cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
The Dragonfly Nearby Galaxies Survey. I. Substantial variation in the diffuse stellar halos around spiral galaxies
Creators: name: Merritt, Allison
name: van Dokkum, Pieter
name: Abraham, Roberto
name: Zhang, Jielai
Publisher: name: arXiv
Year: 2016
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Galaxies are thought to grow through accretion; as less massive galaxies are disrupted and merge over time, their debris results in diffuse, clumpy stellar halos enveloping the central galaxy. Here we present a study of the variation in the stellar halos of galaxies, using data from the Dragonfly Nearby Galaxies Survey (DNGS). The survey consists of wide field, deep ($μ_{g} > 31$ mag arcsec$^{-2}$) optical imaging of nearby galaxies using the Dragonfly Telephoto Array. Our sample includes eight spiral galaxies with stellar masses similar to that of the Milky Way, inclinations of $16-90$ degrees and distances between $7-18$ Mpc. We construct stellar mass surface density profiles from the observed $g$-band surface brightness in combination with the $g-r$ color as a function of radius, and compute the halo fractions from the excess stellar mass (relative to a disk$+$bulge fit) beyond $5$ half-mass radii. We find a mean halo fraction of $0.009 \pm 0.005$ and a large RMS scatter of $1.01^{+0.9}_{-0.26}$ dex. The peak-to-peak scatter is a factor of $>100$ -- while some galaxies feature strongly structured halos resembling that of M31, three of the eight have halos that are completely undetected in our data. We conclude that spiral galaxies as a class exhibit a rich variety in stellar halo properties, implying that their assembly histories have been highly non-uniform. We find no convincing evidence for an environmental or stellar mass dependence of the halo fraction in the sample.
description: Resubmitted to ApJ after addressing comments from the referee
Determinants of Commercial Banks' lending: Evidence from Ethiopia
Creators: name: Getachew, Zelalem
Publisher: name: National Academic Digital Repository of Ethiopia
Year: 2011

description: The study was aimed to investigate the effect of Bank specific,regulatory and Macro economic factors on Ethiopian commercial banks' lending or loan and advances. In order to achieve research objective the researcher used quantitative research approach. The analyses were performed using panel data derived from the financial statements of sampled Ethiopian commercial banks and macro-economic data from National bank of Ethiopia. Ordinary least square (OLS) technique was applied to determine the impact of those predictor variables on commercial bank lending. In the study bank size, volume of deposit, cash reserve requirement, credit risk, liquidity ratio, lending interest rate, GDP and inflation of the country were considered as independent variables whereas commercial banks' lending or loan and advances was considered as dependent variable. The result of the regression analysis reveals that Ethiopian commercial banks' lending is determined by bank size (asset), volume of deposit and GDP growth, positively and by cash reserves requirement and liquidity ratio negatively. On the other hand credit risk, lending interest rate and inflation has insignificant impact on Ethiopian commercial banks' lending or loan and advances. The study suggests that Ethiopian commercial banks should enhance their strategies in mobilizing deposits from the public and have to strive to strength their asset size. In addition commercial banks' should manage their liquidity and administer their lending activity by considering internal factors, existing economic situation, competitive environment, regulatory measures and their target customers. Key words: lending, cash reserve requirement, volume of deposit, liquidity ratio, bank size
Optical Identification of Cepheids in 19 Host Galaxies of Type Ia Supernovae and NGC 4258 with the Hubble Space Telescope
Creators: name: Hoffmann, Samantha L.
name: Macri, Lucas M.
name: Riess, Adam G.
name: Yuan, Wenlong
name: Casertano, Stefano
name: Foley, Ryan J.
name: Filippenko, Alexei V.
name: Tucker, Brad E.
name: Chornock, Ryan
name: Silverman, Jeffrey M.
name: Welch, Douglas L.
name: Goobar, Ariel
name: Amanullah, Rahman
Publisher: name: arXiv
Year: 2016
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present results of an optical search for Cepheid variable stars using the Hubble Space Telescope (HST) in 19 hosts of Type Ia supernovae (SNe Ia) and the maser-host galaxy NGC 4258, conducted as part of the SH0ES project (Supernovae and H0 for the Equation of State of dark energy). The targets include 9 newly imaged SN Ia hosts using a novel strategy based on a long-pass filter that minimizes the number of HST orbits required to detect and accurately determine Cepheid properties. We carried out a homogeneous reduction and analysis of all observations, including new universal variability searches in all SN Ia hosts, that yielded a total of 2200 variables with well-defined selection criteria -- the largest such sample identified outside the Local Group. These objects are used in a companion paper to determine the local value of H0 with a total uncertainty of 2.4%.
description: ApJ, in press. v2 adds missing co-author to arXiv metadata and text in acknowledgments
Inducing Superconducting Correlation in Quantum Hall Edge States
Creators: name: Lee, Gil-Ho
name: Huang, Ko-Fan
name: Efetov, Dmitri K.
name: Wei, Di S.
name: Hart, Sean
name: Taniguchi, Takashi
name: Watanabe, Kenji
name: Yacoby, Amir
name: Kim, Philip
Publisher: name: arXiv
Year: 2016
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: The quantum Hall (QH) effect supports a set of chiral edge states at the boundary of a 2-dimensional electron gas (2DEG) system. A superconductor (SC) contacting these states induces correlation of the quasi-particles in the dissipationless 1D chiral QH edge states. If the superconducting electrode is narrower than the superconducting coherence length, the incoming electron are correlated to outgoing hole along the chiral edge state by the Andreev process. In order to realize this crossed Andreev conversion (CAC), it is necessary to fabricate highly transparent and nanometer-scale superconducting junctions to QH system. Here we report the observation of CAC in a graphene QH system contacted with a nanostructured NbN superconducting electrode. The chemical potential of the edge states across the superconducting electrode exhibits a sign reversal, providing direct evidence of CAC. This hybrid SC/QH system is a novel route to create isolated non-Abelian anyonic zero modes, in resonance with the chiral QH edge.
description: 10 pages, 8 figures
Practices and Challenges of VAT Implementation in Ethiopia Post January 2003 Assessment.
Creators: name: Belete, Bizualem
Publisher: name: National Academic Digital Repository of Ethiopia
Year: 2015

description: The objective of the study is to examine the nature, practices, and challenges of VAT implementation in Ethiopia and identify areas of weaknesses and strengths towards the achievement of VAT Objectives. In doing so, the paper further assesses the impact of VAT to gross domestic product and total government revenues. The study used both qualitative and quantitative research methods to collect and analyze both primary and secondary data. Self-administered questionnaires to the ERCA employees and VAT registered respectively were used to collect primary data. Secondary data was collected from ERCA, MoFED by way of reviewing documents from previous studies. The Statistical Package for Social Sciences (SPSS) version 17 and STATA 11 was the method used for quantitative data analysis The study paper discovered that during the implementation of Valued Added Tax since the year 2003 till to date; the major challenges hindering ERCA from generating what was initially planned are: lack of sufficient number of skilled personnel, limited staff capacity, nonresponsiveness by the management, limited awareness creation, problems related with invoicing, unfair competition, and control centered management tendency. The paper suggests that in Ethiopia, attempting to implement what is legislated in the main areas deserves the Government's due attention. The study also emphasizes the need to strengthen the administration capacity in general and the VAT collection system in particular as efficiently as possible. The empirical analysis disclosed that VAT contributes significantly to the increase of the total government revenue and the economic growth of Ethiopia at large. Finally, if Ethiopia joins the World Trade Organization, the country needs to enhance domestic based resources mainly generated from Value Added Tax. In this regard, the paper has far-reaching policy implication in an effort to improve tax collection. Keywords; VAT, WTO, government revenue, unfair competition, GDP
A graphical front end for an adaptive shelf organizing feature map
Creators: name: Akarawita, Mangala Priyadarshana.
Publisher: name: Monash University
Year: 2022

description: This thesis was scanned from the print manuscript for digital preservation and is copyright the author.
 Researchers can access this thesis by asking their local university, institution or public library to
 make a request on their behalf. Monash staff and postgraduate students can use the link in the References field.
GDI: D3.1 - Node mapping to TRLs
Creators: name: Hovig, Eivind
name: Petersen, Kjell
Publisher: name: Zenodo
Year: 2023

description: The main deliverable scope was to map the Technical Readiness Levels (TRLs) of the participating GDI nodes. The nodes perform self-reporting for the purpose of establishing the operational readiness-level. In order to achieve this, the technical aspects from the overall readiness tool were used for this deliverable. After 3 months in the project, the tool has been applied for the first time. Not all nodes were able to complete the self-reporting in time. The vanguard nodes were in general further along than the other nodes, but none of the nodes had achieved all of the technical prerequisites to progress from “onboarding” into the “deployment” phase. It is expected that this will change at the M08 milestone, where a minimum of 5 nodes are to have the five core functionalities established. Continuous progress monitoring and follow-up will be important to lay the ground for more consistent and representative progress reporting in the coming phases of the project.
description: GDI project receives funding from the European Union's Digital Europe Programme under grant agreement number 101081813.
Study on Supply Chain Management Practices-A Case Study of Kality Food Share Company
Creators: name: Balda, Assefa
Publisher: name: National Academic Digital Repository of Ethiopia
Year: 2011

description: Supply chain management (SCM) is the means by which firms engaged in creating, distributing, and selling products, can join forces to establish a supply network with an unbeatable competitive advantage-has emerged as one of the most powerful businessimprovement tools around. Companies all over the world are pursuing supply chain as the latest methodology to reduce costs, increase customer satisfaction, better utilize assets, and build new revenues. The purpose of this paper is to study the practices of supply chain management from the five SCM practices perspectives i.e Supplier and customer relationship, internal operations, information sharing, information technology and training and to see the integrations among SC partners. For the accomplishment of this, the study was employed through descriptive design in which the selections of the respondents were carried out by using judgmental, purposive and convenience sampling techniques. The total numbers of KFSC employees are 456 out these, 35 employees was considered as a sample unit furthermore, 40 customers were interviewed. Both primary and secondary sources of data were used for this study. Likert scaled questionnaire and interviews were used as instruments for data collection. The data was analyzed by using descriptive statistics and presented in tables. The major findings indicates that, most SCM practices are moderately practiced with in the KFSC's SC. where as IT and training practices are poorly applied which represented with group mean value of 2.12 and 1.95 respectively. Sales forecast information sharing with customers is poor that convey 2.22 mean value. Based on both quantitative and qualitative analysis the case company has poor relationship with its customers and suppliers and poor customers' services. Manufacturing, supply and demand uncertainties which conveys mean value of 3.41, 2.83 and 2.77 are the major headaches or challenges of the case company's SC which prohibits effective implementation of SCM.
Influence of strain relaxation in axial (In,Ga)N/GaN nanowire heterostructures on their electronic properties
Creators: name: Marquardt, Oliver
name: Krause, Thilo
name: Kaganer, Vladimir
name: Martin-Sanchez, Javier
name: Hanke, Michael
name: Brandt, Oliver
Publisher: name: arXiv
Year: 2016
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We present a systematic study of the influence of elastic strain relaxation on the built-in electrostatic potentials and the electronic properties of axial (In,Ga)N/GaN nanowire heterostructures. We employ and evaluate analytical and numerical approaches to compute strain and polarization potentials. These two ingredients then enter an eight-band k.p model to compute electron and hole ground states and energies. Our analysis reveals that for a sufficiently large ratio between the thickness of the (In,Ga)N disk and the diameter of the nanowire, the elastic relaxation leads to a significant reduction of the built-in electrostatic potential in comparison to a planar system of similar layer thickness and In content. However, a complete elimination of the built-in potential cannot be achieved in axial nanowire heterostructures. Nevertheless, the reduction of the built-in electrostatic potential leads to a significant modification of the electron and hole energies. Our findings indicate that the range of accessible ground state transition energies in an axial (In,Ga)N/GaN nanowire heterostructure is limited due to the reduced influence of polarization potentials for thicker disks. Additionally, we find that strain and polarization potentials induce complex confinement features of electrons and holes, which depend on the In content, shape, and dimensions of the heterostructure.
Lectures in Agricultural Economics: Bicentennial Year Lectures Sponsored by the Economic Research Service
Creators: name: Schultz, Theodore W.
name: Adelman, Irma
name: Bishop, Charles E.
name: Fox, Karl A.
name: Brandow, George E.
name: Johnson, D. Gale
name: Kelso, M. M.
name: Heady, Earl O.
Publisher: name: Unknown
Year: 1977
Subjects: International Development
Political Economy
Production Economics
Research and Development/Tech Change/Emerging Technologies
Resource /Energy Economics and Policy
Teaching/Communication/Extension/Profession

description: Contents: The Economic Value of Human Time Over Time (Theodore W. Schultz) -- Policies for Equitable Growth in Developing Countries (Irma Adelman) -- The Fear of Knowledge (Charles E. Bishop) -- Measuring Economic and Social Performance: New Theory, New Methods, New Data (Karl A. Fox) -- Appraising the Economic Performance of the Food Industry (George E, Brandow) -- BAE-ERS Alumni Session (Don Paarlberg, Walter W. Wilcox, O. V. Wells, Willard W. Cochrane, M. L. Upchurch, & Nathan M. Koffsky) -- World Food Problems and U.S. Agriculture (D. Gale Johnson) -- The Political Economy of Natural Resources Policy (M. M. Kelso) -- Agricultural Production Economics in the Future (Earl O. Heady) -- BAE-ERS Alumni Session (Don Paarlberg, Walter W. Wilcox, O. V. Wells, Willard W. Cochrane, M. L. Upchurch, Nathan M. Koffsky).
On the geometrical interpretation of scale-invariant models of inflation
Creators: name: Karananas, Georgios K.
name: Rubio, Javier
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study the geometrical properties of scale-invariant two-field models of inflation. In particular, we show that when the field-derivative space in the Einstein frame is maximally symmetric during inflation, the inflationary predictions can be universal and independent of the details of the theory.
description: 14 pages, no figures
Business Process Reengineering and Organizational Performance of Third Party Logistics Service Providers in Ethiopia: The Case Of Comet Transport S.C.
Creators: name: Worku, Dereje
Publisher: name: National Academic Digital Repository of Ethiopia
Year: 2015

description: This study is about Business Process Reengineering and Organizational Performance of Third Party Logistics Service Providers in Ethiopia a case study of Comet transport. The research aimed to identify the impact of implementing BPR on the efficiency and effectiveness of 3PLS providers to be assessed by evaluating presence of significant increase on firm level performance. As BPR promises to bring about dramatic changes in firm performance outcomes, specific operational and financial performance indicators were selected for evaluation. As the study was a case study, Comet Transport Share Company was selected as a study unit and 12 years of performance data was compiled along with other pertinent information gathered through interview. Besides, BPR implementation report and other relevant documents were analyzed. Extensive literature survey was undertaken to underpin relevant performance indicators appropriate and fit to evaluate the performances of third party logistics service providers. The performance data compiled for the study was analyzed by SPSS statistical package and student t test comparisons was made pre and post BPR performance indexes. On the bases of performance data in between (2002 and 2014) E.C. Key operational and financial performance measure indexes namely Average truck turnaround time, Average Tariff per ton per km, Load factor, Labor productivity, Return on assets, profitability ratio ,cost to revenue ratio, Km travelled per year, freight ton per km, number of trucks available for operation throughout the year, truck down time throughout the year, Actual capacity utilization and other drive indexes ; Comet has exhibited significant improvement both on operational efficiencies and effectiveness as asserted by increase financial index. With 95% certainty, the study asserted the dramatic increase in all mean performances especially in revenue, profitability, reduction in cost to revenue ratio, truck availability, tone KM coverage, tonnage lifting , load factor and other indexes utilized to measure performances. Poor performance was observed with regard to reducing truck down time, and employee turnover indicating area of improvement works to be further investigated by the management of Comet.Based on strong findings of the study, the researcher concludes positive outcome of implementing BPR to have resulted enhanced performance increasing operational and financial efficiency and effectiveness and advices other companies to follow suits to reap of gains achieved by Comet Transport Company. Key words: BPR,Revenue,profitability ratio,Km travelled per year, load factor, freight ton per km, number of trucks available for operation throughout the year, truck down time, actual capacity utilization.
Transactions in an object-oriented database management system
Creators: name: Chan, Chee Kin Danny.
Publisher: name: Monash University
Year: 2022

description: This thesis was scanned from the print manuscript for digital preservation and is copyright the author.
 Researchers can access this thesis by asking their local university, institution or public library to
 make a request on their behalf. Monash staff and postgraduate students can use the link in the References field.
Explaining the discharge notation
Creators: name: Basson, Keanu
Publisher: name: figshare
Year: 2024
Subjects: classificationCode: 510399
subject: Classical physics not elsewhere classified

description: This paper attempts to explain the use of the discharge notation as well as it's rules and methods of use. The discharge notation is a technique that can be used for calculating vector magnitudes that are lost 1 second post deceleration. The main focus being velocity, but there are many other applications as well. (Momentum, Kinetic energy, and Force)
Determinants of capital structure of commercial banks in Ethiopia
Creators: name: Ahmed, Melkie
Publisher: name: National Academic Digital Repository of Ethiopia
Year: 2017

description: Capital structure decision is one of the core decisions that financial managers should care for. Different firms have different choice of funds that are categorized under either debt or equity. But the most important question is what factors determine their choice of finance and how they affect it. In order to give answer for such question, this study examined the effect of firm specific & macroeconomic factors of capital structure on the dependent variable as measured by total debt ratio. It also investigates the theories of capital structure that can best explain the capital structure of private commercial banks in Ethiopia. In order to achieve this objective the researcher fully relied on secondary sources of data such as financial reports of private banks and reports of National Bank of Ethiopia and regressed firm specific factors (profitability, tangibility and age) and macroeconomic factors (GDP growth rate and interest rate) against the dependent variable leverage. The researcher utilized quantitative approach and regressed thirteen years (2004 – 2016) data for six private commercial banks in Ethiopia. The results of this study suggested that profitability, GDP growth rate and interest rate variables were found to be significant factors affecting leverage of commercial banks in Ethiopia confirming tradeoff and pecking order theories as prominent theories for the sector. On the other hand, tangibility and age variables were found as insignificant to affect the dependent variable. Thus, Ethiopian commercial banks' managers are advised to have closer attention on profitability, GDP growth rate and interest rate factors in order to make optimal decision pertaining to capital structure.
acceleration Derivative Notation (ADN)
Creators: name: Basson, Keanu
Publisher: name: figshare
Year: 2024
Subjects: classificationCode: 510399
subject: Classical physics not elsewhere classified

description: This paper attempts to explain the use of the acceleration derivative notation as well as it's rules and methods of use. The ADN is a technique that can be used for calculating vector magnitudes that are lost 1 second post deceleration. The main focus being velocity, but there are many other applications as well. (Momentum, Kinetic energy, and Force)
Controlled Electrode Magnetization Alignment in Planar Elliptical Ferromagnetic Break Junction Devices
Creators: name: Scott, Gavin D.
name: Hu, Ting-Chen
Publisher: name: arXiv
Year: 2016
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Controlling the magnetization reversal process of magnetic elements is important for a wide range of applications that make use of magnetoresistive effects, but is difficult to achieve for devices that require adjacent thin film structures capable of contacting an individual molecule or quantum dot. We report on the fabrication and measurement of ferromagnetic break junction devices with planar, elliptical leads to address the particular challenge of controlling the relative magnetization alignment between neighboring electrodes. Low temperature transport measurements, supported by finite-element micromagnetic simulations, are used to characterize the magnetoresistance response across a range of conductance levels. We demonstrate that an in-plane external field applied parallel to the hard axis of the ellipses may be used to controllably switch the magnetization of the source and drain electrodes between monodomain-like parallel and antiparallel configurations for devices in the tunneling regime.
description: 6 pages, 6 figures
Vortex motion and flux-flow resistivity in dirty multiband superconductors
Creators: name: Silaev, Mihail
name: Vargunin, Artjom
Publisher: name: arXiv
Year: 2016
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: The conductivity of vortex lattices in multiband superconductors with high concentration of impurities is calculated based on microscopic kinetic theory. Both the limits of high and low fields are considered, when the magnetic induction is close to or much smaller than the critical field strength $H_{c2}$, respectively. It is shown that in contrast to single-band superconductors the resistive properties are not universal but depend on the pairing constants and ratios of diffusivities in different bands. The low-field magneto-resistance can strongly exceed Bardeen-Stephen estimation in a quantitative agreement with experimental data for two-band superconductor MgB$_2$.
CARMA Large Area Star Formation Survey: Dense Gas in the Young L1451 Region of Perseus
Creators: name: Storm, Shaye
name: Mundy, Lee G.
name: Lee, Katherine I.
name: Fernández-López, Manuel
name: Looney, Leslie W.
name: Teuben, Peter
name: Arce, Héctor G.
name: Rosolowsky, Erik W.
name: Meisner, Aaron M.
name: Isella, Andrea
name: Kauffmann, Jens
name: Shirley, Yancy L.
name: Kwon, Woojin
name: Plunkett, Adele L.
name: Pound, Marc W.
name: Segura-Cox, Dominique M.
name: Tassis, Konstantinos
name: Tobin, John J.
name: Volgenau, Nikolaus H.
name: Crutcher, Richard M.
name: Testi, Leonardo
Publisher: name: arXiv
Year: 2016
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present a 3 mm spectral line and continuum survey of L1451 in the Perseus Molecular Cloud. These observations are from the CARMA Large Area Star Formation Survey (CLASSy), which also imaged Barnard 1, NGC 1333, Serpens Main and Serpens South. L1451 is the survey region with the lowest level of star formation activity---it contains no confirmed protostars. HCO+, HCN, and N2H+ (J=1-0) are all detected throughout the region, with HCO+ the most spatially widespread, and molecular emission seen toward 90% of the area above N(H_2) column densities of 1.9x10^21 cm^-2. HCO+ has the broadest velocity dispersion, near 0.3 km/s on average, compared to ~0.15 km/s for the other molecules, thus representing a range from supersonic to subsonic gas motions. Our non-binary dendrogram analysis reveals that the dense gas traced by each molecule has similar hierarchical structure, and that gas surrounding the candidate first hydrostatic core (FHSC), L1451-mm, and other previously detected single-dish continuum clumps have similar hierarchical structure; this suggests that different sub-regions of L1451 are fragmenting on the pathway to forming young stars. We determined the three-dimensional morphology of the largest detectable dense gas structures to be relatively ellipsoidal compared to other CLASSy regions, which appeared more flattened at largest scales. A virial analysis shows the most centrally condensed dust structures are likely unstable against collapse. Additionally, we identify a new spherical, centrally condensed N2H+ feature that could be a new FHSC candidate. The overall results suggest L1451 is a young region starting to form its generation of stars within turbulent, hierarchical structures.
description: Accepted to The Astrophysical Journal (ApJ), 45 pages, 24 figures (some with reduced resolution in this preprint); Project website is at http://carma.astro.umd.edu/classy
Parameters Object Generator (POG) : version 1.2
Creators: name: Mizrachi, Yossi.
Publisher: name: Monash University
Year: 2022

description: This thesis was scanned from the print manuscript for digital preservation and is copyright the author.
 Researchers can access this thesis by asking their local university, institution or public library to
 make a request on their behalf. Monash staff and postgraduate students can use the link in the References field.
Calculating algebraic entropies: an express method
Creators: name: Ramani, Alfred
name: Grammaticos, Basil
name: Willox, Ralph
name: Mase, Takafumi
Publisher: name: arXiv
Year: 2016
Subjects: subject: Mathematical Physics (math-ph)
subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: FOS: Physical sciences

description: We describe a method for investigating the integrable character of a given three-point mapping, provided that the mapping has confined singularities. Our method, dubbed "express", is inspired by a novel approach recently proposed by R.G. Halburd. While the latter aims at computing the exact degree growth of a given mapping based on the structure of its singularities, we content ourselves with obtaining an answer as to whether a given system is integrable or not. We present several examples illustrating our method as well as its limitations. We also compare the present method to the full-deautonomisation approach we recently introduced.
description: 11 pages, no figures ; eq. (21) corrected
The Effects of Foreign Direct Investment and International Trade on Ethiopian Economic Growth
Creators: name: Surafel, Getachew
Publisher: name: National Academic Digital Repository of Ethiopia
Year: 2019

description: Foreign direct investment and international trade are considered as essential factors in achieving sustainable economic growth. Most theories are in support of their positive influence on the economic growth of countries. However, empirical studies in this area have presented mixed findings. In the case of Ethiopia, limited number of studies have been conducted on the individual variables' effects on economic growth. Thus, their findings are mostly mixed and inconclusive. In this regard, this study has been conducted with the aim of examining the effects of FDI and international trade on Ethiopian economic growth over the period 1992 to 2017. The autoregressive distributive lag model was employed to analyze the annual secondary data among the variables: real GDP growth, FDI, export, import, remittance, external debt and tax revenue. According to the results, FDI's effect was positive but insignificant both in the short and long run. Exports have a positive and significant effect both in the short and long run. Imports have a negative effect both in the short and long run but are significant only in the long run. Remittance has a positive effect both in the short and long run but significant only in the long run. External debt has a negative and significant effect both in the long and short run. Tax revenue has a positive and significant effect both in the short and long run. Hence, from the findings, the Ethiopian government needs to carefully scrutinize its policies regarding FDI as its effect on economic growth is positive but insignificant. Exports are useful for economic growth of Ethiopia, hence, policies encouraging exports have to be put in place. However, policies towards import need to be controlling as the rise in imports is resulting in the widening of trade deficit.
@acceleration Derivative Notation (ADN)
Creators: name: Basson, Keanu
Publisher: name: figshare
Year: 2024
Subjects: classificationCode: 510399
subject: Classical physics not elsewhere classified

description: This paper attempts to explain the use of the acceleration derivative notation as well as it's rules and methods of use. The ADN is a technique that can be used for calculating vector magnitudes that are lost 1 second post deceleration. The main focus being velocity, but there are many other applications as well. (Momentum, Kinetic energy, and Force)
The JCMT Gould Belt Survey: A First Look at Southern Orion A with SCUBA-2
Creators: name: Mairs, Steve
name: Johnstone, D.
name: Kirk, H.
name: Buckle, J.
name: Berry, D. S.
name: Broekhoven-Fiene, H.
name: Currie, M. J.
name: Fich, M.
name: Graves, S.
name: Hatchell, J.
name: Jenness, T.
name: Mottram, J. C.
name: Nutter, D.
name: Pattle, K.
name: Pineda, J. E.
name: Salji, C.
name: Di Francesco, J.
name: Hogerheijde, M. R.
name: Ward-Thompson, D.
name: Bastien, P.
name: Bresnahan, D.
name: Butner, H.
name: Chen, M.
name: Chrysostomou, A.
name: Coudé, S.
name: Davis, C. J.
name: Drabek-Maunder, E.
name: Duarte-Cabral, A.
name: Fiege, J.
name: Friberg, P.
name: Friesen, R.
name: Fuller, G. A.
name: Greaves, J.
name: Gregson, J.
name: Holland, W.
name: Joncas, G.
name: Kirk, J. M.
name: Knee, L. B. G.
name: Marsh, K.
name: Matthews, B. C.
name: Moriarty-Schieven, G.
name: Mowat, C.
name: Rawlings, J.
name: Richer, J.
name: Robertson, D.
name: Rosolowsky, E.
name: Rumble, D.
name: Sadavoy, S.
name: Thomas, H.
name: Tothill, N.
name: Viti, S.
name: White, G. J.
name: Wouterloot, J.
name: Yates, J.
name: Zhu, M.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present the JCMT Gould Belt Survey's first look results of the southern extent of the Orion A Molecular Cloud ($δ\leq -5\mathrm{:}31\mathrm{:}27.5$). Employing a two-step structure identification process, we construct individual catalogues for large-scale regions of significant emission labelled as islands and smaller-scale subregions called fragments using the 850 $μ$m continuum maps obtained using SCUBA-2. We calculate object masses, sizes, column densities, and concentrations. We discuss fragmentation in terms of a Jeans instability analysis and highlight interesting structures as candidates for follow-up studies. Furthermore, we associate the detected emission with young stellar objects (YSOs) identified by Spitzer and Herschel. We find that although the population of active star-forming regions contains a wide variety of sizes and morphologies, there is a strong positive correlation between the concentration of an emission region and its calculated Jeans instability. There are, however, a number of highly unstable subregions in dense areas of the map that show no evidence of star formation. We find that only $\sim$72\% of the YSOs defined as Class 0+I and flat-spectrum protostars coincide with dense 850 $μ$m emission structures (column densities $>3.7\times10^{21}\mathrm{\:cm}^{-2}$). The remaining 28\% of these objects, which are expected to be embedded in dust and gas, may be misclassified. Finally, we suggest that there is an evolution in the velocity dispersion of young stellar objects such that sources which are more evolved are associated with higher velocities.
description: 31 Pages, 19 Figures, Accepted for publication in Monthly Notices of the Royal Astronomical Society (MNRAS)
Learning Points and Routes to Recommend Trajectories
Creators: name: Chen, Dawei
name: Ong, Cheng Soon
name: Xie, Lexing
Publisher: name: arXiv
Year: 2016
Subjects: subject: Machine Learning (cs.LG)
subject: Information Retrieval (cs.IR)
subject: FOS: Computer and information sciences

description: The problem of recommending tours to travellers is an important and broadly studied area. Suggested solutions include various approaches of points-of-interest (POI) recommendation and route planning. We consider the task of recommending a sequence of POIs, that simultaneously uses information about POIs and routes. Our approach unifies the treatment of various sources of information by representing them as features in machine learning algorithms, enabling us to learn from past behaviour. Information about POIs are used to learn a POI ranking model that accounts for the start and end points of tours. Data about previous trajectories are used for learning transition patterns between POIs that enable us to recommend probable routes. In addition, a probabilistic model is proposed to combine the results of POI ranking and the POI to POI transitions. We propose a new F$_1$ score on pairs of POIs that capture the order of visits. Empirical results show that our approach improves on recent methods, and demonstrate that combining points and routes enables better trajectory recommendations.
Value Chain Analysis for Bamboo Originating from Shedem Kebele, Bale Zone
Creators: name: Andargatchew, Arsema
Publisher: name: National Academic Digital Repository of Ethiopia
Year: 2008

description: Bamboo is a highly utilised natural resource in many parts of the world. In Ethiopia, despite the availability of vast bamboo forests, the use is mainly limited to construction, fences, some rudimentary furniture and household utensils. Except for some general publications on value chain of bamboo in Ethiopia, there isn't much detailed work that will enable intervention at specific sites. Therefore, to understand the existing value chain and harness the bamboo potential as a means of alternative livelihoods through a well developed marketing strategy, the value chain analysis was carried out for Shedem Kebele, in Bale Zone. The results show that communities in Shedem as well as the surrounding towns depend on bamboo resources highly. On average 47% of the annual income is estimated to be derived from bamboo sale for Shedem farmers. Further 17,000 – 23,000 bamboo culms are consumed on each market day in the Goba market. However, the bamboo culms are mainly used for construction and very little of furniture and crafts that are available do not satisfy the quality requirement of even the local community. The value chain studied was found to be very week with little or no communication among actors. Therefore, in order to efficiently use the available resource, it is essential to have a stronger and well coordinated value chain. For this to happen trainings at all level of the chain, organisation of farmers into groups, close collaboration with the private sector, proper management of bamboo forests and plantations and advocacy and marketing are required. Further, actors such as governmental and nongovernmental organisations should focus on development of the appropriate policy, research for value addition and establishment of information resource center.
Nanostructures mechanically stable with desirable characteristic field enhancement factor: a response from scale invariance in electrostatics
Creators: name: de Assis, Thiago A.
name: Dall'Agnol, Fernando F.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: This work presents an accurate numerical study of the electrostatics of systems formed by individual nanostructure mounted on support substrate tip, a theoretical prototype for applications in field electron emission or for construction of tips in probe microscopy requiring high resolution. We modeled substrate tip with height $h_1$, radius $r_{1}$ and characteristic field enhancement factor (FEF) $γ_1$, and the top nanostructure with height $h_2$, radius $r_{2}
Extensible markup language (XML) for internet electronic data interchange (EDI)
Creators: name: Pratama, Otniel.
Publisher: name: Monash University
Year: 2022

description: This thesis was scanned from the print manuscript for digital preservation and is copyright the author.
 Researchers can access this thesis by asking their local university, institution or public library to
 make a request on their behalf. Monash staff and postgraduate students can use the link in the References field.
Anisotropic expansion of a thermal dipolar Bose gas
Creators: name: Tang, Yijun
name: Sykes, Andrew G.
name: Burdick, Nathaniel Q.
name: DiSciacca, Jack M.
name: Petrov, Dmitry S.
name: Lev, Benjamin L.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: Atomic Physics (physics.atom-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We report on the anisotropic expansion of ultracold bosonic dysprosium gases at temperatures above quantum degeneracy and develop a quantitative theory to describe this behavior. The theory expresses the post-expansion aspect ratio in terms of temperature and microscopic collisional properties by incorporating Hartree-Fock mean-field interactions, hydrodynamic effects, and Bose-enhancement factors. Our results extend the utility of expansion imaging by providing accurate thermometry for dipolar thermal Bose gases, reducing error in expansion thermometry from tens of percent to only a few percent. Furthermore, we present a simple method to determine scattering lengths in dipolar gases, including near a Feshbach resonance, through observation of thermal gas expansion.
description: main text and supplement, 11 pages total, 4 figures
Determinants of Capital Structure of Insurance Companies in Ethiopia
Creators: name: Beshir, Daniel
Publisher: name: National Academic Digital Repository of Ethiopia
Year: 2015

description: The impact of firm characteristics on the capital structure of the insurance industry is considered to be an important issue in a current business world of solid competition we are living. This study empirically examines the determinants of capital structure of insurance companies in Ethiopia. The study attempt to highlight the critical firm characteristics that managers should consider when setting their "optimal" capital structure. The study employed panel regression model in examining the capital structure of insurance companies in Ethiopia with financial statements of eight insurance companies covering the period of ten consecutive years, 2005-2014. The study used panel data techniques specifically Fixed Effect (FE) robust standard error regressions analyzed using STATA. To purposefully forward conclusion, normality, multicollinearity, heteroscedastcity, autocorrelation and robustness tests were conducted on the data. The results show that pecking order, the static trade-off and agency cost theories are important in explaining the capital structure of insurance companies in Ethiopia, even if the Pecking order theory appears to be dominant. Profitability, asset tangibility, growth and liquidity were found to be significant in relation to leverage. The negative relationship between profitability and leverage is an indication that profitable insurance companies prefer internal sources of finance to external sources, hence less debt in their capital structure. The negative relationship between asset tangibility and leverage is an indication that companies with smaller share of tangible assets tend to be more subject to information asymmetries. It is because intangible assets are more difficult to price and hence the cost of debt increases. The other significant determinant variable, growth opportunity of the firm, had a positive relationship with debt ratio proving that insurance companies depend more on debt to finance their growth. However, liquidity found to be negatively associated with leverage and indicated that Ethiopian Insurance firms with liquid assets will prefer internal sources than debt to finance future investments. The other hypothesized firm level variables, business risk and size of the firm were insignificant.
Product Roadmapping Challenges - Further Articles
Creators: name: Trieflinger, Stefan
name: Münch, Jürgen
name: Lang, Dominic
Publisher: name: figshare
Year: 2022
Subjects: subject: 80309 Software Engineering
subject: FOS: Computer and information sciences

description: Context: Companies that operate in the software-intensive business are confronted with high market dynamics, rapidly evolving technologies as well as fast-changing customer behavior. Traditional product roadmapping practices, such as fixed-time-based charts including detailed planned features, products, or services, typically fail in such environments Until now the underlying reasons for the failure of product roadmaps in a dynamic and uncertain market environment are not been widely analyzed and understood. Objective: This paper aims to identify current challenges and pitfalls practitioners face when developing and handling product roadmaps in a dynamic and uncertain market environment. Method: In order to reach our objective we conducted a grey literature review (GLR). Results: Overall we identified 40 relevant papers, from which we could extract 11 challenges of the application of product roadmapping in a dynamic and uncertain market environment. The analysis of the articles showed that the major challenges for practitioners originate from overcoming a feature-driven mindset, not including a lot of details in the product roadmap as well as ensuring that the content of the roadmap is not determined on the opinions of management or experts. The results of our study can be used to derive requirements for the development of approaches for a successful product roadmapping in a dynamic and uncertain market environment.
Optimization of mechanical properties of multiscale hybrid polymer nanocomposites: A combination of experimental and machine learning techniques
Creators: name: Diez Pascual, Ana Maria
name: Champa Bujaico, Elizabeth
name: Lomas Redondo, Alba
name: Garcia Diaz, Pilar
Publisher: name: figshare
Year: 2024
Subjects: classificationCode: 460207
subject: Modelling and simulation
classificationCode: 461104
subject: Neural networks
classificationCode: 461199
subject: Machine learning not elsewhere classified
classificationCode: 340799
subject: Theoretical and computational chemistry not elsewhere classified

description: The mechanical properties of multiscale poly(3-hydroxybutyrate) (P3HB)-based nanocomposites reinforced with different concentrations of multiwalled carbon nanotubes (MWCNTs), WS2 nanosheets and sepiolite (SEP) nanoclay have been predicted via Machine Learning (ML) models. The nanocomposites were prepared via solution casting. SEM images revealed that the three nanofillers were homogenously and randomly dispersed into the matrix. A synergistic reinforcement effect was attained, resulting in an unprecedented stiffness improvement of 132% upon addition of 1:2:2 wt% SEP:MWCNTs:WS2. Conversely, the increments in strength were only moderates (up to 13.4%). A beneficial effect in the matrix ductility was also found due to the presence of both nanofillers. Four ML approaches, Recurrent Neural Network (RNN), RNN with Levenberg’s algorithm (RNN-LV), decision tree (DT) and Random Forest (RF), were applied. The correlation coefficient (R2), mean absolute error (MAE) and mean square error (MSE) were used as statistical indicators to compare their performance. The best performing model for the Young’s modulus, elongation at break and impact strength was RNN, while for the tensile strength was the RF model. The highest correlation (R2 of 1 and 0.9203 for the training and test set, respectively) and the smallest errors (MSE of 0.13 and MAE of 0.31) were obtained for the prediction of the elongation at break. The developed models represent a powerful tool for the optimization of the mechanical properties in multiscale hybrid polymer nanocomposites, saving time and resources.