Let s be an integer, f = f(n) a function, and H a graph. Define the Ramsey-Turán number RTs(n,H, f) as the maximum number of edges in an H-free graph G of order n with αs(G) < f , where αs(G) is the maximum number of vertices in a Ks-free induced subgraph of G. The Ramsey-Turán number attracted a considerable amount of attention and has been mainly studied for f not too much smaller than n. In ...

Although the prospect of obtaining patent protection is believed to encourage R&D investments and thus the rate of inventive activity, there is little by way of direct evidence to support this belief. We use original data from the 1994 Carnegie Mellon survey on the appropriation of R&D in the US manufacturing sector to empirically estimate a structural model linking a firm’s choice of the optim...

Measuring the private returns to R&D requires knowledge of its private depreciation or obsolescence rate, which is inherently variable and responds to competitive pressure. Nevertheless, most of the previous literature has used a constant depreciation rate to construct R&D capital stocks and measure the returns to R&D, a rate usually equal to 15 per cent. In this paper I review the implications...

awardness about structure of production technology and its characteristics is a usefull tool for planning in agricultural sector. in this regard, this study aims to determine some effective parameters of structure of production technology in rain fed barley production. before estimating these parameters, we examine the aggregation consistency condition for barley fields using the mean scaling t...

OBJECTIVES To evaluate the relative cost-effectiveness of introducing the RTS,S malaria vaccine in sub-Saharan Africa compared with further scale-up of existing interventions. DESIGN A mathematical modelling and cost-effectiveness study. SETTING Sub-Saharan Africa. PARTICIPANTS People of all ages. INTERVENTIONS The analysis considers the introduction and scale-up of the RTS,S malaria va...