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Effect of ball milling time on the microstructure and compressive properties of the Fe–Mn–Al porous steel

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International Journal of Minerals,Metallurgy and Materials 2023年第5期30卷 917-929页

作者： lingzhi xie Zhigang Xu Yunzhe Qi Jinrong Liang Peng He Qiang Shen Chuanbin Wang Hubei Key Laboratory of Advanced Technology for Automotive Components Wuhan University of TechnologyWuhan 430070China School of Materials Science and Engineering Wuhan University of TechnologyWuhan 430070China State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Wuhan Second Ship Design and Research Institute Wuhan 430205China

In the present work,Fe–Mn–Al–C powder mixtures were manufactured by elemental powders with different ball milling time,and the porous high-Mn and high-Al steel was fabricated by powder sintering.The results indicated that the powder size significantly decreased,and the morphology of the Fe powder tended to be increasingly flat as the milling time increased.However,the prolonged milling duration had limited impact on the phase transition of the powder mixture.The main phases of all the samples sintered at 640℃ were α-Fe,α-Mn and Al,and a small amount of Fe2Al5 and Al8Mn5.When the sintering temperature increased to 1200℃,the phase composition was mainly comprised of γ-Fe and α-Fe.The weight loss fraction of the sintered sample decreased with milling time,i.e.,8.3wt% after 20 h milling compared to15.3wt% for 10 h.The Mn depletion region(MDR) for the 10,15,and 20 h milled samples was about 780,600,and 370 μm,respectively.The total porosity of samples sintered at 640℃ decreased from ~46.6vol% for the 10 h milled powder to ~44.2vol% for 20 h milled powder.After sintering at 1200℃,the total porosity of sintered samples prepared by 10 and 20 h milled powder was ~58.3vol% and ~51.3vol%,respectively.The compressive strength and ductility of the 1200℃ sintered porous steel increased as the milling time increased.

关键词： powder metallurgy porous steel ball milling time microstructure evolution compressive properties

Analysis of the Impact Resistance of Photovoltaic Panels Based on the Effective Thickness Method

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Journal of Renewable Materials 2022年第1期10卷 33-51页

作者： Jian Gong lingzhi xie Yongxue Li Zhichun Ni Qingzhu Wei Yupeng Wu Haonan Cheng College of Architecture and Environment Sichuan UniversityChengdu610065China Institute of New Energy and Low-Carbon Technology Sichuan UniversityChengdu610207China Suzhou Talesun Solar Technologies Co. Ltd.Suzhou215542China Department of Architecture and Built Environment Faculty of EngineeringUniversity of NottinghamUniversity ParkNottinghamNG72RDUK National Photovoltaic Product Quality Supervision and Inspection Center Chengdu610065China

Based on the recent development of renewable energy utilization technology,in addition to centralized photovol-taic power plants,distributed photovoltaic power generation systems represented by building-integrated photo-voltaic systems are frequently employed for power supply.Therefore,in the architectural design,the double-glass photovoltaic module used in the integrated photovoltaic building system puts forward a higher load-bearing capa-city requirement and the corresponding simplified method of carrying capacity check.This article focuses on the simplified method of checking the bearing capacity of the four-sided simply supported double-glass photovoltaic module.First,the principle of equivalent stiffness is used to calculate the effective thickness.Then,the rationality of this approach is verified by comparing the bending states of sandwich panels under different shear moduli.The double-glass photovoltaic module is equivalent to a single-layer board,and its effectiveness is verified by compar-ing the impact test results of the double-glass photovoltaic module with the results of the single-layer board.But the comparison with the test results shows that,from the perspective of architectural design,the effective thick-ness results in this paper can ensure that the building structure has sufficient bearing capacity,but the four-side simply supported boundary theory cannot fully reflect the calculation of the bearing capacity of the four-side clamped double-glass photovoltaic module.

关键词： Double-glass photovoltaic module dynamic stiffness characteristics natural frequency effective thickness impact test

Scientific and Engineering Progress in CO_2 Minerali zation Using Industrial Waste and Natural Minerals

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Engineering 2015年第1期1卷 150-157页

作者： Heping xie Hairong Yue Jiahua Zhu Bin Liang Chun Li Yufei Wang lingzhi xie Xiangge Zhou Center of CCUS and CO2 Mineralization and Utilization Sichuan University College of Water Resources & Hydropower Sichuan University College of Chemical Engineering Sichuan University School of Chemistry Sichuan University

The issues of reducing CO_2 levels in the atmo-sphere, sustainably utilizing natural mineral resources,and dealing with indus trial waste offer challenging opportunities for sustainable development in energy and the environment. The latest advances in CO_2 mineralization technology involving natural minerals and industrial waste are summarized in this paper, with great emphasis on the advancement of fundamental science, economic evaluation, and engineering applications. We discuss several lead-ing large-scale CO_2 mineralization methodologies from a techn ical and engineering-science perspective. For each technology option, we give an overview of the technical parameters, reaction pathway, reactivity, procedural scheme, and laboratorial and pilot devices. Furthermore, we present a discussion of each technology based on experimental results and the literature. Finally, current gaps in knowledge are identified in the conclusion, and an overview of the challenges and opportunities for future research in this field is provided.

关键词：大气二氧化碳基础科学工程科学天然矿物工业废物碳矿化技术参数可持续利用

不对称联盟管理的弱国议价机制——以美国联盟体系为例

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世界经济与政治 2022年第8期 130-153,159,160页

作者：王雄发谢凌志暨南大学国际关系学院/华人华侨研究院广州510632 新疆大学政治与公共管理学院乌鲁木齐830046

联盟管理本质上是联盟成员为实现自身效益最大化同对方议价的动态过程。美国联盟体系中曾出现一些相对弱势的联盟成员冒着得罪美国的风险同联盟所针对的第三方国家进行军备贸易的反常现象,理解这一现象需要厘清不对称联盟管理中弱国与... 详细信息

联盟管理本质上是联盟成员为实现自身效益最大化同对方议价的动态过程。美国联盟体系中曾出现一些相对弱势的联盟成员冒着得罪美国的风险同联盟所针对的第三方国家进行军备贸易的反常现象,理解这一现象需要厘清不对称联盟管理中弱国与强国议价时的策略选择及因果条件。在既有研究基础上,作者提出关于不对称联盟管理中弱国议价机制的分析框架,认为弱国发射的议价信号可分为直接对抗和间接对抗两种类型,前者是弱国坚决维护自身利益的行为,后者是弱国维护自身利益的意志薄弱行为。弱国的选择受联盟地位和利益分歧影响:联盟地位低的弱国倾向于在利益分歧大时向强国发射直接对抗信号,在利益分歧小时向强国发射间接对抗信号;联盟地位高的弱国在议价信号选择上受利益分歧影响不明显,无论利益分歧大小此类弱国均倾向于向强国发射间接对抗信号。对美土同盟、美泰同盟、美法同盟和美以同盟四个案例的经验检验发现,仅有土耳其(2014—2019年)和泰国的敏感性军备贸易成功完成,即向美国发射了直接对抗信号;而土耳其(2011—2013年)、法国和以色列的敏感性军备贸易以失败告终,即向美国发射了间接对抗信号。在美国联盟体系中联盟地位低且同美国利益分歧大的国家是中国分化美国联盟体系、缓解美国对华战略压力的理性选择对象。

关键词：联盟管理美国联盟体系军备贸易议价机制信号博弈

Simultaneous mineralization of CO_2 and recovery of soluble potassium using earth-abundant potassium feldspar

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Chinese Science Bulletin 2013年第1期58卷 128-132页

作者： xie HePing WANG YuFei JU Yang LIANG Bin ZHU JiaHua ZHANG Ru xie lingzhi LIU Tao ZHOU XiangGe ZENG HongMei LI Chun LU HouFang Center of CCUS and CO_2 Mineralization and Utilization Sichuan University Key Laboratory of Energy Engineering Safety and Mechanics on Disasters The Ministry of EducationSichuan University State Key Laboratory of Coal Resources and Safe Mining China University of Mining Technology School of Chemical Engineering Sichuan University School of Chemistry Sichuan University

CO2 capture and storage(CCS) is an important strategy in combatting anthropogenic climate change.However,commercial application of the CCS technique is currently hampered by its high energy expenditure and costs.To overcome this issue,CO2 capture and utilization(CCU) is a promising CO2 disposal method.We,for the first time,developed a promising method to mineralize CO2 using earth-abundant potassium feldspar in order to effectively reduce CO2 emissions.Our experiments demonstrate that,after adding calcium chloride hexahydrate as an additive,the K-feldspar can be transformed to Ca-silicates at 800 C,which can easily mineralize CO2 to form stable calcium carbonate and recover soluble potassium.The conversion of this process reached 84.7%.With further study,the pretreatment temperature can be reduced to 250 C using hydrothermal method by adding the solution of triethanolamine(TEA).The highest conversion can be reached 40.1%.The process of simultaneous mineralization of CO2 and recovery of soluble potassium can be easily implemented in practice and may provide an economically feasible way to tackle global anthropogenic climate change.

关键词：水溶性钾 CO2 钾长石矿化恢复使用地球二氧化碳气候变化

短链脂肪酸在食物过敏中的免疫调节作用研究进展

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中国免疫学杂志 2024年第7期40卷 1553-1558页

作者：于泳璐谢海徐灵芝山东第二医科大学基础医学院山东省高等学校免疫微环境与炎症性疾病研究特色实验室潍坊261053

食物过敏(FA)是一种潜在致命的免疫病理反应,其发病率持续上升,已成为影响儿童和成人的重要公共卫生问题。肠道厌氧共生细菌通过发酵代谢膳食纤维产生的短链脂肪酸(SCFAs)发挥重要的免疫调节功能,参与FA的发生与发展。本综述将在FA的背... 详细信息

食物过敏(FA)是一种潜在致命的免疫病理反应,其发病率持续上升,已成为影响儿童和成人的重要公共卫生问题。肠道厌氧共生细菌通过发酵代谢膳食纤维产生的短链脂肪酸(SCFAs)发挥重要的免疫调节功能,参与FA的发生与发展。本综述将在FA的背景下讨论SCFAs对肠上皮细胞及多种免疫细胞的免疫调节作用及相关分子机制,以期为FA的预防和治疗提供新思路。

关键词：短链脂肪酸食物过敏肠上皮细胞免疫细胞免疫调节

不同亲水性能的纤维对混凝土抗冻耐久性的影响

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四川大学学报（工程科学版） 2016年第2期48卷 225-230页

作者：何柏谢凌志刘泉张生四川大学能源工程安全与灾害力学教育部重点实验室四川成都610065 四川大学新能源与低碳技术研究院四川成都610207 四川省交通勘察设计研究院四川成都610017

为了研究不同亲水性能的纤维对混凝土抗冻性能的影响规律,选择3种不同回潮率的纤维,采用快冻法对纤维混凝土的抗冻耐久性进行试验研究;分析不同纤维混凝土的冻融损伤规律,以及回潮率对其冻融损伤的影响。利用SEM对冻融前后纤维-水泥石... 详细信息

为了研究不同亲水性能的纤维对混凝土抗冻性能的影响规律,选择3种不同回潮率的纤维,采用快冻法对纤维混凝土的抗冻耐久性进行试验研究;分析不同纤维混凝土的冻融损伤规律,以及回潮率对其冻融损伤的影响。利用SEM对冻融前后纤维-水泥石基体进行了观测,进一步探讨纤维亲水性对混凝土抗冻性能的影响机理。结果表明,亲水性良好的纤维能够与水泥石更好的共同作用,有效抑制混凝土内部初期微缺陷及冻融过程中微缺陷的生长;而疏水性纤维难以与水泥石难以形成有效的共同作用体系,对于冻融循环过程中微缺陷的生长抑制能力较弱,其纤维-水泥石之间的薄弱带甚至可能会加速混凝土的冻融损伤;且随着冻融循环次数的增加,纤维的亲水性对混凝土的抗冻性能影响愈加明显。

关键词：亲水性疏水性冻融回潮率纤维混凝土

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风城油砂三轴力学特性及其本构模型研究

四川大学学报（工程科学版） 2015年第5期47卷 1-9页

作者：王俊谢凌志谢和平李存宝四川大学建筑与环境学院四川成都610065 四川大学能源工程安全与灾害力学教育部重点试验室四川成都610065 四川大学新能源与低碳技术研究院四川成都610065

油砂是一种具有自锁结构的致密沉积砂,其力学特性较疏松砂岩更为复杂。针对新疆克拉玛依风城油砂矿的储层岩芯,利用MTS 815试验系统开展室温三轴固结排水压缩试验,探讨了油砂在不同围压下的三轴力学特性。结果表明,典型的油砂应力–应... 详细信息

油砂是一种具有自锁结构的致密沉积砂,其力学特性较疏松砂岩更为复杂。针对新疆克拉玛依风城油砂矿的储层岩芯,利用MTS 815试验系统开展室温三轴固结排水压缩试验,探讨了油砂在不同围压下的三轴力学特性。结果表明,典型的油砂应力–应变关系呈驼峰曲线,存在应变软化与剪胀现象;试验边界条件与围压对油砂力学特性具有重大影响,并决定了其破坏模式及峰后软化行为;油砂变形模量、泊松比在对数坐标下与围压存在线性关系,低围压时抗剪强度近似服从莫尔–库伦准则。借鉴南水非线性模型及成都科大模型,分别讨论了风城油砂的应力应变本构关系,在此基础上修正得到新的推广双曲线模型,指出修正的成都科大模型较南水模型能更好地描述油砂的应变软化特性,也能适当地考虑剪胀效应,以期为深入研究中国本土油砂的力学特性及石油工程应用提供指导。

关键词：油砂三轴试验应变软化本构模型

急性冠脉综合征中糖代谢异常与血浆P选择素、冠脉病变程度的关系

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江苏医药 2009年第3期35卷 285-287页

作者：谢灵芝施毕旻苏州大学附属第一医院内分泌病科 215006

目的探讨急性冠脉综合征(ACS)患者血糖异常与血浆P选择素和冠状动脉病变程度的关系。方法ACS患者116例,其中单纯ACS组40例、ACS合并糖调节异常组(糖耐量受损组/空腹血糖受损)34例、ACS合并2型糖尿病组42例,单纯2型糖尿病组26例,正常对照... 详细信息

目的探讨急性冠脉综合征(ACS)患者血糖异常与血浆P选择素和冠状动脉病变程度的关系。方法ACS患者116例,其中单纯ACS组40例、ACS合并糖调节异常组(糖耐量受损组/空腹血糖受损)34例、ACS合并2型糖尿病组42例,单纯2型糖尿病组26例,正常对照组26例。采用ELISA法测定各组血浆可溶性P选择素水平。结果单纯ACS组、ACS合并糖调节异常组、ACS合并2型糖尿病组、单纯2型糖尿病组P选择素水平均高于正常对照组,其中ACS合并糖调节异常组、ACS合并2型糖尿病组P选择素水平均高于单纯ACS组(P<0.05)。ACS合并糖调节异常组以及ACS合并2型糖尿病组多支冠状动脉病变的发生率以及冠状动脉狭窄的严重程度均明显高于单纯ACS组(P<0.05)。结论糖代谢紊乱的ACS患者较糖耐量正常的ACS患者具有更严重的血小板活化状态。ACS合并糖代谢异常患者冠脉病变程度更严重、范围更广泛,临床预后更差。

关键词： P选择素急性冠脉综合征糖尿病