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Effect of Build Direction on Fatigue Performance of L-PBF 316L Stainless Steel

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Acta Metallurgica Sinica(English Letters) 2020年第4期33卷 539-550页

作者： Chenfan Yu Yuan Zhong Peng Zhang Zhenjun Zhang congcong zhao Zhefeng Zhang Zhijian Shen Wei Liu State Key Laboratory of New Ceramic and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China Department of Materials and Environmental Chemistry Arrhenius LaboratoryStockholm University10691 StockholmSweden Laboratory of Fatigue and Fracture for Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China

The microstructure and fatigue and tensile properties of 316 L stainless steel fabricated via laser powder bed fusion(L-PBF)were *** 316 L stainless steel specimens with different loading directions which are either perpendicular to or parallel to building direction were prepared by L-PBF *** results of X-ray diffraction tomography showed that there was no significant difference in morphology and size/distribution of the defects in the HB and VB *** long axis of columnar grains is generally parallel to the build direction,the fatigue crack encounters more grain boundaries in VB samples under cyclic loading,which led to enhanced fatigue resistance of VB samples compared with HB *** contrast to HB sample,the VB sample has a higher fatigue strength due to a higher resistance to localized plastic deformation under cyclic *** differences in fatigue properties of L-PBF 316 L SS with different build directions were predominantly controlled by solidification microstructures.

关键词： Austenitic stainless steel Laser powder bed fusion Tensile properties Fatigue strength

The Mechanism of Cube Texture Formation in Ni-7 at%W Substrate

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Journal of Wuhan University of Technology(Materials Science) 2024年第5期39卷 1260-1269页

作者： zhao congcong SUO Hongli JI Yaotang GAO Mangmang MA Lin LIU Min School of Materials Science and Engineering Beijing University of TechnologyBeijing 100124China College of Materials and New Energy Ningxia UniversityYinchuan 750021China

In order to obtain the sharp cube texture,a new process,the intermediate annealing rolling technique,has been introduced to prepare the Ni7W *** this paper,a cubic texture content up to 98.5%within 10°of the standard cubic orientation is obtained in the final substrate and the influence of this improved rolling technique on the cube texture formation has been *** results show that the increased cube texture in the Ni7W substrate is caused by the optimized deformation texture and the increased nucleated fraction of the cube grains.

关键词： cube texture coated conductor deformation texture recrystallization

Potential roles of the rectum keystone microbiota in modulating the microbial community and growth performance in goat model

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Journal of Animal Science and Biotechnology 2023年第5期14卷 2048-2062页

作者： Dangdang Wang Guangfu Tang Lichao zhao Mengya Wang Luyu Chen congcong zhao Ziqi Liang Jie Chen Yangchun Cao Junhu Yao College of Animal Science and Technology Northwest A&F UniversityYangling 712100ShaanxiChina

Background Ruminal microbiota in early life plays critical roles in the life-time health and productivity of ruminant ***,understanding of the relationship between gut microbiota and ruminant phenotypes is very ***,the relationship between the rectum microbiota,their primary metabolites,and growth rate of a total of 76 young dairy goats(6-month-old)were analyzed,and then 10 goats with the highest or lowest growth rates respectively were further compared for the differences in the rectum microbiota,metabolites,and animal’s immune parameters,to investigate the potential mechanisms by which the rectum microbiota contributes to the health and growth *** The analysis of Spearman correlation and microbial co-occurrence network indicated that some keystone rectum microbiota,including unclassified Prevotellaceae,Faecalibacterium and Succinivibrio,were the key modulators to shape the rectum microbiota and closely correlated with the rectum SCFA production and serum IgG,which contribute to the health and growth rate of young *** addition,random forest machine learning analysis suggested that six bacterial taxa in feces could be used as potential biomarkers for differentiating high or low growth rate goats,with 98.3%accuracy of ***,the rectum microbiota played more important roles in gut fermentation in early life(6-month-old)than in adulthood stage(19-month-old)of *** We concluded that the rectum microbiota was associated with the health and growth rate of young goats,and can be a focus on the design of the early-life gut microbial intervention.

关键词： Early life Goat Growth performance Rectum microbiota SCFA

Review of Restoration Technology and Multi-environmental Factors Analysis of West Lake Ecosystem in Hangzhou City

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Journal of Northeast Agricultural University(English Edition) 2022年第3期29卷 37-47页

作者： Wang Xin zhao congcong Liu Yang School of Art and Design Zhejiang Sci-Tech UniversityHangzhou 310018China

The urban lake ecosystem has the characteristics of long-term,complex and comprehensive in its ecological restoration process because it is related to social and economic activities at multiple *** in Hangzhou City,China,the West Lake is a national-level scenic spot and a world heritage cultural *** provides key ecosystem services for the city and has a significant impact on the urban ecological environment and the well-being of *** West Lake has undergone an 1800-year governance process in history,realizing the harmonious coexistence with Hangzhou *** modern times,due to the rapid development of urbanization and industrialization,the water quality of the West Lake and its freshwater ecosystem have been greatly *** 2002,Hangzhou City has achieved the overall restoration of the West Lake ecosystem through a series of measures,such as water diversion projects,dredging projects,and the West Lake comprehensive protection project,and the water environment and lakeshore landscape have been greatly *** study analyzed the restoration technology of the West Lake ecosystem from two scales of the watershed and the site and discussed the water ecological governance system of the West Lake in the past 20 *** thedata analyses of the West Lake land use,vegetation,TP,TN,NH_(3)-N,COD_(Mn) and other multi-environmental factors,the results showed that the water quality,transparency and eutrophication of the West Lake had been greatly *** the same time,the application of large-scale restoration methods and technologies also required long-term observation,and attention should be paid to the proliferation of alien species and the loss of heritage value,so as to further avoid potential ecological risks caused by ecological restoration.

关键词： urban lake aquatic ecosystem ecological restoration technology comprehensive environmental protection project

Yak rumen microbiome elevates fiber degradation ability and alters rumen fermentation pattern to increase feed efficiency

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Animal Nutrition 2022年第4期11卷 201-214页

作者： congcong zhao Lamei Wang Shanlin Ke Xinhua Chen Akos Kenez Wei Xu Dangdang Wang Fan Zhang Yong Li Zhanhong Cui Yu Qiao Jing Wang Wenjuan Sun Jianhua zhao Junhu Yao Zhongtang Yu Yangchun Cao College of Animal Science and Technology Northwest A&F UniversityYanglingShaanxiChina Division of Gastroenterology Department of MedicineBeth Israel Deaconess Medical CenterHarvard Medical SchoolBostonMAUSA Channing Division of Network Medicine Brigham and Women's Hospital and Harvard Medical SchoolBostonMAUSA Department of Infectious Diseases and Public Health City University of Hong KongKowloonHong KongChina Qinghai Academy of Animal Husbandry and Veterinary Sciences Qinghai UniversityXiningQinghaiChina Department Animal Engineering Yangling Vocational&Technical CollegeYanglingShaanxiChina Shanghai Majorbio Bio-pharm Technology Co. Ltd.ShanghaiChina Department of Animal Sciences The Ohio State UniversityColumbusOHUnited States

Rumen microbes play an important role in ruminant energy supply and animal *** studies showed that yak(Bos grunniens)rumen microbiome and fermentation differ from other ***,little is understood about the features of the rumen microbiome that make yak adapted to their unique environmental and dietary *** study was to investigate the rumen microbiome and metabolome to understand how yak adapt to the coarse forage and harsh environment in the Qinghai-Tibetan *** female Qaidam yellow cattle(Bos taurus),9 dzomo(hybrids of cattle and yak)and 9 female plateau yak(***),about 5 to 6 years old,were used in this *** fermentation parameters,fibrolytic enzyme activities,and rumen metataxonomic were *** 18(6 samples per group)were selected for rumen metagenomic and metabolome *** analysis revealed that the rumen microbiota was significantly different among plateau yak,Qaidam yellow cattle,and dzomo(P<0.05).Metagenomic analysis displayed a larger gene pool encoding a richer repertoire of carbohydrate-active enzymes in the rumen microbiome of plateau yak and dzomo than Qaidam yellow cattle(P<0.05).Some of the genes encoding glycoside hydrolases that mediate the digestion of cellulose and hemicellulose were significantly enriched in the rumen of plateau yak than Qaidam yellow cattle,but glycoside hydrolase 57 that primarily includes amylases was abundant in Qaidam yellow cattle(P<0.05).The rumen fermentation profile differed also,Qaidam yellow cattle having a higher molar proportion of acetate but a lower molar proportion of propionate than dzomo and plateau yak(P<0.05).Based on metabolomic analysis,rumen microbial metabolic pathways and metabolites were *** metabolites are mainly amino acids,carboxylic acids,sugars,and bile *** in rumen microbial composition could explain the above *** present study showed that the rumen microbiome of plateau yak h

关键词： High plateau ruminant Rumen microbiome Metagenome Metabolome

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钨选区激光熔化应力场的数值模拟

稀有金属材料与工程 2024年第2期53卷 490-500页

作者：周木华赵聪聪季华实验室广东佛山528200

建立了将随温度变化的材料参数特性和相变潜热考虑在内,用“生死单元”技术模拟铺粉过程的钨选区激光熔化热力耦合有限元模型,模拟了选区激光熔化过程中成形件的温度场和应力场,探究了不同基板预热温度和不同支撑结构对成形件残余应力... 详细信息

建立了将随温度变化的材料参数特性和相变潜热考虑在内,用“生死单元”技术模拟铺粉过程的钨选区激光熔化热力耦合有限元模型,模拟了选区激光熔化过程中成形件的温度场和应力场,探究了不同基板预热温度和不同支撑结构对成形件残余应力的影响。模拟结果表明,金属钨在选区激光熔化过程中经历多次加热、冷却过程,温度分布不均匀。基板预热和施加支撑结构均能减小成形件的残余应力,当基板预热温度为1273.15 K时,成形件中间节点残余应力减小118.99MPa,减小幅度为9.96%;当采用4层网格支撑结构时,成形件中间节点残余应力减小413.33MPa,减小幅度为34.61%。

关键词：选区激光熔化数值模拟残余应力基板预热支撑结构

新时代美丽中国建设的理论缘起与实现理路——基于马克思主义生态观视角

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中共天津市委党校学报 2019年第1期21卷 40-48页

作者：赵聪聪中共中央党校研究生院马克思主义学院

马克思主义生态观蕴含着丰富而深刻的对自然生态问题的关注:人与自然的辩证统一、自然与社会的有机协调、生态危机根源的探究、人与自然和解途径的探索。这些生态思想历久弥新,为新时代美丽中国建设提供了理论源泉与方法论基础。新时代... 详细信息

马克思主义生态观蕴含着丰富而深刻的对自然生态问题的关注:人与自然的辩证统一、自然与社会的有机协调、生态危机根源的探究、人与自然和解途径的探索。这些生态思想历久弥新,为新时代美丽中国建设提供了理论源泉与方法论基础。新时代美丽中国建设着眼于"美丽"的生态维度,在准确把握马克思主义生态观思想精髓的基础上,确立了自然美、社会美、人美的科学理论体系。面对当前日益严峻的生态环境危机,马克思主义生态观为实现新时代美丽中国建设提供了许多有益启发:培养合理开发利用自然的生态意识,全面推进可持续发展,促进科学技术创新,建立最严格的生态保护制度。

关键词：新时代美丽中国建设马克思主义生态观

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中国共产党坚持胸怀天下的四维审视

长白学刊 2023年第6期 9-17页

作者：赵聪聪北京工业大学马克思主义学院北京100024

坚持胸怀天下是中国共产党百年奋斗的重要历史经验,也是习近平新时代中国特色社会主义思想的重要世界观与方法论。中国共产党坚持胸怀天下源自深厚的马克思主义理论精髓和中华优秀传统文化内在逻辑,熔铸于百年党史为人民谋幸福、为民族... 详细信息

坚持胸怀天下是中国共产党百年奋斗的重要历史经验,也是习近平新时代中国特色社会主义思想的重要世界观与方法论。中国共产党坚持胸怀天下源自深厚的马克思主义理论精髓和中华优秀传统文化内在逻辑,熔铸于百年党史为人民谋幸福、为民族谋复兴、为人类谋进步、为世界谋大同的奋斗实践。构建人类命运共同体是中国共产党坚持胸怀天下在新时代的重要内容和集中体现,为解决人类面临的共同问题贡献了中国智慧、中国方案。中国共产党坚持胸怀天下具有重大而深远的世界价值意义。坚持胸怀天下是中华民族现代文明之精神特质,引领了人类文明发展新趋势,开拓了中国式现代化新路向,彰显了中国共产党世界担当的政党文明逻辑,为创造人类文明新形态作出了突出贡献,提供了重要启示。

关键词：胸怀天下人类命运共同体中华民族现代文明人类文明新形态

“中国特色大国外交和推动构建人类命运共同体”教学设计

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思想政治教育研究 2024年第6期40卷 163-168页

作者：赵聪聪北京工业大学马克思主义学院北京100124

一、选题:教材内容与学情分析1.教材内容分析中国特色大国外交是新时代中国外交工作的重要体现,推动构建人类命运共同体是新时代中国特色大国外交的总目标,在这一宏大目标指引下,中国外交不断进行理念创新与实践探索,开创了中国特色大... 详细信息

一、选题:教材内容与学情分析1.教材内容分析中国特色大国外交是新时代中国外交工作的重要体现,推动构建人类命运共同体是新时代中国特色大国外交的总目标,在这一宏大目标指引下,中国外交不断进行理念创新与实践探索,开创了中国特色大国外交新局面。

关键词：学情分析中国特色大国外交人类命运共同体教学设计目标指引教材内容分析创新与实践探索推动