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A Wireless Controllable Group Lighting System for Electrodeless Fluorescent Lamps
Xian Chao Ma,Hai Xu,Hoon Kim,Hee-Jun Kim,Kyu-Min Cho 대한전기학회 2007 대한전기학회 학술대회 논문집 Vol.2007 No.10
A dimmable ballast system for the electrodeless fluorescent lamp is proposed. The proposed scheme is composed of the electronic ballast and the wireless communication part. They both are realized with one EPLD (Erasable Programmable Logic Device). The dimming levels of each lamps can be controlled by a management system through wireless communication technology. 10 ballasts are used for the group lighting system and the experiment results show the system works well.
Roughness modeling for polishing an aero-engine blade with an abrasive cloth wheel
Chao Xian,Yaoyao Shi,Xiaojun Lin,De Liu 대한기계학회 2020 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.34 No.8
Roughness is a crucial factor that determines workpiece quality. In this paper, the time-domain signals of polishing force for polishing an aero-engine blade with an abrasive cloth wheel were experimentally obtained, and the contact arc lengths were determined based on these signals. A mathematical model for the representative R a of blade surface roughness after polishing was then established, and this model is only related to the contact arc length. This model was experimentally verified, and the prediction results agree well with the measurement results.
Research of Acoustic Emission Testing Method with Application to Monitored for Wind Turbines
Qin Hongwu,Zhang Chao,Zhang Xian,Fan Qinyin 보안공학연구지원센터 2015 International Journal of Multimedia and Ubiquitous Vol.10 No.1
Acoustic Emission method of nondestructive check is based on exertion wave radiation and their registration during fast local material structure reorganization. It is used as a means of analysis of materials, constructions, productions control and diagnosis during operating time. In the article, it is applied to structural health monitoring of Wind Turbines. Acoustic emission testing is based condition monitoring system uses data already collected at the wind turbine controller. It is an effective way to monitor wind turbines for early warning of failures and performance issues. We used a number of measurements to develop anomaly detection algorithms and investigated classification techniques using clustering algorithms and principal components analysis for capturing fault signatures. When registering signal amplitude it is required to consider its frequency distribution connecting each amplitude rate with the corresponding vibration rate. The correlation and signal to noise ratio were evaluated by the algorithm based on frequency spectrum. Classical method of frequency distortion influence exclusion consists of FRF calculation with subsequent adjustment of received signals spectral characteristics.
Chao Wang,Jian-Hui Wang,Shu-Sheng Gu,Xiao Wang,Yu-Xian Zhang 제어·로봇·시스템학회 2017 International Journal of Control, Automation, and Vol.15 No.3
The elongation of steel-strips in annealing furnace is an important factor that affects the position ofwelding line and safety of air-knife since there is no extra space to install welding line detector in field conditions. Therefore, predicting the elongation of steel-strips in the annealing process is important to fulfill the requirementsof eliminating security risks and improving economic performance. In this paper, we propose a deep architecturescalled I-ELM/MLCSA autoencoders with the concept of stacked generalization philosophy to solve large and complexdata mining problems. The comparison results of the case studies indicate that D-ELMs-AE/MLCSA is apromising prediction algorithm and can be employed for steel-strips elongation predictions with excellent performance.
Antimicrobial Constituents from Fruits of Ailanthus Altissima SWINGLE
Chun-Chao Zhao,Jian-Hua Shao,Xian Li,Jing Xu,Peng Zhang 대한약학회 2005 Archives of Pharmacal Research Vol.28 No.10
A new naturally occurring sterol, compound 5, and six known stigmasterols were isolated from fruits of Ailanthus altissima Swingle by repeated column chromatography and RP-HPLC. Their structures were identified as, 5α-stigmastane-3,6-dione (1), 3β-hydroxystigmast-5-en-7-one (2), stigmast-5-ene-3β, 7α-diol (3), 6α-hydroxystigmast-4-en-3-one (4), 5α-stigmastane-3β, 6β- diol (5), stigmast-4-ene-3β, 6α-diol (6), stigmast-5-ene-3β, 7α, 20ξ-triol (7) by spectral analysis and comparison with the published data. These compounds have not been reported from genus Ailanthus, whereas compound 7 was identified by NMR for the first time. In addition, the 95% ethanol extract and compounds from the fruits of Ailanthus altissima SWINGLE were assayed for in vitro antimicrobial activity. The extract was potent active against the assayed bacteria while compounds 3 and 7 exhibited moderate activity.
Research progress of defective MoS2 for photocatalytic hydrogen evolution
Liu Chao,Kong Cui,Zhang Feng-Jun,Kai Chun-Mei,Cai Wei-Qin,Sun Xian-Yang,오원춘 한국세라믹학회 2021 한국세라믹학회지 Vol.58 No.2
The potential application of MoS 2 as a potential H 2 precipitation photocatalyst has received widespread attention and is considered a promising alternative to precious metal cocatalysts due to its richness and low cost. However, the catalytic active center of MoS 2 is only along the edge of the MoS 2 layer. Both theoretical and experimental studies have shown that defect engineering can increase the active site of MoS 2 and has superior activity in catalytic reactions. Therefore, this review describes the nature, defect types, and preparation of defective MoS 2 . Due to the recombination of MoS 2 and semiconductor has specifi c interface characteristics, Schottky heterojunctions can provide accelerated charge separation and lower Schottky barriers for photocatalytic applications, they are eff ective photocatalysts. Therefore, the preparation of the defect MoS 2 -supported semiconductor photocatalyst and its application in the photocatalytic water splitting reaction are also introduced. This article’s profound understanding of defects can consolidate basic photocatalysis theory and provide new insights for the rational design of satisfactory defect engineering photocatalytic materials.
Xuezhi Ding,Chao Yang,Pengjia Bao,Xiaoyun Wu,Jie Pei,Ping Yan,Xian Guo 아세아·태평양축산학회 2019 Animal Bioscience Vol.32 No.12
Objective: As an iconic symbol of Qinghai-Tibetan Plateau and of high altitude, yak are subjected to hypoxic conditions that challenge aerobic metabolism. Matrix metalloproteinases-3 (MMP3) is assumed to be a key target gene of hypoxia-inducible factor-1α that function as a master regulator of the cellular response to hypoxia. Therefore, the aim of this investigation was to identify the DNA polymorphism of MMP3 gene in domestic yak and to explore its possible association with high-altitude adaptation. Methods: The single-nucleotide polymorphisms (SNPs) genotyping and mutations scanning at the MMP3 locus were conducted in total of 344 individuals from four domestic Chinese yak breeds resident at different altitudes on the Qinghai-Tibetan Plateau, using high-resolution melting analysis and DNA sequencing techniques. Results: The novel of SNPs rs2381 A→G and rs4331 C→G were identified in intron V and intron VII of MMP3, respectively. Frequencies of the GG genotype and the G allele of SNP rs2381 A→G observed in high-altitude Pali yak were significantly higher than that of the other yak breeds resident at middle or low altitude (p<0.01). No significant difference was mapped for SNP rs4331 C→G in the yak population (p>0.05). Haplotype GC was the dominant among the 4 yak breeds, and Pearson correlation analysis showed that the frequencies of GC was significantly lower in Ganan (GN), Datong (DT), and Tianzhu white yaks (TZ) compared with Pali (PL) yak. The two SNPs were in moderate linkage disequilibrium in high-altitude yaks (PL) but not in middle-altitude (GN, DT) and low-altitude (TZ) yaks. Conclusion: These results indicate that MMP3 may have been subjected to positive selection in yak, especially that the SNP rs2381 A→G mutation and GC haplotypes might contribute to adaptation for yak in high-altitude environments.
Antimicrobial Constituents from Fruits of Ailanthus Altissima SWINGLE
Zhao Chun-Chao,Shao Jian-Hua,Li Xian,Xu Jing,Zhang Peng The Pharmaceutical Society of Korea 2005 Archives of Pharmacal Research Vol.28 No.10
A new naturally occurring sterol, compound 5, and six known stigmasterols were isolated from fruits of Ailanthus altissima Swingle by repeated column chromatography and RP-HPLC. Their structures were identified as, 5${\alpha}$-stigmastane-3,6-dione (1), 3${\beta}$-hydroxystigmast-5-en-7-one (2), stigmast-5-ene-3${\beta}$, 7${\alpha}$-diol (3), 6${\alpha}$-hydroxystigmast-4-en-3-one (4), 5${\alpha}$-stigmastane-3${\beta}$, 6${\beta}$-diol (5), stigmast-4-ene-3${\beta}$, 6${\alpha}$-diol (6), stigmast-5-ene-3${\beta}$, 7${\alpha}$, 20$\xi$-triol (7) by spectral analysis and comparison with the published data. These compounds have not been reported from genus Ailanthus, whereas compound 7 was identified by NMR for the first time. In addition, the $95\%$ ethanol extract and compounds from the fruits of Ailanthus altissima SWINGLE were assayed for in vitro antimicrobial activity. The extract was potent active against the assayed bacteria while compounds 3 and 7 exhibited moderate activity.