Application of Rough Sets to Evaluate Fabric Smoothness Grade

For garment or fabric appearance, the cloth smoothness grade is one of the most important performance factors in textile and garment community. In this paper, on the base of Rough Set Theory,a new objective method for fabric smoothness grade evaluation was constructed. The objective smoothness grading model took the parameters of 120 AATCC replicas' point-sampled models as the conditional attributes and formed the smoothness grading decision table. Then, NS discretization method and genetic algorithm reduct...     

基于关系矩阵的信息系统属性约简算法

提出了信息系统属性约简的一种新算法,从关系矩阵角度定义了属性重要度及非核属性次要度,然后以属性重要度指标作为启发式信息,辅以属性次要度,设计了一种简洁、有效的属性约简算法.该算法具有较大的灵活性,能从搜索空间逐次删除重要度为零及次要度低的属性,避免对这些属性进行重复搜索,提高了搜索的效率,最后通过实例验证了算法的可行性与有效性.     

Reduction of 1-3 mm iron ore by H2 in a fluidized bed

The reduction of 1-3 mm fine powder of iron ore by H₂ was conducted in a lab-fabricated kg class high temperature fluidized bed. The results show that the differential pressure in the fluidized bed, which has small fluctuation with time, increases with the increase of gas flowing velocity. The utilization ratio of gas decreases when the reaction lasts longer time indicating that the reaction is faster at the beginning of reduction and becomes slower in the latter process. The higher the reaction temperature is, the higher the utilization ratio of gas is, but the difference of utilization ratio among the different temperatures becomes smaller with time. The utilization ratio of gas and the metallization ratio can reach 9% and 84% respectively at 750℃ for 20 min, which shows the reduction reaction by H₂ is very fast. The increase of metallization ratio with gas velocity performs quite good linearity, which shows that a higher velocity of reducing gas can be used to improve the productivity of the reactor when H₂ is used as reducing gas. With the increase of charge height, the metallization ratio decreases, but the utilization ratio of gas increases. The reaction temperature can be reduced to 700-750℃ from 800-850℃ when H₂ is used as reducing gas.     

干法灰化-ICP-AES法测定奶粉中的磷

用干法灰化法处理奶粉样品,电感耦合等离子体发射光谱法（ICP-AES）测定了样品中磷的含量,并研究了干法灰化最佳温度和仪器最佳工作条件.本法与其他方法比较,处理样品方法简单、快速,测定结果准确可靠,方法检出限为0.0505 mg/L,回收率为95.8%—105.2%.     

煤气发生炉废热利用技术分析

分析了煤气发生炉的运行现状,论述了在当前能源紧缺的情况下回收煤气发生炉废热的必要性和可行性,并提出了技术方案,最后进行了效益估算.     

管道仪表的一种减振方法

针对安装在煤气管线的涡街流量计因受振动干扰使计量数据严重失真的问题,采用了涡街流量计两端连接防振接头的方法,可大幅度地衰减管道振动对其检测精度的影响。     

模拟程控发射系统控制方法研究

为有效评估高射频武器系统的射频及弹丸速度测量系统性能,提出了一种基于可编程序逻辑控制器(PLC)的发射系统程控方法,给出了模拟程控发射系统的组成、控制流程及软件设计方法,对产生程控时序误差的原因进行了分析,通过光幕靶测定了弹丸射击的时间间隔,对击发机构的动作时间间隔进行了修正,实现了三支单发发射装置的程控联动发射,为高射频测速系统的性能考核提供了试验平台。     

基于贝叶斯粗糙集模型的属性约简算法

在分析贝叶斯粗糙集模型已有的约简算法的基础上,从含有多个决策类情况下的全局相对增益函数的角度,利用二进制编码方法给出一种求贝叶斯粗糙集所有约简及核的算法,并基于实际应用,给出对求出的所有约简进行筛选的拓展算法。通过算例说明算法的实用性和有效性。     

优待电价对中小化肥企业节能的影响

分析了电价对中小化肥企业综合成本的影响,指出优待电价降低了中小化肥企业采用先进工艺节能降耗的积极性.     

P2P系统中基于属性约减的可信度评价

由于P2P系统的开放、匿名等特点,传统的访问控制和认证方法已无法在P2P系统中对信任协商进行有效的支持.本文利用信任协商机制和多信任域技术对P2P系统进行安全管理.针对信任凭证在信任协商过程中存在的安全隐患,通过属性的使用记录实现信任凭证中属性集的约减,并给出一种基于属性集的可信度评估方法.该方法减少了访问者属性信息的不必要暴露,提高了信任协商交互的可靠性和安全性.