355 research outputs found
Higgs Physics at the Large Hadron Collider
A major goal of the future Large Hadron Collider will be the Higgs boson
search. In this paper the discovery In this paper the discovery potential is
described as a function of the Higgs mass showing that a Standard Model Higgs
boson can be discovered after less than two years of running of the collider.
The MSSM Higgs searches and the precision achievable on the measurement of the
Higgs boson parameters are also discussed.Comment: Talk presented at the "XXXVI Rencontres de Moriond: Electroweak
Interactions and Unified Theories", 10-17 March 200
Modelli temperamentali a confronto: il contributo del QST
In questo lavoro viene analizzata la letteratura scientifica più o meno recente sul tema del temperamento, della sua valutazione clinica e dei suoi rapporti con la patologia psichiatrica.
Viene inoltre descritto lo studio sul QST, un nuovo strumento psicometrico per la valutazione del temperamento, messo a punto presso il dipartimento di psichiatria dell'Università di Pisa
Microscopic Origin of the Valley Hall Effect in Transition Metal Dichalcogenides Revealed by Wavelength Dependent Mapping
The band structure of many semiconducting monolayer transition metal
dichalcogenides (TMDs) possesses two degenerate valleys, with equal and
opposite Berry curvature. It has been predicted that, when illuminated with
circularly polarized light, interband transitions generate an unbalanced
non-equilibrium population of electrons and holes in these valleys, resulting
in a finite Hall voltage at zero magnetic field when a current flows through
the system. This is the so-called valley Hall effect that has recently been
observed experimentally. Here, we show that this effect is mediated by
photo-generated neutral excitons and charged trions, and not by inter-band
transitions generating independent electrons and holes. We further demonstrate
an experimental strategy, based on wavelength dependent spatial mapping of the
Hall voltage, which allows the exciton and trion contributions to the valley
Hall effect to be discriminated in the measurement. These results represent a
significant step forward in our understanding of the microscopic origin of
photo-induced valley Hall effect in semiconducting transition metal
dichalcogenides, and demonstrate experimentally that composite quasi-particles,
such as trions, can also possess a finite Berry curvature.Comment: accepted for publication in Nano Letter
Absolute frequency measurement of the 1S0 - 3P0 transition of 171Yb
We report the absolute frequency measurement of the unperturbed transition
1S0 - 3P0 at 578 nm in 171Yb realized in an optical lattice frequency standard.
The absolute frequency is measured 518 295 836 590 863.55(28) Hz relative to a
cryogenic caesium fountain with a fractional uncertainty of 5.4x10-16 . This
value is in agreement with the ytterbium frequency recommended as a secondary
representation of the second in the International System of Units.Comment: This is an author-created, un-copyedited version of an article
accepted for publication/published in Metrologia. IOP Publishing Ltd is not
responsible for any errors or omissions in this version of the manuscript or
any version derived from it. The Version of Record is available online at
http://dx.doi.org/10.1088/1681-7575/aa4e62. It is published under a CC BY
licenc
Frequency transfer via a two-way optical phase comparison on a multiplexed fiber network
We performed a two-way remote optical phase comparison on optical fiber. Two
optical frequency signals were launched in opposite directions in an optical
fiber and their phases were simultaneously measured at the other end. In this
technique, the fiber noise was passively cancelled, and we compared two optical
frequencies at the ultimate 1E-21 stability level. The experiment was performed
on a 47 km fiber that is part of the metropolitan network for Internet traffic.
The technique relies on the synchronous measurement of the optical phases at
the two ends of the link, that is made possible by the use of digital
electronics. This scheme offers several advantages with respect to active noise
cancellation, and can be upgraded to perform more complex tasks
The Management of Psoriatic Arthritis in Italy: Organizational Impact Analysis of Optimized Pathways
BACKGROUND: The management of psoriatic arthritis requires competencies in the fields of both rheumatology and dermatology, and a multidisciplinary approach.AIM: To propose an effective pathway for the diagnosis, monitoring and treatment of psoriatic arthritis in the Italian context, and to assess its organizational impact on the Regional Health Service of Lombardy Region.METHODS: The analysis was performed through interviews conducted with two key opinion leaders in the areas of dermatology and rheumatology. The current pathway of patients who present symptoms that might be related to psoriatic arthritis was defined and an optimized pathway was then proposed on the basis of the clinical practice, considering the implementation of a dermatology and rheumatology shared outpatient service. The organizational impact of the optimized pathway was then assessed from both the hospital and that of the Regional Health Service of Lombardy Region perspectives.RESULTS: The implementation of the service would have a positive impact on patients' experience, improving the quality of the service provided, thanks to the multidisciplinary approach adopted, limiting the patients' resources needed for the diagnosis, reducing the number of visits and time loss. The optimized pathway, therefore, would have a limited impact on the marketing mix, while potentially improving patients satisfaction, increasing the possibility of patients' retention. To successfully implement the dermatological and rheumatologic multidisciplinary service, a precise communication strategy is mandatory.CONCLUSIONS: The optimized pathway for the diagnosis and management of psoriatic arthritis proposed would have a limited organizational impact at both hospital and Regional Health Service levels, while leading to theoretical benefits in terms of a prompt diagnosis of the pathology
Yellow laser performance of Dy in co-doped Dy,Tb:LiLuF
We present laser results obtained from a Dy-Tb co-doped
LiLuF crystal, pumped by a blue emitting InGaN laser diode, aiming for
the generation of a compact 578 nm source. We exploit the yellow Dy
transition F H to generate
yellow laser emission. The lifetime of the lower laser level is quenched via
energy transfer to co-doped Tb ions in the fluoride crystal. We report
the growth technique, spectroscopic study and room temperature continuous wave
(cw) laser results in a hemispherical cavity at 574 nm and with a highly
reflective output coupler at 578 nm. A yellow laser at 578 nm is very relevant
for metrological applications, in particular for pumping of the forbidden
SP Ytterbium clock transition, which is
recommended as a secondary representation of the second in the international
system (SI) of units. This paper was published in Optics Letters and is made
available as an electronic reprint with the permission of OSA. The paper can be
found at the following URL on the OSA website:
http://dx.doi.org/10.1364/OL.39.006628. Systematic or multiple reproduction or
distribution to multiple locations via electronic or other means is prohibited
and is subject to penalties under law.Comment: 8 pages, 5 figure
Clinical pitfalls of leishmaniasis and Whipple’s disease hidden behind systemic lupus erythematosus: A case series
Systemic lupus erythematosus (SLE) is a multisystemic autoimmune disease that can affect major organs possibly leading to life-threatening complications and appears with heterogeneous clinical picture. SLE could present with broad spectrum of clinical and laboratory features that can resemble those of other diseases, such as hemopoietic malignancies, infections, or immune-mediated disorders. Its complexity and protean features overlap with many other diseases, hindering the differential diagnosis. Rarely, true overlap with other diseases may occur. Herein, we report a case series of two patients affected by infectious diseases, namely visceral leishmaniasis and Whipple’s disease (WD), intertwined with clinical or serological features of SLE. In both cases, several confounding factors have led to a delay in the diagnosis. Moreover, we first describe the persistent elevation of autoantibodies and a monoclonal gammopathy in a patient with WD. Awareness of unusual presentations of infections or other rare disorders, which may be encountered in clinical practice when taking care of SLE patients, is essential for timely diagnosis and treatment of potentially lethal diseases
Tunneling spectroscopy of gate-induced superconductivity in MoS
The ability to gate-induce superconductivity by electrostatic charge
accumulation is a recent breakthrough in physics and nano-electronics. With the
exception of LaAlO/SrTiO interfaces, experiments on gate-induced
superconductors have been largely confined to resistance measurements, which
provide very limited information about the superconducting state. Here, we
explore gate-induced superconductivity in MoS by performing tunneling
spectroscopy to determine the energy-dependent density of states (DOS) for
different levels of electron density . In the superconducting
state, the DOS is strongly suppressed at energy smaller than the gap, \Delta,
which is maximum (\Delta ~ 2 meV) for of ~ 10 cm and
decreases monotonously for larger . A perpendicular magnetic field
generates states at that fill the gap, but a 20% DOS
suppression of superconducting origin unexpectedly persists much above the
transport critical field. Conversely, an in-plane field up to 10 T leaves the
DOS entirely unchanged. Our measurements exclude that the superconducting state
in MoS is fully gapped and reveal the presence of a DOS that vanishes
linearly with energy, the explanation of which requires going beyond a
conventional, purely phonon-driven Bardeen-Cooper-Schrieffer mechanism
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