Using mouse dynamics to assess stress during online exams

"Lecture notes in computer science series", ISSN 0302-9743, vol. 9121

Definition of multibody system

This chapter presents a general view of multibody system concept and definition by describing the main features associated with spatial systems. The mechanical components, which can be modeled as rigid or flexible, are constrained by kinematic pair of different types. Additionally, the bodies can be actuated upon by force elements and external forces due to interaction with environment. This chapter also presents some examples of application of multibody systems that can include automotive vehicles, mechanisms, robots and biomechanical systems.

Equations of motion for constrained systems

"Series title: Springerbriefs in applied sciences and technology, ISSN 2191-530X"

SIC Notícias: o lugar da política: estudo da programação semanal da SIC Notícias no período das 21 às 24 horas

Dissertação de mestrado em Ciências da Comunicação (área de especialização em Informação e Jornalismo)

Contact force models for multibody dynamics

"Series: Solid mechanics and its applications, vol. 226"

A individuação técnica na actualidade

Tese de doutoramento em Sociologia

On the frictional contacts in multibody system dynamics

"Series title: Computational methods in applied sciences, ISSN1871-3033, vol. 42"

Insights into bacterial colony morphology evolution and diversification during infection development in cystic fibrosis

Tese de Doutoramento em Engenharia Biomédica.

Estrategias reproductivas de lagartos del género tupinambis en distintos contextos ecológicos de la Provincia de Córdoba. Reproductive strategies of lizards of genus tupinambis in different ecological contexts of the Cordoba province.

Los caracteres de historia de vida son sensibles a la variación histórica o actual de los factores ambientales. Estudiar dicha variabilidad mediante la realización de estudios comparativos permite obtener evidencias sobre las causas de la evolución de ciertos caracteres. Los lagartos son excelentes modelos para el estudio de selección sexual y evolución del comportamiento social y reproductivo debido a que su relativa baja dispersión podría tener consecuencias evolutivas profundas en el desarrollo de distintas estrategias, ya que las poblaciones, al encontrarse más aisladas, podrían verse influenciadas por las fuerzas selectivas locales, mostrando una alta heterogeneidad espacial y temporal. Por eso nos propusimos realizar este trabajo para evaluar si existen diferentes estrategias reproductivas en los lagartos del género Tupinambis en distintos contextos ecológicos de la provincia de Córdoba. Para ello analizaremos distintas características de la historia de vida en poblaciones de estas especies tales como estructura de tamaño, sexo operativo, frecuencia reproductiva, tamaño de camada, condición corporal reproductiva, tamaño de madurez sexual, características espermáticas, elección de sitios de nidificación, etc. Además analizaremos la estructura genética de las poblaciones para inferir procesos demográficos históricos y patrones actuales de flujo génico y conectividad. The life history traits are sensitive to historical or current variation of environmental factors. Studying this variability by performing comparative studies allows obtaining evidence on the causes of the evolution of certain characters. Lizards are excellent models for studying sexual selection and evolution of social and reproductive behavior because their relatively low dispersal capabilities could have profound evolutionary consequences in the development of different strategies, since isolated populations may be stronger influenced by local selective forces, showing a high spatial and temporal heterogeneity. We decided to perform this study to assess whether there are different reproductive strategies in lizards of the genus Tupinambis in different ecological contexts of the Cordoba province. We will analyze different life history traits in populations of these species such as size structure, operational sex ratio, reproductive frequency, litter size, body condition, size at sexual maturity, sperm characteristics, choice of nesting sites, etc.. We also analyzed the genetic structure of populations to infer historical demographic processes and current patterns of gene flow and connectivity.

Ireland's biodegradable municipal waste

This project focuses on the EU Landfill Directive targets for Biodegradable Municipal Waste (BMW) specifically focusing on how the targets will affect Ireland and its waste management infrastructure. Research will consist of reviewing relevant literature, legislation and policies that will provide a comparable between Ireland and other nations. Planning processes which govern both the building structure and running capacities of treatment facilities is also necessary in order to predict amounts of waste diverted from landfill. The efficiency of these treatment plants also requires investigation. Another objective is to research further information on Irelands organic ‘brown’ bin service, this will involve discovering the roll out of bins in the future over a defined time scale as well as the potential amounts of waste that will be collected. Figures received from waste management and waste treatment companies will be combined with figures from the Environmental Protection Agency’s (EPA) annual reports. This will give an indication to past trends and shed light on possible future trends. With this information annul waste volumes consigned to landfill can be calculated and used to determine whether or not Ireland can achieve the EU Landfill Directive targets. Without significant investment in Irelands waste management infrastructure it is unlikely that the targets will be met. Existing waste treatment facilities need to be managed as efficiently as possible. Waste streams must also be managed so waste is shared appropriately between companies and not create a monopolising waste treatment facility. The driving forces behind an efficient waste management infrastructure are government policy and legislation. An overall and efficient waste management strategy must be in place, along with disincentives for landfilling of waste such as the landfill levy. Encouragement and education of the population is the fundamental and first step to achieving the landfill directive targets.

Optimising the design and manufacture of a customised, prescription fit, Maxillo-facial prosthesis

This thesis is a continuation of the Enterprise-Ireland Research Innovation Fund (RIF) Project entitled’ "Design and Manufacturing of Customised Maxillo-Facial Prostheses" The primary objective of this Internal Research Development Program (IRDP) project was to investigate two fundamental design changes 1 To incorporate the over-denture abutments directly into the implant. 2 To remove the restraining wings by the addition of screws, which affix the. implant to the dense material of the jawbone. The prosthetic was redesigned using the ANSYS Finite Element Analysis software program and analysed to* • Reduce the internal von Mises stress distribution The new prosthetic had a -63.63 % lower von Mises stress distribution when compared with the original prosthetic. • Examine the screw preload effects. A maximum relative displacement of 22 6 * lO^mm between the bone and screw was determined, which is well below the critical threshold of micromotion which prevents osseointegration • Investigate the prosthetic-bone contact interface. Three models of the screw, prosthesis, and bone, were studied. (Axisymmetnc, quarter volume, and full volume), a recommended preload torque of 0 32 Nm was applied to the prosthetic and a maximum von Mises stress of 1.988 MPa was predicted • Study the overdenture removal forces. This analysis could not be completed because the correct plastic multilinear properties of the denture material could not be established The redesigned prosthetic was successfully manufactured on a 3-axis milling machine with an indexing system The prosthetic was examined for dimensional quality and strength The research established the feasibility of the new design and associated manufacturing method.

Isothermal drying of pore networks : influence of pore structure on drying kinetics

Drying of porous media, pore network, pore structure, capillary forces, viscous forces, drying kinetics

Einfluss des Zylinderdruckverlaufes auf den Reibmitteldruck eines Benzinmotors mit Direkteinspritzung

Friction; tribology; gasoline direct injection; oil film thinkness; in-cylinder pressure; friction mean effective pressure; heat release; tangential piston forces; film temperatures

Environment conditions and biological innovations in the european agrarian growth, 1819-1939

The circumstances that were the driving forces behind Europe's economic growth beginning in the 19th century are diverse, and not easily prioritized. Until the 1970's, specifically, in Economy and Economic History, attention was focused on different institutional and technological variables, and various regularities were proposed. Nevertheless, new studies also underlined that the evolution of economic activity could not be understood considering only the new production possibilities offered by market economies. As a result, today it is also accepted that those processes can not be explained without considering two additional circumstances: the energy flows that sustained them, and the changes undergone in their transformation In this context, a question arises that takes on special importance. Which was the influence of the biological change in the economic growth?. A part of the flows of energy must be made into food, and this transformation can only happen with the participation.

Stability and asymptotic analysis of a fluid-particle interaction model

We are interested in coupled microscopic/macroscopic models describing the evolution of particles dispersed in a fluid. The system consists in a Vlasov-Fokker-Planck equation to describe the microscopic motion of the particles coupled to the Euler equations for a compressible fluid. We investigate dissipative quantities, equilibria and their stability properties and the role of external forces. We also study some asymptotic problems, their equilibria and stability and the derivation of macroscopic two-phase models.