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399 results on '"Klier J"'

1. Design of a Helium Passivation System for the Target Vessel of the Beam Dump Facility at CERN

Author

Avigni, P., Battistin, M., Calviani, M., Dalakov, P., Kershaw, K., Klier, J., Lamont, M., Sola, E. Lopez, and Ruiz, J. M. Martin

Subjects
Physics - Instrumentation and Detectors
Abstract

The Beam Dump Facility (BDF) is a proposed general-purpose facility at CERN, dedicated to fixed target and beam dump experiments, currently being developed in the context of the Physics Beyond Colliders program. The design of the facility will allow to host different types of experiments, of which SHiP is planned to be the initial one. The core of the facility is a high-density target/dump absorbing the full intensity of the SPS beam and generating a cascade of particles that are detected downstream the target complex. The target and its shielding blocks are positioned inside a vessel, which is planned to be passivized with helium, in order to reduce the activation of the gas surrounding the target and to extend the operational life of materials and equipment. The passivation system that will be in charge of purifying and circulating the helium is a critical component for the operation of the facility. Fluid dynamics simulations have been performed to study the circulation of the helium through the vessel. A detailed design of the helium passivation system and its main components has been developed.

Published
2019
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2. Transparency enhancement in a double-barrier structure by the Fano antiresonance

Author

Klier, J., Krainov, I. V., Dmitriev, A. P., and Gornyi, I. V.

Subjects
Condensed Matter - Mesoscale and Nanoscale Physics
Abstract

We show that the presence of a side-attached state strongly modifies the transmission through a one-dimensional double-barrier system in the window of wavevectors around the Fano antiresonance. Specifically, the interplay between the Fano interference and the size quantization inside the structure gives rise to narrow resonant peaks in the transmission coefficient. The height of the peaks may become close to unity (perfect transmission) even for an asymmetric setup with strong barriers, where the transmission coefficient in the absence of the Fano state is strongly suppressed at all other wavevectors. Thus, the two types of the interference phenomena, each by itself leading to the suppression of the transmission, conspire in a peculiar way to produce the transparency enhancement.

Published
2019
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3. From weak to strong disorder in Weyl semimetals: Self-consistent Born approximation

Author

Klier, J., Gornyi, I. V., and Mirlin, A. D.

Subjects
Condensed Matter - Disordered Systems and Neural Networks, Condensed Matter - Mesoscale and Nanoscale Physics
Abstract

We analyze theoretically the conductivity of Weyl semimetals within the self-consistent Born approximation (SCBA) in the full range of disorder strength, from weak to strong disorder. In the range of intermediate disorder, we find a critical regime which separates the semimetal and diffusion regimes. While the numerical values of the critical exponents are not expected to be exact within the SCBA, the approach allows us to calculate functional dependences of various observables (density of states, quasiparticle broadening, conductivity) in a closed form. This sheds more light on the qualitative behavior of the conductivity and its universal features in disordered Weyl semimetals. In particular, we have found that the vertex corrections in the Kubo formula are of crucial importance in the regime of strong disorder and lead to saturation of the dc conductivity with increasing disorder strength. We have also analyzed the evolution of the optical conductivity with increasing disorder strength, including its scaling properties in the critical regime.

Published
2019
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4. Transversal magnetoresistance and Shubnikov-de Haas oscillations in Weyl semimetals

Author

Klier, J., Gornyi, I. V., and Mirlin, A. D.

Subjects
Condensed Matter - Mesoscale and Nanoscale Physics, Condensed Matter - Disordered Systems and Neural Networks, Condensed Matter - Materials Science
Abstract

We explore theoretically the magnetoresistance of Weyl semimetals in transversal magnetic fields away from charge neutrality. The analysis within the self-consistent Born approximation is done for the two different models of disorder: (i) short-range impurties and (ii) charged (Coulomb) impurities. For these models of disorder, we calculate the conductivity away from charge neutrality point as well as the Hall conductivity, and analyze the transversal magnetoresistance (TMR) and Shubnikov-de Haas oscillations for both types of disorder. We further consider a model with Weyl nodes shifted in energy with respect to each other (as found in various materials) with the chemical potential corresponding to the total charge neutrality. In the experimentally most relevant case of Coulomb impurities, we find in this model a large TMR in a broad range of quantizing magnetic fields. More specifically, in the ultra-quantum limit, where only the zeroth Landau level is effective, the TMR is linear in magnetic field. In the regime of moderate (but still quantizing) magnetic fields, where the higher Landau levels are relevant, the rapidly growing TMR is supplemented by strong Shubnikov-de Haas oscillations, consistent with experimental observations.

Published
2017
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24. Transversal magnetoresistance in Weyl semimetals

Author

Klier, J., Gornyi, I. V., and Mirlin, A. D.

Subjects
Condensed Matter - Mesoscale and Nanoscale Physics
Abstract

We explore theoretically the magnetoresistvity of three-dimensional Weyl and Dirac semimetals in transversal magnetic fields within two alternative models of disorder: (i) short-range impurities and (ii) charged (Coulomb) impurities. Impurity scattering is treated using the self-consistent Born approximation. We find that an unusual broadening of Landau levels leads to a variety of regimes of the resistivity scaling in the temperature-magnetic field plane. In particular, the magnetoresitance is non-monotonous for the white-noise disorder model. For $H\to 0$ the magnetoresistance for short-range impurities vanishes in a non-analytic way as $H^{1/3}$. In the limits of strongest magnetic fields $H$, the magnetoresistivity vanishes as $1/H$ for pointlike impurities, while it is linear and positive in the model with Coulomb impurities.

Published
2015
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40. Osteoprotektion unter androgendeprivativer Therapie beim knochenmetastasierten kastrationsresistenten Prostatakarzinom (mCRPC): Ergebnisse einer Umfrage von d-uo

Author

Doehn, C, Klier, J, Johannsen, M, Eichenauer, R, Schönfelder, R, Romagnolo, A, Reese, S, Nitz, C, Jaeger, A, Fieseler, C, Burkert-Scholz, M, Brenneis, H, Binder, M, Beuke, M, Schröder, J, Hempel, E, König, F, Doehn, C, Klier, J, Johannsen, M, Eichenauer, R, Schönfelder, R, Romagnolo, A, Reese, S, Nitz, C, Jaeger, A, Fieseler, C, Burkert-Scholz, M, Brenneis, H, Binder, M, Beuke, M, Schröder, J, Hempel, E, and König, F

Published
2023

43. Osteoprotektion unter androgendeprivativer Therapie beim nichtmetastasierten Prostatakarzinom (nmHSPC): Ergebnisse einer Umfrage von d-uo

Author

Klier, J, König, F, Schönfelder, R, Eichenauer, R, Johannsen, M, Beuke, M, Binder, M, Brenneis, H, Burkert-Scholz, M, Fieseler, C, Jaeger, A, Nitz, C, Reese, S, Romagnolo, A, Schröder, J, Hempel, E, Doehn, C, Klier, J, König, F, Schönfelder, R, Eichenauer, R, Johannsen, M, Beuke, M, Binder, M, Brenneis, H, Burkert-Scholz, M, Fieseler, C, Jaeger, A, Nitz, C, Reese, S, Romagnolo, A, Schröder, J, Hempel, E, and Doehn, C

Published
2023

47. d-uo Versorgungsstudie zur Therapie mit Radium-223: Daten einer retrospektiven Befragung

Author

König, F, Eichenauer, R, Schönfelder, R, Johannsen, M, Klier, J, Schröder, J, Hempel, E, and Doehn, C

Subjects
ddc: 610, Medicine and health
Abstract

Einleitung: Im Rahmen einer Phase III-Studie (ERA-223) wurde bei Patienten unter einer Kombinationstherapie mit Radium-223 und Abirateron ein erhöhtes Fraktur- und ein möglicherweise erhöhtes Sterberisiko festgestellt. Dies hat im Jahr 2018 zu einer Änderung des Zulassungstextes [zum vollständigen Text gelangen Sie über die oben angegebene URL]

Published
2022
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48. Neudiagnose Prostatakarzinom: Daten aus der nicht-interventionellen, prospektiven VERSUS-Studie von d-uo

Author

Schönfelder, R, König, F, Eichenauer, R, Johannsen, M, Klier, J, Schröder, J, Hempel, E, and Doehn, C

Subjects
ddc: 610, Medicine and health
Abstract

Einleitung: Tumorerkrankungen aus dem urologischen Gebiet machen in Deutschland etwa 37% aller Krebserkrankungen bei Männern und etwa 5% aller Krebserkrankungen bei Frauen aus (RKI 2016). Eine Voraussetzung für die Erfassung und wissenschaftliche Auswertung der Versorgungsqualität [zum vollständigen Text gelangen Sie über die oben angegebene URL]

Published
2022
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49. Therapie des CRPC: Ergebnisse einer Umfrage von d-uo

Author

König, F, Eichenauer, R, Johannsen, M, Klier, J, Schönfelder, R, Schröder, J, Hempel, E, and Doehn, C

Subjects
ddc: 610, Medicine and health
Abstract

Einleitung: Für Patienten mit einem kastrationsresistenten Prostatakarzinom (CRPC) stehen heute diverse Therapieansätze zur Verfügung. In der vorliegenden Arbeit haben wir die aktuelle Versorgungssituation in urologischen Praxen untersucht. Methode: Es handelte sich um eine fragebogenbasierte [zum vollständigen Text gelangen Sie über die oben angegebene URL]

Published
2022
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50. Osteoprotektion unter androgendeprivativer Therapie beim nichtmetastasierten Prostatakarzinom (M0-PCa): Ergebnisse einer Umfrage von d-uo

Author

Doehn, C, Klier, J, König, F, Eichenauer, R, Johannsen, M, Schönfelder, R, Schröder, J, and Hempel, E

Subjects
ddc: 610, Medicine and health
Abstract

Einleitung: Patienten mit einem Prostatakarzinom (PCa) haben oftmals bereits eine verminderte Knochendichte. Der zusätzlich ungünstige Effekt einer androgendeprivativen Therapie (ADT) auf die Knochendichte ist bekannt. Eindeutige Leitlinienempfehlungen liegen vor. In der vorliegenden Arbeit [zum vollständigen Text gelangen Sie über die oben angegebene URL]

Published
2022
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