Search results for "g(1)"
showing 10 items of 717 documents
Forecasting Weekly Electricity Prices at Nord Pool
2007
This paper analyses the forecasting power of weekly futures prices at Nord Pool. The forecasting power of futures prices is compared to an ARIMAX model of the spot price. The time series model contains lagged external variables such as: temperature, precipitation, reservoir levels and the basis (futures price less the spot price); and generally reflects the typical seasonal patterns in weekly spot prices. Results show that the time series model forecasts significantly beat futures prices when using the Diebold and Mariano (1995) test. Furthermore, the average forecasting error of futures prices reveals that they are significantly above the settlement spot price at the ‘delivery week’ and th…
TGF-beta as a T cell regulator in colitis and colon cancer
2005
TGF-beta is a pleiotropic cytokine with powerful immunosuppressive functions. Mice deficient for TGF-beta1 show a dramatic phenotype with severe multiorgan inflammation and die shortly after birth. Recent investigations have highlighted the role of TGF-beta in suppression of T cell mediated autoimmune inflammation and anti-tumor immunity. In addition to its direct anti-inflammatory effects on T cells, TGF-beta has been implicated as central regulator of regulatory T cells. TGF-beta not only mediates the suppression of effector T cells by Tregs, recent evidence also reveals a role for TGF-beta along with TCR stimulation in the peripheral induction of regulatory T cells from naïve CD4+CD25- c…
Differential regulation of endothelial cell adhesion molecule expression by nitric oxide donors and antioxidants.
1998
Although nitric oxide (NO) and antioxidants inhibit adhesion molecule expression, their inhibitory effects on nuclear factor kappaB (NF-kappaB) activation may differ. The NO donors, but not 8-bromo-cGMP, decreased tumor necrosis factor alpha (TNF-alpha)-induced VCAM-1, ICAM-1, and E-selectin expression by 11-70%. In contrast, NAC completely abolished VCAM-1 and E-selectin expression and decreased ICAM-1 expression by 56%. Gel shift assays demonstrate that NF-kappaB activation was inhibited by both NO and antioxidants. The activation of NF-kappaB involves the phosphorylation and degradation of its cytoplasmic inhibitor IkappaB-alpha by 26S proteasomes. The 26S proteasome inhibitor MG132 prev…
A Mixed Approach for Determination of Initial Cable Forces in Cable-Stayed Bridges and the Parameters Variability
2015
The determination of initial cable forces in cable-stayed bridges is an important first step in design and analysis of the structure under external loads. Adjustments of stay forces are often required during construction in order to assure the requested behaviour of the bridge in terms of final geometrical configuration and internal force distribution. An accurate assessment of the stay tensioning system allows designers to obtain a good result at the end of construction, by considering the parameters involved as deterministic quantities, assuring the observance of the execution tolerances during works. Actual loads and their variations need instead a stochastic approach which can give usef…
Evaluation of the Safety Performance of Turbo Roundabouts by Means of a Potential Accident Rate Mode
2015
Turbo roundabouts are a particular road intersection layout, designed to increase the safety of double-lane roundabouts, while maintaining their excellent capacity. The main feature of this new concept of roundabout is the impossibility to move from one lane to another, provided by physical barriers marking the lanes. The paper shows an application to turbo roundabouts of a potential accident rate model, aiming to evaluate their safety improvement. Themodel is based on the concept of potential conflict: each vehicle involved in a general intersection performs a series of maneuvers which potentially imply a crash, according to the actual traffic. The number of accidents related to each criti…
North American entrepreneurs in Cuba: which entry mode and government affiliation strategy?
2018
Purpose To have success in newly liberalized markets, firms must have a plan of action before resources are committed. What some companies do not realize is that their own entrepreneurial orientation (EO) will dictate their strategies, and performance outcomes, in both their home market and abroad. In order to maximize firm performance in newly liberalized markets (such as Cuba), firms must be able to objectively gauge their own EO. The paper aims to discuss these issues. Design/methodology/approach Within this framework, the present paper will attempt to effectively measure the EO of decision-making managers from US companies that have an interest in entering the Cuban market. A final sam…
SUSTENTABILIDADE AMBIENTAL: UM ESTUDO NA AUTORIDADE PORTUÁRIA DE VALENCIA, ESPANHA.
2012
Mesmo com a grande relevância dos portos para o desenvolvimento econômico e social dos países, há uma questão que merece atenção dos gestores e da sociedade, é o fato que as atividades portuárias causam impactos ambientais, tais como assoreamento em meios aquáticos, alterações na fauna e flora, emissões atmosféricas, geração de resíduos sólidos, entre outros. Neste contexto, a gestão da informação ambiental é importante tanto para os gestores dos portos quanto para a sociedade, pois permite conhecer o nível de impacto gerado e o n&ia…
Innovación y actores locales en los nuevos espacios económicos: Un estado de la cuestión
2003
El estudio de los procesos de innovación en los nuevos espacios económicos caracterizados por la aglomeración de actividades productivas especializadas y estrechas relaciones de colaboración/competencia entre agentes (distritos industriales, sistemas productivos locales, medios innovadores, etc.) es un ejemplo del «giro» relacional que se ha producido en la geografía económica desde los años 1990. El presente artículo repasa algunas de las principales características del estudio de los denominados «sistemas territoriales de innovación», centrándose especialmente en el análisis de algunas cuestiones que están sujetas a debate y en los problemas metodológicos que se derivan de la nueva perspe…
El litoral turístico valenciano. Intereses y controversias en un territorio tensionado por el residencialismo
2011
El artículo quiere analizar, valorar y comprender el fortísimo oleaje inmobiliario que ha conocido el litoral valenciano en los últimos años (1998-2008) y sus repercusiones sobre el territorio turístico. Importará, desde el análisis geográfico, acercarse al planteamiento territorial y político, en sus vertientes urbanísticas y turísticas, así como a los procesos y estrategias de cambio en los destinos, sean estos manifiestamente turísticos o relevantemente residenciales. Se pretende también cuantificar a escala municipal el impacto de dicha explosión inmobiliaria-residencial y, por supuesto, incidir objetivamente en las controversias derivadas del llamado «milagro económico valenciano».
Volatility transmission patterns and terrorist attacks
2009
The objective of this study is to analyze volatility transmission between the US and Eurozone stock markets considering the effects of the September 11, March 11 and July 7 financial crises. In order to do this, we use a multivariate GARCH model and take into account the asymmetric volatility phenomenon, the non-synchronous trading problem and the crises themselves. Moreover, a graphical analysis of the Asymmetric Volatility Impulse-Response Functions (AVIRF) is introduced, which takes into consideration the crisis effect. Results suggest that there is bidirectional and asymmetric volatility transmission and show the different impact that terrorist attacks had on both markets. El objetivo d…