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彗星     
相关语句
  comet
     Among the rest groups,the ratio of comet cells,the length of DNA migration in peripheral blood cell and the ratio of micronucleus in mice bone marrow in 400 mg/kg group were 45.5%,(37.24±3.17)μm and 12.0‰ respectively and were significantly higher than that of the negative control and 50 mg/kg group(P<0.01).
     其中,400 mg/kg剂量组彗星细胞率、平均尾长、微核率分别为45.5%,(37.24±3.17)μm,12.0‰,显著高于阴性对照组和50 mg/kg剂量组(P<0.01)。
短句来源
     DNA Damage of Human Umbilical Vein Endothelial Cells Caused by Formaldehyde and H_2O_2 with Comet Assay and K-SDS Assay
     彗星电泳法和K-SDS法检测甲醛和H_2O_2对人脐静脉内皮细胞DNA的损伤
短句来源
     Results The comet length was46.27μm in exposure group,which was significantly higher than that of control group(26.78μm,P<0.01).
     结果暴露组平均彗星长度为46.27μm,明显高于对照组(26.78μm),差异有显著性(P<0.01)。
短句来源
     Two cases were unremission that showed apoptotic comet rate 3.0 %、 5.5 %, MBDI 1.1 %、 1.6 % respectively.
     “凋亡彗星”百分率为 3.0 %和 5 .5 %、MBDI为 1.1%和 1.6 %的 2例患者临床未缓解。
短句来源
     The comet percentage of mononuclear cells in peripheral blood and the content of MDA in blood plasma from patients were (21.2±4.2)% and (8.25±1.37) μmol/L, which were significantly higher than those from the controls (8.9±3.7)% and (4.46±0.93) μmol/L respectively ( P<0.01);
     试验组外周血单个核细胞彗星率及血浆MDA含量为 (2 1 2± 4 2 ) %和 (8 2 5± 1 37) μmol/L ,分别高于对照组的 (8 9± 3 7) %和(4 4 6± 0 93) μmol/L(P均 <0 0 1) ;
短句来源
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  comets
     Great Comets Hale-Bopp and Hyakutake areComing
     大彗星Hale-Bopp和Hyakutake来了
短句来源
     ORBITS OF THE COMETS TSUCHINSHAN 1 (1965b) AND TSUCHINSHAN 2 (1965c)
     彗星紫金山1(1965b)和紫金山2(1965c)的轨道
短句来源
     (2) some comets.
     (2)发现若干彗星
短句来源
     EVOLUTION OF THE ORBITS OF COMETS TSUCHINSHAN 1 AND TSUCHINSHAN 2
     彗星紫金山1和紫金山2的轨道演变
短句来源
     Methods Chlorfenapyr was administrated to mice once by gavage with 4.9, 9.8, 19.6 mg/kg doses, then the percentage of cells with comets and the DNA migration of the three kinds of cells were detected by comet assay.
     方法溴虫腈按4.9、9.8、19.6mg/kg三个剂量,一次性灌胃染毒小鼠,24 h后用彗星试验检测3种细胞的拖尾率和DNA迁移距离。
短句来源
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  cometary
     Future Development in Cometary Physics: Highlights of the IAU Colloquium 168(Nanjing, May 18~22, 1998)
     从IAU168学术讨论会看彗星物理未来发展(1998年5月18~22日,南京)
短句来源
     Identification of Cometary Records in Ancient China
     中国古代彗星记录的证认
短句来源
     CHARGE FLUCTUATION AND ELECTROSTATIC WAVES OF DUST PLASMA IN COMETARY ENVIRONMENT
     彗星环境中尘埃等离子体的电荷涨落和静电波动
短句来源
     23,1996. During the period from Feb. 8,1997 to May 1,1997,Hale-Bopp had many layers of shell in cometary head.
     在1997年2月8日至5月1日期间,Hale-Bopp彗星彗头内存在大量壳层结构。
短句来源
     Hale-Bopp showed that one event of outburst occurred on Sep. 24, 1996, and a jet appeared in the plate of Sep. 23, 1996. During the period from Feb. 8, 1997 to May 1, 1997, Hale-Bopp had many shells in cometary head.
     发现 :Hale -Bopp彗星在 1996年 9月 2 4日的一次爆发 ,1996年 10月 2 6日和 11月 13日的两次可能爆发。 在 1996年 9月 2 3日的底片上 ,Hale -Bopp呈现巨大的喷流。
短句来源
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  s comets
     Space Era's Comets (Ⅰ)
     航天时代的彗星(Ⅰ)
短句来源
     Space Era's Comets (Ⅱ)
     航天时代的彗星(Ⅱ)
短句来源

 

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      comet
    Computational and Theoretical Studies of Mass-Spectrometric Measurements of the Composition of Dust Particles of the Comet Halle
          
    In the calculations we used data similar to those for the collision of the Shoemaker-Levy 9 comet with Jupiter.
          
    The number of DNA breaks increased significantly beginning from day 120 of the experiment, as shown by the DNA-comet method.
          
    An analysis of the same images showed that their explanation requires a frequency of comet collisions with the Earth as high as 20 events a minute! This sensational hypothesis evoked a heated scientific debate.
          
    Motion of Dust Structures in the Circumnuclear Region of Comet Hale-Bopp and Rotation of the Cometary Nucleus
          
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      comets
    Evaluation of Light Flashes Caused by Impacts of Small Comets on the Surface of the Moon
          
    These "atmospheric holes" were interpreted by the American physicist Frank as concentrations of water vapor formed as a result of the disintegration and vaporization of so-called small comets at high altitudes.
          
    The paper below contains an analysis of the possibility of observing Frank's hypothetical comets during their collisions with the Moon.
          
    The First International Conference "Comets, Asteroids, Meteors, Meteorites, Astroblemes, and Craters (CAMMAC-1)"
          
    Light Curves of Selected Comets: Photometric Parameters and Flares
          
    更多          
      cometary
    Light Scattering by Aggregate Particles Comparable in Size to Wavelength: Application to Cometary Dust
          
    Many naturally occurring particles (including, most likely, cometary dust) have an aggregate structure.
          
    Motion of Dust Structures in the Circumnuclear Region of Comet Hale-Bopp and Rotation of the Cometary Nucleus
          
    Based on our measurements of the radial expansion of dust structures, we determined the velocities, 0.61-1.99 km s-1; accelerations, from -18.3 × 10-3 to 4.0 × 10-3 m s-2; and rotation period of the cometary nucleus, 111.41h ± 0.05h.
          
    In this paper, we compare the physical properties of EAAs and MBAs (and, partly, cometary nuclei) in an effort to gain an understanding of whether the physical properties of EAAs can tell us anything about their origins.
          
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      其他


    Le spectre de I'ammoniac a ét éutilisé pour rechercher les raies des spsctres de comètes que l'on peut attribuer aux molécules formées d'azote et d'hydrogène,NH_2 en particulier.On obtient une identification bien plus complète de ces spectres à partir du spectre de I'ammoniac obtenu sous une faible pression avec une faible excitation qu'àpartir des autres spectres de l'ammoniac. En étudiant le comportement des taies identifiées dans les différents spectres de comètes,ces spectres peuvent à leur tour être utilisés...

    Le spectre de I'ammoniac a ét éutilisé pour rechercher les raies des spsctres de comètes que l'on peut attribuer aux molécules formées d'azote et d'hydrogène,NH_2 en particulier.On obtient une identification bien plus complète de ces spectres à partir du spectre de I'ammoniac obtenu sous une faible pression avec une faible excitation qu'àpartir des autres spectres de l'ammoniac. En étudiant le comportement des taies identifiées dans les différents spectres de comètes,ces spectres peuvent à leur tour être utilisés pour poursuivre le firàctfonne- ment du spectre de l'ammoniac,fractionnement obtenu à partir des spectres de laboratoire. Le groupement des raies que l'on obtient de la sorte fait ressortir la structure des bandes de NH_2 présentes dans le spectre de l'ammoniac;il fair apparaitre en outre un dédoublement de certaines de ces bandes,dédoublement que l'on n'observe pas au laboratoire.

    我们使用氨的光谱来研究彗星光谱的谱线,这些谱线的成因是氮与氢所构成的分子,特别是 NH_2。我们从低压下,轻微激发所得的氨光谱,比较从别的氨光谱,能更完全地证认彗星的光谱。从彗星各种光谱里所证认出的谱线的情观的研究,得知这些光谱更可利用来研究氨的光谱的细节。由我们所得的谱线的分群表现氨光谱的 NH_2光带的结构;有些彗星的光带还分裂为二,这种分裂现象是在实验室里所观测不到的。

    These two comets were discovered on plates taken for photographic observation of asteroids during the first decade of January 1965. The instrument used is a double astrograph, with aperture 40 cm and focal length 300 cm. With eight observations of each comet made since the discovery up to March 4, 1965, orbits were computed and improved. The orbital elements as well as the difference between the observed and computed positions are given in Tables 1 and 2. As the angles of inclination of the planes of these orbits...

    These two comets were discovered on plates taken for photographic observation of asteroids during the first decade of January 1965. The instrument used is a double astrograph, with aperture 40 cm and focal length 300 cm. With eight observations of each comet made since the discovery up to March 4, 1965, orbits were computed and improved. The orbital elements as well as the difference between the observed and computed positions are given in Tables 1 and 2. As the angles of inclination of the planes of these orbits to the ecliptic are rather small, these orbits have been plotted on the plane of the ecliptic in the accompanying figure together with those of Jupiter and the earth. Regarding these cometary orbits, the following facts are worthy of special notice: 1. Both are short-period comets with nearly equal periods (6.6—6.8 years). 2. Their inclinations to the ecliptic are small (less than 11°). The lines of nodes of these cometary orbits and that of Jupiter are nearly collinear (within 11°). 3. Their perihelion points are within 8°of each other. 4. Their aphelion points are just a little outside of Jupiter's orbit. At the end of 1960, comet Tsuchinshan 1 had a close approach to Jupiter (about 0.17 A.U.). Comet Tsuchinshan 2 came within 0.48 A.U. from Jupiter at the end of 1961.

    首先将这两颗彗星和它们轨道的一些特点,综合叙述如下: 1.它们是在1965年一月份前后只隔十天相继发现的; 2.它们都是短周期彗星,周期在6.6到6.8年之间; 3.它们轨道平面和黄道面的倾角都不大(小于11°)。两条交点线彼此接近(其间成11°的角),而且都与木星轨道平面和黄道面的交线接近(相差不到8°); 4.两彗星轨道的近日点几乎在同一方向(只差8°); 5.这两轨道的远日点,都只略为超出木星轨道一些。在1960年12月,彗星紫金山1与木星接近到0.17天文单位。在1961年12月,彗星紫金山2与木星接近到0.48天文单位。

    Comets Tsuchinshan 1 and Tsuchinshan 2 were first observed at Purple Mountain Observatory in the beginning of 1965 within a short interval of ten days.They have very similar orbits(Table 1,Table 2,Fig.1).By the end of 1971,these comets were recovered on their return to perihelion.Starting from these orbital elements, we tried to find out what changes have happened to these orbits during a time interval of several centuries; whether this supposed“twin comets”have any genea- ]ogical relationship between them....

    Comets Tsuchinshan 1 and Tsuchinshan 2 were first observed at Purple Mountain Observatory in the beginning of 1965 within a short interval of ten days.They have very similar orbits(Table 1,Table 2,Fig.1).By the end of 1971,these comets were recovered on their return to perihelion.Starting from these orbital elements, we tried to find out what changes have happened to these orbits during a time interval of several centuries; whether this supposed“twin comets”have any genea- ]ogical relationship between them. The method of numerical integration we used takes into consideration the pertur- bations of eight major planets from Venus to Pluto,the mass of Mercury being added to that of the Sun.The initial values of planetary coordinate and velocity for the epoch to=2430000.5 are adopted from Sehubart and Stumpff,while the data for the comets are taken from Table 1 and Table 2,adjusted to the new epoch by ad- ding the effect of perturbations.The equations of motion have thus been integrated for a period of about 500 years(1694—2195). We plot three average orbits of each comet,demonstrating the evolutionary ten- dency(Fig.2,Fig.3).We are inclined to conclude that the similarity between the orbits of these two comets at present is merely a chance phenomenon.They star- ted with quite different orbits.The perturbations due to Jupiter happened to re- duce the differences of the orbital elements until they manifest themselves as twin comets.But this evolutionary effect will later on work the other way and magnify the differences.Here we notice that a few centuries is long enough for cometary orbits to undergo considerable evolutionary variation.The perturbations from the major planets are the determining factor.

    彗星紫金山1和紫金山2是于1965年初相继被发现的,它们的轨道彼此间有不少相似之处.为了考查这一对似是“孪生的彗星”在动力演化过程中是否有什么关联,本文考虑了自金星至冥王星八大行星的摄动,计算研究了这两颗彗星大约500年期间(1694—2195)的轨道变化.计算结果表明:目前两者轨道的某些相似之处,只是在一定时期里的现象,它们是从原来大小颇不相同的轨道经木星摄动而演变的结果,以后也将有不同的变化.

     
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