115 research outputs found
Lying and walking surfaces for cattle, pigs and poultry and their impact on health, behaviour and performance
No full textAppropriate housing that promotes excellent health and high welfare for different livestock species is an essential aspect of sustainable animal production. The appropriate design of livestock buildings is a fast changing and ever improving professional endeavour. This book is set out to review the 'current best practice management' in relation to all key design elements of livestock buildings. It is important to manage these buildings correctly to generate environmental conditions that will enhance the health and welfare of livestock, the health of farm workers and people living near farming operations.
'Livestock housing' is written for all those who are involved in managing the health and welfare conditions of housed livestock on commercial farms, including farm workers, animal scientists, veterinarians, agricultural engineers and of course students. Contributions have been solicited from highly respected specialists from around the world. All key areas of housing management are reviewed, including feeding, watering, ventilation and waste management systems. Furthermore, issues such as the control of emissions, role of bedding, maintenance of hygiene, the management of thermal and aerial environment as well as the use of modern technological tools in the service of livestock management are discussed. This book provides a unique forum for leading international experts to convey up-to-date information to professionals involved in modern animal production
THE EFFECTIVE POTENTIAL OF AN M-MATRIX
No full textIn the presence of a confining potential V, the eigenfunctions of a continuous Schrödinger operator −∆ + V decay exponentially with the rate governed by the part of V which is above the corresponding eigenvalue; this can be quantified by a method of Agmon. Analogous localization properties can also be established for the eigenvectors of a discrete Schrödinger matrix. This note shows, perhaps surprisingly, that one can replace a discrete Schrödinger matrix by any real symmetric Z-matrix and still obtain eigenvector localization estimates. In the case of a real symmetric non-singular M-matrix A (which is a situation that arises in several contexts, including random matrix theory and statistical physics), the landscape function u = A −1 1 plays the role of an effective potential of localization. Starting from this potential, one can create an Agmon-type distance function governing the exponential decay of the eigenfunctions away from the "wells" of the potential, a typical eigenfunction being localized to a single such well
THE EFFECTIVE POTENTIAL OF AN M-MATRIX
No full textIn the presence of a confining potential V, the eigenfunctions of a continuous Schrödinger operator −∆ + V decay exponentially with the rate governed by the part of V which is above the corresponding eigenvalue; this can be quantified by a method of Agmon. Analogous localization properties can also be established for the eigenvectors of a discrete Schrödinger matrix. This note shows, perhaps surprisingly, that one can replace a discrete Schrödinger matrix by any real symmetric Z-matrix and still obtain eigenvector localization estimates. In the case of a real symmetric non-singular M-matrix A (which is a situation that arises in several contexts, including random matrix theory and statistical physics), the landscape function u = A −1 1 plays the role of an effective potential of localization. Starting from this potential, one can create an Agmon-type distance function governing the exponential decay of the eigenfunctions away from the "wells" of the potential, a typical eigenfunction being localized to a single such well
Entropy Production Of Entirely Diffusional Laplacian Transfer And The Possible Role Of Fragmentation Of The Boundaries
No full textThe Entropy Production And The Variational Functional Of A Laplacian Diffusional Field Around The First Four Fractal Iterations Of A Linear Self-Similar Tree (Von Koch Curve) Is Studied Analytically And Detailed Predictions Are Stated. In A Next Stage, These Predictions Are Confronted With Results From Numerical Resolution Of The Laplace Equation By Means Of Finite Elements Computations. After A Brief Review Of The Existing Results, The Range Of Distances Near The Geometric Irregularity, The So-Called »Near Field», A Situation Never Studied In The Past, Is Treated Exhaustively. We Notice Here That In The Near Field, The Usual Notion Of The Active Zone Approximation Introduced By Sapoval Et Al. [M. Filoche And B. Sapoval, Transfer Across Random Versus Deterministic Fractal Interfaces, Phys. Rev. Lett. 84(25) (2000) 5776;1 B. Sapoval, M. Filoche, K. Karamanos And R. Brizzi, Can One Hear The Shape Of An Electrode? I. Numerical Study Of The Active Zone In Laplacian Transfer, Eur. Phys. J. B. Condens. Matter Complex Syst. 9(4) (1999) 739-753.]2 Is Strictly Inapplicable. The Basic New Result Is That The Validity Of The Active-Zone Approximation Based On Irreversible Thermodynamics Is Confirmed In This Limit, And This Implies A New Interpretation Of This Notion For Laplacian Diffusional Fields
Pertinence et faisabilité de dispositifs d'accès et de partage des avantages en Outre-mer sur les ressources génétiques et les connaissances traditionnelles associées
No full textUniversal attractors of reversible aggregate-reorganization processes
No full textWe analyze a general class of reversible aggregate- reorganization processes. These processes are shown to exhibit globally attracting equilibrium distributions, which are universal, i.e., identical for large classes of models. Furthermore, the analysis implies that, for studies of equilibrium properties of any such process, computationally expensive reorganization dynamics such as random walks can be replaced by more efficient yet simpler methods. As a particular application, our results explain the recent observation of the formation of similar fractal aggregates from different initial structures by diffusive reorganization [ M. Filoche and B. Sapoval, Phys. Rev. Lett. 85, 5118 ( 2000)]
Simulation in optoelectronics : state of the art and trends
No full textDue to increasing needs of high performance devices for optical communication, CAD tools and especially numerical simulation have become a key point of the design. In this paper, we examine the latest methods used in these fields, and try to project their evolution during the next years
Entropy production of entirely diffusional laplacian transfer and the possible role of fragmentation of the boundaries
No full textThe entropy production and the variational functional of a Laplacian diffusional field around the first four fractal iterations of a linear self-similar tree (von Koch curve) is studied analytically and detailed predictions are stated. In a next stage, these predictions are confronted with results from numerical resolution of the Laplace equation by means of Finite Elements computations. After a brief review of the existing results, the range of distances near the geometric irregularity, the so-called »Near Field», a situation never studied in the past, is treated exhaustively. We notice here that in the Near Field, the usual notion of the active zone approximation introduced by Sapoval et al. [M. Filoche and B. Sapoval, Transfer across random versus deterministic fractal interfaces, Phys. Rev. Lett. 84(25) (2000) 5776;1 B. Sapoval, M. Filoche, K. Karamanos and R. Brizzi, Can one hear the shape of an electrode? I. Numerical study of the active zone in Laplacian transfer, Eur. Phys. J. B. Condens. Matter Complex Syst. 9(4) (1999) 739-753.]2 is strictly inapplicable. The basic new result is that the validity of the active-zone approximation based on irreversible thermodynamics is confirmed in this limit, and this implies a new interpretation of this notion for Laplacian diffusional fields. © 2015 World Scientific Publishing Company
Entropy production of entirely diffusional Laplacian transfer and the possible role of fragmentation of the boundaries
No full textThe entropy production and the variational functional of a Laplacian diffusional field around the first four fractal iterations of a linear self-similar tree (von Koch curve) is studied analytically and detailed predictions are stated. In a next stage, these predictions are confrontedwith results from numerical resolution of the Laplace equation by means of Finite Elements computations. After a brief review of the existing results, the range of distances near the geometric irregularity, the so-called “Near Field”, a situation never studied in the past, is treated exhaustively. We notice here that in the Near Field, the usual notion of the active zone approximation introduced by Sapoval et al. [M. Filoche and B. Sapoval, Transfer across random versus deterministic fractal interfaces, Phys. Rev. Lett. 84(25) (2000) 5776; B. Sapoval, M. Filoche, K. Karamanos and R. Brizzi, Can one hear the shape of an electrode? I. Numerical study of the active zone in Laplacian transfer, Eur. Phys. J. B. Condens. Matter Complex Syst. 9(4) (1999) 739-753.] is strictly inapplicable. The basic new result is that the validity of the active-zoneapproximation based on irreversible thermodynamics is confirmed in this limit, and this implies a new interpretation of this notion for Laplacian diffusional fields.SCOPUS: ar.jinfo:eu-repo/semantics/publishe
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