Search results for: Michael Gross

Items from 1 to 20 out of 553 results

article

Percutaneous repair of moderate‐to‐severe or severe functional mitral regurgitation in patients with symptomatic heart failure: Baseline characteristics of patients in the RESHAPE‐HF2 trial and comparison to COAPT and MITRA‐FR trials

Stefan D. Anker, Tim Friede, Ralph Stephan Bardeleben, Javed Butler, more

European Journal of Heart Failure > 26 > 7 > 1608 - 1615

Aim The RESHAPE‐HF2 trial is designed to assess the efficacy and safety of the MitraClip device system for the treatment of clinically important functional mitral regurgitation (FMR) in patients with heart failure (HF). This report describes the baseline characteristics of patients enrolled in the RESHAPE‐HF2 trial compared to those enrolled in the COAPT and MITRA‐FR trials. Methods and results...

article

Neue Kohlenstoff‐Moleküle

Michael Groß

Chemie in unserer Zeit > 58 > 3 > 142 - 143

Durch Manipulation von Einzelmolekülen im Rastermikroskop gelang die Synthese von neuartigen Allotropen des Kohlenstoffs, die sich als ringförmig geschlossene Polyine beschreiben lassen. Sowohl aromatische als auch anti‐aromatische Ringe sind inzwischen charakterisiert.

article

Incorporation of thermal effects into the energy‐momentum consistent elastic model for fiber‐bending stiffness in composites

Julian Dietzsch, Iniyan Kalaimani, Michael Gross

PAMM > 22 > 1 > n/a - n/a

Owing to the wide acceptance of fiber reinforced composites in the lightweight structure industry, the need to study its thermo‐elastic behavior in dynamical multi‐body systems still remains an open question. Standard continuum models, by virtue of first‐order gradient of deformation, cannot capture curvature effects and hence appropriate extensions of the standard modeling techniques are indispensable...

article

Moleküle aus dem Weltraum

Michael Groß

Chemie in unserer Zeit > 56 > 3 > 153 - 153

Im Weltall finden sich überwiegend Wasserstoff‐ und Heliumatome, mit denen man nicht viel Chemie betreiben kann. Wo andere Elemente wie Kohlenstoff und Stickstoff auftreten, können aber auch unter Weltraumbedingungen interessante Moleküle entstehen. Diese lassen sich im Labor herstellen und in Proben von Meteoriten nachweisen.

article

Tanz der Elektronen

Michael Groß

Chemie in unserer Zeit > 56 > 2 > 85 - 85

Um die einfachste Ringschluss‐Reaktion der organischen Chemie auf einer Oberfläche beobachten zu können, mussten Forscher sie erst einmal ziemlich kompliziert machen.

article

A mixed finite element formulation for energy‐momentum time integrations of composites with fiber bending stiffness

Julian Dietzsch, Michael Gross, Iniyan Kalaimani

PAMM > 21 > 1 > n/a - n/a

We aim at dynamic simulations of 3D‐fiber‐reinforced materials in light‐weight structures, which are reinforced by fiber rovings comprised of thousands of filaments. Each roving possesses a separate bending stiffness, which has a large influence on the material behaviour on the macro scale. For the description of this material behavior, we extend a hyperelastic anisotropic Cauchy continuum formulation,...

article

An energy‐momentum scheme for extended continuum models with rotational degrees of freedom

Michael Groß, Julian Dietzsch, Iniyan Kalaimani

PAMM > 21 > 1 > n/a - n/a

In mechanical engineering, the finite element method is well‐known in the simulation of homogeneous materials without microstructures. But, in particular, microstructures can improve materials with respect to their applicability in engineering. Examples are 2D‐ and 3D‐fiber‐reinforced materials, which are manufactured in the microscale or mesoscale, respectively. An efficient finite element simulation...

article

Modeling of fiber‐bending stiffness in fiber‐reinforced composites with a dynamic mixed finite element method based on the principle of virtual power

Iniyan Kalaimani, Julian Dietzsch, Michael Groß

PAMM > 21 > 1 > n/a - n/a

Investigating the bending stiffness of fibers in fiber‐reinforced composites for rotor‐dynamical systems which are subjected to dynamical loads are essential in the development of system design. The proposed numerical modeling approach of fiber‐reinforced composites uses a multi‐field mixed finite element formulation based on a dynamic variational approach to perform long‐term dynamic simulations...

article

80 Millionen Jahre Überleben in der Wüste

Michael Groß

Chemie in unserer Zeit > 55 > 5 > 294 - 295

In der Namibwüste im Südwesten Afrikas gedeiht eine extrem ungewöhnliche und widerstandsfähige Pflanzenart, Welwitschia mirabilis (Abbildung 1). Eine Genomstudie hat nun einige der molekularen Grundlagen ihrer außerordentlichen Resistenz aufgeklärt.

article

Neue Kohlenstoff‐Muster

Michael Groß

Chemie in unserer Zeit > 55 > 4 > 224 - 225

Die Zahl der Kohlenstoff‐Allotrope nimmt unaufhaltsam zu. Zu den neuesten Verwandlungsformen des vielseitigen Elements zählen ein zum Ring geschlossenes Polyin sowie ein regelmäßiges Kachelmuster, dessen Einheiten nicht alle sechseckig sind.

article

Wie aus Chemie Biologie entsteht

Michael Groß

Chemie in unserer Zeit > 55 > 3 > 153 - 153

Die Frage nach dem Ursprung des Lebens hat schon viel Spekulation ausgelöst. Jetzt allerdings steht die Wissenschaft kurz davor, den entscheidenden Schritt von lebloser Materie zu evolvierenden Molekülen im Labor nachvollziehen zu können.

article

Im Innern der Glasnadeln

Michael Groß

Chemie in unserer Zeit > 55 > 1 > 12 - 12

Silicateine sind seit über 20 Jahren als Enzyme der Biomineralisation von Siliciumdioxid bekannt, haben sich aber der Kristallisation im Labor und damit der Strukturanalyse widersetzt. Jetzt konnten Forscher die Struktur anhand von natürlichen Kristallen im Innern der Glasnadeln von Schwämmen ermitteln.

article

Mixed finite element formulations and energy‐momentum time integrators for thermo‐viscoelastic fiber‐reinforced continua

Julian Dietzsch, Michael Groß, Richard Friedrich Schuffenhauer

PAMM > 20 > 1 > n/a - n/a

Today, fiber‐reinforced materials and their exact dynamic simulation play a significant role in the construction of lightweight structures. These materials are used in aircraft, automobiles and wind turbines, for instance. The low density and the high modulus of elasticity play a major role, but also the thermal properties should not be neglected. First of all, the thermal expansion of the matrix...

article

Dynamic Stability of Viscoelastic Bars under Pulsating Axial Loads

Dominik Kern, Richard Gypstuhl, Michael Groß

PAMM > 20 > 1 > n/a - n/a

Recent applications require the extension of stability theory to axially loaded viscoelastic bars. For elastic bars it is known that a pulsating load leads to a Mathieu equation. Meaning, there are some instable regions before the static buckling load and some stable regions beyond, depending on the excitation (amplitude, frequency, offset). To fill this gap we follow along the lines of Weidenhammer...

article

An energy‐momentum space‐time discretization of a constrained micropolar continuum for 3D fiber‐reinforced composites

Michael Groß, Julian Dietzsch, Chris Röbiger

PAMM > 20 > 1 > n/a - n/a

In 2D fiber‐reinforced composites, single fibers with a diameter in the range of micrometers are embedded in a matrix material. 3D fiber‐reinforced composites consist of fiber bundles (rovings) with diameters of millimeters. Therefore, 3D fiber‐reinforced composites require an extended material modelling, because a fiber bundle has to be considered as a beam‐like structure with curvature‐twist (twisting...

article

Scheidung auf chemisch

Michael Groß

Chemie in unserer Zeit > 54 > 4 > 215 - 215

Wenn die Chemie nicht mehr stimmt, dann paaren sich Insekten getrennter Populationen nicht mehr miteinander und evolvieren zu verschiedenen Arten. Chemische Verständigungsprobleme werden für die Trennung der Abstammungslinien von Tabakschwärmer und Seidenspinner vor 12 Millionen Jahren verantwortlich gemacht. Eine neue Arbeit beschreibt jetzt den Vorgang in statu nascendi bei vier Unterarten der Taufliege...

article

Den Urmenschen auf den Zahn gefühlt

Michael Groß

Chemie in unserer Zeit > 54 > 3 > 147 - 147

Vor zehn Jahren wurde das Genom des Neandertalers in einer ersten Version publiziert. Seitdem haben wir aus DNA‐Studien viel über diese Steinzeitmenschen und die gleichzeitig lebenden Denisovaner gelernt. Um tiefer in die Vergangenheit vorzudringen, müssen Forscher nun auf Proteine zurückgreifen, die sich länger halten als DNA.

article

Ein Hückelsches Riesenrad

Michael Groß

Chemie in unserer Zeit > 54 > 2 > 76 - 77

Die Hückel‐Regel, welche die aromatischen Eigenschaften der sechs delokalisierten π‐Elektronen des Benzols erklärt, wurde jetzt auch für riesige Ringsysteme mit bis zu 162 π‐Elektronen bestätigt. Die typischen Ringströme von aromatischen und anti‐aromatischen Molekülen lassen sich durch Redoxreaktionen oder durch geometrische Manipulationen an‐ und ausschalten.

article

A mixed variational‐based dynamic simulation method for fiber‐reinforced continua in non‐isothermal rotordynamical systems

Michael Groß, Julian Dietzsch, Chris Röbiger

PAMM > 19 > 1 > n/a - n/a

Three‐dimensional woven carbon‐fiber reinforced polymers (3D‐CFRP) are being increasingly used for blades in rotordynamical systems as turbine fans, shafts as well as disc brake rotors. By using dynamic mixed finite‐element methods, these materials can be simulated as anisotropic continua with non‐isothermal behaviour in the matrix as well as the fiber material. Therefore, we present a novel dynamic...

article

Variational Integrators and Fluid‐Structure‐Interaction at Low Reynolds‐Number

Dominik Kern, Michael Groß

PAMM > 19 > 1 > n/a - n/a

For the special case of incompressible and highly viscous fluids, the interaction with a rigid body can be collected in a damping matrix, relating the velocities and angular velocities of the body with the fluid force and torque. This damping matrix (a.k.a. viscous resistance matrix) depends exclusively on the geometry and needs to be computed only once. We consider a rigid body moving in an unbound...

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INFONA - science communication portal

Search results for: Michael Gross

Percutaneous repair of moderate‐to‐severe or severe functional mitral regurgitation in patients with symptomatic heart failure: Baseline characteristics of patients in the RESHAPE‐HF2 trial and comparison to COAPT and MITRA‐FR trials

Neue Kohlenstoff‐Moleküle

Incorporation of thermal effects into the energy‐momentum consistent elastic model for fiber‐bending stiffness in composites

Moleküle aus dem Weltraum

Tanz der Elektronen

A mixed finite element formulation for energy‐momentum time integrations of composites with fiber bending stiffness

An energy‐momentum scheme for extended continuum models with rotational degrees of freedom

Modeling of fiber‐bending stiffness in fiber‐reinforced composites with a dynamic mixed finite element method based on the principle of virtual power

80 Millionen Jahre Überleben in der Wüste

Neue Kohlenstoff‐Muster

Wie aus Chemie Biologie entsteht

Im Innern der Glasnadeln

Mixed finite element formulations and energy‐momentum time integrators for thermo‐viscoelastic fiber‐reinforced continua

Dynamic Stability of Viscoelastic Bars under Pulsating Axial Loads

An energy‐momentum space‐time discretization of a constrained micropolar continuum for 3D fiber‐reinforced composites

Scheidung auf chemisch

Den Urmenschen auf den Zahn gefühlt

Ein Hückelsches Riesenrad

A mixed variational‐based dynamic simulation method for fiber‐reinforced continua in non‐isothermal rotordynamical systems

Variational Integrators and Fluid‐Structure‐Interaction at Low Reynolds‐Number

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