density

This research examines the rheological and density properties of starch-based compositions with variable ratios of components, focusing on potato and corn starches. Using glycerol as a plasticizer, the study evaluates the impact of concentration, starch content, and thermal conditions on the density, rheological, and structural behavior of the compositions. A simplex lattice method was employed to derive empirical models predicting the performance of these systems under diverse processing parameters.

The article presents the study results of air distribution in a room with a flat air jet. In particular, dynamic pressure, density and viscosity of air flow were considered. Aim of a paper is to numerically simulate these physical properties of a flat air jet in a room. A graphical representation of air jet parameters was obtained using package CFD Ansys FLUENT software. A hypothesis of applying Mendeleev-Clapeyron equation to moving air flow was considered. Flat air jets have been found to be effective in terms of velocity attenuation in indoor air distribution.

The effect of fuel oil on the environmental parameters of diesel fuel and the possibility of using it to reduce environmental pollution from road transport were investigated. It was established that fuel oil additives have a positive effect on the main parameters that can affect the ecology of diesel fuels and ensure their support according to Euro standards. The optimal concentrations of fuel oil additives for improving the environmental parameters of diesel fuel, such as density, viscosity, cetane index, boiling points of 10% and 50% fractions, were determined.

The deviation of density and viscosity values of oil mixtures from those calculated according to the additivity rule has been examined. Mathematical models have been developed for determining the properties of mixtures with different compositions taking into account the group composition of the source components. Mixtures containing components with a high content of alkanes and a low content of arenes have been found to be characterized by extreme deviations of density towards the maximum and kinematic viscosity towards the minimum.

The influence of the air-entraining agent (AEA) on a density, the volume of entrained air of mortar mix and compressive strength of hardened mortar was studied in this article. Results show that the addition of AEA results in the reduction of water to cement ratio to provide the targeted flow and the density that depends on the volume of entrained air. The addition of AEA causes the decrease of the density of mortar (C:S=1:2) by 8,2% and the increase of the compressive strength by 13,9% after 28 days of hardening compared to the mortar (C:S=1:2) without AEA.

Determining the physical parameters of geomaterials under high temperature and pressure conditions is necessary in connection with the fundamental issues of geology and geophysics. It is also aimed at solving applied problems, such as establishing relationships between physical parameters and chemical components of rocks under the earthly conditions of temperature and pressure.

The article deals with the workshop Urban Density Lab Vienna, that took place in Vienna in 2016 with the participation of students and professors from the Technical University of Vienna (TUV), the Department of Urban Planning (Stӓdtebau), NU "Lviv Polytechnic" (NULP), the Department of Urban Development and Architectural Design, the University of Los Andes In Bogotá (Universidad de los Andes, Bogotá). Workshop as a part of the design course of urban planning is an effective tool of the intensive designing process.

The article deals with the process of intensification of the urban territory of a historically formed city. The quarters of residential developments of different periods are analyzed and the indicators of density are determined. The urban transformations of a city canvas, which influence the changes in the density indices and their inter-dependence were investigated.

There has been considered a method of determination rocks density on the basis of the processing of the wave field of the acoustic log. The results of the borehole data processing are demonstrated.

The processes of consolidation, deconsolidation, phase transitions and destructions in the terms of internal structures of the Earth аre studied on the base of non-linear theory of deformable solid bodies.  It is shown that the loss of stability of equilibrium state can precede to the processes of deconsolidation, phase transitions and destructions on geometric form change (structural instability).