cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Probing Axion-like Particles via CMB Polarization
Creators: name: Fujita, Tomohiro
name: Minami, Yuto
name: Murai, Kai
name: Nakatsuka, Hiromasa
Publisher: name: arXiv
Year: 2020
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Axion-like particles (ALPs) rotate the linear polarization of photons through the ALP-photon coupling and convert the cosmic microwave background (CMB) $E$-mode to the $B$-mode. We derive the relation between the ALP dynamics and the rotation angle by assuming that the ALP $ϕ$ has a quadratic potential, $V=m^2ϕ^2/2$. We compute the current and future sensitivities of CMB observations to the ALP-photon coupling $g$, which can reach $g=4\times 10^{-21}\,\mathrm{GeV}^{-1}$ for $10^{-32}\,\mathrm{eV}\lesssim m\lesssim 10^{-28}\,\mathrm{eV}$ and extensively exceed the other searches for any mass $m\lesssim 10^{-25}\,\mathrm{eV}$. We find that the fluctuation of the ALP field at the observer, which has been neglected in previous studies, can induce significant isotropic rotation of the CMB polarization. The measurements of isotropic and anisotropic rotation allow us to put bounds on relevant quantities such as the ALP mass $m$ and the ALP density parameter $Ω_ϕ$. In particular, if LiteBIRD detects anisotropic rotation, we obtain the lower bound on the tensor-to-scalar ratio as $r > 5 \times 10^{-9}$.
description: 7 pages, 2 figures
110/2b-9: Dalton Field, East Irish Sea
Creators: name: T. R. KING
name: M. WANNELL
name: T. M. ALQASSAR
Publisher: name: Geological Society of London
Year: 2020
Subjects: subject: Geology
subject: FOS: Earth and related environmental sciences

description: Dalton is a gas field located in Block 110/2b at the north of the East Irish Sea Basin in the UKCS. Dalton was discovered in 1990 by well 110/2b-9 which encountered a dry gas column of 345ft within the Ormskirk Sandstone Formation of the Triassic Sherwood Sandstone. The field was developed in 1999 by wells 110/2b-R1, and 110/2b-R2. Wells were located on the eastern field crest in order to attain maximum gas column, and maximise recovery from the good quality reservoir (average permeability >50 mD). Production tests showed the majority of flow from the wells to come from thin high permeability (>200 mD) aeolian sands. Two smaller highs located in the west and south, separated from the eastern crest by a saddle and normal faults were not drilled, and were assumed to be in communication through the good quality reservoir and open intra-reservoir faults with the field crest in the east. The risk of fault sealing in the high permeability, high net reservoir was considered as low. Initial gas production in 1999 of 100 mmscf/d was followed by a rapid decline to 15 mmscf/d early in 2001. This rapid decline suggests more complex reservoir geology than was anticipated, with barriers to field-wide reservoir communication occurring due to faulting or variation in reservoir quality. Understanding of well underperformance was gained by reservoir remodeling. Geological, production, and simulation data suggest that current wells located on the eastern crest are not accessing gas reserves elsewhere in the field due to sealing of major intra-reservoir faults. Field production has led to the generation of a significant pressure differential c. 600 psi between the eastern fault compartment and the rest of the field. An innovative infill well solution to harness this pressure differential, and induce cross flow across the sealing fault into existing wells via the high permeability aeolian beds is underway. The horizontal well will not be completed or tied back at surface, and hence, if successful will be a neat, low cost solution to increasing Dalton field reserves.
Small dairy farms - perspective of income after 2015
Creators: name: Kołoszycz, Ewa
name: Świtłyk, Michał
name: Kołoszycz, Ewa
name: Świtłyk, Michał
Publisher: name: Unknown
Year: 2015
Subjects: subject: Agricultural and Food Policy
subject: Agricultural Finance
subject: Livestock Production/Industries
subject: small dairy farms
subject: income
subject: production risk
subject: direct support
subject: milk yield
subject: production and economic situation
subject: volatility of milk prices
subject: milk quota
subject: greening

description: The article concerns the problems of profitability of dairy farms, which ac¬cording to classification of the Central Statistical Office, belong to the group of very small and small farms. Analysis of production and economic situation covers the years 2015-2020 and takes into account the changes in the regula¬tions in terms of direct support for farms. Data from 94 farms, characterised by high specialisation in the production of milk, were used for the purpose. The study takes into account the volatility of milk prices and milk yield of cows this, in turn, allowed to achieve distribution of agricultural income in each year of the analysis. The results show that small dairy farms in the coming period can expect an increase in farm income, but their level in half of the farms will not exceed the income parity. The risk of negative agricultural income refers to a small number of farms and the occurrence of this phenomenon is unlikely.
Capital concentration versus financial efficiency of family farms
Creators: name: Bereżnicka, Joanna
name: Bereżnicka, Joanna
Publisher: name: Unknown
Year: 2015
Subjects: subject: Agribusiness
subject: Agricultural Finance
subject: Research Methods/ Statistical Methods
subject: capital concentration
subject: financial efficiency
subject: family farm
subject: equity
subject: weighted average cost of capital
subject: quartile
subject: return
subject: cost of capital

description: The paper presents research findings concerning financial efficiency in the context of capital concentration in the economy. The research was based on farm data collecting information on accounting for 2004-2011. The research shows that returns, obtained by farms more intensively gathering capital, are below the weighted average cost of capital.
Rural development in the context of European integration of Ukraine
Creators: name: Furdychko, Orest
name: Gnativ, Natalia
name: Furdychko, Orest
name: Gnativ, Natalia
Publisher: name: Unknown
Year: 2015
Subjects: subject: Agricultural and Food Policy
subject: Crop Production/Industries
subject: International Development
subject: Livestock Production/Industries
subject: competitiveness of agriculture
subject: food industry enterprises
subject: rural areas
subject: rural population
subject: urban population
subject: Stryi district
subject: sustainable rural development
subject: agricultural production
subject: European experience

description: The paper describes the key aspects of rural development in Ukraine. Attention is focused on the interpretation of a concept of “rural areas” as an object of scientific research on economy of nature management and environment protection. It substantiates the importance of Ukraine’s transition to the sustainable rural development concept. The paper also characterises the advantages and disadvantages of basic components of sustainable rural development: economic, social and ecological. The fundamental problems and factors of present-day unsatisfactory condition of rural development in Ukraine are presented. The usefulness of providing into the following research the normative and legal factors in order to improve state administrative system and management is proved. Prospective directions of Ukrainian government support for sustainable rural development are suggested. European experience of sustainable rural development and possibility of its application in Ukraine is discussed.
Are bank’s speculative profits at the expense of traders? A reply
Creators: name: SCHULMEISTER, S.
Publisher: name: PSL Quarterly Review
Year: 2013
Subjects: subject: Banks, Speculative trade, Foreign exchange markets, Stability
subject: F31, G21

description: The author states that empirical evidence suggests that two types of speculator currently exist in the foreign exchange markets: the first type of speculator simply follows trend movements in exchange rates; the second type anticipates the turning point in trends and thereby turns such runs around. The first type of trade is destabilising and the second type helps to maintain stability. However, both types depend upon an unstable system. Rational operators who attempt to determine fundamental equilibriums appear irrational in terms of the profits they earn. This constitutes a paradox for economic theorists. JEL: F31, G21
description: PSL Quarterly Review, V. 43, N. 174 (1990)
Atomic carbon at redshift ~2.5
Creators: name: Weiss, A.
name: Downes, D.
name: Henkel, C.
name: Walter, F.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Using the IRAM 30m telescope we detected the lower fine structure line of neutral carbon towards three high--redshift sources: IRAS FSC10214 (z=2.3), SMMJ14011+0252 (z=2.5) and H1413+117 (Cloverleaf quasar, z=2.5). SMMJ14011+0252 is the first high--redshift, non--AGN source in which CI has been detected. The CI(1-0) line from FSC10214 is almost an order of magnitude weaker than previously claimed, while our detection in the Cloverleaf is in good agreement with earlier observations. The CI(1-0) linewidths are similar to the CO widths, indicating that both lines trace similar regions of molecular gas on galactic scales. Derived CI masses for all three objects are of order few 10^7 solar masses and the implied CI(1-0)/CO(3-2) line luminosity ratio is about 0.2. This number is similar to values found in local galaxies. We derive a CI abundance of 5x10^{-5} which implies significant metal enrichment of the cold molecular gas at redshifts 2.5 (age of the universe 2.7 Gyr). We conclude that the physical properties of systems at large lookback times are similar to today's starburst/AGN environments.
description: 4 pages, 2 figures; accepted by A&A
Dilemmas in a financial dimension of sustainability of farms
Creators: name: Soliwoda, Michał
name: Soliwoda, Michał
Publisher: name: Unknown
Year: 2015
Subjects: subject: Agricultural Finance
subject: Farm Management
subject: Land Economics/Use
subject: sustainability
subject: sustainable growth
subject: agricultural finance
subject: methodology of finance
subject: farm

description: Sustainability, as a specific inter- or even transdisciplinary “metacat-egory”, refers also to monetary processes. So far, a financial approach of sustainability of farms has not been explored. The aim of this paper was to highlight some theoretical and methodological issues related to a financial dimension of sustainability of farms. The research objectives were as fol-lows: (1) to link achievements in the area with theoretical and methodological apparatus for sustainable growth (in financial terms) of farms to concepts of sustainability, (2) to identify associations between the sustainable growth and selected agricultural farm management problems and agrarian policy. Relying on agricultural income category (including net farm income), excluding the farm’s financial situation, leads to a significant simplification that may deform an analytical framework for sustainability. The terms “sustainable growth”, “sustainable growth rate”, “sustainable intensification” may extend the current framework for analysing the sustainability of farms, as well as be a prerequisite for constructing/improving instruments that may support farm management, or monitoring and evaluation of the effects of agricultural policy.
The radical reflections of an applied economist
Creators: name: PHELPS BROWN, H.
Publisher: name: PSL Quarterly Review
Year: 2013
Subjects: subject: Henry Phelps Brown, biography, recollections
subject: B31, A10

description: The paper is a contribution to a series of recollections and reflections on the professional experiences of distinguished economists which the Banca Nazionale del Lavoro Quarterly Review started in 1979. In it Henry Phelps Brown looks back to reflect on the profession of economics. JEL: B31, A10
description: PSL Quarterly Review, V. 33, N. 132 (1980)
Nonlinear least-squares spline fitting with variable knots
Creators: name: Kovács, Péter
name: Fekete, Andrea M.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Signal Processing (eess.SP)
subject: Numerical Analysis (math.NA)
subject: Optimization and Control (math.OC)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Mathematics
subject: G.1.1; G.1.2; G.1.6; G.1.10
subject: 65K10, 65D10, 65D07, 90C59, 92C55

description: In this paper, we present a nonlinear least-squares fitting algorithm using B-splines with free knots. Since its performance strongly depends on the initial estimation of the free parameters (i.e. the knots), we also propose a fast and efficient knot-prediction algorithm that utilizes numerical properties of first-order B-splines. Using $\ell_p\;(p=1,2,\infty)$ norm solutions, we also provide three different strategies for properly selecting the free knots. Our initial predictions are then iteratively refined by means of a gradient-based variable projection optimization. Our method is general in nature and can be used to estimate the optimal number of knots in cases in which no a-priori information is available. To evaluate the performance of our method, we approximated a one-dimensional discrete time series and conducted an extensive comparative study using both synthetic and real-world data. We chose the problem of electrocardiogram (ECG) signal compression as a real-world case study. Our experiments on the well-known PhysioNet MIT-BIH Arrhythmia database show that the proposed method outperforms other knot-prediction techniques in terms of accuracy while requiring much lower computational complexity.
description: Demonstrations and simulation data are available online at https://numanal.inf.elte.hu/~kovi/docs/pubs/
The influence of geographic scale, climate and trophic dynamics upon North Pacific oceanic ecosystem models
Creators: name: Preikshot, David B.
Publisher: name: University of British Columbia
Year: 2011

description: Dynamic simulation models of three nested North Pacific ecosystems (the Strait of Georgia, the British Columbia Shelf and the Northeast Pacific) were constructed to examine how area scale affects modelled historic changes of trophic interactions, fisheries and climate. Species groups were the same for all ecosystem models, with a focus upon commercially important fish species. The models were dynamic and spanned the period from 1950 to the start of the 21st Century. Time series data for biological indicators were compared to predicted model time series, under different scenarios of ecosystem control: top-down, bottom-up, or combinations thereof. Results of these scenarios suggest that while fisheries, and predation / competition effects explain most population changes for commercially important fish species, all species modelled also appear to experience bottom-up effects driven by climate change, and regime shifts. The ecosystem models suggest such bottom-up dynamics through predicted primary production anomalies similar to decadal cycling seen in climate indices like the Pacific Decadal Oscillation (Northeast Pacific), upwelling at 54°N (BC shelf) and Salinity / Fraser River discharge (Strait of Georgia). The results of this work suggest that both the area and scale over which indices of regime shifts and climate change are measured are linked, via bottom-up forcing, to changes in biomasses of all trophic levels in these ecosystems. The ability to link bottom-up and top-down dynamics provides an exciting way for ecosystem models to contribute to the formulation of policy and cross validation of single species stock assessment research.
Farms combining organic and conventional production methods at the background of organic farms
Creators: name: Nachtman, Grażyna
name: Nachtman, Grażyna
Publisher: name: Unknown
Year: 2015
Subjects: subject: Agricultural and Food Policy
subject: Environmental Economics and Policy
subject: Livestock Production/Industries
subject: organic farming
subject: organic and conventional production system
subject: agricultural accountancy
subject: organic production efficiency
subject: profitability of organic farms

description: Organic farming in Poland covers farms using only organic farming methods and farms where organic and conventional systems coexist. Statistics capture them jointly as organic farms. This distorts the real picture of the Polish organic farming, especially the average area of farms, and production and economic situation, which is evidenced by data from organic farms keeping accounting under the Polish FADN. There were considerable differences between the analysed organic and “mixed” farms as regards the cropping structure and livestock population, level of incurred costs and production efficiency, thereby their profitability. Results of the analyses proved that mixed farms were fairly competitive in economic terms against farms using strictly organic production methods, and their income was far less dependent on external support, although the level of subsidies to operating activities per 1 ha of utilised agricultural area was close to the level noted for organic farms.
Chiral topologically ordered insulating phases in arrays of interacting integer quantum Hall islands
Creators: name: Ebisu, Hiromi
name: Kalloor, Rohit R.
name: Tsvelik, Alexei M.
name: Oreg, Yuval
Publisher: name: arXiv
Year: 2020
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We study networks of Coulomb-blockaded integer quantum Hall islands with even fillings $ν=2k$ ($k$ being an integer), including cases with $2k$ layers each of $ν=1$ fillings. Allowing only spin-current interactions between the islands (i.e., without any charge transfer), we obtain solvable models leading to a rich set of insulating $SU(2)_k$ topologically ordered phases. The case with $k=1$ is dual to the Kalmeyer-Laughlin phase, $k=2$ to Kitaev's chiral spin liquid and the Moore-Read state, and $k=3$ contains a Fibonacci anyon that may be utilized for universal topological quantum computation. Additionally, we show how the $SU(2)_k$ topological phases may be obtained also in an array of islands with $ν=2k$ integer quantum Hall states and critical spin chains in a checkerboard pattern. The array and checkerboard constructions gap out the charge mode and additional "flavor" modes by virtue of their geometry. Furthermore, we find that a fine tuning of the system parameter is not needed in the checkerboard configuration and the $ν=2$ case. We also discuss their bulk excitations, and show that their thermal Hall conductance is universal, reflecting the central charge $c=3k/(k+2)$ of the chiral edge modes.
description: 15 pages, 4 figures
Evolutions of thought in economics
Creators: name: SHACKLE, G.L.S.
Publisher: name: PSL Quarterly Review
Year: 2013
Subjects: subject: History of economic thought, Classical, Keynesian, Sraffian
subject: B15, B20

description: The article briefly summarises the history of economic thought from Quesnay to the 1920s-30s focusing on the pre-analytical vision and essential questions answered by economists at different times. It specifically draws the main ideas and themes that connect the classical tradition, based on the distribution of the surplus, with the Keynesian and Sraffian tradition. JEL: B15, B20
description: PSL Quarterly Review, V. 33, N. 132 (1980)
Dynamic behavior of the antiferromagnetically coupled bilayer Ising model
Creators: name: Ekiz, C.
name: Erdem, R.
name: Semet, D.
Publisher: name: arXiv
Year: 2024
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Using the path probability and lowest approximation of cluster variation method, we study the dynamic and equilibrium properties of a bilayer magnetic system, consisting of two ferromagnetic monolayers antiferromagnetically coupled for different spins $(σ=1/2$ and $S=1)$. Firstly, numerical results of the monolayer and total magnetizations are presented under the effect of the diverse physical parameters, and the phase diagrams of bilayer system are discussed. Then, since it is well established that the path probability method is an effective method for the existence of metastable states, the time evolution of monolayer- and total magnetizations is investigated.
description: 11 pages, 6 figures
Impact of business corporations on the Polish food market
Creators: name: Chechelski, Piotr
name: Chechelski, Piotr
Publisher: name: Unknown
Year: 2015
Subjects: subject: Agricultural and Food Policy
subject: International Development
subject: International Relations/Trade
subject: food market
subject: transnational business corporations
subject: development

description: The paper aimed at analysis of changes taking place in the food market in Poland under the influence of transnational business corporations. Their physical and financial assets, and knowledge enable them to exert an increasing influence on other market participants, and to develop rapidly. However, due to the large number of transnational corporations (lower concentration) their impact on the Polish food market in the first decade of the twenty-first century proceeded somewhat differently than in other developed countries in Europe.
Presentation: The Differences of Fartlek and Plyometric Exercises on Increasing Body Immunity through VO2 Max with Multistage Fitness Test for Women Volleyball Players
Creators: name: R Agung Purwandono Saleh
name: Saptono, Tri
name: Sumintarsih
Publisher: name: Zenodo
Year: 2022

description: This material has presented on 1st International Conference on Advanced Research in Engineering and Technology. October 25, 2022
The future of the international monetary system
Creators: name: TRIFFIN, R.
Publisher: name: PSL Quarterly Review
Year: 2013
Subjects: subject: International monetary system, floating exchange rates, control, liquidity, commercial banking
subject: E42

description: The work argues that neither stable, nor floating exchange rates can function satisfactorily in the absence of any international control, and restraints, over the fantastic explosion of international liquidity provided to the market, in recent years, by the monetary authorities and the commercial banking system. The author focuses on the inflationary aspects of this phenomenon, neglecting the problems of recession and unemployment. JEL: E42
description: PSL Quarterly Review, V. 33, N. 132 (1980)
Solar Neutrino Oscillation - An Overview
Creators: name: Roy, D. P.
Publisher: name: arXiv
Year: 2004
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: After a brief summary of the neutrino oscillation formalism and the solar neutrino sources and experiments I discuss the matter effect on solar neutrino oscillation. Then I discuss how the resulting alternative solutions are experimentally resolved in favour of the LMA solution, with particular exphasis on the SK, SNO and KL data.
description: 13 pages Latex plus 10 eps figures, Plenary Talk at the Xth International Symposium on Particles, Strings and Cosmology (PASCOS), Boston, 16-22 August 2004; one figure and a few numbers updated
On the use of the group SO(4,2) in atomic and molecular physics
Creators: name: Kibler, Maurice Robert
Publisher: name: arXiv
Year: 2004
Subjects: subject: Quantum Physics (quant-ph)
subject: Mathematical Physics (math-ph)
subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: In this paper the dynamical noninvariance group SO(4,2) for a hydrogen-like atom is derived through two different approaches. The first one is by an established traditional ascent process starting from the symmetry group SO(3). This approach is presented in a mathematically oriented original way with a special emphasis on maximally superintegrable systems, N-dimensional extension and little groups. The second approach is by a new symmetry descent process starting from the noninvariance dynamical group Sp(8,R) for a four-dimensional harmonic oscillator. It is based on the little known concept of a Lie algebra under constraints and corresponds in some sense to a symmetry breaking mechanism. This paper ends with a brief discussion of the interest of SO(4,2) for a new group-theoretical approach to the periodic table of chemical elements. In this connection, a general ongoing programme based on the use of a complete set of commuting operators is briefly described. It is believed that the present paper could be useful not only to the atomic and molecular community but also to people working in theoretical and mathematical physics.
description: 31 pages
title: Effects of Simultaneous Alarms on Resolution Heuristics
Creators: name: Allen, Amanda C.
Publisher: name: Old Dominion University
publisherIdentifier: https://ror.org/04zjtrb98
publisherIdentifierScheme: ROR
Year: 2024

description: Automated signaling systems are frequently used to direct operator attention to potential hazards. Although these automated systems can lead to enhanced human performance, factors such as degraded alarm signal reliability and lack of trust can undermine the potential benefits of automation (Breznitz, 1984; Rice, 2009, Wickens & 2007). Additionally, work by Gilson, Mouloua, Graft, and McDonald (2001), as well as Keller and Rice (2009), suggest that an alarm contained within a larger array of alarms should not be evaluated individually. Due to the increasing use of multiple alarms in complex environments such as operating rooms and cockpits (Konkani, Oakley, & Bauld, 2012; Woods, Sarter, & Billings, 1997), it is important to identify reaction strategies that may and should be used when an unreliable alarm is in the presence of other alarms. Accordingly, the influence of reliability level and the number of additional activated alarms on objective trust, reaction time, and acceptance rate with a 12-alarm array was evaluated using a 2 x 12 split-plot factorial design. Overall a significant linear trend was observed in objective trust measures as the number of additional activated alarms (p & .001). This finding indicates the number of additional activated alarms, instead of the given alarm reliability, was used to calibrate objective trust. Reaction time was found to be quadratic (p & .001). Acceptance rate followed a cubic trend (p & .001), with significant quadratic (p = .02) and significant linear (p & .001) derivative trends. This suggests participant response changed from alarm dismissal to acceptance near 50% of alarm array activation. Finally, there was a significant effect of reliability level (p & .001) on acceptance rate, although no significance differences were found between the 50% and 75% groups. Overall, the results constitute evidence for an extension of probability matching theory based on percent system activation and indicate the need to minimize alarms in display design.
Exploring the structural, electronic, magnetic, and magneto-optical properties of double perovskites $\text{Ca}_2\text{TMIrO}_6$ (TM=Fe, Co) through first principles study
Creators: name: Touaibia, I.
name: Bouguerra, A.
name: Guenez, W.
name: Chemam, F.
Publisher: name: arXiv
Year: 2024
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: This study is aimed at exploring the electronic, magnetic, and magneto-optical properties of double perovskites Ca$_2$FeIrO$_6$ and Ca$_2$CoIrO$_6$ {with monoclinic structure (space group P21/$c$) } in order to examine their potential applications in spintronic and photovoltaic devices. The calculations were done using the full-potential linearized augmented plane wave within the density functional theory. For the electronic exchange-correlation function, we used the generalized gradient approximation (GGA) and GGA+U (Hubbard potential), and spin-orbit coupling (SOC). The study showed that Ca$_2$FeIrO$_6$ and Ca$_2$CoIrO$_6$ exhibit a monoclinic structure (space group P21/$c$). The structure relaxation shows an antiferromagnetic behavior in both systems with a magnetic moment of about 6.00$μ_B$ for Ca$_2$FeIrO$_6$ and 4.00$μ_B$ for Ca$_2$CoIrO$_6$ by using GGA+U approximation. The results of GGA and GGA+U predict the half-metallic behavior of Ca$_2$FeIrO$_6$ and Ca$_2$CoIrO$_6$. The magneto-optical polar Kerr effect (MOKE) was examined by studying the variation of Kerr and ellipticity rotation. The Kerr rotation angle is $1.3^{\circ}$ at 4.82 eV and $-1.21^{\circ}$ at 4.3 eV, and the ellipticity angle is $-1.21^{\circ}$ at 4.3 eV for Ca$_2$FeIrO$_6$. In the case of Ca$_2$CoIrO$_6$, the Kerr rotation angle is $-1.04^{\circ}$ at 4.05 eV; the significant Kerr rotation in both compounds may suggest the application of these materials in optoelectronics bias. The named compounds have a potential application in the field of spintronics and its devices, such as in optoelectronics technologies.
description: 9 pages, 6 figures, 2 tables
Chandra Observations of low velocity dispersion groups
Creators: name: Helsdon, Stephen F.
name: Ponman, Trevor J.
name: Mulchaey, J. S.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Deviations of galaxy groups from cluster scaling relations can be understood in terms of an excess of entropy in groups. The main effect of this excess is to reduce the density and thus luminosity of the intragroup gas. Given this, groups should also should show a steep relationship between X-ray luminosity and velocity dispersion. However, previous work suggests that this is not the case with many measuring slopes flatter than the cluster relation. Examining the group L_X:σrelation shows that much of the flattening is caused by a small subset of groups which show very high X-ray luminosities for their velocity dispersions (or vice versa). Detailed Chandra study of two such groups shows that earlier ROSAT results were subject to significant (~30-40%) point source contamination, but confirm that a significant hot IGM is present in these groups, although these are two of the coolest systems in which intergalactic X-ray emission has been detected. Their X-ray properties are shown to be broadly consistent with those of other galaxy groups, although the gas entropy in NGC 1587 is unusually low, and its X-ray luminosity correspondingly high for its temperature, compared to most groups. This leads us to suggest that the velocity dispersion in these systems has been reduced in some way, and we consider how this might have come about.
description: Accepted for publication in ApJ
The need to control international bank lending
Creators: name: KESSLER, G.A.
Publisher: name: PSL Quarterly Review
Year: 2013
Subjects: subject: International bank lending, policy, monetary management, deficits, cooperation
subject: F34

description: The work deals with the process of international bank lending and with the policy implications for monetary management. The author argues that foreign bank credit expansion has (or is likely to) become an important monetary factor. The macro and micro aspects of the dynamics of the process of this expansion and the relation to the US balance of payments deficit are analysed. Some general remarks are made with respect to the need for intensified international monetary cooperation. JEL: F34
description: PSL Quarterly Review, V. 33, N. 132 (1980)
Complexity, cost and quality of ecosystem models and their impact on resilience : a comparative analysis, with emphasis on marine mammals and the Gulf of St. Lawrence
Creators: name: Morissette, Lyne
Publisher: name: University of British Columbia
Year: 2011

description: The development of an ecosystem approach is essential to improve understanding of the nature and dynamics of exploited marine ecosystems and the complexity of species interactions. A database of 393 Ecopath models was compiled to investigate questions pertaining to (1) the uncertainty in model parameters, (2) the relationship between ecosystem complexity and stability, (3) the effect of marine mammals on ecosystem productivity, and (4) the lack of recovery of commercially caught predatory fish species. Reviewing the strengths and weaknesses of Ecopath methods showed that few published models have addressed uncertainty even when the tools were provided with the software. Estimating uncertainty (with confidence intervals for parameters) was improved by combining the Ecopath approach with other modelling techniques. The second analyses, using 50 ecosystem models, showed that quality of input data affects conclusions concerning the relationship between complexity and stability in ecosystems. Findings further support the notion that stability also increases as community complexity (expressed as ascendancy and omnivory) increases. The third analyses used seven ecosystem models to explore whether the presence of marine mammals and their overlap with fisheries for food resources affects overall ecosystem productivity, and whether their extirpation could decrease productivity. Simulation results were equivocal about whether extirpation of marine mammals from ecosystems would benefit fisheries, while mixed trophic impact analyses suggested that beneficial predation does occur in these ecosystems. Finally, a case-study of four Ecopath models from the Gulf of St. Lawrence addressed the collapse in biomass of predatory fish and the potential causes of the lack of recovery of these species. Analyses revealed that the ecosystem structure shifted from one previously dominated by piscivorous groundfish during the mid-1980s to one dominated by small-bodied pelagic species during the mid-1990s. Part of the total mortality of groundfish was accounted for by seal predation when fishing mortality was reduced. These analyses collectively demonstrate the value of investigating ecological questions applicable to marine ecosystems using a multi-model comparative approach.
Rentabilidade da Produção de Acerola Orgânica Sob Condição Determinística e de Risco: estudo do distrito de irrigação Tabuleiro Litorâneo do Piauí
Creators: name: Martins, Élica De Aguiar
name: Campos, Robério Telmo
name: Campos, Kilmer Coelho
name: Almeida, Cleycianne De Souza
name: Martins, Élica De Aguiar
name: Campos, Robério Telmo
name: Campos, Kilmer Coelho
name: Almeida, Cleycianne De Souza
Publisher: name: Unknown
Year: 2016
Subjects: subject: Agribusiness
subject: Economic outcome measures
subject: Monte Carlo simulation
subject: Coastal Irrigation District Board
subject: Piauí.

description: In the Northeastern region of Brazil, production alternatives that are economically feasible are scarce and the organic acerola production can be set among those which increases income and keep the families in the rural areas. Therefore, this study aims to assess the feasibility of the organic acerola production under deterministic and risk conditions in the Irrigation District of Tabuleiro Litorâneo of Piauí State, Brazil. To this end, we used primary data gathered from a sample of 23 producers in 2011. As methods of analysis, we applied measurements of economic outcomes for the deterministic assessments and the Monte Carlo simulation method for risk analysis. The deterministic evaluation showed that ten producers from the sample were economically infeasible while the other had acceptable profitability. For risk analysis, we obtained similar results, noting that producers who had developed the activity without following technical recommendations were impractical and faced higher risk, whereas those who are more technified have higher profitability and lower risk. We suggest carrying out public policies such as the provision of training programs in organic acerola production and agricultural management and marketing, in addition to individualized technical assistance to support producers in the right use of inputs.
Managing Reservoir Uncertainty after 5 years of field life - Britannia Field
Creators: name: W. R. SUMNER
name: S. LOUTIT
name: E. TOHILL
name: D. WAY
name: D. CRIDDLE
name: A. PALFREY
name: W. G. HAKES
name: S. ARCHER
name: J. COLLERAN
name: A. SCOTT
name: K. KAISER
name: A. HARDING
name: A. CASTELLINI
name: J. CLARK
name: QI LIANSHUANG
Publisher: name: Geological Society of London
Year: 2020
Subjects: subject: Geology
subject: FOS: Earth and related environmental sciences

description: The Britannia reservoir consists of deep-water sandstones of mass flow origin, ranging from high density 'clean' turbidites to non-reservoir facies consisting of debris and slurry flows. Britannia reservoir models rely on over 20,000 ft of core to define the reservoir zonation and facies scheme within the static reservoir model. Recent core-based reservoir studies, including a refinement of the depositional models for upper reservoir Zones 50, 45, and 40, fault seal property evaluation, and detailed diagenetic studies, have further benefited the earth model. A rigorous re-correlation study based on biostratigraphy and geochemical chemostratigraphy have led to refined flow unit definition. The main rock types in the Britannia field are S3 Clean, Banded, and Mixed Slurry Sandstones. Each of these has its own particular petrophysical characteristics that decrease in reservoir quality as listed above. Therefore it is essential to understand each rock type's depositional and sedimentary architecture. In addition, remobilisation of sediments means that the initial depositional orientation may not necessarily reflect resultant slump orientation. Cores from the Zone 40 sandstone are displayed together with well crosssections to demonstrate variations in gross lithological distributions, both geographically and stratigraphically.
Change in the Nuclear Moment of Inertia at the Number of Neutrons N = 98 and Isotopic Shift of Atomic Levels
Creators: name: Kamchatnov, A. M.
name: Nosov, V. G.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: From analysis of experimental data on nuclear rotation, it is found that the so-called rigid-body value of the nuclear moment of inertia and the nuclear-radius values associated with the moment of inertia as functions of the number of nucleons change their behavior at the number of neutrons $N = 98$. This phenomenon is confirmed by experimental data on the isotopic shifts of atomic levels.
description: 4 pages, 2 figures
Floating exchange rates, reciprocity and trade balance
Creators: name: AHMAD, J.
Publisher: name: PSL Quarterly Review
Year: 2013
Subjects: subject: Reciprocity, trade liberalisation, fixed exchange rates, floating exchange rates
subject: E42

description: The basis for reciprocal concessions in the process of multilateral trade liberalisation is firmly established for fixed exchange rate regimes. The move from fixed to flexible exchange rates suggests that commercial policy negotiations and indeed trade liberalisation itself can be divorced from balance of payments considerations. However, the full range of implications of floating rates for international trade and capital movements is still not fully understood. The paper discusses a number of significant issues that are likely to entangle the relationship between reciprocity in trade liberalisation and its consequences for trade balance in a regime of floating exchange. JEL: E42
description: PSL Quarterly Review, V. 33, N. 132 (1980)
Excitonic polarons and self-trapped excitons from first-principles exciton-phonon couplings
Creators: name: Dai, Zhenbang
name: Lian, Chao
name: Lafuente-Bartolome, Jon
name: Giustino, Feliciano
Publisher: name: arXiv
Year: 2024
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: Excitons consist of electrons and holes held together by their attractive Coulomb interaction. Although excitons are neutral excitations, spatial fluctuations in their charge density couple with the ions of the crystal lattice. This coupling can lower the exciton energy and lead to the formation of a localized excitonic polaron, or even a self-trapped exciton in the presence of strong exciton-phonon interactions. Here, we develop a theoretical and computational approach to compute excitonic polarons and self-trapped excitons from first principles. Our methodology combines the many-body Bethe-Salpeter approach with density-functional perturbation theory, and does not require explicit supercell calculations. As a proof of concept, we demonstrate our method for a compound of the halide perovskite family.
Saúde Respiratória e Mecanização da Colheita da Cana-de-Açúcar nos Municípios Paulistas: a importância do Protocolo Agroambiental
Creators: name: Saiani, Carlos Cesar Santejo
name: Perosa, Bruno Benzaquen
name: Saiani, Carlos Cesar Santejo
name: Perosa, Bruno Benzaquen
Publisher: name: Unknown
Year: 2016
Subjects: subject: Agribusiness
subject: Burning
subject: Sugarcane
subject: Respiratory disease
subject: Protocolo Agroambiental
subject: Panel data.

description: The signature of Protocolo Agroambiental in 2007 deeply affected the adoption of mechanical harvesting of sugarcane in São Paulo State, Brazil. Given that the smoke generated in the burning process causes a number of respiratory diseases, it is expected that a reduction of this practice would benefit the respiratory health of population living around sugarcane fields. The main goal of this paper was to estimate if the increase in mechanical harvesting is effectively improving the respiratory health of this population. In order to reach this objective, we made estimations using data of the area using mechanized harvesting in São Paulo State municipalities from 2006 to 2011, as well as data about the hospitalization related to respiratory problems in this period. Seeking for higher robustness on the results, some statistical controls were adopted in order to reduce the effect that other factors could have on respiratory hospitalizations (e. g. meteorological, geographical and socioeconomic variables). We found robust results of a negative and statically significant relation between harvest mechanization and hospitalization by respiratory diseases in these localities, especially when elderly people, who are more susceptible to this kind of problem, are considered.
Modelling Fine-scale Sedimentological Heterogeneity for Optimal Production from the Neptune Field, Aeolian Gas Reservoir UKCS
Creators: name: R. GARDEN
name: M. MENTIPLY
name: R. COOK
name: I. SYLVESTER
Publisher: name: Geological Society of London
Year: 2020
Subjects: subject: Geology
subject: FOS: Earth and related environmental sciences

description: The Neptune Field lies on the NW margin of the Southern North Sea gas basin in block 47/4b and extends into blocks 47/5a and 42/29. Following development drilling of the field, a rebuild of the deterministic reservoir simulation model failed to provide a reasonable history match except for Flowing Bottom Hole Pressures (FBHP). The poor dynamic history match was due to the modelling not incorporating the permeability heterogeneity seen in the aeolian sandstones of the Neptune Field. A stochastic reservoir model was produce that captured the broad range of scales of critical facies and petrophysical heterogeneities present within this aeolian reservoir. The challenge for the stochastic reservoir model was to capture the key heterogeneities in this high net to gross system. Facies modelling was undertaken using the General Mark Point Processing in Roxar's RMS. Dunes were modelled as prolate ellipsoids with long axes alignment constrained by dip-meter interpretation. Dune dimensions were estimated from outcrop analogues and were conditioned to well data. Aeolian sandsheet and damp interdune facies were modelled as sheet-like oblate ellipsoids inclined at similar dips to the aeolian dunes. Permeability variations due to lamina grain size segregation in aeolian dune foresets were modelled using sector models to capture cross lamina permeability (kx, kz) and lamina parallel flow (ky). The results of sector modelling were incorporated into the stochastic petrophysical realisations where spatial variation in permeability within dunes was modelled using object specific linear piecewise trend porosity and permeability transformations. Dunes were simulated with low permeability dune bases, high permeability lower dune slipfaces and moderate to low permeability upper dune slipfaces. Other minor aeolian and fluvial facies were assumed to be petrophysically isotropic. The stochastic permeability map gave a better BHP response and history match at the development wells than any deterministic permeability distribution modelled.
The role of intrinsic atomic defects in a Janus MoSSe/XN (X = Al, Ga) heterostructure: a first principles study
Creators: name: Yelgel, Ö. C.
Publisher: name: arXiv
Year: 2024
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The interactions between different layers in van der Waals heterostructures have a significant impact on the electronic and optical characteristics. By utilizing the intrinsic dipole moment of Janus transition metal dichalcogenides (TMDs), it is possible to tune these interlayer interactions. We systematically investigate structural and electronic properties of Janus MoSSe monolayer/graphene-like Aluminum Nitrides (MoSSe/g-AlN) heterostructures with point defects by employing density functional theory calculations with the inclusion of the nonlocal van der Waals correction. The findings indicate that the examined heterostructures are energetically and thermodynamically stable, and their electronic structures can be readily modified by creating a heterostructure with the defects in g-AlN monolayer. This heterostructure exhibits an indirect semiconductor with the band gap of 1.627 eV which is in the visible infrared region. It can be of interest for photovoltaic applications. When a single N atom or Al atom is removed from a monolayer of g-AlN in the heterostructure, creating vacancy defects, the material exhibits similar electronic band structures with localized states within the band gap which can be used for deliberately tailoring the electronic properties of the MoSSe/g-AlN heterostructure. These tunable results can offer exciting opportunities for designing nanoelectronics devices based on MoSSe/g-AlN heterojunctions.
description: 10 pages, 5 figures, 1 table