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  f region
     AF2 locates in the E/F region, withligand-dependent transactivation function.
     AF2 具有雌激素依赖的转录激活功能,位于E/F 区。
短句来源
     IONOSPHERIC STRUCTURE IN LOWER F REGION
     电离层低F区结构(英文)
短句来源
     AF2 locates in the E/F region, with ligand-dependent transactivation function.
     AF2具有雌激素依赖的转录激活功能,位于E/F区
短句来源
     Vibrationally excited molecular nitrogen N * 2 plays an important role in the F region ionosphere by increasing the loss rate of the dominant ion O +, thereby reducing the electron concentration in the F region of the ionosphere.
     激发态氮分子N 2 在电离层F区中起着重要的作用 ,它使F区占主导地位的O+ 离子的损失率增大 ,从而使该区的电子浓度减少 .
短句来源
     It is shown that irregular electric fields can initiate the Rayleigh-Taylor instability in the bottomside F region and result in topside plasma bubbles.
     非均匀电场能在赤道电离层F区底部触发Rayleigh-Taylor不稳定性,导致等离子体泡形态。
短句来源
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  f-region
     LINEAR STUDY OF E×B DRIFT INSTABILITY IN THE F-REGION AT MID AND LOW LATITUDE
     中低纬F区E×B不稳定性的线性研究
短句来源
     With EISCAT (European Incoherent Scatter) radar observations during 1988~1999, the climatologic features of electron densities in the auroral ionospheric F-region have been investigated statistically and compared with the IRI-2001 model for different seasons at different phases of the solar cycle.
     利用1988~1999年欧洲非相干散射EISCAT(EuropeanIncoherentScatter)雷达观测数据,对不同太阳活动周相、不同季节的极光椭圆区电离层F区电子密度进行统计分析,研究其气候学特征,并与IRI 2 0 0 1模式比较.
短句来源
     STORM-TIME JOULE HEATING OF AURORAL THERMOSPHERE AND IONIZATION DEPLETION IN THE F-REGION ──EISCAT RADAR OBSERVATION
     暴时极光区热层大气焦耳加热与F区电离耗空的EISCAT雷达观测
短句来源
     A COMPARATIVE STUDY OF MAGNETIC STORM EFFECTS ON THE IONOSPHERE IN THE POLAR CAP AND AUROAL OVAL—F-REGION NEGATIVE STORM
     磁暴期间极光椭圆与极盖区电离层效应比较研究——F区负暴
短句来源
     Making use of the relationships and the simultaneous measurements of electron densityand field-aligned ion Velocity, an inversion method is developed under the assumptions of a negligible electric field perpendicular to the geomagnetic field and some others to determine the propagation parameters of GW's inducing TID's in the higher F-region (above about 250km).
     应用这种关系,发展了一种在垂直于地磁场的电场可以忽略等简化假设下,由电子密度和离子沿场速度的同时测量数据,反演求解较高(约250km以上)F区中引起TID的重力波传播参数的方法.
短句来源
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  area f
     Area F for commerce of Jiaming
     嘉铭F区商业
短句来源
     Area F of Jiamingyuan Residential Quarter
     嘉铭园F区
短句来源
     office building in Area F of Jiaming Residential Quarters
     嘉铭F区办公楼
短句来源
  f block
     COMPLEXES STUDY OF f BLOCK ELEMENTS-HYDROXYPYRIDINONE SYSTEMS Ⅱ.SYNTHESIS AND CHARACTERIZATION OF Gd(Ⅲ), Th(Ⅳ) COMPLEXES OF HYDROXY-PYRIDINONE SYSTEMS
     f区元素-羟基吡啶酮体系的配合物研究——Ⅱ.钆(Ⅲ)、钍(Ⅳ)-羟基吡啶酮配合物的合成和性质研究
短句来源

 

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      f region
    New data of the authors are presented on phylogeny of Hypnales pleurocarpous mosses inferred from nucleotide sequence data of the nuclear DNA internal transcribed spacers ITS1-2 and the trnL-F region of the chloroplast genome.
          
    It is shown that the response of the lower ionosphere to the IGW propagation should be less efficient than the action of the IGW on the ionospheric F region.
          
    A DNA sequence from the 9F region of Drosophila melanogasterpolytene chromosomes was cloned.
          
    The data of TEC measurements at ground-based GPS receivers located near the ionospheric stations and the corresponding values of the critical frequency of the ionospheric F region (foF2) were used for this purpose.
          
    However, this region probably becomes more extensive in vertical when the electron density disturbance in the vicinity of the ionospheric F region is about 85%.
          
    更多          
      f-region
    Modeling the Modification of the Nighttime High-Latitude F-Region by Powerful HF Radiowaves
          
    A mathematical model of the high-latitude F-region, taking the ionospheric plasma convection into account, is used for modeling a response of the auroral F-region to irradiation by powerful high-frequency (HF) radiowaves.
          
    The elevation angle of the disturbance wave vector varies from 25° to 65°, and the phase velocity (900-1200 m/s) approaches the speed of sound at heights of the ionospheric F-region maximum.
          
    Spatial-Temporal Characteristics of Large Scale Disturbances of Electron Density Observed in the Ionospheric F-Region before Str
          
    The spatial dimensions and temporal dynamics of large scale disturbances of electron density in the ionospheric F-region during the preparatory phase of destructive earthquakes are estimated.
          
    更多          
      area f
    Comparison of the EEG spectrum powers at relaxation versus training periods in one BFB session revealed significant changes in the left parasagittal frontoparietal area (F3, Fz, C3, C4, P3).
          
    It is shown that the bulk diffusion of oxygen vacancies at the interface at 950°C is high enough to use the whole La0.75Sr0.2MnO3/YSZ contact area F for the oxygen transport into the electrolyte for microstructures with 2F/TPBL ≤ 2 μm.
          
    The first concerns the movement representation in the macaque inferior area 6, the second the functional properties of neurons located in the caudal part of this area (histochemical area F4).
          
    It is argued that the receptive field arrangement and the response properties are more complex in area F4 than in the primary motor cortex and that area F4 neurons are involved in the control of arm movements towards different space sectors.
          
    Visual neurons were more difficult to trigger than the corresponding neurons located in the caudal part of inferior area 6 (area F4).
          
    更多          
      f block
    A grooved area within the Kel-F block held ;200 mL of sample solution exposed to the electrodes.
          
    Be able to compare and contrast the physical and chemical properties of f block metal ions and compounds with those of the d-block and s-block.
          
    Of course, the F block had four inputs and four outputs.
          
    The F block had 20 arctangent hidden units, 10 of which were connected to each of the block's output units.
          
    The sample cell electrodes were made of two polished stainless steel plates and held in place with Teflon screws spaced with a Kel-F block 1-mm thick.
          


    In this paper, results of the TEC measurement by 136 MHz beacon of BTS-Ⅱ during the solar eclipse of Feb. 16, 1980 at He-qing station (100°12"E, 26°35'N) are discussed. The eclipse produces a premature sunset without any bite-out on the TEC curve during the course of the eclipse. However, it is indicated by the non-linear relationship between TEC and NB (the underlying electron content below F2-layer peak) that NB makes relatively less contribution to the measured Faraday rotation around the eclipse maximum....

    In this paper, results of the TEC measurement by 136 MHz beacon of BTS-Ⅱ during the solar eclipse of Feb. 16, 1980 at He-qing station (100°12"E, 26°35'N) are discussed. The eclipse produces a premature sunset without any bite-out on the TEC curve during the course of the eclipse. However, it is indicated by the non-linear relationship between TEC and NB (the underlying electron content below F2-layer peak) that NB makes relatively less contribution to the measured Faraday rotation around the eclipse maximum. These results imply that for a near sunset eclipse, its dynamic effect on the ionosphere is very marked and its photo-chemical effect is restricted in the lower ionosphere. No gravity wave can be associated immediatly with the eclipse, though quasi-periodic disturbances of very small amplitude can be seen on the residual curve of TEC after the running mean has been removed.

    本文介绍了1980年2月16日日全食时,在云南鹤庆县(100°12′E,26°35′N),测量日本ETS-Ⅱ同步卫星136MHz信标法拉弟旋转所得到的一些主要观测结果:(1)电子总含量的日变曲线中出现提前日落现象;(2)F区峰下电离对法拉弟旋转的贡献在日食期间相对变小;(3)没有出现与日食明显有关的声重波扰动。

    The authors nave analysed esterase isoenzyme of Erylhroculter dabryi and Cutter erythropterus and their morphological Chybrids by the technique of vertical] gel electrophoresis. The esterase isoenzyme patterns in liver and eye tisaues of the parents are made up of two zones. But the mobilities of these two zones in E. dabryi are slightly greater than those in C. crythropterus, So that the two species can distinguished.The patterns of esterase isozymes iu some morphological hybrids show accumulations of parental...

    The authors nave analysed esterase isoenzyme of Erylhroculter dabryi and Cutter erythropterus and their morphological Chybrids by the technique of vertical] gel electrophoresis. The esterase isoenzyme patterns in liver and eye tisaues of the parents are made up of two zones. But the mobilities of these two zones in E. dabryi are slightly greater than those in C. crythropterus, So that the two species can distinguished.The patterns of esterase isozymes iu some morphological hybrids show accumulations of parental phenotypes. They are also identical with the patterns in the artificial F1 hybrids. Based upou above genetic analysis of esterase isoenzyme, we suggest that these morphological hybri-dsare undoubtedly of natural F1 hybrids betweeu IT. dabryi and C. erythro-pterus. Besides, there are four types ampng other morphological hybrids. Along wdth their bladder fo ms, the esterase isozymic patterns vary regularily. Loss of the genetic integrity of parental species results from the F1 hybridscrossing back with one parent. In addition, genetic introgr-eeion between E. dahryi and C. crythropterus in Da-huofang Reservoir has been discussed.

    鉴于辽宁省大伙房水库部分红鲍鱼的形态特征介乎青梢红鲍和红鳍鲍之间,我们采用形态学和酯酶同工酶电泳等方法对它们进行了鉴定。 试验结果表明,两纯种的眼睛和肝胰脏同工酶电泳图谱有种的特异性。青梢红鲍的EST-S和EST-F区带向阳极移动速度分别较红鲍的为快。形态学介乎双亲之间的杂种酶谱与人工杂交子一代相同,呈现双亲酶谱的累加,从而证实这种中间型个体为青梢红鲍和人工杂交子一代。中间型个体和青梢红鲍人工回交实验证实后代是可育的。其它类型的形态学杂种的酯酶同工酶图谱随第三鳔室的形态及腹棱长度而有规律地变化,双亲遗传学完整性丧失的酶谱是F_1代杂种参加繁殖的结果。作者还讨论了大伙房水库这两种鱼的基因渐渗现象。

    The relationship between two sets of f-orbitals is explained.Via models of our own and literature diagrams,rarious applications of these f-orbital sets in orbital hybridizations and molecular orbital formations as well as their splittings in simple crystal field are described.Hence important infor- mations are provided for studies of lanthanide properties,including those of actinides and for the teaching of f-region elements.

    本文介绍了两组 f 轨道的关系及其在轨道杂化、分子轨道形成中的不同应用和在简单晶体场中的分裂情况,对于研究稀土元素(包括锕系元素)的性质及 f区元素的教学有重要的参考意义。

     
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