Refine
Year of publication
- 2018 (267)
- 2022 (262)
- 2019 (260)
- 2023 (243)
- 2017 (239)
- 2016 (238)
- 2015 (234)
- 2020 (229)
- 2021 (228)
- 2013 (199)
- 2014 (192)
- 2012 (141)
- 2011 (107)
- 2010 (99)
- 2009 (62)
- 2008 (41)
- 2006 (35)
- 2004 (34)
- 2007 (34)
- 2005 (31)
- 2001 (22)
- 1995 (17)
- 2024 (15)
- 2002 (14)
- 2003 (14)
- 2000 (10)
- 1997 (8)
- 1998 (8)
- 1990 (7)
- 1994 (7)
- 1993 (6)
- 1999 (6)
- 1996 (5)
- 1986 (4)
- 1992 (4)
- 1982 (3)
- 1988 (3)
- 1989 (3)
- 1991 (3)
- 1983 (2)
- 1987 (2)
- 1972 (1)
- 1977 (1)
- 1984 (1)
Document Type
- Conference Proceeding (1089)
- Article (unreviewed) (558)
- Article (reviewed) (529)
- Part of a Book (454)
- Book (222)
- Other (138)
- Contribution to a Periodical (123)
- Patent (94)
- Report (62)
- Letter to Editor (30)
Conference Type
- Konferenzartikel (856)
- Konferenz-Abstract (153)
- Sonstiges (40)
- Konferenz-Poster (31)
- Konferenzband (13)
Language
- German (1734)
- English (1595)
- Other language (5)
- Russian (3)
- Multiple languages (2)
- French (1)
- Spanish (1)
Has Fulltext
- no (3341) (remove)
Keywords
- Digitalisierung (39)
- RoboCup (32)
- Dünnschichtchromatographie (26)
- Arbeitszeugnis (22)
- Finite-Elemente-Methode (22)
- Energieversorgung (21)
- Kommunikation (21)
- Management (19)
- Industrie 4.0 (18)
- Machine Learning (18)
Institute
- Fakultät Maschinenbau und Verfahrenstechnik (M+V) (786)
- Fakultät Medien und Informationswesen (M+I) (bis 21.04.2021) (717)
- Fakultät Elektrotechnik und Informationstechnik (E+I) (bis 03/2019) (704)
- Fakultät Wirtschaft (W) (559)
- Fakultät Elektrotechnik, Medizintechnik und Informatik (EMI) (ab 04/2019) (390)
- INES - Institut für nachhaltige Energiesysteme (178)
- Fakultät Medien (M) (ab 22.04.2021) (173)
- ivESK - Institut für verlässliche Embedded Systems und Kommunikationselektronik (133)
- IMLA - Institute for Machine Learning and Analytics (72)
- ACI - Affective and Cognitive Institute (57)
Open Access
- Closed Access (1241)
- Open Access (866)
- Closed (533)
- Bronze (190)
- Diamond (53)
- Gold (11)
- Hybrid (11)
- Grün (7)
CONTEXT
The paper addresses the needs of medium and small businesses regarding qualification of R&D specialists in the interdisciplinary cross-industry innovation, which promises a considerable reduction of investments and R&D expenditures. The cross-industry innovation is commonly understood as identification of analogies and transfer of technologies, processes, technical solutions, working principles or business models between industrial sectors. However, engineering graduates and specialists frequently lack the advanced skills and knowledge required to run interdisciplinary innovation across the industry boundaries.
PURPOSE
The study compares the efficiency of the cross-industry innovation methods in one semester project-oriented course. It identifies the individual challenges and preferred working techniques of the students with different prior knowledge, sets of experiences, and cultural contexts, which require attention by engineering educators.
APPROACH
Two parallel one-semester courses were offered to the mechanical and process engineering students enrolled in bachelor’s and master’s degree programs at the faculty of mechanical and process engineering. The students from different years of study were working in 12 teams of 3…6 persons each on different innovation projects, spending two hours a week in the classroom and additionally on average two hours weekly on their project research. Students' feedback and self-assessments concerning gained skills, efficiency of learned tools and intermediate findings were documented, analysed, and discussed regularly along the course.
RESULTS
Analysis of numerous student projects allows to compare and to select the tools most appropriate for finding cross-industry solutions, such as thinking in analogies, web monitoring, function-oriented search, databases of technological effects and processes, special creativity techniques and others. The utilization of learned skills in practical innovation work strengthens the motivation of students and enhances their entrepreneurial competences. Suggested learning course and given recommendations help facilitate sustainable education of ambitious specialists.
CONCLUSIONS
The structured cross-industry innovation can be successfully run as a systematic process and learned in one semester course. The choice of the preferred working teqniques made by the students is affected by their prior knowledge in science, practical experience, and cultural contexts. Major outcomes of the students’ innovation projects such as feasibility, novelty and customer value of the concepts are primarily influenced by students’ engineering design skills, prior knowledge of the technologies, and industrial or business experience.
The production of potable water in dry areas nowadays is mainly done by the desalination of seawater. State of the art desalination plants usually are built with high production capacities and consume a lot of electrical energy or energy from primary resources such as oil. This causes difficulties in rural areas, where no infrastructure is available neither for the plants’ energy supply nor the distribution of the produced potable water. To address this need, small, self-sustaining and locally operated desalination plants came into the focus of research. In this work, a novel flash evaporator design is proposed which can be driven either by solar power or by low temperature waste heat. It offers low operation costs as well as easy maintenance. The results of an experimental setup operated with water at a feed flow rate of up to 1,600 l/h are presented. It is shown that the proof of concept regarding efficient evaporation as well as efficient gas-liquid separation is provided successfully. The experimental evaporation yield counts for 98 % of the vapor content that is expected from the vapor pressure curve of water. Neither measurements of the electrical conductivity of the gained condensate, nor the analysis of the vapor flow by optical methods show significant droplet entrainment, so there are no concerns regarding the purity of the produced condensate for the use as drinking water.
Our media-artistic performances and installations, INTERCORPOREAL SPLITS (2010–2013), BUZZ (2014–2015), W ASTELAND (2015–2016), as well as our new collaboration with Bruno Latour , DE\GLOBALIZE (2018–2020), are not just about polyphony. Here, however, we rediscover them under this heading, thus giving them a new twist, while mapping out issues, mechanisms and functional modes of the polyphonic.
Mit Gendering Marteloskope stellen wir Entwicklungsprozess dar: Entstanden ist videografisches Material in Marteloskopen, die im Wald Bäume, Tablets und Menschen in Dialog zueinander setzen. Die Videografie und die Erfahrungen vor Ort werden mit Ansätzen aus Gender in Science and Technlogy Studies reflektiert sowie mit digital unterstützter kollaborativer Didaktik über interaktive Webdokumentationen zu Open Science Modulen zusammengeführt.
A method for determining properties of a pipeline includes feeding a sound wave signal at a predetermined feed point into the pipeline so that the sound wave signal propagates in an axial direction of the pipeline. The frequency spectrum of the transmitted sound wave signal has a frequency component or a spectral range with a maximum frequency that is smaller than the lower limit frequency for the first upper mode. Reflected portions of the transmitted sound wave signal are detected as received sound wave signal and are evaluated with regard to the transmitted sound wave signal to determine at least the distance of each reflection site from the feed point.
Die Erfindung betrifft ein Verfahren zur Kalibration einer Kamera (110) unter Nutzung eines Bildschirmes (120), wobei der Bildschirm (120) eine Menge von Bildpunkten (122) aufweist und die Kamera (110) eine Vielzahl von Pixeln (112) zur Darstellung des Bildes nutzt. Das Verfahren umfasst die folgenden Schritten (a) Darstellen zumindest eines Bildwertes (BW) in zumindest einem Bildpunkt (122) des Bildschirms (120) basierend auf einer Bildwertzuweisung; (b) Erfassen des zumindest einen Bildwertes (BW) durch einen Pixel (112a) der Kamera (110); und (c) Bestimmen der Position des zumindest einen Bildpunktes (122) auf dem Bildschirm (120) basierend auf dem zumindest einen erfassten Bildwert (BW) und der Bildwertzuweisung.
Die vorliegende Erfindung betrifft ein Verfahren zum digitalen Drucken einer Keramikfarbe auf einem Substrat, wobei die Keramik der Keramikfarbe auf mindestens den Schmelzpunkt der Keramik mittels eines Laserstrahls simultan zu dem Aufbringen der Keramikfarbe auf ein Substrat mittels eines Druckkopfes erwärmt wird. Weiterhin betrifft die vorliegende Erfindung auch die Verwendung eines Laserstrahls in einer Vorrichtung zum digitalen Drucken einer Keramikfarbe auf einem Substrat, wobei der Laserstrahl die Keramik der Keramikfarbe auf mindestens den Schmelzpunkt der Keramik simultan zu dem Aufbringen der Keramikfarbe auf ein Substrat mittels eines Druckkopfes der Vorrichtung erwärmt. Die vorliegende Erfindung betrifft weiterhin auch eine Vorrichtung zum digitalen Drucken einer Keramikfarbe auf einem Substrat, die einen Druckkopf zum Aufbringen einer Keramikfarbe auf ein Substrat sowie einen Laser zum Erwärmen der Keramik der Keramikfarbe auf mindestens den Schmelzpunkt der Keramik mittels eines Laserstrahls umfasst.
Die vorliegende Erfindung betrifft ein Verfahren zum digitalen Drucken einer Keramikfarbe auf einem Substrat, wobei die Keramik der Keramikfarbe auf mindestens den Schmelzpunkt der Keramik mittels eines Laserstrahls simultan zu dem Aufbringen der Keramikfarbe auf ein Substrat mittels eines Druckkopfes erwärmt wird. Weiterhin betrifft die vorliegende Erfindung auch die Verwendung eines Laserstrahls in einer Vorrichtung zum digitalen Drucken einer Keramikfarbe auf einem Substrat, wobei der Laserstrahl die Keramik der Keramikfarbe auf mindestens den Schmelzpunkt der Keramik simultan zu dem Aufbringen der Keramikfarbe auf ein Substrat mittels eines Druckkopfes der Vorrichtung erwärmt. Die vorliegende Erfindung betrifft weiterhin auch eine Vorrichtung zum digitalen Drucken einer Keramikfarbe auf einem Substrat, die einen Druckkopf zum Aufbringen einer Keramikfarbe auf ein Substrat sowie einen Laser zum Erwärmen der Keramik der Keramikfarbe auf mindestens den Schmelzpunkt der Keramik mittels eines Laserstrahls umfasst.
Online comment on: "Printing ferromagnetic domains for untethered fast-transforming soft materials"
(2018)
Numerous 2,5-dimethoxy-N-benzylphenethylamines (NBOMe), carrying a variety of lipophilic substituents at the 4-position, are potent agonists at 5-hydroxytryptamine (5HT2A ) receptors and show hallucinogenic effects. The present study investigated the metabolism of 25D-NBOMe, 25E-NBOMe, and 25N-NBOMe using the microsomal model of pooled human liver microsomes (pHLM) and the microbial model of the fungi Cunninghamella elegans (C. elegans). Identification of metabolites was performed using liquid chromatography-high resolution-tandem mass spectrometry (LC-HR-MS/MS) with a quadrupole time-of-flight (QqToF) instrument. In total, 36 25D-NBOMe phase I metabolites, 26 25E-NBOMe phase I metabolites and 24 25N-NBOMe phase I metabolites were detected and identified in pHLM. Furthermore, 14 metabolites of 25D-NBOMe, 11 25E-NBOMe metabolites, and nine 25N-NBOMe metabolites could be found in C. elegans. The main biotransformation steps observed were oxidative deamination, oxidative N-dealkylation also in combination with hydroxylation, oxidative O-demethylation possibly combined with hydroxylation, oxidation of secondary alcohols, mono- and dihydroxylation, oxidation of primary alcohols, and carboxylation of primary alcohols. Additionally, oxidative di-O-demethylation for 25E-NBOMe and reduction of the aromatic nitro group and N-acetylation of the primary aromatic amine for 25N-NBOMe took place. The resulting 25N-NBOMe metabolites were unique for NBOMe compounds. For all NBOMes investigated, the corresponding 2,5-dimethoxyphenethylamine (2C-X) metabolite was detected. This study reports for the first time 25X-NBOMe N-oxide metabolites and hydroxylamine metabolites, which were identified for 25D-NBOMe and 25N-NBOMe and all three investigated NBOMes, respectively. C. elegans was capable of generating all main biotransformation steps observed in pHLM and might therefore be an interesting model for further studies of new psychoactive substances (NPS) metabolism.
Lithium-ion pouch cells with lithium titanate (Li4Ti5O12, LTO) anode and lithium nickel cobalt aluminum oxide (LiNi0.8Co0.15Al0.05O2, NCA) cathode were investigated experimentally with respect to their electrical (0.1C…4C), thermal (5 °C…50 °C) and long-time cycling behavior. The 16 Ah cell exhibits an asymmetric charge/discharge behavior which leads to a strong capacity-rate effect, as well as a significantly temperature-dependent capacity (0.37 Ah ∙ K−1) which expresses as additional high-temperature feature in the differential voltage plot. The cell was cycled for 10,000 cycles inbetween the nominal voltage limits (1.7–2.7 V) with a symmetric 4C constant-current charge/discharge protocol, corresponding to approx. 3400 equivalent full cycles. A small (0.192 mΩ/1000 cycles) but continuous increase of internal resistance was observed. Using electrochemical impedance spectroscopy (EIS), this could be identified to be caused by the NCA cathode, while the LTO anode showed only minor changes during cycling. The temperature-corrected capacity during 4C cycling exhibited a decrease of 1.28%/1000 cycles. The 1C discharge capacity faded by only 4.0% for CC discharge and 2.3% for CCCV discharge after 10,000 cycles. The cell thus exhibits very good internal-resistance stability and excellent capacity retention even under harsh (4C continuous) cycling, demonstrating the excellent stability of LTO as anode material.
One of the bottlenecks hindering the usage of polymer electrolyte membrane fuel cell technology in automotive applications is the highly load-sensitive degradation of the cell components. The cell failure cases reported in the literature show localized cell component degradation, mainly caused by flow-field dependent non-uniform distribution of reactants. The existing methodologies for diagnostics of localized cell failure are either invasive or require sophisticated and expensive apparatus. In this study, with the help of a multiscale simulation framework, a single polymer electrolyte membrane fuel cell (PEMFC) model is exposed to a standardized drive cycle provided by a system model of a fuel cell car. A 2D multiphysics model of the PEMFC is used to investigate catalyst degradation due to spatio-temporal variations in the fuel cell state variables under the highly transient load cycles. A three-step (extraction, oxidation, and dissolution) model of platinum loss in the cathode catalyst layer is used to investigate the cell performance degradation due to the consequent reduction in the electro-chemical active surface area (ECSA). By using a time-upscaling methodology, we present a comparative prediction of cell end-of-life (EOL) under different driving behavior of New European Driving Cycle (NEDC) and Worldwide Harmonized Light Vehicles Test Cycle (WLTC).
On the Fundamental and Practical Aspects of Modeling Complex Electrochemical Kinetics and Transport
(2018)
Numerous technologies, such as batteries and fuel cells, depend on electrochemical kinetics. In some cases, the responsible electrochemistry and charged-species transport is complex. However, to date, there are essentially no general-purpose modeling capabilities that facilitate the incorporation of thermodynamic, kinetic, and transport complexities into the simulation of electrochemical processes. A vast majority of the modeling literature uses only a few (often only one) global charge-transfer reactions, with the rates expressed using Butler–Volmer approximations. The objective of the present paper is to identify common aspects of electrochemistry, seeking a foundational basis for designing and implementing software with general applicability across a wide range of materials sets and applications. The development of new technologies should be accelerated and improved by enabling the incorporation of electrochemical complexity (e.g., multi-step, elementary charge-transfer reactions and as well as supporting ionic and electronic transport) into the analysis and interpretation of scientific results. The spirit of the approach is analogous to the role that Chemkin has played in homogeneous chemistry modeling, especially combustion. The Cantera software, which already has some electrochemistry capabilities, forms the foundation for future capabilities expansion.
Die Heterogenität der Studienanfänger/innen erleben viele Lehrende unmittelbar in den Anfängerveranstaltungen, Heterogenität nicht nur in Bezug auf fachliche Vorbildung, sondern auch bezüglich verfügbaren Lernstrategien, Fertigkeiten, Motivation und
Selbstdisziplin. Schon allein einer 90-minütigen Vorlesung konzentriert zu folgen und die
Ergebnisse strukturiert zu sichern, ist für viele eine sehr große Herausforderung. In diesem Erfahrungsbericht wird das seit dem WS 2015/16
an der Hochschule Offenburg erprobte Potenzial moderner Tablets untersucht, Vorteile
von klassischem handschriftlichen An- und Mitschreiben mit einer Vorstruktur, wie sie
z.B. PPT-Slides ermöglichen, zu vereinen.
Autonome Systeme im Consumerbereich - Was bedeutet die Autonomie technischer Systeme für den Kunden
(2018)
With the need for automatic control based supervisory controllers for complex energy systems, comes the need for reduced order system models representing not only the non-linear behaviour of the components but also certain unknown process dynamics like their internal control logic. At the Institute of Energy Systems Technology in Offenburg we have built a real-life microscale trigeneration plant and present in this paper a rational modelling procedure that satisfies the necessary characteristics for models to be applied in model predictive control for grid-reactive optimal scheduling of this complex energy system. These models are validated against experimental data and the efficacy of the methodology is discussed. Their application in the future for the optimal scheduling problem is also briefly motivated.