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BIFURCATIONS OF SUBHARMONIC SOLUTIONS IN PERIODIC PERTURBATION OF A HYPERBOLIC LIMIT CYCLE

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Applied Mathematics and Mechanics(English Edition) 2002年第8期23卷 981-986页

作者： HAN mao-an(韩茂安) GU sheng-shi(顾圣士) Department of Mathematics Shanghai Jiaotong University Shanghai 200030 P R China Department of Mathematics Shanghai Jiaotong University Shanghai 200030 P R China

Bifurcations of subharmonic solutions of order m of a planar periodic perturbed system near a hyperbolic limit cycle are discussed. By using a Poincare map and the method of rescaling a discriminating condition for th... 详细信息

关键词： bifurcation subharmonic solution limit cycle

Design and development of a mitochondrial-targeted photosensitizer for two-photon fluorescence imaging and photodynamic therapy

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Journal of Materials Science & Technology 2023年第10期141卷 135-148页

作者： Yu Chen sheng Zhang Tianjiao Cheng Wei Lin Linlin mao Zhonghui Chen yang yang Hanqing Huang Jinqiu Li Zhiyong Ke Zhong-Kai Cui Institute of Cancer Affiliated Hospital of Putian UniversityPutian UniversityPutian 351100China Department of Cell Biology School of Basic Medical SciencesSouthern Medical UniversityGuangzhou 510515China Affiliated Putian Hospital of Southern Medical University Putian 351100China Guangdong Engineering Research Center for Translation of Medical 3D Printing Application Guangzhou 510515China

Mitochondria are well-acknowledged as ideal targets for tumor therapy due to their important role in energy supply and cellular signal ***-specific photosensitizers have been reported to be critical for inducing cell ***-photon fluorescence imaging provides a new technique for delineating biological structures and activities in deep ***,we developed a new aggregation-induced emission(AIE)active photosensitizer by attaching a pyridinium group for mitochondrial *** rationally designed photosensitizer(TTTP)exhibited excellent photophysical properties,good biocompatibility,reactive oxygen species(ROS)stimulation ability,anticancer efficacy,and two-photon imaging *** was highly taken up by cells and accumulated specifically in mitochondria but was selectively cytotoxic to cancer *** light irradiation,the generation of ROS was significantly boosted,leading to actively induced *** in vivo tumor photodynamic therapeutic efficacy of TTTP showed significant inhibition of tumor ***,the underlying mechanism of TTTP tu-mor suppression revealed that the apoptosis agonist Bax was markedly up-regulated while the antagonist Bcl-xL was *** research provides a potential mitochondrial-targeted phototherapeutic agent for effective therapy and two-photon fluorescence imaging.

关键词： Mitochondrial-targeting Two-photon fluorescence imaging Photodynamic therapy Apoptosis Reactive oxygen species(ROS)

Influences of shale microstructure on mechanical properties and bedding fractures distribution

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Petroleum Science 2024年第3期21卷 1944-1954页

作者： Ming-Zhe Gu mao sheng Shi-Zhong Cheng Fan-Hao Gong Gen-sheng Li State Key Laboratory of Petroleum Resources and Engineering China University of Petroleum-BeijingBeijing2249China College of Petroleum Engineering China University of Petroleum-BeijingBeijing102249China Shenyang Center of China Geological Survey ShenyangLiaoning110034China

The difference in microstructure leads to the diversity of shale mechanical properties and bedding fractures distribution *** this paper,the microstructure and mechanical properties of Longmaxi marine shale and Qingshankou continental shale were studied by X-ray diffractometer(XRD),field emission scanning electron microscope(FE-SEM)with mineral analysis system,and ***,the typical bedding layers area was properly stratified using Focused Ion Beam(FIB),and the effects of microstructure and mechanical properties on the distribution patterns of bedding fractures were *** results show that the Longmaxi marine shale sample contains more clay mineral grains,while the Qingshankou continental shale sample contains more hard brittle mineral grains such as *** Longmaxi marine shale sample,hard brittle minerals with grain sizes larger than 20μm is18.24%and those with grain sizes smaller than 20μm is 16.22%.For Qingshankou continental shale sample,hard brittle minerals with grain sizes larger than 20μm is 40.7%and those with grain sizes smaller than 20μm is 11.82%.In comparison to the Qingshankou continental shale sample,the Longmaxi marine shale sample has a lower modulus,hardness,and *** shales are formed by alternating coarse-grained and fine-grained layers during *** average single-layer thickness of Longmaxi marine shale sample is greater than Qingshankou continental shale *** two types of shale have similar bedding fractures distribution patterns and fractures tend to occur in the transition zone from coarse-grained to fine-grained *** orientation of the fracture is usually parallel to the bedding plane and detour occurs in the presence of hard brittle *** fracture distribution density of the Longmaxi marine shale sample is lower than that of the Qingshankou continental shale sample due to the strong heterogeneity of the Qingshankou continental *** current resea

关键词： Shale Nanoindentation Microstructure Mechanical property Fracture

A multifunctional stealthy material for wireless sensing and active camouflage driven by configurable polarization

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Journal of Materials Science & Technology 2023年第1期132卷 42-49页

作者： Min Zhang mao-sheng Cao Qiang-Qiang Wang Xi-Xi Wang Wen-Qiang Cao Hui-Jing yang Jie Yuan School of Materials Science and Engineering Beijing Institute of TechnologyBeijing 100081China Department of Physics Beijing Technology and Business UniversityBeijing 100048China School of Electrical and Electronic Engineering Nanyang Technological University639798Singapore Department of Physics Tangshan Normal UniversityTangshan 063000China School of Information Engineering Minzu University of ChinaBeijing 100081China

The dipole species transformation and polarization relaxation configuration are achieved by changing the cobalt ion stoichiometry,which precisely tailors the electromagnetic attenuation performance of bismuth iron cobalt *** the stoichiometric ratio of Fe:Co is 19:1,the optimal reflection loss reaches-60 *** high electromagnetic attenuation performance significantly improve the linear sensitivity of the strain response and active customized stealth capability of the designed multifunctional capacitor-like ***,the wireless multifunctional design integrates energy attenuaten of electromagnetic wave with the wireless sensing and active camouflage functions for the first *** work provides an important step for the realization of electromagnetical multifunctional applications including electromag-netic protection and electromagnetic sensing in artificial beings,medical health and even space travel.

关键词： Electromagnetic absorption Polarization relaxation Electromagnetic sensing Active camouflage

The influences of perforating phase and bedding planes on the fracture deflection in laminated shale

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Petroleum Science 2024年第2期21卷 1221-1230页

作者： Ming-Zhe Gu mao sheng Xiao-Ying Zhuang Xin-Yi Li Gen-sheng Li National Key Laboratory of Petroleum Resources and Engineering China University of PetroleumBeijing102249China College of Petroleum Engineering China University of PetroleumBeijing102249China College of Civil Engineering Tongji UniversityShanghai200092China

The perforating phase leads to complex and diverse hydraulic fracture propagation behaviors in laminated shale formations. In this paper, a 2D high-speed imaging scheme which can capture the interaction between perforating phase and natural shale bedding planes was proposed. The phase field method was used to simulate the same conditions as in the experiment for verification and hydraulic fracture propagation mechanism under the competition of perforating phase and bedding planes was *** results indicate that the bedding planes appear to be no influence on fracture propagation while the perforating phase is perpendicular to the bedding planes, and the fracture propagates along the perforating phase without deflection. When the perforating phase algins with the bedding planes, the fracture initiation pressure reserves the lowest value, and no deflection occurs during fracture propagation. When the perforating phase is the angle 45°, 60°and 75°of bedding planes, the bedding planes begin to play a key role on the fracture deflection. The maximum deflection degree is reached at the perforating phase of75°. Numerical simulation provides evidence that the existence of shale bedding planes is not exactly equivalent to anisotropy for fracture propagation and the difference of mechanical properties between different shale layers is the fundamental reason for fracture deflection. The findings help to understand the intrinsic characteristics of shale and provide a theoretical basis for the optimization design of field perforation parameters.

关键词： Shale Propagation Perforating Bedding Structure

Developing MXenes from Wireless Communication to Electromagnetic Attenuation

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Nano-Micro Letters 2021年第7期13卷 188-221页

作者： Peng He mao-sheng Cao Wen-Qiang Cao Jie Yuan School of Materials Science and Engineering Beijing Institute of TechnologyBeijing 100081People’s Republic of China School of Information Engineering Minzu University of ChinaBeijing 100081People’s Republic of China

There is an urgent global need for wireless communication utilizing materials that can provide simultaneous flexibility and high *** the harmful effects of electromagnetic(EM)radiation from wireless communication is a persistent research hot ***-dimensional(2D)materials are the preferred choice as wireless communication and EM attenuation materials as they are lightweight with high aspect ratios and possess distinguished electronic ***,as a novel family of 2D materials,have shown excellent properties in various fields,owing to their excellent electrical conductivity,mechanical stability,high flexibility,and ease of *** date,research on the utility of MXenes for wireless communication has been actively ***,MXenes have become the leading materials for EM ***,we systematically review the recent advances in MXene-based materials with different structural designs for wireless communication,electromagnetic interference(EMI)shielding,and EM wave *** relationship governing the structural design and the effectiveness for wireless communication,EMI shielding,and EM wave absorption is clearly ***,our review mainly focuses on future challenges and guidelines for designing MXene-based materials for industrial application and foundational research.

关键词： MXene Wireless communication Electromagnetic wave absorption Electromagnetic interference shielding

Inhibitory effect of tartary buckwheat seedling extracts and associated flavonoid compounds on the polyphenol oxidase activity in potatoes(Solanum tuberosum L.)

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Journal of Integrative Agriculture 2019年第9期18卷 2173-2182页

作者： LI Jun WANG Hui LU yang mao Tang-fen XIONG Jiang HE sheng-ling LIU Hui Guizhou Biotechnology Institute Guizhou Academy of Agricultural SciencesGuiyang 550006P.R.China Food Processing Institute Guizhou Academy of Agricultural Sciences/Potato Engineering Research Center of Guizhou ProvinceGuiyang 550006P.R.China

To improve the processing quality of potatoes,phosphate buffer extract(PBE),50%ethanol(E50),and aqueous extract(AE)of tartary buckwheat seedlings were evaluated for their ability to inhibit the enzymatic browning of *** results suggest that all extracts of tartary buckwheat seedlings exert significant inhibitory effects on the polyphenol oxidase(PPO)activity in *** relative concentrations required for a 50%reduction in the PPO activity(IC50)were 0.21,0.28 and 0.41 mg mL^-1,for PBE,E50 and AE,*** strongest inhibitory activity was observed for PBE,followed by E50 and *** flavone compounds in the PBE of tartary buckwheat seedlings(i.e.,rutin,kaempferol-3-O-rutinoside,quercetin,and kaempferol)were identified by high-performance liquid *** compounds were subsequently evaluated for their roles in the inhibition of PPO from potatoes using a model *** results indicated that rutin exhibited the highest inhibition rate on the PPO of potato.A synergistic inhibitory effect was observed by mixing rutin,kaempferol-3-Orutinoside,quercetin,and *** inhibitory patterns of rutin,kaempferol-3-O-rutinoside,and quercetin on the enzyme were noncompetitive and reversible,with inhibitory constants of 0.12,0.31,and 0.40 mg mL^-1,*** from tartary buckwheat seedlings may exhibit a common mechanism with phenolic compounds,involving the blockage of the reaction of oxygen with PPO leading to the inhibition of the enzymes involved in *** on these results,extracts of tartary buckwheat seedlings can be used as potent natural inhibitors.

关键词： tartary buckwheat natural inhibitor flavonoid compounds polyphenol oxidase potato

A Method for Measuring the Structure Complexity of Web Application

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Wuhan University Journal of Natural Sciences 2006年第1期11卷 143-150页

作者： mao Cheng-ying LU Yan-sheng College of Computer Science and Technology Huazhong University of Science and Technology Wuhan 430074Hubei China

The precise and effective measure results of Web applications not only facilitate good comprehension of them, but also benefit to the macro-management of software activities, such as testing, reverse engineering, reuse, etc. The paper exploits some researches on measuring the structure complexity of Web application. Through a deep analysis of the configuration and objects＇ interactions of Web system, two conclusions have been drawn：① A generic Web application consists of static web page, dynamic page, component and database object; ② The main interactions have only three styles, that is static link, dynamic link and call/return relation. Based on analysis and modeling of the content of a Web page （static or dynamic）, complexity measure methods of both control logic of script and nesting of HTML code are further discussed. In addition, two methods for measuring the complexity of inte〉page navigation are also addressed by modeling the inte〉page navigation behaviors of Web application via WNG graph.

关键词： structure complexity measure DD graph,HTree tree WNG graph

Road-safety recognition and network equilibrium with perceived route-choice sets

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Transportation Safety and Environment 2019年第2期1卷 126-134页

作者： mao-sheng Li He-lai Huang School of Traffic and Transportation Engineering Central South UniversityNo.68 South Shaoshan RoadChangsha City 410075HunanChina

Safety is regarded as the second basic need in Maslow’s hierarchy of needs(1943),and safety recognition and circumvention behaviour in the route-choice decision-making process should therefore be accommodated in network-traffic equilibrium analysis *** paper proposes a framework by which crash frequency,forecasted using the safety-analysis method or compiled from historical data for intersections,is used to measure the safety consciousness of *** are then classified into different groups according to their acceptable-risk thresholds,and each group has its own route-choice *** behaviour whereby drivers are willing to bear additional costs in order to circumvent travel risk is incorporated into the variational inequality model based on the user equilibrium in the perceived route-choice set(UE-PRCS),which is an extension of Wardrop’s first *** Frank–Wolfe algorithm,based on the convex combination method,is employed to obtain the solution.A small road network is used as a case study to illustrate the proposed framework,incorporating risk recognition and circumvention behaviour under different combinations of traffic demand and risk-sensitivity group *** results show that the standard user equilibrium is a special case of the UE-PRCS,but that the UE traffic state is more common than the UE-PRCS under different parameters.

关键词： safety recognition risk circumvention network-equilibrium analysis perceived route-choice set