cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Shortened Array Codes of Large Girth
Creators: name: Milenkovic, Olgica
name: Kashyap, Navin
name: Leyba, David
Publisher: name: arXiv
Year: 2005
Subjects: subject: Discrete Mathematics (cs.DM)
subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: One approach to designing structured low-density parity-check (LDPC) codes with large girth is to shorten codes with small girth in such a manner that the deleted columns of the parity-check matrix contain all the variables involved in short cycles. This approach is especially effective if the parity-check matrix of a code is a matrix composed of blocks of circulant permutation matrices, as is the case for the class of codes known as array codes. We show how to shorten array codes by deleting certain columns of their parity-check matrices so as to increase their girth. The shortening approach is based on the observation that for array codes, and in fact for a slightly more general class of LDPC codes, the cycles in the corresponding Tanner graph are governed by certain homogeneous linear equations with integer coefficients. Consequently, we can selectively eliminate cycles from an array code by only retaining those columns from the parity-check matrix of the original code that are indexed by integer sequences that do not contain solutions to the equations governing those cycles. We provide Ramsey-theoretic estimates for the maximum number of columns that can be retained from the original parity-check matrix with the property that the sequence of their indices avoid solutions to various types of cycle-governing equations. This translates to estimates of the rate penalty incurred in shortening a code to eliminate cycles. Simulation results show that for the codes considered, shortening them to increase the girth can lead to significant gains in signal-to-noise ratio in the case of communication over an additive white Gaussian noise channel.
description: 16 pages; 8 figures; to appear in IEEE Transactions on Information Theory, Aug 2006
TAX-DEFERRED RISK MANAGEMENT ACCOUNTS FOR FARMERS
Creators: name: Monke, James D.
name: Monke, James D.
Publisher: name: Unknown
Year: 1997
Subjects: subject: Risk and Uncertainty
subject: risk management
subject: taxes
subject: farm income
subject: government programs

description: Income tax incentives directly affect the economic feasibility of proposals for tax-deferred risk management accounts. Data indicate that despite clear financial advantages from tax deferment and reduced income variability, income targeting may preclude many farmers from contributing enough money for accounts to be effective.
Evaluating the impact of yoga on perceived stress levels of cancer patients and cancer survivors
Creators: name: Diaz, Waleska
Publisher: name: No Publisher Supplied
Year: 2021

description: Purpose: The purpose of this study was to evaluate if the perceived stress levels of cancer patients and cancer survivors could be reduced through the regular practice of structured, professionally led, yoga sessions. Methods: This study was quasi-experimental design that included pre- and post-intervention measurement of Perceived stress scale (PSS) surveys. The PSS-10, a 10 question Likert type questionnaire can be used to assess self-reported stress levels. Totals range from 0 to 40 with higher scores reflective of higher stress levels: Low 0-13, Moderate 14-26 and High 27 or greater. Intervention included a once weekly, 60-minute restorative gentle flow instructor led yoga session over a one-month period.Results: A convenience sample of 18 English speaking adults, ages 18-89 with a current diagnosis or history of cancer were recruited for this study. Attrition rate was 25% leaving a final sample of (n=14). The Mean (M) and standard deviation (SD) for the pre intervention PSS were (M=20.36, 6.48 SD) and (M=15.07, SD 4.87) for post. A paired sample t test was used to evaluate the difference in scores. The results were as follows: pre-PSS (M=20.35, SD=6.47) and post PSS (M=15.07 SD=4.87) p = .005 with a significance level (p=value) set to .05. Conclusion: The study yielded statistically significant results suggesting that the practice of yoga may be used as an effective method of stress reduction in this particular sample.
26. Polar motion
Creators: name: Perryman, Michael
Publisher: name: Zenodo
Year: 2021

description: The Earth's rotation axis moves, on timescales ranging from years to millennia, as a result of various external and internal forces. The wobbling motion of the Earth has been characterised, back to about 1900, by re-examining star measurements using the Hipparcos star positions. Further insight could be possible with Gaia.
The sixth Painleve equation arising from D_4^{(1)} hierarchy
Creators: name: Fuji, Kenta
name: Suzuki, Takao
Publisher: name: arXiv
Year: 2006
Subjects: subject: Mathematical Physics (math-ph)
subject: Representation Theory (math.RT)
subject: FOS: Physical sciences
subject: FOS: Mathematics
subject: 34M55, 17B80, 37K10

description: The sixth Painleve equation arises from a Drinfel'd-Sokolov hierarchy associated with the affine Lie algebra of type D_4 by similarity reduction.
description: 14 pages
Dynamics of nanoparticle self-assembly by liquid crystal sorting
Creators: name: F. Gael Segura Fernández
name: García, Erick F. Serrato
name: Calderón, José Emanuel Flores
name: Guzman, Orlando
Publisher: name: figshare
Year: 2020
Subjects: subject: 20405 Soft Condensed Matter
subject: FOS: Physical sciences

description: This repository contains the data of numerical simulations of the rapid segregation of nanoparticles away from nematic domains. In our model we propose dynamical equations for the coupled conserved and non-conserved fields describing the nanoparticle (NP) concentration and liquid crystal (LC) order parameter, respectively, and solve them numerically. We contrast the different behaviors obtained when the LC order parameter is treated as a scalar or a tensor, as well as the different rates of evolution observed with each of these.
RACIAL DISCRIMINATION IN HIRE/PURCHASE LENDING IN APARTHEID SOUTH AFRICA
Creators: name: Schreiner, Mark
name: Graham, Douglas H.
name: Cortes-Fontcuberta, Manuel
name: Coetzee, Gerhard K.
name: Vink, Nick
name: Schreiner, Mark
name: Graham, Douglas H.
name: Cortes-Fontcuberta, Manuel
name: Coetzee, Gerhard K.
name: Vink, Nick
Publisher: name: Unknown
Year: 1997
Subjects: subject: Financial Economics
subject: Consumer finance
subject: disequilibrium models
subject: racial discrimination
subject: truncated and censored models
subject: South Africa

description: A partial-observability model finds evidence of racial discrimination by retailers of consumer durables in apartheid South Africa. In particular, black households are 13 percentage points more likely to demand a hire/purchase loan but not to have one supplied than are other households, all else equal.
On the role of solute drag in reconciling laboratory and natural constraints on olivine grain growth kinetics
Creators: name: Furstoss, Jean
name: Petit, Carole
name: Tommasi, Andrea
name: Ganino, Clément
name: Muñoz, Daniel Pino
name: Bernacki, Marc
Publisher: name: arXiv
Year: 2020
Subjects: subject: Geophysics (physics.geo-ph)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Computational Engineering, Finance, and Science (cs.CE)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: We investigate the effect of solute drag on grain growth (GG) kinetics in olivine-rich rocks through full field and mean field modelling. Considering a drag force exerted by impurities on grain boundary migration allows reconciling laboratory and natural constraints on olivine GG kinetics. Solute drag is implemented in a full field level-set framework and on a mean field model, which explicitly accounts for a grain size distribution. After calibration of the mean field model on full field results, both models are able to both reproduce laboratory GG kinetics and to predict grain sizes consistent with observations in peridotite xenoliths from different geological contexts.
UNCERTAINTY AND THE REGULATION OF NITRATE POLLUTION FROM AGRICULTURE
Creators: name: Abrahams, Nii Adote
name: Shortle, James S.
name: Abrahams, Nii Adote
name: Shortle, James S.
Publisher: name: Unknown
Year: 1997
Subjects: subject: Environmental Economics and Policy
subject: environmental policy
subject: nonpoint pollution
subject: uncertainty
subject: value of information

description: A simulation of U.S. corn production compares four environmental policies for controlling agricultural nitrate pollution. Public uncertainty about key economic parameters are considered. Results indicate that policy choice is sensitive to commodity programs and the public information structure. Agricultural research benefits are also sensitive to agricultural environmental policy choices.
27. The celestial reference frame
Creators: name: Perryman, Michael
Publisher: name: Zenodo
Year: 2021

description: An absolute reference system is as central to Gaia as it was for Hipparcos, and the accuracy for the link correspondingly more demanding. But Gaia's limiting magnitude, at 20–21 mag, allows very large numbers of quasars to be observed by the instrument itself.  And this means that the problem can be tackled much more directly.
HISTORY OF CONSTRUCTION OF RESERVOIRS WITHIN THE FRAMEWORK OF AGRICULTURAL POLICY OF THE SOVIET STATE IN THE KASHKADARYA OASIS
Creators: name: Jabbarova, Ikbal
name: Qodirov, Islom
Publisher: name: Zenodo
Year: 2024

description: The article reveals the history of the construction of the water reservoir during the years of Soviet power in the Kashkadarya oasis, as well as the development of new lands and the history of the irrigation system, based on archival and primary sources. The scope, results and consequences of the work done during the construction of water reservoirs are covered with historical evidence.
Peanut Snack and Peanut Spread: Potential New Products
Creators: name: Gilliland, C. B.
name: Smith, Thomas B.
name: Gilliland, C. B.
name: Smith, Thomas B.
Publisher: name: Unknown
Year: 1952
Subjects: subject: Food Consumption/Nutrition/Food Safety
subject: Marketing
subject: FOS: Economics and business
subject: Research Methods/ Statistical Methods

description: Excerpt from the report Summary: "Peanut Snack" and "Peanut Spread" -- two new Products -- have been successfully developed and marketed experimentally. Peanut Snack, in several flavors, is a sliceable product packaged in an 8-ounce roll. Peanut Spread is a flavored and spreadable product, packaged in an 8-ounce glass jar. The Georgia Agricultural Experiment Station had previously produced these or very similar products in its laboratory. But it was not until 1951 that marketing and acceptability tests were made after the products had been produced in a commercial plant. Comparative tests in the marketing of these new forms of peanut products were carried out in retail stores in the State of Georgia. Results of the limited experiment showed that consumers to whom the products were given indicated an appreciation of the opportunity to choose products of different flavor, consistency, and packaging in addition to the usual peanut butter. Furthermore, the results showed that the new products could be produced at approximately the same cost as peanut butter.
Surprises in the phase diagram of an Anderson impurity model for a single C$_{60}^{n-}$ molecule
Creators: name: De Leo, L.
name: Fabrizio, M.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We find by Wilson numerical renormalization group and conformal field theory that a three-orbital Anderson impurity model for a C$_{60}^{n-}$ molecule has a very rich phase diagram which includes non-Fermi-liquid stable and unstable fixed points with interesting properties, most notably high sensitivity to doping $n$. We discuss the implications of our results to the conductance behavior of C$_{60}$-based single-molecule transistor devices.
description: 4 pages, 3 figures, 2 tables. Accepted version
Synthesis and characterization of template-assembled three- and four- helix bundle proteins
Creators: name: Causton, Ashley Scott
Publisher: name: University of British Columbia
Year: 2009

description: The unique three-dimensional structure of a protein is the result of a multitude of non-covalent interactions within the polypeptide backbone, and between the side chains of its constituent amino acids. One method that can be used to simplify and study the noncovalent forces present in protein structure is to use a template assembled synthetic protein (TASP): This method employs peptide strands that are attached to a template which directs them to fold into a pre-determined folding pattern. [Diagram of Three-Helix Bundle TASP] [Diagram of Four-Helix Bundle TASP] This thesis studies three- and four-helix bundles using the TASP concept. The templates are cyclotribenzylene ("CTB") and cavitand bowl ("bowl") macrocycles, which have three- and four-fold symmetry, respectively. Amphiphilic peptides (for example, CEELLKKLEELLKKG) which were designed to form helical bundles, were attached to the templates via disulfide bonds. The CTB and bowl TASPs were synthesized by first activating the side chain of a cysteine residue in the peptide strand, and then reacting it with a benzyl thiol moiety on the template. TASPs containing various peptide sequences were investigated in terms of their structure and stability. The CTB and bowl TASPs were found to have helical structure, and enhanced stability to chemical denaturation, exhibiting the co-operative unfolding that is a characteristic of natural proteins. The initial CTB and bowl TASPs contained peptides with the template-bound cysteine residue adjacent to the "helix" sequence, and were found to undergo self-association. This was attributed to incorrect bundling of the constituent helices, resulting from a template-to-helix linker that was too short. Therefore, flexible glycine residues were introduced between the template-bound cysteine residue and the helix in the attached polypeptides. A three-glycine "spacer" (i.e. CGGGEELLKKLEELLKKG) was found to be optimal for reducing TASP self-association. The ultimate goal of this research is to produce TASPs with "native-like" conformational specificity. This first generation of CTB and bowl TASPs appeared to have molten globule structure, which is consistent with other de novo designed proteins that contained a degenerate series of amino acids in their core; this is a good starting point for future designs. By varying the size and shape of the central residue in the TASP's helices, some difference in their stability was observed. These studies demonstrated the validity of these TASP models for investigating protein structure.
THE TRADE RESTRICTIVENESS INDEX: THE POTENTIAL CONTRIBUTION TO AGRICULTURAL POLICY ANALYSIS
Creators: name: Salvatici, Luca
name: Carter, Colin A.
name: Sumner, Daniel A.
name: Salvatici, Luca
name: Carter, Colin A.
name: Sumner, Daniel A.
Publisher: name: Unknown
Year: 1997
Subjects: Agricultural and Food Policy
International Relations/Trade

description: In the policy arena, there is a demand for "trade distortion indicators", but many of the traditional indices are difficult to compute and interpret. Recent developments in the literature have led to a new indicator: the Trade Restrictiveness Index (TRI). This paper analyzes some problems related to the TRI's computation and interpretation. We argue that the index is theoretically well grounded and offers potential for measuring the relative importance of agricultural policy distortions. However, the name of "trade restrictiveness" index is seriously misleading, since the TRI does not provide a measure of trade flows restrictions.
Switching between memories in neural automata with synaptic noise
Creators: name: Cortes, J. M.
name: Garrido, P. L.
name: Marro, J.
name: Torres, J. J.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: We present a stochastic neural automata in which activity fluctuations and synaptic intensities evolve at different temperature, the latter moving through a set of stored patterns. The network thus exhibits various retrieval phases, including one which depicts continuous switching between attractors. The switching may be either random or more complex, depending on the system parameters values.
description: 4 pages, 3 figures
Jointly Modeling Intra- and Inter-transaction Dependencies with Hierarchical Attentive Transaction Embeddings for Next-item Recommendation
Creators: name: Wang, Shoujin
name: Cao, Longbing
name: Hu, Liang
name: Berkovsky, Shlomo
name: Huang, Xiaoshui
name: Xiao, Lin
name: Lu, Wenpeng
Publisher: name: arXiv
Year: 2020
Subjects: subject: Information Retrieval (cs.IR)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: A transaction-based recommender system (TBRS) aims to predict the next item by modeling dependencies in transactional data. Generally, two kinds of dependencies considered are intra-transaction dependency and inter-transaction dependency. Most existing TBRSs recommend next item by only modeling the intra-transaction dependency within the current transaction while ignoring inter-transaction dependency with recent transactions that may also affect the next item. However, as not all recent transactions are relevant to the current and next items, the relevant ones should be identified and prioritized. In this paper, we propose a novel hierarchical attentive transaction embedding (HATE) model to tackle these issues. Specifically, a two-level attention mechanism integrates both item embedding and transaction embedding to build an attentive context representation that incorporates both intraand inter-transaction dependencies. With the learned context representation, HATE then recommends the next item. Experimental evaluations on two real-world transaction datasets show that HATE significantly outperforms the state-ofthe-art methods in terms of recommendation accuracy.
description: Accepted by IEEE Intelligent Systems
Collinear-to-Spiral Spin Transformation without Changing Modulation Wavelength upon Ferroelectric Transition in Tb1-xDyxMnO3
Creators: name: Arima, T.
name: Tokunaga, A.
name: Goto, T.
name: Kimura, H.
name: Noda, Y.
name: Tokura, Y.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Lattice modulation and magnetic structures in magnetoelectric compounds Tb1-xDyxMnO3 have been studied around the ferroelectric (FE) Curie temperature T_C by x-ray and neutron diffraction. Temperature-independent modulation vectors through T_C are observed for the compounds with 0.50< x < 0.68. This indicates that ferroelectricity with a polarization (P) along the c axis in the RMnO3 series cannot be ascribed to such an incommensurate-commensurate transition of an antiferromagnetic order as was previously anticipated. Neutron diffraction study of a single crystal with x=0.59 shows that the FE transition is accompanied by the transformation of the Mn-spin alignment from sinusoidal (collinear) antiferromagnetism into a transverse spiral structure. The observed spiral structure below T_C is expected to produce P along the c axis with the `inverse' Dzialoshinski-Moriya interaction, which is consistent with the observation.
description: 9 pages, 4 figures
Impact of Subsidies Across Alabama Counties: An Econometric Interpretation
Creators: name: Yeboah, Osei-Agyeman
name: Thompson, Henry
name: Yeboah, Osei-Agyeman
name: Thompson, Henry
Publisher: name: Unknown
Year: 2003
Subjects: Agricultural and Food Policy

description: Fixed effect time series effect models are used to analyze the spatial and time series pattern of the effects of subsidies on manufacturing income across twenty counties in Alabama from 1970 to 1999. The results from the fixed effect model indicate that median populated counties performed better than larger and smaller counties while the time series effect model indicates that the impact of subsidies is marginal across the state over time.
On the fate of black string instabilities: An Observation
Creators: name: Marolf, Donald
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Gregory and Laflamme (hep-th/9301052) have argued that an instability causes the Schwarzschild black string to break up into disjoint black holes. On the other hand, Horowitz and Maeda (arXiv:hep-th/0105111) derived bounds on the rate at which the smallest sphere can pinch off, showing that, if it happens at all, such a pinch-off can occur only at infinite affine parameter along the horizon. An interesting point is that, if a singularity forms, such an infinite affine parameter may correspond to a finite advanced time -- which is in fact a more appropriate notion of time at infinity. We argue below that pinch-off at a finite advanced time is in fact a natural expectation under the bounds derived by Horowitz and Maeda.
description: 4 pages, RevTex, 1 figure, references added
USING CONTINGENT VALUATION WITH RESPONDENT UNCERTAINTY TO ESTIMATE THE COSTS OF CLIMATE CHANGE PROGRAMS: AN APPLICATION TO CANADIAN LANDOWNERS
Creators: name: Shaikh, Sabina L.
name: Van Kooten, G. Cornelis
name: Shaikh, Sabina L.
name: Van Kooten, G. Cornelis
Publisher: name: Unknown
Year: 2003
Subjects: Environmental Economics and Policy
Resource /Energy Economics and Policy

description: Using a survey of western Canadian agricultural landowners, we examine the cost and viability of two distinct afforestation options for carbon-uptake purposes. Responses to two separate, but most-likely related willingness to accept compensation questions are elicited using the contingent valuation method. Respondents then select the level of certainty with which they believe their responses were given. This paper provides a framework for estimation of the bivariate model with certainty and a modification of the model to incorporate uncertainty based on Li and Mattson's approach to preference uncertainty. While highly preliminary results are given for the bivariate model with certainty, applications of both models will be presented at the 2003 AAEA Meetings.
A standardized process to eliminate sternal wound infections in adult cardiac surgery patients: a program evaluation
Creators: name: Fonseca, Maria Alcina
Publisher: name: No Publisher Supplied
Year: 2021

description: Purpose of the project: The purpose of this study was to conduct a comprehensive program evaluation of a quality improvement program (QI) implemented in 2018 to eliminate sternal wound infections (SWI). Methodology: The program evaluation utilized the Stufflebeam (1983) model which consists of context, input, process, product (CIPP) as the theoretical framework. The participants comprised of nurses who work in the post-cardiac surgery telemetry unit. The study design consisted of a web-based anonymous survey with a five Likert-type scale questionnaire, open-ended question, and drag-and-drop exercise for the order of the steps to complete the incision care. The goal was to assess the knowledge and attitudes of nurses with adherence to the sternal incision care bundle. Results: Findings indicated that the bundle’s elements comply with the Centers for Disease Control and Prevention (CDC) guidelines. Gaps and barriers identified with variability with incision care, lack of knowledge with CDC guidelines, and hand hygiene monitoring. Moreover, nurses reported the bundle is easy to follow and is time-saving. Importantly, the study’s site has seen a steady decrease in (SWIs) since the bundle was implemented and achieved a zero-infection rate, that was sustained for 13 months. Implications for Practice: Implications for practice will focus on standardizing the clinical processes to include bundles that incorporate guidelines by the CDC to achieve a zero-infection rate. Revise the cardiac surgery postoperative incision care protocol and re-educate the clinical nurses and new orientees.
Teinonen, Seppo A., Missio Politica Oecumenica
Creators: name: Scheuner, Ulrich
Publisher: name: Ökumenische Rundschau
Year: 2025

description: Ökumenische Rundschau, Bd. 11 Nr. 3 (1962): Ökumenische Rundschau, Band 11, Heft 3
NBC News/Associated Press Poll: Massachusetts Election Day Voter Poll
Creators: name: Associated Press
name: NBC News
Publisher: name: Roper Center for Public Opinion Research
Year: 2021

description: Ted Kennedy running for president (1); military spending (1); trade restrictions on Japanese cars (1); House of Representative candidate voted for (1); Ronald Reagan job performance (1); Reagan handling economy (3); nuclear weapons production freeze (2); reducing nuclear weapons (1); Democratic presidential nominee (1); troops sent to Lebanon (1); inflation vs. unemployment (2); better political party to handle economy (1); Reagan reelection (1); Reagan economic program fairness (1); 1980 presidential election (1); military aid to Israel (1).
Origins of fractality in the growth of complex networks
Creators: name: Song, Chaoming
name: Havlin, Shlomo
name: Makse, Hernán A.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: Complex networks from such different fields as biology, technology or sociology share similar organization principles. The possibility of a unique growth mechanism promises to uncover universal origins of collective behaviour. In particular, the emergence of self-similarity in complex networks raises the fundamental question of the growth process according to which these structures evolve. Here we investigate the concept of renormalization as a mechanism for the growth of fractal and non-fractal modular networks. We show that the key principle that gives rise to the fractal architecture of networks is a strong effective 'repulsion' (or, disassortativity) between the most connected nodes (that is, the hubs) on all length scales, rendering them very dispersed. More importantly, we show that a robust network comprising functional modules, such as a cellular network, necessitates a fractal topology, suggestive of an evolutionary drive for their existence.
Assessing nurse practitioner readiness for telemedicine through e-learning
Creators: name: LaFortune, Edwidge
Publisher: name: No Publisher Supplied
Year: 2021

description: Purpose of Project: The purpose of this project was to determine if educating students and practicing NP’s about telemedicine through an online continuing education module would result in an increase in knowledge, attitude and confidence. Methodology: The purpose of this project was achieved by educating students and practicing NP’s through an online telemedicine educational module on CANVAS. Participants knowledge, attitudes, and confidence were measured by using TeleOSCE survey pre and post-educational module. Knowledge retention of telemedicine practice was also measured with pre-/post-test.Results: Participants found telemedicine training beneficial, which was reflected by increases in their knowledge, attitude, and confidence. Implications for practice: Telemedicine training helps with current gaps in clinical education by improving NP learners' knowledge and confidence with telemedicine.
28. Solar activity - and dark matter?
Creators: name: Perryman, Michael
Publisher: name: Zenodo
Year: 2021

description: The rotation of the Sun is central to the two main hypotheses which try to explain the 11-year solar activity cycle: attributable either to a turbulent dynamo operating in or below the Sun's convection envelope, or to a large-scale oscillations of a fossil magnetic field in its radiative core. Some particularly speculative ideas could be tested with Gaia.
Minimal Lagrangian surfaces in $S^2 \times S^2$
Creators: name: Castro, Ildefonso
name: Urbano, Francisco
Publisher: name: arXiv
Year: 2006
Subjects: subject: Differential Geometry (math.DG)
subject: FOS: Mathematics
subject: 53C42, 53B25

description: We deal with the minimal Lagrangian surfaces of the Einstein-Kähler surface $S^2 \times S^2$, studying local geometric properties and showing that they can be locally described as Gauss maps of minimal surfaces in $S^3 \subset R^4$. We also discuss the second variation of the area and characterize the most relevant examples by their stability behaviour.
description: 22 pages
A DISCRETE SPACE URBAN MODEL WITH ENVIRONMENTAL AMENITIES
Creators: name: Tajibaeva, Liaila
name: Haight, Robert G.
name: Polasky, Stephen
name: Tajibaeva, Liaila
name: Haight, Robert G.
name: Polasky, Stephen
Publisher: name: Unknown
Year: 2003
Subjects: Environmental Economics and Policy

description: This paper analyzes the effects of providing environmental amenities associated with open space in a discrete space urban model. The discrete space model assumes distinct neighborhoods in which developable land is homogeneous within a neighborhood but heterogeneous across neighborhoods. We solve for equilibrium allocation of development, prices and welfare given a pattern of open space provision. We also analyze the optimal provision of open space across neighborhoods. In equilibrium, housing density and price in a neighborhood is increasing in the amount of open space provided in that neighborhood. Whether housing density and prices in other neighborhoods increases or decreases depends on whether the push from reduced availability of developable land in the neighborhood with increased open space, or the pull of the local amenity value in that neighborhood, is stronger.
A Radio Transient 0.1 pc from Sagittarius A*
Creators: name: Bower, Geoffrey C.
name: Roberts, Doug A.
name: Yusef-Zadeh, Farhad
name: Backer, Donald C.
name: Cotton, W. D.
name: Goss, W. M.
name: Lang, Cornelia C.
name: Lithwick, Yoram
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We report the discovery of a transient radio source 2.7 arcsec (0.1 pc projected distance) South of the Galactic Center massive black hole, Sagittarius A*. The source flared with a peak of at least 80 mJy in March 2004. The source was resolved by the Very Large Array into two components with a separation of ~0.7 arcsec and characteristic sizes of ~0.2 arcsec. The two components of the source faded with a power-law index of 1.1 +/- 0.1. We detect an upper limit to the proper motion of the Eastern component of ~3 x 10^3 km s^-1 relative to Sgr A*. We detect a proper motion of ~10^4 km s^-1 for the Western component relative to Sgr A*. The transient was also detected at X-ray wavelengths with the Chandra X-ray Observatory and the XMM-Newton telescope and given the designation CXOGC J174540.0-290031. The X-ray source falls in between the two radio components. The maximum luminosity of the X-ray source is ~10^36 erg s^-1, significantly sub-Eddington. The radio jet flux density predicted by the X-ray/radio correlation for X-ray binaries is orders of magnitude less than the measured flux density. We conclude that the radio transient is the result of a bipolar jet originating in a single impulsive event from the X-ray source and interacting with the dense interstellar medium of the Galactic Center.
description: accepted in ApJ; 24 pages; 8 figures
No evidence for interstellar planetesimals trapped in the Solar System
Creators: name: Morbidelli, A.
name: Batygin, K.
name: Brasser, R.
name: Raymond, S.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: In two recent papers published in MNRAS, Namouni and Morais (2018, 2020) claimed evidence for the interstellar origin of some small Solar System bodies, including i) objects in retrograde co-orbital motion with the giant planets, and ii) the highly-inclined Centaurs. Here, we discuss the flaws of those papers that invalidate the authors' conclusions. Numerical simulations backwards in time are not representative of the past evolution of real bodies. Instead, these simulations are only useful as a means to quantify the short dynamical lifetime of the considered bodies and the fast decay of their population. In light of this fast decay, if the observed bodies were the survivors of populations of objects captured from interstellar space in the early Solar System, these populations should have been implausibly large (e.g. about 10 times the current main asteroid belt population for the retrograde coorbital of Jupiter). More likely, the observed objects are just transient members of a population that is maintained in quasi-steady state by a continuous flux of objects from some parent reservoir in the distant Solar System. We identify in the Halley type comets and the Oort cloud the most likely sources of retrograde coorbitals and highly-inclined Centaurs.
description: in press in MNRAS
EXCHANGE RATE PASS-THROUGH AND ITS RELATION TO MARKET POWER: REINTERPRETATION OF THE DEGREE OF EXCHANGE RATE PASS-THROUGH
Creators: name: Kim, MinKyoung
name: Cho, Guedae
name: Koo, Won W.
name: Kim, MinKyoung
name: Cho, Guedae
name: Koo, Won W.
Publisher: name: Unknown
Year: 2003
Subjects: Agribusiness

description: We propose a different perspective for interpretation of exchange rate pass-through: a relatively lower (higher) degree of pass-through implies a competitive (less competitive) market. Using three different wheat exporting countries, the United States, Canada, and Australia, and two importing countries, Japan and Korea, we are not likely to reject our hypothesis. In the competitive market (Japan), the exporting countries determine their prices based on changes in the competing country's price, and as a result, there is a close-to-zero degree of exchange rate pass-through. However, a lower degree of price competition and a significantly higher degree of exchange rate pass-through are found in a less competitive market (Korea).
EVALUATING FACTORS INFLUENCING GROCERY STORE CHOICE
Creators: name: Palma, Marco A.
name: Emerson, Robert D.
name: House, Lisa
name: Palma, Marco A.
name: Emerson, Robert D.
name: House, Lisa
Publisher: name: Unknown
Year: 2003
Subjects: Consumer/Household Economics
Institutional and Behavioral Economics

description: This paper analyzes consumer preferences toward grocery store choices given a set of attributes of stores. This information will then be used to make inferences on how the opening of a Wal-Mart supercenter would affect the other grocery stores in a small city.
HETEROGENEITY IN THE HINTERLAND: A TYPOLOGICAL ANALYSIS OF OHIO EXURBAN AREAS
Creators: name: Irwin, Elena G.
name: Sharp, Jeff
name: Irwin, Elena G.
name: Sharp, Jeff
Publisher: name: Unknown
Year: 2003
Subjects: Community/Rural/Urban Development

description: Located between suburban and rural regions, exurban areas are among the fastest growing regions in the U.S. To better understand exurban changes and their policy implications, we develop a typology of rural-urban places and use statistical methods to examine township patterns of exurban change in Ohio.
Systematic pathway generation and sorting in martensitic transformations: Titanium alpha to omega
Creators: name: Trinkle, D. R.
name: Hatch, D. M.
name: Stokes, H. T.
name: Hennig, R. G.
name: Albers, R. C.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Structural phase transitions are governed by the underlying atomic transformation mechanism; martensitic transformations can be separated into strain and shuffle components. A systematic pathway generation and sorting algorithm is presented and applied to the problem of the titanium alpha to omega transformation under pressure. In this algorithm, all pathways are constructed within a few geometric limits, and efficiently sorted by their energy barriers. The geometry and symmetry details of the seven lowest energy barrier pathways are given. The lack of a single simple geometric criterion for determining the lowest energy pathway shows the necessity of atomistic studies for pathway determination.
description: 11 pages, 2 figures
ENVIRONMENTAL REGULATION WITH INNOVATION AND LEARNING: RULES VERSUS DISCRETION
Creators: name: Tarui, Nori
name: Polasky, Stephen
name: Tarui, Nori
name: Polasky, Stephen
Publisher: name: Unknown
Year: 2003
Subjects: Environmental Economics and Policy

description: We analyze a model of environmental regulation with learning about environmental damages and endogenous choice of emissions abatement technology by a polluting firm. We compare environmental policy under discretion, in which policy is updated upon learning new information, versus under rules, in which policy is not updated. When investment in abatement technology is made prior to the resolution of uncertainty, neither discretion nor rules with either taxes or standards achieve an efficient solution. When there is little uncertainty, rules are superior to discretion because discretionary policy gives the firm an incentive to distort investment in order to influence future regulation. However, when uncertainty is large, discretion is superior to rules because it allows regulation to incorporate new information. Under discretionary policy, taxes are superior to standards regardless of the relative slopes of marginal costs and marginal damages.
Upper bounds for edge-antipodal and subequilateral polytopes
Creators: name: Swanepoel, Konrad J
Publisher: name: arXiv
Year: 2006
Subjects: subject: Metric Geometry (math.MG)
subject: FOS: Mathematics
subject: 52B12; 52B05

description: A polytope in a finite-dimensional normed space is subequilateral if the length in the norm of each of its edges equals its diameter. Subequilateral polytopes occur in the study of two unrelated subjects: surface energy minimizing cones and edge-antipodal polytopes. We show that the number of vertices of a subequilateral polytope in any d-dimensional normed space is bounded above by (d/2+1)^d for any d >= 2. The same upper bound then follows for the number of vertices of the edge-antipodal polytopes introduced by I.Talata (Period. Math. Hungar. 38 (1999), 231--246). This is a constructive improvement to the result of A.Pór (to appear) that for each dimension d there exists an upper bound f(d) for the number of vertices of an edge-antipodal d-polytopes. We also show that in d-dimensional Euclidean space the only subequilateral polytopes are equilateral simplices.
description: 7 pages
Comment on Esbensen, Bertsch and Snover Concerning Reconciling Coulomb Dissociation and Radiative Capture Measurements
Creators: name: Gai, Moshe
Publisher: name: arXiv
Year: 2005
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: The RIKEN data on the Coulomb Dissociation (CD) of 8B were shown to be in good agreement with the Direct Capture (DC) data on the 7Be(p,g)8B reaction (that were known at that time) of Filippone {\em et al.} Yet recently it was claimed that the RIKEN2 CD data must be corrected in order to be reconciled with the slope of DC data. Considering the (correct) so called scale independent b-slope parameter of the RIKEN2 CD data, the resultant corrected b-slope parameter suggested by Esbensen, Bertsch and Snover is shown to be considerably smaller than the so called average b-slope parameter of DC data. The suggested corrections of the b-slope parameter lead to a large disagreement with DC data, in sharp contrast to the claim. The slope corrections are only significant for the RIKEN2 CD data. For the GSI kinematics, where in fact one may observe slope different than for DC (at least for the GSI1 data), they find a fortuitous cancellation that leads to a vanishingly small slope correction. Hence the validity of these correction based on the observed slopes can not be substantiated.
description: Work Supported by USDOE Grant No. DE-FG02-94ER40870. Updated as published in the Phys. Rev. Lett. on April 21, 2006
Experimental analysis of the spin-orbit coupling dependence on the drift velocity of a spin packet
Creators: name: Kawahala, N. M .
name: Moraes, F. C. D.
name: Gusev, G. M.
name: Bakarov, A. K.
name: Hernandez, F. G. G.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Spin transport was studied in a two-dimensional electron gas hosted in a wide GaAs quantum well occupying two subbands. Using space and time Kerr rotation microscopy to image drifting spin packets under an in-plane accelerating electric field, optical injection and detection of spin polarization were achieved in a pump-probe configuration. The experimental data exhibited high spin mobility and long spin lifetimes allowing to obtain the spin-orbit fields as a function of the spin velocities. Surprisingly, above moderate electric fields of 0.4V/cm with velocities higher than 2$μ$m/ns, we observed a dependence of both bulk and structure-related spin-orbit interactions on the velocity magnitude. A remarkable feature is the increase of the cubic Dresselhaus term to approximately half of the linear coupling when the velocity is raised to 10$μ$m/ns. In contrast, the Rashba coupling for both subbands decreases to about half of its value in the same range. These results yield new information for the application of drift models in spin-orbit fields and about limitations for the operation of spin transistors.
description: 5 pages, 3 figures
THE ROLE OF SPATIAL AND DEMOGRAPHIC CHARACTERISTICS IN DIRECT FARM MARKETING: AN ECONOMETRIC APPROACH
Creators: name: Gandee, Jesse E.
name: Brown, Cheryl
name: D'Souza, Gerard E.
name: Gandee, Jesse E.
name: Brown, Cheryl
name: D'Souza, Gerard E.
Publisher: name: Unknown
Year: 2003
Subjects: subject: Marketing
subject: FOS: Economics and business

description: Direct farm marketing sales in the Northeastern region of the U.S. and more specifically in the state of West Virginia increased during the 1990s. To understand the factors that influence recent trends in direct farm marketing, this analysis uses a regression function to test the relationships between county direct farm marketing sales and county spatial and socio-economic characteristics. Data from West Virginia is used to analyze the relationship between the consumer, land characteristics, and farm sales. The results reveal that the model is relatively accurate and multiple consumer characteristics and land use variables significantly influence sales of farm goods marketed directly to consumers.
Carbon sequestration in agricultural soils: A dynamic assessment
Creators: name: De Cara, Stephane
name: Rozakis, Stelios
name: De Cara, Stephane
name: Rozakis, Stelios
Publisher: name: Unknown
Year: 2003
Subjects: Environmental Economics and Policy

description: We examine the spatial and dynamic implications of policies aimed at encouraging carbon sequestration in agricultural soils. We consider incentive mechanisms to encourage the planting of energy multi-annual crops that allow higher carbon sequestration rates for a longer period of time. By using a dynamic micro-economic model, we simulate the sequence of crop plantings over a given time horizon and investigate different payment mechanisms (per-ton or per-hectare). We discuss their implications in terms of regulation policy and efficiency. This model is then applied to the Central Plains of Thessaly, Greece to assess the marginal costs of carbon sequestration and the optimal timing of switching to multi-annual energy crops. To do so, we couple the dynamic microeconomic model with a carbon accounting model and a geophysical database. We provide an assessment of the potential loss of efficiency related to the use of constant per-hectare payments. We also discuss the dynamic implications of these mechanisms, as well as their results in terms of spatial distribution.
A NOTE ON LIVESTOCK BREEDING POLICIES IN STABLE AND DEVELOPMENT SITUATIONS
Creators: name: Byrne, P.F.
name: Healy, A.T.A.
name: Byrne, P.F.
name: Healy, A.T.A.
Publisher: name: Unknown
Year: 1969
Subjects: Livestock Production/Industries

description: Multi-stage linear programming is used to develop sheep replacement policies in a number of different situations. Policies are developed for eight and sixteen year periods assuming, firstly a constant feed supply, and secondly, an increasing feed supply over the period. The results show the optimal flock composition together with the sheep sale activities for each year of the plan. The marginal value products indicate which constraints are the most important and whether any should be relaxed in order to make the model more realistic. It is concluded that it is not necessary to use a very long planning period in order to determine the activities for the early years. The results from the shorter planning period appear to be consistent with long-term goals.
Polarization, piezoelectric constants and elastic constants of ZnO, MgO and CdO
Creators: name: Gopal, Priya
name: Spaldin, Nicola
Publisher: name: arXiv
Year: 2005
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We report first principles density functional calculations of the spontaneous polarizations, piezoelectric constants and elastic constants for the II-VI wurtzite structure ZnO, MgO and CdO. Using our self interaction corrected implementation of density functional theory we obtain polarization values of we obtain polarization values of -0.05, -0.17 and -0.10 C/m$^2$, and piezoelectric constants, $e_{33}$ ($e_{31}$) of 1.34 (-0.57), 2.26 (-0.38) and 1.67 (-0.48) C/m$^2$ for structurally relaxed ZnO, MgO and CdO respectively. These properties are consistently larger in magnitude than the corresponding GaN, AlN and InN analogues. Therefore we predict that larger internal fields will be attainable in ZnO-based polarization field effect transistors than in equivalent GaN-based devices.
description: 7 pages, 2 figures, 3 tables
29. White dwarf surveys
Creators: name: Perryman, Michael
Publisher: name: Zenodo
Year: 2021

description: White dwarfs are of great importance for theories of star formation and evolution, of degenerate matter at extremely high density, for distance scale determination, and for understanding planet survival beyond a star's main-sequence lifetime. Pre-Gaia, known numbers were around 10,000. Gaia is in the process of characterising some 100,000.
A SIMULATED STUDY OF AN AUCTION MARKET
Creators: name: Whan, R.B.
name: Richardson, Robert A.
name: Whan, R.B.
name: Richardson, Robert A.
Publisher: name: Unknown
Year: 1969
Subjects: subject: Marketing
subject: FOS: Economics and business

description: A simulated model of an auction market is developed showing the relationship between the variation in valuations, the price variation and the number of independent bidders in the market. Average prices paid in a market with two or three bidders are less than average valuations. Average prices are progressively greater than average valuations as the number of bidders increases beyond four. Some applications of this model in the Australian wool market are discussed.