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Now showing items 121-130 of 1990
Aufsatz
High Consistency Silicone Rubber Foams
(2024-04-23)
Silicone elastomers are high-performance plastics. In the extrusion process, only high-consistency silicone rubbers were used. In order to reduce the cost and weight, silicone rubbers can be foamed during processing. In this study, high-consistency silicone rubber is processed with different physical and chemical blowing agents. The resulting reaction kinetics, as well as the mechanical and morphological properties, had been investigated and compared with each other. This showed that the chemical blowing agent ...
Aufsatz
Cost and return analysis of organic and conventional farming systems in the Ganga River Basin, India
(2024-02-26)
Conventional farming (CF) has significantly increased the aggregate supply of food grains and ensured food security for the growing population in India. However, it proved environmentally unsustainable due to its higher reliance on chemical inputs. Organic farming (OF) becomes an alternative approach that ensures the sustainability of the agricultural system. But, the transition from CF to OF can be a lengthy process, and farmers may experience income loss during its course. Farmers will switch only when they are ...
Aufsatz
Inklusive Erwachsenenbildung umsetzen: Die Fortbildung des Projekts INAZ zur Qualifizierung und Professionalisierung der Lehrkräfte in der Erwachsenenbildung
(2021)
Im Zentrum dieses Beitrags steht die Fortbildung für inklusive Erwachsenenbildung, die sich an Kursleitende der Alphabetisierung und des Zweiten Bildungswegs richtet. Diese Fortbildung wurde aus der Praxis für die Praxis im BMBF-finanzierten Forschungsprojekt „Inklusive Bildung in der Alphabetisierungspraxis und im System des Zweiten Bildungswegs – Qualifikationen, Kompetenzen und Bedarfe des pädagogischen Personals“ (INAZ) entwickelt. Ziel des Projektes INAZ ist es, die Qualifikationen und Kompetenzen sowie die ...
Aufsatz
Values as leverage points for sustainability transformation: two pathways for transformation research
(2022-08-13)
The burgeoning literature on sustainability transformation agrees that values play a key, albeit unelucidated, role on the transformation research agenda. Recent literature linking values and transformation increasingly points toward the hypothesis that values may act as leverage points for sustainability transformation. However, how transformation research can engage with values as leverage points remains a critical knowledge gap. Here, I argue that transformation research needs to distinguish between two modes of ...
Aufsatz
Effect of nanometric γ´-particles on the stress-induced martensitic transformation in ⟨001⟩-oriented Co49Ni21Ga30 shape memory alloy single crystals
(2019)
The effect of finely dispersed particles on the functional properties and morphology of thermally induced martensite in Co-Ni-Ga shape memory alloys has been already reported in literature, however, still important aspects are not fully understood. The current study focuses on the stress-induced martensitic transformation of solution-annealed, i.e. precipitate-free, and aged 〈001〉-oriented single crystals. In situ optical microscopy and neutron diffraction experiments show a significant influence of γ′-particles on ...
Aufsatz
Modification of self-reinforced composites (SRCs) via film stacking process
(2022-02-25)
This work presents the mechanical behavior of self-reinforced composites (SRCs) manufactured and modified via film stacking. For modification, interleaved films made of polypropylene (PP), a thermoplastic elastomer and a polyolefin engage were combined in different ways to induce the elastic modifier into the matrix material. The content of modifier was also varied in two ways. First, the films were produced out of a single material and second out of a compound. So, the same content of modifier was implemented in two ...
Aufsatz
Wood-Polypropylene Composites: Influence of Processing on the Particle Shape and Size in Correlation with the Mechanical Properties Using Dynamic Image Analysis
(2018-11-16)
The particle size and shape are of momentous significance for the mechanical properties of plastic composites. However, natural fillers, like wood, are not consistent in these attributes. In order to investigate the shared traits between these characteristics, WPCs were produced using polypropylene, hardwood and softwood fillers with different particle sizes and a coupling agent. Afterwards, specimens were processed using an injection molding machine. The filler sizes and shapes were measured using dynamic image ...
Aufsatz
Characterization of wood-based multi-material systems under dynamic impact stress
(2018)
Due to its naturally grown properties, wood has played a rather subordinate role as a material for technical applications up to now. In this paper, multi-material systems based on veneers of beech (Fagus sylvatica) with different reinforcing variants were investigated. In addition to the influence of different adhesive systems (urea formaldehyde and polyurethane), the effect of reinforcing by aramid fiber fabric and stainless steel foil in different climates was examined. At the center of the investigations were ...
Aufsatz
Influences on the mechanical properties of SRCs in a combined compacting and back injecting process
(2022-03-03)
In this research paper, the effects of the combined compacting and back-injection process to produce back-injected self-reinforced composites on the mechanical properties of the self-reinforced composites (SRCs) are investigated. For this purpose, the parameters barrel temperature, time of injection and holding pressure were varied for the back injection. Tensile and bending tests were carried out on the SRCs. The results show that the mechanical properties depend to a large extent on the process parameters. The ...
Aufsatz
Cross-Linked Hydrophobic Starch Granules in Blends with PLA
(2018-04-17)
The majority of native starch is used in the food sector and in the paper industry. Only a small amount is used in polymer engineering. One reason for the reluctance of the plastics processing industry to use starch as a filling material in polymer blends is the unsatisfactory mechanical behavior of starch when combined with thermoplastics. Another reason is the hydrophilicity of starch. In order to make these materials capable of competing, an amelioration of the mechanical properties is compulsory. By means of ...