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Browsing by Subject "Phase transitions"

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A Bayesian estimation method for variational phase-field fracture problems

Khodadadian, Amirreza; Noii, Nima; Parvizi, Maryam; Abbaszadeh, Mostafa; Wick, Thomas; Heitzinger, Clemens (Berlin : Springer, 2020)

In this work, we propose a parameter estimation framework for fracture propagation problems. The fracture problem is described by a phase-field method. Parameter estimation is realized with a Bayesian approach. Here, the ...
Crossover between monopole and multipole plasmon of Cs monolayers on Si(111) individually resolved in energy and momentum

Zielasek, V.; Rönitz, N.; Henzler, M.; Pfnür, Herbert (College Park, MD : American Physical Society, 2006)

The evolution of the plasmon spectrum of the Si(111) (7×7)-Cs surface has been studied by energy loss spectroscopy individually resolved in energy and momentum during the transition from substrate to Cs overlayer metallization. ...
Development of a numerical workflow based on μ-CT imaging for the determination of capillary pressure-saturation-specific interfacial area relationship in 2-phase flow pore-scale porous-media systems: A case study on Heletz sandstone

Peche, Aaron; Halisch, Matthias; Bogdan Tatomir, Alexandru; Sauter, Martin (Göttingen : Copernicus GmbH, 2016)

In this case study, we present the implementation of a finite element method (FEM)-based numerical pore-scale model that is able to track and quantify the propagating fluid–fluid interfacial area on highly complex ...
Digital image correlation at high temperatures for fatigue and phase transformation studies

Holzweissig, Martin J.; Kanagarajah, Pirabagini; Maier, Hans Jürgen (London : SAGE Publications Ltd., 2014)

In this study, digital image correlation was used for two widely different cases to assess the potential and the limitations of the technique for applications at high temperatures. Specifically, digital image correlation ...
Dynamical scaling of the quantum Hall plateau transition

Hohls, Frank; Zeitler, U.; Haug, Rolf J.; Meisels, R.; Dybko, K.; Kuchar, F. (College Park, MD : American Physical Society, 2002)

The dynamical scaling of the quantum Hall plateau phase transition in the frequency range 0.1-55 GHz was examined. A universal scaling function was observed, yielding a dynamical exponent 0.9 ± 0.2. The universal behavior ...
Dynamics of ion Coulomb crystals

Timm, Lars (Hannover : Institutionelles Repositorium der Leibniz Universität Hannover, 2023)

The field of quantum simulations has achieved a remarkable success through the development of highly controllable and accessible quantum platforms, which pro- vide insights into the microscopic properties of complex ...
Experimental-numerical approach to efficient TTT-generation for simulation of phase transformations in thermomechanical forming processes

Behrens, Bernd-Arno; Chugreev, Alexander; Kock, C. (Bristol : Institute of Physics Publishing, 2018)

Residual stresses in components are an important issue in most manufacturing processes, as they influence the performance of the final part. Regarding hot forming processes there is a great potential of defining a targeted ...
Formation of locally aluminum-doped p-type silicon regions by in-line high-rate evaporation

Mader, Christoph; Bock, Robert; Müller, Jens; Schmidt, Jan; Brendel, Rolf (Amsterdam : Elsevier BV, 2011)

Locally aluminum-doped p-type silicon regions are formed by in-line high-rate evaporation of aluminum. We deposit aluminum layers of 28 μm thickness at dynamic deposition rates of 20 μm×m/min on locally laser-ablated Al2O3 ...
Grain Boundary Wetting by a Second Solid Phase in the High Entropy Alloys: A Review

Straumal, Boris B.; Korneva, Anna; Lopez, Gabriel A.; Kuzmin, Alexei; Rabkin, Eugen; Gerstein, Gregory; Straumal, Alexander B.; Gornakova, Alena S. (Basel : MDPI, 2021)

In this review, the phenomenon of grain boundary (GB) wetting by the second solid phase is analyzed for the high entropy alloys (HEAs). Similar to the GB wetting by the liquid phase, the GB wetting by the second solid phase ...
The Grain Boundary Wetting Phenomena in the Ti-Containing High-Entropy Alloys: A Review

Straumal, Boris B.; Korneva, Anna; Kuzmin, Alexei; Lopez, Gabriel A.; Rabkin, Eugen; Straumal, Alexander B.; Gerstein, Gregory; Gornakova, Alena S. (Basel : MDPI, 2021)

In this review, the phenomenon of grain boundary (GB) wetting by melt is analyzed for multicomponent alloys without principal components (also called high‐entropy alloys or HEAs) containing titanium. GB wetting can be ...
High frequency conductivity in the quantum Hall regime

Hohls, Frank; Zeitler, U.; Haug, Rolf J. (College Park, MD : American Physical Society, 2001)

The frequency dependence of the longitudinal conductivity σxx for frequencies up to 6 GHz was measured. It was possible to access both the real part and the imaginary part of σxx which allowed to perform a new test of ...
Hopping conductivity in the quantum Hall effect: Revival of universal scaling

Hohls, Frank; Zeitler, U.; Haug, Rolf J. (College Park, MD : American Physical Society, 2002)

The temperature and electric field dependence of the conductivity in the quantum Hall effect (QHE) plateau transition for samples where no universal behavior is found in the conventional temperature dependent peak-width ...
Microstructural evolution and functional fatigue of a Ti–25Ta high-temperature shape memory alloy

Maier, Hans Jürgen; Karsten, Elvira; Paulsen, Alexander; Langenkämper, Dennis; Decker, Peer; Frenzel, Jan; Somsen, Christoph; Ludwig, Alfred; Eggeler, Gunther; Niendorf, Thomas (Cambridge : Cambridge University Press, 2017)

Titanium–tantalum based alloys can demonstrate a martensitic transformation well above 100 °C, which makes them attractive for shape memory applications at elevated temperatures. In addition, they provide for good workability ...
Optical Trapping of Ion Coulomb Crystals

Schmidt, Julian; Lambrecht, Alexander; Weckesser, Pascal; Debatin, Markus; Karpa, Leon; Schaetz, Tobias (College Park, Md. : APS, 2018)

The electronic and motional degrees of freedom of trapped ions can be controlled and coherently coupled on the level of individual quanta. Assembling complex quantum systems ion by ion while keeping this unique level of ...
Role of the metal cation in the dehydration of the microporous metal–organic frameworks CPO-27-M

Rosnes, Mali H.; Pato-Doldán, Breogán; Johnsen, Rune E.; Mundstock, Alexander; Caro, Jürgen; Dietzel, Pascal D.C. (Amsterdam [u.a.] : Elsevier, 2020)

The dehydration of the CPO-27-M (M-MOF-74, M = Zn, Co, Ni, Mg, Mn, Cu) metal-organic framework series has been investigated comprehensively using in situ variable temperature powder X-ray diffraction (VT-PXRD) and thermal ...
A simple micromechanical model for pseudoelastic behavior of CuZnAl alloy

Levitas, V.I.; Idesman, A.V.; Stein, E.; Spielfeld, J.; Hornbogen, E. (London : SAGE Publications Ltd., 1998)

A simple micromechanical model for thermoelastic martensitic phase transitions (PT) is developed. It is deduced from the local description of PT in transforming particles with subsequent usage of average procedure, based ...
Switching between one and two dimensions: Conductivity of Pb-induced chain structures on Si(557)

Tegenkamp, Christoph; Kallassy, Z.; Pfnür, Herbert; Günter, H.-L.; Zielasek, V.; Henzler, M. (College Park, MD : American Physical Society, 2005)

We show in a combined study of four-point conductance measurement and tunneling microscopy that surface state conductance induced by one monolayer of Pb on Si(557) can be quasi one dimensional with conductivity values close ...

Now showing items 1-17 of 17

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