cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Leptonic and charged kaon decay modes of the $ϕ$ meson measured in heavy-ion collisions at the CERN SPS
Creators: name: Adamova, D.
name: Collaboration, CERES
Publisher: name: arXiv
Year: 2005
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: We report a measurement of $ϕ$ meson production in central Pb+Au collisions at E$_{lab}$/A=158 GeV. For the first time in heavy-ion collisions, $ϕ$ mesons were reconstructed in the same experiment both in the K$^+$K$^-$ and the dilepton decay channel. Near mid-rapidity, this yields rapidity densities, corrected for production at the same rapidity value, of 2.05 +- 0.14(stat) +- 0.25(syst) and 2.04 +- 0.49(stat)+-{0.32}(syst), respectively. The shape of the measured transverse momentum spectra is also in close agreement in both decay channels. The data rule out a possible enhancement of the $ϕ$ yield in the leptonic over the hadronic channel by a factor larger than 1.6 at 95% CL.
description: 11 pages, 4 figures,submitted to Phys. Rev. Lett
Effect of Temperature on Gasification Performance of Biomass in a Bubbling Fluidized Bed Gasifier
Creators: name: Das, Bijoy
Publisher: name: figshare
Year: 2020
Subjects: subject: 91305 Energy Generation, Conversion and Storage Engineering
subject: FOS: Mechanical engineering

description: The gasification performance in a bubbling fluidized bed has been evaluated based on the quality of syngas and tar produced in the process. A reactor network model (RNM) is solved for pyrolysis, gasification, and freeboard zone. Two computation codes; HSC Chemistry for thermodynamic and Perfectly Stirred Reactor (PSR) for kinetic simulations of the pyrolysis process are used for pyrolysis modeling. Pyrolysis gases are further reacted in the PSR of the gasification zone in the presence of air. The residual reaction in the freeboard zone is modeled as a plug flow reactor (PFR). The simulation model is solved for three different temperatures and at a fixed equivalence ratio (ER) of 0.19 for predicting the effect of temperature on the quality of syngas and tar concentrations. The result at 739.4 °C gasifier temperature is validated with the experimental results from the literature. It is observed that the syngas quality increases and total tarconcentration decrease with the increase of gasification temperature.
Wearable camera-based human absolute localization in large warehouses
Creators: name: Écorchard, Gaël
name: Košnar, Karel
name: Přeučil, Libor
Publisher: name: arXiv
Year: 2020
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences
subject: I.1.4; I.1.5

description: In a robotised warehouse, as in any place where robots move autonomously, a major issue is the localization or detection of human operators during their intervention in the work area of the robots. This paper introduces a wearable human localization system for large warehouses, which utilize preinstalled infrastructure used for localization of automated guided vehicles (AGVs). A monocular down-looking camera is detecting ground nodes, identifying them and computing the absolute position of the human to allow safe cooperation and coexistence of humans and AGVs in the same workspace. A virtual safety area around the human operator is set up and any AGV in this area is immediately stopped. In order to avoid triggering an emergency stop because of the short distance between robots and human operators, the trajectories of the robots have to be modified so that they do not interfere with the human. The purpose of this paper is to demonstrate an absolute visual localization method working in the challenging environment of an automated warehouse with low intensity of light, massively changing environment and using solely monocular camera placed on the human body.
description: Conference paper presented at Twelfth International Conference on Machine Vision, 2019
Natural three-qubit interactions in one-way quantum computing
Creators: name: Tame, M. S.
name: Paternostro, M.
name: Kim, M. S.
name: Vedral, V.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Quantum Physics (quant-ph)
subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: We address the effects of natural three-qubit interactions on the computational power of one-way quantum computation (\QC). A benefit of using more sophisticated entanglement structures is the ability to construct compact and economic simulations of quantum algorithms with limited resources. We show that the features of our study are embodied by suitably prepared optical lattices, where effective three-spin interactions have been theoretically demonstrated. We use this to provide a compact construction for the Toffoli gate. Information flow and two-qubit interactions are also outlined, together with a brief analysis of relevant sources of imperfection.
description: 4 pages, 3 figures, RevTeX4
THE IMPORTANCE OF THE FAMILY IN EDUCATION OF PRESCHOOL CHILDREN
Creators: name: Bakhtiyorova, Markhabo
Publisher: name: Zenodo
Year: 2024

description: This article analyzes the role and importance of the family in the education of preschool children. It is shown that educational processes formed in the family environment are of decisive importance in the development of children as individuals. The formation of the child under the influence of social, psychological and emotional factors within the family in the first years, the impact on his future educational processes and social adaptation is analyzed. At the same time, it will be explained how the participation of family members, especially parents, in the process of education and education affects the cognitive development of children. The article also includes recommendations developed on the basis of scientific evidence about the leading role of the family in the education of children and the importance of cooperation with teachers.
COOPERATIVE MARKETING IN SPECIALTY GRAINS AND IDENTITY PRESERVED GRAIN MARKETS
Creators: name: Janzen, Edward L.
name: Wilson, William W.
name: Janzen, Edward L.
name: Wilson, William W.
Publisher: name: Unknown
Year: 2002
Subjects: subject: Agribusiness
subject: identity preservation
subject: IP
subject: segregation
subject: traceability
subject: specialty products
subject: genetically modified
subject: GM
subject: non-GM
subject: cooperative
subject: alliance.

description: Marketing of specialty and identity preserved grains has become an important strategy in the grain marketing industry and is being driven, in part, by consumer and processor demand and an interest in non-GM products. This study provides background and practices of numerous organizations involved in marketing of specialty/identity preserved grains. Supporting marketing activities are reviewed. Key factors in the success (or failure) of their efforts are identified. Major challenges facing the participants in the specialty/IP grain marketing industry are discussed. The primary focus is on the role of agricultural cooperatives and producer owned alliances.
Determining the dynamics and magnetic fields in He I 10830 Å during a solar filament eruption
Creators: name: Kuckein, C.
name: Manrique, S. J. González
name: Kleint, L.
name: Ramos, A. Asensio
Publisher: name: arXiv
Year: 2020
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We investigate the dynamics and magnetic properties of the plasma, such as line-of-sight velocity (LOS), optical depth, vertical and horizontal magnetic fields, belonging to an erupted solar filament. The filament eruption was observed with the GREGOR Infrared Spectrograph (GRIS) at the 1.5-meter GREGOR telescope on 2016 July 3. Three consecutive full-Stokes slit-spectropolarimetric scans in the He I 10830 Å spectral range were acquired. The Stokes I profiles were classified using the machine learning k-means algorithm and then inverted with different initial conditions using the HAZEL code. The erupting-filament material presents the following physical conditions: (1) ubiquitous upward motions with peak LOS velocities of ~73 km/s; (2) predominant large horizontal components of the magnetic field, on average, in the range of 173-254 G, whereas the vertical components of the fields are much lower, on average between 39-58 G; (3) optical depths in the range of 0.7-1.1. The average azimuth orientation of the field lines between two consecutive raster scans (<2.5 minutes) remained constant. The analyzed filament eruption belonged to the fast rising phase, with total velocities of about 124 km/s. The orientation of the magnetic field lines does not change from one raster scan to the other, indicating that the untwisting phase has not started yet. The untwisting seems to start about 15 min after the beginning of the filament eruption.
description: Accepted for publication in Astronomy & Astrophysics, 12 pages, 13 figures, 1 appendix, 2 online movies
A Class of Parameter Dependent Commuting Matrices
Creators: name: Shastry, B Sriram
Publisher: name: arXiv
Year: 2005
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Other Condensed Matter (cond-mat.other)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: We present a novel class of real symmetric matrices in arbitrary dimension $d$, linearly dependent on a parameter $x$. The matrix elements satisfy a set of nontrivial constraints that arise from asking for commutation of pairs of such matrices for all $x$, and an intuitive sufficiency condition for the solvability of certain linear equations that arise therefrom. This class of matrices generically violate the Wigner von Neumann non crossing rule, and is argued to be intimately connected with finite dimensional Hamiltonians of quantum integrable systems.
description: Latex, Added References, Typos corrected
INCENTIVE CONTRACTS TO MEET FUNCTIONAL CHARACTERISTICS IN WHEAT PURCHASING -- SUMMARY
Creators: name: Wilson, William W.
name: Maxwell, Brett J.
name: Dahl, Bruce L.
name: Wilson, William W.
name: Maxwell, Brett J.
name: Dahl, Bruce L.
Publisher: name: Unknown
Year: 2004
Subjects: subject: Crop Production/Industries
subject: Incentive Contact
subject: Functional Characteristic
subject: Wheat
subject: Principal-Agent

description: Consistency of functional characteristics in hard red spring (HRS) wheat is a concern confronting sellers and buyers. This research analyzes contract incentives for importers with respect to cost and potential risk of acceptance. A principal-agent framework is utilized to examine contract incentives. In the principal-agent contract, the principal offers the contract, the agent rejects or accepts the contract, and then decides how much effort to apply. All this is subject to risk for the agent and moral hazard for the principal. An example is presented, for which equilibrium contract terms are a base price of 454 cents per bushel for low quality wheat and a premium of 36 cents per bushel if high quality is achieved. The premium for high quality is unchanged as the agent's outside option increases, but increases as the probability of conformance with high effort declines or as the agent's cost of high effort increases. Small changes in several of the parameter values (agent's outside option, agent's cost of high/low effort, principal value for high/low effort, and principal's outside options if the contract was not extended or if the agent rejects the contract) result in the principal not offering a contract.
Constraining dense matter physics using f-mode oscillations in neutron stars
Creators: name: Jaiswal, Sukrit
name: Chatterjee, Debarati
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: In this undergraduate project, f-mode oscillations in neutron stars are used to constrain the equation of state of dense matter. For the first time, a systematic investigation of the role of nuclear saturation parameters on the mode oscillations is performed. It is found that the uncertainty in the determination of effective nucleon mass plays the most significant role in controlling the f-mode frequencies. Correlations of the frequencies with astrophysical observables relevant for asteroseismology are also investigated. Future detection of f-mode frequencies could then provide a unique way of constraining nuclear empirical parameters and therefore the behaviour of dense matter.
description: 18 pages, 18 figures
Sabkha Ecosystem
Creators: name: Chatziefthimiou, Dr. Aspa
Publisher: name: Manara - Qatar Research Repository
Year: 2025
Subjects: classificationCode: 31
subject: Biological sciences
subject: FOS: Biological sciences
classificationCode: 3103
subject: Ecology
classificationCode: 37
subject: Earth sciences
classificationCode: 3701
subject: Atmospheric sciences
classificationCode: 3702
subject: Climate change science
classificationCode: 3707
subject: Hydrology
classificationCode: 3708
subject: Oceanography
subject: FOS: Earth and related environmental sciences
classificationCode: 39
subject: Education
classificationCode: 3901
subject: Curriculum and pedagogy
classificationCode: 41
subject: Environmental sciences
classificationCode: 4101
subject: Climate change impacts and adaptation

description: The morphology of the sabkha’s surface (how it looks like) depends on the types and frequency of the waters that run through it, the particles and organisms that tidal-floods deposit on it, and on the atmospheric temperature. The highest salinity edge of the sabkha, usually receives subterranean (underground) seawater flow and low levels of rainwater. It is made out of sediment that, when one walks on it, feels like quick sinking sand. When water gets evaporated by the hot rays of the sun, white salt crystals are left behind, and only the hardiest microbes and no other organisms are able to survive. The Salt Lake in Utah, USA, has a similar look to our white sabkhat in Qatar and the Gulf. In edges that only receive tiny amounts of rainwater, the sabkha is sandy, yellowish, and dry. The Gulf sand gecko may be the only reptile observed in the edges of sabkhat. Its swollen fingers and elongated spiny scales on the underside are thought to be direct adaptations to life in this ecosystem. As we move towards areas that get tidal floods, the sabkha surface becomes darker and wavy but dry most of the time, and as we get close to the intertidal, the sabkha is lined with leathery-to-the-touch microbial mats.Other InformationPublished in: Qatar Marine Ecosystem lesson plans
License: https://creativecommons.org/licenses/by-nc-nd/4.0/
See educational resource on publisher's website: https://www.earthna.qa/publications/educational-materials/qatar-marine-ecosystem-lesson-plans
Editor: Ruba Hinnawi
Editorial board: Dr. Gonzalo Castro de la Mata, Sebastien P. Turbot, Dr. Alexandre Amato, Nihal. Mohamed Al-Saleh, Dr. Mona Matar Al-Kuwari
Project Identifier (PI): EEF-2023-003
Chiral plasmons with twisted atomic bilayers
Creators: name: Lin, Xiao
name: Liu, Zifei
name: Stauber, Tobias
name: Gómez-Santos, Guillermo
name: Gao, Fei
name: Chen, Hongsheng
name: Zhang, Baile
name: Low, Tony
Publisher: name: arXiv
Year: 2020
Subjects: subject: Optics (physics.optics)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Van der Waals heterostructures of atomically thin layers with rotational misalignments, such as twisted bilayer graphene, feature interesting structural moiré superlattices. Due to the quantum coupling between the twisted atomic layers, light-matter interaction is inherently chiral; as such, they provide a promising platform for chiral plasmons in the extreme nanoscale. However, while the interlayer quantum coupling can be significant, its influence on chiral plasmons still remains elusive. Here we present the general solutions from full Maxwell equations of chiral plasmons in twisted atomic bilayers, with the consideration of interlayer quantum coupling. We find twisted atomic bilayers have a direct correspondence to the chiral metasurface, which simultaneously possesses chiral and magnetic surface conductivities, besides the common electric surface conductivity. In other words, the interlayer quantum coupling in twisted van der Waals heterostructures may facilitate the construction of various (e.g., bi-anisotropic) atomically-thin metasurfaces. Moreover, the chiral surface conductivity, determined by the interlayer quantum coupling, determines the existence of chiral plasmons and leads to a unique phase relationship (i.e., +/-π/2 phase difference) between their TE and TM wave components. Importantly, such a unique phase relationship for chiral plasmons can be exploited to construct the missing longitudinal spin of plasmons, besides the common transverse spin of plasmons.
description: 16 pages, 3 figures
From Farmers to Farm Firms - Some Recent Changes in Norwegian Politics and Implications for Agricultural Statistics
Creators: name: Hegrenes, Agnar
name: Bye, Anne Snellingen
name: Hegrenes, Agnar
name: Bye, Anne Snellingen
Publisher: name: Unknown
Year: 2005
Subjects: subject: Agricultural and Food Policy
subject: Agricultural statistics
subject: agricultural units
subject: Norway
subject: organisational forms
subject: register data

description: This paper was inspired by some changes in the criteria for being entitled to subsidies in Norwegian agriculture, and the changes this induced in agricultural statistics. Although the paper is concerned with Norway only, the Norwegian experiences might be of interest to a broader audience. It illustrates some of the challenges which can occur when statistics is based on register data, and the register owner make changes in the criteria and thus in the information gathered.
New York Times Upshot/Siena College: November 2018 Michigan 08 Poll
Creators: name: New York Times
Publisher: name: Roper Center for Public Opinion Research
Year: 2021

description: Likelihood of voting in 2018 election (2); vote for Democrat/Republican for Congress (1); Michigan Congressional District 08 (1); Democratic Candidate Elissa Slotkin (1); Republican Candidate Mike Bishop (1); opinion of various public figures (2); respondent would like Democrats/Republicans to control House of Representatives (1); President Donald Trump job performance (1); political partisanship (1).
Les discours à caractère christologique et leur appartenance aux Isaac (d'Antioche)
Creators: name: Bou-Mansour, Tanios
Publisher: name: Oriens christianus : Hefte für die Kunde des christlichen Orients
Year: 2024

description: Oriens christianus : Hefte für die Kunde des christlichen Orients, Bd. 89 (2005): Oriens christianus, Band 89
Tracing the networks of postmodernity : media and technology in the novels of Martin Amis and Don Delillo
Creators: name: Thomson, D.
Publisher: name: University of British Columbia
Year: 2009

description: This study discusses works by Martin Amis and Don DeLillo in the context of several key scientific and technological transformations that occur in the aftermath of the Second World War. I begin by revisiting one of the most-discussed aspects of DeLillo's work: the currents conspiracy and paranoia that recur in his novels and, he claims, pervade the wider culture. By demonstrating how paranoid narratives strive to accommodate contemporary technologies, I create a context in which the paranoia addressed in works such as Libra and Underworld becomes intelligible as a response to the specific technological character of surveilance and control in the post-War period. The sciences of information and cybernetics also cohere in the years folowing the War, and the second chapter explores the creative tension between metaphors of entropy and information in Amis's fiction as wel as DeLillo's. The third chapter focuses on television as a constitutive element of postmodernity, and traces how DeLillo and Amis adopt narrative strategies that enable them to represent subjects who have grown accustomed to living within an environment mediated, to an unprecedented degree, by visual imagery supplied by or formatted for television. Another product of postmodern technology, commercial air travel reconfigures relationships to place and to time for inhabitants of industrialized countries. Both the liberating and limiting consequences of living in the latter half of the century of flight are addressed in the fourth chapter. The final chapter offers an assessment of the role contemporary media and technology play in establishing the characteristics associated with postmodernity, and concludes with a brief discussion of the role the internet might play within the context of the specific technologies discussed in the body of the thesis.
Design and Control of Steam Flow in Cement Production Process using Neural Network Based Controllers
Creators: name: Jibril, Mustefa
name: Tadese, Messay
name: Tadese, Eliyas Alemayehu
Publisher: name: arXiv
Year: 2020
Subjects: subject: Systems and Control (eess.SY)
subject: Signal Processing (eess.SP)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: In this paper a NARMA L2, model reference and neural network predictive controller is utilized in order to control the output flow rate of the steam in furnace by controlling the steam flow valve. The steam flow control system is basically a feedback control system which is mostly used in cement production industries. The design of the system with the proposed controllers is done with Matlab/Simulink toolbox. The system is designed for the actual steam flow output to track the desired steam that is given to the system as input for two desired steam input signals (step and sine wave). In order to analyze the performance of the system, comparison of the proposed controllers is done by simulating the system for the two reference signals for the system with and without sensor noise disturbance. Finally the comparison results prove the effectiveness of the presented process control system with model reference controller.
Analysing Variation in Russian Dairy Farms, 1990-2001
Creators: name: Bezlepkina, Irina V.
name: Huirne, Ruud B.M.
name: Oude Lansink, Alfons G.J.M.
name: Oskam, Arie J.
name: Bezlepkina, Irina V.
name: Huirne, Ruud B.M.
name: Oude Lansink, Alfons G.J.M.
name: Oskam, Arie J.
Publisher: name: Unknown
Year: 2005
Subjects: Livestock Production/Industries

description: Russian dairy enterprises underwent dramatic changes during 1990-2001. Not much is known about the position of these enterprises under the new conditions. This study examined a sample group of dairy enterprises in the Moscow region to try to identify similarities and divergences in historical background, performance, managerial and structural characteristics. A unique farm-level data set from 1990-2001 was used. Assessment of historical characteristics revealed that the currently most successful enterprises were those which in pre-reform years had already shown better economic performance. These farms also had, for the period studied, smaller percentages of reduced resources, no severe debt problems, and better overall management.
Additional file 1 of Using the Delphi technique to determine objectives and topical outline for a pharmaceutical care course: an experience from the Cuban higher education system
Creators: name: Martínez-Sánchez, Alina M.
Publisher: name: figshare
Year: 2021
Subjects: subject: Pharmacology
subject: Sociology
subject: FOS: Sociology
subject: 69999 Biological Sciences not elsewhere classified
subject: FOS: Biological sciences
subject: Science Policy

description: Additional file 1. Appendix 1. Definition of domains and items used in the questionnaire layout. Appendix 2. Final list consensus objectives related to topical outlines for undergraduate in pharmaceutical course.
A Determination of Electroweak Parameters at HERA
Creators: name: H1 Collaboration
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: Using the deep inelastic e^+p and e^-p charged and neutral current scattering cross sections previously published, a combined electroweak and QCD analysis is performed to determine electroweak parameters accounting for their correlation with parton distributions. The data used have been collected by the H1 experiment in 1994-2000 and correspond to an integrated luminosity of 117.2 pb^{-1}. A measurement is obtained of the W propagator mass in charged current ep scattering. The weak mixing angle sin^2 theta_W is determined in the on-mass-shell renormalisation scheme. A first measurement at HERA is made of the light quark weak couplings to the Z^0 boson and a possible contribution of right-handed isospin components to the weak couplings is investigated.
description: 16 pages, 3 figures, 2 tables
Self-Efficacy Mahasiswa Prodi PMA Dalam Pembelajaran Kalkulus
Creators: name: Irwansyah, Budi
Publisher: name: figshare
Year: 2020
Subjects: subject: 10504 Mathematical Aspects of General Relativity
subject: FOS: Mathematics

description: Tulisan sederhana ini bertujuan untuk menganalisis dan mendeskripsikan Self-efficacy mahasiswa Prodi PMA unit Unggulan dalam pembelajaran Kalkulus. Self-efficacy yang dimaksud adalah ditinjau dari setiap dimensi; Magnitude, Strength, dan Generality. Penilaian self-efficacy mendorong individu (mahasiswa) menghindari situasi yang diyakini melampaui kemampuannya atau melakukan kegiatan yang diperkirakan dapat diatasinya. Berdasarkan pengukuran, diperoleh beberapa hasil, yaitu; bahwa secara total self-efficacy mahasiswa PMA unit Unggulan berkategori sedang. Persentase mahasiswa pada setiap kategori self-efficacy, secara berturut-turut berkategori sebagai berikut: 9,375% sangat rendah (SR), 37,5% rendah (R), 34,375% sedang (S), 15,625% tinggi (T) dan sisanya 3,125% termasuk kategori sangat tinggi (ST). Kondisi tersebut mungkin disebabkan faktor budaya yang luput dari perhatian. Sifat takut sebagai salah satu karakteristik budaya mahasiswa Langsa, seringkali menyebabkan suasana akademik menjadi kurang kompetitif, banyak mahasiswa yang enggan menunjukkan keyakinan atas kemampuan dirinya karena takut dianggap sombong atau sok pintar. Self-efficacy yang ditelaah pada pengukuran ini merupakan self-efficacy yang terkait dengan kemampuan penyelesaian soal matematis (Kalkulus).
Molecular anchoring stabilizes low valence Ni(I)TPP on copper against thermally induced chemical changes
Creators: name: Sturmeit, Henning Maximilian
name: Cojocariu, Iulia
name: Jugovac, Matteo
name: Cossaro, Albano
name: Verdini, Alberto
name: Floreano, Luca
name: Sala, Alessandro
name: Comelli, Giovanni
name: Moro, Stefania
name: Stredansky, Matus
name: Corva, Manuel
name: Vesselli, Erik
name: Puschnig, Peter
name: Schneider, Claus Michael
name: Feyer, Vitaliy
name: Zamborlini, Giovanni
name: Cinchetti, Mirko
Publisher: name: arXiv
Year: 2020
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Many applications of molecular layers deposited on metal surfaces, ranging from single-atom catalysis to on-surface magnetochemistry and biosensing, rely on the use of thermal cycles to regenerate the pristine properties of the system. Thus, understanding the microscopic origin behind the thermal stability of organic/metal interfaces is fundamental for engineering reliable organic-based devices. Here, we study nickel porphyrin molecules on a copper surface as an archetypal system containing a metal center whose oxidation state can be controlled through the interaction with the metal substrate. We demonstrate that the strong molecule-surface interaction, followed by charge transfer at the interface, plays a fundamental role in the thermal stability of the layer by rigidly anchoring the porphyrin to the substrate. Upon thermal treatment, the molecules undergo an irreversible transition at 420 K, which is associated with an increase of the charge transfer from the substrate, mostly localized on the phenyl substituents, and a downward tilting of the latters without any chemical modification
Quadrilateral meshes for PSLGs
Creators: name: Bishop, Christopher J.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Computational Geometry (cs.CG)
subject: Complex Variables (math.CV)
subject: FOS: Computer and information sciences
subject: FOS: Mathematics
subject: 68U05 (primary) 52B55, 68Q25 (secondary)

description: We prove that every planar straight line graph with $n$ vertices has a conforming quadrilateral mesh with $O(n^2)$ elements, all angles $\leq 120^\circ$ and all new angles $\geq 60^\circ$. Both the complexity and the angle bounds are sharp. Moreover, all but $O(n)$ of the angles may be taken in a smaller interval, say $[89^\circ, 91^\circ]$.
description: 55 pages, 39 figures
Additional file 1 of Hidden bedside rationing in the Netherlands: a cross-sectional survey among physicians in internal medicine
Creators: name: Ruijter, Ursula W. De
name: Lingsma, Hester F.
name: Bax, Willem A.
name: Legemaate, Johan
Publisher: name: figshare
Year: 2021
Subjects: subject: Medicine
subject: Science Policy
subject: 111714 Mental Health
subject: FOS: Health sciences

description: Additional file 1. English Translation of Standardised Open Invitation to Participate.
Land Market With Fragmented Landownership Rights in Bulgaria: An Institutional Approach
Creators: name: Dirimanova, Violeta
name: Dirimanova, Violeta
Publisher: name: Unknown
Year: 2005
Subjects: subject: Land Economics/Use
subject: Bulgaria
subject: Contractual arrangements
subject: Land fragmentation
subject: Land market
subject: Land transactions
subject: Property rights

description: The land restitution in Bulgaria led to a severe fragmentation in land ownership. This has an impact on the agricultural development and land market. The article investigates the land transactions on the sale and rentals markets. In order to explain the processes three new institutional economic theories will be employed: property rights theory, transaction costs theory and agricultural contract theory. First, the article reviews the appropriateness of each theory, and second, results of conducted survey in two regions of Bulgaria with different degrees of land fragmentation. Key words: Bulgaria, Contractual arrangements, Land fragmentation, Land market, Land transactions, Property rights
Scattering Equations in AdS: Scalar Correlators in Arbitrary Dimensions
Creators: name: Eberhardt, Lorenz
name: Komatsu, Shota
name: Mizera, Sebastian
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We introduce a bosonic ambitwistor string theory in AdS space. Even though the theory is anomalous at the quantum level, one can nevertheless use it in the classical limit to derive a novel formula for correlation functions of boundary CFT operators in arbitrary space-time dimensions. The resulting construction can be treated as a natural extension of the CHY formalism for the flat-space S-matrix, as it similarly expresses tree-level amplitudes in AdS as integrals over the moduli space of Riemann spheres with punctures. These integrals localize on an operator-valued version of scattering equations, which we derive directly from the ambitwistor string action on a coset manifold. As a testing ground for this formalism we focus on the simplest case of ambitwistor string coupled to two current algebras, which gives bi-adjoint scalar correlators in AdS. In order to evaluate them directly, we make use of a series of contour deformations on the moduli space of punctured Riemann spheres and check that the result agrees with tree level Witten diagram computations to all multiplicity. We also initiate the study of eigenfunctions of scattering equations in AdS, which interpolate between conformal partial waves in different OPE channels, and point out a connection to an elliptic deformation of the Calogero-Sutherland model.
description: 44 pages; v2 References added. Modified discussion of anomalies in sections 2 and 3. Main results unchanged
Transport equations and perturbations of boundary conditions
Creators: name: Tyran-Kamińska, Marta
Publisher: name: arXiv
Year: 2020
Subjects: subject: Functional Analysis (math.FA)
subject: Analysis of PDEs (math.AP)
subject: Probability (math.PR)
subject: FOS: Mathematics
subject: 35F46, 47D06, 60J25, 82C40, 82C70, 92C40

description: We provide a new perturbation theorem for substochastic semigroups on abstract AL spaces extending Kato's perturbation theorem to non-densely defined operators. We show how it can be applied to piecewise deterministic Markov processes and transport equations with abstract boundary conditions. We give particular examples to illustrate our results.
Double Pion Photoproduction from Nuclei
Creators: name: Schadmand, S.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: Differences in the photoproduction of mesons on the free proton and on nuclei are expected to reveal changes in the properties of hadrons. Inclusive studies of nuclear photoabsorption have provided evidence of medium modifications. However, the results have not been explained in a model independent way. A deeper understanding of the situation is anticipated from a detailed experimental study of meson photoproduction from nuclei in exclusive reactions. In the energy regime above the Delta(1232) resonance, the dominant double pion production channels are of particular interest. Double pion photoproduction from nuclei is also used to investigate the in-medium modification of meson-meson interactions.
description: proceedings Workshop on In-Medium Hadron Physics Giessen, Nov. 11-13, 2004
Additional file 2 of Hidden bedside rationing in the Netherlands: a cross-sectional survey among physicians in internal medicine
Creators: name: Ruijter, Ursula W. De
name: Lingsma, Hester F.
name: Bax, Willem A.
name: Legemaate, Johan
Publisher: name: figshare
Year: 2021
Subjects: subject: Medicine
subject: Science Policy
subject: 111714 Mental Health
subject: FOS: Health sciences

description: Additional file 2. English Translation of Original Dutch Survey.
Structural and Transport Properties of Li/S Battery Electrolytes: Role of the Polysulfide Species
Creators: name: Park, Chanbum
name: Ronneburg, Arne
name: Risse, Sebastian
name: Ballauff, Matthias
name: Kanduč, Matej
name: Dzubiella, Joachim
Publisher: name: arXiv
Year: 2020
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: Lithium--sulfur (Li/S) batteries are regarded as one of the most promising energy storage devices beyond lithium-ion batteries because of their high energy density of 2600 Wh/kg and an affordable cost of sulfur. Meanwhile, some challenges inherent to Li/S batteries remain to be tackled, for instance, the polysulfide (PS) shuttle effect, the irreversible solidification of Li$_2$S, and the volume expansion of the cathode material during discharge. On the molecular level, these issues originate from the structural and solubility behavior of the PS species in bulk and in the electrode confinement. In this study, we use classical molecular dynamics (MD) simulations to develop a working model for PS of different chain lengths in applied electrolyte solutions of lithium bistriflimide (LiTFSI) in 1,2-dimethoxyethane (DME) and 1,3-dioxolane (DOL) mixtures. We investigate conductivities, diffusion coefficients, solvation structures, and clustering behavior and verify our simulation model with experimental measurements available in literature and newly performed by us. Our results show that diffusion coefficients and conductivities are significantly influenced by the chain length of PS. The conductivity contribution of the short chains, like Li$_2$S$_4$, is lower than of longer PS chains, such as Li$_2$S$_6$ or Li$_2$S$_8$, despite the fact that the diffusion coefficient of Li$_2$S$_4$ is higher than for longer PS chains. The low conductivity of Li$_2$S$_4$ can be attributed to its low degree of dissociation and even to a formation of large clusters in the solution. It is also found that an addition of 1 M LiTFSI into PS solutions considerably reduces the clustering behavior. Our simulation model enables future systematic studies in various solvating and confining systems for the rational design of Li/S electrolytes.
description: 14 pages, 9 figures
Quantum theory of spectral diffusion induced electron spin decoherence
Creators: name: Witzel, W. M.
name: de Sousa, Rogerio
name: Sarma, S. Das
Publisher: name: arXiv
Year: 2005
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: A quantum cluster expansion method is developed for the problem of localized electron spin decoherence due to dipolar fluctuations of lattice nuclear spins. At the lowest order it provides a microscopic explanation for the Lorentzian diffusion of Hahn echoes without resorting to any phenomenological Markovian assumption. Our numerical results show remarkable agreement with recent electron spin echo experiments in phosphorus doped silicon.
description: 5 pages, 1 figure
Electron-phonon coupling reflecting dynamic charge inhomogeneity in copper-oxide superconductors
Creators: name: Reznik, D.
name: Pintschovius, L.
name: Ito, M.
name: Iikubo, S.
name: Sato, M.
name: Goka, H.
name: Fujita, M.
name: Yamada, K.
name: Gu, G. D.
name: Tranquada, J. M.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: The attempt to understand cuprate superconductors is complicated by the presence of multiple strong interactions. While many believe that antiferromagnetism is important for the superconductivity, there has been revived interest in the role of electron-lattice coupling. The recently studied conventional superconductor MgB2 has a very strong electron-lattice coupling, involving a particular vibrational mode (phonon), that was predicted by standard theory and confirmed quantitatively by experiment. Here we present inelastic scattering measurements that show a similarly strong anomaly in the Cu-O bond-stretching phonon in the cuprate superconductors La2-xSrxCuO4 (with x=0.07, 0.15). This is in contrast to conventional theory, which does not predict such behavior. The anomaly is strongest in La1.875Ba0.125CuO4 and La1.48Nd0.4Sr0.12CuO4, compounds that exhibit spatially modulated charge and magnetic order, often called stripe order. It occurs at a wave vector corresponding to the charge order. These results suggest that this giant electron-phonon anomaly, which is absent in undoped and over-doped non-superconductors, is associated with charge inhomogeneity. It follows that electron-phonon coupling may be important to our understanding of superconductivity, although its contribution to the mechanism is likely to be indirect.
description: to appear in Nature, 16 pages, 4 figures, very minor changes in text and figures from previous version
Low temperature heat source for power generation: Exhaustive analysis of a carbon dioxide transcritical power cycle.
Creators: name: Velez, Fredy
name: Segovia, José
name: Chejne, Farid
name: Antolín, Gregorio
name: Quijano, Ana
name: Martin, M. Carmen
Publisher: name: figshare
Year: 2024
Subjects: classificationCode: 340602
subject: Chemical thermodynamics and energetics
classificationCode: 401703
subject: Energy generation, conversion and storage (excl. chemical and electrical)

description: The main results of a theoretical work on the use of a low temperature heat source for power generation through a carbon dioxide transcritical power cycle are reported in this paper. The procedure for analyzing the behaviour of the proposed cycle consisted in modifying the input pressure to the turbine from 66 bar, maintained constant each evaluated temperature (60 ?C, 90 ?C, 120 ?C and 150 ?C) until the net work was approximately zero. As a result, the maximum exergy efficiency was 50%, while the energy efficiencies obtained were 9.8%, 7.3%, 4.9% and 2.4% and the net specific work was 18.2 kJ/kg, 12.8 kJ/kg, 7.8 kJ/kg and 3.5 kJ/kg, respectively. Furthermore, the effect of the addition of an internal heat exchanger, which obviously supposed an increase in the efficiency, was analyzed. The analysis of the proposed system shows the viability of implementing this type of process as an energy alternative and/or strengthener of non-conventional energy sources in non-provided zones, or for increasing the energy efficiency in the industry.
On algebras associated to partially ordered sets
Creators: name: Brun, Morten
name: Roemer, Tim
Publisher: name: arXiv
Year: 2005
Subjects: subject: Commutative Algebra (math.AC)
subject: Combinatorics (math.CO)
subject: FOS: Mathematics
subject: 06A11, 13C14, 13D45

description: We continue the study on sheaves of rings on finite posets. We present examples where the ring of global sections coincide with toric faces rings, quotients of a polynomial ring by a monomial ideal and algebras with straightening laws. We prove a rank-selection theorem which generalizes the well-known rank-selection theorem of Stanley-Reisner rings. Finally, we determine an explicit presentation of certain global rings of sections.
description: 14 pages
Enforcing labour rights of irregular migrants in Indonesia
Creators: name: Palmer, Wayne
name: Missbach, Antje
Publisher: name: Monash University
Year: 2020
Subjects: subject: 160303 Migration
subject: FOS: Sociology
subject: 160606 Government and Politics of Asia and the Pacific
subject: FOS: Political science

description: The multi-directional nature of labour migration flows has resulted in an increasing number of countries having become both senders and receivers of regular and irregular migrants. However, some countries continue to see themselves primarily as senders and so ignore their role as a receiving country, which can have negative implications for the rights of migrants in their territory. Using the example of Indonesia, which is State Party to the 1990 UN Convention on the Rights of All Migrant Workers and Members of Their Families, this article demonstrates that irregular migrant workers in this country have the legal right to protection against labour exploitation even when they work despite the government’s prohibition on employment. The article discusses the ‘right to work’ and how international human rights law has translated it into the ‘right to protection from labour exploitation’ for irregular migrants in Indonesia. By way of two case studies about the Indonesian government’s handling of irregular migrants, it shows how it prioritises enforcement of the immigration law over labour and employment laws much like countries that have not ratified the ICRMW. It also draws attention to legal protection gaps that emerge for asylum seekers when they are recognised to be genuine refugees.
Sabkha Ecosystem
Creators: name: Chatziefthimiou, Dr. Aspa
name: Hinnawi, Ruba
name: Castro de la Mata, Dr. Gonzalo
name: P. Turbot, Sebastien
name: Amato, Dr. Alexandre
name: Mohamed Al-Saleh, Nihal.
name: Matar Al-Kuwari, Dr. Mona
name: Cohen, Raviv
Publisher: name: Manara - Qatar Research Repository
Year: 2025
Subjects: classificationCode: 31
subject: Biological sciences
subject: FOS: Biological sciences
classificationCode: 3103
subject: Ecology
classificationCode: 37
subject: Earth sciences
classificationCode: 3701
subject: Atmospheric sciences
classificationCode: 3702
subject: Climate change science
classificationCode: 3707
subject: Hydrology
classificationCode: 3708
subject: Oceanography
subject: FOS: Earth and related environmental sciences
classificationCode: 39
subject: Education
classificationCode: 3901
subject: Curriculum and pedagogy
classificationCode: 41
subject: Environmental sciences
classificationCode: 4101
subject: Climate change impacts and adaptation

description: The morphology of the sabkha’s surface (how it looks like) depends on the types and frequency of the waters that run through it, the particles and organisms that tidal-floods deposit on it, and on the atmospheric temperature. The highest salinity edge of the sabkha, usually receives subterranean (underground) seawater flow and low levels of rainwater. It is made out of sediment that, when one walks on it, feels like quick sinking sand. When water gets evaporated by the hot rays of the sun, white salt crystals are left behind, and only the hardiest microbes and no other organisms are able to survive. The Salt Lake in Utah, USA, has a similar look to our white sabkhat in Qatar and the Gulf. In edges that only receive tiny amounts of rainwater, the sabkha is sandy, yellowish, and dry. The Gulf sand gecko may be the only reptile observed in the edges of sabkhat. Its swollen fingers and elongated spiny scales on the underside are thought to be direct adaptations to life in this ecosystem. As we move towards areas that get tidal floods, the sabkha surface becomes darker and wavy but dry most of the time, and as we get close to the intertidal, the sabkha is lined with leathery-to-the-touch microbial mats.Other InformationPublished in: Qatar Marine Ecosystem lesson plans
License: https://creativecommons.org/licenses/by-nc-nd/4.0/
See educational resource on publisher's website: https://www.earthna.qa/publications/educational-materials/qatar-marine-ecosystem-lesson-plans
Project Identifier (PI): EEF-2023-003
Fine Structure Anomalies and Search for Variation of the Fine Structure Constant in Laboratory Experiments
Creators: name: Dzuba, V. A.
name: Flambaum, V. V.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: Configuration interaction in many-electron atoms may cause anomalies in the fine structure which make the intervals small and very sensitive to variation of the fine structure constant. Repeated precision measurements of these intervals over long period of time can put strong constrain on possible time variation of the fine structure constant. We consider the $5p^4 \ ^3$P$_{2,1,0}$ fine structure multiplet in the ground state of neutral tellurium as an example. Here the effect of change of the fine structure constant is enhanced about one hundred times in the relative change of the small energy interval between the $^3$P$_1$ and $^3$P$_0$ states.
description: 4 pages, 1 fugure, submitted to Phys. Rev. A
Organizational Innovation in Russian Agriculture: The Emergence of "New Agricultural Operators" and Its Consequences
Creators: name: Rylko, Dmitri N.
name: Jolly, Robert W.
name: Mosolkova, Maria A.
name: Rylko, Dmitri N.
name: Jolly, Robert W.
name: Mosolkova, Maria A.
Publisher: name: Unknown
Year: 2005
Subjects: subject: Industrial Organization
subject: agroholdings
subject: contract and custom farming
subject: new agricultural operators
subject: integration

description: After almost a decade of downsizing, Russian agriculture has been steadily growing since the end of 90's against the background of deep organizational changes and innovations. The traditional collective farming segment is the key target and subject of innovations. Outside investors and operators have acquired control over farm assets from the primary nominal owners and possessors. As a result, exceptionally large commercial farm operations - "agroholdings" - are being created. Both inside and outside innovators are introducing organizational changes such as vertical integration, custom and contract farming, land leasing, machinery sharing and others. The paper discusses size, scope and character of the ongoing innovations and their short and long-term consequences.