Charakterisierung bainitischer Gefügezustände in Schmiedestählen

Recent steel developments for highly dynamic loaded closed die-forgings illustrate a trend towards fine grained microstructures, which are formed directly by the forging temperature and which do not need any further heat treatment. Experiments are performed using three MnB-steel grades with different silicon contents. In order to estimate the thermodynamic data and transformation diagrams and to define reasonable test parameters, the software JMatPro is used. The isothermal transformation behavior at different temperature levels in the bainitic region is dilatometric determined using a Gleeble 3800 testing machine. The results provide a first overview on the formation of a fine microstructure and the expected mechanical properties. At transformation temperatures just above the M_s-temperature, strength values of almost 1000 MPa could be achieved, i.e. significant improved fatigue endurance can be expected. Due to the fine microstructure, excellent Charpy-V-toughness values are found.     

Deutscher Bergbau und seine Spannungsfelder – eine Außensicht

There is given a comprehensive overview on the mining sector in Germany. German mining sector is worldwide the No. 14, in Europe behind Russian Federation the No. 2 and within the European Union the No. 1 (produced mass of mineral raw materials, without construction materials). But European Union shares only about 4.73?% to the world mining production, while China, the USA and Russian Federation produce about 47?%. A useful European policy on mineral raw materials should not go beyond the big European mining companies.     

Nachhaltigkeitsmanagement – Forschung zum Thema ökologisch verträgliche, sozial verantwortliche und wirtschaftlich erfolgreiche Unternehmensführung

In this paper the development of the research area sustainability management is illustrated at the example of the Department for Economics and Business Management of the University of Leoben. The starting point is the discussion of the concept of sustainable development and its consideration in the development of business administration. For this purpose, different lines of development can be distinguished. Based on this starting point, the topics that were researched at the Department of Economics and Business Management are explained; especially the importance of assessment and evaluation for sustainability management as well as the linkages between sustainability management and other research areas are presented. Finally, the need for further research in the area of sustainability management is discussed by presenting future research topics.     

Identifikation von Verbesserungsmöglichkeiten des Förderbetriebes von Tagebauen mit Hilfe von Simulations- und Planungstechniken

Truck haulage is applied in many open pit operations and usually accounts for a significant ratio of total costs. The paper presents several measurement and analysis approaches applicable to regular operations to identify eventual potentials for improvements. For better illustration some data of such an exercise from the iron ore mine of VA Erzberg are given, which is the largest mining operation in Austria. For an expedient analysis the importance of a clear distinction between availability, utilization and technical efficiency is underlined. Discussed data analysis covers path geometry, overall cycle times, truck motion tracing and qualitative aspects. For prediction purposes the analysis must be extended on a simulation level. Prediction quality is significantly improved if the model is scaled and validated by measured results. Once established such a model can be particular helpful for mid- and long-term planning tasks, such as evaluating proposed geometric or organizational changes of hauling, or to assess the development of performance and costs in the future.     

Real time UAV altitude, attitude and motion estimation from hybrid stereovision

Knowledge of altitude, attitude and motion is essential for an Unmanned Aerial Vehicle during critical maneuvers such as landing and take-off. In this paper we present a hybrid stereoscopic rig composed of a fisheye and a perspective camera for vision-based navigation. In contrast to classical stereoscopic systems based on feature matching, we propose methods which avoid matching between hybrid views. A?plane-sweeping approach is proposed for estimating altitude and detecting the ground plane. Rotation and translation are then estimated by decoupling: the fisheye camera contributes to evaluating attitude, while the perspective camera contributes to estimating the scale of the translation. The motion can be estimated robustly at the scale, thanks to the knowledge of the altitude. We propose a robust, real-time, accurate, exclusively vision-based approach with an embedded C++ implementation. Although this approach removes the need for any non-visual sensors, it can also be coupled with an Inertial Measurement Unit.