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Experimental study on the wear evolution of different PVD coated tools under milling operations of LDX2101 duplex stainless steel

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Advances in Manufacturing 2023年第1期11卷 158-179页

作者： Vitor F.C.Sousa Francisco J.G.silva ricardo Alexandre Jose S.Fecheira Gustavo Pinto Andresa Baptista ISEP-School of Engineering Polytechnic of PortoRua Dr.António Bernardino de Almeida4314200–072PortoPortugal INEGI-Driving Science and Innovation Rua Dr.Roberto Frias4004200–465PortoPortugal TEandM-Technology Engineering and MaterialsS.A.Parque Industrial do TaveiroLotes 41-423045–504TaveiroPortugal

Duplex stainless steels are being used on applications that require,especially,high corrosion resistance and overall good mechanical properties,such as the naval and oil-gas exploration *** components employed in these industries are usually obtained by machining,however,these alloys have low machinability when compared to conventional stainless *** this work,a study of the wear developed when milling duplex stainless-steel,LDX 2101,is going to be presented and evaluated,employing four types of milling tools with different geometries and coatings,while studying the influence of feed rate and cutting length in the wear of these *** used have been provided with two and four flutes,as well as three different coatings,namely:TiAlN,TiAlSiN and *** cutting behavior of these tools was analyzed;data relative to the cutting forces developed during the process were obtained;and roughness measurements of the machined surfaces were *** tools were then submitted to scanning electron microscope(SEM)analysis,enabling the identification of the wear mechanisms that tools were subjected to when machining this material,furthermore,the early stages of these mechanisms were also *** this work was done with the goal of relating the machining parameters and cutting force values obtained,identifying,and discussing the wear patterns that were observed in the coating and tools after the milling tests,providing further information on the machining of these alloys.

关键词： Duplex stainless-steel Milling Tool coatings Surface roughness Wear mechanisms

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Towards a Link between Climate Extremes and Thermodynamic Patterns in the City of Rio de Janeiro-Brazil: Climatological Aspects and Identified Changes

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Journal of Geoscience and Environment Protection 2023年第8期11卷 131-160页

作者： Wanderson Luiz-silva Fabricio Polifke da silva Claudine Pereira Dereczynski José ricardo de Almeida França Department of Meteorology Institute of Geosciences Federal University of Rio de Janeiro Rio de Janeiro Brazil

Modification signs in extreme weather events may be directly related to alterations in the thermodynamic panorama of the atmosphere that need to be better understood. This study aimed to make a first interconnection between climate extremes and thermodynamic patterns in the city of Rio de Janeiro. Maximum and minimum air temperature and precipitation extreme indices from two surface meteorological stations (ABOV and STCZ) and instability indices based on temperature and humidity from radiosonde observations (SBGL) were employed to investigate changes in the periods 1964-1980 (P1), 1981-2000 (P2), and 2001-2020 (P3). Statistical tests were adopted to determine the significance and magnitude of trends. The frequency of warm (cold) days and warm (cold) nights are increasing (decreasing) in the city. Cold (Warm) extremes are changing with greater magnitude in ABOV (STCZ) than in STCZ (ABOV). In ABOV, there is a significant increase of +84 mm/decade in the rainfall volume associated with severe precipitation (above the 95th percentile) and most extreme precipitation indices show an increase in frequency and intensity. In STCZ, there is a decrease in extreme precipitation until the 1990s, and from there, an increase, showing a wetter climate in the most recent years. It is also verified in SBGL that there is a statistically significant increase (decrease) in air temperature of +0.1°C/decade (-0.2°C/decade) and relative humidity of +1.2%/decade (-3%/decade) at the low and middle (high) troposphere. There is a visible rising trend in most of the evaluated instability indices over the last few decades. The increasing trends of some extreme precipitation indices are probably allied to the precipitable water increasing trend of +1.2 mm/decade.

关键词： Climate Change Climatology Instability Indices Precipitation Extremes Temperature Extremes

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Primary malignant melanoma of the esophagus:A case report

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World Journal of Gastroenterology 2011年第42期17卷 4734-4738页

作者： Joana Machado Paula Ministro ricardo Araújo Eugénia Cancela António Castanheira Américo silva Department of Gastroenterology S Teotónio Hospital

The authors present the clinical case of an 87-year-old Caucasian male admitted to the emergency room with hematemesis. He had a history of intermittent dys-phagia during the previous month. Endoscopic evaluation revealed an eccentric,soft esophageal lesionlocated 25-35 cm from the incisors,which appeared asa protrusion of the esophagus wall,with active bleeding. Biopsies were acquired. Tissue evaluation wascompatible with a melanoma. After excluding other sites of primary neoplasm,the definitive diagnosis of Primary Malignant Melanoma of the Esophagus(PMME) was made. The patient developed a hospital-acquired respiratory infection and died before tumor-directed treatment could begin. Primary malignant melanoma represents only 0.1% to 0.2% of all esophageal ma-lignant tumors. Risk factors for PMME are not defined.A higher incidence of PMME has been described in Japan. Dysphagia,predominantly for solids,is the most frequent symptom at presentation. Retrosternal orepigastric discom fort or pain,melena or hemate mesishave also been described. The characteristic endoscopic finding of PMME is as a polypoid lesion,with variablesize,usually pigmented. The neoplasm occurs in thelower two-thirds of the esophagus in 86% of *** metastasizes via hematogenic and lymphatic pathways. At diagnosis,50% of the patients present with distant metastases to the liver,the mediastinum,the lungs and the brain. When possible,surgery(curative or palliative) ,is the preferential method of treatment. There are some reports in the literature where chemotherapy,chemohormon otherapy,radiotherapy and immunotherapy,with or without surgery,wereused with variable efficacy. The prognosis is poor;themean survival after surgery is less than 15 mo.

关键词： Esophagus Melanoma Esophagoscopy Upper gastrointestinal tract Neoplasms

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Chagas heart disease:An overview of diagnosis,manifestations,treatment,and care

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World Journal of Cardiology 2021年第12期13卷 654-675页

作者： Roberto M Saraiva Mauro Felippe F Mediano Fernanda SNS mendes Gilberto Marcelo Sperandio da silva Henrique H Veloso Luiz Henrique C Sangenis Paula Simplício da silva Flavia Mazzoli-Rocha Andréa S Sousa Marcelo T Holanda Alejandro M Hasslocher-Moreno Evandro Chagas National Institute of Infectious Diseases Oswaldo Cruz FoundationRio de Janeiro 21040-900RJBrazil

Chagas heart disease(CHD)affects approximately 30%of patients chronically infected with the protozoa Trypanosoma *** is classified into four stages of increasing severity according to electrocardiographic,echocardiographic,and clinical *** presents with a myriad of clinical manifestations,but its main complications are sudden cardiac death,heart failure,and ***,CHD has a higher incidence of sudden cardiac death and stroke than most other cardiopathies,and patients with CHD complicated by heart failure have a higher mortality than patients with heart failure caused by other *** patients with CHD,approximately 90%of deaths can be attributed to complications of Chagas *** cardiac death is the most common cause of death(55%–60%),followed by heart failure(25%–30%)and stroke(10%–15%).The high morbimortality and the unique characteristics of CHD demand an individualized approach according to the stage of the disease and associated complications the patient presents ***,the management of CHD is challenging,and in this review,we present the most updated available data to help clinicians and cardiologists in the care of these *** describe the clinical manifestations,diagnosis and classification criteria,risk stratification,and approach to the different clinical aspects of CHD using diagnostic tools and pharmacological and non-pharmacological treatments.

关键词： Chagas disease Diagnosis Treatment Heart failure Arrhythmia Stroke

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Mini-cutting technique for Khaya anthotheca: selection of suitable IBA concentration and nutrient solution for its vegetative propagation

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Journal of Forestry Research 2018年第1期29卷 73-84页

作者： Joamir Barbosa Filho Maria Angélica Di Carvalho Leandro silva de Oliveira Enéas ricardo Konzen Gilvano Ebling Brondani College of Forestry Federal University of Mato Grosso(UFMT) Institute of Agronomic Sciences Federal University of Minas Gerais (UFMG) Department of Forest Sciences Federal University of Lavras (UFLA)

Khaya anthotheca is a hardwood species from Africa and recently introduced to Brazil. This species yields high-quality wood for diverse applications, but little has been done toward an effective propagation method for large-scale production in nurseries. We evaluated the effects of different concentrations of macro and micronutrients（i.e., 100, 50 and 25% of the concentration of a referenced solution） combined with indole-3-butyric acid（IBA） at 0 and 2 g L-1 on the survival rate of mini-stumps and the survival and adventitious rooting of K. anthotheca mini-cuttings. The mini-stumps were grown from a source of seeds imported from Ghana, West Africa. The ministumps survived at a high rate（97%）. Consistently high shoot yields were obtained from the mini-stumps（average of 1.8 per mini-stump）. High survival percentage of minicuttings and adventitious rooting were observed when solutions with 100 and 50% of the nutrients concentration were combined with 2 g L-1 IBA. Histological sections analyzed through optical microscopy indicated the tissues from mini-cutting stems were juvenile, which might have stimulated adventitious rooting. These results have important implications for further work aimed at establishing propagation strategies for K. anthotheca, which are of prime importance for assisting breeding programs of this species.

关键词： African mahogany Seminal mini-garden Adventitious rooting Juvenile tissue Mini-stump

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Region-based classification of PolSAR data using radial basis kernel functions with stochastic distances

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International Journal of Digital Earth 2019年第6期12卷 699-719页

作者： Rogerio G.Negri Alejandro C.Frery Wagner B.silva Tatiana S.G.mendes Luciano V.Dutra UNESP-Universidade Estadual Paulista ICT-Instituto de Ciencia e TecnologiaSão Jose dos CamposBrazil LaCCAN-Laboratorio de de Computacao Cientifica e Analise Numerica UFAL-Universidade Federal de AlagoasMaceioBrazil Secao de Ensino de Engenharia Cartografica IME-Instituto Militar de EngenhariaRio de JaneiroBrazil DPI-Divisao de Processamento de Imagens INPE-Instituto Nacional de Pesquisas EspaciaisSao Jose dos CamposBrazil

Region-based classification of PolSAR data can be effectively performed by seeking for the assignment that minimizes a distance between prototypes and *** et al.[“Classification of segments in PolSAR imagery by minimum stochastic distances between wishart distributions.”IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing 6(3):1263–1273]used stochastic distances between complex multivariate Wishart models which,differently from other measures,are computationally *** this work we assess the robustness of such approach with respect to errors in the training stage,and propose an extension that alleviates such *** introduce robustness in the process by incorporating a combination of radial basis kernel functions and stochastic distances with Support Vector Machines(SVM).We consider several stochastic distances between Wishart:Bhatacharyya,Kullback-Leibler,Chi-Square,Rényi,and *** perform two case studies with PolSAR images,both simulated and from actual sensors,and different classification scenarios to compare the performance of Minimum Distance and SVM classification *** this,we model the situation of imperfect training *** show that SVM with the proposed kernel functions achieves better performance with respect to Minimum Distance,at the expense of more computational resources and the need of parameter *** and data are provided for reproducibility.

关键词： PolSAR image classification stochastic distance minimum distance classifier SVM

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Diversity of the Formicidae (Hymenoptera) carrion communities in Lisbon (Portugal): preliminary approach as seasonal and geographic indicators

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Forensic Sciences Research 2018年第1期3卷 65-73页

作者： António Neto-silva ricardo Jorge Dinis-Oliveira Catarina Prado e Castro Department of Public Health Forensic Sciences and Medical EducationFaculty of MedicineUniversity of PortoPortoPortugal Department of Sciences IINFACTS-Institute of Research and Advanced Training in Health Sciences and TechnologiesUniversity Institute of Health Sciences(IUCS)CESPUCRLGandraPortugal UCIBIO REQUIMTE-Laboratory of ToxicologyDepartment of Biological SciencesFaculty of PharmacyUniversity of PortoPortoPortugal Department of Life Sciences Centre for Functional EcologyUniversity of CoimbraCoimbraPortugal

The value of the Formicidae (Insecta,Hymenoptera) community in forensic investigations is poorly studied in *** order to better understand the structure and dynamics of this group of insects in cadavers and their putative value in forensic investigations,studies were carried out in Lisbon area during one *** carcasses were used as a model of human *** entomofauna attracted to the carcasses was collected over a period of about 2 months in each season of the *** collection of ants was performed at regular intervals,daily in the first 23 days and then with intervals of 2,3 or 5 days until the end of the *** stages of cadaveric decomposition were recognized with the ants being present in all of *** hundred and nine specimens were captured: 7 in autumn,6 in winter,90 in spring and 206 in *** specimens belong to three subfamilies and seven different *** of them had never been mentioned before as being associated to cadavers in this geographical *** and summer had the greater diversity of species and a larger number of *** luteus was the dominant species in spring and Tapinoma nigerrimum in *** the information of other similar studies carried out in the Iberian Peninsula,the sarcosaprophagous Formicidae community found in Lisbon is unique and different from other studied locations,which supports the need to perform regional *** results shown that ants do not present a definite pattern of succession,but some species have the potential to be seasonal or geographic indicators.

关键词： Forensic science forensic entomology Formicidae sarcosaprophagous community decomposition process postmortem interval seasonal study

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Therapeutic and biological activities of Calotropis procera(Ait.) ***.

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Asian Pacific Journal of Tropical Medicine 2010年第4期3卷 332-336页

作者： Marcia Calheiros Chaves silva Antonio Batista da silva Fabiano Moura Teixeira Paulo Cesar Pereira de Sousa Regina Maria Macedo Rondon Jose Eduardo Ribeiro Honorio Junior Luiz Rafael Leite Sampaio Samanda Lima Oliveira Angela Nadyla Martins Holonda silvania Maria mendes de Vasconcelos Enfermeira Mestre em Farmacologia/Universidade Federal do Ceara/UFC Farmaceutico Mestre em Patologia Tropical/Universidade Federal do Amazonas/UFAM Biologo Mestre em Bioquimica/Universidade Federal do Ceara/UFC Farmaceutico Mestre em Ciencias Farmaceutica/Universidade Federal do Ceara/UFC Biologa Mestre em Producao Animal/Universidade Estadual do Ceara/UECE Biologo Mestre em Fisiologia da Universidade Estadual do Ceara/UECE Enfermeiro Mestrando em Farmacologia da Universidade Federal do Ceara/UFC Aluna de Farmacia da Universidade Federal do Ceara/UFC Enfermeira Professora Adjunto do Depto.de Fisiologia e Farmacologia da Universidade Federal do Ceara/UFC

Medicinal plants have been used to treat various ailments of the poor population around the world;hence the interest among researchers to know the active ingredients of certain plants has being *** Calotropis procera(***) is a plant original from Africa,commonly found in northeastern *** is well known for their pharmacological properties,since it produces large amounts of *** important role that medicinal plants play in folk medicine has led us to develop this article in order to review the major pharmacological activities of C. procera.

关键词： Calotropis procera Pharmacological activity Medicinal plants

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Feasibility and safety of autologous bone marrow mononuclear cell transplantation in patients with advanced chronic liver disease

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World Journal of Gastroenterology 2007年第7期13卷 1067-1073页

作者： Andre Castro lyra Milena Botelho Pereira Soares luiz Flavio Maia da silva Marcos Fraga Fortes André Goyanna Pinheiro silva Augusto César de Andrade Mota Sheilla A Oliveira Eduardo lorens Braga Wilson Andrade de Carvalho Bernd Genser ricardo Ribeiro dos Santos luiz Guilherme Costa lyra Hos-pital Sao Rafael Salvador Bahia Brazil Centro de Pesquisas Goncalo Moniz Fundacao Oswaldo Cruz Salvador Bahia Brazil BGStats Consulting Graz Austria

AIM： To evaluate the safety and feasibility of bone marrow cell （BMC） transplantation in patients with chronic liver disease on the waiting list for liver transplantation. METHODS： Ten patients （eight males） with chronic liver disease were enrolled to receive infusion of autologous bone marrow-derived cells. Seven patients were classified as Child-Pugh B and three as Child-Pugh C. Baseline assessment included complete clinical and laboratory evaluation and abdominal MRI. Approximately 50 mL of bone marrow aspirate was prepared by centrifugation in a ficoll-hypaque gradient. At least of 100 millions of mononuclear-enriched BMCs were infused into the hepatic artery using the routine technique for arterial chemoembolization for liver tumors. Patients were followed up for adverse events up to 4 mo. RESULTS： The median age of the patients was 52 years （range 24-70 years）. All patients were discharged 48 h after BMC infusion. Two patients complained ofmild pain at the bone marrow needle puncture site. No other complications or specific side effects related to the procedure were observed. Bilirubin levels were lower at 1 （2.19 ± 0.9） and 4 mo （2.10 ± 1.0） after cell transplantation that baseline levels （238 ± 1.2）. Albumin levels 4 mo after BMC infusion （3.73 ± 0.5） were higher than baseline levels （3.47 ± 0.5）. International normalized ratio （INR） decreased from 1.48 （SD = 0.23） to 1.43 （SD = 0.23） one month after cell transplantation. CONCLUSION： BMC infusion into hepatic artery of patients with advanced chronic liver disease is safe and feasible. In addition, a decrease in mean serum bilirubin and INR levels and an increase in albumin levels are observed. Our data warrant further studies in order to evaluate the effect of BMC transplantation in patients with advanced chronic liver disease.

关键词： Bone marrow Cell transplantation Liverfailure Stem cell Cirrhosis

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Recycling process and proto-kimberlite melt metasomatism in the lithosphere-asthenosphere boundary beneath the Amazonian Craton recorded by garnet xenocrysts and mantle xenoliths from the Carolina kimberlite

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Geoscience Frontiers 2022年第5期13卷 89-105页

作者： Fernanda Gervasoni Tiago Jalowitzki Marcelo Peres Rocha ricardo Kalikowski Weska Eduardo Novais-Rodrigues Rodrigo Antonio de Freitas Rodrigues Yannick Bussweiler Elisa Soares Rocha Barbosa Jasper Berndt Elton Luiz dantas Valmir da silva Souza Stephan Klemme Centro de Engenharias Universidade Federal de Pelotas(UFPel)PelotasBrazil Programa de Pós-graduação em Geociências Universidade Federal do Rio Grande do SulPorto AlegreBrazil Programa de Pós-graduação em Geologia Instituto de GeociênciasUniversidade de Brasília(UnB)BrasíliaBrazil Faculdade de Geociências Universidade Federal do Mato Grosso(UFMT)CuiabáBrazil Institut für Geologie und Mineralogie Universität zu KölnGermany Faculdade de Ciências e Tecnologia Universidade Federal de Goiás(UFG)Aparecida de GoiâniaBrazil Institut für Mineralogie Universität MünsterMünsterGermany

Here we present new data on the major and trace element compositions of silicate and oxide minerals from mantle xenoliths brought to the surface by the Carolina kimberlite,Pimenta Bueno Kimberlitic Field,which is located on the southwestern border of the Amazonian *** also present Sr-Nd isotopic data of garnet xenocrysts and whole-rocks from the Carolina *** xenoliths are mainly clinopyroxenites and *** of the clinopyroxenites were classified as GPP–PP–PKP(garnet-phlogopite peridotite,phlogopite-peridotite,phlogopite-K-richterite peridotite)suites,and two clinopyroxenites(eclogites)and two garnetites are relicts of an ancient subducted *** and pressure estimates yield 855–1102℃ and 3.6–7.0 GPa,*** are enriched in light rare earth elements(LREE)(La_(N)/Yb_(N)=5–62;Ce_(N)/Sm_(N)=1–3;where N=primitive mantle normalized values),they have high Ca/Al ratios(10–410),low to medium Ti/Eu ratios(742–2840),and low Zr/Hf ratios(13–26),which suggest they were formed by metasomatic reactions with CO_(2)-rich silicate *** with high TiO_(2)(>2.0 wt.%),Al_(2)O_(3)(>12.0 wt.%),and FeOt(5.0–13.0 wt.%)resemble those found in the groundmass of kimberlites,lamproites and ***,phlogopite with low TiO_(2)(<1.0 wt.%)and lower Al_(2)O_(3)(<12.0 wt.%)are similar to those present in GPP-PP-PKP,and in MARID(mica-amphibole-rutile-ilmenite-diopside)and PIC(phlogopite-ilmenite-clinopyorxene)*** GPP-PP-PKP suite of xenoliths,together with the clinopyroxene and phlogopite major and trace element signatures suggests that an intense proto-kimberlite melt metasomatism occurred in the deep cratonic lithosphere beneath the Amazonian *** Sr-Nd isotopic ratios of pyrope xenocrysts(G3,G9 and G11)from the Carolina kimberlite are characterized by high ^(143)Nd/^(144)Nd(0.51287–0.51371)and eNd(+4.55 to+20.85)accompanied with enriched ^(87)Sr/^(86)Sr(0.70405–0.71098).These results suggest intera

关键词： Carolina kimberlite K-rich mantle xenoliths Ancient subducted slab Proto-kimberlite melt metasomatism

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