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Experimental and computational analysis of the coolant distribution considering the viscosity of the cutting fluid during machining with helical deep hole drills

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Advances in Manufacturing 2022年第2期10卷 235-249页

作者： Ekrem Oezkaya sebastian michel Dirk Biermann Institute of Machining Technology Dortmund University of Technology(TU Dortmund)Dortmund 44227Germany

An experimental analysis regarding the distribution of the cutting fluid is very difficult due to the inaccessibility of the contact zone within the bore ***,suitable simulation models are necessary to evaluate new tool designs and optimize drilling *** this paper the coolant distribution during helical deep hole drilling is analyzed with high-speed *** particles are added to the cutting fluid circuit bya developed high-pressure mixing *** the evaluation of suitable particle size,particle concentration and coolant pressure,a computational fluid dynamics(CFD)simulation is validated with the experimental *** comparison shows a very good model quality with a marginal difference for the flow velocity of 1.57%between simulation and *** simulation considers the kinematic viscosity of the *** results show that the fluid velocity in the chip flutes is low compared to the fluid velocity at the exit of the coolant channels of the tool and drops even further between *** velocity and the flow pressure directly at the cutting edge decrease to such an extent that the fluid cannot generate a sufficient cooling or *** the CFD simulation a deeper understanding of the behavior and interactions of the cutting fluid is *** on these results further research activities to improve the coolant supply can be carried out with great potential to evaluate new tool geometries and optimize the machining process.

关键词： Computational fluid dynamics(CFD)analysis:Viscosity-Tracermicro particles Fluidbehavior Helical deep hole drilling

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Effect of toasting grain silages from field peas(Pisum sativum)and field beans(Vicia faba)on in vitro gas production,methane production,and post-ruminal crude protein content

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Animal Nutrition 2020年第3期6卷 342-352页

作者： Martin Bachmann Christian Kuhnitzsch sebastian michel Annabel Thierbach Mandy Bochnia Jorg M.Greef Siriwan D.Martens Olaf Steinhofel Annette Zeyner Institute of Agricultural and Nutritional Sciences Martin Luther University Halle-WittenbergHalle(Saale)06120Germany Saxon State Office for Environment Agriculture and GeologyKollitsch04886Germany Julius Kühn Institute Federal Research Centre for Cultivated PlantsInstitute for Crop and Soil ScienceBraunschweig38116Germany

Legume grains such as field peas and field beans can be produced on a local level,and may be reliable sources of dietary protein and energy apart from common soybean and rapeseed *** ruminants,protein,starch,and carbohydrates from peas and field beans are fermented in large part before reaching the small *** objective of this study was to evaluate the effects of a combination of ensiling and hydro-thermic treatment(i.e.,toasting at 160℃for 30 min)of grains of peas and field beans on the concentrations of post-ruminal crude protein(PRCP)and rumen-undegraded protein(RUP).Moreover,24-h gas production and methane production were *** this,an in vitro batch culture system with ruminal fluid from sheep was ***-undegraded protein was determined using the Streptomyces griseus protease *** electron micrographs were used to visualize morphological changes of starch granules and their joint matrices in peas and field beans after ensiling,toasting,or a combination of *** pea grains contained crude protein(CP)at 199 g/kg DM,PRCP at 155 g/kg DM at a ruminal passage rate of 0.08/h(Kp8),RUP at 33 g/kg DM at Kp8,and starch at 530 g/kg *** field beans contained CP at 296 g/kg DM,PRCP at 212 g/kg DM at Kp8,RUP at 54 g of/kg DM at Kp8,and starch at 450 g/kg *** PRCP did not considerably differ among native and treated peas or field *** in the peas,RUP at Kp8 increased after ensiling by 10 g/kg DM(i.e.,30%;P<0.05).Toasting increased RUP(Kp8)in ensiled peas by another 28%(P<0.05).Toasting had no effect on PRCP or RUP when the peas or field beans were not ensiled *** and methane production were not affected by any treatment,and scanning electron micrographs did not reveal structural changes on the starches doubtless of any *** seemed to be more affected by treatment with ensiled+toasted peas than with ensiled+toasted field beans,but starches and other carbohydrates from both legumes remained unaffec

关键词： Legume grain silage Toasting In vitro gas production Protein evaluation Streptomyces griseus protease test

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Charge carrier mobilities of organic semiconductors:ab initio simulations with mode-specific treatment of molecular vibrations

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npj Computational Materials 2022年第1期8卷 2199-2209页

作者： sebastian Hutsch michel Panhans Frank Ortmann School of Natural Sciences Department of ChemistryTechnische Universität MünchenGarching b.MünchenGermany

The modeling of charge transport in organic semiconductors usually relies on the treatment of molecular vibrations by assuming a certain limiting case for all vibration modes,such as the dynamic limit in polaron theory or the quasi-static limit in transient localization *** opposite limits are each suitable for only a subset of ***,we present a model that combines these different *** is based on a separation of the vibrational spectrum and a quantum-mechanical treatment in which the slow modes generate a disorder landscape,while the fast modes generate polaron band *** apply the combined method to 20 organic crystals,including prototypical acenes,thiophenes,benzothiophenes,and their *** mobilities span several orders of magnitude and we find a close agreement to the experimental *** analysis reveals clear correlations to simple mobility predictors and a combination of them can be used to identify high-mobility materials.

关键词： theory semiconductors limit

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Unusual Aggregation Pheromone of the Melanesian Rhinoceros Beetle Scapanes australis BSDV. (Coleoptera,Scarabaeidae)

Unusual Aggregation Pheromone of the Melanesian Rhinoceros B...

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The First Asia—Pacific Conference on Chemical Ecology

作者： Didier ROCHAT Jean-Paul MORIN Titus KAKUL Laurence B EAUDOIN-O LLIVIER Robert P RIOR Christian MALOSSE Isabelle DECRUZ-MALOSSE michel RENOU sebastian E MBUPA INRA Phytopharmacie & Meiateurs ChimiquesRD 1078026 Versailles CedexFrance CIRAD-CP Avenue du Val de MontferrandBP 503534032 Montpellier Cedex 1France

Scapanes austmlis is a major coconut pest,endemic in Papua New Guinea(PNG) and near *** 6-cm long insect has caused a complete stop in the development of coconut in New Britain for the past 15 *** investigated its chemical ecology to work out a new control method using semiochemical-based trapping. Extensive behaviour studies showed that males settled in galleries in coconut palm galleries performed a peculiar calling behaviour early in the night for 1 to 2 hrs:at the gallery entrance,they raised the abdomen and the hind legs and emitted a rectal liquid secretion,rhythmically smeared by crossing the *** amount

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