高效液相色谱法测定山生柳中酚苷类成分的含量

用高效液相色谱法测定山生柳中水杨苷、水杨酰水杨苷和木犀草素07－O－葡萄糖苷的含量，流动相为1．5％醋酸溶液－甲醇，Symmetry C18柱，柱温30℃，流速1．1mL/min，检测波长270nm，线性浓度范围分别为527．0－105．4um/mL,140-28.0ug/mL,81.0-16.2ug/mL，平均回收率是104．9％和103．6％，RSD分别为2．0％，0．3％和0．3％。     

薄层色谱法同时分析植物材料中的维生素Bl、B2、B6

随着野生资源的开发利用和营养食品的广泛研究,提供多种维生素的快速、简便、高灵敏度的同时分析方法日益重要。液相色谱法有效地同时测定过医用多维片中的多种水溶性维生素,还只报道过谷物和强化食品中VB_1、VB_2的同时分析。薄层色谱法曾用于多维医药制品中水溶性维生素的分离、检测,但灵敏度不高,未见同时测定过天然材料中的微量水溶性维生素。本文采用胶束增溶技术,在薄层色谱法中引入高灵敏的萤光分析法,同时分析了植物材料中的VB_1、VB_2和VB_(?),检出限分别达0.01μg和0.04μg。     

超高效液相色谱-三重四级杆串联质谱法同时测定植物组织中多种激素

建立了同时测定植物组织中玉米素(ZT)、吲哚乙酸(IAA)、赤霉素类(GA1、GA3、GA4)、脱落酸(ABA)、茉莉酸(JA)7种植物激素的超高效液相色谱-三重四级杆串联质谱法(UHPLC-QqQ-MS/MS)。采用C18色谱柱(50×2.1mm,1.8μm)分离,以甲醇-0.1%甲酸水溶液为流动相,梯度洗脱,在多反应监测(MRM)模式下进行定性定量分析,外标法定量。7种植物激素的检出限为0.01~8.77ng·mL~(-1),定量限为0.02~29.23ng·mL~(-1),在实验所采用的浓度范围内线性相关系数(R2)在0.9870~0.9990之间。植物样本前处理采用C18-SPE小柱进行富集和纯化,极大地减少了基质干扰。在辣椒叶片基质中,7种植物激素在低、中、高3个加标水平下的平均回收率为65.8%~90.9%,相对标准偏差(RSDs,n=5)为2.1%~5.5%。该方法简单、快速,灵敏,准确,适用于对植物组织中多种激素的同时测定。     

Effects of Thickness and Polarization Field on the Photovoltaic Properties of BiFeO3 Thin Films

We study the effects of film thickness on lattice parameters, direct band gap and photovoltaic outputs in the sol-gel derived BiFeO3 thin films. With the change of the film thickness, the great transitions will take place in the preferred orientation and lattice parameters. Furthermore, the photovoltaic outputs are significantly dependent on the film thickness. The results show that the open circuit voltage gradually increases and the short circuit current reciprocally decreases with the increase of film thickness. In particular, we demonstrate for the first time that there are tunable photovoltaic outputs with external electric field polarization switching in the polycrystalline BiFeO3 film, which is critical for the future device applications based on the photovoltaic properties of BiFeO3 films.     

基于累积前景理论与PGSA的应急响应群决策模型

针对区间概率条件下的突发事件应急响应群决策问题,考虑决策者的心理行为特征,提出了基于累积前景理论和模拟植物生长算法的决策模型.首先,根据人员伤亡和财产损失的损益值计算突发事件情景的综合价值,其次,基于累积前景理论计算各应急方案的累积前景值.然后,构建了以各决策者信息与群体集结信息之间距离最小为目标的非线性规划模型,采用模拟植物生长算法获得群体最优集结信息.最后,通过案例验证模型的有效性和可行性.     

Bonn-Gatchina partial wave analysis

The present status of the Bonn-Gatchina partial wave analysis of the photoproduction and pion induced data is presented. An observation of signals which can be associated with new baryon resonances and possible interpretations of the baryon spectrum is discussed.     

Hadro- and photo-production of η′ in quasi-free proton and neutron processes

The η′ photoproduction process on quasi-free proton and neutron and the reaction NN→ η′NN are investigated within a relativistic effective Lagrangian approach to hadronic interactions. Resonances with spins 1/2 and 3/2 are considered together with the nucleonic and t-channel meson-exchange current contributions. In photoproduction processes, the S11 resonance is found to be responsible for the sharp rise of the cross sections near threshold. In pp → η′pp, it is found that the S11 resonance dominates the total cross section over the entire energy region considered. The spin observables, in particular the beam and target asymmetries, are shown to be very sensitive to the reaction mechanism and will help impose more stringent constraints on the model parameters.     

反相高效液相色谱法测定植物钩藤中钩藤碱含量

反相高效液相色谱法测定植物钩藤中钩藤碱含量;钩藤;钩藤碱;高效液相色谱法     

基于光谱技术的植物叶绿素浓度无损检测仪器的研制

开发了一种便携式植物叶绿素无损检测仪器,该仪器可实现对叶绿素浓度的实时、快速、无损检测。仪器主要包括4个部分：叶片夹具,光源驱动电路,光电检测及信号调理电路和微控制系统。提出了一种电流可调节的光源恒流驱动电路方案,在实现恒流驱动的同时还可以对驱动电流进行程控。同时提出了一种一体化叶片夹具设计方案,不仅简化了仪器的光学结构,而且提高了仪器稳定性。在仪器的标定实验中,用SPAD-502叶绿素测量仪测定的叶片叶绿素含量SPAD值作为标准值,建立了多元线性标定模型,对仪器的性能进行了评价,叶绿素预测值与标准值的相关系数为0.97,预测均方根误差为1.3 SPAD,仪器重复性的均方根误差为0.1 SPAD。标定实验结果表明,该仪器测量精度高、性能稳定。