Results 121 to 130 of about 29,252 (164)
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Aircraft positioning using PPP method in GLONASS system
Aircraft Engineering and Aerospace Technology, 2018Purpose The purpose of the study is focused on implementation of Global Navigation Satellite System (GLONASS) technique in civil aviation for recovery of aircraft position using Precise Point Positioning (PPP) method in kinematic mode. Design/methodology/approach The aircraft coordinates of Cessna 172 plane in XYZ geocentric frame were obtained ...
Kamil Krasuski
exaly +2 more sources
Halochromic effects of azophthalimide dyes and their prediction by PPP method
Dyes and Pigments, 1996Abstract The spectra of azo dye derivatives of 3- and 4-aminophthalimide and their N-methyl derivatives in neutral and acid media have been recorded. The overall basicity constants (p K ) have been determined by UV-VIS spectrophotometry. The values of these constants have been compared with those determined for simple derivatives of aminoazobenzene ...
Krzysztof Wojciechowski
exaly +2 more sources
Investigation of accuracy of PPP and PPP-AR methods for direct georeferencing in UAV photogrammetry
Earth Science Informatics, 2022Traditionally, photogrammetric product accuracy at cm level is obtained with Ground Control Points (GCP) in UAV photogrammetry. In recent years, UAVs equipped with Post-Processing Kinematic & Real-Time Kinematic (PPK/RTK) have become widespread. Accuracy in cm-level can be obtained with relative/differential positioning with these equipment.
Taylan Ocalan +3 more
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PPP Performance with Large TEC Gradient and Mitigation Methods
2020 European Navigation Conference (ENC), 2020During high-level solar activity time, frequent ionospheric irregularities lead to large total electron content (TEC) gradient. precise point positioning (PPP) performance can be significantly degraded under the unfavorable ionosphere conditions. We analyze the causes and effects of the ionosphere potential impacts on uncombined PPP (UPPP) performance ...
Yan Xiang +3 more
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PPP as an alternative procurement method for corporates
22nd Annual European Real Estate Society Conference, 2015Real estate, mainly being workspace, is an important resource for non-property companies and their core business processes, and ultimately influences productivity. Procurement of such real estate as well as servicing and maintaining it, incurs extensive capital and operating costs, which in turn have a significant impact on the company's performance ...
Andreas Pfnür +2 more
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Positioning performance of GNSS-PPP and PPP-AR methods for determining the vertical displacements
Survey Review, 2021This study investigates the accuracy of vertical displacements monitored by Global Navigation Satellite Systems (GNSS) precise point positioning (PPP) with float-ambiguity solution and with ambiguity resolution (PPP-AR). For this purpose, a simulation was designed. The static GNSS observations were collected at a test point during different observation
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A mild and efficient method to prepare oligophenylenes (PPPs)
European Polymer Journal, 2018Abstract In the present work we developed a practical, faster, and more sustainable way to prepare conjugated materials, derived from poly-p-phenylenes (PPPs), using 10% palladium on carbon as catalyst and distilled water as solvent under microwave heating for 3 h.
Rebeca Rocha Rodrigues +2 more
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A new method to avoid PPP in data evaluation
Chinese Physics, 2004The Peelle Pertinent Puzzle (PPP) has been studied systematically. The results obtained by using several proposed methods to deal with a sample of 6Li(n,t) are compared with each other. The cause of PPP occurrence has been found. A new method to avoid PPP is introduced, whose main idea is `to selectively make suitable correction for systematic error ...
Chen Zhen-Peng, Sun Ye-Ying
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Graph theory and the PPP method
Journal of Mathematical Chemistry, 1991A graph theoretical formulation of the PPP method is presented. A weighted adjacency matrix of the PPP graph is given, wherein the off-diagonal elements are the bond orders. The automorphism group of the PPP graph is defined and shown to be isomorphic with the permutational subgroup of the permutation-inversion group of the molecule. It is demonstrated
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An excitonic method based on PPP Hamiltonian: application to the dimerization of polyenes
Synthetic Metals, 1999Abstract Starting from the Pariser-Parr-Pople Hamiltonian, we have proposed an effective Hamiltonian based on a local description of a conjugated polymer in terms of monomers. The model is adapted to the description of the ground and low energy excited states.
Pleutin, S., Fave, J.
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