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Testing and evaluation for fatigue crack propagation of Ti-6Al-4V/ELI and 7050-T7452 alloys at high temperatures

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Chinese Journal of Aeronautics 2018年第6期31卷 1388-1398页

作者： yuntao zhu Junjiang XIONG Zhiyang LV Yanguang ZHAO School of Transportation Science and Engineering Beihang University Beijing 100083 China AECC Beijing Institute of Aeronautical Materials Beijing 100095 China

This paper seeks to evaluate crack propagation properties and residual lives of metallic alloys subjected to fatigue loading at room and high temperatures. Fatigue crack growth tests were performed on Ti-6Al-4V/ELI and 7050-T7452 subjected to constant-amplitude and actual randomspectra loading at room temperature of about 25 ℃ and at high temperatures of 250 ℃ and 150 ℃ to determine their crack growth properties and residual lives. The damage mode and mechanisms at high temperature were compared with those at room temperature on the basis of the results of fractographic analysis. Temperature-dependent residual lives under actual random-spectra load history were evaluated based on a modified accumulation damage rule accounting for the load *** correlation was achieved between the predictions and actual experiments, demonstrating the practical and effective use of the proposed method.

关键词： Crack growth Fatigue High temperature Metallic alloy Residual fife

Characterization and Methanol Adsorption of Walnutshell Activated Carbon Prepared by KOH Activation

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Journal of Wuhan University of Technology(Materials Science) 2016年第2期31卷 260-268页

作者：余琼粉李明 ji xu qiu yu zhu yuntao leng congbin Solar Energy Research Institute Yunnan Normal University Kunming 650500 China

Walnut-shellactivated carbons（WSACs）were prepared by the KOH *** effects of carbonization temperature,activation temperature,and ratio of KOH to chars on the pore development of WSACs were *** transform infrared spectroscopy（FTIR）,X-ray powder diffraction（XRD）,and scanning electron microscopy（SEM）were employed to characterize the microstructure and morphology of *** performance onto the optimalWSAC and the coal-based AC were also *** results show that the optimalpreparation conditions are a carbonization temperature of 700 ℃,an activation temperature of 700 ℃,and a mass ratio of *** BET surface area,the micropore volume,and the micropore volume percentage of the optimalWASC are 1636 m^2/g,0.641 cm^3/g and 81.97%,*** are a lot of micropores and a certain amount of meso-and *** characteristics of the amorphous state are *** results show that the optimalWSAC is favorable for *** equilibrium adsorption capacity of the optimalWSAC is 248.02mg/*** is shown that the equilibrium adsorption capacity of the optimalWSAC is almost equivalent to that of the common activated *** the optimalWSAC could be a potentialadsorbent for the solar energy adsorption refrigeration cycle.

关键词： walnut-shell activated carbon preparation conditions characterization methanol adsorption

右美托咪定联合酮咯酸氨丁三醇超前镇痛对腹腔镜下胆囊切除术患者麻醉效果的影响

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中国药物滥用防治杂志 2024年第6期30卷 1003-1006,1019页

作者：武瑞红朱允涛曹存礼张丽娜濮阳市第三人民医院麻醉科河南濮阳457000 濮阳市人民医院麻醉科河南濮阳457000 濮阳市中医院麻醉科河南濮阳457000

目的:探究右美托咪定酮咯酸氨丁三醇超前镇痛对腹腔镜下胆囊切除术(LC)患者麻醉苏醒质量、镇痛、镇静效果、应激反应的影响。方法:选取濮阳市第三人民医院2020年1月—2022年12月收治的80例LC患者,根据随机数字表法分为常规组和联合组,... 详细信息

目的:探究右美托咪定酮咯酸氨丁三醇超前镇痛对腹腔镜下胆囊切除术(LC)患者麻醉苏醒质量、镇痛、镇静效果、应激反应的影响。方法:选取濮阳市第三人民医院2020年1月—2022年12月收治的80例LC患者,根据随机数字表法分为常规组和联合组,各40例。常规组在常规麻醉前采用酮咯酸氨丁三醇进行超前镇痛,联合组在常规麻醉前采用右美托咪定联合酮咯酸氨丁三醇进行超前镇痛。比较两组麻醉苏醒质量、术后不同时间点镇静[Ramsay镇静量表评分(RSS)]、镇痛效果[疼痛视觉模拟量表(VAS)]、应激反应[胰岛素样生长因子-1(IGF-1)、肿瘤坏死因子-α(TNF-α)、白细胞介素-1β(IL-1β)、IL-6]、不良反应。结果:联合组拔管、苏醒时间及自主呼吸、定向力恢复时间短于常规组(P0.05)。结论:右美托咪定联合酮咯酸氨丁三醇超前镇痛用于LC术中具有较好的镇痛、镇静效果,能减轻患者术后应激反应,提升麻醉苏醒质量,且不良反应较少,具有较高的安全性。

关键词：腹腔镜胆囊切除术右美托咪定酮咯酸氨丁三醇

Sexual Dimorphism and Female Reproductive Characteristics in the Hainan Water Skink(Tropidophorus hainanus)from Hainan,South China

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Asian Herpetological Research 2024年第1期15卷 49-58页

作者： Yu DU Xiaming zhu Chixian LIN yuntao YAO Xiang JI Hainan Key Laboratory for Herpetological Research College of Fisheries and Life SciencesHainan Tropical Ocean UniversitySanya 572022HainanChina Zhejiang Provincial Key Laboratory for Water Environment and Marine Biological Resources Protection College of Life and Environmental SciencesWenzhou UniversityWenzhou 325035ZhejiangChina Institute for Eco-environmental Research of Sanyang Wetland Wenzhou UniversityWenzhou 325014ZhejiangChina

We studied sexual dimorphism in body size and shape and female reproductive characteristics in the Hainan Water Skink(Tropidophorus hainanus)from Hainan,South *** our sample the largest female and male were 61.1 and 55.2 mm snout-vent length(SVL),*** mean SVL was larger in adult females(52.0 mm)than in adult males(48.3 mm).Juveniles were sexually dimorphic in head length but not in other examined morphological *** males were longer in head length and shorter in abdomen length and fore-limb length than adult females of the same *** shifts in sexual dimorphism in body shape were evident,as revealed by the fact that morphological differences between the sexes were more pronounced in adults than in *** produced a single litter of 3–6 offspring per season from early August to early *** size,litter mass and offspring(neonate)mass were positively related to female *** mass was independent of relative *** the above findings we draw three main ***,females are the larger sex in ***,and sexual dimorphism in body shape is more pronounced in adults than in ***,larger female *** produce more and larger offspring and thus heavier litters than smaller ***,the offspring size-number trade-off does is not evident in ***.

关键词： fecundity morphology offspring size-number trade-off reproduction scincidae sexual dimorphism

Two-stage aging treatment to accelerate aging kinetics without impairing strength in B_4C/7A04Al composite

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Science China(Technological Sciences) 2024年第8期67卷 2485-2492页

作者： CHEN yuntao MA GuoNan zhu ShiZe WANG Dong XIAO BoLv MA ZongYi Shi-Changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China Centre of Excellence for Advanced Materials Dongguan 523808China

Aging treatments are the key process to obtain satisfactory strength for 7xxxAl alloys and their composites. However, traditional single-stage(SS) aging is time-consuming to reach a peak strength condition. In this study, an efficient 120℃ + 160℃ two-stage(TS) aging treatment was proposed on a B_4C/7A04Al composite fabricated via powder metallurgy(PM) technology, which could acquire similar peak-aging strength but only took about 15% of the time compared to traditional 120℃ SS aging. The evolution of precipitation during the TS aging was investigated, as well as those of the 7A04Al alloys for comparison. In the second stage aging process, the higher aging temperature accelerated the nucleation of η′ phases inside the grains and thus increased the density of precipitates. Moreover, the short aging time limited the coarsening of precipitates and the broadening of precipitatefree zones. The above factors were beneficial for quickly obtaining satisfactory precipitation strengthening effects. The B_4C/7A04Al composite exhibited slower aging kinetics than the 7A04Al alloy in the TS aging. Mg elements consumption by the chemical reaction between B impurities introduced by B_4C particles and the Al matrix was considered to potentially retard the aging kinetics of the B_4C/7A04Al composite. Nevertheless, the precipitation sequence was not affected.

关键词： aluminum matrix composites aging treatment powder metallurgy mechanical properties precipitation

Integrated thin film lithium niobate Fabry–Perot modulator[Invited]

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Chinese Optics Letters 2021年第6期19卷 8-12页

作者： Mengyue Xu Mingbo He yuntao zhu Lin Liu Lifeng Chen Siyuan Yu Xinlun Cai State Key Laboratory of Optoelectronic Materials and Technologies and School of Electronics and Information Technology Sun Yat-sen UniversityGuangzhou 510000China

Integrated traveling-wave lithium niobate modulators need relatively large device lengths to achieve low drive voltage. To increase modulation efficiency within a compact footprint, we report an integrated Fabry–Perot-type electro-optic thin film lithium niobate on insulator modulator comprising a phase modulation region sandwiched between two distributed Bragg reflectors. The device exhibits low optical loss and a high tuning efficiency of 15.7 pm/V. We also confirm the modulator's high-speed modulation performance by non-return-to-zero modulation with a data rate up to 56 Gbit/s.

关键词： integrated optic devices lithium niobate optical modulators microstructure fabrication

Animal Modelling of Lumbar Corpectomy and Fusion and in vivo Growth of Spine Supporting Bone by Titanium Cage Implants: An Experimental Study

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Journal of Bionic Engineering 2010年第4期7卷 329-336页

作者： Qingxian Hou,Qingsan zhu,yuntao Wu,Ran Li,Dan Li,Yunfeng Zhang,Qing Ruan First Hospital of Jilin University,Changchun 130021,P.R.China First Hospital of Jilin University Changchun P. R. China

In this study a lumbar spinal fusion animal model is established to assess the effect of spinal fusion cage,and explore theminimum area ratio of titanium cage section to vertebral section that ensures bone healing and biomechanical *** was conducted by posterolateral approach with titanium cage implantation combined with plate *** with the same length but different diameters were *** implantation of titanium cages,the progress of bone healingwas observed and the bone biomechanical properties were measured,including deformation and displacement in axial compression,flexion,extension,and lateral bending *** factors affecting the in vivo growth of spine supporting body *** results show that the area ratio of titanium cage section to vertebral section should reach 1/2 to ensure the bonehealing,sufficient bone intensity and biomechanical *** bone healing indicators,such as BMP,suggest that there isa relationship between the peak time and the peak value of bone formation and metabolism markers and the bone healing strength.

关键词： lumbar corpectomy titanium cage implantation spinal fusion biomechanics bone metabolism markers

Parameter calibration of the tensile-shear interactive damage constitutive model for sandstone failure

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第4期16卷 1153-1174页

作者： Yun Shu Zheming zhu Meng Wang Weiting Gao Fei Wang Duanying Wan yuntao Wang MOE Key Laboratory of Deep Earth Science and Engineering College of Architecture and EnvironmentSichuan UniversityChengdu610065China Failure Mechanics and Engineering Disaster Prevention Key Laboratory of Sichuan ProvinceSichuan UniversityChengdu610065China Tianfu Engineering-oriented Numerical Simulation & Software Innovation Center Chengdu620107China

The tensile-shear interactive damage(TSID)model is a novel and powerful constitutive model for rock-like *** study proposes a methodology to calibrate the TSID model parameters to simulate *** basic parameters of sandstone are determined through a series of static and dynamic tests,including uniaxial compression,Brazilian disc,triaxial compression under varying confining pressures,hydrostatic compression,and dynamic compression and tensile tests with a split Hopkinson pressure *** on the sandstone test results from this study and previous research,a step-by-step procedure for parameter calibration is outlined,which accounts for the categories of the strength surface,equation of state(EOS),strain rate effect,and *** calibrated parameters are verified through numerical tests that correspond to the experimental loading *** between numerical results and experimental data indicates the precision and reliability of the calibrated *** methodology presented in this study is scientifically sound,straightforward,and essential for improving the TSID ***,it has the potential to contribute to other rock constitutive models,particularly new user-defined models.

关键词： Damage constitutive model Parameter calibration Rock modeling Sandstone Dynamic impact load Tensile-shear interactive damage(TSID)model

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艺人的作为:“传”字辈昆剧承传之路述论

戏剧艺术 2023年第4期 41-54页

作者：朱云涛江苏开放大学艺术学院

戏以人传,昆剧传习所的创办赋予了“传”字辈承传昆剧的历史使命。作为承传的主体,“传”字辈在继承全福班艺人技艺之后,通过长期的舞台实践以及向后辈传艺延续了昆剧的一脉馨香。不过,因为受到各种因素的影响和制约,他们的昆剧传承之... 详细信息

戏以人传,昆剧传习所的创办赋予了“传”字辈承传昆剧的历史使命。作为承传的主体,“传”字辈在继承全福班艺人技艺之后,通过长期的舞台实践以及向后辈传艺延续了昆剧的一脉馨香。不过,因为受到各种因素的影响和制约,他们的昆剧传承之路表现出明显的阶段性,昆剧艺术的特征和品质也随之发生变化。20世纪二三十年代,“传”字辈继承了正统的昆剧艺术,其后出于竞争的需要,表演中融入了京剧的技艺。20世纪五六十年代,由于培养方式、传承观念以及地域文化的不同,江浙沪三地昆剧演剧风格呈现出地域性差异。20世纪八九十年代,“传”字辈与其后辈在观念上存在冲突,由此引发昆剧艺术的诸多变异。

关键词： “传”字辈昆剧传承姑苏风范昆剧形态

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