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Tytuł:
A Simple Localized-Itinerant Model for PrAl$\text{}_{3}$: Crystal Field and Exchange Effects
Autorzy:
Von Ranke, P. J.
Palermo, L.
Da Silva, X. A.
Powiązania:
https://bibliotekanauki.pl/articles/1891680.pdf
Data publikacji:
1991-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.10.Dg
75.30.Cr
Opis:
We present a simple magnetic model for PrAl$\text{}_{3}$. The effects of crystal field are treated using a reduced set of levels and the corresponding wave functions are extracted from the actual crystal field levels of Pr$\text{}^{+3}$ in a hexagonal symmetry. The exchange between 4f- and conduction-electrons are dealt within a molecular field approximation. An analytical magnetic state equation is derived and the magnetic behaviour discussed. The parameters of the model are estimated from a fitting of the inverse susceptibility of PrAl$\text{}_{3}$ given in the literature.
Źródło:
Acta Physica Polonica A; 1991, 80, 4; 583-590
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Combined Analyses of Ion Beam Synthesized Layers in Porous Silicon
Autorzy:
Ramos, A. R.
Pászti, F.
Horváth, Z. E.
Vázsonyi, É.
Conde, O.
da Silva, M. F.
da Silva, M. R.
Soares, J. C.
Powiązania:
https://bibliotekanauki.pl/articles/2028988.pdf
Data publikacji:
2001-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.10.-i
61.18.Bn
61.43.Gt
68.55.Ln
Opis:
High dose ion implantation was used to form polycrystalline silicide films on porous silicon with different native concentrations of light impurities (C and O). Porous silicon layers severalμm thick were implanted with 170 keV Cr$\text{}^{+}$ ions to fluences of 3×10$\text{}^{17}$ ions/cm$\text{}^{2}$ both at room temperature and 450ºC. Similar samples were implanted with 100 keV Co$\text{}^{+}$ ions to fluences of 2×10$\text{}^{17}$ ions/cm$\text{}^{2}$ at room temperature, 350ºC, and 450ºC. The formed silicide compounds were studied by Rutherford backscattering spectrometry, elastic recoil detection, glancing incidence X-ray diffraction, and four point-probe sheet resistance measurements. Selected Co implanted samples were analysed by cross-section transmission electron microscopy. Results show that the light impurities were partially expelled from the forming silicide layer. Combining cross-section transmission electron microscopy with ion beam methods it was possible to show that, in the implanted region, the porous structure collapses and densifies during implantation, but the underlying porous silicon remains intact. The layer structure, as well as the quality and type of the formed silicide, were found to depend on the original impurity level, implantation temperature, and annealing.
Źródło:
Acta Physica Polonica A; 2001, 100, 5; 773-780
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Biomechanical modelling for whole body motion using natural coordinates
Biomechaniczne modelowanie trójwymiarowych ruchów człowieka w środowisku współrzędnych naturalnych
Autorzy:
Czaplicki, A.
Silva, M. T.
Ambrosio, J. C.
Powiązania:
https://bibliotekanauki.pl/articles/281844.pdf
Data publikacji:
2004
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
biomechanical model
multibody dynamics
inverse dynamics
internal forces
Opis:
The study of spatial human movements requires the development and use of a three-dimensional model. The model proposed here has 44 degrees-of-freedom and it is described using natural coordinates, which do not require an explicit definition of rotation coordinates. The biomechanical model consists of 16 anatomical segments composed of 33 rigid bodies. Joint actuators are introduced into equations of motion of the multibody model by means of kinematic driver constrains in order to reflect the effect of the muscle forces about each anatomical joint. After associating a Lagrange multiplier to each joint actuator, the torques that represent muscle forces become coupled with the biomechanical model through the Jacobian matrix of the underlying multibody system. The developed model is applied to identify net torques and reaction forces at the anatomical joints in application cases that include the take-off to aerial trajectories and standing backwards somersault.
W pracy zaprezentowano pełną metodologię do badania ruchów człowieka. Podstawowym elementem tej metodologii jest trójwymiarowy biomechaniczny model ciała ludzkiego. Położenia członów modelu opisano za pomocą współrzędnych naturalnych, co wyeliminowało konieczność użycia współrzędnych kątowych. Model składa się z 33 ciał sztywnych połączonych przegubami (stawami) i posiada 44 stopnie swobody. Wypadkowe momenty sterujące w poszczególnych stawach pochodzące od sił mięśniowych wprowadzono do dynamicznych równań ruchu modelu za pomocą stosownych więzów kinematycznych pomiędzy sąsiadującymi członami w danym stawie. Wartości tych momentów wyznaczono wykorzystując formalizm mnożników Lagrange'a. Model wykorzystano do identyfikacji wypadkowych momentów mięśniowych i reakcji wewnętrznych w głównych stawach kończyny dolnej człowieka podczas odbicia do skoku w dal oraz w trakcie wykonywania salta w tył z miejsca.
Źródło:
Journal of Theoretical and Applied Mechanics; 2004, 42, 4; 927-944
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Development and production of radioactive sources used for cancer treatment in Brazil
Autorzy:
Rostelato, M. E. C. M.
Rela, P. R.
Zeituni, C. A.
Feher, A.
Manzoli, J. E.
Moura, J. A.
Moura, E. S.
Silva, C. P. G.
Powiązania:
https://bibliotekanauki.pl/articles/148305.pdf
Data publikacji:
2008
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
radioactive sources production
iodine-125 seeds
iridium-192 wires
brachytherapy
cancer treatment
Opis:
The number of cancer patients in Brazil is increasing and part of the patients are submitted to brachytherapy treatment using iridium-192 wire and iodine-125 radioactive seeds. The Nuclear Energy Research Institute established a programme to produce iridium-192 wire and iodine-125 radioactive seeds. With the purpose of settling a laboratory for iridium-192 sources production, a wire activation method was developed and a hot cell for the wire manipulation, quality assurance and packaging was built. The iodine-125 seeds consist of a welded titanium capsule containing iodine-125 adsorbed onto a silver rod. Concerning the setup of the local production, the following activities were carried out: superficial treatment of the silver rod, development of a process to absorb the iodine in the silver rod, welding methodology to seal the seeds, leakage and contamination test and source activity measurement.
Źródło:
Nukleonika; 2008, 53, suppl. 2; 99-103
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Attachment of 2,2-bipyridine onto a silica gel for application as a sequestering agent for copper, cadmium and lead ions from an aqueous medium
Autorzy:
Souza, E. J.
Cristante, V. M.
Padilha, P. M.
Jorge, S. M. A.
Martines, M. A. U.
Silva, R. I. V.
Carmo, D. R.
Castro, G. R.
Powiązania:
https://bibliotekanauki.pl/articles/779827.pdf
Data publikacji:
2011
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
2,2-bipirydyna
żel krzemionkowy
adsorpcja
jony metali
2,2'-bipyridine
silica gel
adsorption
metal ions
Opis:
A method was developed to attach 2,2-bipyridine (BP) onto a silica gel surface by a two-step reaction. The fi rst step consisted of a reaction between the matrix and a silylating agent, 3-chloropropyltrimethoxysilane. In the second step of the reaction, a ligand molecule was attached onto Si-CPTS, yielding the product Si-BP. The modified material contained 0.431±0.01 mmol of 2,2-bipyridine per gram of modified silica, as confirmed by FT-IR spectra of the proposed structure. The surface modification was characterized by the BET technique, which revealed a decrease in the surface area from 614 to 450 m2 g-1. The series of adsorption isotherms for the metal ions were adjusted to fit a modified Langmuir equation. The maximum number of moles of copper, cadmium and lead ions adsorbed was 0.64, 0.53, and 0.54 mmol g-1, respectively. The surface saturation was calculated as ¢ fraction and the values obtained, Cu(II) =1.160, Cd(II) = 1.044 and Pb(II) = 0.997, suggest a type 1:1 metal-ligand complex.
Źródło:
Polish Journal of Chemical Technology; 2011, 13, 4; 28-33
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
First Record of Testate Amoebae on Glaciers and Description of a New Species Puytoracia jenswendti nov. sp. (Rhizaria, Euglyphida)
Autorzy:
Santibáñez, Pamela A.
Kohshima, Shiro
Scheihing, Rodrigo A.
Silva, Ricardo
Jaramillo M, Jorge I.
Labarca P, Pedro J.
Casassa R., Gino
Powiązania:
https://bibliotekanauki.pl/articles/763674.pdf
Data publikacji:
2011
Wydawca:
Uniwersytet Jagielloński. Wydawnictwo Uniwersytetu Jagiellońskiego
Tematy:
Glacier, Firn core, Testate amoebae, Trinematidae, Trinema, Puytoracia
Opis:
This study documents for the first time the presence of testate amoebae on glaciers. Three shallow firn cores of 10 m depth were obtained from the Mocho-Choshuenco and Osorno volcanoes, Southern Andes, Chile, in October and November, 2005. Euglyphid testate amoebae were detected in 28 samples that correspond to the spring-summer layers of the firn cores. Inspection of 454 collected individuals reveals the presence of four different taxa. Three of these taxa, Trinema lineare, Trinema enchelys and Puytoracia bergeri have previously been reported in ice-free environments. The fourth taxon corresponds to a new species Puytoracia jenswendti nov. sp. The observation of food content and reproductive activities in a significant fraction of specimens evidence that testate amoebae are competent to inhabit glaciers. The testate amoebae found in the firn cores display clear seasonal variations in abundance indicating that these records can provide a new and novel proxy as paleoindicator for firn/ice core dating and for estimation of past glacier mass balance.
Źródło:
Acta Protozoologica; 2011, 50, 1
1689-0027
Pojawia się w:
Acta Protozoologica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Solution of singular optimal control problems using the improved differential evolution algorithm
Autorzy:
Lobato, F. S.
Steffen, Jr, V.
Silva Neto, A. J.
Powiązania:
https://bibliotekanauki.pl/articles/91654.pdf
Data publikacji:
2011
Wydawca:
Społeczna Akademia Nauk w Łodzi. Polskie Towarzystwo Sieci Neuronowych
Tematy:
differential evolution algorithm
optimal control
dynamic updating
population
convergence rate
mechanical engineering
chemical engineering
Opis:
The Differential Evolution algorithm, like other evolutionary techniques, presents as main disadvantage the high number of objective function evaluations as compared with classical methods. To overcome this disadvantage, this work proposes a new strategy for the dynamic updating of the population size to reduce the number of objective function evaluations. This strategy is based on the definition of convergence rate to evaluate the homogeneity of the population in the evolutionary process. The methodology is applied to the solution of singular optimal control problems in chemical and mechanical engineering. The results demonstrated that the methodology proposed represents a promising alternative as compared with other competing strategies.
Źródło:
Journal of Artificial Intelligence and Soft Computing Research; 2011, 1, 3; 195-206
2083-2567
2449-6499
Pojawia się w:
Journal of Artificial Intelligence and Soft Computing Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Relationship Between the Levels of Stress and the Age and Years of Service of Military Firefighters From the Fire Rescue Corps of the Metropolitan Area of the State of Sao Paulo
Autorzy:
de Oliveira, R. S.
de Barros Neto, T. L.
da Silva, A. A.
Grandi, J. L.
Menezes, I. B. S.
Powiązania:
https://bibliotekanauki.pl/articles/89950.pdf
Data publikacji:
2012
Wydawca:
Centralny Instytut Ochrony Pracy
Tematy:
burnout
professional
age effect
work hours
firefighters
Opis:
Purpose. To verify the relationship between stress indicators and the age and years of service of military firefighters from the fire rescue corps of the metropolitan area of the state of Sao Paulo. Methods. Forty military firefighters with the mean age of 37.9 ± 5.4 years, from the 1st, 2nd and 8th fire brigades of the metropolitan area of Sao Paulo participated in this study. All underwent clinical, physical and psychological evaluations to verify the relationship between the age and years of service with the variables of levels of stress (tension, depression, anger, vigor, fatigue, confusion and total stress) on workdays and on days off. Results. On workdays, the mean scores for tension, depression, fatigue and stress were overall higher compared to those on days off. The older the firefighter, the higher the levels of stress, depression, anger and total stress. The more years of service, the greater the depression and anger. Conclusions. The levels of stress were high on workdays. Chronological age and years of service influenced the increase in the scores of stress.
Źródło:
International Journal of Occupational Safety and Ergonomics; 2012, 18, 4; 579-586
1080-3548
Pojawia się w:
International Journal of Occupational Safety and Ergonomics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A review of the in vitro propagation of Bauhinia spp.
Autorzy:
Teixeira da Silva, J.A.
Powiązania:
https://bibliotekanauki.pl/articles/2075.pdf
Data publikacji:
2013
Wydawca:
Instytut Ogrodnictwa
Tematy:
Bauhinia acuminata
Bauhinia variegata
Bauhinia purpurea
Bauhinia monandra
Bauhinia galpinii
Bauhinia blakeana
ornamental plant
liana
in vitro propagation
medicinal property
biological property
future perspective
Źródło:
Journal of Horticultural Research; 2013, 21, 1
2300-5009
Pojawia się w:
Journal of Horticultural Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Foliar treatment with proline and tyrosine affect the growth and yield of beetroot and some pigments in beetroot leaves
Autorzy:
El-Sherbeny, M.R.
Teixeira da Silva, J.A.
Powiązania:
https://bibliotekanauki.pl/articles/2059.pdf
Data publikacji:
2013
Wydawca:
Instytut Ogrodnictwa
Tematy:
Beta vulgaris
red beet
pigment content
chlorophyll
carotenoid
proline
tyrosine
carbohydrate content
foliar treatment
vegetative growth
yield
Źródło:
Journal of Horticultural Research; 2013, 21, 2
2300-5009
Pojawia się w:
Journal of Horticultural Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Tracking young talented swimmers : follow-up of performance and its biomechanical determinant factors
Autorzy:
Morais, J. E.
Saavedra, J. M.
Costa, M. J.
Silva, A. J.
Marinho, D. A.
Barbosa, T. M.
Powiązania:
https://bibliotekanauki.pl/articles/951824.pdf
Data publikacji:
2013
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
prepubescent swimmers
longitudinal assessment
kinematics
drag force
anthropometrics
efficiency
kinematyka
efektywność
pływak
biomechanika
Opis:
The aim of the study was to follow-up the stability of young talented swimmers’ performance and its biomechanical determinant factors (i.e., anthropometrics, kinematics, hydrodynamics and efficiency) during a competitive season. Thirty three (15 boys and 18 girls) young swimmers (overall: 11.81 ± 0.75 years old and Tanner stages 1–2 by self-evaluation) were evaluated. Performance, anthropometrics, hydrodynamics, kinematics and efficiency variables were assessed at three moments during a competitive season. Performance had a significant improvement (with minimum effect size) and a moderate-very high stability throughout the season. In the anthropometrics domain all variables increased significantly (ranging from without to minimum effect size) between moments and had a moderate-very high stability. Hydrodynamics presented no variations between all moments and had a low-very high stability throughout the season. In the kinematics domain, there were no variations between moment one and three, except for an increase in stroke frequency (without size effect). Speed fluctuation remained constant, with no significant variations. All kinematic variables had a low-very high stability. Efficiency variables did not present variations between moment one and three and had a low-moderate stability. Overall, young swimmers showed a minimum improvement in performance and in anthropometric factors; and a moderate stability of performance and its determinant factors (i.e., anthropometrics, hydrodynamics, kinematics and efficiency) during the competitive season.
Źródło:
Acta of Bioengineering and Biomechanics; 2013, 15, 3; 129-138
1509-409X
2450-6303
Pojawia się w:
Acta of Bioengineering and Biomechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
How do rare earth elements (lanthanoids) affect root development and protocorm-like body formation in hybrid Cymbidium?
Autorzy:
Teixeira da Silva, J.A.
Powiązania:
https://bibliotekanauki.pl/articles/2174.pdf
Data publikacji:
2014
Wydawca:
Instytut Ogrodnictwa
Tematy:
lanthanide
root development
orchid
protocorm-like body
rare earth element
root formation
plant growth regulator
Cymbidium
Źródło:
Journal of Horticultural Research; 2014, 22, 1
2300-5009
Pojawia się w:
Journal of Horticultural Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
In vitro propagation of Nepalese orchids: a review
Autorzy:
da Silva, J.A.T.
Acharya, K.P.
Powiązania:
https://bibliotekanauki.pl/articles/1932.pdf
Data publikacji:
2014
Wydawca:
Instytut Ogrodnictwa
Tematy:
in vitro propagation
Nepal
Orchidaceae
orchid
seed germination
tissue culture
germplasm
Źródło:
Journal of Horticultural Research; 2014, 22, 2
2300-5009
Pojawia się w:
Journal of Horticultural Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Metro as an example of an urban rail system. Four case studies from Europe
Metro jako przykład zurbanizowanego systemu kolejowego.Cztery przykłady z Europy
Autorzy:
Fraszczyk, A.
Magalhaes Da Silva, J.
Gwóźdź, A.
Vasileva, G.
Powiązania:
https://bibliotekanauki.pl/articles/374208.pdf
Data publikacji:
2014
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
metro system
urban rail system
comparisons
ticketing
system metro
system kolei miejskich
porównania
specyfikacja techniczna
bilet
Opis:
Underground, tube, subway or metro are common expressions used to describe a rapid transit system serving urban areas. Such a system uses dedicated rail corridors, can run underground or overground, and often includes tunnels and viaducts. Although there are 148 cities in the world with metro systems, each system is different, interms of layout, length, capacity, etc., as it serves different geographical and socioeconomical areas. In this context, the paper presents four European metro systems (Sofia, Warsaw, Lisbon, and Tyne and Wear), introduces the systems dimensions, rolling stock and ticketing strategies and compares similarities and differences between the systems. The analyses suggest a number of recommendations and improvements, which if implemented, could benefit other metro systems in Europe and beyond.
W języku angielskim występuje wiele określeń opisujących metro. System ten wykorzystuje dedykowane korytarze kolejowe, mogące pracować pod ziemią lub nad ziemią i często obejmuje tunele oraz wiadukty. Mimo że istnieje na świecie 148 miast mających systemy metra, każdy system jest inny pod względem układu, długości, pojemności itp., ponieważ występują w różnych układach geograficznych i systemach społeczno-ekonomicznych. W tym kontekście, artykuł prezentuje cztery europejskie systemy metra (Sofii, Warszawy, Lizbony i Tyne and Wear), przedstawia wymiary systemów metra, taboru, strategię biletową i porównuje podobieństwa i różnice pomiędzy nimi. Analizy wskazują wiele zaleceń i usprawnień, które jeżeli zostaną wdrożone, mogą przynieść zysk dla systemów metra w Europie i poza nią.
Źródło:
Transport Problems; 2014, T. 9, z. spec.; 101-108
1896-0596
2300-861X
Pojawia się w:
Transport Problems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Railway industry roadmap in the state of Santa Catarina, Brazil
Roadmap para a indústria ferroviário do estado de Santa Catarina, Brasil
Autorzy:
Dias, A.
Da Silva, J. C.
Kagueiama, H. H.
Haddad, C. R.
Uriona, M. M.
Lezana, Á. G. R.
Juliatto, D. L.
Powiązania:
https://bibliotekanauki.pl/articles/374823.pdf
Data publikacji:
2015
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
technology
roadmapping
rail industry
technologia
mapa drogowa
przemysł kolejowy
branża kolejowa
Opis:
This article aims to identify the main requirements to strengthen the railroad industry in Santa Catarina by using technology roadmapping. The railway industry is composed of carriers, manufacturers, suppliers, operators, logistics, services and education. The survey aimed to provide guidelines for the Federation of the State of Santa Catarina Industry (FIESC) to develop its strategic plan for the next eight years. Based on the survey, the roadmap defined vision, mission, a list of key concepts, drivers and actions for the Federation to support the railway industry development, since this industrial sector is still economically unrepresented when compared to other sectors in Santa Catarina. The survey also pointed out there is a strong expansion program of the railway freight and railway transport for people in Brazil, both in government and private sectors.
Este artigo objetiva identificar os principais requisitos para fortalecer a indústria ferroviária em Santa Catarina (SC), por meio da aplicação do processo de technology roadmapping. A indústria ferroviária é composta por transportadores, fabricantes, fornecedores, operadores de logística, serviços e educação. A pesquisa objetivou fornecer orientações para a Federação das Indústrias de Santa Catarina (FIESC) com a finalidade de desenvolver um plano estratégico para os próximos oito anos. Baseando-se na pesquisa, definiram-se a visão, missão e uma lista de conceitos chaves, drivers e ações para que a FIESC apoiasse o desenvolvimento da indústria ferroviária, uma vez que esta é economicamente pouco representativa em comparação com outras indústrias no estado de SC. A pesquisa apontou que há forte expansão do transporte de cargas e pessoas no Brasil, tanto nos setores governamentais quanto nos setores privados.
Źródło:
Transport Problems; 2015, T. 10, z. spec.; 29-36
1896-0596
2300-861X
Pojawia się w:
Transport Problems
Dostawca treści:
Biblioteka Nauki
Artykuł
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