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Bifurcations of Resonant Solutions and Chaos in Physical Pendulum Equation with Suspension Axis Vibrations

Acta Mathematicae Applicatae Sinica 2010年第4期26卷 677-704页

作者： xiang-ling Fu Jin Deng Jian-ping Yang School of Mathematics Hunan University of Science and TechnologyHunan 411201China College of Mathematics and Computer Sciences Hunan Normal UniversityHunan 410081China Department of Mathematics and Physics Hunan Institute of EngineeringHunan 411104China College of Science China Agricultural UniversityBeijing 100083China

This paper is a continuation of ＂Complex Dynamics in Physical Pendulum Equation with Suspension Axis Vibrations＂[1].In this paper,we investigate the existence and the bifurcations of resonant solution for ω0：ω：Ω ≈ 1：1：n,1：2：n,1：3：n,2：1：n and 3：1：n by using second-order averaging method,give a criterion for the existence of resonant solution for ω0：ω：Ω ≈ 1：m：n by using Melnikov＇s method and verify the theoretical analysis by numerical *** numerical simulation,we expose some other interesting dynamical behaviors including the entire invariant torus region,the cascade of invariant torus behaviors,the entire chaos region without periodic windows,chaotic region with complex periodic windows,the entire period-one orbits region;the jumping behaviors including invariant torus behaviors converting to period-one orbits,from chaos to invariant torus behaviors or from invariant torus behaviors to chaos,from period-one to chaos,from invariant torus behaviors to another invariant torus behaviors;the interior crisis;and the different nice invariant torus attractors and chaotic *** numerical results show the difference of dynamical behaviors for the physical pendulum equation with suspension axis vibrations between the cases under the three frequencies resonant condition and under the periodic/quasi-periodic *** exhibits many invariant torus behaviors under the resonant *** find a lot of chaotic behaviors which are different from those under the periodic/quasi-periodic ***,we did not find the cascades of period-doubling bifurcation.

关键词： Pendulum equation suspension axis vibrations averaging method Melnikov's method bifurcations chaos three frequencies resonances resonant solution

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Reaction of Crossed Diperoxidation Between Cyclic Ketones and Alkyl Ketones

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Chemical Research in Chinese Universities 2002年第4期18卷 412-413页

作者： XU wei-liang FU Cheng-ling Organic Chemistry Group Huajiachi SectionZhejiang UniversityHangzhou 310029P.R.China

The reaction of crossed diperoxidation between the cyclic ketones and the alkyl ketones was investigated. The reaction is a competing in different ketones. It is slightly favorable to resulting in crossed ketone diper... 详细信息

关键词： Synthesis Crossed diperoxidation Crossed ketone diperoxide

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A 31-year Global Diurnal Sea Surface Temperature Dataset Created by an Ocean Mixed-Layer Model

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Advances in Atmospheric Sciences 2018年第12期35卷 1443-1454页

作者： xiang LI Tiejun ling Yunfei ZHANG Qian ZHOU Key Laboratory of Research on Marine Hazards Forecasting National Marine Environmental Forecasting CenterState Oceanic Administration

A dataset of hourly sea surface temperature(SST) from the period 1 January 1982 to 31 December 2012, and covering the global ocean at a resolution of 0.3°× 0.3°, was created using a validated ocean mixed-layer model(MLSST). The model inputs were heat flux and surface wind speed obtained from the Coupled Forecast System Reanalysis dataset. Comparisons with in-situ data from the Tropical Atmosphere Ocean array and the National Data Buoy Center showed that the MLSST fitted very well with observations, with a mean bias of 0.07℃, and a root-mean-square error(RMSE) and correlation coefficient of 0.37℃ and 0.98, respectively. Also, the MLSST fields successfully reproduced the diurnal cycle of SST in the in-situ data, with a mean bias of -0.005℃ and RMSE of 0.26℃. The 31-year climatology revealed that the diurnal range was small across most regions, with higher values in the eastern and western equatorial Pacific, northern Indian Ocean, western Central America, northwestern Australia, and several coastal regions. Significant seasonal variation of diurnal SST existed in all basins. In the Atlantic and Pacific basins, this seasonal pattern was oriented north–south, following the variation in solar insolation, whereas in the Indian basin it was dominated by monsoonal variability. At the interannual scale, the results highlighted the relationship between diurnal and interannual variations of SST, and revealed that the diurnal warming in the central equatorial Pacific could be a potential climatic indicator for ENSO prediction.

关键词： SST diurnal cycle mixed-layer model climatic variation

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A pooling strategy of a PCR-based assay to detectAngiostrongylus cantonensis in snail intermediate host,Pomacea canaliculata

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Frontiers of Medicine 2010年第2期4卷 204-207页

作者： Fu-Rong wei Shan LV He-xiang LIU ling HU Yi ZHANG Department of Vector Control National Institute of Parasitic DiseaseChinese Center for Disease Control and PreventionKey Laboratory of Parasite and Vector Biology of the Ministry of HealthShanghai 200025China

Poolingﬁeld specimens could reduce the number of assay and thus increase the efﬁciency in detecting and screening pathogen infections by polymerase chain reaction(PCR)-based *** investigated a pooling strategy in diagnosis of Angiostrongylus canto-nensis in Pomacea *** settings of speci-mens were prepared,divided into portions and detected by multiplex *** A was 0.4490 g positive lung tissue of 28 larval nodes from four snails mixed with 1.310 g negative lung tissue from six snails and divided into 32 *** B was 0.5448 g positive lung tissue with 26 larval nodes from two snails mixed with 1.092 g negative lung tissue from seven snails and divided into 48 *** sampling was performed and sample size-accumulated positive rate curves were *** to the sample size-accumulated positive rate curves,the appropriate sample size of the two specimens were 18 and 15,respectively,which is 0.36–0.58 to the total sample *** test characteristics and the relevant factors to the sample size would need to be determined in much larger studies and more appropriately inﬁeld *** result indicates that the number of larval node is not the most important,nor the only factor to the sample *** also implies the feasibility to detect *** in *** by pooling strategies.

关键词： Angiostrongylus cantonensis Pomacea cana-liculata multiplex polymerase chain reaction diagnosis pooling

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Superior Toughened Biodegradable Poly(L-lactic acid)-based Blends with Enhanced Melt Strength and Excellent Low-temperature Toughness via In situ Reaction Compatibilization

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Chinese Journal of Polymer Science 2023年第3期41卷 373-385,I0007页

作者： Shi-ling Jia xiang-Yu Wang Ye Zhang xiang-Yu Yan Hong-wei Pan Yan Zhao Li-Jing Han Hui-Liang Zhang Li-Song Dong Hui-Xuan Zhang Key Laboratory of Polymer Ecomaterials Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China School of Materials Science and Engineering Changchun University of TechnologyChangchun 130012China

The toughened poly(L-lactic acid)/poly(butylene succinate-butylene terephthalate)(PLLA/PBST) blend with enhanced melt strength and excellent low temperature toughness and strength was prepared by melt compounding through in situ compatibilization reaction in presence of multifunctional epoxy compound(ADR).The PLLA/PBST blend was an immiscible system,and the compatibility of the PLLA/PBST blend was improved after adding *** and GPC curves confirmed the formation of the PLLA-g-PBST copolymer,which improved the interfacial bonding of the blend and therefore the PLLA/PBST/ADR blend showed excellent melt strength and mechanical *** the PLLA/PBST/ADR blend with 70/30 PLLA/PBST content,the complex viscosity increased significantly with increasing ADR ***,the tensile strength,elongation at break and impact strength all increased obviously with increasing the ADR *** elongation at break of the blend reached the maximum value of 392.7%,which was 93.2 times that of neat *** the impact strength of the blend reached the maximum value of 74.7 k J/m~2,which was 21.3 times that of neat ***,the PLLA/PBST/ADR blend exhibited excellent lowtemperature toughness and *** –20 ℃,the elongation at break of the PLLA/PBST/ADR blend was as high as 93.2%,and the impact strength reached 18.8 k J/m~***,the tensile strength of the blend at low temperature was also high(64.7 MPa),which was beneficial to the application of PLA in the low temperature *** addition,the PLLA/PBST/ADR blend maintaind good biodegradability,which was of great significance to the wide application of PLLA.

关键词： Poly(L-lactic acid) PBST Compatibilization Super toughness Low-temperature mechanical properties Biodegradability

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Symmetry and monotonicity of positive solutions to Schr?dinger systems with fractional p-Laplacians

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Applied Mathematics(A Journal of Chinese Universities) 2022年第1期37卷 52-72页

作者： MA ling-wei ZHANG Zhen-qiu School of Mathematical Sciences Tianjin Normal UniversityTianjin 300387China School of Mathematical Sciences and LPMC Nankai UniversityTianjin 300071China

In this paper,we first establish narrow region principle and decay at infinity theorems to extend the direct method of moving planes for general fractional p-Laplacian *** virtue of this method,we investigate the qualitative properties of positive solutions for the following Schrodinger system with fractional p-Laplacian{(-△)^(s)_(p)u+au^(p-1)=f(u,v),(-△)^(t)_(p)v+bv(p-1)=g(u,v),where 0

关键词： fractional p-Laplacian Schr?dinger systems direct method of moving planes radial symmetry monotonicity nonexistence

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Radiolarian biogeography in surface sediments of the Northwest Pacific marginal seas

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Science China Earth Sciences 2017年第3期60卷 517-530页

作者： LIU ling ZHANG Qiang CHEN MuHong ZHANG LanLan xiang Rong South China Sea Institute of Oceanology Chinese Academy of SciencesKey Laboratory of Marginal Sea GeologyChinese Academy of SciencesGuangzhou 510301China University of Chinese Academy of Sciences Beijing 100039China Key Laboratory of Marine Mineral Resources Ministry of Land and ResourcesGuangzhou 510075China

Overall abundance and species composition of radiolarian faunas were analyzed in surface sediment samples from representative areas of South China Sea, East China Sea, Sea of Japan, Sea of Okhotsk, Bering Sea, Philippine Sea, and the western boundary current regions of the North Pacific, in order to understand the biogeographic distribution ofradiolarians in the Northwest Pacific and explore its relationship with the main environmental factors and the North Pacific circulation. The results showed that radiolarians in the Northwest Pacific surface sediments can be divided into two large biogeographic provinces---cluster A and cluster B. Cluster A is characterized by the dominance of warm-water species and distributed primarily in tropical and subtropical seas with high radiolarian abundance and diversity; whereas cluster B is predominated by cold water species and distributed mainly in the Arctic and subarctic seas with comparably low abundance and diversity. Cluster A is further divided into five subclusters, AI to A5, which correspond to East China Sea, Philippine Sea, South China Sea, Sea of Japan, and Kuroshio Current, respectively; cluster B is divided into three subclusters, B1 to B3, which correspond to Sea of Okhotsk, Bering Sea, and subarctic gyre area, respectively. Based on the relationships between radiolarian faunas and major environment parameters in different biogeographic provinces, we suggest that the sea surface temperature （SST） and sea surface salinity （SSS） are primary factors that influence productivity, composition, and distribution pattern of the radiolarian fauna in the Northwest Pacific regions, while water depth is likely responsible for regional differences in the radiolarian fauna in each marginal sea. In addition, according to the distribution and abundance patterns of common radiolarian species in different areas, we identified five special radiolarian assemblages, which may be used as indicators for main Kuroshio Current, Kuroshio-East

关键词： Northwest Pacific Marginal seas Radiolarian Biogeography North Pacific circulation

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一种PIC荧光免疫层析检测方法的建立

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生物技术 2021年第1期31卷 38-45页

作者：陈慧邓春泉何燕燕吴配配褚光亮项伟玲金丽琴杭州博茵生物技术有限公司浙江杭州311188 浙江省人民医院输血科浙江杭州310014 温州医科大学检验医学院生命科学学院浙江温州325035

[目的]建立一种PIC荧光免疫层析检测方法。[方法]以天然PIC为免疫原,使用快速免疫方案免疫BALB/C小鼠,利用常规单抗制备技术制备抗PIC单抗;以PIC、α2-AP、PLG为筛选源使用间接ELISA进行单克隆抗体筛选;通过Western Blot及间接ELISA对... 详细信息

[目的]建立一种PIC荧光免疫层析检测方法。[方法]以天然PIC为免疫原,使用快速免疫方案免疫BALB/C小鼠,利用常规单抗制备技术制备抗PIC单抗;以PIC、α2-AP、PLG为筛选源使用间接ELISA进行单克隆抗体筛选;通过Western Blot及间接ELISA对抗体的抗原识别表位及特异性进行鉴定;通过间接ELISA对抗体类型及亲和常数进行检测;通过双抗夹心法筛选出抗PIC抗体的最优配对,建立PIC的荧光免疫层析检测方法;对建立的方法进行灵敏度和精密度测试;使用65例临床样本初步评价与Sysmex试剂的相关性。[结果]获得了一对针对PIC新抗原的最优配对单抗B6A02和B6A23,抗体属于Ig G并对PIC有较高亲和力(亲和常数达到10-9),并使用B6A02和B6A23分别作为包被抗体和检测抗体制备PIC检测试剂,该试剂在40~40 000 ng/m L范围内呈良好的线性关系(R2=0.997);灵敏度为40 ng/m L;批间CV不高于5.47%;与Sysmex的PIC检测试剂相关性良好(R2=987)。[结论]使用针对PIC新抗原表位建立了PIC荧光免疫层析检测试剂,具有灵敏度高、精密度好、特异性强等特点,与Sysmex试剂检测结果符合率高。

关键词：纤溶酶-α2纤溶酶抑制剂复合物(PIC) 单克隆抗体荧光免疫层析技术相关性

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Multi-instance partial-label learning: towards exploiting dual inexact supervision

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Science China(Information Sciences) 2024年第3期67卷 48-61页

作者： wei TANG weijia ZHANG Min-ling ZHANG School of Computer Science and Engineering Southeast University Key Laboratory of Computer Network and Information Integration (Southeast University) Ministry of Education School of Information and Physical Sciences The University of Newcastle

Weakly supervised machine learning algorithms are able to learn from ambiguous samples or labels, e.g., multi-instance learning or partial-label learning. However, in some real-world tasks, each training sample is associated with not only multiple instances but also a candidate label set that contains one groundtruth label and some false positive labels. Specifically, at least one instance pertains to the ground-truth label while no instance belongs to the false positive labels. In this paper, we formalize such problems as multi-instance partial-label learning(MIPL). Existing multi-instance learning algorithms and partial-label learning algorithms are suboptimal for solving MIPL problems since the former fails to disambiguate a candidate label set, and the latter cannot handle a multi-instance bag. To address these issues, a tailored algorithm named MIPLGP, i.e., multi-instance partial-label learning with Gaussian processes, is *** first assigns each instance with a candidate label set in an augmented label space, then transforms the candidate label set into a logarithmic space to yield the disambiguated and continuous labels via an exclusive disambiguation strategy, and last induces a model based on the Gaussian processes. Experimental results on various datasets validate that MIPLGP is superior to well-established multi-instance learning and partial-label learning algorithms for solving MIPL problems.

关键词： machine learning multi-instance partial-label learning multi-instance learning partial-label learning Gaussian processes

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Carbon dot-modified silicon nanoparticles for lithium-ion batteries

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International Journal of Minerals,Metallurgy and Materials 2021年第10期28卷 1603-1610页

作者： Qiao-kun Du Qing-xia Wu Hong-xun Wang xiang-juan Meng Ze-kai Ji Shu Zhao wei-wei Zhu Chuang Liu Min ling Cheng-du Liang Zhejiang Provincial Key Laboratory of Advanced Chemical Engineering Manufacture Technology College of Chemical and Biological EngineeringZhejiang UniversityHangzhou 310027China Zhejiang Research Institute of Chemical Industry Hangzhou 310000China Sinochem Lantian Corporation Hangzhou 310000China

Silicon(Si)particles were functionalized using carbon dots(CDs)to enhance the interaction between the Si particles and the ***,CDs rich in polar groups were synthesized using a simple hydrothermal ***,CDs were loaded on the Si surface by impregnation to obtain the functionalized Si particles(Si/CDs).The phases and microstructures of the Si/CDs were observed using Fourier-transform infrared reflection,X-ray diffraction,scanning electron microscopy,and high-resolution transmission electron ***/CDs were used as the active material of the anode for electrochemical performance *** electrochemical performance of the Si/CD electrode was assessed using cyclic voltammetry,electrochemical impedance spectroscopy,and constant current charge and discharge *** electrodes prepared with Si/CDs showed good mechanical structure stability and electrochemical *** 150 cycles at 0.2 C,the capacity retention rate of the Si/CD electrode was 64.0%,which is twice as much as that of pure Si electrode under the same test conditions.

关键词： binder silicon anodes lithium-ion batteries carbon dot multifunctional

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