Suche
Anzeige der Dokumente 131-140 von 257
Aufsatz
Consumer Preferences for Local Food: Testing an Extended Norm Taxonomy
(2018-04-24)
Consumer attitudes toward consuming and buying locally produced food are well studied. By contrast, the topic of consumer preferences for local food, with a special emphasis on the role of norms, still lacks empirical evidence. To study the influence of norms and morals on the intention to buy local food products, a quantitative study (N = 327) focusing on external social and internalized moral norms was conducted using the constructs of the theory of planned behavior in combination with an extended norm taxonomy and ...
Aufsatz
Aqueous Leaching Prior to Dewatering Improves the Quality of Solid Fuels from Grasslands
(2018-04-04)
Renewable energies are necessary to reduce greenhouse gas emissions in energy production, and biomass plays a dominant role in the renewable energy sector. Combustion of biomass constitutes an efficient conversion technique, but is hindered by harmful elements which are frequently contained in residual grassland biomass. We investigated the effect of leaching on solid fuel quality with three independent experiments including the following treatments: (1) with or without leaching, (2) with leaching at various water ...
Dissertation
Simulation-based optimization of solar thermal systems
(2018)
In this PhD thesis application of numerical methods to simulation-based optimization of solar thermal systems both in the planning process and in operation is investigated. The optimization process starting from definition of a target function and specification of optimization parameters, moving forward with application of an optimization algorithm and ending up by sensitivity analysis at the found optimum, is described in detail. A hybrid genetic CHC – binary search algorithm is proposed and applied. As a combination ...
Aufsatz
Short-spored Subulicystidium (Trechisporales, Basidiomycota): high morphological diversity and only partly clear species boundaries
(2018-06-27)
Diversity of corticioid fungi (resupinate Basidiomycota), especially outside the northern temperate climatic zone, remains poorly explored. Furthermore, most of the known species are delimited by morphological concepts only and, not rarely, these concepts are too broad and need to be tested by molecular tools. For many decades, the delimitation of species in the genus Subulicystidium (Hydnodontaceae, Trechisporales) was a challenge for mycologists. The presence of numerous transitional forms as to basidiospore size ...
Dissertation
Estimating the Effects of Climate Change on the Water Resources in the Upper Indus Basin (UIB)
(2018)
Water balance calculations and spatially distributed rainfall-runoff models require high-resolution climatic datasets as the primary input, however, in the Upper Indus basin (UIB), it is rare to find in-situ observational climate data which have spatial, altitudinal and temporal coverage, suitable enough for distributed hydrological investigations and so for the assessment of climate-change’s hydrological impacts. The average precipitation amounts over the UIB are unrealistically low to sustain the observed discharge ...
Aufsatz
Characterization of polyamide 6.10 composites incorporated with microcrystalline cellulose fiber: Effects of fiber loading and impact modifier
(2018-08-14)
Microcrystalline cellulose (MCC) fiber‐reinforced polyamide 6.10 (PA) composites were prepared in the presence of an impact modifier (IM), exxelor VA1803 (VA), by melt compounding process. Fiber loading was considered from 20 to 30 wt.%, whereas IM was varied from 2.0 to 5.0 wt.%. Composites were characterized by tensile test, impact test, dynamic thermal mechanical analysis (DTMA), differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), and X‐ray diffraction (XRD). Composites’ fractured surfaces ...
Dissertation
Entwicklung eines Modells zur Abbildung von Verfahrensketten für nachwachsende Rohstoffe
(2018-12-16)
Neben Nahrungs- und Futtermitteln werden auf landwirtschaftlichen Flächen zunehmend nach-wachsende Rohstoffen erzeugt. Dieser Trend wird durch die deutsche Bundesregierung aktiv gefördert – auch um die gesetzten Klimaziele zu erreichen. Derzeit konzentriert sich das Interesse auf Energiepflanzen und deren Verwertung. Jedoch können nachwachsende Rohstoffe auch in der Industrie eine signifikante Rolle spielen und dort unter anderem konventionelle, endliche Rohstoffe substituieren. Beispielsweise werden bereits heute ...
Aufsatz
Immer noch und immer wieder – Streit um den Status von DRK-Krankenschwestern – Überlegungen nach der Lektüre einer Entscheidungsanmerkung Bernd von Maydells
(2018)
Viele tausend Schwestern des Deutschen Roten Kreuzes arbeiten noch heute in deutschen Krankenhäusern und in der Krankenpflege. Sie tun dies meist auf der Grundlage sogenannter Gestellungsverträge zwischen ihrer jeweiligen Schwesternschaft und dem Krankenhausträger. Der arbeitsrechtliche Status der DRK-Schwestern ist seit Jahrzehnten hochumstritten. Ein Aspekt dieser komplexen Problematik betrifft die Frage, ob solche Schwestern, die aufgrund von Gestellungsverträgen dauerhaft in Krankenhäusern arbeiten, in Bezug auf ...
Teil eines Buches
Ökonomie der Intimität: Racine, Rousseau
(de Gruyter, 2018)
Aufsatz
Distributing mathematical practice of third and seventh graders: Applicability of the spacing effect in the classroom
(2018-10-23)
We examined the effect of distributed practice on the mathematical performance of third and seventh graders (N = 213) in school. Students first received an introduction to a mathematical topic, derived from their curriculum. Thereafter, they practiced in one of two conditions. In the massed condition, they worked on three practice sets in 1 day. In the distributed condition, they worked on one practice set per day for 3 consecutive days. Bayesian analyses of the performance in two follow‐up tests 1 and 6 weeks after ...