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    Wyświetlanie 1-14 z 14
    Tytuł:
    Sliding mode methods for fault detection and fault tolerant control with application to aerospace systems
    Autorzy:
    Edwards, C.
    Alwi, H.
    Tan, C. P.
    Powiązania:
    https://bibliotekanauki.pl/articles/331368.pdf
    Data publikacji:
    2012
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    ruch ślizgowy
    sterowanie ślizgowe
    detekcja uszkodzeń
    sterowanie tolerujące uszkodzenia
    sliding modes
    fault detection
    fault tolerant control
    control allocation
    Opis:
    Sliding mode methods have been historically studied because of their strong robustness properties with regard to a certain class of uncertainty, achieved by employing nonlinear control/injection signals to force the system trajectories to attain in finite time a motion along a surface in the state-space. This paper will consider how these ideas can be exploited for fault detection (specifically fault signal estimation) and subsequently fault tolerant control. It will also describe applications of these ideas to aerospace systems, including piloted flight simulator results associated with the GARTEUR AG16 Action Group on Fault Tolerant Control. The results demonstrate a successful real-time implementation of the proposed fault tolerant control scheme on a motion flight simulator configured to represent the post-failure EL-AL aircraft.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2012, 22, 1; 109-124
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Review of Surface Deformation and Strain Measurement Using Two-Dimensional Digital Image Correlation
    Autorzy:
    Khoo, S.-W.
    Karuppanan, S.
    Tan, C.-S.
    Powiązania:
    https://bibliotekanauki.pl/articles/221852.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    surface deformation
    strain measurement
    two-dimensional digital image correlation
    Opis:
    Among the full-field optical measurement methods, the Digital Image Correlation (DIC) is one of the techniques which has been given particular attention. Technically, the DIC technique refers to a non-contact strain measurement method that mathematically compares the grey intensity changes of the images captured at two different states: before and after deformation. The measurement can be performed by numerically calculating the displacement of speckles which are deposited on the top of object’s surface. In this paper, the Two-Dimensional Digital Image Correlation (2D-DIC) is presented and its fundamental concepts are discussed. Next, the development of the 2D-DIC algorithms in the past 33 years is reviewed systematically. The improvement of 2DDIC algorithms is presented with respect to two distinct aspects: their computation efficiency and measurement accuracy. Furthermore, analysis of the 2D-DIC accuracy is included, followed by a review of the DIC applications for two-dimensional measurements.
    Źródło:
    Metrology and Measurement Systems; 2016, 23, 3; 461-480
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of fracture parameters for crack problems in fgm by a meshless method
    Wyznaczanie parametrów pękania dla szczelin w materiałach funkcjonalnie gradientowych metodą bezsiatkową
    Autorzy:
    Sladek, J.
    Sladek, V.
    Zhang, C.
    Tan, C.-L.
    Powiązania:
    https://bibliotekanauki.pl/articles/280798.pdf
    Data publikacji:
    2006
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    parametry pękania
    analiza szczelin
    naprężenia T
    materiały funkcjonalnie gradientowe
    stress intensity factors
    T-stress
    meshless methods
    hermoelasticity
    nonhomogenity
    orthotropic materials
    Opis:
    A meshless method based on the local Petrov-Galerkin approach is proposed for crack analysis in two-dimensional (2D), anisotropic and linear elastic solids with continuously varying material properties. Both quasi-static thermal and transient elastodynamic problems are considered. For time-dependent problems, the Laplace transform technique is utilized. The analyzed domain is divided into small subdomains of circular shapes. A unit step function is used as the test function in the local weak form. It leads to Local Integral Equations (LIE) involving a domain-integral only in the case of transient dynamic problems. The Moving Least Squares (MLS) method is adopted for approximating the physical quantities in the LIE. Efficient numerical methods are presented to compute the fracture parameters, namely, the stress intensity factors and the T-stress, for a crack in Functionally Graded Materials (FGM). The path-independent integral representations for stress intensity factors and T-stresses in continuously non-homogeneous FGM are presented.
    Przedstawiono bezsiatkową metodę analizy szczelin opartą na podejściu Petrova-Galerkina dla dwuwymiarowych liniowo-sprężystych i anizotropowych ośrodków o zmieniających się własnościach materiałowych. Rozważono zarówno kwazistatyczne problemy naprężeń cieplnych, jak i zagadnienia elastodynamiki, w których zastosowano aparat transformacji Laplace'a. Badany obszar podzielono na małe podobszary kołowe. Jako funkcję testową w lokalnej, słabej postaci zastosowano jednostkową funkcję schodkową, co prowadzi do lokalnych równań całkowych (LIE). Metodę ruchomych najmniejszych kwadratów (MLS) zastosowano do przybliżenia wielkości fizycznych w LIE. Przedstawiono efektywne metody numeryczne wyznaczania parametrów pękania, a w szczególności współczynników koncentracji naprężeń oraz naprężeń T dla szczelin w materiałach funkcjonalnie gradientowych (FGM). Przedstawiono niezależne od drogi całkowania reprezentacje tych parametrów w materiałach FGM o kontynualnie zmieniającej się niejednorodności.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2006, 44, 3; 603-636
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Multi-parameter measurement under fiber bending based on directional resonance coupling in photonic crystal fibers
    Autorzy:
    Tan, C.
    Wang, Q.
    Ding, Y.
    Li, H.-W.
    Wang, M.
    Liu, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/174320.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    fiber bending
    multi-parameter measurement
    photonic crystal fiber
    fiber sensing
    Opis:
    A multi-parameter sensor with enhanced sensitivity based on magnetic fluids infiltrated photonic crystal fiber is proposed. The sensing performances are investigated using the mode coupling theory and finite element method. Four symmetrical defective channels are assembled into the photonic crystal fiber to produce two resonant transmission dips λCV and λCH in vertical and horizontal directions, respectively. Each dip can be split into two relatively shallow dips (λCV1, λCV2 or λCH1, λCH2) when the photonic crystal fiber is bent. Interestingly, the values of (λCH2 – λCH1) and (λCV2 – λCV1) are associated with corresponding bend-curvature but almost unaffected by external temperature or magnetic field. On the contrary, the values of (λCH2 + λCH1)/2 and (λCV2 + λCV1)/2 are sensitive to temperature or magnetic field regardless of the bending condition. Based on above characteristics and the dependence of the magnetic fluids refractive index on temperature and magnetic field, the proposed sensor can measure not only the bend-curvature and bend-direction, but also the temperature and magnetic field.
    Źródło:
    Optica Applicata; 2018, 48, 3; 449-462
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Note on describing function analysis of fractional order nonlinear control systems
    Autorzy:
    Yeroglu, C.
    Tan, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/206045.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Instytut Badań Systemowych PAN
    Tematy:
    describing function
    fractional order control
    limit cycle
    nonlinear systems
    relay auto-tuning
    stability margin
    Opis:
    This paper presents extensions of some results, obtained for the analysis of classical nonlinear control systems, to the nonlinear fractional order systems. It is shown that the results related to limit cycle prediction using describing function method can be applied to the fractional order plants. The frequency and the amplitude of the limit cycle are used for auto-tuning of the PID controller for nonlinear control systems with fractional order transfer functions. Fractional order control system with parametric uncertainty is also considered for the nonlinear case. On the other hand, a New method is provided for stability margin computation for fractional order nonlinear control system with parametric uncertainty structure using the Nyquist envelopes of the fractional order uncertain plant and the describing function that represents the nonlinearity of the system. Maximum perturbation bounds of the parameters of the fractional order plant are computed. Numerical examples are included to illustrate the methods presented.
    Źródło:
    Control and Cybernetics; 2015, 44, 2; 233-255
    0324-8569
    Pojawia się w:
    Control and Cybernetics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Near-field multiple optical trapping using high order axially symmetric polarized beams
    Autorzy:
    Zhou, Z
    Tan, Q
    Zhu, L
    Yang, C
    Powiązania:
    https://bibliotekanauki.pl/articles/174886.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    optical trapping
    surface plasmon polaritons
    axially symmetric polarized beams
    Opis:
    The near-field multiple optical trapping using high order axially symmetric polarized beams (ASPBs) is studied for the first time. First, a near-field optical trapping scheme is proposed based on the Kretschmann–Raether configuration, and surface plasmon polaritons (SPPs) field distributions excited by incident ASPBs are calculated, which present a multi-focal-spot pattern and the size of spots is much smaller than that of the diffraction limitation. Then, the gradient forces on Rayleigh dielectric particles formed by the multi-focal-spot focused field are computed, which indicates that multiple ultra-small particles with the refractive index higher than that of the ambient medium can be trapped simultaneously on the metal surface. The number and size of trapped particles can be manipulated by flexibly modifying the polarization order of incident beams, which is expected to enhance the capability of traditional optical trapping systems and provide a solution for massively parallel optical trapping of nanometer-sized particles.
    Źródło:
    Optica Applicata; 2013, 43, 2; s. 287-296
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Lifetime prediction method for electron multiplier based on accelerated degradation test
    Metoda prognozowania cyklu życia powielacza elektronów oparta na przyspieszonych badaniach degradacji
    Autorzy:
    Wang, Y.
    Zhang, C.
    Chen, X.
    Tan, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/301960.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
    Tematy:
    electron multiplier
    accelerated degradation test
    lifetime prediction
    reliability
    powielacz elektronów
    przyspieszone badanie degradacji
    prognozowanie cyklu życia
    niezawodność
    Opis:
    Electron multiplier (EM) is a kind of highly reliable and long-lifetime vacuum electronic device applied widely in spectrometry, space exploration and atom frequency standard. It is a critical device which might constrain the related technology. A challenge remains for researcher and engineer how to predict the life span of EM. Firstly, degradation mechanism of EM is investigated. It shows that the secondary emission ratios of each multiplier electrode reduces gradually with operating time, which results in the degradation of the key performance index of EM, i.e. the gain of electric current. So an accelerated degradation test (ADT) methodology using dual stresses is proposed to predict the life span of EM. Secondly, the ADT plan with dual stresses is designed and carried out by the corresponding test system established. Finally, the data analysis procedure is presented, and its validity is investigated by model verification. The presented method can sharply reduce testing time and cost because of using accelerated stress which can accelerate degradation process of EM. This method can also provide a new way to lifetime and reliability prediction for other products with long lifetime and high reliability.
    Powielacz elektronów (EM) to elektroniczne urządzenie próżniowe o wysokiej niezawodności i długim cyklu życia, które znajduje szerokie zastosowanie w spektrometrii i badaniach przestrzeni kosmicznej, a także w atomowych wzorcach częstotliwości. Jest to urządzenie krytyczne, które może stanowić ograniczenie dla technologii, w której jest wykorzystywane. Wyzwaniem dla naukowców i inżynierów pozostaje pytanie, jak przewidzieć żywotność EM. W pierwszej kolejności w artykule zbadano mechanizm degradacji EM. Badanie pokazało, że współczynniki emisji wtórnej elektrody powielacza maleją stopniowo wraz z upływem czasu pracy, co prowadzi do degradacji kluczowego wskaźnika wydajności EM, to znaczy wzmocnienia prądu elektrycznego. W oparciu o ten fakt, zaproponowano metodę prognozowania żywotności EM zasadzającą się na metodologii przyspieszonych badań degradacji (ADT) z wykorzystaniem podwójnych naprężeń. Następnie zaprojektowano i zrealizowano plan ADT z podwójnymi naprężeniami za pomocą odpowiedniego systemu testowego. Na koniec przedstawiono procedurę analizy danych, a ich wiarygodność zbadano poprzez weryfikację modelu. Przedstawiona metoda może znacznie zredukować czas i koszty badań dzięki wykorzystaniu przyspieszonych naprężeń, które mogą przyspieszyć proces degradacji EM. Metoda ta może również umożliwić nowy sposób przewidywania niezawodności i cyklu życia produktów o długim cyklu życia i wysokiej niezawodności.
    Źródło:
    Eksploatacja i Niezawodność; 2014, 16, 3; 484-490
    1507-2711
    Pojawia się w:
    Eksploatacja i Niezawodność
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fabrication and Characterization of PMMA/HMX-based Microcapsules via in situ Polymerization
    Autorzy:
    Jia, X.
    Hou, C.
    Tan, Y.
    Wang, J.
    Ye, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/358134.pdf
    Data publikacji:
    2017
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    fabrication
    characterization
    HMX
    PMMA
    microcapsules
    Opis:
    Microcapsule technology was applied with nitramine explosives to improve their performance. Polymethyl Methacrylate (PMMA) was selected for the fabrication of 1,3,5,7-tetranitro-1,3,5,7-tetrazocane (HMX) based microcapsules. The PMMA/HMX-based microcapsules were prepared via a facile in situ polymerization of PMMA on the surface of the HMX crystals. Structural characterization of the PMMA/HMX microcapsules was studied systematically by scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier-transform infrared (FT-IR) spectroscopy, and their thermal durability as well as their mechanical sensitivities were measured. The results indicated that spherical microcapsules were formed, with PMMA as the capsule wall and HMX as the core material. The SEM results showed that the grains of the PMMA/HMX microcapsules were spherical and that the particle distribution was homogeneous. XRD and FT-IR analyses indicated that the HMX polymorph was preserved in the optimal β-form during the whole preparative process. The DSC results showed that the PMMA/HMX microcapsules had better thermal decomposition performance, and that the apparent activation energy of the microcapsules had increased by 47.3 kJ/mol compared to the recrystallized HMX, and its thermal stability had greatly improved. In addition, the drop height (H50) had increased from 30.45 cm to 58.49 cm, an increase of 65.81%. Thus, microcapsule technology will have a very wide range of applications in reducing the sensitivity of high energy materials in the future.
    Źródło:
    Central European Journal of Energetic Materials; 2017, 14, 3; 559-572
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    AE test of calcareous sands with particle rushing
    Autorzy:
    Tan, F.
    Wang, X.
    Hu, M.
    Wang, R.
    Zhu, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/259886.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    calcareous sands
    accoustic emission
    conventional triaxial
    consolidated undrained
    AE signal
    particle crushing
    Opis:
    The particle of calcareous sands was forced to crush, then the energy from the crushing was released by the form of sound waves. Therefore the AE technique was used to detect the calcareous sands AE signal when it crushed. by to study the AE characteristics, the mechanics of calcareous sands was studied. Study showed that: (1) there was the AE activities on the low confining pressure condition at the beginnig of test, (2) there was more and more AE activities with the continuing of test until to the end, (3) the calcareous sands’ AE activities was on the whole testing, (4) the calcareous sands’ particle crushing and mutual friction played different roles for its AE activities. Then the AE model based on the calcarous sands’ particle crushing was discussed.
    Źródło:
    Polish Maritime Research; 2017, S 2; 118-124
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A planning model for the chemical integrated system under uncertainty by grey programming approach
    Autorzy:
    Ren, J.
    Tan, S.
    Dong, L.
    Zhou, Z.
    Gao, S.
    Pan, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/778898.pdf
    Data publikacji:
    2013
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    planning
    chemical integrated system
    grey programming
    Opis:
    A model to optimize the planning of the chemical integrated system comprised by multi-devices and multi-products has been proposed in this paper. With the objective to make more profits, the traditional model for optimizing production planning has been proposed. The price of chemicals, the market demand, and the production capacity have been considered as mutative variables, then an improved model in which some parameters are not constant has been developed and a new method to solve the grey linear programming has been proposed. In the grey programming model, the value of credibility can be suggested by the decision-makers, and the results of the production planning calculated by the model can help them to achieve their desired target. An actual case has been studied by the proposed methodology, and the proposed methodology can be popularized to other cases.
    Źródło:
    Polish Journal of Chemical Technology; 2013, 15, 2; 16-22
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Theoretical Predictions of Lattice Parameters and Mechanical Properties of Pentaerythritol Tetranitrate under the Temperature and Pressure by Molecular Dynamics Simulations
    Autorzy:
    Tan, J.J.
    Hu, C.
    Li, Y.
    Ge, N.
    Chen, T.
    Ji, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/1033453.pdf
    Data publikacji:
    2017-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    molecular dynamics
    lattice parameter
    equation of state
    elasticity
    mechanical properties
    Opis:
    Molecular dynamics simulations with condensed-phase optimized molecular potentials for atomistic simulation studies force field are performed to investigate the structure, equation of state, and mechanical properties of high energetic material pentaerythritol tetranitrate. The equilibrium structural parameters, pressure-volume relationship and elastic constants at ambient conditions agree excellently with experiments. In addition, fitting the pressure-volume data to the Birch-Murnaghan or Murnaghan equation of state, the bulk modulus B₀ and its first pressure derivative B'₀ are obtained. Moreover, the elastic constants are calculated in the pressure range of 0-10 GPa at room temperature and in the temperature range of 200-400 K at the standard pressure, respectively. By the Voigt-Reuss-Hill approximation, the mechanical properties such as bulk modulus B, shear modulus G, and the Young modulus E are also obtained successfully. The predicted physical properties under temperature and pressure can provide powerful guidelines for the engineering application and further experimental investigations.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 2; 318-323
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Osteology of the Late Cretaceous alvarezsauroid Linhenykus monodactylus from China and comments on alvarezsauroid biogeography
    Autorzy:
    Xu, X.
    Upchurch, P.
    Ma, Q.
    Pittman, M.
    Choiniere, J.
    Sullivan, C.
    Hone, D.W.E.
    Tan, Q.
    Tan, L.
    Xiao, D.
    Han, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/20629.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    osteology
    Cretaceous
    Late Cretaceous
    alvarezsauroid
    Linhenykus monodactylus
    China
    biogeography
    Dinosauria
    Theropoda
    Parvicursorinae
    Treefitte
    dispersal
    vicariance
    sympatry
    Wulansuhai Formation
    Inner Mongolia
    Opis:
    The alvarezsauroid theropod Linhenykus monodactylus from the Upper Cretaceous of Inner Mongolia, China is the first knownmonodactyl non−avian dinosaur, providing important information on the complex patterns of manual evolution seen in alvarezsauroids. Herewe provide a detailed description of the osteology of this taxon. Linhenykus shows a number of fea− tures that are transitional between parvicursorine and non−parvicursorine alvarezsauroids, but detailed comparisons also re− veal that some characters had a more complex distribution. We also use event−based tree−fitting to perform a quantitative analysis of alvarezsauroid biogeography incorporating several recently discovered taxa. The results suggest that there is no statistical support for previous biogeographic hypotheses that favour pure vicariance or pure dispersal scenarios as explana− tions for the distributions of alvarezsauroids across SouthAmerica, NorthAmerica andAsia. Instead, statistically significant biogeographic reconstructions suggest a dominant role for sympatric (or “within area”) events, combined with a mix of vicariance, dispersal and regional extinction. At present the alvarezsauroid data set is too small to completely resolve the biogeographic history of this group: future studies will need to create larger data sets that encompass additional clades.
    Źródło:
    Acta Palaeontologica Polonica; 2013, 58, 1
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ultrafast Carrier Trapping and High Resistivity of MeV Energy Ion Implanted GaAs
    Autorzy:
    Korona, K. P.
    Jasiński, J.
    Kurpiewski, A.
    Kamińska, M.
    Jagadish, C.
    Tan, H. H.
    Krotkus, A.
    Marcinkevicius, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1951117.pdf
    Data publikacji:
    1996-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.72.Vv
    72.20.Jv
    72.80.Ey
    Opis:
    Semi-insulating GaAs wafers were implanted with MeV As, Ga, O or Si ions at doses ranging from 1×10$\text{}^{14}$ to 5×10$\text{}^{16}$ cm$\text{}^{-2}$. Their structural properties were studied by electron microscopy and the Rutherford backscattering-channeling. Time resolved photoluminescence, electrical conductivity and the Hall effect were used to determine carrier lifetime and electrical properties of the material. Annealing of the samples at 600°C led to the recovery of transport in conduction band. The As, Ga and O implanted samples became semi-insulating, while the Si implanted samples were n-type. Carrier trapping times were short, shorter than 1 ps for the highest dose used. Models explaining the fast photocarrier decay are discussed.
    Źródło:
    Acta Physica Polonica A; 1996, 90, 4; 851-854
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Role of Arsenic Antisite Defect in Nonstoichiometric Gallium Arsenide
    Autorzy:
    Jasiński, J.
    Kurpiewski, A.
    Korοna, K.
    Kamińska, M.
    Ρalczewska, M.
    Krotkus, A.
    Marcinkievicius, S.
    Liliental-Weber, Z.
    Tan, H. H.
    Jagadish, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/1933772.pdf
    Data publikacji:
    1995-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.30.Er
    73.90.+f
    Opis:
    Over the last few years there have been many studies of GaAs layers grown at low temperatures (180-300°C), so called LT GaAs. The interest in LT GaAs was motivated by the potential application of 600oC annealed LT GaAs in microwave and fast optoelectronic devices because of its short photocarrier lifetime, reasonable mobility and high resistivity. These properties are associated with the nonstoichiometry of LT GaAs. Recently, studies of comparable material, nonstoichiometric GaAs produced by arsenic ion implantation have been initiated. There is still a strong controversy as to whether the arsenic antisite (As$\text{}_{Ga}$) or arsenic precipitates are responsible for unique electrical properties of both materials. This paper presents the results of structural and electrical studies of high energy As implanted GaAs and comments on relationships between the structure and the resulting electrical properties.
    Źródło:
    Acta Physica Polonica A; 1995, 88, 4; 747-750
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-14 z 14

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