8,907 research outputs found
A Memristor as Multi-Bit Memory: Feasibility Analysis
The use of emerging memristor materials for advanced electrical devices such as multi-valued logic is expected to outperform today's binary logic digital technologies. We show here an example for such non-binary device with the design of a multi-bit memory. While conventional memory cells can store only 1 bit, memristors-based multi-bit cells can store more information within single device thus increasing the information storage density. Such devices can potentially utilize the non-linear resistance of memristor materials for efficient information storage. We analyze the performance of such memory devices based on their expected variations in order to determine the viability of memristor-based multi-bit memory. A design of read/write scheme and a simple model for this cell, lay grounds for full integration of memristor multi-bit memory cell
A New Hypothesis on the Origin of the Three Generations
We suggest that the Standard Model may undergo a supercritical transition
near the Landau scale, where the U(1) gauge boson couples to the left and right
handed states of any given fermion with different charges. This scenario
naturally gives rise to three generations of fermion, corresponding to the
three critical scales for the right-right, right-left and left-left fermion
interactions going supercritical, as well as CP violation in the quark sector.Comment: 12 pages, LaTeX, To appear in Mod.Phys.Lett.A (1996
A polarised QCD condensate: nu p elastic scattering as a probe of U_A(1) dynamics
U_A(1) dynamics have the potential to induce a polarised condensate inside a
nucleon. The formation of this condensate is related to the realisation of
U_A(1) symmetry breaking by tunneling processes such as instantons. If it is
present, the polarised condensate induces a term in g_1 which has support only
at x=0. Tunneling processes then induce a net transfer of ``spin'' from finite
x to x=0. The polarised condensate may be measured by comparing the
flavour-singlet axial charges which are extracted from polarised deep inelastic
and nu p elastic scattering experiments.Comment: 13 pages LaTeX, Section 3 improved to include discussion of the 3
flavour quark instanton interaction; to appear in Mod. Phys. Lett.
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Low energy electron attachment to condensed formic acid
Dissociative electron attachment to formic acid in the condensed phase is studied using improved mass spectrometric detection of the negative ion fragments. The desorbed yields are measured as a function of incident electron energy in the range between 3 to 20 eV. Unlike previous work, the formation of the dehydrogenated anion HCOO? is observed and the signal to noise ratio is much higher for all other ions detected, i.e. OH?, O? and H?. Resonant structure seen in all anion yield functions, is attributed to dissociative electron attachment (DEA), whereas above 14 eV nonresonant dipolar dissociation (DD) dominates the desorption yields
The Drell-Hearn-Gerasimov Sum-Rule at Polarized HERA
We discuss the potential of polarized HERA to measure the spin dependent part
of the total photoproduction cross-section at large .Comment: 7 pages, LaTeX, 1 figure generated as fig1.tex. To appear in Proc.
Workshop on ``Physics with Polarized Protons at HERA'
Towards an understanding of nucleon spin structure: from hard to soft scales
The workshop "The Helicity Structure of the Nucleon" (BNL June 5, 2006) was
organized as part of the 2006 RHIC & AGS Users' Meeting to review the status of
the spin problem and future directions. The presentations can be found at
http://www.phenix.bnl.gov/WWW/publish/caidala/UsersHelicityWorkshop2006/ .
Recent data suggests small polarized glue and strangeness in the proton. Here
we present a personal summary of the main results and presentations. What is
new and exciting in the data, and what might this tell us about the structure
of the proton ?Comment: 20 pages, to appear in Int. J. Mod. Phys.
Effect of geometrical size of the particles in a hot and dense hadron gas
Incorporation of the finite size of baryons into the equation of state (EOS)
of a hot and dense hadron gas (HG) in a thermodynamically consistent manner has
been a much studied problem. We first review its current status. Various models
have been proposed in order to account for the repulsive force generated by the
hard-core geometrical size of the baryons resulting in an excluded volume
effect in the EOS. We examine the criterion of the thermodynamical consistency
of these models and summarize their shortcomings. In order to remove the
shortcomings, we propose a new model which incorporates the excluded volume
effect in a thermodynamically consistent manner. We find that the new model
works even for the cases of extremely large temperatures and densities where
most of other approaches fail. Furthermore, the new expressions for
thermodynamical variables resemble in form with those obtained from
thermodynamically inconsistent models and thus a useful correction factor has
been suggested here which converts inconsistent expressions into
thermodynamically consistent ones. Finally we compare the predictions of new
model with those obtained from various old models.Comment: 19 pages, 9 figures, accepted for publication in Phys. Rev.
Matrix isolation study of the photolysis of cyanogen azide. The infrared and ultraviolet spectra of the free radical NCN
Infrared and ultraviolet absorption spectra of free radical in photolysis of cyanogen azid
The Spin Structure of the Nucleon
This article reviews our present understanding of QCD spin physics: the
proton spin puzzle and new developments aimed at understanding the transverse
structure of the nucleon. We discuss present experimental investigations of the
nucleon's internal spin structure, the theoretical interpretation of the
different measurements and the open questions and challenges for future
investigation.Comment: Review, 43 pages, 23 figures, to appear in Reviews of Modern Physic
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