The Experts below are selected from a list of 33 Experts worldwide ranked by ideXlab platform

Tiziana Laureti - One of the best experts on this subject based on the ideXlab platform.

  • Working group on survey frameworks : are integration and comparison between CPIs and PPs feasible?
    2010
    Co-Authors: Luigi Biggeri, Tiziana Laureti
    Abstract:

    The integration and comparison between the Consumer Price Indices (CPIs) and the Purchasing Power Parities (PPPs) has been widely discussed in literature and the need of a more integrated approach for calculating these indices has been emphasized. The paper focuses on these issues, both from a theoretical and practical point of view, suggesting the use of a broader definition of the comparability of products for the PPP Calculation and a simple statistical method for investigating the advantages of broadening the definition of comparability to include additional products in the PPP Calculation.

  • Are Integration and Comparison Between CPIs and PPPs Feasible
    Contributions to Statistics, 2009
    Co-Authors: Luigi Biggeri, Tiziana Laureti
    Abstract:

    The integration and comparison between the Consumer Price Indices (CPIs) and the Purchasing Power Parities (PPPs) has been widely discussed in literature and the need of a more integrated approach for calculating these indices has been emphasized. The paper focuses on these issues, both from a theoretical and practical point of view, suggesting the use of a broader definition of the comparability of products for the PPP Calculation and a simple statistical method for investigating the advantages of broadening the definition of comparability to include additional products in the PPP Calculation.

Luigi Biggeri - One of the best experts on this subject based on the ideXlab platform.

  • Working group on survey frameworks : are integration and comparison between CPIs and PPs feasible?
    2010
    Co-Authors: Luigi Biggeri, Tiziana Laureti
    Abstract:

    The integration and comparison between the Consumer Price Indices (CPIs) and the Purchasing Power Parities (PPPs) has been widely discussed in literature and the need of a more integrated approach for calculating these indices has been emphasized. The paper focuses on these issues, both from a theoretical and practical point of view, suggesting the use of a broader definition of the comparability of products for the PPP Calculation and a simple statistical method for investigating the advantages of broadening the definition of comparability to include additional products in the PPP Calculation.

  • Are Integration and Comparison Between CPIs and PPPs Feasible
    Contributions to Statistics, 2009
    Co-Authors: Luigi Biggeri, Tiziana Laureti
    Abstract:

    The integration and comparison between the Consumer Price Indices (CPIs) and the Purchasing Power Parities (PPPs) has been widely discussed in literature and the need of a more integrated approach for calculating these indices has been emphasized. The paper focuses on these issues, both from a theoretical and practical point of view, suggesting the use of a broader definition of the comparability of products for the PPP Calculation and a simple statistical method for investigating the advantages of broadening the definition of comparability to include additional products in the PPP Calculation.

Sumio Tokita - One of the best experts on this subject based on the ideXlab platform.

  • ms windows application for a PPP Calculation using the novel two center electron repulsion integral
    Molecular Crystals and Liquid Crystals, 2000
    Co-Authors: Fumio Noguchi, Nobuki Hanaoka, Kimihiro Hiruta, Tatsuya Tachikawa, Kichisuke Nishimoto, Sumio Tokita
    Abstract:

    Abstract The application of Windows 95/98/NT for PPP MO (Pariser-Parr-Pople molecular orbital) Calculation was developed by using the Inprise C++ builder. The novel two-center electron repulsion integral (new-γ), the concept of spectrochemical softness parameter krs for PPP Calculation, was introduced in this application. The user can perform quickly the modeling of π-conjugated compounds on a PC monitor and select many suitable parameters (for example, ionization potentials, resonance integrals etc.) for the PPP Calculation. The SCF Calculation was momentarily performed and oscillator strength and LCAO coefficients of HOMO, LUMO or others were displayed. The Calculations gave satisfactory results for the prediction of the electronic absorption spectra of polycyclic aromatic hydrocarbons(PAHs), symmetric cyanins and so on.

Geraldo Magela E Silva - One of the best experts on this subject based on the ideXlab platform.

  • Linking model Hamiltonians to ab initio and semiempirical methods in descriptions of impurities in conjugated polymers
    International Journal of Quantum Chemistry, 2005
    Co-Authors: Alessandra F. A. Vilela, Ricardo Gargano, Geraldo Magela E Silva
    Abstract:

    Semiempirical and ab initio electronic structure and model Hamiltonian Calculations of the undoped and doped polyacetylene (PA) chain are presented. As a general model Hamiltonian we use the Su–Schrieffer–Heeger (SSH) model combined with the Pariser–Parr–Pople (PPP) model with site-type impurities. More precisely, band gap and charge distributions of a single conducting PA chain bonding with several atomic and molecular radicals as impurities were investigated. From a comparison between the electronic and SSH-PPP Calculation it was possible to determine what impurity actually corresponds to the charge distribution obtained with model Calculations. Therefore, it is shown within the present results what impurities are being represented in model Calculations. This correspondence is fundamental in determining the behavior of molecular circuits and molecular devices. © 2005 Wiley Periodicals, Inc. Int J Quantum Chem, 2005

Dawei Zhang - One of the best experts on this subject based on the ideXlab platform.

  • Electronic structures of low-lying Bu excited states in trans-oligoenes: Pariser-Parr-Pople and ab initio Calculations
    Journal of Chemical Physics, 2011
    Co-Authors: Dawei Zhang
    Abstract:

    Two lowest-lying excited singlets with Bu symmetry of all-trans-oligoenes, the well-known ionic 11Bu+ state as well as the “hidden” ionic-covalent-mixed 11Bu− state, are calculated within both the Pariser-Parr-Pople (PPP) model at full configuration interaction (FCI) level and ab initio methods. The vertical excitation energies as well as wavefunctions from PPP-FCI Calculations are found to be in good agreement with those from high-level multi-reference methods, such as multi-reference complete active space self-consistent field (CASSCF) with second order perturbative corrections (CASPT2), multi-reference Moller-Plesset perturbation theory (MRMP), and complete active space valence bond theory (CASVB). The oscillator strengths from PPP Calculation are in good agreement with spectroscopy experiments. The relatively small oscillator strength of 11Bu− is due to the approximate electron-hole symmetry of this state. In addition, the bond lengths in both states are found to show remarkable relativity with the bo...