Chemie Ingenieur Technik最新文献

As a young class of socio-technical systems, Augmented Reality (AR), which enriches the real world with virtual information, is becoming increasingly important. It offers a variety of possibilities in the areas of education and training. Here, interactive and immersive learning experiences increase motivation and learning success. AR also enables the specific support of workers in the production environment. When dealing with complex tasks, AR applications help workers to increase efficiency and quality. Based on the developments of the BMBF collaborative project KORESIL, this paper contains an overview of the current application scenarios of AR in teaching and industry. The outlook provides an analysis of this technology's potential and identifies current challenges in hard- and software.

The water content is an essential parameter for assessing the quality of solid biofuels. In terms of economic, technical and environmental aspects a continuous determination of the solid fuel water content is sought. This article investigates the use of microwave technology for the continuous measurement of fuel water content. For this purpose, a microwave sensor was evaluated with five different types of wood chips (forest residues, beech, pine, and ash). The results of the online measurements showed a strong correlation with the reference method r < 0.9 for most materials. This means that continuous water content determination of wood fuels using microwave technology is fundamentally possible.

Copyright: Fraunhofer UMSICHT

To adapt to changes in digital transformation and related Learning and Working 4.0, laboratories in engineering education must leap forward and employ well-thought-out pedagogical designs. This includes digital laboratories that in return change social dynamics and interaction patterns of students. This contribution takes the first step of examining gender-specific teamwork and leadership of groups conducting a digital laboratory in fluid mechanics. Self and external evaluation of perceived teamwork of team members (TMs) and leaders (TLs) was analyzed. Furthermore, possibilities for improvements were evaluated. A mixed-methods analysis was performed with respect to gender and role to assess whether differences occur. Conclusions show considerable homogeneity between genders and roles and identify communication as most important point of improvement.

Im Herbst wird es spannend für die Chemie-Community: Die Gesellschaft Deutscher Chemiker (GDCh) zeichnet wieder zahlreiche Wissenschaftlerinnen und Wissenschaftler für außergewöhnliche Leistungen und besonderes Engagement aus. Die Preisverleihungen finden im feierlichen Rahmen verschiedener Tagungen statt. Im Folgenden stellen wir einige der Preisträger vor. Weitere Preisträgerinnen und Preisträger folgen in der kommenden Ausgabe.

Light-emitting diodes (LED) are widely used for energy savings. A lot of different materials and especially metals are needed to produce LED. End-of-life LED contain critical metals like indium or rare earth elements. In this study, first a thermochemical step is used to recover the critical metal indium from LED with hydrochloric acid-containing vapor from polyvinyl chloride as chlorine source. Then, the LED residue is leached with sulfuric acid and hydrogen peroxide. From the leachate, the heavy rare earth element lutetium can be extracted with n-octanol and tributyl phosphate.

Mixing in biogas fermenters is complex due to the non-Newtonian rheology of biogenic substrates, which exhibit both pseudoplasticity and elasticity. It is yet unclear how these non-Newtonian properties affect propeller flows and the mixing behavior in fermenters. Therefore, propeller flows in Newtonian as well as shear-thinning inelastic and elastic fluids are compared numerically and validated against particle image velocity (PIV) data. Elastic normal stresses lead to an increase of pumping rates in the laminar regime and a suppression of the formation of a propeller jet in the transitional regime. Thus, flow rates are severely overestimated by the inelastic, shear-thinning model in this regime. The results indicate that elasticity is critical for an accurate modeling of flows of biogenic substrates.