cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Modulation of circular current and associated magnetic field in a molecular junction: A new approach
Creators: name: Patra, Moumita
name: Maiti, Santanu K.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: A new proposal is given to control local magnetic field in a molecular junction. In presence of finite bias a net circular current is established in the molecular ring which induces a magnetic field at its centre. Allowing a direct coupling between two electrodes, due to their close proximity, and changing its strength we can regulate circular current as well as magnetic field for a wide range, without disturbing any other physical parameters. We strongly believe that our proposal is quite robust compared to existing approaches of controlling local magnetic field and can be verified experimentally.
description: 9 pages, 8 figures (Accepted for Publication in Scientific Reports)
The Effect of Internal Marketing on Organizational Commitment: The case of Zemen Bank
Creators: name: Nakachew, Tegbar
Publisher: name: National Academic Digital Repository of Ethiopia
Year: 2018

description: The objective of this study was to determine the effect of internal marketing on organizational commitment in the case of Zemen Bank. The population of interest in this study was employees of Zemen bank operating in Addis Ababa head office and main branch. Five dimensions of internal marketing namely: inter functional coordination, training, understanding and differentiation, integration and motivation and job satisfaction was the independent variables, on the other hand organizational commitment (Affective commitment, Continuance commitment and Normative commitment) was the dependent variable. The study employed a survey (structured questionnaire) with a five likert scale, 212 employees were sampled from which 187 respondents returned fully completed questionnaires (87% response rate). A quantitative study with explanatory research design, Simple random sampling specifically lottery method was used; SPSS 20 was used to analyze descriptive statistics to show the demographic characteristics of the respondents and inferential statistics (multiple regression and multiple correlation) to show the effect of each dimension on organizational commitment and to show their relationship as well. Data analysis indicated that understanding & differentiation and job satisfaction have positive and statistical significant effects on the organizational commitment of employees in Zemen banks. Therefore if the bank desires to ultimately provide a better service experience for their employees, it is recommended that more attention should be directed toward enhancing organizational commitment among personnel by focusing on these two internal marketing dimensions (job satisfaction and understanding & differentiation).
Systems of semilinear parabolic variational inequalities with time-dependent convex obstacles
Creators: name: Klimsiak, Tomasz
name: Rozkosz, Andrzej
name: Slominski, Leszek
Publisher: name: arXiv
Year: 2016
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics
subject: 35K87 (Primary), 60H30 (Secondary)

description: We consider a system of seminlinear parabolic variational inequalities with time-dependent convex obstacles. We prove the existence and uniqueness of its solution. We also provide a stochastic representation of the solution and show that it can be approximated by the penalization method. Our proofs are based upon probabilistic methods from the theory of Markov processes and the theory of backward stochastic differential equations.
On the cancellation of Newtonian singularities in higher-derivative gravity
Creators: name: Giacchini, Breno L.
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Recently there has been a growing interest in quantum gravity theories with more than four derivatives, including both their quantum and classical aspects. In this work we extend the recent results concerning the non-singularity of the modified Newtonian potential to the most relevant case in which the propagator has complex poles. The model we consider is Einstein-Hilbert action augmented by curvature-squared higher-derivative terms which contain polynomials on the d'Alembert operator. We show that the classical potential of these theories is a real quantity and it is regular at the origin disregard the (complex or real) nature or the multiplicity of the massive poles. The expression for the potential is explicitly derived for some interesting particular cases. Finally, the issue of the mechanism behind the cancellation of the singularity is discussed; specifically we argue that the regularity of the potential can hold even if the number of massive tensor modes and scalar ones is not the same.
description: 17 pages, 1 figure. References added, typos corrected, some parts rewritten. Accepted for publication in Phys. Lett. B
Determinants of Commercial Banks Profitability: -An Empirical evidence from the Commercial Banks of Ethiopia
Creators: name: Tsehay, Birhanu
Publisher: name: National Academic Digital Repository of Ethiopia
Year: 2012

description: The main objective of this study is to examine the effect of bank-specific, industry-specific and macroeconomic determinants of Ethiopian commercial banking industry profitability from the period 2000 – 2011. By usig OLS etimation method to measure the effect of internal and external determinants on profitability interms of average return on asset and net interest margin. The estimation results show that profitability persists in some extent, implies that the indicator of the existance of relatively fairly competitive market in Ethiopian commercial banking environment, especially competition between private banks. Regarging the explanatory variables, all bank-specific determinants, with the exception of bank size, expense management and credit risk, affect bank profitability significantly and positively in the anticipated way. However, bank size, expense management and credit risk affect the commercial banks profitability significantly and negatively. In addition to this, no evidence is found in support of the presence of market concentration. Finally, from macro economic determinants GDP has positive and significant effect on both asset return and interest margin of the bank. But interest rate policy has significant and positive effect only on interest margin. The commercial banks of Ethiopia policy makers and managers should give high concern to the credit risk management, expense management and large bank size management inorder to reduce the hindrance of the profitability of the banks.
Exceptional Quantum Walk Search on the Cycle
Creators: name: Wong, Thomas G.
name: Santos, Raqueline A. M.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Quantum walks are standard tools for searching graphs for marked vertices, and they often yield quadratic speedups over a classical random walk's hitting time. In some exceptional cases, however, the system only evolves by sign flips, staying in a uniform probability distribution for all time. We prove that the one-dimensional periodic lattice or cycle with any arrangement of marked vertices is such an exceptional configuration. Using this discovery, we construct a search problem where the quantum walk's random sampling yields an arbitrary speedup in query complexity over the classical random walk's hitting time. In this context, however, the mixing time to prepare the initial uniform state is a more suitable comparison than the hitting time, and then the speedup is roughly quadratic.
description: 16 pages, 7 figures
Audit de pratique en hygiène environnementale : la fluorescéine au service de la performance du bionettoyage
Creators: name: Hoarau, Mélanie
name: Lamouroux, Fabien
Publisher: name: Health & Co
Year: 2023
Subjects: Infection associée aux soins
Environnement
Bionettoyage
Évaluation des pratiques professionnelles
Action de formation

description: En 2021, le centre hospitalier de Cholet a connu deux épidémies majeures qui ont amené l’équipe opérationnelle d’hygiène (EOH) à engager une réflexion autour du bionettoyage des chambres. En effet, l’investigation a pu mettre en évidence la forte probabilité d’une transmission croisée en lien avec l’environnement. Afin d’évaluer la qualité du bionettoyage, un gel de fluorescéine a été apposé sur différents objets dits « critiques » avant que l’entretien des chambres ne soit réalisé (poignées de porte, interrupteurs, télécommande de lit, appel malade, interphone, barrières de lit, robinetterie, main courante, chasse d’eau, lunette des toilettes…). Un contrôle a posteriori, à l’aide d’une lampe à lumière noire, a permis de vérifier si les marquages de gel fluorescent étaient toujours présents ou non. Au total, 64 chambres et plus de 1 000 cibles ont été évaluées dans 8 services des 5 pôles de l’établissement. Le taux global de conformité du bionettoyage de la première phase de l’audit était de 53,8%. L’utilisation du gel de fluorescéine au sein d’un programme de surveillance de l’environnement a permis d’améliorer le niveau de compétence des professionnels pour atteindre un taux de conformité de 77,4% à l’occasion d’un second audit, soit une augmentation significative de 23,6%. L’outil et la méthode ont été assez bien perçus par les professionnels concernés et très appréciés des cadres de santé, qui y ont trouvé une bonne plus-value. Les résultats de cette expérience sont le fruit d’une collaboration entre les équipes et l’EOH. Les temps d’évaluation, d’information, de sensibilisation et de formation sont autant d’éléments propices à la mise en œuvre d’une politique de sécurité et de qualité des soins.
The Effectiveness of Development-Oriented Non-Reciprocal Trade Preferences in Promoting Agricultural Trade
Creators: name: Ridley, William
name: Shirin, Farzana
name: Ridley, William
name: Shirin, Farzana
Publisher: name: Unknown
Year: 2023
Subjects: subject: Agricultural and Food Policy
subject: International Relations/Trade
subject: Non-reciprocal trade preferences
subject: Generalized System of Preferences
subject: Agricultural trade
subject: Gravity

description: Evidence on the efficacy of development-oriented non-reciprocal trade preferences (NRTPs) in promoting the exports of agricultural and food products from preference beneficiaries to preference donors has been mixed. We investigate the impacts of NRTPs on such trade in a structural gravity setting at a highly disaggregated product level. To this end, we compile a detailed dataset on bilateral trade and tariffs for 23 individual agricultural commodities prominent in developing countries’ export baskets, which together accounted for roughly $519 billion of trade as of 2018. Based on estimates from our commodity-level structural gravity model, we utilize the structural foundation of the gravity framework to quantify the trade impacts of such preference schemes in a counterfactual simulation analysis. The results of this analysis show that NRTPs were responsible for around $1.4 billion in expanded exports from NRTP beneficiary countries to donor countries as of 2018, with significant heterogeneity in the countries and commodities that undergo the largest impacts.
Deciphering the Biochemistry of Acetaldehyde using Small Molecule Tools: From Hangovers to Cancer
Creators: name: A. Thomas, Liam
Publisher: name: University of Leicester
Year: 2025

description: Acetaldehyde (AcH) is a highly reactive and volatile electrophile with wide ranging effects on biology. AcH is formed as the first metabolite of ethanol and is proposed to be the cause of alcohol-induced genotoxicity. AcH has further been implicated in an array of physiological responses to alcohol consumption, including memory loss, loss of motor control, and ‘hangovers’. Studying AcH in biologically relevant conditions has proven difficult due to its rapid reactivity and high volatility. To assist in studying AcH-relevant biochemistry, chemical tools are required. This work outlines the development of phthalimide- and benzotriazole-based AcH-(and other aldehyde) releasing prodrugs to enable accurate dosing of AcH in cells. The release kinetics and stability of the tools were characterised by NMR before their toxicity was profiled within a model liver cancer cell line (HepG2). The tool compounds exhibit comparable toxicity (or in some cases greater toxicity) than the respective aldehyde. Alongside AcH releasers, classical chemistry methods are explored for scavenging and quantifying AcH. Techniques such as the Friedlander annulation and 3-aza-Cope rearrangement are investigated, and their limitations are outlined. The fundamental reactivity and biochemistry of AcH and biomolecules is also explored. Proline amide (and other amino acid amides) act as aldol catalysts, leading to the production of the AcH self-aldol product crotonaldehyde. Histone H2A/H2B dimer, previously thought to be non-catalytic, is also shown to enhance self-aldol condensation reactions. Tetrahydrofolate, a natural scavenger of formaldehyde, is also shown to react with AcH and propionaldehyde. Overall, this work has developed a new chemical toolkit to study AcH biology and provides insight into the fundamental chemistry undertaken by AcH under physiologically relevant conditions.
Topological spaces with an $ω^ω$-base
Creators: name: Banakh, Taras
Publisher: name: arXiv
Year: 2016
Subjects: subject: General Topology (math.GN)
subject: Logic (math.LO)
subject: FOS: Mathematics
subject: 54D70, 54E15, 54E18, 54E35 (Primary), 03E04, 03E17, 54A20, 54A25, 54A35, 54C35, 54D15, 54D45, 54D65, 54G10, 54G20 (Secondary)

description: Given a partially ordered set $P$ we study properties of topological spaces $X$ admitting a $P$-base, i.e., an indexed family $(U_α)_{α\in P}$ of subsets of $X\times X$ such that $U_β\subset U_α$ for all $α\leβ$ in $P$ and for every $x\in X$ the family $(U_α[x])_{α\in P}$ of balls $U_α[x]=\{y\in X:(x,y)\in U_α\}$ is a neighborhood base at $x$. A $P$-base $(U_α)_{α\in P}$ for $X$ is called locally uniform if the family of entourages $(U_αU_α^{-1}U_α)_{α\in P}$ remains a $P$-base for $X$. A topological space is first-countable if and only if it has an $ω$-base. By Moore's Metrization Theorem, a topological space is metrizable if and only if it is a $T_0$-space with a locally uniform $ω$-base. In the paper we shall study topological spaces possessing a (locally uniform) $ω^ω$-base. Our results show that spaces with an $ω^ω$-base share some common properties with first countable spaces, in particular, many known upper bounds on the cardinality of first-countable spaces remain true for countably tight $ω^ω$-based topological spaces. On the other hand, topological spaces with a locally uniform $ω^ω$-base have many properties, typical for generalized metric spaces. Also we study Tychonoff spaces whose universal (pre- or quasi-) uniformity has an $ω^ω$-base and show that such spaces are close to being $σ$-compact.
description: 105 pages
Optimized power grid operations for negative pricing using collective intelligence
Creators: name: Uma, Perumal
Publisher: name: Zenodo
Year: 2024

description: Electricity pricing in the market has been going negative in recent days due to lower demand or Net Demand Variability (NDV) in the instances of surplus supply due to variable additional sources in the market. The WG (Working Group) analysis reflects the same as fossil fuels like coal/gas are relieved by renewable energy like wind/solar. Negative pricing (NP) is a market-based methodology to administrate excess supply to electric grid as this excess supply imbalances the supply/demand curve.NP is predominant in western countries like Europe, Americas & Australia. But it is getting more common these days in Indian grid. Mere cutting off the source may help the administration manage the situation, but NP, if used with a Collective Intelligence (CI) can help both suppliers, users & the overall economy of the nation. Here CI refers to the data interaction among suppliers, users & power grid administrators with the aid of AI. CI here helps industries consuming power to get prepared in advance to use the available power or subsidized power to keep up the demand and avoid the grid operation in NP regime. The way of dealing with NP & utilizing a catastrophe as an opportunity is discussed in this paper.

 

CI has been implemented in many countries among various electricity suppliers, but not among the various users of industry. Observed energy savings ranging from 10~30% ($220~$1.7 billion) has been experienced by various countries. If CI is extended among these industrial stakeholders with effective planning and implementation mentioned in this article, the % savings could even exceed above 30% in energy and $1.7 billion.
Application of Good Governance Principles for Urban Land Development and Management in Addis Ababa City Administration: the Practices and Challenges in Yeka Sub-City.
Creators: name: Melese, Nigussie
Publisher: name: National Academic Digital Repository of Ethiopia
Year: 2016

description: This research is aimed at assessing land development and management practices and challenges in Yeka Sub-City administration. The study assessed the problem by applying good governance principles under the five good governance dimensions. In order to achieve the above mentioned objectives, literature review was undertaken that includes previous studies, various land management books and manuals. Thus with this literature review a conceptual framework was developed and a feasible methodology has evolved. Questionnaires, interview and document review checklists were used as research tools to collect data. The qualitative data was analyzed using narrative explanation. The findings of the study revealed that land development and management processes are not transparent to the service users. Weak citizen participation in the land development and management and unequal treatment of clients in the service provision were observed as key problems. The study also revealed that service users were dissatisfied on the performance of land development and management officials in their service delivery for different needs. Finally, based on the findings of the study, recommendations were forwarded. Key Concepts: Land development, land management, good governance principle
BEYOND THE SURFACE: INVESTIGATING CLAY AND GOETHITE FOR LEAD DECONTAMINATION IN AQUEOUS SOLUTIONS
Creators: name: Chukwudi, Okechukwu Ezeani
name: Funmilayo, Adeola Abiodun
name: Ibrahim, Tunde Ajayi
Publisher: name: SADI journals
Year: 2024
Subjects: Heavy Metal Pollution
Sewage Treatment
Lead Contamination
Environmental Health

description: The imperative to mitigate environmental pollution underscores the necessity to eliminate heavy metal ions from sewage before their release into the ecosystem (Bystrzejewski and Pyrzyn, 2011). The unchecked discharge of heavy metal-laden effluents into water bodies poses a severe threat to the ecosystem, triggering pollution and potential hazards (García-Lorenzo et al., 2010). Non-biodegradable in nature, heavy metals have a propensity to accumulate in living organisms, inducing a spectrum of life-threatening disorders (Bystrzejewski and Pyrzyn, 2011). This persistence in the environment and bioaccumulation throughout the food chain distinguish metals from other toxic pollutants (Maleki et al., 2011).

Lead, a prominent pollutant in industrial effluents, emanates from diverse sectors including electroplating, electrical and electronic industries, hydrometallurgical processing, ore beneficiation, and tanneries (Randhawa et al., 2012; Terminghoff et al., 1994). The discharge of lead and other heavy metals into water bodies presents a pressing environmental concern, necessitating immediate attention and intervention. This concern transcends geographical boundaries, making it a priority for both developed and developing countries alike.

This study addresses the critical need to reduce metal concentrations in effluents discharged into water bodies, focusing on lead as a major pollutant. By examining the sources and implications of lead contamination from various industrial activities, the research aims to contribute to the development of effective strategies for the reduction and elimination of heavy metal discharge. The findings of this study are expected to inform policy frameworks and regulatory measures for safeguarding water quality and ecosystem health.
SDO/HMI survey of emerging active regions for helioseismology
Creators: name: Schunker, H.
name: Braun, D. C.
name: Birch, A. C.
name: Burston, R. B.
name: Gizon, L.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Observations from the Solar Dynamics Observatory (SDO) have the potential for allowing the helioseismic study of the formation of hundreds of active regions, which would enable us to perform statistical analyses. Our goal is to collate a uniform data set of emerging active regions observed by the SDO/HMI instrument suitable for helioseismic analysis up to seven days before emergence. We restricted the sample to active regions that were visible in the continuum and emerged into quiet Sun largely avoiding pre-existing magnetic regions. As a reference data set we paired a control region (CR), with the same latitude and distance from central meridian, with each emerging active region (EAR). We call this data set, which is currently comprised of 105 emerging active regions observed between May 2010 and November 2012, the SDO Helioseismic Emerging Active Region (SDO/HEAR) survey. To demonstrate the utility of a data set of a large number of emerging active regions, we measure the relative east-west velocity of the leading and trailing polarities from the line-of-sight magnetogram maps during the first day after emergence. The latitudinally averaged line-of-sight magnetic field of all the EARs shows that, on average, the leading (trailing) polarity moves in a prograde (retrograde) direction with a speed of 121 +/- 22 m/s (-70 +/- 13 m/s) relative to the Carrington rotation rate in the first day. However, relative to the differential rotation of the surface plasma, the east-west velocity is symmetric, with a mean of 95 +/- 13 m/s. The SDO/HEAR data set will not only be useful for helioseismic studies, but will also be useful to study other features such as the surface magnetic field evolution of a large sample of EARs.
description: Accepted by Astronomy and Astrophysics, 11 figures, one longtable; update corrects units in Figure 1
Kinetic turbulence in relativistic plasma: from thermal bath to non-thermal continuum
Creators: name: Zhdankin, Vladimir
name: Werner, Gregory R.
name: Uzdensky, Dmitri A.
name: Begelman, Mitchell C.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: We present results from particle-in-cell simulations of driven turbulence in magnetized, collisionless, and relativistic pair plasma. We find that fluctuations are consistent with the classical $k_\perp^{-5/3}$ magnetic energy spectrum at fluid scales and a steeper $k_\perp^{-4}$ spectrum at sub-Larmor scales, where $k_\perp$ is the wavevector perpendicular to the mean field. We demonstrate the development of a non-thermal, power-law particle energy distribution, $f(E) \sim E^{-α}$, with index $α$ that decreases with increasing magnetization and increases with increasing system size (relative to the characteristic Larmor radius). Our simulations indicate that turbulence can be a viable source of energetic particles in high-energy astrophysical systems, such as pulsar wind nebulae, if scalings asymptotically become insensitive to the system size.
description: 6 pages, 4 figures, to appear in PRL
Amtliche Mitteilungen der Universität Dortmund Nr. 13/79
Creators: name: (:Unkn) Unknown
Publisher: name: Universität Dortmund
Year: 1979
Subjects: subject: 080

description: Änderung der Promotionsordnung für die Fachrichtungen Chemie, Mathematik, Physik
description: Änderung der Promotionsordnung für die Fachrichtung Raumplanung
description: Änderung der Promotionsordnung für die Fachrichtung Statistik
description: Änderung der Promotionsordnung für die Fachrichtung Informatik
description: Bilanz und Gewinn- und Verlustrechnung des Studentenwerkes Dortmund AöR
description: Amtliche Mitteilungen der Universität Dortmund ; 13, 1979
Automated Helpdesk using Supervised Learning
Creators: name: Perumal, Uma
Publisher: name: Zenodo
Year: 2024

description: Automated helpdesk based on AI, that can understand the purpose of a query and answers by using supervised learning-based classification model generated out of customer documentation and troubleshooting guide, in aid to the customer service department. A classification model by crawling through the documentation, using test classification methodology, a technique that tags each page and classifies under a supervised learning model. Helpdesk identifies the intention of service request and sort them based on steps using general classification model
Optimal prediction for radiative transfer: A new perspective on moment closure
Creators: name: Frank, Martin
name: Seibold, Benjamin
Publisher: name: arXiv
Year: 2008
Subjects: subject: Mathematical Physics (math-ph)
subject: Numerical Analysis (math.NA)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences
subject: FOS: Mathematics
subject: 85A25, 78M05, 82Cxx

description: Moment methods are classical approaches that approximate the mesoscopic radiative transfer equation by a system of macroscopic moment equations. An expansion in the angular variables transforms the original equation into a system of infinitely many moments. The truncation of this infinite system is the moment closure problem. Many types of closures have been presented in the literature. In this note, we demonstrate that optimal prediction, an approach originally developed to approximate the mean solution of systems of nonlinear ordinary differential equations, can be used to derive moment closures. To that end, the formalism is generalized to systems of partial differential equations. Using Gaussian measures, existing linear closures can be re-derived, such as $P_N$, diffusion, and diffusion correction closures. This provides a new perspective on several approximations done in the process and gives rise to ideas for modifications to existing closures.
description: 15 pages; version 4: sections removed, major reformulations
Time dependence of Fe/O ratio within a 3D Solar Energetic Particle propagation model including drift
Creators: name: Dalla, S.
name: Marsh, M. S.
name: Zelina, P.
name: Laitinen, T.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Context. The intensity profiles of iron and oxygen in Solar Energetic Particle (SEP) events often display differences that result in a decreasing Fe/O ratio over time. The physical mechanisms behind this behaviour are not fully understood, but these observational signatures provide important tests of physical modelling efforts. Aims. In this paper we study the propagation of iron and oxygen SEP ions using a 3D model of propagation which includes the effect of guiding centre drift in a Parker spiral magnetic field. We derive time intensity profiles for a variety of observer locations and study the temporal evolution of the Fe/O ratio. Methods. We use a 3D full orbit test particle model which includes scattering. The configuration of the interplanetary magnetic field is a unipolar Parker spiral. Particles are released instantaneously from a compact region at 2 solar radii and allowed to propagate in 3D. Results. Both Fe and O experience significant transport across the magnetic field due to gradient and curvature drifts. We find that Fe ions drift more than O ions due to their larger mass-to-charge ratio, so that an observer that is not magnetically well connected to the source region will observe Fe arriving before O, for particles within the same range in energy per nucleon. As a result, for the majority of observer locations, the Fe/O ratio displays a decrease in time. Conclusions. We conclude that propagation effects associated with drifts produce a decay over time of the Fe/O ratio, qualitatively reproducing that observed in SEP event profiles.
description: Submitted to A&A, revised version (6 pages, 6 figures)
The Effects Of Sales Persons' Personality Traits On Organizations' Brand Image (The Case Of Ethio-Telecom)
Creators: name: Tefera, Yideneku
Publisher: name: National Academic Digital Repository of Ethiopia
Year: 2018

description: Sales persons' personality traits have a huge effect on organizations brand image (Magandini and Ngwenya, 2015). Literature review showed that there was no sufficient evidence to demonstrate the effect of personality traits on organization brand image. Hence, this study was conducted using a case of ethio-telecom. The study used quantitative study involved 123 sales persons and 10 purposively sampled interviewees from 10 sales branch offices in Addis Ababa. The quantitative data was cleaned, organized and analyzed using STATA version 11 software and qualitative data was analyzed using appropriate qualitative data analysis method. Thirty-five (28.5%) were between 26 – 30 years of age, 52.0% were males and 68.3% were married. The majority (75.6%) were first-degree holders and fifty-seven (46.3%) earn between 5,000 – 10,000 Birr per month. Fifty-six (45.5%) of the study participants has worked above 10 years in ethio-telecom and nearly half (48.8%) worked as sales persons between 2 – 5 years. The personality trait finding showed, 64.3% had openness, sixty-three (51.2%) had conscientiousness, 57.8% had extraversion, 65.9% had agreeableness and eighty-six (69.9%) had low neuroticism personality trait. Over four in ten study participants reported that ethio-telecom did not have good brand image among its customers and nearly half of them reported that ethio-telecom did not have a good brand image among the public, media and its employees. Years of experience in ethio-telecom was found to be a significant determinant (p<0.05) of all personality traits except agreeableness. Therefore, significant amount of organization brand image, 82.1%, influenced by sales persons' personality traits, which means independent variable statistically and significantly predictor of the dependent variable (organization brand image). Extraversion personality trait was a significant predictor of brand image among employees and strongly correlated (p<0.05). The qualitative study finding showed sales persons did not have good understanding of the personality traits. In conclusion, personality traits except openness showed significant effect on organization brand image. Sales persons in ethio-telecom strongly did not agree that ethio-telecom had a good brand image. Moreover, sales persons did not have good understanding of the personality traits. Hence, considering the study limitations actions need to be taken based on the recommendations
Route Reservation Architecture in Tandem Transportation Networks with the Asymmetric Cell Transmission Model
Creators: name: Georgantas, Antonios
name: Menelaou, Charalambos
name: Panayiotou, Christos
Publisher: name: Zenodo
Year: 2020

description: Traffic congestion in big cities has been proven to be a difficult problem with suboptimal effects in terms of driver delay and frustration, cost and impact on the environment. In principle, many transportation networks lack a unified framework, which will coordinate the traffic in such a manner, in order to suppress congestion and at the same time improve the travel time of the users situated in it. The rapid advancements in information, communication, and computation technologies have given rise to more elaborate modeling frameworks, aiming to act as the coordination unit necessary to counter the issue of congestion in real-time conditions. Such actions might have an adverse effect on the efficiency of the network, prospectively leading to greater waiting time intervals for each individual driver. We propose a macroscopic model equipped with an underlying reservation feature, known as Route Reservation Architecture (RRA). Vehicles enter the network (mainstream-wise or from the on-ramps) as long as this inflow does not incur a density that exceeds the network's critical density. Those vehicles prospectively exceeding the critical density are stored as queues at the origin of the motorway stretch and within the on-ramps Kotsialos and Papageorgiou (2004). Once there is sufficient space, for those vehicles to be accommodated by the respective cell of the network, they are discharged from their queueing instance at their respective origin, moving towards their assigned path freely. In previous works, this architecture has been only applied in microscopic simulations in the context of urban networks without the influence of source terms (on- ramps) Menelaou et al. (2017). When the critical density of the stretch is reached, the reservations are activated, instigating a waiting interval to the vehicles stored at queues, allowing vehicles only to enter the network at a later time instant, such that the critical density is not crossed. In this vein, we avoid the congested region and operate only at free-flow conditions. Our target is to investigate the effectiveness of this architecture, i.e. to minimize the Total Travel Time (TTT) of the vehicles present in the network, along with the vehicles situated in the queues, through a macroscopic simulation framework.
Can we reconcile the TA excess and hotspot with Auger observations?
Creators: name: Globus, Noemie
name: Allard, Denis
name: Parizot, Etienne
name: Lachaud, Cyril
name: Piran, Tsvi
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: The Telescope Array (TA) shows a 20$^{\circ}$ hotspot as well as an excess of UHECRs above 50~EeV when compared with the Auger spectrum. We consider the possibility that both the TA excess and hotspot are due to a dominant source in the Northern sky. We carry out detailed simulations of UHECR propagation in both the intergalactic medium and the Galaxy, using different values for the intergalactic magnetic field. We consider two general classes of sources: transients and steady, adopting a mixed UHECR composition that is consistent with the one found by Auger. The spatial location of the sources is draw randomly. We generate Auger-like and TA-like data sets from which we determine the spectrum, the sky maps and the level of anisotropy. We find that, while steady sources are favored over transients, it is unlikely to account for all the currently available observational data. While we reproduce fairly well the Auger spectrum for the vast majority of the simulated data sets, most of the simulated data sets with a spectrum compatible with that of TA (at most a few percent depending on density model tested) show a much stronger anisotropy than the one observed. We find that the rare cases in which both the spectrum and the anisotropy are consistent require a steady source within $\sim 10$ Mpc, to account for the flux excess, and a strong extragalactic magnetic field $\sim 10$ nG, to reduce the excessive anisotropy.
description: 28 pages, 19 figures, accepted in ApJ
Performance of algebraic multigrid methods for non-symmetric matrices arising in particle methods
Creators: name: Seibold, Benjamin
Publisher: name: arXiv
Year: 2009
Subjects: subject: Numerical Analysis (math.NA)
subject: FOS: Mathematics
subject: 65N06, 65N55, 90C05

description: Large linear systems with sparse, non-symmetric matrices arise in the modeling of Markov chains or in the discretization of convection-diffusion problems. Due to their potential to solve sparse linear systems with an effort that is linear in the number of unknowns, algebraic multigrid (AMG) methods are of fundamental interest for such systems. For symmetric positive definite matrices, fundamental theoretical convergence results are established, and efficient AMG solvers have been developed. In contrast, for non-symmetric matrices, theoretical convergence results have been provided only recently. A property that is sufficient for convergence is that the matrix be an M-matrix. In this paper, we present how the simulation of incompressible fluid flows with particle methods leads to large linear systems with sparse, non-symmetric matrices. In each time step, the Poisson equation is approximated by meshfree finite differences. While traditional least squares approaches do not guarantee an M-matrix structure, an approach based on linear optimization yields optimally sparse M-matrices. For both types of discretization approaches, we investigate the performance of a classical AMG method, as well as an AMLI type method. While in the considered test problems, the M-matrix structure turns out not to be necessary for the convergence of AMG, problems can occur when it is violated. In addition, the matrices obtained by the linear optimization approach result in fast solution times due to their optimal sparsity.
description: 16 pages, 7 figures
An exact particle method for scalar conservation laws and its application to stiff reaction kinetics
Creators: name: Farjoun, Yossi
name: Seibold, Benjamin
Publisher: name: arXiv
Year: 2010
Subjects: subject: Numerical Analysis (math.NA)
subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics
subject: 65M25, 35L65

description: An "exact" method for scalar one-dimensional hyperbolic conservation laws is presented. The approach is based on the evolution of shock particles, separated by local similarity solutions. The numerical solution is defined everywhere, and is as accurate as the applied ODE solver. Furthermore, the method is extended to stiff balance laws. A special correction approach yields a method that evolves detonation waves at correct velocities, without resolving their internal dynamics. The particle approach is compared to a classical finite volume method in terms of numerical accuracy, both for conservation laws and for an application in reaction kinetics.
description: 14 page, 7 figures, presented in the Fifth International Workshop on Meshfree Methods for Partial Differential Equations
A comparative study of the efficiency of jet schemes
Creators: name: Chidyagwai, Prince
name: Nave, Jean-Christophe
name: Rosales, Rodolfo Ruben
name: Seibold, Benjamin
Publisher: name: arXiv
Year: 2011
Subjects: subject: Numerical Analysis (math.NA)
subject: FOS: Mathematics
subject: 65M25, 65M12, 35L04

description: We present two versions of third order accurate jet schemes, which achieve high order accuracy by tracking derivative information of the solution along characteristic curves. For a benchmark linear advection problem, the efficiency of jet schemes is compared with WENO and Discontinuous Galerkin methods of the same order. Moreover, the performance of various schemes in tracking solution contours is investigated. It is demonstrated that jet schemes possess the simplicity and speed of WENO schemes, while showing several of the advantages as well as the accuracy of DG methods.
description: 12 pages, 6 figures, presented at the conference Mathematical Modeling and Applications to Industrial Problems 2011
Energy dependence of hadron polarization in $e^+e^-\to hX$ at high energies
Creators: name: Chen, Kai-bao
name: Yang, Wei-hua
name: Zhou, Ya-jin
name: Liang, Zuo-tang
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The longitudinal polarization of hyperons in $e^+e^-$ annihilation at high energies depends on the longitudinal polarization of the quark produced at the $e^+e^-$ annihilation vertex whereas the spin alignment of vector mesons is independent of it. They exhibit very different energy dependences. We use the longitudinal polarization of Lambda hyperon and the spin alignment of $K^*$ as examples and present numerical results of energy dependences. We present the results at the leading twist with perturbative QCD evolutions of fragmentation functions at the leading order.
description: 25 pages, 8 figures
The LHC di-photon excess and Gauge Coupling Unification in Extra $Z^\prime$ Heterotic-String Derived Models
Creators: name: Ashfaque, J.
name: Rose, L. Delle
name: Faraggi, A. E.
name: Marzo, C.
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The di-photon excess observed at the LHC can be explained as a Standard Model singlet that is produced and decays by heavy vector-like colour triplets and electroweak doublets in one-loop diagrams. The characteristics of the required spectrum are well motivated in heterotic-string constructions that allow for a light $Z^\prime$. Anomaly cancellation of the $U(1)_{Z^\prime}$ symmetry requires the existence of the Standard Model singlet and vector-like states in the vicinity of the $U(1)_{Z^\prime}$ breaking scale. In this paper we show that the agreement with the gauge coupling data at one-loop is identical to the case of the Minimal Supersymmetric Standard Model, owing to cancellations between the additional states. We further show that effects arising from heavy thresholds may push the supersymmetric spectrum beyond the reach of the LHC, while maintaining the agreement with the gauge coupling data. We show that the string inspired model can indeed account for the observed signal and discuss the feasibility of obtaining viable scalar mass spectrum.
description: 26 pages. 11 figures. Published version
Jet schemes for advection problems
Creators: name: Seibold, Benjamin
name: Nave, Jean-Christophe
name: Rosales, Rodolfo Ruben
Publisher: name: arXiv
Year: 2011
Subjects: subject: Numerical Analysis (math.NA)
subject: FOS: Mathematics
subject: 65M25, 65M12, 35L04

description: We present a systematic methodology to develop high order accurate numerical approaches for linear advection problems. These methods are based on evolving parts of the jet of the solution in time, and are thus called jet schemes. Through the tracking of characteristics and the use of suitable Hermite interpolations, high order is achieved in an optimally local fashion, i.e. the update for the data at any grid point uses information from a single grid cell only. We show that jet schemes can be interpreted as advect-and-project processes in function spaces, where the projection step minimizes a stability functional. Furthermore, this function space framework makes it possible to systematically inherit update rules for the higher derivatives from the ODE solver for the characteristics. Jet schemes of orders up to five are applied in numerical benchmark tests, and systematically compared with classical WENO finite difference schemes. It is observed that jet schemes tend to possess a higher accuracy than WENO schemes of the same order.
description: 26 pages, 6 figures; based on a poster presentation at the conference Fluid Dynamics, Analysis, and Numerics 2010
Reaction Data in PubChem
Creators: name: Cheng, Tiejun
name: Bolton, Evan
name: Schymanski, Emma
Publisher: name: Zenodo
Year: 2023
Subjects: Reactions
Transformations
PubChem
NORMAN-SLE

description: A presentation at the enviPathPlus workshop (held online) on "Reaction Data in PubChem". Presented by E. Schymanski on behalf of all authors. See slides for details and many hyperlinks - thanks to Kathrin Fenner for the opportunity!
Small quenches and thermalization
Creators: name: Kennes, D. M.
name: Pommerening, J. C.
name: Diekmann, J.
name: Karrasch, C.
name: Meden, V.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We study the expectation values of observables and correlation functions at long times after a global quantum quench. Our focus is on metallic (`gapless') fermionic many-body models and small quenches. The system is prepared in an eigenstate of an initial Hamiltonian, and the time evolution is performed with a final Hamiltonian which differs from the initial one in the value of one global parameter. We first derive general relations between time-averaged expectation values of observables as well as correlation functions and those obtained in an eigenstate of the final Hamiltonian. Our results are valid to linear and quadratic order in the quench parameter g and generalize prior insights in several essential ways. This allows us to develop a phenomenology for the thermalization of local quantities up to a given order in g. Our phenomenology is put to a test in several case studies of one-dimensional models representative of four distinct classes of Hamiltonians: quadratic ones, effectively quadratic ones, those characterized by an extensive set of (quasi-) local integrals of motion, and those for which no such set is known (and believed to be nonexistent). We show that for each of these models, all observables and correlation functions thermalize to linear order in g. The more local a given quantity, the longer the linear behavior prevails when increasing g. Typical local correlation functions and observables for which the term O(g) vanishes thermalize even to order g^2. Our results show that lowest order thermalization of local observables is an ubiquitous phenomenon even in models with extensive sets of integrals of motion.
description: version as published
Maximizing complementary quantities by projective measurements
Creators: name: Souza, Leonardo A. M.
name: Bernardes, Nadja K.
name: Rossi, Romeu
Publisher: name: arXiv
Year: 2016
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: In this work we study the so-called quantitative complementarity quantities. We focus in the following physical situation: two qubits ($q_A$ and $q_B$) are initially in a maximally entangled state. One of them ($q_B$) interacts with a $N$-qubit system ($R$). After the interaction, projective measurements are performed in each of the qubits of $R$, in a basis that is chosen after independent optimization procedures: maximization of the visibility, the concurrence and the predictability. For a specific maximization procedure, we study in details how each of the complementary quantities behave, conditioned on the intensity of the coupling between $q_B$ and the $N$ qubits. We show that, if the coupling is sufficiently "strong", independent of the maximization procedure, the concurrence tends to decay quickly. Interestingly enough, the behavior of the concurrence in this model is similar to the entanglement dynamics of a two qubit system subjected to a thermal reservoir, despite that we consider finite $N$. However the visibility shows a different behavior: its maximization is more efficient for stronger coupling constants. Moreover, we investigate how the distinguishability, or the information stored in different parts of the system, is distributed for different couplings.
description: Version very close to the accepted in Brazilian Journal of Physics
MA Philosophy Thesis Jochem Koopmans s4529901.pdf
Creators: name: Koopmans, Jochem
Publisher: name: figshare
Year: 2022
Subjects: subject: 220312 Philosophy of Cognition
subject: FOS: Philosophy, ethics and religion
subject: 220314 Philosophy of Mind (excl. Cognition)

description: The thesis consists of two parts: an article and a PhD-proposal. In the article, ambiguities in the concept of access consciousness are explored and a more precise formulation is offered. Some of its immediate consequences are also described. The PhD-proposal deals with enactivism, a framework that has been used to explain the existence of minds. I propose to investigate common traits in various enactivist theories in order to develop a domain-general enactivism.