在复杂地层钻进物探震源孔系列钻头的研制与应用          下载免费PDF全文

刘玉民  孙艳龙  贾志勇 《探矿工程》2000,(2):25-27

在密山一带休物探震源孔,外遇地层为胶泥、沙土、风化岩、青石板及河流石等。为此研制了一系列新式钻头,包括９８ｍｍ三牙轮钻头、９８ｍｍ刮刀式ＰＤＣ钻头及１１８ｍｍ砾石流沙炮眼防卡钻头,前２种钻头现场共应用９３０口井,创造了极好的经济效益和社会效益。  相似文献   

反循环钻进井底净化的研究   总被引：2，自引：0，他引：2       下载免费PDF全文

陈晨  卢文阁 《探矿工程》2000,(1):60-62

把反循环钻进中循环液体视为刚体 ,以力矩平衡等理论为依据 ,建立井底净化模型 ,对影响井底净化效果的各种因素如地层、钻头结构、工作规程、井底流场、压持效应和渗透规律等进行综合研究 ,推出最优净化条件 ,通过室内及野外试验进行验证。  相似文献   

Micro-area Chemical Composition and Preserved P-T Evolution Trace of Phengite in Albite Gneiss from the Donghai Ultrahigh-Pressure Metamorphic Area, East China   总被引：3，自引：0，他引：3  

LIU Fulai  ZHANG Zeming  XU Zhiqin  YANG Jingsui  XU HuifenInstitute of Geology  Chinese Academy of Geological Sciences  Beijing  China 《《地质学报》英文版》2000,74(2):183-189

Study of micro-area chemical compositions indicates that phengite in albite gneiss from hole ZK2304 of the Donghai region has evident compositional zoning. SiO2 and tetrahedrally coordinated Si contents decrease, and Al2O3, AlIV and AlVI contents increase gradually from core to rim. However, K2O, MgO and FeO contents basically remain unchanged from core to rim. According to P-T estimates obtained from geothermometers and barometers, combined with previous experimental data, the core belt (micro-area I) of phengite was formed at T=637-672℃ and P=1.55-1.73 GPa, and the transitional belt (micro-area II) of the phengite were formed at r=594-654℃ and P=1.35-1.45 GPa. Towards the rim belt (micro-area III), the temperature decreased slightly, but the pressure decreased rapidly with r=542-630℃ and P=1.12-1.19 GPa. The P-T evolution path recorded by the compositional zoning of phengite is characterized by significant near-isothermal decompression, revealing that the gneiss has. undergone high-pressure-ultrahi  相似文献   

CygX-1 X辐射的功率谱   总被引：1，自引：1，他引：0  

陈黎  冯育新  李惕碚  李宗伟 《中国天文和天体物理学报》2000,20(1)

运用自回归功率谱研究CygX－1X辐射的频谱特征,结果显示CygX－1转换态和高／软态时变频谱的连续成分,可以统一由有截断的幂律加噪声成分描述,转换态存在小于3Hz的宽峰结构及准周期振荡（QPO）成分（4－12Hz）,而高／软态完全可由截断幂律谱描述,不存在显著的QPO．截断频率在各态都相当稳定,在不同态的演化与平流为主的吸积流模型（ADAF）预期的情形一致．本文结果表明,自回归功率港分析是研究X射线双星光变特征的一个有效的方法．  相似文献   

Evolution at z≥ 0.5 of the X-ray properties of simulated galaxy clusters: comparison with observational constraints     

S. Ettori  S. Borgani  L. Moscardini  G. Murante  P. Tozzi  A. Diaferio  K. Dolag  V. Springel  G. Tormen  L. Tornatore 《Monthly notices of the Royal Astronomical Society》2004,354(1):111-122

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复杂地质条件下浅埋隧道施工方案的研究   总被引：2，自引：0，他引：2  

苏红卫  何华 《地质与勘探》2000,36(3):75-78

结合浙江省上三线任胡岭隧道浅埋段,对明挖和暗挖和两种施工方案进行了详细的技术经济比较,针对复杂的地质条件,采用了挖孔桩系梁帷幕暗挖的施工方案并利用有限元方法对该方案进行了模拟分析,保证了施工的 顺利进行。实践证明,该方法是成功的、可行的、节省了投资,缩短了工期,为浅埋隧道的施工提供了一种新的方法。  相似文献   

泵吸反循环钻进深度的理论探讨与实践   总被引：1，自引：0，他引：1  

廖光华 《地质与勘探》2000,36(2):32-34

从理论上分析了泵吸反循环施工百米超深孔的可行性 ,并介绍实际施工中采取的技术措施和取得的良好效果 ,对同类工程施工具有一定的指导意义。  相似文献   

Optical studies of the X-ray transient XTE J2123−058 – I. Photometry     

C. Zurita  J. Casares  T. Shahbaz  P. A. Charles  R. I. Hynes  S. Shugarov  V. Goransky  E. P. Pavlenko  Y. Kuznetsova 《Monthly notices of the Royal Astronomical Society》2000,316(1):137-142

We present optical photometry of the X-ray transient XTE J2123−058, obtained in 1998 July–October. The light curves are strongly modulated on the 5.95-h orbital period, and exhibit dramatic changes in amplitude and form during the decline. We used synthetic models, which include the effect of partial eclipses and X-ray heating effects, to estimate the system parameters, and we constrain the binary inclination to be i =73°±4. The model is successful in reproducing the light curves at different stages of the decay by requiring the accretion disc to become smaller and thinner by 30 per cent as the system fades by 1.7 mag in the optical. From August 26 the system reaches quiescence with a mean magnitude of R =21.7±0.1 and our data are consistent with the optical variability being dominated by the ellipsoidal modulation of the companion.  相似文献   

X-ray observation of XTE J2012+381 during the 1998 outburst     

S. Naik  P. C. Agrawal  B. Paul  A. R. Rao  S. Seetha  K. Kasturirangan 《Journal of Astrophysics and Astronomy》2000,21(1-2):29-38

The outburst of X-ray transient source XTE J2012+381 was detected by the RXTE All-Sky Monitor on 1998 May 24th. Following the outburst, X-ray observations of the source were made in the 2–18 keV energy band with the Pointed Proportional Counters of the Indian X-ray Astronomy Experiment (IXAE) on-board the Indian satellite IRS-P3 during 1998 June 2nd–10th. The X-ray flux of the source in the main outburst decreased exponentially during the period of observation. No large amplitude short-term variability in the intensity is detected from the source. The power density spectrum obtained from the timing analysis of the data shows no indication of any quasi-periodic oscillations in 0.002–0.5 Hz band. The hardness ratio i.e. the ratio of counts in 6–18 keV to 2–6 keV band, indicates that the X-ray spectrum is soft with spectral index >2. From the similarities of the X-ray properties with those of other black hole transients, we conclude that the X-ray transient XTE J2012+381 is likely to be a black hole.  相似文献   

Massive particle radiation from Gibbons-Maeda black hole     

方恒忠 《海洋学报(英文版)》2010,29(11)

This paper investigated the massive particle radiation from Gibbons--Maeda black hole by using a semi-classical method. The calculations showed that, if the self-gravitation of the radiated particle is taken into account, the radiation spectrum deviates from exact black body spectrum and the rate of tunneling equals precisely the exponent of the difference of the black hole entropies before and after emission. The conclusion supports the viewpoint of information conservation.  相似文献