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antenna
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     The Sinuous Antenna
     曲折臂天线
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     Antenna Test
     天线测试
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Prolate Spheroidal Wave Functions (PSWFs) are a well-studied subject with applications in signal processing, wave propagation, antenna theory, etc.
      
Analysis of airborne antenna using a FEM-UTD hybrid method
      
In this paper, the near-field vector components were used to combine the FEM method and the uniform-geometrical theory of diffraction (UTD) method for analyzing phased array antenna mounted on an airborne platform.
      
Effect of random surface errors on radiation characteristics of the side-fed offset Cassegrain antenna
      
In this paper the average power pattern of the side-fed offset Cassegrain (SFOC) dual reflector antenna is analyzed, and the effect of the random surface error on radiation characteristics of the antenna is introduced.
      
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A method based upon simple diffraction theory is described for the calculation of modified paraboloid reflectors to produce from a point source a shaped beam of arbitrary shape in one plane and uniformly narrow in the perpendicular planes. A specific application of the shaped beam antennas is in connection with radar antennas designed for height finding. In this case the antenna must have a sharp elevation beam for obtaining precise elevation information and a rapid elevation scan. The beam must be relatively...

A method based upon simple diffraction theory is described for the calculation of modified paraboloid reflectors to produce from a point source a shaped beam of arbitrary shape in one plane and uniformly narrow in the perpendicular planes. A specific application of the shaped beam antennas is in connection with radar antennas designed for height finding. In this case the antenna must have a sharp elevation beam for obtaining precise elevation information and a rapid elevation scan. The beam must be relatively broad in azimuth in order that the target will be held in the beam long enough to obtain height information. If a fixed minimum of illumination is to be achieved at a given linear distance on both sides of the center line of the azimuth beam, the amplitude pattern must have the so-called "double cosecant" or "beavertail" shape.

本论文讨论如何利用简单衍射理论,计算改良抛物面反射器天线幅射之图型。此反射器可将一无方向性辐射源之能量聚集于任何形状之波束中。此原理可以应用在地面上或船面上寻求飞机高度雷达天线之设计。在此类雷达中,天线之方位图型必须为“双馀割平方”式;其特性为自波束对称轴线起,至其两端,辐射一次路程之功率,与方位角之馀割平方成正比。得此图型之最简易方法为置一狭窄之铅垂金属条于一截形抛物面反射器之中心,金属条之宽度,可改变波束之方向性;其支距,即金属条与反射器之距离,可影响两反射波之位相。故改变金属条之宽度及其支距,可得欲得之图型。 利用衍射及干涉理论,计算金属条及截形抛物面所生之总图型为:在方位面内,幅射强度J_H与水平角θ之关系为: J_H =AA[sin~2(15πsinθ)/(15πsinθ)~2-2(1-cosπ/4)sin(2πsinθ)/2πsinθ(sin(2πsinθ)/2πsinθ-sin(15πsinθ)/15πsinθ)]A为辐射波振幅,A为A之复共轭数。计算之结果与实验之结果,颇为一致。

1. In South Sinkiang, eggs deposited by the migratory locust, Locusta migra-toria migratoria L., in Aug. 1952 hatched ih the latter part of April, and adultsemerged on June 6 the following year. This species has only one generation ayean and the eggs remain underground for a period of 8 months. 2. Calliptamus italicus L. can be easily identified by the presence of a longprosternal spine between the fore coxae. The distal portion of the cercus inthe male individual is divided into three lobes, the middle one...

1. In South Sinkiang, eggs deposited by the migratory locust, Locusta migra-toria migratoria L., in Aug. 1952 hatched ih the latter part of April, and adultsemerged on June 6 the following year. This species has only one generation ayean and the eggs remain underground for a period of 8 months. 2. Calliptamus italicus L. can be easily identified by the presence of a longprosternal spine between the fore coxae. The distal portion of the cercus inthe male individual is divided into three lobes, the middle one being shorterthan the upper one. 3. Heavy damage was done to pasture land by Gomphocerus sibericus L.. Thisspecies is characterized by the swellen terminal segments of the antennae. Inthe male individuals, the tibiae of the fore legs are also enlarged. 4. Dociostaurus kraussi Ing. may be identified by the presence of an X-shaped marking on the pronotum and the much eniarged markings on themetazone. 5. Ramburiella turcomana F-W. has a slant face Which meets the vertexat an acute angle. Besides the X-shaped marking on the pronotum, there isanother broad line running along the median ridge. 6. The distinguishing Character of the grasshopper Oedaleus decorus Germ.is the blackish band that runs across the hing wings. The pronotal medianridge is high, with a very promineat X-shaped marking on its sides. 7. In Sphingonatus salinus (Pall) the small prozone with a high median ridge,and the two bands across the hind wings are quite characteristic. 8. In this paper distributions of the above-mentioned species are listed. Des-criptions of the egg capsules and the sculpturing on the egg shells have beenmade for the purpose of facilitating specific identification in the field.

(一)新疆蝗虫种类繁多,发生为害面积亦大。1953年全新疆发生面积为762,000公顷,共防治95,703公顷。经两年来的初步观察,蝗虫中为害性较大,分布较普遍的有下述九种。 1.迁移飞蝗一年发生一代。1952年8月所产之卵,最早于1953年4月下旬孵化,至6月6日变为成虫。蝗卵在地下发育阶段,长达8月之久。 2.意大利蝗主要特征在其突出之前胸腹板刺;前胸背板有中脊和侧脊;雄虫尾须末端分裂为三叶,中叶之末端不及上叶末端。 3.西伯利亚蝗为牧区中牧草的大敌害。成虫主要特征为触角末端变粗;雄虫前足胫节膨大如梨状。 4.克鲁斯蝗沟后区上之花纹变宽,成三角形;前翅不超过后足膝部;后足胫节红色。而鞑靼蝗沟后区上的花纹前端并不变粗。 5.侧视土克曼蝗头部倾斜;前胸背板上除有较长大的X形图案外,中脊上尚有纵行花纹;后足腿节和胫节黄色,间隔以黑色斑纹。 6.轮翅蝗前胸背板之中脊拱起,其两侧有X形图案;后翅基部淡黄绿色,中部有一条宽而弯曲的黑色条纹,不及后翅的后缘。 7.盐地圆背蝗沟前区小而狭隘;后翅基部淡红色,中部及翅端各有—条宽的黑色条纹。与盐地圆背蝗相似者,尚有八纹圆背蝗。 (二)对上述九种蝗虫之分布,卵囊及卵壳上之花纹...

(一)新疆蝗虫种类繁多,发生为害面积亦大。1953年全新疆发生面积为762,000公顷,共防治95,703公顷。经两年来的初步观察,蝗虫中为害性较大,分布较普遍的有下述九种。 1.迁移飞蝗一年发生一代。1952年8月所产之卵,最早于1953年4月下旬孵化,至6月6日变为成虫。蝗卵在地下发育阶段,长达8月之久。 2.意大利蝗主要特征在其突出之前胸腹板刺;前胸背板有中脊和侧脊;雄虫尾须末端分裂为三叶,中叶之末端不及上叶末端。 3.西伯利亚蝗为牧区中牧草的大敌害。成虫主要特征为触角末端变粗;雄虫前足胫节膨大如梨状。 4.克鲁斯蝗沟后区上之花纹变宽,成三角形;前翅不超过后足膝部;后足胫节红色。而鞑靼蝗沟后区上的花纹前端并不变粗。 5.侧视土克曼蝗头部倾斜;前胸背板上除有较长大的X形图案外,中脊上尚有纵行花纹;后足腿节和胫节黄色,间隔以黑色斑纹。 6.轮翅蝗前胸背板之中脊拱起,其两侧有X形图案;后翅基部淡黄绿色,中部有一条宽而弯曲的黑色条纹,不及后翅的后缘。 7.盐地圆背蝗沟前区小而狭隘;后翅基部淡红色,中部及翅端各有—条宽的黑色条纹。与盐地圆背蝗相似者,尚有八纹圆背蝗。 (二)对上述九种蝗虫之分布,卵囊及卵壳上之花纹,均分别叙及;并附有作者原绘图六幅。在调查蝗虫分布密度及蝗种鉴别上,识别卵囊较有根据。

In the present paper three species of Lamproglena are reported with two nauplius larvae belonging to Lamproglena chinensis and L. carassii.1. Nauplius larva of Lamproglena chinensis (fig. 11)The larva is pyriform or ovoid in outline, with a sharp process at its posterior end. The body is slightly transparent, measuring 0.209 mm in its total length and 0.125 mm in the greatest width. The yolk spherules are small and numerous. There are three pair of appendages. First antenna has two joints and bears three...

In the present paper three species of Lamproglena are reported with two nauplius larvae belonging to Lamproglena chinensis and L. carassii.1. Nauplius larva of Lamproglena chinensis (fig. 11)The larva is pyriform or ovoid in outline, with a sharp process at its posterior end. The body is slightly transparent, measuring 0.209 mm in its total length and 0.125 mm in the greatest width. The yolk spherules are small and numerous. There are three pair of appendages. First antenna has two joints and bears three setae. Second antenna is biramus: exopod singlejointed and with three setae at terminal end; endopod possessing three joints and bearing four setae. Mandible is also biramus; exopod possessing three joints and endopod only one joint. The posterior end has a pair of setae functional as balancers.2. Lamproglena orientalis Markewitsch, 1936 (figs. 1-10)The female specimen is parasitic on the gills of Erythroculter erythropterus (Nanking, Wushin), E. recurviceps (Nanking), E. dabryi (Shanghai, Soochow), Culter albernus (Shanghai, Wushi) and C. brevicauda (Shanghai, Soochow and Wushi).The body is cylindrical, somewhat depressed, being 1.71 to 2.60 mm in total length. The abdomen is without segmentation, the length of the abdomen varying from 0.27 to 0.34 mm in length. The caudal ramusis finger-shaped and without any processes.Antennae are present. Mandible (formerly called first maxilla)is "S"-shaped, with small teeth at its terminal end. A hook-like spine present at the terminal end of first maxilla (formerly called second maxilla). The maxillipeds are not far away from the mouth parts, and possess three hook-like spines at the terminal end. Fives pairs of swimming legs are present. The basipodites of the 1-4 legs each bears a seta. For seta formula of this species see figures 6 to 10.3. Lamproglena carassii Sproston et al., 1950.The female specimen is found on the gills of Carassius auratus taken from Nanking, Wushi. This species differs from the type specimen in the following particulars:(1) The terminal end of the abdomen is not pointed.(2) A seta present on the basipodite of the first to fourth legs.(3) A seta on the second joint of the exopod of the fourth leg.Nauplius larva of Lamproglena carassii (fig. 24).Body is ovoid in shape, measuring 0.327 mm in length by 0.137 mm in width. The yolk spherules are less numerous than those found in the nauplius larva of L. chinensis. There are three pairs of appendages, as found in the nauplius larva of L. chinensis. The exopod of its mandible possesses four joints instead of only 3, as in L. chinensis.

(1)这次在南京至上海一带从淡水魚的鳃上共获得了3种狹腹鳋(中华狹腹鳋、东方 狹腹鳋和鯽狹腹鳋),并对中华狹腹鳋和鯽狹腹鳋的无节幼体也加以補充描述。 (2)从这次所得的东方狹腹鳋來看,腹部的长度存在着明显的变异,又增添五种新宿主鱼。 (3)本文对鯽狹腹鳋的特徴,有新的補充和修正。

 
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