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Providing priors to Bayesian array optimization for the Sardinian candidate site of the Einstein Telescope
No full textGravity fluctuations produced by ambient seismic fields will limit the sensitivity of the next-generation, gravitational-wave detector Einstein Telescope at frequencies below 20 Hz. In addition to hosting the detector underground, mitigation will be required by monitoring the seismic field, using the data to estimate the associated gravity fluctuations, and subtracting the estimate from the detector data. In this paper, I present the plan for a Bayesian seismic-array design. I am focusing on a calculation of correlations between the surface displacement of a seismic field and the associated gravitational fluctuations using the spectral-element SPECFEM3D Cartesian software. These simulated seismic correlations will be implemented as priors in a Gaussian Process Regression and combined with observed
seismic correlations for Bayesian inference of correlations everywhere in the medium
Satellite observations and modelling of hydrogen cyanide in the Earth’s atmosphere
No full textHydrogen cyanide (HCN) is one of the most abundant cyanides
present in the global atmosphere, and is a tracer of biomass burning, especially for peatland wildfires. In this work we present observations of HCN during the 2015 Indonesian peatland fires from the IASI (Infrared Atmospheric Sounding Interferometer) satellite instrument. We also investigate HCN variability using an updated version of the TOMCAT three-dimensional (3-D) chemical transport model (CTM),
which is evaluated using HCN profiles measured by the Atmospheric Chemistry Experiment Fourier Transform Spectrometer (ACE-FTS) and FTIR ground-based instruments in the NDACC (Network for the Detection of Atmospheric Composition Change) network. Here, we compare model simulations with the IASI measurements over Indonesia
Real-time signal processing of high-precision borehole strainmeters at Mt. Etna for volcanic surveillance and eruptive events detection
No full textBorehole strainmeter observations at Etna volcano have revealed strain variations associated with volcano activity. In order to automatically identify volcano-related strain changes and track the eruptive activity, we designed the
program STRALERT to provide an efficiently filtered strain signal and perform the event detection. By running in near real time, STRALERT contributes to volcanic surveillance operations
The BLEMAB European project: Muon radiography as an imaging tool in the industrial field
No full textThe European project called BLEMAB (BLast furnace stack density Estimation through on-line Muons ABsorption measurements), provides for the application of the muon radiography technique in the industrial environment. The
project represents a non-invasive way of monitoring a blast furnace and in particular aims to study the geometric and density development of the so-called “cohesive zone”, which is important for the performance of the blast furnace itself. The installation of the detectors is expected in 2022 at the ArcelorMittal site in Bremen (Germany). This paper describes the status of the project, the experimental setup and the first results obtained with preliminary simulations
Self-referenced optical frequency comb based on low-noise Yb:CALGO femtosecond laser system
No full textWe report on the design, realization and characterization of a
compact optical-frequency-comb operating in the wavelength range from 670 to 1500 nm, based on a diode-pumped low-noise Yb:CALGO amplified ultrafast laser system. Both the carrier envelope offset and repetition rate frequencies are phaselocked to reference synthesizers providing a long-term fractional frequency stability of 7 × 10−13 at 100 s integration time
SVELAMI-B project: Remote physics laboratories at Milan-Bicocca University
No full textThe SVELAMI-B project offered in-depth activities in STEM fields to primary school children, inspired by the discoveries of famous women scientists. Starting from a shared multidisciplinary design (from physics to mathematics, computer science, geology and education science) the aim was to enhance the learning potential of scientific subjects, while addressing the problem of gender gap in Science. Due to the pandemic situation, all the activities were carried out entirely in distance learning. In this paper, some results and outcomes will be analyzed, as well as possible developments for the design of new school interventions based on a community of practice
High and low energy nucleon productions in intermediate heavy ion collisions, using AMD with Fermi boost and 3-body collision terms
No full textThe effect of a Fermi boost and 3 nucleon (3N) collision terms are studied in the framework of the anti-symmetrized molecular dynamics (AMD) of Ono et al. in two extreme cases of intermediate heavy ion collisions, one for the production of high energy nucleons and the other for the hydrogen target with heavier projectiles. The Fermi boost is added in the binary collision process as a fluctuation in the momentum space for colliding two nucleons. The 3N collision term is incorporated using a diagram of three consecutive binary collisions. The model is applied to the available experimental data and the high energy nucleon yields are well reproduced at the incident energy range of 44 A MeV to 400 A MeV. The Fermi boost is effective for the high energy proton production at the incident energy below 50 A MeV. While above 50 A MeV, the 3N collision term becomes dominant. The model is also applied for the proton emission from 12C + 1H at 95 A MeV. The experimental data are also well reproduced by these models
The Cosmic Ray Tagger of the Short Baseline Neutrino program Far Detector at Fermilab
No full textThe Short Baseline Neutrino Program at Fermilab aims to discover, or definitely rule out, the existence of sterile neutrinos at the eV mass scale by means of Liquid Argon TPCs along the Booster Neutrino Beamline. In order to mitigate the background induced by cosmic muons, the Far Detector (ICARUST600) is instrumented with a 4π Cosmic Ray Tagger system. This paper focuses on the description of the cosmic ray tagger, its performance, its integration in the
experiment and its role in the event reconstruction
Il contributo dell’archeologia digitale allo studio e all’interpretazione dell’edilizia storica. Il caso di San Marino
Get PDFThe archaeology of standing buildings and archaeological survey are the essential prerequisite to properly investigate and interpret the evolution of historical buildings. Technological advances in recent years have led to an improvement in the methodologies and tools for three-dimensional survey and data analysis. However, so far, many of these tools and methods are not fully integrated in the archaeological practice, and their potential is only partially exploited. In some cases, technology becomes the goal and not the tool to answer research questions. Often, its implementation is only limited to documentation, while the analytical contribution is ignored. The article illustrates a method already well established in the research activities of the DHiLab laboratory of the CNR ISPC, which makes use of three-dimensional survey and visualization techniques as support tools for the analysis and interpretation of the medieval fortification of San Marino, including the three Towers and the city walls. The aim is to solve interpretative issues and answer complex research questions in order to better document and analyse the urban context and to reconstruct its architectural evolution in the late medieval and post-medieval periods