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Misorientation characteristics and textural changes induced by dense twins in high-purity Ti sheet after small strain rolling

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Science China(Technological Sciences) 2019年第11期62卷 1968-1975页

作者： DAI JiaHong ZENG LingGuo LI ZhiJun CHAI LinJiang ZHENG ZhiYing wu Hao MURTY KL GUO Ning College of Materials Science and Engineering Yangtze Normal UniversityChongqing 408100China Chongqing Yufeng Wire and Cable Co. LtdChongqing 402260China College of Materials Science and Engineering Chongqing University of TechnologyChongqing 400054China Department of Nuclear Engineering North Carolina State UniversityRaleigh NC 27695-7909USA Faculty of Materials and Energy Southwest UniversityChongqing 400715China

A high-purity Ti(hp-Ti)sheet was subjected to small strain rolling(10%reduction)with microstructural and textural characteristics examined by electron channeling contrast imaging and electron backscatter diffraction *** attentions were paid to misorientation and textural changes aroused by twins in the rolled hp-Ti *** show that after the 10%rolling,almost all the prior equiaxed grains in the initial specimen are twinned,leading to remarkable grain *** presence of two major misorientation angle peaks around 65°and 85°is ascribed to{11-22}and{10-12}twinning,respectively,and two minor peaks around 47°and 77°are due mainly to impingement of various variants of such *** from earlier work,the small strain rolling is confirmed to be able to induce drastic textural changes in pure Ti sheets:largely reduced texture intensity and appearance of new textural *** can essentially be attributed to enhanced twinning activity due to much lower impurity contents of the present ***{11?22}twins are mainly responsible for the new textural component of c-axes aligned near the rolling direction with spread,while the component of caxes parallel to the normal direction is due to reorientation of secondary{10-12}*** study clearly demonstrates the capability of small strain rolling to effectively modify both microstructures and textures of the hp?Ti sheet and may shed some light on exploring feasible processings for such materials.

关键词： titanium sheet cold rolling misorientation twinning texture

Basement of the South China Sea Area:Tracing the Tethyan Realm

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Acta Geologica Sinica(English Edition) 2011年第3期85卷 637-655页

作者： LIU Hailing ZHENG Hongbo WANG Yanlin LIN Qiujin wu Chaohua ZHAO Meisong DU Yunkong Key Laboratory of Marginal Sea Geology South China Sea Institute of Oceanology Chinese Academy of Sciences Guangzhou 510301 China

The basement of the South China Sea（SCS）and adjacent areas can be divided into six divisions（regions）-Paleozoic Erathem graben-faulted basement division in Beibu Gulf,Paleozoic Erathem strike-slip pull-apart in Yinggehai waters,Paleozoic Erathem faulted-depression in eastern Hainan,Paleozoic Erathem rifted in northern Xisha（Paracel）,Paleozoic Erathem strike-slip extending in southern Xisha,and Paleozoic-Mesozoic Erathem extending in Nansha Islands（Spratly）*** Pre-Cenozoic basement in the SCS and Yunkai continental area are coeval within the Tethyan tectonic domain in the Pre-Cenozoic *** are formed on the background of the Paleo-Tethyan tectonic domain,and are important components of the Eastern Tethyan multi-island-ocean *** branches of the Eastern Paleo-Tethys tectonic domain,North Yunkai,North Hainan,and South Hainan sea basins,have evolved into the North Yunkai,North Hainan,and South Hainan suture zones, *** shows a distinctive feature of localization for the Pre-Cenozoic *** Qiongnan（*** Hainan）Suture Zone on the northern margin of the South China Sea can be considered the vestige of the principal ocean basin of Paleo-Tethys,and connected with the suture zone of the Longmucuo-Shuanghu belt-Bitu belt-Changning-Menglian-Bentong-Raub belt,the south extension of Bitu-Changning-Menglian-Ching Mai belt-Chanthaburi-Raub-Bentong belt on the west of South China Sea,and with the Lianhua-Taidong suture zone（a fault along the east side of Longitudinal Valley in Taiwan）-Hida LP/HT（low pressure-high temperature）metamorphic belt-Hida -marginal hp/LT metamorphic belt in southwestern Honshu of Japan,on the east of the South China *** Qiongbei（North Hainan）suture zone may eastwards extended along the Wangwu-Wenjiao fault zone,and connects with the Lufeng-Dapu-Zhenghe-Shangyu（Lianhuashan）deep fault zone through the Pearl River Mouth *** Meso-Tethys developed on the south of the South China *** Nansha Trough may be

关键词： Pre-Cenozoic basement East Tethys tectonic domain Tethyan sutures tectonic framework tectonic evolution South China Sea

初始组织对FGH4096高温合金锻造组织及室温拉伸性能的影响

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郑州航空工业管理学院学报 2024年第4期42卷 53-58,105页

作者：吴冠华孙德建杨梦伟高阳高前程郑州航空工业管理学院材料学院河南郑州450046 郑州航空工业管理学院河南省航空材料与应用技术重点实验室河南郑州450046

粉末冶金高温合金是航空发动机热端部件用关键材料,通常采用烧结—锻造工艺制备成形,烧结态样品组织(以下简称初始组织)对锻造过程中的组织演化及锻后样品力学性能具有重要影响。基于此,本文采用热压烧结(hp)技术制备了高、低原始颗粒边... 详细信息

粉末冶金高温合金是航空发动机热端部件用关键材料,通常采用烧结—锻造工艺制备成形,烧结态样品组织(以下简称初始组织)对锻造过程中的组织演化及锻后样品力学性能具有重要影响。基于此,本文采用热压烧结(hp)技术制备了高、低原始颗粒边界(PPBs)缺陷等级的两种样品,研究了不同初始组织经热锻处理后的微观组织和力学性能。实验结果表明,高PPBs缺陷等级的样品经热锻处理后,其缺陷等级明显降低,室温拉伸抗拉强度和延伸率由1220±74MPa和18.1±3.6%增加至1402±3MPa和26.8±1.5%,性能显著提升且趋于稳定,断裂模式由沿颗粒断裂变为穿颗粒断裂。低PPBs缺陷等级的样品经热锻处理后,其缺陷等级略有降低,室温拉伸抗拉强度和延伸率由1209±27MPa和18.8±1.0%增加至1249±3MPa和24.9±1.5%,拉伸性能略有提升,断裂模式由沿颗粒断裂变为沿颗粒+穿颗粒混合断裂。

关键词：高温合金粉末冶金晶粒尺寸原始颗粒边界 γ'相拉伸性能

高剂量二联疗法首次根除幽门螺杆菌疗效和安全性Meta分析

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医学研究杂志 2024年第2期53卷 74-80页

作者：霍鲁月吴胜男庄帅帅孙为豪南京医科大学第一附属医院老年消化科 210029

目的系统评价高剂量二联疗法(high-dose dual therapy,HDDT)与四联疗法(quadruple therapy,QT)对比治疗首次幽门螺杆菌(helicobacter pylori,hp)感染的疗效和安全性。方法检索中国知网、万方数据知识服务平台、维普网、CBM、PubMed、Emb... 详细信息

目的系统评价高剂量二联疗法(high-dose dual therapy,HDDT)与四联疗法(quadruple therapy,QT)对比治疗首次幽门螺杆菌(helicobacter pylori,hp)感染的疗效和安全性。方法检索中国知网、万方数据知识服务平台、维普网、CBM、PubMed、Embase、Cochrane Library等数据库,收集关于HDDT对比QT治疗hp感染的随机对照试验(randomized controlled trial,RCT),检索时间从建库至2022年7月3日。采用RevMan 5.4和Stata 17.0软件进行Meta分析。结果共纳入11篇文献,4015例患者。Meta分析结果显示,在意向性治疗分析中,HDDT根除率优于QT,且差异有统计学意义(RR=1.04,95%CI:1.01~1.06,Ρhp感染的疗效优于QT,且安全性更好,可作为一线治疗方案应用于临床。

关键词：幽门螺杆菌高剂量二联疗法四联首次

High fidelity numerical simulations on the unsteady flow field of low-pressure turbine cascades with and without upstream disturbance at moderate Reynolds number

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Advances in Aerodynamics 2022年第1期4卷 203-217页

作者： Hongbo Zhu Xiyuan Pang Feng wu Chunxiao Zhang Yan Bao Hui Xu School of Naval Architecture Ocean and Civil EngineeringShanghai Jiao Tong UniversityShanghai200240China AECC Sichuan Gas Turbine Establishment Mianyang621000China Inner Mongolia Road and Bridge Group Co. LtdHuhhot010000China School of Aeronautics and Astronautics Shanghai Jiao Tong UniversityShanghai200240China

This paper numerically investigates the aerodynamic performance of the T106A low-pressure turbine based with different inflow conditions at moderate Reynolds number by using high performance computing based on high order unstructured *** different inflow conditions respectively of uniform and disturbed are considered,while for the latter a small circular cylinder is placed upstream of the cascade to generate wake turbulence as a long-standing disturbance.A high order Fourier-spectral/hp element method is employed to solve the flow dynamics in the cascade of high complex *** transition characteristics are quantified in terms of the distribution of cascade wall surface pressure and friction coefficient,the distribution of wake profile pressure loss and the evolution characteristics of boundary layer flow structures as *** numerical results show that the current numerical simulations accurately predict the flow transition performance of low-pressure turbine cascades and capture the effects of wake-generated disturbance on the cascade,which is shown to effectively modify the flow transition performance as compared with the uniform inflow case.

关键词： Fourier-spectral/hp element method Low pressure turbine Wake generated disturbance Aerodynamic characteristics

The Novel PRRSV Strain HBap4-2018 with a Unique Recombinant Pattern Is Highly Pathogenic to Piglets

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Virologica Sinica 2021年第6期36卷 1611-1625页

作者： Pengfei Chen Xiangmei Tan Mengqin Lao Xia wu Xiongwei Zhao Shuting Zhou Jiarong Yu Junrui Zhu Lingxue Yu wu Tong Fei Gao Hai Yu Changlong Liu Yifeng Jiang Guangzhi Tong Yanjun Zhou Department of Swine Infectious Diseases Shanghai Veterinary Research InstituteChinese Academy of Agricultural SciencesShanghai200241China Shanghai Key Laboratory of Veterinary Biotechnology School of Agriculture and BiologyShanghai Jiao Tong UniversityShanghai200240China Jiangsu Co-Innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses Yangzhou UniversityYangzhou225009China

Currently, various porcine reproductive and respiratory syndrome virus(PRRSV) variants emerged worldwide with different genetic characteristics and pathogenicity, increasing the difficulty of PRRS control. In this study, a PRRSV strain named HBap4-2018 was isolated from swine herds suffering severe respiratory disease with high morbidity in Hebei Province of China in 2018. The genome of HBap4-2018 is 15,003 nucleotides in length, and compared with NADC30-like PRRSV, nsp2 of HBap4-2018 has an additional continuous deletion of five amino acids. Phylogenetic analysis based on complete genome and ORF5 showed that HBap4-2018 belonged to lineage 8 of PRRSV-2, which was characterized by highly variable genome. However, HBap4-2018 was classified into lineage 1 based on phylogenetic analysis of nsp2,sharing higher amino acid homology(85.3%–85.5%) with NADC30-like PRRSV. Further analysis suggested that HBap4-2018 was a novel natural recombinant PRRSV with three recombinant fragments in the genome, of which highly pathogenic PRRSV(hp-PRRSV) served as the major parental strains, while NADC30-like PRRSV served as the minor parental strains. Five recombination break points were identified in nsp2, nsp3, nsp5, nsp9 and ORF6, respectively,presenting a novel recombinant pattern in the genome. Piglets inoculated with HBap4-2018 presented typical clinical signs with a mortality rate of 60%. High levels of viremia and obvious macroscopic and histopathological lesions in the lungs were observed, revealing the high pathogenicity of HBap4-2018 in piglets.

关键词： Porcine reproductive and respiratory syndrome virus(PRRSV) Genetic variation Nsp2 Recombination Pathogenicity

SECOND-ORDER NONLINEAR OPTICAL HYPERBRANCHED POLYMER CONTAINING ISOLATION CHROMOPHORE MOIETIES DERIVED FROM BOTH “H”-TYPE AND STAR-TYPE CHROMOPHORES

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Chinese Journal of Polymer Science 2013年第10期31卷 1415-1423页

作者： Wen-bo wu Ying-jie Fu Can Wang Zhen Xu Cheng Ye Jin-gui Qin Zhen Li Department of Chemistry Hubei Key Lab on Organic and Polymeric Opto-Electronic MaterialsWuhan University Key Laboratory of Organic Solids Institute of Chemistry Chinese Academy of Sciences

An NLO hyperbranched polymer （hp1） derived from both ＂H＂-type and star-type chromophores was synthesized successfully for the first time with high yield via one-pot ＂A2 ＋ B3＂ Suzuki polymerization reaction. Isolation chromophore was also introduced to further improve its performance. Although under the test conditions, the films of hp1 could not be poled completely, it still demonstrated satisfactory macroscopic NLO effect with the second harmonic generation （SHG） coefficient d33 value of 36 pm/V.

关键词： Hyperbranched polymer NLO Isolation chromophore "H"-type chromophore Star-type chromophore.

Rumen-protected lysine supplementation improved amino acid balance,nitrogen utilization and altered hindgut microbiota of dairy cows

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Animal Nutrition 2023年第4期15卷 320-331页

作者： Xiaoshi Wei Hao wu Zixiang Wang Jinpeng Zhu Weijie Wang Junhong Wang Yanming Wang Chong Wang College of Animal Science and Technology&College of Veterinary Medicine Zhejiang A&F UniversityHangzhouZhejiang 311300China College of Animal Science Zhejiang UniversityHangzhou 310058China Kemin(China)Technologies Co.Ltd. Zhuhai 519040China

This study was conducted to evaluate the effects of dietary crude protein(CP)and rumen-protected lysine(RPL)supplementation on lactation performance,amino acid(AA)balance,nitrogen(N)utilization and hindgut microbiota in dairy *** were in a 2×2 factorial arrangement,and the main effects were CP concentration(16%vs.18%)and RPL supplementation(with or without RPL at40 g/cow per day).Forty cows were randomly allocated to 4 groups:low-CP diet(LP),low-CP diet plus RPL(LPL),high-CP diet(hp),high-CP diet plus RPL(hpL).The experiment was conducted for 8 *** showed that RPL increased the dry matter intake(Php group tended to have higher milk urea N(P=0.07).Plasma concentrations of Arg,Ile,Lys,Met,Pro,total essential AA and total nonessential AA were increased by RPL(Php group(Php group through an increase in urea N excretion(P<0.01)and an upward trend in plasma urea N(P=0.07).In addition,RPL tended to increase milk protein N secretion(P=0.08),milk N(P=0.07)and microbial protein synthesis(P=0.06),and decreased plasma urea N(P<0.001).In the hindgut,the bacterial community were different between the LP and LPL groups(P<0.01).The probiotic abundances of Christensenellaceae_R-7_group and Acinetobacter were increased by RPL(P=0.03 and 0.03,respectively).The pathogenic abundances of Clostridium_sensu_stricto_1(P<0.001)and Turicibacter(P<0.01)were decreased by *** conclusion,supplementing RPL with low dietary CP could balance AA supply and increase milk protein yield,resulting in an improvement in N utilization efficiency,and altered the composition of the hindgut microbiota to favor the lactation performance of dairy cows.

关键词： Rumen-protected lysine Milk protein N utilization Hindgut microbiota Dairy cow

考虑材料组分影响因素的hp-FRCC流动性能及力学性能

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水利与建筑工程学报 2024年第5期22卷 125-133页

作者：翁志英胡海楠耿丽曹悫吴应雄福州职业技术学院福建福州350108 福州大学土木工程学院福建福州350108 福建省建筑科学研究院责任有限公司福建福州350100 厦门大学嘉庚学院土木工程学院福建漳州363105

为制备适用于砖墙体面层加固的水泥基复合材料,降低其成本同时保证其力学性能,采用一种高性能纤维增强水泥基复合材料(hp-FRCC)用于砖墙体面加固,进而对hp-FRCC的流动度和力学强度进行研究分析,采用跳桌测试法及抗压抗拉测试,分析不同... 详细信息

为制备适用于砖墙体面层加固的水泥基复合材料,降低其成本同时保证其力学性能,采用一种高性能纤维增强水泥基复合材料(hp-FRCC)用于砖墙体面加固,进而对hp-FRCC的流动度和力学强度进行研究分析,采用跳桌测试法及抗压抗拉测试,分析不同水胶比、减水剂、石灰石粉、聚甲醛POM纤维掺量制备的hp-FRCC的流动性能和力学性能。结果表明:增大水胶比以及石灰石粉掺量能够改善流动性能,而纤维掺量的增大会导致流动度的降低。当POM纤维掺量为2.5%,石灰石粉掺量为35%~40%时,hp-FRCC力学性能最优,而随着水胶比的提高,力学性能下降,拉伸延性呈现先增后降的趋势。POM纤维与hp-FRCC基体之间存在较强的粘结力,纤维的存在促进抗拉强度以及延性的提高。减水剂掺量为2.0%时强度、拉伸延性最小但流动性能最佳。

关键词：纤维增强水泥基复合材料配合比流动性能力学性能