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Adsorbed and free gas occurrence characteristics and controlling factors of deep shales in the southern Sichuan Basin,China

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Petroleum Science 2023年第3期20卷 1301-1311页

作者： Shang-Wen Zhou dong-xiao zhang Department of Energy and Resources Engineering College of EngineeringPeking UniversityBejing100871China PetroChina Research Institute of Petroleum Exploration and Development Beijing100083China School of Environmental Science and Engineering Southern University of Science and TechnologyShenzhenGuangdong 518055China

Deep shale gas(3500-4500 m)will be the important succeeding field for the growth of shale gas production in *** the condition of high temperature and high pressure in deep shale gas reservoirs,its gas occurrence characteristics are markedly different from those of medium and shallow *** elucidate the gas occurrence characteristics and controlling factors of deep shales in the Wufeng-Longmaxi Formation,methane adsorption,low-temperature N2,and cO2 adsorption experi-ments were *** results show that in deep shales,the mesopores provide approximately 75%of the total specific surface area(SA)and 90%of the total pore volume(PV).Based on two hypotheses and comparing the theoretical and actual adsorption capacity,it is speculated that methane is adsorbed in deep shale in the form of micropore filling,and free gas is mainly stored in the *** analysis demonstrated that ToC is the key material constraint for the adsorption capacity of deep shale,and micropore SSA is the key spatial *** minerals and mesopore parameters have limited effect on the amount of adsorbed ***,the free gas content ranges from 2.72 m^(3)/t to 6.20 m^(3)/t,with an average value of 4.60 m^(3)/t,and the free gas content ratio is approximately 58%,suggesting that the deep shale gas reservoirs are dominated by free *** ratio may also increase to approximately 70%when considering the formation temperature effect on adsorbed *** density,porosity,and gas saturation are the main controlling factors of free gas content,resulting in significantly larger free gas content in deep shale than in shallower formations.

关键词： Adsorbedgas Free gas Gas occurrence characteristics Deep shale

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Redox-active nanoparticles for inflammatory bowel disease

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Nano Research 2021年第8期14卷 2535-2557页

作者： Qinjuan Ren Si Sun xiao-dong zhang Department of Physics and Tianjin Key Laboratory of Low Dimensional Materials Physics and Preparing Technology School of SciencesTianjin UniversityTianjin 300350China Tianjin Key Laboratory of Brain Science and Neural Engineering Academy of Medical Engineering and Translational MedicineTianjin UniversityTianjin 300072China

Homeostasis of gut microbiota is extremely essential for maintaining nutrient metabolism and regulating immunological *** increasing evidence suggests that inflammatory bowel disease(IBD)is strongly associated with dysregulation of gut *** activated inflammation,excessive reactive oxygen species(ROS)and reactive nitrogen species(RNS)produced by inflammatory cells play a detrimental role in regulating IBD and gut ***/RNS cause damage to the surrounding tissues,including nutrient absorption disorders,intestinal dysmotility and barrier ***,ROS/RNS provide terminal electron receptors for anaerobic respiration and support the bloom of facultative anaerobes,eventually causing gut microbiota ***-active nanoparticles(NPs)with catalytic properties or enzyme-like activities can effectively scavenge ROS/RNS,and selectively target inflamed sites via ultrasmall size-mediated enhanced permeation and retention(EPR)effect,showing great potential to regulate IBD and maintain the homeostasis of gut *** addition,the widespread application of NPs in commercial products 1 has increased their accumulation in healthy organisms,and the biological effects on normal microbiota resulting from long-term exposure of NPs to gastrointestinal tract also need attention.

关键词： gut microbiota IBD ROS/RNS redox-active NPs

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Non-bipartite Graphs with Third Largest Laplacian Eigenvalue Less Than Three

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Acta Mathematica Sinica,English Series 2006年第3期22卷 917-934页

作者： xiao dong zhang Rong LUO Department of Mathematics Shanghai Jiao Tong University Department of Mathematical Sciences Middle Tennessee State University

All bipartite graphs whose third largest Laplacian eigenvalue is less than 3 have been characterized by zhang. In this paper, all connected non-bipartite graphs with third largest Laplacian eigenvalue less than three ... 详细信息

关键词： spectral graph theory Laplacian eigenvalue forbidden subgraph

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The Spectral Radii of Intersecting Uniform Hypergraphs

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Communications on Applied Mathematics and Computation 2021年第2期3卷 243-256页

作者： Peng-Li zhang xiao-dong zhang School of Mathematical Sciences MOE-LSCSHL-MACShanghai Jiao Tong UniversityShanghai 200240China

The celebrated Erdos-Ko-Rado theorem states that given n≥2k,every intersecting k-uni-n-1 form hypergraph G on n vertices has at most(n-1 k-1)*** paper states spectral versions of the Erd6s-_Ko--Rado theorem:let G be an intersecting k-uniform hypergraph on n vertices with n≥***,the sharp upper bounds for the spectral radius of Aα(G)and 2*(G)are presented,where Aα(G)=αD(G)+(1-α).A(G)is a convex linear combination of the degree diagonal tensor D(G)and the adjacency tensor A(G)for 0≤α2k,the extremal hypergraphs which attain the sharp upper bounds are *** proof mainly relies on the Perron-Frobenius theorem for nonnegative tensor and the property of the maximizing connected hypergraphs.

关键词： Erdos-Ko-Rado theorem Intersecting hypergraph Tensor Spectral radius

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Potential Distribution on Random Electrical Networks

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Acta Mathematicae Applicatae Sinica 2011年第3期27卷 549-559页

作者： Da-qian Qian xiao-dong zhang Department of Mathematics Shanghai Jiao Tong University 800 Dongchuan Road Shanghai 200240 China

Let N = （G, c） be a random electrical network obtained by assigning a certain resistance for each edge in a random graph G ∈ G（n, p） and the potentials on the boundary vertices. In this paper, we prove that with ... 详细信息

关键词： Electrical network potential distribution random graphs

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Numerical study via total Lagrangian smoothed particle hydrodynamics on chip formation in micro cutting

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Advances in Manufacturing 2020年第2期8卷 144-159页

作者： Jin-Shi Wang xiao-dong zhang Feng-Zhou Fang State Key Laboratory of Precision Measuring Technology and Instruments Centre of Micro/Nano Manufacturing Technology(MNMT)Tianjin UniversityTianjin 300072People's Republic of China Centre of Micro/Nano Manufacturing Technology(MNMT-Dublin) University College DublinDublinIreland

Numerical simulation is an effective approach in studying cutting *** widely used methods for cutting simulation include finite element analysis and molecular ***,there exist some intrinsic shortcomings when using a mesh-based formulation,and the capable scale of molecular dynamics is extremely *** contrast,smoothed particle hydrodynamics(SPH)is a candidate to combine the advantages of *** is a particle method which is suitable for simulating the large deformation process,and is formulated based on continuum mechanics so that large scale problems can be handled in *** a result,SPH has also become a main way for the cutting *** some issues arise while using conventional SPH to handle solid materials,the total Lagrangian smoothed particle hydrodynamics(TLSPH)is *** instabilities would still occur during the cutting,which is a critical issue to *** paper studies the effects of TLSPH settings and cutting model parameters on the numerical instability,as well as the chip formation *** deformation,stress field and cutting forces are analyzed as *** shows that the hourglass coefficient,critical pairwise deformation and time step are three important parameters to control the stability of the simulation,and a strategy on how to adjust them is provided.

关键词： Cutting Total Lagrangian smoothed particle hydrodynamics(TLSPH) Numerical instability Chip formation

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Spectral radius of uniform hypergraphs and degree sequences

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Frontiers of Mathematics in China 2017年第6期12卷 1279-1288页

作者： dongmei CHEN Zhibing CHEN xiao-dong zhang College of Mathematics and Statistics Shenzhen University Shenzhen 518060 China School of Mathematical Sciences MOE-LSC and SHL-MAC Shanghai Jiao Tong University Shanghai 200240 China

We present several upper bounds for the adjacency and signless Laplacian spectral radii of uniform hypergraphs in terms of degree sequences.

关键词： Spectral radius uniform hypergraph degree sequence

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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

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The Clustering Coefficient and the Diameter of Small-world Networks

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Acta Mathematica Sinica,English Series 2013年第1期29卷 199-208页

作者： Lei GU Hui Lin HUANG xiao dong zhang School of Mathematical Sciences Fudan University College of Mathematics and Information Science Wenzhou University Department of Mathematics and MOE-LSC Shanghai Jiao Tong University

The small-world network, proposed by Watts and Strogatz, has been extensively studied for the past over ten years. In this paper, a generalized smMl-world network is proposed, which extends severM small-world network models. Furthermore, some properties of a special type of generalized small-world network with given expectation of edge numbers have been investigated, such as the degree distribution and the isoperimetric number. These results are used to present a lower and an upper bounds for the clustering coefficient and the diameter of the given edge number expectation generalized small-world network, respectively. In other words, we prove mathematically that the given edge number expectation generalized small-world network possesses large clustering coefficient and small diameter.

关键词： Generalized small-world network clustering coefficient diameter Laplacian spectra

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Neuron devices:emerging prospects in neural interfaces and recognition

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Microsystems & Nanoengineering 2022年第6期8卷 1-13页

作者： Yang Wang Shuangjie Liu Hao Wang Yue Zhao xiao-dong zhang Tianjin Key Laboratory of Brain Science and Neural Engineering Academy of Medical Engineering and Translational MedicineTianjin University300072 TianjinChina Tianjin Key Laboratory of Low Dimensional Materials Physics and Preparing Technology Institute of Advanced Materials PhysicsSchool of SciencesTianjin University300350 TianjinChina

Neuron interface devices can be used to explore the relationships between neuron firing and synaptic transmission,as well as to diagnose and treat neurological disorders,such as epilepsy and Alzheimer’s *** is crucial to exploit neuron devices with high sensitivity,high biocompatibility,multifunctional integration and high-speed data *** the past decades,researchers have made significant progress in neural electrodes,artificial sensory neuron devices,and neuromorphic optic neuron *** main part of the review is divided into two sections,providing an overview of recently developed neuron interface devices for recording electrophysiological signals,as well as applications in neuromodulation,simulating the human sensory system,and achieving memory and *** mainly discussed the development,characteristics,functional mechanisms,and applications of neuron devices and elucidated several key points for clinical *** present review highlights the advances in neuron devices on brain-computer interfaces and neuroscience research.

关键词： Neuron epilepsy neural

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