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The Phylotype of Thermus from the Rehai Geothermal Area, Tengchong, China
Guo, Chunlei,Wang, Tao,Zhu, Wei,Zhang, Donghua,Cui, Xiaolong,Xu, Lihua,Peng, Qian The Microbiological Society of Korea 2003 The journal of microbiology Vol.41 No.2
Through enrichment on two nutrient agars, 57 Thermus isolates were recovered from 15 hot spring samples taken from the Rehai geothermal area, Tengchong, China. Unique growth characteristics were observed when the strains were transferred from YIM14 medium to Thermus medium. Phylogenetic analysis showed that the 16S rDNA sequences of the isolates and clones from the Rehai geothermal area farmed a monophyletic group on the phylogenetic tree. A secondary structure comparison showed that their 16S rRNAs have unique secondary structure characteristics.
Seismic behavior of energy dissipation shear wall with CFST column elements
Hao Su,Lihua Zhu,Yaohong Wang,Lei Feng,Zeyu Gao,Yuchen Guo,Longfei Meng,Hanquan Yuan 국제구조공학회 2022 Steel and Composite Structures, An International J Vol.43 No.1
To develop high-efficiency lateral force resistance components for high-rise buildings, a novel energy dissipation shear wall with concrete-filled steel tubular (CFST) column elements was proposed. An energy dissipation shear wall specimen with CFST column elements (GZSW) and an ordinary reinforced concrete shear wall (SW) were constructed, and experimented by low-cycle reversed loading. The mechanical characteristics of these two specimens, including the bearing capacity, ductility, energy dissipation, and stiffness degradation process, were analyzed. The finite-element model of the GZSW was established by ABAQUS. Based on this finite-element model, the effect of the placement of steel-plate energy dissipation connectors on the seismic performance of the shear wall was analyzed, and optimization was performed. The experiment results prove that, the GZSW exhibited a superior seismic performance in terms of bearing capacity, ductility, energy dissipation, and stiffness degradation, in comparison with the SW. The results calculated by the ABAQUS finite-elements model of GZSW corresponded well with the results of experiment, and it proved the rationality of the established finite-elements model. In addition, the optimal placement of the steel-plate energy dissipation connectors was obtained by ABAQUS.
Reaction kinetics for synthesis of isopropyl myristate catalyzed by sulfated titania
Ting Qiu,Lihua Zhou,Yu Niu,Jinbei Yang,Chenggang Li,Xiaoting Guo,Ling Li 한국화학공학회 2016 Korean Journal of Chemical Engineering Vol.33 No.8
Sulfated titania (SO4 2−/TiO2) was prepared and characterized by nitrogen adsorption-desorption, FT-IR, thermostability analyzer, XRD and particle size analyzer. The esterification of myristic acid (MA) with isopropanol (IPOH) catalyzed by the solid super acid SO4 2−/TiO2 was studied. The effect of reaction kinetics conditions such as temperature, stirrer speed, initial mole ratio of alcohol to acid, and catalyst loading on the conversion of myristic acid was investigated. A second-order pseudo-homogeneous model was developed to calculate the rate of the reaction, and then the kinetic parameters were estimated. The calculated values were in agreement with experimental data.
Ghulam Hussain Jatoi,Guo Lihua,Yang Xiufen,Muswar Ali Gadhi,Azhar Uddin Keerio,Yusuf Ali Abdulle,Dewen Qiu 한국식물병리학회 2019 Plant Pathology Journal Vol.35 No.3
Here, we reported a novel secreted protein elicitor PeBL2 from Brevibacillus laterosporus A60, which can induce hypersensitive response in tobacco (Nicotiana benthamiana). The ion-exchange chromatography, high-performance liquid chromatography (HPLC) and mass spectrometry were performed for identification of protein elicitor. The 471 bp PeBL2 gene produces a 17.22 kDa protein with 156 amino acids containing an 84-residue signal peptide. Consistent with endogenous protein, the recombinant protein expressed in Escherichia coli induced the typical hypersensitive response (HR) and necrosis in tobacco leaves. Additionally, PeBL2 also triggered early defensive response of generation of reactive oxygen species (H2O2 and O2 -) and systemic resistance against of B. cinerea. Our findings shed new light on a novel strategy for biocontrol using B. laterosporus A60.
Jatoi, Ghulam Hussain,Lihua, Guo,Xiufen, Yang,Gadhi, Muswar Ali,Keerio, Azhar Uddin,Abdulle, Yusuf Ali,Qiu, Dewen The Korean Society of Plant Pathology 2019 Plant Pathology Journal Vol.35 No.3
Here, we reported a novel secreted protein elicitor PeBL2 from Brevibacillus laterosporus A60, which can induce hypersensitive response in tobacco (Nicotiana benthamiana). The ion-exchange chromatography, high-performance liquid chromatography (HPLC) and mass spectrometry were performed for identification of protein elicitor. The 471 bp PeBL2 gene produces a 17.22 kDa protein with 156 amino acids containing an 84-residue signal peptide. Consistent with endogenous protein, the recombinant protein expressed in Escherichia coli induced the typical hypersensitive response (HR) and necrosis in tobacco leaves. Additionally, PeBL2 also triggered early defensive response of generation of reactive oxygen species ($H_2O_2$ and $O_2{^-}$) and systemic resistance against of B. cinerea. Our findings shed new light on a novel strategy for biocontrol using B. laterosporus A60.
Yan Chang,Jianbin Zhang,Qiang Li,Lihua Li,Bo Guo,Tianxiang Zhao 한국화학공학회 2014 Korean Journal of Chemical Engineering Vol.31 No.12
Liquid densities and viscosities are reported for the binary system of 1,2-ethanediamine (EDA)+triethyleneglycol (TEG) at T=(298.15, 303.15, 308.15, and 313.15) K. Densities were measured using a capillary pycnometerand viscosities were determined using an Ubbelohde capillary viscometer. The experimental results are compared withdata published in the literatures. Based on the density data and kinematic viscosity data, excess molar volumes (VmE)and deviation in kinematic viscosity (Δν) were calculated and the calculated results were fitted to a Redlich-Kister equa-tion to obtain the coefficients and estimate the standard deviations between the experimental and calculated quantities. The values of VmEare negative in the whole composition range, whereas the values of Δν are positive over the majorcomposition range. From kinematic viscosity data, Gibbs energies of activation of viscous flow (ΔG*), enthalpy of ac-tivation for viscous flow (ΔH*), and entropy of activation for the viscous flow (ΔS*) were also calculated.
Simulated Long-Term Vegetation–Climate Feedbacks in the Tibetan Plateau
Wei Hua,Zouxin Lin,Donglin Guo,Guangzhou Fan,Yongli Zhang,Kaiqin Yang,Qin Hu,Lihua Zhu 한국기상학회 2019 Asia-Pacific Journal of Atmospheric Sciences Vol.55 No.1
The Tibetan Plateau (TP) is an important region of land–atmosphere interactions with high climate variability. In this study, an atmosphere–vegetation interaction model was applied to explore the possible responses of vegetation to climate warming, and to assess the impacts of land cover change on the land surface physical processes across the TP. Results showed that long-term warming over the TP could influence vegetation growth via different mechanisms. Most likely, increased temperature would enhance the physiological activity in most high cold areas on the TP, whereas high temperature would inhibit vegetation growth by increasing respiration in areas with favorable water and temperature conditions. In addition, for areas where the climate is warmer but not wetter, higher temperature could influence photosynthesis via the moisture condition of the vegetation rather than by modulating respiration. Numerical simulations demonstrated that vegetation could control the land surface–atmosphere energy balance effectively. The change of land cover from vegetated land to desert steppe decreased the net radiation absorbed by the surface, weakening the surface thermal effects, and reducing sensible and latent heat fluxes. Furthermore, sensitivity simulations also revealed that global warming would likely accelerate vegetation growth in most areas of the TP, resulting in increased surface heat flux.
Nonlinear machine fault detection by semi-supervised Laplacian Eigenmaps
Quansheng Jiang,Qixin Zhu,Bangfu Wang,Lihua Guo 대한기계학회 2017 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.31 No.8
A semi-supervised Laplacian Eigenmaps algorithm for machine fault detection is proposed. The purpose of the algorithm is to efficiently extract the manifold geometric characteristics of nonlinear vibration signal samples, and to determine fault classification of operating equipment so that the accuracy of fault detection can be improved. The data acquisition and pre-processing of the vibration signal is firstly implemented from monitoring equipment, then hybrid domain feature is obtained, and the initial sample set can be built. This is followed by implementing the semi-supervised Laplacian Eigenmaps algorithm so that the sensitive nature characteristics of manifold can be obtained from the device initial sample set. In order to establish the intelligent diagnostic model, the Least square Support vector machine (LS-SVM) is then adopted, which fault diagnosis and decisions can be achieved in the feature space of the low-dimensional manifold. The experiment results of using the IRIS data, gearbox and compressor fault data show the proposed method has more advantage when compared with the PCA and Laplacian Eigenmaps on improving the accuracy of fault detection.
Research on metal flow law of micro-riblets based on multi-pass rolling
Xujie Gao,Huihang Wang,Guangming Zhu,Zheng Chang,Nana Guo,Zongshen Wang,Lihua Zhu 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.5
Micro-riblets (grooves) can reduce surface friction in turbulent flow by up to 10 %. Furthermore, roll forming is an effective method for manufacturing large-area groove structures. In this study, the fluidity of metal during the multi-pass rolling of microgrooves was studied, and the reason for the accumulation of materials at the end of rolling was explained. A comparative analysis was conducted between single-pass rolling and multi-pass rolling. Then, according to the distribution of stress field and strain field, the force and flow tendency of the metal during rolling were studied. The gradually changing streamlined roller tooth profile promoted the flow of metal to both sides of the gear hob. Given the same reduction, the forming height of micro-grains during multi-pass rolling was 64.2 % higher than that during single-pass rolling.