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some technical
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  若干技术
     Adopted a high temperature quick extraction technology and a rotary vacuum disk filter with a filter area of 78 m~2in the phosphoric acid plant of 15 kt P_2O_5/a, which was put into production in 1991, and applied some technical measures, the problems of scaling in filter disk and renewing filter cloths frequently are solved.
     1991年投产的 1.5万 t P2 O5/ a装置 ,经采用高温快速萃取技术与 78m2 转台过滤机 ,并通过实践摸索过程 ,采取若干技术措施 ,解决了滤盘结块 ,滤布需频繁更换等问题。
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     Study of Some Technical Problems of Multi-Port Memory of Vector Computer
     向量计算机多端存储器若干技术问题的研究
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     Discussions on Some Technical Problems in Cement Concrete Pavement
     水泥混凝土路面若干技术问题的讨论
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     Study on Some Technical Problems in Alignment of Ship Propulsion Shafting
     船舶推进轴系校中若干技术问题研究
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     Discussion on Some Technical Problem of UOE Pipe Production Line To Be Build by Bao Steel
     关于宝钢建设UOE钢管生产线若干技术问题探讨
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  各种技术
     It is mainly focused on some technical difficulties in developing a subsystem of recognizing isolated word based on MPU, which implies the technology of speech recognition to 3D fish mimicking.
     本文以教研室的《基于鱼类生物模型的计算机动画》项目为背景,分析解决了在研发过程中遇到的各种技术难点,并设计了一个基于嵌入式小词汇量语音识别系统。
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     On the basis of comparison between normal and abnormal combustion processes, the characteristics, impair and causes of appearing of above three kinds of abnormal combustion are analyzed in more detail, some technical measures for preventing abnormal combustion are introduced.
     在对正常发射过程与异常燃烧过程进行比较的基础上,深入分析了各种异常燃烧现象的特征、危害及产生的原因,并介绍了防止异常燃烧的各种技术途径。
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     We concisely introduce VPN first, and then analyze some technical schemes of VPN.
     对 VPN作简要介绍后,着重分析了实现 VPN的各种技术方案。
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     Marine main engine's selection is affected by some technical and economical factors .
     船舶主机选型需考虑各种技术与经济因素 .
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     Some Technical Problems on Fluoride Opal Glass
     氟化物乳浊玻璃的若干工艺问题
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     SOME TECHNICAL PROBLEMS IN USING OXYGEN ELECTRODE
     氧电极方法操作中的一些技术问题
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     Some Technical Problems of Rheocasting Process
     流变铸造中的几个问题
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     Some Technical Problems on Foundation of Large Equipments in Designing and Construction
     大型设备基础设计施工中的几个技术问题
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     SOME TECHNICAL PROBLEMS IN DETERMINATION OF INTERFACIAL TENSION FOR CAUSTIC FLOODING STUDIES
     碱水驱油研究中测定界面张力要注意的问题
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  some technical
Some technical tips are described on how to improve the discrimination between perfect and imperfect duplexes formed by hybridization of fluorescently labeled oligonucleotides to biological microchips.
      
In addition, some methods employed in the field as well as some technical problems are discussed in the paper, together with the means of obviating them.
      
These apparatuses combine the merits of plug-flow tubular reactors and stirred continuous reactors and have some technical and technological advantages.
      
Some technical and technological aspects of development, design, and safe operation of an artificial tritium source with an antineutrino activity of 40 MCi for experiments to measure the neutrino magnetic momentum are considered.
      
Some technical details in the procedure for calculating the critical distance Rcr in the relativistic problem of two Coulomb centers are described.
      
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In this paper we briefly review the existing types of large radio telescopes and sug- gest certain principles to be considered in future design.With these in mind,a new type of telescopes is proposed.This consists of a large central paraboloid and a number of outer rings of discrete antenna elements. Fig.1 shows the arrangement of the paraboloid and one ring.When the two are connected by “correlation technique”,the resulting radiation pattern will be D∞F_1F_2, where F_1,F_2 are the field patterns of the paraboloid...

In this paper we briefly review the existing types of large radio telescopes and sug- gest certain principles to be considered in future design.With these in mind,a new type of telescopes is proposed.This consists of a large central paraboloid and a number of outer rings of discrete antenna elements. Fig.1 shows the arrangement of the paraboloid and one ring.When the two are connected by “correlation technique”,the resulting radiation pattern will be D∞F_1F_2, where F_1,F_2 are the field patterns of the paraboloid and the ring respectively.By suitably chosing the radius of the paraboloid R_0,the radius of the ring α,and the number of elements in the ring n (R_0 and a being expressed in unit of the working wavelength), one may neglect the influence of the “secondary patterns” in F_2 (which occurs because the aperture of the ring is not full,but discrete).The Fourier transform of D∞F_1F_2 will then be expressed by equation (22) and shown in Fig.3,in which we take the radia- tion pattern of the paraboloid to be represented by Λ_2~2 (2πR_0r). When there are N rings with radii α_1=β_1R_0,α_2=β_2R_0,……,α_N=β_NR_0,and when they are connected with the central paraboloid by “correlation technique”,the radiation pattern will be D(r)=C_0[Λ_2(2πR_0r)]~2+CΛ_2(2πR_0r)[A_1J_0(2πα_1r)+A_2J_0(2πα_2r)+ +……+A_NJ_0(2παNr)],(26) where C_0,C,A_0…A_N are constants.The transform of D(r) is then expressed by equa- tions (37),(23),and (27),and may be adjusted to the form as shown in Fig.5.We see from the figure that the curve has nonzero values between the zero spatial frequency and the high frequency cut-off.Hence by the principle of “convolution correction” as pointed out by Wild in [11],the pattern may be “transformed” into a desirable one when a correcting function G is applied. To obtain such a curve as in Fig.5,that is,a curve with nonzero values below cut-off,one may choose the parameters β_m=α_m/R_0(m=1,2,…,N) so that the individual Fourier transforms corresponding to the paraboloid and successive rings will overlap in certain spatial frequency ranges.With this condition and the consideration of economy of arrangement,we may determine β_m and hence n_m [eq.(30)]. Table 1 gives the values of β and n as required in such design.In the sixth column of the table,we also give the half-power beam widths of the resulting patterns when they are corrected to Λ_1~2 (2πR_1r),where R_1=(β_N+1)R_0/2 (unit:R_0/2 minute of arc). For the sake of illustration,we take the total number of the rings N as 6.Denote the Fourier transform of radiation pattern D by (?),which curve is sketched in Fig.5. In the figure,the amplitude of (?) being modified to conform with the curve (?)_1~2 in order to suppress secondary lobes.The reverse transform of (?) is shown in Fig.6,which is the resulting radiation pattern.From it we see that the half-power beam width is about (200/R_0)′,the secondary lobe is tolerable,but rather broad. For correcting the pattern to Λ_1~2 (Fig.9),one has to find the correcting function G. As was done by Wild in [11],we have calculated the functions (?)=(?) and G in the case of zenith distance z=0.(Figs.7 and 8) Such calculations may be extended to other zenith distances,but the mathematics will be much more tedious. This type of radio telescope has the following essential characters: (1)It may be looked upon as the extension of a large paraboloid in the sense of improving the resolution and the collecting area.The field of application is wider than most of the usual types of large radio telescopes. (2)The system of antennas is good for wide range of wavelength variation. (3)At any stage,it always permits further developement by addition of outer rings. (4)It is advantageous to have the central paraboloid as large as practicable,since the resolving power is proportional to the factor (β_N+1)R_0.For given β_N,the total num- ber of elements required in the rings is the same for any R_0. (5)Away from the zenith,while the resolution in horizontal direction remains the same,that in vertical direction gradually deteriorates with the ihcrease of zenith distance. For N=6,the main lobe expands 1.8 times at z=60°,and 3.2 times at z=75°. (6)Beam swinging and scanning present some technical difficulties Owing to the path differences between different elements being functions of both azimuth and eleva- tion. (7)The “convolution corrections” of the radiation pattern are different for dif- ferent zenith distances.

本文从讨论现有各种大型射电望远镜系统出发,根据技术条件和研究工作的发展趋势,提出在设计中应当考虑的因素.按照这些考虑,提出了由一个中央大型抛物面天线和多个环状分布分立天线组合而成的系统,导出这种组合的设计公式,并以环的数目 N=6为例,计算了具体的天线方向图形空间谱,并算出为了调整方向图形所需的改正曲线,以及通过两种改正方法所得到的图形.这种系统有着多用途的特点.同时它可以适用于很宽的波长范围,而且通过增加环数可以得到不断的发展.文中讨论了这些特点,提出了一些问题,并且对实现这种方案的技术条件作了简要的叙述.

There are some technical problems in the synthsis of M.N.A.: (1) The end-point of reaction: the heat of reaction is utilized forthe indicating-scale. (2) Making the product either liquid or semi-solid, The presence oftrace solvent in the M.N.A. product is the main factor, the liquid or ?emi-solid form depends on the sweeping with or without nitrogen(orair). (3) The colour of product depends on the temp. of vaccum distil-lation: If the temp. is over 100℃, it turns to yellow, and above 130℃the colour will...

There are some technical problems in the synthsis of M.N.A.: (1) The end-point of reaction: the heat of reaction is utilized forthe indicating-scale. (2) Making the product either liquid or semi-solid, The presence oftrace solvent in the M.N.A. product is the main factor, the liquid or ?emi-solid form depends on the sweeping with or without nitrogen(orair). (3) The colour of product depends on the temp. of vaccum distil-lation: If the temp. is over 100℃, it turns to yellow, and above 130℃the colour will become brown. Because of trace methyl-cyclopenta-diene(dimer) in the heating, it turns to brown resin by acidic catalysis.

本文阐述并解决了合成M、N、A、液体酸酐固化剂中一些工艺技术上的问题。(1)反应的终点:利用反应热,以反应温度的上升作指标来控制。(2)使产品为液态或半固态:M、N、A、产品中的微量溶剂是决定产品液态或半固态的主要因素,在减压蒸馏中用与不用氮气(或空气吹扫)是决定产品为液态或半固态的关键。(3)产品的颜色决定于减压蒸馏的温度,如超过100℃则产品变黄,超过130℃则变为棕色。乃因产品中微量甲基环戈二烯(二聚体)在加热中受酸催化作用变为棕色树脂状物,

In this paper, attempts were made to highlight some of the basic experiences in both technical as well as economic progresses in their courses of agricultural modernization in the advanced industrialised countries and to put forth the national targets for agricultural modernization in the PRC. Rudimental situations and constraints in labour force, capital, energy source, technological level and time requirement between the advanced industrialised countries and the PRC were compared and the possible orientation...

In this paper, attempts were made to highlight some of the basic experiences in both technical as well as economic progresses in their courses of agricultural modernization in the advanced industrialised countries and to put forth the national targets for agricultural modernization in the PRC. Rudimental situations and constraints in labour force, capital, energy source, technological level and time requirement between the advanced industrialised countries and the PRC were compared and the possible orientation and some technical and economic policies for the Chinese agricultural modernization/mechanization in the PRC were formulated for further discussion and reference. In the mean time, characferistics of various models of agricultural modernization/mechanization were tabulafed and their differences stressed.

本文试图总结工业先进国家实现农业现代化在技术发展上和经济发展上的根本经验,拟定国家目标,对比基本条件和在劳力、资金、能源、技术、时间方面的不同约束,提出我国农业现代化机械化的途径商榷以及技术经济模型特征,抛砖引玉。

 
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