Temperature, strain and charge mediated multiple and dynamical phase changes of selenium and tellurium

Trigonal-Se and -Te change to a metallic or a simple cubic structure under thermal excitation, compressive strain and excess positive charge, or to metallic, body-centered tetragonal and body-centered orthorhombic structures under negative charging.

The Reentrant Four-Layer Quasi-Elliptic Bandstop Filter

The novel microwave quasi-elliptic bandstop filter, which uses the initially uncoupled strip transmission lines, is considered in this work. The proposed filter is based on the reentrant structure, where the metallic body with a floating potential is asymmetric. Generally speaking, the internal and external dielectric fillings must have their unequal relative permittivities. As a result, additional symmetrical reflection zeros are reached at the lower and upper pass bands of the stop band leading to the quasi-elliptic function response that improves the filter selectivity. The general transverse electromagnetic (TEM) circuit model for the proposed filter in terms of a series connection of the multi-ports is presented and then used to predict the initial electrical and geometrical parameters. An experimental printed circuit prototype has been manufactured and evaluated to validate the design concept. The measured filter parameters correlate well with the simulation-derived ones and that increases the degree of freedom in the fabrication of microwave frequency selective components.

Metallic body foreign language - case report

Probably every laryngologist in his career will face off an issue of foreign body removal. It can be problematic especially that foreign body cause the trauma of surrounding tissues or may translocate unpredictably. A space of the middle and lower throat is the most common location. Occasionally it can be located in less obviously place, which force the laryngologist to prevent more viligant diagnostic. A foreign body pounded within soft tissue of the oral cavity is the example. A case report of a metallic foreign body inherent in the tongue for more than six weeks before the final treatment is presented.

Penetrating Orbitofrontal Foreign Body: Case Report

Orbitofrontal foreign-body injuries comprise a major cause of all facial injuries referred to a neurosurgeon. The authors hereby present an unusual case of a pressure regulator of a domestic pressure cooker impacted into the orbit and extending through the orbital roof into the basifrontal cortex. The globe was intact externally with no obvious sign of such a large object impacted behind the globe. On imaging, the foreign body was found to have fractured the orbital roof with one end protruding into the basifrontal cortex. A transcranial approach was taken to remove the object with removal of the orbital rim and roof to reach the object. After successful retrieval of the metallic body, all displaced bone fragments were removed and the dural closure was done in a watertight manner. The vision could not be salvaged, most likely due to damage to the optic nerve. However, the globe was left intact and the ocular movements were normal. An important factor to consider in removal of such foreign bodies is that the bone fragments that get impacted should be meticulously removed and the dural tears should be sealed to prevent any intracranial infections and cerebrospinal fluid leaks. Removal of the orbital rim helps in adequate exposure of the retro-orbital space and the basifrontal dura.

Notes on the nesting biology of five species of Euglossini (Hymenoptera: Apidae) in the Brazilian Amazon

The orchid bees (Euglossini) are medium to large-sized species with fully or partially metallic body that are relatively common in the Neotropical Region. Nevertheless, the nesting biology of many species remains unknown. Therefore, the objective of this paper is to provide new information on the nesting biology of five species of Euglossini found in urban and forested sites of Brazilian Amazon. The nests of Eufriesea pulchra (Smith)and Euglossa chalybeata Friesewere recorded for the first time, found in an active nest of the ant Azteca sp. and in a fallen rotting tree, respectively. The nest of Euglossa townsendi(Linnaeus) was found in the leaf of an ornamental plant Cordyline sp. (Asparagaceae), also newly recorded. Euglossa intersecta Latreillewas recorded nesting in an abandoned termite nest, and Euglossa cordataCockerell was found nesting in a tubular metal window handle.Notas sobre a biologia de nidificação de cinco espécies de Euglossini (Hymenoptera: Apidae) na Amazônia BrasileiraResumo. As abelhas-da-orquídea (Euglossini) possuem tamanho médio a grande, corpo parcialmente ou completamente metálico e são relativamente comuns na região Neotropical. Apesar disso, a biologia de nidificação da maioria das espécies permanece desconhecida. Portanto, o objetivo deste estudo e fornecer novas informações sobre a biologia de nidificação de cinco espécies de Euglossini encontradas em área urbana e florestada da Amazônia Brasileira. Os ninhos de Eufriesea pulchra (Smith)e Euglossa chalybeata Frieseforam registrados pela primeira vez, encontrados dentro de ninho de formiga Azteca sp. e em uma árvore apodrecida caída, respectivamente. O ninho de Euglossa townsendiCockerell foi registrado pela primeira vez em uma folha da planta ornamental Cordyline sp. (Asparagaceae). Euglossa intersecta Latreillefoi registrada nidificando dentro de um ninho abandonado de cupim e Euglossa cordata (Linnaeus)foi encontrada nidificando em uma maçaneta tubular de metal de uma janela.