High Efficient in Vitro Shoot Regeneration from Cotyledonary Nodes of Vegetable Soybean

Qian-Qian Liu,Jun-Yi Gai,Yue-Lin Zhu,Gang Chen,Li-Fei Yang,Guo-Ping Wei,Cong Wang 한국원예학회 2008 한국원예학회 기타간행물 Vol.- No.-

Highly Efficient Shoot Regeneration from Cotyledonary Nodes of Vegetable Soybean

Qian-Qian Liu,Gang Chen,Jun-Yi Gai,Yue-Lin Zhu,Li-Fei Yang,Guo-Ping Wei,Cong Wang 한국원예학회 2010 원예과학기술지 Vol.28 No.2

풋콩(Glycine max (L.) Merrill) 6개 품종의 자엽절 절편체로부터 thidiazuron(TDZ)과 NAA 농도를 달리한 배지에서 신초의 효율적인 재분화를 조사한 후, 가장 효과가 좋은 생장조절물질 조합으로 배지 종류, 접종방법 및 품종별 신초 재분화율을 조사하였다. 또한 절편체를 배지에 수직 또는 수평으로 치상하는 방법과 B5, 1/2 B5, MS, 1/2 MS, MSB(MS salts + B5 organics) 등의 5가지 기본 배지에 관하여 시험하였다. B5 배지에 1㎎?L<SUP>-1</SUP> TDZ, 0.05㎎?L<SUP>-1</SUP> NAA, 5㎎?L<SUP>-1</SUP> AgNO₃를 첨가한 처리에서 6개 품종의 신초 재분화율이 55.3-88.9%로 높았다. ‘L?ling No. 1’의 경우 수직으로 치상하는 것이 수평으로 치상하는 것보다 신초 재분화율이 37.5% 더 높았다. 따라서 풋콩은 TDZ를 처리한 B5 배지에 자엽절을 수직으로 치상할 때 신초 재분화율이 높았다. To establish a highly efficient system for shoot regeneration in vegetable soybean (Glycine max (L.) Merrill), explants were obtained from six genotypes and adventitious shoots were regenerated from cotyledonary nodes cultured on medium supplemented with different concentrations of N-phenyl-N′-1, 2, 3-thiadiazol-5-ylurea (thidiazuron TDZ) and 1-naphthylacetic acid (NAA). The most effective combination of plant growth regulators was selected first and then the effects of medium types, inoculation methods and genotypic differences on shoot regeneration were studied. The explants were inserted either vertically or horizontally into the medium and five basal media, including B5, ½ B5, MS, ½ MS, and MSB (MS salts and B5 organics), were tested. The shoot regeneration frequency of the six genotypes ranged from 53.5% to 88.9% and three of them reached 88.9%, 87.5% and 83.3%, respectively, on B5 medium supplemented with 1 ㎎?L<SUP>-1</SUP> TDZ, 0.05 ㎎?L<SUP>-1</SUP> NAA, and 5 ㎎?L<SUP>-1</SUP> AgNO₃. The shoot regeneration frequency of explants cultured on B5 medium was significantly higher than that of the other four basal media. The vertically inserted explants were found to yield a higher shoot regeneration frequency than that of horizontally inserted ones; the maximum difference of regenerating percentages between the two methods was 37.5%. In summary, TDZ was an efficient plant growth regulator for shoot induction. B5 medium and vertically inserted explants promoted shoot regeneration. We believe this highly efficient shoot regeneration system will provide foundation for the further transgenic studies in vegetable soybean.

High Performance Wilkinson Power Divider Using Integrated Passive Technology on SI-GaAs Substrate

Cong Wang,Cheng Qian,De-Zhong Li,Wen-Cheng Huang,Nam-Young Kim 한국전자파학회JEES 2008 Journal of Electromagnetic Engineering and Science Vol.8 No.3

An integrated passive device(IPD) technology by semi-insulating(SI)-GaAs-based fabrication has been developed to meet the ever increasing needs of size and cost reduction in wireless applications. This technology includes reliable NiCr thin film resistor, thick plated Cu/Au metal process to reduce resistive loss, high breakdown voltage metalinsulator-metal(MIM) capacitor due to a thinner dielectric thickness, lowest parasitic effect by multi air-bridged metal layers, air-bridges for inductor underpass and capacitor pick-up, and low chip cost by only 6 process layers. This paper presents the Wilkinson power divider with excellent performance for digital cellular system(DCS). The insertion loss of this power divider is ?0.43 ㏈ and the port isolation greater than ?22 ㏈ over the entire band. Return loss in input and output ports are ?23.4 ㏈ and ?25.4 ㏈, respectively. The Wilkinson power divider based on SI-GaAs substrates is designed within die size of 1.42 ㎟.

Improved Stability Conditions for Systems with Interval Time-Varying Delay

Wei Qian,Shen Cong,Tao Li,Shumin Fei 제어·로봇·시스템학회 2012 International Journal of Control, Automation, and Vol.10 No.6

The paper is concerned with the stability of linear systems with interval time-varying delay. Through constructing a new augmented Lyapunov-Krasovskii functional (LKF) which contains some quadruple-integral terms and estimating the time derivative of the LKF less conservatively, new stabil-ity criteria are derived without introducing any free matrices. Moreover, by proving the positive defi-niteness of the LKF with some integral inequalities, the constraints on some functional parameters are relaxed and the conservatism of the obtained results are further reduced. Numerical examples are also given to demonstrate the effectiveness and reduced conservatism of the obtained results.

Canonical Correlation Analysis of Selecting Optimal Ground Motion Intensity Measures for Bridges

Shuai Song,Cong Qian,Yongjiu Qian,Han Bao,Pengzhen Lin 대한토목학회 2019 KSCE JOURNAL OF CIVIL ENGINEERING Vol.23 No.7

The correlation between ground motion intensity measures (IMs) and that between component seismic demand parameters (DPs) have significant effects on the seismic demand of bridges. A canonical correlation analysis method was introduced to consider the two types of correlations in the optimal selection of IMs for probabilistic seismic demand analysis of bridges. A group of 100 ground motion-bridge samples were generated with the bin approach and Latin hypercube sampling method, to quantify the uncertainties of earthquakes and bridges. With the nonlinear time history analysis, the overall correlation between IMs and DPs was established (IMs and DPs were respectively treated as a whole), meanwhile the correlation between IMs and that between DPs were considered. The optimal IM was selected and verified with the criteria of efficiency, proficiency and sufficiency. The canonical correlation analysis reduced the complexity and limitation of simple correlation analysis used for all pairs of correlations between each of the IMs and each of the DPs. The combined peak IM of PGA (the peak ground acceleration), PGV (the peak ground velocity), PGD (the peak ground displacement) and combined root mean square IM of aRMS, vRMS, and dRMS were proved to be the optimal IMs and more appropriate in the probabilistic seismic demand analysis of normal girder bridges.

Effect of Chemical Passivation Treatment and Flow on the Corrosion of 304 Stainless Steel in Hydrochloric Acid Solution

( Jie Zhao ),( Cong Qian Cheng ),( Tie Shan Cao ) 한국부식방식학회(구 한국부식학회) 2015 Corrosion Science and Technology Vol.14 No.6

Effects of passive film quality by chemical passivation and solution flow on the corrosion behavior of 304 stainless steel in HCl solution were investigated using a coloration indicator, and by corrosion weight loss, electrochemical polarization and element dissolution measurements. A high redness degree suggests a low passive-film integrity for 304 stainless steel following air exposure, while the minimum redness degree for the samples after chemical passivation suggests a high passive-film integrity. In the static condition,samples subjected to air exposure exhibited a high corrosion rate and preferential dissolution of Fe. Chemical passivation inhibited the corrosion rate due to the intrinsically high structural integrity of the passive film and high concentrations of Cr-rich oxides and hydroxide. Solution flow accelerated corrosion by promoting both the anodic dissolution reaction and the cathodic reaction. Solution flow also altered the preferential dissolution to fast uniform dissolution of metal elements.

Valve core shapes analysis on flux through control valves in nuclear power plants

Jin-yuan Qian,Cong-wei Hou,Juan Mu,Zhi-xin Gao,Zhi-jiang Jin 한국원자력학회 2020 Nuclear Engineering and Technology Vol.52 No.10

Control valves are widely used to regulate fluid flux in nuclear power plants, and there are more than1500 control valves in the primary circuit of one nuclear power plant. With their help, the flux can beregulated to a specific level of water or steam to guarantee the energy efficiency and safety of the nuclearpower plant. The flux characteristics of the control valve mainly depend on the valve core shape. In orderto analyze the effects of valve core shapes on flux characteristics of control valves, this paper focuses onthe valve core shapes. To begin with, numerical models of different valve core shapes are established, andresults are compared with the ideal flux characteristics curve for the purpose of validation. Meanwhile,the flow fields corresponding to different valve core shapes are investigated. Moreover, relationshipsbetween the valve core opening and the outlet flux under different valve core shapes are carried out. Theflux characteristics curve and equation are proposed to predict the outlet flux under different valve coreopenings. This work can benefit the further rese

An Antiviral Mechanism Investigated with Ribavirin as anRNA Virus Mutagen for Foot-and-mouth Disease Virus

Li-li Shi,Cong-yi Zheng,Chao-jiang Gu,Qian Zhang,Yong Li,San-fu Qu 한국생화학분자생물학회 2006 BMB Reports Vol.39 No.1

Quantifying benefits of alternative home delivery operations on transport in China

Liying Song,Jun Wang,Cong Liu,Qian Bian 제어로봇시스템학회 2016 제어로봇시스템학회 국제학술대회 논문집 Vol.2016 No.10

Lately, last-mile issue is of great concerns to cope with the dramatic developments of internet shopping market in China. Several issues arise from home delivery activities for fulfilling those internet shopping orders, e.g., increased operating costs for handing failed home deliveries, and deteriorated traffic conditions due to frequent delivery trips. To improve the logistics efficiency of home delivery operations and solve the problems of delivery failures, pick-up points and self-delivery boxes are being implemented in China. This study investigates three home delivery models including traditional model, pick-up point (PP) model and self-delivery box (SDB) model. Under each model, carrier’s delivery distance and customer’s collection distance are calculated. According to the distance, cost of the three delivery models are compared. To simulate carrier’s delivery route, an inventive ant colony algorithm combined with genetic algorithm (GAAA) is developed to optimize delivery route in this research.

Evolution of Tensile Properties of Compacted Red Clay under Wet and Dry Cycles

Ling Zeng,Hui-Cong Yu,Qian-Feng Gao,Jie Liu,Zi-Han Liu 대한토목학회 2022 KSCE Journal of Civil Engineering Vol.26 No.2

Tensile strength is an important soil parameter that affects the stability of structures built on clayey soils. This paper presents an experimental study of the change of tensile properties of red clay during wet-dry cycles. Cyclic wet-dry tests were performed on compacted red clay specimens with different initial water contents and dry densities. Direct tensile tests and Brazilian split tests were then conducted on these specimens to determine the soil strengths. The effects of initial water content, initial dry density, number of wet-dry cycles, and crack rate on the tensile properties of red clay were investigated. The results demonstrate that the tensile strength of red clay is generally 1.566 times the splitting strength. Both the tensile strength and splitting strength are negatively correlated with the initial water content but are positively correlated with the initial dry density. Because of the presence of desiccation cracks, the tensile strength goes on reducing under wet-dry cycles. The tensile strength can be expressed by a power function of the initial water content, initial dry density, and crack rate. The proposed equation is useful to evaluate the tensile strength of cracked soils subjected to wet-dry cycles.