Wyniki wyszukiwania - BazTech

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Właściwości skóry ludzkiej uzyskane w testach mechanicznych i techniką spektroskopii Ramana

Szotek S., Będziński R., Kobielarz M., Gąsior-Głogowska M., Komorowska M., Maksymowicz K., Hanuza J., Hermanowicz K.

Engineering of Biomaterials

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2009

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Vol. 12, no. 89-91

207--209

PL

Celem przeprowadzonych badań było porównanie charakterystyk otrzymanych: w testach wytrzymałościowych i z pomiarów spektroskopowych. W pracy wyznaczono podstawowe parametry mechaniczne skóry, które są zdeterminowane ułożeniem włókien kolagenowych. Następnie zarejestrowano widma ramanowskie badanej tkanki, zidentyfikowano pasma charakterystyczne dla białka kolagenowego. Na podstawie analizy uzyskanych wyników, dla kolejnych etapów rozciągnięcia skóry, zaobserwowano między innymi różnice w położeniu maksimum pasma amidu I (1658cm-1) w zależności od kierunku rozciągania próbki. Porównanie, w obu metodach charakterystycznych zakresów, zachodzących zmian wykazało możliwość stosowania Spektroskopii Ramana w celu wyznaczenia kierunku ułożenia włókien kolagenowych w trakcie rozciągania co jest istotne z punktu widzenia przeszczepów skóry.

EN

The aim of the investigations was to compare the characteristics obtained from strength tests and spectroscopic measurements. The basic skin parameters dependent on the arrangement of collagen fibres were determined. Then Raman spectra of the investigated tissue were recorded and bands characteristic of collagen protein were identified. An analysis of the results for the successive stages of skin stretching showed, among other things, differences in the location of the amid I band maximum (1658cm-1) depending on the direction of specimen stretching. A comparison of the characteristic ranges of change determined by the two methods showed that Raman spectroscopy can be used to ascertain the orientation of collagen fibres in the course of stretching, which information is essential for skin transplantation.

2

Textural properties of silica-based organic-inorganic polymer hybrid xerogels

Zaręba-Grodź I., Miśta W., Sikora A., Gotszalk T., Stręk W., Hermanowicz K., Maruszewski K.

Materials Science Poland

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2005

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Vol. 23, No. 1

147--158

EN

Samples of xerogels containing organic polymers were prepared by the sol-gel method via the reaction of tetraethoxysilane (TEOS) and organic monomers with an acidic catalyst. These materials were obtained as transparent and homogeneous bulk materials. The samples were characterized by Raman and IR spectroscopies, N2-adsorption (77 K), and atomic force microscopy (AFM). Specific surface areas and porosities of the samples were estimated from nitrogen adsorption-desorption isotherms at 77 K. Textural properties such as specific surface areas (SBET), pore volume (Vp), average pore sizes (Rp), and micropore volume (VDR) were obtained. The complete adsorption-desorption isotherms and pore size distributions were analysed following the Dollimore-Heal method. Atomic force microscopy was used to investigate the morphology and roughness of the samples.

3

Luminescence properties of Eu3+-doped Al2(WO4)3

Macalik L., Hanuza J., Hermanowicz K., Godlewska P., Sidorov N. V.

Materials Science Poland

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2004

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Vol. 22, No. 2

145--152

EN

Emission spectra of Al2(WO4)3 doped with Eu3+ were recorded at room temperature (orthorhombic phase) and at 10 K (monoclinic phase). The luminescence excitation spectra and luminescence decay profiles were recorded for both structural modifications at RT and LN2T, and the luminescence lifetimes of Eu3+ have been estimated. Two-site behaviour of the optically active ions in both phases has been revealed in the luminescence studies. However, the emission decay profiles give one lifetime of the 5D2 level, equal to 1.8 ms and 848.4 žs at room temperature and liquid nitrogen temperature, respectively. The results obtained have been explained in terms of an unusual location of Eu3+ ions inside the crystal tunnels, parallel to the c-axis.

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Wykorzystanie Internetu do badania stabilności źródeł promieniowania optycznego

Hermanowicz K.

Telekomunikacja i Techniki Informacyjne

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2002

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nr 3-4

79-84

PL

Opisano przykład wykorzystania rozproszonego systemu pomiarowego do pomiaru parametrów źródeł promieniowania optycznego. W systemie tym przyrządy pomiarowe są sterowane przez szynę GPIB i środowisko LabWindows. Konwerter GPIB-ENET służy do komunikacji komputera z rzeczywistym systemem pomiarowym. Podkreślono, że jest możliwa zdalna konfiguracja systemu, diagnozowanie aparatury oraz odbiór danych pomiarowych.

EN

The objective is to build automatic system for optical sources calibration. System consists of GPIB controlled instruments. GPIB-Ethernet converter provides remote access to the system. The use of Internet technology in measurements enables unlimited abilities for system developing and data acquisition

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The bismuth - doping effect on the Jahn-Teller phase transition in CsDy(MoO4)2 crystal

Gerashchenko S. S., Miloslavskaya O. V., Kharchenko Y. N., Kut'ko V. I., Nesterenko N. M., Macalik L., Hermanowicz K., Mączka M., Hanuza J.

Materials Science

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2002

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Vol. 20, No. 2

81-89

EN

Using spectroscopic and visual optical methods the shift of the critical temperature (Ttr~42K) of the first-order phase transition of the Jahn-Teller type to the lowtemperature side at doping the CsDy(MoO4)2 crystal with Bi3+ (concentration up to x~0.08) was revealed. Effect of the doping is compared to the effect of uniaxial pressure. Using the result of the Zeeman effect we have calculated the critical value Hc of external magnetic field at which the spontaneous change of the sizes of crystal is suppressed under magnetic field and the high-temperature phase may be induced at T=0°K. It is supposed that doping with Bi3+ leads to decrease of the critical magnetic field value for doped CsDy(MoO4)2 .