考虑牛鞭效应与反牛鞭效应联合作用在不完美信息下供应链决策者的合作博弈与演进

理性假设下,供应链运作过程中出现牛鞭效应也会出现反牛鞭效应,在考虑牛鞭效应与反牛鞭效应联合作用下分别构建二级供应链合作博弈模型与n级供应链合作博弈模型,得到Nash均衡策略,构建合作Nash均衡下供应链上订货模型,并通过数值算例验证订货模型及牛鞭效应特性与反牛鞭效应特性交替作用的最优化局势优于传统视角的消除牛鞭效应带来的供应链优化.研究表明:供应链上下游在周期内表现出牛鞭效应特性与反牛鞭效应特性的交替作用,会使得供应链整体上市场需求偏差减少、运作成本降低.贡献在于给出消除牛鞭效应的新思路,从整体上消除牛鞭效应或反牛鞭效应,使得整条供应链不管是短期的还是长期都是最优的,在长期还会给供应链企业带来显著的战略优势.     

天然气吸附剂的开发及其储气性能的研究——Ⅰ-吸附剂制备与体积法评定吸附剂的储气性能

报道了天然气吸附剂的基本制备技术,并采用体积法评定了吸附剂的储气性能。结果表明,采用作者开发的吸附剂制备工艺可获得性能优良的天然气吸附剂。以木质素为原料制备的粉状吸附剂,其比表面积可达２９１２ｍ２／ｇ,微孔体积可达１－４８ｃｍ３／ｇ,平均孔径为１－４８ｎｍ ,堆密度为０－３０ｇ／ｃｍ３ 。在６－０ＭＰａ、２５ ℃下,天然气的吸附储存量可达到１４０Ｖ／Ｖ。天然气吸附剂的储气性能与其比表面、微孔数量、填充密度等参数有重要关系     

Minimum norm solution to the positive semidefinite linear complementarity problem

In this article, we present an algorithm to compute the minimum norm solution of the positive semidefinite linear complementarity problem. We show that its solution can be obtained using the alternative theorems and a convenient characterization of the solution set of a convex quadratic programming problem. This problem reduces to an unconstrained minimization problem with once differentiable convex objective function. We propose an extension of Newton's method for solving the unconstrained optimization problem. Computational results show that convergence to high accuracy often occurs in just a few iterations.     

KKT conditions for weak compact convex sets,theorems of the alternative,and optimality conditions

We present several equivalent conditions for the Karush–Kuhn–Tucker conditions for weak^? compact convex sets. Using them, we extend several existing theorems of the alternative in terms of weak^? compact convex sets. Such extensions allow us to express the KKT conditions and hence necessary optimality conditions for more general nonsmooth optimization problems with inequality and equality constraints. Furthermore, several new equivalent optimality conditions for optimization problems with inequality constraints are obtained.     

As(III) Determination in the Presence of Pb(II) by Differential Alternative Pulses Voltammetry

Differential Alternative Pulses Voltammetry (DAPV), introduced by the authors earlier, was applied with HMDE for direct As(III) determination in the presence of Pb(II) in natural water without sample pretreatment. Distinguishable peaks of As(III) and Pb(II) were registered in 1 M HCl supporting electrolyte at a concentration ratio as high as 1 : 6, while complete peak overlapping occurs applying DPP at any concentration ratio at the same experimental conditions. In‐situ As(III) determinations in the presence of Pb(II) in contaminated ground waters in Mexico were performed, using especially designed disposable safe mercury drop electrodes.     

Nonfinitely Based Varieties of Right Alternative Metabelian Algebras

Since 1976, it is known from the paper by V. P. Belkin that the variety RA₂ of right alternative metabelian (solvable of index 2) algebras over an arbitrary field is not Spechtian (contains nonfinitely based subvarieties). In 2005, S. V. Pchelintsev proved that the variety generated by the Grassmann RA₂-algebra of finite rank r over a field ?, for char(?) ≠ 2, is Spechtian iff r = 1. We construct a nonfinitely based variety 𝔐 generated by the Grassmann 𝒱-algebra of rank 2 of certain finitely based subvariety 𝒱 ? RA₂ over a field ?, for char(?) ≠ 2, 3, such that 𝔐 can also be generated by the Grassmann envelope of a five-dimensional superalgebra with one-dimensional even part.     

Marriage Partner Selection in Kuwait: An Analytical Hierarchy Process Approach

The decision to marry is one of the most critical decisions in young ladie' lives where wrong choices may have adverse effects. This study investigates this issue in developing countries using the small state of Kuwait as a manageable case study. This research utilizes the analytical hierarchy process (AHP) due to the multiplicity of objectives. Women from different ethnic, religious, and residential backgrounds were surveyed. The problem considers eight criteria and four alternatives (male candidates). It was found from the study that the most preferred criteria are personality, followed by marital status and religious status, respectively.     

First Order System of Equations of Mixed Type and Second Order Equation of Mixed Type

A system of first order equations of mixed type, which may be reduced to a general second order equation of mixed type, is considered. Uniqueness of solution to the generalized Tricomi problem is proved by the method of auxiliary function. Existence of H¹ strong solution is based on a characteristic problem and is proved by the Fredholm's alternative properties.     

化学学习中记忆的7种缺陷

记忆是学生进行其他认知活动的基础,因记忆容量以及保持时间等限制具有一些缺陷,表现为分心、暗示、健忘、纠缠、空白、错认、偏颇等7种类型。记忆缺陷影响着学生的化学学习,了解化学学习中学生记忆的7种缺陷,可以精准地把握学生化学学习产生困难的原因,并采取一定的教学方法改进教学。