Detection of TNT by a molecularly imprinted polymer film-based surface plasmon resonance sensor

A surface plasmon resonance(SPR) sensor using a molecularly imprinted polymer(MIP) film as a recognition element for detection of 2,4,6-trinitrotoluene(TNT) was developed.The TNT-imprinted polymer film was prepared by thermo initiated polymerization on the bare Au surface of an SPR sensor chip.Template TNT molecules were quickly removed with an organic solution of acetonitrile/acetic acid(9:1,v/v),causing a shift of 0.7° in SPR angle.The limit of detection for TNT was demonstrated to be as low as 1×10-8 mol/L.In the concentration range of 1×10-8-1×10-5 mol/L,the change of SPR angle was linear with the negative logarithm of TNT concentration,Selectivity studies showed that the SPR sensor had no response to TNT analogues 2,4,5-trinitrotoluene and 1,3,5-trinitrohexahydro-1,3,5-triazine at a concentration of 1×10-4 mol/L.The results suggest that the SPR sensor combined with a MIP film has the advantages of high sensitivity and selectivity,and long-term stability toward the analyte TNT.     

加工表面形貌的在线检测和识别

本文阐叙了一种基于光针法的表面形貌测量装置,它能在线测量加工工件圆周方向的波纹度和轴向表面轮廓形貌,其垂直分辨率为0.02～0.10μm,横向分辨率为30～50μm。切削试验表明,该装置还能够在线识别刀尖上的积屑瘤、切削过程中的颤振和刀具磨损对加工表面形貌的影响。     

场源面上场值的探讨

现行《电磁学》教材认为场源面上的场值是不存在的。本文通过论述、分析与计算,证明场源面上的场值不但存在,而且还是确定的。因此,在写场的函数式及画场的分布曲线时,应把场源面上的场值表示出来。     

小五台山北台北坡植被垂直带的表土花粉及其气候意义研究

在对小五台山北台北坡垂直带的植被进行全面考察的基础上,建立了垂直带的表土花粉谱,分析了白扦、华北落叶松和桦等物种的气候指示意义。研究表明：桦属和松属在表土中的花粉百分含量大于群落中植物的盖度,具超代表性;云杉的花粉百分含量与植物在群落中的盖度基本符合;落叶松由于花粉产量低,保存能力差,则具有低代表性。就其气候指示意义来说,白扦指示冷湿生境,华北落叶松指示冷干生境。桦属的生态幅度较宽,其中风桦最耐寒,白桦较耐旱。     

Viscosity behavior of magnetic suspensions in fluid-assisted finishing

Magnetic fluid-assisted finishing has been verified both theoretically and experimentally as an effective fabrication technology for optical mirrors and lenses. The purpose of this paper is to introduce a novel design of polishing tool and demonstrate the possible applications of this technology. The work includes studying the viscosity of the magnetic suspensions of micrometer-sized Carbonyl iron particles under the influence of a magnetic field. Both the cases of magnetizable suspension with and without abrasive cerium oxide particles are studied for their ensuing polishing effectiveness. Determination of material removal function is conducted using a Wyko Nat1100 interferometer. Experiments to reduce surface roughness with the proposed tool are also performed using a K9 mirror as the work-piece. Results show that the surface accuracy is improved over three times to less than 0.5 nm after two cycles of polishing.     

基于分子印迹膜的表面等离子体共振传感器检测黄体酮

分别采用热聚合和光聚合的方法在金膜表面合成黄体酮分子印迹膜,并将其作为识别元件应用于表面等离子体共振传感器检测黄体酮. 通过对其进行洗脱及吸附研究发现:采用乙腈/乙酸混合液可以快速将黄体酮洗脱下来,洗脱前后共振角分别移动了1.15°和0.72°;该传感器实现对黄体酮的最低检测限均为10-14 g/mL;在10-14～10-6 g/mL的浓度范围内,共振角度的变化与黄体酮浓度的负对数成线性关系. 同时将具有黄体酮识别位点的分子印迹膜分别吸附浓度为10-4 g/mL的雌二醇,睾酮和睾酮丙酸酯溶液,结果显示均没有非特异性吸附作用. 以上结果表明,基于黄体酮分子印迹膜的表面等离子体共振传感器能够对黄体酮实现快速定量的专一性检测.      

基于变曝光时间图像采集法提高SPR相位成像检测灵敏度

提高表面等离子体共振（SPR）阵列检测的灵敏度是蛋白质组学和药物发现与开发的迫切需要。提出了一种基于五步移相时域调制相位干涉成像的变曝光时间图像采集法,通过增大信号幅值来提高光强测量信噪比。在一个相位测量周期的5帧图像中,每帧图像都采用不同的曝光时间,使得每帧图像的灰度值达到最大,从而提高光强测量的信噪比,保证相位成像...     

非离子型表面活性剂和脂肪醇相互作用规律的研究

本文用表面张力法和增溶PAN法研究碳原子数相同的脂肪醇结构对其和非离子型表面活性剂 P-1,1,3,3-四甲基丁基苯酚聚氧乙烯醚-10(TX-100)相互作用影响的规律,实验表明,两种方法的结果是一致的。     

(Na_(0.3)K_(0.7))NbO_3铁电半导体陶瓷的PTC效应

本文研究了GeO_2-K_2CO_3和MoO_3掺杂的(Na_(0.3)K_(0.7))NbO_3铁电半导体陶瓷的PTC效应。导出了存在粒间相情况下铁电体表面势垒表示式,这是对Heywang模型的一种修正,利用修正的Heywang模型对(Na,K)NbO_3半导体陶瓷的PTC效应进行了解释。     

金属中电子等离激元(plasmon)运动方程的推导

由于金属中电子-晶格离子系统的哈密顿式较复杂,如其中含有四个电子产生、湮灭算符乘积的项,使人们在推导其相应的电子等离激元运动方程时感到困难.本文讨沦了此相互作用哈密顿项的奇点问题,并对运动方程作了严格推导.