scholarly journals A new technological approach to the granulation of slag melts of ferrous metallurgy: obtaining glassy fine-grained granules of improved quality

2021 ◽  
Vol 68 (1) ◽  
Author(s):  
David Sakhvadze ◽  
Gigo Jandieri ◽  
Giorgi Jangveladze ◽  
Giorgi Sakhvadze
Keyword(s):  
High Speed ◽  
New Technology ◽  
Pilot Scale ◽  
Fine Grained ◽  
Three Phase ◽  
Metallurgical Slags ◽  
Phase Water ◽  
Slag Melts ◽  
Further Development

AbstractThe technological factors required to improve the operational properties of granulated metallurgical slags demanded in the building industry have been analyzed. In order to satisfy these factors, a new technology for hydro-vacuum granulation of slag melts (HVG) has been developed. It is shown that the main advantage of the proposed HVG process is the provision of forced high-speed vortex convection of water, with the effect of vertical suction, crushing, and degassing of the three-phase (water–slag granules–water vapor) heterogeneous medium formed during the overcooling and solidification of slag. It is proved that the high-speed volumetric disintegration and overcooling with the degassing effect sharply reduces a degree of aggressive gas/vapor impact on the being cooled particles of slag, which, in turn, leads to the reduction of the perforation degree of the granules. The obtained granules are distinguished by stable fractionation and improved, well-defined dense amorphous glassy structure, the water-holding capacity of which has reduced from 45–50% to 25–13%, the actual moisture content from 24–20% to 6–4%, while the hydraulic activity in terms of CaO-uptake increased from the conventional 320–360 mg/g to 610–650 mg/g. Pilot scale research demonstrated that the designed equipment for the HVG technology allows sustainable control of the quality of granules, and it has the potential for further development and implementation.

Design Principles for Interactive Learning Environments with Embedded Formative Assessments

2009 ◽  
pp. 157-170
Author(s):  
Sara Dexter
Keyword(s):  
Learning Environments ◽  
New Technology ◽  
Design Principles ◽  
Interactive Learning Environments ◽  
Formative Assessments ◽  
Assessment Tools ◽  
Traditional View ◽  
Further Development ◽  
Forms Of Knowledge

The new technology-enhanced conception of assessment stands in contrast to the traditional view of assessments as tests of a learner’s ability to recall facts. Because technology mediates learning in new ways, it engenders new forms of knowledge as well as possibilities for documentation and analysis. Many have noted that games, simulations, and cases are engaging for learners and thus warrant further development for their expanded use. Research on learning and assessment suggests design principles that developers should follow when investing such effort in order to capitalize on how the interactive aspects of these tools can serve as assessments about what, how, and when learning is occurring. The ETIPS application described here serves as an example of how such principles can be used to guide priorities and decisions for developers as well as applied as criteria for determining the quality of such digital tools as learning environments and assessment tools.

Development of Generation Technology of High Quality Semi-Solid Slurry by Double-Axis-Electromagnetic Stirrer Combined with Properly Designed Cup

2012 ◽  
Vol 192-193 ◽  
pp. 441-446
Author(s):  
Masayuki Itamura ◽  
Koichi Anzai ◽  
Naoya Hirata ◽  
Shinichi Shimaski ◽  
Takuma Maeda
Keyword(s):  
Magnetic Field ◽  
High Speed ◽  
Low Cost ◽  
New Technology ◽  
Casting Process ◽  
Rotating Magnetic Field ◽  
High Quality ◽  
Semi Solid ◽  
Cup Design

For the semi-solid casting process it is very important to make high quality slurry with high speed and low cost. Recently the double-axis-electromagnetic stirrer is developed as the slurry-making tool. This stirrer has rotating magnetic field (RMF) and linear traveling magnetic field (TMF). This new technology shows several advantages in the quality of slurry. The cup design is also important to make uniform quality slurry. In this paper the new stirrer and its advantages from test report and technology of cup design is introduced.

Design Principles for Interactive Learning Environments with Embedded Formative Assessments

2011 ◽  
pp. 687-700
Author(s):  
Sara Dexter
Keyword(s):  
Learning Environments ◽  
New Technology ◽  
Design Principles ◽  
Interactive Learning Environments ◽  
Formative Assessments ◽  
Assessment Tools ◽  
Traditional View ◽  
Further Development ◽  
Forms Of Knowledge

The new technology-enhanced conception of assessment stands in contrast to the traditional view of assessments as tests of a learner’s ability to recall facts. Because technology mediates learning in new ways, it engenders new forms of knowledge as well as possibilities for documentation and analysis. Many have noted that games, simulations, and cases are engaging for learners and thus warrant further development for their expanded use. Research on learning and assessment suggests design principles that developers should follow when investing such effort in order to capitalize on how the interactive aspects of these tools can serve as assessments about what, how, and when learning is occurring. The ETIPS application described here serves as an example of how such principles can be used to guide priorities and decisions for developers as well as applied as criteria for determining the quality of such digital tools as learning environments and assessment tools.

Research on Hydro-Dynamic of Column Body Water-Entry with Six-DOF at High-Speed

2014 ◽  
Vol 533 ◽  
pp. 40-43
Author(s):  
Shan Qi Wu ◽  
Xing Wu Kang
Keyword(s):  
Numerical Calculation ◽  
Flow Field ◽  
High Speed ◽  
Water Entry ◽  
Attitude Angle ◽  
Three Phase ◽  
Natural Cavitation ◽  
Six Dof ◽  
Phase Water ◽  
And Control

By using the commercial CFD software Fluent6.3, the three-phase (water, air, vapour) flow field with natural cavitation was established. The UDF(User Defined Function) was used to resolve and control the missiles movement. It realized the numerical calculation of unsteady high-speed water-entry flow field, which consider natural cavitation as well as the missiles multiple degree of free movement. In this paper, the missile high-speed water-entry flow field with different attitude angle were simulated and analyzed, and the influence of the attitude angle on the flow field were gained.

Distribution Calculation of Harmonics and Unbalance in Power System Including Railway Traction Substations

2012 ◽  
Vol 433-440 ◽  
pp. 3470-3478
Author(s):  
Jun Yong Wu ◽  
Hong Jun Fu ◽  
Jian Hua Sun ◽  
Xi Lu Zhang ◽  
Lu Yu Ji
Keyword(s):  
Power System ◽  
High Speed ◽  
Power Flow ◽  
Electric Power System ◽  
Distribution Calculation ◽  
Three Phase ◽  
Railway Traction ◽  
Traction Substations ◽  
Decoupled Method

Harmonics and unbalance in Henan power system become more and more serious while a large number of traction substations of high-speed railway are put into operation and traction power increases. In this paper, the distributions of harmonics and unbalance in Henan electric power system are studied. Firstly, three-phase fundamental and harmonic models of the whole system including railway traction substations are built, and a decoupled method of power flow is put forward. Then, the power system harmonic penetration (PSHP) software package is developed, and the power quality of two railway traction substations has been measured. At last, the distributions of harmonics and unbalance of Zhengzhou power network are calculated and compared with the measured results under different traction powers. Some rules of the distributions have been summarized and some advices have been put forward.

High-Speed Cropping of Rods and Wire with Superposition of Various Stress Conditions

2015 ◽  
Vol 651-653 ◽  
pp. 132-137 ◽  
Author(s):  
Robinson Henry ◽  
Mathias Liewald
Keyword(s):  
High Speed ◽  
Raw Materials ◽  
High Productivity ◽  
Geometrical Properties ◽  
Study Materials ◽  
Stress Superposition ◽  
The Difference ◽  
Further Development

In the manufacturing of mass products, material and energy costs are an important part of the total costs. Competitiveness in the production of raw materials can only be maintained if waste of material is minimized and a high productivity is ensured. An outcome of these efforts is the further development of conventional cropping. High-speed cropping is characterized by the cropping speed as far as tooling is concerned. The cropping tool is accelerated up to a blade speed of 8 to 10 m/sec. This increase in cropping speed influences the surface quality of the specimens.This paper is mainly focused on the experimental investigation into the high-speed cropping in bulk metal forming. The first part of this investigation presents a comparison between conventional and high-speed cropping to demonstrate the difference between both methods. In this case study, materials of different mechanical strength are examined. The produced specimens are analysed with an optical system (GOM ATOS) to determine their geometrical properties, such as end-face flatness, ovality, and the draw-in of the specimens. The second part examines stress superposition. Here stress is superimposed on the specimens during cutting to trigger off an earlier failure of the investigated material. High-speed cropping with stress superposition is aimed at reducing the draw-in of the investigated samples. The results of this will be compared with the results of the first part to show the difference between high-speed cropping with and without stress superposition.

Microfabrication research at the National Submicron Facility

1983 ◽  
Vol 41 ◽  
pp. 86-89
Author(s):  
E.D. Wolf
Keyword(s):  
Integrated Circuits ◽  
Particle Physics ◽  
High Speed ◽  
New Technology ◽  
High Energy ◽  
High Energy Particle ◽  
New Science ◽  
Wide Range ◽  
Intermediate Domain ◽  
Circuit Function

Most microelectronics devices and circuits operate faster, consume less power, execute more functions and cost less per circuit function when the feature-sizes internal to the devices and circuits are made smaller. This is part of the stimulus for the Very High-Speed Integrated Circuits (VHSIC) program. There is also a need for smaller, more sensitive sensors in a wide range of disciplines that includes electrochemistry, neurophysiology and ultra-high pressure solid state research. There is often fundamental new science (and sometimes new technology) to be revealed (and used) when a basic parameter such as size is extended to new dimensions, as is evident at the two extremes of smallness and largeness, high energy particle physics and cosmology, respectively. However, there is also a very important intermediate domain of size that spans from the diameter of a small cluster of atoms up to near one micrometer which may also have just as profound effects on society as “big” physics.

Cognitive Health Counseling 40+

2013 ◽  
Vol 21 (1) ◽  
pp. 24-33 ◽  
Author(s):  
Anne Eschen ◽  
Franzisca Zehnder ◽  
Mike Martin
Keyword(s):  
Outcome Variable ◽  
Pilot Phase ◽  
Subjective Memory ◽  
Cognitive Health ◽  
Health Counseling ◽  
Agents Of Change ◽  
Main Outcome Variable ◽  
Further Development

This article introduces Cognitive Health Counseling 40+ (CH.CO40+), an individualized intervention that is conceptually based on the orchestration model of quality-of-life management ( Martin & Kliegel, 2010 ) and aims at improving satisfaction with cognitive health in adults aged 40 years and older. We describe the theoretically deduced characteristics of CH.CO40+, its target group, its multifactorial nature, its individualization, the application of subjective and objective measures, the role of participants as agents of change, and the rationale for choosing participants’ satisfaction with their cognitive health as main outcome variable. A pilot phase with 15 middle-aged and six older adults suggests that CH.CO40+ attracts, and may be particularly suitable for, subjective memory complainers. Implications of the pilot data for the further development of the intervention are discussed.

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