Polymeric (SU-8) optical microscanner driven by electrostatic actuation

A torsional micromechanical scanner was fabricated using photosensitive polymer (SU-8). The proposed polymer-based optical microscanner with reduced torsional stiffness offers a new approach to increase scanning angles. The scanner consists of two parts; the top layer (micro mirror and electrodes) and the bottom layer (anchors and electrodes). The SU-8 scanner is actuated by electrostatic force generated by gap-closing electrodes. For the fabricated optical scanner with the mirror size of 3 × 3 mm², the experimentally obtained scanning angles were 0.43° for 60 Hz (non-resonant) and 1.54° for 1.13 kHz (resonant) at the input voltage of 160 V. This paper also proposes a simple and new fabrication method, which can effectively control the stiffness of the torsional springs by molding SU-8 photoresist through V-groove on the silicon substrate, thereby increasing the scanning angles.     

高性能计算机电源系统的设计与实现

从系统级、机柜级、板级三方面详细介绍了某高性能计算机电源系统的实现方案。重点介绍了计算板的电源和控制电路的设计方法,并对电源系统的稳定性进行了分析,提出了解决方法,最后给出了系统运行时的电源实测波形。运行结果表明,该系统具有供电质量高,可靠性高,易于维护,能进行故障诊断等优点。     

一种序分量检测新方法

针对传统dq变换法在检测电网序分量时的不足,提出了一种新的序分量检测方法,该方法不仅适用于负载不对称系统,而且适用于电源电压不对称系统.在检测过程中,不需要采用锁相环(PLL)电路获得同步旋转角,有效消除了PLL延时带来的影响;也不需要进行三角函数计算,降低了算法的复杂度.仿真分析表明,本文所提出的方法在电源电压不对称和畸变时能有效检测出负载电流的正序、负序和畸变分量.     

原料润磨对造球和焙烧过程的影响

通过生产试验,研究了原料润磨比对生球强度的影响,在实验室进行了不同温度的焙烧试验,测量了原料不同润磨比时球团矿的常温抗压强度,研究了球团矿氧化焙烧过程中热态强度的变化规律.     

秸秆锅炉驱动超超临界机组给水泵汽轮机经济性分析

以新建超超临界1000 MW机组为例,探讨了采用燃烧秸秆的高压锅炉代替汽轮机抽汽驱动给水泵汽轮机的可行性,并给出燃烧秸秆锅炉蒸汽系统的基本流程.在对机组变工况计算的基础上,分析了采用秸秆锅炉后机组煤耗率的变化以及能够获得的经济效益和环保效益.     

300MW机组烟气脱硫系统可行性分析

石灰石-石膏湿法烟气脱硫工艺是目前世界上较为成熟的脱硫技术,适用于300MW机组.文中综合国内外的调研情况,分析了该设备使用和运行中存在的问题,并结合了解到的先进设计与运行经验,对包头东华热电有限公司国产300MW机组脱硫系统采用“2炉1塔”或“1炉1塔”,以及设置烟气换热器和＂湿烟囱＂的设计原则进行了技术、经济对比与可行性分析.     

机械化学促成可调谐光-电多功能响应二维杂化钙钛矿材料

二维有机-无机杂化钙钛矿因在光伏、光电子等领域的巨大应用潜力而备受关注.此外,该类材料具有突出的结构可调性和材料稳定性,为功能性质的设计调控及器件应用提供了丰富的材料设计平台.然而,将多种物理通道的性质整合实现材料的多功能性仍具有挑战性,而对其进行快速有效的调节更是难上加难.迄今为止,尚未成功实现可调谐的光电多通道响应...     

The Regulatory Roles of Mitochondrial Calcium and the Mitochondrial Calcium Uniporter in Tumor Cells

Mitochondria, as the main site of cellular energy metabolism and the generation of oxygen free radicals, are the key switch for mitochondria-mediated endogenous apoptosis. Ca²⁺ is not only an important messenger for cell proliferation, but it is also an indispensable signal for cell death. Ca²⁺ participates in and plays a crucial role in the energy metabolism, physiology, and pathology of mitochondria. Mitochondria control the uptake and release of Ca²⁺ through channels/transporters, such as the mitochondrial calcium uniporter (MCU), and influence the concentration of Ca²⁺ in both mitochondria and cytoplasm, thereby regulating cellular Ca²⁺ homeostasis. Mitochondrial Ca²⁺ transport-related processes are involved in important biological processes of tumor cells including proliferation, metabolism, and apoptosis. In particular, MCU and its regulatory proteins represent a new era in the study of MCU-mediated mitochondrial Ca²⁺ homeostasis in tumors. Through an in-depth analysis of the close correlation between mitochondrial Ca²⁺ and energy metabolism, autophagy, and apoptosis of tumor cells, we can provide a valuable reference for further understanding of how mitochondrial Ca²⁺ regulation helps diagnosis and therapy.