Autor: Chen, A. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Finite-difference time-domain solution of second-order photoacoustic wave equation
Autorzy:: Rahimzadeh, A.
Chen, S.-L.
Powiązania:: https://bibliotekanauki.pl/articles/173969.pdf
Data publikacji:: 2016
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: photoacoustic tomography
numerical simulation
finite-difference time-domain
second-order photoacoustic equation
Opis:: A finite-difference time-domain numerical solution is presented for solving a single second-order photoacoustic equation, instead of solving three coupled first-order equations. In this way, we are able to insert the heating function to the simulation directly instead of initial pressure. Results are validated using k-Wave simulation and show a good agreement for future development. The perfectly matched layer boundary condition has been implemented for a second-order photoacoustic equation and results are compared to Dirichlet, Neumann and Mur boundary conditions.
Źródło:: Optica Applicata; 2016, 46, 3; 435-446
0078-5466
1899-7015
Pojawia się w:: Optica Applicata
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 2.

Tytuł:: Improved Roberts focusing evaluation method for an autofocusing system
Autorzy:: Yin, A.
Dai, Z.
Chen, B.
Li, K.
Powiązania:: https://bibliotekanauki.pl/articles/173381.pdf
Data publikacji:: 2013
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: focus evaluation function
evaluation window
autofocusing
Opis:: In this paper, a new focusing evaluation method based on local 2/8 center windows is proposed for an autofocusing system. We have proposed an evaluation function which improved the Roberts function with eight-neighborhood or four-neighborhood. The approximate optimal criteria window is selected by a 2/8 rule. Comparative experiments implemented with other methods have shown that the 2/8 rule method not only can find the approximate optimal evaluation window quickly, but also has better generality. This evaluation function of improved Roberts’ function has higher sensitivity and better real-time performance.
Źródło:: Optica Applicata; 2013, 43, 3; 529-538
0078-5466
1899-7015
Pojawia się w:: Optica Applicata
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 3.

Tytuł:: Surfactant assisted removal of engine oil from synthetic soil
Autorzy:: Ramamurthy, A. S.
Chen, Z.
Li, X.
Azmal, M.
Powiązania:: https://bibliotekanauki.pl/articles/207953.pdf
Data publikacji:: 2015
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: sodium dodecyl sulfate
SDS
desorption
polyethylene oxides
sodium
sodium sulfate
soils
surface active agents
dodecylosiarczan sodu
surfaktanty anionowe
desorpcja
tlenki polietylenu
sód
siarczan sodowy
gleba
środki powierzchniowo czynne
detergenty
Opis:: Effectiveness of surfactants SDS (sodium dodecyl sulfate), AOT (sodium dioctyl sulfosuccinate) and Brij 35 (polyoxyethylene lauryl ether) in removing residual oil from soils have been determined. Experimental results indicated that oil desorption efficiencies with surfactants are 7 to 18 times higher than using water alone. 0.6% Brij 35 at was the most effective surfactant to remove oil from soil, and it did not display any significant change in oil desorption with pH changes. A comparison study also showed that pore volume was a more significant parameter than soil washing flow rate to improve oil desorption.
Źródło:: Environment Protection Engineering; 2015, 41, 2; 67-79
0324-8828
Pojawia się w:: Environment Protection Engineering
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 4.

Tytuł:: Image compression-encryption algorithm combining compressive sensing with log operation
Autorzy:: Chen, R.-L.
Zhou, Y.
Luo, M.
Zhang, A.-D.
Gong, L.-H.
Powiązania:: https://bibliotekanauki.pl/articles/174009.pdf
Data publikacji:: 2018
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: image encryption
image compression
compressive sensing
log operation
Opis:: Based on compressive sensing and log operation, a new image compression-encryption algorithm is proposed, which accomplishes encryption and compression simultaneously. The proposed image compression-encryption algorithm takes advantage of not only the physical realizability of partial Hadamard matrix, but also the resistance of the chosen-plaintext attack since all the elements in the partial Hadamard matrix are 1, –1 or log 1 = 0. The proposed algorithm is sensitive to the key and it can resist various common attacks. The simulation results verify the validity and reliability of the proposed image compression-encryption algorithm.
Źródło:: Optica Applicata; 2018, 48, 4; 563-573
0078-5466
1899-7015
Pojawia się w:: Optica Applicata
Dostawca treści:: Biblioteka Nauki

Artykuł

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