cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Some non-renormalization theorems in Curci-Ferrari model
Creators: name: Wschebor, Nicolas
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: In the present letter, a particular form of Slavnov-Taylor identities for the Curci-Ferrari model is deduced. This model consist of Yang-Mills theory in a particular non-linear covariant gauge, supplemented with mass terms for gluons and ghosts. It can be used as a regularization for the Yang-Mills theory preserving simple Slavnov-Taylor identities. Employing these identities two non-renormalization theorems are proved that reduce the number of independent renormalization factors from five to three. These new relations are verified by comparing to the already known three-loops renormalization factors. These relations include, as a particular case, the corresponding known identities in Yang-Mills theory in Landau gauge.
description: 14 pages, some references added, some improvement in explanations and some misprints corrected
Compensation of Effective Field in the Field-Induced Superconductor k-(BETS)2FeBr4 Observed by 77Se NMR
Creators: name: Fujiyama, S.
name: Takigawa, M.
name: Kikuchi, J.
name: Cui, H-B.
name: Fujiwara, H.
name: Kobayashi, H.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We report results of 77Se NMR frequency shift in the normal state of the organic charge-transfer-salt k-(BETS)2FeBr4 which shows magnetic field-induced superconductivity (FISC). From a simple mean field analysis, we determined the field and the temperature dependences of the magnetization m_{pi} of the πconduction electrons on BETS molecules. We found that the Fe spins are antiferromagnetically coupled to the pi electrons and determined the exchange field to be J = -2.3T/mu_B. The exchange field from the fully saturated Fe moments (5 mu_B) is compensated by an external field of 12T. This is close to the central field of the FISC phase, consistent with the Jaccarino-Peter local field-compensation mechanism for FISC (Phys. Rev. Lett. 9, 290 (1962)).
Treating the Future Equally: Solving Undiscounted Infinite Horizon Optimization Problems
Creators: name: Cai, Dapeng
name: Nitta, Gyoshin
Publisher: name: arXiv
Year: 2007
Subjects: subject: Optimization and Control (math.OC)
subject: FOS: Mathematics

description: Infinite horizon optimization problems accompany two perplexities. First, the infinite series of utility sequences may diverge. Second, boundary conditions at the infinite terminal time may not be rigorously expressed. In this paper, we show that under two fairly general conditions, the limit of the solution to the undiscounted finite horizon problem is optimal among feasible paths for the undiscounted infinite horizon problem, in the sense of the overtaking criterion. Applied to a simple Ramsey model, we show that the derived path contains intriguing properties. We also comprehend the legitimacy of the derived paths by addressing the perplexities with non-standard arguments.
description: 40 pages
Professor Dr. Engr. Md. Anowar Hossain, Scientist represented his photographic memories of profession in textile engineering and casual life journey
Creators: name: MD.Anowar, Hossain
Publisher: name: Zenodo
Year: 2024

description: Keynote of picture memories of Professor Dr. Engr. Md. Anowar Hossain, Scientist

The day was 31 December 2023, 37th birthday of Professor Dr. Engr. Md. Anowar Hossain, Scientist.  I was pulling my picture memories in my laptop storage. I made a picture gallery by my picture memories of my profession and casual life journey. Professor Dr. Engr. Md. Anowar Hossain attached, cited and ignited his picture memories in Calcutta University (2013-2015), City University (2017-2020), RMIT University (2020-2024), Newcastle University college (2016-2017), BCMC college (2015-2016), Chittagong Park (2016), Jessore Park (2015-2016), Melbourne Park (2020), Chittagong Sea beach (2016), Melbourne Sea beach (2021), Bangladesh Textile & Fashion (2016) and family/personal Office in Bangladesh & Australia (2020-2024). Dr. Engr. Md. Anowar Hossain represented his bygone memories with office colleagues, professors, students. Dr. Md. Anowar Hossain focused and cited his dress code in different professional & casual moment of his life journey when he proposed research about dress code standardization in different professions. There are also related pictures about textile and research technologies.
Power Law of Customers' Expenditures in Convenience Stores
Creators: name: Mizuno, Takayuki
Publisher: name: arXiv
Year: 2008
Subjects: subject: Physics and Society (physics.soc-ph)
subject: FOS: Physical sciences

description: In a convenience store chain, a tail of the cumulative density function of the expenditure of a person during a single shopping trip follows a power law with an exponent of -2.5. The exponent is independent of the location of the store, the shopper's age, the day of week, and the time of day.
description: 9 pages, 5 figures. Accepted for publication in Journal of the Physical Society of Japan Vol.77No.3
Measurement of breast-tissue x-ray attenuation by spectral mammography: first results on cyst fluid
Creators: name: Fredenberg, Erik
name: Dance, David R.
name: Willsher, Paula
name: Moa, Elin
name: von Tiedemann, Miriam
name: Young, Kenneth C.
name: Wallis, Matthew G.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Medical Physics (physics.med-ph)
subject: Image and Video Processing (eess.IV)
subject: FOS: Physical sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Knowledge of x-ray attenuation is essential for developing and evaluating x-ray imaging technologies. For instance, techniques to better characterize cysts at mammography screening would be highly desirable to reduce recalls, but the development is hampered by the lack of attenuation data for cysts. We have developed a method to measure x-ray attenuation of tissue samples using a prototype photon-counting spectral mammography unit. The method was applied to measure the attenuation of 50 samples of breast cyst fluid and 50 samples of water. Spectral (energy-resolved) images of the samples were acquired and the image signal was mapped to equivalent thicknesses of two known reference materials, which can be used to derive the x-ray attenuation as a function of energy. The attenuation of cyst fluid was found to be significantly different from water. There was a relatively large natural spread between different samples of cyst fluid, whereas the homogeneity of each individual sample was found to be good; the variation within samples did not reach above the quantum noise floor. The spectral method proved stable between several measurements on the same sample. Further, chemical analysis and elemental attenuation calculation were used to validate the spectral measurement on a subset of the samples. The two methods agreed within the precision of the elemental attenuation calculation over the mammographic energy range.
description: arXiv admin note: substantial text overlap with arXiv:2101.02449
On the radio properties of the highest redshift quasars
Creators: name: Cirasuolo, M.
name: Magliocchetti, M.
name: Gentile, G.
name: Celotti, A.
name: Cristiani, S.
name: Danese, L.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present deep radio observations of the most distant complete quasar sample drawn from the Sloan Digital Sky Survey. Combining our new data with those from literature we obtain a sample which is ~100 per cent complete down to S_1.4GHz = 60 μJy over the redshift range 3.8 < z < 5. The fraction of radio detections is relatively high (~43 per cent), similar to what observed locally in bright optical surveys. Even though the combined radio and optical properties of quasars remain overall unchanged from z ~ 5 to the local Universe, there is some evidence for a slight over-abundance of radio-loud sources at the highest redshifts when compared with the lower-z regime. Exploiting the deep radio VLA observations we present the first attempt to directly derive the radio luminosity function of bright quasars at z ~ 4. The unique depth -- both in radio and optical -- allows us to thoroughly explore the population of optically bright FR~II quasars up to z ~ 5 and opens a window on the behaviour of the brightest FR~I sources. A close investigation of the space density of radio loud quasars also suggests a differential evolution, with the more luminous sources showing a less pronounced cut-off at high z when compared with the less luminous ones.
description: Accepted for publication in MNRAS, 8 pages, 6 figures
Characterization of the pim-1 oncogene-encoded protein kinase
Creators: name: Palaty, Chrystal K.
Publisher: name: University of British Columbia
Year: 2009

description: Pim-1 is an oncogene-encoded serine-threonine kinase, expressed primarily in hematopoietic and germ cells. Previously identified only in mammalian systems, pim-1 was cloned and sequenced from Xenopus laevis, the African clawed frog. The coding region of X. laevis Pim-1 encoded a protein of 324 amino acids, which exhibited 64% amino acid sequence identity with the full-length human protein. PCR was also used to demonstrate the existence of Pim-1 in Pisaster ochraceus, the purple sea star. The high sequence conservation observed in the catalytic domain of Pim-1 between divergent species support a conserved and important function for this kinase. The full-length coding regions of both human and X. laevis Pim-1 were expressed as recombinant bacterial fusion proteins which exhibited phosphotransferase activity towards exogenous substrates as well as serine, threonine and tyrosine autophosphorylation activity. A kinase-inactive mutant was engineered to serve as a negative control. The phosphorylation site consensus sequence for recognition by Pim-1 was defined by stepwise alterations in the amino acid sequences of peptide substrate analogues to determine which of the amino acid residues surrounding the substrate phosphorylation site were critical for kinase recognition. The optimal substrate peptide for Pim-1 was determined to be K/R - K/R - R - K/R - L – S/T - X, where X is an amino acid residue with a small side chain. Studies were undertaken to determine the autophosphorylation sites of the GST-Pim-1 kinase, using electron spray ionization mass spectroscopy (ESI-MS). The autophosphorylation sites of the GST-Pim-1 were identified as Ser-4, Ser-190 and Thr- 205. These sites were conserved amongst all Pim-1 homologues. An additional site was identified on the GST protein, Thr-17. To assess the importance of the Ser-190 site on phosphotransferase activity, the Ser-190 residue was changed to alanine and to glutamic acid using PCR site-directed mutagenesis. These mutants were expressed in bacteria as GST-fusion proteins, and their activites were compared to the wild-type. Together with Pim-1-specific antibodies, the optimal Pim-1 peptide substrate was used to study endogenous Pim-1 during X. laevis and P. ochracheus oocyte maturation. Pim-1 did not exhibit maturation-induced activation in sea star oocytes and the quantity of Pim-1 remained constant during the oocyte maturation process. This is the first study carried out to investigate this kinase in the oocyte system.
Three-Particle Azimuthal Correlations
Creators: name: Ulery, Jason Glyndwr
Publisher: name: arXiv
Year: 2006
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: Two-particle azimuthal correlations reveal broadened and softened away-side correlations. Several different physics mechanisms are possible: large angle gluon radiation, deflected jets, and conical flow or Cerenkov radiation. Three-particle correlations are investigated to try to discriminate these mechanisms. We present results on 3-particle azimuthal correlations between a trigger particle of 3
description: Talk given at Hard Probes 2006, Pacific Grove, California. 4 Pages, 3 Figures
Simple and compact diode laser system stabilized to Doppler-broadened iodine-lines at 633 nm
Creators: name: Krause, Florian
name: Benkler, Erik
name: Nölleke, Christian
name: Leisching, Patrick
name: Sterr, Uwe
Publisher: name: arXiv
Year: 2020
Subjects: subject: Optics (physics.optics)
subject: Instrumentation and Detectors (physics.ins-det)
subject: FOS: Physical sciences

description: We present a compact iodine-stabilized laser system at 633 nm, based on a distributed-feedback laser diode. Within a footprint of $27\times 15$ cm$^2$ the system provides 5 mW of frequency stabilized light from a single-mode fiber. Its performance was evaluated in comparison to Cs clocks representing primary frequency standards, realizing the SI unit Hz via an optical frequency comb. With the best suited absorption line the laser reaches a fractional frequency instability below $10^{-10}$ for averaging times above 10 s. The performance was investigated at several iodine lines and a model was developed to describe the observed stability on the different lines.
description: 9 pages, 5 figures, accepted for publication in Applied Optics
Vacuum Sampling in the Landscape during Inflation
Creators: name: Davoudiasl, Hooman
name: Sarangi, Sash
name: Shiu, Gary
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We consider the phenomenological consequences of sampling multiple vacua during inflation motivated by an enormous landscape. A generic consequence of this sampling is the formation of domain walls, characterized by the scale $μ$ of the barriers that partition the accessed vacua. We find that the success of Big Bang Nucleosynthesis (BBN) implies $μ\gsim 10$ TeV, as long as the sampled vacua have a non-degeneracy larger than $\cal{O}({\rm MeV}^{\rm 4})$. Otherwise, the walls will dominate and eventually form black holes that must reheat the universe sufficiently for BBN to take place; in this case, we obtain $μ\gsim 10^{-5}M_P$. These black holes are not allowed to survive and contribute to cosmic dark matter density.
description: 4 pages. Abstract changed. New results and conclusion added
Combining pretrained CNN feature extractors to enhance clustering of complex natural images
Creators: name: Guerin, Joris
name: Thiery, Stephane
name: Nyiri, Eric
name: Gibaru, Olivier
name: Boots, Byron
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Recently, a common starting point for solving complex unsupervised image classification tasks is to use generic features, extracted with deep Convolutional Neural Networks (CNN) pretrained on a large and versatile dataset (ImageNet). However, in most research, the CNN architecture for feature extraction is chosen arbitrarily, without justification. This paper aims at providing insight on the use of pretrained CNN features for image clustering (IC). First, extensive experiments are conducted and show that, for a given dataset, the choice of the CNN architecture for feature extraction has a huge impact on the final clustering. These experiments also demonstrate that proper extractor selection for a given IC task is difficult. To solve this issue, we propose to rephrase the IC problem as a multi-view clustering (MVC) problem that considers features extracted from different architectures as different "views" of the same data. This approach is based on the assumption that information contained in the different CNN may be complementary, even when pretrained on the same data. We then propose a multi-input neural network architecture that is trained end-to-end to solve the MVC problem effectively. This approach is tested on nine natural image datasets, and produces state-of-the-art results for IC.
description: 21 pages, 16 figures, 10 tables, preprint of our paper published in Neurocomputing
Quantum annealing simulation of out-of-equilibrium magnetization in a spin-chain compound
Creators: name: King, Andrew D.
name: Batista, Cristian D.
name: Raymond, Jack
name: Lanting, Trevor
name: Ozfidan, Isil
name: Poulin-Lamarre, Gabriel
name: Zhang, Hao
name: Amin, Mohammad H.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Geometrically frustrated spin-chain compounds such as Ca3Co2O6 exhibit extremely slow relaxation under a changing magnetic field. Consequently, both low-temperature laboratory experiments and Monte Carlo simulations have shown peculiar out-of-equilibrium magnetization curves, which arise from trapping in metastable configurations. In this work we simulate this phenomenon in a superconducting quantum annealing processor, allowing us to probe the impact of quantum fluctuations on both equilibrium and dynamics of the system. Increasing the quantum fluctuations with a transverse field reduces the impact of metastable traps in out-of-equilibrium samples, and aids the development of three-sublattice ferrimagnetic (up-up-down) long-range order. At equilibrium we identify a finite-temperature shoulder in the 1/3-to-saturated phase transition, promoted by quantum fluctuations but with entropic origin. This work demonstrates the viability of dynamical as well as equilibrium studies of frustrated magnetism using large-scale programmable quantum systems, and is therefore an important step toward programmable simulation of dynamics in materials using quantum hardware.
ZAMONAVIY KAMPYUTERLARNING DASTURIY TA'MINOTI VA ULARNING RIVOJLANISH TENDENSIYALARI
Creators: name: Goyibova, G.G.
name: Tojimamatov, I.N.
Publisher: name: Zenodo
Year: 2024

description: Ushbu tezisda zamonaviy kampyuterlarning dasturiy ta’minoti va ularning rivojlanish tendensiyalari va dasturiy ta’minot va tizimli dasturiy ta’minot o’rtasida o’zaro bevosita aloqalar  haqida so’z boradi.
Relaxion Dark Matter
Creators: name: Morgante, Enrico
Publisher: name: Deutsches Elektronen-Synchrotron, DESY, Hamburg
Year: 2019

description: Seminar, LPTHE Paris, 18 Jun 2019
description: The relaxion mechanism is a proposed solution to the SM hierarchy problem, in which the smallness of the EW scale is determined by the classical evolution of a scalar field in the early universe. I will review this construction and discuss a scenario in which the relaxion field constitutes the Dark Matter of the Universe.
A critical analysis of Donald Davidson’s philosophy of action
Creators: name: McGuire, John Michael
Publisher: name: University of British Columbia
Year: 2009

description: This thesis is a critical examination of three influential and interrelated aspects of Donald Davidson’s philosophy of action.. The first issue that is considered is Davidson’s account of the logical form of action—sentences. After assessing the argument in support of Davidson’s account, and suggesting certain amendments to it, I show how this modified version of Davidson’s account can be extended to provide for more complicated types of action—sentences. The second issue that is considered is Davidson’s views concerning the individuation of actions; in particular, I examine Davidson’s theory concerning the ontological implications of those sentences that assert that an agent did something by means of doing something else. The conclusion that I seek to establish in this case is essentially negative—that Davidson’s theory is false. The third issue that is considered is Davidson’s theory concerning the logical implications of those sentences that assert that an agent did something as a means of doing something else, which is also commonly known as the causal theory of action. Here I argue against Davidson’s view by providing an alternative, and more satisfying response to the theoretical challenge that generates the causal theory. Subsequent to this I attempt to explain what motivates Davidson’s commitment to the causal theory.
Decoherence and Matter Wave Interferometry
Creators: name: Qureshi, Tabish
name: Venugopalan, Anu
Publisher: name: arXiv
Year: 2006
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: A two-slit interference of a massive particle in the presence of environment induced decoherence is theoretically analyzed using a fully quantum mechanical calculation. The Markovian Master equation, derived from coupling the particle to a harmonic-oscillator heat bath, is used to obtain exact solutions which show the existence of an interference. Interestingly, decoherence does not affect the pattern, but only leads to a reduction in the fringe visibility.
description: Sufficiently revised version, to appear in Int. J. Mod. Phys. B
Spectral Function and Kinetic Equation for Normal Fermi Liquid
Creators: name: Arshad, M.
name: Kondratyev, A. S.
name: Siddique, Imran
Publisher: name: arXiv
Year: 2007
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: On the basis of the Kadanoff-Baym (KB) varient of the time dependent Green's function method a new ansatz for the approximation of a spectral function is offered. The ansatz possesses all the advantages of quasiparticle (QP) and extended quasiparticle (EQP) approximations and satisfies the KB equation for a spectral function in the case of slightly nonequilibrium system when disturbances in space and time are taken into consideration in the gradient approximation. This feature opens new opportunities for the microscopic derivation of the Landau kinetic equation for the quasiparticle distribution function of the normal fermi liquid and provides the widening of these equation's temperature rang of validity.
description: 10 pages, NO figures
Realization of electron antidoping by modulating the breathing distortion in BaBiO$_3$
Creators: name: Cao, Hui
name: Guo, Hongli
name: Shao, Yu-Cheng
name: Liu, Qixin
name: Feng, Xuefei
name: Lu, Qinwen
name: Wang, Zhengping
name: Zhao, Aidi
name: Fujimori, Atsushi
name: Chuang, Yi-De
name: Zhou, Hua
name: Zhai, Xiaofang
Publisher: name: arXiv
Year: 2021
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The recent proposal of antidoping scheme breaks new ground in conceiving conversely functional materials and devices, yet the few available examples belong to the correlated electron systems. Here we demonstrate both theoretically and experimentally that the main group oxide BaBiO$_3$ is a model system for antidoping using oxygen vacancies. The first principles calculations show that the band gap systematically increases due to the strongly enhanced BiO breathing distortions away from the vacancies and the annihilation of Bi 6s and O 2p hybridized conduction bands near the vacancies. The spectroscopic experiments confirm the band gap increasing systematically with electron doping, with a maximal gap enhancement of 75% when the film's stoichiometry is reduced to BaBiO$_{2.75}$. The Raman and diffraction experiments show the suppression of the overall breathing distortion. The study unambiguously demonstrates the remarkable antidoping effect in a material without strong electron correlations and underscores the importance of bond disproportionation in realizing such an effect.
Large-scale structure of Lyman break galaxies around a radio galaxy protocluster at z~4
Creators: name: Intema, H. T.
name: Venemans, B. P.
name: Kurk, J. D.
name: Ouchi, M.
name: Kodama, T.
name: Rottgering, H. J. A.
name: Miley, G. K.
name: Overzier, R. A.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present broad-band imaging with the Subaru Telescope of a 25'x25' field surrounding the radio galaxy TN J1338-1942 at redshift z=4.1. The field contains excesses of Lyman-alpha emitters (LAEs) and Lyman break galaxies (LBGs) identified with a protocluster surrounding the radio galaxy. Our new wide-field images provide information about the boundary of the protocluster and its surroundings. There are 874 candidate LBGs within our field, having redshifts in the range z=3.5-4.5. An examination of the brightest of these (with i'< 25.0) shows that the most prominent concentration coincides with the previously discovered protocluster. The diameter of this galaxy overdensity corresponds to ~2 Mpc at z=4, consistent with the previous estimation using LAEs. Several other concentrations of LBGs are observed in the field, some of which may well be physically connected with the z=4.1 protocluster. The observed structure in the smoothed LBG distribution can be explained as the projection of large-scale structure, within the redshift range z=3.5-4.5, comprising compact overdensities and prominent larger voids. If the 5-8 observed compact overdensities are associated with protoclusters, the observed protocluster volume density is ~5x10^-6 Mpc^-3, similar to the volume density of rich clusters in the local Universe.
description: 5 pages, 4 figures. Accepted for publication in A&A. Full resolution version available at http://www.strw.leidenuniv.nl/~intema/files/AA_2006_4812.zip
Theory of conserved spin current and its application to two dimensional hole gas
Creators: name: Zhang, Ping
name: Wang, Zhigang
name: Shi, Junren
name: Xiao, Di
name: Niu, Qian
Publisher: name: arXiv
Year: 2007
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We present a detailed microscopic theory of the conserved spin current which is introduced by us [Phys. Rev. Lett. \textbf{96}, 196602 (2006)] and satisfies the spin continuity equation even for spin-orbit coupled systems. The spin transport coefficients $σ_{μν}^{s}$ as a response to the electric field are shown to consist of two parts, i.e., the conventional part $σ_{μν}^{s0}$ and the spin torque dipole correction $σ_{μν}^{sτ}$. As one key result, an Onsager relation between $σ_{μν}^{s}$ and other kinds of transport coefficients are shown. The expression for $σ_{μν}^{s}$ in terms of single-particle Bloch states are derived, by use of which we study the conserved spin Hall conductivity in the two dimensional hole gas modeled by a combined Luttinger and SIA Rashba spin-orbit coupling. It is shown that the two components in spin Hall conductivity usually have the opposite contributions. While in the absence of Rashba spin splitting, the spin Hall transport is dominated by the conventional contribution, the presence of Rashba spin splitting stirs up a large enhancement of the spin torque dipole correction, leading to an overall sign change for the total spin Hall conductivity. Furthermore, an approximate two-band calculation and the subsequent comparison with the exact four-band results are given, which reveals that the coupling between the heavy hole and light hole bands should be taken into account for strong Rashba spin splitting.
description: 10 pages, 4 figures
Next-to-next-to-leading order ${\cal O}(α_s^4)$ results for heavy quark pair production in quark--antiquark collisions: The one-loop squared contributions
Creators: name: Körner, J. G.
name: Merebashvili, Z.
name: Rogal, M.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We calculate the next-to-next-to-leading order ${\cal O}(α_s^4)$ one-loop squared corrections to the production of heavy quark pairs in quark-antiquark annihilations. These are part of the next-to-next-to-leading order ${\cal O}(α_s^4)$ radiative QCD corrections to this process. Our results, with the full mass dependence retained, are presented in a closed and very compact form, in the dimensional regularization scheme. We have found very intriguing factorization properties for the finite part of the amplitudes.
description: 12 pages, 2 figures, electronic results file, abbreviation NNLO in Title and Abstract expanded, Summary expanded, reference updated, version to appear in Phys.Rev.D
Near-field radiative heat transfer between one-dimensional magneto-photonic crystals
Creators: name: Moncada-Villa, E.
name: Cuevas, J. C.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Optics (physics.optics)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We present a theoretical study of the effect of an external dc magnetic field in the near-field radiative heat transfer between two one-dimensional magneto-photonic crystals with unit cells comprising a magneto-optical layer made of n-doped InSb and a dielectric layer. We find that in absence of an external field, and depending on the gap size, the radiative heat transfer between these multilayer structures can be larger or smaller than that of the case of two InSb infinite plates. On the other hand, when an external magnetic field is applied, the near-field radiative heat transfer is reduced as a consequence of the suppression of hybridized surface polariton waves that are supported for transverse magnetic polarized light. We show that such reduction is exclusively due to the appearance of magnetic-field induced hyperbolic modes, and not to the polarization conversion in this magneto-optical system.
First-principles calculations of Cu(001) thin films: quantum size effect in surface energetics and surface chemical reactivities
Creators: name: Sun, Bo
name: Zhang, Ping
name: Duan, Suqing
name: Zhao, Xian-Geng
name: Shi, Junren
name: Xue, Qi-Kun
Publisher: name: arXiv
Year: 2007
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: First-principles calculations of Cu(001) free-standing thin films have been performed to investigate the oscillatory quantum size effects exhibited in surface energy, work function, atomic relaxation, and adsorption energy of the cesium adsorbate. The quantum well states have been shown and clarified at particular $k$-points corresponding to the stationary extrema in bulk Brillouin zone, which are in good agreement with experimental observations. The calculated surface energetics and geometry relaxations are clearly featured by quantum oscillations as a function of the film thickness of the film with oscillation periods characterized by a superposition of long and short length scales. Furthermore, we have investigated Cs adsorption onto Cu(001) thin films as a function of the film thickness. Our systematic calculated results clearly show the large-amplitude quantum oscillations in adsorption energetics, which may be used to tailor catalysis, chemical reactions and other surface processes in nanostructured materials.
description: 12 pages, 4 figures
Σύνθεση και μελέτη ιδιοτήτων των νανοσύνθετων υλικών του πολυ(στυρενίου-μεθακρυλικού μεθυλεστέρα) με οργανικά τροποποιημένο μοντμοριλλονίτη:
Creators: name: Μποζάνη, Βασιλική Στέργιου
Publisher: name: Aristotle University of Thessaloniki
Year: 2011
Subjects: Νανοσύνθετα υλικά
Πολυ(στυρένιο-μεθακρυλικός μεθυλεστέρας)
Μοντμοριλλονίτης
Nanocomposites
Poly(styrene-co-methyl methacrylate)
Montmorillonite

description: Στην παρούσα εργασία παρουσιάζεται η σύνθεση και η μελέτη ιδιοτήτων νανοσύνθετων υλικών, τα οποία αποτελούνται από νανοσωματίδια με τη μορφή τροποποιημένου μοντμοριλλονίτη εγκλωβισμένα σε πολυμερική μήτρα πολυστυρενίου, πολυ(μεθακρυλικού μεθυλεστέρα) και συμπολυμερών πολυ(στυρενίου-μεθακρυλικού μεθυλεστέρα) σε αναλογίες 52/48 και 20/80. Η τεχνική σύνθεσης που χρησιμοποιήθηκε είναι ο απ΄ευθείας (in situ) πολυμερισμός μάζας. Στο πρώτο στάδιο της έρευνας έγινε η σύνθεση των νανοσύνθετων υλικών και στο δεύτερο στάδιο ακολούθησε ο χαρακτηρισμός τους. Ο χαρακτηρισμός περιελάμβανε μελέτη των χαρακτηριστικών δονήσεων των δραστικών ομάδων των υλικών με FT-IR, θερμική ανάλυση με TGA, προσδιορισμό της θερμοκρασίας υαλώδους μετάβασης (Tg) με DSC, προσδιορισμό του μοριακού βάρους και της κατανομής μοριακών βαρών με GPC και τέλος προσδιορισμό της δομής με ακτίνες–Χ.
description: In this research, synthesis of nanocomposites based on poly(styrene-co-methyl methacrylate) copolymer matrix was investigated with different types and amounts of, commercially available, organomodified MMT clays under the trade name Cloisite. The in situ bulk polymerization technique was followed. The main objective was to investigate if free radical polymerization kinetics is affected by the presence of montmorillonite nanoparticles. Reaction kinetics was measured using Differential Scanning Calorimetry (DSC) by recording the amount of heat released versus time under isothermal conditions and eventually calculating the time evolution of polymerization rate and monomer conversion. The gravimetric technique to monitor monomer conversion during polymerization at prespecified time intervals was also examined and the results were compared. The structure and morphological characteristics of the nano-hybrids produced was verified by means of X-Ray diffraction (XRD) and FT-IR spectroscopy. Their glass transition temperature was measured with DSC. The average molecular weights and the full molecular weight distribution of the materials formed was measured with Gel Permeation Chromatography (GPC). Their thermal stability and degradation kinetics was investigated using Thermogravimetric analysis (TGA).
Holding the Cosmos in Your Hand: Developing 3D Modeling and Printing Pipelines for Communications and Research
Creators: name: Arcand, Kimberly Kowal
name: Price, Sara Rose
name: Watzke, Megan
Publisher: name: arXiv
Year: 2020
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Three-dimensional (3D) visualization has opened up a Universe of possible scientific data representations. 3D printing has the potential to make seemingly abstract and esoteric data sets accessible, particularly through the lens of translating data into forms that can be explored in the tactile modality for people who are blind or visually impaired. This article will briefly review 3D modeling in astrophysics, astronomy, and planetary science, before discussing 3D printed astrophysical and planetary geophysical data sets and their current and potential applications with non-expert audiences. The article will also explore the prospective pipeline and benefits of other 3D data outputs in accessible scientific research and communications, including extended reality and data sonification.
description: 16 pages
Hybrid simulations of mini-magnetospheres in the laboratory
Creators: name: Gargaté, L.
name: Bingham, R.
name: Fonseca, R. A.
name: Bamford, R.
name: Thornton, A.
name: Gibson, K.
name: Bradford, J.
name: Silva, L. O.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Space Physics (physics.space-ph)
subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: Solar energetic ions are a known hazard to both spacecraft electronics and to manned space flights in interplanetary space missions that extend over a long period of time. A dipole-like magnetic field and a plasma source, forming a mini magnetosphere, are being tested in the laboratory as means of protection against such hazards. We investigate, via particle-in-cell hybrid simulations, using kinetic ions and fluid electrons, the characteristics of the mini magnetospheres. Our results, for parameters identical to the experimental conditions, reveal the formation of a mini-magnetosphere, whose features are scanned with respect to the plasma density, the plasma flow velocity, and the intensity of the dipole field. Comparisons with a simplified theoretical model reveal a good qualitative agreement and excellent quantitative agreement for higher plasma dynamic pressures and lower B-fields.
Functioning of the Rain Gardens
Creators: name: Pollert, Jaroslav
name: Pollert, Jaroslav Sr.
name: Wanner, Jiří
name: Pečenka, Martin
name: Puškáčová, Adéla
name: Růžičková, Iveta
name: Strogonov, Vadim
name: Kovařík, Jakub
Publisher: name: Zenodo
Year: 2024
Subjects: Wastewater reuse
Irrigation
Water recycling and reuse
Environment, resources and sustainability
Circular economy
Sustainability transition
Symbiosis between industry and water utilities

description: This study aimed to explore the feasibility and potential benefits of using treated CWWTP effluent for irrigating plants in an urban environment. Four irrigation boxes were set up to assess plant growth and health using different water sources, including river water and treated effluent. Water quality, trace elements, microbiological parameters, and micropollutants were monitored over two seasons. The results demonstrated the viability of using treated effluent for irrigation, as water quality parameters remained within legislative limits, and plant growth and health showed no significant differences between the boxes. Nutrient levels in the treated effluent were higher than in river water, benefiting plant growth. Accumulation of trace elements and micropollutants in plants was minimal and deemed negligible for non-edible plants. In conclusion, the study showed that treated effluent can be a sustainable alternative to conventional drinking water uptake for irrigation, contributing to a more environmentally friendly approach to urban water management.
Σύνθεση και χαρακτηρισμός ανιονικού χρώματος συμπλόκου με κοβάλτιο για τη βαφή πρωτεϊνικών και πολυαμιδικών ινών:
Creators: name: Δημητριάδου, Σταματία Μιχαήλ
Publisher: name: Aristotle University of Thessaloniki
Year: 2011
Subjects: Αζωβαφές
Υφάνσιμες ίνες
Σύμπλοκα του κοβαλτίου
Azodyes
Textile fibers
Cobalt complexes

description: Έγινε σύνθεση ενός νέου αζωχρώματος συμπλόκου του κοβαλτίου ως υποκατάστατο του υπάρχοντος συμπλόκου με χρώμιο. Το αζώχρωμα καθώς και το σύμπλοκο του αζωχρώματος με κοβάλτιο χαρακτηρίστηκαν με τη λήψη των φασμάτων NMR, FT-IR, UV-vis και με την εύρεση του σημείου τήξεως. Ακολούθως το αζώχρωμα και το σύμπλοκο του αζωχρώματος με κοβάλτιο χρησιμοποιήθηκαν για την παρασκευή μελανών και τη βαφή μάλλινων και πολυαμιδικών ινών. Διεξήχθη μέτρηση και αξιολόγηση των τιμών L, a, b, C, H, K/S των δειγμάτων και μετρήθηκε η αντοχή τους στο φως και στο πλύσιμο.
description: Initially a new azodye complex with cobalt was synthesized as a substitute for the azodye complex with chromium. The azodye and the complex were characterized with FT-IR, NMR, UV-vis spectroscopy. The melting point of the compounds was determined. Moreover, the azodye and the cobalt complex where used for making inks and dying wool and polyamide fiber samples. The parameters L, a, b, c, H, K/S of the samples as well as their stability were measured.
Spin photogalvanic effect in two-dimensional collinear antiferromagnets
Creators: name: Xiao, Rui-Chun
name: Shao, Ding-Fu
name: Li, Yu-Hang
name: Jiang, Hua
Publisher: name: arXiv
Year: 2020
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Spin photogalvanic effect (SPGE) is an efficient method to generate a spin current by photoexcitation in a contactless and ultra-fast way. In two-dimensional (2D) collinear antiferromagnetic (AFM) materials that preserve the combined time-reversal (T) and inversion (I) symmetry (i.e., TI symmetry), we find that the photogalvanic currents in two magnetic sublattices carry different kinds of spins and propagate in opposite direction if the spin-orbit coupling is negligible, resulting in a pure spin current without net charge current. Based on the first-principles calculations, we show that two experimentally synthesized 2D collinear AFM materials, monolayer MnPS$_3$ and bilayer CrCl$_3$, host the required symmetry and support sizable SPGE. The predicted SPGE in 2D collinear AFM materials makes them promising platforms for nano spintronics devices.
Kondo screening of a high-spin Nagaoka state in a triangular quantum dot
Creators: name: Oguri, Akira
name: Nisikawa, Yunori
name: Tanaka, Yoshihide
name: Numata, Takahide
Publisher: name: arXiv
Year: 2006
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We study transport through a triangle triple quantum dot connected to two noninteracting leads using the numerical renormalization group (NRG). The triangle has a high-spin ground state of S=1 caused by a Nagaoka ferromagnetism, when it is isolated and has one extra electron introduced into a half-filling. The results show that the conduction electrons screen the local moment via two separate stages with different energy scales. The half of the S=1 is screened first by one of the channel degrees, and then at very low temperature the remaining half is fully screened to form a Kondo singlet. The transport is determined by two phase shifts for quasi-particles with even and odd parities, and then a two-terminal conductance in the series configuration is suppressed $g_{\rm series} \simeq 0$, while plateau of a four-terminal parallel conductance reaches a Unitary limit value $g_{\rm parallel} \simeq 4e^2/h$ of two conducting modes.
description: 2pages, 2figures: fig1 is revised to show a narrow dip found in the series conductance
Size Effects in Nanocrystalline Thoria
Creators: name: Plakhova, Tatiana V.
name: Romanchuk, Anna Yu.
name: Likhosherstova, Daria V.
name: Baranchikov, Alexander E.
name: Dorovatovskii, Pavel V.
name: Svetogorov, Roman D.
name: Shatalova, Tatiana B.
name: Egorova, Tolganay B.
name: Trigub, Alexander L.
name: Kvashnina, Kristina O.
name: Ivanov, Vladimir K.
name: Kalmykov, Stepan N.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences
subject: 82D80

description: The facile chemical precipitation method and subsequent thermal treatment were shown to be suitable for preparation of crystalline ThO2 nanoparticles(NPs) in a wide range of particle sizes (from 2.5 to 34.3 nm). The obtained NPs were investigated with X-ray diffraction, high-resolution transmission electron microscopy, and X-ray absorption techniques to find out the possible size effects associated with nanocrystalline thoria.
description: The Journal of Physical Chemistry C (2019)
Macroscopically Self-Aligned and Chiralized Carbon Nanotubes: From Filtration to Innovation
Creators: name: Doumani, Jacques
name: Zahn, Keshav
name: Yu, Shengjie
name: Barrios, Gustavo Rodriguez
name: Sasmal, Somesh
name: Kikuchi, Rikuta
name: Kritzell, T. Elijah
name: Xu, Hongjing
name: Baydin, Andrey
name: Kono, Junichiro
Publisher: name: arXiv
Year: 2023
Subjects: subject: Applied Physics (physics.app-ph)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Because of their natural one-dimensional (1D) structure combined with intricate chiral variations, carbon nanotubes (CNTs) exhibit various exceptional physical properties, such as ultrahigh electrical and thermal conductivity, exceptional mechanical strength, and chirality-dependent metallicity. These properties make CNTs highly promising for diverse applications, including field-effect transistors, sensors, photodetectors, and thermoelectric devices. While CNTs excel individually at the nanoscale, their 1D and chiral nature can be lost on a macroscopic scale when they are randomly assembled. Therefore, the alignment and organization of CNTs in macroscopic structures is crucial for harnessing their full potential. In this review, we explore recent advancements in understanding CNT alignment mechanisms, improving CNT aligning methods, and demonstrating macroscopically 1D properties of ordered CNT assemblies. We also focus on a newly discovered class of CNT architectures, combining CNT alignment and twisting mechanisms to create artificial radial and chiral CNT films at wafer scales. Finally, we summarize recent developments related to aligned and chiral CNT films in optoelectronics, highlighting their unique roles in solar cells, thermal emitters, and optical modulators.
General Relativistic Thermoelectric Effects in Superconductors
Creators: name: Ahmedov, B. J.
Publisher: name: arXiv
Year: 2007
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We discuss the general-relativistic contributions to occur in the electromagnetic properties of a superconductor with a heat flow. The appearance of general-relativistic contribution to the magnetic flux through a superconducting thermoelectric bimetallic circuit is shown. A response of the Josephson junctions to a heat flow is investigated in the general-relativistic framework. Some gravitothermoelectric effects which are observable in the superconducting state in the Earth's gravitational field are considered.
description: 13 pages, 2 figures
A new approach to hyperbolic inverse problems II (Global step)
Creators: name: Eskin, Gregory
Publisher: name: arXiv
Year: 2007
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics

description: We study the inverse problem for the second order self-adjoint hyperbolic equation with the boundary data given on a part of the boundary. This paper is the continuation of the author's paper [E]. In [E] we presented the crucial local step of the proof. In this paper we prove the global step. Our method is a modification of the BC-method with some new ideas. In particular, the way of the determination of the metric is new.
description: 21 pages, 2 figures
The quest for planets around subdwarfs and white dwarfs from Kepler space telescope fields: Part I. Techniques and tests of the methods
Creators: name: Krzesinski, J.
name: Blokesz, A.
name: Siwak, M.
name: Stachowski, G.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: In this study, we independently test the presence of an exoplanet around the binary KIC 9472174, which is composed of a red dwarf and a pulsating type B subdwarf. We also present the results of our search for Jupiter-mass objects orbiting near to the eclipsing binary KIC 7975824, which is composed of a white dwarf and type B subdwarf, and the pulsating white dwarf KIC 8626021. The goal is to test analytical techniques and prepare the ground for a larger search for possible substellar survivors on tight orbits around post-common envelope binaries and stars at the end of their evolution, that is, extended horizontal branch stars and white dwarfs. We, therefore, mainly focus on substellar bodies orbiting these stars within the range of the host's former red-giant or asymptotic-giant phase envelopes. Due to the methods we use, the quest is restricted to single-pulsating type B subdwarf and white dwarf stars and short-period eclipsing binaries containing a white dwarf or a subdwarf component. Results. Based on the three objects studied in this paper, we demonstrate that these methods can be used to detect giant exoplanets orbiting around pulsating white dwarf or type B subdwarf stars as well as short-period binary systems, at distances which fall within the range of the former red-giant envelope of a single star or the common envelope of a binary. Using our analysis techniques, we reject the existence of a Jupiter-mass exoplanet around the binary KIC 9472174 at the distance and orbital period previously suggested in the literature. We also found that the eclipse timing variations observed in the binary might depend on the reduction and processing of the Kepler data. The other two objects analyzed in this work do not have Jupiter mass exoplanets orbiting within 0.7 - 1.4 AU from them, or larger-mass objects on closer orbits (the given mass limits are minimum masses).
description: 8 pages