Integral transfer of radiation of the actual spectrum in problems of radiative plasmadynamics

1999 ◽  
Vol 72 (6) ◽  
pp. 1065-1074
Author(s):  
K. L. Stepanov ◽  
L. N. Panasenko ◽  
G. S. Romanov ◽  
Yu. A. Stankevich ◽  
L. K. Stanchits
Keyword(s):  
Actual Spectrum

A Critical Look at the Use of Design Spectrum Shape for Seismic Risk Assessment

2012 ◽  
Vol 28 (4) ◽  
pp. 1711-1721
Author(s):  
Emrah Erduran ◽  
Conrad Lindholm
Keyword(s):  
Numerical Simulations ◽  
Response Spectra ◽  
Ground Motion Prediction Equations ◽  
Ground Motion Prediction ◽  
Design Spectrum ◽  
Spectrum Shape ◽  
Actual Spectrum ◽  
Building Typology ◽  
Actual Response ◽  
Damage Estimates

The effects of using design spectrum shape over actual response spectra on earthquake damage estimates has been investigated. A series of numerical simulations were conducted to estimate the expected damage. The simulations were conducted with four different spectral shapes, two different ground-motion prediction equations (GMPEs) and three different soil classes. As a result of the numerical simulations, it was observed that the use of design spectrum shape leads to over- or underestimation of damage estimates relative to those obtained from the actual spectrum computed using GMPE. The damage estimates were observed to be sensitive to the selected design spectrum shape, the GMPE used to compute the spectral values, the soil type, and the fundamental period of the building typology. It was also observed that Eurocode- and IBC-type design spectrum shapes led to significantly different damage estimates compared to one another.

A consideration of the effect of ear canal resonance and hearing loss upon white noise generators for tinnitus retraining therapy

1997 ◽  
Vol 111 (9) ◽  
pp. 810-813 ◽  
Author(s):  
David M. Baguley ◽  
Graham J. Beynon ◽  
Frances Thornton
Keyword(s):  
Hearing Loss ◽  
White Noise ◽  
Noise Generator ◽  
Major Advance ◽  
Ear Canal ◽  
Tinnitus Retraining Therapy ◽  
Hearing Sensitivity ◽  
Actual Spectrum ◽  
Retraining Therapy ◽  
White Noise Generator

AbstractTinnitus retraining therapy has been heralded as a major advance in the alleviation of tinnitus perception. A cornerstone of this technique is to use white noise produced by a white noise generator (WNG) over a period of several months in order to assist the patient to habituate to their tinnitus. There are three factors which influence the frequency spectrum of the perceived noise such that the perception of white noise from a WNG is unlikely. These factors are the actual spectrum of the emitted noise, the ear canal resonance of the patient and the hearing sensitivity of the patient.Advocates of tinnitus retraining therapy state that white noise is the optimal stimulation to assist habituation of tinnitus. This paper demonstrates that this optimal situation is unlikely to be achieved and that this may account for the long periods needed for patients to achieve benefit from the technique. The development of devices that allow for the above factors to be countered is suggested.

scholarly journals The statistical form of the curve of oscillation for the radiation emitted by a black body

1909 ◽  
Vol 82 (553) ◽  
pp. 177-181
Keyword(s):  
Short Interval ◽  
Black Body ◽  
General Character ◽  
Harmonic Vibrations ◽  
Actual Spectrum ◽  
Statistical Laws ◽  
Statistical Form

The view adopted in the following paper is that the radiation from a black body is an irregular disturbance subject to statistical laws. This view is, I believe, that now generally held. It is shown that these laws can be deduced from the observed distribution of energy in the spectrum and that they enable the general character of the disturbance to be described. At any point in an actual spectrum of the radiation we have a large number of simple harmonic vibrations of arbitrary phases and various amplitudes. The radiation may be regarded as the sum of all the simple vibrations in the spectrum. The component vibrations may be regarded as continually varying, but the distribution of energy in the spectrum, when averaged over a short interval, remains constant.

Model of Noise Source for HF Interference Calculation in a Converter Station

2007 ◽  
Vol 8 (6) ◽  
Author(s):  
Quanrui Hao ◽  
Zheng Xu
Keyword(s):  
Empirical Model ◽  
Noise Source ◽  
Equivalent Model ◽  
Basic Principles ◽  
Operating Modes ◽  
Snubber Circuit ◽  
Power Line Carrier ◽  
Actual Spectrum ◽  
Physical Quantities ◽  
Fft Analysis

For high-frequency (HF) interference in an HVDC converter station, the modeling of the noise source which causes interference with the power line carrier (PLC) remains a problem. Based on the profound analysis of the basic principles on which HF noise in PLC band is produced during the commutation process, the equivalent model of the HVDC valve with a snubber circuit is applied to the simulation of the GUI-GUANG HVDC project in PSCAD/EMTDC. Then spectrum plots of the noise source in the frequency domain are obtained by FFT analysis of the voltage waveforms gained from the simulation. Through analyzing the spectrum characteristics of the noise source in various operating modes, the main factors influencing the level of HF noise are found. Furthermore, a modified empirical model used to calculate the level of the noise source is introduced, with particular explanation of the physical quantities used in the model. The spectra of the noise source gained from the modified empirical model and from the simulation are compared with an actual spectrum based on the GUI-GUANG HVDC project. The results show that the modified empirical model can meet the requirement of HF interference calculation.

scholarly journals Performance Analysis in Heterogeneous Networks with Spatiotemporal Traffic and Scheduling

2020 ◽  
Vol 10 (8) ◽  
pp. 2901
Author(s):  
Jianfang Xin ◽  
Ying Wang ◽  
Qi Zhu ◽  
Guangjun Liang ◽  
Tianjiao Zhang
Keyword(s):  
Heterogeneous Networks ◽  
Heterogeneous Network ◽  
Point Processes ◽  
Frequency Reuse ◽  
Base Stations ◽  
Actual Spectrum ◽  
Direct Data ◽  
User Density ◽  
The Mean ◽  
Bernoulli Processes

In this work, we consider interference performance under direct data transmission in a heterogeneous network. The heterogeneous network consists of K-tier base stations and users, whose locations follow independent Poisson point processes (PPPs). Packet arrivals of users follow independent Bernoulli processes. Two different scheduling policies, round-robin (RR) and random scheduling (RS), are employed to all the Base Stations (BS). The universal frequency reuse mode is adopted to reveal actual spectrum reuse. By leveraging stochastic geometry and queueing theory, the interference interactions of the proposed network are accurately modelled. Accurate expressions for the mean packet throughputs of the network under universal frequency reuse mode are derived. The simulation results explore the optical bias factors in heterogeneous networks to maximize the mean packet throughput. Under a given user density, by changing BS densities, we achieved a certain mean packet throughput level.

Neoadjuvant therapy followed by resection versus upfront resection for pancreatic cancer: the actual spectrum and clinical burden of postoperative complications

Pancreatology ◽  
2017 ◽  
Vol 17 (3) ◽  
pp. S70-S71 ◽  
Author(s):  
Stefano Andrianello ◽  
Giovanni Marchegiani ◽  
Chiara Nessi ◽  
Marta Sandini ◽  
Tommaso Pollini ◽  
...  
Keyword(s):  
Pancreatic Cancer ◽  
Postoperative Complications ◽  
Neoadjuvant Therapy ◽  
Clinical Burden ◽  
Actual Spectrum

Neoadjuvant Therapy Versus Upfront Resection for Pancreatic Cancer: The Actual Spectrum and Clinical Burden of Postoperative Complications

2017 ◽  
Vol 25 (3) ◽  
pp. 626-637 ◽  
Author(s):  
Giovanni Marchegiani ◽  
Stefano Andrianello ◽  
Chiara Nessi ◽  
Marta Sandini ◽  
Laura Maggino ◽  
...  
Keyword(s):  
Pancreatic Cancer ◽  
Postoperative Complications ◽  
Neoadjuvant Therapy ◽  
Clinical Burden ◽  
Actual Spectrum
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