关于Wakamatsu倾斜模的Gorenstein类的稳定性

利用同调代数的方法,研究了关于Wakamatsu倾斜模的Gorenstein类的稳定性,并证明了对任意整数n≥1都有(gi_ω)~(n+1)=(gi_ω)~n.     

Endsk(2,5)(Ω5k)与Enduk(2,5)(Ω5k)的结构

利用张量空间Ω5k作为glk(2)量子包络代数(q Schur代数)的tilting模分解以及在n=2时已知的tilting模结构,给出Ω5k作为无穷小q Schur代数及小q Schur代数的模时 Endsk(2,5)(Ω5k)与Enduk(2,5)(Ω5k) 的维数、一组生成元以及主模分解.     

π-凝聚环上的余*-模和余tilting模

主要引入了π－凝聚环上的余＊－模和余tilting模的概念，得到了余＊－模的3个刻划，并且利用余＊－模给出了π－凝聚环上余tilting模的特征性质，从而推广了文献（Science in China,1995.39(1)：1709－1728.）中的结果。     

End_(s_k(2,5))(Ω_k~(5))与End_(u_k(2,5))(Ω_k~(5))的结构

利用张量空间Ω_k~(5)作为gl_k(2)量子包络代数(q-Schur代数)的tilting模分解以及在n=2时已知的tilting模结构,给出Ω_k~(5)作为无穷小q-Schur代数及小q-Schur代数的模时End_(s_k(2,5))(Ω_k~(5))与End_(u_k(2,5))(Ω_k~(5))的维数、一组生成元以及主模分解.     

Ag膜的取向测定

利用不对称布拉格反射STD（sample tilting diffraction）扫描模式与常规CBD（conventional Bragg diffraction）扫描模式,确定Ag膜的结构及取向。     

Motion Analysis of Fiber Band in Compact Field of Compact Spinning

The technological process of compact spinning and the compact procedure of fiber band in compact field are briefly illustrated. The motions of fiber band in compact field are discussed theoretically from which tilting angle of suction slot in profile tube, additional twists created by fiber band＇s rotating around its own axis and ultimate twists in compact yarn are deduced accordingly. The existence of additional twists is also verified through experiments.     

单点扩张代数的表示维数

设A是一个表示无限型的Artin代数,M是一个左A模,Λ是A通过M得到的单点扩张代数。如果Fac(M)是tilting torsion类,且M是A的某个Auslander生成子的直和项,那么Λ的表示维数不超过A的表示维数,与A的整体维数加2两者的最大值。若M是APR-tilting模或者是BB-tilting模的投射部分,可以证明上述结论对由这两类模所得的单点扩张代数亦成立。     

多频段远程电调倾角天线控制器设计

提出一种符合AISG2.0协议规范的多频段远程电调天线(multi-band remote electronic tilting antenna,MRE-TA)嵌入式控制器解决方案.根据AISG2.0协议物理层的规范要求,设计了一款基于分离元器件的OOK(on-offkeying)调制和解调电路,详细阐述了调节其接收灵敏度和输出功率的方法与工作原理;分析了MRETA中浪涌电流的特点,设计了一种在反复上电、断电情况下仍能满足协议规范及基站系统要求的浪涌电流抑制电路;给出了带位置反馈的多频段移相器下倾角闭环控制模块的硬件设计思路;介绍了AISG2.0协议栈及下倾角控制模块的软件实现方法;最后给出了该设计方案电气性能及协议互操作的测试结果.测试和实际应用证明,该设计方案的硬件性能和协议完整性完全符合AISG2.0规范要求,并具有互操作兼容性好、长期运行稳定可靠的优点.     

Microstructure Study of Ti-24Al-14Nb-3V Alloy

The microstructure of Ti-24Al-14NB-3V intermetallic alloy with solution treated was investigated by trans mission electron microscopy (TEM) and selected area electron diffraction (SAD) in conjunction with X-ray energy dispersive spectroscopy (EDS) techniques. It shown that φ=50% ductile β₀-phase and small amount of O phase,and α₂ with the number of dislocations having c-component resulted in increasing slip system of the material, have contributed to a good combination of strength and ductility at room temperature. Owing to some reciprocal planes of similarity between α₂ and O Phases, to distinguish both of two phases, a series of diffraction patterns obtained by tilting around one reciprocal direction of the phase are needed based on the systematic extinction and reciprocal planes sequences occurred in the diffraction patterns, if those patterns are not containing one of three reciprocal unit vectors, a*, b*, c* in terms of the crystal unit cell, a, b, c.     

An experiment study of lee vortex with large topography forcing

This paper, relates the lee vortex which is triggered when the rotating and stratified flow passes over the large obstacle by using towing tank and based on the similarity. The results show that Froude number Fr is the most important parameter, and, in the rotating case, the lee vortex is easily triggered, because the rotating may, on one hand,lead to downward flow, on the other hand, induce lee vortex through generating geostrophic vorticity. Even in the non-rotating case, the lee vortex can be still formed, as long as both Froude number Fr and stratification parameter N are appropriate. For the formation mechanism of the lee vortex, there are obvious differences in the rotating case compared with the non-rotating case. In the non-rotating case, the tilting term of the perturbation vorticity is a dominant factor of inducing the lee vortex. However, in the rotating case, effect and the convergence of perturbation vorticity are dominant factors.