205,667 research outputs found
Homologous ferrocene phosphines
No full textTitle: Homologous ferrocene phosphines Author: Bc. Petr Vosáhlo Department: Department of Inorganic Chemistry Supervisor: prof. RNDr. Petr Štěpnička, Ph.D., DSc. Abstract: This thesis describes the synthesis and coordination behaviour of ferrocene diphosphines derived from 1,1'-bis(diphenylphosphino)ferrocene (dppf). Dppf is one of the most succesful ferrocene ligands, which can be used in various metal-catalyzed reactions. This study aimed to prepare analogous ligands with one dialkylphosphino substituent and one (diphenylphosphino)methyl group. These ligands were oxidized by KSeCN to afford the corresponding phosphinoselenides. The phosphinoselenides were used to assess sigma-donor abilities by measuring the coupling constant 1 JSeP via 31 P NMR spectroscopy. Lastly, the coordination behaviour of these ligands in palladium complexes was studied. The homologous ligands usually formed a mixtures containing a chelate complex and dimeric species with trans- coordinated ligands. Key words: ferrocene, phosphines, homologous ligands, palladium(II) complexes, structure elucidation
Cabaret plays by Petr Potemkin
No full textThis article discusses studies of some works by Petr P. Potemkin, a poet and playwright of the Silver Age. His plays for revue theatres and cabarets have not been studied yet, and the author of the article suggests her understanding of this part of Potemkin's artistic legacy. The article studies specifics features of the one-act drama of the early 20th century
Tschermaks Min. Petr. Mitt.
No full textp. 218-235The petrology and chemistry of alkaline rhyolites from Western Bahia
State are investigated. Original mineralogy and bulk chemistry are modified
by secondary processes (cataclastic metamorphism, hydrothermal
leaching). The overall chemistry suggests a pattern consistent with derivation
from material of near quartz-feldspar cotectic composition. This may
represent a pathway for crustal fractionation and for partial melting within
the continental crust of material of potassium-rich granitic composition.
Ancient basemental biotite-rich gneisses are considered to be the most
probable starting material. Possible correlations of volcanism with the
main tectonics of the area and of the whole Brazilian shield are discussed.Salvado
Modeling a Distribution of Mortgage Credit Losses
No full textOne of the biggest risks arising from financial operations is the risk of counterparty default, commonly known as a “credit risk”. Leaving unmanaged, the credit risk would, with a high probability, result in a crash of a bank. In our paper, we will focus on the credit risk quantification methodology. We will demonstrate that the current regulatory standards for credit risk management are at least not perfect, despite the fact that the regulatory framework for credit risk measurement is more developed than systems for measuring other risks, e.g. market risks or operational risk. Generalizing the well known KMV model, standing behind Basel II, we build a model of a loan portfolio involving a dynamics of the common factor, influencing the borrowers’ assets, which we allow to be non-normal. We show how the parameters of our model may be estimated by means of past mortgage deliquency rates. We give a statistical evidence that the non-normal model is much more suitable than the one assuming the normal distribution of the risk factors. We point out how the assumption that risk factors follow a normal distribution can be dangerous. Especially during volatile periods comparable to the current crisis, the normal distribution based methodology can underestimate the impact of change in tail losses caused by underlying risk factors.Credit Risk, Mortgage, Delinquency Rate, Generalized Hyperbolic Distribution, Normal Distribution
Spatially explicit farming system modelling for an efficient agri-environmental policy design
No full textA mathematical programming model is developed and associated to a spatial pattern index (Ripley L function) to analyse the optimal reserve design and implementation for the Little Bustard conservation in Plaine de Niort. The model structure corresponds to three spatial levels, fields, farm and landscape. Simple in terms of area representation, it is detailed in terms of farm behaviour and spatially explicit. The model is applied in a normative and in a positive way. The major findings of the normative approach relate to the trade-offs between the reserve pattern and its cost. It was found that the environmentally optimal reserve, which is randomly dispersed across the zone, is the most costly one. Within the positive approach, it is illustrated that the various reserve patterns generated within the normative approach can be obtained through relatively simple uniform contract structures. The most effective contract structure is a degressive set of two payments enabling the farms to enroll at least a small share of their land.Biodiversity, spatial optimization, mathematical programming, Environmental Economics and Policy, Farm Management,
Main Flaws of The Collateralized Debt Obligation‘s: Valuation Before And During The 2008/2009 Global Turmoil
No full textAs a result of the 2008 financial crisis, the world credit markets stalled significantly and raised the doubts of market participants and policymakers about the proper and fair valuation of financial derivatives and structured products such as collateralized debt obligations (CDOs). The aim of the paper is to contribute to the understanding of CDOs and shed light on CDO valuation based on data before and during the current financial upheaval. We present the One Factor Model based on a Gaussian Copula and test five hypothesizes. Based on the results we discovered four main deficiencies of the CDO market. For our modelling we used data of the CDX NA IG 5Y V3 index from 20 September 2007 until 27 February 2009 and its quotes we appropriately transform into CDO quotes. Based on the results we discovered four main deficiencies of the CDO market: i) an insufficient analysis of underlying assets by both investors and rating agencies; ii) the valuation model was usually based only on expected cash-flows when neglecting other factors such mark-to-market losses or correlation risk; iii) mispriced correlation; and finally iv) the mark-to-market valuation obligation for financial institutions should be reviewed. Based on the mentioned recommendations we conclude that the CDO market has a chance to be regenerated. However, the future CDO market would then be more conscious, driven by smarter motives rather than by poor understanding of risks involved in CDOs.collateralized debt obligations, Gaussian Copula, valuation, securitization
Ah ! qui brûle d'amour--Nur wer die Sehnsucht kennt. Poésie de Goethe. Traduite par S. Donauroff. Von W. Goethe
No full textTitre uniforme : Čajkovskij, Petr Ilʹič (1840-1893). Compositeur. [Net, tolʹko tot, kto znal. ČS 216]Collection : Edition Jurgenson. Romances de P. Tschaïkowsky ; Op. 6. N°
Vous ignorez qui j'ose aimer--Nein, wen ich liebe. Traduction de Donaouroff. Ged v. Müsset.... Op. 28. N° 1
No full textTitre uniforme : Čajkovskij, Petr Ilʹič (1840-1893). Compositeur. [6 romances. ČS 238-243] (multilingue)Collection : Edition Jurgenson. Romances de P. Tschaïkowsky ; N° 1
Derivatives combining the fragment of pyrazinamide and 4-aminosalicylic acid as antimycobacterial compounds
No full textCharles University Faculty of Pharmacy in Hradec Králové Department of Pharmaceutical chemistry and Pharmaceutical analysis Author: Petr Šlechta Supervisor: doc. PharmDr. Jan Zitko, Ph.D. Consultant: MSc. Ghada Basem Bouz, Ph.D. Title of diploma thesis: Derivatives combining the fragment of pyrazinamide and 4-aminosalicylic acid as antimycobacterial compounds According to WHO, tuberculosis (TB) is the leading cause of death from a single infectious organism worldwide and the number of cases with drug resistant TB is still increasing, creating the need for new antituberculotics. Therefore, we report design, synthesis and antimicrobial evaluation of a series of hybrid compounds combining different pyrazinamide derivates and p- aminosalicylic acid as potential antituberculotic agents. The compounds were prepared by mixing different pyrazinecarboxylic acids, after activation by 1,1'-carbonyldiimidazole, with p- aminosalicylic acid in dimethylsulfoxide as a solvent. Obtained compounds were in vitro tested for their antimycobacterial activity against M. tuberculosis H37Rv, M. tuberculosis H37Ra and four other mycobacterial strains. Prepared compounds were also in vitro screened for antibacterial, antifungal, and cytotoxic (HepG2) activity. Most compounds showed antimycobacterial activity in range of..
Petr Fidelius. L'esprit post-totalitaire
No full textVernochet Jean-Michel. Petr Fidelius. L'esprit post-totalitaire. In: Politique étrangère, n°4 - 1986 - 51ᵉannée. p. 1121
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