排序方式： 共有33条查询结果，搜索用时 15 毫秒
31.
研究了马尾松枝桠材中的应压木和对应木的化学、物理及力学性质．并与正常干材对比。结果表明：它们在化学组分、纤维素相对结晶度、密度、胀缩性、吸水性、顺纹抗压、抗弯强度及其弹性模量等方面存在明显的差异。 相似文献
32.
研究了求解线性系统的神经网络算法，提出并证明了神经网络算法的收敛性定理,该算法不涉及矩阵的逆运算和除法运算，不受条件αii≠0的限制，对于严重病态的线性系统也能得到高精度解．给出的应用实例验证了算法的有效性． 相似文献
33.
In this paper,the analytical solutions for an elastic rectangular thin plate with opposite boundary completely clamped support and others free were derived by a Symplectic geometry method.Due to the fact that the basic elasticity equations of the thin plate were only used,it was not necessary to select the deformation function arbitrarily.Therefore,the solutions in this paper are much more general mathematically.In order to prove the validity of the formulations,numericam results were presented to be compared with those derived by other references. 相似文献