cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Abundance Analysis of Planetary Host Stars I. Differential Iron Abundances
Creators: name: Heiter, U.
name: Luck, R. E.
Publisher: name: arXiv
Year: 2003
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present atmospheric parameters and iron abundances derived from high-resolution spectra for three samples of dwarf stars: stars which are known to host close-in giant planets (CGP), stars for which radial velocity data exclude the presence of a close-in giant planetary companion (no-CGP), as well as a random sample of dwarfs with a spectral type and magnitude distribution similar to that of the planetary host stars (control). All stars have been observed with the same instrument and have been analyzed using the same model atmospheres, atomic data and equivalent width modeling program. Abundances have been derived differentially to the Sun, using a solar spectrum obtained with Callisto as the reflector with the same instrumentation. We find that the iron abundances of CGP dwarfs are on average by 0.22 dex greater than that of no-CGP dwarfs. The iron abundance distributions of both the CGP and no-CGP dwarfs are different than that of the control dwarfs, while the combined iron abundances have a distribution which is very similar to that of the control dwarfs. All four samples (CGP, no-CGP, combined, control) have different effective temperature distributions. We show that metal enrichment occurs only for CGP dwarfs with temperatures just below solar and approximately 300 K higher than solar, whereas the abundance difference is insignificant at Teff around 6000 K.
description: 52 pages (aastex 11pt, preprint style), including 17 figures and 13 tables; accepted for publication in AJ (scheduled for the October 2003 issue)
A note on bounded entropies
Creators: name: Amblard, Pierre-Olivier
name: Vignat, Christophe
Publisher: name: arXiv
Year: 2005
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: The aim of the paper is to study the link between non additivity of some entropies and their boundedness. We propose an axiomatic construction of the entropy relying on the fact that entropy belongs to a group isomorphic to the usual additive group. This allows to show that the entropies that are additive with respect to the addition of the group for independent random variables are nonlinear transforms of the Rényi entropies, including the particular case of the Shannon entropy. As a particular example, we study as a group a bounded interval in which the addition is a generalization of the addition of velocities in special relativity. We show that Tsallis-Havrda-Charvat entropy is included in the family of entropies we define. Finally, a link is made between the approach developed in the paper and the theory of deformed logarithms.
description: 10 pages, 1 figure
The effects of capital and liquidity regulations on banks
Creators: name: Xue, Yan
Publisher: name: No Publisher Supplied
Year: 2021

description: This dissertation includes three essays on Basel III. Basel III is considered as the most comprehensive set of regulations for mitigating banks' credit risk and market risk. Its major function is to encourage banks to raise more capital and carry sufficient liquid assets to avoid bank runs and defend against financial crises, thus promoting the stability of the financial system and maximizing the social warfare. Although stricter capital and liquidity requirements reduce the risk of bank runs, a voice of opposition about the negative impact of the regulations on banks' lending and profitability exists all the time. Finance researchers have conducted a number of theoretical and empirical studies to investigate how rigorous regulations affect the banks' risk and performance. The first essay in this dissertation summarizes this growing literature and sheds light on the future research areas on how capital and liquidity requirements in Basel III affect Banks' lending and performance. The second essay expands the classic Diamond and Dybvig model of banking. In this new model, households can not only deposit in a bank but also directly invest in the bank's equity. In addition, the asset portfolio of the bank has an effect on the probability of a bank run. This new model helps us to explore how to find the "effective ranges" of capital and liquidity regulations, in which the bank-run probability declines from the original level. The paper also discusses how capital and liquidity regulations change behaviors of banks and households. Compared with the liquidity requirement, the capital requirement has only a slight impact on the social welfare. In the third essay, I develop a general equilibrium model with banks of heterogeneous size to study optimal capital and liquidity requirements. I first show that when only a capital requirement is available, the optimal policy is size-dependent: larger banks face stricter capital requirements. If regulations must instead be size-independent, I show that introducing a liquidity requirement can raise welfare. This result arises because a capital requirement is more likely to bind in small banks, while a liquidity requirement tends to bind in large banks. I derive the optimal size-independent policy pair and show how the regulator uses the two policies to affect large and small banks differently. My results provide a novel justification for liquidity requirements: they interact with capital requirements to provide a regulator more flexibility.
Design and development of frequency tuneable vibration based piezoelectric energy harvester
Creators: name: Pradeesh, E. L.
name: Udhayakumar, S.
name: Vasundhara, M. G.
name: Nijandhan, K.
Publisher: name: Taylor & Francis
Year: 2021
Subjects: subject: 29999 Physical Sciences not elsewhere classified
subject: FOS: Physical sciences
subject: Physiology
subject: FOS: Biological sciences
subject: Evolutionary Biology
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: Ecology
subject: 69999 Biological Sciences not elsewhere classified
subject: Marine Biology
subject: Science Policy

description: This paper presents the design and development of manual frequency tuneable energy harvester. The energy harvester consists of beam, piezoelectric materials, proof mass, charging circuit, storage device and enclosure box. The design of beam and proof mass was made using the output of previous work and other parts were designed in this work. The energy harvester was developed based on the design and placed into the enclosure box. The fabricated model was tested to know the performance of energy harvester by analysing the output voltage, current, power and charging time of the battery. The distance of proof mass was varied from the fixed end of the cantilever beam to tune the frequency of energy harvester. From the experiment, it was found that the proof mass of energy harvester at 115 mm produced 88.77% more power compared to the proof mass placed at 85 mm from the fixed end. The operating range of energy harvester is about 5 Hz to 30 Hz. The proof mass placed at a distance of 155 mm from the fixed end charge the 60 mAh battery at 65.14% faster compared to the proof mass placed at 85 mm from the fixed end.
UBC Farm agroforestry product lines
Creators: name: Morton, Elliott
name: Northrup, Graeme
name: Graeme, Catherine
name: Scheppke, Daniel
Publisher: name: The University of British Columbia
Year: 2014

description: There is a potential for expanding the types of agroforestry systems at The UBC Farm (UBCF). New agroforestry product lines would add functionality to the UBCF’s forested spaces and hedgerows, provide new sources of revenue, and provide an example for how agroforestry systems can be managed and implemented for other BC farms. The goals of the UBCF Agroforestry Product Lines Project were: to identify potential new agroforestry product lines for the UBC Farm, and to assess their potential for profit. This project was a collaboration between a group of UBC Students from LFS 450, and the UBC Farm (UBCF). The group identified a range of potential agroforestry projects. After consulting with the UBCF, the group decided to focus on the production of medicinal plants on the edges of the forested spaces and hedgerows for a local medicinal plant retailer. The students prepared a business plan to outline the implementation of this project, and to assess its potential for profit. The group identified three medicinal plants (borage, comfrey, and yarrow) that could be grown and processed by the farm, and sold to the retail partner. They found that the farm has the potential to make $2800 profit from this project annually. Medicinal plant production has very low fixed costs, so the UBCF does not have to sell a lot of product to cover their costs. Medicinal plant production at the UBCF has a great potential for being a profitable project for the UBCF. This group recommends that the UBCF integrates medicinal plants into their agroforestry systems. Also, future LFS 450 groups should continue to work on developing new agroforestry projects for the UBCF. Disclaimer: “UBC SEEDS provides students with the opportunity to share the findings of their studies, as well as their opinions, conclusions and recommendations with the UBC community. The reader should bear in mind that this is a student project/report and is not an official document of UBC. Furthermore readers should bear in mind that these reports may not reflect the current status of activities at UBC. We urge you to contact the research persons mentioned in a report or the SEEDS Coordinator about the current status of the subject matter of a project/report.”
Strange Pentaquark Hadrons in Statistical Hadronization
Creators: name: Letessier, J.
name: Torrieri, G.
name: Steinke, S.
name: Rafelski, J.
Publisher: name: arXiv
Year: 2003
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We study, within the statistical hadronization model, the influence of narrow strangeness carrying baryon resonances (pentaquarks) on the understanding of particle production in relativistic heavy ion collisions. There is a great variation of expected yields as function of heavy ion collision energy due to rapidly evolving chemical conditions at particle chemical freeze-out. At relatively low collision energies, these new states lead to improvement of statistical hadronization fits.
description: 4 pages including two tables and 3 figures; published, updated references
Negative group delay-enabled reconfigurable non-foster elements and beamforming networks
Creators: name: Zhu, Minning
Publisher: name: No Publisher Supplied
Year: 2021

description: As a counterintuitive phenomenon, negative group delay (NGD) was first found in regions of strong anomalous dispersion. The peak of the pulse emerges from the device's output at an instant before the peak of the pulse enters its input. Later, the circuit approaches of NGD are realized. In this work, reconfigurability enhanced distributed amplifier (DA) -based NGD circuit and its applications in realizing non-Foster elements and beamforming networks will be discussed. The proposed circuit incorporates varactors at the input and output ports of the DA-based NGD circuit, notably enhances the tuning range for the amplitude, overall phase, and the NGD responses, thereby enables flexible S-parameter synthesis with a wider reconfigurable range. Compared with other approaches, the reconfigurability enhanced DA-based NGD circuit has the advantages of: 1) Simple structure that enables gain, phase, and NGD to be widely tuned individually2) Wide bandwidth performance with the distributed amplifier design3) Good impedance matching and unconditionally stability4) Can be fabricated on MMIC platform, easy to work at higher frequency Firstly, we will give a review of the current NGD circuits and their performances. Secondly, a description of the proposed distributed-amplifier-based NGD circuit will be provided, including the theory and objectives. In the theory part, a general N-stage transfer function for the proposed reconfigurable NGD circuit is derived and discussed. A 2-stage case is given as an illustrative proof-of-concept example. The objectives include how to create tunable non-Foster elements and tunable squint-free beamforming networks by applying the reconfigurability enhanced NGD circuits into the design. Thirdly, prototypes based on the reconfigurable NGD circuits will be demonstrated, including a reconfigurable negative capacitor, squint-free antenna beamforming networks, and others. A tunable NGD enabled negative capacitor is simulated and fabricated; the prototype shows it can be tuned within an outstanding range from -1.0 pF to -4.0 pF over a bandwidth of 100 MHz at 1 GHz. A series-type squint-free antenna array feeding network is simulated and fabricated, and devices with/without varactors are compared. By synthesizing a low-dispersion superluminal antenna array feeding line, we first realized a main beam steerable series-type squint-free antenna array. Experimental results show that the main beam of the NGD-enabled antenna array has a tuning range from -15° to 15° within a squint-free bandwidth of 100 MHz at 2 GHz. Compared with the one without varactors, the main beam tuning range has tripled.Due to the transversal-filter-based design, the above applications can benefit from a wider operation bandwidth by either applying more parallel stages or cascading more series unit cells.
Ethulia paniculata Houtt.
Creators: name: Wijnands, Dirk Onno
name: Heniger, Johannes
name: Veldkamp, Jan Frederik
name: Fumeaux, Nicolas
name: Callmander, Martin W.
Publisher: name: Zenodo
Year: 2017
Subjects: Biodiversity
Taxonomy
Plantae
Tracheophyta
Magnoliopsida
Asterales
Asteraceae
Ethulia
Ethulia paniculata

description: 45. Ethulia paniculata Houtt.,
Nat. Hist. II(10): Aanwyz. Plaat. [3], 551, tab. 67, fig. 2. 1779.
Lectotypus (designated here by Callmander): INDONESIA. Java: Anon. s.n. (G-PREL [G00818113]!).
= Dichrocephala integrifolia (L. f.) Kuntze, Revis. Gen. Pl. 1: 333. 1891.
Notes. – Original material is present in the Java herbarium in G-PREL. The single collection with Houttuyn’s handwriting is designated here as the lectotype. It is a good match for the plate. Dichrocephala paniculata Miq. prevents the transfer of the earlier Houttuyn binomial to Dichrocephala L’Hér. ex DC. Another collection in the Houttuyn herbarium (G-PREL [G00818116]), cited under the name Spilanthes atriplicifolius (L.) L. in the Natuurlijke Historie (Nat. Hist. II(10): 536. 1779), also represents D. integrifolia.
description: Published as part of Wijnands, Dirk Onno, Heniger, Johannes, Veldkamp, Jan Frederik, Fumeaux, Nicolas & Callmander, Martin W., 2017, The botanical legacy of Martinus Houttuyn (1720 - 1798) in Geneva, pp. 155-198 in Candollea 72 (1) on page 174, DOI: 10.15553/c2017v721a11, http://zenodo.org/record/5721887
Joseph Cornell's Circe Collages
Creators: name: McWilliams, Martha
name: Garrard, Mary D.
Publisher: name: American University (Washington, D.C.)
Year: 2023
Subjects: classificationCode: 3601
subject: Art history, theory and criticism

description: Research paper submitted to American University in partial fulfillment of the Degree of Master of Arts; approved as non-thesis option
Masaccio's Trinity Fresco
Creators: name: McWilliams, Martha
name: Watkins, Law B.
Publisher: name: American University (Washington, D.C.)
Year: 2023
Subjects: classificationCode: 3601
subject: Art history, theory and criticism

description: Research paper submitted to American University in partial fulfillment of the Degree of Master of Arts; approved as non-thesis option
Correlation between thermal expansion and heat capacity
Creators: name: Garai, Jozsef
Publisher: name: arXiv
Year: 2004
Subjects: subject: General Physics (physics.gen-ph)
subject: FOS: Physical sciences

description: Theoretically predicted linear correlation between the volume coefficient of thermal expansion and the thermal heat capacity was investigated for highly symmetrical atomic arrangements. Normalizing the data of these thermodynamic parameters to the Debye temperature gives practically identical curves from zero Kelvin to the Debye temperature. This result is consistent with the predicted linear correlation. At temperatures higher than the Debye temperature the normalized values of the thermal expansion are always higher than the normalized value of the heat capacity. The detected correlation has significant computational advantage since it allows calculating the volume coefficient of thermal expansion from one experimental data by using the Debye function.
Parameters of Tomonaga-Luttinger liquid in a quasi-1D material with Coulomb interactions
Creators: name: Chudzinski, P.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: In this work we derive a new scheme to calculate Tomonaga-Luttinger liquid (TLL) parameters and holon (charge modes) velocities in a quasi-1D material that consists of two-leg ladders coupled through Coulomb interactions. Firstly, we obtain an analytic formula for electron-electron interaction potential along the conducting axis for a generalized charge distribution in a plane perpendicular to it. In the second step we introduce many-body screening that is present in a quasi-1D material. To this end we propose a new approximation for the charge susceptibility. Based on this we are able to find the TLL's parameters and velocities. We then show how to use these to validate the experimental ARPES data measured recently in p-polarization in $NbSe_3$. Although we focus our study on this specific material it is applicable for any quasi-1D system that consists of two-leg ladders as basic units.
Excitation spectra of a 3He impurity on 4He clusters
Creators: name: Fantoni, S.
name: Guardiola, R.
name: Navarro, J.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: The diffusion Monte Carlo technique is used to calculate and analyze the excitation spectrum of a single 3He atom bound to a cluster with N 4He atoms, with the aim of establishing the most adequate filling ordering of single-fermion orbits to the mixed clusters with a large number of 3He atoms. The resulting ordering looks like the rotational spectrum of a diatomic molecule, being classified only by the angular momentum of the level, although vibrational-like excitations appear at higher energies for sufficiently large N.
Pontormo's Passion Cycle at the Certosa del Galluzzo : New Light on its Meaning
Creators: name: Moreno, Ignacio L.
name: Garrard, Mary D.
Publisher: name: American University (Washington, D.C.)
Year: 2023
Subjects: classificationCode: 3601
subject: Art history, theory and criticism

description: Research paper submitted to American University in partial fulfillment of the Degree of Master of Arts; approved as non-thesis option
The Land Escapes of Maxfield Parrish
Creators: name: Naron, Jacqueline Nast
name: Shaffer, Robert
Publisher: name: American University (Washington, D.C.)
Year: 2023
Subjects: classificationCode: 3601
subject: Art history, theory and criticism

description: Research paper submitted to American University in partial fulfillment of the Degree of Master of Arts; approved as non-thesis option
Axially symmetric multi-baryon solutions and their quantization in the chiral quark soliton model
Creators: name: Komori, S.
name: Sawado, N.
name: Shiiki, N.
Publisher: name: arXiv
Year: 2003
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: In this paper, we study axially symmetric solutions with $B=2-5$ in the chiral quark soliton model.In the background of axially symmetric chiral fields, the quark eigenstates and profile functions of the chiral fields are computed self-consistently. The resultant quark bound spectrum are doubly degenerate due to the symmetry of the chiral field. Upon quantization, various observable spectra of the chiral solitons are obtained. Taking account of the Finkelstein-Rubinstein constraints, we show that our results exactly coincide with the physical observations for B=2 and 4 while B=3 and 5 do not.
description: 19 pages, 11 figures, 5 tables
Experimental and simulation studies on dielectric, AC resistivity and electromechanical properties of sodium bismuth titanate based ceramics
Creators: name: Syed, Mahboob
name: Rizwana
name: Prasad, G.
name: Kumar, G. S.
Publisher: name: Taylor & Francis
Year: 2022
Subjects: subject: Biophysics
subject: Space Science
subject: 29999 Physical Sciences not elsewhere classified
subject: FOS: Physical sciences
subject: Medicine
subject: Biotechnology
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: 19999 Mathematical Sciences not elsewhere classified
subject: FOS: Mathematics
subject: Cancer

description: The experimental and simulation of dielectric, AC resistivity and dielectric resonance and anti-resonance data on (Na0.5Bi0.5)(NdxTi1-2xNbx)O3] ceramics were carried out using modified Lorentz equations as proposed by us instead of well know and generally applied laws like Arrhenius law and formulas on piezoelectricity to obtain activation energy, relaxation time, piezoelectric charge constant and voltage constant directly from the experimental data. The piezoelectric charge constant (d33) evaluated from the modeling are 864.64 p.m/V and 122.40 p.m/V; whereas the piezoelectric voltage constant (g33) are 10.88 p.m2/C and 8.55 p.m2/C for x = 0.0125 and 0.025 ceramic samples, respectively.
Geranium chelidonium Houtt.
Creators: name: Wijnands, Dirk Onno
name: Heniger, Johannes
name: Veldkamp, Jan Frederik
name: Fumeaux, Nicolas
name: Callmander, Martin W.
Publisher: name: Zenodo
Year: 2017
Subjects: Biodiversity
Taxonomy
Plantae
Tracheophyta
Magnoliopsida
Geraniales
Geraniaceae
Geranium
Geranium chelidonium

description: 46. Geranium chelidonium Houtt.,
Nat. Hist. II(10): Aanwyz. Plaat. [1], 8, tab. 61. 1779.
≡ Pelargonium chelidonium (Houtt.) DC., Prodr. 1: 650. 1824.
Lectotypus (designated here by Veldkamp & Callmander): SOUTH AFRICA: Cape, Auge s.n. [?] (G-PREL [G00818043]!; isolecto-: G-DC [G00213107]!).
Notes. – The single collection in the Cape herbarium in G-PREL is designated here as the lectotype. A fragment of this collection is in the G-DC herbarium. No matching specimen is present in UPS-THUNB. Pelargonium ficaria Willd. (WILLDENOW, 1800: 643) is a superfluous name. No specimen has been found in the Willdenow herbarium (B-W).
description: Published as part of Wijnands, Dirk Onno, Heniger, Johannes, Veldkamp, Jan Frederik, Fumeaux, Nicolas & Callmander, Martin W., 2017, The botanical legacy of Martinus Houttuyn (1720 - 1798) in Geneva, pp. 155-198 in Candollea 72 (1) on page 174, DOI: 10.15553/c2017v721a11, http://zenodo.org/record/5721887
Stress deformations and structural quenching in Sm0.5Ca0.5MnO3 thin films allow a huge decrease of the charge order melting magnetic field
Creators: name: Rauwel, E.
name: Prellier, W.
name: Mercey, B.
name: de Brion, S.
name: Chouteau, G.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Thin films of Sm0.5Ca0.5MnO3 manganites with charge ordering (CO) properties and colossal magnetoresistance were synthesized by pulsed laser deposition technique on (100)-SrTiO3 and (100)-LaAlO3 substrates. We first compare the structural modifications as function of the substrate and film thickness. Secondly, measuring transport properties in magnetic fields up to 24T, we establish the temperature-field phase diagram describing the stability of the CO state and compare it to bulk material. We show that some structural modification induced by the substrate occurs and that the CO melting magnetic field is greatly reduced. Moreover, with the temperature decrease, no modification of the lattice parameters is observed. We then propose an explanation based on the quenching of the unit cell of the film that adopts the in-plane lattice parameters of the substrate and thus, prevents the complete growth of the CO state at low temperature.
description: to be published in Journal of Applied Physics
Properties of the post in-spiral common envelope ejecta II: dust formation
Creators: name: Iaconi, Roberto
name: Maeda, Keiichi
name: Nozawa, Takaya
name: De Marco, Orsola
name: Reichardt, Thomas
Publisher: name: arXiv
Year: 2020
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We study the formation of dust in the expanding gas ejected as a result of a common envelope binary interaction. In our novel approach, we apply the dust formation model of Nozawa et al. to the outputs of the 3D hydrodynamic SPH simulation performed by Iaconi et al., that involves a giant of 0.88~\ms \ and 83~\rs, with a companion of 0.6~\ms \ placed on the surface of the giant in circular orbit. After simulating the dynamic in-spiral phase we follow the expansion of the ejecta for $\simeq 18\,000$~days. During this period the gas is able to cool down enough to reach dust formation temperatures. Our results show that dust forms efficiently in the window between $\simeq 300$~days (the end of the dynamic in-spiral) and $\simeq 5000$~days. The dust forms in two separate populations; an outer one in the material ejected during the first few orbits of the companion inside the primary's envelope and an inner one in the rest of the ejected material. We are able to fit the grain size distribution at the end of the simulation with a double power law. The slope of the power law for smaller grains is flatter than that for larger grains, creating a knee-shaped distribution. The power law indexes are however different from the classical values determined for the interstellar medium. We also estimate that the contribution to cosmic dust by common envelope events is not negligible and comparable to that of novae and supernovae.
description: 15 pages, 8 figures; accepted by MNRAS
Bioreactor and small molecule drug applications in hair cell differentiation
Creators: name: Yip, Sylvia
Publisher: name: No Publisher Supplied
Year: 2021

description: Hair cells are mechanoreceptors of the inner ear that convert sounds into electrical signals to be perceived by the brain. The gradual loss of hair cells is common after a lifetime of chronic exposure to loud noises. Mammalian hair cells lack the ability to regenerate after embryonic development. Advancements in regenerative medicine strategies have been employed to restore function to damaged organs. The use of stem cells can regenerate and replace damaged hair cells. Understanding how stem cells differentiate into hair cells will provide insight into regeneration. To study hair cell regeneration, we employed an inner ear organoid system. Immortalized multipotent otic progenitor (iMOP) cells that differentiate into spiral ganglion neurons, supporting cells, and hair cells were used to generate organoids. This study tests whether a bioreactor facilitates sensory epithelial differentiation. The bioreactor agitates the medium to promote nutrient diffusion in the cultures. After ten days of differentiation, iMOP-derived organoids were collected, and relative changes in transcripts and protein markers that correspond to neurons, supporting cells, and hair cells were determined. The use of a bioreactor increased the percentage of cells expressing MYO6, a hair cell marker. The percentage of TUBB3 labeled neurons also increased while GFAP labeled supporting cells remained the same. Relative levels of Myo6 mRNA did not increase in any of the culture conditions while relative levels of Tubb3 mRNA significantly increased in all cultures compared to control samples.
Pair production in a strong slowly varying magnetic field: the effect of a background gravitational field
Creators: name: Di Piazza, Antonino
Publisher: name: arXiv
Year: 2003
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The production probability of an $e^--e^+$ pair in the presence of a strong, uniform and slowly varying magnetic field is calculated by taking into account the presence of a background gravitational field. The curvature of the spacetime metric induced by the gravitational field not only changes the transition probabilities calculated in the Minkowski spacetime but also primes transitions that are strictly forbidden in absence of the gravitational field.
description: 56 pages, no figures
The Collins asymmetry in electroproduction of Kaon at the electron ion colliders within TMD factorization
Creators: name: Xue, Shi-Chen
name: Wang, Xiaoyu
name: Li, De-Min
name: Lu, Zhun
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We apply the transverse momentum dependent factorization formalism to investigate the transverse single spin dependent Collins asymmetry with a $\sin(ϕ_h+ϕ_s)$ modulation in the semi-inclusive production of Kaon meson in deep inelastic scattering process. The asymmetry is contributed by the convolutions of the transversity distribution function $h_1(x)$ of the target proton and the Collins function of the Kaon in the final state. We adopt the available parametrization of $h_1(x)$ as well as the recent extracted result for the Kaon Collins function. To perform the transverse momentum dependent evolution, the parametrization of the nonperturbative Sudakov form factor of the proton and final state Kaon are utilized. We numerically predict the Collins asymmetry for charged Kaon production at the electron ion colliders within the accuracy of next-to-leading-logarithmic order. It is found that the asymmetry is sizable and could be measured. We emphasize the importance of planned electron ion colliders in the aspect of constraining sea quark distribution functions as well as accessing the information of the nucleon spin structure and the hadronization mechanism.
Inferring water scarcity vulnerabilities: do converging model representations of water systems lead to convergent insights?
Creators: name: Hadjimichael, Antonia
name: Yoon, Jim
name: Reed, Patrick M.
name: Voisin, Nathalie
Publisher: name: Zenodo
Year: 2021

description: This poster has been presented at the AGU Fall Meeting 2021 Globally increasing demand for water services and risks of water scarcity are causing river basin managers to struggle with how to best manage their water resources. These challenges have motivated rapid growth in model development and simulation to aid evaluations of the performance of alternative management policies and project future conditions. In recent efforts focused on modeling water availability, a divide has emerged between the research community of large-scale hydrologic modelers emphasizing hydro-climatological processes and that of watershed-system modelers emphasizing the environmental, infrastructural, and institutional features that shape water scarcity at the local basin level. These two research foci each rely on dynamics at different scales but have been increasingly converging towards one another, with basin-scale models directing efforts toward improved incorporation of climatic processes, and global- and regional-scale hydrologic models directing efforts toward improving their representation of how humans convey, store, use, and govern water. This study assesses if convergent insights on water scarcity assessment can be drawn from two representative state-of-the-art models from each of these communities. The comparison is focused on the Upper Colorado Basin within the state of Colorado and evaluates whether the conclusions one would draw about scarcity for water users in the basin would be consistent between the two models. Results suggest that the regional-scale model (MOSART-WM) can overestimate basin-scale water scarcity vulnerability while underestimating its sub-basin scale variability. The basin-scale model (StateMod) suggests a larger variance of scarcity across the basin’s water users. This could be due to several factors, including the simplified reservoir operations and the coarse representation of human elements in the basin by MOSART-WM, as well as the simplified institutional mechanisms of allocation. These outcomes can be used to inform the interpretation of large-scale studies on water scarcity, as well as how the two scales of analysis can be bridged to maintain both large-scale theoretical soundness and decision-scale relevance.
Representation of Exchange Option Prices under Stochastic Volatility Jump-Diffusion Dynamics
Creators: name: Cheang, Gerald H. L.
name: Garces, Len Patrick Dominic M.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Mathematical Finance (q-fin.MF)
subject: Pricing of Securities (q-fin.PR)
subject: FOS: Economics and business
subject: 91G30

description: In this article, we provide representations of European and American exchange option prices under stochastic volatility jump-diffusion (SVJD) dynamics following models by Merton (1976), Heston (1993), and Bates (1996). A Radon-Nikodym derivative process is also introduced to facilitate the shift from the objective market measure to other equivalent probability measures, including the equivalent martingale measure. Under the equivalent martingale measure, we derive the integro-partial differential equation that characterizes the exchange option prices. We also derive representations of the European exchange option price using the change-of-numeraire technique proposed by Geman et al. (1995) and the Fourier inversion formula derived by Caldana and Fusai (2013), and show that these two representations are comparable. Lastly, we show that the American exchange option price can be decomposed into the price of the European exchange option and an early exercise premium.
description: 45 pages, 1 figure
Random Solitons Realization of Quantum Mechanics and Stochastic Qubits
Creators: name: Rybakov, Yu. P.
name: Kamalov, T. F.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Stochastic realization of the wave function in quantum mechanics, with the inclusion of soliton representation of extended particles, is discussed. The concept of Stochastic Qubits is used for quantum computing modeling.
description: 7 pages, LaTeX
Geranium ovale Burm.
Creators: name: Wijnands, Dirk Onno
name: Heniger, Johannes
name: Veldkamp, Jan Frederik
name: Fumeaux, Nicolas
name: Callmander, Martin W.
Publisher: name: Zenodo
Year: 2017
Subjects: Biodiversity
Taxonomy
Plantae
Tracheophyta
Magnoliopsida
Geraniales
Geraniaceae
Geranium
Geranium ovale

description: 47. Geranium ovale Burm. f.,
Fl. Ind. (Prodr. Fl. Cap.): 19. 1768.
≡ Pelargonium ovale (Burm. f.) L’Hér. in Aiton, Hort. Kew. 2: 429. 1789.
Lectotypus (designated by VAN DER WALT & VAN ZUYL, 1988: 150): SOUTH AFRICA: Cape, Auge s.n. [?] (G-PREL [G00818133]!).
Notes. – There is a specimen in Houttuyn’s Cape herbarium [G00818133]. VAN DER WALT & VAN ZUYL (1988: 150) designated a “specimen with Burman handwriting” as the lectotype but clearly failed to recognise Houttuyn’s handwriting. This specimen, probably collected by Auge, should be considered in the lectotypification of Burman’s name as it may have been available to Burman f. and collected by Auge.
description: Published as part of Wijnands, Dirk Onno, Heniger, Johannes, Veldkamp, Jan Frederik, Fumeaux, Nicolas & Callmander, Martin W., 2017, The botanical legacy of Martinus Houttuyn (1720 - 1798) in Geneva, pp. 155-198 in Candollea 72 (1) on page 174, DOI: 10.15553/c2017v721a11, http://zenodo.org/record/5721887
A STOCHASTIC METHOD FOR GLOBAL OPTIMIZATION
Creators: name: Boender, C. G. E.
name: Rinnooy Kan, A. H. G.
name: Stougie, L.
name: Timmer, G. T.
name: Boender, C. G. E.
name: Rinnooy Kan, A. H. G.
name: Stougie, L.
name: Timmer, G. T.
Publisher: name: Unknown
Year: 1980
Subjects: Agricultural and Food Policy
International Development

description: A stochastic method for global optimization is described and evaluated. The method involves a combination of sampling, clustering and local search, and terminates with a range of confidence intervals on the value of the global optimum. Computational results on standard test functions are included as well.
Additional file 1 of Transcriptome Ortholog Alignment Sequence Tools (TOAST) for phylogenomic dataset assembly
Creators: name: Wcisel, Dustin J.
name: J. Thomas Howard
name: Yoder, Jeffrey A.
name: Dornburg, Alex
Publisher: name: figshare
Year: 2020
Subjects: subject: Information Systems
subject: FOS: Computer and information sciences

description: Additional file 1 .
SWAS observations of comet 9P/Tempel 1 and Deep Impact
Creators: name: Bensch, Frank
name: Melnick, Gary J.
name: Neufeld, David A.
name: Harwit, Martin
name: Snell, Ronald L.
name: Patten, Brian M.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: On 4 July 2005 at 1:52 UT the Deep Impact mission successfully completed its goal to hit the nucleus of 9P/Tempel 1 with an impactor, forming a crater on the nucleus and ejecting material into the coma of the comet. The 370 kg impactor collided with the sunlit side of the nucleus with a relative velocity of 10.2 km/s. NASA's Submillimeter Wave Astronomy Satellite (SWAS) observed the 1(10)-1(01) ortho-water ground-state rotational transition in comet 9P/Tempel 1 before, during, and after the impact. No excess emission from the impact was detected by SWAS. However, the water production rate of the comet showed large natural variations of more than a factor of three during the weeks before the impact.
description: to appear in the proceedings of the IAU Symposium No. 231: "Astrochemistry - Recent Successes and Current Callenges". Typo corrected in author affiliation list
Diode-like Selective Enhancement of Carrier Transport through Metal-Semiconductor Interface Decorated by Monolayer Boron Nitride
Creators: name: Jaiswal, Hemendra Nath
name: Liu, Maomao
name: Shahi, Simran
name: Wei, Sichen
name: Lee, Jihea
name: Chakravarty, Anindita
name: Guo, Yutong
name: Wang, Ruiqiang
name: Lee, Jung Mu
name: Chang, Chaoran
name: Fu, Yu
name: Dixit, Ripudaman
name: Liu, Xiaochi
name: Yang, Cheng
name: Yao, Fei
name: Li, Huamin
Publisher: name: arXiv
Year: 2020
Subjects: subject: Applied Physics (physics.app-ph)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Two-dimensional (2D) semiconductors are promising material candidates for next-generation nanoelectronics. However, there are fundamental challenges related to their metal-semiconductor (MS) contacts which limit the performance potential for practical device applications. In this work, we exploit 2D monolayer hexagonal boron nitride (h-BN) as an ultrathin decorating layer to form a metal-insulator-semiconductor (MIS) contact, and demonstrate a novel diode-like selective enhancement of the carrier transport through it. Compared to the conventional MS contact, the MIS contact dominated by both thermionic emission and quantum tunneling can significantly reduce the contact resistance and boost the electron transport from the semiconductor to the metal, but has negligible effects on the electron transport oppositely. We also investigate the negative barrier height with the concept of carrier collection barrier, and show its critical role at the drain end for determining the overall transistor performance.
description: Currently under review
Giorgio de Chirico's Paintings of Italian Squares as Fantasy in Art
Creators: name: Pardoe, Elizabeth W
name: Shaffer, Robert
Publisher: name: American University (Washington, D.C.)
Year: 2023
Subjects: classificationCode: 3601
subject: Art history, theory and criticism

description: Research paper submitted to American University in partial fulfillment of the Degree of Master of Arts; approved as non-thesis option
Geranium tetragonum L. f.
Creators: name: Wijnands, Dirk Onno
name: Heniger, Johannes
name: Veldkamp, Jan Frederik
name: Fumeaux, Nicolas
name: Callmander, Martin W.
Publisher: name: Zenodo
Year: 2017
Subjects: Biodiversity
Taxonomy
Plantae
Tracheophyta
Magnoliopsida
Geraniales
Geraniaceae
Geranium
Geranium tetragonum

description: 48. Geranium tetragonum L. f.,
Suppl. Pl.: 305. 1782.
≡ Pelargonium tetragonum (L. f.) L’Hér. in Aiton, Hort. Kew. 2: 427. 1789.
– Geranium quadrangulare Thunb. [nom. nud.].
Lectotypus (designated by ALBERS et al., 1995: 344): SOUTH AFRICA: Thunberg s.n. (UPS-THUNB n° 15663!; isolecto-: G-PREL [G00818045, G00818046, G00818047, G00818048]!, UPS-THUNB n° 15662 image seen).
Notes. – Geranium tetragonum was based on a Thunberg specimen from the Cape. ALBERS et al. (1995: 344) designated a specimen in UPS-THUNB as the lectotype. Four duplicates of this collection are also present in G-PREL: three in the Burman herbarium [G00818045, G00818046, G00818047] and one in the Houttuyn herbarium [G00818048]. The latter bears the name G. quadrangulare Thunb. in Houttuyn’s handwriting. The four G-PREL collections are duplicates of the original material and are here considered as isolectotypes.
description: Published as part of Wijnands, Dirk Onno, Heniger, Johannes, Veldkamp, Jan Frederik, Fumeaux, Nicolas & Callmander, Martin W., 2017, The botanical legacy of Martinus Houttuyn (1720 - 1798) in Geneva, pp. 155-198 in Candollea 72 (1) on page 176, DOI: 10.15553/c2017v721a11, http://zenodo.org/record/5721887
Distribution of epicenters in the Olami-Feder-Christensen model
Creators: name: Peixoto, Tiago P.
name: Prado, Carmen P. C.
Publisher: name: arXiv
Year: 2003
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We show that the well established Olami-Feder-Christensen (OFC) model for the dynamics of earthquakes is able to reproduce a new striking property of real earthquake data. Recently, it has been pointed out by Abe and Suzuki that the epicenters of earthquakes could be connected in order to generate a graph, with properties of a scale-free network of the Barabasi-Albert type. However, only the non conservative version of the Olami-Feder-Christensen model is able to reproduce this behavior. The conservative version, instead, behaves like a random graph. Besides indicating the robustness of the model to describe earthquake dynamics, those findings reinforce that conservative and non conservative versions of the OFC model are qualitatively different. Also, we propose a completely new dynamical mechanism that, even without an explicit rule of preferential attachment, generates a free scale network. The preferential attachment is in this case a ``by-product'' of the long term correlations associated with the self-organized critical state. The detailed study of the properties of this network can reveal new aspects of the dynamics of the OFC model, contributing to the understanding of self-organized criticality in non conserving models.
description: 7 pages, 7 figures
A RECURSIVE APPROACH TO THE IMPLEMENTATION OF ENUMERATIVE METHODS
Creators: name: Lenstra, J. K.
name: Rinnooy Kan, A. H. G.
name: Lenstra, J. K.
name: Rinnooy Kan, A. H. G.
Publisher: name: Unknown
Year: 1980
Subjects: Agricultural and Food Policy
Research Methods/ Statistical Methods

description: Algorithms for generating permutations by means of both lexicographic and minimum-change methods are presented. A recursive approach to their implementation leads to transparent procedures that are easily proved correct; moreover, they turn out to be no less efficient than previous iterative generators. Some applications of explicit enumeration to combinatorial optimization problems, exploiting the minimum-change property, are indicated. Finally, a recursive approach to implicit enumeration is discussed.
Over-sized gas clumps in an extremely-metal-poor molecular cloud revealed by ALMA's pc-scale maps
Creators: name: Shi, Yong
name: Wang, Junzhi
name: Zhang, Zhi-Yu
name: Zhang, Qizhou
name: Gao, Yu
name: Zhou, Luwenjia
name: Gu, Qiusheng
name: Qiu, Keping
name: Xia, Xiao-Yang
name: Hao, Cai-Na
name: Chen, Yanmei
Publisher: name: arXiv
Year: 2020
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Metals are thought to have profound effects on the internal structures of molecular clouds in which stars are born. The absence of metals is expected to prevent gas from efficient cooling and fragmentation in theory. However, this effect has not yet been observed at low metallicity environments, such as in the early Universe and local dwarf galaxies, because of the lack of high spatial resolution maps of gas. We carried out ALMA observations of the carbon monoxide (CO) J=2-1 emission line at 1.4-parsec resolutions of a molecular cloud in DDO 70 at 7% solar metallicity, the most metal-poor galaxy currently known with a CO detection. In total, five clumps have been identified and they are found to follow more or less the Larson's law. Since the CO emission exists in regions with visual extinction A_V around 1.0, we converted this A_V to the gas mass surface density using a gas-to-dust ratio of 4,594+-2,848 for DDO 70. We found that the CO clumps in DDO 70 exhibit significantly larger (on average four times) sizes than those at the same gas mass surface densities in massive star-formation regions of the Milky Way. The existence of such large clumps appears to be consistent with theoretical expectations that gas fragmentation in low metallicity clouds is suppressed. While our observation is only for one cloud in the galaxy, if it is representative, the above result implies suppressed gas fragmentation during the cloud collapse and star formation in the early Universe.
description: ApJ in press, 8 figures
Project on server room management
Creators: name: Leung, Auburn
name: Wang, Yu Chen
Publisher: name: The University of British Columbia
Year: 2014

description: The electrical transmission at UBC is reaching its capacity. Reducing electricity consumption can delay the implementation of new infrastructures and reduce GHG emission. Server rooms are often over-cooled because IT manager are reluctant to allow high operating temperature which may decrease the dependability of server equipment. This report will determine the feasibility of reducing energy consumption by raising the operational temperature in the Fred Kaiser server room while maintaining a healthy environment for the equipment. The results will be based on costs calculations, technical interviews, and failure estimations. Disclaimer: “UBC SEEDS provides students with the opportunity to share the findings of their studies, as well as their opinions, conclusions and recommendations with the UBC community. The reader should bear in mind that this is a student project/report and is not an official document of UBC. Furthermore readers should bear in mind that these reports may not reflect the current status of activities at UBC. We urge you to contact the research persons mentioned in a report or the SEEDS Coordinator about the current status of the subject matter of a project/report.”
NLP-Infrastruktur für die Klassische Philologie
Creators: name: Beyer, Andrea
name: Schulz, Konstantin
Publisher: name: Zenodo
Year: 2024
Subjects: natural language processing
research infrastructure
Classics
computational literary studies

description: Folien zum Vortrag im Kolloquium "Phänomenologie der Digital Humanities" des Lehrstuhls für Digital Humanities an der Freien Universität Berlin: https://wikis.fu-berlin.de/display/phaenodh