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Wyświetlanie 1-10 z 95
Tytuł:
Marine industrial cluster structure and its coupling relationship with urban development: a case of Shandong province
Autorzy:
Xiao, W.
Zhao, B.
Wang, L.
Tematy:
marine industry
industrial cluster
urban development
coupling coordination model
Pokaż więcej
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Powiązania:
https://bibliotekanauki.pl/articles/259796.pdf  Link otwiera się w nowym oknie
Opis:
Marine economy is a new economic form, emphasizing new development concept, new operation mechanism and management mode. In recent years, marine economy shows rapid growth, and marine industry presents a clustering development trend. The industrial linkage effect, industrial agglomeration effect and industrial radiation effect of the marine industrial cluster are important motive forces for the development of coastal cities. The marine industrial cluster takes coastal cities as the development platform and space, while the coastal cities achieve rapid and sustainable development based on the marine industrial cluster. The synergetic and coupling development of the marine industrial cluster and coastal cities is an important way for the promotion of industrial competitiveness and urban competitiveness. This paper developed a measure to identify the marine industrial cluster, designed the evaluation index of coupling of marine industrial cluster and coastal cities development from two perspectives of industrial linkage and spatial agglomeration, taking Shandong province, a typical coastal province in China, as an example, it studied the situation of the marine industrial cluster based on input-output data and data of marine enterprises of coastal cities, based on which it explored the coupling relationship between marine industrial cluster and coastal cities of Shandong province.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermal conductivity of a Brown Earth soil as affected by biochars derived at different temperatures: Experiment and prediction with the Campbell model
Autorzy:
Zhao, B.
Li, L.
Zhao, Y.
Zhang, X.
Tematy:
biochar
bulk density
thermal conductivity
Brown Earth soil
Campbell model
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Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Powiązania:
https://bibliotekanauki.pl/articles/2082959.pdf  Link otwiera się w nowym oknie
Opis:
Thermal conductivity is a significant heat transfer property of soil. However, the influence of biochar on this property is not well known. In this research, the influence of corn straw biochars prepared at 300, 500 and 700oC on the thermal conductivity of a Brown Earth (Hapli-Udic Cambisol, FAO) soil and its prediction using a Campbell model was examined. The outcomes revealed that the bulk densities of the soil markedly decreased with increases in the biochar amendment rates of 1, 3, and 5% in linear patterns. The reduction in bulk density was mainly attributed to an increase in soil porosity and organic carbon content. With increasing volumetric water contents (10, 20, 30 and 40%), the thermal conductivity of the soils significantly increased, whereas those of soils with biochar amendment were obviously less than that of the CK and the differences increased with the biochar application rates. The pyrolysis temperature of biochar exhibited a negligible effect on the bulk density and thermal conductivity of soils at large. Combining the linear reduction of bulk density with the biochar amendment rate into the Campbell model, well-fitting results for the variation inthermal conductivity versus volumetric water content were obtained and accurate values could be predicted.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Anatomy of the Early Cretaceous enantiornithine bird Rapaxavis pani
Autorzy:
O'Connor, J.K.
Chiappe, L.M.
Gao, C.
Zhao, B.
Tematy:
anatomy
Early Cretaceous
enantiornithine bird
bird
Rapaxavis pani
Aves
Enantiornithes
Longipterygidae
Rapaxavis
Jiufotang Formation
Cretaceous
China
paleontology
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Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Powiązania:
https://bibliotekanauki.pl/articles/21083.pdf  Link otwiera się w nowym oknie
Opis:
The exquisitely preserved longipterygid enantiornithine Rapaxavis pani is redescribed here after more extensive preparation. A complete review of its morphology is presented based on information gathered before and after preparation. Among other features, Rapaxavis pani is characterized by having an elongate rostrum (close to 60% of the skull length), rostrally restricted dentition, and schizorhinal external nares. Yet, the most puzzling feature of this bird is the presence of a pair of pectoral bones (here termed paracoracoidal ossifications) that, with the exception of the enantiornithine Concornis lacustris, are unknown within Aves. Particularly notable is the presence of a distal tarsal cap, formed by the fusion of distal tarsal elements, a feature that is controversial in non−ornithuromorph birds. The holotype and only known specimen of Rapaxavis pani thus reveals important information for better understanding the anatomy and phylogenetic relationships of longipterygids, in particular, as well as basal birds as a whole.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Polytetrafluorethylene on the Mechanical and Safety Properties of a Composite Modified Double Base Propellant
Autorzy:
Sun, S.
Zhang, T.
Zhao, B.
Zhang, G.
Li, X.
Luo, Y.
Tematy:
PTFE fibres
CMDB propellant
mechanical properties
mechanical sensitivity
combustion
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Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Powiązania:
https://bibliotekanauki.pl/articles/358296.pdf  Link otwiera się w nowym oknie
Opis:
A novel Composite Modified Double Base (CMDB) propellant, formed by mechanically mixing aluminium/polytetrafluorethylene (Al/PTFE) powders, was prepared through a rolling process. A variety of tests, such as tensile properties, particle size analysis etc., were carried out to study the influence of PTFE on the CMDB propellant properties. The PTFE deformed from particles to fibres under a uniform shear force, forming a fibre network which greatly improved the propellant’s mechanical properties. Compared to that of the CMDB propellant without PTFE, the elongation of the propellant containing 6% PTFE was increased by 26 times, and moreover, the impact strength was enhanced by 326% at −40 °C. Significantly, the propellant friction and impact sensitivities were reduced by 75.8% and 35.6%, respectively. In addition, the presence of PTFE in the propellant resulted in fluorination of the Al. The gaseous combustion product AlF3 reduced the propellant combustion agglomeration. Consequently, PTFE significantly promoted the propellant’s mechanical performance, decreased the shock (friction, impact) sensitivity and reduced combustion agglomeration.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Measurement of doublepolarization asymmetries in the quasi-elastic $^{3}\vec{He} \left ( \vec{e}, {e}d \right )$ process
Autorzy:
Pan, K.
Annand, J. R. M.
John, J. St.
Khanal, H. P.
Qui, X.
Posik, M.
Širca, S.
Dutta, C.
Ye, Z.
Golak, Jacek
Flay, D.
Nanda, S.
Averett, T.
Zhang, Y.
Muangma, N.
Jiang, X.
Schoenrock, B.
Allada, K.
Deur, A.
El Fassi, L.
Cates, G. D.
Monaghan, P.
LeRose, J.
Zhan, X.
Riordan, S.
Wang, Y.
Puckett, A. J. R.
Jensen, E.
Glamazdin, O.
Canan, M.
King, P.
Qian, X.
Parno, D.
Witała, Henryk
Mihovilovič, M.
Gao, H.
de Jager, C. W.
Lindgren, R.
Saha, A.
De Leo, R.
Garibaldi, F.
Viviani, M.
Tireman, W.
Kang, H.
Hansen, O.
Watson, J.
Zhao, B.
Gomez, J.
Sulkosky, V.
Long, E.
Lu, H.-J.
Zhu, L.
Qiang, Y.
Boeglin, W.
Gilad, S.
Chudakov, E.
Higinbotham, D. W.
Luo, W.
Moffit, B.
Shabestari, M.
Markowitz, P.
Sawatzky, B.
Subedi, R.
Huang, J.
Chen, C.
Gilman, R.
Kievsky, A.
Holmstrom, T.
Golge, S.
Anderson, B.
Chen, J. P.
Skibiński, Roman
Korsch, W.
Punjabi, V.
Deng, X.
Bradshaw, P.
Schiavilla, R.
Sauer, P. U.
Deltuva, A.
Jones, M.
Marcucci, L. E.
Shahinyan, A.
Urciuoli, G. M.
Wang, D.
Michaels, R.
Tobias, W. A.
Meziane, M.
Zhang, Y.-W.
Katich, J.
Piasetzky, E.
Norum, B. E.
Jin, G.
Wang, K.
Frullani, S.
Wojtsekhowski, B.
Ibrahim, H.
Camsonne, A.
Zheng, X.
Opis:
We present a precise measurement of double-polarization asymmetries in the $^{3}\vec{He} \left ( \vec{e}, {e}'d \right )$ reaction. This particular process is a uniquely sensitive probe of hadron dynamics in $^{3}He$ and the structure of the underlying electromagnetic currents. The measurements have been performed in and around quasielastic kinematics at $Q^{2}=0.25(GeV/c)^{2}$ for missing momenta up to 270  MeV/c. The asymmetries are in fair agreement with the state-of-the-art calculations in terms of their functional dependencies on $p_{m}$ and $\omega$ , but are systematically offset. Beyond the region of the quasielastic peak, the discrepancies become even more pronounced. Thus, our measurements have been able to reveal deficiencies in the most sophisticated calculations of the three-body nuclear system, and indicate that further refinement in the treatment of their two-and/or three-body dynamics is required.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
A comparison of burning characteristics of iso-octane and ethanol fuels in an optical SI engine
Autorzy:
Moxey, B.
Cairns, A.
Zhao, H.
Tematy:
ethanol
natural light imaging
isooctane
Pokaż więcej
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Powiązania:
https://bibliotekanauki.pl/articles/242661.pdf  Link otwiera się w nowym oknie
Opis:
Over the next few decades the automotive industry will be faced with a number of challenging decisions as the world’s supply of oil reduces and the global population increases beyond 7 billion. These factors have driven some researchers to look at blending fossil fuels with alternatives such as crop-produced alcohols (or so-called biofuels). The currently reported study was concerned with the combustion characteristics of ethanol-isooctane blended fuels in a specially designed, single cylinder, spark ignition research engine equipped with full bore overhead optical access. The testing was undertaken using port fuel injection (PFI) and was focused on the behaviour of differing ethanol concentrations under varied internal exhaust gas re-circulation levels (IEGR). Simultaneous high speed imaging and in-cylinder pressure data analysis was used to understand the fundamental influence of varying ethanol content on turbulent flame propagation and subsequent mass burning. The resulting images were analysed looking at the speed of the advancing flame and the shape factor of the burning velocity. The initial evidence suggested that under the moderate speeds and loads tested, poor charge mixture preparation associated with ethanol was leading to fast but unstable burn rates. This could be avoided and combustion improved by using increased valve overlap settings, with the hot residuals entering the intake port aiding the full evaporation of the fuel.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pinning synchronization of the drive and response dynamical networks with lag
Autorzy:
Wen, B.
Zhao, M.
Meng, F.
Tematy:
complex networks
lag synchronization
pinning control
Lorenz system
Pokaż więcej
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:
https://bibliotekanauki.pl/articles/229648.pdf  Link otwiera się w nowym oknie
Opis:
This paper investigates the pinning synchronization of two general complex dynamical networks with lag. The coupling configuration matrices in the two networks are not need to be symmetric or irreducible. Several convenient and useful criteria for lag synchronization are obtained based on the lemma of Schur complement and the Lyapunov stability theory. Especially, the minimum number of controllers in pinning control can be easily obtained. At last, numerical simulations are provided to verify the effectiveness of the criteria.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The use of empirical equations for seepage estimation in comparison with observed losses from irrigation canals
Autorzy:
Syed, Naeem S.B
Shuqi, Zhao
Tematy:
empirical equation
equation modification
seepage estimation
seepage loss
seepage rate
Pokaż więcej
Wydawca:
Instytut Technologiczno-Przyrodniczy
Powiązania:
https://bibliotekanauki.pl/articles/27312639.pdf  Link otwiera się w nowym oknie
Opis:
This study analyses and presents a technical comparison of seepage estimation from 11 empirical equations with measured seepage losses by the inflow-outflow method from two lined and unlined secondary irrigation canals sub-divided into different reach lengths. A significant margin of error was observed between empirical and inflowoutflow methods, hence modifications in empirical equations were performed. Results reveal that the average seepage losses observed in unlined and lined canals by inflow-outflow method were 9.15 and 3.89%, respectively. Moreover, only the Chinese equation estimated seepage losses for an unlined canal as similar to observed losses (0.11 m3 ∙s-1) whereas the Indian equation estimated similar results for a lined canal to those observed in the field (0.09 m3∙s-1). However, the rest of empirical equations were modified in accordance with error percentage with regard to the observed losses. The empirical equations were then observed to estimate reliable results of seepage.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical simulation and experimental study on formation of high concentration of H2 generated by gas explosion.
Autorzy:
Lei, B.
Wu, B.
Zhao, Y.
Ashraf, M. A.
Tematy:
gas explosion
high concentration of H2
numerical simulation
explosion experiment
Pokaż więcej
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Powiązania:
https://bibliotekanauki.pl/articles/259802.pdf  Link otwiera się w nowym oknie
Opis:
In coal mine fire rescues, if the abnormal increase of gas concentration occurs, it is the primary thing to analyze the reasons and identify sources of the abnormal forming, which is also the basis of judge the combustion state of fire area and formulate proper fire reliefs. Nowadays, related researches have recognized the methane explosion as the source of high concentration of H2 formation, but there are few studies about the conditions and reaction mechanism of gas explosion generating high concentration of H2.Therefore, this paper uses the chemical kinetic calculation software, ChemKin, and the 20L spherical explosion experimental device to simulate the generating process and formation conditions of H2 in gas explosion. The experimental results show that: the decomposition of water vapor is the main base element reaction (R84) which leads to the generation of H2.The free radical H is the key factor to influence the formation of H2 generated from gas explosion. With the gradual increase of gas explosion concentration, the explosive reaction becomes more incomplete, and then the generating quantity of H2 increases gradually. Experimental results of 20L spherical explosion are consistent with the change trend about simulation results, which verifies the accuracy of simulation analysis. The results of explosion experiments show that when gas concentration is higher than 9%, the incomplete reaction of methane explosion increases which leads to the gradual increase of H2 formation
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-10 z 95

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