电化学现场时间分辨电子自旋共振波谱

在电子自旋共振对电化学暂态过程的研究中，人们通常将磁场固定在对研究信号敏感的位置，记录ＥＳＲ强度随时间的变化。这种作法常导致大量的信息遗失，不但得不完整ＥＳＲ谱线的变化，也很难分析多种磁物种共存的情况。     

用二次曲面方法求解多机系统故障临界清除时间

为提高多机系统故障临界切除时间的求解精度和保证确定的误差方向,该文在主导不稳定平衡点处利用空间二次曲面来近似局部稳定域边界,根据持续故障轨线与空间二次曲面的交点来确定系统的故障临界清除时间.仿真结果表明,该方法具有固定的误差方向和较高的计算精度,误差基本能控制在10%以内,能够对系统的故障严重程度进行排序.另外,在网络中发生故障时计算性能可能没有切平面方法好,这方面的理论根据还需进一步的研究和探索.     

空间体验的几何、物质和时间维度

从欧氏几何空间,建筑空间的物质属性和空间的时间性3个方面进行论述,从空间概念的由来、空间概念和现代建筑运动的紧密关系、物质材料对空间的直接影响、空间和时间体验等方面出发,展开讨论,对空间概念进行多方位多层次的解析,旨在对被经常论及的"空间"概念进行更深层次的探讨.     

FDTD modeling of transient scattering by subsurface targets

In this paper, a two-dimensional (2-D) finitedifference time-domain method (FDTD) scheme is used to simulate the transient scattering characteristics of buried objects, which are modeled by columns of arbitrary permittivities, conductivities, and sizes. The FDTD soil is modeled by isotropic, homogeneous and lossy media. The standing-traveling wave boundary condition (STWBC) that can simplify calculation and save CPU storage is used for modeling physical absorbers inside the FDTD computational dornairL Reflection of electromagnetic pulses incident on a layered medium and transient scattering by the ground and an underground airsqu are cylinder are computed. These results verify the validity of the FDTD scheme by comparisons with those shown in some references. Numerical results presented in the final part of this paper are desirable and meaningful, explicitly distinguishing echo waves stemming from the ground and the buried ohjects.     

论《左传》的叙事时间艺术

《左传》是我国第一部大规模的叙事作品,被誉为先秦散文"叙事之最",标志着我国叙事散文的成熟.研究中国小说,如果不顾及它与史传的关系,那就不可能深得中国小说的精髓.因此用叙事学的概念范畴,从叙事时间切入,来探讨《左传》的叙事艺术及对中国古典小说的影响是有着重要意义的.     

A scalable admission control scheme based on time label

Resource reservation protocols allow communicating hosts to reserve resources such as bandwidth to offer guaranteed service. However, current resource reservation architectures do not scale well for a large number of flows. In this paper, we present a simple reservation protocol and a scalable admission control algorithm, which can provide QoS guarantees to individual flows without per-flow management in the network core. By mapping each flow to a definite time, this scheme addresses the problems that limit the effectiveness of current endpoint admission control schemes. The overall admission control process is described. Analysis is used to explain the reasonability of our scheme and simulation validates its performance.     

HIRFL-CSRm纵向随机冷却-槽形滤波冷却模拟研究

 通过Fokker Planck方程,对拟在HIRFL-CSRm上建造的纵向槽形滤波器（notch filter）的冷却机理进行了研究,得出了冷却原理及冷却时间的表达式,并对影响冷却时间和冷却效果的因素进行了模拟和讨论,模拟结果表明,噪信比越小,冷却时间越短,冷却效果越好;带宽越宽冷却越快。该研究为具体纵向冷却系统的设计和优化提供了依据。     

Multiple Solutions and Its Morse Index for One-Dimensional Nonlinear Problem

The multiple solutions for one-dimensional cubic nonlinear problem u" u~3=0,u(0)=u(π)=0are computed,on the basis of the eigenpairs of-φ"_k=λ_(kφk),k=1,2,3....There exist two nonzero solutions±u_k corresponding to each k,and their Morse index MI(k) for 1(?)k(?)20 is to be exactly determined.It isshown by the numerical results that MI(k)(?)k.     

激光大气等离子体时间演化特性的光谱研究

采用延时光谱法和谱线演化法 ,对YAG脉冲激光器 1 0 6 μm光束击穿一个大气压的空气所产生的等离子体进行了时间分辨光谱研究。对激光大气等离子体连续光谱的短波带与长波带分别进行了时间分辨测量 ,结果表明两者的衰变速率均在等离子体激发约 0 5微秒以后明显变慢。分析认为这种衰变速率的变慢可能与空气中氧对自由电子的吸附与去吸附有关。对激光大气等离子体线状光谱所作的时间分辨测量则表明 ,大部分线状光谱的演化寿命大于其标称寿命 ,部分线状光谱还呈现“衰变—增涨—衰变”的复杂形式。分析认为线状光谱的这些演化特征可能与等离子体在衰变期间的各种复合过程和能量转移过程有关。     

水上交通观测天数与交通量估计精度的关系

利用数理统计与概率论的有关理论,在定义了以置信区间的长度与船舶交通量日均估计值之比作为"相对误差"的基础上,得到了船舶交通量观测时间与精度关系的有关结论.该结论可作为港口规划、实施船舶定线制及确定无线电岸台交换机容量决策的参考依据.