Exact Solution of the Dimer Model on the Square and Triangular Lattice

In this thesis we give an exact solution of the dimer model on the square and triangular lattice with different boundary conditions. Concretely, we being by discussing Kasteleyn’s contribution to the dimer model studies. We then prove the Pfaÿan Sign Theorem for the dimer model on a triangular lattice embedded in the torus. More specifcally, we prove that the Pfaffan of the Kasteleyn periodic-periodic matrix is negative, while the Pfaÿans of the Kasteleyn periodic-antiperiodic, antiperiodic-periodic, and antiperiodic-antiperiodic matrices are all positive. The proof is based on the Kasteleyn identities and on small weight expansions. Finally, we obtain the full asymptotic expansion of the partition function of the two-dimensional dimer model on the m × n square lattice with free and periodic boundary conditions. We show that the asymptotic expansion goes over powers of S−1, where S =(m + 1)(n + 1) for the free boundary conditions, and S = mn for the periodic boundary conditions. The coefficients of the asymptotic expansion are expressed in terms of the Kronecker double series, the Dedekind eta function, and the Jacobi theta functions. Furthermore, as an application of the Pfaÿan Sign Theorem, we obtain an asymptotic behavior with an exponentially small error term of the partition function of the two-dimensional dimer model on the m × n triangular lattice on the torus

Towards gradual integration of the western Balkans into the European Union: the case of Serbia

This paper examined whether the revised enlargement methodology represented another step in the direction of gradual EU membership of the Western Balkans. The research problem was based on considerations that the EU enlargement domain has for years been characterized by political stagnation. The research aimed to show that a differentiated accession approach might have been beneficial for Serbia, as a front-runner membership candidate. In terms of methods, the author analyzes the concepts and the applicability of the 'three-tiered accession' and 'staged accession', having in mind the recently altered enlargement methodology. The author argues that the gradual integration would have been beneficial for two reasons: 1) validating the candidates' already achieved progress, offering tangible incentives, and potentially preventing the democratic backsliding; 2) taking the pre-scheduled accession dates off the table. Considering that the EU is unlikely to expand further, the author concludes that the gradual membership concept might apply solely to the WB, while also reassuring the Member States regarding the primacy of individual merits and excluding the speedy accessions proposals

A time-predefined approach to course timetabling

A common weakness of local search metaheuristics, such as Simulated Annealing, in solving combinatorial optimization problems, is the necessity of setting a certain number of parameters. This tends to generate a significant increase in the total amount of time required to solve the problem and often requires a high level of experience from the user. This paper is motivated by the goal of overcoming this drawback by employing "parameter-free" techniques in the context of automatically solving course timetabling problems. We employ local search techniques with "straightforward" parameters, i.e. ones that an inexperienced user can easily understand. In particular, we present an extended variant of the "Great Deluge" algorithm, which requires only two parameters (which can be interpreted as search time and an estimation of the required level of solution quality). These parameters affect the performance of the algorithm so that a longer search provides a better result - as long as we can intelligently stop the approach from converging too early. Hence, a user can choose a balance between processing time and the quality of the solution. The proposed method has been tested on a range of university course timetabling problems and the results were evaluated within an International Timetabling Competition. The effectiveness of the proposed technique has been confirmed by a high level of quality of results. These results represented the third overall average rating among 21 participants and the best solutions on 8 of the 23 test problems.

Incidencia del tratamiento tributario de los contratos de consorcio sin contabilidad independiente en los resultados económicos de la empresa Constructora e Inversiones Soto S.A.C., Trujillo, año 2018

En el marco del panorama económico, el sector construcción ha tenido un incremento importante tratándose de la ejecución de obras a través de consorcios, en un 70% en el año 2018, razón por la cual, las empresas constructoras buscan asociarse para poder licitar con el estado, a través de los contratos de consorcio. El presente trabajo de investigación incidencia del tratamiento tributario de los contratos de consorcios sin contabilidad independiente, en los resultados económicos de la empresa Constructora e Inversiones Soto S.A.C., Trujillo, año 2018, tiene como objetivo general determinar la incidencia del tratamiento tributario de los contratos de consorcios sin contabilidad independiente, en los resultados económicos de la empresa Constructora e Inversiones Soto S.A.C., Trujillo, año 2018. Para poder desarrollar la investigación se utilizó el diseño metodológico descriptivo-correlacional y la técnica que se utilizo fue el test de control interno donde se formularon 20 preguntas al contador general de la empresa sobre los procedimientos y obligaciones de los consorcios, empleando la escala de Likert; además, se analizó la información de los estados de resultados de la empresa que mostró una inadecuada atribución de los ingresos, costos y/o gastos por parte del operador y operaciones que no cumplen con los requisitos necesarios para su deducción, en consecuencia, se reformularon los estados de resultados del período 2018 con la adecuada atribución al operador incrementando de manera significativa el pago del impuesto a la renta en 669,678 soles, obteniendo un beneficio económico de 207,557 soles, impactando en el ratio de margen neto sobre ventas que disminuyó de 4.2% a 1.18% de rentabilidad; respecto al Impuesto general a la ventas, el registro de compras del operador disminuyó en 6,955,385 soles por costos y/o gastos, reduciendo su crédito fiscal en 1,251,969 soles. Habiéndose desarrollado el presente trabajo de investigación y evaluando los resultados obtenidos, se concluyó que un adecuado tratamiento tributario de los contratos de consorcio sin contabilidad independiente incide positivamente en los resultados económicos de la empresa Constructora e Inversiones Soto S.A.C., año 2018.In the context of the economic landscape, the construction sector has had a significant increase in the execution of works through consortia, 70% in 2018, which is why construction companies are looking to partner so that they can bid with the state, through consortium contracts. Present research work impacts the tax treatment of consortium contracts without independent accounting, in the economic results of the company Constructora e Inversiones Soto INC., Trujillo, year 2018, has the general objective of determining the impact of tax treatment of consortia contracts without independent accounting, in the economic results of the company Constructora e Inversiones Soto INC., Trujillo, year 2018. To be able to develop the research the descriptive-corelated methodological design was used and the technique used was the internal control test, where 20 questions were asked to the company's general accountant on the procedures and obligations of consortia, using the Likert scale; in addition, the company's income statement information was analyzed which showed inadequate attribution of income, costs and/or expenses by the operator and operations that do not meet the requirements for deduction, the 2018 results statements were reformulated with adequate attribution to the operator by significantly increasing, the payment of income tax in 669,678 soles, making an economic profit of 207,557 soles, impacting on the net margin-on sales ratio that declined from 4.2% to 1.18% profitability; general sales tax, the operator's purchasing record decreased by 6,955,385 soles for costs and/or expenses, reducing its tax credit by 1,251,969 soles.it was concluded that adequate tax treatment of consortium contracts without independent accounting has a positive impact on the economic results of the company Constructora e Inversiones Soto INC., 2018.Tesi

Some Issues of Microprocessor-based Power System Stabilizer Implementation

Abstract -In this paper, we present our experience gained through implementation of the IEEE PSS2B type of power system stabilizers (PSSs). The paper describes a particular case of implementing this type of PSS in microprocessorbased digital voltage regulator with limited processing resources. The following issues have been elaborated: (i) choice of sampling time and its influence on the performance of the PSS and on the processor utilization, (ii) selection of the lead-lags time constants and their influences on the noise amplification and (iii) scaling associated with the integer arithmetic. The abovementioned problems have been analyzed by simulations and experimentally on a laboratory power plant, and appropriate solutions have been proposed. Finally, the PSS2B has been implemented on real power plants, and a simple method for field verification of tuned PSS2B parameters is explained

Towards the realisation of a fully integrated Interactive Computer Music System (ICMS), adopting Transformative Expressive Dimensions

The principal aim of conducting this research project is to advance the field of human-computer interaction (HCI) in music through the inception of new and exciting ideas relating to the conceptual and aesthetic values and characteristics associated with interactive computer music system (ICMS) design, development and implementation. This exploratory investigation has been carried out through the continued development of a unique screen-based ICMS, ScreenPlay, which brings together aspects of many prominent, pre-existing system design models along with other novel inclusions, such as the capability of operating as both a multi-user-and-computer collaborative, improvisatory interactive performance system and a single-user-and-computer studio compositional tool for Ableton Live, and the implementation of Markovian generative and topic-theory-inspired transformative algorithms to provide new ways of breaking routine in collaborative improvisation and generating new musical ideas in composition, as well as providing new dimensions of expressivity. The intention being that the culmination of these efforts should be the establishment of a system design model that offers the user(s)/performer(s) a significantly more engaging, intuitive and complete interactive musical experience than that afforded by any currently available system. This is not an objective that should be perceived as being born of arrogance or ignorance; many established and commercially successful ICMSs provide users with amazing and unique experiences, and the value of their contribution to the field of HCI in music is not to be underestimated or taken for granted. However, for all the relative strengths and possibilities of interacting with these systems, there is potential for improvement and evolution in equal measure. This is largely due to the tendency of ICMS developers to focus (sometimes almost exclusively) on providing the best possible experience when engaging with a system only with regard to a single parameter/characteristic of the musical output at the expense of providing depth-in-control at any level over some or any of the many other parameters/characteristics available. It is necessary for all forms of technology and art to continually improve and evolve beyond what has already been achieved in order to avoid extinction, and nowhere is this more apparent than within an innovative and niche field of research such as HCI in music

Many Labs 5:Testing pre-data collection peer review as an intervention to increase replicability

Replication studies in psychological science sometimes fail to reproduce prior findings. If these studies use methods that are unfaithful to the original study or ineffective in eliciting the phenomenon of interest, then a failure to replicate may be a failure of the protocol rather than a challenge to the original finding. Formal pre-data-collection peer review by experts may address shortcomings and increase replicability rates. We selected 10 replication studies from the Reproducibility Project: Psychology (RP:P; Open Science Collaboration, 2015) for which the original authors had expressed concerns about the replication designs before data collection; only one of these studies had yielded a statistically significant effect (p < .05). Commenters suggested that lack of adherence to expert review and low-powered tests were the reasons that most of these RP:P studies failed to replicate the original effects. We revised the replication protocols and received formal peer review prior to conducting new replication studies. We administered the RP:P and revised protocols in multiple laboratories (median number of laboratories per original study = 6.5, range = 3?9; median total sample = 1,279.5, range = 276?3,512) for high-powered tests of each original finding with both protocols. Overall, following the preregistered analysis plan, we found that the revised protocols produced effect sizes similar to those of the RP:P protocols (?r = .002 or .014, depending on analytic approach). The median effect size for the revised protocols (r = .05) was similar to that of the RP:P protocols (r = .04) and the original RP:P replications (r = .11), and smaller than that of the original studies (r = .37). Analysis of the cumulative evidence across the original studies and the corresponding three replication attempts provided very precise estimates of the 10 tested effects and indicated that their effect sizes (median r = .07, range = .00?.15) were 78% smaller, on average, than the original effect sizes (median r = .37, range = .19?.50)

Neutron emission from electromagnetic dissociation of Pb nuclei at √ s NN = 2.76 TeV measured with the ALICE ZDC

The ALICE Zero Degree Calorimeter system (ZDC) is composed of two identical sets of calorimeters, placed at opposite sides with respect to the interaction point, 114 meters away from it, complemented by two small forward electromagnetic calorimeters (ZEM). Each set of detectors consists of a neutron (ZN) and a proton (ZP) ZDC. They are placed at zero degrees with respect to the LHC axis and allow to detect particles emitted close to beam direction, in particular neutrons and protons emerging from hadronic heavy-ion collisions (spectator nucleons) and those emitted from electromagnetic processes. For neutrons emitted by these two processes, the ZN calorimeters have nearly 100% acceptance. During the √ sNN = 2.76 TeV Pb-Pb data-taking, the ALICE Collaboration studied forward neutron emission with a dedicated trigger, requiring a minimum energy deposition in at least one of the two ZN. By exploiting also the information of the two ZEM calorimeters it has been possible to separate the contributions of electromagnetic and hadronic processes and to study single neutron vs. multiple neutron emission. The measured cross sections of single and mutual electromagnetic dissociation of Pb nuclei at √ s NN = 2.76 TeV, with neutron emission, are σ single EMD = 187:4 ± 0.2 (stat.)-11.2 +13.2 (syst.) b and σmutual EMD = 5.7 ± 0.1 (stat.) ±0.4 (syst.) b, respectively [1]. This is the first measurement of electromagnetic dissociation of 208Pb nuclei at the LHC energies, allowing a test of electromagnetic dissociation theory in a new energy regime. The experimental results are compared to the predictions from a relativistic electromagnetic dissociation model'701st International Conference on New Frontiers in Physics, ICFP 20122012-06-10Kolymbari, Crete; Greecesem informaçã