时空多点连续定向取心技术应用研究          下载免费PDF全文

周策  陈文俊 《探矿工程》2004,31(8):36-38

为解决以往定向仪不抗振、岩样采取率不高等问题，利用时间与钻孔空间位置对应的关系，研制成功了KD型定向仪。详细介绍了该定向仪的基本构成、技术参数及现场应用情况。  相似文献   

Recent progress of glaciological studies in China     

LIU Shiyin  WANG Ninglian  DUAN Keqin  XIAO Cunde  DING Yongjian  HAN Haidong 《地理学报(英文版)》2004,14(4):401-410

1IntroductionIn the early 1960s, glaciers in western China were classified into maritime- and continental-types by different glacial environment and physical characteristics (Shi and Xie, 1964). With extensive glaciological investigations in the western regions (Lanzhou Institute of Glaciology and Geocryology of CAS, 1988), Lai and Huang (1990) suggested a new classification of temperate, subpolar and quasipolar glaciers, corresponding to the maritime-, subcontinental- and extremely contin…  相似文献   

Fluid core resonance revealed from a laser extensometer at the Rokko-Takao station, Kobe, Japan     

Atsushi Mukai  Shuzo Takemoto  Takeyasu Yamamoto 《Geophysical Journal International》2004,156(1):22-28

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Recent progress of glaciological studies in China     

LIU Shiyin  WANG Ninglian  DUAN Keqin  XIAO Cunde  DING Yongjian  HAN Haidong 《地理学报》2004,14(4):401-410

Glacier inventory compilation during the past 20 years and modifications of that for the Eastern Pamir and Banggong Lake indicate that there are 46,342 modern glaciers with a total area and volume of 59415 km2 and 5601 km3 respectively in China. These glaciers can be classified into maritime and continental (including sub-continental and extremely continental) types. Researches show that glaciers in China have been retreating since the Little Ice Age and the mass wastage was accelerated during the past 30 to 40 years. Being an important part of glaciological studies in China, ice core climatic and environmental studies on Tibetan Plateau and in the Antarctica have provided abundant, high resolution information about past climatic and environmental evolution over the Tibetan Plateau and Antarctica. Except for different parameters recorded in ice cores relating to climate and environment changes on Tibetan Plateau, records from ice cores extracted from different glaciers show that the discrepancies in climatic and environmental changes on the north and south parts of the plateau may be the consequence of different influencing effects from terrestrial and solar sources. Glaciological and meteorological phenomena imply that Lambert Glacier valley is an important boundary of climate in the east Antarctica, which is thought to be connected with cyclonic activities and Circum-polar Waves over the Antarctica.  相似文献   

Gross thermodynamics of two-component core convection     

David Gubbins  Dario Alfè  Guy Masters  G. David Price  Michael Gillan 《Geophysical Journal International》2004,157(3):1407-1414

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Constraints on density and shear velocity contrasts at the inner core boundary   总被引：3，自引：0，他引：3  

Aimin Cao  Barbara Romanowicz 《Geophysical Journal International》2004,157(3):1146-1151

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Impact of inner core rotation on outer core flow: the role of outer core viscosity     

J. Y. Guo  P. M. Mathews  Z. X. Zhang  J. S. Ning 《Geophysical Journal International》2004,159(1):372-389

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Interannual Variability in Pollen Dispersal and Deposition on the Tropical Quelccaya Ice Cap*     

Carl A. Reese  Kam‐biu Liu 《The Professional geographer》2005,57(2):185-197

Pollen collected from snow samples on the Quelccaya Ice Cap in 2000 and 2001 reveals significant interannual variability in pollen assemblage, concentration, and provenance. Samples from 2000, a La Niña year, contain high pollen concentrations and resemble samples from the Andean forests (Yungas) to the east. Samples from 2001, an El Niño year, contain fewer pollen and resemble those from the Altiplano. We suggest that varying wind patterns under different El Niño/Southern Oscillation (ENSO) conditions may affect the processes of pollen transport over the Altiplano and on the ice cap, although confounding variables such as flowering phenology and sublimation should also be considered  相似文献   

Constraints on the outer-core tangent cylinder using normal-mode splitting measurements     

Miaki Ishii  Adam M. Dziewo&#;ski 《Geophysical Journal International》2005,162(3):787-792

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Ice-core pollen record of climatic changes in the central Andes during the last 400 yr     

Kam-biu Liu  Carl A. Reese 《Quaternary Research》2005,64(2):272-278

This paper presents a high-resolution ice-core pollen record from the Sajama Ice Cap, Bolivia, that spans the last 400 yr. The pollen record corroborates the oxygen isotopic and ice accumulation records from the Quelccaya Ice Cap and supports the scenario that the Little Ice Age (LIA) consisted of two distinct phases—a wet period from AD 1500 to 1700, and a dry period from AD 1700 to 1880. During the dry period xerophytic shrubs expanded to replace puna grasses on the Altiplano, as suggested by a dramatic drop in the Poaceae/Asteraceae (P/A) pollen ratio. The environment around Sajama was probably similar to the desert-like shrublands of the Southern Bolivian Highlands and western Andean slopes today. The striking similarity between the Sajama and Quelccaya proxy records suggests that climatic changes during the Little Ice Age occurred synchronously across the Altiplano.  相似文献