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Search · four archives
22 papers · ranked by Valyu relevance
Christian Amor, Adrián Corrochano, Giovanni Soligo, Soledad Le Clainche + 1 more
The addition of a small amount of long-chain polymers confers viscoelastic properties to Newtonian flows. The resulting non-Newtonian solution now exhibits different dynamics, such as enhanced mixing at low Reynolds, where elastic instabilities can trigger elastic turbulence even though inertial turbulence is absent.…
Andrés Cremades, Sergio Hoyas, Ricardo Vinuesa
For the last 140 years, the mechanisms of transport and dissipation of energy in a turbulent flow have not been completely understood. Previous research has focused on analyzing the so-called coherent structures, organized flow patterns characterized by their spatial coherence, lifespan and significant contribution to…
Shiyi Chen, Xiaogang Deng, Cunbiao Lee
This review summarizes recent advances in the origin of turbulence. The soliton-like coherent structure (SCS) has been identified not only as a common structure in natural and K-type transitions, but also as a fundamental structure in N-type, O-type and bypass-type transitions, which dominate turbulence generation. It…
Melvin Vaupel, Valdemar Kargård Olsen, Sigurd Gaukstad, Erik Hermansen + 1 more
Neural recordings are usually analyzed by comparing neural spiketrains or comparing time bins (population vectors). If multiple variables drive the neural activity these comparisons will be affected by all of them. Our aim is to disentangle the different latent variables or covariates that drive neural activity and…
Xinru Lian, Yaning Zhou, Xin Liu, Zhao Zhang + 6 more
Partially coherent beams have attracted considerable attention due to their intrinsic resilience against complex environmental perturbations. However, the intrinsic wavefront fluctuations make it fundamentally challenging to preserve well-defined orbital angular momentum during propagation. In this work, we propose and…
Junjie Zhao, Kazuro Kizaki, Atsushi Taguchi, Madoka Ono + 2 more
We report the first demonstration of surface relief formation by irradiating material with non-degenerate hybrid vortex modes. These modes are formed via the coherent superposition of two Laguerre-Gaussian (LG) modes with different orbital angular momentum (OAM) indices, and they carry non-zero OAM. Intriguingly, the…
Authors not listed
While oscillatory structural forces (solvation/depletion) are ubiquitous in colloidal systems, the mechanism by which they guide the precise self-assembly of complex particles remains elusive. Here, we reveal that the extreme sensitivity of these damped oscillatory forces to surface orientation stems from their…
Fengling Zhang, Xiaomeng Liu, Antonios Pelekanidis, Matthias Gouder + 2 more
and Thickness-Resolved Transmission Imaging Using Coherent Extreme Ultraviolet Radiation Authors: Fengling Zhang, Xiaomeng Liu, Antonios Pelekanidis, Matthias Gouder, Kjeld S. E. Eikema, Stefan Witte Microscopy with extreme ultraviolet (EUV) radiation enables high-resolution imaging with excellent material contrast…
Maciej Wojtkowski
Significance Strong scattering in biological tissues limits the achievable imaging depth and produces noiseboth coherent and incoherentthat impairs contrast in volumetric in vivo reconstructions. By dynamically tailoring spatial and temporal coherence to suppress scattered photons, spatio-temporal optical coherence…
Ayman F. Abouraddy, Bahaa E. A. Saleh
Optical coherence is a well-established branch of physical optics in which the statistical properties of fluctuating optical fields are described in terms of correlation functions over continuous spatial and temporal degrees of freedom (DoFs). Nevertheless, in any practical setting, only discrete DoFs are ever…
Yi-Wei Tsai, Gung-Chian Yin, Bo-Yi Chen, Hsin-Wei Chen + 7 more
The newly commissioned hard X-ray ptychography endstation at the Taiwan Photon Source, TPS 25A2, is introduced, detailing the instrumental specifications and demonstrating a benchmark spatial resolution of 6.9 nm in 2D, showcased through the imaging of a standard test pattern, inorganic nanoparticles and a complex…
Authors not listed
The electron spin is a natural qubit platform and, when embedded in a molecule, its properties can be tailored via synthetic chemistry. However, the quantum properties can be utilised only for a limited time and lengthening this coherence time is still challenging. Nuclear spin dynamics is one of the principal sources…
Fangyuan Zhao, Hanyao Tang, Xuerong Zou, Xinghui Li + 1 more
Advanced manufacturing places stringent demands on measurement technologies, requiring ultra-high precision, non-contact operation, high throughput, and real-time adaptability. Optical metrology, with its distinct advantages, has become a key enabler in this context. This paper reviews optical metrology techniques from…
Konstantin Burdonov, Mikhail Zolotavin, Alexey Sidnev, Evgeny Blinov + 9 more
This paper presents a four-channel prototype system for the geometric combining and coherent addition of tightly focused femtosecond laser radiation into a standing-wave field configuration. A stabilization system for beam pointing and relative phase of the four optical channels has been implemented, and its…
Haiyang Li, Yijie Shen
Detecting Pancharatnam-Berry (PB) or geometric phases of light usually requires complex interferometry or diffraction through a specially designed truncated aperture. In this work, we present a simpler method that enables direct, visual measurement of geometric phases in certain complex structured light fields, without…
Yang Run-qing, Villanueva-Perez, Pablo, Kahnt + 1 more
Multi-beam ptychography (MBP) offers a scalable solution to improve the throughput of state-of-the-art ptychography by increasing the number of coherent beams that illuminate the sample simultaneously. However, increasing the number of beams in ptychography makes ptychographical reconstructions more challenging and…
Agathe Nidriche, Jacques Ollivier, J Ross Stewart, Judith Peters
Neutron scattering is a powerful technique to investigate atomic structures and molecular dynamics of proteins at the nano-scale. When it comes to dynamics, incoherent and coherent scattering respectively provide information on the single and collective dynamics of nuclei. In proteins, hydrogen has the highest…
Bikash Kumar Das, Marcelo F. Ciappina
Light is the fundamental medium through which we perceive the world around us. In the modern era, thanks to remarkable technological advancements, light can not only be used in its raw form but can also be used as a versatile tool. Generally, light fields carry energy and momentum (both linear and angular). Due to the…
Authors not listed
Recent experiments demonstrated the possibilities of modifying ground-state chemical reaction rates by placing an ensemble of molecules in an optical microcavity. A strong collective, resonant coupling between the cavity mode and molecular vibrations forms vibration-polaritons. This regime is commonly referred to as…
Authors not listed
This article presents an overview about the state of the art in the development of structured packings for distillation applications. The focus is on highlighting different approaches including heuristic development cycles, the development of new packing structures, 3D-printing as tool for manufacturing, and…
Muyuan Chen
Cryogenic electron tomography (CryoET) provides 3D views of vitrified cellular samples, and protein structures can be determined from the tomograms by averaging many copies of the same protein computationally. However, the resolution of these averaged structures, particularly for smaller proteins, is often constrained…
Mark F. Coughlan, Lei Zhang, Rebecca T. Perelman, Umar Khan + 5 more
Fluorescence microscopy is a cornerstone of biological research. However, fluorescent labeling is challenging in live cells and is constrained by photobleaching and phototoxicity. Label-free methods allow cells to be studied in their native state, but most techniques have poor contrast, lack 3D capability, rely on…