Agglomeration and directional imbalance of freight rates : the role of density economies in the transport sector

This paper examines the conventional assumption that bilateral transport costs are symmetric. We develop an economic geography model with transport sector in which asymmetric freight rates can occur as a result of density economies. Comparing this to models without density economies, we show that agglomeration of economic activities is more likely to emerge and that multiple equilibria can emerge for some parameters. Then we show the change in its bifurcation and stability of equilibrium and conclude that economies of density in transport flows can act as an agglomeration force.

Neural network controller for active demand side management with PV energy in the residential sector

In this paper, we describe the development of a control system for Demand-Side Management in the residential sector with Distributed Generation. The electrical system under study incorporates local PV energy generation, an electricity storage system, connection to the grid and a home automation system. The distributed control system is composed of two modules: a scheduler and a coordinator, both implemented with neural networks. The control system enhances the local energy performance, scheduling the tasks demanded by the user and maximizing the use of local generation.

Equity pricing in the mining sector: evidence from NYSE and LSE

The study examines the Capital Asset Pricing Model (CAPM) for the mining sector using weekly stock returns from 27 companies traded on the New York Stock Exchange (NYSE) or on the London Stock Exchange (LSE) for the period of December 2008 to December 2010. The results support the use of the CAPM for the allocation of risk to companies. Most companies involved in precious metals (particularly gold), which have a beta value less than unity (Table 1), have been actuated as shelter values during the financial crisis. Values of R2 do not shown very explanatory power of fitted models (R2 < 70 %). Estimated coefficients beta are not sufficient to determine the expected returns on securities but the results of the tests conducted on sample data for the period analysed do not appear to clearly reject the CAPM

PPP in the agriculture sector for human and sustainable developmen

En el contexto de las negociaciones de la futura agenda de desarrollo post-2015, se ha reconocido la necesidad de construir partenariados entre los diferentes actores implicados, y entre estos, el papel fundamental que el sector privado juega en la implementación y logro de los futuros objetivos de desarrollo sostenible. Por otra parte, una de los retos más imperantes de la futura agenda será la erradicación de la pobreza y el hambre, dos males que van frecuentemente de la mano. Con este contexto, el trabajo tiene con objetivo averiguar el impacto y las posibilidades que la construcción de partenariados con el sector privado puede dar para lograr el desarrollo del sector agopecuario en términos de desarrollo humano y sostenible. Pese a lo innovador del instrumento – partenariados publico-privados (ppps) en el sector de la agricultura – el trabajo no pretende responder a la pregunta inicial, sino hacer una revisión del estado de la situación y averiguar qué se ha dicho al respecto, tanto en la construcción de ppps como en las inversiones privadas en agricultura, para poder así entender el contexto y las posibilidades de desarrollo. Finalmente, el trabajo hace una propuesta de estudio de casos basado en la iniciativa grow África, para una posible futura investigación.

Energy-driven subunit rotation at the interface between subunit a and the c oligomer in the FO sector of Escherichia coli ATP synthase

Subunit rotation within the F1 catalytic sector of the ATP synthase has been well documented, identifying the synthase as the smallest known rotary motor. In the membrane-embedded FO sector, it is thought that proton transport occurs at a rotor/stator interface between the oligomeric ring of c subunits (rotor) and the single-copy a subunit (stator). Here we report evidence for an energy-dependent rotation at this interface. FOF1 was expressed with a pair of substituted cysteines positioned to allow an intersubunit disulfide crosslink between subunit a and a c subunit [aN214C/cM65C; Jiang, W. & Fillingame, R. H. (1998) Proc. Natl. Acad. Sci. USA 95, 6607–6612]. Membranes were treated with N,N′-dicyclohexyl-[14C]carbodiimide to radiolabel the D61 residue on less than 20% of the c subunits. After oxidation to form an a–c crosslink, the c subunit properly aligned to crosslink to subunit a was found to contain very little 14C label relative to other members of the c ring. However, exposure to MgATP before oxidation significantly increased the radiolabel in the a–c crosslink, indicating that a different c subunit was now aligned with subunit a. This increase was not induced by exposure to MgADP/Pi. Furthermore, preincubation with MgADP and azide to inhibit F1 or with high concentrations of N,N′-dicyclohexylcarbodiimide to label most c subunits prevented the ATP effect. These results provide evidence for an energy-dependent rotation of the c ring relative to subunit a.

Safeguarding the EDTIB: the Case for Supervising non-EU FDI in the Defence Sector. Security Policy Brief No. 41, December 2012

It is time for the EU member states to start collectively supervising non-EU FDI in Europe’s defence industries and infrastructures. This should be a prudent element of the nascent EDTIB and a way to maintain European security by encouraging greater coordination between the national supervisory frameworks.