2,196 research outputs found
The orbifold cohomology of moduli of genus 3 curves
In this work we study the additive orbifold cohomology of the moduli stack of
smooth genus g curves. We show that this problem reduces to investigating the
rational cohomology of moduli spaces of cyclic covers of curves where the genus
of the covering curve is g. Then we work out the case of genus g=3.
Furthermore, we determine the part of the orbifold cohomology of the
Deligne-Mumford compactification of the moduli space of genus 3 curves that
comes from the Zariski closure of the inertia stack of M_3.Comment: 29 pages, 2 figures. Minor changes, to appear in Manuscripta Mat
Joint supervised and self-supervised learning for 3D real world challenges
Point cloud processing and 3D shape understanding are challenging tasks for which deep learning techniques have demonstrated great potentials. Still further progresses are essential to allow artificial intelligent agents to interact with the real world. In many practical conditions the amount of annotated data may be limited and integrating new sources of knowledge becomes crucial to support autonomous learning. Here we consider several scenarios involving synthetic and real world point clouds where supervised learning fails due to data scarcity and large domain gaps. We propose to enrich standard feature representations by leveraging self-supervision through a multi-task model that can solve a 3D puzzle while learning the main task of shape classification or part segmentation. An extensive analysis investigating few-shot, transfer learning and cross-domain settings shows the effectiveness of our approach with state-of-the-art results
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ISO-LWS grating spectroscopy: the case of R CrA star forming region
We present the far infrared spectra of the R CrA star forming region obtained with ISO-LWS. We collected a pointed observation on the Herbig Ae star R CrA and a raster scan covering the surrounding region, where HH100 (with its exciting source) and the pre-Main Sequence star T CrA are located. The OI 63μm and the CII 158μm lines have been detected in all the pointed positions, with a ratio consistent with PDR excitation. CO rotational lines (between Jup=14 and Jup=19) are detected on R CrA; from their intensities we derived, using a LVG model, the density and temperature of the emitting region. Other molecular transitions (OH and H2O) have been detected on the investigated objects; the derived cooling of all the molecular species is in agreement with C-shock as the likely excitation mechanism. The continuum emission of R CrA peaks around 100μm (as expected for a Herbig star) while the other sources (T CrA, HH100) show increasing continua up to ~200μm, indicating that they are probably less evolved sources
Integrated biorefinery strategy for poly(3-hydroxybutyrate) accumulation in Cupriavidus necator DSM 545 using a sugar rich syrup from cereal waste and acetate from gas fermentation
Poly(3-hydroxybutyrate) (PHB) is one of the most well-known biodegradable and biocompatible biopolymers
produced by prokaryotic microorganisms. It belongs to the family of polyhydroxyalkanoates (PHAs), and it has
gained significant attention in recent years due to its potential as a sustainable alternative to traditional
petroleum-based plastics. Cupriavidus necator has been identified as a potential producer of PHB for industrial
applications due to its ability to produce high amounts of the polymer under controlled conditions, using a wide
range of waste substrates. In this study, the ability of Cupriavidus necator DSM 545 strain to produce PHB was
tested in a fed-batch strategy providing two different organic substrates. The first is a sugar-based syrup (SBS),
derived from cereal waste. The second is an acetate-rich medium obtained through CO2 -H2 fermentation by the
acetogenic bacterium Acetobacterium woodii. The carbon sources were tested to improve the accumulation of PHB
in the strain. C. necator DSM 545 proved to be able to grow and to perform high accumulation of biopolymer on
waste substrates containing glucose, fructose, and acetate, reaching about 10 g/L of PHB, 83% of biopolymer
accumulation in cell dry mass, in 48 h of fed-batch fermentation in 0.6 L working volume in a bioreactor.
Moreover, a Life Cycle Assessment analysis was performed to evaluate the environmental impact of the process
converting the sugar syrup alone and the integrated one. It demonstrated that the integrated process is more
sustainable and that the most impactful step is the PHB production, followed by the polymer extraction
Hyperplastic cholangitis in a naturally Toxoplasma gondii-infected cat.
Toxoplasma gondii can cause in cats a multisystemic disease involving the liver, lungs, central nervous system and other organs. The liver generally shows multifocal necrotizing hepatitis with possible panlobular extension, with histological evidence of free tachyzoites and/or cysts containing bradyzoites within necrotic foci. Very rarely, toxoplasmosis is expressed by cholangitis, the latter being much more frequently caused in cats by bacteria of intestinal origin.
We report here a case of cholangitis/cholangiohepatitis in a young cat, where cytology of the liver showed multiple maturational stages of protozoa in the cytoplasm of cells of the bile ducts. On the basis of the cytological, histological, ultrastructural and molecular details, the microorganisms were identified as belonging to the species Toxoplasma gondii
COMPARATIVE ANALYSIS OF TECHNICAL, ECONOMICAL AND ENVIRONMENTAL FEASIBILITY OF COGENERATION PLANT USING WOOD BIOMASS
After having identified, in a previous work [6], the possible sites for the location of a new cogeneration plant using wood biomass in the Mountain Community of Carnia, Friuli Venezia Giulia Region (Italy), the technical and economic feasibility and environmental sustainability of such a system has been carried out in order to evaluate the feasibility of the proposed solution
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