Abstract This paper describes the development of a double-sided band-pass frequency selective surface based on Matryoshka geometry, preserving features such as miniaturization, multiband operation and stability of polarization and angle of incidence. Unlike cascaded FSSs, the proposal uses only one layer of substrate, with Matryoshka geometry on one side and a square mesh on the other, reducing volume and simplifying manufacturing by avoiding spacers. The double-sided FSS allows the frequency response to be adjusted using the geometry of the opposite face, which in this work is a square loop. With an attenuation of -10 dB, the proposed configuration offers a free band from 3.48 GHz to 9.06 GHz, compared to the original configuration, which ranged from 5.88 GHz to 7.43 GHz, with only 1.55 GHz free. Initial design equations are presented which facilitate the creation of FSSs for other frequencies and applications. An FSS has been designed, fabricated, and characterized, with good agreement between numerical and experimental results. The resonant frequency remains practically constant for different incidence angles, from 0º to 60º, confirming the angular stability. doublesided double sided bandpass pass miniaturization substrate spacers face loop 10 -1 dB 348 3 48 3.4 906 9 06 9.0 588 5 88 5.8 743 7 43 7.4 155 1 55 1.5 applications designed fabricated characterized results angles º 60º - 34 4 3. 90 0 9. 58 8 5. 74 7. 15 1.

Foi avaliada a composição química e percentual de adequação das dietas coletadas por meio da porção em duplicata de 36 servidores do Instituto Nacional de Pesquisas da Amazônia (INPA). De acordo com os resultados obtidos, verificou-se uma diversificação de alimentos frequentemente consumidos, dentre eles: açúcar (91,7%), arroz (80,6%), café (77,8%), leite (72,3%), carne bovina e pão (63,9%), farinha de mandioca (58,4%), batata inglesa (55,6%), feijão (50,04%), aves (38,9%), banana, cenoura e embutidos (33,4%), ovo, refrigerantes e tomate (30,6%). Considerando as recomendações nutricionais para a faixa etária de 25 a 50 anos, as adequações calóricas foram 40% e 52,7% para homens e mulheres respectivamente, protéica 76,4% (homens) e 96,3% (mulheres). Os minerais Ca, Mg e Zn (homens) apresentaram adequação inferior a 50%, enquanto que o Fe apresentou adequação de 89,1% (homens) e 59.4% (mulheres). Os minerais Na, Cu, Cl, Cr e I apresentaram valores acima do recomendado em ambos os sexos. Apesar da grande variedade de alimentos ingeridos por esta população, verificou-se valores limitantes para a maioria dos nutrientes, independentemente do sexo. Mesmo pertencendo a um nível sócio-cultural mais privilegiado, fica patente a importância da orientação alimentar a esse grupo populacional, pois é um dos pontos principais no que concerne as condições de saúde e nutrição da população.

The chemical composition of the duplicate food collections obtained from 36 servers of the National Institute of Researches of Amazônia (INPA) was evaluated and as percentage of recommended intake. The most frequently food consumed they were: sugar (91.7%), rice (80.6%), coffee (77.8%), milk (72.3%), bovine meat and bread (63.9%), cassava flour (58.4%), potato (55.6%), bean (50.0%), birds (38.9%), banana, carrot and sausages (33.4%), egg, sodas and tomato (30.6%). The results obtained showed the caloric deficiency of 40% and 52,7% respectively for adult men and adult women (25 to 50 years), protein of 76,4% (men) and 96,3% (women). The minerals Ca, Mg and Zn (men) were deficient whit an adequacy of about 50%. When compared with the recommended intakes, Fe was deficient for the adult women (59.4%). The minerals Na, Cu, Cl, Cr and I values were very high. Although of the great variety of foods ingested by this population, it was verified values are near the lowest limited set by RDA for most of the nutrients. Same belonging at a more privileged socio-economic living conditions, it is patent the importance of the alimentary orientation to that population group, because it is one of the main points in what it concerns the conditions of health and nutrition of the population.