逻辑综合在数字IC设计中的应用

随着数字IC的规模和复杂性不断增加,数字IC设计的难度也在加大,为了更好地进行数字IC设计,业界普遍采用了自动化的设计方式,通过应用工具软件,将IC设计的效率极大地提高.主要探讨了在IC设计当中逻辑综合方面的问题.     

Low order integral-action controller synthesis

A simple controller synthesis method is developed for certain classes of linear, time-invariant, multi-input multi-output plants. The number of poles in each entry of these controllers depends on the number of right-half plane plant zeros, and is independent of the number of poles of the plant to be stabilized. Furthermore, these controllers have integral-action so that they achieve asymptotic tracking of step input references with zero steady-state error. The designed controller’s poles and zeros are all in the stable region with the exception of one pole at the origin for the integral-action design requirement. The freedom available in the design parameters may be used for additional performance objectives, although the only goal here is stabilization and tracking of constant references.     

对DAG-MAP算法的研究

DAG－MAP是一个面向延迟优化的FPGA工艺映射算法,其中的标记过程是该算法的核心.文章对原算法中的标记过程进行了研究,并且提出了一个改进的标记方法.通过对MCNC标准测试电路的实验结果表明该算法比原算法更为有效,并且算法所用时间没有明显的增加.     

AutoCAD在机构综合中的应用

利用计算机辅助设计中的图形处理技术,实现常用机构的图解法综合。作图求解精度可达到解析法的求解精度。用于解决机械原理多媒体辅助教学软件中有关机构综合问题,取得了明显的效果。     

Synthesis and characterisation of alumina pillared Texas montmorillonite and determination of the effective Keggin ion charge

Controlled calcination of Texas montmorillonite has allowed production of a range of materials of cation exchange capacity from 70 mequiv./100 g dry clay to virtually zero. Pillaring of these with Chlorhydrol precursor solution has then provided a family of materials of pillar density ranging from about one per six unit cells to zero. The analytical technique based on isomorphous metal dilution (IMD) that follows pillaring is validated. The results provide a consistent value for the precursor (Keggin) ion charge, in the conditions normally used, of 3.15±0.10 rather than the formal value of 7. An approach to the attainment of pillar densities consistent with the introduction of shape/size selectivity on pillared layered materials is outlined.     

Preparation of acidic or bifunctional catalysts by means of straightforward calcination of as-synthesized [Ga]-ZSM-5 zeolites obtained from alkali-free media. Propane aromatization

Propane aromatization (530°C, 1 atm) was used as a reaction model to evaluate the effect of the calcination temperature on the catalytic properties of an as-synthesized [Ga_1.3]-ZSM-5 zeolite obtained from alkali-free media and calcined at two different temperatures: 530°C (C-530) and 750°C (C-750). Results show that in spite of its lower acidity, C-750 is more active and selective toward aromatics than C-530. This is probably due to the fact that at higher temperature the decomposition of organic compounds used during the zeolite synthesis is accompanied by a partial degalliation of the zeolitic support leading to the production of a bifunctional xGa₂O₃ /H-[Ga_y-ZSM-5(2x+y=1.3)catalyst.     

高收缩共聚酯合成性能与成纤性能研究

通过共聚酯PEIT(间苯二甲酸、对苯二甲酸、乙二醇共聚物)的合成及其全拉伸丝(FDY)纺丝的成功实验,研究了高收缩PEIT共聚物合成工艺中共聚组分间苯二甲酸(IPA)的摩尔百分数对共聚酯PEIT的玻璃化温度、熔点的影响,探讨了该PEIT共聚物的结晶性能及其纺丝工艺条件对高收缩纤维性能的影响。     

二（2—乙基己基）硫代磷酸的合成

研究了新型萃取剂二(2-乙基己基)硫代磷酸的合成、纯化及结构鉴定。     

细胞分裂素6─BA合成新方法的研究

用医药工业的副产物乙酰基次黄嘌呤（Ⅰ）在弱酸条件下水解，生成次黄嘌呤（Ⅱ），经三氟氧磷在吡啶溶液中缩合，生成６－吡啶盐中间体（Ⅲ），再与苄胺反应，制得高效植物细胞分裂素６－ＢＡ（Ⅳ）。     

乙烯基-β-紫罗兰醇的合成

以氯乙烯和金属镁为原料,反应制得格氏试剂乙烯基氯化镁;再与β-紫罗兰酮发生加成反应得到合成维生素A的重要中间体乙烯基-β-紫罗兰醇。通过对反应条件和工艺的研究和优化,确定了最佳工艺条件为：金属镁与β-紫罗兰酮的摩尔比为1.3∶1.0,滴加β-紫罗兰酮的温度为0~5℃,在反应温度20~25℃时继续反应3~4h,得到乙烯基-β-紫罗兰醇的收率为98.0%,气相色谱（GC）分析含量为92.5%。该工艺条件得到了实验室放大的验证。