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100%

Panek M.

Studia Ecologiae et Bioethicae

2004

tom 2

nr 1

629-646

The concept of „supposition" has already been brought in by the scholastics (suppositio) for describing different relations between objects and names, which refer to these objects. In the XX century, the problem of supposition, understood som ew hat different than by the scholastics, was taken up by A. Meinong. His intention was taking notice of judgment existence, which does not express even the involvement of belief. Such a concept of supposition has been taken up and developed by many Polish philosophers (inter alia W. Witwicki, T. Czeżowski, K. Pasenkiewicz, K. Ajdukiewicz, H. Mehlberg, B. Gawęcki, and L. Kołakowski). They emphasized both subjective aspect - lack of belief moment, and objective aspect - non-verifiability.

Simulations of AlGaAs/GaAs heterojunction phototransistors

51%

Ściana B. , Panek M. , Borczuch A. , Tłaczała M.

Open Physics

2011

tom 9

nr 4

1114-1121

Heterojunction bipolar phototransistors, based on GaAs technology, are widely used in optoelectronic integrated circuits. One of the methods to improve phototransistor performance is applying a delta-doped thin base, which causes both a higher current gain and a better time response. There is a lack of information about this kind of device in the literature. Our work presents the results of computer simulations of AlGaAs/GaAs n-p-n phototransistors, with a bulk-doped and delta-doped base working as two- and threeterminal devices. The characteristics and device parameters obtained clearly show that phototransistors with delta-doped base have higher sensitivity and a better time response compared to the structures with a bulk-doped base. Based on simulation results, we modified the epitaxial phototransistor structure with a double delta-doped base that should improve device performance.