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Pseudo-discontinuum model to simulate hard-rock mine pillars

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Underground Space 2023年第4期11卷 81-95页

作者： Erick Ro genes Alessandra dos Santos Gomes marcio muniz de farias Leandro Lima Rasmussen Faculty of Technology University of BrasiliaDF 70910-900BrasiliaBrazil

In this study,the pseudo-discontinuum modeling technique,called continuum Voronoi block model(CVBM),was applied to repre-sent the behavior of hard-rock pillars from underground mines subjected to high field *** CVBM’s ability to produce numerical results consistent with the observed behavior of pillars is demonstrated through the numerical analysis of a hypothetical case and a back analysis of the Creighton mine *** results show that the model can capture convergence displacements and explicitly show the formation of macro-fractures parallel to excavation walls,intact rock slabs,and V-shaped *** components are characteristics of brittle failure induced by highly stressed ground *** studies presented in this work confirm the CVBM as a convenient tool for the numerical modeling of intact rock pillars excavated in deep underground mines.

关键词： Brittle failure Spalling Bulking Voronoi tessellation

Serum 1,3-beta-D-glucan as a noninvasive test to predict histologic activity in patients with inflammatory bowel disease

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World Journal of Gastroenterology 2021年第9期27卷 866-885页

作者： Katia farias e Silva Hayandra F Nanini Cynthia Machado Cascabulho Siane L B Rosas Patricia T Santana Antonio Joséde V Carneiro Elias Anaissie marcio Nucci Heitor Siffert Pereira de Souza department of Clinical Medicine School of MedicineFederal University of Rio de JaneiroRio de Janeiro 21941-913Brazil Laboratory of Innovations in Therapies Education and BioproductsInstituto Oswaldo CruzRio de Janeiro 21040-360Brazil Clinical Trial and Consulting Services CincinnatiOH 45267United States Internal Medicine D'Or Institute for Research and Education(IDOR)Rio de Janeiro 22281-100Brazil

BACKGROUND 1,3-beta-D-glucan(BG)is a ubiquitous cell wall component of gut *** hypothesized that the serum levels of BG could reflect active intestinal inflammation in patients with inflammatory bowel *** To determine whether the serum BG concentrations correlate with intestinal *** A prospective observational study was performed in a tertiary referral center,from 2016 to 2019,in which serum BG was determined in 115 patients with Crohn’s disease(CD),51 with ulcerative colitis(UC),and 82 controls using a photometric detection *** activity was determined by ileocolonoscopy,histopathology,magnetic resonance enterography,and biomarkers,including fecal calprotectin(FC),C-reactive protein,and a panel of *** ability of BG to detect active vs inactive disease was assessed using the area under the receiver operating characteristic *** subgroup analysis,serial BG was used to assess the response to therapeutic *** The serum BG levels were higher in CD patients than in controls(P=0.0001).The BG levels paralleled the endoscopic activity in CD patients and histologic activity and combined endoscopic and histologic activity in both CD and UC *** area under the curve(AUC)in receiver operating characteristic analysis to predict endoscopic activity was 0.694[95%confidence interval(CI):0.60-0.79;P=0.001]in CD,and 0.662(95%CI:0.51-0.81;P=0.066)in UC *** AUC in receiver operating characteristic analysis to predict histologic activity was 0.860(95%CI:0.77-0.95;P<0.001)in CD,and 0.786(95%CI:0.57-0.99;P=0.015)in UC *** cut-off values of BG for both endoscopic and histologic activity were 60μg/mL in CD,and 40μg/mL in UC *** analysis showed that the results based on BG of 40 and 60μg/mL were more specific for predicting endoscopic activity(71.8%and 87.2%for CD;and 87.5%and 87.5%for UC,respectively)than FC(53.3%and 66.7%for CD;and 20%and 80%for UC,respectively);and

关键词： Crohn’s disease Ulcerative colitis Inflammatory bowel disease Beta-glucan Histologic activity Noninvasive test

Water Retention Curve and Particle Breakage of Aggregates Recycled from demolition Waste

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Journal of Civil Engineering and Architecture 2014年第9期8卷 1194-1203页

作者： Alejandra Maria Gomez Jimenez Maircio muniz de farias Manoel Porfirio Cordao Neto Ivan Fernando Otalvaro Calle department of Civil and Environmental Engineering University of Brasilia Brasilia CEP 70.910-900 Brazil department of Civil and Industrial Engineering Pontifical Xaverian University Cali 118-250 Colombia

CDW （construction and demolition wastes） present a high amount of aggregate chips covered with mortar. This results in high absorption of water with a direct impact in particle breakage or disaggregation. It is supposed that intra particle suction plays an important role in this phenomenon. However, WRCs （water retention curves） of CDW are not well understood. In this work, the WRCs of dynamically compacted specimens of aggregates recycled from the demolition of the National Stadium in Brasilia are studied. The objective of this study is to obtain WRCs of the recycled materials by using the pressure plate and filter paper methods. The breaking effect during compaction is quantified from the grain size distribution curves. The particle breakage during compaction increases when the energy is augmented. The results from the WRCs were incorporated into a pore size capillary model to predict pore size distribution.

关键词： Construction and demolition wastes water retention curve particle breakage.

Artificial Neural Network for Websites Classification with Phishing Characteristics

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Social Networking 2018年第2期7卷 97-109页

作者： Ricardo Pinto Ferreira Andréa Martiniano Domingos Napolitano marcio Romero Dacyr Dante de Oliveira Gatto Edquel Bueno Prado farias Renato José Sassi Graduate Program in Informaticsand Knowledge Management Universidade Nove de Julho S&atilde o Paulo Brazil

Several threats are propagated by malicious websites largely classified as phishing. Its function is important information for users with the purpose of criminal practice. In summary, phishing is a technique used on the Internet by criminals for online fraud. The Artificial Neural Networks (ANN) are computational models inspired by the structure of the brain and aim to simu-late human behavior, such as learning, association, generalization and ab-straction when subjected to training. In this paper, an ANN Multilayer Per-ceptron (MLP) type was applied for websites classification with phishing cha-racteristics. The results obtained encourage the application of an ANN-MLP in the classification of websites with phishing characteristics.

关键词： Artificial Intelligence Artificial Neural Network Pattern Recognition Phishing Characteristics Social Engineering

Practice of Physical Activity and Its Relationship with Lipid Profile of Adolescents

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Health 2014年第17期6卷 2356-2363页

作者： Mayenne Rodrigues Oliveira Ivelise F.A.F.da Costa Camilla Ribeiro Lima de farias Monica Oliveira da Silva Simoes Carla Campos muniz Medeiros Danielle Franklin de Carvalho department of Nursing State University of ParaibaCampina GrandeBrazil Graduate Program in Public Health Centre for Epidemiological ResearchState University of ParaibaCampina GrandeBrazil department of Pharmacy Graduate Program in Public HealthCentre for Epidemiological ResearchState University of ParaibaCampina GrandeBrazil department of Nursing Graduate Program in Public HealthCentre for Epidemiological ResearchState University of ParaibaCampina GrandeBrazil

In order to assess the prevalence of physical activity (PA) and its relationship with lipid profile among adolescents, a cross-sectional study with a quantitative approach was conducted with 102 adolescents aged 15 to 19 years from public schools of Campina Grande, Paraiba, Brazil. The following variables were analyzed: age, gender, ethnicity, maternal education, socioeconomic status, nutritional status, the practice of PA and lipid profile. The variables were obtained through validated form, anthropometry (weight and height) and blood collection by contract laboratory. Double entry and SPSS (Statistical Package for Social Sciences) 22.0 were performed. First, a descriptive analysis of all variables was conducted, as well as measures of central tendency and dispersion for continuous variables. Accordingly, distribution was tested for normality using the Kolmogorov-Smirnov test. According to results, correlation was evaluated by Pearson/Spearman tests. Significance level of 5% was adopted for all analyses. The study was approved by the Ethics Approach Committee (EAC) of the State University of Paraíba. The most prevalent sex in the sample was female and regarding maternal education, 35.4% had complete high school. Regarding serum lipoproteins, 16% showed elevated total cholesterol and HDL (High density Lipoprotein) 66% below the desired value. With regard to physical activity, 60.8% had insufficient PA levels. The sample showed changes in lipid profile and insufficiently active life style, besides having overpowered the eutrophic nutritional status. No statistically significant correlations between variables of the lipid profile and the time of PA were observed. These findings highlight the importance of physical exercise for maintaining health and suggest studies with larger populations in order to check the scientific literature regarding this topic.

关键词： Adolescents Motor Activity Cholesterol-HDL Dyslipidemias

Lipoprotein(a)and Ultrasensitive C-Reactive Protein in Overweight Adolescents

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Health 2014年第17期6卷 2349-2355页

作者： Débora Larissa Rufino Alves Camilla Ribeiro Lima de farias Ivelise F.A.F.da Costa Monica Oliveira da Silva Simoes Carla Campos muniz Medeiros Danielle Franklin de Carvalho department of Nursing State University of ParaibaCampina GrandeBrazil Graduate Program in Public Health Centre for Epidemiological ResearchState University of ParaibaCampina GrandeBrazil department of Pharmacy Graduate Program in Public HealthCentre for Epidemiological ResearchState University of ParaibaCampina GrandeBrazil department of Nursing Graduate Program in Public HealthCentre for Epidemiological ResearchState University of ParaibaCampina GrandeBrazil

Introduction: The more intense and early development of obesity, the greater the risk of persistence and severity of comorbidities, such as cardiovascular disease. There is evidence that high serum concentrations of lipoprotein (a) [Lp (a)] and C-reactive protein (CRP) are associated with increased risk of cardiovascular diseases. Objectives: To verify the change in the levels of Lp (a) and ultrasensitive CRP and its relationship with the nutritional status of adolescents. Methods: Cross-sectional study conducted with overweight children and adolescents between August 2012 and July 2013 attended at the Center for Childhood Obesity. The measurement of inflammatory markers was performed in the Clinical Laboratory of the State University of Paraiba. Comparison of sociodemographic variables by sex was tested by chi-square;the association of the risk markers according to age was evaluated by Student’s t test, and the body mass index by analysis of Pearson correlation. The normality distribution was tested by the Kolmogorov-Smirnov test. Confidence interval of 95% was adopted in all analyses. The study was approved by the Ethics Research Committee of UEPB (CAAE 0256.***.133.000-11). Results: Of the 133 children and adolescents evaluated, 60.9% were female and 72.2% were adolescents. Body Mass Index, lipo (a) and u-CRP showed statistically significant association with age (p deeper and long-term investigation should be carried out for more effective and consistent contribution to public health.

关键词： Children Adolescents Obesity Lipoprotein C-Reactive Protein

Homocysteine and Cardiovascular Risk Factors in Overweight or Obese Children and Adolescents

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Health 2015年第3期7卷 381-389页

作者： Adriana Amorim de farias Leal Monica Oliveira da Silva Simoes Alessandra Teixeira Carla Campos muniz Medeiros Astrid Camelo Palmeira Gabriella Menezes Almeida de Castro Mayara Larrys Gomes de Assis Maísa Soares de Oliveira Graduate Program in Public Health State University of ParaibaCampina GrandeBrazil department of Pharmacy State University of ParaibaCampina GrandeBrazil department of Nursing State University of ParaibaCampina GrandeBrazil Scientific Initiation Program State University of ParaibaCampina GrandeBrazil

Introduction: Among the extrinsic factors, homocysteine (Hy) stands out, which is an intermediate amino acid of the intracellular metabolism of methionine involved in the process of cellular oxidation, which promotes the installation of atheromatous plaques and, therefore, is considered as an emerging cardiovascular risk factor. Objective: To evaluate the plasma homocysteine levels (Hy) in overweight or obese children and adolescents and their relation with cardiovascular risk factors. Methods: A cross-sectional study was conducted from July 2011 to May 2012 with overweight or obesity children and adolescents aged 2 to 18 years followed at the Center for Childhood Obesity (IOC), Campina Grande-PB. A structured form was used to record demographic, socioeconomic and clinics variables and the patients underwent laboratory tests to define their lipid and glucose profiles and measurement of plasma Hy levels. Results: The study evaluated a total of 165 children and adolescents with mean age of 12.5 (±2.5) years;the majority were female (57.0%). Regarding the lipid profile, there was more individuals with low HDL cholesterol (88.5%). Plasma Hy levels were high in 24.2% of the sample. The mean Hy levels ranged from 4.3 to 18.9 μmol/L, being higher in males, obese adolescents and also in patients with high insulin levels and resistance. Conclusions: The results shown in this study emphasize the importance of detecting and controlling the plasma Hy levels as an independent cardiovascular risk factor, and the need for further studies to evaluate the clinical and biological factors related to alterations in its metabolism.

关键词： Homocysteine Cardiovascular Diseases Child Adolescent Obesity

The Role of CD4+ and CD8+ T-Cells during Angiostrongylus vasorum Infection in Dogs

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Open Journal of Animal Sciences 2014年第5期4卷 285-290页

作者： Thales Augusto Barcante Lis Ribeiro do Valle Antonelli Kenneth Gollob Thiago Pasqua Narciso Silvio Divino de Oliveira Junior Vitor marcio Ribeiro Ricardo Toshio Fujiwara Ana Paula Peconick debora Negrao-Correa Walter dos Santos Lima Joziana muniz de Paiva Barcante Laboratorio de Biologia Parasitaria(BIOPAR) Departamento de Medicina VeterinariaSetor PreventivaUniversidade Federal de Lavras(UFLA)LavrasBrazil Instituto de Ciencias Biologicas Universidade Federal de Minas GeraisBelo HorizonteBrazil Programa de Pos-graduacao em Ciencias Veterinarias Departamento de Medicina VeterinariaUniversidade Federal de Lavras(UFLA)LavrasBrazil

A determinant factor in the pathology of canine angiostrongylosis seems to be related to the location of the parasite in the definitive host. Their presence inside the arteries and its branches, promoting mechanical and metabolic action on the wall of the vessels, may alter its homeostasis. Bronchoalveolar lavage (BAL) is a procedure that retrieves cells and other elements from de lungs for evaluation, and helps in the diagnosis of many pulmonary diseases. The aim of this study was to evaluate CD4+/CD8+ lymphocyte profile during the infection by Angiostrongylus vasorum, using cells retrieved using BAL. The identification of subpopulations of T lymphocytes by evaluating the co-expression of CD4 and CD8 receptor proteins has shown that despite the increase in both populations, there was a predominance of CD4+ T-cells, instead of CD8+ T-cells. These increases of CD4+ T-cells associated with the increase of the ratio between CD4+/CD8+ suggest polarization of a Th2 response. However, the immune cells, signaling factors, and cytokines that mediate such immunity and how and where they act within the body remain largely undefined during angiostrongylosis.

关键词： Citometria Angiostrongyliasis Brochoalveolar Lavage

Influence of Environmental and Microclimate Factors on the Coffee Beans Quality (C. canephora): Correlation between Chemical Analysis and Stable Free Radicals

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Agricultural Sciences 2018年第9期9卷 1173-1187页

作者： AndréLuíz Alves marcio Solino Pessoa Paulo Eduardo Narcizo de Souza Fábio Luís Partelli Paulo Sérgio Moscon Edson Correa da Silva André Oliveira Guimaraes Eduardo Perini muniz Patrícia Fontes Pinheiro Flávio Meira Borém Paulo César Morais departamento de Ciências Naturais Universidade Federal do Espírito SantoCentro Universitário Norte do Espírito SantoSao MateusBrazil Universidade de Brasília Instituto de FísicaNúcleo de Física AplicadaBrasília DFBrazil Laboratório de Ciências Físicas Centro de Ciências e TecnologiaUniversidade Estadual Norte FluminenseCampos dos GoytacasesBrazil departamento de Química e Física Universidade Federal do Espírito SantoAlto UniversitárioAlegreBrazil departamento de Engenharia Universidade Federal de LavrasLavrasBrazil School of Chemistry and Chemical Engineering Anhui UniversityHefeiChina

The present study reports a physicochemical comparison of shade-grown and sun-grown coffee beans, under unripe, rip and roasted-ripe conditions, using electrical conductivity measurements, electron paramagnetic resonance (EPR), infrared spectroscopy (FTIR), and high performance liquid chromatography (HPLC). Moreover, the assessed physicochemical parameters were compared with organoleptic evaluations based on the Coffee Quality Institute protocol. The values found for electrical conductivity, leached potassium, and stable free radicals were respectively 29%, 31%, and 350% higher for shade-grown coffee beans, whereas polyphenol oxidase enzymatic activity was 23% lower. By contrast, FTIR and HPLC measurements identified higher chlorogenic acid and lipid contents in sun-grown coffee beans. Importantly, the sensorial grade attributed to roasted-ripe grains was 12% higher for sun-grown coffee. Our findings suggest that shade-grown coffee beans have undergone microorganismal activity and undesired fermentation during cultivation, which resulted in lower coffee quality. A correlation between a set of selected physicochemical properties and organoleptic properties was robustly established and could be used in the development of future coffee bean quality control protocols.

关键词： Sun-Grown Coffee Shade-Grown Coffee Fermentation EPR FTIR HPLC