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Wyszukujesz frazę "Ramírez, M." wg kryterium: Autor

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    Wyświetlanie 1-12 z 12
    Tytuł:
    Exponential estimates of a class of time-delay nonlinear systems with convex representations
    Autorzy:
    Ramírez, M.
    Villafuerte, R.
    González, T.
    Bernal, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/330293.pdf
    Data publikacji:
    2015
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    exponential estimate
    time delay system
    TS model
    guaranteed cost
    convex representation
    funkcja wykładnicza
    układ z opóźnieniem
    koszt gwarantowany
    Opis:
    This work introduces a novel approach to stability and stabilization of nonlinear systems with delayed multivariable inputs; it provides exponential estimates as well as a guaranteed cost of the system solutions. The result is based on an exact convex representation of the nonlinear system which allows a Lyapunov–Krasovskii functional to be applied in order to obtain sufficient conditions in the form of linear matrix inequalities. These are efficiently solved via convex optimization techniques. A real-time implementation of the developed approach on the twin rotor MIMO system is included.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2015, 25, 4; 815-826
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An Uncertainty Model Of Approximating The Analytical Solution To The Real Case In The Field Of Stress Prediction
    Autorzy:
    Gutiérrez, R.
    Ramírez, M.
    Olmeda, E.
    Díaz, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/220703.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    uncertainty
    strain gage measurement
    stress concentration factor
    weighted least squares algorithm
    Opis:
    Deterministic mechanics has been extensively used by engineers as they needed models that could predict the behavior of designed structures and components. However, modern engineering is now shifting to a new approach where the uncertainty analysis of the model inputs enables to obtain more accurate results. This paper presents an application of this new approach in the field of the stress analysis. In this case, a two-dimensional stress elasticity model is compared with the experimental stress results of five different size tubes measured with resistive strain gages. Theoretical and experimental uncertainties have been calculated by means of the Monte Carlo method and a weighted least square algorithm, respectively. The paper proposes that the analytical engineering models have to integrate an uncertainty component considering the uncertainties of the input data and phenomena observed during the test, that are difficult to adapt in the analytical model. The prediction will be thus improved, the theoretical result being much closer to the real case.
    Źródło:
    Metrology and Measurement Systems; 2015, 22, 3; 429-442
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Gully erosion control and carbon sequestration through filter dams in three different land uses
    Autorzy:
    Andrade-Limas, E.
    Espinosa-Ramírez, M.
    Ruiz-Sinoga, J. D.
    Romero-Díaz, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/294707.pdf
    Data publikacji:
    2011
    Wydawca:
    Stowarzyszenie Geomorfologów Polskich
    Tematy:
    carbon sequestration
    filter dams
    gullies
    land uses
    Tamulipas
    Mexico
    Opis:
    The object of this study was to compare and quantify carbon sequestration and erosion control in two type soil and three land uses. Direct measurements of sediment retained in dams with mesh and branches have been taken. In conclusion it may indicate that these dams are an efficient filter control on gully erosion, which is higher in cropland. The capture of organic carbon was higher in natural vegetation due to higher content of organic matter in soil.
    Źródło:
    Landform Analysis; 2011, 17; 87-89
    1429-799X
    Pojawia się w:
    Landform Analysis
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Multi-scale simulation of hybrid silicon nano-electromechanical (NEM) information systems
    Autorzy:
    Mizuta, H.
    Ramirez, M. A. G.
    Tsuchiya, Y.
    Nagami, T.
    Sawai, S.
    Oda, S.
    Okamoto, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/384267.pdf
    Data publikacji:
    2009
    Wydawca:
    Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
    Tematy:
    multi-scale simulation
    NEMS
    suspended gate
    non-volatile memory
    phonon
    Opis:
    This paper presents emerging NEM hybrid systems for advanced information processing and describes our recent attempts of developing new multi-physics simulation technologies for these NEM systems at micro-, nano- and atomscales.
    Źródło:
    Journal of Automation Mobile Robotics and Intelligent Systems; 2009, 3, 4; 58-61
    1897-8649
    2080-2145
    Pojawia się w:
    Journal of Automation Mobile Robotics and Intelligent Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Capture efficiency of magnetically labeled particles traveling through an intracranial aneurysm
    Autorzy:
    Cardona, M.
    Ramírez, J.
    Benavides-Moran, A. G.
    Powiązania:
    https://bibliotekanauki.pl/articles/1839903.pdf
    Data publikacji:
    2021
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    magnetohydrodynamika
    dynamika płynów
    śródbłonek
    endothelization
    particle manipulation
    computational fluid dynamics
    magnetohydrodynamics
    Opis:
    Cell manipulation using external magnetic fields has been proposed to accelerate the neck reendothelization of saccular unruptured stented intracranial aneurysms. This work presents a computational fluid dynamics (CFD) model of a Saccular Brain Aneurysm that incorporates a helicoidal stent. An Eulerian-Lagrangian model implemented in ANSYS-Fluent is used to simulate the hemodynamics in the aneurysm. In silico studies have been conducted to describe the incidence of the magnetic field direction, frequency and amplitude on the blood hemodynamics and particle capture efficiency, when an external magnetic field is used to trap magnetically labeled particles traveling through the aneurysm. It is found that the magnetic field direction affects the particle concentration in the target region. Simulation results show that the highest particle capture efficiency is obtained with a 1T magnetic field amplitude in an open bore MRI scanner, when a permanent magnet is used.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2021, 26, 1; 65-75
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Testing mechanical properties of food powders in two laboratories - degree of consistency of results
    Autorzy:
    Molenda, M.
    Stasiak, M.
    Moya, M.
    Ramirez, A.
    Horabik, J.
    Ayuga, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/25428.pdf
    Data publikacji:
    2006
    Wydawca:
    Polska Akademia Nauk. Instytut Agrofizyki PAN
    Tematy:
    food powder
    testing
    granular material
    consistency degree
    direct shear test
    uniaxial test
    mechanical property
    strength parameter
    elastic parameter
    triaxial test
    Źródło:
    International Agrophysics; 2006, 20, 1
    0236-8722
    Pojawia się w:
    International Agrophysics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Average nutrient and chlorophyll distributions in the Western Mediterranean: RADMED project
    Autorzy:
    Garcia-Martinez, M.C.
    Vargaz-Yanez, M.
    Moya, F.
    Santiago, R.
    Munoz, M.
    Reul, A.
    Ramirez, T.
    Balbin, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/48926.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    climate change
    water column
    nutrient concentration
    nutrient transport
    chlorophyll
    Mediterranean Sea
    RADMED project
    Źródło:
    Oceanologia; 2019, 61, 1
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Spectrally tunable light source based on light-emitting diodes for custom lighting solutions
    Autorzy:
    Burgos-Fernandez, F. J.
    Vilaseca, M.
    Perales, E.
    Herrera-Ramirez, J. A.
    Martinez-Verdu, F. M.
    Pujol, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/173803.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    solid state lighting
    light-emitting diodes
    CIE standard illuminants
    minimization algorithm
    customized lighting design
    radiometry
    Opis:
    This study describes a novel spectral LED-based tunable light source used for customized lighting solutions, especially for the reconstruction of CIE (Commission Internationale de l'Eclairage) standard illuminants. The light source comprises 31 spectral bands ranging from 400 to 700 nm, an integrating cube and a control board with a 16-bit resolution. A minimization algorithm to calculate the weighting values for each channel was applied to reproduce illuminants with precision. The differences in spectral fitting and colorimetric parameters showed that the reconstructed spectra were comparable to the standard, especially for the D65, D50, A and E illuminants. Accurate results were also obtained for illuminants with narrow peaks such as fluorescents (F2 and F11) and a high-pressure sodium lamp (HP1). In conclusion, the developed spectral LED-based light source and the minimization algorithm are able to reproduce any CIE standard illuminants with a high spectral and colorimetric accuracy able to advance available custom lighting systems useful in the industry and other fields such as museum lighting.
    Źródło:
    Optica Applicata; 2016, 46, 1; 117-129
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Cryogenic treatment and PVD coatings to augment wear resistance of tool steels
    Zastosowanie obróbki kriogenicznej i powłok PVD do zwiększenia odporności na ścieranie stali narzędziowych
    Autorzy:
    Peña-Parás, L.
    Trejo Montemayor, L. A.
    Ramírez Cantú, S.
    Fernández Corona, R. D.
    Reyna Reyes, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/190739.pdf
    Data publikacji:
    2013
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    PVD coatings
    tool steels
    cryogenic treatment
    powłoki PVD
    stale narzędziowe
    obróbka kriogeniczna
    Opis:
    The influence of deep cryogenic treatment and PVD coatings on the wear resistance and toughness of D2, S7, H13 and M4 tool steels were studied. Three different PVD coatings were applied after heat treatment: AlCrN, TiAlN, TiCrN. In order to research the wear resistance, the ball-on-disk tribological test was used per ASTM G-99; material toughness was evaluated through the Charpy-V test. Wear scars were examined through optical microscopy to calculate the volume loss. It is found that cryogenic treatment improved wear resistance and toughness up to 63% and 12% respectively. The material with the best combination of wear resistance properties and toughness was S7 with cryogenic treatment and TiAlN coating.
    W pracy przedstawiono wyniki badań wpływu obróbki kriogenicznej i powłok PVD na odporność na ścieranie oraz udarność stali narzędziowych D2, S7, H13 i M4. Zastosowano trzy różne powłoki PVD: AlCrN, TiAlN, TiCrN, które wcześniej poddano obróbce cieplnej. W celu zbadania odporności na zużycie przeprowadzono badania z użyciem testera kula-tarcza zgodnie z wymogami normy ASTM G-99. Udarność została oceniona z wykorzystaniem młota Charpy’ego. Zużycie objętościowe zostało zmierzone za pomocą mikroskopu optycznego. Stwierdzono, że obróbka kriogeniczna polepszyła odporność na ścieranie o 63%, a udarność o 12%. W wyniku przeprowadzonych badań stwierdzono, że materiałem o najlepszych właściwościach na ścieranie i udarność jest stal narzędziowa S7 poddana obróbce kriogenicznej i pokryta powłoką TiAlN.
    Źródło:
    Tribologia; 2013, 3; 109-117
    0208-7774
    Pojawia się w:
    Tribologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Diagnostic performance of loop-mediated isothermal amplification (LAMP) and Ultra-sensitive PCR in diagnosis of malaria in western Saudi Arabia
    Autorzy:
    Solimam, Rasha H.
    Martin-Ramirez, Alexandra
    Rubio, Jose M.
    Khalifa, Eman A.
    Hussein, Bushra E.
    Wahab, Maha M.
    Lanza, Marta
    Hawash, Yousry A.
    Powiązania:
    https://bibliotekanauki.pl/articles/51992733.pdf
    Data publikacji:
    2023
    Wydawca:
    Uniwersytet Jagielloński. Wydawnictwo Uniwersytetu Jagiellońskiego
    Tematy:
    malaria
    LAMP
    ultrasensitive PCR
    diagnosis
    Opis:
    Malaria diagnosis continues to be one of the most important steps in the cycle of control specially in endemic countries with low parasitic load infections. Loop-mediated isothermal amplification (LAMP) and ultrasensitive PCR (Us-PCR) are two promising candidates for malaria diagnosis. A cross sectional study performed at King Faisal Hospital, Taif KSA involved patients suffering from signs and symptoms suggesting of malaria, 35 blood samples diagnosed by Nested Multiplex PCR as a reference method (13 P. falciparum, 17 P. vivax, 3 mixed P. falciparum and P. vivax) plus two negative controls were selected to be included in this study to analyse the performance of two LAMP methods (LAMP OptiGene® and LAMP WarmStart®) and two ultrasensitive PCRs (Us-PCR TARE-2 and Us-PCR Var-ATS). LAMP OptiGene® and LAMP WarmStart® performances were identical and better than the performance of Us PCR TARE 2 and Us-PCR var-ATS for P. falciparum, achieving 93.75% sensitivity, 100% specificity and 97.17% accuracy versus 87.5% sensitivity, 100% specificity and 94.29% accuracy for the Us PCR TARE 2 and 81.25% sensitivity, 94.74% specificity and 88.57% accuracy for the Us PCR var-ATS respectively. In P. vivax diagnosis LAMP OptiGene® performed excellently with 100% sensitivity, specificity, and accuracy while LAMP WarmStart® and Us-PCR Cox1 achieved 100% sensitivity, specificity 93.33% and 97.14% accuracy. The study results highlighted the benefits of using LAMP techniques for field diagnosis of malaria in different settings where the need for a more sensitive and reliable molecular tool is mandatory but at the same time removing the high cost, long turnaround time and the need of highly specialized trained technicians to perform more sophisticated molecular techniques.
    Źródło:
    Acta Protozoologica; 2023, 62; 15-23
    0065-1583
    1689-0027
    Pojawia się w:
    Acta Protozoologica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Computationally-Efficient Design of a Dynamic System-Level LTE Simulator
    Autorzy:
    Munoz, P.
    Bandera, I. de la
    Ruiz, F.
    Luna-Ramirez, S.
    Barco, R.
    Toril, M.
    Lázaro, P.
    Rodriguez, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/226262.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    LTE
    simulator
    RRM
    network
    link-level
    system-level
    E-UTRAN
    Opis:
    The Long-Term Evolution (LTE) is the next generation of current mobile telecommunication networks. LTE has a new flat radio-network architecture and a significant increase in spectrum efficiency. In this paper, a computationally-efficient tool for dynamic system-level LTE simulations is proposed. A physical layer abstraction is performed to predict link-layer performance with a low computational cost. At link layer, there are two important functions designed to increase the network capacity: Link Adaptation and Dynamic Scheduling. Other Radio Resource Management functionalities such as Admission Control and Mobility Management are performed at network layer. The simulator is conceived for large simulated network time to allow evaluation of optimization algorithms for the main network-level functionalities.
    Źródło:
    International Journal of Electronics and Telecommunications; 2011, 57, 3; 347-358
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Remediation of polluted waters and wastewater by radiation processing
    Autorzy:
    Sampa, M. H. O.
    Takács, E.
    Gehringer, P.
    Rela, P. R.
    Ramirez, T.
    Amro, H.
    Trojanowicz, M.
    Botelho, M. L.
    Han, B.
    Solpan, D.
    Cooper, W. J.
    Emmi, S. S.
    Wojnárovits, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/147644.pdf
    Data publikacji:
    2007
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    electron beam
    wastewater treatment
    pesticides
    dyes
    degradation
    radiation technology
    Opis:
    Application of radiation processing for drinking water, wastewater, and groundwater treatment is a cost effective process which may insure adequate availability of that resource worldwide. This paper summarizes the results of a Coordinated Research Project (organized by the IAEA) with participants from 10 countries with the purpose of describing the degradation mechanism of organic impurities, and establishing optimal treatment conditions. Decoloration, disinfection, microbiological and toxicological experiments are also mentioned. These experiments led to pilot plants and also to a large scale industrial realization of radiation technology.
    Źródło:
    Nukleonika; 2007, 52, 4; 137-144
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-12 z 12

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