交流–电网换相换流器型高压直流输电(AC-line commutated converter high voltage direct current,AC-(LCC)DC)混联系统的电磁暂态初始化在计算模型上可表述为一个扰动的可分无源动力系统。因此,将无源动力系统的显式保积算法应用于电...交流–电网换相换流器型高压直流输电(AC-line commutated converter high voltage direct current,AC-(LCC)DC)混联系统的电磁暂态初始化在计算模型上可表述为一个扰动的可分无源动力系统。因此,将无源动力系统的显式保积算法应用于电磁暂态初始化计算。采用相空间分析方法,对基于逐次积分法的电磁暂态初始化方法的收敛条件以及收敛速率进行了定量分析。在上述基础上,提出了一类新的、系统化的初始化计算方法,该方法计算格式简单、易于编程,在计算效率上具有明显的优势。算例结果验证了所提方法的有效性。展开更多
A new algorithm called the weighted least square discrete parameterization (WLSDP) is presented for the parameterization of triangular meshes over a convex planar region. This algorithm is the linear combination of th...A new algorithm called the weighted least square discrete parameterization (WLSDP) is presented for the parameterization of triangular meshes over a convex planar region. This algorithm is the linear combination of the discrete Conformal mapping(DCM) and the discrete Authalic mapping(DAM). It provides the good properties of both DCM and DAM, such as robustness and low distortion. By adjusting the scaling factor q embedded in the WLSDP, satisfactory parameterizations in different special applications can be achieved.展开更多
Based on a new discrete three-by-three matrix spectral problem, a hierarchy of integrable lattice equations with three potentials is proposed through discrete zero-curvature representation, and the resulting integrabl...Based on a new discrete three-by-three matrix spectral problem, a hierarchy of integrable lattice equations with three potentials is proposed through discrete zero-curvature representation, and the resulting integrable lattice equation reduces to the classical Toda lattice equation. It is shown that the hierarchy possesses a HamiItonian structure and a hereditary recursion operator. Finally, infinitely many conservation laws of corresponding lattice systems are obtained by a direct way.展开更多
First mirrors are the facing components of plasma optical diagnostics system for superconductivity and other fusion devices. Due to high level of neutron and gamma radiation, the lifetime and optical state of first mi...First mirrors are the facing components of plasma optical diagnostics system for superconductivity and other fusion devices. Due to high level of neutron and gamma radiation, the lifetime and optical state of first mirror will face an enormous challenge. The degradation of the optical character on the mirror surface mainly comes from the two opposite processes, one is erosion, the other is re-deposition. Which proces plays more important role need testing in present machines. Before 2001 the experimental studies mainly put on material character simulation in a laboratory. Recently, the sample of the first mirror has been investigated in actual fusion device and modification of mirror optical properties was made. But how to protect mirror and make the lifetime longer will be an issue need solving urgently.展开更多
It is generally believed in existing literature that China＇s minimum wage is too low and must be raised substantially. Such a view is highly misleading given the inconsistent statistical standards for minimum and ave...It is generally believed in existing literature that China＇s minimum wage is too low and must be raised substantially. Such a view is highly misleading given the inconsistent statistical standards for minimum and average wages. In order to ensure comparability, this paper has adjusted the statistical scope for minimum and average wages respectively. If employees of urban private and self-employed businesses are included in calculating the average wage, the minimum-to-average wage ratio will increase by about 0.06; if the minimum wage standards of various localities include personal contributions to social insurance and the housing fund, the minimum-to-average wage ratio will increase by 0.008; if overtime pay is deducted from the average wage, the minimum-to-average wage ratio will further increase by around O. 06.In addition, if the median wage is used in place of the average wage, the minimum-to-average wage ratio will increase by at least 0.08. After these adjustments, China＇s minimum-to-average wage ratio for 2013 will increase from 0.28 to 0.49, which is within the range of between 0.40 and 0.60 that is recognized internationally as reasonable. Our analysis suggests that as far as the immediate interests of workers are concerned, it is more imperative to unify the statistical approaches for minimum and average wages in China than to raise the minimum wage standard. In order to achieve the expected effect, simply raising the minimum wage alone is not enough. What is also necessary is to enhance supervision and inspection on compliance by firms with the minimum wage policy, particularly the overtime pay regulations. An alternative is to replace monthly minimum wage with hourly minimum wage.展开更多
文摘交流–电网换相换流器型高压直流输电(AC-line commutated converter high voltage direct current,AC-(LCC)DC)混联系统的电磁暂态初始化在计算模型上可表述为一个扰动的可分无源动力系统。因此,将无源动力系统的显式保积算法应用于电磁暂态初始化计算。采用相空间分析方法,对基于逐次积分法的电磁暂态初始化方法的收敛条件以及收敛速率进行了定量分析。在上述基础上,提出了一类新的、系统化的初始化计算方法,该方法计算格式简单、易于编程,在计算效率上具有明显的优势。算例结果验证了所提方法的有效性。
文摘A new algorithm called the weighted least square discrete parameterization (WLSDP) is presented for the parameterization of triangular meshes over a convex planar region. This algorithm is the linear combination of the discrete Conformal mapping(DCM) and the discrete Authalic mapping(DAM). It provides the good properties of both DCM and DAM, such as robustness and low distortion. By adjusting the scaling factor q embedded in the WLSDP, satisfactory parameterizations in different special applications can be achieved.
基金Supported by the Science and Technology Plan Project of the Educational Department of Shandong Province of China under Grant No.J09LA54the Research Project of"SUST Spring Bud"of Shandong University of Science and Technology of China under Grant No.2009AZZ071
文摘Based on a new discrete three-by-three matrix spectral problem, a hierarchy of integrable lattice equations with three potentials is proposed through discrete zero-curvature representation, and the resulting integrable lattice equation reduces to the classical Toda lattice equation. It is shown that the hierarchy possesses a HamiItonian structure and a hereditary recursion operator. Finally, infinitely many conservation laws of corresponding lattice systems are obtained by a direct way.
文摘First mirrors are the facing components of plasma optical diagnostics system for superconductivity and other fusion devices. Due to high level of neutron and gamma radiation, the lifetime and optical state of first mirror will face an enormous challenge. The degradation of the optical character on the mirror surface mainly comes from the two opposite processes, one is erosion, the other is re-deposition. Which proces plays more important role need testing in present machines. Before 2001 the experimental studies mainly put on material character simulation in a laboratory. Recently, the sample of the first mirror has been investigated in actual fusion device and modification of mirror optical properties was made. But how to protect mirror and make the lifetime longer will be an issue need solving urgently.
基金the Youth Program of the National Philosophical and Social Sciences Foundation "An Empirical Study on the Employment Effect and Income Distribution Effect of Minimum Wage Regulations"(Grant No.12CJY018)sponsored by the major programs of philosophical and social sciences research under the Ministry of Education "A Study on Raising the Ratio of Household Income to National Income"+1 种基金the International Development Research Center(IDRC)of Canadathe Priority Academic Program Development of Jiangsu Higher Education Institutions(PAPD)
文摘It is generally believed in existing literature that China＇s minimum wage is too low and must be raised substantially. Such a view is highly misleading given the inconsistent statistical standards for minimum and average wages. In order to ensure comparability, this paper has adjusted the statistical scope for minimum and average wages respectively. If employees of urban private and self-employed businesses are included in calculating the average wage, the minimum-to-average wage ratio will increase by about 0.06; if the minimum wage standards of various localities include personal contributions to social insurance and the housing fund, the minimum-to-average wage ratio will increase by 0.008; if overtime pay is deducted from the average wage, the minimum-to-average wage ratio will further increase by around O. 06.In addition, if the median wage is used in place of the average wage, the minimum-to-average wage ratio will increase by at least 0.08. After these adjustments, China＇s minimum-to-average wage ratio for 2013 will increase from 0.28 to 0.49, which is within the range of between 0.40 and 0.60 that is recognized internationally as reasonable. Our analysis suggests that as far as the immediate interests of workers are concerned, it is more imperative to unify the statistical approaches for minimum and average wages in China than to raise the minimum wage standard. In order to achieve the expected effect, simply raising the minimum wage alone is not enough. What is also necessary is to enhance supervision and inspection on compliance by firms with the minimum wage policy, particularly the overtime pay regulations. An alternative is to replace monthly minimum wage with hourly minimum wage.
