TY - JOUR
AU - Kupriyanova, Yuliya
AU - Zaharia, Oana Patricia
AU - Bobrov, Pavel
AU - Karusheva, Yanislava
AU - Burkart, Volker
AU - Szendroedi, Julia
AU - Hwang, Jong-Hee
AU - Roden, Michael
AU - Roden, M.
AU - Al-Hasani, H.
AU - Burkart, V.
AU - Buyken, Anette
AU - Geerling, G.
AU - Hwang, J.H.
AU - Herder, C.
AU - Icks, A.
AU - Jandeleit-Dahm, K.
AU - Kahl, S.
AU - Kotzka, J.
AU - Kuss, O.
AU - Lammert, E.
AU - Trenkamp, S.
AU - Rathmann, W.
AU - Szendroedi, J.
AU - Ziegler, D.
ID - 27795
JF - Journal of Hepatology
SN - 0168-8278
TI - Early changes in hepatic energy metabolism and lipid content in recent-onset type 1 and 2 diabetes mellitus
ER -
TY - JOUR
AB - Abstract
Objective
To provide a systematic overview of world dietary sugar and sugar-sweetened beverage (SSB) intake trends in children and adolescents.
Data Sources
Medline, Embase, and the Cochrane Central Register of Controlled Trials in the Cochrane Library were searched through January 2019 to identify longitudinal follow-up studies with time-trend data and repeated cross-sectional studies.
Data Extraction
Data from studies reporting ≥ 2 measurements (sugars, SSB, or sweets/candy) over ≥ 2 years and included ≥ 20 healthy, normal- or overweight children or adolescents aged 1–19 years.
Data Analysis
Data from 43 articles (n = 4 prospective cohort studies; n = 39 repeated cross-sectional studies) from 15 countries (n = 8 European countries plus Australia, Canada, China, South Korea, Mexico, Russia, and the United States) are presented narratively. According to the risk of bias in nonrandomized studies of interventions tool, 34 studies were judged to have a moderate risk of bias, and 5 to have a serious risk of bias.
Conclusions
Consumption among US children and adolescents increased substantially in the decades preceding 2000, followed by a faster and continued decline. As a whole, other international intake trends did not reveal drastic increases and decreases in SSB and dietary sugars; they tended to change only slightly across 3 decades.
AU - Della Corte, Karen
AU - Fife, Jessica
AU - Gardner, Alexis
AU - Murphy, Britta L
AU - Kleis, Linda
AU - Della Corte, Dennis
AU - Schwingshackl, Lukas
AU - LeCheminant, James D
AU - Buyken, Anette
ID - 27797
JF - Nutrition Reviews
SN - 0029-6643
TI - World trends in sugar-sweetened beverage and dietary sugar intakes in children and adolescents: a systematic review
ER -
TY - JOUR
AB - Dietary fibre is a generic term describing non-absorbed plant carbohydrates and small amounts of associated non-carbohydrate components. The main contributors of fibre to the diet are the cell walls of plant tissues, which are supramolecular polymer networks containing variable proportions of cellulose, hemicelluloses, pectic substances, and non-carbohydrate components, such as lignin. Other contributors of fibre are the intracellular storage oligosaccharides, such as fructans. A distinction needs to be made between intrinsic sources of dietary fibre and purified forms of fibre, given that the three-dimensional matrix of the plant cell wall confers benefits beyond fibre isolates. Movement through the digestive tract modifies the cell wall structure and may affect the interactions with the colonic microbes (e.g., small intestinally non-absorbed carbohydrates are broken down by bacteria to short-chain fatty acids, absorbed by colonocytes). These aspects, combined with the fibre associated components (e.g., micronutrients, polyphenols, phytosterols, and phytoestrogens), may contribute to the health outcomes seen with the consumption of dietary fibre. Therefore, where possible, processing should minimise the degradation of the plant cell wall structures to preserve some of its benefits. Food labelling should include dietary fibre values and distinguish between intrinsic and added fibre. Labelling may also help achieve the recommended intake of 14 g/1000 kcal/day.
AU - Augustin, Livia S. A.
AU - Aas, Anne-Marie
AU - Astrup, Arnie
AU - Atkinson, Fiona S.
AU - Baer-Sinnott, Sara
AU - Barclay, Alan W.
AU - Brand-Miller, Jennie C.
AU - Brighenti, Furio
AU - Bullo, Monica
AU - Buyken, Anette
AU - Ceriello, Antonio
AU - Ellis, Peter R.
AU - Ha, Marie-Ann
AU - Henry, Jeyakumar C.
AU - Kendall, Cyril W. C.
AU - La Vecchia, Carlo
AU - Liu, Simin
AU - Livesey, Geoffrey
AU - Poli, Andrea
AU - Salas-Salvadó, Jordi
AU - Riccardi, Gabriele
AU - Riserus, Ulf
AU - Rizkalla, Salwa W.
AU - Sievenpiper, John L.
AU - Trichopoulou, Antonia
AU - Usic, Kathy
AU - Wolever, Thomas M. S.
AU - Willett, Walter C.
AU - Jenkins, David J. A.
ID - 27799
JF - Nutrients
SN - 2072-6643
TI - Dietary Fibre Consensus from the International Carbohydrate Quality Consortium (ICQC)
ER -
TY - JOUR
AB - A lower 24-h urine pH (24h-pH), i.e., a higher renal excretion of free protons, at a given acid load to the body, denotes a reduction in the kidney’s capacity for net acid excretion (NAE). There is increasing evidence, not only for patients with type 2 diabetes but also for healthy individuals, that higher body fatness or waist circumference (WC) has a negative impact on renal function to excrete acids (NAE). We hypothesized that adiposity-related inflammation molecules might mediate this relation between adiposity and renal acid excretion function. Twelve biomarkers of inflammation were measured in fasting blood samples from 162 adult participants (18–25 yr old) of the Dortmund Nutritional and Anthropometric Longitudinally Designed (DONALD) study who had undergone anthropometric measurements and collected 24-h urine samples. Both Baron and Kenny’s (B&K’s) steps to test mediation and causal mediation analysis were conducted to examine the potential mediatory roles of biomarkers of inflammation in the WC-24-h pH relationship after strictly controlling for laboratory-measured NAE. In B&K’s mediation analysis, leptin, soluble intercellular adhesion molecule 1 (sICAM-1), and adiponectin significantly associated with the outcome 24-h pH and attenuated the WC-pH relation. In agreement herewith, causal mediation analysis estimated the “natural indirect effects” of WC on 24-h pH via leptin ( P = 0.01) and adiponectin ( P = 0.03) to be significant, with a trend for sICAM-1 ( P = 0.09). The calculated proportions mediated by leptin, adiponectin, and sICAM-1 were 64%, 23%, and 12%, respectively. Both mediation analyses identified an inflammatory cytokine (leptin) and an anti-inflammatory cytokine (adiponectin) along with sICAM-1 as being potentially involved in mediating adiposity-related influences on renal acid excretion capacity.
AU - Hua, Yifan
AU - Herder, Christian
AU - Kalhoff, Hermann
AU - Buyken, Anette
AU - Esche, Jonas
AU - Krupp, Danika
AU - Wudy, Stefan A.
AU - Remer, Thomas
ID - 27800
JF - American Journal of Physiology-Renal Physiology
SN - 1931-857X
TI - Inflammatory mediators in the adipo-renal axis: leptin, adiponectin, and soluble ICAM-1
ER -
TY - JOUR
AU - Nyasordzi, Juliana
AU - Penczynski, Katharina
AU - Remer, Thomas
AU - Buyken, Anette
ID - 27801
JF - PLOS ONE
SN - 1932-6203
TI - Early life factors and their relevance to intima-media thickness of the common carotid artery in early adulthood
ER -
TY - JOUR
AU - Schwingshackl, Lukas
AU - Neuenschwander, Manuela
AU - Hoffmann, Georg
AU - Buyken, Anette
AU - Schlesinger, Sabrina
ID - 27803
JF - The American Journal of Clinical Nutrition
SN - 0002-9165
TI - Reply to Khan et al.
ER -
TY - JOUR
AB - AbstractTrend analyses based on dietary records suggest decreases in the intakes of total sugar (TS), added and free sugar since 2005 among children and adolescents in Germany. In terms of age trends, TS intake decreased with increasing age. However, self-reported sugar intake in epidemiological studies is criticised, as it may be prone to bias due to selective underreporting. Furthermore, adolescents are more susceptible to underreporting than children. We thus analysed time and age trends in urinary fructose excretion (FE), sucrose excretion (SE) and the sum of both (FE + SE) as biomarkers for sugar intake among 8·5–16·5-year-old adolescents. Urinary sugar excretion was measured by UPLC-MS/MS in 997 24-h urine samples collected from 239 boys and 253 girls participating in the Dortmund Nutritional and Anthropometric Longitudinally Designed (DONALD) study cohort between 1990 and 2016. Time and age trends of log-transformed FE, SE and FE + SE were analysed using polynomial mixed-effects regression models. Between 1990 and 2016, FE as well as FE + SE decreased (linear time trend: P = 0·0272 and P < 0·0001, respectively). A minor increase in excretion during adolescence was confined to FE (linear age trend: P = 0·0017). The present 24-h excretion measurements support a previously reported dietary record-based decline in sugar intake since 2005. However, the previously seen dietary record-based decrease in TS from childhood to late adolescence was not confirmed by our biomarker analysis, suggesting a constant sugar intake for the period of adolescence.
AU - Perrar, Ines
AU - Gray, Nicola
AU - Kuhnle, Gunter G.
AU - Remer, Thomas
AU - Buyken, Anette
AU - Alexy, Ute
ID - 27806
JF - British Journal of Nutrition
SN - 0007-1145
TI - Sugar intake among German adolescents: trends from 1990 to 2016 based on biomarker excretion in 24-h urine samples
ER -
TY - JOUR
AB - There is no question that elevated postprandial glycemia is a significant driver of common chronic diseases globally [...]
AU - Brand-Miller, Jennie
AU - Buyken, Anette
ID - 27807
JF - Nutrients
SN - 2072-6643
TI - The Relationship between Glycemic Index and Health
ER -
TY - JOUR
AU - Drossel, Kerstin
AU - Kampmeyer, Meike
ID - 27826
JF - Friedrich Jahresheft #schuleDIGITAL
TI - Lehrerkooperation im Zeitalter der Digitalisierung – Potenziale, Herausforderungen und Gelingensbedingungen
VL - 38
ER -
TY - JOUR
AU - Drossel, Kerstin
AU - Heldt, Melanie
ID - 27827
IS - 2
JF - Schulmanagement
TI - Die Rolle der Schulleitung in Kooperationsprozessen im Zeitalter der Digitalisierung
ER -
TY - CHAP
AU - Eickelmann, Birgit
AU - Drossel, Kerstin
ED - van Ackeren, Isabell
ED - Bremer, Helmut
ED - Kessl, Fabian
ED - Koller, Hans Christoph
ED - Pfaff, Nicolle
ED - Rotter, Caroline
ED - Klein, Dominique
ED - Salaschek, Ulrich
ID - 27828
T2 - Bewegungen - Beiträge zum 26. Kongress der Deutschen Gesellschaft für Erziehungswissenschaft
TI - Lehrer*innenbildung und Digitalisierung - Konzepte und Entwicklungsperspektiven
ER -
TY - CHAP
AU - Drossel, Kerstin
AU - Heldt, Melanie
AU - Eickelmann, Birgit
ED - Kaspar, Kai
ED - Becker-Mrotzek, Michael
ED - Hofhues, Sandra
ED - König, Johannes
ED - Schmeinck, Daniela
ID - 27829
T2 - Bildung, Schule und Digitalisierung
TI - Die Implementation digitaler Medien in den Unterricht gemeinsam gestalten: Lehrer*innenbildung durch medienbezogene Kooperation
ER -
TY - BOOK
AU - Eickelmann, Birgit
AU - Drossel, Kerstin
AU - Heldt, Melanie
ID - 27832
TI - Schule auf Distanz. Perspektiven und Empfehlungen für den Schulalltag. Eine repräsentative Befragung von Lehrkräften in Deutschland
ER -
TY - JOUR
AU - Eickelmann, Birgit
AU - Drossel, Kerstin
AU - Heldt, Melanie
ID - 27833
IS - 3
JF - Schulmanagement. Fachzeitschrift für Schul- und Unterrichtsentwicklung
TI - Vorteile digital fortgeschrittener Schulen in der Pandemie-Zeit. Ergebnisse einer repräsentativen Lehrkräftebefragung
VL - 51
ER -
TY - JOUR
AU - Drossel, Kerstin
AU - Heldt, Melanie
ID - 27834
JF - Schulmagazin 5-10
TI - Medienbezogene Lehrerkooperation. Kooperationsformen und thematische Schwerpunkte
ER -
TY - CHAP
AU - Drossel, Kerstin
AU - Eickelmann, Birgit
ED - Keßler, Catharina I.
ED - Nolte, Sonja
ID - 27835
T2 - (Neue) Formen der Differenzierung. Schul- und Klassenprofilierung im Spannungsfeld gesellschaftlicher Teilhabe und sozialer Ungleichheit
TI - Digitalisierung als Schulprofil am Gymnasium - eine längsschnittliche Untersuchung zur Entwicklung der computerbezogenen Kompetenzen
ER -
TY - JOUR
AB - Abstract
Background
The ongoing digitalization poses new challenges for schools concerning students’ digital skills. In this context, the International Computer and Information Literacy Study (IEA-ICILS 2018) has identified substantial social disparities concerning computer and information literacy of grade 8 students. Furthermore, it has been observed that many schools, especially those located in socioeconomically challenged areas, are particularly engaged in supporting students’ digital literacy and innovatively designing learning processes with information and communications technology (ICT). Empirical studies have made it apparent that some schools have high average achievements concerning domains such as reading literacy and mathematics in spite of socioeconomically challenged student bodies. These schools are regarded as being organizationally resilient. This contribution focusses on these organizationally resilient schools with regard to the domain of computer and information literacy. It aims to investigate how these schools can be classified as a typology according to selected school and/or teacher characteristics.
Methods
As a first step, representative samples of IEA-ICILS 2018 are used to identify organizationally resilient schools by using students’ achievement measures (plausible values) and their background information regarding their families’ socio-economic status. In order to develop a typology, latent profile analyses (LPA) are conducted by using input and process indicators on the school level, which have been proven to be relevant for implementation through existing empirical research.
Results
About one twentieth of the schools examined in this contribution can be regarded as organizationally resilient and can be allocated onto a typology of three school types that are characterized by different school-level factors.
Conclusions
The international comparison permits the conclusion that the phenomenon of organizational resilience is also existent with regard to the content domain of computer and information literacy. However, the proportion of resilient schools is subject to considerable variation between countries.
AU - Drossel, Kerstin
AU - Eickelmann, Birgit
AU - Vennemann, Mario
ID - 27837
JF - Large-scale Assessments in Education
SN - 2196-0739
TI - Schools overcoming the digital divide: in depth analyses towards organizational resilience in the computer and information literacy domain
VL - 8
ER -
TY - CHAP
AU - Vennemann, Mario
AU - Drossel, Kerstin
AU - Eickelmann, Birgit
ED - Eickelmann, Birgit
ED - Labusch, Amelie
ED - Drossel, Kerstin
ED - Vennemann, Mario
ID - 27840
T2 - ICILS 2018 #NRW. Vertiefende Analysen und Befunde für Nordrhein-Westfalen im internationalen Vergleich
TI - Sozial- und migrationsbedingte Disparitäten in den computer- und informationsbezogenen Kompetenzen von Schülerinnen und Schülern
ER -
TY - CHAP
AU - Eickelmann, Birgit
AU - Drossel, Kerstin
AU - Gerick, Julia
ED - Eickelmann, Birgit
ED - Labusch, Amelie
ED - Drossel, Kerstin
ED - Vennemann, Mario
ID - 27850
T2 - ICILS 2018 #NRW. Vertiefende Analysen und Befunde für Nordrhein-Westfalen im internationalen Vergleich
TI - Die Perspektive der Schulleitung auf Prioritäten zum Lernen und Lehren mit digitalen Medien
ER -
TY - CHAP
AU - Eickelmann, Birgit
AU - Drossel, Kerstin
AU - Niemann, Jan
ED - Eickelmann, Birgit
ED - Labusch, Amelie
ED - Drossel, Kerstin
ED - Vennemann, Mario
ID - 27851
T2 - ICILS 2018 #NRW. Vertiefende Analysen und Befunde für Nordrhein-Westfalen im internationalen Vergleich
TI - Lehrerfortbildung zum Lernen und Lehren mit digitalen Medien
ER -
TY - JOUR
AU - Heldt, Melanie
AU - Drossel, Kerstin
AU - Eickelmann, Birgit
ID - 27859
IS - 3
JF - Schulmanagement-Handbuch
TI - Lieber gemeinsam als alleine!? Ein Überblick über die Situation unterrichtsbezogener Lehrerkooperationen im Zeitalter der Digitalisierung in Deutschland
VL - 175
ER -
TY - CHAP
AU - Tondeur, Jo
AU - Petko, Dominik
AU - Barma, Sylvie
AU - Christensen, Rhonda
AU - Drossel, Kerstin
AU - Eichhorn, Koos
AU - Knezek, Gerald
AU - Mukama, Evode
AU - Schmidt-Crawford, Denise
AU - Starkey, Louise
AU - Thabano Nleya, Paul
ED - Fisser, Petra
ED - Phillips, Michael
ID - 27860
T2 - Report of EDUsummIT 2019. Learners and learning contexts: new alignments for the digital age
TI - Advancing Conceptual Models of Technology Integration in Education: Implications for Researchers, Practitioners and Policymakers
ER -
TY - CHAP
AU - Drossel, Kerstin
AU - Heldt, Melanie
AU - Eickelmann, Birgit
ED - Kaspar, Kai
ED - Becker-Mrozek, Michael
ED - Hofhues, Sandra
ED - König, Johannes
ED - Schmeinck, Daniela
ID - 27863
T2 - Bildung, Schule und Digitalisierung
TI - Lehrer*innenbildung durch medienbezogene Kooperation
ER -
TY - JOUR
AB - Abstract
Background
Due to the increasing use of information and communication technology, computer-related skills are important for all students in order to participate in the digital age (Fraillon, J., Ainley, J., Schulz, W., Friedman, T. & Duckworth, D. (2019). Preparing for life in a digital world: IEA International Computer and Information Literacy Study 2018 International Report. Amsterdam: International Association for the Evaluation of Educational Achievement (IEA). Retrieved from https://www.iea.nl/sites/default/files/2019-11/ICILS%202019%20Digital%20final%2004112019.pdf). Educational systems play a key role in the mediation of these skills (Eickelmann. Second Handbook of Information Technology in Primary and Secondary Education. Cham: Springer, 2018). However, previous studies have shown differences in students’ computer and information literacy (CIL). Although various approaches have been used to explain these differences, process data, such as response times, have never been taken into consideration. Based on data from the IEA-study ICILS 2013 of the Czech Republic, Denmark and Germany, this secondary analysis examines to what extent response times can be used as an explanatory approach for differences in CIL also within different groups of students according to student background characteristics (gender, socioeconomic background and immigrant background).
Methods
First, two processing profiles using a latent profile analysis (Oberski, D. (2016). Mixture Models: Latent Profile and Latent Class Analysis. In J. Robertson & M. Kaptein (Eds.), Modern Statistical Methods for HCI (pp. 275–287). Switzerland: Springer. 10.1007/978-3-319-26633-6) based on response times are determined—a fast and a slow processing profile. To detect how these profiles are related to students’ CIL, also in conjunction with students’ background characteristics (socioeconomic and immigrant background), descriptive statistics are used.
Results
The results show that in the Czech Republic and Germany, students belonging to the fast processing profile have on average significantly higher CIL than students allocated to the slow processing profile. In Denmark, there are no significant differences. Concerning the student background characteristics in the Czech Republic, there are significant negative time-on-task effects for all groups except for students with an immigrant background and students with a high parental occupational status. There are no significant differences in Denmark. For Germany, a significant negative time-on-task effect can be found among girls. However, the other examined indicators for Germany are ambiguous.
Conclusions
The results show that process data can be used to explain differences in students’ CIL: In the Czech Republic and Germany, there is a correlation between response times and CIL (significant negative time-on-task effect). Further analysis should also consider other aspects of CIL (e.g. reading literacy). What becomes clear, however, is that when interpreting and explaining differences in competence, data should also be included that relates to the completion process during testing.
AU - Heldt, Melanie
AU - Massek, Corinna
AU - Drossel, Kerstin
AU - Eickelmann, Birgit
ID - 27864
JF - Large-scale Assessments in Education
SN - 2196-0739
TI - The relationship between differences in students’ computer and information literacy and response times: an analysis of IEA-ICILS data
VL - 8
ER -
TY - JOUR
AU - Eickelmann, Birgit
AU - Drossel, Kerstin
ID - 27865
IS - 12
JF - SchulVerwaltung Baden-Württemberg
TI - Schulschließungen und Perspektiven für die Pandemie-Zeit
VL - 29
ER -
TY - CHAP
AU - Drossel, Kerstin
AU - Eickelmann, Birgit
ED - Meister, Dorothee M.
ED - Midt, Ilka
ID - 27866
T2 - Mobile Medien im Schulkontext (Reihe Medienbildung und Gesellschaft)
TI - Der Einsatz von Tablets am Gymnasium und der Zusammenhang mit der Entwicklung computerbezogener Kompetenzen von Schüler*innen
ER -
TY - CHAP
AU - Eickelmann, Birgit
AU - Drossel, Kerstin
ED - Tatnall, Arthur
ID - 27867
SN - 9783030105754
T2 - Encyclopedia of Education and Information Technologies
TI - Students’ computer literacy and the use of tablets in upper secondary schools
ER -
TY - BOOK
AU - Eickelmann, Birgit
AU - Drossel, Kerstin
ID - 27869
TI - Digitales Potenzial. Erfolgreiche Förderung digitaler Kompetenzen von Schülerinnen und Schülern an nicht-gymnasialen Schulen der Sekundarstufe I
ER -
TY - DATA
AU - Teidla-Kunitsõn, Gertha
ID - 27873
TI - ICT usage across Europe: A literature review and an overview of existing data
ER -
TY - JOUR
AU - Dalvandi, Sadegh
AU - Doherty, Simon
AU - Dongol, Brijesh
AU - Wehrheim, Heike
ID - 21016
IS - 2
JF - Dagstuhl Artifacts Ser.
TI - Owicki-Gries Reasoning for C11 RAR (Artifact)
VL - 6
ER -
TY - CONF
AU - Dalvandi, Sadegh
AU - Doherty, Simon
AU - Dongol, Brijesh
AU - Wehrheim, Heike
ED - Hirschfeld, Robert
ED - Pape, Tobias
ID - 21017
T2 - 34th European Conference on Object-Oriented Programming, {ECOOP} 2020, November 15-17, 2020, Berlin, Germany (Virtual Conference)
TI - Owicki-Gries Reasoning for C11 RAR
VL - 166
ER -
TY - CONF
AU - Richter, Cedric
AU - Wehrheim, Heike
ID - 21018
T2 - 35th {IEEE/ACM} International Conference on Automated Software Engineering, {ASE} 2020, Melbourne, Australia, September 21-25, 2020
TI - Attend and Represent: A Novel View on Algorithm Selection for Software Verification
ER -
TY - GEN
ED - Ahrendt, Wolfgang
ED - Wehrheim, Heike
ID - 21019
SN - 978-3-030-50994-1
TI - Tests and Proofs - 14th International Conference, TAP@STAF 2020, Bergen, Norway, June 22-23, 2020, Proceedings [postponed]
VL - 12165
ER -
TY - JOUR
AU - Allgaier, M.
AU - Ansari, V.
AU - Donohue, J. M.
AU - Eigner, Christof
AU - Quiring, V.
AU - Ricken, R.
AU - Brecht, Benjamin
AU - Silberhorn, Christine
ID - 21022
JF - Physical Review A
SN - 2469-9926
TI - Pulse shaping using dispersion-engineered difference frequency generation
VL - 101
ER -
TY - JOUR
AU - Ansari, Vahid
AU - Donohue, John M.
AU - Brecht, Benjamin
AU - Silberhorn, Christine
ID - 21024
IS - 19
JF - Optics Express
SN - 1094-4087
TI - Remotely projecting states of photonic temporal modes
VL - 28
ER -
TY - CHAP
AU - Menke, Peter
ED - Kluge, Bettina
ED - Mihatsch, Wiltrud
ED - Schaller, Birte
ID - 21078
T2 - Kommunikationsdynamiken zwischen Mündlichkeit und Schriftlichkeit. Festschrift für Barbara Job zum 60. Geburtstag
TI - »ich wusste doch irgendwas war zu einfach«. Gesprächsanalytische Betrachtungen von Proberunden zum Lernen von Gesellschaftsspielen
ER -
TY - GEN
AU - Manegold, Philipp
ID - 21117
TI - On Batch Proofs of Partial Knowledge
ER -
TY - GEN
AU - Anonymous, Anonymous
ID - 21118
TI - Measuring the Performance of SNARK Libraries
ER -
TY - GEN
AU - Westerwelle, Max
ID - 21119
TI - Trapdoors and Sampling Procedures for Lattice-Based Cryptographic Constructions
ER -
TY - GEN
AU - Anonymous, Anonymous
ID - 21121
TI - Benchmarking the Efficiency of Secure Multiparty Computation for Real World Problems
ER -
TY - JOUR
AU - Pekkarinen, Satu
AU - Hennala, Lea
AU - Tuisku, Outi
AU - Gustafsson, Christine
AU - Johansson-Pajala, Rose-Marie
AU - Thommes, Kirsten
AU - Hoppe, Julia Amelie
AU - Melkas, Helinä
ID - 21126
JF - Gerontechnology
SN - 1569-1101
TI - Care robots in society: Knowledge and orientation needs
ER -
TY - JOUR
AU - Johansson-Pajala, Rose-Marie
AU - Thommes, Kirsten
AU - Hoppe, Julia Amelie
AU - Tuisku, Outi
AU - Hennala, Lea
AU - Pekkarinen, Satu
AU - Melkas, Helinä
AU - Gustafsson, Christine
ID - 21127
JF - Gerontechnology
SN - 1569-1101
TI - The need for care robot orientation in elder care services
ER -
TY - GEN
AB - In modern lightweight designs, it is important to find a compromise between the strength and the weight of the construction detail. Hence, hybrid structures made of aluminum and steel materials are increasingly being used in automotive applications. Due to limitations in the quality of resistance spot welding, self-piercing riveting can be used as an alternative process to join sheets from different material groups. The aim of this project is to develop a computational method to assess the self-piercing riveted components subjected to the cyclic loads. To achieve this goal, two approaches are followed: Evaluation unsing internal forces: A substitute model is developed to describe the stiffness of self-piercing riveted joints subjected to different loading conditions. The parameters of the substitute model are identified and the internal force components acting on the joint are evaluated. The model provides the basis for the subsequent fatigue life estimation of self-piercing riveted components. For joints subjected to low bending moments, the fatigue life of components can be estimated accurately. Due to lack of specimen geometries producing pure bending and the combination of tension-bending forces, it is not possible to estimate the fatigue life of complex components subjected to high bending moments. Based on the results of [Mesc 16], the methodology is further developed to determine the stresses acting on the joint and to characterize the joining point with the use of simulations. The local concept proposed in the FKM guideline nonlinear provides the basis for the analytical assessment of self-piercing riveted components. In this regard, the cyclic behavior of the material and the local stresses are required as input data. The cyclic behavior of the aluminum EN AW-6181A-T6 and steel HX340LAD sheets were already determined in the previous project. Subsequently, in this project the properties of the rivet made of 38B2 steel are identified. The finite element analysis using elastic-plastic material behavior is used to determine the stresses in the joint subjected to the cyclic loads. To verify the model, the results of simulations and experiments are compared concerning the crack initiation zone as well as the determined number of cycles. To determine the stresses that can be used for the analytical assessment, the damage relevant load components need to be identified. In this regard, it is recommended to use the normal stress perpendicular to the crack propagation direction, the stress of crack opening mode I. Using the damage parameter PRAM and considering the support factors according to the FKM guideline nonlinear, a reliable estimation of the crack initiation zone within the joint is possible. Regarding the joint made of aluminum sheet EN AW-6181A, the methodology is able to provide promising results. However, regarding the joints made of aluminum EN AW-6181A and steel HX340LAD sheets, there is still potential to improve the results. The reasons for this are described in chapter 7.2.5 and 7.2.6. An analytical fatigue assessment is relatively easy to achieve with procedure 1. However, contrary to the objective formulated above, expensive fatigue tests are necessary to determine the failure conditions (strength values). This disadvantage can be circumvented by determining the strength information of individual joining points under different load types using procedure 2. The latter, in return, is not suitable for the assessment of complex components with several joining points. Due to the increasing calculation times of the simulation, the application in this case is not economically reasonable. By the described combination of method 1 and 2, the disadvantages of the two individual concepts can be compensated. An analytical fatigue assessment of self-piercing riveted components can be carried out based on the cyclic material behavior. The objective of the project was achieved.
AU - Otroshi, Mortaza
AU - Meschut, Gerson
AU - Masendorf, Lukas
AU - Esderts, Alfons
ID - 21152
SN - 978-3-86776-602-9
TI - Simulationsbasierte Betriebsfestigkeitsanalyse stanzgenieteter Bauteile
ER -
TY - CONF
AB - Overcoming a range of challenges that traditional therapy faces, VRET yields great potential for the treatment of phobias such as acrophobia, the fear of heights. We investigate this potential and present playful user-generated treatment (PUT), a novel game-based approach for VRET. Based on a requirement analysis consisting of a literature review and semi-structured interviews with professional therapists, we designed and implemented the PUT concept as a two-step VR game design. To validate our approach, we conducted two studies. (1) In a study with 31 non-acrophobic subjects, we investigated the effect of content creation on player experience, motivation and height perception, and (2) in an online survey, we collected feedback from professional therapists. Both studies reveal that the PUT approach is well applicable. In particular, the analysis of the user study shows that the design phase leads to increased interest and enjoyment without notably influencing affective measures during the exposure session. Our work can help guiding researchers and practitioners at the intersection of game design and exposure therapy.
AU - Alexandrovsky, Dmitry
AU - Volkmar, Georg
AU - Spliethöver, Maximilian
AU - Finke, Stefan
AU - Herrlich, Marc
AU - Döring, Tanja
AU - Smeddinck, Jan David
AU - Malaka, Rainer
ID - 21174
SN - 9781450380744
T2 - Proceedings of the Annual Symposium on Computer-Human Interaction in Play
TI - Playful User-Generated Treatment: A Novel Game Design Approach for VR Exposure Therapy
ER -
TY - THES
AU - Wolf, Verena
ID - 21205
TI - Service System Innovation: An Ambidexterity Perspective
ER -
TY - THES
AB - Die additive Fertigung mittels Laser Powderbed Fusion Verfahren (L-PBF) von Metallen wird zunehmend genutzt, um Funktionsbauteile endkonturnah zu fertigen. Die in der vor-liegenden Arbeit untersuchte Parameter- und Prozessoptimierung liefert einen Beitrag zur wirtschaftlichen Nutzung des L-PBF und zeigt, dass höhere Aufbauraten bei der ganzheit-lichen Betrachtung des Prozesses realisierbar sind.
Die Parameter- und Prozessoptimierung erfordert eine Untersuchung des Einflusses der Fertigungs- und Nachbearbeitungsparameter auf das erzeugte Volumen sowie auf die Mikrostruktur und die resultierenden Materialeigenschaften. Das Ziel der vorliegenden Arbeit ist die Entwicklung einer optimierten Prozessführung mit abschließender Bewer-tung der Wirtschaftlichkeit. Mit dem entwickelten Gesamtprozess wird eine um den Faktor 1,6 höhere Aufbaurate erzielt. Des Weiteren wird die Methodik zur Erarbeitung des opti-mierten Prozessfensters beschrieben, sodass die Herangehensweise auf weitere Werk-stoffe angewendet werden kann. Die mechanischen Eigenschaften werden für den stati-schen und dynamischen Lastfall untersucht und mit der Mikrostruktur korreliert. Abschlie-ßend wird die Prozessoptimierung zur Fertigung eines Demonstrators eingesetzt und wirtschaftlich validiert. Die Ergebnisse zeigen, dass durch das hier angewendete Vorge-hen eine Prozesszeitreduktion von 22,5% und eine Kostenreduktion von 11% realisiert werden kann.
AU - Ahlers, Dominik
ID - 21209
KW - Additive Manufacturing
KW - SLM
SN - 978-3844074246
TI - Parameter- und Prozessoptimierung für den additiven Fertigungsprozess im Pulverbett am Beispiel der Legierung Ti6Al4V
VL - 19
ER -
TY - CHAP
AU - Jakob, Eva Alexandra
AU - Hansjürgen, Lea
ED - Lutz, Eva
ED - Süß, Stefan
ID - 21216
T2 - Wettbewerbsfähigkeit von Start-ups, Erfolgreiche Düsseldorfer Unternehmen
TI - Volunteer World GmbH – Schildkrötenretten als Business Case
ER -
TY - JOUR
AB - The electrochemical nitrogen reduction reaction (NRR) to ammonia (NH3) is a promising alternative route for an NH3 synthesis at ambient conditions to the conventional high temperature and pressure Haber--Bosch process without the need for hydrogen gas. Single metal ions or atoms are attractive candidates for the catalytic activation of non-reactive nitrogen (N2), and for future targeted improvement of NRR catalysts, it is of utmost importance to get detailed insights into structure-performance relationships and mechanisms of N2 activation in such structures. Here, we report density functional theory studies on the NRR catalyzed by single Au and Fe atoms supported in graphitic C2N materials. Our results show that the metal atoms present in the structure of C2N are the reactive sites, which catalyze the aforesaid reaction by strong adsorption and activation of N2. We further demonstrate that a lower onset electrode potential is required for Fe--C2N than for Au--C2N. Thus, Fe--C2N is theoretically predicted to be a potentially better NRR catalyst at ambient conditions than Au--C2N owing to the larger adsorption energy of N2 molecules. Furthermore, we have experimentally shown that single sites of Au and Fe supported on nitrogen-doped porous carbon are indeed active NRR catalysts. However, in contrast to our theoretical results, the Au-based catalyst performed slightly better with a Faradaic efficiency (FE) of 10.1{\%} than the Fe-based catalyst with an FE of 8.4{\%} at −0.2 V vs. RHE. The DFT calculations suggest that this difference is due to the competitive hydrogen evolution reaction and higher desorption energy of ammonia.
AU - Sahoo, Sudhir K.
AU - Heske, Julian Joachim
AU - Antonietti, Markus
AU - Qin, Qing
AU - Oschatz, Martin
AU - Kühne, Thomas
ID - 21239
IS - 10
JF - ACS Applied Energy Materials
TI - Electrochemical N2 Reduction to Ammonia Using Single Au/Fe Atoms Supported on Nitrogen-Doped Porous Carbon
VL - 3
ER -
TY - JOUR
AB - In this work, a high-throughput screening of binary and ternary pnictide- and halide-based compounds is performed to identify promising p-type transparent conductors. Our investigation profits from the emergence of open-access databases based on ab-initio results. The band gap, stability, hole effective mass, and p-type dopability are employed for the materials screening and the validity of these descriptors is discussed. Among the final candidates, BaSiN2 is the most promising compound.
AU - Wiebeler, Hendrik
AU - Kormath Madam Raghupathy, Ramya
AU - Mirhosseini, S. Hossein
AU - Kühne, Thomas
ID - 21241
IS - 1
JF - Journal of Physics: Materials
TI - Virtual screening of nitrogen-, phosphorous- and halide-containing materials as p-type transparent conductors
VL - 4
ER -
TY - JOUR
AB - Digital data on tangible and intangible cultural assets is an essential part of daily life, communication and experience. It has a lasting influence on the perception of cultural identity as well as on the interactions between research, the cultural economy and society. Throughout the last three decades, many cultural heritage institutions have contributed a wealth of digital representations of cultural assets (2D digital reproductions of paintings, sheet music, 3D digital models of sculptures, monuments, rooms, buildings), audio-visual data (music, film, stage performances), and procedural research data such as encoding and annotation formats. The long-term preservation and FAIR availability of research data from the cultural heritage domain is fundamentally important, not only for future academic success in the humanities but also for the cultural identity of individuals and society as a whole. Up to now, no coordinated effort for professional research data management on a national level exists in Germany. NFDI4Culture aims to fill this gap and create a user-centered, research-driven infrastructure that will cover a broad range of research domains from musicology, art history and architecture to performance, theatre, film, and media studies.
The research landscape addressed by the consortium is characterized by strong institutional differentiation. Research units in the consortium's community of interest comprise university institutes, art colleges, academies, galleries, libraries, archives and museums. This diverse landscape is also characterized by an abundance of research objects, methodologies and a great potential for data-driven research. In a unique effort carried out by the applicant and co-applicants of this proposal and ten academic societies, this community is interconnected for the first time through a federated approach that is ideally suited to the needs of the participating researchers. To promote collaboration within the NFDI, to share knowledge and technology and to provide extensive support for its users have been the guiding principles of the consortium from the beginning and will be at the heart of all workflows and decision-making processes. Thanks to these principles, NFDI4Culture has gathered strong support ranging from individual researchers to high-level cultural heritage organizations such as the UNESCO, the International Council of Museums, the Open Knowledge Foundation and Wikimedia. On this basis, NFDI4Culture will take innovative measures that promote a cultural change towards a more reflective and sustainable handling of research data and at the same time boost qualification and professionalization in data-driven research in the domain of cultural heritage. This will create a long-lasting impact on science, cultural economy and society as a whole.
AU - Altenhöner, Reinhard
AU - Blümel, Ina
AU - Boehm, Franziska
AU - Bove, Jens
AU - Bicher, Katrin
AU - Bracht, Christian
AU - Brand, Ortrun
AU - Dieckmann, Lisa
AU - Effinger, Maria
AU - Hagener, Malte
AU - Hammes, Andrea
AU - Heller, Lambert
AU - Kailus, Angela
AU - Kohle, Hubertus
AU - Ludwig, Jens
AU - Münzmay, Andreas
AU - Pittroff, Sarah
AU - Razum, Matthias
AU - Röwenstrunk, Daniel
AU - Sack, Harald
AU - Simon, Holger
AU - Schmidt, Dörte
AU - Schrade, Torsten
AU - Walzel, Annika-Valeska
AU - Wiermann, Barbara
ID - 21257
JF - Research Ideas and Outcomes
SN - 2367-7163
TI - NFDI4Culture - Consortium for research data on material and immaterial cultural heritage
ER -