检索结果-南通市图书馆

Effects of AlCoCrFeNiTi high-entropy alloy on microstructure and mechanical properties of pure aluminum

Journal of Materials Science & Technology 2020年第17期52卷 1-11页

作者： Qinglin Li Shang Zhao Xuepeng Bao Yushi Zhang Yuqian Zhu Chuangzao Wang yefeng lan Yuxin Zhang Tiandong Xia School of Materials Science and Engineering Lanzhou University of TechnologyLanzhou 730050China State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals Lanzhou University of TechnologyLanzhou 730050China

A new kind of AlCoCrFeNiTi high-entropy alloy(HEA)as a grain refiner was prepared by vacuum arc *** this work,the effects of HEA(1.0 wt.%,2.0 wt.%and 3.0 wt.%)on the microstructure and mechanical properties of pure aluminum were *** microstructure was characterized and examined by scanning electron microscope(SEM),energy dispersive X-ray spectroscopy(EDS),X-ray diffraction(XRD),electron probe micro-analyzer(EPMA)and transmission electron microscopy(TEM)to indicate the refining abilities and mechanism of HEA on pure *** show that the addition of HEA refined both the macrostructure and microstructure of pure *** 1.0 wt.%HEA was added,most coarse columnar grains were refined into equiaxed crystals,and as the amount of HEA increased to 2.0 wt.%and3.0 wt.%,aluminum grains were further refined,and the grain boundaries were nearly ***,the morphology ofα-Al transformed from coarse columnar crystals to equiaxed grains,and the mean size ofα-Al grains decreased from 374μm to 27μ*** Al3Ti,Al3Ni,and nano-phase precipitated from the aluminum alloy with HEA in the *** typical rod-like nano-phases distributed interdendritic regions ofα-*** average length of nano-phases is 2568 nm,4372 nm,and 6907 nm and the average diameter is 112 nm,103 nm,and 92 nm when 1.0 wt.%,2.0 wt.%and 3.0 wt.%HEA were added to the pure aluminum,*** ultimate tensile strength(UTS)and yield strength(YS)were improved in all samples,whereas the elongation(El)was decreased with increasing HEA *** 3.0 wt.%HEA was added into the aluminum melt,the UTS was improved by 145.2%from62 MPa to 152 MPa,the YS was increased by 173.8%from 42 MPa to 115 MPa,and the El was decreased by 33.3%from 39%to 26%.

关键词： Pure aluminum High-entropy alloy α-Al phases Nano-phases Mechanical properties

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

连铸二次冷却过程建模与参数分析

引用

热加工工艺 2008年第21期37卷 61-64页

作者：兰晔峰张保林李慧春兰州理工大学材料科学与工程学院甘肃兰州730050

二次冷却与铸机产量和铸坯质量密切相关。在其它工艺条件不变时,二冷强度增加,拉速增大,则生产效率提高;同时二次冷却对铸坯质量也有重要影响。连铸坯内部裂纹、表面裂纹、鼓肚和菱变、中心偏析等缺陷的形成与二次冷却有着紧密的联系,... 详细信息

二次冷却与铸机产量和铸坯质量密切相关。在其它工艺条件不变时,二冷强度增加,拉速增大,则生产效率提高;同时二次冷却对铸坯质量也有重要影响。连铸坯内部裂纹、表面裂纹、鼓肚和菱变、中心偏析等缺陷的形成与二次冷却有着紧密的联系,优化和控制二次冷却十分重要。连铸技术的发展对二冷水量的自动控制提出了越来越高的要求。

关键词：连铸圆坯数学模型二次冷却

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

连铸圆坯凝固传热过程的数值模拟

引用

热加工工艺 2008年第9期37卷 35-37,40页

作者：李慧春兰晔峰张保林兰州理工大学材料科学与工程学院甘肃兰州730050

研究和开发了连铸凝固传热过程数值模拟程序,并以圆铸坯为研究对象,计算了铸坯表面温度分布和凝固壳厚度,用该模型处理了凝固时相变所产生的结晶潜热。结果表明,计算出的表面温度、坯壳厚度等数据与实验数据相符合,并且对生产实践有较... 详细信息

研究和开发了连铸凝固传热过程数值模拟程序,并以圆铸坯为研究对象,计算了铸坯表面温度分布和凝固壳厚度,用该模型处理了凝固时相变所产生的结晶潜热。结果表明,计算出的表面温度、坯壳厚度等数据与实验数据相符合,并且对生产实践有较好的指导作用。它可用来优化连铸工艺参数,是进一步开发在线控制模型的基础。

关键词：连铸圆坯数学模型坯壳厚度

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

原位反应制备TiB_2颗粒增强Al-Si基复合材料的研究

引用

热加工工艺 2011年第4期40卷 63-66页

作者：兰晔峰王强强李庆林郭晶兰州理工大学甘肃省有色金属新材料重点实验室甘肃兰州730050 兰州理工大学有色金属合金及加工教育部重点实验室甘肃兰州730050

采用Al-TiO2-KBF4-Na3AlF6为反应体系,通过热力学分析,用熔体直接反应法制备了TiB2/Al-18%Si复合材料,运用XRD、OM、EPMA、SEM和硬度仪等对该复合材料的物相、颗粒分布、显微组织及硬度进行了分析。结果表明:该复合材料主要由Al、Si和T... 详细信息

采用Al-TiO2-KBF4-Na3AlF6为反应体系,通过热力学分析,用熔体直接反应法制备了TiB2/Al-18%Si复合材料,运用XRD、OM、EPMA、SEM和硬度仪等对该复合材料的物相、颗粒分布、显微组织及硬度进行了分析。结果表明:该复合材料主要由Al、Si和TiB2相组成;原位内生的TiB2颗粒细小(<1.0μm),并均匀弥散分布于Al-18%Si基体中;与基体合金相比,复合材料的硬度明显提高。

关键词：原位反应 TiB2颗粒 Al-Si基复合材料微观组织

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Catalytic detoxification of mitoxantrone by graphitic carbon nitride(g-C_(3)N_(4))supported Fe/Pd bimetallic nanoparticles

引用

Journal of Environmental Sciences 2025年第2期148卷 614-624页

作者： Qianyu Xu Haoyang Fu Jiyuan Gu Liyu Lei lan Ling State Key Laboratory for Pollution Control and Resource Reuse College of Environmental Science and EngineeringTongji UniversityShanghai 200092China

The overuse of antibiotics and antitumor drugs has resulted in more and more extensive pollution of water bodies with organic drugs,causing detrimental ecological effects,which have attracted attention towards effective and sustainable methods for antibiotics and antitumor drug ***,the hybrid nanomaterial(g-C_(3)N_(4)@Fe/Pd)was synthesized and used to remove a kind of both an antibiotic and antitumor drug named mitoxantrone(MTX)with 92.0%removal efficiency,and the MTX removal capacity is 450 mg/*** exposing to the hybrid material the MTX aqueous solution changed color from dark blue to lighter progressively,and LC-UV results of residual solutions showthat a newpeak at 3.0min(MTX:13.2min)after removal by g-C_(3)N_(4)@Fe/Pd appears,with the simultaneous detection of intermediate products indicating that g-C_(3)N_(4)@Fe/Pd indeed degrades *** mass spectrometric analysis suggests that the nuclear mass ratio decreased from 445.2(M+1H)to 126.0(M+1H),169.1(M+1H),239.2(M+1H),267.3(M+1H),285.2(M+1H),371.4(M+1H)and 415.2(M+1H),and the maximum proportion(5.63%)substance of all degradation products(126.0(M+1H))is 40-100 times less toxic than MTX.A mechanism for the removal and degradation of mitoxantrone was ***,actual water experiments confirmed that the maximum removal capacity of MTX by g-C_(3)N_(4)@Fe/Pd is up to 492.4 mg/g(0.02 g/L,10 ppm).

关键词： Degradation LC-QTOF-MS Nanoparticles Mitoxantrone Aqueous solution

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Tuning the interfacial reaction environment via pH-dependent and induced ions to understand C–N bonds coupling performance in NO_(3)-integrated CO_(2)reduction to carbon and nitrogen compounds over dual Cu-based N-doped carbon catalyst

引用

Journal of Energy Chemistry 2025年第1期100卷 273-285页

作者： Tianhang Zhou Chen Shen Zhenghao Wu Xingying lan Yi Xiao College of Carbon Neutrality Future Technology State Key Laboratory of Heavy Oil ProcessingChina University of Petroleum(Beijing)Beijing 102249China Department of Mechanical and Mechatronics Engineering and Waterloo Institute of Nanotechnology University of Waterloo WaterlooOntario N2L 3G1Canada Institute of Materials Science TU DarmstadtDarmstadt 64287Germany Department of Chemistry Xi’an Jiaotong-Liverpool UniversitySuzhou 215123JiangsuChina

Dual atomic catalysts(DAC),particularly copper(Cu_(2))-based nitrogen(N)doped graphene,show great potential to effectively convert CO_(2)and nitrate(NO_(3)-)into important industrial chemicals such as ethylene,glycol,acetamide,and urea through an efficient catalytical process that involves C–C and C–N ***,the origin of the coupling activity remained unclear,which substantially hinders the rational design of Cu-based catalysts for the N-integrated CO_(2)reduction reaction(CO_(2)RR).To address this challenge,this work performed advanced density functional theory calculations incorporating explicit solvation based on a Cu_(2)-based N-doped carbon(Cu_(2)N_(6)C_(10))catalyst for CO_(2)*** calculations are aimed to gain insight into the reaction mechanisms for the synthesis of ethylene,acetamide,and urea via coupling in the interfacial reaction *** to the sluggishness of CO_(2),the formation of a solvation electric layer by anions(F^(-),Cl^(-),Br^(-),and I^(-))and cations(Na+,Mg^(2+),K+,and Ca^(2+))leads to electron transfer towards the Cu *** process significantly accelerates the reduction of CO_(2).These results reveal that*CO intermediates play a pivotal role in N-integrated CO_(2)***,the Cu_(2)-based N-doped carbon catalyst examined in this study has demonstrated the most potential for C–N coupling to *** findings reveal that through the process of a condensation reaction between*CO and NH_(2)OH for urea synthesis,*NO_(3)-is reduced to*NH_(3),and*CO_(2)to*CCO at dual Cu atom *** dual-site reduction facilitates the synthesis of acetamide through a nucleophilic reaction between NH_(3)and the ketene ***,we found that the I-and Mg^(2+)ions,influenced by pH,were highly effective for acetamide and ammonia synthesis,except when F-and Ca^(2+)were ***,the mechanisms of C–N bond formation were investigated via ab-initio molecular dynamics simulations,and we found that adjusti

关键词： pH-dependent micro-environments C-N coupling N-integrated CO_(2)RR Dual Cu-based nitrogen carbon catalysts Explicit solvation model lon stabilizer AIMD

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Laser image refractive index sensor based on the combination of a coreless optical fiber and a digital camera

引用

Optoelectronics Letters 2025年第2期21卷 65-68页

作者： GUO Jingzhong lan Feng CHEN Xiang LIU Haifeng Xi’an Institute of Space Radio Technology Xi’an 710100China Key Laboratory of Optoelectronic Sensor and Sensing Network Technology College of Electronic Information and Optical EngineeringNankai UniversityTianjin 300350China

As a laser passes through a scattering medium,the light interacts with the irregular reflections within the medium,resulting in light scattering and the formation of *** this paper,an image sensor based on the combination of a coreless optical fiber and a digital camera is proposed for liquid refractive index sensing *** coreless fiber is used as a sensing unit,and the change in the speckle pattern is measured using the digital correlation method to detect the magnitude of the liquid's refractive *** experimental results indicate that the laser image sensing technique is capable of effectively distinguishing liquid samples with refractive indices ranging from 1.332 8 to1.390 8,with a sensing sensitivity of-1.306 ***,the laser image sensing technique,with its advantages of high experimental reproducibility,simple system design,remote over-control,holds great research significance and potential application in laser communication and sensor integration.

关键词： fiber scattering optical

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

糖精和1,4-丁炔二醇对镀镍层形貌的影响

引用

电镀与精饰 2015年第6期37卷 10-13,22页

作者：兰晔峰李富斌赵文军李庆林兰州理工大学材料科学与工程学院甘肃兰州730050

采用动电位扫描、扫描电子显微镜和X-射线衍射分析分别研究了不同质量浓度的糖精和1,4-丁炔二醇对镍电沉积层的极化作用、表面形貌及晶体取向的影响。结果表明:在瓦特镀镍液中加入糖精和1,4-丁炔二醇,极化曲线均向负电位方向移动。糖精... 详细信息

采用动电位扫描、扫描电子显微镜和X-射线衍射分析分别研究了不同质量浓度的糖精和1,4-丁炔二醇对镍电沉积层的极化作用、表面形貌及晶体取向的影响。结果表明:在瓦特镀镍液中加入糖精和1,4-丁炔二醇,极化曲线均向负电位方向移动。糖精质量浓度增加至2.0 g/L时,极化曲线不再向负电位方向移动,镀层呈现(200)面择优取向。当1,4-丁炔二醇质量浓度增加到0.5 g/L时,其显著提高了镍电沉积过电位230 m V,有效增大成核密度,其镀层微观形貌平整均匀,择优取向并未发生改变。

关键词：镍电沉积糖精 1,4-丁炔二醇阴极极化

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Trigonelline exerts its neuroprotective effects in experimental spinal cord injury through modulation of inflammation, apoptosis, and neurotrophic factors

引用

Asian Pacific Journal of Tropical Biomedicine 2025年第1期15卷 34-42页

作者： Zhi-lan Ye Yuan Cao Department of Rehabilitation Jingdezhen Hospital of Traditional Chinese MedicineJingdezhen333000China Department of Neurosurgery General Hospital of Northern Theater CommandShenyang110000China

Objective:To assess the protective effects of trigonelline against spinal cord injury(SCI)in ***:Rats(Sprague-Dawley,male)were randomly assigned to seven groups(n=15 per group):normal,sham,SCI control(1%DMSO),methylprednisolone(30 mg/kg),and trigonelline(50,100,and 200 mg/kg).Rats received respective treatment daily for 28 *** was induced by using a temporary aneurysm ***,biochemical,and histological analyses were performed to investigate the neuroprotective effect of ***:Trigonelline(100 and 200 mg/kg)treatment effectively(P<0.05)mitigated SCI-induced changes in mechano-tactile sensation,allodynia,hyperalgesia,and motor nerve conduction *** notably(P<0.05)downregulated apoptotic(Bax and caspase-3)and inflammatory(COX-Ⅱ)markers,while upregulating Bcl-2 and BDNF mRNA expression in the spinal cord(P<0.05).Furthermore,trigonelline effectively alleviated(P<0.05)SCI-induced alterations in mitochondrial complex levels,resulting in enhanced nicotinamide adenine dinucleotide dehydrogenase,succinate dehydrogenase,redox activity,and cytochrome-C *** examination of spinal cord tissue indicated that trigonelline significantly(P<0.05)ameliorated the histological damage caused by SCI,thereby improving neuronal degeneration,inflammatory cell infiltration,and ***:Trigonelline shows neuroprotective properties in SCI rats by reducing allodynia,hyperalgesia,and inflammation,stabilizing mitochondrial enzyme complexes,and modulating apoptotic and neurotrophic ***,trigonelline holds promise as a potential neuroprotective agent.

关键词： Bax Bcl-2 BDNF COX-Ⅱ Spinal cord injury Trigonelline

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Exploring the effects of perception factors on evacuation intentions of residents

引用

Journal of Mountain Science 2025年第2期22卷 592-610页

作者： TANG lan ZHOU Jiawen ZHOU langyu XING Huige College of Architecture and Environment Sichuan UniversityChengdu 610065China State Key Laboratory of Hydraulics and Mountain River Engineering Sichuan UniversityChengdu 610065China Institute for Disaster Management and Reconstruction Sichuan University-Hong Kong Polytechnic UniversityChengdu 610207China

The evacuation of people under threat is an effective disaster prevention and mitigation measure in response to flash floods and geological hazards,and it is also an essential element of pre-disaster ***,the effect of the interactions between perception factors on residents'willingness to evacuate is an urgent problem to be ***,this paper introduces risk,stakeholder,and protective action perceptions from the protective action decision model as the main explanatory *** three core perceptions are subdivided into affective risk perception,cognitive risk perception,government perception,other-stakeholder perception,resourcerelated attributes,and hazard-related attributes.A questionnaire survey was conducted from June to July 2023 among residents of mountainous communities in nine villages in three towns in Sichuan Province,China.359 cross-sectional data were analyzed using structural equation modeling to explore the effects of six perception factors on evacuation *** results of the study showed that:(1)affective risk perception,government perception,other-stakeholder perception,and hazard-related attributes all directly and positively influence residents'intentions to evacuate;(2)cognitive risk perception is mediated by stakeholder and protective action perceptions,which indirectly and positively affect residents'intentions to *** on the hypothesized paths,strategies to improve residents'willingness to evacuate are discussed from the perspective of three core perceptions:strengthening disaster risk education,improving residents'cohesion,and building government *** results of this study can provide theoretical support and practical suggestions for emergency management departments to formulate emergency evacuation strategies,which can aid decision-makers in better understanding residents'intentions to evacuate,optimizing evacuation information dissemination pathways,and strengthening disaster risk man

关键词： Disaster prevention and mitigation Evacuation intentions Flash floods and geological hazards Protective action decision model Perception factors Structural equation modeling

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：