Search results for: D ANGLOS

Items from 1 to 20 out of 43 results

chapter

Insulators' pollution problem: Experience from the coastal transmission system of Crete

N.C. Mavrikakis, E. Koudoumas, K. Siderakis, D. Pylarinos, more

2017 52nd International Universities Power Engineering Conference (UPEC) > 1 - 6

2017 52nd International Universities Power Engineering Conference (UPEC)

Pollution of insulators is one of the most significant problems that can affect the reliability of power systems. Several practices have been employed to improve the insulation performance under polluted conditions such as extending the creepage distance, using specially designed profiles, washing of insulators and using hydrophobic materials to manufacture insulators or to coat their surfaces. Depending...

chapter

Evaluating the Effectiveness of Lasers for the Removal of Overpaint from a 20th C Minimalist Painting

C. McGlinchey, C. Stringari, E. Pratt, M. Abraham, more

Springer Proceedings in Physics > Lasers in the Conservation of Artworks > Side Effects > 209-215

Recent results from laser cleaning studies on a painting from Ad Reinhardt’s “Black Square” series (1960’s) are presented. This painting, which travelled extensively, suffered various damages and at one stage was completely over-painted. Unfortunately, this overpaint is not reversible via traditional conservation methods and in this respect test cleanings have under a variety of more traditional conservation...

chapter

Analysis of Archaeological Objects with LMntI, a New Transportable LIBS Instrument

K. Melessanaki, A. Mastrogiannidou, S. Chlouveraki, S. C. Ferrence, more

Springer Proceedings in Physics > Lasers in the Conservation of Artworks > Spectroscopy for Monitoring and Identification > 443-449

The analysis of archaeological objects was carried out using LMntI (el-em-ent-one), a new Laser-Induced Breakdown Spectroscopy (LIBS) instrument. The main components and layout of the instrument are briefly described. Indicative results from the analysis of a wide variety of archaeological findings are presented.

article

Chemical analysis of industrial scale deposits by combined use of correlation coefficients with emission line detection of laser induced breakdown spectroscopy spectra

P. Siozos, A. Philippidis, M. Hadjistefanou, C. Gounarakis, more

Spectrochimica Acta Part B: Atomic Spectroscopy > 2013 > 87 > Complete > 86-91

Laser-induced breakdown spectroscopy (LIBS) was used to determine the mineral composition of various industrial scale samples. The aim of the study has been to investigate the capacity of LIBS to provide a fast, reliable analytical tool for carrying out routine analysis of inorganic scales, potentially on site, as a means to facilitate decision making concerning scale removal procedures. LIBS spectra...

article

Comparative study of laser induced breakdown spectroscopy and mass spectrometry for the analysis of cultural heritage materials

O. Kokkinaki, C. Mihesan, M. Velegrakis, D. Anglos

Journal of Molecular Structure > 2013 > 1044 > Complete > 160-166

Analysis by laser-induced breakdown spectroscopy (LIBS) is compared, on the basis of a hybrid experimental set-up, with laser ablation time-of-flight mass spectrometry (LA-TOF-MS) for the characterization of materials relevant to cultural heritage. The present study focuses on the analysis of selected paint materials such as lithopone, a white inorganic pigment, and two synthetic organic paint formulations,...

article

Adapting and testing a portable Raman spectrometer for SERS analysis of amino acids and small peptides

A. Brambilla, A. Philippidis, A. Nevin, D. Comelli, more

Journal of Molecular Structure > 2013 > 1044 > Complete > 121-127

Surface-Enhanced Raman Spectroscopy (SERS), a powerful spectrochemical technique enabling highly sensitive analysis of organic and biological materials, is investigated for applications in the analysis of archaeological materials including in situ screening. In this work, a compact mobile Raman spectrometer is employed for acquiring Surface-Enhanced Raman spectra from natural amino acids (l-Arg, l-Phe,...

chapter

Time resolved and spectral analysis of solar absorber Cu-Al and Al-Al laser weld emission

P. Siozos, A. D. Zervaki, H. Kamoutsi, G. N. Haidemenopoulos, more

2013 Conference on Lasers & Electro-Optics Europe & International Quantum Electronics Conference CLEO EUROPE/IQEC > 1

2013 Conference on Lasers & Electro-Optics Europe & International Quantum Electronics Conference CLEO EUROPE/IQEC

Solar water heating systems involve several innovations and a number of mature renewable energy technologies that enable efficient energy conversion. The thermal efficiency of solar heat collectors strongly depends on the metallurgical characteristics of the weld between the collector panel and the heat transfer tube. Typically, the welding quality is evaluated by empirical criteria, based, for instance,...

chapter

Electronic excitation mediated structuring of semiconducting oxides

L. Museur, D. Anglos, A. Kanaev

2012 IEEE International Conference on Oxide Materials for Electronic Engineering (OMEE) > 129 - 130

2012 IEEE International Conference on Oxide Materials for Electronic Engineering (OMEE)

Strong modifications of semiconducting oxides can be provoked by high-density electronic excitation above the Mott density. This regime corresponds to the manifestation of electron-hole plasma continuum. The nanostructuring of monocrystalline zinc oxide in this regime is correlated with elongation of the inter-crystalline planes and intensification of exciton photoluminescence.

article

Effect of ambient conditions on ultraviolet femtosecond pulse laser induced breakdown spectra

M.P. Mateo, V. Piñon, D. Anglos, G. Nicolas

Spectrochimica Acta Part B: Atomic Spectroscopy > 2012 > 74-75 > Complete > 18-23

In this work, the results of a study on the influence of buffer gas and pressure on the LIBS spectrum characteristics are reported. Ultraviolet femtosecond pulses were employed in the analysis of several solid samples including brass, copper, aluminum and silicon under different buffer gasses: air, argon and helium. Given a buffer gas, ambient pressure was varied and its effect on the intensity and...

chapter

Long period optical fiber grating outcladding overlaid sensors: A versatile photonic platform for health and bio applications

S. Pissadakis, D. Anglos, A. Klini, M. Konstantaki

2011 International Workshop on Biophotonics > 1 - 3

2011 International Workshop on Biophotonics

Long period fiber gratings with suitable thin film overlayers can constitute a strong platform for the development of versatile and multi-functional sensing devices for serving diverse Biological and Health monitoring applications. Herein, we present three cases of thin film overlaid long period gratings that can find direct application in health related applications: the first example refers to a...

chapter

An optical fiber long-period grating sensor for organic vapors utilizing a ZnO nanorod out-cladding

A. Klini, M. Konstantaki, D. Anglos, S. Pissadakis

2011 Conference on Lasers and Electro-Optics Europe and 12th European Quantum Electronics Conference (CLEO EUROPE/EQEC) > 1

2011 Conference on Lasers & Electro-Optics Europe & 12th European Quantum Electronics Conference CLEO EUROPE/EQEC

Zinc oxide (ZnO) is one of the most favorable and efficient oxide materials[1] in the detection of organic vapors and has been successfully used in the detection of ethanol[2] and gasoline. Furthermore, optical fiber Long Period Gratings (LPG) with a chemo- or hygro-sensitive layer deposited as outcladding coating can provide all-optical sensing capabilities[3]. Here we present a novel organic vapor...

article

The potential use of plume imaging for real-time monitoring of laser ablation cleaning of stonework

A. Khedr, V. Papadakis, P. Pouli, D. Anglos, more

Applied Physics B > 2011 > 105 > 2 > 485-492

In this work, the potential of plume imaging was investigated as a real-time monitoring technique for the control of the laser cleaning process in cultural heritage objects with emphasis on encrusted stonework. Optical pulses generated by Nd:YAG laser were used to remove a high absorbing layer of crust from the surface of a lower absorbing marble substrate. Two regimes of operation have been employed...

article

Nanosecond and femtosecond ablation of La_0.6Ca_0.4CoO₃: a comparison between plume dynamics and composition of the films

S. Canulescu, E. Papadopoulou, D. Anglos, T. Lippert, more

Applied Physics A > 2011 > 105 > 1 > 167-176

Thin films of La_0.6Ca_0.4CoO₃ were grown by pulsed laser ablation with nanosecond and femtosecond pulses. The films deposited with femtosecond pulses (248 nm, 500 fs pulse duration) exhibit a higher surface roughness and deficiency in the cobalt content compared to the films deposited with nanosecond pulses (248 nm, 20 ns pulse duration). The origin of these pronounced differences between the films...

article

Spectroscopic features in relation to corneal hydration during excimer laser ablation

HS GINIS, M MAKRIDAKI, D ANGLOS, IG PALLIKARIS

Acta Ophthalmologica > 88 > s246 > 0 - 0

Purpose To record the spectrum emitted during excimer laser‐cornea interaction at fluences intensities resulting to ablation and investigate the relation between its spectroscopic features and corneal hydration. Methods Porcine corneas from eyes obtained from a local abattoir were used for the experiments. The corneal samples were de‐epithelialized and the stroma was irradiated with an ArF excimer...

article

Optical emission studies of plasma induced by single and double femtosecond laser pulses

V. Piñon, D. Anglos

Spectrochimica Acta Part B: Atomic Spectroscopy > 2009 > 64 > 10 > 950-960

Double-pulse femtosecond laser ablation has been shown to lead to significant increase of the intensity and reproducibility of the optical emission signal compared to single-pulse ablation particularly when an appropriate interpulse delay is selected, that is typically in the range of 50–1000ps. This effect can be especially advantageous in the context of femtosecond laser-induced breakdown spectroscopy...

article

Pyrolytic formation and photoluminescence properties of a new layered carbonaceous material with graphite oxide-mimicking characteristics

A.B. Bourlinos, V. Georgakilas, R. Zboril, A. Bakandritsos, more

Carbon > 2009 > 47 > 2 > 519-526

Thermal carbonization of bis(2-chloroethyl)amine hydrochloride at 260°C in air leads to a new, functional layered carbonaceous material that, although different in structure and composition, shares similar characteristics as the well-known graphite oxide. Specifically, the molecularly derived carbonaceous solid is layered with relatively small lateral dimensions, highly dispersible in water providing...

article

Effect of experimental conditions on surface hardness measurements of calcified tissues via LIBS

Z. A. Abdel-Salam, Z. Nanjing, D. Anglos, M. A. Harith

Applied Physics B > 2009 > 94 > 1 > 141-147

This paper reports on the effects of LIBS experimental conditions on the measurement of the surface hardness of calcified tissues. The technique mainly depends on a previously demonstrated correlation between the intensity ratio of ionic to atomic spectral lines and the hardness of the target material. Three types of calcified tissues have been examined, namely enamel of human teeth, shells, and eggshells...

article

Double pulse laser-induced breakdown spectroscopy with femtosecond laser pulses

V. Piñon, C. Fotakis, G. Nicolas, D. Anglos

Spectrochimica Acta Part B: Atomic Spectroscopy > 2008 > 63 > 10 > 1006-1010

This paper presents results obtained in a study of collinear geometry double pulse femtosecond LIBS analysis of solids in ambient environment. LIBS signal enhancement of 3–10 fold, accompanied by significant improvement of signal reproducibility, in comparison with the single pulse case, has been found in different samples such as brass, iron, silicon, barium sulfate and aluminum when an optimum temporal...

article

A compact and portable laser-induced breakdown spectroscopy instrument for single and double pulse applications

J. Goujon, A. Giakoumaki, V. Piñon, O. Musset, more

Spectrochimica Acta Part B: Atomic Spectroscopy > 2008 > 63 > 10 > 1091-1096

We present LIBS experimental results that demonstrate the use of a newly developed, compact, versatile pulsed laser source in material analysis related to art and archaeological applications in view of research aiming at the development of portable LIBS instrumentation. LIBS qualitative analysis measurements were performed on various samples and objects, and the spectra were recorded in gated and...

article

Characterization of Iron age pottery from eastern Turkey by laser- induced breakdown spectroscopy (LIBS)

A. Erdem, A. Çilingiroğlu, A. Giakoumaki, M. Castanys, more

Journal of Archaeological Science > 2008 > 35 > 9 > 2486-2494

Selected pottery sherds coming from the Ayanis, Dilkaya and Karagündüz excavations in eastern Turkey and dated from the Early to Middle Iron Age were examined as regards their composition by using laser-induced breakdown spectroscopy (LIBS). The objective of the study was first to investigate the potential of the LIBS technique in the compositional analysis of pottery and further to explore correlations...

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INFONA - science communication portal

Search results for: D ANGLOS

Insulators' pollution problem: Experience from the coastal transmission system of Crete

Evaluating the Effectiveness of Lasers for the Removal of Overpaint from a 20th C Minimalist Painting

Analysis of Archaeological Objects with LMntI, a New Transportable LIBS Instrument

Chemical analysis of industrial scale deposits by combined use of correlation coefficients with emission line detection of laser induced breakdown spectroscopy spectra

Comparative study of laser induced breakdown spectroscopy and mass spectrometry for the analysis of cultural heritage materials

Adapting and testing a portable Raman spectrometer for SERS analysis of amino acids and small peptides

Time resolved and spectral analysis of solar absorber Cu-Al and Al-Al laser weld emission

Electronic excitation mediated structuring of semiconducting oxides

Effect of ambient conditions on ultraviolet femtosecond pulse laser induced breakdown spectra

Long period optical fiber grating outcladding overlaid sensors: A versatile photonic platform for health and bio applications

An optical fiber long-period grating sensor for organic vapors utilizing a ZnO nanorod out-cladding

The potential use of plume imaging for real-time monitoring of laser ablation cleaning of stonework

Nanosecond and femtosecond ablation of La_0.6Ca_0.4CoO₃: a comparison between plume dynamics and composition of the films

Spectroscopic features in relation to corneal hydration during excimer laser ablation

Optical emission studies of plasma induced by single and double femtosecond laser pulses

Pyrolytic formation and photoluminescence properties of a new layered carbonaceous material with graphite oxide-mimicking characteristics

Effect of experimental conditions on surface hardness measurements of calcified tissues via LIBS

Double pulse laser-induced breakdown spectroscopy with femtosecond laser pulses

A compact and portable laser-induced breakdown spectroscopy instrument for single and double pulse applications

Characterization of Iron age pottery from eastern Turkey by laser- induced breakdown spectroscopy (LIBS)

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