cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Holes in a Quantum Spin Liquid
Creators: name: Xu, Guangyong
name: Aeppli, G.
name: Bisher, M. E.
name: Broholm, C.
name: DiTusa, J. F.
name: Frost, C. D.
name: Ito, T.
name: Oka, K.
name: Paul, R. L.
name: Takagi, H.
name: Treacy, M. M. J.
Publisher: name: arXiv
Year: 2001
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Magnetic neutron scattering provides evidence for nucleation of antiferromagnetic droplets around impurities in a doped nickel-oxide based quantum magnet. The undoped parent compound contains a spin liquid with a cooperative singlet ground state and a gap in the magnetic excitation spectrum. Calcium doping creates excitations below the gap with an incommensurate structure factor. We show that weakly interacting antiferromagnetic droplets with a central phase shift of $π$ and a size controlled by the correlation length of the quantum liquid can account for the data. The experiment provides a first quantitative impression of the magnetic polarization cloud associated with holes in a doped transition metal oxide.
description: tex file for 5 pages and four figures in separated jpg files
title: The Effects of Dredged Materials on the Copeod, Acartia Tonsa
Creators: name: Crouch, Renee Suzanne
Publisher: name: Old Dominion University
publisherIdentifier: https://ror.org/04zjtrb98
publisherIdentifierScheme: ROR
Year: 1983

description: A study was conducted to determine the potential impact of open ocean disposal of sediments dredged from a highly industrialized seaport. Sediments from three potential dredge sites along the Southern Branch of the Elizabeth River, Hampton Roads, Virginia were evaluated for acute toxicity. The suspended particulate fractions of dredged materials were tested in a series of 96-hour, static bioassays using the calanoid copepod, Acartia tonsa Dana. Significant mortalities were observed for all three sites with the sediments from the most heavily industrialized site producing immediate and severe mortality. Analysis of results indicates that mortality was highly related to the volatile portion of suspended particulates and to site-specific factors. Potential effects on the zooplankton community are evaluated in reference to dispersal of suspended particulates in the open ocean. Advantages of a staining method for sorting live and dead copepods new to dredged material assessment are discussed.
Solutions of the spherically symmetric SU(2) Einstein-Yang-Mills equations defined in the far field
Creators: name: Wasserman, Arthur G.
Publisher: name: arXiv
Year: 2000
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: It is shown analytically that every static, spherically symmetric solution to the Einstein Yang Mills equations with SU(2) gauge group that is defined in the far field has finite ADM mass. Moreover, there can be at most two horizons for such solutions. The three types of solutions possible, Bartnik-McKinnon particle-like solutions, Reissner-Nordstrom-like solutions, and black hole solutions having only one horizon are distinguished by the behavior of the metric coefficients at the origin.
description: 15 pages
MPEC 2025-H129 : 2025 HC3
Creators: name: Minor Planet Center Staff
Publisher: name: The Minor Planet Center
Year: 2025
Subjects: subject: Small Solar System bodies
valueUri: http://astrothesaurus.org/uat/1469
subject: 2025 HC3

description: The Minor Planet Electronic Circulars contain information on unusual minor planets, routine data on comets and natural satellites, and occasional editorial announcements.  They are published on behalf of Division F of the International Astronomical Union by the Minor Planet Center, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
The NNLO soft function for N-jettiness in hadronic collisions
Creators: name: Bell, Guido
name: Dehnadi, Bahman
name: Mohrmann, Tobias
name: Rahn, Rudi
Publisher: name: Deutsches Elektronen-Synchrotron, DESY, Hamburg
Year: 2023
Subjects: hadron hadron: interaction
expansion: strong coupling
higher-order: 2
Wilson loop
benchmark
collinear
asymptotic behavior
numerical calculations
phase space

description: We compute the N-jettiness soft function in hadronic collisions to next-to-next-to-leading order (NNLO) in the strong-coupling expansion. Our calculation is based on an extension of the SoftSERVE framework to soft functions that involve an arbitrary number of lightlike Wilson lines. We present numerical results for 1-jettiness and 2-jettiness, and illustrate that our formalism carries over to a generic number of jets by calculating a few benchmark points for 3-jettiness. We also perform a detailed analytic study of the asymptotic behaviour of the soft-function coefficients at the edges of phase space, when one of the jets becomes collinear to another jet or beam direction, and comment on previous calculations of the N-jettiness soft function.
Orion Source I's disk is salty
Creators: name: Ginsburg, Adam
name: McGuire, Brett
name: Plambeck, Richard
name: Bally, John
name: Goddi, Ciriaco
name: Wright, Melvyn
Publisher: name: arXiv
Year: 2019
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We report the detection of NaCl, KCl, and their $^{37}$Cl and $^{41}$K isotopologues toward the disk around Orion SrcI. About 60 transitions of these molecules were identified. This is the first detection of these molecules in the interstellar medium not associated with the ejecta of evolved stars. It is also the first ever detection of the vibrationally excited states of these lines in the ISM above v = 1, with firm detections up to v = 6. The salt emission traces the region just above the continuum disk, possibly forming the base of the outflow. The emission from the vibrationally excited transitions is inconsistent with a single temperature, implying the lines are not in LTE. We examine several possible explanations of the observed high excitation lines, concluding that the vibrational states are most likely to be radiatively excited via rovibrational transitions in the 25-35 μm (NaCl) and 35-45 μm (KCl) range. We suggest that the molecules are produced by destruction of dust particles. Because these molecules are so rare, they are potentially unique tools for identifying high-mass protostellar disks and measuring the radiation environment around accreting young stars.
description: Accepted to ApJ. Analysis code at https://github.com/keflavich/Orion_ALMA_2016.1.00165.S, paper source at https://github.com/keflavich/SaltyDisk, and data at https://zenodo.org/record/1213350
Spin Liquid Phases in 2D Frustrated XY Model
Creators: name: Simon, P.
Publisher: name: arXiv
Year: 1997
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: In this paper we consider the $J_1-J_2-J_3$ classical and quantum 2D XY model. Spin wave calculations show that a spin liquid phase still exists in the quantum case as for Heisenberg models. We formulate a semiclassical approach of these models based on spin wave action and use a variational method to study the role played by vortices. Liquid and crystal phases of vortex could emerge in this description. These phases seem to be directly correlated with the spin liquid one and to its crystalline interpretation.
description: 16 pages, Latex, 4 figures. To be published in Phys. Rev. B
Table s1 from Maternal and fetal cardiometabolic recovery following ultrasound-guided high-intensity focused ultrasound placental vascular occlusion
Creators: name: Shaw, Caroline J.
name: Rivens, Ian
name: Civale, John
name: Botting, Kimberley J.
name: Allison, Beth J.
name: Brain, Kirsty L.
name: Y. Niu
name: Haar, Gail Ter
name: Giussani, Dino A.
name: Lees, Christoph C.
Publisher: name: The Royal Society
Year: 2019
Subjects: subject: Biological Engineering
subject: 29903 Medical Physics
subject: FOS: Physical sciences

description: Exposure characteristics and outcomes of HIFU exposure series categorised by animal and vascular target.
Horisme obscurata subsp. gaudata Fletcher D. S. 1956
Creators: name: Mbata, Keith J.
name: Prins, Jurate De
Publisher: name: Zenodo
Year: 2023
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Lepidoptera
Geometridae
Horisme
Horisme obscurata
Horisme obscurata gaudata fletcher d. s., 1956

description: Horisme obscurata gaudata Fletcher D. S., 1956
COMMON NAME(S): Geometer moth.
SYNONYM(S): None.
IUCN STATUS: Not Evaluated (NE).
DISTRIBUTION: Angola, Kenya, Tanzania, Zambia.
LOCALITY IN ZAMBIA: Solwezi, in Northwestern Province.
LARVAL HOSTPLANT(S): Unknown.
SOURCES De Prins & De Prins 2022; Fletcher 1956.
Genus Piercia Janse, 1933
description: Published as part of Mbata, Keith J. & Prins, Jurate De, 2023, Annotated checklist of moths of Zambia (Insecta: Lepidoptera), pp. 1-503 in Zootaxa 5354 (1) on pages 245-246, DOI: 10.11646/zootaxa.5354.1.1, http://zenodo.org/record/10130434
Kulturelle und musisch-ästhetische Bildung: Wie viel Zeit investieren Familien?
Creators: name: Gönsch, Iris
name: Liersch, Anja
name: Merkel, Nora
Publisher: name: JFR - Journal of Family Research
Year: 2018

description: Cultural education constitutes an important part of general knowledge/education and creates the foundation of cultural participation in society. Children and adolescents experience cultural education at school, but also at home and by visiting cultural institutions during leisure time. Using data from the German Time Use Survey 2012/13, this paper analyses the amount of time children and adolescents in Germany spend on culture and (fine) arts. These time designations are then linked to household characteristics. The analyses show that children and adolescents whose parents have a higher level of education spend significantly more time on activities classified as ‘high quality activities’. They spend significantly more time for artistic activities and reading and, in return, less time for cultural activities of lower quality like computer games and watching TV. Zusammenfassung Kulturelle Bildung stellt einen wichtigen Teil der Allgemeinbildung dar und schafft die Grundlage für die kulturelle Teilhabe an der Gesellschaft. Kinder und Jugendliche erfahren kulturelle Bildungin der Schule, aber auch im Elternhaus oder durch den Besuch kultureller Einrichtungen in der Freizeit. Dieser Beitrag untersucht anhand der Daten der Zeitverwendungserhebung 2012/13 die Zeitverwendung für kulturelle und musisch-ästhetische Aktivitäten von Kindern und Jugendlichen in Deutschland. Die von den Kindern und Jugendlichen für verschiedene kulturelle und musischästhetische Tätigkeiten aufgebrachte Zeit wird anschließend mit Haushaltscharakteristika verknüpft. Die Analysen zeigen, dass Kinder und Jugendliche, deren Eltern einen höheren Bildungsstand haben, signifikant mehr Zeit für als qualitativ ‚hochwertig‘ eingestufte Tätigkeiten verwenden. Sie bringen signifikant mehr Zeit für künstlerische Tätigkeiten sowie Lesen und dafür weniger Zeit für die als wenig ‚hochwertig‘ eingestuften Tätigkeiten Computerspielen und Fernsehen auf.
description: JFR - Journal of Family Research, Vol 30 No 1 (2018): Zeitverwendung in der Familie
Influence of Total Suspended Solids on the Growth of the Sea Lettuce Ulva lactuca Integrated with the Pacific White Shrimp Litopenaeus vannamei in a Biofloc System
Creators: name: Carvalho, Andrezza
Publisher: name: Zenodo
Year: 2023

description: A biofloc system is rich in nutrients, which favours the cultivation of macroalgae, but the influence of the system on the performance of macroalgae is unknown. The objective of this study was to analyze the feasibility of introducing the macroalgae Ulva lactuca into the culture of Litopenaeus vannamei in a biofloc system. The first experiment evaluated the influence of 400 mg L−1 and 30 mg L−1 solids concentration of the system in biofloc and von Stosch culture medium on macroalgae growth. In the second experiment, the densities of 1, 2, and 3 g L−1 of U. lactuca were cultivated in an integrated system with shrimp and monoculture treatment.

Both experiments had 35 days of cultivation. There was no significant difference in macroalgae growth between the treatments with biofloc and von Stosch culture medium. In the integrated culture, the density of 1 g L−1 showed better nutrient absorption. Shrimp performance was not affected by macroalgae cultivation. In conclusion, the solids did not affect the growth of the macroalgae, and it could be cultivated in a biofloc system for nitrate uptake in integrated culture with shrimp.
Effect of 4-position pyridine ring substitution on Zn(II) complexes of 4-substituted Py2N2 pyridinophane macrocycles
Creators: name: Smith, Katherine J.
name: Schwartz, Timothy M.
name: Johnston, Hannah M.
name: Freire, David M.
name: Póta, Kristóf
name: Green, Kayla N.
Publisher: name: Taylor & Francis
Year: 2025
Subjects: subject: Biophysics
subject: Biochemistry
subject: Space Science
subject: Physical Sciences not elsewhere classified
subject: Genetics
subject: FOS: Biological sciences
subject: Biotechnology
subject: Chemical Sciences not elsewhere classified
subject: Cancer

description: The metal binding properties of macrocyclic small molecules are a key property that drives the applications for which these ligands can be used. Pyridine-modified Py2N2 pyridinophane small molecules are a new class of macrocyclic small molecules, whose properties have not been explored. As a result, Zn(II) metal binding of a library of six pyridine-modified Py2N2 complexes is reported here. These results include 1H NMR, log βZn(II), and X-ray diffraction, which are compared to PyN3 congeners to show that the differences in each scaffold yield markedly different metal binding properties that can be exploited in future applications.
Evidence for d-wave superconductivity in the repulsive Hubbard-model
Creators: name: Fettes, W.
name: Morgenstern, I.
Publisher: name: arXiv
Year: 1998
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We perform numerical simulations of the Hubbard model using the projector Quantum Monte Carlo method. A novel approach for finite size scaling is discussed. We obtain evidence in favor of d-wave superconductivity in the repulsive Hubbard model. For U=4, $T_c$ is roughly estimated as $T_c\approx 30K$.
description: 13 pages, 3 figures, 2 tables, submitted to Phys. Rev. Letters
Electronic Transport in Metal Nanocrystal Arrays: The Effect of Structural Disorder on Scaling Behavior
Creators: name: Parthasarathy, Raghuveer
name: Lin, Xiao-Min
name: Jaeger, Heinrich M.
Publisher: name: arXiv
Year: 2001
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: We investigate the impact of structural disorder on electronic transport in gold nanocrystal monolayers. Arrays ranging from void-filled networks to well-ordered superlattices show clear voltage thresholds V_T due to Coulomb blockade, and temperature-independent conduction indicative of quantum tunneling. Current-voltage characteristics of arrays with and without long-range structural order were found to collapse onto distinct scaling curves. The former follow a single power-law: I (V-V_T)^ζ, ζ= 2.25+/-0.1. The latter show additional structure, reflecting the underlying disordered topology.
description: 4 pages, 3 figures. Figure 1 is best viewed in the PostScript version.
Black Hole Decay and Quantum Instantons
Creators: name: Bak, Donsu
name: Kim, Sang Pyo
name: Kim, Sung Ku
name: Soh, Kwang-Sup
name: Yee, Jae Hyung
Publisher: name: arXiv
Year: 2000
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We study the analytic structure of the S-matrix which is obtained from the reduced Wheeler-DeWitt wave function describing spherically symmetric gravitational collapse of massless scalar fields. The complex simple poles in the S-matrix lead to the wave functions that satisfy the same boundary condition as quasi-normal modes of a black hole, and correspond to the bounded states of the Euclidean Wheeler-DeWitt equation. These wave function are interpreted as quantum instantons.
description: RevTex, 7 pages, no figure; The wave functions of gr-qc/9912115 are newly interpreted as quantum instantons describing a black hole decay. Replaced by the version to be published in Phys. Rev. D, in which the boundary condition on the apparent horizon is clarified
Dynamical Effective Medium Theory for Quantum Spins and Multipoles
Creators: name: Kuramoto, Yoshio
name: Fukushima, Noboru
Publisher: name: arXiv
Year: 1997
Subjects: subject: Condensed Matter (cond-mat)
subject: FOS: Physical sciences

description: A dynamical effective medium theory is presented for quantum spins and higher multipoles such as quadrupole moments. The theory is a generalization of the spherical model approximation for the Ising model, and is accurate up to O(1/z_n) where z_n is the number of interacting neighbors. The polarization function is optimized under the condition that it be diagonal in site indices. With use of auxiliary fields and path integrals, the theory is flexibly applied to quantum spins and higher multipoles with many interacting neighbors. A Kondo-type screening of each spin is proposed for systems with extreme quantum fluctuations but without conduction electrons.
description: 16 pages, 3 Postscript figures
Effect of Inhomogeneity on Primordial Black Hole Formation in the Matter Dominated Era
Creators: name: Kokubu, Takafumi
name: Kyutoku, Koutarou
name: Kohri, Kazunori
name: Harada, Tomohiro
Publisher: name: arXiv
Year: 2018
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We investigate the effect of inhomogeneity on primordial black hole formation in the matter dominated era. In the gravitational collapse of an inhomogeneous density distribution, a black hole forms if apparent horizon prevents information of the central region of the configuration from leaking. Since information cannot propagate faster than the speed of light, we identify the threshold of the black hole formation by considering the finite speed for propagation of information. We show that the production probability $β_{inhom}(σ)$ of primordial black holes, where $σ$ is density fluctuation at horizon entry, is significantly enhanced from that derived in previous work in which the speed of propagation was effectively regarded as infinite. For $σ\ll 1$, we obtain $β_{inhom}\simeq 3.70 σ^{3/2}$, which is larger by about an order of magnitude than the probability derived in earlier work by assuming instantaneous propagation of information.
description: 17pages, 7figures
UNIVERSITY SCIENTIFIC RESEARCH AND ITS RELATIONSHIP WITH SOCIAL AND ECONOMIC DEVELOPMENT IN ARAB SOCIETY (YEMEN AS A MODEL)
Creators: name: ABDULLATIF HAMID ALI ABDULLAH
name: ALI YAHYA AHMED ATEF
name: FUAD MANSOOR AHMED AL-WARD
Publisher: name: Zenodo
Year: 2024
Subjects: University Research, Social Development, Economic Development.

description: Abstract

The current study aims to investigate the importance of university scientific research in the service of social and economic development in Arab society in general and Yemeni society in particular during the period from 2015-2022.The approach adopted in this study was the descriptive and analytical approach to data and information, which constituted a major source of this study, as well as some statistics issued by Arab and Yemeni educational institutions. The volume of scientific production (published research) of Arab universities and research centers amounted to approximately 410,549 until 2021. while the scientific production of Sana’a University since its establishment until 2022, amounted to 9250 research papers and scientific papers. It is worth mentioning that the scientific research published by Sana’a University during the period 2015-2022 which is the period of conducting this study amounted to approximately 2,400 research papers and scientific papers. Research and academic promotions for university faculty members and research centers. n addition to what was accomplished in the research of Master’s and Doctoral theses, which were discussed in graduate studies at the University of Sana’a during the study period, 1616 Master and Doctoral theses for the programs available for postgraduate studies within the Sana’a University.
Additional file 8 of Elevated retrotransposon activity and genomic instability in primed pluripotent stem cells
Creators: name: Fu, Haifeng
name: Zhang, Weiyu
name: Li, Niannian
name: Yang, Jiao
name: Ye, Xiaoying
name: Tian, Chenglei
name: Lu, Xinyi
name: Liu, Lin
Publisher: name: figshare
Year: 2021
Subjects: subject: Genetics
subject: FOS: Biological sciences

description: Additional file 8. Review history.
Gravoelectric-dual of the Kerr solution
Creators: name: Dadhich, Naresh
name: Patel, L. K.
Publisher: name: arXiv
Year: 1999
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: By decomposing the Riemann curvature into electric and magnetic parts, we define the gravoelectric duality transformation by interchange of active and passive electric parts which amounts to interchange of the Ricci and Einstein tensors. It turns out that the vacuum equation is duality-invariant. We obtain solutions dual to the Kerr solution by writing an effective vacuum equation in such a way that it still admits the Kerr solution but is not duality invariant. The dual equation is then solved to obtain the dual-Kerr solution which can be interpreted as the Kerr black hole sitting in a string dust universe.
description: 14 pages, LaTEX version
Asthma control test reflects not only lung function but also airway inflammation in children with stable asthma
Creators: name: Lee, Woo Yeon
name: Suh, Dong In
name: Song, Dae Jin
name: Hey-Sung Baek
name: Meeyong Shin
name: Yoo, Young
name: Kwon, Ji-Won
name: Jang, Gwang Cheon
name: Hyeon-Jong Yang
name: Lee, Eun
name: Ju-Hee Seo
name: Woo, Sung-Il
name: Kim, Hyung Young
name: Shin, Youn Ho
name: Lee, Ju Suk
name: Jisun Yoon
name: Sungsu Jung
name: Minkyu Han
name: Eunjin Eom
name: Jinho Yu
name: Kim, Woo Kyung
name: Lim, Dae Hyun
name: Kim, Jin Tack
name: Woo-Sung Chang
name: Jeom-Kyu Lee
name: Kim, Hwan Soo
Publisher: name: Taylor & Francis
Year: 2019
Subjects: subject: Biochemistry
subject: Medicine
subject: Cell Biology
subject: Genetics
subject: FOS: Biological sciences
subject: Molecular Biology
subject: Physiology
subject: Immunology
subject: FOS: Clinical medicine
subject: Developmental Biology
subject: 111714 Mental Health
subject: FOS: Health sciences

description: Objective: Various numerical asthma control tools have been developed to distinguish different levels of symptom control. We aimed to examine whether the asthma control test (ACT) is reflective of objective findings such as lung function, fractional exhaled nitric oxide (FeNO) and laboratory data in patients with stable asthma. Methods: We included patients who were enrolled in the Korean Childhood Asthma Study. ACT, spirometry, blood tests and FeNO were performed in patients after stabilization of their asthma. We examined differences among spirometry parameters, blood tests and FeNO according to control status as determined by ACT and investigated for any significant correlations. Results: The study population consisted of 441 subjects. Spirometry showed that forced expiratory volume in one second (FEV1), forced expiratory flow between 25% and 75% of forced vital capacity and FEV1/forced vital capacity were all significantly higher in the controlled asthma group. Likewise, FeNO and percent-change in FEV1 were both significantly lower in the controlled asthma group. In blood tests, the eosinophil fraction was significantly lower in the controlled asthma group while white blood cell count was significantly higher in the controlled asthma group. Lastly, among the various factors analyzed, only provocative concentration of methacholine causing a 20% fall in FEV1 significantly correlated with ACT score. Conclusion: ACT is useful as part of the routine evaluation of asthmatic children and should be used as a complement to existing tools such as spirometry and FeNO measurement.
An Approach of Optimization Techniques for History Matching and Production Forecasting
Creators: name: Giridhar Vadicharla
name: Sharma, Pushpa
Publisher: name: Zenodo
Year: 2021
Subjects: Reservoir modelling
history matching
ensemble kalman filter
genetic algorithm

description: Petroleum as a natural reserve is depleting year-by-year and there is a firm need of efficient management of petroleum and its reservoir. In this scenario, reservoir modelling and production forecasting provide vital inputs to its efficient management. The naturally occurring reservoirs are highly heterogeneous and nonlinear in nature, which makes us difficult to obtain accurate estimates of the spatial distribution of reservoir properties representing the reservoir and corresponding production profiles. An accurate model built with the help of data obtained from the reservoir, in terms of reservoir properties and history matching, can lead us to efficient management of the reservoir and such models can be built with the help of mathematical modeling and optimization techniques. This chapter describes various optimization techniques applicable for history matching and production forecasting. It discusses gradient based and non-gradient based optimization techniques viz. Simulated Annealing (SA), Scatter Search (SS), Neighborhood algorithm (NA), Particle Swarm Optimization (PSO), Ant Colony Optimization (ACO), Ensemble Kalman Filters (EnKF) and Genetic Algorithm (GA) and their application to reservoir production history matching and performance. The chapter also discusses recent advancements and variations of these techniques used for this purpose.
Quantum disorder in the two-dimensional pyrochlore Heisenberg antiferromagnet
Creators: name: Palmer, S. E.
name: Chalker, J. T.
Publisher: name: arXiv
Year: 2001
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We present the results of an exact diagonalization study of the spin-1/2 Heisenberg antiferromagnet on a two-dimensional version of the pyrochlore lattice, also known as the square lattice with crossings or the checkerboard lattice. Examining the low energy spectra for systems of up to 24 spins, we find that all clusters studied have non-degenerate ground states with total spin zero, and big energy gaps to states with higher total spin. We also find a large number of non-magnetic excitations at energies within this spin gap. Spin-spin and spin-Peierls correlation functions appear to be short-ranged, and we suggest that the ground state is a spin liquid.
description: 7 pages, 11 figures, RevTeX minor changes made, Figure 6 corrected
Double Scalar-Tensor Gravity Cosmologies
Creators: name: Capozziello, S.
name: Lambiase, G.
Publisher: name: arXiv
Year: 2000
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We investigate homogeneous and isotropic cosmological models in scalar-tensor theories of gravity where two scalar fields are nonminimally coupled to the geometry. Exact solutions are found, by Noether symmetries, depending on the form of couplings and self-interaction potentials. An interesting feature is that we deal with the Brans-Dicke field and the inflaton on the same ground since both are nonminimally coupled and not distinguished {\it a priori} as in earlier models. This fact allows to improve dynamics to get successful extended inflationary scenarios. Double inflationary solutions are also discussed.
description: LaTex file, 18 pages, no figures, 2 tables, to appear in Grav. & Cosm
Unconventional Metallic State in Two Dimensional System With Broken Inversion Symmetry
Creators: name: Pudalov, V. M.
Publisher: name: arXiv
Year: 1997
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We present a model that explains two phenomena, recently observed in high-mobility Si-MOS structures: (i) the strong enhancement of metallic conduction at low temperatures, T<2 K, and (ii) the occurrence of the metal-insulator transition in 2D electron system. Both effects are prescribed to the Coulomb and spin-orbit interaction; the latter is anomalously enhanced by the broken inversion symmetry of the confining potential well.
description: 7 pages RevTeX, 2 ps figures. Accepted for publication in JETP Lett., v.66 (1997)
High-channel-count 20 GHz passively mode locked quantum dot laser directly grown on Si with 4.1 Tbit/s transmission capacity
Creators: name: Liu, Songtao
name: Wu, Xinru
name: Jung, Daehwan
name: Norman, Justin C.
name: Kennedy, Mj
name: Tsang, Hon K.
name: Gossard, Arthur C.
name: Bowers, John E.
Publisher: name: arXiv
Year: 2018
Subjects: subject: Optics (physics.optics)
subject: Applied Physics (physics.app-ph)
subject: FOS: Physical sciences

description: Low cost, small footprint, highly efficient and mass producible on-chip wavelength-division-multiplexing (WDM) light sources are key components in future silicon electronic and photonic integrated circuits (EPICs) which can fulfill the rapidly increasing bandwidth and lower energy per bit requirements. We present here, for the first time, a low noise high-channel-count 20 GHz passively mode-locked quantum dot laser grown on complementary metal-oxide-semiconductor compatible on-axis (001) silicon substrate. The laser demonstrates a wide mode-locking regime in the O-band. A record low timing jitter value of 82.7 fs (4 - 80 MHz) and a narrow RF 3-dB linewidth of 1.8 kHz are measured. The 3 dB optical bandwidth of the comb is 6.1 nm (containing 58 lines, with 80 lines within the 10 dB bandwidth). The integrated average relative intensity noise values of the whole spectrum and a single wavelength channel are - 152 dB/Hz and - 133 dB/Hz in the frequency range from 10 MHz to 10 GHz, respectively. Utilizing 64 channels, an aggregate total transmission capacity of 4.1 terabits per second is realized by employing a 32 Gbaud Nyquist four-level pulse amplitude modulation format. The demonstrated performance makes the laser a compelling on-chip WDM source for multi-terabit/s optical interconnects in future large-scale silicon EPICs.
description: 7 pages, 7 figures
The implications of clustered star formation for (proto)planetary systems and habitability
Creators: name: Kruijssen, J. M. Diederik
name: Longmore, Steven N.
Publisher: name: arXiv
Year: 2019
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Star formation is spatially clustered across a range of environments, from dense stellar clusters to unbound associations. As a result, radiative or dynamical interactions with neighbouring stars disrupt (proto)planetary systems and limit their radii, leaving a lasting impact on their potential habitability. In the solar neighbourhood, we find that the vast majority of stars form in unbound associations, such that the interaction of (proto)planetary systems with neighbouring stars is limited to the densest sub-regions. However, the fraction of star formation occurring in compact clusters was considerably higher in the past, peaking at ~50% in the young Milky Way at redshift z~2. These results demonstrate that the large-scale star formation environment affects the demographics of planetary systems and the occupation of the habitable zone. We show that planet formation is governed by multi-scale physics, in which Mpc-scale events such as galaxy mergers affect the AU-scale properties of (proto)planetary systems.
description: 5 pages, 1 figure; to appear in the proceedings of IAU Symposium 345, Origins: from the Protosun to the First Steps of Life, Eds. B. G. Elmegreen, L. V. T\'oth, M. G\"udel, Cambridge University Press
Spectral statistics in disordered metals: a trajectories approach
Creators: name: Smith, Robert A.
name: Lerner, Igor V.
name: Altshuler, Boris L.
Publisher: name: arXiv
Year: 1998
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We show that the perturbative expansion of the two-level correlation function, $R(ω)$, in disordered conductors can be understood semiclassically in terms of self-intersecting particle trajectories. This requires the extension of the standard diagonal approximation to include pairs of paths which are non-identical but have almost identical action. The number of diagrams thus produced is much smaller than in a standard field-theoretical approach. We show that such a simplification occurs because $R(ω)$ has a natural representation as the second derivative of free energy $F(ω)$. We calculate $R(ω)$ to 3-loop order, and verify a one-parameter scaling hypothesis for it in 2d. We discuss the possibility of applying our ``weak diagonal approximation'' to generic chaotic systems.
description: 9 pages in REVTeX two-column format including 4 figures; submitted to Phys.Rev.B
Additional file 1: of Targeted next generation sequencing in 112 Chinese patients with intellectual disability/developmental delay: novel mutations and candidate gene
Creators: name: Yan, Huifang
name: Shi, Zhen
name: Wu, Ye
name: Xiao, Jiangxi
name: Gu, Qiang
name: Yang, Yanling
name: Li, Ming
name: Gao, Kai
name: Chen, Yinyin
name: Yang, Xiaoping
name: Ji, Haoran
name: Cao, Binbin
name: Duan, Ruoyu
name: Jiang, Yuwu
name: Wang, Jingmin
Publisher: name: figshare
Year: 2019
Subjects: subject: Medicine
subject: Microbiology
subject: FOS: Biological sciences
subject: Genetics
subject: Molecular Biology
subject: Biological Sciences not elsewhere classified
subject: Developmental Biology
subject: Marine Biology
subject: Infectious Diseases
subject: FOS: Health sciences

description: Gene List. List of 454 genes related to ID/DD. (DOCX 13 kb)
Effect of Protective Coats on Physiological Parameters of Angora Kids Exposed to Cold, Wet and Windy Conditions: An Advanced Study
Creators: name: M. A. Snyman
name: M. Van Heerden
Publisher: name: Zenodo
Year: 2021
Subjects: Heart rate
rectal temperature
respiratory rate
serum glucose
skin temperature

description: Protective coats were tested on rectal, skin, and subcutaneous temperature, heart rate, respiratory rate, shivering score, and serum glucose level in Angora goat kids exposed to cold, wet, and windy conditions. The experiment was carried out at the Grootfontein Agricultural Development Institute on 24 ten-month-old castrated male Angora goat kids in 2009 and 30 nine-month-old castrated male Angora goat kids in 2010. Rectal temperature of animals in both the Coats and Control groups declined during both the 2009 and 2010 cold stress trial periods. Rectal temperature of the Coats group was 1.91°C higher (36.49 ± 0.45) than the Control group (34.58 ± 0.45) at the end of the trial in 2009. The Coats group animals had a significant 2.21°C lower drop in rectal temperature than the Control group. In 2010, a similar trend was observed, though the rectal temperature of the Coats group animals was only 0.87°C higher than that of the Control group. Skin temperature differences were also found between the two groups. The most noticeable difference was between skin temperatures measured on the shoulder and britch; the area directly covered by the coats. During the early days of the 2010 trial, when the animals were freshly shorn, the animals protected by coats had significantly lower daily temperature amplitudes than the Control group animals. The differences in daily amplitude between the groups became less pronounced as hair length increased. There were no significant differences in subcutaneous temperatures between Coats and Control group animals after four weeks of hair growth. Animals in both the Coats and Control groups had an increased heart rate for the first two hours of the trial, then it decreased to below the initial values at the end. Serum glucose levels of animals in both groups showed a marked drop towards the end of the trial period to 1.33 ng/ml and 1.66 ng/ml in the Coats and Control groups respectively. The fact that both groups of animals shivered to the same degree at the end of the trial period and had a decrease in skin temperature on the extremities and periphery suggests that the coats were not completely capable of providing complete protection against cold, wet, and windy conditions to the point that all of the body's thermoregulatory mechanisms were triggered. When protective coats are tested on a larger scale in practise under natural cold and wet weather conditions, the true test of whether they offer adequate protection to freshly shorn Angora goats during extreme weather conditions will be conducted. The results of this study indicated that Angora kids wearing protective coats were able to maintain their rectal temperatures at higher levels than goats without protective coats during cold, wet and windy conditions.
Wireless Traffic Prediction with Scalable Gaussian Process: Framework, Algorithms, and Verification
Creators: name: Xu, Yue
name: Yin, Feng
name: Xu, Wenjun
name: Lin, Jiaru
name: Cui, Shuguang
Publisher: name: arXiv
Year: 2019
Subjects: subject: Machine Learning (cs.LG)
subject: Networking and Internet Architecture (cs.NI)
subject: Signal Processing (eess.SP)
subject: Machine Learning (stat.ML)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: The cloud radio access network (C-RAN) is a promising paradigm to meet the stringent requirements of the fifth generation (5G) wireless systems. Meanwhile, wireless traffic prediction is a key enabler for C-RANs to improve both the spectrum efficiency and energy efficiency through load-aware network managements. This paper proposes a scalable Gaussian process (GP) framework as a promising solution to achieve large-scale wireless traffic prediction in a cost-efficient manner. Our contribution is three-fold. First, to the best of our knowledge, this paper is the first to empower GP regression with the alternating direction method of multipliers (ADMM) for parallel hyper-parameter optimization in the training phase, where such a scalable training framework well balances the local estimation in baseband units (BBUs) and information consensus among BBUs in a principled way for large-scale executions. Second, in the prediction phase, we fuse local predictions obtained from the BBUs via a cross-validation based optimal strategy, which demonstrates itself to be reliable and robust for general regression tasks. Moreover, such a cross-validation based optimal fusion strategy is built upon a well acknowledged probabilistic model to retain the valuable closed-form GP inference properties. Third, we propose a C-RAN based scalable wireless prediction architecture, where the prediction accuracy and the time consumption can be balanced by tuning the number of the BBUs according to the real-time system demands. Experimental results show that our proposed scalable GP model can outperform the state-of-the-art approaches considerably, in terms of wireless traffic prediction performance.
Techno economic approach of biogas in Konya Türkiye
Creators: name: Eryaşar, Ahmet
Publisher: name: Taylor & Francis
Year: 2024
Subjects: subject: Medicine
subject: Environmental Sciences not elsewhere classified
subject: Ecology
subject: FOS: Biological sciences
subject: Immunology
subject: FOS: Clinical medicine
subject: Biological Sciences not elsewhere classified
subject: Cancer
subject: Science Policy
subject: Computational Biology

description: In determining biogas potential, the current number of materials that can be used in biogas production is as important as the availability and usability of the materials. Potential studies that were conducted without knowing the structures of the systems in which these materials could be evaluated give us only the theoretical upper limit that can be reached. The ‘theoretical’, ‘technical’ and ‘economic’ potential distinctions made to prevent the error from occurring unfortunately only take into account the availability of the materials, and the process sizes and properties are either very limited or not at all. This causes the facilities established by considering existing potential research to fail in implementation or operate at low capacity. In this study, the importance of the international production chain of the apparel industry in Turkey’s economy is examined. The study is based on Konya, which has a total of 1,079,644 cattle animals, 737,395 of which are dairy cattle. In the study, the number of dairy cattle with high waste collectability rates was particularly taken into consideration. Thus, the seasonal number of changes that may occur was tried to be avoided. In this study, the number of animals per farm and the distances between businesses were taken into consideration, and the biogas systems that could be installed were evaluated within this framework. Series of analysis were made under 3 different scenarios. In the first scenario, it was assumed that biogas systems would be installed by waste-generating enterprises. The installation of village-type common biogas systems was examined when possible within the scope of the second scenario. In the third scenario, the installation of district-based biogas systems was considered. Considering the difficulties in collecting the waste of enterprises with less than 50 cattle (due to the lack of regular collection systems), it is assumed that the waste of these enterprises cannot be used in village or central systems. According to the data obtained, Scenario 1 stands out in terms of creating employment and reducing environmental problems. The 3rd Scenario was the most profitable in macroeconomic terms. However, it was emphasized that the 1st and 2nd Scenarios stand out in terms of the sustainability of the systems.
Electromagnetic duality in general relativity
Creators: name: Dadhich, Naresh
Publisher: name: arXiv
Year: 1999
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: By resolving the Riemann curvature relative to a unit timelike vector into electric and magnetic parts, we consider duality relations analogous to the electromagnetic theory. It turns out that the duality symmetry of the Einstein action implies the Einstein vacuum equation without the cosmological term. The vacuum equation is invariant under interchange of active and passive electric parts giving rise to the same vacuum solutions but the gravitational constant changes sign. Further by modifying the equation it is possible to construct interesting dual solutions to vacuum as well as to flat spacetimes.
description: 18 pages, LaTEX version
Superconducting condensation energy and neutron resonance in high-Tc superconductors
Creators: name: Li, Jian-Xin
name: Mou, Chung-Yu
name: Gong, Chang-De
name: Lee, T. K.
Publisher: name: arXiv
Year: 2001
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Based on the slave-boson theory of the two-dimensional $t-t'-J$ model, we calculate the superconducting condensation energy for optimally doped and overdoped high $T_{c}$ cuprates at finite temperatures using a renormalized random phase approximation. The contributions come from the mean-field part and the antiferromagnetic spin fluctuations. In the presence of neutron resonance peak at $(π,π)$, the latter is shown to have similar temperature and doping dependences as the difference in antiferromagnetic (AF) exchange energy between the normal and the superconducting state. This difference has been proposed to be related to the superconducting condensation energy by Scalapino and White. The total condensation energy, however, is about 1/2 smaller than the proposed AF exchange energy difference and shows a more rapid decrease as the temperature rises. The doping dependence of the condensation energy is found to be consistent with experiments. In particular, near zero temperature, our result shows a good quantitative agreement with experiments.
description: 6 pages, 7 figures in ps files
Scalar field cosmology in three-dimensions
Creators: name: Oliveira-Neto, G.
Publisher: name: arXiv
Year: 2000
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We study an analytical solution to the Einstein's equations in 2+1-dimensions. The space-time is dynamical and has a line symmetry. The matter content is a minimally coupled, massless, scalar field. Depending on the value of certain parameters, this solution represents three distinct space-times. The first one is flat space-time. Then, we have a big bang model with a negative curvature scalar and a real scalar field. The last case is a big bang model with event horizons where the curvature scalar vanishes and the scalar field changes from real to purely imaginary.
description: 11 pages, Revtex, no figues. Change in the physical interpretation of the solution
A semi-schematic model for the center of mass dynamics in supercooled molecular liquids
Creators: name: Fabbian, Linda
name: Sciortino, Francesco
name: Thiery, Filippo
name: Tartaglia, Piero
Publisher: name: arXiv
Year: 1997
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: We introduce a semi-schematic mode-coupling model to describe the slow dynamics in molecular liquids, retaining explicitly only the description of the center of mass degrees of freedom. Angular degrees of freedom are condensed in a q-vector independent coupling parameter. We compare the time and q-dependence of the density fluctuation correlators with numerical data from a 250 ns long molecular dynamics simulation. Notwithstanding the choice of a network-forming liquid as a model for comparing theory and simulation, the model describes the main static and dynamic features of the relaxation in a broad q-vector range.
description: Revtex, 2 figures
title: Καλλιεργώ, κτίζω, κατοικώ
titleType: AlternativeTitle
title: Cultivate, build, dwell
Creators: name: Karydi, Myrto
Publisher: name: National Technological University of Athens
Year: 2014
Subjects: Καλλιεργώ
Κτίζω
Κατοικώ
Οικοκοινότητες
Μαρόκο
Δόμηση με φυσικά υλικά
Cultivate
Build
Dwell
Eco villages
Morocco
Natural building

description: The cause of the essay was my journey to the village Old M’hamid in Morocco at May 2013, because of a workshop of construction with earth. The essay investigates the need of finding an alternative way of living, especially in a period of economic and ecological crisis. In this intense research people create new communities, the Eco villages, where they rethink the way they cultivate the land, the way they build and finally the way they inhabit. In the first part of the essay, there is a research of the basic principles of design, construction and living of a traditional community, the village Old M’hamid in Morocco. And on the second part there is a research of the Eco villages, mostly in Greece. The Eco villages are communities, which take some principles from the traditional way of living, and improve them with recent needs and with modern technics and technology.