Carrier phase shifted SPWM based on current sourced multi-modular converter for active power filter

A novel current-source active power filter(APF)based on multi-modular converter with carrier phase-shifted SPWM(CPS-SPWM)technique is proposed.With this technique,the effect of equivalent high switching frequency converter is obtained with low switching frequency converter.It is very promising in current-source APF that adopt superconducting magnetic energy storage component.     

He-Ne激光管的允许漏率与可检漏率

本文讨论了He－Ne激光管对空气及对氦气的允许漏率，提出用累积法对激光管的无损检漏问题，并对其最小可检漏率及特征时间提出一些具体数据．     

机遇、挑战与对策:人工智能时代的教学变革

人工智能浪潮以不可抵挡之势席卷教育,为课堂教学带来了无限发展机遇:教学层面促进教学质量的提升;教师层面促使教师角色多样化;学生层面有利于私人定制化的来临。但同时,也不可避免地导致教学缺乏人文关怀,教师权威遭遇威胁,学生能力遇到挑战,个人信息面临泄露等情况。鉴于此,在人工智能时代,回归教学的育人本质是其应有之义,教师"走进"人工智能为其主体之维,健全法规、加强监管是其实现之途。     

三苯基2-吡啶乙酸脂硫氰酸根离子电极的研究

该文首次研究以三苯基2-吡啶乙酸脂为中性载体,制备了一种呈现出反Hofmeister选择性行为的PVC膜电极,其对硫氰酸根离子(SCN-)具有优良的电位响应特性,该电极在pH 5.0的磷酸盐缓冲体系中具有最佳的电位响应,在1.0×10-1-5.0×10-5moVL SCN-浓度范围呈近能斯特响应,斜率为52.7 mY/dec(25℃),检测下限为2.0×10-5mol/L.采用交流阻抗和光谱分析技术初步研究了载体与SCN-之间的作用关系.     

油压顶车机密封系统的改进

文章简单介绍了陶瓷工业生产中的隧道窑炉的油压顶车机的漏油问题,并结合生产实际, 详细介绍了针对该问题设计出的改进办法和做出的具体措施,有效地解决了油压顶车机的漏油问题。     

烧结机本体漏风率在线测量技术及应用

研究烧结系统漏风率分布状况发现,主要漏风区域是烧结机本体。针对该区段开发了以量热法为基础的在线漏风测量技术,可以对不同风箱漏风率变化状况进行监测,结合对其他区段漏风率的检测,可为有效采取减漏措施提供依据,实现了有效降低烧结系统漏风率的目的。     

浅谈屋面渗漏的原因及其控制措施

根据有关的理论研究和分析资料介绍了土建工程的屋面渗漏的主要原因,并结合施工单位及监理单位的实践经验,提出了适合于中国国情的解决屋面渗漏的质量控制措施的思路     

Study on hydrogen sulfide removal based on bench-scale experiment by bio-trickling filter

A bench-scale experiment for control of hydrogen sulfide (H2S) emissions was carried out continuously for nearly four months by using bio-trickling filter packed with ZX01 stuffing. The results suggested that the bio-trickling filter had proven excellent performance over substantial operational periods. Removal efficiency of H2S was nearly 100% when volumetric loading of the bio-trickling filter varied from 0.64 g/(m3·h) to 38.20 g/(m3·h) and metabolism products of H2S were mainly composed of SO42–. When inlet concentration of H2S was 250 mg/m3, the optimum gas retention time was 30 s and the optimum spray water flow rate was 0.005 9~0.012 L/(cm2·h). The bio-trickling filter had good ability to resist shock of high volumetric loading, and was not blocked during experiments for nearly four months during which resistance was maintained at relatively lower value, so that the bio-trickling filter need not carry out back washing frequently and can be operated steadily for long-term.     

水力裂缝与可渗透天然裂缝交互作用漏失研究

对于现场真实地层,当水力裂缝在地层中生长时,由于天然裂缝存在,会扰乱预期的水力裂缝的延伸,造成不可控的裂缝走向。要研究真实水力裂缝的延伸,就必须考虑水力裂缝与天然裂缝相交后的压裂液漏失情况。通过研究在水力裂缝与天然裂缝交互作用下,压裂液在天然裂缝中的漏失情况,得到压裂液侵入到天然裂缝中所存在的裂缝打开区、裂缝漏失区、裂缝闭合受压区、原始裂缝区四个区域,并且得到相应的控制方程,可更好地为水力裂缝的延伸和裂缝网的形成提供理论依据。     

A new optimization algorithm based on chaos

INTRODUCTION Chaos (Wang et al., 2002) is a common nonlin- ear phenomenon, whose action is complex and similar to that of randomness. The characteristics of chaos being highly sensitive to the initial value of chaos make a world of differences due to the ergodic prop- erty of the phase space—chaos can go through all states in certain ranges without repetition; the inher- ent randomness of the system—means that chaos behavior is similar to randomness which is disorderly; but at the same t…