Desarrollo e implementación de un relay de mensajería para la aplicación Kde-Connect.

[EN]Nowadays, with the unstoppable raise of different types of electronic devices (mobile phones, tablets, computers…), it has become a necessity to share all the information and functionalities they have. In order to achieve that, back in the 2013, KDE community developed an application called KDE-Connect. This application has been really useful since then, but it’s limited as it can only operate with devices in the same network. Therefore, in the following pages, this project will explain and develop the best solution to extend its functionalities so any pair of devices can share information in an anonymous, private and easy way, at any geographic location.

Juventude, tecnologia e educação: perspectivas para o ensino médio

O presente século está sendo marcado pelo aceleramento da tecnologia eletrônica. Nesse momento se torna imprescindível a formação e compromisso dos professores com o ensino e a escola que devem trazer em pauta as TICs (Tecnologias da Informação e Comunicação). Através das relações diárias, o ser universal (o homem) pensa, sente e age a todo instante através das relações sociais de que fazem parte. As pessoas agem a partir de uma relação de trocas culturais, modificam a si mesmas, aos outros e à natureza, por esse motivo precisa haver uma educação voltada para a cidadania.O objetivo desta dissertação é contribuir para a análise dos desafios que o jovem aluno do ensino médio enfrenta hoje, o que diz o professor e a preparação que as escolas públicas oferecem para o futuro desses alunos em uma sociedade na qual a revolução tecnológica faz nascer um novo tempo e onde os valores são questionáveis, onde tudo é relativo. E seguindo esta linha de pensamento questionamos a ética na Educação, principalmente no ambiente virtual cibersociedade -, onde as pessoas se relacionam por meios eletrônicos.Nos capítulos II e III, deste estudo se buscou analisar sobre juventude tecnologia e educação. Como esse jovem do ensino médio utiliza as TICs, o desafio da escola com esse recurso educativo, orientando e qualificando essa geração para enfrentarem o mundo cada vez mais interligado. A sala de aula perde a exclusividade, ganhando uma nova dimensão. Quem ensina não pode se neutralizar diante da forte influência lançada pelas tecnologias. O currículo e a formação docente nos faz repensar paradigmas. A educação requer políticas publicas, de formação docente, capacitando para o uso das tecnologias da informação e comunicação TICs, entretanto, não bastam oficinas e sim formação continuada, pois não adianta sofisticar a técnica se o professor não estiver sofisticado na alma, nos fundamentos, e não souber o que desejam os seus alunos. O estudo foi realizado com pesquisa de campo, duas escolas da zona Oeste do Estado do Rio de Janeiro, com entrevistas e questionários para 220 alunos.

Sistemas inteligentes aplicados à coordenação da proteção de sistemas elétricos industriais com relés digitais.

Atualmente existem diferentes ferramentas computacionais para auxílio nos estudos de coordenação da proteção, que permitem traçar as curvas dos relés, de acordo com os parâmetros escolhidos pelos projetistas. Entretanto, o processo de escolha das curvas consideradas aceitáveis, com um elevado número de possibilidades e variáveis envolvidas, além de complexo, requer simplificações e iterações do tipo tentativa e erro. Neste processo, são fatores fundamentais tanto a experiência e o conhecimento do especialista, quanto um árduo trabalho, sendo que a coordenação da proteção é qualificada pela IEEE Std. 242 como sendo mais uma arte do que uma ciência. Este trabalho apresenta o desenvolvimento de um algoritmo genético e de um algoritmo inspirado em otimização por colônia de formigas, para automatizar e otimizar a coordenação da função de sobrecorrente de fase de relés digitais microprocessados (IEDs), em subestações industriais. Seis estudos de caso, obtidos a partir de um modelo de banco de dados, baseado em um sistema elétrico industrial real, são avaliados. Os algoritmos desenvolvidos geraram, em todos os estudos de caso, curvas coordenadas, atendendo a todas as restrições previamente estabelecidas e as diferenças temporais de atuação dos relés, no valor de corrente de curto circuito trifásica, apresentaram-se muito próximas do estabelecido como ótimo. As ferramentas desenvolvidas demonstraram potencialidade quando aplicadas nos estudos de coordenação da proteção, tendo resultados positivos na melhoria da segurança das instalações, das pessoas, da continuidade do processo e do impedimento de emissões prejudiciais ao meio ambiente.

Ramp oxide termination structure using high-k dielectrics for high voltage diamond Schottky diodes

The promising theoretical properties of diamond, together with the recent advances in producing high-quality single crystal diamond substrates, have increased the interest in using diamond in power electronic devices. This paper presents numerical and experimental off-state results for a diamond Schottky barrier diode (SBD), one of most studied unipolar devices in diamond. Finding a suitable termination structure is an essential step towards designing a high voltage diamond device. The ramp oxide structure shows very encouraging electronic performance when used to terminate diamond SBDs. High-k dielectrics are also considered in order to further improve the reliability and electrical performance of the structure. © 2007 Elsevier B.V. All rights reserved.

Efficient carbon nanotube field emitter using electrospun carbon nanofibers as a flexible electrode

Thermal-stable, conductive, and flexible carbon fabric (CF), which is composed of thin carbon fibers prepared by electrospinning, was used for the substrate of carbon nanotube (CNT) field emitter arrays. The field emitter arrays were prepared by chemical vapor deposition (CVD). The current density-electric field characteristics revealed that the CNT field emitter arrays on CF produced a higher current density at a lower turn-on voltage compared to ones on a Si substrate. This emitter integrated with a gate electrode based on hierarchy-structured carbon materials, CNTs on CF, can be used for light sources, displays, and other electronic devices. © 2009 Materials Research Society.

Unexpected controllable pair-structure in ferroelectric nanodomains.

The imminent inability of silicon-based memory devices to satisfy Moore's Law is approaching rapidly. Controllable nanodomains of ferroic systems are anticipated to enable future high-density nonvolatile memory and novel electronic devices. We find via piezoresponse force microscopy (PFM) studies on lead zirconate titanate (PZT) films an unexpected nanostructuring of ferroelectric-ferroelastic domains. These consist of c-nanodomains within a-nanodomains in proximity to a-nanodomains within c-domains. These structures are created and annihilated as pairs, controllably. We treat these as a new kind of vertex-antivertex pair and consider them in terms of the Srolovitz-Scott 4-state Potts model, which results in pairwise domain vertex instabilities that resemble the vortex-antivortex mechanism in ferromagnetism, as well as dislocation pairs (or disclination pairs) that are well-known in nematic liquid crystals. Finally, we show that these nanopairs can be scaled up to form arrays that are engineered at will, paving the way toward facilitating them to real technologies.

Deposition of diamond-like carbon films by photon-enhanced chemical vapour deposition of methane using a windowless hydrogen lamp

Thin films of diamond-like carbon (DLC) have been deposited using a novel photon-enhanced chemical vapour deposition (photo-CVD) method. This low energy method may be a way to produce better interfaces in electronic devices by reducing damage due to ion bombardment. Methane requires high energy photons for photolysis to take place and these are not transmitted in most photo-CVD methods owing to the presence of a window between the lamp and the deposition environment. In our photo-CVD system there is no window and all the high energy photons are transmitted into the reaction gas. Initial work has proved promising and this paper presents recent results. Films have been characterized by measuring electron energy loss spectra, by ellipsometry and by fabricating and testing diode structures. Results indicate that the films are of a largely amorphous nature and are semiconducting. Diode structures have on/off current ratios of up to 106.

Compositional analysis of thin film amorphous semiconductors and insulators using LIMA

LIMA (Laser-induced Ion Mass Analysis) is a new technique capable of compositional analysis of thin films and surface regions. Under UHV conditions a focused laser beam evaporates and ionizes a microvolume of specimen material from which a mass spectrum is obtained. LIMA has been used to examine a range of thin film materials with applications in electronic devices. The neutral photon probe avoids charging problems, and low conductivity materials are examined without prior metallization. Analyses of insulating silicon oxides, nitrides, and oxynitrides confirm estimates of composition from infrared measurements. However, the hydrogen content of hydrogenated amorphous silicon (a-Si : H) found by LIMA shows no correlation with values given by infrared absorption analysis. Explanations are proposed and discussed. © 1985.

Imbibition dynamics of nano-particulate ink-jet drops on micro-porous media

Ink-jet printing of nano-metallic colloidal fluids on to porous media such as coated papers has become a viable method to produce conductive tracks for low-cost, disposable printed electronic devices. However, the formation of well-defined and functional tracks on an absorbing surface is controlled by the drop imbibition dynamics in addition to the well-studied post-impact drop spreading behavior. This study represents the first investigation of the real-time imbibition of ink-jet deposited nano-Cu colloid drops on to coated paper substrates. In addition, the same ink was deposited on to a non-porous polymer surface as a control substrate. By using high-speed video imaging to capture the deposition of ink-jet drops, the time-scales of drop spreading and imbibition were quantified and compared with model predictions. The influences of the coating pore size on the bulk absorption rate and nano-Cu particle distribution have also been studied.

Designing inclusive interfaces through user modeling and simulation

Elderly and disabled people can be hugely benefited through the advancement of modern electronic devices, as those can help them to engage more fully with the world. However, existing design practices often isolate elderly or disabled users by considering them as users with special needs. This article presents a simulator that can reflect problems faced by elderly and disabled users while they use computer, television, and similar electronic devices. The simulator embodies both the internal state of an application and the perceptual, cognitive, and motor processes of its user. It can help interface designers to understand, visualize, and measure the effect of impairment on interaction with an interface. Initially a brief survey of different user modeling techniques is presented, and then the existing models are classified into different categories. In the context of existing modeling approaches the work on user modeling is presented for people with a wide range of abilities. A few applications of the simulator, which shows the predictions are accurate enough to make design choices and point out the implication and limitations of the work, are also discussed. © 2012 Copyright Taylor and Francis Group, LLC.

Nanowires for energy generation

As a result of their morphology, nanowires bring new properties and the promise of performance for a range of electronic devices. This review looks into the properties of nanowires and the multiple ways in which they have been exploited for energy generation, from photovoltaics to piezoelectric generators. © 2012 IOP Publishing Ltd.

Ultralow surface recombination velocity in InP nanowires probed by terahertz spectroscopy.

Using transient terahertz photoconductivity measurements, we have made noncontact, room temperature measurements of the ultrafast charge carrier dynamics in InP nanowires. InP nanowires exhibited a very long photoconductivity lifetime of over 1 ns, and carrier lifetimes were remarkably insensitive to surface states despite the large nanowire surface area-to-volume ratio. An exceptionally low surface recombination velocity (170 cm/s) was recorded at room temperature. These results suggest that InP nanowires are prime candidates for optoelectronic devices, particularly photovoltaic devices, without the need for surface passivation. We found that the carrier mobility is not limited by nanowire diameter but is strongly limited by the presence of planar crystallographic defects such as stacking faults in these predominantly wurtzite nanowires. These findings show the great potential of very narrow InP nanowires for electronic devices but indicate that improvements in the crystallographic uniformity of InP nanowires will be critical for future nanowire device engineering.

A survey on technology exposure and range of abilities of elderly and disabled users in India

This paper reports a survey on people with age-related and physical impairments in India. The survey evaluates functional parameters related to human computer interaction and reports subjective attitude and exposure of users towards technology. We found a significant cognitive decline in elderly users while their functional parameters are sufficient to use existing electronic devices. However young disabled users are found to be experienced with computer but could not have access to appropriate assistive devices, which would benefit them. Most users used desktop computers and mobile phone but none used tablet, smartphone or kiosks though they are keen to learn new technologies. Overall we hope that our results will be useful for HCI practitioners in developing countries. © 2013 Springer-Verlag Berlin Heidelberg.