2018年毛细管电泳技术年度回顾

本文归纳总结了ISI Web of Science中检索的2018年度毛细管电泳（CE）技术相关的研究论文，并从生命科学研究、药物分析、手性拆分、医学及临床检验、CE相关仪器改进、食品安全检验和环境监测7个方面进行分类说明；介绍了2018年度涉及CE技术的8个会议情况；补充了国内外现行的CE技术标准。最后，列出了主要的国产毛细管电泳仪型号。     

The branching ratio for K−p → Λγ at rest

The reaction K^?p → Λγ, produced by K^? stopping in a liquid hydrogen target, has been studied using a NaI(Tl) gamma-ray spectrometer. The branching ratio is

$\text{K}{}^{\mathrm{?}}\text{p}\text{→Λγ}\text{K}{}^{\mathrm{?}}\text{p}\text{→}\text{anything}\text{=(2.8±0.8)×10}{}^{\mathrm{?3}}$

based on 1355 events assigned to this branch. This is in conflict with a previous experiment, but agrees with one of the two published calculations, when recent values for the coupling constants and scattering amplitudes are used.     

Multifractality and high energy multiparticle production

The multifractal behaviours of the various types of high energy collisions are analyzed using the normalized factorial moments which are calculated from the experimental data. Thef() curves for the various types of collision are constructed. The width of thef() curves seems to indicate roughly degree of intermittency or fluctuation of the data. The width of the curves also does not seem to be affected by the energy.     

Propagation properties and M2 factors of a vortex Airy beam

We investigate the propagation properties and M² factor of a vortex Airy beam. The expression of M² factor as a function of the modulation parameters a_x and a_y is analytically obtained. The results indicate that the M² factor can achieve minimum M²=2.33 when a_x=a_y=1.026 for the m=1st order vortex Airy beam. For m=2, the M² factor can achieve minimum M²=7.53 when a_x=1.601 and a_y=0.529 (or a_y=1.601 and a_x=0.529). These results indicate that the far field divergence of the beam width in the sense of root-mean-square beam is related to modulation parameters a_x and a_y, and increases with increasing vortex order. Numerical calculations provide an intuitive physical picture for the effect of the modulation parameters on the propagation of the vortex Airy beam.     

Surface and interface properties of carbon fiber composites under cyclical aging

Carbon fiber-reinforced BMI composites have been subjected to combination accelerated aging comprising a hygrothermal process, a thermal-oxidative process, and a freezing process in order to simulate their responses under complicated service environments. This cyclical condition, including the freezing process, has not been investigated by other researchers so far. The effects of this combination accelerated aging on the mechanical properties have been characterized by FTIR, SEM/EDXA, XRD, and moisture-uptake determination. The results indicated that combination accelerated aging had great effects on the mechanical properties of the composite, the network structure of the BMI matrix, and the moisture uptake by the composite. After a third cycle of accelerated aging, moisture reached the center layer of the composite and as a result led to an obvious decrease in ILSS due to deterioration of the carbon fiber-BMI interface. Sufficient moisture absorption on the composite surface made the network structure of the BMI matrix more open, which facilitated stress relaxation and the creation of micro-cracks, with a consequent obvious decrease in flexural strength. With increasing number of combined-action accelerated aging cycles, ever more moisture was absorbed during each hygrothermal process due to the plasticizing effect of water, and micro-cracks propagated as a result of internal stresses caused by the hygrothermal process, the thermal-oxidative process, and the freezing process of each cycle. XRD analysis indicated that moisture penetrated through the amorphous region of the BMI matrix.     

亲水梳状环氧聚合物载体柔性固定化脂肪酶

以氯乙酰化聚苯乙烯微球载体为大分子引发剂,以甲基丙烯酸缩水甘油酯和亲水性丙烯酰胺为共聚接枝单体,以氯化亚铜及2,2'-联吡啶为催化体系,采用原子转移自由基聚合法接枝合成了具有柔性链的亲水梳状环氧聚合物载体PS-acyl-P(AM-co-GMA),并将其用于耐有机溶剂YCJ01脂肪酶的共价柔性固定化.结果表明,固定化酶催...     

Efficient evaluation of Casimir force in arbitrary three-dimensional geometries by integral equation methods

In this Letter, we generalized the surface integral equation method for the evaluation of Casimir force in arbitrary three-dimensional geometries. Similar to the two-dimensional case, the evaluation of the mean Maxwell stress tensor is cast into solving a series of three-dimensional scattering problems. The formulation and solution of the three-dimensional scattering problems are well-studied in classical computational electromagnetics. This Letter demonstrates that this quantum electrodynamic phenomenon can be studied using the knowledge and techniques of classical electrodynamics.     

Structure and stability of AuXe n Z (n = 1–3, Z = −1, 0, +1) clusters

We have explored the structures and stabilities of AuXe _n ^Z (n = 1–3, Z = ?1, 0, +1) cluster series at CCSD(T) theoretical level. The electron affinities and ionization potentials are correlated to the HOMO–LUMO gaps. The role of the interaction was investigated using the natural bond orbital analysis.