Výsledky vyhledávání

Report

Robust Disaster Assessment from Aerial Imagery Using Text-to-Image Synthetic Data

Autor: Kalluri, Tarun, Lee, Jihyeon, Sohn, Kihyuk, Singla, Sahil, Chandraker, Manmohan, Xu, Joseph, Liu, Jeremiah

We present a simple and efficient method to leverage emerging text-to-image generative models in creating large-scale synthetic supervision for the task of damage assessment from aerial images. While significant recent advances have resulted in impro

Externí odkaz: http://arxiv.org/abs/2405.13779

Zobrazit plný text záznamu

Report

'Beam `a la carte': laser heater shaping for attosecond pulses in a multiplexed x-ray free-electron laser

Electron beam shaping allows the control of the temporal properties of x-ray free-electron laser pulses from femtosecond to attosecond timescales. Here we demonstrate the use of a laser heater to shape electron bunches and enable the generation of at

Externí odkaz: http://arxiv.org/abs/2404.02299

Zobrazit plný text záznamu

Report

Benchmarking Collective Effects of Electron Interactions in a Wiggler with OPAL-FEL

Autor: Albà, Arnau, Seok, Jimin, Adelmann, Andreas, Doran, Scott, Ha, Gwanghui, Lee, Soonhong, Piao, Yinghu, Power, John, Qian, Maofei, Wisniewski, Eric, Xu, Joseph, Zholents, Alexander

OPAL-FEL is a recently developed tool for the modeling of particle accelerators containing wigglers or undulators. It extends the well established 3D electrostatic particle-tracking code OPAL, by merging it with the finite-difference time-domain elec

Externí odkaz: http://arxiv.org/abs/2112.02316

Zobrazit plný text záznamu

Report

Assessing Post-Disaster Damage from Satellite Imagery using Semi-Supervised Learning Techniques

Autor: Lee, Jihyeon, Xu, Joseph Z., Sohn, Kihyuk, Lu, Wenhan, Berthelot, David, Gur, Izzeddin, Khaitan, Pranav, Ke-Wei, Huang, Koupparis, Kyriacos, Kowatsch, Bernhard

To respond to disasters such as earthquakes, wildfires, and armed conflicts, humanitarian organizations require accurate and timely data in the form of damage assessments, which indicate what buildings and population centers have been most affected.

Externí odkaz: http://arxiv.org/abs/2011.14004

Zobrazit plný text záznamu

Report

Building Damage Detection in Satellite Imagery Using Convolutional Neural Networks

Autor: Xu, Joseph Z., Lu, Wenhan, Li, Zebo, Khaitan, Pranav, Zaytseva, Valeriya

In all types of disasters, from earthquakes to armed conflicts, aid workers need accurate and timely data such as damage to buildings and population displacement to mount an effective response. Remote sensing provides this data at an unprecedented sc

Externí odkaz: http://arxiv.org/abs/1910.06444

Zobrazit plný text záznamu

Report

Tunable Isolated Attosecond X-ray Pulses with Gigawatt Peak Power from a Free-Electron Laser

Publikováno v: Duris, J., Li, S., Driver, T. et al. Nat. Photonics 14, 30-36 (2020)

The quantum mechanical motion of electrons in molecules and solids occurs on the sub-femtosecond timescale. Consequently, the study of ultrafast electronic phenomena requires the generation of laser pulses shorter than 1 fs and of sufficient intensit

Externí odkaz: http://arxiv.org/abs/1906.10649

Zobrazit plný text záznamu