Resumo As redes ATM (Asvnchronous Transfer Mode) foram concebidas consider;ndo a utiliza«ii'a de meios de transmissiio 6pticos, que apresentam taxa de erro de bit pequena. Urn dos principais problemas de se utilizar 0 ATM em redes sem fio esta relacionado a taxa de erro, que e variavel e pode assumir valores elevados. Para contornar este problema, mecanismos adicionais de controle de erro devem...

Molar crown morphology varies among primates from relatively simple in some taxa to more complex in others, with such variability having both functional and taxonomic significance. In addition to the primary cusps, crown surface complexity derives from the presence of crests, cuspules, and crenulations. Developmentally, this complexity results from the deposition of an enamel cap over a basemen...

Oculo-ectodermal syndrome (OES - OMIM 600628), also known as Toriello Lacassie Droste syndrome, is a very rare condition, first described by Toriello et al., in 1993. OES has been proposed to be a mild variant of encephalocraniocutaneous lipomatosis (ECCL). It is characterized by aplasia cutis congenita (ACC), epibulbar dermoids, coarctation of the aorta, arachnoid cysts in the brain, seizure d...

The production of nuclear fuel used in the research reactor at Instituto de Pesquisas Energéticas e Nucleares (IPEN/CNEN-SP) requires a series of chemical and metallurgical processes. The quality of the end product depends on the control over all the stages of the manufacturing process and over the quality of raw materials employed. In fact, spectrometric methods are increasingly used as quanti...

We present a general approach for formally modelling states of object-oriented programs using OBJ 10] speciications and associated order-sorted theory presentations 9]. This formal model can then be used to deene the structural operational semantics 14] of object-oriented languages. Our approach has the advantage of using the power of the theory of abstract data types for deening operations on ...

BACKGROUND/AIM Oral examinations are required for board certification in Ophthalmology in the USA. The current literature offers no recommendation on the number of administrations during residency. The purpose of this study was to determine how often oral examinations (OEs) should be administered and what effects repeated OEs might have on residents' comfort level with OEs and confidence level ...

The 5-day sodium carbonate-ammonium nitrate extraction assay (5-day method) has been recognized by the American Association of Plant Food Control Officials as a validated test method to identify fertilizers or beneficial substances that provide plant-available silicon (Si). The test method used the molybdenum blue colorimetric assay to quantify percentage Si; however, laboratories may use induc...

A METals In Situ analyzer (METIS) has been used to determine dissolved manganese (II) concentrations in the subhalocline waters of the Gotland Deep (central Baltic Sea). High-resolution in situ measurements of total dissolved Mn were obtained in near real-time by spectrophotometry using 1-(2-pyridylazo)-2-naphthol (PAN). PAN is a complexing agent of dissolved Mn and forms a wine-red complex wit...

Inorganic compounds in biomass, often referred to as ash, are known to be problematic in the thermochemical conversion of biomass to bio-oil or syngas and, ultimately, hydrocarbon fuels because they negatively influence reaction pathways, contribute to fouling and corrosion, poison catalysts, and impact waste streams. The most common ash-analysis methods, such as inductively coupled plasma-opti...

The aim of the study was to compare concentrations risk elements (As, Cu, Mn, Ni, Pb, Zn) in alluvial soil, which were measured by a portable X-ray fluorescence analyser (pXRF) situ (FIELD) and laboratory (LABORATORY). Subsequently, regression equations developed for individual through method construction model, results pXRF with classical analysis (ICP-OES). accuracy measurement, expressed coe...