支流汇合-停流流动注射法测定血清中葡葡糖

本文报告了自行设计和组装的支流汇合-停流流动注射分析仪的概貌和测定葡萄糖实验条件的选定,在流速为3.1ml/min时,留存时间7.8s,停流时间30s,取样频率达70次/小时,用于测定人体血清中葡萄糖,相对偏差为-4～2%。     

基于雨课堂平台的有机化学实验翻转课堂教学模式的研究与实践

围绕学校应用型人才培养的目标，以翻转课堂理念为基础，依托雨课堂混合教学平台，对有机化学实验教学模式进行改革创新和实践，并以乙酸乙酯的制备为案例，详细阐述该教学模式的具体实施过程。结果表明，该教学模式不仅可以提高学生课前预习成效，激发了学生学习的主观能动性，而且还能促进教师利用多媒体信息技术提升教学的效率，以及有益于高素质教师团队的建设。     

电子、正电子、离子等离子体尾场中被加速正电子的研究

为了研究在激光驱动的等离子体尾场中被加速正电子的动力学,使用了由电子、正电子、离子组成的等离子体,通过采用数值模拟方法得到了非对称脉冲驱动的尾波场中被加速的正电子的运动相图、动能变化,势能。数据结果表明：非对称激光脉冲驱动尾场中正电子得到很高的能量。提高等离子体中的正电子比例会使电子和正电子的加速效果减弱。在非对称激光脉冲驱动的激光尾场中,为了有效地加速正电子,要选择恰当的上升激光脉冲长度和下降激光脉冲长度。     

Effects of Ions Charge-Mass Ratio on Energy and Energy Spread of Accelerated Ions in Laser Driven Plasma

Effects of ions charge-mass ratio on energy and energy spread of accelerated ions in laser driven plasma are investigated in detail by proposing a simple double-layer model for a foil target driven by an ultrastrong laser. The radiation pressure acceleration mechanism plays an important role on the studied problem. For the ions near the plasma mirror, i.e. electrons layer, the dependence of ions energy on their charge-mass ratio is derived theoretically. It is found that the larger the charge-mass ratio is, the higher the accelerated ions energy gets. For those ions far away from the layer, the dependence of energy and energy spread on ions charge-mass ratio are also obtained by numerical performance. It exhibits that, as ions charge-mass ratio increases, not only the accelerated ions energy but also the energy spread will become large.     

Electron-Positron Pair Production in a Strong Laser Field Enhanced by an Assisted High Frequency Weak Field

Electron-positron pair production in a strong laser field enhanced by an assisted high frequency weak field is investigated by solving the quantum Vlasov equation.The average and residual pair number densities are obtained for sinusoid electric field and it is found that the high frequency assisted weak field will enhance pair production significantly.There exists an optimal frequency of assisted field that makes the pair production number density get a maximum one,which is a few orders of higher than that without assisted field.We also discuss the other possible assisted fields.     

Suppression of multiple ion bunches and generation of monoenergetic ion beams in laser foil-plasma

In one-dimensional particle-in-cell simulations, this paper shows that the formation of multiple ion bunches is disadvantageous to the generation of monoenergetic ion beams and can be suppressed by choosing an optimum target thickness in the radiation pressure acceleration mechanism by a circularly polarised laser pulse. As the laser pulse becomes intense, the optimum target thickness obtained by a non-relativistic treatment is no longer adequate. Considering the relativistic Doppler-shifted pressure, it proposes a relativistic formulation to determine the optimum target thickness. The theoretical predictions agree with the simulation results well. The model is also valid for two-dimensional cases. The accelerated ion beams can be compelled to be more stable by choosing the optimum target thickness when they exhibit some unstable behaviours.     

寻找周期轨道的代数分析法

本文给出了计算一般代数型（有理分式）离散动力系统周期轨道的一种分析方法－代数分析法。这种方法的优点是将非线性求解问题转化为一个线性求解问题来处理。它不仅可以准确地确定包括稳定和不稳定周期轨道的位置，而且还可以详细了解周期轨道的产生和随参数演变的分岔特性。本文利用这种方法分析了一个四维二次非线性映射，并给出了其完整的低周期轨道的分岔曲线图。     

桤木木屑对废水中Hg~（2＋）的静态吸附

研究了未改性、HNO3改性和NaOH改性桤木木屑对水中Hg2＋的吸附特性,并探讨了Hg2＋初始浓度、吸附时间和吸附温度对吸附率的影响。结果表明,在实验条件下,3种木屑对水中Hg2＋均有较好的吸附效果,吸附率可达99%以上。其中,N aOH改性木屑的吸附效果最好,平衡吸附量为3.00μg/g。结果表明,利用N aOH改性桤木木屑制备废水中Hg2＋吸附材料具有很好的应用前景。     

成都金沙遗址古人类与古动物牙齿的FTIR与XRD分析

利用FTIR与XRD判断成都金沙遗址古人类与古动物牙齿釉质和牙本质中羟基磷灰石受埋藏环境和成岩作用的污染程度。XRD图谱结果反映牙釉质和牙本质样品中最主要成分是羟基磷灰石,但衍射峰宽,且部分重叠,表明羟基磷灰石结晶度差。所有样品FTIR图谱中H₂O和OH-的振动带显著,PO3-₄和CO2-₃主要振动带的特征峰明显,近似现代生物羟基磷灰石。表征羟基磷灰石结晶程度的PCI指数值在2.4至4.0之间,同时利用BPI指数估算的羟基磷灰石中CO2-₃含量较高, 说明样品结晶程度不高。上述结果表明,所取的金沙遗址古人类与古动物牙釉质和牙本质中羟基磷灰石受埋藏和成岩作用的污染小。