keyword
MENU ▼
Read by QxMD icon Read
search

FEA

keyword
https://www.readbyqxmd.com/read/29161620/in-situ-elastic-strain-mapping-during-micromechanical-testing-using-ebsd
#1
Mark J McLean, William A Osborn
Compared to more commonly used strain measurement techniques, electron backscatter diffraction (EBSD) offers improved spatial resolution and measurement sensitivity. Additionally, EBSD can provide the full deformation tensor, whereas other techniques, such as digital image correlation (DIC), are limited to only in-plane strains and rotations. In this work, EBSD was used to measure strains and rotations in-situ during testing of a single-crystal silicon micromechanical test specimen. The theta-like specimen geometry was chosen due to the complex and spatially-varying strain states that exist in the circular frame of the sample during testing, as well as the nominally uniform strains in the central web...
November 14, 2017: Ultramicroscopy
https://www.readbyqxmd.com/read/29160242/angular-dependent-magnetoresistance-study-in-ca-sub-0-73-sub-la-sub-0-27-sub-feas-sub-2-sub-a-i-parent-i-compound-of-112-type-iron-pnictide-superconductors
#2
Xiangzhuo Xing, Chunqiang Xu, Zhanfeng Li, Jiajia Feng, Nan Zhou, Yufeng Zhang, Yue Sun, Wei Zhou, Xiaofeng Xu, Zhixiang Shi
We report a study of angular-dependent magnetoresistance (AMR) with the magnetic field rotated in the plane perpendicular to the current on a Ca<sub>0.73</sub>La<sub>0.27</sub>FeAs<sub>2</sub> single crystal, which is regarded as a "<i>parent</i>" compound of 112-type iron pnictide superconductors. A pronounced AMR with twofold symmetry is observed, signifying the highly anisotropic Fermi surface. By further analyzing the AMR data, we find that the Fermi surface above the structural/antiferromagnetic (AFM) transition (<i>T</i><sub>s</sub>/<i>T</i><sub>N</sub>) is quasi-two-dimensional (2D), as revealed by the 2D scaling behavior of the AMR, Δρ/ρ(0) (<i>H</i>, θ)=Δρ/ρ(0) (μ<sub>0</sub><i>H</i>cos<i>θ</i>), <i>θ</i> being the magnetic field angle with respect to the c axis...
November 21, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/29156345/the-extended-production-of-uv-induced-reactive-oxygen-species-in-l929-fibroblasts-is-attenuated-by-posttreatment-with-arrabidaea-chica-through-scavenging-mechanisms
#3
Fabianne Martins Ribeiro, Hélito Volpato, Danielle Lazarin-Bidóia, Vânia Cristina Desoti, Rebeca Oliveira de Souza, Maria José Vieira Fonseca, Tânia Ueda-Nakamura, Celso Vataru Nakamura, Sueli de Oliveira Silva
Ultraviolet radiation (UVR) exposure causes various injurious effects to human skin by generating reactive oxygen species (ROS). Excessive ROS production can lead to oxidative stress which may damage cellular components like lipids and proteins and causing photoaging. The use of natural photochemopreventive agents with antioxidant properties is an important alternative to improve the effectiveness of sunscreens and reduce skin photodamage. A crude extract (CE) from the leaves of Arrabidaea chica underwent partition by a liquid-liquid method...
November 17, 2017: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/29141673/a-customized-fixation-plate-with-novel-structure-designed-by-topological-optimization-for-mandibular-angle-fracture-based-on-finite-element-analysis
#4
Yun-Feng Liu, Ying-Ying Fan, Xian-Feng Jiang, Dale A Baur
BACKGROUND: The purpose of this study was to design a customized fixation plate for mandibular angle fracture using topological optimization based on the biomechanical properties of the two conventional fixation systems, and compare the results of stress, strain and displacement distributions calculated by finite element analysis (FEA). METHODS: A three-dimensional (3D) virtual mandible was reconstructed from CT images with a mimic angle fracture and a 1 mm gap between two bone segments, and then a FEA model, including volume mesh with inhomogeneous bone material properties, three loading conditions and constraints (muscles and condyles), was created to design a customized plate using topological optimization method, then the shape of the plate was referenced from the stress concentrated area on an initial part created from thickened bone surface for optimal calculation, and then the plate was formulated as "V" pattern according to dimensions of standard mini-plate finally...
November 15, 2017: Biomedical Engineering Online
https://www.readbyqxmd.com/read/29140377/influence-of-the-prosthetic-index-on-fracture-resistance-of-morse-taper-dental-implants
#5
Karla Zancopé, Caio César Dias Resende, Carolina Guimarães Castro, Rafael Calixto Salatti, Flávio Domingues das Neves
PURPOSE: Manufacturers have inserted a prosthetic index, an internal hexagon to guide prosthetic components inside Morse taper implants. However, it is still unclear if this mechanism could decrease the mechanical strength of Morse taper implants. The aim of this study was to evaluate the influence of the prosthetic index inside Morse taper implants on fracture resistance compared with nonindexed implants. MATERIALS AND METHODS: Fifty-seven Morse taper implants, with 11...
November 2017: International Journal of Oral & Maxillofacial Implants
https://www.readbyqxmd.com/read/29128350/biomechanical-behavior-of-adhesive-cement-layer-and-periodontal-tissues-on-the-restored-teeth-with-zirconia-rbfdps-using-three-kinds-of-framework-design-3d-fea-study
#6
Ayana Uraba, Reina Nemoto, Kosuke Nozaki, Tasuku Inagaki, Satoshi Omori, Hiroyuki Miura
PURPOSE: To investigate stress and strain concentrations on resin-bonded fixed dental prostheses (RBFDPs) frameworks of different design using finite element analysis. METHODS: A human dry skull was scanned and models were produced using three-dimensional printer. After abutment preparation, three frameworks, including a three-unit RBFDP, and two-unit cantilevered RBFDPs using #21 and #23 for the abutment tooth, were fabricated. Scanned data were subtracted to define boundary of each structure...
November 8, 2017: Journal of Prosthodontic Research
https://www.readbyqxmd.com/read/29128128/cad-fe-modeling-and-analysis-of-class-ii-restorations-incorporating-resin-composite-glass-ionomer-and-glass-ceramic-materials
#7
Pietro Ausiello, Stefano Ciaramella, Massimo Martorelli, Antonio Lanzotti, Antonio Gloria, David C Watts
OBJECTIVES: To investigate the influence of specific resin-composite, glass ceramic and glass ionomer cement (GIC) material combinations in a "multi-layer" technique to replace enamel and dentin in class II mesio-occlusal-distal (MOD) dental restorations using 3D-Finite Element Analysis (FEA). METHODS: Four 3D-FE models (A-D) of teeth, adhesively restored with different filling materials, were created and analyzed in comparison with a 3D model (E) of a sound lower molar...
November 8, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/29122615/ultrastructural-and-molecular-characterization-of-vairimorpha-austropotamobii-sp-nov-microsporidia-burenellidae-and-thelohania-contejeani-microsporidia-thelohaniidae-two-parasites-of-the-white-clawed-crayfish-austropotamobius-pallipes-complex-decapoda-astacidae
#8
Tobia Pretto, Francesco Montesi, Daniela Ghia, Valeria Berton, Miriam Abbadi, Michele Gastaldelli, Amedeo Manfrin, Gianluca Fea
The microsporidiosis of the endangered white-clawed crayfish Austropotamobius pallipes complex has generally been attributed to only one species, Thelohania contejeani, the agent of porcelain disease. Species identification was mostly assessed by macroscopic examination or microscopic evaluation of muscle samples rather than by molecular or ultrastructural analyses. A survey conducted on A. pallipes complex populations in Northern Italy highlighted the presence of two different microsporidia causing similar muscular lesions, T...
November 6, 2017: Journal of Invertebrate Pathology
https://www.readbyqxmd.com/read/29120865/doping-effect-on-the-physical-properties-of-ca10pt3as8-fe2as2-5-single-crystals
#9
Jiayun Pan, Amar Karki, E W Plummer, Rongying Jin
Ca10Pt3As8(Fe2As2)5 is a unique parent compound for superconductivity, which consists of both semiconducting Pt3As8 and metallic FeAs layers. We report the observation of superconductivity induced via chemical doping in either Ca site using rare-earth (RE) elements (RE  =  La, Gd) or Fe site using Pt. The interlayer distance and the normal-state physical properties of the doped system change correspondingly. The coupled changes include (1) superconducting transition temperature T c increases with increasing both doping concentration and interlayer distance, (2) our T c value is higher than previously reported maximum value for Pt doping in the Fe site, (3) both the normal-state in-plane resistivity and out-of-plane resistivity change from non-metallic to metallic behavior with increasing doping concentration and T c, and (4) the transverse in-plane magnetoresistance (MRab) changes from linear-field dependence to quadratic behavior upon increasing T c...
November 9, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/29100673/flat-epithelial-atypia-upgrade-rates-and-risk-stratification-approach-to-support-informed-decision-making
#10
Leslie R Lamb, Manisha Bahl, Michele A Gadd, Constance D Lehman
BACKGROUND: Our aim was to determine upgrade rates of pure flat epithelial atypia (FEA) to malignancy and higher-risk lesions and to identify patients with FEA at low risk for upgrade. STUDY DESIGN: Medical chart review from 2007 to 2016 identified 208 consecutive patients with pure FEA diagnosed by image-guided core needle biopsy who underwent surgical excision (96.2% [200 of 208]) or had at least 2 years of imaging follow-up (3.8% [8 of 208]). Medical records were reviewed for risk factors and surgical outcomes...
September 27, 2017: Journal of the American College of Surgeons
https://www.readbyqxmd.com/read/29095963/comparative-evaluation-of-a-four-implant-supported-polyetherketoneketone-framework-prosthesis-a-three-dimensional-finite-element-analysis-based-on-cone-beam-computed-tomography-and-computer-aided-design
#11
Ki-Sun Lee, Sang-Wan Shin, Sang-Pyo Lee, Jong-Eun Kim, Jee-Hwan Kim, Jeong-Yol Lee
PURPOSE: The purpose of this pilot study was to evaluate and compare polyetherketoneketone (PEKK) with different framework materials for implant-supported prostheses by means of a three-dimensional finite element analysis (3D-FEA) based on cone beam computed tomography (CBCT) and computer-aided design (CAD) data. MATERIALS AND METHODS: A geometric model that consisted of four maxillary implants supporting a prosthesis framework was constructed from CBCT and CAD data of a treated patient...
November 2017: International Journal of Prosthodontics
https://www.readbyqxmd.com/read/29072858/flat-epithelial-atypia-conservative-management-of-patients-without-residual-microcalcifications-post-vacuum-assisted-breast-biopsy
#12
Simone Schiaffino, Licia Gristina, Alessandro Villa, Simona Tosto, Francesco Monetti, Franca Carli, Massimo Calabrese
OBJECTIVE: To determine the malignancy rate (defined in this study as stability or absence of malignancy developed on close imaging follow-up post-biopsy) of conservative management in patients with a vacuum-assisted breast biopsy (VAB) diagnosis of flat epithelial atypia (FEA), performed on single group of microcalcifications, completely removed during procedure. METHODS: This is a retrospective, monocentric, observational study, approved by IRB. Inclusion criteria were: VAB performed on a single group of microcalcifications; the absence of residual calcifications post-VAB; diagnosis of isolated FEA as the most advanced proliferative lesion; radiological follow-up at least of 12 months...
November 9, 2017: British Journal of Radiology
https://www.readbyqxmd.com/read/29072241/oxidative-stress-markers-and-genetic-polymorphisms-of-glutathione-s-transferase-t1-m1-and-p1-in-a-subset-of-children-with-autism-spectrum-disorder-in-lagos-nigeria
#13
Y Oshodi, O Ojewunmi, T A Oshodi, G T Ijarogbe, O C Ogun, O F Aina, Fea Lesi
BACKGROUND: The role of oxidative stress has been identified in the development of autism spectrum disorder (ASD), and polymorphisms of glutathione S-transferase have been associated with some diseases linked to oxidative stress. Hence, we evaluated the serum levels of oxidative stress markers and investigated genetic polymorphisms of glutathione S-transferase associated with autism. MATERIALS AND METHODS: Forty-two children clinically diagnosed with ASD using the Diagnostic and Statistical Manual for Mental Disorders (DSM-5) criteria and a clinical interview were included in the study...
September 2017: Nigerian Journal of Clinical Practice
https://www.readbyqxmd.com/read/29068580/orthodontic-intrusion-of-periodontally-compromised-maxillary-incisors-3-dimensional-finite-element-method-analysis
#14
Liwia E Minch, Michał Sarul, Rafał Nowak, Beata Kawala, Joanna Antoszewska-Smith
BACKGROUND: Loading of the compromised periodontium with orthodontic forces produces different results than those achieved in patients with healthy periodontal support. Determining the force value at a level preventing further deterioration of the patient's periodontal status, thus delivering the most precisely individualized "dose" of loading, seems to be crucial for the successful intrusion of teeth with reduced periodontal support. OBJECTIVES: The aim of the study was to determine the range of force values efficiently intruding maxillary incisors without further compromising the initially-impaired periodontal status...
August 2017: Advances in Clinical and Experimental Medicine: Official Organ Wroclaw Medical University
https://www.readbyqxmd.com/read/29065624/effects-of-scan-resolutions-and-element-sizes-on-bovine-vertebral-mechanical-parameters-from-quantitative-computed-tomography-based-finite-element-analysis
#15
Meng Zhang, Jiazi Gao, Xu Huang, He Gong, Min Zhang, Bei Liu
Quantitative computed tomography-based finite element analysis (QCT/FEA) has been developed to predict vertebral strength. However, QCT/FEA models may be different with scan resolutions and element sizes. The aim of this study was to explore the effects of scan resolutions and element sizes on QCT/FEA outcomes. Nine bovine vertebral bodies were scanned using the clinical CT scanner and reconstructed from datasets with the two-slice thickness, that is, 0.6 mm (PA resolution) and 1 mm (PB resolution). There were significantly linear correlations between the predicted and measured principal strains (R(2) > 0...
2017: Journal of Healthcare Engineering
https://www.readbyqxmd.com/read/29065610/hollow-abutment-screw-design-for-easy-retrieval-in-case-of-screw-fracture-in-dental-implant-system
#16
Bo Kyun Sim, Bongju Kim, Min Jeong Kim, Guk Hyun Jeong, Kyung Won Ju, Yoo Jin Shin, Man Yong Kim, Jong-Ho Lee
The prosthetic component of dental implant is attached on the abutment which is connected to the fixture with an abutment screw. The abutment screw fracture is not frequent; however, the retrieval of the fractured screw is not easy, and it poses complications. A retrieval kit was developed which utilizes screw removal drills to make a hole on the fractured screw that provides an engaging drill to unscrew it. To minimize this process, the abutment screw is modified with a prefabricated access hole for easy retrieval...
2017: Journal of Healthcare Engineering
https://www.readbyqxmd.com/read/29063862/doping-effect-on-the-physical-properties-of-ca-sub-10-sub-pt-sub-3-sub-as-sub-8-sub-fe-sub-2-sub-as-sub-2-sub-sub-5-sub-single-crystals
#17
Jiayun Pan, Amar Karki, E Ward Plummer, Rongying Jin
Ca10Pt3As8(Fe2As2)5 is a unique parent compound for superconductivity, which consists of both semiconducting Pt3As8 and metallic FeAs layers. We report the observation of superconductivity induced via chemical doping in either Ca site using rare-earth (RE) elements (RE = La, Gd) or Fe site using Pt. The interlayer distance and the normal-state physical properties of the doped system change correspondingly. The coupled changes include (1) superconducting transition temperature T_c increases with increasing both doping concentration and interlayer distance, (2) our Tc value is higher than previously reported maximum value for Pt doping in the Fe site, (3) both the normal-state in-plane resistivity and out-of-plane resistivity change from non-metallic to metallic behavior with increasing doping concentration and Tc, and (4) the transverse in-plane magnetoresistance (MRab) changes from linear-field dependence to quadratic behavior upon increasing Tc...
October 24, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/29061390/integrated-geometric-and-mechanical-analysis-of-an-image-based-lymphatic-valve
#18
Daniel J Watson, Igor Sazonov, David C Zawieja, James E Moore, Raoul van Loon
Lymphatic valves facilitate the lymphatic system's role in maintaining fluid homeostasis. Malformed valves are found in several forms of primary lymphœdema, resulting in incurable swelling of the tissues and immune dysfunction. Their experimental study is complicated by their small size and operation in low pressure and low Reynolds number environments. Mathematical models of these structures can give insight and complement experimentation. In this work, we present the first valve geometry reconstructed from confocal imagery and used in the construction of a subject-specific model in a closing mode...
October 7, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/29060279/a-wireless-batteryless-implantable-radiofrequency-lesioning-device-powered-by-intermediate-range-segmented-coil-transmitter
#19
Sai Chun Tang, Nathan J McDannold, Michael Vaninetti
A batteryless implantable radiofrequency lesioning (RFL) device powered by magnetic coupling is presented. The implant is composed of bipolar RFL electrodes, an energy-receiving coil, and a resonant capacitor circuit for maximizing the received power and providing an appropriate voltage for the electrodes. A 40-cm transmitting coil designed to wrap around the patient's body is used to generate a uniform magnetic field in a large volume so precise coil alignment is not necessary. The transmitting coil is divided to 24 segments by resonant capacitors to significantly reduce the excitation voltage to a safe level...
July 2017: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/29046239/increased-peak-wall-stress-but-not-maximum-diameter-is-associated-with-symptomatic-abdominal-aortic-aneurysm
#20
Begoña Soto, Luis Vila, Jaime F Dilmé, Jose R Escudero, Sergi Bellmunt, Mercedes Camacho
OBJECTIVE: Maximum diameter (MD) is the established rupture predictor for abdominal aortic aneurysm (AAA). However, biomechanical markers from finite element analysis (FEA) could be more accurate predictors for these patients. In this study, the association between peak wall stress (PWS) and MD with symptoms of AAA was evaluated. METHODS: Patients diagnosed with infrarenal non-ruptured AAA at the centre between 2009 and 2015 were included. Clinical data, morphological variables (including MD), and the biomechanical variables PWS and diameter normalised PWS (dnPWS) in symptomatic (sAAA) and asymptomatic AAA patients (aAAA) were included...
October 15, 2017: European Journal of Vascular and Endovascular Surgery
keyword
keyword
24525
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"