A parallel multigrid solver for multi-patch Isogeometric Analysis

Isogeometric Analysis (IgA) is a framework for setting up spline-based discretizations of partial differential equations, which has been introduced around a decade ago and has gained much attention since then. If large spline degrees are considered, one obtains the approximation power of a high-order method, but the number of degrees of freedom behaves like for a low-order method. One important ingredient to use a discretization with large spline degree, is a robust and preferably parallelizable solver. While numerical evidence shows that multigrid solvers with standard smoothers (like Gauss Seidel) does not perform well if the spline degree is increased, the multigrid solvers proposed by the authors and their co-workers proved to behave optimal both in the grid size and the spline degree. In the present paper, the authors want to show that those solvers are parallelizable and that they scale well in a parallel environment.Comment: The first author would like to thank the Austrian Science Fund (FWF) for the financial support through the DK W1214-04, while the second author was supported by the FWF grant NFN S117-0

Evaluation of the biomethane potential of solid fish waste

Manufacturing processes in fish canning industries generate a considerable amount of solid waste that can be digested anaerobically. The aim of this research was to study the biochemical methane potential of different solid fish waste. For tuna, sardine and needle fish waste, around 0.47 g COD–CH4/g CODadded was obtained in batch experiments with 1%TS; whereas for mackerel waste, the methane production attained 0.59 g COD–CH4/g CODadded. The increase in the waste/inoculum ratio, from 1.1–1.3 to 2.8– 3.3 g VSwaste/g VSinoculum, led to overload due to VFA and LCFA accumulation. Afterward, co-digestion assays of fish waste with gorse were undertaken but the biochemical methane potential did not improve.This work was supported by project QREN SI-I&DT, number 2509 from 15/5/2008. Marta Eiroa wishes to express her gratitude to the "Xunta de Galicia" (Spain) for her post-doc fellowship (Angeles Alvarino) and Jose Carlos Costa to the "Fundacao para a Ciencia e a Tecnologia" (Portugal) and "Fundo Social Europeu" through the Grant SFRH/BDP/48962/2008. The authors thank the Ministry of Science and Innovation of the Spanish government for the funds provided through the Torres Quevedo Programme (PTQ-09-02-01663) and the collaboration with Bilega Energia S.L

Atributos físicos do solo em formas de semeadura da pastagem de inverno associadas a intervalos entre pastejos.

O cultivo de pastagens de inverno em áreas de lavoura e o seu manejo sob pastejo direto pode provocar alterações nos atributos físicos do solo, cuja intensidade depende do grau de mobilização do solo, do intervalo entre pastejos, da carga animal e das condições climáticas. Para estudar esses aspectos, foi conduzido durante quatro anos um experimento com delineamento em blocos casualizados com parcelas subdivididas e quatro repetições. Nas parcelas principais foram aplicadas duas formas de semeadura da cultura de inverno (semeadura direta e semeadura + gradagem) e, nas subparcelas, quatro intervalos entre pastejos (sem pastejo e pastejo em intervalos de 7, 14 e 28 dias). Amostras de solo com estrutura preservada foram coletadas logo após a dessecação da pastagem, na camada de 0,00-0,05 m para determinação da condutividade hidráulica saturada e estabilidade de agregados e nas camadas de 0,00-0,05, 0,05-0,10, 0-10-0,15 e 0,15-0,20 m para determinar a densidade e as classes de poros do solo. A semeadura direta da pastagem aumenta a condutividade hidráulica saturada e reduz a densidade do solo em relação à semeadura + gradagem, enquanto o pisoteio aumenta a densidade do solo e reduz a macroporosidade apenas na camada mais superficial do solo, entre 0,00-0,05 m de profundidade. As diferenças nos atributos físicos do solo são maiores entre anos de amostragem do que entre intervalos de entrada dos animais na pastagem

Manejo da pastagem de inverno afetando atributos de solo e da cultura do milho, em sistema de integração lavoura-pecuária com gado leiteiro.

Carla Maria Pandolfo3, EPAGRI ? Campos Novos, SC Alvadi Antonio Balbinot Junior

Technical note Biological treatment of industrial wastewater containing formaldehyde and formic acid

The biological treatment of wastewater from an aminoplastic resin-producing industry was studied in a pre-denitrification system. This study reports results on the removal of organic matter and nitrogen compounds from wastewater which contained high levels of formaldehyde and formic acid. The formaldehyde concentration in the feed varied between 2 087.0 and 2 200.0 mg/ℓ, the mean removal being 99.9%. The mean efficiency of formic acid removal was 99.7%, and its concentration in the feed ranged between 1 384.6 and 1 513.9 mg/ℓ. The total organic carbon (TOC) values in the feed varied from 1 423.0 to 1 599.5 mg/ℓ, corresponding to an organic loading rate of about 0.20 kg TOC/m3·d. High TOC removal was achieved, around 92.0%. With regard to nitrogen compounds, the total Kjeldahl nitrogen (TKN) concentration in the feed ranged between 467.8 and 492.3 mg/ℓ. The applied nitrogen loading rate was around 0.06 kg TKN/m3·d, and the mean percentage of TKN removal was 76.7%. Water SA Vol 32(1)pp:115-11

Periodontoid Pseudotumor in Tuberous Sclerosis Associated With Neck Diffuse Lipomatosis

Tuberous sclerosis (TS) is a genetic multisystem disorder associated with the development of benign tumors in many organs. Diffuse lipomatosis, which represents the overgrowth of fatty tissue in one part of the body, is a very rare finding reported in patients with tuberous sclerosis. We describe the case of a patient with diffuse lipomatosis in the right scapular, posterior cervical and perivertebral regions, associated with a space-occupying lesion adjacent to the odontoid process of C2 that appeared to be a pseudotumor, and discuss possible relation between these entities.info:eu-repo/semantics/publishedVersio

Manejo da pastagem anual de inverno afetando a emergência de plantas daninhas na cultura do milho em sucessão.

O objetivo deste trabalho foi avaliar os efeitos de duas formas de semeadura e quatro intervalos entre pastejos, sem e com adubação nitrogenada da pastagem de inverno, sobre a emergência de plantas daninhas na cultura do milho em sucessão. A densidade de plantas daninhas monocotiledôneas na cultura do milho não foi influenciada pela forma de implantação, intervalos entre pastejo e adubação da pastagem de inverno. A densidade de plantas daninhas dicotiledôneas na cultura do milho foi reduzida pela implantação da pastagem de inverno sem uso de grade e pelo maior intervalo entre os pastejos