Multiplexed time-correlated single-photon counting

We review the technique of multiplexed time-correlated single-photon counting whereby multiple fluorescence decay curves are recorded in parallel by statistically time-sharing a single time-to-amplitude converter. Application of the multiplexing technique to measuring the fluorescence lifetime topography of a self-absorbing sample is demonstrated. Further possibilities are discussed for multiplexed optical fiber sensor networks with built-in intelligence for detecting and discriminating between different metal ions in solution.     

带有通胀风险的退休后最优投资-年金化时刻决策

研究了带通货膨胀的确定缴费养老计划退休后最优投资-年金化决策。假设通货膨胀过程是一个随机过程,建立了真实财富的波动过程。先相对固定年金化时刻,采取目标定位型模型,预设未来各时期的投资目标,利用贝尔曼优化原理,得到从退休时刻到相对固定年金化时刻之间的最优投资策略。接着建立了最优年金化时刻的评估标准,最优的年金化时刻使得年金化前后的累加消费折现均值得到最大。证明了在随机通货膨胀的假设下,传统的自然投资目标不存在;当随机通胀过程退化到确定过程时,求出了自然投资目标的显式表达式,并且在这两种情况下,分析了通胀情况对最优投资策略的影响。最后利用数值分析手段, 研究了通货膨胀、风险偏好、折现率对最优年金化时刻的影响。     

Performance testing of a long-strip two-end readout multi-gap resistive plate chamber

Multi-gap Resistive Plate Chamber (MRPC) is a new generation of gas detector with good tim-ing and spacial resolution, whose technique is widely applied in some recent high energy (nuclear) physics experiments. In this letter, we report a long-strip two-end readout MRPC and its test beam performance. The measurements show that the long-strip performs a transmission line characteristic and the impedance is independent of the length of strip. The MRPC module we developed is presented to gain a timing resolution of～80 ps and a spacial resolution of ～6.4 mm. The possible application of the MRPC is also discussed.     

对原并购企业有损害的企业并购时机与条件

假设并购失败对并购者原企业的资产有损害,或产生负协同效应,利用实物期权博弈论方法,研究随机市场下企业并购条件和时机.研究表明,目标企业保证金至少受四种因素影响:一是目标企业本身的特征;二是产业的特征,三是并购者的期望,以及并购失败对并购者原企业资产的损害评估.该损害可能性越大,目标企业要求的最优保证金越低,最优并购触发时间越长.给出两阶段数值模拟例子.模型可用于国有企业产权转让的定价,通过公开拍卖是国企产权转让的最佳选择.     

Beam transport design for a 1 MeV prototype dielectric wall accelerator

The beam transport design of a novel proton dielectric wall accelerator is introduced in this paper. The protons will be accelerated from 40 keV to nearly 1 MeV under an accelerating gradient that is as high as 20 MV/m. A consideration of the beam line as well as the transport simulation is presented. The influences of the injection timing jitter and the accelerating pulse timing jitter are also discussed.     

Optimal exercise of jointly held real options: A Nash bargaining approach with value diversion

This paper provides a two-stage decision framework in which two or more parties exercise a jointly held real option. We show that a single party’s timing decision is always socially efficient if it precedes bargaining on the terms of sharing. However, if the sharing rule is agreed before the exercise timing decision is made, then socially optimal timing is attained only if there is a cash payment element in the division of surplus. If the party that chooses the exercise timing can divert value from the project, then the first-best outcome may not be possible at all and the second-best outcome may be implemented using a contract that is generally not optimal in the former cases. Our framework contributes to the understanding of a range of empirical regularities in corporate and entrepreneurial finance.     

条纹相机系统在激光脉冲整形测量中的应用

针对采用脉冲堆积法进行激光脉冲整形后获取的宏脉冲,介绍了基于条纹相机观测其纵向分布的基本原理。阐述了测量系统中的硬件配置功能以及脉冲堆积原理,并描述了使用条纹相机专用软件测量激光脉冲的详细步骤和操作界面。研究了测量系统中时序控制的调试对观测脉冲堆积后的宏脉冲的影响并给出了测量结果和测量误差分析。结果表明:采用脉冲堆积法所获得的激光脉冲整形效果非常理想,整形前激光脉冲的半高全宽值约为3.82 ps,整形后约为15.3 ps,且平顶部分的脉宽为11.5 ps,上升沿和下降沿均为1.9 ps。     

古代计时器——水钟

通过对中国古代计时器水钟的原理研究,利用现代的技术和材料制作了水钟.采用2种方式将匀速的水流转化为其他形式变量:一种是水滴计数法,水钟计时时长15min,累计误差6s;另一种是将匀速的水流转换成质量信号,计时时长10min,累计误差2～3s.     

A linearized heat‐conducting fluid and its quasi‐static approximation

A linearized flow of a compressible inviscid heat‐conducting fluid is considered and a comparison is made with its coupled/quasi‐static approximation. Copyright © 2005 John Wiley & Sons, Ltd.     

Endogenous timing in duopoly: experimental evidence

In this paper we experimentally investigate Cournot duopolies with an extended timing game. The timing game has observable delay, that is, firms announce a production period (one out of two periods) and then they produce in the announced sequence. Theory predicts simultaneous production in the first period. With random matching we find that, given the actual experimental behavior in the subgames, subjects play a timing game more akin to a coordination game with two symmetric equilibria rather than the predicted game with a dominant strategy to produce early. As a result, a substantial proportion of subjects choose the second period.