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Effect of stress-relief annealing on thermal fatigue cracks for die-casting die steels

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Journal of Iron and Steel Research(International) 2024年第5期31卷 1164-1176页

作者： Zhi-xiong Bai xiao-chun Wu School of Materials Science and Engineering Shanghai UniversityShanghai200444China

The effect of stress-relief annealing at different stages of thermal fatigue tests on crack growth was investigated using a self-built thermal cycle *** results showed that annealing could limit crack expansion *** reduced dislocation density and released the accumulation of residual *** addition,the strain accumulation in carbides was reduced by this *** was also found that double annealing was even more effective at inhibiting crack expansion compared to single stress-relief *** 1000 cycles,the maximum crack length was reduced by 31.1%and 45.2%for the samples after using the optimal single and double annealing processes,*** single stress-relief annealing,earlier annealing provides more benefit in delaying crack ***,effective double stress-relief annealing requires a suitable time interval between the annealing ***,after 800 cycles,surface hardness decreased significantly accompanied by an increase in the size and number of carbides,and cracks expanded predominantly along grain boundaries.

关键词： Thermal fatigue Steel Carbide Stress-relief annealing Dislocation Residual stress

“双高计划”背景下九江职业技术学院现代化治理模式创新与实践

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九江职业技术学院学报 2024年第2期 1-5,53页

作者：曾青生卢致俊肖雄张海峰九江职业技术学院江西九江332007

高职院校推进现代治理体系建设是贯彻落实以习近平同志为核心的党中央关于“坚持和完善中国特色社会主义制度、推进国家治理体系和治理能力现代化”重大决策部署的具体体现,也是深化落实我国现代职业教育体系建设改革的重要举措。九江... 详细信息

高职院校推进现代治理体系建设是贯彻落实以习近平同志为核心的党中央关于“坚持和完善中国特色社会主义制度、推进国家治理体系和治理能力现代化”重大决策部署的具体体现,也是深化落实我国现代职业教育体系建设改革的重要举措。九江职业技术学院以实施“中国特色高水平高职学校和专业建设计划”(简称“双高计划”)为契机,打破传统“学校本位、自上而下”的“一元管理”桎梏,从治理结构、治理制度、治理文化、治理任务四个维度,探索构建“多元共治”的现代化治理模式,有效推动和保障“双高计划”实施见效。

关键词：一元管理多元共治现代化治理

基于实际工程的地埋管地源热泵回填材料导热性能差异分析

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河南科学 2024年第5期42卷 769-780页

作者：杨珍尚永升肖雄黄烜李尧刘健河南省地质局生态环境地质服务中心郑州450053 河南省地热能开发工程技术研究中心郑州450053 中国石化集团新星石油有限责任公司北京100083

为研究实际工程应用中回填材料导热性能差异,以郑州市浅层地热能示范工程为研究对象,通过现场热响应试验、地温监测、数值模拟对中细砂、中细砂+水泥、中细砂+膨润土、原浆四种常见回填材料导热性能进行分析.研究结果表明:原浆的平均导... 详细信息

为研究实际工程应用中回填材料导热性能差异,以郑州市浅层地热能示范工程为研究对象,通过现场热响应试验、地温监测、数值模拟对中细砂、中细砂+水泥、中细砂+膨润土、原浆四种常见回填材料导热性能进行分析.研究结果表明:原浆的平均导热率最低为1.83 W/(m·℃),中细砂的平均导热率最大为2.17 W/(m·℃);同时中细砂排热和取热下单位深度换热量也为最大,分别为48.52 W/m和47.38 W/m.夏季制冷时中细砂+水泥材料温度仅升高0.0002℃,远低于中细砂材料温度升高;而冬季供暖时,四种材料的温度下降值相近,最小为4.2842℃.基于数值模拟结果,中细砂放热和吸热工况下热影响半径最小,为分别5.5 m和6 m;同时,岩土体温度增温速度由大到小为中细砂、原浆、中细砂+膨润土、中细砂+水泥.因此,中细砂导热性能最好,可作为研究区域地埋管地源热泵回填材料的首选.研究成果为场地条件相似地区地埋管地源热泵回填材料选择提供依据,并对推进郑州地区能源绿色低碳发展具有一定参考意义.

关键词：地埋管地源热泵回填材料现场热响应试验地温监测数值模拟

武汉四环线吴家山至沌口段软土地基病害处置技术研究

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建筑技术 2024年第10期55卷 1198-1201页

作者：黎华林周小雄向锐郑志勇中交第二公路勘察设计研究院有限公司武汉430056

武汉四环线吴家山至沌口K81+700~K82+600段两侧鱼(藕)塘密布,软土较厚,地质条件差。软土地基经过清淤回填+土工格栅+碎石垫层+CFG桩方式初步治理后,发生路面裂缝等病害,主要是由于路基填土未得到有效压实、沉降,形成超静孔隙水压力,以... 详细信息

武汉四环线吴家山至沌口K81+700~K82+600段两侧鱼(藕)塘密布,软土较厚,地质条件差。软土地基经过清淤回填+土工格栅+碎石垫层+CFG桩方式初步治理后,发生路面裂缝等病害,主要是由于路基填土未得到有效压实、沉降,形成超静孔隙水压力,以及降雨丰沛和重载车辆频繁行驶造成的,因此采用了注浆加固路基+抛石挤淤+反压护坡道的方式对裂缝进行治理。治理监测结果和长期的通车运行表明,路面稳定、软土地基病害得到有效处置。

关键词：软土地基病害处置路面裂缝 CFG桩注浆加固

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新时代“楚怡”精神的价值意蕴及其传承意义

湖北开放职业学院学报 2024年第13期37卷 60-62页

作者：谭小雄邓喜英罗演湖南环境生物职业技术学院湖南衡阳421005

“楚怡”精神是历经40余年的办学沉淀与百余年的传承发展,形成了由“楚怡”职教精神、乐育精神、创新精神等构成的综合体。新时代发展又使其蕴含了心怀“国之大者”,服务“强国建设”,“学工研用结合”,“敢为人先、坚韧坚守”等价值特... 详细信息

“楚怡”精神是历经40余年的办学沉淀与百余年的传承发展,形成了由“楚怡”职教精神、乐育精神、创新精神等构成的综合体。新时代发展又使其蕴含了心怀“国之大者”,服务“强国建设”,“学工研用结合”,“敢为人先、坚韧坚守”等价值特质。新时代“职教人”继承弘扬“楚怡”精神,深化职教综合改革,推进职教高质量发展,既是落实立德树人根本任务的必然要求,也是我国全面建设社会主义现代化强国的应然之举,更是全面推动湖南职教改革发展高地建设的内在要求。

关键词：新时代 “楚怡”精神价值意蕴传承意义

Facile and Large-scale Fabrication of Biodegradable Thermochromic Fibers Based on Poly(lactic acid)

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Chinese Journal of Polymer Science 2022年第10期40卷 1242-1251,I0010页

作者： xiao-xiong Chen Jin-Chao Yu Kang Chen Peng Ji Xiang-Ling Chen Zhi-Juan Pan College of Textile and Clothing Engineering Soochow UniversitySuzhou 215123China Engineering Research Center of Technical Textiles Ministry of EducationDonghua UniversityShanghai 201620China College of Materials and Textiles and National Engineering Laboratory for Textile Fiber Materials and Processing Technology Zhejiang Sci-Tech UniversityHangzhou 310018China Co-Innovation Center for Textile Industry Donghua UniversityShanghai 201620China

To investigate the feasibility of developing biobased and biodegradable thermochromic fibers,poly(lactic acid)(PLA)fibers with visual temperature indicator functionality were fabricated using a scalable melt spinning technique(spinning speed 800 m/min),where PLA and thermochromic microcapsules were used as fiber-forming polymers and color indicators,*** effect of thermochromic microcapsules on the mechanical properties and reversible color-changing function of PLA fibers was systematically investigated to achieve high tenacity and sensitive color-changing *** difference in the fiber performance was connected to changes in the multilayer *** results show that PLA fibers exhibit excellent tenacity of 3.7-4.7 cN/dtex and reversible and stable thermochromic behavior over 31℃.The high fraction of mesophase within TPLA-1 fiber plays an important role in its ***,the low-concentration of microcapsules(~1 wt%)with good dispersion could act as a nucleating agent inside the PLA matrix and contribute to the formation of microcrystals in the amorphous between primary lamellae,which is also beneficial to maintain the tenacity of the *** agglomeration of high-concentration microcapsules within PLA fibers hampered the formation of mesophase,resulting in a decrease in fiber *** from the content of microcapsules,the agglomeration of high-concentration microcapsules(>5 wt%)is the main reason that limits the substantial increase in fiber color *** study opens up new possibilities for degradable thermochromic fibers produced using standard industrial spinning technology.

关键词： Poly(lactic acid)fiber Reversible thermochromic fiber Biodegradable Melt spinning

应变弹性成像和彩色多普勒技术对二维超声诊断的乳腺非肿块型病变的诊断价值

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影像技术 2024年第3期36卷 70-75页

作者：李琳孙俊旗肖雨雄单菲菲汕头大学医学院附属粤北人民医院超声诊断科广东512000 汕头大学医学院附属粤北人民医院影像诊断科广东512000

目的:探讨应变弹性成像(strain elastography,SE)和彩色多普勒技术(color Doppler flow image,CDFI)对二维超声(two-dimensional ultrasound,2D US)诊断的乳腺非肿块型病变(non-mass-like lesions,NML)的诊断价值,提高乳腺非肿块型病变的检出率。方法:回顾性分析102例经2D US、CDFI及SE诊断、并经病理学证实的乳腺非肿块型病变,计算2D US、CDFI及SE的诊断效能,来区分乳腺非肿块型病变的良恶性。结果:102例中,良性46个,恶性56个。2D US诊断敏感度75.00%、特异度56.67%、准确率66.7%、AUC 0.662;SE诊断敏感度86.11%、特异度83.33%、准确率84.85%、AUC 0.902;CDFI诊断敏感度80.56%、特异度66.67%、准确率74.24%、AUC 0.828;2D US+SE+CDFI诊断敏感度91.67%、特异度90.00%、准确率90.91%、AUC 0.974。结论:2D US联合SE和CDFI可以提高乳腺非肿块型病变的诊断价值,有助于预测非肿块型乳腺恶性病变。

关键词：乳腺非肿块型病变应变弹性成像彩色多普勒技术

加味茵陈黄柴汤联合经皮肝穿刺胆管引流治疗恶性梗阻性黄疸的临床观察

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中医肿瘤学杂志 2024年第3期6卷 49-53页

作者：徐尚斌陈挺松张跃吴孝雄上海市第七人民医院肿瘤介入科上海200137

目的探讨加味茵陈黄柴汤联合经皮肝穿刺胆管引流治疗恶性梗阻性黄疸的效果。方法纳入2022年1月~2023年12月上海市第七人民医院100例恶性梗阻性黄疸住院患者,随机分为观察组、对照组各50例。对照组予经皮肝穿刺胆管引流及西药护肝利胆治... 详细信息

目的探讨加味茵陈黄柴汤联合经皮肝穿刺胆管引流治疗恶性梗阻性黄疸的效果。方法纳入2022年1月~2023年12月上海市第七人民医院100例恶性梗阻性黄疸住院患者,随机分为观察组、对照组各50例。对照组予经皮肝穿刺胆管引流及西药护肝利胆治疗,观察组在对照组基础上予加味茵陈黄柴汤治疗14天。观察两组患者治疗1周及2周时肝功能指标(血清总胆红素、丙氨酸氨基转移酶、天门冬氨酸氨基转移酶)及中医证候积分(黄染、皮肤瘙痒、胁痛、纳差、乏力)变化情况。结果共脱落19例,最终纳入对照组42例、观察组39例进行统计分析,治疗前后比较,治疗1周时两组患者的血清总胆红素、丙氨酸氨基转移酶、天门冬氨酸氨基转移酶水平均分别得到了一定改善(P0.05);治疗2周时,观察组血清总胆红素及“黄染、皮肤瘙痒、乏力、纳差”证候积分与对照组比较均差异具有统计学意义(P<0.05)。结论经皮肝穿刺胆管引流后运用加味茵陈黄柴汤治疗可进一步退黄,并改善患者症状。

关键词：加味茵陈黄柴汤恶性梗阻性黄疸中医证候积分

Experimental Investigation and Prediction Model of the Loads Exerted by Oblique Internal Solitary Waves on FPSO

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China Ocean Engineering 2022年第2期36卷 179-190页

作者： ZHANG Rui-rui WANG Hong-wei CHEN Ke YOU Yun-xiang ZHANG Shu-guang xiong xiao-hu Jiangsu University of Science and Technology Zhenjiang 212003China State Key Laboratory of Ocean Engineering Shanghai Jiaotong UniversityShanghai 200240China China Ship Development and Design Center(Shanghai) Shanghai 201108China SJTU Yazhou Bay Institute of Deep-sea Technology Sanya 572000China Dayang Offshore Equipment Co. LtdNanjing 210032China

By using a 30-meter-long wave flume equipped with a double-plate wave maker,a series of depression ISWs were generated in a density stratified two-layer fluid and the forces exerted by oblique internal solitary waves(ISWs)on fixed FPSO model had been *** to the laboratory experiments,a numerical flume taken the applicability of KdV,eKdV and MCC ISWs theories in consideration was adopted to study the force *** on the experimental data and the force composition,the simplified prediction model was *** was shown that the horizontal and transversal loads consisted of two parts:the Froude−Krylov force that could be calculated by integrating the dynamic pressure induced by ISW along the FPSO wetted surface,as well as the viscous force that could be obtained by multiplying the friction coefficient Cfx(C_(fy)),correction factor K_(x)(K_(y))and the integration of particle tangential velocity along the FPSO wetted *** vertical load was mainly the vertical Froude−Krylov *** on the experimental results,a conclusion can be drawn that the friction coefficient Cf and correction factor K were regressed as a relationship of Reynolds number Re,Keulegan-Carpenter number KC,upper layer depth h1/h and ISW accident angleα.Moreover,the horizontal friction coefficient Cfx yielded the logarithmic function with Re,and transversal friction coefficient C_(fy)obeyed the exponent function with Re,while the correction factors K_(x)and K_(y)followed power function with *** force prediction was also performed based on the regression formulae and pressure *** predicted results agreed well with the experimental *** maximum forces increase linearly with the ISWs ***,the upper layer thickness had an obvious influence on the extreme value of the horizontal and transversal forces.

关键词： internal solitary wave(ISW) FPSO wave forces friction coefficient and correction factor accident angle