1,720,968 research outputs found
Clastic rock / claystone / mudrock simulation at the microscale: different modeled forms of geological detritus for weathering simulation
No full textAn actual problem of the natural weathering modeling is separation of chemical weathering and physical erosion in the framework of complex dynamics of the atmosphere and the Earth surface, despite the fact of a close coupling between the chemical weathering and physical erosion in natural landscapes. It's intuitively obvious that the multifactor nature of the weathering pattern generation is the cause of the impossibility of experimental reproduction of the complexity of the global weathering using singular factor experiments. Different factors (cryo-, glacio-, hydro-, photo-, chemo-, etc.) can be simulated using specified weatherometers, but the large size of the samples and the long timescale of their weathering usually provide very poor reproducibility of the natural weathering patterns in such experiments. Thus, it is necessary to provide the lowest spatial level of the model (using similarity criteria and dimensional analysis) and the lowest timescale of the full erosion and weathering process of the samples. We propose the integration of ESEM (environmental scanning electron microscopy) and CLEM (correlated light and electron microscopy) with the high power light sources for synchronous observation and weathering-like processing of the model geological or synthetic weatherable and erodible materials. Also we propose the cryogenic (and thermo-cryo cycled) electron microscopy variations for modeling of glatiological phenomena of weathering and erosion – for example, for modeling of periglacial weathering and headwall erosion in glaciers and modeling of selective or combined glacial erosion and weathering in the coastal mountains. The effect of hydrochemical factors can be modeled using CLESEM with stopped-flow and continuous flow subchambers, including our mesofluidic modifications of such instruments
Dune system waveform evolution simulation on the terylene substances using Olson's dynamical analogies, similarity criteria and dimensional analysis
No full textIt is well known that sand waves are formed by the action of either wind or water (through the waves or tidal currents). Modeling of the evolution of tidal sand waves is the basis of marine and river dune dynamics. Both the river dunes and tidal sand waves are generated by the same physical mechanisms. Hence, it is possible to simulate such phenomena using uniform or similar equations, which can be explicated not only for the linear scales, but also for nonlinear systems and non-stationary boundary conditions. Morphodynamic modeling of tidal sand waves is usually performed using computer software algorithms, but the aim of our work is realization of direct physical modeling of tidal sand waves based on chemically different media using several hydrodynamical / hydraulical similarity criteria and principles of the unified interpretation of the wave phenomena in the framework of nonlinear physics. We also use the scaling principles for microscopic simulation of the effects observed on the mesoscopic and "macroscopic" levels (sensu lato), for direct observation of them at the microscopic level using complex electron microscopy instrumentation
Enhanced local photon responce microscopy reconstruction of mineral colloid structures and aggregates - Technico-methodical exapmle
No full textEnhanced local photon responce microscopy reconstruction of mineral colloid structures and aggregates - Technico-methodical exapml
Upright microscopy of artificial collomorphic structures
No full textUpright microscopy of artificial collomorphic structure
Laser diode projection microscopy of mineral colloid structures (Dünnschliff technique) - Technico-methodical exapmle
No full textLaser diode projection microscopy of mineral colloid structures (Dünnschliff technique) - Technico-methodical exapml
Towards the lava flow physical modelling using Olson's dynamical analogies, similarity criteria and dimensional analysis implemented for the melting polymers in SEM or ESEM sub-chambers
No full textThe "lava flow modeling" is known to be a very extensible term covering different processes from the analog experiments of the lava flow emplacement and direct digital simulations (such as 3D modeling of lava flows using smoothed particle hydrodynamics and FEM-based modeling including finite-difference numerical approximations) to SCIARA- and MAGFLOW-based cellular automata lava flow modeling and its applications for hazard predictions. Despite this fact the physical basis of all the above models includes the rheology of the underlying substance. Consequently, it is possible to simulate the effects/phenomena of lava distribution, including bifurcation-determined ones, using the unified principles, explicated from the physical chemistry and rheology of viscous polymers, including reaction-diffusion mechanisms and nonlinear wave's physics. Our study was focused on reconsideration of the analog modeling based on physical similarity conditions and criteria, which made it possible to simulate such phenomena using uniform or similar equations, which can be explicated not only for linear scales, but also for nonlinear systems and non-stationary boundary conditions. The aim of our work is physical modeling of the lava flow based on chemically different media using hydrodynamical and hydraulical similarity criteria and principles of the unified interpretation of the wave phenomena in the framework of nonlinear physics. Also we apply the scaling principles for microscopic simulation of the effects, observed on either mesoscopic or macroscopic levels, for direct observation of them at the microscopic level using complex electron microscopy instrumentation
Microwave-induced self-organization in mineral systems. III. FeCl3 colloid (200 W; 2.45 GHz; 1 min)
No full textMicrowave-induced self-organization of membraneous structures with different morphology in hydrolized FeCl3 colloid (200 W, 2.45 GHz,1 min). The local MW treatment conditions and the precoursor layer thickness determine the type of emerging structures
Microwave-induced self-organization in mineral systems. VI. Saturated FeOOH sol obtained from FeCl3 and Na2CO3 solutions (2.45 GHz; 200 W; 1 min)
No full textMicrowave-induced self-organization of ferric hydroxide colloids obtained from ferric chloride and sodium carbonate solutions results in the crystallization of different mineral phases, including the excess sodium carbonate, with the crystal morphology depending on the microwave irradiation power and irradiation time
Microwave-induced self-organization in mineral systems. II. Prussian blue (conentrated sol; 2.45 GHz; 450 W; 2 min). Erosion and reticulation
No full textIn this dataset cycle we consider a multifactor nature of the self-organization procees of soft matter dissipative microstructures from the iron-containing colloidal precursors with different particle size under microwave irradiation. The resulting structures' morphology determined by the dehydration-aggregation procees under the microwave field, as well as their phase state, chemical composition and the degree of crystallinity, are shown to be dependent on the irradiation time, the microwave field power and the particle size of the chemical "precursor"
Microwave-induced self-organization in mineral systems. V. FeCl3 colloid (800 W; 2.45 GHz; 30 sec.)
No full textMicrowave-induced self-organization in FeCl3 colloids under high irradiation power (800 W) is strongly dependent on the layer thickness of the precursor (saturated ferric chloride solution) and results in less diversity of membraneous structure morphologies because of the too fast water evaporation preventing hydrolytic polycondensation and favoring simple crystallization of the mineral phases
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