Júlio de Oliveira Jr.

A.1 Kinematics : which explores motion without regards to the forces causing it A.2 Forces and momentum A.3 Work and energy https://lnkd.in/gg_a-C_G

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After 12 years of its embryonic version, it is a pleasure to announce that here is the research that I dedicated a lot to completing: the Sun Theorem. A characterization of the star property for flows and vector fields, in general. Take a look at my article!

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🌌 CENTRA Research News! 🌌 Ishfaq Rather and Ilídio Lopes, #postoc and #professor at Instituto Superior Técnico, published "Radial oscillations of hybrid stars and neutron stars including delta baryons: the effect of a slow quark phase transition" in the Journal of #Cosmology and #Astroparticle Physics! #JCAP IOP Publishing They investigated radial #oscillations in hybrid #neutron stars with hadronic outer layers and #quark matter cores. Using a density-dependent relativistic mean-field model, they analyzed the #eigenfrequencies and oscillation functions of different equations of state. Their findings indicate that certain #stellar configurations can remain stable despite high central densities and radial perturbations. This study underscores the potential of future #gravitationalwave detectors and multi-messenger #astronomy, alongside detailed microscopic models, to refine our understanding of the equation of state for high-density #baryonic matter in neutron stars. Read more: https://lnkd.in/d-BNTEfP

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The 'Living With a Star' grant is for a project combining physics modeling and artificial intelligence for better detection and understanding of substorms, which are geomagnetic events in the earth's protective magnetosphere. Learn more: https://ow.ly/5VPt50SAuFi

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In this video, we expand (a+b)² using two different ways and see the connection between algebra and geometry. ... Learn Math the right way. Signup for a free trial class. https://lnkd.in/gGxykPfq

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Nonextensive Statistics in High Energy Collisions | Article by Lucas Q. Rocha, Eugenio Megías, Luis A. Trevisan, Khusniddin K. Olimov, Fuhu Liu and Airton Deppman https://lnkd.in/gYtfFGs6 Institute of Physics | University of Sao Paulo (IFUSP); Universidad de Granada; Universidade Estadual de Ponta Grossa; Physical-Technical Institute of Uzbekistan Academy of Sciences; Shanxi University; MDPI #Statistics #HighEnergy #collision #Physics #OpenAccess This article belongs to the Special Issue Jean Cleymans: A Life for Physics https://lnkd.in/gccp8-kr #Abstract The present paper reports on the methods of the systematic analysis of the high-energy collision distributions—in particular, those adopted by Jean Cleymans. The analysis of data on high-energy collisions, using non-extensive statistics, represents an important part of Jean Cleymans scientific activity in the last decade. The methods of analysis, developed and employed by Cleymans, are discussed and compared with other similar methods. As an example, analyses of a set of the data of proton-proton collisions at the center-of-mass energies, 𝑠−−√=0.9 and 7 TeV, are provided applying different methods and the results obtained are discussed. This line of research has the potential to enlarge our understanding of strongly interacting systems and to be continued in the future.

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Here's some new #physics research relating to the #Casimir effect. You can read about this study below: https://zurl.co/TiXb #reserach #magneticfield

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In his latest explainable-AI deep dive, Conor O'Sullivan offers a comprehensive look at the intuition, theory, and code for Local Interpretable Model-agnostic Explanations (LIME).

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🎊 We have cooperated with Dr. Jose Torres-Jimenez on the topic of "#CombinatorialOptimization for #Constructing Covering Arrays and #Sequence Covering Arrays" https://buff.ly/3ynWzgl Papers are welcomed that report: a) novel constructions that use greedy, metaheuristic, and/or exact approaches to construct CAs and SCAs; b) novel applications of CAs and/or SCAs. #MDPIOpenAccess #ComSciMath_Mdpi

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Seminar | Next Friday (July 12) the International Institute of Physics of the UFRN will host a seminar with Elizaveta Vishnyakova (Universidade Federal de Minas Gerais). The seminar will happen in the auditorium of the IIP at 11:00 am. Members of the local community are invited to participate TITLE: Graded coverings of a supermanifold SPEAKER: Elizaveta Vishnyakova, Federal University of Minas Gerais ABSTRACT: In geometry there is a well-known notion of a covering space. A classical example is the following universal covering: p : R → S^1, t → exp(it). The space of jets can also be considered as a covering of a (super)manifold in the category of graded (super)manifolds. Coverings in the category of graded (super)manifolds we call graded. Another example of this notion is a generalization of a construction of the first obstruction class for splitting a supermanifold suggested by Donagi and Witten in “Super Atiyah classes and obstructions to splitting of supermoduli space”. Our talk is devoted to the notion of graded covering in supergeometry and applications of this idea.

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🌌 CENTRA Research News! 🌌 João Santos and Vítor Cardoso, #PhD student and #professor at Instituto Superior Técnico, published a paper in Physical Review D - American Physical Society: "Radiation reaction in weakly magnetized black holes: Can the tail term be ignored in the strong field regime?" Their study investigates radiation from charged particles around a Schwarzschild black hole in a uniform magnetic field, finding that the nonlocal tail term in the radiation reaction force is essential for capturing particle dynamics, contrary to previous claims. This term is only negligible when the magnetic force greatly dominates the gravitational force. Additionally, they report a "horizon dominance effect," where the energy absorbed by the black hole increases with decreasing particle velocity. This research offers new insights into black hole dynamics and particle behavior in strong gravitational and magnetic fields. 🔗 Learn more: https://lnkd.in/dYmQgfam #Physics #BlackHoles #RadiationReaction #ScientificResearch #CENTRA #Astrophysics #Gravitation #Innovation

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Nuclear Modification Factor in Small System Collisions within Perturbative QCD including Thermal Effects | Article by Lucas Moriggi and Magno Machado https://lnkd.in/gsVsdK-B Universidade Estadual do Centro-Oeste; Federal University of Rio Grande do Sul; MDPI #hadron #collisions #highenergy #nuclear #physics This article belongs to the Special Issue: Jean Cleymans: A Life for Physics https://lnkd.in/gccp8-kr #Abstract In this paper, the nuclear modification factors, 𝑅𝑥𝐴, are investigated for pion production in small system collisions, measured by PHENIX experiment at RHIC (Relativistic Heavy Ion Collider). The theoretical framework is the parton transverse momentum 𝑘𝑇-factorization formalism for hard processes at small momentum fraction, x. Evidence for collective expansion and thermal effects for pions, produced at equilibrium, is studied based on phenomenological parametrization of blast-wave type in the relaxation time approximation. The dependencies on the centrality and on the projectile species are discussed in terms of the behavior of Cronin peak and the suppression of 𝑅𝑥𝐴 at large transverse momentum, 𝑝𝑇. The multiplicity of produced particles, which is sensitive to the soft sector of the spectra, is also included in the present analysis.

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💻 New advancements in understanding the energy demands of modern computers by researchers at IFISC (UIB-CSIC) and collaborators. Their study in Physical Review X presents a novel framework to quantify the minimal energy dissipation of computational tasks. 🔗: https://lnkd.in/dYprGkpc

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Integrating Transition State Theory (TST) with quantum mechanics provides a more comprehensive understanding of chemical reaction dynamics. Quantum mechanics allows for a detailed description of the electronic structure and potential energy surfaces (PES) that underpin TST. Here’s how quantum principles enhance TST: Quantum Mechanical Foundation of Transition State Theory Potential Energy Surfaces (PES) Quantum mechanics is used to calculate PES, which represent the energy of a system as a function of the positions of its nuclei. Methods such as Density Functional Theory (DFT) and ab initio calculations provide accurate PES for complex reactions. Locating the Transition State Quantum mechanical methods identify the transition state by finding the saddle point on the PES. This is the point of highest energy along the reaction coordinate between reactants and products. Techniques like the Nudged Elastic Band (NEB) method and Intrinsic Reaction Coordinate (IRC) calculations help trace the minimum energy path and locate transition states. Quantum Corrections to TST Zero-Point Energy (ZPE) Quantum mechanics accounts for zero-point energy, the lowest possible energy that a quantum mechanical system may have. ZPE can influence the activation energy and, consequently, the reaction rate. TST can be adjusted to include ZPE corrections to the activation energy. Quantum Tunneling Quantum tunneling allows particles to pass through energy barriers, not just over them, affecting reaction rates, especially at low temperatures. TST can incorporate tunneling corrections, using models like the Wigner correction, Eckart tunneling correction, or more sophisticated methods like path integral molecular dynamics. The integration of Transition State Theory with quantum mechanics offers a powerful framework for understanding and predicting the rates of chemical reactions. By leveraging quantum mechanical methods to calculate potential energy surfaces, account for zero-point energy and tunneling effects, and accurately determine thermodynamic properties, researchers can gain deeper insights into reaction mechanisms and design more efficient catalysts and materials. This synergy between TST and quantum mechanics continues to drive advancements in chemistry, biochemistry, and materials science. #quantumchemistry #quatumstate #quatumtransitionstatetheory #quatumphyscis #quatumcomputing #quantum

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#mdpisymmetry Article "Effect of the Size of the Superhydrophobic Regions of Biphilic Surfaces on the Bubble Dynamics" is available at https://lnkd.in/e776Bn_z Authors: José Pereira et al. Universidade de Lisboa Instituto Universitário Militar #heattransfer #bubbledynamics #superhydrophobic

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