An innovative method for in-situ composition analysis of fixed metallic dental restorations

2019 ◽  
Vol 35 (5) ◽  
pp. 709-712 ◽  
Author(s):  
M. Sütel ◽  
A. Schwitalla ◽  
T. Zimmermann ◽  
W.D. Müller
Keyword(s):  
Composition Analysis ◽  
Dental Restorations ◽  
Innovative Method

In-Situ SEM Observations of Moving Interfaces during Recrystallisation

2006 ◽  
Vol 519-521 ◽  
pp. 1341-1348 ◽  
Author(s):  
Sybrand van der Zwaag ◽  
E. Anselmino ◽  
A. Miroux ◽  
David J. Prior
Keyword(s):  
Grain Boundaries ◽  
Small Groups ◽  
Detailed Understanding ◽  
Small Areas ◽  
Orientation Contrast ◽  
Moving Interfaces ◽  
Innovative Method ◽  
Before And After ◽  
In Situ Observations

To obtain further progress and a more detailed understanding of the mechanisms involved in recrystallisation, new and more accurate techniques such as in-situ observations are necessary. This innovative method has been used to monitor the recrystallisation process in a FEGSEM equipped with hot stage. Observations are done in backscatter mode with particular attention to orientation contrast. EBSD maps of the observed areas can be acquired before and after recrystallisation. Details of the movement of the interfaces between the recrystallised region and the parent structure are recorded and analysed. The results show that the grain boundaries observed do not move smoothly but with a jerky motion. The recrystallising front sweeps through small areas, corresponding to single sub-grains or small groups of them, very rapidly and then stops at other sub-grain boundaries for varying time before progressing to the following area.

Processing and Characterization of Functionally Graded In Situ Aluminum Composite

2015 ◽  
Vol 830-831 ◽  
pp. 485-488
Author(s):  
A.G. Arsha ◽  
E. Jayakumar ◽  
T.P.D. Rajan ◽  
Ballembettu Chandrasekhar Pai
Keyword(s):  
Centrifugal Casting ◽  
Wear Test ◽  
Primary Silicon ◽  
Functionally Graded ◽  
Die Design ◽  
Composition Analysis ◽  
Head Region ◽  
Aluminum Composite ◽  
Centrifugally Cast

A390 functionally graded material (FGM) pistons were fabricated by centrifugal casting, where the silicon particles were segregated in the head portion of the pistons by appropriate design and their density differences. Centrifugal casting offers casting of cylindrical structures with gradation in its properties. In centrifugally cast A390, a suitable die design can lead to the formation of hard primary Si particles gradually distributed towards the head region producing a particle rich zone, transition zone and matrix rich zone. Microstructure and chemical composition analysis confirms the composition gradation. Hardness and wear test results revealed that the gradation positively helps to improve the desired properties with the presence of in-situ primary silicon reinforcements.

scholarly journals Polychromy on the Antonine Wall Distance Sculptures: Non-destructive Identification of Pigments on Roman Reliefs

Britannia ◽  
2020 ◽  
Vol 51 ◽  
pp. 175-201
Author(s):  
Louisa Campbell
Keyword(s):  
Material Culture ◽  
Materials Science ◽  
Analytical Techniques ◽  
Composition Analysis ◽  
Raman Spectrometry ◽  
X Ray ◽  
Wall Distance ◽  
Depositional Processes ◽  
Non Destructive

ABSTRACTNon-destructive analytical techniques are now widely and successfully employed in the fields of materials science and conservation. Portable X-ray fluorescence (pXRF) and portable Raman spectrometry have proven particularly valuable for the rapid in-situ analysis of samples, but their applicability for the analysis of archaeological artefacts for which survival of surface treatments can be negatively impacted by post-depositional processes has been underexplored. Roman relief-sculpted monumental inscriptions from the Antonine Wall, commonly referred to as ‘Distance Slabs’, have offered an excellent opportunity to deploy these non-destructive techniques to determine whether they were originally adorned with pigments and, if so, to identify the colours used. This is a revolutionary approach to identifying colours on ancient sandstone sculpture that transforms our understanding of these unique monuments. Elemental composition analysis by pXRF has confirmed evidence for pigments and this is supported by the Raman results, making it possible to develop and reconstruct a palette of colours that originally brought these monuments to life in vibrant polychrome. The research offers a new methodology for identifying pigments on sandstone sculpture and opens new avenues for investigating other classes of material culture alongside the development of bespoke analytical equipment.

Machining of a Rock Surface Shaver with a Piezoelectric Actuator forIn situAnalysis in Lunar and Planetary Exploration

2016 ◽  
Vol 10 (4) ◽  
pp. 533-539 ◽  
Author(s):  
Katsushi Furutani ◽  
◽  
Eiji Kagami ◽  
Keyword(s):  
Surface Roughness ◽  
Piezoelectric Actuator ◽  
Thrust Force ◽  
Sample Surface ◽  
Rock Surface ◽  
Composition Analysis ◽  
Machining Performance ◽  
Asteroid Exploration ◽  
Offset Voltage

Future lunar, planetary, and asteroid exploration will strongly demandin situanalysis of rock samples to obtain data related to various aspects. For precise composition analysis, a sample surface should be smoothed. In this paper, a surface shaver with a piezoelectric actuator is proposed and its machining performance in air is investigated. Shaving teeth are mounted at the ends of a pair of lever mechanisms. The device is pressed through four springs onto the workpiece with a linear actuator. When a sinusoidal voltage of 50 Vp-pand an offset voltage of 25 V were applied, the resonance frequency was 556 Hz and the unloaded amplitude of the shaving teeth was 0.77 mmp-p. Basalt workpieces were machined for 10 min in air. Increasing the thrust force reduced the surface roughness, although the amount removed diminished with a further increase in the thrust force. The surface roughness varied widely not only due to the amount removed but also due to containing the pores.

An innovative method for in situ monitoring of the detachments in architectural coverings of ancient structures

2020 ◽  
Vol 42 ◽  
pp. 139-146 ◽  
Author(s):  
Francesca Mariani ◽  
Alessandro S. Savoia ◽  
Giosuè Caliano
Keyword(s):  
In Situ Monitoring ◽  
Innovative Method

An Innovative Triple Immunogold Labeling Method to Investigate the Hemopoietic Stem Cell NicheIn Situ

2009 ◽  
Vol 15 (5) ◽  
pp. 403-414 ◽  
Author(s):  
Sarah L. Ellis ◽  
Brenda Williams ◽  
Stephen Asquith ◽  
Ivan Bertoncello ◽  
Susan K. Nilsson
Keyword(s):  
Stem Cell ◽  
Immunogold Labeling ◽  
Hemopoietic Stem Cell ◽  
Hemopoietic Stem Cells ◽  
Innovative Method ◽  
Transmission Electron ◽  
Rare Cells ◽  
Cellular Phenotypes ◽  
Labeling Method

AbstractThe ultrastructural study of rare cells within their nichein situis very difficult. We have developed a method for locating individual transplanted cells and simultaneously identifying and analyzing the molecules and cellular phenotypes surrounding themin situusing transmission electron microscopy. This innovative method involves triple immunogold labeling combined with serial ultrathin sectioning. We demonstrate the validity of this approach by examining the niche of individual transplanted cells from a population highly enriched for hemopoietic stem cells and the ultrastructural expression of two key stem cell regulatory molecules, hyaluronic acid and osteopontin. In addition, we describe the phenotypes of the surrounding cells.

One-step growth of centimeter-scale doped multilayer MoS2 films by pulsed laser-induced synthesis

2020 ◽  
Vol 8 (20) ◽  
pp. 6900-6905 ◽  
Author(s):  
Yishuo Hu ◽  
Xiangbin Zeng ◽  
Tingting Ren ◽  
Yonghong Xiao ◽  
Yang Zeng ◽  
...  
Keyword(s):  
Pulsed Laser ◽  
Similar Process ◽  
Key Technology ◽  
Innovative Method ◽  
One Step ◽  
Step Growth

This paper describes an innovative method known as pulsed laser induced synthesis to quickly and efficiently produce MoS2 films. Additionally, in situ doping of various elements can be realized via a similar process. This indicates that the proposed method will be a key technology contributing to the industrialization of MoS2 films and other TMDCs.

In-situ composition analysis of photochromic yttrium oxy-hydride thin films under light illumination

2019 ◽  
Vol 201 ◽  
pp. 110119 ◽  
Author(s):  
M.V. Moro ◽  
D. Moldarev ◽  
C.C. You ◽  
E.M. Baba ◽  
S.Zh. Karazhanov ◽  
...  
Keyword(s):  
Thin Films ◽  
Composition Analysis ◽  
Light Illumination

In Situ X-Ray Diffraction Measurements of the Apparent Modulus of Human Dental Tissue in the Vicinity of the Dentine-Enamel Junction (DEJ)

2015 ◽  
Vol 798 ◽  
pp. 339-343
Author(s):  
Tan Sui ◽  
Si Qi Ying ◽  
Nikolaos Baimpas ◽  
Gabriel Landini ◽  
Alexander M. Korsunsky
Keyword(s):  
Structure Property ◽  
X Ray Diffraction ◽  
Dental Tissue ◽  
X Ray ◽  
Apparent Modulus ◽  
Biological Interface ◽  
Dental Restorations ◽  
Structure Property Relationship ◽  
And Function

The dentine-enamel junction (DEJ) is an important biological interface between the highly mineralized hard out layer (enamel) and the comparatively softer tooth core (dentine) of teeth. The remarkable performance of this interface provides the motivation for investigation into the detailed structure and function of the DEJ. In this study, synchrotron X-ray diffraction measurements of the DEJ subjected to the in situ uniaxial loading were carried out to capture the structure-property relationship between the DEJ architecture and its response to the applied force. The knowledge of the architecture and properties of the natural DEJ will hopefully help in biomimetic engineering of superior dental restorations and prostheses, and the development of novel materials to emulate the DEJ.

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