鄂尔多斯盆地黄土山地地震资料采集技术

鄂尔多斯盆地黄土山地区和巨厚黄土沙漠区因其特有的地震地质特征,高分辨率岩性地震勘探面临着许多难题。90年代中期以来,针对不同地表条件、不同地质目标,经过多年的科研攻关,形成了三种采集系列技术:沟中弯线高分辨率采集技术、多直线高分辨率采集技术、三维采集技术,并进行了工业化生产,获得了高信噪比、高分辨率、高保真度的地震资料,取得了显著的经济和社会效益。     

ELEMENTAL CONCENTRATIONS AND THEIR SIZE DISTRIBUTIONS OF BEIJING AEROSOL IN JANUARY

Aerosol sampling was carried out at a city centre site and a suburb site in Beijing in January 1983. PIXE (Proton Induced X-ray Emission) compatible cascade impactors were employed. The samples were analysed for 20 elements by PIXE in Fudan University. It has been found that most of the elements have bi-mode size distributions with a gradual progression from mainly coarse mode Ca, Ti and Al to mainly fine mode Zn, As and Pb. Elements Cl, K, S and Si show most obvious bi-mode, of which Si and S are particularly interesting. The concentrations of coarse mode aerosol in the city centre are about 1.4 times as large as that in the suburb for most of the elements, while the concentrations of fine mode aerosol in the city centre differ greatly from that in the suburb and vary significantly among elements, indicating some industrial sources. The enrichment factors of elements indicate that the coal smoke has a large-scale influence in North China.