立足于一个2×2谱问题获得了3×3 Lenard算子对(K,J),并由此导出一类非平凡的(1+1)维孤子方程组.为研究其结构,通过定义新的Lenard递推序列{Gj}得到了该等谱方程组的2×2 Lenard算子对(K,J),进而证明了此孤子族具有Bi-Hamilton结构且在Liouville意义下可积.
The research on the mechanism simulation and display of mass concrete crack based on the visual simulation technology in large-scale water conservancy and hydropower engineering has gotten more and more attention.In this paper,the researches about three-dimensional modeling method of cracks at home and abroad are analyzed.Then,based on the statistical data of mass concrete cracks,using NURBS software platform,the topological relation of three-dimensional crack model for water conservancy and hydropower engineering with complicated dam conditions and gallery groups is established.In order to realize the dam structure cracks in virtual reality system for a target,the application of the simulation of dam crack control,visual query and comprehensive analysis and so on are finished.Finally,the three-dimensional model and visual analysis are applied to simulating crack structure in the actual water conservancy engineering.This can provide a reference for the application of three-dimensional crack visualization based on virtual reality in other engineering fields.
Reading activities with multiple values.Reading is the basic function of access to information.The personal reading meaning include improving knowledge,becoming wisdom,making the mood happy and self-cultivation achieve greatness,etc.The social effect of the reading include cultural inheritance educate citizens,development intelligence source,promote innovation,boost production,etc.
Engineering graduate's innovative ability is the key aspects of the engineering graduate education in university. However,many universities have many problems on the education of engineering graduate students,such as innovative concept behind a lack of teachers,lack of education and guidance way,less innovation platform. In this paper,I analysis the problems and propose a path of transfer concepts,mentioning teachers,tower platform,excellent institutional improvement,which is expect to provide a reference for universities to strengthen engineering graduate's innovative ability.
In order to ensure reliable water for residents,and achieve the purpose of energy-efficient,economical and practical to a certain extent,a water supplying system with variable frequency and constant pressure based on PLC is designed through using PLC as the master controller and with the frequency converter.Using an incremental PID algorithm,by theoretical analysis of constant pressure water supply system,the system determines the appropriate design and control strategy,and uses STEP 7-MICRO/WIN V3.2 programming software to program in S7-200 PLC environment.Further,by frequency control,the system completes the control of the motor speed and realizes the design of the water supply system.Thus,the system not only replaces the towers,high water tank and the traditional water supply device with pressure tank,but saves energy and has the complete protection of function besides stable and reliable.It can be widely applied in various fields of production life.
