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Raman spectroscopy of isolated carbyne chains confined in carbon nanotubes:Progress and prospects

2013年

作者： lechner Florian

来源：畅想之星图书光盘版（南... 评论

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Chinese Physics B 2022年第12期31卷 532-542页

作者： Johannes M.A.lechner Pablo Hernández López Sebastian Heeg Institut fur Physik and IRIS Adlershof Humboldt Universitat zu Berlin12489 BerlinGermany

Carbyne is an infinitely long linear chain of carbon atoms with sp1hybridization and the truly one-dimensional allotrope of *** obtaining freestanding carbyne is still an open challenge,the study of confined carbyne,linear chains of carbon encapsulated in carbon nanotubes,provides a pathway to explore carbyne and its remarkable properties in a well-defined *** this review,we discuss the basics and recent advances in studying single confined carbyne chains by Raman spectroscopy,which is their primary spectroscopic characterization *** highlight where single carbyne chain studies are needed to advance our understanding of confined carbyne as a material system and provide an overview of the open questions that need to be addressed and of those aspects currently under debate.

关键词： carbyne linear carbon chains carbon nanotubes Raman spectroscopy

Sifu-a cybersecurity awareness platform with challenge assessment and intelligent coach

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Cybersecurity 2018年第1期1卷 945-967页

作者： Tiago Espinha Gasiba Ulrike lechner Maria Pinto-Albuquerque Siemens AG Corporate Technology Otto-Hahn-Rin 681379 MunichBavariaGermany Universitat der Bundeswehr München MunichGermany Instituto Universitario de Lisboa(ISCTE-IUL) ISTAR-IULLisbonPortugal

Software vulnerabilities,when actively exploited by malicious parties,can lead to catastrophic *** handling of software vulnerabilities is essential in the industrial context,particularly when the software is deployed in critical ***,several industrial standards mandate secure coding guidelines and industrial software developers’training,as software quality is a significant contributor to secure *** Challenges(CSC)form a method that combines serious game techniques with cybersecurity and secure coding guidelines to raise secure coding awareness of software developers in the *** cybersecurity awareness events have been used with success in industrial ***,until now,these coached events took place *** the present work,we briefly introduce cybersecurity challenges and propose a novel platform that allows these events to take place *** introduced cybersecurity awareness platform,which the authors call Sifu,performs automatic assessment of challenges in compliance to secure coding guidelines,and uses an artificial intelligence method to provide players with solution-guiding ***,due to its characteristics,the Sifu platform allows for remote(online)learning,in times of social *** CyberSecurity Challenges events based on the Sifu platform were evaluated during four online real-life CSC *** report on three surveys showing that the Sifu platform’s CSC events are adequate to raise industry software developers awareness on secure coding.

关键词： Cybersecurity Awareness Training Artificial intelligence Serious games Secure coding Static application security testing Capture-the-flag Software development in industry

The potentially crucial role of quasi-particle interferences for the growth of silicene on graphite

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Nano Research 2020年第9期13卷 2378-2383页

作者： Fatme Jardali Christoph lechner Maurizio De Crescenzi Manuela Scarselli Isabelle Berbezier Paola Castrucci Holger Vach LPICM CNRSEcole PolytechniqueIP ParisPalaiseau 91128France Dipartimento di Fisica Universita di Roma"Tor Vergata"Roma 00133Italy CNRS Aix-Marseille UniversiteIM2NPMarseille 13397France

A comprehensive picture of the initial stages of silicene growth on graphite is *** is shown that quasiparticle interferences play a crucial role in the formation of the observed silicene *** propose,on one hand,that the charge modulations caused by those quantum interferences serve as templates and guide the incoming Si atoms to self-assemble to the unique(√3 x√3)R30°honeycomb atomic *** the other hand,their limited extension limits the growth to about 150 Si atoms under our present deposition *** here proposed electrostatic interaction finally explains the unexpected stability of the observed silicene islands over time and with *** the robust guiding nature of those quantum interferences during the early growth phase,we demonstrate that the window of experimental conditions for silicene growth is quite narrow,making it an extremely challenging experimental ***,it is shown that the experimentally observed threedimensional silicon clusters might very well be the simple result of the end of the silicene growth resulting from the limited extent of the quasi-particle interferences.

关键词： silicene growth highly oriented pyrolytic graphite(HOPG) ab initio calculations scanning tunneling microscopy(STM) quasi-particle interferences two-dimensional(2D)self-assembly

Long-term efficacy of a computer-tailored physical activity intervention for prostate and colorectal cancer patients and survivors:A randomized controlled trial

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Journal of Sport and Health Science 2023年第6期12卷 690-704,F0003页

作者： Rianne Henrica Johanna Golsteijn Catherine Bolman Denise Astrid Peels Esmee Volders Hein de Vries Lilian lechner Department of Psychology Open University of the NetherlandsHeerlen6401 DLthe Netherlands Department of Health Promotion Maastricht UniversityMaastricht6200 MDthe Netherlands

Background Physical activity(PA)can improve the physical and psychological health of prostate and colorectal cancer survivors,but PA behavior change maintenance is necessary for long-term health *** is a print-and web-based intervention in which prostate and colorectal cancer patients and survivors receive automatically generated,personalized feedback aimed at integrating PA into daily life to increase and maintain *** evaluated the long-term outcomes of OncoActive by examining the 12-month follow-up differences between OncoActive and a control group,and we explored whether PA was maintained during a 6-month non-intervention follow-up *** Prostate or colorectal cancer patients were randomly assigned to an OncoActive(n=249)or a usual care waitlist control group(n=229).OncoActive participants received PA advice and a *** outcomes(i.e.,ActiGraph and self-report moderate-to-vigorous intensity PA(MVPA)min/week and days with≥30 min PA)and health-related outcomes(i.e.,fatigue,depression,physical functioning)were assessed at baseline,6 months,and 12 *** between groups and changes over time were assessed with multilevel linear regressions for the primary outcome(ActiGraph MVPA min/week)and all additional *** At 12 months,OncoActive participants did not perform better than control group participants at ActiGraph MVPA min/week,self-report MVPA min/week,or ActiGraph days with *** self-report days with PA were significantly higher in OncoActive compared to the control *** health-related outcomes only long-term fatigue was significantly lower in *** exploratively examining PA within OncoActive,the previously found PA effects at the end of the intervention(6 months follow-up)were maintained at 12 ***,all PA outcomes improved significantly from baseline to 12 *** control group showed small but non-significant improvements from 6 months to 12 months(and from baseline to 12 m

关键词： Behavior change maintenance Cancer survivorship Computer tailoring eHealth Physical activityTagedAPTARAEnd

Rudolf Stolzmann＇s Philosophy of Economics

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Journal of Philosophy Study 2017年第3期7卷 145-152页

作者： lechner Gerhard University of Applied Sciences

This paper deals with an economist and philosopher, who is not very well known in the literature, namely Rudolf Stolzmann. Stolzmann considered himself a representative of Neo-Kantianism and in economics he is often ascribed to the social law movement of economics. The research question in this paper deals with the late works of Stolzmann, namely, ＂Nature and Goals of the Philosophy of Economics.＂ In this work, Stolzmann made use of another methodology compared to his earlier texts in which society or a sense of community is deducted from a philosophical perspective. This paper aims to show the contradictions of this deductive method. This new approach is no longer compatible with Neo-Kantian philosophy and can be associated more closely with Hegelian or Neoplatonic philosophy; which Stolzmann appears to be unaware of. Conversely, his social organic theory gains greater plausibility and credence than before. Another result of the paper can be seen in the fact that Stolzmann did not use the deductive method consistently. Beginning from the fourth chapter, it gets confusing and Stolzmann mixed the deductive method with the inductive method.

关键词： Neo-Kantianism Neoplatonic philosophy philosophy of economics Rudolf Stolzmann Hegel Hermetic philosophy

动力密封接触表面粗糙效应的有限元分析——动态接触有限元模拟

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西北工业大学学报 2001年第2期19卷 209-211页

作者：陈国定 H Haiser W Haas G lechner 西北工业大学机械工程系陕西西安710072 斯图加特大学机械零件研究所德国斯图加特70569

利用大型有限元软件 MARC/ MENTAT32 0研究了动态接触条件下 ,表面粗糙效应对动力密封摩擦副接触性态的影响 ,揭示了动态接触条件下若干表面粗糙形貌参数对密封系统工作性能的影响。

关键词：密封粗糙度动态接触有限元法表面粗糙效应数值模拟

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密封系统性能的表面粗糙效应试验研究

机械工程学报 2000年第6期36卷 30-32页

作者：陈国定 Haiser H Haas W lechner G 西北工业大学机械系西安710072 斯图加特大学

分析了密封系统中硬对偶件表面粗糙特性对密封系统工作性能的影响，揭示了在相对运动密封零件表面间摩擦学过程中出现的微观曲路密封效应和微观跑合效应，为通过控制密封系统中硬对偶件表面加工工艺以形成优秀的表面形貌，来提高密封系... 详细信息

分析了密封系统中硬对偶件表面粗糙特性对密封系统工作性能的影响，揭示了在相对运动密封零件表面间摩擦学过程中出现的微观曲路密封效应和微观跑合效应，为通过控制密封系统中硬对偶件表面加工工艺以形成优秀的表面形貌，来提高密封系统的工作性能提供了新的思路和概念。

关键词：表面粗糙效应密封系统硬对偶件

Testing and Approval Procedures for New Slab Track Systems in Europe

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Journal of Southwest Jiaotong University(English Edition) 2010年第2期18卷 129-133页

作者：刘佳 Bernhard lechner Institute of Road Railway and Airfield ConstructionMunich University of Technology(TUM)Baumbachstr.

This paper describes the required testing and approval procedures of new track systems operated in Europe. To begin with, test methods and performance specifications according to European Standard （EN） are outlined. These include the repeated loading test, the determination of the static and dynamic stiffness of rail pads, clamping force and longitudinal rail resistance. The fact that labor tests are unable to simulate all the conditions in situ shows that these labor tests are not sufficient for the evaluation of the long term behaviour of a new track system： a test track of sufficient length must be constructed and exposed to traffic loads. In Europe to be accredited as a new system, a new slab track system must have a trial time of more than two years, during which the features of the whole system can be recognized. In the second part of this paper, the experience of the Institute of Road, Railway and Airfield Construction of TUM concerning the measuring methods of slab track systems carrying traffic are outlined. Also the approval procedure of the new slab tracks in Germany is discussed.

关键词： Testing Approval Slab track system Fastening system Europe TUM

Raman investigation of air-stable silicene nanosheetson an inert graphite surface

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Nano Research 2018年第11期11卷 5879-5889页

作者： Paola Castrucci Filippo Fabbri Tiziano Delise Manuela Scarselli Matteo Salvato Sara Paseale Roberto Francini Isabelle Berbezier Christoph lechner Fatme Jardali Holger Vach Maurizio De Crescenzi Dipartimento di Fisica Universita di Roma 'Tor Vergata' Roma 00133 Italy Center for Nanotechnology Innovation c/o NEST Istituto Italiano di Tecnologia Pisa 55127 Italy Consorzio di Ricerca Hypatia c/o Italian Space Agency Roma O0133 Italy Dipartimento di Ingegnefia Industfiale Universita di Roma "For Vergata" Roma O0133 Italy CNRS Aix-Marseille UniversitY IM2NP UMR 7334 Marseille 13397 France EDF R&D Department Matefials and Mechanics of Components (MMC) Moret-sur-Loing 77818 France CNRS-LPICM Ecole Polytechnique Universitd Paris-Saclay Palaiseau 91128 France

The fascinating properties of two dimensional (2D) crystals have gained increasing interest for many applications. The synthesis of a 2D silicon structure, namely silicene, is attracting great interest for possible development of next generation electronic devices. The main difficulty in working with silicene remains its strong tendency to oxidation when exposed to air as a consequence of its relatively highly buckled structure. In this work, we univocally identify the Raman mode of air-stable low-buckled silicene nanosheets synthesized on highly oriented pyrolytic graphite (HOPG) located at 542.5 cm-1. The main focus of this work is Raman spectroscopy and mapping analyses in combination with ab initio calculations. Scanning tunneling microscopy images reveal the presence of a patchwork of Si three-dimensional (3D) clusters and contiguous Si areas presenting a honeycomb atomic arrangement, rotated by 30 degrees with respect to the HOPG substrate underneath, with a lattice parameter of 0.41 +/- 0.02 nm and a buckling of the Si atoms of 0.05 nm. Raman analysis supports the co-existence of 3D silicon clusters and 2D silicene. The Raman shift of low-buckled silicene on an inert substrate has not been reported so far and it is completely different from the one calculated for free-standing silicene and the ones measured for silicene grown on Ag(111) surfaces. Our experimental results are perfectly reproduced by our ab initio calculations of deposited silicene nanosheets. This leads us to conclude that the precise value of the observed Raman shift crucially depends on the strain between the silicene and the HOPG substrate.

关键词： 2D materials silicene Raman spectroscopy ab initio calculations scanning tunneling microscopy scanning tunneling spectroscopy