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Handlungsleitfaden Intracting an Hochschulen
(2021-09-28)
Ziel dieses Leitfadens ist es, durch die Darstellung methodischer Grundlagen und praktischer Erfahrungen die erfolgreiche Einführung und Anwendung von Intracting an Hochschulen zu unterstützen. Er richtet sich an Hochschulen, die ihre energetische Performance langfristig und kontinuierlich verbessern wollen. Eine Übertragbarkeit auf Kommunen ist weitestgehend gegeben.
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Food rescue and donation in socioenvironmental policies on tackling food loss and waste: a systematic review
(2021-12-20)
In recent years, there has been an increasing concern among governments about food loss and waste – FL&W and, in this context, the food rescue and donation – FR&D has emerged in the scenario of socioenvironmental policies as a strategic factor for FL&W reduction. Despite FR&D have potential to establish a “win-win” arrangement between the spheres of waste management and demands of food security, it still has been perceived as a less attractive alternative than forwarding the surplus food to the waste treatment system. ...
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Decontamination of Pineapple (Ananas comosus) juice using Ozone as a Non-thermal Sterilization method
(2021-12-15)
Ozone is a non thermal preservation technology used for enhancing shelf life and the safety of the food products. The objective of this study was to evaluate the effect of gaseous ozone on microbial decontamination and on some physicochemical characteristics (soluble solids content, pH, titratable acidity and color), bioactive compounds and total antioxidant activity of Pineapple juice. Ozone treatments were applied for Pineapple juice at 4 different exposure times as 15 mins, 30 mins, 45 mins and 60 mins at 250C and ...
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Effect of Crystallographic Orientation and Grain Boundaries on Martensitic Transformation and Superelastic Response of Oligocrystalline Fe–Mn–Al–Ni Shape Memory Alloys
(2021-07-26)
In situ tensile tests employing digital image correlation were conducted to study the martensitic transformation of oligocrystalline Fe–Mn–Al–Ni shape memory alloys in depth. The influence of different grain orientations, i.e., near-〈001〉 and near-〈101〉, as well as the influence of different grain boundary misorientations are in focus of the present work. The results reveal that the reversibility of the martensite strongly depends on the type of martensitic evolving, i.e., twinned or detwinned. Furthermore, it is ...
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Inklusive Erwachsenenbildung in der Alphabetisierung und im Zweiten Bildungsweg
(Weinheim, Basel, 2021-04)
Im Rahmen der BMBF-Förderlinie "Qualifizierung des pädagogischen Personals für Inklusive Bildung" untersuchen die Autoren in dem hier dargestellten INAZ-Projekt Gelingensbedingungen für Inklusive Erwachsenenbildung am Beispiel der Alphabetisierung und des Zweiten Bildungswegs. Erste deskriptivstatistische Ergebnisse einer bundesweiten Online-Fragebogenerhebung mit Kursleitenden an Volkshochschulen werden dargelegt und diskutiert.
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Shape Memory Effect and Superelasticity of [001]-Oriented FeNiCoAlNb Single Crystals Aged under and without Stress
(2021-06-10)
The two-step ageing of Fe-28Ni-17Co-11.5Al-2.5Nb (at.%) single crystals under and without stress, leads to the precipitation of the γ′- and β-phase particles. Research has shown that γ–α′ thermoelastic martensitic transformation (MT), with shape memory effect (SME) and superelasticity (SE), develops in the [001]-oriented crystals under tension. SE was observed within the range from the temperature of the start of MT upon cooling Mₛ, to the temperature of the end of the reverse MT upon heating Af, and at temperatures ...
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The Effect of Fiber Waviness on the Residual Stress State and Its Prediction by the Hole Drilling Method in Fiber Metal Laminates: A Global-Local Finite Element Analysis
(2021-01-15)
In this paper, fiber waviness, as one of the most frequently occurring defects in fiber reinforced composites, is numerically investigated with regard to the formation of residual stresses in fiber metal laminates. Furthermore, the prediction of the residual stress state in the thickness direction by means of the simulated hole drilling method is studied. To this regard, a global-local finite element analysis based on the submodel technique is presented. The submodel technique essentially consists of two governing ...
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Cyclic Crack Growth in Chemically Tailored Isotropic Austenitic Steel Processed by Electron Beam Powder Bed Fusion
(2021-11-01)
The present study analyzes the cyclic crack propagation behavior in an austenitic steel processed by electron beam powder bed fusion (PBF-EB). The threshold value of crack growth as well as the crack growth behavior in the Paris regime were studied. In contrast to other austenitic steels, the building direction during PBF-EB did not affect the crack propagation rate, i.e., the crack growth rates perpendicular and parallel to the building direction were similar due to the isotropic microstructure characterized by ...
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Tribological Performance of Additively Manufactured AISI H13 Steel in Different Surface Conditions
(2021-02-16)
Additive manufacturing of metallic tribological components offers unprecedented degrees of freedom, but the surface roughness of most as-printed surfaces impedes the direct applicability of such structures, and postprocessing is necessary. Here, the tribological performance of AISI H13 steel samples was studied. These were additively manufactured through laser powder bed fusion (L-PBF), also referred to as selective laser melting (SLM). Samples were tested in four different surface conditions: as-printed, polished, ...
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Overmoulding of Additively Manufactured Titanium Inserts Using Polyoxymethylene (POM)—Evaluation of Bond Quality as a Function of Process Parameters
(2021-06-15)
Due to their process-induced porous surfaces, additively manufactured structures are not optimized for applications in which friction is a key factor. To improve the frictional properties of additively manufactured titanium inserts of various thicknesses, two tribologically optimized POM materials, which differ in terms of filler composition and contents, were used to overmould the inserts. The titanium inserts were manufactured in two different building directions, resulting in a variation in surface roughness. The ...