scholarly journals Design of New-type Impactor Based on Combined Effect by Air-pressure and Electromagnetism

CONVERTER ◽  
2021 ◽  
pp. 262-267
Author(s):  
Weizhang Wang, Zengmei Song, Lin Shi
Keyword(s):  
Wave Theory ◽  
High Energy ◽  
Air Pressure ◽  
Combined Effect ◽  
Air Hammer ◽  
Energy Impact ◽  
Breaking Mechanism ◽  
Rapid Destruction ◽  
New Type ◽  
Variable Impact

Analysis ofrock-breaking mechanism of cyclical impact loading under high and low impact on the basis of impact stress wave theory holds that microcrack occurs in the rock due to high energy impact and the following medium and low impact can cause rapid destruction of the rock. Intermittent impact method of variable impact energy is hence suggested. Electromagnetically-propelled device is added to the traditional air hammer by means of intermittent intervention by electromagnetic impact.Combined impact by gas and power and interval pneumatic impact is applied to design new-type impactor based on the combined effect by air-pressure and electromagnetism, which is supposed to provide a new solution for improvement of impactor work efficiency.

Mullite Diffusion Barriers for SiC-C/C Composites Produced by Pulsed Laser Deposition

1998 ◽  
Vol 555 ◽  
Author(s):  
H. Fritze ◽  
A. Schnittker ◽  
T. Witke ◽  
C. Rüscher ◽  
S. Weber ◽  
...  
Keyword(s):  
Pulsed Laser Deposition ◽  
Pulsed Laser ◽  
Target Material ◽  
High Energy ◽  
Single Step ◽  
Laser Deposition ◽  
Reduced Pressure ◽  
Oxidation Rates ◽  
Energy Impact ◽  
Diffusion Parameters

AbstractPulsed Laser Deposition (PLD) allows the ablation of nonconductive and high melting point target materials and the preparation of films with complex composition. High energy impact leads to melting and evaporation of the target material in a single step. In case of mullite ablation, the flux of the metal components is stoichiometric. Under reduced pressure the oxygen content in the layers decreases. However, after a short oxidation treatment, the formation of mullite in the coating is completed, as confirmed by IR spectroscopy and XRD investigations. For a commercial Si-SiC precoated C/C material, the effectiveness of additional PLD mullite layers as outer oxidation protection is tested in the temperature range 773 K < T < 1873 K. Mullite coatings with a thickness of 2.5 pm improve the oxidation behaviour significantly. Because of SiO2 formation at the mullite-SiC interface, all samples exhibited a mass increase upon oxidation. For oxidation durations of three days, only amorphous SiO2 is formed at the mullite-SiC interface. The inward diffusion of oxygen across the outer mullite-containing layer controls the kinetics of the reaction, as was deduced from 18O diffusivity measurements in PLD mullite layers. At temperatures close to the eutectic temperature (1860 K), mullite can seal defects. The calculated oxidation rates resulting from the diffusion parameters in SiO2 and mullite are close to the thermogravimetric data.

High energy impact techniques application for surface grain refinement in AZ91D magnesium alloy

2008 ◽  
Vol 43 (13) ◽  
pp. 4658-4665 ◽  
Author(s):  
Li-feng Hou ◽  
Ying-hui Wei ◽  
Bao-sheng Liu ◽  
Bing-she Xu
Keyword(s):  
Magnesium Alloy ◽  
Grain Refinement ◽  
High Energy ◽  
Az91d Magnesium Alloy ◽  
Energy Impact

scholarly journals A new type of transient high-energy source in the direction of the Galactic Centre

Nature ◽  
1996 ◽  
Vol 379 (6568) ◽  
pp. 799-801 ◽  
Author(s):  
C. Kouveliotou ◽  
J. van Paradijs ◽  
G. J. Fishman ◽  
M. S. Briggs ◽  
J. Kommers ◽  
...  
Keyword(s):  
Energy Source ◽  
High Energy ◽  
Galactic Centre ◽  
New Type

scholarly journals Physics and Modeling of Various Hazardous Landslides

Geosciences ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 108
Author(s):  
Jόnas Elíasson ◽  
Þorsteinn Sæmundsson
Keyword(s):  
Turbulent Flows ◽  
High Velocity ◽  
Wave Theory ◽  
Type I ◽  
Flow Paths ◽  
Stable Slope ◽  
Slope Factor ◽  
New Type ◽  
Flowing Material ◽  
Type Studies

In 2014, the Varnes classification system for landslides was updated. Complex landslides can still be a problem to classify as the classification does not include the flow type in the hydrodynamical sense. Three examples of Icelandic landslides are presented and later used as case studies in order to demonstrate the methods suggested to analyze the flow. The methods are based on the different physical properties of the flow types of the slides. Three different flow types are presented, named type (i), (ii), and (iii). Types (i) and (ii) do not include turbulent flows and their flow paths are sometimes independent of the velocity. Type (iii) include high velocity flows; they are treated with the translator wave theory, where a new type of a slope factor is used. It allows the slide to stop when the slope has flattened out to the value that corresponds to the stable slope property of the flowing material. The type studies are for a fast slide of this type, also a large slip circle slide that turns into a fast-flowing slide farther down the path and finally a large slide running so fast that it can run for a kilometer on flat land where it stops with a steep front.

Treatment of Peaty Clay by High Energy Impact

1979 ◽  
Vol 105 (8) ◽  
pp. 957-967
Author(s):  
Salem D. Ramaswamy ◽  
Seng-Lip Lee ◽  
M.H. Abdul Khader ◽  
Raja V. Subrahmanyam ◽  
Mohamed A. Aziz
Keyword(s):  
High Energy ◽  
Energy Impact

Analysis of High Energy Impact of a Raindrop on Water

2020 ◽  
pp. 907-922
Author(s):  
Mohamed Houssein Ghandour ◽  
Annie-Claude Bayeul-Lainé ◽  
Olivier Coutier-Delgosha
Keyword(s):  
High Energy ◽  
Energy Impact
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