运用分子模拟计算和NMR研究确定化合物3-(3,5-二甲基-2-吡咯亚甲基)-5-溴-吲哚酮的绝对构型

用MM2和半经验AM1方法对化合物进行计算,获得化合物两种构型的原子间距离参数,依据¹H NMR产生NOE效应所需条件预报分子中可能存在的NOE.通过与实验测得的核磁共振NOE效应结果对比,确定化合物构型.     

改进的2PPJ格式

提出了解线性代数方程组的一种方法,称为改进的2PPJ(Modified two parameters parallel Jacobi-type)格式,简记为M2PPJ.讨论了它的收敛性和最优参数的选取.收敛速度比2PPJ格式快一倍以上.给出的数值结果说明本方法的优越性.     

成组设计在高功率激光装置中的应用

在高功率激光装置研制中首次引入成组技术概念,并以空间滤波器为例论证了在高功率激光装置的器件研制过程中实施成组设计的必要性和可行性最后讨论了计算机辅助成组设计系统(GTCAD)的组成和在高功率激光装置中具体实施过程.     

熊猫光纤的结构与双折射特性关系研究

本文用微元算法研究了熊猫光纤的结构参量对熊猫光纤双折射特性(拍长)的影响.由实验数据拟合出了计算拍长的熊猫光纤掺杂区的有效热膨胀系数.计算结果表明,熊猫光纤的猫眼半径、猫眼与纤芯的距离、猫眼的不一致等都是影响拍长的因素.所得结果对熊猫光纤的制作提供了理论指导.     

超声波强化煤泥浮选脱硫研究

叙述了超声波在选矿工程中的应用,研究了超声波处理对矿浆颗粒性质变化、矿浆中溶解氧和矿浆ｐＨ值的影响,探索了超声强化浮选脱硫的可行性,提出超声处理矿浆作为一种手段,配合适当的浮选工艺与黄铁矿抑制方法,能达到浮脱硫的最佳效果。     

中心力场中散射角的简洁推导

本文从牛顿方程及角动量守恒定律出发 ,利用矢量函数的微积分运算技巧简捷地推导出中心力场中散射角 φ,避免了经典教科书中从轨道方程出发推导出 φ的繁琐性 ,不仅计算简洁 ,而且物理过程明确 .     

Sasakian Submanifolds of Kaehlerian Manifolds(Ⅱ)

In this paper,it is proved that the Sasakian anti-holomorphic submanifolds of a Kaehlerian manifold is characterized by D-totally umbilical,and some curvature properties of the CR-submanifolds are ohtained.     

Pathwise Estimation of Stochastic Differential Equations with Unbounded Delay and Its Application to Stochastic Pantograph Equations

The existence and uniqueness of the global solution of stochastic differential equations with discrete variable delay is investigated in this paper, and the pathwise estimation is also done by using Lyapunov function method and exponential martingale inequality. The results can be used not only in the case of bounded delay but also in the case of unbounded delay. As the applications, this paper considers the pathwise estimation of solutions of stochastic pantograph equations.     

Incorporating quantity discounts and their inventory impacts into the centralized purchasing decision

Multi-site organizations must balance conflicting forces to determine the appropriate degree of purchasing centralization for their respective supplies. The ability to garner quantity discounts represents one of the primary reasons that organizations centralize procurement. This paper provides methodologies to calculate optimal order quantities and compute total purchasing and inventory costs when products have quantity discount pricing. Procedures for both all-units and incremental quantity discount schedules are provided for four different strategic purchasing configurations (scenarios): complete decentralization, centralized pricing with decentralized purchasing, centralized purchasing with local distribution, and centralized purchasing and warehousing. For ordering decisions under local distribution, procedures to determine optimal order quantities and costs are presented in a precise form that could be easily implemented into spreadsheets by practicing managers. For the more complicated multi-echelon scenarios, we introduce a single-cycle policy with a tailored aggregation refinement step that performs very well under experimentation when compared to a conservative bound.     

A branch-and-bound algorithm to minimize the line length of a two-sided assembly line

A new branch-and-bound algorithm is presented to solve the two-sided assembly line balancing problem of type 1 (TALB-1). First, a pair of two directly facing station is defined as a position, and then the two-sided assembly line (TAL) is relaxed to a one-sided assembly line (OAL). Some new lower bound on positions are computed, and dominance rules and reduction rules for the one-sided assembly line balancing problem of type 1 (OALB-1) are extended and incorporated into a station-oriented assignment procedure for the TALB-1 problem. Finally, the tests are carried out on a well-known benchmark set of problem instances, and experimental results demonstrate that the proposed procedure is efficient.