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片石混凝土挡土墙在生态廊道建设中的应用

江西建材 2024年第4期 261-262,276页

作者：吴鑫元中铁二十四局集团福建铁路建设有限公司福建福州350011

文中以湖北省秭归县茅坪河流域综合治理生态廊道建设工程为例,研究了生态廊道建设中挡土墙施工技术,总结了该项目中块石与混凝土的原材料控制要点,并从技术参数、施工流程、片石基础施工、片石墙身施工、泄水孔设置、沉降缝设置、裂缝... 详细信息

文中以湖北省秭归县茅坪河流域综合治理生态廊道建设工程为例,研究了生态廊道建设中挡土墙施工技术,总结了该项目中块石与混凝土的原材料控制要点,并从技术参数、施工流程、片石基础施工、片石墙身施工、泄水孔设置、沉降缝设置、裂缝控制七个环节对片石混凝土挡土墙施工技术进行分析。结果表明,其施工效果较好,可为类似项目提供参考。

关键词：综合治理生态廊道挡土墙裂缝控制

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公路路基工程挡土墙施工技术研究

江西建材 2024年第5期 255-257页

作者：吴鑫元中铁二十四局集团福建铁路建设有限公司福建福州350011

文中以湖北省秭归县茅坪河流域综合治理生态廊道建设工程为例,重点研究了公路路基工程挡土墙施工技术,总结了工程中块石与混凝土的原材料控制要点,并从技术要求及参数、施工流程、片石基础施工、片石墙身施工、泄水孔设置、沉降缝设置... 详细信息

文中以湖北省秭归县茅坪河流域综合治理生态廊道建设工程为例,重点研究了公路路基工程挡土墙施工技术,总结了工程中块石与混凝土的原材料控制要点,并从技术要求及参数、施工流程、片石基础施工、片石墙身施工、泄水孔设置、沉降缝设置、裂缝控制七个环节对施工技术展开分析,通过对挡土墙的质量检验,确定其施工效果较好,可为类似项目提供参考。

关键词：路基工程挡土墙施工技术裂缝控制

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基于主成分分析的冰温气调包装对松露的品质指标及相关性影响

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食品科学 2024年第5期45卷 257-264页

作者：戴雅谭兴怡李翔伍一有黄博吴新源王建辉刘达玉成都大学食品与生物工程学院四川成都610106 成都大学国家食物营养教育示范基地四川成都610106 成都运荔枝科技有限公司四川成都610041

目的:探究冰温技术结合O_(2)/CO_(2)气调包装技术对松露贮藏期间相关品质指标的影响。方法:以松露为原料,分别在-(4.4±0.2)℃的冰温条件下(CK组)和冰温结合40%O_(2)+60%CO_(2)气调条件下(A组)进行贮藏,测定其贮藏期间各项品质指标的变... 详细信息

目的:探究冰温技术结合O_(2)/CO_(2)气调包装技术对松露贮藏期间相关品质指标的影响。方法:以松露为原料,分别在-(4.4±0.2)℃的冰温条件下(CK组)和冰温结合40%O_(2)+60%CO_(2)气调条件下(A组)进行贮藏,测定其贮藏期间各项品质指标的变化。采用主成分分析和正交偏最小二乘判别分析建立判别模型。结果:经两种贮藏方式的松露各项指标呈现出不同的变化规律。A组松露保鲜效果明显优于单一的冰温贮藏,能够有效减少水分流失和腐烂现象,在贮藏第20天时,A组松露水分质量分数、腐烂率和质量损失率分别为63.62%、6.94%和1.02%,前者显著高于同时期的冰温对照组(P<0.05),后两者比CK组低(P<0.05)。A组能更好地维持松露品质的稳定,在保持硬度和弹性等质构特性及延缓多糖、总多酚、总黄酮、粗蛋白含量、铁离子还原能力下降方面都有较好效果。在贮藏第20天时,A组多糖、总多酚、总黄酮、粗蛋白含量、铁离子还原能力值与0?d相比时分别降低了27.94%、32.51%、16.18%、68.58%、18.13%,降幅均低于CK组。通过相关性分析和构建判别模型,能够有效区分样品在两种不同处理下的品质差异,说明在贮藏期间理化指标对松露的品质存在一定的影响;正交偏最小二乘判别分析能有效区分不同处理的组分。结论:A组包装对新鲜松露有更好的贮藏保鲜效果,本研究为松露保鲜技术开发提供理论参考。

关键词：松露冰温技术气调包装相关性分析正交偏最小二乘判别分析

LONG-TIME OSCILLATORY ENERGY CONSERVATION OF TOTAL ENERGY-PRESERVING METHODS FOR HIGHLY OSCILLATORY HAMILTONIAN SYSTEMS

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Journal of Computational Mathematics 2022年第1期40卷 70-88页

作者： Bin Wang xinyuan wu School of Mathematics and Statistics Xi’an Jiaotong UniversityXi’an 710049China Department of Mathematics Nanjing UniversityNanjing 210093China School of Mathematical Sciences Qufu Normal UniversityQufu 273165China

For an integrator when applied to a highly oscillatory system,the near conservation of the oscillatory energy over long times is an important *** this paper,we study the long-time near conservation of oscillatory energy for the adapted average vector field(AAVF)method when applied to highly oscillatory Hamiltonian *** AAVF method is an extension of the average vector field method and preserves the total energy of highly oscillatory Hamiltonian systems *** paper is devoted to analysing another important property of AAVF method,i.e.,the near conservation of its oscillatory energy in a long *** long-time oscillatory energy conservation is obtained via constructing a modulated Fourier expansion of the AAVF method and deriving an almost invariant of the expansion.A similar result of the method in the multi-frequency case is also presented in this paper.

关键词： Highly oscillatory Hamiltonian systems Modulated Fourier expansion AAVF method Energy-preserving methods Long-time oscillatory Energy conservation

HIGH-ORDER SYMPLECTIC AND SYMMETRIC COMPOSITION METHODS FOR MULTI-FREQUENCY AND MULTI-DIMENSIONAL OSCILLATORY HAMILTONIAN SYSTEMS

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Journal of Computational Mathematics 2015年第4期33卷 356-378页

作者： Kai Liu xinyuan wu Department of Mathematics Nanjing University and State Key Laboratory for Novel Software Technology at Nanjing University Nanjing 210093 P.R. China

The multi-frequency and multi-dimensional adapted Runge-Kutta^NystrSm （ARKN） integrators, and multi-frequency and multi-dimensional extended Runge-Kutta-NystrSm （ERKN） integrators have been developed to efficiently solve multi-frequency oscillatory Hamiltonian systems. The aim of this paper is to analyze and derive high-order sym- plectic and symmetric composition methods based on the ARKN integrators and ERKN integrators. We first consider the symplecticity conditions for the multi-frequency and multi-dimensional ARKN integrators. We then analyze the symplecticity of the adjoint in- tegrators of the multi-frequency and multi^dimensional symplectic ARKN integrators and ERKN integrators, respectively. On the basis of the theoretical analysis and by using the idea of composition methods, we derive and propose four new high-order symplectic and symmetric methods for the multi-frequency oscillatory Hamiltonian systems. The numer- ical results accompanied in this paper quantitatively show the advantage and efficiency of the proposed high-order symplectic and symmetric methods.

关键词： Symplectic and symmetric composition methods Multi-frequency and multi-dimensional ERKN integrators ARKN integrators Multi-frequency oscillatory Hamiltonian systems.

新型凝胶蛋白泡沫灭火材料制备及性能比较研究

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粘接 2024年第8期51卷 72-75页

作者：张明霞吴欣远西安培华学院陕西西安710125 中央民族大学北京100081

本研究制备了2种新型的凝胶蛋白泡沫。系统地分析了凝胶蛋白泡沫的微观结构、发泡性能、稳定性和保水能力,筛选出3种最佳配方,然后与商用成膜氟蛋白泡沫(FFFP)进行了灭火和回燃性能的对比测试。试验结果表明,灭火效率最好的凝胶蛋白泡沫... 详细信息

本研究制备了2种新型的凝胶蛋白泡沫。系统地分析了凝胶蛋白泡沫的微观结构、发泡性能、稳定性和保水能力,筛选出3种最佳配方,然后与商用成膜氟蛋白泡沫(FFFP)进行了灭火和回燃性能的对比测试。试验结果表明,灭火效率最好的凝胶蛋白泡沫是SA/CaCl_(2)比为9∶1,浓度为0.1%的配方。其平均泡径和水分损失率分别为128.06μm和33.64%,而FFFP的平均泡径和水分损失率分别为268.72μm和46.37%。灭火试验还证实了这种凝胶蛋白泡沫具有最佳的冷却和回燃性能,其90%回燃时间比FFFP增加了55.65%。本文为进一步研制凝胶泡沫灭火剂用于扑灭油罐火灾提供了重要的数据参考。

关键词：凝胶蛋白泡沫泡沫性能阻燃性能防回燃性能

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“E骨”-反肩置换术一站式术前规划系统

南方医科大学学报 2024年第5期44卷 967-973页

作者：李穆米昀沈世文吴心远严静东陈滨曹蕾南方医科大学南方医院信息中心广东广州510515 南方医科大学南方医院骨科-创伤骨科广东广州510515 南方医科大学生物医学工程学院//广东省医学图像处理重点实验室//广东省医学成像与诊断技术工程实验室广东广州510515 南方医科大学第一临床医学院广东广州510515 南京大学医学院附属金陵医院(东部战区总医院)骨科江苏南京210002

目的为提高反肩置换术术前规划的精准度和效率,本研究开发了“E骨”—反肩置换术一站式术前规划系统。方法利用nnU-net深度神经网络进行肩胛骨分割,获得精确的肩胛骨分割结果;结合骨密度、上下倾角和入钉长度3个关键因素自动定位基座,... 详细信息

目的为提高反肩置换术术前规划的精准度和效率,本研究开发了“E骨”—反肩置换术一站式术前规划系统。方法利用nnU-net深度神经网络进行肩胛骨分割,获得精确的肩胛骨分割结果;结合骨密度、上下倾角和入钉长度3个关键因素自动定位基座,并计算出手术规划所需定量参数;结合关节盂形态和基座定位信息生成个性化导板;编写系统界面,将各部分功能模块化组装便于使用,提供交互操作与规划结果显示的功能。结果构建出“E骨”术前规划系统。本系统与Mimics系统相比,减少了规划过程中繁琐的手动调整,平均入钉长度规划结果长于Mimics系统,且规划时间缩短86%。本系统肩胛骨分割精度达到99.93%,较Mimics更高。结论本研究为反肩置换术提供了一套一站式的高效、精准的术前规划方案,具有广泛的临床应用前景。

关键词：一站式反肩置换术术前规划系统肩胛骨分割基座定位

EXPONENTIAL FOURIER COLLOCATION METHODS FOR SOLVING FIRST-ORDER DIFFERENTIAL EQUATIONS

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Journal of Computational Mathematics 2017年第6期35卷 711-736页

作者： Bin Wang xinyuan wu Fanwei Meng Yonglei Fang School of Mathematical Sciences Qufu Normal University Qufu 273165 China Department of Mathematics Nanjing University Nanjing 210093 China School of Mathematics and Statistics Zaozhuang University Zaozhuang 277160 China

In this paper, a novel class of exponential Fourier collocation methods （EFCMs） is presented for solving systems of first-order ordinary differential equations. These so-called exponential Fourier collocation methods are based on the variation-of-constants formula, incorporating a local Fourier expansion of the underlying problem with collocation meth- ods. We discuss in detail the connections of EFCMs with trigonometric Fourier colloca- tion methods （TFCMs）, the well-known Hamiltonian Boundary Value Methods （HBVMs）, Gauss methods and Radau IIA methods. It turns out that the novel EFCMs are an es- sential extension of these existing methods. We also analyse the accuracy in preserving the quadratic invariants and the Hamiltonian energy when the underlying system is a Hamiltonian system. Other properties of EFCMs including the order of approximations and the convergence of fixed-point iterations are investigated as well. The analysis given in this paper proves further that EFCMs can achieve arbitrarily high order in a routine manner which allows us to construct higher-order methods for solving systems of first- order ordinary differential equations conveniently. We also derive a practical fourth-order EFCM denoted by EFCM（2,2） as an illustrative example. The numerical experiments using EFCM（2,2） are implemented in comparison with an existing fourth-order HBVM, an energy-preserving collocation method and a fourth-order exponential integrator in the literature. The numerical results demonstrate the remarkable efficiency and robustness of the novel EFCM（2,2）.

关键词： First-order differential equations Exponential Fourier collocation methods,Variation-of-constants formula Structure-preserving exponential integrators Collocation methods.

Design and high-strength origin of novel (CoFeNi)_(80)Ti_(5)V_(15) medium entropy alloy with “fcc + L1_(2) ”structure

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Journal of Materials Science & Technology 2023年第18期149卷 154-160页

作者： Lei Wang xinyuan wu Yuan wu Gang Liu Zhenhua Han Yunpeng Zhang Yanning Su Shengfeng Kang Jun Shen Guojun Zhang School of Materials Science and Engineering Xi’an University of TechnologyXi’an 710048China State Key Laboratory for Advanced Metals and Materials University of Science and Technology BeijingBeijing 100083China State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi’an 710072China

*** The multi-component high entropy alloys(HEAs)or medium entropy alloys(MEAs)attract reseachers’extensive attention,in particular,the single-face center cubic(fcc)HEAs or MEAs due to their some advantages,such as excellent ductility[1,2],good corrosion resistance[3]and high radiation tolerance[4].However,their strength is commonly insufficient for engineering ***,many investigations are ongoing to improve their strength by traditional strengthening mechanisms,like fine-grained strengthening[5,6],solid strengthening[6-8],strain strengthening[9],polyphase strengthening[10-12],and precipitation strength-ening[13-15].Among these strengthening mechanisms,the co-herent L1_(2)-type nanoparticles precipitation strengthening has been proven to be a very effective way to improve their strength[13-15].

关键词： strengthening strength alloy