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Work and heat for two-level systems in dissipative environments: Strong driving and non-Markovian dynamics (2015)

R. Schmidt, M. F. Carusela, J. P. Pekola, S. Suomela, and J. Ankerhold

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-06-18

Description: Author(s): R. Schmidt, M. F. Carusela, J. P. Pekola, S. Suomela, and J. Ankerhold Work, moments of work, and heat flux are studied for the generic case of a strongly driven two-level system immersed in a bosonic heat bath in domains of parameter space where perturbative treatments fail. This includes in particular the interplay between non-Markovian dynamics and moderate to stron... [Phys. Rev. B 91, 224303] Published Mon Jun 15, 2015

Keywords: Dynamics, dynamical systems, lattice effects

Print ISSN: 1098-0121

Electronic ISSN: 1095-3795

Topics: Physics

Published by American Physical Society (APS)

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Band-gap narrowing in Mn-doped GaAs probed by room-temperature photoluminescence (2015)

S. Prucnal, K. Gao, I. Skorupa, L. Rebohle, L. Vines, H. Schmidt, M. Khalid, Y. Wang, E. Weschke, W. Skorupa, J. Grenzer, R. Hübner, M. Helm, and S. Zhou

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-12-05

Description: Author(s): S. Prucnal, K. Gao, I. Skorupa, L. Rebohle, L. Vines, H. Schmidt, M. Khalid, Y. Wang, E. Weschke, W. Skorupa, J. Grenzer, R. Hübner, M. Helm, and S. Zhou The electronic band structure of the (Ga,Mn)As system has been one of the most intriguing problems in solid state physics over the past two decades. Determination of the band structure evolution with increasing Mn concentration is a key issue to understand the origin of ferromagnetism. Here, we pres… [Phys. Rev. B 92, 224407] Published Fri Dec 04, 2015

Keywords: Magnetism

Print ISSN: 1098-0121

Electronic ISSN: 1095-3795

Topics: Physics

Published by American Physical Society (APS)

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GaN m-plane: Atomic structure, surface bands, and optical response (2015)

M. Landmann, E. Rauls, W. G. Schmidt, M. D. Neumann, E. Speiser, and N. Esser

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-01-08

Description: Author(s): M. Landmann, E. Rauls, W. G. Schmidt, M. D. Neumann, E. Speiser, and N. Esser Density-functional-theory calculations are combined with many-body perturbation theory in order to elucidate the geometry, electronic, and optical properties of the wz-GaN(11̅ 00) surface, i.e., the so-called m-plane. The optical absorption and reflection anisotropy related to electronic tran... [Phys. Rev. B 91, 035302] Published Wed Jan 07, 2015

Keywords: Semiconductors II: surfaces, interfaces, microstructures, and related topics

Print ISSN: 1098-0121

Electronic ISSN: 1095-3795

Topics: Physics

Published by American Physical Society (APS)

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Spin-orbiton and quantum criticality inFeSc2S4 (2015)

Mittelstädt, L. ; Schmidt, M. ; Wang, Zhe ; [et al.]

American Physical Society

In: Physical Review B. 2015; 91(12): 125112. Published 2015 Mar 05. doi: 10.1103/physrevb.91.125112.

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Publication Date: 2015-03-05

Print ISSN: 1098-0121

Electronic ISSN: 1550-235X

Topics: Physics

Published by American Physical Society

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AnisotropicRu3+ 4d5magnetism in theα−RuCl3honeycomb system: Susceptibility, specific heat, and zero-field NMR (2015)

Majumder, M. ; Schmidt, M. ; Rosner, H. ; [et al.]

American Physical Society

In: Physical Review B. 2015; 91(18): 180401. Published 2015 May 07. doi: 10.1103/physrevb.91.180401.

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Publication Date: 2015-05-07

Print ISSN: 1098-0121

Electronic ISSN: 1550-235X

Topics: Physics

Published by American Physical Society

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Spinon confinement in the one-dimensional Ising-like antiferromagnetSrCo2V2O8 (2015)

Wang, Zhe ; Schmidt, M. ; Bera, A. K. ; [et al.]

American Physical Society

In: Physical Review B. 2015; 91(14): 140404. Published 2015 Apr 09. doi: 10.1103/physrevb.91.140404.

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Publication Date: 2015-04-09

Print ISSN: 1098-0121

Electronic ISSN: 1550-235X

Topics: Physics

Published by American Physical Society

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A gas chromatograph system for semi-continuous greenhouse gas measurements at Puy de Dôme station, Central France (2015)

Lopez, M. ; Schmidt, M. ; Ramonet, M. ; [et al.]

Copernicus

In: Atmospheric Measurement Techniques Discussions. 2015; 8(3): 3121-3170. Published 2015 Mar 20. doi: 10.5194/amtd-8-3121-2015.

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Publication Date: 2015-03-20

Description: Three years of greenhouse gases measurements, obtained using a gas chromatograph (GC) system located at the Puy de Dôme station at 1465 m a.s.l. in Central France are presented. The GC system was installed in 2010 at Puy de Dôme and was designed for automatic and accurate semi-continuous measurements of atmospheric carbon dioxide, methane, nitrous oxide and sulfur hexafluoride mole fractions. We present in detail the instrumental set up and the calibration strategy, which together allow the GC to reach repeatabilities of 0.1 μmol mol−1, 1.2, 0.3 nmol mol−1 and 0.06 pmol mol−1 for CO2, CH4, N2O and SF6, respectively. Comparisons of the atmospheric time series with those obtained using other instruments shown that the GC system meets the World Meteorological Organization recommendations. The analysis of the three-year atmospheric time series revealed how the planetary boundary layer height drives the mole fractions observed at a mountain site such as Puy de Dôme where air masses alternate between the planetary boundary layer and the free troposphere. Accurate long-lived greenhouse gases measurements collocated with 222Rn measurements as an atmospheric tracer, allowed us to determine the CO2, CH4 and N2O emissions in the catchment area of the station. The derived CO2 surface flux revealed a clear seasonal cycle with net uptake by plant assimilation in the spring and net emission caused by the biosphere and burning of fossil fuel during the remainder of the year. We calculated a mean annual CO2 flux of 1150 t(CO2) km−2. The derived CH4 and N2O emissions in the station catchment area were 5.6 t(CH4) km−2 yr−1 and 1.5 t(N2O) km−2 yr−1, respectively. Our derived annual CH4 flux is in agreement with the national French inventory, whereas our derived N2O flux is five times larger than the same inventory.

Electronic ISSN: 1867-8610

Topics: Geosciences

Published by Copernicus on behalf of European Geosciences Union.

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Methane emission estimates using chamber and tracer release experiments for a municipal waste water treatment plant (2015)

Yver-Kwok, C. E. ; Müller, D. ; Caldow, C. ; [et al.]

Copernicus

In: Atmospheric Measurement Techniques Discussions. 2015; 8(3): 2957-2999. Published 2015 Mar 19. doi: 10.5194/amtd-8-2957-2015.

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Publication Date: 2015-03-19

Description: This study presents two methods for estimating methane emissions from a waste water treatment plant (WWTP) along with results from a measurement campaign at a WWTP in Valence, France. These methods, chamber measurements and tracer release, rely on Fourier Transform Infrared (FTIR) spectroscopy and Cavity Ring Down Spectroscopy (CRDS) instruments. We show that the tracer release method is suitable to quantify facility- and some process-scale emissions, while the chamber measurements, provide insight into individual process emissions. Uncertainties for the two methods are described and discussed. Applying the methods to CH4 emissions of the WWTP, we confirm that the open basins are not a major source of CH4 on the WWTP (about 10% of the total emissions), but that the pretreatment and sludge treatment are the main emitters. Overall, the waste water treatment plant represents a small part (about 1.5%) of the methane emissions of the city of Valence and its surroundings, which is lower than the national inventories.

Electronic ISSN: 1867-8610

Topics: Geosciences

Published by Copernicus on behalf of European Geosciences Union.

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Virulence from vesicles: Novel mechanisms of host cell injury by Escherichia coli O104:H4 outbreak strain (2015)

Kunsmann, Lisa ; Rüter, Christian ; Bauwens, Andreas ; [et al.]

Springer Nature

In: Scientific Reports. 2015; 5(1): 13252. Published 2015 Aug 18. doi: 10.1038/srep13252.

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Publication Date: 2015-08-18

Electronic ISSN: 2045-2322

Topics: Natural Sciences in General

Published by Springer Nature

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Comparison of nitrous oxide (N2O) analyzers for high-precision measurements of atmospheric mole fractions (2015)

Lebegue, B. ; Schmidt, M. ; Ramonet, M. ; [et al.]

Copernicus

In: Atmospheric Measurement Techniques Discussions. 2015; 8(10): 10937-10982. Published 2015 Oct 26. doi: 10.5194/amtd-8-10937-2015.

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Publication Date: 2015-10-26

Description: Over the last few decades, in-situ measurements of atmospheric N2O mole fractions have been performed using gas chromatographs (GCs) equipped with electron capture detectors (ECDs). When trying to meet the World Meteorological Organization's (WMO) quality goal, this technique becomes very challenging as the detectors are highly non-linear and the GCs at remote stations require a considerable amount of maintenance by qualified technicians to maintain good short-term and long-term repeatability. With more robust optical spectrometers being now available for N2O measurements, we aim to identify a robust and stable analyzer that can be integrated into atmospheric monitoring networks, such as the Integrated Carbon Observation System (ICOS). In this study, we tested seven analyzers that were developed and commercialized from five different companies and compared the results with established techniques. Each instrument was characterized during a time period of approximately eight weeks. The test protocols included the characterization of the short-term and long-term repeatability, drift, temperature dependence, linearity and sensitivity to water vapor. During the test period, ambient air measurements were compared under field conditions at the Gif-sur-Yvette station. All of the analyzers showed a standard deviation better than 0.1 ppb for the 10 min averages. Some analyzers would benefit from improvements in temperature stability to reduce the instrument drift, which could then help in reducing the frequency of calibrations. For most instruments, the water vapor correction algorithms applied by companies are not sufficient for high-precision atmospheric measurements, which results in the need to dry the ambient air prior to analysis.

Electronic ISSN: 1867-8610

Topics: Geosciences

Published by Copernicus on behalf of European Geosciences Union.

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