采用分级模糊滑模控制器实现二级倒立摆的解耦控制

针对二级倒立摆系统的非线性强耦合的特点,提出和采用了一种新型分级模糊滑模(HFSM)控制器的思想,实现了对二级倒立摆系统的解耦控制。基于李亚普诺夫函数采用自适应规则来调节分级模糊滑模控制器参数,保证系统可靠稳定性。通过系统仿真实验,也验证了该方法的可行性和优于采用常规模糊滑模解耦控制的解耦性能。     

Modeling of Methane Release from Intact Coal

Development of percolating clusters when loading samples of a geomaterial that is hierarchically and stochastically heterogeneous is modeled. The conditions are analyzed for propagation of crack under pressure of methane in the transition phase from a bound state into a free one on the faces of the growing crack in coal. __________ Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 5, pp. 18–27, September–October, 2005.     

KMLF-80/55型斜窄流分级浓缩箱在锡矿山的应用

介绍了KMLF斜窄流分级浓缩箱的原理与结构特点。在梁河锡矿选矿厂的应用实践表明,该设备性能先进,分级过程平稳,分级效率高,为矿浆选别作业创造了条件。     

神经网络在建立螺旋分级机数学模型中的应用

随着矿业生产的发展，基于多元回归理论的数学模型已难以满足精度要求，应用神经网络技术可以较少的试验工作量，建立高精度的变量间非线性映射模型，取得了满意的效果。     

SLK型涡流空气分级机动态气流密封装置设计

密封的好坏对涡流空气分级机的分级成品质量有重要影响。对传统机械密封方式的结构及其原理进行分析,指出其特点与不足,并应用动态叶轮密封原理,设计一种新型动态气流密封装置,在生产中应用取得良好效果。     

明代贵州卫所屯堡聚落形制初探——兼与长城和海防沿线卫所比较

明朝初年推行卫所制度,短时期内在全国范围建立了各级卫所屯堡聚落,贵州不少城镇的形成均来源于此。与都司一卫一千户所一百户所的军事层级相对应,因为驻扎军士数量、承担功能、所处位置的不同,各层级的聚落也形成了不同的形制。文章以贵州卫所屯堡聚落体系为研究对象,基于地方志材料以及实地调研踏勘,讨论明代卫所制度下贵州都司城-卫城-千户所城-(百户所)屯堡等各层级聚落的总体规模及大致布局。研究表明,各级卫所聚落在规模上呈现明显的层级缩减态势,各级聚落基本为方形城垣,其中的道路、官署、城门等也受层级影响。最后将贵州卫所屯堡聚落与北方长城沿线、东部海防沿线的卫所聚落进行了初步比较。     

Spatial variability in mortality inequalities, socioeconomic deprivation, and air pollution in small areas of the Barcelona Metropolitan Region, Spain

Background

There is evidence that geographic variability of social health inequalities continues to exist even after individual risk factors have been taken into account. However, relatively few studies have examined the contribution of exposure to air pollutants to those inequalities.

Objectives

To study the geographic variability of inequalities in mortality and their associations with socioeconomic and environmental inequalities in small areas of the metropolitan of Barcelona during the period 1994 to 2003.

Methods

As in the MEDEA Project, the small area unit was the census tract. Study population consisted of the residents of the metropolitan area of Barcelona. Response variables were all-cause and specific-cause standardized mortality ratio (SMR). Explanatory variables were deprivation index, summarizing socioeconomic variables of the census tracts, and estimates of air pollutant exposures. Bayesian hierarchical models were used in order to reduce the extra variability when using SMR and to assess associations between mortality and deprivation and air pollution.

Results

Statistically significant associations with deprivation were found for the causes of death related to consumption of tobacco and alcohol for men and, besides lung cancer, diet-related causes for women. Statistically significant pollution coefficients were only found in the metropolitan area of Barcelona and in men. A positive interaction between pollutants and the deprivation index was statistically significant for respiratory mortality and PM₁₀, and ischemic disease mortality and NO₂, both for men.

Conclusions

We found deprivation to be associated in a statistically significant way with the geographical variation in mortality in the census tracts of the metropolitan area of Barcelona, in the period 1994 to 2003. Those air pollutants more directly related with traffic modify some of these associations.     

概周期过程周期初态的虚拟寻优法

概周期过程最优控制的核心是周期初态的寻优。本文提出一种虚拟寻优法,再配之以周期之间适当的状态连接,既大大减少了计算量和存贮量,又收到了较好的优化效果。水厂最优控制的仿真验证了本文方法的有效性。     

城市供热可持续发展模式研究

根据可持续发展的原则与指导思想,建立了城市供热可持续发展模式评价指标体系,并将层次分析法首次应用到城市供热各种模式的可持续性的研究工作中,明确了评价指标的量化方法。以哈尔滨市供热中常用的七种模式为例,说明了评价方法以及评价结果对城市供热可持续发展模式研究的指导作用。     

圩-垛田景观格局下的“水-田-村”布局模式

江苏省兴化地区位于里下河平原腹部的低洼地带,为万水交汇之地,其极具浓郁地域色彩的圩–垛田景观近年来受到众多学者的广泛关注。在区域尺度下,从水文环境变迁和人居环境建设两方面,归纳兴化地区圩–垛田景观发展的演变动力;在市域尺度下,分析兴化地区水利系统、农业开垦及聚落布局的地带特征。从形态学角度,研究兴化地区由东至西,自然地势不断降低、水网逐渐稠密、土地肌理愈发破碎,农田形态发育与聚落形态发展之间的内在关系,以及圩–垛田景观格局下,兴化地区独有的“水–田–村”布局模式。圩–垛田景观的形成是千百年来水与土地不断分解与整合后的结果,圩–垛田景观格局的发展和演变展示了兴化地区传统人居环境营建与自然系统之间相互选择、相互适应的过程,显示了劳动人民治水、农耕和营居的古老智慧。