Wyniki wyszukiwania - Biblioteka Nauki

1

Influence of surface states and bulk traps on non-equilibrium phenomena at GaAs and GaN surfaces

100%

Miczek M. , Adamowicz B. , Hashizume T. , Hasegawa H.

Optica Applicata

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2005

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tom Vol. 35, nr 3

355-361

EN

The influence of surface state density Nss and bulk non-radiative lifetime t(tau) on room temperature photoluminescence quantum efficiency YPL and surface photovoltage (SPV) versus the excitation light intensity F(fi) was studied theoretically for GaAs and wurtzite GaN using self-consistent computer simulations. It was demonstrated that SPV(F) dependences are more sensitive than YPL (F) to a change in magnitude of Nss, especially for high Nss and at low F, whereas SPV is practically insensitive to t contrary to YPL. The simultaneous measurement of YPL and SPV versus , combined with rigorous computer analysis, seems to be a very promising method for contactless characterization of the surface and bulk trap parameters.

2

Design and evaluation of a gps-based navigation system for forestry workers

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Yoshimura T. , Tachiki Y. , Hasegawa H.

Zeszyty Naukowe Akademii Rolniczej w Krakowie. Sesja Naukowa

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2005

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tom 91

83-88

3

Characterization of electronic properties of InP(100) surfaces from computer-aided analysis of photoluminescence

100%

Miczek M. , Adamowicz B. , Hasegawa H.

Optica Applicata

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2002

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tom Vol. 32, nr 3

226-233

EN

The surface state density distributions NSS(E) on the InP surface were determined by employing a rigorous computer analysis of the dependences of the band-to-band photoluminescence efficiency YPL versus excitation light intensity F. Experimental YPL–F spectra, taken from the literature, were obtained for the n-InP (100) surface after chemical polishing and ion bombardment. Theoretical Y PL–F curves were calculated using a numerical simulator which takes into account all bulk and surface recombination processes. The NSS(E) distributions were determined for both surfaces from the best fit to experimental data by applying a procedure based on genetic algorithm. An increase in NSS(E) after ion bombardment was attributed to the surface disordering. The behaviour of the effective surface recombination velocity and quasi-Fermi levels for electrons and for holes versus F was also analysed.

4

Determination of the surface state density distribution and fermi level position on the InP (100) surface from excitation-power-dependent photoluminescence efficiency spectra

100%

Adamowicz B. , Miczek M. , Domagała T. , Hasegawa H.

Elektronika : konstrukcje, technologie, zastosowania

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2001

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tom Vol. 42, nr 8-9

76-78

EN

The energy distribution of the surface state density NSS(E) on the chemically polished n-type InP (100) surface was determined from a rigorous computer analysis of the band-to-band photoluminescence efficiency (ϒ PL) versus excitation light intensity (θ). We obtained a very good modelling of the experimental ϒ PL-θ spectrum, taken from the literature, which exhibited a strong increase of ϒ PL. The theoretical values of ϒ PL were calculated using a numerical simulator taking account of all possible recombination processes in a bulk and via surface states. Due to an optimised fitting realised by means of a novel fully-computer procedure based on Genetic Algorithm, we determined the U-shaped NSS(E) distribution as well as the values of surface state cross sections for capturing electrons (σn) and holes (σp). In addition, we analysed the behaviour of the quasi-Fermi levels (EFn, EFp) on the surface and profiles of the radiative recombination velocity (Urad) under increasing excitation intensity.

5

Onchocerca lupi infection in Turkey: A unique case of a rare human parasite

63%

Ilhan H. D. , Yaman A. , Morishima Y. , Sugiyama H. , Muto M. , Yamasaki H. , Hasegawa H. , Lebe B. , Bajin M. S.

Acta Parasitologica

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2013

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tom 58

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nr 3

EN

Onchocerpa lupi was first isolated from a wolf in Russia. Since then, canine ocular onchocercosis has been increasingly reported, particularly in Europe and the United States. It is thought that blackflies and midges are the vectors of transmission, and it is possible that these vectors could transmit the parasite to humans. The first human case of O. lupi in Turkey was reported in 2011. In this report we present the third human case of O. lupi infection in Turkey. Our patient was a 28-year-old male who displayed a painless, immobile mass under the conjunctiva. The mass measured 10 × 12 mm in size. Pathological examination of the surgically excised tissue was suggestive of infection by a filarial nematode. Subsequently, the parasite was identified as O. lupi through molecular analysis. All of the previously reported cases of O. lupi in both humans and dogs were more symptomatic than in our patient, Onchocerca infection should not be ruled out during the differential diagnosis of the subconjunctival and orbital cystic mass in instances where there is little to no inflammation. It is important to consider biopsy and carry out molecular analysis to identify the parasite.