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Ultrathin coating of particles in fluidized bed using submicron droplet aerosol

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Particuology 2020年第6期18卷 23-29页

作者： Maksim Mezhericher christian Rieck Nikolay Razorenov Evangelos Tsotsas Mechanical and Aerospace Engineering Princeton UniversityPrincetonNJ 08544USA Thermal Process Engineering Otto-von-Guericke University39106 MagdeburgGermany Mechanical Engineering Shamoon College of EngineeringBeer Sheva84100Israel

In this work,we demonstrate that particles can be coated in a fluidized bed w让h coating solution provided by a novel aerosol *** droplets are smaller than 1 pim in volume-based diameter,hence they are very much smaller than droplets in conventional spray fluidized bed processes(around 40μm).A proof-of-principle experiment with 30%aqueous coating solution of sodium benzoate and γ-Al2O3 core particles in 150 mm fluidized bed fed with droplet aerosol supplied from the chamber side is *** simultaneously coat and dry the particles,inlet of fluidization air was at 50℃ .Moreover,Monte Carlo simulations of coating with small aerosol and large spray droplets were *** to dramatically smaller building blocks,ultrathin particle coating of high-resolution(very small layer thickness)can be attained with the new aerosol process,with the potential of even going *** coverage of particles is reached substantially faster than in the conv entional process,so that material dema nd is much lower and sensitive materials can be processed in short reside nee *** yield of around 30%was much higher than expected,that is considered to be technically viable and may be enhanced by the recycling of entrained solids or better equipment design.

关键词： Aerosol Fluidized bed Particle Submicron droplet Ultrathin coating

Pollination interactions reveal direct costs and indirect benefits of plant-plant facilitation for ecosystem engineers

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Journal of Plant Ecology 2020年第1期13卷 107-113页

作者： Gianalberto Losapio christian Schöb Department of Evolutionary Biology and Environmental Studies University of ZurichZurichSwitzerland Department of Environmental Systems Science ETH ZurichZurichSwitzerland

Aims Ecosystem engineers substantially modify the environment via their impact on abiotic conditions and the biota,resulting in facilitation of associated species that would not otherwise ***,reciprocal effects are poorly understood as studies of plant–plant interactions usually estimate only benefits for associated species,while how another trophic level may mediate direct and indirect feedback effects for ecosystem engineers is hardly *** We ran a field experiment with two ecosystem engineers(Arenaria tetraquetra and Hormathophylla spinosa)blooming either alone or with associated plants to decompose net effects and to test the hypothesis that pollinator-mediated interactions provide benefits that balance costs of facilitation by ecosystem *** Findings We found that net costs of facilitation are accompanied by pollinator-mediated *** ecosystem engineers producing fewer flowers per plant,they were visited by more and more diverse pollinators per flower when blooming with associated plants than when blooming *** seed production per plant was higher when ecosystem engineers bloomed alone,fruit set and seed set varied between *** one case(***),fruit and seed sets were negatively affected by the presence of associated plants,whereas,in another case(***),fruit set and seed set were higher and unaffected when ecosystem engineers bloomed with associated plants,*** findings suggest that besides experiencing direct costs,ecosystem engineers can also benefit from facilitating other species via increasing their own visibility to ***,we highlight that pollination interactions can compensate for costs of facilitation depending on ecosystem engineer *** study illuminates how the outcome of direct plant–plant interactions might be mediated by indirect interactions including third players.

关键词： biodiversity commensalism ecosystem engineering mutualism niche construction three-way interactions

Anticancer Properties of Lobetyolin,an Essential Component of Radix Codonopsis(Dangshen)

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Natural Products and Bioprospecting 2021年第2期11卷 143-153页

作者： christian Bailly OncoWitan 59290 Lille(Wasquehal)France

Lobetyolin(LBT)is a polyacetylene glycoside found in diverse medicinal plants but mainly isolated from the roots of Codo-nopsis pilosula,known as Radix Codonopsis or *** traditional Chinese medicinal preparations containing Radix Codonopsis were identified;they are generally used to tonify spleen and lung Qi and occasionally to treat *** we have reviewed the anticancer properties of Codonopsis extracts,LBT and structural *** and lobetyolinin are the mono-and bis-glucosylated forms of the polyacetylenic compound *** and LBT have shown activi-ties against several types of cancer(notably gastric cancer)and we examined the molecular basis of their activity.A down-regulation of glutamine metabolism by LBT has been evidenced,contributing to drug-induced apoptosis and tumor growth *** markedly reduces both mRNA and protein expression of the amino acid transporter Alanine-Serine-Cysteine Transporter 2(ASCT2).Other potential targets are proposed here,based on the structural analogy with other anticancer *** and related polyacetylene glycosides should be further considered as potential anticancer agents,but more work is needed to evaluate their efficacy,toxicity,and risk-benefit ratio.

关键词： Cancer therapy Natural products Mechanism of action Molecular target Terpenoids Lobetyolin Polyacetylene glycoside Glutamine metabolism

Xihuang Pills,a Traditional Chinese Preparation used as a Complementary Medicine to Treat Cancer:An Updated Review

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World Journal of Traditional Chinese Medicine 2020年第2期6卷 152-162页

作者： christian Bailly OncoWitan Lille(Wasquehal)59290France

The traditional Chinese medicine,Xihuang pills(XHP),has long been used for the management of cancers,both to limit tumor cells proliferation and dissemination,and to protect nontumor cells from damages induced by conventional therapeutic *** is made from two plant extracts(from Boswellia carteri and Commiphora myrrha)and two animal-derived products(from Moschus moschiferus and Calculus bovis).Recent advances into the mechanism of action of XHP and its clinical efficacy are reviewed here to highlight its potential to treat breast and colon cancers in *** immunoregulatory effects of XHP are *** traditional medicinal preparations containing Boswellia and Commiphora are discussed,as well as the activities of the major natural products found in XHP including abietic acid,acetyl-keto-boswellic acid,and *** and clinical studies of XHP and similar medicinal preparations,such as the Korean medicine Hang Am Dan-B,are encouraged.

关键词： Anticancer drugs cancer therapy natural products traditional Chinese medicine

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Ecology and eScience

Ecological Processes 2012年第1期1卷 124-128页

作者： christian Mulder National Institute for Public Health and the Environment(RIVM) Antonie van Leeuwenhoeklaan 9Bilthoven3720 BAThe Netherlands

Comprehending the gifts of ecology Stress ecology,climate change,human well-being,and global sustainability are popular items(Naeem et al.2009).Given all the challenges in a developing world where the global populatio... 详细信息

关键词： ecology global

GLOBAL WEAK SOLUTIONS FOR A NONLINEAR HYPERBOLIC SYSTEM

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Acta Mathematica Scientia 2020年第5期40卷 1185-1194页

作者： Qingyou SUN Yunguang LU christian KLINGENBERG K.K.Chen Institute for Advanced Studies Hangzhou Normal UniversityHangzhou 311121China Department of Mathematics Wuerzburg UniversityWuerzburg 97070Germany

In this paper, we study the global existence of weak solutions for the Cauchy problem of the nonlinear hyperbolic system of three equations(1.1) with bounded initial data(1.2). When we fix the third variable s, the system about the variables ρ and u is the classical isentropic gas dynamics in Eulerian coordinates with the pressure function P(ρ, s) = ese-1/ρ,which, in general, does not form a bounded invariant region. We introduce a variant of the viscosity argument, and construct the approximate solutions of(1.1) and(1.2) by adding the artificial viscosity to the Riemann invariants system(2.1). When the amplitude of the first two Riemann invariants(w1(x, 0), w2(x, 0)) of system(1.1) is small,(w1(x, 0), w2(x, 0)) are nondecreasing and the third Riemann invariant s(x, 0) is of the bounded total variation, we obtained the necessary estimates and the pointwise convergence of the viscosity solutions by the compensated compactness theory. This is an extension of the results in [1].

关键词： global weak solutions viscosity method compensa ted compac tn ess

Translation and Time： A Memento of the Curvature of the Poststructuralist Plane

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Frontiers of Literary Studies in China-Selected Publications from Chinese Universities 2012年第3期6卷 426-468页

作者： christian Uhl Department for South and East Asian Languages and Cultures Ghent University Ghent 9000 Belgium

Ever since Derrida＇s appropriation of Walter Benjamin＇s ＂The Task of the Translator,＂ and the deconstruction of the traditional notion of translation as an unequivocal communication of meaning, ＂translation＂ has become a powerful conceptual means in many fields of the humanities to underscore the agency of the subalterns in the context of colonialism, imperialism, or globalization, and to emphasize historical contingency over against necessity. As a matter of consequence, however, the question of the historically specific condition of the possibility of such ＂translation＂ has been largely neglected. In this essay I will argue, that a profound understanding of the processes of social and cultural transformation, which have been conceptualized in terms of ＂translation,＂ can not be achieved unless global capitalism and its specific temporal dynamics are taken into consideration more seriously. Finally, this approach will also enable us to re-read Benjamin, and to reassess the significance of his ＂Task＂ for a more powerful critique of a social formation, ＂which produces commodities.＂

关键词： translation culture capital time deconstruction Karl Marx Moishe Postone Walter Benjamin

Ray tracing particle image velocimetry-Challenges in the application to a packed bed

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Particuology 2024年第1期84卷 194-208页

作者： Christin Velten Mirko Ebert christian Lessig Katharina Zahringer Lehrstuhl für Strömungsmechanik und Strömungstechnik Otto-von-Guericke-Universität Magdeburg39106MagdeburgGermany Institut für Simulation und Graphik Otto-von-Guericke-Universität Magdeburg39106MagdeburgGermany

Ray tracing Particle Image Velocimetry(RT-PIV)is an optical technique for high resolution velocity measurements in challenging optical systems,such as transparent packed beds,that uses ray tracing to correct for distortions introduced by transparent geometries in the light *** ray tracing based correction is a post processing step applied to the raw PIV particle images before classical PIV *** this study,RT-PIV is performed in the top layer of a body centred cubic(bcc)sphere packing with gaseous flow,where optical access is obtained by the use of transparent N-BK7 glass balls with a diameter of d=40 ***-PIV introduces new experimental and numerical challenges,for example a limited field of view,illumination difficulties,a very large required depth of field and high sensitivity to geometric parameters used in the ray tracing *** challenges and their implications are the main scope and discussed in the present ***,the validation of the ray tracing reconstruction step is presented and examples for the obtained corrected vector fields in a packed bed are *** results show the strength of the method in reconstructing velocity fields behind transparent spheres that would not have been accessible by optical measurement techniques without the ray tracing correction.

关键词： Ray tracing particle image velocimetry(RT-PIV) Transparent spherical particles Packed bed Distortion correction Gas flow

3D-Printed PLA Filaments Reinforced with Nanofibrillated Cellulose

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Journal of Renewable Materials 2020年第7期8卷 759-772页

作者： Matea Perić Robert Putz christian Paulik Wood K Plus-Competence Center for Wood Composites&Wood Chemistry Kompetenzzentrum Holz GmbHLinzA-4040Austria Institute for Chemical Technology of Organic Materials Johannes Kepler University LinzLinz4040Austria

In the current study poly(lactic acid)PLA composites with a 3 wt%and 5 wt%of nanofibrillated cellulose(NFC)were produced by 3D-printing *** enzymatic pretreatment coupled with mechanical fibrillation in a twin screw extruder was used to produce high consistency *** electron microscopy(SEM)equipped with Fibermetric software,FASEP fiber length distribution analysis,Furrier transform infrared spectroscopy(FT-IR),thermogravimetric analysis(TGA),tensile tests,impact tests and differential scanning calorimetry were used to characterize NFC and PLA/NFC *** results of the fiber length and width measurements together with the results of the SEM analysis showed that enzymatic hydrolysis coupled with a twin screw extrusion could effectively reduce the diameter and length of cellulose *** produced NFC consisted of microand nanosized fibers entangled in a characteristic *** on the FT-IR analysis,no new bonds were formed during the enzymatic hydrolysis or fibrillation *** TGA analysis confirmed that produced NFC can be used in hightemperature extrusion processing without NFC *** the PLA/NFC composites preparation the NFC agglomerates were formed,which negatively influenced PLA/NFC composites impact *** slightly improved tensile strength and elastic modulus were reported for all composites when compared to the neat *** elongation at break was not affected by the NFC *** significant differences in thermal stability were detectable among composites nor in comparation with the neat ***,the crystallinity degree of the composite containing 5 wt%NFC was increased in respect to the neat PLA.

关键词： Nanofibrillated cellulose enzymatic hydrolysis twin screw extruder poly(lactic acid) 3D-printing