About EPJ

The European Physical Journal (EPJ) is a series of peer-reviewed journals covering the whole spectrum of physics and related interdisciplinary subjects. EPJ is committed to high scientific quality in publishing and is indexed in all main citation databases.

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EPJ Plus Highlight - Describing growing tissues in the language of thermodynamics

Cellular arrangements surrounding a tumour

New analysis shows how key properties of biological tissues can be accurately described in the mathematical language of Onsager’s variational principle, widely used to describe continually changing systems in thermodynamics.

A key feature of biological tissues is their inhomogeneity and their ability to grow via cell reproduction. To study this behaviour, it is important to describe it using equations, which account for factors including growth rates, chemical signalling, and tissue structure.

In doing this, researchers aim to develop consistent continuous descriptions of these deeply complex systems: accurately predicting properties such as cell reproduction rates, disorder, and how their growth varies in different space directions, depending on their interactions.

Through new analysis published in EPJ Plus, Joseph Ackermann and Martine Ben Amar at Sorbonne University Paris, show that tissue development can be reliably captured within ‘Onsager’s variational principle’: a mathematical framework used widely in thermodynamics.

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EPJ D Highlight – Estimating uncertainty in atomic spectroscopy

Many papers added to NIST databases mention atomic spectroscopy topics. Few of these include uncertainty estimates. Credit: A. Kramida (2024)

A numerical toolbox offers a robust way to evaluate uncertainty in atomic wavelength measurements.

If you repeat a measurement with the same or different instruments, you’ll get slightly different numbers each time. Estimating the uncertainties associated with these numbers turns them into an informative result. In a study published in EPJ D, Alexander Kramida, of the National Institute of Standards and Technology in Maryland, USA, now explains a new statistical approach for estimating the uncertainty associated with atomic spectroscopy measurements. He discusses how this approach can be applied both to measurements of spectral line wavelengths, and to other atomic properties that are indirectly determined from them.

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EPJ Web of Conferences Highlight - mm Universe 2023 - Observing the Universe at mm Wavelengths

mm Universe 2023 conference held in Grenoble (France).

The mm Universe 2023 conference is the third edition in a series of biennial workshops. It is devoted to the observations of the sky at millimetre wavelengths, which has contributed to tremendous improvements in our understanding of a great variety of scientific topics ranging from the star formation in the Milky Way to the measurement of cosmological parameters.

The mm Universe 2023 conference held in Grenoble (France), from 26 to 30 June 2023, has been organized by LPSC (CNRS and Université Grenoble Alpes). With more than a hundred of attendees from 14 countries, it brought together the scientific community working on topics related to the mm Universe, spanning from stellar to cosmological scales.

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