In the framework of the spin-fermion model, it is shown that accounting for the strong spin-charge fluctuations between holes of copper and oxygen ions in cuprate High-T
c
superconductors leads to ...the formation of the Fermi spin-polaron quasiparticles. It is demonstrated that the large value of the binding energy of such quasiparticle is determined by the processes in which hopping intensity of the oxygen holes depends significantly on the spin configuration of holes on the copper and oxygen ions. It was found that the ensemble of such quasiparticles manifests Cooper instability and the concentration dependence of the critical temperature is in good agreement with the experimental data.
The International Manifesto Group launched its manifesto, "Through Pluripolarity to Socialism" on 5 September 2021. Then, the world's attention was riveted to the US's ignominious exit from ...Afghanistan. The following speeches, delivered at the webinar to mark the first anniversary of the event, reflect on the tumultuous events of the year since, dominated by the US-led war on Russia, using Ukraine as a proxy, its wider international reverberations which have underlined as well as accelerated the US's decline and declining international influence and by the very real prospect that a similar US-led war is being planned against China using Taiwan region as a proxy. The speeches below find that, though the Manifesto's text was finalised before anyone could have imagined such wars, its general line pointing to the decline of capitalism and imperialism and the imperative for humanity to progress through pluripolarity-a world of variety of national economic formations that will inevitably result as efforts to build productive and egalitarian societies are undertaken-to socialism as capitalism's ability to deliver anything remotely similar is manifestly exhausted, has been vindicated.
For the frustrated two-dimensional
S
=
1
/
2
antiferromagnetic Heisenberg model close to quantum phase transition we consider the singlet ground states retaining both translational and SU(2) ...symmetry. Besides usually discussed checkerboard, spin-liquid and stripe states an unconventional state with two coexisting long-range orders appears to be possible at sufficiently large damping of spin excitations. The problem is treated in the frames of self-consistent spherically symmetric approach.
The paper presents a method developed for building a complete class of bent sequences of length
N
= 9 in the Vilenkin–Chrestenson basis based on employing three reference constructions. The first ...construction allows the bent sequences of arbitrary length
N
=3
2
k
,
k
∈ ℕ to be built. The resultant bent sequences can be used both in cryptographic applications and as constant amplitude codes in the MC-CDMA technology. A design of the gamma xoring block of graphic and video information based on bent sequences in the Vilenkin–Chrestenson basis was also proposed.
Method of polymerization inhibition by radioactive carbon monoxide (14CO) has been used to determine the number of active centers (CP) and propagation rate constant (kP) for ethylene polymerization ...with homogeneous complex 2,6‐(2,6‐(Me)2C6H3NCMe)2C5H3NFeCl2 (LFeCl2), activated with methylalumoxane (MAO) or Al(i‐Bu)3. With both activators the rate profile of polymerization was unstable: high activity 0.8 × 103–1.5 × 103 kg PE per (molFe · h · atm) at 35 °C of the initial period sharply decreases (sevenfold in 10 min). In the beginning of polymerization with the catalysts LFeCl2/MAO and LFeCl2/Al(i‐Bu)3, the CP values were found to be 8 and 41% of total Fe‐complex content in catalysts, respectively, and decreased 1.5–2‐fold in 9 min. As polymerization proceeds, the kP value for LFeCl2/MAO system decreases from 5 × 104 to 1.5 × 104 L · (mol · s)−1 LFeCl2/MAO, and for LFeCl2/Al(i‐Bu)3 system from 2.6 × 104 to 0.82 × 104 L · (mol · s)−1. Data on the effect of polymerization time on polyethylene molar mass distribution are presented. Basing on the obtained results it was suggested that highly reactive, but unstable centers, dominating at short polymerization times, produce low‐molar‐mass polyethylene, while polyethylene with higher molar mass is produced by less active (low kP) and more stable centers.
Data showing change in molar mass distribution of polyethylene with polymerization time.
Schwann cells forming peri-insular glial sheath of the pancreatic islets in some mammals can be involved in the pathogenesis of diabetes mellitus. Human pancreatic cells contain small elongated or ...oval cells of unknown origin with S100-immunopositive processes. We found that cells with processes located in pancreatic islets of human fetuses and children are similar to Schwann cells by their morphological and ultrastructural characteristics, immunopositive reaction for S100, and integration with nerve endings. In the pancreas of fetuses and children, Schwann cells are often seen in forming pancreatic islets and around the pancreatic ducts. The data suggests that Schwann cells can participate in the morphogenesis of human pancreatic islets.
A horilka (a Ukrainian vodka), containing ethyl alcohol, drinking water softened and sugar, is proposed. The drink is free of the sharp bitterness peculiar to drinks which strength exceeds 40 % by ...volume. The best scores of a degustation evaluation thereof carried out by the Central Degustation Committee of Ukraine are 9.2 and 9.5
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