Search results for " elastic modulus"

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A New Sampling Method for Spleen Stiffness Measurement Based on Quantitative Acoustic Radiation Force Impulse Elastography for Noninvasive Assessment…

2014

In our study, we evaluated the feasibility of a new sampling method for splenic stiffness (SS) measurement by Quantitative Acoustic Radiation Force Impulse Elastography (Virtual Touch Tissue Quantification (VTTQ)).We measured SS in 54 patients with HCV-related cirrhosis of whom 28 with esophageal varices (EV), 27 with Chronic Hepatitis C (CHC) F1–F3, and 63 healthy controls. VTTQ-SS was significantly higher among cirrhotic patients with EV (3.37 m/s) in comparison with controls (2.19 m/s,P<0.001), CHC patients (2.37 m/s,P<0.001), and cirrhotic patients without EV (2.7 m/s,P<0.001). Moreover, VTTQ-SS was significantly higher among cirrhotic patients without EV in comparison with bot…

Liver CirrhosisMaleGenetics and Molecular Biology (all)CirrhosisData InterpretationImmunology and Microbiology (all)lcsh:MedicineVarices assessementLikelihood ratios in diagnostic testingGastroenterologyBiochemistryEsophageal varicesComputer-AssistedUltrasonographymedicine.diagnostic_testAUROCMedicine (all)General MedicineHepatitis CStatisticalMiddle AgedHepatitis CCirrhosisData Interpretation StatisticalFemaleElastographyViral hepatitisAlgorithmsAged; Algorithms; Data Interpretation Statistical; Elastic Modulus; Esophageal and Gastric Varices; Female; Hepatitis C; Humans; Image Interpretation Computer-Assisted; Liver Cirrhosis; Male; Middle Aged; Reproducibility of Results; Sample Size; Sensitivity and Specificity; Spleen; Stress Mechanical; Biochemistry Genetics and Molecular Biology (all); Immunology and Microbiology (all); Medicine (all)medicine.medical_specialtyArticle SubjectEsophageal and Gastric VaricesStressSensitivity and SpecificityGeneral Biochemistry Genetics and Molecular BiologyInternal medicineElastic ModulusImage Interpretation Computer-AssistedmedicineHumansAcoustic radiation forceImage InterpretationAgedGeneral Immunology and Microbiologybusiness.industrylcsh:RReproducibility of Resultsmedicine.diseaseMechanicalEndoscopySample SizeClinical StudyStress MechanicalbusinessSpleen
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Accurately evaluating Young’s modulus of polymers through nanoindentations: a phenomenological correction factor to the Oliver and Pharr procedure

2006

The Oliver and Pharr [J. Mater. Res. 7, 1564 (1992)] procedure is a widely used tool to analyze nanoindentation force curves obtained on metals or ceramics. Its application to polymers is, however, difficult, as Young’s moduli are commonly overestimated mainly because of viscoelastic effects and pileup. However, polymers spanning a large range of morphologies have been used in this work to introduce a phenomenological correction factor. It depends on indenter geometry: sets of calibration indentations have to be performed on some polymers with known elastic moduli to characterize each indenter.

chemistry.chemical_classificationMaterials sciencePhysics and Astronomy (miscellaneous)Young's modulusLarge rangePolymernanoindentation elastic modulus polymersNanoindentationViscoelasticityModulisymbols.namesakeSettore ING-IND/22 - Scienza E Tecnologia Dei MaterialiClassical mechanicschemistryIndentationsymbolsComposite materialElastic modulus
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