[en] We propose a model for explaining the results of the Hall effect measurements of high-T_c cuprates in the normal state, in various materials. They all show common features: a decrease of the Hall coefficient R_H with temperature and a universal law, when plotting R_H(T)/R_H(T₀) versus T/T₀ where T₀ is defined from experimental results. This behaviour is explained by using the well known electronic band structure of a CuO₂ plane, showing saddles points at the energies E_S in the directions [0,±π] and [±π,0]. This is well confirmed by photoemission experiments. We remark that for the energies E>E_S the carrier orbits are hole-like and for E< E_S they are electron-like, giving opposite contributions to R_H. We are able to fit all experimental results for all doping, and to fit the universal curve. For us k_BT₀ is simply E_F-E_S, where E_F is the Fermi level varying with the doping

[en] The existence of van Hove singularities close to the Fermi level in all high Tc cuprates has been experimentally established. The authors develop a theory using these singularities which enables one to compute the main physical properties: Tc, gap and gap anisotropy, specific heat and magnetic susceptibility. All these results agree well with the experimental data in the optimal and overdoped regime. In the underdoped regime, they use the theory of electron-electron interaction in disordered conductors to explain the pseudo-gap behavior

[en] We propose a model for explaining the dependence in temperature of the Hall effect of high T_c cuprates in the normal state, in various materials (LSCO, YBCO, BSCCO, GdBCO). They all show common features: a decrease of the Hall coefficient R_H with temperature and a universal law, when plotting R_H(T)/R_H(T₀) versus T/T₀ where T₀ is defined from experimental results. This behaviour is explained by using the well known electronic band structure of a CuO₂ plane, showing saddle points at the energies E_S in the directions [0,±π] and [±π,0]. This is well confirmed by photoemission experiments. We remark that in a magnetic field, for energies E>E_S the carrier orbits are hole-like and for E< E_S they are electron-like, giving opposite contributions to R_H. We are able to fit all experimental results for a wide range of hole doping (p_h0) (0.09< p_h0<0.30), and to fit the universal curve. For us k_BT₀ is simply E_F-E_S, where E_F is the Fermi level varying with the doping

[en] The authors compute the superconducting gap Δ_rveck using a simple band structure of the CuO₂ planes in the high Tc materials. They suppose that for materials with doping corresponding to maximum T_c, the van Hove singularities lie close to the Fermi level as is confirmed by many photoemission experiments. They use a electron-photon interaction with weak screening, they find a strong gap anisotropy. For Bi 2212, Δ is maximum along the 100 and 010 directions with values between 20 and 30 meV and minimum along 110 with values between 0 and 10 meV. They use this anisotropic gap to compute the quasi-particle excitations density of states and the tunneling current-voltage I(V) characteristic for N-I-S and S-I-S junctions. This model agrees remarkably well with recent experiments of tunneling spectroscopy in high T_c cuprates

No abstract available

[en] This paper presents a discussion on the therapeutic effect of I-131 MIBG on bone marrow invasion. The discussion includes the problem of dosage and diagnostic applications

[en] Vibration-rotation interaction coefficients Fsub(vJ) were calculated for the e ³PIsub(g)- a ³Σsub(u)⁺ and E ¹PIsub(g)-A ¹Σsub(u)⁺ transitions of He₂ on the basis of a Morse-Pekeris potential and a polynomial expansion of the dipole-moment function M(r) Σsub(i)Msub(i)(r - rsub(e))sup(i) reduced to the first two terms. Owing to the importance of Fsub(vJ) they cannot be neglected when determining the rotational temperature of He₂ by spectroscopic methods involving line-intensity measurements. (author)

[en] The G⁰ parity-violation experiment at Jefferson Lab (Newport News, VA) is designed to determine the contribution of strange/anti-strange quark pairs to the intrinsic properties of the proton. In the forward-angle part of the experiment, the asymmetry in the cross section was measured for (rvec e)p elastic scattering by counting the recoil protons corresponding to the two beam-helicity states. Due to the high accuracy required on the asymmetry, the G⁰ experiment was based on a custom experimental setup with its own associated electronics and data acquisition (DAQ) system. Highly specialized time-encoding electronics provided time-of-flight spectra for each detector for each helicity state. More conventional electronics was used for monitoring (mainly FastBus). The time-encoding electronics and the DAQ system have been designed to handle events at a mean rate of 2 MHz per detector with low deadtime and to minimize helicity-correlated systematic errors. In this paper, we outline the general architecture and the main features of the electronics and the DAQ system dedicated to G⁰ forward-angle measurements

[en] To determine the efficacy and adverse effects of high intensity focused ultrasound (HIFU) for the treatment of local recurrence of prostate cancer after exclusive external beam radiotherapy. Seventy-two patients with histologically and biologically documented local recurrence after radiotherapy were treated by HIFU. The mean age was 68.27 ± 5.93 years, and mean PSA was 6.64 ± 7.26 ng/ml. Thirty patients were treated according to standard parameters and 42 according to specific parameters. ASTRO 2005 criteria, specific for salvage therapy (Phoenix consensus), were used to define recurrence. Progression-free survival was calculated by the Kaplan-Meier method. Mean follow-up was 39 ± 28 months. The negative biopsy rate was 80% and the median nadir PSA was 0.10 ng/ml. Specific survival was 94% at three years and 90% at five years, and progression-free survival was 50% at three years and 44% at five years. The urinary incontinence rate was 44% (grade 1: 12%, grade 2/3: 32%) and the urethral stricture or bladder neck stenosis rate was 30%. The use of specific parameters reduced the incidence of severe incontinence (19% versus 50, P ≡ 0.005) and stenosis (24% versus 40). Treatment with HIFU achieved a five-year progression-free survival of 44%, but patients must be clearly informed about the high rate of adverse effects. (authors)

[en] The workshop is dedicated to recent advances on science at high pressure at third generation synchrotron sources. A variety of experiments using synchrotron radiation techniques including X-ray diffraction, EXAFS (extended X-ray absorption fine structure), inelastic X-ray scattering, Compton scattering and Moessbauer spectroscopy of crystalline, liquid or amorphous samples, are reported. This document gathers the abstracts of the presentations