High accuracy calculation of the hydrogen negative ion in strong magnetic fields

Using a full configuration-interaction method with Hylleraas-Gaussian basis function,this paper investigates the 110 +,11(-1) + and 11(-2)+ states of the hydrogen negative ion in strong magnetic fields.The total energies,electron detachment energies and derivatives of the total energy with respect to the magnetic field are presented as functions of magnetic field over a wide range of field strengths.Compared with the available theoretical data,the accuracy for the energies is enhanced significantly.The field regimes 3 < γ < 4 and 0.02 < γ < 0.05,in which the 11(-1) + and 11(-2) + states start to become bound,respectively,are also determined based on the calculated electron detachment energies.     

Perfect absorption in a monolayer graphene at the near-infrared using a compound waveguide grating by robust critical coupling

We present a perfect graphene absorber with a compound waveguide grating at the near-infrared. The analytical approach is mainly based on the coupled leaky mode theory, which turns the design of the absorber to finding out the required leaky modes supported by the grating structure. Perfect absorption occurs only when the radiative loss of the leaky mode matches the intrinsic absorption loss, which is also named the critical coupling condition.Furthermore, we also demonstrate that the critical coupling of the system can be robustly controlled, and the perfect absorption wavelength can be easily tuned by adjusting the parameters of the compound waveguide grating.     

迈耶夫人

 对于居里夫人,绝大多数读者是很熟悉的。然而,继居里夫人之后半个世纪,又有一位女科学家获得诺贝尔物理学奖---她就是玛丽亚·戈佩特·迈耶。2006年恰逢迈耶夫人诞生100周年,我们回顾她的生平和她对科学事业的贡献是很有意义的。迈耶夫人生平玛丽亚·戈佩特·迈耶（MariaGoeppertMayer,1906¹972,即迈耶夫人,原名玛丽亚·戈佩特）出生于德国的上西里西亚地区（第一次世界大战后归属波兰）卡托维兹市的教授世家,前六代都是德国大学教授。她是父母的独生女。     

现代磁学奠基人——约翰·范弗累克

约翰.哈斯布鲁克.范弗累克是著名的美国理论物理学家,1977年诺贝尔物理学奖的获得者.本文介绍了他的生平,叙述他在科学研究中的重要贡献,以及他在培养学生上的成就.     

IP over WDM网络中可恢复的路由选择策略与算法

研究了IP over WDM网络中各层备用资源的分配问题,提出了一种新的IP over WDM网络中可恢复的路由选择策略以及应用于其中的备用路由选择算法.该策略通过层间备用资源共享,能够完全利用网络中为恢复光层故障所预留的资源来进行IP层故障恢复,从而大大提高了网络的资源利用率.对所提出的策略进行了性能分析,并给出了相应的性能指标.     

一种实现负荷均衡的动态波长分配新算法

提出了一种新的动态波长分配算法:负荷均衡法.新算法将负荷均分到各个波长上,使各段链路上预留的波长资源最大化;同时,更加准确地考虑了分配波长对于整个网络的影响,将分配波长对整个网络的影响降低到最低程度.仿真结果表明:新的算法能更好地提高网络的性能.     

迈耶夫人与核壳层模型

介绍了迈耶夫人的生平和她对物理学的主要贡献,回顾了她从幻数入手,继而建立原子核壳层模型的过程,以及由此带给我们的启示.     

Accurate calculations of the helium atom in magnetic fields

The 1 1 0 +,1 1 (-1) + and 1 1 (-2) + states of the helium atom in the magnetic field regime between 0 and 100 a.u.are studied using a full configuration-interaction (CI) approach.The total energies,derivatives of the total energy with respect to the magnetic field and ionisation energies are calculated with Hylleraas-like functions in spherical coordinates in low to intermediate fields and Hylleraas-Gaussian functions in cylindrical coordinates in intermediate to high fields,respectively.In intermediate fields,the total energies and ionisation energies are determined in terms of Hermite interpolation,based on the results obtained with the two above-mentioned basis functions.Calculations show that the current method can produce lower total energies and larger ionisation energies,and make the two ionisation energy curves obtained with the two above-mentioned basis functions join smoothly in intermediate fields.Comparisons are also made with previous works.     

IP/GMPLS/Optical多层网络生存性机制的协调

通过对多层网络生存性问题、独立的网络生存性配置方案和多层网络生存性配置方案的研究分析,基于快速发展的GMPLS技术提出了IP/GMPLS/Optical多层网络结构,明确了多层网络生存性方案存在的问题,并利用GMPLS的统一控制平面进一步提出了基于层间协调机制的集成多层网络生存性方案,获得了优化的多层网络故障恢复能力.     

超导BCS理论的建立

介绍了巴丁、库珀和施里弗的生平,回顾了BCS理论的建立过程,综述了BCS理论建立的影响和意义,以及由此带给人们的有益启示.