LS-971脱氧保护型硫磺回收催化剂的制备及表征

介绍了LS-971脱氧保护型硫磺回收催化剂的制备及表征研究,主要对催化剂的载体、活性组分及助催化剂进行了筛选及分析表征,并与进口催化剂进行了对比.结果表明LS-971脱氧保护型硫磺回收催化剂的性能达到了国外同类催化剂水平.     

回转机械扭振测量技术研究

本文设计出一种宽带扫描激光多普勒扭振测量仪,由于使用了宽带扫描技术,从而使得系统具有测量动态范围大、测量精度高、实时快速等特点.     

流动注射化学发光抑制法测定抗坏血酸

基于抗坏血酸对Ｌｕｍｉｎｏｌ－ＫＩＯ４－Ｈ２Ｏ２体系化学发光反应的抑制作用,建立了化学发光抑制快速测定抗坏血酸的新方法。该方法线性范围为１．０＊１０＾－７－１．０＊１０＾－５ｍｏｌ／Ｌ,检出限为６．０＊１０＾－８ｍｏｌ／Ｌ,对８．０＊１０＾－７ｍｏｌ／Ｌ抗坏血酸１１次平行测定的相对标准偏差为１．０％。用于维生素Ｃ片剂及注射液中抗坏血酸含量的测定,结果令人满意。     

同时测定水中阴、阳离子的单柱阴离子排斥-阳离子交换色谱法

采用单柱离子色谱系统和电导检测的方法,以丙二酸为淋洗液,同时有效地分离、检测了溶液中SO42-、Cl -、NO3-、F -、Na 、NH4 、K 、Mg2 、Ca2 9种离子。研究了丙二酸浓度和流速对各离子保留时间及电导检测行为的影响。该法用于目前市售饮用水中的阴阳离子分析 ,得到满意的结果     

基于石墨烯的真菌毒素检测方法研究进展

近年来,二维纳米材料石墨烯成为生物毒素检测领域的研究热点。该文对真菌毒素的检测现状作了简要介绍,对基于该类纳米材料的真菌毒素检测技术研究进行综述,并展望了真菌毒素检测技术发展的新趋势。     

硫酸铜掺杂TiO2涂层对碳纤维抗氧化性能的影响

采用溶胶-浸渍法,以CuSO₄为烧结助剂在碳纤维表面制得TiO₂涂层。利用XRD、SEM和TEM分析了涂层相组成及形貌,通过静态等温氧化实验考察了涂层碳纤维抗氧化性能。结果表明:掺杂CuSO₄制备TiO₂涂层均匀完整致密,涂层相组成均为锐钛矿型TiO₂,且涂层厚度从45nm提高至185nm;与普通TiO₂涂层碳纤维相比,完全氧化温度从667℃上升到800℃,氧化活化能从118.390kJ·mol^-1提高到152.562kJ·mol^-1,CuSO₄的掺杂大大提高了TiO₂涂层碳纤维的抗氧化性能。     

Generation of domain-wall solitons in an anomalous dispersion fiber ring laser

We report experimental observations performed using a net anomalous dispersion Er-doped fiber ring laser without polarization-selective elements, highlighting the domain-wall solitary pulses generated under the incoherent polarization coupling. By adjusting the pump power and the polarization state appropriately, bright and dark solitons can stably co-exist in the cavity, both centered at 1562.16 nm with a 3-dB spectral width of ～ 0.15 nm and a repetition rate of 3.83 MHz. Moreover, the 0.8 mm long thulium-doped fiber (TDF) facilitated the mode-locking and self-starting of the laser. This is the first demonstration of a laser being used to generate bright and dark solitons synchronously while using TDF as the saturable absorber (SA). Except possessing the all-fiber structure, the laser exhibits good stability, which may have a significant influence on improvement of the pulse-laser design, and may broaden practical applications in optical sensing, optical communication, and soliton multiplexed systems.     

Statistical potentials for 3D structure evaluation:From proteins to RNAs

Structure evaluation is critical to in silico 3-dimensional structure predictions for biomacromolecules such as proteins and RNAs.For proteins,structure evaluation has been paid attention over three decades along with protein folding problem,and statistical potentials have been shown to be effective and efficient in protein structure prediction and evaluation.In recent two decades,RNA folding problem has attracted much attention and several statistical potentials have been developed for RNA structure evaluation,partially with the aid of the progress in protein structure prediction.In this review,we will firstly give a brief overview on the existing statistical potentials for protein structure evaluation.Afterwards,we will introduce the recently developed statistical potentials for RNA structure evaluation.Finally,we will emphasize the perspective on developing new statistical potentials for RNAs in the near future.     

混合萃取剂-悬浮固化分散液相微萃取测定尿中的苯巯基尿酸

建立了混合萃取剂-悬浮固化分散液相微萃取联合高效液相色谱测定尿中苯巯基尿酸(S-phenylmer-capturic acid,SPMA)的方法。优化了微萃取的实验条件,取20 mL尿样并调节至pH 2.0,加入7.2 g固体NaCl,并振荡溶解;以100μL十二醇-三氯甲烷(1.8∶1,V/V)混合溶剂作为萃取剂,100μL甲醇作为分散剂,振摇使萃取剂分散于样液中;离心使萃取剂悬浮于样品溶液表面,"20℃冷冻至有机相凝固,转移凝固的萃取剂至EP管,室温下融化,离心后取上清液进样分析。苯巯基尿酸在0.025～1.25 mg/L浓度范围内线性良好,方法检出限为0.019 mg/L,日内精密度与日间精密度分别为2.2%～5.4%和2.5%～6.1%,将方法用于实际尿样的分析,取得了较满意的结果,加标回收率在86.8%～99.9%之间。本方法简便快捷、适合尿样批量分析。