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    Wyświetlanie 1-12 z 12
    Tytuł:
    Quality of marks on metals made with the use of the Nd:YAG laser engraving method
    Jakość znaków na materiałach metalowych wykonanych metodą grawerowania wiązką lasera Nd:YAG
    Autorzy:
    Tuz, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/263760.pdf
    Data publikacji:
    2013
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    laser engraving
    laser marking
    N&.YAG laser
    metals
    grawerowanie laserowe
    znakowanie laserowe
    metale
    lasery Nd:YAG i He-Ne
    Opis:
    The results of the investigation concerning the influence of engraving parameters on the mark quality and material removal rates from panels made by different types of metals by the Q-switched diode-pumped Nd:YAG laser are presented in this paper. Quality of marks is examined by considering readability and durability as the function of material removed and parameters. The parameters under consideration are: the average power, pulse frequency and surface scanning velocity. The results disclosed that laser engraving can be applied in marking metals successfully.
    Przedstawiono wyniki badań dotyczących wpływu parametrów grawerowania na ja-kość znaku i szybkość usuwania materiału z płyt wykonanych z różnych metali. Jakość znaków rozważano pod względem ich czytelności i trwałości oraz w funkcji odwzorowania zadanego kształtu przy różnych parametrach procesu. Parametrami branymi pod uwagę były: średnia moc, częstotliwość impulsów i prędkość skanowania powierzchni. Wyniki ujawniły, że grawerowanie laserowe może być stosowane z powodzeniem w znakowaniu metali.
    Źródło:
    Metallurgy and Foundry Engineering; 2013, 39, 1; 55-64
    1230-2325
    2300-8377
    Pojawia się w:
    Metallurgy and Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mechanism of nanostructure formation on a surface of CdZnTe crystal by laser irradiation
    Autorzy:
    Medvid', A.
    Mychko, A.
    Gnatyuk, V. A.
    Levytskyi, S.
    Naseka, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/385161.pdf
    Data publikacji:
    2009
    Wydawca:
    Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
    Tematy:
    self-organizing structure
    Nd:YAG laser
    CdZnTe crystal
    Opis:
    Self-organizing nanometer size structures are observed on the surface of CdZnTe crystal irradiated by strongly absorbed Nd:YAG laser irradiation (LR) at intensity range of 4-12 MW/cm2. According to this model the Thermogradient effect has the main role in the interaction process of LR and semiconductors. The surface state of the CdZnTe under the influence of Nd:YAG laser irradiation has been studied. A state has been defined by atom force microscope. The influence of LR on the photoluminescence spectrahas show that at a threshold intensity of LR I=4 MW/cm2 creation of nanometer size structure begins. A graded band gap structure with optical window was formed at the top of nano-hills.
    Źródło:
    Journal of Automation Mobile Robotics and Intelligent Systems; 2009, 3, 4; 127-129
    1897-8649
    2080-2145
    Pojawia się w:
    Journal of Automation Mobile Robotics and Intelligent Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Formation of "black silicon" on a surface of Ni/Si structure by Nd:YAG laser radiation
    Autorzy:
    Medvid', A.
    Karabko, A.
    Onufrijevs, P.
    Dauksta, E.
    Dostanko, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/385280.pdf
    Data publikacji:
    2009
    Wydawca:
    Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
    Tematy:
    black silicon
    self-organization
    microstructures
    Nd:YAG laser
    Opis:
    We have shown the possibility to form a new type of material known as "black silicon". After irradiation of a Si sample surface, covered with 30 nm thick Ni layer, by Nd: YAG laser beam at intensity 4.5 MW/cm2 the "black silicon" was formed. The formation and self-organization of conelike microstructures on the Ni/Si surface has been detected by scanning electron microscope (SEM). Light is repeatedly reflected between the cones in the way that most of it is absorbed, therefore the surface becomes like a "black body" absorber. The micro-chemical analysis performed on SEM has shown that the microstructures contain NiSi2. This was approved by presence of LO phonon line in Raman back scattering spectrum. The control of micro-cone shape and height was achieved by changing the laser intensity and number of pulses.
    Źródło:
    Journal of Automation Mobile Robotics and Intelligent Systems; 2009, 3, 4; 140-142
    1897-8649
    2080-2145
    Pojawia się w:
    Journal of Automation Mobile Robotics and Intelligent Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modeling and optimization of the YAG:Yb microchip laser passively Q-switched by YAG:Cr absorber
    Autorzy:
    Buryy, O
    Ubizskii, S
    Powiązania:
    https://bibliotekanauki.pl/articles/175041.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    Yb:YAG crystal
    microlaser
    Q-switching
    numerical simulation
    Opis:
    Based on analytical and numerical solutions of the rate equations system and the heat conductivity equation, the model of the quasi-three-level passively Q-switched YAG:Yb/YAG:Cr microchip laser is developed. The obtained results are used for its optimization, i.e., for the determination of the output mirror reflectivity, the pumping beam radius, the thickness of the absorber and the phototropic centers concentration maximizing the energy in the laser pulse. The influence of the thermal load on the spatial parameters of the laser beam is also determined.
    Źródło:
    Optica Applicata; 2014, 44, 4; 621-636
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of mechanochemical processing to synthesis of YAG: Ce garnet powder
    Zastosowanie procesu aktywacji mechanochemicznej do syntezy oranatu itrowo-olinowego domieszkowanego cerem
    Autorzy:
    Michalik, D.
    Sopicka-Lizer, M.
    Plewa, J.
    Pawlik, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/352958.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    proces mechanochemiczny
    luminescencja
    YAG
    mechanochemical processing
    phosphor
    Ce garnet
    Opis:
    The paper presents the method of preparation YAG: Ce precursor powder with ability for synthesis at lower temperature. Mechanochemical processing of an initial powder mixture was used as a preliminary step for subsequent high-temperature treatment of the precursor. The specific surface area, phase composition and luminescence properties were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM) and photoluminescence (PL) spectroscopy. It has been shown that YAG structure formed at lower temperature by 300°C in comparison to the reference specimen but luminescence intesity was dependant on temperature of powder synthesis. The highest luminescence intensity was observed for powders synthesised at 1650°C.
    W artykule przedstawiono otrzymywanie proszku granatu YAG:Ce z zastosowaniem zmodyfikowanej metody reakcji w stanie stałym. Mieszanina proszków wyjściowych została poddana procesowi aktywacji mechanochemicznej celem zwiększenia jego reaktywności podczas syntezy wysokotemperaturowej. Zbadano wpływ aktywacji na powierzchnie właściwą wyjściowej mieszaniny proszków. Proszek wygrzewany w różnych temperaturach został poddany analizie fazowej (XRD) oraz obserwacji na mikroskopie skaningowym (SEM). Zbadano niektóre właściwości optyczne: absorpcje i luminescencje przy wzbudzeniu alpha=450 nm. Wykazano, że w wyniku aktywacji mechanochemicznej proszku wyjściowego YAG następuje obniżenie temperatury otrzymywania jednofazowego granatu itrowo-glinowego o 300 C, natomiast intensywność luminescencji zależała od temperatury syntezy; najwyższą uzyskano po syntezie w 1650 C.
    Źródło:
    Archives of Metallurgy and Materials; 2011, 56, 4; 1257-1264
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Development of an automation system for iodine-125 brachytherapy seed encapsulated by Nd:YAG laser welding
    Autorzy:
    Somessari, S. L.
    Feher, A.
    Sprenger, F. E.
    Rostelato, M. E. C. M.
    da Costa, F. E.
    Calvo, W. A. P.
    Powiązania:
    https://bibliotekanauki.pl/articles/147664.pdf
    Data publikacji:
    2011
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    iodine-125 seeds
    prostate cancer
    brachytherapy
    Nd:YAG laser welding
    Opis:
    The aim of this work is to develop an automation system for iodine-125 radioactive seed production by Nd:YAG laser welding, which has been used successfully in low dose rate (LDR) brachytherapy treatment. This small seed consists of a welded titanium capsule, with 0.8 mm in diameter and 4.5 mm in length, containing iodine-125 adsorbed onto a silver rod. The iodine-125 seeds are implanted into the human prostate to irradiate the tumor for cancer treatment. Nowadays, the Radiation Technology Center, at Institute for Nuclear and Energy Research, Săo Paulo, Brazil (IPEN-CNEN/SP) imports and distributes 36,000 iodine-125 seeds per year, for the clinics and hospitals in the country. However, the Brazilian market potential is now over 8,000 iodine-125 seeds per month. The local production of these iodine-125 radioactive sources became a priority for the Institute, in order to reduce the price and the problems of prostate cancer management. It will permit to spread their use to a larger number of patients in Brazil. On the other hand, the industrial automation plays an important role for iodine-125 seeds in order to increase the productivity, with high quality and assurance, avoiding human factors, implementing and operating with good manufacturing practices (GMP). The technology consists of appliance electronic and electro-mechanical parts and components to control machines and processes. The automation system technology for iodine-125 seed production developed in this work was mainly assembled employing a programmable logic controller (PLC), a stepper motor, an Nd:YAG laser welding machine and a supervisory. The statistical repeatability of correctly encapsulated sealed sources with this automation system is greater than 95 per cent.
    Źródło:
    Nukleonika; 2011, 56, 4; 369-374
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The MAS NMR study of solid solutions based on the YAG crystal
    Autorzy:
    Padlyak, B. V.
    Sergeev, N. A.
    Olszewski, M.
    Stępień, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/971533.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    27Al MAS NMR
    local structure
    solid solutions
    yttrium-aluminum garnet (YAG)
    Opis:
    An 27Al magic angle spinning (MAS) nuclear magnetic resonance (NMR) study of nominally pure and Cr-doped yttrium-aluminum garnet (Y3Al5O12 and Y3Al5O12:Cr) crystals is reported. It has been shown that the doping by Cr of the Y3Al5O12 crystals leads to the variation of the occupation by Al atoms both octahedrally and tetrahedrally coordinated sites of the garnet lattice.
    Źródło:
    Nukleonika; 2015, 60, No. 3, part 1; 417-421
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pulsed laser induced potassium oxide plasma analyzed by optical emission spectrum technique
    Autorzy:
    Khalaf, Madyan A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1193329.pdf
    Data publikacji:
    2021
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Laser - Induced Plasma (LIP)
    Nd:YAG laser
    Optical Emission Spectroscopic
    potassium oxide plasma
    Opis:
    In this work, a spectroscopic research on laser-produced potassium oxide plasma using optical emission spectroscopy (OES) technology is provided. Laser-induced K2O plasma produced at various laser energy has also been defined by visible emission spectroscopy. Plasma is created by a solid potassium oxide object radiated by a pulsed laser in a room environment. A Nd:YAG laser pulse 9 ns in duration with wavelength of (532) nm and a focal length of (10) cm in the range of energy (300-700) mJ is used to generate plasma from a planar K2O sample. The electron temperature (Te) was calculated in ratio line intensities method, while the electron density (ne) was calculated using Saha-Boltzmann equation, also another plasma parameters was calculated such as plasma (fp), Debye length (λD) and Debye number (ND). The increase in electron temperature and density was observed as a function of laser energies. Measurement of the production of the electron temperature in the rang (0.996-1.202) eV, While the electron density is in the rang (1.8×1016-8.8×1016) cm-3.
    Źródło:
    World Scientific News; 2021, 153, 2; 192-204
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Laser interference patterning of diamond-like carbon layers for directed migration and growth of smooth muscle cell depositions
    Autorzy:
    Marczak, J.
    Kusinski, J.
    Major, R.
    Rycyk, A.
    Sarzynski, A
    Strzelec, M.
    Czyz, K
    Powiązania:
    https://bibliotekanauki.pl/articles/174984.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    laser interference lithography
    Nd
    YAG laser
    diamond-like carbon (DLC) structuring
    biocompatible scaffolds
    Opis:
    Seeding of cells on functional, biocompatible scaffolds is a crucial step in achieving the desired engineered tissue. The authors show the constructional solutions of the Nd:YAG pulse laser system with the Q-switch modulation for direct and interferential shaping of the surface of biocompatible materials. The two-channel interference system is distinguished by high control, simplicity and repetitiveness regarding laser energy level and dimensions of the surface structures. The experiments were conducted on hard, biocompatible substrates of amorphous carbon (diamond-like carbon, DLC) and were preliminarily tested on smooth muscle cell depositions.
    Źródło:
    Optica Applicata; 2014, 44, 4; 575-586
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Verify the plasma parameters generated from the Tin material using the laser-induced plasma technique
    Autorzy:
    Ahmed, Baida M.
    Aadim, Kadhim A.
    Khalaf, Madyan A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1030607.pdf
    Data publikacji:
    2020
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Laser-Induced Plasma (LIP)
    Nd:YAG laser
    Optical Emission Spectroscopic (OES)
    Tin (Sn)
    Opis:
    In this work, A spectroscopic research on laser-produced tin plasma using optical emission spectroscopy (OES) technology is provided. Laser-induced Sn plasma produced at various laser energy has also been defined by visible emission spectroscopy. Plasma is created by a solid tin object radiated by a pulsed laser in a room environment. A Nd:YAG laser pulse 9 ns in duration with wavelength of 1064 nm and a focal length of 10 cm in the range of energy 500-800 mJ is used to generate plasma from a planar Sn sample. The electron temperature (Te) was calculated in ratio line intensities method, while the electron density (ne) was calculated using Saha-Boltzmann equation, also another plasma parameters was calculated such as plasma (fp), Debye length (λD) and Debye number (ND). The increase in electron temperature and density was observed as a function of laser energies. Measurement of the production of the electron temperature in the rang 0.926-0.952 eV, While the electron density is in the rang (1.9×1015-2.5×1015) cm-3.
    Źródło:
    World Scientific News; 2020, 144; 326-337
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Zno Nano Material Interaction With Nd:YAG Laser Under Vacuum
    Autorzy:
    Hussam, N. Mohammed Ali
    Yahya, Abdulkreem Salman
    Powiązania:
    https://bibliotekanauki.pl/articles/1179694.pdf
    Data publikacji:
    2017
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Langmuir probe
    Nd:YAG laser etching
    Plasma generation
    ZnO nanomaterial
    electron density
    electron temperature
    Opis:
    The goal of this paper is to study the Nd:YAG laser interaction with the ZnO nanomaterial by etching the ZnO nanodisc surface. The preparation of ZnO nanodisc is studied also and the setup which we use in previous experiment published in the (IJRRR, Vol. X, Issue 1, March 2017) is used also. The interaction is done under vacuum conditions with high pressure in the range of (10-3) Tor. The main target of the paper is to study the plasma generated from the etching of the ZnO nanodisc by Nd:YAG laser.
    Źródło:
    World Scientific News; 2017, 72; 248-255
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Shielding Gas Composition on Geometry and Austenite Formation in Low Power Pulsed Nd:YAG Laser Welded 2205 Duplex Stainless Steel
    Autorzy:
    Gozarganji, Hajibaba, E.
    Farnia, A.
    Ebrahimnia, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2049428.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    low power pulsed Nd:YAG laser welding
    duplex stainless steel
    shielding gas
    nitrogen
    austenite formation
    Opis:
    This paper presents an investigation into effect of nitrogen content of shielding gas mixture on weld geometry, microstructure and hardness of pulsed laser welded 2205 duplex stainless steel. Full penetration autogenous welding was performed on 2 mm thick plates using a low power pulsed Nd: YAG laser. light and scanning electron microscopy were used to study the resulting microstructures. It is observed that 2 mm full penetrated joint decreases to 1.8 mm by dominating nitrogen in argon-nitrogen mixture. Different morphologies of austenite phase as well as an increase of 8% of its content can be observed in pure nitrogen shielded welds. Average weld grain size in sample which is welded in nitrogen atmosphere stands at approximately 41 μm which is smallerthan that of argon atmosphere which is about 51 μm. Micro-hardness test reveals that hardness values increase from 280 HV in base metal to 307 HV in weld center line and the shielding gas mixture does not significantly influence the weld hardness.
    Źródło:
    Archives of Metallurgy and Materials; 2021, 66, 1; 187-195
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-12 z 12

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