cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Seminar and Training Programs Recommender System for Faculty Members of Higher Education Institution
Creators: name: Paytaren, Albert V.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Computers and Society (cs.CY)
subject: FOS: Computer and information sciences

description: This study aims to develop a personalized Recommender System that helps to address the problems encountered by the faculty members of Higher Education Institutions in the selection of Seminar and Training Programs (STP). The researcher used the Descriptive Developmental Method of research to gather information relevant to the current problems and challenges encountered and used these to develop software that addresses the identified challenges. For the development of the software, the researcher adopted a step-wise approach defined in the Incremental Developmental Model. The level of acceptance of the developed system was evaluated by 24 faculty respondents. The level of acceptance of the developed system was classified into functionality, reliability, and usability and the study garnered an evaluation score of 4.65, 4.67, and 4.67 respectively. The overall interpretation of the results of the evaluation is Highly Acceptable. The study created a system that provides seminars and training program recommendations. The developed recommender system was rated Highly Acceptable, respondents were very satisfied with the features of the system and agreed that it was functional, reliable, and usable.
Transfer maps and nonexistence of joint determinant
Creators: name: Myung, Sung
Publisher: name: arXiv
Year: 2008
Subjects: subject: K-Theory and Homology (math.KT)
subject: FOS: Mathematics
subject: 15A15; 15A27; 19M05

description: Transfer Maps, sometimes called norm maps, for Milnor's $K$-theory were first defined by Bass and Tate (1972) for simple extensions of fields via tame symbol and Weil's reciprocity law, but their functoriality had not been settled until Kato (1980). On the other hand, functorial transfer maps for the Goodwillie group are easily defined. We show that these natural transfer maps actually agree with the classical but difficult transfer maps by Bass and Tate. With this result, we build an isomorphism from the Goodwillie groups to Milnor's $K$-groups of fields, which in turn provides a description of joint determinants for the commuting invertible matrices. In particular, we explicitly determine certain joint determinants for the commuting invertible matrices over a finite field, the field of rational numbers, real numbers and complex numbers into the respective group of units of given field.
description: Some minor revisions have been made after the 1st version
Recent Advances in Two-Dimensional Metal Monochalcogenides
Creators: name: Sarkar, Abdus Salam
name: Stratakis, Emmanuel
Publisher: name: arXiv
Year: 2020
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The family of emerging low-symmetry and structural in-plane anisotropic 2D materials have been expanding rapidly in recent years. As an important emerging anisotropic 2D material, the black phosphorene (BP) analog group IVA-VI metal monochalcogenides (MMCs) have been surged recently due to their distinctive crystalline symmetries, exotic in-plane anisotropic electronic and optical response, earth abundant and environmentally friendly characteristics. In this article, we review the recent research advancements in the field of anisotropic 2D MMCs. At first, the unique wavy crystal structures together with the optical and electronic properties of such materials are discussed. The review continues with the various methods adopted for the synthesis of layered MMCs including micromechanical and liquid phase exfoliation as well as physical vapor deposition. The last part of the article focuses on the application of the structural anisotropic response of 2D MMCs in field effect transistors, photovoltaic cells nonlinear optics and valleytronic devices. Besides presenting the significant research in the field of this emerging class of 2D materials, this review also delineates the existing limitations and discusses emerging possibilities and future prospects.
Use-cases of Blockchain Technology for Humanitarian Engineering
Creators: name: Kiwelekar, Arvind W.
name: Gandhi, Sanil S.
name: Netak, Laxaman D.
name: Deosarkar, Shankar B.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Computers and Society (cs.CY)
subject: FOS: Computer and information sciences

description: Humanitarian Engineers need innovative methods to make technological interventions for solving societal problems. The emerging blockchain technology has the enormous potential to provide effective interventions in various developmental sectors, including Agriculture, Education, Health, and Transportation. In these sectors, mediators have been considered as one of the impediments for developmental work. Blockchain technology facilitates peer-to-peer business transactions, thus eliminating the role of mediators. Hence, the blockchain technology is emerging as an alternative to conventional mediator-centred solutions adopting client-server based Internet technologies. A combination of blockchain technology with other technologies can be used to address domain-specific challenges. For example, the combination of blockchain technology and Internet-of-Thing (IoT) has the potential to monitor the usage of scarce resources such as the level of ground-water and amount of energy consumption. The aims of this chapter are twofold. Firstly, it describes the primary building blocks of blockchain technology. Secondly, it illustrates various use-case scenarios of blockchain technology in the fields of Agriculture, Energy Health and others.
description: 23 pages
UV-induced mutagenesis in Escherichia coli SOS response: A quantitative model
Creators: name: Krishna, Sandeep
name: Maslov, Sergei
name: Sneppen, Kim
Publisher: name: arXiv
Year: 2007
Subjects: subject: Molecular Networks (q-bio.MN)
subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Biological sciences
subject: FOS: Physical sciences

description: Escherichia coli bacteria respond to DNA damage by a highly orchestrated series of events known as the SOS response, regulated by transcription factors, protein-protein binding and active protein degradation. We present a dynamical model of the UV-induced SOS response, incorporating mutagenesis by the error-prone polymerase, Pol V. In our model, mutagenesis depends on a combination of two key processes: damage counting by the replication forks and a long term memory associated with the accumulation of UmuD'. Together, these provide a tight regulation of mutagenesis resulting, we show, in a "digital" turn-on and turn-off of Pol V. Our model provides a compact view of the topology and design of the SOS network, pinpointing the specific functional role of each of the regulatory processes. In particular, we suggest that the recently observed second peak in the activity of promoters in the SOS regulon (Friedman et al., 2005, PLoS Biol. 3, e238) is the result of a positive feedback from Pol V to RecA filaments.
description: 21 pages, 10 figures
The Bethe ansatz in a periodic box-ball system and the ultradiscrete Riemann theta function
Creators: name: Kuniba, Atsuo
name: Sakamoto, Reiho
Publisher: name: arXiv
Year: 2006
Subjects: subject: Quantum Algebra (math.QA)
subject: Mathematical Physics (math-ph)
subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: Vertex models with quantum group symmetry give rise to integrable cellular automata at q=0. We study a prototype example known as the periodic box-ball system. The initial value problem is solved in terms of an ultradiscrete analogue of the Riemann theta function whose period matrix originates in the Bethe ansatz at q=0.
description: 11 pages, 1 figure
Continuous time random walk and parametric subordination in fractional diffusion
Creators: name: Gorenflo, Rudolf
name: Mainardi, Francesco
name: Vivoli, Alessandro
Publisher: name: arXiv
Year: 2007
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Mathematical Physics (math-ph)
subject: Probability (math.PR)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: The well-scaled transition to the diffusion limit in the framework of the theory of continuous-time random walk (CTRW)is presented starting from its representation as an infinite series that points out the subordinated character of the CTRW itself. We treat the CTRW as a combination of a random walk on the axis of physical time with a random walk in space, both walks happening in discrete operational time. In the continuum limit we obtain a generally non-Markovian diffusion process governed by a space-time fractional diffusion equation. The essential assumption is that the probabilities for waiting times and jump-widths behave asymptotically like powers with negative exponents related to the orders of the fractional derivatives. By what we call parametric subordination, applied to a combination of a Markov process with a positively oriented Lévy process, we generate and display sample paths for some special cases.
description: 28 pages, 18 figures. Workshop 'In Search of a Theory of Complexity'. Denton, Texas, August 2005
Second bound state of PsH
Creators: name: Mitroy, J.
name: Bromley, M. W. J.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: The existence of a second bound state of PsH that is electronically stable and also stable against positron annihilation by the normal 2gamma and 3gamma processes is demonstrated by explicit calculation. The state can be found in the 2,4So symmetries with the two electrons in a spin triplet state. The binding energy against dissociation into the H(2p) + Ps(2p) channel was 6.06x10-4 Hartree. The dominant decay mode of the states will be radiative decay into a configuration that autoionizes or undergoes positron annihilation. The NaPs system of the same symmetry is also electronically stable with a binding energy of 1.553x10-3 Hartree with respect to the Na(3p) + Ps(2p) channel.
description: 4 pages, 2 figures, RevTex style
PubTable-AI: An AI copilot for data curation from publication tables
Creators: name: Wang, Lei
name: Feng, Shaohong
name: Zhang, Yichuan
name: Zhang, Shijun
name: Shendre, Aditi
name: Quinney, Sara K
name: Li, Lang
Publisher: name: F1000 Research Limited
Year: 2025

description: PubTable-AI is our recent attempt to enhance data curation tasks, providing biocurators with the efficiency and reliability of extracting data from scientific literature tables.
Electric Mean Squared Radii of Lambda(1405) in Chiral Dynamics
Creators: name: Sekihara, T.
name: Hyodo, T.
name: Jido, D.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: The electric mean squared radii _E of Lambda(1405) are calculated in the chiral unitary model. We describe the Lambda(1405) as a dynamically generated resonance fully in the octet meson and octet baryon scattering. We also consider ``Lambda(1405)'' as a bound state of KbarN. For the later ``Lambda(1405),'' we obtain negative and larger absolute value of electric mean squared radius than that of ordinary baryons, which implies that Lambda(1405) have structure of widely spread K^- around p.
description: 4 pages, 1 figure, use ws-mpla.cls. Talk given at Workshop on Chiral Symmetry in Hadron and Nuclear Physics: Chiral07, Osaka, Japan, 13-16 Nov 2007
Agile SoC Development with Open ESP
Creators: name: Mantovani, Paolo
name: Giri, Davide
name: Di Guglielmo, Giuseppe
name: Piccolboni, Luca
name: Zuckerman, Joseph
name: Cota, Emilio G.
name: Petracca, Michele
name: Pilato, Christian
name: Carloni, Luca P.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Hardware Architecture (cs.AR)
subject: FOS: Computer and information sciences

description: ESP is an open-source research platform for heterogeneous SoC design. The platform combines a modular tile-based architecture with a variety of application-oriented flows for the design and optimization of accelerators. The ESP architecture is highly scalable and strikes a balance between regularity and specialization. The companion methodology raises the level of abstraction to system-level design and enables an automated flow from software and hardware development to full-system prototyping on FPGA. For application developers, ESP offers domain-specific automated solutions to synthesize new accelerators for their software and to map complex workloads onto the SoC architecture. For hardware engineers, ESP offers automated solutions to integrate their accelerator designs into the complete SoC. Conceived as a heterogeneous integration platform and tested through years of teaching at Columbia University, ESP supports the open-source hardware community by providing a flexible platform for agile SoC development.
description: Invited Paper at the 2020 International Conference On Computer Aided Design (ICCAD) - Special Session on Opensource Tools and Platforms for Agile Development of Specialized Architectures
Cost/revenue allocation on networks
Creators: name: Zhu, Richard Weiping
Publisher: name: University of British Columbia
Year: 2009

description: The thesis addresses some theoretical and computational issues arising from cost and revenue allocation problems in networks. It employs techniques from mathematical pro- gramming, combinatorial optimization and graph theory, as well as methodology devel- oped in game theory. In Chapter 2, two related cost allocation problems arising from circular networks, namely, traveling salesman cost allocation and construction cost allocation, are anal- ysed. In Chapter 3, the problem of allocating construction and maintenance cost of a tree enterprise, such as a telecommunication network or a cable-vision network, is stud- ied. In both chapters, the main solution concepts (core, kernel, prekernel and nucleolus) developed in cooperative game theory are evaluated as possible cost allocation schemes for the above allocation problems. Interesting geometric relationships among these so- lution concepts are derived and some characterizations of them are obtained. These characterizations suggest that the nucleolus is one of the most prominent choices as an allocation scheme for all the cost allocation problems considered in my thesis. Efficient, strongly polynomial algorithms are then developed for calculating the nucleolus of these games. Although the general approach in Chapters 2 and 3 is similar, the techniques used in each chapter for developing the computational algorithms are different. In the second part of the thesis, three related theoretical issues are investigated. In Chapter 4, a complete characterization of naturally submodular digraphs is derived in terms of forbidden digraph configurations and graph decomposition. One motivation for such a characterization is that naturally submodular digraphs have many desirable properties which are useful for analysing cost/revenue allocation problems and some other problems arising in logistics. In Chapter 5, a generic scheme for computing the nucleolus of a general cooperative game is developed. Finally, in Chapter 6 the possible use of the bargaining set as a cost allocation scheme is evaluated. In particular, it is shown therein that D.Granot’s bargaining set coincides with the core in simple network flow games, and it coincides with the kernel for simple, monotone, constant-sum games.
Increasing the achievable contrast of infrared interferometry with an error correlation model
Creators: name: Kammerer, Jens
name: Mérand, Antoine
name: Ireland, Michael J.
name: Lacour, Sylvestre
Publisher: name: arXiv
Year: 2020
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: Interferometric observables are strongly correlated, yet it is common practice to ignore these correlations in the data analysis process. We develop an empirical model for the correlations present in Very Large Telescope Interferometer GRAVITY data and show that properly accounting for them yields fainter detection limits and increases the reliability of potential detections. We extracted the correlations of the (squared) visibility amplitudes and the closure phases directly from intermediate products of the GRAVITY data reduction pipeline and fitted our empirical models to them. Then, we performed model fitting and companion injection and recovery tests with both simulated and real GRAVITY data, which are affected by correlated noise, and compared the results when ignoring the correlations and when properly accounting for them with our empirical models. When accounting for the correlations, the faint source detection limits improve by a factor of up to $\sim 2$ at angular separations $> 20~\rm{mas}$. For commonly used detection criteria based on $χ^2$ statistics, this mostly results in claimed detections being more reliable. Ignoring the correlations present in interferometric data is a dangerous assumption which might lead to a large number of false detections. The commonly used detection criteria (e.g. in the model fitting pipeline CANDID) are only reliable when properly accounting for the correlations; furthermore, instrument teams should work on providing full covariance matrices instead of statistically independent error bars as part of the official data reduction pipelines.
description: 16 pages, 10 figures, accepted for publication by A&A
Spin Ladder with Anisotropic Ferromagnetic Legs in a Transverse Magnetic Field
Creators: name: Japaridze, G. I.
name: Langari, A.
name: Mahdavifar, S.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We study the ground state phase diagram of a two-leg spin ladder with anisotropic ferromagnetic leg couplings under the influence of a symmetry breaking transverse magnetic field by the exact diagonalization technique. In the case of antiferromagnetic coupling between legs we identified two phase transitions in the plane of magnetic field vs interchain coupling strength. The first one corresponds to the transition from the gapped rung-singlet phase to the gapped stripe-ferromagnetic phase. The second one represents the transition from the gapped stripe-ferromagnetic phase into the fully polarized ferromagnetic phase.
Exact Diagonalization Dynamical Mean Field Theory for Multi-Band Materials: Effect of Coulomb correlations on the Fermi surface of Na_0.3CoO_2
Creators: name: Perroni, C. A.
name: Ishida, H.
name: Liebsch, A.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Dynamical mean field theory combined with finite-temperature exact diagonalization is shown to be a suitable method to study local Coulomb correlations in realistic multi-band materials. By making use of the sparseness of the impurity Hamiltonian, exact eigenstates can be evaluated for significantly larger clusters than in schemes based on full diagonalization. Since finite-size effects are greatly reduced this approach allows the study of three-band systems down to very low temperatures, for strong local Coulomb interactions and full Hund exchange. It is also shown that exact diagonalization yields smooth subband quasi-particle spectra and self-energies at real frequencies. As a first application the correlation induced charge transfer between t2g bands in Na_0.3CoO_2 is investigated. For both Hund and Ising exchange the small eg' Fermi surface hole pockets are found to be slightly enlarged compared to the non-interacting limit, in agreement with previous Quantum Monte Carlo dynamical mean field calculations for Ising exchange, but in conflict with photoemission data.
description: 9 pages, 7 figures
A Group-Theoretical Method for Natanzon Potentials in Position-Dependent Mass Background
Creators: name: Yahiaoui, S. -A.
name: Bentaiba*, M.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences
subject: 02.20.-a; 02.20.Qs; 02.20.Sv; 02.30.Fn; 03.65.Fd

description: A new manner for deriving the exact potentials is presented. By making use of conformal mappings, the general expression of the effective potentials deduced under su(1,1) algebra can be brought back to the general Natanzon hypergeometric potentials.
On the highest transcendentality in N=4 SUSY
Creators: name: Kotikov, A. V.
name: Lipatov, L. N.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We investigate the Eden-Staudacher equation for the anomalous dimension of the twist-2 operators at the large spin s in the N=4 super-symmetric gauge theory. This equation is reduced to a set of linear algebraic equations with the kernel calculated analytically. We prove that in perturbation theory the anomalous dimension is a sum of products of the Euler functions zeta(k) having the property of the maximal transcendentality with the coefficients being integer numbers. The radius of convergency of the perturbation theory is found. It is shown, that at g=infty the kernel has an essential singularity. The analytic properties of the solution of the Eden-Staudacher equation are investigated. In particular for the case of the strong coupling constant the solution has an essential singularity on the second sheet of the variable j appearing in its Laplace transformation. Similar results are derived also for the Beisert-Eden-Staudacher equation which includes the contribution from the phase related to the crossing symmetry of the underlying S-matrix. We show, that its singular solution at large coupling constants reproduces the anomalous dimension predicted from the string side of the AdS/CFT correspondence.
description: 42 pages
How the Arabidopsis Information Resource (TAIR)and AgBioData Consortium contribute to the FAIRification of Arabidopsis data
Creators: name: Reiser, Leonore
name: Bakker, Erica
name: Chen, Xingguo
name: Khosa, Kartik
name: Prithvi, Trilok
name: Proia, Alyssa
name: Sawant, Swapnil
name: Subramaniam, Shabari
name: Berardini, Tanya Z
Publisher: name: F1000 Research Limited
Year: 2025

description: The Arabidopsis Information Resource (www.arabidopsis.org) is a knowledgebase for the model plant species Arabidopsis thaliana that strives to make Arabidopsis data Findable, Accessible, Interoperable and Reusable (FAIR). Over the past 25 years, TAIR has evolved into a self-sustaining resource with over 40,000 global registered users. TAIR curators extract and annotate experimental data from the literature, primarily focusing on gene function and genetic data such as mutant alleles and phenotypes. Recently, TAIR spearheaded a first-of-its-kind community initiative to re-annotate the Arabidopsis genome, the first new structural annotation in almost a decade. TAIR is a member of the AgBioData Consortium (www.agbiodata.org), a network of agricultural related resources with a mission to consolidate standards and best practices for acquiring, displaying and reusing genomic, genetic and breeding (GGB) data. Our participation in AgBioData has yielded tangible outcomes like the development of guidelines for the Arabidopsis research community on how to make their published data more FAIR, broadly facilitating data and metadata submission, and adoption of recommended nomenclature standards applied to the new genome. This alliance of agricultural database professionals supports our goal of making Arabidopsis research data more FAIR to advance our understanding of plant gene function and ultimately improve agriculture. Some of the future directions for AgBioData include improving biocuration practices using enabling technologies such as AI and continued work towards sustainable funding for biocuration
A Serious Game Approach for the Electro-Mobility Sector
Creators: name: Silvestri, Bartolomeo
name: Rinaldi, Alessandro
name: Berardi, Antonella
name: Roccotelli, Michele
name: Acquaviva, Simone
name: Fanti, Maria Pia
Publisher: name: arXiv
Year: 2020
Subjects: subject: Computers and Society (cs.CY)
subject: FOS: Computer and information sciences

description: Serious Games (SGs) represent a new approach to improve learning processes more effectively and economically than traditional methods. This paper aims to present a SG approach for the electro-mobility context, in order to encourage the use of electric light vehicles. The design of the SG is based on the typical elements of the classic "game" with a real gameplay with different purposes. In this work, the proposed SG aims to raise awareness on environmental issues caused by mobility and actively involve users, on improving livability in the city and on real savings using alternative means to traditional vehicles. The objective of the designed tool is to propose elements of fun and entertainment for tourists or users of electric vehicles in the cities, while giving useful information about the benefits of using such vehicles, discovering touristic and interesting places in the city to discover. In this way, the user is stimulated to explore the artistic and historical aspects of the city through an effective learning process: he/she is encouraged to search the origins and the peculiarities of the monuments.
description: This paper has been presented at 2019 IEEE International Conference on Systems, Man and Cybernetics (SMC)
Voltage-controlled long-range propagation of indirect excitons in van der Waals heterostructure
Creators: name: Fowler-Gerace, L. H.
name: Choksy, D. J.
name: Butov, L. V.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Indirect excitons (IXs), also known as interlayer excitons, can form the medium for excitonic devices whose operation is based on controlled propagation of excitons. A proof of principle for excitonic devices was demonstrated in GaAs heterostructures where the operation of excitonic devices is limited to low temperatures. IXs in van der Waals transition-metal dichalcogenide (TMD) heterostructures are characterized by high binding energies making IXs robust at room temperature and offering an opportunity to create excitonic devices operating at high temperatures suitable for applications. However, a characteristic feature of TMD heterostructures is the presence of moiré superlattice potentials, which are predicted to cause modulations of IX energy reaching tens of meV. These in-plane energy landscapes can lead to IX localization, making IX propagation fundamentally different in TMD and GaAs heterostructures and making uncertain if long-range IX propagation can be realized in TMD heterostructures. In this work, we realize long-range IX propagation with the $1/e$ IX luminescence decay distances reaching 13 microns in a MoSe$_2$/WSe$_2$ heterostructure. We trace the IX luminescence along the IX propagation path. We also realize control of the long-range IX propagation: the IX luminescence signal in the drain of an excitonic transistor is controlled within 40 times by gate voltage. These data show that the long-range IX propagation is possible in TMD heterostructures with the predicted moiré superlattice potentials.
description: 10 pages, 8 figures
Modelling spatio-angular patterns in cell biology
Creators: name: Mogilner, Alexander
Publisher: name: University of British Columbia
Year: 2009

description: In this thesis I investigate the formation of spatio-angular order in populations of interacting individuals. Mathematical models are used to describe distributions of orientation, and how these evolve under different assumptions about the turning behaviour of individuals. Three types of models are introduced: in one, turning is described by a gradual direction shift (rather than abrupt transition). In two other variants, interactions between individuals cause abrupt turning and mutual displacements. Linear stability analysis and weakly non-linear (synergetics) analysis of interacting modes are used to understand the nature and stability properties of the steady state solutions. I investigate how nonhomogeneous pattern evolves close to the bifurcation point and find that individuals tend to cluster together in one direction of alignment. A special limiting case of nearly complete alignment occurs when the rotational diffusion of individual objects becomes very slow. In this case, motion of the objects is essentially deterministic, and individuals tend to gather in clusters at various orientations. To understand analytically the behaviour of the deterministic models, I represent the angular distribution as a number of 8-\ike peaks. For weak but nonzero angular diffusion, the peaks are smoothed out. The analysis of this case leads to the study of a singular perturbation problem. Next, I generalize the models to examine the dynamic behaviour of ensembles of individuals whose interactions depend on angular orientations as well as spatial positions. I show how processes such as mutual alignment, pattern formation, and aggregation can be described by sets of partial differential equations containing convolution terms. Such models appear to contain a rich diversity of possible behaviour and dynamics, depending on the details of the convolution kernels involved. The analysis of the equations, and predictions in several test cases are presented. Finally, I introduce a partial integro-differential model of aggregation phenomena. The model can be derived from a system of chemotactic partial differential equations (PDE). A linear stability analysis reveals that under certain conditions, periodic patterns may emerge. A weakly non-linear analysis predicts stripe patterns. In the limit of slow diffusion I use a Lagrangian approach to derive and analyse the gradient system and obtain periodic peak-like patterns. The possibility of existence of other types of patterns is discussed. I consider the application of the model to a phenomenon known as rippling in a swarm of social bacteria observed in Myxobacteria.
ReproducedPapers.org: Openly teaching and structuring machine learning reproducibility
Creators: name: Yildiz, Burak
name: Hung, Hayley
name: Krijthe, Jesse H.
name: Liem, Cynthia C. S.
name: Loog, Marco
name: Migut, Gosia
name: Oliehoek, Frans
name: Panichella, Annibale
name: Pawelczak, Przemyslaw
name: Picek, Stjepan
name: de Weerdt, Mathijs
name: van Gemert, Jan
Publisher: name: arXiv
Year: 2020
Subjects: subject: Computers and Society (cs.CY)
subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: We present ReproducedPapers.org: an open online repository for teaching and structuring machine learning reproducibility. We evaluate doing a reproduction project among students and the added value of an online reproduction repository among AI researchers. We use anonymous self-assessment surveys and obtained 144 responses. Results suggest that students who do a reproduction project place more value on scientific reproductions and become more critical thinkers. Students and AI researchers agree that our online reproduction repository is valuable.
description: Accepted to RRPR 2020: Third Workshop on Reproducible Research in Pattern Recognition
Gauge Symmetry and Consistent Spin-Two Theories
Creators: name: Blas, D.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We study Lagrangians with the minimal amount of gauge symmetry required to propagate spin-two particles without ghosts or tachyons. In general, these Lagrangians also have a scalar mode in their spectrum. We find that, in two cases, the symmetry can be enhanced to a larger group: the whole group of diffeomorphisms or a enhancement involving a Weyl symmetry. We consider the non-linear completions of these theories. The intuitive completions yield the usual scalar-tensor theories except for the pure spin-two cases, which correspond to two inequivalent Lagrangians giving rise to Einstein's equations. A more constructive self-consistent approach yields a background dependent Lagrangian.
description: 7 pages, proceedings of IRGAC'06; typo corrected
CHET TILLARINI O'QITISHDAGI  KOMMUNIKATIV YO'NDASHUV USULLARI
Creators: name: Kadirova Madinabonu Turgunovna, O'zbekiston xalqaro islom akademiyasi "Arab tili va adabiyoti al-Azhar" kafedrasi katta o'qituvchisi
Publisher: name: Zenodo
Year: 2024

description: Maqolada chet tillarini o‘qitishning kommunikativ usuli asosi, nutqning shakli va mazmuni ustida ishlash, kommunikativ usuli tamoyillari, chet tilidagi muloqotni o‘qitish jarayonida dramatizatsiya usullari yoritilgan.

Kalit so’zlar: kommunikativ yondashuv, nutqiy aloqa holat, dramatizatsiya, didaktika, grafik tasvir, grammatik ko‘nikma
Non-Abelian Born-Infeld action, geometry and supersymmetry
Creators: name: Cirilo-Lombardo, Diego Julio
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In this work, we propose a new non-abelian generalization of the Born- Infeld lagrangian. It is based on a geometrical property of the abelian Born-Infeld lagrangian in its determinantal form. Our goal is to extend the abelian second type Born-Infeld action to the non-abelian form preserving this geometrical property, that permits to compute the generalized volume element as a linear combination of the components of metric and the Yang-Mills energy-momentum tensors. Under BPS-like condition, the action proposed reduces to that of Yang-Mills theory, independently of the gauge group. New instanton-wormhole solution and static and spherically symmetric solution in curved space-time for a SU(2) isotopic ansatz is solved and the N=1 supersymmetric extension of the model is performed.
description: In memory of my professors Anatoly I. Pashnev and Constantino Ferro-Fontan. Full version and figures in journal
Qualitative analyses of ecological models : an automated dynamical systems approach
Creators: name: Van Coller, Lynn
Publisher: name: University of British Columbia
Year: 2009

description: Ecological models and qualitative analyses of these models can give insight into the most important mechanisms at work in an ecological system. However, the mathematics required for a detailed analysis of the behaviour of a model can be formidable. In this thesis I demonstrate how various computer packages can aid qualitative analyses by implementing techniques from dynamical systems theory. I analyse a number of continuous and discrete models to demonstrate the kinds of results and information that can be obtained. I begin with three fairly simple predator-prey models in order to introduce the terminology and techniques and to demonstrate the reliability of the computer software. I then look at a more practical system dynamics model of a sheep-pasture-hyrax-lynx system and compare the techniques with a traditional sensitivity analysis. A ratio-dependent model is the focus of the next chapter. The analysis highlights some of the biological implausibilities and mathematical difficulties associated with these models. Two discrete population genetics models are considered in the following chapters. The techniques are able to deal with the complex nonlinearities and lead to insights into the conditions under which stable homomorphisms and polymorphisms occur. The final example is a complicated discrete model of the spruce budworm-forest defoliating system. The mechanisms responsible for insect outbreaks and the relative effects of dispersal and predation are studied. In all the cases the techniques lead to a better understanding of the interactions between various processes in the system than was possible using traditional techniques. In two cases the results suggest improvements in the formulations of the models. The techniques also identify parameters or processes which are crucial for determining model behaviour. All these results are obtained fairly easily with the use of the computer packages and do not require an extensive mathematical knowledge of dynamical systems theory or intensive mathematical manipulations.
Physics of String Flux Compactifications
Creators: name: Denef, Frederik
name: Douglas, Michael R.
name: Kachru, Shamit
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We provide a qualitative review of flux compactifications of string theory, focusing on broad physical implications and statistical methods of analysis.
description: 39 pages, Latex ar2e.cls
On cosmological expansion and local physics
Creators: name: Pons, J. M.
name: Talavera, P.
Publisher: name: arXiv
Year: 2020
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We find an exact convergence in the local dynamics described by two supposedly antagonistic approaches in modern cosmology: one starting from an expanding universe perspective such as FLRW, the other based on a local model ignoring any notion of expansion, such as Schwarzschild dS. Both models are in complete agreement when the local effects of the expansion are circumscribed to the presence of the cosmological constant. We elaborate in the relevant role of static backgrounds like the Schwarzschild-dS metric in standard form as the most proper coordinatizations to describe physics at the local scale. Finally, making use of an old and too often forgotten relativistic kinematical invariant, we clarify some widespread misunderstandings on space expansion, cosmological and gravitational redshifts. As a byproduct we propose a {\sl unique and unambiguous} prescription to match the local and cosmological expression of a specific observable.
description: 14 pages + appendices
Filling the Infrared Gap: ISO Observations of 1 Jy BL Lacertae Objects
Creators: name: Padovani, P.
name: Giommi, P.
name: Abraham, P.
name: Csizmadia, S.
name: Moor, A.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The large majority of BL Lacertae objects belonging to the 1 Jy sample, the class prototype for radio-selected sources, are thought to emit most of their synchrotron power in the far IR band. Ironically, this spectral region is very sparsely sampled, with only a minority of the objects having IRAS data (most of them being upper limits or low-quality detections). We aim at filling this IR gap by presenting new, simultaneous ISOCAM and ISOPHOT observations over the 7 - 200 micron range for half the sample. A measurement of the position of the synchrotron peak frequency, nu_peak, can provide information about particle acceleration mechanisms and constrain the inverse Compton radiation that will be detected by up-coming new gamma-ray missions. We have observed 17 1 Jy BL Lacertae objects with the camera and the photometer on board the Infrared Space Observatory (ISO) satellite. The ISOPHOT data reduction was done employing a novel correction, which mitigates the effect of chopping for faint sources. Using our new ISO data, complemented by nearly-simultaneous radio and optical observations for 10 and 4 objects respectively, and other multi-frequency data, we have built the spectral energy distributions of our sources (plus a previously published one) and derived the rest-frame nu_peak. Its distribution is centered at 10^13 Hz (30 micron) and is very narrow, with 60% of the BL Lacs in the 1 - 3 10^13 Hz range. Given our set of simultaneous infrared data, these represent the best determinations available of the synchrotron peak frequencies for low-energy peaked BL Lacs. A comparison with previous such estimates, based on non-simultaneous optical and near IR data, may indicate strong nu_peak variations in a number of sources, possibly associated with large flares as observed in the high-energy peaked BL Lac MKN 501. (abridged)
description: 13 pages, 1 figure, accepted for publication in Astronomy & Astrophysics
Evaluation of Deep Convolutional Generative Adversarial Networks for data augmentation of chest X-ray images
Creators: name: Venu, Sagar Kora
Publisher: name: arXiv
Year: 2020
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Artificial Intelligence (cs.AI)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Medical image datasets are usually imbalanced, due to the high costs of obtaining the data and time-consuming annotations. Training deep neural network models on such datasets to accurately classify the medical condition does not yield desired results and often over-fits the data on majority class samples. In order to address this issue, data augmentation is often performed on training data by position augmentation techniques such as scaling, cropping, flipping, padding, rotation, translation, affine transformation, and color augmentation techniques such as brightness, contrast, saturation, and hue to increase the dataset sizes. These augmentation techniques are not guaranteed to be advantageous in domains with limited data, especially medical image data, and could lead to further overfitting. In this work, we performed data augmentation on the Chest X-rays dataset through generative modeling (deep convolutional generative adversarial network) which creates artificial instances retaining similar characteristics to the original data and evaluation of the model resulted in Fréchet Distance of Inception (FID) score of 1.289.
description: 5 pages, 4 figures
Gyromagnetic Ratio of Charged Kerr-Anti-de Sitter Black Holes
Creators: name: Aliev, Alikram N.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Astrophysics (astro-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We examine the gyromagnetic ratios of rotating and charged AdS black holes in four and higher spacetime dimensions. We compute the gyromagnetic ratio for Kerr-AdS black holes with an arbitrary electric charge in four dimensions and show that it corresponds to g=2 irrespective of the AdS nature of the spacetime. We also compute the gyromagnetic ratio for Kerr-AdS black holes with a single angular momentum and with a test electric charge in all higher dimensions. The gyromagnetic ratio crucially depends on the dimensionless ratio of the rotation parameter to the curvature radius of the AdS background. At the critical limit, when the boundary Einstein universe is rotating at the speed of light, it exhibits a striking feature leading to g=2 regardless of the spacetime dimension. Next, we extend our consideration to include the exact metric for five-dimensional rotating charged black holes in minimal gauged supergravity. We show that the value of the gyromagnetic ratio found in the "test-charge" approach remains unchanged for these black holes.
description: New section added; 6 pages, RevTex
Terahertz resonance response of biological tissue placed on a silicon nanostructure
Creators: name: Taranets, K. B.
name: Fomin, M. A.
name: Klyachkin, L. E.
name: Malyarenko, A. M.
name: Bagraev, N. T.
name: Chernev, A. L.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Applied Physics (physics.app-ph)
subject: Biological Physics (physics.bio-ph)
subject: FOS: Physical sciences

description: We present a method for the measurements of the tetrahertz (THz) resonance response of DNA oligonucleotides deposited on a silicon nanosandwich (SNS). It is shown that the SNS device can be used to generate a THz resonance response within living biotissue. The technique we propose measures changes of the longitudinal conductance and the lateral voltage with the SNS device in a Hall geometry. The mechanism of the THz response is discussed, with a model of the generation of Shapiro steps. The THz resonance response from living biotissues will aid the diagnosis of oncological disease and, in general, form the basis of a rapid diagnosis in practical medicine.
description: 9 pages, 6 figures
Data taking network for COMET Phase-I
Creators: name: Igarashi, Youichi
name: Sendai, Hiroshi
Publisher: name: arXiv
Year: 2020
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: An experiment to search for mu-e conversion named COMET is being constructed at J-PARC. The experiment will be carried out using a two-stage approach of Phase-I and Phase-II. The data taking system of Phase-I is developed based on common network technology. The data taking system consists of two kinds of networks. One is a front-end network. Its network bundles around twenty front-end devices that have a 1-Gb optical network port. And a front-end computer accepts data from the devices via its network. The other is a back-end network that collects all event fragments from the front-end computers using a 10-Gb network. We used a low price 1Gb/10Gb optical network switch for the front-end network. And direct connection between the front-end PC and an event building PC using 10-Gb optical network devices was used for the back-end network. The event building PC has ten 10-Gb network ports. And each network port of the event building PC is connected to the front-end PC's port without using a network switch. We evaluated data taking performance with an event building on these two kinds of networks. The event building throughput of the front-end network achieved 337 MiB/s. And the event building throughput of the back-end networks achieved 1.2 GiB/s. It means that we could reduce the construction cost of the data taking network using this structure without deteriorating performance. Moreover, we evaluated the writing speed of the local storage RAID disk system connected to a back-end PC by a SAS interface, and a long-distance network copy from the experiment location to the lasting storage.
description: 7 Pages, 12 figures, 22nd Virtual IEEE Real Time Conference
A cavity-QED scheme for Heisenberg-limited interferometry
Creators: name: Vitali, David
name: Kuhr, Stefan
name: Brune, Michel
name: Raimond, Jean-Michel
Publisher: name: arXiv
Year: 2006
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We propose a Ramsey interferometry experiment using an entangled state of N atoms to reach the Heisenberg limit for the estimation of an atomic phase shift if the atom number parity is perfectly determined. In a more realistic situation, due to statistical fluctuations of the atom source and the finite detection efficiency, the parity is unknown. We then achieve about half the Heisenberg limit. The scheme involves an ensemble of circular Rydberg atoms which dispersively interact successively with two initially empty microwave cavities. The scheme does not require very high-Q cavities. An experimental realization with about ten entangled Rydberg atoms is achievable with state of art apparatuses.
description: 13 pages, 7 figures
Proceedings Second Workshop on Formal Methods for Autonomous Systems
Creators: name: Luckcuck, Matt
name: Farrell, Marie
Publisher: name: arXiv
Year: 2020
Subjects: subject: Logic in Computer Science (cs.LO)
subject: Artificial Intelligence (cs.AI)
subject: Robotics (cs.RO)
subject: FOS: Computer and information sciences

description: Autonomous systems are highly complex and present unique challenges for the application of formal methods. Autonomous systems act without human intervention, and are often embedded in a robotic system, so that they can interact with the real world. As such, they exhibit the properties of safety-critical, cyber-physical, hybrid, and real-time systems. The goal of FMAS is to bring together leading researchers who are tackling the unique challenges of autonomous systems using formal methods, to present recent and ongoing work. We are interested in the use of formal methods to specify, model, or verify autonomous or robotic systems; in whole or in part. We are also interested in successful industrial applications and potential future directions for this emerging application of formal methods.