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Dynamic Instability of Tunnel in Blocky Rock Mass

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Transactions of Tianjin university 2008年第6期14卷 457-463页

作者：戚承志陈灿寿钱七虎罗健 Department of civil Engineering Beijing Institute of Civil Engineering and Architecture PLA university of Science and Technology

The displacements and geometry of the rock blocks and the properties of the rock struc-ture play an important role in the stability of *** on the key block model,the dynamic instability analysis of underground tunnel subjected to intensive short-time compressional wave was *** instability of the tunnel caused by the spallation and the inertial effect was *** the influence of the roof contour curvature of tunnel was also determined.

关键词： blocky rock mass dynamic instability discontinuity surfaces key block

寒武、奥陶纪海平面变化与烃源岩发育关系——以塔里木盆地为例

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天然气工业 2005年第10期25卷 18-20,I0020页

作者：陈新军蔡希源高志前马士忠同济大学中国石油化工集团公司中国地质大学.北京

文章研究了寒武—奥陶纪海平面变化与烃源岩发育的关系,并探索其烃源岩的发育模式和分布规律。认为海平面变化和地壳沉降才是烃源岩发育决定性因素,其烃源岩发育模式泥质类烃源岩主要形成于广海陆棚—半深海盆地,处于深水沉积背景;陆棚... 详细信息

文章研究了寒武—奥陶纪海平面变化与烃源岩发育的关系,并探索其烃源岩的发育模式和分布规律。认为海平面变化和地壳沉降才是烃源岩发育决定性因素,其烃源岩发育模式泥质类烃源岩主要形成于广海陆棚—半深海盆地,处于深水沉积背景;陆棚相泥质烃源岩,其形成与上升洋流的作用有关;半深海相烃源岩的形成是由于深水缺氧,沉积速率低,使得有机质富集;碳酸盐岩烃源岩分布于盆地中西部,与膏岩、盐岩有着密切的共生关系。

关键词：塔里木盆地寒武纪奥陶纪海平面变化地壳沉降控制烃源岩发育海相烃源岩寒武-奥陶纪

Grade and Tonnage Model of contact　Metasomatic copper Deposit in c.ina

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Journal of Earth Science 2000年第1期19卷 76-80页

作者： Wang Xueping Wei Min Faculty of Earth Resources, c.ina university of {2., Wuhan 430074 Yang Lipei Zhao Jingman c.ina Mineral Information Research Institute, beijing 100037

Grade-tonnage model is one of the research frontiers of systematical exploration theory. Based on the “Reserve Database of Mineral Resources in c.ina (1997)”, this paper establishes the geological model, grade model, tonnage model, grade-tonnage model and tonnage-sequence model of contact metasomatic copper deposits in c.ina. The mathematical properties of these models are described in detail.

关键词： contact metasomatic copper deposit grade model tonnage model grade-tonnage model tonnage-sequence model c.ina.

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冠状动脉介入治疗术后床上活动时间的探讨

实用护理杂志 2002年第9期18卷 1-2页

作者：于艳青吴瑛北京大学第三医院心内科北京100083 北京大学护理学院北京100083

目的　探讨冠状动脉介入治疗术后最佳床上活动时间。方法　采用方便取样 ,随机分组将 4 4例患者分为实验组和对照组 ,2.分别在拔管后 6h和 2.4h床上活动 ,观察 2.病人床上活动后穿刺点出血、血肿发生率及舒适度的影响。结果　实验组... 详细信息

目的　探讨冠状动脉介入治疗术后最佳床上活动时间。方法　采用方便取样 ,随机分组将 4 4例患者分为实验组和对照组 ,2.分别在拔管后 6h和 2.4h床上活动 ,观察 2.病人床上活动后穿刺点出血、血肿发生率及舒适度的影响。结果　实验组活动后 2.病人在拔管后 8h、2.4h、2.6h无 1例出现穿刺点出血、局部血肿。但在拔管后8h、2.4h 2.病人在腰背疼痛、失眠、排尿困难、食欲下降、烦躁等舒适度方面的差异有显著性。结论　拔管后 6h进行床上活动是安全。

关键词：经皮冠状动脉腔内成形术床上活动时间并发症舒适度护理支架植入术

A Method of Recovering Vocal Tract Impulse Response Based on a New Model for complex cepstrum of Voiced Speech

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A Method of Recovering Vocal Tract Impulse Response Based on...

Timing in the Time Domain: cygnus X-1

2.02.第6届信号处理国际会议

作者： Zhong Yan-ping Shen Song-hua beijing university of Aeronautics and Astronautics beijing 100083 c.ina

＜正＞ By analyzing a new model for short-time complex cepstrum of voiced speech, this paper proposes a new method for homomorphic deconvolution to recover the vocal tract impulse response. The experiment results are given and the effects of pitch period on the recovery of vocal tract impulse response are discussed in the paper.

关键词：

来源： cnki会议评论

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chinese Journal of Astronomy and Astrophysics 2001年第4期1卷 313-332页

作者： Ti-Pei Li (Department of Physics and center for Astrophysics, Tsinghua university, beijing 100084 High Energy Astrophysics Lab., Institute of High Energy Physics, chinese Academy of Sciences, beijing 100039)E-mail:litp@*** Department of Physics and center for Astrophysics Tsinghua University Beijing 100084 High Energy Astrophysics Lab. Institute of High Energy Physics Chinese Academy of Sciences Beijing 100039

Quantities characterizing temporal property, e.g., power density, coherence, and time lag, can be defined and calculated directly in the time domain without using the Fourier transformation. Spectral hardness, variability duration, and correlation between different characteristic quamtities on different time scale can be studied in the time domain as well. The temporal analysis technique in the time domain is a powerful tool, particularly in studying rapid variability on short time scales (or in high frequencies). Results of studying variabilities of X-rays from cyg X-1 with the analysis technique in the time domain and RXTE data reveal valuable clues to understanding production and propagation processes of X-rays and structure of accretion disk in the black hole system.

关键词： methods: data analysis - stars: individual (cygnus X-1) - X-rays: stars

A scoring model for predicting the prognosis of severe viral hepatitis

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中华医学杂志(英文版) 2005年第3期000卷 74-76页

作者： DING Hui-guo, XIANG Hai-ping, SHAN Jing, ZHOU Li, MA Bing, LIU Min and WANG Jun-taoDepartment of GI & Hepatology, beijing Youan Hospital of capital Medical university, beijing 100054, c.ina Department of Health and Epidemiology, Peking university Health Science center, beijing 100083, c.ina Department of GI & Hepatology Beijing Youan Hospital of Capital Medical University Beijing 100054 China Department of Health and Epidemiology Peking University Health Science Center Beijing 100083 China

The prognosis of patients with severe viral hepatitis is concerned by clinicians, patients and their relatives. Many factors may influence on the prognosis of patients with this disease. Many studies on the prognosis of severe viral hepatitis by multiple logistic regression analysis have shown generally consistent results.1-4 Previouly we established a scoring model of severe viral hepatitis （SMSVH） by logistic regression analysis.1 The aim of this study was to estimate prospectively the 6-month survival rate of patients with severe viral hepatitis using SMSVH.

关键词： severe viral hepatitis · survival analysis · prognostic factors

Patterns of magpie nest utilization by a nesting raptor community in a secondary forest

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Progress in Natural Science:Materials International 2009年第10期19卷 1253-1259页

作者： Tong Zhou a,Haitao Wang a,c,Yu Liu b,Fumin Lei c,Wei Gaoa,a Key Laboratory of Vegetation Ecology,Ministry of Education,School of Life Sciences,Northeast Normal university,changchun 13002.,c.ina b Natural History Museum,Northeast Normal university,changchun 130117,c.ina c Institute of Zoology,chinese Academy of Sciences,beijing 100101,c.ina [a]Key Laboratory of Vegetation Ecology Ministry of Education School of Life Sciences Northeast Normal University Changchun 130024 China [b]Natural History Museum Northeast Normal University Changchun 130117 China [c]Institute of Zoology Chinese Academy of Sciences Beijing 100101 China

For a total of 9 years,we examined the patterns of a nesting raptor community that utilized European Magpie(Pica pica) nests in the Zuojia Natural Reserve,northeast *** raptor species and two other bird species were recorded nesting in magpie *** reuse rate of abandoned magpie nests was 51.6%,and the number of reused nests was positively correlated with their *** utilized 83.3% of the reused abandoned magpie *** followed for more than 1 year were reused by raptors an average of 1.13 ***-specific nest usurpation was common,with 17.3% of new magpie nests being usurped by raptors,and four cases of usurpation occurred among different raptor *** the community level,8 of 11 raptor species took over magpie nests to breed in the study area,and 91.9% of their nests came from magpie *** Magpies represent the core species in the nest web of the local raptor community that utilizes magpie *** the forest stand level,closer proximity to forest edges and greater distances from occupied raptor nests were the best predictors of nest *** the nest-site level,arbor density and canopy coverage were the best predictors of nest reuse.

关键词： European Magpie Nest reuse Nest usurpation Raptor community

On the construction of Some New Harmonic Maps from R^m to H^m

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Acta Mathematica Sinica,English Series 2001年第2期17卷 301-304页

作者： Yuguang SHI Department of Mathematics. Peking university, beijing 100871, P. R.{2. Department of Mathematics Peking University Beijing 100871 P. R. China

In this note, we const, ruct some new harmonic maps from R^m to H^m via symmetric methods.

关键词： Harmonic Maps Symmetric Methods