Systematic investigation of the alpha parameter influence on the critical feedback level in QD lasers

2009 ◽  
Author(s):  
F. Grillot ◽  
N. A. Naderi ◽  
M. Pochet ◽  
C.-Y. Lin ◽  
L. F. Lester
Keyword(s):  
Systematic Investigation ◽  
Critical Feedback ◽  
Feedback Level ◽  
Parameter Influence

scholarly journals The Critical Feedback Level in Nanostructure - Based Semiconductor Lasers

10.5772/8559 ◽  
2010 ◽  
Author(s):  
F. Grillot ◽  
N. A. ◽  
M. Pochet ◽  
C.-Y. Lin ◽  
L. F.
Keyword(s):  
Semiconductor Lasers ◽  
Critical Feedback ◽  
Feedback Level

scholarly journals Tuning of the critical feedback level in 1.55-μm quantum dash semiconductor laser diodes

2009 ◽  
Vol 3 (6) ◽  
pp. 242-247 ◽  
Author(s):  
F. Grillot ◽  
L.F. Lester ◽  
M. Pochet ◽  
N.A. Naderi ◽  
P. Besnard ◽  
...  
Keyword(s):  
Semiconductor Laser ◽  
Laser Diodes ◽  
Quantum Dash ◽  
Critical Feedback ◽  
Semiconductor Laser Diodes ◽  
Feedback Level

Grain Refinement in Titanium-Erbium Alloys

1974 ◽  
Vol 32 ◽  
pp. 522-523
Author(s):  
B. B. Rath ◽  
J. E. O'Neal ◽  
R. J. Lederich
Keyword(s):  
Electron Microscopy ◽  
Size Distribution ◽  
Grain Refinement ◽  
Grain Growth ◽  
Volume Fraction ◽  
Pure Titanium ◽  
Systematic Investigation ◽  
Second Phase ◽  
Titanium Matrix ◽  
Average Size

Addition of small amounts of erbium has a profound effect on recrystallization and grain growth in titanium. Erbium, because of its negligible solubility in titanium, precipitates in the titanium matrix as a finely dispersed second phase. The presence of this phase, depending on its average size, distribution, and volume fraction in titanium, strongly inhibits the migration of grain boundaries during recrystallization and grain growth, and thus produces ultimate grains of sub-micrometer dimensions. A systematic investigation has been conducted to study the isothermal grain growth in electrolytically pure titanium and titanium-erbium alloys (Er concentration ranging from 0-0.3 at.%) over the temperature range of 450 to 850°C by electron microscopy.

Optical Properties of HVEM Accelerators

1975 ◽  
Vol 33 ◽  
pp. 180-181
Author(s):  
A. Strojnik ◽  
J.W. Scholl ◽  
V. Bevc
Keyword(s):  
Optical Properties ◽  
Electron Accelerator ◽  
Systematic Investigation ◽  
Electron Source ◽  
High Brightness ◽  
The Past ◽  
Wide Range ◽  
Optical Behavior

The electron accelerator, as inserted between the electron source (injector) and the imaging column of the HVEM, is usually a strong lens and should be optimized in order to ensure high brightness over a wide range of accelerating voltages and illuminating conditions. This is especially true in the case of the STEM where the brightness directly determines the highest resolution attainable. In the past, the optical behavior of accelerators was usually determined for a particular configuration. During the development of the accelerator for the Arizona 1 MEV STEM, systematic investigation was made of the major optical properties for a variety of electrode configurations, number of stages N, accelerating voltages, 1 and 10 MEV, and a range of injection voltages ϕ0 = 1, 3, 10, 30, 100, 300 kV).

Magnitude Estimation and Cross-Modal Matching of Lingual Vibrotactile and Auditory Sensation

1989 ◽  
Vol 32 (3) ◽  
pp. 698-702 ◽  
Author(s):  
Daniel Harris ◽  
Donald Fucci ◽  
Linda Petrosino
Keyword(s):  
Auditory Stimulus ◽  
Magnitude Estimation ◽  
Sensory Processing ◽  
Test Site ◽  
Systematic Investigation ◽  
Thenar Eminence ◽  
Stimulus Range ◽  
Psychophysical Scaling ◽  
Scaling Methods ◽  
Response Biases

The present experiment was a preliminary attempt to use the psychophysical scaling methods of magnitude estimation and cross-modal matching to investigate suprathreshold judgments of lingual vibrotactile and auditory sensation magnitudes for 20 normal young adult subjects. A 250-Hz lingual vibrotactile stimulus and a 1000-Hz binaural auditory stimulus were employed. To obtain judgments for nonoral vibrotactile sensory magnitudes, the thenar eminence of the hand was also employed as a test site for 5 additional subjects. Eight stimulus intensities were presented during all experimental tasks. The results showed that the slopes of the log-log vibrotactile magnitude estimation functions decreased at higher stimulus intensity levels for both test sites. Auditory magnitude estimation functions were relatively constant throughout the stimulus range. Cross-modal matching functions for the two stimuli generally agreed with functions predicted from the magnitude estimation data, except when subjects adjusted vibration on the tongue to match auditory stimulus intensities. The results suggested that the methods of magnitude estimation and cross-modal matching may be useful for studying sensory processing in the speech production system. However, systematic investigation of response biases associated with vibrotactile-auditory psychophysical scaling tasks appears to be a prerequisite.

Effects of Postgastric 13C-Acetate Processing on 13CO2-Exhalation in Health–A Systematic Investigation

2005 ◽  
Vol 43 (05) ◽  
Author(s):  
O Goetze ◽  
H Fruehauf ◽  
MA Kwiatek ◽  
M Thumshirn ◽  
W Schwizer ◽  
...  
Keyword(s):  
Systematic Investigation
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