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Wyświetlanie 1-15 z 38
Tytuł:
On the diameter of dot-critical graphs
Autorzy:
Mojdeh, D. A.
Mirzamani, S.
Powiązania:
https://bibliotekanauki.pl/articles/255186.pdf
Data publikacji:
2009
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
dot-critical graph
domination
diameter
Opis:
A graph G is k-dot-critical (totally k-dot-critical) if G is dot-critical (totally dot-critical) and the domination number is k. In the paper [T. Burtona, D. P. Sumner, Domination dot-critical graphs, Discrete Math, 306(2006), 11-18] the following question is posed: What are the best bounds for the diameter of a k-dot-critical graph and a totally k-dot-critical graph G with no critical vertices for k ≥ 4? We find the best bound for the diameter of a k-dot-critical graph, where k ∈ {4, 5, 6} and we give a family of k-dot-critical graphs (with no critical vertices) with sharp diameter 2k - 3 for even k ≥ 4.
Źródło:
Opuscula Mathematica; 2009, 29, 2; 165-175
1232-9274
2300-6919
Pojawia się w:
Opuscula Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spatio-Temporal Dynamics of Carrier Capture Processes: Simulation of Optical Signals
Autorzy:
Lengers, F.
Rosati, R.
Kuhn, T.
Reiter, D.
Powiązania:
https://bibliotekanauki.pl/articles/1033096.pdf
Data publikacji:
2017-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
quantum dot
carrier capture
optical signals
Opis:
We perform simulations of time-resolved optical experiments of carrier-capture processes in a quantum wire-dot system. Scattering of charge carriers with optical phonons of the quantum wire can result in transitions from the continuum states of the quantum wire to discrete states of the quantum dot. We treat the scattering of carriers with optical phonons within a Lindblad single-particle approach. By considering the coupling of carriers to a light field we are able to simulate pump-probe experiments which are shown to be capable of measuring the captured populations. We further discuss the influence of the Coulomb interaction on the obtained spectra.
Źródło:
Acta Physica Polonica A; 2017, 132, 2; 372-375
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optical bistability in double quantum dot molecule with inter-dot tunnelling
Autorzy:
Yu, Chunchao
Sun, Lihui
Zhang, Huafeng
Chen, Fang
Powiązania:
https://bibliotekanauki.pl/articles/174307.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
optical bistability
quantum dot molecule
tunneling
Opis:
We have theoretically studied the optical bistability behaviors under an external electric field and a coupling laser field in double quantum dot molecule system with π-type four energy levels. It can be adjusted by the system parameters such as the electronic cooperation parameter, the tunneling strength, the coupling laser field, the probe and coupling laser detuning. These results may be useful in the experiment and provide new types of all-optical switching.
Źródło:
Optica Applicata; 2019, 49, 2; 293-301
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The connectivity of domination dot-critical graphs with no critical vertices
Autorzy:
Furuya, Michitaka
Powiązania:
https://bibliotekanauki.pl/articles/30148712.pdf
Data publikacji:
2014-11-01
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
dot-critical graph
critical vertex
connectivity
Opis:
An edge of a graph is called dot-critical if its contraction decreases the domination number. A graph is said to be dot-critical if all of its edges are dot-critical. A vertex of a graph is called critical if its deletion decreases the domination number. In A note on the domination dot-critical graphs, Discrete Appl. Math. 157 (2009) 3743-3745, Chen and Shiu constructed for each even integer k ≥ 4 infinitely many k-dot-critical graphs G with no critical vertices and κ(G) = 1. In this paper, we refine their result and construct for integers k ≥ 4 and l ≥ 1 infinitely many k-dot-critical graphs G with no critical vertices, κ(G) = 1 and λ(G) = l. Furthermore, we prove that every 3-dot- critical graph with no critical vertices is 3-connected, and it is best possible.
Źródło:
Discussiones Mathematicae Graph Theory; 2014, 34, 4; 683-690
2083-5892
Pojawia się w:
Discussiones Mathematicae Graph Theory
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Performance of Dot-product preprocessing for Track-Before-Detect tracking of noise objects
Autorzy:
Mazurek, P.
Powiązania:
https://bibliotekanauki.pl/articles/97337.pdf
Data publikacji:
2013
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
tracking
estimation
Track-Before-Detect
dot-product
Opis:
Track-Before-Detect (TBD) algorithms are applied for the tracking of signals below the noise floor. The noise object is the signal that has noise samples only. The processing of such signal using Spatio-Temporal TBD is not possible directly. The preprocessing technique based on the window approach and dot-product calculations emphasis the differences between global and local empirical distributions. The Monte Carlo tests are applied for the analysis of performance for two smoothing coefficients, different width of the window of analysis and different size of the object.
Źródło:
Computer Applications in Electrical Engineering; 2013, 11; 447-454
1508-4248
Pojawia się w:
Computer Applications in Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Output-input properties of incident light on a defect dielectric slab with quantum dot nanostructure
Autorzy:
Jafarzadeh, Hossein
Powiązania:
https://bibliotekanauki.pl/articles/174095.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
quantum dot nanostructure
optical bistability
optical multistability
Opis:
We demonstrate output-input properties of incident light in a defect slab doped by three-level quantum dot nanostructure via quantum coherence and Fano-interference phenomena. Here, we will show that the output-input properties of the system can be adjusted by the Fano-interference strength, amplitude and the relative phase of the driving fields, respectively. Also, we consider the thickness effect of defect medium on controlling the output-input behaviors of probe light. Moreover, we realize that it is possible to switch between optical bistability and optical multistability by optimizing the conditions which are more practical in all-optical switching based nanoscale devices.
Źródło:
Optica Applicata; 2019, 49, 1; 101-113
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Raman spectroscopy of CdTe/ZnTe quantum dot structures
Autorzy:
Zielony, E
Placzek-Popko, E
Kamyczek, P
Henrykowski, A
Karczewski, G
Powiązania:
https://bibliotekanauki.pl/articles/174898.pdf
Data publikacji:
2013
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
Raman spectroscopy
CdTe
ZnTe
quantum dot structures
Opis:
Semiconductor low-dimensional structures of CdTe quantum dots (QDs) embedded in ZnTe matrix have been investigated by micro-Raman spectroscopy. A reference ZnTe sample (without dots) was also studied for comparison. Both samples were grown by a molecular beam epitaxy technique on the p-type GaAs substrate. The Raman measurements have been performed at room temperature. The samples were excited by an Ar2+ laser of 514.5 nm wavelength. The Raman spectra have been recorded for different acquisition parameters of the measurement. For the reference and QD sample localized longitudinal (LO) phonons of 210 cm–1 wavenumber associated with the ZnTe layer are observed. In the case of QD sample another broadband corresponding to the LO CdTe phonon related to the QD-layer appears at a wavenumber of 160 cm–1. Such behaviour does not exhibit the Raman spectra of the reference sample. Thus the Raman measurements confirm the presence of CdTe layer of quantum dots in the investigated material. Additionally, Raman spectra for both samples exhibit tellurium-related peaks at wavenumbers around 120 cm–1 and 140 cm–1, significantly increasing with laser time exposure. It is shown that the peaks are associated with the formation of Te aggregates on the ZnTe surface due to the laser damage in the ZnTe layer.
Źródło:
Optica Applicata; 2013, 43, 1; 181-185
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Antraknoza (Colletotrichum coccodes) nowym zagrożeniem plantacji ziemniaka
Black dot (Colletotrichum coccodes) as a new threat to potato plantation
Autorzy:
Osowski, Jerzy
Powiązania:
https://bibliotekanauki.pl/articles/41523521.pdf
Data publikacji:
2009
Wydawca:
Instytut Hodowli i Aklimatyzacji Roślin
Tematy:
Colletotrichum coccodes
antraknoza
objawy
black dot
symptoms
Opis:
Antraknoza ziemniaka jest chorobą skórki bulw i liści ziemniaka wywoływaną przez grzyba Colletotrichum coccodes (Wallr.) S. J. Hughes (synonimy C. atramentarium (Berk. & Br. Taub) and C. phomoides). Jest chorobą powszechnie występującą w większości rejonów uprawy ziemniaka na świecie i może powodować straty plonu na odmianach podatnych sięgające do 30%–75%. Objawy antraknozy (C. coccodes) mogą występować na wszystkich częściach podziemnych (bulwy potomne, stolony i korzenie), podstawie łodygi i na liściach. Cechą charakterystyczną antraknozy ziemniaka jest występowanie małych czarnych sklerocjów na korzeniach, łodygach, rozłogach i bulwach potomnych zakażonych roślin. Stosunkowo małe znaczenie antraknozy wzrosło po części z powodu rosnącego rynku ziemniaków świeżych i ziemniaków półprzetworzonych wynikającego ze wzrostu popytu na wysokiej jakości ziemniaki myte.
Black dot is a tuber blemish and foliar disease of potato caused by the fungus Colletotrichum coccodes (Wallr.) S. J. Hughes (synonyms C. atramentarium (Berk. & Br. Taub) and C. phomoides). It is common in most potato growing areas in the world and may cause up to 30%–75% yield reduction on susceptible cultivars. Colletotrichum coccodes can colonize all underground parts (daughter tubers, stolons and roots), basal stems and foliage of potato plants. The typical symptoms of the disease are small black sclerotia on the roots, stems, stolons, and progeny tubers of infected plants. The relative importance of Colletotrichum coccodes on potato has increased, in part due to the growing market for fresh, prepacked potatoes, which has resulted in an increase in the demand for washed potatoes with a high-quality appearance.  
Źródło:
Biuletyn Instytutu Hodowli i Aklimatyzacji Roślin; 2009, 251; 243-251
0373-7837
2657-8913
Pojawia się w:
Biuletyn Instytutu Hodowli i Aklimatyzacji Roślin
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Double tunneling induced transparency in the asymmetry quantum dot molecules
Autorzy:
Yu, C.
Huang, H.
Zhang, L.
Xu, D.
Powiązania:
https://bibliotekanauki.pl/articles/173599.pdf
Data publikacji:
2016
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
quantum dot molecule
slow light
tunneling induced transparency
Opis:
Using the density matrix theory, we have studied the double tunneling induced transparency slow light in the double asymmetry quantum dot molecules. With applied electric field, double tunneling induced transparency occur in the same time. Four absorption peaks are found near the resonance energy level in the absorption spectrum and the absorption peak can be tuned by the applied electric field. The velocity and bandwidth of the multiple-windows slow light can also be controlled by the applied electric field. In our model, with Te =0.1meV, we can get about 0.001c and 20GHz bandwidth in each transparency window. Such a property may be applied in all optical buffers, optical switching and filter.
Źródło:
Optica Applicata; 2016, 46, 3; 473-481
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dynamical and Steady State Processes of Probe Absorption-Dispersion in a Four-Level Quantum Dot Nanostructure
Autorzy:
Asadi Amirabadi, E.
Jamshidnejad, M.
Miraboutalebi, S.
Asadpour, S.
Powiązania:
https://bibliotekanauki.pl/articles/1032323.pdf
Data publikacji:
2017-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
quantum dot nanostructure
absorption
dispersion
optical transient processes
Opis:
In this paper, we investigated the transient electron population and the transient behaviour of the dispersion, absorption and refractive property of weak probe light in a four-level InGaN/GaN quantum dot nanostructure. In order to achieve the wave functions and their corresponding energy levels of the mentioned quantum dot nanostructure, the Schrödinger and Poisson equations is solved selfconsistently for carriers (here electron) in quantum dot. Our findings show that the properties of transient processes can be dramatically affected by parameters such as intensity, detuning and relative phase of applied fields. Our proposed scheme provides a realistic model for transient control of refraction index properties in a quantum dot nanostructure. These results may have potential applications in high speed optical switch for quantum information technologies.
Źródło:
Acta Physica Polonica A; 2017, 131, 6; 1460-1465
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Strain distributions in group IV and III-V semiconductor quantum dots
Autorzy:
Wijewardena Gamalath, K. A. I. L.
Fernando, M.A.I.P.
Powiązania:
https://bibliotekanauki.pl/articles/411953.pdf
Data publikacji:
2013
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
quantum dot
strain distribution
hydrostatic strain
biaxial strain
Opis:
A theoretical model was developed using GreenˇŚs function with an anisotropic elastic tensor to study the strain distribution in and around three dimensional semiconductor pyramidal quantum dots formed from group IV and III-V material systems namely, Ge on Si, InAs on GaAs and InP on AlP. A larger positive strain in normal direction which tends to zero beyond 6nm was observed for all three types while the strains parallel to the substrate were negative. For all the three types of quantum dots hydrostatic strain and biaxial strain along x and z directions were not linear but described a curve with a maximum positive value near the base of the quantum dot. The hydrostatic strain in x-direction is mostly confined within the quantum dot and practically goes to zero outside the edges of the quantum dot. For all the three types, the maximum hydrostatic and biaxial strains occur in x-direction around �{1nm and around 2nm in z-direction. The negative strain in x-direction although realtively weak penetrate more deeper to the substrate than hydrostatic strain.The group IV substrate gave larger hydrostatic and biaxial strains than the group III-V semiconductor combinations and InAs /GaAs was the most stable. The results indicated that the movements of atoms due to the lattice mismatch were strong for group III-V.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2013, 2; 36-48
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A numerical solution of the Poisson-Schrodinger problem for a vertical gated quantum dot
Autorzy:
Lis, K.
Bednarek, S.
Adamowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/1964204.pdf
Data publikacji:
2004
Wydawca:
Politechnika Gdańska
Tematy:
semiconductor quantum dot
quantum dots
Poisson-Schrodinger problem
Opis:
We present a numerical solution of the Poisson-Schrodinger problem for a semiconductor nanostructure containing a single quantum dot. The main outcome of our work is the lateral confinement potential, which determines the electronic properties of the nanodevice. We study the real nanodevice with cylindrical symmetry, which allows us to solve the three-dimensional problem on a two-dimensional mesh. We discuss the self-consistency of the solution with respect to the distribution of ionized donors inside the nanodevice.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2004, 8, 4; 603-611
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Goos–Hänchen shift via refractive index control of four-level quantum dot nanostructure
Autorzy:
Jafarzadeh, H.
Powiązania:
https://bibliotekanauki.pl/articles/173281.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
quantum dot nanostructure
Goos–Hänchen shift
negative refractive index
Opis:
In this paper, we will discuss the Goos–Hänchen shifts properties of reflected and transmitted light beams from the cavity with four-level InGaN/GaN quantum dots nanostructure. We find that the Goos–Hänchen shifts properties of reflected and transmitted light beams can be controlled via adjusting the refractive index of four-level quantum dot nanostructure. Here, we show that by tunable infrared laser field the negative refraction index can be possible at certain values of probe frequency. Therefore, the large Goos–Hänchen shifts for reflected and transmitted light beams are possible for negative refractive index condition.
Źródło:
Optica Applicata; 2018, 48, 3; 499-513
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A study on the calibration of an HPM meter based on a D-dot sensor and logarithmic RF power detector
Autorzy:
Jakubowski, Jacek
Powiązania:
https://bibliotekanauki.pl/articles/1849151.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
HPM measurements
sensor calibration
RF detector
D-dot sensor
Opis:
HPM meters are required for the assessment of fields generated by sources of high-power microwaves. Finding the inverse calibration curves for such instruments is important for ensuring accuracy. The procedure is relatively simple for meters consisting of linear devices but there can also be hardware solutions implementing nonlinear ones. The objective of the present work was to develop a convenient procedure to allow finding such a curve when the meter uses a D-dot probe and a power detector. For that purpose, the results of low voltage measurements describing the properties of the detector were first analysed. Then a software code was developed to estimate the RMS value of an incident field based on measured output and frequency response. The response was estimated with very low electric field. And finally, the performance of the proposed procedure was verified by tests conducted with high electric field in a TEM cell. High conformity of the output of the meter with fields of known values was demonstrated. The maximum error related to the meter range did not exceed 4%.
Źródło:
Metrology and Measurement Systems; 2020, 27, 4; 673-685
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Computer simulation of the working cycle of a quantum controlled-NOT gate with two coupled quantum dots
Autorzy:
Moskal, S.
Bednarek, S.
Adamowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/1964205.pdf
Data publikacji:
2004
Wydawca:
Politechnika Gdańska
Tematy:
semiconductor quantum dot
quantum date operation
controlled-NOT (CNOT) gate
Opis:
We discuss a possible realization of a quantum controlled-NOT gate with the use of two coupled quantum dots. Transitions between quantum states of a computational basis are driven by the microwave π-pulse. The parameters of the proposed nanodevice have been optimized in order to make the operation cycle of the gate as short as possible. Numerical solutions of the time-dependent Schrodinger equation allow us to simulate transitions between the quantum states which correspond to the subsequent stages of the gate's operation. The performed time-dependent simulations are a test of realizability of the quantum controlled-NOT gate in the nanodevice.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2004, 8, 4; 591-602
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 38

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