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Wyświetlanie 1-15 z 23
Tytuł:
The operation parameters of an engine supplied with diesel oil and B20 fuel
Wskaźniki pracy silnika zasilanego olejem napędowym i paliwem B20
Autorzy:
Ambrozik, T.
Bozkir, M.
Martinez, M. R.
Ucar, M.
Powiązania:
https://bibliotekanauki.pl/articles/133601.pdf
Data publikacji:
2015
Wydawca:
Polskie Towarzystwo Naukowe Silników Spalinowych
Tematy:
combustion engine
exhaust gases emission
operation parameters of the engine
tłokowy silnik spalinowy
emisja spalin
wskaźniki pracy silnika
Opis:
The purpose of the paper is to compare selected operation parameters of an engine supplied with, respectively, commercial diesel oil and the B20 mixture (80 v/v % of diesel oil and 20 v/v % of rape oil fatty acid methyl esters). During the tests, the engine was running following the load characteristics at crankshaft rotational speed of 1750 rpm and 4000 rpm, respectively. The paper describes the test stand and block diagram of a system designed for measuring cylinder pressure, injection line pressure and injector operation control current. The emissions of nitrogen oxides, hydrocarbons, carbon monoxide and carbon dioxide were measured during the tests.
Celem artykułu jest porównanie wybranych parametrów pracy silnika zasilanego handlowym olejem napędowym i mieszaniną B20 (80 % V/V oleju napędowego i 20 % V/V estrów metylowych kwasów tłuszczowych oleju rzepakowego). Podczas badań silnik pracował według charakterystyk obciążeniowych przy prędkościach obrotowych wału korbowego 1750 obr/min i 4000 obr/min. W artykule opisano stanowisko badawcze oraz schemat blokowy układu do pomiaru ciśnienia w cylindrze, ciśnienia w przewodzie wtryskowym i prądu sterującego pracą wtryskiwacza. Podczas badań mierzono emisję tlenków azotu, węglowodorów, tlenku węgla i dwutlenku węgla.
Źródło:
Combustion Engines; 2015, 54, 3; 1036-1041
2300-9896
2658-1442
Pojawia się w:
Combustion Engines
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Scattering of Elastic Waves in a Quasi-One-Dimensional Cavity: Theory and Experiment
Autorzy:
Báez, G.
Cobián-Suárez, M.
Martínez-Argüello, A.
Martínez-Mares, M.
Méndez-Sánchez, R.
Powiązania:
https://bibliotekanauki.pl/articles/1399047.pdf
Data publikacji:
2013-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
46.40.Cd
62.30.+d
03.65.Nk
73.21.Fg
Opis:
We study the scattering of torsional waves through a quasi-one-dimensional cavity both from the experimental and theoretical points of view. The experiment consists of an elastic rod with square cross-section. In order to form a cavity, a notch at a certain distance of one end of the rod was grooved. To absorb the waves, at the other side of the rod, a wedge, covered by an absorbing foam, was machined. In the theoretical description, the scattering matrix S of the torsional waves was obtained. The distribution of S is given by Poisson's kernel. The theoretical predictions show an excellent agreement with the experimental results. This experiment corresponds, in quantum mechanics, to the scattering by a delta potential, in one dimension, located at a certain distance from an impenetrable wall.
Źródło:
Acta Physica Polonica A; 2013, 124, 6; 1069-1073
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Safety Attitudes and Their Relationship to Safety Training and Generalised Self-Efficacy
Autorzy:
Grau, R.
Martinez, I. M.
Agut, S.
Salanova, M.
Powiązania:
https://bibliotekanauki.pl/articles/90433.pdf
Data publikacji:
2002
Wydawca:
Centralny Instytut Ochrony Pracy
Tematy:
attitudes toward safety
training
efficacy beliefs
szkolenie zawodowe
szkolenie BHP
szkolenie służby bezpieczeństwa
samoocena
socjotechnika
socjologia pracy
Opis:
This paper studies safety attitudes, their relationship with safety training behaviour, and generalised self-efficacy. From a sociotechnical perspective, training programs might be used as a mechanism for enhancing attitudes, especially to improve safety and occupational health. Also, self-efficacy allows to enhance training effectiveness. The aim of this paper is to validate a safety attitude scale and to examine its relationship to safety training behaviour and self-efficacy in organisational settings. With data from 140 employees, results show a conceptually meaningful 3-factor solution. Hierarchical multiple regression analysis shows a main effect of safety training behaviour and levels of self-efficacy on safety attitude. Study limitations and its implications on safety training design are also discussed.
Źródło:
International Journal of Occupational Safety and Ergonomics; 2002, 8, 1; 23-35
1080-3548
Pojawia się w:
International Journal of Occupational Safety and Ergonomics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Antioxidant activity responses under freezing stress in two potato cultivars with different sensibility
Autorzy:
Mora-Herrera, M.
Martinez-Gutierrez, R.
Lopez-Delgado, H.
Powiązania:
https://bibliotekanauki.pl/articles/79984.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
conference
cultivated plant
potato cultivar
antioxidant activity
freezing stress
abiotic stress
biotic stress
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:
CFD analysis of the effect of the exhaust manifold design on the close-coupled catalytic converter performance
Autorzy:
Martinez-Martinez, S.
Leal-Garza, R. D.
Sanchez-Cruz, F. A.
Villarreal, E. B.
Amado-Covarrubias, M.
Powiązania:
https://bibliotekanauki.pl/articles/247790.pdf
Data publikacji:
2010
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
Close-Coupled Catalytic Converter
Exhaust Manifold
flow uniformity
pressure drop
Opis:
It is a common practice to mount a catalytic converter directly at the outlet of the exhaust manifold in order to reduce the cold start emissions from the automotive engines by improving the light-off time. The so called Close-Coupled Converter, because of its nearness to the engine, is more exposed to non-uniform fluid flows comingfrom the individual manifold runners, what frequently yields a stream of gases flowing mainly through a section of the monolith causing the aging of the catalyst and low conversion efficiency, among other negative effects. Computational Fluid Dynamics (CFD) has became a very useful and widely used tool to analyze and optimize this kind of exhaust after-treatment systems in a relatively fast and accurate way for design purposes. There are several designs of exhaust manifolds whose shape and dimensions are mainly restricted not only by the engine characteristics but by the space constraints of the particular vehicles they are designedfor. In this work the commercial CFD code ANSYS FLUENT was used to evaluate and compare the effect of three shapes of exhaust manifolds on the fluid flow uniformity at the entrance of the Close-Coupled Converter. Pressure drop in the entire Manifold-Converter device is also an important parameter considered for the design evaluation. The manifolds investigated are of type cast, 4-2-1 and L-shaped, which are commonly used in the automotive industry.
Źródło:
Journal of KONES; 2010, 17, 4; 303-311
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Impurity-Related Nonlinear Optical Absorption in Delta-Doped Quantum Rings
Autorzy:
Restrepo, R.
Martínez-Orozco, J.
Barseghyan, M.
Mora-Ramos, M.
Duque, C.
Powiązania:
https://bibliotekanauki.pl/articles/1195152.pdf
Data publikacji:
2014-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.65.-k
73.21.-b
78.67.-n
Opis:
Using a variational procedure within the effective mass approximation, we have calculated the hydrogenic impurity binding energy as well as the impurity-related nonlinear optical absorption in a single quantum ring with axial n-type delta-doping. The delta-like potential along the z-direction is analytically modeled with a Hartree-like confining profile fitted to a one-dimensional Thomas-Fermi-based potential in the local density approximation. Both on-center and on-edge impurity positions are considered and the energies of the impurity states are examined as functions of the vertical size of the ring. It is found that the effect of changes in the geometry of the quantum ring leads to a shifting of the resonant peaks of the intra-band optical spectrum.
Źródło:
Acta Physica Polonica A; 2014, 125, 2; 245-247
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
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:
Competition and critical periods in spring sugar beet cultivation
Autorzy:
Martinez, J.M.
de Juan Valero, J.-A
Padilla, A.D.
Picornell Buendia, M.-R.
Powiązania:
https://bibliotekanauki.pl/articles/66152.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
competition
critical period
spring sugar-beet
sugar-beet
plant cultivation
weed
irrigation
yield
Opis:
High yields with low costs require that sugar beets be kept free of weeds, during critical periods, using labor or chemical treatments. Since the critical periods for this crop in Castilla – La Mancha (Spain) are unknown, the first goal of this study was to determine the effect of early and late competition on yield. The second goal was to determine the critical periods, while taking into consideration the semiarid climatic conditions of this region. Two irrigation farms located in the province of Albacete are dedicated to sugar beet cultivation. These two farms were chosen to carry out the tests March (140,000–150,000 seeds ∙ ha–1) and harvested in October. Two simultaneous and complementary experiments were carried out in each year and farm. Two scenarios were considered with eight different treatments each. In the first one (With Weeds Until – WWU), plots were infested by weeds up to a certain date. In the second one (Free of Weeds Until – FWU), plots were kept free of weeds up to a certain date. For each test, a randomised experimental blocked field was designed and there were four repetitions, each of them containing eight elemental plots (12 m2). Each plot was weeded by hand or weeds were left to grow till a definite date.The results indicated that a 1% loss of yield was reached in the early competition after 14 days, while a loss of 5% was reached after a period of 41 days after it was infested. The results also indicated that in late competition, if a crop is kept clean for 124 days and it is infested afterwards, a 1% loss is reached. However, the loss increases to 5% if the plot is kept clean for 111 days. For a 1% loss the critical period is 110 days and 70 days for a 5% loss.
Źródło:
Journal of Plant Protection Research; 2015, 55, 4
1427-4345
Pojawia się w:
Journal of Plant Protection Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
High intensity LED light in lettuce seed physiology (Lactuca sativa L.)
Zastosowanie światła LED wysokiej intensywności w fizjologii nasion sałaty (Lactuca sativa L.)
Autorzy:
Pardo, G.P.
Aguilar, C.H.
Martinez, F.R,.
Pacheco, A.D.
Martinez, C.L.
Ortiz, E.M.
Powiązania:
https://bibliotekanauki.pl/articles/36994.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
high intensity
LED light
light intensity
lettuce
seed
plant physiology
Lactuca sativa
plant development
plant growth
Opis:
In order to improve the physiology of plants, this research evaluated the effect of high-intensity LED light (red, blue and green) on the following variables: germination (PG), hypocotyl length (HL), fresh (FW) and dry (DW) weight, in three types of lettuce seed (White Boston, Romana and Black Simpson). Exposure times with colour light were 12, 6 and 3h, with a complement of time for treatments with 6 and 3h of white LED light. We used a completely randomised design with four replications of 30 seeds. Treatments with green and red light to 12h had increases above 90% in HL against the control for the three varieties. The blue light treatment (3h) increased 23% in FW White Boston variety and the red light (3h) increased 14% the DW variable in Roman variety, compared to the control. In this study, treatments with colour light presented results above the control; however, a treatment with a single type of light is not optimal to improve plant physiology. The physiological responses evaluated showed variation related to the genotype of seed and to the time of exposure to high-intensity LED light, so this type of light is a viable option for improving the physiology of plants.
W celu uzyskania poprawy fizjologii roślin, w badaniach dokonano oceny wpływu światła LED wysokiej intensywności (czerwone, niebieskie i zielone) na następujące zmienne: kiełkowanie (PG), długość hipokotylu (HL), świeżej (FW) i suchej (DW) masy nasion trzech odmian sałaty (White Boston, Romana i Black Simpson). Czasy naświetlania światłem barwnym wynosiły 12, 6 and 3 h, z uzupełniającym doświetlaniem wariantów z czasami 6 i 3 h białym światłem LED. Zastosowano kompletnie zrandomizowany układ doświadczenia, w czterech powtórzeniach po 30 nasion. Warianty ze światłem zielonym i czerwonym oraz czasami naświetlania do 12 h wykazały ponad 90% wzrost HL w stosunku do kontroli dla trzech odmian. W wariancie ze światłem niebieskim (3 h) uzyskano 23% wzrost parametru FW u odmiany White Boston, a w wariancie ze światłem czerwonym (3 h) 14% wzrost zmiennej DW u odmiany Roman, w porównaniu do kontroli. W badaniach zastosowanie naświetlania światłem barwnym dało lepsze wyniki niż w przypadku kontroli, jednak naświetlanie jednym rodzajem światła nie jest optymalne dla uzyskania poprawy fizjologii roślin. Oceniane reakcje fizjologiczne zmieniały się w zależności od genotypu nasion i czasu naświetlania światłem LED wysokiej intensywności, tak więc zastosowanie tego typu światła stanowi możliwą opcję w poprawie fizjologii roślin.
Źródło:
Acta Agrophysica; 2013, 20, 4
1234-4125
Pojawia się w:
Acta Agrophysica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Histopathological modifications induced ny mebendazole and niridazole on encysted larvae of Trichinella spiralis in CD-1 mice
Modyfikacje zmian histopatologicznych w encystowanych larwach Trichinella spiralis wywołane podawaniem mebendazolu i niridazolu u myszy CD-1
Modifikacii gistopatologicheskikh izmenenijj v ehcistirovannykh lichinkakh Trichinella spiralis, vyzvannoe podachejj mebendazola i niridazola u myshejj CD-1
Autorzy:
Martinez-Fernandez, A.R.
Samartin-Duran, M.L.
Toro Rojas, M.
Ubeira, F.M.
Rodriguez Cabeiro, F.
Powiązania:
https://bibliotekanauki.pl/articles/2152739.pdf
Data publikacji:
1987
Wydawca:
Polskie Towarzystwo Parazytologiczne
Źródło:
Wiadomości Parazytologiczne; 1987, 33, 4-5; 525-535
0043-5163
Pojawia się w:
Wiadomości Parazytologiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Support to maritime and inland waterways service providers for the transmission of EGNOS Corrections via IALA beacons and AIS/VDES stations
Autorzy:
López, M.
Cano, M.
Martínez, R.
Álvarez, C.
Tavira, L.
Morán, J.
Antón, V.
Vázquez, J.
Powiązania:
https://bibliotekanauki.pl/articles/117535.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
inland waterways
IALA beacons
AIS stations
VDES stations
EGNOS
EGNOS corrections
AIS Service Manager (ASM)
Virtual Reference Station (VRS)
Opis:
The use of SBAS corrections for navigation, in both coastal waters and inland waterways, has already brought the attention of many European authorities, which are interested in its potential to complement/replace their DGPS radio beacon networks. The European GNSS Agency (GSA) has an active long-term trajectory working to foster the EGNOS adoption in maritime through the launch of several actions whose results will pave the way for the provision of maritime EGNOS services. In this line, GSA awarded the consortium ALG-Indra, ESSP and Alberding with the Specific Contract GSA/OP/07/13/SC24 ‘Support to Maritime Service Providers for the transmission of EGNOS corrections via IALA beacons and AIS/VDES stations’. The main objective of this Specific Contract is to demonstrate the operational performance of the transmission of EGNOS corrections converted to Differential GPS corrections over the existing transmission infrastructure (AIS base stations/IALA beacons) in the Maritime and Inland Waterways (IWW) domains, while providing a detailed cost benefit analysis of the solutions proposed. This service may complement the current GNSS augmentation services exploiting synergies and benefiting from the current infrastructure and standards, facilitating the adoption of EGNOS by maritime and inland waterways authorities. Furthermore, the service has no impact at user level since the DGNSS corrections are transmitted over the existing infrastructure, in the same format and implementing the same integrity mechanisms required for traditional IALA beacons ([1]). This project will allow the maritime and IWW service providers to have a clear understanding about the technical, operational and economic feasibility of the transmission of EGNOS corrections via IALA beacons and AIS/VDES stations.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2019, 13, 1; 45-52
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cap Formation Induced by Concanavalin A in Pathogenic Free-living Amoebae
Autorzy:
González-Robles, A.
Cristóbal-Ramos, A. R.
González-Lázaro, M.
Omaña-Molina, M.
Martínez-Palomo, A.
Powiązania:
https://bibliotekanauki.pl/articles/763565.pdf
Data publikacji:
2011
Wydawca:
Uniwersytet Jagielloński. Wydawnictwo Uniwersytetu Jagiellońskiego
Tematy:
Free-living amoebae, Con A, capping, polar redistribution
Opis:
Morphological differences in cap formation were found when trophozoites of different free-living amoebae were treated with the lectin Concanavalin A, which resulted in a rapid redistribution of certain surface components to form small clusters and membrane-folded structures of diverse sizes. Acanthamoeba castellanii, Acanthamoba polyphaga and Naegleria lovaniensis exhibited characteristic caps, however, in A. castellanii this structure was larger and included several folds of the plasma membrane; furthermore, some of these caps had vacuoles containing a fi bro granular content. In contrast, the caps formed by A. polyphaga and N. lovaniensis lacked vacuoles. Regarding Naegleria fowleri, the trophozoites did not produce a defi ned cap, and only small patches of lectin-bound surface receptor complexes were observed at one pole of the cell body. In the free-living amoebae studied, it was not possible to correlate the shape and size of cap with pathogenicity.
Źródło:
Acta Protozoologica; 2011, 50, 2
1689-0027
Pojawia się w:
Acta Protozoologica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fungal spores in four catholic churches in the metropolitan area of Monterrey, Nuevo León State, Mexico – First study
Autorzy:
Estrada, A.R.
Torres, E.M.
Vazquez, M.A.A.
Pinero, J.L.H.
Lucio, M.A.G.
Martinez, S.M.S.
Powiązania:
https://bibliotekanauki.pl/articles/52132.pdf
Data publikacji:
2015
Wydawca:
Instytut Medycyny Wsi
Źródło:
Annals of Agricultural and Environmental Medicine; 2015, 22, 2
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 23

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