Autor: Zhang, Di - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Abruptly autofocusing property of circular Pearcey vortex beams with different initial launch angles in harmonic potentials
Autorzy:: Liu, Xianglian
Zhang, Di
Zhao, Lijiao
Li, Pu
Zhang, Jianguo
Liu, Yi
Powiązania:: https://bibliotekanauki.pl/articles/2172824.pdf
Data publikacji:: 2022
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: autofocusing beam
optical vortices
Pearcey
Opis:: We have studied and explored the influence of different launch angles on the circular Pearcey beams (CPBs) without vortex or with vortex for the first time. Although launch angles can manipulate the focal length and the contrast of peak intensity of the CPBs, the shape and propagation trajectory of the CPBs maintain invariant. When the vortex is considered, the focal pattern and the contrast of peak intensity of the circular Pearcey vortex beams (CPVBs) can be changed by adjusting the magnitude of topological charges and the position of vortex. In addition, we have deliberated the propagation of the CPVBs under the action of double opposite optical vortices.
Źródło:: Optica Applicata; 2022, 52, 3; 417--428
0078-5466
1899-7015
Pojawia się w:: Optica Applicata
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Experimental study on fatigue mechanical properties of sandstone after dry and wet cycle
Autorzy:: Jin-Song, Zhang
Yu, Lu
Heng-Liang, Zhang
Yu-Di, Yang
Yi-Shun, Bu
Powiązania:: https://bibliotekanauki.pl/articles/2174078.pdf
Data publikacji:: 2022
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Opis:: At present, many studies have been carried out on the fatigue mechanical properties of conventional rocks, but there are few studies on the mechanical properties of rocks after water rock interaction. The aim is to better study the fatigue mechanical characteristics of sandstone after dry wet cycle and the research object we take was sandstone samples after a certain number of drying and wetting cycles. The WAW-2000 electro-hydraulic servo pressure system was used to carry out uniaxial fatigue cyclic loading and unloading tests with different amplitudes and different upper limit stresses. The test found that: when the sample is damaged under fatigue load, the stress-strain curve shows a sharp downward trend and a sudden instability failure occurred in the sample.With the increase of the upper limit stress and amplitude, the life of the sample decreases gradually which also conforms to the change of power function. Then the relationship between fatigue life and stress is obtained. The fatigue stress-strain curve is characterized by sparse-dense-sparse. With the increase of cycle time, the axial strain of the sample shows an inverted “S” shape. The strain change can be divided into three stages: initial stage, constant velocity stage and acceleration stage.
Źródło:: Archives of Civil Engineering; 2022, 68, 4; 377--387
1230-2945
Pojawia się w:: Archives of Civil Engineering
Dostawca treści:: Biblioteka Nauki