This paper explores the convergence of a class of optimally conditioned self scaling variable metric (OCSSVM) methods for unconstrained optimization. We show that this class of methods with Wolfe line search are glob...This paper explores the convergence of a class of optimally conditioned self scaling variable metric (OCSSVM) methods for unconstrained optimization. We show that this class of methods with Wolfe line search are globally convergent for general convex functions.展开更多
Due to the phenomenon of abandoning wind power and photo voltage(PV)power in the“Three Northern Areas”in China,this paper presents an optimal strategy for coordinating and dispatching“source-load”in power system b...Due to the phenomenon of abandoning wind power and photo voltage(PV)power in the“Three Northern Areas”in China,this paper presents an optimal strategy for coordinating and dispatching“source-load”in power system based on multiple time scales.On the basis of the analysis of the uncertainty of wind power and PV power as well as the characteristics of load side resource dispatching,the optimal model of coordinating and dispatching“source-load”in power system based on multiple time scales is established.It can simultaneously and effectively dispatch conventional generators,wind plant,PV power station,pumped-storage power station and load side resources by optimally using three time scales:day-ahead,intra-day and real-time.According to the latest predicted information of wind power,PV power and load,the original generation schedule can be rolled and amended by using the corresponding time scale.The effectiveness of the model can be verified by a real system.The simulation results show that the proposed model can make full use of“source-load”resources to improve the ability to consume wind power and PV power of the grid-connected system.展开更多
An approach based on multi-scale ehirplet sparse signal decomposition is proposed to separate the malti-component polynomial phase signals, and estimate their instantaneous frequencies. In this paper, we have generate...An approach based on multi-scale ehirplet sparse signal decomposition is proposed to separate the malti-component polynomial phase signals, and estimate their instantaneous frequencies. In this paper, we have generated a family of multi-scale chirplet functions which provide good local correlations of chirps over shorter time interval. At every decomposition stage, we build the so-called family of chirplets and our idea is to use a structured algorithm which exploits information in the family to chain chirplets together adaptively as to form the polyncmial phase signal component whose correlation with the current residue signal is largest. Simultaueously, the polynomial instantaneous frequency is estimated by connecting the linear frequency of the chirplet functions adopted in the current separation. Simulation experiment demonstrated that this method can separate the camponents of the multi-component polynamial phase signals effectively even in the low signal-to-noise ratio condition, and estimate its instantaneous frequency accurately.展开更多
A vast number of researches and studies have been conducted on narcissism, since the term was used to explain a psychological phenomenon in 1898. However, the discussions about narcissists as organization members or l...A vast number of researches and studies have been conducted on narcissism, since the term was used to explain a psychological phenomenon in 1898. However, the discussions about narcissists as organization members or leaders have recently become a research topic in the organizational sciences. In this scope, the recent research on narcissism indicates that narcissistic leaders can either cause organizational tragedies or contribute to organizational success by their great vision. In addition to narcissism, another popular leadership feature is political skill which has attracted considerable attentions in recent years, and become one of the important topics of management studies. Moreover, political skill has been asserted to be a positive characteristic which is related to develop vision and team insight as well as to increase in members＇ trust and support; whereas narcissism has both harmful and beneficial effects on organizations. In this study, the relationships between the dimensions of narcissism and political skill are examined via the 16-item Narcissistic Personality Inventory （NPI） and the 18-item Political Skill Inventory. Analysis has shown that the authority, which is the adaptive dimension of narcissism, correlates positively with social astuteness and networking ability dimensions of political skill. Accordingly entitlement, which is one of the maladaptive dimensions of narcissism, correlates significantly and negatively with the networking ability, interpersonal influence and apparent sincerity dimensions of political skill. When political skill is considered as a composite score, the findings indicate that the authority dimension of narcissism has a positive effect whereas, the entitlement dimension has a negative effect on political skill. Besides, implications for future studies are discussed展开更多
Objective： To study the stress distribution of the femoral hip prosthesis after the hip joint replacement. Methods： After the hip joint replacement, when the fenmr and prosthesis are considered as concentric cylinde...Objective： To study the stress distribution of the femoral hip prosthesis after the hip joint replacement. Methods： After the hip joint replacement, when the fenmr and prosthesis are considered as concentric cylinders with perfectly banded interface, a relatively perfect theoretical model of simulating the interracial stress transfer is established. Results： The maximum interfaeial shear stress oeeured at Z=O. At the cross-section of the femoral neck, interfacial shear stress decreased exponentially with the increases of the Z. Shear stress became very small at Z〉0. 1 m, which meant that the shear stress at the far end of the femoral hip prosthesis was very small. In order to avoid the stress concentration and femoral hip prosthesis sinking, interracial stress must remain constant and balanced with the pressure load at Z=O. The radius of the femoral hip prosthesis changed with interfacial shear stress. The maximum value of the radius occured at Z=O, then it decreased at m. Specially, a=18.2 mm at Z=10 ram, a=5.36 mm at Z=98 ram, these are ideal radius. Conclusion： A theoretical model of simulating the interfacial stress is established when the femur and prosthesis are considered as concentric cylinders. The distributions of the interfacial shear and radial stresses with the axial positions are obtained. A theoretical reference for the design of the prosthesis is provided.展开更多
This paper is of conceptual nature. The considerations are based on literature studies and empirical research carried out in 2009 and 2011 among the members of supervisory board in Polish public companies. The purpose...This paper is of conceptual nature. The considerations are based on literature studies and empirical research carried out in 2009 and 2011 among the members of supervisory board in Polish public companies. The purpose of this article is to present a new business reporting model extended by the supervisory board＇s reports. The part of this article, which is based on the literature research, clarifies the scope of modem business reporting, being a part of a company＇s information system. This article includes management commentary proposal prepared by the International Accounting Standards Board （IASB）. The authors proposed a supplement to the management commentary which is a global model of disclosures accompanying financial statements. According to the concept presented in this article, information prepared and disclosed by managers in financial statements and management commentaries are parts of a larger reporting system-corporate reporting supply chain. This paper mainly proposes an extension of a modem company＇s information system with a new channel of communication, such as supervisory board＇s reports. This article explains the role of a supervisory board associated with the conception. In the prepared conception, supervisory board becomes an active reviewer of management action. Moreover, it is also an active participant in the chain of corporate reports. Deliberations presented in this article are the voices in the debate on the shape of the modem business reporting.展开更多
Post-transcriptional modifications,including histone modifications and DNA methylation,alter the chromatin landscape to regulate gene expression,thus control various cellular processes in plants.EARLY FLOWERING IN SHO...Post-transcriptional modifications,including histone modifications and DNA methylation,alter the chromatin landscape to regulate gene expression,thus control various cellular processes in plants.EARLY FLOWERING IN SHORT DAYS(EFS)is the major contributor for H3K36 methylation in Arabidopsis and is important for plant development.Here,we find that EFS is expressed in different stages of embryo morphogenesis,and the efs mutant produces larger embryo that results in enlarged seeds.Further analysis reveals that an imprinted gene MOP9.5 is hypomethylated at the promoter region and its expression is derepressed in efs mutant.MOP9.5 promoter is marked by various epigenetic modifications,and we find that following the increase of H3K36me3,H3K27me3 and H3K9me2 levels are reduced in efs mutant.This data indicates an antagonistic regulation between H3K36me3 and DNA methylation,and/or H3K27me3 at MOP9.5.Our results further show that both maternal and paternal EFS alleles are responsible for the seed size regulation,which unraveled a novel function of EFS in plant development.展开更多
Adequate energy storage is essential for sustaining healthy life. Lipid droplet （LD） is the subcellular organelle that stores energy in the form of neutral lipids and releases fatty acids under energy deficient cond...Adequate energy storage is essential for sustaining healthy life. Lipid droplet （LD） is the subcellular organelle that stores energy in the form of neutral lipids and releases fatty acids under energy deficient conditions. Energy storage capacity of LDs is primarily dependent on the sizes of LDs. Enlargement and growth of LDs is controlled by two molecular pathways： neutral lipid synthesis and atypical LD fusion. Shrinkage of LDs is mediated by the degradation of neutral lipids under energy demanding conditions and is controlled by neutral cytosolic lipases and lysosomal acidic lipases. In this review, we summarize recent progress regarding the regulatory pathways and molecular mechanisms that control the sizes and the energy storage capacity of LDs.展开更多
文摘This paper explores the convergence of a class of optimally conditioned self scaling variable metric (OCSSVM) methods for unconstrained optimization. We show that this class of methods with Wolfe line search are globally convergent for general convex functions.
基金Major Projects of Gansu Province(No.17ZD2GA010)Power Company Technology Projects of State Grid Corporation in Gansu Province(No.52272716000K)
文摘Due to the phenomenon of abandoning wind power and photo voltage(PV)power in the“Three Northern Areas”in China,this paper presents an optimal strategy for coordinating and dispatching“source-load”in power system based on multiple time scales.On the basis of the analysis of the uncertainty of wind power and PV power as well as the characteristics of load side resource dispatching,the optimal model of coordinating and dispatching“source-load”in power system based on multiple time scales is established.It can simultaneously and effectively dispatch conventional generators,wind plant,PV power station,pumped-storage power station and load side resources by optimally using three time scales:day-ahead,intra-day and real-time.According to the latest predicted information of wind power,PV power and load,the original generation schedule can be rolled and amended by using the corresponding time scale.The effectiveness of the model can be verified by a real system.The simulation results show that the proposed model can make full use of“source-load”resources to improve the ability to consume wind power and PV power of the grid-connected system.
基金supported by the National Science Foundation of China(No.50875078)
文摘An approach based on multi-scale ehirplet sparse signal decomposition is proposed to separate the malti-component polynomial phase signals, and estimate their instantaneous frequencies. In this paper, we have generated a family of multi-scale chirplet functions which provide good local correlations of chirps over shorter time interval. At every decomposition stage, we build the so-called family of chirplets and our idea is to use a structured algorithm which exploits information in the family to chain chirplets together adaptively as to form the polyncmial phase signal component whose correlation with the current residue signal is largest. Simultaueously, the polynomial instantaneous frequency is estimated by connecting the linear frequency of the chirplet functions adopted in the current separation. Simulation experiment demonstrated that this method can separate the camponents of the multi-component polynamial phase signals effectively even in the low signal-to-noise ratio condition, and estimate its instantaneous frequency accurately.
文摘A vast number of researches and studies have been conducted on narcissism, since the term was used to explain a psychological phenomenon in 1898. However, the discussions about narcissists as organization members or leaders have recently become a research topic in the organizational sciences. In this scope, the recent research on narcissism indicates that narcissistic leaders can either cause organizational tragedies or contribute to organizational success by their great vision. In addition to narcissism, another popular leadership feature is political skill which has attracted considerable attentions in recent years, and become one of the important topics of management studies. Moreover, political skill has been asserted to be a positive characteristic which is related to develop vision and team insight as well as to increase in members＇ trust and support; whereas narcissism has both harmful and beneficial effects on organizations. In this study, the relationships between the dimensions of narcissism and political skill are examined via the 16-item Narcissistic Personality Inventory （NPI） and the 18-item Political Skill Inventory. Analysis has shown that the authority, which is the adaptive dimension of narcissism, correlates positively with social astuteness and networking ability dimensions of political skill. Accordingly entitlement, which is one of the maladaptive dimensions of narcissism, correlates significantly and negatively with the networking ability, interpersonal influence and apparent sincerity dimensions of political skill. When political skill is considered as a composite score, the findings indicate that the authority dimension of narcissism has a positive effect whereas, the entitlement dimension has a negative effect on political skill. Besides, implications for future studies are discussed
文摘Objective： To study the stress distribution of the femoral hip prosthesis after the hip joint replacement. Methods： After the hip joint replacement, when the fenmr and prosthesis are considered as concentric cylinders with perfectly banded interface, a relatively perfect theoretical model of simulating the interracial stress transfer is established. Results： The maximum interfaeial shear stress oeeured at Z=O. At the cross-section of the femoral neck, interfacial shear stress decreased exponentially with the increases of the Z. Shear stress became very small at Z〉0. 1 m, which meant that the shear stress at the far end of the femoral hip prosthesis was very small. In order to avoid the stress concentration and femoral hip prosthesis sinking, interracial stress must remain constant and balanced with the pressure load at Z=O. The radius of the femoral hip prosthesis changed with interfacial shear stress. The maximum value of the radius occured at Z=O, then it decreased at m. Specially, a=18.2 mm at Z=10 ram, a=5.36 mm at Z=98 ram, these are ideal radius. Conclusion： A theoretical model of simulating the interfacial stress is established when the femur and prosthesis are considered as concentric cylinders. The distributions of the interfacial shear and radial stresses with the axial positions are obtained. A theoretical reference for the design of the prosthesis is provided.
文摘This paper is of conceptual nature. The considerations are based on literature studies and empirical research carried out in 2009 and 2011 among the members of supervisory board in Polish public companies. The purpose of this article is to present a new business reporting model extended by the supervisory board＇s reports. The part of this article, which is based on the literature research, clarifies the scope of modem business reporting, being a part of a company＇s information system. This article includes management commentary proposal prepared by the International Accounting Standards Board （IASB）. The authors proposed a supplement to the management commentary which is a global model of disclosures accompanying financial statements. According to the concept presented in this article, information prepared and disclosed by managers in financial statements and management commentaries are parts of a larger reporting system-corporate reporting supply chain. This paper mainly proposes an extension of a modem company＇s information system with a new channel of communication, such as supervisory board＇s reports. This article explains the role of a supervisory board associated with the conception. In the prepared conception, supervisory board becomes an active reviewer of management action. Moreover, it is also an active participant in the chain of corporate reports. Deliberations presented in this article are the voices in the debate on the shape of the modem business reporting.
基金supported by National Key R&D Program (2016YFA0500800)the National Natural Science Foundation of China (31571322)+2 种基金Tsinghua-Peking Joint Center for Life Sciences1000 Young Talent Program of ChinaS.Shafiq and Wei Xu are supported by the postdoctoral fellowships from Tsinghua-Peking Joint Center for Life Sciences
文摘Post-transcriptional modifications,including histone modifications and DNA methylation,alter the chromatin landscape to regulate gene expression,thus control various cellular processes in plants.EARLY FLOWERING IN SHORT DAYS(EFS)is the major contributor for H3K36 methylation in Arabidopsis and is important for plant development.Here,we find that EFS is expressed in different stages of embryo morphogenesis,and the efs mutant produces larger embryo that results in enlarged seeds.Further analysis reveals that an imprinted gene MOP9.5 is hypomethylated at the promoter region and its expression is derepressed in efs mutant.MOP9.5 promoter is marked by various epigenetic modifications,and we find that following the increase of H3K36me3,H3K27me3 and H3K9me2 levels are reduced in efs mutant.This data indicates an antagonistic regulation between H3K36me3 and DNA methylation,and/or H3K27me3 at MOP9.5.Our results further show that both maternal and paternal EFS alleles are responsible for the seed size regulation,which unraveled a novel function of EFS in plant development.
基金supported by the National Natural Science Foundation of China(31420040,31321003 to Peng Li,31501089 to Jinhai Yu)the National Basic Research Program(2013CB530602 to Peng Li)the China Postdoctoral Science Foundation(2015M581079 to Jinhai Yu)
文摘Adequate energy storage is essential for sustaining healthy life. Lipid droplet （LD） is the subcellular organelle that stores energy in the form of neutral lipids and releases fatty acids under energy deficient conditions. Energy storage capacity of LDs is primarily dependent on the sizes of LDs. Enlargement and growth of LDs is controlled by two molecular pathways： neutral lipid synthesis and atypical LD fusion. Shrinkage of LDs is mediated by the degradation of neutral lipids under energy demanding conditions and is controlled by neutral cytosolic lipases and lysosomal acidic lipases. In this review, we summarize recent progress regarding the regulatory pathways and molecular mechanisms that control the sizes and the energy storage capacity of LDs.
