Wyniki wyszukiwania - BazTech

1

Review. High pressure techniques used in the paramagnetic resonances

Krupska A., Krupski M.

Bulletin of the Polish Academy of Sciences. Technical Sciences

|

2016

|

Vol. 64, nr 1

135--141

EN

The aim of this review-paper is to overview high pressure techniques used in the magnetic resonances in laboratories. In this review, we would like to show the techniques that lead yielding high pressure applicable in the paramagnetic resonances. We would like to draw your attention to the separation of the effects resulting from the pressure and effects from the temperature, thereby separate the volume phonon contribution. Our main intention is to show the impact of high pressure on the structure of matter, in particular on its fundamental level.

2

High pressure impact on changes in potato starch granules

Słomińska L., Zielonka R., Jarosławski L., Krupska A., Szlaferek A., Kowalski W., Tomaszewska-Gras J., Nowicki M.

Polish Journal of Chemical Technology

|

2015

|

Vol. 17, nr 4

65--73

EN

Air dry potato starch (84.9% d.s.) was subjected to pressurizing under the pressure of 50, 100, 250, 500, 750, 1000 and 2000 MPa for 1 h. The physical properties of pressurized starch, such as morphology, surface and crystalline structure, gelatinization parameters, were studied by means of scanning and atomic force microscopy (SEM/AFM), X-ray diffraction (X-ray), differential scanning calorimetry (DSC). The susceptibility to the amylolytic enzyme (α-amylase) was also measured. Application of pressure in the range of 50–2000 MPa results in an increase in the compressed potato starch bulk density, change in the contours of the granules from oval to polyhedral, increase in the roughness of the granule surface, vanishing of the X-ray reflexes generated by the orthogonal structure and weakening of the reflexes generated by the hexagonal structure, lowering of the enthalpy of starch gelatinization, and the enhancement of hydrolytic susceptibility of starch granules to the amylolytic enzyme.

3

Suszenie osadów w instalacjach o niskim zużyciu energii

Krupska A.

Ekotechnika

|

2004

|

nr 3

23-23

4

The study of the spin transition process in Na[Fe(Th-Sa)2] by electron paramagnetic resonance

Yablokov Y. V., Zelentsov V. V., Augustyniak-Jabłokow M., Krupska A., Mroziński J.

Materials Science

|

2003

|

Vol. 21, No. 2

215-223

EN

The crossover phenomenon in Na[Fe(Th-Sa)2], a representative of a large class of the Fe(III) thiosemi-carbazonates, was examined by X-band EPR in temperatures 80 - 300°K and magnetisation of a polycrystalline sample was collected in the temperature range 1.8 - 300 K. The main results are as follows:- The appearance of LS complexes is requires thermal population of the 2A term but the transition process is ruled by other factors.- The LS complexes formed are not statistically distributed among the HS ones but tend to assemble in restricted spaces of the crystal lattice (domains) in which both short-range and long-range interactions of the complexes occur. - The increase in the cooperative interactions between the LS complexes and the enlargement of domains occur gradually with two jump changes. Each of the jumps has different character; the first is related to a redistribution of the complexes in domains and the other to a rapid increase in the LS phase volume.

5

Examination on the materials' porosity with the aid of SEM

Krupska A., Rożniakowski K., Wojtatowicz T. W.

Scientific Bulletin. Physics / Lodz University of Technology

|

2000

|

Vol. 20

25-38

EN

The porosity is one of the parameters of the three-dimensional structure of certain materials, also of the biological origin. The work briefly presents different methods of porosity evaluation, especially the so called point method and connected with the application of the Scanning Electron Microscope (SEM). The results obtained for several samples of hydrated calcium sulphate (natural gypsum) agree with the results of other methods.

PL

Jednym z parametrów struktury przestrzennej różnych materiałów, również niektórych biologicznych, jest porowatość. W pracy krótko przedstawiono różne metody jej wyznaczania, przede wszystkim metodę punktową, z wykorzystaniem skaningowego mikroskopu elektronowego. Otrzymane rezultaty badań dla szeregu próbek uwodnionego siarczanu wapnia (gipsu naturalnego) są zgodne z wynikami z innych metod.