计算烷烃沸点的新方法-基团键贡献法

根据分子中基团的特性和连接性,将基团贡献法和化学键贡献法结合在一起,发展了一种直接根据分子结构信息计算烷烃沸点的新方法-基团键贡献法,此方法同时具有基团贡献法和化学键贡献法的特点。对753种烷烃(C2～C100)的计算结果表明,沸点计算值与实验值的一致性令人满意,平均误差0.46%。     

醇类在芳烃溶剂中的缔合溶液热力学

用凝固点降低法测量了在C1-C4醇类的各异构物分别存在下, 苯和对二甲苯溶剂的活度系数γB。用Wiehe-Bagley(WB)模型对数据进行了处理, 得到各醇的自缔合常数KA及无限稀活度系数γA。在同一溶剂中, KA依下列顺序减小: 甲醇>乙醇>正丙醇>正丁醇; 正丙醇>异丙醇; 正丁醇>异丁醇>叔丁醇≥仲丁醇。各醇在对二甲苯中的KA均大于相应的在苯中的KA。     

Some Extremal Properties of Section Spaces of Banach Bundles and Their Duals,II

Let π : E → X be a real Banach bundle with section space Γ(π), where X is a compact Hausdorff space. We complete the characterization of weak-* and sequential weak-* points of continuity in the unit ball of Γ(π) ? for certain classes of bundles (which include the trivial ones), which was begun in an earlier paper. The proofs avoid the use of vector measures.     

A Characterization of l + 1(Γ)

In this article we give necessary and sufficient conditions in order a closed cone of a Banach space E to be isomorphic to the positive cone l ₁ ⁺(Γ) of an l ₁(Γ) space. This problem has applications in the theory of Banach spaces as in the characterization of reflexive spaces and also on the problem of the embeddability of 1in Banach spaces.     

含盐二元素的等压气液平衡研究

本文用改进的Rose分别测定了在750mmHg压力下的丙酮-甲醇-NaI体系和700mmHg压力下的异丙醇-水-LiCl, CaCl2, NH4Cl, (CH3)4NCl体系的气液平衡数据。当双液系组成固定时, 盐的浓度与沸点之间存在线性关系, 与热力学导出的线性关系基本相符。