Perspectives of biological control of leafminers in tomato crops.

The present talk will discuss the possibilities of these biological control tactics to be inserted in tomato crops IPM

Registro de introduções de plantas de cultura pré-colombiana coletadas na Amazônia brasileira.

Registro de introduções do material coletado nas viagens realizadas de 1984 a 1988. Principais características das plantas matrizes: timbó, dao, acai, tucuma, cupuaçu, biriba, condessa, graviola, araticum, palmeiras do gênero oenocarpus, pupunha, urucu, taperebá, cutite, cajarana, cacau, plantas medicinais, boldo.bitstream/item/63464/1/CPATU-Doc58.pd

Optics and pool : play the game

In this communication we will present an experimental work to be carried out by students, from even the early ages of basic school, in a non-formal environment. Using a pool table (a game well known to many students) students will perform a series of experiments learning and demonstrating the laws of light reflection. The idea of associating the use of a pool table to the teaching of geometric optics is based on the need to make the teaching process more appealing on behalf of the students. Being pool a popular and appealing game it would be possible to teach physics concepts in an apparently informal or non-formal context. This assembly is also simplified due to the fact that only day-to-day materials are used, reducing its final cost as we only need to perform a few reversible changes to a pool table

Coleta de plantas de cultura pré-colombiana na Amazônia brasileira.

pt. I: Metodologia de expedições realizadas para coleta de germoplasma: pr. 2: Trabalhos realizados na sede da Embrapa Amazônia Oriental.bitstream/item/63980/1/CPATU-Doc99.pdf; bitstream/item/61632/1/CPATU-Doc107.pd

Dielectric lens antennas

Dielectric lens antennas are attracting a renewed interest for millimeter- and submillimeter-wave applications where they become compact, especially for configurations with integrated feeds usually referred as integrated lens antennas. Lenses are very flexible and simple to design and fabricate, being a reliable alternative at these frequencies to reflector antennas. Lens target output can range from a simple collimated beam (increasing the feed directivity) to more complex multi-objective specifications. This chapter presents a review of different types of dielectric lens antennas and lens design methods. Representative lens antenna design examples are described in detail, with emphasis on homogeneous integrated lenses. A review of the different lens analysis methods is performed, followed by the discussion of relevant lens antenna implementation issues like feeding options, dielectric material characteristics, fabrication methods, and a few dedicated measurement techniques. The chapter ends with a detailed presentation of some recent application examples involving dielectric lens antennas

Wideband and high-selectivity dual-band filter for Ka-Band satellite antennas

A dual-band miniaturized Ka-band filter is presented, taking advantage of transmission in cut-off rectangular waveguides periodically loaded in the E-plane with Split-Ring Resonators (SRRs). High selectivity, wide bandwidth and high out-of-band rejection are achieved in a compact form factor. The use of SRRs in a waveguide configuration proves to be a valid and promising solution for the design of dual-band filters. The filter is specifically designed for Ka-band and a prototype was manufactured and its performance measured, providing a reasonably flat transmission at both 20 and 30 GHz sub-bands. For both bands the power roll-off rate is higher than 55 dB/decade, translating into a sharper than 10 dB drop per 0.2 GHz in a 38 × 6.6 × 4.5 mm3 device. The filter half-power bandwidth is B_20 = 1.1 GHz at 20 GHz (18.4 - 19.5 GHz) and B_30 = 1.2 GHz at 30 GHz (27.8 - 29.0 GHz).info:eu-repo/semantics/acceptedVersio

Perspectives of Liriomyza biological control in Brazil.

In this work the results of a ten - year research on Liriomyza parasitoids in Brazil are reported

Relações hipsométricas para plantios adensados de castanheira-do-brasil (Bertholletia excelsa) na Amazônia Central.

Neste trabalho, foram ajustadas 23 equações matemáticas com o objetivo de selecionar a que melhor descreva a relação hipsométrica em plantios adensados de castanheira