runs through the chromatic scale . Usually, the Arraymbira contains two and a half repetitions of the entire ... octave Arraymbira uses 5 30 150 tines. The arrangement of the tines allows music to be played with relative ease in any key. Description Generally, the Arraymbira is large enough to allow two ... available on a lead instrument at this time, and that is the system used for organizing the Arraymbira. Because the Array system is isomorphic, any given chord, scale, or song, no matter how complex ... of playing an Arraymbira is that less shifting around of movement is required for playing a given ..., playing a melody on an ArrayMbira is unfamiliar for musicians who have trained on other instruments ... dissonant intervals. The Arraymbira is played by a number of notable musicians, including ... ArrayPlayers DEFAULTSORT ArrayMbira Category Custom made instruments Category Lamellophones ...Unreferenced date March 2011 File Arraymbiraplayed.jpg thumb right 300px Patrick Hadley playing an arraymbira The Arraymbira is a hand crafted modern musical instrument with a unique harp or bell like sound. It is made in the United States by its inventor Bill Wesley and manufactured by Wesley with Patrick Hadley in San Diego, California, United States. It is a radical redesign of the African mbira ... than other mbiras and kalimbas. Two types of Array mbiras are available, a hollow body and a solid ... of the Array System The notes are arranged according to the array system, developed by musicologist, performer, and author Bill Wesley. The Array system of organizing the notes is similar to the Wicki ... of the same note with one finger. The Array system is a specific pattern of arranging musical tones .... The Array system can be thought of not only as being based on the circle of fifths, but as being based ... octave of every note , complex rhythms and fast melodies are easier to play. The Array system allows .... An mbira with only two or three octaves is better suited to fast, complex melodies while the larger ... more details
Infobox Instrument name Mbira or Sanza names image Mbira1.png image capt Mbira dzavadzimu background ... desc Plucked idiophone range Varies, see Mbira Tuning Tuning related articles Mbira music In Music of Africa African music , the mbira also known as likembe , mbila , thumb piano , mbira huru , mbira njari , mbira nyunga nyunga , karimbao or kalimba is a musical instrument that consists of a wooden ... and Southern Africa there are many kinds of mbira, usually accompanied by the hosho instrument hosho . Among the Shona people there are three that are very popular see Shona music . The mbira ... 70s sanza was the generic term used to describe these members of the lamellophone family. Mbira ... whose music is based on and includes the mbira, and the work of Dumisani Maraire who brought marimba and karimba music to the US Pacific Northwest, Ephat Mujuru who was one of the pioneer teachers of mbira in the US, and the writings and recordings of Zimbabwean musicians made by Paul Berliner . Mbira ... of Africa . He states the mbira a finger xylophone , is native to Africa and is common throughout the continent .... Mbira Dzavadzimu main Mbira music Image mbira dzavadzimu in deze.jpg thumb Mbira dzavadzimu in a deze . Image Mbira dzavadzimu 1.jpg thumb right 200px Image Sanza.jpg thumb right 200px Image Mbira dzavadzimu.jpg thumb right 200px Image mbiras.jpg thumb right 200px In Shona music , the mbira dzavadzimu ... for thousands of years. The mbira dzavadzimu is frequently played at religious ceremonies and social gatherings called mabira sing. bira . A typical mbira dzavadzimu consists of between 22 and 28 ... Mbira A Beginning. Everett, PA HoneyRock. ISBN 0 9634060 4 3 ref are often affixed to the soundboard ... performance, an mbira dzavadzimu is frequently placed in a deze calabash resonator to amplify its sound. The mbira dza vadzimu is very significant in Shona people Shona Shona religion religion ... communication with ancestral spirits. Within the Shona tradition, the mbira may be played with paired ... more details
MedalTableTop MedalCountry RSA MedalSport Men s Boxing MedalCompetition All Africa Games MedalBronze 2007 All Africa Games 2007 Algiers Boxing at the 2007 All Africa Games Lightweight MedalBottom Owethu Mbira b. is a South Africa n boxer who won bronze at lightweight at the All African Games 2007. Career At the AllAfricans he upset local Hamza Kramou but was defeated by Saifeddine Nejmaoui . At the world championships he lost to Georgian Vasil Qazishvili. External links http amateur boxing.strefa.pl Championships WorldChamps2007.html World 2007 Persondata name Mbira , Owethu alternative names short description date of birth place of birth date of death place of death DEFAULTSORT Mbira, Owethu Category Living people Category South African boxers Category Lightweight boxers SouthAfrica boxing bio stub ... more details
cleanup date May 2008 In Music of Zimbabwe Zimbabwean music , mbira music is music played on an mbira , a traditional instrument of the Shona people of Zimbabwe. To many people Mbira music appears extremely repetitive, or cyclical. However, in most Mbira music, there are minute variations, suggestive of the minimalism minimalist movement in western music for example Philip Glass et al. . As usual in African music, rhythm plays an important part. The rhythm s are often quite intricate and to some extent dictate the form of the melody . Shona mbira music Generally, each mbira piece can be divided into four sections of twelve pulses each, although there are songs that divide into nine or eight pulses as well. Andrew Tracey refers to each cycle as a Bantu language chara ref name tracey Tracey, Andrew. 1970 . How to play the mbira dza vadzimu . Roodepoort, Transvaal, South Africa International Library of African Music. ref , which translates as version , but literally means fingering or thumb . Traditional Shona Mbira music is typically composed to two different parts, the Kushaura meaning to lead or to start and the Kutsinhira meaning to follow ref name berliner Paul Berliner Berliner, Paul . 1978 . The Soul of Mbira music and traditions of the Shona people of Zimbabwe. Berkeley University ... being the more simple part, and the kutsinhira more complicated. Shona mbira songs Kariga Mombe Means ... American students of the mbira, this song is often widely considered to be the first song taught ... on the mbira nyunga nyunga. Mahororo Named after a small river in Zimbabwe, used to welcome ... . Nyamaropa Literally means meat and blood. It is considered among the oldest of mbira music. According ... as a hunting song. The tonal center of this song is a fourth above the lowest note on the mbira. Kuzanga According to B. Michael Williams ref name williams Williams, B. Michael. 2001 Learning Mbira A Beginning ... mavembe tuning of the mbira as is Ngozi ye Muroora . References Reflist DEFAULTSORT Mbira Music ... more details
Chromatic scale aggregates Array system layout, on the arraymbiraArraymbira , a musical instrument ...An array is a systematic arrangement of objects, usually in rows and columns. Specifically, it may refer ... at run time, including Array data structure , an arrangement of items at equally spaced addresses in computer memory Array data type , used in a programming language to specify a variable that can be indexed Associative array , an abstract data structure model that generalizes arrays to arbitrary indices or various kinds of the above, such as Bit array or bit vector Dynamic array , allocated at run time Parallel array of records, with each field stored as a separate array Sparse array , with most elements omitted, to store a sparse matrix Variable length array Jagged array , where the rows have different lengths individually or various related concepts Vector processor Array processor , a computer to process arrays of data not to be confused with a processor arrayArray programming , using matrix algebra notation in programs not the same as array processing Array slicing , the extraction of sub arrays of an array or also Global Arrays , a library for parallel processing Intel Array Visualizer , a piece of scientific graphics software In mathematics and statistics An array or matrix mathematics e.g. a Monge array , a Costas array A standard array in coding theory In statistics, arrays are a name for some kinds of Category Experimental design Intersection array a concept of category theory The thinned array curse or sparse array curse, a theorem about elecromagnetic waves In technology ... array, such as a phased array , a tower array , etc. A speaker array, used to produce directional Sound Asynchronous array of simple processors Ball grid array , pin grid array , and land grid array , ways to connect integrated circuits Cache Array Routing Protocol CARP Color filter array , placed over an imaging array Disk array , such as the RAID Field emitter array , an electron source ... more details
multiple issues confusing January 2010 notability January 2010 unreferenced January 2010 orphan July 2010 wikify January 2011 Control Array mostly used in Visual Basic is the collection of controls that programmer put it in form VB Form . Control array is always a single dimensional Array data structure array . Control array is that you can add or delete array elements at run time. With some controls, it is very useful to define control arrays it depends on the application. Control arrays are a convenient way to handle groups of controls that perform a similar function. All of the events available to the single control are still available to the array of controls, the only difference being an argument indicating the index of the selected array element is passed to the event. Hence, instead of writing individual procedures for each control i.e. not using control arrays , you only have to write one procedure for each array. Category BASIC programming language family ... more details
In experiments in which additional factors are not likely to interact with any of the other factors, a saturated array can be used. In a saturated matrix mathematics array , a controllable design of experiments factor is substituted for the interaction of two or more by products. Using a saturated array, a two factor test matrix could be used to test three factors. Using the saturated array allows three factors to be tested in four tests rather than in eight, as would be required by a standard orthogonality orthogonal array. statistics stub Category Design of experiments ... more details
unreferenced date October 2011 In computer science , a sparse array is an Array data structure array ... null . The occurrence of zero elements in a large array is inconvenient for both computation and storage. An array in which there is large number of zero elements is referred to as being sparse. In case of sparse arrays, we can ask for a value from an empty array position. If we do this, then for array of numbers, it should return zero and for array of objects, it should return null. A naive implementation of an array may allocate space for the entire array, but in the case where there are few ... array is determined by other known features or statistical features of the array, for instance ... array . so what? blank space is not an indexed array sparse or not , indeed Representation Sparse Array can be represented as Sparse Array pos1 val1, pos2 val2,... or br Sparse Array pos1, pos2,... val1, val2,... which yields a sparse array in which values math val i math appear at positions math pos i math . Sparse Array as Linked List An obvious question might be asked that why we need linked list to represent sparse array if we can represent it using normal array easily. The answer to this question lies in the fact that while representing sparse array as normal array, a lot of space is allocated for zero or null elements. For example, consider following array declaration br double arr 1000 1000 br When we define this array an enough space of 1,000,000 doubles is allocated. As each double requires 8 bytes of memory, this array will require 8 million bytes of memory. Now this being a sparse array, most of its elements will have a zero or null value. Hence, defining this array will soak ... is to represent the array using linked list which requires less memory as elements having non zero value only are stored. Also, the array elements can be accessed through less number of iterations than normal array when linked lists are used. br A sparse array as linked list contains nodes linked ... more details
orphan date December 2008 For the DVD magazine, see Array DVD magazine Deleted image removed Image ARRAY magazine.jpg right 150px ARRAY Magazine is a New York based interior design, lifestyle and culture quarterly magazine sponsored by the New York Design Center . It has been published since the winter of 2003 2004. With 40,000 readers, ARRAY is geared toward interior design professionals and their clients. External links http www.arrayny.com ARRAY Homepage Category Interior design Category Quarterly magazines Category Media in New York City Category Publications established in 2003 Category Magazines published in New York art mag stub hu ARRAY Magazine ... more details
File Aerial antenna.JPG thumb right 250px A multiband US television reception antenna Antenna array may refer to Antenna array electromagnetic a group of isotropic radiators such that the currents running through them are of different amplitudes and phases Interferometry Interferometric array of radio telescopes used in radio astronomy Phased array , also known as a smart antenna , an electronically steerable directional antenna typically used in Radar and in wireless communication systems, in view to achieve beamforming , multiple input and multiple output MIMO communication or space time coding Directional array refers to multiple antennas arranged such that the superposition of the electromagnetic waves produce a predictable electromagnetic field. Direction finding Watson Watt .2F Adcock antenna array Watson Watt Adcock antenna array the Watson Watt technique uses two Adcock antenna pairs to perform an amplitude comparison on the incoming signal. References reflist disambig ... more details
Unreferenced stub auto yes date December 2009 A sensor array is a set of several sensors used to gather information. Usually the sensors and sensed phenomenon are both directional in nature, but this isn t always the case. Sometimes the data varies by position but not by direction. DEFAULTSORT Sensor Array Category Sensors Electronics stub ... more details
Array processing is signal processing of the outputs of an array of sensor s to Enhance the SINR signal to interference plus noise ratio SINR compared to that of a single sensor using conventional or adaptive ... , and other signal parameters. Track multiple moving sources. Array processing is used in radar ... of using array processing along with an array of sensors is a smaller foot print. The problems associated with array processing include the number of sources used, their direction of arrival direction ... courses ee381k lectures 13 Array Processing lecture13 lecture13.pdf Spatial Array Processing . Signal and Image Processing Seminar. University of Texas at Austin. ref There are four assumptions in array ... and nondispersive medium. The second assumption is that for far field array processing, the radius of propagation is much greater than size of the array and that there is plane wave propagation. The third ..., M. http users.ece.utexas.edu bevans courses ee381k lectures 13 Array Processing lecture13 lecture13.pdf Spatial Array Processing . Signal and Image Processing Seminar. University of Texas at Austin ... over large periods of time are needed just as in visible sky viewing. Array gain is done by using ... with array processing ever since to measure seismic activity around the globe. ref http www.norsar.no ... and 120 auxiliary seismic stations around the world. NORSAR has ongoing work to improve array processing ... www.norsar.no pc 31 83 Improving IMS array processing.aspx ref See also Phased Array Space Time Adaptive Processing References reflist cite book title Array Signal Processing last1 Johnson first1 D ... title Optimum Array Processing publisher Wiley location New York year 2002 cite journal first1 H ... Two Decades of Array Signal Processing Research journal IEEE Signal Processing Magazine pages 67 94 month July year 1996 accessdate 8 December 2010 S. Haykin and K.J.R. Liu Editors , Handbook on Array ... nas lehre SS 08 PS Smart Antennas slides proj sem.pdf array processing courseware DEFAULTSORT Array ... more details
In MIMO communication systems, array gain means a power gain of transmitted signals that is achieved by using multiple antennas at transmitter and or receiver, with respect to Single Input and Single Output SISO case. It can be simply called power gain . In a broadside array, the array gain is almost exactly proportional to the length of the array. This is the almost always the case provided that the elements of the antenna are not spaced to a point at which large radiation side lobs form in other directions and that the array length exceeds one or two wavelengths. The power gain of a broadside array is nearly independent of the number of broadside elements as long as both of these conditions are met. ref http www.smeter.net daily facts 12 fact5.php ref The two main types of array gain when combining signals are average power of combined signals relative to the individual average power and the diversity gain related to the probability level of outage. The diversity gain is dependent on spacial correlation coefficients between antenna signals. ref Andersen, J.B. , Array gain and capacity for known random channels with multiple element arrays at both ends, Selected Areas in Communications, IEEE Journal on , vol.18, no.11, pp.2172 2178, Nov 2000 doi 10.1109 49.895022 ref Applications In radio astronomy because of background noise from modern communications it is difficult to achieve a good signal to noise ratio. Even for strong astronomical radio emission it is typical for SNR levels to be below 0 decibel. To counter this problem exposure of the antenna to the source over large periods of time are needed just as in visible sky viewing. Array gain is done by using multiple, even dozens of radio receivers to collect as much signal as possible. Robots equipped with antenna arrays have better communication using array gain to eradicate dead spots and reduce interferences. ref Hambling, David. Robots fall into line with the help of sparse array antenna. New Scientist 207 2010 ... more details
File Dynamic array.svg thumb Several values are inserted at the end of a dynamic array using geometric ... size and capacity of the final array are shown. In computer science , a dynamic array , growable array , resizable array , dynamic table , or array list is a random access , variable size list ... in many modern mainstream programming languages. A dynamic array is not the same thing as a dynamic memory allocation dynamically allocated array , which is a fixed size Array data structure array whose size is fixed when the array is allocated, although a dynamic array may use such a fixed size array ... class from OpenJDK 6 . ref Bounded size dynamic arrays and capacity The simplest dynamic array is constructed by allocating a fixed size array and then dividing it into two parts the first stores the elements of the dynamic array and the second is reserved, or unused. We can then add or remove elements at the end of the dynamic array in constant time by using the reserved space, until this space is completely consumed. The number of elements used by the dynamic array contents is its logical size or size , while the size of the underlying array is called the dynamic array s capacity , which ..., the fixed size data structure suffices. This may be short sighted, when problems with the array filling up turn up later. It is best to put resize code into any array, to respond to new conditions ... array is an expensive task, typically involving copying the entire contents of the array. Geometric ..., the capacities form a geometric progression . Expanding the array by any constant proportion ensures ... Array Implementation pages 39 41 . ref ref name clrs Introduction to Algorithms chapter 17.4 Dynamic ... array has performance similar to an array, with the addition of new operations to add and remove ... in the middle of the array linear time Inserting or deleting an element at the end of the array constant ... memory region, it may be expensive or impossible to find contiguous space for a large dynamic array ... more details
In computer architecture , a systolic array is a pipe network arrangement of processing units called ... array is composed of matrix like rows of data processing units called cells. Data processing units ... of a program counter , ref The Paracel GeneMatcher series of systolic array processors do have a program ... immediately after processing. The systolic array is often rectangular where data flows across the array ... streams entering and leaving the ports of the array are generated by auto sequencing memory units, ASMs ... . One matrix math matrix is fed in a row at a time from the top of the array and is passed down the array, the other matrix is fed in a column at a time from the left hand side of the array ... whole row and one whole column. At this point, the result of the multiplication is stored in the array and can now be output a row or a column at a time, flowing down or across the array. ref http web.cecs.pdx.edu mperkows temp May22 0020.Matrix multiplication systolic.pdf Systolic Array Matrix Multiplication ... them. Because the traditional systolic array synthesis methods have been practiced by algebraic ... with asynchronous handshake between DPUs are called wavefront arrays . One well known systolic array ... system has a linear array processor connected by data buses going in both directions. History The systolic array paradigm, data stream driven by data counters, is the counterpart of the von Neumann architecture ... array usually sends and receives multiple data streams, and multiple data counters are needed to generate ... 2 x a n 3 x ... a 1 x a 0 math A linear systolic array in which the processors are arranged in pairs ... Highly specialized for particular applications Difficult to build Super Systolic Array The super systolic array is a generalization of the systolic array. Because the classical synthesis methods ... array the super systolic array. Its application is not restricted to applications with regular ... array. More information about the background may be obtained from the articles about Systolic array ... more details
A Commission of Array was a Letters patent commission given by England English royalty to officers or gentry in a given territory to muster and array the inhabitants and to see them in a condition for war, or to put soldier s of a country in a condition for military service. The term arrayers is used in some ancient English statutes, for an officer who had a Commission of Array. Commissions of array developed from the ancient obligation of all free men to defend their country. Commissioners were usually experienced soldiers, appointed by the crown to array able bodied men from each shire. By the time of the Wars of the Roses conscript levies were less important than troops raised by indenture . Though obsolete by the 17th century, the system was revived by Charles I of England Charles I in 1642 in opposition to the 1641 Militia Ordinance that gave Parliament of England Parliament control of raising troops in order to muster a Cavalier Royalist army at the onset of the English Civil War . See also Arrayer Posse comitatus common law Posse comitatus References 1828 Webster s Dictionary 1728 http digicoll.library.wisc.edu cgi bin HistSciTech HistSciTech idx?type turn&entity HistSciTech000900240187&isize L DEFAULTSORT Commission Of Array Category English Civil War Category Military history of the United Kingdom Category Command staff occupations England stub Mil hist stub UK hist stub th ... more details
Unreferenced date December 2009 A macrocell array is an approach to the design and manufacture of Application specific integrated circuit ASIC s. Essentially, it is a small step up from the otherwise similar gate array , but rather than being a prefabricated array of simple logic gates, the macrocell array is a prefabricated array of higher level logic functions such as Flip flop electronics flip flop s, Arithmetic logic unit ALU functions, Hardware register register s, and the like. These logic functions are simply placed at regular predefined positions and manufactured on a wafer electronics wafer , usually called master slice . Creation of a circuit with a specified function is accomplished by adding metal interconnects to the chips on the master slice late in the manufacturing process, allowing the function of the chip to be customised as desired. Macrocell array master slices are usually prefabricated and stockpiled in large quantities regardless of customer orders. The fabrication according to the individual customer specifications may be finished in a shorter time compared with standard cell or full custom design. The macrocell array approach reduces the Photomask mask costs since fewer custom masks need to be produced. In addition manufacturing test tooling lead time and costs are reduced since the same test fixtures may be used for all macrocell array products manufactured on the same die manufacturing die size. Drawbacks are somewhat low density and performance than other approaches to ASIC design. However this style is often a viable approach for low production volumes. DEFAULTSORT Macrocell Array Category Gate arrays es Matriz de macroc lulas ru ... more details
Orphan date February 2009 An extrachromosomal array is a method for mosaic analysis in genetics . It is a cosmid , and contains two functioning wild type closely linked genes a gene of interest and a mosaic marker . Such an array is injected into germ line cells, which already contain mutant specifically, loss of function alleles of all three genes in their chromosome chromosomal DNA . The cosmid, which is not packed correctly during mitosis , is occasionally present in only one daughter cell following cell division. The daughter cell containing the array expresses the gene of interest the cell lacking the array does not. The mosaic marker is a gene which exhibits a visible phenotype change between the functioning and non functioning alleles. For example, ncl 1 , located in chromosomal DNA, exhibits a larger nucleolus than the wild type allele, which is in the array. Thus, cells which exhibit larger nucleoli have usually not retained the extrachromosomal array. The gene of interest is the target of the mosaic analysis. Cells lacking the extrachromosomal array also lack the functional gene of interest. Cells which develop normally without the array do not require the gene of interest for normal function. Cells which do not develop normally are said to require the gene. In this way, those cell lineages which require a specific gene can be identified. Extrachromosomal arrays replace an earlier technique involving a duplicated piece of chromosome called a free duplication . The latter technique required that the gene of interest and the mosaic marker be closely linked on the duplication the former allows free choice of mosaic marker and target gene. References Miller LM, Waring DA, Kim SK 1996 . Mosaic analysis using a ncl 1 extrachromosomal array reveals that lin 31 acts in the Pn.p cells during Caenorhabditis elegans vulval development. Genetics 143 3 1181 1191. Category Genetics genetics stub ... more details
Image CHARA array.jpg thumb 250px The Operations Center of the CHARA array The CHARA Array is an optical astronomical interferometer operated by The Center for High Angular Resolution Astronomy CHARA of the Georgia State University GSU . CHARA is the World s highest angular resolution telescope at near infrared wavelengths. It is located at the Mount Wilson Observatory , near Los Angeles, California . The CHARA Array is an interferometer formed from six 1 meter 40 inch telescopes arranged along three axes with a maximum separation length of 330 m. The light beams travel through vacuum tubes and are combined optically, requiring a building 100 meters long with movable mirrors to keep the light in phase as the earth rotates. CHARA began scientific use in 2002 and began routine operations in early 2004. In the infrared, the array has an interferometric imaging resolution of 0.0005 arcseconds . All six telescopes are in regular use for scientific observations and as of late 2005 imaging results are routinely acquired. The array captured the first image of the surface of a main sequence star other than the sun published in early 2007. ref http www.ns.umich.edu htdocs releases story.php?id 5877 U M astronomers capture the first image of surface features on a sun like star , University of Michigan , 2007 05 31 ref See also Image chara 2000 09 15.JPG thumb 250px Looking down on the top of Mount Wilson, including the historic 100 Hooker telescope center , the 60 telescope center left , and the GSU CHARA Array. Cambridge Optical Aperture Synthesis Telescope COAST Infrared Optical Telescope Array Magdalena Ridge Observatory Interferometer Palomar Testbed Interferometer Navy Prototype ... http olbin.jpl.nasa.gov news chara 18Sept05.html First 4 Telescope Fringes at the CHARA Array ... Array. III. Oblateness, Rotational Velocity and Gravity Darkening of Alderamin archiv.org http discovermagazine.com ... Category Interferometric telescopes observatory stub de CHARA Array it CHARA Array ru CHARA ... more details
Multiple issues unreferenced December 2009 context October 2009 Image HP HASS NIKE.jpg thumb Hewlett Packard disk arrays HASS top and NIKE OEM d Data General SCSI Clariion Image EMC Clariion CX500.jpg thumb EMC Corporation EMC CLARiiON CX500 Cover removed on one Shelf Image EMC Symmetrix DMX1000 Front.jpg thumb EMC Corporation EMC Symmetrix DMX1000 A disk array is a disk storage system which contains multiple disk drive s. It is differentiated from a disk enclosure , in that an array has cache memory and advanced functionality, like redundant array of independent disks RAID and Storage virtualization virtualization . Components of a typical disk array include Disk array controller s Cache memories Disk enclosure s Power supply Power supplies Typically a disk array provides increased availability, resiliency and maintainability by using additional, redundant components controllers, power supplies, fans, etc. , often up to the point when all single point of failure single points of failure SPOFs are eliminated from the design. Additionally those components are often hot swappable. Typically, disk arrays are divided into categories Network attached storage NAS arrays storage area network SAN arrays Modular SAN arrays Monolithic SAN arrays Utility Storage Arrays Storage virtualization DEFAULTSORT Disk Array Category Computer storage Category Fault tolerant computer systems Category RAID de Disk Array fr Baie de stockage ja pl Macierz dyskowa ru ... more details
Unsourced image removed Image Antenna flat panel.png thumb 400px A planar array fractal antenna In telecommunication s and radar , a planar array is an antenna electronics antenna in which all of the elements, both driven element active and passive radiator parasitic , are in one plane. A planar array provides a large aperture antenna aperture and may be used for directional beam control by varying the relative phase waves phase of each element. A planar array may be used with a reflecting screen behind the active plane. ref FS1037C MS188 ref A planar array with a reflecting screen is related to a Radar absorbent material radar absorber . Both are supposed not to reflect incoming radiation of the desired wavelength. Radar absorbers have the advantage that they can use magnetic materials to avoid reflections at the interface to air at least for some frequencies. For antennas to be broadband, the transition from air vacuum to the metal of the screen has to be a gradual one. Radar absorbers have the advantage that they do not have to collect the received energy. The antenna needs a Three dimensional space 3D tree of twin lead s and choke electronics chokes to connect a single cable to a large number of micro antennas. Micro dipole antennas are only resonant at a single high frequency, to be broadband the arms of adjoining antennas have to be connected. Footnotes reflist Category Radio frequency antenna types electronics stub ... more details
Unreferenced date December 2006 A tower array is an arrangement of multiple Radio masts and towers radio tower s which are mast radiator s in a phased array . Tower arrays can consist of free standing or guyed towers or a mix of them. Tower arrays are used to constitute a directional antenna of a mediumwave or longwave radio station . The number of towers in a tower array can vary. In many arrays all towers have the same height, but there are also arrays of towers of different height. The arrangement can vary. For directional antennas with fixed radiation pattern , linear arrangements are preferred, while for switchable directional patterns usually for daytime groundwave versus nighttime skywave , square arrangements are chosen. Examples Tower arrays with guyed masts Longwave transmitter Europe 1 Transmitter Weisskirchen Beidweiler Longwave Transmitter Transmitter Wachenbrunn Transmitter Ismaning VoA Station Tower arrays with free standing towers Junglinster Longwave Transmitter Orfordness transmitting station See also Twin Towers disambiguation directional antenna longwave mediumwave directional array References reflist DEFAULTSORT Tower Array Category Broadcast engineering Category Telecommunications equipment Category Telecommunications infrastructure Category Towers Category Radio frequency antenna types Mast stub ... more details
Unreferenced date January 2007 In broadcast engineering , directional array refers to an Antenna array electromagnetic antenna array arranged such that the Superposition principle superposition of the electromagnetic wave s produce a predictable electromagnetic field . By spacing 2 or more antenna elements apart, changing the length of the transmission line from the transmitter , varying the power output, and shifting the Phase waves phase , radio Broadcasting broadcasters can shape the area of signal coverage. Geographically close Co channel interference co channel or adjacent channel stations employ directional arrays or a single directional antenna so that other broadcasters may utilize the same or adjacent frequency . In the United States , the Federal Communications Commission offers a first come, first served approach, meaning licenses granted on co channel or adjacent channels must protect the service contour of the previously licensed facility, thus, a directional array may be used to shape the station around existing facilities. DEFAULTSORT Directional Array Category Broadcast engineering Category Radio frequency antenna types pl Szyki kierunkowe Telecomm stub ... more details
File JBL VerTec line arrays 4889 x 9 & 4880a subs x 4 .jpg thumb A JBL Vertec line array at a concert A line array is a loudspeaker system that is made up of a number of loudspeaker elements coupled together ... line array displays a normally wide horizontal pattern useful for supplying sound to the majority of a concert ... as a horizontal line array unless the signal supplied to them is adjusted delayed, polarized, equalized ... to the array will also lower the frequency in which the array achieves a directional dispersion pattern. The large format line array has become the standard for large concert venues and outdoor festivals .... The lower portion of the line array is generally curved backward to increase dispersion at the bottom of the array and allow sound to reach more audience members. Typically, cabinets used in line arrays ... driver column loudspeaker polar patterns, taken at six frequencies The line array effect of the narrowing ... talks about line array concepts ref He published his findings in his 1957 text, Acoustical Engineering. ref http www.meyersound.com support papers line array theory.htm ref Olson used line array concepts ... for asking P3 ref A multi band line array elements in a horizontally oriented enclosure was suggested ... team talks about line array concepts ref However it was L Acoustics V DOSC line array in the mid ... can come from fewer boxes in a line array. As soon as people realized that there was no destructive ... to know about line arrays and thanks for asking P3 ref Theory Pure line array theory is based on pure ... applied to the dispersion pattern of a line array. It means that when you stack a number of loudspeakers .... A vertical array of like drivers will have the same horizontal polar pattern as a single driver. Other than the narrowing vertical coverage, the length of the array also plays a role in what wavelengths will be affected by this narrowing of dispersion. The longer the array, the lower frequency the pattern ... in a line array will start to become omni directional, so the system will not conform to line ... more details
In computing , a parallel array is a data structure for representing array data structure array s of Record computer science records . It keeps a separate, homogeneous array for each field of the record, each having the same number of elements. Then, objects located at the same index in each array are implicitly the fields of a single record. Pointers from one object to another are replaced by array indices. This contrasts with the normal approach of storing all fields of each record together in memory. For example, one might declare an array of 100 names, each a string, and 100 ages, each an integer, associating each name with the age that has the same index. An example in C programming language C using parallel arrays source lang c int ages 0, 17, 2, 52, 25 char names None , Mike , Billy , Tom , Stan int parent 0 None , 3 Tom , 1 Mike , 0 None , 3 Tom for i 1 i 4 i printf Name s, Age d, Parent s n , names i , ages i , names parent i source in Perl using a hash of arrays to hold references to each array source lang perl my data first name Joe , Bob , Frank , Hans , last name Smith , Seger ... issues. For example, one of the fields of the record can be a single bit, and its array would only need ... so that it consumes an entire byte or a word. If the number of items is small, array indices can .... Sequentially examining a single field of each record in the array is very fast on modern machines, since this amounts to a linear traversal of a single array, exhibiting ideal locality of reference ... array . They are expensive to grow or shrink, since each of several arrays must be reallocated ... into groups of fields that are generally accessed together, an array can be constructed for each ... the portions of the structure tied together. An alternative to tying them together using array indexes ... dimensional array by declaring an array of n m size and referring to the r th field in record i as element as array m i r . Some compiler optimization s, particularly for vector processor s, are able ... more details
Encyclopedia
top
