scholarly journals Improvement of Rheological Properties of Soil Structure Based on Lignite Dispersion

2019 ◽  
Vol 8 (11) ◽  
pp. 3700-3704
Keyword(s):  
Physical Properties ◽  
Rheological Properties ◽  
Relative Position ◽  
Time Variation ◽  
Soil Structure ◽  
Constant Strain Rate ◽  
Rheological Parameters ◽  
Stress And Strain ◽  
Relaxation Processes ◽  
Properties Of Soil

This article examines the change in stress and strain media, in particular natural leonardite (brown coal), prepared for grinding and during grinding, due to the restructuring of the material, i.e. changes in the relative position and deformation of the elements of the structure, including at the level of macromolecules that are inert to the deformation and relaxation processes, provide important for the technology to use improved rheological properties of the soil structure based on dispersion of leonardite, information about the physical properties of the material and its structure. The time variation of the stress in an inert-viscous-elastic medium with a constant strain rate depending on the values of the rheological parameters, it is possible to occur by three laws: aperiodic (steady), critical and oscillatory damp

From the results of the stability of soil structure studies and the physical characteristics of the black meadow soil of the mountain meadow in the limited national park (gorkhi-terelj national park)

2018 ◽  
Vol 22 (03) ◽  
pp. 89-95
Author(s):  
Lkhamsuren B ◽  
Odgerel B ◽  
Purevsuren Sh
Keyword(s):  
Physical Properties ◽  
Vegetation Cover ◽  
National Park ◽  
Soil Structure ◽  
Soil Stabilization ◽  
Meadow Soil ◽  
Mountain Meadow ◽  
Stability And Stabilization ◽  
The Stability ◽  
Properties Of Soil

The study aims to investigate changes in the physical properties of soil depending on the utilization conditions of the Special Protected National Park compared to the area fenced for more than 10 years. The stability and stabilization of the stabilized mountain meadow soil stabilization and physical properties of soil in the Gorkhi-Terelj National Park (GTNP) resort and limited concentration of tourism. As a result of the study, the stability of the soil structure was 2.8 points in the area of vegetation cover 0-3 cm outside the fence, while the 2.6 layered soil layers above the soils of the vegetation cover. However, the area with vegetation cover within the fence is 4.2 points in soil 0-3 cm and 4 leaves in soil without vegetation cover.

scholarly journals Influence of plasma on the physical properties of ointments with quercetin

2017 ◽  
Vol 67 (4) ◽  
pp. 569-578
Author(s):  
Beata Szulc-Musioł ◽  
Barbara Dolińska ◽  
Justyna Kołodziejska ◽  
Florian Ryszka
Keyword(s):  
Shear Stress ◽  
Physical Properties ◽  
Rheological Properties ◽  
Rheological Parameters ◽  
Organoleptic Properties ◽  
Independent Variables ◽  
Newtonian Systems ◽  
Two Independent Variables

Abstract Effects of two independent variables - the content of quercetin (0 or 1 or 1.5 or 5 %) and the content of plasma (0 or 2 or 4 or 6 %) - on the organoleptic properties and rheological parameters of model formulations prepared on an amphiphilic base were estimated. The consistency of all ointments was uniform, and the content of quercetin and plasma lay within the predefined range. Tested ointments are non-Newtonian systems. The content of quercetin and plasma was found to have a significant effect on the rheological properties of the ointments. An increase in the content of plasma in ointments was accompanied by a significant increase in their hardness, viscosity and shear stress and a reduction of their spreadability. The best rheological properties were shown by formulation F-3, containing 1.5 % of quercetin and 2 % of plasma.

Effect of soil structure on wheat germination in a red-brown earth

1955 ◽  
Vol 6 (6) ◽  
pp. 797 ◽  
Author(s):  
DS McIntyre
Keyword(s):  
Physical Properties ◽  
Soil Structure ◽  
Pore Space ◽  
Oxygen Deficiency ◽  
Heavy Rain ◽  
Physical Measurements ◽  
Wheat Germination ◽  
Permanent Rotation ◽  
Formed Part ◽  
Properties Of Soil

Physical properties of soil have been measured on two experimental plots which showed high compaction and poor germination of wheat under very wet conditions. The plot treatments were a two-course and a four-course rotation, and formed part of a permanent rotation trial at the Waite Institute. Similar physical properties were measured for thick crusts formed on these cultivated soils. Under the wet conditions pore space available for air was low in both plots, and within the crust itself was almost zero. Significant differences were found in bulk density and water-stable aggregation between treatments. Waterstable aggregation was very low under both treatments compared with that in virgin soil. All physical measurements point to an oxygen deficiency for a period of 2-3 weeks, and this could account for the poor germination and poor early growth, particularly in the two-course rotation plots. The bad structure conditions leading to this are probably due to pulverizing by implements and dispersion over the years by heavy rain, rather than to decrease in organic matter.

scholarly journals Influence of Digestate on Physical Properties of Soil in ZD Budišov

2019 ◽  
Vol 67 (1) ◽  
pp. 75-83 ◽  
Author(s):  
Stanislav Jaša ◽  
Barbora Badalíková ◽  
Jan Červinka
Keyword(s):  
Soil Fertility ◽  
Physical Properties ◽  
Bulk Density ◽  
Soil Structure ◽  
Physical State ◽  
Crop Yields ◽  
Crop Establishment ◽  
Air Capacity ◽  
Properties Of Soil

One of the main objectives of crop establishment is adjustment of physical properties of soil, on which indicators of soil fertility as well as economic appreciation of the resulting yield depend. During 2014–2016 yield of corn and sorghum was observed in semi‑operational experiments of ZD Budišov in relation to the quantity of the applied digestate and simultaneously, the following physical properties of soil were analysed: porosity, compaction and soil structure. After the application of digestate the porosity and minimal air capacity decreased, and reduced bulk density increased. Soil structure was affected negatively too. Overall, a trend of degradation of physical state of soil in variant with doubled dose of applied digestate was registered. Yields were always higher in variants with digestate due to a higher supply of higher amount of nutrients. Results of this observation indicate that crop yields may be higher but at the same time physical properties of soil may be impaired which may, while increasing doses of digestate, lead to irreversible degradation of soil.

scholarly journals Influence of biopolymers on the rheological properties of seafloor sediments and the runout behavior of submarine debris flows

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Jun Kameda ◽  
Hamada Yohei
Keyword(s):  
Rheological Properties ◽  
Debris Flows ◽  
Extracellular Polymeric Substances ◽  
Flow Behavior ◽  
Mass Movement ◽  
Rheological Parameters ◽  
Natural Environments ◽  
Natural Systems ◽  
Chemical Conditions ◽  
Seafloor Sediments

AbstractSubmarine debris flows are mass movement processes on the seafloor, and are geohazards for seafloor infrastructure such as pipelines, communication cables, and submarine structures. Understanding the generation and run-out behavior of submarine debris flows is thus critical for assessing the risk of such geohazards. The rheological properties of seafloor sediments are governed by factors including sediment composition, grain size, water content, and physico-chemical conditions. In addition, extracellular polymeric substances (EPS) generated by microorganisms can affect rheological properties in natural systems. Here we show that a small quantity of EPS (~ 0.1 wt%) can potentially increase slope stability and decrease the mobility of submarine debris flows by increasing the internal cohesion of seafloor sediment. Our experiments demonstrated that the flow behavior of sediment suspensions mixed with an analogue material of EPS (xanthan gum) can be described by a Herschel–Bulkley model, with the rheological parameters being modified progressively, but not monotonously, with increasing EPS content. Numerical modeling of debris flows demonstrated that the run-out distance markedly decreases if even 0.1 wt% of EPS is added. The addition of EPS can also enhance the resistivity of sediment to fluidization triggered by cyclic loading, by means of formation of an EPS network that binds sediment particles. These findings suggest that the presence of EPS in natural environments reduces the likelihood of submarine geohazards.

scholarly journals III. The influence of stress and strain on the physical properties of matter. Part III. Magnetic induction

1887 ◽  
Vol 42 (251-257) ◽  
pp. 224-230 ◽  
Keyword(s):  
Physical Properties ◽  
Magnetic Induction ◽  
Central Portion ◽  
Secondary Coil ◽  
Stress And Strain ◽  
Iron Nickel ◽  
Considerable Length ◽  
The Wire ◽  
Effects Of Stress

The author lays before the Society the results of experiments extending over a period of ten years on the effects of stress and strain on the magnetic permeabilities of iron, nickel, and cobalt. Two methods were employed. In one the metal to be tested—usually in the form of wire—was placed with its axis coincident with that of a magnetising solenoid, in most cases of considerable length as compared with the diameter of the wire; round the central portion of the solenoid was wrapped a secondary coil .

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