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矿业工程 1965年第2期 30-33页

作者： r.stahl

本文对巷道掘进时的灌浆方法的优缺点作了具体分析,并与使用各种支柱的加固方法作了比较。位于美国阿里佐钠州的'圣曼努埃尔'铜矿,数年来对平巷、井筒和矿房里的围岩一贯采取硬化的措施。

关键词：平巷围岩岩石巷道掘进岩巷掘进

现代多层螺旋CT用于检测腰椎间盘突出症的准确性

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国际医学放射学杂志 2017年第5期 617-618页

作者： S.Notohamiprodjo r.stahl M.Braunagel P.M.Kazmierczak K.M.Thierfelder K.M.Treitl 于京隔刘鹏涛 Institute for Clinical radiology University Hospital of MunichLMU Munich

摘要目的以MrI作为参考标准评估多层螺旋CT(MDCT)诊断腰椎间盘突出症的准确性。方法对下腰痛病人行MDCT检测(128层MDCT,螺距),60例病人采用迭代重

关键词：腰椎间盘突出症 CT 多层螺旋

体力活动多与少的健康人群以及早期骨关节炎病人的T1rho、T2值和局灶性膝关节软骨异常——3.0T MrI的研究结果

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国际医学放射学杂志 2009年第2期32卷 197-197页

作者： r.stahl A.Luke J.Carballido-Gamio S.Majumdar 蒋涛 Musculoskeletal and Quantitative Imaging Group Department of RadiologyUniversity of California

①评价体力活动多和体力活动少的健康人群以及早期骨关节炎病人的局灶性软骨异常的程度。②确定T2和T1rho的测量对无症状的、体力活动多的人群的局灶性软骨病变的诊断价值。13例无症状、体力活动多的健康人，7例无症状、体力活动少的健... 详细信息

①评价体力活动多和体力活动少的健康人群以及早期骨关节炎病人的局灶性软骨异常的程度。②确定T2和T1rho的测量对无症状的、体力活动多的人群的局灶性软骨病变的诊断价值。13例无症状、体力活动多的健康人，7例无症状、体力活动少的健康人，17例轻度骨关节炎病人，接受了3．0 T Mr膝关节检查。

关键词： MrI 骨关节炎软骨 T1rho弛豫时间 T2弛豫时间

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Mr引导聚焦超声波(MrgFUS)治疗子宫平滑肌瘤临床效果的MrI预测因素:源于一项单中心研究的结果

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国际医学放射学杂志 2015年第4期 391-391页

作者： I.Mindjuk C.G.Trumm P.Herzog r.stahl M.Matzko 孟祥鹿 Department of Diagnostic and Interventional radiology Helios-Amper Klinikum Dachau Dachau Helios-Amper Klinikum Dachau

摘要目的评估聚焦超声波(Mrg FUS)技术及其临床结局和影响其临床治疗成功率的因素。材料与方法共252例子宫平滑肌瘤妇女[平均年龄(42.1±6.9岁)]接受Mrg FUS。所

关键词：子宫平滑肌瘤 Mr MrgFUS 聚焦超声波 MrI

神经血管压迫性三叉神经痛微小神经改变的高空间分辨力扩散张量成像研究

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国际医学放射学杂志 2011年第2期 183-183页

作者： J.Lutz J.Linn J.H.Mehrkens N.Thon r.stahl K.Seelos 唐光健 Departments of Neuroradiology Klinikum GrosshadernLudwig-Maximilians University

目的利用扩散张量成像与解剖MrI共同定位术前检出神经血管压迫性三叉神经痛(TN)病人三叉神经疑有的微小组织改变。材料与方法研究由机构审查委员会批准,

关键词：扩散张量 TN 三叉神经痛口腔颌面部疾病神经

Influence of water evaporation on elastohydrodynamic lubrication with water-containing polyalkylene glycols

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Friction 2024年第10期12卷 2370-2388页

作者： Stefan HOFMANN Thomas LOHNEr Karsten stahl Technical University of Munich School of Engineering and DesignDepartment of Mechanical EngineeringGear Research Center(FZG)Boltzmannstraße 1585748 Garching near MunichGermany

The reduction of frictional power losses in power transmitting gears takes a crucial role in the design of energy-and resource-efficient ***-containing lubricants like glycerol and polyalkylene glycols have shown great potential in achieving friction within the superlubricity regime with coefficients of friction lower than 0.01 under elastohydrodynamic ***,a bio-based production of the base stocks can lead to the development of green ***,one challenge associated with the application of water-containing lubricants to gearboxes is the evaporation of water and its impact on the lubricant *** this study,the influence of water evaporation on elastohydrodynamic friction and film thickness was investigated for three water-containing polyalkylene *** nominal water contents of 20 wt%and 40 wt%and two viscosities were *** results show that the friction increases continuously with higher evaporated water content,while the overall friction level remains low in nearly water-free states.A similar trend is observed for film thickness,where the strong increase in viscosity results in a notable increase in film ***,the sensitivity of friction and film thickness to water evaporation is low for small amounts of evaporated *** allows generous thresholds for permissible variations in water content.

关键词： friction superlubricity aqueous lubrication elastohydrodynamic lubrication(EHL) evaporation polyalkylene glycol

running‑In Behavior of Wet Multi‑plate Clutches:Introduction of a New Test Method for Investigation and Characterization

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Chinese Journal of Mechanical Engineering 2020年第2期33卷 152-160页

作者： Katharina Voelkel Hermann Pflaum Karsten stahl Gear research Centre(FZG) Technical University of MunichGarchingGermany

Wet multi-plate clutches are relevant components of modern drivetrain applications,not only in terms of function but also safety and *** at the beginning of their lifetime,distinct changes of the friction behavior may occur and make the actuation of the clutch *** transcript describes the typical running-in behavior of wet multi-plate clutches and gives a general definition for running-in of ***,a new test method to systematically investigate the running-in behavior of clutches is *** test method contains a test procedure to characterize the running-in behavior on different load ***,a multi-stage procedure to evaluate and characterize the running-in behavior of clutches with mathematical approaches and new characteristic values is *** quality of the test method is demonstrated on the example of three different tribological systems from dual clutch transmissions(DCT)and automatic transmissions(AT)application using paper friction linings.

关键词： Clutch running-in Test method Paper friction lining

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On the experimental characterization of the fluid volume influence on the friction between rough surfaces

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Friction 2023年第7期11卷 1334-1348页

作者： Lukas stahl Michael MÜLLEr Georg-Peter OSTErMEYEr Institute of Dynamics and Vibrations Technische Universität BraunschweigBraunschweig 37106Germany

The load-bearing behaviour of lubricated contacts depends primarily on the normal force,the relative velocity,and the ***,with the aid of the Stribeck curve,it is usually well possible to characterize whether hydrodynamics,mixed friction,or boundary friction is more likely to be *** fact that the load regime can also depend on the fluid quantity is obvious,but has hardly been systematically investigated so *** for contacts with microscopic roughness,the defined application of a very small amount of fluid is a very challenging *** this paper,a very fundamental study shows how a pin-on-disc tribometer can be used to achieve the transition from dry friction via mixed friction to predominant hydrodynamics by the amount of supplied *** experiments are carried out on samples filed with different *** addition,the simultaneous influence of partial filling and normal force as well as relative velocity is also *** good reproducibility has been practically reached over the entire range of the *** the quantities for the coefficient of friction(COF),it was concluded that close to full filling,a reduction of the fluid quantity has a similar effect on the COF as the reduction of the *** property goes along with the common theory of starved lubricated *** behaviour was not observed to the same extent for the normal *** the vicinity of smaller fluid quantities,the COF increases very rapidly with further reduction in fluid quantity,far more disproportionately than that with reduction in *** a deeper understanding of this problem,various practical issues such as idling or the run-up process in bearings can also be studied in a more focused manner.

关键词： starved lubrication Stribeck curve pin-on-disc tribometer fluid supply experimental studies

Numerical Visualization of Grease Flow in a Gearbox

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Chinese Journal of Mechanical Engineering 2023年第2期36卷 220-233页

作者： Hua Liu Florian Dangl Thomas Lohner Karsten stahl School of Engineering&Design Department of Mechanical EngineeringTechnical University of MunichGear Research Center(FZG)BoltzmannstraBe1585748 Garching near MunichGermany

Lubricating greases are widely used in *** gear drives and gearboxes with difficult sealing *** efficiency and heat balance of grease-lubricated gearboxes depend strongly on the lubrication mechanisms channeling and circulating,for which the grease flow is *** computational fluid dynamics opens up the possibility to visualize and understand the grease flow in gearboxes in more *** this study,a single-stage gearbox lubricated with an NLGI 1-2 grease was modeled by the finite-volume method to numerically investigate the fluid *** show that the rotating gears influence the grease sump only locally around the *** a low grease fill volume,the rotation of the gears is widely separated from the grease *** a high grease fill volume,a pronounced geargrease interaction results in a circulating grease flow around the *** simulated grease distributions show good accordance with high-speed camera recordings.

关键词： Lubrication Grease Transmission Gearbox Computational fluid dynamics

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Challenges in determination of microscopic degree of cleanliness in ultra-clean gear steels

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Journal of Iron and Steel research International 2022年第10期29卷 1583-1600页

作者： D.Fuchs T.Tobie K.stahl Gear research Center(FZG) Technical University of Munich85748 GarchingGermany

Shot-peened,case-hardened gears can fail in the tooth root due to crack initiation below the surface of the steel ***,the crack is initiated at a non-metallic inclusion in the center of a so-called *** failure type can lead to a reduced endurance fatigue limit of the *** is for this reason that,over the last decade,much effort has been invested by steel manufacturers to reduce the non-metallic inclusion content of gear steels so as to mitigate or even completely prevent such crack *** ultra-clean gear steels were achieved by various measures in the steel production ***,as a result,the remaining non-metallic inclusions are inhomogeneously distributed in the steel volume in terms of both size and ***,due to the inhomogeneity of ultra-clean steels,the question arose if the values derived according to the standards are still representative of ultra-clean steel *** results show that the standards can still be applied,but more effort must be *** determine the degree of cleanliness,six microsections are currently evaluated according to steel test specification(SEP)1571,method *** is shown that an examination of 24 microsections starting from size class 0 seems beneficial to get more reliable and comparable results of the degree of cleanliness of these ultra-clean gear *** addition,it is shown that a high degree of cleanliness has been achieved for all steel batches investigated with the measures taken in the steel production process.

关键词： Degree of cleanliness Non-metallic inclusion Evaluation of inclusion SEP 1571 DIN 50602 Ultrasonic immersion testing Ultra-clean gear steel Gear