在实际勘探中,浅部三维电性不均匀体的存在会导致大地电磁响应发生畸变,使阻抗张量偏离真实区域阻抗,影响后续反演和解释工作。本文主要利用1D(One-dimensional)区域构造中静态因子的统计学性质对多测点多频点畸变校正方法进行了改进。...在实际勘探中,浅部三维电性不均匀体的存在会导致大地电磁响应发生畸变,使阻抗张量偏离真实区域阻抗,影响后续反演和解释工作。本文主要利用1D(One-dimensional)区域构造中静态因子的统计学性质对多测点多频点畸变校正方法进行了改进。首先通过粒子群全局优化算法得到GB(Groom-Bailey,GB)分解参数中确定参数的全局最优解空间,将其作为高斯牛顿法的初值来进行局部优化,然后通过ssq(the Sum of the Squared Elements,SSQ)旋转不变量的统计特性得到不确定参数,最后利用正演模型验证了该算法的有效性。结果表明:该方法结合了粒子群算法和高斯牛顿法,避免结果陷入局部最优,通过正演模型发现不确定参数随测点位置呈“正态分布”,在异常体中心位置取最大,并且不确定参数可以指示静态效应的影响频段。同时静态校正后视电阻率和相位曲线与未受畸变影响的数据具有较高的重合度,说明该方法很好地消除了1D区域构造中多个浅部异常体的影响,恢复了原始区域阻抗信息。展开更多
In this paper, we study the phase diagram of a frustrated spin ladder model by applying the bosonization technique and the density-matrix renormalization-group （DMRG） algorithm. Effect of the intra-ehain next-neares...In this paper, we study the phase diagram of a frustrated spin ladder model by applying the bosonization technique and the density-matrix renormalization-group （DMRG） algorithm. Effect of the intra-ehain next-nearest- neighbor （NNN） super-exchange interaction is investigated in detail and the order parameters are calculated to detect the emergence of the dimerized phases. We find that the intra-chain NNN interaction plays a key role in inducing dimerized phases.展开更多
A novel algorithm for a rotation invariant template matching is proposed when the fluctuating scope of the rotation angle is limited within the region of [-20°,20°]. The matching candidates are selected usin...A novel algorithm for a rotation invariant template matching is proposed when the fluctuating scope of the rotation angle is limited within the region of [-20°,20°]. The matching candidates are selected using a computationally low cost improved correlation algorithm. "AND" operation is adopted to reduce the computational cost. Therefore the algorithm improves the matching speed consumedly. The simulation results verify the efficiency of the proposed method. Moreover,when the size of reference image is fixed,the advantage of this time-saving algorithm is more obvious as the increase of the size of the real time image. The matching speed of the proposed method is over 20 times faster than the speed of the two-level pyramid decomposing accelerating method.展开更多
A series of monotonic and rotational shearing tests are carried out on reconstituted clay using a hollow cylinder apparatus under undrained condition. In the rotational shearing tests, the principal stress axes rotate...A series of monotonic and rotational shearing tests are carried out on reconstituted clay using a hollow cylinder apparatus under undrained condition. In the rotational shearing tests, the principal stress axes rotate cyclically with the magnitudes of the principal stresses keeping constant. The anisotropy of the reconstituted clay is analyzed from the monotonic shearing tests. Obvious pore pressure is induced by the principal stress rotation alone even with shear stress q0=5 k Pa. Strain components also accumulate with increasing the number of cycles and increases suddenly at the onset of failure. The deviatoric shear strain of 7.5% can be taken as the failure criterion for clay subjected to the pure cyclic principal stress rotation. The intermediate principal stress parameter b plays a significant role in the development of pore pressure and strain. Specimens are weakened by cyclic rotational shearing as the shear modulus decreases with increasing the number of cycles, and the shear modulus reduces more quickly with larger b. Clear deviation between the directions of the principal plastic strain increment and the principal stress is observed during pure principal stress rotation. Both the coaxial and non-coaxial plastic mechanisms should be taken into consideration to simulate the deformation behavior of clay under pure principal stress rotation. The mechanism of the soil response to the pure principal stress rotation is discussed based on the experimental observations.展开更多
A scheme for implementing discrete quantum Fourier transform is proposed via quantum dots embedded in a microcavity, and then some of its applications are investigated, i.e., Deutsch 3ozsa. algorithm and Shor＇s quant...A scheme for implementing discrete quantum Fourier transform is proposed via quantum dots embedded in a microcavity, and then some of its applications are investigated, i.e., Deutsch 3ozsa. algorithm and Shor＇s quantum factoring. In particular, the detailed process of implementing one^qubit Deutsch Jozsa algorithm and the factorization of N = 15 are given. The microcavity mode is only virtually excited in the whole interaction, so the effective decoherent has slight effect on the current scheme. These schemes would be an important step to fabricate a solid quantum computer.展开更多
文摘在实际勘探中,浅部三维电性不均匀体的存在会导致大地电磁响应发生畸变,使阻抗张量偏离真实区域阻抗,影响后续反演和解释工作。本文主要利用1D(One-dimensional)区域构造中静态因子的统计学性质对多测点多频点畸变校正方法进行了改进。首先通过粒子群全局优化算法得到GB(Groom-Bailey,GB)分解参数中确定参数的全局最优解空间,将其作为高斯牛顿法的初值来进行局部优化,然后通过ssq(the Sum of the Squared Elements,SSQ)旋转不变量的统计特性得到不确定参数,最后利用正演模型验证了该算法的有效性。结果表明:该方法结合了粒子群算法和高斯牛顿法,避免结果陷入局部最优,通过正演模型发现不确定参数随测点位置呈“正态分布”,在异常体中心位置取最大,并且不确定参数可以指示静态效应的影响频段。同时静态校正后视电阻率和相位曲线与未受畸变影响的数据具有较高的重合度,说明该方法很好地消除了1D区域构造中多个浅部异常体的影响,恢复了原始区域阻抗信息。
基金Supported by the Chinese National Science Foundation of China under Grant Nos.10874003,11074004,and 11047160Numerical Computation of This Work was Carried out on the Parallel Computer Cluster of Institute for Condensed Matter Physics(ICMP) at School of Physics,Peking University
文摘In this paper, we study the phase diagram of a frustrated spin ladder model by applying the bosonization technique and the density-matrix renormalization-group （DMRG） algorithm. Effect of the intra-ehain next-nearest- neighbor （NNN） super-exchange interaction is investigated in detail and the order parameters are calculated to detect the emergence of the dimerized phases. We find that the intra-chain NNN interaction plays a key role in inducing dimerized phases.
基金the preparing Fund for defence equipment (No.6140517)
文摘A novel algorithm for a rotation invariant template matching is proposed when the fluctuating scope of the rotation angle is limited within the region of [-20°,20°]. The matching candidates are selected using a computationally low cost improved correlation algorithm. "AND" operation is adopted to reduce the computational cost. Therefore the algorithm improves the matching speed consumedly. The simulation results verify the efficiency of the proposed method. Moreover,when the size of reference image is fixed,the advantage of this time-saving algorithm is more obvious as the increase of the size of the real time image. The matching speed of the proposed method is over 20 times faster than the speed of the two-level pyramid decomposing accelerating method.
基金Projects(51338009,51178422)supported by the National Natural Science Foundation of China
文摘A series of monotonic and rotational shearing tests are carried out on reconstituted clay using a hollow cylinder apparatus under undrained condition. In the rotational shearing tests, the principal stress axes rotate cyclically with the magnitudes of the principal stresses keeping constant. The anisotropy of the reconstituted clay is analyzed from the monotonic shearing tests. Obvious pore pressure is induced by the principal stress rotation alone even with shear stress q0=5 k Pa. Strain components also accumulate with increasing the number of cycles and increases suddenly at the onset of failure. The deviatoric shear strain of 7.5% can be taken as the failure criterion for clay subjected to the pure cyclic principal stress rotation. The intermediate principal stress parameter b plays a significant role in the development of pore pressure and strain. Specimens are weakened by cyclic rotational shearing as the shear modulus decreases with increasing the number of cycles, and the shear modulus reduces more quickly with larger b. Clear deviation between the directions of the principal plastic strain increment and the principal stress is observed during pure principal stress rotation. Both the coaxial and non-coaxial plastic mechanisms should be taken into consideration to simulate the deformation behavior of clay under pure principal stress rotation. The mechanism of the soil response to the pure principal stress rotation is discussed based on the experimental observations.
基金Supported by National Natural Science Foundation of China (NSFC) under Grant Nos.60678022 and 10704001the Specialized Research Fund for the Doctoral Program of Higher Education under Grant No.20060357008+1 种基金Anhui Provincial Natural Science Foundation under Grant No.070412060the Program of the Education Department of Anhui Province under Grant Nos.KJ2008A28ZC,KJ2008B83ZC,KJ2008B265,and 2009A048Z
文摘A scheme for implementing discrete quantum Fourier transform is proposed via quantum dots embedded in a microcavity, and then some of its applications are investigated, i.e., Deutsch 3ozsa. algorithm and Shor＇s quantum factoring. In particular, the detailed process of implementing one^qubit Deutsch Jozsa algorithm and the factorization of N = 15 are given. The microcavity mode is only virtually excited in the whole interaction, so the effective decoherent has slight effect on the current scheme. These schemes would be an important step to fabricate a solid quantum computer.
