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Chamber Structure for Some Equivariant Relative Gromov–Witten Invariants of P^1 in Genus 0

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Acta Mathematica Sinica,English Series 2018年第9期34卷 1345-1370页

作者： Long ting wu Beijing International Center for Mathematical Research Peking University

In this paper, we study genus 0 equivariant relative Gromov Witten invariants of P1 whose corresponding relative stable maps are totally ramified over one point. For fixed number of marked points, we show that such invariants are piecewise polynomials in some parameter space. The parameter space can then be divided into polynomial domains, called chambers. We determine the difference of polynomials between two neighbouring chambers. In some special chamber, which we called the totally negative chamber, we show that such a polynomial can be expressed in a simple way. The chamber structure here shares some similarities to that of double Hurwitz numbers.

关键词： Chamber structure equivariant relative Gromov-Witten invariants relative virtual localization formula

Fruit Fly as a Model Organism for Blood-Brain Barrier Penetration and Infectious Disease in the Nanomedical Niche

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Journal of Bionic Engineering 2020年第3期17卷 553-569页

作者： Victoria Meng-ting wu Vuk Uskokovic MP Biomedicals 9 GoddardIrvineCA 92618USA Department of Mechanical and Aerospace Engineering University of CaliforniaEngineering Gateway 4200Irviney CA 92697USA

Drosophila melanogaster,*** common fhiit fly,is a simple organism that may give a rapid,high-throughput response in regard to the therapeutic efficacy of nanoparticles and drugs,while circumventing the high environmental and monetary cost of today's typical in vivo assays involving more complex animals,along with the immeasurable suffering imposed onto *** we give the progress report on our effort to turn *** into a model organism for the in vivo testing of Blood-Brain Barrier(BBB)penetration of nanoparticles and the treatment of infectious *** show that orally ingested superparamagnetic nanoparticles successfully cross the BBB in *** and localize to the optic lobes of the third instar larval brain,while causing no adverse effects to the invertebrate *** also show that both orally ingested calcium phosphate nanoparticles and biofilm-forming *** localize to the Drosophila crop,the food storage organ of the fly,which shrinks in response to *** model does not induce mortality consequential to infection and the effects of the internalization and proliferation of the microbes are evaluable by measuring the crop parameters,including fluorescence intensity and *** development of these two models could simplify the preclinical testing of medical treatments and of pharmaceutical agents for neurological and infectious disease,while ensuring robust and reliable levels of statistical significance at low cost.

关键词： animal model calcium phosphate in vivo iron oxide nanoparticle

Statistical Diagnosis for HIV Dynamics Based on Mean Shift Outlier Model

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Journal of Systems Science & Complexity 2015年第3期28卷 592-605页

作者： wu ting LIU Sanyang ZHOU Jie School of Mathematics and Statistics Xidian University

Ordinary differential equation(ODE) are widely used for quantifying HIV viral *** is interesting but challenging to estimate ODE parameters from noisy data, especially when the data have some outliers. In this study, the authors use the Mean Shift Outlier Model(MSOM) to detect outliers in HIV model based on the two-step estimation of ODE. Approximate formula for shift parameter is derived. Furthermore, a score test statistic is constructed and its approximating distribution is established. The simulation results show that: 1) The boundary points have more impact on the parameter estimation relative to interior points. 2) The proposed procedure can detect the outliers effectively. The authors illustrate the proposed approach using an application example from an HIV clinical trial and find similar pattern to the simulation studies.

关键词： HIV dynamics local polynomial smoothing mean shift outlier model nonparametric regression.

Influence of secondary phases of AlSi9Cu3 alloy on the plasma electrolytic oxidation coating formation process

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Journal of Materials Science & Technology 2020年第15期47卷 75-85页

作者： ting wu Carsten Blawert Mikhail LZheludkevich MagIC-Magnesium Innovation Centre Helmholtz-Zentrum Geesthacht21502 GeesthachtGermany Institute of Materials Science Faculty of EngineeringKiel UniversityKaiserstrasse 224143 KielGermany

To understand the formation and growth of plasma electrolytic oxidation(PEO) coatings in presence of different secondary phases in a substrate,PEO treatment was carried out on AlSi9 Cu3 alloy at different treatment times ranging from 15 s to 480 *** coating formation and evolution process was traced by surface and cross-sectional observation of the layers on the different phases of the *** results demonstrated a sequential involvement of the different phases in the plasma discharges:firstly,discharges start on the α-Al matrix,then on the intermetallic Al2 Cu and β-Al5 FeSi phases at the same time and finally on the eutectic *** presence of intermetallic Al2 Cu remarkably affects the initial dissolution,the deposition of conversion products and the ignition of discharges at the early stages of *** Si in the substrate exhibits the highest electrochemical stability at all stages and contributes in the beginning to a distinct coating morphology *** resultant PEO coating tends to be uniform if processing times are longer and a double-layer structure appears in the coating.

关键词： Plasma electrolytic oxidation Aluminum alloy Secondary phases

On Minimization of Upper Bound for the Convergence Rate of the QHSS Iteration Method

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Communications on Applied Mathematics and Computation 2019年第2期1卷 263-282页

作者： Wen-ting wu State Key Laboratory of Scientific/Engineering Computing Institute of Computational Mathematics and Scientific/Engineering ComputingAcademy of Mathematics and Systems ScienceChinese Academy of Sciences. P.O. Box 2719. Beijing 100190China School of Mathematical Sciences University of Chinese Academy of SciencesBeijing 100049China

For an upper bound of the spectral radius of the QHSS (quasi Hermitian and skew-Hermitian splitting) iteration matrix which can also bound the contraction factor of the QHSS iteration method,we give its minimum point under the conditions which guarantee that the upper bound is strictly less than one. This provides a good choice of the involved iteration parameters,so that the convergence rate of the QHSS iteration method can be significantly improved.

关键词： System of linear equations Non-Hermitian matrix QHSS iteration method Convergence rate

A magnetic nanoparticles-based method for DNA extraction from the saliva of stroke patients

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Neural Regeneration Research 2013年第32期8卷 3036-3046页

作者： Li Yi Ying Huang ting wu Jun wu Department of Neurology Peking University Shenzhen Hospital

C677T polymorphism in the methylenetetrahydrofolate reductase （MTHFR） gene is a risk factor for stroke, suggesting that widespread detection could help to prevent stroke. DNA from 70 stroke pa- tients and 70 healthy controls was extracted from saliva using a magnetic nanoparticles-based method and from blood using conventional methods. Real-time PCR results revealed that the C677T polymorphism was genotyped by PCR using DNA extracted from both saliva and blood samples. The genotype results were confirmed by gene sequencing, and results for saliva and blood samples were consistent. The mutation TT genotype frequency was significantly higher in the stroke group than in controls. Homocysteine levels were significantly higher than controls in both TT genotype groups. Therefore, this noninvasive magnetic nanoparticles-based method using saliva samples could be used to screen for the MTHFR C677T polymorphism in target populations.

关键词： neural regeneration brain injury stroke magnetic nanoparticles saliva methylenetetrahydrofolatereductase homocysteine gene polymorphism gene screening grants-supported paper neuroregeneration

On the Communication of Chinese Discourse Act from the Moral Perspective

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学术界 2015年第9期 308-312页

作者： wu ting School of Foreign Studies Southeast University Nanjing Jiangsu 210096

Chinese discourse and Chinese dissemination are two main propositions of discourse *** is the tool for dissemination and the essence of ***,Taoism and Mohism show the typical morality of the dissemination of the Chinese *** morality implies the competition of the civilization model among different people,nations and *** civilization embodies the competition of national interests and *** rapid development of new media brings China the new opportunity to break the monopoly of the Western countries and strive for international discourse ***,it expands the competition between the Eastern and the Western *** the Chinese discourse system and improving the influence of its dissemination shall be based on the morality of the dissemination of the discourse act.

关键词：话语权传播道德中国行为西方意识形态国家利益西方国家

Structural optimization strategy of pipe isolation tool by dynamic plugging process analysis

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Petroleum Science 2021年第6期18卷 1829-1839页

作者： ting-ting wu Hong Zhao Bo-Xuan Gao Fan-Bo Meng College of Mechanical and Transportation Engineering China University of PetroleumBeijing102249China

During the pipeline plugging process,both the pipeline and the pipe isolation tool(PIT)will be greatly damaged,due to the violent vibration of the flow *** this study,it was proposed for the first time to reduce the vibration of the flow field during the plugging process by optimizing the surface structure of the ***,the central composite design(CCD)was used to obtain the optimization schemes,and the drag coefficient and pressure coefficient were proposed to evaluate the degree of flow field ***,a series of computational fluid dynamics(CFD)simulations were performed to obtain the drag coefficient and pressure coefficient during dynamic *** the mathematical model of drag coefficient and pressure coefficient with the surface structure of the PIT were established ***,a modified particle swarm optimization(PSO)was applied to predict the optimal value of the surface structure of the ***,an experimental rig was built to verify the effectiveness of the *** results showed that the improved method could reduce the flow field vibration by 49.56%.This study provides a reference for the design of the PIT surface structure for flow field vibration technology.

关键词： Pipe isolation tool Dynamic analysis Drag coefficient Pressure coefficient Modified particle swarm optimization algorithm

Intelligent identification of landslides in loess areas based on the improved YOLO algorithm:a case study of loess landslides in Baoji City

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Journal of Mountain Science 2023年第11期20卷 3343-3359页

作者： LIU Qing wu ting-ting DENG Ya-hong LIU Zhi-heng School of Mechanical and Electrical Engineering Huainan Normal UniversityHuainan 232038China School of Geomatics Anhui University of Science and TechnologyHuainan 232001China School of Geology Engineering and Geomatics Chang’an UniversityXi’an 710064China School of Aerospace Science and Technology Xidian UniversityXi'an 710064China

Loess landslides are one of the geological hazards prevalent in mountainous areas of Loess Plateau,seriously threatening people's lives and property *** identification of landslides is a prerequisite for reducing the risk of landslide *** landslide interpretation methods often have the disadvantage of being laborious and difficult to use on a large scale compared with the recently developed deep learning-based landslide detection *** this study,we propose an improved deep learning model,landslide detectionyou only look once(LD-YOLO),based on the existing you only look once(YOLO)model for the intelligent identification of old and new landslides in loess ***,remote sensing images of landslides in Baoji City,Shaanxi Province,China are acquired from the Google Earth Engine *** landslide images of Baoji City(excluding Qianyang County)are used to establish a loess landslide dataset for training the *** landslide data of Qianyang County is used to verify the detection performance of the *** focal and efficient IoU(Focal-EIoU)loss function and efficient channel attention(ECA)mechanism are incorporated into the 7th version of YOLO(YOLOv7)model to construct the LD-YOLO model,which makes it more suitable for the landslide detection *** experiments yielded an improved LD-YOLO model with average precision of 92.05%,precision of 92.31%,recall of 90.28%,and F1-score of 91.28%for loess landslide *** landslides in Qianyang County were divided into two test sets,new landslides and old landslides,which were used to test the detection performance of LD-YOLO for both types of *** results show that LD-YOLO detects old landslides with a detection precision of 82.75%and a recall of 80%.When detecting new landslides,the detection precision is 94.29%and the recall is 91.67%.It indicates that our proposed LD-YOLO model has strong detection performance for both new and old landslides in loess areas

关键词： Loess landslide Deep learning Attention mechanism Data augmentation You only look once(YOLO)