检索结果-内蒙古大学图书馆

Realizing impressive superplasticity in a low-alloyed Mg-Zn-Ca-Al-Mn alloy:The roles of grain boundary segregation and denseβ-Mn particles

引用

Journal of Magnesium and Alloys 2024年第10期12卷 4085-4095页

作者： Tian-Shuai Wang Zhen-Ming Hua Cheng Wang Min Zha Yipeng Gao Hui-Yuan Wang Key Laboratory of Automobile Materials of Ministry of Education&School of Materials Science and Engineering Nanling CampusJilin UniversityNo.5988 Renmin StreetChangchun 130025PR China International Center of Future Science Jilin UniversityChangchun 130012PR China State Key Laboratory of Reliability and Intelligence of Electrical Equipment School of Material Science and EngineeringHebei University of TechnologyTianjin 300130PR China

Achieving impressive superplasticity is an important strategy to manufacture Mg alloy products with complex *** the present study,we report that an excellent superplastic deformation with elongation larger than 500%can be achieved at 623 K and 1.0×10^(−3)s^(−1)in a Mg-1.51Zn-0.59Ca-0.59Al-0.70Mn(wt.%,ZXAM2111)alloy fabricated by equal-channel angular *** superplastic deformation is mainly carried by grain boundary sliding(GBS),accompanied by a grain size growth from∼3.0μm to∼6.0μm after *** deformation,the ZXAM2111 alloy is mainly characterized by a strong co-segregation of Zn and Ca atoms at grain boundaries and uniformly distributedβ-Mn *** deformation proceeding,theβ-Mn particles further dynamically precipitate along grain boundaries that parallel the tensile axis,leading to improved resistance to grain *** the enhanced stabilizing effects decrease the strain rate sensitivity value,the resulting impressive microstructure stability provides a cornerstone of the active operation of GBS,facilitating the achievement of superplastic *** present work could provide insight into developing low-alloyed Mg alloys with high microstructure thermal stability to achieve superplasticity.

关键词： Magnesium alloys Superplasticity Solute segregation Thermal stability Grain boundary sliding

来源：评论

学校读者我要写书评

暂无评论

Climatic drivers of the Canadian wildfire episode in 2023

引用

Atmospheric and Oceanic Science Letters 2024年第4期17卷 23-28页

作者： Yihan Hu Xu Yue Chenguang Tian Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control Collaborative Innovation Center of Atmospheric Environment and Equipment TechnologySchool of Environmental Science and EngineeringNanjing University of Information Science&Technology(NUIST)NanjingChina

2023年5月加拿大发生极端野火事件并持续4个月时间.野火污染物排放对当地和下风向的空气质量造成了严重影响.本文对驱动此次野火事件的气象因子和相关大尺度环流进行了探究.研究表明,此次极端野火排放的二氧化碳相较往年同期增长了0.37G... 详细信息

2023年5月加拿大发生极端野火事件并持续4个月时间.野火污染物排放对当地和下风向的空气质量造成了严重影响.本文对驱动此次野火事件的气象因子和相关大尺度环流进行了探究.研究表明,此次极端野火排放的二氧化碳相较往年同期增长了0.37Gt (527.1%).受罗斯贝波频散影响,同期加拿大中西部区域出现持续的位势高度正异常,促进气流下沉并引发局地高温,中西部区域5-6月最高温平均上升8.11℃,部分区域甚至超过10℃,导致野火排放的显著增长.受有利地形和泛北极地区快速增暖的影响,预期未来加拿大中西部发生极端野火的概率可能会显著上升.

关键词：野火气候变化遥相关极端天气碳排放

来源：评论

学校读者我要写书评

暂无评论

Self-cleaning SERS sensor based on flexible Ni_(3)S_(2)/MoS_(2)@Ag@PDMS composites for label-free multiplex volatile organic compounds detection

引用

Nano Research 2024年第6期17卷 5529-5539页

作者： Xinyue Song Yongzheng Zhang Xiaohui Ren Dongyan Tang Xuelin Zhang Xin Li MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage School of Chemistry and Chemical EngineeringState Key Lab of Urban Water Resource and EnvironmentHarbin Institute of TechnologyHarbin 150090China College of Textile and Clothing Yancheng Institute of TechnologyYancheng 224051China MEMS Center Harbin Institute of TechnologyHarbin 150001China

Flexible self-cleaning surface-enhanced Raman scattering(SERS)sensors are highly desirable for the detection of various environmental pollutants,including volatile organic compounds(VOCs).However,achieving sensitive detection without labeling and ensuring efficient cyclic use remain significant ***,we introduce a direct approach to create a versatile Ni_(3)S_(2)/MoS_(2)@Ag@PDMS(PDMS=polydimethylsiloxane)composite SERS substrate using chemical vapor deposition *** produced substrate shows outstanding performance,offering extremely low detection sensitivity(1.0×10^(−12)M 4-aminobenzenethiol)and high enhancement factors(approximately 107).The interactions between the rod-shaped Ni_(3)S_(2)/MoS_(2)@Ag heterostructure and the molecules facilitate the transfer of charge,resulting in an increased electric field enhancement of the exciton *** has the dual benefit of providing a self-cleaning effect and enhancing SERS ***,the substrate enables sensitive detection of VOCs gas molecules without the need for labels,achieving a minimum detectable concentration as low as 1 ppm for o-dichlorobenzene,due to the preconcentration effect of *** calculations further explain the combined effect of electromagnetic and chemical enhancement in this composite *** utilizing the developed visual SERS barcode,quick multiple detection and analysis of mixtures can be *** flexible and versatile SERS technique has significant potential for on-site detection and analysis of environmental pollutants,opening the doors for the development of a wearable in-situ SERS sensing platform.

关键词： surface-enhanced Raman scattering(SERS) quantitative detection recyclable detection volatile organic compounds(VOCs) chemical vapor deposition(CVD)

来源：评论

学校读者我要写书评

暂无评论

Insights into effects of thermotolerant nitrifying and sulfur-oxidizing inoculants on nitrogen-sulfur co-metabolism in sewage sludge composting

引用

Journal of environmental Sciences 2024年第10期144卷 76-86页

作者： Tingting Hou Yujie Zhou Rongchun Du Jiali Liu Weiguang Li Shumei Zhang Muzi Li Junhong Chu Liqiang Meng Institute of Microbiology Heilongjiang Academy of SciencesHarbin 150010China Hebei University of Environmental Engineering Hebei Key Laboratory of Agroecological SafetyQinhuangdao 066102China School of Environment Harbin Institute of TechnologyHarbin 150090China

In this study,high temperature thermotolerant nitrifying bacteria(TNB)and high temperature thermotolerant sulfide oxidizing bacteria(TSOB)were obtained from compost samples and inoculated into sewage sludge(SS)*** effects of inoculation on physical and chemical parameters,ammonia and hydrogen sulfide release,nitrogen form and sulfur compound content change and physical-chemical properties during nitrogen and sulfur conversion were *** results showed that inoculation of TNB and TSOB increased the temperature,pH,OM degradation,C/N ratio and germination index(GI)of *** with the control treatment(CK),the addition of inoculants reduced the release of NH_(3) and H_(2)S,and transformed them into nitrogen and sulfur compounds,the hydrolysis of polymeric ferrous sulfate was promoted,resulting in relatively high content of sulfite and *** the same time,the physical and chemical properties of SS have a strong correlation with nitrogen and sulfur compounds.

关键词： Sewage sludge Composting Inoculation Thermotolerant nitrifying bacteria Thermotolerant sulfurized oxidizing bacteria

来源：评论

学校读者我要写书评

暂无评论

Fluid Simulation and reliability Evaluation for the Spacecraft Multilayer Insulation in the Rapid Pressure Relief Process of the Powered Phase

Fluid Simulation and Reliability Evaluation for the Spacecra...

引用

2022 Global reliability and Prognostics and Health Management Conference, PHM-Yantai 2022

作者： Fangyong, Li Shouqing, Huang Qizheng, Ji Hao, Wang Zhaolin, Zhang Qiang, Yu Beijing Institute of Spacecraft Environment Engineering Beijing Key Laboratory of Environment and Reliability Test Technology Aerospace Mechanical and Electrical Products Beijing China

ISBN: (数字)9781665496315

ISBN: (纸本)9781665496315

The multilayer insulation (MLI) fixed on the spacecraft surface as the most important thermal control approach may be damaged during the rapid pressure relief of the powered phase. The stress inconformity on each thin film may cause MLI failure with too much fluid pressure due to the rapid pressure relief. In this paper, the stress uniformity on the thin films in MLI was studied. The three-dimensional slice model of MLI was established. The stress distribution on each thin film in the rapid pressure relief process was analyzed by using computational fluid dynamics (CFD) method and the result showed the fluid stress on the thin film increases gradually from the inside to the outside. In consideration of the short time of the rapid pressure relief process during the powered phase, the steady model was adopted to product the reliability evaluation for the MLI where the fault is caused by transient stresses loading into the system. The result indicated that the reliability achieved to 0.955 when the MLI is sewed by 90mm×90mm. The simulation methods approached in this paper can be applied in the fluid stress analysis for other thermal control products and it can provide an effective technical approach for the environmental adaptability and reliability evaluation in the powered phase. © 2022 IEEE.

关键词： Stress analysis

来源：评论

学校读者我要写书评

暂无评论

Plastic quasicrystal-containing alloys prepared by annealing pseudo-high entropy Zr70-75(Al,Ni,Cu,Ag)25-30 glassy alloys

引用

材料科学技术（英文版） 2025年第5期208卷 1-10页

作者： Cong Liu Chen Yang Jing Ding Xiangxiang Jiang Hongzhi Luo Ao Guo Bingxiang Xu Xuefang Dai Shengli Zhu Guodong Liu State Key Laboratory of Reliability and Intelligence of Electrical Equipment School of Materials Science and EngineeringHebei University of TechnologyTianjin 300130China School of Energy and Machinery Dezhou UniversityDezhou 253023China School of Materials Science and Engineering Tianjin UniversityTianjin 300072China School of Materials Science and Engineering Lanzhou Jiaotong UniversityLanzhou 730070China

A glassy(G)phase was formed for Zr-rich Zr70-75(Al,Ni,Cu,Ag)25_30(atomic percent,at.％)melt-spun alloy *** glassy alloys exhibit the glass transition,followed by a supercooled liquid region and then three-stage *** glass transition temperature and the onset temperature for the first-stage crystallization(Tx1)decrease from 630 to 668 K,respectively for the 70Zr alloy to 619 and 652 K,respectively for the 75Zr *** first-stage exothermic peak is due to the precipitation of an icosahedral quasicrystal(IQ)*** IQ particle size decreases from 10 nm to 6 nm with increasing Zr content from 70 at.％to 74 at.％.The[G+IQ]phases change to Zr2Ni+Zr2(Cu,Ag)phases after the second exothermic peak and then Zr2Ni+Zr2(Cu,Ag)+Zr5Al3 phases after the third *** is noticed that the as-spun glassy alloy ribbons as well as the annealed[G+IQ]phase ribbons exhibit good bending ***,the 70Zr thicker ribbons also exhibit high tensile fracture strength of 1090-1187 MPa and plastic elongation of 0.17％-0.42％.The fracture mode is similar to that of ordinary bulk metallic *** Vickers hardness(Hv)is 480 for 70Zr alloy and decreases to 436 for 75Zr *** precipitation of IQ phase causes a significant increase in Hv to about *** formations of glassy alloys with high Zr contents of 70 at.％-75 at.％by melt spinning as well as the[G+IQ]phase alloys with good bending plasticity by annealing hold promise for the creation of a new type of engineering material,transcending mere academic novelty.

关键词： Pseudo-high entropy glassy alloy Icosahedral quasicrystal Plasticity Mechanical property

来源：评论

学校读者我要写书评

暂无评论

Energy conversion due to non-ideal electric field in separatrix region of magnetotail reconnection

引用

Earth and Planetary Physics 2024年第5期8卷 787-796页

作者： YiNan Liu Keizo Fujimoto JianQiang Wang XiaoChuan Duan School of Space and Environment Beihang UniversityBeijing 102206China Key Laboratory of Space Environment Monitoring and Information Processing Ministry of Industry and Information TechnologyBeijing 102206China School of Automation Science and Electrical Engineering Beihang UniversityBeijing 100191China

A recent satellite observation has revealed the presence of energy conversion in the separatrix region(SR)of magnetotail reconnection,driven by perpendicular *** investigated this phenomenon by means of particle-in-cell simulations in two-dimensional(2D)and three-dimensional(3D)*** result indicates that in the 2D simulation,energy conversion in the SR is dominated by parallel components,with the main influencing factor being the parallel electric field,which is not consistent with the ***,a case that is similar to the observation is found in the 3D simulation,suggesting that the observation result may be attributed to the 3D *** findings provide a potential explanation for the satellite observation.

关键词： magnetic reconnection energy conversion PIC simulation separatrix region

来源：评论

学校读者我要写书评

暂无评论

Enhanced energy storage characteristics of the epoxy film with rigid phenyl-flexible etherified methylene chains

引用

Journal of Materials Science & technology 2024年第16期183卷 12-22页

作者： Zhengdong Wang Mengli Li Botao Liu Ganqiu Yang Meng Luo Tong Zhang Ling Li Yonghong Cheng Zirui Jia Guanglei Wu School of Mechanical and Electrical Engineering Xi’an University of Architecture and TechnologyXi’an 710055China State Key Laboratory of Electrical Insulation and Power Equipment Xi’an Jiaotong UniversityXi’an 710049China Institute of Materials for Energy and Environment State Key Laboratory of Bio-Fibers and Eco-TextilesCollege of Materials Science and EngineeringQingdao UniversityQingdao 266071China

The introduction of highly polarized flexible segments into polymer molecular chains is an effective means to improve the dielectric constant and mechanical flexibility of polymers,which is important for improving the energy storage characteristics and applicability for the roll-to-roll process of metallic film ***,the introduction of flexible segments may adversely affect the heat resistance of polymer materials,which limits their application at high working *** this work,we have prepared a novel epoxy film with excellent comprehensive properties by introducing rigid phenyl and flexible etherified methylene side *** instance,the optimal epoxy film showed an energy storage density of 7.06 J cm^(-3)and 85%charge-discharge efficiency at room temperature and 420 kV mm^(-1).At 200 kV mm^(-1)and 110°C,a working condition for the application of the electric vehicle,the prepared film still showed an energy storage density of 1.5 J cm^(-3)and charge-discharge efficiency of 86%,which is 3 times that of BOPP *** work provides an idea for material designs of high-performance polymer film capacitors.

关键词： Epoxy film Amine hardeners Flexible side chain Thermodynamic properties Dielectric properties Energy storage performance

来源：评论

学校读者我要写书评

暂无评论

A tree-growing graphic model for asymmetrical phantom networks in polymeric gels undergoing dynamic mechanochemical coupling

引用

Science China(Technological Sciences) 2024年第2期67卷 558-567页

作者： SHI WeiLin ZHOU Jian LU HaiBao ELMARAKBI Ahmed FU Yong-Qing National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of TechnologyHarbin 150080China College of Mechanical and Vehicle Engineering Hunan UniversityChangsha 410082China Faculty of Engineering and Environment University of NorthumbriaNewcastle upon Tyne NEI 8STUK

Network structures of various polymers have significant effects on their mechanical properties;therefore,numerous studies have investigated the constitutive relationship between symmetrical network structures and their rubber elasticity in ***,few studies have focused on asymmetrical network structures in polymers that undergo bond exchange reactions,selfassembly,or mechanochemical coupling—all of which are induced by transition probabilities of chemical bonding *** this study,an extended constraint junction and phantom network model is formulated using the tree-growing theory to establish a constitutive relationship between asymmetrical network structures and their rubber elasticity in polymers.A free-energy equation is further developed to explore working principles of configurational transitions on the dynamic rubber elasticity of symmetrical and asymmetrical network *** constitutive relationship between dynamic rubber elasticity and symmetrical and asymmetrical network structures has also been proposed for the gels undergoing mechanochemical and hydromechanical ***,the effectiveness of this newly proposed tree-growing model has been verified by comparing with the classical affine network model,finite element analysis,and the experimental results of gels reported in literature.

关键词： gel polymer network rubber elasticity asymmetric

来源：评论

学校读者我要写书评

暂无评论

Experimental and modeling investigations on the unexpected hydrogen sulfide rebound in a sewer receiving nitrate addition: Mechanism and solution

引用

Journal of environmental Sciences 2023年第3期125卷 630-640页

作者： Zhensheng Liang Dongping Wu Guibiao Li Jianliang Sun Feng Jiang Yu Li School of Environment Guangdong Provincial Key Laboratory of Chemical Pollution and Environmental Safety&MOE Key Laboratory of Theoretical Chemistry of EnvironmentSouth China Normal UniversityGuangzhou 510006China Guangdong Provincial Key Lab of Environmental Pollution Control and Redemidation Technology School of Environmental Science&EngineeringSun Yat-sen UniversityGuangzhou 510275China

Biogenic hydrogen sulfide is an odorous, toxic and corrosive gas released from sewage in sewers. To control sulfide generation and emission, nitrate is extensively applied in sewer systems for decades. However, the unexpected sulfide rebound after nitrate addition is being questioned in recent studies. Possible reasons for the sulfide rebounds have been studied,but the mechanism is still unclear, so the countermeasure is not yet proposed. In this study, a lab-scale sewer system was developed for investigating the unexpected sulfide rebounds via the traditional strategy of nitrate addition during 195-days of operation. It was observed that the sulfide pollution was even severe in a sewer receiving nitrate addition. The mechanism for the sulfide rebound can be differentiated into short-term and long-term effects based on the dominant contribution. The accumulation of intermediate elemental sulfur in biofilm resulted in a rapid sulfide rebound via the high-rate sulfur reduction after the depletion of nitrate in a short period. The presence of nitrate in sewer promoted the microorganism proliferation in biofilm, increased the biofilm thickness, re-shaped the microbial community and enhanced biological denitrification and sulfur production, which further weakened the effect of nitrate on sulfide control during the long-term operation. An optimized biofilminitiated sewer process model demonstrated that neither the intermittent nitrate addition nor the continuous nitrate addition was a sustainable strategy for the sulfide control. To minimize the negative impact from sulfide rebounds, a(bi)monthly routine maintenance(e.g., hydraulic flushing with nitrate spike) to remove the proliferative microorganism in biofilm is necessary.

关键词： Hydrogen sulfide control Nitrate addition Sewer modelling Sewer management

来源：评论

学校读者我要写书评

暂无评论

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

请选择保存的检索档案：

请选择收藏分类：

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

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

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：