The purpose of this talk is to describe some recent progress in applying scaling concepts to various systems in nature. We review several systems characterized by scaling laws such as DNA sequences, heartbeat rates and weather variations. We discuss the finding that the exponent ff quantifying the scaling in DNA is smaller for coding than for noncoding sequences. We also discuss the application of fractal scaling analysis to the dynamics of heartbeat regulation, and report the recent finding that the scaling exponent ff is smaller during sleep periods compared to wake periods. We also discuss the recent findings that suggest a universal scaling exponent characterizing the weather fluctuations. Key words: DNA, heartbeat, weather, time series, scaling, fractals In the last decade it was realized that many systems in nature have no characteristic length or time scale, i.e., they have fractal -- or, more generally, scaling -- properties [1--15]. However, the fractal properties in different...

Abstract. We report on extensive elastic neutron scattering to determine the wave vector of the magnetic order in CeCu6−xAux single crystals for x> 0.1. For all values of x investigated (0.2, 0.3, 0.5, 1.0) we find long-range incommensurate antiferromagnetic order with an ordering vector Q ≈ (0.625 0 0.275) for x = 0.2, nearly unchanged for x = 0.3, and Q ≈ (0.59 0 0) for x = 0.5, staying roughly the same

Abstract. What is the lowest temperature to which one can trace the growth of the dephasing time τϕ in low-dimensional conductors? I consider the fundamental limitation, the crossover from weak to strong localization, as well as several experimental reasons for frequently observed saturation of τϕ (hot-electron effects, dephasing by external noise). Recent progress in our understanding of the electron-phonon interaction in disordered conductors is also briefly discussed.

Quantum information can be processed using large ensembles of ultracold and trapped neutral atoms, building naturally on the techniques developed for high-precision spectroscopy and metrology. This article reviews some of the most important protocols for universal quantum logic with trapped neutrals, as well as the history and state-of-the-art of experimental work to implement these in the laboratory. Some general observations are made concerning the different strategies for qubit encoding, transport and interaction, including trade-offs between decoherence rates and the likelihood of two-qubit gate errors. These trade-offs must be addressed through further refinements of logic protocols and trapping technologies before one can undertake the design of a general-purpose neutralatom quantum processor.

Comparison of the new data for the negative muon capture in 28 Si with the recent shell model calculations using a full 1s-0d model space and the USD empirical effective interaction and the one-nucleon weak current provides the induced pseudoscalar gP substantially smaller than the value predicted by PCAC and pion-pole dominance. We find that adding the effect from the one-pion exchange axial charge density and using the same scheme of calculations does not change situation to the value of gP. 1

Abstract. Experiments on quantum-state synthesis of trapped ions and their connection to trapped-electron g- 2 experiments are discussed briefly. The trapped-ion work has the overall goal of performing large-scale quantum information processing; however, the techniques employed can also be applied to fundamental tests and demonstrations of quantum mechanical principles, as well as to the improvement of quantum-limited measurements.

This article reviews two such applications: flux pinning in high-T c superconductors, and similarity search in DNA sequence alignment. The usual competition between the potential energy gain and kinetic energy cost that drives the localization-delocalization transition is replaced here by similar competitions between energy and entropy in one case, and correlated and random energies in another. Understanding of such processes can lead to enhanced performance of superconductors and improved algorithms for similarity searches.

We report on a high precision measurement at 15m from a 2800 MWth reactor in which 300000 events of electron antineutrino interactions with proton have been detected using an integral method. The cross section of the neutron inverse beta-- decay process has been measured with an accuracy of 1.4 %. The ratio of measured cross section to the expected one in the standard V-A theory of weak interactions is : oe f =oe V \GammaA = 98:7 % \Sigma 1:4 % \Sigma 2:7 % = 0:987 \Sigma 0:030 Keywords: Neutrinos - Weak interactions - Neutrino oscillation - Neutron detector - Nuclear power plants R'esum'e La section efficace de la r'eaction de capture de l'anti-neutrino 'el'ectronique sur proton a 'et'e mesur'ee avec une pr'ecision de 1.4 %. Cette mesure a 'et'e 'effectu'ee aupr`es d'un r'eacteur nucl'eaire de 2800 MWth. Dans cette exp'erience o`u seul le neutron issu de la r'eaction 'etait d'et'ect'e, 300000 'ev'enements ont 'et'e enregistr'es. Le rapport de la section efficace mesur'ee sur celle...

We propose to measure cross section and recoil polarization angular distributions for j electroproduction at Q 2 = 0:5 (GeV/c) 2 near the S 11 (1535) resonance. Measurements will be made on both sides of q covering the full range of c.m. angle in steps of 30 ffi , allowing the response functions R LT , R N LT , R 0L LT , R 0S LT , R 0L TT , and R 0S TT to be separated with high precision. These proposed measurements will be complete enough for multipole analysis. The R 0S TT response function is shown to provide a relatively model-independent measurement of jE 0+ j 2 . The unpolarized transverse response function, R T , may receive important contributions from the P 11 (1440) resonance, but those contributions are highly model dependent because neither the electroexcitation form factors nor the jN branching ratio for that resonance are known well. By contrast, P 11 resonances do not contribute in first-order to R 0S TT and the d-wave and nonresonant...

.2> 5 Northwestern University, Evanston, IL 60208 6 University of Oregon, Eugene, OR 97403 7 University of Pittsburgh, Pittsburgh, PA 15260 8 University of Rochester, Rochester, NY 14627 (September 1, 2000) A search for long-lived neutral particles (N 0 ) which decay into at least one muon has been performed using an instrumented decay channel at the E815 (NuTeV) experiment at Fermilab. The decay channel was composed of helium bags interspersed with drift chambers, and was used in conjunction with the NuTeV neutrino detector to search for N 0 decays. The data were examined for particles decaying into the muonic nal states , e, and . Three events were observed over an expected background of 0:040 0:009 events; no events were observed in the other