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Designing gentle sinusoidal nanotextures enables the realization of high-efficiency perovskite-silicon solar cells <br /> Perovskite-silicon tandem solar cells offer the possibility of overcoming the power conversion efficiency limit of conventional silicon solar cells. Various textured tandem devices have been presented aiming at improved optical performance, but optimizing film growth on surface-textured wafers remains challenging. Here we present perovskite-silicon tandem solar cells with periodic nanotextures that offer various advantages without compromising the material quality of solution-processed perovskite layers. We show a reduction in reflection losses in comparison to planar tandems, with the new devices being less sensitive to deviations from optimum layer thicknesses. The nanotextures also enable a greatly increased fabrication yield from 50% to 95%. Moreover, the open-circuit voltage is improved by 15 mV due to the enhanced optoelectronic properties of the perovskite top cell. Our optically advanced rear reflector with a dielectric buffer layer results in reduced parasitic absorption at near-infrared wavelengths. As a result, we demonstrate a certified power conversion efficiency of 29.80%.
Management-Bildung
(1993)
Management-Audit
(2001)
Making diversity work
(2004)
Implikationen der Studienabschlüsse Bechelor und Master auf die Personalbeschaffung und -auswahl
(2010)
Humankapital
(2005)
Context. On March 4, 2013 the Fermi-EAT and AGILE reported a flare from the direction of the Crab nebula in which the high-energy (HE; E > 100 MeV) flux was six times above its quiescent level. Simultaneous observations in other energy bands give us hints about the emission processes during the flare episode and the physics of pulsar wind nebulae in general.
Aims. We search for variability in the emission of the Crab nebula at very-high energies (VHF,; E > 100 GeV), using contemporaneous data taken with the H.E.S.S. array of Cherenkov telescopes.
Methods. Observational data taken with the H.E.S.S. instrument on five consecutive days during the flare were analysed for the flux and spectral shape of the emission from the Crab nebula. Night-wise light curves are presented with energy thresholds of 1 TeV and 5 TeV.
Results. The observations conducted with H.E.S.S. on March 6 to March 10, 2013 show no significant changes in the flux. They limit the variation in the integral flux above 1 TeV to less than 63% and the integral flux above 5 TeV to less than 78% at a 95% confidence level.
Geleitwort
(1999)
Etzioni, Amitai
(2000)
Die neue von der r&p management consulting Deutschland herausgegebene "Enquete Human Resource Management" bietet einen aktuellen und umfassenden Überblick über Gehälter sowie strategische und strukturelle Entwicklungen im Personalbereich. Die Folgeausgabe der von r&p 1995 zum ersten Mal veröffentlichten Studie zu diesem Thema gibt mit Übersichts- und Bausteintabellen, mit deren Hilfe sich schnell und individuell umfassend Auskunft zu Gehältern nach Funktionsebenen Vergütungen für die verschiedenen Fachkräfte Vergütungen in Führungspositionen im Human Resource Management. Ausführliche Graphiken und Tabellen sowie umfangreiche Erläuterungen durch Experten geben eine differenzierte Übersicht über Trends im Personal- und Organisationswesen u.a. zu folgenden Themen:Moderne Managementkonzepte und Instrumente des Human Resource Management Generelle Organisation von Personalarbeit Personalfunktionen als Kernkompetenzen des Human Resource Management und ihre weitere Entwicklung Die heutige und die zukünftige Rolle des Human Resource Managers Die zunehmende Bedeutung der Informationstechnologie im Arbeitsalltag des Personalmanagements Einfluss von Betriebsrat und Gewerkschaften auf die Tätigkeiten des Human Resource Managements Die Studie hat einen Umfang von 157 Seiten und wurde in Zusammenarbeit mit der Universität Potsdam erstellt.
Editorial
(2019)
Diversity and Managing Diversity : Verständnisfragen, Zusammenhänge und theoretische Erkenntnisse
(2002)
Der Europäische Betriebsrat
(1995)
Cafeteria-Systeme
(2004)
Cafeteria-Systeme
(2002)
Cafeteria-Systeme
(2001)
Arbeitszeit und Wertewandel
(1993)
Background: Estimating dietary intake is important for both epidemiological and clinical studies, but often lacks accuracy. Objective: To investigate the accuracy and validity of energy intake estimated by an easy-to-use semiquantitative food record (EISQFR) compared to total energy expenditure ( TEE) estimated by doubly labelled water technique (EEDLW). Design: TEE was measured in 29 nonobese subjects using the doubly labelled water method over a period of 14 days. Within this period, subjects reported their food consumption by a newly developed semiquantitative food record for 4 consecutive days. Energy intake was calculated using the German Food Code and Nutrition Data Base BLS II.3. Results: A good correlation was observed between EISQFR and EEDLW (r = 0.685, P<0.001). The mean difference between EISQFR and EEDLW was - 1.7 +/- 2.6 MJ/ day ( - 14 +/- 21%, P = 0.002). An underestimation of EISQFR <10% was observed in nine subjects (31%), of 10 - 20% in six subjects (21%), and of >20% in nine subjects (31%). In five subjects (17%), an overestimation of EISQFR was observed. Conclusions: The easy-to-use semiquantitative food record provided good estimates of EI in free-living and nonobese adults without prior detailed verbal instructions. The presented food record has limitations regarding accuracy at the individual level