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Shaking Table Model Test of Loess Tunnel Structure under Rainfall
Xinhai Zhou,Xuansheng Cheng,Lei Qi,Ping Wang,Shaofeng Chai,Yinjun Liu 대한토목학회 2021 KSCE JOURNAL OF CIVIL ENGINEERING Vol.25 No.6
A large number of loess tunnels are being built or have been put into operation due to the vigorous development of highways and railways. Due to the broken, porous and multiphase of loess microstructure, the loess will lose its strength rapidly under the loading conditions of rainfall and dynamic, while the shaking table test can be used to simulate this dynamic process much better. Based on the shaking table model of 1/40 loess tunnel and considering the adverse conditions of El-Centro bidirectional seismic wave and rainfall, the seismic response law of loess tunnel is studied in this paper; the damping effect of the loess tunnel structure is discussed by setting the damping layer. The results show that under the action of rainfall and earthquake, the damage of surrounding rock structure precedes that of lining structure; the acceleration of the lining structure changes little under different rainfall conditions, but the strain tends to increase; under the cumulative effect of ground motion, the failure time of surrounding rock structure appears early in the case of heavy rainfall, and the width and depth of crack finally formed are also larger; the setting of damping layer can obviously reduce the strain under different rainfall.
Yannong Xiao,Xinhai Li,Shihuang Wang,Xiangdong Wang,Mingshun Li,Yonglian Zheng 한국유전학회 2004 Genes & Genomics Vol.26 No.4
The selection of reduction of anthesis-silking interval (ASI) in maize breeding is an efficient way to develop maize varieties more tolerant to dry growing conditions. Characterization of the quantitative trait loci (QTL) that controlled the flowering time will be helpful for selection in maize breeding. In this study, flowering time of individuals in a 234 F2:3 family, derived from the cross between inbred lines X178 and B73, was evaluated under well-watered and water-stressed conditions at the same location. SSR (microsatellite) was used to identify flowering time QTL. The results showed that the broad-sense heritability for male flowering time (MFT), female flowering time (FFT) and ASI were 0.72, 0.72 - 0.74 and 0.40 - 0.42, respectively, and ASI was significantly correlated to FFT. Under water-stressed condition, 9, 6 and 6 QTLs were identified for MFT, FFT and ASI, respectively, and individual QTL accounted for approximately 2.88% - 31.65% of the phenotypic variation. Some QTLs for MFT were mapped overlapping with those for FFT and ASI. One QTL on chromosome 9 (near nc134) had the strongest effect on MFT, FTT and ASI. It was suggested that the epistasis contributed to the phenotypic variation of flowering time.
A pressure-transient model for a fractured-vuggy carbonate reservoir with large-scale cave
Peng Chen,Xinhai Wang,Hong Liu,Yongmei Huang,Hao Zhang 한국자원공학회 2016 Geosystem engineering Vol.19 No.2
In the development process of fractured-vuggy carbonate reservoir with large-scale caves, the location and size of cave affect the development program. This paper takes the large-scale cave as equipotential body, treats matrix and fracture as double porous media, and establishes the flow model. Laplace transform is used to simplify the model, and then the model is solved using boundary element method. Considering the wellbore storage effect and skin effect, the bottomhole pressure-transient curve is obtained using Stefest numerical inversion method. Comparing the results of analytical solution and boundary element method in the dual porosity medium illustrate the accuracy of this model. The sensitivity of cave parameters is analyzed. It shows that the larger the cave radius is, the stronger the convex and concave of curve is. The convex is earlier and concave is sooner when cave is closer to the well. The segment of convex keeps longer and the concave margin is greater with the larger compressibility ratio. Finally, as an application example, actual test data from a large-scale cave reservoir is analyzed using this model, and the location and size of cave are obtained. It has a certain significance for the reserve evaluation and well test in this reservoir.
Najeeb ur Rehman Lashari,Mingshu Zhao,Jun Wang,XINHAI HE,Irfan Ahmed,Miao Miao Liang,Songpon Tangsee,Xiaoping Song 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.108 No.-
The energy storage properties of layered metal vanadate, especially alkali metal vanadates have beenextensively studied. Metal vanadates have a more robust electrochemical output in contrast with pristinevanadium oxides. However, the detailed processes underlying the efficiency contrast of vanadates andvanadium oxides have rarely been studied. Herein a facile hydrothermal and low-temperature polymerizationmethod was introduced to synthesize KV3O8 and KV3O8@PPy nanowire bundles as anode materialfor an aqueous rechargeable Lithium batteries. The nanowires are composed of KV3O8·0.59H2O calculatedusing thermal gravimetric analysis (TGA). Successfully synthesized layered vanadium based KV3O80.59H2O (KVO) and KV3O8 0.59H2O@PPy (KVO@PPy) nanowires and investigated the source of theimproved electrochemical efficiency of PPy coated potassium vanadates compared to pristine KVO usingcrystal structure analysis and electrochemical tests. We demonstrated increase in electrochemical stabilityfor KVO@PPy caused by synergistic effect of K+ in vanadate nanowires and PPy coating. In KVO theoxygen atoms have close contact with the K ions, and the stable K+ serve as ‘‘pillars” between interlayersto shield the layered structures from collapse during the charge/discharge phase, while the PPy reducescharge transfer resistance. This research adds helps us design better electrode materials to be used as ananode material for ARLB using alkali metal vanadate.
A Light-weighted Data Collection Method for DNS Simulation on the Cyber Range
( Shuang Li ),( Shasha Du ),( Wenfeng Huang ),( Siyu Liang ),( Jinxi Deng ),( Le Wang ),( Huiwu Huang ),( Xinhai Liao ),( Shen Su ) 한국인터넷정보학회 2020 KSII Transactions on Internet and Information Syst Vol.14 No.8
The method of DNS data collection is one of the most important parts of DNS simulation. DNS data contains a lot of information. When it comes to analyzing the DNS security issues by simulation on the cyber range with customized features, we only need some of them, such as IP address, domain name information, etc. Therefore, the data we need are supposed to be light-weighted and easy to manipulate. Many researchers have designed different schemes to obtain their datasets, such as LDplayer and Thales system. However, existing solutions consume excessive computational resources, which are not necessary for DNS security simulation. In this paper, we propose a light-weighted active data collection method to prepare the datasets for DNS simulation on cyber range. We evaluate the performance of the method and prove that it can collect DNS data in a short time and store the collected data at a lower storage cost. In addition, we give two examples to illustrate how our method can be used in a variety of applications.