Compression and R-wave detection of ECG/VCG data

Application of information theory to eliminate redundant part of electrocardiogram or vectorcardiogram is described. Operation of medical equipment to obtain three dimensional study of patient is discussed. Use of fast Fourier transform to accomplish data compression is explained

Celebrating Garden Genius : A Handbook to Selected Gardens by Charles F. Gillette

Celebrating Garden Genius : A Handbook to Selected Gardens by Charles F. Gillette was created as part of the 1992 Charles F. Gillette Forum at The Lewis Ginter Botanical Garden in Richmond, Virginia. W. John Hayden, Professor of Biology at the University of Richmond, and Sheila Hayden, Biology Research Associate at the University of Richmond, served as editors of the handbook. _________________________________________Charles F. Gillette(1886-1969) Arriving in Richmond on November 9, 1911 —a dull, damp, dreary day—Charles F. Gillette began his career in the Southeast as clerk of the record for landscape architect Warren Manning, who, working with architects Cram, Goodhue and Ferguson, was responsible for building the new campus of the University of Richmond in Westhampton. As one of Warren Manning\u27s apprentices at the Tremont Street studio in Boston, Gillette had received invaluable training in landscape art. Manning, moreover, had served his apprenticeship under Frederick Law Olmsted and had shared in the work at Biltmore in Asheville, North Carolina. A tradition from Olmsted to Manning to Gillette had thus been born. By 1914, Gillette, recently wed, made a momentous decision. He would practice landscape architecture in Richmond, Virginia. Since that rainy day in 1911 Gillette did nothing less than create the image of Virginia gardens as they are known and loved today. Developing a distinctly regional landscape architecture, one geared, as Professor Reuben Rainey has observed, to the Piedmont and the Tidewater, he won the admiration of men and women as remote in time and place as Douglas South all Freeman, Paul Green, Ellen Glasgow, and Francis Pendleton Gaines. His designs remain today the paradigm of the Virginia garden. The genius loci of the middle Atlantic, Gillette was drawn to the spiritual in nature. The garden, etymologically an enclosing, was instinctually real to him as the paradisus was to the medieval basilica. Like Emerson, he knew, after all, that nature was language whereby God speaks to man. One senses that today in the magic of a Gillette garden. Gillette\u27s eclecticism is rich in the traditions of landscape art. The Georgian Revival, the Country Place Movement, the English cottage garden, the designs and motifs of Capability Brown, Inigo Jones, or Gertrude Jekyll form organically, in the vernacular, the Gillette look or the Southern garden. English boxwood, Virginia cedar, azalea, camellia, crepe myrtle, Cunninghamia, daffodil and yew, brick, stone, water, and bronze form the palette of his art. The native and the imported thrive side by side. One leaves the Gillette garden with the echo of a John Hersey line, True genius rearranges old material in a way never seen . . . before. --George C. Longesthttps://scholarship.richmond.edu/bookshelf/1204/thumbnail.jp

On black hole thermalization, D0 brane dynamics, and emergent spacetime

When matter falls past the horizon of a large black hole, the expectation from string theory is that the configuration thermalizes and the information in the probe is rather quickly scrambled away. The traditional view of a classical unique spacetime near a black hole horizon conflicts with this picture. The question then arises as to what spacetime does the probe actually see as it crosses a horizon, and how does the background geometry imprint its signature onto the thermal properties of the probe. In this work, we explore these questions through an extensive series of numerical simulations of D0 branes. We determine that the D0 branes quickly settle into an incompressible symmetric state -- thermalized within a few oscillations through a process driven entirely by internal non-linear dynamics. Surprisingly, thermal background fluctuations play no role in this mechanism. Signatures of the background fields in this thermal state arise either through fluxes, i.e. black hole hair; or if the probe expands to the size of the horizon -- which we see evidence of. We determine simple scaling relations for the D0 branes' equilibrium size, time to thermalize, lifetime, and temperature in terms of their number, initial energy, and the background fields. Our results are consistent with the conjecture that black holes are the fastest scramblers as seen by Matrix theory.Comment: 43 pages, 12 figures; v2: added analysis showing that results are consistent with and confirm Susskind conjecture on black hole thermalization. Added clarification about strong coupling regime. Citation adde

Matrix Element Distribution as a Signature of Entanglement Generation

We explore connections between an operator's matrix element distribution and its entanglement generation. Operators with matrix element distributions similar to those of random matrices generate states of high multi-partite entanglement. This occurs even when other statistical properties of the operators do not conincide with random matrices. Similarly, operators with some statistical properties of random matrices may not exhibit random matrix element distributions and will not produce states with high levels of multi-partite entanglement. Finally, we show that operators with similar matrix element distributions generate similar amounts of entanglement.Comment: 7 pages, 6 figures, to be published PRA, partially supersedes quant-ph/0405053, expands quant-ph/050211

High-Frequency Spin Waves in YBa2Cu3O6.15

Pulsed neutron spectroscopy is used to make absolute measurements of the dynamic magnetic susceptibility of insulating YBa2Cu3O6.15. Acoustic and optical modes, derived from in- and out-of-phase oscillation of spins in adjacent CuO2 planes, dominate the spectra and are observed up to 250 meV. The optical modes appear first at 74 meV. Linear-spin-wave theory gives an excellent description of the data and yields intra- and inter-layer exchange constants of J_parallel =125 meV and J_perp = 11 meV respectively and a spin-wave intensity renormalization Z_chi = 0.4.Comment: postscript, 11 pages, 4 figures, Fig.2 fixe

On Mutual Information in Multipartite Quantum States and Equality in Strong Subadditivity of Entropy

The challenge of equality in the strong subadditivity inequality of entropy is approached via a general additivity of correlation information in terms of nonoverlapping clusters of subsystems in multipartite states (density operators). A family of tripartite states satisfying equality is derived.Comment: 8 pages; Latex2e and Revtex

Decoupling with unitary approximate two-designs

Consider a bipartite system, of which one subsystem, A, undergoes a physical evolution separated from the other subsystem, R. One may ask under which conditions this evolution destroys all initial correlations between the subsystems A and R, i.e. decouples the subsystems. A quantitative answer to this question is provided by decoupling theorems, which have been developed recently in the area of quantum information theory. This paper builds on preceding work, which shows that decoupling is achieved if the evolution on A consists of a typical unitary, chosen with respect to the Haar measure, followed by a process that adds sufficient decoherence. Here, we prove a generalized decoupling theorem for the case where the unitary is chosen from an approximate two-design. A main implication of this result is that decoupling is physical, in the sense that it occurs already for short sequences of random two-body interactions, which can be modeled as efficient circuits. Our decoupling result is independent of the dimension of the R system, which shows that approximate 2-designs are appropriate for decoupling even if the dimension of this system is large.Comment: Published versio

Hastings' additivity counterexample via Dvoretzky's theorem

The goal of this note is to show that Hastings' counterexample to the additivity of minimal output von Neumann entropy can be readily deduced from a sharp version of Dvoretzky's theorem on almost spherical sections of convex bodies.Comment: 12 pages; v.2: added references, Appendix A expanded to make the paper essentially self-containe

A neutron scattering study of the interplay between structure and magnetism in Ba(Fe1−x_{1-x}Cox_{x})2_2As2_2

Single crystal neutron diffraction is used to investigate the magnetic and structural phase diagram of the electron doped superconductor Ba(Fe$_{1-x}$Co$_x$)$_2$As$_2$. Heat capacity and resistivity measurements have demonstrated that Co doping this system splits the combined antiferromagnetic and structural transition present in BaFe$_2$As$_2$ into two distinct transitions. For $x$=0.025, we find that the upper transition is between the high-temperature tetragonal and low-temperature orthorhombic structures with ($T_{\mathrm{TO}}=99 \pm 0.5$ K) and the antiferromagnetic transition occurs at $T_{\mathrm{AF}}=93 \pm 0.5$ K. We find that doping rapidly suppresses the antiferromagnetism, with antiferromagnetic order disappearing at $x \approx 0.055$. However, there is a region of co-existence of antiferromagnetism and superconductivity. The effect of the antiferromagnetic transition can be seen in the temperature dependence of the structural Bragg peaks from both neutron scattering and x-ray diffraction. We infer from this that there is strong coupling between the antiferromagnetism and the crystal lattice

Heat Conduction in the Vortex State of NbSe_2: Evidence for Multi-Band Superconductivity

The thermal conductivity kappa of the layered s-wave superconductor NbSe_2 was measured down to T_c/100 throughout the vortex state. With increasing field, we identify two regimes: one with localized states at fields very near H_c1 and one with highly delocalized quasiparticle excitations at higher fields. The two associated length scales are naturally explained as multi-band superconductivity, with distinct small and large superconducting gaps on different sheets of the Fermi surface. This behavior is compared to that of the multi-band superconductor MgB_2 and the conventional superconductor V_3Si.Comment: 5 pages, 4 figure