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Wyświetlanie 1-15 z 183
Tytuł:
Genes for resistance to wheat powdery mildew
Autorzy:
Chen, Y
Chelkowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/2043601.pdf
Data publikacji:
1999
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
powdery mildew
chromosomal location
host-pathogen interaction
wheat
resistance gene
Źródło:
Journal of Applied Genetics; 1999, 40, 4; 317-334
1234-1983
Pojawia się w:
Journal of Applied Genetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Performance of transgenic pigs produced with the use of two different growth hormone gene constructs
Autorzy:
Rozycki, M
Smorag, Z.
Kopchick, J.J.
Chen, W.Y.
Jura, J.
Pasieka, J.
Orzechowska, B
Gajda, B.
Skrzyszowska, M.
Powiązania:
https://bibliotekanauki.pl/articles/2043872.pdf
Data publikacji:
1999
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
pig
transgenic pig
gene
performance trait
coding gene
genetic engineering
growth hormone
Źródło:
Journal of Applied Genetics; 1999, 40, 1; 29-37
1234-1983
Pojawia się w:
Journal of Applied Genetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characteristics of humic substances in humid subalpine forest soils in Central Taiwan
Autorzy:
Chen, J S
Chiu, C.Y.
Powiązania:
https://bibliotekanauki.pl/articles/1450325.pdf
Data publikacji:
2001
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
subalpine forest
temperature
humic acid
humification
humic substance
soil
Taiwan
ecosystem
forest soil
terrestrial ecosystem
fulvic acid
Opis:
The study site, 2700 m a.s.l., is located in the central Taiwan. A globally rare combination of the mean temperature (ca. 9.5 °C) and total annual precipitation (ca. 4100 mm) makes studies on pedogenic and edaphic processes of the moist soils in this area worthwhile. The study was undertaken to investigate distribution and characteristics of humic substances in this subalpine forest ecosystem. Fulvic acids comprised a higher total organic carbon fraction (1.8 to 25%) than humic acids (1.1 to 13.4%). Fulvic acids were more mobile and migrated downwards to deeper horizons. Comparatively, humic acids were distributed more in the surface horizons. The hu- mification index, based on E4/E6, showed that humification varied in different horizons even in the same profile. The AlogK and RF values indicate that the types of humic acids extracted from Tsuga forest soil are grouped as P or A types, whereas Rp or B types are in Picea forest soil, suggesting a high degree of humification of humic acids in such soils. Features of the absorption spectra were consistent with the classification of humic acids with A logK and RF values. Humification indices and humic acid types in these subalpine soils indicate that they are similar to acidic soils elsewhere with abundant rainfall and cold climate.
Źródło:
Acta Agrophysica; 2001, 50; 41-47
1234-4125
Pojawia się w:
Acta Agrophysica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Powdery mildew resistance genes in wheat: verification of STS markers
Autorzy:
Stepien, L
Chen, Y.
Chelkowski, J.
Kowalczyk, K.
Powiązania:
https://bibliotekanauki.pl/articles/2048311.pdf
Data publikacji:
2001
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Aegilops speltoides
randomly amplified polymorphic DNA analysis
powdery mildew
wheat
wheat cultivar
Sequence Tagged Site marker
resistance gene
Pm gene
Źródło:
Journal of Applied Genetics; 2001, 42, 4; 413-423
1234-1983
Pojawia się w:
Journal of Applied Genetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Interface Engineering in Heteroepitaxy
Autorzy:
Hong, S. K.
Chen, Y.
Ko, H. J.
Yao, T.
Powiązania:
https://bibliotekanauki.pl/articles/2035571.pdf
Data publikacji:
2002
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.35.-p
68.35.Dv
81.15.-z
81.15.Hi
81.10.Aj
Opis:
We report the importance of interface engineering in heteroepitaxy with examples of plasma-assisted molecular beam epitaxial ZnO growths on (0001) sapphire substrates and on (0001) GaN/sapphire templates, whose interfaces are engineered to improve and to control properties of ZnO films. The growth of rocksalt structure MgO buffer on Al$\text{}_{2}$O$\text{}_{3}$ (0001) is developed for ZnO epitaxy. By employing the MgO buffer layer, the formation of 30$\text{}^{o}$ rotated mixed domains is prohibited and two-dimensional layer-by-layer growth of ZnO on sapphire substrate is achieved. High-resolution X-ray diffraction reveals the superior improvement in a crystal quality of ZnO films with an MgO buffer. Polarity of wurtzite structure ZnO films on Ga-polar GaN/sapphire templates is controlled by changing interface structures. By forming a single crystalline, monoclinic Ga$\text{}_{2}$O$\text{}_{3}$ interfacial layer between GaN and ZnO through O-plasma pre-exposure on the Ga-polar GaN surface, O-polar ZnO films are grown. By forming the ZnO/GaN heterointerface without an interfacial layer through the Zn pre-exposure on the Ga-polar GaN surface, Zn-polar ZnO films are grown.
Źródło:
Acta Physica Polonica A; 2002, 102, 4-5; 541-554
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electron Transport and Microwave Noise in MBE- and MOCVD-Grown AlGaN/AlN/GaN
Autorzy:
Matulionis, A.
Liberis, J.
Eastman, L. F.
Schaff, W. J.
Shealy, J. R.
Chen, X.
Sun, Y. J.
Powiązania:
https://bibliotekanauki.pl/articles/2041771.pdf
Data publikacji:
2005-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
63.20.Kr
72.20.Ht
73.40.Kp
Opis:
Microwave noise temperature, current, and dissipated power were investigated at room temperature in undoped AlGaN/AlN/GaN channels grown by molecular beam epitaxy and metal-organic compound vapour decomposition techniques. Samples with essentially the same electron density (1×10$\text{}^{13}$ cm$\text{}^{-2}$) and low-field mobility (1150 cm$\text{}^{2}$/(V s)) demonstrated considerably different behaviour at high electric fields. The effective hot-phonon lifetime, 300 fs and 1000 fs, respectively, was estimated for molecular beam epitaxy and metal-organic compound vapour decomposition samples. The expected anti-correlation of hot-phonon lifetime and hot-electron drift velocity was confirmed experimentally.
Źródło:
Acta Physica Polonica A; 2005, 107, 2; 361-364
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hybrid stabilization of discrete-time LTI systems with two quantized signals
Autorzy:
Zhai, G.
Matsumoto, Y.
Chen, X.
Imae, J.
Kobayashi, T.
Powiązania:
https://bibliotekanauki.pl/articles/908451.pdf
Data publikacji:
2005
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
system czasu dyskretnego
strategia stabilizacji
kwantyzator
sprzężenie zwrotne
discrete-time LTI system
hybrid stabilization strategy
quantizer
state feedback
output feedback
Opis:
We consider stabilizing a discrete-time LTI (linear time-invariant) system via state feedback where both the quantized state and control input signals are involved. The system under consideration is stabilizable and stabilizing state feedback has been designed without considering quantization, but the system’s stability is not guaranteed due to the quantization effect. For this reason, we propose a hybrid quantized state feedback strategy asymptotically stabilizing the system, where the values of the quantizer parameters are updated at discrete time instants. We also extend the result to the case of static output feedback.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2005, 15, 4; 509-516
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Range Identification for a Perspective Dynamic System with a Single Homogeneous Observation
Autorzy:
Ma, L.
Chen, Y.
Moore, K. L.
Powiązania:
https://bibliotekanauki.pl/articles/908492.pdf
Data publikacji:
2005
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
system identyfikacji
układ dynamiczny
obserwator nieliniowy
range identification
perspective dynamic systems
nonlinear observer
Opis:
Perspective problems arise in machine vision when using a camera to observe the scene. Essential problems include the identification of unknown states and/or unknown parameters from perspective observations. Range identification is used to estimate the states/positions of a moving object with known motion parameters. Range estimation has been discussed in the literature using nonlinear observers with full homogeneous observations derived from the image plane. In this paper, the same range identification problem is discussed with a single homogeneous observation using nonlinear observers. Our simulation results verify the convergence of the observers when their observability conditions are satisfied.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2005, 15, 1; 63-72
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of hadronic rescattering on the elliptic flow after the hydrodynamics model
Autorzy:
Ma, G.
Ma, Y.
Sa, B.
Cai, X.
He, Z.
Huang, H.
Long, J.
Shen, W.
Zhong, Ch.
Chen, J.
Zuo, J.
Zhang, S.
Shi, X.
Powiązania:
https://bibliotekanauki.pl/articles/148372.pdf
Data publikacji:
2006
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
elliptic flow
hydrodynamic model
hadronic rescattering
LUCIAE model
Opis:
Abstract A hydrodynamics + hadronic rescattering model is used to simulate Au+Au collisions at 200 GeV and a Cooper-Frye method is adopted for hadronization. The effect of hadronic rescattering on elliptic flow V2 in 20 40% Au+Au collisions at 200 GeV has been investigated. It is found that the hadronic rescattering can suppress elliptic flow V2 and makes an asymmetric system in momentum space tend to be less anisotropic. The suppression effect becomes weak with increasing transverse momentum. In addition, the effect of hadronic rescattering on transverse momentum spectra and anisotropy of hadronic coordinate space is presented.
Źródło:
Nukleonika; 2006, 51,suppl.3; 21-27
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Early Cambrian origin of thylacocephalan arthropods
Autorzy:
Vannier, J
Chen, J.Y.
Huang, D.Y.
Charbonnier, S.
Wang, X.Q.
Powiązania:
https://bibliotekanauki.pl/articles/23320.pdf
Data publikacji:
2006
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
fauna
thylacocephalan arthropod
Lagerstatte
Zhenghecaris shankouensis
China
arthropod
Arthropoda
Early Cambrian
Cambrian
paleontology
Opis:
Zhenghecaris shankouensis gen. et sp. nov. is one of the largest “bivalved” arthropods of the Lower Cambrian Maotianshan Shale fauna. Its non−mineralized carapace was dome−like, laterally compressed, armed with rostral features, and probably enclosed the entire body of the animal. Zhenghecaris was provided with elliptical stalked lateral eyes. The carapace design, external ornament and visual organs of Zhenghecaris suggest affinities with the Thylacocephala, an extinct (Lower Silurian to Upper Cretaceous) group of enigmatic arthropods whose origins remain poorly understood. The bivalved arthropodsIsoxys and Tuzoia (Lower and Middle Cambrian) are two other potential thylacocephalan candidates making this group of arthropods a possible new component of Cambrian marine communities. Zhenghecaris, Isoxys, and Tuzoia are interpreted as nektonic animals that probably inhabited the lower level of the water column in shallow shelf settings at depths of perhaps 100–150 m or less. Their feeding mode either in the water column (e.g., mesozooplankton) or on the substrate (e.g., small epibenthos, detritus) is uncertain, although some of these arthropods were possibly mid−water predators (e.g., Isoxys with raptorial appendages).
Źródło:
Acta Palaeontologica Polonica; 2006, 51, 2
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An application of feedback linearization to the tracking and almost disturbance decoupling control of nonlinear system with uncertainties
Autorzy:
Chen, C.-C.
Huang, Y.-C
Lin, W.-J.
Shen, D.-C.
Huang, L.-A.
Powiązania:
https://bibliotekanauki.pl/articles/970382.pdf
Data publikacji:
2007
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
almost disturbance decoupling
feedback linearizable
differential geometry approach
composite Lyapunov approach
Opis:
This paper studies the tracking and almost disturbance decoupling problem of nonlinear systems with uncertainties, based on the feedback linearization approach. The main contribution of this study is to construct a controller, under appropriate conditions, such that the resulting closed-loop system is valid for any initial condition and bounded tracking signal with the following characteristics: input-to-state stability with respect to disturbance inputs and almost disturbance decoupling, i.e., the influence of disturbances on the L2 norm of the output tracking error can be arbitrarily attenuated by changing some adjustable parameters. Two examples, which cannot be solved by the first paper on the almost disturbance decoupling problem, are proposed in this paper to exploit the fact that the tracking and the almost disturbance decoupling performances are easily achieved by the proposed approach. In order to demonstrate the practical applicability, the paper has investigated the AMIRA ball and beam system.
Źródło:
Control and Cybernetics; 2007, 36, 2; 385-403
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Tracking and disturbance rejection in a nonlinear control system with time delay
Autorzy:
Chien, T.-L.
Chen, C.-C.
Wu, C.-J.
Huang, Y.-C.
Chen, C.-Y.
Powiązania:
https://bibliotekanauki.pl/articles/969741.pdf
Data publikacji:
2007
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
disturbance rejection
automobile idle-speed control system
differential geometry approach
composite Lyapunov approach
Opis:
We consider the problem of designing a feedback control law in order to reject the unknown bounded disturbance and achieve tracking of reference inputs in control systems described by a class of nonlinear time-delay differential-algebraic equations. Based on the input-output feedback linearization technique and Lya-pimov method for nonlinear state feedback synthesis, a robust globally asymptotical output tracking controller design methodology for nonlinear time-delay control systems with delays on the states and the input is developed. The underlying theoretical approaches are the differential geometry approach and the composite Lyapunov approach. For the view of practical application, the proposed control methodology has been successfully applied to the famous nonlinear automobile idle-speed control system problem.
Źródło:
Control and Cybernetics; 2007, 36, 1; 59-74
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Positron Annilation Lifetime and Glass Transition Temperatures in $CO_2$ Sorption Polystyrene
Autorzy:
Jean, Y.
Chen, H.
Lee, L.
Yang, J.
Powiązania:
https://bibliotekanauki.pl/articles/1812530.pdf
Data publikacji:
2008-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.70.Bj
78.66.Qn
71.60.+z
Opis:
Positron annihilation lifetime spectroscopy was used to measure the free-volume size and distributions as a function of temperature in polystyrene with and without 400 psi $CO_2$ sorption. The transition temperatures in the polystyrene with $CO_2$ sorption obtained from ortho-positronium lifetimes were found to depend on the thermal cycles and a meta-stable state showing a negative thermal expansion coefficient was observed between 53°C and 82°C during the first heating up experiment. The observed $T_g$ in polystyrene with, and without $CO_2$ sorption after annealing from ortho-positronium lifetimes were found to be 86°C and 91°C, which are 5°C higher, and 10°C lower than from the differential scanning calorimetry data, respectively. The observed free-volume variations are discussed in terms of hole expansion, creation, free-volume relaxation, plasticization, and hole filling in amorphous polymers.
Źródło:
Acta Physica Polonica A; 2008, 113, 5; 1385-1395
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Toluene Mono-nitration in a Semi-batch Reactor
Autorzy:
Chen, L. P.
Chen, W. P.
Liu, Y.
Peng, J. H.
Liu, R. H.
Powiązania:
https://bibliotekanauki.pl/articles/358853.pdf
Data publikacji:
2008
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
toluene mono-nitration
apparent activation energy
semi-batch reaction
thermal hazard
Opis:
Toluene mono-nitration in a semi-batch reactor was investigated with reaction calorimeter (RC1). The mixed acid HNO3/H2SO4/H2O (wt%) was used in proportion 13/66/21, which is similar to industrial parameters. The exothermic rates at different reaction temperatures were compared, and then the curves of heat generation rate after dosing were analyzed. The Maximal Temperature attainable by runaway of the desired Synthetic Reaction (MTSR) under different conditions were calculated for the course hazard evaluation. The results showed that the average reaction heat of mono-nitration was between 169.07~177.11 kJ mol-1, and the special heat of reactant was about 2 kJ kg-1 K-1. Average Ea of second order kinetic was about 30 kJ mol-1, and reaction rate was 10-4 mol s-1 l-1 order of magnitude when the strength of sulphuric acid was about 73.5%. It was also found that when temperature or stirring speed increases, the potential heat accumulation decreases.
Źródło:
Central European Journal of Energetic Materials; 2008, 5, 2; 37-47
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 183

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