Validation of spallation neutron production and propagation within Geant4

Using simulations to understand backgrounds from muon-induced neutrons is important in designing next-generation low-background underground experiments. Validation of relevant physics within the Geant4 simulation package has been completed by comparing to data from two recent experiments. Verification focused on the production and propagation of neutrons at energies important to underground experiments. Discrepancies were observed between experimental data and the simulation. Techniques were explored to correct for these discrepancies.Comment: 12 pages, 6 figures, 5 tables, submitted to NIM A. 6 Aug 200

Performance of sheep grazing Panicum maximum cv. Massai and supplemented with protein sources during the dry season

The low quality of tropical grasses in the dry season justifies the use of dietary supplements to meet the nutritional needs of sheep. The objective of this study was to evaluate the effect of supplementation with high-protein feed on mutton sheep performance and yield in Massai grass pastures during the dry season. The treatments corresponded to four supplements, namely Leucaena leucocephala leaf hay, Gliricidia sepium leaf hay, soybean meal, and a treatment that received only multiple mixture (protein salt) ad libitum. The pasture was evaluated for canopy height, forage supply, and chemical composition of leaf blade, stem and dead material. Average daily gain, weight gain per area, and the stocking rate were also evaluated. There were four grazing cycles because the grazing method was rotational stocking with seven days of occupation and 35 days of rest. The interaction between supplements and grazing cycles was not significant, and no effects of the supplements were found for any of the variables. The highest forage and leaf blade offerings were observed in the first grazing cycle. The highest levels of crude protein and lower neutral detergent fibre and lignin of pasture components were observed in cycles 3 and 4. The highest average daily gains per animal and per area were observed in cycles 1 and 2. Protein supplementation of sheep in Massai grass pastures promotes satisfactory gains during the dry season, and Leucaena and Gliricidia hays can be used as protein sources instead of soybean meal. Keywords: Gliricidia sepium, leguminous, Leucaena leucocephala, pastur

Geometric approach to nonvariational singular elliptic equations

In this work we develop a systematic geometric approach to study fully nonlinear elliptic equations with singular absorption terms as well as their related free boundary problems. The magnitude of the singularity is measured by a negative parameter $(\gamma -1)$, for $0 < \gamma < 1$, which reflects on lack of smoothness for an existing solution along the singular interface between its positive and zero phases. We establish existence as well sharp regularity properties of solutions. We further prove that minimal solutions are non-degenerate and obtain fine geometric-measure properties of the free boundary $\mathfrak{F} = \partial \{u > 0 \}$. In particular we show sharp Hausdorff estimates which imply local finiteness of the perimeter of the region $\{u > 0 \}$ and $\mathcal{H}^{n-1}$ a.e. weak differentiability property of $\mathfrak{F}$.Comment: Paper from D. Araujo's Ph.D. thesis, distinguished at the 2013 Carlos Gutierrez prize for best thesis, Archive for Rational Mechanics and Analysis 201

Blood Pressure And Cardiac Autonomic Modulation At Rest, During Exercise And Recovery Time In The Young Overweight

This study aimed to assess the blood pressure (BP), cardiac autonomic modulation at rest, in physical exercise and in the recovery in untrained eutrophic (E) and overweight (O) youth. The body mass index (BMI), waist circumference (WC), systolic BP-SBP (E: 109.80 ± 10.05; O: 121.85 ± 6.98 mmHg) and diastolic BP DBP (E: 65.90 ± 7.28; O: 73.14 ± 12.22 mmHg) were higher in overweight and the heart rate recovery (%HRR) was lower as compared with E volunteers. The BMI was associated with SBP (r= 0.54), DBP (r= 0.65), load on the heart rate variability threshold-HRVT (r=-0.46), %HRR2' (r=-0.48) and %HRR 5′ (r=-0.48), and WC was associated with SBP (r= 0.54), DBP (r= 0.64) and HRR2' (r=-0.49). The %HRR was associated to SBP, DBP and HRVT. In summary, the anthropometric variables, BP and cardiac autonomic modulation in the recovery are altered in overweight youth.221273

PIRÓLISE DE RESÍDUO DE PETRÓLEO UTILIZANDO MATERIAL MESOPOROSO DO TIPO AL SBA – 15

Os impactos ambientais causados pela indústria do petróleo é um tema em constante discursão. Neste contexto, se destacam os resíduos industriais que são lançados para o meio ambiente, entre eles a borra oleosa, proveniente da indústria de petróleo.  Considerando o avanço nas pesquisas cientificas e tecnológicas, com o objetivo de minimizar essa poluição ambiental, a aplicação de materiais catalíticos é uma alternativa para adicionar a esses resíduos, visando obter produtos valiosos, como destilados médios na faixa dos combustíveis gasolina e diesel. Neste trabalho, é proposta a aplicação do material catalítico mesoporoso do tipo AlSBA-15 adicionado a borra oleosa de petróleo e a aplicação do processo de pirólise, visando a obtenção de hidrocarbonetos de alto valor agregado. A acidez associado com os mesoporos da AlSBA-15 são os responsáveis pela atividade e seletividade catalítica