By introducing noncanonical vortex pairs to partially coherent beams, spatial correlation singularity (SCS) and orbital angular momenta (OAM) of the resulting beams are studied using the Fraunhofer diffraction integra...By introducing noncanonical vortex pairs to partially coherent beams, spatial correlation singularity (SCS) and orbital angular momenta (OAM) of the resulting beams are studied using the Fraunhofer diffraction integral. The effect of noncanonical strength, off-axis distance and vortex sign on spatial correlation singularities in far field is stressed. Furthermore, far-field OAM spectra and densities are also investigated, and the OAM detection and crosstalk probabilities are discussed. The results show that the number of dislocations of SCS always equals the sum of absolute values of topological charges for canonical or noncanonical vortex pairs. Although the sum of the product of each OAM mode and its power weight equals the algebraic sum of topological charges for canonical vortex pairs, the relationship no longer holds in the noncanonical case except for opposite-charge vortex pairs. The changes of off-axis distance, noncanonical strength or coherence length can lead to a more dominant power in adjacent mode than that in center detection mode, which also indicates that crosstalk probabilities of adjacent modes exceed the center detection probability. This work may provide potential applications in OAM-based optical communication, imaging, sensing and computing.展开更多
With positron annihilation radiation one dimension angular-correlation device, it is measured that positron annihilation radiation one dimension angular-correlation curves of polycrystal sodium ion conductor Na5Y1-x C...With positron annihilation radiation one dimension angular-correlation device, it is measured that positron annihilation radiation one dimension angular-correlation curves of polycrystal sodium ion conductor Na5Y1-x CrxSi4O12 (NYCS) system. After electron momentum distribution curves are normalized, linear parameters are calculated. The parameters H, W and S show the change of Na+ ion vacancy concentration in NYCS series samples. The results show that parameters H, W and S of one dimension angular-correlation curves of those samples vary greatly with Cr2O3 contents. With Cr2O3 content increasing, H and S parameters increase, but W decreases, and reaches extremes at x=0.05; then with Cr2O3 adding continually, parameters H and S decrease gradually, parameter W increases gradually. This shows that, in addtion to Cr2O3, the conductivity has close relation with the concentration of Na+ ion vacancy.展开更多
In this paper we describe a method for improving the angular resolution of the electron backscatter diffraction(EBSD) technique based on a correlative matching of EBSD patterns.Standard image interpolation methods are...In this paper we describe a method for improving the angular resolution of the electron backscatter diffraction(EBSD) technique based on a correlative matching of EBSD patterns.Standard image interpolation methods are used to detect shifts between selected regions of the EBSD patterns to an accuracy of one tenth of a pixel.Simulated data sets are used to show that such accuracy,combined with a small angle approximation in calculation of the rotation angle,allows determination of the misorientation between patterns to an accuracy of 0.01 degrees.The method is tested on samples of both single crystal aluminum and recrystallized nickel.The results demonstrate the accuracy and stability of the new method compared to the conventional method.展开更多
Angular correlation of excitation functions in dissipative heavy ion collision 27Al+27Al has been measured. The incident beam energies ranged from 114MeV to 127MeV in steps of 200keV. The angular analysis region was c...Angular correlation of excitation functions in dissipative heavy ion collision 27Al+27Al has been measured. The incident beam energies ranged from 114MeV to 127MeV in steps of 200keV. The angular analysis region was continuous from 50°to 90°in the center of mass system. An angular coherent width, at least 4n° was obtained. This long-range angular correlation could not be interpreted in the framework of the standard statistical reaction theory with state of equilibrium or near equilibrium, maybe it reveals the formation of a new kind of dissipative structure in the reaction of 27Al+27AI with the state that is far from equilibrium.展开更多
A spatial channel propagation model is presented. Consider a uniform linear antenna （ULA） at the base station （BS） and narrowband signals transmitted at the mobile. In two types of propagating environments： indoo...A spatial channel propagation model is presented. Consider a uniform linear antenna （ULA） at the base station （BS） and narrowband signals transmitted at the mobile. In two types of propagating environments： indoor and outdoor, performance of low spatial correlation is investigated and some results are provided, which are significant to an,3. lyze the performance of diversity systems and configuration of army. The results also show that the configuration of array with either smaller angular spread or bigger angle of arrival （AOA） dominates the impact on spatial correlation, and that increasing angular spread or decreasing AOA diminishes, or even eliminates this impact.展开更多
In multiple experiments plates of melanoma cells separated by either 3 m or 1.7 km were placed in the centers of toroids. A specific protocol of changing, angular velocity, pulsed magnetic fields that has been shown t...In multiple experiments plates of melanoma cells separated by either 3 m or 1.7 km were placed in the centers of toroids. A specific protocol of changing, angular velocity, pulsed magnetic fields that has been shown to produce excess correlation in photon durations and shift in proton concentrations (pH) in spring water were generated around both plates of cells. Serial injections of 50 μL of standard concentrations of hydrogen peroxide into the “local” plates of cells during the 12 min of field activation produced conspicuous cell death (reduction of viable cells by about 50%) with comparable diminishments of cell numbers in the non-local plates of cells within 24 hr but only if both loci separated by either 3 m or 1.7 km had shared the “excess correlation” magnetic field sequence. The non-local effect did not occur if the magnetic fields had not been present. Higher or lower concentrations of peroxide or concentrations that eliminated all of the cells or very few cells in the local dishes were associated with no significant diminishment of non-local cell growth. The data indicate that there must be a critical number of cells remaining viable following the local chemical reaction for the excess correlation to be manifested in the non-local cells. We suggest that this specific spatial-temporal pattern of fields generated within the paired toroidal geometries promotes transposition of virtual chemical reactions as an information field. Calculations of the energy available per cell and per volume of the quantity of reactants injected into the local space from the intensity of the changing velocity toroidal magnetic field support previous measurements and derivations that the units of information transposition may involve discrete quantities that represent equivalents of photons, electrons and protons.展开更多
In engineering,all movable expanse revolving objects manifest gyroscopic effects.These effects are created by the action of the outer load on the revolving items whose rotating mass originates eight inertial torques a...In engineering,all movable expanse revolving objects manifest gyroscopic effects.These effects are created by the action of the outer load on the revolving items whose rotating mass originates eight inertial torques about two axes.Two torques of centrifugal forces,one torque of the Coriolis force originated by the rotating distributed mass,and the torque of the change in the angular momentum of the center mass act about each axis.The inertial torques activate rotations of the gyroscope by the determined correlation.Inertial torques depend on their geometry and orientation at the spatial coordinate system.The known analytical model for the rotation of the revolving disc about axes contains a mechanical error.This error was obtained by the incorrect integration of the centrifugal inertial torque.The corrected inertial torque yields the accurate expression for the interacted rotations of the revolving disc about axes.展开更多
光检测磁共振(Optically Detected Magnetic Resonance,ODMR)型磁力仪灵敏度的角相关特性决定了磁力仪的最佳工作角度范围。推导了ODMR型磁力仪不同偏振光、射频电磁场、被测磁场构型下检测信号的数学表达,基于此深入分析了基于测量水...光检测磁共振(Optically Detected Magnetic Resonance,ODMR)型磁力仪灵敏度的角相关特性决定了磁力仪的最佳工作角度范围。推导了ODMR型磁力仪不同偏振光、射频电磁场、被测磁场构型下检测信号的数学表达,基于此深入分析了基于测量水平分量的M_(X)型磁力仪、测量垂直分量的M_(Z)型磁力仪的检测灵敏度的角度依赖关系,结果表明M_(X)、M_(Z)型磁力仪在B_(rf)∥k与B_(rf)⊥k条件下的灵敏度角相关特性存在明显差异,基于此得到不同构型的ODMR型磁力仪进行磁场测量时的最佳安装角度。展开更多
雷达高分辨距离像(radar high resolution range profile,HRRP)具有姿态敏感性的特点,一种有效的方法是分别对一组不发生散射点越距离单元走动角域范围内的HRRP样本进行处理。提出基于HRRP回波功率谱的顺序判别自适应分帧算法,通过对全...雷达高分辨距离像(radar high resolution range profile,HRRP)具有姿态敏感性的特点,一种有效的方法是分别对一组不发生散射点越距离单元走动角域范围内的HRRP样本进行处理。提出基于HRRP回波功率谱的顺序判别自适应分帧算法,通过对全局HRRP样本进行迭代搜索来确定数据划分边界,并自适应划分角域个数。所提方法依据散射点模型理论,考虑功率谱互相关系数变化规律,有效抑制了HRRP存在"距离像起伏剧烈"的样本。与自适应高斯分类器划分角域方法相比,所提方法在样本数据较小的情况下,仍可以有效地对目标进行角域划分。同时,与传统的利用互相关系数分帧方法和等间隔角域划分方法相比,所提方法可以有效降低识别运算量,减少识别算法处理时间,通过对3类舰船目标的仿真和3类民用船只的外场实测数据分析,表明所提方法是有效的。展开更多
文摘By introducing noncanonical vortex pairs to partially coherent beams, spatial correlation singularity (SCS) and orbital angular momenta (OAM) of the resulting beams are studied using the Fraunhofer diffraction integral. The effect of noncanonical strength, off-axis distance and vortex sign on spatial correlation singularities in far field is stressed. Furthermore, far-field OAM spectra and densities are also investigated, and the OAM detection and crosstalk probabilities are discussed. The results show that the number of dislocations of SCS always equals the sum of absolute values of topological charges for canonical or noncanonical vortex pairs. Although the sum of the product of each OAM mode and its power weight equals the algebraic sum of topological charges for canonical vortex pairs, the relationship no longer holds in the noncanonical case except for opposite-charge vortex pairs. The changes of off-axis distance, noncanonical strength or coherence length can lead to a more dominant power in adjacent mode than that in center detection mode, which also indicates that crosstalk probabilities of adjacent modes exceed the center detection probability. This work may provide potential applications in OAM-based optical communication, imaging, sensing and computing.
文摘With positron annihilation radiation one dimension angular-correlation device, it is measured that positron annihilation radiation one dimension angular-correlation curves of polycrystal sodium ion conductor Na5Y1-x CrxSi4O12 (NYCS) system. After electron momentum distribution curves are normalized, linear parameters are calculated. The parameters H, W and S show the change of Na+ ion vacancy concentration in NYCS series samples. The results show that parameters H, W and S of one dimension angular-correlation curves of those samples vary greatly with Cr2O3 contents. With Cr2O3 content increasing, H and S parameters increase, but W decreases, and reaches extremes at x=0.05; then with Cr2O3 adding continually, parameters H and S decrease gradually, parameter W increases gradually. This shows that, in addtion to Cr2O3, the conductivity has close relation with the concentration of Na+ ion vacancy.
基金Supported by the National Natural Science Foundation of China （NSFC） under contract no： 50571049. This work was supported by the National Natural Science Foundation of China （NSFC） under contract no： 50571049.
文摘In this paper we describe a method for improving the angular resolution of the electron backscatter diffraction(EBSD) technique based on a correlative matching of EBSD patterns.Standard image interpolation methods are used to detect shifts between selected regions of the EBSD patterns to an accuracy of one tenth of a pixel.Simulated data sets are used to show that such accuracy,combined with a small angle approximation in calculation of the rotation angle,allows determination of the misorientation between patterns to an accuracy of 0.01 degrees.The method is tested on samples of both single crystal aluminum and recrystallized nickel.The results demonstrate the accuracy and stability of the new method compared to the conventional method.
基金the National Natural Science Foundation of China (No.19775057), the Chinese Academyof Sciences (KJ95T-03) and the Laboratoric
文摘Angular correlation of excitation functions in dissipative heavy ion collision 27Al+27Al has been measured. The incident beam energies ranged from 114MeV to 127MeV in steps of 200keV. The angular analysis region was continuous from 50°to 90°in the center of mass system. An angular coherent width, at least 4n° was obtained. This long-range angular correlation could not be interpreted in the framework of the standard statistical reaction theory with state of equilibrium or near equilibrium, maybe it reveals the formation of a new kind of dissipative structure in the reaction of 27Al+27AI with the state that is far from equilibrium.
基金This project was supported by the National High-Tech Research and Development Program (2002AA123032).
文摘A spatial channel propagation model is presented. Consider a uniform linear antenna （ULA） at the base station （BS） and narrowband signals transmitted at the mobile. In two types of propagating environments： indoor and outdoor, performance of low spatial correlation is investigated and some results are provided, which are significant to an,3. lyze the performance of diversity systems and configuration of army. The results also show that the configuration of array with either smaller angular spread or bigger angle of arrival （AOA） dominates the impact on spatial correlation, and that increasing angular spread or decreasing AOA diminishes, or even eliminates this impact.
文摘In multiple experiments plates of melanoma cells separated by either 3 m or 1.7 km were placed in the centers of toroids. A specific protocol of changing, angular velocity, pulsed magnetic fields that has been shown to produce excess correlation in photon durations and shift in proton concentrations (pH) in spring water were generated around both plates of cells. Serial injections of 50 μL of standard concentrations of hydrogen peroxide into the “local” plates of cells during the 12 min of field activation produced conspicuous cell death (reduction of viable cells by about 50%) with comparable diminishments of cell numbers in the non-local plates of cells within 24 hr but only if both loci separated by either 3 m or 1.7 km had shared the “excess correlation” magnetic field sequence. The non-local effect did not occur if the magnetic fields had not been present. Higher or lower concentrations of peroxide or concentrations that eliminated all of the cells or very few cells in the local dishes were associated with no significant diminishment of non-local cell growth. The data indicate that there must be a critical number of cells remaining viable following the local chemical reaction for the excess correlation to be manifested in the non-local cells. We suggest that this specific spatial-temporal pattern of fields generated within the paired toroidal geometries promotes transposition of virtual chemical reactions as an information field. Calculations of the energy available per cell and per volume of the quantity of reactants injected into the local space from the intensity of the changing velocity toroidal magnetic field support previous measurements and derivations that the units of information transposition may involve discrete quantities that represent equivalents of photons, electrons and protons.
文摘In engineering,all movable expanse revolving objects manifest gyroscopic effects.These effects are created by the action of the outer load on the revolving items whose rotating mass originates eight inertial torques about two axes.Two torques of centrifugal forces,one torque of the Coriolis force originated by the rotating distributed mass,and the torque of the change in the angular momentum of the center mass act about each axis.The inertial torques activate rotations of the gyroscope by the determined correlation.Inertial torques depend on their geometry and orientation at the spatial coordinate system.The known analytical model for the rotation of the revolving disc about axes contains a mechanical error.This error was obtained by the incorrect integration of the centrifugal inertial torque.The corrected inertial torque yields the accurate expression for the interacted rotations of the revolving disc about axes.
文摘光检测磁共振(Optically Detected Magnetic Resonance,ODMR)型磁力仪灵敏度的角相关特性决定了磁力仪的最佳工作角度范围。推导了ODMR型磁力仪不同偏振光、射频电磁场、被测磁场构型下检测信号的数学表达,基于此深入分析了基于测量水平分量的M_(X)型磁力仪、测量垂直分量的M_(Z)型磁力仪的检测灵敏度的角度依赖关系,结果表明M_(X)、M_(Z)型磁力仪在B_(rf)∥k与B_(rf)⊥k条件下的灵敏度角相关特性存在明显差异,基于此得到不同构型的ODMR型磁力仪进行磁场测量时的最佳安装角度。
文摘雷达高分辨距离像(radar high resolution range profile,HRRP)具有姿态敏感性的特点,一种有效的方法是分别对一组不发生散射点越距离单元走动角域范围内的HRRP样本进行处理。提出基于HRRP回波功率谱的顺序判别自适应分帧算法,通过对全局HRRP样本进行迭代搜索来确定数据划分边界,并自适应划分角域个数。所提方法依据散射点模型理论,考虑功率谱互相关系数变化规律,有效抑制了HRRP存在"距离像起伏剧烈"的样本。与自适应高斯分类器划分角域方法相比,所提方法在样本数据较小的情况下,仍可以有效地对目标进行角域划分。同时,与传统的利用互相关系数分帧方法和等间隔角域划分方法相比,所提方法可以有效降低识别运算量,减少识别算法处理时间,通过对3类舰船目标的仿真和3类民用船只的外场实测数据分析,表明所提方法是有效的。
