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[pt] Esta dissertação resulta do estudo que se propôs a desvendar as conformações do trabalho do assistente social na contemporaneidade, bem como os aspectos que o inter-relacionam. Constitui-se na pesquisa sobre a produção acadêmica retratada em teses e dissertações no âmbito de programas de pós-graduação, da área de Serviço Social, situados no estado do Rio de Janeiro. Teve como escopo a análise de 24 dissertações e 5 (cinco) teses defendidas no período de 2012 a 2016 junto aos programas de pós-graduação stricto sensu em Serviço Social vinculados a importantes universidades do estado do Rio de Janeiro, a saber: PUC-Rio, UFF, UFRJ e UERJ. Trata-se, portanto, de pesquisa bibliográfica que, apoiando-se na teoria social marxista, busca estabelecer um panorama sobre as condições e relações de trabalho, bem como sobre os desafios que se impõem aos trabalhadores assistentes sociais no contexto atual. Com base em revisão bibliográfica sobre o assunto e diante das análises levantadas no processo da investigação, assevera que os assistentes sociais são também trabalhadores partícipes do processo de produção e reprodução da vida social. Buscou caracterizar o estado da arte acerca do debate sobre o trabalho do assistente social contido nas teses e dissertações produzidas nos cinco anos destacados, na área do Serviço Social. Nessa medida, apresenta um retrato da realidade atual em que se inserem os trabalhadores assistentes sociais a partir da análise das produções acadêmicas que se constituíram objeto de pesquisa. / [en] The present dissertation results from a research that proposed to unravel the conformations of the work of the social worker in the contemporaneity, as well as some aspects that interrelate their work, through research on the academic production in theses and dissertations in the scope of post-graduation programs in the Social Work area, located in the state of Rio de Janeiro, Brazil. The analysis include 24 dissertations and 5 (five) from 2012 to 2016, and some strict sense post-graduation courses in Social Service linked to important universities in the state of Rio de Janeiro (PUC-Rio, UFF, UFRJ and UERJ). It is therefore a bibliographical research that is based on Marxist social theory and seeks to establish a panorama on the conditions and labor relations, as well as on the challenges that are placed on social workers in the current context. Based on a bibliographical review on the subject and the analysis made in the research process, it asserts that social workers are also workers who participate in the process of production and reproduction of social life. It sought to characterize the state of the art about the debate about the work of the social worker contained in the theses and dissertations produced in the five years highlighted, in the area of the Social Work. To this extent, it presents a picture of the current reality in which the social workers are inserted, based on the analysis of the academic productions that were constituted object of research.

The aim of this study is to understand how super-mobility affects EMJM students’ experiences. This is done through exploring the experiences of Euroculture students, by answering the following research question: Are there differences to find between the reflections on the experiences of Euroculture mobile and super-mobile students, in terms of Mobility Perception, Competences, and Perspective on the Future? In order to answer the research question, in-depth interviews are conducted. For the analysis, the author applies three concepts, one taken from the methodology for developing the European Higher Education Area, and two that she proposes based on the existing literature on super-mobility in education. The results show that there are significant differences in how students within the same programme get to experience it in relation to the mobility component. They also show both the positive and the more problematic effects of super-mobility on the students’ development in several dimensions.

When laying up dry composite materials and aligning the fibers in the appropriate directions it can be a challenge due to the dryness of the fiber and mold design. Several commercial products are available to help fix plies to molds keeping the proper fiber orientation depending upon mold geometry. Prepreg and wet layups do not have this problem due to the inherent inclusion of a matrix in their manufacturing, dry materials have no added epoxy at the time of layup and are therefore in need of assistance maintain position. The purpose of this research is to determine if Super 77™ or EPON™ 2002 increases or decreases mechanical properties of the neat resin and composite laminates; if the increase or decrease is dependent upon the type of epoxy, and if the amount of applied tackifier can be optimized towards a high or low application quantity to minimize any detrimental effects to mechanical properties. Each tackification agent was applied in high and low concentrations to eight composite panels, with two control panels. The EPON™ was applied manually and set with heat exposure while the Super 77™ was sprayed from an aerosol can. The Super 77™ plies were stacked and pressed by hand while the EPON™ plies were stacked and ironed together to create panels, which were then infused with one of two room temperature infusion epoxies, MVS 610 or INF 114. The panels were then cut to specimen size for testing. Neat resin specimens were cast in silicone molds with high and low concentrations of tackifiers and allowed to cure for 12 hours at room temp, then heated to 60° C for 8 Both Super 77™ and EPON™ 2002 reduced the SBS for both epoxies, but Super 77™ reduced the short beam shear more than EPON™ 2002. The modulus of the neat resin cast specimens with high concentration were between 0 to 20% lower than neat resin with no tackifier; the tensile strength was increased for those specimens with Super 77™ and lower for those with EPON™ 2002. Similarly, the Charpy test resulted in higher values for Super 77™ than for EPON™ 2002. The effects of Super 77™ and EPON™ 2002 are complex and varied depending on application concentration, resin, and tackifier type; but the addition of any tackifier reduces mechanical properties from non-tackified laminates.

Today’s world is becoming increasingly automated and interconnected with billions of smart devices coming online, leading to a steep rise in energy consumption from small microelectronics. This coincides with an urgent push to transform global energy production to green energies, causing disruptions and energy shortages, and making the case for efficient energy use ever more pressing. Two major areas where high growth is expected are the fields of wireless communication and radar sensors. Millimeter-wave frequency bands are planned for fifth-generation (5G) and sixth-generation (6G) cellular communication standards, as well as automotive frequency-modulated continuous wave (FMCW) radar systems for driving assistance and automation. Fast silicon-based technologies enable these advances by operating at high maximum frequencies, such as the silicon-germanium (SiGe) heterojunction bipolar transistor (HBT) technologies. However, even the fastest transistors suffer from low and energy expensive gains at millimeter-wave frequencies. Rather than incremental improvements in circuit efficiency using conventional approaches, a disruptive revolution for green microelectronics could be enabled by exploring the low-power benefits of the super-regenerative receiver for some applications. The super-regenerative receiver uses a regenerative oscillator circuit to increase the gain by positive feedback, through coupling energy from the output back into the input. Careful bias and control of the circuit enables a very large gain from a small number of transistors and a very low energy dissipation. Thus, the super-regenerative oscillator could be used to replace amplifier circuits in high data rate wireless communication systems, or as active reflectors to increase the range of FMCW radar systems, greatly reducing the power consumption. The work in this thesis presents fundamental scientific research into the topic of energy-efficient millimeter-wave super-regenerative receivers for use in civilian wireless communication and radar applications. This research work covers the theory, analysis, and simulations, all the way up to the proof of concept, hardware realization, and experimental characterization. Analysis and modeling of regenerative oscillator circuits is presented and used to improve the understanding of the circuit operation, as well as design goals according to the specific application needs. Integrated circuits are investigated and characterized as a proof of concept for a high data rate wireless communication system operating between 140–220 GHz, and an automotive radar system operating at 60 GHz. Amplitude and phase regeneration capabilities for complex modulation are investigated, and principles for spectrum characterization are derived. The circuits are designed and fabricated in a 130 nm SiGe HBT technology, combining bipolar and complementary metal-oxide semiconductor (BiCMOS) transistors. To prove the feasibility of the research concepts, the work achieves a wireless communication link at 16 Gbit/s over 20 cm distance with quadrature amplitude modulation (QAM), which is a world record for the highest data rate ever reported in super-regenerative circuits. This was powered by a super-regenerative oscillator circuit operating at 180 GHz and providing 58 dB of gain. Energy efficiency is also considerably high, drawing 8.8 mW of dc power consumption, which corresponds to a highly efficient 0.6 pJ/bit. Packaging and module integration innovations were implemented for the system experiments, and additional broadband circuits were investigated to generate custom quench waveforms to further enhance the data rate. For radar active reflectors, a regenerative gain of 80 dB is achieved at 60 GHz from a single circuit, which is the best in its frequency range, despite a low dc power consumption of 25 mW.