Hg~(2+)荧光传感器的设计及合成(英文)

设计合成了一种新颖的基于萘荧光基团的Hg2+荧光传感器.通过荧光光谱滴定实验研究了其对Hg2+、Li+、Na+、K+、Zn2+、Co2+、Ni 2+、Cu2+、Fe2+、Mn2+、Cr3+和Fe3+等金属离子的选择性识别能力.结果表明,该传感器在生理pH=7.4的H2O-DMSO中对Hg2+表现出较高的选择性,并且形成1∶1的配合物;主客体相互作用荧光猝灭的络合常数为(9.07±0.41)×104.     

SLANT IMMERSIONS OF COMPLEX SPACE FORMS AND CHEN＇S INEQUALITY

A submanifold in a complex space form is called slant it it has constant Wirtinger angles. B, Y, Chen and Y. Tazawa proved that there do not exist minimal proper slant surfaces in CP^2 and CH^2. So it seems that the slant immersion has some interesting properties. The authors have great interest to consider slant immersions satisfying some additional conditions, such as unfull first normal bundles or Chen‘s equality holding. They prove that there do not exist n-dimensional Kaehlerian slant immersion sin CP^n and CH^n with unfull first normal bundles. Next, it is seen that every Kaehlerian slant submanifold satisfying an equality of Chen is minimal which is similar to that of Lagrangian immersions. But in contrast, it is shown that a large class of slant immersions do not exist thoroughly. Finally, they give an application of Chen‘s inequality to general slant immersions in a complex projective space, which generalizes a result of Chen.     

苦参生物成碱的二维核磁共振谱(2D-NMR)研究Ⅰ.中国东北产苦参中的N-甲基金雀儿碱与氧化槐根碱的2D-NMR研究

由我国东北产的苦参中分离出七种生物碱。由MS、IR及2D-NMR鉴定为:(+)-苦参碱、(+)-氧化苦参碱、5α-羟基苦参碱、N-甲基金雀儿碱、9α-羟基苦参碱及氧化槐根碱。另一个生物碱(6)的化学结构尚在鉴定之中。本课题采用了二种2D-NMR技术,H-H相关谱(300、400及500MHz)及C-H相关谱(H:300MHz;C:75MHz)。先发表其中两个生物碱的2D-NMR,其它将陆续发表。     

凹简型弯张式低频发射换能器

本文介绍了一种低频发射换能器[1],它结构上与Ⅰ型弯曲伸张换能器有相似之处,但呈凹简形状,具有频率低、功率大、尺寸小、重量轻等诸多优点,且其独特的外型结构适合于组排基阵,有较好的应用前景.我们研制了大小两个该型换能器,其外型尺寸分别为Ф186mm×330mm和Ф130mm×250mm;谐振频率分别为855Hz和1050Hz;声源级分别为195.7dB和191.0dB.     

均相稀土催化配位聚合反应的特征与催化剂的结构及其生成机理

本文着重介绍了均相稀土配位催化剂的结构与能够产生顺式-1,4和反式-1,4双烯烃聚合物的催化剂活性中心的生成机理。     

Energy levels and transition data of 3p63d8 and 3p53d9 configurations in Fe-like ions (Z = 57, 60, 62, 64, 65)

Atomic data of highly charged ions (HCIs) offer an attractive means for plasma diagnostic and stars identification, and the investigations on atomic data are highly desirable. Herein, based on the fully relativistic multi-configuration Dirac-Hartree-Fock (MCDHF) method, we have performed calculations of the fine-structure energy levels, wavelengths, transition rates, oscillator strengths, and line strengths for the lowest 21 states of 3p⁶3d⁸-3p⁵3d⁹ electric dipole (E1) transitions configurations in Fe-like ions (Z = 57, 60, 62, 64, 65). The correlation effects of valence-valence (VV) and core-valence (CV) electrons were systematically considered. In addition, we have taken into account transverse-photon (Breit) interaction and quantum electrodynamics (QED) corrections to treat accurately the atomic state wave functions in the final relativistic configuration interaction (RCI) calculations. Our calculated energy levels and transition wavelengths are in excellent agreement with the available experimental and theoretical results. Most importantly, we predicted some new transition parameters that have not yet been reported. These data would further provide critical insights into better analyzing the physical processes of various astrophysical plasmas.     

几种杀螨剂对三种叶螨的毒力测定

本文测定了３种杀螨剂对３种叶螨成螨的毒力。ＩＣ５０显示：３种杀螨剂毒力强弱为螨克＞三氯杀螨醇＞蚧螨灵：３种成螨的敏感性高低为柏小爪螨＞石榴小爪螨＞柑桔全爪螨。     

气相色谱-负化学电离源-飞行时间质谱测定烟草中有机氯农药残留

采用QuEChERS前处理方法,建立了气相色谱-负化学电离源-飞行时间质谱(GC-NCI-TOF-MS)检测烟草中10种有机氯农药残留的分析方法。样品采用乙酸乙酯-正己烷(1 : 1, v/v)溶液提取,提取液经N-丙基乙二胺(PSA)、无水硫酸镁分散固相萃取净化,用GC-NCI-TOF-MS检测分析。根据有机氯化合物特征离子的精确质量数、同位素离子峰簇、碎片离子丰度比和保留时间对目标物定性鉴定,外标法定量。10种有机氯农药的线性关系良好,相关系数 (r²)均大于0.997;相对标准偏差小于6.5%;检出限为0.04~0.80 μ g/kg;加标回收率为77.2%~93.0%。该方法简单快速、灵敏度高、准确性好,适用于烟草中有机氯农药残留的定性分析和定量检测。     

改进的多元醇法制备高分散纳米氧化镁及其锶吸附性能研究

以六水合氯化镁(MgCl·6H2O)为原料,以尿素为沉淀剂,采用改进的多元醇法制备了颗粒均匀、分散性好的纳米氧化镁粒子,并分别研究了反应温度和反应时间对前驱体和MgO粉体结构和形貌的影响.研究表明,在110℃反应8h后制备的前驱体为30 nm左右纳米颗粒状碱式碳酸镁Mg5 (CO3)4(OH)2(H2O)4.在700℃焙烧3h后可得到粒径为50 nm左右分散性较好的MgO纳米粒子.该种纳米氧化镁粉体对水溶液中的锶具有较好的吸附作用,吸附量为5.3 mg/g.