1,125 research outputs found
Computer graphics interactive workshop for two-dimensional fractals
We present in this study an interactive computer graphics workshop for two-dimensional fractals. The workshop enables the user to learn about fractals through experimentation with the generation of Koch-like fractal curves. A variety of Koch-like fractal curves, Julia sets and the Mandelbrot set are presented as examples. Algorithms are presented for creating the Mandelbrot set and for creating Kock-like fractal curves. Keywords and Phrases: fractals, Kock-like Fractal curves, Julia sets, interactive computer graphicsU.S. Army Combat Development Experimentation
Center (USACDEC) under MIPR ATEC 46-86 and in part by funds provided through the
Commodore Grace Murray Hopper Research Chair in Computer Science at the Naval
Postgraduate School.http://archive.org/details/computergraphicsin00masoN0003986WRDQ200N
Merging fragments of classical logic
We investigate the possibility of extending the non-functionally complete
logic of a collection of Boolean connectives by the addition of further Boolean
connectives that make the resulting set of connectives functionally complete.
More precisely, we will be interested in checking whether an axiomatization for
Classical Propositional Logic may be produced by merging Hilbert-style calculi
for two disjoint incomplete fragments of it. We will prove that the answer to
that problem is a negative one, unless one of the components includes only
top-like connectives.Comment: submitted to FroCoS 201
A translational research experience in Argentina.
Background: The Argentinean programwas initiatedmore than a decade ago as the first experience of systematic
translational research focused on NCL in Latin America. The aim was to overcome misdiagnoses and
underdiagnoses in the region.
Subjects: 216 NCL suspected individuals from 8 different countries and their direct family members.
Methods: Clinical assessment, enzyme testing, electron microscopy, and DNA screening.
Results and discussion: 1) The study confirmed NCL disease in 122 subjects. Phenotypic studies comprised
epileptic seizures and movement disorders, ophthalmology, neurophysiology, image analysis, rating scales,
enzyme testing, and electron microscopy, carried out under a consensus algorithm; 2) DNA screening and
validation of mutations in genes PPT1 (CLN1), TPP1 (CLN2), CLN3, CLN5, CLN6, MFSD8 (CLN7), and CLN8:
characterization of variant types, novel/knownmutations and polymorphisms; 3) Progress of the epidemiological
picture in Latin America; and 4) NCL-like pathology studies in progress. The Translational Research Program was
highly efficient in addressing the misdiagnosis/underdiagnosis in the NCL disorders. The study of “orphan
diseases” in a public administrated hospital should be adopted by the health systems, as it positively impacts
upon the family's quality of life, the collection of epidemiological data, and triggers research advances. This article
is part of a Special Issue entitled: “Current Research on the Neuronal Ceroid Lipofuscinoses (Batten Disease)”publishedVersio
Beam Test of Silicon Strip Sensors for the ZEUS Micro Vertex Detector
For the HERA upgrade, the ZEUS experiment has designed and installed a high
precision Micro Vertex Detector (MVD) using single sided micro-strip sensors
with capacitive charge division. The sensors have a readout pitch of 120
microns, with five intermediate strips (20 micron strip pitch). An extensive
test program has been carried out at the DESY-II testbeam facility. In this
paper we describe the setup developed to test the ZEUS MVD sensors and the
results obtained on both irradiated and non-irradiated single sided micro-strip
detectors with rectangular and trapezoidal geometries. The performances of the
sensors coupled to the readout electronics (HELIX chip, version 2.2) have been
studied in detail, achieving a good description by a Monte Carlo simulation.
Measurements of the position resolution as a function of the angle of incidence
are presented, focusing in particular on the comparison between standard and
newly developed reconstruction algorithms.Comment: 41 pages, 21 figures, 2 tables, accepted for publication in NIM
Guidelines for incorporating scientific knowledge and practice on rare diseases into higher education: neuronal ceroid lipofuscinoses as a model disorder model disorder.
This article addresses the educational issues associated with rare diseases (RD) and in particular the Neuronal
Ceroid Lipofuscinoses (NCLs, or CLN diseases) in the curricula of Health Sciences and Professional's Training
Programs. Our aim is to develop guidelines for improving scientific knowledge and practice in higher education
and continuous learning programs.
Rare diseases (RD) are collectively common in the general populationwith 1 in 17 people affected by a RDin their
lifetime. Inherited defects in genes involved in metabolism are the commonest group of RD with over 8000
known inborn errors of metabolism. The majority of these diseases are neurodegenerative including the NCLs.
Any professional training program on NCL must take into account the medical, social and economic burdens
related to RDs. To address these challenges and find solutions to themit is necessary that individuals in the government
and administrative authorities, academia, teaching hospitals and medical schools, the pharmaceutical
industry, investment community and patient advocacy groups all work together to achieve these goals.
The logistical issues of including RD lectures in university curricula and in continuing medical education should
reflect its complex nature. To evaluate the state of education in the RD field, a summary should be periodically up
dated in order to assess the progress achieved in each country that signed up to the international conventions
addressing RD issues in society. It is anticipated that auditing current practice will lead to higher standards and
provide a framework for those educators involved in establishing RD teaching programs world-wide.publishedVersio
First Experimental Characterization of Microwave Emission from Cosmic Ray Air Showers
We report the first direct measurement of the overall characteristics of
microwave radio emission from extensive air showers. Using a trigger provided
by the KASCADE-Grande air shower array, the signals of the microwave antennas
of the CROME (Cosmic-Ray Observation via Microwave Emission) experiment have
been read out and searched for signatures of radio emission by high-energy air
showers in the GHz frequency range. Microwave signals have been detected for
more than 30 showers with energies above 3*10^16 eV. The observations presented
in this Letter are consistent with a mainly forward-directed and polarised
emission process in the GHz frequency range. The measurements show that
microwave radiation offers a new means of studying air showers at energies
above 10^17 eV.Comment: Accepted for publication in PR
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