Este artigo tem como objetivo realizar uma revisão da literatura científica sobre a cirurgia de revascularização emergência é um procedimento realizado para restaurar o fluxo sanguíneo em áreas do coração que estão comprometidas, muitas vezes resultado trauma, pacientes politraumatizados. Esses podem apresentar lesão cardíaca devido contusões, lacerações ou isquemia relacionada ao trauma. os avanços no tratamento politraumatizados, com ênfase nas intervenções cirúrgicas emergência. Para...

Introdução: A granulomatose com poliangeíte (GPA) é uma vasculite que afeta vasos de pequeno e médio porte, principalmente rins pulmões, raro envolvimento cardíaco. Relato Caso: Homem 54 anos apresentou febre, dor torácica deficiência visual. investigação inicial sugeriu endocardite infecciosa, mas investigações adicionais confirmaram miocardite rápida deterioração renal devido à GPA. O tratamento incluiu imunossupressores diálise, levando a melhora clínica significativa. Conclusão:...

: Visto que a produção de formas breves na literatura vem aumentando no Brasil, este trabalho busca analisar como Cidinha da Silva, em sua mais recente crônica, utiliza recursos microficção abordados por Zavala (2006) para equilibrar brevidade textual e profundidade temática. A autora faz uso fragmentação sugestão narrativa, permitindo os leitores ativem reflexões críticas. análise ressalta habilidade capturar experiências pessoais coletivas, intensificando crítica social através uma...

This paper describes the design and experimental evaluation of a multibit Sigma-Delta (ΣΔ) modulator (ΣΔM) with enhanced dynamic range (DR) through use nonlinear digital-to-analog converters (DACs) in feedback paths. nonlinearity imposes trade-off between DR distortion, which is well suited to intended hearing aid application. The proposed here uses fully-differential self-biased amplifier 4-bit quantizer based on fully comparators employing MOS parametric pre-amplification improve both...

This paper describes an energy harvesting system composed of organic photovoltaic cell (OPV) connected to a DC-DC converter, designed in 130 nm Complementary Metal-Oxide-Semiconductor (CMOS) technology, with quasi- maximum power point tracking (MPPT) algorithm maximize the efficiency, for indoor applications. OPVs are emerging technology potential low cost light harvesting. The OPV current-voltage curves (I-V) under irradiance solar simulator Oriel Sol 3A, at room temperature, obtained and...

The accelerating growth in mobile networks for data communication, covering a diversity of applications, has originated high demand not only low-power devices but also low-cost System on Chip (SoC). An example this is the next generation 5G, which under intense development intending to reach an effective ubiquitous connectivity. CMOS technology offers best trade-off between costs versus performance and facilitates co-integration digital-analog. However, integrating analog RF recent nodes...

This paper presents a circuit topology for G <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">m</sub> -C biquad filter, suitable low frequency signals with amplitude. The cutoff frequencies are obtained reducing the transconductance through current division technique. Moreover, all active devices operating in weak inversion mode lowering requirements level of voltage power supply. A second and fourth order filter configuration, based on...

Wildfires are expected to increase in number, extent, and severity due climate change. Hence, it is ever more important integrate technological developments scientific knowledge into fire management aiming at protecting lives, infrastructure, the environment. In this paper, a decision support system (DSS) adapted Portuguese context based on multi-sensor technologies geographic information (GIS) functionalities proposed leverage operational data, enabling faster informed decisions reduce...

This brief presents an 8-bit 120-MS/s time-interleaved pipeline analog-to-digital converter (ADC) fully based on MOS discrete-time parametric amplification. The ADC, fabricated in a 130-nm CMOS logic process, features active area below 0.12 mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> , where only devices are used. Measurement results for 20-MHz input signal shows that the ADC achieves 39.7 dB of signal-to-noise ratio, 49.3...

This brief presents an analog front-end (AFE) specially developed for a water conductivity measurement system network management applications. Water is one of the best ways to detect problem with in network. In order trigger alarm it only required 10 % variation, which allows simplify design. The proposed sensor uses four platinum micro-machined electrodes, where 6 kHz signal applied outer electrodes and voltage read inner ones. A programmable switched-capacitor (SC) bandpass filter included...

The two projects presented in this paper can be used either as separate assignments different semesters or a final assignment for undergraduate students of electrical engineering. They have main objectives: first, to teach basic electronic circuit design concepts and, second, motivate the learn more about analog design. are: 1) an audio power amplifier, and 2) amplitude-modulated optical link with pulsed light-emitting diode (LED) at emitter photodiode transimpedance amplifier receiver. An...

This brief presents a programmable second-order bandpass switched-capacitor filter implemented for an Internet-of-Things water management sensor node. The circuit, which is based on the Sallen-Key topology, using low-gain amplifier (<;2), avoiding designing high-gain high bandwidth opamps, can be difficult to design in advanced CMOS technologies, due reduction of supply voltage and intrinsic gain transistors. Without gain, circuit becomes sensitive effects parasitic capacitances, have...

In this paper we present a balun LNA with gain adjustable continuously by voltage. The is based on the combination of common-gate and common-source stage to cancel noise distortion stage. To obtain higher same DC voltage drop replace resistors PMOS transistors. This also allows continuous control show that proper design, effect IIP3 IIP2 can be neglected. With approach, avoid use switches, input impedance figure are not affected. Simulation results 130 nm CMOS technology has tunable between...

This paper presents a framework for time-domain optimization of amplifiers employing parallel genetic algorithm based on message passing interface. methodology achieves considerable reduction in the time (up to 19 times faster than serial implementation). Increasing processing capacity allows searching within larger design space using complex transistors models, yielding more accurate results. The optimization, transient simulations, is possible due integration optimizer together with...

A cascode balun-LNA with integrated out-of-band filtering for radio applications between 300 MHz and 1 GHz is proposed. First the high-Q bandpass filter (BPF) low noise amplifier (LNA) are analyzed, separately, in order to understand its characteristics how both circuits can operate together. To allow maximum interferers attenuation a single-ended differential filters used LNA, at input devices, respectively. Using standard 130 nm CMOS technology operating 1.2 V supply voltage, we obtained...

The development of thermal energy storage solutions (TES) in agroindustry allows reduction production costs and improvement operation sustainability. Such require high capacity the ability to adapt existing equipment. use phase change materials (PCMs), which are able store as latent heat, creates new opportunities for heat (LHS, storage) with higher density improved performance when compared sensible storage. New architectures envisaged where is distributed throughout chain, creating...

In recent years, switched capacitor (SC) DC-DC converters have been gaining interest as an attractive solution for implementing power management solutions in small scale low systems, such Internet of Things remote sensor nodes. Since switch circuits can be fully integrated bulk CMOS technology, the number external components is reduced, thus decreasing both production costs and volume system. This brief presents a unit using multi-ratio SC converter, its controlling circuits, designed 130 nm...