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A multi-stage triaxial testing procedure for low permeable geomaterials applied to Opalinus Clay

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Journal of Rock Mechanics and Geotechnical Engineering 2017年第3期9卷 137-148页

作者： Katrin M. Wild Marco Barla Giovanni Turinetti florian Amann Engineering Geology Group Geological Institute ETH Zürich Sonneggstrasse 5 Zürich 8092 Switzerland Department of Structural Building and Geotechnical Engineering Politecnico di Torino Corso Duca degli Abruzzi 24 Torino 10129 Italy Swiss Competence Center of Energy Research Supply of Electricity (SCCER-SoE) Geological Institute ETH Zürich Sonneggstrasse 5 Zürich 8092Switzerland

In many engineering applications,it is important to determine both effective rock properties and the rock behavior which are representative for the problem’s in situ *** this purpose,rock samples are usually extracted from the ground and brought to the laboratory to perform laboratory experiments such as consolidated undrained(CU)triaxial *** low permeable geomaterials such as clay shales,core extraction,handling,storage,and specimen preparation can lead to a reduction in the degree of saturation and the effective stress state in the specimen prior to testing remains *** changes in structure and the effect of capillary pressure can alter the properties of the specimen and affect the reliability of the test results.A careful testing procedure including back-saturation,consolidation and adequate shearing of the specimen,however,can overcome these *** substantial effort has been devoted during the past decades to the establishment of a testing procedure for low permeable geomaterials,no consistent protocol can be *** a special focus on CU tests on Opalinus Clay,this study gives a review of the theoretical concepts necessary for planning and validating the results during the individual testing stages(saturation,consolidation,and shearing).The discussed tests protocol is further applied to a series of specimens of Opalinus Clay to illustrate its applicability and highlight the key aspects.

关键词： Triaxial test Saturation Consolidation Undrained Opalinus Clay Clay shale

Gender differences in trauma,shock and sepsis

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Military Medical Research 2019年第1期6卷 67-77页

作者： florian Bosch Martin K.Angele Irshad H.Chaudry Department of General Visceraland Transplant SurgeryLudwig Maximilians-University Munich Center for Surgical Research and Department of Surgery University of Alabama at Birmingham

Despite efforts in prevention and intensive care, trauma and subsequent sepsis are still associated with a high mortality rate. Traumatic injury remains the main cause of death in people younger than 45 years and is thus a source of immense social and economic burden. In recent years, the knowledge concerning gender medicine has continuously increased. A number of studies have reported gender dimorphism in terms of response to trauma, shock and ***, the advantageous outcome following trauma-hemorrhage in females is not due only to sex. Rather, it is due to the prevailing hormonal milieu of the victim. In this respect, various experimental and clinical studies have demonstrated beneficial effects of estrogen for the central nervous system, the cardiopulmonary system, the liver, the kidneys, the immune system, and for the overall survival of the host. Nonetheless, there remains a gap between the bench and the bedside. This is most likely because clinical studies have not accounted for the estrus cycle. This review attempts to provide an overview of the current level of knowledge and highlights the most important organ systems responding to trauma, shock and sepsis. There continues to be a need for clinical studies on the prevailing hormonal milieu following trauma, shock and sepsis.

关键词： Trauma-hemorrhage Cardiopulmonary bypass Gender morphism Hormonal milieu Estrogens

Machine learning for exploring small polaron configurational space

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npj Computational Materials 2022年第1期8卷 1183-1191页

作者： Viktor C.Birschitzky florian Ellinger Ulrike Diebold Michele Reticcioli Cesare Franchini University of Vienna Faculty of Physics and Center for Computational Materials ScienceViennaAustria University of Vienna Vienna Doctoral School in PhysicsBoltzmanngasse 51090ViennaAustria Institute of Applied Physics Technische Universität Wien1040ViennaAustria Department of Physics and Astronomy’Augusto Righi’ Alma Mater Studiorum-Universitàdi BolognaBologna40127Italy

Polaron defects are ubiquitous in materials and play an important role in many processes involving carrier mobility,charge transfer and surface *** small polarons’spatial distributions is essential to understand materials properties and ***,the required exploration of the configurational space is computationally demanding when using first principles ***,we propose a machine-learning(ML)accelerated search that determines the ground state polaronic *** ML model is trained on databases of polaron configurations generated by density functional theory(DFT)via molecular dynamics or random *** establish a mapping between configurations and their stability,we designed descriptors modelling the interactions among polarons and charged point *** used the DFT+ML protocol to explore the polaron configurational space for two surface-systems,reduced rutile TiO_(2)(110)and Nb-doped SrTiO_(3)(001).The ML-aided search proposes additional polaronic configurations and can be utilized to determine optimal polaron distributions at any charge concentration.

关键词： configuration polaron charge

Power System Fault Analysis Using Convolutional Neural Networks

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Power System Fault Analysis Using Convolutional Neural Netwo...

作者： florian Rudin 上海交通大学

学位级别：硕士

随着社会的不断进步,电力已经成为人们生活中不可缺少的一部分,它对电力系统的安全性和可靠性提出了更高的要求。在电力系统中,可能一个很小的电力故障会造成大面积的停电事故,给经济的发展造成不可估量的损失。因此可靠的电力系统故障... 详细信息

随着社会的不断进步,电力已经成为人们生活中不可缺少的一部分,它对电力系统的安全性和可靠性提出了更高的要求。在电力系统中,可能一个很小的电力故障会造成大面积的停电事故,给经济的发展造成不可估量的损失。因此可靠的电力系统故障分析是有效解决电力系统故障的重要的依据。发生故障的因素很多,如电力系统设备故障或者决策错误,以及闪电或者洪水等自然灾害。电力系统数据越来越多,这些数据经常包括很多重要的信息,这些信息将有助于进行电力系统分析。近几年,机器学习是很流行的一个研究方向,具有很强大的计算能力。通过机器学习训练神经网络,研究电力系统数据特征提取和系统故障分析。本论文研究用卷积神经网络提取不同系统结构的电力系统数据的特征,仿真结果让我们更好的理解如何用深入学习来分析电力系统故障。仿真研究了数据训练卷积神经网络,这些数据来自不同故障情景(包括故障时间、类型、位置),以及不同负荷和发电情况。使用Matlab和Simulink创建数据样本,用小波分解提取故障分析的重要的频率,为了利用数据监督机器学习,用滑动窗口方法来创建“有故障”或“没有故障”的样本数据。

关键词：电力系统故障分析卷积神经网络深度学习

Early CD8 T-cell memory precursors and terminal effectors exhibit equipotent in vivo degranulation

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Cellular & Molecular Immunology 2015年第4期12卷 400-408页

作者： Yevgeniy Yuzefpolskiy florian M. Baumann Vandana Kalia Surojit Sarkar Center for Molecular Immunology and Infectious Diseases Department of Veterinary and Biomedical Sciences and The Huck Institutes of Life Sciences ThePennsylvania State University University Park PA USA

Early after priming, effector CD8 T cells are distinguished into memory precursor and short-lived effector cell subsets （MPECs and SLECs）. Here, we delineated a distinct in vivo heterogeneity in killer cell lectin-like receptor G1 （KLRG-1） expression, which was strongly associated with diverse MPEC and SLEC fates. These in vivo MPECs and SLECs expressed equivalent levels of cytotoxic molecules and effector cytokines. Using a unique in vivodegranulation assay, we found that the MPECs and SLECs similarly encountered infected target cells and elaborated equivalent levels of cytotoxicity in vivo. These data provide direct in vivoevidence that memory-fated ceils pass through a robust effector phase. Additionally, the preferential localization of the MPECs in the lymph nodes, where a lesser degree of cytotoxicity was elaborated, suggests that the MPECs may be protected from excessive stimulation and terminal differentiation by virtue of their differential tissue localization. These data provide novel mechanistic insights into the linear decreasing potential model of memory differentiation.

关键词： CD8 MPEC SLEC in vivo degranulation effector cytotoxicity

In-situ preparation of robust self-lubricating composite coating from thermally sprayed ceramic template

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Journal of Advanced Ceramics 2023年第2期12卷 357-372页

作者： Zhichao WU Shuangjian LI Xiujuan FAN florian VOGEL Jie MAO Xiaohui TU Institute of Advanced Wear&Corrosion Resistant and Functional Materials Jinan UniversityGuangzhou 510632China Institute of New Materials Guangdong Academy of SciencesNational Engineering Laboratory of Modern Materials Surface Engineering TechnologyGuangzhou 510650China

The self-lubricating ceramic coatings that can control friction and wear have attracted researchers’widespread ***,the poor interfacial bonding between lubricants and ceramics and the deterioration of mechanical properties due to a tribological design limit their practical ***,a robust self-lubricating coating was fabricated by an in-situ synthesis of MoS_(2)/C within inherent defects of thermally sprayed yttria-stabilized zirconia(YSZ)*** edge-pinning by noncoherent endows hybrid coatings with excellent interfacial strength,increasing their hardness(HV)and cohesive ***,owing to the formation of a well-covered robust lubricating film at a frictional interface,a coefficient of friction(COF)can be reduced by 79.6%to 0.15,and a specific wear rate(W)drops from 1.36×10^(−3) to 6.27×10^(−7) mm^(3)·N^(−1)·m^(−1).Combining outstanding mechanical properties and tribological performance,the hybrid coating exhibits great application potential in controlling friction and ***,this strategy of introducing the target materials into the inherent defects of the raw materials to improve the relevant properties opens new avenues for the design and preparation of composite materials.

关键词： self-lubricating ceramic coatings thermal spray in-situ synthesis MoS_(2)/C friction and wear mechanical properties

On the role of surface carbonate species in determining the cycling performance of all-solid-state batteries

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Materials Futures 2022年第2期1卷 116-120页

作者： florian Strauss Seyedhosein Payandeh Aleksandr Kondrakov Torsten Brezesinski Battery and Electrochemistry Laboratory(BELLA) Institute of NanotechnologyKarlsruhe Institute of Technology(KIT)Hermann-von-Helmholtz-Platz 176344 Eggenstein-LeopoldshafenGermany BASF SE Carl-Bosch-Str.3867056 LudwigshafenGermany

This short perspective summarizes recent findings on the role of residual lithium present on the surface of layered Ni-rich oxide cathode materials in liquid-and solid-electrolyte based batteries,with emphasis placed on the carbonate *** and future research opportunities in the development of carbonate-containing protective nanocoatings for inorganic solid-state battery applications are also discussed.

关键词： electrochemical energy storage layered oxide cathode materials protective coatings surface contaminants interfacial chemistry

Editorial for the Special Issue on Unmanned Intelligent Cluster

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Engineering 2022年第5期8卷 1-2页

作者： Jun Zhang Toshio Fukuda Defu Lin florian Holzapfel School of Information and Electronics Beijing Institute of TechnologyBeijing 100081China School of Mechatronical Engineering Beijing Institute of TechnologyBeijing 100081China School of Aerospace Engineering Beijing Institute of TechnologyBeijing 100081China Institute of Flight System Dynamics Technical University of MunichGarching 85748Germany

Recent advances in networked cooperative autonomous sys-tems offer the potential to significantly improve system quality for a wide range of *** in embedded processor,sensor,communication,and networking technology in the last few decades has accelerated interest in networked cooperative autonomous systems,multirobot systems,and distributed sensor networks for applications such as manufacturing,logistics,pro-cess monitoring,enhanced situational awareness,plant safety,inspection,security,and rescue operations.

关键词： robot networks autonomous

Anisotropic Visco-Elastoplastic Modeling of Quasi-Unidirectional Flax Fiber Reinforced Epoxy Behavior:An Investigation on Low-Velocity Impact Response

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Journal of Renewable Materials 2018年第5期6卷 464-476页

作者： Marwa Abida Jamel Mars florian Gehring Alexandre Vivet Fakhreddine Dammak Normandie Univ ENSICAENUNICAENCEACNRSCIMAP14000 CaenFrance Mechanical Modeling and Manufacturing Laboratory(LA2MP) National School of Engineers of SfaxUniversity of SfaxB.P 1173-3038SfaxTunisia Laboratory of Electromechanical Systems(LASEM) National Engineering School of SfaxUniversity of SfaxB.P.1173-3038SfaxTunisia

Based on experimental test results,flax fiber reinforced polymer composites are characterized by nonlinear visco-elastoplastic *** aim of this work is to model the quasi-unidirectional flax fiber reinforced composite behavior through a three dimensional formulation with orthotropic elasticity and orthotropic plasticity using Hill *** isotropic hardening and Johnson Cook parameters are identified from unidirectional tensile tests at different strain *** adjustment of Hill’s yield criterion is developed based on yield stresses obtained in tensile tests at different *** numerical integration of the constitutive equations is implemented in a user-defined material,UMAT subroutines for the commercial finite element code *** model parameters are identified using tensile tests,the model needs to be validated by confronting it with other experimental *** is why experimental and numerical three-point bending tests are carried out in order to validate the proposed model with tests that have not served for the ***,a numerical parametric study on low velocity impact of a flax/epoxy composite circular plate is investigated.

关键词： Visco-elastoplasticity anisotropic behavior impact simulation flax fiber composites