cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Commuting Differential Operators in Positive Characteristic
Creators: name: Desrochers, Justin
Publisher: name: Graduate Studies
Year: 2023
Subjects: subject: Algebra
subject: Differential Operators
subject: Reductive Groups
subject: Coalgebras
subject: Mathematics
subject: FOS: Mathematics

description: The centralizer of a noncentral element of the first Weyl algebra over a field is commutative. We discuss several proofs of this result, including a recent proof for positive characteristic fields. We also construct a large class of maximal commutative subalgebras, of the algebra differential operators on the affine line in positive characteristic. The later chapters are dedicated to the special linear group and its distribution algebra in positive characteristic. Several conjugation invariant distributions are demonstrated and their nilpotency is determined. Lastly we define a new product on the coordinate algebras of the Frobenius kernels, inspired by finding conjugation invariants.
A density-matrix renormalization group algorithm for simulating quantum circuits with a finite fidelity
Creators: name: Ayral, Thomas
name: Louvet, Thibaud
name: Zhou, Yiqing
name: Lambert, Cyprien
name: Stoudenmire, E. Miles
name: Waintal, Xavier
Publisher: name: arXiv
Year: 2022
Subjects: subject: Quantum Physics (quant-ph)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We develop a density-matrix renormalization group (DMRG) algorithm for the simulation of quantum circuits. This algorithm can be seen as the extension of time-dependent DMRG from the usual situation of hermitian Hamiltonian matrices to quantum circuits defined by unitary matrices. For small circuit depths, the technique is exact and equivalent to other matrix product state (MPS) based techniques. For larger depths, it becomes approximate in exchange for an exponential speed up in computational time. Like an actual quantum computer, the quality of the DMRG results is characterized by a finite fidelity. However, unlike a quantum computer, the fidelity depends strongly on the quantum circuit considered. For the most difficult possible circuit for this technique, the so-called "quantum supremacy" benchmark of Google Inc. , we find that the DMRG algorithm can generate bit strings of the same quality as the seminal Google experiment on a single computing core. For a more structured circuit used for combinatorial optimization (Quantum Approximate Optimization Algorithm or QAOA), we find a drastic improvement of the DMRG results with error rates dropping by a factor of 100 compared with random quantum circuits. Our results suggest that the current bottleneck of quantum computers is their fidelities rather than the number of qubits.
description: 25 pages, 13 figures. Review section updated
Stenomicra sylpha Grimaldi 2009, new species
Creators: name: Grimaldi, David A.
Publisher: name: Zenodo
Year: 2009
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Periscelididae
Stenomicra
Stenomicra sylpha

description: Stenomicra sylpha, new species Figures 4, 10 DIAGNOSIS: Body almost entirely light yellow, abdominal tergites I–IV slightly darker; frons white, pollinose. Wing hyaline. Pseudovibrissae stout, laterally flattened, slightly scalelike. Arista with 5 dorsal and 2 ventral branches. Best distinguished from similar yellow and light brown species by male terminalia: Each cercus with long, thick seta at apex of ventral margin; cercus anteriorly (underneath) with row of 7–8 short setae. Surstylus long, curved and arched, apically pointed, with very sparse setulae and microtrichia. Aedeagus short (without visible trunk), membranous, spiculed. TYPES: Holotype, male (not dissected), FIJI: Taveuni, Cakaudrove Prov., 5.3 km SE Tavuki Vlg. [Village], Mt. Devo, 1064 m, 3–20.XII.2002, Malaise 3. Coll. Schlinger, Tokota’a. 16.841 ° S, 179.968 ° W, FBA 153797. ThL 5 1.55 mm; Wing W /L 50.36; L r-m / L between r-m and m-cu 5 0.33. In BPBM. Paratypes: 1 male (no. 55 [150902] dissected), 5 females, all Taveuni: Cakaudrove, 5.6 km SE Tavuki Vlg., Mt. Devo, 892–1187 m, 30. VI – 14. VIII, 2004, Malaise 1, 3, 4; Schlinger and Tokota’a, 16.843 ° S, 179.966 ° W, FBA 149851, 149860, 150903, 151943, 154918, 154919. In BPBM and AMNH. Genitalia of the holotype are well displayed, confirming that this specimen and the dissected paratype are the same species. ETYMOLOGY: From the French, sylphe, meaning a fairylike spirit of the air, in reference to the pale body coloration of this little fly.
description: Published as part of Grimaldi, David A., 2009, The Asteioinea of Fiji (Insecta: Diptera: Periscelididae, Asteiidae, Xenasteiidae), pp. 1-60 in American Museum Novitates 3671 on page 6, DOI: 10.1206/685.1, http://zenodo.org/record/5358027
On the linearly polarized gluon distributions in the color dipole model
Creators: name: Dominguez, Fabio
name: Qiu, Jian-Wei
name: Xiao, Bo-Wen
name: Yuan, Feng
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We show that the linearly polarized gluon distributions appear in the color dipole model as we derive the full cross sections of the DIS dijet production and the Drell-Yan dijet ($γ^*$ jet correlation) process. Together with the normal Weizsäcker-Williams gluon distribution, the linearly polarized one will contribute to the DIS dijet production cross section as the coefficient of the $\cos(2 Δϕ) $ term in the correlation limit. We also derive the exact results for the cross section of the Drell-Yan dijet process, and find that the linearly polarized dipole gluon distribution which is identical to the normal dipole gluon distribution involves in the cross section. The results obtained in this paper agree with the previous transverse momentum dependent factorization study. We further derive the small-$x$ evolution of these linearly polarized gluon distributions and find that they rise as $x$ gets small at high energy.
description: 10 pages,v2 with minor revision
Forecasting COVID-19 spreading trough an ensemble of classical and machine learning models: Spain's case study
Creators: name: Cacha, Ignacio Heredia
name: Díaz, Judith Sainz-Pardo
name: Melguizo, María Castrillo
name: García, Álvaro López
Publisher: name: arXiv
Year: 2022
Subjects: subject: Machine Learning (cs.LG)
subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences

description: In this work we evaluate the applicability of an ensemble of population models and machine learning models to predict the near future evolution of the COVID-19 pandemic, with a particular use case in Spain. We rely solely in open and public datasets, fusing incidence, vaccination, human mobility and weather data to feed our machine learning models (Random Forest, Gradient Boosting, k-Nearest Neighbours and Kernel Ridge Regression). We use the incidence data to adjust classic population models (Gompertz, Logistic, Richards, Bertalanffy) in order to be able to better capture the trend of the data. We then ensemble these two families of models in order to obtain a more robust and accurate prediction. Furthermore, we have observed an improvement in the predictions obtained with machine learning models as we add new features (vaccines, mobility, climatic conditions), analyzing the importance of each of them using Shapley Additive Explanation values. As in any other modelling work, data and predictions quality have several limitations and therefore they must be seen from a critical standpoint, as we discuss in the text. Our work concludes that the ensemble use of these models improves the individual predictions (using only machine learning models or only population models) and can be applied, with caution, in cases when compartmental models cannot be utilized due to the lack of relevant data.
Security and Composability of Randomness Expansion from Bell Inequalities
Creators: name: Fehr, Serge
name: Gelles, Ran
name: Schaffner, Christian
Publisher: name: arXiv
Year: 2011
Subjects: subject: Quantum Physics (quant-ph)
subject: Cryptography and Security (cs.CR)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: The nonlocal behavior of quantum mechanics can be used to generate guaranteed fresh randomness from an untrusted device that consists of two nonsignalling components; since the generation process requires some initial fresh randomness to act as a catalyst, one also speaks of randomness expansion. Colbeck and Kent proposed the first method for generating randomness from untrusted devices, however, without providing a rigorous analysis. This was addressed subsequently by Pironio et al. [Nature 464 (2010)], who aimed at deriving a lower bound on the min-entropy of the data extracted from an untrusted device, based only on the observed non-local behavior of the device. Although that article succeeded in developing important tools towards the acquired goal, it failed in putting the tools together in a rigorous and correct way, and the given formal claim on the guaranteed amount of min-entropy needs to be revisited. In this paper we show how to combine the tools provided by Pironio et al., as to obtain a meaningful and correct lower bound on the min-entropy of the data produced by an untrusted device, based on the observed non-local behavior of the device. Our main result confirms the essence of the improperly formulated claims of Pironio et al., and puts them on solid ground. We also address the question of composability and show that different untrusted devices can be composed in an alternating manner under the assumption that they are not entangled. This enables for superpolynomial randomness expansion based on two untrusted yet unentangled devices.
description: 12 pages, v3: significant changes: security is proven against adversaries holding only classical side information
Inclusive b-jet and b\bar b-dijet production at the LHC via Reggeized gluons
Creators: name: Saleev, Vladimir
name: Shipilova, Alexandra
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We study inclusive $b$-jet and $b\bar b$-dijet production at the CERN LHC invoking the hypothesis of gluon Reggeization in $t$-channel exchanges at high energy. The $b$-jet cross section includes contributions from open $b$-quark production and from $b$-quark production via gluon-to-bottom-pair fragmentation. The transverse-momentum distributions of inclusive $b$-jet production measured with the ATLAS detector at the CERN LHC in different rapidity ranges are calculated both within multi-Regge kinematics and quasi-multi-Regge kinematics. The $b\bar b$-dijet cross-section is calculated within quasi-multi-Regge kinematics as a function of the dijet invariant mass $M_{jj}$, the azimuthal angle between the two jets $Δϕ$ and the angular variable $χ$. At the numerical calculation, we adopt the Kimber-Martin-Ryskin and Blümlein prescriptions to derive unintegrated gluon distribution function of the proton from its collinear counterpart, for which we use the Martin-Roberts-Stirling-Thorne set. We find good agreement with measurements by the ATLAS and CMS Collaborations at the LHC at the hadronic c.m.\ energy of $\sqrt S=7$ TeV.
description: 13 pages, 9 figures
Deconstructing Colonial Conceptions: The St. Paul Industrial Boarding School Report of 1896
Creators: name: Wilde, Nathan Grant
Publisher: name: Graduate Studies
Year: 2023
Subjects: subject: Discipline
subject: Religion
subject: Play
subject: Foucault
subject: Said
subject: Contrapuntal reading
subject: Department of Indian Affairs
subject: Annual report
subject: Programme of Studies for Indian Schools
subject: Indigenous
subject: Colonialism
subject: Residential schools
subject: 1896
subject: Summerhill
subject: Normalizing power
subject: Genealogy
subject: Surveillance
subject: Ten Commandments
subject: Ideological perceptions
subject: Decolonization in Canada
subject: St. Paul industrial boarding school
subject: Edward F. Hockley
subject: Reconciliation
subject: Context of perception
subject: Childhood
subject: Education
subject: Education--History of
subject: History--Canadian
subject: Native American Studies

description: In 1896, acting principal Edward F. Hockley of St. Paul industrial boarding school, submitted his annual report to the Department of Indian Affairs (DIA). In it he informed the Department regarding the day-to-day operations of the school. This thesis bases its analysis on Hockley’s 1896 report. Along with the centrality of Hockley’s report as a primary source for this study, the thesis is structured by analysis of a normalized perception of education, arising from the standardized curricular document used to govern industrial and later residential schools, titled the “Programme of Studies for Indian Schools.” The Programme, and the reports that insisted on its adherence (like that from Hockley), reveals a colonial ideology that was highly hierarchized and normalized. As this thesis demonstrates, Hockley’s report provides a clear window into historical Western conceptions of education, which shaped his perceptions as written. These conceptions were historically contingent, ideologically driven, and largely centred on Western (colonial) views of childhood. To reveal this, the thesis draws three themes from Hockley’s report which, in turn, shape its three chapters: discipline, religion, and play. By studying Hockley’s discussion of these matters, as reflected by his report on St. Paul, wider historical influences are demonstrated, which shaped, informed, proliferated and importantly, authenticated his perceptions of play, discipline, and religion, both for himself and for his superiors as being “normal.” In so doing, the thesis takes inspiration from the works of Michel Foucault and draws on Edward Said’s contrapuntal method of analysis.
Confining complex ghost degrees of freedom
Creators: name: Frasca, Marco
name: Ghoshal, Anish
name: Koshelev, Alexey S.
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We show a theorem proving that a non-local bosonic field upon a covariant interaction with a confining gauge field undergoes the confinement of its degrees of freedom present in the free theory changing completely the physical mass spectrum following Kugo-Ojima criterion. This is applicable to an infinite number of excitations of the bosonic field including ghosts whereas we pay special attention to the modes with the complex conjugate masses, states appearing in the string field theory motivated infinite-derivative models. The same recipe will obviously work for the Lee-Wick models.
description: 9 pages, no figures. Version accepted for publication in Physics Letters B
Parity-encoding-based quantum computing with Bayesian error tracking
Creators: name: Lee, Seok-Hyung
name: Omkar, Srikrishna
name: Teo, Yong Siah
name: Jeong, Hyunseok
Publisher: name: arXiv
Year: 2022
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Measurement-based quantum computing (MBQC) in linear optical systems is promising for near-future quantum computing architecture. However, the nondeterministic nature of entangling operations and photon losses hinder the large-scale generation of graph states and introduce logical errors. In this work, we propose a linear optical topological MBQC protocol employing multiphoton qubits based on the parity encoding, which turns out to be highly photon-loss tolerant and resource-efficient even under the effects of nonideal entangling operations that unavoidably corrupt nearby qubits. For the realistic error analysis, we introduce a Bayesian methodology, in conjunction with the stabilizer formalism, to track errors caused by such detrimental effects. We additionally suggest a graph-theoretical optimization scheme for the process of constructing an arbitrary graph state, which greatly reduces its resource overhead. Notably, we show that our protocol is advantageous over several other existing approaches in terms of fault-tolerance, resource overhead, or feasibility of basic elements.
description: Main text: 15 pages, 10 figures / Supplemental Material: 17 pages, 8 figures
Optimization of the Collection Efficiency of a Hexagonal Light Collector using Quadratic and Cubic Bézier Curves
Creators: name: Okumura, Akira
Publisher: name: arXiv
Year: 2012
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: Reflective light collectors with hexagonal entrance and exit apertures are frequently used in front of the focal-plane camera of a very-high-energy gamma-ray telescope to increase the collection efficiency of atmospheric Cherenkov photons and reduce the night-sky background entering at large incident angles. The shape of a hexagonal light collector is usually based on Winston's design, which is optimized for only two-dimensional optical systems. However, it is not known whether a hexagonal Winston cone is optimal for the real three-dimensional optical systems of gamma-ray telescopes. For the first time we optimize the shape of a hexagonal light collector using quadratic and cubic Bézier curves. We demonstrate that our optimized designs simultaneously achieve a higher collection efficiency and background reduction rate than traditional designs.
description: 9 pages, 9 figures
Exact Form-Factor Results for the Longitudinal Structure Factor of the Massless XXZ Model in Zero Field
Creators: name: Caux, J. -S.
name: Konno, H.
name: Sorrell, M.
name: Weston, R.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: We consider the XXZ quantum spin chain in its massless, disordered regime at zero field. We derive an exact expression for the two-spinon form-factor of $S^z=1/2σ^z$ by taking a limit of the massive XYZ form-factors found by Lashkevich and by Lukyanov and Terras. This result is used to find the two-spinon contribution to the spectral decomposition of the longitudinal structure factor $S^{zz}(k,w)$. We find that this contribution provides an accurate approximation to the full structure factor over a wide range of the anisotropy parameter. The asymptotic behaviour of $S^{zz}(k,w)$ is computed as the upper and lower $w$ thresholds of the two-spinon $(w,k)$ band are approached, and an analysis of the region of validity of this threshold behaviour is performed. Our results reproduce and refine existing threshold behaviour predictions and extend these results to an accurate description throughout the two-spinon continuum.
description: 39 pages, 10 figures, dedicated to Prof. M. Jimbo
Stenomicra xoutha Grimaldi 2009, new species
Creators: name: Grimaldi, David A.
Publisher: name: Zenodo
Year: 2009
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Periscelididae
Stenomicra
Stenomicra xoutha

description: Stenomicra xoutha, new species Figures 4, 11 DIAGNOSIS: Frons whitish, pollinose; scutum and scutellum very light brown/dark ochre, lighter (yellow) between dorsocentrals; tergites I–IV light brown. Dorsal portion of pleura light brown. Pair of anterior frontoorbital setae minute, very light and barely detectable. Arista with 4 dorsal and 2 dorsal branches. Wing hyaline. Best distinguished from similar Stenomicra by male terminalia: cerci without pair of long, thick setae on ventroapical margins; aedeagus curved, apex brushlike; surstylus curved, apex acute, base broad and with dense, long setulae on inner margin. TYPES: Holotype, male (dissected, no. 56), FIJI: Viti Levu: Naitasiri Prov., Nakobalevu Mt., FJ-4, 22.IX–9.X.02, 178 ° 259E, 18 ° 039S, rainforest, M. Irwin, E. Schlinger, M. Tokota’a, Malaise trap 340 m., FBA 013231. ThL 5 1.32 mm; wing W/L 5 0.40; L r-m / L between r-m and m-cu L r-m / L between r-m and m-cu 5 0.33. In BPBM. In addition, there is a series of seven females that are tentatively being assigned to S. xoutha, on the basis of coloration, minute frontoorbitals, and aristal branches. Four females are from the type locality (Nakobalevu, 2 collected at 340 m, other 2 not specified: nos. FBA013232, 013233, 210864, 210865). A further two females are also from Viti Levu, Naitasiri Prov.: 1 female 3.2 km E Navsi Vlg., Veilaselase Track, 1020 m, 19.IV–14.V.2004, Malaise 2, Schlinger, Tokota’a, 17.624 ° S, 178.009 ° E, FBA 155656. 1 female: Naitasiri Prov., Eteni, Navai, Malaise trap, 6.VI–15.VII.2003, FJ-11B, 700 m, E. Schlinger, M. Irwin, M. Tokota’a, 177 ° 599E, 17 ° 379S, FBA013857. Lastly, there are two females from two other islands that are similar to the above females. 1 female: Vanua Levu, Bua Prov., Batiqere Range, 6 km NW Kilaka Village, 98 m, 15– 24.VI.2004, Malaise 5, Schlinger and Tokota’a. 16.807 ° S, 178.991 ° E, FBA161196. 1 female: Taveuni, Cakadrove Prov. Devo Peak Radio Tower, Malaise in rainforest, 10.X–17.X.02, FJ-8, M. Irwin, E. Schlinger, M. Tokota’a, 179 ° 589E, 16 ° 519S, 1200 m, FBA018304. ETYMOLOGY: From the Greek, xouthos, meaning yellowish brown, in reference to the color of the scutum and scutellum.
description: Published as part of Grimaldi, David A., 2009, The Asteioinea of Fiji (Insecta: Diptera: Periscelididae, Asteiidae, Xenasteiidae), pp. 1-60 in American Museum Novitates 3671 on page 17, DOI: 10.1206/685.1, http://zenodo.org/record/5358027
The roles of CREB, CaMK1 and ageing in short- and long-term tap habituation in Caenorhabditis elegans
Creators: name: Timbers, Tiffany-Anne
Publisher: name: University of British Columbia
Year: 2012

description: Changes in synaptic connections and neural excitability are thought to mechanistically underlie learning and memory. This dissertation further extends our understanding of the processes governing learning and memory through experimental studies of short- and long-term habituation to mechanical (tap) stimuli in the nematode Caenorhabditis elegans. I investigated the role of the C. elegans CREB homologue, crh-1, in response to tap habituation. crh-1 mutants performed smaller reversals in response to tap than did wild-type worms and did not show long-term habituation; however, short-term habituation was normal. Expressing CRH-1 in a subset of interneurons of the tap withdrawal circuit rescued the long-term habituation defects observed in crh-1 mutants: demonstrating for the first time that CREB is required for long-term habituation and that the reversal interneurons are the locus of plasticity for long-term tap habituation in C. elegans. To test whether CaMK1 functioned in learning in vivo I tested if strains of C. elegans with mutations in the CaMK1 homologue, cmk-1, and its upstream activating kinase, CaMKK, (ckk-1 in C. elegans) could habituate to tap. cmk-1 but not ckk-1 mutants performed larger reversals in response to tap and did not habituate as deeply as wild-type worms. This is the first demonstration that CAMK1 is required for learning. An analysis of 46 worm strains with mutations in genes predicted by the literature and/or bioinformatics to be targets of phosphorylation by CaMK1 identified 4 strains that ranged from partial to full phenocopy of mutations in cmk-1, suggesting that they may function in the same pathway as CaMK1 in learning. I also performed a large parametric behavioural study of tap habituation over a range of intensities in ageing worms. As worms age from 72 to 120 hrs post-egg lay response probability habituation increased. These age-related changes were reflected by the worms’ decreasing capacity to show behavioural discrimination of stimulus intensity as they aged. Optogenetics experiments suggested that the age-dependent changes occur upstream of depolarization of the mechanosensory neurons. These findings increase our knowledge of the mechanisms that govern habituation and open new doors for further research in this area.
Shear viscosity and spin diffusion coefficient of a two-dimensional Fermi gas
Creators: name: Bruun, G. M.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: Using kinetic theory, we calculate the shear viscosity and the spin diffusion coefficient as well as the associated relaxation times for a two-component Fermi gas in two dimensions, as a function of temperature, coupling strength, polarization, and mass ratio of the two components. It is demonstrated that the minimum value of the viscosity decreases with the mass ratio, since Fermi blocking becomes less efficient. We furthermore analyze recent experimental results for the quadrupole mode of a 2D gas in terms of viscous damping obtaining a qualitative agreement using no fitting parameters.
description: 5 pages, 5 figures. Typos corrected and minor changes to the text in version 2
Characterization of Ionosphere-Thermosphere Coupling from the VISIONS-2 Mission
Creators: name: Wilson, Kieran
Publisher: name: Graduate Studies
Year: 2023
Subjects: subject: VISIONS-2
subject: Ionosphere-Thermosphere Coupling
subject: Electrostatic Analyzer
subject: Sounding Rocket
subject: Ion Drift
subject: Neutral Wind
subject: Electricity and Magnetism
subject: Geophysics
subject: FOS: Earth and related environmental sciences
subject: Atmospheric Science
subject: Fluid and Plasma

description: VISIONS-2 was a NASA sounding rocket mission consisting of two payloads flown on December 7th, 2018 from Svalbard, Norway. On board the first Visions-2 payload, electrostatic analyzers gathered data on low-energy ions throughout the flight. Existing in situ studies of the mechanics of ionosphere-thermosphere coupling within the undersampled E-region are limited. The present study aims to bolster these existing findings by characterizing the transition from collisionless to collision-dominated ionosphere-thermosphere interaction peaking near 120 km altitude, estimating the altitude at which friction balances the Lorentz force on ionospheric ions. For the purposes of this study, ion drift is estimated at regular altitude intervals throughout the transition region using two-dimensional images gathered by the electrostatic analyzers. In the absence of thermospheric wind measurements and low-altitude electric field measurements, the ion drift variation with altitude is used as a proxy measurement for neutral winds and the guiding centre drift. This approach prohibits the direct exploration of the effects of payload potential or ion species on the measured ion velocity. Study results place the collisional transition height below 120 km, corroborating previous research that constrains the collisional transition height, during quiet conditions, between 110 – 120 km.
A subwavelength atomic array switched by a single Rydberg atom
Creators: name: Srakaew, Kritsana
name: Weckesser, Pascal
name: Hollerith, Simon
name: Wei, David
name: Adler, Daniel
name: Bloch, Immanuel
name: Zeiher, Johannes
Publisher: name: arXiv
Year: 2022
Subjects: subject: Quantum Physics (quant-ph)
subject: Quantum Gases (cond-mat.quant-gas)
subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: Enhancing light-matter coupling at the level of single quanta is essential for numerous applications in quantum science. The cooperative optical response of subwavelength atomic arrays has been found to open new pathways for such strong light-matter couplings, while simultaneously offering access to multiple spatial modes of the light field. Efficient single-mode free-space coupling to such arrays has been reported, but the spatial control over the modes of outgoing light fields has remained elusive. Here, we demonstrate such spatial control over the optical response of an atomically thin mirror formed by a subwavelength array of atoms in free space using a single controlled ancilla atom excited to a Rydberg state. The switching behavior is controlled by the admixture of a small Rydberg fraction to the atomic mirror, and consequently strong dipolar Rydberg interactions with the ancilla. Driving Rabi oscillations on the ancilla atom, we demonstrate coherent control of the transmission and reflection of the array. These results represent a step towards the realization of quantum coherent metasurfaces, the demonstration of controlled atom-photon entanglement and deterministic engineering of quantum states of light.
description: 8 pages, 5 figures + 9 pages Supplementary Information
Nanomaterial safety data integration with eNanoMapper database
Creators: name: Jeliazkova, Nina
name: Kochev, Nikolay
name: Paskaleva, Vesselina
name: Tancheva, Gergana
name: Nymark, Penny
name: Apostolova, Margarita
name: Haase, Andrea
Publisher: name: Zenodo
Year: 2018
Subjects: nanosafety, database, substance ,nanomaterials, enanomapper

description: We present experience with integrating large sets of nanosafety data generated from past NanoSafety Cluster projects with the help of a substance data model (Figure 1), implemented by the eNanoMapper database software [1]. This data model is also successfully used to handle chemical substances and safety data from ECHA dossiers [2].

•While multiple structured import formats are supported (IUCLID, RDF, JSON), the nanosafety data from past and ongoing projects use custom spreadsheet templates, currently encompassing over 1000 Excel files. Import of Excel files is enabled by a configurable parser that maps the spreadsheet data via external configuration files. Multiple export formats are supported, including tab delimited files, RDF and ISA-JSON.

•The eNanoMapper ontology[3] is used for harmonisation of the terminology and as a synonym list for query expansion.
description: {"references": ["Jeliazkova, N.; Chomenidis, C.; Doganis, P.; Fadeel, B.; Grafstr\u00f6m, R.; Hardy, B.; Hastings, J.; Hegi, M.; Jeliazkov, V.; Kochev, N.; Kohonen, P.; Munteanu, C. R.; Sarimveis, H.; Smeets, B.; Sopasakis, P.; Tsiliki, G.; Vorgrimmler, D.; Willighagen, E. Beilstein J. Nanotechnol. 2015, 6, 1609\u20131634.", "Jeliazkova, N.; Koch, V.; Li, Q.; Jensch, U.; Reigl, J. S.; Kreiling, R.; Georgiev, I.; Hubesch, B. Toxicol. Lett. 2016, 258, S114\u2013S115.", "Hastings, J.; Jeliazkova, N.; Owen, G.; Tsiliki, G.; Munteanu, C. R.; Steinbeck, C.; Willighagen, E. J. Biomed. Semantics 2015, 6 (1), 10."]}
Magnetic field, differential rotation and activity of the hot-Jupiter hosting star HD 179949
Creators: name: Fares, R.
name: Donati, J. -F.
name: Moutou, C.
name: Jardine, M.
name: Cameron, A. C.
name: Lanza, A.
name: Bohlender, D.
name: Dieters, S.
name: Fiorenzano, A. Martinez
name: Maggio, A.
name: Pagano, I
name: Shkolnik, E. L.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: HD 179949 is an F8V star, orbited by a giant planet at ~8 R* every 3.092514 days. The system was reported to undergo episodes of stellar activity enhancement modulated by the orbital period, interpreted as caused by Star-Planet Interactions (SPIs). One possible cause of SPIs is the large-scale magnetic field of the host star in which the close-in giant planet orbits. In this paper we present spectropolarimetric observations of HD 179949 during two observing campaigns (2009 September and 2007 June). We detect a weak large-scale magnetic field of a few Gauss at the surface of the star. The field configuration is mainly poloidal at both observing epochs. The star is found to rotate differentially, with a surface rotation shear of dOmega=0.216\pm0.061 rad/d, corresponding to equatorial and polar rotation periods of 7.62\pm0.07 and 10.3\pm0.8 d respectively. The coronal field estimated by extrapolating the surface maps resembles a dipole tilted at ~70 degrees. We also find that the chromospheric activity of HD 179949 is mainly modulated by the rotation of the star, with two clear maxima per rotation period as expected from a highly tilted magnetosphere. In September 2009, we find that the activity of HD 179949 shows hints of low amplitude fluctuations with a period close to the beat period of the system.
description: Accepted for publication in Monthly Notices of The Royal Astronomical Society
Three Essays on Assortment Planning in Omni-Channel Retail Supply Chains
Creators: name: Aslani, Amin
Publisher: name: Haskayne School of Business
Year: 2023
Subjects: subject: Assortment Planning, Omni-Channel Retail, Supply Chain Management, Coordination, Information Asymmetry
subject: Business Administration--Management
subject: Engineering--Operations Research
subject: Education--Business

description: In omni-channel retail systems, comprising an online sales website and brick-and-mortar (physical) stores, a physical store typically faces limited shelf-space capacity, while capacity is not an issue for the online channel. Consequently, a crucial aspect of such retail systems is to choose a subset of products present online for showcasing in the physical store (i.e., assortment planning). In my first research stream, I investigate the omni-channel assortment problem when product returns are allowed. Assortment decisions influence product returns, as showcased products provide information to online shoppers who visit the physical store. Therefore, although product returns can be a factor for profit loss, effective assortment planning can mitigate the returns’ adverse impact and optimize profitability. My results indicate that even with sufficient capacity, showcasing all products in the physical store may not be optimal. Additionally, retailers generally fare better when customers undervalue hidden attribute levels. In my second research stream, I explore a decentralized retail supply chain (RSC) comprising an online channel managed by a manufacturer setting wholesale prices, and an independent retailer managing the physical store and making assortment decisions. As a benchmark, I examine a centralized setting where both channels are under a central authority aiming to maximize overall profit. My findings show fundamental differences in optimal centralized and decentralized assortments, indicating inefficiency in the decentralized approach. I propose scope contracts for coordination, wherein the manufacturer offers discounts on wholesale prices for products with specific attribute levels, incentivizing the retailer to adopt the centralized assortment. The scope contracts ensure both parties' profitability and coordinate the RSC. In the third stream, I suppose that the magnitude of inaccuracy in online assessment of products due to the lack of physical encounter is unknown to the RSC parties, and they make decisions with asymmetric information. I investigate the assortment and wholesale price decisions along with profit regrets. My findings under the decentralized setting indicate that while both parties cannot fare better simultaneously, each party can be advantaged under certain conditions. Under the centralized setting, when supposing accurate online assessments, showcasing an assortment of the highest utility attribute levels possibly minimizes system-wide regret.
Indirect dark matter searches: towards a consistent top-bottom approach for studying the gamma-ray signals and associated backgrounds
Creators: name: Nezri, Emmanuel
name: Lavalle, Julien
name: Teyssier, Romain
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: While dark matter (DM) is the key ingredient for a successful theory of structure formation, its microscopic nature remains elusive. Indirect detection may provide a powerful test for some strongly motivated DM particle models. Nevertheless, astrophysical backgrounds are usually expected with amplitudes and spectral features similar to the chased signals. On galactic scales, these backgrounds arise from interactions of cosmic rays (CRs) with the interstellar gas, both being difficult to infer and model in detail from observations. Moreover, the associated predictions unavoidably come with theoretical errors, which are known to be significant. We show that a trustworthy guide for such challenging searches can be obtained by exploiting the full information contained in cosmological simulations of galaxies, which now include baryonic gas dynamics and star formation. We further insert CR production and transport from the identified supernova events and fully calculate the CR distribution in a simulated galaxy. We focus on diffuse gamma-rays, and self-consistently calculate both the astrophysical galactic emission and the dark matter signal. We notably show that adiabatic contraction does not necessarily induce large signal-to-noise ratios in galactic centers, and could anyway be traced from the astrophysical background itself. We finally discuss how all this may be used as a generic diagnostic tool for galaxy formation.
description: 6 pages, 3 figures. V2: minor changes to match the published version
title: Writing With words that don’t exist
Creators: name: Powell, Olivia
Publisher: name: The Digital Review
Year: 2021

description: With words that don’t exist has been my attempt to access and articulate this story through imaginative writing spaces in Virtual Reality. In creating and moving through virtual spaces for writing and editing, I investigate how VR’s affordances for embodied and spatial engagement support, or disrupt, the kind of writing—at once physical and virtual, archival and performative—demanded by this story by the sea. Importantly, the ‘outcome’ of With words is not a VR rendering of a story. Rather, the work subverts expected uses of such technologies and reimagines VR as a space for developing narratives that maybe can’t be told, only held.
Cyamops fiji Baptista and Mathis
Creators: name: Grimaldi, David A.
Publisher: name: Zenodo
Year: 2009
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Periscelididae
Cyamops
Cyamops fiji

description: Cyamops fiji Baptista and Mathis Figures 1, 2, 15 C. fiji Baptista and Mathis, 2000: 493. DIAGNOSIS: Separated from other species of the genus as based on details of male terminalia and female described in Baptista and Mathis (2000): unique shape of right surstylus, sternites VI+VII incompletely fused, 4 spermathecae. Also: peristomal setae on face, face with slight vertical ridge; arista without bifurcate branches; distal halves of femora dark brown; forefemur without ctenidium; mesocoxa without comb of setae; male terminalia with left surstylus short, length 3.3X greatest width, as figured. DESCRIPTION: A detailed description is provided in Baptista and Mathis (2000). MATERIAL EXAMINED: According to the original description, 18 males and 18 females were collected by N.H.L. Krauss, March 1981 on Viti Levu, 0–200 m, in Lami (immediately west of Suva). Several specimens from the type series were examined for this study. Other specimens examined: Viti Levu: Nakobalevu Mtn., 12. III –24. III.03, 340 m, FJ40D, Irwin, Schlinger, Tokota’a (1 male, dissected: no. 61); ibid. FJ-40 FBA026387 (1 male). Naitasiri Prov., 4.8 km N Veisari Stlmt., log rd to Waivudawa, 300 m, 12.XI–3.I.03, Malaise 1, Schlinger and Tokota’a, 18.075 ° S, 178.362 ° E, FBA 178241 (1 male); Naitasiri Prov., Nakabalevu logging road, 17.III– 9.IV.2003, Malaise trap no. 1, E. Schlinger and M. Tokota’a, FBA210869 (male).
description: Published as part of Grimaldi, David A., 2009, The Asteioinea of Fiji (Insecta: Diptera: Periscelididae, Asteiidae, Xenasteiidae), pp. 1-60 in American Museum Novitates 3671 on page 23, DOI: 10.1206/685.1, http://zenodo.org/record/5358027
description: {"references": ["Baptista, A. R., and W. N. Mathis. 2000. Notes on the genus Cyamops Melander (Diptera: Periscelididae), including description of ten new species. Proceedings of the Entomological Society of Washington 102: 481 - 506."]}
Practical flux-prescriptions for gamma-ray burst afterglows, from early to late times
Creators: name: Leventis, Konstantinos
name: van Eerten, Hendrik J.
name: Meliani, Zakaria
name: Wijers, Ralph A. M. J.
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We present analytic flux prescriptions for broadband spectra of self-absorbed and optically thin synchrotron radiation from gamma-ray burst afterglows, based on one-dimensional relativistic hydrodynamic simulations. By treating the evolution of critical spectrum parameters as a power-law break between the ultrarelativistic and non-relativistic asymptotic solutions, we generalize the prescriptions to any observer time. Our aim is to provide a set of formulas that constitutes a useful tool for accurate fitting of model-parameters to observational data, regardless of the dynamical phase of the outflow. The applicability range is not confined to gamma-ray burst afterglows, but includes all spherical outflows (also jets before the jet-break) that produce synchrotron radiation as they adiabatically decelerate in a cold, power-law medium. We test the accuracy of the prescriptions and show that numerical evidence suggests that typical relative errors in the derivation of physical quantities are about 10 per cent. A software implementation of the presented flux prescriptions combined with a fitting code is freely available on request and on-line. Together they can be used in order to directly fit model parameters to data.
description: 17 pages, 10 figures, submitted to MNRAS
Variations of gwistor space
Creators: name: Albuquerque, Rui
Publisher: name: arXiv
Year: 2011
Subjects: subject: Differential Geometry (math.DG)
subject: FOS: Mathematics
subject: 53C10, 53C20, 53C25 (Primary), 53C28 (Secondary)

description: We study natural variations of the G2 structure σ_0 \in Λ^3_+ existing on the unit tangent sphere bundle SM of any oriented Riemannian 4-manifold M. We find a circle of structures for which the induced metric is the usual one, the so-called Sasaki metric, and prove how the original structure has a preferred role in the theory. We deduce the equations of calibration and cocalibration, as well as those of W3 pure type and nearly-parallel type.
description: 16 pages
Offline and Online Interactive Frameworks for MRI and CT Image Analysis in the Healthcare Domain : The Case of COVID-19, Brain Tumors and Pancreatic Tumors
Creators: name: Sailunaz, Kashfia
Publisher: name: Graduate Studies
Year: 2023
Subjects: subject: Education--Health
subject: Education--Technology
subject: Computer Science

description: Medical imaging represents the organs, tissues and structures underneath the outer layers of skin and bones etc. and stores information on normal anatomical structures for abnormality detection and diagnosis. In this thesis, tools and techniques are used to automate the analysis of medical images, emphasizing the detection of brain tumor anomalies from brain MRIs, Covid infections from lung CT images and pancreatic tumor from pancreatic CT images. Image processing methods such as filtering and thresholding models, geometry models, graph models, region-based analysis, connected component analysis, machine learning models, and recent deep learning models are used. The following problems for medical images : abnormality detection, abnormal region segmentation, interactive user interface to represent the results of detection and segmentation while receiving feedbacks from healthcare professionals to improve the analysis procedure, and finally report generation, are considered in this research. Complete interactive systems containing conventional models, machine learning, and deep learning methods for different types of medical abnormalities have been proposed and developed in this thesis. The experimental results show promising outcomes that has led to the incorporation of the methods for the proposed solutions based on the observations of the performance metrics and their comparisons. Although currently separate systems have been developed for brain tumor, Covid and pancreatic cancer, the success of the developed systems show a promising potential to combine them to form a generalized system for analyzing medical imaging of different types collected from any organs to detect any type of abnormalities.
Density functional for ternary non-additive hard sphere mixtures
Creators: name: Schmidt, Matthias
Publisher: name: arXiv
Year: 2011
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Based on fundamental measure theory, a Helmholtz free energy density functional for three-component mixtures of hard spheres with general, non-additive interaction distances is constructed. The functional constitutes a generalization of the previously given theory for binary non-additive mixtures. The diagrammatic structure of the spatial integrals in both functionals is of star-like (or tree-like) topology. The ternary diagrams possess a higher degree of complexity than the binary diagrams. Results for partial pair correlation functions, obtained via the Ornstein-Zernike route from the second functional derivatives of the excess free energy functional, agree well with Monte Carlo simulation data.
description: 6 pages, 4 figures
O'ZBEKISTONNING EKSPORT SALOHIYATINI OSHIRISHNING HUQUQIY ASOSLARI
Creators: name: Ismailova, Munisa
name: Daniyorova, Shahnoza
Publisher: name: Zenodo
Year: 2023

description: Bugungi kunda mamlakatimizda iqtisodiy hududlar va kichik sanoat zonalari tashkil etishga alohida e'tibor berilmoqda. Tashkil etilayotgan iqtisodiy hududlardan ko'zlangan muhim maqsadlardan biri hududninh eksport salohiyatini oshirish.Iqtisodiy hududlar eksport salohiyatini baholash va eksport salohiyatlarini oshirish masalasida markuz maqolada o'z aksini topgan.
Development of a Drilling Simulator to Achieve Drilling Optimization
Creators: name: Etaje, Darlington Christian
Publisher: name: Graduate Studies
Year: 2023
Subjects: subject: Drilling
subject: Simulation
subject: Finite Element
subject: Particle Swarm Optimization
subject: Engineering--Petroleum

description: In summary, drilling simulation, a set of physic-based models run through time or depth steps to mirror events in the drilling rig, is the backbone of all field testing of technologies or procedures. If a model has been validated using drilling simulation, the risk of wasted field trial is lowered significantly. This is why the formulation of models that make up drilling simulation is key and this is what this thesis has focused on. 20 functions were used to simulate the processes described in this research. Finite element formulation of space models linked with time-based models have been developed for the 2-node system in X (axial loading and axial torsion), Y (transverse bending of Z), and Z (transverse bending of Y) directions. Laplace transform was used to solve the time based partial differential equation paving way for the development of velocity, acceleration, force, and torque equations. Drill ahead modeling using build and walk relation to resultant forces was validated. Stick slip mitigation using the optimized RPM objective function was used to optimize the mechanical efficiency of drilling. Particle swarm optimization was the process used for optimization where each solution is considered a particle in search of the global minimum. An expression of the optimized RPM was developed and simulated with field data. Confined compressive strength of the field data was compared with the CCS obtained from the simulation but there was no perfect match yet. Further runs of the simulation would show more lessons as to how to improve the results. It can be concluded that the MSE minimization process should rather be called MSE optimization process as the decision to raise or lower MSE should be based on the data supplied to the particle swarm optimizer since the objective function is built with constraints to lower drill string vibrations. When tested with field data, the objective function and optimizer built in this research was found to increase MSE but lower the downhole stick slip index by 28 percent. The downhole stick slip index was below 0.5.