139,971 research outputs found
Waveplate retarders based on overhead transparencies
We describe procedures for constructing inexpensive waveplates of desired
retardation out of ordinary commercially available transparencies. Various
relevant properties of the transparencies are investigated: the dependence of
retardation on rotation of the film, tilt, wavelength, position, and
temperature. Constructing waveplates out of combinations of transparency sheets
is also explored.Comment: 7 pages, 12 fig
IT integration, operations flexibility and performance: an empirical study
Purpose: This study examines the relationship between IT implementation and performance
with manufacturing flexibility based on a sample drawn from a set of manufacturing firms.
Design/methodology/approach: The relationships were analyzed using structural equations
modelling (SEM) using EQS 6.2 software. Previously, an explanatory factor analysis confirmed
one-dimensionality of the scales, Cronbach’s alpha was calculated to evaluate its internal
consistency and a confirmatory factor analysis was run to observe scales’ validity.
Findings: This research proves a significant positive and direct effect of IT implementation on
operations performance with 4 out of 6 flexibility dimensions (Machine, Labour, Material
handling and Volume). Mix and Routing flexibility dimensions show no significant impact on
firm performance.
Research limitations/implications: It is necessary to be cautious when generalizing this
findings these findings, as service firms were not part of the sample even when statistical results
prove robustness suggesting that the findings are quite reliable. Some flexibility dimensions show
no significant impact in performance (Routing and Mix flexibility). This is consistent with the fact
that these flexibility dimensions act as variability absorbers within the manufacturing process.
Future research lines: Future studies can focus on determining further internal and
environmental factors that affect operations flexibility according to specific sector characteristics.
Originality/value: This research proves a significant positive and direct effect of IT
implementation on operations performance. Results show not only the links between IT
implementation and operations performance, but also the magnitude of every impact. The model
considers IT integration as the degree of alignment that existing technology resources in a firm
have with the business strategy, in terms of importance and support for this strategyPeer Reviewe
On the metric compactification of infinite-dimensional spaces
The notion of metric compactification was introduced by Gromov and later
rediscovered by Rieffel; and has been mainly studied on proper geodesic metric
spaces. We present here a generalization of the metric compactification that
can be applied to infinite-dimensional Banach spaces. Thereafter we give a
complete description of the metric compactification of infinite-dimensional
spaces for all . We also give a full
characterization of the metric compactification of infinite-dimensional Hilbert
spaces.Comment: Minor typos corrected. References updated. Title changed. Results
unchange
Sound
Sound, basically characterized as air in motion
since ancient Greece, has been at the core of the
theories of many philosophers, as well as musicians,
poets, scientists, and theologians. Under
the auspices of Hellenic thought, Renaissance
scholars tried to define what sound is,
unveiling its vibrating forces to understand its
ability to shake the human body and soul. In
such a way, the ever-present metaphors of harmony
were much more than mere imagined,
unreal thoughts: through them, Renaissance
humanists shaped, organized, and understood
the structure and passions of the world itself.Este trabajo forma parte del proyecto de investigación “La obra musical renacentista: fundamentos, repertorios y prácticas” HAR 2015-70181-P (MINECO/FEDER, UE
Diagnosis of some diseases through biomarkers
Muchos gatos, como los perros, sufren de diferentes enfermedades. que en ese momento no permiten mostrar síntomas o signos que permiten identificar que la mascota sufre una enfermedad grave, ya que las características de los gatos son diferentes a las de los perros, ya que estos son depredadores, por lo tanto, el diagnóstico de las enfermedades en esta especie son difíciles y, en la mayoría de los casos, el diagnóstico se realiza durante las etapas avanzadas, lo que provoca un tratamiento difícil y un mal pronóstico. Estas enfermedades incluyen: cardiomiopatía hipertrófica felina, lipidosis hepática felina, virus de inmunodeficiencia felina, insuficiencia renal crónica y peritonitis infecciosa felina. Se requiere conocimiento sobre biomarcadores para poder dar el resultado. Los biomarcadores son una herramienta que aún no se conoce ampliamente y esto es necesario. Dado que permite mejorar la calidad de vida de los gatos y sus dueños, ya que los gatos se han vuelto cada vez más importantes como mascotas. Se estima que un alto porcentaje de la población mundial ha elegido tener gatos como mascotas debido a sus características fisiológicas y de comportamiento
Regularization of the triple collision in the collinear three body problem
This is a work about the collision of 3 celestial bodies which are aligned in a straight line, by following Newton's Gravitational Law. There is an introduction which shows the most important items of the general N-Body Problem in order to introduce the main concepts to work on with the main problem, which is the collinear 3-Body Problem. After this, at the conclusions we will see how the dynamics work for more than 3 bodies
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