低密度、弱束缚核结构研究

讨论了用平均场理论研究低密度、弱束缚核性质中的主要物理问题,着重研究在同位旋极端条件下的核子的有效相互作用、平均场和同位旋相关性.     

离子-电子非平衡机制降低中心热斑点火条件

提出通过离子-电子非平衡物理模型来降低惯性约束聚变中心热斑点火的聚变点火条件。在该物理模型中,强调离子比电子具备更高的温度,从而使得热斑的热核聚变反应增强,轫致辐射和电子热传导造成的能量漏失相对降低。通过对中心热斑的自加热分析和热斑燃烧动力学分析,发现相对于平衡聚变点火模型,非平衡模型可以显著扩大聚变点火区在热斑面密度和热斑温度空间的范围。同时采用LARED-S程序的数值模拟,研究了通过尖峰脉冲波形、二次冲击物理机制强化中心热斑聚变点火的非平衡性。     

HL—1M托卡马克中的硼化

用碳硼烷加氢直流辉光放电，在ＨＬ－１Ｍ托卡马克内壁上原位涂覆了含碳硼膜，平均厚度５０－７０ｎｍ硼碳比约为１：６。硼化后器壁条件有了本质的改善，对器壁上氧源的抑制特别显著，也增强了石墨表面抗氢离子和氢原子化学蚀刻能力。硼化显著了改善了等主子体性能和提高了等离子体参数。扰动显著减小，放电稳定性和重复性提高。硼化为低混杂波电流驱动实验创造了良好的壁条件。     

光本性的认识

 光学是物理学中较古老的一门基础学科,又是当前物理学领域最活跃的前沿之一.然而光学也是经过一场场磨难和斗争才发展起来的,其历史被当作自然科学发展史的典范,对光本性认识的争论是光学发展主要动力之一.     

肥皂膜过滤器的性能探究

物质分离是很多医疗和工业的核心技术.传统的固体过滤膜可以允许小于临界尺寸的粒子通过而阻挡大的粒子透过.然而,允许大粒子通过而小粒子停留的膜却很难人工制造.Birgitt Boschitsch Stogin、Luke Gockowski等人证明了完全由液体组成的液膜可以被设计成保留小于临界尺寸粒子而透过大尺寸粒子的过滤膜.基于上述研究,本文在液膜过滤器模型基础上进行解析推导,分析讨论了液膜的临界透过条件,并在实验中得到验证.同时,本文通过调节液膜表面张力系数实现了对粒子速度的筛选.     

基于传统文化的探究式教学设计研究——以粤沪版“研究物体的浮沉条件”教学设计为例

围绕立德树人,弘扬中华优秀传统文化,以粤沪版“研究物体的浮沉条件”教学设计为例,浅探基于传统文化的探究式教学设计方案,为把中华优秀传统文化融入初中物理学科教育提供参考.     

金属蒸汽中的激光维持爆震波

 应用我们发展的一个激光与金属蒸汽相互作用的简化物理模型对激光维持爆震波的点火激励、传播规律作了数值研究并取得了较好的结果。计算得到的LSD波阈值与激光脉宽的关系表现出典型的幂规律I_th∝τ^-1/2。此外，还得到了一些关于LSD波屏蔽效应的有益结果。在LSD波充分发展的阶段，LSD波阵面的光学厚度可达5~10的量级，这表明LSD波具有很强的屏蔽作用。     

叠氮化铅的等离子体电子作用机理初探

本文分析了装有不同药剂的半导体桥（Semiconductor Bridge,SCB）火工品的电流信号,结合叠氮化铅（Lead Azide,LA）的铅核反应机理,探索性地分析了等离子体中电子对药剂分解反应的影响.表明SCB等离子体中的电子可能直接参与铅核的生成反应,使Pb²⁺/Pb⁰转化变得容易,实现6.89μs的发火.     

Experimentally Determining Bloch Parameters of Hamiltonian for Single-Qubit Systems

By considering the identification problem of unknown but fixed Hamiltonian H = S0σ0 ＋∑i=x,y,z Siσi where σi （i = x, y, z） are pauli matrices and σ0=I, we explore the feasibility and limitation of empirically determining the Hamiltonian parameters for quantum systems under experimental conditions imposed by projective measurements and initialization procedures. It may be unsurprising to physicists that one can not obtain the knowledge of So no matter what kind of projective measurements and initialization are permitted, but the observation draws our attention to the importance of the parameter identifiability under different experimental condition. It has also been revealed that one can obtain the knowledge of ｜Sz｜ and Sx^2＋Sy^2 at most when only the projective measurement {｜0/（0｜, ｜1/（1｜} is permitted to perform on and initialize the qubit. Further more, we demonstrated that it is feasible to distinguish ｜Sx｜, ｜Sy｜, and ｜Sz｜ even without any a priori information about Hamiltonian if at least two kinds of projective measurement or initialization procedures are permitted. It should be emphasized that both projective measurements and initialization procedures play an important role in quantum system identification.     

Is the Near-Earth Current Sheet Prior to Reconnection Unstable to Tearing Mode？

The tearing mode instability plays a key role in the triggering process of reconnection. The triggering collisionless tearing mode instability has been theoretically and numerically analyzed by many researchers. However, due to the difficulty in obtaining the observational wave number, it is still unknown whether the tearing mode instability can be excited in an actual plasma sheet prior to reconnection onset. Using the data from four Cluster satellites prior to a magnetospheric reconnection event on 13 September 2002, we utilized the wave telescope technique to obtain the wave number which corresponds to the peak of power spectral density. The wavelength is about 18RE and is consistent with previous theoretic and numerical results. After substituting the wave vector and other necessary parameters of the observed current sheet into the triggering condition of tearing mode instability, we find that the near-Earth current sheet prior to reconnection is unstable to tearing mode.