8,009 research outputs found
Meeting with the Hebrew author Elias Hurwitz
No full textWhite paper; handpainted; on the reverse of Luftwaffe uniform pattern. Digitized posters are related to the activities of Jewish displaced persons drawn from the Records of Displaced Persons Camps and Centers in Germany (RG 294.2) Italy (RG 294.3) and Austria (RG 294.4) held by YIVO Archives. Please consult the historical note for those record groups for further information.Digital ImageDigital finding aid available
Spectroscopy of M+? Rg and transport coefficients of M+ in Rg (M = Rb-Fr; Rg = He-Rn)
No full textHigh-level, CCSD(T), ab initio calculations are employed to determine accurate potential energy curves for the Rb+ . Rg, Cs+ . Rg and Fr+ . Rg species (where Rg = He-Rn). Large flexible valence basis sets are combined with effective core potentials (ECPs). The potential energy curves are used to obtain spectroscopic constants and, in addition, to calculate transport coefficients for Rb+, Cs+ and Fr+ moving in the respective rare gas. These transport coefficients are then statistically compared to previous data. It is concluded that the potentials are reliable. Some disagreement is found with some of the Cs+ transport data, which is attributed to non-equilibration in the experiments performed for heavy-M+/light Rg combinations. A distinct advantage of the present potentials is that they are totally ab initio, and consequently do not require experimental data to which to be fitted, as do many of the various forms of model potential available
Obituary announcement about author and labor activist Sh. Mendelson
No full textBrown paper; handpainted. Digitized posters are related to the activities of Jewish displaced persons drawn from the Records of Displaced Persons Camps and Centers in Germany (RG 294.2) Italy (RG 294.3) and Austria (RG 294.4) held by YIVO Archives. Please consult the historical note for those record groups for further information.Digital ImageDigital finding aid available
Spectroscopy of Na<sup>+</sup>·Rg and transport coefficients of Na<sup>+</sup> in Rg (Rg=He-Rn)
Full text linkHigh-level ab initio calculations are used to obtain accurate potential energy curves for Na+·Kr, Na+·Xe, and Na+·Rn. These data are used to calculate spectroscopic parameters for these three species, and the data for the whole Na+·Rg series (Rg=He-Rn) are compared. Potentials for the whole series are then used to calculate both mobilities and diffusion coefficients for Na+ moving through a bath of each of the six rare gases, under conditions that match previous experimental determinations. Different available potentials and experimental data are then statistically compared. It is concluded that the present potentials are very accurate. The potential and other data for Na+·Rn appear to be the first such reported
Interaction potentials and spectroscopy of Hg+•Rg and Cd+•Rg and transport coefficients for Hg+ and Cd+ in Rg (Rg=He-Rn)
Full text linkHigh-level ab initio calculations have been performed on the Hg(+)•Rg and Cd(+)•Rg species, where Rg=He-Rn. Potential-energy curves have been calculated over a wide range of internuclear separation, sampling the repulsive, equilibrium, and long-range regions. From these curves, rovibrational and spectroscopic constants were derived and compared to those available from previous studies. In addition, transport coefficients were calculated and compared to the available experimental data for the cases of Hg+ in He, Ne, and Ar. There are two interesting features relating to the mobility results. One is the development of a "mobility minimum" for Hg+ in the heavier rare gases-with weaker minima being found for Cd+; a "rule of thumb" is presented for determining when mobility minima might appear. The second is that excellent agreement is found for the direct calculation of mobilities for Hg+ in Ne-22, and those obtained by scaling the Ne-20 mobilities. The latter result allows us to conclude that the mobilities of the various combinations of isotopes can be calculated from the results herein via a mass scaling
Accurate potential energy curves for Zn+-Rg (Rg = He-Rn): Spectroscopy and transport coefficients
No full textHigh-quality ab initio potential energy curves are presented for the Zn+–Rg series (Rg = He–Rn). Calculations are performed at the RCCSD(T) level of theory, employing aug-cc-pV5Z quality basis sets, with ‘small core’ relativistic effective core potentials being used for Kr–Rn. We present spectroscopic information for the titular species, derived from our potential energy curves, and compare to previous results. We also present calculated ion transport data and show that mobility minima occur for a number of these systems, albeit at low gas temperatures for some of them
A Novel QRS Detection Algorithm Applied to the Analysis for Heart Rate Variability of Patients with Sleep Apnea
No full textSweeping has no effect on renormalized turbulent viscosity
No full textWe perform renormalization group analysis (RG) of the Navier-Stokes equation in the presence of constant mean velocity field , and show that the renormalized viscosity is unaffected by , thus negating the ``sweeping effect", proposed by Kraichnan [Phys. Fluids {\bf 7}, 1723 (1964)] using random Galilean invariance. Using direct numerical simulation, we show that the correlation functions for and differ from each other, but the renormalized viscosity for the two cases are the same. Our numerical results are consistent with the RG calculations
RG boundaries and interfaces in Ising field theory
No full textPerturbing a CFT by a relevant operator on a half space and letting the perturbation flow to the far infrared we obtain an RG interface between the UV and IR CFTs. If the IR CFT is trivial we obtain an RG boundary condition. The space of massive perturbations thus breaks up into regions labelled by conformal boundary conditions of the UV fixed point. For the 2D critical Ising model perturbed by a generic relevant operator we find the assignment of RG boundary conditions to all flows. We use some analytic results but mostly rely on TCSA and TFFSA numerical techniques. We investigate real as well as imaginary values of the magnetic field and, in particular, the RG trajectory that ends at the Yang-Lee CFT. We argue that the RG interface in the latter case does not approach a single conformal interface but rather exhibits oscillatory non-convergent behaviour
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