Subjects -> MINES AND MINING INDUSTRY (Total: 82 journals)
Showing 1 - 42 of 42 Journals sorted alphabetically
Applied Earth Science : Transactions of the Institutions of Mining and Metallurgy     Hybrid Journal   (Followers: 4)
Archives of Mining Sciences     Open Access   (Followers: 1)
BHM Berg- und Hüttenmännische Monatshefte     Hybrid Journal   (Followers: 1)
Canadian Mineralogist     Full-text available via subscription   (Followers: 5)
CIM Journal     Hybrid Journal  
Clay Minerals     Hybrid Journal   (Followers: 8)
Contributions to Mineralogy and Petrology     Hybrid Journal   (Followers: 11)
Environmental Geochemistry and Health     Hybrid Journal   (Followers: 2)
European Journal of Mineralogy     Hybrid Journal   (Followers: 12)
Extractive Industries and Society     Hybrid Journal   (Followers: 2)
Gems & Gemology     Full-text available via subscription   (Followers: 1)
Geology of Ore Deposits     Hybrid Journal   (Followers: 3)
Geomaterials     Open Access   (Followers: 2)
Geotechnical and Geological Engineering     Hybrid Journal   (Followers: 8)
Ghana Mining Journal     Full-text available via subscription   (Followers: 3)
Gold Bulletin     Hybrid Journal  
International Journal of Coal Geology     Hybrid Journal   (Followers: 2)
International Journal of Coal Preparation and Utilization     Hybrid Journal   (Followers: 1)
International Journal of Coal Science & Technology     Open Access   (Followers: 1)
International Journal of Hospitality & Tourism Administration     Hybrid Journal   (Followers: 14)
International Journal of Minerals, Metallurgy, and Materials     Hybrid Journal   (Followers: 8)
International Journal of Mining and Geo-Engineering     Open Access  
International Journal of Mining and Mineral Engineering     Hybrid Journal   (Followers: 5)
International Journal of Mining Engineering and Mineral Processing     Open Access   (Followers: 5)
International Journal of Mining Science and Technology     Open Access   (Followers: 4)
International Journal of Mining, Reclamation and Environment     Hybrid Journal   (Followers: 4)
International Journal of Rock Mechanics and Mining Sciences     Hybrid Journal   (Followers: 6)
Journal of Analytical and Numerical Methods in Mining Engineering     Open Access  
Journal of Applied Geophysics     Hybrid Journal   (Followers: 15)
Journal of Central South University     Hybrid Journal   (Followers: 1)
Journal of China Coal Society     Open Access  
Journal of Convention & Event Tourism     Hybrid Journal   (Followers: 4)
Journal of Geology and Mining Research     Open Access   (Followers: 11)
Journal of Human Resources in Hospitality & Tourism     Hybrid Journal   (Followers: 8)
Journal of Materials Research and Technology     Open Access   (Followers: 2)
Journal of Metamorphic Geology     Hybrid Journal   (Followers: 15)
Journal of Mining Institute     Open Access  
Journal of Mining Science     Hybrid Journal   (Followers: 2)
Journal of Quality Assurance in Hospitality & Tourism     Hybrid Journal   (Followers: 5)
Journal of Sustainable Mining     Open Access   (Followers: 2)
Journal of the Southern African Institute of Mining and Metallurgy     Open Access   (Followers: 5)
Lithology and Mineral Resources     Hybrid Journal   (Followers: 3)
Lithos     Hybrid Journal   (Followers: 9)
Mine Water and the Environment     Hybrid Journal   (Followers: 4)
Mineral Economics     Hybrid Journal  
Mineral Processing and Extractive Metallurgy : Transactions of the Institutions of Mining and Metallurgy     Hybrid Journal   (Followers: 11)
Mineral Processing and Extractive Metallurgy Review     Hybrid Journal   (Followers: 4)
Mineralium Deposita     Hybrid Journal   (Followers: 4)
Mineralogia     Open Access   (Followers: 2)
Mineralogical Magazine     Hybrid Journal   (Followers: 1)
Mineralogy and Petrology     Hybrid Journal   (Followers: 2)
Minerals     Open Access  
Minerals & Energy - Raw Materials Report     Hybrid Journal  
Minerals Engineering     Hybrid Journal   (Followers: 9)
Mining Engineering     Full-text available via subscription   (Followers: 5)
Mining Journal     Full-text available via subscription   (Followers: 3)
Mining Report     Hybrid Journal   (Followers: 2)
Mining Technology : Transactions of the Institutions of Mining and Metallurgy     Hybrid Journal   (Followers: 2)
Mining, Metallurgy & Exploration     Hybrid Journal  
Natural Resources & Engineering     Hybrid Journal  
Natural Resources Research     Hybrid Journal   (Followers: 8)
Neues Jahrbuch für Mineralogie - Abhandlungen     Full-text available via subscription   (Followers: 1)
Physics and Chemistry of Minerals     Hybrid Journal   (Followers: 4)
Podzemni Radovi     Open Access  
Rangeland Journal     Hybrid Journal   (Followers: 1)
Réalités industrielles     Full-text available via subscription  
Resources Policy     Hybrid Journal   (Followers: 4)
Reviews in Mineralogy and Geochemistry     Hybrid Journal   (Followers: 4)
Revista del Instituto de Investigación de la Facultad de Ingeniería Geológica, Minera, Metalurgica y Geográfica     Open Access  
Rock Mechanics and Rock Engineering     Hybrid Journal   (Followers: 6)
Rocks & Minerals     Hybrid Journal   (Followers: 2)
Rudarsko-geološko-naftni Zbornik     Open Access  
Stainless Steel World     Full-text available via subscription   (Followers: 17)
Transactions of Nonferrous Metals Society of China     Hybrid Journal   (Followers: 9)
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Journal Cover
BHM Berg- und Hüttenmännische Monatshefte
Number of Followers: 1  
 
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 0005-8912 - ISSN (Online) 1613-7531
Published by Springer-Verlag Homepage  [2469 journals]
  • Topology Optimized Unit Cells for Laser Powder Bed Fusion

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      Abstract: Abstract The rise of additive manufacturing has enabled new degrees of freedom in terms of design and functionality. In this context, this contribution addresses the design and characterization of structural unit cells that are intended as building blocks of highly porous lattice structures with tailored properties. While typical lattice structures are often composed of gyroid or diamond lattices, this study presents stackable unit cells of different sizes created by a generative design approach to meet boundary conditions such as printability and homogeneous stress distributions under a given mechanical load. Suitable laser powder bed fusion (LPBF) parameters were determined for AlSi10Mg to ensure high resolution and process reproducibility for all considered unit cells. Stacks of unit cells were integrated into tensile and pressure test specimens for which the mechanical performance of the cells was evaluated. Experimentally measured material properties, applied process parameters, and mechanical test results were employed for calibration and validation of finite element (FE) simulations of both the LPBF process as well as the subsequent mechanical characterization. The obtained data therefore provides the basis to combine the different unit cells into tailored lattice structures and to numerically investigate the local variation of properties in the resulting structures.
      PubDate: 2022-05-19
       
  • The Path from Arc Welding to Additive Manufacturing of Multi-material
           Parts Using Directed Energy Deposition

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      Abstract: Abstract Within this contribution, the transfer of knowledge from conventional fusion and deposition welding using electric arc processes to advanced directed energy deposition (DED) of multi-material structures in additive manufacturing are presented. Gas metal arc and plasma welding have been used for decades to produce either joints or metallic deposits with desired properties. Also creating certain shapes by depositing weld metal in a layer-wise manner has been known for approximately 100 years. With the rise of additive manufacturing, conventional arc welding processes have been extensively used to “print” 3‑dimensional parts. The possibility of additively manufacturing multi-material parts or transition parts is of particular interest as this has the potential to create load-efficient structures or even create new alloys within the AM process. Within this contribution, Wire Arc Additive Manufacturing (WAAM) and 3D Plasma Metal Deposition (3DPMD) for the manufacturing of multi-material and transition parts are discussed. The experience with various alloys from carbon steels, high-alloyed steels, and titanium- and nickel-based alloys are presented.
      PubDate: 2022-05-18
       
  • Potential Causes for Cracking of a Laser Powder Bed Fused Carbon-free
           FeCoMo Alloy

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      Abstract: Abstract Compared to hot isostatic pressing or casting, laser-based powder bed fusion (LPBF) facilitates a near-net-shape fabrication of geometrically complex tools leading to a strongly reduced post-processing time and effort and consequently lower costs. Conventional tool steels are, however, prone to cracking during LPBF due to their high carbon equivalent numbers. In contrast, carbon-free maraging steels promise an enhanced processability due to the formation of a soft martensite, which is subsequently hardened by the precipitation of intermetallic phases. A novel maraging steel for cutting applications (Fe25Co15Mo (wt%)) has been developed in recent years, and the present contribution deals with the processability of this novel alloy as a candidate for LPBF. However, severe cracking has been observed despite its low carbon content. The scanning electron microscopy revealed transcrystalline cleavage fracture plains on the crack surfaces. It is assumed that silicon oxide inclusions, which were verified by energy dispersive X‑ray spectroscopy, are responsible for the brittle failure. The electron backscatter diffraction analysis revealed coarse elongated grains, which may also contribute to cracking. The differential scanning calorimetry could not confirm an influence of brittle ordered FeCo domains that are potentially formed during cooling. In conclusion, solution approaches for the fabrication of crack-free parts are presented.
      PubDate: 2022-05-18
       
  • The Role of Pillars in Raise Caving

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      Abstract: Abstract Mining advances to greater depth, where the control of rock pressure is central for a successful operation. To handle the increasing rock pressure at LKAB’s Kiruna iron ore mine, LKAB and Montanuniversität Leoben develop a novel mining method called “raise caving”. Raise caving is based on an active stress management approach. De-stressing slots, which are separated by substantial pillars, are developed first and provide stress shadows for stope development and subsequent large-scale mineral extraction. At an advanced stage of extraction, these pillars are extracted, too. The pillars are decisive for the success of the raise caving method. They are responsible for the control of stresses, the stability of the hanging wall, and the control of seismic energy release. Hence, studies on pillars have a high importance. This contribution investigates the effect of pillar behavior on the overall extraction system by means of numerical simulations. Two different types for pillar behavior are examined, namely infinitely strong pillars and pillars which yield or crush in the process of extraction. In the second case, pillar stress strain curves are created and replicated numerically. The investigated behavior of pillars is based on available studies on the pillar stress strain behavior. Results show the importance of intact (not overloaded) pillars in the initial de-stressing phase in raise caving. These pillars are essential for controlling the stress levels at the position of the raise bore holes for the initial slot development. Pillar overloading results not only in an increase of the spatial extent of the stress shadow but also in a growth of stresses in the abutment areas and neighboring not yet overloaded pillars. It has been found that this instance can endanger the mining activities in the de-stressing phase. Furthermore, it has been found that the layout of the slot-pillar system together with the extraction sequence is decisive for ensuring that pillars are not overloaded in the de-stressing phase.
      PubDate: 2022-05-18
       
  • Untersuchungen zu Baufeldspannweiten in geklüftetem Gebirge

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      Abstract: Zusammenfassung Bestehende Berechnungsmodelle zur Abschätzung von Baufeldspannweiten im untertägigen Bergbau sind zumeist für bestimmte Gebirgssituationen ausgelegt. Für den Gebirgstypus, der hinsichtlich seines Verhaltens zwischen dem massiven und geklüfteten Gebirge liegt, sind bestehende Berechnungsansätze nur bedingt anwendbar. Es wird daher ein numerisches Balkenmodell erstellt, welches Aufschlüsse über mögliche Baufeldspannweiten für diesen Gebirgstypus geben soll. Eine grundlegende Parameterstudie soll aufzeigen, wie und wie schwerwiegend sich einzelne Einflussparameter auf die Baufeldstabilität und das Bruchverhalten auswirken. Hierfür werden Balkendruckversuche simuliert, wobei die Materialparameter, Trennflächenparameter sowie die Geometrie variiert und untersucht werden.
      PubDate: 2022-05-17
       
  • Neues von der Montanuniversität

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      PubDate: 2022-05-02
       
  • Neues aus der Industrie

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      PubDate: 2022-05-02
       
  • Der seismische Herdmechanismus von Gewinnungssprengungen

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      Abstract: Zusammenfassung Seit 2018 werden die seismischen Signale der Gewinnungssprengungen im Steinbruch Dürnbach/Hohe Wand/Niederösterreich mit Stationen des Macroseismic Sensor Netzwerkes beobachtet und aus den Messdaten Magnituden als Maß für die Quellstärken der jeweiligen Sprengungen bestimmt. Gleichzeitig werden spreng-technisch relevante Parameter in einer Datenbank mitgeführt. Der vorliegenden Untersuchung liegen die Daten aus den Jahren 2019, 2020 und 2021 zugrunde. Die Mittelwerte der Magnituden für die drei, im Abbau verwendeten Sprengschemata beschreiben die beobachteten Quellstärken geringfügig besser als der lineare Zusammenhang von Magnitude und dem Logarithmus der maximalen Lademenge pro Zündstufe (Lmax). Im Abbaugebiet wurden auch drei seismische Sprengungen zum ausschließlichen Zweck der Erzeugung seismischer Wellen abgetan. Die Magnituden der seismischen Sprengungen lagen lediglich im Bereich der Gewinnungssprengungen mit gleicher Lmax und nicht, wie erwartet, deutlich darüber. Die offensichtliche Bedeutung des Sprengschemas und die letztgenannte Beobachtung veranlasste uns zu einem Überdenken des seismischen Herdmechanismus von Gewinnungssprengungen. Einzelkraft und Kräftepaar stellen die beiden in der Seismologie etablierten Herdmechanismen dar. Beispiele für Einzelkraft als Quelle bilden Fallgewichte, Vibratoren oder Bergstürze. Kräftepaare sind bei seismischen Sprengungen, unterirdischen Nuklearexplosionen oder Erdbeben wirksam. Wir veranschaulichen den in der Theorie gesicherten Sachverhalt, dass der Betrag der Kräfte beim Herdmechanismus „Kräftepaar“ wesentlich höher sein muss als bei einer Einzelkraft mit gleicher Quellstärke. Für den Herdmechanismus einer Gewinnungssprengung gelangen wir zu folgendem Modell: Unmittelbar nach der Detonation des Sprengstoffs wirkt eine Gewinnungssprengung als seismische Sprengung mit dem Herdmechanismus „Kräftepaar“. Mit dem Erreichen der Zugfestigkeit des Gebirges und der Abtrennung der zu gewinnenden Gesteinsmasse wechselt der Herdmechanismus von Kräftepaar auf Einzelkraft. Dabei erhöht sich die seismische Quellstärke der Gewinnungssprengung bei annähernd gleichbleibenden Kräften etwa um den Faktor 102. Der Rückstoß, den das abgesprengte und stark beschleunigte Gebirge nach dem Prinzip „actio + reactio = 0“ auf die Bruchwand ausübt, wirkt nun als seismische Quelle im Sinne einer Einzelkraft. Die Wirksamkeit des Herdmechanismus „Einzelkraft“ im Vergleich zu Kräftepaar macht verständlich, dass die zur ausschließlichen Erzeugung seismischer Wellen konzipierten seismischen Sprengungen keine höheren seismischen Quellstärken liefern als die Gewinnungssprengungen. Über die Modellierung der Wurf- und Ablagerungsphase des Hauwerks gelangen wir zu repräsentativen Werten der in der Beschleunigungsphase erlangten Geschwindigkeiten v1 für die drei Sprengschemata. Wir zeigen, dass der Impuls, den die abgesprengte Gesteinsmasse in dieser kurzen Beschleunigungsphase gewinnt, der seismischen Quellstärke der Gewinnungssprengung entspricht und die Magnitude bestimmt. Der Impuls folgt aus dem Produkt von Abschlagsmasse pro Zündstufe mit der Geschwindigkeit v1 und stellt eine beobachtbare Größe dar.
      PubDate: 2022-05-02
       
  • Editorial

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      PubDate: 2022-05-01
       
  • Handbook on Knowledge-based Lubricant Selection for Production in the
           Steel Industry

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      Abstract: Abstract Lubricants are widely used in the industry to maintain the proper working conditions of machinery and to guarantee the availability of production equipment. Selecting the correct lubricant is essential for maintaining production, preventing unplanned downtimes, for example those due to breakage of a component, and protecting machine functionality. This contribution addresses the differences between the various lubricants and their most important selection parameters.
      PubDate: 2022-05-01
       
  • Considerations on Copper Smelting from Fahlores and the Metallurgy of
           Cu-As Bronzes

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      Abstract: Abstract The copper production in the Alps began three thousand years BC, usually near ore deposits in Austria and Switzerland. For copper smelting, sulphidic ores like chalcopyrite and fahlores were used. Copper produced from fahlores was widely used in the Alps resulting in As and Sb contents in the metallic copper. Such copper alloys were generally referred to as arsenical bronzes. However, in ancient bronze objects, a wide range of arsenic content was observed. One question relates to how much arsenic is transferred into the bronze alloy during smelting. By thermodynamic equilibrium calculations, the roasting and smelting processes are simulated and show that As reacts already to gaseous As compounds before Cu2S is attacked and metallic Cu is formed. In case of Sb liquid, Sb2O3 is formed quickly during roasting and is finally enriched in the slag. These results have been confirmed by the investigation of an ancient copper ingot containing 4 wt. % As and 2.5 wt. % S as well as smaller quantities of Sb, Ni, Fe, and Ag. The main phases apart from metallic copper are Cu3As, Cu2S, and Sb oxide. In a slag sample, an inclusion was characterized containing chalcopyrite, FeO, and Sb oxide This result is in accordance with the thermodynamic calculations where Sb2O3 was obtained. Another interesting point is the As loss of arsenical bronzes during remelting. Thermodynamic equilibrium calculations reveal that Cu3As is very stable and during remelting no evaporation of As is observed. Moreover, during oxidation of metallic Cu-As, the formation of Cu2O is favoured from Cu and not from Cu3As. Consequently during melting of Cu-As for casting, at first Cu2O is formed resulting in an As enrichment in the melt and in the casted object, respectively. These effects are superimposed and, if recycled Cu alloys are used, the starting concentration of As is unknown.
      PubDate: 2022-04-20
       
  • Lubrication of Rolling Bearings

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      Abstract: Abstract This contribution covers the basics of lubrication of radial and axial rolling bearings. During the rotational operation of a bearing, the lubricant gets sheared between the surfaces in contact. The shear stresses are generating a hydraulic pressure that separates the surfaces and saves them from wear. This requires a certain viscosity of the lubricant. A common equation for the calculation of a required viscosity is introduced. This is a basis for a proper lubricant selection. Furthermore, the rheology of greases and their key characteristics for bearing lubrication are discussed. Afterwards the basics of bearing life calculation and the impact of the properties of the lubricants are presented. Furthermore, the typical applications of lubricants in rolling bearings in steel industry are discussed. Finally, an outlook on the latest trends of rolling bearing lubrication is given.
      PubDate: 2022-04-14
       
  • High Performance Greases for Steel Rolling Processes

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      Abstract: Abstract Lubricating greases are commonly used in machine elements due to easy applicability and overall good performance. As the machinery is exposed to harsh environments, contaminations of the greases are common and may influence the overall performance of the lubricating grease and hence maintenance. In this article the focus lies on water contamination and its effects on grease performance and lifetime in calcium-sulfonate-complex greases. To generate a better understanding of grease-water interaction, basic grease properties such as water absorption and retention were investigated. Further research was conducted on the effects of water on roll stability using a standardized approach in a shear stability tester. The approach was modified to assess the changes after a prolonged time-period. Wear properties were investigated on a four-ball test rig. Lastly the corrosiveness and degradation on grease were investigated on different metal surfaces. The studies carried out provide a better understanding of the effects of water contamination on a wide range of grease properties. The overall performance of the investigated calcium-sulfonate-complex greases is good regarding water contaminations. A significant decrease in performance was only observed at very high water content. Further research on water contaminations will be conducted in future studies using the information gathered in this work as a baseline and reference for other lubricating greases.
      PubDate: 2022-04-12
       
  • Coal Tar—Special Oils in Steel Industries Using the Example of
           Gasholder Sealing Fluids

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      Abstract: Abstract The safety of gasholders relies on the reliability of the sealing concept, which usually applies a liquid seal. In the case of a viscosity increase of the sealing medium, the risk of a gas breakthrough multiplies, which must be prevented at all costs. Monitoring of sealing fluid samples from field usage in combination with laboratory tests of model mixtures were used to identify safety influencings variables. Water has proven to be the main factor responsible for most adverse property changes. It acts in both ways, directly altering the liquid’s properties and indirectly promoting corrosion. Hence, water separation is one of the key parameters of the liquids. An adapted method for the determination of water separability was established and the findings from the field monitoring were used to set up a test matrix for further investigations. The findings of this point out the key influencing factors determining the usability of sealing fluids and are applied for improving the liquids by targeted testing methods.
      PubDate: 2022-04-11
       
  • Influence of Lubricant Properties on the Electrical Isolation in Binding
           Machines

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      Abstract: Abstract When using lubricants in binding machines, the isolation properties of the used lubricants are essential for a failsafe operation of the spot-welding process. Lubricants are applied to the sliding plates to ensure low-friction infeed of the spot-welding arm. In case of over-lubrication, a current transfer results in a reduced functionality of the spot-welding process. Therefore, the isolation properties of the used lubricants have to be considered. The measurement of the isolation resistance and the dielectric strength is suggested for the selection of a proper lubricant. Within this contribution, the isolation properties of thin lubricant film contacts were systematically investigated by measurement of the isolation resistance and dielectric strength. The influence of temperature and humidity present in the insulation fluids and the dependency of the measurement voltage and electrode distance are discussed. The benchmark of a selection of different lubricants clearly indicated the importance of choosing the right lubricant for the specific application.
      PubDate: 2022-04-09
       
  • Process-safe Operation Requirements of Cooling Lubricants

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      Abstract: Abstract Cooling lubricants are used to improve the process and result of machining activities. Specifically, they are designed to increase cutting performance, extend tool life, improve the surface of work pieces, and reduce cutting forces. Simultaneously, cooling lubricants must also lubricate, cool, and flush. The requirements for corrosion protection, bacterial resistance, foaming behaviour, machine compatibility, ease of care, and health compatibility for humans must also be met. The aim of this contribution is the establishment of a simple measurement for the determination of excessive salt content in used cooling lubricants. A high emphasis was put on the reliable evaluation of the correlation of excessive salt content with the limit values specified by manufacturers.
      PubDate: 2022-04-08
       
  • Improvement of Work Safety and Reduction of Environmental Issues with Fire
           Resistant Lubricants in Steel Plants

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      Abstract: Abstract Fire hazard in the steel industry is not a new topic, and the steel industry is taking any possible efforts to lower the fire hazard in its production plants. Fire hazard is present in several different forms, but fires induced and intensified by mineral oil based lubricants are notorious and feared. For hydraulic fluids, gear oils, and greases, several alternatives are available. This contribution explains typical examples in steel plants for successful conversions and the impact on safety and the environment. In addition, the contribution describes what change can be made to the choice of lubricants to get to a situation with a significant reduced risk, enhanced work safety, and a secured productivity in casters, rolling mills, and auxiliary equipment.
      PubDate: 2022-04-07
       
  • Neues von der Montanuniversität

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      PubDate: 2022-04-05
       
  • Vorwort des Editor in Chief:

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      PubDate: 2022-04-04
       
  • Erratum zu: Editorial

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      PubDate: 2022-03-15
       
 
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