豫北煤田焦作、鹤壁、安阳矿区二1煤层优势断裂构造地球化学特征   总被引：7，自引：0，他引：7  

蒋建平  罗国煜  康继武 《地球化学》2000,29(4):367-375

对豫北煤田焦作、鹤壁和安阳矿区二１煤层的对比样（构造煤和原生结构煤）进行了显微镜和扫描电镜下观察、镜质组反射率测试、Ｘ射线衍射分析和化学分析等。研究结果表明,构造煤因发生了断裂构造地球化学作用,其化学成分、元素成分和煤分子结构与原生结构煤明显不同：构造煤的挥发分含量（％）比原生结构煤一般要小０．５５～３．４８,平均要小１．５９;构造煤和原生结构煤相比,碳含量（％）平均增加了３．１,氢含量（％）平均  相似文献   

Small-scale clumping in molecular clouds     

T. L. Wilson  C. M. Walmsley 《Astronomy and Astrophysics Review》1989,1(2):141-176

Summary This review consists of five sections. In the introduction, we briefly review the development of the study of molecular clouds. In the second section, we review the theories of molecular cloud structure and compare these predictions with the statistical properties of the clouds. In Sect. 3 we give an overview of current approaches to determinations of mass and local density in clouds. In the fourth part, we discuss the observations of a selected sample of individual sources. The emphasis here is on high resolution studies of regions of star formation. The final section contains a discussion of instrumental limitations and mentions some future developments.  相似文献   

The density and magnetic field of the dense cores of the molecular cloud L 1630     

Xing-wu Zheng  Yong-feng Huang 《Chinese Astronomy and Astrophysics》1996,20(4):437-444

The density and magnetic field strength of the dense cores in the Orion B molecular cloud are derived from the observed radius and FWHM line width based on the model of a uniformly magnetic sphere. We obtain the average magnetic field strength of 110μG and the average density of 8 × 10⁴/cm³ for the 39 cores, which agree closely with the observations. The method for deriving the density and magnetic field strength is applicable to the cores with R>0.2pc.  相似文献   

DISCOVERY OF ORGANIC MOLECULES IN DEEP-SEA IRON COSMIC DUST     

彭汉昌  徐培苍 《中国海洋湖沼学报》1995,13(1):9-12

A great quartity of cosmic dust(spherules) was found in deep-sea sediments during May to July,1983manganese nodule investigations by the R/V“XIANGYANGHONG 16”in the area 7°-11°N,167°-178°Win the Pacific.Comprehensive study of the cosmic dust and determination with Laser Raman MolecularMicroprobe(LRMM) of the molecules in it showed that besides Fe-Fe,Fe~(3+)-O,Fe-Ni,Al-O,Fe-Obr-Si and Si-Onb,it also contained the organic molecules C-H-O and C-H-S-O,various no fixed form molecules of C,CH_2,CH_3 and volatile molecules CO_2,H_2O,OH~- and H_2S,etc…The study result has very important applications for exploring the origin of interplanetary dust parti-cles and life material.  相似文献   

Spectra of the ammonium radical: the schüler bands     

G. Herzberg 《Journal of Astrophysics and Astronomy》1984,5(2):131-138

The main bands of the Schüler system of ND₄ and NH₄ have been observed at high resolution. On the basis of these spectra, Watson, in a separate paper, has analysed the ND₄ main band showing that it represents a²F₂ → ² A₁ transition of a tetrahedral molecule. The observed wavenumber data for both ND₄ and NH₄ are presented; the latter have not yet been analysed. Isotopic bands for¹⁵ND₄,¹⁴ND₃H,¹⁴ND₂H₂,¹⁴NDH₃ have also been obtained and as previously pointed out confirm the assumed carrier of the spectrum. The much weaker bands accompanying the main Schüler band on the short and long wavelength sides are photographed at medium resolution. The interpretation of these bands in terms of the vibrational levels of upper and lower states is briefly discussed.  相似文献   

The 3.2–3.5 μm region revisited – II. A theoretical study of the effects of hydrogenation on some model PAHs     

F. Pauzat  Y. Ellinger 《Monthly notices of the Royal Astronomical Society》2001,324(2):355-366

In this second paper on the 3.2–3.5 μm region, we report the results of a theoretical study of the possible contributions of hydrogenated compounds to the observed infrared emission. We consider small aromatic species to which hydrogens have been added directly on the polycyclic frame, in both neutral and ionized forms, to mimic typical structural situations expected for larger polycyclic aromatic hydrocarbons (PAHs). The evolution of the infrared spectra for PAHs having increasingly higher excess H coverage is investigated up to saturation. The present study shows that hydrogenated PAHs produce series of bands that may be at the origin of the broad plateau observed below the 3.4- and 3.5-μm features, together with the features themselves. Ionization produces the usual collapse of the aromatic CH intensities, but it also affects the alicyclic CH intensities, although less drastically, in contrast to the CH intensities of aliphatic substituents.  相似文献   

CO observations of Southern molecular clouds. Outflows from young stellar objects GRV 8 and GRV 16     

A. L. Gyulbudaghian  J. May 《Astrophysics》2005,48(1):79-88

¹²CO (1-0) observations of two Southern dark clouds (globules) associated with cometary nebulae GRV 8 (a biconical nebula) and GRV 16 (a conelike nebula) are presented. GRV 8 shows an outflow from the central part of the nebula (where in 2MASS images a star is located, which is perhaps responsible for this outflow); however, both lobes of the outflow are redshifted with a velocity of +1.95 km/s with respect to the molecular cloud. The two opposite redshifted lobes are a rather rare phenomenon that could be explained by the presence of a double star instead of a single one as the engine responsible for the outflow. The two lobes are almost parallel to the axis of symmetry of the biconical nebula. In the case of the conelike nebula GRV 16 we observe a bipolar outflow, where the eastern blueshifted lobe has a velocity of –4 km/s with respect to the molecular cloud, and the western redshifted one has a velocity +2.5 km/s. The outflow has a direction almost coinciding with the axis of symmetry of the conelike nebula. The star associated with the conelike nebula is responsible for this outflow.Published in Astrofizika, Vol. 48, No. 1, pp. 101–112 (February 2005).  相似文献   

Oceanic environmental changes of subarctic Bering Sea in recent 100 years: Evidence from molecular fossils   总被引：4，自引：1，他引：4  

LU Bing  CHEN Ronghua  ZHOU Huaiyang  WANG Zipan  CHEN Jianfang & ZHU Chun Key Laboratory of State Oceanic Administration  The Second Institute of Oceanography  Hangzhou  China 《中国科学D辑(英文版)》2005,48(4):555-564

The objectives of the past studies of global cli-matological changes were to obtain and interpret in-formation about various macroclimates and paleoenvi-ronments, and to understand changing processes andmechanisms of the global system environment, so asto provide basic materials for establishing a physicalmodel of forecasting climate environment. To reduceuncertainty of forecast, it is particularly important totake variation sequences in short dimension and highresolution in global climatologic…  相似文献   

Space–time multiresolution atomistic visualization of MgO and MgSiO₃ liquid data     

Dipesh Bhattarai  Bijaya B. Karki  Lars Stixrude 《Visual Geosciences》2006,11(1):1-11

First-principles molecular dynamics simulations of complex material systems such as geophysically relevant oxide and silicate liquids produce massive amounts of time-varying three-dimensional data for the atomic configurations. Given the high accuracy of these data, it is desirable to extract as much information hidden in the data as possible. In this paper, we elaborate on our recently proposed scheme to support interactive visualization at space–time multiresolution of the atomistic simulation data. Instead of just focusing on direct rendering of the given data, additional data (containing more quantitative and qualitative information) that usually have to be extracted by some other means are extracted and rendered on the fly. This allows us to gain better insight into the global as well as local spatio-temporal behavior of the data in the context of bonding, radial distribution, atomic coordination, clustering, structural stability and distortion, and diffusion. We illustrate such visualization for the simulation data on the liquid phases of MgO and MgSiO₃—the two most abundant components of Earth’s mantle. Our analysis shows that the structure and dynamics of both liquids change substantially with compression, with no discernible effects of temperature in most cases.  相似文献   

Organic geochemistry of Deep Sea Drilling Project sediments from the Gulf of Calofornia—hydrothermal effects on unconsolidated diatom ooze     

Bernd R.T. Simoneit  R.P. Philp  P.D. Jenden  E.M. Galimov 《Organic Geochemistry》1984,7(3-4)

The effects of intrusive thermal stress have been studied on a number of Pleistocene sediment samples obtained from Leg 64 of the DSDP-IPOD program in the Gulf of California. Samples were selected from Sites 477, 478 and 481 where the organic matter was subjected to thermal stress from sill intrusions. For comparison purposes, samples from Sites 474 and 479 were selected as representative of unaltered material.The GC and GC-MS data show that lipids of the thermally unaltered samples were derived from microbial and terrestrial higher-plant detritus. Samples from sill proximities were found to contain thermally-derived distillates and those adjacent to sills contained essentially no lipids. Curie point pyrolysis combined with GC and GC-MS was used to show that kerogens from the unaltered samples reflected their predominantly autochthonous microbial origin. Pyrograms of the altered kerogens were much less complex than the unaltered samples, reflecting the thermal effects. The kerogens adjacent to the sills produce little or no pyrolysis products since these intrusions into unconsolidated, wet sediments resulted in in situ pyrolysis of the organic matter.Examination of the kerogens by ESR showed that spin density and line width pass through a maximum during the course of alteration but ESR g-values show no correlation with maturity. Stable carbon isotope (δ¹³C) values of kerogens decrease by 1–1.5‰ near the sills at Sites 477 and 481 and the atomic N/C decreases slightly with proximity to a smaller sill at Site 478. Differences in maturation behavior between Site 477 and 481 and Site 478 are attributed to dissimilarities in thermal stress and to chemical and isotopic heterogeneity of Guaymas Basin protokerogen.  相似文献