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Wyszukujesz frazę "Martínez, J. F." wg kryterium: Autor


Wyświetlanie 1-14 z 14
Tytuł:
Three-channel X-ray detection head for diagnostics of plasma in noisy environment
Autorzy:
Ryć, L.
Kaczmarczyk, J.
Martinez, J. F.
Scholz, M.
Słysz, M.
Powiązania:
https://bibliotekanauki.pl/articles/148717.pdf
Data publikacji:
2001
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
high-temperature plasma
semiconductor detector
X-ray diagnostics
Opis:
A compact, three-channel, noise-resistant detection head based on semiconductor detectors has been built for the diagnostics of X-ray emission from plasmas. It is useful in the energy range of 0.5–20 keV.
Źródło:
Nukleonika; 2001, 46, suppl. 1; 95-97
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ultrafast X-ray introspective imaging of metallic objects using a Plasma Focus
Autorzy:
Moreno, C. H.
Clausse, A.
Martínez, J. F.
Llovera, R.
Tartaglione, A.
Powiązania:
https://bibliotekanauki.pl/articles/146595.pdf
Data publikacji:
2001
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
dense plasmas
electrical discharges
plasma focus
X-ray imaging
X-rays
Opis:
A compact-chamber 4.7 kJ, 30 kV, Plasma Focus operated in deuterium was used as a ultrafast high intensity radiation source for introspective radiographic imaging of metallic objects. The samples to be imaged were located outside the Plasma Focus chamber, about 1 m away from the chamber wall. A high-sensitivity, fast-response commercial radiographic film was used as a X-ray detector. Experimentally obtained images are presented showing a very high penetration power of the X-ray beam, demonstrating that the presented compact-chamber Plasma Focus is suited for introspective visualisation of pieces manufactured on metal.
Źródło:
Nukleonika; 2001, 46, suppl. 1; 33-34
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Scale effects on sediment yield from badland areas in Mediterranean environments
Autorzy:
Martínez-Murillo, J. F.
Nadal-Romero, E.
Vanmaercke, M.
Poesen, J.
Powiązania:
https://bibliotekanauki.pl/articles/294681.pdf
Data publikacji:
2011
Wydawca:
Stowarzyszenie Geomorfologów Polskich
Tematy:
badlands
sediment yield
drainage area
spatial scale
Opis:
This study investigates area-specific Sediment Yield (SY) in Mediterranean badland areas at different spatial scales using a SY-database compiled from scientific literature. Relationships between the plot and catchment characteristics and the corresponding SY-data are analyzed. Results indicate that in Mediterranean environments SY is larger than in other environments,especially in badlands where a high variability of SY is observed depending on the spatial scale. In intensively gullied badlands,a complex plot or drainage area (A) -SY relationship is observed: for A ranging between 10-5 and 10 ha,SY is very high (mean SY equals 475 t ha-1 yr-1),whereas for A greater than 10 ha,SY decreases with increasing A (mean SY less than 100 t ha-1 yr-1).
Źródło:
Landform Analysis; 2011, 17; 105-109
1429-799X
Pojawia się w:
Landform Analysis
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modelling the effects of land use changes on runoff and soil erosion in two Mediterranean catchments with active gullies (South of Spain)
Autorzy:
Martínez-Murillo, J. F.
López-Vicente, M.
Poesen, J.
Ruiz-Sinoga, J. D.
Powiązania:
https://bibliotekanauki.pl/articles/294673.pdf
Data publikacji:
2011
Wydawca:
Stowarzyszenie Geomorfologów Polskich
Tematy:
gully erosion
land use
RMMF
model
runoff
soil erosion
Opis:
This study investigates the effects of land use changes between 1956 and 2006 on runoff and soil erosion in two Mediterranean catchments (South Spain)with active gullies, by applying the RMMF Model and by comparing the erosion channel network from both years. Results underline the complexity of soil erosion dynamics in gullied catchments where a general increase in soil erosion due to land use changes can occur simultaneously with a decrease in erosion rates within the gully system.
Źródło:
Landform Analysis; 2011, 17; 99-104
1429-799X
Pojawia się w:
Landform Analysis
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Aerodynamic analysis of wind turbine rotor blades
Autorzy:
Martinez, J.
Doerffer, P.
Szulc, O.
Tejero, F.
Powiązania:
https://bibliotekanauki.pl/articles/1938637.pdf
Data publikacji:
2015
Wydawca:
Politechnika Gdańska
Tematy:
aerodynamics
CFD
NREL Phase VI rotor
wind turbine
Opis:
One of the main achievements of the PLGrid Plus project is the implementation of new tools and services designed for the numerical prediction of the aerodynamic performance of wind energy turbines. An innovative and unique integration tool (Aero-T) is aiming at automating all stages (pre-, solution and post-processing) of the numerical simulation of the flow around wind turbine rotor blades using commercial CFD software based on the RANS approach and block-structured computational grids. The FINE/Turbo package (Numeca Int.) is applied in the structured grid generation process and solution phases, while the analysis of results is left to the Tecplot 360 (Tecplot Inc.) software. A demonstrator based on the NREL Phase VI rotor experiment (conducted at NASA Ames) is introduced to prove the excellent prediction capabilities of Aero-T.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2015, 19, 2; 129-140
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Simulation Tools for Analysis and Design of Distribution Networks with Distributed Energy Resources
Autorzy:
Martinez-Velasco, J. A.
de Leon, F.
Dinavahi, V.
Powiązania:
https://bibliotekanauki.pl/articles/262787.pdf
Data publikacji:
2009
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie
Tematy:
distribution systems
distributed energy resources
distributed generation
simulation
Opis:
Distributed energy resources (DER) are a combination of distributed generation, energy storage and demand-side measures. DER can be used to help utilities solve problems on the distribution system by supporting voltage, reducing losses, providing backup power, improving local power quality7 and reliability, or deferring distribution system upgrade. They present, however, some important drawbacks such as new protection coordination problems, complicated operating procedures, or intermittent nature of renewable sources. All these issues complicate the analysis of distribution systems with a high penetration of DER devices. Required simulation tools must therefore combine analysis and modelling capabilities for representing the various DER technologies accurately. Since distribution systems were not designed for the inclusion of DER, most distribution software packages were not designed for the analysis of systems with embedded generation either. Present software designed for the study of distribution systems can efficiently cope with unbalanced load-flow and short circuit calculations, load growth studies, or system restoration and contingency analysis. However, they do not deal with transient stability and small signal stability because traditionally there was no generation at distribution level. This situation is changing, software manufacturers are updating and expanding tool capabilities to take into account the new simulation challenges, and new and specialized tools have been developed to cope with problems related to the installation of DER devices. This paper is aimed at reviewing the present status and the future trends of simulation tools for analysis and planning of distribution systems with penetration of DER, including market-oriented analysis and real-time simulation.
Źródło:
Electrical Power Quality and Utilisation. Journal; 2009, 15, 1; 33-50
1896-4672
Pojawia się w:
Electrical Power Quality and Utilisation. Journal
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:
The Importance of Internet And Online Social Networks in the Spanish Hotel Sector
Autorzy:
Infante-Moro, A.
Infante-Moro, J-C.
Martínez-López, F-J.
García-Ordaz, M.
Powiązania:
https://bibliotekanauki.pl/articles/118135.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Promocji Wiedzy
Tematy:
hotels
online social networks
internet
e-commerce
cross-sectional study
Opis:
This paper is a cross-sectional study on the use of Internet and Online Social Networks in the Spanish hotel sector compared to Spanish companies in other sectors. The conclusions from this extensive survey are that the use of online social networks is more important and is more developed in the hotel sector than in Spanish companies in general. However, although it gives considerable importance to online social networks, the hotel sector needs to revise its rules of usage. The use of new tools such as e-commerce to sell the hotel stays must increase, and marketing efforts should be geared more towards online social networks because the hotel sector is currently losing ground in a market that generates more and more potential clients and sales by the day.
Źródło:
Applied Computer Science; 2016, 12, 1; 75-86
1895-3735
Pojawia się w:
Applied Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
DYn-2 is an excellent chemical reporter for the Arabidopsis sulfenome
Autorzy:
Akter, M.
Wahni, K.
Martinez-Acedo, P.
Carroll, K.
van Breusegem, F.
Messens, J.
Powiązania:
https://bibliotekanauki.pl/articles/80760.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
conference
oxidative stress
redox signal
Arabidopsis thaliana
DYn-2 reporter
purification
sulphenome
stress tolerance
Źródło:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2013, 94, 2
0860-7796
Pojawia się w:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Simultaneous measurement of evaporating fuel spray using laser induced exciplex fluorescence
Autorzy:
Martine--Martínez, S.
Sánchez-Cruz, F. A
Rodríguez-Morales, G.
Riesco-Ávila, J. M.
Gallegos-Munoz, A.
Powiązania:
https://bibliotekanauki.pl/articles/243044.pdf
Data publikacji:
2007
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
thermal engine
direct injection
liquid phase
vapour phase
penetration length
Opis:
A macroscopic analysis of experimental measurements offuel sprays penetration on evaporating conditions using the Laser Induced Fluorescence Planar technique is presented. A pure fuel and tracers have been used to determine the two-phase process of the spray by characterizing the wavelengths they display when excited by a laser beam. An experimental set-up based on a single cylinder engine [1, 2], an Nd:YAG laser, an image acquisition system and a system of injection common rail have been used to carry out the experimental processes. Experimental results show the behaviour of the vapour phase and liquid phase in the spray under different thermodynamic conditions and injection parameters in the combustion chamber, particularly the work-fluid density and the injection pressure were observed. The measurement of these parameters is of interest to design the combustion chamber geometry and the piston bowl features of modern direct injection Diesel engines. In particularly, the sschematic diagram and main components of the equipment, cross-sectional view of the cylinder head, experimental layout of PLIEF imaging tests and images, examples of the liquid phase and vapour phase penetration, maximum penetration of the liquid and vapour phase as function of the work fluid density, Maximum penetration of the phase as function of the work fluid density, maximum penetration of the liquid and vapour phase as function of the injection pressure are presented in the paper.
Źródło:
Journal of KONES; 2007, 14, 2; 315-326
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Biotic interaction between spionid polychaetes and bouchardiid brachiopods: Paleoecological, taphonomic and evolutionary implications
Autorzy:
Rodrigues, S.C.
Simoes, M.G.
Kowalewski, M.
Petti, M.A.V.
Nonato, E.F.
Martinez, S.
del Rio, C.J.
Powiązania:
https://bibliotekanauki.pl/articles/21792.pdf
Data publikacji:
2008
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
biotic interaction
spionid polychaete
polychaete
bouchardiid brachiopod
brachiopod
paleoecology
evolution
Brachiopoda
Spionidae
Caulostrepsis
Bouchardia
Cenozoic
Brazil
Opis:
Shells of Bouchardia rosea (Brachiopoda, Rhynchonelliformea) are abundant in Late Holocene death assemblages of the Ubatuba Bight, Brazil, SW Atlantic. This genus is also known from multiple localities in the Cenozoic fossil record of South America. A total of 1211 valves of B. rosea, 2086 shells of sympatric bivalve mollusks (14 nearshore localities ranging in depth from 0 to 30 m), 80 shells of Bouchardia zitteli, San Julián Formation, Paleogene, Argentina, and 135 shells of Bouchardia transplatina, Camacho Formation, Neogene, Uruguay were examined for bioerosion traces. All examined bouchardiid shells represent shallow−water, subtropical marine settings. Out of 1211 brachiopod shells of B. rosea, 1201 represent dead individuals. A total of 149 dead specimens displayed polychaete traces (Caulostrepsis). Live polychaetes were found inside Caulostrepsis borings in 10 life−collected brachiopods, indicating a syn−vivo interaction (Caulostrepsis traces in dead shells of B. rosea were always empty). The long and coiled peristomial palps, large chaetae on both sides of the 5th segment, and flanged pygidium found in the polychaetes are characteristic of the polychaete genus Polydora (Spionidae). The fact that 100% of the Caulostrepsis found in living brachiopods were still inhabited by the trace−making spionids, whereas none was found in dead hosts, implies active biotic interaction between the two living organisms rather than colonization of dead brachiopod shells. The absence of blisters, the lack of valve/site stereotypy, and the fact that tubes open only externally are all suggestive of a commensal relationship. These data document a new host group (bouchardiid rhynchonelliform brachiopods) with which spionids can interact (interestingly, spionid−infested sympatric bivalves have not been found in the study area despite extensive sampling). The syn−vivo interaction indicates that substantial bioerosion may occur when the host is alive. Thus, the presence of such bioerosion traces on fossil shells need not imply a prolonged post−mortem exposure of shells on the sea floor. Also, none of the Paleogene and Neogene Bouchardia species included any ichnological evidence for spionid infestation. This indicates that the Spionidae/ Bouchardia association may be geologically young, although the lack of older records may also reflect limited sampling and/or taphonomic biases.
Źródło:
Acta Palaeontologica Polonica; 2008, 53, 4
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dynamic rheology and microstructure of starch gels affected by triticale genomic composition and developing stage
Autorzy:
Cornejo-Ramirez, Y.I.
Cinco-Moroyoqui, F.J.
Carvajal-Millan, E.
Brown-Bojorquez, F.
Rosas-Burgos, E.C.
Burgos-Hernandez, A.
Martinez-Cruz, O.
Del Toro-Sanchez, C.L.
Powiązania:
https://bibliotekanauki.pl/articles/24257.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Źródło:
International Agrophysics; 2019, 33, 1
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study on health risk factors as a basis to implement programs that promote a nutritional culture in students of the la Sabana University
Autorzy:
Rodriguez, S.
Martinez, M.
Segnini, F.
Cajiao, V.
Aivasovsky, I.
Celis, L.G.
Ayala, J.
Rozo, C.
Russi, A.
Girata, V.
Almonacid, C.C.
Powiązania:
https://bibliotekanauki.pl/articles/2087202.pdf
Data publikacji:
2021
Wydawca:
Narodowy Instytut Zdrowia Publicznego. Państwowy Zakład Higieny
Tematy:
health promotion
disease prevention
obesity
non-communicable diseases
healthy lifestyle
Opis:
Background. Nowadays the importance of lifestyles in the prevention of type 2 diabetes and the metabolic syndrome has been largely accertained. Objective. The purpose of our work is to implement programs that promote a nutritional culture in adolescents and young adults of the La Sabana University. Methods. The methodology entailed, after the corresponding informed consent, taking measures of the triceps and supraescapular skinfolds, waist circumference, body mass index (BMI), lean mass, and fat mass. Fasting blood samples were also taken to quantify cholesterol, triglycerides, high density lipoprotein (HDL) and low density lipoprotein (LDL). Results. The results obtained show that of the 165 students, 10.3% were underweight, 13.93% were overweight and 0.6% were obese. With regards to gender, 4.8% of the men and 9% of the women were overweight, 3% of the men and 7.2% of the women were underweight, and 0.6% of the women were obese. The blood chemistry showed that 30% had hypercholesterolemia, 18% hypertriglyceridemia, 17% reported low HDL levels and 67% reported high LDL levels. Of all the cases studied, 40% are at risk of a metabolic syndrome. 60% claimed not to practice any physical activity - especially women who reported 44.70%. Conclusions. These findings have allowed us at the institution to implement a culture of healthy habits. The have also allowed us to identify students with risk factors for type 2 diabetes and metabolic syndrome. This is why the cardio- metabolic monitoring and control based on healthy eating and physical activity are important.
Źródło:
Roczniki Państwowego Zakładu Higieny; 2021, 72, 1; 89-94
0035-7715
Pojawia się w:
Roczniki Państwowego Zakładu Higieny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Control of natural mycobiota in maize grains by ultraviolet (UVC) irradiation
Zwalczanie naturalnych mikobiot w ziarnie kukurydzy za pomocą promieniowania ultrafioletowego (UVC)
Autorzy:
Paez, C.L.R.
Reyes, M.C.P.
Aguilar, C.H.
Pacheco, F.A.D.
Martinez, E.M.
Orea, A.C.
Bonilla, J.L.L.
Powiązania:
https://bibliotekanauki.pl/articles/36667.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
natural mycobiota
mycobiota
fungi
control
maize grain
Zea mays
ultraviolet irradiation
Opis:
The effect of UV-C light as a means of control of natural mycobiota of grains of maize (Zea mays L.) hybrids “San Juan” and ”H-159” (productive cycle, 2009) was investigated. UV-C lamps of 15 W were used and the exposure times applied were 0, 5, 10, 15, 20, 25 and 30 min. The experiment was established in the randomised complete block design with eight and four replicates. The unit pilot was 50 grains. For the determination of mycobiota the agar plate test was used, after disinfection of the grains with sodium hypochlorite diluted to 3% for 1 min. Differences (P ≤ 0.001, P ≤ 0.05) between treatments were found, the best treatments being those of 30 and 10 min, observing reductions of 42.85 and 52.05% in the number of grains infected with Fusarium spp. with respect to control for “San Juan” and “H-159”, respectively. For Fusarium monoliforme it was found that in 30 min there was a reduction of 53.74% for the hybrid “San Juan”, while for H-159 a reduction of 61.7% in 10 minutes was observed. These results show that UV-C radiation may be useful for application as a germicide in future experiments on a wide variety of grains.
Badano wykorzystanie promieniowania UV-C jako metody zwalczania naturalnych mikobiot ziarna hybryd kukurydzy (Zea mays L.) “San Juan” i ”H-159” (cykl produkcyjny, 2009). Zastosowano lampy UV-C o mocy 15 W, a czasy ekspozycji wynosiły 0, 5, 10, 15, 20, 25 oraz 30 min. Doświadczenie założono metodą kompletnych bloków randomizowanych w ośmiu i czterech powtórzeniach. Jednostka pilotażowa wynosiła 50 ziaren. Dla określenia mikobiot zastosowano test agarowy po uprzedniej dezynfekcji ziarna 3% roztworem podchlorynu sodu przez 1 min. Stwierdzono różnice (P ≤ 0,001, P ≤ 0,05) pomiędzy obiektami doświadczenia. Najlepsze wyniki uzyskano dla czasów ekspozycji 30 i 10 min, uzyskując odpowiednio 42,85 oraz 52,05% redukcję ilości ziaren zakażonych Fusarium spp. dla ziarna hybryd “San Juan” i “H-159” w odniesieniu do kontroli. W odniesieniu do Fusarium monoliforme stwierdzono, że po czasie naświetlania 30 min nastąpiła redukcja o 53,74% dla hybrydy “San Juan”, a dla H-159 stwierdzono spadek o 61,7% po 10 minutach. Te wyniki wykazują, że promieniowanie UV-C może być użyteczne do stosowania jako zabieg zarodnikobójczy w przyszłych doświadczeniach na rożnych rodzajach ziarna.
Źródło:
Acta Agrophysica; 2011, 18, 2[193]
1234-4125
Pojawia się w:
Acta Agrophysica
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-14 z 14

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