11,146 research outputs found
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Comment on: The Vitamin Dâ»Folate Hypothesis as an Evolutionary Model for Skin Pigmentation: An Update and Integration of Current Ideas, Nutrients 2018, 10, 554.
In response to a recent article by Jones et al. (Nutrients 10: 554â»568, 2018) [1], we agree that three distinctive features evolved in Homo erectus prior to the emergence of modern humans.[...]
A review of data visualization: opportunities in manufacturing sequence management.
Data visualization now benefits from developments in technologies that offer innovative ways of presenting complex data. Potentially these have widespread application in communicating the complex information domains typical of manufacturing sequence management environments for global enterprises. In this paper the authors review the visualization functionalities, techniques and applications reported in literature, map these to manufacturing sequence information presentation requirements and identify the opportunities available and likely development paths. Current leading-edge practice in dynamic updating and communication with suppliers is not being exploited in manufacturing sequence management; it could provide significant benefits to manufacturing business. In the context of global manufacturing operations and broad-based user communities with differing needs served by common data sets, tool functionality is generally ahead of user application
Low-lying Odd-parity States of the Nucleon in Lattice QCD
The world's first examination of the odd-parity nucleon spectrum at light
quark masses in 2+1 flavor lattice QCD is presented. Configurations generated
by the PACS-CS collaboration and made available through the ILDG are used, with
the lightest pion mass at 156 MeV. A novel method for tracking the individual
energy eigenstates as the quark mass changes is introduced. The success of this
approach reveals the flow of the states towards the physical masses. Using the
correlation matrix method, the two lowest-energy states revealed are found to
be in accord with the physical spectrum of Nature.Comment: 5 page
Roper Resonance in 2+1 Flavor QCD
The low-lying even-parity states of the nucleon are explored in lattice QCD
using the PACS-CS collaboration 2+1-flavor dynamical-QCD gauge-field
configurations made available through the International Lattice Datagrid
(ILDG). The established correlation-matrix approach is used, in which various
fermion source and sink smearings are utilized to provide an effective basis of
interpolating fields to span the space of low-lying energy eigenstates. Of
particular interest is the nature of the first excited state of the nucleon,
the Roper resonance of pion-nucleon scattering. The Roper
state of the present analysis approaches the physical mass, displaying
significant chiral curvature at the lightest quark mass. These full QCD
results, providing the world's first insight into the nucleon mass spectrum in
the light-quark regime, are significantly different from those of quenched QCD
and provide interesting insights into the dynamics of QCD.Comment: 7 pages, 5 figures. Revised version with new results to appear in PL
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Adapting the International System of Units to the twenty-first century
We review the proposal of the International Committee for Weights and Measures
(Comité International des Poids et Mesures, CIPM), currently being considered by
the General Conference on Weights and Measures (Conférences Générales des Poids et
Mesures, CGPM), to revise the International System of Units (Le SystĂšme International
dâUnitĂšs, SI). The proposal includes new definitions for four of the seven base units of
the SI, and a new form of words to present the definitions of all the units. The objective
of the proposed changes is to adopt definitions referenced to constants of nature, taken
in the widest sense, so that the definitions may be based on what are believed to be
true invariants. In particular, whereas in the current SI the kilogram, ampere, kelvin and
mole are linked to exact numerical values of the mass of the international prototype of the
kilogram, the magnetic constant (permeability of vacuum), the triple-point temperature
of water and the molar mass of carbon-12, respectively, in the new SI these units are linked
to exact numerical values of the Planck constant, the elementary charge, the Boltzmann
constant and the Avogadro constant, respectively. The new wording used expresses the
definitions in a simple and unambiguous manner without the need for the distinction
between base and derived units. The importance of relations among the fundamental
constants to the definitions, and the importance of establishing a mise en pratique for
the realization of each definition, are also discussed
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