Powered by OpenAIRE graph
Found an issue? Give us feedback

LETI

CEA LETI
Funder
Top 100 values are shown in the filters
Results number
arrow_drop_down
3,230 Projects, page 1 of 646
  • Funder: European Commission Project Code: 702590
    Overall Budget: 185,076 EURFunder Contribution: 185,076 EUR

    In the past 100 years, various theoretical approaches have been proposed to model the complex strong interaction between the neutrons and protons in a nucleus, however, a thorough understanding of its quantum structure is still far from being complete. Studies of the evolution of nuclear structure in mass regions away from the valley of stability have revealed dramatic modifications of the ordering of single-particle orbitals in exotic nuclei as compared to the ones predicted by the Shell Model. These surprising results have prompted the need for a detailed study of exotic nuclear systems in order to identify the driving forces behind them. The experimental study of these highly unstable exotic nuclear systems is extremely challenging and have become possible only recently due to the advent of radioactive ion beam facilities and highly efficient detection systems. This research project proposes to study neutron rich exotic nuclei in mass A~100-110 region though gamma-ray spectroscopy using fusion-fission and Coulomb excitation experiments. The experiments will measure the lifetime and static quadrupole moments in these nuclei, which will allow a determination of the shape and deformation of the nucleus. The results of these measurements will allow for a stringent test of various nuclear structure models. A study of shape evolution in these nuclei may also help in understanding the residual interactions responsible for changing shell structure in neutron rich nuclei. The experienced researcher will acquire new knowledge and training in nuclear structure physics and in innovative instrumentation, complementing her current expertise. She will learn about various aspects of experiment with radioactive ion beams and new data analysis techniques. She will also get the opportunity to improve her abilities in communicating scientific information to the scientific community as well as to the wider public.

    more_vert
  • Funder: European Commission Project Code: 715368
    Overall Budget: 1,500,000 EURFunder Contribution: 1,500,000 EUR

    The birth of a neutron star with an extremely strong magnetic field, called a magnetar, has emerged as a promising scenario to power a variety of outstanding explosive events. This includes gamma-ray bursts, among the most luminous events observed up to high redshift and therefore useful as cosmological probes, but also supernovae with extreme kinetic energies called hypernovae and other classes of super-luminous supernovae. Simple phenomenological models, where the magnetar rotation period and magnetic field are adjusted, can explain many of these observations but lack a sound theoretical basis. The goal of this proposal is to develop an ab initio description of magnetar powered explosions in order to delineate the role they play for the production of gamma-ray bursts and super-luminous supernovae. This is urgently needed to interpret the growing diversity of explosions observed with ongoing transient surveys (iPTF, CRTS, Pan-STARRS) and in the perspective of future programs of observations such as SVOM and LSST. By using state-of-the-art numerical simulations, the following outstanding questions will be addressed: 1) What is the origin of the gigantic magnetic field observed in magnetars? The physics of the magnetic field amplification in a fast-rotating nascent neutron star will be investigated thoroughly from first principles. By developing the first global protoneutron star simulations of this amplification process, the magnetic field strength and geometry will be determined for varying rotation rates. 2) What variety of explosion paths can be explained by the birth of fast-rotating magnetars? Numerical simulations of the launch of a hypernova explosion and a relativistic GRB jet will provide the first self-consistent description of both events from a millisecond magnetar. Furthermore, the new understanding of magnetic field amplification will be used to improve the realism of these simulations.

    more_vert
  • Funder: French National Research Agency (ANR) Project Code: ANR-24-CE44-1619
    Funder Contribution: 285,232 EUR

    Inositol pyrophosphates (IPP) have been recently characterized as important signaling molecules in organisms ranging from plants, slime moulds and fungi to mammals. Extensive research has been conducted on the IPP pathway revealing the role of these molecules on organogenesis, diseases (e.g., cancer metastasis and deafness), nutrient homeostasis, and plant hormone responses. IPPs are present in cells as multiple isomers at low concentrations, subject to rapid interconversion, making them a real challenge to monitor in vivo, and restricting our ability to define the specific roles of different IPP molecules. To solve this problem, and further determine the subcellular and tissular distribution of IPP molecules, we have initiated the design of a cellular reporter for monitoring IPPs in real-time. The reporter combines the cellular IPP receptor, formed by a SPX dimer, with the recently established split FAST system. Preliminary work in yeast showed that the first version of the reporter produces a black-and-white fluorescence change when responding to cellular IPP accumulations. We propose here to characterize the kinetics and dynamics of the IPP reporter in yeast cells and improve its selectivity to sense different IPP species and isomers. We further plan to transfer the IPP sensor to plants to address the fundamental characteristics of IPP signaling in a multicellular organism. We believe that the IPP reporter could be transferred in the future to cancer cell lines for a better understanding of IPP-regulated cancer metastasis.

    more_vert
  • Funder: European Commission Project Code: 655729
    Overall Budget: 248,598 EURFunder Contribution: 248,598 EUR

    Wetlands, fragile ecosystems that play an important role in the global water and carbon cycles, cover a non-negligible part of the terrestrial surface and render numerous services to humankind. Their role as carbon sinks or CO2 and CH4 sources depends on the prevailing hydrological conditions and is sensitive to rising atmospheric CO2 concentrations, regional climate change, as well as to water management and land use. Modifications of carbon and water dynamics within wetlands are already detectible and can be expected to amplify during the coming decades. Yet, numerous gaps of knowledge exist concerning their CO2 and CH4 flux quantifications and future dynamics, partly due to scarce global databases, and modelling of these dynamics are still highly uncertain. Focusing on China, where extensive wetlands exist and are projected to undergo vast changes, this project aims to analyse the response of wetland carbon emissions to changing hydrological conditions and atmospheric CO2 concentrations, taking into account contrasted regional land use and water management scenarios. An integrated approach combining measurements of CO2 and CH4 fluxes in numerous wetland types of China with new parameterizations of a dynamic vegetation model coupled with a hydrological model is proposed. The project covers changes occurring through the 20th and 21st centuries. It will be undertaken by the Researcher with two world leading teams in Earth System sciences, bringing in both expertise in modelling the terrestrial carbon cycle, datasets and knowledge of ecological processes. The research will deepen and broaden the Researcher’s competences, build long-term skills and collaborations, promote transfer of knowledge to China and contribute to European excellence and competitiveness. Special attention will be given to disseminating results to both the general public and the non-academic sector through a secondment.

    more_vert
  • Funder: European Commission Project Code: 620263
    more_vert
  • chevron_left
  • 1
  • 2
  • 3
  • 4
  • 5
  • chevron_right

Do the share buttons not appear? Please make sure, any blocking addon is disabled, and then reload the page.

Content report
No reports available
Funder report
No option selected
arrow_drop_down

Do you wish to download a CSV file? Note that this process may take a while.

There was an error in csv downloading. Please try again later.