Extended Depth-of-Field and 3D Information Extraction in Digital Holographic Microscopy

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Pixelated differential phase contrast (DPC) is a four-dimensional scanning transmission electron microscopy (4D-STEM) technique in which the position of the transmitted beam is tracked to reconstruct the electromagnetic fields of a sample. Although it can provide (semi-) quantitative information for a range of different applications, the measurements are greatly affected by the microscope's optical and acquisition settings in terms of sensitivity, accuracy, and spatial resolution, particularly when measurin

Recently, rapid progress in the field of microautophagy (MI-autophagy) revealed the existence of multiple subtypes that differ in both intracellular membrane dynamics and molecular mechanisms. As a result, a single umbrella term "microautophagy" has become too vague, even creating some confusion among researchers both within and outside the field. We herein describe different subtypes of MI-autophagic processes and propose a systematic approach for naming them more accurately.

In recent years, the field of high-dimensional statistics has increasingly confronted a fundamental question: when are the signals we aim to recover not only statistically identifiable but also within reach of efficient algorithms? This question is not only relevant from a theoretical point of view, but has also practical implications across various fields, from machine learning and cryptography to communication networks and finance. Relying on methods from statistical physics of spin glasses, this thesis d

Understanding how the path of streamers is influenced by background electric fields is crucial in leader progression models and electrical breakdown models in long gaps. While numerous advanced models of streamers exist, applying them to leader progression models to track streamer movement remains computationally intensive and impractical. In this study, we employ one of the simplest streamer models available in the literature to investigate how streamers are deflected in the presence of background electric

This month, the IEEE Robotics and Automation Society (RAS) will celebrate 40 years of its flagship conference, the IEEE International Conference on Robotics and Automation (ICRA), with a special edition named ICRA@40. This unique event will be held from 23 to 26 September 2024 in Rotterdam, The Netherlands. ICRA@40 will feature more than 60 plenary talks by the most renowned scientists and industry leaders in the field of robotics and automation. These talks will provide invaluable insights into the latest

Dielectric Elastomer Actuators (DEAs) have a wide range of applications. They can be widely used in research to study cells under mechanical movement or stress. This is done by culturing the cells in vitro on the DEA and observing, under the microscope, the morphological and the numerous other important changes they are experiencing. However, in order to make sure that the effects observed on the cells are in fact from the mechanical stimuli alone, no other factors should be influencing the cells. Therefore

In this book you will find the extended abstracts of the 16th Euroseminar on Microscopy Applied to Building Materials (EMABM) held in Les Diablerets, Switzerland, from 14th to 17th May 2017. EMABM is one of the most important meeting which brings academicians, students, engineers, geoscientists and industry professionals together in order to share the latest developments and results in the field of characterization of past, present and future building materials. Special emphasis is given on various microsco

Photodynamic therapy (PDT) is a minimally invasive form of treatment, which is clinically approved for the treatment of angiogenic disorders, including certain forms of cancer and neovascular eye diseases. Although the concept of PDT has existed for a long time now, it has never made a solid entrance into the clinical management of cancer. This is likely due to secondary tissue reactions, such as inflammation and neoangiogenesis. The recent development of clinically effective angiogenesis inhibitors has lea

Magnetic resonance imaging (MRI) is one of the most powerful diagnostic techniques used in clinics. The need for higher spatial resoln. and better sensitivity led to the development of imagers working at high magnetic fields. The routine clin. use of 3 T MR systems raised the demand for MRI contrast agents working at this field or above. In the following we summarize the research in our research group on such high-field contrast agents.

The Seebeck and Nernst coefficients S and ν of the cuprate superconductor YBa2Cu3Oy (YBCO) were measured in a single crystal with doping p=0.12 in magnetic fields up to H=28T. Down to T=9 K, ν becomes independent of field by H 30T, showing that superconducting fluctuations have become negligible. In this field-induced normal state, S/T and ν/T are both large and negative in the T→0 limit, with the magnitude and sign of S/T consistent with the small electronlike Fermi surface pocket detected previously by qu

Assume that a stochastic processes can be approximated, when some scale parameter gets large, by a fluid limit (also called mean field limit", or hydrodynamic limit"). A common practice, often called the ``fixed point approximation" consists in approximating the stationary behaviour of the stochastic process by the stationary points of the fluid limit. It is known that this may be incorrect in general, as the stationary behaviour of the fluid limit may not be described by its stationary points. We show

We present a method for fast calculation of the electromagnetic field near the focus of an objective with a high numerical aperture (NA). Instead of direct integration, the vectorial Debye diffraction integral is evaluated with the fast Fourier transform for calculating the electromagnetic field in the entire focal region. We generalize this concept with the chirp z transform for obtaining a flexible sampling grid and an additional gain in computation speed. Under the conditions for the validity of the Deby

This paper present a novel approach to perform the tomography of biological specimen based on Digital Holographic Microscopy (DHM). A hologram results from the interference between a reference wave and an object wave reflected from or transmitted through a sample. In the hologram, both amplitude and phase of the field transmitted through the object are registered. In DHM, the object field is recovered when the hologram is processed by a digitally computed replica of the reference wave, allowing quantitative

The effect of gamma radiation on the physical-chemical properties of sodium alginate Algimar has been investigated. Dilution viscometry, densitometry, and FTIR spectroscopy served to identify modifications. Decreasing intrinsic viscosities clearly revealed chain cleavage for both solid alginate and alginate in aqueous solution. The invariance of the partial specific volume and infrared results indicate that chain degradation occurs without significant change of the chemical structure. The obtained results h

The aim of Optical Digital Holography, applied to cells and tissue imaging, is to provide an accurate 3D imaging of biologic materials, down to the microscopic scale. The method has been developed to yield a very precise determination of cells and tissues morphology. Targeted accuracies are in the sub-micron range and allow for the observation of very small movements band deformations, produced, in particular, by depolarization of excitable cells and their metabolic activities. Direct imaging of tissue stru

Superpositions of periodic dot screens are largely used in electronic imaging in the field of color printing. In such superpositions the interaction between the superposed layers may cause new structures to appear which did not exist in any of the original layers: macrostructures (also known as moiré patterns) and microstructures (also known as rosettes). While macrostructures are not always generated in the superposition (cf. moiré-free superpositions), microstructures exist practically in an

We summarize some of the main results on photoemission spectroscopy in the field of high T-c superconductivity, beginning with a discussion of several open questions. We then briefly analyze our experiments that illustrate the role of doping and of intentionally introduced disorder (by electron bombardment) in Bi2Sr2CaCu2O8+x single crystals.

We report on the electric field effects in photoluminescence (PL) and PL excitation (PLE) measurements of reverse-biased GaAs V-groove quantum wires. We observe large redshifts (9 meV at 265 kV/cm) of PL and PLE peaks as well as field dependent intensity and polarization anisotropy variations, which are analyzed by a two-dimensional quantum confined Stark effect model. (C) 1999 American Institute of Physics. [S0003-6951(99)00416-7].

A new method is presented for decoupling spins with S = 1 like D in anisotropic media while observing other spins such as residual protons in partly deuterated samples. The carrier frequency of a weak radiofrequency (RF) field is applied near the center of the doublet arising from the quadrupolar interaction of the S = 1 spins. The phase of the RF field is periodically reversed with intervals matching the reciprocal of the magnitude of the quadrupolar splitting. It is shown by theory and expt. that, even wh

The concepts of near-field optical microscopy and experimental and theoretical work carried out in Switzerland over the last 10 years are reviewed. After a description of the pioneering experiments of the mid-1980s, we focus on the recent efforts of the three Swiss laboratories currently working in the field in close collaboration. This newly refreshed initiative in near-field optics is supported by the Swiss Priority Program Optique.

Extended Depth-of-Field and 3D Information Extraction in Digital Holographic Microscopy

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Assessing the electric field sensitivity measured by pixelated differential phase contrast imaging in vacuum both in the absence of external fields and under field-bound conditions

Microautophagy: definition, classification, and the complexity of the underlying mechanisms

Tackling Hardness using Spin Glass Physics: from Inference to Sampling through Diffusions

Deflection of Electric Streamer Channels in an Applied Electric Field

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16th Euroseminar on Microscopy Applied to Building Materials

Angiogenesis inhibition for the improvement of photodynamic therapy: The revival of a promising idea

The challenge of T1 contrast agents for high-magnetic field MRI

Nernst and Seebeck Coefficients of the Cuprate Superconductor YBa_{2}Cu_{3}O_{6.67}: A Study of Fermi Surface Reconstruction

The Stationary Behaviour of Fluid Limits of Reversible Processes is Concentrated on Stationary Points

Fast focus field calculations

Biological cell (pollen grain) refractive index tomography with digital holographic microscopy

Physical-chemical Modification of Sodium Alginate ALGIMAR by Irradiation

Cells and tissue imaging with digital holographic microscopy

Analysis of the microstructures ("rosettes") in the superposition of periodic layers

Photoemission experiments on high-T-c superconductors: Recent progress and some open questions

Two-dimensional quantum-confined Stark effect in V-groove quantum wires: Excited state spectroscopy and theory

NMR of residual protons in partly deuterated anisotropic materials with phase-alternated decoupling of deuterium spins

Scanning Near-Field Optical Microscopy In Basel, Ruschlikon, And Zurich