Viscous Shock Wave to an Inflow Problem for Compressible Viscous Gas with Large Density Oscillations

Acta Mathematicae Applicatae Sinica, English Series - This paper is concerned with the inflow problem for one-dimensional compressible Navier-Stokes equations. For such a problem, Huang, Matsumura,...     

水产品中硝基呋喃代谢物残留快速检测新方法的研究

采用超高效液相色谱-串联质谱检测系统(UPLC-MS/MS)研究了2种衍生剂、2种衍生时间对水产品中4种硝基呋喃代谢物3-氨基-2-唑烷基酮(AOZ)、5-甲基吗啉-3-氨基-2-唑烷基酮(AMOZ)、氨基脲(SEM)、1-氨基-乙丙酰脲(AHD)的衍生化反应机理、衍生产物的检测灵敏度及其稳定性.质谱扫描结果表明,衍生剂2-氯苯甲醛和2-硝基苯甲醛对4种硝基呋喃代谢物的衍生化反应遵循相同的亲核加成反应机理;方差分析结果表明,同一衍生剂和同一代谢物,快速衍生化2 h和连续衍生化16 h获得的衍生产物的检测灵敏度没有显著差别;所有快速衍生物检测灵敏度连续4 d保持相对稳定.初步研究了快速水解对阳性样品的有效性.     

Optimal convergence rates for three-dimensional turbulent flow equations

In this paper,the convergence rates of solutions to the three-dimensional turbulent flow equations are considered.By combining the Lp-Lq estimate for the linearized equations and an elaborate energy method,the convergence rates are obtained in various norms for the solution to the equilibrium state in the whole space when the initial perturbation of the equilibrium state is small in the H3-framework.More precisely,the optimal convergence rates of the solutions and their first-order derivatives in the L2-norm are obtained when the Lp-norm of the perturbation is bounded for some p ∈[1,6/5).     

高效液相色谱法检测水产品中硝基呋喃类代谢物残留量

建立了水产品中硝基呋喃类代谢物残留量测定的样品处理方法和高效液相色谱分析方法.样品经酸解、2.氯苯甲醛衍生后用乙酸乙酯萃取、SPE柱净化,经高效液相-紫外检测器测定.本方法4种硝基呋喃类代谢物的定量限均为1.0μg/kg,在5.0～500μg/L质量浓度范围内,4种硝基呋喃类代谢物的工作曲线均呈良好线性,在2个添加浓度水平的平均回收率为76%～102%,相对标准偏差均小于10%(n=6).该方法适用于定性定量水产品中硝基呋喃类代谢物的残留分析.     

超高效液相色谱串联质谱法快速检测烤鳗虾中硝基呋喃代谢物残留新技术

采用高检测灵敏度超高效液相色谱串联质谱开发了烤鳗虾中硝基呋喃代谢物残留量快速检测新技术.该技术包括2-氯苯甲醛为衍生剂,试剂盒方法快速样品制备,高检测灵敏度超高效液相色谱串联质谱快速测定.设计了4个添加水平(0.2、0.5、1.0、2.0 μg/kg)、8次重复的试验.结果表明,方法线性范围0～5.0 μg/kg;检测限均为0.2μg/kg;AOZ回收率89.2%～100.6%,RSD2.2%～12.6%;AMOZ回收率91.3%～107.4%,RSD 4.3%～8.7%;SEM回收率79.9%～118.0%,RSD 2.4%～12.3%和A皿回收率78.9%～105.0%,RSD3.7%～12.1%.该快速检测方法小批量(20个样品)检测周期少于5.5h.     

Quantum Dialogue Based on Hypertanglement Against Collective Noise

The major problem faced by photons propagating through a physical channel is that of collective noise. This collective noise has the ability to reduce the number of quantum bits that are transmitted, thereby reduces the message fidelity. The traditional method of noise immunity is the use of entanglement purification, which consumes a lot of quantum resources in accomplishing the joint probability of noise immunity but does not guarantee accurate quantum dialog. In this paper, we investigate a new approach to quantum dialogue in which quantum information can be faithfully transmitted via a noisy channel. we constructs corresponding Decoherence Free Subspace(DFS), the quantum state after the change is in the maximally entangled state, so as to realize the fidelity of quantum dialogue model that can ensure the accuracy and noise resistance, and secret information exchange.