Measurement of the Charge Collection Efficiency after Heavy Non-Uniform Irradiation in BaBar Silicon Detectors

We have investigated the depletion voltage changes, the leakage current increase and the charge collection efficiency of a silicon microstrip detector identical to those used in the inner layers of the BaBar Silicon Vertex Tracker (SVT) after heavy non-uniform irradiation. A full SVT module with the front-end electronics connected has been irradiated with a 0.9 GeV electron beam up to a peak fluence of 3.5 x 10^14 e^-/cm^2, well beyond the level causing substrate type inversion. We irradiated one of the two sensors composing the module with a non-uniform profile with sigma=1.4 mm that simulates the conditions encountered in the BaBar experiment by the modules intersecting the horizontal machine plane. The position dependence of the charge collection properties and the depletion voltage have been investigated in detail using a 1060 nm LED and an innovative measuring technique based only on the digital output of the chip.Comment: 7 pages, 13 figures. Presented at the 2004 IEEE Nuclear Science Symposium, October 18-21, Rome, Italy. Accepted for publication by IEEE Transactions on Nuclear Scienc

Aproveitamento de fósforo pela cana energia.

RESUMO - O experimento foi realizado pela Usina Granelli, na propriedade Bacuri, Ipeúna/SP. Teve como objetivo verificar o aproveitamento de fosforo original de solo e enriquecido pela adubação fosfatada no plantio em 150 kg P2O5 no sulco em variedades de cana energia e uma convencional. O experimento foi iniciado com cana no dia 10/10/2018, seguido pelo corte de duas soqueiras em maio, sendo pesado e mensurado por análises tecnológicas. A variedade de cana convencional RB86 7515 apresentou a maior amplitude e resposta ao tratamento, mesmo na ressoca. Todavia, ressalta-se que as variedades de cana energia apresentaram boa produtividade mesmo sem aplicação de P no solo.Evento online. CIIC 2021

Comparing C-60 and C-70 as acceptor in organic solar cells : Influence of the electronic structure and aggregation size on the photovoltaic characteristics

The difference in aggregation size of the C-60 and C-70 fullerenes affect the photovoltaic performance of devices assembled in the so-called bilayer architecture with poly [2,7-(9,9- dioctyl- dibenzosilole)- alt-4,7- bis(thiophen-2-yl)benzo- 2,1,3- thiadiazole] (PSiF-DBT) as the electron donor material. Despite the better performance of the C-70 devices, which is related to the high absorption coefficient in the visible range and the superior charge transport properties, the short-circuit current variation upon annealing treatment at 100 degrees C is approximately twice bigger when the C-60 is the acceptor. We attribute this effect to the tendency of C-60 in form smaller aggregate domains relatively to the C-70. The increased roughness on the polymeric surface after annealing results in an enhanced donor/acceptor contact area and assists the fullerene diffusion deeper inside the polymeric layer. This effect leads to a better mixing between donor and acceptor species and create a interpenetrating layer close to the so-called bulk heterojunction. Since C-60 forms smaller aggregates, this mechanism is more pronounced for this molecule. Therefore, a significant variation in the performance of the C-60 devices is observed after this kind of treatment. Density Functional Theory calculations of the potential energy of interaction between two fullerene molecules and X-Ray measurements gives evidences to support this idea. In addition, combining spectrally resolved external quantum efficiency measurements with optical modeling our results also indicate the occurrence of the bilayer interfacial mixing for PSiF-DBT/C-60.Peer reviewe

Direct Determination of Sugar Cane Quality Parameters by X-ray Spectrometry and Multivariate Analysis

Current methods for quality control of sugar cane are performed in extracted juice using several methodologies, often requiring appreciable time and chemicals (eventually toxic), making the methods not green and expensive. The present study proposes the use of X-ray spectrometry together with chemometric methods as an innovative and alternative technique for determining sugar cane quality parameters, specifically sucrose concentration, POL, and fiber content. Measurements in stem, leaf, and juice were performed, and those applied directly in stem provided the best results. Prediction models for sugar cane stem determinations with a single 60 s irradiation using portable X-ray fluorescence equipment allows estimating the % sucrose, % fiber, and POL simultaneously. Average relative deviations in the prediction step of around 8% are acceptable if considering that field measurements were done. These results may indicate the best period to cut a particular crop as well as for evaluating the quality of sugar cane for the sugar and alcohol industries.Fapesp [2011_05860-2]FAPESPCNPqCNP

Efficient Behavior of Small-World Networks

We introduce the concept of efficiency of a network, measuring how efficiently it exchanges information. By using this simple measure small-world networks are seen as systems that are both globally and locally efficient. This allows to give a clear physical meaning to the concept of small-world, and also to perform a precise quantitative a nalysis of both weighted and unweighted networks. We study neural networks and man-made communication and transportation systems and we show that the underlying general principle of their construction is in fact a small-world principle of high efficiency.Comment: 1 figure, 2 tables. Revised version. Accepted for publication in Phys. Rev. Let

Influência de fontes de fosfato natural reativo e interações com fontes de carbono na produtividade agroindustrial da cana-de-açúcar em solo arenoso, em Piracicaba, SP.

Com o objetivo de avaliar diferentes fontes e doses de adubos fosfatados, aplicados na cana-de-açúcar em ambiente de baixa fertilidade, o experimento foi instalado em solo arenoso no município de Piracicaba-SP.Evento online. CIIC 2022. Nº 22604

Efeito de doses de irradiação gama sobre gemas germinadas de cana de açúcar (Saccharum Spp).

Introdução. Metodologia. Materiais. Métodos. Resultados e discussões. Conclusão.bitstream/item/172532/1/PL-Efeito-doses-FCesar-etal.pd

Avaliação experimental e panorama da cana energia na cadeia produtiva sucroenergética: caracterização e identificação de potencialidades.

RESUMO. É recente a utilização de cana energia nas usinas, sendo poucas as que estão aderindo a essa tecnologia pela necessidade de entendimento das mudanças nos sistemas de produção e de seus coeficientes técnicos. Esse artigo objetivou estudar as variedades de cana energia Vignis 3 (tipo 1) e Vignis 1126 (tipo 2), fornecidas pela empresa Vignis, e comparadas com a variedade açucareira (convencional) RB 867515. Implantou-se experimento de campo em solo de baixa fertilidade com 18 parcelas de 5 ruas de 10 metros, em três locais, cada local representando em duplicata, para comparação em termos biométrico, composicional e energético. A cana energia tipo I apresentou teor médio de fibra de 15,1%, a tipo II 18,8%, enquanto a convencional 14,2%; em termos de ATR, as canas energias atingiram 80% e 67% da cana convencional, respectivamente. Na avaliação energética da unidade de fibra seca de cada material, uma das variedades de cana energia demonstrou grande potencial para combustão, sendo 17 e 8% superior à cana convencional, respectivamente em poder calorífico. A cana energia é uma opção agrícola que possui um perfil apropriado para suprir a necessidade do mercado energético, especialmente por permitir o cultivo em solos de baixa fertilidade e alta resiliência ambiental.JORNACITEC 2019

Synthesis and Characterization of a Naphthalimide-Benzonitrile Derivative and Evaluation of Optoelectronics Properties

The authors would like to thank the Brazilian Agency Funding: CNPq, CAPES and Fundaçăo Araucária

Work related injuries: estimating the incidence among illegally employed immigrants

BACKGROUND: Statistics on occupational accidents are based on data from registered employees. With the increasing number of immigrants employed illegally and/or without regular working visas in many developed countries, it is of interest to estimate the injury rate among such unregistered workers. FINDINGS: The current study was conducted in an area of North-Eastern Italy. The sources of information employed in the present study were the Accidents and Emergencies records of a hospital; the population data on foreign-born residents in the hospital catchment area (Health Care District 4, Primary Care Trust 20, Province of Verona, Veneto Region, North-Eastern Italy); and the estimated proportion of illegally employed workers in representative samples from the Province of Verona and the Veneto Region. Of the 419 A&E records collected between January and December 2004 among non European Union (non-EU) immigrants, 146 aroused suspicion by reporting the home, rather than the workplace, as the site of the accident. These cases were the numerator of the rate. The number of illegally employed non-EU workers, denominator of the rate, was estimated according to different assumptions and ranged from between 537 to 1,338 individuals. The corresponding rates varied from 109.1 to 271.8 per 1,000 non-EU illegal employees, against 65 per 1,000 reported in Italy in 2004. CONCLUSIONS: The results of this study suggest that there is an unrecorded burden of illegally employed immigrants suffering from work related injuries. Additional efforts for prevention of injuries in the workplace are required to decrease this number. It can be concluded that the Italian National Institute for the Insurance of Work Related Injuries (INAIL) probably underestimates the incidence of these accidents in Italy