用MS Xα方法研究了Nin(n =2～ 6 )团簇的电子结构和原子磁矩 .与晶体镍相比 ,有些团簇磁性明显增强 ,有些磁性明显减弱 ,有些则呈现出亚铁磁性 .分析发现 ,团簇的对称性对磁矩有着非常重要的影响 .对称性相似的团簇 ,磁矩大小也相仿 .仅有极少数原子的小团簇磁矩与团簇尺寸不存在递减或递增的规律性 .其原因是对于小团簇 ,增减一个原子可以引起对称性的根本变化 .超细微粒表面层由对称性较
The superiorities of air-cooled bainitic steels were described.A series of air-cooled bainitic steels containing manganese were developed and presented,which in
The 10Ni5CrMoV steel examined was a 16 mm thick plate. Specimens measuring 12 mm × 12 mm × 120 mm were thermally cycled using DM-100 A weld simulator with var
With thick plates of 2219 high-strength alloy, the microstructures of welded joints with twin wire MIG welding were analyzed. Experimental results show that no
In E-Commerce, consumers and service suppliers can find the services through the searching of Mobile Agents (MA).The suppliers disassemble the service requests
提出一种鲁棒重复控制方法用来提高无刷直流电机驱动测试转台的速率平稳性.该方法以互补的方式综合了变结构控制律和重复控制律.变结构控制律可以有效地镇定系统,并抑制非周
提出了基于虚拟仪器技术的晶闸管电路测试方法,为解决晶闸管装置应用中的功率因数低和产生高次谐波两个主要问题提供了依据.介绍了在LabVIEW平台上开发的晶闸管电路测试系统
For OFDM systems with hundreds or thousands subcarriers with the adaptive bit and power loading according to each subcarrier, the signaling overhead will be awf
According to the analysis of meteor burst communication (MBC) mechanism, a model of signal processing based on the structure of data frame is suggested for adap
It is difficult to treat 2-amino-thiazoline-4-carboxylic acid (ATC) waste liquid effectively at present for its characteristics of high chemical oxygen demand (