8,748 research outputs found

    Maintaining the safety and quality of beef carcass meat

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    Contamination of animal carcasses during slaughtering procedures is undesirable, but unavoidable in the conversion of live animals to meat for consumption. Internal muscle tissues are essentially sterile, and most initial contamination of red meat carcasses is contributed by the hide during removal (Elmonssalami and Wassef, 1971; Gill and Penny, 1979; Gill et al., 1976). The exposed surface of the hide and the hair accumulate dust, dirt and faecal material, and this is the primary source of bacterial contamination during slaughter (Ayres, 1955; Shotts et al., 1961). The factors that affect the extent of this contamination are reviewed by Patterson (1969) and Grau et al. (1968). Much of the microflora transferred to the tissue surfaces, while aesthetically undesirable, is nonpathogenic; however, pathogens such as Salmonella, Campylobacter and pathogenic Escherichia coli can be present

    Inclusive by design: transformative services and sport-event accessibility

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    © 2016 Informa UK Limited, trading as Taylor & Francis Group. This paper examines the service dimensions required to be inclusive of people with access needs within a major-sport event context. The United Nations Convention on the Rights of Persons with Disabilities seeks to counter disability discrimination and enable citizenship rights of people with disabilities, including access to goods and services, across all dimensions of social participation including major-sport events (e.g. Olympic and Paralympic Games, world cups in football, cricket and rugby union). Providing for people with disability and access needs is also an emerging tourism focus with initiatives addressing accessible tourism included in the World Tourism Organizations mission and recent strategic destination plans. To enhance the understanding of service delivery for an accessible tourism market in a major-sport event context, a case study of the Vancouver Fan Zone for the FIFA Womens World Cup Canada, 2015 TM is analyzed through the lens of transformative services. From this analysis future research directions are identified to benefit those with access needs who wish to participate in major-sport events

    Integral closure of rings of integer-valued polynomials on algebras

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    Let DD be an integrally closed domain with quotient field KK. Let AA be a torsion-free DD-algebra that is finitely generated as a DD-module. For every aa in AA we consider its minimal polynomial μa(X)∈D[X]\mu_a(X)\in D[X], i.e. the monic polynomial of least degree such that μa(a)=0\mu_a(a)=0. The ring IntK(A){\rm Int}_K(A) consists of polynomials in K[X]K[X] that send elements of AA back to AA under evaluation. If DD has finite residue rings, we show that the integral closure of IntK(A){\rm Int}_K(A) is the ring of polynomials in K[X]K[X] which map the roots in an algebraic closure of KK of all the μa(X)\mu_a(X), a∈Aa\in A, into elements that are integral over DD. The result is obtained by identifying AA with a DD-subalgebra of the matrix algebra Mn(K)M_n(K) for some nn and then considering polynomials which map a matrix to a matrix integral over DD. We also obtain information about polynomially dense subsets of these rings of polynomials.Comment: Keywords: Integer-valued polynomial, matrix, triangular matrix, integral closure, pullback, polynomially dense set. accepted for publication in the volume "Commutative rings, integer-valued polynomials and polynomial functions", M. Fontana, S. Frisch and S. Glaz (editors), Springer 201

    Nets, relations and linking diagrams

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    In recent work, the author and others have studied compositional algebras of Petri nets. Here we consider mathematical aspects of the pure linking algebras that underly them. We characterise composition of nets without places as the composition of spans over appropriate categories of relations, and study the underlying algebraic structures.Comment: 15 pages, Proceedings of 5th Conference on Algebra and Coalgebra in Computer Science (CALCO), Warsaw, Poland, 3-6 September 201

    Mixed-mode oscillations and interspike interval statistics in the stochastic FitzHugh-Nagumo model

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    We study the stochastic FitzHugh-Nagumo equations, modelling the dynamics of neuronal action potentials, in parameter regimes characterised by mixed-mode oscillations. The interspike time interval is related to the random number of small-amplitude oscillations separating consecutive spikes. We prove that this number has an asymptotically geometric distribution, whose parameter is related to the principal eigenvalue of a substochastic Markov chain. We provide rigorous bounds on this eigenvalue in the small-noise regime, and derive an approximation of its dependence on the system's parameters for a large range of noise intensities. This yields a precise description of the probability distribution of observed mixed-mode patterns and interspike intervals.Comment: 36 page
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