纳米磁性液体的分散稳定性分析

从纳米磁性液体中磁性颗粒的沉淀和团聚的角度分析了磁性液体稳定分散的条件，讨论了在外场下磁性颗粒的尺寸对其沉淀的影响，并引入势能的概念定量研究了决定磁性颗粒团聚体形成的3种主要作用力。利用数值计算的方法，讨论了3种相互作用势能以及净势能与磁性颗粒间表面间距和表面活性剂层厚度的关系。结果表明，增大表面活性剂层的厚度是避免磁性颗粒团聚体形成的关键措施。     

被忽视的公共理念——构建为公众服务的公共交通

随着我国私人小汽车拥有量的快速增长,城市交通拥堵等问题日益突出,优先发展公共交通已成共识。但对发展公共交通的探讨通常过于注重如何降低居民出行的经济成本,片面强调公交优先是对工薪阶层和低收入人群的优先。为了引起人们对私人小汽车与公共交通竞争发展条件下被忽视的"公共理念"的关注,使公共交通真正成为所有人的选择,必须在"公共理念"的基础上,针对我国现状提出一系列发展公共交通的举措。     

模拟复合正交神经网络在轴向磁轴承中的控制研究

在数字复合正交神经网络(NN)的基础上提出一种模拟复合正交神经网络,并用于轴向磁轴承的控制中.控制器采用模拟复合正交神经网络与PID的并行控制方法,对带有负载干扰的轴向磁轴承控制系统作了PID控制与NN PID控制的仿真实验.仿真结果表明,相对于常规PID控制器,该并行控制法具有非常好的抗干扰与自适应能力,获得了满意的控制效果.     

退火对软磁合金的最大磁导率影响的机理研究

本文以Fe－Ni软磁合金为研究对象，从晶体缺陷及内应力两方面分析了退火参数对最大磁导率影响的机理，指出位错、晶界以及晶格畸变应力是影响最大磁导率的主要因素。     

基于功能梯度磁电复合材料的新型自偏置磁传感器

文章采用超磁致伸缩材料Terfenol-D(Tb0.37Dy0.63Fe2)、金属玻璃Metglas 2605SA1和压电材料PZT(Pb(Zr, Ti)O3)，设计了一种基于功能梯度磁电复合材料的新型自偏置磁传感器.利用Metglas和Terfenol-D之间的磁导率和矫顽力差异产生较强的磁化梯度，打破原有的平衡状态，导致内建磁场产生，进一步提高了零偏置磁场下磁致伸缩材料的压磁系数和磁电响应.实验结果表明：该传感器获得了较高的低频和高频零偏置磁电电压系数，分别达到9.14 mV/Oe和572 mV/Oe，并且谐振磁电电压输出和激励交变磁场之间呈线性变化关系.该自偏置磁传感器避免了传统磁电传感器对偏置磁场的依赖，具有制作简单、成本低、体积小，无需偏置磁场以及灵敏度高等优点.     

纯电动汽车磁助力启动制动结构设计

根据纯电动汽车整丰在运行条件下制动力矩的需求，设计了一种磁助力启动制动系统。利用电磁同性相斥、异性相吸的原理，根据车轮速度时时变化控制和改变磁极磁性，在汽车起步和制动过程起到磁助力作用。计算了电磁启动制动力矩，设计了电磁制动控制电路。基于ECE法规设计了制动力分配算法，计算表明：在高响应测速传感器的反馈控刺中，磁动力启动制动结构能够迅速有效地起到助力作用，为改善纯电动汽车的行车效能提供了新的思路。     

均匀磁场中的平面载流线圈

本文以最普遍的方式讨论了任意形状的平面载流圈在均匀磁场中的力学性质，从而在普遍的意义上定义了平面载流圈的磁矩．     

Functional and dynamic magnetic resonance imaging using vector adaptive weights smoothing

We consider the problem of statistical inference for functional and dynamic magnetic resonance imaging (MRI). A new approach is proposed which extends the adaptive weights smoothing procedure of Polzehl and Spokoiny that was originally designed for image denoising. We demonstrate how the adaptive weights smoothing method can be applied to time series of images, which typically occur in functional and dynamic MRI. It is shown how signal detection in functional MRI and the analysis of dynamic MRI can benefit from spatially adaptive smoothing. The performance of the procedure is illustrated by using real and simulated data.     

Health‐Economics Analyses Applied to ELF Electric and Magnetic Fields

Extremely low frequency electric and magnetic fields (ELF EMFs) are a common exposure for modern populations. The prevailing public‐health protection paradigm is that quantitative exposure limits are based on the established acute effects, whereas the possible chronic effects are considered too uncertain for quantitative limits, but might justify precautionary measures. The choice of precautionary measures can be informed by a health‐economics analysis (HEA). We consider four such analyses of precautionary measures that have been conducted at a national or state level in California, the Netherlands, the United Kingdom, and Israel. We describe the context of each analysis, examine how they deal with some of the more significant issues that arise, and present a comparison of the input parameters and assumptions used. The four HEAs are methodologically similar. The most significant qualitative choices that have to be made are what dose‐response relationship to assume, what allowance if any to make for uncertainty, and, for a CBA only, what diseases to consider, and all four analyses made similar choices. These analyses suggest that, on the assumptions made, there are some low‐cost measures, such as rephasing, that can be applied to transmission in some circumstances and that can be justifiable in cost‐benefit terms, but that higher cost measures, such as undergrounding, become unjustifiable. Of the four HEAs, those in the United Kingdom and Israel were influential in determining the country's EMF policy. In California and Netherlands, the HEA may well have informed the debate, but the policy chosen did not stem directly from the HEA.     

试论“暴力美学”及其特征

“暴力美学”原指起源于美国，在香港电影界发展成熟的一种艺术趣味和形式探索。现代社会所指“暴力美学”的范围不仅仅包括电影，还包括电子游戏、漫画、动画、平面设计、广告等多个方面。通过研究“暴力美学”，有助于更好地掌握其真正的美学价值与含义。