船舶交通系统模拟技术的开发与研究

概述已研发的船舶交通系统模拟仿真技术及其软件包,内容包括船舶交通的数据搜集、数据库建立、系统建模、系统模拟及避碰模型和应用等,并在船舶交通系统建模的基础上,提出一种新的基于航路的船舶交通系统模拟方法,它可将船舶交通实态观测所得数据通过计算机处理确定航路型状。该方法考虑了船舶交通的随机性,可任意修改航路,使模拟结果更加符合客观实际。系统可输出船舶交通密度图、航迹图、门线图以及各种船舶的交通参数。以大连港为例,通过各航道段水域的观测和研究,验证了模拟模型的可信性。

Experimental Fault Detection in Rotation System Using State Observers by LMIs

Rotating systems have many applications in wide-ranging industrial contexts. The breakdown of this equipment results in economic wastes and leads to dangerous situations. To avoid such problems is very important, and it can be done through tools that inform about the existence of faults, as well as, about their progress in time. A review of the modeling process used for rotor-support-structure shows that the finite element method is the maj or method employed. In this paper, with the aid of well defined theoretical models, obtained using the finite element technique, and the state observer method for the identification and location of faults, it is possible to monitor the parameters of a rotor-support-structure system, including the foundation effects. In order to improve safety, these parameters must be supervised in case of the occurrence of failures or faults. The state observers are designed using Linear Matrix Inequalities （LMIs）. Finally, experimental results （using for this a rotation system in the mechanical vibrations laboratory at Ilha Solteira＇s Mechanical Engineering Department） demonstrate the effectiveness of the methodology developed.

Implications of the Z_(cs)(3985) and Z_(cs)(4000) as two different states

Recently,the hidden charm tetraquark states Z_(cs)(3985)and Z_(cs)(4000)with strangeness were observed by the BESⅢ and LHCb collaborations,respectively,which are great breakthroughs for exploring exotic quantum chromodynamics(QCD)structures.The first and foremost question is whether they are the same state.In this work,we explore the implications of the narrower state Z_(cs)(3985)in BESⅢ and the wider one Z_(cs)(4000)in LHCb as two different states.Within a solvable nonrelativistic effective field theory,we include the possible violations of heavy quark spin symmetry and SU(3)flavor symmetry in a comprehensive approach.If Z_(cs)(3985)and Z_(cs)(4000)are two different states,our results show that Z_(cs)(4000)/Z_(cs)(3985)is the pure(|D_(s)^(*)D>+/-|D_(s)D^(*)>)/√2 state,and the SU(3)flavor partner of Zc(3900)is Z_(cs)(4000)rather than the Z_(cs)(3985).Another two important consequences are the existence of a tensor D_(s)^(*)D^(*) resonance with mass about 4126 MeV and width 13 MeV,and the suppression of the decay mode Z_(cs)(3985)J/ψK.The two consequences can be tested in experiments and distinguish the two-state interpretation from the one-state scheme.

Radial Forces in a Centrifugal Compressor; Experimental Investigation by Using Magnetic Bearings and Static Pressure Distribution

The volute of a centrifugal compressor causes a non-uniform pressure distribution which leads to a radial force on the impeller. This force was measured using magnetic bearings. In addition, the radial force was estimated using the static pressure distribution measured at the impeller outlet. The impeller force was found to be the highest at choke, the lowest at the design flow and moderate at stall. The radial force determined from the pressure measurements was only slightly different from the force obtained from the bearing measurements. The rotational speed was seen to affect the force to some extent.

Chiral flux phase in the Kagome superconductor AV_(3)Sb_(5)

We argue that the topological charge density wave phase in the quasi-2D Kagome superconductor AV3Sb5 is a chiral flux phase.Considering the symmetry of the Kagome lattice,we show that the chiral flux phase has the lowest energy among those states which exhibit 2×2 charge orders observed experimentally.This state breaks the time-reversal symmetry and displays anomalous Hall effect.The explicit pattern of the density of state in real space is calculated.These results are supported by recent experiments and suggest that these materials are new platforms to investigate the interplay between topology,superconductivity and electron–electron correlations.