3,985 results match your criteria radial strength

The effect of microstructure on mechanical properties of corn cob.

Micron 2021 Apr 20;146:103070. Epub 2021 Apr 20.

Key Laboratory of Bionic Engineering, Ministry of Education, Jilin University, Changchun, 130025, China; College of Biological and Agricultural Engineering, Jilin University, Changchun, 130025, China.

As a natural biomass resource, corn cob has excellent mechanical properties and a special layered structure. To investigate the relationship between the mechanical properties and microstructure of corn cob, the ultra-deep field 3D microscope was used to characterize the macro geometric parameters, and the scanning electron microscopy (SEM) was observe the microstructure of the corn cob. The Fourier transform infrared spectrometer was used to analyze the fiber composition, revealing the contribution of fiber composition to the mechanical properties. Read More

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Biodegradable performance of PLA stents affected by geometrical parameters: The risk of fracture and fragment separation.

J Biomech 2021 Apr 28;122:110489. Epub 2021 Apr 28.

Department of Mechanical Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran. Electronic address:

Biodegradable endovascular stents have been claimed to be reliable candidates for implantation devices used in treating cardiovascular diseases since they reduce the long-term side effects on the human biological system. It is aimed in this study to investigate the effect of geometrical parameters on the degradation behavior of poly (lactic acid) stents in term of strut fracture and fragment separation. In this regard, various structural geometry of the PLA stents was simulated in a stenosed artery using finite element method. Read More

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Regional Gas Exchange Measured by Xe Magnetic Resonance Imaging Before and After Combination Bronchodilators Treatment in Chronic Obstructive Pulmonary Disease.

J Magn Reson Imaging 2021 May 7. Epub 2021 May 7.

Department of Medicine, Duke University Medical Center, Durham, North Carolina, USA.

Background: Hyperpolarized Xe magnetic resonance imaging (MRI) provides a non-invasive assessment of regional pulmonary gas exchange function. This technique has demonstrated that chronic obstructive pulmonary disease (COPD) patients exhibit ventilation defects, reduced interstitial barrier tissue uptake, and poor transfer to capillary red blood cells (RBCs). However, the behavior of these measurements following therapeutic intervention is unknown. Read More

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Investigating the material modelling of a polymeric bioresorbable scaffold via in-silico and in-vitro testing.

J Mech Behav Biomed Mater 2021 Apr 23;120:104557. Epub 2021 Apr 23.

Computational Engineering and Design Research Group, Faculty of Engineering and Physical Sciences, University of Southampton, Southampton, UK. Electronic address:

The accurate material modelling of poly-l-lactic acid (PLLA) is vital in conducting finite element analysis of polymeric bioresorbable scaffolds (BRS) to investigate their mechanical performance and seek improved scaffold designs. To date, a large variety of material models have been utilised, ranging from simple elasto-plastic models to high fidelity parallel network models. However, no clear consensus has been reached on the appropriateness of these different models and whether simple, less computationally expensive models can serve as acceptable approximations. Read More

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Monte Carlo study of TG-43 dosimetry parameters of GammaMed Plus high dose rate Ir brachytherapy source using TOPAS.

J Appl Clin Med Phys 2021 May 5. Epub 2021 May 5.

Department of Radiation Oncology, National Cancer Center/National Clinical Research Center for Cancer/Cancer Hospital & Shenzhen Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Shenzhen, 518116, China.

Purpose: To develop a simulation model for GammaMed Plus high dose rate Ir brachytherapy source in TOPAS Monte Carlo software and validate it by calculating the TG-43 dosimetry parameters and comparing them with published data.

Methods: We built a model for GammaMed Plus high dose rate brachytherapy source in TOPAS. The TG-43 dosimetry parameters including air-kerma strength S , dose-rate constant Λ, radial dose function g (r), and 2D anisotropy function F(r,θ) were calculated using Monte Carlo simulation with Geant4 physics models and NNDC Ir spectrum. Read More

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Collateral ligament sprains of the metacarpophalangeal joint of the long fingers: Results of a surgical series of 15 patients.

Orthop Traumatol Surg Res 2021 May 2. Epub 2021 May 2.

Institut Montpelliérain de la Main et du Membre Supérieur, Clinique Saint-Roch, 560 Avenue du Colonel Pavelet, 34070 Montpellier, France.

Introduction Collateral ligament sprains of the metacarpophalangeal joint (MP) of the long fingers are rare and mostly treated conservatively. Clinical examination to diagnose the severity of these injuries is mandatory. The purpose of our study is to report the results of 15 patients treated surgically. Read More

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Design of Nonlinear Autoregressive Exogenous Model Based Intelligence Computing for Efficient State Estimation of Underwater Passive Target.

Entropy (Basel) 2021 Apr 29;23(5). Epub 2021 Apr 29.

School of Marine Science and Technology, Northwestern Polytechnical University, Xi'an 710072, China.

In this study, an intelligent computing paradigm built on a nonlinear autoregressive exogenous (NARX) feedback neural network model with the strength of deep learning is presented for accurate state estimation of an underwater passive target. In underwater scenarios, real-time motion parameters of passive objects are usually extracted with nonlinear filtering techniques. In filtering algorithms, nonlinear passive measurements are associated with linear kinetics of the target, governing by state space methodology. Read More

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Safety and efficacy of new-generation coronary bioresorbable scaffolds: a systematic review.

Minerva Cardiol Angiol 2021 May 4. Epub 2021 May 4.

UO Cardiologia, Azienda Ospedaliera Universitaria di Ferrara, Ferrara, Italy -

Introduction: The concept of bioresorbable scaffolds (BRS) born with the aim to reduce the rate of late and very late cardiac events related to drug-eluting stents. However, first-generation BRS failed to prove their short-term safety and efficacy. Based on data derived from early investigations, new-generation BRS have been developed and tested in preliminary studies. Read More

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Results of central ray metacarpal resection after failure of digit replantation in children.

Hand Surg Rehabil 2021 Apr 30. Epub 2021 Apr 30.

Service de chirurgie infantile à orientation orthopédique, Hôpital Universitaire Robert Debré, Assistance Publique- Hôpitaux de Paris (AP-HP), Université de Paris, 48 Boulevard Sérurier, 75019 Paris, France.

Central ray amputation results severe esthetic blemish and functional and psychological sequelae. Three main reconstruction procedures have been reported in adults: digital translocation, intracarpal osteotomy, and metacarpal resection; none of these, however, have been studied in children. The aim of this study was to report medium-term results for treatment of central ray amputation by proximal metacarpal resection following failure of digit replantation in children (i. Read More

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Damage evolution of biodegradable magnesium alloy stent based on configurational forces.

J Biomech 2021 Apr 18;122:110443. Epub 2021 Apr 18.

State Key Laboratory for Strength and Vibration of Mechanical Structures, School of Aerospace, Xi'an Jiaotong University, Xi'an 710049, China. Electronic address:

Magnesium alloy has attracted most of the recent attention as a candidate for stent material due to their biocompatible and biodegradable nature. However, their corrosion behavior in the human body is still a major issue in research today. In this paper, a strategy to simulate damage evolution in biodegradable magnesium alloy stent is given by introducing a configurational damage model. Read More

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Proximal Row Carpectomy with Total Scapoidectomy vs. Conventional Carpal Resection for ReMotion Total Wrist Arthroplasty.

J Clin Med 2021 Apr 26;10(9). Epub 2021 Apr 26.

Faculty of Medicine, Johannes Kepler University Linz, Altenbergerstraße 69, 4020 Linz, Austria.

High complication rates in total wrist arthroplasty (TWA) still lead to controversy in the medical literature, and novel methods for complication reduction are warranted. In the present retrospective cohort study, we compare the outcomes of the proximal row carpectomy (PRC) method including total scaphoidectomy ( = 22) to the manufacturer's conventional carpal resection (CCR) technique, which retains the distal pole of the scaphoid ( = 25), for ReMotion prosthesis implantation in non-rheumatoid patients. Mean follow-up was 65. Read More

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Formation Mechanism and Control Method of Residual Stress Profile by Laser Shock Peening in Thin Titanium Alloy Component.

Materials (Basel) 2021 Apr 9;14(8). Epub 2021 Apr 9.

Science and Technology on Plasma Dynamics Laboratory, Air Force Engineering University, Xi'an 710038, Shaanxi, China.

In the laser shock peening process of titanium alloy thin blades, a shock wave will be repeatedly reflected and coupled in the blades, resulting in the failure of the formation of a gradient residual compressive stress layer, which is the key to improve fatigue performance and resist foreign object impact. This paper takes TC17 titanium alloy sheet as the research object to reveal the influence mechanism on residual stress-strain profile of shock wave reflection-coupling by shock wave propagation and key position dynamic response. Based on the result of influence mechanism, two wave transmission methods are proposed to regulate shock wave in order to reduce the intensity of shock wave reflection. Read More

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Bronchial stenting in infants with severe bronchomalacia: Technique and outcomes.

Int J Pediatr Otorhinolaryngol 2021 Apr 6;145:110703. Epub 2021 Apr 6.

Division of Pediatric Otolaryngology, Rady Children's Hospital and UC San Diego School of Medicine, 3020, Children's Way, San Diego, CA, USA. Electronic address:

Objectives: To report the first use of a balloon expandable bare metal stent for treating infant bronchomalacia.

Background: Infant bronchomalacia often requires prolonged mechanical ventilation and can be life-threatening. Effective treatment for severe infant bronchomalacia continues to be elusive. Read More

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Distal biceps ruptures repair: Experience with 80 cases.

Rev Esp Cir Ortop Traumatol 2021 Apr 23. Epub 2021 Apr 23.

Servicio de Cirugía Ortopédica y Traumatología, Hospital Fremap, Sevilla, España.

Introduction And Objectives: Rupture of distal biceps has a frequency of 1.2 cases per 100,000 population. Conservative treatment presents a loss in supination of 40% and flexion of 30%, like transfers to the brachialis. Read More

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Temporary spanning plate wrist fixation of complex distal radius fractures: a systematic review of 353 patients.

Eur J Trauma Emerg Surg 2021 Apr 26. Epub 2021 Apr 26.

Department of Orthopedic and Trauma Surgery, Cantonal Hospital of Lucerne, Lucerne, Switzerland.

Purpose: Temporary spanning plate fixation of the wrist has been described as an alternative treatment method for complex distal radius fractures (DRfs). This systematic review aims to gain insight on clinical and radiological outcomes of this technique currently published in literature.

Methods: A comprehensive literature search of Pubmed, Embase, CENTRAL and CINAHL databases was conducted on November 5th 2020. Read More

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Relationships Between Clinically Measured Upper-Extremity Physical Characteristics and Ball Spin Rate in Professional Baseball Pitchers.

J Strength Cond Res 2021 May;35(5):1331-1337

Texas Metroplex Institute for Sports Medicine and Orthopedics, Arlington, Texas.

Abstract: Wong, R, Laudner, K, Evans, D, Miller, L, Blank, T, and Meister, K. Relationships between clinically measured upper-extremity physical characteristics and ball spin rate in professional baseball pitchers. J Strength Cond Res 35(5): 1331-1337, 2021-During baseball pitching, physical characteristics of the shoulder, elbow, wrist, hand, and fingers have been hypothesized to be critical to creating ball spin. Read More

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Treatment of diaphyseal forearm fracture with interlocking intramedullary nailing: A pilot study.

J Clin Orthop Trauma 2021 Jun 26;17:195-200. Epub 2021 Mar 26.

Department of Orthopedics, YMT Hospital, Kharghar, Maharashtra, India.

Introduction: The present study was done to assess the functional outcome and complications of interlocking intramedullary (IM) radius ulna nailing to treat radio-ulna fractures in adults.

Methodology: Thirty adult patients with diaphyseal or segmental fractures of radius and ulna were included and treated with IM nailing. Grace and Eversmann rating system was used to assess functional evaluation and grip strength was measured using grasp dynamometer. Read More

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Radial head excision and Achilles allograft interposition arthroplasty for the treatment of chronic pediatric radiocapitellar pathologies: A report of four cases.

Shoulder Elbow 2021 Apr;13(2):213-222

Division of Orthopedic Surgery, Tel Aviv Sourasky Medical Center, Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel.

Background: Severe radiocapitellar pathologies represent a unique problem in the pediatric population, as radial head excision can lead to substantial long-term complications. We present a case series of four pediatric patients treated by a novel technique-radial head excision followed by Achilles allograft interposition arthroplasty.

Methods: Four children (ages 12-15 years) are described. Read More

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SiC Nanowire-SiN Nanobelt Interlocking Interfacial Enhancement of Carbon Fiber Composites with Boosting Mechanical and Frictional Properties.

ACS Appl Mater Interfaces 2021 May 26;13(17):20746-20753. Epub 2021 Apr 26.

Faculty of Engineering, The University of Nottingham, University Park, Nottingham NG7 2RD, United Kingdom.

Carbon fiber composites composed of carbon fiber and pyrolytic carbon (PyC) matrix have great potential application in the brakes of aircrafts, where the combination of high mechanical strength and excellent frictional properties are required. In this work, two-component silicon-based interlocking enhancements were designed and constructed into carbon fiber composites for boosting the mechanical and frictional properties. Specially, silicon carbide nanowires (SiCnws) and silicon nitride nanobelts (SiNnbs) could form interlocking architectures, where SiCnws are rooted firmly on the carbon fiber surface in the radial direction and SiNnbs integrate the PyC matrix with carbon fibers together via a networked shape. Read More

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Functional Outcomes for Meniscal Allograft Interposition Arthroplasty of the Hand.

Plast Reconstr Surg Glob Open 2021 Apr 20;9(4):e3520. Epub 2021 Apr 20.

Department of Orthopedic Surgery, Cedars Sinai Hospital, Los Angeles, Calif.

Background: Osteochondral defects of the carpometacarpal (CMC), metacarpophalangeal (MCP), and proximal interphalangeal (PIP) joints often necessitate arthrodesis or arthroplasty. Meniscal allograft has been used for large joint resurfacing, but its application to smaller joints is less well understood. We propose its use for hand joint resurfacing as an off-the-shelf alternative to address osteochondral defects and restore articular function. Read More

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Computational and experimental mechanical performance of a new everolimus-eluting stent purpose-built for left main interventions.

Sci Rep 2021 Apr 22;11(1):8728. Epub 2021 Apr 22.

Cardiovascular Biology and Biomechanics Laboratory, Cardiovascular Division, University of Nebraska Medical Center, 982265 Nebraska Medical Center, Omaha, NE, 68198, USA.

Left main (LM) coronary artery bifurcation stenting is a challenging topic due to the distinct anatomy and wall structure of LM. In this work, we investigated computationally and experimentally the mechanical performance of a novel everolimus-eluting stent (SYNERGY MEGATRON) purpose-built for interventions to large proximal coronary segments, including LM. MEGATRON stent has been purposefully designed to sustain its structural integrity at higher expansion diameters and to provide optimal lumen coverage. Read More

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Association between ABO, Rh blood groups, lip and dermatoglyphic patterns, and nonsyndromic oral clefts: A case-control study.

J Indian Soc Pedod Prev Dent 2021 Jan-Mar;39(1):9-15

Department of Public Health Dentistry, Meenakshi Ammal Dental College, Chennai, Tamil Nadu, India.

Objective: The objective of the study is to determine the association between nonsyndromic oral clefts (OC) in children and ABO, Rh blood groups, lip, and dermatoglyphic patterns of their unaffected parents.

Methods: This case-control study was conducted at a tertiary cleft center in Chennai, India, among 240 individuals comprising 80 units (40 cases and controls, respectively). Each unit (triad) was constituted by a child (0-12 years of age) either born with nonsyndromic OC (cases) or with no diagnosed congenital anomaly (control) and their unaffected parents (mother and father). Read More

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Failure of molecular dynamics to provide appropriate structures for quantum mechanical description of the aqueous chloride ion charge-transfer-to-solvent ultraviolet spectrum.

Phys Chem Chem Phys 2021 Apr;23(15):9109-9120

Radiation Laboratory, University of Notre Dame, Notre Dame, IN 46556-5674, USA.

The lowest band in the charge-transfer-to-solvent ultraviolet absorption spectrum of aqueous chloride ion is studied by experiment and computation. Interestingly, the experiments indicate that at concentrations up to at least 0.25 M, where calculations indicate ion pairing to be significant, there is no notable effect of ionic strength on the spectrum. Read More

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A test of ab initio-generated, radial intermolecular potential energy functions for five axially-symmetric, hydrogen-bonded complexes BHF, where B = N, CO, PH, HCN and NH.

Anthony C Legon

Phys Chem Chem Phys 2021 Mar 22;23(12):7271-7279. Epub 2021 Mar 22.

School of Chemistry, University of Bristol, Cantock's Close, Bristol, BS8 1TS, UK.

The radial potential energy functions for five axially symmetric, hydrogen-bonded complexes BHF (B = N, CO, PH, HCN and NH) have been calculated ab initio at the explicitly correlated level of theory CCSD(T)(F12c)/cc-pVTZ-F12 as a function of the hydrogen-bond distance r(ZH), where Z is the hydrogen-bond acceptor atom of B. The remaining geometric parameters were optimised at each point in the calculation. The functions so generated were then used to estimate the spectroscopic constants ω, ωx,α, and the v = 1 ← 0 transition wavenumber associated with the intermolecular stretching mode ν of each BHF by using two equivalent approaches. Read More

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Exploring photoacoustic spectroscopy-based machine learning together with metabolomics to assess breast tumor progression in a xenograft model ex vivo.

Lab Invest 2021 Apr 19. Epub 2021 Apr 19.

Department of Biophysics, Manipal School of Life Sciences, Manipal Academy of Higher Education, Manipal, Karnataka, India.

In the current study, a breast tumor xenograft was established in athymic nude mice by subcutaneous injection of the MCF-7 cell line and assessed the tumor progression by photoacoustic spectroscopy combined with machine learning tools. The advancement of breast tumors in nude mice was validated by tumor volume kinetics and histopathology and corresponding image analysis by TissueQuant software compared to controls. The ex vivo tumors in progressive conditions belonging to time points, day 5, 10, 15 & 20, were excited with 281 nm pulsed laser light and recorded the corresponding photoacoustic spectra in time domain. Read More

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Prospective Cross-Sectional Study of Repeatability of Peripapillary Capillary Density Measurement Using Optical Coherence Tomography Angiography in Eyes With Optic Nerve and Retinal Vascular Pathology.

J Neuroophthalmol 2021 Apr 14. Epub 2021 Apr 14.

Department of Ophthalmology and Vision Science (AFV, MYC, SSP), University of California Davis Eye Center, Sacramento, California; Department of Public Health Sciences/Biostatistics (SAA), Clinical and Translational Science Center, University of California Davis, Sacramento, California; Vision Center (MYC), Children's Hospital of Los Angeles, Los Angeles, California; and Department of Ophthalmology (MYC), Roski Eye Institute, Keck School of Medicine, University of Southern California, Los Angeles, California.

Background: Optical coherence tomography angiography (OCTA) is a new noninvasive imaging modality that provides high resolution images of the optic nerve head and peripapillary retinal capillary vasculature which can be affected by optic nerve or retinal pathologies. High repeatability of peripapillary capillary density measurement using OCTA has been demonstrated in normal eyes and eyes with glaucoma. The purpose of our study was to quantify the repeatability of peripapillary capillary density measurement using OCTA in both normal eyes and eyes with optic atrophy, optic disc edema, and retinal vasculopathy. Read More

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Diagnostic accuracy of sensory and motor tests for the diagnosis of carpal tunnel syndrome: a systematic review.

BMC Musculoskelet Disord 2021 Apr 7;22(1):337. Epub 2021 Apr 7.

School of Physical Therapy, Faculty of Health Science, Elborn College, Western University, London, ON, Canada.

Background: Carpal tunnel syndrome (CTS) is the most common entrapment mononeuropathy of the upper extremity. The previous systematic review of the diagnostic tests for CTS was outdated. The objective of this study was to compile and appraise the evidence on the accuracy of sensory and motor tests used for the diagnosis of CTS. Read More

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The role of the bubble-bubble interaction on radial pulsations of bubbles.

Ultrason Sonochem 2021 May 24;73:105535. Epub 2021 Mar 24.

The Key Laboratory of Modern Acoustics, Ministry of Education, Institution of Acoustics, Nanjing University, Nanjing 210093, China. Electronic address:

Using a model that with or without considering the interaction between bubbles through the radiated pressure waves, numerical simulations of cavitation bubbles have been performed in order to study the effect of the bubble-bubble interaction on radial pulsations of bubbles. Comparing the results obtained by with or without considering the bubble-bubble interaction, it is suggested that the suppression or enlargement property of expansion ratios of bubbles due to the bubble-bubble interaction largely depends on the ultrasound parameters, the ambient bubble radii, the distances between bubbles and the number of bubbles (in multi-bubble environment, the last two aspects can be expressed using the coupling strength). The frequency response curve of expansion ratio decreases and shifts to left due to the bubble-bubble interaction and the larger the coupling strength is, the more the left-shifting is. Read More

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Left ventricular myocardial strain quantification with two- and three-dimensional cardiovascular magnetic resonance based tissue tracking.

Quant Imaging Med Surg 2021 Apr;11(4):1421-1436

Internal Medicine II, Ulm University Medical Center, Ulm, Germany.

Background: Cardiovascular magnetic resonance based tissue tracking (CMR-TT) was reported to provide detailed insight into left ventricular (LV) contractile function and deformation with both of two- and three-dimensional (2/3D) algorithms. This study was designed to investigate the feasibility and reproducibility of these two techniques for measuring LV global and segmental strain, and establish gender- and age-related reference values of global multi-dimensional peak strains among large healthy population.

Methods: We retrospectively recruited 150 healthy volunteers (75 males/females) and divided them into three age groups (G, G and G). Read More

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Comparing Outcomes between Arthroscopic-Assisted Reduction and Fluoroscopic Reduction in AO Type C Distal Radius Fracture Treatment.

J Wrist Surg 2021 Apr 4;10(2):102-110. Epub 2020 Nov 4.

Department of Orthopaedics and Traumatology, Prince of Wales Hospital, Sha Tin, Hong Kong.

 Distal radius fracture is one of the most common injuries. Poor functional result with restricted wrist motion can be developed when there is intra-articular fibrous tissue development arising from articular step-off and gapping.  The aim of this study is to compare the functional and radiological outcome between arthroscopic-assisted reduction and fluoroscopic reduction in treating unstable intra-articular distal radius fracture. Read More

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