基于面向对象技术的多媒体CAI素材库系统

建立实用、高效的多媒体ＣＡＩ素材库是高效率、高质量开发ＣＡＩ软件的基础和关键．本文从数据模型、面向对象分析和存储模式三方面入手,提出一种支撑ＣＡＩ制作工具的素材库体系结构,并讨论该体系结构的特性和进一步研究的问题．     

带模糊约束的最小费用流问题

本文首次提出了带模糊约束的最小费用流问题,建立了相应的数学模型并给出了求解这一模型的有关算法。最后,给出了一个具体实例。     

利用应用程序备份SQL Server数据策略的选择

SQL Server功能强大操作简便,日益为广大数据库用户所喜爱,许多的开发人员选择它作为后台数据库管理系统,而怎样利用应用程序来备份SQL Server数据库是很多程序员所面临的普遍性问题,文中探讨了用应用程序备份SQL Server数据库的策略和实现方法,并给出了应用实例.     

A rapid turnaround design of a high speed VLSI search processor

Performance of relational database systems is a major impediment to their use in many applications. We have designed and implemented a customized RISC processor to accelerate associative search and aggregation operations for relational database systems. Since the processor is programmable and supports many queries concurrently, a system utilizing tens of such processors is capable of handling thousands of complex search requests simultaneously.

While the design of a VLSI programmable processor is a complex process, research prototyping requires a fast turnaround design process. We took advantage of the logic programming paradigm and the silicon compiler technology to explore and simulate architecture alternatives prior to the actual implementation. The prototyping process allowed us to complete the chip design in nine months. The resulting processor, fabricated in 2 Itm CMOS technology, consists of 91,000 transistors, executes over 18 million predicate evaluations per second, and searches database contents at 74 megabytes per second.     

水溶性高聚物聚丙烯酰胺的稀溶液性质(Ⅰ)

本工作利用光散射和粘度方法,使用辐射聚合聚丙烯酰胺(PAAM)的级分样品,研究了在较宽分子量范围(10~4-10~7)内PAAM的特性粘数,分子尺寸及第二维利系数对重均分子量的依赖性.从实验上得到了PAAM在0.2mol/lNaCl水溶液中的均方旋转半径与均方末端距之间的关系及高分子-溶剂相互作用参数.     

中立型线性控制系统的最优控制

本文将就形如　的中立型线性控制系统进行深入讨论，给出此类系统的最优控制的最大值原理，并举例说明这一重要结论在经济管理系统中的应用。     

对Cluster模型的几点质疑

本文证明Cluster模型违背了细致平衡原理,指出了海中核子pick-up图象的不合理性。该模型的发射几率中不考虑复杂粒子正确构成的影响更是一个显著的倒退。     

The problem of the relation between double pomeron exchange in inclusive and exclusive experiments

The pionization region of the inclusive single-particle spectrum is accounted for by double pomeron exchange in the absorptive part of a six-point amplitude. In this paper a multiperipheral model for the six-point amplitude with double pomeron exchange is used for continuation by crossing and analyticity to the physical region of the exclusive two particle → four particle production process. The cross section for π^? p → π^?(π⁺π^?)p in the double-Regge region is then calculated and compared with the experimental analysis of Lipes, Zweig and Robertson which sets an upper bound to the strength of the double pomeron exchange coupling. This upper bound, coupled with the model for continuation to the inclusive cross section, is shown to give too small a magnitude for the double pomeron exchange in the pionization region. Further avenues for investigation are discussed.     

A case for large Auger recombination cross sections associated with deep centers in semiconductors

It is argued that the recent quantitative results concerning localized defects in semiconductors (e.g. GaAs) are consistent with the possibility of large Auger-type cross sections associated with recombination at these centers.It is proposed that many of the capture cross sections reported to be in the range 10^?13–10^?16cm², which exhibit only weak temperature dependence, and which do not depend on carrier concentration, might be explained by this mechanism.