4,856 research outputs found
A WZW model based on a non-semi-simple group
We present a conformal field theory which desribes a homogeneous four
dimensional Lorentz-signature space-time. The model is an ungauged WZW model
based on a central extension of the Poincar\'e algebra. The central charge of
this theory is exactly four, just like four dimensional Minkowski space. The
model can be interpreted as a four dimensional monochromatic plane wave. As
there are three commuting isometries, other interesting geometries are expected
to emerge via duality.Comment: 8 pages, phyzzx, IASSNS-HEP-93/61 Texable versio
Measurements of critical current diffraction patterns in annular Josephson junctions
We report systematic measurements of the critical current versus magnetic
field patterns of annular Josephson junctions in a wide magnetic field range. A
modulation of the envelope of the pattern, which depends on the junction width,
is observed. The data are compared with theory and good agreement is found.Comment: 4 pages, 5 figure
Metodologia semiautomatica di estrazione del drenaggio da DTM applicata allo studio della deformazione indotta da tettonica attiva
The statistical analysis of stream orientations is an helpful tool in the active tectonic studies because
the rivers network is an important geomorphologic feature useful to derive the deformation due to
active faults. The drainage network automatically derived from DTM’s is not generally usable for
this type of analysis because the automatic routines generate the stream network following the four
direction orthogonal to the cell. In this paper we present a semiautomatic methodology to extract the
drainage network from high resolution DTM data (5x5 pixel m) the most possible consistent with
the real water-drainage pattern, in order to make accurate statistic azimuthal analyses of stream
orientations. The methodology have been tested on the active tectonic area of the Tammaro basin
(Campania and Molise Regions), epicentral zone of the 1688 strong earthquake (MW=6.7). The
results obtained by the application of the proposed methodology show a good agreement with the
drainage pattern map derived from photo-interpretation (Regional Technical Cartography)
Effectiveness of hyaluronate-based pessaries in the treatment of vulvovaginal atrophy in postmenopausal women.
Objectives: This study aimed to assess the efficacy and safety of hyaluronic acid-based vaginal pessaries (Hydeal-D) in the treatment of vulvovaginal atrophy (VVA).Study design: The study was a pro..
Progress in Developing Hybrid RPCs: GEM-like Detectors with Resistive Electrodes
We have recently developed an innovative detector of photons and charged
particles: a GEM-like gaseous amplification structure with resistive electrodes
instead of commonly used metallic ones. This novel detector combines the best
property of GEMs- the capability to operate in a cascaded mode and in poorly
quenched gases - and of RPC: the protection against sparks. In this paper will
shortly review our latest achievements in this direction, however the main
focus will be given on a new advanced design that allows to build large area
detectors manufactured by a screen printing technology. The proposed detector,
depending on the applications, can operate either in a GEM mode (electron
multiplications through holes only) or as a hybrid RPC with simultaneous
amplifications in the drift region and in the holes. The possible applications
of this new detector will be discussed
Vulvovaginal atrophy (VVA) in breast cancer survivors (BCS) is still an unmet medical need: results of an Italian Delphi Panel
Abstract: Purpose: VVA is a common disease, with approximately 50% of all postmenopausal women having related symptoms. VVA has a significant impact on the personal and sexual lives and on many aspects of women\u2019s self-esteem and emotional well-being. It is particularly frequent and severe in patients treated for BC, where it originates significant economic and social costs. Given the lack of published evidence on this subject, a Delphi Panel was carried out to evaluate:The epidemiology of VVA and of its risk-factors/comorbidities in ItalyThe present standard of care and unmet medical needsThe comparison between recent US epidemiological data and the Italian situationThe health resources used in VVA BC The burden of illnessDespite the considerable negative impact on quality of life, a disparity between the high prevalence of this condition and the infrequent clinical diagnosis is documented in medical practice and in surveys. This inaccuracy is thought to be primarily a consequence of patients\u2019 unwillingness and/or reluctance to report symptoms in the clinical setting and of health-care professional\u2019s difficulty in approaching this sensitive topic during routine consultations. Methods: A Delphi Panel methodology was used: a first round of written questionnaires, followed by a plenary meeting with a facilitator and by two additional rounds of telephone interviews. Results: The prevalence of the condition in Italy can be estimated in 115,000 cases out of 380,000 BC survivors. The Panel confirmed that the epidemiological findings of a recent pharmacoeconomic analysis of a US claims database can be applied to Italian patient population. The Panel confirmed also an estimate of 4.25 additional cases/100/yr of UTI (urinary tract infection) in VVA BC patients (vs. a non-VVA-matched population), of 3.68 additional cases of vulvovaginitis, of 6.97 cases of climacteric symptoms, and of 3.64 cases of bone and joint disorders. As far as the resource use is concerned, in the VVA BC populations, 33.4 additional gynecological visits/100/year can be expected, along with 22.8 additional cancer screenings, 7.07 additional outpatient visits and 5.04 screenings for HPV. Conclusions: Even in Italy, a diagnosis of VVA, especially in a BC population, is associated with a relevant increase in the burden of illness and social costs, compared to a control population matched for age without VVA. This is due essentially to an increase in comorbidities and resource utilization with the consequence that an adequate treatment could reduce the impact of the condition
Una metodologia sistemica per la valutazione della vulnerabilitĂ sismica dei Comuni della Provincia di Benevento
The aim of this work is to produce a prototype of an Integrated Geographic Informative System
designed to characterize the seismic vulnerability of the municipalities of the Benevento province.
The developed GIS model algorithm is based on a systemic methodology which accounts for
interactions among the several factors involved into the system. The implemented algorithm allows
to estimate a vulnerability index, which in turn led to the creation of vulnerability maps. This
System, which could be enriched with new thematic data will provides the basis for future
researches in the field and make available to local decision-makers, agencies and community
planners basic information to be used in managing the seismic risk
New designs of resistive microstrip gaseous detectors (R-MSGCs)
A new family of spark-protected micropattern gaseous detectors is introduced:
a 2-D sensitive restive microstrip counter and hybrid detectors, which combine
in one design a resistive GEM with a microstrip detector. These novel detectors
have several important advantages over other conventional micropattern
detectors and are unique for applications like the readout detectors for dual
phase noble liquid TPCs and RICHs
Graded contractions of bilinear invariant forms of Lie algebras
We introduce a new construction of bilinear invariant forms on Lie algebras,
based on the method of graded contractions. The general method is described and
the -, -, and -contractions are
found. The results can be applied to all Lie algebras and superalgebras (finite
or infinite dimensional) which admit the chosen gradings. We consider some
examples: contractions of the Killing form, toroidal contractions of ,
and we briefly discuss the limit to new WZW actions.Comment: 15 page
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