含油污泥制煤的研究

研究了影响除油、脱水后的含油污泥与煤粉混合制备型煤的因素,以实现罐底泥、渣泥等的废物资源化。试验考察了油泥与煤的混合比例、混合时所用原煤粒度与成型率和抗压强度的关系,助燃剂的添加量和热能、未燃烬率的关系。结果表明:煤粒度在3.35 mm以下,滤饼添加量(w)在25%左右时成型率88%、抗压强度0.150 MPa、新煤热值20 962 k J/kg;助燃剂的添加量(w)1.5%时,热值能达到23 283 k J/kg,未燃烬率18.63%。     

面向模型重构的设计理性知识粒度评价方法

为满足不同抽象层次设计理性模型重构的多样性量化需求,在设计理性建模的基础上研究了设计理性知识粒度评价方法。通过辨析知识体特性分析影响设计理性模型粒度的组成因素,建立了粒度度量方法,实现了统一的评价体系,为不同粒度设计理性模型的转换、比较和优化提供了客观、量化的依据和目标。以压弯模具部分设计过程为例,验证了设计理性知识粒度评价方法对模型重构度量及指导的可行性与有效性。     

Axiomatization and conditions for neighborhoods in a covering to form a partition

In this paper, we study the axiomatic issue of a type of covering upper approximation operations. This issue was proposed as an open problem. We also further some known results by using only a single covering approximation operator to characterize the conditions for neighborhood {N(x): x ∈ U} to form a partition of universe U.     

自悬浮定向流法制备纳米Fe微粒的粒度控制

采用自悬浮定向流技术制备了金属Fe纳米微粒，对样品平均粒度进行TEM等测试分析，研究了主要制备工艺条件对微粒粒径的影响。结果表明，自悬浮定向流技术可用以制备出不同粒度的金属Fe纳米微粒，其平均粒径随熔球温度的降低和冷却气体流速的增大而减小;在1500℃左右时，微粒平均粒径随冷却惰性气体Ar压强的增大而减小，而在1600℃时，气体压强对微粒平均粒径的影响不再具有规律性。     

Dynamic adhesive forces in rough contacting bodies including normal and sliding conditions

Using a high-resolution, high-dynamic bandwidth capacitive force transducer and two piezoelectric actuators, adhesive pull-off forces between nominally flat rough silicon surfaces were measured under various dynamic conditions in normal and tangential directions and environmental humidity levels. The upper specimen approached and retracted with a constant velocity in the vertical (normal) direction, while the lower specimen started moving in the horizontal (tangential) direction during the middle of the contact. The experiments were performed under 35 and 60% relative humidity conditions. It was found that sliding of the contacting surfaces led to a significant reduction in pull-off forces under low-humidity contact conditions, whereas it caused higher pull-off forces under partially wet contact conditions. Comparing the effects of sliding velocity and sliding distance on the measured pull-off force values, it was found that the sliding distance played an important role in the increase in pull-off forces.     

基于粗糙集理论的岩体边坡稳定性模糊评价

基于粗糙集理论探讨了岩体边坡稳定性的模糊综合评价方法，即利用粗糙集中的知识约简方法来挖掘评价指标，应用信息量概念确定评价指标的权重，实例应用结果表明该法进行岩体边坡稳定性评价是可行的，且操作简单，结果可信。     

基于AGA-RS的故障特征参数提取方法研究

在故障诊断中,将高维特征空间压缩到低维特征空间可以简化故障分类器设计,提高运算效率。研究了自适应遗传算法（AGA）和粗糙集（RS）理论在特征选择和特征约简中的应用,并针对柴油机燃油喷射系统故障提取了简化特征,建立了神经网络模型。试验结果表明,基于AGA-RS的故障特征参数提取方法可使故障分类器输入参数同时具有有效性和简约性,提高了神经网络的运算效率。