cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Scalable Quantum Networks based on Few-Qubit Registers
Creators: name: Jiang, L.
name: Taylor, J. M.
name: Sørensen, A. S.
name: Lukin, M. D.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We describe and analyze a hybrid approach to scalable quantum computation based on an optically connected network of few-qubit quantum registers. We show that probabilistically connected five-qubit quantum registers suffice for deterministic, fault-tolerant quantum computation even when state preparation, measurement, and entanglement generation all have substantial errors. We discuss requirements for achieving fault-tolerant operation for two specific implementations of our approach.
description: 4 pages, 3 figures (new figures 1 and 3)
Spectrum of soft mode with thermal mass of quarks above critical temperature
Creators: name: Hidaka, Yoshimasa
name: Kitazawa, Masakiyo
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We study effects of a thermal-quark mass and Landau damping of quarks on the chiral phase transition and its soft modes at finite temperature. For this purpose we employ a simple model with the quark propagator obtained in the hard thermal loop approximation. We show that the chiral phase transition is second order even if quark have a finite thermal mass, and the thermal mass suppresses the chiral condensate. We argue that mesonic spectra have a large width due to scattering between gluons and quarks, and the van Hove singularity at threshold.
description: 6 pages, 5 figures, contribution to the proceedings of the 19th International Conference on Ultra-Relativistic Nucleus-Nucleus Collisions (QM2006), November 14-20 2006, Shanghai, China
Minimal excitation states of electrons in one-dimensional wires
Creators: name: Keeling, J.
name: Klich, I.
name: Levitov, L. S.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: A strategy is proposed to excite particles from a Fermi sea in a noise-free fashion by electromagnetic pulses with realistic parameters. We show that by using quantized pulses of simple form one can suppress the particle-hole pairs which are created by a generic excitation. The resulting many-body states are characterized by one or several particles excited above the Fermi surface accompanied by no disturbance below it. These excitations carry charge which is integer for noninteracting electron gas and fractional for Luttinger liquid. The operator algebra describing these excitations is derived, and a method of their detection which relies on noise measurement is proposed.
description: 4 pages, 2 figures
Supplementary document for Modulating afterglow time of Mn2+ doped double perovskites by size tuning and its applications in dynamic information display - 6306062.pdf
Creators: name: wang, peng
name: Wang, Ying
name: Guan, Wei
name: Dong, Hongzhou
name: Sui, Lina
name: Gan, Zhixing
name: Dong, Lifeng
name: Yu, Liyan
Publisher: name: Optica Publishing Group
Year: 2023
Subjects: Uncategorized

description: PDF document with expanded results
An iterative procedure for general probability measures to obtain I-projections onto intersections of convex sets
Creators: name: Bhattacharya, Bhaskar
Publisher: name: arXiv
Year: 2006
Subjects: subject: Statistics Theory (math.ST)
subject: FOS: Mathematics
subject: 62B10, 60B10, 65K10 (Primary) 60E15 (Secondary)

description: The iterative proportional fitting procedure (IPFP) was introduced formally by Deming and Stephan in 1940. For bivariate densities, this procedure has been investigated by Kullback and Rüschendorf. It is well known that the IPFP is a sequence of successive I-projections onto sets of probability measures with fixed marginals. However, when finding the I-projection onto the intersection of arbitrary closed, convex sets (e.g., marginal stochastic orders), a sequence of successive I-projections onto these sets may not lead to the actual solution. Addressing this situation, we present a new iterative I-projection algorithm. Under reasonable assumptions and using tools from Fenchel duality, convergence of this algorithm to the true solution is shown. The cases of infinite dimensional IPFP and marginal stochastic orders are worked out in this context.
description: Published at http://dx.doi.org/10.1214/009053606000000056 in the Annals of Statistics (http://www.imstat.org/aos/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Realistic two-nucleon potentials for the relativistic two-nucleon Schroedinger equation
Creators: name: Kamada, H.
name: Gloeckle, W.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: The potentials $V (v)$ in the nonrelativistic (relativistic) nucleon-nucleon (NN) Schroedingerequation are related by a quadratic equation. That equation is numerically solved, thus providing phase equivalent v- potentials related for instance to the high precision NN potentials, which are adjusted to NN phase shift and mixing parameters in a nonrelativistic Schroedinger equation. The relativistic NN potentials embedded in a three-nucleon (3N)system for total NN momenta different from zero are also constructed in a numerically precise manner. They enter into the relativistic interacting 3N mass operator, which is needed for relativistic 3N calculations for bound and scattering states.
description: 6 pages, 4figures, 2 tables; typos added
Anisotropic Electron-Phonon Coupling and Dynamical Nesting on the Graphene Sheets in CaC6
Creators: name: Valla, T.
name: Camacho, J.
name: Pan, Z-H.
name: Fedorov, A. V.
name: Walters, A. C.
name: Howard, C. A.
name: Ellerby, M.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Superconductivity in graphite intercalated compounds has been studied for more than 40 years and it is still not fully understood, despite the recent progress and the discovery of relatively high Tc superconductivity in CaC6 and YbC6. Recent studies now suggest that the electron-phonon coupling is most likely responsible for pairing and that the intercalant-derived electronic states and vibrations play the dominant role. Here, we present the first studies of electronic structure in CaC6, a superconductor with Tc=11.6 K. Using angle-resolved photoemission spectroscopy, we find that, contrary to theoretical models, the EPC on the graphene-derived Fermi sheets is surprisingly strong, reflecting the interaction with high-frequency graphene-derived vibrations. Thus, in addition to the amazing properties in the charge-neutral state, graphene sheets also show surprises in the heavily doped regime: they may support strong pairing interactions and lead to superconductivity in compounds in which they are building blocks.
description: 11 pages, 3 figures
Probing Dynamical Dark Energy with Press-Schechter Mass Functions
Creators: name: Delliou, Morgan Le
Publisher: name: arXiv
Year: 2007
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Astrophysics (astro-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Measurement of accelerated expansion in the Universe led to propose a new cosmic fluid as its cause: dark energy. Its various incarnations offer a wealth of models whose relevance it is important to discriminate via contacts with observations. I will present my investigations on the influence of dynamical dark energy models on the formation of non-linear dark matter structures. In particular, I will focus on structures traced by the mass function of dark matter haloes.
description: submitted to the Proceedings of the 11th Marcel Grossmann Meeting, MG11, Berlin, Germany, July 23-29, 2006 (2007) to be published
Preon Model and Family Replicated E_6 Unification
Creators: name: Das, Chitta Ranjan
name: Laperashvili, Larisa V.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Previously we suggested a new preon model of composite quark-leptons and bosons with the 'flipped' $E_6\times \widetilde{E_6}$ gauge symmetry group. We assumed that preons are dyons having both hyper-electric $g$ and hyper-magnetic $\tilde g$ charges, and these preons-dyons are confined by hyper-magnetic strings which are an ${\bf N}=1$ supersymmetric non-Abelian flux tubes created by the condensation of spreons near the Planck scale. In the present paper we show that the existence of the three types of strings with tensions $T_k=k T_0$ $(k = 1,2,3)$ producing three (and only three) generations of composite quark-leptons, also provides three generations of composite gauge bosons ('hyper-gluons') and, as a consequence, predicts the family replicated $[E_6]^3$ unification at the scale $\sim 10^{17}$ GeV. This group of unification has the possibility of breaking to the group of symmetry: $ [SU(3)_C]^3\times [SU(2)_L]^3\times [U(1)_Y]^3 \times [U(1)_{(B-L)}]^3$ which undergoes the breakdown to the Standard Model at lower energies. Some predictive advantages of the family replicated gauge groups of symmetry are briefly discussed.
description: This is a contribution to the Proc. of the Seventh International Conference ''Symmetry in Nonlinear Mathematical Physics'' (June 24-30, 2007, Kyiv, Ukraine), published in SIGMA (Symmetry, Integrability and Geometry: Methods and Applications) at http://www.emis.de/journals/SIGMA/
Sulphur abundances in disk stars as determined from the forbidden 10821 A [SI] line
Creators: name: Ryde, Nils
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Aims: In this paper we aim to study the chemical evolution of sulphur in the galactic disk, using a new optimal abundance indicator: the [SI] line at 10821 A. Similar to the optimal oxygen indicators, the [OI] lines, the [SI] line has the virtues of being less sensitive to the assumed temperatures of the stars investigated and of likely being less prone to non-LTE effects than other tracers. Methods: High-resolution, near-infrared spectra of the [SI] line are recorded using the Phoenix spectrometer on the Gemini South telescope. The analysis is based on 1D, LTE model atmospheres using a homogeneous set of stellar parameters. Results: The 10821 A [SI] line is suitable for an abundance analysis of disk stars, and the sulphur abundances derived from it are consistent with abundances derived from other tracers. We corroborate that, for disk stars, the trend of sulphur-to-iron ratios with metallicity is similar to that found for other alpha elements, supporting the idea of a common nucleosynthetic origin.
description: Accepted for publication in A&A Letters
Wormhole and C-field: Revisited
Creators: name: Rahaman, F.
name: Sarker, M.
name: Kalam, M.
Publisher: name: arXiv
Year: 2007
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Recently, Rahaman et al [ Nuovo.Cim 119B, 1115(2004)] have shown that the static spherically symmetric solutions in presence of C-field give rise to wormhole geometry. We highlight some of the characteristics of this wormhole, which have not been considered in the previous study.
description: 10 pages and 5 figures, Submitted to Nuovo Cimento B after minor revisions
Brown-Rho Scaling in the Strong Coupling Lattice QCD
Creators: name: Ohnishi, A.
name: Kawamoto, N.
name: Miura, K.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We examine the Brown-Rho scaling for meson masses in the strong coupling limit of lattice QCD with one species of staggered fermion. Analytical expression of meson masses is derived at finite temperature and chemical potential. We find that meson masses are approximately proportional to the equilibrium value of the chiral condensate, which evolves as a function of temperature and chemical potential.
description: Prepared for Chiral Symmetry in Hadron and Nuclear Physics (Chiral07), Nov. 13-16, 2007, Osaka, Japan
Stationary distributions of a model of sympatric speciation
Creators: name: Yu, Feng
Publisher: name: arXiv
Year: 2007
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics
subject: 92D15 (Primary) 60J25, 60J27, 92D25 (Secondary)

description: This paper deals with a model of sympatric speciation, that is, speciation in the absence of geographical separation, originally proposed by U. Dieckmann and M. Doebeli in 1999. We modify their original model to obtain a Fleming--Viot type model and study its stationary distribution. We show that speciation may occur, that is, the stationary distribution puts most of the mass on a configuration that does not concentrate on the phenotype with maximum carrying capacity, if competition between phenotypes is intense enough. Conversely, if competition between phenotypes is not intense, then speciation will not occur and most of the population will have the phenotype with the highest carrying capacity. The length of time it takes speciation to occur also has a delicate dependence on the mutation parameter, and the exact shape of the carrying capacity function and the competition kernel.
description: Published at http://dx.doi.org/10.1214/105051606000000916 in the Annals of Applied Probability (http://www.imstat.org/aap/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Probing space-time structure of new physics with polarized beams at the ILC
Creators: name: Ananthanarayan, B.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: At the International Linear Collider large beam polarization of both the electron and positron beams will enhance the signature of physics due to interactions that are beyond the Standard Model. Here we review our recently obtained results on a general model independent method of determining for an arbitary one-particle inclusive state the space-time structure of such new physics through the beam polarization dependence and angular distribution of the final state particle.
description: 6 pages, plain latex, Talk given at LCWS06, Linear Collider Workshop, 9-13 March 2006, Bangalore, India
Early-type galaxies with neutral hydrogen in the Virgo cluster from the ALFALFA survey
Creators: name: Alighieri, S. di Serego
name: Grossi, M.
name: Giovanardi, C.
name: Pellegrini, S.
name: Trinchieri, G.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We extend our published work on the neutral hydrogen content of early-type galaxies in the Virgo cluster using the catalogue of detected sources from the ALFALFA survey, by showing the 21cm spectra of all the detected galaxies and discussing a deeper analysis of the ALFALFA datacubes, searching for lower S/N sources. A view of the multiphase interstellar medium of M86 is also presented, by comparing images of the cold, warm and hot phases.
description: To appear in the Proceedings of the Conference "The Evolution of Galaxies through the Neutral Hydrogen Window", R. Minchin & E. Momjian eds
RESEARCH ON CRO'S DILEMMA IN SAPIENS CHAIN: A GAME THEORY METHOD
Creators: name: Shi, Jinyu
name: Wang, Zhongru
name: Ruan, Qiang
name: Wu, Yue
name: Fang, Binxing
Publisher: name: figshare
Year: 2018
Subjects: classificationCode: 460308
subject: Pattern recognition
classificationCode: 460502
subject: Data mining and knowledge discovery

description: In recent years, blockchain-based techniques have been widely used in cybersecurity, owing to the decentralization, anonymity, credibility and not be tampered properties of the blockchain. As one of the decentralized framework, Sapiens Chain was proposed to protect cybersecurity by scheduling the computational resources dynamically, which were owned by Computational Resources Owners (CROs). However, when CROs in the same pool attack each other, all CROs will earn less. In this paper, we tackle the problem of prisoner’s dilemma from the perspective of CROs. We first define a game that a CRO infiltrates another pool and perform an attack. In such game, the honest CRO can control the payoffs and increase its revenue. By simulating this game, we propose to apply Zero Determinant (ZD) strategy on strategy decision, which can be categorized into cooperation and defecting. Our experimental results demonstrate the effectiveness of the proposed strategy decision method.
Binary Labelings for Plane Quadrangulations and their Relatives
Creators: name: Felsner, Stefan
name: Huemer, Clemens
name: Kappes, Sarah
name: Orden, David
Publisher: name: arXiv
Year: 2006
Subjects: subject: Combinatorics (math.CO)
subject: FOS: Mathematics
subject: 05C78

description: Motivated by the bijection between Schnyder labelings of a plane triangulation and partitions of its inner edges into three trees, we look for binary labelings for quadrangulations (whose edges can be partitioned into two trees). Our labeling resembles many of the properties of Schnyder's one for triangulations: Apart from being in bijection with tree decompositions, paths in these trees allow to define the regions of a vertex such that counting faces in them yields an algorithm for embedding the quadrangulation, in this case on a~2-book. Furthermore, as Schnyder labelings have been extended to 3-connected plane graphs, we are able to extend our labeling from quadrangulations to a larger class of 2-connected bipartite graphs. Finally, we propose a binary labeling for Laman graphs.
description: 27 pages, 25 figures. New introduction and abstract. Structure clarified. Added new results
Exact Solutions and the Attractor Mechanism in Non-BPS Black Holes
Creators: name: Hotta, Kyosuke
name: Kubota, Takahiro
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The attractor mechanism for the four-dimensional ${\cal N}=2$ supergravity black hole solution is analyzed in the case of the D0-D4 system. Our analyses are based on newly derived exact solutions, which exhibit explicitly the attractor mechanism for extremal non-BPS black holes. Our solutions account for the moduli as general complex fields, while in almost all non-BPS solutions obtained previously, the moduli fields are restricted to be purely imaginary. It is also pointed out that our moduli solutions contain an extra parameter that is not contained in solutions obtained by replacing the charges in the double extremal moduli solutions by the corresponding harmonic functions.
description: 16 pages, added a few references
The effects of hydroxyflutamide on action and production of androgens in rats induced to superovulate
Creators: name: Yu, Frank Hong
Publisher: name: University of British Columbia
Year: 2010

description: In two experiments, immature female Sprague-Dawley rats treated with superovulatory doses of pregnant mare serum gonadotropin (PMSG) were used to study the effects of antiandrogen, hydroxyflutamide, on steroid production, particularly the biologically active androgens, testosterone, 5α-dihydrotestosterone, and androstenedione. In the first experiment, the animals were given either 5 mg hydroxyflutamide or vehicle alone at 30 and 36 h following 40 IU PMSG. Compared to the vehicle group, hydroxyflutamide treatment significantly reduced the percentage of degenerate oocytes recovered from oviducts (p<0.05). Serum levels of aromatizable androgens, testosterone and androstenedione, and their aromatized product, estradiol-17ß significantly decreased (p<0.05) in hydroxyflutamide-treated group; however, the serum concentrations of nonaromatizable androgen, 5α-dihydrotestosterone, was not statistically different between the two groups. In the second experiment, ovaries stimulated with 4 or 40 IU PMSG were obtained 48 h later and cultured in the presence and absence of hydroxyflutamide (10⁻⁵M) and/or testosterone (10⁻⁷ M) to study [4⁻¹⁴C] pregnenolone metabolism to major steroids. In 40 IU stimulated ovaries, hydroxyflutamide significantly decreased the metabolism of pregnenolone to progesterone (p<0.01) and androstenedione (p<0.01) while the production of estradiol-17ß increased significantly (p<0.05); however, pregnenolone conversions to testosterone and 5α-dihydrotestosterone were not statistically different between the untreated and hydroxyflutamide-treated cultures. Testosterone completely reversed the hydroxyflutamide-induced alteration of pregnenolone metabolism. In contrast, there was no difference in the pregnenolone conversion patterns between the untreated and hydroxyflutamide or hydroxyflutamide plus testosterone groups in the culture of ovaries stimulated with 4 IU PMSG. Present results confirm previous reports that antiandrogen, hydroxyflutamide, decreases the percentage of abnormal oocytes recovered from superovulating rats, and indicates that this hydroxyflutamide effect may be partly mediated by altered ovarian steroidogenesis, specifically the reduced hypersecretion of aromatizable androgens, testosterone and androstenedione, and/or estradiol-17ß.
Single Transverse Spin Asymmetry for Large-p_T Pion Production in Semi-Inclusive Deep Inelastic Scattering
Creators: name: Eguchi, Hisato
name: Koike, Yuji
name: Tanaka, Kazuhiro
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We study the single spin asymmetry (SSA) for the pion production with large transverse momentum p_T in semi-inclusive deep inelastic scattering $ep^\uparrow\to eπX$. We derive the twist-3 cross section formula for SSA, focussing on the soft-gluon-pole contributions associated with the twist-3 distribution for the nucleon and with the twist-3 fragmentation function for the pion. We present a simple estimate of the asymmetries due to each twist-3 effect from nucleon and pion, respectively, by fixing the overall strength of the relevant nonperturbative quantities by the data on the SSA A_N in $p^\uparrow p\toπX$ collision.
description: 19 pages in LaTex. Some discussions added. To appear in Nucl. Phys. B
Test of the Universal Rise of Hadronic Total Cross Sections at Super-high Energies
Creators: name: Ishida, Muneyuki
name: Igi, Keiji
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Saturation of the Froissart-Martin unitarity bound that the total cross sections increase like log2(s/s_0) appears to be confirmed. Due to this statement, the B log2(s/s_0) was assumed to extend the universal rise of all the total hadronic cross sections to reduce the number of adjustable parameters by the COMPETE Collaboration in the Particle Data Group (2006). Based on this assumption of parametrization, we test if the assumption on the universality of $B$ is justified through investigations of the value of B for pi p(K p)$ and pbar p, pp scatterings. We search for the simultaneous best fit to sigma(tot) and rho ratios, using a constraint from the FESR of the P' type for pi p scatterings and constraints which are free from unphysical regions for pbar p,pp and K p scatterings. By including rich informations of the low-energy scattering data owing to the use of FESR, the errors of B parameters decreases especially for pi p. The resulting value of B(pp) is consistent with B(pi p) within two standard deviation, which appears to support the universality hypothesis.
description: 5 pages, 1 figure
Magnetic excitation in a new spin gap compound Cu$_2$Sc$_2$Ge$_4$O$_{13}$: Comparison to Cu$_2$Fe$_2$Ge$_4$O$_{13}$
Creators: name: Masuda, T.
name: Redhammer, G. J.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: The compound \CuScGeO is presented as a new member of the family of weakly coupled spin chain and dimer compounds \CuMGeO. Magnetic susceptibility, heat capacity, and neutron inelastic scattering measurements reveal that the compound has the same spin dimer component as \CuFeGeO. The observed narrow band excitation in bulk measurements is consistent with spin gap behavior. The energy scale of the weakly coupled dimers in the Sc compound is perfectly coincident with that in the Fe compound.
description: 5 pages
Conjecture of Tits type for complex varieties and Theorem of Lie-Kolchin type for a cone
Creators: name: Keum, JongHae
name: Oguiso, Keiji
name: Zhang, De-Qi
Publisher: name: arXiv
Year: 2007
Subjects: subject: Algebraic Geometry (math.AG)
subject: Complex Variables (math.CV)
subject: FOS: Mathematics
subject: 14J50, 14E07, 32H50

description: First, we shall formulate and prove Theorem of Lie-Kolchin type for a cone and derive some algebro-geometric consequences. Next, inspired by a recent result of Dinh and Sibony we pose a conjecture of Tits type for a group of automorphisms of a complex variety and verify its weaker version. Finally, applying Theorem of Lie-Kolchin type for a cone, we shall confirm the conjecture of Tits type for complex tori, hyperkähler manifolds, surfaces, and minimal threefolds.
description: 16 pages
Evidence for the Discrete Asymptotically-Free BFKL Pomeron from HERA Data
Creators: name: Ellis, J.
name: Kowalski, H.
name: Ross, D. A.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We show that the next-to-leading-order renormalization-group-improved asymptotically-free BFKL Pomeron provides a good fit to HERA data on virtual photoproduction at small x and large Q^2. The leading discrete Pomeron pole reproduces qualitatively the Q^2 dependence of the HERA data for x ~10^{-3}, and a fit using the three leading discrete singularities reproduces quantitatively the Q^2 and x dependence of the HERA data for x < 10^{-2}. This fit fixes the phase for all the BFKL wavefunctions at a chosen infrared scale.
description: 12 pages, 4 figures
Mechanical properties of Pt monatomic chains
Creators: name: Shiota, T.
name: Mares, A. I.
name: Valkering, A. M. C.
name: Oosterkamp, T. H.
name: van Ruitenbeek, J. M.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: The mechanical properties of platinum monatomic chains were investigated by simultaneous measurement of an effective stiffness and the conductance using our newly developed mechanically controllable break junction (MCBJ) technique with a tuning fork as a force sensor. When stretching a monatomic contact (two-atom chain), the stiffness and conductance increases at the early stage of stretching and then decreases just before breaking, which is attributed to a transition of the chain configuration and bond weakening. A statistical analysis was made to investigate the mechanical properties of monatomic chains. The average stiffness shows minima at the peak positions of the length-histogram. From this result we conclude that the peaks in the length-histogram are a measure of the number of atoms in the chains, and that the chains break from a strained state. Additionally, we find that the smaller the initial stiffness of the chain is, the longer the chain becomes. This shows that softer chains can be stretched longer.
description: 6 pages, 5 figures
Limit order placement as an utility maximization problem and the origin of power law distribution of limit order prices
Creators: name: Lillo, Fabrizio
Publisher: name: arXiv
Year: 2006
Subjects: subject: Physics and Society (physics.soc-ph)
subject: Trading and Market Microstructure (q-fin.TR)
subject: FOS: Physical sciences
subject: FOS: Economics and business

description: I consider the problem of the optimal limit order price of a financial asset in the framework of the maximization of the utility function of the investor. The analytical solution of the problem gives insight on the origin of the recently empirically observed power law distribution of limit order prices. In the framework of the model, the most likely proximate cause of this power law is a power law heterogeneity of traders' investment time horizons .
description: 7 pages, 2 figures
Galaxy luminosity function per morphological type up to z=1.2
Creators: name: Ilbert, O.
name: Lauger, S.
name: Tresse, L.
name: Buat, V.
name: Arnout, S.
name: Fevre, O. Le
name: Burgarella, D.
name: Zucca, E.
name: Bardelli, S.
name: Zamorani, G.
name: Bottini, D.
name: Garilli, B.
name: Brun, V. Le
name: Maccagni, D.
name: Picat, J. -P.
name: Scaramella, R.
name: Scodeggio, M.
name: Vettolani, G.
name: Zanichelli, A.
name: Adami, C.
name: Arnaboldi, M.
name: Bolzonella, M.
name: Cappi, A.
name: Charlot, S.
name: Contini, T.
name: Foucaud, S.
name: Franzetti, P.
name: Gavignaud, I.
name: Guzzo, L.
name: Iovino, A.
name: McCracken, H. J.
name: Marano, B.
name: Marinoni, C.
name: Mathez, G.
name: Mazure, A.
name: Meneux, B.
name: Merighi, R.
name: Paltani, S.
name: Pello, R.
name: Pollo, A.
name: Pozzetti, L.
name: Radovich, M.
name: Bondi, M.
name: Bongiorno, A.
name: Busarello, G.
name: Ciliegi, P.
name: Mellier, Y.
name: Merluzzi, P.
name: Ripepi, V.
name: Rizzo, D.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We have computed the evolution of the rest-frame B-band luminosity function (LF) for bulge and disk-dominated galaxies since z=1.2. We use a sample of 605 spectroscopic redshifts with I_{AB}<24 in the Chandra Deep Field South from the VIMOS-VLT Deep Survey, 3555 galaxies with photometric redshifts from the COMBO-17 multi-color data, coupled with multi-color HST/ACS images from the Great Observatories Origin Deep Survey. We split the sample in bulge- and disk-dominated populations on the basis of asymmetry and concentration parameters measured in the rest-frame B-band. We find that at z=0.4-0.8, the LF slope is significantly steeper for the disk-dominated population (α=-1.19 \pm 0.07) compared to the bulge-dominated population (α=-0.53 \pm 0.13). The LF of the bulge-dominated population is composed of two distinct populations separated in rest-frame color: 68% of red (B-I)_{AB}>0.9 and bright galaxies showing a strongly decreasing LF slope α=+0.55 \pm 0.21, and 32% of blue (B-I)_{AB}<0.9 and more compact galaxies which populate the LF faint-end. We observe that red bulge-dominated galaxies are already well in place at z~1, but the volume density of this population is increasing by a factor 2.7 between z~1 and z~0.6. It may be related to the building-up of massive elliptical galaxies in the hierarchical scenario. In addition, we observe that the blue bulge-dominated population is dimming by 0.7 magnitude between z~1 and z~0.6. Galaxies in this faint and more compact population could possibly be the progenitors of the local dwarf spheroidal galaxies.
description: 9 pages, 4 figures, 2 tables, accepted for publication in Astronomy and Astrophysics
Modular networks emerge from multiconstraint optimization
Creators: name: Pan, Raj Kumar
name: Sinha, Sitabhra
Publisher: name: arXiv
Year: 2007
Subjects: subject: Physics and Society (physics.soc-ph)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: Modular structure is ubiquitous among complex networks. We note that most such systems are subject to multiple structural and functional constraints, e.g., minimizing the average path length and the total number of links, while maximizing robustness against perturbations in node activity. We show that the optimal networks satisfying these three constraints are characterized by the existence of multiple subnetworks (modules) sparsely connected to each other. In addition, these modules have distinct hubs, resulting in an overall heterogeneous degree distribution.
description: 5 pages, 4 figures; Published version
The survival and physiology of rainbow trout (oncorhynchus mykiss) in alkaline hard water
Creators: name: Yesaki, Timothy Yoji
Publisher: name: University of British Columbia
Year: 2010

description: The survival and physiology of rainbow trout in alkaline waters was the focus of this thesis. It is known that salmonids have problems with ammonia excretion in alkaline water (Cameron and Heisler, 1983; Wright and Wood, 1985). The first set of studies attempted to increase the survival rates of rainbow trout planted into alkaline lakes by acclimating them to the alkaline conditions before their release. The first field study acclimated rainbow trout to alkaline waters by acidifying the lake water with C0₂ in order to reduce the magnitude of the pH change experienced by the fish. The second field study acclimated rainbow trout to alkaline waters by increasing the alkalinity of the hatchery water in which the fish were held, over a six day period. In both studies the acclimated fish experienced higher survival rates relative to non-acclimated fish. Plasma sodium concentrations ([Na⁺]p1) of the fish were shown to increase, while plasma chloride concentrations decreased. These changes were attributed to an increase in the exchange of external Na⁺ with endogenous H⁺, and the decrease in the exchange of endogenous HC0₃⁻ with external Cl⁻, respectively. The increased [Na⁺]pl may have also been the result of the exchange of plasma ammonium (NH₄⁺) with external Na⁺. The second set of studies investigated the physiological response of rainbow trout to alkaline waters. The first study, the chronic exposure of rainbow trout to alkaline water, showed that trout in hard alkaline water experienced higher survival rates and regulated plasma ammonia and ion concentrations more competently than trout in soft alkaline water. This increased ability to regulate plasma ammonia and ion concentrations was attributed to the possible "reactivation" of the Na⁺/NH₄⁺ exchange. The purpose of the second study, the acute exposure of rainbow trout to alkaline water, was to further investigate the mechanisms that enable fish in hard alkaline water to survive better than fish in soft alkaline water. The possible activity of the Na⁺/NH₄⁺ exchange was again observed in the hard alkaline water. The addition of amiloride to the alkaline hard treatment water increased plasma total ammonia and stabilized [Na⁺]pl′, which supported the "reactivation" of the Na⁺/NH₄⁺ exchange in hard alkaline water. As a result of these studies, the acclimation of rainbow trout to hard alkaline water before being planted into any alkaline body of water was recommended.
Additional file 1 of An integrative U method for joint analysis of multi-level omic data
Creators: name: Geng, Pei
name: Tong, Xiaoran
name: Lu, Qing
Publisher: name: figshare
Year: 2019
Subjects: subject: Sociology
subject: FOS: Sociology
subject: Biological Sciences not elsewhere classified
subject: Mathematical Sciences not elsewhere classified
subject: Developmental Biology
subject: Science Policy

description: The proof of Theorem 2.1 can be found in the Appendix. (PDF 94 kb)
Perspetivas sobre o sector de arrendamento privado em Lisboa, 2011-2021
Creators: name: Alves, Sónia
name: Azevedo, Alda
name: Ferreira, Pedro
Publisher: name: Apollo - University of Cambridge Repository
Year: 2020

description: 1. Retrato do arrendamento e perfil dos arrendatários em Lisboa. 2. Alterações recentes com impacto na configuração do arrendamento privado. 3. O que podemos esperar conhecer nos resultados dos Censos 2021?
Photometric monitoring of the blazar 3C 345 for the period 1996 - 2006
Creators: name: Mihov, B.
name: Bachev, R.
name: Slavcheva-Mihova, L.
name: Strigachev, A.
name: Semkov, E.
name: Petrov, G.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present the results of the blazar 3C 345 monitoring in Johnson-Cousins BVRI bands for the period 1996 - 2006. We have collected 29 V and 43 R data points for this period; the BI light curves contain a few measurements only. The accuracy of our photometry is not better than 0.03 mag in the VR bands. The total amplitude of the variability obtained from our data is 2.06 mag in the V band and 2.25 mag in the R one. 3C 345 showed periods of flaring activity during 1998/99 and 2001: a maximum of the blazar brightness was detected in 2001 February - 15.345 mag in the V band and 14.944 mag in the R one. We confirm that during brighter stages 3C 345 becomes redder; for higher fluxes the colour index seems to be less dependent on the magnitude. The intra-night monitoring of 3C 345 in three consecutive nights in 2001 August revealed no significant intra-night variability; 3C 345 did not show evident flux changes over timescales of weeks around the period of the intra-night monitoring. This result supports the existing facts that intra-night variability is correlated with rapid flux changes rather than with specific flux levels.
Edith Wharton and queer history at the fin de siècle
Creators: name: Girling, Anna Elizabeth
Publisher: name: The University of Edinburgh
Year: 2022
Subjects: Edith Wharton
American realism
naturalism
fin-de-siècle
European literary decadence
male homosexual literary tradition
queer histories
queer history

description: What does it mean to think of Edith Wharton (1862-1937) as a decadent writer? In this thesis I suggest that, from the very beginning of her career, Wharton was a writer far more engaged with European literary decadence than has previously been recognised. In turn, I argue, this under-acknowledged engagement with literary decadence has - combined with the way that certain biographical details have shaped readings of her work - resulted in a tendency to overlook the extent to which Wharton's fiction was in dialogue with a male homosexual literary tradition that goes beyond her well-documented friendship with Henry James. Alongside Wharton's interest in fin-de-siecle Literature, and in writers such as Walter Pater, John Addington Symonds, and Oscar Wilde, I look at the ways in which she draws on and uses various 'queer' histories, including those of: the alchemist Nicolas Flamel; Napoleon and Josephine; the Oxford Movement; Margaret Fuller; the Italian Risorgimento; and Wilde's trials, and death. Approaching Wharton as an author significantly influenced by literary decadence, and these queer histories, reveals a writer concerned with many of the same questions, anxieties, and concerns more usually linked (as in recent scholarship on decadent literature) to queer, decadent, and European fin-de-siecle writers - such as contemporary understandings of sexuality and gender identity (and the impact on both men and women of the homophobia associated with emerging sexual identities), the establishment and survival of non-heteronormative relationships (including friendships), and the place of friendship in theorisations of both literary production and early-twentieth-century supranational and non-familial community building. Recognising these contexts for Wharton's writing both demonstrates the striking fin-de-siecle and 'queer' resonances of a number of her lesser-known early works and allows for new readings of some of her best-known texts. I focus in particular· on a series of Wharton's less familiar short texts, before going on to consider The Age of Innocence (1920), demonstrating the ways that an in-depth attention to her early engagement with decadence can transform how we approach her major novels. Furthermore, where Wharton's politics have either been dismissed as fundamentally conservative or sometimes awkwardly figured as progressively proto-feminist, the picture which emerges from a reading of her fiction in the context of both literary decadence and late-nineteenth-century theorisations of male homosexuality is that of a writer who, like James, Pater, Symonds, and Wilde, was engaged in a serious consideration of sexual identity and gender roles, and the relation between these, citizenship, and community.
Hexa (ɧ): The Currency of Conscious Time in the XChronos Model
Creators: name: Silva, Jaconaazar
Publisher: name: Zenodo
Year: 2025
Subjects: XChronos
symbolic currency
subjective time
ontological idealism
post-material economics
phenomenology
consciousness

description: Meta Description (Zenodo):This paper introduces Hexa (ɧ), a symbolic digital currency rooted in the XChronos model—a framework of subjective time based on conscious experience. Grounded in ontological idealism and post-material economics, Hexa redefines value as the density of meaningful presence, not material accumulation.
Travelling-wave solutions for Korteweg-de Vries-Burgers equations through factorizations
Creators: name: Cornejo-Perez, O.
name: Negro, J.
name: Nieto, L. M.
name: Rosu, H. C.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: Travelling-wave solutions of the standard and compound form of Korteweg-de Vries-Burgers equations are found using factorizations of the corresponding reduced ordinary differential equations. The procedure leads to solutions of Bernoulli equations of nonlinearity 3/2 and 2 (Riccati), respectively. Introducing the initial conditions through an imaginary phase in the travelling coordinate, we obtain all the solutions previously reported, some of them being corrected here, and showing, at the same time, the presence of interesting details of these solitary waves that have been overlooked before this investigation
description: 15 pages, 7 figures; version accepted for publication at Found. Phys., in addition there is the footnote on page 12
Asymptotic theory for the Cox model with missing time-dependent covariate
Creators: name: Dupuy, Jean-François
name: Grama, Ion
name: Mesbah, Mounir
Publisher: name: arXiv
Year: 2006
Subjects: subject: Statistics Theory (math.ST)
subject: FOS: Mathematics
subject: 62N01, 62N02 (Primary) 62G05 (Secondary)

description: The relationship between a time-dependent covariate and survival times is usually evaluated via the Cox model. Time-dependent covariates are generally available as longitudinal data collected regularly during the course of the study. A frequent problem, however, is the occurence of missing covariate data. A recent approach to estimation in the Cox model in this case jointly models survival and the longitudinal covariate. However, theoretical justification of this approach is still lacking. In this paper we prove existence and consistency of the maximum likelihood estimators in a joint model. The asymptotic distribution of the estimators is given along with a consistent estimator of the asymptotic variance.
description: Published at http://dx.doi.org/10.1214/009053606000000038 in the Annals of Statistics (http://www.imstat.org/aos/) by the Institute of Mathematical Statistics (http://www.imstat.org)
A new isocoumarin from sponge endophytic fungus Aspergillus ochraceopetaliformis with cytotoxic activity
Creators: name: Zhong, Ruitong
name: Shi, Chuanling
name: Wu, Xiaoyun
name: Zou, Yiting
name: Li, Jun
name: Liang, Yongqian
Publisher: name: Taylor & Francis
Year: 2024
Subjects: subject: Biochemistry
subject: Microbiology
subject: FOS: Biological sciences
subject: Pharmacology
subject: Environmental Sciences not elsewhere classified
subject: Chemical Sciences not elsewhere classified
subject: Biological Sciences not elsewhere classified
subject: Cancer

description: A new isocoumarin, 8-hydroxy-3-methyliscoumarin-6-yl acetate (1), was isolated together with five known compounds from sponge endophytic fungus Aspergillus ochraceopetaliformis. The structure of the new compound was established based on 1D and 2D NMR spectral analysis. Compounds 1–6 were evaluated for their cytotoxic activities and antimicrobial activities. Compounds 1 and 6 display cytotoxic activities against mouse melanoma cells B16 with IC50 values 72.5 ± 2.6 and 1.0 ± 0.5 µM, respectively. Compounds 4 and 5 displayed faint antimicrobial activities of Bacillus subtilis, Micrococcus luteus and Staphylococcus aureus.
The ontogeny of acyl coenzyme A: cholesterol acyltransferase in rat liver, intestine, adipose tissue, and aorta
Creators: name: Little, Marie-Térèse E.
Publisher: name: University of British Columbia
Year: 2010

description: Epidemiological studies have shown that cholesterol is a major risk factor for the development of atherosclerosis. Since the atherosclerotic plaque develops over a long period interventions early in life may be of some benefit. In addition, it has been shown that the enzymes involved in cholesterol metabolism can be manipulated in early life. Therefore, studies of the developmental patterns of the key enzymes in cholesterol metabolism are of great importance. Acyl coenzyme A: cholesterol acyltransferase (ACAT) is the primary enzyme which catalyzes the conversion of free cholesterol to cholesterol esters in cells. A better understanding of the role and control of ACAT during development is needed in order to trace the possible causes in early life that lead to atherosclerosis in the adult. This research focused on the developmental pattern of ACAT in the rat liver, intestine, brown and white adipose tissue (BAT and WAT, respectively) and aorta. Age specific changes were observed in the rat liver, intestine and BAT. The rat liver and intestine possess significant amounts of ACAT activity throughout development and there appears to be marked variations in activity during this time. The rat BAT and WAT appear to be devoid of ACAT activity throughout development with the exception of adult BAT. Due to the small amount of the aortic tissue samples and/or the insensitivity of the assay, no definite conclusions could be made from this aortic study. In searching for factors that might control the ACAT enzyme the immediate effects of short-term manipulation of diet on the activity of ACAT were studied. The rats were all weaned early on day 18 to one of the following diets: Purina Rat Chow, high carbohydrate (HG) , high fat (HF) , or 2% cholesterol. The HF was the only diet that consistently increased hepatic ACAT activity in all the age groups. The cholesterol diets significantly increased the activity of ACAT in the 22 and 25 day old rats. The HG diet increased the activity of ACAT in the 22, 25, and 30 day old rats. No significant differences were observed between the adult control and HG diet groups. Feeding rats a HF or HG diet precipitated a dramatic drop in intestinal ACAT activity in the 22 day old animals. These effects were not observed in the older animals. The high cholesterol diet had no significant effect on the intestinal enzyme's activity in 22 day old rats. There was no significant change in the BAT and WAT ACAT activity with the experimental diets with the exception that all the experimental diets decreased ACAT activity in the adult BAT.