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- 저자 : Hongjiang Wu (검색결과 4 건)
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The solids concentration distribution in the deep cone thickener: A pilot scale test
Hongjiang Wang,Huazhe Jiao,Aixiang Wu,Shuiping Zhong,Renman Ruan,ShengHua Yin 한국화학공학회 2013 Korean Journal of Chemical Engineering Vol.30 No.2
Cemented backfill or surface deposition of paste tailings is increasingly being considered as a simple and effective means of reducing the hazards of conventional slurry deposition and recovering water for recycle. Although gravity thickening has been widely used in the mineral industry to increase the solids concentration of tailings, the accurate prediction of the concentration distribution in three-dimensions and discontinuous operational state has proven to be difficult. We investigated the axial and radial solids concentration distribution at discontinuous state in a pilot deep cone thickener as a function of bed height and residence time. The feed flux of lead/zinc tailings was 0.254 t·h−1·m−2 with a flocculant (high molecular weight anionic polyacrylamide) dose of 20 g/t. The thickened solids bed was sheared by a rotating rake at a rate of 0.2 rpm. The underflow was recirculated at a flux of 0.5 t·h−1·m−2, which can introduce additional shear stresses into the bed. The results of the bed density profile showed that, beside the clarification zone, the area below the feedwell could be divided into four zones: the dilution zone caused by free settling and diffusing action, the hindered settling zone in which the concentration was lower than the gel point, the unraked bed zone with a large concentration gradient and, finally, the raking zone with the highest slurry concentration and lower concentration gradient.
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Jicheng Zhou,Shiqi Yu,Xiaowei Guo,Liang Wu,Hongjiang Li 한국물리학회 2019 Current Applied Physics Vol.19 No.2
Quaternary stannite semiconductor Cu2FeSnS4 (CFTS), which is an ideal material for solar photovoltaic cells, has attracted widespread attention. CFTS crystals have been successfully synthesized by the co-electrochemical deposition method. The structure, morphology, and composition of as-synthesized samples were characterized by using X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectrometer (EDS), respectively. From the results, it was found that the properties of the sample can be improved by tuning the Cu2+ concentration in the electrolyte, and the best sample was obtained with the Cu2+ concentration of 0.01 M. For the best sample, the CFTS thin films have single phase and good crystallinity with even particle size. By the addition of ascorbic acid, an effective way has been found to enhance the Fe content in the sample, and the reason for the Fe-poor phenomenon has also been explored.
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Development of a 120 Hz 110 ultra-high-definition a-Si liquid crystal display panel
Yanping Liao,Xibin Shao,Yufan Du,송용지,Weihao Hu,Zhenyu Zhang,Yuqiong Chen,Ying Wang,Qing Ma,윤대근,Dan Wang,Jianfeng Yuan,Hongjiang Wu,Zongjie Guo,Zhaohui Hao,Ji Zhang,Jing Lv 한국정보디스플레이학회 2014 Journal of information display Vol.15 No.2
A prototype 120 Hz 110-inch ultra-high-definition a-Si liquid crystal display (LCD) panel was successfully developed using the BOE exclusive advanced superdimensional switching technology. This LCD has a panel consisting of 3840 × 2160 pixels, four times the number of pixels in the conventional full-high-definition LCD. For the brightness and contrast ratio, 1000 nits and 1200:1 have been achieved, respectively. Additionally, the liquid crystal charging time has been extended through quad area driving and 2G2D line structures. Furthermore, the local dimming and mirror-scanning techniques are applied to realize excellent image display. Finally, the system utilizes 3D shutter glasses, allowing the viewer to achieve the highest sense of realness and immersion.
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A flow rate on-line monitoring method for piezoelectric pump based on self-sensing circuit
Hong Jiang,Guohui Wu,Lipeng He,Yuecheng Wang,Dianbin Hu,Zheng Zhang,Guangming Cheng 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.5
This paper presents a new flow rate monitoring method for a piezoelectric micropump based on a self-sensing circuit. Utilizing the voltage generated by the secondary direct piezoelectric effect as the sensing voltage, a soft sensor of the piezoelectric actuator can be implemented onto the piezoelectric micropump. A bridge-type circuit is proposed as the selfsensing circuit, the piezoelectric micropump is fabricated with a circular piezoelectric actuator, the characteristics of the self-sensing voltage and the flow rate are experimentally investigated under different excitation voltages and frequencies. The results show that the method can accurately determine optimal frequency of the micropump (100 Hz, 280 Hz), and for a fixed frequency of 100 Hz and a voltage range of 50-180 V, the correlation between the self-sensing voltage and the flow rate is 0.9732. As a result, the method demonstrated in this paper allows precise monitoring of the flow rate of the piezoelectric micropump without using external sensors.
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