http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Junhui Zhang,Qun Chao,Bing Xu,Min Pan,Yuan Chen,Qiannan Wang,Ying Li 한국정밀공학회 2017 International Journal of Precision Engineering and Vol.18 No.7
When manufacturing axial piston pumps, mass difference of piston-slipper assembly is inevitable because of manufacturing precision limits. Small mass difference may not cause problems when the pump operates at low speeds, while it cannot be ignored at high speeds. One problem related to high speed is the cylinder block tilt resulting from the inertial effect of piston-slipper assembly. Recently, the speed of electro-hydrostatic actuator (EHA) pump in aircraft can reach more than 10,000 rpm. Therefore, mass difference of pistonslipper assembly should be taken into account in future EHA pump design. The main purpose of this paper is to investigate the effect of the mass difference of piston-slipper assembly on the cylinder block tilt in a high-speed EHA pump. A detailed set of relevant equations is developed to establish the relationship between the mass difference of piston-slipper assembly and cylinder block tilting moment. It is found that a tighter control over the mass difference of piston-slipper assembly should be guaranteed when it comes to high-speed EHA pumps.
Rectifying resistance switching behaviors of SnO2 microsphere films modulated by top electrodes
Rongchun Yuan,Weiwei Xia,Mengxue Xu,Zhilei Miao,Shudong Wu,Xiuyun Zhang,Junhui He,Qiang Wang 한국물리학회 2020 Current Applied Physics Vol.20 No.3
Based on the bipolar resistive switching (RS) characteristics of SnO2 films, we have fabricated a new prototypical device with sandwiched structure of Metal/SnO2/fluorine-doped tin oxide (FTO). The SnO2 microspheres film was grown on FTO glass by template-free hydrothermal synthesis, which was evaporated with various commonly used electrodes such as aluminium (Al), silver (Ag), and gold (Au), respectively. Typical self-rectifying resistance switching behaviors were observed for the RS devices with Al and Au electrodes. However, no obvious rectifying resistance switching behavior was observed for the RS device with Ag electrode. Above results were interpreted by considering the different interface barriers between SnO2 and top metal electrodes. Our current studies pave the ways for modulating the self-rectifying resistance switching properties of resistive memory devices by choosing suitable metal electrodes.
In situ monitoring of pore structure of magnesium oxysulfate cement paste: Effect of MgSO4/H2O ratio
Shengwen Tang,Changrong Wei,Rongjin Cai,Jiasheng Huang,E. Chen,Junhui Yuan 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.83 No.-
This work systematically presented the pore structure evolution of different magnesium oxysulfate(MOS) cement pastes by non-contact impedance measurement (NCIM), fractal theory and othermicrostructural experiments. According to the evolution of electrical impedance response, threehydration stages (dissolution, acceleration and hardened stages) can be identified in the pastes. Furthermore, based on the results obtained from NCIM and fractal theory, the porosity, incremental porevolume, pore tortuosity, average pore diameter and maximal pore diameter of MOS cement pastes areinvestigated. The influence of MgSO4/H2O ratio on pore structure of MOS cement paste is primarilyexplained. It can be inferred from predicted and experimental results that NCIM is a good method toanalyze the microstructure evolution of MOS cement pastes in-situ.