13,156 research outputs found
Complexos agroalimentares do milho, da soja e do trigo no Brasil.
Informacoes disponiveis para caracterizar os complexos agroindustrias da soja, do milho e do trigo no Brasil.bitstream/item/118238/1/complexos-agroalimentares-do-milho-soja-e-trigo.pd
Analytical and numerical studies of disordered spin-1 Heisenberg chains with aperiodic couplings
We investigate the low-temperature properties of the one-dimensional spin-1
Heisenberg model with geometric fluctuations induced by aperiodic but
deterministic coupling distributions, involving two parameters. We focus on two
aperiodic sequences, the Fibonacci sequence and the 6-3 sequence. Our goal is
to understand how these geometric fluctuations modify the physics of the
(gapped) Haldane phase, which corresponds to the ground state of the uniform
spin-1 chain. We make use of different adaptations of the strong-disorder
renormalization-group (SDRG) scheme of Ma, Dasgupta and Hu, widely employed in
the study of random spin chains, supplemented by quantum Monte Carlo and
density-matrix renormalization-group numerical calculations, to study the
nature of the ground state as the coupling modulation is increased. We find no
phase transition for the Fibonacci chain, while we show that the 6-3 chain
exhibits a phase transition to a gapless, aperiodicity-dominated phase similar
to the one found for the aperiodic spin-1/2 XXZ chain. Contrary to what is
verified for random spin-1 chains, we show that different adaptations of the
SDRG scheme may lead to different qualitative conclusions about the nature of
the ground state in the presence of aperiodic coupling modulations.Comment: Accepted for publication in Physical Review
Preventing biofouling in heat exchangers: an experimental assessment of the effects of water velocity and inorganic particles on deposit detachment
Biofouling is a costly problem in heat exchangers. Biocides can be used to minimize the formation of biofilms, but they are not always effective and, moreover, they are generally deleterious to the environment. The use of proper liquid velocities or of water jets in the exchanger tubes is also a means to prevent the build up of fouling deposits or to clean the surface once they are formed. Often, biofilms incorporate inorganic particles which modify the physical properties of the deposit and, thus, affect the effectiveness of anti-fouling measures. This paper presents experimental data that show the effects of the water velocity and of the presence of clay particles on the accumulation of biofilms and on their mechanical resistance to detachment caused by hydrodynamic forces. The results indicate that the fraction of dry biomass (micro-organisms plus extracellular biopolymers) in biofilms increases with the liquid velocity and that the deposits formed under higher hydrodynamic forces are more resistant to detachment. The resistance to detachment is even greater when the biofilms incorporate small (20 micrometer) clay particles
Intrinsic kinetics of biofilms formed under turbulent flow and low substrate concentrations
Reactor operating conditions strongly affect the
behaviour of biofilm systems, namely their stability and
the substrate removal. In this paper, the penetration of
substrate and the activity of biofilms formed by Pseudomonas
fluorescens under turbulent flow and low substrate
concentrations, are studied. A first order diffusion-reaction
model was applied to results of biofilm accumulation
in steady and non-steady-state. The substrate consumption
rate of the biofilm was calculated based on the on-line
determination of the biofilm accumulated on the surface.
This approach is important when the residence time or the
substrate concentration on the reactor is very low. Also,
the mass transfer of substrate inside the biofilm was
measured for every case under study and introduced in the
model.
The fraction of biofilm penetrated by the substrate depends
on the velocity of the fluid that contacts the biological
matrix: contrary to biofilms formed at higher
velocities, lower velocities give raise to non completely
penetrated biofilms. This fact seems to be associated to the
biofilm internal structure in terms of biomass density and
compactness of the matrix. They remove more substrate
per reactor volume, but are less resistant from an hydrodynamic
point of view. In conclusion, biofilms formed at
higher velocities in turbulent flow allow a more stable
reactor operation.Fundação para a Ciência e a Tecnologia (FCT) - PRAXIS XXI, 2.1/BIO/37/94.
União Europeia - Fundo de Desenvolvimento Regional Europeu (FDRE) - INTERREG, 01/REG II/6/96
Physical stability and biological activity of biofilms under turbulent flow and low substrate concentration
The paper focuses on biofilms subject to turbulent
flow and high liquid velocity (of the order of
1 m s ˉ¹) which can be found in heat exchangers, water
distribution systems and in some wastewater reactors. An
overall model describing biofilm development is presented,
which includes the effects of biomass detachment due
to the hydrodynamic forces. A methodology for estimating
substrate consumption from data obtained through continuous
monitoring of biofilm growth is presented. Results
show that the physical stability of the biofilm increases
with the liquid velocity, while the rate of substrate consumption
decreases.Fundação para a Ciência e a Tecnologia - PRAXIS XXI, 2.1/BIO/37/94 .
Uniãoo Europeia - Fundo de Desenvolvimento Regional Europeu - Programme INTERREG - 01/REG II/6/9
All-optical trapping and acceleration of heavy particles
A scheme for fast, compact, and controllable acceleration of heavy particles
in vacuum is proposed, in which two counterpropagating lasers with variable
frequencies drive a beat-wave structure with variable phase velocity, thus
allowing for trapping and acceleration of heavy particles, such as ions or
muons. Fine control over the energy distribution and the total charge of the
beam is obtained via tuning of the frequency variation. The acceleration scheme
is described with a one-dimensional theory, providing the general conditions
for trapping and scaling laws for the relevant features of the particle beam.
Two-dimensional, electromagnetic particle-in-cell simulations confirm the
validity and the robustness of the physical mechanism.Comment: 10 pages, 3 figures, to appear in New Journal of Physic
Chemical composition and activity of a biofilm during the start-up of an airlift reactor
For the successful operation of a biofilm reactor, it is important to characterise the fixed biomass,
its activity and composition. The purpose of this research was to monitor the biofilm characteristics of an
airlift reactor, namely its composition in terms of exopolymers (polysaccharides and proteins), attached
biomass, thickness, total proteins, as well as its activity in terms of substrate consumption rates. During the
early phases of biofilm development, a high exopolymer production was observed, which helped in
promoting the initial cell adhesion. The high turbulence with strong abrasive conditions might also trigger the
excretion of those polymers. Low levels of extracellular proteins were detected, showing that the proteins in
the biofilm were mainly intracellular. The biofilm accumulation on the carrier was accompanied by an
increased biological activity; however, at the end of the experiment, the specific substrate consumption rate
decreased, probably because of a reduction of the cell density within the biofilm.Fundação para a Ciência e a Tecnologia (FCT) – PRAXIS XXI/BM/6699/95
- …