内蒙赤峰鱼眼石矿物学特征及其水的赋存状态研究

采用显微镜和XRD,EMPA,FTIR,RAMAN,TGA等现代测试方法对内蒙赤峰鱼眼石的晶体形态、矿物组合、化学成分、谱学特征、热力学性质等进行了测试分析,初步探讨了鱼眼石晶体形态的成因以及水的赋存状态。赤峰鱼眼石晶体呈粒状—假立方状,由四方柱{100}、四方双锥{111}和平行双面{001}聚合而成,无色-浅粉红色,玻璃光泽,透明到半透明,与钙铁辉石、雪硅钙石和毒砂等矿物共生。赤峰鱼眼石的主要化学成分为w(SiO_2)50.22%~52.73%,w(CaO)24.16%~25.28%,w(K_2O)3.57%~5.80%和w(F)2.62%~3.48%,含有少量的Na_2O,Al_2O_3和Cr_2O_3,平均成分的晶体化学式为:(K_0.964Na_0.109)_1.073Ca_4.036[(Si_7.727Al_0.091Cr_0.073)_7.891O₂₀](F_0.828OH_0.172)_1.000·7.775H_2O。硅的含量不足导致硅氧四面体层活性氧与层间阳离子的键强增大,促使鱼眼石晶体沿c轴方向的生长,形成粒状—假立方状晶体形态。红外光谱中3 556 cm^-1和1 691 cm^-1吸收峰以及96.7℃,255.9℃,418.9℃,437.7℃的主要失水温度均表明赤峰鱼眼石中的水属于结晶水,而600℃以后仍有少量的失重,以及红外光谱中3 418 cm^-1和3 242 cm^-1吸收峰的出现,又反映出赤峰鱼眼石中部分水具有结构水的特点。     

内蒙古老道沟铜多金属矿床地质特征及流体包裹体研究

老道沟铜多金属矿床产于燕山早期闪长岩侵入体之中,为受断裂控制的蚀变破碎带-石英脉复合型矿床。矿区成矿早期以铜矿化为主,晚阶段以铅、锌和银成矿为主。流体包裹体研究结果表明,成矿早、晚阶段石英中均主要发育气-液两相流体包裹体,包裹体均一温度变化范围分别为226.9℃～298.5℃及179.3℃～265.4℃,盐度分别为5.26%～9.47%NaCl和2.57%～6.30%NaCl,表明成矿流体总体属中-低温、较低盐度热液体系,主要来源于岩浆热液及大气降水。根据矿化特征及流体包裹体研究结果综合分析认为该矿床属中-低温热液成因类型。     

基于ARM的指纹识别平台设计

设计了一种指纹识别实验平台,该硬件平台采用Atmel公司的AT9155800A(ARM7)芯片和ST公司的TFM2.0指纹传感器加以实现。该系统采用传统模糊模式识别技术与神经网络模型相结合的算法,即在提取指纹模板有效特征值的基础上,训练神经网络判别器进行指纹识别。     

Characteristics of Lightning Activity in Southeast China and its Relation to theAtmospheric Background

Based on the lightning observation data from the Fengyun-4A (FY-4A) Lightning Mapping Imager (FY-4A/LMI) and the Lightning Imaging Sensor (LIS) on the International Space Station (ISS), we extract the “event” type data asthe lightning detection results. These observations are then compared with the cloud-to-ground (CG) lightning observationdata from the China Meteorological Administration. This study focuses on the characteristics of lightning activity inSoutheast China, primarily in Jiangxi Province and its adjacent areas, from April to September, 2017–2022. In addition,with the fifth-generation European Centre for Medium-Range Weather Forecasts reanalysis data, we further delved into thepotential factors influencing the distribution and variations in lightning activity and their primary related factors. Ourfindings indicate that the lightning frequency and density of the FY-4A/LMI, ISS-LIS and CG data are higher in southernand central Jiangxi, central Fujian Province, and western and central Guangdong Province, while they tend to be lower ineastern Hunan Province. In general, the high-value areas of lightning density for the FY-4A/LMI are located in inlandmountainous areas. The lower the latitude is, the higher the CG lightning density is. High-value areas of the CG lightningdensity are more likely to be located in eastern Fujian and southeastern Zhejiang Province. However, the high-value areasof lightning density for the ISS-LIS are more dispersed, with a scattered distribution in inland mountainous areas and alongthe coast of eastern Fujian. Thus, the mountainous terrain is closely related to the high-value areas of the lightning density.The locations of the high-value areas of the lightning density for the FY-4A/LMI correspond well with those for the CGobservations, and the seasonal variations are also consistent. In contrast, the distribution of the high-value areas of thelightning density for the ISS-LIS is more dispersed. The positions of the peak frequency of the FY-4A/LMI lightning andCG lightning contrast with local altitudes, primarily located at lower altitudes or near mountainsides. K-index andconvective available potential energy (CAPE) can better reflect the local boundary layer conditions, where the lightningdensity is higher and lightning seasonal variations are apparent. There are strong correlations in the annual variationsbetween the dew-point temperature (Td) and CG lightning frequency, and the monthly variations of the dew-point tem perature and CAPE are also strongly correlated with monthly variations of CG lightning, while they are weakly correlatedwith the lightning frequency for the FY-4A/LMI and ISS-LIS. This result reflects that the CAPE shows a remarkable effecton the CG lightning frequency during seasonal transitions.     

运用数理统计方法研究东海南部陆缘晚第四纪硅藻与环境的关系

运用因子分析、对应分析、最优分割、聚类分析等多种数理统计方法，对东海南部陆缘(闽南段)6个柱状剖面的晚第四纪沉积硅藻进行了研究，以代表性的九龙江口ZK2井柱状剖面为例加以详细分析，得出了硅藻组合所反映的生态环境，恢复了该地区的古环境演替过程，即闽南九龙江口晚第四纪以来经历了河流、河口、河口内口、河口外口、河口外缘、河口外缘或海湾、河口内口等古环境演替过程。     

大气可吸入颗粒物解析技术研究进展

大气颗粒物源解析技术在环境管理中发挥着越来越重要的作用。本文从受体模型以及源解析技术发展的趋势两方面介绍了大气颗粒物源解析技术的研究进展。