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Wyszukujesz frazę "García, J." wg kryterium: Autor


Tytuł:
When is the category of flat modules abelian?
Autorzy:
García, J.
Martínez Hernández, J.
Powiązania:
https://bibliotekanauki.pl/articles/1208371.pdf
Data publikacji:
1995
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Opis:
Let Fl(R) denote the category of flat right modules over an associative ring R. We find necessary and sufficient conditions for Fl(R) to be a Grothendieck category, in terms of properties of the ring R.
Źródło:
Fundamenta Mathematicae; 1995, 147, 1; 83-91
0016-2736
Pojawia się w:
Fundamenta Mathematicae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Elastic constants influence on the L4-L5-S1 annuli fibrosus behavior, a probabilistic finite element analysis
Autorzy:
Jaramillo, H. E.
Garcia, J. J.
Powiązania:
https://bibliotekanauki.pl/articles/307431.pdf
Data publikacji:
2017
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
FEM
hiperelastyczność
krążek międzykręgowy
analiza probabilistyczna
finite element analysis
hyperelastic
range of motion
intervertebral discs
probabilistic analysis
sensitivity factor
Opis:
A probabilistic finite element (FE) analysis of the L4-L5 and L5-S1 human annulus fibrosus (AF) was conducted to obtain a better understanding of the biomechanics of the AF and to quantify its influence on the range of motion (ROM) of the L4-L5 and L5-S1 segments. Methods: The FE models were composed of the AF and the upper and lower endplates. The AF was represented as a continuous material composed of a hyperelastic isotropic Yeoh matrix reinforced with two families of fibers described with an exponential energy function. The caudal endplate was fully restricted and 8 Nm pure moment was applied to the cranial endplate in flexion, extension, lateral flexion and axial rotation. The mechanical constants were determined randomly based on a normal distribution and average values reported. Results: Results of the 576 models show that the ROM was more sensitive to the initial stiffness of the fibers rather than to the stiffening coefficient represented in the exponential function. The ROM was more sensitive to the input variables in extension, flexion, axial rotation and lateral bending. The analysis showed an increased probability for the L5-S1 ROM to be higher in flexion, extension and axial rotation, and smaller in lateral flexion, with respect to the L4-L5 ROM. Conclusions: An equation was proposed to obtain the ROM as a function of the elastic constants of the fibers and it may be used to facilitate the calibration process of the human spine segments and to understand the influence of each elastic constant on the ROM.
Źródło:
Acta of Bioengineering and Biomechanics; 2017, 19, 4; 3-12
1509-409X
2450-6303
Pojawia się w:
Acta of Bioengineering and Biomechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A finite element model of the L4-L5-S1 human spine segment including the heterogeneity and anisotropy of the discs
Autorzy:
Jaramillo, H.
Gomez, L.
Garcia, J. J.
Powiązania:
https://bibliotekanauki.pl/articles/951814.pdf
Data publikacji:
2015
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
kręgosłup
metoda elementów skończonych
segment L4-L5-S1
krążek międzykręgowy
model hipersprężysty
intervertebral disc
L4-L5-S1 segment
finite element model
human spine
hyperelastic model
Opis:
With the aim to study disc degeneration and the risk of injury during occupational activities, a new finite element (FE) model of the L4-L5-S1 segment of the human spine was developed based on the anthropometry of a typical Colombian worker. Beginning with medical images, the programs CATIA and SOLIDWORKS were used to generate and assemble the vertebrae and create the soft structures of the segment. The software ABAQUS was used to run the analyses, which included a detailed model calibration using the experimental step-wise reduction data for the L4-L5 component, while the L5-S1 segment was calibrated in the intact condition. The range of motion curves, the intradiscal pressure and the lateral bulging under pure moments were considered for the calibration. As opposed to other FE models that include the L5-S1 disc, the model developed in this study considered the regional variations and anisotropy of the annulus as well as a realistic description of the nucleus geometry, which allowed an improved representation of experimental data during the validation process. Hence, the model can be used to analyze the stress and strain distributions in the L4-L5 and L5-S1 discs of workers performing activities such as lifting and carrying tasks.
Źródło:
Acta of Bioengineering and Biomechanics; 2015, 17, 2; 15-24
1509-409X
2450-6303
Pojawia się w:
Acta of Bioengineering and Biomechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On roughness measurement by angular speckle correlation
Autorzy:
Salazar, F.
Belenguer, T.
García, J.
Ramos, G.
Powiązania:
https://bibliotekanauki.pl/articles/220643.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
roughness
speckle
non-destructive testing
Opis:
In this work, the influence of both characteristics of the lens and misalignment of the incident beams on roughness measurement is presented. To investigate how the focal length and diameter affect the degree of correlation between the speckle patterns, a set of experiments with different lenses is performed. On the other hand, the roughness when the beams separated by an amount are non-coincident at the same point on the sample is measured. To conclude the study, the uncertainty of the method is calculated.
Źródło:
Metrology and Measurement Systems; 2012, 19, 2; 373-380
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Balancing Offshoring and Agility in the Apparel Industry: Lessons From Benetton and Inditex
Offshoring w przemyśle odzieżowym na przykładzie firm Benetton i Inditex
Autorzy:
Sartal, A.
Martínez-Senra, A. I.
García, J. M.
Powiązania:
https://bibliotekanauki.pl/articles/233843.pdf
Data publikacji:
2017
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
Tematy:
offshoring
agility
apparel industry
organizational innovation
time to market
przemysł odzieżowy
innowacje organizacyjne
cykl produkcyjny
Opis:
Based on a case study from the apparel industry, the paper addresses how the organizational innovations adopted by Benetton and Inditex allowed them to balance lower production costs in developing countries with an adequate response time to frequent preference changes and increasing demands for customisation. Findings confirm the fragility of multinationals whose offshoring strategy has not considered the costs of coordinating suppliers in far-off locations and suggest organisational improvements that make production costs, variety and time to market goals compatible. Our research thus provides a view of the conditions and processes that can overcome in increasingly volatile environments the misalignment between demand changes and the limited reactivity of industrial infrastructures. Furthermore the innovation strategy of textile companies has created generalizable lessons for other sectors in which demand uncertainty is high, life cycles short, and customers are, to some extent, prepared to pay for “speed to market”.
Na podstawie studium przypadku z branży odzieżowej w artykule przedstawiono, w jaki sposób innowacje organizacyjne przyjęte przez firmy Benetton i Inditex pozwoliły na obniżenie kosztów produkcji w krajach rozwijających się z zachowaniem odpowiedniego czasu reakcji na częste zmiany preferencji i rosnące wymagania klientów. Wyniki potwierdzają niestabilność firm międzynarodowych, których strategia offshoringowa nie uwzględniała kosztów koordynacji dostawców. Przeprowadzone badania pozwalają wskazać rozwiązania problemów, z którymi borykają się firmy działające w specyficznych warunkach częstej zmiany popytu i ograniczonej reaktywności infrastruktury przemysłowej. Ponadto strategia innowacyjna firm tekstylnych może być przykładem dla innych sektorów, w których panuje równie wysoka niepewność popytu i krótki cykl życia produktu.
Źródło:
Fibres & Textiles in Eastern Europe; 2017, 2 (122); 16-23
1230-3666
2300-7354
Pojawia się w:
Fibres & Textiles in Eastern Europe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical Analysis and Simulations of Quasistatic Frictionless Contact Problems
Autorzy:
Fernandez Garcia, J. R.
Han, W.
Shillor, M.
Sofonea, M.
Powiązania:
https://bibliotekanauki.pl/articles/908327.pdf
Data publikacji:
2001
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
analiza numeryczna
quasistatyka
metoda elementów skończonych
quasistatic contact
Signorini condition
normal compliance
viscoplasticity
variational inequalitie
error estimate
finite element method (FEM)
numerical approximation
Opis:
A summary of recent results concerning the modelling as well as the variational and numerical analysis of frictionless contact problems for viscoplastic materials are presented. The contact is modelled with the Signorini or normal compliance conditions. Error estimates for the fully discrete numerical scheme are described, and numerical simulations based on these schemes are reported.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2001, 11, 1; 205-222
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Environmental radiological impact by a fertilizer complex in the Ebro river (Spain)
Wpływ przemysłu produkcji nawozów sztucznych na skażenia promieniotwórcze środowiska naturalnego na przykładzie rzeki Ebro (Hiszpania)
Autorzy:
Costa, E.
Sanchez-Cabeza, J.
Garcia, J.
Masque, P.
Grimaltb, J.
Powiązania:
https://bibliotekanauki.pl/articles/340306.pdf
Data publikacji:
2004
Wydawca:
Główny Instytut Górnictwa
Tematy:
skażenie wody
rzeka Ebro w Hiszpanii
skażenie radonem
skażenie torem
water contamination
Ebro river in Spain
radon contamination
thorium contamination
Źródło:
Prace Naukowe GIG. Górnictwo i Środowisko / Główny Instytut Górnictwa; 2004, 1; 33-33
1643-7608
Pojawia się w:
Prace Naukowe GIG. Górnictwo i Środowisko / Główny Instytut Górnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Calderón-Zygmund operators and unconditional bases of weighted Hardy spaces
Autorzy:
García-Cuerva, J.
Kazarian, K.
Powiązania:
https://bibliotekanauki.pl/articles/1290466.pdf
Data publikacji:
1994
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
wavelets
splines
$H^p$ spaces
$A_p$ weights
Schauder and unconditional bases
Opis:
We study sufficient conditions on the weight w, in terms of membership in the $A_p$ classes, for the spline wavelet systems to be unconditional bases of the weighted space $H^p(w)$. The main tool to obtain these results is a very simple theory of regular Calderón-Zygmund operators.
Źródło:
Studia Mathematica; 1994, 109, 3; 255-276
0039-3223
Pojawia się w:
Studia Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A genetic algorithm for the maximum 2-packing set problem
Autorzy:
Trejo-Sánchez, Joel Antonio
Fajardo-Delgado, Daniel
Gutierrez-Garcia, J. Octavio
Powiązania:
https://bibliotekanauki.pl/articles/330154.pdf
Data publikacji:
2020
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
maximum 2-packing set
genetic algorithms
graph algorithms
algorytm genetyczny
algorytm grafowy
Opis:
Given an undirected connected graph G = (V, E), a subset of vertices S is a maximum 2-packing set if the number of edges in the shortest path between any pair of vertices in S is at least 3 and S has the maximum cardinality. In this paper, we present a genetic algorithm for the maximum 2-packing set problem on arbitrary graphs, which is an NP-hard problem. To the best of our knowledge, this work is a pioneering effort to tackle this problem for arbitrary graphs. For comparison, we extended and outperformed a well-known genetic algorithm originally designed for the maximum independent set problem. We also compared our genetic algorithm with a polynomial-time one for the maximum 2-packing set problem on cactus graphs. Empirical results show that our genetic algorithm is capable of finding 2-packing sets with a cardinality relatively close (or equal) to that of the maximum 2-packing sets. Moreover, the cardinality of the 2-packing sets found by our genetic algorithm increases linearly with the number of vertices and with a larger population and a larger number of generations. Furthermore, we provide a theoretical proof demonstrating that our genetic algorithm increases the fitness for each candidate solution when certain conditions are met.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2020, 30, 1; 173-184
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Intestinal Helminths of the red fox [Vulpes vulpes L.] in Galicia [Northwest Spain]
Jelitowe helminty lisa [Vulpes vulpes L.] w Galicji [polnocno-zachodnia Hiszpania]
Autorzy:
Alvarez, M F
Iglesias, R.
Garcia, J.
Paniagua, E.
Sanmartin, M.L.
Powiązania:
https://bibliotekanauki.pl/articles/836410.pdf
Data publikacji:
1995
Wydawca:
Polskie Towarzystwo Parazytologiczne
Tematy:
pasozyty zwierzat
Hiszpania
Vulpes vulpes
parazytologia
lis pospolity
zywiciele
tasiemce
nicienie jelitowe
Opis:
The intestinal helminth fauna of 201 specimens of Vulpes vulpes, captured in Galicia (northwest Spain), was investigated. Eight species were found: Toxocara canis (23% of host specimens), Toxocara cali (0.5%), Toxascaris leonina (1%), Uncinaria stenocephala (28%), Seuratascaris numidica (0.5%), Taenia crassiceps (23%), Mesocestoides litteralus (2.5%) and Dipylidium caninum (0.5%). We discuss possible relationships between human population density and the prevalence of infection of fox by intestinal helminths.
Źródło:
Annals of Parasitology; 1995, 41, 4; 429-442
0043-5163
Pojawia się w:
Annals of Parasitology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Intestinal Helminths of the red fox [Vulpes vulpes L.] in Galicia [Northwest Spain]
Jelitowe helminty lisa [Vulpes vulpes L.] w Galicji [północno-zachodnia Hiszpania]
Autorzy:
Alvarez, M. F.
Iglesias, R.
Garcia, J.
Paniagua, E.
Sanmartin, M. L.
Powiązania:
https://bibliotekanauki.pl/articles/2149105.pdf
Data publikacji:
1995
Wydawca:
Polskie Towarzystwo Parazytologiczne
Tematy:
pasozyty zwierzat
Hiszpania
Vulpes vulpes
parazytologia
lis pospolity
zywiciele
tasiemce
nicienie jelitowe
Opis:
The intestinal helminth fauna of 201 specimens of Vulpes vulpes, captured in Galicia (northwest Spain), was investigated. Eight species were found: Toxocara canis (23% of host specimens), Toxocara cali (0.5%), Toxascaris leonina (1%), Uncinaria stenocephala (28%), Seuratascaris numidica (0.5%), Taenia crassiceps (23%), Mesocestoides litteralus (2.5%) and Dipylidium caninum (0.5%). We discuss possible relationships between human population density and the prevalence of infection of fox by intestinal helminths.
Źródło:
Wiadomości Parazytologiczne; 1995, 41, 4; 429-442
0043-5163
Pojawia się w:
Wiadomości Parazytologiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determination of the friction coefficients of chestnut (Castanea sativa Mill.) sawn timber
Autorzy:
Villar-Garcia, J.R.
Vidal-Lopez, P.
Corbacho, A.J.
Moya, M.
Powiązania:
https://bibliotekanauki.pl/articles/2082657.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
wood
mechanical properties
friction coefficient
direct shear test
Opis:
This work provides the values of both the static and the kinetic friction coefficients for chestnut (Castanea sativa Mill.) of Spanish origin. Knowledge concerning these coefficients has its main application in the study of agroindustrial structures and machinery with timber members in contact. This determination was developed taking into account the timber anisotropy to establish surfaces and directions of slipping. A modified direct shear test device was used to conduct the tests and reproduce the tribological system. This procedure was functional and reliable and considered suitable for standardizing the friction measurement between timber surfaces, since this device is widely distributed in geotechnical and materials laboratories and the European codes do not specify a procedure or device to carry it out. The average values obtained were 0.46 for the static coefficient and 0.33 for the kinetic one, without considering the surfaces and directions of slipping. These values ranged between 0.36 and 0.55 for the static friction coefficient and between 0.28 and 0.39 for the kinetic friction coefficient depending on the direction considered and also taking into account the anisotropy of the timber. A good correlation was obtained between both coefficients, thus allowing for the estimation of the kinetic coefficient from the static one.
Źródło:
International Agrophysics; 2020, 34, 1; 65-77
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Patient classification algorithm at urgency care area of a hospital based on the triage system
Autorzy:
Mondragon, N.
Istrate, D.
Wegrzyn-Wolska, K.
Garcia, J. C.
Sanchez, J.C.
Powiązania:
https://bibliotekanauki.pl/articles/951692.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
Tematy:
triage
classification
SET
fuzzy logic
decision trees
patients
urgency
hospital emergency
algorithm
ocena stanu zdrowia rannych
klasyfikacja
logika rozmyta
drzewa decyzyjne
pacjenci
pomoc szpitalna
algorytm
Opis:
The time passed in the urgency zone of a hospital is really important, and the quick evaluation and selection of the patients who arrive to this area is essential to avoid waste of time and help the patients in a higher emergency level. The triage, an evaluation and classification structured system, allows to manage the urgency level of the patient; it is based on the vital signs measures and clinical data of the patient. The goal is making the classification in the shortest possible time and with a minimal error percentage. Levels are allocated according to the concept that what is urgent is not always serious and that what is serious is not always urgent. In this work, we present a computational algorithm that evaluates the patients within the fever symptomatic category, we use fuzzy logic and decision trees to collect and analyze simultaneously the vital signs and the clinical data of the patient through a graphical interface; so that the classification can be more intuitive and faster. Fuzzy logic allows us to process data and take a decision based on incomplete information or uncertain values, decision trees are structures or rules sets that classify the data when we have several variables.
Źródło:
Journal of Medical Informatics & Technologies; 2013, 22; 87-94
1642-6037
Pojawia się w:
Journal of Medical Informatics & Technologies
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study of dual-fuel (diesel + natural gas) particle matter and CO2 emissions of a heavy-duty diesel engine during transient operation
Autorzy:
Barroso, P.
Ribas, X.
Pita, M.
Dominguez, J.
De Seia, E.,
García, J.-M.
Powiązania:
https://bibliotekanauki.pl/articles/134220.pdf
Data publikacji:
2013
Wydawca:
Polskie Towarzystwo Naukowe Silników Spalinowych
Tematy:
dual fuel
natural gas
diesel engine
heavy-duty
transient
particle matter
CO2
silnik dwupaliwowy
gaz ziemny
silnik spalinowy
cząstki stałe
dwutlenek węgla
Opis:
The aim of this study is to describe the impact on particle matter and CO2 emissions of converting an existing heavy-duty diesel engine for on-highway truck applications to a dual-fuel engine (diesel + natural gas), especially in transient operation. A dual-fuel engine with homogeneous gas charge injection in the intake line before turbocharger was considered. The results showed the feasibility of this kind of technology for transient operation reaching a significant reduction of particle matter plus a decrement in CO2 emissions at the expense of a small decrement of brake fuel conversion efficiency and an increment of unburned hydrocarbons in the exhaust gases.
Źródło:
Combustion Engines; 2013, 52, 2; 3-11
2300-9896
2658-1442
Pojawia się w:
Combustion Engines
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Off-Diagonal Magnetoimpedance Dependence of Magnetostriction and Anisotropy in Co-Based and Fe-Based Amorphous Ribbons
Autorzy:
Sánchez, T.
García, J.
Santos, J.
Escoda, Ll.
Prida, V.
Sánchez, M.
Suñol, J.
Hernando, B.
Powiązania:
https://bibliotekanauki.pl/articles/1507012.pdf
Data publikacji:
2010-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.30.Gw
75.50.Kj
75.60.Ch
Opis:
The object of this work is the comparison of domain structure and off-diagonal magnetoimpedance effect in amorphous ribbons with different magnetostriction coefficient. The $Co_{66}Fe_4Ni_1Si_{15}B_{14}$ and $Fe_{80}B_{20}$ samples were obtained by melt-spinning. During the quenching procedure a 0.07 T transverse magnetic field was applied to some of the samples. Domain patterns obtained by the Bitter technique confirm that the differences on the samples are related to the different anisotropy and magnetostriction coefficient, and the quenching procedure. Small changes on the anisotropy distribution and the magnetostriction coefficient can be detected by the off-diagonal impedance spectra as a consequence of the different permeability values of the samples.
Źródło:
Acta Physica Polonica A; 2010, 118, 5; 756-758
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Short-term effects of spent coffee grounds on the physical properties of two Mediterranean agricultural soils
Autorzy:
Cervera-Mata, A.
Martin-Garcia, J.M.
Delgado, R.
Parraga, J.
Sanchez-Maranon, M.
Delgado, G.
Powiązania:
https://bibliotekanauki.pl/articles/2082515.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
organic amendment
soil aggregate stability
soil water retention
soil aggregate size
SEM images
Opis:
We investigated the short-term effects of spent coffee grounds on the physical properties of two Mediterranean agricultural soils (Calcisol and Luvisol). The in vitro assay was performed with two spent coffee grounds doses (60 and 240 Mg ha-1), two incubation times (30 and 60 days) and two modalities: with and without lettuce seedlings (Lactuca sativa var. longifolia). Spent coffee grounds addition increased water retention at -33 and -1500 kPa, and decreased bulk density and plant-available water content. With spent coffee grounds, the percentage of macroaggregates increased, the percentage of meso- and microaggregates decreased and the structural stability of all types of aggregates increased. The stereomicroscopy images showed that: the structural aggregates were rounded, the porosity increased by 316%, the structure was ordered into smaller aggregates, the incorporation of spent coffee grounds particles could occur in intraped cracks and spent coffee grounds particles could act as a binding agent. Scanning electron microscopy also showed that spent coffee grounds particles interacted with mineral particles and integrated into soil structure; moreover, fungal hyphae also developed on many spent coffee grounds particles. If spent coffee grounds effects are compared with those described in the literature for other organic amendments, the same trend was observed in most of the soil physical properties although with a different intensity, principally with regard to structural stability.
Źródło:
International Agrophysics; 2019, 33, 2; 205-216
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wavelet-based Entropy Measure for Rate-Distortion Optimization in Image Coding
Autorzy:
Garcia-Alvarez, J.
Führ, H.
Castellanos-Dominguez, G.
Powiązania:
https://bibliotekanauki.pl/articles/226142.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
entropy
wavelet transform
information measure
rate distortion
Opis:
A novel method for calculation of the entropy measure in wavelet space is proposed. This perceived-based entropy measure uses a Second Order Model entropy estimator, in which the occurrence of neighbors is considered in formulation. It has the intention to allow the implementation of a more suitable measure in coding processes and a relationship between the metric and the description of perceptual features. This method is used for the Rate-Distortion optimization in order to improve the bit-allocation coding algorithm, demonstrating that the wavelet-based entropy estimates a truncation step close to the target rate. The hypothesis is founded in the effect of distortion on the coefficient allocation. Because entropy measure is a close approximation of the conditional probability of image in multiresolution space, it provides an adequate representation for the information of a Detail feature. A definition of Detail-based homogeneity variance criteria is used for the information quantity - wavelet representation space, in order to find the image that fits a given Quality Level criteria. Experimental results are obtained for artificial and natural databases.
Źródło:
International Journal of Electronics and Telecommunications; 2010, 56, 1; 25-31
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Large gypsum nodules in the Paleogene and Neogene evaporites of Spain: distribution and palaeogeographic significance
Autorzy:
Ortí, F.
Rosell, L.
Playá, E.
García-Veigas, J.
Powiązania:
https://bibliotekanauki.pl/articles/2059032.pdf
Data publikacji:
2010
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Opis:
Gypsiferous units occur along the margins of some Paleogene and Neogene basins in Spain. These units accumulated in shallow saline lakes of low ionic concentration. Other gypsiferous facies constitute outer rings of the thick, highly-saline evaporite formations that occupy the central parts of the basins. In some of these gypsum units and rings, large nodules (from 0.5 m to several metres across) of secondary gypsum that originated as replacive or displacive nodular anhydrite are present. Although these occurrences usually show a stratiform arrangement, vertical geometries are observed locally, suggesting ascending circulation of anhydritizing flows. The common characteristics of the large gypsum nodules in the various occurrences indicate that the precursor anhydrite formed in burial conditions from shallow to moderate depths. A few occurrences of large, secondary gypsum nodules in the gypsum units are linked to deep faults or diapiric structures.
Źródło:
Geological Quarterly; 2010, 54, 4; 411-422
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Measures of noncompactness and normal structure in Banach spaces
Autorzy:
García-Falset, J.
Jiménez-Melado, A.
Lloréns-Fuster, E.
Powiązania:
https://bibliotekanauki.pl/articles/1290315.pdf
Data publikacji:
1994
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
normal structure
nonexpansive mappings
measures of noncompactness
Opis:
Sufficient conditions for normal structure of a Banach space are given. One of them implies reflexivity for Banach spaces with an unconditional basis, and also for Banach lattices.
Źródło:
Studia Mathematica; 1994, 110, 1; 1-8
0039-3223
Pojawia się w:
Studia Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Carrier Diffusion in the Barrier Enabling Formation of Charged Excitons in InAs/GaAs Quantum Dots
Autorzy:
Karlsson, K. F.
Moskalenko, E. S.
Holtz, P. O.
Monemar, B.
Schoenfeld, W. V.
Garcia, J. M.
Petroff, P. M.
Powiązania:
https://bibliotekanauki.pl/articles/2028833.pdf
Data publikacji:
2001-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.67.Hc
71.35.-y
78.55.Cr
Opis:
It is demonstrated that the photoluminescence spectra of single self-assembled quantum dots are very sensitive to the experimental conditions, such as excitation energy and crystal temperature. A qualitative explanation is given in terms of the effective diffusion of the photogenerated carriers, determined by the experimental conditions, which influence the capture probability and hence also the charge state of the quantum dots. This is proposed as a new tool to populate quantum dots with extra electrons in order to study phenomena involving charged excitons.
Źródło:
Acta Physica Polonica A; 2001, 100, 3; 387-395
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The OAE1a in Cuchía (Early Aptian, Spain): C and O geochemistry and global correlation
Autorzy:
García-Mondéjar, J.
Fernández-Mendiola, P. A.
Owen, H. G.
Powiązania:
https://bibliotekanauki.pl/articles/139445.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Cretaceous
Aptian
Basque-Cantabrian Basin
C-O isotopes
TOC
kreda
apt
izotopy
Opis:
C-isotopes, TOC and O geochemical data from the lower Aptian Cuchía section in the western Basque-Cantabrian basin (BCB) allow an accurate delimitation of the OAE1a-equivalent and its geochemical Menegatti´s segments, a detailed δ13Ccarb correlation with regional and interregional sections, and a high-resolution construction of TOC and bulk-rock δ18Ocarb curves and their interpretation. The δ13Ccarb values range from -2‰ and +4‰ (VPDB). They agree with previous data from the eastern BCB sections (Aralar) confirming the ammonite age of the OAE1a in the Basque-Cantabrian basin: Deshayesites forbesi, Deshayesites deshayesi, and Deshayesites deshayesi-Dufrenoyia furcata transition Zones. Interregional δ13Ccarb correlation with pelagic (Cismon, Italy, and Mid-Pacific Mountains, DSDP Site 463) and neritic (Roquefort-La Bédoule, France) core sections, reveals a common profile of a wide negative excursion characteristic of the OAE1a. It consists of a double trough separated by a flat relative maximum, with two negative spikes in the upper trough of neritic sections. TOC absolute values range from 0.12% to 1.37%. Segments of the TOC curve with persistent low values closely correspond with descending segments of the δ13Ccarb curve, and are attributed to lesser organic productivity in the BCB. Detailed bulk-rock δ18Ocarb data (-5.71‰ to -1.05 ‰ PDB) and variation curve show two main positive O-isotope shifts and three minor positive inflections, within a general negative trend characteristic of the OAE1a. The two major positive shifts correspond to both shallowing upwards sequences and the lowermost can be related to a eustatic sea level fall. Independent interregional correlation of the O-isotope shifts with C-isotopes supports their interpretation as punctuating colder events within a general warming trend.
Źródło:
Acta Geologica Polonica; 2015, 65, 4; 525-543
0001-5709
Pojawia się w:
Acta Geologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Youngest agamid lizards from Western Europe (Sierra de Quibas, Spain, late Early Pleistocene)
Autorzy:
Blain, H.-A.
Bailon, S.
Agusti, J.
Pinero-Garcia, P.
Lozano-Fernandez, I.
Sevilla, P.
Lopez-Garcia, J.M.
Sanchez, G.R.
Mancheno, M.A.
Powiązania:
https://bibliotekanauki.pl/articles/21138.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Opis:
Here we report a new Early Pleistocene record of agamid lizards (Agamidae indet.) from the Spanish locality of Quibas (ca. 1.3–1.0 Ma), which represents the latest evidence of the family in Western Europe. Up to now, the family Agamidae was considered to have disappeared in this region at 1.8 Ma. This new record implies the survival of agamid lizards for a large part of the Early Pleistocene in the southernmost Iberian Peninsula, probably because of favourable climatic and environmental conditions. Consequently, the formerly detected Pliocene / Pleistocene boundary is no longer recognisable in the evolution of the herpetological assemblages in Western Europe.
Źródło:
Acta Palaeontologica Polonica; 2014, 59, 4
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Occurrence of a new sulphate mineral: Ca7Na3K(SO4)9 in the Emet borate deposits, western Anatolia (Turkey)
Autorzy:
García-Veigas, J.
Ortí, F.
Rosell, L.
Gündog(an, I.
Helvac, C.
Powiązania:
https://bibliotekanauki.pl/articles/2059025.pdf
Data publikacji:
2010
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Miocene
K-sulphate
emetite
glauberite
probertite
evaporites
Opis:
Emetite, a new sulphate mineral, Ca734
Źródło:
Geological Quarterly; 2010, 54, 4; 431-438
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Visualization of Atmosphere Information for Distance Education System Based on Fuzzy Inference Using Customized Knowledge
Autorzy:
Ohnishi, K.
Garcia-Sanchez, J. A.
Tang, Y.
Dong, F.
Hirota, K.
Powiązania:
https://bibliotekanauki.pl/articles/385123.pdf
Data publikacji:
2015
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:
distance education
visualization
fuzzy inference
atmosphere
POMS
Opis:
A distance education system is designed based on fuzzy inference, where visualized atmosphere information is shared by all learners in a virtual classroom. It provides high aspirations, low isolated feeling, low stress, and high affinity to learners, and offers learner’s psychological information, individual difference information, and hints of system improvement to the system manager. The effect of visualized atmosphere information in the learner’s psychological states is confirmed by T score of POMS test for 15 graduate students using CAI contents, and comparison experiment with traditional distance education. The proposal of atmosphere information presentation of virtual classroom provides a first step in establishing Education Academy beyond Space Time (EAST).
Źródło:
Journal of Automation Mobile Robotics and Intelligent Systems; 2015, 9, 3; 18-24
1897-8649
2080-2145
Pojawia się w:
Journal of Automation Mobile Robotics and Intelligent Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Using visual and force information in robot-robot cooperation to build metallic structures
Autorzy:
Pomares, J.
Gil, P.
Corrales, J. A.
Garcia, G. J.
Puente, S. T.
Torres, F.
Powiązania:
https://bibliotekanauki.pl/articles/384655.pdf
Data publikacji:
2009
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Opis:
In this paper, a cooperative robot-robot approach to construct metallic structures is presented. In order to develop this task, a visual-force control system is proposed. The visual information is composed of an eye-in-hand camera, and a time of flight 3D camera. Both robots are equipped by a force sensor at the end-effector. In order to allow a human cooperate with both robots, an inertial motion capture system and an indoor localization system are em ployed. This multisensorial approach allows the robots to cooperatively construct the metallic structure in a flexible way and sharing the workspace with a human operator.
Źródło:
Journal of Automation Mobile Robotics and Intelligent Systems; 2009, 3, 3; 96-101
1897-8649
2080-2145
Pojawia się w:
Journal of Automation Mobile Robotics and Intelligent Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Turtle tracks from the Late Jurassic of Asturias, Spain
Autorzy:
Avanzini, M
Garcia-Ramos, J.C.
Lires, J.
Menegon, M.
Pinuela, L.
Fernandez, L.A.
Powiązania:
https://bibliotekanauki.pl/articles/20797.pdf
Data publikacji:
2005
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Opis:
Although tracks of dinosaurs are well known from Upper Jurassic sediments, tracks of non−dinosaurian vertebrates are fairly rare. The Upper Jurassic Lastres Formations of Asturias in northern Spain contain many vertebrate tracksites that include footprints and trackways of non−dinosaurian tetrapods. Several of these tracks are natural casts of pentadactyl to tridactyl footprints with digits connected by arched structures. The digits are short with deep scratch marks oriented anteriorly. The Asturian tracks show a high degree of morphological similarity to other specimens previously described as possible turtle tracks. Observations from extant turtle trackways show some surprising similarities with the fossil material. The tracks are here interpreted as having been made by turtles partially buoyed by water or by turtles walking in a slightly wet subaerial environment.
Źródło:
Acta Palaeontologica Polonica; 2005, 50, 4; 743-755
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Microstructure and Properties of TiC/Ti Coatings Deposited by the Supersonic Cold Gas Spray Technique
Autorzy:
Kusiński, J.
Kac, S.
Kowalski, K.
Dosta, S.
Georgiou, E. P.
Garcia-Forgas, J.
Matteazzi, P.
Powiązania:
https://bibliotekanauki.pl/articles/356608.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
cold gas spraying
Ti
TiC
CerMet coating
SEM
TEM
wear resistance
Opis:
Nanostructured, biocompatible, TiC/Ti Supersonic Cold Gas Sprayed coatings were deposited onto a Ti6Al4V alloy and their microstructure, wear resistance and hardness were investigated. The starting nanostructured powder, containing a varied mixture of Ti and TiC particles, was produced by high energy ball milling. Scanning and transmission electron microscopy, energy-dispersive X-ray spectroscopy, and X-ray diffraction were used for structural and chemical analyses of powder particles and coatings. Coatings, 250-350 μm thick, preserving the nanostructure and chemical powder composition, with low porosity and relatively high hardness (~850 HV), were obtained. These nanostructured TiC/Ti coatings exhibited better tribological properties than commonly used biomedical benchmark materials, due to an appropriate balance of hard and soft nano-phases.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 2; 867-873
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Air-spore in Cartagena, Spain: Viable and non-viable sampling methods
Autorzy:
Elvira-Rendueles, B.
Moreno, J.
Garcia-Sanchez, A.
Vergara, N.
Martinez-Garcia, M.J.
Moreno-Grau, S.
Powiązania:
https://bibliotekanauki.pl/articles/51349.pdf
Data publikacji:
2013
Wydawca:
Instytut Medycyny Wsi
Źródło:
Annals of Agricultural and Environmental Medicine; 2013, 20, 4
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Point-Contact Spectroscopy of Ce$\text{}_{1-x}$RE$\text{}_{x}$Ni$\text{}_{5}$ (RE = Pr, Nd)
Autorzy:
Kačmárová, T.
Reiffers, M.
Garcia Soldevilla, J.
Goméz Sal, J. C.
Espeso, J. I.
Blanco, J. A.
Powiązania:
https://bibliotekanauki.pl/articles/2013409.pdf
Data publikacji:
2000-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.40.Jn
71.70.Ch
71.70.Gm
Opis:
We report on the study of the electron-quasiparticle interaction function in Ce$\text{}_{1-x}$RE$\text{}_{x}$ Ni$\text{}_{5}$ (RE = Pr, Nd) pseudobinary compounds for x = 0, 0.2, 0.5, 0.8, and 1 measured by means of point-contact spectroscopy. The measured point-contact spectra (d$\text{}^{2}$V/dI$\text{}^{2}$ - directly proportional to the electron- quasiparticle interaction function) of the heterocontacts between Ce$\text{}_{1-x}$ RE$\text{}_{x}$Ni$\text{}_{5}$ and Cu in the ballistic regime are presented.zapisz i p
Źródło:
Acta Physica Polonica A; 2000, 97, 5; 795-798
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Linking Traits and Personal Constructs: An Exploratory Study throughout Levels of Personality
Autorzy:
Martínez, Jesús García
Cano-García, Francisco J.
Rodríguez-Franco, Luis
Buero-Gallego, Milagros
Alcocer-Gómez, Elísabet
Guerrero-Gómez, Rafael
Powiązania:
https://bibliotekanauki.pl/articles/2128612.pdf
Data publikacji:
2019-03-28
Wydawca:
Katolicki Uniwersytet Lubelski Jana Pawła II. Towarzystwo Naukowe KUL
Tematy:
Personality
Levels of Personality
Traits
Personal Constructs
Big Five Model
Repertory Grid Technique
McAdams’ Model
Implicative Dilemmas
Opis:
This article presents a preliminary study of links between personal constructs and traits. The conceptual framework for this study is the domains of personality model postulated by McAdams (1995) and McAdams & Pals (2006), and we tried to find concomitances between variables of two different levels, the dispositional level and the identity level. A repertory grid and the NEOFFI inventory were distributed to a total of 273 individuals, 146 representing the general population, and 137 having pathologies. By applying an exploratory design ex post facto in which Pearson’s correlations and ANOVAs were used, we found associations between the content of the constructs used and the traits. The neuroticism trait was most closely related to the content of the constructs. There were also clear associations between construct structure and scores on traits. Neurotic subjects were more rigid, whereas agreeable and conscientious subjects were more complex. However, the type of sample (normal or pathological) is a basic modulator of the relationships between constructs and traits.
Łączenie cech i konstruktów osobistych. Eksploracyjne studium poziomów osobowości This article presents a preliminary study of links between personal constructs and traits. The conceptual framework for this study is the domains of personality model postulated by McAdams (1995) and McAdams & Pals (2006), and we tried to find concomitances between variables of two different levels, the dispositional level and the identity level. A repertory grid and the NEOFFI inventory were distributed to a total of 273 individuals, 146 representing the general population, and 137 having pathologies. By applying an exploratory design ex post facto in which Pearson’s correlations and ANOVAs were used, we found associations between the content of the constructs used and the traits. The neuroticism trait was most closely related to the content of the constructs. There were also clear associations between construct structure and scores on traits. Neurotic subjects were more rigid, whereas agreeable and conscientious subjects were more complex. However, the type of sample (normal or pathological) is a basic modulator of the relationships between constructs and traits.
Źródło:
Roczniki Psychologiczne; 2009, 12, 1; 57-80
1507-7888
Pojawia się w:
Roczniki Psychologiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Anisotropy of the Electrical Resistivity and Thermal Expansion of Single Crystal DyNi$\text{}_{5}$
Autorzy:
Kačmarčiková, E.
Reiffers, M.
Mihálik, M.
Kováč, J.
Menovsky, A.
Garcia Soldevilla, J.
Señas Pariente, A.
Goméz Sal, J. C.
Powiązania:
https://bibliotekanauki.pl/articles/2013656.pdf
Data publikacji:
2000-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.15.Eb
65.70.+y
71.70.Gm
Opis:
The results of the measurements of temperature dependence of the electrical resistivity ρ(T), thermal expansion L(T) and susceptibility χ(T) on single crystal DyNi$\text{}_{5}$ in the temperature range 4.2-300 K are reported. The maximum in ρ(T) at T$\text{}_{N}$=12.2 K was observed which corresponds to the transition to antiferromagnetically ordered state. Taking into account the Bloch-Grüneisen formula for electron-phonon contribution ρ$\text{}_{ph}$(T) to ρ(T) the anisotropic magnetic contribution ρ$\text{}_{mag}$(T) was determined. We also observed the anisotropic behaviour of L(T) at low temperatures.
Źródło:
Acta Physica Polonica A; 2000, 97, 5; 811-814
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Towards the production of microalgae biofuels: the effect of the culture medium on lipid deposition
Autorzy:
Cuellar Garcia, D.J.
Rangel-Basto, Y.A.
Barajas-Solano, A.F.
Munoz-Penalosa, Y.A.
Urbina-Suarez, N.A.
Powiązania:
https://bibliotekanauki.pl/articles/80961.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
biomass production
biofuel
microalga
alga
Chlorella vulgaris
Scenedesmus obliquus
renewable source
culture medium
lipid accumulation
Źródło:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2019, 100, 3
0860-7796
Pojawia się w:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Anderson Localization in Quantum Chaos: Scaling and Universality
Autorzy:
García-García, A. M.
Wang, J.
Powiązania:
https://bibliotekanauki.pl/articles/2047824.pdf
Data publikacji:
2007-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.15.Rn
71.30.+h
05.45.Df
05.40.-a
Opis:
The one-parameter scaling theory is a powerful tool to investigate Anderson localization effects in disordered systems. In this paper we show that this theory can be adapted to the context of quantum chaos provided that the classical phase space is homogeneous, not mixed. The localization problem in this case is defined in momentum, not in real space. We then employ the one-parameter scaling theory to: (a) propose a precise characterization of the type of classical dynamics related to the Wigner-Dyson and Poisson statistics which also predicts in which situations Anderson localization corrections invalidate the relation between classical chaos and random matrix theory encoded in the Bohigas-Giannoni-Schmit conjecture, (b) to identify the universality class associated with the metal-insulator transition in quantum chaos. In low dimensions it is characterized by classical superdiffusion, in higher dimensions it has in general a quantum origin as in the case of disordered systems. We illustrate these two cases by studying 1d kicked rotors with non-analytical potentials and a 3d kicked rotor with a smooth potential.
Źródło:
Acta Physica Polonica A; 2007, 112, 4; 635-653
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Criteria for environmental pollution of the industrial and mining areas assessment in Spain
Autorzy:
Grima, J.
Garcia, R.
Powiązania:
https://bibliotekanauki.pl/articles/1182784.pdf
Data publikacji:
2008
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
gleba
standardy jakości
obszary przemysłowe
obszary górnicze
odpady
soil
groundwater
quality standards
industrial areas
mining areas
wastes
Opis:
Parlament Europejski upoważnił Komisję Europejską do przygotowania strategii ochrony gleb, która uwzględniałaby kroki prewencyjne oraz odpowiednie ograniczenia i redukcję wpływu działalności ludzkiej na gleby. W Hiszpanii Rozporządzenie Królewskie 9/2005 z 14 stycznia spełnia założenia Prawa o Odpadach 10/1998 z 21 kwietnia i ustala listę potencjalnych zanieczyszczeń, a także kryteria i standardy pozwalające uznać dany teren, po konsultacji z lokalnym samorządem, za zanieczyszczony. Rozporządzenie Królewskie nie dotyczy terenów publicznych zajętych przez instalacje militarne. Ministerstwo Obrony przygotuje program dekontaminacji tych terenów, po konsultacji z Ministerstwem Środowiska. Brak jest kryteriów prawnych dla oceny zanieczyszczenia środowiska spowodowanego przez odpady przemysłu wydobywczego. W tym przypadku dalsze rozwiązania prawne będą musiały opierać się na przyszłej Dyrektywie Parlamentu Europejskiego i Rady Europejskiej w sprawie odpadów przemysłu wydobywczego. Dyrektywa ta przedstawi środki, procedury oraz przepisy dotyczące działań prewencyjnych lub maksymalnie ograniczających możliwe negatywne wpływy na środowisko oraz możliwe ryzyko dla ludzkiego zdrowia powodowane przez odpady przemysłu wydobywczego i przez ich składowanie i wykorzystywanie. Jeśli chodzi o wody podziemne, to ustalone są tylko standardy dotyczące wód pitnych. Tym niemniej, liczne inicjatywy narodowe i europejskie podniosły sprawę oceny chemicznego stanu wód podziemnych. Oparła się ona na istniejących jakościowych standardach Wspólnoty (azotany, pestycydy oraz biocydy) oraz na wymaganiach poszczególnych państw członkowskich dotyczących określania substancji zanieczyszczających oraz wartości granicznych, powyżej których wody podziemne uznawane są za zagrożone, zgodnie zresztą z zaleceniami Ramowej Dyrektywy Wodnej. Zgodnie z propozycją Dyrektywy Wód Podziemnych wartości graniczne określane w obrębie krajowych dorzeczy lub ciał wód podziemnych wykorzystywane są dla określania dobrego poziomu chemicznego wód podziemnych.
Źródło:
Polish Geological Institute Special Papers; 2008, 24; 55-62
1507-9791
Pojawia się w:
Polish Geological Institute Special Papers
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessing a moderating effect and the global fit of a PLS model on online trading
Ocena łagodzącego efektu i testów zgodności modelu PLS w obrocie produktami finansowymi z wykorzystaniem internetu
Autorzy:
García-Machado, Juan J.
Powiązania:
https://bibliotekanauki.pl/articles/1342201.pdf
Data publikacji:
2017
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
Tematy:
e-Business
e-commerce
Goodness of Fit Measures Moderating Effect
Online trading
PLS-SEM
e-biznes
e-handel
efekt łagodzący
marketing
obrót handlowy przez Internet
test zgodności
Opis:
This paper proposes a PLS Model for the study of Online Trading. Traditional investing has experienced a revolution due to the rise of e-trading services that enable investors to use Internet conduct secure trading. On the hand, model results show that there is a positive, direct and statistically significant relationship between personal outcome expectations, perceived relative advantage, shared vision and economy-based trust with the quality of knowledge. On the other hand, trading frequency and portfolio performance has also this relationship. After including the investor’s income and financial wealth (IFW) as moderating effect, the PLS model was enhanced, and we found that the interaction term is negative and statistically significant, so, higher IFW levels entail a weaker relationship between trading frequency and portfolio performance and vice-versa. Finally, with regard to the goodness of overall model fit measures, they showed that the model is fit for SRMR and dG measures, so it is likely that the model is true.
W niniejszym artykule posługujemy się modelem PLS w celu przeprowadzenia badania nad obrotem produktami finansowymi przy wykorzystaniu Internetu. Tradycyjny sposób inwestowania przeszedł swoistą rewolucję ze względu na rosnącą skalę bezpiecznych usług transakcyjnych świadczonych drogą internetową. Z jednej strony uzyskane wyniki wskazują na istnienie dodatniego, bezpośredniego i istotnego statystycznie związku między osobistymi oczekiwaniami co do wyniku, postrzeganą przewagą względną, wspólną wizją, zaufaniem do gospodarki oraz posiadanej wiedzy wysokiej jakości. Z drugiej strony zależność taką wykazują też częstotliwość transakcji oraz wydajność portfelowa. Model PLS rozszerzono uwzględniając dochody i finansowy majątek inwestora jako efekt łagodzący i okazało się, że stopień interakcji jest ujemny i statystycznie istotny, czyli przy podwyższonych poziomach dochodów i majątku inwestora zauważa się słabszą zależność pomiędzy częstotliwością transakcji i wydajnością portfelową oraz vice versa. Także w odniesieniu do testów zgodności metod wykazano, że model ten nadaje się do SRMR oraz dG, co oznacza, że prawdopodobnie model ten jest prawdziwy.
Źródło:
Marketing Instytucji Naukowych i Badawczych; 2017, 4(26); 1-34
2353-8414
Pojawia się w:
Marketing Instytucji Naukowych i Badawczych
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sequential extraction of uranium isotopes in sediments from an estuary historically affected by anthropogenic inputs of natural radionuclides
Sekwencyjna ekstrakcja izotopów uranu z osadów estuariowych, skażonych naturalnymi izotopami promieniotwórczymi pochodzenia antropogenicznego
Autorzy:
Aguadol, J.
Bolivar, J.
Garcia-Tenorio, R.
Powiązania:
https://bibliotekanauki.pl/articles/340210.pdf
Data publikacji:
2004
Wydawca:
Główny Instytut Górnictwa
Tematy:
izotopy uranu
spektrometria alfa
specjacja
osady
TENORM
U-isotopes
α-particle spectrometry
alpha-particle spectrometry
speciation
sediments
Źródło:
Prace Naukowe GIG. Górnictwo i Środowisko / Główny Instytut Górnictwa; 2004, 1; 64-64
1643-7608
Pojawia się w:
Prace Naukowe GIG. Górnictwo i Środowisko / Główny Instytut Górnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dynamism patterns of western Mediterranean cruise ports and the coopetition relationships between major cruise ports
Autorzy:
Esteve-Perez, J.
Garcia-Sanchez, A.
Powiązania:
https://bibliotekanauki.pl/articles/258786.pdf
Data publikacji:
2018
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
cruise ports
Mediterranean ports
hierarchic patterns
coopetition
shift-share analysis
Opis:
The Mediterranean Sea has seen an increase of ports hosting cruise ships during the first fifteen years of the 21st century. The increase in cruise ship presence in Mediterranean ports is associated with the dynamism of cruise traffic in recent years, with an average annual growth of 7.45% for cruise passengers worldwide during the period of 1990-2015. Cruise traffic is a maritime business that is primarily composed of two elements, maritime affairs and tourism. This article focuses on the maritime component. With the growth of the cruise industry, cruise lines have been forced to seek new ports to meet demand in an attempt to create differentiated products based on the ports that compose the itinerary. The itinerary system of cruise traffic makes the cruise ports depend on one another to design an itinerary. This feature results in both complex geographic relationships in the design of a cruise itinerary and complex competitive/cooperative relationships between ports. The aim of this article is to present the hierarchic picture of a sample of 29 cruise ports in the Western Mediterranean region during the period of 2000-2015. To achieve this goal, a port size classification is proposed and a shift-share analysis at the inter- and intra-group size level is applied. Moreover, concentration measures are used to determine the changes in the levels of market concentration. Furthermore, a dynamic model is proposed to determine the competitive or cooperative relationships between cruise ports. The proposed model is applied to the largest ports with data from the 2001-2015 period.
Źródło:
Polish Maritime Research; 2018, 1; 51-60
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Joule Heating Preannealing Effect in the Coercivity Field and Magnetostriction Constant of Co$\text{}_{66}$Fe$\text{}_{4}$Mo$\text{}_{2}$Si$\text{}_{16}$B$\text{}_{12}$ Alloy
Autorzy:
Garcia Tello, P.
González, J.
Blanco, J.
Żuberek, R.
Powiązania:
https://bibliotekanauki.pl/articles/2013239.pdf
Data publikacji:
2000-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Kj
75.30.Gw
75.80.+q
Opis:
The effect of thermal treatments (by the Joule heating and conventional annealing) on the coercivity and saturation magnetostriction constant in the amorphous and nanocrystalline Co$\text{}_{66}$Fe$\text{}_{4}$Mo$\text{}_{2}$Si$\text{}_{16}$B$\text{}_{12}$ alloy is reported. It is noticeable the near insensibility to the external stress of coercive field and anisotropy field (leading to extremely low value of magnetostriction 1.5×10$\text{}^{-8}$) achieved after the Joule heating by two steps (first one to relax the internal stresses and the second one to develop a fine nanocrystalline structure).
Źródło:
Acta Physica Polonica A; 2000, 97, 3; 595-598
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On the extraction of threshold voltage, effective channel length and series resistance of MOSFETs
Autorzy:
Ortiz-Conde, A.
Garcia Sánchez, F.J.
Liou, J.J.
Powiązania:
https://bibliotekanauki.pl/articles/309320.pdf
Data publikacji:
2000
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
threshold voltage
channel length
series resistance
parameter extraction
Opis:
The first part of this article presents the modeling of the long-channel bulk MOSFET as a particular case of the SOI MOSFET. The second part reviews compares and scrutinizes various methods to extract the threshold voltage, the effective channel and the individual values of drain and source resistances. These are important device parameters for modeling and circuit simulation.
Źródło:
Journal of Telecommunications and Information Technology; 2000, 3-4; 43-58
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Phenological changes in olive (Ola europaea L.) reproductive cycle in southern Spain due to climate change
Autorzy:
Garcia-Mozo, H.
Oteros, J.
Galan, C.
Powiązania:
https://bibliotekanauki.pl/articles/51237.pdf
Data publikacji:
2015
Wydawca:
Instytut Medycyny Wsi
Źródło:
Annals of Agricultural and Environmental Medicine; 2015, 22, 3
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Crural bases position as a structural criterion for supraspecific diagnosis of Early Jurassic zeilleriid brachiopods
Autorzy:
Baeza-Carratala, J.F.
Garcia Joral, F.
Powiązania:
https://bibliotekanauki.pl/articles/945875.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
paleontology
Brachiopoda
Zeilleriidae
systematics
structural criterion
supraspecific diagnosis
Jurassic
Early Jurassic
zeilleriid brachiopod
brachiopod
Opis:
Analysis of the internal structure carried out on several representative genera of the brachiopod family Zeilleriidae from the Lower Jurassic of the Betic Ranges (SE Spain), complemented with specimens from nearby domains such as the Iberian Range and Lusitanian Basin, has enabled to propose a model for discrimination of genera based on the relative position of the crural bases with respect to the hinge plates. This particular feature has been analysed in the genera Zeilleria, Bakonyithyris, Securina, Neozeilleria, Cincta, Aulacothyris, and Plesiothyris, revealing three different basic patterns of crural bases arrangement: a Zeilleria-type, with crural bases distinctly arising from the ventral side of the hinge plates; a Securina-type, with crural bases originating transversally to the hinge plates and dorsally prominent; and a Bakonyithyris-type, intermediate between both previous patterns.
Źródło:
Acta Palaeontologica Polonica; 2014, 59, 3; 651-661
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ocena skuteczności procesu ozonowania katalitycznego z udziałem dwutlenku manganu na przykładzie wodnego roztworu 2-chloro-4-nitrofenolu (CNP)
Efficacy assessment of manganese dioxide assisted catalytic ozonation in the example of 2-chloro-4-nitrophenyl (CNP)
Autorzy:
Andrzejewski, P.
Herrero, J.
Garcia-Consuegra, U. L.
Powiązania:
https://bibliotekanauki.pl/articles/237446.pdf
Data publikacji:
2013
Wydawca:
Polskie Zrzeszenie Inżynierów i Techników Sanitarnych
Tematy:
ozon
katalityczne utlenianie
CNP
dwutlenek manganu
ozone
catalytic ozonation
manganese dioxide
Opis:
W literaturze brakuje jednoznacznej oceny skuteczności procesu ozonowania katalitycznego na tlenkach metali, w tym dwutlenku manganu. Część prac zaprzecza kata-litycznej roli tlenków metali, natomiast inne ją potwierdzają. Z tego względu przeprowadzono porównawcze badania skuteczności ozonowania katalitycznego z udziałem dwutlenku manganu i ozonowania klasycznego. Związkiem poddawanym degradacji był 2-chloro-4-nitrofenolu (CNP). Zarówno obecność atomu chloru, jak i grupy nitrowej w pierścieniu aromatycznym tego związku skutkuje jego wysoką odpornością na degradację. Zbuforowany roztwór modelowy zawierający CNP w ilości 25 g/m3 poddawano ozonowaniu w reaktorze przez 20 min (próbki pobierano do 60. minuty reakcji), przy różnych wartościach pH, zarówno przy braku, jak i w obecności dwutlenku manganu w postaci suspensji. Wykazano, że CNP ulegał degradacji (maks. 40%) zarówno w procesie klasycznego, jak i katalitycznego ozonowania, przy czym skuteczność tego ostatniego była wyraźnie większa przy pH=7 niż przy pH=8. Ponadto stwierdzono, że degradacja CNP praktycznie ustawała po zakończeniu dawkowania ozonu, gdyż nie odnotowano dalszego ubytku CNP w czasie.
Available literature provides inconclusive assessment of efficacy of metal oxide assisted (manganese dioxide including) ozonation process. Some study results negate catalytic role of metal oxides, while other research confirms it. Therefore, comparative studies assessing efficacy of manganese dioxide assisted catalytic ozonation and of a standard procedure were performed. 2-chloro-4-nitrophenyl (CNP) was chosen for the experiments. Both chlorine atom and nitro group in aromatic ring of the compound determine its high resistance to degradation. Buffered, CNP-containing (25 g/m3) model solution was ozonated in the reactor for 20 min (samples withdrawn up to 60 min) at varied pH and with or without manganese dioxide in suspension. It was demonstrated that CNP was degraded (up to 40%), both in standard and catalytic ozonation, while the efficacy of the latter was insignificantly higher at pH=7 than pH=8. Additionally, CNP degradation was demonstrated to cease when ozone dosing stopped. No further time-dependent CNP depletion was observed.
Źródło:
Ochrona Środowiska; 2013, 35, 4; 57-60
1230-6169
Pojawia się w:
Ochrona Środowiska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Retention of two dialkyl alkylphosphonates and a phosphoramidate utilized as chemical weapons agents simulants in a polyurethane rubber matrix
Zatrzymywanie w gumie poliuretanowej dwóch dialkiloalkilofosfonianów i fosforoamidu stosowanych jako symulanty bojowych środków trujących
Autorzy:
Gavilán Garcia, I.
Gimenez, D.
Quagliano, J. C.
Powiązania:
https://bibliotekanauki.pl/articles/271189.pdf
Data publikacji:
2013
Wydawca:
Centralny Ośrodek Badawczo-Rozwojowy Aparatury Badawczej i Dydaktycznej, COBRABiD
Tematy:
chemical weapons agent simulant
polyurethane rubber
retention
symulanty bojowych środków chemicznych
bojowe środki chemiczne
guma poliuretanowa
zatrzymywanie
Opis:
In this article we report the retention of two dialkyl alkylphosphonates and a phosphoramidate in a polybutadiene-based polyurethane rubber matrix. Two dialkyl akylphosphonates, which are degradation products of nerve chemical weapons agent (CWA) and a phosphoramidate, were tested in this study for penetration into the rubber matrix. They are often used as a symulant of CWA. One of the dialkyl alkylphosphonates and the phosphoramidate were synthesized and the rubber matrix was challenger with these chemicals for retention and penetration using three different thickness of barrier material. Under the experimental conditions tested, no penetration of chemical simulants on the rubber was observed. Our results suggested that this polyurethane matrix could be a potential barrier material for protection against CWA.
Opisano zatrzymywanie dwóch dialkiloalkilofosfonianow i fosforoamidu w gumie polbutadienowopoliuretanowej. Dwa dialkiloalkilofosfoniany, które są produktami degradacji bojowych środków trujących (BST) z grupy trucizn nerwów i fosforoamidu badano pod kątem ich wnikania do gumy. Przeprowadzono syntezę jednego dialkiloalkilofosfonianu i fosforoamidu, które wraz z handlowym dialkiloalkilofosfonianem nanoszono na gumę w celu określenia ich zatrzymywania oraz przenikania stosując różne grubości gumy. W warunkach doświadczenia nie stwierdzono przenikania symulatorów przez gumę. Otrzymane wyniki pozwalają sądzić, że guma poliuretanowa może być stosowana do ochrony przed BST.
Źródło:
Aparatura Badawcza i Dydaktyczna; 2013, 18, 3; 223-228
2392-1765
Pojawia się w:
Aparatura Badawcza i Dydaktyczna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Soft-part preservation in two species of the arthropod Isoxys from the middle Cambrian Burgess Shale of British Columbia, Canada
Autorzy:
Garcia-Bellido, D.C.
Vannier, J.
Collins, D.
Powiązania:
https://bibliotekanauki.pl/articles/945908.pdf
Data publikacji:
2009
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
arthropoda
isoxys
“great appendage”
burgess shale
lagerstätten
cambrian
Opis:
More than forty specimens from the middle Cambrian Burgess Shale reveal the detailed anatomy of Isoxys, a worldwide distributed bivalved arthropod represented here by two species, namely Isoxys acutangulus and Isoxys longissimus. I. acutangulus had a non−mineralized headshield with lateral pleural folds (= “valves” of previous authors) that covered the animal’s body almost entirely, large frontal spherical eyes and a pair of uniramous prehensile appendages bearing stout spiny outgrowths along their anterior margins. The 13 following appendages had a uniform biramous design—i.e., a short endopod and a paddle−like exopod fringed with marginal setae with a probable natatory function. The trunk ended with a flap−like telson that protruded beyond the posterior margin of the headshield. The gut of I. acutangulus was tube−like, running from mouth to telson, and was flanked with numerous 3D−preserved bulbous, paired features interpreted as digestive glands. The appendage design of I. acutangulus indicates that the animal was a swimmer and a visual predator living off−bottom. The general anatomy of Isoxys longissimus was similar to that of I. acutangulus although less information is available on the exact shape of its appendages and visual organs. I. longissimus is characterized by extremely long anterior and posterior spines. There are now seven Isoxys species known with soft−part preservation, I. acutangulus, I. longissimus from the Burgess Shale, I. auritus and I. curvirostratus from the Maotianshan Shale of China, I. communis and I. glaessneri from the Emu Bay Shale of Australia and I. volucris from Sirius Passet in Greenland. The frontal appendages of Isoxys strongly resemble those of other Cambrian arthropods, characterized by a single pair of “great appendages” with a shared prehensile function yet some variability in length and shape.
Źródło:
Acta Palaeontologica Polonica; 2009, 54, 1
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Soft-part preservation in two species of the arthropod Isoxys from the middle Cambrian Burgess Shale of British Columbia, Canada
Autorzy:
Garcia-Bellido, D.C.
Vannier, J.
Collins, D.
Powiązania:
https://bibliotekanauki.pl/articles/20887.pdf
Data publikacji:
2009
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
arthropod
Isoxys
Middle Cambrian
Cambrian
Burgess Shale
British Columbia
Canada
Arthropoda
Isoxys acutangulus
Isoxys longissimus
paleontology
fossil
Opis:
More than forty specimens from the middle Cambrian Burgess Shale reveal the detailed anatomy of Isoxys, a worldwide distributed bivalved arthropod represented here by two species, namely Isoxys acutangulus and Isoxys longissimus. I. acutangulus had a non−mineralized headshield with lateral pleural folds (= “valves” of previous authors) that covered the animal’s body almost entirely, large frontal spherical eyes and a pair of uniramous prehensile appendages bearing stout spiny outgrowths along their anterior margins. The 13 following appendages had a uniform biramous design—i.e., a short endopod and a paddle−like exopod fringed with marginal setae with a probable natatory function. The trunk ended with a flap−like telson that protruded beyond the posterior margin of the headshield. The gut of I. acutangulus was tube−like, running from mouth to telson, and was flanked with numerous 3D−preserved bulbous, paired features interpreted as digestive glands. The appendage design of I. acutangulus indicates that the animal was a swimmer and a visual predator living off−bottom. The general anatomy of Isoxys longissimus was similar to that of I. acutangulus although less information is available on the exact shape of its appendages and visual organs. I. longissimus is characterized by extremely long anterior and posterior spines. There are now seven Isoxys species known with soft−part preservation, I. acutangulus, I. longissimus from the Burgess Shale, I. auritus and I. curvirostratus from the Maotianshan Shale of China, I. communis and I. glaessneri from the Emu Bay Shale of Australia and I. volucrisfrom Sirius Passet in Greenland. The frontal appendages of Isoxys strongly resemble those of other Cambrian arthropods, characterized by a single pair of “great appendages” with a shared prehensile function yet some variability in length and shape.
Źródło:
Acta Palaeontologica Polonica; 2009, 54, 4
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On board LNG reliquefaction technology: a comparative study
Autorzy:
Gómez, J.
Gómez, M.
Garcia, R.
Catoira, A.
Powiązania:
https://bibliotekanauki.pl/articles/963412.pdf
Data publikacji:
2014
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
reliquefaction
boil-off gas
vessel
Brayton Cycle
efficiency
Opis:
Reliquefaction technologies are being currently applied on board liquefied natural gas (LNG) carriers on the basis of economic criteria and energy efficiency. A variety of reliquefaction techniques have been developed so far during the last decade. Nevertheless, technology enhancement continues being a research area of interest. In this article the different technologies applied to the reliquefaction of the boil-off gas (BOG) on LNG carriers have been described, analysed and discussed, contributing to highlight the process and operation characteristics as well as selection plant criteria. Finally, a comparison of the different reliquefaction plants, considering their capacities and efficiencies as well as other technical data of interest has been carried out.
Źródło:
Polish Maritime Research; 2014, 1; 77-88
1233-2585
Pojawia się w:
Polish Maritime Research
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

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