高效液相色谱质-谱联用法测定西加鱼毒素P-CTX-1

建立了对西加鱼毒素中主要成分P-CTX-1的高效液相色谱质谱联用检测方法。色谱条件为色谱柱C18(2.1mm×50mm,1.7μm),柱温40℃。以0.1%甲酸-5mmol/L乙酸铵水溶液和乙腈溶液作为流动相,梯度洗脱(0～3.0min50%A→5%A,3.0～4.5min5%A→50%A),流速为0.6mL/min。质谱条件为电喷雾正离子模式,[M+NH4]+作为前体离子进行多级反应监测,以质荷比(m/z)为1058和1076的子离子分别作为P-CTX-1的定性和定量离子,源温度105℃,喷雾温度350℃,提取电压4.0V,锥气流速49mL/min,喷雾气流速750L/h。在此检测条件下西加鱼毒素P-CTX-1的检出限达0.175μg/L,平均加标回收率为66.0±2.0%,相对标准偏差为6.0%。利用该方法检测了6份采自西太平洋珊瑚礁的鱼类样品,在其中5份样品中检测出P-CTX-1。     

合瓦形变音钟拍频现象的实验研究

描述了古代合瓦形变音钟(复制品)的"拍频"声学特征,阐述了其发声的理论原理.通过实验,比较和分析了在钟上不同的位置点以及在不同的温度下敲击后所产生"拍频"现象,并从频谱分析上解析了其中的成因.     

基于反铁电PLZST厚膜相变脉冲电流的温度传感方法

采用LTCC低温共烧工艺制备了(Pb0.97La0.0 3)(Zr0.75Sn0.25-xTix)O3(x=0.10,0.105,0.11)系列组分反铁电陶瓷厚膜功能材料。实现了对预定温度的灵敏热电换能响应,温度诱导相变电流密度达10-5A·cm-2量级。采用电流/电压转换、自动增益控制和负载增强模块构成的信号处理电路系统,产生面向后级控制应用的TTL脉冲触发信号(4.8±0.2 V),实现基于PLZST厚膜相变电流的温度传感方法与系统,为新型功能材料温度传感控制提供了一种新的技术途径。     

过渡层结构和生长工艺条件对Si基GaN的影响

为了提高MOCVD外延硅基GaN材料的质量，在硅（111）衬底上以HT-AlN为缓冲层，在缓冲层上再生长变组份过渡层后外延生长GaN。过渡层为多层复合结构，分为高温变组分AlGaN、GaN、低温AlN、高温变组分AlGaN。在高温生长AlGaN和GaN层中插入一层低温生长AlN以缓解降温过程中应力对厚GaN层的影响，为了缓慢释放热应力、采用合适的慢降温工艺。当外延层的厚度小于1．7微米时GaN外延层无龟裂，而厚度不断增加时，GaN外延层产生龟裂。本文研究了AlN缓冲层生长温度、高温变组分AlGaN生长过程中生长时间的变化对所生长GaN材料的影响。采用三维视频显微镜、高分辨率双晶X射线衍射（DCXRD）、扫描电子显微镜（SEM）、原子力显微镜（AFM）和室温光致荧光光谱（RT-PL）对样品进行了测试分析。测试结果表明所研制的硅基GaN表面光亮、平整，过渡层的引入有利于降低外延层中应力，提高GaN结晶质量。     

数码相机在液体黏度测量中的应用

采用数码相机拍摄数字影像并输入计算机,通过Flash MX软件工具对物理现象进行动态的实验研究,实现了液体黏度的测定.     

BEHAVIOR OF OBSTRUCTED SQUARE BUOYANT VERTICAL JETS IN STATIC AMBIENT (Ⅰ)-VERIFICATION OF MATHEMATICAL MODEL AND NUMERICAL METHOD

Some experiments were made for the buoyant jet from a square orifice with a square disc placed on it in static ambient and concentration along the axis in self-similar area behind disc was measured. And at the same time a three-dimensional mathematical model was established to simulate the whole flowing under different conditions. All the results predicted by the numerical calculation were substantiated by the experiments.The results were compared with experiential formula for obstructed round buoyant vertical jets in static ambient and it was found that the two concentration distributions had good accordance. Star shape of temperature isolines on cross-sections in the near areas from the disc was found and it was a very special figure for obstructed square buoyant vertical jets with a square disc. The shape will transform to concentric circles gradually alike to the round buoyant vertical jet in self-similar area with increasing of the distance from the disc.     

聚集体分子的基频和高阶线性Raman散射研究

本文报道了2,2′菁染料的J聚集体吸附于银胶体的表面增强基频和高阶线性Raman散射效应,分析了基频和高阶线性Raman光谱随染料溶液浓度的变化关系。结果表明,J聚集体分子在银胶体表面具有一个稳定的吸附结构,且侧立吸附于表面,一些低波数振动模式起因于J聚集体分子。高阶线性Raman散射的增强与J聚集体分子的性质有关。 关键词：     

焙烧高岭土的相变研究

对湿化学方法处理过的高岭土作不同温度焙烧得不同样品，对不同样品进行XRD研究表明，高岭土随焙烧温度的不同发生一系列相应。用DTA，TG，IR对其相变进行了印证，得到了一致的结果。     

Mobius不变梯度和α-Bloch函数

从次调和性入手 ,研究了复超球上 α- Bloch函数关于 M-不变梯度的性质 ,证明了 f∈Bα当且仅当 supa∈ B1v(E(a,r) ) ∫E( a,r)| ～ f (z) | p(1- | z| 2 ) p (α-1) dv(z) <∞ ;或者 supa∈ B∫B(1- | z| 2 ) p (α-1) | ～ f (z) | p(1-|φa(z) | 2 ) nqdλ(z) <∞ ;或者 supa∈ B∫B(1- | z| 2 ) p(α-1) | ～ f (z) | p Gs(z,a) dλ(z) <∞ .当α =1时 ,推广了欧阳才衡等的相应结果     

A STUDY ON SURFACE-ENHANCED HYPER-RAMAN SCATTERING OF BASIC FUCHSIN ADSORBED ON THE SILVER COLLOID

This paper presents the surface-enhanced hyper-Raman scattering (SEHRS) effect of basic fuchsin (BF) adsorbed on the silver colloid. On the basis of the absorption spectra, a new absorption band at 1000nm has been observed in the case of BF adsorption on the silver colloid, The result indicates that surface electromagnetic enhancement also appears at the incident photon frequency in the near-IR region, which plays an important role in the SEHRS signals. The electromagnetic enhancement factor (2.0×l0⁴) is estimated by using electromagnetic model. Additionally, surface-enhanced second-harmonic generation (SHG) effect in the cases of pure silver colloid, silver colloid plus adsorbed molecule and KCl solution has been detected.