双硫腙-离子液体萃取-原子吸收光谱法测定复杂体系样品中锌

将离子液体1-丁基-3-甲基咪唑六氟磷酸盐和双硫腙螯合剂用于复杂体系样品中锌的萃取。用原子吸收光谱法测定复杂体系样品中的锌含量。选择测定波长为516nm。锌的质量浓度在0.1~2.0mg·L-1范围内与其吸光度呈线性关系,检出限(3s/k)为0.69μg·L-1。方法应用于硫酸锌口服液样品中锌的测定,测定结果与药典法测定值相符。用标准加入法对方法的回收率进行试验,测得回收率在98.5%~101%之间,测定值的相对标准偏差(n=5)在1.9%~2.8%之间。     

基于离子液体极性下苯二溴代反应选择性研究

以溴苯为原料与液溴反应,通过在极性溶剂中添加离子液体改变溶剂的极性、改变反应温度等条件,提高其邻位或对位的单一选择性。结果表明,溶剂极性增大,对位产物选择性提高,溶剂极性降低,邻位产物选择性提高。当CH2Cl2中离子液体含量为2(wt)%时,对位产物相对含量达到最大(92.02%)。     

水热法制备Pr掺杂Bi2WO6三维花状微球的光催化性能

通过水热法制备稀土Pr掺杂Bi₂WO₆三维花状微球,利用XRD、SEM、N₂吸附-脱附、紫外-可见吸收光谱和光致发光光谱对所制备的光催化材料进行表征。通过降解亚甲基蓝评价样品的光催化活性。结果表明,1.0% Pr-Bi₂WO₆样品的可见光催化活性最佳,降解率达到95%。Pr掺杂提高了催化剂的可见光吸收性能并且能够束缚光生电子使得电子空穴对有效分离从而获得强氧化物质。对其光催化降解做出了合理的解释。     

湿法刻蚀机腔室关键结构及主要工艺参数对刻蚀性能的影响因素研究

以某18英寸湿法刻蚀机腔室为研究对象,建立了流-热耦合的数值分析模型,研究了刻蚀过程中工艺气体在圆筒式腔室内流速、压强、温度的分布规律,结合HF酸在乙醇环境下刻蚀SiO2的工艺原理,提出了由耗散系数、物质转换系数、物质量通量、品格结构等表征的刻蚀速率及刻蚀不均匀性评价方法,得到了腔室关键结构及主要工艺的参数对刻蚀性能的影响规律.     

采用硅离子注入改进SIMOX埋氧的抗总剂量辐射性能研究

采用硅离子注入工艺对注氧隔离(SIMOX)的绝缘体上硅(SOI)材料进行改性, 在改性材料和标准SIMOX材料上制作了部分耗尽环型栅NMOS/SOI晶体管, 并对其进行⁶⁰Co γ射线总剂量辐照试验. 通过背栅的I-V特性表征晶体管的总剂量辐照特性. 结果表明, 在埋氧层注硅可以降低NMOS/SOI受辐照引起的背栅阈值电压漂移, 提高埋氧层的抗总剂量能力.     

光学干涉在二次电光系数测量中的应用与分析

为了更加深入地掌握光学干涉原理以及晶体材料的电光效应,我们搭建了利用干涉原理的典型光学系统——马赫-曾德尔电光系数干涉测量系统.首先,结合光学干涉原理和晶体材料的二次电光效应,进行了详细的理论推导,证明了测量方法的正确性和可行性.之后,以钽铌酸钾钠(KNTN)晶体作为研究对象,在实验中测量得到了其二次电光系数s11为2.28×10-15 m2·V-2.在此过程中,通过对马赫-曾德尔光学干涉测量系统的理论剖析与实际应用,相信可以帮助同学们更深入地理解和掌握光学干涉、晶体折射率及其电光效应的本质与原理.     

Total dose radiation effects on SOI NMOS transistors with different layouts

Partially-depleted Silicon-On-Insulator Negative Channel Metal Oxide Semiconductor (SOI NMOS) transistors with different layouts are fabricated on radiation hard Separation by IMplanted OXygen (SIMOX) substrate and tested using 10keV X-ray radiation sources. The radiation performance is characterized by transistor threshold voltage shift and transistor leakage currents as a function of the total dose up to 2.0×10⁶ rad(Si). The results show that the total dose radiation effects on NMOS devices are very sensitive to their layout structures.     

LAMOST medium-resolution spectroscopic survey of binarity and exotic star (LAMOST-MRS-B): Observation strategy and target selection

LAMOST-MRS-B is one of the sub-surveys of LAMOST medium-resolution ($R\sim7500$) spectroscopic survey. It aims at studying the statistical properties (e.g., binary fraction, orbital period distribution, mass ratio distribution) of binary stars and exotic stars. We intend to observe about 30000 stars ($10 {\rm mag}\leq G < 14.5$ mag) with at least 10 visits in five years. We first planned to observe 25 plates around the galactic plane in 2018. Then the plates were reduced to 12 in 2019 because of the limitation of observation. At the same time, two new plates located at the high galactic latitude were added to explore binary properties influenced by the different environments. In this survey project, we set the identified exotic and low-metallicity stars with the highest observation priorities. For the rest of the selected stars, we gave the higher priority to the relatively brighter stars in order to obtain high quality spectra as many as possible. Spectra of 49129 stars have been obtained in LAMOST-MRS-B field and released in DR8, of which 28828 and 3375 stars have been visited more than twice and ten times with $\rm SNR \geq 10$, respectively. Most of the sources are B-, A-, and F-type stars with $\rm -0.6< [Fe/H] < 0.4 $ dex. We also obtain 347 identified variable and exotic stars and about 250 stars with $\rm [Fe/H] <-1$ dex. We measure radial velocities (RVs) by using 892233 spectra of the stars. The uncertainties of RV achieve about $1$ ${\rm km \cdot s^{-1}}$and $10$ ${\rm km \cdot s^{-1}}$ for 95% of late- and early-type stars, respectively. The datasets presented in this paper are available at http://www.doi.org/10.57760/sciencedb.j00113.00035.