Search results

1

Emission characteristics of laser ablation-hollow cathode glow discharge spectral source

100%

Karatodorov S., Mihailov V., Grozeva M.

Open Chemistry

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2015

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vol. 13

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issue 1

EN

The emission characteristics of a scheme combining laser ablation as sample introduction source and hollow cathode discharge as excitation source are presented. The spatial separation of the sample material introduction by laser ablation and hollow cathode excitation is achieved by optimizing the gas pressure and the sample-cathode gap length. At these conditions the discharge current is maximized to enhance the analytical lines intensity.

2

Comparative study of ZnO layers prepared by PLD from different targets at various oxygen pressure levels

100%

HaÅ¡ko D., Bruncko J., Vincze A., Uherek F. e.

Open Physics

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2009

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vol. 7

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issue 2

345-349

EN

Two series of polycrystalline zinc oxide (ZnO) layers, from Zn or ZnO targets, were grown on silicon (1 1 1) substrates by pulsed laser deposition (PLD) at ambient oxygen pressure levels, stepwise increased from 1 to 35 Pa. For ablation of targets, a pulsed Nd:YAG laser was used. The structural and morphological properties of the layers were investigated by scanning electron microscopy (SEM), atomic force microscopy (AFM), and secondary ion mass spectrometry (SIMS). The SEM images of ZnO layers in SE mode show a uniform granular structure and modified surface morphology, depending on oxygen pressure. The mean grain size in height and lateral directions decreases with an increase of oxygen pressure from 1 to 5 Pa, while a subsequent rise of oxygen pressure from 5 to 35 Pa will cause an increase in the grain size. The AFM measurement revealed that the surface structures of zinc oxide layers grown from different targets were similar, and the layers formed at an ambient oxygen pressure of 5 Pa exhibited the smallest values of calculated roughness and granularity. SIMS depth profiling analyses confirmed that the ZnO composition was homogenous across the layer, up to the abrupt change of chemical composition at the interface between the ZnO layer and the Si substrate.

3

T-junction droplet generator realised in lithium niobate crystals by laser ablation

88%

Pozza G., Kroesen S., Bettella G., Zaltron A., Esseling M., Mistura G., Sartori P., Chiarello E., Pierno M., Denz C., Sada C.

Optofluidics, Microfluidics and Nanofluidics

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2014

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vol. 1

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issue 1

EN

A femtosecond laser at 800 nm was used to create micro-fluidic circuits on lithium niobate (LiNbO3) substrates by means of laser ablation, using different scanning velocities (100-500 μm/s) and laser pulse energies (1-20 μJ). The T-junction geometry was exploited to create on y-cut LiNbO3 crystals a droplet generator, whose microfluidic performance was characterized in a wide range of droplet generation frequencies, from few Hz to about 1 kHz.

4

Growth and characterization of pulsed laser deposited ZnO thin films

75%

Vincze A., Bruncko J., Michalka M., Figura D.

Open Physics

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2007

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vol. 5

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issue 3

385-397

EN

One of the most important and promising materials from metal oxides is ZnO with specific properties for near UV emission and absorption optical devices. The properties of ZnO thin films strongly depend on the deposition method. Among them, pulsed laser deposition (PLD) plays an important role for preparing various kinds of ZnO films, e.g. doped, undoped, monocrystalline, and polycrystalline. Different approaches - ablation of sintered ZnO pellets or pure metallic Zn as target material are described. This contribution is comparing properties of ZnO thin films deposited from pure Zn target in oxygen atmosphere and those deposited from sintered ZnO target. There is a close connection between final thin film properties and PLD conditions. The surface properties of differently grown ZnO thin films are measured by secondary ion mass spectrometry (SIMS), atomic force microscopy (AFM) and scanning electron microscopy (SEM). Furthermore, different approaches - ablation of sintered ZnO pellet or pure metallic Zn as target materials are described. The main results characterize typical properties of ZnO films versus technological parameters are presented.

5

Nanocrystalline Cr/CrN and Ti/TiN multilayer coatings produced by pulsed laser deposition at room temperature

75%

Lackner J. M., Waldhauser W., Major L., Morgiel J., Kot M., Major B.

Bulletin of the Polish Academy of Sciences: Technical Sciences

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2006

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vol. 54

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issue 2

6

Recent advances on diagnosis and treatment of osteoid osteoma

51%

Gryglewski K., Napora J., Wałejko S., Mazurek T.

Chirurgia Narządów Ruchu i Ortopedia Polska

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2022

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vol. 87

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issue 1

25-31

PL

Kostniak kostnawy jest nowotworem łagodnym o charakterystycznym ognisku (nidus) w badaniach radiologicznych. Najczęstszym objawem prowadzącym do jego rozpoznania jest silny, nocny ból, reagujący na niesteroidowe leki przeciwzapalne. Tomografia komputerowa jest metodą z wyboru w diagnostyce i lokalizacji zmiany. Kostniak kostnawy może wygoić się samoistnie, toteż leczenie zachowawcze jest jedną z metod postępowania. Resekcja otwarta była standardowym leczeniem kostniaka kostnawego do czasu wprowadzenia termoablacji prądem wysokiej częstotliwości (RFA) na początku lat 90. XX wieku. Obecnie istnieje kilka metod leczenia małoinwazyjnego. RFA pod kontrolą tomografii komputerowej jest aktualnie uważana za złoty standard terapeutyczny leczenia kostniaka kostnawego. W wielu przypadkach występuje znaczne opóźnienie pomiędzy początkiem charakterystycznych objawów a postawieniem prawidłowej diagnozy i skutecznym wyleczeniem. W związku z tym istotna jest znajomość obrazu klinicznego, prawidłowy dobór metod diagnostycznych i leczniczych.

EN

Osteoid osteoma (OO) is a benign bony lesion with a characteristic radiologic feature of x-ray focus (nidus). The most common symptom indicating diagnosis is strong nocturnal pain that eases with nonsteroidal anti-inflammatory drugs (NSAID). Computed tomography (CT) is a method of choice for diagnosing and localizing the tumor. Osteoid osteoma can regress spontaneously, thus conservative treatment is one of the methods of choice. In the past open resection surgery had been a standard management of osteoid osteoma until radiofrequency ablation (RFA) was discovered in the early 1990s. Nowadays, there are a few minimally invasive treatment techniques that are used. CT-guided radiofrequency ablation is considered a gold standard technique these days. Many cases occur with late diagnosis, and delayed treatment despite of characteristic symptoms. Therefore, it is crucial to be familiar with the clinical features of osteoid osteoma, proper diagnostic patterns, and treatment schemes.

Refine search results

Emission characteristics of laser ablation-hollow cathode glow discharge spectral source

Comparative study of ZnO layers prepared by PLD from different targets at various oxygen pressure levels

T-junction droplet generator realised in lithium niobate crystals by laser ablation

Growth and characterization of pulsed laser deposited ZnO thin films

Nanocrystalline Cr/CrN and Ti/TiN multilayer coatings produced by pulsed laser deposition at room temperature

Recent advances on diagnosis and treatment of osteoid osteoma