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A concept for multiterawatt fibre lasers based on coherent pulse stacking in passive cavities

Light(Science & Applications) 2014年第1期3卷 62-68页

作者： Sven Breitkopf Tino Eidam Arno Klenke Lorenz von Grafenstein Henning Carstens Simon Holzberger Ernst Fill Thomas Schreiber ferenc krausz Andreas Tunnermann Ioachim Pupeza Jens Limpert Institute of Applied Physics Abbe Center of PhotonicsFriedrich-Schiller-Universitat Jena07745 JenaGermany Helmholtz Institute Jena 07743 JenaGermany Max Planck Institute of Quantum Optics 85748 GarchingGermany Ludwig Maximilians University Munchen Department of Physics85748 GarchingGermany Fraunhofer Institute for Applied Optics and Precision Engineering 07745 JenaGermany

Since the advent of femtosecond lasers,performance improvements have constantly impacted on existing applications and enabled novel ***,one performance feature bearing the potential of a quantum leap for high-field applications is still not available:the simultaneous emission of extremely high peak and average *** applications such as laser particle acceleration require exactly this performance regime and,therefore,challenge laser technology at *** the one hand,canonical bulk systems can provide pulse peak powers in the multi-terawatt to petawatt range,while on the other hand,advanced solid-state-laser concepts such as the thin disk,slab or fibre are well known for their high efficiency and their ability to emit high average powers in the kilowatt range with excellent beam *** this contribution,a compact laser system capable of simultaneously providing high peak and average powers with high wall-plug efficiency is proposed and *** concept is based on the temporal coherent combination(pulse stacking)of a pulse train emitted from a high-repetition-rate femtosecond laser system in a passive enhancement ***,the pulse energy is increased at the cost of the repetition rate while almost preserving the average *** concept relies on a fast switching element for dumping the enhanced pulse out of the *** switch constitutes the key challenge of our *** this challenge could,for the first time,allow the highly efficient dumping of joule-class pulses at megawatt average power levels and lead to unprecedented laser parameters.

关键词： cavity dumping cavity enhancement coherent pulse addition high average power and high peak power ultrafast lasers

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Multi-mW,few-cycle mid-infrared continuum spanning from 500 to 2250cm^(−1)

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Light(Science & Applications) 2017年第1期6卷 1-6页

作者： Jinwei Zhang Ka Fai Mak Nathalie Nagl Marcus Seidel Dominik Bauer Dirk Sutter Vladimir Pervak ferenc krausz Oleg Pronin Max-Planck-Institute of Quantum Optics Hans-Kopfermann-Str.1Garching 85748Germany Ludwig-Maximilians-University Munich Am Coulombwall 1Garching 85748Germany TRUMPF Laser GmbH Aichhalder Straße 39Schramberg D-78713Germany

The demand for and usage of broadband coherent mid-infrared sources,such as those provided by synchrotron facilities,are *** most organic molecules exhibit characteristic vibrational modes in the wavelength range between 500 and 4000 cm^(−1),such broadband coherent sources enable micro-or even nano-spectroscopic applications at or below the diffraction limit with a high signal-to-noise ratio1–*** techniques have been applied in diverse fields ranging from life sciences,material analysis,and time-resolved *** we demonstrate a broadband,coherent and intrinsically carrier-envelope-phase-stable source with a spectrum spanning from 500 to 2250 cm^(−1)(−30 dB)at an average power of 24mW and a repetition rate of 77 *** performance is enabled by the first mode-locked thin-disk oscillator operating at 2μm wavelength,providing a tenfold increase in average power over femtosecond oscillators previously demonstrated in this wavelength ***-octave spectral coverage from this compact and power-scalable system opens up a range of time-and frequency-domain spectroscopic applications.

关键词： coherent repetition oscillator

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Curve Trajectory Model for Human Preferred Path Planning of Automated Vehicles

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Automotive Innovation 2024年第1期7卷 59-70页

作者： Gergo ferenc Igneczi Erno Horvath Roland Toth Krisztian Nyilas Vehicle Research Center Szechenyi Istvan UniversityEgyetem ter 1Gyor 9026Hungary Institute for Computer Science and Control Kende str.13-17.Budapest 1111Hungary Robert Bosch Kft Gyomroi str.104-120Budapest 1103Hungary

Automated driving systems are often used for lane keeping *** these systems,a local path is planned ahead of the ***,these paths are often found unnatural by human *** response to this,this paper proposes a linear driver model,which can calculate node points reflective of human driver preferences and based on these node points a human driver preferred motion path can be designed for autonomous *** model input is the road curvature,effectively harnessed through a self-developed Euler-curve-based curve fitting algorithm.A comprehensive case study is undertaken to empirically validate the efficacy of the proposed model,demonstrating its capacity to emulate the average behavioral pat-terns observed in human curve path *** analyses further underscore the model's robustness,affirming the authenticity of the established *** paradigm shift in trajectory planning holds promising implications for the seamless integration of autonomous driving systems with human driving preferences.

关键词： Naturalistic driving Identification Driver models Path planning

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Empowering Taxpayers Through Technology-Driven Services and Education

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Belt and Road Initiative Tax Journal 2024年第1期 5-8页

作者： ferenc Vágujhelyi National Tax and Customs Administration Hungary

What tasks do technological changes taking place in the world impose on tax administrations,and at the same time,what opportunities do they create in enforcing the principle of public responsibility?How can innovations like European Digital Identity Wallet(EUDIW) be applied in the authentication environment?What assistance can the authorities provide in the integrity of taxpayers' business data?What developments are seen in the work of the Hungarian tax administration to use transaction-based data to contribute to a more modern public administration system and,last but not least,to a fair public burden?How does blockchain as a technology platform support data integrity?How does personalized and easy-to-understand communication revolutionize customer information?These questions are answered in this article.

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Modeling Expected Failure Considering Repair Time and Degradation: A Rail System Case Study

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Journal of Transportation Technologies 2024年第2期14卷 236-254页

作者： Maryam Hamidi Atefe Sedaghat Amir Gharehgozli ferenc Szidarovszky Department of Industrial and Systems Engineering Lamar University Beaumont TX USA Department of Systems and Operations Management California State University Northridge CA USA Department of Mathematics Corvinus University of Budapest F&#337v&#225mt&#233r 8 Budapest Hungary

The repeated failures of any equipment or systems are modeled as a renewal process. The management needs an assessment of the number of future failures to allocate the resources needed for fast repairs. Based on the idea of expectation by conditioning, special Volterra-type integral equations are derived for general types of repairs, considering the length of repair and reduced degradation of the idle object. In addition to minimal repair and failure replacement, partial repairs are also discussed when the repair results in reduction of the number of future failures or decreases the effective age of the object. Numerical integration-based algorithm and simulation study are performed to solve the resulting integral equation. Since the geometry degradation in different dimensions of a rail track and controlling and maintaining defects are of importance, a numerical example using the rail industry data is conducted. Expected number of failures of different failure type modes in rail track is calculated within a two-year interval. Results show that within a two-year period, anticipated occurrences of cross level failures, surface failures, and DPI failures are 2.4, 3.8, and 5.8, respectively.

关键词： Renewal Theory Expected Number of Failures Partial Repair Minimal Repair

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Restricted Summability of Fourier Transforms and Local Hardy Spaces

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Acta Mathematica Sinica,English Series 2010年第9期26卷 1627-1640页

作者： ferenc WEISZ Department of Numerical Analysis Etvs L. University

A general summability method, the so-called θ-summability is considered for multi-dimensional Fourier transforms. Under some conditions on θ, it is proved that the maximal operator of the θ-means defined in a cone is bounded from the amalgam Hardy space W（hp, e∞） to W（Lp,e∞）. This implies the almost everywhere convergence of the θ-means in a cone for all f ∈ W（L1, e∞） velong to L1.

关键词： Wiener amalgam spaces local Hardy spaces 0-summability of Fourier transforms atomic decomposition

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Thermal Reversion of Plant Phytochromes

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Molecular Plant 2020年第3期13卷 386-397页

作者： Cornelia Klose ferenc Nagy Eberhard Schafer Institute of Biology II University of Freiburg79104 FreiburgGermany Institute of Plant Biology Biological Research CentreTemesvari krt.626726 SzegedHungary

Phytochromes are red/far-red reversible photoreceptors essential for plant growth and *** signaling is mediated by the physiologically active far-red-absorbing Pfr form that can be inactivated to the red-absorbing Pr ground state by light-dependent photoconversion or by light-independent thermal reversion,also termed dark *** the term“dark reversion”is justified by historical reasons and frequently used in the literature,“thermal reversion”more appropriately describes the process of light-independent but temperature-regulated Pfr relaxation that not only occurs in darkness but also in light and is used throughout the *** reversion is a critical parameter for the light sensitivity of phytochrome-mediated responses and has been studied for decades,often resulting in contradictory *** reversion is an intrinsic property of the phytochrome molecules but can be modulated by intra-and intermolecular interactions,as well as biochemical modifications,such as *** this review,we outline the research history of phytochrome thermal reversion,highlighting important predictions that have been made before knowing the molecular *** further summarize and discuss recent findings about the molecular mechanisms regulating phytochrome thermal reversion and its functional roles in light and temperature sensing in plants.

关键词： phytochrome phyA phyB thermal reversion dark reversion in vivo spectroscopy

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Modeling Expected Failure Considering Repair Time and Degradation: A Rail System Case Study

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Journal of Transportation Technologies（交通科技期刊） 2024年第2期 236页

作者： Maryam Hamidi Atefe Sedaghat Amir Gharehgozli ferenc Szidarovszky

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Injury-associated reacquiring of intestinal stem cell function

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World Journal of Gastroenterology 2015年第7期21卷 2005-2010页

作者： ferenc Sipos Gy?rgyi M?zes 2~(nd) Department of Internal Medicine Semmelweis University

Epithelial layer of the intestine relies upon stem cells for maintaining homeostasis and *** types of stem cells are currently defined in intestinal crypts:the cycling crypt base columnar cells and quiescent *** several candidate markers and regulators of rapidly cycling and quiescent stem cells have been identified so far,the exact nature of quiescent cells is still questionable since investigations mainly focused on candidate markers rather than the label-retaining population *** results,however,have streng-thened the argument for functional *** a lineage tracing strategy label-retaining cells(LRCs)of the intestinal epithelium were marked,then followed by a pulse-chase analysis it was found that during homeostasis,LRCs were Lgr5-positive and were destined to become Paneth and neuroendocrine ***,it was demonstrated that LRCs are capable of clonogenic growth by recall to the self-renewing pool of stem cells in case of epithelial *** new findings highlight on the hierarchical and spatial organization of intestinal epithelial homeostasis and the important plasticity of progenitors during tissue regeneration,moreover,provide a motivation for studying their role in disorders like colorectal cancer.

关键词： Epithelium Injury Label-retaining cells Stem cell

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Issues and opportunities of stem cell therapy in autoimmune diseases

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World Journal of Stem Cells 2019年第4期11卷 212-221页

作者： Gy?rgyi M?zes ferenc Sipos Immunology Team 2nd Department of Internal MedicineSemmelweis University

The purpose of regenerative medicine is to restore or enhance the normal function of human cells, tissues, and organs. From a clinical point of view, the use of stem cells is more advantageous than differentiated cells because they can be collected more easily and in larger quantities, their proliferation capacity is more pronounced, they are more resistant in cell culture, their aging is delayed, they are able to form a number of cell lines, and they are able to promote vascularization of tissue carriers. The therapeutic use of stem cells for disease modification, immunomodulation, or regenerative purposes are undoubtedly encouraging, but most studies are still in their early stages, and the clinical results reported are not clear with regard to therapeutic efficacy and potential side effects. Uniform regulation of the clinical application of stem cells is also indispensable for this highly customizable, minimally invasive, individualized therapeutic method to become a successful and safe treatment alternative in many different autoimmune and autoinflammatory disorders.

关键词： Stem cell therapy Autoimmune Autoinflammatory Immunomodulation Disease modification

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