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Influence of Sc Addition on Precipitation Behavior and Properties of Al-Cu-Mg Alloy

Acta Metallurgica Sinica(English Letters) 2022年第6期35卷 948-960页

作者： Xiangbin Han Shuangbao Wang Bo Wei Shuai Pan Guizhen Liao weizhou Li Yuezhou Wei School of Resources Environment and MaterialsGuangxi UniversityNanning 530004China Key Laboratory of LCR Materials and Devices of Yunnan Province National Center for International Research On Photoelectric and Energy MaterialsSchool of Materials and EnergyYunnan UniversityKunming 650091China

In this study, the Al-5.10Cu-0.65 Mg alloys without and with 0.2 wt% Sc addition were prepared to unveil the effect of Sc on the precipitate behavior and properties by atomic-scale scanning transmission electron microscopy. The results show that addition of Sc is able to significantly suppress the formation of the peak-hardening θ’ and S precipitates but in favor of stabilizing Guinier–Preston–Bagaryatsky(GPB) zones during isothermal aging at 180 ℃. The generation of unique GPB precursors dictating the evolution of the subsequent peak-hardening GPB zones is highly correlated with the insufficient vacancies and dragging effect of Sc to Cu in the Al-Cu-Mg-Sc alloy, thereby restricting the nucleation of θ′ and S precipitates owing to the decreased available Cu solutes. In property, 0.2 wt% Sc addition can not only enhance the corrosion resistance but also the electrical conductivity of the peak-hardening alloy. In addition, the peak-hardening Al-Cu-Mg-Sc alloy is also featured with increased strength without losing the ductility compared to its solid solution state. Further analyses indicate that the improved properties are essentially attributed to the formation of densely distributed strain-free GPB zones and smaller precipitate-free zones. The obtained results could provide a potential design strategy of high-performance alloys by Sc addition.

关键词： Al alloy Micro-alloying Precipitation Atomistic mechanism Transmission electron microscopy

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锂碳复合材料研究进展

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电源技术 2024年第8期48卷 1452-1465页

作者：王维宙陈子婵孔德钰郇庆娜孙兆勇陈强天津中能锂业有限公司天津300462

金属锂具有较高的理论比容量和较低的密度,将其作为负极材料,电池将获得较高的能量密度。然而,在实际应用中受不可控的锂枝晶、非活性锂的形成和积累、锂的体积膨胀及不稳定的固体电解质膜等因素的影响,限制了金属锂的商业化应用。将金... 详细信息

金属锂具有较高的理论比容量和较低的密度,将其作为负极材料,电池将获得较高的能量密度。然而,在实际应用中受不可控的锂枝晶、非活性锂的形成和积累、锂的体积膨胀及不稳定的固体电解质膜等因素的影响,限制了金属锂的商业化应用。将金属锂与碳材料复合制备锂碳材料可有效缓解上述问题。锂碳复合材料包括锂-石墨烯复合材料、锂-石墨复合材料、锂-碳纤维复合材料和锂-碳纳米管复合材料等。分类介绍了锂碳复合材料及其制备方法和电化学性能,并指出每类锂碳复合材料的优势和存在的问题,最后展望了未来锂碳材料的发展方向。

关键词：锂碳复合材料锂-石墨烯锂-石墨锂-碳纤维锂-碳纳米管

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Efficacy and safety of drug-eluting stent implantation for the treatment of in-stent restenosis occurring within bare-metal stent and drug-eluting stent

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2010年第8期11卷 553-560页

作者： Heng GE Qing ZHANG weizhou Qing HE Zhi-hua HAN Ben HE Department of Cardiology Shanghai Renji Hospital School of Medicine Shanghai Jiao Tong University Shanghai 200001 China Department of Radiology Shanghai Renji Hospital School of Medicine Shanghai Jiao Tong University Shanghai 200001 China

Objective:Although drug-eluting stent(DES) implantation is the primary treatment modality for bare-metal stent(BMS) in-stent restenosis(ISR),little is known about the efficacy and safety profile of DES in the treatment of *** goal of this study was to compare the clinical outcomes following DES treatment for BMS-ISR and ***:Rates of major adverse cardiac events(MACE) were compared in 97 consecutive patients who underwent DES implantation for the treatment of ISR(56 BMS-ISR and 41 DES-ISR) from January 2004 to December ***:Baseline clinical and procedural characteristics were comparable,except that the DES used in the BMS-ISR group was longer and had a larger *** length of follow-up was(28.60±1.96) and(20.34±1.54) months for the BMS-ISR and DES-ISR groups,*** patient(1.8%) experienced non-cardiac mortality and one(1.8%) had target-vessel revascularization(TVR) in the BMS-ISR *** the DES-ISR group,three patients(7.3%) died of sudden death with a documented acute ST-segment elevation myocardial infarction,and three suffered TVR(7.3%).Kaplan-Meier analysis indicated that cumulative survival probability and MACE-free probability were both significantly lower for the DES-ISR group(log rank test P=0.047 and P=0.005,respectively).In Cox regression analysis,DES-ISR remained an independent predictor for future MACE occurrence after adjustment for other factors(compared with BMS-ISR,risk ratio(RR)=8.743,95% confidence interval(CI) 1.54-49.54,P=0.014).Switching to a different type of DES to treat DES-ISR did not improve the ***:DES-ISR patients had a poorer prognosis than BMS-ISR patients after DES therapy.

关键词： Atherosclerosis In-stent restenosis Bare-metal stent Drug-eluting stent

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Sm-Nd isotopic compositions of Cambrian-Ordovician strata at the Jinggangshan area in Jiangxi Province: Tectonic implications

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Chinese Science Bulletin 2009年第10期54卷 1750-1758页

作者： SHEN weizhou LING HongFei SHU LiangShu ZHANG FangRong XIANG Lei State Key Laboratory for Mineral Deposits Research College of Earth Sciences and Engineering Nanjing University Nanjing 210093China Geological Survey Institute Jiangxi Province Nanchang 330030 China

Whole-rock Sm-Nd isotopes were investigated for Cambrian-Ordovician strata from the Jinggangshan area between the Yangtze Block and Cathysia Block in South China. These strata were deposited as a greatly thick unit of muddy-sandy laminas with intercalated carbonate and organic carbon-bearing layers. They have low εNd(t) values of –13.9 to –7.9 and old Nd model ages of 1842 to 2375 Ma. In tDM-tStr diagram, they are far away from the concordant line but fall within the evolution zone of the Proterozoic crust of South China. This indicates that the Cambrian-Ordovician strata are mainly composed of mat- ters eroded from ancient Paleoproterozoic crust that may mainly consist of continental-derived detrital sediments with high maturity in the Cathysia Block. However, the Ordovician Jueshangou Formation and Dui’ershi Formation have εNd(t) values of –10.5 and –7.9 at the higher end of the above range and Nd model ages of 1842 to 2059 Ma at the lower end of the above range. This suggests involvement of more detritus that were eroded from the relatively juvenile crust from Late Paleoproterozoic to the Early Neoproterozoic. All the Nd model ages for the Cambrian-Ordovician sedimentary rocks in the Cathysia Block and the southeastern margin of the Yangtze Block are older than 1800 Ma, suggesting that no material from the Early Paleozoic depleted mantle-derived magmas was involved in these regions.

关键词： Nd同位素井冈山地区地层沉积奥陶系寒武系同位素组成构造意义 Sm

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Petrogenesis of Early Cretaceous adakitic granodiorite: Implication for a crust thickening event within the Cathaysia Block, South China

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Science China Earth Sciences 2017年第7期60卷 1237-1255页

作者： SUN LiQiang LING HongFei ZHAO KuiDong CHEN PeiRong CHEN WeiFeng SUN Tao SHEN weizhou HUANG GuoLong State Key Laboratory for Mineral Deposits Research School of Earth Sciences and Engineering Nanjing University State Key Laboratory of Geological Processes and Mineral Resources and Collaborative Innovation Center for Exploration of Strategic Mineral Resources Faculty of Earth Resource China University of Geosciences Research Institute No.290 China National Nuclear Corporation

Adakitic rocks in continental settings are commonly considered to be formed by partial melting of thickened or delaminated lower crust. Investigations on this kind of rocks can provide important information about crustal evolution complementary to information from other rocks. This paper reports adakitic granodiorite of the Lingxi pluton in the interior of the Cathayisa Block. LA-ICP-MS zircon U-Pb dating shows that it was formed in the late Early Cretaceous(100±1 Ma). The granodiorite has geochemical features of adakitic rocks derived from partial melting of the thickened lower crust, e.g., high SiO2(mainly ranging from 64.4 to 68.9 wt.%) and Sr(624–894 ppm) contents, Sr/Y(49.9–60.8) and La/Yb(23.4–42.8) values, low Y(10.3–17.1 ppm), Ni(5.62–11.8 ppm) and MgO(mostly from 0.86 wt.% to 1.57 wt.%) contents and weak Eu anomaly. It has initial 87Sr/86 Sr ratios of 0.7086–0.7091, εNd(t) values of.6.2 to.5.9 and zircon εHf(t) values mostly of.10.1 to.7.6. Based on the geochemical characteristics and simple modelling, it is suggested that the most likely generation mechanism of the Lingxi granodiorite is partial melting of a thickened Proterozoic lower continental crust at a pressure ≥12 kbar(or crust thickness ≥40km), leaving a garnet-bearing amphibolite residue. Combining our results and previous studies of the tectonic evolution of the Cathaysia Block, we propose that the crust was thickened to over 40 km by a compressive event occurring during the late Early Cretaceous, which is supported by the observation that there is an angular unconformity between the Upper Cretaceous Series and the early Lower Cretaceous or the Jurassic rocks. After this event, the Cathaysia Block experienced a lithospheric extension and thinning probably driven by the high-angle paleo-Pacific subduction. With the attenuation of lithosphere, the lower crust was heated to partial melting by upwelling asthenospheric materials, resulting in generation of the Lingxi granodiorite and other coeval gran

关键词： Sr-Nd-Hf isotopes Adakitic rock Thickened crest Early Cretaceous South China

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Petrogenesis of Mesozoic granitoids and volcanic rocks in South China： A response to tectonic evolution

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Episodes 2006年第1期29卷 26-33页

作者： Xinmin Zhou Tao Sun weizhou Shen Liangshu Shu Yaoling Niu Department of Earth Sciences Nanjing University Nanjing 210093 China. Department of Earth Sciences Durham University Durham DHI 3LE UK.

This paper summarizes the new results on the petrogenesis of Mesozoic granitoids and volcanic rocks in South China. The authors propose that these rocks were formed in time and space as a response to regional tectonic regime change from the continent-continent collision of the Indosinian orogeny within the broad Tethyan orogenic domain in the Early Mesozoic （T1-T3）（Period Ⅰ） to the largely extensional setting as a result of the Yanshanian orogeny genetically associated with the NW-WNW-ward subduction of the paleo-Pacific oceanic lithosphere in the Late Mesozoic （J2-K2）（Period Ⅱ）. Of the Period I Indosinian granitoids, the early （T1-T2^1） ones are syn-collisional, and formed in a compressional setting; the late （T2^2-T3） ones are latecollisional, and formed in a locally extensional environment. During the Period Ⅱ Yanshanian magmatism, the Early Yanshanian （J2-J3） granitoid-volcanic rocks, which are distributed mainly in the Nanling Range and in the interior of the South China tectonic block （SCB）, are characteristic of rift-type intraplate magmatism, whereas the Late Yanshanian K1 granitoidovolcanic rocks are interpreted as genetically representing active continental margin magmatism. The K2 tholeiitic basalts interlayered with red beds are interpreted as genetically associated with the development of back-arc extensional basins in the interior of the SCB. The Yanshanian granitoid-volcanic rocks are distributed widely in South China, reflecting extensional tectonics within much of the SCB. The extension-induced deep crustal melting and underplating of mantle-derived basaltic melts are suggested as the two principal driving mechanisms for the Yanshanian granitic magmatism in South China.

关键词： SOUTHEASTERN CHINA CRUSTAL EVOLUTION JAPANESE ISLANDS GEOCHEMISTRY MAGMATISM ASIA ND CONSTRAINTS SUBDUCTION ACCRETION

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特发性面神经麻痹非药物治疗研究进展

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中国医学创新 2024年第11期21卷 163-166页

作者：武卫周薛庆峰杨海霞进高梅中国人民解放军联勤保障部队第九八五医院神经内科山西太原030001 中国人民解放军联勤保障部队第九八五医院麻醉科山西太原030001

特发性面神经麻痹(idiopathic facial palsy,IFP)是临床上常见的疾病,目前药物治疗仍以抗病毒、激素及营养神经为主,但治疗效果并不理想。因此,针灸、物理疗法及手术等非药物治疗方法也成为IFP患者的重要选择,它可以有效补充药物治疗中... 详细信息

特发性面神经麻痹(idiopathic facial palsy,IFP)是临床上常见的疾病,目前药物治疗仍以抗病毒、激素及营养神经为主,但治疗效果并不理想。因此,针灸、物理疗法及手术等非药物治疗方法也成为IFP患者的重要选择,它可以有效补充药物治疗中存在的不足。本文将IFP非药物治疗方法进行归纳、总结,以期对临床有所帮助。

关键词：特发性面神经麻痹针灸物理疗法手术治疗

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Effects of fiber orientation on tool wear evolution and wear mechanism when cutting carbon fiber reinforced plastics

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Chinese Journal of Aeronautics 2023年第5期36卷 549-565页

作者： weizhou WU Shipeng LI Xuda QIN Wentao LIU Xin CUI Hao LI Mengrui SHI Haibao LIU Key Laboratory of Mechanism Theory and Equipment Design of Ministry of Education Tianjin UniversityTianjin 300350China Tianjin Aerospace Long March Launch Vehicle Manufacturing Co.Ltd Tianjin 30000China Centre for Aeronautics School of AerospaceTransport and ManufacturingCranfield UniversityCranfield MK430ALUK

The aim of the present paper is to reveal the influence of different fiber orientations on the tool wear evolution and wear mechanism. Side-milling experiments with large-diameter milling tools are conducted. A finite element(FE) cutting model of carbon fiber reinforced plastics(CFRP)is established to get insight into the cutting stress status at different wear stages. The results show that different fiber orientations bring about distinct differences in the extent, profile and mechanism of tool wear. Severer wear occurs when cutting 45° and 90° plies, followed by 0°, correspondingly,the least wear is obtained when θ = 135°(θ represents the orientation of fibers). Moreover, the worn profiles of cutting tools when θ = 0° and 45° are waterfall edge, while round edge occurs whenθ = 135° and a combined shape of waterfall and round edge is obtained when θ = 90°. The wear mechanisms under different fiber orientations are strongly dependent on the cutting stress distributions. The evolution of tool wear profile is basically consistent with the stress distribution on the tool surface at different wear stages, and the extent of tool wear is determined by the magnitude of stress on the tool surface. Besides, the worn edges produce an actual negative clearance angle,which decreases the actual cutting thickness and leads to compressing and bending failure of fibers beneath the cutting region as well as low surface qualities.

关键词： Carbon fiber reinforced plastics(CFRP) Fiber orientation Finite element method(FEM) Tool wear Wear mechanism

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The thermal history of the miarolitic granite at Xincun, Fujian Province, China

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Chinese Science Bulletin 2000年第21期45卷 1991-1995页

作者： SHEN weizhou LING Hongfei LI Huimin LI Wuxian WANG Dezi State Key Laboratory for Mineral Deposits Research Department of Earth SciencesNanjing UniversityNanjing 210093China Tianjin Institute of Geology and Deposits the Ministry of Land and ResourcesTianjin 300170China Guangzhou Institute of Geochemistry Chinese Academy of SciencesGuangzhou 510640China

The thermal history of the late Mesozoic miarolitic granite has been studied based on zircon U-Pb dating, whole rock Rb-Sr dating and K-Ar dating of muscovite, biotite and K-feldspar from the same rock sample. From the beginning of zircon crystallization to the closure of K-Ar system of biotite, the granite body had a slow cooling rate (11.0℃/Ma) and an ascending rate (0.07 mm/a). From the end of this stage to the closure of K-Ar system of K-feldspar, the granite body increased its cooling rate (45℃/Ma) and ascending rate (0.36 mm/a). The thermal history of the Xincun granite with a slow cooling rate at the early stage and a fast cooling rate at the late stage may have been related to the fact that the Fujian coastal area had very high geothermal gradient in the late Mesozoic and evident decrease in geothermal gradient in the early Cenozoic.

关键词： closure temperature thermal history paleothermal gradient Xincun miarolitic granite.

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Effects of Airflow Field on Droplets Diameter inside the Corrugated Packing of a Rotating Packed Bed

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China Petroleum Processing & Petrochemical Technology 2014年第4期16卷 38-46页

作者： Xu Chengcheng Jiao weizhou Liu Youzhi Guo Liang Yuan Zhiguo Zhang Qiaoling Shanxi Province Key Laboratory of Higee-Oriented Chemical Engineering North University of China

Rotating packing bed(RPB) has a better mixing performance than traditional mixers and shows potential application in the petroleum industry. However, acquisition of information about the mixing process directly through experiments is difficult because of the compact structure and complex multiphase flow pattern in RPB. To study the mixing characteristic, Fluent, the computational fluid dynamics(CFD) software, was used to explore the effect of airflow field on droplet diameter. For conducting calculations, the gas-liquid two-phase flow inside the packing was simulated with the RNG k-ε turbulence model and the Lagrange Discrete Phase Model(DPM), respectively. The numerical calculation results showed that coalescence and breakup of droplets can take place in the gas phase flow inside the packing and can be strengthened with increased rotating speed, thereby leading to the enlargement of the average diameter.

关键词： rotating packed bed computational fluid dynamics gas-liquid flow field diameter mixing

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