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“精益加工单元”在传统航空制造企业生产组织转型中的创新与实践应用研究

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价值工程 2024年第1期43卷 52-54页

作者：吴兴明王光书赵洋曹鹏宾航王康陕西华燕航空仪表有限公司汉中723000

本文介绍了为解决速率陀螺仪电机壳盖生产“瓶颈”问题,而建立的电机壳盖加工单元的建立过程和实践情况。同时,本文从解决管理瓶颈的角度,研究了如何构建符合自身需求的数控加工单元管控模式,从而提高数控单元的整体管理水平,实现数控... 详细信息

本文介绍了为解决速率陀螺仪电机壳盖生产“瓶颈”问题,而建立的电机壳盖加工单元的建立过程和实践情况。同时,本文从解决管理瓶颈的角度,研究了如何构建符合自身需求的数控加工单元管控模式,从而提高数控单元的整体管理水平,实现数控专业化发展新突破。同时,重点对电机壳盖的生产特点、单元建设、工艺质量管控、技术总结等几个方面进行了详细介绍。

关键词：电机壳盖单元化制造工艺与质量控制生产管理模式

Nitrogen–sulfur co-doped porous carbon derived from asphalt as efficient catalyst for oxygen reduction

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Rare Metals 2024年第1期43卷 380-388页

作者： Jing-Sheng Ma ming-Zai wu Ling Chen Li-xing Zhang Ying Xiong Key Laboratory of Structure and Functional Regulation of Hybrid Materials Ministry of EducationInstitute of EnergyHefei Comprehensive National Science CenterAnhui UniversityHefei 230601China

As an environment-friendly and low-cost petrochemical by-product, asphalt has great potential in the preparation of metal-free oxygen reduction electrocatalysts with excellent performance and outstanding stability. In this paper, we converted asphalt into porous carbon nanosheets by a simple activation method, using potassium citrate as the swelling agent.

关键词： stability porous catalyst

Laser Wire Additive Manufacturing of Ti-6Al-4V Alloy and Its Machine Learning Study for Parameters Optimization(Invited)

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中国激光 2024年第4期51卷 182-198页

作者： wu Junyi Zhang Bo Wang Weihua Li Weipeng Yao Xiyu Wang Dawei xing Wei Yan ming Department of Materials Science and Engineering Southern University of Science and TechnologyShenzhen 518055GuangdongChina Songshan Lake Materials Laboratory Dongguan 523830GuangdongChina Institute of Physics Chinese Academy of SciencesBeijing 100190China Jiaxing Research Institute Southern University of Science and TechnologyShenzhen 518055GuangdongChina High Performance Computing Department National Supercomputing CenterShenzhen 518055GuangdongChina

Ti-6Al-4V is a benchmark Ti alloy. Laser wire additive manufacturing(LWAM) offers advanced manufacturing capability to the alloy for applications possibly including exploration of outer space. As a typical multiple-variable process, LWAM is complex, which, however, can be analyzed, predicated or even optimized by artificial intelligence(AI) methods such as machine learning(ML). In this study, printing parameters of the Ti-6Al-4V is firstly optimized using single-track-single-layer experiments, and then single-track-multiple-layer samples are printed, whose properties in terms of hardness and compressive strength are analyzed subsequently by both experiments and ML. The two ML approaches, artificial neural network(ANN) and support vector machine(SVM), are employed to predict the experimental results, whose coefficients of determination R2 show good values. Further optimized properties are realized by adopting genetic algorithm(GA) and simulated annealing(SA) approaches, which contribute to high mechanical properties achieved, for instance, an engineering compressive strength of about 1694 MPa. The results here indicate that important mechanical properties of the LWAM-prepared Ti alloys can be well predicted and enhanced using suitable ML approaches.

关键词： artificial printing additive

Microstructure recognition of steels by machine learning based on visual attention mechanism

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Journal of Iron and Steel Research(International) 2024年第4期31卷 909-923页

作者： xing-yu Chen Lin Cheng Cheng-yang Hu Yu-peng Zhang Kai-ming wu The State Key Laboratory of Refractories and Metallurgy Hubei Province Key Laboratory of Systems Science on Metallurgical ProcessingInternational Research Institute for Steel TechnologyCollaborative Center on Advanced SteelsWuhan University of Science and TechnologyWuhan 430081HubeiChina Metals Valley and Band(Foshan)Metallic Composite Materials Co. Ltd.Foshan 528000GuangdongChina

U-Net has achieved good performance with the small-scale datasets through skip connections to merge the features of the low-level layers and high-level layers and has been widely utilized in biomedical image segmentation as well as recent microstructure image segregation of the *** representative visual attention mechanism modules,named as squeeze-and-excitation networks,convolutional block attention module,and extended calibration algorithm,were intro-duced into the traditional U-Net architecture to further improve the prediction *** is found that compared with the original U-Net architecture,the evaluation index of the improved U-Net architecture has been significantly improved for the microstructure segmentation of the steels with the ferrite/martensite composite microstructure and pearlite/ferrite composite microstructure and the complex martensite/austenite island/bainite microstructure,which demonstrates the advantages of the utilization of the visual attention mechanism in the microstructure *** reasons for the accuracy improvement were discussed based on the feature maps analysis.

关键词： Microstructure recognition-Steel Machine learning Visual attention mechanism Visualization

Differential bonding behaviors of sodium/potassium-ion storage in sawdust waste carbon derivatives

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Chinese Chemical Letters 2024年第4期35卷 496-501页

作者： Jun-ming Cao Kai-Yang Zhang Jia-Lin Yang Zhen-Yi Gu xing-Long wu MOE Key Laboratory for UV Light-Emitting Materials and Technology Northeast Normal UniversityChangchun 130024China Department of Chemistry Northeast Normal UniversityChangchun 130024China

Sodium-ion batteries(SIBs) and potassium-ion batteries(PIBs) are the most promising alternatives to lithium-ion batteries, and thus have drawn intensive research attention. Porous carbon materials from different precursors have been widely used as anode materials owing to their compatible storage effectiveness of both larger radii sodium and potassium ions. However, the differential bonding behaviors of Na and K ions with porous carbon-based anode are the significant one worth investigating, which could provide a clean picture of alkali ions storage mechanism. Therefore, in this work, we prepare a porous carbon network derived from sawdust(SDC) wastes, to further analyze the differences on sodium and potassium ions storage behaviors in terms of bond-forming process. It is found that, as-prepared SDC anodes could deliver stable sodium and potassium storage capacities, however, there are notable distinctions in terms of electrochemical behaviors and diffusion processes. By virtue of ex-situ XRD and Raman spectroscopy, the phase transition reaction of potassium ions could be well-observed, and the results shows that the multiple intercalated compounds was formed in SDC network during ions insertion, further resulting in slower diffusion kinetics and larger resistance compared to non-bonded process of sodium ions storage. This study provides more insights into the differences between sodium and potassium ions storage, as well as the energy storage mechanism of porous carbon as anodes for secondary batteries.

关键词： Porous carbon Sodium-ion storage Potassium-ion storage Bonding behaviors Batteries

Genome-wide development of interspecific microsatellite markers for Saccharum officinarum and Saccharum spontaneum

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Journal of Integrative Agriculture 2022年第11期21卷 3230-3244页

作者： LIU Lei WANG Heng-bo LI Yi-han CHEN Shu-qi wu ming-xing DOU Mei-jie QI Yi-yin FANG Jing-ping ZHANG Ji-sen Center for Genomics and Biotechnology Fujian Provincial Key Laboratory of Haixia Applied Plant Systems BiologyKey Laboratory of GeneticsFujian Agriculture and Forestry UniversityFuzhouFujian 350002P.R.China State Key Lab for Conservation and Utilization of Subtropical Agro-Biological Resources&Guangxi Key Lab for Sugarcane Biology Guangxi UniversityNanning 530004P.R.China College of Life Sciences Fujian Normal UniversityFuzhou 350007P.R.China

Sugarcane has a large,complex,polyploid genome that has hindered the progress of genomic research and molecular marker-assisted *** user-friendly SSR markers have attracted considerable attention owing to their ideal genetic ***,these markers were not characterized and developed at the genome-wide scale due to the previously lacking high-quality chromosome-level assembled sugarcane *** this present study,744305and 361638 candidate SSRs were identified from the genomes of *** and ***,*** verified the reliability of the predicted SSRs by using 1200 interspecific SSR primer pairs to detect polymorphisms among 11 representative accessions of Saccharum,including ***,***,***,and modern sugarcane *** results showed that 660 SSR markers displayed interspecific polymorphisms among these ***,100 SSRs were randomly selected to detect the genetic diversity for 39 representative Saccharum accessions.A total of 320 alleles were generated using 100 polymorphic primers,with each marker ranging from two to seven *** genetic diversity analysis revealed that these accessions were distributed in four main groups,including group I(14 *** accessions),group II(two *** accessions),group III(18 modern sugarcane hybrid accessions),and group IV(five *** accessions).Experimental verification supported the reliability of the SSR markers based on genome-wide *** development of a large number of SSR markers based on wet experiments is valuable for genetic studies,including genetic linkage maps,comparative genome analysis,genome-wide association studies,and marker-assisted selection in Saccharum.

关键词： Saccharum genome-wide simple repeat sequences(SSR) microsatellite molecular markers

Nano polystyrene microplastics could accumulate in Nile tilapia(Oreochromis niloticus):Negatively impacts on the intestinal and liver health through water exposure

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Journal of Environmental Sciences 2024年第3期137卷 604-614页

作者： Di wu xing Lu Li-Xue Dong Juan Tian Jin Deng Lei Wei Hua Wen Shan Zhong ming Jiang School of Basic Medical Sciences Wuhan UniversityWuhan 430071China Key Laboratory of Freshwater Biodiversity Conservation Ministry of Agriculture and Rural AffairsYangtze River Fisheries Research InstituteChinese Academy of Fishery SciencesWuhan 430223China Hubei Province Key Laboratory of Allergy and Immunology Wuhan 430071China

Microplastics(MPs)have become a significant concern for their potential ***,the correlation between the size of plastic particles and their toxicity remains ***,we investigate the toxic effects of different sizes(80 nm,800 nm,8μm and 80μm)polystyrene MPs(PS-MPs)on the model organism Nile tilapia(Oreochromis niloticus).The results of bioluminescent imaging indicate that the 80 nm PS-MPs are more likely to invade the body.H&E staining shows severe damage on the intestinal villi and distinct hepatic steatosis in the 80 nm *** U labeling shows that the proliferation activity of intestinal and liver cells reduces significantly in the 80 nm *** gut microbiome analysis shows a severe imbalance of gut microbiota homeostasis in the 80 nm *** analysis of liver transcriptomics and metabolomics shows that the liver lipid metabolism is disordered in the 80 nm *** conclusion,this study confirms that the 80 nm PS-MPs are more likely to induce intestinal and liver *** the above lay the foundation for further study on the pathological damage of MPs to other organisms.

关键词： Microplastics(MPs) Intestinal toxicity Liver toxicity Gut microbiome Lipid metabolism

甘蔗割手密种转录因子NAP亚家族的鉴定及SsNAP2a参与叶片衰老的功能分析

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作物学报 2024年第1期50卷 110-125页

作者：王恒波冯春燕张以星谢婉婕杜翠翠吴明星张积森福建农林大学农业农村部福建甘蔗生物学与遗传育种重点实验室/国家甘蔗工程技术研究中心/福建农林大学生命科学学院福建福州3500022 广西大学亚热带农业生物资源保护与利用国家重点实验室广西南宁530004

NAP(NAC-like,activated by apetala3/pistillata)是转录因子NAC基因家族中一类参与调控植物生长发育、叶片衰老及响应激素和非生物胁迫应答的亚家族。本研究利用甘蔗割手密种基因组数据和生物信息学方法,首先,基于比较基因组学对NAP亚... 详细信息

NAP(NAC-like,activated by apetala3/pistillata)是转录因子NAC基因家族中一类参与调控植物生长发育、叶片衰老及响应激素和非生物胁迫应答的亚家族。本研究利用甘蔗割手密种基因组数据和生物信息学方法,首先,基于比较基因组学对NAP亚家族成员进行鉴定、系统进化分析、保守结构域及顺式调控元件预测;其次,克隆获得割手密种SsNAP2的等位基因SsNAP2a,分析该基因在不同生长发育阶段的表达及其在激素和非生物胁迫下的表达特征;最后,利用瞬时表达和亚细胞定位分析SsNAP2a基因的功能。结果表明,在割手密种基因组中共鉴定5个NAP亚家族成员,亚细胞定位预测所有成员编码蛋白均定位于细胞核上,这些基因的Ka/Ks比值均小于1,表明纯化选择在演化中起到关键作用。系统聚类分析表明,5个代表性的被子植物(拟南芥、菠萝、水稻、玉米和高粱)与已报道的12个物种及甘蔗的NAP亚家族成员,共计46个,分为4个Clade,其演化的顺序Clade I>Clade II>Clade III>Clade IV。此外,在SsNAP亚家族成员的启动子区域预测到较多响应脱落酸和茉莉酸、低温等逆境胁迫的顺式作用元件,推测其参与多种激素和非生物胁迫相关应答通路。进一步,从割手密种SES208中克隆到SsNAP2a基因,该cDNA全长序列1173 bp(GenBank登录号为OQ335094),编码390个氨基酸残基,其与等位基因SsNAP2编码蛋白的序列相似性为97.70%,有10个氨基酸残基的差异,表明同源8倍体的割手密种等位基因序列差异较大。qRT-PCR分析表明,SsNAP2a基因在割手密种不同生长发育阶段中组成型表达,尤其在衰老的蔗皮和根中的表达量最高;在乙烯利(ethylene,ET)、脱落酸(abscisic acid,ABA)、4℃低温和40℃高温处理下,其表达量呈现显著诱导表达;而在8%聚乙二醇(polyethyleneglycol,PEG)胁迫下显著下调表达。亚细胞定位表明,SsNAP2a融合蛋白定位在细胞核上。瞬时过表达SsNAP2a基因7 d后,本氏烟(Nicotianabenthamiana)叶片有明显的卷曲、皱缩等衰老现象,ET合成相关基因(NtEFE26,NtAccdeaminase)显著上调表达,而水杨酸、茉莉酸和ABA合成相关基因(NtPR-1a/c、NtPR3和NtAREB1)显著下调表达,表明SsNAP2a基因参与多种激素信号传导途径诱发叶片衰老。以上研究结果为挖掘甘蔗NAP亚家族基因成员参与叶片衰老的生物学功能奠定了研究基础,也为培育甘蔗抗衰老分子育种提供候选的基因资源。

关键词：割手密种 NAP基因叶片衰老激素胁迫基因功能甘蔗

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Demixing microwave signals using system-on-chip photonic processor

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Light(Science & Applications) 2024年第3期13卷 399-401页

作者： Sheng Gao Chu wu xing Lin Department of Electronic Engineering Tsinghua University100084 BeijingChina Beijing National Research Center for Information Science and Technology Tsinghua University100084 BeijingChina

The integrated photonic processor,co-packaged with electronic peripherals,is proposed for blind source separation of microwave signals,which separates signal-of-interest from dynamic interference with real-time adapta... 详细信息

关键词： processor microwave mixing