Psophometer, is a device that measures the internal open circuit voltage of an equivalent noise generator having an impedance of 600 ohms and delivering noise power to a 600 ohms load.
Tuesday, 24 January 2012
Thursday, 17 November 2011
onload
$(document).ready(function () {
$.fancybox({
'width': '40%',
'height': '40%',
'autoScale': true,
'transitionIn': 'fade',
'transitionOut': 'fade',
'type': 'iframe',
'href': 'http://www.example.com'
});
}); http://stackoverflow.com/questions/807271/how-to-launch-jquery-fancybox-on-page-load
Tuesday, 13 September 2011
what generates a light beam at a specific visible frequency?
what generates a light beam at a specific visible frequency?
"Laser"
"Laser"
what is the frequency limit of an optical fiber?
what is the frequency limit of an optical fiber?
"40 GHz"
"40 GHz"
Sunday, 4 September 2011
Hyperbolic functions - sinh, cosh, tanh, coth, sech, csch
Note: to set hyperbolic function in FX-991ES just select [hyp] and select the function that you need",)
Hyperbolic cosine of x = cosh x = (ex + e-x)/2
Hyperbolic tangent of x = tanh x = (ex - e-x)/(ex + e-x)
Hyperbolic cotangent of x = coth x = (ex + e-x)/(ex - e-x)
Hyperbolic secant of x = sech x = 2/(ex + e-x)
Hyperbolic cosecant of x = csch x = 2/(ex - e-x)
coth x = 1/tanh x = cosh x/sinh x
sech x = 1/cosh x
csch x = 1/sinh x
cosh2x - sinh2x = 1
sech2x + tanh2x = 1
coth2x - csch2x = 1
Hyperbolic functions - sinh, cosh, tanh, coth, sech, csch
DEFINITION OF HYPERBOLIC FUNCTIONS
Hyperbolic sine of x = sinh x = (ex - e-x)/2Hyperbolic cosine of x = cosh x = (ex + e-x)/2
Hyperbolic tangent of x = tanh x = (ex - e-x)/(ex + e-x)
Hyperbolic cotangent of x = coth x = (ex + e-x)/(ex - e-x)
Hyperbolic secant of x = sech x = 2/(ex + e-x)
Hyperbolic cosecant of x = csch x = 2/(ex - e-x)
RELATIONSHIPS AMONG HYPERBOLIC FUNCTIONS
tanh x = sinh x/cosh xcoth x = 1/tanh x = cosh x/sinh x
sech x = 1/cosh x
csch x = 1/sinh x
cosh2x - sinh2x = 1
sech2x + tanh2x = 1
coth2x - csch2x = 1
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