1,126 research outputs found
Some Observations Concerning Electronic Densities, Electrostatic Potentials and Chemical Potentials
The hypothesis that the electronic density distribution in a
molecule is qualitatively similar to the nuclear potential is shown.
to be in error in at least two cases-oxirane and cubane-although
it does hold true in a\u27 number of other systems. Its emphasis upon
the dominant role played by electrostatic internctions with the
nuclei is consistent with some approximate molecular energy formulas.
However, taking the nuclear potential as an approximation
to the electronic density misses the small effects that correspond
to the formation of chemical bonds. It is suggested that the electronic
density difference function should provide a rough picture
of the local variations in the chemical potential that occur as atoms
combine to form a molecule. Finally, the common practice of representing
the energy and electronegativity of an interacting atom
as functions only of the number of electrons associated with the
atom is shown to be ina\u27dequate; some account should be taken of
the changing internuclear separations
Classifying the Arithmetical Complexity of Teaching Models
This paper classifies the complexity of various teaching models by their
position in the arithmetical hierarchy. In particular, we determine the
arithmetical complexity of the index sets of the following classes: (1) the
class of uniformly r.e. families with finite teaching dimension, and (2) the
class of uniformly r.e. families with finite positive recursive teaching
dimension witnessed by a uniformly r.e. teaching sequence. We also derive the
arithmetical complexity of several other decision problems in teaching, such as
the problem of deciding, given an effective coding of all uniformly r.e. families, any such that
, any and , whether or not the
teaching dimension of with respect to is upper bounded
by .Comment: 15 pages in International Conference on Algorithmic Learning Theory,
201
Фотоэлектрохимическое окисление ацетилсалициловой кислоты
The progression of neurodegenerative diseases as well as healthy aging is accompanied by structural changes of the brain. These changes are often only subtle when considered over time intervals of several months. Therefore morphometrical techniques for their detection in longitudinally acquired MR images must be highly sensitive, and they require a careful validation. In the present study, a novel processing chain for a longitudinal analysis based on deformation field morphometry is described. Procedures for its quantitative validation are also reported: Deformation fields were computed for the simulation of non-linear, local structural changes of human brains. Applying these deformation fields to "original" MR images yielded deformed MR images. The volume changes defined by the deformation fields represented the standard, against which the results of the longitudinal analysis of each pair of original and deformed MR image were compared. The proposed processing chain enabled to localize and to quantify simulated local atrophies near the cortex as well as in deep brain structures. An exemplary analysis of serial MR images of a patient suffering from an atypical Parkinson syndrome (cortico-basal degeneration, CBD) and healthy control subjects is presented, showing a characteristic pattern of volume changes in the brain of the patient which is strikingly different from the controls' patterns of changes
Some Observations Concerning Electronic Densities, Electrostatic Potentials and Chemical Potentials
The hypothesis that the electronic density distribution in a
molecule is qualitatively similar to the nuclear potential is shown.
to be in error in at least two cases-oxirane and cubane-although
it does hold true in a\u27 number of other systems. Its emphasis upon
the dominant role played by electrostatic internctions with the
nuclei is consistent with some approximate molecular energy formulas.
However, taking the nuclear potential as an approximation
to the electronic density misses the small effects that correspond
to the formation of chemical bonds. It is suggested that the electronic
density difference function should provide a rough picture
of the local variations in the chemical potential that occur as atoms
combine to form a molecule. Finally, the common practice of representing
the energy and electronegativity of an interacting atom
as functions only of the number of electrons associated with the
atom is shown to be ina\u27dequate; some account should be taken of
the changing internuclear separations
Анализ и совершенствование системы адаптации персонала на предприятии
Цель работы анализ и совершенствование системы адаптации персонала на предприятии ООО "Суши-Маркет".
В соответствии с поставленной целью, в задачи работы входит:
1) рассмотрение теоретических основ найма и адаптации персонала;
2) проведение анализа действующей системы найма и адаптации персонала в ООО "Суши-Маркет";
3) внесение руководству рассматриваемой компании предложений по улучшению действующей системы найма и адаптации персонала.The purpose of the work is the analysis and improvement of the personnel adaptation system at the Sushi-Market LLC.
In accordance with the goal, the tasks of the work include:
1) consideration of the theoretical principles of recruitment and adaptation of personnel;
2) analysis of the current system of recruitment and adaptation of personnel in LLC "Sushi-Market";
3) submission to the management of the company in question of proposals for improving the current system of recruitment and adaptation of personnel
Multiple metal contamination from house paints: consequences of power sanding and paint scraping in New Orleans.
Power sanding exterior paint is a common practice during repainting of old houses in New Orleans, Louisiana, that triggers lead poisoning and releases more than Pb. In this study we quantified the Pb, zinc, cadmium, manganese, nickel, copper, cobalt, chromium, and vanadium in exterior paint samples collected from New Orleans homes (n = 31). We used interior dust wipes to compare two exterior house-painting projects. House 1 was measured in response to the plight of a family after a paint contractor power sanded all exterior paint from the weatherboards. The Pb content (approximately 130,000 microg Pb/g) was first realized when the family pet died; the children were hospitalized, the family was displaced, and cleanup costs were high. To determine the quantity of dust generated by power sanding and the benefits of reducing Pb-contaminated dust, we tested a case study house (house 2) for Pb (approximately 90,000 microg/g) before the project was started; the house was then dry scraped and the paint chips were collected. Although the hazards of Pb-based paints are well known, there are other problems as well, because other toxic metals exist in old paints. If house 2 had been power sanded to bare wood like house 1, the repainting project would have released as dust about 7.4 kg Pb, 3.5 kg Zn, 9.7 g Cd, 14.8 g Cu, 8.8 g Mn, 1.5 g Ni, 5.4 g Co, 2.4 g Cr, and 0.3 g V. The total tolerable daily intake (TTDI) for a child under 6 years of age is 6 microg Pb from all sources. Converting 7.4 kg Pb to this scale is vexing--more than 1 billion (10(9)) times the TTDI. Also for perspective, the one-time release of 7.4 x 10(9) microg of Pb dust from sanding compares to 50 x 10(9) microg of Pb dust emitted annually per 0.1 mile (0.16 km) from street traffic during the peak use of leaded gasoline. In this paper, we broaden the discussion to include an array of metals in paint and underscore the need and possibilities for curtailing the release of metal dust
The habenular nuclei: a conserved asymmetric relay station in the vertebrate brain
The dorsal diencephalon, or epithalamus, contains the bilaterally paired habenular nuclei and the pineal complex. The habenulae form part of the dorsal diencephalic conduction (DDC) system, a highly conserved pathway found in all vertebrates. In this review, we shall describe the neuroanatomy of the DDC, consider its physiology and behavioural involvement, and discuss examples of neural asymmetries within both habenular circuitry and the pineal complex. We will discuss studies in zebrafish, which have examined the organization and development of this circuit, uncovered how asymmetry is represented at the level of individual neurons and determined how such left–right differences arise during development
Accelerator measurements of magnetically-induced radio emission from particle cascades with applications to cosmic-ray air showers
For fifty years, cosmic-ray air showers have been detected by their radio
emission. We present the first laboratory measurements that validate
electrodynamics simulations used in air shower modeling. An experiment at SLAC
provides a beam test of radio-frequency (RF) radiation from charged particle
cascades in the presence of a magnetic field, a model system of a cosmic-ray
air shower. This experiment provides a suite of controlled laboratory
measurements to compare to particle-level simulations of RF emission, which are
relied upon in ultra-high-energy cosmic-ray air shower detection. We compare
simulations to data for intensity, linearity with magnetic field, angular
distribution, polarization, and spectral content. In particular, we confirm
modern predictions that the magnetically induced emission in a dielectric forms
a cone that peaks at the Cherenkov angle and show that the simulations
reproduce the data within systematic uncertainties.Comment: 5 pages, 7 figure
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