cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Ordering-Flexible Multi-Robot Coordination for MovingTarget Convoying Using Long-TermTask Execution
Creators: name: Hu, Bin-Bin
name: Zhou, Yanxin
name: Wei, Henglai
name: Wang, Yan
name: Lv, Chen
Publisher: name: arXiv
Year: 2024
Subjects: subject: Robotics (cs.RO)
subject: FOS: Computer and information sciences

description: In this paper, we propose a cooperative long-term task execution (LTTE) algorithm for protecting a moving target into the interior of an ordering-flexible convex hull by a team of robots resiliently in the changing environments. Particularly, by designing target-approaching and sensing-neighbor collision-free subtasks, and incorporating these subtasks into the constraints rather than the traditional cost function in an online constraint-based optimization framework, the proposed LTTE can systematically guarantee long-term target convoying under changing environments in the n-dimensional Euclidean space. Then, the introduction of slack variables allow for the constraint violation of different subtasks; i.e., the attraction from target-approaching constraints and the repulsion from time-varying collision-avoidance constraints, which results in the desired formation with arbitrary spatial ordering sequences. Rigorous analysis is provided to guarantee asymptotical convergence with challenging nonlinear couplings induced by time-varying collision-free constraints. Finally, 2D experiments using three autonomous mobile robots (AMRs) are conducted to validate the effectiveness of the proposed algorithm, and 3D simulations tackling changing environmental elements, such as different initial positions, some robots suddenly breakdown and static obstacles are presented to demonstrate the multi-dimensional adaptability, robustness and the ability of obstacle avoidance of the proposed method.
Impact of Social Networks on Buying Behavior: Predicting the Success of Pittsburgh Businesses Through Analysis of Yelp Social Networks
Creators: name: Apoorva Havanur
Publisher: name: Carnegie Mellon University
Year: 2020
Subjects: subject: 140302 Econometric and Statistical Methods
subject: FOS: Economics and business
subject: 140299 Applied Economics not elsewhere classified

description: In this paper, we analyze data collected from Yelp to understand the importance of the social networks created between Yelp reviewers, and the impact it has on the businesses they patronize. We then look at the shape of the social network generated by reviews and identify differences between the behavior of “elite” users vs. non-elite users. We then view the trends in network formation for particular businesses over time, and use features of the network of the business early in its development in order to predict its future success. We construct linear regression and random forest models that solely use features derived from review data, as well as models that are built using a combination of review and social network features. We see that the additional network features are statistically signifant, and help reduce the root mean squared error of our models by a significant percentage. Ultimately, using our network features of reviewers from the first three months of business, we can predict the number of reviewers for a business within its first year with an error of less than 2.5 reviews, an error of 8.5 over two year, and 13 over three.
title: A study on lean implementation at a humanitarian organization
Creators: name: Ebner, Maximilian
Publisher: name: TU Wien
Year: 2017
Subjects: subject: humanitarian organization
subject: lean management

description: This study assesses the applicability of lean for humanitarian aid organizations and what of the lean methodology is useful for humanitarian organizations. A 15 billion USD shortfall in meeting all humanitarian needs motivates humanitarian aid non-governmental organizations (NGO) to improve their efficiency and performance. Lean can reduce the impact of this financial gap and enable humanitarian NGOs to relieve more suffering. An assessment based on existing literature and a lean expert`s experience investigates how the differences in context between business and humanitarian NGOs affect the applicability of lean for humanitarian work. It shows that humanitarian aid organizations face more challenging obstacles than business organizations to become lean due to the contextual work differences. Nevertheless, this work asserts that there is an urgent need for lean in the humanitarian aid sector because it provides tools and an organizational culture that can achieve more with the limited funds they receive. The assessment of the applicability of lean tools to humanitarian operations shows that most lean tools are applicable for humanitarian operations. The lean organizational culture can benefit humanitarian organizations because lean thinking is an organizational mindset of continuous improvement which is not specific to any work context. This thesis also reviews the first organization-wide lean implementation at Medair, an international humanitarian NGO. This case study shows how lean can be adopted to the context and how this lean transformation is being rolled out in a humanitarian NGO.
SAMARASMURPHYdocx.docx
Creators: name: Murphy, Susan
Publisher: name: figshare
Year: 2020
Subjects: subject: 190102 Art History
subject: FOS: Arts (arts, history of arts, performing arts, music)
subject: 210199 Archaeology not elsewhere classified
subject: FOS: History and archaeology
subject: 220403 Islamic Studies
subject: FOS: Philosophy, ethics and religion

description: In 1943, a commission was formed to help protect cultural property and historical monuments from war damage and theft. This commission is called the “Monuments, Fine Arts and Archives Program” and those who worked for it were familiarly known as the Monuments Men. Following this, in 1954, was the establishment of the “Hague (ICRC) Convention for the Protection of Cultural Property in the Event of Armed Conflict” (re-ratified in 1999). Since many of the monuments and sites, we considered this semester are in areas of conflict (in fact some have already been devastated by war, willful destruction, or looting), this was a major concern for our class. For this option, I presented the need for the protection of a cultural site, Samara Archeological Site. This report includes an analysis of the site; a statement on its importance as cultural property; and a potential plan of action to safeguard it in accordance to the ICRC Convention on the Protection of Cultural Property in the Event of Armed Conflict and its Protocols (1954, 1999), with consideration of past cases as justification for my choice.
A submillimetre census of star-formation at high-redshift
Creators: name: Coppin, Kristen Erin Kathryn
Publisher: name: University of British Columbia
Year: 2010

description: Maps, source catalogue and number counts are presented for the largest, most complete and uniform extragalactic submillimetre survey ever undertaken: the 850 μm SCUBA HAlf Degree Extragalactic Survey (SHADES). Using the Submillimetre Common-User Bolometer Array (SCUBA) on the James Clerk Maxwell Telescope (JCMT), SHADES mapped two separate regions of sky: the Subaru/ XMM-Newton Deep Field (SXDF) and the Lockman Hole East (LH). These SCUBA maps cover 720 arcmin² with an RMS noise level of about 2 mJy and have uncovered > 100 submillimetre galaxies. Individual source lists from four groups drawn within the SHADES team (of which this thesis provides a detailed account of one of the reductions) are compared in terms of source flux densities and positions and combined to produce a 120-object SHADES catalogue. This catalogue is an invaluable resource for follow-up campaigns aiming to study the properties of a complete and consistent sample of submillimetre galaxies. For the first time, deboosted flux densities are presented for each submillimetre galaxy using a recipe developed here. SHADES has a high enough number of detected sources that meaningful differential counts can be estimated, unlike most submillimetre surveys which have to consider integral counts. Differential and integral source number counts are given and the differential counts are found to be better fit with a broken power-law or a Schechter function than with a single power-law; the SHADES data alone significantly show that a break is required at several mJy, although the precise position of the break is not well constrained. Based on the SHADES results, an 850 μm survey complete down to 2 mJy would resolve 20-30 per cent of the Far-IR background into point sources. In order to help constrain spectral energy distributions (SEDs) and hence redshifts for the SHADES galaxies, a follow-up effort was undertaken using the Submillimetre High Angular Resolution Camera (SHARC-II; Dowell 2003) at the Caltech Submillimetre Observatory (CSO). The maps and 350 μm flux estimates of a subset of the SHADES catalogue are presented. Using available redshift estimates, I attempt to characterise the SEDs in terms of the dust temperature and far-IR luminosity. Star-formation rates and dust mass estimates for the sample are derived and the SMG population is confirmed to be dominated by very massive ([Asymptotically = to] 5 x 10 ¹⁰ M₀), luminous ([Asymptotically = to] 10 ¹² L₀) star-forming (SFR [Asymptotically = to] 1000 M₀ yr⁻¹) galaxies with intrinsic dust temperatures of [Asymptotically = to] 35 K.
Verification of intensity modulated radiation therapy beams using a tissue equivalent plastic scintillator dosimetry system
Creators: name: Petric, Martin Peter
Publisher: name: University of British Columbia
Year: 2010

description: This thesis describes the development and implementation of a novel method for the dosimetric verification of intensity modulated radiation therapy (IMRT) fields with several advantages over current techniques. Through the use of a tissue equivalent plastic scintillator sheet viewed by a charge-coupled device (CCD) camera, this method provides a truly tissue equivalent dosimetry system capable of efficiently and accurately performing field-by-field verification of IMRT plans. This work was motivated by an initial study comparing two IMRT treatment planning systems. The clinical functionality of BrainLAB’s BrainSCAN and Varian’s Helios IMRT treatment planning systems were compared in terms of implementation and commissioning, dose optimization, and plan assessment. Implementation and commissioning revealed differences in the beam data required to characterize the beam prior to use with the BrainSCAN system requiring higher resolution data compared to Helios. This difference was found to impact on the ability of the systems to accurately calculate dose for highly modulated fields, with BrainSCAN being more successful than Helios. The dose optimization and plan assessment comparisons revealed that while both systems use considerably different optimization algorithms and user-control interfaces, they are both capable of producing substantially equivalent dose plans. The extensive use of dosimetric verification techniques in the IMRT treatment planning comparison study motivated the development and implementation of a novel IMRT dosimetric verification system. The system consists of a water-filled phantom with a tissue equivalent plastic scintillator sheet built into the top surface. Scintillation light is reflected by a plastic mirror within the phantom towards a viewing window where it is captured using a CCD camera. Optical photon spread is removed using a micro-louvre optical collimator and by deconvolving a glare kernel from the raw images. Characterization of this new dosimetric verification system indicates excellent dose response and spatial linearity, high spatial resolution, and good signal uniformity and reproducibility. Dosimetric results from square fields, dynamic wedged fields, and a 7-field head and neck IMRT treatment plan indicate good agreement with film dosimetry distributions. Efficiency analysis of the system reveals a 50% reduction in time requirements for field-by-field verification of a 7-field IMRT treatment plan compared to film dosimetry.
A bright millisecond-duration radio burst from a Galactic magnetar
Creators: name: FRB Collaboration
name: Andersen, B. C.
name: Bandura, K. M.
name: Bhardwaj, M.
name: Bij, A.
name: Boyce, M. M.
name: Boyle, P. J.
name: Brar, C.
name: Cassanelli, T.
name: Chawla, P.
name: Chen, T.
name: Cliche, J. -F.
name: Cook, A.
name: Cubranic, D.
name: Curtin, A. P.
name: Denman, N. T.
name: Dobbs, M.
name: Dong, F. Q.
name: Fandino, M.
name: Fonseca, E.
name: Gaensler, B. M.
name: Giri, U.
name: Good, D. C.
name: Halpern, M.
name: Hill, A. S.
name: Hinshaw, G. F.
name: Höfer, C.
name: Josephy, A.
name: Kania, J. W.
name: Kaspi, V. M.
name: Landecker, T. L.
name: Leung, C.
name: Li, D. Z.
name: Lin, H. -H.
name: Masui, K. W.
name: Mckinven, R.
name: Mena-Parra, J.
name: Merryfield, M.
name: Meyers, B. W.
name: Michilli, D.
name: Milutinovic, N.
name: Mirhosseini, A.
name: Münchmeyer, M.
name: Naidu, A.
name: Newburgh, L. B.
name: Ng, C.
name: Patel, C.
name: Pen, U. -L.
name: Pinsonneault-Marotte, T.
name: Pleunis, Z.
name: Quine, B. M.
name: Rafiei-Ravandi, M.
name: Rahman, M.
name: Ransom, S. M.
name: Renard, A.
name: Sanghavi, P.
name: Scholz, P.
name: Shaw, J. R.
name: Shin, K.
name: Siegel, S. R.
name: Singh, S.
name: Smegal, R. J.
name: Smith, K. M.
name: Stairs, I. H.
name: Tan, C. M.
name: Tendulkar, S. P.
name: Tretyakov, I.
name: Vanderlinde, K.
name: Wang, H.
name: Wulf, D.
name: Zwaniga, A. V.
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Magnetars are highly magnetized young neutron stars that occasionally produce enormous bursts and flares of X-rays and gamma-rays. Of the approximately thirty magnetars currently known in our Galaxy and Magellanic Clouds, five have exhibited transient radio pulsations. Fast radio bursts (FRBs) are millisecond-duration bursts of radio waves arriving from cosmological distances. Some have been seen to repeat. A leading model for repeating FRBs is that they are extragalactic magnetars, powered by their intense magnetic fields. However, a challenge to this model has been that FRBs must have radio luminosities many orders of magnitude larger than those seen from known Galactic magnetars. Here we report the detection of an extremely intense radio burst from the Galactic magnetar SGR 1935+2154 using the Canadian Hydrogen Intensity Mapping Experiment (CHIME) FRB project. The fluence of this two-component bright radio burst and the estimated distance to SGR 1935+2154 together imply a 400-800 MHz burst energy of $\sim 3 \times 10^{34}$ erg, which is three orders of magnitude brighter than those of any radio-emitting magnetar detected thus far. Such a burst coming from a nearby galaxy would be indistinguishable from a typical FRB. This event thus bridges a large fraction of the radio energy gap between the population of Galactic magnetars and FRBs, strongly supporting the notion that magnetars are the origin of at least some FRBs.
description: Submitted to Nature. This version: Geocentric arrival time corrected
Semiclassical orthogonal polynomials, matrix models and isomonodromic tau functions
Creators: name: Bertola, M.
name: Eynard, B.
name: Harnad, J.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: Classical Analysis and ODEs (math.CA)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: The differential systems satisfied by orthogonal polynomials with arbitrary semiclassical measures supported on contours in the complex plane are derived, as well as the compatible systems of deformation equations obtained from varying such measures. These are shown to preserve the generalized monodromy of the associated rank-2 rational covariant derivative operators. The corresponding matrix models, consisting of unitarily diagonalizable matrices with spectra supported on these contours are analyzed, and it is shown that all coefficients of the associated spectral curves are given by logarithmic derivatives of the partition function or, more generally, the gap probablities. The associated isomonodromic tau functions are shown to coincide, within an explicitly computed factor, with these partition functions.
description: 31 pages, 1 figure
Impactes do Preço da Água na Agricultura no Perímetro Irrigado do Vale de Caxito
Creators: name: Jerónimo, Jaime Agostinho
name: Henriques, Pedro Damião
name: Carvalho, Maria Leonor Da Silva
name: Jerónimo, Jaime Agostinho
name: Henriques, Pedro Damião
name: Carvalho, Maria Leonor Da Silva
Publisher: name: Unknown
Year: 2015
Subjects: subject: Agribusiness
subject: Water resources
subject: Water price
subject: Linear programming.

description: Increased pressure on water resources has led many countries to reconsider the mechanisms used in the induction of efficient water use, especially for irrigated agriculture, a major consumer of water. Establishing the correct price of water is one of the mechanisms for more efficient allocation of water. This paper aims to analyze the economic, social and essenenvironmental impacts of water price policies. The methodology used is the linear programming, applied to the Irrigated Valley Caxito, in Bengo Province, 45 kilometers from Luanda, which has the river Dande as its source. Three scenarios concerning water price policies were tested: simple volumetric rate, variable volumetric rate and flat rate per surface. The main findings show that from the point of view of the efficient use of water in agriculture, the best results are obtained with variable volumetric rate; from the social point of view, the simple volumetric rate has the best results; the volume variable rate method proved to be the most penalizing, quickly reducing the area of most water consuming cultures, being the method in which the environmental objectives would be more readily achieved. Either methods bring negative aspects in relation to the reduction of total gross margin.
Tracing the geometry around a massive, axisymmetric body to measure, through gravitational waves, its mass moments and electromagnetic moments
Creators: name: Sotiriou, T. P.
name: Apostolatos, T. A.
Publisher: name: arXiv
Year: 2004
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The geometry around a rotating massive body, which carries charge and electrical currents, could be described by its multipole moments (mass moments, mass-current moments, electric moments, and magnetic moments). When a small body is orbiting this massive body, it will move on geodesics, at least for a time interval that is short with respect to the characteristic time of the binary due to gravitational radiation. By monitoring the waves emitted by the small body we are actually tracing the geometry of the central object, and hence, in principle, we can infer all its multipole moments. This paper is a generalization of previous similar results by Ryan. The fact that the electromagnetic moments of spacetime can be measured demonstrates that one can obtain information about the electromagnetic field purely from gravitational wave analysis. Additionally, these measurements could be used as a test of the no-hair theorem for black holes.
description: Submitted to Phys. Rev. D
title: Deep geothermal energy - the risk of non-discovery of the hydrothermal resource
Creators: name: Saurer, Walter
Publisher: name: TU Wien
Year: 2017
Subjects: subject: Geothermal Energy
subject: Hydrothermal Resource

description: The non-discovery of the hydrothermal resource is the main investment risk for deep geothermal. The core question of this master thesis is how to depict the risk of nondiscovery at the investigated site at Baden in an investment decision calculation. Thus I have chosen Percentiles of flow of water and temperature of the hydrothermal resource to calculate expected distributions of installable capacities and respective distributions of generation costs. For P50 (120 l/s), P40 (62 l/s) and P20 (12 l/s) flow rate of water expected generation costs range from 5-15 € / MWhth for P50 (120 l/s = 50% probability), 8-29 € / MWhth for P40 (62 l/s = 60% probability) and 44-131 € / MWhth for P20 (12 l/s = 80% probability). Distributions of generation costs are calculated with Percentiles P10-P90 for temperature gradient and with net present value method. Limit of the method of approach and derived conclusions is the question whether the Geological Model correctly reflects expected depth, flow rate and temperature of the hydrothermal resource. Since the Geological Model derived from GeoHeat.at is best available data, it is assumed for this work that indicated depth of rock layers and Percentiles for temperature and flow rate of the hydrothermal resource are correct. Prospective market sales price is assumed with 36 € / MWhth and thus the site of Baden may be profitable for geothermal heat production. In order to depict the riskof non-discovery in an investment decision calculation it can be either used a higherdiscount rate (reflecting the risk of non-discovery) or if a risk insurance against nondiscovery is possible, this is shown in investment costs (premium for risk insurance). To solve the risk of non-discovery from an economic point of view the investment risk needs to be spread across a given portfolio as it is done in the oil and gas industry (Portfolio Approach) which would make it possible to insure individual geothermal drilling project against the risk of non-discovery. Given the geological risk whether the hydrothermal resource is found in sufficient quantity (l/s) and quality (°C) the establishment of an international or European Geothermal Risk Insurance Fund (EGRIF) may be able to solve the investment risk of non-discovery. This can facilitate market deployment of deep geothermal energy especially in low and medium enthalpy areas.
Photon emission in a hot QCD plasma
Creators: name: Aurenche, Patrick
Publisher: name: arXiv
Year: 2004
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Various mechanisms of thermal photon production are reviewed and their implications for heavy ion collisions are briefly sketched.
description: Talk given at Strong and Electroweak Matter 2004, Helsinki, Finland, June 2004
Study of spider pulsar binary eclipses and discovery of an eclipse mechanism transition
Creators: name: Polzin, E. J.
name: Breton, R. P.
name: Bhattacharyya, B.
name: Scholte, D.
name: Sobey, C.
name: Stappers, B. W.
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We present a comparative study of the low-frequency eclipses of spider (compact, irradiating binary) PSRs B1957+20 and J1816+4510. Combining these data with those of three other eclipsing systems we study the frequency dependence of the eclipse duration. PSRs B1957+20 and J1816+4510 have similar orbital properties, but the companions to the pulsars have masses that differ by an order of magnitude. A dedicated campaign to simultaneously observe the pulsed and imaged continuum flux densities throughout the eclipses reveals many similarities between the excess material within the two binaries, irrespective of the companion star properties. The observations show that the pulsar fluxes are removed from the line of sight throughout the main body of the eclipses. For PSR J1816+4510 we present the first direct evidence of an eclipse mechanism that transitions from one that removes the pulsar flux from the line of sight to one that merely smears out pulsations, and claim that this is a consequence of scattering in a tail of material flowing behind the companion. Inferred mass loss rates from the companion stars are found to be $\dot{M}_{\text{C}} \sim 10^{-12}~M_\odot$~yr$^{-1}$ and $\dot{M}_{\text{C}} \sim 2 \times 10^{-13}~M_\odot$~yr$^{-1}$ for PSR B1957+20 and PSR J1816+4510, respectively; seemingly too low to evaporate the stars within Hubble time. Measurements of eclipse durations over a wide range of radio-frequencies show a significant dependence of eclipse duration on frequency for all pulsars, with wider eclipses at lower-frequencies. These results provide a marked improvement in the observational constraints available for theoretical studies of the eclipse mechanisms.
description: Accepted for publication in MNRAS
The ASEAN Strategic Plan 2016-25 for Food, Agriculture and Forestry: The Livestock Sub-Sector
Creators: name: Jabbar, Mohammad A.
name: Jabbar, Mohammad A.
Publisher: name: Unknown
Year: 2014
Subjects: subject: Agricultural and Food Policy
subject: Food Security and Poverty
subject: International Relations/Trade
subject: Livestock Production/Industries
subject: Research and Development/Tech Change/Emerging Technologies
subject: ASEAN Economic Community
subject: plan of action
subject: strategic plan
subject: agriculture
subject: food
subject: forestry
subject: livestock

description: In order to establish the ASEAN Economic Community, a plan of action was prepared for the Food, Agriculture and Forestry Sector for the period ending 2015. In this paper, the progress made in the implementation of the plan for the livestock subsector was reviewed and a new strategic plan for the subsector for the period 2016-25 has been developed.
description: Report prepared for the ASEAN Secretariat with technical Assistance of FAORAP
Nest representations of directed graph algebras
Creators: name: Davidson, Kenneth
name: Katsoulis, Elias
Publisher: name: arXiv
Year: 2004
Subjects: subject: Operator Algebras (math.OA)
subject: Functional Analysis (math.FA)
subject: FOS: Mathematics

description: This paper is a comprehensive study of the nest representations for the free semigroupoid algebra $\flgee$ of countable directed graph $G$ as well as its norm-closed counterpart, the tensor algebra $\T^{+}(G)$. We prove that the finite dimensional nest representations separate the points in $\flgee$, and a fortiori, in $\T^{+}(G)$. The irreducible finite dimensional representations separate the points in $\flgee$ if and only if $G$ is transitive in components (which is equivalent to being semisimple). Also the upper triangular nest representations separate points if and only if for every vertex $x \in \V(G)$ supporting a cycle, $x$ also supports at least one loop edge. We also study \textit{faithful} nest representations. We prove that $\flgee$ (or $\T^{+}(G)$) admits a faithful irreducible representation if and only if $G$ is strongly transitive as a directed graph. More generally, we obtain a condition on $G$ which is equivalent to the existence of a faithful nest representation. We also give a condition that determines the existence a faithful nest representation for a maximal type $\bN$ nest.
description: accepted version for Proc. Lomdon Math. Soc., minor changes
ASEAN Strategic Plan of Action for the Livestock Sub-Sector 2016-20
Creators: name: Jabbar, Mohammad A.
name: Jabbar, Mohammad A.
Publisher: name: Unknown
Year: 2015
Subjects: subject: Agricultural and Food Policy
subject: Food Security and Poverty
subject: International Relations/Trade
subject: Livestock Production/Industries
subject: Research and Development/Tech Change/Emerging Technologies
subject: ASEAN Economic community
subject: agriculture
subject: livestock
subject: strategic plan of action

description: A new strategic vision for Food and Agriculture and Forestry sector of the ASEAN has been developed for 2016-25 period to implement the AEAN Economic Community. As a follow up of that, in this paper a strategic plan of action for the livestock sector has been developed for 2016-20 period.
description: Prepared for the ASEAN Secretariat with Technical assistance from the FAO RAP.
Evidence for B_s production at the Upsilon(5S) from CLEO and properties of the Upsilon(4S) from BaBar
Creators: name: Wang, J. C.
Publisher: name: arXiv
Year: 2004
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: BaBar experiment scan around the Upsilon(4S) resonance and measure its mass and full width. They also measure Br(Upsilon(4S) -> B0 B0b) = 0.486 +/- 0.010 +/- 0.009 from 81.7 fb-1 Upsilon(4S) data. CLEO collaboration took about 0.42 fb-1 Upsilon(5S) data. They search for B_s in both inclusive and exclusive modes and find evidence for B_s production at the Υ(5S) and Br(Upsilon(5S) -> B_s^(*) B_s^(*)b) = (21 +/- 3 +/- 9)%.
description: 4 pages, 3 figures, ICHEP 2004 conference proceedings (minor change in references)
Modelos de impacto en la agricultura teniendo en cuenta los escenarios de la agricultura del cambio climático
Creators: name: Vázquez-Montenegro, Ranses José
name: Durán-Zarabozo, Odil
name: Baca, Marcio
name: Vázquez-Montenegro, Ranses José
name: Durán-Zarabozo, Odil
name: Baca, Marcio
Publisher: name: Unknown
Year: 2015
Subjects: subject: Environmental Economics and Policy
subject: Resource /Energy Economics and Policy
subject: Cambio Climático
subject: Modelos de análisis
subject: Modelos empíricos

description: La presente reseña o recopilación de estudios realizados en Cuba y Nicaragua, tiene como propósito examinar, los impactos potenciales del cambio climático sobre el sector agropecuario mediante el uso de la modelación, con el fin de brindar elementos que puedan tomarse en cuenta para la formulación de políticas agropecuarias y ambientales, ya que conocer los posibles impactos del cambio climático, es un primer paso hacia la acción eficaz. Se analizan los posibles impactos de las variaciones de las variables climáticas sobre el sector agropecuario, sobre algunos de los cultivos más importantes. Asimismo se contabilizan los impactos económicos a través escenarios climáticos futuros. El estudio en el sector de agricultura arrojó una amplia gama de resultados que abarcan tanto consecuencias perjudiciales como beneficiosas, en función de que los niveles del efecto de fertilización por CO2 (estimados en los laboratorios) se alcancen en la práctica para las plantas de ciclo fotosintético C3.
$Z_N$ Orientifolds with Flux
Creators: name: Font, Anamaria
Publisher: name: arXiv
Year: 2004
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We compute the flux induced tadpole and superpotential in various type IIB $Z_N$ compact orientifolds in order to study moduli stabilization. We find supersymmetric vacua with $g_s < 1$ and describe brane configurations with cancelled tadpoles. In some cases moduli are only partially fixed unless anti D3-branes are included.
description: 13 pages, Latex
Cryptocurrencies: An Economic Perspective
Creators: name: Wenzong Jin
Publisher: name: Carnegie Mellon University
Year: 2020
Subjects: subject: 140303 Economic Models and Forecasting
subject: FOS: Economics and business
subject: 140207 Financial Economics

description: Are cryptocurrencies indeed currencies? Anecdotal evidence on the volatility of cryptocurrency prices suggest that these “currencies” are not a good store of value, and similarly the time delays in validating and publishing crypto-based transactions suggest that they are not a good medium of exchange either. Due to the context it is defined in, it seems to not follow social conventions of fiat currencies. In this thesis, we undertake a systematic evaluation of how much do cryptocurrency prices behave like fiat currency prices, focusing on the predominant cryptocurrency — Bitcoin. We test the usefulness of various time series and structural models to predict future changes in Bitcoin prices and conclude that when predicting out of sample, its price is as unpredictable as fiat currency prices. Since cryptocurrencies generally have no central authority and hence receive no regulation, we explore its country-dependent characteristics, and find that the overall conclusions apply. We also examine if nominal interest rate differentials denominated in fiat currencies versus Bitcoin predict exchange rate movements, and find that in addition to the persistent violation in short-run, interest parity suggest that Bitcoin price has not been rising fast enough. We conclude that we have to refine the definition of monetary parameters on cryptocurrencies to better capture its properties, but as far as our examination indicates, the price of the predominant cryptocurrencies behaves similarly to most fiat currencies. In our point of view, Bitcoin is a currency.
EFFECTS OF SELECTED ASANAS AND RELAXATION TECHNIQUE ON COMPETITIVE SPORTS ANXIETY AMONG VOLLEYBALL PLAYERS
Creators: name: Saravanan Elumalai
Publisher: name: figshare
Year: 2020
Subjects: subject: 130210 Physical Education and Development Curriculum and Pedagogy
subject: FOS: Educational sciences

description: Yoga makes a perfect companion for athletes of all sports. Yoga poses are all about building core strength. Routinepractice of yoga incorporates slow and steady, physicalexercise that is ideal for all sports participants. Besidesthat, frequent practice of yoga helps the sports participants
On the non-existence of totally localised intersections of D3/D5 branes in type IIB SUGRA
Creators: name: Patiño, Leonardo
name: Smith, Douglas J.
Publisher: name: arXiv
Year: 2004
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In the present paper we study the most general configuration of intersecting D3/D5 branes in type IIB supergravity satisfying Poincare invariance in the directions common to the branes and SO(3) symmetry in the totally perpendicular directions. The form of these configurations is greatly restricted by the Killing spinor equations and the equations of motion, which among other things, force the Ramond-Ramond scalar to be zero and do not permit the existence of totally localised intersections of this kind.
description: 13 pages, Typos corrected
Análisis de estrategia de información y divulgación agra meteorológica para llegar a los productores
Creators: name: Vázquez-Montenegro, Ranses José
name: Durán-Zarabozo, Odil
name: Baca, Marcio
name: Marinero-Orantes, Edgard Antonio
name: Guerrero, Francisco José
name: Vázquez-Montenegro, Ranses José
name: Durán-Zarabozo, Odil
name: Baca, Marcio
name: Marinero-Orantes, Edgard Antonio
name: Guerrero, Francisco José
Publisher: name: Unknown
Year: 2015
Subjects: subject: Environmental Economics and Policy
subject: Resource /Energy Economics and Policy
subject: Agro meteorología
subject: boletines
subject: sistema de información

description: Las demandas de una información agro meteorológica oportuna y eficaz para las aplicaciones agrícolas han ido en aumento durante los últimos años. Los boletines constituyen la fuente principal para brindar el servicio operacional de información meteorológica y agro meteorológica a la agricultura. Ellos están concebidos para brindar al usuario un sistema especializado que considerada para la toma de decisiones, tanto a nivel nacional del país como a nivel de localidades, con conocimiento de causa. Se presenta la línea de pensamiento y accionar que los agro meteorólogos cubanos llevan a cabo, a fin de lograr un enlace eficaz entre los encargados de producir información científica y los productores agrícolas.
Servicios ambientales y gestión de los recursos hídricos utilizando el modelo WEAP: casos de estudio en Iberoamérica.
Creators: name: Geler-Roffe, Tatiana
name: Toruño, Pedro José
name: Marinero-Orantes, Edgar Antonio
name: Gutiérrez-Espinoza, Eva Isabel
name: Geler-Roffe, Tatiana
name: Toruño, Pedro José
name: Marinero-Orantes, Edgar Antonio
name: Gutiérrez-Espinoza, Eva Isabel
Publisher: name: Unknown
Year: 2015
Subjects: subject: Environmental Economics and Policy
subject: Resource /Energy Economics and Policy
subject: Bioeconomía
subject: Servicios Ambientales
subject: Pago por Servicios Ambientales
subject: gestión de los recursos hídricos
subject: modelo hidrológico WEAP.

description: En el presente trabajo, se identifican las experiencias de los países Iberoamericanos que han aplicado la Bioeconomía en el sendero de los Servicios Ambientales (SA) de regulación hídrica y calidad del agua, como parte de la gestión de los recursos hídricos ante los impactos del cambio climático. Se realizó la revisión de documentos y casos de aplicación de esquemas de Pago por Servicios Ambientales (PSA) en América Latina y Caribe (ALC). Se incorpora, además, la aplicación del modelo hidrológico WEAP (Water Evaluation and Planning System) como modelo para la gestión de los recursos hídricos. Se hace una revisión de los casos de aplicación de este modelo hidrológico en ALC, que permite la estimación de los SA del recurso agua y su relación con el uso del suelo y los cambios climáticos.
Statistical Modelling of Dynamic Interference Threshold and Its Effect on Network Capacity
Creators: name: Kachroo, Amit
name: Ekin, Sabit
name: Imran, Ali
Publisher: name: arXiv
Year: 2020
Subjects: subject: Signal Processing (eess.SP)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: In this paper, we present the case of utilizing interference temperature (IT) as a dynamic quantity rather than as a fixed quantity in an orthogonal frequency division multiple access (OFDMA) based spectrum sharing systems. The fundamental idea here is to reflect the changing capacity demand of primary user (PU) over time in setting the interference power threshold for secondary user (SU). This type of dynamic IT will allow the SU to opportunistically have higher transmit power during relaxed IT period, thereby resulting in higher network capacity. The cognitive radio network (CRN) considered in this paper has an underlay network configuration in which the available spectrum of the PU is accessed concurrently by SU provided that the interference power at the PU receiver from SU is under a certain power threshold. This power threshold is set to maintain and guarantee a certain level of quality of service (QoS) for PU network. Theoretical expressions for outage probability and mean capacity for SU network are derived, and validated with simulation results, and it is observed that utilizing dynamic IT results in high network performance gains as compared to utilizing a fixed IT in cognitive radio system.
description: 13 pages, 13 figures, IEEE Transactions on Vehicular Technology
Directed and elliptic flow in Au + Au at intermediate energies
Creators: name: Lukasik, J.
name: Auger, G.
name: Begemann-Blaich, M. L.
name: Bellaize, N.
name: Bittiger, R.
name: Bocage, F.
name: Borderie, B.
name: Bougault, R.
name: Bouriquet, B.
name: Charvet, J. L.
name: Chbihi, A.
name: Dayras, R.
name: Durand, D.
name: Frankland, J. D.
name: Galichet, E.
name: Gourio, D.
name: Guinet, D.
name: Hudan, S.
name: Lautesse, P.
name: Lavaud, F.
name: Fevre, A. Le
name: Legrain, R.
name: Lopez, O.
name: Lynen, U.
name: Mueller, W. F. J.
name: Nalpas, L.
name: Orth, H.
name: Plagnol, E.
name: Rosato, E.
name: Saija, A.
name: Schwarz, C.
name: Sfienti, C.
name: Tamain, B.
name: Trautmann, W.
name: Trzcinski, A.
name: Turzo, K.
name: Vient, E.
name: Vigilante, M.
name: Volant, C.
name: Zwieglinski, B.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: Directed and elliptic flow for the Au + Au system at incident energies between 40 and 150 MeV per nucleon has been measured using the INDRA 4 pi multi-detector. For semi-central collisions, the elliptic flow of Z <= 2 particles switches from in-plane to out-of-plane enhancement at around 100 MeV per nucleon, in good agreement with the result reported by the FOPI Collaboration. The directed flow changes sign at a bombarding energy between 50 and 60 MeV per nucleon and remains negative at lower energies. The conditions for the appearance and possible origins of negative flow are discussed.
description: 12 pages, 6 eps figures, elsart, submitted to Phys. Lett. B
Maxwell-Klein-Gordon fields in black hole spacetimes
Creators: name: Petryk, Roman J. W.
Publisher: name: University of British Columbia
Year: 2010

description: In this thesis I present results for the evolution and dynamics of massive electromagnetically coupled Maxwell-Klein-Gordon fields in black hole spacetimes. The first part of my investigation for gravitationally and electromagnetically self-interacting fields in spherical symmetry reveals two distinct types of solution at the threshold of black hole formation. For fields with relatively small mass parameter I observe Type II discretely self-similar behaviour for the critical solutions and obtain the black hole mass and charge scaling relations. However, when the mass parameter is sufficiently large a different type of critical solution is obtained.. This new solution is periodic and resembles a perturbed charged boson star solution. This new solution exhibits Type I critical behaviour and its lifetime obeys a well-defined scaling law. The second aspect of investigation involves massive electromagnetically coupled scalar field perturbations in axial symmetry on a Kerr black hole spacetime. Here, results show that both the mass and charge coupling parameters play a significant role in the field dynamics on the spacetime background. For relatively weak parameter values the perturbations exhibit strong gravitational interaction through the phenomenon of orbiting resonances. In the case of pure electromagnetic perturbation there is also evidence of superradiant scattering when the black hole rotation is large. When the parameter values are large both the physics and complexity of the dynamics change. For intermediate values of the mass and charge parameter, the perturbations exhibit trapping and a preference for scattering along the axis of black hole rotation. Finally, all electromagnetically coupled solutions generically display charge separation and dynamo-like behaviour.
Aspectos medioambientales en los análisis de eficiencia
Creators: name: Dios-Palomares, Rafaela
name: José-Diz, David Alcaide
name: Jurado, Manuel
name: Guijarro, Angel Prieto
name: Martinez-Paz, J. M.
name: Zúniga-González, Carlos Alberto
name: Dios-Palomares, Rafaela
name: José-Diz, David Alcaide
name: Jurado, Manuel
name: Guijarro, Angel Prieto
name: Martinez-Paz, J. M.
name: Zúniga-González, Carlos Alberto
Publisher: name: Unknown
Year: 2015
Subjects: subject: Environmental Economics and Policy
subject: Productivity Analysis
subject: Resource /Energy Economics and Policy
subject: Eficiencia
subject: Productividad
subject: Cambio Climático
subject: Eficiencia ambiental

description: El presente estudio se focalizó en una revisión de investigaciones aplicadas utilizando variables agroclimáticas con la incorporación de efectos medio ambientales en el análisis de la eficiencia. Se consideró el análisis econométrico, el enfoque de la eficiencia técnico-ambiental, el enfoque eco-eficiencia, el enfoque metafronteras, enfoque de la eficiencia ambiental, el balance de materiales. Las conclusiones del estudio evidencia la necesidad de utilizar el análisis de eficiencia u productividad considerando los factores medioambientales y las variaciones del cambio climático. La importancia de estos factores incide en los procesos productivos para medir la eficiencia y la productividad. Se recomienda la investigación en el desarrollo de nuevas metodologías en esta parcela del análisis de eficiencia, y también que se apliquen las ya existentes para no llegar a malas estimaciones al no considerar la realidad que nos rodea.
High Precision Measurements of $θ_{\odot}$ in Solar and Reactor Neutrino Experiments
Creators: name: Bandyopadhyay, Abhijit
name: Choubey, Sandhya
name: Goswami, Srubabati
name: Petcov, S. T.
Publisher: name: arXiv
Year: 2004
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Astrophysics (astro-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: We discuss the possibilities of high precision measurement of the solar neutrino mixing angle $θ_\odot \equiv θ_{12}$ in solar and reactor neutrino experiments. The improvements in the determination of $\sin^2θ_{12}$, which can be achieved with the expected increase of statistics and reduction of systematic errors in the currently operating solar and KamLAND experiments, are summarised. The potential of LowNu $ν-e$ elastic scattering experiment, designed to measure the $pp$ solar neutrino flux, for high precision determination of $\sin^2θ_{12}$, is investigated in detail. The accuracy in the measurement of $\sin^2θ_{12}$, which can be achieved in a reactor experiment with a baseline $L \sim (50-70)$ km, corresponding to a Survival Probability MINimum (SPMIN), is thoroughly studied. We include the effect of the uncertainty in the value of $\sin^2θ_{13}$ in the analyses. A LowNu measurement of the $pp$ neutrino flux with a 1% error would allow to determine $\sin^2θ_{12}$ with an error of 14% (17%) at 3$σ$ from a two-generation (three-generation) analysis. The same parameter $\sin^2θ_{12}$ can be measured with an uncertainty of 2% (6%) at 1$σ$ (3$σ$) in a reactor experiment with $L \sim60 $ km, statistics of $\sim$60 GWkTy and systematic error of 2%. For the same statistics, the increase of the systematic error from 2% to 5% leads to an increase in the uncertainty in $\sin^2θ_{12}$ from 6% to 9% at 3$σ$. The inclusion of the $\sin^2θ_{13}$ uncertainty in the analysis changes the error on $\sin^2θ_{12}$ to 3% (9%). The effect of $\sin^2θ_{13}$ uncertainty on the $\sin^2θ_{12}$ measurement in both types of experiments is considerably smaller than naively expected.
description: Final version
Comments to the paper by L. Durand and P. Ha on Coulomb-nuclear interference
Creators: name: Petrov, V. A.
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: This is a brief analysis of the basic formula from arXiv:2007.07827. Some inconsistency has been identified.
description: 3 pages
Simple route to non-Gaussianity in inflation
Creators: name: Rigopoulos, G. I.
name: Shellard, E. P. S.
name: van Tent, B. J. W.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present a simple way to calculate non-Gaussianity in inflation using fully non-linear equations on long wavelengths with stochastic sources to take into account the short-wavelength quantum fluctuations. Our formalism includes both scalar metric and matter perturbations, combining them into variables which are invariant under changes of time slicing in the long-wavelength limit. We illustrate this method with a perturbative calculation in the single-field slow-roll case. We also introduce a convenient choice of variables to graphically present the full momentum dependence of the three-point correlator.
description: 6 pages, 2 figures. v2: Updated formalism to version described in astro-ph/0504508, leading to dropping of one unnecessary approximation. Final results not significantly changed. Extended discussion of calculation and added graphical presentation of full momentum dependence. References corrected and added. v3: Final version, only small textual changes