302铀矿床热液的混合和沸腾垂直分带模式

３０２隐伏铀矿床以其矿化垂幅大和原生垂直分带保存完整而在华南铀成矿区具有典型意义。本文提出了一个热液的混合和沸腾垂直分带模式。热液的混合是指大气降水、幔源流体以及花岗岩中残留热液的三元混合。矿前阶段发生了规模较大的热液混合作用，这导致了矿床垂直分带雏形的形成。成矿阶段发生的热液沸腾作用有利于进一步增强矿前阶段形成的矿床垂直分带程度。矿后一定程度的改造作用形成了矿床垂直分带的现代格局。     

THE EFFECT OF ISOLATED TOPOGRAPHY ON WEST FLOW

With the Fourier-expanding expression of isolated topography,the forcing of isolated topography is studiedin this paper.In the initial condition of steady uniform west flow in β-plan channel model,the approximatesolution of quasi-geostrophic potential vorticity equation is obtained.The results indicate that a series ofsteady topographic standing and transient waves can be produced by the forcing of isolated topography.Thewave can move eastward or westward according to the wave scales.The most slowly Rossby wave is thestrongest wave.So is the standing wave corresponding to the wave number.The main action of topographyis to produce these strong waves.It is suggested that action of topography is one of the main causes to pro-duce low frequency oscillation and long-range steady weather.     

长江三峡地区地震活动度分析

本文运用地震活动度的概念，对三峡地区地震活动特征及其与地质构造的关系进行了分析，得出了本地区地震度年平均值低，Ms≥2.0级地震与构造有密切关系等结论。     

河相关系研究的各种方法及其间关系

河相关系的研究旨在寻求河床地貌形态与流域因子的定量关系。除了传统的水文统计方法外,已有多种理论被用来对这一问题进行探索,这些研究方法相互之间都存在一定的关系,发现和认识这些关系将对河相关系的研究产生深刻的影响。本文在这方面作了探讨。     

赤道西太平洋-印度洋海温异常对亚洲夏季风的影响

本文采用了p-σ五层原始方程模式模拟并研究了赤道西太平洋-印度洋海温距平场对亚洲夏季风的影响,计算了四种不同的海温距平试验方案。试验结果表明赤道西太平洋海温正距平使对流层下层的印度低压明显加强,副高北挺,季风槽加深,同时加强了对流层上层的反气旋环流。赤道西印度洋暖海温的模拟结果与赤道西太平洋暖海温对上述系统的影响相反,而赤道西印度洋冷海温对季风环流的影响与赤道西太平洋暧海温的影响一致。试验进一步表明赤道西太平洋-印度洋海温距平的纬向梯度方向对亚洲夏季风的影响是主要的,这一结论与实际观测结果一致。本文进一步讨论了赤道海温距平对越赤道气流、印度洋赤道东-西纬向环流和非绝热加热场的影响,结果都表明赤道西太平洋海温正距平和赤道西印度洋海温负距平的模拟特征与反El Nino年亚洲夏季环流特征类似,而赤道西印度洋海员正距平的模拟特征与El Nino年亚洲夏季坏流特征类似。     

NUMERICAL STUDY OF THE SHORT-TERM CLIMATIC OSCILLATION FORCED BY EL NINO DURING NORTHERN WINTER

Using a nine-layer global spectral model, numerical schemes with two different SST distributions in January(control case and abnormal case) have been tested to study the climatic effect, propagation charateristics and the maintenance mechanism of the short-term climatic oscillation caused by El Nino during northern winter. The main results are as follows:(1) During northern winter, there exist two wave trains because of the influence of El Nino. One is similar to PNA pattern, and the other is similar to EUP pattern.(2) The PNA-like wave train caused by the anomalous SST forcing in central and eastern equatorial Pacific Ocean is due to the response of ultralong wave and long wave components of Rossby mode, and the EUP-like wave traincrossing Eurasia is mainly due to the wave component of Rossby mode.(3) During northern winter, the warm water region in central equatorial Pacific Ocean is the source of forced wave trains.(4) In northern winter,the energy source for maintaining the short-term climatic oscillation is from the interaction between eddies, and between eddy and zonal flow.     

Application of polarization analysis in correcting the orientation error of a downhole seismometer

This paper shows that the polarization analysis of later arrivals could be used to estimate the orientation error and the tilt of the downhole accelerometers in the Dahan downhole strong-motion array. This four-level array is located to the north of Hualien city in eastern Taiwan. Polarization analysis of a windowed signal which includes significant phases (e.g. primary S wave) can give a stable major polarization axis. This axis can then be used as the reference direction for correcting the orientation error and the tilt of the downhole seismometers. If the surface instrument is chosen as the reference, the angle between the major polarization axes of the surface and any downhole recordings will be the orientation error needed to be corrected for the downhole accelerograph. This angle is a combination of the tilt and the orientation errors which correspond to the dip and strike of maximum polarization, respectively. At the Dahan downhole strong-motion array, the orientation errors of the seismometers at the depth of 50, 100 and 200 m were 1°, 90° and 84°. These orientation errors were consistent with the horizontal particle-motion analysis. The errors of horizontal plane (tilt) were almost zero. After correction, the coherency of the waveforms between the surface and the downhole recordings was significantly improved.     

我国煤矿坑道钻探装备技术进展与展望

煤矿坑道钻探装备技术在发展过程中受到诸多不利条件的限制,导致新技术发展滞后,随着我国煤矿大力推进智能化建设,给煤矿坑道钻探装备技术带来了革命性的发展机遇。通过分析了国外坑道钻探装备的技术特点和发展状况,以及国内坑道钻探装备技术的三个阶段发展,包括初级阶段的分体式钻机与稳定组合钻具轨迹控制方法,蓬勃发展阶段的履带式钻机、定向钻进装备技术及松软煤层钻进技术,新发展阶段的自动化和智能化装备技术,提出了今后我国煤矿智能化发展阶段钻探装备技术需要解决的关键问题,为推进钻探装备技术的智能化水平提高提供支撑。     

灰色系统理论在航空像片模式识别中的应用

本文根据灰色系统理论,应用关联序分析,探讨了一种对航空像片进行林分类型识别的方法.该方法首先确定航空像片样区信息中反映林分类型空间分布结构特征的频谱光电流数据序列,然后确定标准识别对象频谱序列的模式,再根据关联序分析法计算待识别对象与标准识别对象间的关联程度,从而根据关联度的大小确定待识别对象的林分类型。