Objective: to analyze the effect of non-toxic components on physical andchemical characteristics drilling fluids. Methodology: determination (density, plastic viscosity, yield point, effective gel strength, water cut, mud cake thickness), chemical (ph). results: threeиdifferent fluids were prepared, their and studied, a Comparative analysis was carried out, impact marine ecosystem assessed. Con...

This paper presents nonlinear finite element (FE) models to predict time- and temperature-dependent responses of shape memory polymer (SMP) foams in the large deformation regime. For first time, an A SMP foam constitutive model is implemented ABAQUS FE package with aid a VUMAT subroutine thermo-visco-plastic behaviors. phenomenological reformulated adopting multiplicative decomposition gradient...

The effect of polycarboxylate superplasticizer on the fluidity and rheology cement - silica fume water paste was investigated. changes dispersion degree, yield stress plastic viscosity with different content were analyzed. results show that rheological properties conform to Herschel-Bulkley model. shear thinning slurry is manifested as a typical yielding pseudoplastic fluid characteristic. When...

Abstract The molecular weight of the macromonomer has a great influence on performance Polycarboxylate Superplasticizer (PCE). PCE with different structures was prepared by using methylallyl polyoxyethylene ether (HPEG) weights 2400, 3000, 4000, and 5000. effects emptying time rheological properties cement paste concrete were investigated. test results show that paste, plastic viscosity ratio i...

The paper presents the effect of powders obtained from egg-shells and limestone on rheological properties cement pastes. Both were added to Portland CEM I 42.5 R, 30% by mass. higher yield stress plastic viscosity pastes prepared with addition eggshell powder, compared made explained influence membrane its chemical structure. membrane, which absorbs water expands in paste, is causing an increas...

Boran rice is a typical food from Lamongan Regency. The hallmark of boran lies in its different seasonings other cooking spices. seasoning can only be found Regency at this time, and the method presentation still simple, so further product development necessary. This study aims to determine most critical factors best alternative developing products. used Value Engineering (VE) method. Applying ...

Poiseuille's equation describes the relationship between fluid viscosity, pressure, tubing diameter, and flow, yet it is not known if cold organ perfusion systems follow this equation. We investigated these relationships in an ex vivo model and aimed to offer some rationale for equipment selection. Increasing the cannula size from 14 to 20 Fr increased flow rate by a mean (SD) of 13 (12)%. Mars...