刚性链嵌段共聚物的研究（Ⅳ）—聚醚醚酮／苯酞圈型聚芳醚砜…

以聚醚醚酮（ＰＥＥＫ）和苯酞圈型聚芳醚砜（ＰＤＣ）齐聚物为原料，通过溶液缩聚法制备了ＰＥＥＫ／ＰＤＣ有规嵌段共聚物系列样品。经ＤＳＣ、ＷＡＸＤ、ＴＧＡ、ＤＭＡ等方法研究表明：共聚物没有微相分离现象；其结晶属于简单正交晶系，ＰＤＣ含量对共聚物结晶行为产生很大影响；热稳定性随ＰＤＣ含量增加而明显降低；共聚物具有优异的力学性能，拉伸强度和储能模量高于ＰＥＥＫ。     

构造变形力学中有限应变张量几何解析

本文根据构造变形的特点,系统地研究了构造力学中有限应变理论的图解方法,提出来用度规张量描述一点应变状态的几何解析法,对于用变形梯度表示的变形梯度圆结构进行了论证,并用几何图形清晰地描述极分解理论中各种量的关系.最后通过各种不同方法计算了构造变形中常见的简单剪切变形,用以说明和比较各种有限应变图解法的特点.     

Synthesis and Properties of Aryloxy—terminated Polydimethylsiloxanes

Aryloxy-terminated polydimethylsiloxanes (AOS) were synthesized by the telomerization of hexamethylcyclotrisiloxane(D3) with phenols.The structures of AOS were characterized by UV,IR,^2HNMR and elemental analysis,The effects of the reaction conditions and the mole ratios of the reactants on the molecular weight of the polymer were discussed.AOS′s structural influence on bactericidal action,flocculation and hydrolysis was studied.     

聚酚氧磷腈的合成及其热分解过程

聚酚氧磷腈的合成及其热分解过程胡源１桂宙１藤本康弘２范维澄１田村昌三３（１中国科学技术大学合肥２３００２６；２日本劳动省产业安全研究所；３日本东京大学）聚磷腈是一类骨架由磷和氮原子交替排列的无机高分子化合物。由于磷原子上有两个可取代的基团，赋予了它可...     

矩阵若尔当标准形的一个新证明

现行的不少高等代数教材中,关于“每个n级复数矩阵均与一个若尔当形矩阵相似”这一结论,大多利用λ一矩阵的性质或线性变换、线性空间等理论给出证明.本文利用矩阵的性质给出了一种新的证明.     

叠加压缩相干态的量子统计性质

研究了叠加压缩相干态的量子统计性质,给出了压缩和反聚束效应与叠加系数之间的关系。结果表明,叠加压缩相干态具有压缩和反聚束的现象。压缩奇偶相干态的有关结果均作为特例包含在本文的一般结论之中。     

PMMA骨水泥的性能缺陷及针对缺陷的研究进展

聚甲基丙烯酸甲酯(PMMA)骨水泥是一种用于治疗脊柱压缩性骨折和固定关节假体的植入材料.临床上运用时仍有三大主要缺陷:甲基丙烯酸甲酯(MMA)聚合放热时会引起的骨组织热坏死、微裂纹产生及失稳扩展会导致力学性能较差,以及与骨组织机械连锁在长期移植后的失效问题.本文依照PMMA骨水泥的上述性能缺陷,提出了有针对性的研究思路...     

ω-聚点及其一些好的性质

在LF拓扑空间中,引入ω-聚点的概念,这一概念克服了以往聚点的缺点,使得对任意的LF集A,B,A-=A∨Adω和(A∨B)dω=Adω∨Bdω同时成立。     

Oblique Perforation of Thick Metallic Plates by Rigid Projectiles

Oblique perforation of thick metallic plates by rigid projectiles with various nose shapes is studied in this paper. Two perforation mechanisms, i.e., the hole enlargement for a sharp projectile nose and the plugging formation for a blunt projectile nose, are considered in the proposed analytical model. It is shown that the perforation of a thick plate is dominated by several non-dimensional numbers, i.e., the impact function, the geometry function of projectile, the non-dimensional thickness of target and the impact obliquity. Explicit formulae are obtained to predict the ballistic limit, residual velocity and directional change for the oblique perforation of thick metallic plates. The proposed model is able to predict the critical condition for the occurrence of ricochet. The proposed model is validated by comparing the predictions with other existing models and independent experimental data.The English text was polished by Keren Wang     

一致空间的理想导集映射

本文介绍一致空间的理想导集映射,并对这些映射的像展开研究.同时,介绍I-Hurewicz有界性的概念,研究I-Hurewicz有界性的基础拓扑运算性质.最后,得到一致空间中I-Hurewicz有界性的一个等价刻画.