Thematische Bibliographien / Dew retting

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Auswahl der wissenschaftlichen Literatur zum Thema „Dew retting“

Autor: Grafiati

Veröffentlicht am 18. Mai 2024

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Zeitschriftenartikel zum Thema "Dew retting"

Lee, C. H., A. Khalina, S. H. Lee und Ming Liu. „A Comprehensive Review on Bast Fibre Retting Process for Optimal Performance in Fibre-Reinforced Polymer Composites“. Advances in Materials Science and Engineering 2020 (13.07.2020): 1–27. http://dx.doi.org/10.1155/2020/6074063.

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Natural fibres are a gift from nature that we still underutilise. They can be classified into several groups, and bast natural fibre reinforcement in polymer composites has the most promising performance, among others. However, numerous factors have reported influences on mechanical properties of the fibre-reinforced composite, including natural fibre retting processes. In this review, bast fibre retting process and the effect of enzymatic retting on the fibre and fibre-reinforced polymer composites have been discussed and reviewed for the latest research studies. All retting methods except chemical and mechanical retting processes are involving secretion of enzymes by bacteria or fungi under controlled (enzymatic retting) or random conditions (water and dew retting). Besides, enzymatic retting is claimed to have more environmentally friendly wastewater products, shorter retting period, and controllable fibre biochemical components under mild incubation conditions. This review comprehensively assesses the enzymatic retting process for producing high-quality bast fibre and will become a reference for future development on bast fibre-reinforced polymer composites.

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Różańska, Wanda, Barbara Romanowska und Szymon Rojewski. „The Quantity and Quality of Flax and Hemp Fibers Obtained Using the Osmotic, Water-, and Dew-Retting Processes“. Materials 16, Nr. 23 (29.11.2023): 7436. http://dx.doi.org/10.3390/ma16237436.

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This study presents the quantity and quality of flax (Linum usitatissimum L.) and hemp (Cannabis sativa L.) fibers obtained depending on the fiber extraction method. The extraction methods used in this study were osmotic degumming, dew retting, and water retting. The degummed straw was analyzed for fiber content, while the metrological, chemical, and physical properties were determined for the fibers obtained. It was shown that these properties change based on the method of fiber extraction used. The highest fiber content in the straw was obtained using the osmotic degumming method. These fibers are characterized by a light color, no unpleasant odor, low linear mass, good tenacity, lowest hygroscopicity, and reduced flammability compared to fibers obtained via the dew and water retting of straw.

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Akin, Danny E. „Linen Most Useful: Perspectives on Structure, Chemistry, and Enzymes for Retting Flax“. ISRN Biotechnology 2013 (30.12.2013): 1–23. http://dx.doi.org/10.5402/2013/186534.

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The components of flax (Linum usitatissimum) stems are described and illustrated, with reference to the anatomy and chemical makeup and to applications in processing and products. Bast fiber, which is a major economic product of flax along with linseed and linseed oil, is described with particular reference to its application in textiles, composites, and specialty papers. A short history of retting methods, which is the separation of bast fiber from nonfiber components, is presented with emphasis on water retting, field retting (dew retting), and experimental methods. Past research on enzyme retting, particularly by the use of pectinases as a potential replacement for the current commercial practice of field retting, is reviewed. The importance and mechanism of Ca2+ chelators with pectinases in retting are described. Protocols are provided for retting of both fiber-type and linseed-type flax stems with different types of pectinases. Current and future applications are listed for use of a wide array of enzymes to improve processed fibers and blended yarns. Finally, potential lipid and aromatic coproducts derived from the dust and shive waste streams of fiber processing are indicated.

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EASSON, D. L., und K. COOPER. „A study of the use of the trimesium salt of glyphosate to desiccate and ret flax and linseed (Linum usitatissimum) and of its effects on the yield of straw, seed and fibre“. Journal of Agricultural Science 138, Nr. 1 (Februar 2002): 29–37. http://dx.doi.org/10.1017/s0021859601001629.

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A replicated field plot experiment was carried out in Northern Ireland in 1996 with flax, cv Ariane, and linseed, cv Flanders, each grown at seed rates of 500, 1000 and 1500 seeds/m2, in which a comparison was made between retting of the standing crop, following desiccation by the trimesium salt of glyphosate (Touchdown, Zeneca Ltd.), and water or dew retting of the pulled crop. Application at 4 litres/ha on 9 August, 33 days after the mid-point of flowering (MPF), achieved both desiccation and partial retting of the crop within 14 days. Over 16% clean long fibre was extracted by scutching the stand-retted flax straw, yielding 800 kg/ha fibre, while water retting achieved 20% extraction and 980 kg/ha yield and dew retting 8·5% and 420 kg/ha respectively. The dew retting was uneven, resulting in high losses during fibre extraction, while water retting for 7 days at 25 °C did not achieve complete retting resulting in a high content of woody fragments in the fibre. Fibre yields increased by almost 50% with the high v. low seed rate. Linseed was less well retted than flax and contained higher levels of impurity in the extracted long fibre which, after retting, yielded 120 to 310 kg/ha at extraction rates of 2·9% to 7·5%.In a second experiment in 1998 flax cvs. Viola and Evelyn were treated with the timesium salt of glyphosate at rates of 2, 4 or 6 litres/ha 10, 20, 30 or 40 days after MPF on 5 July. Viola desiccated satisfactorily at all spray dates with 4 and 6 litres/ha glyphosate. The 20-day treatment desiccated more slowly than the 30-day and the 2 litres/ha rate did not achieve complete desiccation, but the trimesium salt of glyphosate achieved better desiccation at this timing than that found in earlier studies with the original form of glyphosate. Evelyn desiccated more slowly and less evenly than Viola particularly at the 20-day and 40-day timings. Spraying at MPF+10 days interrupted early development of the seed and fibre significantly reducing yields. Due to slower desiccation the 20-day timing was no better than the 30-day, which was well retted by harvest 44 days after spraying, and gave the highest yield of clean long fibre. The spraying 40 days after MPF was considered too late in the season to be of practical use. It was concluded that retting of standing flax following desiccation with the trimesium salt of glyphosate was more effective than with the earlier formulation and that retting of the standing crop could achieve equivalent or better retting with similar fibre yields to traditional retting methods. The optimum spray timing was found to be about 30 days after MPF with 4 or 6 litres/ha, the lower rate being adequate for glyphosate responsive varieties such as Viola.

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Md. Tahir, Paridah, Amel B. Ahmed, Syeed O. A. SaifulAzry und Zakiah Ahmed. „Retting process of some bast plant fibers and its effect on fibre quality: A review“. BioResources 6, Nr. 4 (05.09.2011): 5260–81. http://dx.doi.org/10.15376/biores.6.4.5260-5281.

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Retting is the main challenge faced during the processing of bast plants for the production of long fibre. The traditional methods for separating the long bast fibres are by dew and water retting. Both methods require 14 to 28 days to degrade the pectic materials, hemicellulose, and lignin. Even though the fibres produced from water retting can be of high quality, the long duration and polluted water have made this method less attractive. A number of other alternative methods such as mechanical decortication, chemical, heat, and enzymatic treatments have been reported for this purpose with mixed findings. This paper reviews different types of retting processes used for bast plants such as hemp, jute, flax, and kenaf, with an emphasis on kenaf. Amongst the bast fibre crops, kenaf apparently has some advantages such as lower cost of production, higher fibre yields, and greater flexibility as an agricultural resource, over the other bast fibres. The fibres produced from kenaf using chemical retting processes are much cleaner but low in tensile strength. Enzymatic retting has apparent advantages over other retting processes by having significantly shorter retting time and acceptable quality fibres, but it is quite expensive.

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De Prez, Jana, Aart Willem Van Vuure, Jan Ivens, Guido Aerts und Ilse Van de Voorde. „Effect of enzymatic treatment of flax on chemical composition and the extent of fiber separation“. BioResources 14, Nr. 2 (25.02.2019): 3012–30. http://dx.doi.org/10.15376/biores.14.2.3012-3030.

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Enzymatic treatment of flax is gaining more interest as a promising alternative for dew retting, which is known for its dependence on weather and climate. Therefore, the effect of enzymatic treatments of flax on the effectiveness of fiber separation from each other and chemical fiber composition was investigated in this study. Chemical composition was determined by a gravimetric method, while ease of separation (in the composites society, the process to obtain natural fibers from the plant is usually defined as extraction) was determined based on the amount of long fibers obtained as well as total time needed to release this fiber fraction, providing necessary insights in the extent to which fibers are loosened from the stem. Flax treatment with pectate lyase and polygalacturonase resulted in purified fibers with a cellulose content of 78 and 79% w/w and promising yield values of 24 and 17%, respectively. Besides these pectinases, xylanase activity also showed high potential for enzymatic retting. Hence, pectate lyase, polygalacturonase, and xylanase are promising enzymes to successfully replace the dew retting process.

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De Prez, Jana, Aart W. Van Vuure, Jan Ivens, Guido Aerts und Ilse Van de Voorde. „Flax treatment with strategic enzyme combinations: Effect on fiber fineness and mechanical properties of composites“. Journal of Reinforced Plastics and Composites 39, Nr. 5-6 (24.10.2019): 231–45. http://dx.doi.org/10.1177/0731684419884645.

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The application of natural fibers as reinforcement material in composites can make an important contribution toward a more sustainable bio-based economy. To use these natural fibers, they need to be released from the stem. Traditionally, this is realized by dew retting. However, there are some disadvantages to this retting procedure. Due to changing weather conditions, it is quite difficult to guarantee a good and consistent fiber quality. Replacing the traditional retting process by a biocatalytic process may resolve these issues through application of a combination of pectinase and hemicellulase activities. In this context, several strategic pectinase and hemicellulase activities were blended. Flax fiber fineness and mechanical properties of resulting unidirectional fiber–epoxy composites were studied after treatment of flax stems with these strategic enzyme combinations. Characterization of fiber fineness showed a higher percentage of fiber widths smaller than 100 µm after combined treatment with two enzymes (44.7%), and the percentage was even higher after some combinations with three enzymes (51.2%). Assessment of mechanical properties of composites showed no significant differences in tensile or transverse properties for combined enzymatic treatments. Fiber properties were back-calculated from unidirectional flax fiber–epoxy composites and a Young’s modulus of 88 GPa and a tensile strength of 865 MPa were observed. Enzymatic extraction resulted in the achievement of similar results as dew retting concerning mechanical composite performance and fiber fineness.

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Jankauskiene, Z., A. Lugauskas und J. Repeckiene. „New Methods for the Improvement of Flax Dew Retting“. Journal of Natural Fibers 3, Nr. 4 (09.04.2007): 59–68. http://dx.doi.org/10.1300/j395v03n04_05.

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Stawski, Dawid, Ebru Çalişkan, Nazire Yilmaz und Izabella Krucińska. „Thermal and Mechanical Characteristics of Okra (Abelmoschus esculentus) Fibers Obtained via Water- and Dew-Retting“. Applied Sciences 10, Nr. 15 (25.07.2020): 5113. http://dx.doi.org/10.3390/app10155113.

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In this research, fibers were extracted from different parts of the okra plant (Abelmoschus esculentus) via water- and dew-retting methods. The fibers were subjected to physical and thermal analyses. The fibers obtained from the upper part of the okra plant showed higher breaking strength and lower linear density. Fibers obtained via water-retting exhibited higher breaking strength, higher elongation at break rates, and lower linear density values. The paper also presents the results of thermogravimetric analysis of the okra fibers. Tests were carried out in oxygen and inert gas atmospheres. Slight differences were found in the thermal resistance of the tested fibers, which was confirmed by an analysis using the αs-αr methodology. The calculated activation energy showed a widespread range of values.

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Jankauskienė, Zofija, Elvyra Gruzdevienė, Ernestas Maumevičius und Iryna M. Layko. „INVESTIGATION OF HEMP (CANNABIS SATIVA L.) FIBRE QUANTITY AND QUALITY AS INFLUENCED BY GENOTYPE AND SEED RATE“. Environment. Technology. Resources. Proceedings of the International Scientific and Practical Conference 1 (15.06.2017): 125. http://dx.doi.org/10.17770/etr2017vol1.2530.

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The investigation on hemp fibre quantity and quality as influenced by genotype and seed rate was carried out at the Upytė Experimental Station Lithuanian of the Lithuanian Research Centre for Agriculture and Forestry in 2014. Bi-factorial trial was carried out: Factor A – variety (A1 – USO 31; A2 – Bialobrzeskie); Factor B – sowing rate (B1 – 45 kg ha-1; B2 – 70 kg ha-1). Data showed that variety (genotype) had a significant influence on fibre content (after dew-retting as well after water-retting) – it was higher for variety Bialobrzeskie and amounted to 37.2 and 34.5%, respectively. Seed rate (or crop density) did not show significant influence neither on fibre content nor on fibre quality (flexibility, strength) parameters.

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Dissertationen zum Thema "Dew retting"

Bleuze, Laurent. „Rouissage au sol du chanvre industriel (Cannabis sativa L.) : dynamique sous environnement contrôlé et modélisation Tracking the dynamics of hemp dew retting under controlled environmental conditions“. Thesis, Reims, 2019. http://www.theses.fr/2019REIMS022.

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Le rouissage au champ est un processus qui, grâce à une dégradation microbienne sélective des tissus externes des tiges, conduit à la dissociation partielle des fibres cellulosiques extraxylémiennes, facilitant leur extraction mécanique ultérieure. Il est sous le contrôle de facteurs biotiques et abiotiques dont les effets sont encore mal connus. L’objectif du doctorat était de quantifier et modéliser l’influence de ces facteurs sur le rouissage pour le chanvre industriel (Cannabis sativa L.).Le développement d’un système expérimental novateur a permis de conduire le rouissage sur sol en environnement contrôlé (humidité, température et lumière). La dynamique de rouissage a été caractérisée par mesures des paramètres physico-chimiques des paillis (couleur, masse, composition chimique, architecture tissulaire des tiges) et biologiques (activités enzymatiques). La date de récolte du chanvre (au stade floraison ou au stade maturité de la graine), a modifié les caractéristiques chimiques des tiges et leur dynamique de rouissage en réduisant d’environ 14 jours (à 15°C) la durée de rouissage pour les tiges récoltées à la floraison. La dynamique de colonisation microbienne a été mise en évidence à l’échelle des tiges, mais aussi verticalement au sein du paillis. Les résultats ont permis le développement d’un modèle numérique de rouissage simulant la dégradation biologique des tissus externes (BioRETTING) et l’évolution des propriétés du paillis au cours du rouissage (MulchRETTING). Les analyses par colorimétrie et spectroscopie infrarouge (ATR) sont prometteuses pour le développement d’indicateur de suivi du rouissage au champ
Dew retting is a process that, through selective microbial degradation of the outer tissues of the stems, leads to partial dissociation of extraxylemic cellulosic fibres, facilitating their subsequent mechanical extraction. It is under the control of biotic and abiotic factors whose effects are still poorly understood. The objective of the doctoral work was to quantify and model the influence of these factors on retting for industrial hemp (Cannabis sativa L.).The development of an innovative experimental system has made it possible to carry out retting on soil in a controlled environment (humidity, temperature and lightning). The retting dynamics was characterized by measurements of the physicochemical parameters of the mulch (color, mass, chemical composition, stem tissue architecture) and biological parameters (enzymatic activities). The harvesting time of hemp (at the flowering stage or at the seed maturity stage) modified the chemical characteristics of the stems and their retting dynamics by reducing by about 14 days (at 15°C) the retting duration for the stems harvested at flowering. The dynamic of microbial colonization has been highlighted at the stem level, but also vertically within the mulch. The results allowed the development of a numerical retting model simulating the biological degradation of external tissues (BioRETTING) and the evolution of mulch properties during retting (MulchRETTING). Colorimetric and infrared spectroscopy (ATR) analyses are promising for the development of dew retting monitoring indicators

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Reda, Ali. „A multiscale mechanical study of flax stems and fibres for the development of an in-the-field tool capable of predicting optimum retting“. Electronic Thesis or Diss., Université de Lille (2022-....), 2023. http://www.theses.fr/2023ULILN055.

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L'agriculture 4.0 se développe actuellement rapidement en termes de recherche, de développement et d'applications commerciales. L'objectif de l'agriculture 4.0 est d'utiliser la technologie pour améliorer tous les domaines de l'agriculture. L'agriculture 4.0 est tellement vaste que si l'on veut y contribuer, il faut choisir un domaine spécifique. Le domaine choisi pour l'étude de ce doctorat est la production de fibres de lin. Les fibres de lin sont des fibres naturellement solides qui peuvent être extraites des tiges de lin. Les tiges de lin ont évolué pour avoir des fibres robustes d'un diamètre de l'ordre du micromètre qui courent le long de l'extérieur de la tige et sont maintenues en place dans le tissu externe de la tige. Une fois extraites et isolées, les fibres de lin ont de nombreuses applications, allant des textiles aux matériaux composites. Afin de faciliter l'extraction mécanique des fibres de lin de leurs tiges mères, les tiges subissent un processus connu sous le nom de « rouissage ». Le rouissage entraîne la décomposition du tissu externe (appelé lamelle moyenne) entre les fibres. Une forme courante de rouissage est connue sous le nom de « rouissage de rosée ». Dans le rouissage de la rosée, des processus naturels tels que les bactéries et les champignons produisent des enzymes qui décomposent la lamelle centrale et séparent progressivement les grappes de fibres et les fibres des grappes. La durée du rouissage dépend fortement des conditions météorologiques. Un rouissage insuffisant entraîne une extraction difficile des fibres dans l'usine, tandis qu'un rouissage excessif peut compromettre la qualité des fibres. On sait depuis longtemps qu'il existe un point de rouissage optimal - même les anciens le savaient. Certains agriculteurs artisans qualifiés sont capables de juger ce point par une combinaison de manipulation manuelle des tiges, d'observation des dommages causés aux tissus externes par cette manœuvre, et aussi d'observation de la couleur et de l'odeur des tiges au cours de ce test très habile, mais artisanal. Il est clair que l'artisan effectue des tests de laboratoire rudimentaires littéralement « sur le terrain ». Il semblerait donc logique d'essayer de quantifier ces tests et de voir si un outil fiable peut être mis au point pour aider l'artisan. Et c'est exactement ce que d'autres ont tenté de faire. L'introduction de la thèse donne des exemples de tentatives de fabrication d'outils de rouissage optimal dans les années 1980 et suivantes. Inspirés par ces premiers travaux, les travaux de cette thèse tentent une caractérisation mécanique multi-échelle complète des tiges et des fibres de lin pendant un cycle de rouissage (été 2022) et, de manière quelque peu ambitieuse, réalisée en temps réel - à notre connaissance pour la première fois. La caractérisation mécanique comprend des essais mécaniques macroscopiques (flexion, écrasement et torsion de la tige), ainsi que des essais mécaniques microscopiques inédits sur des fibres de lin individuelles à l'aide de nouvelles méthodes inspirées des MEMS. En outre, les propriétés mécaniques nanoscopiques de la paroi cellulaire primaire des fibres de lin en cours de rouissage ont été caractérisées à l'aide de l'AFM par nanoindentation. Au fur et à mesure que le travail expérimental, l'analyse via la modélisation analytique et l'interprétation descendent en échelle, de la macro au nano en passant par le micro, nous en apprenons un peu plus sur la manière dont le rouissage affecte les tiges, leurs propriétés et leurs fibres. En plus de l'apprentissage, un résultat très positif du doctorat est que l'on est capable de suggérer un mécanisme de dommage induit mécaniquement dans les tiges, qui pourrait être la base d'un outil. On peut cependant noter que la nature multiparamétrique incontrôlable du sujet, par exemple le temps, signifie que plusieurs études seraient nécessaires pour confirmer sans aucun doute les observations d'un seul cycle de rouissage
Agriculture 4.0, also known under several aliases such as ‘digital agriculture', ‘smart farming', and ‘e-farming' is currently developing rapidly in terms of research, development, and commercial applications. As with Agriculture 1.0, 2.0, and 3.0, the objective of Agriculture 4.0 is the use of technology to improve all areas of agriculture. In Agriculture 4.0 it is the application of microelectronics and microtechnologies. Unlike before, these technologies bring things such as the internet-of-things, big data, telecommunications, novel sensing, rapid feedback, data analysis, connectivity, artificial intelligence etc. In principle, all these areas should result in a massive modernization of farming in terms of organisation, yield, efficiency, and quality of produce. However, Agriculture 4.0 is so vast that if one is to contribute to it, even in a minor way, one has to choose a specific area to contribute. The area chosen for the study in this PhD was flax fibre production. Flax fibres are naturally strong fibres which can be extracted from flax stems. The flax stems have evolved to have robust micrometre-diameter fibres running the length of the outside of the stem, and held in place in the external tissue of the stem. Once extracted and isolated, flax fibres have numerous applications ranging from textiles to composite materials. In order to facilitate the mechanical extraction of flax fibres from their parent stems, the stems undergo a process known as ‘retting'. Retting leads to the breakdown of the external tissue between the fibres. A common form of retting is known as ‘dew retting'. In dew retting, natural processes such as bacteria and fungi result in enzymes which break down the middle lamella and gradually separate fibre bunches and fibres from bunches. The length of dew retting depends heavily on the weather. Too little retting results in difficult fibre extraction in the factory, too much retting can result in a compromise in fibre quality. It has long been known that there is an optimum retting point-even the ancients knew this. Certain skilled artisan farmers are able to judge this point via a combination of manual manipulation of the stems, observation of damage caused to the external tissue via this manoeuvre, and also observing the colour and the smell of the stems during this very skilled, but artisanal, testing. It is clear that the artisan is performing rudimentary laboratory tests quite literally ‘in-the-field'. It would seem logical therefore to try to quantify such tests and see if a reliable tool can be made to help the artisan. And indeed, this is exactly what others have attempted. The introduction of the PhD gives examples of attempts to make optimal-retting tools in the 1980s and after. Inspired by this early work, the work of this PhD attempts a full multiscale mechanical characterization of flax stems and fibres during a retting cycle (summer 2022) and, somewhat ambitiously, performed in real time-to our knowledge for the first time. The mechanical characterization involved macroscopic mechanical tests (bending, crushing, and twisting), as well as novel microscopic mechanical testing of single flax fibres using novel methods inspired by MEMS. In addition, the nanoscopic mechanical properties of the primary cell wall of retting flax fibres was characterised using nanoindentation AFM. As the experimental work, analysis via analytical modelling, and interpretation descends in scale from macro, through micro, to nano, we learn a little more of how the retting affects the stems, their properties, and their fibres. In addition to simply learning, a very positive outcome of the PhD is that one is able to suggest a mechanically-induced damage mechanism in stems which could be the basis for a tool. One can note however, that the uncontrollable multiparameter nature of the subject, e.g. the weather, means that several studies would be needed to confirm beyond doubt observations from a single retting cycle

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Roediger, Claudia. „Der Roman in Dänemark in den 80ern : die Rettung des Vielen in einen Adorno /“. Hamburg : Dr Kovač, 1999. http://catalogue.bnf.fr/ark:/12148/cb37689167r.

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Maucher, Andreas. „Die Rettung des Fortschritts : Ernst Bloch im "Diskurs der Moderne /“. Konstanz : Hartung-Gorre Verl, 1989. http://catalogue.bnf.fr/ark:/12148/cb366601164.

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Schulte, Barbara. „Zur Rettung des Landes Bildung und Beruf im China der Republikzeit“. Frankfurt, M. New York, NY Campus-Verl, 2007. http://d-nb.info/986751480/04.

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Müller, Anna Karena. „Gottes Zukunft : die Möglichkeit der Rettung am Tag JHWHs nach dem Joelbuch /“. Neukirchen-Vluyn : Neukirchener Verl, 2008. http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&doc_number=016469906&line_number=0002&func_code=DB_RECORDS&service_type=MEDIA.

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Müller, Anna Karena. „Gottes Zukunft die Möglichkeit der Rettung am Tag JHWHs nach dem Joelbuch“. Neukirchen-Vluyn Neukirchener Verl, 2006. http://d-nb.info/98704995X/04.

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Pfeifer, Sascha. „Optimierung der automatischen Notfallmeldung zur Rettung verunglückter Fahrzeuginsassen /“. Düsseldorf : VDI-Verl, 2008. http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&doc_number=016428651&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA.

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Juretzko, Annett [Verfasser], Rainer [Akademischer Betreuer] Rettig, Rainer [Gutachter] Rettig und Wolf Hayo [Gutachter] Castrop. „Bedeutung des intrarenalen Renin-Angiotensin-Systems für die Entwicklung der chronischen Nierenkrankheit / Annett Juretzko ; Gutachter: Rainer Rettig, Wolf Hayo Castrop ; Betreuer: Rainer Rettig“. Greifswald : Universität Greifswald, 2021. http://d-nb.info/1230553258/34.

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Spengler, Barbara. „Brassinosteroide und Sterole aus den europäischen Kulturpflanzen Ornithopus sativus, Raphanus sativus und Secale cereale /“. Halle/Saale, 1995. http://www.gbv.de/dms/bs/toc/194925307.pdf.

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Bücher zum Thema "Dew retting"

Rust, Holger. Rettung der Digitalisierung vor dem Digitalismus. Wiesbaden: Springer Fachmedien Wiesbaden, 2019. http://dx.doi.org/10.1007/978-3-658-26998-2.

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Rehn, Olli. Die Rettung des Euro. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-59963-8.

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Posselt, Alfred. Rettung aus der todeszelle. Wien: Reformjudenten, 1985.

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J, Arató Pál S., Pichorner Franz 1960- und Wewalka Lotte, Hrsg. Untergang oder Rettung der Donaumonarchie? Wien: Böhlau Verlag, 2004.

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Krosigk, Klaus von, Jörg Kuhn, Detlef Pietzsch und Wolfgang Henkel. Der Invalidenfriedhof: Rettung eines Nationaldenkmals. Hamburg: L&H Verlag, 2003.

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Hillenbrand, Klaus. Der Ausgetauschte: Die aussergewöhnliche Rettung des Israel Sumer Korman. Frankfurt am Main: Scherz, 2010.

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Maucher, Andreas. Die Rettung des Fortschritts: Ernst Bloch im "Diskurs der Moderne". Konstanz, Germany: Hartung-Gorre, 1989.

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Born, Karl. Rettung zwischen den Fronten: Seenotdienst der deutschen Luftwaffe, 1939-1945. Hamburg: Mittler, 1996.

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Juraschek, Anna. Die Rettung des Bildes im Wort. Göttingen: Vandenhoeck & Ruprecht, 2018. http://dx.doi.org/10.13109/9783666300851.

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Ruff, Siegfried. Sicherheit und Rettung in der Luftfahrt. Koblenz: Bernard & Graefe, 1989.

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Buchteile zum Thema "Dew retting"

Carrano, Elli. „Das poetische Wort als Rettung vor dem Aussterben“. In Lettre, 121–36. Bielefeld, Germany: transcript Verlag, 2022. http://dx.doi.org/10.14361/9783839462980-008.

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Elli Carrano widmet sich in diesem Beitrag der Frage, ob und wie die Literatur als Weckruf für den Ausnahmezustand dienen kann, in dem sich die Erde befindet. Ausgehend von Carla Benedettis Essay "Die Literatur wird uns vor dem Aussterben retten" (La letteratura ci salverà dall'estinzione, 2021) werden die zwei griechischen Novellen "Μαύρο Νερό" (Schwarzes Wasser, 2019) und Η Θάλασσα (Das Meer, 2020) von Michalis Makropoulos analysiert, die sich in den Rahmen der postapokalyptischen Fiktion und der Ökokritik einordnen lassen. Die Textanalyse stützt sich auf zentrale Theoretiker aus den zeitgenössischen Kultur- und Sozialwissenschaften wie Paul Virilio, Hartmut Rosa, Zygmunt Bauman u.a.

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Piétron, Dominik. „Tech-Lash, what’s next? Drei Strategien zur Demokratisierung der sozialen Medien“. In Welche Öffentlichkeit brauchen wir?, 85–97. Wiesbaden: Springer Fachmedien Wiesbaden, 2023. http://dx.doi.org/10.1007/978-3-658-39629-9_8.

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ZusammenfassungGegenüber der wachsenden Bedeutung von Social-Media-Plattformen und den Großkonzernen, die sie betreiben, hat sich ein allgemeines gesellschaftliches Unbehagen herausgebildet. Sie schaden der Demokratie, fördern Desinformation, verstärken Hetze, manipulieren Nutzer:innen, entziehen der journalistischen Arbeit Werbeeinnahmen und damit finanzielle Ressourcen, lauten einige Vorwürfe. Vor diesem Hintergrund stellt sich die Frage nach den technopolitischen Voraussetzungen einer erfolgreichen Demokratisierung der sozialen Medien. Der Fokus liegt dabei auf der strukturellen Stärkung demokratischer Grundrechte. Drei komplementäre Strategien – staatliche Regulierung der großen Social-Media-Plattformen, Förderung freier und dezentraler Alternativen, gesetzliche Verpflichtung zur Interoperabilität – könnten Privatsphäre, demokratische Repräsentation und Wahlfreiheiten ins digitale Zeitalter retten.

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Kuchar, Robin. „Musikclubs in der Livemusikökologie - Situation und kulturpolitische Implikationen in Zeiten der Pandemie“. In Kultur:Wandel - Impulse für eine zukunftsweisende Kulturpraxis, 111–22. Bielefeld, Germany: transcript Verlag, 2023. http://dx.doi.org/10.14361/9783839464922-012.

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Clubs und Clubkultur kämpfen seit langem um die Anerkennung als Kultur ˗ und mit einer ganzen Reihe weiterer Herausforderungen im städtischen (Gentrifizierung, Musealisierung), und kulturökonomischen (Livemusik-Industrie vs. lokale Livemusik-Ökologien) Bereich. Zudem entwickelt sich der Diskurs um ein kulturelles Erbe alternativer Formen von Popmusik und lokaler Musikszenen zu einem immer wichtiger werdenden Anknüpfungspunkt, wenn es um deren Erhaltung und Bedeutung für die Stadt geht - gerade in Zeiten der Krise, in denen das Überleben weiter Teile der Live- und Clubkultur direkt mit der An- oder Aberkennung von deren kulturellem Wert einhergeht. In diesem Beitrag werden die Auswirkungen von Covid-19 auf die Live- und Clubkultur bezogene Entwicklungen der Covid19-Krise der Diskurs um die ,öffentliche Rettung' von Musikclubs und Livemusikkultur sowie deren kulturpolitische Situation in post-pandemischer Zeit in den Blick genommen.

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Ellebrecht, Nils. „Dimensionen des Notfalls“. In Organisierte Rettung, 11–71. Wiesbaden: Springer Fachmedien Wiesbaden, 2020. http://dx.doi.org/10.1007/978-3-658-30162-0_2.

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Clark, Stuart. „Rettung aus den Klauen der Singularität“. In Das unbekannte Universum, 283–313. Berlin, Heidelberg: Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-54896-7_10.

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Berger, Maxi. „Kunst ins Leben oder Rettung des Scheins?“ In Der Vorrang des Objekts, 103–20. Berlin, Heidelberg: Springer Berlin Heidelberg, 2022. http://dx.doi.org/10.1007/978-3-662-65690-7_7.

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Precht, Claus. „Sozioökonomische und politisch-administrative Voraussetzungen der Elbesanierung“. In Rettung eines Flusses, 11–100. Wiesbaden: VS Verlag für Sozialwissenschaften, 1994. http://dx.doi.org/10.1007/978-3-322-96005-4_1.

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Kanz, K. G., G. Schmöller, K. Enhuber, G. Hölzl, J. A. Sturm und W. Mutschler. „Technische Rettung bei Verkehrsunfall“. In Logbuch der Notfallmedizin, 97–99. Berlin, Heidelberg: Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/978-3-642-55797-2_12.

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Baltz, Petra. „Die Rettung des Suizidenten“. In Lebenserhaltung als Haftungsgrund, 223–53. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-12731-1_7.

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Kanitscheider, Bernulf. „Die Rettung der Phänomene“. In Natur und Zahl, 280–83. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-37708-2_27.

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Konferenzberichte zum Thema "Dew retting"

SINGHAL, ANSHUL, AMY LANGHORST, ANKUSH BANSAL, MIHAELA BANU und ALAN TAUB. „OPTIMIZATION OF RETTING AND EXTRACTION THROUGH CONSTITUTIVE MATERIAL MODELLING OF PLANT STEMS FOR VARIABILITY REDUCTION IN EXTRACTED NATURAL FIBERS“. In Thirty-sixth Technical Conference. Destech Publications, Inc., 2021. http://dx.doi.org/10.12783/asc36/35867.

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Natural plant fibers compared to glass fibers can provide a cost effective, lightweight and carbon negative reinforcement for polymer composites. However, the current commercial fiber extraction process induces defects including middle lamellae weakening during retting and kink bands during mechanical working. This leads to high variability in mechanical properties, making these fibers less favorable for structural applications at industrial scale. The aim of current research is to reduce this variability by studying the underlying mechanisms of natural fiber extraction to minimize fiber damage occurring at various steps in the process. In this study, flax stems were retted using the conventional dew/field and lab scale controlled enzymatic retting. The hand decorticated fibers from both methods were compared and enzymatic retting showed promising results in producing fine and uniform fibers as compared to fibers extracted by dew retting. To establish the constitutive parameters of the fibers for Finite Element Modeling (FEM), single retted flax stems were compression tested using a Texture Analyzer. This data can serve as the basis for modeling the mechanical deformation of plant stems passing through breaking rollers which is the first step in extraction after retting. The goal is to optimize the roller design and process conditions required to extract fibers with minimal damage and variability.

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Rahayu, Farida, Atif Khurshid Wani, Mala Murianingrum, Marjani, Cece Suhara und Budi Hariyono. „Studies on dew retting process of kenaf by formulation of indigenous consortium bacteria“. In INTERNATIONAL CONFERENCE ON BIOENGINEERING AND TECHNOLOGY (IConBET2021). AIP Publishing, 2022. http://dx.doi.org/10.1063/5.0078708.

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SINGHAL, ANSHUL, AMY LANGHORST, MIHAELA BANU und ALAN TAUB. „EFFECT OF ENZYMATIC RETTING CONDITIONS ON THE DIAMETER AND MECHANICAL PROPERTIES OF FLAX FIBERS“. In Proceedings for the American Society for Composites-Thirty Seventh Technical Conference. Destech Publications, Inc., 2022. http://dx.doi.org/10.12783/asc37/36478.

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The current industrial method of extracting natural plant fibers, originally intended for their textile use, can degrade the inherent mechanical properties, making them difficult to replace e-glass fibers for reinforcement in polymer composites. Microorganisms during the initial dew/field retting step of fiber extraction process not only degrades the fiber-stem interphase bond constituting primarily pectin and lignin, but also degrades the structural components of the fiber such as cellulose, resulting in non-uniform technical fibers with poor mechanical properties. Also, current single fiber testing standards used for mechanical properties characterization of these fibers are suitable for assessing homogenous and uniform fiber properties correctly, which is not the case in natural fibers. In this study, the flax stems were treated with Pectinase Ultra SPL enzyme targeted to degrade the pectin bonds between the fibers and plant stem, without affecting the structural component cellulose. In this study, the size of technical fibers hand extracted from dew and enzyme retted flax are compared. The hand extracted enzyme retted stem fibers showed more uniform, finer diameters resulting in better tensile properties when compared with dew/field retted stem fibers. The improved properties are related to the diameter effect in which as the area of these fibers is reduced, the reduction of defects during the fiber extraction.

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Hassepass, F., S. Arndt, A. Aschendorff, I. Speck und T. Schulz. „Fallbericht: Azathioprin – die Rettung des letzthörenden Ohres bei rezidivierenden Hörstürzen?“ In 100 JAHRE DGHNO-KHC: WO KOMMEN WIR HER? WO STEHEN WIR? WO GEHEN WIR HIN? Georg Thieme Verlag KG, 2021. http://dx.doi.org/10.1055/s-0041-1728262.

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Schmitt, Martina, Sabine Eichberg und Elisabeth Ostermann. „Rettungs-BOJE für junge Menschen am Kölner Hauptbahnhof“. In 71. Wissenschaftlicher Kongress des BVöD e.V. und BZö e.V. Georg Thieme Verlag, 2022. http://dx.doi.org/10.1055/s-0042-1745565.

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Rieder, N., C. Banse und F. Nauck. „Kontroversen am Lebensende: Nicht-ärztliches Rettungsdienstpersonal zwischen „Leben retten“ und „sterben zulassen“ [218]“. In 13. Kongress der Deutschen Gesellschaft für Palliativmedizin. © Georg Thieme Verlag KG, 2020. http://dx.doi.org/10.1055/s-0040-1714800.

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