cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
From Canonical to Enhanced Extra Mixing in Low-Mass Red Giants: Tidally Locked Binaries
Creators: name: Denissenkov, Pavel
name: Chaboyer, Brian
name: Li, Ke
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Stellar models which incorporate simple diffusion or shear induced mixing are used to describe canonical extra mixing in low mass red giants of low and solar metallicity. These models are able to simultaneously explain the observed Li and CN abundance changes along upper red giant branch (RGB) in field low-metallicity stars and match photometry, rotation and carbon isotopic ratios for stars in the old open cluster M67. The shear mixing model requires that main sequence (MS) progenitors of upper RGB stars possessed rapidly rotating radiative cores and that specific angular momentum was conserved in each of their mass shells during their evolution. We surmise that solar-type stars will not experience canonical extra mixing on the RGB because their more efficient MS spin-down resulted in solid-body rotation, as revealed by helioseismological data for the Sun. Thus, RGB stars in the old, high metallicity cluster NGC 6791 should show no evidence for mixing in their carbon isotopic ratios. We develop the idea that canonical extra mixing in a giant component of a binary system may be switched to its enhanced mode with much faster and somewhat deeper mixing as a result of the giant's tidal spin-up. This scenario can explain photometric and composition peculiarities of RS CVn binaries. The tidally enforced enhanced extra mixing might contribute to the star-to-star abundance variations of O, Na and Al in globular clusters. This idea may be tested with observations of carbon isotopic ratios and CN abundances in RS CVn binaries.
description: 47 pages, 19 figures, accepted for publication in ApJ
Anderson localization transition in a robust $\mathcal{PT}$-symmetric phase of a generalized Aubry-Andre model
Creators: name: Schiffer, Sebastian
name: Liu, Xia-Ji
name: Hu, Hui
name: Wang, Jia
Publisher: name: arXiv
Year: 2020
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Quantum Gases (cond-mat.quant-gas)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We study a generalized Aubry-Andre model that obeys $\mathcal{PT}$-symmetry. We observe a robust $\mathcal{PT}$-symmetric phase with respect to system size and disorder strength, where all eigenvalues are real despite the Hamiltonian being non-hermitian. This robust $\mathcal{PT}$-symmetric phase can support an Anderson localization transition, giving a rich phase diagram as a result of the interplay between disorder and $\mathcal{PT}$-symmetry. Our model provides a perfect platform to study disorder-driven localization phenomena in a $\mathcal{PT}$-symmetric system.
Topological phases, van Hove singularities, and spin texture in magic-angle twisted bilayer graphene in the presence of proximity-induced spin-orbit couplings
Creators: name: Tan, Yuting
name: Chou, Yang-Zhi
name: Wu, Fengcheng
name: Sarma, Sankar Das
Publisher: name: arXiv
Year: 2024
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We investigate magic-angle twisted bilayer graphene (MATBG) with proximity-induced Ising and Rashba spin-orbit couplings (SOC) in the top layer, as recently achieved experimentally. Utilizing the Bistritzer-MacDonald model with SOCs, we reveal a rich single-particle topological phase diagram featuring topological flat bands across different twist angles and interlayer hopping energies. The evolution of Dirac cones and Chern numbers is examined to understand the topological phase transitions. We find that all phases can be achieved with an experimentally accessible SOC strength ($\sim$1 meV) in systems with angles very close to the magic angle. Furthermore, the van Hove singularity for each topological flat band splits in the presence of SOC, significantly altering the electronic properties. Additionally, we investigate the spin textures of each band in momentum space, discovering a skyrmion-like spin texture in the center of the moiré Brillouin zone, which is correlated with the topological phase transitions and can be tuned via the SOCs and an out-of-plane electric field. Our findings provide a comprehensive understanding of the topological flat bands, establishing a foundation for grasping the intrinsic and rich roles of SOCs in MATBG.
description: 19 pages, 20 figures
Pion crystals hosting topologically stable baryons
Creators: name: Canfora, Fabrizio
name: Carignano, Stefano
name: Lagos, Marcela
name: Mannarelli, Massimo
name: Vera, Aldo
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Quantum Gases (cond-mat.quant-gas)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We construct analytic (3+1)-dimensional inhomogeneous and topologically non-trivial pion systems using chiral perturbation theory. We discuss the effect of isospin asymmetry with vanishing electromagnetic interactions as well as some particular configurations with non-vanishing electromagnetic interactions. The inhomogeneous configurations of the pion fields are characterized by a non-vanishing topological charge that can be identified with baryons surrounded by a cloud of pions. This system supports a topologically protected persistent superflow. When the electromagnetic field is turned on the superflow corresponds to an electromagnetic supercurrent.
description: v2: extended discussion and added references; matches published version on Physical Review D
Brief an Philip A. Potter zum 60. Geburtstag - 19. August 1981
Creators: name: Simpfendörfer, Werner
Publisher: name: Ökumenische Rundschau
Year: 2025

description: Ökumenische Rundschau, Bd. 30 Nr. 4 (1981): Ökumenische Rundschau, Band 30, Heft 4
Production of cold formaldehyde molecules for study and control of chemical reaction dynamics with hydroxyl radicals
Creators: name: Hudson, Eric R.
name: Ticknor, Christopher
name: Sawyer, Brian C.
name: Taatjes, Craig A.
name: Lewandowski, H. J.
name: Bochinski, J. R.
name: Bohn, John L.
name: Ye, Jun
Publisher: name: arXiv
Year: 2005
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: We propose a method for controlling a class of low temperature chemical reactions. Specifically, we show the hydrogen abstraction channel in the reaction of formaldehyde (H$_{2}$CO) and the hydroxyl radical (OH) can be controlled through either the molecular state or an external electric field. We also outline experiments for investigating and demonstrating control over this important reaction. To this end, we report the first Stark deceleration of the H$_{2}$CO molecule. We have decelerated a molecular beam of H$_{2}$CO essentially to rest, producing cold molecule packets at a temperature of 100 mK with a few million molecules in the packet at a density of $\sim10^{6}$ cm$^{-3}$.
Subdiffusion of heavy quark in hot QCD matter by the fractional Langevin equation
Creators: name: Prakash, Jai
Publisher: name: arXiv
Year: 2024
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The subdiffusion phenomena are studied for heavy quarks dynamics in the hot QCD matter. My approach aims to provide a more realistic description of heavy quark dynamics through detailed theoretical analyses and numerical simulations, utilizing the fractional Langevin equation framework with the Caputo fractional derivative. I present numerical schemes for the fractional Langevin equation for subdiffusion and calculate the time evolution mean squared displacement and mean squared momentum of the heavy quarks. My results indicate that the mean squared displacements of the heavy quarks for the subdiffusion process deviate from a linear relationship with time. Further, I calculate the normalized momentum correlation function, kinetic energy, and momentum spread. Finally, I show the effect of subdiffusion on experimental observables, the nuclear modification factor.
description: Published in PHYSICAL REVIEW C
Magnon-assisted photon-phonon conversion in the presence of the structured environments
Creators: name: Qi, Shi-fan
name: Jing, Jun
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Quantum conversion or interface is one of the most prominent protocols in quantum information processing and quantum state engineering. We propose a photon-phonon conversion protocol in a hybrid magnomechanical system comprising a microwave optical mode, a driven magnon mode and a mechanical-vibrating mode. The microwave photons in the optical cavity are coupled to the magnons by the magnetic-dipole interaction, and the latter are coupled to the mechanical phonons by the magnetostrictive interaction. With strong photon-magnon interaction and strong driving on magnon, an effective Hamiltonian is constructed to describe the conversion between photons and phonons nearby their resonant point. The cavity-magnon system can then play the role of a quantum memory. Moreover, the faithfulness of the photon-phonon conversion is estimated in terms of fidelities for state evolution and state-independent transfer. The former is discussed in the Lindblad master equation taking account the leakages of photon, phonon and magnon into consideration. The latter is derived by the Heisenberg-Langevin equation considering the non-Markovian noise from the structured environments for both optical and mechanical modes. The state-evolution fidelity is found to be robust to the weak leakage. The transfer fidelity can be maintained by the Ohmic and sub-Ohmic environments of the photons and is insensitive to the $1/f$ noise of the phonons. Our work thus provides an interesting application for the magnon system as a photon-phonon converter in the microwave regime.
Simple examples of position-momentum correlated Gaussian free-particle wavepackets in one-dimension with the general form of the time-dependent spread in position
Creators: name: Robinett, R. W.
name: Doncheski, M. A.
name: Bassett, L. C.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We provide simple examples of closed-form Gaussian wavepacket solutions of the free-particle Schrodinger equation in one dimension which exhibit the most general form of the time-dependent spread in position, namely (Delta x_t)^2 = (Delta x_0)^2 + At + (Delta p_0)^2t^2/m^2, where A = _0)(phat - _0) + (phat - _0)(xhat - _0)>_0 contains information on the position-momentum correlation structure of the initial wave packet. We exhibit straightforward examples corresponding to squeezed states, as well as quasi-classical cases, for which A < 0 so that the position spread can (at least initially) decrease in time because of such correlations. We discuss how the initial correlations in these examples can be dynamically generated (at least conceptually) in various bound state systems. Finally, we focus on providing different ways of visualizing the x-p correlations present in these cases, including the time-dependent distribution of kinetic energy and the use of the Wigner quasi-probability distribution. We discuss similar results, both for the time-dependent Delta x_t and special correlated solutions, for the case of a particle subject to a uniform force.
description: 25 pages, 2 embedded postscript figures
On quantum non-signalling boxes
Creators: name: Piani, M.
name: Horodecki, M.
name: Horodecki, P.
name: Horodecki, R.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: A classical non-signalling (or causal) box is an operation on classical bipartite input with classical bipartite output such that no signal can be sent from a party to the other through the use of the box. The quantum counterpart of such boxes, i.e. completely positive trace-preserving maps on bipartite states, though studied in literature, have been investigated less intensively than classical boxes. We present here some results and remarks about such maps. In particular, we analyze: the relations among properties as causality, non-locality and entanglement; the connection between causal and entanglement breaking maps; the characterization of causal maps in terms of the classification of states with fixed reductions. We also provide new proofs of the fact that every non-product unitary transformation is not causal, as well as for the equivalence of the so-called semicausality and semilocalizability properties.
description: 18 pages, 7 figures, revtex4
Enumeration of perfect matchings of a type of Cartesian products of graphs
Creators: name: Yan, Weigen
name: Zhang, Fuji
Publisher: name: arXiv
Year: 2005
Subjects: subject: Combinatorics (math.CO)
subject: FOS: Mathematics
subject: 05C70; 05C90

description: Let $G$ be a graph and let Pm$(G)$ denote the number of perfect matchings of $G$. We denote the path with $m$ vertices by $P_m$ and the Cartesian product of graphs $G$ and $H$ by $G\times H$. In this paper, as the continuance of our paper [19], we enumerate perfect matchings in a type of Cartesian products of graphs by the Pfaffian method, which was discovered by Kasteleyn. Here are some of our results: 1. Let $T$ be a tree and let $C_n$ denote the cycle with $n$ vertices. Then Pm$(C_4\times T)=\prod (2+α^2)$, where the product ranges over all eigenvalues $α$ of $T$. Moreover, we prove that Pm$(C_4\times T)$ is always a square or double a square. 2. Let $T$ be a tree. Then Pm$(P_4\times T)=\prod (1+3α^2+α^4)$, where the product ranges over all non-negative eigenvalues $α$ of $T$. 3. Let $T$ be a tree with a perfect matching. Then Pm$(P_3\times T)=\prod (2+α^2),$ where the product ranges over all positive eigenvalues $α$ of $T$. Moreover, we prove that Pm$(C_4\times T)=[{Pm}(P_3\times T)]^2$.
description: 15 pages, 4 figures
Mapping benthic reef habitats in the shallow waters of the Kepulauan Seribu
Creators: name: Syamsul Bahri Agus
name: Adriani Sunuddin
Publisher: name: F1000Research
Year: 2015

description: Habitat maps of coastal and shallow marine waters provide essential information for sound conservation efforts and effective reef fisheries management. Patch reef complex of Kepulauan Seribu harbor diverse marine habitats and support a number of human activities with direct and indirect effects to important reef resources and alarming the proficiency of environmental services vital to coastal communities living therein. The purpose of this study was to map critical habitats in the shallow marine waters of Kepulauan Seribu, in particular Panggang Island Municipality, utilizing high resolution satellite imagery, WorldView-2. Image processing analyses were composed of atmospheric and radiometric correction, orthorectification, image enhancement, land and deep water masking, also glint correction. Combined supervised/unsupervised classification was applied to produce nine classes of reef benthic habitat: coral reef, coral-rubble, rubble-algae, rubble-sand, sand-rubble-algae-seagrass, sand-coral-rubble-algae, dense seagrass, sparse seagrass, and sand. Different types of benthic habitats exist in the reefscape with patchy distribution, particularly in the reef flat where a minimum of four habitat classes were intermingled. Groundtruthing and validation of classified habitats was conducted using dive observation, thus confirms methodical approach applied to produce synoptic and accurate representation of shallow benthic habitats in the Kepulauan Seribu.
AGRICULTURAL COOPERATIVE ENTERPRISE IN THE TRANSITION FROM SOCIALIST COLLECTIVE FARMING
Creators: name: Gardner, Bruce L.
name: Lerman, Zvi
name: Gardner, Bruce L.
name: Lerman, Zvi
Publisher: name: Unknown
Year: 2006
Subjects: Agribusiness

description: Cooperative enterprise has appeal as a means of filling gaps in the economic institutions of the rural sectors of the transition economies of Central and Eastern Europe and the former Soviet Union. But in addition to problems that have faced cooperatives in the West because of their inherent characteristics, the Soviet-era legacy created cultural burdens that cooperatives will have to overcome. A review of countries’ experiences since 1989 indicates some commonalities in attempts to create “new cooperatives,” but also instructive differences across countries. The evidence so far is unfavorable for cooperatives in agricultural production. In marketing and input supply the current situation is more promising. In both production and marketing, the economic institutions remain in flux. Unique approaches involving cooperatives may take permanent root, but their long-term prospects are in doubt.
TURKMENISTAN'S NEW PRIVATE FARMERS: THE EFFECT OF HUMAN CAPITAL ON PERFORMANCE
Creators: name: Glukhikh, Rimma
name: Schwartz, Moshe
name: Lerman, Zvi
name: Glukhikh, Rimma
name: Schwartz, Moshe
name: Lerman, Zvi
Publisher: name: Unknown
Year: 2005
Subjects: Farm Management

description: Almost all former socialist countries are introducing private farming as part of land reform. In countries where such farming existed one or two generations ago, land might be restituted to former owners. In Turkmenistan, where there had been little private agriculture and no small landowners, land was distributed to new beneficiaries. This paper shows that the previous position of the new farm “owners” strongly affected what resources they had (land, capital, water) and how effectively they used them. The study is based on a survey conducted in 2000 on a sample of 143 farmers from Turkmenistan’s all five administrative regions. The farmers were divided for analysis into five categories, according to previous positions (managers, middle-level specialists, skilled and unskilled workers, and administrative staff). On the average, all categories of farmers turned a profit. However, the most successful were the middle-level specialists (agronomists, engineers). They had the largest plots, the best land, and the best-equipped farms. Like the managers and the administrative staff, they had savings, some of which they used as startup capital. They diversified their production more than others, and were better able to obtain credit. Former unskilled workers were the least successful, lacking capital, and unable to afford risks, thus growing only wheat and cotton at the expense of other crops and of livestock. Earlier studies have shown that former position affected the share of resources received by individuals in the ex Soviet Union. In addition to confirming the finding, we have shown that former position also affected the use of those resources, and the economic performance of the users. Unfortunately, the sample size was small, and our conclusions remain thus tentative.
Exploring ethnobotanical uses of the African flora for the search of target-based anti-cancer agents using mechanism-based assays
Creators: name: Fidele Ntie-Kang
name: Simoben, Conrad V.
name: Lifongo, Lydia L.
name: Judson, Philip N.
name: Mbaze, Luc Meva’a
name: Sippl, Wolfgang
Publisher: name: F1000Research
Year: 2015

description: Despite continuing scientific and commercial interests in cancer research around drug discovery, both developing and developed countries are still trapped in the grip of this deadly and dreadful disease. Naturally occurring compounds represent about half of the chemotherapeutic agents which have so far been put on the market for cancer treatment. In this study we have developed a new database (AfroCancer) comprising of ~ 400 compounds from African medicinal plants, which have shown in vitro and/or in vivo anti-cancer, cytotoxic and antiproliferative activities. Diversity analysis of the AfroCancer database has been carried out in comparison with known anti-cancer agents comprising ~ 1,500 published naturally occurring plant-based compounds from around the world, to show that the two data sets do not occupy the same chemical space. To demonstrate the potential utility of the database for in silico screening, the interactions between the compounds from the AfroCancer data base and selected anticancer drug targets have been analyzed by in silico modelling. Additionally, an in silico assessment of toxicity of the AfroCancer database was carried out with the use of eighty-eight (88) toxicity endpoints predicted by Lhasa’s expert knowledge-based system (Derek), showing that only an insignificant proportion of the promising anti-cancer agents could show high toxicity profiles.
The AMS-02 cosmic ray deuteron flux is consistent with a secondary origin
Creators: name: Yuan, Qiang
name: Fan, Yi-Zhong
Publisher: name: arXiv
Year: 2024
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The recent measurements of cosmic ray deuteron fluxes by AMS-02 show that the rigidity dependence of deuterons is similar with that of protons but flatter than $^3$He, which has been attributed to the existence of primary deuterons with abundance much higher than that from the Big Bang nucleosynthesis. The requirement of highly deuteron-abundant sources imposes a serious challenge on the modern astrophysics since there is no known process to produce a large amount of deuterons without violating other constraints \citep{1976Natur.263..198E}. In this work we demonstrate that the fragmentation of heavy nuclei up to nickel plays a crucial role in shaping/enhancing the spectrum/flux of the cosmic ray deuterons. Based on the latest cosmic ray data, the predicted secondary fluxes of deuterons and $^3$He are found to be reasonably consistent with the AMS-02 measurements and a primary deuteron component is not needed. The observed differences between the spectra of D and $^3$He, as well as those between the D/$^4$He (D/p) and $^3$He/$^4$He ($^3$He/p) flux ratios, measured in the rigidity space, is probably due to the kinetic-energy-to-rigidity conversion and the solar modulation, given different charge-to-mass ratios of D and $^3$He. More precise measurements of the fragmentation cross sections of various nuclei to produce deuterons, tritons, and $^3$He in a wide energy range will be very helpful in further testing the secondary origin of cosmic ray deuterons.
description: 14 pages, 8 figures, and 1 table; published in ApJL
Robbea bernarditae Scharhauser, Saavedra, Pröts, Ot, Geier, Gruber-Vodicka, Polikarpov, Bourenkov & Leisch, 2025, sp.nov.
Creators: name: Scharhauser, Florian
name: Saavedra, Daniel E. M.
name: Pröts, Philipp
name: Ot, Jörg A.
name: Geier, Benedikt
name: Gruber-Vodicka, Harald R.
name: Polikarpov, Maxim
name: Bourenkov, Gleb
name: Leisch, Nikolaus
Publisher: name: Zenodo
Year: 2024
Subjects: Biodiversity
Taxonomy
Animalia
Nematoda
Chromadorea
Desmodorida
Desmodoridae
Robbea
Robbea bernarditae

description: Robbea bernarditae sp.nov.
ZooBank registration: http://zoobank.org: urn:lsid:zoobank.org: act: 3585C810-E79D-4E8C-A534-B6FE6AB23F14.
Type location: Punta, BayBay, Leyte, Philippines; intertidal, fine sand next to mangrove stand. Coordinates: 10.642584 N, 124.774708 E.
Type material: One holotype (NHMW-ZOO-EV-M-5873), one paratype male (NHMW-ZOO-EV-M-5874). Collection date: June 1996. Collector: J.A. Ott.
Etymology: The species is dedicated to Bernardita Germano-Pilapil, former student of J.A. Ott, native of Leyte, Philippines, who helped with collection of specimens.
Description: With the characters of the genus. Measurements see Supporting Information, Table S2 (excel sheet).
Very small (<< 6 mm long) and rather stout species (Figures 12 and 13). Amphids more distinctly spiral than in other species. Males with prominent enlarged GSO in ventral post-pharyngeal region, protruding as 19 bumps. The species is remarkable for small (2 µm long) setae situated close to the submedian subcephalic setae. Cephalic capsule very long, extending over>70% of corpus. Long corpus occupies up to a third of pharynx length, large bulbus and consequently a very short isthmus (48–55% of pharynx length). Sparse somatic setae. Tail conical with rounded tip. Male testis with conspicuous large, round cells (sperm?). Symbiotic bacteria coccobacilli, 1.3 × 1 µm.
description: Published as part of Scharhauser, Florian, Saavedra, Daniel E. M., Pröts, Philipp, Ot, Jörg A., Geier, Benedikt, Gruber-Vodicka, Harald R., Polikarpov, Maxim, Bourenkov, Gleb & Leisch, Nikolaus, 2025, Revision of the genus Robbea (Stilbonematinae: Desmodoridae), worldwide abundant marine nematodes with chromophoric Fe-Br inclusions and the description of a new stilbonematine genus, pp. 1-28 in Zoological Journal of the Linnean Society 203 (1) on pages 8-9, DOI: 10.1093/zoolinnean/zlae005, http://zenodo.org/record/14850743
The Incidence and Economic Importance of the Entomofauna on the Growth and Production of Watermelon in Yagoua (Cameroon)
Creators: name: Michelson, Azo'o Ela
name: Monique, Ngapete Litassou
name: Pdagie, Djenatou
name: Stephanie, Kengni Beaudelaine
name: Derik, Sakata Pierre
name: Fernand-Nestor, Tchuenguem Fohouo
name: Michelson, Azo'o Ela
name: Monique, Ngapete Litassou
name: Pdagie, Djenatou
name: Stephanie, Kengni Beaudelaine
name: Derik, Sakata Pierre
name: Fernand-Nestor, Tchuenguem Fohouo
Publisher: name: Unknown
Year: 2021
Subjects: subject: Crop Production/Industries
subject: watermelon
subject: production
subject: pollinator
subject: pest
subject: natural enemy
subject: biocontrol agent

description: In the Far-North region of Cameroon, watermelon cultivation still faces several constraints that represent a major threat to fruit production. This requires research for maintaining and improving the crop yields. The present study was aimed at investigating the insect fauna associated with watermelon for its optimal management. Observations allowed the identification of insect-visiting fauna to the crop, to assess the role played by each species on growing watermelon, to evaluate the means of protection used by farmers and to make useful projections towards the biological control of the natural enemies of insect pests. Twenty two insect species visited the vegetative organs of watermelon. Fruit flies were found to be the most common and most damaging group for watermelon production. The larval stage of Syrphidae and adults of Coccinellidae and Formicidae were identified as important biocontrol agents. Watermelon requires effective phytosanitary cover for its optimal production. A non-significant fruit set rate was obtained between experimental treatments (T). The rate of mature fruit was zero in T0 which does not benefit from pollination and health care. Protective means used locally guaranteed the production of mature fruits by 24% in T1 without any sanitary care, 36% in T2 impregnated with neem Azadirachta indica (Meliaceae) leaf’s extract, and 54% in T3 treated with an insecticide named Optimal. Due to the strong involvement of chemicals in the protection of watermelon production at the study site, their use is often a problem for safeguarding the balance of the ecosystem and the health of farmers and consumers. It is therefore essential to promote the use of pollinators and to protect the natural enemies of insect pests to enhance sustainable production of watermelon in Yagoua.
Alloy Engineering of Polar (Si,Ge)2N2O System for Controllable Second Harmonic Performance
Creators: name: Kang, Lei
name: He, Gang
name: Zhang, Xinyuan
name: Li, Jiangtao
name: Lin, Zheshuai
name: Huang, Bing
Publisher: name: arXiv
Year: 2020
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Although silicon oxynitrides are important semiconductors for many practical applications, their potential second-order nonlinear optical (NLO) applications, regardless of balanced or controllable performance, have never been systemically explored. Using the first-principles calculations, in this article, we discover that the sinoite (i.e., typical silicon oxynitride Si2N2O) can simultaneously exhibit wide optical bandgap, strong second-harmonic generation (SHG) effect, and large birefringence, which are further confirmed by our preliminary experimental data. Importantly, we propose that alloying engineering can be further applied to control the balanced NLO properties in the Si2N2O system. Combining first-principles calculations and cluster expansion theory, we demonstrate that alloying Ge into Si2N2O can easily form low formation energy Si2(1-x)Ge2xN2O alloys, which can in turn achieve controllable phase-matching harmonic output with high SHG efficiency at different energy ranges. Therefore, alloy engineering could provide a unique approach to effectively control the balanced NLO performance of Si2(1-x)Ge2xN2O, making this polar alloy system holding potential applications in tunable laser frequency conversion and controllable all-optical devices.
description: 18 pages, 5 figures. Inorganic Chemistry, 2021
Two-fluid tokamak equilibria with reversed magnetic shear and sheared flow
Creators: name: Poulipoulis, G.
name: Throumoulopoulos, G. N.
name: Tasso, H.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: The aim of the present work is to investigate tokamak equilibria with reversed magnetic shear and sheared flow, which may play a role in the formation of internal transport barriers (ITBs), within the framework of two-fluid model. The study is based on exact self-consistent solutions in cylindrical geometry by means of which the impact of the magnetic shear, s, and the "toroidal" (axial) and "poloidal" (azimuthal) ion velocity components on the radial electric field, its shear and the shear of the ExB velocity is examined. For a wide parametric regime of experimental concern it turns out that the contributions of the toroidal and poloidal velocity and pressure gradient terms to the electric field, its shear and ExB velocity shear are of the same order of magnitude. The impact of s on ExB velocity shear through the pressure gradient term is stronger than that through the velocity terms. The results indicate that, alike MHD, the magnetic shear and the sheared toroidal and poloidal velocities act synergetically in producing electric fields and therefore ExB velocity shear profiles compatible with ones observed in discharges with ITBs; owing to the pressure gadient term, however, the impact of s on the electic field, its shear and the shear of ExB velocity is stronger than that in MHD.
description: 25 pages, 21 figures
title: Лингвокультурологическое описание русских паремий с компонентами-названиями декоративных птиц (на фоне китайского языка)
Creators: name: Хо, Сяоцзюн
Publisher: name: Новгородский государственный университет имени Ярослава Мудрого (НовГУ)
Year: 2021

description: Рассматриваются актуальные проблемы лингвокультурологического описания паремий с компонентами-зоонимами. Образы птиц и животных нашли отражение в значительном количестве паремий, многие их которых представляют трудности для инофонов. Целью данной работы является исследование лингвокультурологического потенциала русских паремий с компонентами-названиями декоративных птиц на фоне их китайских соответствий. Из поставленной цели вытекают следующие задачи: выявить общие и различающиеся установки культуры, отраженные в русских и китайских паремиях с компонентом-орнитонимом; проанализировать стереотипные представления двух народов о типичных декоративных птицах: павлине / паве, попугае и голубе, выявить их сходства и различия. В ходе исследования установлено, что образы этих трёх птиц амбивалентны в двух культурах, а стереотипные представления двух народов о павлине/паве и голубе имеют больше сходств, чем различий. Выводы данного исследования могут быть использованы в составлении двуязычных фразеологических словарей.
Pseudoscalar heavy quarkonium production in heavy ion ultraperipheral collision
Creators: name: Jiang, Jun
name: Li, Shi-Yuan
name: Liang, Xiao
name: Liu, Yan-Rui
name: Qiao, Cong-Feng
name: Si, Zong-Guo
name: Yang, Hao
Publisher: name: arXiv
Year: 2024
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: The inclusive production of pseudoscalar heavy quarkoniua ($η_c,~η_b$ and $B_c$) via photon-photon fusion in heavy ion ultraperipheral collision (UPC) are calculated to QCD next-to-leading order in the framework of non-relativistic QCD (NRQCD). The total cross section of $η_c$ produced in Pb-Pb UPC is 194 $\mathrm{nb}$ and 1275 $\mathrm{nb}$ at nucleon-nucleon c.m. energies $\sqrt{S_{\mathrm{NN}}}=$ 5.52 TeV and 39.4 TeV, respectively. The cross sections for $η_b$ and $B_c$ mesons are more than two to three orders of magnitude smaller. We make a detailed phenomenological analysis on the $η_c$ production; the uncertainties caused by the renormalization scale and the charm quark mass, the cross sections in other ultraperipheral nucleon-nucleon colliding systems, and the transverse momentum distribution are discussed. At the coming HL-LHC and future FCC, the heavy ion UPC opens another door of the study on the production of heavy quarkonium.
description: 17 pages, 1 figures, 4 tables
Stability of multi-electron bubbles in liquid helium
Creators: name: Guo, Wei
name: Jin, Dafei
name: Maris, Humphrey J.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: The stability of multi-electron bubbles in liquid helium is investigated theoretically. We find that multi-electron bubbles are unstable against fission whenever the pressure is positive. It is shown that for moving bubbles the Bernoulli effect can result in a range of pressures over which the bubbles are stable.
description: 7 pages, 5 figures
MADURO, António Valério; RASQUILHO, Rui, coord. – Um mosteiro entre os rios: o território alcobacense
Creators: name: Costa, Isabel Teixeira
Publisher: name: Lusitania Sacra
Year: 2023

description: Lusitania Sacra, n. 48 (2023): Relações entre o Papado e a Península Ibérica (séculos XI-XIII)
"Is it a Qoincidence?": An Exploratory Study of QAnon on Voat
Creators: name: Papasavva, Antonis
name: Blackburn, Jeremy
name: Stringhini, Gianluca
name: Zannettou, Savvas
name: De Cristofaro, Emiliano
Publisher: name: arXiv
Year: 2020
Subjects: subject: Computers and Society (cs.CY)
subject: FOS: Computer and information sciences

description: Online fringe communities offer fertile grounds for users seeking and sharing ideas fueling suspicion of mainstream news and conspiracy theories. Among these, the QAnon conspiracy theory emerged in 2017 on 4chan, broadly supporting the idea that powerful politicians, aristocrats, and celebrities are closely engaged in a global pedophile ring. Simultaneously, governments are thought to be controlled by "puppet masters," as democratically elected officials serve as a fake showroom of democracy. This paper provides an empirical exploratory analysis of the QAnon community on Voat.co, a Reddit-esque news aggregator, which has captured the interest of the press for its toxicity and for providing a platform to QAnon followers. More precisely, we analyze a large dataset from /v/GreatAwakening, the most popular QAnon-related subverse (the Voat equivalent of a subreddit), to characterize activity and user engagement. To further understand the discourse around QAnon, we study the most popular named entities mentioned in the posts, along with the most prominent topics of discussion, which focus on US politics, Donald Trump, and world events. We also use word embeddings to identify narratives around QAnon-specific keywords. Our graph visualization shows that some of the QAnon-related ones are closely related to those from the Pizzagate conspiracy theory and so-called drops by "Q." Finally, we analyze content toxicity, finding that discussions on /v/GreatAwakening are less toxic than in the broad Voat community.
Contributions of Vacuum and Plasmon Modes to the Force on a Small Sphere near a Plate
Creators: name: Ford, L. H.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The force on a small sphere with a plasma model dielectric function and in the presence of a perfectly reflecting plane is considered. The contribution of both the vacuum modes of the quantized electromagnetic field and of plasmon modes in the sphere are discussed. In the case that the plasmon modes are in their ground state, quasi-oscillatory terms from the vacuum and plasmon parts cancel one another, leading a monotonic attractive force. If the plasmon modes are not in the ground state, the net force is quasi-oscillatory. In both cases, the sphere behaves in the same way as does an atom in either its ground state or an excited state.
description: 7 pages, no figures, talk presented at "Quantum Fields under External Conditions - 2005", Barcelona, Spain, September 2005
Immunoaffinity chromatographic purification of bovine plasma factor XIII using chicken’s egg yolk immunoglobulin (IgY)
Creators: name: Wan, Eddy Nga Tat
Publisher: name: University of British Columbia
Year: 2009

description: Bovine plasma FXIII belongs to the family of enzymes referred to as transglutaminase (EC 2.3.2.13). A novel method for purifying bovine plasma FXIII was developed, which involved the use of bovine plasma FXIII-specific egg yolk immunoglobulin (IgY) in immunoaffinity chromatography. To improve the specificity of crude IgY polyclonal antibodies against the enzyme, the antibody preparation was purified by the adsorption of specific IgY using purified bovine plasma FXIII, with or without an additional step for the removal of bovine serum albumin- (BSA-) crossreactive antibodies using BSA as the antigen. Immunosorbents were prepared using specific IgY thus produced. It was found that a higher degree of purification of bovine plasma FXIII was attained (specific activity and purification factor of up to 316 nmol monodansylcadaverine incorporated/ 30 min/ mg protein and 64.8 -fold respectively) when both purification steps with respect to specific IgY were employed. With further optimization, immunoaffinity chromatographic method using specific IgY such as that described in this study for the purification of bovine plasma FXIII should be a viable and attractive alternative to other methods currently available.
Dimensional Transmutation in Gravity and Cosmology
Creators: name: Salvio, Alberto
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We review (and extend) the analysis of general theories of all interactions (gravity included) where the mass scales are due to dimensional transmutation. Quantum consistency requires the presence of terms in the action with four derivatives of the metric. It is shown, nevertheless, how unitary is achieved and the classical Ostrogradsky instabilities can be avoided. The four-derivative terms also allow us to have a UV complete framework and a naturally small ratio between the Higgs mass and the Planck scale. Moreover, black holes of Einstein gravity with horizons smaller than a certain (microscopic) scale are replaced by horizonless ultracompact objects that are free from any singularity and have interesting phenomenological applications. We also discuss the predictions that can be compared with observations of the microwave background radiation anisotropies and find that this scenario is viable and can be tested with future data. Finally, how strong phase transitions can emerge in models of this type with approximate scale symmetry and how to test them with GW detectors is reviewed and explained.
description: 64 pages, 5 figures, review article (invited by the International Journal of Modern Physics A); v2 is the published version
Elicitation on existentials, lexical items, and causatives
Creators: name: Lekka, Mina
name: Ding, Lydia
name: Drummond, Emily
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2020
Subjects: subject: nkr

description: One .wav audio file for an elicitation on existentials, lexical items, and causatives. Corresponds to pages 171-186 in Notebook 1.
Probing spin dynamics and quantum relaxation in LiY0.998Ho0.002F4 via 19F NMR
Creators: name: Graf, M. J.
name: Lascialfari, A.
name: Borsa, F.
name: Tkachuk, A. M.
name: Barbara, B.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We report measurements of 19F nuclear spin-lattice relaxation 1/T1 as a function of temperature and external magnetic field in LiY0.998Ho0.002F4 single crystal, a single-ion magnet exhibiting interesting quantum effects. The 19F 1/T1 is found to depend on the coupling with the diluted rare-earth (RE) moments. Depending on the temperature range, a fast spin diffusion regime or a diffusion limited regime is encountered. In both cases we find it possible to use the 19F nucleus as a probe of the rare-earth spin dynamics. The results for 1/T1 show a behavior similar to that observed in molecular nanomagnets, a result which we attribute to the discreteness of the energy levels in both cases. At intermediate temperatures the lifetime broadening of the crystal field split RE magnetic levels follows a T3 power law. At low temperature the field dependence of 1/T1 shows peaks in correspondence to the critical magnetic fields for energy level crossings (LC). The results can be explained by inelastic scattering between the fluorine nuclear spins and the RE magnetic levels. A key result of this study is that the broadening of the levels at LC is found to be become extremely small at low temperatures, about 1.7 mT, a value which is comparable to the weak dipolar fields at the RE lattice positions. Thus, unlike the molecular magnets, decoherence effects are strongly suppressed, and it may be possible to measure directly the level repulsions at avoided level crossings.
description: 21 pages, 5 figures
DIFFERENTIATION AND SYNERGIES IN RURAL TOURISM: EVIDENCE FROM ISRAEL
Creators: name: Tchetchik, Anat
name: Fleischer, Aliza
name: Finkelshtain, Israel
name: Tchetchik, Anat
name: Fleischer, Aliza
name: Finkelshtain, Israel
Publisher: name: Unknown
Year: 2006
Subjects: subject: Community/Rural/Urban Development
subject: Rural tourism
subject: Differentiated goods
subject: Oligopoly markup

description: This paper applies a discrete-choice framework with product differentiation to model the rural tourism industry in Israel and to jointly estimate the effect of lodging and farm characteristics on consumer preferences and firms' costs. The model accounts for heterogeneity in tastes and technologies and allows for unobservable product characteristics. We find evidence for technological synergy in joint production of farming and rural hospitality, but none in the demand. The differentiation in the industry is vast and is the major contributor to the price-cost margin, which averages 62%. An additional minor cause are government regulations, which restrict supply. Simulation results demonstrate the growth potential of the industry and show that the government can play an important role in catalyzing growth via investment subsidization, deregulation of supply and information distribution.
Aggiornamento delle funzioni di monitoring online per il nuovo Silicon Vertex Tracker dell'esperimento CDF al Tevatron
Creators: name: Di Ruzza, Benedetto
Publisher: name: INFN Open Access Repository
Year: 2005
Subjects: High Energy Physics
CDFII
Tevatron
SVT
Silicon Vertex Tracker
Real Time monitoring system
Bs meson secondary vertex
Bs meson decays
online monitoring
Fermilab

description: "Aggiornamento delle funzioni di monitoring online per il nuovo Silicon Vertex Tracker dell'esperimento CDF al Tevatron" SPYMON: the Real Time Online Monitorig Package for the SVT trigger system, implemented in the CDFII Detector during the SVT Upgrade Project in 2004-2005. Benedetto Di Ruzza Master's Degree Thesis. Supervisors: Prof.ssa Lucia Sorrentino Zanello and Dott. Marco Rescigno
Abnormal Frequency Response Determined by Saddle Points in Non-Hermitian Crystal Systems
Creators: name: Zhou, Kunling
name: Zhao, Jun
name: Zeng, Bowen
name: Hu, Yong
Publisher: name: arXiv
Year: 2024
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: In non-Hermitian crystal systems under open boundary condition (OBC), it is generally believed that the OBC modes with frequencies containing positive imaginary parts, when excited by external driving, will experience exponential growth in population, thereby leading to instability. However, our work challenges this conventional understanding. In such a system, we find an anomalous response that grows exponentially with the frequency aligned with those of saddle points. The frequencies of these saddle points on the complex plane are below the maximum imaginary part of OBC spectrum, but they can lie within or beyond the OBC spectrum. We derive general formulas of excitation-response relationships and find that this anomalous response can occur because the excitation of OBC modes eventually evolve toward these saddle points at long times. Only when the frequencies of all these saddle points are below the real axis do the non-Hermitian crystal systems remain stable under periodic excitation. Thus our results also provide new insights on the stability criterion of non-Hermitian crystal systems.
description: 5 pages, 4 figures
Connections functorially attached to almost complex product structures
Creators: name: Etayo, Fernando
name: Santamaría, Rafael
Publisher: name: arXiv
Year: 2005
Subjects: subject: Differential Geometry (math.DG)
subject: FOS: Mathematics
subject: 53A55, 53A60, 53B05, 53C10

description: Manifolds endowed with three foliations pairwise transversal are known as 3-webs. Equivalently, they can be algebraically defined as biparacomplex or complex product manifolds, i.e., manifolds endowed with three tensor fields of type $(1,1)$, $F$, $P$ and $J=F \circ P$, where the two first are product and the third one is complex, and they mutually anti-commute. In this case, it is well known that there exists a unique torsion-free connection parallelizing the structure. In the present paper, we study connections attached to non-integrable almost biparacomplex manifolds.
description: sections 3 and 4 rewritten and simplified, added subsection 4.1 and updated references
Dynamics of capillary coalescence and breakup: quasi-two-dimensional nematic and isotropic droplets
Creators: name: Dolganov, P. V.
name: Zverev, A. S.
name: Baklanova, K. D.
name: Dolganov, V. K.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: For the first time we observed formation of small satellite droplets from the bridge at droplet coalescence. Investigations were made using a Hele-Shaw cell in the two-phase region at nematic-isotropic phase transition. In previous works on coalescence it was considered that before start of coalescence there exists a bridge between the outer fluid connecting regions on the two sides of the droplets (outer bridge). After start of coalescence a bridge connecting the two droplets appears (droplet bridge) and the outer bridge is broken. For the first time we have shown that there are coalescence processes when after start of coalescence both the droplet bridge and the outer bridge can exist. This cardinally changes the coalescence process. During the first coalescence stage the size of the outer bridge decreases, the size of the droplet bridge increases. During the second stage the outer bridge becomes unstable with pinch-off, formation of pointed end domains, secondary instability, splitting of pointed end domains and formation of satellite droplets. Our work connects two areas of fluid dynamics: coalescence and breakup with formation of satellite droplets.
description: 8 pages, 8 figures