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线加热实现枕型船体外板成形的弹性有限元分析

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造船技术 2017年第4期45卷 14-17,23页

作者：王江超黄文嘉常利春周宏鞠理杨刘建峰华中科技大学船舶与海洋工程学院湖北武汉430074 江苏科技大学船舶与海洋工程学院江苏镇江212003 上海外高桥造船有限公司上海200137

基于固有变形理论和弹性有限元分析,以氧-乙炔火焰加热的固有变形为输入参数,应用弹性有限元分析预测船体板材的面外变形;对比两种不同加热模式下板材受热弯曲成形的效率。研究分析表明,弹性有限元分析可高效地预测板材成形的效果,且从... 详细信息

基于固有变形理论和弹性有限元分析,以氧-乙炔火焰加热的固有变形为输入参数,应用弹性有限元分析预测船体板材的面外变形;对比两种不同加热模式下板材受热弯曲成形的效率。研究分析表明,弹性有限元分析可高效地预测板材成形的效果,且从边缘到边缘的平行线加热模式,更有利于板材的弯曲成形。

关键词：板材成形线加热固有变形弹性有限元分析

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曲面分段全建造流程的误差累积及精度预测

船舶与海洋工程 2023年第6期39卷 1-8,16页

作者：王江超陈相飞牛业兴杜仕忠孙昊赵宏权华中科技大学船舶与海洋工程学院湖北武汉430074 高新船舶与深海开发装备协同创新中心上海200240 上海振华重工启东海洋工程股份有限公司江苏南通226200 江苏海事职业技术学院船舶与海洋工程学院江苏南京211199

以海洋平台典型曲面分段为研究对象,梳理建造企业对切割和弯曲工艺的精度要求及误差响应,以及焊接工艺对应的典型接头力学载荷,并将其作为曲面分段建造的源头误差。基于弹性有限元方法,分析焊接工艺对曲面分段建造精度的影响;考虑切割... 详细信息

以海洋平台典型曲面分段为研究对象,梳理建造企业对切割和弯曲工艺的精度要求及误差响应,以及焊接工艺对应的典型接头力学载荷,并将其作为曲面分段建造的源头误差。基于弹性有限元方法,分析焊接工艺对曲面分段建造精度的影响;考虑切割和弯曲误差对焊接工艺的影响,并预测闭合加工误差的焊接工艺及其产生的焊接变形。为提升曲面分段建造精度的评估效率,建立基于遗传算法的BP(Back Propagation)人工神经网络,并以27组数据为训练样本,以9组数据为验证样本检验其预测的准确性。通过弹性有限元分析研究不考虑、保留及矫正切割和弯曲加工误差等3种情况下的曲面分段建造精度,结果发现三者存在明显差异。考虑切割、弯曲的加工误差及其焊接闭合工艺对曲面分段的建造精度的显著影响,基于遗传算法的BP人工神经网络具有极高的预测精度和稳定性。

关键词：曲面分段建造工艺误差焊接固有变形加工误差矫正遗传算法 BP人工神经网络

基于复数向量余弦相似度KNN和深度度量学习的高精度无源室内定位

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移动通信 2024年第8期48卷 77-84页

作者：何之源张志本沈琼霞巩江超王德胜华中科技大学湖北武汉430074 烽火通信科技股份有限公司湖北武汉430205

AI及深度学习的发展为未来6G实现高精度室内定位系统提供了新思路。通过分析CSI数据的物理特性,提出了一种基于复数向量余弦相似度的改进KNN算法,显著提升了无源定位的性能。进一步地,采用度量学习方法,设计了Structured Embedding Los... 详细信息

AI及深度学习的发展为未来6G实现高精度室内定位系统提供了新思路。通过分析CSI数据的物理特性,提出了一种基于复数向量余弦相似度的改进KNN算法,显著提升了无源定位的性能。进一步地,采用度量学习方法,设计了Structured Embedding Loss损失函数,并引入Softmax Structure Loss优化神经网络模型,实现了端到端的高效训练和推理。实验结果表明,这些创新方法显著提高了无源定位的精度和鲁棒性,定位准确率和Macro-F1评分分别达到99.15%和99.1%,为无源定位、无线信号处理等领域提供了新的研究视角和技术路径。

关键词：深度学习度量学习无源定位信道状态信息机器学习

木纳格葡萄沙枣复合果酒发酵工艺优化及抗氧化活性分析

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中国酿造 2024年第9期43卷 130-134页

作者：宋晶晶王月丽张亚南姜蕾侯吉超吴江超喀什大学生命与地理科学学院新疆喀什844000

该试验以木纳格葡萄和沙枣(Elaeagnus angustifolia)为原料制备木纳格葡萄沙枣复合果酒,通过单因素和正交试验对复合果酒的发酵工艺进行优化,并对复合果酒抗氧化活性进行分析。结果表明,木纳格葡萄沙枣复合果酒的最佳发酵工艺为初始糖... 详细信息

该试验以木纳格葡萄和沙枣(Elaeagnus angustifolia)为原料制备木纳格葡萄沙枣复合果酒,通过单因素和正交试验对复合果酒的发酵工艺进行优化,并对复合果酒抗氧化活性进行分析。结果表明,木纳格葡萄沙枣复合果酒的最佳发酵工艺为初始糖度24°Bx,酵母接种量0.4%,发酵时间7 d,发酵温度24℃,在此条件下发酵制得的木纳格葡萄沙枣复合果酒呈橙黄色,酒体清亮,果香浓郁,酒香醇厚,酒精度为10.3%vol,感官评分为85.2分。发酵后的复合果酒2,2'-联氮-双(3-乙基-苯并噻唑-6-磺酸)(ABTS+)、1,1-二苯基-2-三硝基苯肼(DPPH)、羟基自由基清除能力较发酵前均提高,总酚、总黄酮、黄烷-3-醇含量均显著提高(P<0.05),表明木纳格葡萄沙枣复合果酒具有一定的抗氧化活性。

关键词：木纳格葡萄沙枣复合果酒发酵工艺抗氧化活性

The vaginal and fecal microbiomes are related to pregnancy status in beef heifers

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Journal of Animal Science and Biotechnology 2020年第1期11卷 58-70页

作者： Feilong Deng Maryanna McClure Rick Rorie Xiaofan wang Jianmin Chai Xiaoyuan Wei Songjia Lai jiangchao Zhao Department of Animal Science Division of AgricultureUniversity of ArkansasFayettevilleARUSA Farm Animal Genetic Resources Exploration and Innovation Key Laboratory of Sichuan Province Sichuan Agricultural UniversityChengduChina Special Key Laboratory of Microbial Resources and Drug Development Research Center for Medicine and BiologyZunyi Medical UniversityZunyiChina.

Background:The greatest impact on profitability of a commercial beef operation is ***,in beef heifers,little is known about the vaginal and fecal microbiota with respect to their relationship with *** this end,we followed heifers through gestation to examine the dynamics of vaginal and fecal microbial composition throughout ***:Heifers were exposed to an estrus synchronization protocol,observed over a 12-day period,artificially inseminated 12 h to 18 h after observed estrus,and subsequently exposed to bulls for a 50-day breeding *** samples were taken at pre-breeding(n=72),during the first(n=72),and second trimester(n=72)for all individuals,and third trimester for individuals with confirmed pregnancies(n=56).Fecal samples were taken at prebreeding(n=32)and during the first trimester(n=32),including bred and open *** generation sequencing of the V4 region of the 16 S rRNA gene via the Illumina Mi Seq platform was applied to all *** indices and the number of observed bacterial features were the same in fecal ***,significant differences in vaginal microbiome diversity between gestation stages were *** differences in beta-diversity were detected in vaginal or fecal samples regarding pregnancy status,but such differences were seen with fecal microbiome over *** Forest was developed to identify predictors of pregnancy status in vaginal(e.g.,Histophilus,Clostridiaceae,Campylobacter)and fecal(e.g.,Bacteroidales,Dorea)***:Our study shows that bovine vaginal and fecal microbiome could be used as biomarkers of bovine *** experiments are needed to validate these biomarkers and to examine their roles in a female’s ability to establish pregnancy.

关键词： Beef cattle Pregnancy Random forest Reproduction Vaginal microbiome

Electronic Coupling of Single Atom and FePS_3 Boosts Water Electrolysis

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Energy & Environmental Materials 2022年第3期5卷 899-905页

作者： Chongyang Tang Dong He Nan Zhang Xianyin Song Shuangfeng Jia Zunjian Ke jiangchao Liu Jianbo wang Changzhong Jiang Ziyu wang Xiaoqing Huang Xiangheng Xiao School of Physics and Technology Wuhan UniversityWuhan 430072China The Key Laboratory of Synthetic and Biological Colloids Ministry of EducationSchool of Chemical and Material EngineeringJiangnan UniversityWuxi 214122China Institute of Technological Sciences Wuhan UniversityWuhan 430072China State Key Laboratory of Physical Chemistry of Solid Surfaces College of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005China

Engineering the electronic structure of surface active sites at the atomic level can be an efficient way to modulate the reactivity of ***,we report the rational tuning of surface electronic structure of FePS_(3) nanosheets(NSs)by anchoring atomically dispersed metal *** calculations predict that the strong electronic coupling effect in single-atom Ni-FePS_(3) facilitates electron aggregation from Fe atom to the nearby Ni-S bond and enhances the electron-transfer of Ni and S sites,which balances the oxygen species adsorption capacity,reinforces water adsorption and dissociation process to accelerate corresponding oxygen evolution reaction(OER)and hydrogen evolution reaction(HER).The optimal Ni-FePS_(3)NSs/C exhibits outstanding electrochemical water-splitting activities,delivering an overpotential of 287 mV at the current density of 10 mA cm^(-2) and a Tafel slope of 41.1 mV dec^(-1) for OER;as well as an overpotential decrease of 219 mV for HER compared with pure FePS_(3)NSs/*** concept of electronic coupling interaction between the substrate and implanted single active species offers an additional method for catalyst design and beyond.

关键词： electronic coupling iron thiophosphates nanosheet single atom water electrolysis

Protocatechuic acid and quercetin attenuate ETEC-caused IPEC-1 cell inflammation and injury associated with inhibition of necroptosis and pyroptosis signaling pathways

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Journal of Animal Science and Biotechnology 2023年第4期14卷 1551-1568页

作者： Kan Xiao Mohan Zhou Qingqing Lv Pengwei He Xu Qin Dan wang jiangchao Zhao Yulan Liu Hubei Key Laboratory of Animal Nutrition and Feed Science Wuhan Polytechnic UniversityWuhan 430023People’s Republic of China Department of Animal Science Division of AgricultureUniversity of ArkansasFayettevilleAR 72701USA

Background:Necroptosis and pyroptosis are newly identified forms of programmed cell death,which play a vital role in development of many gastrointestinal *** plant polyphenols have been reported to protect intestinal health,it is still unclear whether there is a beneficial role of plant polyphenols in modulating necroptosis and pyroptosis in intestinal porcine epithelial cell line(IPEC-1)infected with enterotoxigenic Escherichia coli(ETEC)*** research was conducted to explore whether plant polyphenols including protocatechuic acid(PCA)and quercetin(Que),attenuated inflammation and injury of IPEC-1 caused by ETEC K88 through regulating necroptosis and pyroptosis signaling ***:IPEC-1 cells were treated with PCA(40μmol/L)or Que(10μmol/L)in the presence or absence of ETEC ***:PCA and Que decreased ETEC K88 adhesion and endotoxin level(P<0.05)in cell *** and Que increased cell number(P<0.001)and decreased lactate dehydrogenases(LDH)activity(P<0.05)in cell supernatant after ETEC *** and Que improved transepithelial electrical resistance(TEER)(P<0.001)and reduced fluorescein isothiocyanate-labeled dextran(FD4)flux(P<0.001),and enhanced membrane protein abundance of occludin,claudin-1 and ZO-1(P<0.05),and rescued distribution of these tight junction proteins(P<0.05)after ETEC *** and Que also declined cell necrosis ratio(P<0.05).PCA and Que reduced mRNA abundance and concentration of tumor necrosis factor-α(TNF-α),interleukin(IL)-6 and IL-8(P<0.001),and down-regulated gene expression of toll-like receptors 4(TLR4)and its downstream signals(P<0.001)after ETEC *** and Que down-regulated protein abundance of total receptor interacting protein kinase 1(t-RIP1),phosphorylated-RIP1(p-RIP1),p-RIP1/t-RIP1,t-RIP3,p-RIP3,mixed lineage kinase domain-like protein(MLKL),p-MLKL,dynamin-related protein 1(DRP1),phosphoglycerate mutase 5(PGAM5)and high mobility group box 1(HMGB1)(P<0.05)after ETEC infection.M

关键词： Cell damage ETEC K88 Intestinal inflammation Necroptosis Protocatechuic acid Pyroptosis Quercetin

Oxygen Vacancy-induced Electron Density Tuning of Fe_(3)O_(4) for Enhanced Oxygen Evolution Catalysis

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Energy & Environmental Materials 2021年第3期4卷 392-398页

作者： Lulu Gao Chongyang Tang jiangchao Liu Lanli He Hongbo wang Zunjian Ke Wenqing Li Changzhong Jiang Dong He Li Cheng Xiangheng Xiao Department of Physics Hubei Nuclear Solid Physics Key Laboratory and Su Zhou InstituteWuhan UniversityWuhan 430072China

Despite the tremendous efforts devoted to enhancing the activity of oxygen evolution reaction(OER)catalysts,there is still a huge challenge to deeply understand the electronic structure characteristics of transition metal oxide to guide the design of more active ***,Fe_(3)O_(4)with oxygen vacancies(Fe_(3)O_(4)-Vac)was synthesized via Ar ion irradiation method and its OER activity was greatly improved by properly modulating the electron density around Fe *** electron density of Fe_(3)O_(4)-Vac around Fe atoms increased compared to that of Fe_(3)O_(4)according to the characterization of synchrotron-based X-ray absorption near-edge structure(XANES),extended X-ray absorption fine structure(EXAFS)spectra,and density functional theory(DFT)***,the DFT results indicate the enhancement of the desorption of HOO^(*)groups which significantly reduced the OER reaction ***_(3)O_(4)-Vac catalyst shows an overpotential of 353 m V,lower than that of Fe OOH(853 m V)and Fe_(3)O_(4)(415 m V)at 10 m A cm^(-2),and a low Tafel slope of 50 m V dec^(-1)in 1 M KOH,which was even better than commercial RuO_(2)at high *** modulation approach provides us with valuable insights for exploring efficient and robust water-splitting electrocatalysts.

关键词： electron density ion irradiation oxygen evolution reaction oxygen vacancy

Oxygen vacancies and V co-doped Co_(3)O_(4) prepared by ion implantation boosts oxygen evolution catalysis

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Chinese Physics B 2021年第10期30卷 73-78页

作者： Bo Sun Dong He Hongbo wang jiangchao Liu Zunjian Ke Li Cheng Xiangheng Xiao Department of Physics Hubei Nuclear Solid Physics Key LaboratoryWuhan UniversityWuhan 430072China

Introducing heteroatoms and defects is a significant strategy to improve oxygen evolution reaction(OER)performance of ***,the synergistic interaction of the heteroatom and defect still needs further ***,we demonstrated an oxygen vacancy-rich vanadium-doped Co_(3)O_(4)(V-Ov-Co_(3)O_(4)),fabricated by V-ion implantation,could be used for high-efficient OER catalysis.X-ray photoelectron spectra(XPS)and density functional theory(DFT)calculations show that the charge density of Co atom increased,and the reaction barrier of reaction pathway from O∗to HOO∗decreased.V-Ov-Co_(3)O_(4) catalyst shows a low overpotential of 329 mV to maintain current density of 10 mA·cm^(−2),and a small Tafel slope of 74.5 mV·dec^(−1).This modification provides us with valuable perception for future design of heteroatom-doped and defect-based electrocatalysts.

关键词： ion implantation oxygen vacancy oxygen evolution reaction heteroatom doping