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Evaluation of Geometric Quality of Weld Beads in the Joining of Carbon Steel Pipelines with Single Pass

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Journal of Power and Energy Engineering 2013年第7期1卷 1-5页

作者： josé Eduardo silveira Leal Thonson Ferreira Costa Rosenda Valdés Arencibia Federal Universityof Uberlandia Avenida Joao Naves de Avila2121Campus Santa MonicaBloco 5FCEP 38400-902Uberlandia-MGBrazil

This work presents the uncertainty evaluation associated with the measurement of linear parameters that define the weld geometry, specifically the width, using a profile projector, in order to meet the current technical standards. The following steps were proposed and implemented: identification of linear parameters that define the weld geometry;identification and study of variables that affect the measurement of these parameters;the adoption of the mathematical model to estimate the uncertainty;planning and execution of experiments for data collection, calculation of uncertainty and, finally, analysis and discussion of the results. Through the results analysis it was concluded that the weld in overhead position produces the lowest front bead width values and the vertical weld produces the largest width values. The expanded uncertainty values were between 0.016 mm and 0.075 mm for all measurements, and the overhead position showed, on average, the highest values.

关键词： Welding Weld Bead Geometry Profile Projector Uncertainty

Starch Digestibility and Functional Properties of Rice Starch Subjected to Gamma Radiation

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Rice science 2018年第1期25卷 42-51页

作者： Luís Fernando POLESI Silene Bruder silveira SARMENTO Solange Guidolin CANNIATTI-BRAZACA Center for Nuclear Energy in Agriculture University of Sao Paulo Department of Food Engineering Federal University of Rondonia Department of Agri-Food Industry Food and NutritionLuiz de Queiroz College of AgricultureUniversity of Sao Paulo

This study investigated the effect of gamma radiation on the digestibility and functional properties of rice *** cultivars IRGA417 and IAC202 were used for isolation of starch by the alkaline *** samples were irradiated with 1,2 and 5 k Gy doses of ^(60)Co at a rate of 0.4 k Gy/h.A control sample,which was not irradiated,was used for *** and control starches were characterized by in vitro starch digestibility,total dietary fiber,color,water absorption index,water solubility index,syneresis,swelling factor,amylose leaching,pasting properties and gel *** changed starch digestibility differently in either *** radiation doses promoted increase in the color parameter b*(yellow),elevation in the capacity to absorb water,and solubility in water as well as the amylose leached from granules for both *** properties showed a decrease that was proportional to the dose applied,caused by the depolymerization of starch *** firmness of the starch from IAC202 was inversely proportional to the radiation dose applied,whereas for IRGA417,there was a reduction at 5 k Gy *** starches can be modified by irradiation to exhibit different functional characteristics and they can be used by the food industries in products such as soups,desserts,flans,puddings and others.

关键词： Oryza sativa irradiation viscosity swelling amylose starch digestibility

Laccases from Actinobacteria—What We Have and What to Expect

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Advances in Microbiology 2014年第6期4卷 285-296页

作者： Tatiana Alves Rigamonte Fernandes Wendel Batista da silveira flávia Maria Lopes Passos Tiago Domingues Zucchi Embrapa Meio Ambiente Rodovia SP 340JaguariúnaBrazil Departamento de Microbiologia BIOAGROUniversidade Federal de ViçosaCampus UniversitarioVicosaBrazil

Laccases are blue multicopper enzymes, capable of oxidizing diverse aromatic and non-aromatic compounds of industrial interest, concomitantly with reduction of molecular oxygen to water. Tolerance to extreme conditions, such as high temperature, salinity or extreme pH, is required for practical industrial applications. Here we focus on bacterial laccases from the phylum Actinobacteria, notably the order Actinomycetales. Currently, less than 10 enzymes have been properly characterized, all belonging to genus Streptomyces, but it is noteworthy that all of them have exhibited industrially important properties. Furthermore, studies with enzymes from this phylum revealed a novel molecular structure of laccases, providing the basis for a distinct family, the two-domain laccases. The relevant traits of actinomycetes laccases emphasize the need for more studies involving the isolation of this bacterial group from lignin-rich environmental samples, detection of their laccase activity and thereafter, characterization of the proteins and related genes. The nonhomogeneous responses of actinomycetes laccases to traditional inhibitors, substrates or metal ions have challenged the currently accepted “laccase concept”. Finally, considering that distinguishing laccase activity in vitro from other ligninolytic enzymes becomes a difficult task due to overlaps in catalytical properties of the enzymes, we proposed a simple flow chart to help experimental assays.

关键词： Actinomycetes Lignin Degradation Multicopper Oxidase Laccases

Factors Associated with Late Diagnosis of Oral Cancer

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International Journal of Clinical Medicine 2015年第2期6卷 105-111页

作者： Jerlucia Cavalcanti das Neves Lívia Soraya Toledano Fabiana Moura da Motta silveira Paulo Sávio Angeiras de Góes Postgraduate Program in Dentistry (Collective Health) Faculdade de Odontologia de Pernambuco Universidade de Pernambuco Recife Brazil Faculdade de Odontologia do Recife Recife Brazil Epidemiology and Public Health University of London London UK Department of General and Preventive Dentistry Universidade Federal de Pernambuco Recife Brazil

Objective: The aim of the present study was to determine associations between the late diagnosis of oral cancer and demographic/clinical factors. A quantitative cross-sectional study was carried out in 2007. Material and Method: Oral tumors were recorded based on the TNM staging system, with T1 and T2 considered early diagnosis and T3 and T4 considered late diagnosis. Results: Patient age ranged from 30 to 105 years (mean: 64.7). Just over half of the patients (54.9%) resided in urban areas and approximately 1/4 (25.7%) had an agricultural occupation. The majority had smoking habits (89.9%) and consumed alcohol (62.5%). The most frequent tumor site was the tongue (42.4%), followed by the hard palate (19.2%) and lip (12.2%). The majority (70.1%) were in advanced stages (III and IV). A greater percentage of smokers were in advanced stages than non-smokers. The percentage of cases in the early stages was lowest when the tumor was located in the tongue (14.1%) and highest when located in the buccal mucosa (80.0%). Conclusion: The main causes of the late diagnosis of oral cancer are insufficient training on the part of physicians and dentists in the field of pathology, delays on the part of patients in seeking medical assistance and deficient access to quality medical care, reflecting the absence of preventive public health programs and an effective healthcare system.

关键词： Oral Cancer Late Diagnosis Clinical Stage

Static-based early-damage detection using symbolic data analysis and unsupervised learning methods

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Frontiers of Structural and Civil Engineering 2015年第1期9卷 1-16页

作者： Joao Pedro SANTOS Christian CREMONA Andre D. ORCESI Paulo silveira Luis CALADO Department of Structures Av. Brasil 101 Lisbon 1700-066 Portugal Technical Center for Bridge Engineering CEREMA B.P. 214 Provins Cedex 77487 France Materials and Structures Department IFSTTAR University Paris-Est 14-20 Boulevard Newton Champs sur Marne Marne la Vallee Cedex2 F-77447 France Department of Civil Engineering Technical University Lisbon Avenida Rovisco Pais Lisbon 1096 Portugal

A large amount of researches and studies have been recently performed by applying statistical and machine learning techniques for vibration-based damage detection. However, the global character inherent to the limited number of modal properties issued from operational modal analysis may be not appropriate for early-damage, which has generally a local character. The present paper aims at detecting this type of damage by using static SHM data and by assuming that early-damage produces dead load redistribution. To achieve this objective a data driven strategy is proposed, consisting of the combination of advanced statistical and machine learning methods such as principal component analysis, symbolic data analysis and cluster analysis. From this analysis it was observed that, under the noise levels measured on site, the proposed strategy is able to automatically detect stiffness reduction in stay cables reaching at least 1%.

关键词： structural health monitoring early-damage detection principal component analysis symbolic data symbolic dissimilarity measures cluster analysis numerical model damage simulations

Phallales (Agaricomycetes, Fungi) from Southern Brazil

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Studies in Fungi 2019年第1期4卷 162-184页

作者： Trierveiler-Pereira L Meijer AAR silveira RMB Programa de Pós-Graduação em Botânica Departamento de BotânicaIBUniversidade Federal do Rio Grande do Sul(UFRGS)Porto Alegre-RSBrazil Rodovia PR-405 km 36GuaraqueçabaParanáBrazil

An illustrated and annotated checklist with key to 24 species of phalloids known to occur in Southern Brazil(States of Paraná,Santa Catarina and Rio Grande do Sul)are *** species belong to the orders Clathraceae,Claustulaceae,Lysuraceae,Phallaceae and *** species are also *** floriforme and Staheliomyces cinctus are the first reports from Southern Brazil and Laternea pusilla is new to the State of Santa Catarina.

关键词： Brazilian mycota fungal taxonomy phalloid fungi Phallomycetidae stinkhorns

Turbulent Inlet Conditions Modeling using Large-eddy Simulations

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Computer Modeling in Engineering & Sciences 2015年第2期104卷 105-132页

作者： M.M.R.Damasceno J.M.Vedovoto A.da silveira-Neto UFU UberlandiaMGBrazil

Turbulence is a phenomenon which presents peculiarities when it is experimented or *** occurs due to its complexity and high sensibility to the inlet conditions of the turbulent flow fields,as well as the presence of a large range of time and length scales.A simplification for this situation is obtained with the use of approximations and turbulence *** the present work,the Largeeddy Simulations methodology was applied,aiming the modeling of the previously mentioned complexity,which consists in using a filter to resolve the large scales while the remaining scales were determined by classical and dynamic Smagorinsky *** different approximations for the inlet conditions were applied:white noise,Random flow Generation(RFG)and Synthetic Eddy Method(SEM).It was possible to realize that the use of the dynamic Smagorinky model and the RFG or SEM methodologies resulted in a better characterization of the studied flow.

关键词： turbulent inlet conditions turbulence models large-eddy simulations

A perivascular epithelioid cell tumor of the stomach:An unsuspected diagnosis

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World Journal of Gastroenterology 2010年第4期16卷 522-525页

作者： Cristina Aparecida Troques da silveira Mitteldorf Dario Birolini Luis Heraldo da Camara-Lopes Laboratory of Surgical and Molecular Pathology Hospital Sírio Libanêsrua Dona Adma Jafet 91So PauloSP 01308-050Brazil Department of Surgery of the University of So Paulo Medical School av. Dr. Enéas de Carvalho Aguiar 25505403-000 So Paulo SP Brazil Hospital Sírio Libanês rua Dona Adma Jafet 91 So Paulo SP 01308-050 Brazil Genoa Biotechnology S.A. Alameda Ministro Rocha Azevedo 346 1st floor 01410-000So Paulo SP 01308-050 Brazil

Perivascular epithelioid cell tumor(PEComa) is a rare mesenchymal neoplasia and currently well recognized as a distinct entity with characteristic morphological,immunohistochemical and molecular *** report a case of PEComa arising in the antrum of a 71-year-old female with *** tumor,located predominantly in the submucosa as a well delimited nodule,measured 3.0 cm in diameter and was completely resected,with no evidence of the disease ***,it was composed predominantly of eosinophilic epithelioid cells arranged in small nests commonly related to variably sized vessels,with abundant extracellular material,moderate nuclear variation and discrete mitotic *** necrosis,angiolymphatic invasion or perineural infil-tration was *** cells were uniformly positive for vimentin,smooth muscle actin,desmin and melan *** unusual,PEComa should be considered in the differential diagnosis of gastric neoplasia with characteristic epithelioid and oncocytic features and prominent vasculature.

关键词： Perivascular epithelioid cell tumor Stomach Gastrointestinal hemorrhage

Complex derivatives valuation: applying the Least-Squares Monte Carlo Simulation Method with several polynomial basis

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Financial Innovation 2016年第1期2卷 1-14页

作者： Ursula silveira Monteiro de Lima Carlos Patricio Samanez Department of Industrial Engineering Pontifical Catholic University of Rio de JaneiroMarquês de São Vicente Street225/22453-900 GáveaRio de JaneiroBrazil

Background:This article investigates the Least-Squares Monte Carlo Method by using different polynomial basis in American Asian Options *** standard approach in the option pricing literature is to choose the basis *** comparing four different polynomial basis we show that the choice of basis interferes in the option's ***:We assess Least-Squares Method performance in pricing four different American Asian Options by using four polynomial basis:Power,Laguerre,Legendre and Hermite *** every American Asian Option priced,three sets of parameters are used in order to evaluate it ***:We show that the choice of the basis interferes in the option's price by showing that one of them converges to the option's value faster than any other by using fewer simulated *** the case of an Amerasian call option,for example,we find that the preferable polynomial basis is Hermite *** an Amerasian put option,the Power polynomial basis is *** empirical outcome is theoretically unpredictable,since in principle all basis can be indistinctly used when pricing the ***:In this article The Least-Squares Monte Carlo Method performance is assessed in pricing four different types of American Asian Options by using four different polynomial basis through three different sets of *** results suggest that one polynomial basis is best suited to perform the method when pricing an American Asian *** all basis can be indistinctly used when pricing the ***,our results does not confirm *** find that when pricing an American Asian put option,Power A is better than the other basis we have studied here whereas when pricing an American Asian call,Hermite A is better.

关键词： Complex derivatives valuation Least-Squares Monte Carlo Method Amerasian options Polynomial basis