非合作n人投标报价服从N(μ,σ~2)分布时局中人投标报价策略的研究

推导了矩阵对策模型 ,对非合作 n人投标报价的分布进行 x2 检验。当非合作 n人投标报价服从N (μ,σ2 )分布时 ,根据参数区间公式 ,估计非合作 n人有效报价平均数的范围 ,局中人 最佳报价可根据矩阵对策模型来确定。该方法确定的报价与最佳标底的误差能控制在较小的范围内 ,适用于招标中合成标底的评标办法 ,对确定报价具有一定的实用价值。     

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.     

Faster GC analyses performed by flow programming in short capillary columns

The technique of programming the carrier gas flow rate in gas chromatography, especially in connection with the use of capillary columns shorter than 10 m can significantly accelerate GC analyses. Equations for calculation of the parameters of the exponential flow function and retention data are described. The effects of flow programming in a short capillary column are shown in a few chromatograms. Different programming rates are tested and compared with temperature programming.     

Asset-selling problem with an uncertain deadline,quitting offer,and search skipping option

This paper presents a discrete-time sequential stochastic asset-selling problem with an infinite planning horizon, where the process of selling the asset may reach a deadline at any point in time with a probability. It is assumed that a quitting offer is available at every point in time and search skipping is permitted. Thus, decisions must be made as to whether or not to accept the quitting offer, to accept an appearing buyer’s offer, and to conduct a search for a buyer. The main purpose of this paper is to clarify the properties of the optimal decision rules in relation to the model’s parameters.     

四明山国家森林公园野生植物资源的开发利用与保护对策

四明山国家森林公园自然条件优越，森林覆盖率高，野生植物资源蕴藏丰富，有高等植物1226种，隶属于164科．根据用途可将它们分为食用、药用、观赏、工业用、饲料植物五大类，其中食用植物共有257种，占总数的20．96％；药用植物共有588种，占总数的47．96％；观赏植物共有383种。占31．24％：工业用植物共有342种，占总数的27．90％；饲料植物共81种，占6．60％．通过对四明山国家森林公园野生植物资源情况和利用现状的调查，提出合理开发利用园内野生植物资源的建议．同时由于人们尚未对野生植物有较好的保护意识，对一些已具商品价值的野生植物随意采集和肆意破坏，造成一些物种的不断减少，有的甚至濒临灭绝．我们就此提出一些保护对策，希望在保护前提下较好地开发利用这些野生植物资源，使这些野生植物资源得到永续利用．