γ射线在ICT中的能谱硬化与散射修正

γ射线在ＩＣＴ的原始数据中含有各种误差，要作校正。本文研究了能源硬化与散射修正，并且队出了相应的数学模式。     

河北省饮料工业现状及发展目标

近１０年来，河北省饮料工业发展迅速。矿泉水更是异军突起，现有设计生产能力为２０万ｔ／ａ。１９９４年产量为４．５万ｔ，比１９９３年增长７．２倍。包括矿泉水在内的饮料工业目前存在的问题是，产量少，规模小，名牌少，中小型企业技术装备落后，产品结构不合格。今后主要应以矿泉水为基液，发展多品种，名牌优质饮料，降低成本，以适应各层次消费者的需要。     

1982年6月12日耀斑的巴耳末线半宽特征

Usually,because of the Starkbroadening for the spectrum lines,the half widths of hydrogen higher Balmer emission lines of the solar flare increase with the principal quantum number N. Their variation curve,as observed before,has a minimum value near N=8 or 9. However,a curve for the solar flare which occurred at the limb of solar disk on June 12,1982shows an all-time decline with increasing N. How to explain this phenomena remains to be discussed.     

Automatic Solar Flare Tracking Using Image-Processing Techniques

Measurement of the evolution properties of solar flares through their complete cyclic development is crucial in the studies of Solar Physics. From the analysis of solar H images, we used Support Vector Machines (SVMs) to automatically detect flares and applied image segmentation techniques to compute their properties. We also present a solution for automatically tracking the apparent separation motion of two-ribbon flares and measuring their moving direction and speed in the magnetic fields. From these measurements, with certain assumptions, we inferred the reconnection of the electric field as a measure of the rate of the magnetic reconnection in the corona. The automatic procedure is a valuable tool for real-time monitoring of flare evolution.     

Pilot-scale field model tests for detecting landfill leachate intrusion into the subsurface using a grid-net electrical conductivity measurement system

The grid-net electrical conductivity measurement system for detecting exact locations of landfill leachate intrusion in the subsurface was developed in this study. Laboratory and pilot-scale field model tests were performed to evaluate the direct application of a grid-net electrical conductivity measurement system for the detection of landfill leachate. A significant increase in electrical conductivity of soil was observed by adding landfill leachate. This can be explained as an increase in electrical conductivity of pore fluid due to an increase in leachate constituents as charge carriers. In pilot-scale field model tests, leachate intrusion locations were accurately identified at the initial stage of landfill leachate release by the grid-net electrical conductivity measurement system. The electrical conductivity of the subsurface before leachate injection lay within a small range of 24.8–43.0 S/cm. The electrical conductivity values in detected points were approximately ten times more than the conductivity values of the subsurface without landfill leachate intrusion. The results in this study indicate that the grid-net electrical conductivity measurement method has a possible application for detecting locations of landfill leachate intrusion into the subsurface at the initial stage, and thus has great potential in monitoring leachate leakage at waste landfills.     

Organochlorine contaminants in sea turtles from the Eastern Pacific

We measured organochlorine residues in three species of sea turtles from the Baja California peninsula, Mexico. Seventeen of 21 organochlorine pesticides analyzed were detected, with heptachlor epoxide and gamma-hexachlorocyclohexane the most prevalent (14 (40%) and 11 (31%) of the 35 tissue samples, respectively). PCBs were detected in all but one of the 9 turtles studied, with congener 18 the most commonly detected (8 (23%) of the samples). The dioxin-like congeners 118 and 180 were detected in 4 (11%) and 3 (9%) of the samples, respectively. Percent contribution of congeners was negatively correlated to their octanol-water partition coefficients, with kidney and muscle containing more lower-chlorinated congeners than liver or adipose samples. Levels of organochlorines detected in the present study were low, potentially attributable to the feeding habits of the predominant species collected in this study (herbivorous) and/or the samples obtained in an unindustrialized region.     

东南亚夏季强降水的基本物理量场的诊断分析

本文对东南亚夏季5月、6月、7月份的四个强降水过程进行研究，通过对其相应的基本物理量场的作诊断分析，研究东南亚地区夏季强降水的物理机制，为东南亚地区的强降水分析和预报提供依据。     

Sorption behavior of U(VI), ~(234)U(VI) and ~(238)U(VI) onto fracture-filling clays in Beishan granite, Gansu: Application to selecting the site of high-level radwaste repository in China

Knowing the transport of uranium and radionu-clides through the environment is important for as-sessing the risk posed by long-term disposal of rad-waste. Granitic rocks have been selected as a host-rock type for the first high-level radwaste repository in China. According to the Chinese High-level Rad-waste Management Program, high-level radwaste (HLW) will be buried at 800―1000 m depth in a granitic pluton in Northwest China and, specifically, in the A granitic complex of Beishan area,…