以太网交换机测试方法的研究

根据以太网交换机的测试需求，考虑以太网交换机的技术特点，研究了以太网交换机的性能测试、功能测试、协议一致性测试、和稳定性测试等测试方法。     

单量子双能级系统和双态系统关联函数的研究

以具有简单三能级结构染料分子的单量子系统为研究对象,用带有边界条件的速率方程来反映低功率单色连续激光激励下单分子发射荧光的动力学过程.该方法可以通过时间分辨光子探测获得处理单分子动力学随机过程.研究给出了一种通过求解反映单量子系统动力学过程的物理量——延迟函数计算关联函数的方法,并给出了双能级系统和双态系统延迟函数和关联函数的具体表达式.研究表明,在实际测量中只要获得关联函数曲线,就可以通过数据拟合计算出分子跃迁的动力学参量.     

A Novel Implementation Technique of Conical Scan Radar Using A Programmable Phased Array

In radar, planar phased array antenna plays vital role in electronic scanning in the azimuth and elevation direction to the horizon. In most operations using planar phased array both the coordinates of azimuth and elevation, are steered electronically. In this paper a conceptual schematic of a phased array antenna with programmable time delay units has been presented. It is shown that by suitably exploiting the time delay matrix one can have electronic beam rotation around the target axis as required in conical scan. Thus both the elevation and azimuth motors in conical scan system are replaced by electronic scanning. Heuristically, we have selected eight consecutive points for beam rotation in a polygon shape and can also be extended almost circular shape by increasing number of array elements and phase shifter (delays) in the delay matrix. The array requires dual control of phase gradient and individual phase values. The whole array is controlled by micro-controller. This presents exciting possibilities in radar operation.     

Hydrogen-nitrous oxide delay times: Shock tube experimental study and kinetic modelling

Hydrogen-nitrous oxide mixtures have been studied for decades. In addition to their fundamental interest, they might play an important role in semi-conductor industry safety. Indeed, in silane-nitrous oxide mixtures, widely used in this industry, the silane molecule readily decomposes into molecular hydrogen which can react violently with nitrous oxide. Despite numerous shock tube studies on H₂-N₂O delay times, the pressure effect has never been addressed. The present work aims at studying this effect and at developing a detailed kinetic mechanism able to accurately reproduce experimental delay time data. Delay times of H₂-N₂O-Ar mixtures have been measured behind reflected shock waves in the 1300-2000 K temperature range and at a pressure around 300 kPa. Mixtures equivalence ratios ranged between 0.5 and 2, and the dilution was 98 and 99 mol% Ar. The present results and those from a previous study carried out in our institute show, first that, in the studied conditions, the equivalence ratio has no influence on delay times, and second, that the pressure increase drastically reduces the delay times. A kinetic model has been constructed from previously published mechanisms and tested against the present data with a mean error of 29%. Moreover, other delay time data from the literature for H₂-O₂-Ar, NH₃-Ar and H₂-N₂O-Ar mixtures are also correctly reproduced as well as macroscopic parameters such as reduced activation energies.     

修理延迟的设备修如旧模型的可用度

本文通过将使用时间在可能发生故障的时刻划分成时间区间,对修如旧模型下的多部件系统,在修理延迟条件下,对各类故障在同一时间区间里相容的条件下导出了任意给定时刻设备的可用度函数,并对文[3]中的算法做了改进,得到了更精确更合理的结果     

Delay in the alternating-offers model of bargaining

Alternating offers bargaining has been extensively used to model two-sided negotiations. The celebrated model of Rubinstein [Econometrica 50(1):97–109, 1982] has provided a formal justification for equitable payoff division. A typical assumption of these models under risk is that the termination event means a complete and irrevocable breakdown in negotiations. In this paper, the meaning of termination is reinterpreted as the imposition to finish negotiations immediately. Specifically, bargaining terminates when the last offer becomes definitive. While Rubinstein’s model predicts an immediate agreement with stationary strategies, we show that the same payoff allocation is attainable under non-stationary strategies. Moreover, the payoffs in delayed equilibria are potentially better for the proposer than those in which agreement is immediately reached.     

Stability and bifurcation in a discrete system of two neurons with delays

In this paper, we consider a simple discrete two-neuron network model with three delays. The characteristic equation of the linearized system at the zero solution is a polynomial equation involving very high order terms. We derive some sufficient and necessary conditions on the asymptotic stability of the zero solution. Regarding the eigenvalues of connection matrix as the bifurcation parameters, we also consider the existence of three types of bifurcations: Fold bifurcations, Flip bifurcations, and Neimark–Sacker bifurcations. The stability and direction of these three kinds of bifurcations are studied by applying the normal form theory and the center manifold theorem. Our results are a very important generalization to the previous works in this field.     

On a comparison principle for delay coupled systems with nonlocal and nonlinear boundary conditions

This paper is concerned with delay coupled systems of parabolic equations with nonlocal and nonlinear boundary conditions. For them, a new and general comparison principle is established, which is more general and useful than the existing results.     

A deterministic EOQ model with delays in payments and price-discount offers

It is the purpose of this paper to model the retailer’s profit-maximizing strategy when confronted with supplier’s trade offer of credit and price-discount on the purchase of merchandise. Generally, retailers have to face many types of demands for different kinds of goods. In real situation, retailers have to correlate between the selling price and supplier’s trade offer, keeping in mind profit-maximization strategy. In the proposed model, all increasing deterministic demands are discussed analytically, numerically and graphically in the environment of permissible delay in payment and discount offer to the retailer.