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Revealing excitonic processes and chemical bonding in MoS2 by x-ray spectroscopy

Physical Review B 2018年第11期98卷 115149-115149页

作者： J. C. Woicik C. Weiland A. K. Rumaiz M. Brumbach N. F. Quackenbush J. M. Ablett E. L. Shirley Materials Measurement Science Division Material Measurement Laboratory National Institute of Standards and Technology Gaithersburg Maryland 20899 USA National Synchrotron Light Source II Brookhaven National Laboratory Upton New York 11973 USA Materials Characterization Department Sandia National Laboratories Albuquerque New Mexico 87185 USA Synchrotron SOLEIL L’Orme des Merisiers Saint-Aubin BP 48 91192 Gif-sur-Yvette Cedex France Sensor Science Division Physical Measurement Laboratory National Institute of Standards and Technology Gaithersburg Maryland 20899 USA

Electron core-hole processes at absorption edges sport several signatures, primarily in the form of bound states and/or excitonic enhancement. Through analysis of the resonant-Raman Auger effect for the two-dimensional transition-metal dichalcogenide MoS2, we demonstrate that these effects have significant manifestations at the S K edge. We characterize two asymmetric excitonically enhanced edges: one at the fundamental band edge and one several electron volts above it following a second band gap that lies entirely within the unoccupied states, with the latter revealing an anomalous postcollision interaction effect. Our interpretation is supported by comparison of both the photoemission valence-band spectrum and the S K-edge x-ray-absorption spectrum with electronic structure calculations and an ab initio solution of the Bethe-Salpeter equation that accurately accounts for the electron-core-hole interaction.

关键词： Bethe-Salpeter equation Chemical bonding Electronic structure Transition metal dichalcogenides X-ray absorption spectroscopy

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Development of fiber optic sensing interrogators for launchers

Development of fiber optic sensing interrogators for launche...

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International Conference on Space Optics 2010, ICSO 2010

作者： Plattner, M.P. Buck, T.C. Eder, B. Reutlinger, A. McKenzie, I. Kayser-Threde GmbH Department of Optical Instruments and Telescopes Germany Technische Universitaet Muenchen Institute for Measurement Systems and Sensor Technology Germany European Space Agency Optoelectronics Section Netherlands

ISBN: (纸本)9781510616196

We present our work about the development of two complementary interrogation schemes based on fiber optic sensing for the use of structural and thermal monitoring of Ariane launchers. The advantages of fiber optic sensing in particular light-weight, immunity to electromagnetic interferences and the possibility of sensor distribution along optical fibers are driving factors for utilization of this technology in space crafts [1]. The edge-filter (EF) and scanning-laser (SL) interrogators for determination of the mean wavelength of fiber Bragg grating (FBG) sensors have been implemented as two separate demonstrators. Within this paper we describe the functional principles of both interrogators. Furthermore we present test results where the developed systems have been used for readout of FBG sensors which are implemented in an Ariane structural demonstrator during thermal, thermal-vacuum and vibration tests. Functionality of both systems is demonstrated and their potential for further development towards space qualified systems is shown. Since the performance characteristics of the two systems are different from each other, they are dedicated for different sensing applications on a launcher. The EF sensor interrogator provides a sample rate of 20 kHz at a number of 4 connected sensors and supports parallel readout and aliasing free operation. Therefore it is best suited for high priority measurement. Structural monitoring which requires the acquisition of real time sensor information in order to support control of the launcher is one operation area for a future EF system. The SL interrogator provides an overall measurement rate of 1 kHz at a number of 24 connected sensors distributed on three sensor channels. It can be adapted to any sensors that have design wavelengths lying within the output spectrum of the laser diode. Furthermore the number of overall sensors to be read out with this system can be adapted easily. Thermal mapping of satellite panels is one possible f

关键词： Fiber Bragg gratings

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Measuring Contact Pressures of phonating Vocal Fold using a Pressure-Sensing-Matrix during Hemi-Larynx Experiments

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Proceedings of Meetings on Acoustics 2021年第1期45卷

作者： Florian Scheible Reinhard Veltrup Casey Schaan Raphael Lamprecht Manuel Staggl Marion Semmler Alexander Sutor 1Institute of Measurement and Sensor Technology UMIT - Private University for Health Sciences Medical Informatics and Technology Hall in Tirol Tirol 6060 AUSTRIA florian.scheible@umit-tirol.at raphael.lamprecht@umit-tirol.at manuel.staggl@umit-tirol.at alexander.sutor@umit-tirol.at 2Division of Phoniatrics and Pediatric Audiology Department of Otorhinolaryngology Head- and Neck Surgery University Hospital Erlangen Friedrich-Alexander-University Erlangen-Nürnberg Bayern Erlangen-Nürnberg GERMANY reinhard.veltrup@uk-erlangen.de casey.schaan@fau.de marion.semmler@uk-erlangen.de

During phonation, the vocal folds execute a complex movement. Related to the subglottal pressure and tension of the vocal folds themselves, this movement may differ, furthermore depending on the kind of phonation a collision between both vocal folds may occur. If the vocal folds are overstrained, this can cause lesions. To gain knowledge about the vocal folds movements and the way of their collisions, a high-speed evaluation unit for a pressure-mapping sensor was developed. The sensor brings along a local resolution of 27.6 measure points per square centimeter and with the developed unit an adjustable framerate up to 1 kHz can be realized. Due to a sensor thickness of about 0.2 mm, an integration into hemi-larynx flow experiments is quite simple without vigorous changes on the setup. Because of an unrestricted field of view it is possible to record the movements with a high-speed camera. These recordings will be correlated with contact pressures in the post processing. During these experiments, different flowrates of the excitation air.

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Elastography of vocal folds

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Journal of Physics: Conference Series 2019年第1期1379卷

作者： R Lamprecht M Maghzinajafabadi M Döllinger M Semmler A Sutor Institute of Measurement and Sensor Technology UMIT - Private University for Health Sciences Medical Informatics and Technology 6060 Hall in Tirol Austria Department of Otorhinolaryngology Division of Phoniatrics and Pediatric Audiology University Hospital Erlangen Friedrich-Alexander-University Erlangen-Nürnberg 91054 Erlangen Germany

The diagnosis of changes in the structure of the vocal folds is an important clinical task. There is no approach available, which is capable of getting synchronous spatial and biomechanical properties of them. Whereas biomechanical changes, particularly the elasticity, are a good maker for malignant and benign conditions. To gain the elastic characteristics of the vocal folds we are proposing an endoscopic approach using ultrasound elastography.

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First Results Using the Planck-Balance

First Results Using the Planck-Balance

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Conference on Precision Electromagnetic measurements

作者： C. Rothleitner J. Schleichert S. Vasilyan N. Rogge L. Gunther F. Hilbrunner I. Rahneberg D. Knopf T. Frohlich F. Hartig Physikalisch-Technische Bundesanstalt (PTB) Braunschweig Germany Institute of Process Measurement and Sensor Technology Technische Universität Ilmenau Ilmenau Germany

A table top version of a Kibble balance called the Planck-Balance has been developed by the Physikalisch-Technische Bundesanstalt (PTB) and the Technische Universitat Ilmenau (TUIL). After one year of development, the first measurement results were obtained. The mass of a 10 g mass standard has been determined with a relative type A uncertainty of 3 × 10~(-7). A preliminary uncertainty budget shows a relative combined measurement uncertainty of 1 × 10~(-6). This paper gives a brief overview of the concept of the balance, its measurement principle, its results and a preliminary uncertainty budget.

关键词： Planck-Balance Kibble balance redefinition of the kilogram mass dissemination table top Kibble balance

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Dynamic sensor positioning in large measuring volumes by an inverse kinematic concept

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Journal of Physics: Conference Series 2018年第14期1065卷

作者： Ingo Ortlepp Eberhard Manske Roland Füßl Institute of Process Measurement and Sensor Technology Technische Universität Ilmenau 98693 Ilmenau Germany

The growth in measuring objects and the demand for measurement precision in the sub-nanometer range are the challenges for future nano positioning and nano measuring machines (NPMMs). However, the usual moving stage principle will reach its limits due to the larger moving masses it entails for large measuring volumes. Therefore, an inverse kinematic concept for NPMMs is proposed, which permits to reduce the moving masses to a few kilogram. In this concept, the interferometers and the probe are moved, while the measuring object and the interferometer mirrors are fixed. The probe position is measured and controlled in 6 DOF.

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Nanopositioning and nanomeasuring machine NPMM-200 - Sub-nanometre resolution and highest accuracy in extended macroscopic working areas 17

Nanopositioning and nanomeasuring machine NPMM-200 - Sub-nan...

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17th International Conference of the European Society for Precision Engineering and Nanotechnology, EUSPEN 2017

作者： Manske, E. Jäger, G. Hausotte, T. Müller, A. Balzer, F. Institute of Process Measurement and Sensor Technology Technische Universität Ilmenau Am Ehrenberg Ilmenau98684 Germany Nägelsbachstraße 25 Erlangen91052 Germany Hexagon Metrology GmbH Siegmund-Hiepe-Straße 2-12 Wetzlar35578 Germany

ISBN: (纸本)9780995775107

At the Technische Universität Ilmenau, a new Nanopositioning and Nanomeasuring Machine NPMM 200 with a measuring range of 200 mm × 200 mm × 25 mm and a resolution of 0.02 nm has been developed. In order to achieve both highest nanometre accuracy and largest three-dimensional working space, an extended three-dimensional Abbe comparator principle is applied. The object to be measured is placed on a special mirror plate whose position in all six degrees of freedom is measured by high-precision multi-axis fibre-coupled laser interferometers. By means of an advanced closed-loop control tilt errors induced by the guiding systems can be minimized up to interferometric level. This paper presents the metrological concept, the realized design, the conditioning of environmental parameters as well as some first measuring results.

关键词： Comparators (optical)

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Towards replacing resistance thermometry with photonic thermometry

arXiv

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arXiv 2017年

作者： Klimov, Nikolai Purdy, Thomas Ahmed, Zeeshan Joint Quantum Institute University of Maryland College ParkMD20742 Thermodynamic Metrology Group Sensor Science Division Physical Measurement Laboratory National Institute of Standards and Technology GaithersburgMD20899 Quantum Optics Group Quantum Measurement Division Physical Measurement Laboratory National Institute of Standards and Technology GaithersburgMD20899

Resistance thermometry provides a time-tested method for taking temperature measurements that has been painstakingly developed over the last century. However, fundamental limits to resistance-based approaches along with a desire to reduce the cost of sensor ownership and increase sensor stability has produced considerable interest in developing photonic temperature sensors. Here we demonstrate that silicon photonic crystal cavity-based thermometers can measure temperature with uncertainities of 175 mK (k = 1), where uncertainties are dominated by ageing effects originating from the hysteresis in the device packaging materials. Our results, a 4-fold improvement over recent developments, clearly demonstate the rapid progress of silicon photonic sensors in replacing legacy devices. Copyright © 2017, The Authors. All rights reserved.

关键词： Thermometers

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Scanning strategies for long term and long distance AFM measurements 16

Scanning strategies for long term and long distance AFM meas...

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16th International Conference of the European Society for Precision Engineering and Nanotechnology, EUSPEN 2016

作者： Vorbringer-Dorozhovets, Nataliya Manske, Eberhard Production and Precision Measurement Technology Group Institute for Process Measurement and Sensor Technology Department of Mechanical Engineering Technische Universität Ilmenau Germany

ISBN: (纸本)9780956679086

Long range AFM measurements are mainly affected by drift caused by relative long measurement times and by tip wear caused by large measurement distances. One way to avoid these effects is to reduce measurement times and scanning distances. Special intelligent scanning strategies were developed and investigated. These strategies are based on adaptive sampling and different trajectories. This paper gives an introduction into the implemented scanning strategies. This paper presents one example of the developed "adaptive sampling" strategy as well as first results of the circular scan.

关键词： Scanning

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Breaking the energy-symmetry blockade in magneto-optical rotation

arXiv

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arXiv 2018年

作者： Zhu, Chengjie Zhou, Feng Zhu, Eric Y. Hagley, E.W. Deng, L. MOE Key Laboratory of Advanced Micro-Structured Materials School of Physics Science and Engineering Tongji University Shanghai200092 China Engineering Physics Division National Institute of Standards & Technology GaithersburgMD20899 United States uhan Institute of Physics & Mathematics Chinese Academy of Sciences Wuhan430071 China School of Optical and Electronic Information Huazhong University of Science & Technology Wuhan430074 China Quantum Measurement Division National Institute of Standards & Technology GaithersburgMD20899 United States Department of Electrical and Computer Engineering University of Toronto TorontoONM5S 3G4 Canada Sensor Science Division National Institute of Standards & Technology GaithersburgMD20899 United States

The magneto-optical polarization rotation effect has prolific applications in various research areas spanning the scientific spectrum including space and interstellar research, nano-technology and material science, biomedical imaging, and sub-atomic particle research. In nonlinear magneto- optical rotation (NMOR), the intensity of a linearly-polarized probe field affects the rotation of its own polarization plane while propagating in a magnetized medium. However, typical NMOR signals of conventional single-beam Λ-scheme atomic magnetometers are peculiarly small, requiring sophisticated magnetic shielding under complex operational conditions. Here, we show the presence of an energy-symmetry blockade that undermines the NMOR effect in conventional single-beam Λ-scheme atomic magnetometers. We further demonstrate, both experimentally and theoretically, an inelastic wave-mixing technique that breaks this NMOR blockade, resulting in more than five orders of magnitude (>300,000-fold) NMOR optical signal power spectral density enhancement never before seen with conventional single-beam Λ-scheme atomic magnetometers. This new technique, demonstrated with substantially reduced light intensities, may lead to many applications, especially in the field of bio-magnetism and high-resolution low-field magnetic imaging. Copyright © 2018, The Authors. All rights reserved.

关键词： Medical imaging

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