Rhipidognathidae is a family of multielement conodonts from the Ordovician.
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Spark source mass spectrometry has been used for trace analysis and multielement analysis applications for highly conducting, semiconducting, and nonconducting materials. Some examples of SSMS applications are the trace element analysis of high-purity materials, multielement analysis of elements in technical alloys, geochemical and cosmochemical samples, biological samples, industrial stream samples, and radioactive material.
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Long wire antennas are reported to be more effective for reception than multielement antennas such as Yagi or quad antennas with the same length of wire.
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Appalachignathus is a genus of multielement conodonts from the Middle Ordovician of North America. The elements of Appalachignathus are amongst the first occurrences of the Ozarkodina-type feeding apparatuses.
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Initially, they jointly developed a greatly improved instrument. Subsequently, Melloni worked alone, developing an instrument in 1833 (a multielement thermopile) that could detect a person 10 metres away.Barr, E. S. (1962). The infrared pioneers—II.
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Stig M. Bergström (born 12 June 1935 in Skövde) is a Swedish-American paleontologist. In 1981, he described the conodont family Paracordylodontidae.Family Paracordylodontidae Bergström. SM Bergström, Treatise on invertebrate paleontology, Part W, 1981 In 1974, he described the multielement conodont genus Appalachignathus from the Middle Ordovician of North America.
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Anticostiodus is an extinct genus of multielement conodonts. Specimens have been described from the Lower Silurian (early Aeronian) of Gun River Formation of Anticosti Island, Quebec. Two species are included under the genus, Anticostiodus fahraeusi and Anticostiodus boltoni. Both species occur near the base of the Distomodus staurognathoides zone and in an open subtidal environment.
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In photographic and microscopic lenses, dispersion causes chromatic aberration, which causes the different colors in the image not to overlap properly. Various techniques have been developed to counteract this, such as the use of achromats, multielement lenses with glasses of different dispersion. They are constructed in such a way that the chromatic aberrations of the different parts cancel out.
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A multielement tunable magnetic medium was reported by Zhao et al. This structure immersed SRRs in liquid crystals, and achieved a 2% tunable range.Q. Zhao, L. Kang, B. Du, B. Li, J. Zhou, H. Tang, X. Liang, and B. Zhang, Appl. Phys. Lett. 90, 011112 (2007) BST-loaded SRRs comprising tunable metamaterial, encapsulates all of the tunability within the SRR circuit.
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Yagi antenna with one driven element (A) called a folded dipole, and 5 parasitic elements (B and C). A feed line leading to the receiver (not shown)) is attached to the driven element at D. In a multielement antenna array (such as a Yagi-Uda antenna), the driven element or active element is the element in the antenna (typically a metal rod) which is electrically connected to the receiver or transmitter. In a transmitting antenna it is driven or excited by the RF current from the transmitter, and is the source of the radio waves. In a receiving antenna it collects the incoming radio waves for reception, and converts them to tiny oscillating electric currents, which are applied to the receiver. Multielement antennas like the Yagi typically consist of a driven element, connected to the receiver or transmitter through a feed line, and a number of other elements which are not driven, called parasitic elements.
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Mesogondolella is an extinct genus of conodonts.Mesogondolella and Jinogondolella (Conodonta): Multielement definition of the taxa that bracket the basal Guadalupian (Middle Permian Series) GSSP. Lance L. Lambert, Bruce R. Wardlaw and Charles M. Henderson, Palaeoworld, Volume 16, Issues 1–3, January–September 2007, Pages 208–221, The species M. daheshenensis and M. subgracilis are from the Permian (probably Wordian) of the Daheshen Formation in China.The age of the Daheshen Formation in Jilin Province based on conodonts.
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The driven element is often a dipole. The parasitic elements act as resonators and couple electromagnetically with the driven element, and serve to modify the radiation pattern of the antenna, directing the radio waves in one direction, increasing the gain of the antenna. An antenna may have more than one driven element, although the most common multielement antenna, the Yagi, usually has only one. For example, transmitting antennas for AM radio stations often consist of several mast radiators, each of which functions as a half-wave monopole driven element, to create a particular radiation pattern.
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Curtain arrays are a class of large multielement directional wire radio transmitting antennas, used in the shortwave radio bands. They are a type of reflective array antenna, consisting of multiple wire dipole antennas, suspended in a vertical plane, often in front of a "curtain" reflector made of a flat vertical screen of many long parallel wires. These are suspended by support wires strung between pairs of tall steel towers, up to high. They are used for long-distance skywave (or skip) transmission; they transmit a beam of radio waves at a shallow angle into the sky just above the horizon, which is reflected by the ionosphere back to Earth beyond the horizon.
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