cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Multivariate AIM Consumer Demand Model Applied to Dried Fruit, Raisins, and Dried Plums
Creators: name: Brant, Molly
name: Marsh, Thomas L.
name: Featherstone, Allen M.
name: Crespi, John M.
name: Brant, Molly
name: Marsh, Thomas L.
name: Featherstone, Allen M.
name: Crespi, John M.
Publisher: name: Unknown
Year: 2005
Subjects: subject: Demand and Price Analysis
subject: demand
subject: consumers
subject: AIM

description: Abstract: We estimate a semi-nonparametric demand system based on a multivariate version of the Muntz-Szatz series expansion which is called the Asymptotically Ideal Model (AIM). The model is applied to consumer demand for dried fruits, raisins, and dried plums. Results from the first and second order AIM expansions suggest that the second order expansion leads to a more economically consistent model, but the likelihood ratio test indicates the AIM(2) model was not a statistical improvement over the AIM(1) model.
Credit Risk Migration Analysis of Illinois Farm Business: Possible Impacts of Farm Business Cycle
Creators: name: Zhang, Tianwei
name: Katchova, Ani L.
name: Zhang, Tianwei
name: Katchova, Ani L.
Publisher: name: Unknown
Year: 2005
Subjects: Agricultural Finance

description: This study uses the cohort approach to estimate the credit risk migration probability of farm business. Using data from the Farm Business and Farm Management, this study rates the credit risk into 10 risk levels plus a default level, defines a farm business cycle with peak, normal and trough periods and evaluates the effect on farm financial performance of the farm business booms and slumps. The results show that the farms with low credit risk are more likely to stay in the same risk level but the farms with high credit risk have the trend to improve their risk situation and move upwards. The results also show that the credit risk ratings are more likely to move upgrade during farm business cycle peaks.
34. Perspective acceleration
Creators: name: Perryman, Michael
Publisher: name: Zenodo
Year: 2021

description: For a fixed space velocity, a star's proper motion varies inversely with its distance. However, the tangential velocity changes due to the varying angle between the line-of-sight and its space velocity.  The two effects result in a changing proper motion and, for a few nearby stars, an apparent acceleration of the star's motion on the sky.
INTEGRATION IN BENIN MAIZE MARKET: AN APPLICATION OF THRESHOLD COINTEGRATION ANALYSIS
Creators: name: McKenzie, Andrew M.
name: Pede, Valerien O.
name: McKenzie, Andrew M.
name: Pede, Valerien O.
Publisher: name: Unknown
Year: 2005
Subjects: subject: Marketing
subject: FOS: Economics and business

description: The degree to which markets are spatially efficient has important implications for market liberalization and other policy reforms. After several attempts to control and regulate the marketing of maize in Benin, a liberalized free-market system was finally adopted in 1990. It was assumed that a free-market system would perform more efficiently and enhance maize market integration compared with the more government oriented systems of the past. However, trade barriers still exist in the form of traders' associations across market locations. Recent market integration literature has focused on the influence of transaction costs and threshold effects on tests for integration. Hansen and Seo's two regime threshold cointegration model is used to analyze the degree of integration between seven Benin maize markets for the September 1998 to September 2001 period. We find mixed evidence of threshold cointegration. Threshold effects are found in thirteen out of twenty-one market pairs. However, threshold estimates are not consistent with observed transaction costs and further investigation of error-correction parameter estimates cast some doubt as to the validity of some of the threshold results. We conclude that the two regime threshold model may not adequately capture the trade barriers associated with the traders' associations.
How low can you go? Privacy-preserving people detection with an omni-directional camera
Creators: name: Callemein, Timothy
name: Van Beeck, Kristof
name: Goedemé, Toon
Publisher: name: arXiv
Year: 2020
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: In this work, we use a ceiling-mounted omni-directional camera to detect people in a room. This can be used as a sensor to measure the occupancy of meeting rooms and count the amount of flex-desk working spaces available. If these devices can be integrated in an embedded low-power sensor, it would form an ideal extension of automated room reservation systems in office environments. The main challenge we target here is ensuring the privacy of the people filmed. The approach we propose is going to extremely low image resolutions, such that it is impossible to recognise people or read potentially confidential documents. Therefore, we retrained a single-shot low-resolution person detection network with automatically generated ground truth. In this paper, we prove the functionality of this approach and explore how low we can go in resolution, to determine the optimal trade-off between recognition accuracy and privacy preservation. Because of the low resolution, the result is a lightweight network that can potentially be deployed on embedded hardware. Such embedded implementation enables the development of a decentralised smart camera which only outputs the required meta-data (i.e. the number of persons in the meeting room).
Phenomenology of Mixed Modulus-Anomaly Mediation in Fluxed String Compactifications and Brane Models
Creators: name: Choi, Kiwoon
name: Jeong, Kwang Sik
name: Okumura, Ken-ichi
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: In some string compactifications, for instance the recently proposed KKLT set-up, light moduli are stabilized by nonperturbative effects at supersymmetric AdS vacuum which is lifted to a dS vacuum by supersymmetry breaking uplifting potential. In such models, soft supersymmetry breaking terms are determined by a specific mixed modulus-anomaly mediation in which the two mediations typically give comparable contributions to soft parameters. Similar pattern of soft terms can arise also in brane models to stabilize the radion by nonperturbative effects. We examine some phenomenological consequences of this mixed modulus-anomaly mediation, including the pattern of low energy sparticle spectrum and the possibility of electroweak symmetry breaking. It is noted that adding the anomaly-mediated contributions at $M_{GUT}$ amounts to replacing the messenger scale of the modulus mediation by a mirage messenger scale $(m_{3/2}/M_{Pl})^{α/2}M_{GUT}$ where $α=m_{3/2}/[M_0\ln(M_{Pl}/m_{3/2})]$ for $M_0$ denoting the modulus-mediated contribution to the gaugino mass at $M_{GUT}$. The minimal KKLT set-up predicts $α=1$. As a consequence, for $α={\cal O}(1)$, the model can lead to a highly distinctive pattern of sparticle masses at TeV scale, particularly when $α= 2$.
description: 20 pages, 15 figures, some notations are changed, typos are corrected and discussions on the CP phase from $\mu$ and B are added
The Newtonian limit at intermediate energies
Creators: name: Cembranos, J. A. R.
Publisher: name: arXiv
Year: 2005
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We study the metric solutions for the gravitational equations in Modified Gravity Models (MGMs). In models with negative powers of the scalar curvature, we show that the Newtonian Limit (NL) is well defined as a limit at intermediate energies, in contrast with the usual low energy interpretation. Indeed, we show that the gravitational interaction is modified at low densities or low curvatures.
description: 4 pages, REVTeX 4; minor typos corrected, one reference added
Softwarization, Virtualization, & Machine Learning For Intelligent & Effective V2X Communications
Creators: name: Moubayed, Abdallah
name: Shami, Abdallah
Publisher: name: arXiv
Year: 2020
Subjects: subject: Networking and Internet Architecture (cs.NI)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: The concept of the fifth generation (5G) mobile network system has emerged in recent years as telecommunication operators and service providers look to upgrade their infrastructure and delivery modes to meet the growing demand. Concepts such as softwarization, virtualization, and machine learning will be key components as innovative and flexible enablers of such networks. In particular, paradigms such as software-defined networks, software-defined perimeter, cloud & edge computing, and network function virtualization will play a major role in addressing several 5G networks' challenges, especially in terms of flexibility, programmability, scalability, and security. In this work, the role and potential of these paradigms in the context of V2X communication is discussed. To do so, the paper starts off by providing an overview and background of V2X communications. Then, the paper discusses in more details the various challenges facing V2X communications and some of the previous literature work done to tackle them. Furthermore, the paper describes how softwarization, virtualization, and machine learning can be adapted to tackle the challenges of such networks.
description: 14 pages, 6 figures, 3 tables, Accepted in IEEE Intelligent Transportation Systems Magazine
Adjusting Monetary Measures of Poverty to Non-Monetary Aspects: An Analysis Based on Sri Lankan Data
Creators: name: Weerahewa, Jeevika
name: Wickramasinghe, Kanchana
name: Weerahewa, Jeevika
name: Wickramasinghe, Kanchana
Publisher: name: Unknown
Year: 2005
Subjects: subject: Institutional and Behavioral Economics
subject: Measurement of Poverty
subject: Social Climate
subject: Sri Lanka

description: This paper reassesses the status of poverty in Sri Lanka using a monetary measure which was adjusted for people's perceptions about the social climate. Data collected by the Sri Lanka Integrated Survey was used to obtain incidences of poverty using cost of basic need (CBN) poverty lines and poverty lines adjusted for people's perceptions. The results reveal that the poverty measurements significantly differ with the two approaches though poverty ranking remains more or less consistent.
Rheology of protein-stabilised emulsion gels envisioned as composite networks. 1 -- Comparison of pure droplet gels and protein gels
Creators: name: Roullet, Marion
name: Clegg, Paul S.
name: Frith, William J.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Protein-stabilised emulsion gels can be studied in the theoretical framework of colloidal gels, because both protein assemblies and droplets may be considered as soft colloids. These particles differ in their nature, size and softness, and these differences may have an influence on the rheological properties of the gels they form. Pure gels made of milk proteins (sodium caseinate), or of sub-micron protein-stabilised droplets, were prepared by slow acidification of suspensions at various concentrations. Their microstructure was characterised, their viscoelasticity, both in the linear and non-linear regime, and their frequency dependence were measured, and the behaviour of the two types of gels was compared. Protein gels and droplet gels were found to have broadly similar microstructure and rheological properties when compared at fixed volume fraction, a parameter derived from the study of the viscosity of the suspensions formed by proteins and by droplets. The viscoelasticity displayed a power law behaviour in concentration, as did the storage modulus in frequency. Additionally, strain hardening was found to occur at low concentration. These behaviours differed slightly between protein gels and droplet gels, showing that some specific properties of the primary colloidal particles play a role in the development of the rheological properties of the gels.
description: 27 pages, 6 figures
Single Stranded DNA Translocation Through a Fluctuating Nanopore
Creators: name: Flomenbom, O.
name: Klafter, J.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Subcellular Processes (q-bio.SC)
subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Biological sciences
subject: FOS: Physical sciences

description: We investigate the translocation of a single stranded DNA (ssDNA) through a pore, which fluctuates between two conformations, by using coupled master equations (ME). The probability density function (PDF) of the first passage times (FPT) of the translocation process is calculated, displaying a triple, double or mono-peaked behavior, depending on the system parameters. An analytical expression for the mean first passage time (MFPT) of the translocation process is derived, and provides an extensive characterization of the translocation process.
description: 6 pages, 3 figures
Proper Motions of the BN Object and the I Radio Source in Orion: Where and When Did BN Become a Runaway Star?
Creators: name: Rodriguez, Luis F.
name: Poveda, Arcadio
name: Lizano, Susana
name: Allen, Christine
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present absolute astrometry of the core of the Orion molecular cloud, made with Very Large Array archive data taken over the last two decades. Our analysis reveals that both the BN object and the radio source I have proper motions: the BN object has a proper motion of $12.6 \pm 0.6$ mas yr$^{-1}$ (corresponding to a velocity of $27 \pm 1$ km s$^{-1}$ at an adopted distance of 450 pc) to the northwest, while the radio source I has a proper motion of $5.6 \pm 0.7$ mas yr$^{-1}$ (corresponding to a velocity of $12 \pm 2$ km s$^{-1}$) to the southeast. The motion of the two sources is nearly antiparallel, diverging from a point in between them, where they were located about 500 years ago. These results suggest that the BN object and the radio source I were part of a multiple young stellar system that disintegrated in the recent past.
description: 13 pages, 3 figures
FOR WHOM REDUCED PRICES COUNT: A CENSORED QUANTILE REGRESSION ANALYSIS OF VEGETABLE DEMAND
Creators: name: Gustavsen, Geir Waehler
name: Rickertsen, Kyrre
name: Gustavsen, Geir Waehler
name: Rickertsen, Kyrre
Publisher: name: Unknown
Year: 2004
Subjects: Food Consumption/Nutrition/Food Safety

description: Low consumption of vegetables is linked to many diseases. From a health perspective, the distribution of consumption is at least as important as mean consumption. We investigated the differential effects of policy changes on high- and low-consuming households by using 15,700 observations from 1986 to 1997. Many households did not purchase vegetables during the two-week survey periods and censored as well as ordinary quantile regressions were estimated. Removal of the value added tax for vegetables, income increases, and health information are unlikely to substantially increase purchases in low-consuming households. Nevertheless, information provision is cheap and best targeted at low-consuming households.
A spectroscopic study of MATLAS-2019 with MUSE: an ultra-diffuse galaxy with an excess of old globular clusters
Creators: name: Müller, Oliver
name: Marleau, Francine R.
name: Duc, Pierre-Alain
name: Habas, Rebecca
name: Fensch, Jérémy
name: Emsellem, Eric
name: Poulain, Mélina
name: Lim, Sungsoon
name: Agnello, Adriano
name: Durrell, Patrick
name: Paudel, Sanjaya
name: Sánchez-Janssen, Rubén
name: van der Burg, Remco F. J.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: The MATLAS deep imaging survey has uncovered a plethora of dwarf galaxies in the low density environment it has mapped. A fraction of them are unusually extended and have a low-surface brightness. Among these so-called ultra-diffuse galaxies, a few seem to host an excess of globular clusters. With the integral-field unit spectrograph MUSE we have observed one of these galaxies - MATLAS J15052031+0148447 (MATLAS-2019) - located towards the nearby group NGC 5846 and measured its systemic velocity,age, and metallicity, and that of its globular clusters candidates. For the stellar body of MATLAS-2019 we derive a metallicity of -1.33+0.19-0.01 dex and an age of 11.2+1.8-0.8 Gyr. For some of the individual GCs and the stacked GC population, we derive consistent ages and metallicities. From the 11 confirmed globular clusters and using a Markov Chain Monte Carlo approach we derived a dynamical mass-to-light ratio of 4.2+8.6-3.4M/L. This is at the lower end of the luminosity-mass scaling relation defined by the Local Group dwarf galaxies. Furthermore, we couldn't confirm nor reject the possibility of a rotational component of the GC system. If present, this would further modify the inferred mass. Follow-up observations of the globular cluster population and of the stellar body of the galaxy are needed to assess whether this galaxy is lacking dark matter like it was suggested for the pair of dwarf galaxies in the field of NGC 1052, or if this is a miss-interpretation arising from systematic uncertainties of the method commonly used for these systems and the large uncertainties of the individual globular cluster velocities.
description: 10 pages, 9 figures, 2 tables, accepted for publication in A&A
Land Cover and Socio-economic Characteristics in the Eight Counties of Alabama: A Spatial Analysis
Creators: name: Gyawali, Buddhi Raj
name: Fraser, Rory
name: Wang, Yong
name: Bukenya, James O.
name: Gyawali, Buddhi Raj
name: Fraser, Rory
name: Wang, Yong
name: Bukenya, James O.
Publisher: name: Unknown
Year: 2004
Subjects: Institutional and Behavioral Economics

description: This study employed a clustering algorithm and a logistic regression analysis to examine the relationship between cropland and demographic attributes obtained at the census block group level. The result indicated that population density, African Americans, and poverty are significantly related with crop land use in the region.
On the puzzle of Bremsstrahlung as described by coaccelerated observers
Creators: name: Peña, I.
name: Chryssomalakos, C.
name: Corichi, A.
name: Sudarsky, D.
Publisher: name: arXiv
Year: 2005
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We consider anew some puzzling aspects of the equivalence of the quantum field theoretical description of Bremsstrahlung from the inertial and accelerated observer's perspectives. More concretely, we focus on the seemingly paradoxical situation that arises when noting that the radiating source is in thermal equilibrium with the thermal state of the quantum field in the wedge in which it is located, and thus its presence does not change there the state of the field, while it clearly does not affect the state of the field on the opposite wedge. How then is the state of the quantum field on the future wedge changed, as it must in order to account for the changed energy momentum tensor there? This and related issues are carefully discussed.
description: 29 pages, 1 figure; Revtex, minor changes, PACS corrected
AGRICULTURAL AND FOREST LANDUSE CHANGES, AND THE ENVIRONMENTAL KUZNETS CURVE FOR DEFORESTATION: AN INTERTEMPORAL DYNAMIC EQUILIBRIUM
Creators: name: Bhattarai, Madhusudan
name: Hammig, Michael D.
name: Paudel, Krishna P.
name: Bhattarai, Madhusudan
name: Hammig, Michael D.
name: Paudel, Krishna P.
Publisher: name: Unknown
Year: 2004
Subjects: Land Economics/Use

description: This study is an investigation of the process of land conversion from forest to agricultural production, and assessing the factors affecting the process. We also analyze the conditions that would ultimately lead to the EKC type of relationship between deforestation and societal income in an economy.
A THEORETICAL DEVELOPMENT AND EMPIRICAL TEST ON THE CONVERGENCE OF AGRICULTURAL PRODUCTIVITY IN THE USA
Creators: name: Paudel, Krishna P.
name: Sambidi, Pramod R.
name: Sulgham, Anil K.
name: Paudel, Krishna P.
name: Sambidi, Pramod R.
name: Sulgham, Anil K.
Publisher: name: Unknown
Year: 2004
Subjects: Research Methods/ Statistical Methods

description: This study explores the evidence of convergence in the U.S agriculture sector by using the state level total factor productivity (TFP) data. The empirical investigation conducted in this study does not find any evidence of convergence while looking at the state level TFP. However, there seems to be some support for convergence at the regional level. Parametric and nonparametric models indicate significant role of human capital in explaining the regional discrepancies in agriculture productivity across states.
Studies of N. sylvestris plant cell cultures in the biotransformation of dibenzylbutanolides
Creators: name: Lam, Edward Charles
Publisher: name: University of British Columbia
Year: 2009

description: The studies in this thesis investigate the possible use of plant cell cultures in combination with synthetic chemistry in developing new and inexpensive routes to podophyllotoxin (1) and related aryltetralins. Also of some interest was the characterization of reaction parameters involved in successfully performing biotransformations using these cultures. To that end 65, 113, and 114 were obtained or synthesized from readily available aromatic aldehydes, and employed in a "one-pot" tandem conjugate addition to produce 111 and 112. The substrates 108, 109, and 110 were then readily obtained by debenzylation. Biotransformation of these substrates was then carried out using peroxidase-rich broth from plant cell cultures of Nicotiana sylvestris as a reaction medium. [Figures.] Biotransformation of dibenzylbutanolide 108 with broth from 10 day old cell culture was found to result in the production of ketone 128. The effects of such factors as culture age, hydrogen peroxide level, and peroxidase activity on the outcome of the biotransformation were investigated. It was found that using broth from older, 30 day old cultures resulted in fragmentation of the substrate, giving 131 and 132. The biotransformation of dibenzylbutanolide 109 was also carried out, and was also found to give ketone 128. A similar outcome was observed when compound 110 was subject to biotransformation, which gave ketone 139 as the product. [Figures.]
REVISITING ERROR AUTOCORRELATION CORRECTION: COMMON FACTOR RESTRICTIONS AND GRANGER CAUSALITY
Creators: name: McGuirk, Anya M.
name: Spanos, Aris
name: McGuirk, Anya M.
name: Spanos, Aris
Publisher: name: Unknown
Year: 2004
Subjects: Research Methods/ Statistical Methods

description: This paper demonstrates that linear regression models with an AR(1) error structure implicitly assume that y{t} does not Granger cause any of the exogenous variables in X{t}. An indirect test of the common factor restrictions based on this Granger non-causality is proposed and shown to outperform existing tests.
BVAR-Connect: A Variational Bayes Approach to Multi-Subject Vector Autoregressive Models for Inference on Brain Connectivity Networks
Creators: name: Kook, Jeong Hwan
name: Vaughn, Kelly A.
name: DeMaster, Dana M.
name: Ewing-Cobbs, Linda
name: Vannucci, Marina
Publisher: name: arXiv
Year: 2020
Subjects: subject: Applications (stat.AP)
subject: FOS: Computer and information sciences

description: In this paper we propose BVAR-connect, a variational inference approach to a Bayesian multi-subject vector autoregressive (VAR) model for inference on effective brain connectivity based on resting-state functional MRI data. The modeling framework uses a Bayesian variable selection approach that flexibly integrates multi-modal data, in particular structural diffusion tensor imaging (DTI) data, into the prior construction. The variational inference approach we develop allows scalability of the methods and results in the ability to estimate subject- and group-level brain connectivity networks over whole-brain parcellations of the data. We provide a brief description of a user-friendly MATLAB GUI released for public use. We assess performance on simulated data, where we show that the proposed inference method can achieve comparable accuracy to the sampling-based Markov Chain Monte Carlo approach but at a much lower computational cost. We also address the case of subject groups with imbalanced sample sizes. Finally, we illustrate the methods on resting-state functional MRI and structural DTI data on children with a history of traumatic injury.
description: Neuroinformatics (2020), in press
Diffraction-contrast imaging of cold atoms
Creators: name: Turner, L. D.
name: Domen, K. F. E. M.
name: Scholten, R. E.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We consider the inverse problem of in-line holography, applied to minimally-destructive imaging of cold atom clouds. Absorption imaging near-resonance provides a simple, but destructive measurement of atom column density. Imaging off resonance greatly reduces heating, and sequential images may be taken. Under the conditions required for off-resonant imaging, the generally-intractable inverse problem may be linearized. A minimally-destructive, quantitative and high-resolution image of the atom cloud column density is then retrieved from a single diffraction pattern.
description: 4 pages, 3 figures v2: minor changes in response to referee reports, mostly additional experimental detail v3: revisions to figure 3: added trace and changed image. Minor text and referencing changes. Accepted by Phys Rev A (Rapid Commun)
EVALUATING NON-PRICE WATER DEMAND POLICIES DURING SEVERE DROUGHTS
Creators: name: Schuck, Eric C.
name: Proft, Rebecca
name: Schuck, Eric C.
name: Proft, Rebecca
Publisher: name: Unknown
Year: 2004
Subjects: Resource /Energy Economics and Policy

description: This research examines how differing frequencies of water use restrictions affected per-capita water demand in three medium-sized municipalities along the Front Range of Colorado during the 2002 drought. Preliminary results indicate that while one- or two-day per week watering restrictions limit per capita water use, voluntary restrictions may actually promote overuse of water as consumers prepare for more stringent restrictions.
TWO ESSAYS ON COUNTRY LIFE IN 20TH CENTURY AMERICA
Creators: name: Wunderlich, Gene
name: Wunderlich, Gene
Publisher: name: Unknown
Year: 2004
Subjects: Community/Rural/Urban Development

description: The two brief essays that follow describe: 1) the American Country Life Association's mission and legacy (Theodore Roosevelt's Country Life Commission and the American Country Life Association, by Gene Wunderlich); 2) a mid-century effort to create a new Country Life Commission (Teddy Roosevelt's Silent Echo: The Second Country Life Commission, by Gene Wunderlich).
ON THE RETURN TO JOURNAL QUALITY, COAUTHORSHIP AND AUTHOR ORDER WITHIN TOP RANKED AGRICULTURAL ECONOMICS PROGRAMS
Creators: name: Hilmer, Christiana E.
name: Hilmer, Michael J.
name: Hilmer, Christiana E.
name: Hilmer, Michael J.
Publisher: name: Unknown
Year: 2004
Subjects: Teaching/Communication/Extension/Profession

description: Utilizing an original data set containing annual salaries and peer-reviewed publication histories for 326 faculty members from top-ranked Ph.D.-granting programs we examine the labor market for academic agricultural economists. The results suggest that higher quality publications have a greater impact on annual earnings, that sole authored articles have a higher return than multi-authored articles and that no wage premium exists for being the lead author of a non-alphabetic paper.
Andromeda X, A New Dwarf Spheroidal Satellite of M31: Photometry
Creators: name: Zucker, Daniel B.
name: Kniazev, Alexei Y.
name: Martinez-Delgado, David
name: Bell, Eric F.
name: Rix, Hans-Walter
name: Grebel, Eva K.
name: Holtzman, Jon A.
name: Walterbos, Rene A. M.
name: Rockosi, Constance M.
name: York, Donald G.
name: Barentine, J. C.
name: Brewington, Howard
name: Brinkmann, J.
name: Harvanek, Michael
name: Kleinman, S. J.
name: Krzesinski, Jurek
name: Long, Dan
name: Neilsen,, Eric H.
name: Nitta, Atsuko
name: Snedden, Stephanie A.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We report the discovery of Andromeda X, a new dwarf spheroidal satellite of M31, based on stellar photometry from the Sloan Digital Sky Survey (SDSS). Using follow-up imaging data we have estimated its distance and other physical properties. We find that Andromeda X has a dereddened central surface brightness of mu_V,0 ~ 26.7 mag arcsec^-2 and a total apparent magnitude of V_tot ~ 16.1, which at the derived distance modulus, (m - M)_0 ~ 24.12 - 24.34, yields an absolute magnitude of M_V ~ -8.1 +/- 0.5; these values are quite comparable to those of Andromeda IX, a previously-discovered low luminosity M31 satellite. The discoveries of Andromeda IX and Andromeda X suggest that such extremely faint satellites may be plentiful in the Local Group.
description: 4 pages, 4 figures; submitted to Astrophysical Journal Letters
Encapsulation of luminescent polymers in porous alumina
Creators: name: Kwong, Keri
Publisher: name: University of British Columbia
Year: 2009

description: The incorporation of three conjugated polymers: MEH-PPV, DP-PPV and DP10- PPV into porous alumina films on Al, Si and ITO substrates via an adsorption process is reported. The nature of this adsorption process involves bonding between Lewis acidic Al centres on the alumina and the Lewis basic polymer backbone. The MEH-PPV porous alumina hybrids was found to degrade rapidly upon the irradiation of UV-light (λext = 366 nm) in air but to a lesser extent in the dark and under nitrogen. Silanization of the pores by treatment with trimethylchlorosilane (TMS), phenyldimethylchlorosilane (PDMS) and octyldimethylchlorosilane (ODMS) resulted in lower MEH-PPV loading in porous alumina membranes (Anodisc 13) relative to the membranes with unmodified pore walls. In the fluorescence spectra, the intensity of the fluorescence from the Anodisc membranes containing MEH-PPV is higher than from MEH-PPV in silanized porous alumina. The Lewis acidic Al centres of the porous alumina in the silanized pores are screened from the Lewis basic polymer resulting in a lower fluorescence intensity. Within the silanes used, the absorbance intensity is in the order: TMS > ODMS, PDMS. Within the silanes, the difference in fluorescence intensities may be due to the size of the alkyl/aryl groups. The larger alkyl substituent in ODMS and the aryl group in PDMS may act to better screen the Lewis acidic Al than in the smaller alkyl group in TMS. In DP10-PPV, the unmodified porous alumina has a higher fluorescence intensity relative to the modified materials. This is attributed to the interactions between the pore walls and the polymer. The same screening effect that occurs for MEH-PPV is also observed for DP10-PPV. For DP10-PPV, the fluorescence intensities is in the order: PDMS > ODMS, TMS. This difference may arise from the favourable π-stacking interactions between the polymer and the PDMS silanized pores.
OPTIMAL CONTRACTS FOR EXPLORATION WITH COST RECOVERY OF AN EXHAUSTIBLE NATURAL RESOURCE UNDER ASYMMETRIC INFORMATION
Creators: name: Rahman, Shaikh Mahfuzur
name: Helal, Uddin
name: Rahman, Shaikh Mahfuzur
name: Helal, Uddin
Publisher: name: Unknown
Year: 2004
Subjects: Resource /Energy Economics and Policy

description: Exploration of an exhaustible resource with cost recovery under asymmetric information about cost is modeled and analyzed employing Principal-Agent theory. Allocation of lower than full information level of effort for the high-cost firms is found socially optimal. However, distortion is less in a two-stage process of exploration and extraction.
L-selectin mediated leukocyte tethering in shear flow is controlled by multiple contacts and cytoskeletal anchorage facilitating fast rebinding events
Creators: name: Schwarz, Ulrich S.
name: Alon, Ronen
Publisher: name: arXiv
Year: 2005
Subjects: subject: Subcellular Processes (q-bio.SC)
subject: FOS: Biological sciences

description: L-selectin mediated tethers result in leukocyte rolling only above a threshold in shear. Here we present biophysical modeling based on recently published data from flow chamber experiments (Dwir et al., J. Cell Biol. 163: 649-659, 2003) which supports the interpretation that L-selectin mediated tethers below the shear threshold correspond to single L-selectin carbohydrate bonds dissociating on the time scale of milliseconds, whereas L-selectin mediated tethers above the shear threshold are stabilized by multiple bonds and fast rebinding of broken bonds, resulting in tether lifetimes on the timescale of $10^{-1}$ seconds. Our calculations for cluster dissociation suggest that the single molecule rebinding rate is of the order of $10^4$ Hz. A similar estimate results if increased tether dissociation for tail-truncated L-selectin mutants above the shear threshold is modeled as diffusive escape of single receptors from the rebinding region due to increased mobility. Using computer simulations, we show that our model yields first order dissociation kinetics and exponential dependence of tether dissociation rates on shear stress. Our results suggest that multiple contacts, cytoskeletal anchorage of L-selectin and local rebinding of ligand play important roles in L-selectin tether stabilization and progression of tethers into persistent rolling on endothelial surfaces.
description: 9 pages, Revtex, 4 Postscript figures included
Investigation of H Sorption and Corrosion Properties of Sm2MnxNi7-x (0
Creators: name: Madern, Nicolas
name: Charbonnier, Veronique
name: Monnier, Judith
name: Zhang, Junxian
name: Paul-Boncour, Valerie
name: Latroche, Michel
Publisher: name: arXiv
Year: 2020
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Intermetallic compounds are key materials for energy transition as they form reversible hydrides that can be used for solid state hydrogen storage or as anodes in batteries. ABy compounds (A = Rare Earth (RE); B = transition metal; 2 < y < 5) are good candidates to fulfill the required properties for practical applications. They can be described as stacking of AB5 and AB2 sub-units along the c crystallographic axis. The latter sub-unit brings a larger capacity, while the former one provides a better cycling stability. However, ABy binaries do not show good enough properties for applications. Upon hydrogenation, they exhibit multiplateau behavior and poor reversibility, attributed to H induced amorphization. These drawbacks can be overcome by chemical substitutions on the A and/or the B sites leading to stabilized reversible hydrides. The present work focuses on the pseudo-binary Sm2MnxNi7-x system (0 <= x < 0.5). The structural, thermodynamic and corrosion properties are analyzed and interpreted by means of X-ray diffraction, chemical analysis, scanning electron microscopy, thermogravimetric analysis and magnetic measurements. Unexpected cell parameter variations are reported and interpreted regarding possible formation of structural defects and uneven Mn distribution within the Ni sublattice. Reversible capacity is improved for x > 0.3 leading to larger and flatter isotherm curves, allowing for reversible capacity >1.4 wt %. Regarding corrosion, the binary compound corrodes in alkaline medium to form rare earth hydroxide and nanoporous nickel. As for the Mn-substituted compounds, a new corrosion product is formed in addition to those above mentioned, as manganese initiates a sacrificial anode mechanism taking place at the early corrosion stage.
description: Special Issue : Hydrogen Storage Properties of Materials
THE WHAT, HOW AND WHERE OF NATURE CONSERVATION AND AGRICULTURE: THE CO-ORDINATION OF ECOLOGICAL-ECONOMIC, BEHAVIORAL AND SPATIAL ASPECTS
Creators: name: Wossink, Ada
name: Van Wenum, Jaap
name: Jurgens, Clifford
name: De Snoo, Geert
name: Wossink, Ada
name: Van Wenum, Jaap
name: Jurgens, Clifford
name: De Snoo, Geert
Publisher: name: Unknown
Year: 1997
Subjects: Environmental Economics and Policy

description: An approach is presented to address three questions: (a) what is considered as valued nature at the farm level, (b) how can nature management be integrated in farming practice, i.e. operational and behavioral acceptability, and (c) where should nature management be implemented, i.e. the optimal spatial arrangement.
Investigating Transient Characteristics of Volatile Hysteresis and Self-Heating of PrMnO$_3$ based RRAM
Creators: name: Sakhuja, J.
name: Lashkare, S.
name: Jana, K.
name: Ganguly, U.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Applied Physics (physics.app-ph)
subject: FOS: Physical sciences

description: PrMnO$_3$ (PMO) based RRAM shows selector-less behavior due to high-non-linearity. Recently, the non-linearity, along with volatile hysteresis, is demonstrated and utilized as a compact oscillator to enable highly scaled oscillatory neurons, which enable oscillatory neuromorphic systems found in the human cortex. Hence, it is vital to understand the physical mechanisms behind such a volatile hysteretic behavior to provide useful insights in developing a device for various neuromorphic applications. In this paper, we present a comprehensive investigation of the transient characteristics and propose a physical mechanism to replicate the observations by simulations. First, we investigate the complex dynamics of the hysteresis with the voltage ramp rate. We observe that the voltage window initially increases and later decreases as the ramp rate is increased - while the current window reduces monotonically. Second, an analytical electrothermal model based on space charge limited current (SCLC) and Fourier Heat equation is proposed to model the co-dependent heat and current flow. Finally, we show that the interplay between the self-heating due to the current and the current dependence on the temperature is accurately modeled to reproduce the hysteresis dependence on the various voltage ramp rate. Such a detailed understanding of the device PMO RRAM volatile hysteresis may enable efficient device design required in neuromorphic computing applications.
Algebraic Properties for Selector Functions
Creators: name: Hemaspaandra, Lane A.
name: Hempel, Harald
name: Nickelsen, Arfst
Publisher: name: arXiv
Year: 2005
Subjects: subject: Computational Complexity (cs.CC)
subject: FOS: Computer and information sciences
subject: F.1.3; F.1.2; F.1.1

description: The nondeterministic advice complexity of the P-selective sets is known to be exactly linear. Regarding the deterministic advice complexity of the P-selective sets--i.e., the amount of Karp--Lipton advice needed for polynomial-time machines to recognize them in general--the best current upper bound is quadratic [Ko, 1983] and the best current lower bound is linear [Hemaspaandra and Torenvliet, 1996]. We prove that every associatively P-selective set is commutatively, associatively P-selective. Using this, we establish an algebraic sufficient condition for the P-selective sets to have a linear upper bound (which thus would match the existing lower bound) on their deterministic advice complexity: If all P-selective sets are associatively P-selective then the deterministic advice complexity of the P-selective sets is linear. The weakest previously known sufficient condition was P=NP. We also establish related results for algebraic properties of, and advice complexity of, the nondeterministically selective sets.
description: More recent version of most of this report appears in SICOMP, but the appendix here is not included there
35. Stellar flybys
Creators: name: Perryman, Michael
Publisher: name: Zenodo
Year: 2021

description: Although interstellar space is very empty, noticeable effects due to nearby star passages can occur. A predicted consequence of a close approach is that the gravitational pull of the passing star can perturb the delicate equilibrium of the Oort cloud comets, with the possibility of an increased impact hazard on Earth.
Application of LEAN Principles to Improve Business Processes: a Case Study in Latvian IT Company
Creators: name: Nikiforova, Anastasija
name: Bicevska, Zane
Publisher: name: arXiv
Year: 2020
Subjects: subject: Software Engineering (cs.SE)
subject: Computers and Society (cs.CY)
subject: Databases (cs.DB)
subject: FOS: Computer and information sciences

description: The research deals with application of the LEAN principles to business processes of a typical IT company. The paper discusses LEAN principles amplifying advantages and shortcomings of their application. The authors suggest use of the LEAN principles as a tool to identify improvement potential for IT company's business processes and work-flow efficiency. During a case study the implementation of LEAN principles has been exemplified in business processes of a particular Latvian IT company. The obtained results and conclusions can be used for meaningful and successful application of LEAN principles and methods in projects of other IT companies.
description: 24 pages, 7 figure, 4 tables, Baltic J. Modern Computing
High-Level Penetration of Renewable Energy with Grid: Challenges and Opportunities
Creators: name: Alam, Md Shafiul
name: Al-Ismail, Fahad Saleh
name: Abido, M. A.
name: Salem, Aboubakr
Publisher: name: arXiv
Year: 2020
Subjects: subject: Systems and Control (eess.SY)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: The utilization of renewable energy sources (RESs) has become significant throughout the world especially over the last two decades. Although high-level RESs penetration reduces negative environmental impact compared to conventional fossil fuel based energy generation, control issues become more complex as well as total inertia to the system is significantly decreased due to removal of conventional synchronous generators. Some other technical issues, high uncertainties, low fault ride through capability, high fault current, low generation reserve, and low power quality, arise due to RESs integration. Renewable energy like solar and wind are highly uncertain due to intermittent nature of wind and sunlight. Cutting edge technologies including different control strategies, optimization techniques, energy storage devices, and fault current limiters are employed to handle those issues. This paper summarizes several challenges in the integration process of high-level RESs to the existing grid. The respective solutions to each challenge are also discussed. A comprehensive list of challenges and opportunities, for both wind and solar energy integration cases, are well documented. Also, the future recommendations are provided to solve the several problems of renewable integration which could be key research areas for the industry personnel and researchers.
Robust conductance zeroes in graphene quantum dots and other bipartite systems
Creators: name: Nita, M.
name: Tolea, M.
name: Marinescu, D. C.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Within the Landauer transport formalism we demonstrate that conductance zeroes are possible in bipartite systems at half-filling when leads are contacted to different sublattice sites. In particular, we investigate the application of this theory to graphene quantum dots with leads in the armchair configuration. The obtained conductance cancellation is robust in the presence of any single-site impurity.
EUROPEAN UNION ENLARGEMENT: WHAT ARE THE AGRICULTURAL TRADE MODELS MISSING?
Creators: name: Swaminathan, Padma V.
name: Hertel, Thomas W.
name: Brockmeier, Martina
name: Swaminathan, Padma V.
name: Hertel, Thomas W.
name: Brockmeier, Martina
Publisher: name: Unknown
Year: 1997
Subjects: International Relations/Trade

description: This paper quantifies the potential impact of European Union enlargement and the consequences of ignoring the non-agricultural component of this integration. We find that agriculture-focused studies offer sound estimates of agriculture-specific production and trade changes, but the estimates of trade volume changes, and welfare gains are far too low.
Separability, plane wave limits and black holes
Creators: name: Papadopoulos, G.
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We present a systematic construction of the Penrose coordinates and plane wave limits of spacetimes for which both the null Hamilton-Jacobi and geodesic equations separate. The method is illustrated for the Kerr-NUT-(A)dS four-dimensional black holes. The plane wave limits of the near horizon geometry of the extreme Kerr black hole are also explored. All near horizon geometries of extreme black holes with a Killing horizon admit Minkowski spacetime as a plane wave limit.
description: 15 pages
Lopsided Satellite Distributions around Isolated Host Galaxies
Creators: name: Brainerd, Tereasa G.
name: Samuels, Adam
Publisher: name: arXiv
Year: 2020
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We investigate the spatial distribution of the satellites of bright, isolated host galaxies. In agreement with previous studies, we find that, on average, the satellites of red hosts are found preferentially close to their hosts' major axes, while the satellites of blue hosts are distributed isotropically. We compute the pairwise clustering of the satellites and find a strong tendency for pairs of satellites to be located on the same side of their host, resulting in lopsided distributions. The signal is most pronounced for the satellites of blue hosts, where the number of pairs on the same side of their host exceeds the number of pairs on opposite sides of their by a factor of 1.8 +/- 0.1. For the satellites of red hosts, the number of pairs on the same side of their host exceeds the number of pairs on opposite sides of their host by a factor of 1.08 +/- 0.03. Satellites that are far from their hosts (r_p > 300 kpc) show a strong preference for being located on the same side of their hosts; satellites that are near to their hosts (r_p < 100 kpc) show a weak preference for being located on opposite sides of their hosts. While lopsided distributions have been found previously for the satellites of bright pairs of galaxies, ours is the first study to find lopsided distributions for the satellites of isolated bright galaxies.
description: 9 pages, 5 figures, accepted for publication in ApJ Letters