Channel waveguides in Ca4GdO(BO3)3 fabricated by He+ implantation for blue-light generation

Blue light at 405 nm is generated by frequency doubling of a Ti:sapphire tunable laser in He(+)-implanted channel waveguides in gadolinium calcium oxoborate crystal. A conversion efficiency of approximately 2% W(-1) cm(-2) is achieved between TM00 fundamental and TE01 harmonic modes.     

Heteroduplex mobility assay (HMA) pre-screening: An improved strategy for the rapid identification of inserts selected from phage-displayed peptide libraries

Phage-displayed peptide libraries represent an efficient toolto isolate peptides that bind a given target molecule. Afterseveral selection rounds, generally a large pool of targetbinding phages is obtained. Conventional analysis of theselected phage population involves extensive sequencing of many clones, mostof which can be identical. We have adapted the HeteroduplexMobility Assay (HMA) for pre-screening of phage inserts thatwere amplified by direct colony PCR of ELISA-positive clones.This strategy allowed for the rapid and reproducible assignment ofinsert sequences to different `heteroduplex migration groups'.Sequence analysis of only one representative of each HMAmigration group then completes the characterisation of thebinding phage population. In our model experiments,only 16% of HMA pre-screenedclones required further sequence analysis.     

High-fidelity single-photon source based on a Type II optical parametric oscillator

Using a continuous-wave Type II optical parametric oscillator below threshold, we have demonstrated a novel source of heralded single photons with high fidelity. The generated state is characterized by homodyne detection and exhibits a 79% fidelity with a single-photon Fock state (91% after correction of detection loss). The low admixture of vacuum and the well-defined spatiotemporal mode are critical requirements for their subsequent use in quantum information processing.     

EPR of Mn2+ doping unannealed single crystal of (La2O3)0.95(CeO2)0.05

X-band room temperature EPR spectra have been recorded for Mn²⁺ ion doping unannealed (La₂O₃)_0.95(CeO₂)_0.05 host crystal. The data are analysed using a rigorous least-squares fitting procedure in which a large number of lines characterized by ΔM = ± 1, Δm = 0 transition, obtained for several orientations of the static magnetic field, are simultaneously fitted. Combined with the knowledge of the absolute sign of the hyperfine interaction parameter. A, the hyperfine Hamiltonian parameters A, B, Q as reported in this paper, are given with their correct signs. The information on the linewidth is used to deduce the deviation of the crystal-field axes of different Mn²⁺ ions from the c axis; on the basis of the model proposed here these deviations are found to be between 0 and 10°.     

Two-dimensional electron fluid at high temperature

The two-dimensional and one-component plasma (OCP) model withr ^?1 interactions is investigated in the high-temperature limit, where the thermal wavelength gets larger than the classical distance of closest approach. Nonnegligible diffraction effects are rigorously taken care of (up toe ²) through a temperature-dependent effective interaction. Debye thermodynamics, analyzed in terms of a classical plasma parameter Λ, is shown to diverge as Λ Inh, whenh→0. There is no classical limit. A result at variance with the corresponding one in three dimensions.     

Projective embeddings of complex supermanifolds

We generalize the Kodaira Embedding Theorem and Chow's Theorem to the context of families of complex supermanifolds. In particular, we show that every family of super Riemann surfaces is a family of projective superalgebraic varieties.Research supported in part by NSF grant DMS-8704401Research supported in part by NSF grant DMS-4253943Research also supported in part by NSF grant DMS-4253943     

Etude de l'algorithme de Rémès en l'absence de condition de Haar

Summary Using a geometric interpretation, the unicity of a best approximation and the convergence of the Remes-algorithm without the Haar-condition are investigated (in the case of the Tchebycheff-approximation of a continuous function by a linear combination of two continuous functions). Replacing the Haar-condition by a weaker one which is generally satisfied, one obtains a convergence theorem that is weaker than the classical convergence theorem but is sufficient for the applicatons. A generalization of these results is indicated.     

Solution de l'équation de Fick avec source appliquée à la diffusion d'adatomes d'argent sur le cuivre

Résumé Une solution exacte de l'équation de Fick dans le cas où le diffusant provient d'une source circulaire ou linéaire est proposée. Elle tient compte de la diffusion en volume et en surface, et de lévaporation. On obtient la concentration en surface et en volume. On présente une application á la diffusion d'adatomes d'argent sur le plan (100) du cuivre.

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A solution of Fick's equation of diffusion, without approximations, is found in the case of atoms originating from a disc and a strip source. Surface and volume contributions, as well as evaporation has been considered. Both surface and volume concentrations can be obtained. Application to diffusion of silver adatoms on (100) plane of copper is presented.