cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Conjugated Schiff-base macrocycles and their metal complexes
Creators: name: Hui, Joseph
Publisher: name: University of British Columbia
Year: 2009

description: The [3+3] Schiff-base macrocycles (37-40) were obtained by reacting 3,6- diformyl-l,2-dihydroxybenzene (31) and 4,5-diamino-l,2-dialkoxybenzene (33-36). The resulting macrocycles were characterized by ¹H and ¹³C NMR spectroscopy, IR spectroscopy, UV-Vis spectroscopy, ESI mass spectrometry, DSC and POM. The macrocycles with long alkoxy substituents have the potential to exhibit liquid crystallinity; however, no mesomorphic characteristics were observed. Macrocycle 37 was metallated with most of the first-row transition metals. The metal-containing [3+3] Schiff-base macrocycles (47-53) were characterized by ¹H NMR spectroscopy, IR spectroscopy, UV-Vis spectroscopy, and ESI and MALDI-TOF mass spectrometry. ESR spectroscopy has been performed on the vanadyl-containing macrocycle 47. The ESR spectrum shows that there appears to be a significant interaction between the unpaired electrons of the vanadium atoms, leading to a single broad ESR signal. Several attempts have been made to obtain the [6+6] Schiff-base macrocycle, but only a fragment of it (compound 65) could be synthesized successfully.
title: The factors that impact on director’s decision-making behaviour at the board level
Creators: name: Islam, Muhammad Mominul
Publisher: name: University of Reading
Year: 2022

description: This research study pursues the impact of directors’ behaviour on board-level decision-making. The data were collected through elite interviews with 27 board members, which 
consisted of chairpersons, CEOs, executive directors, and non-executive directors. These 
interviews were semi-structured with open-ended questions, and the data collected was then 
thematically analysed in order to identify themes. Each of these themes was followed by 
several sub-themes that emerged from the analysis. The analysis process of the research 
was inductive, where codes were extracted from the data, and then codes formed sub-themes which eventually led to forming themes. Seven key themes emerged from the 
analysis, skills and experience; CEO-Chair roles and relations; conflict resolution and board 
dynamics; information, communication and engagement; professional and personal 
backgrounds; gender and technology and managing situations beyond our control. 
The research made an in-depth examination of director attributes, board members'
interaction, engagement, conflict, board dynamics through directors’ behaviour and the effect 
on board decision-making. The research findings suggest that a number of factors impact 
directors’ behaviour, which is one of the key components in board-level decision-making. 
Directors’ behaviour is deeply associated with the above-mentioned themes, and so directors’
behaviour can impact board decision-making and hence organisational outcomes. So, the 
directors’ behaviour is regarded as one of the keys to an organisation’s success, which recent 
research has failed to shed light on, which is why the findings of the research are so 
significant for both literature and practice.
Pion form factor with twisted mass QCD
Creators: name: Abdel-Rehim, Abdou M.
name: Lewis, Randy
Publisher: name: arXiv
Year: 2004
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: The pion form factor is calculated using quenched twisted mass QCD with beta=6.0 and maximal twisting angle omega=pi/2. Two pion masses and several values of momentum transfer are considered. The momentum averaging procedure of Frezzotti and Rossi is used to reduce lattice spacing errors, and numerical results are consistent with the expected O(a) improvement.
description: Talk presented at Lattice2004(spectrum), 3 pages, one reference added and one typo fixed
Millimeter Wave Remove UAV Control and Communications for Public Safety Scenarios
Creators: name: Xia, William
name: Polese, Michele
name: Mezzavilla, Marco
name: Loianno, Giuseppe
name: Rangan, Sundeep
name: Zorzi, Michele
Publisher: name: arXiv
Year: 2020
Subjects: subject: Signal Processing (eess.SP)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Communication and video capture from unmanned aerial vehicles (UAVs) offer significant potential for assisting first responders in remote public safety settings. In such uses, millimeter wave (mmWave) wireless links can provide high throughput and low latency connectivity between the UAV and a remote command center. However, maintaining reliable aerial communication in the mmWave bands is challenging due to the need to support high speed beam tracking and overcome blockage. This paper provides a simulation study aimed at assessing the feasibility of public safety UAV connectivity through a 5G link at 28 GHz. Real flight motion traces are captured during maneuvers similar to those expected in public safety settings. The motions traces are then incorporated into a detailed mmWave network simulator that models the channel, blockage, beamforming and full 3GPP protocol stack. We show that 5G mmWave communications can deliver throughput up to 1 Gbps with consistent sub ms latency when the base station is located near the mission area, enabling remote offloading of the UAV control and perception algorithms.
description: 2019 16th Annual IEEE International Conference on Sensing, Communication, and Networking (SECON)
A linear theory for control of non-linear stochastic systems
Creators: name: Kappen, H. J.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Computational Physics (physics.comp-ph)
subject: General Physics (physics.gen-ph)
subject: FOS: Physical sciences

description: We address the role of noise and the issue of efficient computation in stochastic optimal control problems. We consider a class of non-linear control problems that can be formulated as a path integral and where the noise plays the role of temperature. The path integral displays symmetry breaking and there exist a critical noise value that separates regimes where optimal control yields qualitatively different solutions. The path integral can be computed efficiently by Monte Carlo integration or by Laplace approximation, and can therefore be used to solve high dimensional stochastic control problems.
description: 5 pages, 3 figures. Accepted to PRL
The Intersection of Economic Trade Sanctions and National Security Interests in an Increasingly Bellicose World.
Creators: name: Malkawi, Bashar H.
Publisher: name: figshare
Year: 2024
Subjects: classificationCode: 480302
subject: Comparative law

description: This article compares and contrasts the scope and interpretations of the WTO national security exception found under Article XXI of the GATT 1994, with similar national security exception provisions found in several key regional Free Trade Agreements (FTAs). The paper then provides an overview of the recent expansion of economic trade sanctions regimes, especially key sanctions programs imposed against trading partners by the United States and European Union during the past 5 years and analyzes those sanctions in light of the scope and interpretation of foregoing WTO and FTA national security exceptions.
ViscNet: Neural network for predicting the fragility index and the temperature-dependency of viscosity
Creators: name: Cassar, Daniel R.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Computational Physics (physics.comp-ph)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: Viscosity ($η$) is one of the most important properties of disordered matter. The temperature-dependence of viscosity is used to adjust process variables for glass-making, from melting to annealing. The aim of this work was to develop a physics-informed machine learning model capable of predicting $η(T)$ of oxide liquids. Instead of predicting the viscosity itself, the NN predicts the parameters of the MYEGA viscosity equation: the liquid's fragility index, the glass transition temperature, and the asymptotic viscosity. With these parameters, $η$ can be computed at any temperature of interest, with the advantage of good extrapolation capabilities inherent to the MYEGA equation. The dataset was collected from the SciGlass database; only oxide liquids with enough data points in the high and low viscosity regions were selected, resulting in a final dataset with 17,584 data points containing 847 different liquids. About 600 features were engineered from the liquids' chemical composition and 35 of these features were selected using a feature selection protocol. The hyperparameter (HP) tuning of the NN was performed in a set of experiments using both random search and Bayesian strategies, where a total of 700 HP sets were tested. The most successful HP sets were further tested using 10-fold cross-validation, and the one with the lowest average validation loss was selected as the best set. The final trained NN was tested with a test dataset of 85 liquids with different compositions than those used for training and validating the NN. The $R^2$ for the test dataset's prediction was 0.97. This work introduces three advantages: the model can predict viscosity as well as the liquids' glass transition temperature and fragility index; the model is designed and trained with a focus on extrapolation; finally, the model is available as free and open-source software licensed under the GPL3.
description: 31 pages, 27 figures. Layout change. Added journal reference
Molecular dynamics simulations of alkali halide clusters
Creators: name: Croteau, Timothʹe
Publisher: name: University of British Columbia
Year: 2009

description: An investigation of the melting, freezing and structure of pure LiCl, KC1 and mixed LiCl-KCl clusters is presented. The results of molecular dynamics simulations of unconstrained neutral clusters with 6, 8, 10, 32, 64, 216, 512, and 1000 ions have been carried out using the Born-Mayer-Huggins potential based on a rigid ion (non-polarizable) approximation. Initial molecular dynamics studies of phase transitions in clusters of alkali halides have shown some very interesting characteristics, especially in the case of large size asymmetry where the ionic radii ratio, r+/r_ < 0.5. A comparison of the structures of KC1 and LiCl clusters coupled with the calculation of the mean square displacement and distribution of the ions about the center of mass allows us to discuss the relevance of size asymmetry effects on the melting temperature, and on the stability of different isomeric structures. The main conclusion regarding pure LiCl clusters is that the behaviour of the LiCl pairs is greatly influenced by their strong dipolar character. This is shown by the clear competition between ring-like and cubic structures. For LiCl clusters, the strong dipolar character favours the formation of less ordered expanded ring structures explaining the absence of a sharp melting transition. At the solid-liquid transition, the energies associated with the liquid and solid structures are very similar possibly explaining the early melting of LiCl when compared with the other alkali halide salts. The study of binary mixtures shows that the structures are insensitive t.o LiCl concentration for a broad range of composition. The cubic character of KC1 clusters tends to dominate over the strong dipolar character of LiCl clusters which creates a separation or segregation of the species. Specifically, ion segregation effects give rise to a cubic portion in the structure of clusters with a LiCl mole fraction as high as 0.333, whereas ring geometries only start to appear when the KC1 mole fraction is reduced to 0.093. Moreover, it is only when the mole fraction of either KC1 or LiCl has reached 0.95 that the properties of the pure cluster are observed.
Structure and rheological properties of soft-hard nanocomposites: Influence of aggregation and interfacial modification
Creators: name: Oberdisse, Julian
name: Harrak, Abdeslam El
name: Carrot, Geraldine
name: Jestin, Jacques
name: Boue, Francois
Publisher: name: arXiv
Year: 2004
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: A study of the reinforcement effect of a soft polymer matrix by hard nanometric filler particles is presented. In the main part of this article, the structure of the silica filler in the matrix is studied by Small Angle Neutron Scattering (SANS), and stress-strain isotherms are measured to characterize the rheological properties of the composites. Our analysis allows us to quantify the degree of aggregation of the silica in the matrix, which is studied as a function of pH (4-10), silica volume fraction (3-15%) and silica bead size (average radius 78 A and 96 A). Rheological properties of the samples are represented in terms of the strain-dependent reinforcement factor, which highlights the contribution of the filler. Combining the structural information with a quantitative analysis of the reinforcement factor, the aggregate size and compacity (10%-40%) as a function of volume fraction and pH can be deduced. In a second, more explorative study, the grafting of polymer chains on nanosilica beads for future reinforcement applications is followed by SANS. The structure of the silica and the polymer are measured separately by contrast variation, using deuterated material. The aggregation of the silica beads in solution is found to decrease during polymerization, reaching a rather low final aggregation number (less than ten).
description: 17/12/2004
Theoretical frameworks for a productivity and efficiency analysis of agricultural enterprises
Creators: name: Lissitsa, Alexej
name: Babitcheva, Tamara
name: Lissitsa, Alexej
name: Babitcheva, Tamara
Publisher: name: Unknown
Year: 2003
Subjects: subject: Agribusiness
subject: Industrial Organization
subject: Productivity Analysis
subject: Research Methods/ Statistical Methods
subject: Produktivität
subject: Effizienz
subject: Indexzahlentheorie
subject: Malmquist
subject: Törnkvist
subject: Fisher Index
subject: Productivity
subject: Efficiency
subject: Index Number Theory
subject: Продуктивность
subject: эффективность
subject: теория индексов
subject: Малмквист
subject: Торнквист и Фишер индексы.

description: Das Hauptziel des vorliegenden "Discussions Paper" ist es, den russischsprachigen Leser mit den theoretischen Grundlagen der Produktivitäts- und Effizienzanalyse der landwirtschaftlichen Unternehmen vertraut zu machen. In der russischsprachigen Literatur wurden und werden bis zu heutigem Zeitpunkt in der Regel bei der Analyse der Effizienz der Unternehmen, die Kennzahlen der Rentabilität verwendet, deren Bedeutungen nach den einzelnen Unternehmen oder ihren Gruppen verglichen werden. In dieser Arbeit erfolgt eine Darstellung der im englischsprachigem Raum weitverbreiteten Methoden zur Effizienz und Produktivitätsanalyse. Die Arbeit ist so aufgebaut, dass zuerst die Unterschiede zwischen der Produktivität und Effizienz aus theoretischen Sicht erklärt und anschließend die wichtigsten Methoden der Produktivitäts- und Effizienzmessung dargestellt werden. Dabei gehen die Autoren insbesondere auf Malmquist, Törnkvist und Fisher Indexe ein.
Site characterization at downhole arrays by joint inversion of dispersion data and acceleration time series
Creators: name: Seylabi, Elnaz
name: Stuart, Andrew
name: Asimaki, Domniki
Publisher: name: arXiv
Year: 2020
Subjects: subject: Geophysics (physics.geo-ph)
subject: FOS: Physical sciences

description: We present a sequential data assimilation algorithm based on the ensemble Kalman inversion to estimate the near-surface shear wave velocity profile and damping when heterogeneous data and a priori information that can be represented in forms of (physical) equality and inequality constraints in the inverse problem are available. Although non-invasive methods, such as surface wave testing, are efficient and cost effective methods for inferring Vs profile, one should acknowledge that site characterization using inverse analyses can yield erroneous results associated with the inverse problem non-uniqueness. One viable solution to alleviate the inverse problem ill-posedness is to enrich the prior knowledge and/or the data space with complementary observations. In the case of non-invasive methods, the pertinent data are the dispersion curve of surface waves, typically resolved by means of active source methods at high frequencies and passive methods at low frequencies. To improve the inverse problem well-posedness, horizontal to vertical spectral ratio (HVSR) data are commonly used jointly with the dispersion data in the inversion. In this paper, we show that the joint inversion of dispersion and strong motion downhole array data can also reduce the margins of uncertainty in the Vs profile estimation. This is because acceleration time-series recorded at downhole arrays include both body and surface waves and therefore can enrich the observational data space in the inverse problem setting. We also show how the proposed algorithm can be modified to systematically incorporate physical constraints that further enhance its well-posedness. We use both synthetic and real data to examine the performance of the proposed framework in estimation of Vs profile and damping at the Garner Valley downhole array, and compare them against the Vs estimations in previous studies.
Influencing factors of profit and profitability of agricultural large firms in the Omsk region, Russia
Creators: name: Schulze, Eberhard
name: Tillack, Peter
name: Patlassov, Oleg
name: Schulze, Eberhard
name: Tillack, Peter
name: Patlassov, Oleg
Publisher: name: Unknown
Year: 2002
Subjects: subject: Agribusiness
subject: Agricultural Finance
subject: Farm Management
subject: Industrial Organization
subject: Land Economics/Use
subject: Landwirtschaftliche Großbetriebe
subject: Rentabilität
subject: Schulden
subject: сельскохозяйственные крупные предприятия
subject: рентабельность
subject: задолженность
subject: Large-scale Farms
subject: profitability
subject: debts.

description: The discussion paper 40 represents the results of an analysis for determining influencing factors on profits and profitability of Russian enterprises in the region of Omsk. Based on the final yearly reports of the enterprises it is shown, that in Russia five earning ratios can be distinguished: the gross profit, the profit on sales, the profit before taxes, the profit on ordinary activity, and the net profit. The gross profit and the profit on sales are similar for all tested enterprises. Therefore, in this article only the gross profit, or the profitability of the gross profit are discussed. For the year 2000, the average profitability of the gross profit of the examined enterprises amounted to 2,0 %. The profitability on the basis of the profit before taxes was 6,4 %, the profitability of the profit on ordinary activity -9,8 %, and the profitability of the net profit amounted to -16,0 %. When compared with the profit before taxes, the reduced profit on ordinary activity is caused by taxes and similar tributes which are notably higher than the governmental subsidies granted to the enterprises. The extremely low profitability rate of -16 % based on the net profit is additionally influenced by extraordinary tributes, caused by locusts in this case. However, if the enterprises would not have costs for supporting the households, and if the government would assume the costs for the social infrastructure of the village, a duty it is in charge of by law, all four earning ratios would be positive: 26,4 %; 31,8 %; 11,8 %; 4,1 % respectively. The regression analyses show that the earning and the profitability ratios are positively influenced by the material factors fuel consumption, number of cows and milking performance per cow and year. In contrast, the number of tractors and, for net profit, the number of permanent employees have a negative effect on these parameters. The regression analyses based on financial factors demonstrate the significant positive or respectively negative influence of the proceeds and the costs. Furthermore, there are veritable positive effects of subsidies and negative influences of taxes and extraordinary tributes. Detailed consideration of costs shows that material usage have positive, and amortisation and remuneration of work negative effects. As particularly shown by the factor and cluster analyses, the profits decline with increasing grassland and forest area.
Ownership structures, profitability and debts of agricultural large firms in the Volgograd region
Creators: name: Schulze, Eberhard
name: Tillack, Peter
name: Gerasin, Sergej
name: Schulze, Eberhard
name: Tillack, Peter
name: Gerasin, Sergej
Publisher: name: Unknown
Year: 2001
Subjects: subject: Agribusiness
subject: Agricultural Finance
subject: Farm Management
subject: Industrial Organization
subject: Land Economics/Use
subject: Productivity Analysis
subject: Large-scale Farms
subject: Land Ownership
subject: vote mode
subject: profitability
subject: debts
subject: Landwirtschaftliche Großbetriebe
subject: Bodeneigentum
subject: Abstimmungsmodus
subject: Rentabilität
subject: Schulden
subject: сельскохозяйственные крупные предприятия
subject: собственность на землю
subject: рентабельность
subject: задолженность.

description: Discussion Paper 34 contains information on property relations and profitability of 100 Russian large-scale farm enterprises, gathered in interviews in the Volgograd region in 2000. They are an integrated part of research activities concerning the privatisation and restructuring of farm enterprises in Central and Eastern Europe and take up the subject of Discussion Paper 18. 31 questions were formulated. The answers were evaluated using multivariate statistical methods. Comprehensive knowledge was obtained about number and size of land and capital shares, voting mode, indebtedness, cost of social security contributions for the employees and of the support for household plots and ensuing consequences for the profitability of enterprises. Within a farm, land shares are principally of the same size varying between 2.6 and 48.5 hectares. Farm workers hold 53.0 % of the land shares and 53.3 % of the capital. In 14 out of 23 corporations the voting mode was not in agreement with the legal rules. A significant nonlinear relationship between acreage and profitability could be confirmed. Compared with medium-sized farms, the profitability was higher in some very large (>20 thousand ha) and also in relatively small farms (approx. 4 thousand ha). In case of the latter it was to be checked up whether and which way restructuring would be feasible in order to raise the profitability level. The average cost efficiency of large-scale farms as used in Russia for reporting on profitability was 3.4 % in 1999. If the costs of social security contributions by the farms for the workers, support for family farms and sometimes unusually high depreciation rates are neglected, the average cost efficiency is clearly higher (25.5 %). 15 farms out of 59 believe that they are able to settle the debt problem under their own steam; 9 hope for contributions by the government, and 35 expect a full assumption of their debts by the state.
An Empirical Investigation of Reputation Loan Size Dynamics in Rural Credit Markets in Honduras
Creators: name: Sundaram-Stukel, Reka
name: Barham, Bradford L.
name: Sundaram-Stukel, Reka
name: Barham, Bradford L.
Publisher: name: Unknown
Year: 2007
Subjects: Research Methods/ Statistical Methods

description: This paper examines the role of two types of reputation - borrower credit history and productivity - in disequilibrium supply and demand models of loan size dynamics in formal and informal credit markets. Using panel data on Honduran households, full- and partial-information regime switching econometric models yield four principal findings: (1) credit contracts in the formal sector are largely collateral driven and not reputation driven; (2) the informal sector credit contracts are borrower reputation based; (3) the informal sector utilizes positive/negative credit histories in both markets to credibly reward/punish borrowers; and (4) technical efficiency has a positive impact in determining loan size in both sectors on the demand and supply side of the market.
The Specialist in Today’s University of Wisconsin – Extension
Creators: name: Deller, Steven C.
name: Preissing, John
name: Deller, Steven C.
name: Preissing, John
Publisher: name: Unknown
Year: 2008
Subjects: Teaching/Communication/Extension/Profession

description: As part of a comprehensive strategic planning effort undertaken by the University of Wisconsin-Extension, Cooperative Extension Service (UWEX-CES), a web-based survey of state specialists was undertaken in the fall of 2007. This manuscript represents the “reporting-out” of the survey results. Based on the work of the strategic planning committee this survey covers a range of issues, but focuses on the role of the specialist in today’s UW-Extension as well as the notion of scholarship. Specialists in general reported that they felt comfortable in their own roles but expressed concern that non-Extension colleagues lacked an appreciation for Extension work and notions of scholarship. While specialists general enjoy wearing numerous “hats” they expressed concern that an increasingly smaller resource pool is pulling them in too many different directions. Specialists strongly subscribe to the idea that Extension educational programming is research based and that research must stand the test of peer review. There is disagreement, however, on what constitutes peer review. Many specialists have the opinion that publishing their work in appropriate scholarly journals is the standard barer of peer review while others disagree. Many noted in written and verbal comments, however, because of the wide heterogeneity of specialists it is difficult if not dangerous to talk about the “representative” specialist. Yet, the survey results suggest that on a range of issues, the specialists are generally in agreement.
The Dynamic Effects of Open-Space Conservation Policies on Residential Development Density
Creators: name: Lewis, David J.
name: Provencher, Bill
name: Butsic, Van
name: Lewis, David J.
name: Provencher, Bill
name: Butsic, Van
Publisher: name: Unknown
Year: 2008
Subjects: Environmental Economics and Policy
Land Economics/Use

description: Recent economic analyses emphasize that designated open-space increases the rents on neighboring residential land, and likewise, the probability of undeveloped land converting to residential uses. This paper addresses a different question: What is the effect of local open space conservation on the rate of growth in the density of existing residential land? The analysis is relevant for exurban development and also for remote lakeshore development, where shoreline development density can rapidly increase over time and open-space policies are often advocated as a way to protect ecosystems by reducing development. A discrete choice econometric model of lakeshore development is estimated with a unique parcel-level spatial-temporal dataset, using maximum simulated likelihood to account for i) the panel structure of the data, ii) unobserved spatial heterogeneity, and iii) sample selection resulting from correlated unobservables. Results indicate that, contrary to the intuition derived from the current literature, local open space conservation policies do not increase the rate of growth in residential development density, and some open space conservation policies may reduce the rate of growth in residential development density. This is consistent with land-value complementarity between local open space and parcel size. Spatially-explicit simulations at the landscape scale examine the relative effects of conservation policies on the time path of development.
Structural evolution and skyrmionic phase diagram of the lacunar spinel GaMo$_4$Se$_8$
Creators: name: Schueller, Emily C.
name: Kitchaev, Daniil A.
name: Zuo, Julia L.
name: Bocarsly, Joshua D.
name: Cooley, Joya A.
name: Van der Ven, Anton
name: Wilson, Stephen D.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: In the $AB_4Q_8$ lacunar spinels, the electronic structure is described on the basis of inter- and intra-cluster interactions of tetrahedral $B_4$ clusters, and tuning these can lead to myriad fascinating electronic and magnetic ground states. In this work, we employ magnetic measurements, synchrotron X-ray and neutron scattering, and first-principles electronic structure calculations to examine the coupling between structural and magnetic phase evolution in GaMo$_4$Se$_8$, including the emergence of a skyrmionic regime in the magnetic phase diagram. We show that the competition between two distinct Jahn-Teller distortions of the room temperature cubic $F\overline{4}3m$ structure leads to the coexistence of the ground state $R3m$ phase and a metastable $Imm2$ phase. The magnetic properties of these two phases are computationally shown to be very different, with the $Imm2$ phase exhibiting uniaxial ferromagnetism and the $R3m$ phase hosting a complex magnetic phase diagram including equilibrium Néel--type skyrmions stable from nearly $T$ = 28 K down to $T$ = 2 K, the lowest measured temperature. The large change in magnetic behavior induced by a small structural distortion reveals that GaMo$_4$Se$_8$ is an exciting candidate material for tuning unconventional magnetic properties $via$ mechanical means.
The Effect of Ethanol Production on the U.S. National Corn Price
Creators: name: Fortenbery, T. Randall
name: Park, Hwanil
name: Fortenbery, T. Randall
name: Park, Hwanil
Publisher: name: Unknown
Year: 2008
Subjects: Agribusiness
Crop Production/Industries

description: A system of equations representing corn supply, feed demand, export demand, food, alcohol and industrial (FAI) demand, and corn price is estimated by three-stage least squares. A price dependent reduced form equation is then formed to investigate the effect of ethanol production on the national average corn price. The elasticity of corn price with respect to ethanol production is then obtained. Results suggest that ethanol production has a positive impact on the national corn price and that the demand from FAI has a greater impact on the corn price than other demand categories. Thus, significant growth in ethanol production is important in explaining corn price determination.
High dimensional characterization of the longitudinal phase space formed in a radio frequency quadrupole
Creators: name: Ruisard, K.
name: Aleksandrov, A.
name: Cousineau, S.
name: Shishlo, A.
name: Tzoganis, V.
name: Zhukov, A.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Accelerator Physics (physics.acc-ph)
subject: FOS: Physical sciences

description: Modern accelerator front ends almost exclusively include radio-frequency quadrupoles for initial capture and focusing of the low-energy beam. Dynamics in the RFQ define the longitudinal bunch parameters. Simulation of the SNS RFQ with PARMTEQ seeded with a realistic LEBT distribution produces a 2.5 MeV, 40 mA H- beam with root-mean-square emittance of 130 deg-keV. In measurement, a detailed characterization of the longitudinal phase space is made, including a novel study of the dependence of longitudinal emittance on transverse coordinates. This work introduces a new virtual slit technique that provides sub-slit resolution in an energy spectrometer as well as an approach for visualizing 4D phase space data. Through simulation and measurement, the RFQ-formed bunch is confirmed to have significant internal correlated structure. The high-dimensional features are shown to be in qualitative agreement. However, the measured rms emittances are up to 30% lower than predicted, closer to the design value of 95 deg-keV.
description: 16 pages, 20 figures, submitted to PRAB
Water Quality Credit Trading and Agriculture: Recognizing the Challenges and Policy Issues Ahead
Creators: name: Abdalla, Charles W.
name: Borisova, Tatiana
name: Parker, Douglas D.
name: Saacke Blunk, Kristen
name: Abdalla, Charles W.
name: Borisova, Tatiana
name: Parker, Douglas D.
name: Saacke Blunk, Kristen
Publisher: name: Unknown
Year: 2007
Subjects: Resource /Energy Economics and Policy

description: Outstanding Choices Article Award, 2008
Understanding the effect of hyperparameter optimization on machine learning models for structure design problems
Creators: name: Du, Xianping
name: Xu, Hongyi
name: Zhu, Feng
Publisher: name: arXiv
Year: 2020
Subjects: subject: Machine Learning (cs.LG)
subject: Applications (stat.AP)
subject: FOS: Computer and information sciences

description: To relieve the computational cost of design evaluations using expensive finite element simulations, surrogate models have been widely applied in computer-aided engineering design. Machine learning algorithms (MLAs) have been implemented as surrogate models due to their capability of learning the complex interrelations between the design variables and the response from big datasets. Typically, an MLA regression model contains model parameters and hyperparameters. The model parameters are obtained by fitting the training data. Hyperparameters, which govern the model structures and the training processes, are assigned by users before training. There is a lack of systematic studies on the effect of hyperparameters on the accuracy and robustness of the surrogate model. In this work, we proposed to establish a hyperparameter optimization (HOpt) framework to deepen our understanding of the effect. Four frequently used MLAs, namely Gaussian Process Regression (GPR), Support Vector Machine (SVM), Random Forest Regression (RFR), and Artificial Neural Network (ANN), are tested on four benchmark examples. For each MLA model, the model accuracy and robustness before and after the HOpt are compared. The results show that HOpt can generally improve the performance of the MLA models in general. HOpt leads to few improvements in the MLAs accuracy and robustness for complex problems, which are featured by high-dimensional mixed-variable design space. The HOpt is recommended for the design problems with intermediate complexity. We also investigated the additional computational costs incurred by HOpt. The training cost is closely related to the MLA architecture. After HOpt, the training cost of ANN and RFR is increased more than that of the GPR and SVM. To sum up, this study benefits the selection of HOpt method for the different types of design problems based on their complexity.
description: 43 pages, 15 figures,8 tables, Accepted by the Computer-aided design
Evolutionary synthesis of galaxies at high spectral resolution with the code PEGASE-HR
Creators: name: Borgne, Damien Le
name: Rocca-Volmerange, Brigitte
name: Prugniel, Philippe
name: Lancon, Ariane
name: Fioc, Michel
name: Soubiran, Caroline
Publisher: name: arXiv
Year: 2004
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present PEGASE-HR, a new stellar population synthesis program generating high resolution spectra (R=10 000) over the optical range lambda=400--680 nm. It links the spectro-photometric model of galaxy evolution PEGASE.2 (Fioc & Rocca-Volmerange 1997) to an updated version of the ELODIE library of stellar spectra observed with the 193 cm telescope at the Observatoire de Haute-Provence (Prugniel & Soubiran 2001a). The ELODIE star set gives a fairly complete coverage of the Hertzprung-Russell (HR) diagram and makes it possible to synthesize populations in the range [Fe/H]=-2 to +0.4. This code is an exceptional tool for exploring signatures of metallicity, age, and kinematics. We focus on a detailed study of the sensitivity to age and metallicity of the high-resolution stellar absorption lines and of the classical metallic indices proposed until now to solve the age-metallicity degeneracy. Validity tests on several stellar lines are performed by comparing our predictions for Lick indices to the models of other groups. The comparison with the lower resolution library BaSeL (Lejeune et al. 1997) confirms the quality of the ELODIE library when used for simple stellar populations (SSPs) from 10 Myr to 20 Gyr. Predictions for the evolved populations of globular clusters and elliptical galaxies are given and compared to observational data. Two new high-resolution indices are proposed around the Hgamma line. They should prove useful in the analysis of spectra from the new generation of telescopes and spectrographs.
description: 18 pages, 18 figures. Astronomy & Astrophysics, in press. The models are available at http://www.iap.fr/pegase/
Classification of the factorial functions of Eulerian binomial and Sheffer posets
Creators: name: Ehrenborg, Richard
name: Readdy, Margaret A.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Combinatorics (math.CO)
subject: FOS: Mathematics
subject: 05E99, 06A07

description: We give a complete classification of the factorial functions of Eulerian binomial posets. The factorial function B(n) either coincides with $n!$, the factorial function of the infinite Boolean algebra, or $2^{n-1}$, the factorial function of the infinite butterfly poset. We also classify the factorial functions for Eulerian Sheffer posets. An Eulerian Sheffer poset with binomial factorial function $B(n) = n!$ has Sheffer factorial function D(n) identical to that of the infinite Boolean algebra, the infinite Boolean algebra with two new coatoms inserted, or the infinite cubical poset. Moreover, we are able to classify the Sheffer factorial functions of Eulerian Sheffer posets with binomial factorial function $B(n) = 2^{n-1}$ as the doubling of an upside down tree with ranks 1 and 2 modified. When we impose the further condition that a given Eulerian binomial or Eulerian Sheffer poset is a lattice, this forces the poset to be the infinite Boolean algebra $B_X$ or the infinite cubical lattice $C_X^{< \infty}$. We also include several poset constructions that have the same factorial functions as the infinite cubical poset, demonstrating that classifying Eulerian Sheffer posets is a difficult problem.
description: 23 pages. Minor revisions throughout. Most noticeable is title change. To appear in JCTA
Ferromagnetic-superconducting hybrid films and their possible applications: A direct study in a model combinatorial film
Creators: name: Stamopoulos, D.
name: Pissas, M.
name: Manios, E.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Model combinatorial films (CFs) which host a pure superconductor adjacent to a ferromagneticsuperconducting hybrid film (HF) are manufactured for the study of the influence of ferromagnetic nanoparticles (FNs) on the nucleation of superconductivity. Careful resistance measurements were performed simultaneously on two different sites of the CFs. Enhancement of superconductivity and magnetic memory effects were observed only on the hybrid site of the CFs but were absent on their purely superconducting part. Our results give direct proof that the FNs modulate the superconducting order parameter in an efficient and controlled way giving us the possibility of miscellaneous practical applications.
description: To appear in Physical Review B
Anomalously low PAH emission from low-luminosity galaxies
Creators: name: Hogg, David W.
name: Tremonti, Christy A.
name: Blanton, Michael R.
name: Finkbeiner, Douglas P.
name: Padmanabhan, Nikhil
name: Quintero, Alejandro D.
name: Schlegel, David J.
name: Wherry, Nicholas
Publisher: name: arXiv
Year: 2004
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The Spitzer Space Telescope First Look Survey Infrared Array Camera (IRAC) near and mid-infrared imaging data partially overlaps the Sloan Digital Sky Survey (SDSS), with 313 visually selected (r<17.6 mag) SDSS Main Sample galaxies in the overlap region. The 3.5 and 7.8 um properties of the galaxies are investigated in the context of their visual properties, where the IRAC [3.5] magnitude primarily measures starlight, and the [7.8] magnitude primarily measures PAH emission from the interstellar medium. As expected, we find a strong inverse correlation between [3.5]-[7.8] and visual color; galaxies red in visual colors (`red galaxies') tend to show very little dust and molecular emission (low `PAH-to-star' ratios), and galaxies blue in visual colors (`blue galaxies,' ie, star-forming galaxies) tend to show large PAH-to-star ratios. Red galaxies with high PAH-to-star ratios tend to be edge-on disks reddened by dust lanes. Simple, visually inferred attenuation corrections bring the visual colors of these galaxies in line with those of face-on disks; ie, PAH emission is closely related to attenuation-corrected, optically inferred star-formation rates. Blue galaxies with anomalously low PAH-to-star ratios are all low-luminosity star-forming galaxies. There is some weak evidence in this sample that the deficiency in PAH emission for these low-luminosity galaxies may be related to emission-line metallicity.
description: submitted to ApJ. Because of some obscure arXiv bug, the RGB figure may appear correctly only in the PDF version
TactileAR: Active Tactile Pattern Reconstruction
Creators: name: Wu, Bing
name: Liu, Qian
Publisher: name: arXiv
Year: 2024
Subjects: subject: Robotics (cs.RO)
subject: FOS: Computer and information sciences

description: High-resolution (HR) contact surface information is essential for robotic grasping and precise manipulation tasks. However, it remains a challenge for current taxel-based sensors to obtain HR tactile information. In this paper, we focus on utilizing low-resolution (LR) tactile sensors to reconstruct the localized, dense, and HR representation of contact surfaces. In particular, we build a Gaussian triaxial tactile sensor degradation model and propose a tactile pattern reconstruction framework based on the Kalman filter. This framework enables the reconstruction of 2-D HR contact surface shapes using collected LR tactile sequences. In addition, we present an active exploration strategy to enhance the reconstruction efficiency. We evaluate the proposed method in real-world scenarios with comparison to existing prior-information-based approaches. Experimental results confirm the efficiency of the proposed approach and demonstrate satisfactory reconstructions of complex contact surface shapes. Code: https://github.com/wmtlab/tactileAR
description: accepted by ICRA 2024
Non Perturbative Renormalization Group, momentum dependence of $n$-point functions and the transition temperature of the weakly interacting Bose gas
Creators: name: Blaizot, Jean-Paul
name: Galain, Ramon Mendez
name: Wschebor, Nicolas
Publisher: name: arXiv
Year: 2004
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: We propose a new approximation scheme to solve the Non Perturbative Renormalization Group equations and obtain the full momentum dependence of $n$-point functions. This scheme involves an iteration procedure built on an extension of the Local Potential Approximation commonly used within the Non Perturbative Renormalization Group. Perturbative and scaling regimes are accurately reproduced. The method is applied to the calculation of the shift $ΔT_c$ in the transition temperature of the weakly repulsive Bose gas, a quantity which is very sensitive to all momenta intermediate between these two regions. The leading order result is in agreement with lattice calculations, albeit with a theoretical uncertainty of about 25%. The next-to-leading order differs by about 10% from the best accepted result.
Non-thermal X-rays, a high abundance ridge and fossil bubbles in the core of the Perseus cluster of galaxies
Creators: name: Sanders, J. S.
name: Fabian, A. C.
name: Dunn, R. J. H.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Using a deep Chandra observation of the Perseus cluster of galaxies, we find a high-abundance shell 250 arcsec (93 kpc) from the central nucleus. This ridge lies at the edge of the Perseus radio mini-halo. In addition we identify two Halpha filaments pointing towards this shell. We hypothesise that this ridge is the edge of a fossil radio bubble, formed by entrained enriched material lifted from the core of the cluster. There is a temperature jump outside the shell, but the pressure is continuous indicating a cold front. A non-thermal component is mapped over the core of the cluster with a morphology similar to the mini-halo. Its total luminosity is 4.8x10^43 erg/s, extending in radius to ~75 kpc. Assuming the non-thermal emission is the result of inverse Compton scattering of the CMB and infrared emission from NGC 1275, we map the magnetic field over the core of the cluster.
description: 8 pages, colour, accepted by MNRAS
Mach cones in an evolving medium
Creators: name: Renk, Thorsten
name: Ruppert, Jorg
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: The energy and momentum lost by a hard parton propagating through hot and dense matter has to be redistributed in the nuclear medium. Apart from heating the medium, there is the possibility that collective modes are excited. We outline a formalism that can be used to track the propagation of such a mode through the evolving medium if its dispersion relation is known. Under the assumption that a sound wave is created, we track the jet energy loss as a function of spacetime and follow the resulting mach cone throughout the fireball evolution.We compare with the angular correlation pattern of hard hadrons as obtained by the PHENIX collaboration and find good agreement with the data provided that a substantial fraction of jet energy ($\sim$ 90%) is deposited into a propagating mode and that the hot matter can be characterized by an EOS with a soft point (not necessarily a mixed phase).
description: 5 pages, 3 figures, submitted to PRC
title: Chronic thromboembolic pulmonary hypertension: Presentation on ECG-gated CT
Creators: name: Maduro, Luís
Publisher: name: EURORAD
Year: 2024
Subjects: subject: Cardiovascular
subject: Pulmonary vessels
subject: CT-Angiography
subject: Education
subject: Embolism / Thrombosis
subject: Clinical Case

description: Clinical History: A 78-year-old male patient presented with worsening exertional dyspnea. Echocardiogram revealed signs of right ventricle dysfunction and elevation of pulmonary artery systolic pressure (PASP) to 81 mmHg (41 mmHg the year before), suggesting severe pulmonary hypertension (PH). Moderate tricuspid regurgitation was also noted. The patient underwent CT for further evaluation.

description: 78 years, male