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Wyświetlanie 1-15 z 16
Tytuł:
Numerical loss analysis in a compressor cascade with leading edge tubercles
Autorzy:
Zheng, T.
Qiang, X.-Q.
Teng, J.-F.
Teng, J.-Z.
Powiązania:
https://bibliotekanauki.pl/articles/280966.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
compressor cascade
flow separation
passive flow control
leading edge tubercles
streamwise vortices
loss analysis
Opis:
A numerical analysis of loss has been carried out to explore the loss mechanism of leading edge tubercles in a high speed compressor cascade. Taking the lead from flippers of the humpback whale, tubercles are passive structures of a blade for flow control. Evaluation of the overall performance in terms of entropy increase shows that the loss reduction is achieved both at high negative and high positive incidence angles, while a rise in the loss is obtained near the design point. And a smaller wave number as well as a smaller amplitude results in lower additional losses at the design point. Spanwise and streamwise distributions of pitchwise-averaged entropy increase combined with flow details have been presented to survey the loss development and, subsequently, to interpret the loss mechanism. The tubercle geometry results in the deflection flow and the consequent spanwise pressure gradient. This pressure gradient induces formation of counter-rotating streamwise vortices, transports away the low-momentum fluid near wall from crests towards troughs and leads to local high loss regions behind troughs as well as loss reduction behind the crests in comparison to the baseline. The interaction between these vortices and flow separation by momentum transfer leads to separation delay and the consequent loss reduction at the outlet.
Źródło:
Journal of Theoretical and Applied Mechanics; 2018, 56, 4; 1083-1095
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Calculations of Energy Levels Using the Weakest Bound Electron Potential Model Theory
Autorzy:
Zhang, T.
Zheng, N.
Powiązania:
https://bibliotekanauki.pl/articles/1808081.pdf
Data publikacji:
2009-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
01.55.+b
31.15.-p
Opis:
In this paper, we introduce a new method for calculation of energy levels in detail and give our results for several iso-spectrum-level series as examples: [He] 2s2p $\text{}^{1}P_{1}$, [He] 2s2p $\text{}^{3}P_{0}$, [He] 2s2p $\text{}^{3}P_{2}$, and [He] 2s3s $\text{}^{3}S_{1}$ series of Be-like sequence; [Ne] $\text{}3s^{2}3d$ $\text{}^{2}D_{3//2}$ series and [Ne] $3s^{2}3d$ $\text{}^{2}D_{5//2}$ series of Al-like sequences; [Ne] 4p $\text{}^{2}P_{1//2}$ series, [Ne] 5d $\text{}^{2}D_{5//2}$ series, and [Ne] 6f $\text{}^{2}F_{7//2}$ series of Na-like sequences. In the method I(Z)=$T_\text{lim} (Z)-T(Z,n)$, where I(Z), $T_\text{lim}(Z)$, and T(Z,n) denote ionization potential, series limit, and energy level of a given member, respectively. The expression of non-relativistic part of I(Z) is derived from weakest bound election potential model theory and relativistic effects of I(Z) are included by using a six-order polynomial in Z. Our results are compared with the experimental data and with those obtained by other theoretical method.
Źródło:
Acta Physica Polonica A; 2009, 115, 3; 629-635
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mental health status of frontline clinical nurses fighting the Omicron variant of COVID-19 – a cross-sectional survey in China
Autorzy:
Li, T.
Qiu, X.
Gong, X.
Zhan, R.
Zheng, X.
Powiązania:
https://bibliotekanauki.pl/articles/28761758.pdf
Data publikacji:
2022
Wydawca:
Instytut Medycyny Wsi
Źródło:
Annals of Agricultural and Environmental Medicine; 2022, 29, 3; 375-382
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The cross-sectional survey on COVID-19 vaccine hesitancy and it predictors among Chinese parents of 3–17 years aged children in Shenzhen City
Autorzy:
Li, T.
Qiu, X.
Gong, X.
Zhan, R.
Zheng, X.
Powiązania:
https://bibliotekanauki.pl/articles/28761874.pdf
Data publikacji:
2022
Wydawca:
Instytut Medycyny Wsi
Źródło:
Annals of Agricultural and Environmental Medicine; 2022, 29, 1; 120-125
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fidelity in Quasi-1D Systems as a Probe for Anderson Localization
Autorzy:
Bodyfelt, J.
Zheng, M.
Kottos, T.
Kuhl, U.
Stöckmann, H.
Powiązania:
https://bibliotekanauki.pl/articles/1585120.pdf
Data publikacji:
2009-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.25.Dd
72.15.Rn
03.65.Nk
03.65.Yz
Opis:
We analyze the echo dynamics in quasi-one-dimensional random media to investigate how the transition from localization to delocalization is encoded in its temporal decay properties. Our analysis extends from the standard perturbative regime corresponding to small perturbations (with respect to the mean level spacing) in the echo dynamics, out to the Wigner decay regime. On the theoretical side, our results rely on a banded random matrix modeling, and show in the localized regime under small perturbations a novel decay of the fidelity (Loschmidt echo), differing from the typical Gaussian decay seen within both diffusive and chaotic systems. For larger perturbation strengths, typical Wigner exponential decays are observed. Scattering echo measurements are performed experimentally within a quasi-1D microwave cavity randomly populated with point-like scatterers. Agreements are observed between experiments, numerics, and theoretical predictions.
Źródło:
Acta Physica Polonica A; 2009, 116, 5; 756-764
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Cone Size on the Bonding Strength of Bimetallic Composite Pipes Produced by Drawing Approach
Autorzy:
Zheng, M.
Zhao, T.
Gao, H.
Teng, H.
Hu, J.
Powiązania:
https://bibliotekanauki.pl/articles/352274.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
bi-metallic composite pipe
drawing approach
cone size
interfacial bonding strength
ideal elastoplastic
Opis:
The effect of cone size on interfacial bonding strength of bimetallic composite pipe manufactured by drawing approach is studied on base of the plane strain assumption and ideal elastic-plastic model, a simple expression for the effect of cone size on the bonding strength of bimetallic composite pipes is proposed. The agreement of the predicted results with the experimental results shows the reliability.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 1; 451-456
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Aspects of the Scattering and Impedance Properties of Chaotic Microwave Cavities
Autorzy:
Hemmady, S.
Zheng, X.
Antonsen, T.
Ott, E.
Anlage, S. M.
Powiązania:
https://bibliotekanauki.pl/articles/2044605.pdf
Data publikacji:
2006-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
05.45.Mt
03.65.Nk
11.55.-m
03.50.De
84.40.-x
84.40.Az
Opis:
We consider the statistics of the impedance Z of a chaotic microwave cavity coupled to a single port. We remove the non-universal effects of the coupling from the experimental Z data using the radiation impedance obtained directly from the experiments. We thus obtain the normalized impedance whose probability density function is predicted to be universal in that it depends only on the loss (quality factor) of the cavity. We find that impedance fluctuations decrease with increasing loss. The results apply to scattering measurements on any wave chaotic system.
Źródło:
Acta Physica Polonica A; 2006, 109, 1; 65-71
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Generation of chirped microwave signal with any central frequency based on a nonuniformly spaced finite impulse response filter
Autorzy:
Chen, D.
Wang, R.
Pu, T.
Xiang, P.
Fang, T.
Zheng, J.
Xiong, J.
Powiązania:
https://bibliotekanauki.pl/articles/174334.pdf
Data publikacji:
2016
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
microwave photonics
microwave photonic filter
chirped microwave signal
dual drive Mach–Zehnder modulator
Opis:
A novel optical approach to generating a chirped microwave signal by using a nonuniformly spaced finite impulse response filter is proposed and demonstrated. In this scheme, a narrowband Gaussian pulse is used as the original chirped-free signal, which is easy to be acquired. To eliminate the need of a wideband chirped-free signal, a mixer and a radio frequency signal are used to up-convert the spectrum of the original Gaussian signal. Therefore, the required frequency response can be calculated and reconstructed by a finite impulse response filter with nonuniformly spaced taps. Besides, a dual drive Mach–Zehnder modulator is used to realize single sideband modulation of the chirpedfree signal. Thus, the transfer function induced by the fiber dispersion is eliminated and the chirped microwave signal with any central frequency can be generated. In this paper, a design example of a filter with a central frequency of 10GHz is provided, and generation of the target chirped microwave signal is also demonstrated by numerical simulations.
Źródło:
Optica Applicata; 2016, 46, 3; 399-408
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental investigation and modelling of hot forming B₄C/AA6061 low volume fraction reinforcement composites
Autorzy:
Zheng, K.
Lin, J.
Wu, G.
Hall, R. W.
Dean, T. A.
Powiązania:
https://bibliotekanauki.pl/articles/280433.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
Metal Matrix Composite (MMC)
hot compression
AA6061
B₄C
dislocation
Opis:
This paper presents an experimental investigation of the hot deformation behaviour of 15% B₄C particle reinforced AA6061 matrix composites and the establishment of a novel corresponding unified and physically-based visco-plastic material model. The feasibility of hot forming of a metal matrix composite (MMC) with a low volume fraction reinforcement has been assessed by performing hot compression tests at different temperatures and strain rates. Examination of the obtained stress-strain relationships revealed the correlation between temperature and strain hardening extent. Forming at elevated temperatures enables obvious strain rate hardening and reasonably high ductility of the MMC. The developed unified material model includes evolution of dislocations resulting from plastic deformation, recovery and punching effect due to differential thermal expansion between matrix and reinforcement particles during non-steady state heating and plastic straining. Good agreement has been obtained between experimental and computed results. The proposed material model contributes greatly to a more thorough understanding of flow stress behaviour and microstructural evolution during the hot forming of MMCs.
Źródło:
Journal of Theoretical and Applied Mechanics; 2018, 56, 2; 457-469
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Change in airway inflammatory markers in Danish energy plant workers during a working week
Autorzy:
Zheng, Y.
Schlunssen, V.
Bonlokke, J.
Madsen, A.M.
Skov, S.
Sigsgaard, T.
Powiązania:
https://bibliotekanauki.pl/articles/50565.pdf
Data publikacji:
2014
Wydawca:
Instytut Medycyny Wsi
Opis:
Introduction. It is well known that exposure to organic dust can cause adverse respiratory effect. The pathogen-associated molecular patterns (PAMPS) in the organic dust, such as endotoxin from Gram-negative bacteria cell wall and fungal components, can trigger the release of cytokine (e.g. Interleukin 1β (IL-1β)) and chemokine (e.g. Interleukin 8 (IL-8)) from the immune cells in the airways. Objective. To evaluate the potential inflammatory effects of organic dust exposure in energy plants in Denmark. Materials and methods. Nasal lavage (NAL) and exhaled breath condensate (EBC) were sampled at Monday morning (referred to as before work) and again at Thursday afternoon (referred to as after work). NAL IL-8, EBC pH, IL-1β concentration were measured. Personal exposure to endotoxin and dust was calculated from time spent on different tasks and measured average work area exposures. Results. Before work, workers from biofuel plants had a higher IL-1β and IL-8 concentration compared to conventional fuel plants (control group). Specifically, the IL-1β level of moderately and most exposed group, and IL-8 level of the least exposed group were higher compared to the control group. The changes of IL-1β, pH and IL-8 during a work week were not significant. Workers with rhinitis had a lower percentage change of IL-8 compared to healthy workers. Conclusions. An increased level of EBC IL-1β in biofuel energy plant workers before work indicated a chronic or sub-chronic inflammation. The percentage change of IL-8 was lower in workers with rhinitis compared to healthy workers.
Źródło:
Annals of Agricultural and Environmental Medicine; 2014, 21, 3
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electronic System Fault Diagnosis with Optimized Multi-kernel SVM by Improved CPSO
Diagnoza uszkodzeń układu elektronicznego z wykorzystaniem Wielojądrowej Maszyny Wektorów Nośnych (SVM) zoptymalizowanej przy pomocy poprawionego algorytmu CPSO
Autorzy:
Guo, Y. M.
Wang, X. T.
Liu, C.
Zheng, Y. F.
Cai, X. B.
Powiązania:
https://bibliotekanauki.pl/articles/300922.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Tematy:
układ elektroniczny
diagnoza uszkodzeń
maszyna wektorów nośnych
optymalizacja metodą chaosu-roju cząstek
funkcja wielojądrowa
electronic system
fault diagnosis
support vector machine (SVM)
chaos particles swarm optimization
multi-kernel
Opis:
Bezpieczeństwo pracy układów elektronicznych stało się kluczowym zagadnieniem w odniesieniu do złożonych układów o wysokiej niezawodności. Obecnie coraz większy nacisk kładzie się na trafność diagnozy uszkodzeń układów elektronicznych. Na podstawie charakterystyki diagnozy uszkodzeń układów elektronicznych, opracowaliśmy model wielokryterialnej klasyfikacji SVM pozwalający osiągnąć lepszą trafność diagnozy uszkodzeń. Model wykorzystuje funkcję wielojądrową składającą się z kilku bazowych funkcji jądrowych pozwalającą na zwiększenie interpretowalności modelu klasyfikacyjnego. Aby zoptymalizować działanie modelu wielokryterialnej klasyfikacji SVM wykorzystującego funkcję wielojądrową, udoskonaliliśmy algorytm Optymalizacji Metodą Chaosu-Roju Cząstek (CPSO), co pozwoliło osiągnąć optymalne parametry SVM i funkcji wielojądrowej. W poprawionym algorytmie CPSO wzmocniono różnorodność wyszukiwania poprzez wykorzystanie chaotycznej sekwencji generowanej przez zmodyfikowaną mapę tent, a także włączono do standardowego algorytmu PSO efektywną metodę pozwalającą uniknąć przedwczesnej stagnacji oraz uzyskać globalne wartości optymalizacji. Wyniki symulacji diagnozy uszkodzeń systemu elektronicznego pokazują, że proponowany system optymalizacji może być wykorzystywany jako skuteczna metoda umożliwiająca znaczne zwiększenie trafności diagnozy uszkodzeń z wykorzystaniem wielojądrowej SVM.
Electronic systems’ safety operation has become a key issue to complex and high reliability systems. Now more emphasis has been laid on the accuracy of electronic system fault diagnosis. Based on the characteristics of the electronic system fault diagnosis, we design a multi-classification SVMs model to attain better fault diagnosis accuracy, which utilizes multi-kernel function consisting of several basis kernel functions to enhance the interpretability of the classification model. In order to optimize the performance of multi-classification SVMs with multi-kernel, we improve the Chaos Particles swarm Optimization (CPSO) algorithm to achieve the optimum parameters of SVMs and the multi-kernel function. For the improved CPSO algorithm, a modified Tent Map chaotic sequence is used to strengthen the search diversity, and an effective method is embedded to the stander PSO algorithm which can ensure to avoid premature stagnation and obtain the global optimization values. The fault diagnosis simulation results of an electronic system show the proposed optimization scheme is a feasible and effective method and it can significantly improve the fault diagnosis accuracy of the multi-kernel SVM.
Źródło:
Eksploatacja i Niezawodność; 2014, 16, 1; 85-91
1507-2711
Pojawia się w:
Eksploatacja i Niezawodność
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dispersion-compensating en/decoder for a time-spreading/wavelength-hopping optical code-division multiplexing (OCDM) system
Autorzy:
Zheng, J.
Wang, R.
Pu, T.
Lu, L.
Fang, T.
Su, Y.
Li, L.
Yang, Q.
Chen, X.
Powiązania:
https://bibliotekanauki.pl/articles/174365.pdf
Data publikacji:
2013
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
optical code-division multiplexing (OCDM)
fiber Bragg grating (FBG)
dispersion
Opis:
A novel dispersion-compensating fiber Bragg grating (FBG)-based en/decoder is proposed to compensate both the out-band and in-band dispersion in a time-spreading/wavelength-hopping (TS/WH) optical code-division multiplexing (OCDM) system. The experimental realization of such en/decoders only needs a uniform-pitch phase mask and a sub-micrometer precision moving stage. Such an en/decoder pair with the ability of compensating the dispersion of transmission in 20-km single mode fiber (SMF) is simulated and experimentally fabricated. Both the simulation and experimental results show that the decoded pulse can be recovered without any distortion owing to the elimination of dispersion.
Źródło:
Optica Applicata; 2013, 43, 3; 485-495
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Superconducting density of states in B-doped diamond
Autorzy:
Onufriienko, O.
Samuely, T.
Zhang, G.
Vanacken, J.
Xu, Zheng
May, P.
Szabó, P.
Moshchalkov, V.
Samuely, P.
Powiązania:
https://bibliotekanauki.pl/articles/1052993.pdf
Data publikacji:
2017-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.70.Wz
74.62.En
74.55.+v
Opis:
In the presented work, we investigated the superconducting boron doped diamond polycrystalline film prepared by chemical vapor deposition by means of scanning tunneling microscopy/spectroscopy. Differential conductance spectra measured at various temperatures were used to obtain the values of superconducting critical temperature and energy gap. Comparing various theoretical models fitted to the differential conductance spectra measured at 0.5 K suggests weak pair breaking. However, this cannot account for the high 2Δ/(k_{B}T_{C}) ratio, which therefore indicates strong coupling.
Źródło:
Acta Physica Polonica A; 2017, 131, 4; 1033-1035
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characterization of epitaxial LSMO films grown on STO substrates
Autorzy:
Španková, M.
Štrbík, V.
Chromik, Š.
Zheng, D.
Li, J.
Machajdík, D.
Kobzev, A.
Plecenik, T.
Sojková, M.
Powiązania:
https://bibliotekanauki.pl/articles/1054697.pdf
Data publikacji:
2017-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.37.Ps
75.47.Lx
75.70.Ak
81.15.Fg
Opis:
Epitaxial manganite La_{0.67}Sr_{0.33}MnO₃ (LSMO) layers, with a thickness of 20-50 nm, are prepared on single crystal (001) SrTiO₃ (STO) substrates by pulsed laser deposition technique. Structural characterization (composition analysis, surface morphology), investigated by the Rutherford backscattering spectroscopy and atomic force microscopy, reveals the growth of stoichiometric LSMO films with a smooth surface (root-mean-square value of 0.21-1.6 nm). The prepared LSMO films possess high Curie temperature ( ≈ 412 K), low room temperature resistivity (1-2 mΩ cm) and maximum of temperature coefficient of resistivity TCR = 2.7% K¯¹ at 321 K.
Źródło:
Acta Physica Polonica A; 2017, 131, 4; 848-850
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Free chlorine loss during spraying of membraneless acidic electrolyzed water and its antimicrobial effect on airborne bacteria from poultry house
Autorzy:
Zhao, Y.
Xin, H.
Zhao, D.
Zheng, W.
Tian, W.
Ma, H.
Liu, K.
Hu, H.
Wang, T.
Soupir, M.
Powiązania:
https://bibliotekanauki.pl/articles/49243.pdf
Data publikacji:
2014
Wydawca:
Instytut Medycyny Wsi
Źródło:
Annals of Agricultural and Environmental Medicine; 2014, 21, 2
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
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