Thư viện tài liệu, ebook tổng hợp lớn nhất Việt Nam

In this study, we have investigated the fluorescence of sound teeth, teeth with dental calculus, cavitated caries and hidden caries. The sound teeth emitted the blue-green fluorescence on a white background with broad emission spectra from 410 nm to 650 nm (with three peaks at 450 nm, 500 nm and 520 nm), while the samples with different type...

10 trang | Chia sẻ: yendt2356 | Ngày: 27/11/2020 | Lượt xem: 853 | Lượt tải: 1

CONCLUSION AND FURTHER DEVELOPMENT The paper has proposed a new approach to detect and locate the two-phase short-circuit fault on the three-phase transmission lines. The proposed method uses the Daubechies wavelet decompositions of the phase currents signals from the beginning of the transmission line only. For the selected configuration o...

7 trang | Chia sẻ: thucuc2301 | Ngày: 27/11/2020 | Lượt xem: 786 | Lượt tải: 1

The subroutine is verified via the simple finite element models of plane strain and hydrostatic tension. The analysis results based on Dung’s model have been compared to the GTN model in Abaqus and the results from literature. It is shown that the Dung’s model is capacable of predicting damage localization of metallic material. The two deep...

11 trang | Chia sẻ: yendt2356 | Ngày: 27/11/2020 | Lượt xem: 841 | Lượt tải: 1

We have successfully extended the consecutive-interpolation finite element method (CFEM) to solve the heat transfer problem in 2D. The CFEM provides some advantages as follows: Smooth temperature gradient without using any smoothing technique, while retaining increasing the number of degrees of freedom. Higher accuracy due to the higher-orde...

8 trang | Chia sẻ: yendt2356 | Ngày: 27/11/2020 | Lượt xem: 874 | Lượt tải: 1

CONCLUSION - The article gave the kinetic model and parameter transmission function of the tower dryer, object is dried corn kernels, these results are useful for the process design calculations tower dryer as well as calculate the all drivers grain corn drying in the tower dryer. - Transmission functions have been established which are con...

5 trang | Chia sẻ: thucuc2301 | Ngày: 27/11/2020 | Lượt xem: 806 | Lượt tải: 1

A meshless extended radial point interpolation method (XRPIM) has been proposed for cracks analysis in orthotropic median under different loadings and several material orientations. This method is convenient in treating the Dirichlet boundary conditions because of the RPIM shape functions satisfying the Kronecker’s delta property. Several nu...

9 trang | Chia sẻ: yendt2356 | Ngày: 27/11/2020 | Lượt xem: 954 | Lượt tải: 1

CONCLUSION AFPM motor with integrated radial magnetic bearing at the two ends of the sharp, in working process its rotor does not only rotate but also moves axially. To prevent the rotor from moving axially and keep the motor compact, an axial magnetic bearing is integrated. By using the orthogonal transformations to transform coordinator ...

7 trang | Chia sẻ: thucuc2301 | Ngày: 27/11/2020 | Lượt xem: 925 | Lượt tải: 1

The moving shock wave problem was simulated with finite difference method. The fluxes at cell interfaces were calculated by four different schemes. The linearization of the Jacobian matrix, i.e. utilizing the Roe-averaged matrix, plays an important role in the Roe’s Firstorder Upwind scheme, the Sweby’s TVD scheme and the ENO scheme. While th...

16 trang | Chia sẻ: yendt2356 | Ngày: 27/11/2020 | Lượt xem: 881 | Lượt tải: 1

CONCLUSIONS In this work, vibration frequency analysis of fluid-filled laminated composite circular cylindrical shells based on elastic foundations is presented for clamped-free conditions. The Dynamic Stiffness Method is used to derive the composite shell frequency equation including the elastic foundation and fluid loading terms. The infl...

5 trang | Chia sẻ: thucuc2301 | Ngày: 27/11/2020 | Lượt xem: 887 | Lượt tải: 1

In this paper, firstly we present briefly to the Vector model of gravitational field and the modified expression of gravitational force. Then we study the motion of an object in the modified field (the modified gravitational field of Milky Way). Results of numerical study indicated that: in Newtonian region, the motion of the object is the same ...

5 trang | Chia sẻ: yendt2356 | Ngày: 27/11/2020 | Lượt xem: 1029 | Lượt tải: 1