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Zhi-Bin Hu,He-An Luo,Xiao-Guang Wang,Ming-Zhi Huang,Lu Huang,Huai-Lin Pang,Chun-Hui Mao,Hui Pei,Chao-Qun Huang,Jiong Sun,Ping-Le Liu,Ai-Ping Liu 대한화학회 2014 Bulletin of the Korean Chemical Society Vol.35 No.4
In attempt to lead compounds exhibiting both insecticidal and fungicidal activities, a series of O-benzyl oximeether derivatives were designed and synthesized by introducing β-methoxyacrylate pharmacophore into a scaffold. The insecticidal activity against Aphis fabae and the fungicidal activity against Erysiphe graminis were screened. The title compounds exhibited remarkable insecticidal and fungicidal activities. The most potent compound 6d was identified. Its insecticidal LC50 against A. fabae is 6.4 mg/L, which is lower than that of chlorfenapyr (19.4 mg/L) and even close to the level of imidacloprid (4.8 mg/L). Its fungicidal EC90 in preventive and curative treatment against E. graminis are 2.2 and 4.8 mg/L, respectively, which are lower than azoxystrobin (7.0 and 5.9 mg/L). These results indicate that compound 6d can be considered as a lead for further developing new O-benzyl oxime-ether typed candidates with both fungicidal and insecticidal activities.
The effects of LNG-tank sloshing on the global motions of FLNG system
Zhi-Qiang Hu,Shu-Ya Wang,Gang Chen,Shu-Hong Chai,Yu-Ting Jin 대한조선학회 2017 International Journal of Naval Architecture and Oc Vol.9 No.1
This paper addresses a study of inner-tank sloshing effect on motion responses of a Floating Liquefied Natural Gas (FLNG) system, through experimental analysis and numerical modeling. To investigate hydrodynamic characteristics of FLNG under the conditions of with and without LNG-tank sloshing, a series of numerical simulations were carried out using potential flow solver SESAM. To validate the numerical simulations, model tests on the FLNG system was conducted in both liquid and solid ballast conditions with 75% tank filling level in height. Good correlations were observed between the measured and predicted results, proving the feasibility of the numerical modeling technique. On the verified numerical model, Response Amplitude Operators (RAOs) of the FLNG with 25% and 50% tank filling levels were calculated in six degrees of freedom. The influence of tank sloshing with varying tank filling levels on the RAOs has been presented and analyzed. The results showed that LNG-tank sloshing has a noticeable impact on the roll motion response of the FLNG and a moderate tank filling level is less helpful in reducing the roll motion response.
An Efficient Multi-PCA Based On-line Monitoring Scheme for Multi-Stages Imperial Smelting Process
Zhi-kun Hu,Zhi-wen Chen,Wei-Hua Gui,Chun-hua Yang,Lin-zi Yin,Xiao-qi Peng 제어·로봇·시스템학회 2013 International Journal of Control, Automation, and Vol.11 No.2
Imperial Smelting Process (ISP) is one of the main methods for Zinc and Lead smelting. In this paper, we firstly focus on its unique characteristics that ISP consists of many feeding cycles repeated in a similar way, and the normal process changes and multiple operating conditions would be frequently found in the process which would always lead to false alarms. To this end, we classify each feeding cycles of ISP into initial stage, transition stage, and steady stage, and use standard PCA, first order perturbation (FOP) based recursive dynamic PCA and multi-mode approach to deal with them respectively. The monitoring results using real data show that the proposed scheme can be able to eliminate false alarms and detect faults efficiently.
Zhi-kun Hu,Wei-hua Gui,Chun-hua Yang,Fei Xu 제어·로봇·시스템학회 2010 International Journal of Control, Automation, and Vol.8 No.2
A feature vectors extracting method for similarity measurement between a referenced sequence and an analyzed sequence is proposed. The referenced sequence and analyzed sequence are compressed into two wavelet matrices by Discrete Orthogonal Wavelet Transform (DOWT), respectively. A singular value vector and the multi-subspaces of the referenced matrix are derived from wavelet matrices by singular value decomposition (SVD). Consequently, a uniform subspace of which all sequences are mutual orthogonal can be constructed by serializing multi-subspaces, and the analyzed feature vectors can also be obtained by inner product transformation between analyzed sequence and all sequences derived from the multi-subspaces. The similarity is measured between the analyzed feature vector and the singular value vector of the referenced sequence. The simulation results show that the proposed method is improved in the dimension, accuracy and anti-noise ability with little sensitivity sacrifice.
Zhi-kun Hu,Wei-hua Gui,Chun-hua Yang,Peng-cheng Deng,Steven X. Ding 제어·로봇·시스템학회 2011 International Journal of Control, Automation, and Vol.9 No.4
A new classification method for fault waveform is proposed based on discrete orthogonal wavelet transform (DOWT) and hybrid support vector machine (hybrid SVM) for fault type of a three-phase voltage inverter. The waveforms of output voltage obtained from the faulty inverter are decomposed by DOWT into wavelet coefficient matrices, through which we can obtain singular value vectors acted as features of time-series periodic waveforms. And then a multi-classes classification method based on a new Huffman Tree structure is presented to realize 1-v-r SVM strategy. The extracted features are applied to hybrid SVM for determining fault type. Compared to employing the structure based on ordinary binary tree, the superiority of the proposed SVM method is shown in the success of fault diagnosis because the average Loo-correctness of the SVM based on Huffman tree structure exceed the general SVM 3.65%, and the correctness reaches 99.6%.
Enhance Transparency of Force Feedback Interaction Series Mechanism by SMC Strategy
Zhi Hu,Yueying Wang,Guohua Cui,Dan Zhang 제어·로봇·시스템학회 2019 International Journal of Control, Automation, and Vol.17 No.7
To enhance the fidelity of virtual surgery, the force feedback interaction mechanism would simulatethe force information in real surgery. This paper first introduces evaluation methods of fidelity, then it exploresevaluation methods of force feedback fidelity, and put up the evaluation methods and indexes of force feedbackfidelity. In rigid force feedback interaction mechanism, fidelity is mainly shown as transparency. It means thetransfer function of the mechanism needs approach to 1, while friction, gravity, slip of the linear drive and otherfactors would affect transparency of the mechanism. This study introduces a 5-DOF (degree of freedom) forcefeedback series mechanism with long stroke. It discusses gravity compensation and simulation of typical virtualenvironment. It uses sliding mode control (SMC) to eliminate the effect of parameter variety, inaccurate modelingand other factors to improve system robustness. And it adds disturbance observer to the controller to eliminategravity inaccuracy. Finally, it evaluates the enhancement of force feedback fidelity.
Hu-zhi Zhang,Peng Luo,Jian Yuan,Yao-sen Huang,Jia-dong Liu 국제구조공학회 2022 Structural Engineering and Mechanics, An Int'l Jou Vol.84 No.4
By presetting various reinforcement diameters in topology optimization with the discrete model finite element analysis, an algorithm of bidirectional evolutionary structural optimization of multi-level reinforcement diameter is presented to obtain the optimal reinforcement topologies which describe the degree of stress of different parts. The results of a comparative study on different reinforcement feasible domain demonstrate that the more angle types of reinforcement are arranged in the initial domain, the higher utilization rate of reinforcement of the optimal topology becomes. According to the nonlinear finite element analysis of some deep beam examples, the ones designed with the optimization results have a certain advantage in ultimate bearing capacity, although their failure modes are greatly affected by the reinforcement feasible domain. Furthermore, the bearing capacity can be improved when constructional reinforcements are added in the subsequent design. However the adding would change the relative magnitude of the bearing capacity between the normal and inclined section, or the relative magnitude between the flexural and shear capacity within the inclined section, which affects the failure modes of components. Meanwhile, the adding would reduce the deformation capacity of the components as well. It is suggested that the inclined reinforcement and the constructional reinforcement should be added properly to ensure a desired ductile failure mode for components.
Zhi-kun Wang,Yun-xiang Huang,Zheng-diao Miao,Zhi-yan Hu,Xin-zhang Song,Li Liu 한국유전학회 2013 Genes & Genomics Vol.35 No.4
A novel bright-green leaf mutant, bgl11, derived from Nipponbare (Oryza sativa L. ssp. japonica) treated by ethyl methanesulfonate (EMS), exhibited a distinct brightgreen leaf phenotype throughout development. Chlorophyll contents of bgl11 decreased significantly than that of its wild-type parent. Genetic analysis suggested that the brightgreen leaf trait was controlled by a single recessive nuclear gene, which was tentatively designed as BGL11(t). To isolate the BGL11(t) gene, a map-based cloning strategy was employed, and the gene was finally mapped in a 94.7 kb region between marker InDel11-5 and InDel11-9 on the long arm of chromosome 11, in which no gene leaded to leaf-color mutation had been mapped or cloned. Cloning and sequencing analysis revealed that, LOC_Os11g38040, which was predicted to encode an expressed protein, had a 9 bp segment deletion in the coding region of bgl11. Furthermore, the transgenic plants with wild-type gene LOC_Os11g38040were restored to normal phenotype. Accordingly, the gene (LOC_Os11g38040) was identified as the BGL11(t) gene. These results are very valuable for further study on BGL11(t)gene and illuminating the mechanism of chloroplast development in rice.
The effects of LNG-tank sloshing on the global motions of FLNG system
Hu, Zhi-Qiang,Wang, Shu-Ya,Chen, Gang,Chai, Shu-Hong,Jin, Yu-Ting The Society of Naval Architects of Korea 2017 International Journal of Naval Architecture and Oc Vol.9 No.1
This paper addresses a study of inner-tank sloshing effect on motion responses of a Floating Liquefied Natural Gas (FLNG) system, through experimental analysis and numerical modeling. To investigate hydrodynamic characteristics of FLNG under the conditions of with and without LNG-tank sloshing, a series of numerical simulations were carried out using potential flow solver SESAM. To validate the numerical simulations, model tests on the FLNG system was conducted in both liquid and solid ballast conditions with 75% tank filling level in height. Good correlations were observed between the measured and predicted results, proving the feasibility of the numerical modeling technique. On the verified numerical model, Response Amplitude Operators (RAOs) of the FLNG with 25% and 50% tank filling levels were calculated in six degrees of freedom. The influence of tank sloshing with varying tank filling levels on the RAOs has been presented and analyzed. The results showed that LNG-tank sloshing has a noticeable impact on the roll motion response of the FLNG and a moderate tank filling level is less helpful in reducing the roll motion response.