Electrolyzer-powered flame ionization detector

We describe here a novel water electrolyzer-powered name ionization detector (EFID), characterized by enhanced portability, reduced cost of operation and improved safety of operation and storage, A conventional FID operates with a hydrogen diffusion name, which has a central now of pure hydrogen and column effluents, surrounded by a much higher coaxial now of pure air, In contrast, the EFID is based on the combustion of a premixed (unseparated), hydrogen and oxygen, stoichiometric gas mixture, ?his premixed gas mixture is provided by a simple water electrolyzer with low power and water cons

An in situ tensile test apparatus for polymers in high pressure hydrogen

Degradation of material properties by high-pressure hydrogen is an important factor in determining the safety and reliability of materials used in high-pressure hydrogen storage and delivery. Hydrogen damage mechanisms have a time dependence that is linked to hydrogen outgassing after exposure to the hydrogen atmosphere that makes ex situ measurements of mechanical properties problematic. Designing in situ measurement instruments for high-pressure hydrogen is challenging due to known hydrogen incompatibility with many metals and standard high-power motor materials such as Nd.

Accident modelling and safety measure design of a hydrogen station

An accident modelling approach is used to assess the safety of a hydrogen station as part of a ground transportation network. The method incorporates prevention barriers associated to human factors, management and organizational failures in a risk assessment framework. Failure probabilities of these barriers and end-states events are predicted using Fault Tree Analysis and Event Tree Analysis respectively. Results from the case study considered revealed the capability of the proposed method in estimating the likelihood of various outcomes as well as predicting their future probabilities.

Hydrogen supply chain optimization for deployment scenarios in the Midi-Pyrenees region, France

Several roadmaps and international projects are interested in the development of the hydrogen economy for the transportation system. Yet, the development of a hydrogen economy suffers from a lack of infrastructure to store and supply H-2 fuel to the refuelling stations, while at the same time, hydrogen can be just seen as one alternative among others to compete with the current fossil fuels. To determine if hydrogen is a competitive option, many scenarios must be assessed considering not only the cost as the target to determine the feasibility but, also environmental and safety objectives.

Assigning priorities to actions in a pipeline transporting hydrogen based on a multicriteria decision model

Nowadays there is a pressing need to implement changes in the global energy structure, such that it incorporates new features and changes the way that we use fossil fuels. In this scenario, hydrogen is projected as the fuel of the future. Among the possible modes that can be used for its transportation, the pipeline is singled out as it is the safest and the most economically viable means of transporting large quantities of the gas. However, accidents to pipelines have been recorded and they often result in catastrophic consequences for society.

A novel application of high-dose (50 kGy) gamma irradiation for demineralized bone matrix: effects on fusion rate in a rat spinal fusion model

{BACKGROUND CONTEXT: The safety of allograft material has come under scrutiny because of recent reports of allograft-associated bacterial and viral infections in tissue recipients. Gamma irradiation, although being one of the most effective ways of terminal sterilization, has been shown to affect the biomechanical properties of allograft bone. It may also have detrimental effects on the osteoinductivity of allograft material such as demineralized bone matrix (DBM) by the denaturation of proteins because of heat generated by irradiation.

Safety study of a hydrogen leak in a fuel cell vehicle using computational fluid dynamics

This paper analyzes safety aspects inside a Fuel Cell vehicle using Computational Fluid Dynamics (CFD) tools. The research considers an introduction of a leak of hydrogen inside the vehicle, and its dispersion for a set of typical ventilation conditions is analyzed. The leak of hydrogen has been modelled according to the properties of hydrogen and depending on the pressure difference between the hydrogen storage tank (200 bar) and the atmosphere. The parameters considered for the simulations are the flow rate of cabin ventilation air and hydrogen's leak.

Modulation of genotoxicity by extra-virgin olive oil and some of its distinctive components assessed by use of the Drosophila wing-spot test

Olive oil is an important source of mono-unsaturated fat and a prime component of the Mediterranean diet. The beneficial health effects of olive oil are due to both its high content of mono-unsaturated fatty acids and its high content of anti-oxidative substances. The objective of this study was to investigate the basis for the epidemiological information relating to the health benefits associated with the consumption of extra-virgin olive oil (EVOO).

Modeling of hydrogen explosion on a pressure swing adsorption facility

Computational fluid dynamic simulations have been performed in order to study the consequences of a hydrogen release from a pressure swing adsorption installation operating at 30 barg. The simulations were performed using FLACS-Hydrogen software from GexCon. The impact of obstruction, partial confinement, leak orientation and wind on the explosive cloud formation (size and explosive mass) and on explosion consequences is investigated. Overpressures resulting from ignition are calculated as a function of the time to ignition. Crown Copyright (C) 2013, Hydrogen Energy Publications, LLC.

Steam oxidation of PFC materials for advanced tokamaks

Steam chemical reactivity experiments were conducted for several ITER-like tokamak plasma-facing-component (PFC) materials: NB31 and NS31 carbon fiber composites (CFCs), W-1%2a, DShG-200 Be, and Be.(S65C and-Ka-wecki PO Ductile Be) specimens irradiated to fast neutron fluences ranging from 5 x 10(19) to 1 x 10(21) n/cm(2). Experiments were performed at 800-1100 degreesC for CFC, 550-1000 degreesC for W-1%2a, 500-900 degreesC for unirradiated Be, and 600-800 degreesC for irradiated Be.

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