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Genetic-Algorithm-Based Optimization of Dual Stator PM Vernier Machine with Spoke and HTS Bulks
Jing Libing,Kui Zhangtao,Yang Kun,Min Zeyu,Su Zhan,Wang Youzhong 대한전기학회 2023 Journal of Electrical Engineering & Technology Vol.18 No.5
Permanent magnet vernier machine (PMVM) has low speed and high torque characteristics. However, conventional single-rotor single-stator PMVM cannot meet the requirements of a high power factor. In this paper, a dual stator permanent magnet vernier machine (DS-PMVM) with spoke array and high-temperature superconducting (HTS) bulks is proposed to improve the power factor of the PMVM. This model adds HTS bulks between the modulation teeth to effectively suppress the magnetic field penetration, thereby reducing the magnetic flux leakage. A parametric model of DS-PMVM with 16 pole pairs PM rotor and 2 pole pairs armature field is established., and some key parameters are optimized by the genetic algorithm. The electromagnetic performance of the proposed DS-PMVM is verified by comparing with the conventional machine through the finite element simulation, which shows that the torque density of the proposed machine can reach 47.4kN m/m3 and the power factor of 0.946 under the same conditions.
H∞ Filtering for Markovian Jump Linear Systems with Uncertain Transition Probabilities
Xi-Kui Liu,Ji-Jing Zhuang,Yan Li 제어·로봇·시스템학회 2021 International Journal of Control, Automation, and Vol.19 No.7
This paper studies the H∞ filtering problem of stochastic linear systems subject to Markovian jump and multiplicative noise. The transition probabilities are considered to be uncertain. A unified form of filters is constructed for both continuous-time and discrete-time stochastic systems. With the new decoupling technique for the coupling terms between Lyapunov matrices and filtering parameters, sufficient conditions of stochastic stability and H∞ performance of filtering error system are derived. Based on these conditions, the filter is designed with lesscoupling matrices and the filter gain matrices are obtained by calculating a set of linear matrix inequalities. Finally, three examples are presented to test the effectiveness of the obtained method.
Systematic Analysis on the GSTM1 Null Phenotype and Prostate Cancer Risk in Chinese People
Shi, Jing,Zhuang, Yan,Liu, Yan,Yan, Cheng-Quan,Liu, Xian-Kui,Zhang, Ying Asian Pacific Journal of Cancer Prevention 2015 Asian Pacific journal of cancer prevention Vol.16 No.5
Objective: Glutathione S-transferase M 1 (GSTM1) is implicated as a risk factor for prostate cancer. However, this issue is not clear in Chinese population. This systemic analysis was conducted to evaluate the effect of GSTM1 null genotypes on prostate cancer risk in Chinese. Methods: Published studies investigating the associations between GSTM1 null genotypes and the risk of prostate cancer in China were identified by using a predefined search strategy. Main statisticals were pooled and estimated according to the primarily reported data. Results: The prevalence of the GSTM1 null genotype was higher in prostate cancer patients than in controls, with significance. Conclusion: The GSTM1 null genotypes is associated with increased risk of prostate cancer in Chinese.
Silencing of PDK1 Gene Expression by RNA Interference Suppresses Growth of Esophageal Cancer
Yu, Jing,Chen, Kui-Sheng,Li, Ya-Nan,Yang, Juan,Zhao, Lu Asian Pacific Journal of Cancer Prevention 2012 Asian Pacific journal of cancer prevention Vol.13 No.8
The current study was conducted to explore the inhibitory effects of a small interfering RNA (siRNA) on 3-phosphoinositide-dependent protein kinase 1 (PDK1) expression in esophageal cancer 9706 (EC9706) cells and the influence on their biological behavior. After transfection of a synthesized PDK1 siRNA, PDK1 mRNA and protein expression and the phosphorylation level of the downstream Akt protein were assessed using RT-PCR and Western blot analysis. Proliferation, apoptosis, cell invasion and in vivo tumor formation capacity were also investigated using MTT, flow cytometry, Transwell invasion trials, and nude mouse tumor transplantion, respectively. PDK1 siRNA effectively suppressed PDK1 mRNA and protein expression, and down-regulated the phosphorylation level of the Akt protein in the EC9706 cells (P < 0.05). It also inhibited cell proliferation and invasion, and promoted apoptosis; such effects were particularly obvious at 48 h and 72 h after transfection (P < 0.05). Growth of transplanted tumors was inhibited in nude mice, with decreased PDK1 expression in tumor tissues. PDK1 may be closely correlated with proliferation, apoptosis and invasion of esophageal cancer cells and thus may serve as an effective target for gene therapy.
Zhikun Zhang,Ying Zhou,Jing-Kui Yang,Peilong Wang,Xiaoou Su,Hong Zhao,Yujian He,Zhiqin Cao,Maoqiang Luo 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2015 NANO Vol.10 No.7
A new method has been proposed to realize the visual detection of Cr3+ using 4-nitrobenzenethiol (4-NBT) and 4-mercaptobenzoic acid (4-MBA) modified silver nanoparticles (AgNPs). The presence of Cr3+ induces the aggregation of AgNPs through cooperative metal–ligand interaction, resulting in a color change from bright yellow to purple. Consequently, Cr3+ could be monitored by colorimetric response of AgNPs by a UV-Vis spectrophotometer or even naked eyes. We firstly used ethylene diamine tetraacetic acid (EDTA) as a masking agent to selectively detect Cr3+, and other metal ions have little influence on the Cr3+–AgNPs system. The cofunctionalized AgNPs exhibited a highly sensitive detection limit of Cr3+, which is as low as 5 x 10-9 mol L-1, and the absorbance ratio (A600nm /A387nm) is linear with the concentration of Cr3+ ranging from 5 x 10-9 mol L-1 to 2 x 10-6 mol L-1 with a coefficient of 0.993. Particularly, the sensor has been further evaluated to monitor the concentration of Cr3+ in drinking water, the recovery was in good agreement with those obtained by ICP-MS, indicating that this proposed method is successfully applied in real samples.
Zhao, Tai-Yun,Tu, Jing,Wang, Yin,Cheng, Da-Wei,Gao, Xian-Kui,Luo, Hao,Yan, Bi-Chun,Xu, Xiao-Li,Zhang, Hong-Ling,Lu, Xing-Jun,Wang, Yao-Jun Asian Pacific Journal of Cancer Prevention 2016 Asian Pacific journal of cancer prevention Vol.17 No.5
Background: Through search the possible randomized control trials, we make a renewed meta-analysis in order to assess the impact of aspirin in preventing the recurrence of colorectal adenoma. Materials and Methods: The Medicine/PubMed, Embase, Cochrane Central Register of Controlled Trials (CENTRAL), Chinese biomedical literature service system (SinoMed) databases were searched for the related randomized controlled trials until to the April 2016. Three different authors respectively evaluated the quality of studies and extracted data, and we used the STATA software to analyze, investigate heterogeneity between the data, using the fixed-effects model to calculate and merge data. Results: 7 papers were included the renewed meta-analysis, among these studies, two pairs were identified as representing the same study population, with the only difference being the duration of follow-up. Thus there were only five papers included our meta-analysis, and one Chinese paper were also included the work. Results were categorized by the length of follow-up, different kinds of people, varied dose of oral aspirin. The relative of adenoma in patients taking aspirin vs placebo were 0.73 (95% CI 0.55-0.98, P=0.039) with 1 year follow up; 0.84 (95% CI 0.72-0.98, P=0.484) with greater than 1 year follow up; for the advanced adenoma, the RR 0.68 (95% CI 0.49-0.94, P=0.582),for one year; RR=0.75 (95% CI 0.52-1.07, P=0.552) for greater one year. Furthermore the white population could divided into two subgroups according to the different length of follow-up time. When the length of follow-up time less than 3-year, The RR of two subgroups respective were RR=0.86 (95% CI 0.76-0.98, P=0.332), $I^2=0%$, RR=0.68 (95% CI 0.47-0.98, P=0.552), $I^2=64.6%$, But with the extension of follow-up time greater than 2-year, with the white, oral aspirin without considering dose had no efficacy on preventing the recurrence of any adenoma, the RR was 0.86 (95% CI 0.71-1.05, P=0.302), $I^2=16.4%$. Conclusions: This meta-analysis indicated that oral aspirin is associated with a remarkable decrease in the recurrence of any adenoma and advanced adenomas in patients follow-up for 1 year without concerning the dose of aspirin, but with the extension of follow-up time for greater than 1 year, oral aspirin can be effective on preventing the recurrence of any adenoma, but for the advanced adenoma, the result indicated that oral aspirin had no efficacy, According to the inclusion of ethnic groups, we also divided relevant papers into two subgroups as the yellow and white group. Then the follow-up time was less than 3 years, oral aspirin without considering the dose, had an significant efficacy on preventing the recurrence of any adenoma. But with the follow-up greater than 2 years, oral aspirin had no effect in the white.
( Tong Hui Xie ),( Jing Liu ),( Kai Feng Du ),( Bin Liang ),( Yong Kui Zhang ) 한국미생물 · 생명공학회 2013 Journal of microbiology and biotechnology Vol.23 No.10
Microalgal biofuel production from wastewater has economic and environmental advantages. This article investigates the lipid production from high chemical oxygen demand (COD) bioethanol wastewater without dilution or additional nutrients, using a newly isolated heterotrophic microalga, Chlorella vulgaris LAM-Q. To enhance lipid accumulation, the combined effects of important operational parameters were studied via response surface methodology. The optimal conditions were found to be temperature of 22.8oC, initial pH of 6.7, and inoculum density of 1.2 × 108 cells/ml. Under these conditions, the lipid productivity reached 195.96 mg/l/d, which was markedly higher than previously reported values in similar systems. According to the fatty acid composition, the obtained lipids were suitable feedstock for biodiesel production. Meanwhile, 61.40% of COD, 51.24% of total nitrogen, and 58.76% of total phosphorus were removed from the bioethanol wastewater during microalgal growth. In addition, 19.17% of the energy contained in the wastewater was transferred to the microalgal biomass in the fermentation process. These findings suggest that C. vulgaris LAMQ can efficiently produce lipids from high-concentration bioethanol wastewater, and simultaneously performs wastewater treatment.