64 research outputs found
The Possibilist Transactional Interpretation and Relativity
A recent ontological variant of Cramer's Transactional Interpretation, called
"Possibilist Transactional Interpretation" or PTI, is extended to the
relativistic domain. The present interpretation clarifies the concept of
'absorption,' which plays a crucial role in TI (and in PTI). In particular, in
the relativistic domain, coupling amplitudes between fields are interpreted as
amplitudes for the generation of confirmation waves (CW) by a potential
absorber in response to offer waves (OW), whereas in the nonrelativistic
context CW are taken as generated with certainty. It is pointed out that
solving the measurement problem requires venturing into the relativistic domain
in which emissions and absorptions take place; nonrelativistic quantum
mechanics only applies to quanta considered as 'already in existence' (i.e.,
'free quanta'), and therefore cannot fully account for the phenomenon of
measurement, in which quanta are tied to sources and sinks.Comment: Final version with some minor corrections as published in Foundations
of Physics. This paper has significant overlap with Chapter 6 of my book on
the Transactional Interpretation, forthcoming from Cambridge University
Press:
http://www.cambridge.org/us/knowledge/isbn/item6860644/?site_locale=en_US
(Additional preview material is available at rekastner.wordpress.com)
Comments welcom
Premature browning in cooked ground beef after modifying myoglobin
Some ground beef patties developed an
internal, brown cooked color and looked well-done
at temperatures as low as 131 ÌF, whereas
normal patties were re d to pink. The premature
brown color was not relate d to percent fat; patty
compaction; animal source and maturity; pH
(5.5 to 5.8); or concentrations of raw patty
heme and nonhemeiron, myoglobin, and total
pigment. Because oxidation-reduction potential
and total reducing activities were higher (P<.05)
and TBA numbers were lower (P<.05) in
normal than prematurely brown patties, the
brown color is apparently related to greater
patty oxidation
Doping and temperature dependence of incommensurate antiferromagnetism in underdoped lanthanum cuprates
The doping, temperature and energy dependence of the dynamical spin structure
factors of the underdoped lanthanum cuprates in the normal state is studied
within the t-J model using the fermion-spin transformation technique.
Incommensurate peaks are found at ,
at relatively low temperatures with linearly
increasing with doping at the beginning and then saturating at higher dopings.
These peaks broaden and weaken in amplitude with temperature and energy, in
good agreement with experiments. The theory also predicts a rotation of these
peaks by at even higher temperatures, being shifted to .Comment: 11 pages, PDF file, six figures are included, accepted for
publication in Physical Review
Spectral and transport properties of doped Mott-Hubbard systems with incommensurate magnetic order
We present spectral and optical properties of the Hubbard model on a
two-dimensional square lattice using a generalization of dynamical mean-field
theory to magnetic states in finite dimension. The self-energy includes the
effect of spin fluctuations and screening of the Coulomb interaction due to
particle-particle scattering. At half-filling the quasiparticles reduce the
width of the Mott-Hubbard `gap' and have dispersions and spectral weights that
agree remarkably well with quantum Monte Carlo and exact diagonalization
calculations. Away from half-filling we consider incommensurate magnetic order
with a varying local spin direction, and derive the photoemission and optical
spectra. The incommensurate magnetic order leads to a pseudogap which opens at
the Fermi energy and coexists with a large Mott-Hubbard gap. The quasiparticle
states survive in the doped systems, but their dispersion is modified with the
doping and a rigid band picture does not apply. Spectral weight in the optical
conductivity is transferred to lower energies and the Drude weight increases
linearly with increasing doping. We show that incommensurate magnetic order
leads also to mid-gap states in the optical spectra and to decreased scattering
rates in the transport processes, in qualitative agreement with the
experimental observations in doped systems. The gradual disappearence of the
spiral magnetic order and the vanishing pseudogap with increasing temperature
is found to be responsible for the linear resistivity. We discuss the possible
reasons why these results may only partially explain the features observed in
the optical spectra of high temperature superconductors.Comment: 22 pages, 18 figure
Strategies for Controlled Placement of Nanoscale Building Blocks
The capability of placing individual nanoscale building blocks on exact substrate locations in a controlled manner is one of the key requirements to realize future electronic, optical, and magnetic devices and sensors that are composed of such blocks. This article reviews some important advances in the strategies for controlled placement of nanoscale building blocks. In particular, we will overview template assisted placement that utilizes physical, molecular, or electrostatic templates, DNA-programmed assembly, placement using dielectrophoresis, approaches for non-close-packed assembly of spherical particles, and recent development of focused placement schemes including electrostatic funneling, focused placement via molecular gradient patterns, electrodynamic focusing of charged aerosols, and others
CaracterĂsticas da Carcaça e Qualidade da Carne de Tourinhos Alimentados com Dietas de Alta Energia
CaracterĂsticas de carcaça e composição corporal de touros jovens da raça Nelore terminados em diferentes sistemas
Bacteriological Quality of Hot-Boned Primal Cuts from Electrically Stimulated Beef Carcasses
Factors affecting premature browning in cooked ground beef
Some ground beef patties developed an
internal, brown cooked color and looked well-done
at temperatures as low as 13 1EF, whereas
normal patties were re d to pink. The premature
brown color was not relate d to percent fat; patty
compaction; animal source and maturity; pH
(5.5 to 5.8); or concentrations of raw patty
heme and nonhemeiron, myoglobin, and total
pigment. Because oxidation-reduction potential
and total reducing activities were higher (P<.05)
and TBA numbers were lower (P<.05) in
normal than prematurely brown patties, the
brown color is apparently related to greater
patty oxidation
Effects of Electrical Stimulation, Aging, and Blade Tenderization on Hot-Boned Beef Psoas major and Triceps brachii Muscles
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