319 research outputs found
Using the Geology of Your Neighbourhood and City for Geoscience Outreach
Most Canadians live, work and attend school in urban areas. Your neighbour-hood has wonders such as snow-bank stratigraphy, sidewalk sedimentology, and building stone. Urban fieldtrips require little money and little time to run and they can inspire participants. An inner-city school teacher confirmed my belief in urban fieldtrips when she said, “I’ve never been able to take my students anywhere but we can now take a city bus downtown and see the world. Thank You!” So open your eyes to the grand world of geology around you. Take others on a neighbourhood trip; you will inspire, motivate and educate them.
SOMMAIRE
La majorité des Canadiens vivent, travaillent et étudient en milieu urbain. Votre voisinage même offre des occasions d’émerveillement comme des exemples de stratigraphie de bancs de neige, de sédimentologie des trottoirs, et de pierres de construction. Les excursions urbaines sont peu coûteuses, prennent peu de temps et peu-vent s’avérer stimulantes pour leurs participants. Une enseignante d’une école en milieu urbain a confirmé mes idées sur les excursions urbaines lorsqu’elle a déclaré, « Je n’avais jamais pu sortir mes élèves, mais maintenant, nous pouvons prendre l’autobus et voir le monde, grâce à vous. » Soyez donc à l’affût de l’univers géologique qui pointe dans votre milieu. Amener les gens de votre entourage en excursion; vous les aurez intéressés, motivés et éduqués
Twisted Sector Yukawa Couplings For The Orbifolds
The moduli dependent Yukawa couplings between twisted sectors of Coxeter orbifolds are studied.Comment: 40 pages, SUSX-TH-92/1
Background Symmetries In Orbifolds With Discrete Wilson Lines
Target space symmetries are studied for orbifold compactified string theories
containing Wilson line background fields. The symmetries determined are for
those moduli which contribute to the string loop threshold corrections of the
gauge coupling constants. The groups found are subgroups of the modular group
and depend on the choice of discrete Wilson lines and the shape of
the underlying six-dimensional lattice.Comment: 31 pages, QMW--TH--94/0
Yukawa Couplings involving Excited Twisted Sector States for Orbifolds
A study is made for orbifolds of the modification
of the form of the twisted sector Yukawa couplings when some of the states
involved are excited twisted sectors rather than twisted sector ground states.Comment: 15 pages, SUSX--TH--93/1
Yukawa Couplings involving Excited Twisted Sector States for and Orbifolds
We study the Yukawa couplings among excited twist fields which might arise in
the low-energy effective field theory obtained by compactifying the heterotic
string on and orbifolds.Comment: SUSX--TH--93/12, 31 page
From Yang-Mills Lagrangian to MHV Diagrams
We prove the equivalence of a recently suggested MHV-formalism to the
standard Yang-Mills theory. This is achieved by a formally non-local change of
variables. In this note we present the explicit formulas while the detailed
proofs are postponed to a future publication.Comment: Latex,11 pages, minor changes, reference added, version to appear in
JHE
Gauge Coupling Constant Unification With Planck Scale Values Of Moduli
Convergence of the standard model gauge coupling constants to a common value
at around GeV is studied in the context of orbifold theories
where the modular symmetry groups for and moduli are broken to
subgroups of . The values of the moduli required for this
unification of coupling constants are studied for this case and also for the
case where string unification is accompanied by unification to a gauge group
larger then Comment: Tex, 15 pages, minor typos corrected and some references adde
Appraisal and composition of some traditional complementary foods for infant nutrition in Sierra Leone
Open Access Article; Published online: 09 Mar 2020Malnutrition among infants in Sierra Leone still ranks one of the highest globally. Potency of some locally-formulated complementary food at resolving the problem had been proven. The experiment aimed at evaluating nutrient contents in traditional
complementary foods consumed by infants in Eastern and Northern regions of Sierra Leone was carried out between 2016 and 2018. Ten common recipes identified through semi-structured questionnaire were standardized and analyzed using
standard laboratory methods. Data were analyzed using SAS statistical package while means were separated using the new Duncan’s Multiple Range Test. Results showed that Bennie-mix, pamahun, as well as pap prepared from rice, millet and
rice-one pot are richer in protein content (9.92% – 16.87%) and essential micronutrients (Iron ranged from 0.45mg – 3.58mg and zinc ranged from 1.24mg – 4.38mg). phytate (0.61mg – 3.76mg) and trypsin inhibitors (0.26mg – 5.79mg) which were low in all the selected samples as recommended by WHO. It can be concluded that four out of the ten standardized traditional complementary foods are rich in macronutrient but required enhancement of the micronutrients
A thermoresponsive and magnetic colloid for 3D cell expansion and reconfiguration
A dual thermoresponsive and magnetic colloidal gel matrix is described for enhanced stem-cell culture. The combined properties of the material allow enzyme-free passaging and expansion of mesenchymal stem cells, as well as isolation of cells postculture by the simple process of lowering the temperature and applying an external magnetic field. The colloidal gel can be reconfigured with thermal and magnetic stimuli to allow patterning of cells in discrete zones and to control movement of cells within the porous matrix during culture
Localized anomalies in orbifold gauge theories
We apply the path-integral formalism to compute the anomalies in general
orbifold gauge theories (including possible non-trivial Scherk-Schwarz boundary
conditions) where a gauge group G is broken down to subgroups H_f at the fixed
points y=y_f. Bulk and localized anomalies, proportional to \delta(y-y_f), do
generically appear from matter propagating in the bulk. The anomaly zero-mode
that survives in the four-dimensional effective theory should be canceled by
localized fermions (except possibly for mixed U(1) anomalies). We examine in
detail the possibility of canceling localized anomalies by the Green-Schwarz
mechanism involving two- and four-forms in the bulk. The four-form can only
cancel anomalies which do not survive in the 4D effective theory: they are
called globally vanishing anomalies. The two-form may cancel a specific class
of mixed U(1) anomalies. Only if these anomalies are present in the 4D theory
this mechanism spontaneously breaks the U(1) symmetry. The examples of five and
six-dimensional Z_N orbifolds are considered in great detail. In five
dimensions the Green-Schwarz four-form has no physical degrees of freedom and
is equivalent to canceling anomalies by a Chern-Simons term. In all other
cases, the Green-Schwarz forms have some physical degrees of freedom and leave
some non-renormalizable interactions in the low energy effective theory. In
general, localized anomaly cancellation imposes strong constraints on model
building.Comment: 30 pages, 4 figures. v2: reference adde
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