Simplified modeling technique for damping materials on light structures: Experimental analysis and numerical tuning

Specific polymeric and asphaltic materials are widely used for NVH automotive applications. If patches of such materials are properly collocated on vehicle's panels, they are able to improve significantly noise and vibration performance by modulating damping and stiffness. This work presents a methodology for tuning a FE composite model, using optimization techniques to improve the correlation with the experimental modal tests performed. In particular, plain and ribbed aluminum plates have been considered for several covering ratios of three damping materials. The correlation between numerical and experimental data is achieved by monitoring dynamic parameters such as natural frequencies, mode shapes, and frequency response functions (FRFs). The optimization strategy consists of two steps and makes use of evolutionary and gradient-based algorithms. LMS Virtual.Lab\uae is used in this part of the work as an environment for correlation and optimization. In order to verify the reliability of the correlation, modal tests are performed on a particular vehicle's panel. Copyright \ua9 2013 by ASME

Study and Enhancement of the Archaeological Site of Sarqala (KRG, Iraq) and Its Parthian Tomb: a New Project of MiSAK, the Italian Historical-Archaeological Mission in Kurdistan of ISMEO and IICK. The Report of the 2021 Preliminary Mission.

Nel 2021 l’ISMEO e l’Istituto Internazionale di Cultura Kurda di Roma hanno deciso di avviare congiuntamente una nuova missione archeologica nel Kurdistan iracheno: la MiSAK - Missione Storico Archeologica Italiana nel Kurdistan. La MiSAK ha iniziato le sue attività nel dicembre 2021 con un progetto dedicato allo studio, salvaguardia e valorizzazione del sito archeologico di Sarqala, nell’area di Garmian. La prima campagna di questo progetto ha visto la realizzazione di una ricognizione topografica, propedeutica a tutte le future attività archeologiche, l’avvio della raccolta e studio dei materiali archeologici di superficie e la raccolta di una nuova documentazione fotografica della tomba di periodo partico scoperta nel 2013

VizieR Online Data Catalog: C3R2-KMOS zsp & galaxy physical properties (Euclid Coll., 2020)

Spectroscopic redshifts assigned during a VLT/KMOS Large Programme (88h) in three extragalactic fields (COSMOS, VVDS, SXDF) as part of the spectroscopic calibration survey for weak lensing cosmological analysis (C3R2); the catalogue also contains relevant physical information regarding the observed targets, derived either using SED fitting analysis and spectral line analysis. The released catalogue collects 424 high-quality (Q>=3) redshift measurements. The properties of a sub-sample of galaxies are given in Table 5 of the related manuscript. (1 data file)...

Euclid preparation XIII. Forecasts for galaxy morphology with the Euclid Survey using deep generative models

We present a machine learning framework to simulate realistic galaxies for the Euclid Survey, producing more complex and realistic galaxies than the analytical simulations currently used in Euclid. The proposed method combines a control on galaxy shape parameters offered by analytic models with realistic surface brightness distributions learned from real Hubble Space Telescope observations by deep generative models. We simulate a galaxy field of 0.4 deg2 as it will be seen by the Euclid visible imager VIS, and we show that galaxy structural parameters are recovered to an accuracy similar to that for pure analytic Sérsic profiles. Based on these simulations, we estimate that the Euclid Wide Survey (EWS) will be able to resolve the internal morphological structure of galaxies down to a surface brightness of 22.5 mag arcsec−2, and the Euclid Deep Survey (EDS) down to 24.9 mag arcsec−2. This corresponds to approximately 250 million galaxies at the end of the mission and a 50% complete sample for stellar masses above 1010.6 M⊙ (resp. 109.6 M⊙) at a redshift z ∼ 0.5 for the EWS (resp. EDS). The approach presented in this work can contribute to improving the preparation of future high-precision cosmological imaging surveys by allowing simulations to incorporate more realistic galaxies

MOONS: The New Multi-Object Spectrograph for the VLT

International audienceMOONS is the new Multi-Object Optical and Near-infrared Spectrograph currently under construction for the Very Large Telescope (VLT) at ESO. This remarkable instrument combines, for the first time, the collecting power of an 8-m telescope, 1000 fibres with individual robotic positioners, and both low- and high-resolution simultaneous spectral coverage across the 0.64–1.8 μm wavelength range. This facility will provide the astronomical community with a powerful, world-leading instrument able to serve a wide range of Galactic, extragalactic and cosmological studies. Construction is now proceeding full steam ahead and this overview article presents some of the science goals and the technical description of the MOONS instrument. More detailed information on the MOONS surveys is provided in the other dedicated articles in this Messenger issue