715 research outputs found
High tide, low price? Flooding alerts and hotel prices in Venice
This research explores the effects of High Tide alerts on hotel prices in Venice, a city that is vulnerable to the impacts of extreme climate events due to its fragile ecosystem and a long history of floods in the city center. By analyzing and combining price data from Booking.com with publicly available information on tides and weather, this study uses regression discontinuity design to test for changes in hotel prices when tide levels reach a critical threshold. The results offer insights into the sensitivity of hotel prices to weather alerts and provide valuable information on the potential impact of climate change on Venice’s tourism-driven economy, with implications for the cost–benefit analysis of activating protective barriers for lagoon protection
Implications of parasitic absorption of electron cyclotron waves on ITER operation around half-field
A 3D Conditional Diffusion Model for Image Quality Transfer -- An Application to Low-Field MRI
Low-field (LF) MRI scanners (<1T) are still prevalent in settings with
limited resources or unreliable power supply. However, they often yield images
with lower spatial resolution and contrast than high-field (HF) scanners. This
quality disparity can result in inaccurate clinician interpretations. Image
Quality Transfer (IQT) has been developed to enhance the quality of images by
learning a mapping function between low and high-quality images. Existing IQT
models often fail to restore high-frequency features, leading to blurry output.
In this paper, we propose a 3D conditional diffusion model to improve 3D
volumetric data, specifically LF MR images. Additionally, we incorporate a
cross-batch mechanism into the self-attention and padding of our network,
ensuring broader contextual awareness even under small 3D patches. Experiments
on the publicly available Human Connectome Project (HCP) dataset for IQT and
brain parcellation demonstrate that our model outperforms existing methods both
quantitatively and qualitatively. The code is publicly available at
\url{https://github.com/edshkim98/DiffusionIQT}
Planck LFI flight model feed horns
this paper is part of the Prelaunch status LFI papers published on JINST:
http://www.iop.org/EJ/journal/-page=extra.proc5/jinst The Low Frequency
Instrument is optically interfaced with the ESA Planck telescope through 11
corrugated feed horns each connected to the Radiometer Chain Assembly (RCA).
This paper describes the design, the manufacturing and the testing of the
flight model feed horns. They have been designed to optimize the LFI optical
interfaces taking into account the tight mechanical requirements imposed by the
Planck focal plane layout. All the eleven units have been successfully tested
and integrated with the Ortho Mode transducers.Comment: This is an author-created, un-copyedited version of an article
accepted for publication in JINST. IOP Publishing Ltd is not responsible for
any errors or omissions in this version of the manuscript or any version
derived from it. The definitive publisher authenticated version is available
online at 10.1088/1748-0221/4/12/T1200
Unanticipated Pseudocoarctation Highlights the Importance of Visualizing Aortic Arch Anatomy Before Transfemoral Transcatheter Aortic Valve Implantation
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The Planck-LFI flight model composite waveguides
The Low Frequency Instrument on board the PLANCK satellite is designed to
give the most accurate map ever of the CMB anisotropy of the whole sky over a
broad frequency band spanning 27 to 77 GHz. It is made of an array of 22
pseudo-correlation radiometers, composed of 11 actively cooled (20 K) Front End
Modules (FEMs), and 11 Back End Modules (BEMs) at 300K. The connection between
the two parts is made with rectangular Wave Guides. Considerations of different
nature (thermal, electromagnetic and mechanical), imposed stringent
requirements on the WGs characteristics and drove their design. From the
thermal point of view, the WG should guarantee good insulation between the FEM
and the BEM sections to avoid overloading the cryocooler. On the other hand it
is essential that the signals do not undergo excessive attenuation through the
WG. Finally, given the different positions of the FEM modules behind the focal
surface and the mechanical constraints given by the surrounding structures,
different mechanical designs were necessary. A composite configuration of
Stainless Steel and Copper was selected to satisfy all the requirements. Given
the complex shape and the considerable length (about 1.5-2 m), manufacturing
and testing the WGs was a challenge. This work deals with the development of
the LFI WGs, including the choice of the final configuration and of the
fabrication process. It also describes the testing procedure adopted to fully
characterize these components from the electromagnetic point of view and the
space qualification process they underwent. Results obtained during the test
campaign are reported and compared with the stringent requirements. The
performance of the LFI WGs is in line with requirements, and the WGs were
successfully space qualified.Comment: this paper is part of the Prelaunch status LFI papers published on
JINST: http://www.iop.org/EJ/journal/-page=extra.proc5/jins
TCT-771 Comparison of post TAVR paravalvular regurgitation between Edwards SAPIEN 3 and Edwards SAPIEN XT; early, single center experience
Predict–first scenario modelling in support of the design of the Divertor Tokamak Test facility
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