cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Displaced dynamics of binary mixtures in linear and nonlinear optical lattices
Creators: name: Sekh, Golam Ali
name: Salerno, Mario
name: Saha, Aparna
name: Talukdar, Benoy
Publisher: name: arXiv
Year: 2012
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: The dynamical behavior of matter wave solitons of two-component Bose-Einstein condensates (BEC) in combined linear and nonlinear optical lattices (OLs) is investigated. In particular, the dependence of the frequency of the oscillating dynamics resulting from initially slightly displaced components is investigated both analytically, by means of a variational effective potential approach for the reduced collective coordinate dynamics of the soliton, and numerically, by direct integrations of the mean field equations of the BEC mixture. We show that for small initial displacements binary solitons can be viewed as point masses connected by elastic springs of strengths related to the amplitude of the OL and to the intra and inter-species interactions. Analytical expressions of symmetric and anti-symmetric mode frequencies, are derived and occurrence of beatings phenomena in the displaced dynamics is predicted. These expressions are shown to give a very good estimation of the oscillation frequencies for different values of the intra-species interatomic scattering length, as confirmed by direct numerical integrations of the mean field Gross-Pitaevskii equations (GPE) of the mixture. The possibility to use displaced dynamics for indirect measurements of BEC mixture characteristics such as number of atoms and interatomic interactions is also suggested.
description: 8 pages, 21 figures
Cohomological localization for transverse Lie algebra actions on Riemannian foliations
Creators: name: Lin, Yi
name: Sjamaar, Reyer
Publisher: name: arXiv
Year: 2018
Subjects: subject: Differential Geometry (math.DG)
subject: Symplectic Geometry (math.SG)
subject: FOS: Mathematics
subject: 57R30 (57R91 58A12)

description: We prove localization and integration formulas for the equivariant basic cohomology of Riemannian foliations. As a corollary we obtain a Duistermaat-Heckman theorem for transversely symplectic foliations.
description: 35 pages. This revision has minor additions to introduction and preliminary section
Urban policy in Bangladesh: the state, inequality and housing crises in Dhaka city
Creators: name: Rahman, Md. Ziaur
Publisher: name: University of Calgary
Year: 2003

description: Bibliography: p. 142-154.
description: Urbanization in Less Developed Countries (LDCs) is very different from that in More Developed Countries (MDCs). While the urban growth rate of MDCs has been stable for a long time, the large cities in LDCs are growing enormously. Consequently, pollution, high density, shantytowns, as well as development of an informal economy have been the major features of cities in LDCs. Among other issues, urban housing in LDCs is a source of concern for policymakers and academics. This thesis studies housing policy in Dhaka City, and considers the implications for Dhaka's future. Dhaka, the capital city of Bangladesh, has faced a housing crisis as increases in land values and the scarcity of land create conditions of urban exclusion for a large number of urban inhabitants who live without civic amenities. Indeed, urban housing policy cannot mitigate the growing housing crisis in Dhaka City. While taking into account ecological variables such as migration and technological development, I argue that long-term historical processes related to the world system have shaped the underdevelopment of LDCs and the emergence of dominant social classes that, along with the state, ignore the needs of the majority of urban inhabitants. I then apply this framework to Dhaka by using historical analysis, textual document analysis and in-depth semi-structured interviewing. This thesis is organized into seven chapters which reconstruct the theoretical framework and historical development of Bangladesh and Dhaka City before dealing directly with housing policies in contemporary Dhaka City. Data show that state interventions in the field of housing mainly serve the interests of government officials, armed forces officers, politicians and other urban elites. The social inequality created by the state is grounded in the historical and colonial legacies of Bangladesh. These legacies, and the present state interventions that have borrowed from those legacies, have resulted in rising land values, unfairly planned urbanization, rent exploitation and land speculation. Data also show that political patronage plays a vital role in land and housing allocation in Dhaka City.
Classical Novae in Andromeda: Light Curves from the Palomar Transient Factory and GALEX
Creators: name: Cao, Yi
name: Kasliwal, Mansi M.
name: Neill, James D.
name: Kulkarni, S. R.
name: Lou, Yu-Qing
name: Ben-Ami, Sagi
name: Bloom, Joshua S.
name: Cenko, S. Bradley
name: Law, Nicholas M.
name: Nugent, Peter E.
name: Ofek, Eran O.
name: Poznanski, Dovi
name: Quimby, Robert M.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We present optical light curves of twenty-nine novae in M31 during the 2009 and 2010 observing seasons of the Palomar Transient Factory (PTF). The dynamic and rapid cadences in PTF monitoring of M31, from one day to even ten minutes, provide excellent temporal coverage of nova light curves, enabling us to record the photometric evolution of M31 novae in unprecedented detail. We also detect eight of these novae in the near ultraviolet (UV) band with the Galaxy Evolution Explorer (GALEX) satellite. Novae M31N2009-10b and 2010-11a show prominent UV emission peaking a few days prior to their optical maxima, possibly implying aspherical outbursts. Additionally, our blue-shifted spectrum of the recent outburst of PT And (M31N2010-12a) indicates that it is a recurrent nova in M31 and not a dwarf nova in the Milky Way as was previously assumed. Finally, we systematically searched for novae in all confirmed globular clusters of M31 and found only M31N 2010-10f associated with Bol 126. The specific nova rate in the M31 globular cluster system is thus about one per year which is not enhanced relative to the rate outside the globular cluster system.
description: 18 pages, 13 figures, submitted to ApJ
NA49/NA61: results and plans on beam energy and system size scan at the CERN SPS
Creators: name: Gazdzicki, M.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: This paper presents results and plans of the NA49 and NA61/SHINE experiments at the CERN Super Proton Synchrotron concerning the study of relativistic nucleus-nucleus interactions. First, the NA49 evidence for the energy threshold of creating quark-gluon plasma, the onset of deconfinement, in central lead-lead collisions around 30A GeV is reviewed. Then the status of the NA61/SHINE systematic study of properties of the onset of deconfinement is presented. Second, the search for the critical point of strongly interacting matter undertaken by both experiments is discussed. NA49 measured large fluctuations at the top SPS energy, 158A GeV, in collisions of light and medium size nuclei. They seem to indicate that the critical point exists and is located close to baryonic chemical potential of about 250 MeV. The NA61/SHINE beam energy and system size scan started in 2009 will provide evidence for the existence of the critical point or refute the interpretation of the NA49 fluctuation data in terms of the critical point.
description: 11 pages, invited talk at Quark Matter 2011
Reversible phase transition in laser-shocked 3Y-TZP ceramics observed via nanosecond time-resolved X-ray diffraction
Creators: name: Hu, Jianbo
name: Ichiyanagi, Kouhei
name: Takahashi, Hiroshi
name: Koguchi, Hiroaki
name: Akasaka, Takeaki
name: Kawai, Nobuaki
name: Nozawa, Shunsuke
name: Sato, Tokushi
name: Sasaki, Yuji C.
name: Adachi, Shin-ichi
name: Nakamura, Kazutaka G.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The high-pressure phase stability of the metastable tetragonal zirconia is still under debate. The transition dynamics of shocked Y2O3 (3 mol%) stabilized tetragonal zirconia ceramics under laser-shock compression has been directly studied using nanosecond time-resolved X-ray diffraction. The martensitic phase transformation to the monoclinic phase, which is the stable phase for pure zirconia at ambient pressure and room temperature, has been observed during compression at 5 GPa within 20 ns without any intermediates. This monoclinic phase reverts back to the tetragonal phase during pressure release. The results imply that the stabilization effect due to addition of Y2O3 is negated by the shear stress under compression.
description: 11 pages, 4 figures, draft
Economic evaluation of five strategies for the prevention of neonatal group B streptococcal (GBS) disease in Alberta
Creators: name: Raj, Sakina
Publisher: name: University of Calgary
Year: 2002
Subjects: subject: AC1 .T484 2003 R348
subject: Additional copy: AC1 .T484 2003 R348A (Medical)

description: Bibliography: p. 59-66
Stacky Hamiltonian actions and symplectic reduction
Creators: name: Hoffman, Benjamin
name: Sjamaar, Reyer
name: Zhu, Chenchang
Publisher: name: arXiv
Year: 2018
Subjects: subject: Symplectic Geometry (math.SG)
subject: Differential Geometry (math.DG)
subject: FOS: Mathematics
subject: 53D20 (57R30, 58H05)

description: We introduce the notion of a Hamiltonian action of an étale Lie group stack on an étale symplectic stack and establish versions of the Kirwan convexity theorem, the Meyer-Marsden-Weinstein symplectic reduction theorem, and the Duistermaat-Heckman theorem in this context.
description: 65 pages; appendix by Chenchang Zhu
Morse subsets of CAT(0) spaces are strongly contracting
Creators: name: Cashen, Christopher H.
Publisher: name: arXiv
Year: 2018
Subjects: subject: Group Theory (math.GR)
subject: FOS: Mathematics
subject: 20F65, 20F67

description: We prove that Morse subsets of CAT(0) spaces are strongly contracting. This generalizes and simplifies a result of Sultan, who proved it for Morse quasi-geodesics. Our proof goes through the recurrence characterization of Morse subsets.
description: 3 pages
Grothendieck Rings of 2$n^2$ dimensional Hopf Algebras $H_{2n^2}$
Creators: name: Chen, Jialei
name: Yang, Shilin
name: Wang, Dingguo
Publisher: name: arXiv
Year: 2018
Subjects: subject: Rings and Algebras (math.RA)
subject: Representation Theory (math.RT)
subject: FOS: Mathematics
subject: 16G10, 16D70, 16T99

description: In this paper, we construct the Grothendieck ring of a class of 2$n^2$-dimension semisimple Hopf Algebras $H_{2n^2}$, which can be viewed as a generalization of the 8-dimension Kac-Paljutkin Hopf algebra $K_8$. All irreducible $H_{2n^2}$-modules are classified. Furthermore, we describe the Grothendieck ring $r(H_{2n^2})$ by generators and relations explicitly.
description: 18 pages
Data-oriented Diagnostics of Pileup Effects on the Suzaku XIS
Creators: name: Yamada, Shin'ya
name: Uchiyama, Hideki
name: Dotani, Tadayasu
name: Tsujimoto, Masahiro
name: Katsuda, Satoru
name: Makishima, Kazuo
name: Takahashi, Hiromitsu
name: Noda, Hirofumi
name: Torii, Shunsuke
name: Sakurai, Soki
name: Enoto, Teruaki
name: Yuasa, Takayuki
name: Koyama, Shu
name: Bamba, Aya
Publisher: name: arXiv
Year: 2011
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We present the result of a systematic study of pileup phenomena seen in the X-ray Imaging Spectrometer, an X-ray CCD instrument, onboard the Suzaku observatory. Using a data set of observed sources in a wide range of brightness and spectral hardness, we characterized the pileup fraction, spectral hardening, and grade migration as a function of observed count rate in a frame per pixel. Using the pileup fraction as a measure of the degree of pileup, we found that the relative spectral hardening (the hardness ratio normalized to the intrinsic spectral hardness), branching ratio of split events, and that of detached events increase monotonically as the pileup fraction increases, despite the variety of brightness and hardness of the sample sources. We derived the pileup fraction as a function of radius used for event extraction. Upon practical considerations, we found that events outside of the radius with a pileup fraction of 1% or 3% are useful for spectral analysis. We present relevant figures, tables, and software for the convenience of users who wish to apply our method for their data reduction of piled-up sources.
description: 13 pages, 8 figures, pileup issues on the Suzaku XIS
The equilibrium states of open quantum systems in the strong coupling regime
Creators: name: Subasi, Y.
name: Fleming, C. H.
name: Taylor, J. M.
name: Hu, B. L.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: In this work we investigate the late-time stationary states of open quantum systems coupled to a thermal reservoir in the strong coupling regime. In general such systems do not necessarily relax to a Boltzmann distribution if the coupling to the thermal reservoir is non-vanishing or equivalently if the relaxation timescales are finite. Using a variety of non-equilibrium formalisms valid for non-Markovian processes, we show that starting from a product state of the closed system = system + environment, with the environment in its thermal state, the open system which results from coarse graining the environment will evolve towards an equilibrium state at late-times. This state can be expressed as the reduced state of the closed system thermal state at the temperature of the environment. For a linear (harmonic) system and environment, which is exactly solvable, we are able to show in a rigorous way that all multi-time correlations of the open system evolve towards those of the closed system thermal state. Multi-time correlations are especially relevant in the non-Markovian regime, since they cannot be generated by the dynamics of the single-time correlations. For more general systems, which cannot be exactly solved, we are able to provide a general proof that all single-time correlations of the open system evolve to those of the closed system thermal state, to first order in the relaxation rates. For the special case of a zero-temperature reservoir, we are able to explicitly construct the reduced closed system thermal state in terms of the environmental correlations.
description: 20 pages, 2 figures
The spacetime structure of MOND with Tully-Fisher relation and Lorentz invariance violation
Creators: name: Li, Xin
name: Chang, Zhe
Publisher: name: arXiv
Year: 2012
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: It is believed that the modification of Newtonian dynamics (MOND) is possible alternate for dark matter hypothesis. Although Bekenstein's TeVeS supplies a relativistic version of MOND, one may still wish a more concise covariant formulism of MOND. In this paper, within covariant geometrical framwork, we present another version of MOND. We show the spacetime structure of MOND with properties of Tully-Fisher relation and Lorentz invariance violation.
description: 6 pages. arXiv admin note: substantial text overlap with arXiv:1111.1383 and arXiv:1108.3443
Perturbation Theory for the Logarithm of a Positive Operator
Creators: name: Lashkari, Nima
name: Liu, Hong
name: Rajagopal, Srivatsan
Publisher: name: arXiv
Year: 2018
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: In various contexts in mathematical physics one needs to compute the logarithm of a positive unbounded operator. Examples include the von Neumann entropy of a density matrix and the flow of operators with the modular Hamiltonian in the Tomita-Takesaki theory. Often, one encounters the situation where the operator under consideration, that we denote by $Δ$, can be related by a perturbative series to another operator $Δ_0$, whose logarithm is known. We set up a perturbation theory for the logarithm $\log Δ$. It turns out that the terms in the series possess remarkable algebraic structure, which enable us to write them in the form of nested commutators plus some "contact terms."
description: 30 pages
Electrochemical synthesis and superconducting phase diagram of Cu_xBi2Se3
Creators: name: Kriener, M.
name: Segawa, Kouji
name: Ren, Zhi
name: Sasaki, Satoshi
name: Wada, Shohei
name: Kuwabata, Susumu
name: Ando, Yoichi
Publisher: name: arXiv
Year: 2011
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: The superconducting Cu_xBi_2Se_3 is an electron-doped topological insulator and is a prime candidate of the topological superconductor which still awaits discovery. The electrochemical intercalation technique for synthesizing Cu_xBi2Se3 offers good control of restricting Cu into the van-der-Waals gap and yields samples with shielding fractions of up to ~50%. We report essential details of this synthesis technique and present the established superconducting phase diagram of T_c vs x, along with a diagram of the shielding fraction vs x. Intriguingly, those diagrams suggest that there is a tendency to spontaneously form small islands of optimum superconductor in this material.
description: 6 pages, 4 figures
VoroCrust: Voronoi Meshing Without Clipping
Creators: name: Abdelkader, Ahmed
name: Bajaj, Chandrajit L.
name: Ebeida, Mohamed S.
name: Mahmoud, Ahmed H.
name: Mitchell, Scott A.
name: Owens, John D.
name: Rushdi, Ahmad A.
Publisher: name: arXiv
Year: 2019
Subjects: subject: Graphics (cs.GR)
subject: Computational Geometry (cs.CG)
subject: FOS: Computer and information sciences
subject: I.3.5

description: Polyhedral meshes are increasingly becoming an attractive option with particular advantages over traditional meshes for certain applications. What has been missing is a robust polyhedral meshing algorithm that can handle broad classes of domains exhibiting arbitrarily curved boundaries and sharp features. In addition, the power of primal-dual mesh pairs, exemplified by Voronoi-Delaunay meshes, has been recognized as an important ingredient in numerous formulations. The VoroCrust algorithm is the first provably-correct algorithm for conforming polyhedral Voronoi meshing for non-convex and non-manifold domains with guarantees on the quality of both surface and volume elements. A robust refinement process estimates a suitable sizing field that enables the careful placement of Voronoi seeds across the surface circumventing the need for clipping and avoiding its many drawbacks. The algorithm has the flexibility of filling the interior by either structured or random samples, while preserving all sharp features in the output mesh. We demonstrate the capabilities of the algorithm on a variety of models and compare against state-of-the-art polyhedral meshing methods based on clipped Voronoi cells establishing the clear advantage of VoroCrust output.
description: 18 pages (including appendix), 18 figures. Version without compressed images available on https://www.sandia.gov/app/uploads/sites/217/2023/09/VoroCrust.pdf. Supplemental materials available on https://www.sandia.gov/app/uploads/sites/217/2023/09/VoroCrust_supplemental_materials.pdf
Stochastic Acceleration by Turbulence
Creators: name: Petrosian, Vahe
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: The subject of this paper is stochastic acceleration by plasma turbulence, a process akin to the original model proposed by Fermi. We review the relative merits of different acceleration models, in particular the so called first order Fermi acceleration by shocks and second order Fermi by stochastic processes, and point out that plasma waves or turbulence play an important role in all mechanisms of acceleration. Thus, stochastic acceleration by turbulence is active in most situations. We also show that it is the most efficient mechanism of acceleration of relatively cool non relativistic thermal background plasma particles. In addition, it can preferentially accelerate electrons relative to protons as is needed in many astrophysical radiating sources, where usually there are no indications of presence of shocks. We also point out that a hybrid acceleration mechanism consisting of initial acceleration by turbulence of background particles followed by a second stage acceleration by a shock has many attractive features. It is demonstrated that the above scenarios can account for many signatures of the accelerated electrons, protons and other ions, in particular $^3$He and $^4$He, seen directly as Solar Energetic Particles and through the radiation they produce in solar flares.
description: 29 pages 7 figures for proceedings of ISSI-Bern workshop on Particle Acceleration 2011
Multifluid magnetohydrodynamic turbulence in weakly ionised astrophysical plasmas
Creators: name: Downes, Turlough P.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Initial results from simulations of 4-fluid MHD turbulence in molecular clouds are presented. The species included in the simulations are ions, electrons, negatively charged dust grains and neutrals. The results indicate that, on length scales of a few tenths of a parsec, multifluid effects have a significant impact on the properties of the turbulence. In particular, the power spectra of the velocity and magnetic fields are significantly softened, while the PDF of the densities of the charged and neutral fluids are appreciably different. Indeed, the magnetic field strength displays much less spatial structure on all lengthscales up to 1 pc than in the ideal MHD case. The assumptions of ideal MHD therefore appear to be inadequate for simulating turbulence in molecular clouds at these length scales.
description: 6 pages, 4 figures, accepted for publication in the proceedings of Astronum 2011, ASP Conference Series
An entropic feature selection method in perspective of Turing formula
Creators: name: Shi, Jingyi
name: Zhang, Jialin
name: Ge, Yaorong
Publisher: name: arXiv
Year: 2019
Subjects: subject: Machine Learning (cs.LG)
subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: Health data are generally complex in type and small in sample size. Such domain-specific challenges make it difficult to capture information reliably and contribute further to the issue of generalization. To assist the analytics of healthcare datasets, we develop a feature selection method based on the concept of Coverage Adjusted Standardized Mutual Information (CASMI). The main advantages of the proposed method are: 1) it selects features more efficiently with the help of an improved entropy estimator, particularly when the sample size is small, and 2) it automatically learns the number of features to be selected based on the information from sample data. Additionally, the proposed method handles feature redundancy from the perspective of joint-distribution. The proposed method focuses on non-ordinal data, while it works with numerical data with an appropriate binning method. A simulation study comparing the proposed method to six widely cited feature selection methods shows that the proposed method performs better when measured by the Information Recovery Ratio, particularly when the sample size is small.
Boundedness of a class of discretized reaction-diffusion systems
Creators: name: Wentz, Jacqueline M.
name: Bortz, David M.
Publisher: name: arXiv
Year: 2019
Subjects: subject: Dynamical Systems (math.DS)
subject: Quantitative Methods (q-bio.QM)
subject: FOS: Mathematics
subject: FOS: Biological sciences
subject: 34C11, 35K57, 37B25, 37F99, 65N40

description: Although the spatially continuous version of the reaction-diffusion equation has been well studied, in some instances a spatially-discretized representation provides a more realistic approximation of biological processes. Indeed, mathematically the discretized and continuous systems can lead to different predictions of biological dynamics. It is well known in the continuous case that the incorporation of diffusion can cause diffusion-driven blow-up with respect to the $L^{\infty}$ norm. However, this does not imply diffusion-driven blow-up will occur in the discretized version of the system. For example, in a continuous reaction-diffusion system with Dirichlet boundary conditions and nonnegative solutions, diffusion-driven blow up occurs even when the total species concentration is non-increasing. For systems that instead have homogeneous Neumann boundary conditions, it is currently unknown whether this deviation between the continuous and discretized system can occur. Therefore, it is worth examining the discretized system independently of the continuous system. Since no criteria exist for the boundedness of the discretized system, the focus of this paper is to determine sufficient conditions to guarantee the system with diffusion remains bounded for all time. We consider reaction-diffusion systems on a 1D domain with homogeneous Neumann boundary conditions and non-negative initial data and solutions. We define a Lyapunov-like function and show that its existence guarantees that the discretized reaction-diffusion system is bounded. These results are considered in the context of three example systems for which Lyapunov-like functions can and cannot be found.
On the linearity of order-isomorphisms
Creators: name: Lemmens, Bas
name: van Imhoff, Hent
name: van Gaans, Onno
Publisher: name: arXiv
Year: 2019
Subjects: subject: Functional Analysis (math.FA)
subject: FOS: Mathematics

description: A basic problem in the theory of partially ordered vector spaces is to characterise those cones on which every order-isomorphism is linear. We show that this is the case for every Archimedean cone that equals the inf-sup hull of the sum of its engaged extreme rays. This condition is milder than existing ones and is satisfied by, for example, the cone of positive operators in the space of bounded self-adjoint operators on a Hilbert space. We also give a general form of order-isomorphisms on the inf-sup hull of the sum of all extreme rays of the cone, which extends results of Artstein-Avidan and Slomka to infinite dimensional partially ordered vector spaces, and prove the linearity of homogeneous order-isomorphisms in a variety of new settings.
description: 14 pages
Shaping Test Inputs in Grammar-Based Fuzzing
Creators: name: Zamudio Amaya, José Antonio
Publisher: name: CISPA
Year: 2024

description: Fuzzing is an essential method for finding vulnerabilities. Conventional fuzzing looks across a wide input space, but it cannot handle systems that need intricate and specialized input patterns. Grammar-based fuzzing uses formal grammars to shape the inputs the fuzzer generates. This method is crucial for directing fuzzers to generate complicated inputs that adhere to syntactical requirements. However, existing approaches are biased towards certain input features, leading to significant portions of the solution space being under-explored or ignored. In this paper, we review the state-of-the-art methods, emphasizing the limitations of grammar-based fuzzing, and we provide a first approach for incorporating distribution sampling into fuzzing, accompanied by encouraging first findings. This work can represent a significant step towards achieving comprehensive input space exploration in grammar-based fuzzing, with implications for enhancing the robustness and reliability of the fuzzing targets.
The convexity package for Hamiltonian actions on conformal symplectic manifolds
Creators: name: Chen, Youming
name: Sjamaar, Reyer
name: Yang, Xiangdong
Publisher: name: arXiv
Year: 2019
Subjects: subject: Symplectic Geometry (math.SG)
subject: Differential Geometry (math.DG)
subject: FOS: Mathematics
subject: 53D20, 58D19

description: Consider a Hamiltonian action of a compact connected Lie group on a conformal symplectic manifold. We prove a convexity theorem for the moment map under the assumption that the action is of Lee type, which establishes an analog of Kirwan's convexity theorem in conformal symplectic geometry.
description: 31 pages, 1 figure. Appendix on conformal presymplectic manifolds added. Minor mistakes corrected
On the fundamental dichotomy in the local radio-AGN population: accretion, evolution, and host galaxy properties
Creators: name: Best, P. N.
name: Heckman, T. M.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: A sample of 18286 radio-loud AGN is presented, constructed by combining the SDSS DR7 with the NVSS and FIRST radio surveys. Using this sample, the differences between `high-excitation' (or `quasar-mode'; HERG) and `low-excitation' (`radio-mode'; LERG) radio galaxies are investigated. A primary difference is the distinct nature of the Eddington-scaled accretion rate onto their central black holes: HERGs typically have accretion rates between 1 and 10% of Eddington, whereas LERGs predominatly accrete at a rate below 1% Eddington. This is consistent with models where the population dichotomy is caused by a switch between radiatively efficient and inefficient accretion modes at low accretion rates. Local radio luminosity functions are derived separately for the two populations, showing that although LERGs dominate at low luminosity and HERGs above 1e26 W/Hz, examples of both classes are found at all radio luminosities. Using the V/Vmax test it is shown that the populations show differential cosmic evolution at fixed radio luminosity: HERGs evolve strongly at all luminosities, while LERGs show weak or no evolution. This suggests that the luminosity-dependent evolution of the radio luminosity function is driven, at least in part, by the changing relative contributions of these two populations with luminosity. The host galaxies of the sources are also distinct: HERGs are typically of lower stellar mass, with lower black hole masses, bluer colours and weaker 4000-Ang breaks indicating younger stellar populations. These results offer strong support to the picture in which HERGs are fuelled at high rates through radiative accretion disks by cold gas, perhaps from mergers and interactions, while LERGs are fuelled via radiatively inefficient flows at low accretion rates, often by gas associated with the hot X-ray haloes of their host galaxy/cluster, as part of a radio-AGN feedback loop (abridged).
description: Accepted for publication in MNRAS. 16 pages. Submission includes a data table of radio sources which is also available at http://www.roe.ac.uk/~pnb/papers/sdss_dr7_radiosources.cat
Classify Participants in Online Communities
Creators: name: Wang, Xuequn
name: Yu, Yanjun
Publisher: name: arXiv
Year: 2012
Subjects: subject: Social and Information Networks (cs.SI)
subject: FOS: Computer and information sciences

description: As online communities become increasingly popular, researchers have tried to examine participating activities in online communities as well as how to sustain online communities. However, relatively few studies have tried to understand what kinds of participants constitute online communities. In this study, we try to contribute online community research by developing "common language" to classify different participants in online communities. Specifically, we argue that the previous way to classify participants is not sufficient and accurate, and we propose a continuum to classify participants based on participants' overall trend of posting activities. In order to further online community research, we also propose potential directions for future studies.
description: 13 pages, 2 tables, 2 figures
Stratigraphy, structure, petrology, geochronology and geochemistry of the Hobson Lake area (Cariboo Mountains, British Columbia) in relation to the tectonic evolution of the southern Canadian Cordillera
Creators: name: Reid, Leslie Frances
Publisher: name: University of Calgary
Year: 2002
Subjects: subject: AC1 .T484 2002 R455A
subject: Additional copy: AC1 .T484 2003 R455 (Gallagher)

description: Bibliography: p. 188-209
Theory of citing
Creators: name: Simkin, M. V.
name: Roychowdhury, V. P.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Physics and Society (physics.soc-ph)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Applications (stat.AP)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: We present empirical data on misprints in citations to twelve high-profile papers. The great majority of misprints are identical to misprints in articles that earlier cited the same paper. The distribution of the numbers of misprint repetitions follows a power law. We develop a stochastic model of the citation process, which explains these findings and shows that about 70-90% of scientific citations are copied from the lists of references used in other papers. Citation copying can explain not only why some misprints become popular, but also why some papers become highly cited. We show that a model where a scientist picks few random papers, cites them, and copies a fraction of their references accounts quantitatively for empirically observed distribution of citations.
Spin-1/2 asymmetric diamond Ising-Heisenberg chain
Creators: name: Lisnii, Bohdan
Publisher: name: arXiv
Year: 2011
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: The ground state and the thermodynamics of a spin-1/2 asymmetric diamond Ising--Heisenberg chain are considered. For the $XYZ$ anisotropic Heisenberg interaction, the exact calculations of the free energy, entropy, heat capacity, magnetization, and magnetic susceptibility are performed using the method of decoration-iteration transformation. In the case of antiferromagnetic interactions (Ising and $XXZ$ anisotropic Heisenberg ones), the ground state, magnetization process, temperature dependence of the magnetization, magnetic susceptibility, and heat capacity are investigated. The influence of geometric frustration and quantum fluctuations on these characteristics is studied.
description: 9 pages, 7 figures (http://www.ujp.bitp.kiev.ua)
Spatially Resolving Substructures within the Massive Envelope around an Intermediate-mass Protostar: MMS 6/OMC-3
Creators: name: Takahashi, Satoko
name: Saigo, Kazuya
name: Ho, Paul T. P.
name: Tomida, Kengo
Publisher: name: arXiv
Year: 2012
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: With the Submillimeter Array, the brightest (sub)millimeter continuum source in the OMC-2/3 region, MMS 6, has been observed in the 850 um continuum emission with approximately 10 times better angular resolution than previous studies (~0.3"; ~120 AU at Orion). The deconvolved size, the mass, and the column density of MMS 6-main are estimated to be 0.32"x0.29" (132 AUx120 AU), 0.29 Mo, and 2.1x10^{25} cm^{-2}, respectively. The estimated extremely high mean number density, 1.5x10^{10} cm^{-3}, suggests that MMS 6-main is likely optically thick at 850 um. We compare our observational data with three theoretical core models: prestellar core, protostellar core + disk-like structure, and first adiabatic core. These comparisons clearly show that the observational data cannot be modeled as a simple prestellar core with a gas temperature of 20 K. A self-luminous source is necessary to explain the observed flux density in the (sub)millimeter wavelengths. Our recent detection of a very compact and energetic outflow in the CO (3-2) and HCN (4-3) lines, supports the presence of a protostar. We suggest that MMS 6 is one of the first cases of an intermediate mass protostellar core at an extremely young stage. In addition to the MMS 6-main peak, we have also spatially resolved a number of spiky structures and sub-clumps, distributed over the central 1000 AU. The masses of these sub-clumps are estimated to be 0.066-0.073 Mo, which are on the order of brown dwarf masses. Higher angular resolution and higher sensitivity observations with ALMA and EVLA will reveal the origin and nature of these structures such as whether they are originated from fragmentations, spiral arms, or inhomogeneity within the disk-like structures/envelope.
description: Accepted to ApJ
Getting the Bugs Out in Kampoon Boontawee’s A Child of the Northeast
Creators: name: Khomduen Phothisuwan
Publisher: name: คณะศิลปศาสตร์ มหาวิทยาลัยธรรมศาสตร์
Year: 2023
Subjects: Boontawee
A Child of the Northeast
wild insect
kinship
northeastern Thailand

description: วารสารศิลปศาสตร์ มหาวิทยาลัยธรรมศาสตร์, 23, 1, 69-90
Sparse random matrices and vibrational spectra of amorphous solids
Creators: name: Beltukov, Y. M.
name: Parshin, D. A.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: A random matrix approach is used to analyze the vibrational properties of amorphous solids. We investigated a dynamical matrix M=AA^T with non-negative eigenvalues. The matrix A is an arbitrary real NxN sparse random matrix with n independent non-zero elements in each row. The average values =0 and dispersion =V^2 for all non-zero elements. The density of vibrational states g(w) of the matrix M for N,n >> 1 is given by the Wigner quarter circle law with radius independent of N. We argue that for n^2 << N this model can be used to describe the interaction of atoms in amorphous solids. The level statistics of matrix M is well described by the Wigner surmise and corresponds to repulsion of eigenfrequencies. The participation ratio for the major part of vibrational modes in three dimensional system is about 0.2 - 0.3 and independent of N. Together with term repulsion it indicates clearly to the delocalization of vibrational excitations. We show that these vibrations spread in space by means of diffusion. In this respect they are similar to diffusons introduced by Allen, Feldman, et al., Phil. Mag. B 79, 1715 (1999) in amorphous silicon. Our results are in a qualitative and sometimes in a quantitative agreement with molecular dynamic simulations of real and model glasses.
description: 24 pages, 7 figures
Revisiting the $O(α^2)$ Initial State QED Corrections to $e^+e^-$ Annihilation into a Neutral Boson
Creators: name: Blümlein, J.
name: De Freitas, A.
name: Raab, C. G.
name: Schönwald, K.
Publisher: name: arXiv
Year: 2019
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: At $e^+ \, e^-$ colliders the QED--initial state radiation forms a large part of the radiative corrections. Their precise and fast evaluation is an essential asset for the experiments at LEP, the ILC and the FCC-ee, operating at high luminosity. A long standing problem in the analytic calculation of the $O(α^2)$ initial state corrections concerns a discrepancy which has been observed between the result of Berends et al. (1988) \cite{Berends:1987ab} in the limit $m_e^2 \ll s$ and the result by Bl{ü}mlein et al. (2011) \cite{Blumlein:2011mi} using massive operator matrix elements deriving this limit directly. In order to resolve this important issue we recalculated this process by integrating directly over the phase space without any approximation. For parts of the corrections we find exact solutions of the cross section in terms of iterated integrals over square root valued letters representing incomplete elliptic integrals and iterations over them. The expansion in the limit $m_e^2 \ll s$ reveals errors in the constant $O(α^2)$ term of the former calculation and yields agreement with the calculation based on massive operator matrix elements, which has impact on the experimental analysis programs. This finding also explicitly proofs the factorization of massive initial state particles in the high energy limit including the terms of $O(α^2)$ for this process.
description: 9 pages LAEX
The Development of a LAN for DVB-T Transmission and DVB-S Reception with Designed QAM Modulators and COFDM in the Island Mauritius
Creators: name: Armoogum, Sheeba
name: Armoogum, Vinaye
name: Gopaul, Jayprakash
Publisher: name: arXiv
Year: 2012
Subjects: subject: Networking and Internet Architecture (cs.NI)
subject: FOS: Computer and information sciences

description: This paper is a thorough study of a digital broadcasting system adapted to the small mountainous island of Mauritius. A digital LAN was designed with MPEG-2 signals. The compressed signals were transmitted using DVB-T and QAM modulators. QAM-16 and QAM-64 modulators were designed and tested with a simulator under critical conditions of AWGN and phase noises. Results obtained from simulation have shown that Digital video broadcast with a single frequency network (SFN) is possible in Mauritius with QAM-64 and QAM-16 modulators applying COFDM mode of transmission. However, this study has also shown that QAM-16 modulator had a better performance at low AWGN values (less than 12 dB) and can be adopted for Mauritius Island, provided that the number of transmitted channels is not high enough.
description: 20 pages, IJWMN journal paper; ISSN:0975-3834 (Online); 0975-4679 (Print)
Rethinking the Nested U-Net Approach: Enhancing Biomarker Segmentation with Attention Mechanisms and Multiscale Feature Fusion
Creators: name: Wazir, Saad
name: Kim, Daeyoung
Publisher: name: arXiv
Year: 2025
Subjects: subject: Image and Video Processing (eess.IV)
subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Computer and information sciences

description: Identifying biomarkers in medical images is vital for a wide range of biotech applications. However, recent Transformer and CNN based methods often struggle with variations in morphology and staining, which limits their feature extraction capabilities. In medical image segmentation, where data samples are often limited, state-of-the-art (SOTA) methods improve accuracy by using pre-trained encoders, while end-to-end approaches typically fall short due to difficulties in transferring multiscale features effectively between encoders and decoders. To handle these challenges, we introduce a nested UNet architecture that captures both local and global context through Multiscale Feature Fusion and Attention Mechanisms. This design improves feature integration from encoders, highlights key channels and regions, and restores spatial details to enhance segmentation performance. Our method surpasses SOTA approaches, as evidenced by experiments across four datasets and detailed ablation studies. Code: https://github.com/saadwazir/ReN-UNet
description: Published in the Proceedings of the 2024 International Conference on Medical Imaging and Computer-Aided Diagnosis (MICAD 2024), Lecture Notes in Electrical Engineering (LNEE), Volume 1372, Springer Nature, Singapore
ปัญหาความรักชายรักชาย ในวรรณกรรมเรื่องคุณหมีปาฏิหาริย์
Creators: name: นนทชัย ชูวรรณรักษ์
Publisher: name: คณะศิลปศาสตร์ มหาวิทยาลัยธรรมศาสตร์
Year: 2023
Subjects: ปัญหาความรัก
ชายรักชาย

description: วารสารศิลปศาสตร์ มหาวิทยาลัยธรรมศาสตร์, 23, 1, 91-117
A Thom isomorphism in foliated de Rham theory
Creators: name: Lin, Yi
name: Sjamaar, Reyer
Publisher: name: arXiv
Year: 2020
Subjects: subject: Differential Geometry (math.DG)
subject: FOS: Mathematics
subject: 57R30 (57R91 58A12)

description: We prove a Thom isomorphism theorem for differential forms in the setting of transverse Lie algebra actions on foliated manifolds and foliated vector bundles.
description: 29 pages. Contains material from first version of arXiv:1806.01908. Section 4 revised and expanded. Figure added
On the apparent lack of be x-ray binaries with black holes in the galaxy and in the Magellanic clouds
Creators: name: Ziolkowski, Janusz
name: Belczynski, Krzysztof
Publisher: name: arXiv
Year: 2011
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: In the Galaxy and in the Magellanic Clouds there are 170 Be X-ray binaries known to-date. Out of those, 111 host a neutron star, and for the reminder the nature of a companion is not known. None, so far, is known to host a black hole. This disparity is referred to as a missing Be -- black hole X-ray binary problem. The stellar population synthesis calculations following the formation of Be X-ray binaries in the Galaxy (Belczynski and Ziolkowski 2009) demonstrate that there is no problem of the missing Be+BH X-ray binaries for the Galaxy (the expected number of Be -- black hole X-ray binaries is 0 to 2, which is entirely consistent with the observed Galactic sample). However, the preliminary calculations for Magellanic Clouds indicate that there is a problem of the missing Be+BH X-ray binaries for the Clouds (the expected number is about 6, while none is observed). We believe, that to remove the discrepancy, one has to take into account a different history of the star formation rate in the Magellanic Clouds, with the respect to the Galaxy. New stellar population synthesis calculations are currently being carried out. An updated (as of November 2011) list of all 170 Be X-ray binaries known presently in the Galaxy and in the Magellanic Clouds is included.
description: An updated version of the review paper to be published in "Frontier Objects in Astrophysics and Particle Physics" (Procs. of the Vulcano Workshop 2010), eds. F. Giovannelli and G. Mannocchi, Bologna, Italy, 2011
Are American options European after all?
Creators: name: Christensen, Sören
name: Kallsen, Jan
name: Lenga, Matthias
Publisher: name: arXiv
Year: 2020
Subjects: subject: Mathematical Finance (q-fin.MF)
subject: Probability (math.PR)
subject: FOS: Economics and business
subject: FOS: Mathematics
subject: 60G40, 91G20, 46A20

description: We call a given American option representable if there exists a European claim which dominates the American payoff at any time and such that the values of the two options coincide in the continuation region of the American option. This concept has interesting implications from a probabilistic, analytic, financial, and numeric point of view. Relying on methods from Jourdain and Martini (2001, 2002), Chrsitensen (2014) and convex duality, we make a first step towards verifying representability of American options.
description: 45 pages, 6 figures
Fission barriers in covariant density functional theory: extrapolation to superheavy nuclei
Creators: name: Abusara, H.
name: Afanasjev, A. V.
name: Ring, P.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Systematic calculations of fission barriers allowing for triaxial deformation are performed for even-even superheavy nuclei with charge number $Z=112-120$ using three classes of covariant density functional models. The softness of nuclei in the triaxial plane leads to an emergence of several competing fission pathes in the region of the inner fission barrier in some of these nuclei. The outer fission barriers are considerably affected by triaxiality and octupole deformation. General trends of the evolution of the inner and the outer fission barrier heights are discussed as a function of the particle numbers.
description: 24 pages, 8 tables, 12 figures