scholarly journals Time and frequency dependent mechanical properties of LaCoO3-based perovskites: Neutron diffraction and domain mobility

2018 ◽  
Vol 124 (20) ◽  
pp. 205104 ◽  
Author(s):  
Mykola Lugovy ◽  
Amjad Aman ◽  
Nina Orlovskaya ◽  
Viktor Slyunyayev ◽  
Thomas Graule ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Neutron Diffraction ◽  
Frequency Dependent

Neutron Diffraction Study of a New Generation of Implants

2008 ◽  
Vol 571-572 ◽  
pp. 163-168
Author(s):  
Abdelilah Benmarouane ◽  
Helene Citterio-Bigot ◽  
T. Hansen ◽  
Pierre Millet ◽  
Alain Lodini
Keyword(s):  
Mechanical Properties ◽  
Composite Material ◽  
Neutron Diffraction ◽  
Diffraction Study ◽  
Thermal Spraying ◽  
Organic Matrix ◽  
Neutron Diffraction Study ◽  
Mineral Phase ◽  
New Generation ◽  
Strength And Ductility

In recent years, nanostructured coatings by Plasma Thermal Spraying (PTS) attracted intense interest due to their enhanced mechanical properties as hardness, strength and ductility. The aim of this study was to evaluate the influence of coating the implant by nanohydroxyaptite, n-HAp, Ca10 (PO4)6(OH)2. The results obtained with n-HAp will also compared with the implant coated with HAp. Bone is a composite material in which are associated a mineral phase in the form of crystals of HAp and an organic matrix constituted by collagen. The c-axes of HAp and the collagen fibers are preferentially oriented in the direction of the stresses that the bones need to withstand. At the interface implant-bone, the new bone reconstituted after implantation must have the same proprieties of the original bone in order to have good fixation with the implant. Therefore, it is necessary to study the mechanical properties of this new bone crystals reconstituted at the interface with the implants coated with n-HAp and HAp by neutrons diffraction on D20 at ILL.

Synchrotron Radiation and Neutron Diffraction Study of Hydroxyapatite in Bone at the Interface with Implant

2010 ◽  
Vol 638-642 ◽  
pp. 748-753
Author(s):  
Abdelilah Benmarouane ◽  
Helene Citterio-Bigot ◽  
Guillaume Geandier ◽  
T. Hansen ◽  
Pierre Millet ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Synchrotron Radiation ◽  
Neutron Diffraction ◽  
Neutron Diffraction Study ◽  
Good Prediction ◽  
Direct Connection ◽  
Implant Surface ◽  
Non Destructive ◽  
Non Destructive Techniques

The quantitative evaluation of the preferential orientation of crystallites by the synchrotron and neutron diffraction techniques during regeneration at the interface with implant gives a good prediction of the mechanical properties of the bone. During the process of bone healing after implantation, the speed and quality of regeneration is affected by the nature of the implant surface. Titanium alloy (Ti-Al-4V) is currently coating with the hydroxyapatite (HAp), Ca10(PO4)6 (OH)2, in order to obtain a stable and functional direct connection between bone and implant. At the interface implant-bone, the new bone reconstituted after implantation must have the same mechanical properties of bone in order to accept the implant. Therefore, it is necessary to study by means of two non destructive techniques: neutron diffraction and synchrotron radiation, the crystal growth and texture of this new bone crystals reconstituted at the interface.

scholarly journals Energy localization and frequency analysis in the locust ear

2014 ◽  
Vol 11 (90) ◽  
pp. 20130857 ◽  
Author(s):  
Robert Malkin ◽  
Thomas R. McDonagh ◽  
Natasha Mhatre ◽  
Thomas S. Scott ◽  
Daniel Robert
Keyword(s):  
Mechanical Properties ◽  
Signal Analysis ◽  
Structural Features ◽  
Dependent Manner ◽  
Sound Waves ◽  
Energy Localization ◽  
Frequency Signal ◽  
Element Analysis ◽  
Frequency Dependent ◽  
Necessary And Sufficient

Animal ears are exquisitely adapted to capture sound energy and perform signal analysis. Studying the ear of the locust, we show how frequency signal analysis can be performed solely by using the structural features of the tympanum. Incident sound waves generate mechanical vibrational waves that travel across the tympanum. These waves shoal in a tsunami-like fashion, resulting in energy localization that focuses vibrations onto the mechanosensory neurons in a frequency-dependent manner. Using finite element analysis, we demonstrate that two mechanical properties of the locust tympanum, distributed thickness and tension, are necessary and sufficient to generate frequency-dependent energy localization.

Reduction in transmembrane Ca influx induced by the negative inotropic action of nicardipine in frog ventricular muscle

1986 ◽  
Vol 64 (7) ◽  
pp. 927-930
Author(s):  
Junna Hatae
Keyword(s):  
Mechanical Properties ◽  
Action Potential ◽  
Resting Potential ◽  
Ventricular Muscle ◽  
Inotropic Action ◽  
Frequency Dependent ◽  
High Frequencies ◽  
Dihydropyridine Derivative

The effects of nicardipine, a new 1,4-dihydropyridine derivative, on electrical and mechanical properties of frog ventricular muscle were examined. Nicardipine (3 × 10−7 M) reduced the twitch tension, and this reduction was frequency dependent, and considerable, in case of high frequencies. The resting potential was not affected by nicardipine (3 × 10−7 M), but the plateau height of the action potential was decreased and the duration of the action potential was shortened. The suppression of this plateau height was frequency dependent. The nicardipine-induced suppression of tension and action potential could be almost completely antagonized by raising the concentration of [Ca]o or by applying isoprenaline (8 × 10−7 M). These results suggest that the negative inotropic action of nicardipine is induced mainly by a reduction in the transmembrane Ca influx.

407 Mechanical properties of nodular graphite cast iron by neutron diffraction

2010 ◽  
Vol 2010.18 (0) ◽  
pp. 95-96
Author(s):  
Daiki NAITO ◽  
Masatoshi IGUCHI ◽  
Yo TOMOTA ◽  
Stefanus FARJO ◽  
Hiroshi SUZUKI
Keyword(s):  
Mechanical Properties ◽  
Cast Iron ◽  
Neutron Diffraction ◽  
Graphite Cast Iron ◽  
Nodular Graphite
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