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[en] This paper is devoted to the classical Knotting Problem: for a given manifold N and number m describe the set of isotopy classes of embeddings N→Sm. We study the specific case of knotted tori, that is, the embeddings Sp×Sq→Sm. The classification of knotted tori up to isotopy in the metastable dimension range m ≥ p + 3/2q + 2, p≤q, was given by Haefliger, Zeeman and A. Skopenkov. We consider the dimensions below the metastable range and give an explicit criterion for the finiteness of this set of isotopy classes in the 2-metastable dimension. Bibliography: 35 titles.
[en] We have measured the circular polarization of sunspots with a sensitivity of less than 3 x 10-6, over the range from 3700 A to 4.5 μm. Through all of our passbands of widths > or =0.1 μm, V has a single sign for a given spot, namely: if H is toward the observer, V is negative, i.e., the E vector rotates clockwise in a stationary plane over the spot. The rough magnitude, sign, and to some extent the spectral shape of V(lambda) for lambda> or =1.5 μm agree with a continuum magneto-opacity model. But the UV-visible polarization is anomalously large, e.g., > or approx. =0.05% in the B band, seemingly correlated with line blanketing. A new mechanism for this is proposed, magneto-emission by atoms oriented by anisotropic radiation
[en] A new high precision measurement of the muonium hyperfine structure interval Δν and its Zeeman effect in the n = 1 ground state is being undertaken at LAMPF. Aiming for a precision of 50 ppb for the muon to proton magnetic ratio μμ/μp and of 10 ppb for Δν, the present experimental uncertainties can be reduced by a factor of about 5 using line-narrowing techniques. It is emphasized that still more precise measurements would be possible in the future with the realization of a more intense pulsed muon source
[en] The history of invention and development of Zeeman laser gyroscopes, specific features of their optical scheme and operation principle are described. The construction and element base of modern laser angular velocity sensors with Zeeman-based frequency biasing are considered. The problems and prospects of their development are discussed. (laser gyroscopes)
[en] A method and apparatus are described for creating a plasma of ions of one isotope type and magnetically extracting the ions from the plasma without impairing the ionization selectivity and efficiency. In a particle flow of plural isotope types, radiant energy is applied to selectively excite and ionize ions of at least one isotope type without corresponding ionization of particles of other isotope types. A magnetic field is applied to divert the ions of the one isotope type sufficiently to permit separate collection of those ions without the other particle constituents of the flow. The system of the invention balances the requirements for a high magnetic field to provide sufficient diversion before charge exchange with the requirement for a limited magnetic field to prevent interference with the selective ionization process due to Zeeman broadening of the isotope absorption lines. 25 claims, 8 drawing figures