cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Standard Self-Confinement and Extrinsic Turbulence Models for Cosmic Ray Transport are Fundamentally Incompatible with Observations
Creators: name: Hopkins, Philip F.
name: Squire, Jonathan
name: Butsky, Iryna S.
name: Ji, Suoqing
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Plasma Physics (physics.plasm-ph)
subject: Space Physics (physics.space-ph)
subject: FOS: Physical sciences

description: Models for cosmic ray (CR) dynamics fundamentally depend on the rate of CR scattering from magnetic fluctuations. In the ISM, for CRs with energies ~MeV-TeV, these fluctuations are usually attributed either to 'extrinsic turbulence' (ET) - a cascade from larger scales - or 'self-confinement' (SC) - self-generated fluctuations from CR streaming. Using simple analytic arguments and detailed live numerical CR transport calculations in galaxy simulations, we show that both of these, in standard form, cannot explain even basic qualitative features of observed CR spectra. For ET, any spectrum that obeys critical balance or features realistic anisotropy, or any spectrum that accounts for finite damping below the dissipation scale, predicts qualitatively incorrect spectral shapes and scalings of B/C and other species. Even if somehow one ignored both anisotropy and damping, observationally-required scattering rates disagree with ET predictions by orders-of-magnitude. For SC, the dependence of driving on CR energy density means that it is nearly impossible to recover observed CR spectral shapes and scalings, and again there is an orders-of-magnitude normalization problem. But more severely, SC solutions with super-Alfvenic streaming are unstable. In live simulations, they revert to either arbitrarily-rapid CR escape with zero secondary production, or to bottleneck solutions with far-too-strong CR confinement and secondary production. Resolving these fundamental issues without discarding basic plasma processes requires invoking different drivers for scattering fluctuations. These must act on a broad range of scales with a power spectrum obeying several specific (but plausible) constraints.
description: 36 pages, 7 figures. Updated to match published version, added section discussing 'meso-scale' phenomenology
Inhibition by Agrobacterium tumefaciens and Pseudomonas savastanoi of development of the hypersensitive response elicited by Pseudomonas syringae pv. phaseolicola.
Creators: name: Matthysse, A G
name: Robinette, D
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 1990

description: Injection into tobacco leaves of biotype 1 Agrobacterium tumefaciens or of Pseudomonas savastanoi inhibited the development of a visible hypersensitive response to the subsequent injection at the same site of Pseudomonas syringae pv. phaseolicola. This interference with the hypersensitive response was not seen with injection of bacterial growth medium or Escherichia coli cells. Live A. tumefaciens cells were required for the inhibitory effect. Various mutants and strains of A. tumefaciens were examined to determine the genes involved. Known chromosomal mutations generally had no effect on the ability of A. tumefaciens to inhibit the hypersensitive response, except for chvB mutants which showed a reduced (but still significant) inhibition of the hypersensitive response. Ti plasmid genes appeared to be required for the inhibition of the hypersensitive response. The bacteria did not need to be virulent in order to inhibit the hypersensitive response. Deletion of the vir region from pTi had no effect on the inhibition. However, the T region of the Ti plasmid was required for inhibition. Studies of transposon mutants suggested that the tms but not tmr or ocs genes were required. These genes were not acting after transfer to plant cells since they were effective in strains lacking vir genes and thus unable to transfer DNA to plant cells. The results suggest that the expression of the tms genes in the bacteria may inhibit the development of the hypersensitive response by the plant. An examination of the genes required in P. savastanoi for the inhibition of the hypersensitive response suggested that bacterial production of auxin was also required for the inhibition of the hypersensitive response by these bacteria.
Black Holes in Klein Space
Creators: name: Crawley, Erin
name: Guevara, Alfredo
name: Miller, Noah
name: Strominger, Andrew
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The analytic continuation of the general signature $(1,3)$ Lorentzian Kerr-Taub-NUT black holes to signature $(2,2)$ Kleinian black holes is studied. Their global structure is characterized by a toric Penrose diagram resembling their Lorentzian counterparts. Kleinian black holes are found to be self-dual when their mass and NUT charge are equal for any value of the Kerr rotation parameter $a$. Remarkably, it is shown that the rotation $a$ can be eliminated by a large diffeomorphism; this result also holds in Euclidean signature. The continuation from Lorentzian to Kleinian signature is naturally induced by the analytic continuation of the S-matrix. Indeed, we show that the geometry of linearized black holes, including Kerr-Taub-NUT, is captured by $(2,2)$ three-point scattering amplitudes of a graviton and a massive spinning particle. This stands in sharp contrast to their Lorentzian counterparts for which the latter vanishes kinematically, and enables a direct link to the S-matrix.
description: 23 pages, 5 appendices, 5 figures
Demonstration of a fully tuneable entangling gate for continuous-variable one-way quantum computation
Creators: name: Yokoyama, Shota
name: Ukai, Ryuji
name: Armstrong, Seiji C.
name: Yoshikawa, Jun-ichi
name: van Loock, Peter
name: Furusawa, Akira
Publisher: name: arXiv
Year: 2014
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We introduce a fully tuneable entangling gate for continuous-variable one-way quantum computation. We present a proof-of-principle demonstration by propagating two independent optical inputs through a three-mode linear cluster state and applying the gate in various regimes. The genuine quantum nature of the gate is confirmed by verifying the entanglement strength in the output state. Our protocol can be readily incorporated into efficient multi-mode interaction operations in the context of large-scale one-way quantum computation, as our tuning process is the generalisation of cluster state shaping.
description: 8 pages, 5 figures
Captured by Zygmunt
Creators: name: Wolff, J
name: Sfard, A
name: Supski, Sian
Publisher: name: La Trobe
Year: 2023
Subjects: classificationCode: 360604
subject: Photography, video and lens-based practice

description: “Konrad is her name for Zygmunt in her second memoir. Many years after these walks, a week after Zygmunt’s death, a small group of family and friends gathered for lunch one last time at Lawnswood Gardens, and Zygmunt’s and Janina’s daughters invited me to choose one of his photos. So I have on my desk now this beautiful little photo of a Yorkshire mill.”
Modular-proximal gradient algorithms in variable exponent Lebesgue spaces
Creators: name: Lazzaretti, Marta
name: Calatroni, Luca
name: Estatico, Claudio
Publisher: name: arXiv
Year: 2021
Subjects: subject: Optimization and Control (math.OC)
subject: Numerical Analysis (math.NA)
subject: FOS: Mathematics

description: We consider structured optimisation problems defined in terms of the sum of a smooth and convex function, and a proper, l.s.c., convex (typically non-smooth) one in reflexive variable exponent Lebesgue spaces $L_{p(\cdot)}(Ω)$. Due to their intrinsic space-variant properties, such spaces can be naturally used as solution space and combined with space-variant functionals for the solution of ill-posed inverse problems. For this purpose, we propose and analyse two instances (primal and dual) of proximal gradient algorithms in $L_{p(\cdot)}(Ω)$, where the proximal step, rather than depending on the natural (non-separable) $L_{p(\cdot)}(Ω)$ norm, is defined in terms of its modular function, which, thanks to its separability, allows for the efficient computation of algorithmic iterates. Convergence in function values is proved for both algorithms, with convergence rates depending on problem/space smoothness. To show the effectiveness of the proposed modelling, some numerical tests highlighting the flexibility of the space $L_{p(\cdot)}(Ω)$ are shown for exemplar deconvolution and mixed noise removal problems. Finally, a numerical verification on the convergence speed and computational costs of both algorithms in comparison with analogous ones defined in standard $L_{p}(Ω)$ spaces is presented.
Layered, Exact-Repair Regenerating Codes Via Embedded Error Correction and Block Designs
Creators: name: Tian, Chao
name: Sasidharan, Birenjith
name: Aggarwal, Vaneet
name: Vaishampayan, Vinay A.
name: Kumar, P. Vijay
Publisher: name: arXiv
Year: 2014
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: A new class of exact-repair regenerating codes is constructed by stitching together shorter erasure correction codes, where the stitching pattern can be viewed as block designs. The proposed codes have the "help-by-transfer" property where the helper nodes simply transfer part of the stored data directly, without performing any computation. This embedded error correction structure makes the decoding process straightforward, and in some cases the complexity is very low. We show that this construction is able to achieve performance better than space-sharing between the minimum storage regenerating codes and the minimum repair-bandwidth regenerating codes, and it is the first class of codes to achieve this performance. In fact, it is shown that the proposed construction can achieve a non-trivial point on the optimal functional-repair tradeoff, and it is asymptotically optimal at high rate, i.e., it asymptotically approaches the minimum storage and the minimum repair-bandwidth simultaneously.
description: This is a combination of the following two papers with additional results (new asymptotic analysis, a better alphabet size bound and smaller repetition factors): arXiv:1302.4670 "Exact-Repair Regenerating Codes Via Layered Erasure Correction and Block Designs" by Tian, Aggarwal, and Vaishampayan, and arXiv:1301.6157 "High-Rate Regenerating Codes Through Layering" by Sasidharan and Kumar
Marvin: an Innovative Omni-Directional Robotic Assistant for Domestic Environments
Creators: name: Eirale, Andrea
name: Martini, Mauro
name: Tagliavini, Luigi
name: Gandini, Dario
name: Chiaberge, Marcello
name: Quaglia, Giuseppe
Publisher: name: arXiv
Year: 2021
Subjects: subject: Robotics (cs.RO)
subject: Artificial Intelligence (cs.AI)
subject: Systems and Control (eess.SY)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Population ageing and pandemics recently demonstrate to cause isolation of elderly people in their houses, generating the need for a reliable assistive figure. Robotic assistants are the new frontier of innovation for domestic welfare, and elderly monitoring is one of the services a robot can handle for collective well-being. Despite these emerging needs, in the actual landscape of robotic assistants there are no platform which successfully combines a reliable mobility in cluttered domestic spaces, with lightweight and offline Artificial Intelligence (AI) solutions for perception and interaction. In this work, we present Marvin, a novel assistive robotic platform we developed with a modular layer-based architecture, merging a flexible mechanical design with cutting-edge AI for perception and vocal control. We focus the design of Marvin on three target service functions: monitoring of elderly and reduced-mobility subjects, remote presence and connectivity, and night assistance. Compared to previous works, we propose a tiny omnidirectional platform, which enables agile mobility and effective obstacle avoidance. Moreover, we design a controllable positioning device, which easily allows the user to access the interface for connectivity and extends the visual range of the camera sensor. Nonetheless, we delicately consider the privacy issues arising from private data collection on cloud services, a critical aspect of commercial AI-based assistants. To this end, we demonstrate how lightweight deep learning solutions for visual perception and vocal command can be adopted, completely running offline on the embedded hardware of the robot.
description: 20 pages, 9 figures, 3 table
Multi-objective optimization of energy consumption and execution time in a single level cache memory for embedded systems
Creators: name: Álvarez, Josefa Díaz
name: Risco-Martín, José L.
name: Colmenar, J. Manuel
Publisher: name: arXiv
Year: 2023
Subjects: subject: Neural and Evolutionary Computing (cs.NE)
subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences

description: Current embedded systems are specifically designed to run multimedia applications. These applications have a big impact on both performance and energy consumption. Both metrics can be optimized selecting the best cache configuration for a target set of applications. Multi-objective optimization may help to minimize both conflicting metrics in an independent manner. In this work, we propose an optimization method that based on Multi-Objective Evolutionary Algorithms, is able to find the best cache configuration for a given set of applications. To evaluate the goodness of candidate solutions, the execution of the optimization algorithm is combined with a static profiling methodology using several well-known simulation tools. Results show that our optimization framework is able to obtain an optimized cache for Mediabench applications. Compared to a baseline cache memory, our design method reaches an average improvement of 64.43\% and 91.69\% in execution time and energy consumption, respectively.
Сфираль и структура мышления: топология различий и актов осознания
Creators: name: Басаргин, Олег Сергеевич
Publisher: name: Zenodo
Year: 2025

description: Мышление традиционно описывается через логические операции, линейные рассуждения, дедуктивные или индуктивные структуры. Однако такое представление игнорирует фазовость, цикличность, множественность состояний и переходов, характерных для реального акта мышления. В этой статье мы предлагаем концептуализировать мышление как процесс, структурированный по принципу Сфирали — фигуры, объединяющей направленность, антисимметрию, фрактальность и вложенность.

Мы продолжаем предыдущие исследования, в которых Сфираль была рассмотрена как модель времени и сознания, и переносим её принципы в пространство ментальных операций.
On tidal capture of primordial black holes by neutron stars
Creators: name: Defillon, Guillaume
name: Granet, Etienne
name: Tinyakov, Petr
name: Tytgat, Michel H. G.
Publisher: name: arXiv
Year: 2014
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: The fraction of primordial black holes (PBHs) of masses $10^{17} - 10^{26}$ g in the total amount of dark matter may be constrained by considering their capture by neutron stars (NSs), which leads to the rapid destruction of the latter. The constraints depend crucially on the capture rate which, in turn, is determined by the energy loss by a PBH passing through a NS. Two alternative approaches to estimate the energy loss have been used in the literature: the one based on the dynamical friction mechanism, and another on tidal deformations of the NS by the PBH. The second mechanism was claimed to be more efficient by several orders of magnitude due to the excitation of particular oscillation modes reminiscent of the surface waves. We address this disagreement by considering a simple analytically solvable model that consists of a flat incompressible fluid in an external gravitational field. In this model, we calculate the energy loss by a PBH traversing the fluid surface. We find that the excitation of modes with the propagation velocity smaller than that of PBH is suppressed, which implies that in a realistic situation of a supersonic PBH the large contributions from the surface waves are absent and the above two approaches lead to consistent expressions for the energy loss.
description: 7 pages
Purified Escherichia coli F-factor TraY protein binds oriT.
Creators: name: Matson, S W
name: Lahue, E E
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 1990

description: The traY gene of the Escherichia coli F plasmid has been shown by genetic studies (R. Everett and N. Willetts, J. Mol. Biol. 136:129-150, 1980) to be involved in the site-specific nicking reaction at oriT required for the initiation of DNA transfer during bacterial conjugation. In order to assign a biochemical function to TraY protein, the traY gene was cloned in a plasmid vector which utilizes the strong T7 phi 10 promoter to overproduce the protein. The plasmid-encoded TraY protein was specifically labeled with [35S]methionine, and purification of the polypeptide was accomplished by monitoring the radioactive label. Purified TraY protein had a relative molecular mass of approximately 17,000, as determined by polyacrylamide gel electrophoresis in the presence of sodium dodecyl sulfate. The amino terminus of the purified protein was sequenced to confirm that the protein was encoded by the traY gene. The protein sequence revealed that the start codon for the TraY protein was a UUG codon 36 base pairs upstream of the AUG start site originally deduced from the DNA sequence (T. Fowler, L. Taylor, and R. Thompson, Gene 26:79-89, 1983). This start sequence confirmed the premise of Inamoto et al. that the F-plasmid TraY polypeptide-coding sequence would begin with UUG, creating a reading frame which renders a large degree of amino acid sequence identity with the TraY polypeptide from R100 (S. Inamoto, Y. Yoshioka, and E. Ohtsubo, J. Bacteriol. 170:2749-2757, 1988). The purified TraY protein from F bound specifically to the origin of transfer region of the F plasmid. However, no nicking activity was detected at oriT by using TraY protein or TraY protein in conjunction with helicase I.
Causal Graphs: Addressing the Confounding Problem Without Instruments or Ignorability
Creators: name: Shpitser, Ilya
Publisher: name: arXiv
Year: 2014
Subjects: subject: Methodology (stat.ME)
subject: FOS: Computer and information sciences

description: Discussion of "Instrumental Variables: An Econometrician's Perspective" by Guido W. Imbens [arXiv:1410.0163].
description: Published in at http://dx.doi.org/10.1214/14-STS488 the Statistical Science (http://www.imstat.org/sts/) by the Institute of Mathematical Statistics (http://www.imstat.org)
A Unified Cloud-Enabled Discrete Event Parallel and Distributed Simulation Architecture
Creators: name: Risco-Martín, José L.
name: Henares, Kevin
name: Mittal, Saurabh
name: Almendras, Luis F.
name: Olcoz, Katzalin
Publisher: name: arXiv
Year: 2023
Subjects: subject: Distributed, Parallel, and Cluster Computing (cs.DC)
subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences

description: Cloud simulation environments today are largely employed to model and simulate complex systems for remote accessibility and variable capacity requirements. In this regard, scalability issues in Modeling and Simulation (M\&S) computational requirements can be tackled through the elasticity of on-demand Cloud deployment. However, implementing a high performance cloud M\&S framework following these elastic principles is not a trivial task as parallelizing and distributing existing architectures is challenging. Indeed, both the parallel and distributed M\&S developments have evolved following separate ways. Parallel solutions has always been focused on ad-hoc solutions, while distributed approaches, on the other hand, have led to the definition of standard distributed frameworks like the High Level Architecture (HLA) or influenced the use of distributed technologies like the Message Passing Interface (MPI). Only a few developments have been able to evolve with the current resilience of computing hardware resources deployment, largely focused on the implementation of Simulation as a Service (SaaS), albeit independently of the parallel ad-hoc methods branch. In this paper, we present a unified parallel and distributed M\&S architecture with enough flexibility to deploy parallel and distributed simulations in the Cloud with a low effort, without modifying the underlying model source code, and reaching important speedups against the sequential simulation, especially in the parallel implementation. Our framework is based on the Discrete Event System Specification (DEVS) formalism. The performance of the parallel and distributed framework is tested using the xDEVS M\&S tool, Application Programming Interface (API) and the DEVStone benchmark with up to eight computing nodes, obtaining maximum speedups of $15.95\times$ and $1.84\times$, respectively.
Anisotropic long-range spin transport in canted antiferromagnetic orthoferrite YFeO$_3$
Creators: name: Das, Shubhankar
name: Ross, A.
name: Ma, X. X.
name: Becker, S.
name: Schmitt, C.
name: van Duijn, F.
name: Fuhrmann, F.
name: Syskaki, M. -A.
name: Ebels, U.
name: Baltz, V.
name: Barra, A. -L.
name: Chen, H. Y.
name: Jakob, G.
name: Cao, S. X.
name: Sinova, J.
name: Gomonay, O.
name: Lebrun, R.
name: Kläui, M.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: In antiferromagnets, the efficient propagation of spin-waves has until now only been observed in the insulating antiferromagnet hematite, where circularly (or a superposition of pairs of linearly) polarized spin-waves propagate over long distances. Here, we report long-distance spin-transport in the antiferromagnetic orthoferrite YFeO$_3$, where a different transport mechanism is enabled by the combined presence of the Dzyaloshinskii-Moriya interaction and externally applied fields. The magnon decay length is shown to exceed hundreds of nano-meters, in line with resonance measurements that highlight the low magnetic damping. We observe a strong anisotropy in the magnon decay lengths that we can attribute to the role of the magnon group velocity in the propagation of spin-waves in antiferromagnets. This unique mode of transport identified in YFeO$_3$ opens up the possibility of a large and technologically relevant class of materials, i.e., canted antiferromagnets, for long-distance spin transport.
description: Manuscript - 24 pages and 4 figures, Supplementary - 22 pages and 10 figures
SecB-independent export of Escherichia coli ribose-binding protein (RBP): some comparisons with export of maltose-binding protein (MBP) and studies with RBP-MBP hybrid proteins.
Creators: name: Bassford, P J
name: Collier, D N
name: Strobel, S M
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 1990

description: The efficient export of the Escherichia coli maltose-binding protein (MBP) is known to be SecB dependent, whereas ribose-binding protein (RBP) export is SecB independent. When the MBP and RBP signal peptides were exchanged precisely at the signal peptidase processing sites, the resultant RBP-MBP and MBP-RBP hybrid proteins both were efficiently exported in SecB+ cells. However, only MBP-RBP was efficiently exported in SecB- cells; RBP-MBP exhibited a significant export defect, a finding that was consistent with previous proposals that SecB specifically interacts with the mature moiety of precursor MBP to promote export. The relatively slow, totally posttranslational export mode exhibited by certain mutant RBP and MBP-RBP species in SecB+ cells was not affected by the loss of SecB. In contrast, MBP and RBP-MBP species with similarly altered signal peptides were totally export defective in SecB- cells. Both export-defective MBP and RBP-MBP interfered with SecB-mediated protein export by depleting cells of functional SecB. In contrast, neither export-defective RBP nor MBP-RBP elicited such an interference effect. These and other data indicated that SecB is unable to interact with precursor RBP or that any interaction between these two proteins is considerably weaker than that of SecB with precursor MBP. In addition, no correlation could be established between a SecB requirement for export and PrlA-mediated suppression of signal peptide export defects. Finally, previous studies have established that wild-type MBP export can be accomplished cotranslationally, whereas wild-type RBP export is strictly a posttranslational process. In this study, cotranslational export was not detected for either MBP-RBP or RBP-MBP. This indicates that the export mode exhibited by a given precursor protein (cotranslational versus posttranslational) is determined by properties of both the signal peptide and the mature moiety.
From electrons to baby skyrmions in Chern ferromagnets: A topological mechanism for spin-polaron formation in twisted bilayer graphene
Creators: name: Khalaf, Eslam
name: Vishwanath, Ashvin
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: The advent of Moiré materials has galvanized interest in the nature of charge carriers in topological bands. In contrast to conventional materials where charge carriers are electron-like quasiparticles, topological bands allow for more exotic possibilities where charge is carried by nontrivial topological textures, such as skyrmions. However, the real space description of skyrmions is ill-suited to address the limit of small or `baby' skyrmions which consist of an electron and a few spin flips. Here, we study the formation of the smallest skyrmions -- spin polarons, formed as bound states of an electron and a spin flip -- in Chern ferromagnets. We show that, quite generally, there is an attraction between an electron and a spin flip that is purely topological in origin and of $p$-wave symmetry, which promotes the formation of spin polarons. Applying our results to the topological bands of twisted bilayer graphene, we identify a range of parameters where spin polarons are formed and are lower in energy than electrons. In particular, spin polarons are found to be energetically cheaper on doping correlated insulators at integer fillings towards charge neutrality, consistent with the absence of quantum oscillations and the rapid onset of flavor polarization (cascade) transition in this regime. Our study sets the stage for pairing of spin polarons, helping bridge skyrmion pairing scenarios and momentum space approaches to superconductivity.
description: 7 pages
Bending strain-tunable magnetic anisotropy in Co2FeAl Heusler thin film on Kapton
Creators: name: Gueye, M.
name: Wague, B. M.
name: Zighem, F.
name: Belmeguenai, M.
name: Gabor, M. S.
name: Petrisor, T.
name: Tiusan, C.
name: Mercon, S.
name: Faurie, D.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Bending effect on the magnetic anisotropy in 20 nm Co$_{2}$FeAl Heusler thin film grown on Kapton\textregistered{} has been studied by ferromagnetic resonance and glued on curved sample carrier with various radii. The results reported in this letter show that the magnetic anisotropy is drastically changed in this system by bending the thin films. This effect is attributed to the interfacial strain transmission from the substrate to the film and to the magnetoelastic behavior of the Co$_{2}$FeAl film. Moreover two approaches to determine the in-plane magnetostriction coefficient of the film, leading to a value that is close to $λ^{CFA}=14\times10^{-6}$, have been proposed.
description: 4 pages, 4 figures
Обществу российско-китайской дружбы - 60 лет
Creators: name: Куликова Галина Вениаминовна
Publisher: name: Китай в мировой и региональной политике. История и современность
Year: 2017
Subjects: КИТАЙ
ОБЩЕСТВО РОССИЙСКО-КИТАЙСКОЙ ДРУЖБЫ
РОССИЙСКО-КИТАЙСКИЕ ОТНОШЕНИЯ
НАРОДНАЯ ДИПЛОМАТИЯ
ОРКД

description: 29 октября 2017 г. исполняется 60 лет Обществу российско-китайской дружбы достойному преемнику и продолжателю лучших традиций Общества советско-китайской дружбы первого Общества дружбы с народами зарубежных стран, созданного в Москве 29 октября 1957 г. Общество советско-китайской, ныне российско-китайской дружбы в течение 60-летней истории ни на один день не прекращало своей деятельности. Став первой организацией народной дипломатии в российско-китайских отношениях, ОРКД всегда играло важную роль в привлечении широких слоев общественности нашей страны к развитию взаимопонимания, дружбы, сотрудничества, а ныне и отношений всеобъемлющего партнерства и стратегического взаимодействия между нашими странами и народами.
The folding properties of the Escherichia coli maltose-binding protein influence its interaction with SecB in vitro.
Creators: name: Weiss, J B
name: Bassford, P J
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 1990

description: It has been proposed that the cytoplasmic SecB protein functions as a component of the Escherichia coli protein export machinery by serving as an antifolding factor that retards folding of the precursor maltose-binding protein (preMBP) into a translocation-incompetent form. In this study, it was found that SecB directly interacts with wild-type preMBP and various mutationally altered MBP species synthesized in vitro to form a SecB-MBP complex that can be precipitated with anti-SecB serum. The association of SecB with wild-type preMBP was relatively unstable; such a complex was formed only when SecB was present cotranslationally or after denaturation of previously synthesized preMBP and was detected with only low efficiency. In marked contrast, MBP species that were defective in the ability to assume the stable conformation of wild-type preMBP or that exhibited significantly slower folding kinetics formed much more stable complexes with SecB. In one case, we demonstrated that SecB did not need to be present cotranslationally for complex formation to occur. Formation of a complex between SecB and MBP was clearly not dependent on the MBP signal peptide. However, we were unable to detect complex formation between SecB and MBP lacking virtually the entire signal peptide but having a completely intact mature moiety. This MBP species folded at a rate considerably faster than that of wild-type preMBP. The propensity of this mutant protein to assume the native conformation of mature MBP apparently precludes a stable association with SecB, whereas an MBP species lacking a signal peptide but exhibiting altered folding properties did form a complex with SecB that could be precipitated with anti-SecB serum.
«Один пояс, один путь»: Российская проекция и проблемы сопряжения
Creators: name: Лузянин Сергей Геннадьевич
Publisher: name: Китай в мировой и региональной политике. История и современность
Year: 2017
Subjects: ПРОЕКТ «ОДИН ПОЯС
ОДИН ПУТЬ»
ЭКОНОМИЧЕСКИЙ ПОЯС ШЕЛКОВОГО ПУТИ (ЭПШП)
РОССИЯ
КИТАЙ
СОПРЯЖЕНИЕ
ЕВРАЗИЙСКИЙ ЭКОНОМИЧЕСКИЙ СОЮЗ (ЕАЭС)
АЗИАТСКИЙ БАНК ИНФРАСТРУКТУРНЫХ ИНВЕСТИЦИЙ (АБИИ)

description: В статье анализируются основные положения китайской концепции/проекта «Один пояс, один путь», содержание и смысл современного политологического дискурса по соответствующей проблематике, а также рассматриваются возможные направления реализации названного мегапроекта. Особое внимание уделено российскому вектору китайской инициативы в плане выявления путей сопряжения российских планов экономического развития с китайскими начинаниями, а также расширения кооперации по вопросам сопряжения в коллективном формате (с участием новых интеграционных структур на евразийском пространстве, таких, как Экономический пояс Шелкового пути (ЭПШП), Евразийский экономический союз (ЕАЭС), Азиатский банк инфраструктурных инвестиций (АБИИ) и др.).
Anomalous ideal tensile strength of ferromagnetic Fe and Fe-rich alloys
Creators: name: Li, Xiaoqing
name: Schönecker, Stephan
name: Zhao, Jijun
name: Johansson, Börje
name: Vitos, Levente
Publisher: name: arXiv
Year: 2014
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: Within the same failure mode, iron has the lowest ideal tensile strength among the transition metals crystallizing in the body-centered cubic structure. Here, we demonstrate that this anomalously low strength of Fe originates partly from magnetism and is reflected in unexpected alloying effects in dilute Fe(\emph{M}) (\emph{M} = Al, V, Cr, Mn, Co, Ni) binaries. We employ the structural energy difference and the magnetic pressure to disentangle the magnetic effect on the ideal tensile strength from the chemical effect. We find that the investigated solutes strongly alter the magnetic response of the Fe host from the weak towards a stronger ferromagnetic behavior, which is explained based on single-particle band energies.
description: 5 pages, 4 figures
Peculiar Hydrogen-deficient Carbon Stars: Strontium-Rich Stars and the s-Process
Creators: name: Crawford, Courtney L.
name: Tisserand, Patrick
name: Clayton, Geoffrey C.
name: Munson, Bradley
Publisher: name: arXiv
Year: 2021
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Context: R Coronae Borealis (RCB) variables and their non-variable counterparts, the dustless Hydrogen-Deficient Carbon (dLHdC) stars have been known to exhibit enhanced s-processed material on their surfaces, especially Sr, Y, and Ba. No comprehensive work has been done to explore the s-process in these types of stars, however one particular RCB star, U Aqr, has been under scrutiny for its extraordinary Sr enhancement. Aims: We aim to identify RCB and dLHdC stars that have significantly enhanced Sr abundances, such as U Aqr, and use stellar evolution models to begin to estimate the type of neutron exposure that occurs in a typical HdC star. Methods: We compare the strength of the Sr II 4077 $Å$ spectral line to Ca II H to identify the new subclass of Sr-rich HdCs. We additionally use the structural and abundance information from existing RCB MESA models to calculate the neutron exposure parameter, $τ$ Results: We identify six stars in the Sr-rich class. Two are RCBs, and four are dLHdCs. We additionally find that the preferred RCB MESA model has a neutron exposure $τ$ ~ 0.1 mb$^{-1}$, which is lower than the estimated $τ$ between 0.15 and 0.6 mb$^{-1}$ for the Sr-rich star U Aqr found in the literature. We find trends in the neutron exposure corresponding to He-burning shell temperature, metallicity, and assumed s-processing site. Conclusions: We have found a sub-class of 6 HdCs known as the Sr-rich class, which tend to lie in the halo, outside the typical distribution of RCBs and dLHdCs. We find that dLHdC stars are more likely to be Sr-rich than RCBs, with an occurrence rate of ~13\% for dLHdCs and ~2\% for RCBs. This is one of the first potential spectroscopic differences between RCBs and dLHdCs, along with dLHdCs having stronger surface abundances of $^{18}$O.
description: 8 pages, submitted to A&A
A semiquantitative bioassay for relative virulence of Agrobacterium tumefaciens strains on Bryophyllum daigremontiana.
Creators: name: Minnemeyer, S L
name: Matthysse, A G
name: Lightfoot, R
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 1991

description: An assay to determine the relative virulence of wild-type and mutant strains of Agrobacterium tumefaciens on leaves of Bryophyllum daigremontiana has been developed. This assay is reproducible, is easy to learn, is not time consuming, and requires little space. The relative virulence of cellulose-minus mutants of A. tumefaciens was investigated with this assay. Some of these mutants were unaltered in virulence, while others showed a marked reduction in virulence.
The dawn of a new era for dustless HdC stars with GAIA eDR3
Creators: name: Tisserand, P.
name: Crawford, C. L.
name: Clayton, G. C.
name: Ruiter, A. J.
name: Karambelkar, V.
name: Bessell, M. S.
name: Seitenzahl, I. R.
name: Kasliwal, M. M.
name: Soon, J.
name: Travouillon, T.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Decades after their discovery, only four hydrogen-deficient carbon (HdC) stars were known to have no circumstellar dust shell. This is in complete contrast to the $\sim$130 known Galactic HdC stars that are notorious for being heavy dust producers, i.e. the R Coronae Borealis (RCB) stars. Together they form a rare class of supergiant stars that are thought to originate from the merger of CO/He white dwarf binary systems, otherwise known as the double-degenerate scenario. We searched for new dustless HdC (dLHdC) stars. We used primarily the 2MASS and GAIA eDR3 catalogues to select candidates that were followed-up spectroscopically. We discovered 27 new dLHdC stars, one new RCB star and two new EHe stars. Surprisingly, 20 of the new dLHdC stars share a characteristic of the known dLHdC star HD 148839, having lower atmospheric hydrogen deficiencies. The uncovered population of dLHdC stars exhibit a Bulge-like distribution, like the RCB stars, but show multiple differences from those that indicate they are a different population of HdC stars following its own evolutionary sequence with a fainter luminosity and also a narrow range of effective temperature. We found indication of a current low dust production activity for four of the new dLHdC stars which could be typical RCB stars passing through a transition time. We have evidence for the first time of a large range of absolute magnitudes in the overall population of HdC stars, spanning over 3 mag. In the favoured formation framework, this is explained by a large range in the initial total WD binary mass which leads to a series of evolutionary sequences with distinct maximum brightness and initial temperature. The cold Galactic RCB stars are also noticeably fainter than the Magellanic ones, possibly due to a difference in metallicity resulting in different WD mass ratio. In our Galaxy, there could be as many dLHdC stars as RCB stars.
description: 22 pages, 18 figures, accepted in A&A. V3: minor corrections on Table 2 and 3 related to HD stars names and (V-I)0 colours (Fig.10 changed accordingly). V4: changed the colour to light blue for the two new EHe stars indicated in Fig.10, page 13
Characterization of three Agrobacterium tumefaciens avirulent mutants with chromosomal mutations that affect induction of vir genes.
Creators: name: Metts, J
name: Matthysse, A G
name: Doares, S H
name: West, J
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 1991

description: Three Agrobacterium tumefaciens mutants with chromosomal mutations that affect bacterial virulence were isolated by transposon mutagenesis. Two of the mutants were avirulent on all hosts tested. The third mutant, Ivr-211, was a host range mutant which was avirulent on Bryophyllum diagremontiana, Nicotiana tabacum, N. debneyi, N. glauca, and Daucus carota but was virulent on Zinnia elegans and Lycopersicon esculentum (tomato). That the mutant phenotype was due to the transposon insertion was determined by cloning the DNA containing the transposon insertion and using the cloned DNA to replace the wild-type DNA in the parent bacterial strain by marker exchange. The transposon insertions in the three mutants mapped at three widely separated locations on the bacterial chromosome. The effects of the mutations on various steps in tumor formation were examined. All three mutants showed no alteration in binding to carrot cells. However, none of the mutants showed any induction of vir genes by acetosyringone under conditions in which the parent strain showed vir gene induction. When the mutant bacteria were examined for changes in surface components, it was found that all three of the mutants showed a similar alteration in lipopolysaccharide (LPS). LPS from the mutants was larger in size and more heavily saccharide substituted than LPS from the parent strain. Two of the mutants showed no detectable alteration in outer membrane and periplasmic space proteins. The third mutant, Ivr-225, was missing a 79-kDa surface peptide. The reason(s) for the failure of vir gene induction in these mutants and its relationship, if any, to the observed alteration in LPS are unknown.
The Curvature of the Determinant Line Bundle on the Noncommutative Two Torus
Creators: name: Fathi, Ali
name: Ghorbanpour, Asghar
name: Khalkhali, Masoud
Publisher: name: arXiv
Year: 2014
Subjects: subject: Quantum Algebra (math.QA)
subject: Differential Geometry (math.DG)
subject: Operator Algebras (math.OA)
subject: Spectral Theory (math.SP)
subject: FOS: Mathematics
subject: 46L87, 58B34, 58J42

description: We compute the curvature of the determinant line bundle on a family of Dirac operators for a noncommutative two torus. Following Quillen's original construction for Riemann surfaces and using zeta regularized determinant of Laplacians, one can endow the determinant line bundle with a natural Hermitian metric. By using an analogue of Kontsevich-Vishik canonical trace, defined on Connes' algebra of classical pseudodifferential symbols for the noncommutative two torus, we compute the curvature form of the determinant line bundle by computing the second variation $δ_{w}δ_{\bar{w}}\log\det(Δ)$.
description: 18 pages
Depletion of atmospheric neutrino fluxes from parton energy loss
Creators: name: Arleo, François
name: Jackson, Greg
name: Peigné, Stéphane
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: The phenomenon of fully coherent energy loss (FCEL) in the collisions of protons on light ions affects the physics of cosmic ray air showers. As an illustration, we address two closely related observables: hadron production in forthcoming proton-oxygen collisions at the LHC, and the atmospheric neutrino fluxes induced by the semileptonic decays of hadrons produced in proton-air collisions. In both cases, a significant nuclear suppression due to FCEL is predicted. The conventional and prompt neutrino fluxes are suppressed by $\sim 10...25\%$ in their relevant neutrino energy ranges. Previous estimates of atmospheric neutrino fluxes should be scaled down accordingly to account for FCEL.
description: 5 pages, 4 figures
Россия,Китай и контуры «Большого евразийского партнерства»
Creators: name: Петровский Владимир Евгеньевич
Publisher: name: Китай в мировой и региональной политике. История и современность
Year: 2017
Subjects: БОЛЬШОЕ ЕВРАЗИЙСКОЕ ПАРТНЕРСТВО
ЕВРАЗИЙСКИЙ ЭКОНОМИЧЕСКИЙ СОЮЗ (ЕАЭС)
ЭКОНОМИЧЕСКИЙ ПОЯС ШЕЛКОВОГО ПУТИ (ЭПШП)
ШАНХАЙСКАЯ ОРГАНИЗАЦИЯ СОТРУДНИЧЕСТВА (ШОС)
МЕЖБЛОКОВЫЕ ТОРГОВО-ЭКОНОМИЧЕСКИЕ ПАРТНЕРСТВА
ЗОНЫ СВОБОДНОЙ ТОРГОВЛИ (ЗСТ)

description: Концепция «Большого евразийского партнерства» (далее БЕП), вызвавшая неподдельный интерес не только в России, но и в Китае, становится предметом дискуссий и исследований в академической и экспертной среде. Ее концептуализация и научное обоснование происходят на фоне осмысления более общих геоэкономических и геополитических представлений, связанных с развитием и обустройством Большой Евразии. В настоящее время процесс сопряжения интеграционных процессов в рамках ЕАЭС и ЭПШП является наиболее важным содержательным компонентом процесса формирования БЕП. Скорее всего, оно будет представлять собой набор межблоковых торгово-экономических партнерств, сеть зон свободной торговли. Сопоставительный анализ вызовов, рисков и возможностей для России и Китая в Евразии показывает, что российские и китайские инициативы в Центральной Евразии не рассматриваются как взаимоисключающие, поскольку их содержание не предполагает обязательного выбора одного из разных институционально-правовых форматов (ЕАЭС и ЭПШП).
Mutagenic frequencies of site-specifically located O6-methylguanine in wild-type Escherichia coli and in a strain deficient in ada-methyltransferase.
Creators: name: Rossi, S C
name: Topal, M D
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 1991

description: The adaptive response of Escherichia coli involves protection of the cells against the toxic and mutagenic consequences of exposure to high doses of a methylating agent by prior exposure to low doses of the agent. Ada protein, a major repair activity for O6-methylguanine, is activated to positively control the adaptive response; O6-methylguanine is one of the major mutagenic lesions produced by methylating agents. We investigated the mutation frequency of wild-type Escherichia coli and strains containing the ada-5 mutation in response to site-specifically synthesized O6-methylguanine under conditions in which the adaptive response was not induced. Site-directed mutagenesis and oligonucleotide self-selection techniques were used to isolate the progeny of M13mp18 DNAs constructed to contain O6-methylguanine at any of eight different positions. The progeny were isolated from E. coli strains isogeneic except for deficiency in Ada-methyltransferase repair, UvrABC excision repair, or both. The resulting O6-methylguanine mutation levels at each position were determined by using differential oligonucleotide hybridization. We found that the wild type had up to a 2.6-fold higher mutation frequency than ada-5 mutants. In addition, the mutation frequency varied with the position of the O6-methylguanine in the DNA in the wild type but not in ada-5 mutants; O6-methylguanine lesions at the 5' ends of runs of consecutive guanines gave the highest mutation frequencies. Determination of the mutation frequency of O6-methylguanine in wild-type and mutS cells showed that mismatch repair can affect O6-methylguanine mutation levels.
Block Free Optical Quantum Banyan Network based on Quantum State Fusion and Fission
Creators: name: Zhu, Chang-Hua
name: Meng, Yan-Hong
name: Quan, Dong-Xiao
name: Zhao, Nan
name: Pei, Chang-Xing
Publisher: name: arXiv
Year: 2014
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Optical switch fabric plays an important role in building multiple-user optical quantum communication networks. Owing to its self-routing property and low complexity, Banyan network is widely used for building switch fabric. While, there is no efficient way to remove internal blocking in Banyan network by classical way. Quantum state fusion, by which the two-dimensional internal quantum state of two photons could be combined into four-dimensional internal state of a single photon, makes it possible to solve this problem. In this paper, we convert the output mode of quantum state fusion from spatial-polarization mode to time-polarization mode. By combining modified quantum state fusion, quantum state fission with quantum Fredkin gate, we propose a practical scheme to build an optical quantum switch unit which is block free. The scheme can be extended to build more complex units, four of which are shown in this paper.
description: 15 pages, 6 figures