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Measurements of elastic properties and their dependencies within a damage mechanics workflow

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Rock Mechanics Bulletin

Rock Mechanics Bulletin 2023年第4期2卷 84-94页

作者： Erik PKnippel Qiquan Xiong ana Paula Villaquiran vargas Jesse C.Hampton Geomechanics and Damage Group(GeoD) Department of Civil and Environmental EngineeringUniversity of Wisconsin-MadisonUSA

Experimental rock mechanics testing provides a controlled and effective method for measuring physical properties,their dependencies,and their evolution due to the addition of localized *** understand the contributions of microcracks to first order changes in compliance,the behavior of initial undamaged properties of a material should be comprehensively investigated as a function of stress,load path,and load *** perform a comprehensive study of elastic properties and their dependence on a variety of materials exhibiting nonlinearity,and varying levels of anisotropy in elastic *** programmatically perturb the testing environment of the specimens under triaxial *** moduli are measured within each test,and along multiple discrete loading paths for multistage tests as a function of stress,focusing on a set launch *** single stage triaxial tests per rock type are performed to calculate Mohr-Coulomb failure criteria,and ultrasonic velocities are captured during compression for establishing the upper bound of elastic *** wave velocity for granite experiences a maximum value at a lower differential stress than maximum volumetric *** displays a similar trend at the highest confining pressure,while these two maxima converge under the lowest confining pressure.

关键词： Triaxial test Elastic moduli Ultrasonic measurements Damage mechanics Rock nonlinear behavior

Incidental findings of Cysticercus tenuicollis metacestodes in five oryx species

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Asian Pacific Journal of Tropical Biomedicine 2016年第1期6卷 90-92页

作者： Stephen Chege Arshad Toosy Ahmed Sakr Ahmed Shawki Sean O'Sullivan ana Perez de vargas Tatiana Cavero Amir Islam Al Ain Zoo Life Sciences Department

Objective:To determine the prevalence of Cysticercus tenuicollis(***) metacestodes in five oryx species kept in A1 Ain Zoo animal ***:This study was based on a retrospective analysis of post-mortem records covering a four year period(July 2010 to July 2014).Results:A total of 213 individual animals were recorded dead during the four year period(July 2010 to July 2014).Out of this,12(5.6%) were recorded with *** females(8) than males(4) were recorded to have ***,although this was not statistically significant(P= 0.3737).Conclusions:This study shows that,Arabian oryx,beisa oryx,fringe-eared oryx,gemsbok and scimitar-horned oryx are susceptible to *** on the epidemiology and the life cycle of this parasite,it is possible that these captive animals ingested the parasite through contaminated feed which could have happened in the pasture land or stray dogs and wild canidae(***) visited the zoo contaminating the oryx *** dogs and wild canidae should be prevented from visiting pasture land and a captive animal facility.

关键词： Al Ain Zoo Arabian oryx Beisa oryx Cysticercus tenuicollis Fringe-eared oryx Gemsbok Mortality records Scimitar-horned oryx Taenia hydatigena

Extracorporeal shock wave for plantar flexor spasticity in spinal cord injury:A case report and review of literature

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World Journal of Clinical Cases 2023年第1期11卷 127-134页

作者： Natalia Comino-Suárez Julio Gómez-Soriano Silvia Ceruelo-Abajo Eduardo vargas-Baquero ana Esclarín Juan Avendaño-Coy Toledo Physiotherapy Research Group Faculty of Physiotherapy and NurseryCastilla La Mancha UniversityToledo 45071ToledoSpain Department of Physical and Rehabilitation Medicine Hospital Nacional de ParapléjicosSescamToledo 45071ToledoSpain

BACKGROUND Approximately 65%-78%of patients with a spinal cord injury(SCI)develop any symptom of *** aim of this study was to investigate the tolerability and short-term effects of radial extracorporeal shock wave therapy(r ESWT)on plantar flexor spasticity in a patient with incomplete *** SUMMARY An 18-year-old man with an incomplete SCI completed five sessions of r *** primary outcomes were the changes in ankle-passive range of motion(APROM)and passive resistive force to ankle *** outcomes were assessed at baseline(T0),immediately after treatment(T1)and 1 wk after the end of treatment(T2).The A-PROM increased by 15 degrees at T1 and 25 degrees at T2 compared with *** passive resistive force to ankle dorsiflexion at low velocity decreased by 33%at T1 and 55%at T2 in the gastrocnemius muscle and by 41%at T1 and 39%at T2 in the soleus muscle compared with *** high velocity,it also decreased by 44%at T1 and 30%at T2 in the gastrocnemius muscle compared with ***,in the soleus muscle,the change was minor,with a decrease of 12%at T1 and increased by 39%at T2 compared with *** In this patient,the findings showed that r ESWT combined with conventional therapy was well-tolerated and could be effective in improving A-PROM and passive resistive force to ankle dorsiflexion in the *** randomized controlled clinical trials with longer period of follow-up are necessary to confirm the results obtained in patients with SCI.

关键词： Spasticity Spinal cord injury Radial extracorporeal shock wave therapy Rehabilitation Case report

Ambient Air Particulate PM2.5 Concentrations and Identification of Source Categories at Chihuahua, Mexico

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Journal of Environmental Science and Engineering(A) 2013年第3期2卷 147-154页

作者： ana Canseco-Lajas Ramon Gomez vargas Alfredo Campos-Trujillo Department of Environment and Energy Advanced Materials Research Center Chihuahua 31109 Mexieo

Suspended particles in the air are pollutants formed by diverse materials and sizes. As determined in multiple studies, particulate matter equal to or less than 2.5 μrn also called breathable fraction is the one that penetrates the inferior respiratory system. The present study shows the results of a sampling campaign of particulate matter PM25 through 12 months at 3 sites： C33 （Clinic 33）, CIM （CIMAV） and A VA （Avalos） at Chihuahua, Mexico. The aim of this study was to determine the temporary concentrations of PM25, the concentration of metallic elements： Al, As, Co, Cu, Sb, Se, Fe, Mg, Mn, Ni, Pb and Zn, as well as their possible sources. The three sites had the same trend in the time, where in autumn and winter the higher concentrations were found. The yearly averages on sites C33, CIM, and AVA were 9.91, 12.74 and 21.67 μg·m^-3, respectively, finding that AVA site overpasses the standard of 15 μg·m^-3. The application of factor analysis to the data allowed to identify four source categories： crustal, related with Al-Co-Fe-Mg-Mn, vehicular, related with： As-Cu-Sb-Se; mixed, related with： As-Cu-Sb-Se-Pb-Zn and industrial related with Ni-Pb.

关键词： PM25 trace metallic elements factor analysis source categories.

Machine learning insights concerning inflammatory and liver-related risk comorbidities in non-communicable and viral diseases

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World Journal of Gastroenterology 2022年第44期28卷 6230-6248页

作者： J Alfredo Martínez Marta Alonso-Bernáldez Diego Martínez-Urbistondo Juan A vargas-Nuñez ana Ramírezde Molina Alberto Dávalos Omar Ramos-Lopez Precision Nutrition and Cardiometabolic Health Madrid Institute of Advanced Studies-Food InstituteMadrid 28049Spain Department of Internal Medicine Hospital Universitario HM SanchinarroMadrid 28050Spain Servicio de Medicina Interna Hospital Universitario Puerta de Hierro MajadahondaMadrid 28222MajadahondaSpain Molecular Oncology and Nutritional Genomics of Cancer Madrid Institute of Advanced Studies-Food InstituteMadrid 28049Spain Laboratory of Epigenetics of Lipid Metabolism Madrid Institute of Advanced Studies-Food InstituteMadrid 28049Spain Medicine and Psychology School Autonomous University of Baja CaliforniaTijuana 22390Baja CaliforniaMexico

The liver is a key organ involved in a wide range of functions,whose damage can lead to chronic liver disease(CLD).CLD accounts for more than two million deaths worldwide,becoming a social and economic burden for most *** the different factors that can cause CLD,alcohol abuse,viruses,drug treatments,and unhealthy dietary patterns top the *** conditions prompt and perpetuate an inflammatory environment and oxidative stress imbalance that favor the development of hepatic *** stages of fibrosis can eventually lead to cirrhosis or hepatocellular carcinoma(HCC).Despite the advances achieved in this field,new approaches are needed for the prevention,diagnosis,treatment,and prognosis of *** this context,the scientific community is using machine learning(ML)algorithms to integrate and process vast amounts of data with unprecedented *** techniques allow the integration of anthropometric,genetic,clinical,biochemical,dietary,lifestyle and omics data,giving new insights to tackle CLD and bringing personalized medicine a step *** review summarizes the investigations where ML techniques have been applied to study new approaches that could be used in inflammatoryrelated,hepatitis viruses-induced,and coronavirus disease 2019-induced liver damage and enlighten the factors involved in CLD development.

关键词： Machine learning Liver inflammation Liver disease Viral diseases Comorbidity

Is magnesium deficiency the major cause of needle chlorosis of Pinus taeda in Brazil?

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Journal of Forestry Research 2024年第2期35卷 209-221页

作者： Antônio Carlos vargas Motta Shizuo Maeda Valdécio dos Santos dos Santos Rodrigues Tamires Maiara Ercole Stephen Arthur Prior ana Elisa Lyra Brumat Amanda Pacheco Cardoso Moura Julierme Zimmer Barbosa João Bosco Vasconcellos Gomes Department of Soil Sciences and Agriculture Engineering Federal University of ParanáR.dos Funcionários1540.CuritibaParanáCEP 80035‑050Brazil Brazilian Agricultural Research Company Embrapa FlorestasEstr.da Ribeira–Br‑476Km 111–Parque Monte Castelo.ColomboParanáCEP 83411‑000Brazil United States Department of Agriculture‑Agricultural Research Service USDA-ARS National Soil Dynamics Laboratory411 South Donahue DriveAuburnAL 36832USA Reforestation Remasa Rodovia PR 170–Km 522.BiturunaParanáCEP 84640‑000Brazil Federal Institute of Southeast of Minas Gerais R.Luz Interior360.Juiz de ForaMinas Gerais CEP 36030‑713Brazil

Needle chlorosis(NC)in Pinus taeda *** in Brazil becomes more frequent after second and third harvest rotation *** a study to identify factors contributing to yellowing needle chorosis(YNC),trees were grown in soils originating from contrasting parent materials,and soils and needles(whole,green and chlorotic portions)from 1-and 2-year-old branches and the first and second needle flush release at four sites with YNC on *** were analyzed for various elements and *** soils had very low base levels(Ca^(2+),Mg^(2+)and K^(+))and P,suggesting a possible lack of multiple *** symptoms started at needle tips,then extended toward the needle base with *** flush needles had longer portions with YNC than second flush needles *** from the lower crown also had more symptoms along their length than those higher in the *** were similar to those reported for *** chlorotic portions,Mg and Ca concentrations were well below critical values;in particular,Mg levels were only one third of the critical value of 0.3 g kg^(-1).Collectively,results suggest that Mg deficiency is the primary reason for NC of *** in various parent soils in Brazil.

关键词： Nutritional deficiency Forest management Soil depletion Pine foliar analysis Needle chlorosis

Risk assessment of CO_2 injection processes and storage in carboniferous formations:a review

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Journal of Rock Mechanics and Geotechnical Engineering 2011年第1期3卷 39-56页

作者： Sousa Luis Sousa Rita Gomes ana vargas Jr.Eurípedes State Key Laboratory for Geomechanics and Deep Underground Engineering China University of Mining and Technology University of Porto Massachusetts Institute of Technology Catholic University of Rio de Janeiro

Over the last decades,people from almost all over the world have realized that it is necessary to quickly develop strategies for the control and reduction of greenhouse gases (GHG) *** various GHGs,carbon dioxide (CO2) is the most abundant *** underground storage involves less risk and lower levels of *** paper briefly describes the most effective technologies available in the market for background processes to storage (capture and transport) CO2,as well as the more secure solutions for its storage,in particular for the geological storage in carboniferous *** paper also outlines the methodologies for the risk assessment involved in storage of CO2,with a particular focus on cases where the injection is made into unminable coal seams and in abandoned *** used for risk analysis are described in detail with particular emphasis on Bayesian network (BN).Some applications regarding the risk assessment of CO2 injection processes and CO2 storage in carboniferous formations and contamination of aquifers are presented and ***,based on the applications of BN,several conclusions are drawn.

关键词： risk assessment underground storage of CO2 coalmines monitoring

Diagnostic neuroradiology for the interventional neuroradiologist

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World Journal of Radiology 2013年第11期5卷 386-397页

作者： Vitor Mendes Pereira Maria Isabel vargas ana Marcos Philippe Bijlenga ana Paula Narata Sven Haller Karl-Olof Lvblad Service Neuro-diagnostique et Neuro-interventionnel Geneva University Hospitals Service de Neurochirurgie HUG Geneva University Hospitals

In order to further improve the impact of the continuously evolving neurointerventional techniques, the interventional neuroradiologist needs to have at his disposal more powerful techniques to image the central nervous system. With the recent development of diagnostics techniques that are computed tomography and magnetic resonance based we are now able to assess not just morphology, but also physiology, physiopathology and function. This review discusses the place of diagnostic techniques in the evaluation that the interventional neuroradiologist hast to make when confronted with patients. We provide an overview of current techniques for the brain and spine.

关键词： Neuroradiology Brain Imaging Magnetic resonance Interventional radiology

Cell therapy stimulates bone neoformation in calvaria defects in rats subjected to local irradiation

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Animal Models and Experimental Medicine 2019年第3期2卷 169-177页

作者： ana Luisa Riul Sorio Paula Katherine vargas‐Sanchez Roger Rodrigo Fernandes Dimitrius Leonardo Pitol Luiz Gustavo de Sousa Adriano Luiz Balthazar Bianchini Geraldo Batista de Melo Selma Siessere Karina Fittipaldi Bombonato‐Prado Department of Basic and Oral Biology School of Dentistry of Ribeirao PretoUniversity of Sao PauloRibeirao PretoSPBrazil Department of Radiotherapy Triangulo Mineiro Federal UniversityUberabaMinas GeraisBrazil Biomedical Sciences Institute Federal University of UberlandiaUberlandiaMinas GeraisBrazil

Background:The purpose of the study was to analyze the effect of cell therapy on the repair process in calvaria defects in rats subjected to ***:Bone marrow mesenchymal cells were characterized for osteoblastic *** of male Wistar rats were irradiated(20 Gy)and,after 4 weeks,osteoblastic cells were placed in surgically created defects in irradiated(IRC)and control animals(CC),paired with untreated irradiated(IR)and control(C)*** 30 days,histological and microtomographic evaluation was performed to establish significant(P<0.05)differences among the ***:Higher alkaline phosphatase detection and activity,along with an increase in mineralized nodules,in the IRC,C and CC groups compared to the IR group,confirmed an osteoblastic *** showed impaired bone neoformation following irradiation,affecting bone marrow *** therapy in the IRC group improved bone neoformation compared to the IR *** revealed increased bone volume,bone surface and trabecular number in IRC group compared to the IR ***:Cell therapy may improve bone neoformation in defects created after irradiation.

关键词： calvaria cell therapy irradiation osteoblasts rats