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Wyświetlanie 1-15 z 58
Tytuł:
Analysis of a cross-channel micromixer through the dynamics of tracer gradient
Autorzy:
Gonzalez, M.
Powiązania:
https://bibliotekanauki.pl/articles/281009.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
Low-Reynolds number flows
mixing enhancement
micromixers
Opis:
The study aims at showing how the dynamics of tracer gradient accounts for the stirring mechanism produced by a periodically forced flow relevant to practical mixing operation. The numerical simulation uses the equations for the orientation and norm of the tracer gradient and an analytic model for velocity. To a large extent, the micromixer properties over different ranges of the Strouhal number are explained through the response of the tracer gradient orientation to the tilting of strain principal axes resulting from flow forcing. The analysis also reveals a rich picture of stirring as the Strouhal number is varied.
Źródło:
Journal of Theoretical and Applied Mechanics; 2016, 54, 4; 1257-1269
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Halloysite as Mineral Adsorbent of CO2 – Kinetics and Adsorption Capacity
Haloizyt jako adsorbent mineralny CO2 – badania kinetyki adsorpcji i pojemności sorpcyjne
Autorzy:
Lutyński, M.
Sakiewicz, P.
Gonzalez, M. A. G.
Powiązania:
https://bibliotekanauki.pl/articles/318447.pdf
Data publikacji:
2014
Wydawca:
Polskie Towarzystwo Przeróbki Kopalin
Tematy:
physical adsorption
carbon dioxide
halloysite
adsorption kinetics
adsorpcja fizyczna
dwutlenek węgla
haloizyt
kinetyka adsorpcji
Opis:
Physical adsorption of carbon dioxide on various mineral adsorbents is becoming extremely interesting in the field of energy and environment where CCS technology is an option for CO2 emission reduction. In the article the halloysite from Dunino deposit was assessed in terms of its potential use as a CO2 adsorbent. Results of tests indicate that modified halloysite (i.e. calcinated or modified by acid treatment) has a relatively low adsorption capacity which should be easily increased by other surface modification methods. Sorption kinetic is rather fast and over 85-89% of CO2 adsorption is accounted by a rapid sorption step i.e. 7 to 16 seconds.
Procesy adsorpcji fizycznej CO2 na różnego rodzaju adsorbentach mineralnych są istotne z punktu widzenia technologii wychwytywania i separacji tego gazu z dużych źródeł stacjonarnych (CCS). W artykule przedstawiono wyniki adsorpcji CO2 na haloizycie ze złoża Dunino, który może mieć potencjalne zastosowanie w technologiach adsorpcyjnych. Rezultaty badań wskazują, że adsorpcja CO2 na modyfikowanym haloizycie tj. kalcynowanym oraz kwasowanym jest relatywnie niska w porównaniu z innymi adsorbentami mineralnymi, jednakże odpowiednia metoda jego modyfikacji może zwiększyć znacznie jego chłonność sorpcyjną. Przeanalizowano również kinetykę sorpcji, gdzie oszacowano iż 85-89% CO2 adsorbuje się w czasie 7-16 sekund.
Źródło:
Inżynieria Mineralna; 2014, R. 15, nr 1, 1; 111-117
1640-4920
Pojawia się w:
Inżynieria Mineralna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Advantages of application of the backscattered electron scanning images in the determination of soil structure and soil constituents
Autorzy:
Wierzchos, J.
Garcia-Gonzalez, M.T.
Ascaso, C.
Powiązania:
https://bibliotekanauki.pl/articles/25149.pdf
Data publikacji:
1995
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
soil structure
backscattered electron scanning image
soil constituent
microanalytical technique
soil component
Źródło:
International Agrophysics; 1995, 09, 1
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Acoustic Absorption of Mortar Composites with Waste Material
Autorzy:
Stumpf González, M. A.
Flach, M.
Reschke Pires, J.
Piva Kulakowski, M.
Powiązania:
https://bibliotekanauki.pl/articles/950217.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
acoustics
comfort
impedance tube
civil construction
waste
Opis:
This paper presents an investigation about acoustic absorption of mortars with partial replacement of sand by waste (plywood formwork, rice husk, and thermoplastic shoe counters), examining different levels of replacement (0%, 5%, 10%, 25%, and 50%). The measurement of acoustic absorption was performed using a plane wave impedance tube with 100 mm diameter, using mortar samples of 20 mm, in frequency range 200-2000 Hz. Results demonstrated that some composite with waste presented noise reduction coefficient (NRC) above the reference mortar (NRC = 0.0343), such as a composite with 50% rice husk (NRC = 0.2757) and other with 50% of plywood waste (NRC = 0.2052). Since there is virtually no cost or difficulty to use these residuals, it may be concluded that it is a sustainable alternative to improve the acoustic comfort and reduce the impact of the waste on the environment.
Źródło:
Archives of Acoustics; 2013, 38, 3; 417-423
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Interface of organisational ageing and organisational ecology theory
Autorzy:
Vargas-Hernández, José G.
Rakowska, Joanna
Vargas-González, M. C. Omar C.
Powiązania:
https://bibliotekanauki.pl/articles/11364551.pdf
Data publikacji:
2022-09-30
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
Tematy:
organisational ecology
organisational aging
organisation change
organisation theory
Opis:
The study aimed to conclude on the up-to-date state of the organisational ecology theory concerning relations between organisational ageing and organisational ecology, enhanced by social and ecological systems and ecological management. The applied method included analytical and reflective concluding, based on the synthesis of findings from a critical literature review. It was concluded that: (i) organisational ageing generates some of the most important consequences in organisational ecology; however, there is still no consensus on what kind of consequences prevail; (ii) at population level, the adaptation of organisational structures occurs with the replacement of old organisations that fail to adapt by the new ones; (iii) under the prevalent backdrop of radical structural and strategic changes, individual organisations are subject to inertial forces and thus are confronted with limitations to their success; (iv) ageing has positive consequences for innovative activities of older companies; and (v) the higher the density and concentration of industry, the higher the rates of founding firms and the lower the rates of mortality.
Źródło:
Marketing Instytucji Naukowych i Badawczych; 2022, 45, 3; 57-70
2353-8414
Pojawia się w:
Marketing Instytucji Naukowych i Badawczych
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:
Raman Study of Multicrystalline Silicon Wafers Produced by the RST Process
Autorzy:
Tejero, A.
Tupin, E.
González, M.
Martínez, O.
Jiménez, J.
Belouet, C.
Baillis, C.
Powiązania:
https://bibliotekanauki.pl/articles/1198416.pdf
Data publikacji:
2014-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.30.Am
61.72.Ff
88.40.jj
Opis:
In the silicon ribbon on a sacrificial template process silicon is deposited on both sides of a carbon ribbon, thus forming a Si/carbon/Si trilayer. The fast cooling of the ribbon in large temperature gradients generates stresses that are detrimental to both the electrical performance and the mechanical behaviour of the wafers. The assessment of the stresses is crucial for the setting-up of thermal treatments allowing for the stress relaxation of the wafers, prior to the cell fabrication. We present an analysis of the stress in the as-grown trilayer by a simulation of the thermomechanical behaviour of the cooling ribbon. Experimental measurements of the stress in as-grown and annealed trilayers are also presented. The results permit to establish the conditions for optimized growth and annealing.
Źródło:
Acta Physica Polonica A; 2014, 125, 4; 1006-1009
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
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:
Thirty-four identifiable airborne fungal spores in Havana, Cuba
Autorzy:
Almaguer, M.
Aira, M.-J.
Rodriguez-Rajo, F.J.
Fernandez-Gonzalez, M.
Rojas-Flores, T.I.
Powiązania:
https://bibliotekanauki.pl/articles/51658.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
Tytuł:
Residual Strain and Electrical Activity of Defects in Multicrystalline Silicon Solar Cells
Autorzy:
Martínez, O.
Mass, J.
Tejero, A.
Moralejo, B.
Hortelano, V.
González, M.
Jiménez, J.
Parra, V.
Powiązania:
https://bibliotekanauki.pl/articles/1198419.pdf
Data publikacji:
2014-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.30.Am
61.72.Ff
88.40.jj
Opis:
The growth process by casting methods of multi-crystalline Si results in a crystalline material with, among other defects, a high density of dislocations and grain boundaries. Impurity incorporation and their gathering around grain boundaries and dislocations seem to be the main factor determining the electrical activity of those defects, which limit the minority carrier lifetime. In this work, we analyze multi-crystalline Si samples by combining etching processes to reveal the defects, Raman spectroscopy for strain measurements, and light beam induced current measurements for the localization of electrically active defects. In particular, we have explored the etching routes capable to reveal the main defects (grain boundaries and dislocation lines), while their electrical activity is studied by the light beam induced current technique. We further analyze the strain levels around these defects by Raman micro-spectroscopy, aiming to obtain a more general picture of the correlation between residual stress and electrical activity of the extended defects. The higher stress levels are observed around intra-grain defects associated with dislocation lines, rather than around the grain boundaries. On the other hand, the intra-grain defects are also observed to give dark light beam induced current contrast associated with a higher electrical activity of these defects as compared to the grain boundaries.
Źródło:
Acta Physica Polonica A; 2014, 125, 4; 1013-1016
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Forecasting ARIMA models for atmospheric vineyard pathogens in Galicia and Northern Portugal: Botrytis cinerea spores
Autorzy:
Fernandez-Gonzalez, M.
Rodriguez-Rajo, F.J.
Jato, V.
Aira, M.J.
Ribeiro, H.
Oliveira, M.
Abreu, I.
Powiązania:
https://bibliotekanauki.pl/articles/49793.pdf
Data publikacji:
2012
Wydawca:
Instytut Medycyny Wsi
Opis:
Botrytis cinerea is the cause of the most common disease in the Galician and Portuguese vineyards. Knowledge of the spore levels in the atmosphere of vineyards is a tool for forecasting models of the concentration of spores in order to adjust the phytosanitary treatments to real risk infection periods. The presented study was conducted in two vineyards, one located in Cenlle (Spain) and other in Amares (Portugal), from 2005-2007. A volumetric trap, model Lanzoni VPPS-2000, was used for the aerobiological study. Phenological observations were conducted on 20 vines of three grape varieties in Cenlle (Treixadura, Godello and Loureira) and in Amares (Trajadura, Loureiro and Pedernã), by using the BBCH scale. The highest total spore concentrations during the grapevine cycle were recorded in 2007 in both locations (Cenlle:16,145 spores; Amares:1,858 spores), and the lowest, in 2005 in Cenlle (1,700 spores) and in Amares (800 spores) in 2006. In Cenlle, the best adjusted model was an ARIMA (0,2,2), including the relative humidity four days earlier, while in Amares there was an ARIMA (1,2,3), considering the relative humidity three days earlier and rainfall two days earlier. The t-test showed no significant difference between observed and predicted data by the model.
Źródło:
Annals of Agricultural and Environmental Medicine; 2012, 19, 2
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Theoretical analysis of the efficiency of a V2G wireless charger for electric vehicles
Autorzy:
Triviño, Alicia
Gonzalez-Gonzalez, Jose M.
Aguado, Jose A.
Powiązania:
https://bibliotekanauki.pl/articles/136256.pdf
Data publikacji:
2019
Wydawca:
EEEIC International Barbara Leonowicz Szabłowska
Tematy:
V2G
wireless discharge
losses
efficiency
electric vehicle
inductively-coupled power system
ICPT
bidirectional
wireless charging
Opis:
V2G (Vehicle-to-grid) technology will report important benefits for the operation and safety of the grid. In order to facilitate the expansion of the V2G technology in a future, it is recommended to offer the drivers with easy to use methods to charge and discharge their EV batteries. In this sense, wireless chargers are expected to play a relevant role in the future electrical networks as it reduces the users intervention. The development of this kind of system is still open to improve them in terms of their operation, their compliance and their control. An important issue for the evaluation of these systems is the efficiency, which measures the power losses occurring in the system. This paper addresses a deep study about the losses in a bidirectional wireless charger. Then, it provides with a mathematical model to characterize them. This model is validated by means of experimental results conducted in a 3.7-kW prototype.
Źródło:
Transactions on Environment and Electrical Engineering; 2019, 3, 1; 9-14
2450-5730
Pojawia się w:
Transactions on Environment and Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mines, quarries and landscape. Visuality and transformation
Kopalnie, kamieniołomy i krajobraz. Wizualność i przekształcenie
Autorzy:
Jimeno, C. L.
Torrijos, I. D.
González, C. M.
Powiązania:
https://bibliotekanauki.pl/articles/410006.pdf
Data publikacji:
2016
Wydawca:
STE GROUP
Tematy:
landscape
landscape integration
visuality
requalification
krajobraz
integracja krajobrazowa
widoczność
przekwalifikowanie
Opis:
In this paper a review of two basic concepts is carried out: scenery and landscape integration, proposing a new concept: "visuality", alternative to the classical "visibility" used in landscape studies related to mining activity, which explores the qualitative aspects that define the visual relationships between observer and environment. In relation to landscape integration studies, some reflections on substantive issues are made which induce certain prejudices at the time of addressing the issue of mining operations landscape integration, and some guidance and integration strategies are formulated. In the second part of the text, a new approach to the landscape integration of mines and quarries is raised, closely linked to the concept of visuality which are based on a basic goal: the requalification of the place, and give innovative answers to requalify the place and show how to catch the opportunity in the deep transformation generated by the development of mining activities. As a conclusion, a case study is presented in the last section, the landscape integration study conducted on marble exploitations Coto Pinos (Alicante, Spain), considered the largest ornamental rock quarry in Europe.
W niniejszym artykule przeprowadzono przegląd dwóch podstawowych pojęć: scenerii i krajobrazowej integracji, proponując nowe pojęcie: „wizualność”. Ma ono zastąpić klasyczne pojęcie „widoczności” stosowane w pracach dotyczących krajobrazów związanych z działalnością kopalń, które bada aspekty jakościowe i określa wizualne relacje między obserwatorem a środowiskiem. Nawiązując do prac na temat krajobrazowej integracji można potwierdzić, iż dotychczas zostały opracowane pewne spostrzeżenia dotyczące kwestii merytorycznych, które wywołują pewne uprzedzenia podczas próby rozwiązania tej kwestii w odniesieniu do działalności górniczej w krajobrazowej integracji i formułowaniu wskazówek i strategii integracji. W drugiej części artykułu poruszona została nowa metoda krajobrazowej integracji kopalń i kamieniołomów. Jest ona ściśle powiązana z pojęciem wizualności i oparta jest na podstawowym celu, którym jest innowacyjne podejście do przekwalifikowania miejsca oraz wskazania w jaki sposób można wykorzystać możliwości terenów poważnie zdegradowanych przez działalność kopalń. W podsumowaniu pracy przedstawiono studium przypadku. Badanie krajobrazowej integracji przeprowadzono na kamieniołomie marmuru w Coto Pinos (Alicante, Hiszpania), który jest uważany za największy w Europie.
Źródło:
Management Systems in Production Engineering; 2016, 2 (22); 110-122
2299-0461
Pojawia się w:
Management Systems in Production Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Gathering an edible wild plant: food or medicine? A case study on wild edibles and functional foods in Granada, Spain
Autorzy:
Benítez, G.
Molero-Mesa, J.
Reyes González-Tejero, M.
Powiązania:
https://bibliotekanauki.pl/articles/57844.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Botaniczne
Opis:
A study on wild edible resources has been performed in the western part of Granada Province (Spain) using ethnobotanical methods. We document and analyze knowledge concerning wild edible plants and mushrooms and their folk medicinal uses in the study area. Several botanical features and use characteristics have been analyzed for the species included, with special attention to their medicinal uses, highlighting a large number of edible-medicinal species. Local importance of the medicinal uses for these resources has been confirmed. Up to 135 species are gathered from the wild in the study area, from which 46 can be considered folk functional foods. In addition, 45 crop plants with uncommon edible or medicinal uses are included, 29 of these being considered functional foods as well. Therefore, a total of 75 plant species are used as edible medicines which serve to treat 36 different conditions. The local concept of food and medicine regarding wild plant resources seems not to be well established. Studies on the pharmacological properties of these foods are needed in order to establish their real or potential benefits for the treated affections.
Źródło:
Acta Societatis Botanicorum Poloniae; 2017, 86, 3
0001-6977
2083-9480
Pojawia się w:
Acta Societatis Botanicorum Poloniae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Numerical Approach to Calculate the Radiation Efficiency of Baffled Planar Structures Using the Far Field
Autorzy:
González-Montenegro, M. A.
Jordan, R.
Lenzi, A.
Arenas, J. P.
Powiązania:
https://bibliotekanauki.pl/articles/176303.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
propagating matrix
far field
sound power
structural finite element analysis
Opis:
A numerical method is developed for estimating the acoustic power of any baffled planar structure, which is vibrating with arbitrary surface velocity profile. It is well known that this parameter may be calculated with good accuracy using near field data, in terms of an impedance matrix, which is generated by the discretization of the vibrating surface into a number of elementary radiators. Thus, the sound pressure field on the structure surface can be determined by a combination of the matrix and the volume velocity vector. Then, the sound power can be estimated through integration of the acoustic intensity over a closed surface. On the other hand, few works exist in which the calculation is done in the far field from near field data by the use of radiation matrices, possibly because the numerical integration becomes complicated and expensive due to large variations of directivity of the source. In this work a different approach is used, based in the so-called Propagating Matrix, which is useful for calculating the sound pressure of an arbitrary number of points into free space, and it can be employed to estimate the sound power by integrating over a finite number of pressure points over a hemispherical surface surrounding the vibrating structure. Through numerical analysis, the advantages/disadvantages of the current method are investigated, when compared with numerical methods based on near field data. A flexible rectangular baffled panel is considered, where the normal velocity profile is previously calculated using a commercial finite element software. However, the method can easily be extended to any arbitrary shape. Good results are obtained in the low frequency range showing high computational performance of the method. Moreover, strategies are proposed to improve the performance of the method in terms of both computational cost and speed.
Źródło:
Archives of Acoustics; 2014, 39, 2; 249-260
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
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