Selection of transverse oscillation modes in tilted ridge DFB lasers

1996 ◽  
Vol 14 (8) ◽  
pp. 1853-1858 ◽  
Author(s):  
A.M. Sarangan ◽  
W.-P. Huang ◽  
G.P. Li ◽  
T. Makino
Keyword(s):  
Transverse Oscillation ◽  
Oscillation Modes ◽  
Selection Of

Power System Oscillation Modes Identifications: Guidelines for Applying TLS-ESPRIT Method

2013 ◽  
Vol 14 (1) ◽  
pp. 57-66 ◽  
Author(s):  
Gopal R. Gajjar ◽  
Shreevardhan Soman
Keyword(s):  
Power System ◽  
Oscillation Mode ◽  
Area Measurement ◽  
Wide Area ◽  
Mode Identification ◽  
Measurement Systems ◽  
Electromechanical Oscillations ◽  
Direct Observations ◽  
Oscillation Modes ◽  
Selection Of

Abstract Fast measurements of power system quantities available through wide-area measurement systems enables direct observations for power system electromechanical oscillations. But the raw observations data need to be processed to obtain the quantitative measures required to make any inference regarding the power system state. A detailed discussion is presented for the theory behind the general problem of oscillatory mode indentification. This paper presents some results on oscillation mode identification applied to a wide-area frequency measurements system. Guidelines for selection of parametes for obtaining most reliable results from the applied method are provided. Finally, some results on real measurements are presented with our inference on them.

RESEARCH TO IMPROVE POWERTRAIN NOISE, VIBRATION AND HARSHNESS CHARACTERISTICS

Akustika ◽  
2021 ◽  
pp. 119-132
Author(s):  
Rakhmatdzon Rakhmatov ◽  
Vitaliy Krutolapov ◽  
Vladimir Galevko ◽  
Sergey Gaslov ◽  
Aleksandr Bokarev ◽  
...  
Keyword(s):  
Experimental Research ◽  
Natural Frequencies ◽  
Experimental Methodology ◽  
Structural Noise ◽  
Resonant Frequencies ◽  
Operating Modes ◽  
Design Changes ◽  
Target Values ◽  
Oscillation Modes ◽  
Selection Of

The paper presents a research algorithm consisting of: a developed methodology for selection of target values for natural frequencies and localization of vibration-loaded area of the powertrain based on calculation (simulation) and experimental research of resonant frequencies of the powertrain in operating modes and disturbances from two types of roads, calculation and experimental methodology for research of natural frequencies and oscillation modes of the powertrain, developed methodology for powertrain design refinement in terms of natural frequencies up to compliance with the target values and reduction of structural noise. Results of calculation and experimental research of resonant frequencies of the powertrain in operating modes and in case of disturbance from two types of roads are provided. There is also a justification given for selection of the target value for the powertrain natural frequency. Calculation of powertrain natural frequencies and oscillation modes was performed using the finite element method; experimental verification of the calculation was carried out as well. Using the verified calculation (simulation) model, design changes were introduced to reach the target values for natural frequencies and to reduce structural noise. Comparative calculation studies of the frequency response confirming the efficiency of the design changes are carried out.

Selection of oscillation modes of a gas laser by means of a magnetic field

1975 ◽  
Vol 22 (5) ◽  
pp. 610-612
Author(s):  
A. P. Voitovich ◽  
V. V. Dubinin ◽  
A. Ya. Smirnov
Keyword(s):  
Magnetic Field ◽  
Gas Laser ◽  
Oscillation Modes ◽  
Selection Of

Cognitive gadgets and cognitive priors

2019 ◽  
Vol 42 ◽  
Author(s):  
Gian Domenico Iannetti ◽  
Giorgio Vallortigara
Keyword(s):  
Cognitive Neuroscience ◽  
Selection Of

Abstract Some of the foundations of Heyes’ radical reasoning seem to be based on a fractional selection of available evidence. Using an ethological perspective, we argue against Heyes’ rapid dismissal of innate cognitive instincts. Heyes’ use of fMRI studies of literacy to claim that culture assembles pieces of mental technology seems an example of incorrect reverse inferences and overlap theories pervasive in cognitive neuroscience.

Note on Selection of Coordinate Systems for Geodynamics

1975 ◽  
Vol 26 ◽  
pp. 395-407
Author(s):  
S. Henriksen
Keyword(s):  
Sea Level ◽  
The Other ◽  
Coordinate Systems ◽  
Mean Sea Level ◽  
The Earth ◽  
The One ◽  
Static Systems ◽  
Selection Of

The first question to be answered, in seeking coordinate systems for geodynamics, is: what is geodynamics? The answer is, of course, that geodynamics is that part of geophysics which is concerned with movements of the Earth, as opposed to geostatics which is the physics of the stationary Earth. But as far as we know, there is no stationary Earth – epur sic monere. So geodynamics is actually coextensive with geophysics, and coordinate systems suitable for the one should be suitable for the other. At the present time, there are not many coordinate systems, if any, that can be identified with a static Earth. Certainly the only coordinate of aeronomic (atmospheric) interest is the height, and this is usually either as geodynamic height or as pressure. In oceanology, the most important coordinate is depth, and this, like heights in the atmosphere, is expressed as metric depth from mean sea level, as geodynamic depth, or as pressure. Only for the earth do we find “static” systems in use, ana even here there is real question as to whether the systems are dynamic or static. So it would seem that our answer to the question, of what kind, of coordinate systems are we seeking, must be that we are looking for the same systems as are used in geophysics, and these systems are dynamic in nature already – that is, their definition involvestime.

Measurements of the Cape Astrometric Survey of the Southern Hemisphere

1978 ◽  
Vol 48 ◽  
pp. 515-521
Author(s):  
W. Nicholson
Keyword(s):  
Southern Hemisphere ◽  
Automatic Measuring ◽  
Measuring Machine ◽  
Final Selection ◽  
Selection Of

SummaryA routine has been developed for the processing of the 5820 plates of the survey. The plates are measured on the automatic measuring machine, GALAXY, and the measures are subsequently processed by computer, to edit and then refer them to the SAO catalogue. A start has been made on measuring the plates, but the final selection of stars to be made is still a matter for discussion.

Application of Improved Voltage Compensation in the SEM to Imaging of Organic Materials

1973 ◽  
Vol 31 ◽  
pp. 444-445
Author(s):  
P.J. Killingworth ◽  
M. Warren
Keyword(s):  
Electron Beam ◽  
Organic Materials ◽  
Operating Parameters ◽  
Low Density ◽  
Beam Diameter ◽  
Incident Electron Beam ◽  
Specimen Material ◽  
Voltage Compensation ◽  
Selection Of ◽  
Scanning Electron

Ultimate resolution in the scanning electron microscope is determined not only by the diameter of the incident electron beam, but by interaction of that beam with the specimen material. Generally, while minimum beam diameter diminishes with increasing voltage, due to the reduced effect of aberration component and magnetic interference, the excited volume within the sample increases with electron energy. Thus, for any given material and imaging signal, there is an optimum volt age to achieve best resolution.In the case of organic materials, which are in general of low density and electric ally non-conducting; and may in addition be susceptible to radiation and heat damage, the selection of correct operating parameters is extremely critical and is achiev ed by interative adjustment.

Selection and Preparation of Specific Tissue Regions For Tem Using Large Epoxy-Embedded Blocks

1973 ◽  
Vol 31 ◽  
pp. 324-325 ◽  
Author(s):  
P. M. Lowrie ◽  
W. S. Tyler
Keyword(s):  
Electron Microscopy ◽  
Anatomical Structures ◽  
Ultrastructural Studies ◽  
Transmission Electron ◽  
Microscopic Evaluation ◽  
Embedded Blocks ◽  
Specific Tissue ◽  
Definition Of ◽  
Areas Of Interest ◽  
Selection Of

The importance of examining stained 1 to 2μ plastic sections by light microscopy has long been recognized, both for increased definition of many histologic features and for selection of specimen samples to be used in ultrastructural studies. Selection of specimens with specific orien ation relative to anatomical structures becomes of critical importance in ultrastructural investigations of organs such as the lung. The uantity of blocks necessary to locate special areas of interest by random sampling is large, however, and the method is lacking in precision. Several methods have been described for selection of specific areas for electron microscopy using light microscopic evaluation of paraffin, epoxy-infiltrated, or epoxy-embedded large blocks from which thick sections were cut. Selected areas from these thick sections were subsequently removed and re-embedded or attached to blank precasted blocks and resectioned for transmission electron microscopy (TEM).

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