Photograph - DeVeaux Hall

Black and white, 12 cm x 17 cm photograph, mounted on board, of DeVeaux Hall in St. Catharines. Thomas Woodruff is shown in this photo. The photo was described by R.W. Band in 1973 and is included.

Postcard - W.D. Woodruff Homestead, DeVeaux Hall, St. Catharines, Ontario

A black and white postcard of the W.D. Woodruff homestead, DeVeaux Hall, St. Catharines, Ontario. See reverse for note.

Masonic photo album collection, Eureka Lodge #20, Prince Hall, Toronto, ca. 1970s-1980s

The collection consists of two photo albums from Eureka Lodge #20, Prince Hall, Toronto, Ontario. The first album consists of 57 colour photographs of Black Shriners and Masons, some featuring a trip to Puerto Rico, circa 1970. Several loose items are enclosed, including photographs, news clippings, and a certificate. The second album contains 26 colour photographs, and 9 loose photographs, circa 1980. Includes photographs of Arthur Downes, one of Canada’s first Black Canadian Grand Masters and Joe Halstead (Order of Canada). Most of the photographs feature members in the lodge interior.

Payment for the Hall account

Payment for the Hall account, May 28, 1883.

Letter to Samuel Woodruff regarding the $2000 owing to him and presenting applications for Williams, Sampson, Hall, Burrows and Rogers’s accounts

Letter (1 page, typed) to Samuel Woodruff regarding the $2000 owing to him and presenting applications for Williams, Sampson, Hall, Burrows and Rogers’s accounts. There are some handwritten comments on this letter. It is not signed, but bears the Jarvis, Conklin and Co. letterhead, May 16, 1882.

Letter of agreement to Welland D. Woodruff to pay Hamilton K. Woodruff $27, 500 for the property known as DeVeaux Hall

Letter of agreement to Welland D. Woodruff to pay Hamilton K. Woodruff $27, 500 for the property known as DeVeaux Hall.

Blueprint of proposed lily pond at DeVeaux Hall drawn by T. Wiley

Blueprint of proposed lily pond at DeVeaux Hall drawn by T. Wiley, Apr. 1916.

Catalogue of items from Devaux [DeVeaux] Hall to be sold in Toronto at auction

Catalogue of items from Devaux [DeVeaux] Hall to be sold in Toronto at auction on April 24-26, 1939. The list of items included items such as lamps, curtain rods, furniture, original art, vases, kitchen items and books. The auction was held in 6 sessions over a 3 day period. There were 855 items listed in the 45 page catalogue. The auction was put on by Ward-Price Auctioneers of Toronto, Apr. 1939.

Bracebridge hall

UANL

Géométrie noncommunicative et effet Hall quantique

Mémoire numérisé par la Division de la gestion de documents et des archives de l'Université de Montréal

Multiple edges of a quantum Hall system in a strong electric

In this paper we show that if the electrons in a quantum Hall sample are subjected to a constant electric field in the plane of the material, comparable in magnitude to the background magnetic field on the system of electrons, a multiplicity of edge states localized at different regions of space is produced in the sample. The actions governing the dynamics of these edge states are obtained starting from the well-known Schrödinger field theory for a system of nonrelativistic electrons, where on top of the constant background electric and magnetic fields, the electrons are further subject to slowly varying weak electromagnetic fields. In the regions between the edges, dubbed as the "bulk," the fermions can be integrated out entirely and the dynamics expressed in terms of a local effective action involving the slowly varying electromagnetic potentials. It is further shown how the bulk action is gauge noninvariant in a particular way, and how the edge states conspire to restore the U(1) electromagnetic gauge invariance of the system. In the edge action we obtain a heretofore unnoticed gauge-invariant term that depends on the particular edge. We argue that this term may be detected experimentally as different edges respond differently to a monochromatic probe due to this term

Parity violation in Aharonov-Bohm systems: The spontaneous Hall effect

We show how macroscopic manifestations of P (and T) symmetry breaking can arise in a simple system subject to Aharonov-Bohm interactions. Specifically, we study the conductivity of a gas of charged particles moving through a dilute array of flux tubes. The interaction of the electrons with the flux tubes is taken to be of a purely Aharonov-Bohm type. We find that the system exhibits a nonzero transverse conductivity, i.e., a spontaneous Hall effect. This is in contrast to the fact that the cross sections for both scattering and bremsstrahlung (soft-photon emission) of a single electron from a flux tube are invariant under reflections. We argue that the asymmetry in the conductivity coefficients arises from many-body effects. On the other hand, the transverse conductivity has the same dependence on universal constants that appears in the quantum Hall effect, a result that we relate to the validity of the mean-field approximation.

Factores que influyen en la aceptabilidad del uso de la vasectomía como estrategia para la disminución de embarazos no deseados por parte de miembros de las Fuerzas Militares de Colombia

Este trabajo de tesis se realizó con el objetivo de conocer y determinar, los factores que influyen en la aceptabilidad del uso de la vasectomía, como estrategia para la disminución de embarazos no deseados por parte de miembros de las Fuerzas Armadas de Colombia, buscando una estrategia adecuada para reducir costos del sistema de sanidad militar. Se realizo un estudio de tipo exploratorio - descriptivo con enfoque cuantitativo, en busca de identificar las causas de la baja participación de los hombres en la contracepción, donde se aplicó un instrumento de investigación, que fue una encuesta realizada a una población de 1.000 miembros Ejército Nacional de Colombia, de las cuales solo fueron validas 929 encuestas, puesto que las otras se encontraban incompletas, lo que indica que la muestra tiene el nivel de coherencia, pertinencia y confiabilidad, con lo cual los hallazgos que se presentan a continuación dan cuenta del objetivo propuesto Dentro de los resultados del estudio se encontró, que entre los factores más influyentes en la aceptabilidad del uso de la vasectomía, es la formación académica y el grado militar que tienen los miembros de las FFMM, se creería que es en respuesta que hay posibilidades de una mayor comprensión, sobre las consecuencias familiares, jurídicas y sociales que acarrea tener hijos que no han sido planificados o proyectados por la familia. Entre los hallazgos más importantes identificados, fue el evidenciar la disposición de los miembros de las FFMM en someterse a la vasectomía como un mecanismo de planificación familiar, situación que obedece principalmente al hecho de que un porcentaje representativo de los encuestados se mostraron de acuerdo con este tipo de intervenciones (62%), Si bien los militares encuestados reportaron un conocimiento sobre la vasectomía, vale señalar que el mismo es muy superficial, pues en aspectos fundamentales como la reversión, existe un desconocimiento en un grupo muy significativo de los encuestados. Existe un grupo significativo de encuestados que manifestaron no utilizar ningún tipo de preservativo, lo que implica un alto riesgo en el aumento de embarazos, siendo este un factor que puede influir en la aceptabilidad del uso de la vasectomía. La vasectomía como estrategia de planificación familiar, no es un mecanismo eficiente para prevenir el riesgo de contraer enfermedades de transmisión sexual.

Mining Events from Multimedia streams, Jon Hare

peaker(s): Jon Hare Organiser: Time: 25/06/2014 11:00-11:50 Location: B32/3077 Abstract The aggregation of items from social media streams, such as Flickr photos and Twitter tweets, into meaningful groups can help users contextualise and effectively consume the torrents of information on the social web. This task is challenging due to the scale of the streams and the inherently multimodal nature of the information being contextualised. In this talk I'll describe some of our recent work on trend and event detection in multimedia data streams. We focus on scalable streaming algorithms that can be applied to multimedia data streams from the web and the social web. The talk will cover two particular aspects of our work: mining Twitter for trending images by detecting near duplicates; and detecting social events in multimedia data with streaming clustering algorithms. I'll will describe in detail our techniques, and explore open questions and areas of potential future work, in both these tasks.

La insuficiencia de las disposiciones del pensamiento para cubrir la brecha del pensamiento crítico a la acción crítica

En esta tesis se evalúan las disposiciones del pensamiento crítico; se demuestra la circularidad de sus enunciados y, consecuencia de ello, su insuficiencia para cubrir la brecha que va de las habilidades del pensamiento crítico a la acción crítica.