Dynamic Instability in Low-Cohesive Soils

Dynamic behavior of natural and model low-cohesive soils has been studied. All these silty-sandy soils demonstrated dynamic dilatancy with the exception of dense dry specimens and tended to liquefy if the degree of saturation Sr \u3e 0.9. Beginning from the clay content about 1.5% by weight thixotropic hardening of low-cohesive soils can be registered and the relationship of this hardening versus normalized specific surface of the soils, calculated from BET equation, can be represented by a smooth S-shaped curve with three distinct parts characteristic for dilatant (cohesionless), dilatantly-thixotropic (low-cohesive) and quasi-thixotropic (cohesive) soils

Zoning of the Kazan City territory by the stability of foundation soil during dynamic impact

© 2017, Advanced Engineering Solutions [AES.COM] Ottawa, Canada. All rights are reserved. The article presents the results of zoning of the Kazan City territory by dynamic instability of the foundation soils. The work is based on mathematical analysis of databases of the geological environment digital model constructed by the results of drilling more than one thousand boreholes. This GIS model incorporates all the environment components necessary to evaluate the occurrence possibility of soil dynamic instability patterns: spatial location of sands, their grain-size composition and the database of mechanical properties of soils and rocks. A complex of some criteria such as the soil occurrence depth, degree of humidity, relative density made it possible to distinguish the soil conditions subtypes and also to construct the map of potentially possible dynamic instability for the city territory

Simulation of the processes of plasma modification and vacuum metallization of polymer materials by the method of molecular dynamics

The article presents the results of the development of molecular dynamics models of modifications of polypropylene (PP) material in the plasma of a radio-frequency (RF) discharge and a copper coating deposit by magnetron sputtering on the surface of a polyethylene (PE) material. The model of the RF plasma modification process describes changes in the surface layers of the PP material upon interaction with low-energy plasma ions: the nature of the breaking of covalent bonds in macromolecules, the chemical composition of sputtered particles, and changes in the ordering of the supramolecular structure. The model of the vacuum metallization process describes the processes of the introduction of metal atoms into the polymer structure, the change in the conformation of macromolecules, the formation of macroradicals with uncompensated chemical bonds, and the formation of an interfacial layer between the polymer and the metal coating

STUDY OF THE EFFECT OF HIGH-FREQUENCY CAPACITIVE PLASMA TREATMENT ON CAPILLARY PROPERTIES OF BASALT FABRICS

Were studied the capillary of basalt fiber after low-temperature plasma treatment in radio-frequency capacitive discharge. It was established experimentally increase in the height of the capillary rise of water for the treated sample

RESEARCH OF THE INFLUENCE OF HIGH-FREQUENCY PLASMA TREATMENT ON THE ABSORPTION TIME OF WATER IN BASALT TISSUE

The influence of different high-frequency plasma modes on the absorption time of water in basalt tissue has been investigated. It has been established that, depending on the parameters of high-frequency plasma treatment, it is possible to achieve both hydrophobicity and increased hydrophilicity of basaltic tissues

TWO-STEP MODIFICATION OF TEXTILE MATERIALS WITH MEMBRANE COATING

The possibility of using a two-stage plasma modification for improving the hygienic properties of textile materials with a membrane coating in order to improve steam, air permeability and water resistance was studied

RESEARCH OF HYGIENIC PROPERTIES OF POROUS POLYETHYLENE FILMS WITH CaCO3

The complex of hygienic properties of polymeric polyethylene (PE) films with mineral filler СаСО3 is experimentally investigated

RESEARCH OF STRUCTURE OF POROUS POLYETHYLENE FILMS BASED ON A MINERAL FILLER

In the paper, polymer polyethylene films with a mineral filler CaCO3 were studied by gas dynamic porosimetry

Metabolic dysregulation in vitamin E and carnitine shuttle energy mechanisms associate with human frailty

Global ageing poses a substantial economic burden on health and social care costs. Enabling a greater proportion of older people to stay healthy for longer is key to the future sustainability of health, social and economic policy. Frailty and associated decrease in resilience plays a central role in poor health in later life. In this study, we present a population level assessment of the metabolic phenotype associated with frailty. Analysis of serum from 1191 older individuals (aged between 56 and 84 years old) and subsequent longitudinal validation (on 786 subjects) was carried out using liquid and gas chromatography-mass spectrometry metabolomics and stratified across a frailty index designed to quantitatively summarize vulnerability. Through multivariate regression and network modelling and mROC modeling we identified 12 significant metabolites (including three tocotrienols and six carnitines) that differentiate frail and non-frail phenotypes. Our study provides evidence that the dysregulation of carnitine shuttle and vitamin E pathways play a role in the risk of frailty

Measures of frailty in population-based studies: An overview

Although research productivity in the field of frailty has risen exponentially in recent years, there remains a lack of consensus regarding the measurement of this syndrome. This overview offers three services: first, we provide a comprehensive catalogue of current frailty measures; second, we evaluate their reliability and validity; third, we report on their popularity of use