APPLYING THE HOMOTOPY EQUIVALENCE TRANSFORMATION OF TOPOLOGICAL SPACE SETS TO THE TOPOLOGICAL CLASSIFICATION OF STATES AND DEFECTS IN ORDERED MEDIA

In this paper the application of homotopy equivalence transformation (HET) of topological space sets to the topological classification of states and defects in ordered media is discussed. Firstly, an argument is pres-ented about the idea that for simplifying and even working out the classification and constructing homotopy class sets into groups, it is crucial to utilize the HET. As the theoretical basis for doing this we sum up the relevant results in homotopy theory into a theorem, called the "invariance theorem for HET". Secondly, in order to favor the utilization of this theorem, several propositions on homotopy equivalence between space sets are given. Finally, the absolute and relative topological dassification of states and defects is systemtically studied. The main results obtained are embodied in eight theorems.     

高校实验教学考核模式改革探索与实践

归纳了实验教学考核模式改革的一些经验,在此基础上,针对《网络攻防技术》课程实验的考核模式进行了改革,设计了网络攻防实验考核测评指标体系,构建了网络攻防实验考核平台,提出了全过程跟踪的实验考核评价方法,取得较好的实践效果.     

Iterative and adjusting method for computing stream function and velocity potential in limited domains and convergence analysis

The stream function and the velocity potential can be easily computed by solving the Poisson equations in a unique way for the global domain.Because of the various assumptions for handling the boundary conditions,the solution is not unique when a limited domain is concerned.Therefore,it is very important to reduce or eliminate the effects caused by the uncertain boundary condition.In this paper,an iterative and adjusting method based on the Endlich iteration method is presented to compute the stream function and the velocity potential in limited domains.This method does not need an explicitly specifying boundary condition when used to obtain the effective solution,and it is proved to be successful in decomposing and reconstructing the horizontal wind field with very small errors.The convergence of the method depends on the relative value for the distances of grids in two different directions and the value of the adjusting factor.It is shown that applying the method in Arakawa grids and irregular domains can obtain the accurate vorticity and divergence and accurately decompose and reconstruct the original wind field.Hence,the iterative and adjusting method is accurate and reliable.     

衣藻性别决定及交配过程中的基因调控

阐述了单细胞绿藻衣藻（Chlamydomonas）性别相关基因及其作用机制的研究进展,其中着重介绍了位于mt基因座及少量位于常染色体上的性别相关基因,并分析了它们在营养细胞分化为正负两种交配型的配子细胞、正/负配子的交配以及合子分化的起始这3个关键步骤中的调控作用.     

有指导的正交投影技术结合斜率/截距校正法实现小试水分近红外定量模型向中试传递

针对小试制剂过程建立的近红外定量模型难以直接应用于中试或大生产过程中的问题,该文以小试和中试条件下多批次药用糊精流化床制粒过程为载体,在线采集其近红外光谱数据并测定水分含量,建立小试过程水分近红外定量模型,提出并应用有指导的正交投影技术结合斜率/截距校正的模型传递方法跨尺度预测中试样本,使中试两个测试集A和B的水分相对预测误差分别由51.04%和26.64%降至4.90%和3.99%,显著提高了模型预测的准确度。将该结果与无指导的正交投影技术结合斜率/截距校正法以及模型更新相比较,该方法能更加有效地去除待测样本光谱中的干扰信息,适用范围广,为小试建立的模型放大应用到中试甚至大生产过程提供了新方案。     

高温高压下多环有机物合成亚微米金刚石

亚微米尺寸的金刚石粉末对超精细研磨抛光而言是非常理想的磨料,但高品质亚微米尺寸金刚石粉末的合成与制备到目前为止仍面临着许多的困难和挑战。在避免使用金属触媒的情况下,以萘为前驱体在11 GPa压强、1 700℃的温度条件下成功合成了高品质亚微米尺寸的金刚石粉末。所合成的金刚石粉末具有比较高的相纯度,金刚石晶粒普遍都是晶体形态发育良好且相互独立彼此分散的自形晶。晶粒粒度的频率分布属于正偏态分布,相应的平均值、中数及众数分别为158. 1,221. 5,262. 5 nm。对数正态分布拟合中,晶粒粒度的期望值和标准偏差分别为(243. 3±4. 2) nm和(122. 3±5. 4) nm。将近96%的晶粒都分布在亚微米尺寸范围内。本工作将为高品质亚微米尺寸金刚石粉末的合成与制备提供有效途径。     

Impact of Sheath Boundary Conditions and Magnetic Flutter on Evolution and Distribution of Transient Particle and Heat Fluxes in the Edge-Localized Mode Burst by Experimental Advanced Superconducting Tokamak Simulation

To study the evolution and distribution of the transient particle and heat fluxes during the edge-localized modes(ELMs) burst on the experimental advanced superconducting tokamak(EAST), the BOUT++six-field two-fluid model with sheath boundary conditions(SBCs) and magnetic flutter terms in the parallel thermal conduction is used to simulate the evolution of the profiles and growing process of the fluxes at divertor targets. Although SBCs hardly play a role in the linear phase, in the nonlinear phase both SBCs and magnetic flutter can change the dominant toroidal mode. SBCs are able to broaden the frequency distribution of the turbulence. The magnetic flutter increases the ELM size from 2.8% to 8.4%, and it doubles the amplitudes of the radial heat and particle transport coefficients at outer midplane(OMP), at around 1.0 m~2 s~(-1). It is then able to increase the particle and heat flux at the divertor targets and to broaden the radial distribution of the parallel heat flux towards the targets.     

金属-介质-金属渔网超表面结构调控的荧光辐射：空间选择性激发和双增强

增强荧光辐射在生物成像、高灵敏探测、集成光源等方面都具有重要的应用价值.金属纳米颗粒的周围或者金属纳米结构的间隙都可以产生强的电磁场,相应的,这些结构附近的局域态密度也被极大地增强.虽然增强荧光辐射已经在多种金属纳米颗粒和颗粒对中被证明,但是利用金属纳米结构对荧光分子的吸收和辐射过程同时进行调制仍然是一个有挑战的问题.本文研究了金属-介质-金属超表面对荧光辐射的调控,其中局域表面等离激元(LSP)和磁等离激元(MPP)分別与于分子的吸收和辐射过程发中耦合相互作用.对于吸收过程,LSP的耦合作用使得可以通过旋转泵浦激光的偏振态来实现荧光分子的空间选择激发.此外,MPP模式的偏振依赖特性使得矩形渔网结构中的荧光分子的辐射波长和偏振态也受到调控.实验观测结果经过了时域有限差分模拟的验证.本文报道的纳米结构在光辐射器件和纳米尺度集成光源等方面都具有潜在的应用价值.     

纤维素-三（4-甲基苯甲酸酯）手性固定相拆分5种芳基丙酸类药物对映体及其制剂的含量测定

采用纤维素-三（4-甲基苯甲酸酯）（CTMB）手性固定相,利用反相色谱法研究了氟比洛芬、普拉洛芬、布洛芬、萘普生、洛索洛芬5种芳基丙酸类手性药物的色谱拆分行为。考察了流动相组成、酸碱添加剂及柱温对上述5种药物对映体分离的影响,并通过热力学研究及对映体结构分析对CTMB固定相的手性拆分机理进行了探讨。结果表明,除萘普生采用乙腈-0.1%（v/v）甲酸溶液外,以甲醇-0.1%（v/v）甲酸水溶液为流动相可使普拉洛芬、洛索洛芬、氟比洛芬和布洛芬的对映体间的分离度均大于1.5,CTMB固定相对这5种芳基丙酸类药物的手性拆分能力依次为普拉洛芬>洛索洛芬>氟比洛芬>布洛芬>萘普生。在各自的优化色谱条件下,将方法应用于上述5种药物制剂的含量测定,结果令人满意。     

边界元法分析粘性液体小幅晃动

本文采用了边界元法对容器中粘性、不可压缩液体小幅晃动进行数值分析。在频域内考虑二维线性化Navier-Stokes方程,以问题的物理变量作为数值分析的未知函数,并推导了该问题分析的边界积分方程。自由面上的动力学条件为法向正应力和切向剪应力为零,这两个条件本身是线性的,避免了采用无粘势理论边界条件的非线性,固壁面上采用流体质点与固壁质点速度相等的条件,在数值计算过程中,结合有限差分法对边界条件进行了处理,由此建立了问题的一个边界元数值求解过程。