cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Large time convergence of the non-homogeneous Goldstein-Taylor Equation
Creators: name: Arnold, Anton
name: Einav, Amit
name: Signorello, Beatrice
name: Wöhrer, Tobias
Publisher: name: arXiv
Year: 2020
Subjects: subject: Analysis of PDEs (math.AP)
subject: Mathematical Physics (math-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: The Goldstein-Taylor equations can be thought of as a simplified version of a BGK system, where the velocity variable is constricted to a discrete set of values. It is intimately related to turbulent fluid motion and the telegrapher's equation. A detailed understanding of the large time behaviour of the solutions to these equations has been mostly achieved in the case where the relaxation function, measuring the intensity of the relaxation towards equally distributed velocity densities, is constant. The goal of the presented work is to provide a general method to tackle the question of convergence to equilibrium when the relaxation function is not constant, and to do so as quantitatively as possible. In contrast to the usual modal decomposition of the equations, which is natural when the relaxation function is constant, we define a new Lyapunov functional of pseudodifferential nature, one that is motivated by the modal analysis in the constant case, that is able to deal with full spatial dependency of the relaxation function. The approach we develop is robust enough that one can apply it to multi-velocity Goldstein-Taylor models, and achieve explicit rates of convergence. The convergence rate we find, however, is not optimal, as we show by comparing our result to the that found in the work of Bernard and Salvarani from 2013.
description: 36 pages, 2 figures
Investigating the components of assessing the internal auditi effectiveness in Iran
Creators: name: Rahmani, Ali
Publisher: name: figshare
Year: 2020
Subjects: subject: 150103 Financial Accounting
subject: FOS: Economics and business

description: Since adding value to the organization is the main goal of internal audit, So it should be effective, therefore, it is important to recognize the components in evaluating the effectiveness of internal audit in Iran. The main purpose of this study is to determine the criteria for evaluating the effectiveness of internal audit in Iran. Questionnaire was the Data collection for this study. In this study, One- Sample T-Test and Friedman were used for analysing data. The findings show that there are Three important factors in assessing the effectiveness of internal audit in Iran according to the respondents' view point: 1) Having oral communication, writing, listening and Interpersonal skills are necessary for internal auditors in performing their tasks; 2) the lack of restrictions of internal audit on access to documents, personnel, assets, sectors and resources, 3) Having objective and unbiased viewpoints and avoiding to present assurance services for an activity that had previously been in charge of it, respectively. Also Considering that one of the internal audit functions is Implementation of management audit, Components mentioned in this research could also be used to assess the effectiveness of managemen
Analysis of Budget Policy on Agriculture under Different Governance Regimes
Creators: name: Ayoola, Gbolagade Babalola
name: Ayoola, Gbolagade Babalola
Publisher: name: Unknown
Year: 2006
Subjects: subject: Agricultural and Food Policy
subject: budget policy
subject: governance regimes
subject: factual-counterfactual
subject: preference for agriculture
subject: capital allocation
subject: recurrent allocation
subject: total allocation

description: Towards resolving the role of governance in economic development, a model of factualcounterfactual analysis was formulated to determine the relative preference of two different regimes for agriculture in the public expenditure budget of developing countries. The poster is in eight main slides: Introduction (1); Model presentation (2, 3); Application to Nigeria (4,5); Empirical Results (6, 7); Conclusion (8). The results indicate that (a) the military showed greater preference for capital allocations to agriculture in the budget while the civil regime showed greater preference for recurrent allocation, which reflects the presence of strong opposition during the civilian regime that tends to over blow the size of civil service workforce engaged in agricultural policy administration together with the attendant recurrent commitments such as personal emoluments and general overhead; and (b) on the whole the civil regime reveals greater preference in terms of the total budget than the military regime, which suggests that the incremental recurrent expenditure during the civilian regime more than offsets the incremental capital expenditure during the military regime. Thus the scope for budget restructuring in favour agricultural growth through higher capital allocations in the public expenditure budget exists in the present dem ocratic dispensation to a larger extent than during the previous dictatorship under the military regime.
Is the Green Revolution Vanishing? Empirical Evidence from TFP Analysis for Rice
Creators: name: Adlas, J.
name: Achoth, Lalith
name: Adlas, J.
name: Achoth, Lalith
Publisher: name: Unknown
Year: 2006
Subjects: subject: Crop Production/Industries
subject: Research and Development/Tech Change/Emerging Technologies
subject: Technological change
subject: productivity
subject: rice
subject: India

description: A serious concern has been raised recently on the long run sustainability of the productivity effects of Green Revolution technologies in the light of decelerating trend in the yield growth of rice since the mid 1980s under irrigated ecosystem. However, the changes in physical yield are not true measures of productivity from efficiency perspective. Total factor productivity (TFP) is a true measure of economic efficiency of any technology impact. The paper addresses the crucial issue of "is green revolution vanishing" empirically by analyzing TFP for rice in India. Results suggest that various modern technologies (such as modern cultivars) adopted by the farmers over the period have continued to make considerable impact on rice productivity growth-as reflected in the increasing trend of TFP growth. However, rate of increase in TFP growth has started to decelerate under the irrigated ecosystem during the late GR period. This implies that 'level' of productivity impact of the successive generations of modern technologies (such as new modern cultivars) has apparently been going down. This is not unusual to experience plateau or deceleration in TFP growth in the progressive areas because TFP level can not be increased at the same rate during the late GR period as it was during the early GR period.
Boundary-layer profiles of particulate matter size distributions using a balloon-borne lightweight aerosol spectrometer
Creators: name: Maletto, Annick Marie
Publisher: name: University of British Columbia
Year: 2009

description: A novel method in making cost-effective size-segregated vertical profiles of PM₁₀ up to one kilometre above the earth's surface is evaluated. The performance of a commercial miniature particle mass spectrometer, the GRIMM Particle Dust Monitor 1.108, is tested for sensitivity to varying wind speed in a wind tunnel with quasi-controlled environment. The instrument's ability to take accurate "measurements is further tested against two calibrated instruments. The results show that, with calibration, the instrument is suitable for obtaining vertical profiles. The instrument was also deployed on a 5 m³ tethered balloon at two sites in the Lower Fraser Valley, British Columbia during the summer of 2001. The results of the field study provide a complete diurnal evolution of PM₁₀ in the vertical, a day time and night time comparison of mass distributions with altitude, evaluation of an elevated pollution layer, and validation with Lidar.
Angular distribution of Drell-Yan process at hadron colliders to NLO-QCD in models of TeV scale gravity
Creators: name: Mathews, Prakash
name: Ravindran, V.
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: In TeV scale gravity models, for dilepton production at hadron colliders, we present the NLO-QCD corrections for the double differential cross section in the invariant mass and scattering angle. For both ADD and RS models, the quantitative impact of QCD corrections for extra dimension searches at LHC and Tevatron are investigated. We present the K-factors for both ADD and RS models at LHC and Tevatron. Inclusion of QCD corrections to NLO stabilises the cross section with respect to scale variations.
description: 35 pages, 12 figures, version to appear in NPB
The Relationship between Book-Tax Differences and Tax Avoidance
Creators: name: Rahmani, Ali
Publisher: name: figshare
Year: 2020
Subjects: subject: 150103 Financial Accounting
subject: FOS: Economics and business

description: This paper investigates the relationship between book- tax differences with tax avoidance of firms listed in Tehran Stock Exchange during the period 2006 to 2013. We used effective tax rate method for measuring tax avoidance. Also, for more investigations, the method of Desai & Darmapala (2006) was used. This research studies correlation based on panel data. The result suggests that book- tax differences have significant relationship with tax avoidance. So, increase in tax avoidance increases the book-tax differences.
A data-driven MHD model of the weakly-ionized chromosphere
Creators: name: Yalim, Mehmet Sarp
name: Prasad, Avijeet
name: Pogorelov, Nikolai
name: Zank, Gary
name: Hu, Qiang
Publisher: name: arXiv
Year: 2020
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: The physics of the solar chromosphere is complex from both theoretical and modeling perspectives. The plasma temperature from the photosphere to corona increases from ~5,000 K to ~1 million K over a distance of only ~10,000 km from the chromosphere and the transition region. Certain regions of the solar atmosphere have sufficiently low temperature and ionization rates to be considered as weakly-ionized. In particular, this is true at the lower chromosphere. In this paper, we present an overview of our data-driven magnetohydrodynamics model for the weakly-ionized chromosphere and show a benchmark result. It utilizes the Cowling resistivity which is orders of magnitude greater than the Coulomb resistivity. Ohm's law therefore includes anisotropic dissipation. We investigate the effects of the Cowling resistivity on heating and magnetic reconnection in the chromosphere as the flare-producing active region (AR) 11166 evolves. In particular, we analyze a C2.0 flare emerging from AR11166 and find a normalized reconnection rate of 0.12.
description: 14 pages, 4 figures, Journal of Physics Conference Series - Proceedings of the 19th Annual International Astrophysics Conference, Santa Fe, NM, March 9-13, 2020 (accepted)
Approximation Properties and Estimation of the Translog Production Function with Panel Data
Creators: name: Tzouvelekas, Evaggelos
name: Tzouvelekas, Evaggelos
Publisher: name: Unknown
Year: 2000
Subjects: Research Methods/ Statistical Methods

description: This paper provides a general theoretical and methodological framework for the estimation of the translog production function using panel data. The estimation is carried out using generalised least squares estimator (random-effects model) under different maintained hypotheses for the underlying production technology. Our empirical results indicate that imposing a priori restrictions such as homotheticity, homogeneity or separability on the production structure are not palatable and should rather remain a testable hypothesis within the estimation framework.
Weak Lensing Skew-Spectrum
Creators: name: Munshi, D.
name: Namikawa, T.
name: Kitching, T. D.
name: McEwen, J. D.
name: Bouchet, F. R.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We introduce the skew-spectrum statistic for weak lensing convergence $κ$ maps and test it against state-of-the-art high-resolution all-sky numerical simulations. We perform the analysis as a function of source redshift and smoothing angular scale for individual tomographic bins. We also analyse the cross-correlation between different tomographic bins. We compare the numerical results to fitting-functions used to model the bispectrum of the underlying density field as a function of redshift and scale. We derive a closed form expression for the skew-spectrum for gravity-induced secondary non-Gaussianity. We also compute the skew-spectrum for the projected $κ$ inferred from Cosmic Microwave Background (CMB) studies. As opposed to the low redshift case we find the post-Born corrections to be important in the modelling of the skew-spectrum for such studies. We show how the presence of a mask and noise can be incorporated in the estimation of a skew-spectrum.
description: 16 pages, 11 figures
Small zeros of quadratic forms over the algebraic closure of Q
Creators: name: Fukshansky, Lenny
Publisher: name: arXiv
Year: 2005
Subjects: subject: Number Theory (math.NT)
subject: FOS: Mathematics
subject: 11E12, 11G50, 11H55, 11D09

description: Let $N \geq 2$ be an integer, $F$ a quadratic form in $N$ variables over $\bar{\mathbb Q}$, and $Z \subseteq \bar{\mathbb Q}^N$ an $L$-dimensional subspace, $1 \leq L \leq N$. We prove the existence of a small-height maximal totally isotropic subspace of the bilinear space $(Z,F)$. This provides an analogue over $\bar{\mathbb Q}$ of a well-known theorem of Vaaler proved over number fields. We use our result to prove an effective version of Witt decomposition for a bilinear space over $\bar{\mathbb Q}$. We also include some related effective results on orthogonal decomposition and structure of isometries for a bilinear space over $\bar{\mathbb Q}$. This extends previous results of the author over number fields. All bounds on height are explicit.
description: 17 pages; revised version per referee's request, in particular section 6 has been largely expanded; to appear in the International Journal of Number Theory
Public Preferences, Statutory Regulations and Bargaining in Field Margin Provision for Ecological Main Structures
Creators: name: Nuppenau, Ernst-August
name: Nuppenau, Ernst-August
Publisher: name: Unknown
Year: 2000
Subjects: Political Economy

description: Political procedures aimed at solving conflicts are becoming popular in agri-environmental economics. They are considered as substitutes for market trans­ac­tions. Ecological lobbying groups put pressure on poli­ticians to enforce ecological main structures, while farmers oppose them. Undefined property rights pose problems and statutory regulations are discussed. The paper applies a political economy model of social bargaining to the provision of an ecological main structure. It shows how a tragedy of the commons problem may prevail. Then it outlines a social optimum of field margin provision. Finally, it provides a solution to the establishment of socially acceptable rules in a political economy framework. Also, a payment scheme is introduced.
The Weyl -- Wigner -- Moyal Formalism on a Discrete Phase Space. II. The Photon Wigner Function
Creators: name: Przanowski, Maciej
name: Tosiek, Jaromir
name: Turrubiates, Francisco J.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences
subject: 81S30

description: Classical model of light in helicity formalism is presented. Then quantum point of view at photons -- construction and interpretation of photon wave function is proposed. Quantum mechanics of photon is investigated. The Białynicki -- Birula scalar product $\langle {\bf Ψ}_{1}|{\bf Ψ}_{2}\rangle_{BB}$ and the generalized Hermitian conjugation $\widehatγ^{+\hspace{-0.45em}+}$ of linear operator $\widehatγ$ are discussed. Quantum description of light on a phase space is developed. A photon Wigner function is built.
description: 37 pages
The Effects of Mutual Fund Attributes on Mutual Fund Performance
Creators: name: Rahmani, Ali
Publisher: name: figshare
Year: 2020
Subjects: subject: 150103 Financial Accounting
subject: FOS: Economics and business

description: Mutual funds were first established in Iran in 2007 under Securities Market Act 2005 and have since grown significantly to one of the most important capital market intermediaries. Hence understanding and evaluating the performance of these funds are critical to both investors and fund managers. This research aims to examine the effects of various mutual fund attributes and characteristics, namely past performance, size, expenses ratio, turnover ratio, number of funds under fund manager’s management, and type of institution of fund founder, on their current performance. For this purpose, a sample of 43 equity mutual fund was chosen and relevant weekly data for the period of 22th June to 22th September 2013 was collected. The results show that only past performance and the type of institution of founder have an impact on the mutual fund's performance.
Low energy spin fluctuations in the heavy fermion compound Ce$_{0.925}$La$_{0.075}$Ru$_{2}$Si$_{2}$
Creators: name: Knafo, W.
name: Raymond, S.
name: Fåk, B.
name: Adams, M. A.
name: Lejay, P.
name: Flouquet, J.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We report inelastic neutron scattering measurements performed on a single crystal of the heavy fermion compound Ce$_{0.925}$La$_{0.075}$Ru$_{2}$Si$_{2}$, which is at the borderline between an antiferromagnetically ordered and a paramagnetic ground state. Intensity maps as a function of wavevector and energy ($0.1
description: 2 pages, 2 figures, SCES'04 Proceedings
A Dialectical Approach to Social Restructuring and Technical Change in Greek Agriculture
Creators: name: Liodakis, George
name: Liodakis, George
Publisher: name: Unknown
Year: 2000
Subjects: Political Economy

description: This paper investigates the dialectic between social restructuring and technical change within the transition to capitalism in Greek agriculture. Contrary to neo-populist interpretations, it is argued that capitalism has developed considerably, and that technical change has played a major role in the process of class differentiation and capitalist development. While the new capitalist strategy for agricultural restructuring has reinforced the process of concentration and capitalist development, with a devastating impact on small farmers, it is argued that the social conflicts involved and the recent agrarian mobilisations tend to form an alternative strategy for the semi-proletarianised 'working class', negating both neo-populism and capitalist modernisation.
An Empirical Evaluation of EU and National Structural Policies in Remote Rural Areas: The Case of Evrytania
Creators: name: Psaltopoulos, Demetrios
name: Efstratoglou, Sophia
name: Psaltopoulos, Demetrios
name: Efstratoglou, Sophia
Publisher: name: Unknown
Year: 2000
Subjects: Community/Rural/Urban Development
Political Economy

description: This paper presents an empirical investigation into the effects of European Union structural policy funding in the poor, remote, rural area of Evrytania in Greece. First, the socio-economic profile of the area is presented, followed by a detailed description of structural policy intervention in the study area during 1989-93 period (first Community Support Framework). Subsequently, a regional Social Accounting Matrix (SAM) is used to portray the structural characteristics of the local economy, followed by the estimation of the economic impacts of policy expenditures during the first period of structural funding after the 1988 reforms. Results indicate that the local economy is characterised by a low level of development, lack of integration and generally traditional structures. Moreover, the economic impacts of structural policy expenditure were found to be very significant, especially in terms of employment and firm income generation, representing thus, a valuable effort for the promotion of the area's development.
Mapping spacetimes with LISA: inspiral of a test-body in a `quasi-Kerr' field
Creators: name: Glampedakis, Kostas
name: Babak, Stanislav
Publisher: name: arXiv
Year: 2005
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The future LISA detector will constitute the prime instrument for high-precision gravitational wave observations.LISA is expected to provide information for the properties of spacetime in the vicinity of massive black holes which reside in galactic nuclei.Such black holes can capture stellar-mass compact objects, which afterwards slowly inspiral,radiating gravitational waves.The body's orbital motion and the associated waveform carry information about the spacetime metric of the massive black hole,and it is possible to extract this information and experimentally identify (or not!) a Kerr black hole.In this paper we lay the foundations for a practical `spacetime-mapping' framework. Our work is based on the assumption that the massive body is not necessarily a Kerr black hole, and that the vacuum exterior spacetime is stationary axisymmetric,described by a metric which deviates slightly from the Kerr metric. We first provide a simple recipe for building such a `quasi-Kerr' metric by adding to the Kerr metric the deviation in the value of the quadrupole moment. We then study geodesic motion in this metric,focusing on equatorial orbits. We proceed by computing `kludge' waveforms which we compare with their Kerr counterparts. We find that a modest deviation from the Kerr metric is sufficient for producing a significant mismatch between the waveforms, provided we fix the orbital parameters. This result suggests that an attempt to use Kerr waveform templates for studying EMRIs around a non-Kerr object might result in serious loss of signal-to-noise ratio and total number of detected events. The waveform comparisons also unveil a `confusion' problem, that is the possibility of matching a true non-Kerr waveform with a Kerr template of different orbital parameters.
description: 19 pages, 6 figures
Nursing Home Staff Networks and COVID-19
Creators: name: Chen, M. Keith
name: Chevalier, Judith A.
name: Long, Elisa F.
Publisher: name: arXiv
Year: 2020
Subjects: subject: General Economics (econ.GN)
subject: Physics and Society (physics.soc-ph)
subject: FOS: Economics and business
subject: FOS: Physical sciences
subject: 91C99

description: Nursing homes and other long term-care facilities account for a disproportionate share of COVID-19 cases and fatalities worldwide. Outbreaks in U.S. nursing homes have persisted despite nationwide visitor restrictions beginning in mid-March. An early report issued by the Centers for Disease Control and Prevention identified staff members working in multiple nursing homes as a likely source of spread from the Life Care Center in Kirkland, Washington to other skilled nursing facilities. The full extent of staff connections between nursing homes---and the crucial role these connections serve in spreading a highly contagious respiratory infection---is currently unknown given the lack of centralized data on cross-facility nursing home employment. In this paper, we perform the first large-scale analysis of nursing home connections via shared staff using device-level geolocation data from 30 million smartphones, and find that 7 percent of smartphones appearing in a nursing home also appeared in at least one other facility---even after visitor restrictions were imposed. We construct network measures of nursing home connectedness and estimate that nursing homes have, on average, connections with 15 other facilities. Controlling for demographic and other factors, a home's staff-network connections and its centrality within the greater network strongly predict COVID-19 cases. Traditional federal regulatory metrics of nursing home quality are unimportant in predicting outbreaks, consistent with recent research. Results suggest that eliminating staff linkages between nursing homes could reduce COVID-19 infections in nursing homes by 44 percent.
description: 22 pages, 2 figures. This working paper updated July 22nd, 2020. For the most recent version, see https://www.anderson.ucla.edu/faculty_pages/keith.chen/papers/WP_Nursing_Home_Networks_and_COVID19.pdf
Production, Consumption and Welfare Implications of Trade Liberalisation: The Case of Greek Agriculture
Creators: name: Stoforos, Chrysostomos E.
name: Stoforos, Chrysostomos E.
Publisher: name: Unknown
Year: 2003
Subjects: International Relations/Trade

description: The main facts lying behind this paper are related to the current issues regarding EU policies; such as the accession of a number of Central and Eastern European Countries (CEECs) in the EU and the Doha round of the World Trade Organisation. The adopted quantitative methodology aims to estimate the expected trends in Greek agriculture following a substantial reduction in the level of protection over the 1999-2008 period. Two scenarios are examined: a baseline that simulates continuation of present agricultural policies, and one that assumes trade liberalisation. Trade liberalization has as an immediate negative effect on production, while a positive effect is true for demand. Welfare analysis results suggest a significant negative effect in producer surplus, but an overall positive trend for the net welfare effect in the case of the trade liberalisation scenario. Hence, from the efficiency point of view, the reallocation of resources through trade liberalisation is beneficial, if proper strategies are adopted to avoid additional costs due to market imperfections.
Generalizations of the Familywise Error Rate
Creators: name: Lehmann, E. L.
name: Romano, Joseph P.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Statistics Theory (math.ST)
subject: FOS: Mathematics
subject: 62J15 (Primary) 62G10. (Secondary)

description: Consider the problem of simultaneously testing null hypotheses H_1,...,H_s. The usual approach to dealing with the multiplicity problem is to restrict attention to procedures that control the familywise error rate (FWER), the probability of even one false rejection. In many applications, particularly if s is large, one might be willing to tolerate more than one false rejection provided the number of such cases is controlled, thereby increasing the ability of the procedure to detect false null hypotheses. This suggests replacing control of the FWER by controlling the probability of k or more false rejections, which we call the k-FWER. We derive both single-step and stepdown procedures that control the k-FWER, without making any assumptions concerning the dependence structure of the p-values of the individual tests. In particular, we derive a stepdown procedure that is quite simple to apply, and prove that it cannot be improved without violation of control of the k-FWER. We also consider the false discovery proportion (FDP) defined by the number of false rejections divided by the total number of rejections (defined to be 0 if there are no rejections). The false discovery rate proposed by Benjamini and Hochberg [J. Roy. Statist. Soc. Ser. B 57 (1995) 289-300] controls E(FDP). Here, we construct methods such that, for any γand α, P{FDP>γ}\leα. Two stepdown methods are proposed. The first holds under mild conditions on the dependence structure of p-values, while the second is more conservative but holds without any dependence assumptions.
description: Published at http://dx.doi.org/10.1214/009053605000000084 in the Annals of Statistics (http://www.imstat.org/aos/) by the Institute of Mathematical Statistics (http://www.imstat.org)
[Letter from Anna Antoinette Weber van Bosse]
Creators: name: Weber Van Bosse, Anna Antoinette
Publisher: name: Unknown
Year: 1903

description: Has sent a box containing Lithothamnia. It also contains a specimen of Corallina pilifera and a slide of the same alga. On this algae there seems to be a parasitic Melobesia resembling M. thuretii = Choreonema thuretii. Is returning the list. Is going to place the algae from 1888-1889 collected by herself and those collected by Dr. Boerlage and Mr. [Snackey] in the Siboga collection. Asks Foslie to return the slides of fossil Lithothamnia belonging to Professor Martin.
Search bounds for zeros of polynomials over the algebraic closure of Q
Creators: name: Fukshansky, Lenny
Publisher: name: arXiv
Year: 2005
Subjects: subject: Number Theory (math.NT)
subject: FOS: Mathematics
subject: 11G50, 11E76, 11D72, 14G40

description: We discuss existence of explicit search bounds for zeros of polynomials with coefficients in a number field. Our main result is a theorem about the existence of polynomial zeros of small height over the field of algebraic numbers outside of unions of subspaces. All bounds on the height are explicit.
description: 10 pages, revised version: to appear in Rocky Mountain Journal of Mathematics; minor editorial revisions, removed section 5 for brevity of exposition
Investigating Effects of Growth and Conservatism on Bias of ROI Compared with Internal Rate of Return
Creators: name: Rahmani, Ali
Publisher: name: figshare
Year: 2020
Subjects: subject: 150103 Financial Accounting
subject: FOS: Economics and business

description: The Return on Investment (ROI) is widely regarded as a key measure of firm’s performance. The literature has recognized, mostly, that ROI will not reflect economic profitability. This study takes behavior of ROI as a function of two variables: past growth and accounting conservatism. The studied sample consists of 61 firms listed in the Tehran Stock Exchange, in which the required data for a 5-year-period of 1386-1390 was available. In this study the growth of investment refers to the growth of expenses for advertising and R&D, and conservatism means unconditional conservatism from direct transfer of these expenses to expenditure account. The growth of investment, which may stand at a level higher or lower than a critical value, measured by internal rate of return, may be regarded as moderate or excessive. The hypotheses were tested by the regression model of panel data. The findings showed that in case of conservative accounting, higher growth results in lower level of ROI. Conversely, in case of more conservative accounting, the ROI will increase, provided that new investments grow moderately over the relevant time horizon.
Spatial developments of EU agriculture in the post-war period: The case of wheat and tobacco
Creators: name: Elhorst, J. Paul
name: Strijker, Dirk
name: Elhorst, J. Paul
name: Strijker, Dirk
Publisher: name: Unknown
Year: 2003
Subjects: Production Economics

description: This article analyses the intertemporal development of the regional and spatial distribution of agricultural production in the territory of the EC-9. The analysis is based on a unique set of data: the analysed territory has been divided into 88 regions and data from these regions over a period of more than 40 years (1950/53-1993/96) are used. Different methods are applied to analyse the developments: maps and the skewness of distribution (coefficient of Gini) are combined with rank correlation (coefficient of Spearman), the calculation of the centre of gravity, and spatial autocorrelation (Moran's I). These methods are applied to two crops, wheat and tobacco. The results of the analyses of wheat cultivation indicate that the regional concentration has remained more or less unchanged, while the spatial concentration has decreased considerably. The centre of gravity has moved 600 km to the north-west. The research results for tobacco cultivation show an increasing regional concentration, combined with a stable or decreasing spatial concentration. The centre of gravity has moved 600 km to the south-east.
Donceel-Voûte, Pauline: Les pavements des églises byzantines de Syrie et du Liban
Creators: name: Kaufhold, Hubert
Publisher: name: Oriens christianus : Hefte für die Kunde des christlichen Orients
Year: 2024

description: Oriens christianus : Hefte für die Kunde des christlichen Orients, Bd. 80 (1996): Oriens christianus, Band 80
The Impact of the agricultural sector on cyclical unemployment and output in EU
Creators: name: Lawler, K.
name: Katsouli, E.
name: Pallis, D.
name: Lawler, K.
name: Katsouli, E.
name: Pallis, D.
Publisher: name: Unknown
Year: 2003
Subjects: Labor and Human Capital

description: The purpose of this paper was to estimate changes in cyclical unemployment and output in the EU using an Okun's law equation, extended with a new variable, namely, the share of the economically active labour force of the agricultural sector in the total economy. Treating both the NAIRU and the potential output growth rate as time dependent unobserved stochastic processes, a state-space maximum likelihood estimation method - using Kalman filter where the state variables were random walks - was followed in order to estimate the 15 equations. Overall, the estimated equations suggested that the extent and direction of changes of cyclical unemployment and cyclical output over the period 1961-1999 is mixed across the EU. The paper concludes that the introduction of the share of the agricultural labour force in the determination of cyclical unemployment and output is important and therefore the application of "common agricultural policies" across the 15 EU member states may be questionable because of the different expected effects of these policies on the various economies.
Momentum and pressure balance of a comet ionosphere
Creators: name: Williamson, Hayley
name: Nilsson, Hans
name: Wieser, Gabriella Stenberg
name: Eriksson, A. I.
name: Richter, Ingo
name: Goetz, Charlotte
Publisher: name: arXiv
Year: 2020
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Space Physics (physics.space-ph)
subject: FOS: Physical sciences

description: We calculate the momentum flux and pressure of ions measured by the Ion Composition Analyzer (ICA) on the Rosetta mission at comet 67P/Churyumov-Gerasimenko. The total momentum flux stays roughly constant over the mission, but the contributions of different ion populations change depending on heliocentric distance. The magnetic pressure, calculated from Rosetta magnetometer measurements, roughly corresponds with the cometary ion momentum flux. When the spacecraft enters the solar wind ion cavity, the solar wind fluxes drop drastically, while the cometary momentum flux becomes roughly ten times the solar wind fluxes outside of the ion cavity, indicating that pickup ions behave similarly to the solar wind ions in this region. We use electron density from the Langmuir probe to calculate the electron pressure, which is particularly important close to the comet nucleus where flow changes from antisunward to radially outward.
description: 14 pages, 2 figures, accepted to Geophysical Review Letters
Detection of thermal X-ray emission in the halo of the plerionic supernova remnant G21.5-0.9
Creators: name: Bocchino, F.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The detection of a soft thermal X-ray component in the spectrum of a bright knot in the halo of the plerion G21.5-0.9 is reported. Using a collisional ionization equilibrium model for an hot optically thin plasma, a temperature $kT=0.12-0.24$ kev, a mass of 0.3--1.0 M$_\odot$ and a density of 1.6-6 cm$^{-3}$ is derived. The spectral analysis suggests a possible overabundance of Silicon with respect to the solar value in the knot; if this will be confirmed this object may be a clump of shocked ejecta.
description: 6 pages, 4 figures, Adv.Sp.Res. in press, proc of COSPAR Session E1.4 "Young Neutron Stars and Supernova Remnants", http://www.astropa.unipa.it/Library/OAPA_preprints/ns.ps.gz
Spin relaxation under identical Dresselhaus and Rashba coupling strengths in GaAs quantum wells
Creators: name: Cheng, J. L.
name: Wu, M. W.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: Spin relaxation under identical Dresselhaus and Rashba coupling strengths in GaAs quantum wells is studied in both the traditional collinear statistics, where the energy spectra do not contain the spin-orbit coupling terms, and the helix statistics, where the spin-orbit couplings are included in the energy spectra. We show that there is only marginal difference between the spin relaxation times obtained from these two different statistics. We further show that with the cubic term of the Dresselhaus spin-orbit coupling included, the spin relaxation time along the (1,1,0) direction becomes finite, although it is still much longer than that along the other two perpendicular directions. The properties of the spin relaxation along this special direction under varies conditions are studied in detail.
description: 9 pages, 4 figures. J. Appl. Phys. 99, 2006 (in press)
Exchange interaction in quantum rings and wires in the Wigner-crystal limit
Creators: name: Fogler, Michael M.
name: Pivovarov, Eugene
Publisher: name: arXiv
Year: 2005
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We present a controlled method for computing the exchange coupling in correlated one-dimensional electron systems based on the relation between the exchange constant and the pair-correlation function of spinless electrons. This relation is valid in several independent asymptotic regimes, including low electron density case, under the general condition of a strong spin-charge separation. Explicit formulas for the exchange constant are obtained for thin quantum rings and wires with realistic Coulomb interactions by calculating the pair-correlation function via a many-body instanton approach. A remarkably smooth interpolation between high and low electron density results is shown to be possible. These results are applicable to the case of one-dimensional wires of intermediate width as well. Our method can be easily generalized to other interaction laws, such as the inverse distance squared one of the Calogero-Sutherland-Moser model. We demonstrate excellent agreement with the known exact results for the latter model and show that they are relevant for a realistic experimental setup in which the bare Coulomb interaction is screened by an edge of a two-dimensional electron gas.
description: 12 pages, 5 figures
The Agricultural Sector in the Macroeconomic Environment: An Empirical Approach for EU
Creators: name: Dritsakis, Nikolaos
name: Dritsakis, Nikolaos
Publisher: name: Unknown
Year: 2003
Subjects: Demand and Price Analysis

description: This paper attempts to examine the relationship between the agricultural sector and the macroeconomic environment with a special mention in the way of prices formation in the agricultural sector. In the empirical analysis of this study a multivariate cointegration technique is applied in conjunction with Granger causality tests. The results of this analysis provide indications for the existence of significant causal relationships between the variables that characterize the macroeconomic environment and the indicators of the agricultural sector.
An exploration of the factor structures of the Short Parallel Assessments of Neuropsychological Status (SPANS) in two independent samples
Creators: name: Lee, Edith Y.
Publisher: name: University of Leicester
Year: 2021
Subjects: Uncategorized

description: Literature ReviewThe literature review explored the factor structures of the RBANS reported in existing literature. With the systematic search of four databases, 11 quantitative papers were identified as relevant and included in this review. Six reported two-factor solutions, two suggested five-factor solutions, one found three-factor model, one demonstrated bi-factor model and the other one reported second-order factor model. Research to date showed that limited empirical support to the original RBANS structure has been found and there was little consensus regarding the factor structure of the RBANS. Given the important role that neuropsychological measures play in the neuro-rehabilitation services, this should be privileged in future research.Empirical Research ProjectThe foremost aim of neuropsychological assessment is usually multifaceted and aims to aid clinicians in making clinical decisions about clients by utilising neuropsychological test batteries to identify the cognitive strengths and impairments of the clients. The present study aimed to explore the latent constructs of the SPANS in two independent samples: non-clinical (n=393) and clinical (n=121). Principal axis EFA was conducted to analyse the common variance from the SPANS subtests and two three-factor solutions were derived respectively from the non-clinical and clinical samples with different factors emergent. The three factors derived from the non-clinical sample comprise: Visual, learning and memory retention of the newly learned information, recognition memory, and general knowledge and attention and working memory. The three factors emerged from the clinical sample consist of: Visuo-motor and efficiency, receptive and expressive language, and learning and retention. The findings had a few clinical implications, limitations of the study and future research ideas were discussed.
Spatially dispersing Yu-Shiba-Rusinov states in the unconventional superconductor $\mathrm{FeTe}_{0.55}\mathrm{Se}_{0.45}$
Creators: name: Chatzopoulos, Damianos
name: Cho, Doohee
name: Bastiaans, Koen M.
name: Steffensen, Gorm O.
name: Bouwmeester, Damian
name: Akbari, Alireza
name: Gu, Genda
name: Paaske, Jens
name: Andersen, Brian M.
name: Allan, Milan P.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: By using scanning tunneling microscopy (STM) we find and characterize dispersive, energy-symmetric in-gap states in the iron-based superconductor $\mathrm{FeTe}_{0.55}\mathrm{Se}_{0.45}$, a material that exhibits signatures of topological superconductivity, and Majorana bound states at vortex cores or at impurity locations. We use a superconducting STM tip for enhanced energy resolution, which enables us to show that impurity states can be tuned through the Fermi level with varying tip-sample distance. We find that the impurity state is of the Yu-Shiba-Rusinov (YSR) type, and argue that the energy shift is caused by the low superfluid density in $\mathrm{FeTe}_{0.55}\mathrm{Se}_{0.45}$, which allows the electric field of the tip to slightly penetrate the sample. We model the newly introduced tip-gating scenario within the single-impurity Anderson model and find good agreement to the experimental data.
Magnetoconductivity of Hubbard bands induced in Silicon MOSFETs
Creators: name: Ferrus, T.
name: George, R.
name: Barnes, C. H. W.
name: Lumpkin, N.
name: Paul, D. J.
name: Pepper, M.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Sodium impurities are diffused electrically to the oxide-semiconductor interface of a silicon MOSFET to create an impurity band. At low temperature and at low electron density, the band is split into an upper and a lower sections under the influence of Coulomb interactions. We used magnetoconductivity measurements to provide evidence for the existence of Hubbard bands and determine the nature of the states in each band.
description: In press in Physica B
Broad Band Single Germanium Nanowire Photodetectors with Surface Oxide Controlled High Optical Gain
Creators: name: Sett, Shaili
name: Ghatak, Ankita
name: Sharma, Deepak
name: Kumar, G. V. Pavan
name: Raychaudhuri, A. K.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Applied Physics (physics.app-ph)
subject: Instrumentation and Detectors (physics.ins-det)
subject: FOS: Physical sciences

description: We have investigated photoconductive properties of single Germanium Nanowires(NWs)of diameter less than 100 nm in the spectral range of 300 to 1100 nm showing ultra large peak Responsivity in excess of 10^{7}AW^{-1}.The NWs were grown by Vapor Liquid Solid method using Au nanoparticle as catalyst. In this report we discuss the likely origin of the ultra large responsivity that may arise from a combination of various physical effects which are a): Ge and GeO_{x} interface states which act as scavengers of electrons from the photo-generated pairs,leaving the holes free to reach the electrodes,b) Schottky barrier at the metal and NW interface which gets lowered substantially due to carrier diffusion in contact region and (c) photodetector length being small (approximately few μm), negligible loss of photogenerated carriers due to recombination at defect sites. We have observed from power dependence of the optical gain that the gain is controlled by trap states. We find that the surface of the nanowire has presence of a thin layer of GeO_{x} (as evidenced from HRTEM study) which provide interface states. It is observed that these state play a crucial role to provide a radial field for separation of photogenerated electron and hole pair which in turn leads to very high effective photoconductive gain that reaches a very high at low illumination density.
description: 32 pages
[Letter from Carl Fredrik Otto Nordstedt]
Creators: name: Nordstedt, Carl Fredrik Otto
Publisher: name: Unknown
Year: 1903
Subjects: Lagerheim, Nils Gustaf

description: Has sent the last Fasc. of algae exc., and no more will be published. Lagerheim is probably going to publish another algae exc. Expresses gratitude for all help and for all the slides received.
JETIR= My Paper.pdf
Creators: name: LAKHINANDAN BORA
Publisher: name: figshare
Year: 2020
Subjects: History

description: "LABOUR PROCESS AND SOCIAL FORMATION IN PRE-COLONIAL ASSAM"Author-LAKHINANDAN BORAResearch ScholarDepartment of HistoryDibrugarh UniversityDibrugarh, Assam, IndiaPublished in-Journal of Emerging Technologies and Innovative Research (JETIR)ISSN: 2349-5162
www.jetir.org
Issue-May 2019, Volume 6, Issue 5
Radiative leptogenesis in minimal seesaw models
Creators: name: Joaquim, F. R.
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: In the framework of seesaw models with only two heavy Majorana neutrinos, nonzero leptonic asymmetries can be radiatively generated when exact heavy neutrino mass degeneracy ($M_1=M_2=M$) is imposed at a scale $Λ_D > M$. For a specific case, we show that an acceptable value for the baryon asymmetry of the Universe can be obtained considering thermal leptogenesis.
description: Talk given at NOW 2004: Neutrino Oscillation Workshop, Conca Specchiulla, Otranto, Italy, 11-17 Sep 2004