共查询到19条相似文献,搜索用时 46 毫秒
1.
本文讨论了一类线性算子的本征值相应的投影算于的特性,给出了这类线性算子的本征向量空间与投影空间之间的关系及其维数特性。 相似文献
2.
文章用有限差分理论获得场的差分方程组的通用矩阵形式,分析了脊位于窄边的单脊波导本征值问题,获得了脊位于窄边的单脊波导的截止波长一系列数据,对脊波导器件的应用有一定的实际意义。 相似文献
3.
对真空包围可含边界空穴的有界介质(可以不凸)证明了相应中子迁移算子占优本征值的存在性及严格占优性。 相似文献
4.
5.
6.
通过对SU(n)Hubbard可积模型的研究,求出该模型的能量本征值.用可积模型中的坐标Bethe Ansatz的方法,首先由薛定谔方程求得能量的本征方程,设定波函数的具体形式,求出本征能量,SU(n)Hubbard可积模型的本征能量可通过Bethe Ansatz的方法求得。 相似文献
7.
8.
9.
10.
对于s态的双曲正切势场下的Schr(o)dinger的径向方程,则能精确求出能量本征值和对应的波函数的表达式.对于非零的l态,则不能精确求解双曲势场下的在Schr(o)dinger的径向方程.本文针对不能精确求解非零的l态,从另一方面出发,能利用近似的方法得到能量本征值和对应的本征函数的表达式.应用类似的Pekeris近似方法,将含有角动量的一项在r0处展开,省略高阶项,原双曲正切势场Schr(o)dinger的径向方程变化成为超几何方程.应用超几何级数方法,得到了能量本征值和对应的本征函数的表达式.最后进行数值的验算,取两组不同的数值来计算能量本征值,得出结果基本一致,数值结果表明此法是可靠和有效的. 相似文献
11.
An energy method for calculations in fabric mechanics is described. The aim behind the development of this method was to find an approach that could be applied in a uniform manner to a variety of fabric structures and types of deformation. In the first part of the paper, the principle of the method is described for the simplest case: that in which the fabric structure acts only as a load-bearing mechanism, whose changes in internal energy during deformation are negligible compared with changes in potential energy due to externally applied loads. In the second part, the method is extended to include the effects of strain energy in the component fibres and yarns. 相似文献
12.
13.
In the preceding paper, an energy method for performing calculations in fabric mechanics, together with appropriate computational techniques, was described. The present paper contains examples of applications of this method to woven fabrics, particularly to various models of plainweave fabric subject to tension, but also briefly to fabric-bending and to other weaves. 相似文献
14.
设A是复Hilbert空间X上的有界线性算子,任意λ∈C,如果存在X上的非零有界线性算子B使得AB=λBA,那么就称λ是A的一个广义特征值.记A的全体广义特征值所构成的集合为∑(A).利用算子分块的技巧,讨论了上三角算子矩阵的广义特征值的稳定性问题.此外,对X上的正可逆算子A,证得∑(A^n/m)=(∑(A))n/m,其中n,m∈Z,并且m≠0. 相似文献
15.
用静水力学法无拆卸评价镶圆钻首饰金属成色(密度)的可行性分析 总被引:1,自引:0,他引:1
统计分析表明,目前市场上钻石绝大部分<0.42ct,钻石戒指主要在1.5~3.6g之间,钻戒比则一般不超过3.2%,并且钻重和戒重之间有较好的线性关系。在此基础上,根据对圆钻体积和重量公式的推导结果,提出对镶单圆钻首饰的镀金重量及成色(密度)用静水力学法进行估测是可行的,金属重量的误差不超过0.01g,密度相对误差不超过1.2%。给出了测算步骤,并指出本法对其它具圆钻切工的宝石也是适用的。 相似文献
16.
17.
18.
用玻璃毛细管柱代替不锈钢填充柱在色谱仪上进行二甘醇含量测定,可以克服原不锈钢柱存在的吸附、不稳定现象,提高分析的稳定性及准确度。 相似文献
19.
J. J. Thwaites 《纺织学会志》2013,104(3):116-138
An analysis is given from which equations can be derived that relate the variations of twist factor, tension, and yam path through a false-twist friction spindle. The solution of these (differential) equations leads to predictions about the dependence of over-all twist factor and tension ratio on, among other parameters, the ratio of yam speed to spindle speed, the angle of wrap, and the input tension. These are compared with the early experimental results of Arthur and Weller and with more recent results. The equations also yield the variation of twist factor and tension over the spindle surface and could be used to estimate wear. The early part of the analysis would have general application in any situation in which a yarn is moving over a surface. 相似文献