scholarly journals Crystalline orientation assessment in transversely isotropic semicrystalline polymer: Application to oedometric compaction of PTFE

2020 ◽  
Author(s):  
Gabriel Guenoun ◽  
Nicolas Schmitt ◽  
Stéphane Roux ◽  
Gilles Régnier
Keyword(s):  
Transversely Isotropic ◽  
Semicrystalline Polymer ◽  
Crystalline Orientation ◽  
Polymer Application

Applications of Photoelectron Microscopy

1976 ◽  
Vol 34 ◽  
pp. 506-507
Author(s):  
William J. Baxter
Keyword(s):  
Electron Microscopy ◽  
Thermal Decomposition ◽  
Chemical Composition ◽  
Ultraviolet Radiation ◽  
Thin Layer ◽  
Edge Effects ◽  
Electron Optics ◽  
Surface Layers ◽  
Crystalline Orientation ◽  
Fluorescent Screen

In this form of electron microscopy, photoelectrons emitted from a metal by ultraviolet radiation are accelerated and imaged onto a fluorescent screen by conventional electron optics. image contrast is determined by spatial variations in the intensity of the photoemission. The dominant source of contrast is due to changes in the photoelectric work function, between surfaces of different crystalline orientation, or different chemical composition. Topographical variations produce a relatively weak contrast due to shadowing and edge effects.Since the photoelectrons originate from the surface layers (e.g. ∼5-10 nm for metals), photoelectron microscopy is surface sensitive. Thus to see the microstructure of a metal the thin layer (∼3 nm) of surface oxide must be removed, either by ion bombardment or by thermal decomposition in the vacuum of the microscope.

Comparative Studies of Crystalline Orientation and Morphology of Injection Molded Polyolefin Parts

2008 ◽  
Vol XXIV (04) ◽  
pp. 334-345
Author(s):  
J. Suh ◽  
J. L. White ◽  
K. Ban
Keyword(s):  
Comparative Studies ◽  
Crystalline Orientation ◽  
Injection Molded

Dewatering polymer application in an iron ore tailings dam

2020 ◽  
Author(s):  
Frederic Braga ◽  
Raymond Guang ◽  
Junio Pereira ◽  
Jorge Davo
Keyword(s):  
Iron Ore ◽  
Tailings Dam ◽  
Iron Ore Tailings ◽  
Polymer Application

The analysis of dynamic response of transversely isotropic subgrade based on FWD

2013 ◽  
Vol 30 (2) ◽  
pp. 195-199
Author(s):  
Zhenfeng Li ◽  
Min Zhang
Keyword(s):  
Dynamic Response ◽  
Transversely Isotropic

Reverse time migration in tilted transversely isotropic media

2020 ◽  
Vol 38 (2) ◽  
Author(s):  
Razec Cezar Sampaio Pinto da Silva Torres ◽  
Leandro Di Bartolo
Keyword(s):  
Seismic Anisotropy ◽  
Synthetic Data ◽  
Transversely Isotropic ◽  
Reverse Time ◽  
Reverse Time Migration ◽  
Computer Clusters ◽  
Time Migration ◽  
Transversely Isotropic Media ◽  
Isotropic Media ◽  
Tti Media

ABSTRACT. Reverse time migration (RTM) is one of the most powerful methods used to generate images of the subsurface. The RTM was proposed in the early 1980s, but only recently it has been routinely used in exploratory projects involving complex geology – Brazilian pre-salt, for example. Because the method uses the two-way wave equation, RTM is able to correctly image any kind of geological environment (simple or complex), including those with anisotropy. On the other hand, RTM is computationally expensive and requires the use of computer clusters. This paper proposes to investigate the influence of anisotropy on seismic imaging through the application of RTM for tilted transversely isotropic (TTI) media in pre-stack synthetic data. This work presents in detail how to implement RTM for TTI media, addressing the main issues and specific details, e.g., the computational resources required. A couple of simple models results are presented, including the application to a BP TTI 2007 benchmark model.Keywords: finite differences, wave numerical modeling, seismic anisotropy. Migração reversa no tempo em meios transversalmente isotrópicos inclinadosRESUMO. A migração reversa no tempo (RTM) é um dos mais poderosos métodos utilizados para gerar imagens da subsuperfície. A RTM foi proposta no início da década de 80, mas apenas recentemente tem sido rotineiramente utilizada em projetos exploratórios envolvendo geologia complexa, em especial no pré-sal brasileiro. Por ser um método que utiliza a equação completa da onda, qualquer configuração do meio geológico pode ser corretamente tratada, em especial na presença de anisotropia. Por outro lado, a RTM é dispendiosa computacionalmente e requer o uso de clusters de computadores por parte da indústria. Este artigo apresenta em detalhes uma implementação da RTM para meios transversalmente isotrópicos inclinados (TTI), abordando as principais dificuldades na sua implementação, além dos recursos computacionais exigidos. O algoritmo desenvolvido é aplicado a casos simples e a um benchmark padrão, conhecido como BP TTI 2007.Palavras-chave: diferenças finitas, modelagem numérica de ondas, anisotropia sísmica.

ELASTIC PROPERTIES OF 3D PRINTED FRACTURE MODEL WITH TRANSVERSELY ISOTROPIC BACKGROUND

2020 ◽  
Author(s):  
Lingyun Kong ◽  
◽  
Mehdi Ostadhassan ◽  
Junxin Guo
Keyword(s):  
Elastic Properties ◽  
Transversely Isotropic ◽  
Fracture Model ◽  
3D Printed
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