428 research outputs found
Probe-Configuration-Dependent Decoherence in an Aharonov-Bohm Ring
We have measured transport through mesoscopic Aharonov-Bohm (AB) rings with
two different four-terminal configurations. While the amplitude and the phase
of the AB oscillations are well explained within the framework of the
Landaur-B\"uttiker formalism, it is found that the probe configuration strongly
affects the coherence time of the electrons, i.e., the decoherence is much
reduced in the configuration of so-called nonlocal resistance. This result
should provide an important clue in clarifying the mechanism of quantum
decoherence in solids.Comment: 4 pages, 4 figures, RevTe
Liquid crystal anchoring transitions on aligning substrates processed by plasma beam
We observe a sequence of the anchoring transitions in nematic liquid crystals
(NLC) sandwiched between the hydrophobic polyimide substrates treated with the
plasma beam. There is a pronounced continuous transition from homeotropic to
low tilted (nearly planar) alignment with the easy axis parallel to the
incidence plane of the plasma beam (the zenithal transition) that takes place
as the exposure dose increases. In NLC with positive dielectric anisotropy, a
further increase in the exposure dose results in in-plane reorientation of the
easy axis by 90 degrees (the azimuthal transition). This transition occurs
through the two-fold degenerated alignment characteristic for the second order
anchoring transitions. In contrast to critical behavior of anchoring, the
contact angle of NLC and water on the treated substrates monotonically declines
with the exposure dose. It follows that the surface concentration of
hydrophobic chains decreases continuously. The anchoring transitions under
consideration are qualitatively interpreted by using a simple phenomenological
model of competing easy axes which is studied by analyzing anchoring diagrams
of the generalized polar and non-polar anchoring models.Comment: revtex4, 18 pages, 10 figure
The value changes redox system the body fluid media for life processes and the action of drugs
The article presents information on the study of the possible effect of ionized liquids with different values of redox potential on the physiological processes and the action of drugs. To establish the possibility of changing the redox potential of body fluids in comparison with the arising physiological reactions and the action of drug
Search of new pharmaceuticals on the basis of darbepoetin in the treatment of ischemic stroke: review of literature
The article contains the analysis of medical and biological publications from the global database created by the National Centre for Biology Information (NCBI), an intramural biotechnological division of the US National Library of Medicine. The authors have analyzed publications of the recent ten years. Major results of study of erythropoietins and their recombinant analogues have been generalized and systematized. There has been revealed the significant potential of the preparations of this group to be studied and used. Major advantages and drawbacks of erythropoietins and their recombinant analogues have been describe
Effect of long-range Coulomb interaction on shot-noise suppression in ballistic transport
We present a microscopic analysis of shot-noise suppression due to long-range
Coulomb interaction in semiconductor devices under ballistic transport
conditions. An ensemble Monte Carlo simulator self-consistently coupled with a
Poisson solver is used for the calculations. A wide range of injection-rate
densities leading to different degrees of suppression is investigated. A sharp
tendency of noise suppression at increasing injection densities is found to
scale with a dimensionless Debye length related to the importance of
space-charge effects in the structure.Comment: RevTex, 4 pages, 4 figures, minor correction
Electron shot noise beyond the second moment
The form of electron counting statistics of the tunneling current noise in a
generic many-body interacting electron system is obtained. The third correlator
of current fluctuations (the skewness of the charge counting distribution) has
a universal relation with the current I and the quasiparticle charge q. This
relation C_3 = q^2 I holds in a wide bias voltage range, both at large and
small eV/kT, thereby representing an advantage compared to the Schottky
formula. We consider the possibility of using the counting statistics for
detecting quasiparticle charge at high temperature.Comment: 4 pages, 2 figure
Tensor analyzing power Ayy in deuteron inclusive breakup at large Pt and spin structure of deuteron at short internucleonic distances
The Ayy data for deuteron inclusive breakup off hydrogen and carbon at a
deuteron momentum of 9.0 GeV/c and large Pt of emitted protons are presented.
The large values of Ayy independent of the target mass reflect the sensitivity
of the data to the deuteron spin structure. The data obtained at fixed and
plotted versus Pt clearly demonstrate the dependence of the deuteron spin
structure at short internucleonic distances on two variables. The data are
compared with the calculations using Paris, CD-Bonn and Karmanov's deuteron
wave functions.Comment: 4 pages, 2 figures, talk given at the SPIN2004 Conf., 10-16 Oct.
2004, Triest, Ital
- …