Multiplicity Regions in a Moving‐Bed Reactor: Bifurcation Analysis,Model Extension,and Application for the High‐Temperature Pyrolysis of Methane

This paper reports studies on the bifurcation analysis and the generation of regions of multiplicity in the operation of moving‐bed reactors. The studies were first carried out for a generalized model, which allows the investigation of the effect of various scenarios, such as changes in heat capacity or the number of moles with reaction, as well as the previously unstudied equilibrium and allothermic reactions. The insights gained from this extension were then applied to an actual reaction, namely the high temperature pyrolysis of methane.     

1.7AGeV84Kr诱发乳胶核反应慢粒子产生

对1.7AGeV⁸⁴Kr诱发乳胶核反应慢粒子产生进行研究。实验结果表明,黑径迹粒子、灰径迹粒子和重电离粒子平均多重数随碰撞中心度及靶核大小的增加而增加;灰径迹粒子和重电离粒子平均多重数随黑径迹粒子数的增加而增加;重电离粒子平均多重数随灰径迹粒子数的增加而增加,而黑径迹粒子平均多重数随灰径迹粒子数的增加表现出先增加后趋于饱和的趋势;灰径迹粒子平均多重数随重电离粒子数的增加而增加,而黑径迹粒子平均多重数随重电离粒子数的增加表现出先增加后趋于饱和。以上结果均可利用核碰撞几何模型来解释。     

等温CMSMPR结晶器定态及瞬态特性分析(Ⅰ)存在多定态及发生持续振荡的条件

运用分岔理论 ,对同时发生初级成核和二次成核的等温连续混合悬浮混合排料 (CMSMPR)结晶器的定态特性进行了分析 ,推导了系统存在多定态及发生持续振荡的参数条件 .以结晶过程的物性参数、动力学参数以及操作参数为基础 ,应用非线性方程组的延拓方法分别求解极限点条件方程组及Hopf分岔点条件方程组 ,确定了系统存在多定态及发生持续振荡的参数边界     

Transport Infrastructural Investment Project Rankings under Quasi-uniform Resource Allocating Constraint, Assisted by a Multicriterion Analysis Process

Consider: (1) a finite set of transport infrastructural investment projects (TIIP) previously analysed by the decision maker(s) in the framework of some multicriterion analysis process in order to reveal a preference (i.e. precedence)—relation pair set (PRS) and; (2) the ranking problem of this TIIP subject to the PRS constraints and a quasi-equal financial expenses rhythm-constraint. We outline an algorithmic aid of this ranking problem exploiting deliberately the non-mutual congruity between an incomplete PRS and resulting hierarchical structures.     

用于核保障中核材料衡算的液体闪烁体中子多重性测量装置

本工作优化设计建立了1套可用于核保障中核材料衡算的液体闪烁体中子多重性测量装置，并基于该装置开展了性能测试。结果表明，装置运行状态稳定，各项指标均在可接受范围内。同时开展了对²⁵²Cf源和标准Pu样品的实验室模拟测量等中子多重性测量研究。结果表明，该测量装置的探测效率好于15%，测量相对标准偏差为8.6%，表明在条件允许时，通过长时间信号采集，该中子多重性测量装置有能力替代基于³He管的中子多重性测量装置，通过中子多重性分析完成核保障中核材料衡算定量测量任务。     

Analysis and prediction of input multiplicity for the reactive flash separation using reaction-invariant composition variables

In this study, we introduce a new approach for predicting and analyzing the input multiplicity in reactive flash separation processes. Specifically, we have identified necessary conditions to detect these multiple states in reactive flash separations using reaction-invariant composition variables. The presence of the input multiplicity is studied for the reactive systems of MTBE and TAME production to illustrate the capabilities of our methodology. For these reactive systems, we report the existence of multiple states for different operating conditions. In summary, our strategy can be applied with any reactive system and thermodynamic model, assuming that all reactions are reversible and in thermodynamic equilibrium and the operating conditions are away from the retrograde region. In general, our method is a robust procedure for the multiplicity analysis in flash separation of multi-reactive and multi-component systems.     

基于嵌入蒙特卡罗模拟计算的遗传算法对多重测量装置3He管排布的优化

为提高NDA方法测试分析精度,降低统计误差,在研制中子多重测量装置时通常将探测效率作为重要的设计目标。本文将蒙特卡罗模拟嵌入遗传算法中,以假想的90根³He管中子多重测量装置为例,利用该方法对其³He管分布进行理论模拟和优化,在短时间内求出探测效率为37%的最优排布。同时,利用蒙特卡罗模拟了随机抽样产生的1000个有效排布,并对随机抽样分析与遗传算法结果进行比对分析。结果表明：利用遗传算法确定³He管分布是快速有效的。     

On Some Aspects of the Deligne–Simpson Problem

The Deligne-Simpson problem in the multiplicative version is formulated as follows: give necessary and sufficient conditions for the choice of the conjugacy classes C _j GL(n, ), so that there exist irreducible (p + 1)-tuples of matrices M _j C _j satisfying the equality M ₁ . . . M _p+1 = I.We solve the problem for generic eigenvalues in the case where all the numbers _j,m() of Jordan blocks of a given matrix M _j with a given eigenvalue and of a given size m (taken over all j, , and m) are divisible by d > 1. Generic eigenvalues are defined by explicit algebraic inequalities of the form a 0. For such eigenvalues there exist no reducible (p + 1)-tuples.The matrices M _j are interpreted as monodromy operators of regular linear systems on the Riemann sphere.     

中走丝线切割多次切割跟踪式喷射流装置

随着模具加工技术迅速发展的需要及零件加工精度的不断提高,对中走丝线切割机床的加工精度和表面粗糙度提出了更高的要求.该文通过查阅相关资料和对一些重要资料进行研究和整理后设计实现了一种利用AT89C52单片机、金属传感器、步进电机以及滚珠丝杠组成的中走丝线切割多次切割跟踪式喷射流装置.该装置研究通过动态跟踪控制装置有效地控制工作液喷射压力和高度,以增强冷却和排屑效果,降低工件的表面粗糙度,进而提高工件的切割精度和切割效率.通过实际生产应用后表明,该跟踪式喷射流装置对提高零件的加工精度和切割效率具有很强的实用性.