نتایج جستجو برای: viscous material
تعداد نتایج: 383258 فیلتر نتایج به سال:
The steady laminar stagnation point flow of an incompressible electrically conducting micropolar fluid impinging on a permeable flat plate with uniform suction/injection is considered. A uniform magnetic field is applied normal to the plate. The effect of viscous dissipation is taken into account. The governing partial differential equations are transformed into ordinary differential equations....
We show that two basic mechanical processes, the collision of particles and rolling motion of a sphere on a plane, are intimately related. According to our recent findings, the restitution coefficient for colliding spherical particles ǫ, which characterizes the energy loss upon collision, is directly related to the rolling friction coefficient μroll for a viscous sphere on a hard plane. We quan...
The time dependency of stress distribution in the supporting structures under dentures was simulated, under three loading conditions, by visco-elastic finite element stress analysis. In this simulation, viscoelastic material, was used as a model for soft tissue. The results indicate that the viscous flow of soft tissue and the loading position are factors determining stress intensity in the sup...
While many fluid instabilities involving free surfaces are governed by interfacial forces the classic example being surface tension real materials often have surface forces produced by physical processes not present in the bulk. A striking example of this is a viscoelastic micellar fluid, in which the long tubelike aggregates form at low concentrations due to the presence of an organic salt/cos...
The principle of material frame-indifference is a fundamental concept in classical physics. In 1972 Walter Noll showed that one can formulate constitutive laws without using any external frames of reference. Constitutive laws formulated in this way vacuously satisfy the principle of material frame-indifference. This thesis describes the basic concepts involved in formulating frame-free continuu...
Laser writing is used to structure surfaces in many different ways in materials and life sciences. However, combinatorial patterning applications are still limited. Here we present a method for cost-efficient combinatorial synthesis of very-high-density peptide arrays with natural and synthetic monomers. A laser automatically transfers nanometre-thin solid material spots from different donor sl...
Case 4: Presented by Alena Skalova, MD Clinical History 53-year-old woman with no remarkable medical history presented with painful left breast mass that had enlarged during the past year. Physical examination revealed a palpable, large, ill-defined lesion in the central area of left breast. No nipple discharge was noted. Surgical excision specimen consisted of 7x 5.5x 2.5 cm fibrofatty tissue ...
An entropic formulation of relativistic continuum mechanics is developed in the Landau-Lifshitz frame. We introduce two spatial scales, one being the small scale representing the linear size of each material particle and the other the large scale representing the linear size of a large system which consists of material particles and is to linearly regress to the equilibrium. We propose a local ...
We suggest a scalar model for deformation and flow of an amorphous material such as a foam or an emulsion. To describe elastic, plastic and viscous behaviours, we use three scalar variables: elastic deformation, plastic deformation rate and total deformation rate; and three material-specific parameters: shear modulus, yield deformation and viscosity. We obtain equations valid for different type...
Due to excellent thermo-mechanical properties, tungsten (W) is considered as a promising divertor material in ITER, full divertor in JET, first wall in DEMO and ASDEX Upgrade. During plasma disruptions and ELMs the W material can be severely damaged because of macroscopic melt losses resulting in short lifetime and plasma contamination. Therefore, understanding the underlying forces and physica...
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