β-环糊精聚合物膜拆分氨基酸对映体

环糊精（CD）具有亲水的外围及憎水的内腔,在溶液中可与许多有机物形成包合物,并对其形状、体积与极性呈现选择性^[1]。通过化学修饰引入新的识别基团,可使CD具有更高的结合选择性,即多重分子识别^[2]。CD及其衍生物可用作气相色谱固定相、液相色谱固定相和流动相手性添加剂、毛细管电泳溶剂介质分离各种光学异构体,但作为膜分离材料来拆分手性化合物的有关报道却很少^[3]。本文将氨基取代的环糊精子分子共价键合于聚乙烯醇上,制得带有环糊精基团的聚合物膜,并用此膜拆分了某些消旋氨基酸。     

Determination of Catecholamine Concentration by Reverse-Phase Liquid Chromatography with Elecrtrochemical Detector in Plasma

The plasma catecholamine include mainly norepinephrine(NE),epinephrine(E) and dopamine (DA). The catecholamines(CA) are nervous mediator which are synthesized and release from sympathetic system. It is significant for diagnosing disease and researching surgical stress in clinic that determine the concentration of catecholamine in plasma.The analytic method had traditionally radioactive enzyme, fluorescent spectrometry and high performance liquid chromatography(HPLC). This paper describe an analytical technique that determine the concentration of NE, E and DA in plasma using HPLC-ED. The method is sensitive, fast and accuracy,and can be applied for the clinical diagnosis and laboratory research.     

Spectroelectrochemical Study on Radical Intermediate of Coenzyme Q10 at Silver Electrode

The radical intermediate (ubisemiquinone) of CoenzymeQ₁₀ (CoQ₁₀) had been observed in nonpolar solvents by spectroscopic techniques.1 The present work investigates the radical speices, as well known, it is extremely unstable in polar solvents, in ethanol/water system through spectroelectrochemical techniques including in situ UV/Vis,EPR and NMR.     

CXN天然沸石的研究Ⅰ.离子交换与结构性质表征

采用离子交换和焙烧等方法,对我国CXN天然沸石(STI型)进行改性.应用化学分析,粉末XRD,TG/DTA,~(27)Al MAS NMR,~(29)Si MAS NMR,低温N_2吸附等方法表征相关的结构、离子交换等性质.CXN沸石的晶胞组成Na_(0.2)Mg_(0.1)Ca_(8.4)[Al_(17.2)Si_(54.8)O_(144)]·65H_2O,属富钙型.经离子交换脱出Ca~(2 )后的沸石在焙烧过程中伴随有骨架脱铝,骨架的热稳定性已由原样的500℃以下提高到700℃以上.交换改性后的沸石,呈现反映该沸石微孔特性的Ⅰ型氮吸附等温线.     

First-Order-Like Transition in Inhomogeneously Broadened Two-Mode Ring Laser Gain-Noise Model

An inhomogeneously broadened two-mode ring laser gain-noise model taking account of both full saturation effects and multiplicative noise induced by gain fluctuations is investigated. By using a corresponding Fokker-Planck equation and perturbation theory proposed by Graham et al. the joint stationary distribution for light intensities is obtained. It is found that a first-order-like transition occurs when laser is operated off resonance.     

No-relationship Between Impossibility of Faster-Than-Light Quantum Communication and Distinction of Ensembles with the Same Density Matrix

It has been claimed in the literature that impossibility of faster-than-light quantum communication has an origin of indistinguishability of ensembles with the same density matrix. We show that the two concepts are not related.We argue that even with an ideal single-atom-precision measurement, it is generally impossible to produce two ensembles with exactly the same density matrix; or to produce ensembles with the same density matrix, classical communication is necessary. Hence the impossibility of faster-than-light communication does not imply the indistinguishability of ensembles with the same density matrix.     

聚丙烯酸酯类Tg的量子化学-神经网络研究

用密度泛函方法在6-31G(d)基组上优化了38种聚丙烯酸酯类的结构单元, 得到了其单元的量子化学参数, 探讨了这些参数与聚丙烯酸酯类玻璃化温度(Tg)的关系. 计算表明, 影响聚丙烯酸酯类Tg的主要因素有结构单元的侧链长度、侧链的分支数、最高占据轨道能级、极化率、偶极矩、等体积热容和热力学能等参数. 用模式识别方法(偏最小二乘法)讨论了这些参数与Tg的定性关系, 两类Tg大小不同的聚合物基本分布在不同区域, 用逐步回归和人工神经网络方法建立了这些参数与Tg的定量关系, 2种方法的预测结果与实验值的相关系数分别为0.9753、0.9985, 标准偏差分别为18.42、4.25, 预报结果与实验值基本一致.     

瓜环与长链二胺自组装实体结构考察

以^1H核磁共振技术和X射线单晶衍射分析方法考察了3种瓜环与长链二胺(1,7-庚二胺与1,8-辛二胺)相互作用的结构特征．^1H NMR分析表明瓜环(Q[6]和Q[7])与有机二胺(1,7-庚二胺与1,8-辛二胺)有较强的相互作用,形成自组装类轮烷结构;Q[8]与1,7-庚二胺与1,8-辛二胺之间相互作用力相对较弱;晶体结构测定结果表明,六元瓜环与辛二胺自组装形成的类轮烷实体中,辛二胺是以直链状穿过六元瓜环的空腔,两配位氨基留在瓜环两端口之外．     

大学物理课程思政设计与实践——以质点力学为例

在教学过程中加强课程思政教育具有重要意义、势在必行.为了深化大学物理课程教学改革,在混合式教学模式下,借鉴传统教学针对达成知识目标的有效教学方法,对课程思政进行教学设计.通过线上、线下、考核“三位一体”的思政设计与实践,结合期末课程思政名师讲座提升,初步形成课程思政育人模式.该模式应用以第一章“质点力学”为例,实践表明课程的育人质量得到提升.     

Pb(In1/2Nb1/2)O3-Pb(Ni1/3Nb2/3)O3-PbTiO3压电陶瓷的介电、铁电和压电性能

采用两步法制备了0.30Pb(In1/2 Nb1/2)O3-(0.70-x)Pb(Ni1/3Nb2/3)O3-xPbTiO3(PIN-PNN-PT,x=0.33,0.35,0.37,0.39)压电陶瓷.研究了PIN-PNN-PT压电陶瓷的相结构、介电、铁电和压电性能.研究表明位于准同型相界(MPB)的组分0.30PIN-0.33PNN-0.37PT具有最佳电学性能,其居里温度TC、压电系数d33、平面机电耦合系数kp、自由介电常数ε二介电损耗tanδ、剩余极化Pr、矫顽场EC分别为200℃、386 pC/N、50;、2692、0.045、34 μC/cm2、18 kV/cm.结果 显示PIN-PNN-PT三元系相比于PNN-PT有更高的居里温度,同时保持了优异的压电性能.