328 research outputs found
Case Study II: VG4 - Building and Land Use
Reproduced with permission of the publisher. © Authors and School of Archaeology and Ancient History, University of Leicester, 2004. Details of the full publication are available at: http://www.le.ac.uk/ar/research/pubs/catalogue.htm
Brane Realizations of Quantum Hall Solitons and Kac-Moody Lie Algebras
Using quiver gauge theories in (1+2)-dimensions, we give brane realizations
of a class of Quantum Hall Solitons (QHS) embedded in Type IIA superstring on
the ALE spaces with exotic singularities. These systems are obtained by
considering two sets of wrapped D4-branes on 2-spheres. The space-time on which
the QHS live is identified with the world-volume of D4-branes wrapped on a
collection of intersecting 2-spheres arranged as extended Dynkin diagrams of
Kac-Moody Lie algebras. The magnetic source is given by an extra orthogonal
D4-brane wrapping a generic 2-cycle in the ALE spaces. It is shown as well that
data on the representations of Kac-Moody Lie algebras fix the filling factor of
the QHS. In case of finite Dynkin diagrams, we recover results on QHS with
integer and fractional filling factors known in the literature. In case of
hyperbolic bilayer models, we obtain amongst others filling factors describing
holes in the graphene.Comment: Lqtex; 15 page
Electrical and structural characterisation of plasma-polymerized TEOS thin films as humidity sensors
In this study, we used plasma polymerization of TEOS to deposit thin water molecule sensitive layers on two intredigitated aluminum electrodes evaporated on glass substrate. Electrical and structural analyses of the deposited sensitive layers have been evaluated through current-impedance responses and FTIR spectroscopy. The elaborated humidity resistive sensor exhibited a detectable response to relative humidity (RH) percentages ranging from 20 to 95%. The films showed good sensitivity to water molecule due to the presence of hydroxyl groups OH. These groups provide the adsorption sites for water and play an important role to the humidity sensor properties. The low impedance, good sensitivity as characterized by a linear change in impedance from 106 to 103 Ω over RH interval of 20–80% and low observed hysteresis of about 4%, make the elaborated layer a promising candidate for humidity sensors development.In this study, we used plasma polymerization of TEOS to deposit thin water molecule sensitive layers on two intredigitated aluminum electrodes evaporated on glass substrate. Electrical and structural analyses of the deposited sensitive layers have been evaluated through current-impedance responses and FTIR spectroscopy. The elaborated humidity resistive sensor exhibited a detectable response to relative humidity (RH) percentages ranging from 20 to 95%. The films showed good sensitivity to water molecule due to the presence of hydroxyl groups OH. These groups provide the adsorption sites for water and play an important role to the humidity sensor properties. The low impedance, good sensitivity as characterized by a linear change in impedance from 106 to 103 Ω over RH interval of 20–80% and low observed hysteresis of about 4%, make the elaborated layer a promising candidate for humidity sensors development
On Hexagonal Structures in Higher Dimensional Theories
We analyze the geometrical background under which many Lie groups relevant to
particle physics are endowed with a (possibly multiple) hexagonal structure.
There are several groups appearing, either as special holonomy groups on the
compactification process from higher dimensions, or as dynamical string gauge
groups; this includes groups like SU(2),SU(3), G_2, Spin(7), SO(8) as well as
E_8 and SO(32). We emphasize also the relation of these hexagonal structures
with the octonion division algebra, as we expect as well eventually some role
for octonions in the interpretation of symmetries in High Energy Physics.Comment: 9 pages, Latex, 3 figures. Accepted for publication in International
Journal of Theoretical Physic
Embedding Fractional Quantum Hall Solitons in M-theory Compactifications
We engineer U(1)^n Chern-Simons type theories describing fractional quantum
Hall solitons (QHS) in 1+2 dimensions from M-theory compactified on eight
dimensional hyper-K\"{a}hler manifolds as target space of N=4 sigma model.
Based on M-theory/Type IIA duality, the systems can be modeled by considering
D6-branes wrapping intersecting Hirzebruch surfaces F_0's arranged as ADE
Dynkin Diagrams and interacting with higher dimensional R-R gauge fields. In
the case of finite Dynkin quivers, we recover well known values of the filling
factor observed experimentally including Laughlin, Haldane and Jain series.Comment: Latex, 14 pages. Modified version, to appear in IJGMM
Reproducibility and clinical relevance of the ocular response analyzer in nonoperated eyes: corneal biomechanical and tonometric implications
To assess the reproducibility of the ocular response analyzer (ORA) in
nonoperated eyes and the impact of corneal biomechanical properties on
intraocular pressure (IOP) measurements in normal and glaucomatous eyes. METHODS:
In the reliability study, two independent examiners obtained repeated ORA
measurements in 30 eyes. In the clinical study, the examiners analyzed ORA and
IOP-Goldmann values from 220 normal and 42 glaucomatous eyes. In both studies,
Goldmann-correlated IOP measurement (IOP-ORAg), corneal-compensated IOP
(IOP-ORAc), corneal hysteresis (CH), and corneal resistance factor (CRF) were
evaluated. IOP differences of 3 mm Hg or greater between the IOP-ORAc and
IOP-ORAg were considered outcome significant. RESULTS: Intraexaminer intraclass
correlation coefficients and interexaminer concordance correlation coefficients
ranged from 0.78 to 0.93 and from 0.81 to 0.93, respectively, for all parameters.
CH reproducibility was highest, and the IOP-ORAg readings were lowest. The median
IOP was 16 mm Hg with the Goldmann tonometer, 14.5 mm Hg with IOP-ORAg (P <
0.001), and 15.7 mm Hg with IOP-ORAc (P < 0.001). Outcome-significant results
were found in 77 eyes (29.38%). The IOP-ORAc, CH, and CRF were correlated with
age (r = 0.22, P = 0.001; r = -0.23, P = 0.001; r = -0.14, P = 0.02,
respectively), but not the IOP-ORAg or IOP-Goldmann. CONCLUSIONS: The ORA
provides reproducible corneal biomechanical and IOP measurements in nonoperated
eyes. Considering the effect of ORA, corneal biomechanical metrics produces an
outcome-significant IOP adjustment in at least one quarter of glaucomatous and
normal eyes undergoing noncontact tonometry. Corneal viscoelasticity (CH) and
resistance (CRF) appear to decrease minimally with increasing age in healthy
adults
Education for innovation and entrepreneurship in the food system: the Erasmus+ BoostEdu approach and results
Innovation and entrepreneurship are key factors to provide added value for food systems. Based on the findings of the Erasmus+ Strategic Partnership BoostEdu, the objective of this paper is to provide answers to three knowledge gaps: 1) identify the needs for innovation and entrepreneurship (I&E) in the food sector; 2) understand the best way to organize learning; 3) provide flexibility in turbulent times. BoostEdu aimed to provide a platform for continuing education within I&E for food professionals and was carried out through co-creation workshops and the development of an e-learning course. The results of the project in particular during the Covid-19 pandemics, highlighted the need for flexible access to modules that are complementary to other sources and based on a mix of theoretical concepts and practical experiences. The main lessons learned concern the need of co-creation and co-learning processes to identify suitable practices for the use of innovative digital technologies
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