http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Rui Xing,Qing-bo Gao,Fa-qi Zhang,Peng-cheng Fu,Jiu-li Wang,Hui-ying Yan,Shi-long-Chen 한국미생물학회 2017 The journal of microbiology Vol.55 No.8
Floccularia luteovirens, as an ectomycorrhizal fungus, is widely distributed in the Qinghai-Tibet Plateau. As an edible fungus, it is famous for its unique flavor. Former studies mainly focus on the chemical composition and genetic structure of this species. However, the phylogenetic relationship between genotypes remains unknown. In this study, the genetic variation and phylogenetic relationship between the genotypes of F. luteovirens in Qinghai-Tibet Plateau was estimated through the analysis on two protein-coding genes (rpb1 and ef-1α) from 398 individuals collected from 24 wild populations. The sample covered the entire range of this species during all the growth seasons from 2011 to 2015. 13 genotypes were detected and moderate genetic diversity was revealed. Based on the results of network analysis, the maximum likelihood (ML), maximum parsimony (MP), and Bayesian inference (BI) analyses, the genotypes H-1, H-4, H-6, H-8, H-10, and H-11 were grouped into one clade. Additionally, a relatively higher genotype diversity (average h value is 0.722) and unique genotypes in the northeast edge of Qinghai- Tibet plateau have been found, combined with the results of mismatch analysis and neutrality tests indicated that Southeast Qinghai-Tibet plateau was a refuge for F. luteovirens during the historical geological or climatic events (uplifting of the Qinghai-Tibet Plateau or Last Glacial Maximum). Furthermore, the present distribution of the species on the Qinghai-Tibet plateau has resulted from the recent population expansion. Our findings provide a foundation for the future study of the evolutionary history and the speciation of this species.
Jing Chen,Ji-Qing Qiu,Peng Shi,Hong-Jiu Yang 제어·로봇·시스템학회 2010 International Journal of Control, Automation, and Vol.8 No.2
In this paper, the problem of stochastic robust stability of time-varying delay neutral system with Markovian jump parameters is investigated. The jumping parameters are considered as a continuous-time, continuous state Markov process. Based on the Lyapunov-Krasovskii functional approach, a new delay-dependent stochastic stability criteria is presented in terms of LMIs. A numerical example is given to illustrate the effectiveness of the developed method.
Xi-yue Liu,Yuan-Qing Wang,Liang Zong,Yun Lin,Yong-Jiu Shi 한국강구조학회 2014 International Journal of Steel Structures Vol.14 No.3
Compared with the conventional steel structure, the high-strength steel structures are at more risk of brittle fracture, especiallyin cold regions. In the present study, a series of tests (such as uniaxial tensile test, Charpy impact test and three-point bendingtest) were carried out at low temperature to investigate the mechanical properties and toughness of Q460C steel and its buttwelded joint, fracture micro-mechanisms were analyzed as well. The ductility indices and the toughness indices all decreasewith temperature decreases, the heat affected zone (HAZ) in welded joint is more critical to fracture than the base material. The fracture toughness of high-strength steel Q460C is relatively lower than the other three conventional steels (i.e. Q235, Q345and Q390). In this study, rich experimental data were collected so as to provide reference for the fracture resistant design ofhigh-strength steel structures in cold regions.
Influencing Factors Analysis of Degradation and Damage and the Effect on Steel Frame
Meng Wang,Yong-Jiu Shi,Yuan-Qing Wang,Wei Guo Yang 한국강구조학회 2015 International Journal of Steel Structures Vol.15 No.1
In order to discuss the influencing factors of damage and degradation and the effect on steel frame subject to strongearthquakes, firstly, a constitutive model was proposed for 3D finite element models to calculate the seismic behaviors of steelframe more accurately. The model was proved correct and applicable due to typical quasi-static tests. Then, based on theverified model, the damage and degradation factors were discussed by parametric analyses, including the panel zone, loadinghistory, loading amplitude, the width to thickness ratio and yield strength. The cumulative damage phenomena of steel frameconnections were further studied and the degradation distribution curve was obtained. Finally, the traditional beam elementmodel and proposed shell element model of structure were established by ABAQUS for time history analysis. The effect ofdamage and degradation on seismic behaviors of steel frames were compared and discussed. The tests and analysis resultsrevealed that: panel zone strength, loading amplitude and width-thickness ratios of plates had significant impact on damage anddegradation behaviors and failure modes of connections. Premature weld cracking would lead to earlier damage and degradationunder “strong to weak” earthquake, which would seriously affect the overall mechanical properties of the structure. Once localbuckling caused damage, the results of the beam element model and accurate shell element model were remarkably different. Beam element model without considering damage and degradation underestimated the structural deformations, which shouldbe paid more attention for design safety.
Li-Li Wu,Xuan-Neng Gao,Yong-Jiu Shi,Yuan-Qing Wang 한국강구조학회 2006 International Journal of Steel Structures Vol.6 No.3
The arch-shaped corugated steel roof is a new type of cold formed thin-waled structure. Since the width-to-thickness ratiosof the plate asemblies of corrugated sections exceed the limits specified in the current design codes, the load-bearingbehavior, especialy loading modes, initial imperfections and boundary conditions, therefore its ultimate load-carying capacityis determined not only by its global stability, but also by its interactive local buckling. In this paper the finite element methodwas aplied to analyze the local buckling behavior of stel arch panels with corrugated trapezium sections. Some tests on theloads to further investigate the loading mechanism of corrugated steel arch panels and the factors refered above. A comparisonbetween the experimental and theoretical results was made, and good agrement was achieved herein. It is shown that therealso exists interactive local buckling among corugated plate assemblies. The experimental results are lower than theoreticalones for axial loading capacity, vice-versa, the former ones are higher for eccentricaly loaded specimens. It is noted that thealso indicate that the trapezium sections have high local buckling capacities, yet they hardly have post-buckling capacities,which are distinctive from that of the plain ones. All these also give some explanations to some corugated steel arch rofscolapsed suddenly in some areas of China.
Fei-Fei Si,Lu Liu,Hai-Mei Li,Li Sun,Qing-Jiu Cao,Hanna Lu,Yu-Feng Wang,Qiu-Jin Qian 대한신경정신의학회 2021 PSYCHIATRY INVESTIGATION Vol.18 No.7
Objective Attention-deficit/hyperactivity disorder (ADHD) is a common neurodevelopmental disorder in children and adolescents. The present study investigated the cortical morphology features and their relationship with working memory (WM). Methods In the present study, a total of 36 medication naïve children with ADHD (aged from 8 to 15 years) and 36 age- and gendermatched healthy control (HC) children were included. The digit span test was used to evaluate WM. The magnetic resonance imaging (MRI) was used to examine the characteristics of cortical morphology. Firstly, we compared the cortical morphology features between two groups to identify the potential structural alterations of cortical volume, surface, thickness, and curvature in children with ADHD. Then, the correlation between the brain structural abnormalities and WM was further explored in children with ADHD. Results Compared with the HC children, the children with ADHD showed reduced cortical volumes in the left lateral superior temporal gyrus (STG) (p=6.67×10-6) and left anterior cingulate cortex (ACC) (p=3.88×10-4). In addition, the cortical volume of left lateral STG was positively correlated with WM (r=0.36, p=0.029). Conclusion Though preliminary, these findings suggest that the reduced cortical volumes of left lateral STG may contribute to the pathogenesis of ADHD and correlate with WM in children with ADHD.