Twin Engines of Growth

We develop an endogenous growth model in which new technology and new skills are bounded complements they complement each other up to a point, but beyond this the impact of each factor is constrained by the level of the other. As a result, both technological progress and human capital accumulation are necessary for sustained productivity growth, but neither alone is sufficient. Rapid technological progress generates increased returns to education and encourages each generation to spend more time in school. Rapid human capital accumulation increases the feasibility and profitability of innovation and encourages the private business sector to allocate more resources towards R&D. Our model has important implications for the effectiveness of alternative growth promoting policies, for the interpretation of the empirical relationship between growth and schooling, and for the relationship between growth and intergenerational wage dispersion. Keywords: Endogenous technological change, endogenous human capital accumulation, minimum skill requirements, bounded complementarity.Endogenous technological change, endogenous human capital accumulation, minimum skill requirements, bounded complementarity.

Twin Engines of Growth

We develop an endogenous growth model in which new technology and new skills are bounded complements -- they complement each other to a point, but beyond this the impact of each factor is constrained by the level of the other. As a result, both technological progress and human capital accumulation are necessary for sustained productivity growth, but neither alone is sufficient. Rapid technological progress generates increased returns to education and encourages each generation to spend more time at school. Rapid human capital accumulation increases the feasability and profitability of innovation and encourages the private business sector to allocate more resources towards R&D. Our model has important implications for the effectiveness of alternative growth-promoting policies, for the interpretation of the empirical relationship between growth and schooling, and for the relationship between growth and intergenerational wage dispersion. Nous développons un modèle de croissance endogène dans lequel la nouvelle technologie et les nouvelles compétences sont des compléments limités -- elles se complémentent jusqu'à un certain point, au delà duquel l'impact de chaque facteur est contraint par le niveau de l'autre. Alors, le progrès technologique et l'accumulation de capital humain sont nécessaires les deux pour une croissance soutenue de la productivité, mais aucun n'est suffisant seul. Un progrès technologique rapide génère des rendements croissants de l'éducation et encourage chaque génération à consacrer plus de temps à l'école. Une accumulation rapide de capital humain accroît la faisabilité et la profitabilité de l'innovation et encourage le secteur privé à allouer plus de ressources en recherche et développement. Notre modèle a des implications importantes pour la relation empirique entre croissance et éducation, et pour la relation entre croissance et dispersion intergénérationnelle des salaires.Endogenous technological change, endogenous human capital accumulation, minimum skill requirements, bounded complementarity

L'efficacité de l'instruction hybride dans l'apprentissage d'une langue seconde un bref résumé /

Titre de l'écran-titre (visionné le 22 oct. 2007)iÉgalement disponible en format papie

The effectiveness of blended course instruction in second language learning final report, projet #PA2004-016 /

Titre de l'écran-titre (visionné le 27 sept. 2007)Également disponible en format papierBibliogr

The effectiveness of blended course instruction in second language learning final report, projet #PA2004-016 /

Titre de l'écran-titre (visionné le 27 sept. 2007)Également disponible en format papierBibliogr

The effectiveness of blended course instruction in second language learning a brief summary /

Titre de l'écran-titre (visionné le 22 oct. 2007)Également disponible en format papie

Facteurs favorisant l'insertion et le développement professionnels efficaces des nouveaux enseignants par les départements en milieu collégial article de vulgarisation /

Titre de l'écran-titre (visionné le 8 sept. 2009).Également disponible en format papier.Bibliogr

The HyMethShip Concept: An investigation of system design choices and vessel operation characteristics influence on life cycle performance

One potential method to decarbonize the maritime transport sector is by using onboard carbon capture technologies. One such potential future propulsion system is the "HyMethShip - Hydrogen-Methanol Ship propulsion system using onboard pre-combustion carbon capture" concept. In this study we use life cycle assessment to analyse the impact of system design choices on the overall environmental performance of the system. Using the HyMethShip on a vessel is shown to lower climate impact compared to today’s conventional propulsion technologies. The runtime of the carbon capture system and hydrogen leakage are indicated as the main influencers to the environmental performance besides overall system efficiency. The cost of the HyMethShip system is higher than today’s liquid fossil fuel options, but lower than when electro-methanol is used in a conventional engine without applying the HyMethShip concept

How do variations in ship operation impact the techno-economic feasibility and environmental performance of fossil-free fuels? A life cycle study

Identifying an obvious non-fossil fuel solution for all ship types for meeting the greenhouse gas reduction target in shipping is challenging. This paper evaluates the technical viability, environmental impacts, and economic feasibility of different energy carriers for three case vessels of different ship types: a RoPax ferry, a tanker, and a service vessel. The energy carriers examined include battery-electric and three electro-fuels (hydrogen, methanol, and ammonia) which are used in combination with engines and fuel cells. Three methods are used: preliminary ship design feasibility, life cycle assessment, and life cycle costing. The results showed that battery-electric and compressed hydrogen options are not viable for some ships due to insufficient available onboard space for energy storage needed for the vessel\u27s operational range. The global warming reduction potential is shown to depend on the ship type. This reduction potential of assessed options changes also with changes in the carbon intensity of the electricity mix. Life cycle costing results shows that the use of ammonia and methanol in engines has the lowest life cycle cost for all studied case vessels. However, the higher energy conversion losses of these systems make them more vulnerable to fluctuations in the price of electricity. Also, these options have higher environmental impacts on categories like human toxicity, resource use (minerals and metals), and water use. Fuel cells and batteries are not as cost-competitive for the case vessels because of their higher upfront costs and shorter lifetimes. However, these alternatives are less expensive than alternatives with internal combustion engines in the case of higher utilization rates and fuel costs