Ozone as an Enabler for Low Temperature Methane Control Over a Current Production Fe-BEA Catalyst

2018 ◽  
Vol 62 (1-4) ◽  
pp. 351-355 ◽  
Author(s):  
M. Keenan ◽  
J. Nicole ◽  
D. Poojary
Keyword(s):  
Low Temperature ◽  
Current Production ◽  
A Current

A Lightweight Split-Torque Transmission for a 330 KW Helicopter

1982 ◽  
Vol 196 (1) ◽  
pp. 11-22 ◽  
Author(s):  
G White
Keyword(s):  
Gear Train ◽  
Main Rotor ◽  
Speed Reduction ◽  
Torque Transmission ◽  
Current Production ◽  
Gear Trains ◽  
Fixed Axis ◽  
Three Stages ◽  
A Current ◽  
Split Torque

A simple split-torque gear train is used as the main rotor transmission of a single-engine helicopter. Overall speed reduction ratio achieved is 103:1 between the engine at a nominal 36 000 rev/min and the main rotor at 350 rev/min. This ratio is generated from three stages of fixed-axis gear trains containing only eight gears. Alternative configurations are outlined and discussed. Comparison with a current production design shows the split torque arrangement offers reductions in weight, height, and drive train losses. A low total of gears and bearings offers the potential for improved reliability.

scholarly journals Specific enrichment of hyperthermophilic electroactive Archaea from deep-sea hydrothermal vent on electrically conductive support

2018 ◽  
Author(s):  
Guillaume Pillot ◽  
Eléonore Frouin ◽  
Emilie Pasero ◽  
Anne Godfroy ◽  
Yannick Combet-Blanc ◽  
...  
Keyword(s):  
Deep Sea ◽  
Hydrothermal Vent ◽  
Black Smoker ◽  
Electrically Conductive ◽  
Microbial Electrolysis Cells ◽  
Electrolysis Cells ◽  
Direct Inoculation ◽  
Current Production ◽  
Taxonomic Affiliation ◽  
A Current

AbstractWhile more and more investigations are done to isolate hyperthermophilic exoelectrogenic communities from environments, none have been performed yet on deep-sea hydrothermal vent. Samples of black smoker chimney from Rainbow site on the Atlantic mid-oceanic ridge have been harvested for enriching exoelectrogens in microbial electrolysis cells under hyperthermophilic (80°C) condition. Two enrichments have been performed: one from direct inoculation of crushed chimney and the other one from inoculation of a pre-cultivation on iron (III) oxide. In both experiments, a current production was observed from 2.4 A/m2 to 5.8 A/m2 with a set anode potential of +0.05 vs SHE. Taxonomic affiliation of the exoelectrogen communities obtained exhibited a specific enrichment of Archaea from Thermococcales and Archeoglobales orders on the electrode, even when both inocula were dominated by Bacteria.

Microanalytical Characterization of Structure and Defects for the Development of Low Temperature Silicon Epitaxial Growth

1999 ◽  
Vol 5 (S2) ◽  
pp. 750-751
Author(s):  
K.M. Jones ◽  
J. Thiesen
Keyword(s):  
Low Temperature ◽  
Chemical Vapor ◽  
Thin Film Deposition ◽  
Film Deposition ◽  
Cross Sectional ◽  
Buried Channel ◽  
Device Processing ◽  
Current Production ◽  
New Processing ◽  
Si Epitaxy

The nano-scale dimensions of next generation VLSI and ULSI devices will drive the development of a variety of new processing requirements. Currently device processing conditions from substrate cleaning to thin film deposition require temperatures in the range of 600°C to 1200°C. In order to realize a Si device circuit architecture which integrates Si/Ge structures or the needed super abrupt junctions of buried channel CMOS, low temperature processes must replace those in current production lines. For these processes to be successfully developed and implemented, proper characterization techniques must be used. In the case of epitaxy, cross-sectional TEM is the tool of choice. We will discuss the prominent role that TEM has played in the development of a new Si epitaxy technology. Recently, at the National Renewable Energy Laboratory (NREL), we have shown low temperature, 195°C to 400°C, Si epitaxy via hot-wire chemical vapor deposition- HWCVD. In the past HWCVD has been used to produce amorphous, micro-crystalline, and polycrystalline Si thin films.

Innovative High-Temperature Aircraft Engine Fuel Nozzle Design

1993 ◽  
Vol 115 (3) ◽  
pp. 439-446 ◽  
Author(s):  
R. W. Stickles ◽  
W. J. Dodds ◽  
T. R. Koblish ◽  
J. Sager ◽  
S. Clouser
Keyword(s):  
Heat Transfer ◽  
High Temperature ◽  
Surface Finish ◽  
Thermal Protection ◽  
Aircraft Engine ◽  
Engine Fuel ◽  
Sample Tube ◽  
Current Production ◽  
Fuel Nozzle ◽  
A Current

The objective of the Innovative High-Temperature Aircraft Engine Fuel Nozzle Program was to design and evaluate a nozzle capable of operating at a combustor inlet air temperature of 1600°F (1144 K) and a fuel temperature of 350°F (450 K). The nozzle was designed to meet the same performance requirements and fit within the size envelope of a current production F404 dual orifice fuel nozzle. The design approach was to use improved thermal protection and fuel passage geometry in combination with fuel passage surface treatment to minimize coking at these extreme fuel and air temperatures. Heat transfer models of several fuel injector concepts were used to optimize the thermal protection, while a series of sample tube coking tests were run to evaluate the effect of surface finish, coatings, and tube material on the coking rate. Based on heat transfer analysis, additional air gaps, reduced fuel passage flow area, and ceramic tip components reduced local fuel wetted wall temperatures by more than 200°F (110 K) when compared to a current production F404 fuel nozzle. Sample tube coking test results showed the importance of surface finish on the fuel coking rate. Therefore, a 1 μin. (0.025 μm) roughness was specified for all fuel passage surfaces. A novel flow divider valve in the tip was also employed to reduce weight, allow room for additional thermal protection, and provide back pressure to reduce the risk of fuel vaporization. Phase II of this program will evaluate the fuel nozzle with a series of contaminated fuel and coking tests.

scholarly journals Sonic memory material as ‘pathetic trigger’

2006 ◽  
Vol 11 (1) ◽  
pp. 13-18 ◽  
Author(s):  
SALOMÉ VOEGELIN
Keyword(s):  
Visual Art ◽  
Emotional Engagement ◽  
The Past ◽  
Affective Quality ◽  
Memory Material ◽  
Sensory Motor ◽  
Current Production ◽  
Production Strategy ◽  
A Current

Memory, according to Henri Bergson, is gleaned from the present and realises the present perception from its sensory-motor elements through movements towards that which it perceives.The purpose of this article is to propose and debate the deliberate use of such ‘present memory’ in the sonic artwork. The suggestion is that sonic memory material – sounds that are plundered from old recordings – can be collaged into complex sonic works to produce, not a nostalgic experience in the sense of a recognition of the past, but a current production of sonic material in a continually present perception. Such a production strategy employs the affective quality of memory to ‘trigger’ a sensorial engagement in the sense of a ‘pathetic’ engagement understood as an emotional and sentimental involvement with the work. The understanding is that such an emotional engagement involves the listener centrally in the production of the artwork and challenges modernist (visual) art discourses, which evaluate the work from a distance.

Low-Temperature Hydrothermal Synthesis and Electrochemical Properties of Birnessit-Type Manganese Dioxide Nanosheets

2013 ◽  
Vol 800 ◽  
pp. 393-397 ◽  
Author(s):  
De Yan ◽  
Ying Liu ◽  
Zhi Guo Wu ◽  
Ren Fu Zhuo ◽  
Jun Wang
Keyword(s):  
Low Temperature ◽  
Current Density ◽  
High Current Density ◽  
Hydrothermal Process ◽  
Rate Capability ◽  
High Specific Capacitance ◽  
High Current ◽  
Cycle Stability ◽  
Good Rate Capability ◽  
A Current

Birnessite MnO2 nanosheets were synthesized by self-limiting deposition of KMnO4 in a facile low-temperature hydrothermal process. The MnO2 electrode exhibits a high specific capacitance of 169 F g-1 at a current density of 0.1 A g-1, good rate capability with a capacitance of 96 F g-1 even at a high current density of 5 A g-1, as well as excellent cycle stability with capacitance retention of 94% at 1 A g-1 after 1,000 cycles.

scholarly journals Combustion analysis of a light duty diesel engine using oxygen-enriched and humidified combustion air

2019 ◽  
Vol 116 ◽  
pp. 00061
Author(s):  
Carlo Pirola ◽  
Carlo A. Rinaldini ◽  
Federico Galli ◽  
Flavio Manenti ◽  
Massimo Milani ◽  
...  
Keyword(s):  
Diesel Engine ◽  
Thermal Efficiency ◽  
Peak Pressure ◽  
Base Case ◽  
Combustion Analysis ◽  
Turbocharged Diesel Engine ◽  
Light Duty ◽  
Current Production ◽  
Henry Constants ◽  
A Current

The present work presents the results of 3D CFD combustion simulations of a current production 4-cylinder turbocharged Diesel engine using oxygen-enriched and humidified combustion air. Enriched Air (EA) is supposed to be produced by desorption from water, exploiting the different Henry constants of N2 and O2. Simulation results show that EA permits to increase the engine thermal efficiency (up to 10%) and drastically reduces soot emissions but increases in-cylinder peak pressure and NOx emissions. Combustion air humidification helps to reduce NOx increment, without losing the advantage in terms of thermal efficiency and in soot reduction, even if NOx emissions cannot be reported to the base case values.

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