scholarly journals CRUSHING CHARACTER OF SAND-SODIUM-SILICATE MIXTURES STRUCTURED BY STEAM-MICROWAVE TREATMENT

2020 ◽  
Vol 3 (62) ◽  
pp. 5-13
Author(s):  
L. Solonenko ◽  
◽  
S. Repiakh ◽  
K. Uzlov ◽  
T. Kimstach ◽  
...  
Keyword(s):  
Sodium Silicate ◽  
Quartz Sand ◽  
Standing Waves ◽  
Microwave Treatment ◽  
Product Knowledge ◽  
Radiation Frequency ◽  
The Core ◽  
Cast Product ◽  
Exponential Character ◽  
Technical Solutions

At the present, from among the known methods of sand-sodium-silicate mixtures structuring, the least studied, but the most promising, is the method of steam-microwave solidification. Among unexplored elements of steam-microwave solidification method is nature of mixtures destruction. This is especially important for determining the ways to increase the sand-sodium-silicate casting molds and cores strength before pouring and lowering their strength by the time when casting should be knocked out the mold and the core from cast product. Knowledge about mixture destruction nature is also necessary for appropriate technical solutions elaboration concerning sand regeneration. In this regard, the purpose of the present work has to be nature of sand-sodium-silicate mixtures structured by steam-microwave solidification method destruction establishing. Quartz sand cladded with sodium-silicate solute has been used in the present investigation. Mixture (cladded sand) structuring has been carried out by microwave radiation at nominal magnetron power of 700 W and radiation frequency of 2.45 GHz in area of standing waves. To cladded sand structuring, 1 g water portion has been added, which has been placed in bottom of container in which mixture has been microwave treated. To make decision on mixture destruction nature, images of structured mixtures destruction places within one grain (sand grain), which are typical for adhesive and cohesive character of destruction, obtained with scanning electron microscope have been used. It has been found that with sodium-silicate solute for quartz sand cladding mass content from 0.5 to 6 % (by weight) increasing, as well as with mixture processing by the method of steam-microwave solidification duration increasing, mixture compression ultimate strength increases according to dependence closed to exponential. Character of structured mixture destruction, in this case, is not depend on sodium-silicate solute used for quartz sand cladding content, but depends on steam-microwave solidification duration. With its time increasing it changes from adhesive to mix or from adhesive to mixed and cohesive.

scholarly journals Identification and management of the near-field knowledge of industrial design for innovative product shapes

2019 ◽  
Vol 11 (1) ◽  
pp. 168781401881657
Author(s):  
JinTao He ◽  
Qian Yang ◽  
MengYa Zhu
Keyword(s):  
Industrial Design ◽  
Near Field ◽  
Knowledge Systems ◽  
Design Knowledge ◽  
Product Knowledge ◽  
Innovative Product ◽  
Core Knowledge ◽  
Efficient Design ◽  
The Core ◽  
Complex Process

Industrial design is a complex process that contains multifarious product knowledge systems which play different roles at different stages of product development. Based on the research of different theories and methods of knowledge classification, the article proposes a new method which divides industrial design knowledge into knowledge in the field, near-field knowledge, and far-field knowledge, and established a corresponding frame of the design knowledge. In order to differentiate the near-field knowledge which is more innovative in design from considerable knowledge to facilitate an efficient design process, mechanisms of similarity searching are used. If 0.3 < [Formula: see text] (similarity) < 0.6, then define the case as the near-field product case and the relative knowledge as near-field knowledge. The core knowledge can be retrieved to drive innovative modeling. Furthermore, the process of a laptop design is taken as an example and validated using this method.

Theory and observations of waves on hollow-core vortices

1980 ◽  
Vol 99 (3) ◽  
pp. 495-511 ◽  
Author(s):  
Jakob J. Keller ◽  
M. P. Escudier
Keyword(s):  
Vortex Tube ◽  
Capillary Wave ◽  
Standing Waves ◽  
Wave Pattern ◽  
Interesting Case ◽  
Hollow Core ◽  
Core Size ◽  
Viscous Effects ◽  
Wave Problem ◽  
The Core

A linear non-homogeneous analysis is presented for the standing waves produced on the hollow core of an irrotational vortex by an arbitrary obstacle on the wall of the tube containing the vortex. The group-velocity criterion based upon Kelvin's corresponding dispersion relation predicts whether a certain asymptotic wave pattern appears upstream or downstream of the obstacle. The analysis leads to amplitude singularities for the standing waves at certain critical radii of the core. The particularly interesting case of a counter-helix for which the wave energy is propagating upstream appears for a first-mode angular disturbance. For this situation it seems to be possible that the helix ends in a hydraulic jump and is continued by a counter-helix downstream, as the core size gradually diminishes due to the deceleration of the flow caused by viscous effects (not included in the analysis). The capillary-wave pattern produced by surface tension is also considered. A brief outline for the analogous wave problem is given for the case where the fluid rotates like a rigid body.Photographic observations of hollow-core vortices in water flow are presented which confirm the qualitative predictions of the analysis, both for the response to an axisymmetric area contraction and also to a 90° bend at the downstream end of the vortex tube.

Study on Gas-Liquid Inclusions in Quartz Sand under Microwave Field

2012 ◽  
Vol 581-582 ◽  
pp. 689-693
Author(s):  
Qing Lin Hou ◽  
Jing Li ◽  
Rui Ming Yin ◽  
Lin Zhang Chen ◽  
Lu Li ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Fourier Transform Infrared Spectroscopy ◽  
Quartz Sand ◽  
New Technology ◽  
Acid Leaching ◽  
Fourier Transform Infrared ◽  
Microwave Treatment ◽  
Liquid Inclusion ◽  
Microscopic Morphology

The impurities and gas-liquid inclusions in quartz sand, which are from our country and UNIMIN Corporation respectively, were analyzed by Inductive Coupling Plasma Emission Spectrograph（ICP-AES）and Fourier Transform Infrared Spectroscopy (FT-IR). The results showed that the biggest difference between them was the content of gas-liquid inclusions. Thus, in order to improve the quality of our country high purity quartz sand, development of new technology to remove gas-liquid inclusions has been imperative. Method for removal of gas-liquid inclusions, using microwave radiation, was studied in this project. Meanwhile, the change of microscopic morphology of gas-liquid inclusion was observed by polarizing microscope. And the change of water content in gas-liquid inclusion was investigated by Fourier Transform Infrared Spectroscopy. Our results showed that micro-crack could be produced on the surface of gas-liquid inclusion under microwave treatment. The results also showed that new water molecules and liquid inclusions could be generated in the process. Furthermore, these liquid inclusions could be removed and H2O could be reduced by HF acid leaching.

scholarly journals CRITICAL SIZES OF STANDING NUCLEAR BURNING WAVES IN SYSTEMS WITH EXTERNAL CONTROL

2020 ◽  
pp. 16-22
Author(s):  
Yu.Ya. Leleko ◽  
V.V. Gann
Keyword(s):  
Mathematical Modeling ◽  
Standing Wave ◽  
Standing Waves ◽  
Spherical Shape ◽  
External Control ◽  
The Core ◽  
Mcnpx Code ◽  
Nuclear Burning ◽  
The Stability ◽  
Stability Limits

The theory of standing waves of nuclear combustion in reactors having a flat, cylindrical or spherical shape of the core is developed. A spherical standing wave occurs when nuclear burning propagates radially from the center of the sphere, and 238UO2 fuel moves to the center and is removed from the system. The stability limits of standing waves of nuclear burning are investigated. It has been established that for standing waves there are minimum (critical) sizes at which they exist. Mathematical modeling of standing waves using the MCNPX code was carried out and critical sizes of standing waves of various symmetries were determined.

scholarly journals Sand-sodium-silicate mixtures grains composition optimization for structuring by steam-microwave solidification method

2021 ◽  
Vol 1,2021 (1,2021(126)) ◽  
pp. 28-38
Author(s):  
Solonenko Lyudmila ◽  
Repyakh Sergei ◽  
Uzlov Kostiantyn
Keyword(s):  
Sodium Silicate ◽  
Quartz Sand ◽  
Gas Permeability ◽  
Beam Deflection ◽  
Solute Content ◽  
Allowable Level ◽  
Process Manufacturing ◽  
Composition Optimization ◽  
Simplex Lattice ◽  
Process Composition

Abstract. Mixture sizes of sand-sodium-silicate conglomerates and sodium silicate solute content in them influences on the basic physical and technological indicators of molding and core mixtures structured in steam-microwave environment have been investigated. Sand-sodium-silicate mixture structured by steam-microwave environment (steam-microwave solidification method – SMS-process) composition has been optimized. Standard and generally accepted methods and techniques of molding mixtures investigation have beenused in this study. For mixtures manufacturing have been used: quartz sand brand 1K2O202; sodium silicate solute with silicate modulus of 2.8…3.0 and specific gravity of 1.42…1.44 g/cm3. Quartz sand cladding has been implemented with 0.5 and 2.5% sodium silicate solute (by weight, over 100% sand). Sand-sodium-silicate conglomerates have been scattered in sieves and conglomerates with sizes less than 0.315mm and with sizes from 0.315 to 0.63mm have been used for research. Mixture composition has been optimized according to results of simplex planning and experimental data by simplex triangles constructing and superimposing their formatted images on each other with darkened fields between isolines that do not meet of each parameters required level. To plot simplex lattices, model with simplex lattice plan of incomplete cube in Scheffe’s triple system has been used. For the first time, influence of mixture sand-sodium-silicate conglomerates sizes and sodium-silicate-solute content in them on basic indicators of mold and rod mixtures structured in steam-microwave environment has been established, and their composition has been optimized. Data obtained will be useful in molds and rods structured by SMS-process manufacturing. They will have predictable indicators of properties that correspond to their allowable level. Optimal composition of sand-sodium-silicate mixture, structured by SMS-process, is mixture of quartz sand, part of which passed through sieve with cell of 0.315 mm and have sodium silicate solute content (МSiO2=2.8…3.0, 2=1.42…1.44 g/сm3) in amount of 1.5% (by weight, over 100% quartz sand). Keywords.Sand, silicon silicate solute, steam-microwave solidification, optimization, conglomerates, strength, gas permeability, crushability, density, beam deflection, knockout energy.

scholarly journals Water resistance of structured sand-sodium-silicate mixtures

2021 ◽  
pp. 41-46
Author(s):  
L.I Solonenko ◽  
S.I Repiakh ◽  
K.I Uzlov ◽  
I Mamuzich ◽  
O.P Bilyi ◽  
...  
Keyword(s):  
Sodium Silicate ◽  
Quartz Sand ◽  
Water Resistance ◽  
Average Particle Size ◽  
Storage Conditions ◽  
Water Soluble ◽  
Average Particle ◽  
Inversion Point ◽  
Relative Water ◽  
First Time

Purpose. To establish regularities of changes in sand-sodium-silicate mixtures (SSSM) relative water resistance, structured by steam-microwave solidification method (SMS), on their structuring parameters and sodium silicate solute (SSS) dissolution conditions. Methodology. Technical purity water, SSS with 2.83.0 silicate modulus, quartz sand with 0.23 mm average particle size were used in this work. Studies were carried out on quartz sand samples, which were preliminarily cladded with 0.52.5% (by weight) SSS and structured by SMS method. The fracture time of structured mixtures was evaluated on cubic specimens with 20 mm rib length, which were immersed in water at different temperatures. Findings. Changes in SSSM water resistance in water regularities depending on their manufacturing, use and storage conditions were established. Recommendations for SSSM rods removal from castings in water were developed. Originality. For the first time, it has been established that relative water resistance of the SSSM structured by SMS method decreases along with increase in water temperature in which it is destroyed. Depending on SSS mass used for quartz sand cladding in range 0.52.5%, water resistance dependence on treatment in steam-microwave environment with 27 minutes running time acquires an inversion character with inversion point `3.1 minutes into the processing. For the first time, it has been discovered that in boiling water the relative water resistance of SSSM, structured by SMS-process and having preheating, monotonically increases with preheating temperature rising from 100 to 600 , sharply increases when heated to 600700 and practically becomes absolute after preliminarily preheating to higher temperatures. Practical value. Research results will be useful in concepts of processes accompanying destruction of structured sands with water-soluble binders expanding, as well as in technologies and equipment development designed for SSS rods and mold rests removing from castings.

Preparation and Characterization of Functional Geopolymer

2008 ◽  
Vol 47-50 ◽  
pp. 977-979
Author(s):  
Yi He Zhang ◽  
Jing Xing ◽  
Li Yu ◽  
Jin Hong Li
Keyword(s):  
Fly Ash ◽  
Glass Fiber ◽  
Sodium Hydroxide ◽  
Sodium Silicate ◽  
Quartz Sand ◽  
Sodium Hydroxide Solution ◽  
Liquid Sodium ◽  
Hydroxide Solution ◽  
Structural Template

The geopolymer has been prepared from fly ash, metakaolin and Quartz sand, by using the liquid sodium silicate as structural template and sodium hydroxide solution as activator. The effect of glass fiber on the properties of the geopolymer has been studied.

scholarly journals Phosphorus Elimination at Sodium Silicate from Quartz Sand Roasted with Complexation using Chitosan-EDTA

2018 ◽  
Vol 333 ◽  
pp. 012050
Author(s):  
S Wahyuningsih ◽  
A H Ramelan ◽  
N S Suharty ◽  
M Handayani ◽  
F Firdiyono ◽  
...  
Keyword(s):  
Sodium Silicate ◽  
Quartz Sand

scholarly journals Creative AI and Musicking Robots

2021 ◽  
Vol 8 ◽  
Author(s):  
Craig Vear
Keyword(s):  
Experiential Learning ◽  
Real Time ◽  
Intelligent Systems ◽  
Computational Learning ◽  
Design Development ◽  
Shared Experience ◽  
The Core ◽  
Central Case ◽  
Technical Solutions

This article discusses the creative and technical approaches in a performative robot project called “Embodied Musicking Robots” (2018–present). The core approach of this project is human-centered AI (HC-AI) which focuses on the design, development, and deployment of intelligent systems that cooperate with humans in real time in a “deep and meaningful way.”1 This project applies this goal as a central philosophy from which the concepts of creative AI and experiential learning are developed. At the center of this discussion is the articulation of a shift in thinking of what constitutes creative AI and new HC-AI forms of computational learning from inside the flow of the shared experience between robots and humans. The central case study (EMRv1) investigates the technical solutions and artistic potential of AI-driven robots co-creating with an improvising human musician (the author) in real time. This project is ongoing, currently at v4, with limited conclusions; other than this, the approach can be felt to be cooperative but requires further investigation.

scholarly journals Sand-sodium-silicate mixtures structured in steam-microwave environment effective values of thermo-physical properties

2021 ◽  
pp. 66-71
Author(s):  
L.I Solonenko ◽  
S.I Repiakh ◽  
K.I Uzlov ◽  
A.V Dziubina ◽  
S.O Abramov
Keyword(s):  
Cast Iron ◽  
Physical Properties ◽  
Sodium Silicate ◽  
Apparent Density ◽  
Quartz Sand ◽  
Thermal Activity ◽  
Solute Content ◽  
Graphite Cast Iron ◽  
Pass Through ◽  
Thermo Physical Properties

Purpose. Sand-sodium-silicate mixtures, structured by steam-microwave solidification, thermo-physical properties integral-effective values during Al-Mg alloy and graphite cast iron pouring determination. Sand-sodium-silicate mixture apparent density changing according to quartz sand, cladded with sodium silicate solute, fractional composition and its influence on BrA9Zh3L bronze microstructure establishment. Methodology. Quartz sand with 0.23 mm average particle size, sodium silicate solute, aluminum alloy with 8.5% Mg, flake graphite cast iron SCh200 (DSTU 8833:2019), bronze BrA9Zh3L (GOST 493-79) were used. Mixtures structuring was carried out in 700 W magnetron power microwave furnace. Sand-sodium-silicate mixture thermo-physical properties integral-effective values were calculated by G.A.Anisovich method, using castings results and molds thermography. Structured mixtures apparent density was determined on samples 50 120 mm dimension. Metallographic studies were realized using Neophot-21 optical microscope. Findings. It was found that with sodium silicate solute, used for sand cladding, amount increasing from 0.5 to 3% mold material apparent density decreases and thermal activity lowers. This leads to castings grains size increasing. Mixture sodium silicate solute content was recommended limiting 1.5% for fine-grained microstructure castings obtaining and cladded sand using, which particles pass through mesh side less 0.315 mm sieve. Sands with sodium silicate solute content more than 1.5%, which dont pass through sieve 0.4 mm mesh side, were recommended as casting molds heat-insulating material using. Originality. For the first time, when aluminum-magnesium alloy and graphite cast iron pouring, quartz sand cladded with sodium silicate solute in amount from 0.5 to 3.0% (weight, over 100% quartz sand), steam-microwave radiation structured, thermo-physical properties integral-effective values were determined. Practical value. Data obtained using will improve castings solidification time and rate analytical calculations accuracy, forecast level and residual stresses sign in them, shrinkage defects locations. This will reduce casting technology developing time and costs and castings manufacturability.

Sign in / Sign up

Export Citation Format

Share Document