Results for "F. B. Bianco"

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Asymmetry in the presence of migration stabilizes multistrain disease outbreaksJul 28 2009We study the effect of migration between coupled populations, or patches, on the stability properties of multistrain disease dynamics. The epidemic model used in this work displays a Hopf bifurcation to oscillations in a single well mixed population. ... More
Light Echoes of Historic TransientsMar 27 2014Apr 29 2014Light echoes, light from a variable source scattered off dust, have been observed for over a century. The recent discovery of light echoes around centuries-old supernovae in the Milky Way and the Large Magellanic Cloud have allowed the spectroscopic characterization ... More
The LCOGT NetworkNov 29 2010Motivated by the increasing need for observational resources for the study of time varying astronomy, the Las Cumbres Observatory Global Telescope (LCOGT) is a private foundation, whose goal is to build a global network of robotic telescopes for scientific ... More
Symmetries of Transversely Projective FoliationsJan 17 2019Given a (singular, codimension 1) holomorphic foliation F on a complex projective manifold X, we study the group PsAut(X, F) of pseudo-automorphisms of X which preserve F ; more precisely, we seek sufficient conditions for a finite index subgroup of PsAut(X, ... More
A unified explanation for the supernova rate-galaxy mass dependency based on supernovae discovered in Sloan galaxy spectraDec 26 2014Mar 30 2015Using a method to discover and classify supernovae (SNe) in galaxy spectra, we detect 91 Type Ia SNe (SNe Ia) and 16 Type II SNe (SNe II) among 740,000 galaxies of all types and 215,000 star-forming galaxies without active galactic nuclei, respectively, ... More
Detectability of Occultation of Stars by Objects in the Kuiper Belt and Oort CloudMar 19 2007Jul 24 2007The serendipitous detection of stellar occultations by Outer Solar System objects is a powerful method for ascertaining the small end ($r \lesssim 15$ km) of the size distribution of Kuiper Belt Objects and may potentially allow the exploration of objects ... More
Light Echoes of Ancient Transients with the Blanco CTIO 4m TelescopeFeb 12 2015For over a century, light echoes have been observed around variable stars and transients. The discovery of centuries-old light echoes from supernovae in the Large Magellanic Cloud has allowed the spectroscopic characterization of these events using modern ... More
Epidemics with Multistrain Interactions: The Interplay Between Cross Immunity and Antibody-Dependent EnhancementDec 19 2008Jul 28 2009This paper examines the interplay of the effect of cross immunity and antibody-dependent enhancement (ADE) in mutistrain diseases. Motivated by dengue fever, we study a model for the spreading of epidemics in a population with multistrain interactions ... More
Converging towards the optimal path to extinctionDec 21 2011Extinction appears ubiquitously in many fields, including chemical reactions, population biology, evolution, and epidemiology. Even though extinction as a random process is a rare event, its occurrence is observed in large finite populations. Extinction ... More
Maximal Sensitive Dependence and the Optimal Path to Epidemic ExtinctionMar 03 2010Mar 24 2010Extinction of an epidemic or a species is a rare event that occurs due to a large, rare stochastic fluctuation. Although the extinction process is dynamically unstable, it follows an optimal path that maximizes the probability of extinction. We show that ... More
Clues To The Nature of SN 2009ip from Photometric and Spectroscopic Evolution to Late TimesFeb 07 2014We present time series photometric and spectroscopic data for the transient SN 2009ip from the start of its outburst in September 2012 until November 2013. This data was collected primarily with the new robotic capabilities of the Las Cumbres Observatory ... More
On the classification of GRBs and their occurrence ratesFeb 08 2016Oct 27 2016There is mounting evidence for the binary nature of the progenitors of gamma-ray bursts (GRBs). For a long GRB, the induced gravitational collapse (IGC) paradigm proposes as progenitor, or "in-state", a tight binary system composed of a carbon-oxygen ... More
GRB 140619B: a short GRB from a binary neutron star merger leading to black hole formationDec 02 2014Jun 19 2015We show the existence of two families of short GRBs, both originating from the merger of binary neutron stars (NSs): family-1 with $E_{iso}<10^{52}$ erg, leading to a massive NS as the merged core, and family-2 with $E_{iso}>10^{52}$ erg, leading to a ... More
Multi-color Optical and NIR Light Curves of 64 Stripped-Envelope Core-Collapse SupernovaeMay 06 2014We present a densely-sampled, homogeneous set of light curves of 64 low redshift (z < 0.05) stripped-envelope supernovae (SN of type IIb, Ib, Ic and Ic-bl). These data were obtained between 2001 and 2009 at the Fred L. Whipple Observatory (FLWO) on Mt. ... More
On the classification of GRBs and their occurrence ratesFeb 08 2016Sep 08 2016There is mounting evidence for the binary nature of the progenitors of gamma-ray bursts (GRBs). For a long GRB, the induced gravitational collapse (IGC) paradigm proposes as progenitor, or "in-state", a tight binary system composed of a carbon-oxygen ... More
The Spectral SN-GRB Connection: Systematic Spectral Comparisons between Type Ic Supernovae, and broad-lined Type Ic Supernovae with and without Gamma-Ray BurstsSep 23 2015Jul 29 2016We present the first systematic investigation of spectral properties of 17 Type Ic Supernovae (SNe Ic), 10 broad-lined SNe Ic (SNe Ic-bl) without observed Gamma-Ray Bursts (GRBs) and 11 SNe Ic-bl with GRBs (SN-GRBs) as a function of time in order to probe ... More
A Cicerone for the Physics of CharmSep 04 2003After briefly recapitulating the history of the charm quantum number we sketch the experimental environments and instruments employed to study the behaviour of charm hadrons and then describe the theoretical tools for treating charm dynamics. We discuss ... More
A Cicerone for the physics of charm, Part I: production, spectroscopy, lifetimesJun 18 2003Sep 05 2003This is part I of a two-part review of charm physics. After briefly recapitulating the history of the charm quantum number we sketch the experimental environments and instruments employed to study the behaviour of charm hadrons and then describe the theoretical ... More
Analyzing the Largest Spectroscopic Dataset of Stripped Supernovae to Improve Their Identifications and Constrain Their ProgenitorsOct 27 2015Jul 31 2016Using the largest spectroscopic dataset of stripped-envelope core-collapse supernovae (stripped SNe), we present a systematic investigation of spectral properties of Type IIb SNe (SNe IIb), Type Ib SNe (SNe Ib), and Type Ic SNe (SNe Ic). Prior studies ... More
New Charm Results from FocusDec 01 2004Dec 08 2004New results from the photoproduction experiment FOCUS are reported: Dalitz plot analysis, semileptonic form factor ratios and excited meson spectroscopy.
On the rate and on the gravitational wave emission of short and long GRBsFeb 10 2016Oct 25 2016GRBs, traditionally classified as "long" and "short", have been often assumed, till recently, to originate from a single black hole (BH) with an ultrarelativistic jetted emission. There is evidence that both long and short bursts have as progenitors merging ... More
On the rate and on the gravitational wave emission of short and long GRBsFeb 10 2016Oct 20 2016GRBs, traditionally classified as "long" and "short", have been often assumed, till recently, to originate from a single black hole (BH) with an ultrarelativistic jetted emission. There is evidence that both long and short bursts have as progenitors merging ... More
New FOCUS results on charm mixing and CP violationNov 17 2000Nov 29 2000We present a summary of recent results on CP violation and mixing in the charm quark sector based on a high statistics sample collected by photoproduction experiment FOCUS (E831 at Fermilab). We have measured the difference in lifetimes for the $D^0$ ... More
Detecting long and short memory via spectral methodsOct 01 2006We study the properties of memory of a financial time series adopting two different methods of analysis, the detrended fluctuation analysis (DFA) and the analysis of the power spectrum (PSA). The methods are applied on three time series: one of high-frequency ... More
Spectroscopy of D MesonsDec 29 2005Feb 12 2006The scenario of heavy quark meson spectroscopy underwent recently a major revolution, after the observation of BABAR and CLEO, confirmed by BELLE, of $\DsJ$ L=1 excited states, and by further evidences by SELEX. These experimental results have cast doubts ... More
Large age-gap face verification by feature injection in deep networksFeb 19 2016This paper introduces a new method for face verification across large age gaps and also a dataset containing variations of age in the wild, the Large Age-Gap (LAG) dataset, with images ranging from child/young to adult/old. The proposed method exploits ... More
Charm OverviewNov 23 1999This paper is aimed at giving a complete review of the latest (post-1998 Physics in Collision conference) experimental results on charm physics.
DEAR, FINUDA, KLOE: Kaonic Atoms, Hypernuclei and CP-Violation at the DAFNE Phi-FactoryDec 18 1997Physics at DAFNE, the new Frascati e+e- machine, is reviewed, as well as the esperiments: DEAR - search for KN exotic atoms, FINUDA - spectroscopy and decays of hypernuclei, and KLOE - a multipurpose detector designed for measuring direct CP violation ... More
Light Quark Spectroscopy Results from FOCUS and E687Dec 12 2002Dec 13 2002Using the FOCUS spectrometer (experiments 687 and 831 at Fermilab) we confirm the existence of a diffractively photoproduced enhancement in $K^+K^- $ at 1750 \mevcc with nearly 100 times the statistics of previous experiments. We also observe a narrow ... More
Charm Lifetimes and Semileptonic DecaysFeb 27 1996This paper gives an experimental overview of current status and open questions on charm lifetimes and semileptonic decays, the latter including new results presented by E687 and CLEO at this Conference.
A Robust Filter for the BeppoSAX Gamma Ray Burst Monitor TriggersDec 23 1999The BeppoSAX Gamma Ray Burst Monitor (GRBM) is triggered any time a statistically significant counting excess is simultaneously revealed by at least two of its four independent detectors. Several spurious effects, including highly ionizing particles crossing ... More
A self-consistent study of multipole response in neutron-rich nuclei using a modified realistic potentialDec 05 2014The multipole response of neutron rich O and Sn isotopes is computed in Tamm-Dancoff and random-phase approximations using the canonical Hartree-Fock-Bogoliubov quasi-particle basis. The calculations are performed using an intrinsic Hamiltonian composed ... More
Pluto's Atmosphere Does Not CollapseSep 03 2013Combining stellar occultation observations probing Pluto's atmosphere from 1988 to 2013 and models of energy balance between Pluto's surface and atmosphere, we conclude that Pluto's atmosphere does not collapse at any point in its 248-year orbit. The ... More
A Novel Approach for an Integrated Straw tube-Microstrip DetectorDec 28 2005We report on a novel concept of silicon microstrips and straw tubes detector, where integration is accomplished by a straw module with straws not subjected to mechanical tension in a Rohacell $^{\circledR}$ lattice and carbon fiber reinforced plastic ... More
Evidences for a double component in GRB 101023Nov 09 2011We present the results of the analysis of GRB 101023 in the fireshell scenario. Its redshift has not been determined due to the lack of data in the optical band, so we tried to infer it from the Amati Relation, obtaining z=0.9. Its light curve presents ... More
On the structure of the burst and afterglow of Gamma-Ray Bursts I: the radial approximationFeb 07 2003We have proposed three paradigms for the theoretical interpretation of gamma-ray bursts (GRBs). (1) The relative space-time transformation (RSTT) paradigm emphasizes how the knowledge of the entire world-line of the source from the moment of gravitational ... More
A Cloud-based architecture for the Cherenkov Telescope Array observation simulations. Optimisation, design, and resultsJan 02 2019Simulating and analysing detailed observations of astrophysical sources for very high energy (VHE) experiments, like the Cherenkov Telescope Array (CTA), can be a demanding task especially in terms of CPU consumption and required storage. In this context, ... More
Two- and Three-Dimensional Reconstruction and Analysis of the Straw Tubes Tomography in the Btev ExperimentDec 28 2005A check of the eccentricity of the aluminised kapton straw tubes used in the BTeV experiment is accomplished using X-ray tomography of the section of tubes modules. 2 and 3-dimensional images of the single tubes and of the modules are reconstructed and ... More
Comparison of Diversity of Type IIb Supernovae with Asymmetry in Cassiopeia A Using Light EchoesMay 10 2016Sep 21 2016We compare the diversity of spectral line velocities in a large sample of type IIb supernovae (SNe IIb) with the expected asphericity in the explosion, as measured from the light echoes of Cassiopeia A (Cas A), which was a historical galactic SN IIb. ... More
GRB 090510: a disguised short GRB with the highest Lorentz factor and circumburst mediumJun 14 2013GRB 090510, observed both by Fermi and AGILE satellites, is the first bright short-hard Gamma-Ray Burst (GRB) with an emission from the keV up to the GeV energy range. Within the Fireshell model, we interpret the faint precursor in the light curve as ... More
Monte Carlo Method for Calculating Oxygen Abundances and Their Uncertainties from Strong-Line Flux MeasurementsMay 22 2015May 07 2016We present the open-source Python code pyMCZ that determines oxygen abundance and its distribution from strong emission lines in the standard metallicity calibrators, based on the original IDL code of Kewley & Dopita (2002) with updates from Kewley & ... More
The EMBH model in GRB 991216 and GRB 980425Sep 14 2004This is a summary of the two talks presented at the Rome GRB meeting by C.L. Bianco and R. Ruffini. It is shown that by respecting the Relative Space-Time Transformation (RSTT) paradigm and the Interpretation of the Burst Structure (IBS) paradigm, important ... More
The GRB980425-SN1998bw Association in the EMBH ModelJul 07 2004Our GRB theory, previously developed using GRB 991216 as a prototype, is here applied to GRB 980425. We fit the luminosity observed in the 40--700 keV, 2--26 keV and 2--10 keV bands by the BeppoSAX satellite. In addition the supernova SN1998bw is the ... More
On the physical processes which lie at the bases of time variability of GRBsJun 28 2001The relative-space-time-transformation (RSTT) paradigm and the interpretation of the burst-structure (IBS) paradigm are applied to probe the origin of the time variability of GRBs. Again GRB 991216 is used as a prototypical case, thanks to the precise ... More
A New Astrophysical "Triptych": GRB030329/SN2003dh/URCA-2Jul 23 2004We analyze the data of the Gamma-Ray Burst/Supernova GRB030329/SN2003dh system obtained by HETE-2 (GCN [1]), R-XTE (GCN [2]), XMM (Tiengo et al. [3]) and VLT (Hjorth et al. [4]) within our theory (Ruffini et al. [5] and references therein) for GRB030329. ... More
Relative space-time transformations in GRBsJun 28 2001The GRB 991216 and its relevant data acquired from the BATSE experiment and RXTE and Chandra satellites are used as a prototypical case to test the theory linking the origin of gamma ray bursts (GRBs) to the process of vacuum polarization occurring during ... More
Endotaxial Si nanolines in Si(001):HMar 16 2011We present a detailed study of the structural and electronic properties of a self-assembled silicon nanoline embedded in the H-terminated silicon (001) surface, known as the Haiku stripe. The nanoline is a perfectly straight and defect free endotaxial ... More
New perspectives in physics and astrophysics from the theoretical understanding of Gamma-Ray BurstsFeb 26 2003If due attention is given in formulating the basic equations for the Gamma-Ray Burst (GRB) phenomenon and in performing the corresponding quantitative analysis, GRBs open a main avenue of inquiring on totally new physical and astrophysical regimes. This ... More
On the structures in the afterglow peak emission of gamma ray burstsOct 30 2002Using GRB 991216 as a prototype, it is shown that the intensity substructures observed in what is generally called the "prompt emission" in gamma ray bursts (GRBs) do originate in the collision between the accelerated baryonic matter (ABM) pulse with ... More
Stripped-envelope supernova rates and host-galaxy propertiesSep 28 2015The progenitors of stripped-envelope supernovae (SNe Ibc) remain to be conclsuively identified, but correlations between SN rates and host-galaxy properties can constrain progenitor models. Here, we present one result from a re-analysis of the rates from ... More
On the instantaneous spectrum of Gamma-Ray BurstsMay 14 2004A theoretical attempt to identify the physical process responsible for the afterglow emission of Gamma-Ray Bursts (GRBs) is presented, leading to the occurrence of thermal emission in the comoving frame of the shock wave giving rise to the bursts. The ... More
Intrinsic filtering errors of Lagrangian particle tracking in LES flow fieldsAug 30 2011Large-Eddy Simulations (LES) of two-phase turbulent flows exhibit quantitative differences in particle statistics if compared to Direct Numerical Simulations (DNS) which, in the context of the present study, is considered the exact reference case. Differences ... More
LOSS Revisited - II: The relative rates of different types of supernovae vary between low- and high-mass galaxiesSep 09 2016In Paper I of this series, we showed that the ratio between stripped-envelope supernova (SE SN) and Type II SN rates reveals a significant SE SN deficiency in galaxies with stellar masses $\lesssim 10^{10}~{\rm M}_\odot$. Here, we test this result by ... More
LOSS Revisited - I: Unraveling correlations between supernova rates and galaxy properties, as measured in a re-analysis of the Lick Observatory Supernova SearchSep 09 2016Most types of supernovae (SNe) have yet to be connected with their progenitor stellar systems. Here, we re-analyze the ten-year 1998-2008 SN sample collected by the Lick Observatory Supernova Search (LOSS) in order to constrain the progenitors of SNe ... More
Hypertemporal Imaging of NYC Grid DynamicsNov 14 2016Hypertemporal visible imaging of an urban lightscape can reveal the phase of the electrical grid granular to individual housing units. In contrast to in-situ monitoring or metering, this method offers broad, persistent, real-time, and non-permissive coverage ... More
One dimensional Si-in-Si(001) template for single-atom wire growthJul 13 2010Single atom metallic wires of arbitrary length are of immense technological and scientific interest. We describe a novel silicon-only template enabling the self-organised growth of isolated micrometer long surface and subsurface single-atom chains. It ... More
On a possible GRB-supernova time sequenceJun 28 2001The data from the Chandra satellite on the iron emission lines in the afterglow of GRB 991216 are used to give further support for the EMBH theory, which links the origin of the energy of GRBs to the extractable energy of electromagnetic black holes (EMBHs), ... More
On the interpretation of the burst structure of GRBsJun 28 2001Jul 20 2001Given the very accurate data from the BATSE experiment and RXTE and Chandra satellites, we use the GRB 991216 as a prototypical case to test the EMBH theory linking the origin of the energy of GRBs to the electromagnetic energy of black holes. The fit ... More
Optical spectroscopy of SDSS J004054.65-0915268: three possible scenarios for the classification. A z \sim 5 BL Lacertae, blue FSRQ or a weak emission line quasarDec 16 2015The haunt of high redshift BL Lacerate objects is day by day more compelling, to firmly understand their intrinsic nature and evolution. SDSS J004054.65-0915268 is, at the moment, one of the most distant BL Lac candidate at z \sim 5 (Plotkin et al 2010). ... More
Micrometric Position Monitoring Using Fiber Bragg Grating Sensors in Silicon DetectorsDec 28 2005We show R&D results including long term stability, resolution, radiation hardness and characterization of Fiber Grating sensors used to monitor structure deformation, repositioning and surveying of silicon detector in High Energy Physics.
An Uncoventional Approach for a Straw Tube-Microstrip DetectorDec 16 2004We report on a novel concept of silicon microstrips and straw tubes detector, where integration is accomplished by a straw module with straws not subjected to mechanical tension in a Rohacell lattice and carbon fiber reinforced plastic shell. Results ... More
Comparative Analysis of SN 2012dn Optical Spectra: Days -14 to +114Mar 12 2016SN 2012dn is a super-Chandrasekhar mass candidate in a purportedly normal spiral (SAcd) galaxy, and poses a challenge for theories of type Ia supernova diversity. Here we utilize the fast and highly parameterized spectrum synthesis tool, SYNAPPS, to estimate ... More
Challenges in optics for Extremely Large Telescope instrumentationMar 28 2006We describe and summarize the optical challenges for future instrumentation for Extremely Large Telescopes (ELTs). Knowing the complex instrumental requirements is crucial for the successful design of 30-60m aperture telescopes. After all, the success ... More
WMAP confirming the ellipticity in BOOMERanG and COBE CMB mapsFeb 17 2004Feb 24 2004The recent study of BOOMERanG 150 GHz Cosmic Microwave Background (CMB) radiation maps have detected ellipticity of the temperature anisotropy spots independent on the temperature threshold. The effect has been found for spots up to several degrees in ... More
Ellipticity analysis of the BOOMERanG CMB mapsOct 01 2002Nov 17 2003The properties of the Cosmic Microwave Background (CMB) maps carry valuable cosmological information. Here we report the results of the analysis hot and cold CMB anisotropy spots in the BOOMERanG 150 GHz map in terms of number, area, ellipticity, vs. ... More
Light echoes reveal an unexpectedly cool Eta Carinae during its 19th-century Great EruptionDec 09 2011Eta Carinae (Eta Car) is one of the most massive binary stars in the Milky Way. It became the second-brightest star in the sky during its mid-19th century "Great Eruption," but then faded from view (with only naked-eye estimates of brightness). Its eruption ... More
Characterization of the GEM foil materialsDec 29 2015Systematic studies on the GEM foil material are performed to measure the moisture diffusion rate and saturation level. These studies are important because the presence of this compound inside the detector's foil can possibly change its mechanical and ... More
Is there a common origin for the WMAP low multipole and for the ellipticity in BOOMERanG CMB maps?Dec 11 2003Dec 16 2003We have measured the ellipticity of several degree scale anisotropies in the BOOMERanG maps of the Cosmic Microwave Background (CMB) at 150 GHz. The average ellipticity is around 2.6-2.7. The biases of the estimator of the ellipticity and for the noise ... More
A common behavior in the late X-ray afterglow of energetic GRB-SN systemsOct 30 2012Feb 05 2013The possibility to divide GRBs in different subclasses allow to understand better the physics underlying their emission mechanisms and progenitors. The induced gravitational collapse scenario proposes a binary progenitor to explain the time-sequence in ... More
Sensitivity and environmental response of the CMS RPC gas gain monitoring systemDec 09 2008Results from the gas gain monitoring (GGM) system for the muon detector using RPC in the CMS experiment at the LHC is presented. The system is designed to provide fast and accurate determination of any shift in the working point of the chambers due to ... More
A Search for Occultations of Bright Stars by Small Kuiper Belt Objects using Megacam on the MMTMar 18 2009Mar 20 2009We conducted a search for occultations of bright stars by Kuiper Belt Objects (KBOs) to estimate the density of sub-km KBOs in the sky. We report here the first results of this occultation survey of the outer solar system conducted in June 2007 and June/July ... More
A GRB and Broad-lined Type Ic Supernova from a Single Central EngineAug 08 2017Unusually high velocities (< ~0.1c) and correspondingly high kinetic energies have been observed in a subset of Type Ic supernovae (so-called "broad-lined Ic" supernovae; SNe Ic-BL), prompting a search for a central engine model capable of generating ... More
Novel distance indicator for gamma-ray bursts associated with supernovaeApr 05 2013Context. It has been proposed that the temporal coincidence of a gamma-ray burst (GRB) and a type Ib/c supernova (SN) can be explained with the concept of induced gravitational collapse (IGC), induced by the matter ejected from an SN Ib/c accreting onto ... More
User Preferences Modeling and Learning for Pleasing Photo Collage GenerationJun 01 2015In this paper we consider how to automatically create pleasing photo collages created by placing a set of images on a limited canvas area. The task is formulated as an optimization problem. Differently from existing state-of-the-art approaches, we here ... More
On the primitivity of birational transformations of irreducible symplectic manifoldsApr 18 2016Let $f\colon X\dashrightarrow X$ be a bimeromorphic transformation of a complex irreducible symplectic manifold $X$. Some important dynamical properties of $f$ are encoded by the induced linear automorphism $f^*$ of $H^2(X,\mathbb Z)$. Our main result ... More
GRB 970228 Within the EMBH ModelJul 12 2004We consider the gamma-ray burst of 1997 February 28 (GRB 970228) within the ElectroMagnetic Black Hole (EMBH) model. We first determine the value of the two free parameters that characterize energetically the GRB phenomenon in the EMBH model, that is ... More
Space-to-ground quantum-communication using an optical ground station: a feasibility studyAug 10 2004We have tested the experimental prerequisites for a Space-to-Ground quantum communication link between satellites and an optical ground station. The feasibility of our ideas is being assessed using the facilities of the ASI Matera Laser Ranging Observatory ... More
Evidence for a proto-black hole and a double astrophysical component in GRB 101023Dec 13 2011Jan 02 2012[Shortened] Context: [...] we point out a striking similarity between GRB 101023 and GRB 090618. We explore the possibility that these sources are members of a new GRB family related to a single core-collapse. We use this understanding of the source in ... More
The GRB 071112C: A Case Study of Different Mechanisms in X-ray and Optical Temporal EvolutionFeb 07 2012We present the study on GRB 071112C X-ray and optical light curves. In these two wavelength ranges, we have found different temporal properties. The R-band light curve showed an initial rise followed by a single power-law decay, while the X-ray light ... More
Light Echoes from Eta Carinae's Great Eruption: Spectrophotometric Evolution and the Rapid Formation of Nitrogen-rich MoleculesMar 27 2014Apr 15 2014We present follow-up optical imaging and spectroscopy of one of the light echoes of $\eta$ Carinae's 19th-century Great Eruption discovered by Rest et al. (2012). By obtaining images and spectra at the same light echo position between 2011 and 2014, we ... More
The Rise-Time of Normal and Subluminous Type Ia SupernovaeSep 27 2011We calculate the average stretch-corrected rise-time of type Ia supernovae (SNe Ia) in the Supernova Legacy Survey. We use the aggregate lightcurves of spectroscopic and photometrically identified SNe Ia to fit the rising part of the lightcurve with a ... More
The TAOS Project Stellar Variability II. Detection of 15 Variable StarsMar 12 2010The Taiwanese-American Occultation Survey (TAOS) project has collected more than a billion photometric measurements since 2005 January. These sky survey data-covering timescales from a fraction of a second to a few hundred days-are a useful source to ... More
The Taiwanese-American Occultation Survey: The Multi-Telescope Robotic ObservatoryFeb 04 2008Mar 16 2009The Taiwanese-American Occultation Survey (TAOS) operates four fully automatic telescopes to search for occultations of stars by Kuiper Belt Objects. It is a versatile facility that is also useful for the study of initial optical GRB afterglows. This ... More
Constraining Type Ia Supernovae progenitors from three years of SNLS dataJun 20 2011Jul 15 2011While it is generally accepted that Type Ia supernovae are the result of the explosion of a carbon-oxygen White Dwarf accreting mass in a binary system, the details of their genesis still elude us, and the nature of the binary companion is uncertain. ... More
The TAOS Project: Results From Seven Years of Survey DataJan 25 2013The Taiwanese-American Occultation Survey (TAOS) aims to detect serendipitous occultations of stars by small (about 1 km diameter) objects in the Kuiper Belt and beyond. Such events are very rare (<0.001 events per star per year) and short in duration ... More
The TAOS Project: Statistical Analysis of Multi-Telescope Time Series DataFeb 18 2010The Taiwanese-American Occultation Survey (TAOS) monitors fields of up to ~1000 stars at 5 Hz simultaneously with four small telescopes to detect occultation events from small (~1 km) Kuiper Belt Objects (KBOs). The survey presents a number of challenges, ... More
Orbital Magnetization as a Local PropertyJan 26 2013The modern expressions for polarization $\P$ and orbital magnetization $\M$ are $\k$-space integrals. But a genuine bulk property should also be expressible in $\r$-space, as unambiguous function of the ground-state density matrix, "nearsighted" in insulators, ... More
Critical behavior of a water monolayer under hydrophobic confinementDec 12 2012Mar 21 2014The properties of water can have a strong dependence on the confinement. Here, we consider a water monolayer nanoconfined between hydrophobic parallel walls under conditions that prevent its crystallization. We investigate, by simulations of a many-body ... More
How water contributes to pressure and cold denaturation of proteinsMay 28 2015Jul 14 2015The mechanisms of cold- and pressure-denaturation of proteins are matter of debate and are commonly understood as due to water-mediated interactions. Here we study several cases of proteins, with or without a unique native state, with or without hydrophilic ... More
Compression for trace zero points on twisted Edwards curvesJul 27 2015We propose two optimal representations for the elements of trace zero subgroups of twisted Edwards curves. For both representations, we provide efficient compression and decompression algorithms. The efficiency of the algorithm is compared with the efficiency ... More
Non-monotonous polymer translocation time across corrugated channelsApr 12 2016We study the translocation of polymers across varying-section channels. Using systematic approximations, we derive a simplified model that reduces the problem of polymer translocation through varying-section channels to that of a point-like particle under ... More
Orbital Magnetization in Insulators: Bulk vs. SurfaceAug 05 2015Mar 22 2016The orbital magnetic moment of a finite piece of matter is expressed in terms of the one-body density matrix as a simple trace. We address a macroscopic system, insulating in the bulk, and we show that its orbital moment is the sum of a bulk term and ... More
A Generic Library for Stencil ComputationsJul 06 2012In this era of diverse and heterogeneous computer architectures, the programmability issues, such as productivity and portable efficiency, are crucial to software development and algorithm design. One way to approach the problem is to step away from traditional ... More
Dictionary learning of sound speed profilesSep 15 2016To provide constraints on their inversion, ocean sound speed profiles (SSPs) often are modeled using empirical orthogonal functions (EOFs). However, this regularization, which uses the leading order EOFs with a minimum-energy constraint on their coefficients, ... More
Mapping topological order in coordinate spaceNov 24 2011Jan 20 2012The organization of the electrons in the ground state is classified by means of topological invariants, defined as global properties of the wavefunction. Here we address the Chern number of a two-dimensional insulator and we show that the corresponding ... More
Aging in Financial MarketJun 06 2006We analyze the data of the Italian and U.S. futures on the stock markets and we test the validity of the Continuous Time Random Walk assumption for the survival probability of the returns time series via a renewal aging experiment. We also study the survival ... More
Unexpected volatility and intraday serial correlationOct 03 2006We study the impact of volatility on intraday serial correlation, at time scales of less than 20 minutes, exploiting a data set with all transaction on SPX500 futures from 1993 to 2001. We show that, while realized volatility and intraday serial correlation ... More
Sparse travel time tomography with adaptive dictionariesDec 16 2017Jan 14 2018We develop a 2D travel time tomography method which regularizes the inversion by modeling groups of slowness pixels from discrete slowness maps, called patches, as sparse linear combinations of atoms from a dictionary. We further propose to learn optimal ... More
Hubble Space Telescope studies of low-redshift Type Ia supernovae: Evolution with redshift and ultraviolet spectral trendsMay 31 2012Aug 11 2012We present an analysis of the maximum light, near ultraviolet (NUV; 2900-5500 A) spectra of 32 low redshift (0.001<z<0.08) Type Ia supernovae (SNe Ia), obtained with the Hubble Space Telescope (HST). We combine this spectroscopic sample with high-quality ... More
Gas Analysis and Monitoring Systems for the RPC Detector of CMS at LHCDec 30 2006The Resistive Plate Chambers (RPC) detector of the CMS experiment at the LHC proton collider (CERN, Switzerland) will employ an online gas analysis and monitoring system of the freon-based gas mixture used. We give an overview of the CMS RPC gas system, ... More