Search results

1

Site Percolation Thresholds of FCC Lattice

100%

Gawron T., Cieplak M.

Acta Physica Polonica A

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1991

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vol. 80

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issue 3

461-464

EN

Percolation thresholds, p_{c}, for site diluted spin systems on the fcc lattice are determined for exchange interactions extending up to the shell of the fourth nearest neighbors. If the interactions include the nearest, second, third, and fourth neighbors, p_{c} is equal to 0.198, 0.136, 0.061, and 0.05 respectively. These results agree with the Roberts approximate formula for p_{c}. Estimation of p_{c} to even longer-ranged couplings is presented. For instance for p_{c} = 0.01 the range of the couplings should extend at least to the eight shell of neighbors.

2

Rozciąganie molekuł białek — porównywanie ich własności mechanicznych

100%

Cieplak M., Sułkowska J. I.

Kosmos

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2006

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vol. 55

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issue 4

321-330

EN

Mechanical stretching of single proteins has been studied experimentally for about 55 proteins yielding a variety of force patterns and peak forces. Here, we perform a theoretical survey of proteins of known native structure and map out the landscape of possible dynamical behaviors under stretching at a constant speed. We consider 7510 proteins each comprising not more than 150 amino acids. The model used is constructed based on the native geometry. It is solved by methods of molecular dynamics and validated by comparing the theoretical predictions to experimental results. We characterize the distribution of peak forces and correlations with the system size and with the structure classification as characterized by the hierarchical classification of protein domain structures (CATH). Despite the presence of such correlations, proteins with the same CATH index may belong to different classes of the dynamical behavior. We identify proteins with the biggest forces and show that they belong to few topology classes. We determine which protein segments act as mechanical clamps and show that, in most cases, they correspond to long stretches of parallel β-strands, but other mechanisms are also possible.

3

Conductance Fluctuations in Microstructures of HgCdMnTe Bicrystals

52%

Grabecki G., Lenard A., Plesiewicz W., Jaroszyński J., Cieplak M., Skośkiewicz T., Dietl T., Kamińska E., Piotrowska A., Bulka B.

Acta Physica Polonica A

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1991

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vol. 80

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issue 2

307-310

EN

Microscopic four-contact probes to semimagnetic HgCdMnTe grain-boundary inversion layers have been photolithographically patterned. Magnetoresistance measurements performed on these samples revealed aperiodic conductance fluctuations of the magnitude of the order of e^{2}/h. Quantitative analysis of both fluctuation amplitude and their mean period indicate that we have approached the mesoscopic regime in our system. This opens new possibilities in studies of spin-subsystem dynamics in semimagnetic semiconductors.

4

Second Harmonic Generation in Spin-Glass Microstructures and Fabrication of Microstructures in IV-VI Epilayers

42%

Grabecki G., Dietl T., Cieplak M., Plesiewicz W., Lenard A., Skośkiewicz T., Kamińska E., Piotrowska A., Żarecka R., Springholz G., Bauer G.

Acta Physica Polonica A

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1993

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vol. 84

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issue 4

781-784

EN

We studied magnetoconductance of two different mesoscopic systems: microregions containing two-dimensional electron gas adjacent to a grain-boundary plane in bicrystals of Hg_{0.79}Cd_{0.19}Mn_{0.02}Te and photolithographically patterned microstructures of Pb_{1-x}Mn_{x}Se. In both systems universal conductance fluctuations and generation of the second-harmonic voltage were observed at T ≤ 1 K. Moreover, in the former system the second harmonic signal exhibited distinct rise when the sample was cooled below the spin-glass freezing temperature (100 mK).

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3 Acta Physica Polonica A

1 Kosmos

1 2006

1 1993

2 1991

4 Cieplak M.

2 Dietl T.

2 Grabecki G.

2 Kamińska E.

2 Lenard A.

2 Piotrowska A.

2 Plesiewicz W.

2 Skośkiewicz T.

1 Bauer G.

1 Bulka B.

1 Gawron T.

1 Jaroszyński J.

1 Springholz G.

1 Sułkowska J. I.

1 Żarecka R.

Site Percolation Thresholds of FCC Lattice

Rozciąganie molekuł białek — porównywanie ich własności mechanicznych

Conductance Fluctuations in Microstructures of HgCdMnTe Bicrystals

Second Harmonic Generation in Spin-Glass Microstructures and Fabrication of Microstructures in IV-VI Epilayers