An alternative disjunctive optimization model for heat integration with variable temperatures

This paper presents an alternative model to deal with the problem of optimal energy consumption minimization of non-isothermal systems with variable inlet and outlet temperatures. The model is based on an implicit temperature ordering and the “transshipment model” proposed by Papoulias and Grossmann (1983). It is supplemented with a set of logical relationships related to the relative position of the inlet temperatures of process streams and the dynamic temperature intervals. In the extreme situation of fixed inlet and outlet temperatures, the model reduces to the “transshipment model”. Several examples with fixed and variable temperatures are presented to illustrate the model's performance.

La sexualidad como variable importante en la calidad de vida (C.V) de las personas con discapacidad

La afectividad y la sexualidad se han de desarrollar adecuadamente en los individuos aunque no estén en plenas condiciones físicas y psíquicas, indiferentemente si residen en su domicilio o en un centro especializado. La atención a la discapacidad no siempre ha estado ligada al concepto de cuidados de enfermería, pero en la actualidad se considera indispensable hacerlo desde la defensa de los derechos de las personas con Diversidad Funcional (D.F.), ratificados en la Convención de Ginebra de 2008. En este trabajo se presentan datos que forma parte de una tesis doctoral en la que se estudia las alteraciones de la sexualidad en personas con D.F. y como ésta influye en su calidad de vida (CV); Planteado desde el marco enfermero de los Patrones Funcionales de Marjory Gordon, por visualizar los procesos vitales siempre desde una visión integral de salud, guiando de forma lógica al diagnóstico enfermero, contemplando al paciente desde una visión holística y recogiendo toda la información necesaria del paciente, familia y entorno incluyendo su sexualidad.

The outburst decay of the low magnetic field magnetar SWIFT J1822.3−1606: phase-resolved analysis and evidence for a variable cyclotron feature

We study the timing and spectral properties of the low-magnetic field, transient magnetar SWIFT J1822.3−1606 as it approached quiescence. We coherently phase-connect the observations over a time-span of ∼500 d since the discovery of SWIFT J1822.3−1606 following the Swift-Burst Alert Telescope (BAT) trigger on 2011 July 14, and carried out a detailed pulse phase spectroscopy along the outburst decay. We follow the spectral evolution of different pulse phase intervals and find a phase and energy-variable spectral feature, which we interpret as proton cyclotron resonant scattering of soft photon from currents circulating in a strong (≳1014 G) small-scale component of the magnetic field near the neutron star surface, superimposed to the much weaker (∼3 × 1013 G) magnetic field. We discuss also the implications of the pulse-resolved spectral analysis for the emission regions on the surface of the cooling magnetar.

Cálculo del asiento elástico tridimensional de cimentaciones de rigidez variable en terrenos con una capa rígida inclinada

Las fórmulas basadas en la teoría de la elasticidad son ampliamente utilizadas para el cálculo de asientos de cimentaciones, ya que la totalidad de la normativa geotécnica recomienda su empleo. No obstante, estos métodos no cubren todas las situaciones geotécnicamente posibles ya que frecuentemente las condiciones geológicas son complejas. En este trabajo se analiza la influencia de la presencia de una capa rígida inclinada en los asientos elásticos de una cimentación superficial. Para ello se han resuelto 273 modelos tridimensionales no lineales de elementos finitos, variando los parámetros clave del problema: la inclinación y la profundidad de la capa rígida y la rigidez de la cimentación. Finalmente, se ha realizado un análisis estadístico de los resultados de los modelos y se ha propuesto una fórmula que puede ser utilizada en el cálculo de asientos por métodos elásticos, para tener en consideración la presencia de una capa rígida inclinada en profundidad.

Discussions in Europe on Variable Compensation in the Financial Sector. EU Centre Singapore Working Paper no. 20, February 2014

Bonuses – which are often used to mitigate principal-agent problems and to encourage employees to work harder – have increased tremendously in the financial sector during the last decade, and have often been seen as a contributing factor to the financial crisis of 2008. The recent European Union (EU) action to adopt a policy that restricts bonuses paid to bankers may seem promising at first, but this does not address the real issues behind variable rewards. Compensation policies should be changed to encourage responsible risk-taking and decision-making through the implementation of broader performance metrics, forfeitable holdbacks and hybrid bonds. Furthermore, a change in organisational culture is needed to improve ethical behaviour leading to a re-balancing of stakeholders’ interests in the financial sector.

System Costs of Variable Renewable Energy in the European Union. Bruges European Economic Policy (BEEP) Briefings 37/2015

To shift to a low-carbon economy, the EU has been encouraging the deployment of variable renewable energy sources (VRE). However, VRE lack of competitiveness and their technical specificities have substantially raised the cost of the transition. Economic evaluations show that VRE life-cycle costs of electricity generation are still today higher than those of conventional thermal power plants. Member States have consequently adopted dedicated policies to support them. In addition, Ueckerdt et al. (2013) show that when integrated to the power system, VRE induce supplementary not-accounted-for costs. This paper first exposes the rationale of EU renewables goals, the EU targets and current deployment. It then explains why the LCOE metric is not appropriate to compute VRE costs by describing integration costs, their magnitude and their implications. Finally, it analyses the consequences for the power system and policy options. The paper shows that the EU has greatly underestimated VRE direct and indirect costs and that policymakers have failed to take into account the burden caused by renewable energy and the return of State support policies. Indeed, induced market distortions have been shattering the whole power system and have undermined competition in the Internal Energy Market. EU policymakers can nonetheless take full account of this negative trend and reverse it by relying on competition rules, setting-up a framework to collect robust EU-wide data, redesigning the architecture of the electricity system and relying on EU regulators.

Algorithm for Estimation of Electricity Consumption Reduction by Using Variable Frequency Drive of Main Line Pumps

The article is about using of variable frequency drives for reduction oil pumping main line pumps energy consumption. Block diagram of developed computer program is shown in the article. The computer program allows to determine the reduction of energy consumption and to estimate payback period of variable frequency drives.

The cluster variable RR Lyrae.

Signed: C.C. Kiess.

Performance characteristics of automotive engines in the United States. First series--report no. 20. 1975 Chevrolet 350 CID (5.7 liters) with Dresser variable - area Venturi system. Interim report.

Transportation Systems Center, Cambridge, Mass.

The theory of functions of a complex variable. [Lectures] New York University, Institute for Mathematics and Mechanics.

"First edition 1948. Second printing 1952."

Variable stars in Milton field 54,

Mode of access: Internet.

Variable stars,

"Corrections to index": slip laid in.

Theory of functions of a real variable.

Mode of access: Internet.

Functions of real variables. Functions of a complex variable.

Mode of access: Internet.