We build a quality ladders product cycle model with Northern innovation, Northern imitation, and Southern imitation. Our model generalizes Grossman and Helpman (1991a) to allow Northern imitation. Similar to Segerstrom (1991), successful Northern imitators collude with innovators. Changes in resources and R&D subsidies generate substitution in Northern R&D between innovation and imitation and s...

1. Recipe for the Universe All the popular models for structure formation are based on three key ingredients: (a) a model for the background universe (b) some mechanism for generating small perturbations in the early universe and (c) specification of the nature of the dark matter. The background universe is usually taken to be a Friedmann model with an expansion factor a(t). Such a model is com...

This paper deals with the composition and properties of solid solution calcium sulfoferrite. It was studied an influence s sulfoferrite on structure cement phases. Study hydration processes mineral are observed only short prismatic crystals. Prismatic crystals ferruginous ettringite always formed from any fraction. it found that smaller initial hydrating grains minerals, faster they hydrated. A...

A thermoplastically extruded snack was produced from different blends of corn grits and silver carp minced meat. Response Surface Methodology (RSM) was used to study the effect of fish meat content and to optimize the feed composition. Fourteen treatments from central composite design considering minced fish content (0-3 kg) and corn (7-10 kg) were used as the independent variables. The expansi...

A thermoplastically extruded snack was produced from different blends of corn grits and silver carp minced meat. Response Surface Methodology (RSM) was used to study the effect of fish meat content and to optimize the feed composition. Fourteen treatments from central composite design considering minced fish content (0-3 kg) and corn (7-10 kg) were used as the independent variables. The expansi...

Context-dependent models for language units are essential in high-accuracy speech recognition. However, standard speech recognition frameworks are based on the substitution of lowerlevel models for higher-level units. Since substitution cannot express context-dependency constraints, actual recognizers use restrictive model-structure assumptions and specialized code for context-dependent models,...

The reconngurable mesh model (RN-mesh) for parallel computations exhibits some \strong" results of algorithms involving a constant number of broadcasting steps. Naturally, one can ask whether or not these constants are tight. Consider an nn directed reconngurable mesh (DRN-mesh) that computes a function f(n) in a constant number of steps T (directed indicates that the edges of the mesh are dire...

We report a neutron scattering study of the instantaneous spin correlations in the two-dimensional spin S = 5/2 square-lattice Heisenberg antiferromagnet Rb2MnF4. The measured correlation lengths are quantitatively described, with no adjustable parameters, by high-temperature series expansion results and by a theory based on the quantum self-consistent harmonic approximation. Conversely, we fin...

We consider the linear heat equation with Dirichlet boundary conditions in a bounded domain of IR, n ≥ 1, and with a control acting on an lower-dimensional time-dependent manifold of dimension k ≤ n− 1. We analyze the approximate controllability problem. This problem is equivalent to a suitable uniqueness or unique-continuation property of solutions of the heat equation without control. More pr...