Antenna technology: Antenna design and scale model techniques

Prototype antenna design and methods of measuring and predicting antenna characteristics when mounted on space shuttle scale model

PRICE TRANSMISSION, MARKET POWER AND RETURNS TO SCALE: A NOTE

In this paper, we aim to model the vertical relation between retailers and suppliers in the food industry whereby retailers exercise seller power in their relation with consumers and buyer power in their relation with producers. We then evaluate the degree of price transmission, relative to the perfectly competitive benchmark, from the farm to the retail sector assuming a supply shock. With the view to evaluating the impact of market power's interaction with industry technology on the degree of price transmission, we assume industry technology to be characterized by variable input proportions and non-constant returns to scale. Our model predicts that, relative to that which obtains when markets are perfectly competitive and industry technology is characterized by constant returns to scale, the degree of price transmission when market power and industry technology interact cannot be unambiguously determined.price transmission, returns to scale, market power

Price Transmission, Market Power and Returns to Scale

In this paper, we aim to model the vertical relation between retailers and suppliers in the food industry whereby retailers exercise seller power in their relation with consumers and buyer power in their relation with producers. We then evaluate the degree of price transmission, relative to the perfectly competitive benchmark, from the farm to the retail sector assuming a supply shock. With the view to evaluating the impact of market power's interaction with industry technology on the degree of price transmission, we assume industry technology to be characterised by variable input proportions and non-constant returns to scale. Our model predicts that, relative to that which obtains when markets are perfectly competitive and industry technology is characterised by constant returns to scale, the degree of price transmission when market power and industry technology interact cannot be unambiguously determined.price transmission, returns to scale, market power, Demand and Price Analysis, Marketing, L11, Q13,

Scale Externalities of the G7 Countries

Scale effects in per capita production are an outcome of many theoretical economic models like second generation growth models, models of the new trade theory or the new economic geography. The prediction is that larger economies should have a higher per capita production than smaller economies. However, in an open economy context the scale of the economy is less important because countries can participate in the scale of other countries through trade. This paper develops an open economy growth model of the second generation type which shows the relevance of the scale of the trading partners in technology goods for per capita production. This model is empirically tested using a cross section of 88 countries for the year 2000. The scale of these economies is measured by a weighted sum of scales of the G7 countries, since these are the countries spending most on R&D and are thus the main origin of technology. The results show that there is a significant effect of this scale variable on per capita production.growth and scale effects, international trade

The Dynamics of European Industrial Structure

Has the European integration process lead to increased specialisation and what drives changes in specialisation? To address these questions we apply a model that incorporates endowments, technology and increasing returns to scale (IRS). Analyses reveal that countries with high capital accumulation have become increasingly specialised in capital-intensive industries; this holds for both human and physical capital while countries have diverged (converged) in physical (human) capital abundance. No increased concentration of IRS industries to large markets is found. Analysing R&D indicates scale economies in R&D at the firm level and that firm level R&D is what drives competitiveness. Finally, there is robust evidence for a domestic interdependency in industries specialisation patterns.Specialisation; Productivity; Trade; Technology; Technology transfers; R&D

Seeing the wood for the trees: data-oriented translation

Data-Oriented Translation (DOT), which is based on Data-Oriented Parsing (DOP), comprises an experience-based approach to translation, where new translations are derived with reference to grammatical analyses of previous translations. Previous DOT experiments [Poutsma, 1998, Poutsma, 2000a, Poutsma, 2000b] were small in scale because important advances in DOP technology were not incorporated into the translation model. Despite this, related work [Way, 1999, Way, 2003a, Way, 2003b] reports that DOT models are viable in that solutions to ‘hard’ translation cases are readily available. However, it has not been shown to date that DOT models scale to larger datasets. In this work, we describe a novel DOT system, inspired by recent advances in DOP parsing technology. We test our system on larger, more complex corpora than have been used heretofore, and present both automatic and human evaluations which show that high quality translations can be achieved at reasonable speeds

A Macroscopic Mathematical Model For Cell Migration Assays Using A Real-Time Cell Analysis

Experiments of cell migration and chemotaxis assays have been classically performed in the so-called Boyden Chambers. A recent technology, xCELLigence Real Time Cell Analysis, is now allowing to monitor the cell migration in real time. This technology measures impedance changes caused by the gradual increase of electrode surface occupation by cells during the course of time and provide a Cell Index which is proportional to cellular morphology, spreading, ruffling and adhesion quality as well as cell number. In this paper we propose a macroscopic mathematical model, based on \emph{advection-reaction-diffusion} partial differential equations, describing the cell migration assay using the real-time technology. We carried out numerical simulations to compare simulated model dynamics with data of observed biological experiments on three different cell lines and in two experimental settings: absence of chemotactic signals (basal migration) and presence of a chemoattractant. Overall we conclude that our minimal mathematical model is able to describe the phenomenon in the real time scale and numerical results show a good agreement with the experimental evidences

Changing economic structures and impacts of shocks — evidence from a DSGE model for China

We construct a small-scale dynamic stochastic general equilibrium (DSGE) model that features price rigidities, habit formation in consumption and costs in capital adjustment, and calibrate the model with data for the Chinese economy. Our interest centers on the impact of technology and monetary policy shocks for different structures of the Chinese economy. In particular, we evaluate how a rebalancing of the economy from investment-led to consumption-led growth would affect the economic dynamics after a shock occurs. Our findings suggest that a rebalancing would reduce the volatility of the real economy in the event of a technology shock, which provides support for policies aiming to increase the consumption share in China.DSGE; rebalancing; monetary policy shocks; technology shocks; China