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Chinese Journal of Electronics 2024年第2期33卷 423-435页

作者： juncai he Zhenxue he Jia LIU Yan ZHANG Fan ZHANG Fangfang LIANG Tao WANG Limin XIAO Xiang WANG hebei Agricultural University Beijing Information Science and Technology University School of Computer Science and Engineering Beihang University School of Electronic and Information Engineering Beihang University

Power is an issue that must be considered in the design of logic circuits. Power optimization is a combinatorial optimization problem, since it is necessary to search for a logical expression that consumes the least amount of power from a large number of Reed-Muller(RM) logical expressions. The existing approach for optimizing the power of multi-output mixed polarity RM(MPRM) logic circuits suffer from poor optimization results. To solve this problem, a whale optimization algorithm with two-populations strategy and mutation strategy(TMWOA) is proposed in this paper. The two-populations strategy speeds up the convergence of the algorithm by exchanging information about the two-populations. The mutation strategy enhances the ability of the algorithm to jump out of the local optimal solutions by using the information of the current optimal solution. Based on the TMWOA, we propose a multi-output MPRM logic circuits power optimization approach(TMMPOA). Experiments based on the benchmark circuits of the Microelectronics Center of North Carolina(MCNC) validate the effectiveness and superiority of the proposed TMMPOA.

关键词： Logic circuits Benchmark testing Search problems Whale optimization algorithms Microelectronics Optimization Convergence

Three New Hydroxytetradecenals from Amomum tsao-ko with Protein Tyrosine Phosphatase 1B and Glycogen Phosphorylase Inhibitory Activity

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Phyton-International Journal of Experimental Botany 2024年第5期93卷 875-883页

作者： Xiaolu Qin Xinyu Li Yi Yang Mei Huang Shengli Wu Pianchou Gongpan Lianzhang Wu juncai he Changan Geng State Key Laboratory of Phytochemistry and Plant Resources in West China Kunming Institute of BotanyChinese Academy of SciencesKunming650201China Nujiang Green Spice Industry Research Institute Lushui673100China University of Chinese Academy of Sciences Beijing100049China

The fruits of Amomum tsao-ko(Cao-Guo)were documented in Chinese Pharmacopoeia for the treatment of abdominal pain,vomiting,and *** our previous study,a series of diarylheptanes and flavonoids withα-glucosidase and protein tyrosine phosphatase 1B(PTP1B)inhibitory activity have been reported from the middle-polarity part of ***-ko,whereas the antidiabetic potency of the low-polarity constituents is still *** this study,three new hydroxytetradecenals,(2E,4E,8Z,11Z)-6R-hydroxytetradeca-2,4,8,11-tetraenal(1),(2E,4E,8Z)-6R-hydroxytetradeca-2,4,8-trienal(2)and(2E,4E)-6R-hydroxytetradeca-2,4-dienal(3)were obtained from the volatile oils of *** structures of compounds 1–3 were determined using spectroscopic data involving 1D and 2D nuclear magnetic resonance(NMR),high-resolution mass spectra(HRMS),and specific rotation([α]D).Their hypoglycemic activity was evaluated against glycogen phosphorylase(GPa)and *** 1 and 2 displayed moderate activity against PTP1B with inhibition rates of 33.8%−50.3%at 100 and 200μ***,compound 1 exhibited an obvious inhibitory effect on GPa(IC50=31.7μM),whereas compound 2 was *** study demonstrates hydroxytetradecenals as the characteristic components of ***-ko with therapeutic potential in diabetes.

关键词： Cao-Guo PTP1B and GPa inhibitors diabetes mellitus volatile oils

云南怒江州不同地区草果种质资源农艺表型性状的遗传多样性分析

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热带作物学报 2024年第6期45卷 1157-1166页

作者：张映萍吉训志余少洪苏凡秦晓威郝朝运吴莲张徐飞和俊才和卫东友胜军怒江绿色香料产业研究院云南怒江673200 中国热带农业科学院香料饮料研究所海南万宁571533 海南省热带香辛饮料作物遗传改良与品质调控重点实验室海南万宁571533 海南省特色热带作物适宜性加工与品质控制重点实验室海南万宁571533

为了探究不同地区草果种质资源农艺表型性状的遗传多样性。以云南怒江州不同地区的草果种质资源为材料,通过测定其8个农艺表型性状,运用变异系数、遗传多样性指数、方差分析、相关性分析、聚类分析、主成分分析与综合评价的方法分析草... 详细信息

为了探究不同地区草果种质资源农艺表型性状的遗传多样性。以云南怒江州不同地区的草果种质资源为材料,通过测定其8个农艺表型性状,运用变异系数、遗传多样性指数、方差分析、相关性分析、聚类分析、主成分分析与综合评价的方法分析草果农艺表型性状的遗传多样性。结果表明:各农艺表型性状均存在较大变异,变异系数为7.63%~32.51%,其中分蘖数的变异系数最大;各性状间表现出较好的多样性,shannon-wiener指数(Hʹ)范围为1.933~2.355,平均值为2.024;各农艺表型性状不同种质间存在显著差异(P<0.05);果实纵径与果型指数、果重存在极显著的正相关关系,果实横径与果重存在极显著的正相关关系,果型指数与叶宽存在显著负相关关系;聚类分析将不同地区草果种质资源分为2个类群,其中来自福贡县与来自泸水市的草果种质资源各自聚成一类;从8个农艺表型性状中共提取出3个主成分,累计贡献率达到76.940%,能综合反映草果农艺表型性状的大部分信息;综合评价结果表明,SD12、SD20、SD7、SD17、SD18、SD5排在前6位,综合表现较好。上述结果说明,云南怒江州不同地区24份草果种质资源农艺表型性状的遗传多样性较为丰富,不同地区的草果种质资源变异性较明显,其中SD12、SD20、SD7、SD17、SD18、SD5草果的农艺表型性状综合表现较好,是较适合用于育种的优质种质资源。

关键词：草果农艺表型性状遗传多样性聚类分析综合评价

MgNet: A unified framework of multigrid and convolutional neural network

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Science China Mathematics 2019年第7期62卷 1331-1354页

作者： juncai he Jinchao Xu School of Mathematical Sciences Peking University Beijing 100871 China Department of Mathematics The Pennsylvania State University University Park PA 16802 USA

We develop a unified model, known as MgNet, that simultaneously recovers some convolutional neural networks (CNN) for image classification and multigrid (MG) methods for solving discretized partial differential equations (PDEs). This model is based on close connections that we have observed and uncovered between the CNN and MG methodologies. For example, pooling operation and feature extraction in CNN correspond directly to restriction operation and iterative smoothers in MG, respectively. As the solution space is often the dual of the data space in PDEs, the analogous concept of feature space and data space (which are dual to each other) is introduced in CNN. With such connections and new concept in the unified model, the function of various convolution operations and pooling used in CNN can be better understood. As a result, modified CNN models (with fewer weights and hyperparameters) are developed that exhibit competitive and sometimes better performance in comparison with existing CNN models when applied to both CIFAR-10 and CIFAR-100 data sets.

关键词： convolutional neural network multigrid unified framework net work architecture

7种不同果型草果果粉的理化指标及挥发性成分分析

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热带作物学报 2024年第4期45卷 813-824页

作者：张映萍徐飞穆明兴友胜军和俊才苏凡吉训志王灿郝朝运秦晓威谷风林吴桂苹怒江绿色香料产业研究院云南怒江673200 中国热带农业科学院香料饮料研究所海南万宁571533 海南省热带香辛饮料作物遗传改良与品质调控重点实验室海南万宁571533 海南省特色热带作物适宜性加工与品质控制重点实验室海南万宁571533

为了探究不同果型草果果粉的理化指标及其挥发性成分的差异,以怒江州泸水市草果果粉为原料,探究不同果型草果果粉的色差、挥发油含量、含水量、粒径、表面微观结构等理化指标,并采用顶空固相微萃取和气相色谱-质谱联用技术分析草果果粉... 详细信息

为了探究不同果型草果果粉的理化指标及其挥发性成分的差异,以怒江州泸水市草果果粉为原料,探究不同果型草果果粉的色差、挥发油含量、含水量、粒径、表面微观结构等理化指标,并采用顶空固相微萃取和气相色谱-质谱联用技术分析草果果粉的挥发性成分。结果表明:7种不同果型草果果粉的色差值△E为(19.17±0.29)~(25.15±0.17),L值在(72.50±0.23)~(76.87±0.07)范围内,a值为(5.17±0.05)~(6.97±0.15),b值为(12.35±0.43)~(16.91±0.43);挥发油含量为(0.76±0.01)~(1.30±0.26)mL/100 g;含水量为(11.13%±0.12%)~(15.05%±0.23%);粒径方面NL5、NL6草果果粉粉体颗粒差异最大。7种不同果型草果果粉中共检测出31种挥发性成分,共有成分17种,主要为醛类和醇类物质,包括反-2-癸烯醛、桉叶油醇、柠檬醛、香叶醇、乙酸香叶酯等。其中NL2草果果粉检出的挥发性成分最多,共28种,且反-2-癸烯醛相对含量最高,为22.24%±2.29%,NL5草果果粉中桉叶油醇的相对含量最高,为17.52%±2.16%。因此,不同果型草果果粉在色差、挥发油含量、含水量、粒径、表面微观结构上均存在一定差异,不同果型草果果粉的挥发性成分既有共性特征又有差异性。该研究结果可为优质纯天然草果果粉的生产及应用提供理论指导。

关键词：草果果粉理化指标挥发性成分

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RELU DEEP NEURAL NETWORKS AND LINEAR FINITE ELEMENTS

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Journal of Computational Mathematics 2020年第3期38卷 502-527页

作者： juncai he Lin Li Jinchao Xu Chunyue Zheng School of Mathematical Sciences Peking UniversityBeijing 100871China Beijing International Center for Mathematical Research Peking UniversityBeijing 100871China Department of Mathematics Pennsylvania State UniversityState CollegePA 16802USA

In this paper,we investigate the relationship between deep neural net works(DNN)with rectified linear unit(ReLU)function as the activation function and continuous piecewise linear(CPWL)functions,especially CPWL functions from the simplicial linear finite element method(FEM).We first consider the special case of *** exploring the DNN representation of its nodal basis functions,we present a ReLU DNN representation of CPWL in *** theoretically establish that at least 2 hidden layers are needed in a ReLU DNN to represent any linear finite element functions inΩ■R^2 when d≥***,for d=2,3 which are often encountered in scientific and engineering computing,the minimal number of two hidden layers are necessary and sufficient for any CPWL function to be represented by a ReLU *** we include a detailed account on how a general CPWL in R^d can be represented by a ReLU DNN with at most[log2(d+1)]|hidden layers and we also give an estimation of the number of neurons in DNN that are needed in such a represe ***,using the relationship bet ween DNN and FEM,we theoretically argue that a special class of DNN models with low bit-width are still expected to have an adequate representation power in ***,as a proof of concept,we present some numerical results for using ReLU DNNs to solve a two point boundary problem to demonstrate the potential of applying DNN for numerical solution of partial differential equations.

关键词： Finite element method Deep neural network Piecewise linear function

Experimental and simulation research on hollow AZ31 magnesium alloy three-channel joint by hot extrusion forming with sand mandrel

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Journal of Magnesium and Alloys 2024年第1期12卷 98-109页

作者： Shi Shengnan Wang Hongyu Teng Fei Jiang Lei Sun juncai Sun Jie Zhang Shunhu Transportation Engineering College Dalian Maritime UniversityDalianLiaoning 106026China State Key Laboratory of Rolling and Automation Northeastern UniversityShenyangLiaoning 110819China Shagang School of Iron and Steel Soochow UniversitySuzhouJiangsu 215021China

Magnesium alloy is one of the lightest metal structural *** weight is further reduced through the hollow ***,the hollow structure is easily damaged during *** order to maintain the hollow structure and to transfer the stresses during the high temperature deformation,the sand mandrel is *** this paper,the hollow AZ31 magnesium alloy three-channel joint is studied by hot extrusion *** as one of solid granule medium is used to fill the hollow magnesium *** extrusion temperatures are 230℃ and 300℃,*** process parameters(die angle,temperature,bottom thickness,sidewall thickness,edge-to-middle ratio in bottom,bottom shape)of the hollow magnesium alloy are analyzed based on the results of experiments and the finite element *** results are shown that the formability of the hollow magnesium alloy will be much better when the ratio of sidewall thickness to the bottom thickness is 1:*** when edge-to-middle ratio in bottom is about 1:1.5,a better forming product can be *** best bottom shape in these experiments will be convex based on the forming *** grain will be refined obviously after the *** the microstructures will be shown as *** these lines will be well agreement with the mold in the corner.

关键词： AZ31 magnesium alloy Three-channel joint Sand Experiments and the finite element Die angle

An effective strategy for dendrite free Li metal anodes:Nickel foam decorated with high lattice-matching CoN and CoF_(2) nanosheets for dense deposition

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Nano Research 2024年第5期17卷 4069-4078页

作者： Wenlong Liu Jianzong Man Xiaodong Sun Ning Zhang Yehong Du Kun Liu Zhongsheng Wen Song Li juncai Sun Institute of Materials and Technology Dalian Maritime UniversityDalian 116026China Shandong Provinvial Key Laboratory of Chemical Energy Storage and Novel Cell Technology and School of Chemistry and Chemical enginneringLiaocheng UniversityLiaocheng 252000China Department of Public Security Management Liaoning Police CollegeDalian 116036China

The notorious dendrite and infinite volume change seriously restrict the advancement of lithium metal anodes(LMAs),during the long-term process of stripping/***,the nanosheets of metal fluoride(CoF_(2))and metal nitride(CoN)with magnificent lithiophilicity on the nickel(Ni)foam are designed as the“regulator”to uniform the Li plating and build stronger solid electrolyte interface(SEI)layer for dendrite free *** Ni foam offers abundant space to receive deposited Li *** CoN nanosheets can guarantee the fast transfer of electrons,which provides a stable interface of Li^(+)***,the nanosheet structure with lithiophilicity would accelerate the move of Li+and decrease the nucleation barrier,due to the high lattice-matching of Li and ***,the CoF_(2) could increase the content of F(LiF)in the SEI layer,which enhances the strength and avoids the destruction of SEI *** the cooperation of CoN and CoF_(2),the composited anode(Li/NF@CNCF)exhibits ultra-long cycle performance(more than 1200 h)and fantastic structure stability at 1 mA·cm^(-2) with 1 mAh·cm^(-2).Based on the LiFePO_(4) and Li/NF@CNCF,the full cells deliver excellent specifical capacity and steady coulombic *** strategy contributes an effective approach to alleviate the issues of lithium metal anodes in the field of LMAs.

关键词： CoN and CoF_(2) lattice-matching nanosheet lithiophilicity lithium metal anodes

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含各向异性层的多层结构中的横波传播

应用基础与工程科学学报 2017年第1期25卷 171-186页

作者：丁俊才吴斌何存富李子明北京工业大学机械工程与应用电子技术学院北京100124

对含有各向异性层的多层结构中波传播问题的数学描述非常复杂,这一复杂性源于界面的多样性和各向异性介质物理性质的特殊性.针对此问题,基于传递矩阵方法,以界面为刚性连接的各向同性/正交各向异性/各向同性3层结构为例,导出了此类结构... 详细信息

对含有各向异性层的多层结构中波传播问题的数学描述非常复杂,这一复杂性源于界面的多样性和各向异性介质物理性质的特殊性.针对此问题,基于传递矩阵方法,以界面为刚性连接的各向同性/正交各向异性/各向同性3层结构为例,导出了此类结构中SV波和最低阶模态SH波(即SH0)的反射与透射系数表达式.利用数值模拟研究了入射角度、频厚积和中间层介质对横波传播特性的影响.结果表明:SV波入射多层结构会有临界角存在,SH波入射无此现象.当声波垂直入射,随着频厚积的增大,多层结构中SV和SH波的反射和透射系数曲线会产生多阶谐振.研究结果为实际实验中采用横波入射检测类似于各向同性/正交各向异性/各向同性的多层结构提供了理论依据.

关键词：正交各向异性多层结构传递矩阵法 SV和SH波多阶谐振

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直井防斜钻具组合技术综述

天然气工业 2000年第1期20卷 50-53页

作者：殷朝阳柏景海何俊才大庆石油管理局钻井二公司

在石油及天然气钻井过程中，影响井斜的因素是多方面的，钻具组合及其操作技术对控制井斜起着至关重要的作用。随着钻具组合技术的发展，控制井斜的技术水平和能力也不断提高。文章对旋转钻井过程中，国内外一些具有代表性的直井防斜钻... 详细信息

在石油及天然气钻井过程中，影响井斜的因素是多方面的，钻具组合及其操作技术对控制井斜起着至关重要的作用。随着钻具组合技术的发展，控制井斜的技术水平和能力也不断提高。文章对旋转钻井过程中，国内外一些具有代表性的直井防斜钻具组合，尤其是对国内近几年的最新防斜钻具结构做了概要论述，并对这些防斜钻具的优缺点进行了对比分析。同时还简要介绍了国外最先进的井斜控制闭环系统及应用情况。旨在为钻井界科技人员提供此方面的技术信息，以便在实际钻井中加以利用和选择。

关键词：直井防斜装置钻具组合综述钻井井斜