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Tytuł:
Crustacean microcoprolites from the Upper Jurassic - Lower Cretaceous of the Meuquen Basin, Argentina: Systematics and biostratigraphic implications
Autorzy:
Kietzmann, D A
Blau, J.
Fernandez, D.E.
Palma, R.M.
Powiązania:
https://bibliotekanauki.pl/articles/21225.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Opis:
As a result of a microfacial study in the outer and middle ramp deposits of the Vaca Muerta Formation (lower Tithonian–upper Valanginian), four ichnotaxa of crustacean microcoprolites are described: Palaxius azulensis Kietzmann isp. nov., Palaxius caracuraensis Kietzmann isp. nov., Helicerina? isp. A. aff. Helicerina siciliana and Helicerina isp. B. They represent one of the first records of crustacean microcoprolites for the Neuquén Basin and Argentina. Helicerina is reported for the first time from the Upper Jurassic and Lower Cretaceous of South America. It is inferred that Palaxius ichnospecies were produced by callianassids, while Helicerina ichnospecies could be produced by decapods of Mecochiridae, Erymidae, and/or Nephropidae affinity. Two assemblages of crustacean microcoprolites are recognised, a middle Tithonian to lower Berriasian Palaxius−dominated assemblage and an early to late Valanginian Helicerina−dominated assemblage.
Źródło:
Acta Palaeontologica Polonica; 2010, 55, 2; 277-284
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Occupational exposure to carbon dioxide, ammonia and hydrogen sulphide on livestock farms in north-west Spain
Autorzy:
Barrasa, M.
Lamosa, S.
Fernandez, M.D.
Fernandez, E.
Powiązania:
https://bibliotekanauki.pl/articles/52212.pdf
Data publikacji:
2012
Wydawca:
Instytut Medycyny Wsi
Opis:
The influence of the type of farming on harmful gas exposures to carbon dioxide (CO2), ammonia (NH3) and hydrogen sulfide (H2S) was assessed from the perspective of animal welfare and occupational hygiene. Summer data of H2S, NH3 and CO2 concentrations and of environmental parameters were collected from 31 farms. The indices of exposure for longterm exposures to NH3 suggest the lowest acceptability of exposure was observed on poultry farms. CO2 had the highest dependence on production activity. For H2S, no differences were found based on farming activity. Both the stocking density and volume of air available affected the daily exposure and the index of exposure to CO2. Significant differences were observed between hourly CO2 concentrations, depending on the level of activity inside the building. A positive correlation was found between gas concentrations and temperature increase. All values of daily and short-term exposures were below exposure limit values, which suggests that exposure conditions were appropriate for workers’ health during the measurement period. Analysis of the working hours and average hourly concentration of gases during the times of day, with presence of workers inside the farm buildings, revealed significant differences for CO2.
Źródło:
Annals of Agricultural and Environmental Medicine; 2012, 19, 1
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Exactness of formal asymptotic solutions of a Dirichlet problem modeling the steady state of functionally-graded microperiodic nonlinear rods
Autorzy:
Décio, Roberto M.S.
Pérez-Fernández, Leslie D.
Bravo-Castillero, Julián
Powiązania:
https://bibliotekanauki.pl/articles/122748.pdf
Data publikacji:
2019
Wydawca:
Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
Tematy:
asymptotic homogenization
power-law nonlinearity
functionally-graded rods
stan ustalony
problem Dirichleta
metoda homogenizacji
rozwiązanie asymptotyczne
Opis:
In their usual form, homogenization methods produce first-order approximations of the exact solutions of problems for differential equations with rapidly oscillating coefficients which model the physical behavior of microstructured media. However, there is need of approximations containing higher-order terms when the usual first-order approximations, which are formed by superposing a macroscopic trend and a local perturbation, are not capable of reproducing the local details of the exact solutions. Here, two-scale asymptotic solutions with second-order terms are provided for a Dirichlet problem modeling the steady state of functionally-graded microperiodic nonlinear rods. The need of considering higherorder terms is illustrated through numerical examples for various power-law nonlinearities.
Źródło:
Journal of Applied Mathematics and Computational Mechanics; 2019, 18, 3; 45-56
2299-9965
Pojawia się w:
Journal of Applied Mathematics and Computational Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of air temperature on forecasting the start of Cupressaceae pollen type in Ponferrada [Leon, Spain]
Autorzy:
Fuertes-Rodriguez, C R
Gonzales-Parrado, Z.
Vega-Maray, A.M.
Valencia-Barrera, R.M.
Fernandez-Gonzales, D.
Powiązania:
https://bibliotekanauki.pl/articles/50902.pdf
Data publikacji:
2007
Wydawca:
Instytut Medycyny Wsi
Tematy:
Ponferrada
woody plant
pollen
aerobiology
heat requirement
Leon
Cupressaceae
forecast
chilling requirement
Spain
dormancy
Opis:
In order to survive periods of adverse cold climatic conditions, plant requirements are satisfi ed by means of physiological adaptations to prevent cells from freezing. Thus, the growth of woody plants in temperate regions slows down and they enter into a physiological state called dormancy. In order to identify the chilling and heat requirements to overcome the dormancy period of Cupressaceae pollen type in the south of Europe, we have carried out our study with aerobiological data from a 10-year (1996- 2005) period in Ponferrada, León (Spain). For the chilling requirements the best result was with a threshold temperature of 7.1ºC and an average of 927 CH. Calculation of heat requirements was carried out with maximum temperature, with 490 growth degree days (GDD) needed, with a threshold temperature of 0ºC. We have used the 2002-2003, 2003- 2004 and 2004-2005 periods in order to determine the real validity of the model. We have not used these years in developing the models. The dates predicted differ in only a few days from those observed: in 2002-2003 there was a difference of 11 days, in 2003-2004 predicted and observed dates were the same, but in 2004-2005 the difference obtained was of 43 days.
Źródło:
Annals of Agricultural and Environmental Medicine; 2007, 14, 2
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Molecular aerobiology-Plantago allergen Pla l 1 in the atmosphere
Autorzy:
Gonzalez-Parrado, Z.
Fernandez-Gonzalez, D.
Camazon, B.
Valencia-Barrera, R.M.
Vega-Maray, A.M.
Asturias, J.A.
Monsalve, R.I.
Mandrioli, P.
Powiązania:
https://bibliotekanauki.pl/articles/50756.pdf
Data publikacji:
2014
Wydawca:
Instytut Medycyny Wsi
Źródło:
Annals of Agricultural and Environmental Medicine; 2014, 21, 2
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
How foot morphology changes influence shoe comfort and plantar pressure before and after long distance running?
Autorzy:
Mey, Q.
Gu, Y.
Sun, D.
Fernandez, J.
Powiązania:
https://bibliotekanauki.pl/articles/306388.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
ciśnienie podeszwowe
obuwie
kształt stopy
komfort
bieg długodynstansowy
foot shape
plantar pressure
footwear
comfort
long distance running
Opis:
Prolonged running has been popularized globally in recent decades. This study was aimed to reveal information about foot morphology, shoe comfort and plantar loading among recreational heel-strike runners. Methods: Twenty-six runners participated in foot morphology, perceived scores and peak pressure tests after 10- and 20-km track running. The foot morphology was measured using a 3D foot scanner, perceived scores were recorded using a visual analogue scale and plantar pressure was measured via insole plantar pressure measurement system. The statistical significance level was set at 0.05. Results: The heel midsole materials properties were measured before and after 20 km. Significant changes were observed in ball width and girth, arch height and foot volume. The perceived scores showed significance in overall, forefoot and heel comfort, arch support and forefoot width. Peak pressure to the heel, medial mid-foot and metatarsal greatly increased. The first metatarsal showed consecutive increase from static to 10 km, and 20 km, while big-toe showed a decrease. Conclusions: The morphology variations and forefoot loading concentration may lead to discomfort and possibly imply dermatological problems and metatarsal bone stress, particularly on the first metatarsal. Combining changes of heel midsole property, knowledge of foot shape, shoe perception and plantar pressure is of great value for recreational long-distance running shoes design and materials selection.
Źródło:
Acta of Bioengineering and Biomechanics; 2018, 20, 2; 179-186
1509-409X
2450-6303
Pojawia się w:
Acta of Bioengineering and Biomechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A semi-analytic approach to calculating the Strehl ratio for a circularly symmetric system.Part 2: dynamic wavefront
Autorzy:
Castaño-Fernandez, A. B.
Martínez-Finkelshtein, A.
Iskander, D. R.
Powiązania:
https://bibliotekanauki.pl/articles/173593.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
image quality assessment
optical transfer function
longitudinal vibrations
mathematical methods in physics
finite analogs of Fourier transforms
Opis:
Close-form expression for the Strehl ratio calculated in the spatial frequency domain of the optical transfer function (SOTF) is considered for the case of time-varying dynamic optical system that has circular symmetry. Specifically, closed-form expressions for the temporally averaged SOTF are considered, which can be easily evaluated numerically (what we call a semi-analytic solution). As for the case of a static wavefront, described in Part 1 of this work, it is shown that the proposed methods are computationally more efficient than the commonly used approach based on the discrete Fourier transform.
Źródło:
Optica Applicata; 2018, 48, 2; 211-223
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A semi-analytic approach to calculating the Strehl ratio for a circularly symmetric system. Part 1: static wavefront
Autorzy:
Castaño-Fernandez, A. B.
Martínez-Finkelshtein, A.
Iskander, D. R.
Powiązania:
https://bibliotekanauki.pl/articles/174316.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
image quality assessment
optical transfer function
mathematical methods in physics
finite analogs of Fourier transforms
Opis:
Close-form expression for the Strehl ratio calculated in the spatial frequency domain of the optical transfer function (SOTF) is considered for the case of an optical system that has circular symmetry. First, it is proved that the SOTF for the aberration-free diffraction limited optical system is equal to one. Further, a semi-analytic solution for the SOTF for a system described by the second (defocus) and the fourth (spherical) order aberrations is provided. It is shown that the proposed semi-analytical solution is of an order of a magnitude computationally more efficient than the commonly used approach based on the discrete Fourier transformation.
Źródło:
Optica Applicata; 2018, 48, 2; 201-210
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of microbial consortium in the production of China aster and gaillardia seedlings
Autorzy:
Fernandez, M.
Nachu, N.S.
Revanna, A.
Bagyaraj, J.D.
Powiązania:
https://bibliotekanauki.pl/articles/1077469.pdf
Data publikacji:
2020
Wydawca:
Instytut Ogrodnictwa
Tematy:
China aster
gaillardia seedling
flowering plant
inoculation
arbuscular mycorrhizal fungi
Funneliformis mosseae
Bacillus sonorensis
plant growth-promoting rhizobacteria
Opis:
China aster and gaillardia are flowering plants with high economic importance in floriculture. In the present investigation, response of China aster and gaillardia seedlings to inoculation with the arbuscular mycorrhizal fungus Funneliformis mosseae + the plant growth-promoting rhizobacterium Bacillus sonorensis was studied by growing in multipots (pro trays). The germination percentage and plant growth parameters: length of shoots, roots and whole seedlings, stem diameter, biovolume index, plant strength, vigor index, dry weight and nutrient uptake, were analyzed 60 days after sowing. The microbial parameters, mycorrhizal root colonization and spore count, and the population of B. sonorensis in the substrate were also determined. The results brought out that growth of inoculated seedlings was significantly improved as compared to uninoculated seedlings. Based on the plant growth and microbial parameters studied, it was concluded that inoculating the substrate in pro trays with the microbial consortium results in producing vigorously growing seedlings.
Źródło:
Journal of Horticultural Research; 2020, 28, 2; 21-28
2300-5009
Pojawia się w:
Journal of Horticultural Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Prediction of biological sensors appearance with ARIMA models as a tool for Integrated Pest Management protocols
Autorzy:
Fernandez-Gonzalez, M.
Ramos-Valcarcel, D.
Aira, M.J.
Rodriguez-Rajo, F.J.
Powiązania:
https://bibliotekanauki.pl/articles/50204.pdf
Data publikacji:
2016
Wydawca:
Instytut Medycyny Wsi
Źródło:
Annals of Agricultural and Environmental Medicine; 2016, 23, 1
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Calcium phosphate preservation of faecal bacterial negative moulds in hyaena coprolites
Autorzy:
Pesquero, M.D.
Souza-Egipsy, V.
Alcala, L.
Ascaso, C.
Fernandez-Jalvo, Y.
Powiązania:
https://bibliotekanauki.pl/articles/22871.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Opis:
The vertebrate fossil locality of La Roma 2, Spain (Upper Miocene, Late Vallesian, MN10) is characterised by a high abundance of mammalian coprolites, which provide direct clues to the diets and habitats of the organisms that produced them. X-ray diffraction analysis showed a sample of hyaena (cf. Lycyaena chaeretis) coprolites to be mostly composed of calcium phosphate. Ultrastructural SEM and TEM studies revealed three successive phases of preservation, including an initial phase of mineralisation that produced microspherulites within a very fine-grained cement. This indicates that most of the calcium phosphate present in the coprolites precipitated rapidly, which in turn facilitated the formation of negative moulds of faecal bacteria within the coprolite matrix.
Źródło:
Acta Palaeontologica Polonica; 2014, 59, 4
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Highly Linear Low Pass Filter for Low Voltage Reconfigurable Wireless Applications
Autorzy:
Csipkes, G.
Hintea, S.
Csipkes, D.
Rus, C.
Festila, L.
Fernandez-Canque, H.
Powiązania:
https://bibliotekanauki.pl/articles/385009.pdf
Data publikacji:
2009
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:
software radio
reconfigurable filters
Opis:
This paper presents a reconfigurable and programmable analogue low pass filter for low voltage wireless applications. The proposed filter may be used for channel or band selection in multi-mode receiver front ends employing direct frequency conversion. The circuit has been synthesized using state variables and leapfrog OTA-C techniques, features programmable order, digitally variable frequency parameters and wide linear range. The fundamental OTA cell has been implemented with fully balanced second-generation current conveyors, suitable for operating with low supply voltages. Transistor level simulations based on a 180 nm digital CMOS technology have demonstrated the functionality of the design.
Źródło:
Journal of Automation Mobile Robotics and Intelligent Systems; 2009, 3, 2; 76-81
1897-8649
2080-2145
Pojawia się w:
Journal of Automation Mobile Robotics and Intelligent Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Psychometric Quality of the Sharenting Evaluation Scale (SES) in Argentinian Adults
Autorzy:
Tisocco, Franco
Liporace, Mercedes Fernández
D’Anna, Ana
Gago, Paula
Hoffmann, Agustín Freiberg
Powiązania:
https://bibliotekanauki.pl/articles/48481873.pdf
Data publikacji:
2024-06-30
Wydawca:
Wydawnictwo Adam Marszałek
Tematy:
sharenting
Sharenting Evaluation Scale
social media
psychometric properties
Opis:
“Sharenting” refers to parents or relatives sharing images/information of young family members on social media, which can negatively affect children. Previous studies lacked standardized measures, except for the Sharenting Evaluation Scale (SES) validated in Spain. This study aimed to validate the SES in an Argentinian sample (255 adults), test its factor structure, and explore associations with sociodemographic factors. Confirmatory Factor Analysis confirmed the model’s adequacy with satisfactory internal consistency, and cross-validation and invariance revealed similar results. Associations were found with age, number of social networks used, and gender. Findings support the use of the SES to assess Sharenting.
Źródło:
The New Educational Review; 2024, 76; 181-194
1732-6729
Pojawia się w:
The New Educational Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Demandasaurus darwini, a new rebbachisaurid sauropod from the Early Cretaceous of the Iberian Peninsula
Autorzy:
Fernandez-Baldor, F.T.
Canudo, J.I.
Huerta, P.
Montero, D.
Pereda Suberbiola, X.
Salgado, L.
Powiązania:
https://bibliotekanauki.pl/articles/22403.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
Demandasaurus darwini
new species
rebbachisaurid sauropod
sauropod
paleontology
Early Cretaceous
Cretaceous
Iberian Peninsula
Spain
Sauropoda
Rebbachisauridae
systematics
paleobiogeography
Opis:
A new medium−sized rebbachisaurid sauropod from the Castrillo la Reina Formation (Upper Barremian–Lower Aptian) in Burgos Province, Demandasaurus darwini gen. et sp. nov., is described. It is known from an incomplete but associated skeleton that includes cranial and post−cranial remains. Demandasaurus darwini gen. et sp. nov. presents 9 autapomorphies in the teeth and vertebrae. Demandasaurus is the first diplodocoid sauropod described from the Cretaceous of the Iberian Peninsula. Its inclusion in the Rebbachisauridae is well supported by our phylogenetic hypothesis, which situates it as a sister group of Nigersaurus from the Aptian of Niger, with which it shares various synapomorphies. The discovery of Demandasaurus provides further evidence of the sporadic use of the Apulian Route by dinosaurs during the Early Cretaceous for moving between the south of Europe (Laurasia) and the north of Africa (Gondwana).
Źródło:
Acta Palaeontologica Polonica; 2011, 56, 3
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 19

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