Auslander Categories and Free Normalizing Extensions

Let RCS be a semidualizing(R,S)-bimodule.Then RCS induces an equiv-alent between the Auslander class AC(S)and the Bass class BC(R).Let A and B be free normalizi...     

二维卷积中信息的丢失及其弥补

提出一种解决二维卷积中信息丢失的方法.理论研究表明二维非中心点评估的卷积整数是一些确定的中心点的卷积整数的线性组合.求解出一系列非中心点评估的卷积整数,以保证处理二维数据阵时不会发生信息丢失的情况.本文还讨论了二维非中心点卷积整数的对称性和整套卷积参数的重要性.     

Chaotic Motion of a Nucleon in Heavy Nuclei with Necked-in Shape

In the framework of two-center shell model the nearest neighboring level spacing distribution and spectral rigidity of the nucleon in heavy nuclei are calculated when the shape parameters are changed systematically. Two regions of shape parameter in which the chaotic motion of the nucleon occurs are found. It is shown that the chaotic motion appears not only in the heavy nuclei with oblate shapes but also in prolate ones with a considerable neck, which is quite different from the conclusions of Ref. [2]. Bohigas Giannoni Schmit conjecture is corroborated once again by the good quantum-classical correspondence of nucleonic regular (chaotic) motion. In addition, the present work suggests that nuclear dissipation is shape-dependent,strong dissipation is expected for medium or larger separations, and provides nuclear dissipation with a dynamical understanding.     

1,4,7,10-四氮杂环十二院的合成研究

多氮杂环化合物及其衍生物近年来愈来愈显示出其重要而广泛的用途,譬如：可作为人体内结石的清除药物［‘·’j,作为MnSOD的模拟物可抑制心肌缺血性再灌注引起的损伤［’j,且具有抗爱滋病活性等;尤其是在制造磁共振成像（MRI）、X射线CT、超声成像等医学影像技术的造影剂以及恶性肿瘤的放射性治疗药物方面［‘－’‘,多氨杂环烷烃特别是1,4,7,10一四氮染环十二烷（Cyclen,环楞胺）及其衍生物显示出极其重要的应用价值．多氨杂环烷烃及其衍生物可因具体情况有不同的合成方法,环楞胺最初由乙二胶二乙酸氯与乙二胺在高度稀释条…     

聚(L-天冬氨酸)衍生物-顺铂结合物的制备及体外细胞毒性研究

通过α,β-聚(L-天冬氨酸)及其衍生物α,β,L-天冬氨酸和[α,β,L-(N-羟乙基)天冬酰胺]共聚物,[α,β,L-(N-羟乙基)天冬酰胺]和[α,β,L-(N-丁二酸基)天冬酰胺]共聚物为载体,与顺式二氯二氨合铂(Ⅱ)结合,合成了相应高分子-顺铂结合物.研究结果表明,在中性pH值络合最有效,聚合物-顺铂结合物的体外细胞毒性随结合物浓度增大而增大,但均小于同浓度顺铂毒性.     

含5-氟尿嘧啶生物可降解聚磷酰胺的合成及其抗肿瘤活性研究

通过L-赖氨酸(N¹-5-氟尿嘧啶)烷基酯双盐酸盐与二氯磷酸乙酯、二氯膦甲酸乙酯、二氯膦乙酸乙酯共聚,合成了三类12种侧链含5-氟尿嘧啶的聚磷酰胺。聚合物的结构经UV、IR、¹H NMR及元素分析鉴定。聚合物用微量细胞培养四氮唑实验方法(MTT法)进行了对人肝癌细胞系Bel-7402细胞的微量培养实验。     

用嗜热菌蛋白酶催化合成天冬甜精并同时进行DL-苯丙氨酸甲酯的光学拆分

以DL-苯丙氨酸甲酯作原料,利用嗜热菌蛋白酶和固定化嗜热菌蛋白酶催化合成了天冬甜精,经拆分得到D-苯丙氨酸甲酯。实验结果表明,不仅天冬甜精产率高,而且D-苯丙氨酸甲酯的回收率好,光学纯度高。     

偶氮苯和氧化偶氮苯液晶基元侧链聚硅氧烷液晶的合成和性能研究

利用侧链带酰氯基的聚硅氧烷与取代偶氮苯酚进行大分子反应,合成了6种以偶氮苯氧羰基为侧链的聚硅氧烷Ⅲ_a-f;将其中的Ⅲ_a-c进行氧化,得到3种以氧化偶氮苯氧羰基为侧链的聚硅氧烷Ⅳ_a-c聚合物结构通过核磁共振、红外光谱和元素分析表征,利用偏光显微镜和差热分析仪研究了聚合物的相行为.讨论了苯环上取代基和液晶基元的中心桥键对聚合物液晶性能的影响.     

Analysis of Collective Flow in High Energy Heavy-Ion Collisions in the Relativistic VUU Approach

We have calculated the collective flow for Ar+KCl collisions of 1200 MeV/A by using the relativistic Vlasov-Uehling- Uhlenbeck (VUU) equation based on the QHD-I model of Walecka. The tensitivity of flow characterized by C(ψ)a nd (P_x(Y))to mean field and in-medium NN scattering cross section is studied. It is found that the azimuthal correlation function C(ψ) is reduced dramatically after inserting the collision term and then varies very slowly between NN cross sections from σ = 10 mb to 55 mb and reaches the minimum at σ = 35 mb, while the in-plane mean transverse momentum (P_x(Y))in creases slowly all the way from σ = 0 mb to 55 mb. The collective flow is very sensitive to the momentum dependence (indicated by the effective mass m⁰) of the mean field and less sensitive to the compression modulus K and the cross sections from σ = 10 mb to 55 mb. The numerical results were compared with the experimental data, and we found that the agreement for both (P_x(Y)) and C(ψ) can be reached with the same set of mean field parameters as well as the appropriate NN cross section in collision terms.