The formulation of an oil-based mud was made possible with the oil extracted from rubber seeds using famous soxhlet extraction method. formulated API standard 25 g bentonite to 350 mL base fluid. choice Rubber comes as a result its flash point and aniline which lies in range oils used for formulation. rheological properties OBM were beyond scope viscometer hence thinner added reduce viscosity s...

A novel liquid photo-polymerization resist was prepared for nanoimprint lithography on transparent flexible plastic substrates. The resist is a mixture of polymethylmethacrylate (PMMA), methylmethacrylate (MMA), methacylic acid (MAA) and two photo-initiators, (2-isopropyl thioxanthone (ITX) and ethyl 4-(dimethylamino)benzoate (EDAB)). The resist can be imprinted at room temperature with a press...

Numerical models of thermally activated convective flow in Earth's mantle do not resemble active plate tectonics because of their inability to model successfully the process of subduction, other than by the inclusion of artificial weak zones. Here we show, using a boundary layer argument, how the "rigid lid" style of convection favored by thermoviscous fluids leads to lithospheric stresses whic...

We show that continuum models for ideal plasticity can be obtained as a rigorous mathematical limit starting from a discrete microscopic model describing a viscoelastic crystal lattice with quenched disorder. The constitutive structure changes as a result of two concurrent limiting procedures: the vanishing-viscosity limit and the discrete-to-continuum limit. In the course of these limits a non...

An injection method has been adapted for the determination of copper concentration in untreated, undiluted serum by flame atomic absorption spectroscopy. Serum, 50 or 100 microliter, is automatically injected by a commercial microprobe system into a plastic cone connected to the capillary tube of the burner, at a rate of 240 samples per hour. The required sample volume is considerably decreased...

Atomic Force Microscopy (AFM) indentation on living cells in physiological medium is a well established technique used for investigation of the cell mechanical properties at nanoscale. However, interpretation of the experimental data obtained in such experiments is rarely a trivial task. This is happening because living cells have a complex response to the applied mechanical stress, response th...

We use the modified smoothed-particle hydrodynamics (MSPH) method to analyze shear strain localization in elasto-thermo-viscoplastic materials that exhibit strainand strain-rate hardening and thermal softening. A homogeneous solution of simple shearing deformations of the body is perturbed and the resulting initial-boundary-value problem analyzed by the MSPH method. It is found that the deforma...

Stress–strain response under constant and variable strain-rate is studied for selected models of inelastic behavior. The derived closed-form solutions for uniaxial loading enable simple evaluation of the strain-rate effects on the material response. The effect of an abrupt change of strain-rate is also examined. Non-Newtonian viscosity which decreases with an increasing strain-rate is incorpora...

Although the relations between the metabolic state and the mechanical properties of human red blood cells (RBC) continue to be of current interest, literature reports in this area are not in agreement. The present investigation was designed to determine several intrinsic mechanical properties of human RBC membranes before and after metabolic depletion via incubation at 37 degrees C for 24 hr. U...

Purpose. For a precise fit of multiple implant framework, having an accurate definitive cast is imperative. The present study evaluated dimensional accuracy of master casts obtained using different impression trays and materials with open tray impression technique. Materials and Methods. A machined aluminum reference model with four parallel implant analogues was fabricated. Forty implant level...