49 research outputs found
AC Josephson properties of phase slip lines in wide tin films
Current steps in the current-voltage characteristics of wide superconducting
Sn films exposed to a microwave irradiation were observed in the resistive
state with phase slip lines. The behaviour of the magnitude of the steps on the
applied irradiation power was found to be similar to that for the current steps
in narrow superconducting channels with phase slip centers and, to some extent,
for the Shapiro steps in Josephson junctions. This provides evidence for the
Josephson properties of the phase slip lines in wide superconducting films and
supports the assumption about similarity between the processes of phase slip in
wide and narrow films.Comment: 7 pages, 2 figures, to be published in Supercond. Sci. Techno
Low-temperature heat capacity of fullerite C₆₀ doped with nitrogen
The heat capacity Cm of polycrystalline fullerite C₆₀ doped with nitrogen has been measured in
the temperature interval 2–13 K. The contributions to the heat capacity from translational lattice
vibrations (Debye contribution), orientational vibrations of the C₆₀ molecules (Einstein contribution),
and from the motion of the N₂ molecules in the octahedral cavities of the C₆₀ lattice have
been estimated. However, we could not find (beyond the experimental error limits) any indications
of the first-order phase transformation that had been detected earlier in the dilatometric investigation
of the orientational N₂–C₆₀ glass. A possible explanation of this fact is proposed
Optically Pumped Polarized He Ion Source Development for RHIC/EIC
The proposed polarized He acceleration in RHIC and the future
Electron-Ion Collider will require about ions in the source
pulse. A new technique had been proposed for production of high intensity
polarized He ion beams. It is based on ionization and accumulation
of the He gas (polarized by metastability-exchange optical pumping and in
the 5 T high magnetic field) in the existing Electron Beam Ion Source (EBIS). A
novel He cryogenic purification and storage technique was developed to
provide the required gas purity. An original gas refill and polarized He
gas injection to the EBIS long drift tubes, (which serves as the storage cell)
were developed to ensure polarization preservation. An infrared laser system
for optical pumping and polarization measurements in the high 3--5 T field has
been developed. The He polarization 80--85\% (and sufficiently long
min relaxation time) was obtained in the \lq\lq{open}\rq\rq\ cell
configuration with refilling valve tube inlet and isolation valve closed. The
development of the spin-rotator and He He absolute nuclear polarimeter
at 6 MeV He beam energy is also presented.Comment: 9 pages, 11 figure
Low temperature heat capacity of fullerite C60 doped with nitrogen
The heat capacity Cm of polycrystalline fullerite C60 doped with nitrogen has
been measured in the temperature interval 2 - 13 K. The contributions to heat
capacity from translational lattice vibrations (Debye contribution),
orientational vibrations of the C60 molecules (Einstein contribution) and from
the motion of the N2 molecules in the octahedral cavities of the C60 lattice
have been estimated. However, we could not find (beyond the experimental error
limits) any indications of the first - order phase transformation that had been
detected earlier in the dilatometric investigation of the orientational N2-C60
glass. A possible explanation of this fact is proposed.Comment: 4 pages, 2 figures, to be published in Fiz. Nizk. Temp. (Low Temp.
Phys.
Prices are an Important Tool for Creating a Communist Economy
The 22nd Congress of the CPSU has defined the principal economic goal of Soviet society - to create the material and technical basis of communism in the course of the next two decades. To achieve this goal it is essential to take full advantage of commodity-money relations in their socialist essence and to perfect such tools of economic development as value and price.
The Development of Price Formation in the USSR
The Soviet state has, since the October Revolution, traversed a complex road of economic development. Basing itself upon objective laws, it has made use, in its work, of a number of old methods and forms inherited from capitalism, such as trade, a government budget, taxes, and also of such major economic categories as price and pricing. "Here, as in all its historical creations, the proletariat takes its weapons from capitalism; it does not âinvent,â does not âcreate out of nothing.â"
Development of the Wholesale Price System in Industry
The Program of the CPSU points to the need for making fuller use of commodity-money relations in the building of communism. In this, such instruments of economic development as price, profitability, cost accounting, and others can play a big part.
Phase-Slip Processes in Superconducting Films: AC Josephson Effect and New Phase Transition
The resistive direct current state in wide thin superconducting films as the phase transition from superconducting to normal state is investigated in the absence of external magnetic field. We showed that the states of a wide film with increasing transport current appear in the following order: the superconducting state; the resistive vortex state; the critical state; the new vortex-free resistive state with phase-slip lines; the normal state. We detected the Shapiro current steps on the current-voltage characteristic of the wide film, which arise due to interaction of intrinsic Josephson radiation of phase-slip lines with external microwave irradiation