cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Enhancing Secrecy in UAV RSMA Networks: Deep Unfolding Meets Deep Reinforcement Learning
Creators: name: Adam, Abuzar B. M.
name: Elhassan, Mohammed A. M.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Cryptography and Security (cs.CR)
subject: Emerging Technologies (cs.ET)
subject: Networking and Internet Architecture (cs.NI)
subject: Signal Processing (eess.SP)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: In this paper, we consider the maximization of the secrecy rate in multiple unmanned aerial vehicles (UAV) rate-splitting multiple access (RSMA) network. A joint beamforming, rate allocation, and UAV trajectory optimization problem is formulated which is nonconvex. Hence, the problem is transformed into a Markov decision problem and a novel multiagent deep reinforcement learning (DRL) framework is designed. The proposed framework (named DUN-DRL) combines deep unfolding to design beamforming and rate allocation, data-driven to design the UAV trajectory, and deep deterministic policy gradient (DDPG) for the learning procedure. The proposed DUN-DRL have shown great performance and outperformed other DRL-based methods in the literature.
description: 5 pages, 5 figures, conference
The Sphere Packing Bound for DSPCs with Feedback a la Augustin
Creators: name: Nakiboglu, Baris
Publisher: name: arXiv
Year: 2018
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: Establishing the sphere packing bound for block codes on the discrete stationary product channels with feedback ---which are commonly called the discrete memoryless channels with feedback--- was considered to be an open problem until recently, notwithstanding the proof sketch provided by Augustin in 1978. A complete proof following Augustin's proof sketch is presented, to demonstrate its adequacy and to draw attention to two novel ideas it employs. These novel ideas (i.e., the Augustin's averaging and the use of subblocks) are likely to be applicable in other communication problems for establishing impossibility results.
description: 12 pages, 2 figures
Isomorphism of Hierarchical Structures
Creators: name: Radin, Charles
name: Sadun, Lorenzo
Publisher: name: arXiv
Year: 1998
Subjects: subject: Mathematical Physics (math-ph)
subject: Dynamical Systems (math.DS)
subject: FOS: Physical sciences
subject: FOS: Mathematics
subject: 52C22 (Primary) 28D05, 54H20, 58F11 (Secondary)

description: We consider hierarchical structures such as Fibonacci sequences and Penrose tilings, and examine the consequences of different choices for the definition of isomorphism. In particular we discuss the role such a choice plays with regard to matching rules for such structures.
description: Plain TeX. 15 pages including two embedded postscript figures
Hypertriton lifetime
Creators: name: Gazda, D.
name: Pérez-Obiol, A.
name: Gal, A.
name: Friedman, E.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Nuclear Theory (nucl-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: Over the last decade, conflicting values of the hypertriton ${}_Λ^3\mathrm{H}$ lifetime $τ({}_Λ^3\mathrm{H})$ were extracted from relativistic heavy-ion (RHI) collision experiments, ranging from values compatible with the free-$Λ$ lifetime $τ_Λ$-as expected naively for a very weakly bound $Λ$ in ${}_Λ^3\mathrm{H}$-to lifetimes as short as $τ({}_Λ^3\mathrm{H}) \approx (0.4-0.7)\,τ_Λ$. In a recent work [Phys. Lett. B 811, 135916 (2020)] we studied this ${}_Λ^3\mathrm{H}$ lifetime puzzle theoretically using realistic three-body ${}_Λ^3\mathrm{H}$ and ${}^3\mathrm{He}$ wave functions computed within the ab initio no-core shell model approach with interactions derived from chiral effective field theory. In particular, $τ({}_Λ^3\mathrm{H})$ was found to be strongly correlated with the $Λ$ separation energy $B_Λ$ in ${}_Λ^3\mathrm{H}$, the value of which is rather poorly known experimentally and, in addition, is known to suffer from sizable theoretical uncertainties inherent in the employed nuclear and hypernuclear interaction models. In the present work we find that these uncertainties propagate into $τ({}_Λ^3\mathrm{H})$, and thus limit considerably the theoretical precision of its computed value. Although none of the conflicting RHI measured $τ({}_Λ^3\mathrm{H})$ values can be excluded, but rather can be attributed to a poor knowledge of $B_Λ$, we note the good agreement between the lifetime value $τ({}_Λ^3\mathrm{H})=238(27)$ ps computed at the lowest value $B_Λ=66$ keV reached by us and the very recent ALICE measured lifetime value $τ^{\mathrm{ALICE}}({}_Λ^3\mathrm{H})=253(11)(6)$ ps associated with the ALICE measured $B_Λ$ value $B^{\mathrm{ALICE}}_Λ=102(63)(67)$ keV [Phys. Rev. Lett. 131, 102302 (2023)].
description: 15 pages, 6 figures, 3 tables; minor changes, matches published version
The Heston stochastic volatility model with piecewise constant parameters - efficient calibration and pricing of window barrier options
Creators: name: Guterding, Daniel
name: Boenkost, Wolfram
Publisher: name: arXiv
Year: 2018
Subjects: subject: Pricing of Securities (q-fin.PR)
subject: Computational Finance (q-fin.CP)
subject: FOS: Economics and business

description: The Heston stochastic volatility model is a standard model for valuing financial derivatives, since it can be calibrated using semi-analytical formulas and captures the most basic structure of the market for financial derivatives with simple structure in time-direction. However, extending the model to the case of time-dependent parameters, which would allow for a parametrization of the market at multiple timepoints, proves more challenging. We present a simple and numerically efficient approach to the calibration of the Heston stochastic volatility model with piecewise constant parameters. We show that semi-analytical formulas can also be derived in this more complex case and combine them with recent advances in computational techniques for the Heston model. Our numerical scheme is based on the calculation of the characteristic function using Gauss-Kronrod quadrature with an additional control variate that stabilizes the numerical integrals. We use our method to calibrate the Heston model with piecewise constant parameters to the foreign exchange (FX) options market. Finally, we demonstrate improvements of the Heston model with piecewise constant parameters upon the standard Heston model in selected cases.
Supersymmetric Naturalness Beyond MSSM
Creators: name: Kobakhidze, Archil
name: Talia, Matthew
Publisher: name: arXiv
Year: 2018
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The experiments at the Large Hadron Collider (LHC) have pushed the limits on masses of supersymmetric particles beyond the $\sim$TeV scale. This compromises naturalness of the simplest supersymmetric extension of the Standard Model, the minimal supersymmetric Standard Model (MSSM). In this paper we advocate that perhaps the current experimental data are actually hinting towards the physics beyond MSSM. To illustrate this, we treat MSSM as a low energy limit of a more fundamental yet unspecified theory at a scale $Λ$, and compute the fine-tuning measure $Δ$ for generic boundary conditions on soft SUSY breaking parameters and various cut-off scales. As a general trend we observe reduction in fine-tuning together with lowering $Λ$. In particular, perfectly natural [$Δ\lesssim \mathcal{O}(10)$] theories with a multi-TeV spectrum of supersymmetric particles and consistent with all current observations can be obtained for $Λ\sim \mathcal{O}(100)$TeV. The lowering of the fine-tuning for large cut-off scales can also be observed in theories exhibiting special quasi-fixed point behaviours of parameters. Our observations call for a more throughout exploration of possible alternative ultraviolet completions of MSSM.
description: 13 pages, 4 figures, updated to match JHEP
Towards Precision Muonic X-Ray Measurements of Charge Radii of Light Nuclei
Creators: name: Ohayon, Ben
name: Abeln, Andreas
name: Bara, Silvia
name: Cocolios, Thomas Elias
name: Eizenberg, Ofir
name: Fleischmann, Andreas
name: Gastaldo, Loredana
name: Godinho, César
name: Heines, Michael
name: Hengstler, Daniel
name: Hupin, Guillaume
name: Indelicato, Paul
name: Kirch, Klaus
name: Knecht, Andreas
name: Kreuzberger, Daniel
name: Machado, Jorge
name: Navratil, Petr
name: Paul, Nancy
name: Pohl, Randolf
name: Unger, Daniel
name: Vogiatzi, Stella
name: von Schoeler, Katharina
name: Wauters, Frederik
Publisher: name: arXiv
Year: 2023
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: Nuclear Experiment (nucl-ex)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We propose an experiment to measure the nuclear charge radii of light elements with up to 20~times higher accuracy. These are essential both for understanding nuclear physics at low energies, and for experimental and theoretical applications in simple atomic systems. Such comparisons advance the understanding of bound-state quantum electrodynamics and are useful for searching for new physics beyond the Standard Model. The energy levels of muonic atoms are highly susceptible to nuclear structure, especially to the mean square charge radius. The radii of the lightest nuclei (with the atomic number, $Z=1,2$) have been determined with high accuracy using laser spectroscopy in muonic atoms, while those of medium mass and above were determined using X-ray spectroscopy with semiconductor detectors. In this communication, we present a new experiment, aiming to obtain precision measurements of the radii of light nuclei $3 \leq Z \leq 10$ using single-photon energy measurements with cryogenic microcalorimeters; a quantum-sensing technology capable of high efficiency with outstanding resolution for low-energy X-rays.
Quantum Games and Quantum Strategies
Creators: name: Eisert, J.
name: Wilkens, M.
name: Lewenstein, M.
Publisher: name: arXiv
Year: 1998
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We investigate the quantization of non-zero sum games. For the particular case of the Prisoners' Dilemma we show that this game ceases to pose a dilemma if quantum strategies are allowed for. We also construct a particular quantum strategy which always gives reward if played against any classical strategy.
description: 4 pages, 4 figures, typographic sign error in the definition of the operator J corrected
Motacilla acredula Linnaeus, 1758, spec. nov.
Creators: name: Linnaeus, Carolus
Publisher: name: Laurentius Salvius
Year: 1758
Subjects: Biodiversity
Taxonomy
Animalia
Chordata
Aves
Passeriformes
Motacillidae
Motacilla
Motacilla acredula

description: Motacilla acredula [spec. nov.]
M. supra cinereo-virescens, remigibus fuscis: septimo octavo nono apice albis. Fn. svec. 237.
Habitat in Europa.
description: Published as part of Linnaeus, Carolus, 1758, Systema Naturae per regna tria naturae: secundum classes, ordines, genera, species, cum characteribus, differentiis, synonymis, locis, Stockholm :Laurentius Salvius on page 189, DOI: 10.5962/bhl.title.542, http://zenodo.org/record/3922206
Ellipse Hyperbola and Their Conjunction
Creators: name: Kobiera, Arkadiusz
Publisher: name: arXiv
Year: 2018
Subjects: subject: History and Overview (math.HO)
subject: FOS: Mathematics
subject: 51M04

description: The article presents simple analysis of cones which are used to generate a given conic curve by section by a plane. It was found that if the given curve is an ellipse, then the locus of vertexes of the cones is a hyperbola. The hyperbola has focuses which coincidence with the ellipse vertexes. Similarly, if the given curve is the hyperbola, the locus of vertex of the cones is the ellipse. In the second case, the focuses of the ellipse are located in the hyperbola's vertexes. These two relationships create kind of conjunction between the ellipse and the hyperbola which originate from the cones used for generation of these curves. The presented conjunction of the ellipse and hyperbola is perfect example of mathematical beauty which may be shown by use of very simple geometry. As in the past the conic curves appear to be very interesting and fruitful mathematical beings.
description: 16 pages, 6 figures, revised version with minor corrections
Journée FRB 2023 sur les recommandations - Les actes
Creators: name: Coulomb, Pauline
Publisher: name: Fondation pour la recherche sur la biodiversité
Year: 2024
Subjects: recommandations

description: La recherche est de plus en plus interpellée pour intervenir en appui à la prise de décisions. Pourvoyeuse de recommandations pour l’action, conceptrice d’outils pour initier, et réussir, la transition écologique, les rôles qui lui sont attribués sont multiples et l’exposent à de nouveaux enjeux. 

Omniprésents et en première ligne de l’interface science-société, les sujets biodiversité font face aux difficultés de répondre à la fois aux exigences de la recherche et aux besoins de la société. À l’occasion de la Journée FRB 2023, la FRB a invité chercheurs, décideurs et acteurs de la société à se réunir pour confronter leurs besoins, leurs attentes et leurs possibilités d’action autour des recommandations.
Projections in Rotation Algebras and Theta Functions
Creators: name: Boca, Florin P.
Publisher: name: arXiv
Year: 1998
Subjects: subject: Operator Algebras (math.OA)
subject: FOS: Mathematics
subject: 46L05, 11F27, 46L85

description: For each $α\in (0,1)$, $A_α$ denotes the universal $C^*$-algebra generated by two unitaries $u$ and $v$, which satisfy the commutation relation $uv=\exp (2πiα)vu$. We consider the order four automorphism $σ$ of $A_α$ defined by $σ(u)=v$, $σ(v)=u^{-1}$ and describe a method for constructing projections in the fixed point algebra $A_α^σ$, using Rieffel's imprimitivity bimodules and Jacobi's theta functions. In the case $α=q^{-1}$, $q\in {\mathbf Z}$, $q\geq 2$, we give explicit formulae for such projections and find a lower bound for the norm of the Harper operator $u+u^* +v+v^*$.
description: Fixes some numerical issues in the published version
Spin-Mediated Direct Photon Scattering by Plasmons in BiTeI
Creators: name: Lee, A. C.
name: Sarkar, S.
name: Du, K.
name: Kung, H. -H.
name: Won, C. J.
name: Wang, K.
name: Cheong, S. -W.
name: Maiti, S.
name: Blumberg, G.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We use polarization resolved Raman spectroscopy to demonstrate that for a 3D giant Rashba system the bulk plasmon collective mode can directly couple to the Raman response even in the long wavelength $\mathbf q \rightarrow 0$ limit. Although conventional theory predicts the plasmon spectral weight to be suppressed as the square of its quasi-momentum and thus negligibly weak in the Raman spectra, we observe a sharp in-gap plasmon mode in the Raman spectrum of BiTeI below the Rashba continuum. This coupling, in a polar system with spin-orbit coupling, occurs without assistance from phonons when the incoming photon excitation is resonant with Rashba-split intermediate states. We discuss the distinctive features of BiTeI's giant Rashba system band structure that enable the direct observation of plasmon in Raman scattering.
description: Editors' Suggestion
Developing a model of mitochondrial heteroplasmy in human pluripotent stem cell-derived cardiomyoctes
Creators: name: Pinto Ricardo, Carolina
Publisher: name: Imperial College London
Year: 2017

description: Hypertrophic cardiomyopathy and arrhythmias are common in patients with heteroplasmic mtDNA mutations but their pathogenesis and how the levels of mutation change in patients over time remain poorly understood. Therefore, a robust in vitro model of heteroplasmy in cardiomyocytes (CMs) is currently needed. This thesis addressed the hypothesis that human induced pluripotent stem cell-cardiomyocytes (hiPSCs-CMs) with heteroplasmic mitochondrial dysfunction recapitulated cardiac features associated with mtDNA disease. We have applied maturation strategies to identify culture conditions where the maximal metabolic potential of healthy hiPSC-CMs could be achieved to later determine if that was compromised in models of heteroplasmy. Time in culture and T3 did not improve mitochondrial function in hiPSC-CMs and consequently were not further applied. Antimycin A and menadione impair the electron transport chain and increase the production of reactive oxygen species and were used to generate a drug-induced model of heteroplasmy using healthy hiPSC-CMs. We found that the cells’ mitochondrial function recovered from antimycin A and menadione damage, possibly due to a quick mitochondrial turnover and so this approach could not be pursued. Instead, CMs were generated by differentiating hiPSCs reprogrammed from somatic cells of a patient with the A3243G mtDNA mutation. The levels of heteroplasmy increased with hiPSC passaging and we obtained pure populations of A3243G hiPSC-CMs with heteroplasmy levels ranging from 23 to 45% and preserved structural properties. Most functional properties were also maintained but mutant hiPSC-CMs showed a delay in the initiation of the calcium transient, which could explain the episodes of bradycardias that occur in patients with mtDNA diseases. Here, we have demonstrated that hiPSC-CMs can be used to investigate the cardiac abnormalities associated with mtDNA disease but concluded that higher levels of heteroplasmy would be required to detect a disease phenotype in these cells. Future work on heteroplasmic drifts in hiPSC culture will provide crucial information about the pathogenesis of mtDNA disease and into the drift that might happen with age in children resulting from mitochondrial replacement therapy, where a small amount of mutant mtDNA is carried over.
A conventional and solid-state synthesis, biological activity, and molecular docking studies of 6-arylbenzo[4,5]imidazo[1,2-a] [1,8]naphthyridin-10-ols
Creators: name: Sakram Boda
name: Dharavath, Ravi
name: Madhavaram, Madhavi
name: Kurumanna Adem
name: Palithapu, Madhu
name: Maloth, Govan
name: Parthasarathy T
Publisher: name: Taylor & Francis
Year: 2018
Subjects: subject: Biochemistry
subject: Medicine
subject: Biotechnology
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: 69999 Biological Sciences not elsewhere classified
subject: FOS: Biological sciences

description: An effective, practical, and simple approach toward the preparation of highly-substituted 6-arylbenzo[4, 5]imidazo[1,2-a][1,8]naphthyridin-10-ols 6(a-h) by the reaction of 3-aryl-1,8-naphthyridin-2-amines 3(a-h) with benzoquinone 4 in acid catalyzed cyclization under solid-state method, as well as conventional conditions, has been described. The products are obtained in good yields and in a solid of high purity. The major advantages of solid states are easy workup, low costs, short reaction time, good efficacy, and environment-friendly procedure. The newly synthesized compounds were thoroughly characterized using spectral data and elemental analyses. All compounds were screened for their biological evaluation. Predominantly 6b and 6c compounds showed the highest antibacterial activity. Moreover, all the synthesized compounds were docked against topoisomerase II DNA gyrase enzyme.
String Islands
Creators: name: Dabholkar, Atish
name: Harvey, Jeffrey A.
Publisher: name: arXiv
Year: 1998
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We discuss string theories with small numbers of non-compact moduli and describe constructions of string theories whose low-energy limit is described by various pure supergravity theories. We also construct a D=4,N=4 compactification of type II string theory with 34 vector fields.
description: An erroneous example removed. We thank Massimo Bianchi and Cumrun Vafa for pointing out this error
Tensor 2H4He Interaction and 6Li Properties in the Potential Cluster Model
Creators: name: Dubovichenko, S. B.
Publisher: name: arXiv
Year: 1998
Subjects: subject: Nuclear Theory (nucl-th)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: A new parameterization of the gaussian 2H4He potentials with forbidden states and tensor component which correctly reproduce scattering phase shift at low energies is offered. On the basis these interactions in a two - cluster model it is possible to describe all main characteristics of a 6Li nucleus bound state, including a sign and value of a quadrupole moment.
description: 7 pages, 5 figures, 22 references
Joint resummation of two angularities at next-to-next-to-leading logarithmic order
Creators: name: Procura, Massimiliano
name: Waalewijn, Wouter J.
name: Zeune, Lisa
Publisher: name: arXiv
Year: 2018
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Multivariate analyses are emerging as important tools to understand properties of hadronic jets which play a key role in the LHC experimental program. We take a first step towards precise and differential theory predictions by calculating the cross section for $e^+ e^- \to$ 2 jets differential in the angularities $e_α$ and $e_β$. The logarithms of $e_α$ and $e_β$ in the cross section are jointly resummed to next-to-next-to-leading logarithmic accuracy, using the SCET+ framework we developed, and are matched to the next-to-leading order cross section. We perform analytic one-loop calculations that serve as input for our numerical analysis, provide controlled theory uncertainties, and compare our results to Pythia. We also obtain predictions for the cross section differential in the ratio $e_α/e_β$, which cannot be determined from a fixed-order calculation. The effect of nonperturbative corrections is also investigated. Using Event2, we validate the logarithmic structure of the single angularity cross section predicted by factorization theorems at ${\mathcal O}(α_s^2)$, demonstrating that for specific angularities recoil must be taken into account when using the thrust axis, while it can be ignored if these are measured with respect to the winner-take-all axis.
description: 40 pages, 13 figures. v3: fixed a few minor typos
Bifurcations of Set-Valued Dynamical Systems
Creators: name: Athorne, Alexander
Publisher: name: Imperial College London
Year: 2017

description: We study families of set-valued dynamical systems and show how minimal invariant sets depend on parameters. We give a variant on the definition of attractor repeller pairs and obtain a different version of the Conley decomposition theorem. Under mild conditions on these systems we show that minimal invariant sets are related to a variation on the definition of chain components we call orbitally connected sets. We show for such systems that bifurcations can occur as a result of two orbitally connected sets colliding.
Impact of the ionoSolv process on cellulose quality and cellulose-derived materials
Creators: name: Tu, Wei-Chien
Publisher: name: Imperial College London
Year: 2019

description: This thesis is concerned with the valorization of the cellulose pulps produced using the ionoSolv pretreatment process. Experiments using both fresh and recycled ionic liquid, specifically triethylammonium hydrogen sulfate [TEA][HSO4], were conducted. Characterization of the isolated pulps was used to demonstrate the chemical and morphological effects of the ionoSolv pretreatment process on cellulose. Recycled ionic liquid contains solutes that impact the mechanism for lignocellulose biomass fractionation affecting the optimal pretreatment conditions. Pulp yields were consistently lower (demonstrating better pretreatment extraction, the pulps have a higher glucan content) and saccharification results were better when using recycled ionic liquid, demonstrating that the presence of these solute improved lignin extraction. In addition, it is demonstrated that protic ionic liquid pretreatment will eventually generate humins and pseudolignin, which are undesirable by-products of carbohydrate conversion which reduce saccharification yields and pulp purity. Experiments were conducted by doping the ionic liquid with 13C labelled and unlabeled sugars and their derivatives to ascertain the role of these solutes in the formation or prevention of pseudo-lignin formation. The re-deposition of these compounds onto the pulp is directly impacted by the purity of the pulp surface. The use of recycled ionic liquid in combination with additives such as HMF demonstrated a moderating effect on the formation of pseudolignin and humic compounds by increasing their solubility in the ionic liquid, preventing their re-deposition onto the surface of the pulp during pretreatment. In addition, lignin recovered from the pretreatment suggests the incorporation of carbohydrates, with lignin produced using recycled ionic liquid having higher molecular weights. The pulps produced during the pretreatment were submitted to subsequent processing to demonstrate additional potential value streams. Pulps were bleached to produce cellulose fibers and nanocellulose crystals. Fiber analysis suggests the pulps are of sufficient quality for materials production and various other industrial applications.
Resummed spinning waveforms from five-point amplitudes
Creators: name: Brandhuber, Andreas
name: Brown, Graham R.
name: Chen, Gang
name: Gowdy, Joshua
name: Travaglini, Gabriele
Publisher: name: arXiv
Year: 2023
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We compute the classical tree-level five-point amplitude for the two-to-two scattering of spinning celestial objects with the emission of a graviton. Using this five-point amplitude, we then turn to the computation of the leading-order time-domain gravitational waveform. The method we describe is suitable for arbitrary values of classical spin of Kerr black holes and does not require any expansion in powers of the spin. In this paper we illustrate it in the simpler case of the scattering of one Kerr and one Schwarzschild black hole. An important ingredient of our calculation is a novel form of the Compton amplitude with spinning particles including contact terms derived from matching to black-hole perturbation theory calculations. This ensures that our waveform is valid up to at least fourth order in the spin. Our method can be applied immediately to generate improved waveforms once higher-order contact terms in the Compton amplitude become available. Finally, we show the formula for the gravitational memory to all orders in the spin, which is in agreement with our results.
description: 53 pages, 6 figures. v3: JHEP version, typos corrected, references added
The form of cosmic string cusps
Creators: name: Blanco-Pillado, J. J.
name: Olum, Ken D.
Publisher: name: arXiv
Year: 1998
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We classify the possible shapes of cosmic string cusps and how they transform under Lorentz boosts. A generic cusp can be brought into a form in which the motion of the cusp tip lies in the plane of the cusp. The cusp whose motion is perpendicular to this plane, considered by some authors, is a special case and not the generic situation. We redo the calculation of the energy in the region where the string overlaps itself near a cusp, which is the maximum energy that can be released in radiation. We take into account the motion of a generic cusp and the resulting Lorentz contraction of the string core. The result is that the energy scales as $\sqrt {rL}$ instead of the usual value of $r^{1/3} L^{2/3}$, where $r$ is the string radius and $L$ and is the typical length scale of the string. Since $r << L $ for cosmological strings, the radiation is strongly suppressed and could not be observed.
description: 14 pages, ReVTex, 2 postscript figures with epsf. v2: correct exponents in (33cd), additional material in intro
Toward the synthesis of 1′E-isomer of ent-hyptenolide
Creators: name: Purushotham Reddy Karra
name: Sabitha Gowravaram
Publisher: name: Taylor & Francis
Year: 2018
Subjects: subject: Biophysics
subject: Biochemistry
subject: 29999 Physical Sciences not elsewhere classified
subject: FOS: Physical sciences
subject: Cell Biology
subject: Pharmacology
subject: Biotechnology
subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: 80699 Information Systems not elsewhere classified
subject: FOS: Computer and information sciences
subject: Plant Biology
subject: FOS: Biological sciences
subject: Computational Biology

description: A short total synthesis of a diacetoxylated E,E-diene lactone ent-hyptenolide, was achieved involving from Phosphonate and cis-butene 1,4-diol. Brown Asymmetric allylation, Acrylation, Acetylation, Ring-closing metathesis as the key steps has been described. Moreover, the biological activity of ent-hyptenolide was evaluated on HeLa, A549, IMR32, and MDA-MB231 cancer cell lines. The ent-hyptenolide selectively and potently inhibited the growth of IMR32 cell line.
Hund nodal line semimetals: The case of twisted magnetic phase in the double-exchange model
Creators: name: Geilhufe, R. Matthias
name: Guinea, Francisco
name: Juricic, Vladimir
Publisher: name: arXiv
Year: 2018
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We propose a class of topological metals, which we dub \emph{Hund nodal line semimetals}, arising from the strong Coulomb interaction encoded in the Hund's coupling between itinerant electrons and localized spins. We here consider a particular twisted spin configuration, which is realized in the double exchange model which describes the manganite oxides. The resulting effective tetragonal lattice of electrons with hoppings tied to the local spin features an antiunitary \emph{non-symmorphic} symmetry that in turn, together with another non-symmorphic but unitary, glide mirror symmetry, protects crossings of a double pair of bands along a high-symmetry line on the Brillouin zone boundary. We also discuss symmetry breaking arising from various perturbations of the twisted phase. Our results may motivate further studies of other realizations of this state of matter, for instance in different spin backgrounds, properties of its drumhead surface states, as well as its stability to disorder and interactions among the itinerant electrons.
description: 6 pages, 4 figures, published version
Damage mechanisms of biological crossed-lamellar microstructures applied to high-performance carbon-fibre and hybrid composites
Creators: name: Häsä, Riikka
Publisher: name: Imperial College London
Year: 2019

description: The ability of components to preserve their structural integrity and diffuse damage under stable conditions is paramount for various applications in the automotive and aerospace industries. At the same time, requirements for weight savings have driven these industries towards extensive use of Carbon Fibre Reinforced Polymers (CFRPs) that have high specific strength and stiffness. However, CFRPs are inherently brittle and suffer from low damage tolerance, which has been identified as the main limitation for their use. Recent research has shown that these seemingly contradictory design requirements can be met through careful microstructural design. Natural composites have proven an excellent source of inspiration for new microstructures, as they typically retain their structural integrity under the attacks of predators despite their weak and brittle main constituents. In particular, the crossed-lamellar microstructure, found in many mollusc shells, exhibits remarkable damage behaviour due to its complex microstructure, leading to torturous cracks paths through various damage diffusion mechanisms. In this work, we design, prototype and test CFRPs with a crossed-lamellar microstructure. First, the feasibility of such microstructure in CFRP is studied using a parametric unit cell Finite Element (FE) model, and prototyping procedures for such microstructure are subsequently developed. Experimental characterisation of the failure mechanisms of the microstructures shows that the toughening mechanisms of the natural crossed-lamellar microstructure can be reproduced in CFRP. To further improve damage diffusion in the microstructure, hybrid metal/crossed lamellar composites are conceived and tested. The results show that such composites diffuse damage under stable conditions up to record large curvatures, while also retaining their structural integrity. Finally, we investigate metal/crossed-lamellar composites with in-plane fibres to improve the stiffness and strength of the microstructures. These composites are able to resist separation into several pieces upon bending, thus providing an attractive alternative for applications that need to retain their structural integrity against penetration damage.
title: ADCO, Troisième cartulaire de Saint-Étienne de Dijon (XVIe), Cart. 23 (G 127), 310 folios, f. 00389
Creators: name: de la Côte d'Or, Archives départementales
name: Archives Départementales De La Côte-D'Or
name: Petot, Frédérique
name: Projet CBMA
name: CG21/F.PETOT/2011
name: Petot, Frédéric
Publisher: name: NAKALA - https://nakala.fr (Huma-Num - CNRS)
publisherIdentifier: https://ror.org/04ces3204
publisherIdentifierScheme: ROR
Year: 2020
Subjects: subject: cartulaire
subject: Corpus Burgundiae Medii Aevi
subject: Chartes de la Bourgogne du Moyen Âge
subject: LaMOP
subject: Laboratoire de Médiévistique Occidentale de Paris

description: Troisième cartulaire de Saint-Étienne de Dijon (XVIe), Archives départementales de la Côte-d'Or, Cart. 23 (G 127), 310 folios, f. 00389, Numérisation en mode image.
description: Relation: http://www.cbma-project.eu/
description: Bibliographic citation: Troisième cartulaire de Saint-Étienne de Dijon (XVIe), Archives départementales de la Côte-d'Or, Cart. 23 (G 127), 310 folios, f. 00389, in Projet CBMA - Corpus Burgundiae Medii Aevi [Ressource en ligne], https://manuscrits.cbma-project.eu/
description: Provenance: abbaye Saint-Étienne de Dijon
description: Provenance: http://www.wikidata.org/entity/Q15945019
Electronic Structure, Correlation Effects and Physical Properties of d- and f-Metals and Their Compounds
Creators: name: Irkhin, V. Yu.
name: Irkhin, Yu. P.
Publisher: name: arXiv
Year: 1998
Subjects: subject: Condensed Matter (cond-mat)
subject: FOS: Physical sciences

description: The book includes all main physical properties of d- and f-transition-metal systems and corresponding theoretical concepts. Especial attention is paid to the theory of magnetism and transport phenomena. Some examples of non-traditional questions which are treated in detail in the book: the influence of density of states singularities on electron properties; many-electron description of strong itinerant magnetism; mechanisms of magnetic anisotropy; microscopic theory of anomalous transport phenomena in ferromagnets. Besides considering classical problems of solid state physics as applied to transition metals, modern developments in the theory of correlation effects in d- and f-compounds are considered within many-electron models. The book contains, where possible, a simple physical discussion. More difficult questions are considered in Appendices.
description: TeX files of the text of the book, style is enclosed, reference to draft figures in gif format is added which can be found in the /figs directory of the source or at http://www1.imp.uran.ru/ktm_lab/book/
Action of Weyl group on zero weight space
Creators: name: Floch, Bruno Le
name: Smilga, Ilia
Publisher: name: arXiv
Year: 2018
Subjects: subject: Representation Theory (math.RT)
subject: Group Theory (math.GR)
subject: FOS: Mathematics
subject: 17B10, 17B20, 22E46, 22E47

description: For any simple complex Lie group we classify irreducible finite-dimensional representations $ρ$ for which the longest element $w_0$ of the Weyl group acts nontrivially on the zero weight space. Among irreducible representations that have zero among their weights, $w_0$ acts by $\pm$Id if and only if the highest weight of $ρ$ is a multiple of a fundamental weight, with a coefficient less than a bound that depends on the group and on the fundamental weight.
description: 20 pages. This version has two appendixes that did not appear in the published version. The first appendix contains the full list of the results of the computations done "by hand", and the second appendix contains the computer code used to do these computations
Modelling of multicomponent reactive transport on pore space images
Creators: name: Serafini De Oliveira, Thomas David
Publisher: name: Imperial College London
Year: 2018

description: We present a new model to simulate multispecies reactive transport on pore space images. We solve the Navier-Stokes equations and the advection-diffusion equation for concentration fields on an unstructured grid using the finite volume method. We couple it with the chemical model Reaktoro, which we use to calculate the chemical equilibrium in each grid cell, considered as a completely mixed batch reactor. We validate the model against analytical solutions and experimental data, and investigate, for a range of Péclet numbers, the interplay between transport and reaction for multispecies reactive transport in a 3D bead pack where two streams of reactants at different pH are injected in parallel. We analyse the distribution of species and the rates of formation and consumption and find that, despite the relative homogeneity of the bead pack, the concentration fields of the products can be asymmetric because of the interplay between transport and chemical equilibrium. We observe that lower Péclet numbers give rise to higher relative yields because of increased transverse mixing by diffusion. However, higher absolute yields are obtained at higher injection velocities because of larger amount of matter available for reaction. Reaction is more favoured in the faster-flowing regions. However, this effect is more marked for species for which advection is the dominant mechanism of transport to reactive sites, as opposed to diffusion-mediated reactions where the full velocity distribution is sampled before reaction occurs. Furthermore, we study multispecies mixing and reaction in a more heterogeneous carbonate sample. We use a micro-CT image of Portland limestone containing both macroporosity resolved at the image resolution, and sub-resolution microporosity which is quantified using difference imaging. We extend our solver to accommodate transport and reaction in microporous regions. We demonstrate how the highly variable flow field in carbonate allows reactants and products to disperse more rapidly compared to the more homogeneous bead pack, resulting in a highly non-uniform reaction rate and concentration distribution. This is due to a complex interplay between advection-dominated flow and reaction in the connected fast-flowing macroporous regions, and diffusion-mediated transport and reaction in microporosity. Multispecies mixing and reaction in natural rocks are much more complex than hitherto observed, which needs to be considered in reactive transport studies at different length-scales. Finally, we test the applicability of our code to study dissolution. We first validate our code on multispecies dissolution of a single sphere and a semi-infinite solid. Then, we study dissolution on a micro-CT image composed of dolomite and calcite in ratio 10:1. We find that fast channels are strongly associated with dissolved dolomite, high concentrations of reactants, and low concentrations of products.
On Galois groups and PAC substructures
Creators: name: Hoffmann, Daniel Max
Publisher: name: arXiv
Year: 2018
Subjects: subject: Logic (math.LO)
subject: FOS: Mathematics
subject: Primary 03C50, Secondary 03C45, 03C95

description: We show that for an arbitrary stable theory T, a group G is profinite if and only if G occurs as a Galois group of some Galois extension inside a monster model of T. We prove that any PAC substructure of the monster model of T has projective absolute Galois group. Moreover, any projective profinite group G is isomorphic to the absolute Galois group of some substructure P of the monster model. If T is omega-stable, then P can be chosen to be PAC. Finally, we provide a description of some Galois groups of existentially closed substructures with G-action in the terms of the universal Frattini cover. Such structures might be understood as a new examples of PAC structures.
The solar wind in the inner heliosphere
Creators: name: Stansby, David
Publisher: name: Imperial College London
Year: 2019

description: The solar wind is a sparse and hot plasma, flowing from the surface of the Sun to the edge of the heliosphere. Our best knowledge of the solar wind close to the Sun comes from the two Helios spacecraft launched in the 1970s, but this will soon be joined by data from Parker Solar Probe and Solar Orbiter. This thesis re-visits in situ measurements of the solar wind taken by Helios in preparation for these new missions. Measurements of solar wind protons and alpha particles taken by Helios are re-analysed to extract the thermal anisotropy of the particle distribution functions. The new dataset is used to investigate three areas of solar wind formation and evolution. The properties of number density structures inside 1 AU located away from the heliospheric current sheet are investigated and shown to account for < 1% of the solar wind. Their use as tracers of the ambient solar wind speed is validated, and 90% of the structures detected are shown quantitively to be too small to be detected in existing remote sensing images. A new solar wind source identification scheme is constructed for in situ measurements made inside 1 AU, with distinct solar wind sources classified into three categories based on proton temperature anisotropy and Alfvénicity. This categorisation scheme is used to demonstrate that the traditional categories of slow and fast solar wind do not map well to distinct solar sources. The radial evolution of alpha particle temperatures inside 1 AU is presented. Alpha particles are found to undergo heating in the magnetic field parallel direction, and cooling in the magnetic field parallel direction during propagation. This is shown to be at least due to the influence of temperature anisotropy instabilities. These results also imply that alpha particles are heated in the perpendicular direction below 0.3 AU.
Chiral Active Particles are Sensitive Reporter to Environmental Geometry
Creators: name: Chan, Chung Wing
name: Wu, Daihui
name: Qiao, Kaiyao
name: Fong, Kin Long
name: Yang, Zhiyu
name: Han, Yilong
name: Zhang, Rui
Publisher: name: arXiv
Year: 2023
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: Chiral active particles (CAPs) are self-propelling particles that break time-reversal symmetry by orbiting or spinning, leading to intriguing behaviors. Here, we examined the dynamics of CAPs moving in 2D lattices of disk obstacles through active Brownian dynamics simulations and granular experiments with grass seeds. We find that the effective diffusivity of the CAPs is sensitive to the structure of the obstacle lattice, a feature absent in achiral active particles. We further studied the transport of CAPs in obstacle arrays under an external field and found a reentrant directional locking effect, which can be used to sort CAPs with different activities. Finally, we demonstrated that the parallelogram lattice of obstacles without mirror symmetry can separate clockwise and counter-clockwise CAPs. The mechanisms of the above three novel phenomena are qualitatively explained. As such, our work provides a basis for designing chirality-based tools for single-cell diagnosis and separation, and active particle-based environmental sensors.
Motacilla pendulinus Linnaeus, 1758, spec. nov.
Creators: name: Linnaeus, Carolus
Publisher: name: Laurentius Salvius
Year: 1758
Subjects: Biodiversity
Taxonomy
Animalia
Chordata
Aves
Passeriformes
Motacillidae
Motacilla
Motacilla pendulinus

description: Motacilla pendulinus [spec. nov.]
M. capite ferrugineo, macula nigra oculari, remigibus rectricibusque fuscis margine utroque ferrugineis.
Lanius minimus. Edw. av. 55. t. 55.
Parus montanus. Alb. av. 3. p. 53. t. 59.
Parus minimus Remiz. Titius Lips. 1755. dissertatio.
Parus lithuanicus nidum suspendens. Klein. av. 86.
Pendulinus. Act. Bonon. 2. 2. p. 57. t. 7.
Remiz. Rhaczynsk. polon. 1. p. 294.
Habitat in Polonia, Lithuania, Hungaria, Italia, missa a D D. Montio.
description: Published as part of Linnaeus, Carolus, 1758, Systema Naturae per regna tria naturae: secundum classes, ordines, genera, species, cum characteribus, differentiis, synonymis, locis, Stockholm :Laurentius Salvius on page 189, DOI: 10.5962/bhl.title.542, http://zenodo.org/record/3922206
Reducing Richtmyer Meshkov Instability Jet Velocity via Inverse Design
Creators: name: Kline, Dylan J.
name: Hennessey, Michael P.
name: Amondson, David K.
name: Lin, Steve
name: Grapes, Michael D.
name: Ferrucci, Massimiliano
name: Li, Peggy
name: Springer, H. Keo
name: Reeves, Robert V.
name: Sullivan, Kyle T.
name: Belof, Jonathan L.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Applied Physics (physics.app-ph)
subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: In this work, we detail a novel application of inverse design and advanced manufacturing to rapidly develop and experimentally validate modifications to a shaped charge jet analogue. The shaped charge jet analogue comprises a conical copper liner, high explosive (HE), and silicone buffer. We apply a genetic algorithm to determine an optimal buffer design that can be placed between the liner and the HE that results in the largest possible change in jet velocity. The use of a genetic algorithm allows for discoveries of unintuitive, complex, yet optimal buffer designs. Experiments using the optimal design verified the effectiveness of the buffer and validated the modeling.
Process integration and steam production in industrial processes
Creators: name: Alonso, Laura
Publisher: name: Zenodo
Year: 2023

description: The use of steam is widespread in many industrial processes, being used in many different sectorsand for a variety of purposes. The development of Heat Upgrade Technologies (HUTs), which candeliver steam, can contribute to the decarbonization of the industry, and research efforts in thisfield have been increasing in the last few years. There are different possibilities for producingsteam with HUTs, this will be demonstrated in the PUSH2HEAT project, integrating different HUTsin demonstration sites producing steam. This report presents a general overview of steamgeneration, distribution, and use in the industry, its use in different industrial sectors, and the statusof steam-generating Heat Upgrade Technologies.

In Section 2, a general view of steam generation, distribution, and use in the industry is presented.The equipment and elements normally used in steam installations are described, and someenergy efficiency measures in steam generation and distribution systems are presented.This section also describes some processes that use steam in different sectors: paper, chemical,food & beverage, oil & gas, carbon capture, etc.

Section 3 provides an overview of how steam can be produced with Heat Upgrade Technologies(HUT). State-of-the-art of steam-generating heat pumps and heat transformers are presented.Also, the methods of producing steam with those HUTs are explained, differentiating betweenindirect (externally from the HUT) and direct (directly inside the HUT) steam generation. Thenecessary equipment for steam generation with HUTs is described. Finally, the challenges ofsteam-generating HUTs and their integration into the processes are presented.

Section 4 discusses the process integration methods, focused on integrating HUTs within theindustry.