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Influence of liquid layers on energy absorption during particle impact

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Particuology 2009年第4期7卷 245-259页

作者： Sergiy Antonyuk Stefan Heinrich Niels Deen hans Kuipers Hamburg University of Technology Institute of Solids Process Engineering and Particle Technology Denickestr. 15 21071 Hamburg Germany University of Twente Fundamentals of Chemical Reaction Engineering Faculty of Science and Technology PO Box 217 Enschede 7500 AE The Netherlands

The influence of the thickness of a covering liquid layer and its viscosity as well as the impact velocity on energy loss during the normal impact on a flat steel wall of spherical granules with a liquid layer was studied. Free-fall experiments were performed to obtain the restitution coefficient of elastic-plastic γ- Al2O3 granules by impact on the liquid layer, using aqueous solutions of hydroxypropyl methylcellulose with different concentrations for variation of viscosity （1-300 mPa s）, In the presence of a liquid layer, increase of liquid viscosity decreases the restitution coefficient and the minimum thickness of the liquid layer at which the granule sticks to the wall. The measured restitution coefficients were compared with experiments performed without liquid layer. In contrast to the dry restitution coefficient, due to viscous losses at lower impact velocity, higher energy dissipation was obtained, A rational explanation for the effects obtained was given by results of numerically solved force and energy balances for a granule impact on a liquid layer on the wall. The model takes into account forces acting on the granule including viscous, surface tension, capillary, contact, drag, buoyancy and gravitational forces. Good agreement between simulations and experiments has been achieved.

关键词： Granule impact Restitution coefficient Energy dissipation Liquid layer Liquid bridge

Pressure-Temperature Evolution of a Mylonitic Gneiss from the Lower Seve Nappe in the Handol Area,Central Sweden

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Journal of Earth Science 2021年第6期32卷 1496-1511页

作者： Botao Li hans-Joachim Massonne Xiaoping Yuan School of Earth Sciences China University of GeosciencesWuhan430074China Fakultät Chemie Universität Stuttgart70569StuttgartGermany

Ultrahigh-pressure metamorphism has recently been reported from various crustal rocks in the Seve Nappe Complex(SNC)in which microdiamonds were ***,in gneiss from the Lower Seve Nappe(LSN),neither any direct petrographic indication for UHP was reported nor the metamorphic evolution was well *** studied a mylonitic gneiss from the Handol area of the LSN and applied phase-diagram modeling and Ti-in-biotite *** on the compositions of garnet and biotite and observed mineral assemblages,a path was reconstructed passing through about 8 kbar and 730℃at prograde ***-pressure and initial retrograde stages occurred at 9.0–10.2 kbar at 745-775℃,and 7–9 kbar at<750℃,*** ultrahigh-pressure evidence was recognized compatible with medium-pressure metamorphism deduced in earlier studies of gneiss from the *** higher peak pressures were reported recently for metamorphic rocks of the LSN,a possible interpretation is that slices or erased blocks were subducted,metamorphosed at different depths,and exhumed in a subduction ***,the dominant gneiss of the SNC experienced only a medium-pressure metamorphism in the upper part of the downgoing Baltica *** from different depth levels were brought together in an exhumation channel located between Baltica and the overlying plate.

关键词： Lower Seve Nappe Swedish Caledonides mylonitic gneiss P-T pseudosection modeling Ti-in-biotite thermometry metamorphic rocks

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胆道纤维化的发生发展与治疗

中华消化外科杂志 2024年第7期23卷 989-1000页

作者：赵进玉林延延岳平姚佳米宁宁李麻图付文康高龙 Azumi Suzuki Peng F Wong Kiyohito Tanaka Rungsun Rerknimitr Henrik H Junger Tan T Cheung Emmanuel Melloul Nicolas Demartines Joseph W Leung 袁金秋 hans J Schlitt 孟文勃兰州大学第一临床医学院兰州730030 兰州大学第一医院普通外科兰州730030 浜松医学中心消化科日本浜松432-8002 詹姆斯库克大学医院血管外科英国米德尔斯堡TS43BW 京都第二红十字医院消化科日本京都602-8031 朱拉隆功国王纪念医院胃肠内镜卓越中心泰国曼谷10330 雷根斯堡大学医学中心外科德国雷根斯堡93053 香港大学外科学系中国香港999077 洛桑大学医院内脏外科瑞士洛桑CH-1015 加州大学戴维斯分校医学中心和萨克拉门托退伍军人医学中心胃肠肝病科美国萨克拉门托95817 中山大学附属第七医院临床研究中心深圳518107

胆道纤维化(BF)是病理性胆道损伤修复的结果,主要表现为胆管壁的增厚硬化和管腔的进行性狭窄,最终可能导致胆道梗阻、胆汁性肝硬化、肝衰竭、肝胆恶性肿瘤等严重不良结局。目前的研究将BF描述为某些胆管病的病理特征,对其病因、病理生... 详细信息

胆道纤维化(BF)是病理性胆道损伤修复的结果,主要表现为胆管壁的增厚硬化和管腔的进行性狭窄,最终可能导致胆道梗阻、胆汁性肝硬化、肝衰竭、肝胆恶性肿瘤等严重不良结局。目前的研究将BF描述为某些胆管病的病理特征,对其病因、病理生理、分子机制和治疗缺乏系统总结。BF是胆道系统普遍存在但容易被忽略的疾病状态,可能通过病理性胆道损伤后的异常修复机制促进肝胆疾病的发生和进展,笔者结合国内外最新研究进展,综述BF的概念、临床表现、病因、发病机制和治疗策略,为临床医师提供参考。

关键词：胆道疾病纤维化胆管反应病因信号通路治疗

Influence of Fiber Properties and Processing Parameters on Properties of Highloft Nonwoven Bonded by Bicomponent Polyester Fibers

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Journal of Donghua University(English Edition) 2001年第4期18卷 84-87页

作者：任杰顾书英 hans Schreiber Department of Polymer Science and Engineering Tongji University Shanghai 200092 Institute of Textile and Technology Denkendorf Germany

Highloft nonwoven was produced by heat bonding of bicomponent polyester fibers. The effect of fiber properties and processing parameters on the mechanical properties of the nonwoven was investigated. The heat bonding processing parameters for the nonwoven were optimized. The results show that the range of processing temperature is wider while the shell melting point of the bicomponent fibers (Tm1) is lower. The best processing temperature is about 15℃ higher than Tm1 while the shell melting point (Tm1) is higher.

关键词： highloft nonwoven, bicomponent polyester fiber,tear strength, interlayer tear force

The private self and literacy, a synopsis hans Straub traces the development of silent reading and the ' inner voice'

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基础教育外语教学研究 2004年第9期 40-41页

作者： hans Straub

In the English language there are many expressions and words that indicate our high valuation of the individual. Any dictionary will give you several pages of words that have ‘self' as a component. Philosophically, self is synonymous with the ego,but encompasses one's nature, one's uniqueness, in short,one's individuality, which has come to be positively valued in Western culture. In fact, the idea of self and being has become interwoven in Western culture. What accounts for therelatively high valuation placed on the self in the West as compared, a lesser valuation of the same in other, more collectivistic cultures?

关键词：教学大纲读写能力默读法中小学英语阅读技巧

A Pioneer on His Work: An Interview with hans Ulrich Gumbrecht

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Journal of Foreign Languages and Cultures 2022年第2期6卷 4-9页

作者： hans Ulrich Gumbrecht Stanford University

In this interview, hans Ulrich Gumprccht visits some of his groundbreaking theoretical contributions, providing an ample archeological gaze towards the emergence of Digital Humanities. The key concepts proposed by Gumbrccht arc discussed as well as the new theoretical framework he developed over the past two decades towards an understating of Humanities not primarily focused on the semantic attribution of meaning.

关键词： Materialities of Communication Production of Presence Non-Hcrmcncutic Field Stimmung

From Single Droplet to Column Design

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Tsinghua Science and Technology 2006年第2期11卷 212-216页

作者： hans-Jrg Bart Institute of Thermal Process Engineering TU Kaiserslautern D-67653 Kaiserslautern Germany

The technique state to design counter-current extraction columns is based on the performance of pilot plant experiments. The modelling is then either with the equilibrium or dispersion model, whereas in the latter the dispersion coefficient accounts for all hydrodynamic non-idealities. A new approach uses single droplet experiments to obtain the basic laws and functions governing droplet breakage, coalescence, relative velocity, and axial dispersion when using droplet populance balance models （DPBM）. The hydrodynamics simulation results show that the mean Sauter diameter, hold-up, and concentration profiles could be well predicted, which promotes the use of DPBM models for further applications in industrial scale.

关键词： single droplet column design countercurrent extraction droplet populance balance model

MULTIVARIABLE FINITE ELEMENTS:CONSISTENCY AND OPTIMIZATION

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Science China Mathematics 1991年第3期34卷 284-299页

作者：吴长春 hans BUFLER Institute fur Mechanik (Bauwesen) Universitat Stuttgart Pfaffenwaldring 7 7000 Stuttgart 80 West Germany Department of Modern MechanicsUniversity of Science and Technology of ChinaHefeiChina. Institute für Mechanik (Bauwesen) Universitat Stuttgart Pfaffenwaldring 7 7000 Stuttgart 80 West Germany

A nonlinear analysis of the energy consistency of multivariable finite elements based onincompatible trial functions is presented. The nonlinear forms of the convergence and opti-mization condition are set up. The relevant optimization approach for hybrid elements andthe optimal parameter matching is suggested and applied to the 3-dimensional problem ofelasticity.

关键词： energy consistency condition element optimization condition optimizing pattern optimal parameter matching.

Micromechanical adaptation as a treatment for spinal cord injury

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Neural Regeneration Research 2019年第11期14卷 1909-1911页

作者： Veronica estrada hans werner Müller Molecular Neurobiology Laboratory Department of Neurology Heinrich-Heine-University Medical Center Düsseldorf

Spinal cord injury: Thus far injury of the spinal cord is incurable and, in the majority of cases, a devastating and life-changing event. The worldwide incidence rate of spinal cord injury (SCI) ranges from 250,000 to 900,000 (***, 2013;Kumar et al., 2018) new cases per year. SCI outcome includes the damage of axons, demyelination of axons, loss of signal transduction, and consequential long-lasting motor and sensory deficits. Additionally, the non-use of muscles can lead to atrophy and joint contractures, thereby further reducing the possibility of recovery. Depending on the spinal level and the severity of the injury, the extent of the damage can vary and spontaneous recovery is possible to varying degrees.

关键词： Micromechanical adaptation spinal cord injury spinal cord injury(SCI)