1,017 research outputs found
[Rezension zu:] Schuppener, Georg (2014): Basiswissen Sprachgeschichte. Leipzig: Edition Hamouda. [Bibliothek Basiswissen] 94 S. ISBN 978-3-940075-90-1, Schuppener, Georg (2020): Basiswissen Varietäten des Deutschen. Leipzig: Edition Hamouda. [Bibliothek Basiswissen] 109 S. ISBN 978-3-95810-050-6
No full textRezension zu Schuppener, Georg (2014): Basiswissen Sprachgeschichte. Leipzig: Edition Hamouda. [Bibliothek Basiswissen] 94 S. ISBN 978-3-940075-90-1 ; Schuppener, Georg (2020): Basiswissen Varietäten des Deutschen. Leipzig: Edition Hamouda. [Bibliothek Basiswissen] 109 S. ISBN 978-3-95810-050-6
Characteristics of Intermetallic Compounds in Dissimilar Friction Stir Welding: A Review
No full textIn the present paper, mechanical and metallurgical characteristics of different dissimilar weldments fabricated by friction stir welding were investigated. Existence of lamellar composite structure within the stir zone in addition to observation of interfacial intermetallic compounds (IMCs) was the main characteristics that were investigated throughout this research. Results indicated that the optimum IMCs layers, resulting in enhanced mechanical properties, met three criteria, thinness, uniformity, and continuity
Buckling and crushing behavior of foam-core hybrid composite sandwich columns under quasi-static edgewise compression
No full textBuckling and crushing behavior of foam-core hybrid composite sandwich columns under edgewise compressive load is dealt in this study. Composite laminates with different stacking sequence configurations made of glass and Dyneema-woven fabrics and AL 2024-T3 sheets were used in combination of polyvinyl chloride foam core to manufacture the specimens. Effects of face sheet thickness and stacking sequence configuration, slenderness ratio, boundary conditions, and sandwich reinforcement with through-thickness resin pins on the buckling and crushing behavior of the specimens were investigated. The results revealed that using the resin pins changes the unstable Euler buckling mode to a more stable progressive end-crushing and significantly increases the buckling load, specific buckling load, and energy absorption capability, which are highly favorable. Also, the results showed that in the specimens with fiber metal laminates, the major failure modes are face sheet-core debonding and face sheet delamination. However, based on the results, specimen with hybrid face sheets made from Dyneema fabrics and aluminum plates has the highest buckling load as well as the highest specific buckling load. Also, a specific fixture was designed to laterally clamp the sandwich column which causes a reduction in the probability of specimen end-crushing and significantly increases the buckling load. - The Author(s) 2019.The publication of this article was funded by the Qatar National Library.Scopu
Comunitats d'aprenentatge : CEIP Amistat
No full textExposició dels principis i funcionament d'una Comunitat d'Aprenentatge i de les pràctiques que s' estan desenvolupant al CEIP Amistat de Figueres a càrrec d'una mare - Khadija Hamouda- i de dues mestres - Montserrat Ymbert i M. Jesús López- de l' Escola l' Amistat de Figueres. Conferència adreçada a l'alumnat de l'assignatura 'Organització del centre escolar', de 3r.curs dels Estudis de Mestr
Comunitats d'aprenentatge : CEIP Amistat
No full textExposició dels principis i funcionament d'una Comunitat d'Aprenentatge i de les pràctiques que s' estan desenvolupant al CEIP Amistat de Figueres a càrrec d'una mare - Khadija Hamouda- i de dues mestres - Montserrat Ymbert i M. Jesús López- de l' Escola l' Amistat de Figueres. Conferència adreçada a l'alumnat de l'assignatura 'Organització del centre escolar', de 3r.curs dels Estudis de Mestre2566.mp4
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Development of a virtual reality milling machine for knowledge learning and skill training
No full textCurrent methods of training personnel on high cost machine tools involve the use of both classroom and hands on practical training. The practical training required the operation of costly equipment and the trainee has to be under close personnel supervision. The main aim of this project is to reduce the amount of practical training and its inherent cost, time, danger, personal injury risk and material requirements by utilising a virtual reality technology.
In this study, an investigation into the use of Virtual reality for training operators and students to use the Milling Machine was carried out. The investigation has been divided into two sections: first the development of Milling Machine in the 3D virtual environment, where the real machine was re-constructed in the virtual space.
This has been carried out by creating objects and assembling them together. The complete Milling machine was then properly modelled and rendered so it could be viewed from all viewpoints.
The second section was to add motion to the virtual world. The machine was made of functions as for the real machine. This was achieved by attaching Superscape Control Language (SCL) to the objects. The developed Milling machine allows the users to choose the material, speed and feed rate. Upon activation, the virtual machine will be simulated to carry out the machining process and instantaneous data on the machined part can be generated.
The results were satisfactory, the Milling Machine was modelled successfully and the machine was able to perform according to task set. Using the developed Virtual Model, the ability for training students and operators to use the Milling Machine has been achieved
Investigation of mechanical properties of mwcnts doped epoxy nanocomposites in tensile, fracture and impact tests
No full textThe current paper was aimed to investigate the effect of addition of MWCNTs on mechanical properties of epoxy. Tensile, fracture and impact tests were carried out for mechanical characterization while the weight concentration of the MWCNTs was 0.5 wt.%. Results showed that addition of MWCNTs resulted in decreasing tensile strength of the nanocomposites, whereas an improvement appeared for fracture and impact tests. In fact, fracture toughness and impact strength of the MWCNTs/epoxy increased by 65 and 117 percentage, respectively, compared with the pristine epoxy
Investigation of the Temperature-Related Wear Performance of Hard Nanostructured Coatings Deposited on a S600 High Speed Steel
No full textThin hard coatings are widely known as key elements in many industrial fields, from equipment for metal machining to dental implants and orthopedic prosthesis. When it comes to machining and cutting tools, thin hard coatings are crucial for decreasing the coefficient of friction (COF) and for protecting tools against oxidation. The aim of this work was to evaluate the tribological performance of two commercially available thin hard coatings deposited by physical vapor deposition (PVD) on a high speed tool steel (S600) under extreme working conditions. For this purpose, pin-on-disc wear tests were carried out either at room temperature (293 K) or at high temperature (873 K) against alumina (Al2O3) balls. Two thin hard nitrogen-rich coatings were considered: a multilayer AlTiCrN and a superlattice (nanolayered) CrN/NbN. The surface and microstructure characterization were performed by optical profilometry, field-emission gun scanning electron microscopy (FEGSEM), and energy dispersive spectroscopy (EDS)
Alizarin red S dye removal from contaminated water on calcined [Mg/Al, Zn/Al and MgZn/Al]-LDH
No full textRae and the Tradition of Scottish Political Economy
No full textThe purpose of the chapter is to investigate how far Rae is representative of the Scottish Political Economy Tradition, where tradition is understood in terms of continuity in a shared approach, allowing for theoretical differences. While Rae conforms to most features identified with the Scottish tradition, his opposition to Smith’s methodology suggests a divergence of approach which would put him outside the tradition. It is argued here that this divergence applies only to Rae’s professed methodology, not to his practice
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