Effect of frequency on the relationship between intensity discrimination and the detection of amplitude modulation

2005 ◽  
Vol 117 (4) ◽  
pp. 2534-2535
Author(s):  
Rebecca E. Millman ◽  
Sid P. Bacon
Keyword(s):  
Amplitude Modulation ◽  
Intensity Discrimination ◽  
The Relationship

Intensity discrimination and detection of amplitude modulation

1999 ◽  
Vol 106 (4) ◽  
pp. 1917-1924 ◽  
Author(s):  
Magdalena Wojtczak ◽  
Neal F. Viemeister
Keyword(s):  
Amplitude Modulation ◽  
Intensity Discrimination

EPSP Amplitude Modulation at the Rat Ia-Alpha Motoneuron Synapse: Effects of GABAB Receptor Agonists and Antagonists

1998 ◽  
Vol 79 (1) ◽  
pp. 181-189 ◽  
Author(s):  
Kavita R. Peshori ◽  
William F. Collins ◽  
Lorne M. Mendell
Keyword(s):  
Amplitude Modulation ◽  
High Frequency ◽  
Low Frequency ◽  
High Frequency Stimulation ◽  
Posttetanic Potentiation ◽  
Epsp Amplitude ◽  
Frequency Stimulation ◽  
The Relationship ◽  
Receptor Agonists And Antagonists ◽  
Cgp 35348

Peshori, Kavita R., William F. Collins III, and Lorne M. Mendell. EPSP amplitude modulation at the rat Ia-alpha motoneuron synapse: effects of GABAB receptor agonists and antagonists. J. Neurophysiol. 79: 181–189, 1998. The object of this study was to examine the relationship between excitatory postsynaptic potential (EPSP) amplitude, posttetanic potentiation, and EPSP amplitude modulation at synapses made by group Ia afferents on motoneurons in the rat. These relationships were evaluated in cells in untreated rats and in cells in rats treated with the γ-aminobutyric acid-B (GABAB) receptor agonist baclofen and antagonist CGP-35348, which were used to manipulate Ca2+ entry into presynaptic terminals and consequently probability of transmitter release from them. There was no evidence for postsynaptic action of these drugs from measurement of their effects on motoneuron properties. During high-frequency stimulation (32 shock bursts at 167 Hz), EPSP amplitude either decreased (negative modulation) or increased (positive modulation) in response to successive stimuli at different connections. In untreated rats this frequency-dependent amplitude modulation behavior was inversely but weakly correlated with EPSP amplitude measured at low frequency. Intravenous (iv) administration of the GABAB agonist, baclofen, produced a marked and progressive decrease in EPSP amplitude measured at low frequency coincident with a change in frequency-dependent EPSP amplitude modulation toward more positive values (synaptic facilitation). In contrast, an increase in EPSP amplitude occurred after iv administration of the GABAB antagonist CGP-35348 that was accompanied by a negative shift in EPSP amplitude modulation during high-frequency stimulation. The negative shift in EPSP amplitude modulation (synaptic depression) after CGP-35348 application was much smaller than the positive shift induced by baclofen when normalized to the change in EPSP amplitude. Posttetanic potentiation decreased after baclofen but did not increase after CGP-35348. The relationship between modulation and EPSP amplitude was much steeper after GABAB receptor manipulation in either direction than that observed in the population of motoneurons in untreated preparations. This suggests that in the rat differences in probability of release play at most a small role in determining EPSP amplitude across the motoneuron pool.

The Current Eigenfrequencies for Bearing Fault of Mixed Eccentric Motor Based on Amplitude Modulation

2014 ◽  
Vol 668-669 ◽  
pp. 273-276 ◽  
Author(s):  
Jing He Ma ◽  
Chi Dong Qiu ◽  
Jia Jia Luo ◽  
Guo Zhu Cheng
Keyword(s):  
Magnetic Permeability ◽  
Amplitude Modulation ◽  
Air Gap ◽  
Periodic Change ◽  
Simulation Studies ◽  
Bearing Fault ◽  
The Relationship ◽  
Current Feature

The current feature for motor carried with natural mixed eccentric and bearing fault is merely focused even though it is very important for motor online diagnosis. Based on the amplitude modulation, this theme researched on periodic change of the air-gap length caused by not only bearing fault but also mixed eccentric. Based on the relationship between the motor inductance and the magnetic permeability, the inductance expression was deduced for motor with bearing fault, motor with mixed eccentric and motor with not only bearing fault but also mixed eccentric. A new current eigenfrequencies expression was introduced by employing proposed inductance expression. Finally, a series of simulation studies were conducted, the results show that the new current eigenfrequencies expression is valid and useful for online diagnosis of those motor in service.

Interstellar gas in the central region of the Galaxy

1967 ◽  
Vol 31 ◽  
pp. 239-251 ◽  
Author(s):  
F. J. Kerr
Keyword(s):  
Central Region ◽  
Galactic Plane ◽  
Neutral Hydrogen ◽  
Continuum Emission ◽  
Galactic Centre ◽  
Interstellar Gas ◽  
Hydrogen Recombination ◽  
The Galaxy ◽  
Centre Region ◽  
The Relationship

A review is given of information on the galactic-centre region obtained from recent observations of the 21-cm line from neutral hydrogen, the 18-cm group of OH lines, a hydrogen recombination line at 6 cm wavelength, and the continuum emission from ionized hydrogen.Both inward and outward motions are important in this region, in addition to rotation. Several types of observation indicate the presence of material in features inclined to the galactic plane. The relationship between the H and OH concentrations is not yet clear, but a rough picture of the central region can be proposed.

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