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Search · four archives
21 papers · ranked by Valyu relevance
Sreejith Santhosh, Cuncheng Zhu, Blase Fencil, Mattia Serra
Coherent structures—flow features that organize material transport and deformation—are central to analyzing complex flows in fluids, plasmas, and active matter. Yet, identifying such structures on dynamic surfaces remains an open challenge, limiting their application to many living and synthetic systems. Here, we…
Tanner D. Harms, Steven L. Brunton, Beverley J. McKeon
Complex flows are often characterized using the theory of Lagrangian coherent structures (LCS), which leverages the motion of flow-embedded tracers to highlight features of interest. LCS are commonly employed to study fluid mechanical systems where flow tracers are readily observed, but they are broadly applicable to…
Leixin Liu, Wenwei Liu, Fei Wang, Xiaofeng Peng + 4 more
'Hua Cheng' 'Yangjian Cai' 'Shuqi Chen'] Optical information transmission is vital in modern optics and photonics due to its concurrent and multi-dimensional nature, leading to tremendous applications such as optical microscopy, holography, and optical sensing. Conventional optical information transmission technologies…
Jack D. Tyler, Alexander Wittig
In dynamical systems, it is advantageous to identify regions of flow which can exhibit maximal influence on nearby behaviour. Hyperbolic Lagrangian Coherent Structures have been introduced to obtain two-dimensional surfaces which maximise repulsion or attraction in three-dimensional dynamical systems with arbitrary…
Johannes Töger, Marcus Carlsson, Gustaf Söderlind, Håkan Arheden + 1 more
'Einar Heiberg'] Introduction Intracardiac blood flow measurements using 4D Phase Contrast CMR (4D PC-CMR) may contain useful information about cardiac pumping. Lagrangian Coherent Structures (LCS) is a new, operator-independent method which can simplify analysis by partitioning the flow into regions with different…
Martin Hammerschmidt, Lin Zschiedrich, Lauryna Šiaudinytė, Phillip Manley + 2 more
'Phillip Manley' 'Philipp‐Immanuel Schneider' 'Sven Burger'] Modelling the scattering of focused, coherent light by nano-scale structures is oftentimes used to reconstruct or infer geometrical or material properties of structures under investigation in optical scatterometry. This comprises both periodic and aperiodic…
Mario Lachetta, Hauke Sandmeyer, Alice Sandmeyer, Jan Schulte am Esch + 2 more
Digital micromirror devices (DMDs) are spatial light modulators that employ the electro-mechanical movement of miniaturized mirrors to steer and thus modulate the light reflected of a mirror array. Their wide availability, low cost and high speed make them a popular choice both in consumer electronics such as video…
M. Albrecht, O. Hort, M. Kozlová, M. Krůs + 1 more
Many applications of short-wavelength radiation impose strong requirements on the coherence properties of the source. However, the measurement of such properties poses a challenge, mainly due to the lack of high-quality optics and source fluctuations that often violate assumptions necessary for multi-shot or cumulative…
Julien R. Lhermitte, Aaron Stein, Cheng Tian, Yugang Zhang + 4 more
'Lutz Wiegart' 'Andrei Fluerasu' 'Oleg Gang' 'Kevin G. Yager'] A new technique is presented to allow the measurement of weakly scattering samples despite a high-background environment. Coherent interference between the sample and a nanofabricated ‘amplifier’ structure generates a strong interference scattering pattern…
Itamar Daniel Landau, Haim Sompolinsky
We present a simple model for coherent, spatially correlated chaos in a recurrent neural network. Networks of randomly connected neurons exhibit chaotic fluctuations and have been studied as a model for capturing the temporal variability of cortical activity. The dynamics generated by such networks, however, are…
S. V. U. Vedhanth, Shouvik Datta
Momentum space distributions of photons coming out of any light emitting materials/devices provide critical information about its underlying physical origin. Conventional methods of determining such properties impose specific instrumentational difficulties for probing samples kept within a low temperature cryostat.…
Petr Skopintsev, Andrej Singer, J. Bach, Leonard Müller + 14 more
'Björn Beyersdorff' 'S. Schleitzer' 'Oleg Gorobtsov' 'Anatoly Shabalin' 'Ruslan P. Kurta' 'Dmitry Dzhigaev' 'Oleksandr Yefanov' 'Leif Glaser' 'Anne Sakdinawat' 'G. Grübel' 'Robert Frömter' 'Hans Peter Oepen' 'Jens Viefhaus' 'Ivan A. Vartanyants'] We present a method to characterize the spatial coherence of soft X-ray…
H. Esat Kondakci, Andre Beckus, Ahmed El Halawany, Nafiseh Mohammadian + 2 more
'Nafiseh Mohammadian' 'George K. Atia' 'Ayman F. Abouraddy'] In absence of a lens to form an image, incoherent or partially coherent light scattering off an obstructive or reflective object forms a broad intensity distribution in the far field with only feeble spatial features. We show here that measuring the complex…
Hiroyuki Iwamoto
X-ray fiber diffraction is potentially a powerful technique to study the structure of fibrous materials, such as DNA and synthetic polymers. However, only rotationally averaged diffraction patterns can be recorded, and it is difficult to correctly interpret them without the knowledge of esoteric diffraction theories.…
Laura Kreinest, Benedikt Schober, Edgar Willenborg, Jochen Stollenwerk
'Jochen Stollenwerk'] Lasers are widely used for structuring metallic surfaces by ablating material. An alternative approach for laser structuring is surface structuring by laser remelting (WaveShape), which is based onthe continuous remelting of a thin surface layer using laser radiation while simultaneously…
Qinghua Wang, Satoshi Kishimoto, Hiroshi Tsuda
Three-way scanning electron microscope (SEM) moiré was first generated using a designed three-way electron beam (EB) in an SEM. The spot-type three-way SEM moiré comes from the interference between the three-way EB and the specimen grating in which the periodic cells are arranged in a triangular manner. The deformation…
F. Gori, R. Martı́nez-Herrero, Gemma Piquero, J. C. G. de Sande + 2 more
'Olga Korotkova' 'Massimo Santarsiero'] Both the intensity distribution and the degree of coherence between pairs of points along the propagation axis (z-coherence) are derived in closed form for a phenomenon of self-focusing produced by circularly coherent light. The first confirms results previously obtained…
Yifan Quan, Manoj V. H. Subramanya, Yifu Ouyang, Michael Mardini + 3 more
This paper presents a study of coherent dynamic nuclear polarization (DNP) using frequency swept pulses at 94 GHz which optimize the polarization transfer efficiency. Accordingly, an enhancement ℇ∼496 was observed using 10mM trityl-OX063 as the polarizing agent in a standard d8-glycerol:D2O:H2O :: 6:3:1 glassing matrix…
Ariana Peck, Qing Yao, Aaron S. Brewster, Petrus H. Zwart + 3 more
Structure determination methods are needed to resolve the atomic details that underlie protein function. X-ray crystallography has provided most of our knowledge of protein structure but is constrained by the need for large, well-ordered crystals and the loss of phase information. The rapidly developing methods of…
Christopher J. Kingsbury, Mathias O. Senge
We imagine molecules to be perfect, but rigidified units can be designed to bend from their ideal shape, discarding their symmetric elements as they process through vibrations and larger, more permanent distortions. The shape of molecules is either simulated or measured by crystallography and strongly affects chemical…
Martin Priessner, Anna Tomberg, Jon Paul Janet, Richard J. Lewis + 2 more
In the pursuit of improved compound identification and database search tasks, this study explores Heteronuclear Single Quantum Coherence (HSQC) spectra simulation and matching methodologies. HSQC spectra serve as unique molecular fingerprints, enabling a valuable balance of data collection time and information…