河台金矿床的控矿因素、矿化富集规律及找矿前景

河台金矿床是一产于韧性剪切带中的大型金矿床。该矿床位于南岭东西向复杂构造带中段南侧,属不同构造叠加复合部位。从该矿的矿床地质特征人手,根据多年的现场实际工作经验,并通过分析、研究前人多种地质工作成果,解析了地层、构造、岩浆岩、混合岩等控矿因素与成矿的关系,总结了矿化富集规律,预测了找矿前景。     

花生传送带作业精准定位方法研究

文章提出了一种面向花生类椭圆体目标,添加重心高度补偿的精准定位方法.该方法优化现场标定步骤,借助自制高精度标定块完成传送带平面标定,利用直接最小二乘法拟合花生椭圆轮廓曲线,重新校正短半轴图像信息,以传送带水平面为基准,映射到实际花生重心作出定位补偿.结果表明,该方法的平面定位精度优于1 mm,抓取成功率由87％ 提高至...     

Versuche am Bau mit Injektionsankern im Mauerwerk nach Technischer Regel des DIBt

Tests on construction site for metal injection anchors for use in masonry according to the DIBt Technical Rule – Part 1: Overview On construction sites, one encounters a large number of bricks that differ in material (clay, autoclaved aerated concrete, calcium silicate, lightweight concrete or normal concrete), structure (solid bricks, perforated bricks with or without insulation filling), geometry, bulk density and compressive strength. In the context of approval procedures for plastic anchors and metal injection anchors, however, it will only ever be possible for anchor manufacturers to map part of this variety of masonry stones as a permissible base material. Tests on construction site allow the user, under certain conditions, to design and install in accordance with the approval if the base material actual available on construction site is not shown in the approval for the anchor system. This article is an excerpt from issue 4 of the series of publications of the ?Deutscher Ausschuss für Mauerwerk e.V. (DAfM)” (Dübel‐)Versuche am Bauwerk in Mauerwerk – Aktuelle Regelungen für Kunststoffdübel und Metall‐Injektionsanker zur Verankerung im Mauerwerk” and provides an overview to the existing set of rules to be observed – in particular to one of the two current Technical Rules of the Deutsches Institut für Bautechnik (DIBt) ?Durchführung und Auswertung von Versuchen am Bau für Injektionsankersysteme im Mauerwerk”.     

Einbruchhemmung mit Mauerwerk aus Leichtbeton

Burglary resistance with lightweight concrete masonry The product palette of lightweight concrete blocks ranges from heavy, high‐strength blocks for internal walls, cavity walls and externally insulated (ETICS) external walls to lightweight, highly insulating blocks with lower density and lower compressive strength for monolithic external walls. In the German National Annex to EN 1627, suitable wall constructions for the installation of burglary‐retarding building elements are given. Masonry walls made of heavy, high‐strength blocks fulfil all requirements up to the highest resistance class RC 6. The installation of burglary‐retarding building elements in modern, highly insulating blocks for monolithic masonry is therefore not covered by the standard yet. At the institute for window technology in Rosenheim (ift Rosenheim), testing has been undertaken of the burglary resistance of building elements installed in monolithic masonry made of highly insulating lightweight concrete blocks. For the usual 365 mm thick lightweight concrete masonry units of compressive strength class 2 and density class 0.40 with a lightweight plaster of Type I, the burglary resistance class RC 2 (recommended by the police in Germany) was verified in all the investigated variants of blocks. The results of the research project have been implemented in a proposed change of the German National annex to DIN EN 1627.     

现代美声演唱中室内声学系统建设探究

本文根据美声演唱的具体需要,在分析了室内混响时间测量方式的基础上,以VRAS（可变室内声学系统）为例探究了室内声学系统建设的可行性及重要意义。