Fatores de risco nas alianças em projetos de TI: estudo de casos no Banco Central do Brasil

Em resposta às crescentes mudanças e pressões da concorrência, número cada vez maior de empresas tem estabelecido alianças como forma de complementar seus recursos e assegurar suas vantagens competitivas. Embora essas alianças sejam uma boa opção estratégica para as empresas, existem evidências de grande taxa de fracasso. Muitos estudos têm analisado os fatores de sucesso das parcerias, mas poucos têm dado ênfase às dificuldades e à prevenção de riscos. O objetivo neste artigo consiste em apresentar os resultados de uma pesquisa em que se buscou identificar os fatores de risco que dificultam as alianças no caso de projetos de Tecnologia da Informação (TI). Trata-se de uma pesquisa exploratória, focada em cinco projetos estratégicos de TI do Banco Central do Brasil, desenvolvidos em parceria com outras instituições públicas e privadas, a maioria delas nacionais e uma estrangeira. Apesar de os projetos terem tido sucesso, foi possível identificar como principais fatores de risco: falta de planejamento da aliança, falta de negociação entre parceiros, falta de comprometimento dos parceiros e falta de apoio institucional. A pesquisa trouxe lições relevantes para o gerenciamento de projetos que podem beneficiar outras alianças em projetos de TI.

Procedimiento estandarizado de operación: Método de determinación de la tasa de ingestión de organismos filtradores (PEO-IMP-TI-001)

Presenta el procedimiento estándar de operación (PEO) para el método de determinación de la tasa de ingestión de organismos acuáticos filtradores. Describe el equipamiento, materiales necesarios, procedimientos de campo y laboratorio y análisis e interpretación de los datos.

Reliure de : La Biblia laquale in se contiene i sacrosanti libri del Vecchio & Nuovo Testamento , i quali ti apporto christianissimo lettore, tradotti da la hebraica & greca verita in lingua toscana, nuovamente corretta & con ogni diligentia stampata. Con le concordantie di tutta essa scrittura santa, et li summari de ciascun capitolo. Et con due tavole...

[Bible (italien). 1547. Brucioli]

Electron capture and emission by the Ti acceptor level in GaP

Previously reported results on deep level optical spectroscopy, optical absorption, deep level transient spectroscopy, photoluminescence excitation, and time resolved photoluminescence are reviewed and discussed in order to know which are the mechanisms involved in electron capture and emission of the Ti acceptor level in GaP. First, the analysis indicates that the 3T1(F) crystal¿field excited state is not in resonance with the conduction band states. Second, it is shown that both the 3T2 and 3T1(F) excited states do not play any significant role in the process of electron emission and capture.

Perpendicular magnetic anisotropy in chemically disordered FePd-FeV(100) alloy thin films

We find that the use of V(100) buffer layers on MgO(001) substrates for the epitaxy of FePd binary alloys yields to the formation at intermediate and high deposition temperatures of a FePd¿FeV mixed phase due to strong V diffusion accompanied by a loss of layer continuity and strong increase of its mosaic spread. Contrary to what is usually found in this kind of systems, these mixed phase structures exhibit perpendicular magnetic anisotropy (PMA) which is not correlated with the presence of chemical order, almost totally absent in all the fabricated structures, even at deposition temperatures where it is usually obtained with other buffer layers. Thus the observed PMA can be ascribed to the V interdiffusion and the formation of a FeV alloy, being the global sample saturation magnetization also reduced.

Alloy inhomogeneities in InAlAs strained layers grown by MBE

Transmission electron microscopy studies have been performed to characterize InxAl1−xAs layers grown by molecular beam epitaxy on (100) InP substrates. The first observations of compositional nonuniformities in strained InAlAs layers are reported. The coarse quasiperiodic structure present in each sample has been found to be dependent upon the growth parameters and the sample characteristics.

Vacancy-driven ordering in a two-dimensional binary alloy

Domain growth in a system with nonconserved order parameter is studied. We simulate the usual Ising model for binary alloys with concentration 0.5 on a two-dimensional square lattice by Monte Carlo techniques. Measurements of the energy, jump-acceptance ratio, and order parameters are performed. Dynamics based on the diffusion of a single vacancy in the system gives a growth law faster than the usual Allen-Cahn law. Allowing vacancy jumps to next-nearest-neighbor sites is essential to prevent vacancy trapping in the ordered regions. By measuring local order parameters we show that the vacancy prefers to be in the disordered regions (domain boundaries). This naturally concentrates the atomic jumps in the domain boundaries, accelerating the growth compared with the usual exchange mechanism that causes jumps to be homogeneously distributed on the lattice.

Comparison between molecular dynamics abd Monte Carlo simulations of an ordering process in a binary alloy

Ordering in a binary alloy is studied by means of a molecular-dynamics (MD) algorithm which allows to reach the domain growth regime. Results are compared with Monte Carlo simulations using a realistic vacancy-atom (MC-VA) mechanism. At low temperatures fast growth with a dynamical exponent x>1/2 is found for MD and MC-VA. The study of a nonequilibrium ordering process with the two methods shows the importance of the nonhomogeneity of the excitations in the system for determining its macroscopic kinetics.

Temperature and magnetic-field dependence of the elastic constants of Ni-Mn-Al magnetic Heusler alloy

We report on measurements of the adiabatic second-order elastic constants of the off-stoichiometric Ni54Mn23Al23 single-crystalline Heusler alloy. The variation in the temperature dependence of the elastic constants has been investigated across the magnetic transition and over a broad temperature range. Anomalies in the temperature behavior of the elastic constants have been found in the vicinity of the magnetic phase transition. Measurements under applied magnetic field, both isothermal and variable temperature, show that the value of the elastic constants depends on magnetic order, thus giving evidence for magnetoelastic coupling in this alloy system.