Temat: 52.50.Jm - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Laser Microstructure Modification of Metallic Materials
Autorzy:: Major, B.
Ciach, R.
Ebner, R.
Jeglitsch, F.
Tematy:: 52.50.Jm
64.70.Dv; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1945160.pdf Link otwiera się w nowym oknie
Opis:: Structure changes in laser constituted surface layers of aluminium alloys of the systems: Al-Zn, Al-Fe, Al-Fe-Ni, Al-Si were examined. Significant structure refinements and even formation of characteristic precipitates for rapidly quenched microstructure were found. Fine martensitic microstructure was observed in constructional steels of the types: X45CrSi92 (H9S2) and C50 (50G) subject to a laser modification. The study of influence of the chemical composition on the solidification structure and hardness was carried out on a steel 45, as well as on a high speed steel M2 (SW7M), by laser alloying using carbides of the types: VC, Mo$\text{}_{2}$C and the borides of the types: CrB, VB$\text{}_{2}$, B$\text{}_{4}$C. Thermodynamic calculations of phase diagrams were made to predict the changes of the constitution due to laser alloying. A comparison of the solidification structures and the calculated phase diagrams revealed a good agreement, especially for carbides. Boride alloying led to very complex microstructures consisting of various metallic and intermetallic phases.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Free Electrons Generation in the Interaction of Intense Laser Pulses with Atomic Clusters
Autorzy:: Rusek, M.
Orłowski, A.
Tematy:: 32.80.-t
36.40.Gk
52.50.Jm; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/2041831.pdf Link otwiera się w nowym oknie
Opis:: Interaction of argon clusters with intense laser pulses is studied theoretically. Free electrons energy distribution is studied. Differences between infrared and vacuum ultraviolet frequency regimes are pointed out. Clear physical interpretation of the obtained results is given.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Contact Microscopy using a Compact Laser Produced Plasma Soft X-Ray Source
Autorzy:: Ayele, M.
Czwartos, J.
Adjei, D.
Wachulak, P.
Ahad, I.
Bartnik, A.
Wegrzynski, Ł.
Szczurek, M.
Jarocki, R.
Fiedorowicz, H.
Lekka, M.
Pogoda, K.
Gostek, J.
Tematy:: 52.50.Jm
68.37.Yz
85.40.Hp; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1398826.pdf Link otwiera się w nowym oknie
Opis:: Soft X-ray contact microscopy potentially allows imaging of wet living biological specimens at a spatial resolution higher than optical microscopy and without many of the constraints of scanning electron microscopy. In this paper, we present the development of a laboratory scale contact microscope that uses a laser produced plasma soft X-ray source. The source is based on a double-stream gas-puff target approach and it operates in the "water window" spectral range which enables to capture images of biological samples with a natural contrast. In the preliminary experiments the contact microscope system has been used for imaging of fixed and dried non-malignant HCV29 human bladder cell lines cultured on polymethyl methacrylate photoresists. The samples were exposed with 150 pulses of soft X-rays as an initial test to demonstrate the possibility of image formation. The soft X-ray contact images registered in the photoresists exhibit high resolution in the atomic force microscopy topography which indicates the potential application of soft X-ray contact microscopy in life science to examine small features as small as few tens of nm. The technique could also be used for living cell imaging with further optimization of the microscope system and development of a special specimen holder. The details of the soft X-ray contact microscopy technique and the experimental results are presented and discussed.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Time-Resolved X-Ray Diffraction Studies on Biological Systems
Autorzy:: Rapp, G.
Tematy:: 61.10.-i
87.80.+s
52.50.Jm; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1920834.pdf Link otwiera się w nowym oknie
Opis:: Understanding of biological function requires knowledge both on structural and dynamical aspects. The aim of time-resolved X-ray diffraction is to combine structural and kinetic methods by monitoring structural or conformational changes within a single protein or assemblies of proteins during their biological action in real time. This requires (i) a powerful X-ray source, (ii) appropriate detectors capable of dealing with high local and total count rates and (iii) a suitable trigger mechanism. These aspects are briefly discussed with emphasis on light as trigger for initiation of structural or conformational changes. Examples are presented on muscle contraction, lipid phase transitions, the photocycle of bacteriorhodopsin and the application of Laue crystallography on the protein p21.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Study on the Breakdown Mechanism of Fabrication of Micro Channels in Fused Silica Substrates with ps Laser Pulses
Autorzy:: Li, S.
Bai, Z.
Qin, S.
Tematy:: 52.50.Jm
52.40.Hf
61.80.-x
42.62.-b; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1400288.pdf Link otwiera się w nowym oknie
Opis:: A new microchannel fabrication technology for fused silica substrate is presented. A mode-locked laser was used to fabricate straight microchannels in a fused silica substrate by laser plasma-induced plasma. The depth of the channels is up to 5 mm and there are no thermal cracks around the channel. We studied the ionization mechanism of optical breakdown formed by laser pulses and discussed the optical breakdown threshold. A mechanism is proposed to explain the formation of the microchannels and the characteristics of the microchannels are analyzed through the laser pulse characteristics.
Dostawca treści:: Biblioteka Nauki

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