... AC, "Plume Signal Interference, Part i: Plume-Induced Noise (U ... is then used to predict plume effects on ... phase flow computation for a distribution of ...
DTIC Science & Technology
... it achieves its high stability by using four matched diodes. ... placed in a 60 Hz AC magnetic field. ... volts supplies the zero-crossing detector electronics. ...
Measurements of intrinsic conductance fluctuations often make use of a.c. modulation methods. Such methods are beneficial in reducing the contribution of amplifier noise to the final power spectrum and also in rejecting Johnson noise. The present study has two goals. First, we reexamine a.c. modulation methods when ...
NASA Astrophysics Data System (ADS)
Both compressor and turbine noise were studied in the turbomachinery noise reduction areas. A 3-stage low pressure compressor with variable-flap inlet guide vanes was tested at General Electric's outdoor test site. A hybrid inlet, which employs airflow ac...
National Technical Information Service (NTIS)
The influence of microwave phase noise on rf-induced constant voltage steps generated by the ac Josephson effect is studied. Different circuit models for the junction excitation are considered: dc and rf voltage generators, dc and rf current generators, dc current and rf voltage generators. The analysis has been carried out assuming a ...
Energy Citations Database
ac Josephson effect in one-dimensional Tomonaga-Luttinger liquid (TLL) adiabatically connected to superconducting electrodes is theoretically investigated. It is found that density fluctuations due to repulsive electron-electron interactions in TLL inhibit Josephson oscillations, whereas they do not affect time-independent current part. We also show that the fluctuations ...
The results of the work performed at EPRI's Project UHV from October 1976 to December 1977 are presented. During this period, a 3-phase ac test line with different bundles and line configurations was energized to obtain design data on audible noise, radio noise, corona loss, and television interference for ...
We study the quantum noise of the electronic current in a double-barrier system with a single resonant level. In the framework of the Landauer formalism, we treat the double barrier as a quantum coherent scattering region that can exchange photons with a coupled electric field, e.g., a laser beam or a periodic ac bias voltage. As a consequence of the ...
in the book labels are the initials of their authors: "AC" = Agatha Christie, "AP" = Alexander Pope, "EAP
E-print Network
This paper deals with a single-phase utility-interface power converter using no ac inductor to eliminate switching voltage/current ripples and electro-magnetic noises. The main circuit of the proposed converter consists of a diode-clamped linear amplifier (DCLA) and a dc-voltage balancing circuit. The DCLA has a circuit configuration ...
To improve the performance of practical active control system (ACS) for unstable combustors, the effects of system noise and ACS time delay upon combustion instabilities and the ACS performance were studied. Experimental and theoretical studies of an unco...
The left auditory cortex (AC) in humans is involved in the processing of the temporal parameters of acoustical signals, specifically in speech perception, whereas the right AC plays the dominant role in pitch and melody perception. The hemispheric lateralization of acoustical signal processing in non-human mammals is less explored. The present study ...
PubMed
... Title : Multiplicative to Additive Speckle Noise Conversion via Phase Cancellation with Photorefractive Phase Conjugators,. ...
Experiments were conducted using plasma actuators to control broadband noise generated by a bluff body flow. The motivation behind the study was to explore the potential of plasma actuators to reduce landing gear noise during approach phase of an aircraft. The control effectiveness of both dielectric barrier discharge and sliding ...
S-band Oscillator using ForeS Resonator # Ki-Woong Bae, Ho Lim, and Noh-Hoon Myung School@kaist.ac.kr 1. Introduction The modern communication systems require low cost, low phase noise local oscillators. The dielectric resonator oscillators have been widely used, but these are not compatible to monolithic microwave
... (3) In early designs, the phase noise of most DDSs was dominated by the clock oscillator phase noise, making contributions from the other ...
At high carrier margin, the local oscillator phase noise equals that of the. Block I V receiver, about 2 deg rms at Sband, whereas the digital phase noise is ...
NASA Website
This patent describes a two-phase AC power supply. It comprises AC systems; connectors; electric currents; and phase shift.
The system described provides protection for phase sensitive loads from being or remaining connected to ac power lines whenever a phase reversal occurs. It comprises a solid state phase detection circuit, a dc power relay circuit, an ac-to-dc converter fo...
An AC modulation technique is described to convert stochastic signal variations into an amplitude variation and its retrieval through Fourier analysis. It is shown that this AC detection of signals of stochastic processes when processed through auto- and cross-correlation techniques improve the signal-to-noise ratio; the correlation ...
Excess photon noise in detected photocurrent of multimode laser for uncoupled and phase locked modes
NASA Technical Reports Server (NTRS)
Modern bulk power systems require that several thousand megawatts be transmitted on single rights-of-way. The historic approach to accomplishing this level of synchronous transfer has been extra-high-voltage AC, i.e., voltages greater than 230 kV and less than 1000 kV. While extra-high-voltage 3-phase AC has proven to be both efficient ...
A stochastic signal model is used to study the phase noise suppression in an ideal mixer circuit. The phase noise in a harmonic oscillator is modeled by a sinewave containing a random phase term. The random phase term is a random walk stochastic process. ...
... Induction (AC) Modes of Operation ... Page 4. Compact, Low-Noise Magnetic Sensor with Fluxgate and Induction modes of Operation i. ...
... Accession Number : ADD015994. Title : System for Cancelling Phase Noise in an Interferometric Fiber Optic Sensor Arrangement. ...
... Title : NOVEL PASSIVE PHASE NOISE CANCELLING TECHNIQUE FOR INTERFEROMETRIC FIBRE OPTIC SENSORS. Corporate Author : ...
... of these systems in conjunction with the vibration sensitivity of the SAW resonators leads to a degradation in oscillator phase noise, which may then ...
... AC-13OA IN-FLIGHT CREW NOISE ... AC-130A, Rickenbacker AFB, 18 Sep 1968, Serial #54-1623/ Eglin AFB, 23 Sep 1968, Serial #54-1625 ...
We present the experimental observation of the fluctuation-dissipation theorem violation in an assembly of interacting magnetic nanoparticles in the low temperature superspin-glass phase. The magnetic noise is measured with a two-dimension electron gas Hall probe and compared to the out of phase ac susceptibility ...
... Title : Active Noise Cancellation Stethoscope. ... Stethoscope, Active Noise Cancellation, Medevac, Noise, Auscultation Device, SBIR, Phase I, RAD II. ...
This property can be used to establish the existence of an optimum loop bandwidth. C. Oscillator Phase Noise. Oscillator phase noise can be modeled as [3] ...
... Accession Number : ADA081426. Title : FAA Integrated Noise Model Validation. Phase 1. Analysis of Integrated Noise Model ...
This investigation proposes a novel all-optical phase noise averager to reduce residual phase noise in the differential phase-shift keying (DPSK) transmission system with phase-preserving amplitude regenerators. The proposed phase ...
... Approved for public release; distribution is unlimited A THREE-PHASE HYBRID DC-AC INVERTER SYSTEM UTILIZING HYSTERESIS CONTROL ...
Discussions are presented of the three phases of the noise reduction program on flight-type coal conveyors. The three phases are identification of noise sources, evaluation of potential noise reduction concepts, and implementation of noise reduction, whic...
In this dissertation, two major accomplishments are achieved. First, the feasibility of a proposed Wyoming to California HVDC system having the ratings of 1000 MW, �500 kV, 2 kA, 860 miles and 12-pulse bipolar lines is shown for exporting Wyoming's electrical power resources to the heavy loaded western states. The second and the main objective of this dissertation is the development of a Kalman ...
The photon-assisted shot noise through a quantum dot in the Kondo regime is investigated by applying time-dependent canonical transformation and non-crossing approximation technique. A basic formula for the photon-assisted shot noise is obtained. The rich dependence of the shot noise on the external ac field and ...
Morrison's iterative method of noise removal can be applied for both noise removal alone and noise removal prior to deconvolution. This method is applied to noise of various noise levels added to determine the optimum use of the method. The phase shift me...
Measurements have been made of the phase noise of a single-mode diode laser in an unbalanced Michelson interferometer, as a function of optical path difference. The noise increased linearly with increasing optical path difference. The origin of the phase noise is discussed.
Oscillator phase noise is thus determined by a com- bination of mixer noise ... Q = 20000), this would allow an oscillator phase noise of lose = -43 dB/f3 per Hz, ...
As laser light propagates through a resonant vapor, laser phase noise (PM) is converted to laser intensity noise (AM) because of the sensitivity of atomic coherence to laser phase fluctuations. In experiments reported here, it is shown that this PM-to-AM ...
Step-scan double-modulation (phase and electrochemical potential) Fourier transform infrared (FT-IR) spectrometry provides both spectroscopic and dynamic information about faradaic reactions. Recently introduced digital signal processing (DSP) can be used, instead of two lock-in amplifiers, for the optical signal demodulation at two modulation frequencies. In order to ...
This is a task report of effort directed toward the identification of the most severe sources of industrial machinery noise from an occupational perspective, and to develop information on trade associations which would be concerned with noise research. Ac...
Measurements of the HF radio noise environment near an HVDC transmission line and converter station were made outside Winnipeg in July 1977. Typical levels and characteristics are presented for various combinations of mercury arc valve noise, ac hum and d...
The noise generated by supersonic tip speed propellers may be a cabin environment problem for future propeller-driven airplanes. Active suppression from speakers inside the airplane cabin has been proposed for canceling out this noise. The potential of ac...
