Clamping-diode Circuit for Marine Controlled-source Electromagnetic Transmitters

Song, Hongxi,Zhang, Yiming,Gao, Junxia,Zhang, Yu,Feng, Xinyue The Korean Institute of Power Electronics 2018 JOURNAL OF POWER ELECTRONICS Vol.18 No.2

Marine controlled-source electromagnetic transmitters (MCSETs) are important in marine electromagnetic exploration systems. They play a crucial role in the exploration of solid mineral resources, marine oil, and gas and in marine engineering evaluation. A DC-DC controlled-source circuit is typically used in traditional MCSETs, but using this circuit in MCSETs causes several problems, such as large voltage ringing of the high-frequency diode, heating of the insulated-gate bipolar transistor (IGBT) module, high temperature of the high-frequency transformer, loss of the duty cycle, and low transmission efficiency of the controlled-source circuit. This paper presents a clamping-diode circuit for MCSET (CDC-MCSET). Clamping diodes are added to the controlled-source circuit to reduce the loss of the duty ratio and the voltage peak of the high-frequency diode. The temperature of the high-frequency diode, IGBT module, and transformer is decreased, and the service life of these devices is prolonged. The power transmission efficiency of the controlled-source circuit is also improved. Saber simulation and a 20 KW MCSET are used to verify the correctness and effectiveness of the proposed CDC-MCSET.

Clamping-diode Circuit for Marine Controlled-source Electromagnetic Transmitters

Hongxi Song,Yiming Zhang,Junxia Gao,Yu Zhang,Xinyue Feng 전력전자학회 2018 JOURNAL OF POWER ELECTRONICS Vol.18 No.2

Marine controlled-source electromagnetic transmitters (MCSETs) are important in marine electromagnetic exploration systems. They play a crucial role in the exploration of solid mineral resources, marine oil, and gas and in marine engineering evaluation. A DC–DC controlled-source circuit is typically used in traditional MCSETs, but using this circuit in MCSETs causes several problems, such as large voltage ringing of the high-frequency diode, heating of the insulated-gate bipolar transistor (IGBT) module, high temperature of the high-frequency transformer, loss of the duty cycle, and low transmission efficiency of the controlled-source circuit. This paper presents a clamping-diode circuit for MCSET (CDC-MCSET). Clamping diodes are added to the controlled-source circuit to reduce the loss of the duty ratio and the voltage peak of the high-frequency diode. The temperature of the high-frequency diode, IGBT module, and transformer is decreased, and the service life of these devices is prolonged. The power transmission efficiency of the controlled-source circuit is also improved. Saber simulation and a 20 KW MCSET are used to verify the correctness and effectiveness of the proposed CDC-MCSET.

Label-free quantitative secretome analysis of <i>Xanthomonas oryzae</i> pv. <i>oryzae</i> highlights the involvement of a novel cysteine protease in its pathogenicity

Wang, Yiming,Gupta, Ravi,Song, Wei,Huh, Hyun-Hye,Lee, So Eui,Wu, Jingni,Agrawal, Ganesh Kumar,Rakwal, Randeep,Kang, Kyu Young,Park, Sang-Ryeol,Kim, Sun Tae Elsevier 2017 Journal of proteomics Vol.169 No.-

<P><B>Abstract</B></P> <P>Bacterial blight, caused by <I>Xanthomonas oryzae</I> pv. <I>oryzae</I> (<I>Xoo</I>), is one of the most devastating diseases resulting in a huge loss of the total rice productivity. The initial interaction between rice and <I>Xoo</I> takes place in the host apoplast and is mediated primarily by secretion of various proteins from both partners. Yet, such secretory proteins remain to be largely identified and characterized. This study employed a label-free quantitative proteomics approach and identified 404 and 323 <I>Xoo</I>-secreted proteins from <I>in vitro</I> suspension-cultured cells and <I>in planta</I> systems, respectively. Gene Ontology analysis showed their involvement primarily in catalytic, transporter, and ATPase activities. Of a particular interest was a <I>Xoo</I> cysteine protease (<I>Xo</I>CP), which showed dramatic increase in its protein abundance <I>in planta</I> upon <I>Xoo</I> interaction with a susceptible rice cultivar. Knock-out mutants of <I>XoCP</I> showed reduced pathogenicity on rice, highlighting its potential involvement in <I>Xoo</I> virulence. Besides, a parallel analysis of <I>in planta</I> rice-secreted proteins resulted in identification of 186 secretory proteins mainly associated with the catalytic, antioxidant, and electron carrier activities. Identified secretory proteins were exploited to shed light on their possible role in the rice-<I>Xoo</I> interaction, and that further deepen our understanding of such interaction.</P> <P><B>Biological significance</B></P> <P> <I>Xanthomonas oryzae</I> pv. <I>oryzae</I> (<I>Xoo</I>), causative agent of bacterial blight disease, results in a huge loss of the total rice productivity. Using a label-free quantitative proteomics approach, we identified 727 <I>Xoo</I>- and 186 rice-secreted proteins. Functional annotation showed <I>Xoo</I> secreted proteins were mainly associated with the catalytic, transporter, and ATPase activities while the rice secreted proteins were mainly associated with the catalytic, antioxidant, and electron carrier activities. A novel <I>Xoo</I> cysteine protease (<I>Xo</I>CP) was identified, showing dramatic increase in its protein abundance <I>in planta</I> upon <I>Xoo</I> interaction with a susceptible rice cultivar. Knock-out mutants of <I>XoCP</I> showed reduced pathogenicity on rice, highlighting its potential involvement in <I>Xoo</I> virulence.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A label-free quantitative proteomics approach was utilized for identification of <I>Xoo</I> secreted proteins. </LI> <LI> A total of 404 and 323 <I>Xoo</I>-secreted proteins were identified and quantified from <I>in vitro</I> and <I>in planta</I> systems respectively. </LI> <LI> A novel cysteine protease (<I>Xo</I>CP) was identified to be involved in <I>Xoo</I> pathogenicity. </LI> <LI> Moreover, 186 secretory proteins were also identified from <I>in-planta</I> secretome. </LI> <LI> Rice secretory proteins mainly associated with the catalytic, antioxidant, and electron carrier activities. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

Synthesis of SrTiO3 Fibers and Their Effects on the Thermoelectric Properties of La0.1Dy0.1Sr0.75TiO3 Ceramics

Jiao Han,YiMing Zeng,Ying Song,HongQuan Liu 대한금속·재료학회 2019 ELECTRONIC MATERIALS LETTERS Vol.15 No.3

SrTiO 3 fi bers were fabricated by an in situ hydrothermal method using hydrated TiO 2 fi bers as both template and reactant. La 0.1 Dy 0.1 Sr 0.75 TiO 3 powders containing x wt.% SrTiO 3 fi bers ( x = 0, 1, 3, 5) were prepared by the sol–gel method andthen sintered at 1450 °C under a reducing atmosphere (N 2 /H 2 = 95/5). XRD analysis showed that the samples were mainlycomposed of SrTiO 3 phase and a few Dy 2 Ti 2 O 7 phase. TiO 2 phase was detected in the samples with x = 3 and x = 5, and itspeak intensity clearly reinforced with increasing x . With the addition of SrTiO 3 fi bers, the electrical conductivity increasedsignifi cantly and the Seebeck coeffi cient kept almost unchanged, resulting in a high power factor of 1015 μW m −1 K −2 at200 °C with a loading of 3 wt.% SrTiO 3 fi bers. Meanwhile, combined with low thermal conductivity, the sample with 3 wt.%SrTiO 3 fi bers showed the peak ZT value of 0.19 at 500 °C, which was 127% higher than that of La 0.1 Dy 0.1 Sr 0.75 TiO 3 .

The Role of K _V 7.3 in Regulating Osteoblast Maturation and Mineralization

Yang, Ji Eun,Song, Min Seok,Shen, Yiming,Ryu, Pan Dong,Lee, So Yeong MDPI 2016 INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES Vol.17 No.3

<P>KCNQ (K<SUB>V</SUB>7) channels are voltage-gated potassium (K<SUB>V</SUB>) channels, and the function of K<SUB>V</SUB>7 channels in muscles, neurons, and sensory cells is well established. We confirmed that overall blockade of K<SUB>V</SUB> channels with tetraethylammonium augmented the mineralization of bone-marrow-derived human mesenchymal stem cells during osteogenic differentiation, and we determined that K<SUB>V</SUB>7.3 was expressed in MG-63 and Saos-2 cells at the mRNA and protein levels. In addition, functional K<SUB>V</SUB>7 currents were detected in MG-63 cells. Inhibition of K<SUB>V</SUB>7.3 by linopirdine or XE991 increased the matrix mineralization during osteoblast differentiation. This was confirmed by alkaline phosphatase, osteocalcin, and osterix in MG-63 cells, whereas the expression of Runx2 showed no significant change. The extracellular glutamate secreted by osteoblasts was also measured to investigate its effect on MG-63 osteoblast differentiation. Blockade of K<SUB>V</SUB>7.3 promoted the release of glutamate via the phosphorylation of extracellular signal-regulated kinase 1/2-mediated upregulation of synapsin, and induced the deposition of type 1 collagen. However, activation of K<SUB>V</SUB>7.3 by flupirtine did not produce notable changes in matrix mineralization during osteoblast differentiation. These results suggest that K<SUB>V</SUB>7.3 could be a novel regulator in osteoblast differentiation.</P>

Nonlinear dynamic analysis of cutting head-rotor-bearing system of the roadheader

Zhilong Huang,Zhongchao Zhang,Yiming Li,Guiqiu Song,Yang He 대한기계학회 2019 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.33 No.3

In order to study the dynamic characteristics of cutting head and cantilever system, a nonlinear dynamic model with a 13 degrees of freedom (13-DOF) lateral torsional coupled cutting head-rotor-bearing system (CHRBS) is established. The nonlinear coupled factors of spline clearance and bearing contact force are mainly considered, the dynamic analysis of CHRBS under time-varying load is carried out. The results show that there is no positive correlation between the cutting rock thickness and the states of chaotic motion and quasiperiodic motion. The system is in the two states mentioned above when in low speed region. With the increase of rotational speed, the chaotic motion becomes periodic motion. When the hardness of rock is lower, increasing rotational speed can reduce the vibration of the system, and the cutting thickness can be increased to improve the productivity and lump rock rate. As the hardness of rocks increases, the coupled system shows complex dynamic characteristics when the rotational speed changes from low to high, and the vibration increased. When cutting hard rock, the cutting speed should be increased. However, when the speed is too high, the cutting torque of system becomes smaller. In the case of cutting hard rock, reasonable rotational speed should be chosen between improving stability and increasing cutting force. The dynamic analysis results provide strong support for the vibration reduction and dynamic design of roadheader.

Improvement of electrical characteristics of InGaZnO thin film transistors by using HMDSO/O2 plasma deposited SiOCH buffer layer

Liu Chang,Qin Houyun,Liu Yiming,Wei Song,Wang Hongbo,Zhao Yi 한국물리학회 2021 Current Applied Physics Vol.21 No.-

In this work, we present the performance improved InGaZnO thin film transistors by inserting low temperature processed 10 nm thick SiOCH buffer layers between SiNx insulator and InGaZnO channel layer. The influences of oxygen flow rate during the deposition of SiOCH buffer layer have been intensively investigated. Basing on the analysis of hall effect measurement and Fourier transform infrared spectrum, the SiOCH buffer layer can effectively increase the carrier concentration of the channel layer by the hydrogen doping due to re-sputtering and diffusion effect. The InGaZnO thin film transistor with buffer layer exhibits an enhanced performance with mobility of 13.09 cm2/vs, threshold voltage of 0.55 V and Ion/Ioff over 106.

A Comparative Study on the Performance of FEM, RA and ANN Methods in Strength Prediction of Pallet-Rack Stub Columns

ZhiJun Lyu,Jie Zhang,Ning Zhao,Qian Xiang,YiMing Song,Jie Li 한국강구조학회 2020 International Journal of Steel Structures Vol.20 No.5

The rack column is one of the essential elements in the pallet rack system. However, due to its distinctive perforation feature, it is challenging to analyze its stability using traditional theories for cold-formed steel structures. In this paper, we are interested in the comparison analysis of strength prediction on the perforated columns using fi nite element method (FEM), regression analysis (RA) and artifi cial neural network (ANN) methods respectively. First, a refi ned fi nite element (FE) model considering the perforation and nonlinearity behavior was generated and calibrated against the experimental results. Subsequently, the validated FE model was used to perform the parametric analysis for the diff erent holes in columns. Given experimental and simulated data, a regression model with an equivalent thickness was proposed for the design strength prediction of thin-walled steel perforated sections. For comparison of the RA model, two powerful tools such as the FEM and ANN are also employed to predict the design strength of diff erent perforated sections. Four indicators were used to assess the accuracy and generalization performance of the three models, including the root mean square error, the mean absolute percentage error, the correlation coeffi cient and the mean relative percentage. The obtained results show that although they both have good consistency, FEM still slightly outperforms the other two models. Since the values calculated from ANN and regression models are usually smaller than the experimental data, they are reasonably recommended as eff ective and safer design tools than FEM models from the perspective of engineering applications.