Results 71 to 80 of about 151,031 (208)
Cosmic Shock Waves on Large Scales of the Universe [PDF]
arXiv, 1997 In the standard theory of the large scale structure formation, matter accretes onto high density perturbations via gravitational instability. Collisionless dark matter forms caustics around such structures, while collisional baryonic matter forms accretion shocks which then halt and heat the infalling gas.
arxiv
Dynamic and statistical analysis of giant hail environments in northeast Italy
Quarterly Journal of the Royal Meteorological Society, EarlyView.The hailstorm of record‐breaking hail size that occurred on July 24, 2023 in NE Italy developed in an unusual environment, characterized by moderate instability but intense southwesterly flow and water‐vapor transport in the mid‐troposphere. A high‐Θe$$ {\varTheta}_{\mathrm{e}} $$ tongue over the Adriatic Sea was lifted above a cold pool and fed the ...
Francesco De Martin +4 more
wiley +1 more source
Statistical Complexity of Quantum Learning
Advanced Quantum Technologies, EarlyView.The statistical performance of quantum learning is investigated as a function of the number of training data N$N$, and of the number of copies available for each quantum state in the training and testing data sets, respectively S$S$ and V$V$. Indeed, the biggest difference in quantum learning comes from the destructive nature of quantum measurements ...
Leonardo Banchi +3 more
wiley +1 more source
Electromagnetic Mechanism for the Origin of Knots in Parsec Scale Jets [PDF]
arXiv, 2003 We consider the propagation and stability of the helical electromagnetic perturbations in a relativistic force-free Pointing flux dominated jet (magnetic helix). Perturbations are found to dissipate energy in the vicinity of the resonant surfaces inside the jet, where the resonance of the perturbation with the Alfven waves occurs.
arxiv
Quantum‐Noise‐Driven Generative Diffusion Models
Advanced Quantum Technologies, EarlyView.Diffusion Models (DMs) are today a very popular class of generative models for Machine Learning (ML), using a noisy dynamics to learn an unknown density probability of a finite set of samples in order to generate new synthetic data. This study proposes a method to generalize them into the quantum domain by introducing and investigating what are termed ...
Marco Parigi +2 more
wiley +1 more source
Efficient Simulation of Open Quantum Systems on NISQ Trapped‐Ion Hardware
Advanced Quantum Technologies, EarlyView.Open quantum systems exhibit rich dynamics that can be simulated efficiently on quantum computers, allowing us to learn more about their behavior. This work applies a new method to simulate certain open quantum systems on noisy trapped‐ion quantum hardware.
Colin Burdine +3 more
wiley +1 more source
Performance of a Superconducting Quantum Battery
Advanced Quantum Technologies, EarlyView.The authors introduce a scheme for superconducting quantum battery (SQB) consisting of two coupled superconducting qubits that interact during the unitary charging process while remaining in equilibrium with a thermal reservoir. This work highlights the complexities of tuning system parameters, which increase the potential for work extraction from the ...
Samira Elghaayda +5 more
wiley +1 more source
River Research and Applications, EarlyView.ABSTRACT Hydropower dams come with high ecological and social costs, not least concerning longitudinal connectivity in rivers, which causes declines and sometimes local extinctions of fish species. Fishways are widely used to allow fish to pass dams, but their efficiency is highly variable between species and sites.
Florian Eggers +6 more
wiley +1 more source
Update on the German and Australasian Optical Ground Station Networks
International Journal of Satellite Communications and Networking, EarlyView.ABSTRACT Networks of ground stations designed to transmit and receive at visible and infra‐red wavelengths through the atmosphere offer an opportunity to provide on‐demand, high‐bandwidth, secure communications with spacecraft in Earth orbit and beyond. This work describes the operation and activities of current free space optical communications (FSOC)
Nicholas J. Rattenbury +24 more
wiley +1 more source
Mechanical Evolution of Metastatic Cancer Cells in 3D Microenvironment
Small, EarlyView.The mechanical evolution of cancer cells within 3D spheroids is monitored using Brillouin microscopy. High‐resolution and densely mapped mechanical data are used to extract the spatially resolved and temporally dynamic mechanical properties of the cancer cells.
Karlin Hilai +8 more
wiley +1 more source