Lysinibacillus tabacifolii sp. nov., a Novel Endophytic Bacterium Isolated from Nicotiana tabacum Leaves

Yan-Qing Duan,Song-Tao He,Qing-Qing Li,Ming-Feng Wang,Wen-Yuan Wang,Wei Zhe,Yong-Hong Cao,Ming-He Mo,Yu-Long Zhai,Wen-Jun Li 한국미생물학회 2013 The journal of microbiology Vol.51 No.3

A Gram-positive, catalase- and oxidase-positive, strictly aerobic, endospore-forming rod bacterium, designated K3514T, was isolated from the leaves of Nicotiana tabacum. The strain was able to grow at temperatures of 8–40°C, pH 5.0–10.0 and NaCl concentrations of 0–7%. The predominant quinones (>30%) of this strain were MK-7(H2) and MK-7. Phylogenetic analysis of 16S rRNA gene sequence showed that strain K3514T was affiliated to the genus Lysinibacillus, with its closest relatives being Lysinibacillus mangiferihumi (98.3% sequence similarity), Lysinibacillus sphaericus (97.9% sequence similarity), Lysinibacillus fusiformis (97.4% sequence similarity), and Lysinibacillus xylanilyticus (97.3% sequence similarity). However, low levels of DNA-DNA relatedness values suggested that the isolate was distinct from the other closest Lysinibacillus species. Additionally, based on analysis of morphological, physiological, and biochemical characteristics, the isolate could be differentiated from the closest known relatives. Therefore, based on polyphasic taxonomic data, the novel isolate likely represents a novel species, for which the name Lysinibacillus tabacifolii sp. nov. and the type strain K3514T (=KCTC 33042T =CCTCC AB 2012050T) are proposed.

Microstructure and Properties of Er - SiOX Films Synthesized by Ion Beam Assisted Deposition

Gao Song Duan,Shu Qing Zheng,Xiao Juan Zhang,Qing Yu,Wang Liang 한국진공학회(ASCT) 2002 Journal of Korean Vacuum Science & Technology Vol.6 No.2

Er doped SiO_x films have been synthesized by ion beam assisted deposition (IBAD). The morphology and microstructure of films and their annealing behaviors have been examined by using scanning electron microscopy and x-ray diffraction. The composition and properties of films have been systematically investigated.

Electrode properties of porous La2NiO4+δ layers screen-printed on a Ce0.8Sm0.2O2-δ electrolyte

Qing Xu,Bok-Hee Kim,Kai Zhao,Duan-Ping Huang,Min Chen,Hong Wang 한양대학교 세라믹연구소 2009 Journal of Ceramic Processing Research Vol.10 No.2

A La2NiO4+δ/Ce0.8Sm0.2O2-δ/La2NiO4+δ symmetrical cell was prepared using a screen-printing method by sintering at 1100℃. The electrochemical properties of the cell were examined by the impedance spectroscopy technique under zero dc bias in air between 500-700℃. The La2NiO4+δ electrodes displayed satisfactory chemical and thermodynamic compatibilities with the Ce0.8Sm0.2O2-δ electrolyte. A comparatively low area specific resistance of 0.18 Ω cm2 at 700℃ was determined for the La2NiO4+δ electrodes. Scanning electron microscope (SEM) observation revealed that the La2NiO4+δ electrodes showed a reasonable porosity, a well-necked connection among fine grains and a tight adhesion to the electrolyte support. The desired microstructure is regarded to be responsible for the superior electrode properties of the La2NiO4+δ layers. A La2NiO4+δ/Ce0.8Sm0.2O2-δ/La2NiO4+δ symmetrical cell was prepared using a screen-printing method by sintering at 1100℃. The electrochemical properties of the cell were examined by the impedance spectroscopy technique under zero dc bias in air between 500-700℃. The La2NiO4+δ electrodes displayed satisfactory chemical and thermodynamic compatibilities with the Ce0.8Sm0.2O2-δ electrolyte. A comparatively low area specific resistance of 0.18 Ω cm2 at 700℃ was determined for the La2NiO4+δ electrodes. Scanning electron microscope (SEM) observation revealed that the La2NiO4+δ electrodes showed a reasonable porosity, a well-necked connection among fine grains and a tight adhesion to the electrolyte support. The desired microstructure is regarded to be responsible for the superior electrode properties of the La2NiO4+δ layers.

PERTURBATION ANALYSIS FOR THE POSITIVE DEFINITE SOLUTION OF THE NONLINEAR MATRIX EQUATION $X-\sum^m_{i=1}A^{\ast}_iX^{\delta_i}A_i=Q$

Duan, Xue-Feng,Wang, Qing-Wen,Li, Chun-Mei The Korean Society for Computational and Applied M 2012 Journal of applied mathematics & informatics Vol.30 No.3

Based on the elegant properties of the spectral norm and Thompson metric, we firstly give two perturbation estimates for the positive definite solution of the nonlinear matrix equation $$X-\sum^m_{i=1}A^{\ast}_iX^{\delta_i}A_i=Q(0<|{\delta}_i|<1)$$ which arises in an optimal interpolation problem.

Design formulas for vibration control of sagged cables using passive MR dampers

Yuanfeng Duan,Yi-Qing Ni,Hongmei Zhang,Billie F. Jr. Spencer,Jan-Ming Ko,Shenghao Dong 국제구조공학회 2019 Smart Structures and Systems, An International Jou Vol.23 No.6

In this paper, a method for analyzing the damping performance of stay cables incorporating magnetorheological (MR) dampers in the passive control mode is developed taking into account the cable sag and inclination, the damper coefficient, stiffness and mass, and the stiffness of damper support. Both numerical and asymptotic solutions are obtained from complex modal analysis. With the asymptotic solution, analytical formulas that evaluate the equivalent damping ratio of the sagged cable-damper system in consideration of all the above parameters are derived. The main thrust of the present study is to develop an general design formula and a universal curve for the optimal design of MR dampers for adjustable passive control of sagged cables. Two sag-affecting coefficients are derived to reflect the effects of cable sag on the maximum attainable damping ratio and the optimal damper coefficient. For the cable configurations commonly used in cable-stayed bridges, the sag-affecting coefficients are directly expressed in terms of the sag-extensibility parameter to facilitate the control design. A case study on adjustable passive vibration control of the longest cable (536 m) on Stonecutters Bridge is carried out to demonstrate the influence of the sag for the damper design, and to figure out the necessity of adjustability of damper coefficients for achieving maximum damping ratio for different vibration modes.

Head-on Collision Between Two Envelope Solitary Waves in a Granular Medium

Wen-Qing Du,Jian-An Sun,Juan-Fang Han,Wen-Shan Duan,Yang-Yang Yang,Xin Jiang 한국물리학회 2019 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.75 No.11

We investigated the head-on collision between two envelope solitary waves. Head-on collisions between two envelope solitary waves are first discussed in one-dimension (1D) granular chains. The interesting result is that no phase shift or phase delay detected after the head-on collision between two envelope solitary waves. The maximum amplitude during the head-on collision between two envelope solitary waves is also found to be less than the sum of the amplitudes of the two envelope solitary waves, but is larger than the amplitude of the either of the envelope solitary waves.

Rapid removal of low concentrations of mercury from wastewater using coal gasification slag

Liangyan Duan,Xiude Hu,Deshuai Sun,Yongzhuo Liu,Qing-Jie Guo,Tongkai Zhang,Botao Zhang 한국화학공학회 2020 Korean Journal of Chemical Engineering Vol.37 No.7

Coal gasification slag (CGS) is a carbon-containing solid waste used as an adsorbent to remove low concentrations of mercury from wastewater in a series of batch tests to assess its adsorption properties and safe storage. The results showed that the adsorption of mercury on CGS was a very rapid and efficient process, and adsorption equilibrium was reached in only 10-40 min. A pseudo-second-order kinetics model provided a better fit to the equilibrium data. The adsorption capacity on CGS was just slightly below the value of active carbon. CGS showed the highest mercury removal efficiency at a solution pH of 4. Although the presence of other metal cations and anions affected the adsorption, CGS showed good selectivity for mercury ions. The adsorption of mercury was not affected by low concentrations of Cr3+ or Cu2+. The negative interference of anions on the removal efficiency followed the order: Cl>H2PO4 > CO3 2. The adsorption mechanism related to the functional groups included ion exchange, precipitation, coordination complexation, and surface complexation. Mercury adsorbed on CGS leached very slowly in weakly acidic or basic solution. All results of the study indicate that CGS is an economical and safe adsorbent for potential industrial applications.

Design formulas for vibration control of taut cables using passive MR dampers

Yuanfeng Duan,Yi-Qing Ni,Hongmei Zhang,Billie. F., Jr. Spencer,Jan-Ming Ko,Yi Fang 국제구조공학회 2019 Smart Structures and Systems, An International Jou Vol.23 No.6

Using magnetorheological (MR) dampers in multiswitch open-loop control mode has been shown to be cost-effective for cable vibration mitigation. In this paper, a method for analyzing the damping performance of taut cables incorporating MR dampers in open-loop control mode is developed considering the effects of damping coefficient, damper stiffness, damper mass, and stiffness of the damper support. Making use of a three-element model of MR dampers and complex modal analysis, both numerical and asymptotic solutions are obtained. An analytical expression is obtained from the asymptotic solution to evaluate the equivalent damping ratio of the cable-damper system in the open-loop control mode. The individual and combined effects of the damping coefficient, damper stiffness, damper mass and stiffness of damper support on vibration control effectiveness are investigated in detail. The main thrust of the present study is to derive a general formula explicitly relating the normalized system damping ratio and the normalized damper parameters in consideration of all concerned effects, which can be easily used for the design of MR dampers to achieve optimal open-loop vibration control of taut cables.

Two New Natural Products from the Fruits of Alpinia oxyphylla with Inhibitory Effects on Nitric Oxide Production in Lipopolysaccharide- Activated RAW264.7 Macrophage Cells

Zhang Jun Qing,Duan Jin Ao,Wang Yong,Li Yong Hui,Lai Wei Yong,Li Hai Long,Pei Li Xia 대한약학회 2012 Archives of Pharmacal Research Vol.35 No.12

Chemical investigation of the fruits of Alpinia oxyphylla led to an isolation of the two new natural products, 9-hydroxy epinootkatol (1) and (S)-2-pentanol-2-O-β-D-glucopyranoside (2), in addition to the nine known compounds, pinocembrin (3), tectochrysin (4), izalpinin (5), nookatone (6), yakuchinone A (7), protocatechuic acid (8), β-sitosterol (9), daucosterol (10) and β-sitosterol palmitate (11). Their structures were elucidated on the basis of physicochemical constants and NMR spectral data analysis. The effects of the isolated components on nitric oxide production in LPS-induced RAW 264.7 macrophages were examined. The two new natural compounds showed inhibitory activities with IC50 values of 21.8 and 32.8 μg/mL, respectively.

Comparison of different iterative schemes for ISPH based on Rankine source solution

Xing Zheng,Qing-wei Ma,Wen-yang Duan 대한조선학회 2017 International Journal of Naval Architecture and Oc Vol.9 No.4

Smoothed Particle Hydrodynamics (SPH) method has a good adaptability for the simulation of free surface flow problems. There are two forms of SPH. One is weak compressible SPH and the other one is incompressible SPH (ISPH). Compared with the former one, ISPH method performs better in many cases. ISPH based on Rankine source solution can perform better than traditional ISPH, as it can use larger stepping length by avoiding the second order derivative in pressure Poisson equation. However, ISPH_R method needs to solve the sparse linear matrix for pressure Poisson equation, which is one of the most expensive parts during one time stepping calculation. Iterative methods are normally used for solving Poisson equation with large particle numbers. However, there are many iterative methods available and the question for using which one is still open. In this paper, three iterative methods, CGS, Bi-CGstab and GMRES are compared, which are suitable and typical for large unsymmetrical sparse matrix solutions. According to the numerical tests on different cases, still water test, dam breaking, violent tank sloshing, solitary wave slamming, the GMRES method is more efficient than CGS and Bi-CGstab for ISPH method.