Search results for "diffusion"
showing 10 items of 1615 documents
Estrategias locales de capacitación profesional y desarrollo local: el caso de Gandia, España
2009
En los últimos años, Gandia, una ciudad media del mediterráneo español, se ha convertido en un ejemplo de crecimiento económico mientras que, al mismo tiempo, enfrenta retos importantes. Estos incluyen la llegada de un relevante flujo de inmigrantes y la necesidad de adaptar el sistema económico local y el mercado de trabajo a un entorno cada vez más competitivo. Desde 1998 el Centro de Servicios Integrales de la municipalidad (CSI-COM) ha liderado un proceso de cooperación de los agentes locales para afrontar estos desafíos. CSI-COM constituye un ejemplo de buena práctica en la mejora del funcionamiento del mercado de trabajo local. Sus principales herramientas son la formación de recursos…
Nonlinear economic growth: Some theory and cross-country evidence
2007
Abstract This paper aims to test the existence of different growth regimes, that is of different relationships between growth rate and income level. We propose a simple nonlinear growth model and test its empirical implications by estimating Markov transition matrices and stochastic kernels. We show that growth is indeed nonlinear: a first phase of slow or zero growth is followed by a take-off and, finally, by a phase of deceleration. We discuss the relevance of these results with respect to the issue of convergence and reversibility of development, in the light of models of structural change and technological diffusion.
Knowledge Management in R&D Teams at a Spanish Technical University: Measurement and Relations with Organizational Culture
2015
The aim of this study was to create and analyze the psychometric properties of an instrument (Knowledge Creation and Dissemination Survey, KCD) to evaluate the knowledge management on Spanish R&D teams based on the Leonard-Barton’s (1995) model of knowledge flows. For this purpose, three different tasks were carried out: firstly analyzing the psychometric properties of the instrument; secondly, analyzing the knowledge management levels of the R&D teams at a technical university as well as the relationship between organizational culture and knowledge management. This instrument was developed to cover the existing gap in the evaluation of knowledge management. The “Knowledge Creation and Diss…
Business owners, employees, and firm performance
2018
The novel Finnish Longitudinal OWNer-Employer-Employee (FLOWN) database was used to analyze how the characteristics of owners and employees relate to firm performance as determined by labor productivity, survival, and employment growth. Focusing on the role of the employment history, the results show that previous experience in a high-productivity firm strongly predicts high productivity and probability of survival for the entrepreneur’s new firm. This can be interpreted as evidence of knowledge spillovers through labor mobility of both the owners and the employees. The results also show that the owner’s high education in a technical field is positively related to firm performance. Differen…
The Random-Time Binomial Model
1999
In this paper we study Binomial Models with random time steps. We explain, how calculating values for European and American Call and Put options is straightforward for the Random-Time Binomial Model. We present the conditions to ensure weak-convergence to the Black-Scholes setup and convergence of the values for European and American put options. Differently to the CRR-model the convergence behaviour is extremely smooth in our model. By using extrapolation we therefore achieve order of convergence two. This way it is an efficient tool for pricing purposes in the Black-Scholes setup, since the CRR model and its extrapolations typically achieve order one. Moreover our model allows in a straig…
A critical empirical study of three electricity spot price models
2012
We conduct an empirical analysis of three recently proposed and widely used models for electricity spot price process. The first model, called the jump-diffusion model, was proposed by Cartea and Figueroa (2005), and is a one-factor mean-reversion jump-diffusion model, adjusted to incorporate the most important characteristics of electricity prices. The second model, called the threshold model, was proposed by Roncoroni (2002) and further developed by Geman and Roncoroni (2006), and is an exponential Ornstein–Uhlenbeck process driven by a Brownian motion and a state-dependent compound Poisson process. It is designed to capture both statistical and pathwise properties of electricity spot pri…
On the property of diffusion in the spatial error model.
2005
International audience; The aim of this paper is to illustrate the property of global spillover effects in the first-order spatial autoregressive error model and the associated diffusion process of spatial shocks. An application is provided on a sample of 145 regions over 1989–1999 and highlights the most influential regions.
The electromigration and diffusion of hydrogen in molybdenum
1990
Abstract The electromigration and diffusion of hydrogen atoms in molybdenum were investigated using the resistance method in the temperature range 293–773 K. The following dependence of the diffusion coefficient D and electrical mobility vE on temperature were obtained: D = (5.3 ± 1.53) × 10 −10 exp {− (0.8 ± 0.01) eV kT } { m 2 s −1 } v E = (1.24 ± 0.19) × 10 −8 exp {− (0.9 ± 0.01) eV kT }{ m 2 ( V s ) −1 } . The hydrogen migrates towards the cathode and the effective valency grows with temperature, fulfilling the relation Z eff = (1.42 ± 0.03) − (5.0 ± 0.2) × 10 −8 (Ω m ) ρ ; where ρ is the specific electric resistance.
Electroluminescence TPCs at the thermal diffusion limit
2019
Artículo escrito por un elevado número de autores, solo se referencian el que aparece en primer lugar, el nombre del grupo de colaboración, si le hubiere, y los autores pertenecientes a la UAM
Electrochemical treatment of paper mill wastewater by electro-Fenton process
2019
Abstract The electrochemical oxidation of organics in paper mill wastewater belonging to Halfa industries (Tunisia) was performed by galvanostatic electrolyses using electro-Fenton (EF) process. The effect of several operating parameters, such as applied current density, electrodes material, air pressure and the presence of sodium chloride (NaCl) was evaluated. In particular, carbon felt (CF), modified carbon felt (MCF) and gas diffusion electrode (GDE) were used as cathode while Ti/IrO2-Ta2O5 and Boron Doped Diamond (BDD) as anode. Total Organic Carbon (TOC) measure was chosen as reference parameter to assess the extent of the treatment. The experimental results show that, by adopting the …