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XiaoMei Zhang,GuoHong Li,Juan Ma,Ying Zeng,PeiJi Zhao,WeiGuang Ma 한국미생물학회 2010 The journal of microbiology Vol.48 No.6
The endophytic fungus Trichothecium roseum LZ93 from Maytenus hookeri was found to antagonize other pathogenic fungi in vitro. To identify which compound contributed substantially to the antagonism, we fermented the strain and purified its fermentation products. Eleven compounds were obtained, including two trichothecenes, five rosenonolactones, two cardiotonic cyclodepsipeptides, and two sterols. Compound 11β-hydroxyrosenonolactone (1) was assigned according to 1D and 2D-NMR data for the first time. At the same time, the 1H and 13C-NMR assignments for 6β-hydroxyrosenonolactone (2) were revised. Of all of them, only trichothecin (6) showed strong antifungal activity. Based on our observations of the antagonistic activity and the other experimental results, we suggest that the antifungal compound trichothecin was the main contributor to the antagonistic action of T. roseum LZ93.
Optimal Timing Control of Discrete-Time Linear Switched Stochastic Systems
Xiaomei Liu,Kanjian Zhang,Shumin Fei,Haikun Wei,Shengtao Li 제어·로봇·시스템학회 2014 International Journal of Control, Automation, and Vol.12 No.4
Optimal switch-time control is the study that investigates how best to switch between different modes. In this paper, we investigate the optimal switch-time control problem for discrete-time linear switched stochastic systems. In particular, under the assumption that the sequence of active subsystems is pre-specified, we focus on the problem where the objective is to minimize a cost functional defined on the states and the switching times are the only control variables. For systems with one switching time, using calculus of variations, we firstly derive the difference formulae of the cost functional with respect to the switching time, which can be directly used to find the optimal switching instant. Then, a method is presented to deal with the problem with multiple switching times case. Finally, the viability of the proposed method is illustrated through two numerical examples.
Xiaomei Zhan,Jifeng Cheng,Li Xiang,Huiju Shao,Shuhao Qin 한국섬유공학회 2021 Fibers and polymers Vol.22 No.5
To obtain the excellent permeate flux, rejection performance and mechanical properties, the chlorinated polyvinylchloride (CPVC) porous membrane was fabricated on the polyethylene terephthalate (PET) non-woven fabric by non-solventinduced phase separation (NIPS), using Tween80 (polyoxyethylene sorbitan monooleate) as a hydrophilic surfactant to regulate themicrostructure of the membrane. Porous skin layer and sub-layer were achieved when 3 wt.% Tween80 was added with asmall amount of deionized water as additive, and internal layer consisted of various finger-like holes. The forming mechanism ofmicrostructures was investigated according to the effects of Tween80 molecular chain structure on the viscosity and surface tensionof casting solution. Significantly, the modified membranes obviously exhibited higher pure water flux, which was increasedby 257 % compared with the pristine membrane. The rejection to ink suspension was over 99 %. Furthermore, the antifoulingperformance of modified membrane was also greatly improved on account of the above microstructure and more hydrophilicsurface. This study provides a new idea for the construction of membrane microstructure and the hydrophilic modification.
ON 2-GENERATING INDEX OF FINITE DIMENSIONAL LEFT-SYMMETRIC ALGEBRAS
Xiaomei Yang,Fuhai Zhu 대한수학회 2017 대한수학회지 Vol.54 No.5
In this paper, we introduce the notion of generating index $\I_1(A)$ ($2$-generating index $\I_2(A)$, resp.) of a left-symmetric algebra $A$, which is the maximum of the dimensions of the subalgebras generated by any element (any two elements, resp.). We give a classification of left-symmetric algebras with $\I_1(A)=1$ and $\I_2(A)=2,3$ resp., and show that all such algebras can be constructed by linear and bilinear functions. Such algebras can be regarded as a generalization of those relating to the integrable (generalized) Burgers equation.
Xiaomei Zhang,Na Liu,Yang Wang 보안공학연구지원센터 2016 International Journal of Security and Its Applicat Vol.10 No.3
In recent years, as the economic continuous development, market competition has been dramatically increasing. In order to maintain competition advantage, enterprises have to seek for more cooperation. As a new model of cooperation, industry strategic alliance is a significant method for cooperation to get competitive advantage, also increasing the rate of innovation. However, due to a variety of factors, part of the alliance is not stable, failure rate is very high. Heilongjiang province soybean processing industry strategic alliance as one of the best agricultural strategic alliance in China, it is also disturbed by it. In order to ensure the healthy and stable development of the alliance, in this paper, we will draw on relevant literature and expert advice, also field visits to the alliance, finding out the factors affecting the stability of the alliance. Then, AHP and fuzzy comprehensive evaluation method are combined to identify high impact factors, and puts forward specific comments based on the factors identified, thereby enhancing the long-term stable development of the alliance. At the same time, it also laid the foundation for the healthy development of other alliances.
Common mode leakage current analysis for Transformerless PV system with long DC side cables
Xiaomei Song,Wenjie Chen,Yang Xuan,Bin Zhang,Jiao Zhang 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6
Due to the advantages of high efficiency and low cost, grid connected inverter based transformerless PV systems have been widespread during the last two decades. The key problem, which arises in absence of galvanic isolation, is the presence of a common mode (CM) leakage current on both AC and DC side of the inverter. In this paper, the influence of long DC side cable to the CM leakage current is taken into account for the first time. Moreover, an improved pai-structure model of the PV panel is proposed. It differs from the traditional single capacitance model in that the panel frame, the mounting rack as well as the connecting wire is all considered. Based upon the proposed model, the common mode leakage current is evaluated in both time domain and frequency domain. Simulation and experimental results give a firm support to the proposed model.
XiaoMei Guo,ZuChao Zhu,BaoLing Cui,GaoPing Shi 대한기계학회 2016 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.30 No.7
Installing an inducer upstream of the main impeller is an effective approach for improving the anti-cavitation performance of a highspeed centrifugal pump. For a high-speed centrifugal pump with an inducer, the number of inducer blades can affect its internal flow and external performance. We studied the manner in which the number of inducer blades can affect the anti-cavitation characteristics and external performance of a centrifugal pump. We first use the Rayleigh-Plesset equation and the mixture model to simulate the vaporliquid flow in a centrifugal pump with an inducer, and then predict its external performance. Finally, we tested the external performance of a centrifugal pump with 2-, 3- and 4-bladed inducers respectively. The results show that the simulations of external performance in a centrifugal pump are in accordance with our experiments. Based on this, we obtained vapor volume fraction distributions for the inducer, the impeller, and in the corresponding whole flow parts. We discovered that the vapor volume fraction of a centrifugal pump with a 3-bladed inducer is less than that of a centrifugal pump with 2- or 4-bladed inducers, which means that a centrifugal pump with a 3-bladed inducer has a better external and anti-cavitation performance.
Xiaomei Qin,Sheng Huang,Yanqing Liu,Mingdi Bian,Wuliang Shi,Zecheng Zuo,Zhenming Yang 한국식물학회 2017 Journal of Plant Biology Vol.60 No.1
Aluminium (Al) toxicity is a primary limitation of crop production in acid soils, which take over 40% of arable soil worldwide. In previous studies, a series of genes have been identified to regulate the plant Al resistance or tolerance. However, none of E3 ubiquitin ligase, the key factor of ubiquitination that plays an important role in plant growth and development, has been characterized for Al response in Arabidopsis. In this study, an E3 ubiquition ligase gene AtATRF1 (Al Tolerance RING Finger 1), a homolog of RAD18 interacting RAD6 to repair the damaged DNA in human and yeast, is isolated from Arabidopsis. It encodes a predicted protein of 296 amino acids with a C3HC4 type RING finger domain. The expression of AtATRF1 is induced by Al, and the transgenic plant overexpressing AtATRF1 enhances the Al tolerance. Similar as RAD18, the AtATRF1 locates in nucleus and regulates the expression of AtATR, which involves in DNA repair and Al response in Arabidopsis. Our results indicate that nuclearlocated AtATRF1 may interact and ubiquitinate the transcriptional regulator of AtATR to mediate the Al tolerance of Arabidopsis.