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Recent experiments conducted in the International Space Station highlight the apparent periodicity of leaf oscillations and other biological phenomena associated with rhythmic variations of lunisolar forces. These events are similar to…

Classical Physics · Physics 2020-11-03 Henri Gouin

We present the first seasonal cycle of gravity wave potential energy densities from ground-based lidar at high northern latitudes (Andenes/Norway, $69^{\circ}$N, $16^{\circ}$E) and compare with similar observations performed at middle…

Atmospheric and Oceanic Physics · Physics 2020-04-27 Marwa Almowafy , Gerd Baumgarten , Kathrin Baumgarten , Manfred Ern , Michael Gerding , Franz-Josef Lübken , Irina Strelnikova

While single-tree transpiration is challenging to compare with earth observation, canopy scale data are suitable for this purpose. To test the potentialities of the second approach, we equipped the trees at two measurement sites with sap…

Applications · Statistics 2021-08-05 Enrico Tomelleri , Giustino Tonon

Alterations of charges density on membranes (potentials) of plant cells by ion currents lead to disbalance of Coulomb forces compressing membranes and counteracting Hookean elastic forces. It should results in membrane vibrations till…

Biological Physics · Physics 2007-05-23 Mark E. Perel'man , Galina M. Rubinstein

Poplar is one of the best fast-growing trees in the world, widely used for windbreak and wood product. Although architecture of poplar has direct impact on its applications, it has not been descried in previous poplar models, probably…

Dynamical Systems · Mathematics 2010-12-16 Dongxiang Liu , Meng Zhen Kang , Véronique Letort , Meijun Xing , Yang Gang , Xinyuan Huang , Weiqun Cao

We present a new formulation of the loop-tree duality theorem for higher loop diagrams valid both for massless and massive cases. $l$-loop integrals are expressed as weighted sum of trees obtained from cutting $l$ internal propagators of…

High Energy Physics - Phenomenology · Physics 2019-11-22 Robert Runkel , Zoltán Szőr , Juan Pablo Vesga , Stefan Weinzierl

The paper presents preliminary results of studying variations in the annual component in the Earth's polar motion. For this purpose, a signal with an annual period was extracted, firstly, from the series of pole coordinates of the…

Geophysics · Physics 2025-07-02 Natalia Miller , Zinovy Malkin

NMR spin echo measurements of C-13 in C60, Y-89 in Y2O3, and Si-29 in silicon are shown to defy conventional expectations when more that one pi pulse is used. Multiple pi-pulse echo trains may either freeze our or accelerate the decay of…

Quantum Physics · Physics 2007-05-23 Dale Li , A. E. Dementyev , Yanqun Dong , R. G. Ramos , S. E. Barrett

The coupling between plasma flows and magnetic fields in the solar atmosphere governs the transport of angular momentum and the redistribution of magnetic flux, yet its manifestation in the magnetically dominated upper chromosphere remains…

Solar and Stellar Astrophysics · Physics 2026-05-05 Srinjana Routh , Anshu Kumari , Rohan Bose , Vaibhav Pant , Divya Paliwal , Dipankar Banerjee , Nat Gopalswamy

When measuring the one-dimensional power spectrum of the Ly$\alpha$ forest, it is common to measure the power spectrum in flux fluctuations red-ward of the Ly$\alpha$ emission of quasars and subtract this power from the measurements of the…

Cosmology and Nongalactic Astrophysics · Physics 2014-05-13 Vid Iršič , Anže Slosar

To date, the weak-phase $\gamma$ has been measured using two-body $B$-meson decays such as $B\to D K$ and $B\to D\pi$, whose amplitudes contain only tree-level diagrams. But $\gamma$ can also be extracted from three-body charmless hadronic…

High Energy Physics - Phenomenology · Physics 2018-11-28 Bhubanjyoti Bhattacharya , David London

We measure the power spectrum, P_F(k,z), of the transmitted flux in the Ly-alpha forest using 3035 high redshift quasar spectra from the Sloan Digital Sky Survey. This sample is almost two orders of magnitude larger than any previously…

The trajectory of Earth about the Sun is perturbed by torques exerted by the Moon and Sun, and also the four giant planets. These provoke variations of insolation at Earth surface, known as kyr-long Milankovi\'c cycles. The concept has been…

Sap transport in trees has long fascinated scientists, and a vast literature exists on experimental and modelling studies of trees during the growing season when large negative stem pressures are generated by transpiration from leaves. Much…

Biological Physics · Physics 2015-09-22 Isabell Graf , Maurizio Ceseri , John M. Stockie

This article presents a power-spectrum analysis of 2,350 measurements of the $^{90}$Sr/$^{90}$Y decay process acquired over the interval 4 August 2002 to 6 February 2009 at the Lomonosov Moscow State University (LMSU). As we have found for…

Solar and Stellar Astrophysics · Physics 2015-06-04 Peter A. Sturrock , Alexander G. Parkhomov , Ephraim Fischbach , Jere H. Jenkins

This article presents a power-spectrum analysis of 39,024 measurements of the solar diameter made at the Mount Wilson Observatory from 1968.670 to 1997.965. This power spectrum contains a number of very strong peaks. We find that eight of…

Solar and Stellar Astrophysics · Physics 2015-05-20 Peter A. Sturrock , Luca Bertello

The Sun's polar magnetic fields are directly related to solar cycle variability. The strength of the polar fields at the start (minimum) of a cycle determine the subsequent amplitude of that cycle. In addition, the polar field reversals at…

Solar and Stellar Astrophysics · Physics 2014-08-01 Lisa Upton , David H. Hathaway

I provide two short derivations for the Shklovskii effect, which describes the apparent secular period drift of a periodic source due to its motion on the sky. These derivations use easily visualizable geometry and calculus, and might be…

High Energy Astrophysical Phenomena · Physics 2025-09-30 Thomas Donlon

On the basis of the model of the current flow through a single fibre, changes in the electric charge density over the myocardium are described. With the use of relevant analytic formulae, supported with numerical calculations, the…

Medical Physics · Physics 2007-05-23 Jerzy S. Janicki

Circular polarization spectroscopy has proven to be an indispensable tool in photosynthesis research and (bio)-molecular research in general. Oxygenic photosystems typically display an asymmetric Cotton effect around the chlorophyll…

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