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Vibration analysis and dynamic performance improvement of high-frequency injection method
Peng, Wei,Qiao, Mingzhong,Jiang, Chao,Lu, Xihao,Zhu, Peng The Korean Institute of Power Electronics 2021 JOURNAL OF POWER ELECTRONICS Vol.21 No.2
This paper analyzes and compares the typical rotating high-frequency voltage injection (RTHF) method and the typical pulsating high-frequency voltage injection (PSHF) method in terms of torque ripple and vibration. Analysis and experiment results indicate that the PSHF performs better when it comes to torque pulsation and vibration. In addition, it is more suitable for rim motors which have strict restrictions on vibration. However, the estimated rotor position in PSHF has multiple convergence points. In addition, the filters used in PSHF can degrade the dynamic response of the PMSM sensorless field oriented control (SLFOC) system. An improved PSHF method compensated by Hall signals is proposed to accelerate the estimation process and improve the system stability in the presence of sudden load disturbances. The improved method is verified on an 11 kW rim motor experimental platform.
Lu Lu,Jia Li,Dickon H.L. Ng,Ping Yang,Peng Song,Min Zuo 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.46 No.-
Hierarchically porous Fe3O4@MgAl–LDH magnetic microspheres were reported as novel efficientadsorbent for the removal of anionic dye from water. The as-prepared microspheres had vertically/slantly/horizontally oriented platelets-coated morphology, and exhibited superb adsorption capacity of813.0 mg/g for Congo red (CR), which was the highest reported value of magnetic adsorbents. Theadsorption kinetics and isotherm of CR on microspheres followed the pseudo-second-order andLangmuir model, respectively, and the adsorption processes were spontaneous and endothermic innature. The adsorbed samples could be regenerated by methanol, and easily magnetically separated fromaqueous solution. The synthesized materials might act as excellent adsorbents for environmentalprocesses.
Lu Peng,Ren Liang 아시아사회과학학회 2021 Jornal of Asia Social Science Vol.3 No.3
Starting from the analysis of the crimes and endings of many monsters, it can be found that the stories in Journey to the West contain rich cultural connotations, and the world of deities and demons is also a reflection of the real world under the Chinese imperial power system. The various social relationships of monsters are the reflections of various interpersonal relationships in reality, and the basis for the construction of their social relationships is the principle of blood relationship in the real society. The establishment of the principle of constructing social relations based on kinship is inseparable from the small peasant economy under the traditional Chinese imperial power system.
Lu, Peng,Chen, Keping,Yao, Qin,Yang, Hua-Jun Korean Society of Sericultural Science 2007 International Journal of Industrial Entomology Vol.15 No.2
As the genome of B.mori is available in GenBank and the EST database of B.mori is expanding, identification of novel genes of B.mori is conceivable by data-mining techniques. We used the in silico cloning method to get the vacuolar-type $H^+-ATP$ synthetase (V-ATPase) c subunit (16 kDa proteolipid subunit) gene of B.mori and analysed with bioinformatics tools. The result was confirmed by RT-PCR and sequencing. The V-ATPase c subunit cDNA contains a 468 bp ORF. The ORF encoded a 155-residue protein that showed extensive homology with V-ATPase c subunits from other 15 species and contained four membrane-spanning helices. Tissue expression pattern analysis revealed that V-ATPase c expressed strongly in Malpighian tubules, not in fat body. This gene has been registered in GenBank under the accession number EU082222.
Functional Analysis of B7-H3 in Colonic Carcinoma Cells
Lu, Peng,Liu, Rong,Ma, Er-Min,Yang, Tie-Jian,Liu, Jia-Lin Asian Pacific Journal of Cancer Prevention 2012 Asian Pacific journal of cancer prevention Vol.13 No.8
B7-H3 is a newly discovered member of the B7/CD28 superfamily which functions as an important T-cell immune molecule. It has been reported recently that B7-H3 is highly expressed in many cancer cells, the data indicating that it may be a regulation factor contributing to tumor-resistance. In our study, we used bioinformatics to identify differentially expressed genes between colonic cancer cells and normal colonic cells, aiming to analyze mechanisms and identify sub-pathways closely related to progression, with the final aim of finding small molecule drugs which might interfere this progression. We found that ajmaline is one related factor which may enhance self-immunity in colon carcinoma therapy and B7-H3 plays important roles with regard to immunoreactions of colonic cancer cells. All the results indicate that H7-B3 is a favorable prognostic biomarker for colon carcinomas, providing novel information regarding likely targets for intervention.
The Entrainment Effect of a Debris Avalanche on the Erodible Substrate in the Presence of Water Flow
Peng-yuan Lu,Xing-guo Yang,Jia-wen Zhou 대한토목학회 2018 KSCE JOURNAL OF CIVIL ENGINEERING Vol.22 No.1
Debris avalanches generally entrain the erodible deposits on their runout path, which can greatly influence their movement process, particularly in the presence of water flow. To study the entrainment effect of debris avalanches, physical modeling experiments were conducted that considered the impact of hopper elevation, the grain size of substrate materials and water flow. The experiment results indicate that the materials entrained by a debris avalanche increase with an increase in elevation of the hopper and particle size of the substrate materials in the rear region of the substrate. The presence of water flow can magnify the entrainment effect and enhance the mobility of the debris avalanche. However, the effect of water flow on the entrainment effect is significantly related to the grain size of the deposits. With a decrease in grain size, a water stream is easier to generate, which can cause intense scouring of the substrate materials and enhance the mobility of the mixed flow of debris and entrained deposits, ultimately leading to a greater affected area.
Lu Peng,Wu Nan 아시아사회과학학회 2022 Jornal of Asia Social Science Vol.7 No.1
In the context of cultural industry, ethnic regions have made their own unique ethnic cultures into “cultural business cards”. For the ethnic areas on the frontier, the industrialization of ethnic culture provides them with an opportunity to enter the mainstream social vision. More importantly, the industrialization of ethnic culture provides them with opportunities to expand their social contacts and show their cultural rationality.
Theoretical analysis of Y-shape bridge and application
Lu Peng-zhen,Zhang Jun-ping,Zhao Ren-da,Huang Hai-yun 국제구조공학회 2009 Structural Engineering and Mechanics, An Int'l Jou Vol.31 No.2
Mechanic behavior of Y-shape thin-walled box girder bridge structure is complex, so one can not exactly hold the mechanical behavior of the Y-shape thin-walled box girder bridge structure through general calculation theory and analytical method. To hold the mechanical behavior better, based on elementary beam theory, by increasing the degree of freedom analytical method, taking account of restrained torsiondistortion angledistortion warp and shearing lag effect at the same time, authors obtain a thin-walled box beam analytical element of 10 degrees of freedom of every node, derive stiffness matrix of the element, and code a finite element procedure. In addition, authors combine the obtained procedure with spatial grillage analytical method, meanwhile, they build a new analytical method that is the spatial thin-walled box girder element grillage analysis method. In order to validate the precision of the obtained analysis method, authors analyze a type Y-shape thin-walled box girder bridge structure according to the elementary beam theory analytical method, the shell theory analytical method and the spatial thin-walled box girder element grillage analysis method respectively. At last, authors test a type Y-shape thin-walled box girder bridge structure. Comparisons of the results of theory analysis with the experimental text show that the spatial thin-walled box girder element grillage analysis method is simple and exact. The research results are helpful for the knowledge of the mechanics property of these Y-shape thin-walled box girder bridge structures.
Vertical Mixed Jet Behavior of Orifice Nozzle
Peng, Lu,Kim, Dong Jun,Yang, Hei Cheon Trans Tech Publications, Ltd. 2014 Advanced materials research Vol.1070 No.-
<P>The objective of this study is to experimentally investigate the mixed jet and oxygen transfer behavior of a vertical orifice nozzle. The experimental apparatus consisted of an electric motor-pump, an orifice nozzle, a circulation water tank, an air compressor, a high speed camera unit and controlling or measuring accessories. The entrainment ratio was calculated using the measured primary fluid flow rate and suction air flow rate with primary flow pressure. The visualization image of vertically injected air and mixed jet issuing from the orifice nozzle was analyzed qualitatively. As the air compressor pressure increases, the penetration length of mixed jet decreases and the mass ratio and dissolved oxygen concentration increase.</P>