Materials Literature
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We report a detailed experimental investigation of the power dependence of excitonic complexes (neutral exciton, neutral biexciton, and charged exciton) confined in single self-assembled GaAs∕AlGaAs strain-free quantum dots grown by droplet epitaxy. By using the random population theory we show that, under stationary…
Energy storage systems have been the bane of utomotive products since the time of Thomas Edison and his ime and investment spent in nickel-iron as the technology hought to be superior to lead-acid batteries of his day. Now, ver a century later, the automotive industry is still caught up in his catch 22 situation and i…
We present an experimental study of the radiative recombination dynamics in size-controlled anatase TiO2 nanoparticles in the range 20–130 nm. From time-integrated photoluminescence spectra and picosecond time-resolved experiments as a function of the nanoparticle size, excitation density, and temperature, we show tha…
Improvements in control systems technology and datalogging have allowed improved dynamic control of the factors affecting strip flatness and quality. Modern automatic flatness control systems for aluminium cold and foil mills have the potential to increase productivity and reduce energy consumption significantly. The…
A neutron-imaging device for alignment purposes has been tested on the INES beamline at ISIS, the pulsed neutron source of Rutherford Appleton Laboratory (U.K.). Its use, in conjunction with a set of movable jaws, turns out extremely useful for scattering application to complex samples where a precise and well-defined…
A leaky surface acoustic wave (LSAW) on 0-15°YX-LiNbO3has a large electro-mechanical coupling factor, but it has a leaky component. The LSAW changes to Love wave without its leaky component, by using a high density metal electrode with a low velocity such as Au and Cu on that substrate. It was reported that a resonato…
O objetivo do trabalho foi elaborar salame tipo italiano, substituindo parcialmente o NaCl por solução de lactato de potássio a 60% na razão de 0,75 e 1,5%, e acompanhar, durante a etapa de permanência do produto dentro da câmara (zero, 2º, 7º, 14º, 21º e 30º dia), algumas características físico-químicas (TBARS, pH, u…
Abstract In situ thermo‐Raman spectroscopy (TRS) measurements were performed in order to investigate solid‐phase transformation of the copper sulfate pentahydrate from room temperature up to 300 °C. Band‐target entropy minimization (BTEM), a blind‐source separation algorithm, was employed in order to identify and reco…
The dependence of critical shear stresses for twinning τ cr tw on the stacking-fault energy γ0, the nitrogen concentration C N (wt %), and the test temperature has been studied for [ $$ \bar 1 $$ 11] single crystals of austenitic stainless steels upon tensile deformation. It is shown that τ cr tw ∼ γ0/b 1 in nitrogen-…
In the State Park Parque Estadual das Fontes do Ipiranga - PEFI, located in the city of São Paulo, samples of submerged mixed leaf litter were collected monthly from 10 sites with different levels of eutrophication, from October 2003 to April 2005. Some abiotic factors, such as pH, temperature, conductivity and dissol…
High-resolution electron energy loss spectroscopy was used to investigate the electronic properties of (111)-oriented Au ultrathin films grown on Cu(111). The loss spectrum showed several features which were ascribed to both single and collective excitations. In particular we distinguished features assignable to dispe…
We consider the response of entangled four-arm polybutadiene star solutions to steady shear and to startup of steady shear in the nonlinear shear-rate regime. Data are reported both for the shear stress, measured in a cone and plate geometry using a temperature controlled ARES rheometer, and for birefringence measured…
The review summarizes and analyzes recent (2004–2008) published data on anionic receptors based on calixarenes.
A symmetry analysis has been made of monoclinic and trigonal superstructures of the M6C5 type, which are formed in nonstoichiometric cubic carbides MC y with a B1 structure. Channels of disorder-order transitions MC y → M6C5 have been revealed, and the distribution functions of carbon atoms in the M6C5 superstructures…
In this work, thin film Metal-Insulator-Metal (MIM) tunnel junction based detector using Ni-NiO-Cr has been developed for Millimeter wave (MMW) detection operating at 94 GHz. Arrays of MIM junctions with 1 μm2 contact area and an ultra-thin insulator layer of ~3 nm has been fabricated using e-beam lithography and reac…
InAs quantum dots have been used to extend the absorption edge of InGaAs/GaAs quantum well solar cells from 940 to ∼1100 nm. In order to improve absorption of infrared radiation by the thin (300 nm) active layer, we exploit its high refractive index, which acts as a waveguide for certain frequencies of light. Surface-…
Plasmon-polariton polarizers on the surface of single-mode channel optical waveguides (OWGs) in lithium niobate crystals have been studied in detail. An original technology for manufacturing polarizers in a single technological cycle has been developed. A polarizer consists of a metal (aluminum) film and a dielectric…
There exist different types of artificial surfaces that can be used to control wave propagation. Examples are soft and hard surfaces, high impedance surfaces and electromagnetic bandgap (EBG) surfaces. Ideal canonical representations of such surfaces are desirable for initial analysis and proof of concept in new appli…
Generalized two-dimensional correlation spectroscopy (2DCOS) and perturbation-correlation moving-window two-dimensional (PCMW2D) correlation spectroscopy were applied to explore the melting behavior of non-annealed and annealed poly(3-hydroxybutyrate) (PHB) homopolymer as studied by variable-temperature Fourier transf…
We (Neuweiler et al., 2009) used scanning electron microscopic, fluorescence spectroscopic, fluorescence microscopic, and thin-section analytical work from modern, Cretaceous, Silurian, and early Neoproterozoic reefal material to make a geological case for an early Neoproterozoic origin of animals. In a modern analogu…