Plasmon polaritons in photonic superlattices containing a left-handed material

We analyze one-dimensional photonic superlattices which alternate layers of air and a left-handed material. We assume Drude-type dispersive responses for the dielectric permittivity and magnetic permeability of the left-handed material. Maxwell's equations and the transfer-matrix technique are used to derive the dispersion relation for the propagation of obliquely incident optical fields. The photonic dispersion indicates that the growth-direction component of the electric (or magnetic) field leads to the propagation of electric (or magnetic) plasmon polaritons, for either TE or TM configurations. Furthermore, we show that if the plasma frequency is chosen within the photonic $=0$ zeroth-order bandgap, the coupling of light with plasmons weakens considerably. As light propagation is forbidden in that particular frequency region, the plasmon-polariton mode reduces to a pure plasmon mode.Comment: 4 pages, 4 figure

Plasmon polaritons in photonic metamaterial superlattices : absorption effects

ABSTRACT: We discuss the propagation of electromagnetic waves in layered structures made up of alternate layers of air and metamaterials. The role played by absorption on the existence of electric and magnetic plasmon polaritons is investigated. Results show that plasmon-polariton modes are robust even in the presence of rather large absorption

Recomendação de cultivares de milho para zona agreste do nordeste brasileiro: ensaios realizados no ano agrícola de 2006.

bitstream/CPATC/19581/1/cot-66.pdfISSN 1678-1937

Factors associated with inflamm-aging in institutionalized older people

The increase in inflammatory cytokines associated with a reduction in the bioavailability of zinc has been used as a marker for inflammation. Despite the high inflammatory state found in institutionalized older individuals, few studies have proposed verifying the factors associated with this condition in this population. To verify the factors associated with inflamm-aging in institutionalized older people. A total of 178 older people (≥ 60 years old) living in nursing homes in Natal/RN were included in the study. Cluster analysis was used to identify three groups according to their inflammatory state. Analysis anthropometric, biochemical, sociodemographic, and health-related variables was carried out. In sequence, an ordinal logistic regression was performed for a confidence level of 95% in those variables with p < 0.20 in the bivariate analysis. IL-6, TNF-α, zinc, low-density lipids (LDL), high-density lipids (HDL), and triglycerides were associated with inflamm-aging. The increase of 1 unit of measurement of LDL, HDL, and triglycerides increased the chance of inflammation-aging by 1.5%, 4.1%, and 0.9%, respectively, while the oldest old (≥ 80 years old) had an 84.9% chance of presenting inflamm-aging in relation to non-long-lived older people (< 80 years). The association between biochemical markers and inflamm-aging demonstrates a relationship between endothelial injury and the inflammatory state. In addition, the presence of a greater amount of fat in the blood may present a higher relative risk of death

Diversidade genética de fusarium spp. associado à fusariose do maracujazeiro no Estado da Bahia por meio de marcadores SSR.

O Brasil é o maior produtor mundial de maracujá amarelo (Passiflora edulis Sims f. flavicarpa Deg.) e o Estado da Bahia lidera a produção da fruta. A fusariose, incitada por Fusarium oxysporum f. sp. passiflorae (FO) e F. solani (FS), causa murcha e podridão de raízes, respectivamente, entre outros sintomas, e é um dos principais fatores responsáveis pelo baixo rendimento dos municípios baianos

Recomendação de híbridos de milho para o nordeste brasileiro: ensaios realizados no ano agrícola de 2005/2006.

bitstream/CPAMN-2010/23772/1/cot-65.pd