桂北376铀矿床烃气地球化学研究     

莫连 《地质与勘探》2023,59(5):1027-1042

烃气测量法在锡、金、铜、铅锌等金属矿床找矿中得到了广泛应用,而该技术在花岗岩型铀矿找矿中的应用鲜有报道。本文对桂北376铀矿床已知矿体开展了烃气测量试验,结果显示：相较于其他金属矿,该铀矿区花岗岩和土壤中总烃含量极低,而且花岗岩总烃含量(平均19.42μL/kg)高于上覆土壤(平均6.32μL/kg)。花岗岩中U与多数烃气组分呈负相关,与重烃呈正相关,重烃在U迁移过程中作用强于轻烃;花岗岩烃气标准化配分模式以C₁、iC₄和C₂^-正异常为特征;铀矿化程度与iC₄/nC₄、(C₁+iC₄+C₂^-)/(C₂+C₃+nC₄)及C₂^-/C₃^-比值呈正相关,与C₂₊/∑C比值呈负相关等可为寻找铀矿提供依据。3...  相似文献   

基于基础地理数据统计的长三角城市主城区空间格局扩展研究     

周墨  邓开艳  李雪艳  崔洪波 《测绘与空间地理信息》2015,(7):84-86

在快速城镇化时期,城市主城区的空间格局变化最为显著,以其复杂性和扩展性为突出特征。研究其扩展变化对认识城镇化、优化城市空间结构等具有重要意义。本文在基础地理数据统计的基础上,对长三角城市主城区2002~2012年的空间扩展进行了分析,探索影响其演变的若干因素。  相似文献   

Accumulation characteristics,mechanism, and identification of an ancient translational landslide in China   总被引：3，自引：2，他引：1  

Yong Zhao  Mo Xu  Jian Guo  Qiang Zhang  Hongmei Zhao  Xiaobing Kang  Qiang Xia 《Landslides》2015,12(6):1119-1130

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The abundance and radial distribution of satellite galaxies     

Frank C. van den Bosch  Xiaohu Yang  H. J. Mo  Peder Norberg 《Monthly notices of the Royal Astronomical Society》2005,356(4):1233-1248

Using detailed mock galaxy redshift surveys (MGRSs) we investigate the abundance and radial distribution of satellite galaxies. The mock surveys are constructed using large numerical simulations and the conditional luminosity function (CLF), and are compared against data from the Two Degree Field Galaxy Redshift Survey (2dFGRS). We use Monte Carlo Markov chains to explore the full posterior distribution of the CLF parameter space, and show that the average relation between light and mass is tightly constrained and in excellent agreement with our previous models and with that of Vale & Ostriker. The radial number density distribution of satellite galaxies in the 2dFGRS reveals a pronounced absence of satellites at small projected separations from their host galaxies. This is (at least partly) owing to the overlap and merging of galaxy images in the 2dFGRS parent catalogue. Owing to the resulting close-pair incompleteness we are unfortunately unable to put meaningful constraints on the radial distribution of satellite galaxies; the data are consistent with a radial number density distribution that follows that of the dark matter particles, but we cannot rule out alternatives with a constant number density core. Marginalizing over the full CLF parameter space, we show that in a ΛCDM concordance cosmology the observed abundances of host and satellite galaxies in the 2dFGRS indicate a power spectrum normalization of  σ₈≃ 0.7  . The same cosmology but with  σ₈= 0.9  is unable to match simultaneously the abundances of host and satellite galaxies. This confirms our previous conclusions based on the pairwise peculiar velocity dispersions and the group multiplicity function.  相似文献   

马氏珠母贝激光育苗的生物学机理     

莫秀珍  吕仕洪 《广东海洋大学学报》1995,(1)

对马氏珠母贝激光育苗的机理进行研究，结果表明：激光能加强精子活力，提高精液品质；影响卵子的通透性；抑制水中的细菌生长，使受精卵发育成健壮的胚胎、幼虫、幼苗。  相似文献   

Pre-heating by pre-virialization and its impact on galaxy formation     

H. J. Mo  Xiaohu Yang  Frank C. van den Bosch  Neal Katz 《Monthly notices of the Royal Astronomical Society》2005,363(4):1155-1166

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VARIATIONAL ITERATION SOLVING METHOD FOR SEA-AIR OSCILLATOR MODEL OF INTERDECADAL CLIMATE FLUCTUATIONS     

MO Jia-qi LIN Yi-hua WANG Hui 《中国地理科学(英文版)》2005,15(3):227-230

1IN T R O D U C T IO NInteractionsbetween the ocean and atmosphere con-tributeto climatefluctuationosver a broad spectrum oftime scales.Studiesof those interactionhsave farfo-cused on El Ni o-SouthernOscillation(ENSO)phe-nomenon thathas a period of3to4yea…  相似文献   

Coronal expansion and the transfer of solar angular momentum to the interplanetary space     

Li Zhong-yuan  Chen Zong-yi  Mo Guo-biao 《Chinese Astronomy and Astrophysics》1992,16(4):450-456

We discuss the question of loss of angular momentum through coronal expansion. From a large volume of data on Type-1 cometary tails we have confirmed the presence of a tangential component in the coronal expansion, which has not only a stochastic component but also a constant component of 9.8 km/s. Through coronal expansion the Sun has lost 80% of its angular momentum since it evolved on to the main sequence and the angular velocity of the Sun is decreasing exponentially. This result should have a large effect on the dynamical evolution of the Sun.  相似文献   

Aspherical accretion of cosmic strings     

H. J. Mo  B. Gao  L. Z. Fang 《Astrophysics and Space Science》1987,137(2):225-231

A simulation of accretion of a string loop has been done. It shows that aspherical accretion is essential for large-scale loops. All configurations found in the distribution of galaxies, such as filaments, pancakes, bubbles, and voids, can be formed by the accretion of cosmic strings.  相似文献   

Geochemical discriminations of sandstones from the Mohe Foreland basin,northeastern China: Tectonic setting and provenance   总被引：5，自引：0，他引：5  

Andrey A. Sorokin 《中国科学D辑(英文版)》2005,48(5):613-621

The Mohe region near the border area of China with Russia is in Heilongjiang Province. Topographically the area consists of lower mountains or hills situated at the northern end of the Da Hinggan Mountains. Struc-turally the Mohe basin rests on the north margin of the Ergun Block, and the Mongol-Okhotsk Orogen is lo-cated to the north of the basin. Due to poor access conditions and good vegetation coverage, previous researches on the basin are much weak with few spe-cial geological inves…  相似文献