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Wyświetlanie 1-10 z 46
Tytuł:
Robust H∞ control for a class of uncertain neutral systems with both state and control input time-varying delays via a unified LMI optimization approach
Autorzy:
Chen, J. D.
Yang, C. D.
Lin, K. J.
Lien, C. H.
Tematy:
robust H[infinity] control
neutral systems
unified LMI approach
convex optimization approach
delay-dependent criterion
Pokaż więcej
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Powiązania:
https://bibliotekanauki.pl/articles/970609.pdf  Link otwiera się w nowym oknie
Opis:
The robust H∞ control problem is considered for a class of uncertain neutral system involving both state and control input time-varying delays. The uncertainties under consideration are nonlinear time-varying parameter perturbations. The methodology is based on the Lyapunov functional combined with a unified LMI approach, and a new delay-dependent criterion is proposed to guarantee the stabilization and disturbance attenuation of systems. Moreover, a convex optimization approach is used to solve the robust H∞ control disturbance attenuation problem. Finally, a numerical example is illustrated to show the validity of this paper. The simulation results reveal significant improvement over the recent results.
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.
Tematy:
Metal Matrix Composite (MMC)
hot compression
AA6061
B₄C
dislocation
Pokaż więcej
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Powiązania:
https://bibliotekanauki.pl/articles/280433.pdf  Link otwiera się w nowym oknie
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.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wavelength-adjustable all-optical wavelength conversion using a tunable fiber laser and an electroabsorption modulator
Autorzy:
Tseng, C.-L.
Lin, Y.-W.
Ching, P.-J.
Cheng, Y.-T.
Jou, J.-J.
Liu, C.-K.
Tematy:
wavelength conversion
fiber ring laser
erbium-doped fiber
electroabsorption modulator
wavelength division multiplexing (WDM) network
Pokaż więcej
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:
https://bibliotekanauki.pl/articles/174311.pdf  Link otwiera się w nowym oknie
Opis:
A wavelength conversion scheme is presented experimentally using a wavelength tunable erbium-doped fiber laser as a probe light source and an electroabsorption modulator with a DC bias only.For the input wavelength of 1557nm with a 10-Gb/s non-return to zero signal, the Q value is 10.6and the power penalty is less than 1.5dB at a bit error rate of 10–9 at the probe wavelength of1560nm. Given a fixed Q value of 6, probe wavelengths cover a range of 25nm. Furthermore,the relationship between the range of probe wavelength and the amount of power penalty is alsoinvestigated.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Hot Implantation on Residual Radiation Damage in Silicon Carbide
Autorzy:
Rawski, M.
Żuk, J.
Kulik, M.
Droździel, A.
Lin, L.
Prucnal, S.
Pyszniak, K.
Turek, M.
Tematy:
61.72.U-
78.30.-j
61.05.Np
63.50.-x
79.20.Rf
81.70.Fy
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Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:
https://bibliotekanauki.pl/articles/1504145.pdf  Link otwiera się w nowym oknie
Opis:
Remarkable thermomechanical and electrical properties of silicon carbide (SiC) make this material very attractive for high-temperature, high-power, and high-frequency applications. Because of very low values of diffusion coefficient of most impurities in SiC, ion implantation is the best method to selectively introduce dopants over well-defined depths in SiC. Aluminium is commonly used for creating p-type regions in SiC. However, post-implantation radiation damage, which strongly deteriorates required electric properties of the implanted layers, is difficult to anneal even at high temperatures because of remaining residual damage. Therefore implantation at elevated target temperatures (hot implantation) is nowadays an accepted method to decrease the level of the residual radiation damage by avoiding ion beam-induced amorphization. The main objective of this study is to compare the results of the Rutherford backscattering spectroscopy with channeling and micro-Raman spectroscopy investigations of room temperature and 500°C $Al^{+}$ ion implantation-induced damage in 6H-SiC and its removal by high temperature (up to 1600°C) thermal annealing.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Argon Plasma in a New Process for Improving the Physical and Anti-bacterial Properties of Crosslinked Cotton Cellulose with Dimethyloldihydroxyethyleneurea-Maleic Acid
Zastosowanie plazmy niskotemperaturowej w środowisku argonu w procesie obróbki tkanin bawełnianych sieciowanych za pomocą kwasu dimetylodihydroxyetylenourylomaleinowego dla polepszenia właściwosci fizycznych oraz antybakteryjnych
Autorzy:
Tsou, C H
Suen, M C
Tsou, C Y
Chen, J C
Yeh, J T
Lin, S M
Lai, Y C
Hwang, J Z
Huang, S H
Hung, W S
Hu, C C
Lee, K R
Lai, J Y
Tematy:
cotton
plasma
antibacterial
crosslinking
crosslink length
crosslinks number per anhydroglucose
surface distribution
odour absorption
bawełna
plazma
właściwości antybakteryjne
sieciowanie tkanin bawełnianych
kwas dimetylodihydroxyetylenourylomaleinowy
odporności na zagniecenia
pochłanianie zapachów
żywica termoutwardzalna
Pokaż więcej
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
Powiązania:
https://bibliotekanauki.pl/articles/232331.pdf  Link otwiera się w nowym oknie
Opis:
This study reports the findings of an argon (Ar) plasma treatment added to the traditional pad-dry-cure process between dry and cure treatments. This new process is called the "paddry-plasma-cure process". The crosslinking agent was a mixture of dimethyloldihydroxyethyleneurea (DMDHEU) and maleic acid (MA). Results show that Ar plasma treatment can increase the bonded crosslinking agent (i.e., the nitrogen content). The dry crease recovery angle (DCRA), wet crease recovery angle (WCRA), and tensile strength retention (TSR) of the pad-dry-plasma-cure finished fabrics were higher than those of traditional pad-dry-cure finished fabrics at a given nitrogen content. Additionally it was found that the number of crosslinks per anhydroglucose unit (CL/AGU) and the length of crosslinks of pad-dry-plasma-cure-finished fabrics were higher than that of traditional pad-dry-cure finished fabrics at the same resin concentration in the pad bath. DCRA, WCRA and TSR values of pad-dry-plasma-cure-finished fabrics were higher than those of pad-dry-curefinished fabrics at the same CL/AGU value. However, activation energies for the pad-dryplasma-cure process were higher than those for the pad-dry-cure process. The anti-bacterial ability and odour absorption of the pad-dry-plasma-cure and pad-dry-plasma-cure finished fabrics were higher than those for the pad-dry-cure finished fabrics. The surface distribution of crosslinking agents for the pad-dry-plasma-cure process was higher than that of the pad-dry-cure process. Thus the pad-dry-plasma-cure process is excellent for improving the physical properties, bacterial inhibition, and odour absorption of finished cotton fabrics and for decreasing their formaldehyde release.
Artykułu odnosi się do problematyki możliwości i celowości wprowadzenia modyfikacji plazmowej w warunkach niskociśnieniowych i w środowisku argonu do konwencjonalnego procesu wykończenia przeciw mnącego z zastosowaniem reaktywnych żywic termoutwardzalnych. Badano kąt odprężenia na sucho i na mokro, i stwierdzono polepszenie właściwości odporności na zagniecenia w wyniku dodatkowego zastosowania plazmy. Badano również właściwości antybakteryjne i pochłanianie zapachów, które okazały się korzystniejsze dla dodatkowej obróbki plazmowej. W wyniku zmodyfikowanej obróbki uzyskano mniejsze wydzielanie formaldehydu z gotowej tkaniny.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Snowmass 2021 whitepaper : proton structure at the precision frontier
Autorzy:
Candido, A.
Moch, S.
Amoroso, S.
Siódmok, Andrzej
Britzger, D.
Ubiali, M.
Hoeche, S.
Weber, J. H.
Huston, J.
Giuli, F.
Hentschinski, M.
Boughezal, R.
Lin, H.-W.
Hekhorn, F.
Malaescu, B.
Mistlberger, B.
Harland-Lang, L. A.
Jadach, S.
Carrazza, S.
Apyan, A.
Rabbertz, K.
Ball, R. D.
Klein, M.
Schnell, G.
Xie, K.
Buckley, A.
Huss, A.
Bissolotti, C.
Petriello, F.
Pires, J.
Thorne, R. S.
Hobbs, T. J.
Courtoy, A.
Whitehead, James
Nocera, E. R.
Cridge, T.
Sutton, M.
Chachamis, G.
Rojo, J.
Schwan, C.
Blümlein, J.
Guzzi, M. G.
Jalilian-Marian, J.
Loizides, C.
Royon, C.
Yuan, C. -P.
Soper, D. E.
Olness, F. I.
Cooper-Sarkar, A. M.
Gwenlan, C.
Vita, G.
Bozzi, G.
Zhou, B.
Armesto, N.
Cruz-Martinez, J. M.
Bertone, V.
Cerci, S.
Krintiras, G. K.
Magni, G.
Celiberto, F. G.
Nadolsky, P. M.
Opis:
An overwhelming number of theoretical predictions for hadron colliders require parton distribution functions (PDFs), which are an important ingredient of theory infrastructure for the next generation of high-energy experiments. This whitepaper summarizes the status and future prospects for determination of high-precision PDFs applicable in a wide range of energies and experiments, in particular in precision tests of the Standard Model and in new physics searches at the high-luminosity Large Hadron Collider and Electron–Ion Collider. We discuss the envisioned advancements in experimental measurements, QCD theory, global analysis methodology, and computing that are necessary to bring unpolarized PDFs in the nucleon to the N2LO and N3LO accuracy in the QCD coupling strength. Special attention is given to the new tasks that emerge in the era of the precision PDF analysis, such as those focusing on the robust control of systematic factors both in experimental measurements and theoretical computations. Various synergies between experimental and theoretical studies of the hadron structure are explored, including opportunities for studying PDFs for nuclear and meson targets, PDFs with electroweak contributions or dependence on the transverse momentum, for incisive comparisons between phenomenological models for the PDFs and computations on discrete lattice, and for cross-fertilization with machine learning/AI approaches.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Wyświetlanie 1-10 z 46

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