Anàlisi de les tensions de xoc en una llanta de bicicleta

El “llantasso” és un fenomen que es produeix quan, mentre es circula en bicicleta,s’impacta fortament contra un esgraó o un obstacle de manera que tot l’aire contingut dins elpneumàtic es comprimeix. Si això succeeix, el pneumàtic contacta directament amb la llantai l’esgraó, essent l’únic element que els separa. És en aquest instant quan es produeixenunes tensions molt elevades sobre la llanta, les quals en són perjudicials estructuralment.En el present projecte s’han determinat analíticament aquestes tensions quan labicicleta circula a una velocitat de 5 m/s (18 km/h) i impacta contra un esgraó de 15 cmd’alçada. Es volia determinar si l’impacte arribava a produir deformació plàstica permanentde la llanta o si arribava a trencar-se completament.A més a més, també s’ha estudiat quina és la velocitat màxima a la qual pot circular labicicleta per tal que no es produeixi deformació plàstica permanent de la llanta, és a dir, queno es superi el límit elàstic del material.Es tracta d’un projecte totalment teòric, realitzat a través de programes informàtics. Enun primer pas s’ha dibuixat la bicicleta i el ciclista en AutoCAD per poder-ne fer la simulacióen el programa Working Model 2D i obtenir la força màxima que actua sobre la llanta en elmoment de l’impacte

Viagens pela unidade educacional e terapêutica, no estabelecimento prisional de Tires

No âmbito da unidade curricular, Estágio Profissional com Relatório Final, do 2.º ano do Mestrado em Teatro e Comunidade da Escola Superior de Teatro e Cinema, propus realizar um trabalho prático no Estabelecimento Prisional de Tires (EPT). O estágio decorreu de 15 de Maio a 22 de Julho de 2009, na Unidade Educacional e Terapêutica (UET) da prisão de Tires. Durante este período, desenvolvi o meu projecto de estágio, tendo sido sempre acompanhada pelo orientador responsável.

Toxicological Assessment of Coated versus Uncoated Rubber Granulates Obtained from Used Tires for Use in Sport Facilities

Reuse of tire crumb in sport facilities is currently a very cost-effective waste management measure. Considering that incorporation of the waste materials in artificial turf would be facilitated if the rubber materials were already colored green, coatings were specifically developed for this purpose. This paper presents an experimental toxicological and environmental assessment aimed at comparing the obtained emissions to the environment in terms of polycyclic aromatic hydrocarbons (PAHs), heavy metals, and ecotoxicity for coated and noncoated rubber granulates. This study is a comprehensive evaluation of the major potential critical factors related with the release of all of these classes of pollutants because previous studies were not systematically performed. It was concluded that between the two types of coatings tested, one is particularly effective in reducing emissions to the environment, simultaneously meeting the requirements of adherence and color stability.

Toxicological Assessment of Coated versus Uncoated Rubber Granulates Obtained from Used Tires for Use in Sport Facilities

Reuse of tire crumb in sport facilities is currently a very cost-effective waste management measure. Considering that incorporation of the waste materials in artificial turf would be facilitated if the rubber materials were already colored green, coatings were specifically developed for this purpose. This paper presents an experimental toxicological and environmental assessment aimed at comparing the obtained emissions to the environment in terms of polycyclic aromatic hydrocarbons (PAHs), heavy metals, and ecotoxicity for coated and noncoated rubber granulates. This study is a comprehensive evaluation of the major potential critical factors related with the release of all of these classes of pollutants because previous studies were not systematically performed. It was concluded that between the two types of coatings tested, one is particularly effective in reducing emissions to the environment, simultaneously meeting the requirements of adherence and color stability.

O grupo recreativo e dramático 1º de Maio de Tires. Dimensão social de uma colectividade recreativa

Trabalho de Projecto apresentado para cumprimento dos requisitos ncessários à obtenção de Mestre em Práticas Culturais para Municípios

Preliminary data on the performance of Aedes aegypti and Aedes albopictus immatures developing in water-filled tires in Rio de Janeiro

A monthly survey of Aedes aegypti and Aedes albopictus immatures in discarded tires at a site in metropolitan Rio de Janeiro showed that Ae. albopictus was much more abundant in the rainy season, but Ae. aegypti abundance showed a less clear seasonal pattern. Pupal masses for Ae. albopictus showed a seasonal trend. In contrast, Ae. aegypti pupae did not show any clear trend in weight. Large Ae. albopictus pupae were found in the warmer months, when water volume was higher, pH lower, and larval abundance lower. Further studies should be carried out to assess how seasonal variations in body size may impact vector competence of these species in Brazil.

« Divinités des Indoustans, tirées des pourans ou livres historiques en samscretam, à Faisabad, » par le colonel J.-B.-J. Gentil (1774).

Nombreuses miniatures.

Reliure de : Pensées chrétiennes tirées de l'Écriture sainte et des saints Pères pour tous les jours du mois, par M. É.-F. Vernage,...

Numérisation partielle de reliure