超薄Ag膜的椭偏光谱建模及解谱

用直流溅射法制备了6个不同厚度的超薄Ag膜。结合超薄Ag膜的结构特点,采用了Drude模型联合Lorentz Oscillator模型的解谱方法,得到1～6号样品的厚度分别为4.0,6.2,12.5,26.2,30.0和40.6 nm。从拟合结果的消光系数k图谱中发现,在1号到4号样品中分别于430,450,560和570 nm处出现了表面等离子体共振峰(SPR),随膜厚的增加共振峰宽化且峰位红移。最后,利用SPR理论计算出不同厚度Ag薄膜等离子体共振峰出现的位置,并和实验结果进行了比较。     

大气压等离子体射流重整CH4-CO2制合成气

采用大气压等离子体射流,以CH₄和CO^₂直接作为放电气体进行常压下重整制合成气的实验研究,考察了等离子体射流的放电特征及放电距离、放电功率、原料气配比和流量对反应的影响。结果表明,该等离子体具有放电稳定、均匀的特征。重整反应的主要产物为合成气,只有少量的H₂O和积炭生成。优化的反应条件为放电距离为9mm,CH₄和CO₂的摩尔比为4/6。当原料气流量为1000mL/min,放电功率为88.4W时,CH4和CO₂的最高转化率为分别为94.99%和87.23%。甲烷和二氧化碳的转化率随放电功率的增加而增加,随流量的增加而减少。     

Simultaneous quantitative analysis of ketanserin and ketanserinol in plasma by RP-HPLC with fluorescence detection

A sensitive and selective high-performance liquid chromatographic assay for the quantification of ketanserin and ketanserinol in human plasma was developed and validated. The procedure involves extraction of ketanserin and ketanserinol from plasma using an Extrelut NT-1 solid-phase extraction column. The chromatograph was equipped with a Hypersil BDS column (100 x 4.5 mm, 3 micro m particle size). Separation was performed with a mixture of acetate buffer 0.01 M, pH 4.9-methanol-acetonitrile (52:40:8, v/v/v). Detection was performed with fluorescence detection (lambda(ex) = 332 nm and lambda(em) = 410 nm). Calibration curves were linear (r(2) = 0.999) in the range 0-400 ng/mL for both ketanserin and ketanserinol. The repeatability coefficient for ketanserin and ketanserinol was 3.1 and 3.0%, respectively. The reproducibility coefficient for ketanserin and ketanserinol was 10.5 and 9.1%, respectively. The limit of quantification for both ketanserin and ketanserinol was 2.0 ng/mL. The mean recovery yield for both ketanserin and ketanserinol was 60%. In an 8 h work day approximately 60 samples, including calibration and reference standards, could be processed.     

Temperature Dependence of InSb Reflectivity in the Far Infrared: Determination of the Electron Effective Mass

We measured the dependence of the reflectivity of InSb crystals upon temperature in the submillimeter region using monochromatic radiation from an optically pumped far infrared (FIR) laser. The measures allowed us to determine the value of the electron effective mass at low temperatures with radiations of different frequencies. Our measurements extend the results obtained recently on pure crystals with magneto-optical methods to the low temperatures region where only old measures were available.     

微波复合直流等离子体转化天然气制乙炔的研究

利用微波复合直流等离子体对天然气转化制乙炔反应进行了研究. 考察了氢烷比、气体流量、功率等参数对装置的能量利用率以及天然气转化反应的影响, 并考核了微波复合直流等离子体转化天然气制乙炔工艺的稳定性. 实验结果表明: 微波复合直流等离子体装置的能量利用率随等离子体工作气体的流量的增加而提高; 由于微波的作用使传统直流柱状等离子体分化为多根丝状等离子体, 从而使得电极的烧蚀方式由传统的点烧蚀变为面烧蚀, 并大幅度提高等离子体转化天然气工艺的稳定性和电极寿命; 甲烷的转化率和乙炔的收率随功率的增加而提高, 随CH₄/H₂比和气体流量的增加而降低, 在氢烷比为0.9、总气体流量为760 L/min、微波源输出电功率6 kW、直流电源输出功率90 kW时, 甲烷转化率可达84.4%, 乙炔选择性为75.6%, 乙炔收率为63.8%, 乙炔能耗达10.8 kWh•kg^－1; 电极寿命超过200 h.     

Experimental study of the plasma window

The plasma window is an advanced apparatus that can work as the interface between a vacuum and a high pressure region. It can be used in many applications that need atmosphere-vacuum interface, such as a gas target, electron beam welding, synchrotron radiation and a spallation neutron source. A test bench of the plasma window is constructed in Peking University. A series of experiments and the corresponding parameter measurements have been presented in this article. The experiment result indicates the feasibility of such a facility acting as an interface between a vacuum and a high pressure region.     

Simultaneous determination of chlorpheniramine and pseudoephedrine in human plasma by liquid chromatography-tandem mass spectrometry

A sensitive and specific procedure for simultaneous quantitation of chlorpheniramine and pseudoephedrine in human plasma has been developed and validated. Analytes were extracted from plasma samples by liquid-liquid extraction, separated on a Diamonsil C18 column (250 x 4.6 mm i.d.) and detected by tandem mass spectrometry with an atmospheric pressure chemical ionization interface. Diphenhydramine was used as the internal standard. The method has a lower limit of quantitation of 0.2 and 2.0 ng/mL for chlorpheniramine and pseudoephedrine, respectively. The intra- and inter-day relative standard deviation, calculated from quality control (QC) samples were below 4.3% for chlorpheniramine and below 9.5% for pseudoephedrine. The inter-day relative error as determined from QC samples was within 4.7% for each analyte. The overall extraction recoveries of chlorpheniramine and pseudoephedrine were 77 and 61% on average, respectively. The method was successfully applied to pharmaockinetic study of chlorpheniramine and pseudoephedrine in volunteers receiving formulations containing 4 mg of chlorpheniramine maleate and 60 mg of pseudoephedrine hydrochloride.     

微波等离子体引发合成P(AMPS/NIPA)新型智能凝胶及其性能

以2-丙烯酰胺-2-甲基丙磺@（AMPS）和异丙基丙烯酰胺（NIPA）为单体,通过微波等离子体引发聚合制备了新型二元智能凝胶P（AMPS／NIPA）,并对其性能进行了研究。探讨了等离子体功率及处理时间对聚合反应的影响;研究了该凝胶的温度敏感性、吸水／失水动力学和pH敏感性及其影响因素;对凝胶的组成及三维交联网络结构进行了表征。结果表明,P（AMPS／NIPA）二元智能凝胶具有高的溶胀比、很好的温度敏感性和pH敏感性以及快的智能响应速率。     

多层膜聚光镜对Schwarzschild显微镜成像均匀性的影响

提出了利用多层膜聚光镜提高Schwarzschild显微镜成像均匀性的方法。设计了聚光镜的光学结构,使80%的等离子体辐射能量会聚在约0.8 mm直径的范围内。根据成像系统的工作波长和光线在聚光镜表面的入射角度,设计了Mo/Si周期多层膜,制备了聚光镜光学元件,膜层周期厚度为9.64 nm,周期数为30,对18.2 nm波长的峰值反射率为51.7%。利用所设计的聚光镜作为照明系统,对Schwarzschild物镜进行了网格成像实验。结果表明:在1.2 mm视场内可以实现2.5 μm的空间分辨力,并且完全消除了物镜中心遮拦所造成的像面光强分布不均匀性。