Practical Low-Cost Recovery of Spectral Power Distributions

2015 ◽  
Vol 35 (1) ◽  
pp. 166-178 ◽  
Author(s):  
Sara Alvarez-Cortes ◽  
Timo Kunkel ◽  
Belen Masia
Keyword(s):  
Spectral Power ◽  
Low Cost ◽  
Cost Recovery

scholarly journals Non-empirical, low-cost recovery of exact conditions with model-Hamiltonian inspired expressions in jmDFT

2019 ◽  
Vol 150 (15) ◽  
pp. 154115 ◽  
Author(s):  
Akash Bajaj ◽  
Fang Liu ◽  
Heather J. Kulik
Keyword(s):  
Low Cost ◽  
Cost Recovery ◽  
Model Hamiltonian

scholarly journals A Crowd Monitoring Methodology based on the Analysis of the Electromagnetic Spectrum

2021 ◽  
pp. 39-47
Author(s):  
Massimo Donelli ◽  
Giuseppe Espa
Keyword(s):  
Mobile Phone ◽  
Frequency Band ◽  
Spectral Power ◽  
Low Cost ◽  
Least Square Method ◽  
Spectral Power Density ◽  
Least Square ◽  
Electromagnetic Spectrum ◽  
Number Of Customers ◽  
Linear Regression Estimator

In this work, a system able to monitor the crowd density detecting mobile phone communications through the analysis of the electromagnetic spectrum is proposed and experimentally assessed. The variations of the electromagnetic spectrum are collected with a low-cost spectrum analyzer, and a high gain log-periodic directive antenna (LPDA). The objective is to relate the spectral power density in a given frequency band to estimate the connections present and the number of people in a given area. In particular, a linear regression estimator, whose parameters have been calculated with the least square method modeled considering experimental data in a controlled environment, permits us to infer the number of customers detected on a given frequency band. The obtained experimental results demonstrated the efficacy of the method, which can be used not only to monitoring the number of people in a given scenario, but it also be used for commercial activities to detect the presence and pervasiveness of different mobile phone companies.

scholarly journals Una nota sobre la recuperación de costes de los servicios del agua en la cuenca del Gállego

2011 ◽  
Vol 7 (13) ◽  
pp. 49 ◽  
Author(s):  
Luis Pérez y Pérez ◽  
Jesús Barreiro Hurlé
Keyword(s):  
Water Management ◽  
Low Cost ◽  
Public Capital ◽  
Cost Recovery ◽  
Water Services ◽  
The Public ◽  
Full Cost ◽  
Sustainable Water Use ◽  
Full Cost Recovery

Up to date, water management in Spain has been focused on supply approaches, with the result of providing consumers with this resource at a low price. Developments in the institutional framework regulating water management in the European context (mainly the implementation of the Water Framework Directive) have shifted this approach in order to promote sustainable water use. To achieve this objective, tariff policy must now take into account the water services cost-recovery principle for its different uses. Within this context, this paper estimates the public capital stock related to water supply and assesses the existing level of cost-recovery related to that stock. The methodology used, compares the tax level needed for full-cost recovery with actual revenues from different water-related taxes. The case study area is Gallego River basin in Aragon, and results show the low cost- recovery level for most water services.

scholarly journals A low-cost recovery scheme for dynamically scheduled processors

2008 ◽  
Vol 5 (22) ◽  
pp. 927-931
Author(s):  
Min Choi ◽  
Seungryoul Maeng
Keyword(s):  
Low Cost ◽  
Cost Recovery ◽  
Recovery Scheme

Low Cost Recovery Optimization of Mature Onshore Sour Gas and Gas Condensate Assets

2019 ◽  
Author(s):  
Matthias Maierhofer ◽  
Johannes Pamminger ◽  
Andreas Ecklmair ◽  
Markus Schuster ◽  
Justin Lamar ◽  
...  
Keyword(s):  
Low Cost ◽  
Gas Condensate ◽  
Cost Recovery ◽  
Sour Gas

scholarly journals Determination of Flux Density of the Solar Radio Burst Event by Using Log Periodic Dipole Antenna (LPDA)

2014 ◽  
Vol 26 ◽  
pp. 21-29 ◽  
Author(s):  
Zety Sharizat Hamidi ◽  
N.N.M. Shariff
Keyword(s):  
Flux Density ◽  
Radio Burst ◽  
Solar Radio ◽  
Spectral Power ◽  
Low Cost ◽  
Low Frequency ◽  
Dipole Antenna ◽  
Solar Radio Burst ◽  
Isotropic Source ◽  
Space Agency

In this article, an evaluation of the flux density of the solar radio burst is presented. A rod aluminium’s type as a conductor with nineteenth (19) elements of different sizes is being prepared to construct a log periodic dipole antenna (LPDA) from 45-870 MHz. The performance was carried out at the National Space Agency (PAN), Sg. Lang, Banting Selangor by connecting to the Compound Low Cost Low Frequency Spectroscopy Transportable Observatory (CALLISTO) spectrometer. The input impedance, R0 = 50 ohm is chosen for this LPDA antenna. From the analysis, the gain of the antenna is 9.3 dB. This antenna potentially captures a signal that covers about 0.08 m2 area of the Sun.The temperature of the burst that detected at the feedpoint of the antenna is 32 K. However, the signal becomes decrease to 28.75 K while by CALLISTO spectrometer as a receiver. It was also found that the isotropic source spectral power is 1576 W/Hz. Since the burst level above the background sky is 0.41 dB , the flux density of the burst is 5.5 x 10-21 W/m2/Hz. Based on the results, we conclude that this antenna is suitable for to observe the Sun activities at low frequency region.

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