利用金陵热电厂脱硫灰制备双免砖的研究

以金陵热电厂所排脱硫灰为主要原料,进行了免烧免蒸砖的研究。采用正交试验方法,设计了脱硫灰、水泥、集料、石膏、石灰的不同配比。试验结果表明,在配比为水泥8％、集料25％、石灰10％、石膏5％、粉煤灰52％时,生产的免烧砖强度最高。同时还研究了不同原材料对免烧砖强度的影响。     

镧和钴掺杂纳米TiO2的溶胶-凝胶法制备及其光催化性能

采用溶胶-凝胶法，制备了TiO2、Co^2＋／TiO2、La^3＋／TiO2＋,Co^2＋,La^3＋／TiO2光催化剂。通过考察掺杂离子的种类和用量对所得催化剂用于紫外光催化降解亚甲基蓝性能的影响，得出La^3＋／TiO2中La^3＋的适宜掺杂量为1.0％，Co^2＋，La^3＋／TiO2中，当La^3＋的掺杂量为1.0％时，Co^2＋的适宜掺杂量为0.2％，相应的脱色效率为99.83％、98.79％。当掺杂量适当时，四种催化剂用于紫外光催化降解亚甲基蓝的活性次序为：La^3＋／TiO2〉Co^2＋，La^3＋／TiO2〉TiO2〉Co^2＋／Ti02o XRD分析结果表明，所得光催化剂均为纳米粒子。     

大粒径聚丙烯酸丁酯胶乳的制备

采用种子乳液聚合法制备了丙烯酸酯-苯乙烯-丙烯腈共聚物生产工艺中的基础胶乳聚丙烯酸丁酯(PBA),考察了配方和工艺条件对其粒径增大的影响。结果表明,在合成种子胶乳时可加入质量分数0.2%～0.8%的乳化剂十二烷基硫酸钠;在种子胶乳粒径放大试验时,加入质量分数0.3%的乳化剂十二烷基硫酸钠及补加的单体量为种子胶乳总固体物质量的33倍可以得到大粒径的PBA胶乳。采用种子乳液聚合法进行PBA胶乳粒径放大方法简便、效果明显。     

ZnO微／纳米纤维的静电纺丝及其表征

以聚乙烯吡咯烷酮(PVP)为络合剂与醋酸锌[Zn(CH3COO)2]反应制得前驱体溶液,用静电纺丝法制备了PVP／Zn(CH3COO)2纤维,经煅烧得到具有微孔结构的氧化锌(ZnO)微／纳米纤维。对所制备纤维分别采用差热-热重分析、红外光谱分析、X射线衍射分析、扫描电镜等手段进行了表征。结果表明: PVP/Zn(CH3COO)纤维表面光滑,直径约300-700 nm,经700℃煅烧后,可得到ZnO微／纳米纤维。     

PET工程塑料概况

综述了PET工程塑料合金化方面的主要研究开发情况，就PET／PBT、PET／PC、PET／聚酯聚醚、PET／尼龙、PET／PE等合金的研究及应用情况作了简单介绍。     

Association-Based Active Access Control models with balanced scalability and flexibility

In existing Active Access Control (AAC) models, the scalability and flexibility of security policy specification should be well balanced, especially: (1) authorizations to plenty of tasks should be simplified; (2) team workflows should be enabled; (3) fine-grained constraints should be enforced. To address this issue, a family of Association-Based Active Access Control (ABAAC) models is proposed. In the minimal model ABAAC₀, users are assigned to roles while permissions are assigned to task-role associations. In a workflow case, to execute such an association some users assigned to its component role will be allocated. The association's assigned permissions can be performed by them during the task is running in the case. In ABAAC₁, a generalized association is employed to extract common authorizations from multiple associations. In ABAAC₂, a fine-grained separation of duty (SoD) is enforced among associations. In the maximal model ABAAC₃, all these features are integrated, and similar constraints can be specified more concisely. Using a software workflow, case validation is performed. Comparison with a representative association based AAC model and the most scalable AAC model so far indicates that: (1) enough scalability is achieved; (2) without decomposition of a task, different permissions can be authorized to multiple roles in it; (3) separation of more fine-grained duties than roles and tasks can be enforced.     

Preparation and Catalytic Performance of Mesostructured Aluminosilicate Nano-particles with Wormhole-Like Framework Structure

A facile two-step sol–gel method has been developed for the preparation of mesostructured aluminosilicate nano-particles (Si/Al = 7.5) with wormhole-like but uniform pore structures and highly catalytic activities towards bulky hydrocarbon cracking. It is desirable that, as this synthesis takes place in the absence of alkali cations, the mesoporous nano-particulate material is directly obtained in the acid form, making a subsequent ion-exchange and calcination treatment superfluous.     

管材超声波分层缺陷检测中盲区的构成探析

管材超声波分层检测作为控制产品质量的关键步骤,必须引起相关从业人员的重视,特别是要重点分析分层缺陷检测中盲区的构成原因和分布特征。只有这样,才能切实保证检测结果的准确性,更好地控制管材质量。通过对超声波分层缺陷检测的重要性进行阐释,分析了其中盲区的构成和分布等问题。     

聚丙烯催化剂进展及应用

介绍了聚丙烯（ＰＰ）催化剂、工艺技术的进展及近十几年世界新开发的金属茂催化剂的结构、特点及用于生产问规聚丙烯的实例。金属茂催化剂用于ＰＰ生产，为开发高性能ＰＰ产品，提高市场竞争能力提供了可能。     

HPVC/BR共混体系的性能研究

采用动态硫化方法制备高聚合度聚氯乙烯／顺丁橡胶(HPVC／BR)共混型热塑性弹性体，考察了单一组分增容剂丁腈橡胶(NBR)、氯化聚乙烯(PE—C)和(氢化苯乙烯／丁二烯／苯乙烯)嵌段共聚物(SEBS)，复合增容剂SEBS／NBR和PE—C／NBR及交联程度对HPVC／BR共温体系相容性的影响。结果表明，使用复合增容剂可明显改善HPVC／BR共混物的性能；动态硫化在改善共混物力学性能方面起主要作用。