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neutral hydrogen
相关语句
  中性氢
     TIME EVOLUTION AND SPACE DISTRIBUTION OF THE NEUTRAL HYDROGEN AND LIGHT IMPURITIES IN HT-6 TOKAMAK
     HT-6装置中中性氢及轻杂质的时间-空间分布
短句来源
     ( 3 ) the content of the neutral hydrogen should be very little and ( 4 ) the chief component of the cosmic dust is silicate grains and the secoud component is graphite grains.
     (3)中性氢含量很少; (4)在宇宙中,尘埃的主要成份是硅酸盐粒子,碳微粒是第二组成部分。
短句来源
     Using the spectroscopic method, the temporal profile of the neutral hydrogen atom density, the influxes Γ0 of hydrogen atom, the particle confinement time τp and the recycling coefficient R are measured in the HL-1 tokamak.
     用光谱学方法测量了HL-1托卡马克等离子体中性氢原子密度n_0的时空分布,氢原子流入通量Г_0。
短句来源
  “neutral hydrogen”译为未确定词的双语例句
     DETERMINATION OF THE GALACTIC ROTATION PARAMETERS FROM CEPHEIDS AND 21CM EMISSION OF NEUTRAL HYDROGEN
     用造父变星和21厘米氢线发射探求银河系自转参数
短句来源
     THE ENERGY DISTRIBUTION OF NEUTRAL HYDROGEN ATOM AND MOLECULAR PROCESSES
     氢原子能量分布和分子过程
短句来源
     The results show,if the neutral hydrogen content is very low(that is,no lyman cut-off), the reradiatioh from dust must produce a temperature distortion 0.1-0.2K near the peak frequence of the 3K cosmic microwave background and does not depend on the dust models.
     结果表明,如果中性氢的含量很少,即星系前恒星的辐射谱无Lyman截止,尘埃的再辐射将使3K背景辐射在其峰值频率附近产生0.1K—0.2K的畸变,而与模型无关。
短句来源
     On otherwise, if neutral hydrogen content is very high, the refadiation from dust produces no effect on the 3K cosmic microwave background.
     反之,如果中性氢的含量很高,则尘埃的再辐射将不可能使3K宇宙微波背景谱产生畸变。
短句来源
     Using binary encounter approximation and Thomas Fermi approximation,charge stripping cross sections for hydrogen like ions Li 2+ and C 5+ by collision with neutral hydrogen and helium atoms are calculated.
     使用双撞近似(BEA)和托马斯-费米近似(TFA)计算了类氢离子Li2+和C5+与中性原子H和He碰撞的电荷剥离截面。
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  相似匹配句对
     THE ENERGY DISTRIBUTION OF NEUTRAL HYDROGEN ATOM AND MOLECULAR PROCESSES
     氢原子能量分布和分子过程
短句来源
     Hydrogen Energy
     氢能
短句来源
     hydrogen britteness
     氢脆
短句来源
     Determination of Nitrite by Hydrogen Peroxide -Neutral Red Kinetic Photometry
     新体系过氧化氢-中性红催化光度法测定亚硝酸根
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     Neutral doctrism
     中性主义
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  neutral hydrogen
A Pinhole Camera-Type Multichord Analyzer of Neutral Hydrogen Atoms
      
The design, operational principle, and results from the calibration of a multichord analyzer of neutral hydrogen atoms and their isotopes, based on the principle of a pinhole camera, is described.
      
Neutral hydrogen around the oxygen-sequence Wolf-Rayet star WR 102 and the nebula G2.4+1.4
      
The abundance of neutral hydrogen in the members of close groups was found to be, on average, a factor of 3 lower than that in isolated galaxies.
      
The ratios of the total (indicative) masses of the galaxies to their luminosities lie within the range 0.4-8.2 with a mean of 3.8 (M⊙/L⊙), and the mean mass fraction of neutral hydrogen is 13%.
      
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The process of the geomagnetic storm is studied by using the following qualitative model. The solar flare being taken as an explosion, the resulting corpuscular stream will propagate through the planetary space in the form of a shock wave, and penetrate into the magnetosphere through the neutral points. The ring current thus formed by the solar wind in the equator plane is responsible for the main phase of geomagnetic storm. By charge exchange of the protons with the neutral hydrogen atoms in the outersphere,...

The process of the geomagnetic storm is studied by using the following qualitative model. The solar flare being taken as an explosion, the resulting corpuscular stream will propagate through the planetary space in the form of a shock wave, and penetrate into the magnetosphere through the neutral points. The ring current thus formed by the solar wind in the equator plane is responsible for the main phase of geomagnetic storm. By charge exchange of the protons with the neutral hydrogen atoms in the outersphere, the total energy of the penetrated particles gradually decreases when the storm is in its recovery period. According to different travel times of 17h, 24h and 32h respectively of the shock wave, the storm-time magnetic variations on the earth surface are estimated which coincide with the observed facts.

本文通过下述模型来探讨典型的磁暴发生过程:当点爆炸球面波自太阳上爆发后,太阳微粒流随即以冲激波形式越过行星际空间到达地球,在地球附近可能形成驻激波面,然后微粒流由地磁空穴的中性点进入磁层,在地球周围生成电流环,产生磁暴主相。在质子与地球附近上空中性氢原子发生电荷交换的过程中,磁暴过程相应地由主相转入恢复期,在不考虑行星际空间磁場的条件下,计算出在太阳爆炸波发生后第17时、24时、32时开始的磁暴发展过程曲线,并由观测资料推测出中性点的等效面积,计算结果指出:爆炸波愈强,主相愈大,恢复期愈短,这和观测到的粒子流速度愈大,磁暴也愈强、恢复期也愈短的现象是一致的。

(i)Using 146 cepheids selected from the data listed by Kraft and Schmidt,the variation of Δω(R) with R is computed by means of Camm's method.Then,the re- sult is fitted to the curve of Δω(R) computed from the observational data of 21 cm emission of neutral hydrogen,obtained at Leiden.The value of R_0,the sun's distance from the galactic centre,is found to be 11.0 kpc. (ii)Using the proper motions of 17 cepheids (omitting W Gem) given by Blaauw and Morgan,the angular velocity of rotation ω(R_0) for the...

(i)Using 146 cepheids selected from the data listed by Kraft and Schmidt,the variation of Δω(R) with R is computed by means of Camm's method.Then,the re- sult is fitted to the curve of Δω(R) computed from the observational data of 21 cm emission of neutral hydrogen,obtained at Leiden.The value of R_0,the sun's distance from the galactic centre,is found to be 11.0 kpc. (ii)Using the proper motions of 17 cepheids (omitting W Gem) given by Blaauw and Morgan,the angular velocity of rotation ω(R_0) for the solar neighbourhood is com- puted.The resulting value is 23 km/sec/kpc.Therefore the linear rotational velocity V(R_0) is 250 km/sec. (iii)Making use of the curve of Δω(R),values of ω(R),V(R),F(R),A(R),and B(R) are calculated in the region from 5 to 14 kpc from the galactic centre.Lastly,a comparison is made between the values of V(R) computed and the results obtained from the dynamical theory of stable stellar systems.

(i)利用克拉夫特和施密特列出的造父变星资料中146个星的资料,用加姆方法计算了Δω(R)随 R 的变化.结果同根据莱顿天文台得到的21厘米氢线发射的观测资料计算出的Δω(R)镶合,定出太阳离银心的距离 R_0=11.0千秒差距.(ii)利用伯劳乌和摩根给出的17个造父变星(W Gem 除外)的自行资料,算得太阳邻近的银河系自转角速度ω(R_0)=23公里/秒/千秒差距,因而得自转速度 V(R_0)=250公里/秒.(iii)利用Δω(R)曲线计算了在R=5至14千秒差距区域内,ω(R)、V(R)、F(R)、A(R)和 B(R)的数值.最后,将 V(R)的数值同稳定星系动力学理论的结果作了比较.

According to the principle and procedures presented in ref. [4], we have identified and analyzed the absorption lines spectrum of QSO OQ172 (=PKS 1442+101, Zem = 3.543) obtained by Chen et al., and found such a redshift system as shown in Table 1.There are 9 lines in this system, and 5 of which are Lα-L∈ of neutral hydrogen with equivalent widths consistent with the astrophysical constrains. The rest four lines are SiⅡ1260.42, NⅡ 1083.99, OVⅠ 1031.94 and FeⅡ1144.95. Their identifications are not reliable...

According to the principle and procedures presented in ref. [4], we have identified and analyzed the absorption lines spectrum of QSO OQ172 (=PKS 1442+101, Zem = 3.543) obtained by Chen et al., and found such a redshift system as shown in Table 1.There are 9 lines in this system, and 5 of which are Lα-L∈ of neutral hydrogen with equivalent widths consistent with the astrophysical constrains. The rest four lines are SiⅡ1260.42, NⅡ 1083.99, OVⅠ 1031.94 and FeⅡ1144.95. Their identifications are not reliable owing to the lack of other strong components of each multiplet and likely resulted by chance (see ref. [6]).By using the method showed in refs. [4] and [6], the statistical test for the five hydrogen lines has been made. Counting the number of the experiments n (=2021) and taking n, B, μ and u defined by eqs. (2)-(7) (using the same symbols of refs. [4] and [6]), we obtained the u-value =9.748 which is much greater than u0≈1.645, the rejection region for the significant level α=0.05, and even greater than u0≈2.35 for α=0.0.1.The result for S=98.9, the signal-to-noise ratio for the redshift system in question, is much greater than S (≈3.5), the mean value of those for all candidate systems in OQ172's spectrum, see eq. (8).For the five lines Lα-L∈, we have adopted the curve of growth for a single Maxwell velocity distribution and deduced Doppler widths b=55Km S-1 and column density of hydrogen lgNH=14.66 on the assumption there is no broadening by damping. The values (if IgWλ/λ and Igfλ of these lines are listed in the last two columns of Table 1.Our conclusion are as follows: the redshift system with 2=3.35248 is a reliable pure-hydrogen one. It can not be caused by any galactic halo, which has more complex, chemical composition. The absorber we have detected should be a primitive hydrogen cloud. On the basis of the Friedmann cosmological model, put q0=0.5, we have got the age of this cloud to be 0.11 of the Hubble time, see eq. (9).

根据对类星体OQ172吸收线光谱的证认,可靠地确定了一个由氢线(L_a~L_b)支持的红移系统z=3.35248,分析表明它是一个大爆炸后形成的原始氢云。假定不存在阻尼加宽,用生长曲线求得其柱密度 lgN_H=14.66,多普勒宽度 b=55km/s。

 
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