Search results for "Fuel Technology"

Coating Evaporated MAPI Thin Films with Organic Molecules: Improved Stability at High Temperature and Implementation in High-Efficiency Solar Cells

2018

Methylammonium lead iodide (MAPI) has proven to be an exceptional light-absorber for single-junction thin-film solar cells. Nonetheless, degradation induced by environmental agents (air, moisture, heat) limits the stability of this hybrid perovskite. Here, we demonstrate that coating evaporated MAPI thin films with different hydrophobic molecules leads to a significant improvement in their stability. We especially investigated the degradation of MAPI and the subsequent formation of PbI2 at 150 °C by in situ XRD analysis and showed that this transformation is remarkably slowed down in films coated with trioctyl phosphine oxide and tridodecyl methylammonium iodide. This enhances the processab…

Safety studies of a hydrogen refuelling station: Determination of the occurrence frequency of the accidental scenarios

2009

At present, the hydrogen vehicles technology appears to have future Prospective for reduction in greenhouse gas emissions. Nevertheless, the development of such a technology requires appropriate infrastructures for production, Storage and refuelling stages in a refuelling station. This one presents safety challenges due to the hydrogen chemicophysical characteristics. So, to avoid hazards, it is necessary to implement safety practices that, if early adopted in the development of a fuelling station project, can allow very low impact, safety being incorporated in the project itself. However, a drawback is the not sufficient experience and the scarcity of the relevant data collection. To deepe…

Development and validation of a 5 stroke engine for range extenders application

2014

International audience; A 5-stroke turbo-charged port-injection spark-ignition engine has been developed in the present study for use as a range extender or series-hybrid main power source. The development and the design of the engine are based on 0D/1D model and experimental results have been compared with the engine model. The 5-stroke engine is a three-cylinder in which two cylinders perform a four-stroke cycle and alternatively a second expansion of the burnt gases is performed in the third cylinder. The boost pressure delivered by the turbocharger is controlled by a particular innovative system called “smart wastegate”, different from a conventional wastegate, consisting in a variable …

Conversion of peat and coal nitrogen through HCN and NH3 to nitrogen oxides at 800 °C

1993

The conversion of fuel nitrogen through HCN and NH3 to nitrogen oxides (N2O, NO and NO2) was studied using an entrained-flow reactor at 800 °C with one coal and four peats at 5 and 1% O2. The ON ratios of the fuels were between 7 and 20. A clear dependence was found between the HCNNH3 ratio measured just after the vigorous pyrolysis step and the N2ONO ratio in the flue gas when these were plotted as a function of the initial ON ratio of the fuel.

Towards controlling PCDD/F production in a multi-fuel fired BFB boiler using two sulfur addition strategies. Part I: Experimental campaign and results

2014

Abstract Levels of PCDD/F production in a 140 MW th bubbling fluidized bed boiler were measured. The boiler uses solid recovered fuel, bark and sludge. Homologue distribution patterns suggest the de novo mechanism is the main pathway for the generation of dioxin and furans in the post combustion zones of the boiler. Two modes of sulfur addition were tested to induce the deactivation of Cu which has been identified as the prime catalyst of this mechanism. First, S-pellet promoted Cu sulfation as supported by aerosol sampling data and resulted in a decrease in PCDD/F levels. The second approach was adding sulfur through peat; this resulted in an increase in PCDD/F concentration. Factors such …

DC/DC converter topologies for electrolyzers: State-of-the-art and remaining key issues.

2017

In recent years, the use of electrolyzers to produce cleanly and efficiently hydrogen from renewable energy sources (i.e. wind turbines, photovoltaic) has taken advantage of a growing interest from researchers and industrial. Similarly to fuel cells, DC/DC converters are needed to interface the DC bus with the electrolyzer. Usually, electrolyzers require a low DC voltage to produce hydrogen from water. For this reason, a DC/DC buck converter is generally used for this purpose. However, other DC/DC converter topologies can be used depending on the feature of the electrolyzer and electrical grid as well. The main purpose of this paper is to present the current state-of-the-art of DC/DC conver…

Atrofia muscular espinal y bulbar Enfermedad de Kennedy. Aspectos clínicos y genéticos

2019

La atrofia muscular espinal y bulbar es una enfermedad neurologica caracterizada por degeneracion gradual de la motoneurona inferior, que resulta en debilidad muscular, atrofia y fasciculaciones. Es una entidad de etiologia genetica con mecanismo de herencia ligado al cromosoma X recesivo, por lo que afecta a varones, en la que se produce una expansion del triplete CAGn en el gen del receptor de androgenos. Se manifiesta por signos de insensibilidad a los androgenos (ginecomastia e infertilidad). A partir de los 20-30 anos, aproximadamente, comienzan los signos de afectacion de la motoneurona inferior a nivel espinal con calambres y temblor de accion y posteriormente debilidad muscular. En …

“ABORDAJES. SOBRE COMUNICACIÓN Y CULTURA”

2020

“IMÁGENES DESCARNADAS. CUERPO, POLÍTICA E IMAGINACIÓN”

2020

Video Art by Mexican Women Artists in the 21st Century. Context and Dissemination

2015

The new art history arises, from an interdisciplinary view, theoretical and practical embodiment issues related with contemporary art and its inclusion and development in university world. At the same time,gender studies have been incorporated into the development of postgraduate curriculum, placing value on the art work of women, continuing the contestation to the canon already started in the twentieth century. These gender discourses have assumed new technologies as the most versatile media format with unlimited field for image dissemination. Consequently, in the context of globalization, the intangible and digitalformats have become priority means when developing feminist and post-femini…