我国稀土永磁行业发展面临的主要问题及建议

我国稀土永磁行业在短短半个世纪的发展历程中,取得了令世人瞩目的非凡成就,不可说不是全球磁材行业变革的一大奇迹。但需要注意的是,伴随飞速发展的同时,我国永磁行业发展面临着七大严峻问题,影响着我国稀土永磁业的进一步发展。正是基于这点考虑,本文指出我国永磁行业发展面临的主要问题,并为永磁企业的发展提出两点建议——产业整合和在市场与技术开发上争取主动。     

报表封面封底预审心得

1引言 随着气象业务自动化进程的日趋推进，机审已大大减轻了预审员的工作任务。但由于0SSM02004软件下审核程序的不完善，有些错误记录机审单仍不能完全反映，报表的审核仍需要机审与人工审核相辅相成，封面、封底作为手动输入项目成为了人工审核的重点。本文中笔者根据学习及工作体会谈谈几点心得。     

我国稀土永磁产业发展与现状

由于上游产业的带动,我国的稀土永磁材料发展速度很快,其中Sm-Co永磁增长缓慢,NdFeB永磁材料以其优良的性价比获得了高速增长,并改变了稀土永磁产业的产业结构。本文从稀土永磁材料市场的供给和消费两个方面,对我国NdFeB产业的发展现状进行了综合评述。     

知识创新随机过程最大熵模型

根据创新知识的形成受已有相关知识影响的假设，综合运用概率统计、最优化、最大熵原理构建了知识创新随机过程最大熵模型，给出了以已有知识x∈X为约束的新知识y∈Y的条件概率p(y|x)。模型具有随机性与因果性对立统一的特点。     

Influence of impurity seeding on the plasma radiation in the EAST tokamak

Plasma radiation characteristics in EAST argon(Ar) gas and neon(Ne) gas seeding experiments are studied.The radiation profiles reconstructed from the fast bolometer measurement data by tomography method are compared with the ones got from the simulation program based on corona model.And the simulation results coincide roughly with the experimental data.For Ar seeding discharges,the substantial enhanced radiations can be generally observed in the edge areas at normalized radius ρ_(pol)~0.7–0.9,while the enhanced regions are more outer for Ne seeding discharges.The influence of seeded Ar gas on the core radiation is related to the injected position.In discharges with LSN divertor configuration,the Ar ions can permeate into the core region more easily when being injected from the opposite upper divertor ports.In USN divertor configuration,the W impurity sputtered from the upper divertor target plates are observed to be an important contributor to the increase of the core radiation no matter impurity seeding from any ports.The maximum radiated power fractions f_(rad)(P_(rad)/P_(heat)) about 60%–70% have been achieved in the recent EAST experimental campaign in 2015–2016.