Xpert - 25 Most recent items matching the search terms - http://www.pat.comThis RSS feed contains the 25 most recently submitted items from Xpert, matching the search terms - Xperten-gbhttp://creativecommons.org/licenses/by-nc-sa/2.0/uk/ Xpert<![CDATA[8.2 Octave pitch and frequency increments]]>Because a doubling of frequency corresponds to an octave increase of pitch, it follows that there is no constant increment of frequency that always corresponds to a one-octave increment of pitch. That is to say, there is no fixed amount by which a frequency can be augmented that will always produce a one-octave pitch rise.

For instance, starting at the pitch A_{4} with a frequency of 440 Hz, we need to augment the frequency by 440 Hz to get the pitch one octave above (880 Hz). B]]>
Because a doubling of frequency corresponds to an octave increase of pitch, it follows that there is no constant increment of frequency that always corresponds to a one-octave increment of pitch. That is to say, there is no fixed amount by which a frequency can be augmented that will always produce a one-octave pitch rise.

For instance, starting at the pitch A_{4} with a frequency of 440 Hz, we need to augment the frequency by 440 Hz to get the pitch one octave above (880 Hz). B]]>
<![CDATA[9.2 Dynamic range]]>The quietest sound we can hear corresponds to a pressure wave with an amplitude of about 10 μPa, which is a very small pressure amplitude indeed. It is about 0.000 000 01 per cent of nominal atmospheric pressure, and the resultant displacement of the eardrum is less than a tenth of the diameter of a hydrogen molecule.

At the upper end of the scale, a sound that is distressingly loud might typically correspond to a pressure wave with an amplitude of 0.01 per cent of nominal atmospheric ]]>
The quietest sound we can hear corresponds to a pressure wave with an amplitude of about 10 μPa, which is a very small pressure amplitude indeed. It is about 0.000 000 01 per cent of nominal atmospheric pressure, and the resultant displacement of the eardrum is less than a tenth of the diameter of a hydrogen molecule.

At the upper end of the scale, a sound that is distressingly loud might typically correspond to a pressure wave with an amplitude of 0.01 per cent of nominal atmospheric ]]>
<![CDATA[10.4 Summary]]>The decibel (symbol dB) is a way of expressing a ratio. It is based on logarithms, and so adding decibels is equivalent to multiplying their corresponding ratios. Decibels can be used to express absolute values by referring them to a reference value.

A common use of decibels is to express ratios of amplitudes. For instance, the amplification (or gain) of an amplifier can be expressed either as the ratio of the output and input amplitudes, or as a certain number of decibels. With a multi]]>
The decibel (symbol dB) is a way of expressing a ratio. It is based on logarithms, and so adding decibels is equivalent to multiplying their corresponding ratios. Decibels can be used to express absolute values by referring them to a reference value.

A common use of decibels is to express ratios of amplitudes. For instance, the amplification (or gain) of an amplifier can be expressed either as the ratio of the output and input amplitudes, or as a certain number of decibels. With a multi]]>
<![CDATA[1 The importance of law in social work education]]>In this course you will be asked to reflect on the meanings of both social work and law. You will find that these concepts are open to a range of possible definitions, and that the functions of social work and law can change depending on the practice context. Their meaning is also affected by the perspective from which they are viewed, for example the service user's experience of social work and law will not always match the expectations of the professional, or the perceptions of the general ]]>
In this course you will be asked to reflect on the meanings of both social work and law. You will find that these concepts are open to a range of possible definitions, and that the functions of social work and law can change depending on the practice context. Their meaning is also affected by the perspective from which they are viewed, for example the service user's experience of social work and law will not always match the expectations of the professional, or the perceptions of the general ]]>
<![CDATA[3.5 The language of law]]>A potential barrier to understanding, which those new to law can find off-putting, is the use of specialist terminology. This contributes to the perception of law as an elitist and difficult area of study and is something that requires further explanation. Many professions (and social groups) develop their own forms of language to communicate effectively and, in some cases, to signify group membership. In this sense legal language is not unique, but is does have a formal character which can s]]>
A potential barrier to understanding, which those new to law can find off-putting, is the use of specialist terminology. This contributes to the perception of law as an elitist and difficult area of study and is something that requires further explanation. Many professions (and social groups) develop their own forms of language to communicate effectively and, in some cases, to signify group membership. In this sense legal language is not unique, but is does have a formal character which can s]]>
<![CDATA[COMP2214 - Lecture 20 - Security Engineering]]>]]>
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<![CDATA[Praxeology and the Method of Economics]]>Dr. Joe Salerno joins Jeff Deist to explore another foundational topic: the method of economics. Mises developed praxeology, perhaps his most controversial contribution to economic science. Praxeology starts with fundamental axioms, then derives economic theory by working logically through a deductive process. As such, praxeology is at odds with logical positivism and empiricism—and presents a markedly different approach to economics.