Pulse repetition frequency: Difference between revisions

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{{Use dmy dates|date=June 2013}}
Once the device is installed, it needs to get professionally calibrated. Google, etc) tell you what your kiddos curiosity turns up. There would have been a time when CCTV systems used VCR's for recording video clips. Installation of these equipment requires a whole new level of training, knowledge, as well as certification as a way to make sense of all this.<br><br>
{{distinguish|Carrot|Carat}}
{{About|the spacing character that resembles a chevron|use as a diacritic or "hat" modifying another character (as in â)|Circumflex|other uses of the word "caret"|Caret (disambiguation)|the math function|Exponentiation}}


{{Punctuation marks|^|ASCII caret<br/>(circumflex accent)|variant-size=520%<!--
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-->|variant1=‸|caption1=Unicode caret<!--
-->|variant2=⁁|caption2=Caret insertion point<!--
-->|variant3=^|caption3=[[Fullwidth form|Fullwidth]] circumflex accent}}
The '''caret''' {{IPAc-en|ˈ|k|ær|ə|t}} is an inverted V-shaped [[grapheme]]. Specifically, ''caret'' commonly refers to the spacing character '''^''' in [[ASCII]] (at [[code point]] 5E[[hexadecimal|<sub>hex</sub>]]) and other [[character set]]s that may also be called a ''hat'', ''control'', ''uparrow'', or less frequently ''[[Chevron (insignia)|chevron]]'', ''[[Exclusive or|xor]] sign'', ''to the'' [''[[Exponentiation|power of]]''], ''fang''{{fact|date=November 2013}}, ''shark'' (or ''shark-fin''){{fact|date=November 2013}}, ''pointer'' (in [[Pascal (programming language)|Pascal]]),<ref name="Jargon File">{{cite web | url = http://www.science.uva.nl/~mes/jargon/a/ascii.html | title = ASCII | work = The Jargon File 4.2.0 | publisher = Arjan de Mes | date = 31 January 2000 | accessdate = 19 August 2012 }}</ref> or ''wedge''. Officially, this character is referred to as ''[[circumflex]] accent'' in both ASCII<ref name="SWCS"/> and [[Unicode]]<ref name="Unicode Basic Latin"/> terminology (because of its historical use in [[overstrike]]), whereas ''caret'' refers to a similar but lowered Unicode character: {{unichar|2038|caret}}. Additionally, there is another lowered variant with a stroke: {{unichar|2041|caret insertion point}}.<ref name="Unicode General Punctuation"/>
 
The caret and circumflex are not to be confused with other chevron-shaped characters, such as {{unichar|028C|[[Turned v|Latin letter turned v]]}} or {{unichar|2227|[[logical and]]}}, which may occasionally be called carets too.<ref name="Unicode IPA Extensions"/><ref name="Weisstein"/>
 
==Origins==
 
===Proofreading mark===
 
The caret was originally used, and continues to be, in handwritten form as a [[proofreading]] mark to indicate where a punctuation mark, word, or phrase should be inserted in a document.<ref name="MLA" /> The term comes from the [[Latin]] ''caret'', "it lacks", from ''carēre'', "to lack; to be separated from; to be free from".<ref name="Merriam-Webster" /> The caret symbol is written below the line of text for a line-level punctuation mark such as a [[comma]], or above the line as an inverted caret (cf. {{unichar|02C7|[[caron]]}}) for a higher character such as an [[apostrophe]];<ref name="APA"/> the material to be inserted may be placed inside the caret, in the margin, or above the line.
 
===Circumflex accent===
 
A raised variant of the symbol can be found on some [[typewriter]]s, where it is used to denote a [[circumflex]] in some languages, such as French and [[Portuguese language|Portuguese]]. It is typically a [[dead key]], which does not cause the carriage to advance and thus allows the following letter to strike the same spot (below the circumflex) on the paper.
 
As regards [[computer system]]s, the original 1963 version of the ASCII standard reserved the code point 5E<sub>hex</sub> for an [[Arrow (symbol)|up-arrow ({{unicode|↑}})]]. However, the 1965 [[List of Ecma standards|ECMA-6 standard]] replaced the up-arrow with a circumflex (^), which was applicable as a [[diacritic]] as well, and two years later, the second revision of ASCII followed suit.<ref name="Jennings" /> As the early [[mainframe computer|mainframe]]s and [[minicomputer]]s largely used [[teleprinter]]s as output devices, it was possible to print the circumflex above a letter when needed. With the proliferation of [[monochrome monitor|monitor]]s, however, this was seen insufficient, and [[precomposed character]]s, with the diacritic included, were instead introduced into appended character sets, such as [[Latin-1]]. The original circumflex character was left for other purposes, and as it did not need to fit above a letter anymore, it became larger in appearance.<ref name="Korpela" />
 
==Other uses==
 
===Programming languages===
 
The caret has many uses in [[programming language]]s. It can signify exponentiation, the bitwise [[XOR]] operator, [[string concatenation]], and [[control character]]s in [[caret notation]], among other uses. In [[regular expression]]s, the caret is used to mark the beginning of a string, or the beginning of a line within that string (depending on the regular expression dialect and specified options); if it begins a character class, it indicates that the inverse of the class is to be matched. [[Pascal (programming language)|Pascal]] uses the caret when dereferencing [[pointer (computer programming)|pointer]]s. [[Go (programming language)|Go]] also uses it as a [[bitwise NOT]] operator.
 
In [[Smalltalk]], the caret takes the function of the return statement. In a method, <code> ^ 1 </code> would cause the method to exit and return the number <code>1</code>.
 
In C++/CLI the only type of pointer is C++ pointer, and the .NET reference types are accessed through a "handle", with the new syntax ClassName^ instead of ClassName*. This new construct is especially helpful when managed and standard C++ code is mixed; it clarifies which objects are under .NET automatic garbage collection and which objects the programmer must remember to explicitly destroy. In development for Apple's Mac OS X and iOS, carets are used to create [[Blocks (C language extension)|blocks]], and to denote block types.
 
Since the character was originally not available in all character sets and keyboard layouts, [[ANSI C]] can transcribe it in form of the [[C trigraph|trigraph]] <code>??'</code> which, even inside string literals, is equivalent to the <code>^</code> character. [[C++]] additionally supports tokens like <tt>xor<tt> (for "<tt>^</tt>") and <tt>xor_eq<tt> (for "<tt>^=</tt>") to avoid the character altogether.
[[RFC 1345]] recommends to transcribe the character as [[Digraph (computing)|digraph]] <code>'></code>, if not available.<ref name="RFC1345">[http://tools.ietf.org/html/rfc1345 RFC 1345]</ref>
 
===Surrogate symbol for superscript and exponentiation===
 
In [[mathematics]], the caret can signify [[exponentiation]] (3^5 for <math>3^5</math>), where the usual [[Subscript and superscript|superscript]] is not readily usable (as on some [[graphing calculator]]s). The caret is also now used to indicate a superscript in {{TeX}} typesetting. As [[Isaac Asimov]] described it in his 1974 "Skewered" essay (on [[Skewes' number]]), "I make the exponent a figure of normal size and it is as though it is being held up by a lever, and its added weight when its size grows bends the lever down."<ref name="Asimov" /> The use of the caret for exponentiation can be traced back to [[ALGOL 60]],{{citation needed|date=August 2012}} which expressed the exponentiation operator as an upward-pointing arrow, intended to evoke the superscript notation common in mathematics. The upward-pointing arrow is now used as a form of [[Tetration|iterated exponentiation]] in [[Knuth's up-arrow notation]].
 
===Escape character===
 
The command-line interpreter, [[cmd.exe]], of Windows family of operating systems uses the caret (^) to [[escape character|escape]] reserved characters. '''Example:'''
  C:\> ECHO  Show greater than: ^> pipe: ^| less than: ^< caret: ^^ and  ^%TMP^% and ^&
      Show greater than: > pipe: | less than: < caret: ^ and  %TMP% and &
 
===Ordinal indicator===
 
In Italian, the caret is sometimes used in a similar manner to the [[ordinal indicator]], most noticeably on tickets from [[Trenitalia]], the primary operator of trains within Italy, and [[Rome|Rome's]] ATAC public transit system. On Trenitalia tickets, the [[travel class]] is often written as 1^ or 2^, meaning [[First class travel|first class]] or second class respectively. This is due to the lack of the feminine [[Ordinal indicator#Galician, Italian, Portuguese, and Spanish|ordinal indicator (<sup>-a</sup>)]] used in Italian in the ASCII set (the masculine ordinal indicator is usually replaced by the [[degree sign]] when extended characters are not available or in less accurate typesetting).
 
===Signature tag===
 
In [[social network service]]s such as [[Twitter]], a caret placed before a word is used to tag that word as an individual's signature within a group account. This differentiates an individual's contribution from a group-authored contribution.
 
===Upwards-pointing arrow===
 
In [[internet forum]]s, [[social networking sites]] such as Facebook, or in [[online chat]]s, a caret or a series of carets may be used beneath or after the post of one user by another user. In this usage, the caret ^ represents an upwards-pointing arrow meaning for readers, [[Posting style|post]]ers or the [[original post]] (OP) to see the above line/post,<ref name="Computer Hope" /> and in addition to the arrow usage, can also mean that the user who posted the ^ agrees with the above post.
 
==References==
{{Reflist|refs=
 
<ref name="APA">{{cite book | title = Publication Manual of the American Psychological Association | edition = 5th | year = 2001 | publisher = [[American Psychological Association]] | location = Washington, DC | isbn = 1-55798-791-2 | page = 338}}</ref>
 
<ref name="Asimov">[[Isaac Asimov]] (1974), "Skewered", ''Of Matters Great and Small'', [[Doubleday (publisher)|Doubleday]], [[International Standard Book Number|ISBN]] [[Special:BookSources/978-0385022255|978-0385022255]]</ref>
 
<ref name="Computer Hope">{{cite web | title = What is Caret? | url = http://www.computerhope.com/jargon/c/caret.htm | publisher = [[Computer Hope]]| accessdate = 14 August 2012}}</ref>
 
<ref name="Jargon File">{{cite web | url = http://www.science.uva.nl/~mes/jargon/a/ascii.html | title = ASCII | work = The Jargon File 4.2.0 | publisher = Arjan de Mes | date = 31 January 2000 | accessdate = 19 August 2012 }}</ref>
 
<ref name="Jennings">{{cite web | url = http://www.wps.com/projects/codes/index.html#UP | title = ASCII: American Standard Code for Information Infiltration | author = Tom Jennings | accessdate = 14 September 2010 }}</ref>
 
<ref name="Korpela">{{cite web| url = http://www.cs.tut.fi/~jkorpela/kirjaimet/tarinoita.pdf | title = Kirjainten tarinoita | author = Jukka K. Korpela | pages = 132–133 | date = 18 January 2010 | accessdate = 14 September 2010 | language = Finnish }}</ref>
 
<ref name="Merriam-Webster">{{cite web | url = http://www.merriam-webster.com/dictionary/caret | title = Caret | publisher = Merriam-Webster | accessdate = 19 August 2012}}</ref>
 
<ref name="MLA">{{cite book | title = MLA Handbook for Writers of Research Papers | edition = 7| year = 2009 | publisher = [[Modern Language Association]] | location = New York| isbn = 978-1-60329-024-1 | page = 121}}</ref>
 
<ref name="SWCS">{{cite web | url = http://www.swcs.com.au/ansi.htm | title = AT & T's Baudot to ASCII | publisher = Stephen Williamson Computing Services | accessdate = 19 August 2012}}</ref>
 
<ref name="Unicode Basic Latin">{{cite web | url = http://unicode.org/charts/PDF/U0000.pdf | title = C0 Controls and Basic Latin | author = Unicode | date = 1991–2012 | accessdate = 19 August 2012}}</ref>
 
<ref name="Unicode General Punctuation">{{cite web | url = http://unicode.org/charts/PDF/U2000.pdf | title = General Punctuation | author = Unicode | date = 1991–2012 | accessdate = 19 August 2012}}</ref>
 
<ref name="Unicode IPA Extensions">{{cite web | url = http://unicode.org/charts/PDF/U0250.pdf | title = IPA Extensions | author = Unicode | date = 1991–2012 | accessdate = 20 August 2012}}</ref>
 
<ref name="Weisstein">{{cite web | url = http://mathworld.wolfram.com/Caret.html | title = Caret | author = Eric W. Weisstein | work = MathWorld | publisher = Wolfram | accessdate = 20 August 2012 }}</ref>
 
}}
 
[[Category:Punctuation]]
[[Category:Typographical symbols]]
[[Category:Logic symbols]]

Latest revision as of 02:14, 24 September 2014

Once the device is installed, it needs to get professionally calibrated. Google, etc) tell you what your kiddos curiosity turns up. There would have been a time when CCTV systems used VCR's for recording video clips. Installation of these equipment requires a whole new level of training, knowledge, as well as certification as a way to make sense of all this.

There needs to be specific places in your home where you are completely disconnected from technology such as the bathroom along with the dinner table. This technology is very exceptional because footages are simply recorded when motion triggers the DVR system.

Though controversial, the use of CCTV camera systems has been a positive development for businesses and law enforcement cctv cameras systems all in the world. CCTV security system is considered being the most effective way of reducing crime.

A pen camera is normally available is 2 GB, 4GB and 8 GB storage capacities. At home, the spouses don't have to argue between watching George Clooney or perhaps the Hawaiian Tropic girls. Each applicant is going to be judged with the covers accessibility of services offered and cost effectiveness. Additionally there will be the Red Alert DVR and the Alpha Defend & Deter 4 channel DVR.

When CCTV cameras along with the DVR items are all around it ensures that there is really a third eye which can be continuously observing you. This Gurgaon property is located in Sector 66, at the intersection of Golf Course Extension Road as well as the Sohna Road.

Plus, many providers also offer high speed Internet and telephone services. Get full fee details that whatever they will gonna charge before hiring in order that at the time of paying you will not faces any clashes achievable security service. Because CCTV deters burglars and intruders, many people tend to utilize CCTV as part of the home's security package. These video images could be monitored live, or stored for viewing later.

As soon as the images are recorded, they could be played returning and forth till conclusions are created. You will use this application look around the Linux internals of the Android phone. The door lock may well not work properly or even the key getting stuck. This technology is extremely old and outdated and is rapidly being replaced by digital recording technology which now represents over 80% coming from all new installations. It also needs to import and export the documents; therefore it needs a format that's compatible with other software as well. They broadcast a number of exercise programs that run in ½ hour or one hour segments and include anything from yoga to aerobics to belly dancing.

Also, complete protection from infrared, red, green, blue and UV lasers would require use of completely black filters, rendering the camera useless. It may be a great way for couples as well as friends and family members to shell out a relaxing evening together. Instead, it really is simply relayed to a receiver that may be monitored by the property owner. They can also be used on the interior of the house, especially in the event you regularly employees inside, like babysitters, nannies, etc.

We need to give them credit, they usually have a very clue as to what exactly is happening, but don't know why it's happening or what caused it. Some could differ depending around the features and specifications, even though some others may greatly vary depending on the size along with the price from the product.

Some with the cameras are now made with all the facility to auto lightening system that may work inside the darkness. This camera features a cctv surveillance system suppliers different size and different quantity of bulbs as well, from 64 in order to six bulbs.

CCTV over IP can give you a host of advantages compared to standard analogue dvr card suppliers CCTV. Unfortunately, however, I'm becoming painfully aware that my metabolism is changing and that having some kind of your daily workout routine is definitely in order. I connected with all the heightened had-it-ness as they broke up another fight.