The theory of three-dimensional deformation is used.Based on rigid plastic assumption, the theory of stick friction and the sheet crown curve at the entry and the exit are used. The mathematical analytical formula of ...The theory of three-dimensional deformation is used.Based on rigid plastic assumption, the theory of stick friction and the sheet crown curve at the entry and the exit are used. The mathematical analytical formula of the rolling force in lateral distribution is deriven.展开更多
In this paper we study the problem of explicit representation and convergence of Pal type （0;1） interpolation and its converse, with some additional conditions, on the non-uniformly distributed nodes on the unit cir...In this paper we study the problem of explicit representation and convergence of Pal type （0;1） interpolation and its converse, with some additional conditions, on the non-uniformly distributed nodes on the unit circle obtaIned by projecting the interlaced zeros of Pn （x） and Pn′ （x） on the unit circle. The motivation to this problem can be traced to the recent studies on the regularity of Birkhoff interpolation and Pal type interpolations on non-uniformly distributed zeros on the unit circle.展开更多
The distributions of local structural units of calcium silicate melts were quantified by means of classical molecular dynamics simulation and a newly constructed structural thermodynamic model. The distribution of fiv...The distributions of local structural units of calcium silicate melts were quantified by means of classical molecular dynamics simulation and a newly constructed structural thermodynamic model. The distribution of five kinds of Si-O tetrahedra Qi from these two methods was compared with each other and also with the experimental Raman spectra, an excellent agreement was achieved. These not only displayed the panorama distribution of microstructural units in the whole composition range, but also proved that the thermodynamic model is suitable for the utilization as the subsequent application model of spectral experiments for the thermodynamic calculation. Meanwhile, the five refined regions mastered by different disproportionating reactions were obtained. Finally, the distributions of two kinds of connections between Qi were obtained, denoted as Qi-Ca-Qj and Qi-[Ob]-Qj, from the thermodynamic model, and a theoretical verification was given that the dominant connections for any composition are equivalent connections.展开更多
为充分发挥主动配电网提高电力系统灵活性和消纳可再生能源的潜力,该文提出一种计及综合能源系统(integrated energy system,IES)动态特性的主动配电网与输电网协同机组组合模型。一方面引入电-气-热综合能源系统实现多能耦合,使主动配...为充分发挥主动配电网提高电力系统灵活性和消纳可再生能源的潜力,该文提出一种计及综合能源系统(integrated energy system,IES)动态特性的主动配电网与输电网协同机组组合模型。一方面引入电-气-热综合能源系统实现多能耦合,使主动配电网对多能互补的支持融入到输电网的调度优化中;另一方面,为提高调度决策的灵活性,将天然气网与热网的动态特性纳入到输配协同机组组合模型中。基于此模型,根据电-气-热IES多能耦合特性和输-配物理互联特征构建协同优化框架。以联络线交换功率作为耦合变量,将其等效为虚拟能源站,采用目标级联分析法对所提模型进行解耦,从而得到一个独立的输电网优化问题和多个主动配电网局部优化问题。为提高计算效率,采用增量分段方法处理天然气Weymouth方程的非凸性,将该文模型转换为混合整数线性规划问题,保证迭代过程的收敛性,进一步降低计算负担。以T6D2系统和T118D10系统为例,验证所提模型和方法的有效性。展开更多
The 5G radio access network （RAN） architectm＇e is supposed to be split into the central unit （CU） and the distributed unit （DU） in order to support more flexible transport networks and provide enhanced user exp...The 5G radio access network （RAN） architectm＇e is supposed to be split into the central unit （CU） and the distributed unit （DU） in order to support more flexible transport networks and provide enhanced user experience. However, such functional split may also introduce some new technical issues. In this pa- per, we study the data fast retransmission issue introduced by this functional split in different scenarios and solutions are provided to handle this issue. With the fast data retransmis- sion mechanism proposed in this paper, the retransmitted da- ta packets could be identified and handled with high priority. In this way, the data delivery between the CU and DU in 5G RAN is assured.展开更多
Symbol Technologies, Inc., The Enterprise Mobility Company, today announced that it had been selected by ODIN technologies, the leader in the physics of RFID testing, software and deployment, to support its recent con...Symbol Technologies, Inc., The Enterprise Mobility Company, today announced that it had been selected by ODIN technologies, the leader in the physics of RFID testing, software and deployment, to support its recent contract win with the United States Defense Logistics Agency (DLA), the United States Department of Defense’s (DoD) logistics combat support agency that provides supplies and services to America’s military forces worldwide.展开更多
DC microgrids(DCMGs)integrate and coordinate various DC distribution generation units including various renew-able energy sources and battery storage systems,and have been used in satellites,the International Space St...DC microgrids(DCMGs)integrate and coordinate various DC distribution generation units including various renew-able energy sources and battery storage systems,and have been used in satellites,the International Space Station,telecom power stations,computer power supplies,electric aircraft,and electric ships.However,the presence of constant power loads(CPLs)can cause instability in DCMGs.Thus,this paper reviews the stabilization techniques that can resolve instability caused by CPLs,as well as various parameters of CPLs,such as bandwidth,and the frequency of the CPLs that can stabilize the DCMGs.It also discusses recent trends and future work in finding stability limits using the parameters of CPLs.It should be useful for directing research towards appropriate mathematical and experimental approaches for the stability of DCMGs with CPLs.展开更多
文摘The theory of three-dimensional deformation is used.Based on rigid plastic assumption, the theory of stick friction and the sheet crown curve at the entry and the exit are used. The mathematical analytical formula of the rolling force in lateral distribution is deriven.
文摘In this paper we study the problem of explicit representation and convergence of Pal type （0;1） interpolation and its converse, with some additional conditions, on the non-uniformly distributed nodes on the unit circle obtaIned by projecting the interlaced zeros of Pn （x） and Pn′ （x） on the unit circle. The motivation to this problem can be traced to the recent studies on the regularity of Birkhoff interpolation and Pal type interpolations on non-uniformly distributed zeros on the unit circle.
基金Project(2012CB722805)supported by the National Basic Research Program of ChinaProjects(50504010,50974083,51174131,51374141)supported by the National Natural Science Foundation of China+1 种基金Project(50774112)supported by the Joint Fund of NSFC and Baosteel,ChinaProject(07QA4021)supported by the Shanghai"Phosphor"Science Foundation,China
文摘The distributions of local structural units of calcium silicate melts were quantified by means of classical molecular dynamics simulation and a newly constructed structural thermodynamic model. The distribution of five kinds of Si-O tetrahedra Qi from these two methods was compared with each other and also with the experimental Raman spectra, an excellent agreement was achieved. These not only displayed the panorama distribution of microstructural units in the whole composition range, but also proved that the thermodynamic model is suitable for the utilization as the subsequent application model of spectral experiments for the thermodynamic calculation. Meanwhile, the five refined regions mastered by different disproportionating reactions were obtained. Finally, the distributions of two kinds of connections between Qi were obtained, denoted as Qi-Ca-Qj and Qi-[Ob]-Qj, from the thermodynamic model, and a theoretical verification was given that the dominant connections for any composition are equivalent connections.
文摘为充分发挥主动配电网提高电力系统灵活性和消纳可再生能源的潜力,该文提出一种计及综合能源系统(integrated energy system,IES)动态特性的主动配电网与输电网协同机组组合模型。一方面引入电-气-热综合能源系统实现多能耦合,使主动配电网对多能互补的支持融入到输电网的调度优化中;另一方面,为提高调度决策的灵活性,将天然气网与热网的动态特性纳入到输配协同机组组合模型中。基于此模型,根据电-气-热IES多能耦合特性和输-配物理互联特征构建协同优化框架。以联络线交换功率作为耦合变量,将其等效为虚拟能源站,采用目标级联分析法对所提模型进行解耦,从而得到一个独立的输电网优化问题和多个主动配电网局部优化问题。为提高计算效率,采用增量分段方法处理天然气Weymouth方程的非凸性,将该文模型转换为混合整数线性规划问题,保证迭代过程的收敛性,进一步降低计算负担。以T6D2系统和T118D10系统为例,验证所提模型和方法的有效性。
文摘The 5G radio access network （RAN） architectm＇e is supposed to be split into the central unit （CU） and the distributed unit （DU） in order to support more flexible transport networks and provide enhanced user experience. However, such functional split may also introduce some new technical issues. In this pa- per, we study the data fast retransmission issue introduced by this functional split in different scenarios and solutions are provided to handle this issue. With the fast data retransmis- sion mechanism proposed in this paper, the retransmitted da- ta packets could be identified and handled with high priority. In this way, the data delivery between the CU and DU in 5G RAN is assured.
文摘Symbol Technologies, Inc., The Enterprise Mobility Company, today announced that it had been selected by ODIN technologies, the leader in the physics of RFID testing, software and deployment, to support its recent contract win with the United States Defense Logistics Agency (DLA), the United States Department of Defense’s (DoD) logistics combat support agency that provides supplies and services to America’s military forces worldwide.
文摘DC microgrids(DCMGs)integrate and coordinate various DC distribution generation units including various renew-able energy sources and battery storage systems,and have been used in satellites,the International Space Station,telecom power stations,computer power supplies,electric aircraft,and electric ships.However,the presence of constant power loads(CPLs)can cause instability in DCMGs.Thus,this paper reviews the stabilization techniques that can resolve instability caused by CPLs,as well as various parameters of CPLs,such as bandwidth,and the frequency of the CPLs that can stabilize the DCMGs.It also discusses recent trends and future work in finding stability limits using the parameters of CPLs.It should be useful for directing research towards appropriate mathematical and experimental approaches for the stability of DCMGs with CPLs.
