Design of high‐intensity, high‐efficiency sirens for acoustic agglomeration

1986 ◽  
Vol 79 (S1) ◽  
pp. S90-S90
Author(s):  
F. G. Pla ◽  
G. Reethof
Keyword(s):  
High Intensity ◽  
High Efficiency

Analysis of the Dynamic Pressure Characteristics for Rock Fracturation under High Intensity Mining

2013 ◽  
Vol 734-737 ◽  
pp. 714-721
Author(s):  
Qing Feng Li ◽  
Chuan Qu Zhu
Keyword(s):  
High Intensity ◽  
High Efficiency ◽  
Dynamic Pressure ◽  
Great Influence ◽  
Vertical Stress ◽  
Rock Masses ◽  
Dynamic Disturbance ◽  
Working Face ◽  
Coal Rock ◽  
Mining Coal

With the increase of mining intensity, mining causes significant dynamic disturbance and dynamic disasters, which have exerted a great influence on the safety and high-efficiency of production. This article based on the study of the displacement tendency of the rock masses on or under fractured face of the key layer, deduces the vertical stress calculation formula of the rock mass under the fractured face which indicates that the vertical stress is correlative with the length of fault block in key layer, the depth of key layer, the distance between key layer and mining coal seam, the equivalent elastic modulus of coal stratum underlying the key layer and so on; And then by numerical simulation, it studies the dynamic disturbance effect on front coal-rock masses as the key layer fractures which shows that dynamic disturbance effect caused by high intensity mining is relatively conspicuous on the fractured stratum (the key layer), the stratum under the fractured one and the stratum in the advancing direction of working face; As for the stratum on the fractured one (the key layer),the dynamic disturbance effect becomes less conspicuous as they grow farther away from the fractured one.

scholarly journals Phase transformation under beam-target interactions during high-intensity pulsed ion beam irradiation at low pressure

2011 ◽  
Vol 29 (3) ◽  
pp. 283-289 ◽  
Author(s):  
X.P. Zhu ◽  
F.G. Zhang ◽  
Y. Tang ◽  
M.K. Lei
Keyword(s):  
Phase Transformation ◽  
High Intensity ◽  
High Efficiency ◽  
Ion Beam ◽  
Low Pressure ◽  
Ion Source ◽  
Source Material ◽  
Gaseous Species ◽  
Titanium Target ◽  
Ion Species

AbstractNitrides and/or carbonitrides formation of high efficiency was found on titanium target under irradiation of high-intensity pulsed ion beam (HIPIB) with a few shots at a low pressure of 10−2 Pa order, which is extraordinary in comparison with conventional thermo-chemical diffusion process such as gas nitriding and/or carbonitriding of metals necessarily heated at high temperatures during a processing time of hours. The underlying mechanism of the nitrides and carbonitrides formation on titanium targets was explored by a comparative study on three typical HIPIB sources, i.e., TEMP-6, TEMP-4M, and ETIGO-II, varying the irradiation intensity within several J/cm2 per shot of a 60–70 ns pulse duration and the shot number of similar ion species. It is revealed that ambient gases and ion source material are the main sources providing the nitrogen and carbon species for the phase transformation on titanium target at the low pressures, whereas the ion species of HIPIB composition is negligible at a low implantation dose of 1013–1014 ions/cm2. The adsorbed gaseous species, the deposited layer of the ion source material, and in-situ formed compound top layer from reactions between ablation plasma and the ambient species during HIPIB irradiation, can be effectively incorporated into the irradiated target surfaces under a controlled HIPIB-target interaction.

The Flame Structure of High Intensity Multi-Jet Shear Layer Enclosed Turbulent Diffusion Flames

1992 ◽  
Author(s):  
G. E. Andrews ◽  
A. F. Ali Al-Shaikhly
Keyword(s):  
Shear Layer ◽  
High Velocity ◽  
High Intensity ◽  
High Efficiency ◽  
Shear Layers ◽  
Operating Conditions ◽  
Fuel Injector ◽  
Propane Combustion ◽  
Wide Range ◽  
Air Mixing

Fuel injection into high velocity jet shear layers in an enclosed 140mm diameter conical flame stabiliser, with four large jet shear layers and a central radial fuel injector, was studied at operating conditions relevant to high intensity burners and gas turbine primary zones. The mean exhaust emissions for propane were shown exhibit a high efficiency over a wide range of equivalence ratios with a good turn down ratio. Fuel and air mixing, propane combustion development and NOx formation was investigated using internal gas composition measurements at three simulated lean primary zone operating conditions. The combustion development and emissions was shown to be dominated by fuel and air mixing between a rich outer recirculation zone and a high velocity lean inner shear layer outflow region. An aerodynamically generated rich lean combustion system was generated without fuel or air staging, but the interface mixing region resulted in significant NOx generation.

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