Y11B航空物探(电/磁)综合站西北找水初步成果   总被引：1，自引：1，他引：0  

孟庆敏 《物探与化探》1998,22(4):241-246

1997年9月23日～10月8日,在甘肃省安西—敦煌地区用Y11B航空物探(电/磁)综合站和GPS导航定位进行了地下水勘查试生产工作。用均匀大地模型,结合已知的水文地质资料,初步圈定了淡水区、过渡类型水区、咸水区和苦水区及泉水湖。所推断的水质和土壤含盐量与大的水文地质单元和1:20万水文地质普查报告都吻合得很好,且细节更为清楚。对差异较大的地方做了分析和解释。  相似文献   

翡翠的成因及宝石学意义刍论   总被引：1，自引：0，他引：1  

马婷婷  廖宗廷 《上海国土资源》1998,(2):43-48

从地质学角度出发,对翡翠的成因作了初步研究。以此研究结果为基础,探讨了翡翠的矿床类型,翡翠矿床的找矿方向及翡翠“B”货的科学鉴定。  相似文献   

The C/CO ratio in B335 and the decaying dark matter neutrino hypothesis     

Murphy  Little  & Kelly 《Monthly notices of the Royal Astronomical Society》1998,294(4):635-641

C¹⁸O J  = 2–1, C¹⁷O J  = 2–1 and [C  I ] ³P₁–³P₀ emission from the dense cold cloud B335 has been observed and modelled in order to determine the C/CO ratio. The observed ratio is compared with a prediction by Tarafdar who assumes a mechanism in which the CO dissociation is caused by photons of energy ∼ 13.8 eV. These were postulated by Sciama to result from the decay of dark matter neutrinos. Our value for the C/CO ratio sets an upper limit to the strength of the neutrino decay dissociation process, thus providing a significant datum for interstellar chemistry theory.  相似文献   

A complete infrared Einstein ring in the gravitational lens system B1938 + 666     

L.J. King  N. Jackson  R.D. Blandford  M.N. Bremer  I.W.A. Browne  A.G. de Bruyn  C. Fassnacht  L. Koopmans  D. Marlow  P.N. Wilkinson 《Monthly notices of the Royal Astronomical Society》1998,295(2):L41-L44

We report the discovery, using NICMOS on the Hubble Space Telescope , of an arcsec-diameter Einstein ring in the gravitational lens system B1938+666. The lensing galaxy is also detected, and is most likely an early-type galaxy. Modelling of the ring is presented and compared with the radio structure from MERLIN maps. We show that the Einstein ring is consistent with the gravitational lensing of an extended infrared component, centred between the two radio components.  相似文献   

Equivalent width, shape and proper motion of the iron fluorescent line emission from molecular clouds as an indicator of the illuminating source X-ray flux history     

R. Sunyaev  & E. Churazov 《Monthly notices of the Royal Astronomical Society》1998,297(4):1279-1291

Observations of the diffuse emission in the 8–22 keV energy range, elongated parallel to the Galactic plane, and detection of the strong 6.4-keV fluorescent line with ∼ 1 keV equivalent width from some giant molecular clouds (e.g. Sgr B2) in the Galactic Centre region suggest that the neutral matter of these clouds is (or was) illuminated by powerful X-ray radiation, which gave rise to the reprocessed radiation. The source of this radiation remains unknown. A transient source close to the Sgr B2 cloud, or a short outburst of the X-ray emission from a supermassive black hole at the Galactic Centre are the two prime candidates under consideration. We argue that a new generation of X-ray telescopes combining very high sensitivity and excellent energy and angular resolutions would be able to discriminate between these two possibilities when studying time-dependent changes of the morphology of the surface brightness distribution, the equivalent width and the shape of the fluorescent line in Sgr B2 and other molecular clouds in the region. We note also that detection of broad and complex structures near the 6.4-keV line in the spectra of distant AGNs, which are X-ray weak now, may prove the presence of violent activity in the central engines of these objects in the past. Accurate measurements of the line shape may provide information on the time elapsed since the outburst. Proper motion (super- or subluminal) of the fluorescent radiation wave front can give additional information on the location of the source. Observations of the described effects can provide unique information on the matter distribution inside Sgr B2 and other giant molecular clouds.  相似文献   

Struts+EJB构架在B/S开发中的应用与改进     

涂婷婷  段凡丁 《成都信息工程学院学报》2007,22(2):239-243

讲述了Struts＋EJB构架在B/S开发中的集成使用,介绍了EJB技术、Struts原理及其使用技巧;并总结技术优势.最后通过一个实例,讲述了使用EJB和Struts的方法并对其进行改进.  相似文献   

Chandra observations of neutron stars: an overview     

M. C. Weisskopf  M. Karovska  G. G. Pavlov  V. E. Zavlin  T. Clarke 《Astrophysics and Space Science》2007,308(1-4):151-160

We present an overview of Chandra X-ray Observatory observations of neutron stars. The outstanding spatial and spectral resolution of this great observatory have allowed for observations of unprecedented clarity and accuracy. Many of these observations have provided new insights into neutron star physics. We present an admittedly biased and overly brief review of these observations, highlighting some new discoveries made possible by the Observatory’s unique capabilities. This includes our analysis of recent multiwavelength observations of the putative pulsar and its pulsar-wind nebula in the IC443 SNR.   相似文献   

Immunotoxicity effect of benzo[α]pyrene on scallop Chlamys farreri     

Lin Zhang  Luqing Pan  Jing Liu 《中国海洋大学学报(英文版)》2009,8(1):89-94

The toxic effects of benzo[α]pyrene (B[α]P) at different concentrations (0.1, 0.5, 1, 2.5 and 7.5 μgL⁻¹) on scallop (Chlamy farreri) immune system were studied. The results showed that B[α]P had significant toxic effects on the haemocyte counts, neutral red uptake, phagocytosis, bacteriolytic and antibacterial activity (P<0.05), while the seawater control and acetone control had no significant differences. The haemocyte counts, neutral red uptake, phagocytosis and bacteriolytic activity in all B[α]P treatment groups as well as antibacterial activity in groups of 0.5, 1, 2.5 and 7.5 μgL⁻¹ B[α]P decreased significantly (P<0.05). Some of these indices tended to be stable on the sixth day and others on the ninth day, and the indices showed clear time- and concentration-response to B[α]P. Bacteriolytic activity in 0.1μgL⁻¹ B[α]P treatment group and antibacterial activity in 0.1 μgL⁻¹ and 0.5 μgL- B[α]P treatment groups increased at the beginning of exposure and reached their peaks on day 1 and day 6, respectively. Following that, both activities decreased gradually and became stable after day 9. When all the indices reached stability, they were significantly lower than those in control group (P<0.05), except for antibacterial activity in 0.1 μgL⁻¹ B[α]P treatment group (P>0.05). Thus, B[α] has evident toxic effects on scallop immune system, which supports the view that a relationship exists between pollution and immunomodulation in aquatic organisms.  相似文献   

High-resolution imaging of the anomalous flux ratio gravitational lens system CLASS B2045+265: dark or luminous satellites?     

J. P. McKean  L. V. E. Koopmans  C. E. Flack  C. D. Fassnacht  D. Thompson  K. Matthews  R. D. Blandford  A. C. S. Readhead  B. T. Soifer 《Monthly notices of the Royal Astronomical Society》2007,378(1):109-118

  相似文献   

CBERS-02B星数据融合方法评价   总被引：2，自引：0，他引：2  

于海洋  甘甫平  邱振戈 《国土资源遥感》2009,20(1):64-68

CBERS—02B星(以下简称02B星)多光谱CCD数据与全色HR数据空间分辨率相差较大，给图像融合带来一定困难。在对IHS变换、主成分分析变换、Brovey 变换、GS变换等融合算法分析的基础上，利用02B星数据进行了融合试验。通过对试验结果的目视评价与定量分析发现，PC变换和GS变换方法融合图像纹理信息较清晰，光谱保真度较好。在GS变换融合中，可利用02B星CCD相机第5波段模拟GS变换的低分辨率输入，融合结果统计值优于PC变换。  相似文献