Control Room Requirements for Voltage Control in Future Power Systems

In future power grids, a large integration of renewable energy sources is foreseen, which will impose serious technical challenges to system operators. To mitigate some of the problems that renewable energy sources may bring, new voltage and frequency control strategies must be developed. Given the expected evolution of technologies and information systems, these new strategies will benefit from increasing system observability and resources controllability, enabling a more efficient grid operation. The ELECTRA IRP project addressed the new challenges that future power systems will face and developed new grid management and control functionalities to overcome the identified problems. This work, implemented in the framework of ELECTRA, presents an innovative functionality for the control room of the cell operator and its application in assistance with the voltage control designed for the Web-of-Cells. The voltage control method developed uses a proactive mode to calculate the set-points to be sent to the flexible resources, each minute, for a following 15-min period. This way, the voltage control method developed is able to mitigate voltage problems that may occur, while, at the same time, contributes to reduce the energy losses. To enable a straightforward utilization of this functionality, a user interface was created for system operators so they can observe the network state and control resources in a forthright manner accordingly.The work presented in this paper was funded by the ELECTRA IRP project (Seventh Framework Programme FP7 2007/2013) under grant agreement No. 609687

Using mobility information to perform a feasibility study and the evaluation of spatio-temporal energy demanded by an electric taxi fleet

Half of the global population already lives in urban areas, facing to the problem of air pollution mainly caused by the transportation system. The recently worsening of urban air quality has a direct impact on the human health. Replacing today’s internal combustion engine vehicles with electric ones in public fleets could provide a deep impact on the air quality in the cities. In this paper, real mobility information is used as decision support for the taxi fleet manager to promote the adoption of electric taxi cabs in the city of San Francisco, USA. Firstly, mobility characteristics and energy requirements of a single taxi are analyzed. Then, the results are generalized to all vehicles from the taxi fleet. An electrificability rate of the taxi fleet is generated, providing information about the number of current trips that could be performed by electric taxis without modifying the current driver mobility patterns. The analysis results reveal that 75.2% of the current taxis could be replaced by electric vehicles, considering a current standard battery capacity (24–30 kWh). This value can increase significantly (to 100%), taking into account the evolution of the price and capacity of the batteries installed in the last models of electric vehicles that are coming to the market. The economic analysis shows that the purchasing costs of an electric taxi are bigger than conventional one. However, fuel, maintenance and repair costs are much lower. Using the expected energy consumption information evaluated in this study, the total spatio-temporal demand of electric energy required to recharge the electric fleet is also calculated, allowing identifying optimal location of charging infrastructure based on realistic routing patterns. This information could also be used by the distribution system operator to identify possible reinforcement actions in the electric grid in order to promote introducing electric vehicles

Decavanadate induces mitochondrial membrane depolarization and inhibits oxygen consumption

Decavanadate induced rat liver mitochondrial depolarization at very low concentrations, half-depolarization with 39 nM decavanadate, while it was needed a 130-fold higher concentration of monomeric vanadate (5 lM) to induce the same effect. Decavanadate also inhibits mitochondrial repolarization induced by reduced glutathione in vitro, with an inhibition constant of 1 lM, whereas no effect was observed up to 100 lM of monomeric vanadate. The oxygen consumption by mitochondria is also inhibited by lower decavanadate than monomeric vanadate concentrations, i.e. 50% inhibition is attained with 99 nM decavanadate and 10 lM monomeric vanadate. Thus, decavanadate is stronger as mitochondrial depolarization agent than as inhibitor of mitochondrial oxygen consumption. Up to 5 lM, decavanadate does not alter mitochondrial NADH levels nor inhibit neither FOF1-ATPase nor cytochrome c oxidase activity, but it induces changes in the redox steady-state of mitochondrial b-type cytochromes (complex III). NMR spectra showed that decameric vanadate is the predominant vanadate species in decavanadate solutions. It is concluded that decavanadate is much more potent mitochondrial depolarization agent and a more potent inhibitor of mitochondrial oxygen consumption than monomeric vanadate, pointing out the importance to take into account the contribution of higher oligomeric species of vanadium for the biological effects of vanadate solutions

Decavanadate toxicity effects following in vivo administration

Very few in vivo animal studies involving vanadium consider the contribution of decavanadate (V10) to vanadium biological effects. Recently, it is been suggested that decameric vanadate may not completely fall apart into other vanadate oligomers before induces changes in cell homeostasis, namely in several stress markers. An acute exposure of different fish species (Halobactrachus didactilus, Lusitanian toadfish, and Sparus aurata, gilthead seabream) to decavanadate, but not to other vanadate oligomers, induced different effects than vanadate in catalase activity, glutathione content, lipid peroxidation, mitochondrial superoxide anion production and vanadium accumulation, whereas both solutions seem to equally depress reactive oxygen species (ROS) production as well as total intracellular reducing power. Vanadium is accumulated in Sparus aurata mitochondria in particular when decavanadate is administrated. Moreover, exposure to different vanadate oligomers induced morphological changes in fish cardiac, hepatic and renal tissues causing tissues lesions in the liver and kidney, but not cardiac tissue. Nevertheless, the results highlight that different vanadate oligomers seem to follow, not only in vitro but also in vivo, different pathways, with different targets and effects. These recent findings, that are now summarized, point out the decameric vanadate species contributions to in vivo effects induced by vanadium in biological systems

The Cape Verde Archipelago and the Protection of Sea Turtles

[Resumo] As tartarugas marinhas são espécies mundialmente protegidas; são populações emigrantes presentes em todo o mundo, tamén en Cabo Verde. Presentase un estudo que tinha como objectivos conhecer a existência de tartarugas marinhas en Cabo Verde, identificar as espécies mais frequentes e as praias e as zonas de maior ocorrência, e os maiores perigos que enfrentam. O estudo contempla tamén a contribuição social, económica e cultural das tartarugas marinhas para o desenvolvimento das populações locais, e unha campaña de comunicação social[Abstract] Sea turtles are species which are protected throughout the world, they are emigrant populations which are present throughout the world, and also in Cape Verde. We present a study which has as its objectives some knowledge of the existence of sea turtles in Cape Verde, the identification of the most frequently spotted species and the beaches and areas in which these are most common, and the major dangers which they face. This study also contemplates the social, economic and cultural contribution of sea turtles in the development of the local populations along with a campaign of social communication

Estimulación basal y multisensorial en niños plurideficientes. Propuesta de actividades

Con este proyecto que presento a continuación quiero transmitir la importancia de la estimulación basal y multisensorial en personas plurideficientes actuando desde su forma de intervención: la captación de estímulos a través de la percepción y la estimulación creando unas respuestas en el niño. En el marco teórico del proyecto también ponemos de manifiesto los lugares, materiales y actividades idóneos a la hora de trabajar la estimulación con niños plurideficientes. Para ello creamos una guía de actividades la cuál va orientada según las áreas de percepción que tenemos que estimular en el niño.Grado en Educación Primari

Job-posting: ¿Qué elementos del anuncio de empleo influyen en la decisión de solicitar el puesto?

Trabajo de Fin de Máster en Organización del Trabajo y Gestión de Recursos HumanosLa atracción y captación de talento por parte de las organizaciones mediante anuncios de empleo en portales digitales, es un problema común a diversos sectores profesionales. Sin embargo, no se ha desarrollado suficiente investigación respecto a qué factores de un anuncio de empleo pueden influir en mayor medida sobre dicho problema. En el presente trabajo se analiza, mediante dos estudios complementarios, de carácter exploratorio y experimental respectivamente, la relación entre las variables aspecto estético y contenido y el interés del candidato en el puesto, así como su intención de inscribirse en la oferta. Los resultados obtenidos arrojan evidencia de cierta relación entre dichas variables en diferente medida. No obstante, estas conclusiones no se deben generalizar, dadas las limitaciones del estudioOrganizations’ attempts to attract and recruit talent through job postings is a common practice in different professional areas. Despite that, not enough investigation on which factors could affect this practice has been made yet. The present study analyses through two complementary studies, of both exploratory and experimental characteristics each one, the relation between variables aesthetics and content and the candidates’ interest on the job offer, as well as their intention to apply for this job. Results show evidence of certain relation between these variables to varying degrees. However, these conclusions can not be generalized, due to the limits of this stud

Hormone deprivation alters mitochondrial function and lipid profile in the hippocampus

Mitochondrial dysfunction is a common hallmark in aging. In the female, reproductive senescence is characterized by loss of ovarian hormones, many of whose neuroprotective effects converge upon mitochondria. The functional integrity of mitochondria is dependent on membrane fatty acid and phospholipid composition, which are also affected during aging. The effect of long-term ovarian hormone deprivation upon mitochondrial function and its putative association with changes in mitochondrial membrane lipid profile in the hippocampus, an area primarily affected during aging and highly responsive to ovarian hormones, is unknown. To this aim, Wistar adult female rats were ovariectomized or sham-operated. Twelve weeks later, different parameters of mitochondrial function (O2 uptake, ATP production, membrane potential and respiratory complex activities) as well as membrane phospholipid content and composition were evaluated in hippocampal mitochondria. Chronic ovariectomy reduced mitochondrial O2 uptake and ATP production rates and induced membrane depolarization during active respiration without altering the activity of respiratory complexes. Mitochondrial membrane lipid profile showed no changes in cholesterol levels but higher levels of unsaturated fatty acids and a higher peroxidizability index in mitochondria from ovariectomized rats. Interestingly, ovariectomy also reduced cardiolipin content and altered cardiolipin fatty acid profile leading to a lower peroxidizability index. In conclusion, chronic ovarian hormone deprivation induces mitochondrial dysfunction and changes in the mitochondrial membrane lipid profile comparable to an aging phenotype. Our study provides insights into ovarian hormone loss-induced early lipidomic changes with bioenergetic deficits in the hippocampus that may contribute to the increased risk of Alzheimer’s disease and other age-associated disorders observed in postmenopause.Fil: Zarate, Sandra Cristina. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Houssay. Instituto de Investigaciones Biomédicas. Universidad de Buenos Aires. Facultad de Medicina. Instituto de Investigaciones Biomédicas; ArgentinaFil: Astiz, Mariana. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Investigaciones Bioquímicas de La Plata "Prof. Dr. Rodolfo R. Brenner". Universidad Nacional de la Plata. Facultad de Ciencias Médicas. Instituto de Investigaciones Bioquímicas de La Plata ; ArgentinaFil: Magnani, Natalia Daniela. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Houssay. Instituto de Bioquímica y Medicina Molecular. Universidad de Buenos Aires. Facultad Medicina. Instituto de Bioquímica y Medicina Molecular; ArgentinaFil: Imsen, Mercedes. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Houssay. Instituto de Investigaciones Biomédicas. Universidad de Buenos Aires. Facultad de Medicina. Instituto de Investigaciones Biomédicas; ArgentinaFil: Merino, Florencia. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Houssay. Instituto de Investigaciones Biomédicas. Universidad de Buenos Aires. Facultad de Medicina. Instituto de Investigaciones Biomédicas; ArgentinaFil: Alvarez, Silvia. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Houssay. Instituto de Bioquímica y Medicina Molecular. Universidad de Buenos Aires. Facultad Medicina. Instituto de Bioquímica y Medicina Molecular; ArgentinaFil: Reines, Analia Gabriela. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Houssay. Instituto de Biología Celular y Neurociencia "Prof. Eduardo de Robertis". Universidad de Buenos Aires. Facultad de Medicina. Instituto de Biología Celular y Neurociencia; ArgentinaFil: Seilicovich, Adriana. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Houssay. Instituto de Investigaciones Biomédicas. Universidad de Buenos Aires. Facultad de Medicina. Instituto de Investigaciones Biomédicas; Argentin

Titulación de activos como alternativa de financiamiento en la empresa Casa Grande S.A.A. 2015

El presente trabajo de investigación denominado “ Titulización de Activos como alternativa de financiamiento en la empresa CASA GRANDE S.A.A. 2015” se desarrolló bajo normas reglamentarias normas de información financiera (NIIF’S) que regulan la problemática financiera de la empresa CASA GRANDE S.A.A., la cual se encontró en la necesidad de adquirir financiamiento para hacer frente a sus diversas necesidades financieras con el fin de implementar su planta de producción ya que CASA GRANDE S.A.A., tiene un aumento de producción en los sucesivos 5 años. Por lo que se propuso a CASA GRANDE S.A.A., aplicar la Titulización de Activos como alternativa de financiamiento ya que es ventajoso para la empresa. Así mismo de acuerdo al análisis de la información financiera que se realizó a CASA GRANDE S.A.A., esta cumple con los requisitos y características que demanda el financiamiento a través de Titulización de Activos. Siendo así CASA GRANDE S.A.A., aplico la Titulización de sus flujos futuros producto de las ventas futuras, así como también se realizó la estructuración del proceso y se explicó la función de los sujetos intervinientes en dicho proceso.Trabajo de suficiencia profesionalCampus Lima Centr