Results 11 to 20 of about 17,736 (70)
Revista de Saúde Pública, 1976 É descrita a descoberta, por Manoel de Abreu, da roentgenfotografia e sua aplicação maciça na população brasileira onde muitas vezes, por exigência legal, crianças, jovens, mulheres grávidas eram submetidos a exames repetidos e, freqüentemente, desnecessários. Com as explosões atômicas de Hiroshima e Nagasaki e o conhecimento de que mesmo doses mínimas
Febus Gikovate, Diogo Pupo Nogueira
openaire +4 more sources
Cosmologia com aglomerados de galáxias [PDF]
Anais do I Encontro Brasileiro de Meninas e Mulheres da
Astrof\'isica, Gravita\c{c}\~ao e Cosmologia - As Astrocientistas. S\~ao
Paulo: Blucher, 2022. ISSN 2358-2359, 2022 Galaxy clusters are important cosmological probes since their abundance and spatial distribution are directly linked to structure formation on large scales. The principal uncertainty source on the cosmological parameter constraints concerns the cluster mass estimation from mass proxies.
arxiv +1 more source
Features and Potentialities of Static Passive EM Skins for NLOS Specular Wireless Links [PDF]
, 2022 The ability of passive flat patterned electromagnetic skins (EMSs) to overcome the asymptotic limit of the total path attenuation (TPA) of flat metallic reflectors of arbitrary size in non-line-of-sight (NLOS) specular wireless links is assessed. Closed-form expressions for the achievable TPA in EMS-powered NLOS links as well as the condition on the ...
arxiv +1 more source
Multi-Scale Single-Bit RP-EMS Synthesis for Advanced Propagation Manipulation through System-by-Design [PDF]
, 2022 A new method for synthesizing Single-Bit Reconfigurable Passive Electromagnetic Skins (1RP-EMSs) featuring advanced beam shaping capabilities is proposed. By using single-bit unit cells, the multi-scale problem of controlling 1RP-EMSs is formulated as a two-phase process.
arxiv +1 more source
On the Design of Modular Reflecting EM Skins for Enhanced Urban Wireless Coverage [PDF]
, 2021 The design of modular, passive, and static artificial metasurfaces to be used as electromagnetic skins (EMSs) of buildings for improving the coverage in urban millimeter-wave communication scenarios is addressed. Towards this end, an ad-hoc design strategy is presented to determine optimal trade-off implementative solutions that assure a suitable ...
arxiv +1 more source
Revista de Saúde Pública, 2006 É descrita a descoberta, por Manoel de Abreu, da roentgenfotografia e sua aplicação maciça na população brasileira onde muitas vezes, por exigência legal, crianças, jovens, mulheres grávidas eram submetidos a exames repetidos e, freqüentemente ...
Febus Gikovate, Diogo Pupo Nogueira
doaj +1 more source
Multi-Resolution Subspace-Based Optimization Method for the Retrieval of 2D Perfect Electric Conductors [PDF]
, 2022 Perfect Electric Conductors (PECs) are imaged integrating the subspace-based optimizationmethod (SOM) within the iterative multi-scaling scheme (IMSA). Without a-priori information on the number or/and the locations of the scatterers and modelling their EM scattering interactions with a (known) probing source in terms of surface electric field integral
arxiv +1 more source
Optically-Transparent EM Skins for Outdoor-to-Indoor mm-Wave Wireless Communications [PDF]
IEEE Access, 2024, 2023 Optically-transparent opportunistic electromagnetic skins (OTO-EMSs) are proposed to enable outdoor-to-indoor (O2I) millimiter-wave (mmW) wireless communications with existing windows/glass-panels. More in detail, static passive EMSs consisting of optically-transparent conducting patterned layers attached to standard glass-panels are designed.
arxiv +1 more source
Generalized Analysis and Unified Design of EM Skins [PDF]
, 2022 A generalized formulation is derived for the analysis of the field manipulation properties of electromagnetic skins (EMSs) in the working regimes of interest for wireless communications. Based on such a theoretical framework, a unified method for the design of anomalous-reflecting and focusing EMSs is presented.
arxiv +1 more source
On the Design of Complex EM Devices and Systems through the System-by-Design Paradigm -- A Framework for Dealing with the Computational Complexity [PDF]
, 2021 The System-by-Design (SbD) is an emerging engineering framework for the optimization-driven design of complex electromagnetic (EM) devices and systems. More specifically, the computational complexity of the design problem at hand is addressed by means of a suitable selection and integration of functional blocks comprising problem-dependent and ...
arxiv +1 more source