J. Carvalho
A5100734050- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Quantum Chromodynamics and Particle Interactions
- Particle Detector Development and Performance
- Dark Matter and Cosmic Phenomena
- Cosmology and Gravitation Theories
- Neutrino Physics Research
- Computational Physics and Python Applications
- Black Holes and Theoretical Physics
- Astrophysics and Cosmic Phenomena
- Radiation Detection and Scintillator Technologies
- Galaxies: Formation, Evolution, Phenomena
- Atomic and Subatomic Physics Research
- Distributed and Parallel Computing Systems
- Particle Accelerators and Free-Electron Lasers
- Geophysics and Gravity Measurements
- Solar and Space Plasma Dynamics
- Muon and positron interactions and applications
- Radio Astronomy Observations and Technology
- Cancer Cells and Metastasis
- Superconducting Materials and Applications
- advanced mathematical theories
- Medical Imaging Techniques and Applications
- Wikis in Education and Collaboration
- Cellular Mechanics and Interactions
University of Coimbra
2016-2025
National Laboratory of Energy and Geology
2023
LIP - Laboratory of Instrumentation and Experimental Particle Physics
2012-2022
Universidade Federal do Paraná
2022
Iscte – Instituto Universitário de Lisboa
2022
Hospital Garcia de Orta
2022
Universidade de Pernambuco
2022
National Observatory
2010-2020
Valongo Observatory
2010-2020
Instituto Português de Oncologia de Coimbra Francisco Gentil
2019
The phenomenological approach to investigate the decay of effective cosmological constant, as recently proposed by Chen and Wu, is generalized include a term proportional ${H}^{2}$ on time dependence $\ensuremath{\Lambda}$, where $H$ Hubble parameter. This new can modify some features standard Friedmann-Robertson-Walker model its free parameter may be adjusted in accordance with nucleosynthesis constraints. also allows deceleration ${q}_{0}$ assuming negative values so that density...
SNO+ is a large liquid scintillator-based experiment located 2km underground at SNOLAB, Sudbury, Canada. It reuses the Sudbury Neutrino Observatory detector, consisting of 12m diameter acrylic vessel which will be filled with about 780 tonnes ultra-pure scintillator. Designed as multipurpose neutrino experiment, primary goal search for neutrinoless double-beta decay (0$\nu\beta\beta$) 130Te. In Phase I, detector loaded 0.3% natural tellurium, corresponding to nearly 800 kg 130Te, an expected...
Biophysical cues influence many aspects of cell behavior. Stiffness the extracellular matrix is probed by cells and transduced into biochemical signals through mechanotransduction protein networks, strongly influencing stem Cellular stemness intimately related with mechanical properties cell, like intracellular contractility stiffness, which in turn are influenced microenvironment. Pluripotency associated soft low-contractility cells. Hence, we postulated that culture substrates, presumably...
The SNO+ experiment is located 2 km underground at SNOLAB in Sudbury, Canada. A low background search for neutrinoless double beta (0νββ) decay will be conducted using 780 tonnes of liquid scintillator loaded with 3.9 natural tellurium, corresponding to 1.3 130Te. This paper provides a general overview the experiment, including detector design, construction process plants, commissioning efforts, electronics upgrades, data acquisition systems, and calibration techniques. collaboration reusing...
We report test beam studies of 11% the production ATLAS Tile Calorimeter modules. The modules were equipped with front-end electronics and all calibration systems planned for final detector. used muon, electron hadron beams ranging in energy from 3 to 350 GeV. Two independent showed that light yield calorimeter was ∼70pe/GeV, exceeding design goal by 40%. Electron provided a at electromagnetic scale. Over 200 cells variation response 2.4%. linearity also measured. Muon an intercalibration...
The 2-point angular correlation function $w(\ensuremath{\theta})$ (2PACF), where $\ensuremath{\theta}$ is the separation between pairs of galaxies, provides transversal baryon acoustic oscillation (BAO) signal almost model independently. In this paper we use 409 337 luminous red galaxies in redshift range $z=[0.440,0.555]$ obtained from tenth data release Sloan Digital Sky Survey (SDSS DR10) to estimate ${\ensuremath{\theta}}_{\mathrm{BAO}}(z)$ 2PACF at six shells. Since noise and...
Even if the Somatic Mutation Theory of carcinogenesis explains many relevant experimental results in tumor origin and development, there are frequent events that not justified, or even contradictory to this widely accepted theory. A Cell Reversal is presented, putting forward hypothesis cancer originated by reversal a differentiated cell into non-differentiated stem-like state, change its intrinsic epigenetic following perturbation on and/or microenvironment. In current proposal cluster stem...
The possibility to avoid the cosmic initial singularity as a consequence of nonlinear effects on Maxwell eletromagnetic theory is discussed. For flat Friedmann-Robertson-Walker (FRW) geometry we derive general nonsingular solution supported by magnetic field plus fluid and nonvanishing vacuum energy density. behavior solutions with time-dependent $\ensuremath{\Lambda}(t)$ term are also examined. As result, it found that functional dependence can uniquely be determined only if remains...
In this letter we study the observed distributions of rotational velocity in a sample more than 16,000 nearby F and G dwarf stars, magnitude complete presenting high precision $Vsin i$ measurements. We show that cannot be fitted by maxwellian. On other hand, an analysis based on both Tsallis Kaniadakis power-law statistics is far most appropriate give very good fit. It also shown single binary stars have similar distributions. This first time, to our knowledge, these two new are tested for...
The Javalambre-Physics of the Accelerated Universe Astrophysical Survey (J-PAS) is a narrow band, very wide field Cosmological to be carried out from Javalambre Observatory in Spain with purpose-built, dedicated 2.5m telescope and 4.7 sq.deg. camera 1.2Gpix. Starting late 2015, J-PAS will observe 8500sq.deg. Northern Sky measure $0.003(1+z)$ photo-z for $9\times10^7$ LRG ELG galaxies plus several million QSOs, sampling an effective volume $\sim 14$ Gpc$^3$ up $z=1.3$ becoming first radial...
We use current measurements of the expansion rate $H(z)$ and cosmic background radiation bounds on spatial curvature Universe to impose cosmological model-independent constraints opacity. To perform our analyses, we compare opacity-free distance modulus from data with those two supernovae Ia compilations: Union2.1 plus most distant spectroscopically confirmed SNe (SNe SCP-0401 $z=1.713$) Sloan Digital Sky Survey (SDSS) subsamples. The influence different light-curve fitters (SALT2 MLCS2K2)...
A sound theory of biological organization is clearly missing for a better interpretation observational results and faster progress in understanding life complexity. The availability such represents fundamental explaining both normal pathological organism development. present work introduces computational implementation some principles development, namely that the default state cells proliferation motility, includes principle variation by closure constraints. In model, bioelectric context...
This paper describes the investigation and findings from root cause analysis (RCA) of a significant collapse that occurred in hydropower tunnel at confidential location. involved about 12,000 m3 material being deposited narrow 20 m width failure zone encountered haunch crown area main power tunnel. contributing factors which include following: (1) degradation highly zeolitized (laumontite-rich) rock within bedding concordant fault zone, termed fault-damaged or FDZ; (2) relatively high situ...
We use fits to recent published CPLEAR data on neutral kaon decays $π^+π^-$ and $πeν$ constrain the CPT--violation parameters appearing in a formulation of system as an open quantum-mechanical system. The obtained upper limits are approaching range suggested by certain ideas concerning quantum gravity.
We calculate the physical properties of seven compact sources mapped by VLBI which show symmetric double structure and compare them with those extended sources. A simple evolution model is studied seems to confirm earlier suggestions that doubles are progenitors
This chapter of the "Flavor in era LHC" workshop report discusses flavor-related issues production and decays heavy states at LHC high momentum transfer Q, both from experimental theoretical perspective. We review top quark physics, discuss flavor aspects several extensions standard model, such as supersymmetry, little Higgs models or with extra dimensions. includes discovery aspects, well measurement properties these states. also present publicly available computational tools related to this topic.
Measurements of the kinematic distributions $J/ψ$ mesons produced in $p-$C, $p-$Ti and $p-$W collisions at $\sqrt{s}=41.6 \mathrm{GeV}$ Feynman-$x$ region $-0.34 < x_{F} 0.14$ for transverse momentum up to $p_T = 5.4 \mathrm{GeV}/c$ are presented. The $x_F$ $p_T$ dependencies nuclear suppression parameter, $α$, also given. results based on $2.4 \cdot 10^{5}$ both $e^+ e^-$ $μ^{+}μ^{-}$ decay channels. data have been collected by HERA-B experiment HERA proton ring DESY laboratory....
Angiogenesis - the growth of new blood vessels from a pre-existing vasculature is key in both physiological processes and on several pathological scenarios such as cancer progression or diabetic retinopathy. For vascular networks to be functional, it required that growing sprouts merge either with an existing functional mature vessel another sprout. This process called anastomosis. We present systematic 2D 3D computational study tissue address capability angiogenic factor gradients drive...