Apresentação do professor Pedro Grande, da seção UFRGS do Instituto Nacional de Engenharia de Superfície. Palestra convidada do Simpósio Engenharia de Superfície do X Encontro da SBPMAT. Realizada no dia 26 de setembro de 2011 em Gramado (RS).
Using potential field data and stochastic optimisation to refine 3D geologica...Richard Lane
“Using potential field data and stochastic optimisation to refine 3D geological models” by Richard Lane (Geoscience Australia, richard.lane@ga.gov.au), Phil McInerney (Intrepid Geophysics, phil@intrepid-geophysics.com), Ray Seikel (Intrepid Geophysics, ray@intrepid-geophysics.com), and Antonio Guillen (BRGM and Intrepid Geophysics, a.guillen@brgm.fr). Paper presented at the Geophysics Session, PDAC, Tuesday, March 4 2008, Toronto, Canada. Abstract : As a geoscience agency, Geoscience Australia has sought a platform that allows us to integrate complimentary but diverse sources of information into consistent products. Several groups have made progress by blending 3D geological mapping and potential field modelling. We describe the approach implemented in GeoModeller software and illustrate typical workflows using a synthetic example and a case study involving the San Nicolas volcanogenic massive sulphide deposit. Starting with an initial 3D geological map, typically based on sparse surface observations, we utilise potential field data to investigate the viability of the proposed configuration of geological units at depth. Forward modelling of the property distribution derived from the 3D geological map and supplied rock property estimates allows us to simulate any of the gravity and magnetic fields or their associated vector or gradient tensor components. A visual comparison of the calculated and observed potential field data provides immediate feedback on the consistency between the 3D geological map and the observed potential field data. We may also use a bounded property optimisation procedure to derive an alternate combination of properties for the geological units (i.e., the combination that would best reproduce the supplied potential field observations). A review of the results obtained with these two simple procedures is used to identify any significant changes that are required for the 3D geological map or our estimates of the properties. Several iterations of geological mapping, forward modelling and property optimisation are generally required to derive a “reasonable” candidate 3D geological map for further consideration. At this point, a powerful geometry optimisation procedure can be used to fully invert the potential field data. The ambiguity that is inherent in this process is reduced by simultaneously inverting any number of gravity and magnetic data types and by doing so with strong geological constraints. The procedure utilises random elements and statistical decision rules to produce a large number of viable models, in contrast to the more common deterministic approach that results in a single “best” model. Statistical techniques are then used to analyse the acceptable models and identify important features of the 3D geological maps that are consistent with both geological and geophysical observations.
Materials need to meet structural, thermal, and electromagnetic and transport property requirements simultaneously for various new applications. This presentation provides an overview of multiphysics design of materials with special reference to composites using micromechanics. The unitcell modeling and property prediction methodology are detailed. The elastic modulus, thermal conductivity, diffusion coefficient prediction method and results are reported. A two stage sequentially coupled method is also outlined for accelerated application and material development for metamaterials. Composite processing related micromechanical models to predict permeability is also reported. The material properties related to product and process design aspect of fiber reinforced and cellular composites are highlighted.
Deflagration in Magnetism, J. Tejada, A. Hernández-Mínguez, F. Macià, S. Vélez and J.M. Hernández
Grup de Magnetisme, Dept. de Física Fonamental, Universitat de Barcelona
Using potential field data and stochastic optimisation to refine 3D geologica...Richard Lane
“Using potential field data and stochastic optimisation to refine 3D geological models” by Richard Lane (Geoscience Australia, richard.lane@ga.gov.au), Phil McInerney (Intrepid Geophysics, phil@intrepid-geophysics.com), Ray Seikel (Intrepid Geophysics, ray@intrepid-geophysics.com), and Antonio Guillen (BRGM and Intrepid Geophysics, a.guillen@brgm.fr). Paper presented at the Geophysics Session, PDAC, Tuesday, March 4 2008, Toronto, Canada. Abstract : As a geoscience agency, Geoscience Australia has sought a platform that allows us to integrate complimentary but diverse sources of information into consistent products. Several groups have made progress by blending 3D geological mapping and potential field modelling. We describe the approach implemented in GeoModeller software and illustrate typical workflows using a synthetic example and a case study involving the San Nicolas volcanogenic massive sulphide deposit. Starting with an initial 3D geological map, typically based on sparse surface observations, we utilise potential field data to investigate the viability of the proposed configuration of geological units at depth. Forward modelling of the property distribution derived from the 3D geological map and supplied rock property estimates allows us to simulate any of the gravity and magnetic fields or their associated vector or gradient tensor components. A visual comparison of the calculated and observed potential field data provides immediate feedback on the consistency between the 3D geological map and the observed potential field data. We may also use a bounded property optimisation procedure to derive an alternate combination of properties for the geological units (i.e., the combination that would best reproduce the supplied potential field observations). A review of the results obtained with these two simple procedures is used to identify any significant changes that are required for the 3D geological map or our estimates of the properties. Several iterations of geological mapping, forward modelling and property optimisation are generally required to derive a “reasonable” candidate 3D geological map for further consideration. At this point, a powerful geometry optimisation procedure can be used to fully invert the potential field data. The ambiguity that is inherent in this process is reduced by simultaneously inverting any number of gravity and magnetic data types and by doing so with strong geological constraints. The procedure utilises random elements and statistical decision rules to produce a large number of viable models, in contrast to the more common deterministic approach that results in a single “best” model. Statistical techniques are then used to analyse the acceptable models and identify important features of the 3D geological maps that are consistent with both geological and geophysical observations.
Materials need to meet structural, thermal, and electromagnetic and transport property requirements simultaneously for various new applications. This presentation provides an overview of multiphysics design of materials with special reference to composites using micromechanics. The unitcell modeling and property prediction methodology are detailed. The elastic modulus, thermal conductivity, diffusion coefficient prediction method and results are reported. A two stage sequentially coupled method is also outlined for accelerated application and material development for metamaterials. Composite processing related micromechanical models to predict permeability is also reported. The material properties related to product and process design aspect of fiber reinforced and cellular composites are highlighted.
Deflagration in Magnetism, J. Tejada, A. Hernández-Mínguez, F. Macià, S. Vélez and J.M. Hernández
Grup de Magnetisme, Dept. de Física Fonamental, Universitat de Barcelona
Presentation at "Emerging problems in particle phenomenology" workshop held at CUNY on April 11, 2010. Has sensitivity of Jets+MET searches for 7 TeV LHC.
Lecture 7 of BIOS 203 mini-course taught by Heather Kulik at Stanford University. Rare event techniques. http://bios203.stanford.edu or email bios203.course@gmail.com for more information.
Apresentação do Dr. Felipe de Campos Carreri (ISIEngenharia de Superfícies) no 1° Workshop de Tecnologias a Plasma para o Setor Automotivo, realizado em Belo Horizonte (MG) em 3 de agosto de 2017, pelo ISI de Engenharia de Superfícies (participante do Instituto Nacional de Engenharia de Superfícies).
Apresentação de Prof. José Rubens Gonçalves Carneiro (PUC Minas) no 1° Workshop de Tecnologias a Plasma para o Setor Automotivo, realizado em Belo Horizonte (MG) em 3 de agosto de 2017, pelo Instituto SENAI de Inovação em Engenharia de Superfícies (participante do Instituto Nacional de Engenharia de Superfícies).
Seminário proferido na Universidade de Caxias do Sul em junho de 2017 para estudantes de graduação e pós-graduação pelo prof. Carlos A. Figueroa, pesquisador da seção UCS do Instituto.
Palestra proferida na seção UCS do Instituto em 04/04/17 por Felipe de Campos Carreri, pesquisador no Instituto SENAI de Inovação em Engenharia de Superfícies, Belo Horizonte. Diversos produtos e materiais com quem todos temos contato no dia-a-dia se devem à inovações na área de Engenharia de Superfícies. A necessidade de inovar se torna cada vez mais clara às indústrias que desejam se manter competitivas e presentes no mercado. Porém, em muitos casos, as demandas por parte da indústria por novas funcionalidades e propriedades de materiais está à frente da maturidade das tecnologias em nível de pesquisa básica, tornando mais desafiadora a pesquisa aplicada para o desenvolvimento de novos produtos. Esta apresentação tem como objetivo, apresentar algumas destas demandas à comunidade acadêmica, incentivando esforços para pesquisa básica em alguns pontos chave, de forma a facilitar no futuro a aplicação de novas tecnologias. Serão apresentadas também algumas tendências e exemplos de casos onde vêm ocorrendo inovações significativas, especialmente na área de tecnologias de plasma para modificação de superfícies. As tendências mostram um aumento da multidisciplinariedade na área, criando interações entre engenharia de materiais, engenharia mecânica, elétrica e computação de forma a criar equipamentos e processos inovadores.
Seminário proferido pelo pesquisador Thiago Burgo (Unicamp) em 26 de agosto de 2015 para cerca de 20 estudantes e professores, na seção UCS (Caxias do Sul, RS) do Instituto Nacional de Engenharia de Superfícies.
Seminário apresentado pelo professor Vladimir Trava Airoldi, da seção INPE do Instituto Nacional de Engenharia de Superfícies, em Caxias do Sul, na seção UCS do Instituto, no dia 4 de agosto de 2015, para cerca de 20 estudantes e professores.
Resumo de trabalho sobre o fenômeno de superlubrificação entre superfícies cerâmicas realizado no Laboratório de Fenômenos de Superfície, associado ao Instituto Nacional de Engenharia de Superfícies.
Invited lecture of the Simposium N "Surface Engineering - functional coatings and modified surfaces" at the XIII SBPMat (Brazilian MRS) meeting, in João Pessoa (Brazil). The lecture took place on September 29th, 2014.
The speaker was Tiberiu Minea, Professor at Université Paris-Sud (France), President of the French Federation of Scientific Societies and President of the Scientific and Technical Committee at the French Vacuum Society.
Invited lecture of the Simposium N "Surface Engineering - functional coatings and modified surfaces" at the XIII SBPMat (Brazilian MRS) meeting, in João Pessoa (Brazil). The lecture took place on September 29th, 2014.
The speaker was Prof. Amilton Sinatora (Escola Politécnica da USP, São Paulo state, Brazil).
Invited lecture of the Simposium N "Surface Engineering - functional coatings and modified surfaces" at the XIII SBPMat (Brazilian MRS) meeting, in João Pessoa (Brazil). The lecture took place on September 29th, 2014.
The speaker was Christopher Muratore, "Wright Brothers Institute Endowed Chair Professor" at the Department of Chemical and Materials Engineering from University of Dayton (USA).
Invited lecture of the Simposium N "Surface Engineering - functional coatings and modified surfaces" at the XIII SBPMat (Brazilian MRS) meeting, in João Pessoa (Brazil). The lecture took place on September 30th, 2014.
The speaker was Professor Christoph Genzel, from the Helmholtz-Zentrum Berlin für Materialien und Energie (HZB), in Germany, where he heads the Department of Microstructure and Residual Stress Analysis and he coordinates a group of diffraction and scattering. Genzel is also Associate Professor at the Technische Universität Berlin.
Workshop oferecido no dia 26 de agosto de 2014 na Universidade de Caxias do Sul (UCS) pelo professor Deniol Tanaka, professor titular da Escola Politécnica da USP (EPUSP), doutor em Engenharia Metalúrgica pela EPUSP, mestre em Ciências pelo ITA e engenheiro mecânico pela UNESP. O workshop foi realizado com a participação de cerca de 40 pessoas, entre outras, graduandos de Engenharias e Fotografia, mestrandos e doutorandos de Materiais e profissionais de empresas.
A workshop formou parte da programação do 1º Seminário de Tecnologia, Inovação e Desenvolvimento Social do Centro de Ciências Exatas e da Tecnologia (CCET) da UCS e foi patrocinado pelo Instituto Nacional de Engenharia de Superfícies.
ATENÇÃO: O arquivo original desta apresentação tem várias animações. Faça download do arquivo se deseja apreciar a apresentação com animações.
Palestra proferida pelo professor Deniol Tanaka (Escola Politécnica da USP), estudioso de Leonardo da Vinci desde a década de 1970. A apresentação ocorreu no UCS Teatro (teatro da Universidade de Caxias do Sul, UCS, no Rio Grande do Sul) na noite de 25 de agosto de 2014, com um público de cerca de 800 pessoas. Foi a palestra inaugural do 1º Seminário de Tecnologia, Inovação e Desenvolvimento Social do Centro de Ciências Exatas e da Tecnologia (CCET) da UCS e também a palestra comemorativa dos 10 anos do Programa de Pós-Graduação em Materiais (PGMAT) da UCS. A palestra foi patrocinada pelo Instituto Nacional de Engenharia de Superfícies.
ATENÇÃO: O arquivo original desta apresentação tem várias animações. Faça download do arquivo se deseja apreciar a apresentação com animações.
Seminário proferido por Iñigo Braceras Izagirre, do Centro de P,D e I TECNALIA (San Sebastián, Espanha) na seção UCS do Instituto Nacional de Engenharia de Superfícies, no dia 17 de abril para um público de cerca de 30 estudantes e professores.
Arquivo do seminário proferido no dia 29 de agosto pelo professor Roberto Martins (USP) na seção UCS do Instituto Nacional de Engenharia de Superfícies sobre métodos numéricos na análise de esforços de contato em sistemas com e sem revestimento para um público de cerca de 20 estudantes de graduação e pós e professores.
Arquivo do seminário apresentado pelo professor Fernando Alvarez, pesquisador da seção Unicamp do Instituto Nacional de Engenharia de Superfícies, no dia 20 de agosto de 2013, na seção UCS do Instituto, para um público de 30 estudantes e professores de cursos de graduação e pós-graduação.
Arquivo do seminário apresentado pelo doutor Alexandre Martins Barros, diretor do Instituto SENAI de Inovação em Engenharia de Superfícies, no dia 4 de abril na seção UCS do Instituto Nacional de Engenharia de Superfícies para um público de 30 estudantes e professores.
Palestra apresentada por Carlos A. Figueroa, co-fundador da Plasmar Tecnologia (empresa spinoff da seção UCS do Instituto Nacional de Engenharia de Superfícies), na Câmara de Indústria, Comércio e Serviços de Caxias do Sul em 24 de agosto de 2012 para cerca de 200 pessoas e na Universidade de Caxias do Sul, no dia 1° de novembro, para cerca de 20 professores e estudantes.
Este livro eletrônico reúne 17 artigos de divulgação escritos por pesquisadores do Instituto Nacional de Engenharia de Superfícies sobre processos, materiais, aplicações e métodos da engenharia de superfícies. Faça download aqui ou entre em contato para solicitar o PDF: http://engenhariadesuperficies.com.br/fale-conosco.asp.
Versão do seminário apresentado por Celia Olivero (Horiba) na seção UCS do Instituto Nacional de Engenharia de Superfícies no dia 28 de junho para um público de 18 estudantes, professores e profissionais de empresas.
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5. Ion Scattering - MEIS
Improved
H+ depth and mass
resolution
(amorphous)
Surface
sensitivity
(crystal)
6. MEIS - Advantages
Penetrating (can access buried interfaces!)
Mass specific
Known interaction law (cross sections are
known) – quantitative technique – can
determine absolute number of atoms in the
sample
Excellent depth resolution
Non-destructive
7. MEIS data collection Schulte H. (Private communication)
Energy Spectrum Angular Spectrum
Yield
gl g
An ter i n
e
at
Sc
Energy
d
el
Yi
MC ion scattering simulation of
Deconvolution of ES gives depth
angular yield provides surface
profile (primarily for amorphous
structure.
thin films).
8. MEIS Spectrum
3.0
o
2.5 = 60
Counts (arb. units)
2.0
Energy
1.5
1.0
0.5
0.0
Angle 93.0 93.5 94.0 94.5 95.0
proton energy
Summed over 2 degrees around = 60o
9. MEIS user Community
• Depth profiling (amourphous)
•High-k materials
•Thin films
…
• Structural determination
•Heterogeneous catalysis
•Surface reconstruction
…
10. Recent Developments (MEIS)
New detectors (MEIS 3D, TOF-MEIS)
Strain measurements
Organic and biological materials analysis
Better understanding of the energy-loss processes
(ab-inito, simple-models)
Nanoparticle/Nanoislands/Quantum dots analysis
Full description of the 2D MEIS spectrum for crystals
18. Nanoparticles
Full Monte-Carlo Simulation
• any geometrical shape (sphere, cylinder,..)
• density distribution
• size distribution
• asymmetrical lineshape
19. Full 3D Monte-Carlo Integration
Monte-
(PowerMeis program)
E0 Eout
E1 E0 E in
E out K i ( ) E1 E out
E1
27. Polyelectrolyte (PE)
charged polymers
films can be tuned with
desired composition and
thickness
can be deposited onto
different substrates
can be easily removed
after nanomaterials
synthesis
34. Nanoparticle analysis – applications
II – Core-shell characterization of
CdSe/ZnS quantum dots
35. Quantum dots CdSe/ZnS
CdSe/
Nanocrystals
Absorption and emission depends on
composition and size
Higher efficiency in fluorescence process
Thin band gap
36. Core-
Core-shell analysis of CdSe/ZnS
CdSe/
quantum dots
Liquid sample – EviDots
(maple red-orange) in
toluene solution – 2.2
mg/L
Dilutedin toluene at 3.82 g/L
Deposited on SiO2/Si(100) substrate
44. Pb nanoislands at SiO2 / Si
2 D array
SiO2 Si
• Produced by ion implantation (300 keV Pb)
• Thermal annealing : 200oC (100 hours) + 1100oC (1 hour)
• Two SiO2 thicknesses (different etching times)
45 and 65 nm
45. Pb nanoislands : TEM images
Cross-section Plan view
3.7x1011 NPs/cm2
51. TEM plan view
3.7 x 1011 NPs/cm2
MEIS (best fit) (4.5 ± 1.5) x1011 NPs/cm2
52. Where do they deviations come from ?
Multiple Scattering Effects ?
some NPs in Si (bulk)
atomic Pb ?
NP Size Distribution ?
Experimental
1000 Simulation
some NPs in SiO2
Counts (a.u.)
500
0
66 68 70 72 74 76 78 80
Energy (keV)
54. Shape Sensitivity
11 2
2x10 NPs/cm
Experimental
Film
TEM
Sphere
11 2
3.5x10 NPs/cm
Experimental
Film
Counts (a. u.)
TEM
Sphere
11 2
6 x10 NPs/cm
Experimental
Film
TEM
Sphere
68 70 72 74 76 78 80
Counts (a. u.)
D.F. Sanchez et al. Surface Science 605 (2011) 654
55. Nanoparticle analysis – applications
Au (sputtering)
IV – Burried Au NPs
SiO2
sputtering
Si (bulk)
56. Porto Alegre,
Brazil
~40 nm
SiO2 (sputtering)
Au (sputtering)
7.4 × 1015 Au atoms/cm2
SiO2
3.1 × 1015 Au atoms/cm2
Si (bulk)
1.8 × 1015 Au atoms/cm2
56
60. As implanted 1 minute
MEIS → 109º 109º
H+ 150 keV
Scattered Intensity (a. u.)
120º 120º
Lower Hutt, New Zealand
131º
Si 131º
Si Fe
Fe Fe surface
1.0 x 1016 atoms/cm2
132 136 140 144 132 136 140 144
Energy (keV)
Fe
surface
J. Kennedy et. al., Nanotechnology, 22, 115602 (2011) 60
61. Statistics and shape from
TEM as input to obtain
shell stoichiometry from
MEIS analysis
2 Rshell
2 Rcore
61
62. XPS + MEIS/TEM
Fe@FexSi33-xO67
33-
SiO2 density (atoms/cm3)
Fe@Fe14Si19O67
Fe Fe
Si Si
62
63. Simple approach for the
full description of the 2D –MEIS
spectrum-
spectrum- Crystals
66. VEGAS Monte Carlo Simulation
well established in MEIS
just the area of the surface peak
Phit and Pdet
(only the blocking curves !)
66
67. Extending the VEGAS code
to include ion scattered energies
Improve surface determination
•Bimetallic surfaces
•Thermal vibration correlations
•Dechanneling background
68. Energy Loss
single collision
0.020
0.018
0.016
0.014
dP/d E(eV )
0.012
-1
0.010
0.008
0.006
0.004
0.002
0.000
0 50 100 150 200 250 300 350 400 450 500 550 600 68
Energy Transfer ( E) (eV)
69. Cu (111) single crystal
•single atomic type
•very small relaxation
•previously analyzed by MEIS
A,.Hentz et al. PRL 102, 096103 (2009)
77. Summary
MEIS for NP characterization
1) On the surface : Excellent (using asymmetrical lineshape)
2) Buried NPs : sensitivity for the areal density
no sensitivity for the geometrical shape
MS effects are important
78. Summary II
This opens new perspectives for nanostructure analysis in situ that
can of great interest.
Pitfall : Dissolved atomic species affect MEIS analysis
79. Summary III
Simple approach for the full 2D MEIS spectrum (Crystal)
(VEGAS extended)
• Visibility of each layer
• Electronic energy-loss at hard-collision (asymmetric)
• Impact parameter dependent energy-loss
Input parameters : , dE/dx, dW2/dx
Useful to improve surface determination
80. Gregor Schiwietz
Helmholtz-
Helmholtz-Zentrum Berlin
Phil Woodruff Daewon Moon
Warwick KRISS
Mauricio, Dario,Agenor, Paulo, Adriano
Giovanna, Claudio
UFRGS – Porto Alegre
Jêróme Leveneur, John Kennedy,
National Isotope Centre, GNS Science
New Zealand
80