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1. |
Record Nr. |
UNINA990007279050403321 |
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Autore |
Cosci, Stefania |
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Titolo |
L'introduzione del deposito previo nella funzione delle importazioni / Stefania Cosci |
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Pubbl/distr/stampa |
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Collocazione |
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Lingua di pubblicazione |
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Formato |
Materiale a stampa |
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Livello bibliografico |
Monografia |
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2. |
Record Nr. |
UNINA9910300141603321 |
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Autore |
Bellout Hamid |
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Titolo |
Incompressible Bipolar and Non-Newtonian Viscous Fluid Flow [[electronic resource] /] / by Hamid Bellout, Frederick Bloom |
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Pubbl/distr/stampa |
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Cham : , : Springer International Publishing : , : Imprint : Birkhäuser, , 2014 |
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ISBN |
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Edizione |
[1st ed. 2014.] |
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Descrizione fisica |
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1 online resource (583 p.) |
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Collana |
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Advances in Mathematical Fluid Mechanics, , 2297-0320 |
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Disciplina |
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Soggetti |
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Mathematical physics |
Partial differential equations |
Fluids |
Mathematical Physics |
Partial Differential Equations |
Fluid- and Aerodynamics |
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Lingua di pubblicazione |
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Formato |
Materiale a stampa |
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Livello bibliografico |
Monografia |
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Note generali |
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Description based upon print version of record. |
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Nota di bibliografia |
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Includes bibliographical references and index. |
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Nota di contenuto |
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Preface -- Acknowledgements -- I Incompressible Multipolar Fluid Dynamics -- II Plane Poiseuille Flow of Incompressible Bipolar Viscous Fluids -- III Incompressible Bipolar Fluid Dynamics: Examples of Other |
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Flows and Geometries -- IV General Existence and Uniqueness Theorems for Incompressible Bipolar and non-Newtonian Fluid Flow -- V Attractors for Incompressible Bipolar and non-Newtonian Flows: Bounded Domains and Space Periodic Problems -- VI Inertial Manifolds, Orbit Squeezing, and Attractors for Bipolar Flow in Unbounded Channels -- A.I Notation, Definitions, and Results from Analysis -- A.II Estimates Involving the Rate of Deformation Tensor -- A.III The Spectral Gap Condition -- Bibliography -- Index. |
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Sommario/riassunto |
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The theory of incompressible multipolar viscous fluids is a non-Newtonian model of fluid flow, which incorporates nonlinear viscosity, as well as higher order velocity gradients, and is based on scientific first principles. The Navier-Stokes model of fluid flow is based on the Stokes hypothesis, which a priori simplifies and restricts the relationship between the stress tensor and the velocity. By relaxing the constraints of the Stokes hypothesis, the mathematical theory of multipolar viscous fluids generalizes the standard Navier-Stokes model. The rigorous theory of multipolar viscous fluids is compatible with all known thermodynamical processes and the principle of material frame indifference; this is in contrast with the formulation of most non-Newtonian fluid flow models which result from ad hoc assumptions about the relation between the stress tensor and the velocity. The higher-order boundary conditions, which must be formulated for multipolar viscous flow problems, are a rigorous consequence of the principle of virtual work; this is in stark contrast to the approach employed by authors who have studied the regularizing effects of adding artificial viscosity, in the form of higher order spatial derivatives, to the Navier-Stokes model. A number of research groups, primarily in the United States, Germany, Eastern Europe, and China, have explored the consequences of multipolar viscous fluid models; these efforts, and those of the authors, which are described in this book, have focused on the solution of problems in the context of specific geometries, on the existence of weak and classical solutions, and on dynamical systems aspects of the theory. This volume will be a valuable resource for mathematicians interested in solutions to systems of nonlinear partial differential equations, as well as to applied mathematicians, fluid dynamicists, and mechanical engineers with an interest in the problems of fluid mechanics. |
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3. |
Record Nr. |
UNINA9910797163103321 |
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Autore |
Hayes Michael D. |
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Titolo |
Fractography in failure analysis of polymers / / Michael D. Hayes, Dale B. Edwards, Anand R. Shah |
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Pubbl/distr/stampa |
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Amsterdam, [Netherlands] : , : William Andrew, , 2015 |
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©2015 |
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ISBN |
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Descrizione fisica |
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1 online resource (253 p.) |
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Collana |
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Disciplina |
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Soggetti |
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Materials - Fatigue |
Polymers - Fracture |
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Lingua di pubblicazione |
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Formato |
Materiale a stampa |
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Livello bibliografico |
Monografia |
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Note generali |
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Description based upon print version of record. |
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Nota di bibliografia |
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Includes bibliographical references and index. |
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Nota di contenuto |
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Front Cover; Fractography in Failure Analysis of Polymers; Copyright Page; Contents; Foreword; Preface; Acknowledgments; 1 Introduction; 1.1 Motivations; 1.2 What Is Fractography?; 1.3 Plastic Material Structure-Property Relationship; 1.4 Components of a Failure Investigation; References; 2 Fractography as a Failure Analysis Tool; 2.1 Failure Analysis Fundamentals; 2.1.1 Causes Versus Mechanisms; 2.1.2 Primary Versus Secondary Causes; 2.1.3 Types of Root Causes; 2.1.4 Defects Versus Imperfections; 2.1.5 Deficiencies in Design and Material Selection; 2.2 The Scientific Method |
2.2.1 Deductive Versus Inductive Reasoning and Fallacies2.3 Application of the Scientific Method; 2.3.1 Multidisciplinary Approach; 2.3.2 The Litigation Standard; 2.4 The Role of Fractography in Failure Analysis; References; 3 Instrumentation and Techniques; 3.1 Field or Site Instrumentation and Techniques; 3.1.1 Information Gathering; 3.1.2 Visual Inspection for Product Specific Information; 3.1.3 Visual ("Naked Eye") and Photographic Techniques; 3.1.4 Field Microscopy; 3.1.5 Photogrammetry and Digitization; 3.2 Microscopic Examination of Fracture Surfaces in a Laboratory |
3.2.1 Optical Microscopy3.2.2 Scanning Electron Microscopy; 3.2.2.1 Environmental SEM; 3.3 Consideration and Selection of Instruments in Failure Analysis; 3.4 Summary; 3.5 Regulatory Agencies; References; 4 Fractography Basics; 4.1 Fracture Surface Features and Interpretation; |
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4.1.1 What Failure Characteristics Are Normally Associated with This Material?; 4.1.2 What Is the Location and Nature of the Fracture Origin?; 4.1.3 Is the Fracture Surface Brittle or Ductile-How Ductile?; 4.1.4 Is the Fracture Surface Smooth or Rough, Dull or Glossy? |
4.1.5 Is Stress Whitening Present Anywhere on the Fracture Surface?4.1.6 What Is the Nature of Striations and Other Marks on the Fracture Surface-Was the Fracture Fast or Slow?; 4.1.7 Do the Mating Halves of the Fracture Show the Same Crack Direction?; 4.1.8 Is the Crack Straight or Curved?; 4.1.9 Are There Branches, Bifurcations, or T-Junctions of the Crack in the Part?; 4.1.10 Are Both SCG and Fast Fracture Areas Present on the Fracture Surface?; 4.1.11 Is There Any Foreign Material or Chemical Evident on the Surface?; 4.2 Brittle Versus Ductile Failures in Polymers |
4.2.1 Plane Stress and Plane Strain4.2.2 Cautions; 4.3 Crack Path Analysis; 4.4 Fracture Features; 4.4.1 Fracture Origin(s); 4.4.2 Mirror Zone; 4.4.3 Mist Region; 4.4.4 Rib Markings/Beach Marks; 4.4.5 Hackles; 4.4.6 River Patterns or River Markings; 4.4.7 Wallner Lines; 4.4.8 Fatigue Striations; 4.4.8.1 Fatigue Crack Growth Versus SCG; 4.4.9 Conic or Parabolic Markings; 4.4.10 Ratchet Marks or Ledges; 4.5 Application of Fractography to Failure Analysis; References; 5 Long-Term Failure Mechanisms in Plastics; 5.1 Introduction; 5.2 Creep; 5.3 SCG/Creep Rupture; 5.4 Environmental Stress Cracking |
5.4.1 Differentiating SCG/Creep from ESC |
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Sommario/riassunto |
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Fractography in Failure Analysis of Polymers provides a practical guide to the science of fractography and its application in the failure analysis of plastic components. In addition to a brief background on the theory of fractography, the authors discuss the various fractographic tools and techniques used to identify key fracture characteristics. Case studies are included for a wide range of polymer types, applications, and failure modes, as well as best practice guidelines enabling engineers to apply these lessons to their own work. Detailed images and their appropriate context are presen |
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