可实现防碰撞通信的新型声表面波温度传感器

针对多声表面波传感器系统中各传感器信息读取时会产生通信碰撞的问题,提出了一种可实现防碰撞通信的新型声表面波温度传感器;通过分析声表面波温度传感器的回波脉冲信号,将沃尔什码作为编码内容实现了多声表面波温度传感器系统中各传感器的正交编码;将传感器对应的匹配信号与系统回波信号进行互相关运算,提取了系统中各传感器的感测温度信息,达到了防碰撞通信的目标;该传感器兼顾编码效率和加工工艺两方面要求,简化感测信息提取的复杂程度;仿真实验验证了上述理论的正确性。     

Statistics and Correlation Properties of Diamagnetic High Rydberg Hydrogen Atom

The spectra of Rydberg hydrogen atom in magnetic fields have been calculated using linear variational method with B-splines basis functions [Acta Phys. Sin. 55 （2006） 3380]. Based on these calculations we have done some statistics analysis about the high Rydberg energy levels. The nearest-neighbor energy spacing distribution and the 3-statistics have been shown about diamagnetic Rydberg hydrogen atom with the magnetic field being 0.6 T and 6 T. The phenomena of multiply crossing, multiply anti-crossing, and the mixed of crossing and anti-crossing of energy levels have appeared in this paper. For both cases, in range of lower energy, the energy 1evel statistics properties close to Poisson distribution. With the increasing of the energy, the energy level statistics properties are away to Poisson distribution and tend to Wigner distribution step by step.     

Four-Electron Quantum Ring in a Magnetic Field

We study a quantum ring （QR） with four electrons in a perpendicular external magnetic field B by exact diagonalization. The low-lying spectra of the QR as a function orb are obtained. A phase diagram is presented indicating that the angular momentum and the spin of the ground state of the QR may jump when B and/or the radius of the QR vary, and a corresponding analysis is performed. By plotting the density functions of the QR, the ground-state configuration is found to be a regular quadrangle. Furthermore, the features of the ground-state persistent current are revealed.     

Accurate One-Centre Method for Hydrogen Molecule Ions in Strong Magnetic Field

An accurate one-centre method for the hydrogen molecule ion is tested. The slow convergence and singularities at the nuclear positions that are problems in the general one-centre method axe solved well by employing the optimal radial and angular B-spline basis. Therefore, the accuracy of the one-centre method is improved observably. For the ground state of the H2^＋ in the free field, 7 ×10^-8 accuracy is obtained, which rivals the best one-centre calculation before. As a test, the nuclear distances and the total energies of the 1σ g,u, 1πu, 1δ9,u and 2σg states of the H2^＋ for the magnetic field strength B = 1 a.u. are also obtained. Compared to other results, five-digit accuracy at least can be arrived even for the antibonding states 1σu and 1σu, whose equilibrium distances R is very large.     

Debye屏蔽势下的Na原子

结合自由Na原子的l-依赖模型势, 采用B-样条基组展开方法计算了等离子体环境中Na原子的的基态能量、振子强度、偶极极化率、四极极化率、八极极化率等随Debye长度的变化. 其中原子的等离子体效应采用Debye屏蔽模型. 计算结果与其他研究者的结果符合得很好; 在Debye屏蔽等离子体环境下下基态能量的结果与Sahoo [Sahoo S Ho Y K 2006 Phys. Plasmas 13, 063301]和Li [Li H W and Kar S, 2012 Phys. Plasmas 19, 073303]用其他模型所得的结果基本一致; 电偶极、四极和八极极化率随Debye长度的变化趋势一致, 数值结果和Li和Kar [Li H W and Kar S, 2012 Phys. Plasmas 19, 073303] 的数量级一致.     

Yb^3+含量对掺Er^3+铝酸盐玻璃光谱性质的影响

采用高温熔融法制备百分比为(100-x)(23.6Al2O3-53CaO-7.7BaO-2.1Na2O-10.3Ga2O3-3.1B2O-0.2Er2O3)-xYb2O3(x=0,0.9,1.9,2.8,3.6,4.5)的铝酸盐玻璃。应用差示扫描量热法、吸收光谱、荧光光谱、红外光谱以及拉曼光谱等检测手段,系统研究了不同Yb^3+离子引入量对玻璃的物性、热稳定性、Er^3+离子光谱性质和结构的影响。结果表明,Yb2O3含量越高,玻璃的密度和折射率越大,抗析晶能力有所增强。随着Yb2O3的增加,玻璃在976 nm吸收系数增大,对应于Er^3+离子的2H11/2→4I15/2、4S3/2→4I15/2以及4F9/2→4I15/2跃迁的527,549,666 nm的上转换发光、红光与绿光发光强度比以及对应于4I13/2→4I15/2的1.53μm近红外荧光强度明显增加。当Yb2O3浓度为3.6%时,铝酸盐玻璃样品在近红外1.53μm荧光最强,此时Yb^3+→Er^3+正向能量传递效率η1最大,约为82.9%。该系列铝酸盐玻璃中Er3+离子1.53μm最大发射截面为0.77×10^-20 cm^2,荧光半高宽最大值为39.4 nm,荧光寿命最大值为4.46 ms。     

多层多屏绝热液氦杜瓦传热分析

分析了不同液氦杜瓦结构,指出多屏多层的杜瓦的优缺点。通过对多屏多层绝热中不同传热方式的逐个分析,建立了一个理论传热模型。依照模型采用数值分析的方式,对多层层数为100层时的传热进行了分析,获得传导冷屏分布方式对传热流密度的影响曲线,并指出多层多屏分布的优化应同时考虑空间和温度两个因素。     

氢原子Rydberg态抗磁谱的高阶B-spline基组计算

在球坐标下采用基组展开方法计算了均匀磁场中的氢原子高Rydberg态能谱和振子强度谱.径向和角向均采用高阶B样条基组. 径向采用B样条基组能很好地描述束缚态与连续态的耦合；角向采用B样条基组有效地减少了基组维数，计算效率得到大幅度提高. 用上述方法计算了磁场中氢原子Rydberg态-40cm^-1到零场电离阈的高精度抗磁谱并与已有理论和实验结果作了比较. 该方法适用于低于离化阈的所有能区的精确谱计算并易于推广到非氢原子、交叉场中的原子以及高于离化阈的正能区光谱的计算. 关键词： 氢原子 B样条基组 能谱 振子强度谱     

衍生于咔唑的双氰基二苯代乙烯型双光子荧光脂筏探针

制备了一个衍生于咔唑的双氰基二苯代乙烯型双光子荧光脂筏探针——(E)-2-甲基-5-{2-[9-正辛基(3-咔唑基)]乙烯基}对苯二甲腈(DLR), 并对其结构进行了表征. 结果表明, DLR属于推-拉电子结构(供体-桥-受体, D-π-A), 其最大发射波长随介质极性递增, 而其荧光强度却随极性递减. DLR在二棕榈酰磷脂酰胆碱 (DPPC)中的发射强度是在二油酰磷脂酰胆碱(DOPC)中的20倍, 其对DPPC, 模拟脂筏[n(DOPC)∶n(鞘磷脂)∶n(胆固醇)=1∶1∶1]和DOPC的荧光强度比为20∶12.8∶1, 在DPPC中的荧光寿命是在DOPC中的2.2倍以上, 表明DLR能很好地区分DPPC与DOPC. DLR在DPPC和DOPC中的双光子发射截面(Φδ)分别为1350和67 GM, 表明DLR能够很好地识别脂筏, 成像脂筏在细胞与组织中的分布动态.     

A Novel Method for PIT Effects Based on Plasmonic Decoupling

A tunable dual-band stop-band THz spectrum can be realized in a hybrid structure, which consists of metal nanoribbon arrays clad by graphene nanoribbons. Dual-band spectra can be controlled separately by the nanoribbon width ω and graphene chemical potential μ_c. We explain that two local plasmonic modes excited at graphene ribbons belong to different gratings, which uncouple with each other by electro-magnetic shielding of the metal ribbons. Furthermore, plasmonic induced transparent(PIT) effects can also be realized by making the two transmission notches close to each other, with better performance than the PIT system based on plasmonic coupling,such as with a larger extinction radio and a tunable transparency window.