利用含δ介子的相对论平均场理论研究中子星潮汐形变性质

开展中子星宏观性质的研究,对于揭示中子星内部组成和结构具有重要意义.本文基于相对论平均场理论模型,研究了δ介子对传统中子星和超子星物态方程、最大质量、勒夫数和潮汐形变能力的影响.结果表明,对于中小质量传统中子星(或超子星), δ介子使其潮汐形变能力变强;随着传统中子星(或超子星)质量的增加, δ介子对其潮汐形变能力影响逐渐减弱;尤其对于大质量超子星,含有δ介子的超子星潮汐形变能力相比不含δ介子的超子星变弱.此外,在相同质量下超子的存在会降低星体的潮汐形变能力,在本文所选的参数下,含有δ介子的星体中,仅同时含L,Σ和Ξ超子的超子星潮汐形变能力能同时满足GW170817和GW190814天文观测约束.随着与中子星相关的引力波数据逐渐增加,将为人们判断超子星内超子种类提供一个可能的途径.     

Nucleonic ~1S_0 Superfluidity Induced by a Soft Pion in Neutron Star Matter with Antikaon Condensations

The nucleonic ~1S_0 superfluidity is investigated by solving the gap equation for the Reid soft-core potential as the nucleon-nucleon interaction in neutron star(NS) matter which is considered to be made up of p, e, μ and condensed antikaon matter. We mainly study the influence of the soft pion-induced potential on the nucleonic~1S_0 pairing gaps in the above NS matter. It is found that the intensities of the nucleonic ~1S_0 pairing gaps including the soft pion-induced potential are smaller than those calculated in the case of not including the soft pion-induced potential. Furthermore, the nucleonic ~1S_0 pairing gaps with the soft pion-induced potential fall into decline with the deepening of the optical potential of antikaons in the above NS matter, whereas they increase with the parameter η for the fixed optical potential of antikaons. Due to the appearance of the soft pion-induced potential, the maximum values of nucleonic ~1S_0 pairing gaps at parameter η = 0.20,0.55 are suppressed by1.7%-6.8% with respect to the case without soft pion-induced potential in the above NS matter.     

Effects of a Weakly Interacting Light U Boson on Protoneutron Stars Including the Hyperon-Hyperon Interactions

In the framework of the relativistic mean field theory including the hyperon-hyperon(YY) interactions,protoneutron stars with a weakly interacting light U boson are studied. The U-boson leads to the increase of the star maximum mass. The modification to the maximum mass by the U-boson with the strong YY interaction is larger than that with the weak YY interaction. The maximum mass of the protoneutron star is less sensitive to the U-boson than that of the neutron star. The inclusion of the U-boson narrows down the mass window for the hyperonized protoneutron stars. As g~2/μ~2 increases, the species of hyperons, which can appear in a stable protoneutron star decrease. The rotation frequency, the red shift, the momentum of inertia and the total neutrino fraction of PSR J1903-0327 are sensitive to the U-boson and change with g~2/μ~2 in an approximate linear trend. The possible way to constrain the coupling constants of the U-boson is discussed.     

基于眼模型的折/衍混合眼底相机设计

应用二元衍射光学理论,设计了一个基于Gullstrand-LeGrand眼光学模型的折／衍混合免散瞳手持式数字眼底相机．该相机的视场角28°,摄影系统由五片透镜构成,其中包含一个二元面．在综合考虑人眼本身和外部系统的像差后,实现了全视场200万像素的高清晰成像,具有较大调焦能力,对-10D至7D屈光度人眼普遍适用．结果显示,该系统成像分辨率高于120lp／mm,场曲值小于0．75mm,畸变仅为7．0％,色差小于3．5μm．衍射光学元件的引入,有效地简化了系统,减小了重量和体积．     

K^- Condensation in Neutron Star Matter with △ Quartet

In the framework of relativistic mean field theory, the condensations of K^- and K^0 in neutron star matter including baryon octet and △ quartet are studied. We find that in this case K^- and K^0 condensations can occur at relative shallow optical potential depth of K^ from -80 MeV to -160 MeV. Both K^- and K^0 condensations favor the appearances of △ resonances. With K^- condensations all the △ quartet can appear well inside the maximum mass stars. The appearances of △ resonances change the composition and distribution of particles at high densities. The populations of △ resonances can enhance K^- condensation. It is found that in the core of massive neutron stars, neutron star matter includes rich particle species, such as antikaons, baryon octet, and △ quartet. In the presence of △ resonances and K^- condensation, the EOS becomes softer and results in smaller maximum mass stars. Furthermore the impact of antikaon condensations, hyperons, and △ resonances on direct Urca process with nucleons is also discussed briefly.     

基于眼模型的折/衍混合眼底相机设计

本文应用二元衍射光学理论,设计了一个基于Gullstrand-Le Grand眼光学模型的折/衍混合免散瞳手持式数字眼底相机。该相机的视场角28°,摄影系统由五片透镜构成,其中包含一个二元面,在综合考虑人眼本身和外部系统的像差后,实现了全视场200万像素的高清晰成像。而且,具有较大调焦能力,对-10D至7D屈光度人眼普遍适用。结果显示,该系统成像分辨率高于120lp/mm,场曲值小于0.75mm,畸变仅为7.0%。同时,衍射光学元件的引入,有效地简化了系统,减小了重量和体积。     

β-环糊精增敏荧光法测定果蔬中呋喃丹的残留量

利用荧光光谱法探讨了β-环糊精与呋喃丹间的超分子相互作用,证明β-环糊精与呋喃丹可形成1:1的超分子包合物,在λex/λem=272/323 nm处发射强荧光,包合常数为108.2 L·mol-1。据此建立了测定水溶液中呋喃丹的荧光分析新方法。在0.0025～0.03μg/mL范围内,呋喃丹的荧光强度与浓度呈良好的线性关系,相关系数R=0.9990,方法的检出限为0.0013μg/mL,相对标准偏差为1.2%。该体系的抗干扰能力及稳定性好,实际样品分析回收率为98%～102%。     

胶束增敏荧光法测定甲氰菊酯的研究

在pH=6.0的Britton-Robinson缓冲溶液中,十六烷基三甲基溴化胺(CTMAB)对甲氰菊酯的荧光有增敏作用,通过对表面活性剂及用量、介质pH值、温度及放置时间的探讨,建立了增敏荧光法测定甲氰菊酯的新方法。该方法线性范围为0.14~2.3ng/mL,检出限为0.042ng/mL。方法可用于蔬菜中甲氰菊酯残留的测定。