cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
SUMNJIVE BIOGRAFIJE (Jedan pristrasan osvrt na najnoviju biografiju akademika Vladimira S. Kostića)
Creators: name: Vukajlović, Rake Filip
Publisher: name: Zenodo
Year: 2023
Subjects: SANU
Srpska akademija nauka i umetnosti
Srbija
akademici
nauka

description: Esej: "SUMNJIVE BIOGRAFIJE", sa 3 (tri) priloga, posvećen je kritičkom razmatranju najnovije biografije predsednika SANU u prethodna dva četvorogodišnja mandata (2015-2023) - akademika Vladimira S. Kostića (VSK), koja se pojavila u EDICIJI posvećenoj predsednicima Akademije i njenih istočnica (Žiri 66. Međunarodnog beogradskog sajma knjiga dodelio je Nagradu za izdavački poduhvat godine Srpskoj akademiji nauka i umetnosti  za izdanje  trotomne  publikacije „Predsednici Društva srpske slovesnosti, Srpskog učenog društva, Srpske kraljevske akademije, Srpske akademije nauka i Srpske akademije nauka i umetnosti“). Pored novog dopunskog razmatranja naučnih dometa VSK-a, dat je i kratak osvrt na njegove pretke i potomke i ukazano je na neke sive/sumnjive zone u toj biografiji. Autor ovog Eseja se nada da će čitaoci, koji ga pročitaju do kraja, biti u stanju da prosude koliko su priređivači nagrađenog izdanja bili u pravu kad su tvrdili da je u knjizi: „predstavljena delatnost, naučni opus i akademsko vizionarstvo predsednika SANU“ (u singularnom slučaju VSK-a).

Osnovni tekst: SUMNJIVE BIOGRAFIJE.pdf

Prilozi uz osnovni tekst:

Prilog br.1 - Vladimir S. Kostić SCOPUS novembar 2023.pdf;

Prilog br.2 - Milutin V. Kostić SCOPUS decembar 2023.pdf;

Prilog br.3 - Vladimir S. Kostić BIOGRAFIJA 2023.pdf.
Proposal of Epidemiological Cutoff Values for Apramycin 15 μg and Florfenicol 30 μg Disks Applicable to Staphylococcus aureus
Creators: name: Costa, Sofia Santos
name: Ferreira, Carolina
name: Ribeiro, Rute
name: Fessler, Andrea T.
name: Schink, Anne-Kathrin
name: Kadlec, Kristina
name: Kaspar, Heike
name: Amaro, Ana
name: Albuquerque, Teresa
name: Schwarz, Stefan
Publisher: name: Freie Universität Berlin
Year: 2021
Subjects: subject: Staphylococcus aureus
subject: epidemiological cutoff value
subject: apramycin
subject: florfenicol
subject: 500 Naturwissenschaften und Mathematik::570 Biowissenschaften; Biologie::570 Biowissenschaften; Biologie

description: Apramycin and florfenicol are two antimicrobial agents exclusively used in veterinary medicine. Resistance determinants to these antimicrobial agents have been described in several staphylococci, yet no inhibition zone-based epidemiological cutoff (ECOFF) values are available to detect populations harboring resistance mechanisms. In this study, we propose disk diffusion inhibition zone ECOFF values of Staphylococcus aureus for apramycin and florfenicol. The susceptibility to apramycin and florfenicol was evaluated by disk diffusion of five S. aureus collections, comprising 352 isolates of animal (n = 265) and human (n = 87) origin. The aggregated distributions of inhibition zone diameters were analyzed by the normalized resistance interpretation method to obtain normalized wild-type (WT) population distributions and corresponding ECOFF values. The putative WT populations of S. aureus were characterized by an inhibition zone ≥15 mm (ECOFF = 15 mm) for apramycin and ≥21 mm for florfenicol (ECOFF = 21 mm). Five nonwild-type (NWT) isolates were detected for apramycin, all without inhibition zone and harboring the apmA gene, whereas five NWT isolates were identified for florfenicol, all carrying the fexA gene. The proposed ECOFF values for apramycin and florfenicol may be a valuable tool in future antimicrobial resistance monitoring and surveillance studies to identify S. aureus NWT populations toward these antimicrobial agents.
The Schr\" odinger picture of the Dirac quantum mechanics on spatially flat Robertson-Walker backgrounds
Creators: name: Cotaescu, Ion I.
Publisher: name: arXiv
Year: 2007
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Mathematical Physics (math-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The Schr\" odinger picture of the Dirac quantum mechanics is defined in charts with spatially flat Robertson-Walker metrics and Cartesian coordinates. The main observables of this picture are identified, including the interacting part of the Hamiltonian operator produced by the minimal coupling with the gravitational field. It is shown that in this approach new Dirac quantum modes on de Sitter spacetimes may be found analytically solving the Dirac equation.
description: 6 pages 0 figures
Single and Double Scattering Mechanisms in Ionization of Helium by Electron Vortex Projectiles
Creators: name: Harris, A. L.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: Triple differential cross sections (TDCSs) for electron vortex projectile ionization of helium into the azimuthal plane are calculated using the distorted wave Born approximation. In this collision geometry, the TDCSs at low and intermediate energies exhibit unique qualitative features that can be used to identify single and double scattering mechanisms. In general, our results predict that the ionization dynamics for vortex projectiles are similar to those of their non-vortex counterparts. However, some key differences are observed. For non-vortex projectiles, a double scattering mechanism is required to emit electrons into the azimuthal plane, and this mechanism becomes more important with increasing energy. Our results demonstrate that for vortex projectiles, emission into the azimuthal plane does not require a double scattering mechanism, although this process still significantly influences the shape of the TDCS at higher energies. At low projectile energies, non-vortex ionization proceeds primarily through single binary collisions. The same is generally true for vortex projectiles, although our results indicate that double scattering is also important, even at low energy. Vortex projectiles have an inherent uncertainty in their incident momentum, which causes a broadening of the binary peak at all energies and results in a splitting of the binary peak at higher energies. The results presented here lead to several predictions that can be experimentally tested.
Limiting fluctuations in quantum gravity to diffeomorphisms
Creators: name: Slovick, Brian
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Physics (physics.gen-ph)
subject: FOS: Physical sciences

description: Within the background field formalism of quantum gravity, I show that if the quantum fluctuations are limited to diffeomorphic gauge transformations rather than the physical degrees of freedom, as in conventional quantum field theory, all the quantum corrections vanish on shell and the effective action is equivalent to the classical action. In principle, the resulting theory is finite and unitary, and requires no renormalization. I also show that this is the unique parameterization that renders the path integral independent of the on-shell condition for the background field, a form of background independence. Thus, a connection is established between background independence and renormalizability and unitarity.
description: 6 pages, no figures
Observing the Spontaneous Breakdown of Unitarity
Creators: name: van Wezel, Jasper
Publisher: name: arXiv
Year: 2008
Subjects: subject: Quantum Physics (quant-ph)
subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: During the past decade, the experimental development of being able to create ever larger and heavier quantum superpositions has brought the discussion of the connection between microscopic quantum mechanics and macroscopic classical physics back to the forefront of physical research. Under equilibrium conditions this connection is in fact well understood in terms of the mechanism of spontaneous symmetry breaking, while the emergence of classical dynamics can be described within an ensemble averaged description in terms of decoherence. The remaining realm of individual-state quantum dynamics in the thermodynamic limit was addressed in a recent paper proposing that the unitarity of quantum mechanical time evolution in macroscopic objects may be susceptible to a spontaneous breakdown. Here we will discuss the implications of this theory of spontaneous unitarity breaking for the modern experiments involving truly macroscopic Schrodinger cat states.
description: 4 pages, no figures
Explanatory dispositionalism: What anti-Humeans should say
Creators: name: Vetter, Barbara
Publisher: name: Freie Universität Berlin
Year: 2021
Subjects: subject: Anti-Humeanism
subject: Dispositions
subject: Dispositionalism
subject: Ontology
subject: Metaphysics
subject: 100 Philosophie und Psychologie::100 Philosophie::100 Philosophie und Psychologie

description: Inspired both by our ordinary understanding of the world and by reflection on science, anti-Humeanism is a growing trend in metaphysics. Anti-Humeans reject the Lewisian doctrine of Humean supervenience that the world is "just one little thing and then another", and argue instead that dispositions, powers, or capacities provide connection and (some say) activity in nature. But how exactly are we to understand the shared commitment of this anti-Humean movement? I argue that this kind of anti-Humeanism, at its most general level, is to be understood neither as a view about ontology (the existence of certain properties) nor about fundamentality, but rather as a specific claim about what explains what.
Phase separated charge density wave phase in two species extended Bose-Hubbard model
Creators: name: Mishra, Tapan
name: Sahoo, B. K.
name: Pai, Ramesh V.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: We study the quantum phase transitions in a two component bose-mixture in a one-dimensional optical lattice. The calculations have been performed in the framework of the extended Bose-Hubbard model using the finite size density matrix renormalization group method. We obtain different phase transitions for the system for integer filling. When the inter-species on-site and the nearest neighbor interactions are larger than the intra-species on-site and also the nearest neighbor interactions, the system exhibits a phase separated charge density wave (PSCDW) order that is characterized by the two species being spatially separated and existing in the density wave phases.
Objective priors in the empirical Bayes framework
Creators: name: Klebanov, Ilja
name: Sikorski, Alexander
name: Schütte, Christof
name: Röblitz, Susanna
Publisher: name: Freie Universität Berlin
Year: 2021
Subjects: subject: nonparametric inference
subject: information
subject: invariance
subject: Jeffreys prior
subject: maximum penalized likelihood estimator
subject: reference prior
subject: 500 Naturwissenschaften und Mathematik::510 Mathematik::510 Mathematik

description: When dealing with Bayesian inference the choice of the prior often remains a debatable question. Empirical Bayes methods offer a data-driven solution to this problem by estimating the prior itself from an ensemble of data. In the nonparametric case, the maximum likelihood estimate is known to overfit the data, an issue that is commonly tackled by regularization. However, the majority of regularizations are ad hoc choices which lack invariance under reparametrization of the model and result in inconsistent estimates for equivalent models. We introduce a nonparametric, transformation-invariant estimator for the prior distribution. Being defined in terms of the missing information similar to the reference prior, it can be seen as an extension of the latter to the data-driven setting. This implies a natural interpretation as a trade-off between choosing the least informative prior and incorporating the information provided by the data, a symbiosis between the objective and empirical Bayes methodologies.
Structure of the stationary state of the asymmetric target process
Creators: name: Luck, J. M.
name: Godreche, C.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We introduce a novel migration process, the target process. This process is dual to the zero-range process (ZRP) in the sense that, while for the ZRP the rate of transfer of a particle only depends on the occupation of the departure site, it only depends on the occupation of the arrival site for the target process. More precisely, duality associates to a given ZRP a unique target process, and vice-versa. If the dynamics is symmetric, i.e., in the absence of a bias, both processes have the same stationary-state product measure. In this work we focus our interest on the situation where the latter measure exhibits a continuous condensation transition at some finite critical density $ρ_c$, irrespective of the dimensionality. The novelty comes from the case of asymmetric dynamics, where the target process has a nontrivial fluctuating stationary state, whose characteristics depend on the dimensionality. In one dimension, the system remains homogeneous at any finite density. An alternating scenario however prevails in the high-density regime: typical configurations consist of long alternating sequences of highly occupied and less occupied sites. The local density of the latter is equal to $ρ_c$ and their occupation distribution is critical. In dimension two and above, the asymmetric target process exhibits a phase transition at a threshold density $ρ_0$ much larger than $ρ_c$. The system is homogeneous at any density below $ρ_0$, whereas for higher densities it exhibits an extended condensate elongated along the direction of the mean current, on top of a critical background with density $ρ_c$.
description: 30 pages, 16 figures
Complexity of comparing monomials and two improvements of the BM-algorithm
Creators: name: Lundqvist, Samuel
Publisher: name: arXiv
Year: 2008
Subjects: subject: Commutative Algebra (math.AC)
subject: FOS: Mathematics
subject: 13P10, 92C40

description: We give a new algorithm for merging sorted lists of monomials. Together with a projection technique we obtain a new complexity bound for the BM-algorithm.
description: 21 pages
Development of microsatellite markers for Jatropha curcas L.
Creators: name: Yatavee Rattanamanee
name: Surin Peyachoknagul, Nitsri Sangduen
name: Vipa Hongtrakul
Publisher: name: Genetics Society of Thailand
Year: 2009
Subjects: microsatellite markers, Jatropha curcas L.

description: 2, 2, Thai Journal of Genetics
การกลายพันธุ์ของเกสรดอกบัวเป็นกลีบดอก
Creators: name: ณรงค์ โฉมเฉลา
name: ณ. นพชัย ชาญศิลป์
Publisher: name: Genetics Society of Thailand
Year: 2009
Subjects: การกลายพันธุ์, เกสรดอกบัว, กลีบดอก

description: 1, 2, Thai Journal of Genetics
การเปรียบเทียบการแสดงออกของยีนในดอกอ่อนตัวผู้และดอกอ่อนตัวเมียในสบู่ดำ (Jatropha curcas L.) โดยใช้เทคนิค cDNA-AFLP
Creators: name: เกศินี กำพุฒ
name: สมพิศ สามิภักดิ์
Publisher: name: Genetics Society of Thailand
Year: 2014
Subjects: สบู่ดำ, cDNA-AFLP, การสร้างดอก, ยีนที่แสดงออกต่างกัน, เครื่องหมายดีเอ็นเอ, Jatropha curcas, cDNA-AFLP, flower development, differentially expressed genes, DNA marker

description: 3, 7, Thai Journal of Genetics
Intersection homology with field coefficients: $K$-Witt spaces and $K$-Witt bordism
Creators: name: Friedman, Greg
Publisher: name: arXiv
Year: 2008
Subjects: subject: Geometric Topology (math.GT)
subject: Algebraic Topology (math.AT)
subject: FOS: Mathematics
subject: 55N33, 57Q20, 57N80

description: We construct geometric examples of pseudomanifolds that satisfy the Witt condition for intersection homology Poincare duality with respect to certain fields but not others. We also compute the bordism theory of $K$-Witt spaces for an arbitrary field $K$, extending results of Siegel for $K=Q$.
description: 26 pages; also available at http://faculty.tcu.edu/gfriedman/ - Corrected version (proof of Lemma 4.11 corrected)
6th and 8th Order Hermite Integrator for N-body Simulations
Creators: name: Nitadori, Keigo
name: Makino, Junichiro
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present sixth- and eighth-order Hermite integrators for astrophysical $N$-body simulations, which use the derivatives of accelerations up to second order ({\it snap}) and third order ({\it crackle}). These schemes do not require previous values for the corrector, and require only one previous value to construct the predictor. Thus, they are fairly easy to implemente. The additional cost of the calculation of the higher order derivatives is not very high. Even for the eighth-order scheme, the number of floating-point operations for force calculation is only about two times larger than that for traditional fourth-order Hermite scheme. The sixth order scheme is better than the traditional fourth order scheme for most cases. When the required accuracy is very high, the eighth-order one is the best. These high-order schemes have several practical advantages. For example, they allow a larger number of particles to be integrated in parallel than the fourth-order scheme does, resulting in higher execution efficiency in both general-purpose parallel computers and GRAPE systems.
description: 21 pages, 6 figures, New Astronomy accepted
Lifetime measurement of the 6792 keV state in 15O, important for the astrophysical S factor extrapolation in 14N(p,g)15O
Creators: name: Schuermann, D.
name: Kunz, R.
name: Lingner, I.
name: Rolfs, C.
name: Schuemann, F.
name: Strieder, F.
name: Trautvetter, H. -P.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: We report on a new lifetime measurement of the E_x=6792 keV state in 15O via the Doppler-shift attenuation method at the E=259 keV resonance in the reaction 14N(p,g)15O. This subthreshold state is of particular importance for the determination of the ground state astrophysical S factor of 14N(p,g)15O at stellar energies. The measurement technique has been significantly improved compared with previous work. The conclusion of a finite lifetime drawn there cannot be confirmed with the present data. In addition, the lifetime of the two states at E_x=5181 and 6172 keV have been measured with the same technique in order to verify the experimental method. We observe an attenuation factor F(tau)>0.98 for the E_x =6172 and 6792 keV states, respectively, corresponding to tau<0.77 fs. The attenuation factor for the E_x=5181 keV state results in F(tau)=0.78+/-0.02 corresponding to tau=8.4+/-1.0 fs in excellent agreement with literature.
description: 7 pages, 9 figures, accepted for publication in PRC
Extrasolar planet taxonomy: a new statistical approach
Creators: name: Marchi, Simone
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: In this paper we present the guidelines for an extrasolar planet taxonomy. The discovery of an increasing number of extrasolar planets showing a vast variety of planetary parameters, like Keplerian orbital elements and environmental parameters, like stellar masses, spectral types, metallicity etc., prompts the development of a planetary taxonomy. In this work via principal component analysis followed by hierarchical clustering analysis, we report the definition of five robust groups of planets. We also discuss the physical relevance of such analysis, which may provide a valid basis for disentangling the role of the several physical parameters involved in the processes of planet formation and subsequent evolution. For instance, we were able to divide the hot Jupiters into two main groups on the basis of their stellar masses and metallicities. Moreover, for some groups, we find strong correlations between metallicity, semi-major axis and eccentricity. The implications of these findings are discussed.
description: accepted for publication on ApJ
Segregation in noninteracting binary mixture
Creators: name: Krzyzewski, Filip
name: Zaluska-Kotur, Magdalena
Publisher: name: arXiv
Year: 2007
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: Process of stripe formation is analyzed numerically in a binary mixture. The system consists of particles of two sizes, without any direct mutual interactions. Overlapping of large particles, surrounded by a dense system of smaller particles induces indirect entropy driven interactions between large particles. Under an influence of an external driving force the system orders and stripes are formed. Mean width of stripes grows logarithmically with time, in contrast to a typical power law temporal increase observed for driven interacting lattice gas systems. We describe the mechanism responsible for this behavior and attribute the logarithmic growth to a random walk of large particles in a random potential due to the small ones.
description: 5 pages, 4 figures
Aspects of NMR imaging and in vivo spectroscopy
Creators: name: Talagala, Sardha Lalith
Publisher: name: University of British Columbia
Year: 2010

description: The work described in this thesis deals mainly with aspects related to two- and three-dimensional NMR imaging. A detailed discussion on frequency-selective excitation using amplitude modulated rf pulses in relation to slice selection in NMR imaging has been presented. This includes the analysis and implementation of the method as well as illustrative experimental results. Several radiofrequency probe designs suitable for high field NMR imaging have been experimentally evaluated and their modification and construction are also described. The comparative results obtained indicate the merits and demerits of different designs and provide necessary guidelines for selecting the most suitable design depending on the application. Practical aspects of two- and three-dimensional imaging have been discussed and NMR images of several intact systems have been presented. Experimental methods which enable slice selection in the presence of chemically shifted species and two-dimensional chemical shift resolved imaging have "been described and illustrated using phantoms. The use of three-dimensional chemical shift resolved imaging as a potential method to map the pH and temperature distribution within an object has also been demonstrated. A preliminary investigation of the application of ³¹P NMR spectroscopy to study the biochemical transformations of the rat kidney during periods of ischemia and reperfusion has been presented.
Physical and kinematical properties of the X-ray absorber in the broad absorption line quasar APM 08279+5255
Creators: name: Ramírez, J. M.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We have re-analyzed the X-ray spectra of the gravitational lensed high-redshift BAL QSO APM 08279+5255, observed with the XMM-Newton and Chandra observatories. Previous studies (Hasinger et al. 2002; Chartas et al. 2002) detected unusual, highly-ionized iron absorption features, but differed in their interpretation of these features, regarding the kinematical and ionization structure. We seek one physical model that can be successfully applied to both observations. For the first time we have performed detailed photoionization modeling on the X-ray spectrum of APM 08279+5255. The absorbing gas in APM 08279+5255 can be represented by a two-absorbers model with column densities N_H(1)~7x10^{22} cm^-2, N_H(2)~6x10^{22} cm^-2, and ionization parameters logxi(1)~1.5 and logxi(2)~3, with one of them (the high-ionization component) outflowing at v~0.18(\pm 0.01)c, carrying large amount of gas out of the system. We find that the Chandra spectrum of APM 08279+5255 requires the same Fe/O ratio overabundance (previously) indicated by the XMM-Newton observation, showing that both absorber components underwent similar chemical evolution and/or have similar origin.
description: 12 pages, 7 figures, accepted by A&A at the 13th of June, 2008
Work and heat probability distributions in out-of-equilibrium systems
Creators: name: Imparato, A.
name: Peliti, L.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We review and discuss the equations governing the distribution of work done on a system which is driven out of equilibrium by external manipulation, as well as those governing the entropy flow to a reservoir in a nonequilibrium system. We take advantage of these equations to investigate the path phase transition in a manipulated mean-field Ising model and the large-deviation function for the heat flow in the asymmetric exclusion process with periodically varying transition probabilities.
description: Contribution to Proceedings of "Work, Dissipation, and Fluctuations in Nonequilibrium Physics", Brussels, 2006
Orientation of molecular solutes in nematic liquid crystals : size and shape effects
Creators: name: Kok, Mei Yeng
Publisher: name: University of British Columbia
Year: 2010

description: An understanding of the mechanisms of orientation of solutes in anisotropic solvents is of fundamental importance in the theory of liquid crystalline systems. A systematic study of these mechanisms is presently being conducted in this and other laboratories. As part of this investigation, the orientational order of a series of C[sub 2v] solutes in the liquid crystal mixture 55 wt% 1132 (Merck ZLI 1132) and 45 wt% partially deuterated EBBA (N-(4-ethoxybenzylidene)-2,6-dideutero-4-n-butylaniline) was studied using NMR spectroscopy. This technique provides a description of the average orientation of a solute in terms of the order parameters. The results obtained indicate a good correlation between order parameters and the size and shape of the solutes. A model based on short range hard body interactions, which depend on the dimensions of the solute, was used to predict orientational ordering. Excellent agreement was obtained between observed and calculated order parameters. These results provide supportive evidence that the mechanism responsible for orientation in the 55 wt% 1132 system is short range hard body interactions. A side study was conducted on the ordering of furan and thiophene in the liquid crystalline solvents 1132 and EBBA. Temperature dependence of order parameters in 55 wt% 1132 were examined. Orientation in 1132 and EBBA and temperature dependence in 55 wt% 1132 can be explained in terms of: (i) the short range interactions dependent on the dimensions of the solute, and (ii) the interaction between the molecular quadrupole moment of the solute and the average electric field gradient which is due to the solvent.
Leptoquark on $P\to \ell^{+} ν$, FCNC and LFV
Creators: name: Benbrik, Rachid
name: Chen, Chuan-Hung
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: Motivated by the disagreement between the experimental data and lattice calculations on the decay constant of the $D_{s}$ meson, we investigate leptoquark (LQ) contributions to the purely leptonic decays of a pseudoscalar (P). We concentrate on the LQs which only couple to the second-generation quarks before the electroweak symmetry breaking and we discuss in detail how flavor symmetry breaking effects are brought into the extension of the standard model after the spontaneous symmetry breaking. We find that the hermiticity of fermion mass matrices can not only reproduce the correct Cabibbo-Kobayashi-Maskawa and Maki-Nakagawa-Sakata matrices, but also reduce the number of independent flavor mixing matrices and lead to $V^{R}_{f}=V^{L}_{f}$ with $L(R)$ denoting the chirality of the f-type fermion. Accordingly, it is found that the decays $D_{s,d}\to \ell^{+} ν$, $B^{+}\to τ^{+} ν$ and $B_c\to \ell^{+} ν$ have a strong correlation in parameters. We predict that the decay constant of the $B_c$ meson calculated by the lattice could be less than the experimental data by 23%. Intriguingly, the resultant upper limits of branching ratios for $D\to μ^{+} μ^{-}$ and $τ\to μ(π^0, η, η', ρ, ω)$ are found to be around $ 5.1\times 10^{-7}$ and $(2.6, 1.5, 0.6, 7.4, 4.8)\times 10^{-8}$, which are below and close to the current experimental upper bounds, respectively.
description: 15 pages, typos corrected, version to be published in PLB
Composite lacunary polynomials and the proof of a conjecture of Schinzel
Creators: name: Zannier, Umberto
Publisher: name: arXiv
Year: 2007
Subjects: subject: Number Theory (math.NT)
subject: FOS: Mathematics

description: Let $g(x)$ be a fixed non-constant complex polynomial. It was conjectured by Schinzel that if $g(h(x))$ has boundedly many terms, then $h(x)\in \C[x]$ must also have boundedly many terms. Solving an older conjecture raised by Rényi and by Erdös, Schinzel had proved this in the special cases $g(x)=x^d$; however that method does not extend to the general case. Here we prove the full Schinzel's conjecture (actually in sharper form) by a completely different method. Simultaneously we establish an "algorithmic" parametric description of the general decomposition $f(x)=g(h(x))$, where $f$ is a polynomial with a given number of terms and $g,h$ are arbitrary polynomials. As a corollary, this implies for instance that a polynomial with $l$ terms and given coefficients is non-trivially decomposable if and only if the degree-vector lies in the union of certain finitely many subgroups of $\Z^l$.
description: 9 pages
Additivity and Distinguishability of Random Unitary Channels
Creators: name: Rosgen, Bill
Publisher: name: arXiv
Year: 2008
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: A random unitary channel is one that is given by a convex combination of unitary channels. It is shown that the conjectures on the additivity of the minimum output entropy and the multiplicativity of the maximum output $p$-norm can be equivalently restated in terms of random unitary channels. This is done by constructing a random unitary approximation to a general quantum channel. This approximation can be constructed efficiently, and so it is also applied to the computational problem of distinguishing quantum circuits. It is shown that the problem of distinguishing random unitary circuits is as hard as the problem of distinguishing general mixed state circuits, which is complete for the class of problems that have quantum interactive proof systems.
description: 18 pages, 2 figures, typos fixed, introduction expanded
Characterising Web Site Link Structure
Creators: name: Zhou, Shi
name: Cox, Ingemar
name: Petricek, Vaclav
Publisher: name: arXiv
Year: 2007
Subjects: subject: Information Retrieval (cs.IR)
subject: FOS: Computer and information sciences
subject: H.5.4; C.2.1; D.2.8

description: The topological structures of the Internet and the Web have received considerable attention. However, there has been little research on the topological properties of individual web sites. In this paper, we consider whether web sites (as opposed to the entire Web) exhibit structural similarities. To do so, we exhaustively crawled 18 web sites as diverse as governmental departments, commercial companies and university departments in different countries. These web sites consisted of as little as a few thousand pages to millions of pages. Statistical analysis of these 18 sites revealed that the internal link structure of the web sites are significantly different when measured with first and second-order topological properties, i.e. properties based on the connectivity of an individual or a pairs of nodes. However, examination of a third-order topological property that consider the connectivity between three nodes that form a triangle, revealed a strong correspondence across web sites, suggestive of an invariant. Comparison with the Web, the AS Internet, and a citation network, showed that this third-order property is not shared across other types of networks. Nor is the property exhibited in generative network models such as that of Barabasi and Albert.
description: To appear at IEEE/WSE07
THE IMPORTANCE OF PEDAGOGICAL TECHNOLOGIES IN THE EDUCATIONAL PROCESS
Creators: name: Aminova, Mokhigul
name: Yusupova, Kamola
Publisher: name: Zenodo
Year: 2025

description: This article analyzes the importance of pedagogical technologies in the educational process. Pedagogical technologies are an important factor in increasing the effectiveness of education in the modern education system, individualizing students' learning, and improving the quality of the teaching process through interactive methods. The article discusses innovative pedagogical technologies, their main types, and their integration into the educational process. It also highlights the role of pedagogical technologies in developing the teacher's professional skills, forming independent thinking and creative thinking of students. The results of the study are aimed at revealing the effectiveness of using modern technologies in the educational process.
Trace formula for dieletric cavities : I. General properties
Creators: name: Bogomolny, E.
name: Dubertrand, R.
name: Schmit, C.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Chaotic Dynamics (nlin.CD)
subject: FOS: Physical sciences

description: The construction of the trace formula for open dielectric cavities is examined in detail. Using the Krein formula it is shown that the sum over cavity resonances can be written as a sum over classical periodic orbits for the motion inside the cavity. The contribution of each periodic orbit is the product of the two factors. The first is the same as in the standard trace formula and the second is connected with the product of reflection coefficients for all points of reflection with the cavity boundary. Two asymptotic terms of the smooth resonance counting function related with the area and the perimeter of the cavity are derived. The coefficient of the perimeter term differs from the one for closed cavities due to unusual high-energy asymptotics of the $\mathbf{S}$-matrix for the scattering on the cavity. Corrections to the leading semi-classical formula are briefly discussed. Obtained formulas agree well with numerical calculations for circular dielectric cavities.
description: 13 pages, 10 figures
The response of self-graviting protostellar discs to slow reduction in cooling timescale: the fragmentation boundary revisited
Creators: name: Clarke, C.
name: Harper-Clark, E.
name: Lodato, G.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: A number of previous studies of the fragmentation of self-gravitating protostellar discs have modeled radiative cooling with a cooling timescale (t_{cool}) parameterised as a simple multiple (beta_{cool}) of the local dynamical timescale. Such studies have delineated the `fragmentation boundary' in terms of a critical value of beta_{cool} (beta_{crit}), where the disc fragments if beta_{cool} < beta_{crit}. Such an approach however begs the question of how in reality a disc could ever be assembled with beta_{cool} < beta_{crit}. Here we adopt the more realistic approach of gradually reducing beta_{cool}, as might correspond to changes in thermal regime due to secular changes in the disc density profile. We find that when beta_{cool} is gradually reduced (on a timescale longer than t_{cool}), the disc is stabilised against fragmentation, compared with models in which beta_{cool} is reduced rapidly. We therefore conclude that a disc's ability to remain in a self-regulated, self-gravitating state (without fragmentation) is partly dependent on its thermal history, as well as its current cooling rate. Nevertheless, a slow reduction in t_{cool} appears only to lower the fragmentation boundary by about a factor two in t_{cool} and thus only permits maximum alpha values (parameterising the efficiency of angular momentum transfer in the disc) that are about a factor two higher than determined hitherto. Our results therefore do not undermine the notion of a fundamental upper limit to the heating rate that can be delivered by gravitational instabilities before the disc is subject to fragmentation. An important implication of this work, therefore, is that self-gravitating discs can enter into the regime of fragmentation via secular evolution and it is not necessary to invoke rapid (impulsive) events to trigger fragmentation.
description: accepted for publication in MNRAS
Variability of the low-level circulation of the South American Monsoon analysed with complex networks
Creators: name: Gelbrecht, Maximilian
name: Boers, Niklas
name: Kurths, Jürgen
Publisher: name: Freie Universität Berlin
Year: 2021
Subjects: subject: South American Monsoon
subject: low-level circulation
subject: variability
subject: 500 Naturwissenschaften und Mathematik::550 Geowissenschaften, Geologie::550 Geowissenschaften

description: Understanding the variability of low-level atmospheric circulation regimes is key for understanding the dynamics of monsoon systems. The South American Monsoon is characterized by strong year-long trade winds that are channeled southward into the South American Low-Level Jet after crossing the Amazon basin, which in turn is elementary for the moisture transport to Southern South America. In this study, we utilize streamflow wind networks, a type of climate networks that tracks the local flow of the wind field, together with the analysis of composites of wind, precipitation, and geopotential height fields, to investigate the variability of the South American low-level circulation. The streamflow wind networks are used here as they are able to directly track the wind flow and encode its spatiotemporal characteristics in their topology. We focus on intraseasonal variations in terms of active and break monsoon phases on the one hand, and on the interannual variability in terms of the impacts of the El Niño-Southern Oscillation on the other hand. Our findings highlight the importance of the South American Low-Level Jet, its spatial position and variability. Our study reveals the relation of the active and break regimes to anomalous high- and low-pressure systems over the southern Atlantic that are connected to Rossby wave trains from the southern Pacific, as well as the impact of these regimes on the cross-equatorial low-level flow. In addition, the streamflow networks that we use demonstrate significant shifts of the dominant wind flow pattern during El Niño and La Niña episodes.
title: CONCEPTUAL MODELS FOR DEVELOPMENTAL NEEDS OF ACADEMIC MIDDLE MANAGERS IN HIGHER EDUCATION INSTITUTIONS
Creators: name: Mughal, M
Publisher: name: Liverpool John Moores University
Year: 2021

description: Development of employees by the Human Resources (HR) department in any organization is crucial to implementing its strategy, processes and procedures for success. The same principle applies to Higher Education Institutions (HEIs) in which academic Middle Managers (MMs) are the balancing drivers who execute organization’s vision and mission and contribute towards its goals. At faculty level, academic MMs roles include Deans, Head of Departments, Subject leaders and Principal lecturers/Programme leaders. However, emergent from contemporary literature studies shows that HEIs structures and systems are rapidly changing and highly impacting academic MMs in their roles. Thus, the changes and challenges transpiring in the HEIs sector are inducing and creating colossal pressures and workloads for academic MMs to work effectively and efficiently in their respective roles. Contributing to this burden, are factors such as; an increase in student numbers and retention, bureaucracy, accountability and reporting, policies, skills, management and leadership development and practice, globalisation and international outlook, competition and league tables, resources, technological advances, quality teaching, learning and research, providing value and creating balance. Based on these notions, the research aim is to create conceptual models for developmental needs of academic MMs in HEIs via a mixed methodology implemented in three phases. The findings of this research through qualitative enquiry identified fifteen factors during semi-structured interviews, six main categories using grounded theory approach, and eight main themes in case studies. In quantitative approach, seventeen factors using univariate analysis and sixteen factors using factor analysis were identified. The originality of this study contributed to the theory, practice and research of academic MMs developmental needs by; new interpretations of the authors in the field, testing and adding to theories, synthesizing work and offering work perspectives, carrying out innovative research in UK and detailed work across methods.
alpha particle momentum distributions from 12C decaying resonances
Creators: name: Alvarez-Rodriguez, R.
name: Jensen, A. S.
name: Fedorov, D. V.
name: Fynbo, H. O. U.
name: Garrido, E.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: The computed $α$ particle momentum distributions from the decay of low-lying $^{12}$C resonances are shown. The wave function of the decaying fragments is computed by means of the complex scaled hyperspherical adiabatic expansion method. The large-distance part of the wave functions is crucial and has to be accurately calculated. We discuss energy distributions, angular distributions and Dalitz plots for the $4^+$, $1^+$ and $4^-$ states of $^{12}$C.
description: 6 pages, 4 figures. Proceedings of the SOTANCP2008 conference held in Strasbourg in May 2008
Photon Dominated Region Modeling of Barnard 68
Creators: name: Pineda, Jorge L.
name: Bensch, Frank
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We use the Barnard 68 dark globule as a test case for a spherically symmetric PDR model exposed to low-UV radiation fields. With a roughly spherical morphology and an accurately determined density profile, Barnard 68 is ideal for this purpose. The processes governing the energy balance in the cloud surface are studied in detail. We compare the spherically symmetric PDR model by Stoerzer, Stutzki & Sternberg (1996) to observations of the three lowest rotational transitions of 12CO, 13CO J = 2-1 and J = 3-2 as well as the [CI] 3P_1-3P_0 fine structure transition. We study the role of Polycyclic Aromatic Hydrocarbons (PAHs) in the chemical network of the PDR model and consider the impact of depletion as well as of a variation of the external FUV field. We find it difficult to simultaneously model the observed 12CO and 13CO emission. The 12CO and [CI] emission can be explained by a PDR model with a external FUV field of 1-0.75 chi_0, but this model fails to reproduce the observed 13CO by a factor of ~2. Adding PAHs to the chemical network increases the [CI] emission by 50% in our model but makes [CII] very faint. CO depletion only slightly reduces the 12CO and 13CO line intensity (by <10% and <20%, respectively). Predictions for the [CII] 2P_3/2-2P_1/2, [CI] 3P_2-3P_1 and 12CO J= 5-4 and 4-3 transitions are presented. This allows a test of our model with future observations (APEX, NANTEN2, HERSCHEL, SOFIA).
description: Accepted for publication to A&A. 11 pages, 7 figures, 8 tables
Bouncing Negative-Tension Branes
Creators: name: Lehners, Jean-Luc
name: Turok, Neil
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Braneworlds, understood here as double domain wall spacetimes, can be described in terms of a linear harmonic function, with kinks at the locations of the boundary branes. In a dynamical setting, there is therefore the risk that the boundary brane of negative tension, at whose location the value of the harmonic function is always lowest, can encounter a zero of this harmonic function, corresponding to the formation of a singularity. We show that for certain types of brane-bound matter this singularity can be avoided, and the negative-tension brane can shield the bulk spacetime from the singularity by bouncing back smoothly before reaching the singularity. In our analysis we compare the 5- and 4-dimensional descriptions of this phenomenon in order to determine the validity of the moduli space approximation.
description: 20 pages, 1 figure, discussion extended and references added; minor mistake corrected
Cosmic Rays and Climate
Creators: name: Kirkby, Jasper
Publisher: name: arXiv
Year: 2008
Subjects: subject: Atmospheric and Oceanic Physics (physics.ao-ph)
subject: FOS: Physical sciences

description: Among the most puzzling questions in climate change is that of solar-climate variability, which has attracted the attention of scientists for more than two centuries. Until recently, even the existence of solar-climate variability has been controversial - perhaps because the observations had largely involved temporary correlations between climate and the sunspot cycle. Over the last few years, however, diverse reconstructions of past climate change have revealed clear associations with cosmic ray variations recorded in cosmogenic isotope archives, providing persuasive evidence for solar or cosmic ray forcing of the climate. However, despite the increasing evidence of its importance, solar climate variability is likely to remain controversial until a physical mechanism is established. Although this remains a mystery, observations suggest that cloud cover may be influenced by cosmic rays, which are modulated by the solar wind and, on longer time scales, by the geomagnetic field and by the galactic environment of Earth. Two different classes of microphysical mechanisms have been proposed to connect cosmic rays with clouds: firstly, an influence of cosmic rays on the production of cloud condensation nuclei and, secondly, an influence of cosmic rays on the global electrical circuit in the atmosphere and, in turn, on ice nucleation and other cloud microphysical processes. Considerable progress on understanding ion-aerosol-cloud processes has been made in recent years, and the results are suggestive of a physically- plausible link between cosmic rays, clouds and climate. However, a concerted effort is now required to carry out definitive laboratory measurements of the fundamental physical and chemical processes involved, and to evaluate their climatic significance with dedicated field observations and modelling studies.
description: 42 pages, 19 figures
Spectral analysis of deformed random networks
Creators: name: Jalan, Sarika
Publisher: name: arXiv
Year: 2008
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Quantitative Methods (q-bio.QM)
subject: FOS: Physical sciences
subject: FOS: Biological sciences

description: We study spectral behavior of sparsely connected random networks under the random matrix framework. Sub-networks without any connection among them form a network having perfect community structure. As connections among the sub-networks are introduced, the spacing distribution shows a transition from the Poisson statistics to the Gaussian orthogonal ensemble statistics of random matrix theory. The eigenvalue density distribution shows a transition to the Wigner's semicircular behavior for a completely deformed network. The range for which spectral rigidity, measured by the Dyson-Mehta $Δ_3$ statistics, follows the Gaussian orthogonal ensemble statistics depends upon the deformation of the network from the perfect community structure. The spacing distribution is particularly useful to track very slight deformations of the network from a perfect community structure, whereas the density distribution and the $Δ_3$ statistics remain identical to the undeformed network. On the other hand the $Δ_3$ statistics is useful for the larger deformation strengths. Finally, we analyze the spectrum of a protein-protein interaction network for Helicobacter, and compare the spectral behavior with those of the model networks.
description: accepted for publication in Phys. Rev. E (replaced with the final version)