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  composed of one
     The result of SDS-PAGE indicated that CspDZG1 and CspDZG2 are composed of one polypeptide with the molecular mass of 56kD and 54.5kD respectively.
     SDS-PAGE结果表明,CspDZG1 ,CspDZG2由一条多肽组成,分子量分别为56kD,54.5kD;
短句来源
     3 The result of SDS-PAGE indicated that CspDZG 1, CspDZG2 are composed of one peptide with the molecular mass of 56KD and 54.5KD, CspDZG3 is composed of two subunits with molecular mass as 54.5KD and 68KD.
     4.SDS-聚丙烯酰胺凝胶电泳结果表明,CspDZG1、CspDZG2由一条多肽组成,分子量分别为56KD,54.5KD; CspDZG3由两个亚基组成,分子量分别为54.5KD,68KD。
短句来源
     In this scheme, the CTM is mainly composed of one piece of XC2V500 FPGA and three pieces of K6F3216T6M SRAM, and it adopts 3-frame structure and parallel processing. Considering the limitation of the space condition where the system is placed, the scheme is a feasible way for the CTM in the spaceborne SAR system.
     方案主要部分由一片XC2V500FPGA和三片K6F3216T6MSRAM组成,采用三页式结构和输入输出并行处理方法,考虑了星上环境条件对器件的限制,可以实现星上SAR实时成像处理器的CTM系统。
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     MSCIS is composed of one communication computer and several I/O interface cards containers that connect through RS-485 or CAN bus.
     MSCIS接口系统由一台通信计算机和若干个接口机箱组成,通过RS-485或者CAN总线相连。
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     The image processor is composed of one digital signal processing (TMS320C6701) board and a real-time image input card.
     图像处理器的核心由一块TMS32 0C6 70 1数字信号处理板及图像实时采集卡构成 .
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  by first
     The proofs of the two orthogonal function systems formed by first order Bessel functions
     由一阶贝塞尔函数组成的两个正交系的证明
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     A derived differential equation of this model is equal to derived basic differential equation by first order theory in form.
     应用该模型导出的基本微分方程 ,在形式上与由一阶理论导得的方程无异 ,应用上特别简便。
短句来源
     By use of the differential and integral natures of first order Bessel functions, the proofs of the orthogonal nature about two linear function systems formed by first order Bessel functions have been given, and the calculating formula about the length of the orthogonal function system has been given too.
     利用贝塞尔函数的微分与积分性质,给出了两个由一阶贝塞尔函数组成的线性函数系的正交性的证明,并给出了其长度表达式。
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  “由一”译为未确定词的双语例句
     ON THE MATRIX LIE RING DEFINED BY A HAMILTONIAN OR SKEW-HAMILTONIAN MATRIX
     由一哈密尔顿矩阵或反哈密尔顿矩阵所定义的矩阵李环
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     Attractors for the Dynamical System Determined by a Class of Nonlinear Evolution Equations
     由一类非线性发展方程所确定的动力系统的吸引子
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     Primeness of the Ideal Generated by the One-Dimensional Wave Operator
     由一维波动算子生成的理想的素性
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     Simultaneous Determination of Cr(Ⅲ) and Cr(Ⅵ) in a Single Run by Catalytic Kinetic Method
     用催化动力学法由一次实验同时测定铬(Ⅲ)和铬(Ⅵ)
短句来源
     It is automatically controlled by an industrial micro-computer,with two sets of step motor controlled by a PCI special control MPC02 card with dual shafts;
     由工控微机自动控制,由一块两轴PCI专用控制卡MPC02控制两台步进电机;
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  composed of one
A semicrystalline structure composed of one amorphous block and three crystalline modifications was formed with different rates and different melting onset temperatures in unirradiated PE and in PE irradiated to a dose of 5.5 Mrad.
      
Spatially coherent radiation from a coaxial free-electron laser with a resonator composed of one-dimensional and two-dimensional
      
The calculated results using the comprehensive kinetic model composed of one to three independent and consecutive reactions, agreed well with experimental results.
      
A novel preamble is designed, which is composed of one regular OFDM training block with even numbers of identical parts and one irregular OFDM training block with odd numbers of identical parts.
      
Results indicated that while the HPLC separation was incomplete, one of the major HPLC peaks was primarily composed of one of the three main components typically separated by CZE.
      
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  by first
The density of states and band structure of 20 nm barium titanate (BaTiO3, BT) ceramics are investigated by first-principles calculation.
      
The enzyme inactivation was characterized quantitatively by first order rate constants, kin(s-1).
      
At the initial portions of kinetic curves, the reaction was described by first-order rate equations with respect to n-decane; the reaction was of fraction order with respect to CCl4and catalyst.
      
The experimental data on the dehydration of 2-propanol in supercritical water are adequately described by first-order reaction rate equations.
      
The process rate is characterized by first reaction order by active chlorine, provided molecules of hypochlorous acid can inhibit the process due to their reversible adsorption on the anode surface.
      
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The absorption wavemeter investigated consists of a single loop with a variable gap which is formed by a pair of parallel plates. A calibration formula for the meter was derived on the assumption that the stray capacity could be considered constant and the stray inductance negligible. This simple and useful formula was ex perimentally checked on four different meters, covering the range from about one-and-quarter meter to one-half meter. These melors were carefully constructed and accurately calibrated with...

The absorption wavemeter investigated consists of a single loop with a variable gap which is formed by a pair of parallel plates. A calibration formula for the meter was derived on the assumption that the stray capacity could be considered constant and the stray inductance negligible. This simple and useful formula was ex perimentally checked on four different meters, covering the range from about one-and-quarter meter to one-half meter. These melors were carefully constructed and accurately calibrated with reference to a quartz oscillator by the double-heating method through the use of an auxiliary oscillator of a continuous range of wave-lengths from six to ten meters.

在吸收式波长计之理论上,以其杂储电量为常数而略其杂磁感量,得一简便之公式虽在波长一公尺左右亦可用。所研究之吸收式波长计之构造,系一黄铜制成之单圈,用二黄铜片制成之一缝隙。其缝隙之宽度,可由一螺旋调节。此种波长计,曾 在国立中央研究院物理研究所制造室制造四具,可量波长一有四分之一公尺至半公尺亦曾在此研究所之实验室内,与水晶振荡器校准先制一振荡器,可在六至十公尺之间,发生无论任何波长之振荡。并将此振荡器与一水晶振荡器用拍谐法校准。再制一有四分之一公尺至半公尺之振荡器,与已与水晶校准之振荡器,再用拍谐法校准,而同时以所制之吸收式波长计量之其实验与理论所得之各结果极为符合。

With a view to synthesize a simple functional derivative of pentalene (Ⅰ) so as to testify Hückel's theory of aromaticity, the compound bicycle (3.3.0) octa-3, 7-dien-2, 6-dione (Ⅲ), (the enol form of which is 1, 4-dihydroxypentalene(Ⅱ)), was obtained.The key intermediate, bicyclo (3.3.0) octan-2, 6-dione (Ⅳ), was prepared through a new route with an overall yield of 19—36%: Hydrogen chloride was added to cyclopentadiene to form 3-chlorocyclopentene(b.p. 27—28°/11—12,n_p~(250) 1.4748; 85—92%), which was coupled...

With a view to synthesize a simple functional derivative of pentalene (Ⅰ) so as to testify Hückel's theory of aromaticity, the compound bicycle (3.3.0) octa-3, 7-dien-2, 6-dione (Ⅲ), (the enol form of which is 1, 4-dihydroxypentalene(Ⅱ)), was obtained.The key intermediate, bicyclo (3.3.0) octan-2, 6-dione (Ⅳ), was prepared through a new route with an overall yield of 19—36%: Hydrogen chloride was added to cyclopentadiene to form 3-chlorocyclopentene(b.p. 27—28°/11—12,n_p~(250) 1.4748; 85—92%), which was coupled by magnesium to 1,1'-bi-2-cyclopentenyl (V, b.p. 70°/18, n_p~(230) 1.4880; 80—92%). This diene (Ⅴ) was ozonized and the ozonide was decomposed with 40% peracetic acid to yield hexane-1, 3, 4,6-tetracar-boxylic acid (Ⅵ). The tetramethyl derivative (Ⅶ) of the acid (low melting crystals of a cis-trans mixture, b.p. 144—1.47°/0.07 mm; 66—75% overall yield from (Ⅴ)) was dicyclized by potassium t-butoxide to 3, 7-dicarbomethoxy-bicylo (8.8.0) octan-2,6-dione (Ⅷ, m.p. 90.4—92.4°, cis-trans mixture; 52—67% yield). Upon decarbomethoxylation, the latter (Ⅷ) yielded the dione (Ⅳ) (m. p. 45—45.5°; 79—84% yield) which was found to be identical with Ruzicka's product. Lithium aluminmn hydride reduction of the dione (Ⅳ) gave the corresponding diol (Ⅸ) (b. p. 106—106.5°/0.005, 65%), but the diol failed to form pure dienes in fair yield by Chugaev dehydration.The dione (Ⅳ) was chlorinated in acetic acid to dichlorobicyclooctandione (X, 64—74%), which was transformed into its corresponding diethyleneketal (Ⅺ) (separated into 3 forms: α-, m. p. >210° d.; β-, m. p. 126—127°; γ-, m. p. 100—101°; β- and γ- forms shown to be the 3, 7-dichloro derivatives. 52—65% yield). Potassium t-but-oxide dehydrochlorinated the dichloroketal (Ⅺ) to bicylo (8.8.0) octa-3, 7-dien-2, 6- dione diethyleneketal (Ⅻ, m. p. 99—100.5°; 69% yield), upon ketal-exchange of (Ⅻ) with excess acetone, the synthesis of the diendione (Ⅲ) (m. p. 75.5—76.5°, 76% yield) was accomplished. The structure of all the above mentioned compounds was established by analyses, chemical transformations and spectral data.The diendione (Ⅲ) does not contain any detectable amoumt of its enol form, 1, 4-dihydroxypentalene (Ⅱ), neithor can it be forced to form stable enolized forms. Thus it is believed that the pentalene system does not pessess aromatic character.

本文报告烯酮(Ⅲ)的合成,与(Ⅲ)相当的烯醇体即1,2-二羟二环辛四烯(Ⅱ)。合成的关键中間物,二酮(Ⅳ),由一新合成步驟制备,总产率19—36%:低温加氯化氫于环戊二烯得3-氯环戊烯(85—92%),再用鎂使之双合而成二烯(Ⅴ)(80—92%)。(Ⅴ)的臭氧化合物經过氧乙酸分解而形成四元酸(Ⅵ),酯化后得其四甲酯(Ⅶ)(由(Ⅴ)至(Ⅶ)总产率66—75%);后者可环化为二甲氧羰基二酮(Ⅷ)(52—67%),(Ⅷ)經水解脫羧即生成二酮(Ⅳ)(79—84%)。二酮(Ⅳ)可还元为二醇(Ⅸ)(65%)。由二酮(Ⅳ)再經四步反应后即得烯酮(Ⅲ):氯化二酮(Ⅳ)得二氯二酮(Ⅹ)(64—74%);將(Ⅹ)与乙二醇一同脫水縮合得縮二酮(Ⅺ)(52—66%);自(Ⅺ)脫氯化氫后得二烯縮二酮(Ⅻ)(69%),后者与丙酮經交換反应即变为烯酮(Ⅲ)(76%)。上述各化合物的分子結構,均經証明。烯酮(Ⅲ)不含其相当的烯醇体(Ⅱ);在鹼性溶液中亦不能形成稳定的二环幸四烯二醇-陰离子。因此可以相信,二环辛四烯体系具有芳族性的可能性極微。

The present article deals chiefly with the skillful utilization of gear trains in ancient China. The authors analyze chiefly three examples, all of who will be reconstructed for exhibition by the Historical Museum of China. The first example is the water-powered astronomical apparatus equipped with clock-work indicating the day of the month, which was invented by Chang Heng (张衡) in the Han dynasty, about 130 A. D. The second example is the same kind of apparatus invented by I-Hsing (一行) and Liang Ling-tsan(梁令瓒)...

The present article deals chiefly with the skillful utilization of gear trains in ancient China. The authors analyze chiefly three examples, all of who will be reconstructed for exhibition by the Historical Museum of China. The first example is the water-powered astronomical apparatus equipped with clock-work indicating the day of the month, which was invented by Chang Heng (张衡) in the Han dynasty, about 130 A. D. The second example is the same kind of apparatus invented by I-Hsing (一行) and Liang Ling-tsan(梁令瓒) in the T'ang dynasty, in the year 725 A.D. And the third example is the south-pointing carriage invented by Wu Te-jen (吴德仁) in the Sung dynasty in the year 1107 A.D. From the above examples, we see that the ancient Chinese scientists already knew the following principles: 1. by using a kind of gear train mechanism that is, by the combination of a number of toothed wheels with different number of teeth, they could obtain a regular and uniform reduction of rotary motion; 2. by using gear trains they could transmit motion from one driver to two or more different followers with different speeds and directions; 3. by putting in or taking out an idler (or an intermediate wheel) between two toothed wheels, they could make the follower connect or disconnect with the driver; 4. by putting in one or several intermediate wheels between the driver and the follower, they could easily change the direction of rotation of the follower and reduce the total space needed by the whole train; 5. by putting in one intermediate wheel between two toothed,wheels having the same number of teeth, they could get them to rotate with the same speed and direction. From all this, we can clearly see that, almost all the important principles relating to gear trains were discovered by our,ancient scientists.

本文主要叙述中国古代对于齿轮系的巧妙应用。详细地分析了三个实例,并将由中国历史博 物馆古代技术工作室把它们都复原出来,在中国历史博物馆里陈列。第一个实例是汉代张衡在公 元130年(永建五年)左右发明的水力天文仪器;第二个实例是唐代一行和梁令瓒在公元725年 (开元十三年)发明的水力天文仪器;第三个实例是宋代吴德仁在公元1107年(大观元年)发 明的指南车。 根据这三个实例,可以知道中国古代的科学家们早已掌握了下列有关齿轮系的原理:1、由 不同齿数的若干个齿轮组成一个齿轮系可以得到很规律的减速运动;2、由一个原动轮的迴 转运动,可以传达到两个,三个,甚至更多的从动轮,得到彼此不同速度不同方向的运动;3、 由一个中轮的嵌入或离开,可以任意使从动轮与原动轮联系或不联系;4、由嵌入中轮的作用, 可以任意变更从动轮迴转的方向并可大大缩小全机构所占的空间;5、两个齿数相同的齿轮,中 间嵌入一个中轮,可以使它们按同一速度和同一方向迴转等。 根据上边所说的一切,我们可以很清楚地看出,所有一般有关齿轮系的主要原理都早已被我 国古代科学家们发现了。

 
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