cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
SUPERVISION AND TRANSACTION COSTS: EVIDENCE FROM RICE FARMS IN BICOL, THE PHILIPPINES
Creators: name: Evenson, Robert E.
name: Kimhi, Ayal
name: Desilva, Sanjaya
name: Evenson, Robert E.
name: Kimhi, Ayal
name: Desilva, Sanjaya
Publisher: name: Unknown
Year: 2000
Subjects: Crop Production/Industries

description: Labor markets in all economies are subject to transaction costs associated with recruiting, monitoring and supervising workers. The level of transaction costs affects labor and land contract choices and family labor advantages. Rural labor markets in developing economies, where institutions such as labor and contract law and formal employment assistance mechanisms are not in place, are regarded to be particularly sensitive to transaction cost conditions. A number of studies of contract choice support this contention. The inherent difficulty of measuring transaction costs, however, has limited studies on this topic. In this paper, we analyze supervision activities reported in a cross-section survey of rice farmers in the Bicol region of the Philippines. This survey is unique because it provides supervision data at the farm task level in addition to information on production activities and household characteristics over a range of institutional conditions. It also provides barangay (village) level variables that help us to quantify institutional conditions. The data show that family workers either work or supervise, but do not do both at the same time. This is consistent with a simple optimization model in which supervision intensity increases the productivity of hired workers, which is assumed to be lower than that of family members due to the transaction costs. The model predicts that supervision intensity will increase with transaction costs. We use different institutional conditions to proxy for transaction costs, and estimate the demand for supervision time for four different classes of rice production tasks. The estimation strategy controls for selectivity due to two sources: not all farms use hired labor, and not all farms that use hired labor actually supervise. The results indeed show a positive effect of transaction costs on supervision intensity. We then extend the analysis to a farm efficiency specification to test the proposition that supervision activities improve farm efficiency. This framework allows us to relate institutional conditions to farm efficiency directly and indirectly through their effect on supervision activities. We find that transaction costs have a negative direct effect on farm efficiency, but this is partially offset by increased supervision intensity which enhances efficiency. The results enable us to associate institutional conditions with transaction costs and to draw policy inferences regarding the value of improved institutional conditions.
Well-posedness of the scale-invariant tetrad formulation of the vacuum Einstein equations
Creators: name: Garfinkle, David
name: Gundlach, Carsten
Publisher: name: arXiv
Year: 2005
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We show that with a small modification, the formulation of the Einstein equations of Uggla et al, which uses tetrad variables normalised by the expansion, is a mixed symmetric hyperbolic/parabolic system. Well-posedness of the Cauchy problem follows from a standard theorem.
description: Added section on the well-posedness of the constraint evolution system
THE SIGNIFICANCE OF INTERCEPTIONS OF FRESH PRODUCE FROM LATIN AMERICA AND THE CARIBBEAN INTO THE UNITED STATES
Creators: name: Narrod, Clare A.
name: Malcolm, Scott A.
name: Kost, William E.
name: Narrod, Clare A.
name: Malcolm, Scott A.
name: Kost, William E.
Publisher: name: Unknown
Year: 2000
Subjects: International Relations/Trade

description: This paper develops a method to examine data on fresh produce imports from Latin America and the Caribbean into the United States from 1993-1999 to determine: 1) if there are significant differences in frequency of interceptions for a specific product for the region or a specific country within the region, and 2) whether significant changes in trade flows for specific products have occurred between points of origin and ports of entry. The results show that there are indeed differences between countries with respect to interception frequency, however current data on the fumigation frequency for a commodity/country or commodity/port of entry is not sufficient to determine the causes that underlie differences in frequencies between countries.
Mass spectrometric analyses of high performance polymers to assess radiopurity as ultra low background materials for rare event physics detectors
Creators: name: Grate, Jay W.
name: Arnquist, Isaac J.
name: Hoppe, Eric W.
name: Bliss, Mary
name: Harouaka, Khadouja
name: di Vacri, Maria Laura
name: Anguiano, Sonia Alcantar
Publisher: name: arXiv
Year: 2020
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: The mass concentrations of Th-232 and U-238 in several strong, unfilled, high performance polymers are reported as measures of their radiopurity. Highly radiopure polymers are required as dielectric materials in the construction of rare event physics detectors, in order to minimize background signals arising from the detector materials themselves. New data are reported for carefully sourced samples of polyetheretherketone (PEEK), polyetherketoneketone (PEKK), a polyamide imide (PAI, branded as Torlon) and polybenzimidazole (PBI). Data for solid polyetherimide (PEI) are also discussed and new data for PEI in the form of a commercial 3D printing filament stock are reported. Strong high performance polymers PEKK, PBI, PAI and PEI were found with levels for Th-232 and U-238 that are below one milliBq/kg, including the PEI 3D printing filament. Specifically, for Th-232 and U-238 respectively, in microBq/kg, we found values of 149 and 184 for Arkema Kepstan PEKK 6002 flake; 69 and 2250 for Solvay Ketaspire PEEK flake; 346 and 291 for PBI Performance Products low metals grade 100 mesh PBI powder; 66 and 105 for Drake Plastics PAI Torlon T-4200 pellets; 401 and 285 for Drake Plastics cured PAI rod; 32 and 41 for Ensinger PEI Ultem 1000 solid; and 15 and 85 microBq/kg, for ThermaX PEI Ultem 1010 filament material. These results were all obtained using a novel dry ashing method in crucibles constructed of ultra low background (ULB) electroformed copper. Samples were spiked with T-229h and U-233 as internal standards prior to ashing and determinations were made by inductively coupled plasma mass spectrometry (ICP-MS). Radiopurity is displayed graphically relative to numerical measures of mechanical strength for these and several other polymers.
ECONOMIC THRESHOLDS: AN APPLICATION TO FLORICULTURE
Creators: name: Schumacher, Sara K.
name: Marsh, Thomas L.
name: Williams, Kimberly A.
name: Schumacher, Sara K.
name: Marsh, Thomas L.
name: Williams, Kimberly A.
Publisher: name: Unknown
Year: 2000
Subjects: Crop Production/Industries

description: This paper introduces conjunctive optimal pest management and production decision rules applied to the floriculture industry. A grower is faced with optimally controlling multiple pests and applying cultural controls to maximize the expected net present value of benefits within a discrete time framework, subject to biological and marketing constraints.
On the increase with relative distances of light cone operator product of currents and related phenomena
Creators: name: Blok, B.
name: Frankfurt, L.
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We show that in QCD in the leading twist approximation flavor singlet light cone current-current correlators increase with distances rapidly similar to the correlator of velocities in turbulence and argue that this property is precursor of phase transitions in high energy processes . It is shown that absence of spatial oscillations of current-current correlators follows from asymptotic freedom in QCD. We discuss also influence of this new long-range interaction on the wave function of dipole in high energy DIS processes near the black disc limit.
description: 10 pages, several misprints eliminated, detailed explanation is added on the change of dipole size, wave function and coherence length near the unitarity limit
Coxeter orbits and modular representations
Creators: name: Bonnafé, Cédric
name: Rouquier, Raphaël
Publisher: name: arXiv
Year: 2005
Subjects: subject: Representation Theory (math.RT)
subject: FOS: Mathematics
subject: 20C33, 20C20

description: We study the modular representations of finite groups of Lie type arising in the cohomology of certain quotients of Deligne-Lusztig varieties associated with Coxeter elements. These quotients are related to Gelfand-Graev representations and we present a conjecture on the Deligne-Lusztig restriction of Gelfand-Graev representations. We prove the conjecture for restriction to a Coxeter torus. We deduce a proof of Broué's conjecture on equivalences of derived categories arising from Deligne-Lusztig varieties, for a split group of type $A\_n$ and a Coxeter element. Our study is based on Lusztig's work in characteristic 0.
description: 24 pages
Exoplanet detection and its dependence on stochastic sampling of the stellar Initial Mass Function
Creators: name: Bottrill, Amy L.
name: Haigh, Molly E.
name: Hole, Madeleine R. A.
name: Theakston, Sarah C. M.
name: Allen, Rosa B.
name: Grimmett, Liam P.
name: Parker, Richard J.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Young Moving Groups (YMGs) are close (<100pc), coherent collections of young (<100Myr) stars that appear to have formed in the same star-forming molecular cloud. As such we would expect their individual initial mass functions (IMFs) to be similar to other star-forming regions, and by extension the Galactic field. Their close proximity to the Sun and their young ages means that YMGs are promising locations to search for young forming exoplanets. However, due to their low numbers of stars, stochastic sampling of the IMF means their stellar populations could vary significantly. We determine the range of planet-hosting stars (spectral types A, G and M) possible from sampling the IMF multiple times, and find that some YMGs appear deficient in M-dwarfs. We then use these data to show that the expected probability of detecting terrestrial magma ocean planets is highly dependent on the exact numbers of stars produced through stochastic sampling of the IMF.
description: 11 pages (7 pages of main text), 2 figures (+ 3 in appendix), 3 tables. ApJ in press
Intersecting red and blue line segments in optimal time and precision
Creators: name: Mantler, Andrea
Publisher: name: University of British Columbia
Year: 2009

description: In this thesis we describe a new algorithm, SPAGHETTISWEEP, for solving the red-blue line segment intersection problem. We use a symmetric lazy sweep and at most degree two predicates. Our method is numerically robust, and handles all degeneracies in the input data. Our algorithm finds all intersecting pairs of segments in O(n log n + k) time and O(n) space, where n is the total number of segments, and k is the number of intersection points. With a small modification, we are able to count intersections in O(n log n) time and O(n) space. Using only degree two predicates, we are also able to compute the arrangement in O(n log n + k) time.
Wigner function statistics in classically chaotic systems
Creators: name: Horvat, Martin
name: Prosen, Tomaz
Publisher: name: arXiv
Year: 2006
Subjects: subject: Quantum Physics (quant-ph)
subject: Chaotic Dynamics (nlin.CD)
subject: FOS: Physical sciences

description: We have studied statistical properties of the values of the Wigner function W(x) of 1D quantum maps on compact 2D phase space of finite area V. For this purpose we have defined a Wigner function probability distribution P(w) = (1/V) int delta(w-W(x)) dx, which has, by definition, fixed first and second moment. In particular, we concentrate on relaxation of time evolving quantum state in terms of W(x), starting from a coherent state. We have shown that for a classically chaotic quantum counterpart the distribution P(w) in the semi-classical limit becomes a Gaussian distribution that is fully determined by the first two moments. Numerical simulations have been performed for the quantum sawtooth map and the quantized kicked top. In a quantum system with Hilbert space dimension N (similar 1/hbar) the transition of P(w) to a Gaussian distribution was observed at times t proportional to log N. In addition, it has been shown that the statistics of Wigner functions of propagator eigenstates is Gaussian as well in the classically fully chaotic regime. We have also studied the structure of the nodal cells of the Wigner function, in particular the distribution of intersection points between the zero manifold and arbitrary straight lines.
description: 22 pages, 13 figures (20 .eps files)
A NOTE ON THE ECONOMICS OF GRAZING AND ITS EXPERIMENTAL INVESTIGATION
Creators: name: Dillon, John L.
name: Burley, Harry T.
name: Dillon, John L.
name: Burley, Harry T.
Publisher: name: Unknown
Year: 1961
Subjects: Livestock Production/Industries

description: Some notes prove something ; others disprove something. This one does neither. It merely sketches a simple model of the grazing complex. Of itself, the model is no more than an attempt to specify the more important economic relationships of the grazing complex in an explicit, orderly fashion. Although of undoubted importance, these relationships so far appear to have received little attention. Despite its naivete, the model establishes the virtual impossibility of estimating the parameters ideally needed to specify a profit maximizing system of grazing, even if we assume away climatic and price uncertainty, and the diversity of pasture types, history and location. On the positive side, the model suggests a framework for assessing grazing experiments in terms of their relevance for economic analysis (which, of course, is not to be confused with the simple cost accounting of most agricultural experimenters). Concomitantly, the model gives some clues to the experimental approach needed for the elucidation of the economics of grazing. In illustration, a few examples are presented of the types of experimental design that are perhaps best suited for investigation of the grazing complex.
Stability of the essential spectrum for 2D--transport models with Maxwell boundary conditions
Creators: name: Lods, B.
name: Sbihi, M.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Mathematical Physics (math-ph)
subject: Spectral Theory (math.SP)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: We discuss the spectral properties of collisional semigroups associated to various models from transport theory by exploiting the links between the so-called resolvent approach and the semigroup approach. Precisely, we show that the essential spectrum of the full transport semigroup coincides with that of the collisionless transport semigroup in any $L^p$--spaces $(1
description: 23 pages
String breaking in QCD: dual superconductor vs. stochastic vacuum model
Creators: name: Antonov, D.
name: Di Giacomo, A.
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Effects of dispersion of the chromoelectric field of the flux tube on the string-breaking distance are studied. The leading-order correction is shown to slightly diminish the result following from the Schwinger formula. Instead, accounting for corrections of all orders might result, at certain values of the Landau-Ginzburg parameter, in an increase of the string-breaking distance up to one order of magnitude. An alternative formula for this distance is obtained when produced pairs are treated as holes in a confining pellicle, which spans over the contour of an external quark-antiquark pair. Generalizations of the obtained results to the cases of small temperatures, as well as temperatures close to the critical one are also discussed.
description: 21 pages, no figures, uses JHEP3.cls
Mengenal Indeksasi WoS dan tips mudah terindeks
Creators: name: Faizal
Publisher: name: Zenodo
Year: 2021
Subjects: WoS, Web of Science, ESCI, ESCI WoS, Register Journal, IAIN Salatiga, RJI Jateng, RJI Jateng Peduli Semeru, RJI, Relawan Jurnal Indonesia

description: Web of Science (sebelumnya dikenal sebagai Web of Knowledge) adalah layanan pengindeksan sitiran ilmiah berbasis langganan daring. Web of Science (WoS) adalah salah satu database rujukan global terbesar dan paling terkemuka. File PDF ini adalah materi berjudul Mengenal Indeksasi WoS dan tips mudah terindeks. Materi ini diunggah sebagai materi RJI Jawa Tengah Peduli Semeru yang diadakan hari selasa, 21 Desember 2021. Pengalaman mengelola jurnal terindeks di ESCI Web of Science cukup menarik bagi saya. Di satu sisi, ada orang yang berpendapat ESCI WoS itu adalah sekadar indexing kelas menengah sejenis DOAJ, EBSCO, ACI bahkan ada yang bilang ESCI WoS itu indexing setengah hati yang belum masuk core collections Web of Science. Core collection dalam konteks ini adalah produk web of Science yang masuk indexing kelas tinggi yaitu SSCI, SCIE dan AHCI. Di sisi yang lain sejatinya ESCI sudah masuk core collection tapi belum punya Impact Factor dan setidaknya ada Point positif jika sebuah jurnal terindeks di ESCI Web of Science: ESCI Web of Science adalah jalan lain untuk internasionalisasi jurnal. Bagi pengelola jurnal yang masih belum berani mendaftarkan jurnal ke Scopus/mungkin sudah mendaftar tapi kena embargo. Internasionalisasi jurnal maksudnya akan banyak peminat dari Foreign authors seperti: Turki, Rusia, Pakistan, Iran, Thailand, Malaysia yang tertarik dan menganggap tinggi produk apapun dari WoS meskipun sekadar ESCI WoS.
Multiwavelength Analysis of the Variability of the Blazar 3C 273
Creators: name: Fernandes, Sunil
name: Patiño-Álvarez, Víctor M.
name: Chavushyan, Vahram
name: Schlegel, Eric M.
name: Valdés, José Ramón
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present multiwavelength light curves and polarimetric data of the Flat Spectrum Radio Quasar 3C 273 over 8 years. The wavelength range of our data set extends from radio to gamma-rays. We found that the optical emission in this source is dominated by the accretion disk during the entire time-frame of study. We additionally find that in contrast with the observed behaviour in other blazars, 3C 273 does not show a correlation between the gamma-ray spectral index and the gamma-ray luminosity. Finally, we identified an anti-correlation between the 15 GHz and V-band light curves for the time-range $JD_{245} = 4860 - 5760$, which we speculate is the consequence of the inner part of the accretion disk falling into the black hole, followed by the ejection of a component into the jet.
description: 14 pages, 11 figures, 3 tables
Note about Static D1-brane in I-brane Background
Creators: name: Kluson, J.
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In this short note we will construct the static solutions on the world volume of D1-brane embedded in I-brane background.
description: 20 pages, reference added
Proper Motions of Dwarf Spheroidal Galaxies from Hubble Space Telescope Imaging. IV: Measurement for Sculptor
Creators: name: Piatek, S.
name: Pryor, C.
name: Bristow, P.
name: Olszewski, E. W.
name: Harris, H. C.
name: Mateo, M.
name: Minniti, D.
name: Tinney, C. G.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: This article presents a measurement of the proper motion of the Sculptor dwarf spheroidal galaxy determined from images taken with the Hubble Space Telescope using the Space Telescope Imaging Spectrograph in the imaging mode.
description: 38 pages, 15 figures, 6 tables, Accepted for publication in AJ, March 2006
Series of Bulk Magnetic Phase Transitions in NaxCoO2: a muSR study
Creators: name: Mendels, P.
name: Bono, D.
name: Bobroff, J.
name: Collin, G.
name: Colson, D.
name: Blanchard, N.
name: Alloul, H.
name: Mukhamedshin, I.
name: Bert, F.
name: Amato, A.
name: Hillier, A. D.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Using muon spin rotation, well-defined bulk ~ 100% magnetic phases in NaxCoO2 are revealed. A novel magnetic phase is detected for x = 0.85 with the highest transition temperature ever observed for x >= 0.75. This stresses the diversity of x >=0.75 magnetic phases and the link between magnetic and structural degrees of freedom. For the charge-ordered x = 0.50 compound, a cascade of transitions is observed below 85 K. From a detailed analysis of our data, we conclude that the ordered moment varies continuously with temperature and suggest that the two secondary transitions at 48 K and 29 K correspond to a moderate reorientation of antiferromagnetically coupled moments.
description: Sumitted to Phys. Rev. Lett., 1 Oct 2004, revised version
Breakdown signatures of the phenomenological Lindblad master equation in the strong optomechanical coupling regime
Creators: name: Betzholz, Ralf
name: Taketani, Bruno G.
name: Torres, Juan Mauricio
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The Lindblad form of the master equation has proven to be one of the most convenient ways to describe the impact of an environment interacting with a quantum system of interest. For single systems the jump operators characterizing these interactions usually take simple forms with a clear interpretation. However, for coupled systems these operators take significantly different forms and the full dynamics cannot be described by jump operators acting on the individual subsystems only. In this work, we investigate the differences between a common phenomenological model for the master equation and the more rigorous dressed-state master equation for optomechanical systems. We provide an analytical method to obtain the absorption spectrum of the system for both models and show the breakdown of the phenomenological model in both the bad cavity and the ultra-strong coupling limit. We present a careful discussion of the indirect dephasing of the optical cavity in both models and its role in the differences of their predicted absorption spectra. Our work provides a simple experimental test to determine whether the simpler phenomenological model can be used to describe the system and is a step forward toward a better understanding of the role of the coupling between subsystems for open-quantum-system dynamics.
description: 12 pages, 3 figures
Entangling logical qubits with lattice surgery
Creators: name: Erhard, Alexander
name: Nautrup, Hendrik Poulsen
name: Meth, Michael
name: Postler, Lukas
name: Stricker, Roman
name: Ringbauer, Martin
name: Schindler, Philipp
name: Briegel, Hans J.
name: Blatt, Rainer
name: Friis, Nicolai
name: Monz, Thomas
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Future quantum computers will require quantum error correction for faithful operation. The correction capabilities come with an overhead for performing fault-tolerant logical operations on the encoded qubits. One of the most resource efficient ways to implement logical operations is lattice surgery, where groups of physical qubits, arranged on lattices, can be merged and split to realize entangling gates and teleport logical information. Here, we report on the experimental realization of lattice surgery between two topologically encoded qubits in a 10-qubit ion trap quantum information processor. In particular, we demonstrate entanglement between two logical qubits and we implement logical state teleportation.
description: 6+9 pages, 10 figures, 3 tables
Two dimensional electron gas in a non-Euclidean space
Creators: name: Filho, R. N. Costa
name: Oliveira, S. F. S.
name: Aguiar, V.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: A charged particle in the presence of a magnetic field is studied in the position dependent operator formalism. Instead of a quantum harmonic oscillator, the solution of the resulting Schrödinger-like equation is the one for the Morse oscillator. The anharmonicity that shows up naturally from the theory is analogous to the corrections introduced by relativistic ones.The degeneracy of the spin up and down levels is lifted due to the non-Euclidean space. It is shown that the Fermi energy and the total ground state energy of the 2DEG is also modified.
description: 4 pages, 4 figures
Bredon homology and equivariant K-homology of SL(3,Z)
Creators: name: Sanchez-Garcia, Ruben
Publisher: name: arXiv
Year: 2006
Subjects: subject: K-Theory and Homology (math.KT)
subject: Algebraic Topology (math.AT)
subject: FOS: Mathematics
subject: 19L47, 55N91 (Primary); 19K99, 46L80 (Secondary)

description: We obtain the equivariant K-homology of the classifying space \underline{E}SL(3,Z) from the computation of its Bredon homology with respect to finite subgroups and coefficients in the representation ring. We also obtain the corresponding results for GL(3,Z). Our calculations give therefore the topological side of the Baum-Connes conjecture for these groups.
description: 16 pages, 2 figures; v2 - one reference updated, submitted to K-Theory
Schaeder, Hildegard, Autokratie und Heilige Allianz
Creators: name: Engler, Heinz
Publisher: name: Ökumenische Rundschau
Year: 2025

description: Ökumenische Rundschau, Bd. 13 Nr. 4 (1964): Ökumenische Rundschau, Band 13, Heft 4
UntitIdentification and Characterization of Novel Corona and Associated Respiratory Viruses in Aerosolsled Item
Creators: name: Habibi, Nazima
name: Uddin, Saif
name: Al-Salameen, Fadila
name: Amad, Sami Al
name: Kumar, Vinod
name: Mohd Otaibi
Publisher: name: figshare
Year: 2021
Subjects: subject: 60506 Virology
subject: FOS: Biological sciences
subject: Molecular Biology

description: Final Report
The lifetimes of planetary debris discs around white dwarfs
Creators: name: Veras, Dimitri
name: Heng, Kevin
Publisher: name: arXiv
Year: 2020
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: The lifetime of a planetary disc which orbits a white dwarf represents a crucial input parameter into evolutionary models of that system. Here we apply a purely analytical formalism to estimate lifetimes of the debris phase of these discs, before they are ground down into dust or are subject to sublimation from the white dwarf. We compute maximum lifetimes for three different types of white dwarf discs, formed from (i) radiative YORP breakup of exo-asteroids along the giant branch phases at 2-100 au, (ii) radiation-less spin-up disruption of these minor planets at $\sim 1.5-4.5R_{\odot}$, and (iii) tidal disruption of minor or major planets within about $1.3R_{\odot}$. We display these maximum lifetimes as a function of disc mass and extent, constituent planetesimal properties, and representative orbital excitations of eccentricity and inclination. We find that YORP discs with masses up to $10^{24}$ kg live long enough to provide a reservoir of surviving cm-sized pebbles and m- to km-sized boulders that can be perturbed intact to white dwarfs with cooling ages of up to 10 Gyr. Debris discs formed from the spin or tidal disruption of these minor planets or major planets can survive in a steady state for up to respectively 1 Myr or 0.01 Myr, although most tidal discs would leave a steady state within about 1 yr. Our results illustrate that dust-less planetesimal transit detections are plausible, and would provide particularly robust evolutionary constraints. Our formalism can easily be adapted to individual systems and future discoveries.
description: Accepted for publication in MNRAS
GEO Dialogue Series (2023)
Creators: name: GEO Data Working Group
Publisher: name: GEO Knowledge Hub
Year: 2024

description: GEO Dialogue Series 2023 is the second season of webinars organized by the Group on Earth Observations (GEO).
The GEO Dialogue Series 2023 focuses on the GEO Open Knowledge statement.
In the dialogue series, we discuss each component of Open Knowledge and how we can progress from open data sharing, supported by the GEO data management principles, to the FAIR, CARE, and TRUST principles, ultimately achieving open knowledge. Open Knowledge encompasses open science, open knowledge in administrations, operations, policy making, and industry (transparency). The dialogues integrate legal aspects and in-situ data and information perspectives either explicitly or as integral parts of the presentations and discussions.
The GEO Dialogue Series is open to everyone. Please use the following link to register for the upcoming Dialogue. Join the Dialogues
This package contains all the presentations and auxiliary materials produced in the context of the GEO Dialogue Series 2023. Each Dialogue has specific Knowledge Resources where you can learn more about the concepts of Open Data and Open Knowledge.
Package Structure

GEO Dialogue Series 1: What are Open Knowledge and Open Science in Earth observation?
GEO Dialogue Series 2: Open data, open access
GEO Dialogue Series 3: Open Reproducible Research
GEO Dialogue Series 4: Open Software, Open Infrastructure, Open Hardware
GEO Dialogue Series 5: Open Education, Open Evaluation
GEO Dialogue Series 6: Citizen and Participatory Science
GEO Dialogue Series 6bis: Overarching Goals of Open Knowledge
GEO Dialogue Series 7: Diversity of Knowledge
GEO Dialogue Series 8: How to go towards Open Knowledge for GEO
GEO Dialogue Series 9: Self Assessment Tool progress
Planet Migration in Self-Gravitating Discs: Survival of Planets
Creators: name: Rowther, Sahl
name: Meru, Farzana
Publisher: name: arXiv
Year: 2020
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: We carry out three-dimensional SPH simulations to study whether planets can survive in self-gravitating protoplanetary discs. The discs modelled here use a cooling prescription that mimics a real disc which is only gravitationally unstable in the outer regions. We do this by modelling the cooling using a simplified method such that the cooling time in the outer parts of the disc is shorter than in the inner regions, as expected in real discs. We find that both giant (> M_Sat) and low mass (< M_Nep) planets initially migrate inwards very rapidly, but are able to slow down in the inner gravitationally stable regions of the disc without needing to open up a gap. This is in contrast to previous studies where the cooling was modelled in a more simplified manner where regardless of mass, the planets were unable to slow down their inward migration. This shows the important effect the thermodynamics has on planet migration. In a broader context, these results show that planets that form in the early stages of the discs' evolution, when they are still quite massive and self-gravitating, can survive.
description: 13 pages, 14 figures, accepted for publication in MNRAS
Measurement of branching fractions and mass spectra of B -> K pi pi gamma
Creators: name: Aubert, B.
name: Collaboration, BABAR
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: We present a measurement of the partial branching fractions and mass spectra of the exclusive radiative penguin processes B -> K pi pi gamma in the range m_Kpipi < 1.8 GeV/c^2. We reconstruct four final states: K+ pi- pi+ gamma, K+ pi- pi0 gamma, Ks pi- pi+ gamma, and Ks pi+ pi- gamma, where Ks -> pi+ pi-. Using 232 million e+ e- -> B Bbar events recorded by the BaBar experiment at the PEP-II asymmetric-energy storage ring, we measure the branching fractions BR(B+ -> K+ pi- pi+ gamma) = (2.95 +- 0.13 (stat.) +- 0.20 (syst.)) x 10^-5, BR(B0 -> K+ pi- pi0 gamma) = (4.07 +- 0.22 (stat.) +- 0.31 (syst.)) x 10^-5, BR(B0 -> K0 pi+ pi- gamma) = (1.85 +- 0.21 (stat.) +- 0.12 (syst.)) x 10^-5, and BR(B+ -> K0 pi+ pi0 gamma) = (4.56 +- 0.42 (stat.) +- 0.31 (syst.)) x 10^-5.
description: 7 pages, 2 postscript figures, published in Physical Review Letters v98, 211804; Report-no: BABAR-PUB-05/31, SLAC-PUB-11288, includes erratum to Table I
Major Statistical Series of the U.S. Department of Agriculture: Supplement
Creators: name: Economic Research Service
name: Economic Research Service
Publisher: name: Unknown
Year: 1991
Subjects: Research Methods/ Statistical Methods

description: This supplement summarizes major changes to the procedures described in the 12 volumes of Major Statistical Series of the U.S. Department of Agriculture (AH-671) published between 1987 and 1990. In the past, the handbook was revised after about 15 years, but with the pace of change increasing, some volumes of the last handbook are now being revised after only 3-4 years.
description: Volumes in the Agriculture Handbook No. 671 are: 1. Agricultural Prices, Expenditures, Farm Employment, and Wages 2. Agricultural Production and Efficiency 3. Farm Income 4. Agricultural Marketing Costs and Charges 5. Consumption and Utilization of Agricultural Products 6. Land Values and Land Use 7. Crop and Livestock Estimates 8. Farmer Cooperatives 9. Market News 10. International Agricultural Statistics 11. The Balance Sheet 12. Costs of Production
Renkewitz, Heinz, Die Kirchen auf dem Wege zur Einheit
Creators: name: Rott, Ludwig
Publisher: name: Ökumenische Rundschau
Year: 2025

description: Ökumenische Rundschau, Bd. 13 Nr. 4 (1964): Ökumenische Rundschau, Band 13, Heft 4
title: Cross-Scale Vulnerability Assessment for Smallholder Farming
title: A Case Study from the Northeast of Brazil
titleType: Subtitle
Creators: name: Dobkowitz, Sophia
name: Walz, Ariane
name: Baroni, Gabriele
name: Pérez-Marin, Aldrin M.
Publisher: name: Universität Potsdam
Year: 2020

description: Climate change heavily impacts smallholder farming worldwide. Cross-scale vulnerability assessment has a high potential to identify nested measures for reducing vulnerability of smallholder farmers. Despite their high practical value, there are currently only limited examples of cross-scale assessments. The presented study aims at assessing the vulnerability of smallholder farmers in the Northeast of Brazil across three scales: regional, farm and field scale. In doing so, it builds on existing vulnerability indices and compares results between indices at the same scale and across scales. In total, six independent indices are tested, two at each scale. The calculated indices include social, economic and ecological indicators, based on municipal statistics, meteorological data, farm interviews and soil analyses. Subsequently, indices and overlapping indicators are normalized for intra- and cross-scale comparison. The results show considerable differences between indices across and within scales. They indicate different activities to reduce vulnerability of smallholder farmers. Major shortcomings arise from the conceptual differences between the indices. We therefore recommend the development of hierarchical indices, which are adapted to local conditions and contain more overlapping indicators for a better understanding of the nested vulnerabilities of smallholder farmers.
description: Postprints der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe, 978
Arid or Cloudy: Characterizing the Atmosphere of the super-Earth 55 Cancri e using High-Resolution Spectroscopy
Creators: name: Jindal, Abhinav
name: de Mooij, Ernst J. W.
name: Jayawardhana, Ray
name: Deibert, Emily K.
name: Brogi, Matteo
name: Rustamkulov, Zafar
name: Fortney, Jonathan J.
name: Hood, Callie E.
name: Morley, Caroline V.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: The nearby super-Earth 55 Cnc e orbits a bright (V = 5.95 mag) star with a period of ~ 18 hours and a mass of ~ 8 Earth masses. Its atmosphere may be water-rich and have a large scale-height, though attempts to characterize it have yielded ambiguous results. Here we present a sensitive search for water and TiO in its atmosphere at high spectral resolution using the Gemini North telescope and the GRACES spectrograph. We combine observations with previous observations from Subaru and CFHT, improving the constraints on the presence of water vapor. We adopt parametric models with an updated planet radius based on recent measurements, and use a cross-correlation technique to maximize sensitivity. Our results are consistent with atmospheres that are cloudy or contain minimal amounts of water and TiO. Using these parametric models, we rule out a water-rich atmosphere (VMR >= 0.1%) with a mean molecular weight of <= 15 g/mol at a 3 sigma confidence level, improving on the previous limit by a significant margin. For TiO, we rule out a mean molecular weight of <= 5 g/mol with a 3 sigma confidence level for a VMR greater than 10^-8; for a VMR of greater than 10^-7, the limit rises to a mean molecular weight of <= 10 g/mol. We can rule out low mean-molecular-weight chemical equilibrium models both including and excluding TiO/VO at very high confidence levels (> 10 sigma). Overall, our results are consistent with an atmosphere with a high mean molecular weight and/or clouds, or no atmosphere.
description: 15 pages, 12 figures, 1 table
USES AND LIMITATIONS OF FARM SURVEYS
Creators: name: Schapper, Henry P.
name: Schapper, Henry P.
Publisher: name: Unknown
Year: 1957
Subjects: Farm Management

description: Farm surveys are an indispensable tool for use at all levels of agricultural policy and in important phases in agricultural economics research. This paper is an attempt to synthesise some of the more important recent discussions that have centred round the roles of surveys in economics in general and in farming in particular. Farm surveys are comparatively recent in Australia. There is need for more of them, covering not only technical and financial data, but personal, subjective and institutional data also. Such surveys should be regarded as prerequisites for more effective policy-making in agriculture, and as such, provision for them should be incorporated within policy for its guidance and evaluation.
Solar Neutrinos: Spin Flavour Precession and LMA
Creators: name: Pulido, Joao
name: Chauhan, B. C.
name: Raghavan, R. S.
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The time dependence that appears to be hinted by the data from the first 13 years of the solar neutrino Gallium experiments is viewed as resulting from a partial conversion of active neutrinos to light sterile ones through the resonant interaction between the magnetic moment of the neutrino and a varying solar field. A summary of the model and its predictions are presented for the forthcoming experiments Borexino and LENS.
description: 6 pages, 3 figures, contribution to 12th Lomonosov Conference in Elementary Particle Physics, Moscow, Aug 24-31 (2005)
A Census of Star Formation in the Outer Galaxy II: The GLIMPSE360 Field
Creators: name: Winston, Elaine
name: Hora, Joseph
name: Tolls, Volker
Publisher: name: arXiv
Year: 2020
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We have conducted a study of star formation in the outer Galaxy from 65\degr$< l $180\degr\ in Galactic longitude. Using the $DBSCAN$ method on the combined catalog, we identify 618 clusters or aggregations of YSOs having 5 or more members. We identify 10,476 Class I, 29,604 Class II, and 7,325 anemic Class II/Class III YSOs. The ratio of YSOs identified as members of clusters was 25,528/47,338, or 54\%. We found 100 of the clusters identified have previously measured distances in the {\it WISE} \ion{H}{2} survey. We used these distances in our spectral energy distribution (SED) fitting of the YSOs in these clusters, of which 96 had YSOs with $<3σ$ fits. We used the derived masses from the SED model fits to estimate the initial mass function (IMF) in the inner and outer Galaxy clusters: dividing the clusters by Galactocentric distances, the slopes were $Γ= 1.87 \pm 0.31$ above 3~M$_{\odot}$ for $R_{Gal} < 11.5$~kpc and $Γ= 1.15 \pm 0.24$ above 3~M$_{\odot}$ for $R_{Gal} > 11.5$~kpc. The slope of the combined IMF was found to be $Γ= 1.92 \pm 0.42$ above 3~M$_{\odot}$. These values are consistent with each other within the uncertainties, and with literature values in the inner Galaxy high-mass star formation regions. The slopes are likely also consistent with a universal Salpeter IMF.
description: 25 pages, 14 figures
Effect of electronic interactions on the persistent current in one-dimensional disordered rings
Creators: name: Gambetti, E.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: The persistent current is here studied in one-dimensional disordered rings that contain interacting electrons. We used the density matrix renormalization group algorithms in order to compute the stiffness, a measure that gives the magnitude of the persistent currents as a function of the boundary conditions for different sets of both interaction and disorder characteristics. In contrast to its non-interacting value, an increase in the stiffness parameter was observed for systems at and off half-filling for weak interactions and non-zero disorders. Within the strong interaction limit, the decrease in stiffness depends on the filling and an analytical approach is developed to recover the observed behaviors. This is required in order to understand its mechanisms. Finally, the study of the localization length confirms the enhancement of the persistent current for moderate interactions when disorders are present at half-filling. Our results reveal two different regimes, one for weak and one for strong interactions at and off half-filling.
description: 16 pages, 21 figures; minor changes (blanks missing, sentences starting with a mathematical symbol)
MONITORAMENTO DA QUALIDADE DA ÁGUA DE RIOS NO BRASIL
Creators: name: NASCIMENTO, F. J. M.
Publisher: name: Zenodo
Year: 2024
Subjects: RECURSOS HÍDRICOS
ÁGUA
MONITORAMENTO DE QUALIDADE

description: O resumo simples, intitulado "Monitoramento da Qualidade da Água de Rios no Brasil", foi submetido ao III Congresso Brasileiro Online de Ensino, Pesquisa e Extensão em 2024, organizado pela Sociedade Brasileira de Eventos Científicos (SOBREC). O autor, Fernando Jeferson de Macedo Nascimento, cuja referência de citação é "Nascimento, F. J. M.", apresentou o trabalho com o objetivo de divulgar conhecimento e incentivar o pensamento científico sobre o monitoramento da qualidade da água em rios brasileiros. O evento busca conectar a divulgação científica, o ensino e a extensão acadêmica, visando atingir um amplo público interessado nessa temática.
The synchrotron maser emission from relativistic magnetized shocks: Dependence on the pre-shock temperature
Creators: name: Babul, Aliya-Nur
name: Sironi, Lorenzo
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Electromagnetic precursor waves generated by the synchrotron maser instability at relativistic magnetized shocks have been recently invoked to explain the coherent radio emission of Fast Radio Bursts. By means of two-dimensional particle-in-cell simulations, we explore the properties of the precursor waves in relativistic electron-positron perpendicular shocks as a function of the pre-shock magnetization $σ\gtrsim 1$ (i.e., the ratio of incoming Poynting flux to particle energy flux) and thermal spread $Δγ\equiv kT/mc^2=10^{-5}-10^{-1}$. We measure the fraction $f_ξ$ of total incoming energy that is converted into precursor waves, as computed in the post-shock frame. At fixed magnetization, we find that $f_ξ$ is nearly independent of temperature as long as $Δγ\lesssim 10^{-1.5}$ (with only a modest decrease of a factor of three from $Δγ=10^{-5}$ to $Δγ=10^{-1.5}$), but it drops by nearly two orders of magnitude for $Δγ\gtrsim 10^{-1}$. At fixed temperature, the scaling with magnetization $f_ξ\sim 10^{-3}\,σ^{-1}$ is consistent with our earlier one-dimensional results. For our reference $σ=1$, the power spectrum of precursor waves is relatively broad (fractional width $\sim 1-3$) for cold temperatures, whereas it shows pronounced line-like features with fractional width $\sim 0.2$ for $10^{-3} \lesssim Δγ\lesssim 10^{-1.5} $. For $σ\gtrsim 1$, the precursor waves are beamed within an angle $\simeq σ^{-1/2}$ from the shock normal (as measured in the post-shock frame), as required so they can outrun the shock. Our results can provide physically-grounded inputs for FRB emission models based on maser emission from relativistic shocks.
description: 12 pages, 15 figures, submitted to MNRAS
Anisotropy of the upper critical field in MgB2: the two-gap Ginzburg-Landau theory
Creators: name: Dao, V. H.
name: Zhitomirsky, M. E.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: The upper critical field in MgB2 is investigated in the framework of the two-gap Ginzburg-Landau theory. A variational solution of linearized Ginzburg-Landau equations agrees well with the Landau level expansion and demonstrates that spatial distributions of the gap functions are different in the two bands and change with temperature. The temperature variation of the ratio of two gaps is responsible for the upward temperature dependence of in-plane Hc2 as well as for the deviation of its out-of-plane behavior from the standard angular dependence. The hexagonal in-plane modulations of Hc2 can change sign with decreasing temperature.
description: 6 pages, 6 figures, accepted in the European Physical Journal B
SYMPOSIUM--CONTEMPORARY AGRICULTURAL ECONOMICS IN AUSTRALIA
Creators: name: Campbell, Keith O.
name: Campbell, Keith O.
Publisher: name: Unknown
Year: 1957
Subjects: Teaching/Communication/Extension/Profession

description: It seems to me that there are three major aspects of agricultural economics research which we might fruitfully examine in this symposium: (i) the nature of the research which has been and should be undertaken; (ii) the organisation required for effective research; and ( iii) the financing of such research.