cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Generalised Brownian Motion and Second Quantisation
Creators: name: Guta, Madalin
name: Maassen, Hans
Publisher: name: arXiv
Year: 2000
Subjects: subject: Mathematical Physics (math-ph)
subject: Operator Algebras (math.OA)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: A new approach to the generalised Brownian motion introduced by M. Bozejko and R. Speicher is described, based on symmetry rather than deformation. The symmetrisation principle is provided by Joyal's notions of tensorial and combinatorial species. Any such species V gives rise to an endofunctor F_V of the category of Hilbert spaces with contractions. A generalised Brownian motion is an algebra of creation and annihilation operators acting on F_V(H) for arbitrary Hilbert spaces H and having a prescription for the calculation of vacuum expectations in terms of a function t on pair partitions. The positivity is encoded by a *-semigroup of "broken pair partitions" whose representation space with respect to t is V. The existence of the second quantisation as functor Gamma_t from Hilbert spaces to noncommutative probability spaces is proved to be equivalent to the multiplicative property of the function t. For a certain one parameter interpolation between the fermionic and the free Brownian motion it is shown that the ``field algebras'' Gamma(K) are type II_1 factors when K is infinite dimensional.
description: 33 pages, 5 figures
Lie-Group Approach to Perturbative Renormalization-Group Method
Creators: name: Goto, Shin-itiro
name: Masutomi, Yuji
name: Nozaki, Kazuhiro
Publisher: name: arXiv
Year: 1999
Subjects: subject: Pattern Formation and Solitons (nlin.PS)
subject: FOS: Physical sciences

description: The Lie-group approach to the perturbative renormalization group (RG) method is developed to obtain an asymptotic solutions of both autonomous and non-autonomous ordinary differential equations. Reduction of some partial differetial equations to typical RG equations is also achieved by this approach and a simple recipe for providing RG equations is presented.
description: 32pages, 2figures
Additional file 5 of Effect of therapeutic versus prophylactic anticoagulation therapy on clinical outcomes in COVID-19 patients: a systematic review with an updated meta-analysis
Creators: name: Duo, Hong
name: Li, Yahui
name: Sun, Yujie
name: Wei, Liang
name: Wang, Ziqing
name: Fang, Fang
name: Zhong, Yuxin
name: Huang, Jiao
name: Luo, Linjie
name: Peng, Zhiyong
name: Pan, Huaqin
Publisher: name: figshare
Year: 2022
Subjects: Medicine
Cancer
Science Policy
Virology
Computational Biology

description: Additional file 5. Newcastle-Ottawa Scale.
Brisingaster de Loriol 1883
Creators: name: Mah, Christopher L.
Publisher: name: Zenodo
Year: 2022
Subjects: Biodiversity
Taxonomy
Animalia
Echinodermata
Asteroidea
Brisingida
Brisingidae
Brisingaster

description: Brisingaster deLoriol 1883
 Diagnosis. As for species below.
description: Published as part of Mah, Christopher L., 2022, New Genera, Species and Occurrences of Deep-Sea Asteroidea (Valvatacea, Forcipulatacea, Echinodermata) collected from the North Pacific Ocean by the CAPSTONE Expedition, pp. 1-75 in Zootaxa 5164 (1) on page 9, DOI: 10.11646/zootaxa.5164.1.1, http://zenodo.org/record/6821026
Trimethoprim-Based Chemical Tags for High Resolution Live Cell Imaging
Creators: Jing, Chaoran
Publisher: name: Columbia University
Year: 2013
Subjects: Chemistry
Biochemistry
Cytology

description: Over the past decade chemical tags have been developed to complement the use of fluorescent proteins in live cell imaging. Chemical tags retain the specificity of protein labeling achieved with fluorescent proteins through genetic encoding, but provide smaller, more robust tags and modular use of organic fluorophores with high photon-output and tailored functionalities. The trimethoprim-based chemical tag (TMP-tag) was initially developed based on the high affinity interaction between E.coli dihydrofolatereductase and the antibiotic trimethoprim and subsequently rendered covalent and fluorogenic via proximity-induced protein labeling reactions. To date, the TMP-tag is one of the few chemical tags that enable intracellular protein labeling and high-resolution live cell imaging. In this dissertation I first focused on the development of the fluorogenic TMP-tag that enabled high resolution live cell imaging with redeced background noise. Then some efforts to further improve the fluorogenic TMP-tag were described. Furthermore, I worked with collaborators to apply the TMP-tag technology to study the dynamics of the focal adhesion complex at the single-molecule level. Finally, I also tried to develop a short peptide tag for protein labeling with minimal perturbation of the function and dynamics of the target molecule. Together, these studies exemplified the maturation of the TMP-tag technology from the proof-of-principle stage to real-world biological applications.
Palatini Variational Principle for an Extended Einstein-Hilbert Action
Creators: name: Burton, H.
name: Mann, R. B.
Publisher: name: arXiv
Year: 1997
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We consider a Palatini variation on a generalized Einstein-Hilbert action. We find that the Hilbert constraint, that the connection equals the Christoffel symbol, arises only as a special case of this general action, while for particular values of the coefficients of this generalized action, the connection is completely unconstrained. We discuss the relationship between this situation and that usually encountered in the Palatini formulation.
description: 14 pages, LaTeX
Routing Multiple Unmanned Vehicles in GPS-Denied Environments
Creators: name: Wang, Bingyu
name: Misra, Sohum
name: Rathinam, Sivakumar
name: Sharma, Rajnikant
name: Sundar, Kaarthik
Publisher: name: arXiv
Year: 2019
Subjects: subject: Optimization and Control (math.OC)
subject: FOS: Mathematics

description: This article aims to develop novel path planning algorithms required to deploy multiple unmanned vehicles in Global Positioning System (GPS) denied environments. Unmanned vehicles (ground or aerial) are ideal platforms for executing monitoring and data gathering tasks in civil infrastructure management, agriculture, public safety, law enforcement, disaster relief and transportation. Significant advancement in the area of path planning for unmanned vehicles over the last decade has resulted in a suite of algorithms that can handle heterogeneity, motion and other on-board resource constraints for these vehicles. However, most of these routing and path planning algorithms rely on the availability of the GPS information. Unintentional and intentional interference and design errors can cause GPS service outages, which in turn, can crucially affect all the systems that depend on GPS information. This article addresses a multiple vehicle path planning problem that arises while deploying a team of unmanned vehicles for monitoring applications in GPS-denied environments and presents a mathematical formulation and algorithms for solving the problem. Simulation results are also presented to corroborate the performance of the proposed algorithms.
description: 10 pages. arXiv admin note: text overlap with arXiv:1708.03269
Factorizing twists and R-matrices for representations of the quantum affine algebra U_q(\hat sl_2)
Creators: name: Pfeiffer, Hendryk
Publisher: name: arXiv
Year: 2000
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: We calculate factorizing twists in evaluation representations of the quantum affine algebra U_q(\hat sl_2). From the factorizing twists we derive a representation independent expression of the R-matrices of U_q(\hat sl_2). Comparing with the corresponding quantities for the Yangian Y(sl_2), it is shown that the U_q(\hat sl_2) results can be obtained by `replacing numbers by q-numbers'. Conversely, the limit q -> 1 exists in representations of U_q(\hat sl_2) and both the factorizing twists and the R-matrices of the Yangian Y(sl_2) are recovered in this limit.
description: 19 pages, LaTeX
Preliminary description of biosecurity practices related to moving pigs and semen onto European pig farms
Creators: name: Smith, Richard Piers
name: Vilar, Maria
name: Jones, Hannah
name: Burow, Elke
Publisher: name: Zenodo
Year: 2021

description: A preliminary description of biosecurity measures related to the import of pigs and semen onto European pig farms, collected for the BIOPIGEE project.
Trend of Parks and Open Spaces: Comparison of New York City and Seoul
Creators: Yi, Haejung
Publisher: name: Columbia University
Year: 2013
Subjects: Urban parks
Land use--Planning
City planning

description: Open green space is a significant feature in urban areas, as it contributes to public health, recreation, amenities and property values through its location, accessibility, proximity and serviceability. This thesis examines the trends of parks and open space in New York City and Seoul, Korea. Through analyzing historic documents and case studies, notions of urban parks in the two cities are shown to have been changing in different streams and motivation from their modern historic backgrounds. As open space is a broad term, this paper will point to mostly urban parks. In this case, the study sites include Central Park, Highline Park, and Bryant Park in New York City, and Namsan Park, Olympic Park, Han Riverside Park, and Cheong Gye Cheon in Seoul. In New York City since the 19th century, parks have been increasing their function to promote greater participations and to encourage implementing open space. In Seoul, there were several wars and a colonial era that impeded the development of parks but after the 1970s, urban parks started to be form according to their function in the area. Nowadays, these two cities’ patterns of open green space is converging in to green neutral ways and forming ecological cities. This research explains the meanings of parks and open space through how they have formed, functioned and evolved over time in urban areas. Also it recommends how urban parks are facing the future for a sustainable city.
On the 9:7 Mean Motion Resonance Capture in a System of Two Equal-mass Super-Earths
Creators: name: Cui, Zijia
name: Papaloizou, John C. B.
name: Szuszkiewicz, Ewa
Publisher: name: arXiv
Year: 2019
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: We study the formation of the 9:7 mean motion resonance in a system of two low-mass planets ($m_{1}=m_{2}=3M_{\oplus}$) embedded in a gaseous protoplanetary disk employing a full 2D hydrodynamic treatment of the disk-planet interactions. Our aim is to determine the disk properties that favor a capture of two equal-mass super-Earths into this second-order resonance. For this purpose, we have performed a series of numerical hydrodynamic simulations of the system of two super-Earths migrating in disks with a variety of different initial parameters and found conditions for the permanent or temporary locking in the 9:7 resonance. We observe that capture occurs during the convergent migration of planets if their resonance angle at the moment of arrival at the resonance assumes values in a certain range (inside a window of capture). The width of such a window depends on the relative migration and circularization rates that are determined by the disk parameters. The window is wide if the relative migration rate is slow, and it becomes narrower as the relative migration rate increases. The window will be closed if the migration rate is sufficiently high, and the capture will not take place. We illustrate also how the 9:7 resonance window of capture is affected by the initial eccentricities and the initial orbits of the planets.
description: 16 pages, 18 figures. Accepted to ApJ
Neutron stars in scalar-tensor theories of gravity and catastrophe theory
Creators: name: Harada, Tomohiro
Publisher: name: arXiv
Year: 1998
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We investigate neutron stars in scalar-tensor theories. We examine their secular stability against spherically symmetric perturbations by use of a turning point method. For some choices of the coupling function contained in the theories, the number of the stable equilibrium solutions changes and the realized equilibrium may change discontinuously as the asymptotic value of the scalar field or total baryon number is changed continuously. The behaviour of the stable equilibrium solutions is explained by fold and cusp catastrophes. Whether the cusp catastrophe appears or not depends on the choices of the coupling function. These types of the catastrophes are structurally stable. Recently discovered spontaneous scalarization, which is non-perturbative strong-field phenomenon due to the presence of the gravitational scalar field, is well described in terms of the cusp catastrophe.
description: 17 pages, 9 postscript figures. Accepted for publication in Physical Review D
Brisinga Asbjornsen 1856
Creators: name: Mah, Christopher L.
Publisher: name: Zenodo
Year: 2022
Subjects: Biodiversity
Taxonomy
Animalia
Echinodermata
Asteroidea
Brisingida
Brisingidae
Brisinga

description: Brisinga Asbjørnsen 1856
Asbjørnsen 1856: 95; Fisher 1919: 515, 1928: 7; Downey 1986: 4; Clark & Downey 1992: 463. (see Clark & Downey 1992 for full synonymy)
 Diagnosis. Arms 7–14. Papulae absent. Abactinal disk plates with short spinelets. As with all Brisingidae, arm plates arranged in costae or ribs along arms, separated by thick skin. Adambulacral plates form adoral carina also referred to as “united interradially by syzygy.” Gonads serial.
description: Published as part of Mah, Christopher L., 2022, New Genera, Species and Occurrences of Deep-Sea Asteroidea (Valvatacea, Forcipulatacea, Echinodermata) collected from the North Pacific Ocean by the CAPSTONE Expedition, pp. 1-75 in Zootaxa 5164 (1) on page 12, DOI: 10.11646/zootaxa.5164.1.1, http://zenodo.org/record/6821026
Financial Fragility And Economic Performance
Creators: name: Bernanke, Ben
name: Gertler, Mark
name: Bernanke, Ben
name: Gertler, Mark
Publisher: name: Unknown
Year: 1987
Subjects: Research Methods/ Statistical Methods

description: Applied macroeconomists (e.g., Eckst~in and Sinai (1986)) have stressed the role of financial variables, such as firm balance sheet positions, in the determination of investment spending and output. Our paper presents a formal analysis of this link. We develop a model of the process of investment finance in which there is asymmetric information between borrowers and lenders about the quality of investment projects and about the borrower's effort. In this model, the cost of external investment finance under the optimal contract is higher, the worse the borrower's balance sheet position (i.e., the lower his net worth). In general equilibrium, the lower is borrower net worth, the further the number of projects initiated and the average quality of undertaken projects will be from the unconstrained first-best. We characterize a "financially fragile" situation as one in which balance sheets are so weak that the economy experiences substantial underinvestment, misallocation of investment resources, and possibly even a complete investment collapse. Our policy analysis suggests that, under some circumstances, government "bailouts" of insolvent debtors may be a reasonable alternative in periods of extreme financial fragility.
Two-color multistep cascading and parametric soliton-induced waveguides
Creators: name: Kivshar, Yuri S.
name: Sukhorukov, Andrey A.
name: Saltiel, Solomon M.
Publisher: name: arXiv
Year: 1999
Subjects: subject: Pattern Formation and Solitons (nlin.PS)
subject: FOS: Physical sciences

description: We introduce the concept of two-color multistep cascading for vectorial parametric wave mixing in optical media with quadratic (second-order or chi-2) nonlinear response. We demonstrate that the multistep cascading allows light-guiding-light effects with quadratic spatial solitons. With the help of the so-called `almost exact' analytical solutions, we describe the properties of parametric waveguides created by two-wave quadratic solitons.
description: 4 pages, 3 figures (updated references)
Full-3D relativistic MHD simulations of Bow Shock Pulsar Wind Nebulae: dynamics
Creators: name: Olmi, Barbara
name: Bucciantini, Niccolo'
Publisher: name: arXiv
Year: 2019
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Bow shock pulsar wind nebulae (BSPWNe) are know to show a large variety of shapes and morphologies, both when comparing different objects, and for the same object in different energy bands. It is unclear if such a variety is related to differences in the pulsar wind properties, or to differences in the conditions of the ambient medium. We present here a set of full three-dimensional, relativistic and magneto-hydrodynamic simulations of BSPWNe, with the intention of determining how differences in the injection conditions by the pulsar wind reflect in the nebular dynamics. To achieve a good coverage of the available parameter space we have run several simulations varying those parameters that are most representative of the wind properties: the latitudinal anisotropy of the wind energy flux with respect to the pulsar spin axis, the level of magnetization, the inclination of the pulsar spin axis with respect to the pulsar direction of motion. We have followed the dynamics in these systems, not just in the very head, but also in the tail, trying to assess if and how the system retains memory of the injection at large distances from the pulsar itself. In this paper we focus our attention on the characterization of the fluid structure and magnetic field properties. We have tried to evaluate the level of turbulence in the tail, and its relation to injection, the survival of current sheets, and the degree of mixing between the shocked ambient medium and the relativistic pulsar wind material.
description: 17 pages, 18 figures, 1 table
A hybrid iterated local search algorithm with adaptive perturbation mechanism by success-history based parameter adaptation for differential evolution (SHADE)
Creators: name: Fuqing Zhao
name: He, Xuan
name: Guoqiang Yang
name: Weimin Ma
name: Zhang, Chuck
name: Houbin Song
Publisher: name: Taylor & Francis
Year: 2019
Subjects: subject: Space Science
subject: Evolutionary Biology
subject: FOS: Biological sciences
subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: Ecology
subject: 69999 Biological Sciences not elsewhere classified
subject: 80699 Information Systems not elsewhere classified
subject: FOS: Computer and information sciences
subject: 19999 Mathematical Sciences not elsewhere classified
subject: FOS: Mathematics

description: The iterated local search (ILS) is exceptionally successful in combinatorial solution spaces. However, few research works have reported on the application of ILS in continuous problems. In this article, a new hybrid population-based iterated local search (HILS) algorithm is proposed for solving numerical optimization problems. The proposed hybrid method introduces both success-history based parameter adaptation for differential evolution (SHADE) and limited-memory Broyden–Fletcher–Goldfarb–Shanno (LBFGS) as the perturbation and local search strategy, respectively, and integrates the benefits of exploration capability of SHADE and local search performance of LBFGS. The simulated annealing type of acceptance criterion is adopted to balance the exploration and exploitation of ILS. The proposed HILS is tested against the CEC2017 benchmark functions, which were used to evaluate the performance of the proposed algorithm in solving numerical optimization problems. The experimental results show the effectiveness and efficiency of the HILS.
On The Perpetuation Of Unemployment, Undernourishment And Inequiable Land Ownership In Dynamic General Equilibrium
Creators: name: Ray, Debraj
name: Streufert, Peter A.
name: Ray, Debraj
name: Streufert, Peter A.
Publisher: name: Unknown
Year: 1987
Subjects: Research Methods/ Statistical Methods

description: We incorporate the consumption-ability relationship of static "efficiency wage" models into a dynamic general equilibrium model. We show that for many aggregate land stocks, there is a continuum of unemployment rates which could persist indefinitely as part of a stationary equilibrium. For many of these aggregate land stocks, both unemployment and full employment are distinct possibilities. Broadly speaking, more unemployment corresponds to more undernourishment and more inequality in land distribution. Thus our results suggest that the market mechanism is less efficacious than land reform in reducing unemployment and undernourishment.
Tripoli’s Integrated Development Strategy
Creators: El Rassi, Chaouki
Publisher: name: Columbia University
Year: 2019
Subjects: City planning
Land use, Urban
Community development, Urban
Community development, Urban--Planning

description: This study aims at formulating an integrated neighborhood plan for Dam w Farez, a recently subdivided area of the city of Tripoli, Lebanon. It seeks to address citywide issues—poverty, inadequate infrastructure, unemployment, traffic, and religious segregation—through zoning ordinances and policies. The research explores the previous studies that were conducted in the city, and describes the data collection process. Qualitative interviews were conducted in order to get a complete understanding of the city’s issues and the forces guiding development in the neighborhood. Green zoning ordinances, as well as land use recommendations and suggestions of public private partnerships were found to be ideal proposals for the municipality.
The Development of Altruistic Motivation in Early-Career Social Workers
Creators: name: Pazer, Sora
Publisher: name: figshare
Year: 2025
Subjects: classificationCode: 440999
subject: Social work not elsewhere classified
classificationCode: 520505
subject: Social psychology

description: Altruistic motivation plays a pivotal role in the effectiveness and sustainability of social work practice. This study examines the development of altruistic attributes—empathy, intrinsic motivation, resilience, and systemic understanding—among early-career social workers (N = 87) with 3–5 years of experience. Using quantitative methods, the research identifies significant positive trends and highlights key correlations between these dimensions. The findings demonstrate that professional experiences foster the growth of empathy and intrinsic motivation while emphasizing the protective role of resilience and the critical importance of systemic understanding. Variations across employment sectors reveal unique challenges and opportunities, contributing to a nuanced understanding of professional development in social work. The discussion integrates these findings with existing literature and emphasizes the need for supportive environments to sustain altruistic motivation. Implications for education, policy, and future research are also explored.
Structure and stability of cold scalar-tensor black holes
Creators: name: Bronnikov, K. A.
name: Clément, G.
name: Constantinidis, C. P.
name: Fabris, J. C.
Publisher: name: arXiv
Year: 1998
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We study the structure and stability of the recently discussed spherically symmetric Brans-Dicke black-hole type solutions with an infinite horizon area and zero Hawking temperature, existing for negative values of the coupling constant $ω$. These solutions split into two classes: B1, whose horizon is reached by an infalling particle in a finite proper time, and B2, for which this proper time is infinite. Class B1 metrics are shown to be extendable beyond the horizon only for discrete values of mass and scalar charge, depending on two integers $m$ and $n$. In the case of even $m-n$ the space-time is globally regular; for odd $m$ the metric changes its signature at the horizon. All spherically symmetric solutions of the Brans-Dicke theory with $ω
description: 8 pages, Latex
Atheraster Mah 2022, nov. gen.
Creators: name: Mah, Christopher L.
Publisher: name: Zenodo
Year: 2022
Subjects: Biodiversity
Taxonomy
Animalia
Echinodermata
Asteroidea
Valvatida
Goniasteridae
Atheraster

description: Atheraster nov. gen.
 Etymology. The genus name is derived from the Greek ather - for “spike” alluding to the regular, prominent spines which serve to diagnose the genus.
 Diagnosis. Body strongly stellate (R/r=3.8-4.0) with arms, elongate and tapering. Abactinal arm plates twice to three times larger than those on the disk. Sharp, thorn-like spines present on all superomarginal and inferomarginal plates, forming regular series. Granules with pointed tips. Pedicellariae paddle-like. Furrow spine number, 8–15 in known species.
 Comments. The persistent presence of prominent spines along both the superomarginal and inferomarginal plate series, in addition to the enlarged arm plates relative to the disk plates further constrains the character distribution for two recognized species, suggesting a very different taxon than those observed in the otherwise similar Circeaster, which lacks spines but shares enlarged abactinal arm plates.
 Both species of Atheraster are known from abyssal depths (1000–3000 m) in the North Pacific. Although two species are described, many similar species were observed from in situ video which could represent further as yet undescribed species.
 Although clearly sharing characters with Circeaster, the spines, pedicellariae and smooth abactinal plates are also similar to those found in Calliaster and related taxa, such as Milteliphaster whereas the granulation in the Atheraster sp. described herein are similar to those seen in Hippasteria and Evoplosoma.
 Atheraster arandae (Mah 2006) is the type species for the genus.
 Included species: Atheraster arandae (Mah 2006), Atheraster symphoniae n. sp.
description: Published as part of Mah, Christopher L., 2022, New Genera, Species and Occurrences of Deep-Sea Asteroidea (Valvatacea, Forcipulatacea, Echinodermata) collected from the North Pacific Ocean by the CAPSTONE Expedition, pp. 1-75 in Zootaxa 5164 (1) on pages 25-26, DOI: 10.11646/zootaxa.5164.1.1, http://zenodo.org/record/6821026
First Empirical Constraints on the Low H$α$ Mass-Loss Rates of Magnetic O-Stars
Creators: name: Driessen, Florian A.
name: Sundqvist, Jon O.
name: Wade, Gregg A.
Publisher: name: arXiv
Year: 2018
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: A small subset of Galactic O-stars possess surface magnetic fields that alter the outflowing stellar wind by magnetically confining it. Key to the magnetic confinement is that it induces rotational modulation of spectral lines over the full EM domain; this allows us to infer basic quantities, e.g., mass-loss rate and magnetic geometry. Here, we present an empirical study of the H$α$ line in Galactic magnetic O-stars to constrain the mass fed from the stellar base into the magnetosphere, using realistic multi-dimensional magnetized wind models, and compare with theoretical predictions. Our results suggest that it may be reasonable to use mass-feeding rates from non-magnetic wind theory if the absolute mass-loss rate is scaled down according to the amount of wind material falling back upon the stellar surface. This provides then some empirical support to the proposal that such magnetic O-stars might evolve into heavy stellar-mass black holes (Petit et al. 2017)
description: 4 pages, 3 figures, IAU Symposium 346 proceedings
Two Kerr black holes with axisymmetric spins: An improved Newtonian model for the head-on collision and gravitational radiation
Creators: name: Araujo, Marcelo E.
name: Letelier, Patricio S.
name: Oliveira, Samuel R.
Publisher: name: arXiv
Year: 1997
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We present a semi-analytical approach to the interaction of two (originally) Kerr black holes through a head-on collision process. An expression for the rate of emission of gravitational radiation is derived from an exact solution to the Einstein's field equations. The total amount of gravitational radiation emitted in the process is calculated and compared to current numerical investigations. We find that the spin-spin interaction increases the emission of gravitational wave energy up to 0.2% of the total rest mass. We discuss also the possibility of spin-exchange between the holes.
description: 8 pages, RevTeX, 2 figures, psbox macro included
On the ordering of energy levels in homogeneous magnetic fields
Creators: name: Baumgartner, Bernhard
name: Seiringer, Robert
Publisher: name: arXiv
Year: 2000
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: We study the energy levels of a single particle in a homogeneous magnetic field and in an axially symmetric external potential. For potentials that are superharmonic off the central axis, we find a general ``pseudoconcave'' ordering of the ground state energies of the Hamiltonian restricted to the sectors with fixed angular momentum. The physical applications include atoms and ions in strong magnetic fields. There the energies are monotone increasing and concave in angular momentum. In the case of a periodic chain of atoms the pseudoconcavity extends to the entire lowest band of Bloch functions.
description: LaTeX2e, 14 pages
Trends and distribution of monthly water consumption in UBC Gage B Residence, 2010-2014
Creators: name: McGlenn, Stephen
Publisher: name: The University of British Columbia
Year: 2015

description: 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.”
Additional file 1 of Incorporating the voice of young people in mental health research: reflections from three lived experience advisory panels in Latin America
Creators: name: Hidalgo-Padilla, Liliana
name: Ramirez-Meneses, Daniela
name: Ariza-Salazar, Karen
name: Lucchetti, Santiago Cesar
name: Olivar, Natividad
name: Stanislaus Sureshkumar, Diliniya
name: Fung, Catherine
name: Brusco, Luis Ignacio
name: Gómez-Restrepo, Carlos
name: Uribe-Restrepo, José Miguel
name: Priebe, Stefan
name: Diez-Canseco, Francisco
Publisher: name: figshare
Year: 2025
Subjects: Medicine
Science Policy
Mental Health

description: Supplementary Material 1: Description of the OLA programme objectives and activities.
Soliton tunneling with sub-barrier kinetic energies
Creators: name: Gonzalez, J. A.
name: Bellorin, A.
name: Guerrero, L. E.
Publisher: name: arXiv
Year: 1999
Subjects: subject: Pattern Formation and Solitons (nlin.PS)
subject: FOS: Physical sciences

description: We investigate (theoretically and numerically) the dynamics of a soliton moving in an asymmetrical potential well with a finite barrier. For large values of the width of the well, the width of the barrier and/or the height of the barrier, the soliton behaves classically. On the other hand, we obtain the conditions for the existence of soliton tunneling with sub-barrier kinetic energies. We apply these results to the study of soliton propagation in disordered systems.
description: 6 eps figures. To appear in Physical Review E (Rapid Communications)
Tropical Cyclone Risk Assessment Using Statistical Models
Creators: Yonekura, Emmi
Publisher: name: Columbia University
Year: 2013
Subjects: subject: Atmosphere
subject: Statistics
subject: FOS: Mathematics
subject: Climatic changes

description: Tropical cyclones (TC) in the western North Pacific (WNP) pose a serious threat to the coastal regions of Eastern Asia when they make landfall. The limited amount of observational data and the high computational cost of running TC-permitting dynamical models indicate a need for statistical models that can simulate large ensembles of TCs in order to cover the full range of possible activity that results from a given climate change. I construct and apply a statistical track model from the 1945-2007 observed "best tracks" in the IBTrACS database for the WNP. The lifecycle components--genesis, track propagation, and death--of each simulated track is determined stochastically based on the statistics of historical occurrences. The length scale that dictates what historical data to consider as "local" for each lifecycle component is calculated objectively through optimization. Overall, I demonstrate how a statistical model can be used as a tool to translate climate-induced changes in TC activity into implications for risk.
In contrast to other studies, I show that the El Niño/Southern Oscillation (ENSO) has an effect on track propagation separate from the genesis effect. The ENSO effect on genesis results in higher landfall rates during La Niña years due to the shift in genesis location to the northeast. The effect on tracks is more geographically and seasonally varied due to local changes in the mid-level winds. I use local regression techniques to capture the relationship between ENSO, cyclogenesis, and track propagation. Stationary climate simulations are run for extreme ENSO states in order to better understand changes in TC activity and their implication for regional landfall. Additionally, Several diagnostics are performed on model realizations of the historical period, confirming the model's ability to capture the geographical distribution and interannual variability of observed TCs.
Lastly, as a step to connect synthetic TC track simulations to economic damage risk assessment, I use a Damage Index and total damage data for U.S. landfalling hurricanes and fit generalized Pareto distributions (GPD) to them. The Damage Index uniquely separates out the effects of the physical damage capacity of a TC and the local economic vulnerability of a coastal region. GPD fits are also performed using covariates in the scale parameter, where bathymetric slope and landfall intensity are found to be useful covariates for the Damage Index. Using the Damage Index with covariates model, two examples are shown of assessing damage risk for different climates. The first takes landfall data input from a statistical-deterministic TC model downscaled from GFDL and ECHAM model current and future climates. The second takes landfall data from a fully statistical track model with different values of relative sea surface temperature given as a statistical predictor.
Features of description of composite system's motion in twist-deformed space-time
Creators: name: Gnatenko, Kh. P.
Publisher: name: arXiv
Year: 2019
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Composite system made of $N$ particles is considered in twist-deformed space-time. It is shown that in the space the motion of the center-of-mass of the system depends on the relative motion. Influence of deformation on the motion of the center-of-mass of composite system is less than on the motion of individual particles and depends on the system's composition. We conclude that if we consider commutation relations for coordinates of a particle to be proportional inversely to its mass, the commutation relations for coordinates of composite system do not depend on its composition and are proportional inversely to system's total mass, besides the motion of the center-of-mass is independent of the relative motion. In addition we find that inverse proportionality of parameters of noncommutativity to mass is important for considering coordinates in twist-deformed space as kinematic variables and for preserving of the weak equivalence principle.
Tropical geometry of curves with large theta characteristics
Creators: Deopurkar, Ashwin
Publisher: name: Columbia University
Year: 2017
Subjects: subject: Mathematics
subject: FOS: Mathematics
subject: Tropical geometry
subject: Curves

description: In this dissertation we study tropicalization curves which have a theta characteristic with large rank. This fits in the more general framework of studying the limit linear series on a curve which degenerates to a singular curve. We explore this when the singular curve is not of compact type. In particular we investigate the case when dual graph of the degenerate curve is a chain of g-loops. The fundamental object under consideration is a family of curves over a complete discrete valuation ring. In the first half of the dissertation we study geometry of such a family. In the third chapter we study metric graphs and divisors on them. This could be a thought of as the theory of limit linear series on a curve of non-compact type. In the fourth chapter we make this connection via tropicalization. We consider a family of curves with smooth generic fiber X η of genus g such that the dual graph of the special fiber is a chain of g loops. The main theorem we prove is that if X η has a theta characteristic of rank r then there are at least r linear relations on the edge lengths of the dual graph.
Easy Monitored Entangled States
Creators: name: Can, M. A.
name: Klyachko, A. A.
name: Shumovsky, A. S.
Publisher: name: arXiv
Year: 2002
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We discuss the generation and monitoring of durable atomic entangled state via Raman-type process, which can be used in the quantum information processing.
description: 9 pages, 2 figures, the previous title "Durable Entanglement in Atomic Systems" is replaced by new title, accepted to Appl. Phys. Lett
The influence of storage relative humidity on aerosolization of co-spray dried powders of hygroscopic kanamycin with the hydrophobic drug rifampicin
Creators: name: Momin, Mohammad A. M.
name: Tucker, Ian G.
name: Das, Shyamal C.
Publisher: name: Taylor & Francis
Year: 2019
Subjects: subject: Biochemistry
subject: Space Science
subject: 29999 Physical Sciences not elsewhere classified
subject: FOS: Physical sciences
subject: Medicine
subject: Physiology
subject: FOS: Biological sciences
subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: 20199 Astronomical and Space Sciences not elsewhere classified
subject: Immunology
subject: FOS: Clinical medicine
subject: 69999 Biological Sciences not elsewhere classified

description: The purpose of this study was to investigate the influence of storage humidity on in vitro aerosolization and physicochemical properties of co-spray dried powders of kanamycin with rifampicin. The powders were stored for one-month in an open Petri dish at different relative humidities (RHs) (15%, 43%, and 75%) and 25 ± 2 °C. The in vitro aerosolization (fine particle fraction, FPF) of the powders was determined by a next generation impactor (NGI). The moisture content, particle morphology and crystallinity of the powders were determined by Karl Fischer titration, scanning electron microscopy, and X-ray powder diffractometry, respectively. At all RH, the FPF of hydrophobic rifampicin-only powder was unaffected but the FPF of hygroscopic kanamycin-only powder significantly decreased even at 43% RH. The kanamycin-only particles fused together, crystallized and formed hard cakes at 75% RH. The aerosolization of kanamycin and rifampicin in the combination powders remained unaffected at 15% and 43% RH, but aerosolization significantly decreased at 75% RH. Enrichment of the surface of the particles with hydrophobic rifampicin did not protect the combination powders from moisture uptake but it prevented particle agglomeration up to 43% RH. At 75% RH, the moisture uptake led to agglomeration of the particles of the combination powder particles and consequently an increase in aerodynamic diameter. Further studies are required to investigate how rifampicin enrichment prevents particle agglomeration, the possible mechanisms (e.g. particle interactions due to capillary forces or electrostatic forces) for the changes in the aerosolization and changes in surface composition during storage.
Microscopic Fields and Macroscopic Averages in Einstein's Unified Field Theory
Creators: name: Antoci, S.
Publisher: name: arXiv
Year: 1998
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The relation between microscopic and macroscopic entities in the generally covariant theories is considered, and it is argued that a sensible definition of the macroscopic averages requires a restriction of the allowed transformations of coordinates. Spacetime averages of the geometric objects of Einstein's unified field theory are then defined, and the reconstruction of some features of macroscopic reality from hypothetic microscopic structures is attempted. It is shown how a fluctuating microscopic behaviour of the metric field can rule the constitutive relation for electromagnetism both in vacuo and in nondispersive material media. Moreover, if both the metric and the skew tensor density that represents the electric displacement and the magnetic field are assumed to possess a wavy microscopic structure, nonvanishing generalized force densities can appear in the continuum. They originate from a resonance process, in which at least three waves need to be involved. This process only occurs if the wavevectors fulfil the three-wave resonance condition, so ubiquitous in quantum physics. The wavy behaviour of the metric is essential for the occurrence of this resonance phenomenon.
description: 22 pages, plain TeX
Probing the multi spin-phonon coupling and local B-site disorder in Pr2CoFeO6 by Raman spectroscopy and correlation with its electronic structure by X-ray photoemission spectroscopy
Creators: name: Pal, Arkadeb
name: Ghosh, Surajit
name: Joshi, Amish G.
name: Gupta, P. K.
name: Prakash, P.
name: Das, Amitabh
name: Ghosh, A. K.
name: Chatterjee, Sandip
Publisher: name: arXiv
Year: 2019
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Electronic structure near Fermi level of Pr2CoFeO6 (at 300 K) was investigated by X-ray photoemission spectroscopy (XPS) technique. All three cations, i.e., Pr, Co and Fe were found to be trivalent in nature. XPS analysis also suggested the system to be insulating in nature. Moreover, Raman spectroscopy study indicated the random distribution of the B-site ions (Co/Fe) triggered by same charge states. In temperature-dependent Raman study, the relative heights of the two observed phonon modes exhibited anomalous behaviour near magnetic transition temperature TN~270 K, thus indicating towards interplay between spin and phonon in the system. Furthermore, clear anomalous softening was observed below TN which confirmed the existence of strong spin-phonon coupling occurring for at least two phonon modes of the system. The line width analysis of the phonon modes essentially ruled out the role of magnetostriction effect in the observed phonon anomaly. The investigation of the lattice parameter variation across TN (obtained from the temperature-dependent neutron diffraction measurements) further confirmed the existence of the spin-phonon coupling.
Tropical rainforests getting their fix: The ecological drivers and consequences of nitrogen-fixing trees in regenerating Costa Rican rainforests
Creators: Taylor, Benton Neil
Publisher: name: Columbia University
Year: 2018
Subjects: subject: Ecology
subject: FOS: Biological sciences
subject: Nitrogen-fixing trees
subject: Rain forests
subject: Forest regeneration
subject: Rain forest ecology

description: Tropical rainforests have an unparalleled capacity to sequester carbon, harbor biodiversity, and cycle water and nutrients due to their high rates of primary production.  The large biomass stocks and rapid regeneration rates of these forests are often attributed to ample soil nitrogen and quick recovery of the nitrogen cycle in tropical soils following disturbance. Symbiotic nitrogen-fixing trees, which are relatively abundant at tropical latitudes, have the greatest capacity to provide tropical rainforests with new nitrogen, yet the ecological drivers of tropical symbiotic nitrogen fixers and their effects on the forests they inhabit are not well understood. This dissertation consists of four chapters that examine the patterns, environmental controls, and ecological consequences of symbiotic nitrogen-fixing trees in regenerating and intact rainforests in the Caribbean lowlands of Costa Rica. In chapter 1, I use field sampling in a chronosequence of rainforest plots to show that symbiotic nitrogen fixation declines through succession despite increases in the basal area of nitrogen-fixing trees. Chapters 2 and 3 describe results from a controlled shadehouse experiment assessing the effects of light, soil nitrogen, and plant competition on nitrogen fixation rates and the growth and biomass allocation of nitrogen fixers and non-fixers. In chapter 2, I demonstrate that light regulates nitrogen fixation more strongly than soil nitrogen availability. This is a departure from the historical focus on soil nitrogen as the primary regulator of nitrogen fixation and has the potential to resolve longstanding paradoxes of tropical nitrogen cycling. In chapter 3, I show that nitrogen fixation provides some resistance to competitive effects from neighboring plants in nitrogen-limited conditions, and that nitrogen fixers in these conditions downregulate their fixation rates in the presence of a competitor. This chapter also demonstrates that nitrogen fixation does not represent a significant structural cost to the plant, as reduced root biomass of nitrogen fixers more than compensates for allocation to nodule production. Finally, in Chapter 4, I demonstrate that nitrogen-fixing trees in our chronosequence plots do not promote forest growth, as expected given their capacity to fertilize their neighbors, but rather inhibit forest growth because they are strong competitors. These chapters describe several unexpected findings – i.e. that light primarily drives nitrogen fixation and that nitrogen fixers slow forest growth – which provide new and important insight into the role that nitrogen-fixing trees play in the growth of Costa Rican rainforests.
Bathyceramaster Mah 2016
Creators: name: Mah, Christopher L.
Publisher: name: Zenodo
Year: 2022
Subjects: Biodiversity
Taxonomy
Animalia
Echinodermata
Asteroidea
Valvatida
Goniasteridae
Bathyceramaster

description: Bathyceramaster Mah 2016a
Mah 2016a: 105
 Diagnosis. Abactinal plates tabulate, low to moderate in height with fasciolar grooves, variably shallow to well-developed, plates lacking stellate bases. Abactinal, marginal, actinal surfaces covered by densely arranged polygonal to round granules. Body stellate, many species with well-developed arms (R/ r=1.8–4.0).
 Comments. This genus was created to accommodate Mediaster elegans Ludwig 1905, which lacked the stellate, radiating ossicles that are present in all species belonging to the genus Mediaster (Fisher 1911; Mah 2016a). The tabular plates and well developed fasciolar grooves were also not as well-developed in Bathyceramaster as they are in Mediaster. Known Bathyceramaster spp. have only been reported from relatively deep-water settings, below 600 m, primarily between 1000–4000 m.
 Based on the occurrence of known species, Bathyceramaster occurs widely throughout the Pacific in a manner similar to other deep-sea Goniasteridae, such as Sibogaster (Mah 2016a).
description: Published as part of Mah, Christopher L., 2022, New Genera, Species and Occurrences of Deep-Sea Asteroidea (Valvatacea, Forcipulatacea, Echinodermata) collected from the North Pacific Ocean by the CAPSTONE Expedition, pp. 1-75 in Zootaxa 5164 (1) on page 31, DOI: 10.11646/zootaxa.5164.1.1, http://zenodo.org/record/6821026