Determining the neural correlates of loss of balance during walking could lead to improved clinical assessment and treatment for individuals predisposed to falls. We used high-density electroencephalography (EEG) combined with independent component analysis (ICA) to study loss of balance during human walking. We examined 26 healthy young subjects performing heel-to-toe walking on a treadmill-mo...

The PEP-II B-Factory at SLAC has reached a luminosity of 4.6x10/cm/s and has delivered 94 fb of data to the BaBar physics detector by the end of May 2002. PEP-II has delivered over 309 pb in 24 hours and over 6.35 fb in one month. The accelerator physics issues for these performance levels include electron cloud, beam-beam effects, parasitic beam-beam collisions, and RF beam loading. Upgrades t...

Transverse resistive wall instability is analysed for antiprotons in the Recycler Ring. Damper requirements are formulated. 1 Growth Rate and Landau Damping 1.1 Coasting Beam Coherent instabilities are driven by the real part of impedance. For a coasting beam with insigni…cant frequency spread, the impedance-driven coherent tune shift at the harmonic number n is given by (see e. g. [1]) Z !Z=!0...

The best known element of the Kobayashi-Maskawa quark mixing matrix is U„d. It is determined' by comparing the vector coupling constant Gz of nuclear beta decay to the Fermi coupling constant Gz determined from muon decay, after correcting Gz for "inner" radiative effects' that depend upon the assumed substructure of the nucleon. An accurate determination of U„d is necessary to test the unitari...

$\beta$-Ga$_2$O$_3$ trench Schottky barrier diodes fabricated through a Gallium atomic beam etching technique, with excellent field strength and power device figure of merit, are demonstrated. Trench formation was accomplished by low-damage Ga flux etch that enables near-ideal forward operating characteristics independent fin orientation. The reverse breakdown greater than 5.10 MV/cm is demonst...

The properties of nuclei far from stability provide a stringent test of the validity of shell model Hamiltonians derived from data for nuclei near the valley of stability. Failure of shell model calculations to extrapolate to nuclei far from stability may indicate a breakdown of symmetries assumed in the model. Such a breakdown may provide evidence for new regions of deformation as were found f...

Thin epitaxial films of MnAs--promising candidates for the spin injection into semiconductors--are well known to undergo simultaneously a first-order structural and magnetic phase transition at 10-40 degrees C. The evolution of stress and magnetization of MnAs/GaAs(001), both measured quantitatively with our cantilever beam magnetometer at the coexistence region of alpha-MnAs and beta-MnAs, rev...

Simple formulas for optimization of VUV and X-ray SASE FELs are presented. The FEL gain length and the optimal beta-function are explicitly expressed in terms of the electron beam and undulator parameters. The FEL saturation length is estimated taking into account quantum diffusion in the undulator. Examples of the FEL optimization are given. Parameters of a SASE FEL, operating at the Compton w...

We discuss various issues concerning the interactions of nuclei with neutrinos of low impinging energies (i.e. having several tens of MeV to a few hundred MeV) of interest for particle physics, nuclear physics and astrophysics. We focus, in particular, on open questions as well as possible strategies to obtain more experimental information. The option of a low-energy beta-beam facility is exten...

I-Future damping rings for linear colliders will need to have very small vertical equilibrium emittances. In the limit of low beam current, the vertical emittance is primarily determined by the vertical dispersion and the beta-tron coupling. In this paper, the contributions to these effects from random misalignments are calculated and tolerances are derived to limit the vertical emittance with ...