The Experts below are selected from a list of 30375 Experts worldwide ranked by ideXlab platform
Daichao Sheng - One of the best experts on this subject based on the ideXlab platform.
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seismic wave Propagation Characteristic and its effects on the failure of steep jointed anti dip rock slope
Landslides, 2019Co-Authors: Shuai Zhang, Xiaoxue Deng, Daichao ShengAbstract:Discontinuities, such as joints and beddings, usually play a significant role in the seismic response and corresponding failure process of slopes, especially for anti-dip rock slide according to field observations. Shaking table tests associated with numerical analyses are carried out in this paper to explore the effect of seismic wave on response of jointed anti-dip rock slopes. Shaking table tests involve anti-dip rock slope models with different rock types and different excitation intensities. Ten accelerometers are installed inside each slope model to monitor the dynamic response and spectrum shifting Characteristics. It is found that the area of failure zone in the soft rock anti-dip slope is approximate 1.5 times the size of that in the hard rock anti-dip slope. Meanwhile, the width and ridge number of the fast Fourier-transformation spectrum along the slope surface can reveal the internal damage features within the anti-dip rock slopes, and the multiple failure planes can also be recognized according to the variation of distance between the innermost and outermost ridges in the fast Fourier-transformation spectrum. Moreover, the distinct element method incorporating a damage model is used to interpret the test results and to identify the main influencing factors for seismic instability. It is found that the failure pattern of a jointed anti-dip rock slope is more sensitive to bedding inclination than to joint inclination.
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correction to seismic wave Propagation Characteristic and its effects on the failure of steep jointed anti dip rock slope
Landslides, 2019Co-Authors: Shuai Zhang, Xiaoxue Deng, Daichao ShengAbstract:The published version of this article, unfortunately, contained error. A compass went unconverted in the upper-right corner of Fig. 1. Given in this article is the correct image.
Shuai Zhang - One of the best experts on this subject based on the ideXlab platform.
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seismic wave Propagation Characteristic and its effects on the failure of steep jointed anti dip rock slope
Landslides, 2019Co-Authors: Shuai Zhang, Xiaoxue Deng, Daichao ShengAbstract:Discontinuities, such as joints and beddings, usually play a significant role in the seismic response and corresponding failure process of slopes, especially for anti-dip rock slide according to field observations. Shaking table tests associated with numerical analyses are carried out in this paper to explore the effect of seismic wave on response of jointed anti-dip rock slopes. Shaking table tests involve anti-dip rock slope models with different rock types and different excitation intensities. Ten accelerometers are installed inside each slope model to monitor the dynamic response and spectrum shifting Characteristics. It is found that the area of failure zone in the soft rock anti-dip slope is approximate 1.5 times the size of that in the hard rock anti-dip slope. Meanwhile, the width and ridge number of the fast Fourier-transformation spectrum along the slope surface can reveal the internal damage features within the anti-dip rock slopes, and the multiple failure planes can also be recognized according to the variation of distance between the innermost and outermost ridges in the fast Fourier-transformation spectrum. Moreover, the distinct element method incorporating a damage model is used to interpret the test results and to identify the main influencing factors for seismic instability. It is found that the failure pattern of a jointed anti-dip rock slope is more sensitive to bedding inclination than to joint inclination.
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correction to seismic wave Propagation Characteristic and its effects on the failure of steep jointed anti dip rock slope
Landslides, 2019Co-Authors: Shuai Zhang, Xiaoxue Deng, Daichao ShengAbstract:The published version of this article, unfortunately, contained error. A compass went unconverted in the upper-right corner of Fig. 1. Given in this article is the correct image.
Xiaoxue Deng - One of the best experts on this subject based on the ideXlab platform.
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seismic wave Propagation Characteristic and its effects on the failure of steep jointed anti dip rock slope
Landslides, 2019Co-Authors: Shuai Zhang, Xiaoxue Deng, Daichao ShengAbstract:Discontinuities, such as joints and beddings, usually play a significant role in the seismic response and corresponding failure process of slopes, especially for anti-dip rock slide according to field observations. Shaking table tests associated with numerical analyses are carried out in this paper to explore the effect of seismic wave on response of jointed anti-dip rock slopes. Shaking table tests involve anti-dip rock slope models with different rock types and different excitation intensities. Ten accelerometers are installed inside each slope model to monitor the dynamic response and spectrum shifting Characteristics. It is found that the area of failure zone in the soft rock anti-dip slope is approximate 1.5 times the size of that in the hard rock anti-dip slope. Meanwhile, the width and ridge number of the fast Fourier-transformation spectrum along the slope surface can reveal the internal damage features within the anti-dip rock slopes, and the multiple failure planes can also be recognized according to the variation of distance between the innermost and outermost ridges in the fast Fourier-transformation spectrum. Moreover, the distinct element method incorporating a damage model is used to interpret the test results and to identify the main influencing factors for seismic instability. It is found that the failure pattern of a jointed anti-dip rock slope is more sensitive to bedding inclination than to joint inclination.
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correction to seismic wave Propagation Characteristic and its effects on the failure of steep jointed anti dip rock slope
Landslides, 2019Co-Authors: Shuai Zhang, Xiaoxue Deng, Daichao ShengAbstract:The published version of this article, unfortunately, contained error. A compass went unconverted in the upper-right corner of Fig. 1. Given in this article is the correct image.
Yosuke Todo - One of the best experts on this subject based on the ideXlab platform.
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integral cryptanalysis on full misty1
Journal of Cryptology, 2017Co-Authors: Yosuke TodoAbstract:MISTY1 is a block cipher designed by Matsui in 1997. It was well evaluated and standardized by projects, such as CRYPTREC, ISO/IEC, and NESSIE. In this paper, we propose a key recovery attack on the full MISTY1, i.e., we show that 8-round MISTY1 with 5 FL layers does not have 128-bit security. Many attacks against MISTY1 have been proposed, but there is no attack against the full MISTY1. Therefore, our attack is the first cryptanalysis against the full MISTY1. We construct a new integral Characteristic by using the Propagation Characteristic of the division property, which was proposed in EUROCRYPT 2015. We first improve the division property by optimizing the division property for a public S-box and then construct a 6-round integral Characteristic on MISTY1. Finally, we recover the secret key of the full MISTY1 with \(2^{63.58}\) chosen plaintexts and \(2^{121}\) time complexity. Moreover, if we use \(2^{63.994}\) chosen plaintexts, the time complexity for our attack is reduced to \(2^{108.3}\). Note that our cryptanalysis is a theoretical attack. Therefore, the practical use of MISTY1 will not be affected by our attack.
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division property efficient method to estimate upper bound of algebraic degree
International Conference on Cryptology in Malaysia, 2016Co-Authors: Yosuke TodoAbstract:We proposed the division property, which is a new method to find integral Characteristics, at EUROCRYPT2015. Then, we applied this technique to analyze the full MISTY1 at CRYPTO2015. After the proposal of the two papers, many follow-up results have been researched at major conferences. In this paper, we first expound the integral and higher-order differential cryptanalyses in detail and focus the similarities and differences. As a result, we conclude that both cryptanalyses are the same in practical. Nevertheless, both cryptanalyses use the different method to find Characteristics: the Propagation Characteristic of integral properties is evaluated in the integral cryptanalysis and the upper bound of the algebraic degree is evaluated in the higher-order differential cryptanalysis. Our first discovery is that each of the two methods has its own advantages and disadvantages. Moreover, there are some experimental Characteristics that cannot be proven by either of both methods. These observation causes significant motivation that we developed the division property. We next expound some important follow-up results, e.g., the bit-based division property at FSE2016, the parity set at CRYPTO2016, the MILP-based Propagation search at ASIACRYPT2016.
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integral cryptanalysis on full misty1
International Cryptology Conference, 2015Co-Authors: Yosuke TodoAbstract:MISTY1 is a block cipher designed by Matsui in 1997. It was well evaluated and standardized by projects, such as CRYPTREC, ISO/IEC, and NESSIE. In this paper, we propose a key recovery attack on the full MISTY1, i.e., we show that 8-round MISTY1 with 5 FL layers does not have 128-bit security. Many attacks against MISTY1 have been proposed, but there is no attack against the full MISTY1. Therefore, our attack is the first cryptanalysis against the full MISTY1. We construct a new integral Characteristic by using the Propagation Characteristic of the division property, which was proposed in 2015. We first improve the division property by optimizing a public S-box and then construct a 6-round integral Characteristic on MISTY1. Finally, we recover the secret key of the full MISTY1 with \(2^{63.58}\) chosen plaintexts and \(2^{121}\) time complexity. Moreover, if we can use \(2^{63.994}\) chosen plaintexts, the time complexity for our attack is reduced to \(2^{107.9}\). Note that our cryptanalysis is a theoretical attack. Therefore, the practical use of MISTY1 will not be affected by our attack.
Weixiong Chen - One of the best experts on this subject based on the ideXlab platform.
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Experimental investigation on the second dominant frequency of supersonic steam jet condensation oscillation and its Propagation Characteristic
Annals of Nuclear Energy, 2016Co-Authors: Weixiong Chen, Quanbin Zhao, Yingchun Wang, Daotong ChongAbstract:Abstract Submerged steam jet condensation is widely applied in the industry, and the condensation oscillation during the condensation process is highly related to the safe operation of devices. The first dominant frequency has been frequently studied; thus this study focuses on the Characteristic of the second dominant frequency of supersonic steam condensation oscillation. Results show that the second dominant frequency is generated by the oscillation of the detached steam bubble. The frequency value of the supersonic steam is lower than that of the sonic steam, and increases with the design pressure ratio. Two different methods, namely, experimental correlation and theoretical calculation, are proposed to obtain the second dominant frequency. Moreover, its Propagation Characteristic is investigated under different operation conditions. An energy peak, which corresponds to the position where the steam bubble separates, always appears. The energy amplitude peaks at a low design pressure ratio when the steam mass flux is not larger than 600 kg·m −2 ·s −1 , and it peaks at a high design pressure ratio when the steam mass flux increases. A theoretical method is established to obtain the second dominant frequency energy distribution, and its effectiveness is verified against experimental results. Furthermore, owing to the barrier effect of steam plume, the upstream deviation is slightly higher than the downstream deviation.
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Experimental and theoretical study on the second dominant frequency in submerged steam jet condensation
Experimental Thermal and Fluid Science, 2015Co-Authors: Quanbin Zhao, Fang Yuan, Yuelei Cong, Weixiong ChenAbstract:Abstract Condensation oscillation of steam jet is of high importance for industrial facility. In this study, the mechanism and Propagation Characteristic of the second dominant frequency is investigated. Firstly, the second dominant frequency is found under all the test conditions based on frequency spectrum. The second dominant frequency decreases with the rise of water temperature and steam mass flux. Then, the second dominant frequency is proved to be generated by the separated steam bubbles oscillation based on the bubble oscillation theory. And the theoretical oscillation frequency equation of separated steam bubble is used to predict the second dominant frequency, the predicted deviation ranges from −17% to 6%. Furthermore, the Propagation Characteristic of the second dominant frequency is investigated, and a theoretical Propagation equation for the second dominant frequency is derived. Then, the axial and radial distribution Characteristic of oscillation amplitude and energy of the second dominant frequency are analyzed and researched. In the downstream flow field and the radial direction, the Propagation Characteristic of steam bubble oscillation wave is well corresponding to the predicted results. However, in the upstream flow field, due to the effect of steam plume, the oscillation amplitude and energy of the second dominant frequency attenuate rapidly and the experimental data are much smaller than the predicted value.
