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Tytuł:
Improving maritime traffic safety by applying routes exchange and automatic relevant radar data exchange
Autorzy:
Salous, M.
Müller, H.
Bolles, A.
Hahn, A.
Powiązania:
https://bibliotekanauki.pl/articles/135291.pdf
Data publikacji:
2015
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
e-navigation strategy
maritime traffic
automated data exchange
Human Machine Interfaces
navigation systems
potential collisions
Opis:
The e-navigation strategy of the International Maritime Organization (IMO) aims to improve the safety of maritime traffic by increasing cooperation between several maritime stakeholders. The COSINUS (Bolles et al., 2014) project contributes to such a strategy by enabling an automated data exchange (observations, routes and maneuver plans) between ship-side and shore-side navigational systems, developing useful sensor fusion applications upon the new information available from data exchange and introducing new Human Machine Interfaces (HMIs) to support the users of navigation systems. The project shows potential for improvement in maritime traffic safety by ensuring continuous awareness to all participants involved through sensor fusion applications, i.e. by providing all participants (mobile and stationary navigation systems) with a complete view at all times. These applications include detection of critical situations like radar shadowing areas, early and accurate prediction of potential collisions or closest point of approach (CPA) based on the exchanged routes, and improving the accuracy of radars by ensuring high quality data for obstructed or far away routes. The new HMI concepts introduced within the COSINUS project aim at highlighting critical maritime traffic situations. Thus, the users of such navigation systems supported with COSINUS facilities can easily detect such critical situations and react efficiently to avoid collisions, possible crowded areas and inefficient routes.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2015, 44 (116); 90-98
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Computation and experimental comparison of the deformation behavior of pantographic structures with different micro-geometry under shear and torsion
Autorzy:
Yang, Hua
Müller, Wolfgang H.
Powiązania:
https://bibliotekanauki.pl/articles/281645.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
nonlinear elasticity
metamaterial
numerical simulation
Opis:
Additive manufacturing methods, commonly known as 3D printing, allow more sophisticated designs to be created. Willingly designed substructures incorporated into the solid open up new possibilities for uncommon macroscopic deformation behavior. Such a man-made structure is also referred to as a metamaterial. A detailed simulation of a polymer-based metamaterial is challenging but accurately possible by means of the theory of elasticity. In this study, we present experimental investigations of a metamaterial composed of pantographic substructures of different internal geometry. The pantographic structures show an unexpected type of deformation, which can be modeled via elasticity with the aid of direct numerical simulation by using the Finite Element (FE) method. In other words, a detailed mesh is generated involving the substructure. The metamaterial is additively manufactured out of a common polymer showing nonlinear elastic deformation and, therefore, hyperelastic material models are used. Specifically, analytical solutions of a circular cylinder are examined and compared in the case of extension and torsion in order to comprehend the effects of the coefficients inherent to the energy function of the hyperelastic model. Finally, FE computations of pantographic structures are performed and compared with the experimental measurements.
Źródło:
Journal of Theoretical and Applied Mechanics; 2019, 57, 2; 421-434
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Towards Attosecond Pulses with High Harmonics
Autorzy:
Agostini, P.
Paul, P. M.
Breger, P.
Toma, E. S.
Muller, H. G.
Mullot, G.
Augé, F.
Balcou, Ph.
Powiązania:
https://bibliotekanauki.pl/articles/2030463.pdf
Data publikacji:
2002-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.65.Re
42.65.Ky
32.80.Rm
33.60.Cv
Opis:
The high harmonics produced by focusing an intense femtosecond laser in a gas are theoretically shown to be locked in phase. The physics of this locking is discussed and a new method based on quantum interference in two-photon, two-color ionization allowing to retrieve the relative phase of harmonic pairs is described. The main result is that the 5 harmonics of orders 11-19 produced in argon generate a train of subfemtosecond pulses with a period of 1.35 fs and a duration of 250 attoseconds.
Źródło:
Acta Physica Polonica A; 2002, 101, 3; 313-324
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Composition and Temperature Dependence of Giant Magnetoresistance in Melt-Spun Co_{x}Cu_{100-x} Ribbons
Autorzy:
Idzikowski, B.
Nenkov, K.
Handstein, A.
Hütten, A.
Müller, K. H.
Powiązania:
https://bibliotekanauki.pl/articles/1964599.pdf
Data publikacji:
1997-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.70.Pa
72.15.Eb
81.40.Rs
Opis:
Structure, magnetic properties and magnetoresistance in as-quenched and annealed Co$\text{}_{x}$Cu$\text{}_{100-x}$ samples were investigated. Homogeneous metastable Co$\text{}_{x}$Cu$\text{}_{100-x}$ alloys were prepared by the single-roller technique. The maximum value of magnetoresistance is shifted to higher annealing temperatures with increasing measuring temperature. At higher measuring temperatures the magnetoresistance is not saturated in fields as high as 16 T. Susceptibility measurements showed the formation of hcp-structured Co clusters. For small cobalt concentrations there is a transition from giant magnetoresistance to the normal anisotropic magnetoresistance.
Źródło:
Acta Physica Polonica A; 1997, 92, 2; 307-310
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Giant Magnetoresistance in Melt-Spun Co-Cu Modified by Rare Earths
Autorzy:
Idzikowski, B.
Rössler, U. K.
Handstein, A.
Nenkov, K.
Müller, K.-H.
Powiązania:
https://bibliotekanauki.pl/articles/2013425.pdf
Data publikacji:
2000-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.70.Pa
75.50.Tt
Opis:
Samples of the composition RE$\text{}_{x}$Co$\text{}_{20}$Cu$\text{}_{80-x}$, RE = Sm, Gd or Dy (x = 0, 1, and 3) were produced by melt-spinning and subsequent annealing. The magnetoresistance is negative as in granular Co-Cu, but its values depend on the kind of rare earth element added and on changes in the microstructure induced by thermal annealing. An addition of 1 at.% rare earth metal to Co$\text{}_{20}$Cu$\text{}_{80}$ yields a considerable increase in the magnetoresistance ratio, whereas an addition of 3 at.% causes a decrease. E.g., by addition of 1 at.% Dy to Co$\text{}_{20}$Cu$\text{}_{80}$ and optimal thermal treatment, the value of magnetoresistance ratio measured at 10 K in a field of 5 T increases from -14% to -28%. The effect can be attributed to the presence of clusters of hexagonal Dy(Co,Cu)$\text{}_{5}$, which was ascertained from X-ray diffraction data, or other, metastable rare-earth compounds and paramagnetic rare-earth atoms in the Cu matrix.
Źródło:
Acta Physica Polonica A; 2000, 97, 5; 791-794
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of an artificial neural network and morphing techniques in the redesign of dysplastic trochlea
Autorzy:
Cho, K. J.
Müller, J. H.
Erasmus, P. J.
Dejour, D.
Scheffer, C.
Powiązania:
https://bibliotekanauki.pl/articles/307312.pdf
Data publikacji:
2014
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
artificial neural network
trochlea redesign
trochlear dysplasia
trochleoplasty
trochlea morphing
sztuczna sieć neuronowa
bloczek
biomechanika
Opis:
Segmentation and computer assisted design tools have the potential to test the validity of simulated surgical procedures, e.g., trochleoplasty. A repeatable measurement method for three dimensional femur models that enables quantification of knee parameters of the distal femur is presented. Fifteen healthy knees are analysed using the method to provide a training set for an artificial neural network. The aim is to use this artificial neural network for the prediction of parameter values that describe the shape of a normal trochlear groove geometry. This is achieved by feeding the artificial neural network with the unaffected parameters of a dysplastic knee. Four dysplastic knees (Type A through D) are virtually redesigned by way of morphing the groove geometries based on the suggested shape from the artificial neural network. Each of the four resulting shapes is analysed and compared to its initial dysplastic shape in terms of three anteroposterior dimensions: lateral, central and medial. For the four knees the trochlear depth is increased, the ventral trochlear prominence reduced and the sulcus angle corrected to within published normal ranges. The results show a lateral facet elevation inadequate, with a sulcus deepening or a depression trochleoplasty more beneficial to correct trochlear dysplasia.
Źródło:
Acta of Bioengineering and Biomechanics; 2014, 16, 2; 75-84
1509-409X
2450-6303
Pojawia się w:
Acta of Bioengineering and Biomechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Collaboration and communication in a networked economy
Współpraca i komunikacja w usieciowionej gospodarce
Autorzy:
Pfohl, H. Ch.
Müller, K.
Powiązania:
https://bibliotekanauki.pl/articles/361649.pdf
Data publikacji:
2015
Wydawca:
Wyższa Szkoła Logistyki
Tematy:
collaboration
communication
network
logistics strategies
innovation
współpraca
komunikacja
strategie logistyczne
innowacje
Opis:
Background: The networked economy is a result of the increasing specialization and productivity. The blurring of company boundaries enables potential for new competitive advantages. However, along with the growing networked economy, the complexity also increases. Methods: With their current study the German logistics association sheds a light on the most important trends of the networked and complex economy and the strategies of logistics and supply chain management (SCM) coping with them. Results and conclusions: This paper focuses on the collaboration of actors in logistics and supply chain management and the communication required for being successful. Furthermore, going beyond the study, the role of collaboration for innovation in logistics and SCM is considered, that has been neglected in literature so far. Finally, the paper concludes with a discussion reflecting the current state of collaboration in the context of its potential.
Wstęp: Usieciowiona gospodarka jest wynikiem wzrastającej specjalizacji oraz produktywności. Zacieranie się granic przedsiębiorstw umożliwia uzyskiwanie nowych form przewagi konkurencyjnej. Jednak, wraz ze wzrostem usieciowanej gospodarki, wzrasta również jej złożoność. Metody: Prezentowana praca przybliża najważniejsze trendy usieciowionej i kompleksowej gospodarki, jak również odpowiadające na nie strategie logistyki i zarządzania łańcuchami dostaw. Wyniki i wnioski: Praca skupia się na współpracy aktorów w obrębie zarządzania logistyką i łańcuchem dostaw oraz komunikacją niezbędną do osiągnięcia sukcesu. Wychodząc dalej, została omówiona rola współpracy zakresie innowacji w logistyce oraz zarządzaniu łańcuchem dostaw, która - jak dotąd - jest stosunkowo słabo opisana w literaturze fachowej. Zaprezentowano również wnioski wraz z dyskusją na temat obecnego stanu współpracy w kontekście jej potencjalnych możliwości.
Źródło:
LogForum; 2015, 11, 2; 139-149
1734-459X
Pojawia się w:
LogForum
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of cold night temperature on flowering of Kalanchoe species
Autorzy:
Coelho, L.L.
Mackenzie, K.K.
Lütken, H.
Müller, R.
Powiązania:
https://bibliotekanauki.pl/articles/11867521.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
Tematy:
ornamental plant
flowering plant
Kalanchoe
Kalanchoe longiflora
Kalanchoe marmorata
Kalanchoe prittwitzii
photoperiod
flowering induction
cold temperature
night temperature
Opis:
Control of flower induction is one of the most important aims in the floriculture industry as it determines the usefulness of plants for cross-pollination and production of flowering plants. The Kalanchoë genus contains around 140 species and numerous interspecific hybrids with a broad range of morphological traits, which makes this genus one of the most cultivated potted plants in the world. Commercial cultivars are easily induced to flowering by short days photoperiod, however, the number of species used for breeding is limited due to the lack of knowledge of flower inducing factors. Many studies suggested that cold night temperature can positively affect flowering in some Kalanchoë species. This study aimed to evaluate flowering in K. prittwitzii, K. marmorata and K. longiflora exposed to different night temperatures (6°C, 12°C and 18°C) combined with short day photoperiod (8 h). K. prittwitzii exhibited 100% flowering in all treatments, and flowering was enhanced by low night temperatures. K. marmorata had minimal flowering response to the treatments and K. longiflora did not flower in any of the treatments. The results support a postulate that interaction between different stimuli is required for flower induction in Kalanchoë species and demonstrate that night temperature can modify the flowering response. Therefore, the interaction between different factors during the plant life cycle requires further investigation.
Źródło:
Acta Scientiarum Polonorum. Hortorum Cultus; 2018, 17, 3; 121-125
1644-0692
Pojawia się w:
Acta Scientiarum Polonorum. Hortorum Cultus
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical simulation of the influence of a fillet and a bulb on the secondary flow in a compressor cascade
Autorzy:
Hoeger, M.
Schmidt-Eisenlohr, U.
Gomez, S.
Sauer, H.
Müller, R.
Powiązania:
https://bibliotekanauki.pl/articles/1986762.pdf
Data publikacji:
2002
Wydawca:
Politechnika Gdańska
Tematy:
secondary flow
compressor cascade
fillet
bulb
Opis:
Large fillet radii are typically found on highly loaded compressor rotors to ensure structural integrity. The objective of this paper is to investigate the impact of such real geometry effects on the flow at the hub section. Investigations were performed numerically for the idealised case of a plane compressor cascade with the 3D Navier-Stokes code TRACE_S. Realistic inlet boundary layer displacement thickness and typical loading levels close to stall are considered at low inlet Mach numbers Ma1 = 0.23. A large fillet with a relative radius of 16% chord length is considered as well as a 3D leading edge bulb-configuration designed at TU Dresden. The results are discussed in terms of iso-Mach surfaces, secondary flow patterns and spanwise incidence and turning. A complex 3D vortex system rises from the fillet radius, which improves the aerodynamic behaviour of the cascade at the end-wall section. With the bulb configuration the suction surface horse-shoe vortex leg was demonstrated to weaken the undesirable cross flow and by that to reduce the hazard of corner stall.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2002, 6, 1; 25-37
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-10 z 16

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