基于特征库的矿山三维实体建模

为了促进实体建模技术在矿山行业的应用,提出了一种基于特征库的矿山三维建模策略。首先介绍了建立矿山三维实体模型的通常步骤,然后介绍了基于特征库的矿山三维实体建模步骤。可以看出,基于特征库的矿山三维实体建模策略能显著地简化矿山建模的过程,提高矿山三维建模的速度。     

三维地质建模综述

全球各国对矿产资源的需求日益增加,以至于越来越多的国家和研究中心对三维建模方向给予了高度关注,三维建模技术可以帮助我们更加直观的对复杂的地质结构进行观察,设计及管理,因此对三维建模技术的建模精度,效率和开发更能接近真实地质构造模型的软件平台和方法就尤为重要.虽然三维建模技术目前还存在不足,但经过不断发展,也取得了很大的...     

地质工程复杂地质体可视化技术研究

对复杂地质工程地质体的探测是很重要的工程,包括对地表地形、地下水、地层结构等数据的搜集和分析,测得的数据量大、涉及范围广、信息整理很繁琐。针对上述问题,提出地质工程复杂地质体可视化技术研究,分析了复杂地质体工程的可视化技术,研究了三维建模技术问题,探讨了地质工程三维建模和可视化技术的应用。     

无人机倾斜摄影测量在三维建模中的应用研究

三维数字模型能够客观形象的反应地形地物的客观特征。综合分析了使用基础数据、遥感影像、三维激光扫描和过程数据的三维建模方法。介绍了无人机倾斜摄影测量系统的组成,以及使用倾斜摄影测量技术进行三维建模的流程,并分析了三维建模过程中需要注意的问题。将无人机与倾斜摄影测量技术相结合,发挥无人机机动灵活、空域限制小、高效快速、成本低廉的特点和倾斜摄影测量技术快速准确、自动化程度高的特点,可以极大地促进实景三维建模技术的发展。     

基于密井网条件的沉积相控地质建模研究

在研究区密井网及6口取心井的基础上,应用沉积相控地质建模技术对杏树岗油田杏六区东部葡萄花油层的葡Ⅰ211和葡Ⅰ323两个小层进行了建模研究。首先结合细分沉积单元和细分沉积微相数据库,完成了研究层位地层格架的建立及沉积微相图的绘制。在层面构造模型的基础上,采用确定性算法建立了各小层沉积相模型。以微相边界为约束,序贯高斯随机模拟为方法,通过分层分微相变差函数的拟合,模拟出了各小层属性(孔隙度、渗透率)模型。通过微相模型与孔渗模型的平面对比知,相控属性模拟结果充分体现出了储层及其内部属性参数相内的相似性和相间的差异性,有效地表征了储层平面非均质性的变化特征。孔渗属性模型垂向模拟结果与对应取芯地质特征的高度吻合,则进一步精细刻画出了厚油层内部的垂向非均质性。模拟结果表明:相控建模技术的科学性与合理性,对后续的油藏数值模拟及油田开发方案的调整具有一定的指导意义。     

基于地质与重磁数据集成的栾川钼多金属矿区三维地质建模

三维地质建模是当前国内外矿产资源勘查与评价研究的重要途径和热点.以栾川钼多金属矿区为例.针对研究区地质背景复杂、成矿地质条件多样性特征,开展了基于地质(岩性地层及其物性特征、地质体产状数据)与重磁正反演集成技术组合的三维地质模型建模研究,其研究内容为:(1)根据研究区地质背景和成矿条件.确定研究区矿床地质特征以及近地表地质体的空间属性特征;(2)利用重磁数据,在定性解译地质信息的基础上.开展二度半正演方法定量解译研究,并运用三维位场概率成像方法反演和解译深部地质体;(3)根据研究区地质与重磁反演解译资料综合分析,确定晚侏罗世斑岩岩体和控矿构造的时一空一因关系.研究结果表明,基于地质岩性属性特征的重磁正反演联合解译,能够综合利用地质体之间的物性差异、成因关系界定其几何形态,从而在三维环境中建立它们的时空关系,即三维地质模型,为研究区深部找矿、矿体定位预测以及金属矿产资源定量评价提供技术支撑和新途径.     

矿山地形实景三维建模中倾斜摄影测量技术的应用分析

在数字化信息技术时代,三维建模技术得到了广泛发展与高效应用。基于三维建模的矿山地形实景测量技术,在很大程度上成为了直接影响我国矿业领域资产数据采集和与矿产资源评估工作的关键性因素。本文以矿山地形实景三维建模技术的实践化应用作为主要研究对象,利用倾斜摄影测量技术、设备选型与技术参数的优化设计,实现了基于网格化的矿山地形实景三维虚拟仿真建模。矿山地形实景数字化数据信息的采集与倾斜摄影测量技术的合理应用,能够为矿山地质测绘提供更加科学有效的测量技术支持,并能够在大数据信息技术的辅助作用下,实现对我国矿山地形实景的高清、高真三维建模,进而促进我国矿山相关行业的数字化、智能化与信息化发展。     

BIM技术在矿山钢结构施工管理中的应用

对BIM技术的特点及优势作了总结,简述了矿山钢结构工程施工的特征,重点对建模管理、工程量管理、项目成本管理、施工数据管理等内容进行了介绍。通过加强BIM技术在矿山钢结构施工管理中的应用,可提高工程施工质量,缩短施工工期,增强企业经济效益。     

基于倾斜摄影测量技术的矿山地形实景三维建模研究

由于原有三维建模方法建立了矿山地形实景三维模型分辨率较低,为此提出基于倾斜摄影测量技术的矿山地形实景三维建模研究。通过对测量仪器设备选型以及技术参数设定,利用倾斜摄影测量技术对矿山地形实景三维数据进行采集;对采集到的数据进行归一化处理,为三维模型建立提供数据支持;采用GeoIPAS V3.2软件对数据进行网格化生成,以此完成矿山地形实景三维建模。经实验证明,此次提出的建模方法建立的三维模型分辨率高于传统方法。     

地下铲运机自主铲装技术现状及发展趋势

为提高地下铲运机铲装效率及作业精度,实现铲运机全自动作业,梳理了国内外地下铲运机自主铲装技术的相关理论技术和研究方法,并从环境感知与建模、铲斗轨迹控制和自动称重3个方面对铲装过程的研究成果进行了归纳总结。研究结果表明：当前环境感知与建模技术难以同时满足速度和精度的要求,存在铲斗轨迹控制难度大以及自动称重技术研究不全面等问题。研究多传感器信息融合技术,人工智能技术,以及适用于地下的通信网络是实现铲运机自主铲装的前提,也是未来开展该领域研究的重要方向。     

Benzimidazole resistance in cyathostomes in horses in the Ukraine

The efficacy of treatment with cambendazole was tested in 1-year-old horses on a farm in Dubrovka, Ukraine. Thirty-five horses were treated. Their egg output was compared on the day of treatment and 14 days later with that of 33 untreated horses. Before treatment the mean number of eggs g-1 faeces was 614 in the controls and 766 in horses that had been treated. After 14 days the mean egg output in the controls was 580 and in the treated horses 369. This means a reduction of 54.5%. Only cyathostome larvae could be cultured from faeces collected after treatment. It can be concluded that benzimidazole resistance in cyathostomes is present in the Ukraine.     

重庆高校推进产学研合作的案例分析

以重庆大学、重庆邮电大学和重庆理工大学为例,剖析重庆高校推进产学研合作的基本模式,已经取得的突出成绩,分析总结其基本经验.从完善政策法规体系、强化经济调控、建立组织机构、加强中介建设及开展国际产学研合作等方面,提出了深入推进重庆高校产学研合作的对策建议.     

Apoptosis in experimental myocardial infarction in situ and in the perfused heart in vitro

We report the appearance of apoptotic cells in experimental myocardial infarction (rabbit heart) in in situ and in vitro preparations. Apoptosis was recognized by intravital staining with Hoechst 33342 (Ho342), by nick-end labeling (TUNEL) and by DNA laddering. A steady rise in the relative number of apoptotic cardiomyocytes (apoptotic index) was noted in in situ preparations. Apoptosis was first noted 6 h after the onset of ischemia with its highest value occurring after 72 h. Apoptotic nuclei were absent in remote areas of the left and right ventricles. Apoptotic nuclei within the infarcted area showed diminished intensity of Ho342 fluorescence. Three days after ischemia, a border zone adjacent to the infarcted area consisting of apoptotic macrophages was recognized. A novel finding was the appearance of apoptotic cardiomyocytes in the isolated perfused ischemic heart. Occurring as early as 50 min after the onset of ischemia, a high apoptotic index was present adjacent to the ligature placed around the coronary artery. This observation provides the opportunity to selectively examine factors leading to apoptosis in the ischemic heart under controlled experimental conditions.     

Fractures in childhood in Khartoum

A prospective study of fractures in 231 children received at Khartoum North Teaching Hospital(KNTH) was carried out for a period of six months. The incidence of child fracture rated as one per day, then it increased from the age of 5 years onwards in boys and between 6 and 8 years in girls. Most injuries were sustained during the day time, especially between late afternoon and sunset. 82% of injured children presented to a medical facility, while 18% were taken to native healers first. Non-road traffic accidents accounted for 84% of the fractures mainly due to sports, domestic injuries and falls; whereas road traffic accidents were 16% and occurred mainly in pedestrians. Forty three percent of the fractures needed only first aid and splintage while 42% needed closed reduction. Thirty one percent of all patients were treated as inpatients. The long bones were affected in 91% of all fractures, the commonest site being the distal end of the forearm (26%), followed by supracondylar fracture of the humerus (15.6%). In the upper limb, left-sided fractures predominated. The epiphyseal injuries were 3.5% of all fractures, mainly at the distal radial epiphysis. Boys were commonly affected between 13-15 years of age. Open fractures constituted 9.8% of the series and were mainly due to traffic accidents in town dwellers, the most vulnerable bones were those of the leg and foot. Pathological fractures accounted for 2.2% and were due to bone cysts and osteogenesis imperfecta. The problem of child safety and the preventive measures need to be more stressed.     

Botulism in Poland in 1996

A model is presented in which ion translocation through the F0 part of the ATP synthase drives the rotation of the ring of c subunits (rotor) versus the a subunit (stator). The coupling ion binding sites on the rotor are accessible from the cytoplasm of a bacterial cell except for the c subunit at the interface to the stator. Here, the binding site is accessible from the periplasm through a channel formed by subunit a. In the ATP synthesis mode, a coupling ion is anticipated to pass through the stator channel into the binding site of the adjacent rotor subunit, following the electrical potential. Occupation of this site triggers, probably by electrostatic forces, the rotation of the ring. This makes the binding site accessible to the cytoplasm, where the coupling ion dissociates. Simultaneously, this rotation moves again an empty rotor subunit into the contact site with the stator, where its binding site becomes loaded and rotation continues.     

Problems in falling in love

Certain patients enter psychoanalysis because of their inability to love another person. Often they report a repetitive erotic pursuit of desired partners, without being able to experience or maintain loving feelings. Kernberg has understood such difficulties as representing effects of early narcissistic disappointments and/or of difficulties in resolving oedipal conflicts. In this paper, Lacanian concepts of the mirror phase and symbolic love are employed to develop these issues. Sexualization of problems in mirroring may be fused with oedipal conflicts in some cases. An extended vignette is presented to illustrate the technical and theoretical issues.