基于高速铁路路基B组填料工艺试验技术分析     

景淑媛  戚燕  杜文举 《四川地质学报》2014,34(3):421-423

基于高速铁路路基工后变形的严格要求,路基填料改良成为高速铁路路基必须解决的难点和重点,本文结合某高速铁路路基使用B组填料改良施工,对其施工工艺方案进行了分析,提出了经济合理可行的施工工艺和施工流程,明确了施工中质量控制的要点,为同类使用B组填料的铁路路基施工,提供了参考依据。  相似文献   

新疆谢米斯台地区小岩体型矿化遥感探测     

尹芳  刘磊  张继荣  周军 《地球学报》2014,35(5):561-566

中酸性小岩体易被地质填图遗漏,严重制约了该类型矿化的发现。在新疆西准噶尔谢米斯台地区找矿工作中,首先利用ETM+数据进行小岩体扫面,进而选取重点区采用ETM+和中巴资源卫星02B HR数据进行分辨率融合后解译、识别中酸性小岩体,并利用主成分分析法提取蚀变遥感异常,结合地质、化探信息综合分析后确定重点检查区域。利用此方法共解译出14个钾质花岗岩和3个黑云母花岗岩小岩体,这些小岩体大多被野外检查所证实。经野外检查发现了5处铜、金矿化点,证实了该方法的有效性。本研究中采用的方法可以为西部地区地质填图和中酸性小岩体型矿产资源勘查提供借鉴。  相似文献   

Variation of the 0+ ion density during low and high solar activity as measured by the SR0SS-C2 satellite     

《Atmósfera》2014,27(3):227-237

The O⁺ ion density measured by the SROSS-C2 satellite during solar minima (year 1995, F_10.7 = 77) and maxima (year 2000, F_10.7 = 181) has been analyzed for studying diurnal, seasonal, latitudinal and geomagnetic variations. The study region covers an area encompassed between 5-3 5° N latitude and 65-95° E longitude over India at a ~500 km altitude (F2 region). The year 2000 shows significant enhancement in the annual average of O⁺ ion density and attainment of post sunset secondary enhancement compared to 1995. Attributed to photoionization, daytime shows a maximum ionization compared to nighttime. However, attainment of post sunset secondary maxima is attributed to the strong pre-reversal enhancement in the vertical E x B drift. The effect of geomagnetic activity Kp through the E x B drift dynamic movement on O⁺ ion density distribution studies indicates periodicities of seven and nine days in 1995 and 2000, respectively, and polynomial dependency of the O⁺ ion density on geomagnetic activity Kp. Further on, stratification of the O⁺ ion density according to latitude (5-35° N) indicates high density in mid-latitudes (12-24° N) compared to high and low latitudes, except in the winter of 1995, which shows a distinct trend (i.e., density decreases with increasing latitude).  相似文献   

“智慧利民”数字开发区建设及实际应用     

丁思磊  陈云 《测绘与空间地理信息》2014,(10):156-157

＂数字开发区＂的理念就是把开发区作为一个生态系统,其中的居民、交通、能源、商业、通信、水资源等构成一个整体,各部分相互联系、彼此影响。本文简要介绍了＂智慧利民＂数字开发区建设及实际应用情况。  相似文献   

A search for extragalactic H₂O maser emission towards IRAS galaxies – II. Discovery of an H₂O maser in the type 1 Seyfert galaxy NGC 4051     

Yoshiaki Hagiwara  Philip J. Diamond  Makoto Miyoshi  Emmanouel Rovilos  Willem Baan 《Monthly notices of the Royal Astronomical Society》2003,344(4):L53-L57

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Optical spectroscopy of the radio pulsar PSR B0656+14     

S. Zharikov  R. E. Mennickent  Yu. Shibanov  V. Komarova 《Astrophysics and Space Science》2007,308(1-4):545-549

We have obtained the spectrum of a middle-aged PSR B0656+14 in the 4300–9000 Å range with the ESO/VLT/FORS2. Preliminary results show that at 4600–7000 Å the spectrum is almost featureless and flat with a spectral index α _ν ??0.2 that undergoes a change to a positive value at longer wavelengths. Combining with available multiwavelength data suggests two wide, red and blue, flux depressions whose frequency ratio is about 2 and which could be the 1st and 2nd harmonics of electron/positron cyclotron absorption formed at magnetic fields ～10⁸ G in upper magnetosphere of the pulsar.  相似文献   

'Notches' in the average profiles of bright pulsars     

Maura A. McLaughlin  Joanna M. Rankin 《Monthly notices of the Royal Astronomical Society》2004,351(3):808-812

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A model for 'double notches' in radio pulsar profiles     

G. A. E. Wright 《Monthly notices of the Royal Astronomical Society》2004,351(3):813-822

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XMM–Newton observations of GB B1428+4217: confirmation of intrinsic soft X-ray absorption     

M. A. Worsley  A. C. Fabian  A. Celotti  K. Iwasawa 《Monthly notices of the Royal Astronomical Society》2004,350(4):L67-L71

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Single pulses from PSR B1641–45     

Simon Johnston 《Monthly notices of the Royal Astronomical Society》2004,348(4):1229-1235

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