cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Finite surgeries on three-tangle pretzel knots
Creators: name: Futer, D.
name: Ishikawa, M.
name: Kabaya, Y.
name: Mattman, T.
name: Shimokawa, K.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Geometric Topology (math.GT)
subject: FOS: Mathematics
subject: 57M25; 57M05; 57M50

description: We classify Dehn surgeries on (p,q,r) pretzel knots that result in a manifold of finite fundamental group. The only hyperbolic pretzel knots that admit non-trivial finite surgeries are (-2,3,7) and (-2,3,9). Agol and Lackenby's 6-theorem reduces the argument to knots with small indices p,q,r. We treat these using the Culler-Shalen norm of the SL(2,C)-character variety. In particular, we introduce new techniques for demonstrating that boundary slopes are detected by the character variety.
description: 18 pages, 15 figures v2 - minor revisions throughout
Additional file 1 of Contents of lobetyolin, syringin, and atractylolide III in Codonopsis pilosula are related to dynamic changes of endophytes under drought stress
Creators: name: Liang, Yichuan
name: Wei, Guangfei
name: Ning, Kang
name: Zhang, Guozhuang
name: Liu, Youping
name: Dong, Linlin
name: Chen, Shilin
Publisher: name: figshare
Year: 2021
Subjects: subject: Biochemistry
subject: Cell Biology
subject: Molecular Biology
subject: Pharmacology
subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: Ecology
subject: FOS: Biological sciences
subject: 69999 Biological Sciences not elsewhere classified

description: Additional file 1. Validation for HPLC–UV method.
DISKRET MATEMATIKA VA MATEMATIK MANTIQ
Creators: name: Zaxiriddinova, Shahlo
name: Abdullayev, Dilmurod
Publisher: name: Zenodo
Year: 2025

description: Ushbu maqolada diskret matematika va matematik mantiqning shakllanish tarixi yoritiladi. Fan tarixida ko‘pincha G‘arb olimlarining hissasi tilga olinadi, biroq qadimgi Bobil, Misr, Hindiston, Xitoy va Islom olami mutafakkirlari ham bu yo‘nalishda muhim ilmiy kashfiyotlar qilgan. Xususan, Al-Xorazmiy, Forobiy, Beruniy va Nasiriddin Tusi kabi olimlarning algoritmlar, kombinatorika va mantiq sohasidagi ta’siri tahlil qilinadi. Shuningdek, diskret matematikaning zamonaviy texnologiyalar, sun’iy intellekt va kriptografiyadagi roli ham ochib beriladi.
Behaviour of wood under compression perpendicular to grain loading
Creators: name: Hall, Christopher Percival
Publisher: name: University of British Columbia
Year: 2010

description: Present methods of determining design values for compression perpendicular to grain involves the testing of specimens of one specific geometry. The geometry of this test is very different from the geometries of bearing conditions occurring in practice. It was hypothesized that this test does not represent actual bearing conditions in practice and the object of this thesis was to find a more representative method of designing for compression perpendicular to grain. This thesis found the behaviour of wood in compression perpendicular to grain loading is strongly dependent on geometry in both the linear and nonlinear ranges of applied loading. A finite element analytical model, verified by testing, was used for the analysis. The analysis found the deflection is strongly dependent on the modulus of elasticity perpendicular to grain and nearly independent of other material properties. Also the capacity was found to be dependent on a characteristic material term and only weakly dependent on other material properties. A design method, one which includes an estimate of the deflection of the bearing plate, was developed from the results of this research. This proposed design method is valid for the capacities of the different geometries of bearing conditions occurring in practice.
Furthering a Comprehensive SETI Bibliography
Creators: name: LaFond, Julia
name: Wright, Jason T.
name: Huston, Macy J.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Digital Libraries (cs.DL)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Computer and information sciences
subject: FOS: Physical sciences

description: In 2019, Reyes & Wright used the NASA Astrophysics Data System (ADS) to initiate a comprehensive bibliography for SETI accessible to the public. Since then, updates to the library have been incomplete, partly due to the difficulty in managing the large number of false positive publications generated by searching ADS using simple search terms. In preparation for a recent update, the scope of the library was revised and reexamined. The scope now includes social sciences and commensal SETI. Results were curated based on five SETI keyword searches: "SETI", "technosignature", "Fermi Paradox," "Drake Equation", and "extraterrestrial intelligence." These keywords returned 553 publications that merited inclusion in the bibliography that were not previously present. A curated library of false positive results is now concurrently maintained to facilitate their exclusion from future searches. A search query and workflow was developed to capture nearly all SETI-related papers indexed by ADS while minimizing false positives. These tools will enable efficient, consistent updates of the SETI library by future curators, and could be adopted for other bibliography projects as well.
description: 7 pages, 3 figures, accepted to JBIS
Dipole excitation of $^6$Li and $^9$Be studied with an extended quantum molecular dynamics model
Creators: name: Huang, Bo-Song
name: Ma, Yu-Gang
Publisher: name: arXiv
Year: 2021
Subjects: subject: Nuclear Theory (nucl-th)
subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: The $α$ ($^4$He) - clustering structure is a common phenomenon in light nuclei due to the decreasing contribution of mean field in few-body system. In this work we presented calculations of giant dipole resonance (GDR) excitations for two non $α$-conjugate light nuclei, namely $^{6}$Li and $^{9}$Be, within a framework of an extended quantum molecular dynamics model. For $^{6}$Li, we investigated the GDR spectra from the two-body clustering structure with $α$ + deuteron as well as the three-body structure with $α$ + $n$ + $p$, and found that the major $α$-clustering contribution on the GDR peak is located at around 31 MeV, while the resonance contributions between clusters, namely $α$ and deuteron or ($n$ + $p$), are located on the lower energy side, which can be regarded as pygmy dipole resonance (PDR). For $^{9}$Be, a mixture configuration contribution for the Chain-like structure and Borromean-like structure of the $α$ + n + $α$ configuration can somehow explain its GDR results.
description: 8 pages, 5 figures
On the Detectability of the Hydrogen 3-cm Fine Structure Line from the EoR
Creators: name: Dijkstra, Mark
name: Lidz, Adam
name: Pritchard, Jonathan R.
name: Greenhill, Lincoln J.
name: Mitchell, D. A.
name: Ord, S. M.
name: Wayth, Randal B.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: A soft ultraviolet radiation field, 10.2 eV < E <13.6 eV, that permeates neutral intergalactic gas during the Epoch of Reionization (EoR) excites the 2p (directly) and 2s (indirectly) states of atomic hydrogen. Because the 2s state is metastable, the lifetime of atoms in this level is relatively long, which may cause the 2s state to be overpopulated relative to the 2p state. It has recently been proposed that for this reason, neutral intergalactic atomic hydrogen gas may be detected in absorption in its 3-cm fine-structure line (2s_1/2 -> 2p_3/2) against the Cosmic Microwave Background out to very high redshifts. In particular, the optical depth in the fine-structure line through neutral intergalactic gas surrounding bright quasars during the EoR may reach tau~1e-5. The resulting surface brightness temperature of tens of micro K (in absorption) may be detectable with existing radio telescopes. Motivated by this exciting proposal, we perform a detailed analysis of the transfer of Lyman beta,gamma,delta,... radiation, and re-analyze the detectability of the fine-structure line in neutral intergalactic gas surrounding high-redshift quasars. We find that proper radiative transfer modeling causes the fine-structure absorption signature to be reduced tremendously to tau< 1e-10. We therefore conclude that neutral intergalactic gas during the EoR cannot reveal its presence in the 3-cm fine-structure line to existing radio telescopes.
description: 7 pages, 4 figures, MNRAS in press; v2. some typos fixed
Additional file 2 of Contents of lobetyolin, syringin, and atractylolide III in Codonopsis pilosula are related to dynamic changes of endophytes under drought stress
Creators: name: Liang, Yichuan
name: Wei, Guangfei
name: Ning, Kang
name: Zhang, Guozhuang
name: Liu, Youping
name: Dong, Linlin
name: Chen, Shilin
Publisher: name: figshare
Year: 2021
Subjects: subject: Biochemistry
subject: Cell Biology
subject: Molecular Biology
subject: Pharmacology
subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: Ecology
subject: FOS: Biological sciences
subject: 69999 Biological Sciences not elsewhere classified

description: Additional file 2: Figure S1. Abundances of enriched taxa in different parts of C. pilosula. Table S1. Numbers and average lengths of microbial sequences in leaf part of C. pilosula. Table S2. Numbers and average lengths of microbial sequences in stem part of C. pilosula. Table S3. Numbers and average lengths of microbial sequences in root part of C. pilosula.
Structure and rheological properties of model microemulsion networks filled with nanoparticles
Creators: name: Puech, Nicolas
name: Mora, Serge
name: Testard, Vincent
name: Porte, Grégoire
name: Ligoure, Christian
name: Grillo, Isabelle
name: Phou, Ty
name: Oberdisse, Julian
Publisher: name: arXiv
Year: 2008
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: Model microemulsion networks of oil droplets stabilized by non ionic surfactant and telechelic polymer C18-PEO(10k)-C18 have been studied for two droplet-to-polymer size ratios. The rheological properties of the networks have been measured as a function of network connectivity and can be described in terms of simple percolation laws. The network structure has been characterised by Small Angle Neutron Scattering. A Reverse Monte Carlo approach is used to demonstrate the interplay of attraction and repulsion induced by the copolymer. These model networks are then used as matrix for the incorporation of silica nanoparticles (R=10nm), individual dispersion being checked by scattering. A strong impact on the rheological properties is found for silica volume fractions up to 9%.
Variational Formulation for Quaternionic Quantum Mechanics
Creators: name: de Melo, C. A. M.
name: Pimentel, B. M.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Quantum Physics (quant-ph)
subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: A quaternionic version of Quantum Mechanics is constructed using the Schwinger's formulation based on measurements and a Variational Principle. Commutation relations and evolution equations are provided, and the results are compared with other formulations.
description: Talk given at ICCA*, May 26-30 of 2008, Campinas, SP, Brazil. 18 pages, no figure
Nonthermal X-Rays from Supernova Remnant G330.2+1.0 and the Characteristics of its Central Compact Object
Creators: name: Park, Sangwook
name: Kargaltsev, Oleg
name: Pavlov, George G.
name: Mori, Koji
name: Slane, Patrick O.
name: Hughes, John P.
name: Burrows, David N.
name: Garmire, Gordon P.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present results from our X-ray data analysis of the SNR G330.2+1.0 and its CCO, CXOU J160103.1--513353 (J1601). Using our XMM-Newton and Chandra observations, we find that the X-ray spectrum of J1601 can be described by neutron star atmosphere models (T ~ 2.5--3.7 MK). Assuming the distance of d ~ 5 kpc for J1601 as estimated for SNR G330.2+1.0, a small emission region of R ~ 1--2 km is implied. X-ray pulsations previously suggested by Chandra are not confirmed by the XMM-Newton data, and are likely not real. However, our timing analysis of the XMM-Newton data is limited by poor photon statistics, and thus pulsations with a relatively low amplitude (i.e., an intrinsic pulsed-fraction < 40%) cannot be ruled out. Our results indicate that J1601 is a CCO similar to that in the Cassiopeia A SNR.X-ray emission from SNR G330.2+1.0 is dominated by power law continuum (Gamma ~ 2.1--2.5) which primarily originates from thin filaments along the boundary shell. This X-ray spectrum implies synchrotron radiation from shock-accelerated electrons with an exponential roll-off frequency ~ 2--3 x 10^17 Hz. For the measured widths of the X-ray filaments (D ~ 0.3 pc) and the estimated shock velocity (v_s ~ a few x 10^3 km s^-1), a downstream magnetic field B ~ 10--50 $μ$G is derived. The estimated maximum electron energy E_max ~ 27--38 TeV suggests that G330.2+1.0 is a candidate TeV gamma-ray source. We detect faint thermal X-ray emission in G330.2+1.0. We estimate a low preshock density n_0 ~ 0.1 cm^-3, which suggests a dominant contribution from an inverse Compton mechanism (than the proton-proton collision) to the prospective gamma-ray emission. Follow-up deep radio, X-ray, and gamma-ray observations will be essential to reveal the details of the shock parameters and the nature of particle accelerations in this SNR.
description: 26 pages, 3 tables, 7 figures (4 color figures), Accepted by ApJ
Screening of common synthetic polymers for depolymerization by subcritical hydrothermal liquefaction
Creators: name: Passos, Juliano Souza dos
name: Glasius, Marianne
name: Biller, Patrick
Publisher: name: arXiv
Year: 2021
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: Hydrothermal liquefaction could potentially utilize mixed plastic wastes for sustainable biocrude production, however the fate of plastics under HTL is largely unexplored for the same reaction conditions. In this study, we evaluate how synthetic waste polymers can be depolymerized to bio-crude or platform chemicals using HTL at typical conditions expected in future commercial applications with and without alkali catalyst (potassium hydroxide). We evaluate different characteristics for HTL processing of poly-acrylonitrile-butadiene-styrene (ABS), Bisphenol-A Epoxy-resin, high-density polyethylene (HDPE), low density PE (LDPE), polyamide 6 (PA6), polyamide 66 (PA66), polyethylene terephthalate (PET), polycarbonate (PC), polypropylene (PP), polystyrene (PS) and polyurethane (PUR) at 350 °C and 20 minutes residence time. Polyolefins and PS showed little depolymerization due to lack of reactive sites for hydrolysis. HTL of PC and Epoxy yielded predominantly bisphenol-A in oil fraction and phenols in aqueous phase. PA6 and PA66 yielded one of its monomers caprolactam and a range of platform chemicals in the aqueous phase. PET produces both original monomers. PUR yields a complex oil containing similar molecules to its monomers and longer hydrocarbons. Our results show how HTL can depolymerizes several different synthetic polymers and highlights which of those are the most attractive or are unsuitable for subcritical processing.
MARKAZIY, PARALLEL PROYEKSIYALASH VA ULARNING XOSSALARI
Creators: name: Zaxiriddinova, Shahlo
name: Raxmatova, Gulandom
Publisher: name: Zenodo
Year: 2025

description: Mazkur maqolada markaziy va parallel proyeksiyalashning asosiy tushunchalari, ularning farqlari va xossalari yoritib berilgan. Shuningdek, ushbu proyeksiyalash usullarining ilmiy va amaliy ahamiyati, ularning geometriya, chizma geometriya va muhandislik sohalaridagi qo‘llanilishiga alohida e’tibor qaratilgan.
Radio continuum observations of the candidate supermassive black hole in the dwarf elliptical VCC128
Creators: name: Buyle, Pieter
name: De Rijcke, Sven
name: Debattista, Victor P.
name: Ferreras, Ignacio
name: Pasquali, Anna
name: Seth, Anil
name: Morelli, Lorenzo
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The presence of black holes (BHs) at the centers of dwarf elliptical galaxies (dEs) has been argued both theoretically and observationally. Using archival HST/WFPC2 data, we found the Virgo cluster dwarf elliptical galaxy VCC128 to harbor a binary nucleus, a feature that is usually interpreted as the observable signature of a stellar disk orbiting a central massive black hole. Debattista et al. 2006 estimated its mass M sim 6 10^6 - 5 10^7 Msun. One of the most robust means of verifying the existence of a BH is radio continuum and/or X-ray emission, however because of the deficiency of gas in dEs, radio continuum emission forms the best option here. We have tried to detect the X-band radio emission coming from the putative black hole in VCC128 when it accretes gas from the surrounding ISM. While we made a positive 4 sigma detection of a point source 4.63'' south-west of the binary nucleus, no statistically significant evidence for emission associated with the nuclei themselves was detected. This implies either that VCC128 has no massive central black hole, which makes the nature of the binary nucleus hard to explain, or, if it has a central black hole, that the physical conditions of the ISM (predominantly its density and temperature) and/or of the surrounding accretion disk do not allow for efficient gas accretion onto the black hole, making the quiescent black hole very hard to detect at radio wavelengths.
description: 4 pages, 1 figure, accepted for publication in ApJ
Two-stage treatment of a landfill leachate: aerobic biostabilization with lime-magnesium polishing
Creators: name: Wong, Phillip Thomas
Publisher: name: University of British Columbia
Year: 2010

description: In the biostabilization phase, a BOD₅:N:P loading of 100:3.2:1.1 was found to be "adequate" for treatment, while the standard nutrient loading of 100:5:1 was found to be "excessive". This was evident by the much higher nitrite-nitrate concentration in the effluent of the BOD₅:N:P = 100:5:1 reactor. Organic removal by the first stage units was excellent. BOD₅ and COD removals of at least 99.4 and 96.4 percent, respectively, were achieved under all conditions investigated, except for the two units close to washout conditions (the 5-day sludge age units at 10° and 5°C). Temperature and sludge age also had minimal effects on the removal of metals, except under the two conditions mentioned above; removals were greater than 90 percent, for most of the metals monitored. The reactors only reduced magnesium concentrations by 32.5 to 52.7 percent, mainly because the mixed liquor pH's (about 8.5) were not high enough for magnesium precipitation as magnesium hydroxide. For the lime-magnesium polishing step, samples were dosed with lime to pH levels of 10.0, 10.7, and 11.4. Magnesium doses of 0, 10, 20, 35 and 50 mg/L were then added to the samples at each pH level. In general, removals of impurities were not enhanced significantly by these magnesium additions. This was due, in part, to the initial low concentrations of contaminants; in addition, there already existed greater than 20 mg/L of magnesium in the samples. Aerobic biostabilization, at a sludge age greater than 15 days, at BOD₅:N:P = 100:3.2:1.1, and liquid temperatures of at least 3°C, followed by lime precipitation (to pH greater than or equal to 10.0), is capable of reducing most contaminants of a medium strength leachate (BOD₅ = 8090 mg/L) to levels below local (Province of British Columbia) pollution control objectives.
Dynamical screening of the Coulomb interaction for two confined electrons in a magnetic field
Creators: name: Simonovic, N. S.
name: Nazmitdinov, R. G.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We show that a difference in time scales of vertical and lateral dynamics permits one to analyze the problem of interacting electrons confined in an axially symmetric three-dimensional potential with a lateral oscillator confinement by means of the effective two-dimensional Hamiltonian with a screened Coulomb interaction. Using an adiabatic approximation based on action-angle variables, we present solutions for the effective charge of the Coulomb interaction (screening) for a vertical confinement potential simulated by parabolic, square, and triangular wells. While for the parabolic potential the solution for the effective charge is given in a closed anlytical form, for the other cases similar solutions can be easily calculated numerically.
description: 10 pages, 6 figures
Additional file 1 of Is the combination of bilateral pulmonary nodules and mosaic attenuation on chest CT specific for DIPNECH?
Creators: name: Samhouri, Bilal F.
name: Koo, Chi Wan
name: Yi, Eunhee S.
name: Ryu, Jay H.
Publisher: name: figshare
Year: 2021
Subjects: subject: Space Science
subject: Medicine
subject: Genetics
subject: FOS: Biological sciences
subject: Physiology
subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: 69999 Biological Sciences not elsewhere classified
subject: Cancer
subject: Science Policy
subject: 111714 Mental Health
subject: FOS: Health sciences

description: Additional file 1. Chest CT scan findings divided by diagnostic category across the entire cohort (n = 51).
Spectroscopy of $NbSe_2$ using Energy-Tunable Defect-Embedded Quantum Dots
Creators: name: Devidas, T. R.
name: Keren, Itai
name: Steinberg, Hadar
Publisher: name: arXiv
Year: 2021
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: Quantum dots have sharply defined energy levels, which can be used for high resolution energy spectroscopy when integrated in tunneling circuitry. Here we report dot-assisted spectroscopy measurements of the superconductor $NbSe_2$, using a van der Waals device consisting of a vertical stack of $graphene-MoS_2-NbSe_2$. The $MoS_2$ tunnel barriers host naturally occurring defects which function as quantum dots, allowing transport via resonant tunneling. The dot energies are tuned by an electric field exerted by a back-gate, which penetrates the graphene source electrode. Scanning the dot potential across the superconductor Fermi energy, we reproduce the $NbSe_2$ density of states which exhibits a well-resolved two-gap spectrum. Surprisingly, we find that the dot-assisted current is dominated by the lower energy feature of the two $NbSe_2$ gaps, possibly due to a selection rule which favors coupling between the dots and the orbitals which exhibit this gap.
description: 22 pages, 6 figures
Intermediate Mass Black Hole Induced Quenching of Mass Segregation in Star Clusters
Creators: name: Gill, Michael
name: Trenti, Michele
name: Miller, M. Coleman
name: van der Marel, Roeland
name: Hamilton, Douglas
name: Stiavelli, Massimo
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: In many theoretical scenarios it is expected that intermediate-mass black holes (IMBHs, with masses M ~ 100-10000 solar masses) reside at the centers of some globular clusters. However, observational evidence for their existence is limited. Several previous numerical investigations have focused on the impact of an IMBH on the cluster dynamics or brightness profile. Here we instead present results from a large set of direct N-body simulations including single and binary stars. These show that there is a potentially more detectable IMBH signature, namely on the variation of the average stellar mass between the center and the half-light radius. We find that the existence of an IMBH quenches mass segregation and causes the average mass to exhibit only modest radial variation in collisionally relaxed star clusters. This differs from when there is no IMBH. To measure this observationally requires high resolution imaging at the level of that already available from the Hubble Space Telescope (HST) for the cores of a large sample of galactic globular clusters. With a modest additional investment of HST time to acquire fields around the half-light radius, it will be possible to identify the best candidate clusters to harbor an IMBH. This test can be applied only to globulars with a half-light relaxation time less than or equal to 1 Gyr, which is required to guarantee efficient energy equipartition due to two-body relaxation.
description: 15 pages, 3 figures, ApJ, in press
Flow computations on imprecise terrains
Creators: name: Driemel, Anne
name: Haverkort, Herman
name: Löffler, Maarten
name: Silveira, Rodrigo
Publisher: name: Journal of Computational Geometry
Year: 2013

description: We study water flow computation on imprecise terrains. We consider two approaches to modeling flow on a terrain: one where water flows across the surface of a polyhedral terrain in the direction of steepest descent, and one where water only flows along the edges of a predefined graph, for example a grid or a triangulation. In both cases each vertex has an imprecise elevation, given by an interval of possible values, while its (x,y)-coordinates are fixed. For the first model, we show that the problem of deciding whether one vertex may be contained in the watershed of another is NP-hard. In contrast, for the second model we give a simple O(nlog n) time algorithm to compute the minimal and the maximal watershed of a vertex, or a set of vertices, where n is the number of edges of the graph. On a grid model, we can compute the same in O(n) time.
description: Journal of Computational Geometry, Vol. 4 No. 1 (2013)
Towards Ubiquitous Indoor Positioning: Comparing Systems across Heterogeneous Datasets
Creators: name: Torres-Sospedra, Joaquín
name: Silva, Ivo
name: Klus, Lucie
name: Quezada-Gaibor, Darwin
name: Crivello, Antonino
name: Barsocchi, Paolo
name: Pendão, Cristiano
name: Lohan, Elena Simona
name: Nurmi, Jari
name: Moreira, Adriano
Publisher: name: arXiv
Year: 2021
Subjects: subject: Systems and Control (eess.SY)
subject: Machine Learning (cs.LG)
subject: Performance (cs.PF)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Computer and information sciences

description: The evaluation of Indoor Positioning Systems (IPS) mostly relies on local deployments in the researchers' or partners' facilities. The complexity of preparing comprehensive experiments, collecting data, and considering multiple scenarios usually limits the evaluation area and, therefore, the assessment of the proposed systems. The requirements and features of controlled experiments cannot be generalized since the use of the same sensors or anchors density cannot be guaranteed. The dawn of datasets is pushing IPS evaluation to a similar level as machine-learning models, where new proposals are evaluated over many heterogeneous datasets. This paper proposes a way to evaluate IPSs in multiple scenarios, that is validated with three use cases. The results prove that the proposed aggregation of the evaluation metric values is a useful tool for high-level comparison of IPSs.
description: to appear in 2021 International Conference on Indoor Positioning and Indoor Navigation (IPIN), 29 Nov. - 2 Dec. 2021, Lloret de Mar, Spain
Bathymetry and morphometric analysis of Greek natural lakes through a hybrid GIS-acoustic methodology
Creators: name: Perivolioti, Triantafyllia-Maria
name: Apostolakis, Antonios
name: Papadimos, Dimitrios
name: Tsiaoussi, Vasiliki
Publisher: name: Taylor & Francis
Year: 2025
Subjects: subject: Environmental Sciences not elsewhere classified
subject: Ecology
subject: FOS: Biological sciences
subject: Marine Biology
subject: Inorganic Chemistry
subject: FOS: Chemical sciences
subject: Science Policy

description: Homogeneous and up-to-date bathymetric information on lakes is essential to improve limnological knowledge and produce evidence-based lake monitoring, assessment methods, and river basin management plans according to Water Framework Directive (WFD). The present study focused on the production of updated bathymetric information on the main natural Greek lakes and their morphometric analysis. The aim was to address the knowledge gap by providing updated homogeneous and accurate bathymetric information for the main freshwater natural lakes of Greece as part of the National Monitoring Network of Lakes in the context of WFD. We surveyed 14 freshwater lakes in mainland Greece using a dual frequency echosounder. Using the acoustic data collected during the surveys, bathymetric digital terrain models (DTMs) were produced for each lake and used to estimate morphometric characteristics (mean/maximum depth, volume, lake depth ratio, volume development, mean lake diameter, relative depth ratio, shoreline development factor, hypsographic curve). This analysis demonstrated the potential of the morphometric approach to generate valuable information using up-to-date bathymetric DTMs. The geospatial data derived by the present study are available through an online repository, the Greek National Monitoring Network of Lakes (http://ekbygis.biodiversity-info.gr/geoserver/web/). These data provide a valuable database for the advancement of limnological knowledge, the implementation of comprehensive monitoring programmes, and informed decision making in water resources management.
Aligning Robot Navigation Behaviors with Human Intentions and Preferences
Creators: name: Karnan, Haresh
Publisher: name: arXiv
Year: 2024
Subjects: subject: Robotics (cs.RO)
subject: Artificial Intelligence (cs.AI)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Recent advances in the field of machine learning have led to new ways for mobile robots to acquire advanced navigational capabilities. However, these learning-based methods raise the possibility that learned navigation behaviors may not align with the intentions and preferences of people, a problem known as value misalignment. To mitigate this risk, this dissertation aims to answer the question: "How can we use machine learning methods to align the navigational behaviors of autonomous mobile robots with human intentions and preferences?" First, this dissertation addresses this question by introducing a new approach to learning navigation behaviors by imitating human-provided demonstrations of the intended navigation task. This contribution allows mobile robots to acquire autonomous visual navigation capabilities through imitation, using a novel objective function that encourages the agent to align with the human's navigation objectives and penalizes misalignment. Second, this dissertation introduces two algorithms to enhance terrain-aware off-road navigation for mobile robots by learning visual terrain awareness in a self-supervised manner. This contribution enables mobile robots to respect a human operator's preferences for navigating different terrains in urban outdoor environments, while extrapolating these preferences to visually novel terrains by leveraging multi-modal representations. Finally, in the context of robot navigation in human-occupied environments, this dissertation introduces a dataset and an algorithm for robot navigation in a socially compliant manner in both indoor and outdoor environments. In summary, the contributions in this dissertation take significant steps toward addressing the value alignment problem in autonomous navigation, enabling mobile robots to navigate autonomously with objectives that align with human intentions and preferences.
description: Haresh Karnan's PhD Dissertation A recording of the defense talk can be accessed here: https://youtu.be/MssiO6g0Gb8
Adversarial Machine Learning for Cybersecurity and Computer Vision: Current Developments and Challenges
Creators: name: Xi, Bowei
Publisher: name: arXiv
Year: 2021
Subjects: subject: Cryptography and Security (cs.CR)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: We provide a comprehensive overview of adversarial machine learning focusing on two application domains, i.e., cybersecurity and computer vision. Research in adversarial machine learning addresses a significant threat to the wide application of machine learning techniques -- they are vulnerable to carefully crafted attacks from malicious adversaries. For example, deep neural networks fail to correctly classify adversarial images, which are generated by adding imperceptible perturbations to clean images.We first discuss three main categories of attacks against machine learning techniques -- poisoning attacks, evasion attacks, and privacy attacks. Then the corresponding defense approaches are introduced along with the weakness and limitations of the existing defense approaches. We notice adversarial samples in cybersecurity and computer vision are fundamentally different. While adversarial samples in cybersecurity often have different properties/distributions compared with training data, adversarial images in computer vision are created with minor input perturbations. This further complicates the development of robust learning techniques, because a robust learning technique must withstand different types of attacks.
description: Published in WIREs Computational Statistics
Additional file 1 of Divergence time estimation of Galliformes based on the best gene shopping scheme of ultraconserved elements
Creators: name: Chen, De
name: Hosner, Peter A.
name: Dittmann, Donna L.
name: O’Neill, John P.
name: Birks, Sharon M.
name: Braun, Edward L.
name: Kimball, Rebecca T.
Publisher: name: figshare
Year: 2021
Subjects: subject: Geology
subject: FOS: Earth and related environmental sciences

description: Additional file 1: Figure S1. Species tree for the Galliformes from the 135-taxon dataset. Estimation was conducted on the 75% complete matrix using SVDquartets.
Bio-Inspired Adversarial Attack Against Deep Neural Networks
Creators: name: Xi, Bowei
name: Chen, Yujie
name: Fei, Fan
name: Tu, Zhan
name: Deng, Xinyan
Publisher: name: arXiv
Year: 2021
Subjects: subject: Cryptography and Security (cs.CR)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: The paper develops a new adversarial attack against deep neural networks (DNN), based on applying bio-inspired design to moving physical objects. To the best of our knowledge, this is the first work to introduce physical attacks with a moving object. Instead of following the dominating attack strategy in the existing literature, i.e., to introduce minor perturbations to a digital input or a stationary physical object, we show two new successful attack strategies in this paper. We show by superimposing several patterns onto one physical object, a DNN becomes confused and picks one of the patterns to assign a class label. Our experiment with three flapping wing robots demonstrates the possibility of developing an adversarial camouflage to cause a targeted mistake by DNN. We also show certain motion can reduce the dependency among consecutive frames in a video and make an object detector "blind", i.e., not able to detect an object exists in the video. Hence in a successful physical attack against DNN, targeted motion against the system should also be considered.
description: Published in SafeAI 2020
Non naturally reductive Einstein metrics on the orthogonal group via real flag manifolds
Creators: name: Arvanitoyeorgos, Andreas
name: Sakane, Yusuke
name: Statha, Marina
Publisher: name: arXiv
Year: 2024
Subjects: subject: Differential Geometry (math.DG)
subject: FOS: Mathematics
subject: 53C25, 53C30, 13P10, 65H10, 68W30

description: We obtain new invariant Einstein metrics on the compact Lie groups
 $\SO(n)$ which are not naturally reductive. This is achieved by using the real flag manifolds $\SO(k_1+\cdots +k_p)/\SO(k_1)\times\cdots\times\SO(k_p)$ and by imposing certain symmetry assumptions in the set of all
 left-invariant metrics on $\SO(n)$.
description: 14 pages
Two New Large Separation Gravitational Lenses from SDSS
Creators: name: Belokurov, V.
name: Evans, N. W.
name: Hewett, P. C.
name: Moiseev, A.
name: McMahon, R. G.
name: Sanchez, S. F.
name: King, L. J.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present discovery images, together with follow-up imaging and spectroscopy, of two large separation gravitational lenses found by our survey for wide arcs (the CASSOWARY). The survey exploits the multicolor photometry of the Sloan Digital Sky Survey to find multiple blue components around red galaxies. CASSOWARY~2 (or "the Cheshire Cat") is composed of two massive early-type galaxies at z = 0.426 and 0.432 respectively lensing two background sources, the first a star-forming galaxy at z = 0.97 and the second a high redshift galaxy (z> 1.4). There are at least three images of the former source and probably four or more of the latter, arranged in two giant arcs. The mass enclosed within the larger arc of radius 11 arcsecs is about 33 x 10^{12} solar masses. CASSOWARY~3 comprises an arc of three bright images of a z = 0.725 source, lensed by a foreground elliptical at z = 0.274. The radius of the arc is about 4 arcsecs and the enclosed mass is 2.5 x 10^{12} solar masses. Together with earlier discoveries like the Cosmic Horseshoe and the 8 O'Clock Arc, these new systems, with separations intermediate between the arcsecond separation lenses of typical strong galaxy lensing and the larger separation cluster lenses, probe the very high end of the galaxy mass function.
description: MNRAS, in press. Revised version contains much more detail on the search algorithm. The CASSOWARY website gives further candidates for which follow-up is needed
Additional file 2 of Divergence time estimation of Galliformes based on the best gene shopping scheme of ultraconserved elements
Creators: name: Chen, De
name: Hosner, Peter A.
name: Dittmann, Donna L.
name: O’Neill, John P.
name: Birks, Sharon M.
name: Braun, Edward L.
name: Kimball, Rebecca T.
Publisher: name: figshare
Year: 2021
Subjects: subject: Geology
subject: FOS: Earth and related environmental sciences

description: Additional file 2: Figure S2. ML phylogeny for the Galliformes from the 48-taxon dataset. Estimation was conducted on the 75% complete matrix using RaxML.
Manipulating the quantum information of the radial modes of trapped ions: Linear phononics, entanglement generation, quantum state transmission and non-locality tests
Creators: name: Serafini, A.
name: Retzker, A.
name: Plenio, M. B.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We present a detailed study on the possibility of manipulating quantum information encoded in the "radial" modes of arrays of trapped ions (i.e., in the ions' oscillations orthogonal to the trap's main axis). In such systems, because of the tightness of transverse confinement, the radial modes pertaining to different ions can be addressed individually. In the first part of the paper we show that, if local control of the radial trapping frequencies is available, any linear optical and squeezing operation on the locally defined modes - on single as well as on many modes - can be reproduced by manipulating the frequencies. Then, we proceed to describe schemes apt to generate unprecedented degrees of bipartite and multipartite continuous variable entanglement under realistic noisy working conditions, and even restricting only to a global control of the trapping frequencies. Furthermore, we consider the transmission of the quantum information encoded in the radial modes along the array of ions, and show it to be possible to a remarkable degree of accuracy, for both finite-dimensional and continuous variable quantum states. Finally, as an application, we show that the states which can be generated in this setting allow for the violation of multipartite non-locality tests, by feasible displaced parity measurements. Such a demonstration would be a first test of quantum non-locality for "massive" degrees of freedom (i.e., for degrees of freedom describing the motion of massive particles).
description: 21 pages; this paper, presenting a far more extensive and detailed analysis, completely supersedes arXiv:0708.0851
Bi-Level Poisoning Attack Model and Countermeasure for Appliance Consumption Data of Smart Homes
Creators: name: Billah, Mustain
name: Anwar, Adnan
name: Rahman, Ziaur
name: Galib, Syed Md.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Cryptography and Security (cs.CR)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences
subject: H.1

description: Accurate building energy prediction is useful in various applications starting from building energy automation and management to optimal storage control. However, vulnerabilities should be considered when designing building energy prediction models, as intelligent attackers can deliberately influence the model performance using sophisticated attack models. These may consequently degrade the prediction accuracy, which may affect the efficiency and performance of the building energy management systems. In this paper, we investigate the impact of bi-level poisoning attacks on regression models of energy usage obtained from household appliances. Furthermore, an effective countermeasure against the poisoning attacks on the prediction model is proposed in this paper. Attacks and defenses are evaluated on a benchmark dataset. Experimental results show that an intelligent cyber-attacker can poison the prediction model to manipulate the decision. However, our proposed solution successfully ensures defense against such poisoning attacks effectively compared to other benchmark techniques.
description: 17 Pages, 7 Figures, 1 table
Unions of onions: preprocessing imprecise points for fast onion decomposition
Creators: name: Löffler, Maarten
name: Mulzer, Wolfgang
Publisher: name: Journal of Computational Geometry
Year: 2014

description: Let D be a set of n pairwise disjoint unit disks in the plane. We describe how to build a data structure for D so that for any point set P containing exactly one point from each disk, we can quickly find the onion decomposition (convex layers) of P. Our data structure can be built in O(n log n) time and has linear size. Given P, we can find its onion decomposition in O(nlog k) time, where k is the number of layers. We also provide a matching lower bound. Our solution is based on a recursive space decomposition, combined with a fast algorithm to compute the union of two disjoint onion decompositions.
description: Journal of Computational Geometry, Vol. 5 No. 1 (2014)
Bathymetry and Morphometric Analysis of Greek Natural Lakes through a hybrid GIS-acoustic methodology
Creators: name: Perivolioti, Triantafyllia-Maria
name: Apostolakis, Antonios
name: Papadimos, Dimitrios
name: Tsiaoussi, Vasiliki
Publisher: name: Taylor & Francis
Year: 2025
Subjects: subject: Environmental Sciences not elsewhere classified
subject: Ecology
subject: FOS: Biological sciences
subject: Biological Sciences not elsewhere classified
subject: Marine Biology
subject: Inorganic Chemistry
subject: FOS: Chemical sciences
subject: Science Policy

description: Homogenous and up-to-date bathymetric information of lakes is essential to improve limnological knowledge, and to produce evidence-based lake monitoring and assessment methods and river basin management plans according to Water Framework Directive (WFD). The present study focused on the production of updated bathymetric information of the main natural Greek lakes and their morphometric analysis. The aim was to address the knowledge gap by providing updated, homogeneous and accurate bathymetric information for the main freshwater natural lakes of Greece, as part of the National Monitoring Network of Lakes, in the context of WFD. Fourteen freshwater lakes in mainland Greece were surveyed using a dual frequency echosounder. Using the acoustic data, collected during the surveys, bathymetric digital terrain models (DTMs) were produced for each lake, and were used to estimate morphometric characteristics (mean/maximum depth, volume, lake depth ratio, volume development, mean lake diameter, relative depth ratio, shoreline development factor, hypsographic curve). This analysis demonstrated the potential of the morphometric approach to generate valuable information using up-to-date bathymetric DTMs. The geospatial data derived by the present study are available through an online repository [Greek National Monitoring Network of Lakes - http://ekbygis.biodiversity-info.gr/geoserver/web/]. They provide a valuable database for the advancement of limnological knowledge, the implementation of comprehensive monitoring programmes and informed decision making in water resources management.
Galaxy morphology in the LambdaCDM cosmology
Creators: name: Parry, O. H.
name: Eke, V. R.
name: Frenk, C. S.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We investigate the origins of galaxy morphology (defined by bulge-to-total K-band luminosity) in the LambdaCDM cosmology using two galaxy formation models ,based on the Millennium simulation, by Bower et al. (the Durham model) and De Lucia & Blaizot (the MPA model). There are many similarities, but also fundamental disagreements in the predictions of the two models for galaxy morphology. For example, taking into account uncertainties in the available observational data, both produce a realistic morphological mix today, but its evolution is very different. A main cause of this and other differences is the treatment of disk instabilities which play a more prominent role in the Durham model. Our analysis confirms previous theoretical predictions that elliptical galaxies form most of their stars before the bulk of the galaxy is assembled. Spirals tend to have later `assembly' times as a consequence of in-situ star formation. With the exception of the brightest ellipticals (stellar mass > 2.5e11 M_sun/h), we find that major mergers are not the primary mechanism by which most spheroids (ellipticals and spiral bulges) assemble their mass. In fact, the majority of ellipticals (and the overwhelming majority of spirals) never experience a major merger (above the resolution limit of our simulation.) Most ellipticals and spiral bulges acquire their stellar mass through minor mergers or disk instabilities. These conclusions are common to both models. The rotation properties of spheroids may help to constrain the importance of disk instabilities in these models.
description: Accepted for publication in MNRAS 15 pages, 8 figures Substantial revisions to original following referee's report