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- 저자 : Han-Bing Yan (검색결과 22 건)
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Yan Zhang,Bing Ye,Hongling Zheng,Wei Zhang,Lin Han,Peng Yuan,Chao Zhang 대한천식알레르기학회 2019 Allergy, Asthma & Immunology Research Vol.11 No.6
Background: Exposure to organic dust has been widely investigated as a potential risk factor for asthma with different results. To clarify a potential relationship, we performed the present meta-analysis to integrate the results of studies examining the association of organic dust exposure with asthma. Methods: A comprehensive literature search in the electronic databases including EMBASE, PubMed and Cochrane Library databases (up to August 2018) was conducted. The adjusted odds ratios (ORs) with corresponding 95% confidence interval (CI) for organic dust exposure and asthma were retrieved and pooled to generate summary effect estimates in Revman 5.2. Results: Database searches retrieved 1,016 records. A total of 17 studies containing 3,619 cases and 6,585 controls were finally included in our meta-analysis. The summary estimates suggested that organic dust exposure was positively associated with asthma (OR, 1.48; 95% CI, 1.26–1.75; P < 0.00001), whether among population-based case-control studies (OR, 1.24; 95% CI, 1.13–1.35; P < 0.00001) or hospital-based case-control studies (OR, 2.79; 95% CI, 1.27–6.12; P = 0.01). Subgroup analysis showed that paper/wood (OR, 1.62; 95% CI, 1.38–1.90; P < 0.00001), flour/grain (OR, 1.48; 95% CI, 1.11–1.97; P = 0.008), and textile dust (OR, 1.50; 95% CI, 1.08–2.09; P = 0.02) exposure were significantly associated with asthma. Conclusions: Based on the studies evaluated, our meta-analysis results prompt that organic dust exposure is a risk factor inducing asthma, although precise analysis focus on specific organic dust materials is still warranted.
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Electrical characteristics of a discharge in saltwater
Han Zhen,Zhang Xiaobing,Yan Bing,Qiao Liang,Wang Zhigang 한국물리학회 2022 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.80 No.4
Experiments are conducted to reveal the electrical characteristics of a pulsed discharge in saltwater. To check the influence of the electrode material on discharge, we used stainless steel, red copper, and W–Cu alloy (the content of tungsten is 80%) in our experiment. As a result, four different types of discharges are observed: a typical spark discharge, a typical corona discharge, a corona discharge with a bulge, and a mixed spark discharge. In the spark discharge mode, a RLC oscillating circuit is used to describe the current after the breakdown of the electrode gap. Previous studies were mainly done using freshwater; thus, the current in the pre-breakdown period was approximately 0. However, saltwater is full of ions and is highly conductive, which brings about the appearance of a conductive current in the pre-breakdown stage. When the conductive current is considered, we obtain the analytical expression for the current in saltwater by solving the second-order ordinary coefficient differential equation with current as a variable. In combination with the short-circuit method, the constant resistance of the plasma channel is finally calculated. Actually, the channel resistance is not always the same after the breakdown. Based on the actual resistance in the first half-cycle after the breakdown, we propose a time-varying channel resistance model. By data fitting, we determined the coefficients in the time-varying channel resistance model; we also discuss the relationship between the coefficients. The results show that the fitting curve is in good agreement with the measured one.
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Streptomyces lushanensis sp. nov., a novel actinomycete with anti-cyanobacterial activity
Zhang, Bing-Huo,Cheng, Juan,Chen, Wei,Li, Han-Quan,Yang, Jian-Yuan,Park, Dong-Jin,Kim, Chang-Jin,Shen, Rui,Duan, Yan-Qin,Li, Wen-Jun Nature Publishing Group 2015 The Journal of Antibiotics Vol. No.
<P>Strain JXJ 0135(T), an anti-cyanobacterial actinomycete, was isolated from a soil sample collected from Lushan Mountain, south China, and identified by using polyphasic approach. Phylogenetic analysis of the near-complete 16S rRNA gene sequence indicated that strain JXJ 0135(T) belongs to the genus Streptomyces and exhibited distinct subclade and also highest similarity (98.6%) to Streptomyces scopuliridis RB72(T). The strain developed well-branched substrate and aerial mycelia, and produced spiral spore chains. Spores were elliptical and the spore surface was smooth. The strain contained LL-diaminopimelic acid with whole-cell sugars of mannose, rhamnose, glucose and galactose. Phospholipids were diphosphatidylglycerol, phosphatidylethanolamine, phosphatidylinositol mannosides, phosphotidylinositol dimannoside, an unidentified aminophospholipid and an unknown phospholipid. The menaquinones were MK-9(H6) and MK-9(H8). The major components of the fatty acids were anteiso-C15:0, iso-C16:0, anteiso-C17:0, iso-C15:0, C16:0, iso-C17:0 and iso-C14:0. The G+C content was 69.3?mol%. The DNA-DNA hybridization value between JXJ 0135(T) and S. scopuliridis RB72(T) was 41.21.4%. On the basis of the polyphasic data, strain JXJ 0135(T) represents a novel species of the genus Streptomyces, for which the name Streptomyces lushanensis sp. nov. is proposed. The type strain is JXJ 0135(T) (=DSM 42121(T)=JCM 19628(T)=KCTC 29261(T)=KACC 17834(T)=NRRL B-24994(T)).</P>
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Jinquan Zhang,Bing Han,Hui-bing Xie,Wu Tong Yan,Wangwang Li,Jiaping Yu 국제구조공학회 2021 Steel and Composite Structures, An International J Vol.39 No.4
Shear lag effect was a significant mechanical behavior of steel-concrete composite beams, and the effective flange width was needed to consider this effect. However, the effective flange width is mostly determined by static load test. The cyclic vehicle loading cases, which is more practical, was not well considered. This paper focuses on the study of shear lag effect of the concrete slab in the negative moment region under fatigue cyclic load. Two specimens of two-span steel-concrete composite beams were tested under fatigue load and static load respectively to compare the differences in the negative moment region. The reinforcement strain in the negative moment region was measured and the stress was also analyzed under different loads. Based on the OpenSees framework, finite element analysis model of steel-concrete composite beam is established, which is used to simulate transverse reinforcement stress distribution as well as the variation trends under fatigue cycles. With the established model, effects of fatigue stress amplitude, flange width to span ratio, concrete slab thickness and shear connector stiffness on the shear lag effect of concrete slab in negative moment area are analyzed, and the effective flange width ratio of concrete slab under different working conditions is calculated. The simulated results of effective flange width are compared with calculated results of the commonly used specifications, and it is found that the methods in the specifications can better estimate the shear lag effect in concrete slab under static load, but the effective flange width in the negative moment zone under fatigue load has a large deviation.
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Experimental study on creep behavior of fly ash concrete filled steel tube circular arches
Wu T. Yan,Bing Han,Jin Q. Zhang,Hui B. Xie,Li Zhu,Zhong J. Xue 국제구조공학회 2018 Steel and Composite Structures, An International J Vol.27 No.2
Fly ash can significantly improve concrete workability and performance, and recycling fly ash in concrete can contribute to a cleaner environment. Since fly ash influences pozzolanic reactions in concrete, mechanical behaviors of concrete containing fly ash differ from traditional concrete. Creep behaviors of fly ash concrete filled steel tube arch were experimentally investigated for 10% and 30% fly ash replacement. The axes of two arches are designed as circular arc with 2.1 m computed span, 0.24 m arch rise, and their cross-sections are all in circular section. Time dependent deflection and strain of loading and mid-span steel tube were measured, and long term deflection of the model arch with 10% fly ash replacement was significantly larger than with 30% replacement. Considering the steel tube strain, compressive zone height, cross section curvature, and internal force borne by the steel tube, the compressive zone height and structural internal forces increased gradually over time due to concrete creep. Increased fly ash content resulted in more significant neutral axis shift. Mechanisms for internal force effects on neutral axis height were analyzed and verified experimentally.
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Chen, Lei,Yan, Huiying,Xue, Xiangxin,Jiang, Dayu,Cai, Yuxi,Liang, Dongmei,Jung, Young Mee,Han, Xiao Xia,Zhao, Bing SAGE Publications 2017 APPLIED SPECTROSCOPY Vol.71 No.7
<P>In this work, we designed a process to assemble gold nanoparticles onto a three-dimensional (3D) polymer surface, which can then be monitored using surface-enhanced Raman scattering (SERS). This work is the first demonstration of the assembly of gold nanoparticles on a filter film and in situ measurement with Raman spectroscopy. Herein, a polyhexamethylene adipamide (Nylon66) film embedded in the organic filter film was used as a template to fabricate a tunable SERS-active substrate. A 'hotspot''-rich gold-nanoparticle-decorated polymer substrate for SERS was prepared; this substrate exhibited high sensitivity in trace detection of targets. The study was conducted using 4-mercaptobenzoic acid as a probe molecule with the aim of comparing the scattering efficiency and the homogeneity of the Raman signal on selected substrates. In addition, we used the gold-decorated polymer film to detect a biotin-avidin complex. The most powerful advantage of the proposed microanalytical device is the in situ SERS application. The 3D nanoporous structures described in this work hold strong potential for use in various applications such as environmental monitoring and biomolecule detection.</P>
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Proposals for flexural capacity prediction method of externally prestressed concrete beam
Wu-Tong Yan,Liang-Jiang Chen,Bing Han,Feng Wei,Hui-Bing Xie,Jia-Ping Yu 국제구조공학회 2022 Structural Engineering and Mechanics, An Int'l Jou Vol.83 No.3
Flexural capacity prediction is a challenging problem for externally prestressed concrete beams (EPCBs) due to the unbonded phenomenon between the concrete beam and external tendons. Many prediction equations have been provided in previous research but typically ignored the differences in deformation mode between internal and external unbonded tendons. The availability of these equations for EPCBs is controversial due to the inconsistent deformation modes and ignored secondorder effects. In this study, the deformation characteristics and collapse mechanism of EPCB are carefully considered, and the ultimate deflected shape curves are derived based on the simplified curvature distribution. With the compatible relation between external tendons and the concrete beam, the equations of tendon elongation and eccentricity loss at ultimate states are derived, and the geometric interpretation is clearly presented. Combined with the sectional equilibrium equations, a rational and simplified flexural capacity prediction method for EPCBs is proposed. The key parameter, plastic hinge length, is emphatically discussed and determined by the sensitivity analysis of 324 FE analysis results. With 94 collected laboratory-tested results, the effectiveness of the proposed method is confirmed, and comparisons with the previous formulas are made. The results show the better prediction accuracy of the proposed method for both stress increments and flexural capacity of EPCBs and the main reasons are discussed.
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