cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Supplementary Movie 1 from Dynamic heterogeneity influences the leader–follower dynamics during epithelial wound closure
Creators: name: Medhavi Vishwakarma
name: Thurakkal, Basil
name: Spatz, Joachim P.
name: Tamal Das
Publisher: name: The Royal Society
Year: 2020
Subjects: Biophysics

description: Cells of epithelial tissue proliferate and pack together to attain an eventual density homeostasis. As the cell density increases, spatial distribution of velocity and force show striking similarity to the dynamic heterogeneity observed elsewhere in dense granular matter. While the physical nature of this heterogeneity is somewhat known in epithelial cell monolayer, its biological relevance and precise connection to cell density remain elusive. Relevantly, we had demonstrated how large-scale dynamic heterogeneity in the monolayer stress field in the bulk could critically influence the emergence of leader cells at the wound margin during wound closure, but did not connect the observation to the corresponding cell density. In fact, numerous previous reports had essentially associated long-range force and velocity correlation with either cell density or dynamic heterogeneity, without any generalization. Here, we attempted to unify these two parameters under a single framework and explored their consequence on the dynamics of leader cells, which eventually affected the efficacy of collective migration and wound closure. To this end, we first quantified the dynamic heterogeneity by the peak height of four-point susceptibility. Remarkably, this quantity showed a linear relationship with cell density over many experimental samples. We then varied the heterogeneity, by changing cell density, and found this change altered the number of leader cells at the wound margin. At low heterogeneity, wound closure was slower, with decreased persistence, reduced coordination and disruptive leader–follower interactions. Finally, microscopic characterization of cell–substrate adhesions illustrated how heterogeneity influenced orientations of focal adhesions, affecting coordinated cell movements. Together, these results demonstrate the importance of dynamic heterogeneity in epithelial wound healing.This article is part of the theme issue ‘Multi-scale analysis and modelling of collective migration in biological systems'.
The synthesis of a compound suitable for the elaboration of the C-ring of nitiol
Creators: name: Woo, Jacqueline C. S.
Publisher: name: University of British Columbia
Year: 2009

description: Compound 34 was a synthetic target suitable for the elaboration to the C-ring of nitiol (1), and was synthesized over six steps from the known alcohol 39. A convenient method for the synthesis of N-methoxy-N-methyl amides was also developed. Ester 38 was synthesized from alcohol 39, and was subjected to an Ireland-Claisen rearrangement to give acid 37. This step established the stereochemical relationship of the substituents of 34. Carboxylic acid 37 was converted to amide 51 by the use of triethylamine, methanesulfonyl chloride, and N,O-dimethylhydroxylamine. This method was also used in the synthesis of seven other examples of N-methoxy-N-methyl amides with good to excellent yields (61-84 %). Amide 51 was converted to vinyl ketone 36, and subsequent ring-closing metathesis afforded cyclopentenone 35 with a cis/trans ratio of 12:1. A 1,4-hydride reduction of cyclopentenone 35 and the subsequent trapping of the enolate as a trifluoromethanesulfonate gave 34 with a cis/trans ratio of 9:1. [Chemical Diagrams]
title: Aufgabenstellungen zu einer Seminareinheit mit dem TEXTLABOR (Anhang zum Buchkapitel)
Creators: name: Beißwenger, Michael
name: Burovikhina, Veronika
Publisher: name: DuEPublico: Duisburg-Essen Publications Online, University of Duisburg-Essen, Germany
Year: 2019
Subjects: Textlabor
Texterschließung
Inverted Classroom
Mediendidaktik

description: Digitaler Materialanhang zum folgenden Buchkapitel: Beißwenger, Michael; Burovikhina, Veronika (2019): Von der Black Box in den Inverted Classroom: Texterschließung kooperativ gestalten mit digitalen Lese- und Annotationswerkzeugen. In: Carolin Führer/Felician-Michael Führer (Hrsg.): Dissonanzen in der Lehrerbildung. Theoretische, empirische und hochschuldidaktische Rekonstruktionen und Perspektiven für das Fach Deutsch. Münster: Waxmann (Didaktik der deutschen Sprache und Literatur 2), ISBN 978-3-8309-4047-0.
title: Die Macht von Körpernormen. Dekonstruktive Perspektiven auf berufliche Identitätskonstruktionen junger Frauen*
Creators: name: Micus-Loos, Christiane
name: Plößer, Melanie
Publisher: name: Humboldt-Universität zu Berlin
Year: 2020
Subjects: subject: Berufswahlen
subject: Dekonstruktion
subject: Gender
subject: Heteronormativität
subject: Identitätsentwürfe
subject: Karriere
subject: Körpernormen
subject: Subjektivierung
subject: ddc:300

description: Dekonstruktive Gendertheorien öffnen den Blick auf Ordnungen und Normen, die die Identitätskonstruktionen der Subjekte rahmen und begrenzen. Mit Bezug auf empirisches Material, das in einem Forschungsprojekt zu Berufswahlentscheidungen junger Frauen* in Form von Gruppendiskussionen und Leitfadeninterviews erhoben wurde, geht es in dem Beitrag darum, normative Anforderungen in Bezug auf den Körper aufzuzeigen, denen sich junge Frauen* und Mädchen* im Rahmen ihrer beruflichen Zukunftsorientierungen zu stellen haben. Dabei wird deutlich, wie Körpernormen die Anerkennbarkeit der Subjekte im heteronormativen System der Zweigeschlechtlichkeit regulieren und welche Auswirkungen die antizipierten Risiken der Nicht-Erfüllung dieser Normen für die Selbstentwürfe junger Frauen* haben können.
Probabilistic Evolution of Stochastic Dynamical Systems: A Meso-scale Perspective
Creators: name: Yin, Chao
name: Luo, Xihaier
name: Kareem, Ahsan
Publisher: name: arXiv
Year: 2020
Subjects: subject: Computational Engineering, Finance, and Science (cs.CE)
subject: Data Analysis, Statistics and Probability (physics.data-an)
subject: FOS: Computer and information sciences
subject: FOS: Physical sciences

description: Stochastic dynamical systems arise naturally across nearly all areas of science and engineering. Typically, a dynamical system model is based on some prior knowledge about the underlying dynamics of interest in which probabilistic features are used to quantify and propagate uncertainties associated with the initial conditions, external excitations, etc. From a probabilistic modeling standing point, two broad classes of methods exist, i.e. macro-scale methods and micro-scale methods. Classically, macro-scale methods such as statistical moments-based strategies are usually too coarse to capture the multi-mode shape or tails of a non-Gaussian distribution. Micro-scale methods such as random samples-based approaches, on the other hand, become computationally very challenging in dealing with high-dimensional stochastic systems. In view of these potential limitations, a meso-scale scheme is proposed here that utilizes a meso-scale statistical structure to describe the dynamical evolution from a probabilistic perspective. The significance of this statistical structure is two-fold. First, it can be tailored to any arbitrary random space. Second, it not only maintains the probability evolution around sample trajectories but also requires fewer meso-scale components than the micro-scale samples. To demonstrate the efficacy of the proposed meso-scale scheme, a set of examples of increasing complexity are provided. Connections to the benchmark stochastic models as conservative and Markov models along with practical implementation guidelines are presented.
description: 33 pages, 10 figures
Tunneling in a uniform one-dimensional superfluid: emergence of a complex instanton
Creators: name: Khlebnikov, S.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: In a uniform ring-shaped one-dimensional superfluid, quantum fluctuations that unwind the order parameter need to transfer momentum to quasiparticles (phonons). We present a detailed calculation of the leading exponential factor governing the rate of such phonon-assisted tunneling in a weakly-coupled Bose gas at a low temperature $T$. We also estimate the preexponent. We find that for small superfluid velocities the $T$-dependence of the rate is given mainly by $\exp(-c_s P/ 2T)$, where $P$ is the momentum transfer, and $c_s$ is the phonon speed. At low $T$, this represents a strong suppression of the rate, compared to the non-uniform case. As a part of our calculation, we identify a complex instanton, whose analytical continuation to suitable real-time segments is real and describes formation and decay of coherent quasiparticle states with nonzero total momenta.
description: 15 pages, 3 figures; to be published in Phys. Rev. A
Lucky Leif und die bärtigen Männer
Creators: name: Peters, Christian
Publisher: name: Mittelalter Digital
Year: 2021

description: Lange bevor er zur Zielscheibe postkolonialer Ikonoklasmen wurde, war Christoph Columbus bereits von anderer Seite in diskursive Bedrängnis gebracht worden: Im Vorfeld der Weltausstellung 1893 in Chicago, die mit dem vierhundertsten Jahrestag von Columbus‘ Landung auf Hispaniola mehr oder minder in eins fiel, regte sich Unmut bei den skandinavischen Einwanderern, von denen am Austragungsort und in den umgebenden Staaten des Mittleren Westens, insbesondere aus Norwegen, im Laufe des Jahrhunderts viele eine neue Heimat gefunden hatten. Überzogen sei die Anerkennung für den Genuesen Columbus, der den Kontinent nur durch Zufall und mehr schlecht als recht mit einer für wildere Gewässer völlig ungeeigneten südländischen Besatzung gefunden habe, und unbegründet daher auch der Stolz der italoamerikanischen Bevölkerung der noch nicht allzu alten Nation, deren Sozialstruktur sich durch rasante Industrialisierung ebenso wie durch den Zuzug von Millionen Migranten aus nicht-angelsächsischen Regionen Europas dramatisch veränderte und damit intensive Aushandlungsprozesse um ethnische vs. nationale Identität ebenso wie kulturelle Vormachtstellung zeitigte.
description: Mittelalter Digital, Bd. 1 Nr. 2 (2020): Wikinger und Normannen
From gymnastics to virtual nonholonomic constraints: energy injection, dissipation, and regulation for the acrobot
Creators: name: Moran-MacDonald, Adan
name: Maggiore, Manfredi
name: Wang, Xingbo
Publisher: name: arXiv
Year: 2024
Subjects: subject: Robotics (cs.RO)
subject: Optimization and Control (math.OC)
subject: FOS: Computer and information sciences
subject: FOS: Mathematics

description: In this article we study virtual nonholonomic constraints, which are relations between the generalized coordinates and momenta of a mechanical system that can be enforced via feedback control. We design a constraint which emulates gymnastics giant motion in an acrobot, and prove that this constraint can inject or dissipate energy based on the sign of a design parameter. The proposed constraint is tested both in simulation and experimentally on a real-world acrobot, demonstrating highly effective energy regulation properties and robustness to a variety of disturbances.
Searching for dark matter with an unequal delay interferometer
Creators: name: Savalle, Etienne
name: Hees, Aurelien
name: Frank, Florian
name: Cantin, Etienne
name: Pottie, Paul-Eric
name: Roberts, Benjamin M.
name: Cros, Lucie
name: McAllister, Ben T.
name: Wolf, Peter
Publisher: name: arXiv
Year: 2020
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We propose a new type of experiment that compares the frequency of a clock (an ultra-stable optical cavity in this case) at time $t$ to its own frequency some time $t-T$ earlier, by "storing" the output signal (photons) in a fibre delay line. In ultra-light oscillating dark matter (DM) models, such an experiment is sensitive to coupling of DM to the standard model fields, through oscillations of the cavity and fibre lengths and of the fibre refractive index. Additionally, the sensitivity is significantly enhanced around the mechanical resonances of the cavity. We present experimental result of such an experiment and report no evidence of DM for masses in the [$4.1\times 10^{-11}$, $8.3\times 10^{-10}$]~eV region. In addition, we improve constraints on the involved coupling constants by one order of magnitude in a standard galactic DM model, at the mass corresponding to the resonant frequency of our cavity. Furthermore, in the model of relaxion DM, we improve on existing constraints over the whole DM mass range by about one order of magnitude, and up to six orders of magnitude at resonance.
description: 5 main pages and 8 supplemental pages, 3 main figures and 2 supplemental, Accepted by PRL
Prospect of Molecular Sieves Production using Rice Husk in Bangladesh: A Review
Creators: name: Md. Abdus Salam
name: Kawsar Ahmed
name: Hossain, Tareq
name: Habib, Shehan
name: Md. Sahab Uddin
name: Papri, Nasrin
Publisher: name: figshare
Year: 2020
Subjects: subject: 30301 Chemical Characterisation of Materials
subject: FOS: Chemical sciences

description: A growing need of molecular sieves, now a day, in many industries of Bangladesh makes the materials
most important and attracted special attention. The review explores each step involved in the whole process of
molecular sieves preparation from rice husk (RH). Many refineries and chemical industries are using molecular
sieves as adsorbent material and process catalyst very efficiently. Rice husk is one of the potential sources of
biomass to get a maximum percent of SiO2 that is required to synthesize molecular sieves. 93.2% of SiO2 can be
extracted from rice husk ash (RHA). In the fiscal year of 2016-2017, about 6.86 million tons of rice husk are
produced in Bangladesh whereas worldwide production of rice husk is approximately 97.24 million tons.
Geographical locations, combustion methods, and temperature are influencing factor mainly to get the content of
silica and structure of molecular sieves.) Rice husk ash containing amorphous silica is produced at temperatures
lower than 800oC (500-800oC). The chemical method with washing pretreatment and post heat treatment are
considered as the most simple and successful SiO2 extraction methods from RH. Different types of molecular sieves;
13x, 3A, 4A & 5A can successfully be synthesized via the widely used hydrothermal method. Molar ratio of
ingredients, reaction temperature, time, acid-base media, ageing etc. are key factors to be considered in designing
different molecular sieves.
Preparation and characterization of Neem Bark Extract with antimicrobial activity
Creators: name: Roy, Sudipta Roy Sudipta
name: Devender Sharma
Publisher: name: figshare
Year: 2020
Subjects: subject: 110106 Medical Biochemistry: Proteins and Peptides (incl. Medical Proteomics)
subject: FOS: Clinical medicine

description: Aim and objective of this study was to prepare and characterize of Neem Bark Extract from Azadirachata indica (family – Meliaceae). In the mid of August 2020, the stem bark was collected from the Azadirachata indica tree. After preparing neem bark methanolic extract from stem of Azadirachata Indica, extract was characterized by physical property evaluation, chemical property evaluation, antimicrobial evaluation, by determination of λ max using methanol and ethanol solvent, percentage of purity of prepared Azadirachta indica bark exracts using UV spectroscopic method (shimadzu-1700), doing structural elucidation by FTIR study in laboratory.
What rotation rate maximizes heat transport in rotating Rayleigh-Bénard convection with Prandtl number larger than one?
Creators: name: Yang, Yantao
name: Verzicco, Roberto
name: Lohse, Detlef
name: Stevens, Richard J. A. M.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: The heat transfer and flow structure in rotating Rayleigh-Bénard convection are strongly influenced by the Rayleigh ($Ra$), Prandtl ($Pr$), and Rossby ($Ro$) number. For $Pr\gtrsim 1$ and intermediate rotation rates, the heat transfer is increased compared to the non-rotating case. We find that the regime of increased heat transfer is subdivided into a low and a high $Ra$ number regime. For $Ra\lesssim 5\times10^8$ the heat transfer at a given $Ra$ and $Pr$ is highest at an optimal rotation rate, at which the thickness of the viscous and thermal boundary layer is about equal. From the scaling relations of the thermal and viscous boundary layer thicknesses, we derive that the optimal rotation rate scales as $1/Ro_\mathrm{opt} \approx 0.12 Pr^{1/2}Ra^{1/6}$. In the low $Ra$ regime the heat transfer is similar in a periodic domain and cylindrical cells with different aspect ratios, i.e.\ the ratio of diameter to height. This is consistent with the view that the vertically aligned vortices are the dominant flow structure. For $Ra\gtrsim 5\times10^8$ the above scaling for the optimal rotation rate does not hold anymore. It turns out that in the high $Ra$ regime, the flow structures at the optimal rotation rate are very different than for lower $Ra$. Surprisingly, the heat transfer in the high $Ra$ regime differs significantly for a periodic domain and cylindrical cells with different aspect ratios, which originates from the sidewall boundary layer dynamics and the corresponding secondary circulation.
description: 16 pages, 11 figures, 15 tables
The BCS-Bose Crossover Theory
Creators: name: Adhikari, S. K.
name: de Llano, M.
name: Sevilla, F. J.
name: Solis, M. A.
name: Valencia, J. J.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We contrast {\it four} distinct versions of the BCS-Bose statistical crossover theory according to the form assumed for the electron-number equation that accompanies the BCS gap equation. The four versions correspond to explicitly accounting for two-hole-(2h) as well as two-electron-(2e) Cooper pairs (CPs), or both in equal proportions, or only either kind. This follows from a recent generalization of the Bose-Einstein condensation (GBEC) statistical theory that includes not boson-boson interactions but rather 2e- and also (without loss of generality) 2h-CPs interacting with unpaired electrons and holes in a single-band model that is easily converted into a two-band model. The GBEC theory is essentially an extension of the Friedberg-T.D. Lee 1989 BEC theory of superconductors that excludes 2h-CPs. It can thus recover, when the numbers of 2h- and 2e-CPs in both BE-condensed and noncondensed states are separately equal, the BCS gap equation for all temperatures and couplings as well as the zero-temperature BCS (rigorous-upper-bound) condensation energy for all couplings. But ignoring either 2h- {\it or} 2e-CPs it can do neither. In particular, only {\it half} the BCS condensation energy is obtained in the two crossover versions ignoring either kind of CPs. We show how critical temperatures $T_{c}$ from the original BCS-Bose crossover theory in 2D require unphysically large couplings for the Cooper/BCS model interaction to differ significantly from the $T_{c}$s of ordinary BCS theory (where the number equation is substituted by the assumption that the chemical potential equals the Fermi energy).
description: thirteen pages including two figures. Physica C (in press, 2007)
Comment on "On the temperature dependence of the Casimir effect"
Creators: name: Bezerra, V. B.
name: Decca, R. S.
name: Fischbach, E.
name: Geyer, B.
name: Klimchitskaya, G. L.
name: Krause, D. E.
name: López, D.
name: Mostepanenko, V. M.
name: Romero, C.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Quantum Physics (quant-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Recently, Brevik et al. [Phys. Rev. E 71, 056101 (2005)] adduced arguments against the traditional approach to the thermal Casimir force between real metals and in favor of one of the alternative approaches. The latter assumes zero contribution from the transverse electric mode at zero frequency in qualitative disagreement with unity as given by the thermal quantum field theory for ideal metals. Those authors claim that their approach is consistent with experiments as well as with thermodynamics. We demonstrate that these conclusions are incorrect. We show specifically that their results are contradicted by four recent experiments and also violate the third law of thermodynamics (the Nernst heat theorem).
description: 11 pages, 3 figures, changed in accordance with the final published version
Harvest-Time Protein Shocks and Price Adjustment in U.S. Wheat Markets
Creators: name: Goodwin, Barry K.
name: Smith, Vincent H.
name: Goodwin, Barry K.
name: Smith, Vincent H.
Publisher: name: Unknown
Year: 2009
Subjects: subject: Crop Production/Industries
subject: protein
subject: thresholds
subject: vector autoregressions
subject: wheat prices

description: Dynamic relationships among three classes of wheat are investigated using threshold VAR models that incorporate the effects of protein availability. Changes in the stock of protein are found to generate significant responses in the prices of hard red spring wheat and hard red winter wheat, but not soft red wheat. The responses to identical changes in protein stocks are larger when the magnitudes of deviations of protein stocks from normal levels are large. Shocks to the prices of individual classes of wheat result in complex responses in the prices of the other wheat classes. Notably, however, a shock to the price of hard red winter wheat appears to result in little or no response in the price of hard spring wheat, though importantly, the opposite is not true.
Some Estimates of Farmers' Utility Functions
Creators: name: Hildreth, Clifford
name: Knowles, Glenn J.
name: Hildreth, Clifford
name: Knowles, Glenn J.
Publisher: name: Unknown
Year: 1982
Subjects: subject: Risk and Uncertainty
subject: utility
subject: Bayesian
subject: farmers
subject: uncertainty
subject: risk aversion
subject: decision theory
subject: cattle

description: Utility functions for 13 Minnesota farmers are estimated from their responses to hypothetical decision problems under uncertainty. The results furnish strong evidence of risk aversion and of decreasing absolute risk aversion as wealth increases.
GPS Observables in Newtonian Spacetime or Why We Do Not Need 'Physical' Coordinate Systems
Creators: name: Frauca, Álvaro Mozota
Publisher: name: arXiv
Year: 2024
Subjects: subject: History and Philosophy of Physics (physics.hist-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Some authors have defended the claim that one needs to be able to define 'physical coordinate systems' and 'observables' in order to make sense of general relativity. Moreover, in Rovelli (Physical Review D, 65(4), 044017 2002), Rovelli proposes a way of implementing these ideas by making use of a system of satellites that allows defining a set of 'physical coordinates', the GPS coordinates. In this article I oppose these views in four ways. First, I defend an alternative way of understanding general relativity which implies that we have a perfectly fine interpretation of the models of the theory even in the absence of 'physical coordinate systems'. Second, I analyze and challenge the motivations behind the 'observable' view. Third, I analyze Rovelli's proposal and I conclude that it does not allow extracting any physical information from our models that wasn't available before. Fourth, I draw an analogy between general relativistic spacetimes and Newtonian spacetimes, which allows me to argue that as 'physical observables' are not needed in Newtonian spacetime, then neither are they in general relativity. In this sense, I conclude that the 'observable' view of general relativity is unmotivated.
Towards an all-orders calculation of the electroweak bubble wall velocity
Creators: name: Hoeche, Stefan
name: Kozaczuk, Jonathan
name: Long, Andrew J.
name: Turner, Jessica
name: Wang, Yikun
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We analyze Higgs condensate bubble expansion during a first-order electroweak phase transition in the early Universe. The interaction of particles with the bubble wall can be accompanied by the emission of multiple soft gauge bosons. When computed at fixed order in perturbation theory, this process exhibits large logarithmic enhancements which must be resummed to all orders when the wall velocity is large. We perform this resummation both analytically and numerically at leading logarithmic accuracy. The numerical simulation is achieved by means of a particle shower in the broken phase of the electroweak theory. The two approaches agree to the 10\% level. For fast-moving walls, we find the scaling of the thermal pressure exerted against the wall to be $P\sim γ^2T^4$, independent of the particle masses, implying a significantly slower terminal velocity than previously suggested.
description: One minor typo removed on page 7 and one reference updated
The 192 Solutions of the Heun Equation
Creators: name: Maier, Robert S.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Classical Analysis and ODEs (math.CA)
subject: FOS: Mathematics
subject: 33E30; 33-04, 34M15, 33C05, 20F55

description: A machine-generated list of 192 local solutions of the Heun equation is given. They are analogous to Kummer's 24 solutions of the Gauss hypergeometric equation, since the two equations are canonical Fuchsian differential equations on the Riemann sphere with four and three singular points, respectively. Tabulation is facilitated by the identification of the automorphism group of the equation with n singular points as the Coxeter group D_n. Each of the 192 expressions is labeled by an element of D_4. Of the 192, 24 are equivalent expressions for the local Heun function Hl, and it is shown that the resulting order-24 group of transformations of Hl is isomorphic to the symmetric group S_4. The isomorphism encodes each transformation as a permutation of an abstract four-element set, not identical to the set of singular points.
description: 33 pages, final version, accepted by Mathematics of Computation
Interaction of a wave packet with potential structures moving with acceleration
Creators: name: Zakharov, M. A.
name: Kulin, G. V.
name: Frank, A. I.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The paper is devoted to a numerical study of the problem of interaction of the wave packet with potential structures moving with constant acceleration. In all the cases considered the result of the interaction is a change in the velocity spectrum. In the first approximation the magnitude of the shift in the spectrum is determined by the product of acceleration by group delay time. Also, as the direction of acceleration reverses the effect changes its sign. The results are completely consistent with the idea of universality of the Effect of Acceleration which consists in a change in the frequency of the wave at scattering on an object moving with acceleration.
Retail Prices for Milk by Fat Content: A New Theory and Empirical Test of Retailer Pricing Behavior
Creators: name: Xia, Tian
name: Sexton, Richard J.
name: Xia, Tian
name: Sexton, Richard J.
Publisher: name: Unknown
Year: 2009
Subjects: subject: Demand and Price Analysis
subject: Livestock Production/Industries
subject: differential costs
subject: horizontal differentiation
subject: milk
subject: oligopoly
subject: retail pricing

description: We study a heretofore unexamined type of product differentiation, horizontally differentiated products with differential costs, and apply the analysis to retail pricing of fluid milk products. The theoretical models yield unique predictions for the relationship among prices of the four horizontally differentiated fluid milk products (skim, 1%, 2%, and whole milk) and the impacts of butterfat and nonfat milk costs on prices, depending upon the form of retail competition. An empirical analysis of retail milk pricing for four major cities in California enables tests to be conducted of which form of behavior best characterizes grocery retailing in these cities.
title: “Please, bring me some coffee”: Illegitimate tasks as the explanation for the relationship between organisational sexism and occupational well-being // Inklusion und Intersektionalität in institutionellen Bildungskontexten
Creators: name: García Johnson, Carolina Pía
name: Otto, Kathleen
Publisher: name: Humboldt-Universität zu Berlin
Year: 2020
Subjects: subject: Arbeit
subject: human resources
subject: illegitimate tasks
subject: irritation
subject: job satisfaction
subject: occupational well-being
subject: Sexismus
subject: sexist organisational climate
subject: ddc:303

description: While overt forms of sexism in organisations are on the decline, covert ones are becoming the norm. This article argues that illegitimate tasks are a disguised form of gender-based discrimination and harassment. To support this argument, evidence is provided about the effects of sexism on occupational well-being that are caused by undertaking illegitimate tasks. The authors focus on the relationship between sexist organisational climate and illegitimate tasks and the resulting effects on job satisfaction and irritation. The empirical data used in the analyses were obtained from a cross-sectional study of a sample of German psychologists. After controlling for the effects of gender, the results provided evidence of the negative effects that a sexist organisational climate has on irritation and job satisfaction, mediated by illegitimate tasks.
Wikinger im modernen Brettspiel
Creators: name: Boch, Lukas
name: Falke, Anna Klara
Publisher: name: Mittelalter Digital
Year: 2021

description: Unter den modernen populärkulturellen Medien, die das Thema „Wikinger“ behandeln, darf das Medium der Brettspiele heutzutage nicht mehr ausgelassen werden. Während zu digitalen Spielen bereits eine stark wachsende Forschung existiert, gibt es trotz der steigenden Beliebtheit von Brettspielen bisher in diesem Bereich kaum Forschung. Dabei sind Brettspiele genau wie digitale Spiele ein Zeugnis unserer Zeit, in dem sich Vorstellungen und Normen einer Gesellschaft widerspiegeln – die wissenschaftliche Beschäftigung mit dem Medium erscheint daher lohnenswert. Ein möglicher Ansatz, wie eine historische Auseinandersetzung mit Brettspielen erfolgen kann, wird im Folgenden gegeben und anhand von drei Spielen mit Wikinger-Setting exemplarisch angewandt.
description: Mittelalter Digital, Bd. 1 Nr. 2 (2020): Wikinger und Normannen
Critical thresholds in 1D pressureless Euler-Poisson systems with varying background
Creators: name: Bhatnagar, Manas
name: Liu, Hailiang
Publisher: name: arXiv
Year: 2020
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics
subject: 35L65, 35L67

description: The Euler Poisson equations describe important physical phenomena in many applications such as semiconductor modeling and plasma physics. This paper is to advance our understanding of critical threshold phenomena in such systems in the presence of different forces. We identify critical thresholds in two damped Euler Poisson systems, with and without alignment, both with attractive potential and spatially varying background state. For both systems, we give respective bounds for subcritical and supercritical regions in the space of initial configuration, thereby proving the existence of a critical threshold for each scenario. Key tools include comparison with auxiliary systems, phase space analysis of the transformed system.
description: 20 pages, 2 figures
FISHING_TRASH
Creators: name: Jhonatan Acuña Huisacayna
name: Molina, Carlos Gonzales
name: Nakagawa, Brayan Guillen
Publisher: name: Zenodo
Year: 2021

description: El juego que planteamos cómo grupo es un juego que busca darle otra orientación a la pesca, ya que lo que buscamos con nuestra propuesta es generar conciencia en la población acerca de la contaminación de los ríos, mares y cómo esto afecta en la vida marina. Nuestro juego tiene una temática de conciencia social, en el cual el jugador toma la forma de un pescador anciano quien se ha dado cuenta que en las aguas donde normalmente solía pescar, ahora está llena de residuos los cuales son arrojados por muchos de los pobladores. Es así que tratando de solucionar este problema el pescador deja de hacer la actividad que normalmente solía hacer, la cual era pescar peces, para ahora enfocarse en recolectar la basura que hay en el lecho marino, además que por cada uno de estos residuos que el extraiga recibirá una recompensa, sin embargo, cómo su propósito es extraer la basura cuando este extraiga un pez se le penalizará, teniendo así un juego basado en recompensas
Monster, Trolle, Wikinger
Creators: name: Merkelbach, Rebecca
Publisher: name: Mittelalter Digital
Year: 2021

description: Die mittelalterliche Sagaliteratur Islands blickt mit einigem zeitlichen Abstand zurück auf die Wikingerzeit. In diesem Rückblick, der irgendwo zwischen Erinnerung und Imagination anzusiedeln ist, werden nicht nur die Besiedlung Islands, die Gründung der isländischen Gesellschaft und die Christianisierung des Landes reflektiert, sondern auch viele paranormale und monströse Wesen, die die Landschaften und Erzählungen bevölkern. In diesem Artikel möchte ich eine Einführung in die „Monsterwissenschaft“ geben, einige Ansätze vorstellen, und die trollischen Monster der Isländersagas beleuchten. Was macht diese Wesen aus? Wie werden sie dargestellt? Und inwiefern können wir sie als monströs bezeichnen? Monstrosität ist ein komplexes Thema, und ich kann hier nur einige generelle Punkte ansprechen. Ich hoffe aber, mit diesem Beitrag das Interesse an Monstern und/in den Isländersagas zu wecken.
description: Mittelalter Digital, Bd. 1 Nr. 2 (2020): Wikinger und Normannen
Wikingerschätze – Ein Glücksfall für die Münzgeschichte
Creators: name: Steinbach, Sebastian
Publisher: name: Mittelalter Digital
Year: 2021

description: Im Hintergrund steht ein Klostergebäude in lodernden Flammen. Umher liegen erschlagene Mönche in ihrem eigenen Blut. Womöglich kniet noch einer der Kirchenmänner im hohen Gras und erhebt, um sein Leben flehend, die gefalteten Hände zum Himmel. Über und neben ihm sieht man hochgewachsene, bärtige Männer in Kettenhemden mit Schwertern und Äxten bewaffnet. In ihren Armen tragen sie Unmengen an Gegenstände aus Gold – Kelche, Schalen, Kreuze, Kerzenleuchter und einen Krummstab – zum nahegelegenen Strand. Dort wartet schon das Drachenboot mit seinen rot-weiß gestreiften Segeln, um die Krieger aufzunehmen und in ihre kalte Heimat im hohen Norden zurückzubringen. Ein Wikingerüberfall… so oder so ähnlich wird er in vielen populär-wissenschaftlichen Darstellungen oder historischen Jugendbuchreihen gerne ins Bild gebannt. Die Goldgier und Mordlust der Nordmänner sind hierbei die zentralen Motive. Aber wie sehen „Wikingerschätze“ in der archäologischen Realität aus und warum sind sie ein Glückfall für den modernen Geldhistoriker?
description: Mittelalter Digital, Bd. 1 Nr. 2 (2020): Wikinger und Normannen
Das Mittelalter und seine Rezeption: Medievalism
Creators: name: Huss, Nicolas
Publisher: name: Mittelalter Digital
Year: 2021

description: Wer Geschichte sagt, muss auch Vergangenheit sagen. Diesen Satz gilt es zu internalisieren, wenn wir über „Geschichte“ und „Vergangenheit“ sprechen. Vor allem gilt er dann, wenn wir die „Vergangenheit“ nutzen – sei es im privaten, akademischen oder öffentlichen Raum. Insbesondere die Epoche des Mittelalters ist wie keine andere Epoche erfunden und umgedeutet worden, um sie dann wieder neu zu erfinden. Das „Mittelalter“ und die Menschen, die sich der Epoche widmen, bedingen sich gegenseitig. Zur Annäherung an dieses Zusammenspiel von Menschen und historischer Epoche – also wie das Mittelalter adaptiert, rezipiert und inszeniert wird – hat sich in der englischsprachigen Forschung der Begriff Medievalism etabliert. Dieser liefert uns Struktur und Klarheit, wenn wir darüber sprechen, wie und warum bestimmte Personen, Gruppen, Institutionen oder Medien „das Mittelalter“ nutzen. Methodisch, könnte man sagen, befindet sich die Medievalism-Forschung in der Nachbarschaft der Public-History sowie der Geschichtsdidaktik, besitzt aber auch einen stark kulturtheoretischen Zuschnitt. Im Folgenden wollen wir uns den einzelnen Facetten der Mittelalterrezeption widmen. Die Beispiele stammen dafür vor allem aus der sogenannten „Wikinger-Zeit“.
description: Mittelalter Digital, Bd. 1 Nr. 2 (2020): Wikinger und Normannen
"Wikinger" in der altnordischen Literatur
Creators: name: Stankovitsová, Zuzana
Publisher: name: Mittelalter Digital
Year: 2021

description: Der heutigen allgemeinen Auffassung nach sind Wikinger gleichbedeutend mit den Bewohnern Skandinaviens während der sogenannten Wikingerzeit (8.-11. Jh., üblicherweise datiert vom Überfall auf das Kloster Lindisfarne im Jahre 793 bis zur Schlacht von Stamford Bridge in 1066 datiert). Doch waren alle Skandinavier Wikinger? Haben sie sich selbst so bezeichnet? Was bedeutet die Bezeichnung überhaupt? Im Folgenden werfen wir einen Blick auf das altnordische Wort víkingr und erkunden, welches Bild sich uns in der mittelalterlichen Literatur Skandinaviens darbietet, die eine der wichtigsten Quellen für das Mittelalter im Norden darstellt.
description: Mittelalter Digital, Bd. 1 Nr. 2 (2020): Wikinger und Normannen
Smart Money: The Forecasting Ability of CFTC Large Traders in Agricultural Futures Markets
Creators: name: Sanders, Dwight R.
name: Irwin, Scott H.
name: Merrin, Robert P.
name: Sanders, Dwight R.
name: Irwin, Scott H.
name: Merrin, Robert P.
Publisher: name: Unknown
Year: 2009
Subjects: subject: Agribusiness
subject: Agricultural Finance
subject: agricultural futures markets
subject: commitments of traders
subject: forecasting
subject: prices

description: The forecasting content of the Commodity Futures Trading Commission’s Commitments of Traders (COT) report is investigated. Bivariate Granger causality tests show very little evidence that traders’ positions are useful in forecasting (leading) returns in 10 agricultural futures markets. However, there is substantial evidence that traders respond to price changes. In particular, noncommercial traders display a tendency for trend following. The other trader classifications display mixed styles, perhaps indicating those trader categories capture a variety of traders. The results generally do not support use of the COT data in predicting price movements in agricultural futures markets.
Wikinger und Normannen: Eine Einleitung
Creators: name: Enseleit, Tobias
Publisher: name: Mittelalter Digital
Year: 2021

description: Unheil versprechende Drachenboote, bärtige Mordbuben, metgeschwängerte Nächte, tapfere Schildmaiden, Mord und Todschlag – kein mittelalterliches Themenfeld erfreut sich gesamtgesellschaftlich derzeit so großer Beliebtheit wie die Wikinger und Normannen. Die gesamte Medienlandschaft wird von ihnen heimgesucht: ›The Last Kingdom‹ und ›Vikings‹ fesseln seit Jahren Serienfans, zahlreiche unbekanntere Produktionen überschwemmen in ihrem Fahrwasser die Filmsparte, mit ›Assassin’s Creed: Valhalla‹ steht brandaktuell die Videospiellandschaft in Flammen und in einer regen Reenactment-Community wird das Frühmittelalter wieder zum Leben erweckt. Das Interesse an Wikingern und Normannen und die Beschäftigung mit ihnen ist groß. Wir nähern uns ausgehend vom populärkulturellen Diskurs überblicksartig dem Thema.
description: Mittelalter Digital, Bd. 1 Nr. 2 (2020): Wikinger und Normannen
Vectorlike representation of one-dimensional scattering
Creators: name: Sanchez-Soto, L. L.
name: Carinena, J. F.
name: Barriuso, A. G.
name: Monzon, J. J.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Quantum Physics (quant-ph)
subject: Physics Education (physics.ed-ph)
subject: FOS: Physical sciences

description: We present a self-contained discussion of the use of the transfer-matrix formalism to study one-dimensional scattering. We elaborate on the geometrical interpretation of this transfer matrix as a conformal mapping on the unit disk. By generalizing to the unit disk the idea of turns, introduced by Hamilton to represent rotations on the sphere, we develop a method to represent transfer matrices by hyperbolic turns, which can be composed by a simple parallelogramlike rule.
description: 8 pages, 5 figures. This paper is dedicated to Alberto Galindo the occasion of his seventieth birthday. Submitted for publication
Helmpflicht im Mittelalter (?)
Creators: name: Enseleit, Tobias
Publisher: name: Mittelalter Digital
Year: 2021

description: Langsam bewegen sich die Schlachtreihen aufeinander zu. Der Stahl von Rüstungen und Waffen glänzt im Licht der Sonne, während rhythmisches Trommeln und sonore Schlachtgesänge die Krieger beider Seiten in Wallung bringen. Vorneweg schreiten die Anführer, unvergleichliche Helden mit wallendem Haar, manche mit majestätischen Bärten, andere mit ausgefeilten Tätowierungen, wieder andere wunderschön anzusehen mit schneeweißen Zähnen und eisblauen Augen. Sie alle haben eines nicht nötig: Helm zu tragen. Eine Szene, wie sie heute in unzähligen Spielfilmen, Serien und Videospielen begegnet. Der Helm – ein optionales Modeaccessoire? Wir schauen uns an, wie die Helden unserer Medienlandschaft mit Helmen umgehen, diskutieren wie „authentisch“ dies in historischer Perspektive ist, und stellen Erklärungsmuster für dieses Phänomen vor.
description: Mittelalter Digital, Bd. 1 Nr. 2 (2020): Wikinger und Normannen
Do Transaction Costs and Risk Preferences Influence Marketing Arrangements in the Illinois Hog Industry?
Creators: name: Franken, Jason R.V.
name: Pennings, Joost M.E.
name: Garcia, Philip
name: Franken, Jason R.V.
name: Pennings, Joost M.E.
name: Garcia, Philip
Publisher: name: Unknown
Year: 2009
Subjects: subject: Livestock Production/Industries
subject: Risk and Uncertainty
subject: asset specificity
subject: contracts
subject: hogs
subject: risk attitude
subject: risk behavior
subject: risk perception
subject: transaction costs economics

description: Risk reduction and transaction costs are often used to explain contracting in the U.S. hog industry with little empirical support. Using a unified conceptual framework that draws from risk behavior and transaction cost theories, in combination with unique survey and accounting data, we demonstrate that risk preferences and asset specificity impact Illinois producers’ use of contracts and spot markets. In particular, producers’ investments in specific hog genetics and human capital are related to selection of long-term marketing contracts over spot markets. Producers who perceive greater levels of price risk and/or are more averse are more (less) likely to use contracts (spot markets).
Parameter Optimasi dan Validasi Metode Ultra Fast Liquid Chromatography
Creators: name: , Suprianto
Publisher: name: Zenodo
Year: 2018
Subjects: KCKT, HPLC, RRLC, UPLC, UFLC, Nano LC

description: Kromatografi pertama sekali diperkenalkan oleh Mikhail Tswett, seorang ahli botani Rusia yang mengembangkannya pada tahun 1903. Pigmen yang terdapat dalam daun dipisahkan dengan kolom gelas vertikal yang diisi serbuk kalsium karbonat. Pada waktu yang hampir bersamaan, D.T. Day juga menggunakan kromatografi untuk memisahkan fraksi-fraksi petroleum, namun Mikhail Tswett yang diakui sebagai penemu dan yang menjelaskan tentang proses kromatografi. Perkembangan teknik HPLC sangat pesat, sekarang sudah ada yang disebut Rapid Resolution Liquid chromatography (RRLC), Ultra Performance Liquid chromatography (UPLC), Ultra Fast Liquid chromatography (UFLC), Nano Liquid chromatography (Nano LC).
description: google-site-verification: google275d8cf3061c563c.html
Drachen im Mittelalter
Creators: name: Enseleit, Tobias
Publisher: name: Mittelalter Digital
Year: 2021

description: Die Sonne verdunkelnde Schwingen, Zähne scharf und lang wie Schwerter und ein Atem wie Feuer, geschützt durch einen Panzer stahlharter Schuppen, gebettet auf einem Hort von Gold und Edelsteinen, nur überwindbar von den tapfersten Helden: Keine Kreatur ist in unserer Vorstellungswelt heute so eng verbunden mit dem Mittelalter wie der Drache. Woher stammen diese Vorstellungen? Und wie stellten sich die Menschen des Mittelalters diese Kreatur vor?
description: Mittelalter Digital, Bd. 1 Nr. 1 (2020)
Small molecule activation by diamidophosphine complexes of vanadium, niobium and tantalum
Creators: name: Shaver, Michael Patrick
Publisher: name: University of British Columbia
Year: 2009

description: A series of diamidophosphine ligand precursors, abbreviated [sup RR'][NPN]Li₂(S) (where [NPN] = (R'NSiMe₂CH₂)₂PR; R = Ph, Cy; R' = Ph, Mes, Me; S = THF, Et₂O, dioxane), were isolated in high yield. These ligands stabilize reactive complexes of the group five metals vanadium, niobium and tantalum. The sensitivity of these ligands to oxygen and water was illustrated by the reaction of [sup CyPh][NPN]Li₂(OEt₂) with H₂O to form [sup CyPh][NPN]Li₃)O. In this complex, two equivalents of [NPN] sandwich in situ formed Li₂O. [The rest of the abstract can be found in the attached PDF file]
Labor Pains: Valuing Seasonal versus Year-Round Labor on Organic Farms
Creators: name: Lohr, Luanne
name: Park, Timothy A.
name: Lohr, Luanne
name: Park, Timothy A.
Publisher: name: Unknown
Year: 2009
Subjects: subject: Labor and Human Capital
subject: elasticity of complementarity
subject: labor management
subject: organic farming
subject: returns to scale
subject: seasonal workers

description: Although organic farm activities seem to demand year-round employees, seasonal workers dominate the organic labor market. We use the elasticity of complementarity to assess input substitutability and predict adjustments. Farm size and farm workers are complementary inputs. Incentives that encourage farmers to expand employment of year-round and seasonal workers raise the marginal product and rates of return to organic acreage in relative wage payments. A commitment to local sales reduces organic farm incomes. A shift to local sales leads to decreased use of seasonal workers but at higher wages, with smaller adjustments in the wages of year-round workers.
Gender Bias Claims in Farm Service Agency’s Lending Decisions
Creators: name: Escalante, Cesar L.
name: Epperson, James E.
name: Raghunathan, Uthra
name: Escalante, Cesar L.
name: Epperson, James E.
name: Raghunathan, Uthra
Publisher: name: Unknown
Year: 2009
Subjects: subject: Labor and Human Capital
subject: class-action suit
subject: credit risk
subject: creditworthiness
subject: gender discrimination
subject: Heckman selection
subject: instrumental variable probit

description: This study analyzes the courts’ denial of women farmers’ motion for class-action certification of their lawsuits alleging gender discrimination in Farm Service Agency (FSA) lending decisions. The plaintiffs’ claim of “commonality” of circumstances in women farmers’ dealings with FSA is tested using a four-year sampling of Georgia FSA loan applications. The econometric framework has been developed after accounting for the separability of loan approval and amount decisions, as well as endogeneity issues through instrumental variable estimation. This study’s results do not produce overwhelming evidence of gender bias in FSA loan approval decisions and in favor of the “commonality” argument among Georgia FSA farm loan applicants.
Der Tannhäuser
Creators: name: Enseleit, Tobias
Publisher: name: Mittelalter Digital
Year: 2021

description: Was wissen wir heute über Menschen des Mittelalters? Und wie kommt dieses Wissen zustande? Auf welche Weise gelangt man von mittelalterlichen Quellen zu einer Antwort auf die Frage: „Wie war es früher wirklich?“ Und lässt sich diese Frage überhaupt beantworten? Heften wir uns an die Fersen eines Dichters und Sängers des 13. Jahrhunderts, der Frauenheld und Kreuzritter gewesen sein soll, durch Richard Wagners Oper bis heute einen Namen hat und an dessen Beispiel wir viel über Herausforderungen und Probleme bei der Beschäftigung mit mittelalterlicher Literatur lernen können – des Tannhäusers.
description: Mittelalter Digital, Bd. 1 Nr. 1 (2020)