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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.
Decoupling Control of Penicillin Fermentation Processes Based on MLS-SVM Inversion
Bo Wang,Xiaofu Ji,Zhikun Zhuang 보안공학연구지원센터 2016 International Journal of Multimedia and Ubiquitous Vol.11 No.4
Specific to typical multi-variable, strong-coupling and nonlinear penicillin fermentation process, by combination of an inverse system method and a support vector machine theory, a nonlinear robust decoupling control method based on MLS-SVM inversion is proposed. Firstly, a dynamic system model is developed based on material balance relation of fed-batch fermentation process, and existence of inverse system is analyzed. Secondly, an inverse model has been developed offline by use of fitting capacity of MLS-SVM; online correction was made by use of differential evolution (DE) algorithm on the basis of deviation information. Finally, to connect the inverse model and original system in serial into a compound pseudo-linear system, and based on characteristics of pseudo-linear system, introduce internal model controller for closed-loop control of the system. Simulation result shows that such control method can realize dynamic decoupling control of penicillin fermentation process; the system boasts very strong parameter robustness and good resistance against interference
Identification of the WRKY gene family in apricot and its response to drought stress
Jing Chenjuan,Wang Duan,Liu Zhikun,Chen Xuefeng,Dong Hui,Wu Xiaohong 한국원예학회 2023 Horticulture, Environment, and Biotechnology Vol.64 No.2
The WRKY family has been found in 14 plant species, and its members are mostly involved in plant stress resistance. Apricot ( Prunus armeniaca L.) trees are extremely drought tolerant, but the molecular mechanisms have not yet been elucidated. Therefore, we investigated the WRKY gene family in apricot and analyzed the gene expression patterns in response to drought stress. A total of 56 candidate WRKY genes (PaWRKY1–56 ) were identifi ed in the apricot genome. The putative proteins contain 162–1055 amino acids, with an isoelectric point of 5.0–9.68 and molecular weight of 18.76– 114.2 Da. The PaWRKY family has a heptapeptide domain (WRKY) and zinc fi nger domain (CX 5-7 CX 22-23 HXH), which show diff erential variations among three groups. Group I has 12 members, with 2 WRKY and zinc fi nger domains located at the C and N terminus, respectively. Group II can be further divided into II-b, II-c, II-d, and II-e, with 10, 13, 6, and 7 members, respectively. Group III has eight members. Members of groups II and III have one WRKY and one zinc fi nger domain. Fifty-one PaWRKY genes are unevenly distributed across eight linkage groups. Only one tandem repeat event was detected, and gene duplication was identifi ed as the main factor driving gene evolution. A total of 28 PaWRKY genes responded to the drought–rehydration treatment. In particular, drought stress up-regulated PaWRKY11/14/48 expression and down-regulated PaWRKY23 expression. The genome-wide identifi cation, functional characterization, and evolution- ary analysis of the PaWRKY family yield new insights into the role of WRKY in the drought tolerance of apricot trees.
Pengfei Cheng,Yutian Wang,Zhikun Chen,Zhe Yang 한국광학회 2016 Current Optics and Photonics Vol.20 No.1
Oil pollution seriously endangers the biological environment and human health. Due to the diversityof oils and the complexity of oil composition, it is of great significance to identify the oil contaminants. The 3-D fluorescence spectrum combined with a second order correction algorithm was adopted to measurean oil mixture with overlapped fluorescence spectra. The self-weighted alternating trilinear decomposition(SWATLD) is a kind of second order correction, which has developed rapidly in recent years. Micellarsolutions of #0 diesel, #93 gasoline and ordinary kerosene in different concentrations were made up. The3-D fluorescence spectra of the mixed oil solutions were measured by a FLS920 fluorescence spectrometer. The SWATLD algorithm was applied to decompose the spectrum data. The predict concentration andrecovery rate obtained by the experiment show that the SWATLD algorithm has advantages of insensitivityto component number and high resolution for mixed oils.
SOC and SOH Joint Estimation of Lithium-Ion Battery Based on Improved Particle Filter Algorithm
Wu Tiezhou,Liu Sizhe,Wang Zhikun,Huang Yiheng 대한전기학회 2022 Journal of Electrical Engineering & Technology Vol.17 No.1
In order to improve the estimation accuracy of the state of charge (SOC) of lithium ion batteries and accurately estimate the state of health (SOH), this paper proposes an improved fi refl y algorithm to optimize particle fi lter algorithm to estimate the SOC and SOH of lithium batteries. Aiming at the particle degradation problem of the traditional sequential importance sampling in the standard particle fi lter algorithm, the improved fi refl y algorithm is used to replace the re-sampling of the traditional particle fi lter to suppress the particle depletion during the execution of the standard particle fi lter algorithm; Establishing a second-order RC equivalent circuit model and use the recursive least square method with forgetting factor to identify relevant battery parameters. The ohmic resistance is regarded as a characteristic parameter of the battery state of health (SOH), and the battery SOH is estimated on this basis. IFA-PF algorithms are used for the joint estimation of SOC and SOH. Through simulation verifi cation under DST conditions, the accuracy of using the improved particle fi lter algorithm to estimate battery SOC is within 2%, with an average error of 0.81%, and its SOH estimation accuracy remains at about 2%, with an average error of 1.34%, which proves the superiority of the joint estimation algorithm
Antioxidant activity and metabolic regulation of sodium salicylate on goat sperm at low temperature
Shen Wenzheng,Fu Yu,Bai Haiyu,Zhang Zhiyu,Cao Zhikun,Liu Zibo,Yang Chao,Sun Shixin,Wang Lei,Ren Chunhuan,Ling Ying-hui,Zhang Zi Jun,Cao Hongguo 아세아·태평양축산학회 2024 Animal Bioscience Vol.37 No.4
Objective: The purpose of this study was to explore the effect of sodium salicylate (SS) on semen preservation and metabolic regulation in goats. Methods: Under the condition of low temperature, SS was added to goat semen diluent to detect goat sperm motility, plasma membrane, acrosome, antioxidant capacity, mitochondrial membrane potential (MMP) and metabonomics. Results: The results show that at the 8th day of low-temperature storage, the sperm motility of the 20 μM SS group was 66.64%, and the integrity rates of the plasma membrane and acrosome were both above 60%, significantly higher than those of the other groups. The activities of catalase and superoxide dismutase in the sperm of the 20 μM SS group were significantly higher than those of the control group, the contents of reactive oxygen species and malondialdehyde were significantly lower than those in the control group, the MMP was significantly higher than that in the control group, and the contents of Ca2+ and total cholesterol were significantly higher than those in the control group. Through metabonomics analysis, there were significant metabolic differences between the control group and the 20 μM SS group. Twenty of the most significant metabolic markers were screened, mainly involving five metabolic pathways, of which nicotinic acid and nicotinamide metabolic pathways were the most significant. Conclusion: The results indicate that SS can effectively improve the low-temperature preservation quality of goat sperm.