Charles Renard
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In-flight emission measurements with an autonomous payload behind a turboprop aircraft Open
This paper reports on the successful first deployment of a new, autonomously operating measurement system on a Grob G 520 Egrett aircraft, which was used as a chase aircraft to perform in-flight aerosol and trace gas measurements of engine…
View article: Fuel sulfur content can modulate contrail ice crystal numbers
Fuel sulfur content can modulate contrail ice crystal numbers Open
In recent efforts to reduce the radiative forcing of aviation, fuel design has gained increased attention. Sustainable Aviation Fuels are seeing wider adoption, and their positive impact on carbon dioxide and non-volatile soot particle emi…
View article: Non-Invasive Assessment of Aircraft Engine Particulate Matter Emissions with Lidar
Non-Invasive Assessment of Aircraft Engine Particulate Matter Emissions with Lidar Open
Particulate matter (PM) emitted by aircraft engines primarily consists of soot particles formed through incomplete fuel combustion, which can act as ice nuclei in the formation of contrails and contribute to poor air quality around airport…
View article: Electric-field-assisted phase switching for crystal phase quantum dot fabrication in GaAs nanowires
Electric-field-assisted phase switching for crystal phase quantum dot fabrication in GaAs nanowires Open
The occurrence of several crystal phases within nanostructures of a single material presents both challenges and opportunities. While unintended phase mixing can degrade optoelectronic performances, deliberate control of polytypism enables…
View article: In-situ Electric-Field-Assisted Growth of GaAs Nanowires
In-situ Electric-Field-Assisted Growth of GaAs Nanowires Open
International audience
In-flight emission measurements with an autonomous payload behind a turboprop aircraft Open
This paper reports on successfully testing a new, autonomously operating measurement system on a Grob G 520 Egrett aircraft for in-flight aerosol and trace gas measurements of engine exhaust. A suite of in-house-built and commercially avai…
View article: Fuel sulfur content can modulate contrail ice crystal numbers
Fuel sulfur content can modulate contrail ice crystal numbers Open
In recent efforts to reduce the radiative forcing of aviation, fuel design has gained increased attention. Sustainable Aviation Fuels (SAF) are seeing wider adoption, and their positive impact on CO2 and non-volatile soot particle emission…
View article: Substantial aircraft contrail formation at low soot emission levels
Substantial aircraft contrail formation at low soot emission levels Open
Contrail cirrus are a major contributor to the climate forcing from aviation. Yet, the number of contrail ice crystals forming behind aircraft with modern lean-burn engines is unknown. Theory spans a five orders of magnitude range in ice c…
Modeling the formation of contrails produced by SAF emissions Open
Alternative aviation fuels represent a promising approach to reduce contrails climate effect. In the frame of VOLCAN (“VOL avec Carburants Alternatifs Nouveaux”) project (DGAC funding, collaboration with AIRBUS, Safran Aircraft Engines and…
RANS simulations for contrail formation modelling Open
Condensation trails (contrails) are ice clouds formed at high altitudes as a result of water-vapour condensing and freezing on soot particles and sulphate aerosols which are present in the aircraft engine plumes (case of soot-rich combusti…
Phase controlled epitaxy of wurtzite ZnS thin films by metal organic chemical vapor deposition Open
International audience
View article: Analysis of the Photoluminescence Bandgap Temperature Dependence to Investigate the Doping of Micrometric Size GaAs Crystals Grown on Silicon for Tandem Solar Cells Applications
Analysis of the Photoluminescence Bandgap Temperature Dependence to Investigate the Doping of Micrometric Size GaAs Crystals Grown on Silicon for Tandem Solar Cells Applications Open
This work presents and discusses the extraction of the active dopants density of GaAs layers from the modeling of the bandgap temperature dependence derived from photoluminescence measurements.
Epitaxy of Hexagonal Ge-2H : Lessons from in Situ TEM Observations Open
Silicon and Germanium crystallize in the cubic diamond structure 3C with which they dominate definitely the electronics. Playing on crystal phases in semiconductors occurs to be a valuable mean of electronic band engineering. Remarkably, t…
View article: Measurement report: In-flight and ground-based measurements of nitrogen oxide emissions from latest-generation jet engines and 100 % sustainable aviation fuel
Measurement report: In-flight and ground-based measurements of nitrogen oxide emissions from latest-generation jet engines and 100 % sustainable aviation fuel Open
Nitrogen oxides, emitted from air traffic, are of concern due to their impact on climate by changing atmospheric ozone and methane levels. Using the DLR research aircraft Falcon, total reactive nitrogen (NOy) in-flight measurements were ca…
View article: Measurements of particle emissions of an A350-941 burning 100 % sustainable aviation fuels in cruise
Measurements of particle emissions of an A350-941 burning 100 % sustainable aviation fuels in cruise Open
In order to reduce aviation's CO2 emissions and comply with current climate targets, the European Union plans a mandatory quota of 2 % sustainable aviation fuel (SAF) by 2025, rising up to ≥70 % SAF by 2050. In addition to a reduction of l…
View article: From nanosphere lithography to localised heteroepitaxy of GaAs on Si
From nanosphere lithography to localised heteroepitaxy of GaAs on Si Open
International audience
View article: Tuning Superconductivity in Nanosecond Laser‐Annealed Boron‐Doped Si<sub>1–<i>x</i></sub>Ge<sub><i>x</i></sub> Epilayers
Tuning Superconductivity in Nanosecond Laser‐Annealed Boron‐Doped Si<sub>1–<i>x</i></sub>Ge<sub><i>x</i></sub> Epilayers Open
Superconductivity in ultradoped Si 1− x Ge x :B epilayers is demonstrated by nanosecond laser doping, which allows introducing substitutional B concentrations well above the solubility limit and up to 7 at%. A Ge fraction x ranging from 0 …
View article: Comment on egusphere-2024-1224
Comment on egusphere-2024-1224 Open
Abstract. In order to reduce aviation’s CO2 emissions and comply with current climate targets, the European Union plans a mandatory quota of 2 % sustainable aviation fuel (SAF) by 2025, rising up to ≥ 70 % SAF by 2050. In addition to a red…
View article: Measurements of particle emissions of an A350-941 burning 100 % sustainable aviation fuels in cruise
Measurements of particle emissions of an A350-941 burning 100 % sustainable aviation fuels in cruise Open
In order to reduce aviation’s CO2 emissions and comply with current climate targets, the European Union plans a mandatory quota of 2 % sustainable aviation fuel (SAF) by 2025, rising up to ≥ 70 % SAF by 2050. In addition to a reduction of …
View article: Comment on egusphere-2024-454
Comment on egusphere-2024-454 Open
Abstract. Nitrogen oxides, emitted from air traffic, are of concern due to their impact on climate by changing atmospheric ozone and methane levels. Using the DLR research aircraft Falcon, total reactive nitrogen (NOy) measurements were ca…
View article: Comment on egusphere-2024-454
Comment on egusphere-2024-454 Open
Abstract. Nitrogen oxides, emitted from air traffic, are of concern due to their impact on climate by changing atmospheric ozone and methane levels. Using the DLR research aircraft Falcon, total reactive nitrogen (NOy) measurements were ca…
View article: Tuning superconductivity in nanosecond laser annealed boron doped $Si_{1-x}Ge_{x}$ epilayers
Tuning superconductivity in nanosecond laser annealed boron doped $Si_{1-x}Ge_{x}$ epilayers Open
Superconductivity in ultra-doped $Si_{1-x}Ge_{x}:B$ epilayers is demonstrated by nanosecond laser doping, which allows introducing substitutional B concentrations well above the solubility limit and up to $7\,at.\%$. A Ge fraction $x$ rang…
View article: Powering aircraft with 100 % sustainable aviation fuel reduces ice crystals in contrails
Powering aircraft with 100 % sustainable aviation fuel reduces ice crystals in contrails Open
Powering aircraft by sustainable aviation fuels (SAFs) is a pathway to reduce the climate impact of aviation by lowering aviation lifecycle CO2 emissions and by reducing ice crystal numbers and radiative forcing from contrails. While the e…
View article: In-flight and ground-based measurements of nitrogen oxide emissions from latest generation jet engines and 100% sustainable aviation fuel
In-flight and ground-based measurements of nitrogen oxide emissions from latest generation jet engines and 100% sustainable aviation fuel Open
Nitrogen oxides, emitted from air traffic, are of concern due to their impact on climate by changing atmospheric ozone and methane levels. Using the DLR research aircraft Falcon, total reactive nitrogen (NOy) measurements were carried out …
View article: Measurement report: In-flight and ground-based measurements of nitrogen oxide emissions from latest generation jet engines and 100% sustainable aviation fuel
Measurement report: In-flight and ground-based measurements of nitrogen oxide emissions from latest generation jet engines and 100% sustainable aviation fuel Open
Nitrogen oxides, emitted from air traffic, are of concern due to their impact on climate by changing atmospheric ozone and methane levels. Using the DLR research aircraft Falcon, total reactive nitrogen (NOy) measurements were carried out …
View article: Development of Monolithically Integrated (Al)GaAs on Silicon for Tandem Solar Cells
Development of Monolithically Integrated (Al)GaAs on Silicon for Tandem Solar Cells Open
We present here an innovative solution to heterogeneously integrated III-V materials on silicon based on the growth of micrometric GaAs crystals on silicon without any structural defects nor stress, using Epitaxal Lateral Overgrowth on Tun…
View article: Powering aircraft with 100% sustainable aviation fuel reduces ice crystals in contrails
Powering aircraft with 100% sustainable aviation fuel reduces ice crystals in contrails Open
Powering aircraft by sustainable aviation fuels (SAF) is a pathway to reduce the climate impact of aviation by lowering aviation life-cycle CO2 emissions and by reducing ice crystal numbers and radiative forcing from contrails. While the e…