Comprehensive Analysis of the Dilatation During Bainitic Transformation Under Stress

Ming-xing Zhou,Guang Xu,Li Wang,Zheng-liang Xue,Hai-jiang Hu 대한금속·재료학회 2015 METALS AND MATERIALS International Vol.21 No.6

The thermal simulation experiments on bainitic transformation were conducted on Gleeble 3800. The microstructures of specimens were examined by scanning electron microscopy. The main purpose is to investigate the relationship between the dilatation of specimens and bainitic transformation under stress. Results show that the radial strain cannot represent the real amount of bainitic transformation under stress because the radial strain contains both shear and dilatational components of invariant plane strain. In this case, the volume strain, which eliminates the influence of the shear components, should be used to analyze the amount of bainitic transformation under stress. In addition, the radial strain should not be used for the investigation of the kinetics of bainitic transformation under stress. For bainitic transformation without stress, the radial strain of the specimen can represent the amount of bainite, and can be used for the analysis of the kinetics of bainitic transformation; so it is not necessary to measure the volume strain. The present study clarifies the relationship between dilatation and the bainitic transformation under stress, and provides a useful reference to the analysis of bainitic transformation under stress.

Overexpression of Chalcone Isomerase (CHI) Increases Resistance Against Phytophthora sojae in Soybean

Jin-ming Zhao;Han Xing,Yang Zhou; Jian-li Huang; Xiao-li Zhang; Long-ming Zhu; Xin-fang Wang 한국식물학회 2018 Journal of Plant Biology Vol.61 No.5

Chalcone isomerase (CHI) is a key enzyme ofthe flavonoid pathway that plays crucial roles in plant responsesto various pathogens. Our previous study using comparativetranscriptome analysis of soybean inoculated with or withoutPhytophthora sojae revealed Glyma.20G241500, a homologof CHI1A in Arabidopsis thaliana, to be induced by P.sojaein soybean. In the present study, we isolated the gene fromsoybean cultivar Nannong 10-1, designating it GmCHI1A. GmCHI1A transcripts were detected in soybean roots, stemsand leaves, with the highest levels in roots. Interestingly,GmCHI1A localizes to the cortical endoplasmic reticulum(ER). GmCHI1A was overexpressed in hairy roots to furtheruncover the roles of CHIs in soybean. Compared to emptyvector-expressing hairy roots (EV) infected with P. sojae,hairy roots overexpressing GmCHI1A (OE) exhibited decreasedP. sojae biomass accumulation, shortened the lesion lengthsand reduced zoospores germination. These results demonstratethat GmCHI1A plays positive roles in the response ofsoybean to P. sojae.

Enrichment of iron element from sulfur-containing iron tailings by S-HGMS technology

Zhou, Ya-qian,Yang, Rui-ming,Guo, Peng-hui,Li, Su-qin,Xing, Yi The Korean Society of Superconductivity and Cryoge 2021 한국초전도저온공학회논문지 Vol.23 No.3

Comprehensive utilization of sulfur-containing iron tailings (SIT) not only solves environmental problems but also creates certain economic value. The iron element from SIT was enriched by the superconducting high gradient magnetic separation (S-HGMS) technology in this study. In the experiments, the total iron content (TFe) was increased from 26.3% to 60.5% with the total sulfur content (TS) of 5.9% under the optimal parameters, i.e., a magnetic flux density of 0.4 T, a slurry flow rate of 1500 mL/min. The high-quality sulfur-containing material with TFe of more than 60% was obtained, which can be used for preparing high-sulfur free cutting steel. The S-HGMS technology can realize the resource utilization of iron tailings with high added value.

Biotechnology : Microbial Desulfurization of Dibenzothiophene and 4,6-Dimethyldibenzothiophene in Dodecane and Straight-Run Diesel Oil

( Luo Ming Fang ),( Xing Jian Min ),( Gou Zhong Xuan ),( Liu Hui Zhou ),( Chen Jia Yong ) 한국화학공학회 2003 Korean Journal of Chemical Engineering Vol.20 No.4

The desulfurization of dibenzothiophene (DBT), 4,6-dimethyldibenzothiophene (4,6-DMDBT) and their mixture by lyophilized cells of Pseudomonas delafieldii R-8 was studied in the presence of dodecane. The desulfurization rate for 4,6-DMDBT was found to be about 40% in comparison with that for DBT. The desulfurization process for DBT and 4,6-DMDBT proceeded simultaneously without preference for either one. The desulfurization rate for each compound was decreased when they were mixed together. The extent of desulfurization of 4,6-DMDBT was increased with the increase of cell concentration and the decrease of the volume ratio of oil-to-water used. The specific desulfurization rate for 4,6-DMDBT could be reached to 10.4 mmol sulfur kg^(-1) (cell) h^(-1) [approximately 0.33 mg sulfur g^(-1) (cell) h^(-1)]. Pseudomonas delafieldii R-8 showed high desulfurization capability for straight-run diesel oil (containing 1,807 mg/L of sulfur). About 1,000 mg/L of sulfur in diesel oil was removed by resting cells of this strai in 24 h of reaction. The specific desulfurization rate was 8.75 mmol sulfur kg^(-1) (cell) h^(-1).

Performance Analysis of Packet Transport Network Communication for Integrated Wide-Area Protection

Sheng-ming Ge,Z Q Bo,Lin Wang,Zhan-feng Fan,Xing Liu,Feng-quan Zhou 보안공학연구지원센터 2016 International Journal of Grid and Distributed Comp Vol.9 No.3

As a new protection, wide-area protection enables protective relaying, and automatic control based on electric power system network communications and comprehensive judgment of multi-point information, which plays an increasingly important role in the secure and stable operation of electric power system. Interaction of wide-area information relies on communication network featuring high reliability and low time delay. On the other hand, most service of power transformation station is gradually towards IP and data oriented, along with the development of smart grid. This paper aims to introduce the wide-area protection technology supported by Packet Transport Network (PTN) communication technology, with analyzing the QoS (Quality of Service) network assurance architecture of PTN network, which establishes three planes, including transport plane, management plane, and control plane, based on ASON (Automatically Switched Optical Network) technology. After demonstrating the QoS assurance system of PTN from traffic control and transmission route, this paper introduces PTN networking test. Based on detailed parameters in the test results, the transmission performance of PTN on time delay, protection, and time synchronization of various electric power communication services are analyzed, with showing that PTN can fully meet the requirements of electric power communication.

Surface plasmon resonance-enhanced solar-driven photocatalytic performance from Ag nanoparticles-decorated Ti3+ self-doped porous black TiO2 pillars

Guo Zhou,Haiyan Meng,Yan Cao,Xuejun Kou,Shuxiang Duan,Leilei Fan,Ming Xiao,Fangzhou Zhou,Zhenzi Li,Zipeng Xing 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.64 No.-

The tiny Ag nanoparticles-uniformly decorated Ti3+ self-doped porous black TiO2 pillars (Ag-TPBTPs) are prepared, which show obvious surface plasmon resonance (SPR) and extend the photoresponse to visible light and near-infrared region (∼1500 nm). The Ag-TPBTPs exhibit excellent solar-driven photocatalytic activities by mineralizing of high-toxic 2,4-dichlorophenol (∼99%), which is three times higher than that of the pristine TiO2. The remarkable solar-driven photocatalytic performance can be ascribed to the porous pillars structure offering more surface active sites, the self-doped Ti3+ and SPR effect of Ag nanoparticles improving the utilization of solar light, and enhancing the spatial separation efficiency of photogenerated charge carriers.

3D Machining Allowance Analysis Method for the Large Thin-Walled Aerospace Component

Hui Wang,Ming-Xing Zhou,Weizhen Zheng,Zhi-Bin Shi,Hong-Wei Li 한국정밀공학회 2017 International Journal of Precision Engineering and Vol.18 No.3

The structural distortion problem of large thin-walled aerospace components has roused much concern on more agile, digitized and cost-efficient precision manufacturing techniques, in particular, designing suitable machining plans according to the real shape of workpieces. To improve the machining accuracy of large thin-walled aerospace components, a methodology of three-dimensional machining allowance modeling and analysis is proposed in this paper. Firstly, the fundamental principles of 3D models matching and alignment between the casting blank and the design part are presented. And by datum transformation from virtual design references to real-world references on casting blanks which are accessible more easily, measuring, positioning and machining the casting blank will be more convenient to realize. Furthermore, the technical character of a large thin-walled aerospace component is considered and a technical framework for 3D machining allowance analysis is given. Finally, the proposed methodology is validated by an experimental study using a typical large thin-walled aerospace component of a hypersonic vehicle. Improvements in accuracy and efficiency performance are realized in comparison with traditional methods.

A reliability analysis method for rock slope controlled by weak structural surface

Jia-wen Zhou,Ming-yuan Jiao,Hui-ge Xing,Xing-guo Yang,Yu-chuan Yang 한국지질과학협의회 2017 Geosciences Journal Vol.21 No.3

Catastrophic landslides maybe occur in rock slope due to the effect of strong earthquakes or heavy rainfall. The stability of rock slope is usually controlled by different scales of weak structural surfaces, which are uncertain and randomly exist in the rock slope. According to the geological characteristics of rock slope, two typical failure modes – plane and wedge are possible. A second-order second-moment (SOSM) method is presented to calculate the reliability index and the failure probability of rock slope, which is an improvement over the first-order second-moment (FOSM) method, and performance functions are built up with the classic limit equilibrium method. The presented method is applied to analyze the failure probability of two rock slopes at the Jinping I Hydropower Station and is compared with the Monte Carlo method and the FOSM method. The computed results show that for plane failure, the reliability index and the failure probability determined by the presented method are 0.563 and 28.7%, respectively, and the reliability index and the failure probability determined by Monte Carlo method are 0.677 and 24.9%, respectively. However, for the FOSM method, the reliability index and failure probability are –0.025 and 51.0%, respectively. For both plane failure and wedge failure, the difference between the presented method and the Monte Carlo method is very small, but the failure probability of plane failure determined by FOSM method is larger than that of the other two methods. The presented method can provide a useful tool to evaluate the failure probability of rock slope.

Enrichment of iron element from sulfur-containing iron tailings by S-HGMS technology

Ya-qian Zhou,Rui-ming Yang,Peng-hui Guo,Su-qin Li,Yi Xing 한국초전도저온공학회 2021 초전도와 저온공학 Vol.23 No.3

Comprehensive utilization of sulfur-containing iron tailings (SIT) not only solves environmental problems but also creates certain economic value. The iron element from SIT was enriched by the superconducting high gradient magnetic separation (S-HGMS) technology in this study. In the experiments, the total iron content (TFe) was increased from 26.3% to 60.5% with the total sulfur content (TS) of 5.9% under the optimal parameters, i.e., a magnetic flux density of 0.4 T, a slurry flow rate of 1500 mL/min. The high-quality sulfur-containing material with TFe of more than 60% was obtained, which can be used for preparing high-sulfur free cutting steel. The S-HGMS technology can realize the resource utilization of iron tailings with high added value.

Molecular cloning, characterization, genomic structure and functional analysis of catalase in Chilo suppressalis

Jing Xu,Ming-Xing Lu,Dong-lin Huang,Yu-zhou Dua 한국응용곤충학회 2017 Journal of Asia-Pacific Entomology Vol.20 No.2

Catalase (CAT), one of the key enzymes involved in protecting organisms from reactive oxygen species (ROS), degrades hydrogen peroxide to oxygen and water. In this study, we isolated the catalase gene (CsCAT) from the striped stemborer, Chilo suppressalis, a serious pest of rice in Asia. Sequence analysis of the genomic DNA indicated that CsCAT contains a 1023 bp intron and a 1524 bp coding sequence. The predicted CsCAT protein contains 507 amino acids and includes the proximal active site (FXRERIPERVVHAKGXGA) and heme-ligand sequence (RLFSYNDTX) that are conserved in catalase enzymes. Phylogenetic analysis indicated that CAT from Lepidopteran moths could be assigned to one well-supported cluster. qRT-PCR indicated that CsCAT was expressed in insect heads, epidermis, fat body, foregut, midgut, hindgut, Malpighian tubules, and hemocytes. Expression of CsCAT was highest in the fat body and hemocytes of diapausing larvae, which suggests a potential important role in insect physiology during diapause period. Expression of CsCAT (measured by qRT-PCR) and enzymatic activity of CsCAT were not significantly altered by temperature stress, which indicates that CsCAT may insensitive to temperature.