Publications de Xiang Li | EPFL Graph Search

Experimental demonstration of attosecond pump-probe spectroscopy with an X-ray free-electron laser

Jun Wang, Christoph Bostedt, Siqi Li, Zhen Zhang, Zhaoheng Guo, Xiang Li

Pump-probe experiments with subfemtosecond resolution are the key to understanding electronic dynamics in quantum systems. Here we demonstrate the generation and control of subfemtosecond pulse pairs from a two-colour X-ray free-electron laser. By measurin ...

Nature Publishing Group2024

BigNeuron: a resource to benchmark and predict performance of algorithms for automated tracing of neurons in light microscopy datasets

Pascal Fua, Sean Lewis Hill, Amos Sironi, Jiancheng Yang, Jian Zhou, Siqi Liu, Xiang Li, Jie Zhou

BigNeuron is an open community bench-testing platform with the goal of setting open standards for accurate and fast automatic neuron tracing. We gathered a diverse set of image volumes across several species that is representative of the data obtained in m ...

2023

Ni-Based Nanoparticles Catalyzed Hydrodeoxygenation of Ketones, Ethers, and Phenols to (Cyclo) Aliphatic Compounds

Paul Joseph Dyson, Yelin Hu, Matthias Beller, Mingyang Liu, Xiang Li

Catalytic hydrodeoxygenation is of prime importance in the valorization of biomass-based feedstocks to produce essential chemicals and fuels. To carry out this process in a more cost-effective and sustainable manner, the use of 3D-metal-based nanostructure ...

Amer Chemical Soc2023

Electrification and digitalization effects on sectoral energy demand and consumption: A prospective study towards 2050

François Maréchal, Fabian Heymann, Xiang Li

Energy transition is blurring the boundaries between the demand and supply sides with growing participation of prosumer resources. The intensifying pace of electrification and digitalization during the past decade tends to continue, leading to potential te ...

PERGAMON-ELSEVIER SCIENCE LTD2023

Deep excavation of the impact from endogenous and exogenous uncertainties on long-term energy planning

François Maréchal, Xiang Li

Endogenous and exogenous uncertainties exert significant influences on energy planning. In this study, we propose a systematic methodology to excavate the uncertainty space, by combining mix-integer linear programming (MILP), Monte Carlo simulation, and ma ...

ELSEVIER2023

A Cobalt Nanocatalyst for the Hydrogenation and Oxidative Dehydrogenation of N-heterocycles

Paul Joseph Dyson, Yelin Hu, Matthias Beller, Mingyang Liu, Xiang Li

Catalytic hydrogenation and oxidative dehydrogenation of N-heterocycles to produce tetrahydroquinoline and quinoline derivatives are important reactions of particular importance in the agrochemical and pharmaceutical industries. Herein, we report earth-abu ...

Wiley-VCH Verlag2023

Towards a negative-emission society

Xiang Li

Negative carbon emissions are proved necessary to limit global temperature increase below 1.5C compared to pre-industrial levels. (a) Reducing carbon sources and (b) increasing negative emissions are two effective ways to achieve this goal. (a) involves th ...

EPFL2022

Where is the money ? A decomposition of monetary flows behind fossil fuels

François Maréchal, Jonas Schnidrig, Raphaël Briguet, Xiang Li

Transition from fossils to renewables is leading to radical societal changes. Shifting the capital from fossils to renewables is commonly accompanied with political concerns, such as energy autonomy, domestic employment etc. Despite a decreasing trend in r ...

DTU Construct2022

Assessment of the role of infrastructure in high share renewable energy systems

François Maréchal, Jonas Schnidrig, Xiang Li

The transition of the global energy sector from fossil-based towards a zero-carbon system is a necessity to mitigate the impacts of climate change. The ratification of both, the Paris agreement in 2015 and the European Green Deal in 2019, illustrates the p ...

DTU Construct2022

Regionalisation in high share renewable energy system modelling

François Maréchal, Tuong-Van Nguyen, Jonas Schnidrig, Xiang Li

Governments are setting ambitious targets to tackle the issue of global warming by switching to renewable energy sources and reducing CO2 -emissions. For example, as announced in November 2020, Canada aims to achieve net zero GHG emissions by 2050. Large c ...

IEEE2022

Prospective study on the cost evolution for key energy technologies

François Maréchal, Xiang Li

Drastic variations of energy costs are witnessed in past decades, especially for low-carbon technologies, where decreasing and increasing trends co-existed. Estimating the cost evolution in the future is hence essential in long-term energy planning. Despit ...

2022

Appendix - A modelling framework for assessing the impact of green mobility technologies on energy systems

François Maréchal, Tuong-Van Nguyen, Jonas Schnidrig, Xiang Li

A successful decarbonisation of the European Union, coupled with a high integration of renewable energy and ambitious targets for energy efficiency, can only be reached with a significant contribution from the transportation sector. It currently represents ...

2021

A modelling framework for assessing the impact of green mobility technologies on energy systems

François Maréchal, Tuong-Van Nguyen, Jonas Schnidrig, Xiang Li

A successful decarbonisation of the European Union, coupled with a high integration of renewable energy and ambitious targets for energy efficiency, can only be reached with a significant contribution from the transporta- tion sector. It currently represen ...

2021

Appendix: Regionalisation in high share renewable energy system modelling

François Maréchal, Tuong-Van Nguyen, Jonas Schnidrig, Xiang Li

This document corresponds to the appendix of the paper Regionalisation in high share renewable energy system modelling by Schnidrig et al. in redaction, and is based on the Master thesis of Amara Slaymaker 2021, giving additional information about the meth ...

2021

Dynamic optimization modelling for a national-scale energy sysem in transition

François Maréchal, Subhash Kumar, Xiang Li

2021

Application of artificial intelligence on uncertainty analysis for long-term energy system planning

François Maréchal, Jonas Schnidrig, Xiang Li

2021

Electronic Population Transfer via Impulsive Stimulated X-Ray Raman Scattering with Attosecond Soft-X-Ray Pulses

Solène Oberli, Andre Al Haddad, Christoph Bostedt, Siqi Li, Xiang Li

Free-electron lasers provide a source of x-ray pulses short enough and intense enough to drive nonlinearities in molecular systems. Impulsive interactions driven by these x-ray pulses provide a way to create and probe valence electron motions with high tem ...

AMER PHYSICAL SOC2020

Decarbonization in Complex Energy Systems: A Study on the Feasibility of Carbon Neutrality for Switzerland in 2050

François Maréchal, Stefano Moret, Boris Meier, Theodoros Damartzis, Xiang Li

Decarbonization gained prominence with the witnessed rise of temperature over recent years, particularly in the aftermath of the adoption of the Paris agreement for limiting the temperature increase within 2°C until 2050. Biogenic resources are explicitly ...

2020

The role of storage in the Swiss energy transition

François Maréchal, Stefano Moret, Xiang Li

The transition towards more sustainable, fossil-free energy systems is interlinked with a high penetration of stochastic renewables, such as wind and solar. In this context, energy storage technologies of different kinds - namely electrical, thermal and ch ...

2019

Are renewables really that expensive? The impact of uncertainty on the cost of the energy transition

François Maréchal, Stefano Moret, Francesco Baldi, Xiang Li

The dramatic evidence of climate change is making the transition to more renewable energy systems an urgent global priority. As energy planners normally look 20-50 years ahead, it is crucial to consider the key uncertainties stemming from inaccurate foreca ...

ELSEVIER SCIENCE BV2019