Polar Patterns
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چکیده
A polar pattern is a circular graph that shows how sensitive a microphone is in different directions. Each “circular” division represents 5dB of sensitivity, so you can see where the microphone picks up the strongest to the weakest sounds at different points. On the graph below, 0 degrees shows the direction the microphone is facing. 90 and 270 degrees are the sides of the microphone and 180 degrees the microphone’s back. The polar pattern below shows the solid line as a 1KHz signal. From 0 degrees the sensitivity drops more than 1 division (or more than 5dB) by the time it reaches 90 degrees. This means the side of the microphone is more than 5dBs less sensitive than the front of the microphone. Note 6dB is equal to half the microphone’s volume, so sound from the side will be half the volume of sound from the front of the microphone.
منابع مشابه
On the significance of alternating patterns of polar and non-polar residues in beta-strands.
A common assumption about protein sequences in beta-strands is that they have alternating patterns of polar and non-polar residues. It is thought that such patterns reflect the interior/exterior geometry of amino acid residue side-chains on a beta-sheet. Here we study the prevalence of simple hydrophobicity patterns in parallel and antiparallel beta-sheets in proteins of known structure and in ...
متن کاملNature disfavors sequences of alternating polar and non-polar amino acids: implications for amyloidogenesis.
Recent experiments with combinatorial libraries of de novo proteins have demonstrated that sequences designed to contain polar and non-polar amino acid residues arranged in an alternating pattern form fibrillar structures resembling beta-amyloid. This finding prompted us to probe the distribution of alternating patterns in the sequences of natural proteins. Analysis of a database of 250,514 pro...
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Relevant features in the visual image are often spatially extensive and have complex orientation structure. Our perceptual sensitivity to such spatial form is demonstrated by polar Glass patterns, in which an array of randomly-positioned dot pairs that are each aligned with a particular polar displacement (rotation, for example) yield a salient impression of spatial structure. Such patterns are...
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The final form of the polar lobe and lateral wings of developing semicells of M. rotata results from combined action of three growth processes: tip growth, branching and lobe broadening. Tip growth unaccompanied by branching or broadening occurs during normal development in M. radiata, but is observed only under abnormal conditions (e.g. raised temperature) in M. rotata. When branching and broa...
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Climate change has been identified as a major driver of habitat change, particularly for sea ice-dependent species such as the polar bear (Ursus maritimus). Population structure and space use of polar bears have been challenging to quantify because of their circumpolar distribution and tendency to range over large areas. Knowledge of movement patterns, home range, and habitat is needed for cons...
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Background: The maternal age effect for trisomy is well known. However what is less established is whether certain women are more (or less) prone to segregation errors, independent of age. Trisomy arises primarily through maternal meiosis I chromosome segregation errors however the precise mechanism by which these errors occur is unclear. Current dogma attributes the origin of trisomy to malseg...
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