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| 1 | Drawdown mechanism of light particles in baffled stirred tank for the KR desulphurization process显示文摘To improve the efficiency of the desulfurization process, the drawdown mechanism of light particles in stirred tank is studied in this paper. For both up and down pumping modes, the just drawdown speeds(Njd) of floating particles in transformative Kanbara Reactor(KR) are measured in one and four baffled stirred tanks experimentally. Then numerical simulations with standard k-ε model coupled with volume of fluid model(VOF) and discrete phase model(DPM) are conducted to analyze the flow field at the just drawdown speed Njd. The torques on the impeller obtained from experiments and simulations agree well with each other, which indicates the validity of our numerical simulations. Based on the simulations, three main drawdown mechanisms for floating particles, the axial circulation, turbulent fluctuation and largescale eddies, are analyzed. It's found that the axial circulation dominates the drawdown process at small submergence(S = 1/4 T and 1/3 T) and the large-scale eddies play a major role at large submergence(S = 2/3 T and 3/4 T). Besides, the turbulent fluctuation affects the drawdown process significantly for up pumping mode at small submergence(S = 1/4 T and 1/3 T) and for down pumping mode at large submergence(S = 2/3 T and 3/4 T). This paper helps to provide a more comprehensive understanding of the KR desulphurizer drawdown process in the baffled stirred tank. | Meng Li Yangbo Tan Jianglong Sun De Xie Zeng Liu | 2019 | Chinese Journal of Chemical Engineering2019，27，2： | 8 |
| 2 | Functoriality of automorphic L-functions through their zeros显示文摘Let E be a Galois extension of Q of degree , not necessarily solvable. In this paper we first prove that the L-function L(s,π) attached to an automorphic cuspidal representation π of GLm(EA) cannot be factored nontrivially into a product of L-functions over E. Next, we compare the n-level correlation of normalized nontrivial zeros of L(s,π1)···L(s,πk), where πj, j = 1,...,k, are automorphic cuspidal representations of GLmj(QA), with that of L(s,π). We prove a necessary condition for L(s,π) having a factorization into a product of L-functions attached to automorphic cuspidal representations of specific GLmj(QA), j = 1,...,k. In particular, if π is not invariant under the action of any nontrivial σ∈ GalE/Q, then L(s,π) must equal a single L-function attached to a cuspidal representation of GLm (QA) and π has an automorphic induction, provided L(s,π) can factored into a product of L-functions over Q. As E is not assumed to be solvable over Q, our results are beyond the scope of the current theory of base change and automorphic induction. Our results are unconditional when m,m1,...,mk are small, but are under Hypothesis H and a bound toward the Ramanujan conjecture in other cases. | LIU JianYa YE YangBo | 2009 | Science China Mathematics2009，52，1： | 2 |
| 3 | Spatial variability of soil organic carbon and total nitrogen in the hilly red soil region of Southern China显示文摘To obtain accurate spatial distribution maps of soil organic carbon(SOC)and total nitrogen(TN)in the Hetian Town in Fujian Province,China,soil samples from three depths(0–20,20–40,and 40–60 cm)at 59 sampling sites were sampled by using traditional analysis and geostatistical approach.The SOC and TN ranged from 2.26 to 47.54 g kg-1,and from 0.28 to 2.71 g kg-1,respectively.The coefficient of variation for SOC and TN was moderate at 49.02–55.87%for all depths.According to the nuggetto-sill ratio values,a moderate spatial dependence of SOC content and a strong spatial dependence of TN content were found in different soil depths,demonstrating that SOC content was affected by both extrinsic and intrinsic factors while TN content was mainly influenced by intrinsic factors.Indices of cross-validation,such as mean error,mean standardized error,were close to zero,indicating that ordinary kriging interpolation is a reliable method to predict the spatial distribution of SOC and TN in different soil depths.Interpolation using ordinary kriging indicated the spatial pattern of SOC and TN were characterized by higher in the periphery and lower in the middle.To improve the accuracy of spatial interpolation for soil properties,it is necessary and important to incorporate a probabilistic and machine learning methods in the future study. | Xiong Yao Kunyong Yu Yangbo Deng Jian Liu Zhuangjie Lai | 2020 | Journal of Forestry Research2020，31，6： | 2 |
| 4 | Electrical and mechanical performance of graphene sheets exposed to oxidative environments显示文摘当暴露了到不同媒介时, Graphene 涂层被显示了保护内在的材料免受氧化的伤害。然而,在在房间温度的空中的 graphene 的使钝化的性质,对应于许多电子设备的操作条件,仍然保持不清楚。在这个工作,我们为时间的长时期在房间温度在空中分析 graphene/Cu 样品的氧化动力学(从 1 天到 113 天)用扫描电子显微镜学,传导性的原子力量显微镜学和钻电子显微镜学,并且我们把结果与那些为在 H2O2 对待的类似的样品获得了作比较。我们不同于暴露于 H2O2,在 graphene 领域边界的氧的累积在演变在的 graphene 表观察那一很控制了并且进步方法,在空中的 graphene 的本地氧化以一种混乱方式发生。在两个盒子中,在 graphene 领域边界形成的氧化物小丘能宣传到领域直到到达限制宽度和高度。我们的结果证明沿着域边界的内在的材料的本地氧化能戏剧性地减少粗糙,传导性,机械抵抗和 graphene 表的摩擦特征,哪个还原剂整个设备的性能。 | Mario Lanza Yan Wang Teng Gao Albin Bayerl Marc Porti Montserrat Nafria Yangbo Zhou Guangyin Jing Yanfeng Zhang Zhongfan Liu Dapeng Yu Huiling Duan | 2013 | Nano Research2013，6，7： | 2 |
| 5 | Anisotropic in-plane thermal conductivity for multi-layer WTe_(2)显示文摘Improving thermal transport between substrate and transistors has become a vital solution to the thermal challenge in nanoelectronics.Recently 2D WTe_(2) has sparked extensive interest because of heavy atomic mass and low Debye temperature.Here,the thermal transport of supported WTe_(2) was studied via Raman thermometry with electrical heating.The supported 30 nm WTe2 encased with 70 nm Al_(2)O_(3) delivered 4.8 W·m^(-1)·K^(-1)in-plane thermal conductivity along zigzag direction at room temperature,which was almost 1.6 times larger than that along armchair direction(3.0 W·m^(-1)·K^(-1)).Interestingly,the superior and inferior directions for thermal transport are just opposite of those for electrical transport.Hence,a heat manipulation model in WTe_(2) FET device was proposed.Within the designed configuration,waste heat in WTe_(2) would be mostly dissipated to metal contacts located along zigzag,relieving the local temperature discrepancy in the channel effectively and preventing degradation or breakdown.Our study provides new insight into thermal transport of anisotropic 2D materials,which might inspire energy-efficient nanodevices in the future. | Yuehua Wei Chuyun Deng Xiaoming Zheng Yangbo Chen Xiangzhe Zhang Wei Luo Yi Zhang Gang Peng Jinxin Liu Han Huang Weiwei Cai Qi Ge Renyan Zhang Xueao Zhang Shiqiao Qin | 2022 | Nano Research2022，15，1： | 1 |
| 6 | Highly in-plane anisotropy of thermal transport in suspended ternary chalcogenide Ta_(2)NiS_(5)显示文摘Energy dissipation has always been an attention-getting issue in modern electronics and the emerging low-symmetry two-dimensional(2D)materials are considered to have broad prospects in solving the energy dissipation problem.Herein the thermal transport of a typical 2D ternary chalcogenide Ta_(2)NiS_(5) is investigated.For the first time we have observed strongly anisotropic in-plane thermal conductivity towards armchair and zigzag axes of suspended few-layer Ta_(2)NiS_(5) flakes through Raman thermometry.For 7-nm-thick Ta_(2)NiS_(5) flakes,theκz i g z a g is 4.76 W·m^(−1)·K^(−1) andκa r m c h a i r is 7.79 W·m^(−1)·K^(−1),with a large anisotropic ratio(κa r m c h a i r/κz i g z a g)of 1.64 mainly ascribed to different phonon mean-free-paths along armchair and zigzag axes.Moreover,the thickness dependence of thermal anisotropy is also discussed.As the flake thickness increases,theκa r m c h a i r/κz i g z a g reduces sharply from 1.64 to 1.07.This could be attributed to the diversity in phonon boundary scattering,which decreases faster in zigzag direction than in armchair direction.Such anisotropic property enables heat flow manipulation in Ta_(2)NiS_(5) based devices to improve thermal management and device performance.Our work helps reveal the anisotropy physics of ternary transition metal chalcogenides,along with significant guidance to develop energy-efficient next generation nanodevices. | Yue Su Chuyun Deng Jinxin Liu Xiaoming Zheng Yuehua Wei Yangbo Chen Wei Yu Xiao Guo Weiwei Cai Gang Peng Han Huang Xueao Zhang | 2022 | Nano Research2022，15，7： | 1 |
| 7 | Time structure of locomotor activity in mice kept on different light-dark cycles显示文摘 | YangBo Liu Yanyou Wang Yuhui Wang | 2007 | Bi- ological Rhythm Research2007，38，6： | 1 |
| 8 | A proof of Selberg’s orthogonality for automorphic L-functions显示文摘 | Jianya Liu Yonghui Wang Yangbo Ye | 2005 | manuscripta mathematica2005，，2： | 1 |
| 9 | Perron' s formula and the prime number theorem for automophic L-functions显示文摘 | Jianya Liu and Yangbo Ye | 2007 | Pure Appl Math2007，3，： | 1 |
| 10 | Subconvexity for Rankin-Selberg L-Functions of Maass Forms显示文摘 | Jianya Liu Yangbo Ye | 2002 | Geometrical and Functional Analysis GAFA2002，，6： | 1 |
| 11 | Time structure of locomotor activity in mice kept on different light-dark eycles显示文摘 | YangBo Liu Yanyou Wang Yuhui Wang | 2007 | Biological Rhythm Research2007，38，6： | 1 |
| 12 | Highly anisotropic thermal conductivity of few-layer CrOCl for efficient heat dissipation in graphene device显示文摘With the packing density growing continuously in integrated electronic devices,sufficient heat dissipation becomes a serious challenge.Recently,dielectric materials with high thermal conductivity have brought insight into effective dissipation of waste heat in electronic devices to prevent them from overheating and guarantee the performance stability.Layered CrOCl,an antiferromagnetic insulator with low-symmetry crystal structure and atomic level flatness,might be a promising solution to the thermal challenge.Herein,we have systematically studied the thermal transport of suspended few-layer CrOCl flakes by microRaman thermometry.The CrOCl flakes exhibit high thermal conductivities along zigzag direction,from~392±33 to~1,017±46 W·m^(−1)·K^(−1) with flake thickness from 2 to 50 nm.Besides,pronounced thickness-dependent thermal conductivity ratio(/from~2.8±0.24 to~4.3±0.25)has been observed in the CrOCl flakes,attributed to the discrepancy of phonon dispersion and phonon surface scattering.As a demonstration to the heat sink application of layered CrOCl,we then investigate the energy dissipation in graphene devices on CrOCl,SiO_(2) and hexagonal boron nitride(h-BN)substrates,respectively.The graphene device temperature rise on CrOCl is only 15.4%of that on SiO_(2) and 30%on h-BN upon the same electric power density,indicating the efficient heat dissipation of graphene device on CrOCl.Our study provides new insights into two-dimentional(2D)dielectric material with high thermal conductivity and strong anisotropy for the application of thermal management in electronic devices. | Xiaoming Zheng Yuehua Wei Zhenhua Wei Wei Luo Xiao Guo Xiangzhe Zhang Jinxin Liu Yangbo Chen Gang Peng Weiwei Cai Shiqiao Qin Han Huang Chuyun Deng Xueao Zhang | 2022 | Nano Research2022，15，10： | 1 |
| 13 | A proof of Selberg’s orthogonality for automorphic L-functions显示文摘 | Jianya Liu Yonghui Wang Yangbo Ye | 2005 | manuscripta mathematica2005，，2： | 1 |
| 14 | A proof of Selberg’s orthogonality for automorphic L-functions显示文摘 | Jianya Liu Yonghui Wang Yangbo Ye | 2005 | manuscripta mathematica2005，，2： | 1 |
| 15 | Effects of surface vortex on the drawdown and dispersion of floating particles in stirred tanks显示文摘The effects of surface vortex on the drawdown and dispersion of floating particles in stirred tanks were investigated.Particle distribution and power consumption were analyzed by experiments and numerical simulations in both baffled and unbaffled tanks agitated by a Rushton impeller.In unbaffled tanks,a non-aggregation rule was applied and the average dispersion index was found to serve as a reasonable prediction of the full drawdown of floating particles.The critical impeller speeds in an unbaffled tank were higher than those in a tank with vertical baffles.At each immersion depth in a baffled tank,particles distributed more uniformly and more power was consumed.Comparison of snapshots of the baffled and unbaffled tanks shows that the surface vortex increases the drawdown speed while it decreases the particle distribution uniformity and power consumption.Therefore,the use of baffles to suppress the surface vortex provides for a more uniform particle distribution in stirred tanks. | Wentao Xu Yangbo Tan Meng Li Jianglong Sun De Xie Zeng Liu | 2020 | Particuology2020，18，2： | 0 |
| 16 | A Novel Maximum Resolved Shear Stress Gradient Criterion and Its Application for Crack Deflection Behavior in Polycrystalline Silicon Materials显示文摘In this paper,a development of new resolved shear stress gradient criteria is performed for the study of crack propagation behavior in polycrystalline materials with an emphasis on the effect of slip plane and slip direction.The prediction of crack deflection behavior by the maximum resolved shear stress gradient criterion shows good agreement with the experimental results.Comparison study for the prediction of crack propagation behavior in poly crystalline materials by other criteria demonstrates that the maximum resolved shear stress gradient criterion is superior to other fracture criteria.This suggests that the new criterion could be further applied for predicting the crack deflection behavior in other polycrystalline materials. | Yangbo Zhang Qida Liu Qun Li Yangdong Ni Yuanjie Yu Jean-Nicolas Jaubert Eric Lajoie-Mazenc Emmanuel Boyere Metais Thomas Hong Zuo | 2022 | Acta Mechanica Solida Sinica2022，35，3： | 0 |
| 17 | Reduced-Order Observer-Based Leader-Following Formation Control for Discrete-Time Linear Multi-Agent Systems显示文摘Formation control of discrete-time linear multi-agent systems using directed switching topology is considered in this work via a reduced-order observer, in which a formation control protocol is proposed under the assumption that each directed communication topology has a directed spanning tree. By utilizing the relative outputs of neighboring agents, a reduced-order observer is designed for each following agent. A multi-step control algorithm is established based on the Lyapunov method and the modified discrete-time algebraic Riccati equation. A sufficient condition is given to ensure that the discrete-time linear multi-agent system can achieve the expected leader-following formation.Finally, numerical examples are provided so as to demonstrate the effectiveness of the obtained results. | Zhongxin Liu Yangbo Li Fuyong Wang Zengqiang Chen | 2021 | IEEE/CAA Journal of Automatica Sinica2021，8，10： | 0 |
| 18 | Spatial variability of soil chemical properties of Moso bamboo forests of China显示文摘This study investigates the spatial variability of soil organic matter(SOM),soil organic carbon(SOC)and pH in the upper 20-cm layer and 20-40 cm layer in Moso bamboo(Phyllostachys pubescens Pradelle)forests using a geostatistics model.Interpolation maps of SOM,SOC,and pH were developed using ordinary kriging(OK)and inverse distance weighted(IDW)methods.The pH,SOC,and SOM of the two soil layers ranged from 4.6 to 4.7,from 1.5 to 2.7 g kg^(-1)and from 20.3 to 22.4 g kg^(-1),respectively.The coefficient of variation for SOM and SOC was 29.9-43.3%while a weak variability was found for pH.Gaussian and exponential models performed well in describing the spatial variability of SOC contents with R^(2)varying from 0.95 to 0.90.The nugget/sill values of pH are less than 25%,which indicates a strong spatial correlation,while the nugget/sill values of SOC and SOM fall under moderate spatial correlation.Interpolation using ordinary kriging and inverse distance weighted methods revealed that the spatial distribution of SOM,SOC,and pH was inconsistent due to external and internal factors across the plots.Regarding the cross-validation results,the ordinary kriging method performed better than inverse distance weighted method for selected soil properties.This study suggests that the spatial variability of soil chemical properties revealed by geostatistics modeling will help decision-makers improve the management of soil properties. | Regassa Terefe Kun-yong Yu Yangbo Deng Xiong Yao Fan Wang Jian Liu | 2021 | Journal of Forestry Research2021，32，6： | 0 |
| 19 | Improving fatigue strength of bainite/martensite dual-phase steels in very high cycle fatigue regime by refining microstructures显示文摘Very high cycle fatigue behaviors of two bainite/martensite dual-phase steels were investigated.One of the steels was cyclic rapid heat treated and its microstructures were refined. Fatigue strength of the steel is 225 MPa higher than that without refining.Observation of fracture surfaces show that the fatigue cracks initiate at bainites for non-refined steel and at non-metallic inclusions for the refined steel.The size of inclusions is much smaller than that of bainites which results in the improvement of fatigue strength. | Yangbo Liu Shouxin Li Zhengou Yang Jingyu Cui Jialin Gu Bingzhe Bai | 2012 | Theoretical & Applied Mechanics Letters2012，2，3： | 0 |
| 20 | Effect of layer thickness and voxel size inversion on leaf area density based on the voxel-based canopy profiling method显示文摘Voxel-based canopy profiling is commonly used to determine small-scale leaf area.Layer thickness and voxel size impact accuracy when using this method.Here,we determined the optimal combination of layer thickness and voxel size to estimate leaf area density accurately.Terrestrial LiDAR Stonex X300 was used to generate point cloud data for Masson pines(Pinus massoniana).The canopy layer was stratified into 0.10-1.00-m-thick layers,while voxel size was 0.01-0.10 m.The leaf area density of individual trees was estimated using leaf area indices for the upper,middle,and lower canopy and the overall canopy.The true leaf area index,obtained by layered harvesting,was used to verify the inversion results.Leaf area density was inverted by nine combinations of layer thickness and voxel size.The average relative accuracy and mean estimated accuracy of these combined inversion results exceeded 80%.When layer thickness was 1.00 m and voxel size 0.05 m,inversion was closest to the true value.The average relative accuracy was 92.58%,mean estimated accuracy 98.00%,and root mean square error 0.17.The combination of leaf area density and index was accurately retrieved.In conclusion,nondestructive voxel-based canopy profiling proved suitable for inverting the leaf area density of Masson pine in Hetian Town,Fujian Province. | Yan Chen Jian Liu Xiong Yao Yangbo Deng Zhenbang Hao Lingchen Lin Nankun Wu Kunyong Yu | 2022 | Journal of Forestry Research2022，33，5： | 0 |
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