硬石膏的粉磨改性研究

硬石膏的粉磨改性研究陈吉春毕晓平彭长琪（武汉工业大学，武汉４３００７０）关键词硬石膏材料改性建筑材料石膏建筑制品具有质轻、抗震、隔热隔音和可加工性（锯、刨、钉、钻孔）等优良特性，因而在建筑材料领域中占有重要的地位。并且，由于其质轻并整体性好，在高层建...     

NUMERICAL STUDY ON THE TIDAL FRONT IN THE WESTERN YELLOW SEA

The formation and evolution of the tidal front in the western Yellow Sea are studied by means of a two-dimensional model in which wind and tide mixing, sun radiation and wind stress, and realistic topography are incorporated. In this numerical study, the schemes employed are stable for time step t= 900 s, so the model can be run for 4 months to simulate the front evolution. The authors examined the effects of mixing and atmospheric forcing on the tidal front under conditions of : mixing and solar heating without wind stress on the sea surface; mixing, solar heating and 50 hours of wind stress; mixing, solar heating and long time periodical wind stress, Results show that (1) the tidal front forms at the beginning of May, and strengthens with the increasing of heat input, (2) the temperature structure in the shallow well-mixed water is dominated by mixing, while in the front and deeper stratified regions, it is controlled by the joint effects of (mainly) mixing and advection, 0) the currents and front all     

昭通褐煤中全水分含量的变化因素

作者对云南昭通矿区褐煤采取了129个样品进行了全水分测定,其含量为45.4％～61.89％.通过研究认为煤岩类型和煤化程度是影响褐煤中全水分(Mt)含量的主要因素,在煤岩类型基本相同的条件下,全水分含量受埋藏深度的控制.     

硅酸岩和化探样品中微量溴的催化—分光光度法测定

硅酸岩和化探样品中溴的含量甚微,一般在10ppm以下,这就要求有一个灵敏度较高的分析方法。一般的比色法和离子选择性电极法灵敏度太低,而灵敏度较高的中子活化法则又缺乏特殊装备不能应用。国外对利用动力学分析法测定溴的研究早有报导,1959年Shiota等用催化法在天然水中测定了微量溴。     

MATLAB工具箱在测绘数据处理中的应用

本文主要介绍了MATLAB工具箱的特点和功用。根据其在测绘领域的作用,对两个实例进行了分析,取得了良好的效果。相比其它编程工具,使用MATLAB工具箱大大简化了编程工作,同时获取了较高的数据处理精度,值得在测绘领域广泛应用。     

现代测绘学与测绘工程专业创新人才培养模式探讨

论述现代测绘学的技术体系、本质及其内涵，探讨新形势下测绘工程专业创新人才培养模式。确定全新的教育思想与教学目标，构建科学、合理的课程体系和培养方案。加强实践教学体系及教学模式的创新。     

基于MODFLOW的闭坑矿井水位回升预测

随着浅部煤炭资源枯竭及国家供给侧结构调整,我国闭坑矿井数量呈逐年增加趋势。矿井闭坑后停止抽排地下水,地下水位不断回升直至与区域地下水位平衡,会对邻近生产矿井产生威胁。以淮北闸河矿区岱河煤矿为研究对象,利用Visual MODFLOW软件对矿井闭坑后水位动态回升过程进行了预测分析。研究结果表明:矿井闭坑后,随着时间延长地下水位逐步回升,回升速度前期较快,后期减慢,揭示出区域地下水径流场对矿井水位回升具有明显的影响,得出了水位随时间动态变化过程,地下水回灌时间约2 000 d,研究结果为邻近生产矿井防治老空水提供了依据和参考。     

岩溶水文地质环境地质信息管理系统构建与实现

为服务地质调查数据管理需求,基于GIS平台,构建了岩溶地区水文地质环境地质信息管理系统,按标准对调查数据、空间数据进行集成整合,实现了岩溶数据资料信息的数字化、可视化、动态化管理。其系统主要功能模块包括调查数据管理模块、空间数据管理模块、数据核查管理模块、钻孔柱状图管理模块、基础数据管理模块、系统数据管理模块。      

Changes in phytoplankton communities along nutrient gradients in Lake Taihu: evidence for nutrient reduction strategies

An annual investigation on phytoplankton communities was conducted to reveal the effects of nutrients on phytoplankton assemblages in Lake Taihu,East China. A total of 78 phytoplankton taxa were identified. Phytoplankton biomass was higher in the northern part of the lake than in the southern part. Cyanobacteria and Bacillariophyta alternated dominance in the northern area,where algal blooms often appear,and co-dominated in the southern area. In the northern part,the proportions of cyanobacteria and Bacillariophyta varied significantly in total biovolume,both along the phosphorus(P) gradient,and between total nitrogen levels(≤3 mg/L and 3 mg/L TN). The proportions of cyanobacteria and Bacillariophyta had no signif icant variations in total biovolume along P and N(nitrogen) gradients in the southern part. Correlation analysis and CCA results revealed that P was the key factor regulating phytoplankton community structure. Nitrogen was also important for the phytoplankton distribution pattern. It was concluded that nutrient structure was heterogeneous in space and shaped the distribution pattern of phytoplankton in the lake. Both exogenous P and internally sourced Prelease needs to be considered. N reduction should be considered simultaneously with P control to efficiently reduce eutrophication and algal blooms.     

辽东青城子白云金矿床成矿期构造特征分析

辽东青城子金矿集区位于华北克拉通北缘东段古元古代辽吉裂谷带内,是我国重要的金富集区之一。白云金矿床是青城子金矿集区中具有代表性的矿床,其储量大、开采浅,具有较大的找矿潜力。通过野外勘察、井下观察、资料收集及室内测试等方法,并采用野外情况与室内分析相结合、宏观与微观相结合的研究方法,对矿体的分布形态、围岩蚀变及成矿期的构造特征进行了研究。研究表明：该矿床主要发育于辽河群盖县组云母片岩、变粒岩中,为热液蚀变岩型金矿床,矿体主要受断裂构造控制,主体走向为EW向,向南中等-低角度倾斜,呈舒缓波状,具有尖灭再现等特点;矿体围岩蚀变发育并受断裂控制,主要为硅化、绢英岩化、石墨化、绿泥石化等;导矿和容矿构造主要为近EW向逆冲断裂及其派生的次级构造。通过对成矿期控矿断裂解析及Au品位分布特征,厘定其成矿期构造应力场为NW-SE方向挤压,矿体向SW侧伏。