1,019 research outputs found
A FRAMEWORK FOR ARCHITECTURAL HERITAGE HBIM SEMANTIZATION AND DEVELOPMENT
Despite the recognized advantages of the use of BIM in the field of architecture and engineering, the extension of this procedure to the architectural heritage is neither immediate nor critical. The uniqueness and irregularity of historical architecture, on the one hand, and the great quantity of information necessary for the knowledge of architectural heritage, on the other, require appropriate reflections. The aim of this paper is to define a general framework for the use of BIM procedures for architectural heritage. The proposed methodology consists of three different Level of Development (LoD), depending on the characteristics of the building and the objectives of the study: a simplified model with a low geometric accuracy and a minimum quantity of information (LoD 200); a model nearer to the reality but, however, with a high deviation between virtual and real model (LoD 300); a detailed BIM model that reproduce as much as possible the geometric irregularities of the building and is enriched by the maximum quantity of information available (LoD 400)
LHC discovery potential for supersymmetry with \sqrt{s}=7 TeV and 5-30 fb^{-1}
We extend our earlier results delineating the supersymmetry (SUSY) reach of
the CERN Large Hadron Collider operating at a centre-of-mass energy \sqrt{s}=7
TeV to integrated luminosities in the range 5 - 30 fb^{-1}. Our results are
presented within the paradigm minimal supergravity model (mSUGRA or CMSSM).
Using a 6-dimensional grid of cuts for the optimization of signal to background
ratio -- including missing E_T-- we find for m(gluino) \sim m(squark) an LHC
5\sigma SUSY discovery reach of m(gluino) \sim 1.3,\ 1.4,\ 1.5 and 1.6 TeV for
5, 10, 20 and 30 fb^{-1}, respectively. For m(squark)>> m(gluino), the
corresponding reach is instead m(gluino)\sim 0.8,\ 0.9,\ 1.0 and 1.05 TeV, for
the same integrated luminosities.Comment: 7 pages with 2 .eps figure. In version 2, a new figure has been added
along with associated discussio
Addressing \mu-b_\mu and proton lifetime problems and active neutrino masses in a U(1)^\prime-extended supergravity model
We present a locally supersymmetric extension of the minimal supersymmetric
Standard Model (MSSM) based on the gauge group where, except for the supersymmetry breaking scale
which is fixed to be GeV, we require that all non-Standard-Model
parameters allowed by the {\it local} spacetime and gauge symmetries assume
their natural values. The symmetry, which is spontaneously broken
at the intermediate scale, serves to ({\it i}) explain the weak scale
magnitudes of and terms, ({\it ii}) ensure that dimension-3 and
dimension-4 baryon-number-violating superpotential operators are forbidden,
solving the proton-lifetime problem, ({\it iii}) predict {\it bilinear lepton
number violation} in the superpotential at just the right level to accommodate
the observed mass and mixing pattern of active neutrinos (leading to a novel
connection between the SUSY breaking scale and neutrino masses), while
corresponding trilinear operators are strongly supppressed. The phenomenology
is like that of the MSSM with bilinear R-parity violation, were the would-be
lightest supersymmetric particle decays leptonically with a lifetime of s. Theoretical consistency of our model requires the
existence of multi-TeV, stable, colour-triplet, weak-isosinglet scalars or
fermions, with either conventional or exotic electric charge which should be
readily detectable if they are within the kinematic reach of a hadron collider.
Null results of searches for heavy exotic isotopes implies that the re-heating
temperature of our Universe must have been below their mass scale which, in
turn, suggests that sphalerons play a key role for baryogensis. Finally, the
dark matter cannot be the weakly interacting neutralino.Comment: 33 pages, 2 figures, Discussion on proton decay and radiative
neutrino masses augmented, and references adde
Determining the squark mass at the LHC
We propose a new way to determine the squark mass based on the shape of
di-jet invariant mass distribution of supersymmetry (SUSY) di-jet events at the
Large Hadron Collider (LHC). Our algorithm, which is based on event kinematics,
requires that the branching ratio is
substantial for at least some types of squarks, and that
. We select di-jet events with no
isolated leptons, and impose cuts on the total jet transverse energy,
, on , and on the
azimuthal angle between the two jets to reduce SM backgrounds. The shape of the
resulting di-jet mass distribution depends sensitively on the squark mass,
especially if the integrated luminosity is sufficient to allow a hard enough
cut on and yet leave a large enough signal to obtain the
distribution. We simulate the signal and Standard Model (SM) backgrounds for
100 fb integrated luminosity at 14 TeV requiring GeV.
We show that it should be possible to extract to within about
3% at 95% CL --- similar to the precision obtained using --- from the
di-jet mass distribution if GeV, or to within % if TeV.Comment: 20 pages, 9 figures. Footnote added, updated reference
DETERMINATION OF ORGANOCHLORINE PESTICIDE RESIDUES IN THE WATER OF PADDY FIELDS OF PRAKASAM DISTRICT, ANDHRA PRADESH, INDIA
Organochlorine (OC) pesticide residues in pooled water of paddy field samples of Prakasam District have been investigated to find out the extent of pesticide contamination and accumulation. Collected Water samples were processed using a liquid-liquid extraction followed by Gas-Chromatographic technique for pesticide residue quantification with mass selective detector (GC-MS). The conditions were followed for GC, Column: HP-5MS
Deployment of solar sails by joule effect: thermal analysis and experimental results
Space vehicles may be propelled by solar sails exploiting the radiation pressure coming from the sun and applied on their surfaces. This work deals with the adoption of Nickel-Titanium Shape Memory Alloy (SMA) elements in the sail deployment mechanism activated by the Joule Effect, i.e., using the same SMA elements as a resistance within suitable designed electrical circuits. Mathematical models were analyzed for the thermal analysis by implementing algorithms for the evaluation of the temperature trend depending on the design parameters. Several solar sail prototypes were built up and tested with different number, size, and arrangement of the SMA elements, as well as the type of the selected electrical circuit. The main parameters were discussed in the tested configurations and advantages discussed as well
Experimental Tests of Conduction/Convection Heat Transfer in Very High Porosity Foams with Lattice Structures, Immersed in Different Fluids
This experimental work presents the results of measurements of thermal conductivity lambda and convection heat transfer coefficient h on regular structure PLA and aluminium foams with low density ratio (similar to 0.15), carried out with a TCP (thermal conductivity probe), built by the authors' laboratory. Measurements were performed with two fluids, water and air: pure fluids, and samples with the PLA and aluminium foams immersed in both fluids have been tested. Four temperatures (10, 20, 30, 40 degrees C) and various temperature differences during the tests Delta T (between 0.35 and 9 degrees C) were applied. Also, tests in water mixed with 0.5% of a gel (agar agar) have been run in order to increase the water viscosity and to avoid convection starting. For these tests, at the end of the heating, the temperature of the probe reaches steady-state values, when all the thermal power supplied by the probe is transferred to the cooled cell wall; thermal conductivity was also evaluated through the guarded hot ring (GHR) method. A difference was found between the results of lambda in steady-state and transient regimes, likely due to the difference of the sample volume interested by heating during the tests. Also, the effect of the temperature difference Delta T on the behaviour of the pure fluid and foams was outlined. The mutual effect of thermal conductivity and free convection heat transfer results in being extremely important to describe the behaviour of such kinds of composites when they are used to increase or to reduce the heat transfer, as heat conductors or insulators. Very few works are present in the literature about this subject, above all, ones regarding low-density regular structures
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