Research on photovoltaic performance of Cu2ZnSnS4 and fabrication by solution chemical method

Cu2ZnSnS4（CZTS） is pr oved to be one of the ideal photoabsortion materials in the field of thin film solar cells,owning to its abundant resources,environment friendly,fascinating optoelectronic properties and so on.The crystal structure and photovoltaic

Effect of Various Prepared Method on Catalytic Performance of Cu-Mn-Si/HZSM-5 Catalyst for CO_2 Hydrogenation

分别采用物理混和、共沉积法和超声共沉积法制备了Cu-Mn-Si/HZSM-5复合催化剂,并用XRD、BET、H2-TPR、H2-TPD和NH3-TPD等手段进行了表征,考察3种制备方法对催化剂催化加氢性能的影响。结果表明:超声共沉积法制备的Cu-Mn-Si/HZSM-5催化剂颗粒均匀、粒径小、催化性能最好。H2-TPR、H2-TPD和NH3-TPD分析表明,采用超声共沉积法制备催化剂,更能促进Cu(Ⅰ)、Cu(Ⅱ)之间的相互转换,增强了铜锰复合氧化物相互作用,有利于催化剂表面活性物种Cu+形成。同时,增强了对H2的吸附强度,使表面的酸度增强,促进了催化剂活性的提高。Cu-Mn-Si/HZSM-5 catalysts were prepared via the physical hybrid method,co-precipitation method and Ultrasonic co-precipitation method,and these catalysts were characterized by XRD,BET,H2-TPR,H2-TPDand NH3-TPD to analyse catalytic performance of the catalysts.The results showed that although sonication can not obviously change the physical structure of catalysts,it can make partical uniform and tiny,and.The results indicated that Cu-MnSi/HZSM-5 catalysts prepared by the Ultrasonic co-precipitation method had uniform grain,small grain size and the best catalytic capacity.H2-TPR,H2-TPD and NH3-TPD results suggested that it promote the creation of Cu+ on surface of catalyst and enhance the interaction of copper-manganese compound oxide so that active specie Cu are difficult to be reduced by ultrasonic co-precipitation method.At the same time,adsorption sites for H2 were increased,acidity of surface of catalyst was increased and acid sites were stronger,promoting enhancement of activity of catalyst

减阻沟槽边界层相干结构展向拓扑的分层可视化

采用高时间分辨率粒子图像测速系统(TR-PIV),分别对沟槽壁面及光滑壁面平板湍流边界层速度矢量场的时间序列进行了精细测量,并利用新象限分裂法及新条件采样与相位平均技术,在李山等人对数区结果的基础上,对光滑壁面和沟槽面湍流边界层近壁区及外区相干结构二维空间拓扑的形态进行了进一步地对比研究。结果表明:在近壁区和对数区内,与光滑壁面相比,不论喷射事件还是扫掠事件,减阻沟槽使得相干结构法向脉动强度降低最为明显,即相干结构在法向上的动量和能量交换减弱,削弱了其对湍流产生的贡献;而进入外区以后,减阻沟槽对法向脉动速度分量和展向涡量在喷射和扫掠过程中影响比内区要小,说明沟槽主要影响湍流边界层内区结构,且以..

Fine estimation of timing offset for OFDM

基于时域的帧同步估计算法在通过高斯信道和多径衰落信道时,其时间测度由于循环前缀的影响有峰值平台,难于准确的判定帧到达的时刻。文中提出了一种低复杂度的符号定时估计算法,利用简化的时间测度函数检测峰值来实现同步。分析了该算法的性能,并在各种信道中进行了性能分析,给出了了仿真结果。结果表明,该算法具有较高的精度和较低的计算复杂度。Symbol synchronization estimation based on time domain correlation is a problem of timing metric plateau in an AWGN channel and estimation error in multipath fading channel due to cyclic prefix.This paper proposes a novel low complex timing metric using a simple timing metric to achieve symbol synchronization.Performance of the algorithm is analyzed.The results show that the algorithm has high precision and low computation complexity.国家自然科学基金资助项目(60572106

明胶膜醇/水渗透汽化性能的研究

用牛骨胶制备明胶膜,用于乙醇/水混合物的渗透汽化分离研究,结果表明,该膜在常温下分离85％乙醇时运行3h便可到达稳定操作状态;料液中醇含量增大、膜的分离系数提高但通量下降;而温度升高或汽相侧真空度提高都能导致膜通量与分离系数的同时提高

福建省实验动物学学科发展研究报告

1实验动物科学概述1.1实验动物科学的概念实验动物科学(lAbOrATOry AnIMAl SCIEnCES)是以实验动物资源研究、质量控制和利用实验动物进行科学实验的一门综合性学科。在《学科分类与代码标准》(gb/T13745-1992)中,与实验动物科学有关的学科分别是“实验动物学“、“医学实验动物学“、“比较病理学“等

Study on application of statistical modeling on chromatogram-effect relation in Traditional Chinese Medicine

目的构建钩藤药材中钩藤碱、异钩藤碱、柯诺辛及柯诺辛b四种生物碱对谷氨酸酯诱导PC12细胞氧化应激抑制作用的谱-效关系模型。方法在获得钩藤药材中钩藤碱、异钩藤碱、柯诺辛及柯诺辛b四种生物碱对谷氨酸酯诱导的PC12氧化应激的抑制作用的谱-效关系基础上,利用SPSS 15.0软件进行分析,建立谱-效关系模型。结果钩藤碱和柯诺辛对PC12细胞氧化应激有显著的抑制作用,其谱-效方程为:y=44.301+0.255X1+0.356X3,经7批药材验证,谱-效关系式计算值与实际值的偏差率不超过10%。结论该谱-效关系模式可用于预测钩藤对谷氨酸酯诱导的PC12细胞氧化应激的抑制作用。Objective To establish chromatogram-effect model based on inhibitory effect of four alkaloids( rhynchophyline,isorhynchophylline,corynoxine,corynoxine B) on oxidative stress of glutamate-induced PC12 cells.Methods Based on the chromatogram-effect relation of inhibitory effect of four alkaloids on the oxidative stress of glutamate-induced PC12 cells,SPSS 15.0 was used to analyse data.Results Oxidative stress of PC12 cells was significantly inhibited by rhynchophyline and corynoxine.The spectrum efficient equation was,Y = 44.301 + 0.255X 1 + 0.356X 3( P <0.05).The deviation of predictive value and true value was no more than 10% by data validation from seven samples.Conclusions The chromatogram-effect model can be used to predict the effect of uncaria macrophylla wall against the oxidative stress of glutamate-induced PC12 cells

Application of Ionic Liquids in Extraction and Separation

室温离子液体是由正负离子组成的室温为液体的熔融盐,因其具有极低的蒸汽压、可设计性和特殊的选择溶解能力等独特的性质,使得其在萃取分离有机物及金属离子、液相微萃取和汽油柴油中脱硫及碱性氮化物等领域都有着广泛应用。综述了离子液体在萃取分离上的应用进展。Ionic substances with melting points close to room temperature were referred as room-temperature ionic liquids,which showed lots of unique properties,e.g.environmentally benign,nonvolatile,designable and were good solvents for a wide range of both organic and inorganic materials.Ionic liquids are widely used in extraction and separation processes,e.g.extraction and separation of metal ions and organic compounds,headspace liquid-phase micro extraction,removal of basic nitrogen compound from distilled diesel and desulphurization of gasoline.In this paper,the recent application of ionic liquids in extraction and separation were reviewed.教育部科学技术研究基金重点资助项目(207108

Advances in preparation of mesoporous silica nanoparticles and its use as different functional drug

近年来,有越来越多的文献报道关于介孔二氧化硅纳米粒（mesoporous silica nanoparticles,MSN）作药物载体的研究。本文结合近几年国内外的相关文献,介绍了由Mobli公司合成的M41S系列,圣巴巴拉大学合成的SBA系列,以及中空介孔二氧化硅纳米粒这3种最常见的MSN的特点及制备方法,并举例介绍了MSN作为药物速释载体的相关研究,同时从p H敏感型、热敏型、光响应型三方面介绍了MSN作为药物控释载体的研究。从相关研究结果可以看出,将MSN作为药物的载体,鉴于其独特的介孔孔径、可调节的纳米孔道结构、易于功能化修饰的表面等特点,可以实现对药物的速释、缓释及控释释放。由此可见,选择将MSN作为药物的载体具有广阔的应用前景。In the past a few years, mesoporous silica nanoparticles (MSN) have attracted more and more attention for their application in drug delivery. The recent relative literature was used for reference to introduce the characteristics and preparation of M41S series MSN (synthesized by Mobil Corporation), the SBA series MSN (synthesized by Santa Barbara University), and hollow mesoporous silica nanoparticles. Examples were presented to introduce the use of MSN as immediate drug delivery carrier. The use of MSN as controlled drug delivery carrier (CDDC) was illustrated via pH-responsive CDDC, temperature-sensitive CDDC, and light-triggered CDDC. MSN showed great properties in immediate/sustained/controlled drug delivery system, in view of their unique mesoporous pore diameter, adjustable nano-channel, and surface easily to be modified. The selection of MSN as drug carrier has a broad application prospect. ? 2017, Chinese Journal of New Drugs Co. Ltd. All right reserved.福建省科技计划重点项目（2013Y0074

Generating High-concentration Solution of Reactive Oxygen Species by Strong-field Ionization Discharge

为优化氧活性粒子(rOS)在水中的生成条件,并为rOS溶液生成装置提供优化系统参数的依据,研究了rOS质量浓度在水温、PH值、O2给气体积流量、rOS投加体积质量,以及系统气压(混溶压力)等因素作用下的变化规律。实验中,气态rOS在强电离条件下通过介质阻挡放电生成,以O3计,通过O3检测仪测定其浓度;水中rOS质量浓度采用dPd分光光度法测定,用CrS来表示。实验结果表明:水温、PH值与CrS呈极显著负相关(相关系数P0.05);CrS在水温分别为16℃与24.5℃之间、PH=6.5与PH=7.0之间、O2给气体积流量为2 l/MIn与3 l/MIn之间均为差异不显著(P>0.05),其余各水温、PH值、O2给气体积流量之间均为差异显著(PO2给气体积流量>系统气压与O2给气体积流量交互作用。To optimize the generating condition of reactive oxygen species(ROS) in solution, and to provide a reference for improving ROS preparation system, we investigated the effects of several parameters, including solution temperature, solution pH, O2 input, ROS dosages, and system pressure, on the concentration of obtained ROS solution.Gaseous ROS was generated in a strong-field ionization condition induced by under dielectric barrier discharge(DBD), and its dosage represented by O3 was measured by ozone monitor.ROS in solution was caught by DPD(N, N-diethyl-p-pHenylenediamine), which was measured by DPD spectrophotometry, and the concentration of ROS solution was denoted by CRS.According to the experiments, both water temperature and pH have significant negative correlation with CRS(relativefactor P0.05).The differences between CRS are insignificant(P>0.05) under conditions of solution temperature of 16 ℃, 20 ℃, 24.5 ℃, solution pH of 6.5 and 7.0, as well as O2 input of 2 L/min and 3 L/min(P>0.05), but they are highly significant(P<0.01) or significant(P<0.05) under other tested conditions.Moreover, CRS significantly increases with the decrease of miscibility pressure(P<0.01), and it is significantly affected by the interaction between miscibility pressure and O2 input under higher ROS dosages(P<0.01).Lower water temperature, lower pH, higher ROS dosages, and lower miscibility pressure are all beneficial to increasing the concentration of ROS(CRS), which is significantly affected by the change of several parameters including solution temperature in the lower range, pH around 7, O2 input in the range of larger amount, etc.On the condition of high ROS dosage input, CRS is influenced by miscibility pressure, O2 input, and the interaction between miscibility pressure and O2 input in a descending order.国家高技术研究发展计划(863计划)(2012AA062609); 国家科技支撑计划(2013BAC06B02); 国家杰出青年科学基金(61025001)~