f∈F,f′(z)≠H′(z),那么F在区域D内v阶拟正规.     

非贵金属期货市场对白银期货市场的贝叶斯非线性效应研究

选取2012年8月13日至2013年9月16日的各金属期货周收盘价构成的平衡面板数据,以黄金期货价格为转换变量,本文利用贝叶斯面板平滑转换模型探索非贵金属与白银期货可能存在的非线性关系.研究结果表明,铜、铝、螺纹钢市场与白银期货市场具有时变的非线性关系.因此,投资者可以根据非贵金属期货价格走势更好的对白银期货投资价值进行评估,从而提高投资决策的科学性.     

微积分中值定理间的关系

直观地阐述从微分中值定理到积分中值定理,乃至第二积分中值定理的演绎过程,指出积分中值定理的实质仍是微分中值定理,并在经典积分中值定理的条件下,得到更强的结论。     

Notch Test for Radial Sensitivity on Neutron Density Distribution in ^48Ca Probed by α-Particle Elastic Scattering

Notch tests are made to study the sensitive regions in the neutron density distribution in the ground state of^48 Ca probed by the angular distributions of differential cross sections of α-particle elastic scattering at 104 MeV with optical model potentials calculated by using a systematic single-folding model. An improved notch scheme is proposed, which perturbs the neutron density distribution of the target nucleus locally. Results of the notch tests show that the angular distribution of differential cross sections for α particle elastic scattering at 104 MeV only probe the surface of the neutron density distribution in ^48Ca.     

固绿FCF褪色分光光度法测定利福平

采用可见分光光度法研究了固绿FCF与利福平的显色反应.实验表明,在水溶液中,在pH6.6-7.5的条件下,固绿FCF与利福平在室温下即可形成稳定的络合物,最大褪色波长λmax=655nm,表观摩尔吸光系数（ε）为2.44×105L/（mol·cm）,线性范围是0-0.82mg/L,线性回归方程为A=0.00228-0.2997ρ,r=-0.9985,相对标准偏差为1.0％-1.2％（n=6）,方法简便、快速、准确、灵敏.     

250 keV He+ 离子注入钽酸锂改性研究

室温下,将能量为250 keV He+ 离子注入z 切钽酸锂单晶,注量范围5.0x1014~5.0x1016 He+/cm2,应用三维轮廓仪、X射线衍射(XRD)、紫外可见(UV-Vis ) 光学吸收谱对未注入和注入样品进行了表征和分析。分析结果表明,在注量达到5.0x1016He+/cm2 时,样品表面出现大量凸起条纹,同时晶格沿着[001] 方向出现明显肿胀,吸收边则表现出明显的注量相关性。注入样品在空气中放置60 d后,最高注量的样品表面原来凸起的条纹变为细长的裂纹,晶格应变及光学吸收边均出现较大的恢复。讨论了样品表面形貌、晶格应变和光学吸收边与He 行为的关系。The effects of 250 keV He + implantation in the fluence from 5.0x1014 to 5.0x1016 He+/cm2 on lithium tantalate at room temperature were investigated by 3D surface profiler, XRD and UV-Vis optical absorption spectroscopies.The experimental results show that a large number of raised stripes appear on the surface of the sample and the significant lattice swelling occurs along the direction [ 001 ] at the fluence of 5.0x1016 He+/cm2. The dependence of changes absorption edge on the fluences was revealed. After the samples had been exposed to the air for 60 days, the raised stripes on the surface have evolved into narrow cracks. Furthermore, the lattice strain and the optical absorption edge has also recovered dramatically. The relationship between surface morphology, lattice strain, optical absorption edge and behaviorof He-ions was discussed.     

He 离子注入引起的高纯钨硬化

完成了不同注量或温度下100 keV 的He 离子注入高纯钨的实验,并利用纳米压痕技术测量了材料的微观力学性能。所有注入样品的纳米硬度值都高于未注入样品的纳米硬度值。对于室温注入样品,随着注量的增加,样品抗弹性变形能力下降;当注量不高于5x1017 ions/cm2 时,钨的纳米硬度峰值随着注量的增加而增加;注量为1x1018 ions/cm2 的钨样品的纳米硬度峰值反而降低。高温注入样品的抗弹性变形能力优于室温注入样品的抗弹性变形能力;随着注入温度的增加,样品的平均纳米硬度值和弹性模量略有下降。分析讨论了He 注入钨硬化和抗弹性形变能力降低的可能原因。Tungsten has been selected as divertor materials in fusion reactors because of its high thermal conductivity,high melting point, low expansion coefficient and high threshold energy for sputtering etc. The paper presents the hardening behaviour of high pure tungsten by 100 keV He+ with different fluences from 5x1016 ions/cm2 to 1x1018ions/cm2 at room temperature, and with fluence of 1x1018 ions/cm2 at higher temperatures (400, 600 and 800 °C). The microscopic mechanical properties of these samples were investigated by nano-indentation technology. The results show that all of the implanted samples harden obviously. The reason for hardening may be that defects of interstitial dislocation loops or dense helium bubbles etc induced by helium implantation obstacle the movement of dislocation. The peak nanohardness of the samples increased with the fluences increasing when the fluence is not more than 5x1017 ions/cm2, while the nano-hardness value of the implanted sample with the fluence of 1x1018 ions/cm2 decreases and the nano-hardness changes little in the region of 50 nm to 200 nm from surface. For all the implanted samples with 1x1018 ions/cm2 at higher temperatures, their nano-hardness values are similar, but show a trend of decrease with increasing temperature.The reason may be the decrease of the defects’ density during implantation at higher temperatures. In addition, the capability of resisting deformation for the implanted tungsten reduces with increasing fluence and increases a little at higher temperatures.     

双平衡式相干接收原理及其在外差干涉仪中的应用研究

利用琼斯矩阵理论推导了光学双平衡式相干接收的原理,得到了具有正交相关性的包含全部光学信息的IQ信号,给出了基于IQ正交信号解调待测光信号信息的信号处理算法.基于该原理设计了一种高速微机电系统扫描式激光外差干涉仪,得到了待测玻璃的厚度信息分布图.该干涉仪的波前相位差提取准确度可高达0.01 rad、测量速度可达40 frame/s、最大测量直径可达到300 mm,在实时光学检测方面有广阔的应用价值.     

基于光闪烁法的烟气流速反演和路径加权函数的分析

为了对工业管道排放的污染气体的流速进行连续监测,设计了一种双路平行对射式烟气流速测量系统,并对基于光闪烁法测量烟气流速的相关理论进行了研究.利用相位屏技术对湍流介质中的光闪烁现象进行了理论分析,得到了用于工业管道烟气流速反演的光闪烁互相关的表达式.对烟气流速反演过程中平均流速的路径加权问题进行了探讨,给出了路径加权函数,数值模拟表明路径加权函数具有近似高斯线型的轴对称分布特性,反映出管道中心流速对于平均流速的较大贡献.在此基础上,分析了光源光谱对路径权重函数的影响,实验证明由于光源光谱具有一定的带宽,使得路径加权函数值有一定的变化,但加权函数的分布形状保持不变.对于平均流速的路径加权函数的分析为计算工业管道中烟气流速的空间分布提供了依据.