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China Ocean Engineering 2022年第5期36卷 808-813页

作者： wu xiao-yu DU Zhong School of Science Beijing Forestry UniversityBeijing 100083China Department of Mathematics and Physics North China Electric Power UniversityBaoding 071003China

In this paper,we investigate a(3+1)-dimensional generalized variable-coefficient shallow water wave equation,which can be used to describe the flow below a pressure surface in oceanography and atmospheric *** the Kadomtsev−Petviashvili hierarchy reduction,we obtain the semi-rational solutions which describe the lumps and rogue waves interacting with the kink *** find that the lump appears from one kink soliton and fuses into the other on the x−y and x−t ***,on the x−z plane,the localized waves in the middle of the parallel kink solitons are in two forms:lumps and line rogue *** effects of the variable coefficients on the two forms are *** dispersion coefficient influences the speed of solitons,while the background coefficient influences the background’s height.

关键词： variable-coefficient shallow water wave equation lumps linear rogue waves Kadomtsev-Petviashvili hierarchy reduction

Rogue waves of a(3+1)-dimensional BKP equation

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Chinese Physics B 2022年第12期31卷 21-26页

作者： yu-Qiang yuan xiao-yu wu Zhong Du Department of Mathematics China University of Mining and Technology(Beijing)Beijing 100083China School of Science Beijing Forestry UniversityBeijing 100083China Department of Mathematics and Physics North China Electric Power UniversityBaoding 071003China

We investigate certain rogue waves of a(3+1)-dimensional BKP equation via the Kadomtsev-Petviashili hierarchy reduction *** obtain semi-rational solutions in the determinant form,which contain two special interactions:(i)one lump develops from a kink soliton and then fuses into the other kink one;(ii)a line rogue wave arises from the segment between two kink solitons and then disappears *** find that such a lump or line rogue wave only survives in a short time and localizes in both space and time,which performs like a rogue ***,the higher-order semi-rational solutions describing the interaction between two lumps(one line rogue wave)and three kink solitons are presented.

关键词： (3+1)-dimensional BKP equation Kadomtsev-Petviashvili hierarchy reduction interaction rogue wave lump

Hydrolysis kinetics of benzyl phenyl ether in high temperature liquid water

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Chinese Chemical Letters 2011年第6期22卷 733-737页

作者： xiao yu wu Xiu Yang Lu Department of Chemical and Biological Engineering Zhejiang University Hangzhou 310027 China

The application of high temperature liquid water（HTLW） to decomposition of lignin as efficient and green solution for phenolic compounds recovery was *** phenyl ether（BPE）,the lignin model compound,was treated at temperatures ranging from 220 to 250℃.BPE undergo hydrolysis in HTLW,and main products were phenol and benzyl alcohol with the minimum selectivities of 75.7%and 82.8%,*** temperature led to higher selectivity in 220-250℃temperature *** kinetics on BPE hydrolysis was studied and the activation energy was determined as 150.3±12.5 kJ/mol with the first-order kinetic *** on products distribution,the reaction mechanism for decomposition of benzyl phenyl ether was *** investigated process provides insights into the design of a commercial method for utilization of lignin.

关键词： Hydrolysis Kinetics Benzyl phenyl ether High temperature liquid water Lignin model compound

The saproxylic beetle assemblage associated with different host trees in Southwest China

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Insect Science 2008年第3期15卷 251-261页

作者： Jie wu xiao-Dong yu Hong-Zhang Zhou Institute of Zoology Chinese Academy of Sciences Beijing China

Dead wood is a habitat for many insects and other small animals, some of which may be rare or endangered and in need of effective protection. In this paper, saproxylic beetle assemblages associated with different host trees in the subtropical forests in southwestern China were investigated. A total of 277 species （1 439 specimens） in 36 beetle families were collected from 117 dead wood samples, of which 101 samples were identified and respectively belonged to 12 tree genera. The number of saproxylic beetle species varied greatly among logs of different tree genera, with the highest diversity on logs of Juglans. Generally, broad-leaved trees had a higher richness and abundance of saproxylic species than coniferous trees. Cluster analysis revealed that assemblages from broad-leaved tree genera were generally similar （except for Betula） and assemblages from coniferous trees formed another distinct cluster. The subsequent indicator analysis proposed that there are different characteristic species for different cluster groups of host tree genera. In our study, log diameter has no positive influence on beetle species density. Conversely, comparisons of individual-based rarefaction curves suggested that beetle species richness was highest in the small diameter class both in coniferous and broad-leaved tree genera. With increased wood decay, proportion of habitat specialists （saproxylic beetles living on one tree genus） decreased, whereas proportion of habitat generalists （living on more than three tree genera） increased. The beetle species density was found to be higher in early stages, and decreased in later stages as well. A negative influence of altitude on saproxylic beetle species richness and abundance was detected. It was indicated that different tree genera and altitudes possibly display cross effects in modulating the altitudinal distribution and host preference of the beetles.

关键词： China host trees Saproxylic beetle subtropical forest

Graphene quantum dots modulated solution-derived InGaO thin-film transistors and stress stability exploration

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Rare Metals 2023年第7期42卷 2294-2306页

作者： xiao-Fen Xu Gang He Lei-Ni Wang Wen-Hao Wang xiao-yu wu School of Materials Science and Engineering Anhui UniversityHefei230601China

Graphene quantum dots(GQDs)doped InGaO(IGO)thin film transistors(TFTs)have been fabricated based on solution-driven ZrO_(x) as gate *** to pure IGO TFTs,superior electrical performance of the GQDs-IGO TFTs can be achieved by adjusting the doping *** has been demonstrated that GQDs-modified IGO TFTs devices with GQDs doping content of0.3 mg·ml^(-1)have the optimized performances,including field-effect mobility(μ_(FE))of 22.02 cm^(2)·V^(-1)·s^(-1),on/off current ratio(I_(on)/I_(off))of 7.06×10^(7),subthreshold swing(SS)of 0.09 V·dec^(-1),hysteresis of 0.04 V and interfacial trap states(D_(it))of 1.03×10^(12)cm^(-2).In addition,bias stress and illumination stress tests have been performed and excellent stability has been achieved for optimized *** GQDs-IGO TFTs device showed smaller threshold voltage shift of 0.12 and 0.04 V under positive bias stress(PBS)test and negative bias stress(NBS)test for 3600 s,*** it showed smaller threshold voltage shift of 0.27 and 0.34 V for red light under the PBS and NBS test for 3600 s,***,it showed smaller threshold voltage shift of0.20 and 0.22 V for green light under PBS and NBS test for3600 s,*** also showed smaller threshold voltage shift of 0.17 and 0.12 V for blue under the positive bias illumination stress(PBIS)test and negative bias illumination stress(NBIS)test for 3600 s,*** noise(LFN)characteristics of GQDs-IGO/ZrO_(x)TFTs indicated that the noise source came from the fluctuations in ***,a low voltage resistor-loaded unipolar inverter has been built based on GQDs-IGO/ZrO_(x)TFT,demonstrating good dynamic response behavior and a maximum gain of *** experimental results have suggested that solution-processed GQDs-IGO/ZrO_(x)TFT may envision potential applications in low-cost and large-area electronics.

关键词： Graphene quantum dots doped InGaO(GQDs-IGO) Thin-film transistors Stability Inverter Low-frequency noise

Rogue Waves for a (2+1)-Dimensional Coupled Nonlinear Schr?dinger System with Variable Coefficients in a Graded-Index Waveguide

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Communications in Theoretical Physics 2018年第5期69卷 551-557页

作者： Zhong Du Bo Tian xiao-yu wu and yu-Qiang yuan State Key Laboratory of Information Photonics and Optical Communications and School of Science Beijing University of Posts and Telecommunications Beijing 100876 China

Studied in this paper is a(2+1)-dimensional coupled nonlinear Schr?dinger system with variable coefficients,which describes the propagation of an optical beam inside the two-dimensional graded-index waveguide amplifier with the polarization effects. According to the similarity transformation, we derive the type-Ⅰ and type-Ⅱ rogue-wave solutions. We graphically present two types of the rouge wave and discuss the influence of the diffraction parameter on the rogue *** the diffraction parameters are exponentially-growing-periodic, exponential, linear and quadratic parameters, we obtain the periodic rogue wave and composite rogue waves respectively.

关键词： graded-index waveguide (2+l)-dimensional coupled nonlinear Schrodinger system similarity transformation rogue waves variable coefficients

From seawater to hydrogen via direct photocatalytic vapor splitting: A review on device design and system integration

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Frontiers in Energy 2024年第3期18卷 291-307页

作者： Hongxia LI Khaja WAHAB AHMED Mohamed A.ABDELSALAM Michael FOWLER xiao-yu wu Technology Innovation Institute Masdar CityAbu Dhabi 9639United Arab Emirates Department of Chemical Engineering University of WaterlooWaterlooON N2L 3G1Canada Department of Mechanical and Nuclear Engineering Khalifa University of Science and TechnologyAbu Dhabi 127788United Arab Emirates Department of Mechanical and Mechatronics Engineering University of WaterlooWaterlooON N2L 3G1Canada

Solar-driven hydrogen production from seawater attracts great interest for its emerging role in decarbonizing global energy consumption. Given the complexity of natural seawater content, photocatalytic vapor splitting offers a low-cost and safe solution, but with a very low solar-to-hydrogen conversion efficiency. With a focus on cutting-edge photothermal–photocatalytic device design and system integration, the recent research advances on vapor splitting from seawater, as well as industrial implementations in the past decades were reviewed. In addition, the design strategies of the key processes were reviewed, including vapor temperature and pressure control during solar thermal vapor generation from seawater, capillary-fed vaporization with salt repellent, and direct photocatalytic vapor splitting for hydrogen production. Moreover, the existing laboratory-scale and industrial-scale systems, and the integration principles and remaining challenges in the future seawater-to-hydrogen technology were discussed.

关键词： seawater hydrogen photocatalytic vapor splitting solar-driven

Groupoids,Discrete Mechanics,and Discrete Variation

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Communications in Theoretical Physics 2008年第9期50卷 545-550页

作者： GUO Jia-Feng JIA xiao-yu wu Ke ZHAO Wei-Zhong School of Mathematical Science Capital Normal University Beijing 100037 China

After introducing some of the basic definitions and results from the theory of groupoid and Lie algebroid,we investigate the discrete Lagrangian mechanics from the viewpoint of groupoid theory and give the connection ... 详细信息

关键词： groupoids Lie algebroids discrete field discrete variational principle

Identifying suitable habitats of three ungulates in Arjinshan National Nature Reserve,China

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Journal of Mountain Science 2016年第1期13卷 157-168页

作者： SU Xu-kun DONG Shi-kui LIU Shi-liang wu yu WANG Xue-xia ZHANG Yong wu xiao-yu State Key Laboratory of Water Environment Simulation School of EnvironmentBeijing Normal University

Arjinshan National Nature Reserve(ANNR) is one of 3 refuges of the endemic ungulates Tibetan wild ass(Equus kiang),Chiru(Pantholops hodgsonii) and wild yak(Bos mutus) that are endangered by natural and anthropogenic factors in the Qinghai-Tibetan Plateau(QTP).Identifying habitat suitability is critical for species protection *** used a GIS-based niche model to delimit and classify habitat suitability using an integrated assessment system,which included 9 biotic and abiotic *** divided the research area into 4 habitat types for these ungulates:(1) high suitability habitat;(2) moderate suitability habitat;(3) low suitability habitat;and(4) unsuitable *** suggested that chiru have the most areas of high and moderate suitability habitats while Tibetan wild ass had the largest areas of low suitability habitat and unsuitable *** yak had the largest area of moderate and low suitability habitat,but high suitability habitats for wild yak were smaller than those of other 2 *** was overlap of high-quality habitat for the three kinds of ungulates in the vicinity of Kardun inspection station,which could be regarded as the core area for the coexistence and conservation of these endangered ungulate populations.

关键词： suitability habitat Reserve moderate inspection endemic populations Tibetan anthropogenic coexistence

A Bregman-Style Improved ADMM and its Linearized Version in the Nonconvex Setting:Convergence and Rate Analyses

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Journal of the Operations Research Society of China 2024年第2期12卷 298-340页

作者： Peng-Jie Liu Jin-Bao Jian Hu Shao xiao-Quan Wang Jia-Wei Xu xiao-yu wu School of Mathematics Jiangsu Center for Applied MathematicsChina University of Mining and TechnologyXuzhou 221116JiangsuChina School of Mathematics and Physics Center for Applied Mathematics of GuangxiGuangxi Minzu UniversityNanning 530006GuangxiChina Department of Civil and Environmental Engineering The Hong Kong Polytechnic UniversityHong KongChina School of Mathematics and Computational Science Xiangtan UniversityXiangtan 411105HunanChina

This work explores a family of two-block nonconvex optimization problems subject to linear *** first introduce a simple but universal Bregman-style improved alternating direction method of multipliers(ADMM)based on the iteration framework of ADMM and the Bregman ***,we utilize the smooth performance of one of the components to develop a linearized version of *** to the traditional ADMM,both proposed methods integrate a convex combination strategy into the multiplier update *** each proposed method,we demonstrate the convergence of the entire iteration sequence to a unique critical point of the augmented Lagrangian function utilizing the powerful Kurdyka–Łojasiewicz property,and we also derive convergence rates for both the sequence of merit function values and the iteration ***,some numerical results show that the proposed methods are effective and encouraging for the Lasso model.

关键词： Nonconvex optimization Alternating direction method of multipliers Kurdyka-Lojasiewicz property Convergence rate