Horizon Formation in High-Energy Particles Collision

We investigate a classical formation of a trapped surface in 4-dimensional flat space-time in a process of a non-head-on collision of two high-energy particles which are treated as Aichelburg-Sexl shock waves. From the condition of the horizon volume local maximality an equation for the trapped surface is deduced. Using a known solution on the shocks we find a time-dependent solution describing the trapped surface between the shocks. We analyze the horizon appearance and evolution. Obtained results may describe qualitatively the horizon formation in higher dimensional space-time.Comment: Latex2e, 8 pages, 6 figures, references adde

The Meladema Laporte, 1835 (Coleoptera, Dytiscidae) of the Sahara Desert

Meladema Laporte, 1835 is a genus of large diving beetles, found in the Western Palaearctic, from the Canary Islands and Madeira to western Turkey (Bilton &amp; Ribera 2017). The genus currently contains four species: the widespread M. coriacea Laporte, 1835, distributed from the Canary Islands to Turkey and ranging from southern France and the central Balkans south to the central Sahara, two Atlantic Island endemics, M. imbricata (Wollaston, 1871) from the western Canary Islands and M. lanio (Fabricius, 1775) from the main island of Madeira, and a fourth, recently described species, M. lepidoptera Bilton &amp; Ribera, 2017 from the Tyrrhenian Islands (Corsica, Sardinia, Elba, Montecristo) and parts of the Italian mainland (Bilton &amp; Ribera 2017). </jats:p

Fósforo, fosfato de rocha e fluorose em bovinos.

Fosfatos naturais na alimentação animal. Uso e abuso dos fosfatos naturais. Essencialidade do flúor. Metabolismo do flúor. Fluor e produção de leite. Flúor e reprodução. O flúor e a barreira placentária. Recuperação do animal exposto ao flúor. Antagonistas do flúor. Efeitos tóxicos do flúor. Diagnóstico de fluorese. Dentição normal dos bovinos. Fluorose dentária.bitstream/item/104565/1/Fosforo-fosfato-de-rocha.pd

Spatiotemporal monthly rainfall reconstruction via artificial neural network ? case study: south of Brazil

International audienceClimatological records users, frequently, request time series for geographical locations where there is no observed meteorological attributes. Climatological conditions of the areas or points of interest have to be calculated interpolating observations in the time of neighboring stations and climate proxy. The aim of the present work is the application of reliable and robust procedures for monthly reconstruction of precipitation time series. Time series is a special case of symbolic regression and we can use Artificial Neural Network (ANN) to explore the spatiotemporal dependence of meteorological attributes. The ANN seems to be an important tool for the propagation of the related weather information to provide practical solution of uncertainties associated with interpolation, capturing the spatiotemporal structure of the data. In practice, one determines the embedding dimension of the time series attractor (delay time that determine how data are processed) and uses these numbers to define the network's architecture. Meteorological attributes can be accurately predicted by the ANN model architecture: designing, training, validation and testing; the best generalization of new data is obtained when the mapping represents the systematic aspects of the data, rather capturing the specific details of the particular training set. As illustration one takes monthly total rainfall series recorded in the period 1961?2005 in the Rio Grande do Sul ? Brazil. This reliable and robust reconstruction method has good performance and in particular, they were able to capture the intrinsic dynamic of atmospheric activities. The regional rainfall has been related to high-frequency atmospheric phenomena, such as El Niño and La Niña events, and low frequency phenomena, such as the Pacific Decadal Oscillation

On Entropy Function for Supersymmetric Black Rings

The entropy function for five-dimensional supersymmetric black rings, which are solutions of $U(1)^{3}$ minimal supergravity, is calculated via both on-shell and off-shell formalism. We find that at the tree level, the entropy function obtained from both perspectives can reproduce the Bekenstein-Hawking entropy. We also compute the higher order corrections to the entropy arising form five-dimensional Gauss-Bonnet term as well as supersymmetric $R^{2}$ completion respectively and compare the results with previous microscopic calculations.Comment: 17 pages, no figure, JHEP3 style, to appear in JHEP

Analysis of the influence of two different milling processes on the properties of beta-TCP precursor powder and cement

There are several characteristics that put calcium phosphate cements in evidence, like its bioactivity and in vivo resorption. The influence of two milling processes on the morphological properties of the [beta]-tricalcium phosphate powder, [beta]-TCP, and in the mechanical properties of the cement were analyzed. The powder was obtained by solid state reaction of CaCO3 and CaHPO4 at 1050 ºC. It showed high phase purity and absence of toxic elements. The powder was processed in ball mill (A) and high-energy vibratory mill (B), with posterior analysis by SEM and particle size distribution. The powders showed different average and distribution of grain size. Finally, the cement prepared with powder submitted to process (B) showed values of axial tensile strength significantly greater than that prepared with powder submitted to process (A). The milling process (B) is much more efficient than the process (A).São várias as características que tem colocado os cimentos de fosfato de cálcio em evidência na área dos biomateriais, como sua bioatividade e reabsorção in vivo. Neste trabalho, analisou-se a influência de dois processos de moagem nas propriedades morfológicas do pó de [beta]-fosfato tricálcico, [beta]-TCP, e na resistência mecânica do cimento. O pó foi obtido via reação no estado sólido de CaCO3 e CaHPO4 a 1050 ºC, apresentando pureza de fase e ausência de elementos tóxicos. O pó foi moído em: (A) moinho de bolas e (B) moinho vibratório de alta energia; sendo analisado por MEV e distribuição granulométrica. Os pós apresentaram propriedades diferentes com relação à distribuição e tamanho médio de grão. Finalmente, o cimento preparado com o pó submetido ao processo (B) apresentou valores de resistência mecânica significativamente maiores que o preparado com o pó submetido ao processo (A). Conclui-se que o processo de moagem (B) é muito mais eficiente que o processo (A).Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)UNICAMP FEM DEMAUNIFESP Instituto de Ciência e TecnologiaUNIFESP, Instituto de Ciência e TecnologiaSciEL

Predisposition, Insult/Infection, Response and Organ Dysfunction (PIRO): A Pilot Clinical Staging System for Hospital Mortality in Patients with Infection

Purpose To develop a clinical staging system based on the PIRO concept (Predisposition, Infection, Response and Organ dysfunction) for hospitalized patients with infection. Methods One year prospective cohort study of all hospitalized patients with infection (n = 1035), admitted into a large tertiary care, university hospital. Variables associated with hospital mortality were selected using logistic regressions. Based on the regression coefficients, a score for each PIRO component was developed and a classification tree was used to stratify patients into four stages of increased risk of hospital mortality. The final clinical staging system was then validated using an independent cohort (n = 186). Results Factors significantly associated with hospital mortality were • for Predisposition: age, sex, previous antibiotic therapy, chronic hepatic disease, chronic hematologic disease, cancer, atherosclerosis and a Karnofsky index50%. Finally, this new clinical staging system was studied in a validation cohort, which provided similar results (0%, 9%, 31% and 67%, in each stage, respectively). Conclusions Based on the PIRO concept, a new clinical staging system was developed for hospitalized patients with infection, allowing stratification into four stages of increased mortality, using the different scores obtained in Predisposition, Response, Infection and Organ dysfunction. The proposed system will likely help to define inclusion criteria in clinical trials as well as tailoring individual management plans for patients with infectionThis research was supported by an unrestricted grant from ASSUCIP - Associação de Apoio à Unidade de Cuidados Intensivos Polivalente, Hospital de Santo António, Porto, Portugal (Intensive Care Unit Support Association). Teresa Cardoso is funded by a PhD research grant from the Teaching and Research Department (Departamento de Formação, Ensino e Investigação) of Oporto Hospital Centre. Teixeira-Pinto is funded by a clinical research grant from the Science and Technology Foundation (PIC/IC/83312/2007). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript

Produção e qualidade de frutos de cultivares de melancia em ecossistema de "terra firme" do Estado do Amazonas.

Neste trabalho, avaliaram-se diferentes cultivares de melancia e dois espaçamentos, para a produção de melancia na terra firme do Amazonas. O ensaio foi conduzido na Embrapa Amazônia Ocidental, Iranduba-AM, em Argissolo Amarelo distrófico, textura média, de junho a agosto de 2010