The relationship between the impulse response and angular spectrum methods to evaluate acoustic transient fields

1991 ◽  
Vol 90 (5) ◽  
pp. 2794-2798 ◽  
Author(s):  
P. Stepanishen ◽  
M. Forbes ◽  
S. Letcher
Keyword(s):  
Impulse Response ◽  
Angular Spectrum ◽  
Acoustic Transient ◽  
The Relationship

scholarly journals The duality principle and new forms of the inverse Laplace transform for the analysis of signal propagation in inhomogeneous media with dispersion

2019 ◽  
Vol 489 (6) ◽  
pp. 558-563
Author(s):  
A. G. Pavelyev ◽  
A. A. Pavelyev
Keyword(s):  
Laplace Transform ◽  
Impulse Response ◽  
Angular Spectrum ◽  
Signal Propagation ◽  
Inhomogeneous Media ◽  
Inverse Laplace Transform ◽  
Duality Principle ◽  
Causality Principle ◽  
Speed Of Light ◽  
Laplace Transform Inversion

New equations for Laplace transform inversion are obtained. The equations satisfy the causality principle. The impulse response of a channel is determined in order to analyze dispersion distortions in inhomogeneous media. The impulse response excludes the possibility that the signal exceeds the speed of light in the medium. The transmission bandwidth, the angular spectrum, and the Doppler shift in the ionosphere are computed.

scholarly journals Investigation of Angular Spectrum of Scattered Inert Gas Ions from the InGaP (001) Surface

2021 ◽  
Vol 22 (4) ◽  
pp. 742-745
Author(s):  
M.K. Karimov ◽  
U.O. Kutliev ◽  
S.B. Bobojonova ◽  
K.U. Otabaeva
Keyword(s):  
Azimuthal Angle ◽  
Angular Spectrum ◽  
Inert Gas ◽  
Angle Of Incidence ◽  
Surface Studies ◽  
Spatial Variables ◽  
The Relationship ◽  
Focusing Properties ◽  
Scattered Beam

It has been shown that this method is quite suitable for surface studies and diagnostics of many component materials. The values of the azimuthal angle of distribution of Ne, Ar and Xe ions scattered from InGaP (001) <110> are obtained. The relationship between the spatial variables of the scattered beam (mainly azimuthal angular spectra) and the type of ions has been established. The correlation between focusing properties of surface semichannel with a type of bombardment ion at the different angle of incidence has been shown.    

scholarly journals Exports as a Determinant of Inflation in Kenya: Disaggregated Econommetric Analysis

2017 ◽  
Vol 13 (10) ◽  
pp. 417
Author(s):  
Evans Ovamba Kiganda ◽  
Scholastica Adhiambo ◽  
Nelson Obange
Keyword(s):  
Time Series ◽  
Central Bank ◽  
Granger Causality ◽  
Impulse Response ◽  
Response Analysis ◽  
Vector Autoregressive ◽  
Impulse Response Analysis ◽  
Long Run ◽  
The Government ◽  
The Relationship

The purpose of this study was to examine exports as a determinant of inflation in Kenya: A disaggregated econometric analysis with specific objectives of establishing the relationship between domestic exports and inflation in Kenya and determining the relationship between re - exports and inflation in Kenya. This was occasioned by inconclusive and incomprehensive analysis on the relationship between exports and inflation given mixed results and failure by scholars to disaggregate total exports into domestic exports and re-exports. Correlation research design was employed using monthly time series obtained from Central Bank of Kenya (CBK) data spanning 132 months from January 2005 to December 2015.Vector Autoregressive (VAR) techniques of cointegration, Granger causality and impulse response analysis were employed. Results indicated a significant positive and negative long run relationship between domestic exports and re- exports with inflation in Kenya respectively that were supported by the impulse response analysis. A unidirectional causality running from domestic exports to inflation and re-exports to inflation was also established. The study concluded that domestic exports and re-exports determine inflation in Kenya with domestic exports having greater influence and therefore recommended that the government of Kenya needs to advocate for a trade policy that aims at reducing exports of domestically produced products and increase re-exports. This will ensure that only surplus is exported to reduce shortage of domestically produced commodities hence a reduction in price for the products.

scholarly journals On Minimal Second-order IIR Bandpass Filters with Constrained Poles and Zeros

2021 ◽  
Vol 53 (4) ◽  
pp. 210401
Author(s):  
Endra Joelianto
Keyword(s):  
Impulse Response ◽  
Bandpass Filter ◽  
Bandpass Filters ◽  
Second Order ◽  
Infinite Impulse Response ◽  
Frequency Range ◽  
Notch Filters ◽  
Filter Structure ◽  
Poles And Zeros ◽  
The Relationship

In this paper, several forms of infinite impulse response (IIR) bandpass filters with constrained poles and zeros are presented and compared. The comparison includes the filter structure, the frequency ranges and a number of controlled parameters that affect computational efforts. Using the relationship between bandpass and notch filters, the two presented filters were originally developed for notch filters. This paper also proposes a second-order IIR bandpass filter structure that constrains poles and zeros and can be used as a  minimal parameter adaptive digital second-order filter. The proposed filter has a wider frequency range and more flexibility in the range values of the adaptation parameters.

Empirical Research on the Relationship between Investment of Environmental Protection and Economic Growing of Shanghai

2011 ◽  
Vol 361-363 ◽  
pp. 1066-1070
Author(s):  
Ling Wang ◽  
Yang Yang ◽  
Li Juan Wang ◽  
Jiang Guo
Keyword(s):  
Economic Growth ◽  
Environmental Protection ◽  
Empirical Research ◽  
Impulse Response ◽  
Response Function ◽  
Impulse Response Function ◽  
Coordinated Development ◽  
Environmental Investment ◽  
Multiplier Effects ◽  
The Relationship

This paper uses Impulse Response Function to empirically analyze the relationship between investment of environmental protection and economic growing of Shanghai. The result shows that Shanghai economic growth relatively contributes more to the environmental investment， while the improvement of environmental investment affects little on the economic growth. Shanghai should further promote multiplier effects of the environmental investment on economic growth in order to achieve the coordinated development between investment of environmental protection and economic growth.

scholarly journals Remittances and corruption in Nigeria

2020 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Folorunsho M. Ajide ◽  
John A. Olayiwola
Keyword(s):  
Impulse Response ◽  
Variance Decomposition ◽  
Response Analysis ◽  
Estimation Variance ◽  
Content Type ◽  
Impulse Response Analysis ◽  
Dynamic Ols ◽  
The Impact ◽  
The Relationship ◽  
Control Of Corruption

PurposeIn this paper, we investigate the impact of remittances on control of corruption in Nigeria for a period of 1986–2016.Design/methodology/approachThe study uses ARDL modeling framework, dynamic OLS estimation, variance decomposition and impulse response analysis to examine the relationship between the two variables.FindingsThe study finds that remittances significantly improve the control of corruption in Nigeria. We further examine the robustness test of the results using dynamic OLS estimation, variance decomposition and impulse response analysis. Our results remain significant and consistent to the earlier one reported in ARDL framework which supports the extant literature.Practical implicationsOur study suggests that international remittances can be used, through the cross-border transfer of norms and practices, to significantly impact the socioeconomic progresses of a country by reducing corruption.Originality/valueThe existing studies on the relationship between corruption and remittances document conflicting results. In addition, study on corruption - remittances nexus that specifically focuses on any African country is largely absent despite the fact that most of the countries in the region are recognized as highly corrupt. This paper provides insights on how remittances can be used as part of tool kits to control corruption in African nation.

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