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    Wyświetlanie 1-12 z 12
    Tytuł:
    Influence of cooling lubricants on the surface roughness and energy efficiency of the cutting machine tools
    Autorzy:
    Jersák, J.
    Simon, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/265834.pdf
    Data publikacji:
    2017
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    machining
    turning
    milling
    process fluids
    minimum quantity lubrication
    chropowatość powierzchni
    smar chłodzący
    narzędzia skrawające
    obróbka skrawaniem
    Opis:
    The Technical University of Liberec and Brandenburg University of Technology Cottbus-Senftenberg investigated the influence of cooling lubricants on the surface roughness and energy efficiency of cutting machine tools. After summarizing the achieved experimental results, the authors conclude that cooling lubricants extensively influence the cutting temperature, cutting forces and energy consumption. Also, it is recognizable that cooling lubricants affect the cutting tools lifetime and the workpiece surface quality as well. Furthermore, costs of these cooling lubricants and the related environmental burden need to be considered. A current trend is to reduce the amount of lubricants that are used, e.g., when the Minimum Quantity Lubrication (MQL) technique is applied. The lubricant or process liquid is thereby transported by the compressed air in the form of an aerosol to the contact area between the tool and workpiece. The cutting process was monitored during testing by the three following techniques: lubricant-free cutting, cutting with the use of a lubricant with the MQL technique, and only utilizing finish-turning and finish-face milling. The research allowed the authors to monitor the cutting power and mark the achieved surface quality in relation to the electrical power consumption of the cutting machine. In conclusions, the coherence between energy efficiency of the cutting machine and the workpiece surface quality regarding the used cooling lubricant is described.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2017, 22, 3; 779-787
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Public transport services in Hong Kong: A voice from Hong Kong Citizen (Policy Paper)
    Autorzy:
    Yuen, Simon S.M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2141009.pdf
    Data publikacji:
    2019
    Wydawca:
    Fundacja Centrum Badań Socjologicznych
    Tematy:
    public transport
    railway
    private car
    Hong Kong
    Opis:
    Hong Kong is a city with a diversified public transport system. However, the number of private cars has increased abnormally, especially the completion of private housings in the New Territories and North Lantau, due to the daily work of the urban areas or personal needs. The number of citizens of private cars has increased significantly. In recent years, the problem of "frequent and severe congestion" has resulted in the saturation of the more timely railways. The main reason is that the roads in the existing busy areas cannot meet the large number of private cars, and the major roads in the New Territories of Hong Kong and Kowloon have been subject to "frequent and severe congestion". The Government's solution to the problem is to build roads and railways only. In recent years, many new roads and railways, the congestion of old roads and highways have not been improved. Railways cannot change the private car owners to switch to public transport habits, “but increased”, what is the main reason? Where roads and railways solve problems, this study agrees that denser areas without rail services are necessary to build or extend existing rail routes. But what is the need to build a new railway to relieve the existing railway saturation? We use the railway but not others? Is railway extension is one of the cause for traffic congestion? In recent years, the government has recognized that private cars are the main source of traffic congestion in Hong Kong. Government indicated that it planned to introduce another electronic road toll and increase private license plate or registration tax. Hope that this report will help us understand the problems we are facing now and discuss how we can resolve them so as to come up with better solutions.
    Źródło:
    Journal of Sustainable Development of Transport and Logistics; 2019, 4, 2; 21-31
    2520-2979
    Pojawia się w:
    Journal of Sustainable Development of Transport and Logistics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Influence of the Au Nanoparticles Dimension on the Photocatalytic Performances of $TiO_2-Au$ Porous Composites
    Autorzy:
    Melinte, G.
    Baia, M.
    Georgescu, D.
    Baia, L.
    Iancu, V.
    Diamandescu, L.
    Popescu, T.
    Cotet, L.
    Barbu-Tudoran, L.
    Danciu, V.
    Simon, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1491327.pdf
    Data publikacji:
    2012-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.Rm
    81.07.Wx
    82.80.Ej
    68.37.Lp
    82.65.+r
    82.50.Hp
    Opis:
    The influence of Au nanoparticles dimension on the photocatalytic performances of the $TiO_2$ aerogels-Au composites was evaluated. Structural and morphological peculiarities of the $TiO_2$ aerogel, unloaded and loaded with 5 and 22 nm Au nanoparticles, were studied by transmission electron microscopy technique, X-ray diffraction and $N_2$-sorption measurements. UV-Vis diffuse reflectance measurements were performed to determine the band gap energies. The photocatalytic activity was evaluated by monitoring the salicylic acid photodegradation. It was found that the Au nanoparticles promote the anatase phase crystallization and produce the decrease of the specific surface area and band gap energy values. The porous composite with the smallest Au nanoparticles dimension exhibits the best photocatalytic performances.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 1; 208-210
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Catshark egg capsules from a Late Eocene deep-water methane-seep deposit in western Washington State, USA
    Autorzy:
    Kiel, S.
    Peckmann, J.
    Simon, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/21852.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    catshark
    egg capsule
    fossil
    Late Eocene
    Eocene
    deep water
    methane-seep deposit
    Washington State
    USA
    Elasmobranchia
    Scyliorhinidae
    taphonomy
    exceptional preservation
    collagen
    Opis:
    Fossil catshark egg capsules, Scyliorhinotheca goederti gen. et sp. nov., are reported from a Late Eocene deep−water methane−seep calcareous deposit in western Washington State, USA. The capsules are preserved three−dimensionally and some show mineralized remnants of the ribbed capsule wall consisting of small globular crystals that are embedded in a microsparitic matrix. The globules are calcitic, but a strontium content of 2400–3000 ppm suggests that they were origi− nally aragonitic. The carbonate enclosing the egg capsules, and the capsule wall itself, show 13C values as low as −36.5‰, suggesting that formation was induced by the anaerobic oxidation of methane and hence in an anoxic environ− ment. We put forward the following scenario for the mineralization of the capsule wall: (i) the collagenous capsules expe− rienced a sudden change from oxic to anoxic conditions favouring an increase of alkalinity; (ii) this led to the precipitation of aragonitic globules within the collagenous capsule wall; (iii) subsequently the remaining capsule wall was mineralized by calcite or aragonite; (iv) finally the aragonitic parts of the wall recrystallized to calcite. The unusual globular habit of the early carbonate precipitates apparently represents a taphonomic feature, resulting from mineralization mediated by an organic matrix. Taphonomic processes, however, are at best contributed to an increase of alkalinity, which was mostly driven by methane oxidation at the ancient seep site.
    Źródło:
    Acta Palaeontologica Polonica; 2013, 58, 1
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Septoria leaf blotch and its control with commercial fungicides, on rbuscular-mycorrhizal-fungal colonization, spore numbers, and morphotype diversity
    Autorzy:
    Schalamuk, S.
    Velazquez, S.
    Simon, M.R.
    Cabello, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/65863.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Opis:
    Arbuscular-mycorrhizal internal structures (i.e. total root colonization, arbuscules, vesicles) and external structures (i.e. spore density), and Glomeromycota spore morphotypes, were evaluated in wheat severely infected with Mycosphaerella graminicola - the causal agent of Septoria leaf blotch. Plots in which the infection was controlled with a commercial fungicide at recommended field doses, were also examined. The commercial fungicide used was an admixture of trifloxistrobin and tebuconazole. No negative effects of the fungicide application on arbuscular-mycorrhizal fungi (AMF) were found. The M. graminicola fungicidal treatment actually favoured the formation of arbuscules and AMF spores, as there was a selective increase in the density of spores belonging to the glomoid morphotype. Arbuscular-mycorrhizal fungi have an absolute dependence on the carbon provided by the plant. A severe foliar disease leading to a diminished carbon supply to the roots would generate decreases in carbon availability. Such decreases would strongly affect mycorrhizal associations and development. Furthermore, the change in the green-leaf area produced by a severe foliar disease and/or a reversal of that condition through fungicide treatment could result in shifts in the composition of the AMF community so as to favour glomoid morphotypes. Glomoid species have been previously considered as r-strategists.
    Źródło:
    Journal of Plant Protection Research; 2014, 54, 1
    1427-4345
    Pojawia się w:
    Journal of Plant Protection Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Adherence Properties of Acrylic Bone Cement to Alumina Ceramics Designed for Clinical Applications
    Autorzy:
    Cavalu, S.
    Simon, V.
    Akin, I.
    Goller, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/1293601.pdf
    Data publikacji:
    2014-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    87.85.jf
    Opis:
    The aim of this study is to investigate the adherence properties of acrylic cement based on PMMA to alumina ceramics. These ceramics are suitable for orthopedic and dental applications, as bioinert components in prosthetic surgery. The surface of alumina specimens were subjected to a special treatment based on acid etched followed by two different fluoride treatments: $SnF_2$ and $NaBF_4$, respectively. The structural properties of $Al_2O_3$ specimens were investigated before any treatments by X-ray diffraction, Fourier transform infrared spectroscopy and scanning electron microscopy. The modification occurred after the chemical treatment was investigated by X-ray photoelectron spectroscopy. The adherence of commercial acrylic cement to both treated alumina specimens was evaluated by scanning electron microscopy upon transversal cutting of the specimens. The results demonstrated that $SnF_2$ is more favorable with respect to adhesion of PMMA based orthopedic cements.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 2; 603-605
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Polish Jewish officers who were killed in Katyn : on ongoing investigation in light of dokuments recently released by the USRR
    Autorzy:
    Schochet, Simon.
    Powiązania:
    The Holocaust in the Soviet Union : studies and sources on the destruction on the Jews in the Nazi - Occupied Territories of the USRR, 1941-1945 Armonk, 1993 S. 237-247
    Współwytwórcy:
    Dobroszycki Lucjan. Redakcja
    Gurock, Jeffrey S. Redakcja
    Pipes, Richard. Tłumaczenie
    Data publikacji:
    1993
    Tematy:
    Egzekucja polskich oficerów w Katyniu Żydzi źródła
    Dostawca treści:
    Bibliografia CBW
    Artykuł
    Tytuł:
    Coccidiosis of domestic pigeons (Columba livia domestica Gmelin, 1789) in Kano State, Nigeria
    Autorzy:
    Mohammed, Balarabe R.
    Simon, Malang K.
    Agbede, Rowland I.S.
    Arzai, Auwalu H.
    Powiązania:
    https://bibliotekanauki.pl/articles/972275.pdf
    Data publikacji:
    2017
    Wydawca:
    Polskie Towarzystwo Parazytologiczne
    Tematy:
    coccidiosis
    Columbia livia domestica
    Eimeria spp.
    Opis:
    Pigeon coccidiosis is caused by Eimeria spp., a protozoan parasite which limits productivity by causing severe illness. Although numerous studies have been conducted on the coccidiosis of pigeons in some parts of Nigeria, there is no published data from Kano State. The intestinal contents of 144 pigeons (72 females and 72 males) were analysed for Eimeria oocysts in 2007 from 12 Local Government Areas of Kano State over the period of six months including the dry (February–April) and wet (June–August) seasons. The pigeons were divided into three groups according to age: squabs (0–4 weeks), squeakers (5–8 weeks) and youngsters (9+ weeks); each group including 48 pigeons. The results of these studies revealed an overall prevalence of 19.44%. The prevalence was higher in females (20.83%) than males (18.06%) (p<0.05). Furthermore, squabs had the highest prevalence (27.08%) followed by squeakers (20.83%), and youngsters (10.42%) (p<0.05). Infection with Eimeria spp. oocysts was higher during the wet season (8.96%) than dry season (5.98%) (p<0.05). This study provides basic information on the first detection of coccidiosis of pigeons in Kano State, Nigeria which has an implication on the sustainable pigeon production for human protein reguirement.
    Źródło:
    Annals of Parasitology; 2017, 63, 3; 199-203
    0043-5163
    Pojawia się w:
    Annals of Parasitology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Interplay between ROS and RNS in tobacco response to cryptogein
    Autorzy:
    Kulik, A.
    Koen, E.
    Noirot, E.
    Bourque, S.
    Wendehenne, D.
    Simon-Plas, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/81080.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    conference
    hypersensitive response
    tobacco
    cryptogein
    reactive oxygen species
    nitric oxide
    Źródło:
    BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2013, 94, 2
    0860-7796
    Pojawia się w:
    BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structural, 1/f Noise and MOKE Characterization of Vicinal La$\text{}_{0.7}$Sr$\text{}_{0.3}$MnO$\text{}_{3}$ Thin Films
    Autorzy:
    Méchin, L.
    Perna, P.
    Saïb, M.
    Belmeguenai, M.
    Flament, S.
    Barone, C.
    Routoure, J.-M.
    Simon, Ch.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047216.pdf
    Data publikacji:
    2007-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.30.Gw
    75.47.Lx
    75.60.-d
    75.60.Jk
    75.70.Ak
    Opis:
    This paper presents some structural, magnetic and electrical properties of 40 nm and 75 nm thick La$\text{}_{0.7}$Sr$\text{}_{0.3}$MnO$\text{}_{3}$ thin films deposited on vicinal SrTiO$\text{}_{3}$(001) substrates. The vicinal angles were 2, 4, 6, 8, and 10º from the [001] direction towards [110]. Standard SrTiO$\text{}_{3}$(001) substrates were used for comparison and for the growth condition optimization. Structural properties were studied by X-ray diffraction, which indicated that the LSMO films grew with their (001) axis coincident with the (001) axis of the substrate. The surface morphology was carefully studied by atomic force microscopy in tapping mode. Very smooth films and regular step-terrace structures on the La$\text{}_{0.7}$Sr$\text{}_{0.3}$MnO$\text{}_{3}$ surfaces could be observed. The root mean square roughness measured in 2μ m×2μ m images was in the 0.130-0.580 nm range for all angles and both thicknesses. Superconducting quantum interference device magnetometer measurements revealed a Curie temperature in the 340-350 K range and magneto-optical Kerr microscopy enabled magnetic domain imaging and hysteresis loop measurements at 300 K. A uniaxial easy magnetization direction was obtained at 300 K for angles above 4º, with the easy axis along the steps. Finally, preliminary 1/f noise measurements were performed at 300 K for bias currents along and perpendicular to the step direction, showing a noise level as low as that we typically measured on standard SrTiO$\text{}_{3}$(001) substrates. All these results are promising for the future realization of room-temperature devices making use of the anisotropy of the magnetization.
    Źródło:
    Acta Physica Polonica A; 2007, 111, 1; 63-70
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microstructure And Mechanical Properties Of Al-WC Composites
    Mikrostruktura i właściwości mechaniczne kompozytów Al-WC
    Autorzy:
    Simon, A.
    Lipusz, D.
    Baumli, P.
    Balint, P.
    Kaptay, G.
    Gergely, G.
    Sfikas, S.
    Lekatou, A.
    Karantzalis, A.
    Gacsi, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/352222.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    composite
    aluminium
    WC
    microstructure
    mechanical properties
    kompozyt
    mikrostruktura
    właściwości mechaniczne
    Opis:
    The scope of the research work is the production and characterization of Al matrix composites reinforced with WC ceramic nanoparticles. The synthesis process was powder metallurgy. The produced composites were examined as far as their microstructure and mechanical properties (resistance to wear, micro/macrohardness). Intermetallic phases (Al12W and Al2Cu) were identified in the microstrucutre. Al4C3 was not detected in the composites. Adding more than 5 wt% WC to the aluminum, microhardness and wear resistance exceed the values of Al alloy. Composites having weak interface bond performed the highest wear rate.
    Źródło:
    Archives of Metallurgy and Materials; 2015, 60, 2B; 1517-1521
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-12 z 12

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