120 research outputs found
High-performance 16-way Ku-band radial power combiner based on the TE01-circular waveguide mode
This work presents a 16-way Ku-band radial power combiner for high power and high frequency
applications, using the very low loss TE01 circular waveguide mode. The accomplished design shows
an excellent performance: the experimental prototype has a return loss better than 30 dB, with a balance
for the amplitudes of ( 0.15 dB) and ( 2.5 ) for the phases, in a 16.7% fractional bandwidth (2 GHz
centered at 12 GHz). For obtaining these outstanding specifications, required, for instance, in highfrequency
amplification or on plasma systems, a rigorous step-by-step procedure is presented. First, a
high-purity mode transducer has been designed, from the TE10 mode in the rectangular waveguide to
the TE01 mode in the circularwaveguide, with very high attenuation (>50 dB) for the other propagating
and evanescent modes in the circularwaveguide. This transducer has been manufactured and measured
in a back-to-back configuration, validating the design process. Second, an E-plane 16-way radial
power divider has been designed, where the power is coupled from the 16 non-reduced-height radial
standardwaveguides into the TE01 circularwaveguide mode, improving the insertion loss response and
removing the usual tapered transformers of previous designs limiting the power handling. Finally, both
the transducer and the divider have been assembled to make the final radial combiner. The prototype
has been carefully manufactured, showing very good agreement between the measurements and the
full-wave simulationsThe authors would like to thank INMEPRE S.A., the diligence
in the manufacturing process. This work was supported
by the Spanish government under Grant (ADDMATE) No.
TEC2016-76070-C3-1/2-R (AEI/FEDER/UE) and the program
of Comunidad de Madrid S2013/ICE-3000 (SPADERADARCM
Who victimizes whom and who defends whom? A multivariate social network analysis of victimization, aggression, and defending in early childhood
The aim of this research was to investigate the interplay between victim-aggressor relationships and defending relationships in early childhood to test the proposition that young aggressors are less selective than older children in their choice of vulnerable targets. Cross-sectional multivariate statistical social network analyses (Exponential Random Graph Models) for a sample of 177 preschoolers from seven classes, 5- to 7-years-old, revealed that boys were more aggressive than girls, towards both boys and girls, whereas defending relationships were most often same-sex. There was significant reciprocity in aggression, indicating that it was more often bidirectional rather than unidirectional. In addition, aggressors clearly defended each other when they shared their targets of aggression, whereas a marginally significant trend appeared for defending between victims who were victimized by the same aggressors. Furthermore, teacher-rated dominance was positively associated with childrenâs involvement in both aggression and victimization, and teacher-rated insecurity was associated with less aggression, but not with victimization. These findings suggest that those who are reported as being victimized may retaliate, or be aggressive themselves, and do not display some of the vulnerabilities reported among older groups of victims. The findings are in line with the proposition that young aggressors are less strategic than older children in targeting vulnerable victims. The network approach to peer victimization and defending contributes to understanding the social processes facilitating the development of aggression in early childhood
Additive Manufacturing of 3D Printed Microwave Passive Components
This chapter presents a comprehensive analysis of the applications of a low-cost version of additive manufacturing (AM). The technique called Fused Filament Fabrication (FFF), which makes use of plastic as raw material, is explained in the context of its applications to the microwave waveguide engineering field. The main advantages of this technology include the promptness to print models, the variety of feasible geometries, and specially the reduced cost. The main limitations are also explained. Two important applications are considered: (1) rapid prototyping of complex devices and (2) manufacturing of fully functional devices. The former is relevant to get a more realistic perspective of the actual geometry in computer-aided designs, as shown in several examples. It also helps to forecast possible issues in the fabrication process that the computer sometimes fails to detect at the design stage. In the latter case (2), the subsequent and necessary metallization of plastic devices is also addressed. Several examples of state-of-the-art passive waveguide devices are presented, including waveguide filters, a diplexer, a branch-line coupler, a load or horn antennas, which have been printed, metallized, and measured. The results show the potential of three-dimensional (3D) printing and provide a different insight into this innovative technology
Appendicoumbilical fistula, a cause of an umbilical mass with drainage
Reporte de un caso de una fĂstula apendico-umbilical
ExperiĂȘncias de contacto dos bebĂ©s com a linguagem escrita
The purpose of this study is to characterize the literacy experiences ofbabies aged between 14 and 24 months. In this study, four issues were analysed: which type of written language experiences are offered to the children, how parents value these literacy experiences, the way parents perceive their own role in the literacy development of their children and what parents know about their means of contributing to the literacy development of their children. Six mothers were interviewed. These interviews were analysed with the use of a categorical content analysis. The results suggest that mothers value and include in their practices facilitative and mediation actions of literacy experiences with their children, noting some variability depending on the respective qualifications.Este estudo exploratĂłrio visa descrever as experiĂȘncias de literacia de bebĂ©s entre os 14 e os 25 meses. Analisamse quatro questĂ”es, que experiĂȘncias envolvendo a linguagem escrita no seio familiar sĂŁo proporcionadas aos bebĂ©s, qual o valor que os pais lhes atribuem, como percepcionam o seu papel na promoção do desenvolvimento literĂĄcito dos filhos e como podem contribuir para o desenvolvimento da literacia dos mesmos. Adotou-se uma metodologia qualitativa, com recurso Ă anĂĄlise de conteĂșdo categorial das respostas dadas por seis mĂŁes em entrevista individual e semiestruturada. Concluiu-se que estas mĂŁes valorizam e incluem nas suas prĂĄticas açÔes facilitadoras e de mediação de experiĂȘncias de literacia por parte dos seus bebĂ©s, notando-se alguma variabilidade em função das respetivas habilitaçÔes acadĂ©micas.(undefined)info:eu-repo/semantics/publishedVersio
Curriculum in early childhood education: critical questions about content, coherence, and control
A continuing struggle over curriculum in early childhood education is evident in contemporary research and debate at national and international levels. This reflects the dominant influence of developmental psychology in international discourses, and in policy frameworks that determine approaches to curriculum, pedagogy, and assessment. Focusing on early childhood education, we argue that this struggle generates critical questions about three significant themes within curriculum theory: content, coherence, and control. We outline two positions from which these themes can be understood: Developmental and Educational Psychology and contemporary policy frameworks. We argue that within and between these positions, curriculum content, coherence, and control are viewed in different and sometimes oppositional ways. Following this analysis, we propose that a focus on âworking theoriesâ as a third position offers possibilities for addressing some of these continuing struggles, by exploring different implications for how content, coherence, and control might be understood. We conclude that asking critical questions of curriculum in early childhood education is a necessary endeavour to develop alternative theoretical frameworks for understanding the ways in which curriculum can be considered alongside pedagogy, assessment, play, and learning
The management of acute venous thromboembolism in clinical practice. Results from the European PREFER in VTE Registry
Venous thromboembolism (VTE) is a significant cause of morbidity and mortality in Europe. Data from real-world registries are necessary, as clinical trials do not represent the full spectrum of VTE patients seen in clinical practice. We aimed to document the epidemiology, management and outcomes of VTE using data from a large, observational database. PREFER in VTE was an international, non-interventional disease registry conducted between January 2013 and July 2015 in primary and secondary care across seven European countries. Consecutive patients with acute VTE were documented and followed up over 12 months. PREFER in VTE included 3,455 patients with a mean age of 60.8 ± 17.0 years. Overall, 53.0 % were male. The majority of patients were assessed in the hospital setting as inpatients or outpatients (78.5 %). The diagnosis was deep-vein thrombosis (DVT) in 59.5 % and pulmonary embolism (PE) in 40.5 %. The most common comorbidities were the various types of cardiovascular disease (excluding hypertension; 45.5 %), hypertension (42.3 %) and dyslipidaemia (21.1 %). Following the index VTE, a large proportion of patients received initial therapy with heparin (73.2 %), almost half received a vitamin K antagonist (48.7 %) and nearly a quarter received a DOAC (24.5 %). Almost a quarter of all presentations were for recurrent VTE, with >80 % of previous episodes having occurred more than 12 months prior to baseline. In conclusion, PREFER in VTE has provided contemporary insights into VTE patients and their real-world management, including their baseline characteristics, risk factors, disease history, symptoms and signs, initial therapy and outcomes
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