829 research outputs found
Re-entrant resonant tunneling
We study the effect of electron-electron interactions on the
resonant-tunneling spectroscopy of the localized states in a barrier. Using a
simple model of three localized states, we show that, due to the Coulomb
interactions, a single state can give rise to two resonant peaks in the
conductance as a function of gate voltage, G(Vg). We also demonstrate that an
additional higher-order resonance with Vg-position in between these two peaks
becomes possibile when interactions are taken into account. The corresponding
resonant-tunneling process involves two-electron transitions. We have observed
both these effects in GaAs transistor microstructures by studying the time
evolution of three adjacent G(Vg) peaks caused by fluctuating occupation of an
isolated impurity (modulator). The heights of the two stronger peaks exibit
in-phase fluctuations. The phase of fluctuations of the smaller middle peak is
opposite. The two stronger peaks have their origin in the same localized state,
and the third one corresponds to a co-tunneling process.Comment: 9 pages, REVTeX, 4 figure
Identification, cDNA cloning, expression, crystallization and preliminary X-ray analysis of an exceptionally halotolerant carbonic anhydrase from Dunaliella salina
Hole-hole interaction in a strained InGaAs two dimensional system
The interaction correction to the conductivity of 2D hole gas in strained
GaAs/InGaAs/GaAs quantum well structures was studied. It is shown
that the Zeeman splitting, spin relaxation and ballistic contribution should be
taking into account for reliable determination of the Fermi-liquid constant
. The proper consideration of these effects allows us to describe
both th temperature and magnetic field dependences of the conductivity and find
the value of .Comment: 7 pages, 6 figure
Enhanced fluctuations of the tunneling density of states near bottoms of Landau bands measured by a local spectrometer
We have found that the local density of states fluctuations (LDOSF) in a
disordered metal, detected using an impurity in the barrier as a spectrometer,
undergo enhanced (with respect to SdH and dHvA effects) oscillations in strong
magnetic fields, omega _c\tau > 1. We attribute this to the dominant role of
the states near bottoms of Landau bands which give the major contribution to
the LDOSF and are most strongly affected by disorder. We also demonstrate that
in intermediate fields the LDOSF increase with B in accordance with the results
obtained in the diffusion approximation.Comment: 4 pages, 4 figure
ΠΠ»ΠΈΡΠ½ΠΈΠ΅ ΡΠ΅Ρ Π½ΠΎΠ»ΠΎΠ³ΠΈΡΠ΅ΡΠΊΠΈΡ ΡΠ΅ΠΆΠΈΠΌΠΎΠ² ΠΏΠ΅ΡΠ°ΡΠΈ Π½Π° Π·Π°ΠΊΡΠ΅ΠΏΠ»Π΅Π½ΠΈΠ΅ ΠΊΡΠ°ΡΠΊΠΈ Π½Π° ΠΏΠ»Π°ΡΡΠΈΠΊΠΎΠ²ΡΡ ΠΊΠ°ΡΡΠΎΡΠΊΠ°Ρ
ΠΠ° ΠΏΡΠ΄ΡΡΠ°Π²Ρ Π΅ΠΊΡΠΏΠ΅ΡΠΈΠΌΠ΅Π½ΡΠ°Π»ΡΠ½ΠΈΡ
Π΄ΠΎΡΠ»ΡΠ΄ΠΆΠ΅Π½Ρ Π²ΠΈΠ·Π½Π°ΡΠ΅Π½ΠΎ ΡΠΌΠΎΠ²ΠΈ Π·Π°ΠΊΡΡΠΏΠ»Π΅Π½Π½Ρ ΡΠ°ΡΠ±ΠΈ Π½Π° ΠΠΠ₯-ΠΏΠ»Π°ΡΡΠΈΠΊΡ.The terms of ink-fixing on the vinyl chloride polymer plastics are determined on the basis of experimental researches.ΠΠ° ΠΎΡΠ½ΠΎΠ²Π°Π½ΠΈΠΈ ΡΠΊΡΠΏΠ΅ΡΠΈΠΌΠ΅Π½ΡΠ°Π»ΡΠ½ΡΡ
ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΠΉ ΠΎΠΏΡΠ΅Π΄Π΅Π»Π΅Π½Ρ ΡΡΠ»ΠΎΠ²ΠΈΡ Π·Π°ΠΊΡΠ΅ΠΏΠ»Π΅Π½ΠΈΡ ΠΊΡΠ°ΡΠΊΠΈ Π½Π° ΠΠΠ₯-ΠΏΠ»Π°ΡΡΠΈΠΊΠ΅
Hard-core Radius of Nucleons within the Induced Surface Tension Approach
In this work we discuss a novel approach to model the hadronic and nuclear
matter equations of state using the induced surface tension concept. Since the
obtained equations of state, classical and quantum, are among the most
successful ones in describing the properties of low density phases of strongly
interacting matter, they set strong restrictions on the possible value of the
hard-core radius of nucleons. Therefore, we perform a detailed analysis of its
value which follows from hadronic and nuclear matter properties and find the
most trustworthy range of its values: the hard-core radius of nucleons is
0.30--0.36 fm. A comparison with the phenomenology of neutron stars implies
that the hard-core radius of nucleons has to be temperature and density
dependent.Comment: 12 pages, 4 figures, references added, typos correcte
ΠΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΠ΅ ΡΠ²ΠΎΠΉΡΡΠ² ΠΏΠ΅ΡΠ°ΡΠ½ΡΡ ΠΊΡΠ°ΡΠΎΠΊ
ΠΠΎΡΠ»ΡΠ΄ΠΆΠ΅Π½ΠΎ ΡΠ΅ΠΎΠ»ΠΎΠ³ΡΡΠ½Ρ ΡΠ° ΡΡΠ·ΠΈΠΊΠΎ-ΡΠ΅Ρ
Π½ΡΡΠ½Ρ Π²Π»Π°ΡΡΠΈΠ²ΠΎΡΡΡ ΡΠ°ΡΠ±, ΡΡ
ΠΎΠΏΡΠΈΡΠ½Ρ Ρ
Π°ΡΠ°ΠΊΡΠ΅ΡΠΈΡΡΠΈΠΊΠΈ.The rheological and physic-technical properties of inks and they optical characteristics are investigated.ΠΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΎ ΡΠ΅ΠΎΠ»ΠΎΠ³ΠΈΡΠ΅ΡΠΊΠΈΠ΅ ΠΈ ΡΠΈΠ·ΠΈΠΊΠΎ-ΡΠ΅Ρ
Π½ΠΈΡΠ΅ΡΠΊΠΈΠ΅ ΡΠ²ΠΎΠΉΡΡΠ²Π° ΠΊΡΠ°ΡΠΎΠΊ, ΠΈΡ
ΠΎΠΏΡΠΈΡΠ΅ΡΠΊΠΈΠ΅ Ρ
Π°ΡΠ°ΠΊΡΠ΅ΡΠΈΡΡΠΈΠΊΠΈ
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