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The implementation of a "fast, automatic shimming technique by mapping along projections" (FASTMAP) on a 2.1-Tesla whole-body system is described. The method provides a localized adjustment of all first- (X, Y, Z) and second-order (Z2, ZX, ZY, X2-Y2, 2XY) ...
New photoemission data are presented for a series of Ce-doped or undoped, reduced or nonreduced, Nd cuprates. The data, taken with high signal-to-noise level in the constant-initial-state mode, demonstrate the presence of Cu+, in contrast with previous pho ...
Quantitative Secondary Ion Mass Spectrometry (SIMS) determination of oxygen incorporation in epitaxial AlGaAs/GaAs layers is strongly affected by the presence of oxygen adsorbed on the surface. By flooding the sample with oxygen isotope O18 during the anal ...
The measurement of the tokamak plasma ion temperature can be obtained by collective Thomson scattering. This method requires a far infrared laser to achieve useful spatial resolution for typical tokamak plasma parameters. The very low Thomson scattering cr ...
We have fabricated Y1Ba2Cu3O7-x step-edge junction dc superconducting quantum interference devices (SQUIDs) and characterized their noise performance. The current-voltage characteristics of our SQUIDs are of resistively shunted junction type with critical ...
Collective Thomson scattering, using a high-power pulsed D2O laser at 385-mu-m and a heterodyne receiver system, has provided local ion temperature (T(i)) measurements of the plasma in the tokamak chauffage Alfven (TCA) tokamak. Recent improvements in the ...
A CMOS low-noise amplifier (LNA) with two variable gain ranges of 6 and 9 dB is presented. Variable gain is realized by using linearized MOS resistive circuits (MRCs) as voltage-controlled resistors. One of these resistors is located in the feedback loop o ...
Improved experimental conditions enabled us to increase the signal-to-noise ratio of the photoemission spectra for the superconducting state of Bi2Ca2SrCu2O8, taken with high angular and energy resolution. This also enabled us to reveal a pronounced minimu ...
We consider a stochastic differential equation in which the noise is the sum of a white noise, a Poisson noise and a continuous time Markov chain. The probability densities governing the dynamics solve high order partial differential equations and the solu ...
Computer anal. of the multiplet structure of cross peaks in phase-sensitive 2-dimensional NMR correlation spectra allows one to trace out networks of coupled spins, to measure the magnitudes and signs of the scalar coupling consts., and to det. the no. of ...