Autor: Ramos, P. M. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: DSPIC - Based impedance measuring instrument
Autorzy:: Santos, J.
Ramos, P. M.
Powiązania:: https://bibliotekanauki.pl/articles/220477.pdf
Data publikacji:: 2011
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: impedance measurement
dsPIC
ADC
sine-fitting
Opis:: An implemented impedance measuring instrument is described in this paper. The device uses a dsPIC (Digital Signal Peripheral Interface Controller) as a processing unit, and a DDS (Direct Digital Synthesizer) to stimulate the measurement circuit composed by the reference impedance and the unknown impedance. The voltages across the impedances are amplified by programmable gain instrumentation amplifiers and then digitized by analog to digital converters. The impedance is measured by applying a seven-parameter sine-fitting algorithm to estimate the sine signal parameters. The dsPIC communicates through RS-232 or USB with a computer, where the measurement results can be analyzed. The device also has an LCD to display the measurement results.
Źródło:: Metrology and Measurement Systems; 2011, 18, 2; 185-198
0860-8229
Pojawia się w:: Metrology and Measurement Systems
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Skocz do pozycji: 2.

Tytuł:: Real Time PC Implementation of Power Quality Monitoring System Based on Multiharmonic Least-Squares Fitting
Autorzy:: Ardeleanu, A. S.
Ramos, P. M.
Powiązania:: https://bibliotekanauki.pl/articles/220586.pdf
Data publikacji:: 2011
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: power quality
real time
multiharmonic least-squares fitting
Opis:: In this paper, an algorithm that monitors the power system to detect and classify power quality events in real time is presented. The algorithm is able to detect events caused by waveform distortions and variations of the RMS values of the voltage. Detection of the RMS events is done by comparing the RMS values with certain thresholds, while detection of waveform distortions is made using an algorithm based on multiharmonic leasts-squares fitting.
Źródło:: Metrology and Measurement Systems; 2011, 18, 4; 543-554
0860-8229
Pojawia się w:: Metrology and Measurement Systems
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Skocz do pozycji: 3.

Tytuł:: On the use of multi-harmonic least-squares fitting for THD estimation in power quality analysis
Autorzy:: Ramos, P. M.
Janeiro, F. M.
Radil, T.
Powiązania:: https://bibliotekanauki.pl/articles/220641.pdf
Data publikacji:: 2012
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: harmonic analysis
power quality
signal reconstruction
spectral analysis
harmonic distortion
Opis:: The quality of the supplied power by electricity utilities is regulated and of concern to the end user. Power quality disturbances include interruptions, sags, swells, transients and harmonic distortion. The instruments used to measure these disturbances have to satisfy minimum requirements set by international standards. In this paper, an analysis of multi-harmonic least-squares fitting algorithms applied to total harmonic distortion (THD) estimation is presented. The results from the different least-squares algorithms are compared with the results from the discrete Fourier transform (DFT) algorithm. The algorithms are assessed in the different testing states required by the standards.
Źródło:: Metrology and Measurement Systems; 2012, 19, 2; 295-306
0860-8229
Pojawia się w:: Metrology and Measurement Systems
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Skocz do pozycji: 4.

Tytuł:: Network for EPR spectroscopic analysis as a tool in didactic process
Autorzy:: Bernaś, M.
Ramos, P.
Powiązania:: https://bibliotekanauki.pl/articles/332960.pdf
Data publikacji:: 2010
Wydawca:: Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
Tematy:: interoperacyjne urządzenia medyczne
zdalne szkolenia
algorytm najmniejszego błędu średniokwadratowego
medical devices interoperability
remote training
LMS
Opis:: The paper deals with a new training technologies' development based on distance learning web–services, implemented for laboratory of a Pharmacy Study branch at Medical University in Katowice. The discussed computing interfaces allow students to perform analysis of free radicals' spectra provided by EPR device. These training facilities are now available at home; at their remote terminal. The training resources consist of electronic ⁄ computer based training. The laboratory provide the students with an interface incorporated into simulation packages along with statistic apparatus for data analysis. The dynamically configured application provide the user with his individual set of training samples. Additionally it provides a valuable skill training for students, otherwise available only as part of master ofscience thesis work.
Źródło:: Journal of Medical Informatics & Technologies; 2010, 16; 77-82
1642-6037
Pojawia się w:: Journal of Medical Informatics & Technologies
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Skocz do pozycji: 5.

Tytuł:: Separation of groups of free radicals from noised EPR spectrum using genetic algorithm and gradient method
Autorzy:: Bernas, M.
Ramos, P.
Powiązania:: https://bibliotekanauki.pl/articles/951652.pdf
Data publikacji:: 2013
Wydawca:: Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
Tematy:: signal filtering
genetic algorithms
spectra analysis
free radicals
EPR spectroscopy
function approximation
filtrowanie sygnału
algorytmy genetyczne
analiza widma
wolne rodniki
spektroskopia EPR
aproksymacja funkcji
Opis:: Different groups of free radicals exist in biological material like animal tissues or plants parts. The processes like heating or cooling creates additional types of free radicals groups in this organic matter, due to changes in chemical bonds. The paper proposes a method to determine types and concentrations of different groups of free radicals in the matter processed in various temperatures. The method extracts the spectrum of free radicals using electron paramagnetic resonance with the microwave power of 2.2 mW. Then an automatic method to find a best possible fit using limited number of theoretical mathematical functions is proposed. The match is found using spectrum filtration, and a genetic algorithm implementation supported by a Gradient Method. The obtained results were compared against the samples prepared by an expert. Finally, some remarks were given and new possibilities for future research were proposed.
Źródło:: Journal of Medical Informatics & Technologies; 2013, 22; 117-123
1642-6037
Pojawia się w:: Journal of Medical Informatics & Technologies
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Skocz do pozycji: 6.

Tytuł:: Effect of storage time on microwave saturation of EPR spectra of thermally sterilized streptomycin and its practical applications
Autorzy:: Ramos, P.
Pilawa, B.
Bernaś, M.
Powiązania:: https://bibliotekanauki.pl/articles/333612.pdf
Data publikacji:: 2010
Wydawca:: Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
Tematy:: spektroskopia elektronowego rezonansu paramagnetycznego
nasycenie mikrofalowe
wolne rodniki
streptomycyna
sterylizacja prądu termicznego
EPR spectra
microwave saturation
free radicals
streptomycin
thermal sterilization
Opis:: Electron paramagnetic resonance spectroscopy at X-band (9.3 GHz) is used as the tool of optimalization of storage of thermally sterilized aminoglycoside antibiotic - streptomycin. Thermal sterilization at different conditions was performed according to the norms. Changes in free radicals system of this drug during storage after sterilization were detected. Lineshape analysis and microwave saturation of EPR spectra were done. Free radical concentrations were determined. Microwave saturation EPR analysis is proposed as useful method to determine the best conditions of storage of sterilized drugs.
Źródło:: Journal of Medical Informatics & Technologies; 2010, 15; 185-191
1642-6037
Pojawia się w:: Journal of Medical Informatics & Technologies
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Skocz do pozycji: 7.

Tytuł:: ESR Studies of Paramagnetic Centers in Pharmaceutical Materials - Cefaclor and Clarithromycin as an Example
Autorzy:: Skowronska, A.
Wojciechowski, M.
Ramos, P.
Pilawa, B.
Kruk, D.
Powiązania:: https://bibliotekanauki.pl/articles/1490205.pdf
Data publikacji:: 2012-02
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 87.15.La
87.64.kj
87.64.kh
75.10.Dg
Opis:: Electron spin resonance (ESR) studies of two antibiotics, Cefaclor and Clarithromycin, have been performed in order to investigate concentration and dynamics of free radicals generated in these compounds due to thermal sterilization. For Cefaclor three combinations of temperature and heating time have been applied: 160°C, 170°C, 180°C for 120 min, 60 min, and 30 min, respectively, according to the pharmaceutical sterilization norm. Clarithromycin has been heated at 160°C for 120 min. The ESR lineshape has been investigated versus microwave power ranging from 2.2 mW to 70 mW. Electron spin-spin relaxation time has been estimated from the ESR lineshape analysis. Concentrations of radicals generated due to different sterilization procedures have been compared with the purpose to select the best sterilization scheme.
Źródło:: Acta Physica Polonica A; 2012, 121, 2; 514-517
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Skocz do pozycji: 8.

Tytuł:: Phytochemical potential of Ficus species for the control of the phytonematode Meloidogyne javanica
Autorzy:: Alves, J.R.
De Assis, J.N.
Padua, C.C.A.
Balbino, H.M.
Lima, L.L.
De Souza Gouveia, A.
Vital, C.E.
Buonicontro, D.S.
De Freitas, L.G.
Leite, J.P.V.
De Oliveira Ramos, H.J.
Powiązania:: https://bibliotekanauki.pl/articles/2082765.pdf
Data publikacji:: 2020
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: gas chromatography/mass spectrometry (GC/MS)
metabolite profiling
pest
control
phytochemistry
Opis:: Root-knot nematodes, genus Meloidogyne, are among the most plant damaging pathogens worldwide. The action of natural products against plant pathogens has been investigated to assess their effectiveness in the control of diseases. Thus, the present study aimed to evaluate the phytochemistry potential of the Ficus species for the control of Meloidogyne javanica. In vitro inhibitory activity assays were performed with crude ethanolic extracts of leaves and branches from 10 Ficus species. Among these, Ficus carica extracts exhibited strong paralysis activity against second stage juveniles (J2) (EC50 = 134.90 μg ∙ ml–1 ), after 72 hours. In addition, high efficacy was observed in egg-hatching inhibition at different embryonic stages. Microscopy analysis revealed severe morphological alterations in the nematode tissues at the J2 stage, as well as immotility of juveniles released from eggs in the presence of F. carica extracts. The efficacy of the treatments for the other species was very low. These differences were supported by the variation in the compound classes, mainly for alkaloids and metabolite profiles by Gas Chromatography/Mass Spectrometry (GC/MS) when F. carica was compared with the other species. The results indicated that F. carica is a promising source for the isolation and identification of molecules capable of acting in the control of M. javanica.
Źródło:: Journal of Plant Protection Research; 2020, 60, 2; 193-206
1427-4345
Pojawia się w:: Journal of Plant Protection Research
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Informacja

Wyszukujesz frazę "Ramos, P. M." wg kryterium: Autor

Źródło danych

Dostawca treści

Kolekcja

Rok wydania

Wydawca

Temat

Autor

Typ dokumentu

Język