干法选煤评述

文章以大量详实的资料,回顾了干法选煤技术的理论与实践研究成果和取得的新进展,指出了研究先进高效的干法选煤技术对顺应我国煤炭工业战略西移,促进洁净煤事业的全面发展的重要意义。     

磁约束脉冲放电电路分析

在已进行的实验研究的基础上,对所设计的磁约束脉冲放电电路进行了理论分析,获得了有关磁约束放电情况下的电路特性的认识。作者的研究为应用于磁约束放电的电路的进一步研究和改进打下了基础。     

MCR型SVC在轧钢供电系统中的仿真与应用

针对某轧钢厂10 kV母线的电能质量治理问题,将MCR型静止型动态无功补偿器(SVC)应用于该厂供电系统的改造。介绍了MCR型SVC的工作原理及特点,根据该厂10 kV母线的实际负荷情况,利用Matlab/Simulink仿真软件,搭建MCR型SVC仿真模型并进行仿真设计。实测数据表明,MCR型SVC在10 kV轧钢供电系统中能够有效地提高功率因数、抑制谐波,说明所采用的工程设计结合仿真分析的方法取得了良好的效果。     

基于分级磁阀结构的三相磁控电抗器谐波抑制研究

为了降低磁控电抗器MCR产生的谐波对电网的影响,笔者提出将MCR工作铁心设计为分级磁阀结构,并建立了这种铁心结构的磁路等效数学模型。在分析一般磁控电抗器谐波分布特性的基础上,给出了分级磁阀结构电抗器的谐波抵消原理。计算结果表明分级磁阀结构电抗器将现有MCR半极限饱和条件下输入电网的最大谐波电流含量由6%降低到3%。     

Magnetocontrollable Droplet and Bubble Manipulation on a Stable Amphibious Slippery Gel Surface

Smart manipulation of liquid/bubble transport has garnered widespread attention due to its potential applications in many fields. Designing a responsive surface has emerged as an effective strategy for achieving controllable transport of liquids/bubbles. However, it is still challenging to fabricate stable amphibious responsive surfaces that can be used for the smart manipulation of liquid in air and bubbles underwater. Here, amphibious slippery surfaces are fabricated using magnetically responsive soft poly(dimethylsiloxane) doped with iron powder and silicone oil. The slippery gel surface retains its magnetic responsiveness and demonstrates strong affinity for bubbles underwater but shows small and switching resistance forces with the water droplets in air and bubbles underwater, which is the key factor for achieving the controllable transport of liquids/bubbles. On the slippery gel surface, the sliding behaviors of water droplets and bubbles can be reversibly controlled by alternately applying/removing an external magnetic field. Notably, compared with slippery liquid‐infused porous surfaces, the slippery gel surface demonstrates outstanding stability, whether in air or underwater, even after 100 cycles of alternately applying/removing the magnetic field. This surface shows potential applications in gas/liquid microreactors, gas–liquid mixed fluid transportation, bubble/droplet manipulation, etc.     

Janus Magnetic‐Plasmonic Nanoparticles for Magnetically Guided and Thermally Activated Cancer Therapy

Progress of thermal tumor therapies and their translation into clinical practice are limited by insufficient nanoparticle concentration to release therapeutic heating at the tumor site after systemic administration. Herein, the use of Janus magneto‐plasmonic nanoparticles, made of gold nanostars and iron oxide nanospheres, as efficient therapeutic nanoheaters whose on‐site delivery can be improved by magnetic targeting, is proposed. Single and combined magneto‐ and photo‐thermal heating properties of Janus nanoparticles render them as compelling heating elements, depending on the nanoparticle dose, magnetic lobe size, and milieu conditions. In cancer cells, a much more effective effect is observed for photothermia compared to magnetic hyperthermia, while combination of the two modalities into a magneto‐photothermal treatment results in a synergistic cytotoxic effect in vitro. The high potential of the Janus nanoparticles for magnetic guiding confirms them to be excellent nanostructures for in vivo magnetically enhanced photothermal therapy, leading to efficient tumor growth inhibition.     

Multifunctional Janus Microplates Arrays Actuated by Magnetic Fields for Water/Light Switches and Bio‐Inspired Assimilatory Coloration

Smart dynamic regulation structured surfaces, inspired by nature, which can dynamically change their surface topographies under external stimuli for convertible fluidic and optical properties, have recently motivated significant interest for scientific research and industrial applications. However, there is still high demand for the development of multifunctional dynamically transformable surfaces using facile preparation strategies. In this work, a type of Janus high‐aspect‐ratio magnetically responsive microplates array (HAR‐MMA) is readily fabricated by integrating a flexible laser scanning strategy, smart shape‐memory‐polymer‐based soft transfer, and a simple surface treatment. By applying external magnetic field, instantaneous and reversible deformation of Janus HAR‐MMA can be actuated, so surface wettability can be reversibly switched between superhydrophobic (158°) and hydrophilic (40°) states, based on which a novel magnetically responsive water droplet switch can be realized. Moreover, inspired by the biological assimilatory coloration of chameleons, dynamically color conversion can be skillfully realized by applying different colors on each side of the Janus HAR‐MMA. Finally, as a proof‐of‐concept demonstration in light manipulation, a HAR‐MMA is applied as an optical shutter actuated by external magnetic field with eximious controllability and repeatability. The developed multifunctional HAR‐MMA provides a versatile platform for microfluidic, biomedical, and optical applications.     

磁稳定床反应器中己内酰胺加氢精制过程研究

对以非晶态合金（SRNA－4）为催化剂的磁稳定床已丙酰加氢精制过程进行了研究，研究了各种操作参数对反应结果的影响，考察了催化剂的稳定性，建立了反应器模型。实验结果表明，在磁稳定床反应器中对已丙酰胺水溶液加氢精制，可使已丙酰胺水溶液的PM值为100s提高到3000s以上，催化剂寿命1350h；与工业上搅拌釜工已丙酰胺加氢精制工艺相比，催化剂耗量可降低50％以上。     

磁悬浮高速离心式鼓风机的喘振检测

针对磁悬浮高速离心式鼓风机的喘振问题,提出了一种基于磁悬浮轴承的喘振检测方法。该方法采用通用同频陷波器滤除转子位移中的同频分量,消除了同频扰动对喘振检测的影响;通过分析不同收敛因子对喘振频率估计的作用,基于自适应估计提出了变收敛因子的喘振频率和幅值估计方法,减小了低频信号的干扰,提高了喘振信号检测的快速响应能力。最后,分析了改进检测算法的收敛性,并在100kW磁悬浮离心式鼓风机测试系统上进行了实验验证。实验结果表明,改进后的喘振检测算法可在喘振发生前检测出喘振先兆旋转失速信号,在喘振发生0.23s内检测出喘振信号,较改进前的检测结果提高了2.6s。该检测方法无需外加其它检测单元,算法简单、快速,计算量小、并可有效地反映喘振发生过程中频率与振幅的变化。     

磁共振式无线电能传输系统应用的电磁环境安全性研究及综述

随着磁共振式无线电能传输技术的研究与推广应用,基于该技术系统工作时电磁环境安全性的研究极为重要。首先阐述了磁共振式无线电能传输技术的发展历史和应用情况,在此基础上介绍了电磁环境对生物体影响的研究概况。通过比较国际上的电磁辐射暴露限值导则和国内相关的主要标准,综述了磁共振式无线电能传输系统电磁环境的研究现状,具体包括:目前主要的磁共振式无线电能传输技术的系统结构;电磁场研究中参考的人体解剖模型;电磁场分布的数值计算和仿真方法。最后进一步具体分析了磁共振式无线电能传输系统电磁环境研究中亟待解决的问题和未来的发展趋势。