Search results for "bond"

The effect of silver nanoparticles, zinc oxide nanoparticles, and titanium dioxide nanoparticles on the push-out bond strength of fiber posts

2019

Background This study was undertaken to investigate the effect of intraradicular dentin pretreatment with silver nanoparticles (SNPs), zinc oxide nanoparticles (ZNPs), and titanium oxide nanoparticles (TNPs) on the push-out bond strength (PBS) of fiber posts to root dentin using two types of resin cements. Material and methods Eighty single-rooted human premolar roots were randomly divided into eight groups after endodontic treatment and post space preparation, according to the type of intraradicular dentin pretreatment with different nanoparticle solutions (n=20). The groups included no pretreatment (control) and pretreatments with SNPs, ZNPs, and TNPs. Each group was divided into 2 subgro…

Unravelling the Mysteries of the [3+2] Cycloaddition Reactions

2018

Influence of metal ions on the structures of Keggin polyoxometalate-based solids: Hydrothermal syntheses, crystal structures and magnetic properties

2006

Abstract Three new Keggin polyoxometalate (POM)-based compounds linked to 3d metal complexes have been synthesized under hydrothermal conditions: [Cu(phen)2]2{[Cu(phen)]2 [SiMo12O40(VO)2]} (1), {[Zn(phen)2]2[GeMo12O40(VO)2]}{[Zn(phen)2(H2O)]2 [GeMo12O40(VO)2]}·3H2O (2) and {[Co(phen)2]2[PMo12O40(VO)2]}{[Co(phen)2(OH)]2 [PMo12O40(VO)2]}·2.5H2O (3) (phen=1,10-phenanthroline). These three compounds present, as building blocks, the bicapped Keggin anions [XMo12O40(VO)2] (X=Si, Ge and P). Compound 1 consists of a bicapped Keggin anion [SiMo12O40(VO)2]2− linked to two [Cu(phen)]+ complexes with two [Cu(phen)2]+ countercations. Compound 2 contains two bicapped Keggin anions [GeMo12O40(VO)2]4−, one…

Robust Allocation Rules in Dynamical Cooperative TU Games

2011

Robust dynamic coalitional TU games are repeated TU games where the values of the coalitions are unknown but bounded variables. We set up the game supposing that the Game Designer uses a vague measure of the extra reward that each coalition has received up to the current time to re-adjust the allocations among the players. As main result, we provide a constructive method for designing allocation rules that converge to the core of the average game. Both the set up and the solution approach also provide an insight on commonalities between coalitional games and stability theory.

Multidomain BEM for crack analysis in stiffened anisotropic plates.

2014

The present paper is concerned with the application of a boundary element model for the analysis of cracks in stiffened composite panels. The panel stiffeners are reduced to equivalent strips and the multidomain technique is used to model panel zones presenting different properties (skin and stiffeners equivalent strip). Also the crack is modeled exploiting the multidomain formulation. Evaluation of stress intensity factors is performed for representative problems.

Comparison of various CI treatments for the description of potential curves for the lowest three states of O2

1972

Abstract Various ab initio CI treatments are reported for the 3 Σ − g , 1 Δ g and 1 Σ + g states of O 2 with particular emphasis on the agreement obtained between calculated and experimental results for binding energies and bond distances of these species and also for transition energies between them. The utility of off-center s and p gaussians in describing the bonding process is stressed and the possibility of optimizing the configurations used in the calculations at each internuclear distance is considered.

Analysis of the Legal and Regulatory Situation of Uncovered Corporate Bond Issuance in the Baltic States: is there a Common Framework Possible?

2021

While the development of the Baltic corporate bond market is based on the uncovered bond segment, the elaboration of the legislative base has a devoted emphasis on the covered bonds. The shift from a country-focused to the pan-Baltic-focused capital market has been publicly acknowledged by the governments (Ministry of Finance of the Republic of Latvia, 2018) and is in line with the ongoing Capital Markets Union initiative of the European Commission (The High Level Forum on the Capital Markets, 2020). Moreover, a pan-Baltic covered bond legal and regulatory framework has been initiated (Ministry of Finance of the Republic of Lithuania, 2019). The strong demand for the corporate bond segment …

Legal framework for secured corporate bonds in Latvia: proposal for a new regulation introducing the concept of a collateral agent

2019

Access to finance is considered as one of the key factors to successful financial market development. European companies face problems with corporate funding which is treated as one of the main barriers to corporate growth and innovation capacity. Corporate bonds represent an alternative source of funding, contributing to a reduction of dependency on more traditional bank financing. Despite the present growth of the corporate bond market in Latvia, the current legal environment for collateralization of the corporate bond in Latvia remains comparatively inflexible for the changes ongoing. The goal of this thesis is to provide a theoretical background for the procedure of issuance of secured …

Design of neutral Lewis superacids of group 13 elements.

2011

A general approach toward superstrong neutral Lewis acids, featuring both the pyramidalization of acceptor molecules and the introduction of electron-withdrawing substituents, is proposed and examined theoretically. Complexes of group 13 element derivatives with ammonia at the B3LYP and MP2 levels of theory with def2-TZVPP basis set are considered as examples. Pyramidalization of the acceptor molecule significantly increases its Lewis acidity (by 50-60 kJ mol(-1) for aluminum and gallium compounds and by 120-130 kJ mol(-1) for boron compounds). An additional increase of the complex stability of 55-75 kJ mol(-1) may be achieved by fluorination. The combined increase of the bond dissociation …

Probing the bond order wave phase transitions of the ionic Hubbard model by superlattice modulation spectroscopy

2017

An exotic phase, the bond order wave, characterized by the spontaneous dimerization of the hopping, has been predicted to exist sandwiched between the band and Mott insulators in systems described by the ionic Hubbard model. Despite growing theoretical evidences, this phase still evades experimental detection. Given the recent realization of the ionic Hubbard model in ultracold atomic gases, we propose here to detect the bond order wave using superlattice modulation spectroscopy. We demonstrate, with the help of time-dependent density-matrix renormalization group and bosonization, that this spectroscopic approach reveals characteristics of both the Ising and Kosterlitz-Thouless transitions …