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Title: Materials Physics and Mechanics.
Organization: Санкт-Петербургский политехнический университет Петра Великого; Российская академия наук
Imprint: Санкт-Петербург: [Изд-во Политехн. ун-та], 2018
Collection: Общая коллекция
File type: PDF
Language: Russian; English
DOI: 10.18720/SPBPU/2/j18-307
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Table of Contents

  • 19_37(2) M.S. Savelyev, P.N. Vasilevsky et. al..pdf
    • *e-mail: savelyev@bms.zone
    • 1. Introduction
    • 3. Experiments and methods for determining the nonlinear optical parameters of samples
    • In the course of the experiments, a nanosecond Nd: YAG laser was used, which generated radiation with a wavelength of 532 nm. The focal length of the lenses was 10 cm. The experimental apparatus used was described in detail in [15]. Based on the measu...
    • Unlike the Z-scan, during the direct nonlinear transmission experiment, the sample was placed in the focus of the lens and did not move during the study. The use of this method makes it possible to determine the linear α and non-linear β absorption co...
    • Dependence of the normalized weakening coefficient on the input energy of the laser beam was found by experiments with a fixed sample location:
    • , (1)
    • where the value of the nonlinear weakening coefficient Knonlin is calculated as
    • . (2)
    • The determination of the sample’s nonlinear optical parameters from the known dependence of the transmitted energy U on the incident U0 is described in detail in [18]. The value of the linear weakening coefficient Klin is determined from the experimen...
    • 4. Results
    • The normalized weakening coefficient was increase with growth of input energy, but in aqueous dispersion of proteins without SWCNTs, this increasing was inconsiderable in comparison with dispersions containing SWCNTs. Fig. 1 shows experimental data, o...
    • The addition of nanotubes to the dispersion leads to a sharp growth of the nonlinear optical effects. The nonlinear absorption coefficient β was 6 cm(GW-1 and 4 cm(GW-1, respectively, for the dispersions of BSA and BC, however, the same dispersions wi...
    • The limiting threshold for BSA and BC dispersions was 0.2 MW/cm2 and 0.3 MW/cm2, and for the same dispersions with SWCNTs, it was 1.8 MW/cm2 and 0.9 MW/cm2, respectively.
    • Knowledge of the values of these parameters allowed calculating theoretical curve of Z-scan with open aperture what made possible to compare with the experimental data (Fig. 2). Thus, the calculations, conducted with the help of the threshold model, ...
    • The graphs show that the addition of SWCNTs to aqueous BSA and BC dispersions leads to a significant increase in the normalized weakening coefficient, i.e. to a sharp increase in absorption of laser radiation by the dispersion.
    • Fig. 1. Dependence of the normalized weakening coefficient on the input energy of the beam for aqueous solutions: (A) BSA (25 wt. %), (B) BC (2 wt. %), (C) BSA (25 wt. %) with SWCNT (0.3 wt. %), (D) BC (2 wt. %) with SWCNT (0.3 wt. %).
    • Figure 3 shows the dependence of the light fluence distribution on the distance from the center of the beam. In aqueous dispersions of BCs without SWCNTs, the waist radius was equal to 22 μm, and in the same samples with SWCNT was 23 μm. The calculate...
    • 5. Conclusion
    • Fig. 2. Dependence of the normalized weakening coefficient on the position of the sample relative to the focus of the lens for aqueous solutions: (A) BSA (25 wt. %), (B) BC (2 wt. %), (C) BSA (25 wt. %) with SWCNT (0.3 wt. %), (D) BC (2 wt. %) with SW...
    • Fig. 3. Dependence of the light fluence distribution on the distance from the center of the beam for dispersions: (A) BC (2 wt. %), (B) BC (2 wt. %) with SWCNT (0.3 wt. %).
  • 20 37(2) _L.P. Ichkitidze, A.Yu. Gerasimenko.pdf
    • 1. Introduction
  • 21 37(2)_L.P. Ichkitidze, M.V. Belodedov.pdf
    • *e-mail: ichkitidze@bms.zone
  • 22 37(2)_L.P. Ichkitidze, A.Yu. Gerasimenko, V.M. Podgaetsky, S.V. Selishchev.pdf
    • 1. Introduction
    • 2. Layers – Group I
    • 3. Layers – Group II
    • 4. Conclusions
    • [48] A.Yu. Gerasimenko, A.A. Dedkova, L.P. Ichkitidze et al. // Optics and Spectroscopy 115 (2013) 283.
    • [49] L.P. Ichkitidze, M.S. Savelev, E.A. Bubnova et al. // Biomedical Engineering 49(1) (2015) 36.
  • 23 37(2)_Sultan Singh et al.pdf
    • PIEZOELECTRIC BASED ENERGY HARVESTER EMBEDDED IN SHOE FOR WEARABLE ELECTRONICS
      • Overview of Energy Harvesting System. The piezoelectric energy harvesting shoe system is able to harvest the energy from two points of contact during walking, which is shown in Fig. 1. The first point is the ‘Contact Phase’, which will obtain at the t...
      • 2. Design of sandwich type piezoelectric energy harvester
      • Fig. 2. Solid work model of energy harvester.
      • Working mechanism of energy harvester. The energy harvester works, when the upper movable plate of the piezoelectric energy harvester is subject to a compressive force, produced by human foot. The upper plate of energy harvester moves down and the PVD...
      • Fig. 6. Sandwiched structure. Fig. 7. Experimental setup.
      • Experimental results. In this experimental setup, a person of 60 kg weight wears the shoe/sandal and then walks at the speed of 2 steps per second (2 Hz).
    • 3. Design and working mechanism of curved shaped piezoelectric energy harvester
      • Fabricated model of energy harvester. Figure 12 shows a curved piezoelectric energy harvester, which is placed under the heel in the shoe/saddle. This harvester has two PVDF films, connected in series. The electrodes of the piezoelectric films are con...
      • Experimental results. In experiment, the harvester is appropriately placed in the shoe/sandal and the setup is worn on foot of a person with weight of 60 kgF. The person is then walks with the speed of approximately 2 steps/s.
    • 4. Combination of both energy harvesters
    • 5. Conclusions

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