聚乙烯/淀粉光-生物降解薄膜的降解性能及其对作物的影响

报道了聚乙烯/淀粉光-生物降解薄膜的光降解和生物降解性能及其对农作物的影响.结果显示,薄膜具有明显的降解作用,覆盖降解薄膜后,农作物的产量增加.     

民国时期东北海军的兴衰

东北海军是20是20年代在吉黑江防舰队基础上发展起来的一支地方性海军,全盛时期下辖3个舰队,26艘舰艇,总排水量近2万吨,兵力3万余人.这支舰队见证和经历了中国现代史上一系列重大事件:第二次直奉战争、北伐战争、中东路事件、九一八事变、全国抗日战争.她从诞生、发展到没落、消失的过程,折射了20世纪二三十年代中国历史发展的多样性与曲折性.     

How to deal with consumers who group to request a discount?

We investigate operations impacts of consumer‐initiated group buying (CGB), whereby consumers voluntarily form buying groups to negotiate bulk deals with retailers. This differs from regular purchasing whereby consumers visit retailers individually and pay posted prices. Upon the visit by group consumers, a retailer decides to forgo or satisfy their demand in its entirety. Turned down by a retailer, group consumers continue to visit other retailers. In the case where their group effort fails to conclude a deal, some group consumers switch to individual purchasing provided they receive a non‐negative utility by doing so. Even after a successful group event, the group consumers who forgo the event out of utility concern may switch to individual purchasing as well. Retailer competition, group size, and the chance that group consumers switch to individual purchasing upon unsatisfaction are crucial to how retailers adjust operations to deal with CGB. With retailer competition, the rise of CGB results in every consumer paying the same reduced price when group size is small but makes group consumers pay more than by purchasing individually when group size is large. This has mixed consequences on the profits for retailers in both absolute and relative terms.     

Two-agent scheduling with linear resource-dependent processing times

This paper considers a two-agent scheduling problem with linear resource-dependent processing times, in which each agent has a set of jobs that compete with that of the other agent for the use of a common processing machine, and each agent aims to minimize the weighted number of its tardy jobs. To meet the due date requirements of the jobs of the two agents, additional amounts of a common resource, which may be in discrete or continuous quantities, can be allocated to the processing of the jobs to compress their processing durations. The actual processing time of a job is a linear function of the amount of the resource allocated to it. The objective is to determine the optimal job sequence and resource allocation strategy so as to minimize the weighted number of tardy jobs of one agent, while keeping the weighted number of tardy jobs of the other agent, and the total resource consumption cost within their respective predetermined limits. It is shown that the problem is -hard in the ordinary sense, and there does not exist a polynomial-time approximation algorithm with performance ratio unless ; however it admits a relaxed fully polynomial time approximation scheme. A proximal bundle algorithm based on Lagrangian relaxation is also presented to solve the problem approximately. To speed up convergence and produce sharp bounds, enhancement strategies including the design of a Tabu search algorithm and integration of a Lagrangian recovery heuristic into the algorithm are devised. Extensive numerical studies are conducted to assess the effectiveness and efficiency of the proposed algorithms.     

泛函在射表逼近中的应用

运用泛函理论,对方差最小原则下射表逼近进行分析,给出了在给定基函数形式条件下的统一计算公式,并对最小二乘方法作了改进,消除系数矩阵的原理误差,给出了提高精度的方法。最后,提出了一个选择基函数的有效方法。     

INS 故障模型和推理方法的研究与设计

讨论了某型惯导 ( INS)设备的结构、工作流程和故障特点 ,分析了基于知识的专家系统 ( ES)常用的诊断模型和推理方法 ,在此基础上 ,设计了具体的基于对象的惯导综合层次模型及其推理机 .该模型和推理机已实际应用于该型 INS的故障诊断专家系统的设计     

监视器的可变行频电路设计

文中讨论了几种可变行频电路方案及其计算方法,通过实例计算和实验归纳了连续可变行频的设计要点。     

面向柔性加工环境的过程状态振动监测

本文运用提出的通用状态监测模型及策略,以振动信号监测为例,提取设备运行状态的振动信号方差和振动信号建立AR模型的参数估计的变化率参数作为两类通用特征参数,对柔性加工系统进行归一化监测,取得了良好的效果。建立的监测系统简洁、快速、可靠,满足柔性制造环境下设备运行状态监测的要求。     

紧固件用钢复验的动态抽验方案

本文针对现行紧固件原材料进厂抽样复验方法的不足,套改《ISO2859计数抽查程序和图表》,提出动态抽样方案,并对新旧方案实际应用进行了比较。以比较科学的决策,取得提高效益、降低消耗的结果.     

用填充函数法解决舰炮武器系统性能参数最佳化问题

本文研究的是舰炮武器系统的性能参数在满足一定的约束条件下,以什么样的匹配,可使舰炮武器系统的射击效力最佳,我们以多发射弹对目标的毁伤概率R_s(X)为目标函数,建立了数学模型。为了求解这样一个总体最优化问题,我们应用了填充函数的理论和方法,建立了算法,并扩充了一类填充函数的理论。通过在VA×11/780机上实际计算,获得了满意的结果,较好地解决了舰炮武器系统性能、参数的最佳化问题。