A Lexicalized Tree-Adjoining Grammar for Vietnamese

In this paper, we present the first sizable grammar built for Vietnamese using LTAG, developed over the past two years, named vnLTAG. This grammar aims at modelling written language and is general enough to be both application- and domain-independent. It can be used for the morpho-syntactic tagging and syntactic parsing of Vietnamese texts, as well as text generation. We then present a robust parsing scheme using vnLTAG and a parser for the grammar. We finish with an evaluation using a test suite

A Lexicalized Tree-Adjoining Grammar for Vietnamese

In this paper, we present the first sizable grammar built for Vietnamese using LTAG, developed over the past two years, named vnLTAG. This grammar aims at modelling written language and is general enough to be both application- and domain-independent. It can be used for the morpho-syntactic tagging and syntactic parsing of Vietnamese texts, as well as text generation. We then present a robust parsing scheme using vnLTAG and a parser for the grammar. We finish with an evaluation using a test suite

Moving toward the low-carbon hydrogen economy: experiences and key learnings from national case studies

The urgency to achieve net-zero carbon dioxide (CO2) emissions by 2050, as first presented by the IPCC special report on 1.5 °C Global Warming, has spurred renewed interest in hydrogen, to complement electrification, for widespread decarbonization of the economy. We present reflections on estimates of future hydrogen demand, optimization of infrastructure for hydrogen production, transport and storage, development of viable business cases, and environmental impact evaluations using life cycle assessments. We highlight challenges and opportunities that are common across studies of the business cases for hydrogen in Germany, the UK, the Netherlands, Switzerland and Norway. The use of hydrogen in the industrial sector is an important driver and could incentivise large-scale hydrogen value chains. In the long-term hydrogen becomes important also for the transport sector. Hydrogen production from natural gas with capture and permanent storage of the produced CO2 (CCS) enables large-scale hydrogen production in the intermediate future and is complementary to hydrogen from renewable power. Furthermore, timely establishment of hydrogen and CO2 infrastructures serves as an anchor to support the deployment of carbon dioxide removal technologies, such as direct air carbon capture and storage (DACCS) and biohydrogen production with CCS. Significant public support is needed to ensure coordinated planning, governance, and the establishment of supportive regulatory frameworks which foster the growth of hydrogen markets

CO2 Capture in Natural Gas Production by Adsorption Processes

Natural gas (NG) is the fossil fuel with the lowest emissions of CO2 per kilowatt of energy produced. In the case of transporting the natural gas through pipelines, the CO2 specifications depend on each country but are around 2-4%, so in case that the natural gas contains more than this percentage, CO2 has to be removed to meet specifications. In this study, we have evaluated the feasibility of using a Pressure Swing Adsorption (PSA) process for the removal of carbon dioxide from natural gas. This process is not commercially available yet and thus faces several challenges regarding the utilization of proper materials and efficient regeneration schemes. Our study has considered the effect of different PSA process operation modes. The PSA unit was designed to upgrade natural gas with a composition of 83% CH4, 10% CO2 and 7% C2H6 available at 70 bars at a temperature of 313 K and with an inlet flowrate of 500,000 Sm3/h. The analysis also considered several process variables. An economic comparison of the price of capture has also been done. Our analysis indicated that the cost of CO2 capture using PSA is around 40% higher than using amines dominated by poor performance in process recovery (NG lost with CO2). Since this is the first study of its kind, there is a lot of room to improve process performance and that adsorption processes for this application should not only be limited to very low concentrations.publishedVersio

A syntactic component for Vietnamese language processing

This paper presents the development of a grammar and a syntactic parser for the Vietnamese language. We first discuss the construction of a lexicalized tree-adjoining grammar using an automatic extraction approach. We then present the construction and evaluation of a deep syntactic parser based on the extracted grammar. This is a complete system that produces syntactic structures for Vietnamese sentences. A dependency annotation scheme for Vietnamese and an algorithm for extracting dependency structures from derivation trees are also proposed. This is the first Vietnamese parsing system capable of producing both constituency and dependency analyses. It offers encouraging performance: accuracy of 69.33% and 73.21% for constituency and dependency analysis, respectively

Offshore power generation with carbon capture and storage to decarbonise mainland electricity and offshore oil and gas installations: A techno-economic analysis

his study investigates the techno-economic potential of offshore power generation from natural gas with carbon capture and storage to reduce the climate impact of mainland electricity and the offshore oil and gas industry. This potential is assessed through techno-economic assessments over two relevant cases (“floating” and “shallow water” cases) including comparison with relevant reference concepts. In the base case evaluation, the offshore power plant concept toward decarbonising mainland electricity results in high costs (178 and 258 $/MWh respectively for the floating and shallow water cases) compared to a reference onshore power plant with carbon capture and storage (around 95$/MWh). However, a stronger potential is identified for the concept toward decarbonising offshore oil and gas platforms as the concept results in costs more comparable with the reference electrification concept (137 compared to 133 $/MWh in the floating case and 207 compared to 166$/MWh in the shallow water case). Although the base cases show a limited potential for the offshore concept, the results show that with technological improvements (advanced capture technology, reuse of infrastructure…) and more suited case characteristics (development based on associated gas…), the offshore concept offers a significant potential for cost-efficiently decarbonising the offshore oil and gas industry, while a more moderate potential is foreseen for the decarbonisation of mainland electricity.Offshore power generation with carbon capture and storage to decarbonise mainland electricity and offshore oil and gas installations: A techno-economic analysisacceptedVersio

Programmer en C

SIGLEAvailable at INIST (FR), Document Supply Service, under shelf-number : RP 10689 / INIST-CNRS - Institut de l'Information Scientifique et TechniqueFRFranc

Analyse et interpretation d'enonces dans un systeme de dialogue oral homme-machine finalise en langage naturel

Dans : Actes ERGO-IA'90, Biarritz, septembre 1990SIGLEAvailable at INIST (FR), Document Supply Service, under shelf-number : RP 10788 / INIST-CNRS - Institut de l'Information Scientifique et TechniqueFRFranc

Cooperation and representation of syntactic-semantic and pragmatic knowledge in a natural language task oriented spoken dialogue system

In Proceedings EUROSPEECH 89 (European conference on speech communication and technology), Paris, septembre 1989SIGLEAvailable at INIST (FR), Document Supply Service, under shelf-number : RP 10725 / INIST-CNRS - Institut de l'Information Scientifique et TechniqueFRFranc