Mixed-model assembly systems (MMASs) have been well recognized for their ability to handle product variety for mass customization. With multiple products to produce, the prioritization of maintenance work-order becomes more crucial and challenging. This paper develops a quantitative method to systemccepted 21 December 2012 vailable online 4 February 2013

The prevalent formation of noncrystalline U(IV) species in the subsurface and their enhanced susceptibility to reoxidation and remobilization, as compared to crystalline uraninite, raise concerns about the long-term sustainability of the bioremediation of U-contaminated sites. The main goal of this study was to resolve the remaining uncertainty concerning the formation mechanism of noncrystalli...

An analysis of the Kimura 3ST model of DNA sequence evolution is given on the basis of its continuous Lie symmetries. The rate matrix commutes with a U(1)×U(1)×U(1) phase subgroup of the group GL(4) of 4× 4 invertible complex matrices acting on a linear space spanned by the 4 nucleic acid base letters. The diagonal ‘branching operator’ representing speciation is defined, and shown to intertwine...

Abstract Let f :=(f1, . . . , fn) be a sparse random polynomial system. This means that each f i has fixed support (list of possibly non-zero coefficients) and each coefficient has a Gaussian probability distribution of arbitrary variance. We express the expected number of roots of f inside a region U as the integral over U of a certain mixed volume form. When U = (C∗)n, the classical mixed vol...

Motivated by D-brane scenarios, we consider a non-supersymmetric model based on the gauge symmetry U (3) C ×U (3) L ×U (3) R which is equivalent to the SU (3) 3 " trinification " model supplemented by three U (1)s. Two U (1) combinations are anomalous while the third U (1) Z ′ is anomaly free and contributes to the hypercharge generator. This hypercharge embedding correspods to sin 2 θ W = 6 19...

For a fixed k, an oriented graph is k-transitive if it is acyclic and for every directed path p=u1→u2→...→uk+2 with k+2 vertices, p induces a clique if each of the two subpaths u1→u2→...→uk+1 and u2→...→uk+2 induces a clique. We describe an algorithm to find a maximum weight clique in a k-transitive graph. Consider a hereditary family G of graphs. A graph H(V,E) is called G-k-mixed if its edge ...

Researchers in science education have demonstrated that students can hold several different understandings of a single concept and apply them inconsistently to tasks related to the concept. Many studies have been conducted to investigate how these coexisting and competing understandings of concepts affect the process of conceptual development. Based on the context dependence of learning, we dev...

Monitoring fine particulate matter with diameters of less than 2.5 μm (PM2.5) is a critical endeavor in the Beijing–Tianjin–Hebei (BTH) region, which is one of the most polluted areas in China. Polar orbit satellites are limited by observation frequency, which is insufficient for understanding PM2.5 evolution. As a geostationary satellite, Himawari-8 can obtain hourly optical depths (AODs) and ...