Results 21 to 30 of about 4,690 (128)
Study on Self-Generating Suppressor for Ion Chromatography [PDF]
, 2006 抑制器作为双柱离子色谱法的核心部件之一，其作用是降低淋洗液背景电导，增强样品信号，使检测限降低一至两个数量级，达到样品离子的高灵敏检测。抑制器的研究是离子色谱发展的一个重要领域，迄今已超过三十年的历史，共经过三个阶段：填充柱抑制器，化学连续再生抑制器和电自生抑制器。文献中关于抑制器研究的报道只限于其工作原理和性能测试。本论文从抑制器的设计原则出发，研制出高性能电自生离子色谱抑制器，并深入讨论抑制器的结构与性能之间的关系。本论文共分为四章，讨论抑制器的结构设计，提出高性能电自生离子色谱抑制器的设计方案 ...
黄维雄
core
Rare Metals, Volume 45, Issue 2, February 2026.ABSTRACT Photocatalytic molecular oxygen (O2) activation provides a sustainable approach to produce singlet oxygen (1O2) for organic contaminants detoxification. However, the charge carriers‐involved pathway usually suffers from unsatisfactory 1O2 production efficiency owing to energy loss caused by photogenerated hole‐mediated superoxide species (•O2−
Yan‐Biao Shi +8 more
wiley +1 more source
Dianci bileiqi, 2004 为了提高电涌保护器中压敏电阻的耐电流冲击性能,可采用压敏电阻的并联组合。通过对并联组合后的压敏电阻电性能的分析,认为电流偏差是由于限制电压不相等（Ua1≠Ua2）和动态电阻不相等（Rz1≠Rz2）两个因素造成的,且动态电阻越大,电流偏差越小。压敏电阻并联时,可取限制电压Ua相等,而动态电阻Rz相差不超过规定值;也可取动态电阻Rz相等,限制电压Ua相差不超过规定值,使电流偏差在10%范围内。
王茂华, 胡克鳌, 张南法
doaj
The Design of Precision Photoelectric Circuit in Micro Displacement Detection System [PDF]
, 2010 基于像散原理的光学检测系统,是通过对光路系统聚焦信号的离焦量fES的检测实现微位移的测量。四象限光电探测器作为检测系统的光电转换传感器,需要设计光电探测器电路,实现对fES信号的检测,并由微单片机系统采集处理,通过串口通信传给PC机进行数据存储和被测对象二维图像分析和重建。通过将所设计的电路集成在光学测头装置上进行实验测量,光电转换信号稳定,相对误差小于5%。The optical detection system based on the principle of astigmatic to ...
周小英, 张建寰, 苏君平
core
Rare Metals, Volume 45, Issue 2, February 2026.ABSTRACT Ni3S2 has emerged as a promising catalyst for the electrochemical oxidation of biomass‐derived 5‐hydroxymethylfurfural (HMF) to 2,5‐furandicarboxylic acid (FDCA), driven by its distinctive physicochemical properties. However, its practical catalytic efficiency is severely hindered by abundant electrochemically inactive surface sites and poor ...
Cheng‐Feng Yi +5 more
wiley +1 more source
Gaoya dianqi, 2019 在实际的列车运行过程中压力载荷是以正弦形式波动变化,波动载荷对弓网系统中的接触电阻特性有重要影响。文中利用销盘式高速载流摩擦磨损实验机模拟弓网系统中的压力波动状态,研究了波动载荷、滑动速度和接触电流对动态接触电阻特性的影响,结合表面形貌对其变化规律产生的原因进行了分析。结果表明:载流滑动接触且压力波动频率一定时,动态接触电阻随压力波动幅度的增大先减小后增大;压力波动幅度一定时,动态接触电阻随压力波动频率的增大而缓慢增大;波动载荷条件下,动态接触电阻随滑动速度的增大而逐渐增大,随接触电流的增大而逐渐减小 ...
陈忠华 +4 more
doaj
Study on Turbocharger Rotor Axial Thrust Test in Start and Stop Process [PDF]
, 2012 涡轮增压器起动和停机过程转子所受的轴向力大小对于增压器的设计是至关重要的。以JP60C型涡轮增压器为研究对象,利用有限元方法计算增压器止推轴承的应变场,确定了转子轴向力的测量方案。并在增压器性能试验台上对增压器转子轴向力进行实验测量。实验结果表明,增压器起动和停机时,止推轴承所承受的轴向力远大于稳定工作时所承受的轴向力;且起动和停机工况下,转子所受的轴向力方向相反。试验结果将为增压器止推轴承的合理设计提供理论依据。One of the most challenging aspects in ...
洪汉池, 胡辽平, 黄红武
core
Application and Prospects of Electrical Impedance Tomography in Perioperative Brain Imaging Monitoring [PDF]
Electrical impedance tomography (EIT) represents an emerging medical functional imaging technology, which operates by applying safe-to-human excitation currents through surface-mounted electrodes, measuring boundary voltages between electrodes, and ...
Chenhui LI +4 more
core +1 more source
Rare Metals, Volume 45, Issue 2, February 2026.ABSTRACT The transformative potential of gallium nitride high electron mobility transistors (GaN HEMTs) in advancing carbon‐neutral power systems remains bottlenecked by contact resistance (Rc) at the metal–semiconductor (M‐S) interface, a critical determinant of switching losses and frequency response.
Ji‐Zhou Zhang +8 more
wiley +1 more source
Rare Metals, Volume 45, Issue 2, February 2026.ABSTRACT With the continuous advancement of materials science and technology, the rare metal gallium has increasingly emerged as a promising alternative to the toxic metal mercury. Although existing research has predominantly focused on the high electrical conductivity and excellent deformability of liquid metal (LM), its intrinsic fluidic property ...
Feifan Guo +6 more
wiley +1 more source