Alexander Rack
YOU?
Author Swipe
View article: Quantifying Additive Manufacturing Vapor Plumes Using Laser‐Induced Breakdown Spectroscopy, Synchrotron X‐Ray Radiography and Simulations
Quantifying Additive Manufacturing Vapor Plumes Using Laser‐Induced Breakdown Spectroscopy, Synchrotron X‐Ray Radiography and Simulations Open
Understanding vaporization phenomena in laser powder bed fusion (LPBF) additive manufacturing has proven challenging; the links between laser‐induced metal vaporization, rate of elemental loss, and composition irregularities remain unclear…
View article: High-speed synchrotron radiography of nail penetration-induced thermal runaway: Understanding the explosive behavior of commercial sodium-ion batteries with NFM cathode
High-speed synchrotron radiography of nail penetration-induced thermal runaway: Understanding the explosive behavior of commercial sodium-ion batteries with NFM cathode Open
The dynamics of mechanically initiated thermal runaway (TR) events in cylindrical 18650 cells with NFM (Na(Ni1/3Fe1/3Mn1/3)O2), LFP (LiFePO4), and NMC532 (LiNi1/2Mn1/3Co1/5O2) cathode chemistries were investigated using high-speed synchrot…
View article: Studies of specific action integral and electro-thermal instabilities in the sub-microsecond underwater electrical explosions of shaped foils
Studies of specific action integral and electro-thermal instabilities in the sub-microsecond underwater electrical explosions of shaped foils Open
We present the results of two studies: (1) on the specific action integral h and (2) on the electrothermal instability (ETI) during underwater electrical explosions of different material foils. Values of h were studied in experiments with …
View article: Shock-induced bubble jets: a dual perspective of bubble collapse and interfacial instability theory
Shock-induced bubble jets: a dual perspective of bubble collapse and interfacial instability theory Open
Interactions between shock waves and gas bubbles in a liquid can lead to bubble collapse and high-speed liquid jet formation, relevant to biomedical applications such as shock wave lithotripsy and targeted drug delivery. This study reveals…
View article: Structure and function of the ovipositor of the encyrtid wasp Microterys flavus
Structure and function of the ovipositor of the encyrtid wasp Microterys flavus Open
Background Oviposition is crucial for the reproductive success of parasitoid insects and, hence, ovipositor structure and oviposition behaviour have probably played a central role in their adaptive evolution. However, various mechanical an…
View article: Synchrotron‐Based Analysis of Conical Implant–Abutment Connections Under Mechanical Load: How Embedding Materials Influence the Microgap and Implant Shoulder Deformation
Synchrotron‐Based Analysis of Conical Implant–Abutment Connections Under Mechanical Load: How Embedding Materials Influence the Microgap and Implant Shoulder Deformation Open
Objectives Dental implants have become a reliable solution for oral rehabilitation, but their long‐term success can be compromised by factors such as mechanical overload. To ensure the mechanical durability of implants, standardized testin…
View article: Shape modes and jet formation on ultrasound-driven wall-attached bubbles
Shape modes and jet formation on ultrasound-driven wall-attached bubbles Open
Understanding how bubbles on a substrate respond to ultrasound is crucial for applications from industrial cleaning to biomedical treatments. Under ultrasonic excitation, bubbles can undergo shape deformations due to Faraday instability, p…
View article: Mitigating ion flux vortex enables reversible zinc electrodeposition
Mitigating ion flux vortex enables reversible zinc electrodeposition Open
Metal anodes hold considerable promise for high-energy-density batteries but are fundamentally limited by electrochemical irreversibility caused by uneven metal deposition and dendrite formation, which compromise battery lifespan and safet…
View article: Deconvoluting cracking mechanisms in fusion processing of steel-copper multi-materials via <i>Operando</i> X-ray characterisation
Deconvoluting cracking mechanisms in fusion processing of steel-copper multi-materials via <i>Operando</i> X-ray characterisation Open
International audience
View article: Electrothermal instabilities observed by x-ray radiography of underwater sub-microsecond electrical explosions of aluminum, silver, and molybdenum wires
Electrothermal instabilities observed by x-ray radiography of underwater sub-microsecond electrical explosions of aluminum, silver, and molybdenum wires Open
We present measurements of the wavelength of electrothermal instabilities (ETI) formed during underwater electrical explosions of aluminum (Al), silver (Ag), and molybdenum (Mo) wires. Wires were exploded using a ∼450 ns rise time and ∼120…
View article: Physical twin of an industrial quad-laser powder bed fusion machine for high-speed multi-modal sensing measurements
Physical twin of an industrial quad-laser powder bed fusion machine for high-speed multi-modal sensing measurements Open
To faithfully capture the laser-material interaction and subsequent process dynamics during the industrial laser powder bed fusion process, we developed a Quad-laser in situ and operando process replicator (or the Quad-ISOPR) – a physical …
View article: Mitigating ion flux vortex enables reversible metal electrodeposition
Mitigating ion flux vortex enables reversible metal electrodeposition Open
Metal anodes hold considerable promise for high-energy-density batteries but are fundamentally limited by electrochemical irreversibility caused by uneven metal deposition and dendrite formation, which compromise battery lifespan and safet…
View article: Impulse-driven release of gas-encapsulated drops
Impulse-driven release of gas-encapsulated drops Open
Gas-encapsulated drops, much like antibubbles, are drops enclosed in a bubble within a liquid. They show potential as payload carriers in fluid transport and mixing techniques where sound waves can be leveraged to induce the collapse of th…
View article: Shape modes and jet formation on ultrasound-driven wall-attached bubbles
Shape modes and jet formation on ultrasound-driven wall-attached bubbles Open
Understanding how substrate-attached bubbles respond to ultrasound is important for applications from industrial cleaning to biomedical therapy. Under ultrasonic excitation, bubbles can deform through Faraday instability and periodically e…
View article: Combining in situ synchrotron X-ray imaging and multiphysics simulation to reveal pore formation dynamics in laser welding of copper
Combining in situ synchrotron X-ray imaging and multiphysics simulation to reveal pore formation dynamics in laser welding of copper Open
International audience
View article: Morphology and dynamics of the liquid jet in high-speed gas-assisted atomization retrieved through synchrotron-based high-speed X-ray imaging
Morphology and dynamics of the liquid jet in high-speed gas-assisted atomization retrieved through synchrotron-based high-speed X-ray imaging Open
International audience