模拟海市蜃楼实验的配液新方案

分析了配制传统模拟海市蜃楼溶液的方法的不足,提出了新的配制溶液的方案,推导出了所配制的溶液浓度梯度随高度的分布公式,从而使实验过程中配液的时间大大缩短,实验现象更加明显,提高了实验的成功率.     

电感耦合等离子体质谱(ICP-MS)法测定地质样品中Cu和Zn的干扰研究

电感耦合等离子体质谱(ICP-MS)法标准模式测定地质样品中Cu和Zn时,样品溶液中Ti在高温下易形成TiO⁺和TiOH⁺产生离子重叠干扰,使测定值偏离真值而影响测定结果。采用氢氟酸-高氯酸-硝酸消解、王水复溶样品,通过多级在线校正⁴⁶Ti¹⁶O⁺,消除TiO⁺和TiOH⁺离子重叠干扰,研究了单质Ti与⁴⁶Ti¹⁶O⁺、质荷比63、64、65、66离子间存在的关系,建立了一种电感耦合等离子体质谱(ICP-MS)法测定地质样品中Cu和Zn的分析方法。结果表明：单质Ti对Cu和Zn产生的干扰值与其质量浓度呈非简单的正相关性,TiO⁺产生的干扰离子质荷比65离子强度比63高,质荷比64离子强度比66高;⁴⁶Ti¹⁶O⁺对质荷比63、66离子干扰增量值与单质Ti质量浓度变化无关;^6...     

Near-field manipulation of terahertz surface waves by metasurfaces [Invited]

Surface waves(SWs) are a special form of electromagnetic waves that travel along the boundary between a metal and a dielectric. The special optical properties of SWs render them very attractive in applications, such as subdiffractional lithography, novel biochemical sensors, and ultrafast integrated circuitries. Herein, we present a review of our recent progress in excitation and manipulation of terahertz SWs due to interference or coupling between a pair of slit resonators in metasurfaces, showing the ability to devise ultrathin and compact plasmonic components.     

几例容易重复计数的排列组合问题的剖析

几例容易重复计数的排列组合问题的剖析欧阳陆军（湖南平江四中４１０４１１）学生在解排列组合题时，往往容易出现重复计数的情况，现对几例容易重复的问题举例剖析如下．例１从５本不同的数学书中任取２本，有多少种不同的取法？错解完成这件事可分为两个步骤，第一步从...     

Equilibrium dialysis of metal-serum albumin (Ⅱ)——Allosteric effect in Ni(Ⅱ)-serum albumin systems

Detailed studies were carried out on equilibrium dialysis of the binding of Ni2++ ion to human scrum albumin (HSA) and bovine serum albumin (BSA).The successive stability constants were obtained by the Icfisi squares fitting.The eight binding sites found for both Ni(Ⅱ)-HSA and Ni(Ⅱ)-BSA systems can be divided into two different sets; and for both systems,there exist two identical prior binding sites where the bound Ni2+ ions can he con sidered as allosteric effectors,which induce the allosteric effect in accordance with the model proposed by Moeod et al As indicated by allosteric parameters,the ability of R-state to bind Ni2+ ions is ca 100 times as much as that of T state,and the conformation of HSA is markedly tenser than that of BSA.     

利用打点计时器验证f=μN并测量滑动摩擦系数

f=μN是从实验得出来的规律,但在一般的教材上只定性地给予说明。既使设计了验证实验,也是很粗糙的。比如高中课本上,是采用物体在匀速直线运动时所受的合外力为零这一原理,通过测量对物体的拉力,求出物体所受的摩擦力,从而得到滑动摩擦系数。从理论上分析这是可行的,但实际上在测量中存在一些问题。在实验中,是凭着肉眼的观察来判断物体是不是作匀速     

固体C60取向相变的理论研究

本文提出固体Ｃ６０分子间合理的相互作用势模型，利用对称性适函数描述了晶体场及取向模间耦合，并通过自由能的计算得出相变模及与实验相符的取向相变温度。     

Transition to Antispirals in the Complex Ginzburg-Landau Equation

We report a continuous transition from outwardly rotating spiral waves to antispirals in the complex GinzburgLandau equation. Numerical simulations demonstrate that the normal spiral to antispiral transition is fulfilled through a rest spiral wave with zero propagation speed. The propagation direction of spiral waves and the power law behaviour close to the transition boundary are examined.     

喷涂法制备高效率三元体系聚合物太阳能电池

采用喷涂技术制备了能量转化效率为9.06%的三元体系聚合物太阳能电池,该太阳能电池在卷对卷印刷和规模化生产中具有极大的应用潜力。     

一种简便合成2-丁炔-1,4-二醇衍生物的新方法

由2-丁炔-1,4-二醇可以很方便地得到2-丁炔-1,4-二氯,这一试剂在有机合成中有着广泛的应用。而在其它条件相同的情况下,制备2-丁炔-1,4-二溴并未得到相应较好的结果。我们用无水苯为反应溶剂,以温和的 (PPh3)PBr2作为卤代试剂(冰浴下液溴逐滴滴入PPh3苯溶剂中当场生成)卤化2-丁炔-1,4-二醇,选择性合成得到2-丁炔-1,4-二溴衍生物。同时也实现了2-丁炔-1,4-二醋酸酯的合成。