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Wyświetlanie 1-15 z 54
Tytuł:
Additive combinations of special operators
Autorzy:
Wu, Pei
Powiązania:
https://bibliotekanauki.pl/articles/1360884.pdf
Data publikacji:
1994
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Opis:
This is a survey paper on additive combinations of certain special-type operators on a Hilbert space. We consider (finite) linear combinations, sums, convex combinations and/or averages of operators from the classes of diagonal operators, unitary operators, isometries, projections, symmetries, idempotents, square-zero operators, nilpotent operators, quasinilpotent operators, involutions, commutators, self-commutators, norm-attaining operators, numerical-radius-attaining operators, irreducible operators and cyclic operators. In each case, we are mainly concerned with the characterization of such combinations and the minimal number of the special operators required in them. We will omit the proofs of most of the results here but give some indication or brief sketch of the ideas behind and point out the remaining open problems.
Źródło:
Banach Center Publications; 1994, 30, 1; 337-361
0137-6934
Pojawia się w:
Banach Center Publications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Isometries of Musielak-Orlicz spaces II
Autorzy:
Jamison, J. E.
Kamińska, A.
Lin, Pei-Kee
Powiązania:
https://bibliotekanauki.pl/articles/1292975.pdf
Data publikacji:
1993
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Opis:
A characterization of isometries of complex Musielak-Orlicz spaces $L_Φ$ is given. If $L_Φ$ is not a Hilbert space and $U : L_Φ → L_Φ$ is a surjective isometry, then there exist a regular set isomorphism τ from (T,Σ,μ) onto itself and a measurable function w such that U(f) = w ·(f ∘ τ) for all $f ∈ L_Φ$. Isometries of real Nakano spaces, a particular case of Musielak-Orlicz spaces, are also studied.
Źródło:
Studia Mathematica; 1993, 104, 1; 75-89
0039-3223
Pojawia się w:
Studia Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Normal structure of Lorentz-Orlicz spaces
Autorzy:
Lin, Pei-Kee
Sun, Huiying
Powiązania:
https://bibliotekanauki.pl/articles/1294667.pdf
Data publikacji:
1997
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
Lorentz-Orlicz space
normal sturcture
order continuous
Young function
Opis:
Let ϕ: ℝ → ℝ₊ ∪ {0} be an even convex continuous function with ϕ(0) = 0 and ϕ(u) > 0 for all u > 0 and let w be a weight function. u₀ and v₀ are defined by u₀ = sup{u: ϕ is linear on (0,u)}, v₀=sup{v: w is constant on (0,v)}
(where sup∅ = 0). We prove the following theorem. Theorem. Suppose that $Λ_{ϕ,w}(0,∞)$ (respectively, $Λ_{ϕ,w}(0,1)$) is an order continuous Lorentz-Orlicz space. (1) $Λ_{ϕ,w}$ has normal structure if and only if u₀ = 0 (respectively, $∫_^{v₀} ϕ(u₀) · w < 2 and u₀ <∞). (2) $Λ_{ϕ,w}$ has weakly normal structure if and only if $∫_0^{v₀} ϕ(u₀)· w < 2$.
Źródło:
Annales Polonici Mathematici; 1997, 67, 2; 147-168
0066-2216
Pojawia się w:
Annales Polonici Mathematici
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetohydrodynamic Calculation on Double-Loop Channel Induction Tundish
Autorzy:
Yue, Q.
Pei, X.
Zhang, C.
Wang, X.
Powiązania:
https://bibliotekanauki.pl/articles/350969.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
induction heating
electromagnetic field
channel
tundish
Opis:
A mathematical model is developed to investigate the electromagnetic induction heating in a continuous casting tundish with the double-loop inductor. Maxwell’s equations are solved using finite element method to obtain the magnetic flux density, electromagnetic force, and Joule heating. Results show that the induced current through the two channels generates a current loop. The electromagnetic force points to the center of the channel, thus generating a pinch effect on the molten steel. With the skin effect and proximity effect, Joule heating rate reaches its maximum and minimum values at the corners and the center of the crosssection area respectively. Power ampere-turn has a significant influence on the electromagnetic force and Joule heating density. As ampere-turns vary from 3.6×104 to 2.16×105, Joule heating rate increases from 2.4 MW m-3 to 85 MW m-3. Electromagnetic force also increases from 8×104 N m-3 to 3×106 N m-3 in the center axis line of the channel. The present work reveals the relationship between magnetic flux density and electromagnetic force. The results will be helpful in adjusting the electromagnetic field in channel-induction furnaces and modifying the design of channel parameters.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 1; 329-336
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research on visible light indoor positioning algorithm based on fire safety
Autorzy:
Li, Mao
Jiang, Feng
Pei, Cong
Powiązania:
https://bibliotekanauki.pl/articles/174338.pdf
Data publikacji:
2020
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
indoor positioning algorithm
camera
indoor positioning system
Opis:
From the perspective of ensuring life safety, combined with the advantages of high-speed time response and energy conservation of white light emitting diodes (LEDs), the visible light indoor positioning algorithm based on fire safety is proposed in the paper. First, the model is designed which needs three LED lights arranged in a straight line and positioned in the geographically north direction on the top of the model. Then, the proposed algorithm is discussed and analyzed when the camera is located at the center of the model and facing north, when the camera is located at the center of the model and the angle is rotated, and when the camera is located at any position of the model, respectively. It can accurately calculate the current position of the camera, its response speed is fast and the positioning accuracy is high. Furthermore, this paper also verifies the practicability and reliability of the algorithm by designing the visible light indoor positioning system based on fire safety rescue in natural environment and smoke environment. The experimental results show that the positioning error does not exceed 0.70 cm in smoke environment.
Źródło:
Optica Applicata; 2020, 50, 2; 209-222
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analyzing Anti-nuclear Public Opinion in Taiwan after Japan 311 Earthquake
Autorzy:
Shih-yueh, Yang
Pei-jung, Shih
Powiązania:
https://bibliotekanauki.pl/articles/942335.pdf
Data publikacji:
2016
Wydawca:
Szkoła Główna Handlowa w Warszawie
Tematy:
public opinion
nuclear disaster
natural disaster
political manipulation
Opis:
Japan 311 earthquake/tsunami and the following nuclear disaster in Fukushima create a strong anti-nuclear public opinion in Taiwan. Thus, the government was forced to seal Taiwan's fourth nuclear power plant at Dragon Gate, wavering its final decision. Nonetheless, the immediate damage caused by the nuclear disaster is far less than earthquake/tsunami. Why should people be scared by the nuclear disaster rather than the huge destructiveness of earthquake/tsunami? Indeed, the real danger after a nuclear disaster is the long-term health risks caused by radiation, but the health risks of unhealthy diet and lifestyle are actually far greater than those from radiation. Since people can accept unhealthy diet and lifestyle, why can't they accept nuclear power plant? Moreover, the climax of anti-nuclear public opinion in Taiwan was not reached at the immediate aftermath of 2011 3/11 earthquake/tsunami but three years later in 2014. Why was it? This article addresses all these puzzles and argues that, anti-nuclear public opinion in Taiwan is the product of lack of knowledge and political manipulation. With more information and without political ideology, the anti-nuclear public opinion in Taiwan will be changed. This argument is later confirmed by the internet questionnaire survey of article.
Źródło:
Warsaw Forum of Economic Sociology; 2016, 7, 14; 87-113
2081-9633
Pojawia się w:
Warsaw Forum of Economic Sociology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Progressive collapse test of ship structures in waves
Autorzy:
Pei, Z.
Xu, T.
Wu, W.
Powiązania:
https://bibliotekanauki.pl/articles/260139.pdf
Data publikacji:
2018
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
ship hull girder
progressive collapse behavior
ultimate strength
external force
collapse test
Opis:
The external loads and structural ultimate strength are two important aspects for the safety of ship hull girder. It may collapse in case the structural capacity is less than the external forces in extreme seas. In the present research, progressive collapse test is performed to investigate the collapse mechanism of ship structure in waves. External load with time history and corresponding structural collapse behavior are measured and discussed to demonstrate the interaction of fluid and structures.
Źródło:
Polish Maritime Research; 2018, S 3; 91-98
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Establishment of 5-Fluorouracil-resistant canine mammary tumor cell line
Autorzy:
Zhou, B.
Zhang, D.
Pei, S.M.
Zhang, K.
Du, H.C.
Jin, Y.P.
Lin, D.G.
Powiązania:
https://bibliotekanauki.pl/articles/30283.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Opis:
Canine mammary tumors are the most common neoplasms in intact female dogs. The surgery cannot always solve the problem, chemotherapy are recommend to these patients. However, chemotherapy could always fail because of multidrug resistance (MDR). Through stepwise increasing 5-Fluorouracil (5-FU) concentration in the culture medium, a 5-FU-resistant canine mammary tumor cell line CMT7364/5-FU was established to disclose the molecular mechanism of the drug resistance. Cell morphology, cell sensitivity to drugs, growth curves, expression of proteins, and chemo-sensitivity in vivo were compared between the parental cell line and resistant cell line. As compared it to its parental cell line (CMT7364), CMT7364/5-FU showed different morphology, cross-resistant to other chemo-drugs and a prolonged population doubling time (PDT). The drug efflux pump proteins (ABCB1 and ABCG2) in CMT7364/5-FU were up-regulated. In vivo, the similar result revealed that CMT7364/5-FU cell line was more resistant to 5-FU. In conclusion, a 5-FU-resistant canine mammary tumor cell line (CMT7364/5-FU) was successfully established, it can serve as a good model for researching the mechanism of MDR and screening effective agents to reverse drug resistance.
Źródło:
Polish Journal of Veterinary Sciences; 2017, 20, 1
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sliding mode tracking control for unmanned helicopter using extended disturbance observer
Autorzy:
Ullah, Ihsan
Pei, Hai-Long
Powiązania:
https://bibliotekanauki.pl/articles/229728.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
unmanned helicopter
external disturbances
sliding mode control
extended disturbance observer
mismatched uncertainty
Opis:
This paper presents a robust control technique for small-scale unmanned helicopters to track predefined trajectories (velocities and heading) in the presence of bounded external disturbances. The controller design is based on the linearized state-space model of the helicopter. The multivariable dynamics of the helicopter is divided into two subsystems, longitudinallateral and heading-heave dynamics respectively. There is no strong coupling between these two subsystems and independent controllers are designed for each subsystem. The external disturbances and model mismatch in the longitudinal-lateral subsystem are present in all (matched and mismatched) channels. This model mismatch and external disturbances are estimated as lumped disturbances using extended disturbance observer and an extended disturbance observer based sliding mode controller is designed for it to counter the effect of these disturbances. In the case of heading-heave subsystem, external disturbances and model mismatch only occur in matched channels so a second order sliding mode controller is designed for it as it is insensitive to matched uncertainties. The control performance is successfully tested in Simulink.
Źródło:
Archives of Control Sciences; 2019, 29, 1; 169-199
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study on the Detonation Parameters of Aluminized Explosives Based on a Disequilibrium Multiphase Model
Autorzy:
Pei, H.
Nie, J.
Jiao, Q.
Powiązania:
https://bibliotekanauki.pl/articles/358535.pdf
Data publikacji:
2014
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
nonideal explosives
velocity of detonation
detonation pressure
relaxation timescale
Opis:
Detonation models are usually based on the classical Euler equations of gas dynamics under the assumption of thermodynamic equilibrium. However reported data show the Chapman-Jouguet (CJ) detonation parameters of nonideal explosives based on thermodynamic equilibrium codes are significantly different from experimental results. Based on the conventional CJ model, a new multiphase flow model, not in thermal equilibrium, was considered in this study. This approach was applied to compute the velocity of detonation for several aluminized explosives. The predictions are better than the CJ equilibrium model and are in excellent agreement with experimental data. All of the deviations for the velocity of detonation (VOD) are less than 4%.
Źródło:
Central European Journal of Energetic Materials; 2014, 11, 4; 491-500
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 54

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