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The effect of ethanol fuel dilution on oil performance and MoDTC tribofilms formation and composition

Friction 2024年第9期12卷 2108-2125页

作者： Juan RUIZ-ACERO felipe kessler Henara COSTA Tiago COUSSEAU Polytechnic School Universidade de São PauloSão Paulo 05508-030Brazil School of Food and Chemistry Universidade Federal do Rio GrandeRio Grande 96203-000Brazil School of Engineering Universidade Federal do Rio GrandeRio Grande 96203-900Brazil Mechanical Engineering Department Univ.Tecnológica Federal do ParanáCuritiba 81280-340Brazil University of Newcastle CallaghanSW 2308Australia

Ethanol has emerged as a promising alternative to fossil fuels,but its use can lead to significant dilution in lubricants,particularly during cold start or heavy *** dilution can affect the performance of additives,including friction modifiers like molybdenum dithiocarbamate(MoDTC),which are designed to reduce friction under extreme contact *** research suggests that ethanol may impact the performance of MoDTC,prompting this study’s goal to investigate the effects of ethanol on MoDTC tribofilms and their friction response under boundary lubrication ***,reciprocating tribological tests were performed with fully formulated lubricants containing MoDTC with varying ethanol *** results indicate that a critical ethanol dilution level inhibits friction reduction by MoDTC activation,resulting in friction coefficients(COFs)similar to the base *** tested with simple mixtures of polyalphaolefin(PAO)+MoDTC showed increased COFs with added *** of tested surfaces using Raman spectroscopy,X-ray photoelectron spectroscopy(XPS),and X-ray absorption spectroscopy near the edge structure(XANES)revealed the presence of sulfates,MoO_(3),MoS_(2),and MoS_(x)O_(y)compounds in the tribofilms formed on the surfaces,with and without ethanol diluted in the ***,the addition of ethanol increased the sulfates and MoO_(3)content of the tribofilms at the expense of friction-reducing compounds such as MoS_(2)and MoS_(x)O_(y).These findings suggest that ethanol dilution in lubricants containing MoDTC creates an oxygen-rich interfacial medium that favors the formation of compounds with insufficient friction-reducing capabilities.

关键词： molybdenum dithiocarbamate(MoDTC) ethanol tribofilm friction modifier additive lubricant

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A comparative study on design standards of screw conveyors in China,Germany,and the USA–Part II:Discrete element method

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Particuology 2024年第9期92卷 113-125页

作者： Yuan Tan Michael Rackl Weijie Yang Johannes Fottner Wenjun Meng Stephan kessler Technical University of Munich Chair for Materials HandlingMaterial FlowLogisticsGarchingGermany Ibracon–Ingenieurbüro Dr.-Ing.Rackl ZornedingGermany School of Mechanical Engineering Taiyuan University of Science and TechnologyTaiyuanChina

This part of the study aims to evaluate the advantages and disadvantages of technical standards of screw conveyors in China,Germany,and the USA for industrial *** source or determination method of empirical coefficients as well as the theoretical foundation of dimensioning-relevant diagrams in these standards is not explicitly documented in the ***,instead of less efficient on-site tests,the numerical simulation by discrete element method is *** on the geometrical and operational designs determined in three standards for horizontal,slightly inclined,and vertical conveyance of three representative bulk solids(barley,lignite,and sand),the potential influencing factors are *** constant particle and contact parameters,the potential deviations caused by particle models are ***,the accuracy of power consumption calculation of each standard and the divergence between accessible and required mass flows is comprehensively assessed based on the analysis of simulated *** main conclusions are drawn:(1)Particle fall back is barely considered by all three standards and leads to overestimated mass throughput;(2)The decrease in mass throughput caused by an increasing degree of filling can be compensated by slowing down the rotational speed.

关键词： Discrete element method Design standard Screw conveyor Screw auger Bulk solid

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Optical probing of ultrafast laser-induced solid-to-overdense-plasma transitions

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Light(Science & Applications) 2024年第5期13卷 973-984页

作者： Yasmina Azamoum Georg Alexander Becker Sebastian Keppler Guillaume Duchateau Stefan Skupin Mickael Grech Fabrice Catoire Sebastian Hell Issa Tamer Marco Hornung Marco Hellwing Alexander kessler Franck Schorcht Malte Christoph Kaluza GSI Helmholtzzentrum für Schwerionenforschung Planckstr.164291 DarmstadtGermany. Helmholtz Institute Jena Fröbelstieg 307743 JenaGermany. Institute of Optics and Quantum Electronics Friedrich-SchillerUniversität JenaMax-Wien-Platz 107743 JenaGermany. CEA-CESTA 15 Avenue des SablièresCS6000133116 Le BarpCedexFrance Institut Lumière Matière UMR 5306-CNRSUniversitéde Lyon 169622 VilleurbanneFrance. LULI CNRSCEASorbonne UniversitéInstitut Polytechnique de ParisPalaiseauFrance. Universitéde Bordeaux-CNRS-CEA CELIAUMR 5107 TalenceFrance

Understanding the solid target dynamics resulting from the interaction with an ultrashort laser pulse is a challenging fundamental multi-physics problem involving atomic and solid-state physics,plasma physics,and laser *** of the initial interplay of the underlying processes is essential to many applications ranging from lowpower laser regimes like laser-induced ablation to high-power laser regimes like laser-driven ion *** the properties of the so-called pre-plasma formed as the laser pulse’s rising edge ionizes the target is complicated from the theoretical and experimental point of view,and many aspects of this laser-induced transition from solid to overdense plasma over picosecond timescales are still open *** the one hand,laser-driven ion acceleration requires precise control of the pre-plasma because the efficiency of the acceleration process crucially depends on the target properties at the arrival of the relativistic intensity peak of the *** the other hand,efficient laser ablation requires,for example,preventing the so-called“plasma shielding”.By capturing the dynamics of the initial stage of the interaction,we report on a detailed visualization of the pre-plasma formation and ***-thin diamond-like carbon foils are shown to transition from solid to plasma during the laser rising edge with intensities<10^(16)W/cm^(2).Single-shot near-infrared probe transmission measurements evidence sub-picosecond dynamics of an expanding plasma with densities above 10^(23)cm^(−3)(about 100 times the critical plasma density).The complementarity of a solid-state interaction model and kinetic plasma description provides deep insight into the interplay of initial ionization,collisions,and expansion.

关键词： laser acceleration solid

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Fitness consequences of a clock pollinator filter in Nicotiana attenuata flowers in nature

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Journal of Integrative Plant Biology 2017年第11期59卷 805-809页

作者： felipe yon danny kessler youngsung joo sang-gyu kim ian t.baldwin department of molecular ecology max planck institute for chemical ecologyHans-Knoll-StraBe 8D-07745 JenaGermany center for genome engineering institute for basic scienceYuseong-gu34047 DaejeonSouth Korea

Nicotiana attenuata flowers, diurnally open,emit scents and move vertically to interact with nocturnal hawkmoth and day-active hummingbird pollinators. To examine the fitness consequences of these floral rhythms, we conducted pollination trials in the plant’s native habitat with phase-shifted flowers of plants silenced in circadian clock genes. The results revealed that some pollination benefits observed under glasshouse conditions were not reproduced under natural field conditions. Floral arrhythmicity increased pollination success by hummingbirds, while reducing those by hawkmoths in the field. Thus, floral circadian rhythms may influence a plant’s fitness by filtering pollinators leading to altered seed set from outcrossed pollen.

关键词： Fitness consequences a clock pollinator filter in Niicotiana attenuata flowers in nature

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Fitness consequences of altering floral circadian oscillations for Nicotiana attenuata

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Journal of Integrative Plant Biology 2017年第3期59卷 180-189页

作者： felipe Yon Danny kessler Youngsung Joo Lucas Cortes Llorca Sang-Gyu Kim Ian T. Baldwin Department of Molecular Ecology Max Planck Institute for Chemical Ecology Hans-Knoll-Straβe 8 D-07745 Jena Germany Center for Genome Engineering Institute for Basic Science Yuseong-gu 34047 Daeieon South Korea

Ecological interactions between flowers and pollinators are all about timing. Flower opening/closing and scent emissions are largely synchronized with pollinator activity, and a circadian clock regulates these rhythms. However, whether the circadian clock increases a plant＇s reproductive success by regulating these floral rhythms remains untested. Flowers of Nicotiana attenuata, a wild tobacco, diurnally and rhythmically open, emit scent and move vertically through a 140° arc to interact with nocturnal hawkmoths. We tethered flowers to evaluate the importanceof flower positions for Manduca flower position dramatically sexta-mediated pollinations; nfluenced pollination. We examined the pollination success of phase-shifted flowers, silenced in circadian clock genes, NaZTL, NaLHY, and NaTOCI, by RNAi. Circadian rhythms in N. attenuata flowers are responsible for altered seed set from outcrossed pollen.

关键词： Yonggen Lou Zhejiang University China

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深度神经网络结合迁移学习和基因遗传算法加速金属团簇结构全局优化

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Chinese Journal of Chemical Physics 2024年第2期37卷 321-329,I0010-I0021,I0104页

作者：杨祁李子玉 Peter L.Rodriguez-kesslerbr 何圣贵中国科学院化学研究所动态与稳态结构化学国家重点实验室北京100190 墨西哥光学研究中心瓜纳华托37150 中国科学院大学北京100049 北京分子科学国家研究中心中国科学院分子科学科教融合卓越创新中心北京100190

在团簇科学中,搜索金属团簇的全局最小能量结构具有重要的意义.最近,深度神经网络结合迁移学习的全局优化方法被开发出来,以提高金属团簇结构的优化效率,该方法可以大幅减少训练深度神经网络所需的样本数量.为了进一步提高势能面的采样... 详细信息

在团簇科学中,搜索金属团簇的全局最小能量结构具有重要的意义.最近,深度神经网络结合迁移学习的全局优化方法被开发出来,以提高金属团簇结构的优化效率,该方法可以大幅减少训练深度神经网络所需的样本数量.为了进一步提高势能面的采样效率和深度神经网络结合迁移学习的全局优化方法的全局搜索能力,本文提出了一种将基因遗传算法嵌入到深度神经网络结合迁移学习中的全局优化方法.在Pt_(n)(n=9-15)团簇的全局优化中,该方法只需要深度神经网络结合迁移学习的全局优化方法一半的样本数量就能优化得到全局最优结构,同时节省了约70%~80%的计算成本,这表明全局搜索能力的显著提升。在Pt_(14)团簇势能面上的采样结果显示,该方法搜索到低能量的样本(占比25%)比深度神经网络结合迁移学习方法的样本(占比<1%)更多.在Pt_(16)和Pt_(17)团簇的全局最优结构搜索中,本文报道了文献中尚未报道的新结构,证明本论文建立的方法的可行性和先进性.

关键词：全局优化深度神经网络迁移学习基因遗传算法金属团簇铂

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Study on the Bleaching Mechanism of Indigo-carmine Catalyzed by Laccase Using EFA and MCR-ALS Methods

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Chinese Chemical Letters 2003年第5期14卷 505-508页

作者： HuaLI FangZHANG W.kessler R.W.kessler InwtituteofAnalyticalScience NorthwestUniversityXi‘an710069 InstituteofAppliedResearch ReutlingenUniversityofAppliedSciencesAlteburgstrasse150D-72760ReutlingenGermany

The bleaching of indigo-carmine catalyzed by laccase was monitored on-line by UV/Vis spectroscopy. The resulted data were analyzed by evolving factor analysis (EFA) and multivariate curve resolution (MCR), and the re... 详细信息

关键词： Chemometrics process analysis EFA MCR-ALS.

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The evolving ENSO observing system

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National Science Review 2018年第6期5卷 805-807页

作者： Dake Chen Neville Smith William kessler State Key Laboratory of Satellite Ocean Environment Dynamics Second Institute of Oceanography

El Nio–Southern Oscillation (ENSO)is by far the most energetic and influential short-term climate variability on our planet, originating from an instability of the large-scale ocean-atmosphere interaction in the tr... 详细信息

关键词： The evolving ENSO observing system TAO

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Recent results of laparoscopic surgery in inflammatory bowel disease

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World Journal of Gastroenterology 2011年第9期17卷 1116-1125页

作者： Hermann kessler Jonas Mudter Werner Hohenberger Department of Surgery University of Erlangen Department of Internal Medicine 1 GastroenterologyUniversity of Erlangen

Inflammatory bowel diseases are an ideal indication for the laparoscopic surgical approach as they are basically benign diseases not requiring lymphadenectomy and extended mesenteric excision;well-established surgical procedures are available for the conventional *** alterations and fragility of the bowel and mesentery,however,may demand a high level of laparoscopic experience.A broad spectrum of operations from the rather easy enterostomy formation for anal Crohn’s disease(CD)to restorative proctocolectomies for ulcerative colitis(UC)may be managed *** current evidence base for the use of laparoscopic techniques in the surgical therapy of inflammatory bowel diseases is *** limited to the terminal ileum has become a common indication for laparoscopic surgical *** severe anal CD, laparoscopic stoma formation is a standard procedure with low morbidity and short operative *** comparing conventional and laparoscopic bowel resections,have found shorter times to first postoperative bowel movements and shorter hospital stays as well as lower complication rates in favour of the laparoscopic *** complicated cases with previous surgery,abscess formation and enteric fistulas may be op-erated on laparoscopically with a low *** UC, restorative proctocolectomy is the standard procedure in elective *** demanding laparoscopic approach is increasingly used,however,mainly in major centers; its feasibility has been proven in various *** increased body mass index and acute inflammation of the bowel may be relative *** and longterm outcomes like quality of life seem to be equivalent for open and laparoscopic *** studies have proven that the laparoscopic approach to CD and UC is a safe and successful alternative for selected patients. The appropriate selection criteria are still under *** considerations are playing an important role for the co

关键词： Crohn’s disease Ulcerative colitis Laparoscopic Colorectal Surgery

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CHLORAD: Eradicating Translocon Components from the Outer Membrane of the Chloroplast

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Molecular Plant 2019年第4期12卷 467-469页

作者： Venkatasalam Shanmugabalaji Felix kessler Laboratory of Plant Physiology University of Neuchatel 2000 Neuchatel Switzerland

Around 100 proteins are produced inside the chloroplast but the vast majority must be imported. These proteins are synthesized in the cytosol as preproteins with cleavable targeting sequences. Several plastid types other than chloroplasts exist. During plant development, one plastid type may be converted to another, a process referred to as plastid transition (Jarvis and Lopez-Juez, 2013). During plastid transitions, proteome remodeling occurs, and one set of imported proteins is replaced by another that is functionally adapted (Kleffmann et al., 2007). Moreover, plastid proteomes are known to be regulated in an environmentdependent fashion, and chloroplasts may respond to changing light conditions by regulating the composition and abundance of photosynthetic complexes.

关键词： CHLORAD Eradicating Translocon Components Outer Membrane Chloroplast

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