Lizzie Sloman and Son [n.d.]

Lizzie Sloman is pictured with her son, not identified by name, in this undated black and white photograph. The location of the photograph is also unknown. This item was in the possession of Rick Bell, of St. Catharines, whose mother Iris Sloman Bell, was sister to Lizzie.

Tintype of Sad Young Black Girl Perched on Bench [n.d.]

This unhappy looking young girl is featured in an early black and white tintype photograph. The date, location and name of the photographer are unknown. This small tintype was in the possession of Iris Sloman Bell, of St. Catharines, Ontario. The Sloman - Bell families have descendants who are former slaves from the United States."Tintypes were the invention of Prof. Hamilton Smith of Ohio. They begin as thin sheets of iron, covered with a layer of black paint. This serves as the base for the same iodized collodion coating and silver nitrate bath used in the ambrotype process. First made in 1856, millions were produced well into the twentieth century. When tintypes were finished in the same sorts of mats and cases used for ambrotypes, it can be almost impossible to distinguish which process was used without removing the image to examine the substrate." Source: American Museum of Photography http://www.photographymuseum.com/primer.html

Small Tintype of Young Black Woman, Seated [n.d.]

A young woman seated with arm resting on a side table is pictured in this small black and white tintype photograph. The date, location and name of the photographer are unknown. This tintype was among the family memorabilia in the possession of Iris Sloman Bell, of St. Catharines, Ontario. The Sloman - Bell families have relatives who were former slaves from the United States. They escaped to Canada and later settled in the London and St. Catharines areas of Ontario."Tintypes were the invention of Prof. Hamilton Smith of Ohio. They begin as thin sheets of iron, covered with a layer of black paint. This serves as the base for the same iodized collodion coating and silver nitrate bath used in the ambrotype process. First made in 1856, millions were produced well into the twentieth century. When tintypes were finished in the same sorts of mats and cases used for ambrotypes, it can be almost impossible to distinguish which process was used without removing the image to examine the substrate." Source: American Museum of Photography http://www.photographymuseum.com/primer.html

Woodruff Family fonds, 1784 – 1983, (non-inclusive)

The Woodruff Family Collection: From the time the Woodruff Family came to Canada from the United States in 1795, they took an active role in the forming of their communities both in a civic and social manner. This is evident through the documents contained in this collection. The Woodruffs played an active role in the battles fought in Upper Canada and they were an integral part of the Village of St. Davids. They were educated, business-minded and socially engaged. They accumulated much of their fortune through land dealings. Much of this collection focuses on Samuel DeVeaux Woodruff who was principally a businessman. His dedication to his work is shown through his numerous undertakings. He made his mark on the Niagara Peninsula through his work on the railways, roads, marsh land revisions, canals and the paper industry. He was also involved with the founding of the Long Point Company and he took control of building DeVeaux Hall down to the last detail. His offspring inherited his work ethic and his business acumen. The people who married into the Woodruff Family also possessed key social, political and business ties. Anne and Margaret Clement were from a staunch Loyalist background. Samuel Zimmerman was instrumental to the founding of Niagara Falls and Judge Samuel DeVeaux left behind a legacy for poor and homeless boys in Niagara Falls, New York. The Woodruff Family undoubtedly left a mark on the Niagara Peninsula. This collection brings to light many endeavours of the family and their varied contributions.

Photograph - Thomas Woodruff and Julia Cleveland Woodruff at DeVeaux Hall

Black and white, 12 cm x 17 cm photograph, mounted on board, of DeVeaux Hall in St. Catharines, Ontario. It was built by Samuel DeVeaux Woodruff. Shown in this photo are Thomas Woodruff and Julia Cleveland Woodruff. This photo was described by R.W. Band in 1973 and is included.

Photograph - Aunt Emma Woodruff and Julia Woodruff

Black and white, 13 cm x 9 cm black and white photo which has been taken from a scrapbook. This is a photo of Aunt Emma Woodruff and Julia Woodruff (Mrs. Warren Perry).

Photograph - Emma Osgood Mead, Osgood Woodruff, and Henry C. Woodruff

Black and white photograph, 6 ½ cm x 10 cm, of 2 women and a man. The inscription on the back reads “Emma Osgood Mead (“Blind Aunt Emma”), Osgood Woodruff and Henry C. Woodruff (Mrs. Percy Band’s father was a cousin to this ‘Uncle Henry’).

Photograph - House Interior, Staircase and Landing

Black and white photographs, 19 cm x 24 cm of the interior of an unidentified house showing the staircase and landing, looking down a hallway to an exterior door. The photograph was taken by Wurts Brothers General Photographers of New York City (2 copies).

Photograph - Julia Cleveland Woodruff and Margaret Julia Woodruff

Black and white photograph, 23 cm x 18 cm, of Julia Cleveland Woodruff posing with Margaret Julia Woodruff. Julia is seated and Margaret is standing. The photo was taken by Dudley Hoyt of New York.

Photograph - Margaret Julia Woodruff Band, Lace Dress and Wide-Brimmed Hat

Black and white photograph, 23 cm x 17 cm, of Margaret Julia Woodruff Band in a seated position, wearing a lace dress and wide- brimmed hat. The photo was taken by Dudley Hoyt of New York.

Photograph - Robert DeVeaux Woodruff Band and Percy Carruthers Band

Two black and white photographs in an ornate, folding silver case measuring 6 cm x 4 cm (when folded). This case contains two 4 ½ x 3 ½ photographs. One photograph is of Percy Carruthers Band and the other is Robert Band as a young man.

Essays in labor and public economics

Dans ma thèse, je me sers de modèles de recherche solides pour répondre à des questions importantes de politique publique. Mon premier chapitre évalue l’impact causal de l’allégeance partisane (républicain ou démocrate) des gouverneurs américains sur le marché du travail. Dans ce chapitre, je combine les élections des gouverneurs avec les données du March CPS pour les années fiscales 1977 à 2008. En utilisant un modèle de régression par discontinuité, je trouve que les gouverneurs démocrates sont associés à de plus faibles revenus individuels moyens. Je mets en évidence que cela est entrainée par un changement dans la composition de la main-d’oeuvre à la suite d’une augmentation de l’emploi des travailleurs à revenus faibles et moyens. Je trouve que les gouverneurs démocrates provoquent une augmentation de l’emploi des noirs et de leurs heures travaillées. Ces résultats conduisent à une réduction de l’écart salarial entre les travailleurs noir et blanc. Mon deuxième chapitre étudie l’impact causal des fusillades qui se produisent dans les écoles secondaires américaines sur les performances des éléves et les résultats des écoles tels que les effectifs et le nombre d’enseignants recruté, a l’aide d’une stratégie de différence-en-différence. Le chapitre est coécrit avec Dongwoo Kim. Nous constatons que les fusillades dans les écoles réduisent significativement l’effectif des élèves de 9e année, la proportion d’élèves ayant un niveau adéquat en anglais et en mathématiques. Nous examinons aussi l’effet hétérogene des tueries dans les écoles secondaires entre les crimes et les suicides. Nous trouvons que les fusillades de natures criminelles provoquent la diminution du nombre d’inscriptions et de la proportion d’élèves adéquats en anglais et mathématiques. En utilisant des données sur les élèves en Californie, nous confirmons qu’une partie de l’effet sur la performance des élèves provient des étudiants inscrits et ce n’est pas uniquement un effet de composition. Mon troisième chapitre étudie l’impact des cellulaires sur la performance scolaire des élèves. Le chapitre est coécrit avec Richard Murphy. Dans ce chapitre, nous combinons une base de données unique contenant les politiques de téléphonie mobile des écoles obtenues à partir d’une enquète auprès des écoles dans quatre villes en Angleterre avec des données administratives sur la performance scolaire des éleves. Nous étudions ainsi l’impact de l’introduction d’une interdiction de téléphonie mobile sur le rendement des éleves. Nos résultats indiquent qu’il y a une augmentation du rendement des éleves après l’instauration de l’interdiction des cellulaires à l’école, ce qui suggère que les téléphones mobiles sont sources de distraction pour l’apprentissage et l’introduction d’une interdiction à l’école limite ce problème.

Flexible microwave absorbers based on barium hexaferrite, carbon black, and nitrile rubber for 2–12 GHz applications

Flexile single layer electromagnetic wave absorbers were designed by incorporating appropriate amounts of carbon black in a nitrile butadiene rubber matrix along with an optimized amount of magnetic counterpart, namely, barium hexaferrite for applications in S, C, and X-bands. Effective dielectric permittivity and magnetic permeability were measured using cavity perturbation method in the frequency range of 2–12 GHz. The microwave absorbing characteristics of the composites were studied in the S, C, and X-bands employing a model in which an electromagnetic wave is incident normally on a metal terminated single layer. Reflection loss exceeding 20 dB is obtained for all the samples in a wide frequency range of 2–12 GHz when an appropriate absorber thickness between 5 and 9mm is chosen. The impact of carbon black is clearly observed in the optimized composites on the mechanical strength, thickness, band width of absorption, dielectric properties,

Valoración de empresas. Aplicación Modelo Black and Scholes

La presente tesis es un trabajo de investigación que trata sobre la aplicación del Modelo Black and Scholes para valorar empresas en el entorno ecuatoriano. Para tener una lógica sencilla y ordena se ha divido el trabajo en cuatro capítulos, los cuales tienen un objetivo específico cada uno y en su conjunto buscan responder las hipótesis planteadas en la tesis. El primer capítulo proporciona una idea general sobre los aspectos teóricos de la valoración de empresas, en este capítulo se encuentra la definición, los conceptos básicos, una explicación de cada uno de los métodos más importantes que se conoce actualmente. El propósito del capítulo es entender la valoración de empresas en su conjunto. El segundo capítulo se orienta en las bases conceptuales desarrolladas por el modelo Black and Scholes referente a valoración de opciones y su comparación con otros modelos, se toma este enfoque debido a que se cuenta con suficiente información para entender adecuadamente el modelo. La finalidad del capítulo es comprender el modelo de Black and Scholes para la valoración de opciones. El tercer capítulo analiza la aplicación del modelo Black and Scholes en la valoración de empresas a través de estudios previos, los fundamentos, las variables que se requieren y la forma de obtener las mismas. El capítulo tiene como propósito analizar la valoración de empresas aplicando el modelo Black and Scholes. El último capítulo se centra en realizar la aplicación práctica en el entorno ecuatoriano de valorar empresas a través del modelo Black and Scholes, en el mismo se describe paso a paso como se realizó la valoración y se detalla los resultados obtenidos. El objetivo del capítulo es aplicar los conocimientos desarrollados y obtener resultados que permitan tener fundamentos suficientes para obtener las conclusiones finales.

Thermogenic and metabolic consequences of thyroid hormone treatment in brown and white adipose tissue

Male rats were treated with triiodothyronine in the drinking water for 12 days. In vitro rates of isoprenaline stimulated lipolysis were significantly greater in brown but not white adipose tissue. Rates of [14C]glucose incorporation into triacylglycerols were significantly reduced in BAT (brown adipose tissue) and WAT (white adipose tissue) under basal and isoprenaline stimulated conditions. In a second experiment, hyperthyroid animals showed impaired weight gain, despite increased food intake during 19 days' treatment. Energy expenditure on days 5 and 12, and BAT core temperature differences (TBAT - TCORE) on day 19, were significantly greater than in control animals. Epididymal white fat pad weight was reduced and interscapular brown fat pad weight increased by triiodothyronine treatment.