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Wyświetlanie 1-10 z 72
Tytuł:
AC Microcalorimetry of Superconducting $MgCNi_3$ Single Crystals
Autorzy:
Kačmarčík, J.
Pribulová, Z.
Samuely, P.
Marcenat, C.
Klein, T.
Jang, D.
Lee, H.
Lee, S.
Tematy:
74.70.Ad
74.25.Bt
Pokaż więcej
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:
https://bibliotekanauki.pl/articles/1813689.pdf  Link otwiera się w nowym oknie
Opis:
The low-temperature specific heat of single-crystal samples of superconducting $MgCNi_3$ with typical dimensions 200 μm were measured for the first time. A computer controlled ac microcalorimeter using an optical fiber and an infrared light-emitting diode as the heat source was used down to 2 K at magnetic fields up to 8 T. The specific heat data suggest a moderate coupling in $MgCNi_3$.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Two-Gap Superconductivity in $2H-NbS_2$
Autorzy:
Pribulová, Z.
Leroux, M.
Kačmarčík, J.
Marcenat, C.
Klein, T.
Rodière, P.
Cario, L.
Samuely, P.
Tematy:
74.25.Bt
74.70.Ad
Pokaż więcej
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:
https://bibliotekanauki.pl/articles/1535279.pdf  Link otwiera się w nowym oknie
Opis:
We performed specific heat measurements of the superconducting single crystal of $2H-NbS_2$ in the temperature range down to 0.6 K and magnetic fields up to 14 T. The temperature and magnetic field dependence of the electronic specific heat consistently indicate existence of two superconducting energy gaps in the system. The superconducting anisotropy depends on both temperature and magnetic field. Moreover, the angular dependence of the upper critical field deviates from the Ginzburg-Landau behavior and rather reminds that of $MgB_2$. All these features point to a multigap superconductivity in $2H-NbS_2$. Our measurements are in a perfect agreement with the previous scanning tunneling spectroscopy of Guillamón et al.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Local Magnetometry of $Cu_{0.064}TiSe_{2}$
Autorzy:
Pribulová, Z.
Medvecká, Z.
Kačmarčík, J.
Komanický, V.
Klein, T.
Husaníková, P.
Cambel, V.
Šoltýs, J.
Karapetrov, G.
Samuely, P.
Tematy:
74.25.Ha
74.25.Wx
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Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:
https://bibliotekanauki.pl/articles/1372336.pdf  Link otwiera się w nowym oknie
Opis:
Local magnetometry using miniature Hall-probe array was used to study vortex distribution in superconducting single crystal of $Cu_{x}TiSe_{2}$, with x=0.064 and $T_{c}$=3.2 K. We show that vortices after penetration into the sample move towards the center, resulting into a dome-shape field profile. Such a profile is a signature of relatively low pinning. We show that these measured profiles are consistent with a model proposed for the samples in the absence of bulk pinning. Modifications necessary to obtain quantitative agreement between the model and the data are presented.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Superconducting Transition in Boron Doped Silicon Films
Autorzy:
Kociniewski, T.
Débarre, D.
Grockowiak, A.
Kačmarčík, J.
Marcenat, C.
Bustarret, E.
Ortega, L.
Klein, T.
Prudon, G.
Dubois, C.
Gautier, B.
Dupuy, J.
Tematy:
74.62.Dh
73.61.Cw
74.70.Ad
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Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:
https://bibliotekanauki.pl/articles/1535297.pdf  Link otwiera się w nowym oknie
Opis:
We report on a detailed analysis of the superconducting properties of boron-doped silicon films grown along the 001 direction by gas immersion laser doping. This technique is proved to be a powerful technique to dope silicon in the alloying range 2-10 at.% where superconductivity occurs. The superconducting transitions are sharp and well defined both in resistivity and magnetic susceptibility. The variation of $T_{c}$ on the boron concentration is in contradiction with a classical exponential dependence on superconducting parameters. Electrical measurements were performed in magnetic field on the sample with $c_{B}$ = 8 at.% (400 laser shots) which has the highest $T_{c}$ (0.6 K). No hysteresis was found for the transitions in magnetic field, which is characteristic of a type-II superconductor. The corresponding upper critical field was on the order of 1000 G at low temperatures, much smaller than the value previously reported. The temperature dependence of $H_{c2}$ is very well reproduced by the linearized Gorkov equations neglecting spin effects in the very dirty limit. These measurements in magnetic field allow an estimation of the electronic mean-free path, the coherence length, and the London penetration depth within a simple two-band free electron model.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A new placodont sauropterygian from the Middle Triassic of the Netherlands
Autorzy:
Klein, N.
Scheyer, T.M.
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Powiązania:
https://bibliotekanauki.pl/articles/22414.pdf  Link otwiera się w nowym oknie
Opis:
A new genus and species of a non-cyamodontoid placodont is described on the basis of an incomplete and disarticulated skeleton from Winterswijk, the Netherlands, dated as early Anisian (Lower Muschelkalk). The new taxon is unique in a ventrolateral expansion of the neural arches of the posterior presacral and sacral vertebrae, in which the transverse process is incorporated. It has a round, plate-like pubis and ischium, and the only preserved long bone indicates elongated limbs. The holotype, which is relatively large (>1.35 m) for a basal sauropterygian, has still un-fused halves of neural arches and no distinct neural spine developed yet. The new taxon is assigned to non-cyamodontoid placodonts based on its round girdle elements, the morphology of dorsal-, sacral-, and caudal ribs, the straight medial and mediolateral elements of gastral ribs, and the presence of un-sutured armour plates. In spite of the large size of the holotype, there is evidence that the animal was not yet fully grown, based on the paired neural arches, and general poor ossification of the bones. The un-fused halves of neural arches are interpreted as skeletal paedomorphosis, which is typical for vertebrates with a secondary marine life style. The sacral region seems to be highly flexible.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hybrid drive application for high-speed tracked vehicle
Autorzy:
Mężyk, A.
Czapla, T.
Klein, W.
Tematy:
transport
tracked vehicle
hybrid drive
electric drive
Pokaż więcej
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Powiązania:
https://bibliotekanauki.pl/articles/244179.pdf  Link otwiera się w nowym oknie
Opis:
Analysis of possible hybrid drive for tracked vehicle solutions and also concept vehicle project is presented in the paper. Study ofpresent tracked vehicle state-of-art shows that in case majority of currently designed and developed military tracked vehicles projects modifications hybrid propulsion is taken into account. Based on that, authors have decided to develop concept hybrid tracked vehicle study. Basic parameters of concept vehicle are described at the beginning: total vehicle mass up to 14 Mg, maximum speed over 60 km/h and also possibility of stealth operation at the low speed using electric energy stored in batteries. Then, analysis of hybrid electric drives configurations is presented. Three versions of hybrid electric propulsions are considered: two series hybrid drives and one parallel. Then final version is chosen for further development with discussion on justification of the choice description. dynamic model assumptions and modelling methods are described in next section. As a result of simulation, acceleration diagrams for chosen operation modes are shown. As the final stage of concept study, virtual 3D model was built. Virtual modelling methods are used to optimize transmission components layout in a concept tracked vehicle hull.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Upgrading valuable mineralization and rejecting magnesium silicates by pre-concentration of mafic ores
Autorzy:
Altun, N. E.
Weatherwax, T.
Klein, B.
Tematy:
mafic ores
preconcentration
dense media separation
metallic sulphides
ore mineralogy
Pokaż więcej
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:
https://bibliotekanauki.pl/articles/109691.pdf  Link otwiera się w nowym oknie
Opis:
Amenability of mafic ores to pre-concentration was investigated with respect to ore mineraliza-tion characteristics. For the pre-concentration tests seven ores from various nickel-copper operations at Sudbury, Ontario were subjected to dense medium separation. Size assays of metal values, i.e. distribution of nickel and copper with respect to size fractions, were also determined. The ores were assessed in three categories of valuable mineralization as massive pure sulphides, coarse massive sulphide grains and disseminated sulphides. For ores with massive pure sulphides and coarse massive sulphide grains even a size classification based pre-concentration route could be sought since a clear trend of metal enrichment was identified towards finer fractions. Orebodies of similar mineralogy had similar responses to pre-concentration tests. The best results were for those ore bodies with a distinct differentiation between mineralization and gangue, i.e. the ores with massive pure sulphides, where nickel recoveries of 97% and mass rejections of 38-53% were achieved. Similar results were obtained for ores with coarse massive sulphides. For disseminated sulphide mineralogy relatively lower mass rejection was attained with acceptable recoveries of metals. Rejection of magnesium bearing gangue, such as talc, was identified as another benefit of pre-concentration. The extent of magnesium rejection occurred as a function of ore mineralogy. Clear distinction between valuable mineralization and gangue provided preferential magnesium rejection at high levels with no or minor metal losses.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modern tendencies in the design of autonomous utility vehicles
Autorzy:
Mężyk, A.
Czapla, T.
Klein, W.
Krzystała, E.
Gembalczyk, G.
Domagała, D.
Dudek, O.
Tematy:
autonomous vehicles
machine design
utility vehicles
hybrid drive
Pokaż więcej
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Powiązania:
https://bibliotekanauki.pl/articles/245027.pdf  Link otwiera się w nowym oknie
Opis:
The article discusses the role of the modern approach to the design of autonomous utility vehicles. The study has been exemplified by a currently designed multi-purpose hybrid engineer vehicle. The article covers the application of modern hybrid drive and the suspension allowing for the regulation of the tension wheel. The drive system used in the described vehicle is a serial type. In contrast to the conventional solutions used so far in a similar vehicle, this system eliminate heavy and difficult parts to produce (e.g., gears) which allows to significant reduction of a vehicle's weight. The suspension system is based on the classical concept - with a torsional shafts. A movable tension wheel is an innovative element, which has been used in this suspension system. When the wheel is in the lower position the area of pressure increased so the force exerted on the ground is less. This option is useful in difficult, muddy off-road conditions. The Volvo Company wants to apply similar capabilities in their prototype diggers. In the article, the importance of the external appearance of the vehicle has been considered as well. A removable cab allows the remote control of the vehicle at any time and the same has been provided as an example of a modern solution concerning the external appearance of the vehicle.
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-10 z 72

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