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Algorithms is a monthly peer-reviewed open-access scientific journal of mathematics, covering design, analysis, and experiments on algorithms. The journal is published by MDPI and was established in 2008. The founding editor-in-chief was Kazuo Iwama (Kyoto University).. From May 2014 to September 2019, the editor-in-ch... | Algorithms (journal) | [
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Telecommunications in Antigua and Barbuda are via media in the telecommunications industry. This article is about communications systems in Antigua and Barbuda.
==Telephone==
Telephones – main lines in use: 37,500 (2006)
:country comparison to the world: 168
Telephones – mobile cellular: 110,200 (2006) (APUA PCS, Cable... | Telecommunications in Antigua and Barbuda | [
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1160
|-
| FM 92.9
| VYBZ-FM
| Vybz FM
| Saint John's, Antigua
|
|-
| FM 93.9
| Unknown
| Caribbean SuperStation
| Saint John's, Antigua
| repeats Caribbean SuperStation from Trinidad
|-
| FM 95.7
| Unknown
| Zoom Radio
| Saint John's, Antigua
|
|-
| FM 97.1
| ZDK
| Radio ZDK
| Saint John's, Antigua
| repeats AM 1100
|-... | Telecommunications in Antigua and Barbuda | [
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know/Not stated
|20.58%
|70.61%
|8.81%
|-
!Total
!48.35%
!49.81%
!1.84%
|}
{| class="wikitable sortable"
|+Household internet access by ethnicity
! rowspan="2" |Q48 Ethnic
! colspan="3" |Q25 4 Internet access
|-
!No
!Yes
!Don't know/not declared
|-
|African descendent
|51.99%
|38.20%
|9.81%
|-
|Caucasian/White
|14.56%
... | Telecommunications in Antigua and Barbuda | [
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This article is about communications systems in Anguilla.
==Telephone==
Telephones – main lines in use: 6,200 (2002)
:country comparison to the world: 212
Telephones – mobile cellular: 1,800 (2002)
:country comparison to the world: 211
Telephone system:
Domestic: Modern internal telephone system
International: EAST CAR... | Telecommunications in Anguilla | [
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FM 100.1 MHz
| Unknown
| Caribbean Beacon
| The Valley
| Religious broadcaster
|-
| FM 100.9 MHz
| Unknown
| CBN – Country Broadcast Network
| The Valley
| 3 kW
|-
| FM 103.3 MHz
| Unknown
| Kool FM
| The Valley
| Religious broadcaster, Urban Caribbean
|-
| FM 105.1 MHz
| ZRON-FM
| Tradewinds Radio
| The Valley
| 5 kW,... | Telecommunications in Anguilla | [
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Acoustic theory is a scientific field that relates to the description of sound waves. It derives from fluid dynamics. See acoustics for the engineering approach.
For sound waves of any magnitude of a disturbance in velocity, pressure, and density we have
:
\begin{align}
\frac{\partial \rho'}{\partial t} +\rho_0... | Acoustic theory | [
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we then have the acoustic wave equation that describes the system:
:
\frac{1}{c^2}\frac{\partial^2 \phi}{\partial t^2} - \nabla^2\phi = 0
Where we have
:
\begin{align}
\mathbf{v} & = -\nabla \phi \\
c^2 & = (\frac{\partial p}{\partial \rho})_s\\
p' & = \rho_0\frac{\partial \phi}{\partial t}\\
\rho' & = \frac{\r... | Acoustic theory | [
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+ (\rho_0+\rho')(\mathbf{v}\cdot\nabla)\mathbf{v} + \nabla p' & = 0
\end{align}
===A Moving Medium===
Starting with
:
\begin{align}
\frac{\partial \rho'}{\partial t} +\rho_0\nabla\cdot\mathbf{w}+\nabla\cdot \rho'\mathbf{w} & = 0 \\
(\rho_0+\rho')\frac{\partial \mathbf{w}}{\partial t} + (\rho_0+\rho')(\ma... | Acoustic theory | [
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that we keep terms to first order, for the continuity equation, we have the \rho'\mathbf{v} term going to 0. This similarly applies for the density perturbation times the time derivative of the velocity. Moreover, the spatial components of the material derivative go to 0. We thus have, upon rearranging the equilibrium ... | Acoustic theory | [
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+ \frac{1}{\rho_0}\nabla p' & = 0
\end{align}
===For Irrotational Fluids===
In the case that the fluid is irrotational, that is \nabla\times\mathbf{v} = 0, we can then write \mathbf{v} = -\nabla\phi and thus write our equations of motion as
:
\begin{align}
\frac{\partial p'}{\partial t} -\rho_0c^2\nabla^2\phi... | Acoustic theory | [
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