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Theory and Application of Natural-Based Wavelet Method

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Journal of Harbin Institute of Technology(New Series) 2019年第6期26卷 86-90页

作者： Yanhua Cao Mengcheng Chen Baogen Xu School of Science East China Jiaotong UniversityNanchang 330013China Institute of Architecture and Civil Engineering East China Jiaotong UniversityNanchang 330013China

Wavelet method is often used in analyzing trend and period of time sequence. When using wavelet method one serious problem is different chosen wavelet basis and scale would lead to different results. Sometimes, the results vary greatly. To overcome this problem and to improve the accuracy and efficiency, a new method denoted by Natural-based Wavelet Method is introduced and extended. It can be proved that the proposed method in fact is a special class of discrete wavelet. At first, two numerical examples are designed to show the capacity of the novel method. Second, this method is applied to a precipitation series. According to wavelet analysis and short-range precipitation prediction, this precipitation exists a faintly increasing trend. Through the analysis, the studied precipitation has two major periods: 11 and 41 years. The results validate that the Natural-based Wavelet Method used in application of multi-complicated observed data is suitable. It is easy to write the source code of the proposed method. When new information appears, new information can be easily added into the original sequence, this is another advantage of the proposed method.

关键词： natural-based wavelet method long-time precipitation sequence short-range precipitation time sequence

On Locating Numbers of Graphs

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Journal of Harbin Institute of Technology(New Series) 2018年第1期25卷 93-96页

作者： Baogen Xu Chunhua Li Zhizhu Fan Department of Mathematics East China Jiaotong University

Let G =( V,E) be a connected graph and W = { w_1,w_2,…,w_k} be an ordered subset of V( G).For any vertex v ∈V,the locating code of v with respect to W is the k-vector CW( v) = { d( v,w_1),d( v,w_2),…,d( v,w_k) },W is said to be a locating set of G if distinct vertices have the distinct locating code,and the locating number of G is defined as: Loc( G) = min{ | W| : W is a locating set of G}.We study the locating set and locating number of a graph G,obtain some bounds for the locating numbers of graphs,and determine the exact value of Loc( G) for some special classes of graphs,such as cycles,wheels,complete t-partite graph and some Cartesian products of paths and cycles. In addition,we also prove that Loc( T) ≥Δ-1 holds for all trees T with maximum degree Δ,and shows a tree T with Loc( T) = Δ-1.

关键词： graph locating code locating set locating number Cartesian products

On the Mixed Minus Domination in Graphs

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Journal of the Operations Research Society of China 2013年第3期1卷 385-391页

作者： Baogen Xu Xiangyang Kong Department of Mathematics East China Jiaotong UniversityNanchangJiangxi 330013China

Let G=(V,E)be a graph,for an element x∈V∪E,the open total neighborhood of x is denoted by N_(t)(x)={y|y is adjacent to x or y is incident with x,y∈V∪E},and Nt[x]=Nt(x)∪{x}is the closed one.A function f:V(G)∪E(G)→{−1,0,1}is said to be a mixed minus domination function(TMDF)of G if∑_(y∈Nt[x])f(y)≥1 holds for all x∈V(G)∪E(G).The mixed minus domination numberγ′_(tm)(G)of G is defined as γ′_(tm)(G)=min{∑x∈V∪E f(x)|f is a TMDF of G.In this paper,we obtain some lower bounds of the mixed minus domination number of G and give the exact values ofγ′_(tm)(G)when G is a cycle or a path.

关键词： Mixed minus domination function Mixed minus domination number

Large magnetocaloric effect in metamagnetic HoPdAl

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Science China(Technological Sciences) 2012年第2期55卷 445-450页

作者： xu ZhiYi SHEN baogen State Key Laboratory for Magnetism Institute of PhysicsChinese Academy of SciencesBeijing 100190China

Magnetic properties and magnetocaloric effects(MCEs) of the HoPdAl compounds with the hexagonal ZrNiAl-type and the orthorhombic TiNiSi-type structures are investigated.Both the compounds are found to be antiferromagnet with the Néel temperature TN=12 and 10 K,respectively.A field-induced metamagnetic transition from antiferromagnetic(AFM) state to ferromagnetic(FM) state is observed below TN.For the hexagonal HoPdAl,a small magnetic field can induce an FM-like state due to a weak AFM coupling,which leads to a high saturation magnetization and gives rise to a large MCE around TN.The maximal value of magnetic entropy change(?SM) is-20.6 J/kg K with a refrigerant capacity(RC) value of 386 J/kg for a field change of 0-5 T.For the orthorhombic HoPdAl,the critical field required for metamagnetic transition is estimated to be about 1.5 T,showing a strong AFM coupling.However,the maximal SM value is still-13.7 J/kg K around TN for a field change of 0-5 T.The large reversible SM and considerable RC suggest that HoPdAl may be an appropriate candidate for magnetic refrigerant in a low temperature range.

关键词：磁热效应原子力显微镜高饱和磁化强度钢筋混凝土反铁磁 AFM 磁学性质化合物

基于变化向量的耕地利用方式变化下耕地质量评价

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农业工程学报 2020年第2期36卷 292-300页

作者：祝锦霞徐保根浙江财经大学土地与城乡发展研究院杭州310018

耕地利用方式变化下耕地质量的变化研究意义重大。该文以浙江省耕地质量监测试点松阳县为例,以变化向量凸显耕地利用方式变化,探讨基于变化向量的耕地利用方式变化下耕地质量变化的快速评价方法。充分考虑各特征向量之间的联系以及不同... 详细信息

耕地利用方式变化下耕地质量的变化研究意义重大。该文以浙江省耕地质量监测试点松阳县为例,以变化向量凸显耕地利用方式变化,探讨基于变化向量的耕地利用方式变化下耕地质量变化的快速评价方法。充分考虑各特征向量之间的联系以及不同意义不同量纲元素间的共同作用问题,选择典型相关分析CCA(canonical correlation analysis)构建变化向量;采用CCA为基础的多元变化检测MAD(multivariate alteration detection)最大限度的消除相关性影响,以方差最大的形式凸显耕地利用方式变化下耕地质量的变化;选择基于高斯混合模型(GMM)的期望最大化算法(EM)快速评价耕地利用方式变化下耕地质量的变化情况。重点分析基于快速评价的耕地利用方式变化下耕地质量变化区域的空间分布及其和传统因素法的对比分析。结果表明:基于变化向量法得到的耕地质量变化结果与传统的因素法在监测耕地质量水平不变的吻合度在80%~100%以上,耕地质量水平提高的吻合度在16.6%~50%,耕地质量水平下降的吻合度在66.7%~100%。提出的基于变化向量法的耕地质量变化评价模型能对耕地利用方式变化下耕地的质量变化做出正确的评价,评价方法科学、合理、易操作推广,为合理优化配置耕地利用方式提供定量数据支撑。

关键词：土地利用等别变化向量耕地质量

Giant low-field magnetocaloric effect in ferromagnetically ordered Er_(1-x)Tm_(x)Al_(2)(0≤x≤1)compounds

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Journal of Materials Science & Technology 2023年第15期146卷 168-176页

作者： Shuxian Yang Xinqi Zheng Dingsong Wang Juping xu Wen Yin Lei Xi Chaofan Liu Jun Liu Jiawang xu Hu Zhang Zhiyi xu Lichen Wang Yihong Yao Maosen Zhang Yichi Zhang Jianxin Shen Shouguo Wang baogen Shen School of Materials Science and Engineering Beijing Advanced Innovation Center for Materials Genome EngineeringUniversity of Science and Technology BeijingBeijing 100083China Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of Sciences&University of Chinese Academy of SciencesBeijing 100190China Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China Spallation Neutron Source Science Center Dongguan 523803China School of Materials Science and Engineering Anhui UniversityHefei 230601China Department of Energy and Power Engineering School of Mechanical EngineeringBeijing Institute of TechnologyBeijing 100081China Songshan Lake Materials Laboratory Dongguan 523808China Ganjiang Innovation Academy Chinese Academy of SciencesGanzhou 341000China Ningbo Institute of Materials Technology and Engineering Chinese Academy of SciencesNingbo 315201China

Magnetocaloric material is the key working substance for magnetic refrigerant technology,for which the low-field and low-temperature magnetocaloric effect(MCE)performance is of great importance for practical applications at low temperatures.Here,a giant low-field magnetocaloric effect in ferromagnetically ordered Er_(1-x)Tm_(x)Al_(2)(0≤x≤1)compounds was reported,and the magnetic structure was characterized based on low-temperature neutron powder diffraction.With increasing Tm content from 0 to 1,the Curie temperature of Er_(1-x)Tm_(x)Al_(2)(0≤x≤1)compounds decreases from 16.0 K to 3.6 K.For Er_(0.7)Tm_(0.3)Al_(2) compound,it showed the largest low-field magnetic entropy change(–SM)with the peak value of 17.2 and 25.7 J/(kg K)for 0–1 T and 0–2 T,respectively.The(–SM)max up to 17.2 J/(kg K)of Er0.7Tm0.3Al2 compound for 0–1 T is the largest among the intermetallic magnetocaloric materials ever reported at temperatures below 20 K.The peak value of adiabatic temperature change(Tad)max was determined as 4.13 K and 6.87 K for 0–1 T and 0–2 T,respectively.The characteristic of second-order magnetic transitions was confirmed on basis of Arrott plots,the quantitative criterion of exponent n,rescaled universal curves,and the mean-field theory criterion.The outstanding low-field MCE performance with low working temperatures indicates that Er_(1-x)Tm_(x)Al_(2)(0≤x≤1)compounds are promising candidates for magnetic cooling materials at liquid hydrogen and liquid helium temperatures.

关键词： Magnetocaloric effect Low field magnetocaloric effect Magnetic structure RAl_(2)compounds

Development of Insertion and Deletion Markers for Bottle Gourd Based on Restriction Site-associated DNA Sequencing Data

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Horticultural Plant Journal 2017年第1期3卷 13-16页

作者： WU Xinyi xu Pei WU Xiaohua WANG baogen LU Zhongfu LI Guojing Institute of Vegetables State Key Lab Breeding Base for Sustainable Control of Plant Pest and DiseaseZhejiang Academy of Agricultural Sciences

Bottle gourd is an important cucurbit crop worldwide. To provide more available molecular markers for this crop, a bioinformatic approach was employed to develop insertion–deletions(In Dels) markers in bottle gourd based on restriction site-associated DNA sequencing(RAD-Seq)data. A total of 892 Indels were predicted, with the length varying from 1 bp to 167 bp. Single-nucleotide In Dels were the predominant types of In Dels. To validate these In Dels, PCR primers were designed from 162 loci where In Dels longer than 2 bp were predicated. A total of 112 In Dels were found to be polymorphic among 9 bottle gourd accessions under investigation. The rate of prediction accuracy was thus at a high level of72.7%. DNA fingerprinting for 4 cultivars were performed using 8 selected Indels markers, demonstrating the usefulness of these markers.

关键词： bottle gourd InDels markers RAD-Seq DNA fingerprinting

A universal pipeline for mobile mRNA detection and insights into heterografting advantages under chilling stress

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Horticulture Research 2020年第1期7卷 2575-2584页

作者： Ying Wang Lingping Wang Nailin Xing Xiaohua Wu Xinyi Wu baogen Wang Zhongfu Lu Pei xu Ye Tao Guojing Li Yuhong Wang Institute of Vegetables Zhejiang Academy of Agricultural SciencesHangzhou 310021China Institute of Vegetables Ningbo Academy of Agricultural SciencesNingbo 315040China State Key Laboratory for Quality and Safety of Agroproducts Zhejiang Academy of Agricultural SciencesHangzhou 310021China Biozeron Biotechnology Co. Ltd.Shanghai 201800China Present address:College of Life Sciences China Jiliang UniversityHangzhou 310018China

Heterografting has long been used to enhance the chilling tolerance of temperature-sensitive crops,including watermelon,whose mechanism is known to involve bidirectional long-distance mRNA movements.Despite several studies reporting on mobile mRNA(mb-mRNA)profiles in plants,accurate identification of mb-mRNAs is challenging owing to an array of technical problems.Here,we developed a bioinformatical pipeline that took most of the known technical concerns into consideration and is considered to be a universal tool for mb-mRNA detection in heterografts.By applying this pipeline to a commercial watermelon–bottle gourd heterografting system,we detected 130 and 1144 mb-mRNAs upwardly and 167 and 1051 mb-mRNAs downwardly transmitted under normal and chilling-stress conditions,respectively.Quantitative real-time PCR indicated a high accuracy rate(88.2%)of mb-mRNA prediction with our pipeline.We further revealed that the mobility of mRNAs was not associated with their abundance.Functional annotation and classification implied that scions may convey the stress signal to the rootstock,subsequently triggering energy metabolism reprogramming and abscisic acid-mediated stress responses by upward movement of effective mRNAs,ultimately leading to enhanced chilling tolerance.This study provides a universal tool for mb-mRNA detection in plant heterografting systems and novel insights into heterografting advantages under chilling stress.

关键词： metabolism grafting stress

Development and application of the new BPM system data processing program at Hefei light source

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Nuclear Science and Techniques 2012年第5期23卷 261-266页

作者： MA Tianji YANG Yongliang SUN baogen ZOU Junying LU Ping ZHOU Zeran xu Hongliang NSRL School of Nuclear Science and Technology University of Science and Technology of China Hefei 230029 China

A data processing program has been applied for the new beam position monitor (BPM) system of the storage ring at Hefei Light Source (HLS). The new BPM system in the upgrade project will be equipped with Libera Brilliance BPM processors to replace the old Bergoz MX-BPM processors. The embedded Linux system on Libera has completed some important work, including instrument status check,data acquisition, position calculation, EPICS IOC data release,and so on. A new EPICS record type has been developed to recalculate the beam position with log-ratio method. The property of the new position data was analyzed in the time and frequency domain. The results show that the rms value of beam position measurement resolution can be up to submicron. Preliminary studies have been carried out on the measurement of the tune and the beam lifetime with this new BPM system.

关键词：数据处理程序 PM系统合肥光源嵌入式Linux系统 EPICS 应用开发位置数据