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https://www.readbyqxmd.com/read/28804646/glaucoma-quality-of-life
#1
EDITORIAL
Antonio Maria Fea, Fritz Hengerer, Carlo Lavia, Leon Au
No abstract text is available yet for this article.
2017: Journal of Ophthalmology
https://www.readbyqxmd.com/read/28790407/employing-high-frequency-alternating-magnetic-fields-for-the-non-invasive-treatment-of-prosthetic-joint-infections
#2
Rajiv Chopra, Sumbul Shaikh, Yonatan Chatzinoff, Imalka Munaweera, Bingbing Cheng, Seth M Daly, Yin Xi, Chenchen Bing, Dennis Burns, David E Greenberg
Treatment of prosthetic joint infection (PJI) usually requires surgical replacement of the infected joint and weeks of antibiotic therapy, due to the formation of biofilm. We introduce a non-invasive method for thermal destruction of biofilm on metallic implants using high-frequency (>100 kHz) alternating magnetic fields (AMF). In vitro investigations demonstrate a >5-log reduction in bacterial counts after 5 minutes of AMF exposure. Confocal and scanning electron microscopy confirm removal of biofilm matrix components within 1 minute of AMF exposure, and combination studies of antibiotics and AMF demonstrate a 5-log increase in the sensitivity of Pseudomonas aeruginosa to ciprofloxacin...
August 8, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28772743/a-life-prediction-model-of-multilayered-pth-based-on-fatigue-mechanism
#3
Yaqiu Li, Weiwei Hu, Yufeng Sun, Zili Wang, Ali Mosleh
Plated through hole (PTH) plays a critical role in printed circuit board (PCB) reliability. Thermal fatigue deformation of the PTH material is regarded as the primary factor affecting the lifetime of electrical devices. Numerous research efforts have focused on the failure mechanism model of PTH. However, most of the existing models were based on the one-dimensional structure hypothesis without taking the multilayered structure and external pad into consideration. In this paper, the constitutive relation of multilayered PTH is developed to establish the stress equation, and finite element analysis (FEA) is performed to locate the maximum stress and simulate the influence of the material properties...
April 4, 2017: Materials
https://www.readbyqxmd.com/read/28772518/mesoscale-fracture-analysis-of-multiphase-cementitious-composites-using-peridynamics
#4
Amin Yaghoobi, Mi G Chorzepa, S Sonny Kim, Stephan A
Concrete is a complex heterogeneous material, and thus, it is important to develop numerical modeling methods to enhance the prediction accuracy of the fracture mechanism. In this study, a two-dimensional mesoscale model is developed using a non-ordinary state-based peridynamic (NOSBPD) method. Fracture in a concrete cube specimen subjected to pure tension is studied. The presence of heterogeneous materials consisting of coarse aggregates, interfacial transition zones, air voids and cementitious matrix is characterized as particle points in a two-dimensional mesoscale model...
February 10, 2017: Materials
https://www.readbyqxmd.com/read/28772485/optimal-electrode-selection-for-electrical-resistance-tomography-in-carbon-fiber-reinforced-polymer-composites
#5
Luis Waldo Escalona Galvis, Paulina Diaz-Montiel, Satchi Venkataraman
Electrical Resistance Tomography (ERT) offers a non-destructive evaluation (NDE) technique that takes advantage of the inherent electrical properties in carbon fiber reinforced polymer (CFRP) composites for internal damage characterization. This paper investigates a method of optimum selection of sensing configurations for delamination detection in thick cross-ply laminates using ERT. Reduction in the number of sensing locations and measurements is necessary to minimize hardware and computational effort. The present work explores the use of an effective independence (EI) measure originally proposed for sensor location optimization in experimental vibration modal analysis...
February 4, 2017: Materials
https://www.readbyqxmd.com/read/28763042/optimization-of-a-voc-sensor-with-a-bilayered-diaphragm-using-fbar-as-strain-sensing-elements
#6
Huihui Guo, Aohui Guo, Yang Gao, Tingting Liu
Film bulk acoustic resonators (FBARs) are widely applied in mass bio-sensing and pressure sensors, owing to their extreme sensitivity and integration ability, and ability to miniaturize circuits. A volatile organic compound (VOC) sensor with a polymer-coated diaphragm, using FBARs as a strain sensing element is proposed and optimized. This vapor sensor is based on organic vapor-induced changes of mechanical deformation of the micro-diaphragm. The four FBARs are located at the edge of the bi-layer diaphragm comprising silicon nitride and silicon oxide for strain extraction...
August 1, 2017: Sensors
https://www.readbyqxmd.com/read/28759617/flow-and-fracture-behavior-of-aluminum-alloy-6082-t6-at-different-tensile-strain-rates-and-triaxialities
#7
Xuanzhen Chen, Yong Peng, Shan Peng, Song Yao, Chao Chen, Ping Xu
This study aims to investigate the flow and fracture behavior of aluminum alloy 6082-T6 (AA6082-T6) at different strain rates and triaxialities. Two groups of Charpy impact tests were carried out to further investigate its dynamic impact fracture property. A series of tensile tests and numerical simulations based on finite element analysis (FEA) were performed. Experimental data on smooth specimens under various strain rates ranging from 0.0001~3400 s-1 shows that AA6082-T6 is rather insensitive to strain rates in general...
2017: PloS One
https://www.readbyqxmd.com/read/28756669/high-level-quantum-calculations-of-the-ir-spectra-of-the-eigen-zundel-and-ring-isomers-of-h-h2o-4-find-a-single-match-to-experiment
#8
Qi Yu, Joel M Bowman
The protonated water tetramer H+ (H2O)4 , often written as the Eigen cluster, H3O+(H2O)3, plays a central role in studies of the hydrated proton. The cluster has been inves- tigated spectroscopically both experimentally and theoretically with some differences and controversies. The major issue stems from the existence of higher-energy Zundel isomers of this clus- ter and the role these might play in the IR spectra. Settling this fundamental issue is one goal of this Communication, where high-level quantum calculations of the IR spectra of the Eigen and three isomeric forms of this cluster are presented...
July 31, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28751986/evaluation-of-bleb-morphology-and-reduction-in-iop-and-glaucoma-medication-following-implantation-of-a-novel-gel-stent
#9
Antonio Maria Fea, Roberta Spinetta, Paola Maria Loredana Cannizzo, Giulia Consolandi, Carlo Lavia, Vittoria Aragno, Francesco Germinetti, Teresa Rolle
OBJECTIVE: To evaluate the efficacy and safety of the Xen Gel Stent and provide a macro- and microscopic analyses of bleb morphology. METHODS: A prospective 12-month study on patients with primary open-angle glaucoma. Patients underwent implantation of the XEN Gel Stent (Allergan INC, Dublin, Ireland) either alone or combined with a cataract surgery. Biomicroscopy, in vivo confocal microscopy (IVCM), and anterior segment-optical coherence tomography (AS-OCT) were used to assess bleb morphology...
2017: Journal of Ophthalmology
https://www.readbyqxmd.com/read/28743370/computational-and-clinical-investigation-on-the-role-of-mechanical-vibration-on-orthodontic-tooth-movement
#10
Zhipeng Liao, Selma Elekdag-Turk, Tamer Turk, Johnathan Grove, Oyku Dalci, Junning Chen, Keke Zheng, M Ali Darendeliler, Michael Swain, Qing Li
The aim of this study is to investigate the biomechanics for orthodontic tooth movement (OTM) subjected to concurrent single-tooth vibration (50Hz) with conventional orthodontic force application, via a clinical study and computational simulation. Thirteen patients were recruited in the clinical study, which involved distal retraction of maxillary canines with 1.5N (150g) force for 12weeks. In a split mouth study, vibration and non-vibration sides were randomly assigned to each subject. Vibration of 50Hz, of approximately 0...
June 21, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/28740720/analysing-the-reasons-of-failure-of-surgical-mitral-repair-approaches-do-we-need-to-better-think-in-biomechanics
#11
Massimiliano Fraldi, Cristiano Spadaccio, Christos G Mihos, Francesco Nappi
The failure of mitral valve repair procedures revealed in the outcomes of the recent randomized studies is suggesting the necessity for a better understanding of the biomechanical mechanisms underlying the failure of the surgical approaches. Use of biomechanical modelling and finite element analysis (FEA) in cardiovascular research is an important aid in this context. In our group we developed a biomechanical model taking into account all the component of the mitral valve functional unit including the valve leaflets, the annulus, the papillary muscles, the chordae tendinea and the ventricular geometry...
June 2017: Journal of Thoracic Disease
https://www.readbyqxmd.com/read/28740716/biomechanics-raises-solution-to-avoid-geometric-mitral-valve-configuration-abnormalities-in-ischemic-mitral-regurgitation
#12
REVIEW
Francesco Nappi, Cristiano Spadaccio, Christos G Mihos, Massimiliano Fraldi
Ischemic mitral regurgitation (IMR) is a form of mitral insufficiency that is characterized by papillary muscle (PM) displacement, leaflet tethering, reduced closing forces, and different degree of annular dilatation. Treatment of this condition includes mitral valve replacement or mitral valve repair with restrictive annuloplasty. Recent evidences in mitral valve repair showed that addressing only the annulus and neglecting the subvalvular apparatus provides a suboptimal operation with poor long-term results...
June 2017: Journal of Thoracic Disease
https://www.readbyqxmd.com/read/28739416/comparison-of-non-invasive-assessments-of-strength-of-the-proximal-femur
#13
Fjola Johannesdottir, Erica Thrall, John Muller, Tony M Keaveny, David L Kopperdahl, Mary L Bouxsein
It is not clear which non-invasive method is most effective for predicting strength of the proximal femur in those at highest risk of fracture. The primary aim of this study was to compare the abilities of dual energy X-ray absorptiometry (DXA)-derived aBMD, quantitative computed tomography (QCT)-derived density and volume measures, and finite element analysis (FEA)-estimated strength to predict femoral failure load. We also evaluated the contribution of cortical and trabecular bone measurements to proximal femur strength...
July 21, 2017: Bone
https://www.readbyqxmd.com/read/28735790/patient-specific-finite-element-analysis-of-fiber-post-and-ferrule-design
#14
Monise de Paula Rodrigues, Priscilla Barbosa Ferreira Soares, Andréa Dollores Correia Miranda Valdivia, Roberto Sales Pessoa, Crisnicaw Veríssimo, Antheunis Versluis, Carlos José Soares
INTRODUCTION: A ferrule on anterior endodontic-treated teeth has been evaluated using clinical trials, in vitro tests, and finite element analysis (FEA). The patient-specific FEA with a nonuniform ferrule and nonlinear contact biting load associated with clinical validation can be used to predict failure. METHODS: A patient was selected with both maxillary central incisors with different ferrule designs who received endodontic treatment and restoration using a fiber post, composite core, and computer aided design and computer aided manufacturing lithium disilicate ceramic crowns...
July 20, 2017: Journal of Endodontics
https://www.readbyqxmd.com/read/28732529/exiguobacterium-sp-a1b-gx59-isolated-from-a-patient-with-community-acquired-pneumonia-and-bacteremia-genomic-characterization-and-literature-review
#15
Xingchun Chen, Lijun Wang, Jiali Zhou, Honglong Wu, Dong Li, Yanchao Cui, Binghuai Lu
BACKGROUND: Bacterial species belonging to the genus Exiguobacterium are facultative anaerobic, non-spore-forming, Gram-positive bacilli, and rarely associated with human infections. Herein, we reported the first case of community-acquired pneumonia (CAP) and bacteremia due to Exiguobacterium spp. in China. CASE PRESENTATION: An adult male with severe CAP was hospitalized. The pathogen was isolated from his bloodstream and broncho-alveolar lavage fluid. The correct identification of the micro-organism was achieved using 16S rRNA sequencing, and its antibiotic susceptibility test was performed by microdilution method...
July 21, 2017: BMC Infectious Diseases
https://www.readbyqxmd.com/read/28722309/long-term-outcomes-after-acute-primary-angle-closure-of-caucasian-chronic-angle-closure-glaucoma-cacg-patients
#16
Antonio Maria Fea, Laura Dallorto, Carlo Lavia, Giulia Pignata, Teresa Rolle, Tin Aung
IMPORTANCE: There is a lack of information about long term results of chronic angle closure glaucoma (CACG) following an acute primary angle closure (APAC) in Caucasian patients PURPOSE: To report morphological and functional long-term data of CACG eyes following a monolateral APAC attack and to provide a comparison with their fellow eyes DESIGN: Observational retrospective case series (Clinica Oculistica Universitaria, Ospedale Oftalmico, Turin) PARTICIPANTS: 57 consecutive patients (114 eyes) underwent long term follow-up analysis...
July 19, 2017: Clinical & Experimental Ophthalmology
https://www.readbyqxmd.com/read/28720340/mechanical-strength-and-fracture-point-of-a-dental-implant-under-certification-conditions-a-numerical-approach-by-finite-element-analysis
#17
Guillermo de la Rosa Castolo, Sonia V Guevara Perez, Pierre-Jean Arnoux, Laurent Badih, Franck Bonnet, Michel Behr
STATEMENT OF PROBLEM: Implant prosthodontics provides high-quality outcomes thanks to recent technological developments and certification procedures such as International Organization for Standardization (ISO) standard 14801. However, these certification tests are costly, and the result is highly uncertain as the influence of design variables (materials and structure) is still unknown. The design process could be significantly improved if the influence of design parameters were identified...
July 15, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28709037/finite-element-analysis-and-clinical-complications-in-mandibular-implant-overdentures-opposing-maxillary-dentures
#18
Tameem Khuder, Norsiah Yunus, Eshamsul Sulaiman, Ali Dabbagh
Denture fracture is a common clinical complication caused by improper material selection, design, or fabrication technique. This study aimed to investigate the effect of two attachment systems on fracture risk of the implant-overdentures (IOD) via finite element analysis (FEA), using the force distributions obtained from patients' occlusal analyses and to compare the obtained results with the clinical complications associated with these attachments. A three-dimensional jaw model comprised of the edentulous bones was constructed...
July 4, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28706786/role-of-1-5%C3%A2-mm-microplates-in-treatment-of-symphyseal-fracture-of-mandible-a-stress-analysis-based-comparative-study
#19
Syed S Ahmed, Siddharth Bhardwaj, Md Kalim Ansari, Omar Farooq, Abid Ali Khan
AIMS AND OBJECTIVES: To perform comparative finite element analysis (FEA)for 2.0 mm standard miniplate and 1.5 mm microplate in isolated symphyseal mandibular fractures. MATERIAL AND METHOD: Two FE models of mandible were developed and symphyseal fracture was created in both of them. Each fractured model was reduced and fixed using two mini plates and two microplates, respectively according Champ's principle. Stresses thus developed in the plates after application of masticatory load were observed in the models...
May 2017: Journal of Oral Biology and Craniofacial Research
https://www.readbyqxmd.com/read/28706195/effect-of-nb2o5-doping-on-improving-the-thermo-mechanical-stability-of-sealing-interfaces-for-solid-oxide-fuel-cells
#20
Qi Zhang, Xinhang Du, Shengwei Tan, Dian Tang, Kongfa Chen, Teng Zhang
Nb2O5 is added to a borosilicate sealing system to improve the thermo-mechanical stability of the sealing interface between the glass and Fe-Cr metallic interconnect (Crofer 22APU) in solid oxide fuel cells (SOFCs). The thermo-mechanical stability of the glass/metal interface is evaluated experimentally as well as by using a finite element analysis (FEA) method. The sealing glass doped with 4 mol.% Nb2O5 shows the best thermo-mechanical stability, and the sealing couple of Crofer 22APU/glass/GDC (Gd0.2Ce0...
July 13, 2017: Scientific Reports
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