University of Hamburg

About: University of Hamburg is a education organization based out in Hamburg, Germany. It is known for research contribution in the topics: Population & Laser. The organization has 45564 authors who have published 89286 publications receiving 2850161 citations. The organization is also known as: Hamburg University.

Study of high-p(T) charged particle suppression in PbPb compared to pp collisions at root s(NN)=2.76 TeV

Abstract: The transverse momentum spectra of charged particles have been measured in pp and PbPb collisions at sqrt(sNN) = 2.76 TeV by the CMS experiment at the LHC. In the transverse momentum range pt = 5-10 GeV/c, the charged particle yield in the most central PbPb collisions is suppressed by up to a factor of 5 compared to the pp yield scaled by the number of incoherent nucleon-nucleon collisions. At higher pt, this suppression is significantly reduced, approaching roughly a factor of 2 for particles with pt in the range pt=40-100 GeV/c.

Beitrag zur Rationalisierung eines dendrochronologischen Verfahrens und zur Analyse seiner Aussagesicherheit

Abstract: Das in Mitteleuropa eingesetzte jahrringchronologische Datierungsverfahren wurde im Hinblick auf Rationalisierung und Aussagesicherheit gepruft. Als zeitliche Engpasse erwiesen sich die Probenentnahme, die Jahrringbreitenmessung, das Zeichnen der Zuwachskurven und vor allem der manuelle Kurvenvergleich. Durch Einsatz einer elektronischen Rechenanlage und anderer Hilfsmittel konnte der Ablauf beschleunigt werden. Fur eine sichere Synchronisierung von Jahrringfolgen wurde der dafur gewahlte Gleichlaufigkeitswert, untersucht. Obwohl sich der Streubereich dieses Wertes bei synchroner und unsynchroner Deckungslage weitgehend uberschneidet, gestattet der Gleichlaufigkeitswert dennoch eine objektive Differenzierung, an Hand derer visuell eine sichere Altersbestimmung moglich ist. Ein Gleichlaufigkeitswert resultiert aus den klimatisch gepragten, gleichsinnig verlaufenden Zuwachsschwankungen (Weiserjahre) und aus den zufallig sich deckenden Kurvenabschnitten. Die Werte beider Komponenten streuen. Erst wenn sich Werte au den beiden positiven Streufeldern summieren, liegt der daraus resultierende Gleichlaufigkeitswert auserhalb der Zufallsstreuung. Zur Demonstration des modifizierten dendrochronologischen Verfahrens wurden einige Datierungsbeispiele angefuhrt.

Efficacy of self-guided internet-based cognitive behavioral therapy in the treatment of depressive symptoms a meta-analysis of individual participant data

Abstract: IMPORTANCE Self-guided internet-based cognitive behavioral therapy (iCBT) has the potential to increase access and availability of evidence-based therapy and reduce the cost of depression treatment. OBJECTIVES To estimate the effect of self-guided iCBT in treating adults with depressive symptoms compared with controls and evaluate the moderating effects of treatment outcome and response. DATA SOURCES A total of 13 384 abstracts were retrieved through a systematic literature search in PubMed, Embase, PsycINFO, and Cochrane Library from database inception to January 1, 2016. STUDY SELECTION Randomized clinical trials in which self-guided iCBT was compared with a control (usual care, waiting list, or attention control) in individuals with symptoms of depression. DATA EXTRACTION AND SYNTHESIS Primary authors provided individual participant data from 3876 participants from 13 of 16 eligible studies. Missing data were handled using multiple imputations. Mixed-effects models with participants nested within studies were used to examine treatment outcomes and moderators. MAIN OUTCOMES AND MEASURES Outcomes included the Beck Depression Inventory, Center for Epidemiological Studies-Depression Scale, and 9-item Patient Health Questionnaire scores. Scales were standardized across the pool of the included studies. RESULTS Of the 3876 study participants, the mean (SD) age was 42.0 (11.7) years, 2531 (66.0%) of 3832 were female, 1368 (53.1%) of 2574 completed secondary education, and 2262 (71.9%) of 3146 were employed. Self-guided iCBT was significantly more effective than controls on depressive symptoms severity (s =-0.21; Hedges g = 0.27) and treatment response (s = 0.53; odds ratio, 1.95; 95% CI, 1.52-2.50; number needed to treat, 8). Adherence to treatment was associated with lower depressive symptoms (s =-0.19; P =.001) and greater response to treatment (s = 0.90; P <.001). None of the examined participant and study-level variables moderated treatment outcomes. CONCLUSIONS AND RELEVANCE Self-guided iCBT is effective in treating depressive symptoms. The use of meta-analyses of individual participant data provides substantial evidence for clinical and policy decision making because self-guided iCBT can be considered as an evidence-based first-step approach in treating symptoms of depression. Several limitations of the iCBT should be addressed before it can be disseminated into routine care.

A global survey of international perspectives on modelling in mathematics education

Abstract: In this article we survey the current debate on modelling and, describe different perspectives on this debate. We relate these perspectives with earlier perspectives and show similarities and differences between these different approaches.