Search results for "pi-"
showing 10 items of 844 documents
Random Structural Modification of a Low-Band-Gap BODIPY-Based Polymer
2017
International audience; A BODIPY thiophene polymer modified by extending conjugation of the BODIPY chromophore is reported. This modification induces tunability of energy levels and therefore absorption wavelengths in order to target lower energies.
Porphyrins and BODIPY as Building Blocks for Efficient Donor Materials in Bulk Heterojunction Solar Cells
2017
International audience; Advances in the synthesis and application of highly efficient polymers and small molecules over the last two decades have enabled the rapid advancement in the development of organic solar cells and photovoltaic technology as a promising alternative to conventional solar cells, based on silicon and other inorganic semiconducting materials. Among the different types of organic semiconducting materials, porphyrins and BODIPY-based small molecules and conjugated polymers attract high interest as efficient semiconducting organic materials for dye sensitized solar cells and bulk heterojunction organic solar cells. The highest power conversion efficiency exceeding 9% has be…
Codimensions of algebras and growth functions
2008
Abstract Let A be an algebra over a field F of characteristic zero and let c n ( A ) , n = 1 , 2 , … , be its sequence of codimensions. We prove that if c n ( A ) is exponentially bounded, its exponential growth can be any real number >1. This is achieved by constructing, for any real number α > 1 , an F-algebra A α such that lim n → ∞ c n ( A α ) n exists and equals α. The methods are based on the representation theory of the symmetric group and on properties of infinite Sturmian and periodic words.
Sistēmu integrācija izmantojot MuleSoft Api-veidotas savienojamības pieeju
2022
Bakalaura darbā “Sistēmu integrācija izmantojot MuleSoft Api-veidotas savienojamības pieeju” tiek apskatīta Api-veidotas savienojamības pieeja un tās pielietošanas ieguvumi sistēmu integrēšanā. Darbā tiek pētīta un analizēta literatūra par sistēmu integrāciju, tās izplatītākajiem lietošanas piemēriem un savienošanas veidiem, kā arī sistēmu integrācijas arhitektūras modeļiem un MuleSoft piedāvāto integrācijas platformu. Arhitektūras modeļi tiek analizēti, un katram no tiem tiek noteiktas tā izmantošanas priekšrocības un trūkumi. Darbā ir izstrādāta divu sistēmu integrācija izmantojot MuleSoft piedāvāto integrāciju platformu un API-veidotas savienojamības pieeju kā arī apkopoti ieviestās inte…
Hipersensitīvā narcisma skalas (HSNS) un Narcistiskās personības iezīmju aptaujas (NPI40) adaptācija latviešu valodā
2020
Pētījuma mērķis bija pārbaudīt Hipersensitīvā narcisma skalas (HNS) un Narcistiskās personības iezīmju (NPI-40) iekšējo saskaņotību, retesta ticamību un konverģento validitāti saistībā ar pašcieņas rādītājiem. Pētījumā tika izvirzītas divas hipotēzes - hipersensitīvā narcisma rādītāji (HSNS) veidos negatīvu korelāciju ar pašcieņu un narcisma rādītāji (NPI40) veidos pozitīvu korelāciju ar pašcieņu. Pētījumā tika meklētas atbildes uz diviem izvirzītiem pētāmiem jautājumiem - vai aptaujām ir pietiekoši augsta iekšējā saskaņotība un, vai abu instrumentu mērījumi ir stabili laikā? Pētījumā tika izmantotas 3 aptaujas: Narcistisko personības iezīmju aptauja (Narcissistic Personality Inventory, Ras…
Characterization of neutrophil subsets in healthy human pregnancies
2014
We have previously shown that in successful pregnancies increased arginase activity is a mechanism that contributes to the suppression of the maternal immune system. We identified the main type of arginase-expressing cells as a population of activated low-density granulocytes (LDGs) in peripheral blood mononuclear cells and in term placentae. In the present study, we analyzed the phenotype of LDGs and compared it to the phenotype of normal density granulocytes (NDGs) in maternal peripheral blood, placental biopsies and cord blood. Our data reveal that only LDGs but no NDGs could be detected in placental biopsies. Phenotypically, NDGs and LDGs from both maternal and cord blood expressed diff…
The radiative decay of the Lambda(1405) and its two-pole structure
2007
We evaluate theoretically the radiative decay widths into $\gamma\Lambda$ and $\gamma\Sigma^0$ of the two poles of the $\Lambda(1405)$ found in chiral unitary theories and we find quite different results for each of the two poles. We show that, depending on which reaction is used to measure the $\Lambda(1405)$ radiative decays, one gives more weight to one or the other pole, resulting in quite different shapes in the $\gamma\Lambda(\Sigma^0)$ invariant mass distributions. Our results for the high-energy pole agree with those of the empirical determination of the $\gamma\Lambda$ and $\gamma\Sigma^0$ radiative widths (based on an isobar model fitting of the $K^-p$ atom data), which are someti…
Charm and hidden charm scalar mesons in the nuclear medium
2009
We study the renormalization of the properties of low-lying charm and hidden charm scalar mesons in a nuclear medium, concretely of the D-s0(2317) and the theoretical hidden charm state X(3700). We find that for the D-s0(2317), with negligible width at zero density, the width becomes about 100 MeV at normal nuclear-matter density, while in the case of the X(3700) the width becomes as large as 200 MeV. We discuss the origin of this new width and trace it to reactions occurring in the nucleus, while offering a guideline for future experiments testing these changes. We also show how those medium modifications will bring valuable information on the nature of the scalar resonances and the mechan…
Oxidative C-N fusion of pyridinyl-substituted porphyrins.
2018
International audience; The mild (electro) chemical oxidation of pyridin-2-ylthio-meso substituted Ni(II) porphyrins affords C-N fused cationic and dicationic pyridinium-based derivatives. These porphyrins are fully characterized and the molecular structure of one of them was confirmed by X-ray crystallography. A mechanism for the intramolecular oxidative C-N coupling is proposed based on theoretical calculations and cyclic voltammetry analyses.
"Table 14" of "Large-angle production of charged pions by 3 GeV/c - 12.9 GeV/c protons on beryllium, aluminium and lead targets"
2007
Double-differential cross section for PI- production from BE in the LAB system for PI- polar angle from 1.15 to 1.35 radians.