EMG模型参数间的联系

通过色谱拖尾峰EMG数学模型的计算机数值计算, 建立了拖尾峰特征参数之间的三类不同性质的线性关系, 佐证并修正了一些经验公式, 提出了计算模型参数与保留时间之间线性关系的新方法。     

循环伏安法研究金属铅在硫酸溶液中形成PbO~2的过程

测取了硫酸浓度为0.5～5.1mol.dm^-^3、扫描速度为1～70mV/s的铅的循环伏安曲线.得到两个PbO~2形成峰I和II,相应地假设为PbO和PbSO~4的氧化.在较低的扫描速度下以及稀硫酸溶液中,峰值电位ψpI与扫描速度S几乎无关,峰值电流ipI近似地与(S)^1/2呈直线关系,并与PbSO~4在硫酸溶液中的溶解度相应,所以过程可能受Pb^2+离子在表面膜孔隙内的扩散所控制.在较高的扫描速度下,δψpi/δlogS=50mV,属于不可逆过程,对于峰II PbSO~4的氧化过程也进行了初步讨论.     

焦磷酸盐水溶液中稳定Pr(IV)和Tb(IV)的研究

本文报道了在焦磷酸盐的碱性水溶液中用O~3氧化Pr(III)和Tb(III),从而得到Pr(IV)-P~2O~7^4^-和Tb(IV)-P~2O~7^4^-的配合物溶液,通过对溶液进行化学分析及吸收光谱的研究,证明了溶液中有Pr(IV)和Tb(IV)的存在,其持征吸收分别为λmax=365nm,摩尔消光系数ε=1205L/mol.cm;/.pr(iv)=257nm,ε=929L/mol.cm.在碱性条件下,Pr(IV)和Tb(IV)的还原反应均为拟一级反应.用动力学方法测定了不同条件下Pr(IV)和Tb(IV)的还原速率常数和半衰期,从而探讨了稳定Pr(IV)和Tb(IV)的条件.同时还测定了在反应条件下Pr(IV)/Pr(III)和Tb(IV)/Tb(III)电对的克式电位。     

OBSERVATION OF ENERGY DISSIPATION PEAK IN POLYSTYRENE MELT ABOVE Tg

In this paper two different kinds of dynamic mechanical techniques(inversed torsion pendulum and energy dissipation apparatus)were used to study the dynamic behavior of atactic monodisperse polystyrene above glass transition. The plots of energy dissipation versus temperature were presented for two atactic polystyrene samples.An apparent energy dissipation peak occurred above T_g in each plot measured by the inversed torsion pendulum,and simultaneously the sample was found to flow assuredly at the moment.To exclude the influence of the flow and demonstrate there was a peak indeed above T_g,the energy dissipation apparatus was used,in which the samples were put into a cup.An obvious peak appeared, and it was in agreement with the peak observed by the inversed torsion pendulum.On basis of the results measured by the two kinds of apparatus,a conclusion is drawn that a peak occurrs above T_g,which gives a manifestation for the existence of the liquid-liquid transition.     

Paper-based diagnostic platforms and devices

Paper-based analytical devices have become lately “must have” components in equipment and instrumental designed for point-of-care applications, especially when they are used in tandem with microfluidic platforms. Nowadays, paper-based electrochemical devices (PEDs) represent the first choice in the development of lab-on-a-chip biosensors because of their benefits in biomedical diagnosis in terms of simplicity, affordability, portability, and disposability. Moreover, cellulose is a biodegradable and biocompatible substrate, ideal for building disposable devices for use in remote locations or low-resource settings. Despite their low costs and simplicity, PEDs must face a tough challenge—meeting the affordable, sensitive, specific, user-friendly, rapid and robust, equipment-free, and deliverable to end users criteria. The latest achievements in microfluidic PEDs for clinical diagnosis will be critically discussed, putting emphasis on innovative assay formats and methods for surface modification.     

羰基铁-硫醇-三乙胺反应体系的研究, μ-酰基与μ-烯基铁硫配合物的合成系脱羰反应动力学

本文由反式巴豆酰氯与活性中间物[(μ-CO)(μ-R1S)Fe2(CO)6]ˉEt3N^+反应, 合成了两个新的μ-酰基铁硫配合物(μ-R1S)(μ-CH5CH=CHCO)Fe2(CO)6(R1=Et, Bu^t)和三个新的μ-烯基铁硫配合物(μ-R1S)(μ-CH3CH=CH)Fe2(CO)6(R1=Et, Bu^+, CH2=CHCH2), 此外还研究了μ-酰基配合物脱羰生成μ-烯基配合物的反应动力学, 证明为一级反应, 并求得在一定条件下的速率常数和半衰期。     

ON THE SEPARATION PROPERTY OF SYMMETRIC ORDINARY SECOND-ORDER DIFFERENTIAL EXPRESSIONS

A 1-variable calculus type argument is used to show that, for a function f : R ² → R, if for all (a, b) ? R ² we have that f o c is smooth for every smooth curve c : R → R ² nonsingular except at 0 and with c(0) = (a, b), then f is smooth. This strengthens Boman's theorem. In fact, we use an even more special collection of smooth curves to prove Boman's theorem. It is shown using a related special collection of smooth curves how the upper half cone can be viewed largely as a model for polar coordinates. Our proof here shows how the use of Frölicher spaces can reduce questions in several dimensions to those of one real variable.