Entity

Time filter

Source Type

Kotsyubyns’ke, Ukraine

Tkach N.V.,FedKovich Chernivtsy National University | Seti J.A.,FedKovich Chernivtsy National University
Semiconductors | Year: 2011

On the basis of a model of rectangular potentials and different electron effective masses in wells and barriers of an open resonant-tunneling structure with identical outer barriers, a theory has been developed and the dynamic conductance caused by the interaction of the electromagnetic field with electrons passing through the structure has been calculated. Using the example of the three-barrier resonant-tunneling structure with In0.53Ga0.47As wells and In0.52Al0.48As barriers, it is shown that, independently of the geometrical sizes of potential wells and barriers, there exist three geometrical configurations (positions of the inner barrier with respect to outer ones) at which the nanosystem, as an active element, provides optimum operating conditions of the quantum cascade detector. © 2011 Pleiades Publishing, Ltd.


Marchenko M.M.,FedKovich Chernivtsy National University | Kopyl'Chuk G.P.,FedKovich Chernivtsy National University | Ketsa O.V.,FedKovich Chernivtsy National University
Biomeditsinskaya Khimiya | Year: 2010

The activity of detoxication enzymes in liver microsomal fraction of preliminary radiation-exposed rats was investigated. It was shown that preliminary organism exposure to radiation reduced cytochrome P450 and glutathione-S-transferase activity in liver microsomal fraction in the latent and logarithmic phases of oncogenesis compared with the unirradiated rats with tumor. Low level of cytochrome P450 activity can be caused by transition of microsomal cytochrome P450 in P420 inactive form. The preliminary radiation does not influence the enzyme activity of liver cytochrome P450 and glutathione-S-transferase on terminal stages of Guerin's carcinoma growth.


Kurek E.I.,FedKovich Chernivtsy National University | Oleinich-Lysyuk A.V.,FedKovich Chernivtsy National University | Raranskii N.D.,FedKovich Chernivtsy National University
Technical Physics Letters | Year: 2011

We have studied the effect of a weak magnetic field (~10 -3-10 -2 T) on the elastic and inelastic characteristics of a diamagnetic beryllium condensate. It is established that the field effect is most pronounced in a magnetic aftereffect, which leads to inversion of the amplitude and temperature dependences of the effective shear modulus at an almost unchanged level of the elastic energy absorption. © 2011 Pleiades Publishing, Ltd.


Borcha M.D.,FedKovich Chernivtsy National University | Balovsyak S.V.,FedKovich Chernivtsy National University | Fodchuk I.M.,FedKovich Chernivtsy National University | Khomenko V.Y.,FedKovich Chernivtsy National University | Tkach V.N.,Ukrainian Academy of Sciences
Journal of Superhard Materials | Year: 2013

The histogram method has been proposed to determine strains in diamond crystals by the analysis of reflection electron diffraction bands in Kikuchi patterns. The anisotropy has been defined of the local strain distribution on the surface of two diamond samples produced by the temperature gradient method in the Fe-Al-C system and by growing on a surface of a statically synthesized diamond single crystal (Ni-Mn-C) in the Mg-C + Bor system. © 2013 Allerton Press, Inc.


Kleto G.I.,FedKovich Chernivtsy National University | Savchuk A.I.,FedKovich Chernivtsy National University | Tsalyi V.Z.,FedKovich Chernivtsy National University | Yur'ev V.G.,FedKovich Chernivtsy National University | Doktorovich I.V.,FedKovich Chernivtsy National University
Technical Physics Letters | Year: 2014

The main photoelectric parameters of n-TiO2/p-Co0.7Ni0.3O film heterostructures obtained by sequential sputtering of corresponding metal targets in oxidizing atmosphere have been determined. The heterostructures are photosensitive in a wavelength range of 225-385 nm and exhibit no photoresponse in the visible spectral range. The proposed structures can be used for creating photodetectors with high spectral selectivity. © 2014 Pleiades Publishing, Ltd.

Discover hidden collaborations