cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
One-particle and excitonic band structure in cubic Boron Arsenide
Creators: name: Acharya, Swagata
name: Pashov, Dimitar
name: Katsnelson, Mikhail I
name: van Schilfgaarde, Mark
Publisher: name: arXiv
Year: 2023
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Cubic BAs has received recent attention for its large electron and hole mobilities and large thermal conductivity. This is a rare and much desired combination in semiconductor industry: commercial semiconductors typically have high electron mobilities, or hole mobilities, or large thermal conductivities, but not all of them together. Here we report predictions from an advanced self-consistent many body perturbative theory and show that with respect to one-particle properties, BAs is strikingly similar to Si. There are some important differences, notably there is an unusually small variation in the valence band masses . With respect to two-particle properties, significant differences with Si appear. We report the excitonic spectrum for both q=0 and finite q, and show that while the direct gap in cubic BAs is about 4 eV, dark excitons can be observed down to about $\sim$1.5 eV, which may play a crucial role in application of BAs in optoelectronics.
description: 4 pages, 2 figures
Compositional Freeze-Out of Neutron Star Crusts
Creators: name: Hoffman, Kelsey
name: Heyl, Jeremy
Publisher: name: arXiv
Year: 2009
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We have investigated the crustal properties of neutron stars without fallback accretion. We have calculated the chemical evolution of the neutron star crust in three different cases (a modified Urca process without the thermal influence of a crust, a thick crust, and a direct Urca process with a thin crust) in order to determine the detailed composition of the envelope and atmosphere as the nuclear reactions freeze out. Using a nuclear reaction network up to technetium, we calculate the distribution of nuclei at various depths of the neutron star. The nuclear reactions quench when the cooling timescale is shorter than the inverse of the reaction rate. Trace light elements among the calculated isotopes may have enough time to float to the surface before the layer crystallizes and form the atmosphere or envelope of the neutron star. The composition of the neutron-star envelope determines the total photon flux from the surface, and the composition of the atmosphere determines the emergent spectrum. Our calculations using each of the three cooling models indicate that without accretion of fallback the neutron star atmospheres are dependent on the assumed cooling process of the neutron star. Each of the cooling methods have different elements composing the atmosphere: for the modified Urca process the atmosphere is $^{28}$Si, the thick crust has an atmosphere of $^{50}$Cr, and the thin crust has an atmosphere of $^{40}$Ca. In all three cases the atmospheres are composed of elements which are lighter then iron.
description: 6 pages, 5 figures, accepted to MNRAS
Perturbation of nonlinear Dirichlet problems
Creators: name: Fournier, David Anthony
Publisher: name: University of British Columbia
Year: 2010

description: The solutions of weakly-formulated non-linear Dirichlet problems are studied when the data of the problem are perturbed in various ways. The data which undergo perturbations include the Lagrangian, the boundary condition, the basic domain, and the constraints, if present. The main conclusion states that the solution of the Dirichlet problem which minimizes the Dirichlet integral varies continuously with the data so long as it is unique. Detailed hypotheses are formulated to insure the validity of this conclusion for several large classes of problem. The hypotheses are not much stronger than the standard sufficient conditions for existence, in the generalized Lusternik-Schnirelman theory of these problems.
Structure function of the UV variability of Q0957+561
Creators: name: Goicoechea, L. J.
name: Shalyapin, V. N.
name: Gil-Merino, R.
name: Ullán, A.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present a detailed structure function analysis of the UV variability of Q0957+561. From new optical observations, we constructed normalized structure functions of the quasar luminosity at restframe wavelengths of 2100 and 2600 Å. Old optical records also allow the structure function to be obtained at 2100 Å, but 10 years ago in the observer's frame. These three structure functions are then compared to predictions of both simple and relatively sophisticated (incorporating two independent variable components) Poissonian models. We do not find clear evidence of a chromatic mechanism of variability. From the recent data, 100-d time-symmetric and 170-d time-asymmetric flares are produced at both restframe wavelengths. Taking into account measurements of time delays and the existence of an EUV/radio jet, reverberation is probably the main mechanism of variability. Thus, two types of EUV/X-ray fluctuations would be generated within or close to the jet and later reprocessed by the disc gas in the two emission rings. The 100-d time-symmetric shots are also responsible for most of the 2100 Åvariability detected in the old experiment. However, there is no evidence of asymmetric shots in the old UV variability. If reverberation is the involved mechanism of variability, this could mean an intermittent production of high-energy asymmetric fluctuations. The old records are also consistent with the presence of very short-lifetime (10 d) symmetric flares, which may represent additional evidence of time evolution. We also discuss the quasar structure that emerges from the variability scenario.
description: 7 pages, 4 figures. Accepted for publication in A&A (based on the brightness records at http://arxiv.org/abs/0810.4619)
Future prospects of B physics
Creators: name: Grossman, Yuval
name: Ligeti, Zoltan
name: Nir, Yosef
Publisher: name: arXiv
Year: 2009
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: In recent years, the CKM picture of flavor and CP violation has been confirmed, mainly due to B decay data. Yet, it is likely that there are small corrections to this picture. We expect to find new physics not much above the weak scale. This new physics could modify flavor changing processes compared to their SM expectations. Much larger B decay data sets, which are expected from LHCb and super-$B$-factories, will be used to search for these deviations with much improved sensitivity. The combination of low and high energy data will be particularly useful to probe the structure of new physics.
description: 19 pages. To appear in the Progress of Theoretical Physics special issue commemorating Kobayashi and Maskawa Nobel prize. v2: references added. Final version to appear in the journal
Retrieval survey of metals in six ultra-hot Jupiters: Trends in chemistry, rain-out, ionisation and atmospheric dynamics
Creators: name: Gandhi, Siddharth
name: Kesseli, Aurora
name: Zhang, Yapeng
name: Louca, Amy
name: Snellen, Ignas
name: Brogi, Matteo
name: Miguel, Yamila
name: Casasayas-Barris, Núria
name: Pelletier, Stefan
name: Landman, Rico
name: Maguire, Cathal
name: Gibson, Neale P.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: Ground-based high-resolution spectroscopy (HRS) has detected numerous chemical species and atmospheric dynamics in exoplanets, most notably ultra-hot Jupiters (UHJs). However, quantitative estimates on abundances have been challenging but are essential for accurate comparative characterisation and to determine formation scenarios. In this work we retrieve the atmospheres of six UHJs (WASP-76~b, MASCARA-4~b, MASCARA-2~b, WASP-121~b, HAT-P-70~b and WASP-189~b) with ESPRESSO and HARPS-N/HARPS observations, exploring trends in eleven neutral species and dynamics. While Fe abundances agree well with stellar values, Mg, Ni, Cr, Mn and V show more variation, highlighting the difficulty in using a single species as a proxy for metallicity. We find that Ca, Na, Ti and TiO are under-abundant, potentially due to ionisation and/or night-side rain-out. Our retrievals also show that relative abundances between species are more robust, consistent with previous works. We perform spatially- and phase-resolved retrievals for WASP-76~b and WASP-121~b given their high signal-to-noise observations, and find the chemical abundances in each of the terminator regions are broadly consistent. We additionally constrain dynamics for our sample through Doppler shifts and broadening of the planetary signals during the primary eclipse, with median blue shifts between $\sim$0.9-9.0~km/s due to day-night winds. Furthermore, we constrain spectroscopic masses for MASCARA-2~b and HAT-P-70~b consistent with their known upper limits, but we note that these may be biased due to degeneracies. This work highlights the importance of future HRS studies to further probe differences and trends between exoplanets.
description: 26 pages, 11 figures, 5 tables, published in AJ
On deformation of electron holes in phase space
Creators: name: Treumann, R. A.
name: Jaroschek, C. H.
name: Pottelette, R.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Space Physics (physics.space-ph)
subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: This Letter shows that for particularly shaped background particle distributions momentum exchange between phase space holes and the distribution causes acceleration of the holes along the magnetic field. In the particular case of a non-symmetric ring distribution (ring with loss cone) this acceleration is nonuniform in phase space being weaker at larger perpendicular velocities thus causing deformation of the hole in phase space.
description: Original MS in EPL style, 1 Figure
title: Análisis del rendimiento de la CT-Colonografía asociada a colonoscopia óptica en 200 pacientes con sospecha de carcinoma colorrectal.
Creators: name: de Lara Bendahan, Victoria
Publisher: name: Sociedad Española de Radiología Médica
Year: 2014
Subjects: subject: Neoplasia
subject: Colonography CT
subject: CT
subject: Colon
subject: Abdomen

description: Objetivos
Material y método
Resultados
Conclusiones
Bibliografía
description: Objetivos:
Los objetivos de este trabajo son: Analizar la utilidad de la CT-Colonografia como complemento a la colonoscopia óptica incompleta. Describir el valor de la CTC en casos de carcinoma colorrectal estenosante. Caracterizar las lesiones encontradas...
The Araucaria Project: Improving the cosmic distance scale
Creators: name: Project, The Araucaria
name: :
name: Pietrzyński, G.
name: Gieren, W.
name: Karczmarek, P.
name: Górski, M.
name: Zgirski, B.
name: Wielgórski, P.
name: Breuval, L.
name: Suchomska, K.
name: Gallenne, A.
name: Kervella, P.
name: Hajdu, G.
name: Pilecki, B.
name: Storm, J.
name: Nardetto, N.
name: Kudritzki, R. P.
name: Taormina, M.
name: Bresolin, F.
name: Smolec, R.
name: Narloch, W.
name: Gałan, C.
name: Lewis, M.
name: Chini, R.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: The book consists of a number of short articles that present achievements of the Araucaria members, collaborators, and friends, in various aspects of distance determinations and related topics. It celebrates the 20-year anniversary of the Araucaria Project, acknowledges the people who worked for its success, and popularises our methods and results among broader readership. This book is a part of a project that has received funding from the European Union's Horizon 2020 research and innovation programme under grant agreement No 695099.
description: 114 pages, book published in 2021 on behalf of the Nicolaus Copernicus Astronomical Center of the Polish Academy of Sciences, to celebrate 20 years of the Arauria Project
Transverse energy distributions at mid-rapidity in p+p, d+Au and Au+Au collisions at 62.4-200 GeV and implications for particle production models
Creators: name: Tannenbaum, Michael
Publisher: name: Zenodo
Year: 2021
Subjects: qm14
phenix
p+p
d+au
au+au
transverse energy
centrality
multiplicity
quark

description: Talk presented at the Quark Matter 2014 conference
The calculation of effective stiffness and elasticity modulus of different types of wood on the basis of measurements of free vibrations
Creators: name: Misztal, Barbara
Publisher: name: Faculty of Architecture, Wrocław University of Technology, Wrocław
Year: 2014
Subjects: dynamics, frequency of vibrations, absorption, logarithmic absorption decrement, effective stiffness, effective elasticity module

description: ARCHITECTUS; ISSN 1429-7507
Phase behavior of ditethered nanospheres
Creators: name: Iacovella, Christopher R.
name: Glotzer, Sharon C.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: We report the results from a computational study of the self-assembly of amphiphilic ditethered nanospheres using molecular simulation. We explore the phase behavior as a function of nanosphere diameter, interaction strength, and directionality of the tether-tether interactions. We predict the formation of seven distinct ordered phases. We compare these structures with those observed in linear and star triblock copolymer systems.
description: 8 pages, 9 figures
Combination of Tevatron searches for the standard model Higgs boson in the W+W- decay mode
Creators: name: CDF, The
name: Collaborations, the D0
name: :
name: Aaltonen, T.
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: We combine searches by the CDF and D0 collaborations for a Higgs boson decaying to W+W-. The data correspond to an integrated total luminosity of 4.8 (CDF) and 5.4 (D0) fb-1 of p-pbar collisions at sqrt{s}=1.96 TeV at the Fermilab Tevatron collider. No excess is observed above background expectation, and resulting limits on Higgs boson production exclude a standard-model Higgs boson in the mass range 162-166 GeV at the 95% C.L.
description: 11 pages, 4 figures. Published in Phys. Rev. Lett, along with two accompanying letters, one from CDF and one from D0, describing the H->WW searches which are combined here
The H alpha Galaxy Survey. VIII. Close companions and interactions, and the definition of starbursts
Creators: name: Knapen, Johan H.
name: James, Philip A.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: (Shortened) We consider the massive star formation properties, radial profiles, and atomic gas masses of those galaxies in our H alpha Galaxy Survey, a representative sample of the local Universe of 327 disk galaxies, that have close companion galaxies, in comparison with a matched control sample of galaxies without companions. We find that the presence of a close companion raises the star formation rate by a factor of just under two, while increasing hardly at all the equivalent width of the H alpha emission. This means that although statistically galaxies with close companions form stars at a higher rate, they do this over extended periods of time, and not as bursts. We find no significant increase in the central concentration of the star formation as a result of the presence of a close companion. The fraction of truly interacting or merging galaxies is very small in the local Universe, at around 2%, and possibly 4% of bright galaxies. Most of these interacting galaxies currently have unremarkable star formation properties. We also study the properties of the Survey galaxies with the most extreme values for star formation indicators such as rate, equivalent width, star formation rate per area, and gas depletion timescale. We find that each of these indicators favors a different subset of galaxies, and use this information to discuss critically the possible definitions of the term starburst to describe galaxies with enhanced star formation activity. We conclude that no one starburst definition can be devised which is objective and generally discriminant. Unless one restricts the use of the term "starburst" to a very small number of galaxies, the term will continue to be used for a heterogeneous and wide-ranging collection of objects with no physical basis for their classification as starburst.
description: ApJ, in press (June 20, 2009 issue). With HaGS Paper VII (James, Bretherton, and Knapen 2009, arXiv:0904.4261), this paper concludes the H alpha Galaxy Survey
Cosmic Superstrings: Dynamics and Cusps
Creators: name: Nelson, William
Publisher: name: arXiv
Year: 2009
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Whilst standard field theoretic Cosmic Strings cannot end, Cosmic Superstrings can form three string junctions, at which each string ends. This opens up a new class of possible boundary conditions for such strings and we show that, at least when the junctions are close together, a string ending of two such junctions will generically have cusps. Cusps are of particular interest as they are strong emitters of radiation (both gravitational and particle) and hence are possible observables. The detection of cusps from Cosmic Superstrings between junctions would be a rare observational window into the realm of String theory and Brane inflation models.
description: AIP Proceedings of the "Invisible Universe" conference, Palais de l'Unesco, Paris, 29 June - 4 July 2009
Ferromagnetism in armchair graphene nanoribbon
Creators: name: Lin, Hsiu-Hau
name: Hikihara, Toshiya
name: Jeng, Horng-Tay
name: Huang, Bor-Luen
name: Mou, Chung-Yu
name: Hu, Xiao
Publisher: name: arXiv
Year: 2009
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Due to the weak spin-orbit interaction and the peculiar relativistic dispersion in graphene, there are exciting proposals to build spin qubits in graphene nanoribbons with armchair boundaries. However, the mutual interactions between electrons are neglected in most studies so far and thus motivate us to investigate the role of electronic correlations in armchair graphene nanoribbon by both analytical and numerical methods. Here we show that the inclusion of mutual repulsions leads to drastic changes and the ground state turns ferromagnetic in a range of carrier concentrations. Our findings highlight the crucial importance of the electron-electron interaction and its subtle interplay with boundary topology in graphene nanoribbons. Furthermore, since the ferromagnetic properties sensitively depends on the carrier concentration, it can be manipulated at ease by electric gates. The resultant ferromagnetic state with metallic conductivity is not only surprising from an academic viewpoint, but also has potential applications in spintronics at nanoscale.
description: 10 pages, 5 figures
O'ZBEKISTON RESPUBLIKASIDA AYRIM HUDUDLARNING RANG NOMLARI BILAN ATALISHINING LINGVISTIK AHAMIYATI
Creators: name: Ismatova, Nodiraxon
Publisher: name: Zenodo
Year: 2023

description: Tilshunoslik va toponimika sohalarini bir biriga chambarchas bog’liq ekanligini hech ikkilanmay aytishimiz mumkin. Har bir narsa predmetning o’z xususiyatidan kelib chiqib unga nom beriladi. Shu bilan birga joy nomlarga ham. Ushbu maqolada O’zbekiston xudididagi ayrim joy nomlarining rang nomlari bilan atalishi va ularning lingvistik tahlili haqida fikr yuritiladi. Shuningdek, maqolada Qiziltepa va Oqtepa nomlariga ham alohida e’tibor qaratilgan
Ising t-J model close to half filling: A Monte Carlo study
Creators: name: Maska, M. M.
name: Mierzejewski, M.
name: Ferraz, A.
name: Kochetov, E. A.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: Within the recently proposed doped-carrier representation of the projected lattice electron operators we derive a full Ising version of the t-J model. This model possesses the global discrete Z_2 symmetry as a maximal spin symmetry of the Hamiltonian at any values of the coupling constants, t and J. In contrast, in the spin anisotropic limit of the t-J model, usually referred to as the t-J_z model, the global SU(2) invariance is fully restored at J_z=0, so that only the spin-spin interaction has in that model the true Ising form. We discuss a relationship between those two models and the standard isotropic t-J model. We show that the low-energy quasiparticles in all three models share the qualitatively similar properties at low doping and small values of J/t. The main advantage of the proposed Ising t-J model over the t-J_z one is that the former allows for the unbiased Monte Carlo calculations on large clusters of up to 10^3 sites. Within this model we discuss in detail the destruction of the antiferromagnetic order by doping as well as the interplay between the AF order and hole mobility. We also discuss the effect of the exchange interaction and that of the next nearest neighbour hoppings on the destruction of the AF order at finite doping. We show that the short-range AF order is observed in a wide range of temperatures and dopings, much beyond the boundaries of the AF phase. We explicitly demonstrate that the local no double occupancy constraint plays the dominant role in destroying the magnetic order at finite doping. Finally, a role of inhomogeneities is discussed.
description: 24 pages, 10 figures
Solutions of a particle with fractional $δ$-potential in a fractional dimensional space
Creators: name: Muslih, Sami I.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Mathematical Physics (math-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: A Fourier transformation in a fractional dimensional space of order $\la$ ($00$ and $δ^{\la}(x)$ is the fractional Dirac delta function. A complete solutions for the energy values and the wave functions are obtained in terms of the Fox H-functions. It is demonstrated that the eigen solutions are exist if $0< \la
Quantum State Transfer Between Distant Optomechanical Interfaces via Shortcut to Adiabaticity
Creators: name: Xi, Hanzhe
name: Pei, Pei
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We propose a protocol to realize fast high-fidelity quantum state transfer between distant optomechanical interfaces connected by a continuum waveguide. The scheme consists of three steps: two accelerating adiabatic processes joined by a population conversion process. In comparison to the traditional adiabatic technique, our method reaches a higher transfer fidelity with a shorter time. Numerical results show that the fidelity of this transfer scheme in the dissipative system mainly depends on the protocol speed and the coupling strength of the waveguide and cavities. Assisted by inverting the pulse sequence, a bidirectional transfer can be implemented, indicating the potential to build a quantum network.
description: 7 pages, 3 figures
Numerical simulation of ion transport through ion channels and solid-state nanopores
Creators: name: Berti, Claudio <1981>
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2011
Subjects: ING-INF/01 Elettronica

description: Ion channels are pore-forming proteins that regulate the flow of ions across biological cell membranes. Ion channels are
fundamental in generating and regulating the electrical activity of cells in the nervous system and the contraction of muscolar cells. Solid-state nanopores are nanometer-scale pores located in electrically insulating membranes. They can be adopted as detectors of specific molecules in electrolytic solutions. Permeation of ions from one electrolytic solution
to another, through a protein channel or a synthetic pore is a process of considerable importance and realistic analysis
of the main dependencies of ion current on the geometrical and compositional characteristics of these structures are highly
required.
The project described by this thesis is an effort to improve the understanding of ion channels by devising methods for computer simulation that can predict channel conductance from channel structure. This project describes theory, algorithms and implementation techniques used to develop a novel 3-D numerical simulator of ion channels and synthetic nanopores based on the Brownian Dynamics technique. This numerical simulator could represent a valid tool for the study of protein ion channel and synthetic nanopores, allowing to investigate at the atomic-level the complex electrostatic interactions that determine channel conductance and ion selectivity. Moreover it will provide insights on how parameters like temperature, applied voltage, and pore shape could influence ion translocation dynamics. Furthermore it will help making predictions of conductance of given channel structures and it will add information like electrostatic potential or ionic concentrations throughout the simulation domain helping the understanding of ion flow through membrane pores.
Quantifying Properties of the QCD Matter at RHIC
Creators: name: Huang, Huan Zhong
Publisher: name: arXiv
Year: 2009
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: We will review recent results on quantitative description of global properties of bulk partonic matter at RHIC. These results include strangeness phase space factor of the partonic matter, azimuthal angular anisotropy $v_2$, and transverse momentum $p_T$ distributions of effective partons at the hadronization of bulk partonic matter. We present empirical constraints on parton energy loss in the high $p_T$ region ($>$ 5 GeV/c). A flat $R_{AA}$ as a function of $p_T$ at mid-rapidity implies a constant fraction of the parton energy loss ($Δp_T/p_T$) and the fraction reaches 25% for neutral $π$, charged hadrons and non-photonic electrons of heavy quark decays from central Au+Au collisions at $\sqrt{s_{NN}}$ 200 GeV. Collision centrality dependence of $Δp_T/p_T$ from Au+Au and Cu+Cu collisions indicates that the fraction is approximately proportional to particle rapidity density $dn/dy$ divided by the initial transverse overlapping area of the colliding nuclei. Implications on dynamics of parton energy loss will be discussed.
description: To Appear in SQM2008 Conference Proceedings
PHENIX overview
Creators: name: He, Xiaochun
Publisher: name: Zenodo
Year: 2021
Subjects: qm14
phenix
au+au
direct photon
thermal photon
scaling
azimuthal
anisotropy
elliptic
flow
small systems
d+au
hbt
heavy flavor
dielectron
dimuon
charm
J/Ψ
raa
nuclear
modification
cu+au
bottom

description: Talk presented at the Quark Matter 2014 conference
Removal performance and dissolved organic matter biodegradation characteristics in advection ecological permeable dam reactor
Creators: name: Yuan, Donghai
name: Bai, Minghui
name: He, Liansheng
name: Zhou, Qiang
name: Kou, Yingying
name: Li, Junqi
Publisher: name: Taylor & Francis
Year: 2022
Subjects: subject: Biochemistry
subject: Microbiology
subject: FOS: Biological sciences
subject: Biotechnology
subject: Environmental Sciences not elsewhere classified
subject: Chemical Sciences not elsewhere classified
subject: Ecology
subject: Biological Sciences not elsewhere classified

description: In this present study, an advection ecological permeable dam (AEPD) based on a biofilm reactor was established to investigate pollution control performance and dissolved organic matter (DOM) bio-degradation. The AEPD achieved optimal efficiency—chemical oxygen demand, 6–53 mg/L; total nitrogen concentration, 1.47–6.89 mg/L; total phosphorus concentration, 0.53–3.93 mg/L, and increases in values for ultraviolet–visible parameters—SUVA254, from 0.392 to 0.673–1.438; E4/E6, from 1.09 to 1.11–1.26; A240–400, from 12.06 to 13.09–19.95; and A253–203, from 0.03 to 0.04-0.23. This showed that DOM degradation promoted its humification, aromatisation, and unsaturation as well as increased the number of polar functional groups in the organic aromatic rings of DOM. Synchronous fluorescence and parallel factor analyses indicated that AEPD could effectively degrade tyrosine-like and tryptophan-like compounds, which showed the most significant decrease in fluorescence intensity. Additionally, AEPD displayed some stable dominant bacterial genera (e.g. Proteobacteria_unclassified, Bacteroidetes_unclassified, Gemmobacter, Pseudofulvimonas, Flavobacterium, Pseudomonas, and Nitrospira), although their relative abundance differed under variable hydraulic loading rates. This research provided further technical support for the application of AEPD in the treatment of water environment pollution.
Fate of the weakly bound Psi(2S) in nuclear matter
Creators: name: Durham, Matthew
Publisher: name: Zenodo
Year: 2021
Subjects: qm14
phenix
charmonium
dielectron
dimuon
heavy flavor
J/Ψ
raa
nuclear
modification
mid-rapidity
forward-rapidity

description: Talk presented at the Quark Matter 2014 conference
La costituzione della polis pedagogica. Soggetto e oggetto nella costruzione del sapere.
Creators: name: Lampronti, Paolo <1942>
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2011
Subjects: M-PED/01 Pedagogia generale e sociale

description: La ricerca muove dall’ipotesi che le incalzanti riforme introdotte nella scuola italiana a partire dalla fine degli anni novanta non abbiano cambiato il dispositivo pedagogico della scuola tradizionale. Si è quindi andati alla ricerca nella “cassetta degli attrezzi” di Michel Foucault e di Célestin Freinet degli strumenti concettuali e pratici utili al cambiamento del dispositivo pedagogico L’esperienza politico- pedagogica del Lycée expérimental de Saint-Nazaire (Loire-Atlantique) è presentata come esempio di cambiamento possibile.
description: The research starts from the hypothesis that the reforms enacted in Italian schools from the end of the nineties have not changed the “pedagogic device” of the traditional school.
In the analyses of Michel Foucault and in the pedagogic principles of Célestin Freinet we have researched the conceptual and pedagogic instruments useful to change the “pedagogic device”. The political-pedagogic experience of Lycée expérimental de Saint-Nazaire (Loire-Atlantique) is presented as an example of possible change.
A new slotted-wall method for producing low boundary corrections in two-dimensional airfoil testing
Creators: name: Williams, Christopher Dwight
Publisher: name: University of British Columbia
Year: 2010

description: This thesis deals with a new approach to reducing windtunnel wall corrections in airfoil testing, by employing a transversely-slotted wall opposite the suction side of the airfoil, and a solid wall opposite the pressure side. The solid elements of the slotted wail are symmetrical airfoils at zero incidence. This geometry permits the flow to assume closely the streamline pattern for unconfined flow, without degrading the flow quality through shear layer mixing near the test airfoil. The theory uses the potential flow surface source-element method, with Kutta conditions satisfied on the test airfoil and the wall slats. In experiments using a range of sizes of airfoils of three different profiles, good agreement with the predictions of the theory has been obtained. It appears that uncorrected lift coefficients and pressure distributions, accurate to within one percent, can be obtained for a wide range of airfoil shapes, sizes, and lift coefficients, using a slotted wall of open-area ratio between 60 and 70 percent.
Stochastic flows with reflection
Creators: name: Pilipenko, Andrey
Publisher: name: arXiv
Year: 2008
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics
subject: 60H10; 60D05

description: Some topological properties of stochastic flow $φ_t(x)$ generated by stochastic differential equation in a ${\mathbb R}^d_+$ with normal reflection at the boundary are investigated. Sobolev differentiability in initial condition is received. The absolute continuity of the measure-valued process $μ\circφ_t^{-1}$, where $μ\llλ^d,$ is studied.
description: 10 pages
Towards Cognitive Bots: Architectural Research Challenges
Creators: name: Gidey, Habtom Kahsay
name: Hillmann, Peter
name: Karcher, Andreas
name: Knoll, Alois
Publisher: name: arXiv
Year: 2023
Subjects: subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences

description: Software bots operating in multiple virtual digital platforms must understand the platforms' affordances and behave like human users. Platform affordances or features differ from one application platform to another or through a life cycle, requiring such bots to be adaptable. Moreover, bots in such platforms could cooperate with humans or other software agents for work or to learn specific behavior patterns. However, present-day bots, particularly chatbots, other than language processing and prediction, are far from reaching a human user's behavior level within complex business information systems. They lack the cognitive capabilities to sense and act in such virtual environments, rendering their development a challenge to artificial general intelligence research. In this study, we problematize and investigate assumptions in conceptualizing software bot architecture by directing attention to significant architectural research challenges in developing cognitive bots endowed with complex behavior for operation on information systems. As an outlook, we propose alternate architectural assumptions to consider in future bot design and bot development frameworks.
Mass, Morphing, Metallicities: The Evolution of Infalling High Velocity Clouds
Creators: name: Heitsch, F.
name: Marchal, A.
name: Miville-Deschênes, M. -A.
name: Shull, J. M.
name: Fox, A. J.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We revisit the reliability of metallicity estimates of high velocity clouds with the help of hydrodynamical simulations. We quantify the effect of accretion and viewing angle on metallicity estimates derived from absorption lines. Model parameters are chosen to provide strong lower limits on cloud contamination by ambient gas. Consistent with previous results, a cloud traveling through a stratified halo is contaminated by ambient material to the point that <10% of its mass in neutral hydrogen consists of original cloud material. Contamination progresses nearly linearly with time, and it increases from head to tail. Therefore, metallicity estimates will depend on the evolutionary state of the cloud, and on position. While metallicities change with time by more than a factor of 10, well beyond observational uncertainties, most lines-of-sight range only within those uncertainties at any given time over all positions. Metallicity estimates vary with the cloud's inclination angle within observational uncertainties. The cloud survives the infall through the halo because ambient gas continuously condenses and cools in the cloud's wake and thus appears in the neutral phase. Therefore, the cloud observed at any fixed time is not a well-defined structure across time, since material gets constantly replaced. The thermal phases of the cloud are largely determined by the ambient pressure. Internal cloud dynamics evolve from drag gradients caused by shear instabilities, to complex patterns due to ram-pressure shielding, leading to a peloton effect, in which initially lagging gas can catch up to and even overtake the head of the cloud.
description: 18 pages, 10 figures. Revised submission to MNRAS
A study on the origin of old Dhamar city and its urban development until 1962 AD
Creators: name: Al-Nehmi Ahmed
name: Yafaa Ahmed
name: Al-Nomari Ebrahim
Publisher: name: Cultural Heritage and Modern Technologies
Year: 2024
Subjects: Yemen
Yemeni Architecture
Mosques
Dhamar City
Islamic Architecture

description: The study attempts to reveal the historical roots of the emergence of the ancient city of Dhamar and its urban development during successive periods. The research problem lies in the lack of a specialized study that focuses its attention on the emergence and development of the city’s architecture and development. The aim of the study was to trace the emergence of the city, and draw a clear picture of the city’s borders and its urban growth in successive historical periods until the revolution in 1962 AD, in addition to identifying the influences that had a major role in the city’s architecture and urbanization. The study relied mainly on previous historical and archaeological sources to trace the planning and urban characteristics of Yemeni cities in the preand post-Islamic periods, as well as studies that dealt with the city in particular. On the other hand, conducting a field trip to collect the information required for the study through observation and collecting photos. In dealing with the subject, the study relied on a number of approaches: the historical approach to trace the stages through which the city passed the comparative approach to compare the ancient city with its counterparts to determine similarities and differences, and the analytical and descriptive approach to analyze the urban structure of the city. The study concluded that the ancient city has maintained its urban cohesion over thousands of years, adhering to its alleys, streets, buildings, elements, and details of architectural facades, and during different periods, maintaining the continuity of its values and principles of construction. The study confirmed the research hypothesis about the emergence of the city as a trading station on the trade caravan route that penetrates the plateau of the central Yemeni highlands. The study also confirmed the hypothesis of research on the emergence of the city of Dhamar when the trade caravan route flourished. The city became famous and became an important area and trading station around the third century AD.
Analysis of film break-up and dry patch stability
Creators: name: De Rodriguez, Sara Gersberg
Publisher: name: University of British Columbia
Year: 2010

description: The stability of stationary dry patches in a thin, heated liquid film was analyzed according to previous models and compared with recent experimental data. Previous analysis indicate that dry patch stability is expressed in terms of a balance of forces at the upstream edge of the dry patch: a pressure force tends to rewet the dry patch, and the surface tension and thermocapillary forces causes the dry patch to spread. Roughly, the models are reduced to two types, the first evaluates pressure force applying a Bernoulli-type equation to the center-streamlines, the second uses the control-volume approach. The former method gives half the pressure force predicted by the second model; in both analyses the flow is considered one-dimensional. In the present study the contradiction was clarified by applying the control volume technique to a two-dimensional flow. Both methods give equivalent results for the limiting case of control volume coinciding with the center streamline. When experimental data are used the model that proposes a Bernoulli-type equation to find pressure force best describes the balance of forces, specially for low Reynolds numbers. For high Reynolds numbers pressure forces depart significantly from surface forces. In the present study the force balance criterion for stability of dry patches was extended to the case of a wavy film. Kapitza's analysis for surface waves on thin film was used and the bi-dimensional character of the flow was considered through the introduction of a coefficient whose value was assumed equal to the steady case. Results show that a body force must be included together with pressure force to balance surface tension force. A better description of the flow field is needed since Kapitza's analysis is not valid near the dry patch. A further model is presented by means of which film profiles and pressure forces can be evaluated. The goal was to describe flow behaviour of a thin heated film around a dry patch. Due to the complexity of the problem different assumptions at various stages were made. The problem was divided into two regions, similar to a boundary layer method. In the outer region surface tension effects were neglected and the patch acts like a solid object for the flow. Increases in stagnation pressure are balanced by changes in hydrostatic pressure. In the inner region surface tension effects predominate over inertial effects. The free surface profiles, valid for a narrow range of low Reynolds numbers, are wedge-shaped and different from measured profiles. In future work surface tension effects in the outer region must be included and the solution extended to a larger range of Reynolds numbers.
The lonely Moon, double asteroids, and multiple collisions
Creators: name: Gorkavyi, Nick
name: Taidakova, Tanya
Publisher: name: arXiv
Year: 2021
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: The Chelyabinsk meteor sailed over skies in a streak of light that was momentarily brighter than the Sun. The Chelyabinsk superbolide is a complex and multi-aspect phenomenon. The Appendix to the book examines the role of cosmic collisions in the formation and evolution of such bodies of the solar system as the Moon, double asteroids and irregular satellites of giant planets.
description: The article in The Appendix to the book "Chelyabinsk Superbolide" (Eds. Nick Gorkavyi, Alexander Dudorov, Sergey Taskaev, Springer Praxis Books, 2019), 6 pages, 3 figures
My friends also prefer diverse music: homophily and link prediction with user preferences for mainstream, novelty, and diversity in music
Creators: name: Duricic, Tomislav
name: Kowald, Dominik
name: Schedl, Markus
name: Lex, Elisabeth
Publisher: name: arXiv
Year: 2021
Subjects: subject: Social and Information Networks (cs.SI)
subject: FOS: Computer and information sciences

description: Homophily describes the phenomenon that similarity breeds connection, i.e., individuals tend to form ties with other people who are similar to themselves in some aspect(s). The similarity in music taste can undoubtedly influence who we make friends with and shape our social circles. In this paper, we study homophily in an online music platform Last.fm regarding user preferences towards listening to mainstream (M), novel (N), or diverse (D) content. Furthermore, we draw comparisons with homophily based on listening profiles derived from artists users have listened to in the past, i.e., artist profiles. Finally, we explore the utility of users' artist profiles as well as features describing M, N, and D for the task of link prediction. Our study reveals that: (i) users with a friendship connection share similar music taste based on their artist profiles; (ii) on average, a measure of how diverse is the music two users listen to is a stronger predictor of friendship than measures of their preferences towards mainstream or novel content, i.e., homophily is stronger for D than for M and N; (iii) some user groups such as high-novelty-seekers (explorers) exhibit strong homophily, but lower than average artist profile similarity; (iv) using M, N and D achieves comparable results on link prediction accuracy compared with using artist profiles, but the combination of features yields the best accuracy results, and (v) using combined features does not add value if graph-based features such as common neighbors are available, making M, N, and D features primarily useful in a cold-start user recommendation setting for users with few friendship connections. The insights from this study will inform future work on social context-aware music recommendation, user modeling, and link prediction.
description: 8 page full paper accepted at the 12th International Workshop on Mining and Analyzing Social Networks for Decision Support (MSNDS 2021). Included in the Proceedings of the 2021 IEEE/ACM International Conference on Advances in Social Networks Analysis and Mining (ASONAM 2021)
title: UroTC de dos hélices con técnica de reducción de dosis.La alternativa de la Urografía intravenosa.
Creators: name: Lopez-Negrete, Luis
Publisher: name: Sociedad Española de Radiología Médica
Year: 2014
Subjects: subject: Pyelography
subject: Cystography / Uretrography
subject: CT
subject: Urinary Tract / Bladder
subject: Kidney

description: Objetivos
Material y método
Resultados
Conclusiones
Bibliografía
description: Objetivos:
...
title: Adenoma de la Lactancia
Creators: name: Caminero Pardo, Luis
Publisher: name: Sociedad Española de Radiología Médica
Year: 2014
Subjects: subject: Neoplasia
subject: Catheters
subject: Ultrasound
subject: Breast

description: Objetivos
Material y método
Resultados
Conclusiones
Bibliografía
description: Objetivos:
Describir nuestra experiencia en pacientes con adenomas de la...
title: Problems of Implementing State Policy on Internally Displaced Persons in Ukraine
Creators: name: Kapinus, Oleksandra
Publisher: name: Social Studies: Theory and Practice, 1(10)
Year: 2021

description: The article presents the results of the author’s expert survey «The problems of implementing the state policy on internally displaced persons (IDPs) in Ukraine». The challenges of implementing the state IDP policy in Ukraine are determined. The imperfection of information and analytical provision of the state policy on internally displaced persons was revealed. It is proposed: to introduce amendments and supplements to the Law of Ukraine «On ensuring the rights and freedoms of internally displaced persons» and other legislative acts; to develop a national strategy for implementing the state policy on internally displaced persons.
An instability of higher-dimensional rotating black holes
Creators: name: Dias, Oscar J. C.
name: Figueras, Pau
name: Monteiro, Ricardo
name: Reall, Harvey S.
name: Santos, Jorge E.
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We present the first example of a linearized gravitational instability of an asymptotically flat vacuum black hole. We study perturbations of a Myers-Perry black hole with equal angular momenta in an odd number of dimensions. We find no evidence of any instability in five or seven dimensions, but in nine dimensions, for sufficiently rapid rotation, we find perturbations that grow exponentially in time. The onset of instability is associated with the appearance of time-independent perturbations which generically break all but one of the rotational symmetries. This is interpreted as evidence for the existence of a new 70-parameter family of black hole solutions with only a single rotational symmetry. We also present results for the Gregory-Laflamme instability of rotating black strings, demonstrating that rotation makes black strings more unstable.
description: 38 pages, 13 figures