The Internet of Things (IoT) promotes interconnectivity between devices and these keep appearing in larger quantities throughout the years, with the evolution of communication technologies. However, scalability comes with a price, since for a higher quantity of devices comes the need for better transmission channels, with higher reach, availability and improved security capabilities. The infrastructure that comes with this ubiquitous network is very expensive so there is a need for finding low-cost solutions for the transmission of data, benefiting from the qualities of the optical fibers.Wireless technologies already provide a way to solve these issues, but the use of optical fibers would give to the IoT their own unique features, such as high bandwidth, long reach, signal integrity and high security. But IoT devices should not be power hungry nor have very limiting electrical-to-optical conversions, so a passive optical communications module based of fiber Bragg gratings for long reach and for the upload of information with low data rates should be implemented. This module would be integrated in the IoT ecosystem by connecting it to the existent dark fibers all over the world.A simulator of this module was implemented, capable of reproducing its characteristics for the transmission of information modulated in Frequency-Shift Keying and On-Off Keying modulation schemes. The study of the system performance for these schemes was made by estimating the Bit Error Rate using the Error Vector Magnitude metric, in relation to the received optical power.

Developments on code-compliant Topology Optimisation methodologies for the steel construction industry have recently been proposed. Also, it has been found that topologically optimised steel bolted connection parts – which behave non-linearly to a very significant degree of damage – do not waive physically non-linear analyses to assess an ultimate capacity that can be lower than what is predicted by the optimisation procedure linear analyses. These two circumstances brought urgency to the experimental testing of such optimised parts. The herein depicted experimental programme assessed topologically optimised and previously numerically analysed bolted parts of a well-known steel connection. The results allowed redefining the material trilinear model to be used in further numerical analysis and, very significantly, validated the numerical simulations results as well as the application of Eurocode formulae for connections component resistance. The difference between the previous numerically predicted ultimate resistance and the experimentally defined did not exceed 2.6%.

Testing shear-resisting plates in steel connections is one of the most challenging laboratory undertakings in steel construction, as the most common experimental layout design includes simulating the connection with its adjoining members. This significant hindrance gained particular magnitude as the need to test prototypes of topologically optimised shear cover plates became more pressing. Indeed, new code-compliant topology optimisation approaches for steel construction have recently been offered, and physically non-linear analyses have been demonstrated to be vital for assessing these elements. Hence, a rapid and reliable experimental process has become a fundamental necessity. To answer this need, a novel layout is herein proposed, in which topologically optimised and previously numerically examined bolted shear plates of a well-known steel joint were tested. The results allowed for the definition of the material trilinear model for use in subsequent numerical analysis, as well as the validation of the numerical simulation results. The discrepancy between the previously mathematically anticipated and empirically determined ultimate resistance did not exceed 1.7%.

Introduction: Aortocaval Fistula is a rare clinical entity associated with Abdominal Aortic Aneurysm in less than 1% of cases. Main clinical features include acute heart failure, lower extremety edema, acute kidney injury and acute liver failure. Open surgical repair is associated with high mortality rates (16–66%)(1). On the other hand, endovascular treatment could represent a less morbid and equally efective treatment option. The authors aim to describe clinical presentation, surgical options and post-operative results of the treatment of abdominal aortic aneurysms associated with aortocaval fistula, comparing their results to literature. Material and Methods: A retrospective review in a tertiary care center was designed. All patients treated for aortocaval fistula associated with AAA between January of 2014 and May of 2020 were included. Patient data were obtained by consulting the clinical record. Demographic, clinical, surgery and post-operative results and complications were obtained. Results: During this period, four patients submitted to emergent surgery were identified. All patients were male with a mean age of 70 (±8) years and with tobacco use history (n=4). On admission, most frequent symptoms we're lumbar pain (n=4) and hipotension/tachycardia (n=4). Other frequent signs or symptoms we're abdominal pulsatile mass (n=3) and acute kidney injury with hematuria (n=2). In two patients, CT angiography revealed rAAA with retroperitoneal hematoma without aortocaval fistula, which was only diagnosed intraoperatively. Two patients were submitted to aorto-bi-iliac interposition graft and one to aorto-bi-femoral bypass, all with endoaneurysmal suture of the fistula. One patient was submitted to aorto-bi-iliac EVAR with a Gore Excluder C3® endoprosthesis. Most common post-operative complications were AKI (n=3), respiratory failure (n=2) and acute liver failure (n=2). The aorto-bi-iliac EVAR patient did not present any 30 day post-operative complication and was discharged at the 7th post-operative day. There was 1 secondary intervention within the first 30 days: left hemicolectomy for ischemic colitis. After 30 days we observed one reintervention: implantation of right iliac branch device due to an iliac aneurysm Two patients died in the early postoperative period (2nd and 3rd days). The remaining patients have a follow-up of 29 and 66 months. Conclusions: ACF can occur with or without AAA with retroperitoneal hematoma. In the presence of retroperitoneal hematoma, the ACF could not be evident in CT angiography and only detected intraoperatively. Considering our experience and what is described in literature, we should have a high index of suspicion for this possible complication of rAAA in the presence of acute venous congestion with acute onset of organ failure (AKI, acute cardiac or liver failure), even if CT angiography only reveals retroperitoneal hematoma. Conventional surgery with endoaneurysmal suture of the fistula and interposition graft was the preferred technique, but if endovascular exclusion is feasible, it could be effective and associated with less morbimortality. In endovascular treatment, failure to close aortocaval communication does not appear to result in higher long-term morbidity and monitoring seems plausible in the presence of favorable evolution of the aneurysmal sac and in the absence of symptoms.

Introduction: Nellix® endoprosthesis (Endologix Inc., Irvine, CA) is composed by two ballon-expandable stents surrounded by endobags, which are filled with a polymer, thus obliterating the aneurysmal sac – Endovascular Aneurysm Sealing (EVAS). Initially, due to its properties, was introduced with extended IFU, allowing the use in more complex abdominal aortic aneurysms. However, during the initial experience with this endoprosthesis, a high number of poor outcomes have been described, leading to the progressive restriction of IFU. Currently, it has been discontinued and is only available in selected centers for clinical research purposes. Our study aim to report the institutional results of the use of the Nellix® endoprosthesis in the treatment of AAA. Material and Methods: A retrospective study was designed, including patients with AAA treated with Nellix® endoprosthesis treated at a universitary tertiary care facility. Elective and urgent patients we're included, and patients we're identified through the institutional files. Thoraco-abdominal aneurysm we're excluded. Data about baseline characteristics, surgery, hospitalization course and follow-up post discharge was obtained by consulting personal clinical files. Primary endpoints are technical and clinical success at 30 days, as complications and secondary interventions at mid and long-term. Results: Between 2015 and 2017, this endoprosthesis was used in 12 patients, 9 male and 3 female, with a mean age of 71 (±8) years. The most common comorbidities associated we're hypertension (n=12), current or former tobacco use (n=7), coronary heart disease (n=7), peripheral artery disease (n=6) and chronic kidney disease (n=6) In all patients, the treatment indication was primary degenerative aneurysm, with one exception, which was the presence of type 1a EL after EVAR. Ten patients underwent elective and 2 urgent surgery due to symptomatic aneurysm. Three we're aortoiliac aneurysms and the remaining aortic aneurysms (n=9) with three having involvement of at least one renal artery. Nine patients underwent conventional EVAS; the remaining EVAS with chimney (ChEVAS) for the renal artery(ies) or superior mesenteric artery (n=3). The average preoperative diameter was 57(±6.5) mm. One patient was simultaneously submitted to endovascular repair of a popliteal artery aneurysm with covered stent. By 30 days, death occurred in 2 patients, all submitted to ChEVAS. The most common post-operative complications we're respiratory failure (n=3), AKI with dialysis (n=3), being that in two patients there was intentional covering of the renal arteries (patients with pre-dialysis CKD). In this time frame, we verified one reintervention: catheter-directed thrombolysis for acute limb ischemia due to popliteal covered stent thrombosis. After 30 days, 4 deaths occured (2 year survival 60%, SE 0.154). The most common complications were type 1a EL(n=3), type 1b EL(n=1) and aortic stent thrombosis (n=1). Two patients have already been reintervened: one submitted to femoro-femoral crossover bypass and the other to surgical endoprosthesis explantation and in situ reconstruction aortobifemoral bypass. The last was deceased in the early postoperative period. Two patients are waiting reintervention for type Ia EL and aneurysmal sac growth. The average sac diameter in last follow-up or before secondary intervention was 59(±10.6) mm. Mean follow-up time is 2,3(±1,6) years.  Conclusions: In our institution, the use of Nellix® endoprosthesis is associated with a high rate of perioperative morbidity and mid to long-term aneurysm-related complications, being type Ia EL the most common. Although the free use of the endoprosthesis is currently discontinued, patients who have previously undergone EVAS lack a specific and more intensive surveillance plan for the timely detection and correction of complications.

A 37-year-old female underwent an emergent implant of a covered self-expandable stent graft (8mm x 10cm Viabahn, W. L. Gore) due to acute bleeding from a femoral access following closure of a patent foramen ovale. Over the following months, intermittent claudication developed, progressively more incapacitant. Work-up revealed near-occlusion of the stent graft due to edge stenosis. Elective explant of the stent graft was performed, revealing extensive proximal and distal edge miointimal hyperplasia (marked with *). Endarterectomy was performed and the arterial defect was corrected with a bovine pericardium patch.

O livro Desobediencia epistémica: retórica de la modernidad, lógica de la colonialidad y gramática de la descolonialidad (Desobediência epistêmica: retórica da modernidade, lógica da colonialidade e gramática da descolonialidade) é uma obra do professor e pesquisador argentino Walter Mignolo, publicada em 2010, em Buenos Aires, pela editora Del Signo. O autor começa justificando a pertinência e a origem do livro, concebido a partir de reflexões engendradas no diálogo com alguns pesquisadores em Ciências Sociais, de diversas perspectivas teórico-metodológicas, em reuniões do grupo de modernidade/ colonialidade, nas universidades de Duke e Carolina do Norte, no ano de 2004.

O presente texto tece reflexões acerca da pesquisa narrativa e discute alguns princípios constitutivos em ações investigativas que se inscrevem nessa perspectiva teórico-metodológica. Por meio da partilha de algumas narrativas e acontecimentos vividos no desenvolvimento de uma investigação-formação longitudinal, o trabalho sublinha o quanto as ideias de experiência, alteridade, igualdade e horizontalidade são potentes para pensar e investigar narrativamente os processos formativos docentes. Além disso, destaca o outro como um sujeito legítimo e importante no processo alteritário da pesquisa e da formação, tendo no conceito de excedente de visão uma ferramenta privilegiada para essa reflexão.Palavras-chave: Narrativa. Pesquisa. Formação Docente. Experiência. Alteridade.

Este artigo procura estabelecer um diálogo heurístico entre as lógicas normativas de mercadorização do trabalho e as lógicas normativas de psiquiatrização do sexo. A par­tir de uma incursão crítica por um conjunto de protocolos morais e periciais que servem a descrição e a regulação do trabalho e da sexualidade, este ensaio tem por objectivo contribuir para sinalizar velhas e novas articulações entre desvio, normalidade e sen­tido. Apoiando-se em modos específicos de produção de verdade e de justiça, a merca­dorização do trabalho e a psiquiatrização do sexo revelam uma afinidade epistémico­-funcional no governo jurídico do sujeito que interpela as bases culturais do direito como fenómeno social.