We study the effects of a German national cluster policy on the structure of collaboration networks. The empirical analysis is based on original data that was collected in fall 2011 and late summer 2013 with cluster actors (firms and public research organizations) who received government funding. Our results show that over time the program was effective in initiating new cooperation between clu...

A recent literature has criticised the sensitivity of a firm’s investment to its own cash flow as an adequate measure of financing constraints. In this paper we develop a new method to detect the presence of financing constraints at firm level. We consider a structural dynamic model of investment with financing imperfections and with both fixed and variable capital. We solve the model and simul...

Article history: Received 3 December 2012 Received in revised form 12 November 2013 Accepted 18 November 2013 Available online 7 December 2013

Precise and detailed knowledge of the dynamic characteristics of structt~res has become increasingly important in recent years. As a consequence, the accuracy of experbnental data, which is often used to validate and update fmite element models, has become extremely i”lporta”t. It has been shown expetientally [II that small changes in ambient temperature can cause distinct variations in the nat...

The realization that experimentally observed functional motions of proteins can be predicted by coarse-grained normal mode analysis has renewed interest in applications to structural biology. Notable applications include the prediction of biologically relevant motions of proteins and supramolecular structures driven by their structure-encoded collective dynamics; the refinement of low-resolutio...

ABSTRACT. Many analysis and design problems in engineering and science involve uncertainty to varying degrees. This paper is concerned with the structural vibration problem involving uncertain material or geometric parameters, specified as bounds on these parameters. This produces interval parameter values which may be interpreted as interval stiffness and mass matrices. However this approach p...

In the context of aircraft, shimmy is an oscillatory phenomenon of the landing gear mainly due to the tire and the landing gear structural dynamics. This phenomenon which can result in severe damage to the landing gear must be damped. This paper presents a new nose landing gear model including an actuator model and a simple tire/road interface description approximating the Pacejka model to allo...

We first consider the following inverse eigenvalue problem: givenX ∈ Cn×m and a diagonal matrix Λ ∈ Cm×m, find n×nHermite-HamiltonmatricesK andM such thatKX MXΛ. We then consider an optimal approximation problem: given n × n Hermitian matrices Ka and Ma, find a solution K,M of the above inverse problem such that ‖K−Ka‖ ‖M−Ma‖ min. By using the MoorePenrose generalized inverse and the singular v...

Fertility is being determined by the actual bearing of children and or the demand for children. It is a measure of rate at which population increases to itself by relating number of births to size of some selection of population such as number of married couples or number of women of child bearing age [1-3]. Fertility is high in Bangladesh even by the principles of developing countries. The red...