Search results for "Diffusion"
showing 10 items of 1615 documents
Levels of Adoption in Organizational Implementation of E-Collaboration Technologies
2008
While the e-collaboration term only dates back a few years, its roots can be traced back at least two decades to the research and development in areas such as groupware, computer supported cooperative work (CSCW), group support systems (GSS), and computer-mediated communication (CMC). As defined by Kock (2005), the e-collaboration term can be seen to encompass a wide range of technologies supporting collaboration among indivduals engaged in a common task. In this article, the e-collaboration term thus incorporates previous research and practice within the areas mentioned above. The term organizational implementation is used to denote the process of introducing the technology in an organizat…
Digital innovations in rural micro-enterprises
2020
Digitalization gives micro-enterprises and rural areas new possibilities and it can support their competitiveness. In this paper, we have presented one way of supporting the diffusion and adoption of digital innovations in rural micro-enterprises. First, we examined the challenges and digital competence of the micro-enterprises in the rural areas of Central Finland to better understand what they needed. The second step was to develop a workshop concept. Theories of innovation diffusion and adoption were used as a base for these workshops. The last step was to evaluate the developed concept, its effects and challenges. We found that the workshop concept worked well for spreading information,…
Study of Toner Penetration in Papers by Laser Induced Plasma Spectroscopy and Optical Profilometry
2023
Four major toners are used in the printing industry, cyan, magenta, yellow and black (Key) for making color images on paper. Paper brands suitable for printing have thin mineral/latex coatings, and toners are applied on top of the coating in the printing process. Chemical compositions from toner to toner, as well as from coating to coating, vary according to the needs of the end user. Interactions between the toner and the coating define the final color formation of the images in printing. Hence, it is important to study characteristics and dynamics of toners on coated papers. In this paper, we have used laser-induced plasma spectroscopy (LIBS) to provide information on elemental distributi…
Study and optimization of freeze-drying cycles of a model probiotic strain
2018
This work is based on the experimental study of the freeze-drying process to understand the impact of numerous factors on the survival rates of a model probiotic strain of Lactobacillus casei type. With the aim to find out if cell density in the matrix and survival rates are linked, we have studied the location of the cells after freeze drying inside a porous matrix composed of a lactose basis with a polymer, the polyvinylpyrrolidone (PVP) in various amounts. The best survival rate were obtained at slow freezing rate for a formulation containing 5% (m/V) of lactose and 5% (m/V) of PVP. Keywords: Freeze-Drying; Freezing; Probiotics; L. Casei ATCC 393
Morphometry of microstromatolites in calcrete laminar crusts and a fractal model of their growth
1996
The laminar crust, constituting the upper part of calcretes (terrestrial CaCO3 accumulations inside surficial sediments), is a succession of thin layers of various colors and shapes resembling micro-stromatolites. The crust structure and its diagenetic evolution are similar to stromatolites. A quantitative study of its structure was made using image analysis. Euclidian parameters were calculated to describe lamina shape. Eight hundred and eighty-six laminae were divided into six classes from the flatest forms to columnar shapes. The geometrical relationships between the shapes are interpreted as steps in the growth process of the microstromatolite. A fractal model of laminar crust growth wa…
On mathematical modelling of the solid-liquid mixtures transport in porous axial-symmetrical container with Henry and Langmuir sorption kinetics
2018
In this paper we study diffusion and convection filtration problem of one substance through the pores of a porous material which may absorb and immobilize some of the diffusing substances. As an example we consider round cylinder with filtration process in the axial direction. The cylinder is filled with sorbent i.e. absorbent material that passed through dirty water or liquid solutions. We can derive the system of two partial differential equations (PDEs), one expressing the rate of change of concentration of water in the pores of the sorbent and the other - the rate of change of concentration in the sorbent or kinetical equation for absorption. The approximation of corresponding initial b…
A remark on infinite initial values for quasilinear parabolic equations
2020
Abstract We study the possibility of prescribing infinite initial values for solutions of the Evolutionary p -Laplace Equation in the fast diffusion case p > 2 . This expository note has been extracted from our previous work. When infinite values are prescribed on the whole initial surface, such solutions can exist only if the domain is a space–time cylinder.
Production technologies in stochastic continuous time models
2011
Abstract Properties of dynamic stochastic general equilibrium models can be revealed by either using numerical solutions or qualitative analysis. Very precise and intuition-building results are obtained by working with models which provide closed-form solutions. Closed-form solutions are known for a large class of models some of which, however, have some undesirable features such as potentially negative output. This paper offers closed-form solutions for models which are just as tractable but do not suffer from these shortcomings.
Technological and knowledge diffusion link: An international perspective 1870–2019
2021
Abstract Technology diffusion is a necessary but not sufficient condition for knowledge diffusion. Technological waves' impact on education differs across educational levels. We use data for 104 countries on technology diffusion and education from 1870 to 2019. We find six technology waves from 1870 to 2019 had a substantial and statistically significant educational attainment impact using fixed panel data modeling. The impact differs across time and regions, with the most noticeable impact in Advanced economies and Eastern Europe. Asia and the Pacific, Latin America and the Caribbean, Middle East, and North Africa are catching up with lagging Sub-Saharan Africa. The transportation revoluti…
Le son et le pouvoir en Bourgogne au XVe siècle
2000
Place: Paris Publisher: PUF