the main objective of this paper is to evaluate the effect of r&d on profitability of high -tech industries with new evidence from the iranian industries carrying four- digit codes. the structure- conduct- performance (scp) paradigm, which is relatively well known in industrial economics and in organization management, provides the theoretical construct that guides our empirical model formu...

FePt nanoparticles have great application potential in advanced magnetic materials such as ultrahigh-density recording media and high-performance permanent magnets. The key for applications is the very high uniaxial magnetocrystalline anisotropy of the L10-FePt phase, which is based on crystalline ordering of the face-centered tetragonal (fct) structure, described by the chemical-ordering param...

The occurrence of chemical ordering can have a dramatic influence on structural, electronic, and magnetic properties in many materials systems. Examples of recent interest are binary metallic alloy systems such as CoPt, FePt, and FeAu, where strong interdependencies between magnetic and magneto-optical properties and the degree of long range chemical ordering have been observed. Near the equiat...

FePt nanoparticles with a size of 4 nm were prepared by the polyol process according to the reaction route described by Sun et al. The particles were annealed at 550 C and 580 C for 30min in N2 atmosphere, developing coercivities of up to 8.8 kOe. From conventional transmission electron microscopy the coherence lengths of the self-assembly were found to be as large as 10mm in the as-prepared st...

We show that exposure from past business transactions – risk overhang – can reduce activity in related business lines, sometimes to the point where no new trade occurs. We focus primarily on the role of overhang in nonlife insurance market disruptions. Our model predicts that the relative impact, duration, and character of supply disruptions are related to the extent of overhang. These predicti...

In this paper we report results on the synthesis and magnetic properties of L10 FePt nanocomposite fi lms. Three fabrication methods have been developed to produce high-anisptropy FePt fi lms: non-epitaxial growth of (0 0 1)-oriented FePt:X (X=Ag, C) composite fi lms that might be used for perpendicular media; monodispersed FePt(CFx) core–shell nanocluster-assembled fi lms grown with a gas-aggr...