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SiCp粒径级配对55%SiCp/6061Al复合材料组织和性能的影响

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东北大学学报（自然科学版） 2024年第6期45卷 802-807页

作者：王梦奇刘越肖春林刘春明东北大学材料科学与工程学院辽宁沈阳110819 东北大学材料各向异性与织构教育部重点实验室辽宁沈阳110819 辽宁蓝煜新材料有限公司辽宁铁岭112606

采用真空热压法制备了55%SiCp/6061Al(55%为体积分数)复合材料,研究SiCp粒径级配对复合材料SiCp分布均匀度、致密度和抗弯强度的影响.研究结果表明:粒径级配复合材料组织致密、SiCp分布均匀且SiCp与6061Al合金基体界面结合强度高.双粒径... 详细信息

采用真空热压法制备了55%SiCp/6061Al(55%为体积分数)复合材料,研究SiCp粒径级配对复合材料SiCp分布均匀度、致密度和抗弯强度的影响.研究结果表明:粒径级配复合材料组织致密、SiCp分布均匀且SiCp与6061Al合金基体界面结合强度高.双粒径(60+25)μm、质量比4∶1复合材料热处理后抗弯强度由395 MPa提高为548 MPa;三粒径级配为(120+60+25)μm、质量比为1∶1∶1的复合材料热处理前抗弯强度最高,为397 MPa;双粒径级配(106+25)μm、质量比4∶1的复合材料致密度>99.0%、均匀度>90.00%、热处理后抗弯强度>400MPa,具有优异的综合性能.

关键词： 55%SiCp/6061Al复合材料真空热压粒径级配均匀度致密度抗弯强度

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背栓式干挂瓷板幕墙施工技术应用

佛山陶瓷 2024年第3期34卷 69-71页

作者：刘春明甘肃第三建设集团有限公司兰州730000

本文通过实际工程项目,在安装技术上进行了大胆改进和创新:一是经过计算,将龙骨与预埋件、主次龙骨间螺栓连接改为焊接,由此保证了瓷板的表面平直度和安装质量,达到了连接强度高、生产效率高的优点;二是将横龙骨翻转置于立柱外,加大内... 详细信息

本文通过实际工程项目,在安装技术上进行了大胆改进和创新:一是经过计算,将龙骨与预埋件、主次龙骨间螺栓连接改为焊接,由此保证了瓷板的表面平直度和安装质量,达到了连接强度高、生产效率高的优点;二是将横龙骨翻转置于立柱外,加大内部空间,方便操作人员手伸入内部操作。最终总结出背栓式干挂瓷板幕墙施工方法,经工程实践应用证明,该施工方法安装简便。操作简便、生产效率高、施工质量和外观质量能够得到有效保证,具有一定的经济效益和社会效益。

关键词：背栓式干挂瓷板幕墙施工技术

新质生产力助推共同富裕:内在机理、战略重点与路径选择

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汉江师范学院学报 2024年第4期44卷 102-110页

作者：刘纯明余慧重庆理工大学马克思主义学院重庆400054

新质生产力能够切实助推共同富裕。就内在机理而言,新质生产力有利于提升经济增长质量、优化收入分配格局、促进区域协调发展以及推动社会公平正义,助力共同富裕的实现。就战略重点而言,新质生产力助推共同富裕必须坚持党的集中统一领... 详细信息

新质生产力能够切实助推共同富裕。就内在机理而言,新质生产力有利于提升经济增长质量、优化收入分配格局、促进区域协调发展以及推动社会公平正义,助力共同富裕的实现。就战略重点而言,新质生产力助推共同富裕必须坚持党的集中统一领导、发展战略性新兴产业、发展现代服务业并促进绿色生产与可持续发展。基于此,在路径选择上应侧重于:坚持创新驱动发展,培育新质生产力;把握现实机遇,推进数字化转型升级;优化产业结构,提升产业链价值;完善制度保障,促进社会公平正义。

关键词：新质生产力共同富裕内在机理战略重点路径选择

2008,a Year for Plants to Celebrate

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Journal of Integrative Plant Biology 2008年第7期50卷 769-770页

作者： liu, Dong liu, chun-ming Tsinghua Univ Beijing 100084 Peoples R China Chinese Acad Sci Inst Bot Beijing Peoples R China

2008 is a special year for the Botanical Society of China (BSC)for two reasons. The first one is for the 75th anniversary of the Society, and the second one is for Prof. Zhengyi Wu who received The State Supreme Science and Technology Award,the country’s highest science honor. This special issue, with a collection of 16 articles, is dedicated to these events.

关键词： a Year for Plants to Celebrate BSC Chen

Effect of Frontier Orbital on Aggregation Behavior of Barbituric Acid Derivatives

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Chemical Research in Chinese Universities 2002年第4期18卷 441-444页

作者： liu chun-ming YANG Wen-sheng Department of Chemistry Changchun Teachers’ColleageChangchun 130023P.R.China College of Chemistry Jilin UniversityChangchun 130023P.R.China

Two amphiphilic barbituric acid derivatives with a D-π-A structure, 5-(4-dodecyloxybenzylidene)-(1H,3H)-2,4,6-pyrimidinetrione(PB_ 12) and 5-(4-N,N-didodecylaminobenzylidene)-(1H,3H)-2,4,6-pyrimidintrione(AB_ 12) were found to show different aggregation behavior in chloroform. PB_ 12, a derivative with weak electron donating and strong electron drawing substituents, tends to aggregate in a head-to-tail manner, whereas AB_ 12, a derivative with both strong electron donating and drawing substituents, tends to aggregate in a face-to-face manner at a higher concentration. The cyclic voltammograms of AB_ 12 and PB_ 12 show that their energy levels of LUMO approach each other, however, the energy level of HOMO of AB_ 12 is much higher than that of PB_ 12.

关键词： Barbituric acid derivative Aggregation HOMO LUMO

EGCG对奶牛子宫内膜炎致病菌抗菌作用及网络药理学的研究

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中国预防兽医学报 2024年第4期46卷 411-417页

作者：张泽辉吴运谱崔子寅梁喜才王杏王春田刘明春辽宁中医药大学实验动物医学院辽宁沈阳110847 沈阳农业大学动物科学与医学学院辽宁沈阳110866

为探究表没食子儿茶素没食子酸酯(EGCG)对细菌性奶牛子宫内膜炎的治疗作用机制,本研究采用微量肉汤稀释法测定EGCG对4种牛子宫内膜炎致病菌(金黄色葡萄球菌、化脓隐秘杆菌、大肠杆菌和铜绿假单胞菌)标准株的最小抑菌浓度(MIC)、最小杀... 详细信息

为探究表没食子儿茶素没食子酸酯(EGCG)对细菌性奶牛子宫内膜炎的治疗作用机制,本研究采用微量肉汤稀释法测定EGCG对4种牛子宫内膜炎致病菌(金黄色葡萄球菌、化脓隐秘杆菌、大肠杆菌和铜绿假单胞菌)标准株的最小抑菌浓度(MIC)、最小杀菌浓度(MBC),将各菌液稀释100倍后,采用微量结晶紫法测定EGCG对各菌的最小生物被膜(BF)抑制浓度(MBIC);基于网络药理学分析并筛选EGCG治疗奶牛子宫内膜炎的核心靶点,并进行基因本体(GO)和京都基因与基因组百科全书(KEGG)信号通路的富集分析,采用AutoDock Tool软件进行EGCG与核心靶点的分子对接验证。结果显示:EGCG对4种子宫内膜炎相关致病菌均有一定的抗菌活性,其中对革兰氏阳性菌的抗菌作用较强;EGCG在1 MIC~2 MIC的浓度范围内均能有效抑制4株标准株BF的形成。通过网络药理学筛选出肿瘤坏死因子(TNF)和基质金属蛋白酶9 (MMP9)等为EGCG治疗子宫内膜炎的核心靶点;GO分析结果显示含胶原的细胞外基质通路可能是EGCG治疗子宫内膜炎的主要通路之一;KEGG富集分析显示转化生长因子-β (TGF-β)、分泌抵抗、雌激素等信号通路在EGCG治疗奶牛子宫内膜炎的机制中发挥关键作用;分子对接验证试验结果显示EGCG可与上述核心靶点稳定结合。上述结果表明EGCG对4种奶牛子宫内膜炎致病菌表现出抗菌活性和抑制其BF形成的作用,初步揭示了EGCG治疗奶牛子宫内膜炎的可能作用靶点及其作用机制,本研究为EGCG在奶牛生产中的临床应用提供了科学依据。

关键词：奶牛子宫内膜炎致病菌 EGCG 网络药理学信号通路

Precipitation Kinetics of Cr_2N in High Nitrogen Austenitic Stainless Steel

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Journal of Iron and Steel Research International 2008年第6期15卷 72-77页

作者： SHI Feng WANG Li-jun CUI Wen-fang liu chun-ming School of Materials and Metallurgy Northeastern University Shenyang 110004 Liaoning China

The precipitation behavior of Cr2 N during isothermal aging in the temperature range from 700 ℃ to 950 ℃ in Fe-18Cr-12Mn-0.48N （in mass percent） high nitrogen austenitic stainless steel, including morphology and content of precipitate, was investigated using optical microscopy, scanning electron microscopy, and transmission electron microscopy. The isothermal precipitation kinetics curve of Cr2 N and the corresponding precipitation activation energy were obtained. The results show that Cr2N phase precipitates in a cellular way and its morphology is transformed from initial granular precipitates to lamellar ones in the cell with increasing aging time. The nose temperature of Cr2 N precipitation is about 800 ℃, with a corresponding incubation period of 30 min, and the ceiling temperature of Cr2N precipitation is 950℃. The diffusionactivation energy of Cr2 N precipitation is 296 kJ/mol.

关键词： high nitrogen austenitic stainless steel isothermal aging precipitation kinetics precipitation activation energy

Supercritical Fluid Extraction of Total Flavonoids from Leaves of Acanthopanax Senticosus Harms

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Chemical Research in Chinese Universities 2007年第2期23卷 233-236页

作者： liu chun-ming ZHAO Ji-min LI Hong-mei SONG Feng-rui Department of Chemistry Changchun Normal University Changchun 130032 P. R. China Changchun Institute of Applied Chemistry Chinese Academy of SciencesChangchun 130022 P. R. China

The herbal plant Acanthopanax Senticosus Harms is natural herb of Changbaishan in Jilin Province of China, which belongs to the Araliaceae family. As the ingredients of folk medicine, it has long been used to treat a variety of human diseases, such as cerebrovascular disease, diabetes, tumor, isochemic heart diseases, hypertension, rheumatic arthritis, etc. E2,33. Flavonoids, a class of constituent compounds, which have a broad distribution in the nature and are found in Acanthopanax Senticosus Harms, have gained particular attention. A number of studies have shown that flavonoid compounds have wide biological activities, such as anti-aging, anticancer, anti-HIV,

关键词： Supercritical fluid extraction(SFE) Acarahopanax Senticosus Harms Flavonoids

Preconcentration of Rare Earth Elements with 8-Hydroxyquinoline-5-sulfonic Acid Chelated Cellulose Filter Prior to Determination by Inductively Coupled Plasma Atomic Emission Spectrometry

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Chemical Research in Chinese Universities 2000年第3期16卷 208-212页

作者： liu chun ming GAO Xiu qing DU Yao guo GUO Yi hang Department of Chemistry Changchun Normal CollegeChangchun 130032P.R.China Department of Environment Sciences Jilin UniversityChangchun 130023P.R.China

Hydroxyquinoline 5 sulfonic acid, covalently bound to filter cellulose, was used for preconcentrating trace rare earth element(REE) ions from complex matrices and matrix separation, respectively. Multi REE ions were preconcentrated on the column filled with 8 hydroxyquinoline 5 sulfonic acid cellulose filter and analysed by ICP AES after being eluted with dilute HNO 3. In the given pH range, alkali and alkaline earth metal ions can be separated as matrix elements; a high concentration factor is obtained and the eluates can be measured without interference. The usefulness of the method is shown by the control analyses of standard reference materials. [WT5FZ]

关键词： Hydroxyquinoline 5 sulfonic acid cellulose filter Preconcentration REE ICP AES