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Subcategories of Fixed Points of Mutations by Exceptional Objects in Triangulated Categories

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Acta Mathematica Sinica,English Series 2016年第2期32卷 187-198页

作者： li Dan tang College of Mathematics and Computer Science Fuzhou University

We first prove that the subcategory of fixed points of mutation determined by an excep- tional object E in a triangulated category coincide with the perpendicular category of E. Based on this characterisation, we prove that the subcategory of fixed points of mutation in the derived category of the coherent sheaves on weighted projective line with genus one is equivalent to the derived category of a hereditary algebra. Meanwhile, we induce two new recollements by left and right mutations from a given recollement.

关键词： Subcategory of fixed points exceptional object recollement

Stable P-Harmonic Maps Between Finsler Manifolds

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Acta Mathematica Sinica,English Series 2010年第5期26卷 885-900页

作者： Jin tang li Department of Mathematics Xiamen University Xiamen 361005 P. R. China

In this paper, we derive the first and second variation formulas for JC-harmonic maps between Finsler manifolds, and when F″≤ 0 and n ≥ 3, we prove that there is no nondegenerate stable F-harmonic map between a Rie... 详细信息

关键词： F-harmonic maps Finsler manifolds stability

Investigation on UV-curing Reprocessable Thermosets Bearing Hindered Urea Bonds and Their Composites with Modified Zinc Oxide Nanoparticles

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Chinese Journal of Polymer Science 2024年第6期42卷 751-765页

作者： Jun-Hao Zhou li-Ming tang Key Laboratory of Advanced Materials of Ministry of Education of China Department of Chemical EngineeringTsinghua UniversityBeijing100084China

In this study,a series of hindered urea bond(HUB)containing polyurethane-urea methacrylate prepolymers and a none HUB containing polyurethane methacrylate prepolymer were prepared using isobornyl methacrylate as the reactive diluent via one-pot *** prepolymers were characterized fully by various ***,their thermosets were fabricated via UV curing in presence of a photo initiator,and their mechanical property and thermal behavior were investigated and *** from the none HUB containing thermoset,the HUB containing thermosets(defined as PUT)could be recycled and reprocessed by hot press under relatively mild conditions with high recovery ratio of mechanical ***,zinc oxide(ZnO)nanoparticles were modified with 3-(trimethoxysilyl)propyl methacrylate and the modified ZnO(defined as ZnO-TPM)was dispersed and polymerized into PUT matrix to prepare their *** influence of ZnO-TPM on the mechanical performance of the composites was evaluated,which indicated that the Young’s modulus and tensile strength increased gradually to the maximum values at ZnO-TPM content of 1 wt%and then *** composites also displayed good reprocessability with improved recovery ratio compared to the pure PUT *** addition,the composite materials exhibited strong UV absorption capacity,implying their potential application in the circumstance where UV-shielding was required.

关键词： Polyurethane-urea methacrylate Hindered urea bond ZnO nanoparticles Reprocessing UV curing

Nonlinear evolution of turbulent spots in the near-wall shear flow

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Science China(Physics,Mechanics & Astronomy) 2006年第2期49卷 158-168页

作者： ZHANG li tang Dengbin Department of aerodynamics Nanjing University of Aeronautics and Astronautics Nanjing 210016 China Department of aerodynamics Nanjing University of Aeronautics and Astronautics Nanjing 210016 China

The initial model of turbulent spots with the wall disturbance using the pulse form was proposed. A group of three-dimensional coupling compact difference schemes with high accuracy and high resolution were developed, and implemented to simulate the formation and development of turbulent spots in the near-wall shear flow by means of direct numerical simulation of the Navier-Stokes equations. Growing and decaying modes were used to analyze nonlinear evolution characteristics of the turbulent spots.

关键词： turbulent spots direct numerical simulation initial model nonlinear evolution.

Fracture spacing behavior in layered rocks subjected to different driving forces： a numerical study based on fracture infilling process

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Frontiers of Earth Science 2014年第4期8卷 472-489页

作者： lianchong li Shaohua li Chun'an tang School of Civil Engineering Dalian University of Technology Dalian 116024 China

Natural layered rocks subjected to layerparallel extension typically develop an array of opening- mode fractures with a remarkably regular spacing. This spacing often scales with layer thickness, and it decreases as extension increases until fracture saturation is reached. To increase the understanding of how these opening-mode fractures form in layered rocks, a series of 2D numerical simulations are performed to investigate the infilling process of fractures subjected to different driving forces. Numerical results illustrate that any one of the following could be considered as a driving force behind the propagation of infilling fractures： thermal effect, internal fluid pressure, direct extension loading, or pure compressive loading. Fracture spacing initially decreases with loading process, and at a certain ratio of fracture spacing to layer thickness, no new fractures nucleate （saturated）. Both an increase in the opening of the infilled fractures and interface delamination are observed as mechanisms that accommodate additional strain. Interface debonding stops the transition of stress from the neighboring layers to the embedded central layer, which may preclude further infilling of new fractures. Whatever the driving force is, a large overburden stress and a large elastic contrast between the stiff and soft layers （referred to as a central or fractured layer and the top and bottom layers） are key factors favoring the development of tensile stress around the infilled fractures in the models. Fracture spacing is expected to decrease with increasing overburden stress. Numerical results highlight the fracturing process developed in heterogeneous and layered sedimentary rocks which provides supplementary information on the stress distribution and failure-induced stress redistribution., It also shows, in detail, the propagation of the fracture zone and the interaction of the fractures, which are impossible to observe in field and are difficult to consider with static st

关键词： opening-mode fractures fracture spacing,driving force numerical simulation heterogeneity

Multilayer ANN indoor location system with area division in WLAN environment

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Journal of Systems Engineering and Electronics 2010年第5期21卷 914-926页

作者： Mu Zhou Yubin Xu li tang School of Electronics and Information Engineering Harbin Institute of Technology Harbin 150001 P. R. China

An indoor location system based on multilayer artificial neural network（ANN） with area division is *** characteristics of recorded signal strength（RSS）,or signal to noise ratio（SNR） from each available access points（APs）,are utilized to establish the radio map in the off-line *** in the on-line phase,the two or three dimensional coordinates of mobile terminals（MTs） are estimated according to the similarity between the new recorded RSS or SNR and fingerprints pre-stored in radio *** the feed-forward ANN with three layers is sufficient to describe any nonlinear mapping relationship between inputs and outputs with finite discontinuous points,the efficient inputs for better training performances are difficult to be determined because of complex and dynamic indoor ***,the discussion of distance relativity for different signal characteristics and optimal strategies for multi-mode phenomenon avoidance is *** also,the feasibility and effectiveness of this method are verified based on the experimental comparison with normal ANN without area division,K-nearest neighbor（KNN） and probability methods in typical office environment.

关键词： indoor location artificial neural network multilayer structure multi-mode relativity.

Engineering cancer vaccines using stimuli-responsive biomaterials

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Nano Research 2018年第10期11卷 5355-5371页

作者： Yu Zhao Yugang Guo li tang Institute of Bioengineering Ecole polytechnique federale de Lausanne (EPFL) Lausanne CH-1015 Switzerland Institute of Materials Science & Engineering Ecole polytechnique federale de Lausanne (EPFL) Lausanne CH- 1015 Switzerland

Cancer vaccines aimed at expanding the pool or increasing the activity of tumor-specific T cells against malignancies is an important immunotherapy modality that has been extensively pursued in the past decades. However, the clinical efficacy of cancer vaccines remains modest in comparison to other immunotherapies, such as checkpoint blockade and adoptive T cell therapy. This unsatisfactory performance is likely due to the suboptimal selection of tumor antigens for vaccine and inefficient delivery platform. Recently, vaccines designed to target cancer neoantigens have shown marked promise in both preclinical and early clinical studies. However, enormous challenges need to be overcome to develop a highly efficient and safe delivery strategy for targeting cancer vaccines to professional antigen-presenting cells and eliciting optimized immune response against cancers. To meet these challenges, biomaterials, particularly biomaterials that are designed to respond to certain environmental stimuli, termed as stimuli-responsive biomaterials, are being actively developed to precisely manipulate the trafficking and release of cancer vaccines in vivo for enhanced therapeutic efficacy and safety. In this mini review, we provide a brief overview of the recent advances in applying stimuli-responsive biomaterials in enhancing non-cellular cancer vaccines while focusing on the chemistry and material design with varied responsiveness. We also discuss the present challenges and opportunities in the field and provide a perspective for future directions.

关键词： cancer vaccine stimuli-responsive biomaterial nanoparticle immune response lymph node targeting cross-presentation

SOME ESTIMATIONS FOR DETERMINANT OF THE HADAMARD PRODUCT OF H-MATRICES

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Journal of Computational Mathematics 2005年第4期23卷 401-407页

作者： Yao-tang li Cong-lei Zhong Department of Mathematics Yunnan University Kunming 650091 China College of Science Henan University of Science and Technology Luoyang 417003 China

In this paper, some new results on the estimations of bounds for determinant of Hadamard Product of two H-matrices are given. Several recent results are improved and generalized.

关键词： H-matrix Hadamard Product Determinant

Microglial Calcium Homeostasis Modulator 2:Novel Anti-neuroinflammation Target for the Treatment of Neurodegenerative Diseases

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Neuroscience Bulletin 2024年第4期40卷 553-556页

作者： Yuan Dong li tang Neuropsychiatry Research Institute The Affiliated Hospital of Qingdao UniversityQingdao UniversityQingdao266000China Qingdao Institute of Measurement Technology Qingdao266000China

Neurodegenerative diseases,including Alzheimer's disease(AD)and Parkinson's disease(PD),are the most common causes of *** drugs for such diseases can only provide temporary help with the symptoms,leaving the discovery of new drugs urgently in *** cells are the local immune cells in the nervous system and have been recognized as the key player in neuroinflammation that contributes to the process of neurodegeneration[1],raising the discussion of aiming microglia as the therapeutic target for clinical treatment of neurodegenerative diseases.

关键词： inflammation degenerative drugs