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


Tytuł:
Consumer affinity as a key factor to mitigate reluctance to buy foreign products: The moderating role of organic and induced image to counteract negative communication campaigns and image crises
Autorzy:
Serrano-Arcos, M. Mar
Sanchez Fernández, Raquel
Pérez-Mesa, Juan Carlos
Powiązania:
https://bibliotekanauki.pl/articles/39990489.pdf
Data publikacji:
2024
Wydawca:
Instytut Badań Gospodarczych
Tematy:
reluctance to buy
consumer affinity
perceived value and risk
organic and induced image
counteracting negative campaigns
Opis:
Research background: Anti-consumption practices, in particular consumers’ reluctance to buy (RTB) foreign products, are increasingly common in today’s globalised and interconnected markets. This phenomenon is accentuated by the impact of negative consumer dispositions (e.g., animosity or ethnocentrism), which contribute to an unfavourable perception of foreign products and, consequently, increase RTB. However, knowledge about possible factors that may mitigate this RTB foreign products is limited, and even less is known about the influence that positive dispositions (e.g., affinity) may have on consumer perceptions and consumption/non-consumption decisions. Moreover, consumers are inundated with information from various sources, which can significantly influence their perceptions and image of a product-country, especially in a context associated with negative communication campaigns and image crises. Purpose of the article: This research delves into the study of consumer affinity towards a foreign country, understood as an emotional feeling or positive disposition of a consumer that may mitigate their RTB foreign products, which often results from negative communication campaigns and a country-product image crisis. In addition, its influence on perceived risk and value, and the impact of these on RTB, is investigated. The moderating effect of the organic and induced image formed by the consumer on the risk-value relationship is also analysed, determining whether the induced image undermines this relationship. Methods: The empirical study focuses on the Spanish agri-food sector, which has been the subject of negative communication campaigns and image crises in foreign markets. The conceptual model was tested in a sample of German consumers, as Germany is the primary destination country for these products and has also been the origin of several image crises in this sector. PLS-SEM was used to validate the proposed hypotheses. Findings & value added: This research underlines the importance of fostering feelings of affinity towards a country and its products as a means to counteract negative campaigns, increase perceived value and mitigate RTB in foreign destination markets. Companies and public institutions, which influence the formation of the induced image in consumers, can contribute to improving consumers’ perception of a product-country. By shedding light on these dynamics, this study offers valuable insights for companies trying to cope with image crises fuelled by negative communication campaigns, which are increasingly prevalent in the competitive international landscape.
Źródło:
Oeconomia Copernicana; 2024, 15, 2; 717-763
2083-1277
Pojawia się w:
Oeconomia Copernicana
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Solar generation estimation in electric power systems for prospective frequency control studies
Autorzy:
Martínez-García, A. A.
Torres-Breffe, O. E.
Vilaragut-Llanes, M.
Delgado-Fernandez, O.
Szpytko, J.
Salgado-Duarte, Y.
Powiązania:
https://bibliotekanauki.pl/articles/2172499.pdf
Data publikacji:
2022
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
green shipping
solar power
electric power systems
energy storage systems
photovoltaic power generation
cuban electrical system
energy sources
photo voltage solar generation
Opis:
Increasing the presence of non-conventional clean energy sources in Electrical Power Systems (EPS) is a global strategic goal. Particularly, photovoltaic systems are attractive due to their versatility, low maintenance cost, easy installation, noiselessness, etc. However, the integration of photovoltaic systems into EPS increases the necessary regulation actions performed by system generators due to stochastic fluctuations of solar radiation, especially on cloudy days. Even using complex models that consider many variables, solar irradiation and its corresponding photovoltaic power generation are difficult variables to forecast with accuracy in cloudy day scenarios. To address this problem, Energy Storage Systems (BESS) have been proposed as a solution to mitigate the variability of photovoltaic generation, which reduce the need to use traditional spinning reserves and provide auxiliary grid services. The BESS selection required to mitigate photovoltaic generation is directly related to the worst-case daily variability of photovoltaic generation in the short term. This paper proposes a practical estimation of daily perspective photo voltage solar generation curve in Electrical Power Systems.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2022, 16, 2; 211--217
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
New Eocene South American native ungulates from the Quebrada de los Colorados Formation at Los Cardones National Park, Argentina
Autorzy:
Fernandez, M.
Zimicz, A.N.
Bond, M.
Chornogubsky, L.
Arnal, M.
Cardenas, M.
Fernicola, J.C.
Powiązania:
https://bibliotekanauki.pl/articles/2082287.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
Mammalia
South American native ungulates
Casamayoran SALMA
Paleogene
Quebrada de Los
Colorados Formation
Argentina
Opis:
In the last few years, the Quebrada de Los Colorados Formation has become an important middle Eocene fossiliferous unit in Northwestern Argentina. In this unit, the South American native ungulates were until now only represented by the order Notoungulata, including one family of Typotheria and three of Toxodontia. In this contribution, we present a new faunistic assemblage of South American native ungulates, collected from outcrops of the Quebrada de Los Colorados Formation at Los Cardones National Park, Calchaquí Valleys, Salta Province (Argentina). This new assemblage is constituted by the following taxa: litoptern Didolodontidae cf. Ernestokokenia sp., Astrapotheria indet., and notoungulate Notostylopidae Homalostylops sp., a ?Homalostylops sp., typothere “Oldfieldthomasiidae” Colbertia falui sp. nov., Colbertia lumbrerense, and Colbertia sp. and toxodont “Notohippidae” Pampahippus secundus. Colbertia falui sp. nov. differs from the other species of Colbertia by the following features: lower cheek teeth with both more labially angular and oblique trigonid; lower premolars more labio-lingually compressed; with proportionally larger trigonid, and shorter talonid; ectoflexid transversally deeper; lower molars with a more developed paralophid, and more expanded metalophid and entoconid; the latter is located in a more mesial position, being closer to the metaconid; deep and lingually narrower talonid basin; disto-lingual sulcus transversally shallower; more developed cingulids; and m3 with less lingually projected hypoconulid. This new fauna markedly increases the taxonomic richness known for this formation since it includes the first mention of notostylopids, “oldfieldthomasiids”, litoptern didolodontids, and astrapotheres. With the current evidence, we postulate an ungulate migration from Patagonia to Northwestern Argentina during the Eocene. We also hypothesize that the observed taxonomic differences among the Quebrada de Los Colorados, Geste, and Lumbrera formations are more probably associated to orogenic factors that have regulated the faunal dynamic in Northwestern Argentina during the Paleogene than to a differential sampling effort or taphonomic biases.
Źródło:
Acta Palaeontologica Polonica; 2021, 66, 1; 85-97
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Systematic revision of a Miocene sperm whale from Patagonia, Argentina, and the phylogenetic signal of tympano-periotic bones in Physeteroidea
Autorzy:
Paolucci, F.
Buono, M.R.
Fernandez, M.S.
Cuitino, J.
Powiązania:
https://bibliotekanauki.pl/articles/2082284.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
Mammalia
Physeteroidea
Preaulophyseter gualichensis
Miocene
Patagonia
Argentina
Opis:
Sperm whales (Physeteroidea) include today only two genera of morphologically disparate odontocetes: the largest toothed whale known (Physeter macrocephalus) and small sized forms (Kogia spp.). In contrast, their fossil record indicates a high diversity for the group during the Miocene, with over 20 species recognized. Miocene marine sediments from Patagonia (Argentina) record this diversity, including at least five species. Among them, Preaulophyseter gualichensis, from the Miocene of Gran Bajo del Gualicho Formation, has been one of the most enigmatic. Despite the fragmentary nature of the type and referred materials (isolated teeth and periotics), which casts some doubts on its validity, this species has not been revised since its original description. In this contribution, we re-describe the materials referred to P. gualichensis, revise the taxonomic status of the species and evaluate the phylogenetic signal of ear bones among Physeteroidea. Our results indicate that the physeteroid tympano-periotic complex morphology is poorly diagnostic at the species level. Intraspecific variation (including ontogeny and sexual dimorphism) and/or taphonomic processes cannot be ruled out as the causes of the minor differences observed among specimens. We suggest that sperm whale tympano-periotics retain many plesiomorphic characters and are diagnostic only between kogiids and non-kogiid physeteroids. Based on the fragmentary and isolated state of the studied specimens, and the lack of diagnostic characters in both teeth and periotics, we consider P. gualichensis as nomen dubium and we re-assign the referred specimens as Physeteroidea indet. A conservative morphology of the tympano-periotic and, to a lesser extent, the nasal complex in sperm whales, might result from the morpho-functional constraints imposed by a highly specialized but successful echolocation system.
Źródło:
Acta Palaeontologica Polonica; 2021, 66, 1; 63-76
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Generation of H2 on board LNG vessels for consumption in the propulsion system
Autorzy:
Fernández, Ignacio Arias
Gómez, Manuel Romero
Gómez, Javier Romero
López-González, Luis M.
Powiązania:
https://bibliotekanauki.pl/articles/260010.pdf
Data publikacji:
2020
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
boil-off gas
efficiency
H2 storage
LNG vessel
reforming
Opis:
At present, LNG vessels without reliquefaction plants consume the BOG (boil-off gas) in their engines and the excess is burned in the gas combustion unit without recovering any of its energy content. Excess BOG energy could be captured to produce H2, a fuel with high energy density and zero emissions, through the installation of a reforming plant. Such H2 production would, in turn, require on-board storage for its subsequent consumption in the propulsion plant when navigating in areas with stringent anti-pollution regulations, thus reducing CO2 and SOX emissions. This paper presents a review of the different H2 storage systems and the methods of burning it in propulsion engines, to demonstrate the energetic viability thereof on board LNG vessels. Following the analysis, it is identified that a pressurised and cooled H2 storage system is the best suited to an LNG vessel due to its simplicity and the fact that it does not pose a safety hazard. There are a number of methods for consuming the H2 generated in the DF engines that comprise the propulsion plant, but the use of a mixture of 70% CH4-30% H2 is the most suitable as it does not require any modifications to the injection system. Installation of an on-board reforming plant and H2 storage system generates sufficient H2 to allow for almost 3 days’ autonomy with a mixture of 70%CH4-30%H2. This reduces the engine consumption of CH4 by 11.38%, thus demonstrating that the system is not only energy-efficient, but lends greater versatility to the vessel.
Źródło:
Polish Maritime Research; 2020, 1; 83-95
1233-2585
Pojawia się w:
Polish Maritime Research
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:
Pathway analysis to determine factors contributing to overall quality scores in four berry crops
Autorzy:
Cockerton, H.
Blanco Unzueta, M.
Johnson, A.W.
Vadillo Dieguez, A.
Fernandez Fernandez, F.
Powiązania:
https://bibliotekanauki.pl/articles/1077482.pdf
Data publikacji:
2020
Wydawca:
Instytut Ogrodnictwa
Tematy:
berry plant
blackberry
blueberry
raspberry
strawberry
fruit quality
environmental factor
agronomic factor
genetic factor
berry crop
Opis:
Fruit quality attributes are influenced by environmental, agronomic and genetic factors; both cultivars and growing conditions can vary substantially between UK production and imported fruit. This study aimed to record and dissect the most relevant fruit quality traits for berries imported into the UK in the winter months. Blackberry, blueberry, raspberry and strawberry fruit were imported from 11 countries into a Kent-based packhouse (UK) or purchased from major retailers between December 2018 and March 2019. Multiple fruit quality components were assessed for relative contribution towards a high “overall assessment” fruit quality score. It was found that strawberry and blackberry overall scores were affected by sweetness perception, whereas blueberry and raspberry organoleptics are more complex, with overall scores influenced by flavor perception. Multiple raspberry and strawberry fruit quality traits were found to be associated with genotypic differences, indicating a promising potential for genetic improvement through breeding. By contrast, the study findings suggest that there is less potential for genetic improvement in blueberry, and that the environment may have a large effect on blueberry fruit quality traits.
Źródło:
Journal of Horticultural Research; 2020, 28, 2; 35-42
2300-5009
Pojawia się w:
Journal of Horticultural Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Detection of significant wavelengths for identifying and classifying Fusarium oxysporum during the incubation period and water stress in Solanum lycopersicum plants using reflectance spectroscopy
Autorzy:
Ortiz, J.C.M.
Carvajal, L.M.H.
Fernandez, V.B.
Powiązania:
https://bibliotekanauki.pl/articles/65540.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Opis:
Spectroscopy has become one of the most used non-invasive methods to detect plant diseases before symptoms are visible. In this study it was possible to characterize the spectral variation in leaves of Solanum lycopersicum L. infected with Fusarium oxysporum during the incubation period. It was also possible to identify the relevant specific wavelengths in the range of 380–1000 nm that can be used as spectral signatures for the detection and discrimination of vascular wilt in S. lycopersicum. It was observed that inoculated tomato plants increased their reflectance in the visible range (Vis) and decreased slowly in the near infrared range (NIR) measured during incubation, showing marked differences with plants subjected to water stress in the Vis/NIR. Additionally, three ranges were found in the spectrum related to infection by F. oxysporum (510–520 nm, 650–670 nm, 700–750 nm). Linear discriminant models on spectral reflectance data were able to differentiate between tomato varieties inoculated with F. oxysporum from healthy ones with accuracies higher than 70% 9 days after inoculation. The results showed the potential of reflectance spectroscopy to discriminate plants inoculated with F. oxysporum from healthy ones as well as those subjected to water stress in the incubation period of the disease.
Źródło:
Journal of Plant Protection Research; 2019, 59, 2
1427-4345
Pojawia się w:
Journal of Plant Protection Research
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:
Impact of subsidies in agriculture on the value of fixed assets on agricultural farms in Poland and Spain in light of FADN data in the years 2004-2016
Wpływ subwencji w rolnictwie na wartość środków trwałych w gospodarstwach rolnych w Polsce i w Hiszpanii w świetle danych FADN w latach 2004-2016
Autorzy:
Węgrzyńska, M.
Fernandez, P.M.
Powiązania:
https://bibliotekanauki.pl/articles/1790456.pdf
Data publikacji:
2019
Wydawca:
The Polish Association of Agricultural and Agribusiness Economists
Tematy:
środki trwałe w rolnictwie
FADN
rachunkowość rolna
subwencje w rolnictwie
fixed assets in agriculture
agricultural accounting
subsidies in agriculture
Opis:
The article presents changes in the value of fixed assets in relation to the amounts of subsidies directed to farms in two selected European Union countries – Poland and Spain – in the years 2004-2016. Both of these countries were selected on the basis of similar qualitative and quantitative characteristics that are characteristic of agriculture. An additional determinant of the choice of these countries was a similar economic situation before and after accession to the structures of the European Union. The article consists of an introduction, where the essence and significance of fixed assets in agriculture is presented, followed by the material and methodology of the research. A comparison of fixed assets of both countries was based on statistical data from the European Farm Accountancy Data Network (FADN). Analysis of material shows that, in 2004-2016, in Poland and Spain, the value of fixed assets was strongly positively correlated with total subsidies – excluding subsidies on investment (SE605), total direct payments (SE606), subsidies on intermediate consumption (SE625) and decoupled payments (SE630). Additionally, it was determined that, in Poland and Spain, the value of fixed assets was strongly negatively correlated with total subsidies on crops (SE610) and other subsidies (SE699). The value of property, plant and equipment in Poland and Spain increased gradually during the period under review.
W artykule określono zmiany wartości środków trwałych w odniesieniu do kwot subwencji kierowanych do gospodarstw rolnych w dwóch wybranych krajach Unii Europejskiej – Polsce i Hiszpanii – w latach 2004-2016. Oba te kraje zostały wybrane na podstawie zbliżonych cech jakościowych i ilościowych charakterystycznych dla rolnictwa. Dodatkową determinantą wyboru tych krajów była podobna sytuacja ekonomiczna przed i po przystąpieniu tych krajów do Unii Europejskiej. Porównanie środków trwałych obu krajów oparto na danych statystycznych pochodzących z European Farm Accountancy Data Network (FADN). Z analizy materiału wynika, że w latach 2004-2016 w Polsce i w Hiszpanii wartość środków trwałych była silnie dodatnio skorelowana z dopłatami do działalności operacyjnej (SE605), płatnościami bezpośrednimi (SE606), dopłatami do zużycia bezpośredniego (SE625), a także z jednolitymi płatnościami obszarowymi oraz dodatkowymi płatnościami (SE630). Dodatkowo określono, że w Polsce i w Hiszpanii wartość środków trwałych była silnie ujemnie skorelowana z dopłatami do produkcji roślinnej (SE610) oraz pozostałymi dopłatami (SE699). Wartość środków trwałych w Polsce i w Hiszpanii w okresie objętym badaniem ulegała sukcesywnemu zwiększeniu.
Źródło:
Annals of The Polish Association of Agricultural and Agribusiness Economists; 2019, 21, 4; 551-560
2657-781X
2657-7828
Pojawia się w:
Annals of The Polish Association of Agricultural and Agribusiness Economists
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
New findings of airborne fungal spores in the atmosphere of Havana, Cuba, using aerobiological non-viable methodology
Autorzy:
Almaguer-Chaves, M.
Aira, M.J.
Rojas, T.-I.
Fernandez-Gonzalez, M.
Rodriguez-Rajo, F.-J.
Powiązania:
https://bibliotekanauki.pl/articles/2081740.pdf
Data publikacji:
2018
Wydawca:
Instytut Medycyny Wsi
Tematy:
airborne fungal spores
non-viable methodology
Havana
Cuba
Opis:
Introduction. Although airborne fungal diversity in tropical countries is known to be considerable, aerobiological research to-date has identified only a part of the fungal mycobiota that may have an impact both on human health and on crops. Previous studies in Havana city identified only 30 genera and 5 spore types; therefore,new research is required in these latitudes. This study sought to investigate airborne spore levels in Havana, with a view to learning more about local fungal diversity and assessing its influence in quantitative terms. Materials and method. A Hirst type volumetric sampler was located on the rooftop of a building 35 meters above ground level, in a busy area of the city. Sampling was carried out continuously (operating 24hours/day), at 10 L per minute during the year 2015. The fungal spores were collected on a Melinex tape coated with a 2% silicone solution. The results were expressed as spores per cubic meter (spores/m3) of air when to referring to daily values, and spores count if referring to annual value. Results. Fourteen new genera were identified in the course of volumetric sampling: six produce ascospores and eight conidia. Morphobiometric characteristics were noted for all genera, and airborne concentrations were calculated. These genera accounted for 56.4% of relative fungal frequency over the study year. Conclusions. Many airbone fungi are primary causes of both respiratory disease and crop damage. These new findings constitute a major contribution to Cuba’s aerobiological database.
Źródło:
Annals of Agricultural and Environmental Medicine; 2018, 25, 2; 349-359
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zastosowanie nowoczesnych cieczy roboczych w chwytakach robotów
Autorzy:
Osowski, K.
Fernández, M. A.
Olszak, A.
Huang, C. Y.
Kęsy, A.
Chang, J. Y.
Kęsy, Z.
Powiązania:
https://bibliotekanauki.pl/articles/305102.pdf
Data publikacji:
2018
Wydawca:
Wydawnictwo Druk-Art
Tematy:
chwytaki
sprzęgła wiskotyczne
ciecz elektroreologiczna
ciecz magnetoreologiczna
grasper
viscous coupling
electro-medical liquid
magnetorheological fluid
Opis:
W artykule omówiono wykorzystanie cieczy o nietypowych właściwościach w chwytakach robotów. Ciecze elektro- i magnetoreologiczne, zmieniające swoje właściwości reologiczne w obecności pola elektrycznego lub magnetycznego, zastosowano jako ciecze robocze sprzęgieł wiskotycznych, wchodzących w skład układu przeniesienia napędu chwytaków. Przedstawiono dwa rozwiązania konstrukcyjne prototypowych chwytaków robotów przemysłowych z takimi sprzęgłami. Rozważono również ciecze luminescencyjne, reagujące na nacisk, pod kątem ich zastosowania w mikroczujnikach siły nacisku szczęk chwytaka.
The paper discusses the use of modern fluids with untypical properties in robot grippers. The electro- and magnetorheological fluids, changing their rheological properties in the presence of an electric or magnetic field, were used as working fluids of viscous clutches included in the griper drive transmission system. Two design solutions were presented for prototype industrial robot grippers with such clutches. Luminescent pressure-sensitive fluids have also been considered for their use in the micro-sensors for sensing force of the gripper’s jaw.
Źródło:
Napędy i Sterowanie; 2018, 20, 3; 100-106
1507-7764
Pojawia się w:
Napędy i Sterowanie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Environmental changes during the last millennium recorded in subfossil Cladocera, diatoms and sediment geochemistry from Lake El Sol (Central Mexico)
Autorzy:
Zawisza, E.
Cuna, E.
Caballero, M
Ruiz-Fernandez, A. C.
Szeroczyńska, K.
Woszczyk, W.
Zawiska, I.
Powiązania:
https://bibliotekanauki.pl/articles/2060339.pdf
Data publikacji:
2017
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
crater Nevado de Toluca
lake sediments
tropical alpine lake
palaeolimnology
last millennium
Opis:
High-altitude lakes, which are very sensitive ecosystems and respond rapidly to climatic changes, are one of the best targets for palaeolimnological studies. Here, we present the record of environmental changes over the last millennium that are recorded in the sediments of El Sol, a tropical, high-altitude, volcanic crater lake on the Nevado de Toluca, Central Mexico. Palaeolimnological reconstructions are based on subfossil Cladocera, diatoms, magnetic susceptibility and chemical analysis of the sediments. In general, Cladocera occurring in tropical regions, and especially at high altitude, have been studied very little. Our data indicate that in the sequence studied, the species diversity of subfossil Cladocera is very low. Only four species were recorded, and the assemblage is dominated by littoral species. Two Cladocera taxa, Alona manueli and Ilyocryptus, found at Lake El Sol are endemic. Cladocera, diatoms and the sediment chemistry show changes in Lake El Sol which are mostly related to climate. The most pronounced climatic signal was obtained for the early Little Ice Age (1350–1625 AD). This cold episode was expressed by a reduction in the frequency of zooplankton (individuals/cm2/yr) and diatoms (valves/g of dry sediment) and by changes in the organic carbon content in the sediment. Our results show that human activity was very limited throughout the study period. According to historical data the presence of humans at the lake shore was mostly occasional, usually for ceremonial and ritual purposes, and humans did not have an important influence on the lake ecosystem. Only one period was identified when human activity was important. This period corresponds to the introduction of fish into the lake at the beginning of the 20th century.
Źródło:
Geological Quarterly; 2017, 61, 1; 81--90
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic and Heat Capacity Study of the new $Gd_{1-x}Ce_xNi_5$ Series
Autorzy:
Dzubinska, A.
Reiffers, M.
Espeso, J.
Rodríguez Fernández, J.
Powiązania:
https://bibliotekanauki.pl/articles/1398287.pdf
Data publikacji:
2017-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.27.+a
75.30.-m
75.30.Mb
Opis:
We have prepared a new system of $Gd_{1-x}Ce_xNi_5$ polycrystalline samples with concentrations x =0, 0.2, 0.5, and 0.8 in order to study the influence of different rare-earths substitutions on the ground state connected with spin fluctuations. GdNi₅ is a ferromagnetic compound with $T_{C}=31.8 K$ and CeNi₅ is a well-known spin fluctuation compound without magnetic ordering down to the lowest temperatures. X-ray diffraction study confirms the hexagonal crystal structure and the single phase samples. Magnetic properties (M(T),M(B)) show that an increasing content of Ce depresses the transition temperature, $T_{C}$, down to 4.9 K for x=0.8. The heat capacity measurements confirmed these results.
Źródło:
Acta Physica Polonica A; 2017, 131, 4; 997-999
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Template Assisted Deposition of Ferromagnetic Nanostructures: from Antidot Thin Films to Multisegmented Nanowires
Autorzy:
Prida, V.M.
Salaheldeen, M.
Pfitzer, G.
Hidalgo, A.
Vega, V.
González, S.
Teixeira, J.
Fernández, A.
Hernando, B.
Powiązania:
https://bibliotekanauki.pl/articles/1032144.pdf
Data publikacji:
2017-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.30.Gw
75.70.Kw
75.75.-c
75.70.-i
75.70.Rf
Opis:
The growth of nanostructured materials by means of different deposition methods employing nanoporous anodic aluminum oxide membranes as patterned templates has been widely used during last years due to the outstanding features displayed by these nanoporous templates. Here we report on the synthesis, morphology and magnetic properties exhibited by novel magnetic 1D and 2D nanostructured materials having nanowire or antidot thin films geometry, respectively, together to that of geometrically diameter modulated ferromagnetic nanowires. Their magnetic properties will be analyzed and discussed based on the different anisotropic behavior derived from their morphological and microstructural features.
Źródło:
Acta Physica Polonica A; 2017, 131, 4; 822-827
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł

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