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Stainless steel made to rust: a robust water-splitting catalyst with benchmark characteristics
(2015)
The oxygen evolution reaction (OER) is known as the efficiency-limiting step for the electrochemical cleavage of water mainly due to the large overpotentials commonly used materials on the anode side cause. Since Ni–Fe oxides reduce overpotentials occurring in the OER dramatically they are regarded as anode materials of choice for the electrocatalytically driven water-splitting reaction. We herewith show that a straightforward surface modification carried out with AISI 304, a general purpose austenitic stainless steel, very likely, based upon a dissolution mechanism, to result in the formation of an ultra-thin layer consisting of Ni, Fe oxide with a purity >99%. The Ni enriched thin layer firmly attached to the steel substrate is responsible for the unusual highly efficient anodic conversion of water into oxygen as demonstrated by the low overpotential of 212 mV at 12 mA cm−2 current density in 1 M KOH, 269.2 mV at 10 mA cm−2 current density in 0.1 M KOH respectively. The Ni, Fe-oxide layer formed on the steel creates a stable outer sphere, and the surface oxidized steel samples proved to be inert against longer operating times (>150 ks) in alkaline medium. In addition Faradaic efficiency measurements performed through chronopotentiometry revealed a charge to oxygen conversion close to 100%, thus underpinning the conclusion that no “inner oxidation” based on further oxidation of the metal matrix below the oxide layer occurs. These key figures achieved with an almost unrivalled-inexpensive and unrivalled-accessible material, are among the best ever presented activity characteristics for the anodic water-splitting reaction at pH 13.
Background
The population-based mammography screening program (MSP) was implemented by the end of 2005 in Germany, and all women between 50 and 69 years are actively invited to a free biennial screening examination. However, despite the expected benefits, the overall participation rates range only between 50 and 55 %. There is also increasing evidence that belonging to a vulnerable population, such as ethnic minorities or low income groups, is associated with a decreased likelihood of participating in screening programs. This study aimed to analyze in more detail the intra-urban variation of MSP uptake at the neighborhood level (i.e. statistical districts) for the city of Dortmund in northwest Germany and to identify demographic and socioeconomic risk factors that contribute to non-response to screening invitations.
Methods
The numbers of participants by statistical district were aggregated over the three periods 2007/2008, 2009/2010, and 2011/2012. Participation rates were calculated as numbers of participants per female resident population averaged over each 2-year period. Bayesian hierarchical spatial models extended with a temporal and spatio-temporal interaction effect were used to analyze the participation rates applying integrated nested Laplace approximations (INLA). The model included explanatory covariates taken from the atlas of social structure of Dortmund.
Results
Generally, participation rates rose for all districts over the time periods. However, participation was persistently lowest in the inner city of Dortmund. Multivariable regression analysis showed that migrant status and long-term unemployment were associated with significant increases of non-attendance in the MSP.
Conclusion
Low income groups and immigrant populations are clustered in the inner city of Dortmund and the observed spatial pattern of persistently low participation in the city center is likely linked to the underlying socioeconomic gradient. This corresponds with the findings of the ecological regression analysis manifesting socioeconomically deprived neighborhoods as risk factors for low attendance in the MSP. Spatio-temporal surveillance of participation in cancer screening programs may be used to identify spatial inequalities in screening uptake and plan spatially focused interventions.
KiTa-Leiterinnen stehen vor vielen Herausforderungen im Alltag - meistens
ohne, dass sie dafür ausdrücklich qualifiziert worden sind. Im vorliegenden
Beitrag wird das Thema Führungspersönlichkeit diskutiert. Zum einen wird
beleuchtet, wie wichtig die Reflektion der eigenen Vorstellungen von Führung
ist und dass die Persönlichkeit der Kitaleiterin Ausgangspunkt der Teamentwicklung ist. Anhand von praktischen Beispielen aus dem Kita-Alltag werden
Anregungen gegeben, wie z.B. auch mit schwierigen Teammitgliedern konstruktiv Verhaltensänderungen angesprochen werden können: positives Führen,
wertschätzende und stimmige Führung, das Werte- und Entwicklungsquadrat
sowie fünf Dimensionen systemischer Führung bilden den theoretischen Rahmen
The assessment of somatosensory function is a cornerstone of research and clinical practice in neurology. Recent initiatives have developed novel protocols for quantitative sensory testing (QST). Application of these methods led to intriguing findings, such as the presence lower pain-thresholds in healthy children compared to healthy adolescents. In this article, we (re-) introduce the basic concepts of signal detection theory (SDT) as a method to investigate such differences in somatosensory function in detail. SDT describes participants’ responses according to two parameters, sensitivity and response-bias. Sensitivity refers to individuals’ ability to discriminate between painful and non-painful stimulations. Response-bias refers to individuals’ criterion for giving a “painful” response. We describe how multilevel models can be used to estimate these parameters and to overcome central critiques of these methods. To provide an example we apply these methods to data from the mechanical pain sensitivity test of the QST protocol. The results show that adolescents are more sensitive to mechanical pain and contradict the idea that younger children simply use more lenient criteria to report pain. Overall, we hope that the wider use of multilevel modeling to describe somatosensory functioning may advance neurology research and practice.
Background:
Recurrent pain is a common experience in childhood, but only few children with recurrent pain attend a physician. Previous studies yielded conflicting findings with regard to predictors of health care utilization in children with recurrent pain.
Methods:
The present study analyzes data from the German Health Interview and Examination Survey for Children and Adolescents (KiGGS) study comprising n = 2,149 children (3–10 years old) with recurrent pain to find robust predictors.We used multiple logistic regressions to investigate age, gender, socio-economic status(SES), migration background, pain intensity, pain frequency, pain-related disability, mental health problems, and health-related quality of life (HRQL) as predictors for visiting a doctor due to pain.
Results:
Overall, young girls with high pain-related disability, intensity, frequency, and migration background were more likely to attend a physician. Pain-related disability had the largest impact. Socioeconomic status, health-related quality of life anmental health problems were not systematically related to health care utilization. An analysis of the variability of these results indicated that several hundred participants
are needed until the results stabilize.
Conclusions:
Our findings highlight the importance of pain-related disability and frequency in assessing the severity of recurrent pain. Generic predictors and demographic variables are of lesser relevance to children with recurrent pain. On a methodological level, our results show that large-scale studies are need to reliably
identify predictors of health care utilization.
Usability is a core construct of website evaluation and inherently defined as interactive. Yet, when analysing first impressions of websites, expected usability, i.e., before use, is of interest. Here we investigate to what extend ratings of expected usability are related to (a) experienced usability, i.e., ratings after use, and (b) objective usability measures, i.e., task performance. Furthermore, we try to elucidate how ratings of expected usability are correlated to aesthetic judgments. In an experiment, 57 participants submitted expected usability ratings after the presentation of website screenshots in three viewing-time conditions (50, 500, and 10,000 ms) and after an interactive task (experienced usability). Additionally, objective usability measures (task completion and duration) and subjective aesthetics evaluations were recorded for each website. The results at both the group and individual level show that expected usability ratings are not significantly related either to experienced usability or objective usability measures. Instead, they are highly correlated with aesthetics ratings. Taken together, our results highlight the need for interaction in empirical website usability testing, even when exploring very early usability impressions. In our study, user ratings of expected usability were no valid proxy neither for objective usability nor for experienced website usability.
Attitudes Concerning Postmortem Organ Donation : A Multicenter Survey in Various German Cohorts
(2015)
BACKGROUND
The aim of this study was to characterize postmortem organ donation attitudes in various German cohorts.
MATERIAL AND METHODS
Employees of 2 German cities and 2 German university hospitals, employees of a German automobile enterprise, and members of a German Medical Society were administered a questionnaire about postmortem organ and tissue donation attitudes. Demographic data and general attitudes were questioned and focused on: I) willingness to donate organs, II) holding a donor card, and III) having discussed the topic with the family.
RESULTS
Of 5291 participants, 65.2% reported favoring postmortem organ donation. Missing negative experiences, the idea that donation is helpful, a non-medical professional environment, excellent general health, gender, agreement with the brain-death paradigm, and age significantly influenced the participants’ attitudes. Participants were more likely to possess donor cards and had discussed more often with family members if they agreed with the brain-death paradigm and considered donation to be helpful. Males and older participants were the most likely to neglect donor cards, and Catholics, Protestants, and participants with poor health were the least likely to donate organs. Interest in receiving more information was expressed by 38.1% and 50.6% of participants refusing donation of all or of specific organs, respectively, and suggested the internet (60.0%) and family doctors (35.0%) as preferred sources of information.
CONCLUSIONS
Public campaigns in Germany should focus on males and older people as regards donor cards, and females, younger, and religiously affiliated persons as regards the general willingness to donate organs postmortem.
BACKGROUND:
There is little knowledge regarding the association between psychological factors and complex regional pain syndrome (CRPS) in children. Specifically, it is not known which factors precipitate CRPS and which result from the ongoing painful disease.
OBJECTIVES:
To examine symptoms of depression and anxiety as well as the experience of stressful life events in children with CRPS compared with children with chronic primary headaches and functional abdominal pain.METHODS: A retrospective chart study examined children with CRPS (n=37) who received intensive inpatient pain treatment between 2004 and 2010. They were compared with two control groups (chronic primary headaches and functional abdominal pain; each n=37), who also received intensive inpatient pain treatment. Control groups were matched with the CRPS group with regard to admission date, age and sex. Groups were compared on symptoms of depression and anxiety as well as stressful life events.
RESULTS:
Children with CRPS reported lower anxiety and depression scores compared with children with abdominal pain. A higher number of stressful life events before and after the onset of the pain condition was observed for children with CRPS.
CONCLUSIONS:
Children with CRPS are not particularly prone to symptoms of anxiety or depression. Importantly, children with CRPS experienced more stressful life events than children with chronic headaches or abdominal pain. Prospective long-term studies are needed to further explore the potential role of stressful life events in the etiology of CRPS.
Restricted Versus Unrestricted Search Space : Experience from Mining a Large Japanese Database
(2015)
The aim of this study was to investigate whether standard Big Data mining methods lead to clinically useful results. An association analysis was performed using the apriori algorithm to discover associations among co-morbidities of diabetes patients. Selected data were further analyzed by using k-means clustering with age, long-term blood sugar and cholesterol values. The association analysis led to a multitude of trivial rules. Cluster analysis detected clusters of well and badly managed diabetes patients both belonging to different age groups. The study suggests the usage of cluster analysis on a restricted space to come to meaningful results.
Although national eHealth strategies have existed now for more than a decade in many countries, they have been implemented with varying success. In Germany, the eHealth strategy so far has resulted in a roll out of electronic health cards for all citizens in the statutory health insurance, but in no clinically meaningful IT-applications. The aim of this study was to test the technical and organisation feasibility, usability, and utility of an eDischarge application embedded into a laboratory Health Telematics Infrastructure (TI). The tests embraced the exchange of eDischarge summaries based on the multiprofessional HL7 eNursing Summary standard between a municipal hospital and a nursing home. All in all, 36 transmissions of electronic discharge documents took place. They demonstrated the technical-organisation feasibility and resulted in moderate usability ratings. A comparison between eDischarge and paper-based summaries hinted at higher ratings of utility and information completeness for eDischarges. Despite problems with handling the electronic health card, the proof-of-concept for the first clinically meaningful IT-application in the German Health TI could be regarded as successful.
Der Lingener Student Tim Fellendorf sitzt in einem besonderen E-Kart: Mit einer Beschleunigung von 0 auf 60 mph (etwa 100 Kilometer pro Stunde) in 2,635 Sekunden hat die Hochschule Osnabrück gemeinsam mit ihren Projektpartnern einen neuen Weltrekord aufgestellt. Die Fertigung des E-Karts übernahmen Maschinenbaustudierende, angehende Wirtschaftsinformatiker und Wirtschaftsingenieure auf dem Campus Lingen, angeleitet von Prof. Dr. Gerd Terörde.
In Ausgabe 9 des WIR-Journals der Hochschule Osnabrück stellen wir Ihnen zudem die neu fertiggestellte, moderne Bibliothek am Campus Westerberg vor. Außerdem berichtet Doktorandin Maryam Fadami über den komplizierten Einsatz von Multicoptern in Gewächshäusern und wir stellen die studentische Initiative "Campus ohne Grenzen" vor, die Geflüchtete ins Osnabrücker Studentenleben integrieren möchte.
Auf der Titelseite der aktuellen Ausgabe sehen Sie Ebrar Eris, Maschinenbau-Studentin unserer Hochschule. Sie ist Studienpionierin, das heißt die Erste in ihrer Familie, die studiert. Wir freuen uns, wenn Studienpioniere wie Ebrar Eris den Weg zu uns finden.
Was Sie außerdem erwartet: Faszinierende Bilder aus der Werkstatt für Landschaftsarchitektur auf dem Campus Haste unserer Fakultät Agrarwissenschaften und Landschaftsarchitektur, die Idee des Gesundheitscampus Osnabrück und ein Reisebericht aus einem Flugsimulator.
Im Forschungsbericht 2015 lesen Sie unter anderem zu diesen Themen: Inklusion in Schule und Beruf, Anbau von selenreichen Äpfeln und Deutschlands erster barrierefreier Strandkorb für den Tourismus der Zukunft. Außerdem erfahren Sie in dieser Ausgabe, wie eine Doktorandin daran forscht, Keramikimplantate zu verbessern und wieso weniger düngen beim Maisanbau mehr ist.
Bodenschutz im Wald
(2015)
„Bodenschutz im Wald“ – ist das nicht ein exotisches Thema für die heute mit Bodenschutz befassten Personen und Institutionen?
Tatsächlich lässt sich der Standpunkt vertreten, das Bundes-Bodenschutzgesetz (BBodSchG) nehme den Wald aus seinem Zuständigkeitsbereich heraus, weil in §3 des BBodSchG auf die Waldgesetze des Bundes und der Länder als übergeordnete Regelungen verwiesen werde. Aber Wälder machen knapp ein Drittel der Fläche Deutschlands aus. Und: Wer die 1980er Jahre erlebt hat weiß, dass die Sorge um den Bodenzustand der Wälder eine wesentliche Triebkraft der vorsorgenden Umweltpolitik, der Bodenforschung und der Bemühungen um einen systematischen Bodenschutz in Deutschland war.
Nach Umsetzung der Luftreinhaltemaßnahmen ist die Aufmerksamkeit für den Schutz der Waldböden abgeklungen. Aber vor dem Hintergrund von Klimawandel und Energiehunger entstehen neue Herausforderungen für den Umgang mit unseren Wäldern und neue Fragen zur Belastbarkeit unserer Waldböden.
Das diesjährige Forum Boden – Gewässer - Altlasten widmet sich diesen Fragen mit Vorträgen namhafter Experten aus dem In- und Ausland in den Themenfeldern „Belastungen von Waldböden“, „Maßnahmen zum Schutz und zur Wiederherstellung von Waldböden“ sowie „Ökosystemmangement und Waldfunktionen“.
Einleitung: Aktuelle Erkenntnisse der Faszienforschung zeigen, dass Faszien weitaus mehr Einfluss auf den menschlichen Bewegungsapparat haben, als bisher angenommen. Besonders die Fascia Thoracolumbalis (FTL) stellt eine große Faszie dar, deren patholo-gische Veränderungen zu Beschwerden im Bereich des unteren Rückens führen können. Auf der Grundlage dieser Erkenntnisse wurde die Behandlungsmethode mit der Foam Roll entwickelt, um Muskeln und Faszien gezielt zu behandeln und Beschwerden vorzubeugen. Beobachtungen zeigen, dass das Foam Rolling die Dehnfähigkeit der Muskulatur verbes-sert. Jedoch wurde bisher nicht untersucht, wie sich Übungen mit der Foam Roll auf die Beweglichkeit der Faszien auswirken. Ziel dieser Studie ist es daher, aufzuzeigen, ob das Foam Rolling Einfluss auf die Beweglichkeit der FTL hat. Zu diesem Zweck wurden sowohl die kurzfristigen, als auch die langfristigen Auswirkungen untersucht.
Methode: Es nahmen 38 Probanden an der Studie teil. Diese wurden in eine Foam Roll Gruppe, eine Placebo- und eine Kontrollgruppe eingeteilt. Das Bewegungsausmaß einer Rumpfflexion von 30° wurde mit Videos eines Ultraschallgerätes, als Grundlage der Unter-suchungen über die Beweglichkeit der FTL, aufgezeichnet. Anschließend erfolgte die Ana-lyse mit der Cross Correlation Software nach Dr. Andrew Dilley. Hierdurch konnte das Bewegungsausmaß der Faszie ermittelt werden. Neben der Faszienbeweglichkeit wurden Messungen bezüglich der lumbalen, sowie thoracolumbalen Flexion und der Mechanosen-sivität einzelner Muskeln durchgeführt. Zur Ermittlung der Werte gab es eine Messung vorab und zehn Minuten nach der Intervention. Die Messwerte wurden sowohl in einen Vorher-Nachher-Vergleich gestellt, sowie in einem Vergleich zwischen den drei Gruppen. Zusätzlich nahmen zwei Probanden an einer Fallstudie teil, deren Ziel es war die langfristi-gen Wirkungen auf die Beweglichkeit der Faszie zu analysieren.
Ergebnisse: Nach der Behandlung mit der Foam Roll verbesserte sich die Beweglichkeit der FTL durchschnittlich um 1,7915 mm (p<0,001). Dagegen konnte in der Placebogruppe (p=0,397) und in der Kontrollgruppe (p=0,861) keine signifikante Verbesserung der Beweg-lichkeit verzeichnet werden. Messungen mit weiteren Messinstrumenten zeigten keine Verbesserungen. Bei den zwei Probanden der Fallstudie konnte, über einen Zeitraum von vier Wochen, eine Verbesserung der Beweglichkeit der FTL festgestellt werden.
Schlussfolgerung: Durch die Anwendung der Foam Roll konnte die Beweglichkeit der Fascia Thoracolumbalis signifikant verbessert werden.
Schlüsselwörter: Fascia Thoracolumbalis, Ultraschall, Foam Roll, Faszienbeweglichkeit
he development of context-aware applications is a difficult and error-prone task. The dynamics of the environmental context combined with the complexity of the applications poses a vast number of possibilities for mistakes during the creation of new applications. Therefore it is important to test applications before they are deployed in a life system. For this reason, this paper proposes a testing tool, which will allow for automatic generation of various test cases from application description documents. Semantic annotations are used to create specific test data for context-aware applications. A test case reduction methodology based on test case diversity investigations ensures scalability of the proposed automated testing approach.