Spin torque ferromagnetic resonance with magnetic field modulation

We demonstrate a technique of broadband spin torque ferromagnetic resonance (ST-FMR) with magnetic field modulation for measurements of spin wave properties in magnetic nanostructures. This technique gives great improvement in sensitivity over the conventional ST-FMR measurements, and application of this technique to nanoscale magnetic tunnel junctions (MTJs) reveals a rich spectrum of standing spin wave eigenmodes. Comparison of the ST-FMR measurements with micromagnetic simulations of the spin wave spectrum allows us to explain the character of low-frequency magnetic excitations in nanoscale MTJs.Comment: Also see: http://faculty.sites.uci.edu/krivorotovgroup

On Useful Conformal Tranformations In General Relativity

Local conformal transformations are known as a useful tool in various applications of the gravitational theory, especially in cosmology. We describe some new aspects of these transformations, in particular using them for derivation of Einstein equations for the cosmological and Schwarzschild metrics. Furthermore, the conformal transformation is applied for the dimensional reduction of the Gauss-Bonnet topological invariant in $d=4$ to the spaces of lower dimensions.Comment: 17 pages, LaTeX. The paper is intended mainly for pedagogical purposes and represents a collection of exercises concerning local conformal transformations and dimensional reduction. To be published in "Gravitation and Cosmology

Effects of gluon number fluctuations on photon - photon collisions at high energies

We investigate the effects of gluon number fluctuations on the total $\gamma\gamma$, $\gamma^*\gamma^*$ cross sections and the photon structure function $F_2^\gamma(x,Q^2)$. Considering a model which relates the dipole-dipole and dipole-hadron scattering amplitudes, we estimate these observables by using event-by-event and physical amplitudes. We demonstrate that both analyses are able to describe the LEP data, but predict different behaviours for the observables at high energies, with the gluon fluctuations effects decreasing the cross sections. We conclude that the study of $\gamma \gamma$ interactions can be useful to constrain the QCD dynamics.Comment: 9 pages, 6 figures. Improved version with two new figures. Version to be published in Physical Review

WebProt\'eg\'e: A Cloud-Based Ontology Editor

We present WebProt\'eg\'e, a tool to develop ontologies represented in the Web Ontology Language (OWL). WebProt\'eg\'e is a cloud-based application that allows users to collaboratively edit OWL ontologies, and it is available for use at https://webprotege.stanford.edu. WebProt\'ege\'e currently hosts more than 68,000 OWL ontology projects and has over 50,000 user accounts. In this paper, we detail the main new features of the latest version of WebProt\'eg\'e

Outlook in tissue-engineered magnetic systems and biomagnetic control

The advancement of tissue engineering strategies has opened up new therapeutic avenues in the regeneration of many musculoskeletal tissues and cell niches. The burst of research in nanotechnology associated with tissue engineering brings inputs for the precise control of cells and cellular environments, that can play an important role in the development of these new therapies. Magnetic actuation, especially in combination with magnetic nanoparticles, may be a valuable tool in the interaction with living systems, such as stem cell guidance, retention, stimulation, and differentiation. Advances in the field of magnetic technology have also enabled the fabrication of increasingly complex systems such as cell sheets, organoids, or bioprinted scaffolds. Our Opinion article highlights this promising field of research and attempts to cover some of the most recent contributions to both tissue engineering and regenerative medicine. The advancement of tissue engineering strategies has opened up new therapeutic avenues in the regeneration of many musculoskeletal tissues and cell niches. The burst of research in nanotechnology associated with tissue engineering brings inputs for the precise control of cells and cellular environments, that can play an important role in the development of these new therapies. Magnetic actuation, especially in combination with magnetic nanoparticles, may be a valuable tool in the interaction with living systems, such as stem cell guidance, retention, stimula- tion, and differentiation. Advances in the field of magnetic technology have also enabled the fabrication of increasingly complex systems such as cell sheets, organoids, or bioprinted scaffolds. Our Opinion article highlights this promising field of research and attempts to cover some of the most recent con- tributions to both tissue engineering and regenerative medicine.Authors acknowledge the European Research Council COG MagTendon No. 772817, the H2020 Achilles Twinning project No. 810850, and the FCT e Fundação para a Ciência e a Tecnologia under the Scientific Employment Stimulus - Individual Call (CEEC Individual) - 2020.01157. CEECIND/CP1600/CT0024

A measure to evaluate the sensitivity to genotype-by-environment interaction in 6 grapevine clones

Background and Aims: The development of an efficient clonal selection process requires 25 the study of genotype-by-environment (G×E) interaction. This work aims to evaluate the 26 variability of the G×E interaction among genotypes and to identify the less sensitive ones. 27 Methods and Results: The approach involves the fitting of mixed models to yield data taking 28 into account the correlation induced by the repeated measurements of the same plot over the 29 years. A measure for comparative evaluation of the G×E interaction among genotypes is 30 proposed (Interaction Sensitivity, IS), based on the variance of the values of the empirical best 31 linear unbiased predictors of G×E interaction effects across environments. In all cases studied 32 significant G×E interaction variability was found, and the proposed measure to rank the 33 sensitivity to G×E interaction varied widely among genotypes. 34 Conclusions: The existence of a common contribution shared by all observations made in the 35 same plot was detected, independently of the lag between years. The proposed measure to 36 rank the sensitivity to G×E interaction permitted identification of stable genotypes. 37 Significance of the Study: This work studied G×E interaction problem in the context of 38 grapevine and proposes a measure for the comparative evaluation of the G×E interaction 39 among genotypesinfo:eu-repo/semantics/acceptedVersio