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Tunable and efficient microwave absorption from mesophase pitch carbide with designable electromagnetic properties

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Defence Technology（防务技术） 2023年第10期28卷 222-235页

作者： Junyu Lu Haoruo Zhang Yang Chen Mushan Yuan Mei Liang Zhengguang Heng huawei zou The State Key Lab of Polymer Materials Engineering Polymer Research Institute of Sichuan UniversityChengdu 610065China School of New Energy and Materials Engineering Southwest Petroleum UniversityChengdu 610500China

In order to obtain the microwave absorption(MA)materials with light weight,high efficiency and tunable properties,the carbonized mesophase pitch(CMP)with the variation in carbonization temperatures and particle sizes were prepared and *** carbonization temperature mainly controlled the graphitization degree of the CMP to affect their conductive *** carbon residues were generated on the CMP surface when the temperature was higher than 700℃,which contributed significantly to the polarization loss of the *** scale regulation,the segregation between the particles in the paraffin ring caused by the reduction particles of CMP carbonization at 750℃(750 CMP)resulted in a significant reduction in conductive losses while improving their impedance *** 750 CMP over 300 mesh sieved had the strongest MA properties of-53 d B at 3.4 GHz within 5.5 ***,the prepared CMPs were multi-layer compounded and optimized by CST microwave *** synergistic effect derived from the improved impedance matching and the enhanced interfacial polarization resulted in significant reflection loss in multi-layer ***,these findings lead to the systematically regulation of carbon-based materials for MA,showing an attractive application prospect for the preparation of high-performance MA materials.

关键词： Microwave absorption Mesophase pitch Broadband Dielectric loss Interfacial polarization

Simultaneously enhanced heat dissipation and tribological properties of polyphenylene sulfide-based composites via constructing segregated network structure

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Journal of Materials Science & Technology 2022年第4期99卷 239-250页

作者： You Shi Yang Bai Yanzhou Lei Haoruo Zhang Shengtai Zhou huawei zou Mei Liang Yang Chen The State Key Laboratory of Polymer Materials Engineering Polymer Research Institute of Sichuan UniversityChengdu 610065China

Self-lubricating polyphenylene sulfide(PPS)composites were fabricated by constructing a segregated network structure using the co-deposition *** carboxyl-functionalized multi-walled carbon nanotubes(CNTs)and silicon carbide(SiC)were successfully coated on the surface of PPS powders with the aid of self-polymerization of dopamine(PDA)and co-polymerization between PDA and polyethyleneimine(PEI),thereby forming PPS@PDA-CNTs-SiC hierarchical reinforcing *** showed that the thermal conductivity of PPS@PDA-CNTs-SiC(0.97 W/(m K))is about 120%higher than that of PPS/CNTs/*** friction coefficient(0.193)and specific wear rate(2.50×10^(-5)mm^(3)/(N m))of PPS@PDA-CNTs-SiC are 18.9%and 50%lower than those of PPS/CNTs/SiC,*** enhanced thermal conductivity of PPS@PDA-CNTs-SiC contributes to rapid dissipation of frictional heat at the sliding interface which protects the polymer substrate from being destroyed or peeled,thereby improving the tribological *** work provides new insights into expanding the application of self-lubricating polymer composites in the fields where efficient heat dissipation is also a primary concern.

关键词： Polyphenylene sulfide Segregated network Thermal conductivity Self-lubricating polymer composites Transfer film

Dietary supplementation of yeast cell wall improves the gastrointestinal development of weaned calves

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Animal Nutrition 2020年第4期6卷 507-512页

作者： Jian Ma Ali M.Shah Yaqun Shao Zhisheng Wang huawei zou Kun Kang Low Carbon Breeding Cattle and Safety Production University Key Laboratory of Sichuan Province Animal Nutrition InstituteSichuan Agricultural UniversityChengdu 611130China Angel Yeast Co. Ltd.Yichang 443000China

The purpose of this study was to investigate the potential benefits of yeast cell wall(YCW)on the gastrointestinal development of weaned *** healthy Holstein male calves(BW=92±8.29 kg and 60±5 d of age)were randomly allocated into 2 groups:CON with no YCW,and YCW(accounted for0.16%of the basal diet).The dietary concentrate-to-roughage ratio was 40:*** the calves were fed regularly twice a day at 09:00 and 16:00 and had free access to *** experiment lasted for 60 *** results showed that calves fed YCW showed higher(P<0.05)length,width,and surface area of papillae in the ventral sac of the rumen as compared to *** the dorsal sac of the rumen,the muscularis thickness was thicker(P<0.05)in the YCW group when compared with CON *** villus height of YCW calves was higher(P<0.05)than that of CON in the *** supplemented with YCW also showed a higher(P<0.05)villus height-to-crypt depth ratio in the *** YCW calves exhibited a greater(P<0.05)thickness of the wall in the duodenum and *** supplemented with YCW improved(P<0.05)the claudin 1 mRNA expression in the ileum and occludin mRNA expression in the jejunum and *** YCW increased(P<0.05)the contents of secretory immunoglobulin A in the jejunum and ileum of *** conclusion,dietary supplementation with YCW could improve the gastrointestinal development of weaned calves.

关键词： Weaned calf Yeast cell wall Ruminal histology Intestinal histology Intestinal barrier function Gastrointestinal development

Active dry yeast supplementation improves the growth performance,rumen fermentation, and immune response of weaned beef calves

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Animal Nutrition 2021年第4期7卷 1352-1359页

作者： Jian Ma Cheng Wang Zhisheng Wang Guang Cao Rui Hu Xueying Wang huawei zou Kun Kang Quanhui Peng Bai Xue Lizhi Wang Yueming Zhu Xiaopeng Zhu Low Carbon Breeding Cattle and Safety Production University Key Laboratory of Sichuan Province Animal Nutrition InstituteSichuan Agricultural UniversityChengdu 611130China Angel Yeast Co. Ltd.Yichang 443000China Zhangye Comprehensive Experimental Station of National Yak and Beef Industrial Technology System Zhangye 734000China

The objective of this experiment was to investigate the potential benefits of active dry yeast(ADY)on the growth performance,rumen fermentation,nutrient digestibility,and serum parameters of weaned beef *** Simmental crossbred male calves(body weight=86.47±4.41 kg and 70±4 d of age)were randomly divided into 2 groups:control(CON)(fed basal ration)and ADY(fed basal ration and 5 g/d ADY per calf).The dietary concentrate-to-roughage ratio was 35:*** the calves were regularly provided rations 3 times a day at 07:00,13:00,and 19:00 and had free access to wate *** experiment lasted for 60 *** average daily gain of ADY group was higher(P=0.007)than that of the CON group,and the ratio of feed intake to average daily gain in the ADY group was reduced(P=0.022)as compared to the CON *** concentration of ruminal ammonia-N was higher(P=0.023)in the CON group than that in the ADY group,but an opposite trend of microbial protein was found between the 2 ***,the ruminal concentrations of propionate and butyrate were higher(P<0.05)in the ADY group than those in the CON *** fed ADY exhibited higher(P<0.05)crude protein and neutral detergent fiber *** of ADY increased(P<0.05)the contents of glucose,glutathione peroxidase,superoxide dismutase,immunoglobulin A,immunoglobulin M,and interleukin 10 in the serum of calves,but an opposite trend was observed in malondialdehyde,interleukin 1 beta,and tumor necrosis factor alpha contents between the 2 *** conclusion,dietary supplementation with ADY could improve the growth performance,rumen fermentation,nutrient digestibility,antioxidant ability,and immune response of weaned beef calves.

关键词： Active dry yeast Weaned beef calf Growth performance Rumen fermentation Nutrient digestibility Immune response

异嗜性和多变性逆转录病毒受体1在乳头状甲状腺癌患者中表达的意义

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浙江大学学报（医学版） 2021年第1期50卷 90-96页

作者：邹华伟项承河南省周口市中心医院甲状腺乳腺外科河南周口466000 浙江大学医学院附属第二医院甲状腺外科浙江杭州310009

目的:探索异嗜性和多变性逆转录病毒受体1(XPR1)基因在乳头状甲状腺癌(PTC)患者中表达的价值及其参与PTC发生发展的潜在通路。方法:通过HPA数据库和UALCAN数据库探索XPR1在PTC组织及正常组织中的表达水平;通过cBioPortal数据库获取PTC... 详细信息

目的:探索异嗜性和多变性逆转录病毒受体1(XPR1)基因在乳头状甲状腺癌(PTC)患者中表达的价值及其参与PTC发生发展的潜在通路。方法:通过HPA数据库和UALCAN数据库探索XPR1在PTC组织及正常组织中的表达水平;通过cBioPortal数据库获取PTC患者临床资料及XPR1基因表达值,探索XPR1表达水平与患者性别、年龄、PTC分型、T分期、N分期、M分期和疾病分期的相关性;Cox回归分析探索PTC患者预后的影响因素;利用cBioPortal数据库探索XPR1基因组学改变;基因本体(GO)和京都基因与基因组百科全书(KEGG)分析探索XPR1参与PTC的生物学途径。结果:HPA数据库分析发现,与正常组织相比,XPR1在PTC组织中表达增加;UALCAN数据库分析发现,XPR1基因表达量在PTC组织中较正常组织明显增多(P0.05)。回归分析结果显示,XPR1表达水平可作为PTC患者预后的独立影响因子(HR=2.894,P<0.05)。cBioPortal数据库显示,6%的PTC患者出现XPR1基因突变,主要表现为错义突变,突变位点为蛋白结构域E615K。富集分析结果显示,XPR1可能通过参与调节代谢通路影响PTC发生发展。结论:XPR1在PTC组织中表达增加,且影响患者预后,可能通过参与代谢通路影响PTC的发生发展,可作为PTC诊断和治疗的潜在靶点。

关键词：乳头状甲状腺癌异嗜性和多变性逆转录病毒受体1 预后富集分析生物信息学分析

尼龙6/可膨胀石墨/Al_2O_3导热绝缘复合材料的制备与性能

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高分子材料科学与工程 2018年第9期34卷 120-125页

作者：李瑶陈洋邹华维梁梅四川大学高分子研究所高分子材料工程国家重点实验室四川成都610065

低温可膨胀石墨(LTEG)呈二维片层状,具有优良的导热导电性,可以作为导热填料提高高分子材料的导热性能。文中将Al_2O_3与LTEG复配,与尼龙6(PA6)树脂复合,制备了导热复合材料。实验控制LTEG的用量低于其导电逾渗阈值,保证最终材料的体积... 详细信息

低温可膨胀石墨(LTEG)呈二维片层状,具有优良的导热导电性,可以作为导热填料提高高分子材料的导热性能。文中将Al_2O_3与LTEG复配,与尼龙6(PA6)树脂复合,制备了导热复合材料。实验控制LTEG的用量低于其导电逾渗阈值,保证最终材料的体积电阻率在较高水平。熔融挤出过程中,LTEG原位膨胀、剥离形成石墨微片,石墨微片起到"桥梁"作用,与Al_2O_3粒子相互搭接,促进导热通路的形成,明显提高了材料的热导率。试样EA5/60 (5%LTEG+60%Al_2O_3)的热导率达到2. 019 W/(m·K),比纯PA6热导率提高了596. 2%。引入石墨微片使复合材料的体积电阻率降低2~3个数量级,保持在10^(12)~10^(13)Ω·cm。

关键词：尼龙6 可膨胀石墨氧化铝导热性能电绝缘

基于监测、流行病学和结果数据库的胸腺神经内分泌肿瘤患者临床特征及预后分析

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肿瘤研究与临床 2019年第3期31卷 176-179页

作者：徐歌瀚邹华伟中国医科大学第二临床学院沈阳110122 中国医科大学附属盛京医院第一肿瘤科沈阳110023

目的探讨胸腺神经内分泌肿瘤(NETT)的临床特征及潜在的预后因素。方法选取美国国立癌症研究所监测、流行病学和结果(SEER)数据库2007年1月至2014年12月收录经病理确诊的NETT患者的临床资料进行回顾性研究。Cox比例风险模型分析影响预后... 详细信息

目的探讨胸腺神经内分泌肿瘤(NETT)的临床特征及潜在的预后因素。方法选取美国国立癌症研究所监测、流行病学和结果(SEER)数据库2007年1月至2014年12月收录经病理确诊的NETT患者的临床资料进行回顾性研究。Cox比例风险模型分析影响预后的相关因素。结果139例NETT患者的中位诊断年龄为59岁,年龄(58±17)岁。男性95例,女性44例,男女比例为2.2∶1。中位总生存时间为90个月。单因素分析显示,肿瘤分期(P=0.001)、肿瘤分级(P=0.001)、是否手术(P=0.003)与患者预后相关。多因素分析表明,肿瘤分级是影响患者预后的独立因素(HR:5.70;95%CI1.75~18.58;P=0.004)。结论NETT是一种罕见的侵袭性强的恶性肿瘤,肿瘤分级是影响患者预后的独立危险因素,高分化者预后好于低分化者。

关键词：神经内分泌肿瘤胸腺预后分级

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双峰分布聚乙烯的动态流变行为

高分子材料科学与工程 2011年第6期27卷 60-63页

作者：陈洋邹华维刘鹏波罗文洲高分子材料工程国家重点实验室四川大学高分子研究所四川成都610065

以六种不同分子量分布特征的聚乙烯为研究对象,通过动态流变、高压毛细管流变以及凝胶渗透色谱(GPC)等分析测试手段,对这六种聚乙烯的结构和性能进行对比分析。高压毛细管的结果表明,A样品表现出更好加工稳定性和更宽的加工速率窗口,结... 详细信息

以六种不同分子量分布特征的聚乙烯为研究对象,通过动态流变、高压毛细管流变以及凝胶渗透色谱(GPC)等分析测试手段,对这六种聚乙烯的结构和性能进行对比分析。高压毛细管的结果表明,A样品表现出更好加工稳定性和更宽的加工速率窗口,结合该样品的分子量及分子量分布特别是动态流变行为,笔者认为,样品中高低分子量部分的微相分布状态对体系系带分子的形成及材料的应用性能具有重要影响,从而为双峰分布聚乙烯的核心结构的表征和性能预测提供快速有效的方法。

关键词：双峰分布聚乙烯动态流变微相分布表征

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扩链聚乳酸的超临界CO_2发泡与结晶

高分子材料科学与工程 2019年第3期35卷 131-135页

作者：余智吴东森邹华维刘鹏波高分子材料工程国家重点实验室四川大学高分子研究所四川成都610065

采用超临界CO_2釜式发泡,通过快速降压对扩链聚乳酸进行发泡。采用差示扫描量热仪、广角X射线衍射分析仪、扫描电子显微镜及图像分析系统研究了饱和压力与饱和时间对扩链聚乳酸发泡及结晶行为的影响。研究结果表明,经过超临界CO_2釜式发... 详细信息

采用超临界CO_2釜式发泡,通过快速降压对扩链聚乳酸进行发泡。采用差示扫描量热仪、广角X射线衍射分析仪、扫描电子显微镜及图像分析系统研究了饱和压力与饱和时间对扩链聚乳酸发泡及结晶行为的影响。研究结果表明,经过超临界CO_2釜式发泡,扩链聚乳酸由无定形态转变为半结晶态。扩链聚乳酸在115℃、18 MPa下,采用超临界CO_2饱和2 h后快速卸压发泡,制得的聚乳酸泡沫的发泡倍率为28倍,泡孔平均孔径为57μm,结晶度为32.8%,泡孔为均匀的闭孔结构。

关键词：聚乳酸发泡超临界CO2 结晶