摘要：Mathematical models are disappointing due to uneven distribution of the air gap magnetic field and significant un- modeled dynamics in magnetic bearing systems. The effectiveness of control deteriorates based on an inaccurate mathematical model, creating slow response speed and high jitter. To solve these problems, a model-free adaptive control （MFAC） scheme is proposed for a three-degree-of-freedom hybrid magnetic bearing （3-DoF HMB） control system. The scheme for 3-DoF HMB depends only on the control current and the objective balanced position, and it does not involve any model information. The design process of a parameter estimation algorithm is model-free, based directly on pseudo-partial-derivative （PPD） derived online from the input and output data information. The rotor start-of-suspension position of the HMB is regulated by auxiliary bearings with different inner diameters, and two kinds of operation situations （linear and nonlinear areas） are present to analyze the validity of MFAC in detail. Both simulations and experiments demonstrate that the proposed MFAC scheme handles the 3-DoF HMB control system with start-of-suspension response speed, smaller steady state error, and higher stability.

摘要：以3,4-二甲基苯胺为目标污染物,高铁酸钾(K_2Fe O_4)为氧化剂,考察催化氧化过程中的表观动力学及反应机制,确定高铁酸钾降解3,4-二甲基苯胺的表观动力学方程为:r=0.0043C_A^(0.486)C_B^(1.2477),反应级数为1.7337,符合准二级动力学方程.同时通过GC/MS技术,分析降解过程的中间产物,推测在高铁酸钾的作用下,3,4-二甲基苯胺先转变成2,4-二甲基苯胺,然后苯环上的氨基及甲基先后被氧化,生成4-硝基间苯二甲酸,再发生脱羧反应,生成硝基苯,硝基苯被高铁酸钾进一步攻击,生成苯环正离子,其后开环生成一系列小分子烃类物质,这些物质继续被氧化,最终生成二氧化碳与水.推测该氧化还原过程的控制反应为两步:第一步,高铁酸钾攻击3,4-二甲基苯胺苯环上的侧链;第二步为苯环的开环反应.此降解过程主要包括表面络合催化与界面催化两种反应机制.

摘要：目的国家文化软实力的提升,离不开文化的传承与创新。近年来文创产品设计研究引起人们更多的关注。通过对国内外文献的分析对比,以客观数据和直观图谱分析为依据,对当前文化创意产品的热点问题和发展趋势进行了分析和总结。方法运用可视化文献分析软件Cite SpaceⅤ,以中国知网—中国期刊全文数据库和Web of Science核心合集数据库中收录的文化创意产品的相关文献为数据来源,对当前国内外文化创意产品的时间和空间分布、关键词共现、研究机构和作者、研究内容和热点等方面问题绘制科学知识图谱,进行可视化分析以梳理研究脉络。结论国内对于文化创意产品设计的研究主题较多,近几年主要集中在地域文化、博物馆文创产品设计以及数字化在设计中的应用等方面。一些学者将设计与其他学科,如符号学、传播学、心理学等相结合进行研究。国外关于该主题的研究注重创新与创意表达,以及商业化,与国内研究侧重点不太一样。研究学者和研究机构合作关系较少,有待加强。

摘要：目的:通过引入坡变换,揭示表面测量中形态学操作的本质。创新点:引入坡变换,将空间域的形态学膨胀操作转换为坡域的加法操作,揭示结构元素对表面轮廓坡度和曲率的改变。方法:1.基于坡变换理论,空间域的切膨胀操作对应于坡域的加法操作(图9);2.分析圆结构元素作用于正弦波和圆的理论解;3.用不同半径的圆结构元素作用于正弦波,分析切膨胀和经典膨胀的相同和不同之处。结论:1.坡变换将形态学操作从空间域转换到坡域,可获取类似于傅立叶变换将卷积操作从空间域转换到频域的分析能力;2.切膨胀操作为经典膨胀操作的上确界,但会产生重叠区域。

摘要：温室效应日渐显著,CO_2的捕集与利用已成为一个全球性的科学研究热点。碳质吸附材料因其结构的可设计性、孔隙结构发达和化学性质稳定等特点,在气体分离领域发挥着重要的作用。本文主要介绍了近年来多孔炭材料在CO_2吸附分离领域的研究进展情况,着重介绍了提高CO_2吸附分离效率的主要方法与策略,并对碳质吸附材料未来的发展趋势进行了评述。

摘要：In order to study the influence of rubidium(Rb)addition on the phase composition,microstructure,mechanical properties and cell response of bioactive glass-ceramics,CaO−SiO2−Na2O−B2O3−MgO−ZnO−P2O5 glass system was designed with and without addition of *** results show that hydroxyapatite(HA)and Mg−whitelockite(Ca18Mg2H2(PO4)14)crystalline phases are formed in the glass matrix without *** the addition of Rb,only HA phase is *** grain size of the crystals in the glass-ceramics is larger with the addition of Rb than that of samples without *** addition can improve the bending strength of *** cultivation of human bone marrow mesenchymal stem cells(hBMSCs)on Rb-containing glass-ceramics demonstrates enhanced cell adhesion,proliferation and ALP *** conclusion,Rb-modified glass-ceramics exhibit good mechanical property,excellent bioactivity and biocompatibility,which have potential for bone regeneration application.

摘要：A feature-centered scheme is presented to represent the feature-based variational partmodel. Constraint reasoning approach and numerical approach are trigged up to satisfy theconstraints between features. Coassociations between boundary elements in feature level and partlevel are maintained to implement a series of feature operations and to implement precision featureinodslling adaptive for paramatric part geometry ***, a feature-based parametricmodelling system based on these ideas , is developed, and some examples are given finally.

摘要：针对磁悬浮开关磁阻电机参数设计问题,提出一种基于最小二乘支持向量机与粒子群优化算法的电机结构参数优化设计方法。采用三维有限元仿真建立样本空间,构建悬浮力、电磁转矩与绕组间互感的最小二乘支持向量机非参数模型;并基于该非参数模型,选择满足额定电磁转矩为约束条件,悬浮力最大且绕组间互感最小为优化目标,采用粒子群优化算法获取电机的最优结构参数。仿真结果表明:最小二乘支持向量机非参数模型精确度高,采用该优化设计方法设计的磁悬浮开关磁阻电机具有悬浮承载力强、耦合小、易于控制的优点,并且该优化设计方法算法简单、操作方便。

摘要：为了抑制偏心负载对垂直放置的摆动气缸运动造成的影响,首先提出了能够定量表示偏心负载对垂直放置的摆动气缸影响程度的速度稳定性指标αv,随后提出了使摆缸两工作腔在某一角度范围内瞬间连通,利用增大背压的方法提高摆缸系统速度稳定性的解决办法,建立了垂直放置、偏心负载作用下且具有连通孔的摆缸数学模型,在该模型的基础上以速度稳定性指标αv最小为优化目标函数,采用遗传算法对摆缸工作腔连通孔进行了优化设计.仿真和试验结果证明该方法有效地解决了摆缸速度稳定性问题.

摘要：Osmotic energy between river water and seawater has attracted interest as a new source of sustainable *** membranes in a reverse electrodialysis configuration can capture energy from salinity ***,current membrane materials suffer from high resistances,low stabilities,and low charge densities,which limit their further ***,we designed a high-performance nanofluidic membrane using carboxylic cellulose nanofibers functionalized with graphene oxide nanolamellas with cement-and-pebble microstructures and stable skeletons for enhanced ion transmembrane *** mixing artificial river water and seawater,the composite membrane achieved a high output power density up to 5.26 W m^(−2).Additionally,the membrane had an excellent acid resistance,which enabled long-term use with over 67 W m^(−2) of power *** performance of this composite membrane benefited from the mechanically strong cellulose fibers and the bonding between nanofibers and *** this work,we highlight promising directions in industrial waste treatment using energy extracted from chemical potential gradients.