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Title:

2008 Westermann et Volume al. 9, Issue 10, Article R150 Open Access

Author:

Frank Westermann ; Daniel Muth ; Axel Benner ; Tobias Bauer ; Oliver Henrich ; André Oberthuer ; Benedikt Brors ; Tim Beissbarth ; Jo V ; Filip Pattyn ; ...

Description:

Distinct transcriptional MYCN/c-MYC activities are associated with spontaneous regression or malignant progression in neuroblastomas

Distinct transcriptional MYCN/c-MYC activities are associated with spontaneous regression or malignant progression in neuroblastomas Minimize

Contributors:

The Pennsylvania State University CiteSeerX Archives

Year of Publication:

2013-08-16

Source:

http://www.biomedcentral.com/content/pdf/gb-2008-9-10-r150.pdf

http://www.biomedcentral.com/content/pdf/gb-2008-9-10-r150.pdf Minimize

Document Type:

text

Language:

en

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Metadata may be used without restrictions as long as the oai identifier remains attached to it.

Metadata may be used without restrictions as long as the oai identifier remains attached to it. Minimize

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Title:

Nonlinear Rheology of Colloidal Suspensions ; Nichtlineare Rheologie kolloidaler Suspensionen

Description:

The extension of mode-coupling theory (MCT) to sheared systems is one of the major extensions of the theoretical framework during recent years. Previous results of this novel approach were restricted to analyses with schematic mode-coupling models or were performed within a simplified isotropic microscopic model, which distributed the advection ...

The extension of mode-coupling theory (MCT) to sheared systems is one of the major extensions of the theoretical framework during recent years. Previous results of this novel approach were restricted to analyses with schematic mode-coupling models or were performed within a simplified isotropic microscopic model, which distributed the advection of the wavevectors equally over their Cartesian coordinates. It is the aim of this work to consider the situation more rigorously, though only in two dimensions, and to account explicitly for the anisotropy of the mode-coupling equations. ; Die Erweiterung der Modenkopplungstheorie (MCT) auf gescherte Systeme ist eine der wichtigsten Weiterentwicklungen des theoretischen Überbaus der letzen Jahre. Vorherige Ergebnisse dieses neuen Zugangs waren stets auf Analysen mit schematischen Modenkopplungsmodellen beschränkt, oder erfolgten innerhalb eines vereinfachten isotropen, mikroskopischen Modells, das die Advektion der Wellenvektoren gleichmäßig über deren kartesische Koordinaten verteilte. Ziel dieser Arbeit ist es, die Zusammenhänge in einem strengeren Sinne zu beleuchten, allerdings nur auf zwei Dimensionen beschränkt, und der Anisotropie der Modenkopplungsgleichungen explizit Rechnung zu tragen. Minimize

Year of Publication:

2007

Document Type:

doc-type:doctoralThesis ; doc-type:Text

Language:

eng

Subjects:

Glasübergang ; Kolloidale Suspensionen ; Modenkopplungstheorie ; einfacher Scherfluss ; glass transition ; Mode Coupling Theory ; rheology ; colloidal suspensions ; simple shear flow ; ddc:530 ; Theoretische Physik ; Statistische Physik ; Glas ; Rheologie

Glasübergang ; Kolloidale Suspensionen ; Modenkopplungstheorie ; einfacher Scherfluss ; glass transition ; Mode Coupling Theory ; rheology ; colloidal suspensions ; simple shear flow ; ddc:530 ; Theoretische Physik ; Statistische Physik ; Glas ; Rheologie Minimize

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Title:

Auswirkungen der DRG-Gesetzgebung auf die Schulterchirurgie an einer Universitätsklinik

Publisher:

Ludwig-Maximilians-Universität München

Year of Publication:

2005-12-15

Document Type:

Dissertation ; NonPeerReviewed

Subjects:

Medizinische Fakultät

Medizinische Fakultät Minimize

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http://edoc.ub.uni-muenchen.de/5206/

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Title:

Yield stress discontinuity in a simple glass

Description:

Large-scale molecular-dynamics simulations are performed to study the steady-state yielding dynamics of a well-established simple glass. In contrast to the supercooled state, where the shear stress, tends to zero at vanishing shear rate, a stress plateau forms in the glass which extends over about two decades in shear rate. This strongly suggest...

Large-scale molecular-dynamics simulations are performed to study the steady-state yielding dynamics of a well-established simple glass. In contrast to the supercooled state, where the shear stress, tends to zero at vanishing shear rate, a stress plateau forms in the glass which extends over about two decades in shear rate. This strongly suggests the existence of a finite dynamic yield stress in the glass. Furthermore, the temperature dependence of suggests a yield stress discontinuity at a critical temperature of Tc=0.4 in agreement with recent mode coupling theory predictions. The corresponding qualitative change of the flow curves enables us to bracket the critical temperature Tc of the theory from above and from below. We scrutinize and support this observation by testing explicitly for the assumptions (affine flow, absence of flow-induced ordering) inherent in the theory. Furthermore, while qualitative similarity is found between the viscosity and the final relaxation time of stress fluctuations, significant quantitative differences are observed in the nonlinear regime. Minimize

Year of Publication:

2006

Source:

First publ. in: Physical Review B 73 (2006), Article 174209

First publ. in: Physical Review B 73 (2006), Article 174209 Minimize

Document Type:

doc-type:article ; doc-type:Text

Language:

eng

Subjects:

ddc:530 ; 64.70.Pf ; 05.70.Ln ; 83.60.Df ; 83.60.Fg

ddc:530 ; 64.70.Pf ; 05.70.Ln ; 83.60.Df ; 83.60.Fg Minimize

DDC:

541 Physical chemistry *(computed)*

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Title:

Yield Stress Discontinuity in a Simple Glass

Description:

Large scale molecular dynamics simulations are performed to study the steady state yielding dynamics of a well established simple glass. In contrast to the supercooled state, where the shear stress, $\sigma$, tends to zero at vanishing shear rate, $\gammadot$, a stress plateau forms in the glass which extends over about two decades in shear rate...

Large scale molecular dynamics simulations are performed to study the steady state yielding dynamics of a well established simple glass. In contrast to the supercooled state, where the shear stress, $\sigma$, tends to zero at vanishing shear rate, $\gammadot$, a stress plateau forms in the glass which extends over about two decades in shear rate. This strongly suggests the existence of a finite dynamic yield stress in the glass, $\sigma^+ (T) \equiv \sigma(T; \gammadot \to 0) >0$. Furthermore, the temperature dependence of $\sigma^+$ suggests a yield stress discontinuity at the glass transition in agreement with recent theoretical predictions. We scrutinize and support this observation by testing explicitly for the assumptions (affine flow, absence of flow induced ordering) inherent in the theory. Also, a qualitative change of the flow curves enables us to bracket the glass transition temperature $T_c$ of the theory from above and (for the first time in simulations) {\it from below}. Furthermore, the structural relaxation time in the steady state behaves quite similar to the system viscosity at all studied shear rates and temperatures. ; Comment: 4 pages, 5 figures Minimize

Year of Publication:

2005-11-29

Document Type:

text

Subjects:

Condensed Matter - Soft Condensed Matter ; Condensed Matter - Statistical Mechanics

Condensed Matter - Soft Condensed Matter ; Condensed Matter - Statistical Mechanics Minimize

DDC:

541 Physical chemistry *(computed)*

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Title:

Dynamic yield stresses of glasses : asymptotic formulae

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Description:

The stationary, shear rate dependent flow curves of yielding glasses are discussed within a mode coupling theory approach. Asymptotic formulae for the shear stress at the transition point are obtained that take the form of generalized Hershel Bulkeley constitutive equations, and enable one to find dynamical yield stresses by extrapolation.

The stationary, shear rate dependent flow curves of yielding glasses are discussed within a mode coupling theory approach. Asymptotic formulae for the shear stress at the transition point are obtained that take the form of generalized Hershel Bulkeley constitutive equations, and enable one to find dynamical yield stresses by extrapolation. Minimize

Year of Publication:

2005

Source:

First publ. in: Journal of Physics / Condensed Matter, 17 (2005), 45, pp. S3625-S3630

First publ. in: Journal of Physics / Condensed Matter, 17 (2005), 45, pp. S3625-S3630 Minimize

Document Type:

doc-type:article ; doc-type:Text

Language:

eng

Subjects:

ddc:530

ddc:530 Minimize

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Title:

Nonequilibrium structure of concentrated colloidal fluids under steady shear : leading-order response

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Description:

The flow-induced microstructural distortions of dense colloidal dispersions under steady shearing are derived within a recent first-principles approach to the nonlinear rheology of colloidal fluids and glasses. The stationary structure factor is discussed to leading orders in shear rate dot {gamma } . We find that shear affects the stationary st...

The flow-induced microstructural distortions of dense colloidal dispersions under steady shearing are derived within a recent first-principles approach to the nonlinear rheology of colloidal fluids and glasses. The stationary structure factor is discussed to leading orders in shear rate dot {gamma } . We find that shear affects the stationary structure whenever the dressed Peclet/Weissenberg number mathit {Pe}=dot {gamma }tau becomes appreciable; here τ is the structural or α-relaxation time. Close to vitrification, this predicts significantly larger shear distortions than expected from considering the bare Peclet number Pe0; it compares dot {gamma } with the diffusion time of a colloid at infinite dilution. Minimize

Year of Publication:

2007

Source:

First publ. in: Jornal of Physics: Condensed Matter 19 (2007), 205132

First publ. in: Jornal of Physics: Condensed Matter 19 (2007), 205132 Minimize

Document Type:

doc-type:article ; doc-type:Text

Language:

eng

Subjects:

ddc:530

ddc:530 Minimize

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Title:

Schematic Mode Coupling Theories for Shear Thinning, Shear Thickening, and Jamming

Author:

Description:

Mode coupling theory (MCT) appears to explain several, though not all, aspects of the glass transition in colloids (particularly when short-range attractions are present). Developments of MCT, from rational foundations in statistical mechanics, account qualitatively for nonlinear flow behaviour such as the yield stress of a hard-sphere colloidal...

Mode coupling theory (MCT) appears to explain several, though not all, aspects of the glass transition in colloids (particularly when short-range attractions are present). Developments of MCT, from rational foundations in statistical mechanics, account qualitatively for nonlinear flow behaviour such as the yield stress of a hard-sphere colloidal glass. Such theories so far only predict shear thinning behaviour, whereas in real colloids both shear thinning and shear thickening can be found. The latter observation can, however, be rationalised by postulating an MCT vertex that is not only a decreasing function of strain rate (as found from first principles) but also an increasing function of stress. Within a highly simplified, schematic MCT model this can lead not only to discontinuous shear thickening but also to complete arrest of a fluid phase under the influence of an external stress ("full jamming"). Minimize

Year of Publication:

2003

Source:

First publ. in: http://de.arxiv.org/pdf/cond-mat/0310579

First publ. in: http://de.arxiv.org/pdf/cond-mat/0310579 Minimize

Document Type:

doc-type:article ; doc-type:Text

Language:

eng

Subjects:

ddc:530

ddc:530 Minimize

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Title:

Hard discs under steady shear: comparison of Brownian dynamics simulations and mode coupling theory

Author:

Description:

Brownian dynamics simulations of bidisperse hard discs moving in two dimensions in a given steady and homogeneous shear flow are presented close to and above the glass transition density. The stationary structure functions and stresses of shear-melted glass are compared quantitatively to parameter-free numerical calculations of monodisperse hard...

Brownian dynamics simulations of bidisperse hard discs moving in two dimensions in a given steady and homogeneous shear flow are presented close to and above the glass transition density. The stationary structure functions and stresses of shear-melted glass are compared quantitatively to parameter-free numerical calculations of monodisperse hard discs using mode coupling theory within the integration through transients framework. Theory qualitatively explains the properties of the yielding glass but quantitatively overestimates the shear-driven stresses and structural anisotropies. Minimize

Year of Publication:

2009

Source:

First publ. in: Philosophical Transactions of the Royal Society of London / A, 367 (2009), pp. 5033-5050

First publ. in: Philosophical Transactions of the Royal Society of London / A, 367 (2009), pp. 5033-5050 Minimize

Document Type:

doc-type:conferenceObject ; doc-type:Text

Language:

eng

Subjects:

rheology ; colloids ; glasses ; ddc:530

rheology ; colloids ; glasses ; ddc:530 Minimize

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Title:

Ordering dynamics of blue phases entails kinetic stabilization of amorphous networks

Author:

Description:

The cubic blue phases of liquid crystals are fascinating and technologically promising examples of hierarchically structured soft materials, comprising ordered networks of defect lines (disclinations) within a liquid crystalline matrix. We present large-scale simulations of their domain growth, starting from a blue phase nucleus within a superco...

The cubic blue phases of liquid crystals are fascinating and technologically promising examples of hierarchically structured soft materials, comprising ordered networks of defect lines (disclinations) within a liquid crystalline matrix. We present large-scale simulations of their domain growth, starting from a blue phase nucleus within a supercooled isotropic or cholesteric background. The nucleated phase is thermodynamically stable; one expects its slow orderly growth, creating a bulk cubic phase. Instead, we find that the strong propensity to form disclinations drives the rapid disorderly growth of a metastable amorphous defect network. During this process, the original nucleus is destroyed; reemergence of the stable phase may therefore require a second nucleation step. Our findings suggest that blue phases exhibit hierarchical behavior in their ordering dynamics, to match the hierarchy in their structure. Minimize

Publisher:

National Academy of Sciences

Year of Publication:

2010-07-27

Document Type:

Text

Language:

en

Subjects:

Physical Sciences

Physical Sciences Minimize

DDC:

612 Human physiology *(computed)*

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