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Sofia University

EducationSofia, Bulgaria
About: Sofia University is a education organization based out in Sofia, Bulgaria. It is known for research contribution in the topics: Large Hadron Collider & Standard Model. The organization has 8533 authors who have published 15730 publications receiving 306320 citations. The organization is also known as: University of Sofia & BFUS.


Papers
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Journal ArticleDOI
Albert M. Sirunyan1, Armen Tumasyan1, Wolfgang Adam, Federico Ambrogi  +2399 moreInstitutions (209)
TL;DR: In this article, a search for additional scalar (H) or pseudoscalar (A) Higgs bosons decaying to a top quark pair in proton-proton collisions at a center-of-mass energy of 13 TeV is presented.
Abstract: A search is presented for additional scalar (H) or pseudoscalar (A) Higgs bosons decaying to a top quark pair in proton-proton collisions at a center-of-mass energy of 13 TeV. The data set analyzed corresponds to an integrated luminosity of 35.9 fb−1 collected by the CMS experiment at the LHC. Final states with one or two charged leptons are considered. The invariant mass of the reconstructed top quark pair system and variables that are sensitive to the spin of the particles decaying into the top quark pair are used to search for signatures of the H or A bosons. The interference with the standard model top quark pair background is taken into account. A moderate signal-like deviation compatible with an A boson with a mass of 400 GeV is observed with a global significance of 1.9 standard deviations. New stringent constraints are reported on the strength of the coupling of the hypothetical bosons to the top quark, with the mass of the bosons ranging from 400 to 750 GeV and their total relative width from 0.5 to 25%. The results of the search are also interpreted in a minimal supersymmetric standard model scenario. Values of mA from 400 to 700 GeV are probed, and a region with values of tan β below 1.0 to 1.5, depending on mA, is excluded at 95% confidence level.

78 citations

Journal ArticleDOI
TL;DR: A preferable octahedral environment around the transition metal centers is observed in polar solvents while the complexes retain their tetrahedral structure in non-polar media.

78 citations

Journal ArticleDOI
TL;DR: Analyzing the experimental data, two important characteristics of the drop-detachment process are identified: the velocity of spontaneous advance of the contact line and the line drag coefficient.

78 citations

Journal ArticleDOI
TL;DR: In this article, the authors reviewed the existing literature on transmission mechanism in Central and Eastern Europe and put it in a broader context of the problems related to research on monetary policy and attempted to conduct empirical analysis for 10 transition economies using analogous methodology for the same sample period 1995-2000.
Abstract: As more central banks across Central and Eastern Europe (CEE) move towards inflation control - either in the form of direct inflation targeting or indirectly through informal targets - good knowledge of transmission mechanism in the economy becomes crucial for implementing good policies. So far the volume of studies in the region devoted to this issue is not overly impressive. There have been no attempts made to study the issue in a comparative context of several economies. In the case of CEE, this research field, like many others, is naturally constrained by at least two important factors. The first is the lack of data in terms of both length of time series and of quality and reliability. The second is the constant institutional changes in the studied environment which renders the different models and techniques structurally unstable and the results - generally volatile. The purpose of this study is to review the existing literature on transmission mechanism in CEE and put it in a broader context of the problems related to research on monetary policy. Also, we attempted to conduct empirical analysis for 10 transition economies using analogous methodology for the same sample period 1995-2000. In this comparative framework a series of Granger causality tests and impulse response analysis were carried out to asses the strength of two major transmission channels: interest rate and exchange rate channel. Also in the empirical part, we tried to look for the existence of long-run relationships between the basic set of macroeconomic variables in the countries under investigation. The paper is composed as follows. Chapter 2 briefly reviews the transmission mechanism research in CEE with special emphasis on the origin of studies, methods used and general inferences. Then, chapter 3 presents a problembased discussion of issues related to transmission mechanism in the special context of transition economies. Goals, targets and tools of monetary policy as well a exchange rate regimes are reviewed and discussed. Chapters 4 and 5 present empirical results. Chapter 4 describes core inflation estimates and selection process as well as presents all remaining variables and tests for the level of integration. Chapter 5 includes the empirical analysis of transmission mechanism through Granger causality and impulse responses as well as cointegration analysis. Finally, chapter 7 concludes the paper with summary of results.

77 citations

Journal ArticleDOI
Kai S. Exner1
TL;DR: This viewpoint addresses the question how the definition of an optimum catalyst needs to be modified with respect to the requirements of Sabatier's principle when kinetic effects and the applied overpotential are included in the analysis.
Abstract: Volcano analyses have been established as a standard tool in the field of electrocatalysis for assessing the performance of electrodes in a class of materials. The apex of the volcano curve, where the most active electrocatalysts are situated, is commonly defined by a hypothetical ideal material that binds its reaction intermediates thermoneutrally at zero overpotential, in accordance with Sabatier's principle. However, recent studies report a right shift of the apex in a volcano curve, in which the most active electrocatalysts bind their reaction intermediates endergonically rather than thermoneutrally at zero overpotential. Focusing on two-electron process, this Viewpoint addresses the question of how the definition of an optimum catalyst needs to be modified with respect to the requirements of Sabatier's principle when kinetic effects and the applied overpotential are included in the analysis.

77 citations


Authors

Showing all 8600 results

NameH-indexPapersCitations
Michael Tytgat134144994133
Leander Litov133142492713
Eric Conte132120684593
Georgi Sultanov132149393318
Plamen Iaydjiev131128587958
Anton Dimitrov130123686919
Jordan Damgov129119585490
Borislav Pavlov129124586458
Jean-Laurent Agram128122184423
Cristina Botta128116079070
Jean-Charles Fontaine128119084011
Peicho Petkov128111183495
Muhammad Ahmad128118779758
Roumyana Hadjiiska126100373091
Mircho Rodozov12497270519
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Performance
Metrics
No. of papers from the Institution in previous years
YearPapers
202326
2022141
2021792
2020771
2019769
2018693