检索结果-南通市图书馆

Microstructure Evolution and Nanomechani.al Behavior of Micro-Area in Molten Pool of Selective Laser Melting(CoCrni._(82)Al_(9)Ti_(9)High-Entropy Alloy

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sini.a(English Letters) 2024年第6期37卷 1019-1033页

作者： hong-Wei Zhang Li-Wei Lan Zhe-Yu Yang Chang-Chun Li Wen-Xian Wang College of Materials Science and Engineering Taiyuan University of TechnologyTaiyuan030024China Mini.try of Education Key Laboratory of Interface Science and Engineering in Advanced MaterialsTaiyuan University of TechnologyTaiyuan030024China Shanxi-Zhejiang Uni.ersity New Materials and Chemical Research Institute Taiyuan030032China

In this work,the phase evolution mechani.m and nanomechani.al properties of(CoCrni.)(82)Al_(9)Ti_(9)high-entropy alloy(HEA)prepared by selective laser melting(SLM)in the molten pool were *** HEA contains multiple primary elements and undergoes high-temperature gradient and rapid cooling during *** leads to signi.icant inhomogeneity of nano-scale microstructure characteristics and instability of *** optimizing process parameters,the microstructure evolution at the optimal parameter volume energy density of 440 J/mm^(3)was studied.A phase transition from BCC to FCC occurred in the melt *** the micro-area of the melt pool results in a temperature rise and the combustion-induced loss of Al ***,the ni.element content increases signi.icantly outside the melt *** process enhances the phase stability of FCC and facilitates phase ***,rapid cooling leads to the formation of distinctive ultrafine equiaxial crystals inside the melt pool,accompani.d by the generation of intracrystalline needle-like nano-scale *** the melt pool,the accumulation of energy results in the formation of coarse ***,the nano-hardness inside the molten pool is remarkably high at 11.79 GPa,while the outside the molten pool is reduced to 9.58 *** the fracture toughness outside the melt pool also *** with inside the melt pool,the residual stress outside the melt pool changed from compressive to tensile stress and decreased from 603.28 to 322.84 MPa.

关键词： High-entropy alloys Selective laser melting Microstructure evolution Nanoindentation

基于改进CenterNet的红外小目标检测研究

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

激光与红外 2024年第9期54卷 1469-1476页

作者：倪安庆李军王耀弘重庆交通大学机电与车辆工程学院重庆400074 重庆市计量质量检测研究院重庆401121

随着机器学习技术的不断发展,对目标检测技术的研究也越来越火热。针对目标检测中精度低、实时性差的问题。本文采用了一种单阶段的目标检测算法CenterNet完成对目标的快速识别,在算法的主干网络ResNet50增加CBAM注意力机制,提升了网络... 详细信息

随着机器学习技术的不断发展,对目标检测技术的研究也越来越火热。针对目标检测中精度低、实时性差的问题。本文采用了一种单阶段的目标检测算法CenterNet完成对目标的快速识别,在算法的主干网络ResNet50增加CBAM注意力机制,提升了网络对目标的识别精度;在网络的输出模块,采用一种新的GSConv卷积模块,在不损失精度的情况下提高了检测速度。改进后的算法在红外数据集上验证其检测的准确性,其检测准确率达到82.91%。研究结果表明:改进的CenterNet算法,可准确高效的完成对红外小目标的识别。

关键词：红外目标检测 CenterNet 注意力机制 GSConv

Integration of metal-organi. layers with quantum dots for artificial photosynthesis

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2024年第11期67卷 3712-3718页

作者： hong Yuan Min Zhang Ji-Hua Deng Tong-Bu Lu Di-Chang Zhong Institute for New Energy Materials and Low Carbon Technologies School of Materials Science and Engineering School of Chemistry and Chemical Engineering Tianjin University of Technology

Metal-organi. layers（MOLs）, a type of new-emerging two-dimensional ultrathin metal-organi. framework materials with large surface areas and highly exposed active sites, have shown promising applications in photocatalytic CO2reduction. However, due to a lack of photosensitivity and photooxidation capability, photosensitizers and sacrificial reductants are usually necessary for MOLs-based photocatalytic CO2reduction systems. In this article, by integration of MOLs and quantum dots（QDs）, we constructed MOLs-based catalysts with multi-functions of photosensitivity, photoreduction and photooxidation, which thus can serve as photocatalysts for CO2reduction with H2O as an electron donor. Specifically, by an electrostatic self-assembly approach,ni.kel（Ⅱ）-based MOLs（ni.MOLs） and CsPbBr3QDs have been assembled, constructing valid Ⅱ-Scheme ni.MOLs/CsPbBr3heterojunctions with close ni.MOLs/CsPbBr3heterointerface. Such a close heterointerface shortens the charge transfer distance,thus effectively boosting the charge separation and transfer. As a result, upon illumination by visible light(λ ≥ 400 nm,100 m W cm-2), the optimized photocatalyst shows high efficiency and stability in photochemical CO2reduction in the absence of any photosensitizers and sacrificial reductants. The CO yield reaches as high as 124 μmol g-1in 4 h, over 6 times higher than that achieved by CsPbBr3. Additionally, the selectivity reaches 100%. This work provides a new way to construct MOL-based catalysts for artificial photosynthesis.

关键词： metal-organi. layers artificial photosynthesis CO2 reduction H2O oxidation

In-situ coating and surface partial protonation co-promoting performance of single-crystal ni.kel-rich cathode in all-solid-state batteries

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2024年第2期89卷 137-143,I0005页

作者： Maoyi Yi Jie Li Mengran Wang Xinming Fan Bo hong Zhian Zhang Aonan Wang Yanqing Lai School of Metallurgy and Environment Central South UniversityChangsha 410083HunanChina Engineering Research Centre of Advanced Battery Materials The Ministry of EducationChangsha 410083HunanChina Hunan Province Key Laboratory of Nonferrous Value-Added Metallurgy Central South UniversityChangsha 410083HunanChina

The poor electrochemical performance of all-solid-state batteries(ASSBs),which is assemblied by ni.rich cathode and poly(ethylene oxide)(PEO)-based electrolytes,can be attributed to unstable cathodic interface and poor crystal structure stability of ni.rich *** coating strategies are previously employed to enhance the stability of the cathodic interface and crystal structure for ni.rich ***,these methods can hardly achieve simplicity and high efficiency *** this work,polyacrylic acid(PAA)replaced traditional PVDF as a binder for cathode,which can achieve a uni.orm PAA-Li(LixPAA(0ni.(0.83)Co_(0.12)Mn_(0.05)O_(2)(SC-NCM83)due to H^(+)/Li^(+)exchange reaction during the ini.ial charging-discharging *** formation of PAA-Li coating layer on cathode can promote interfacial Li^(+)transport and enhance the stability of the cathodic ***,the partially-protonated surface of SC-NCM83 casued by H^(+)/Li^(+)exchange reaction can restrict ni.ions transport to enhance the crystal structure *** proposed SC-NCM83-PAA exhibits superior cycling performance with a retention of 92%compared with that(57.3%)of SC-NCM83-polyvinylidene difluoride(PVDF)after 200 *** work provides a practical strategy to construct high-performance cathodes for ASSBs.

关键词： Single-crystal Lini.(0.83)Co_(0.12)Mn_(0.05)O_(2) In-situ coating PAA-Li Partial protonation

Corrosion behavior of pure metals(ni.and Ti)and alloys(316H SS and GH3535)in liquid GaInSn

在线全文

学校读者我要写书评

暂无评论

Nuclear Science and Techni.ues 2024年第3期35卷 70-83页

作者： Jian-Hui Yu hong-Xia Xu Xiang-Xi Ye Bin Leng Han-Xun Qiu Xing-Tai Zhou School of Materials and Chemistry University of Shanghai for Science and TechnologyShanghai 200093China Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China

In this study,the interactions between a Ga-based liquid metal,GaInSn,and several metal materials,including pure metals(ni.and Ti)and alloys(316H stainless steel(SS)and GH3535),at 650℃were *** aim was to evaluate the corrosion performance and select a suitable candidate material for use as a molten salt manometer diaphragm in thermal energy storage *** results indicated that the alloys(316H SS and GH3535)exhibited less corrosion than pure metals(ni.and Ti)in liquid ***-rich binary intermetallic compounds were found to form on the surfaces of all the tested metal materials exposed to liquid GaInSn,as a result of the decomposition of liquid GaInSn and its reaction with the constituent elements of the metal *** corrosion mechani.m for all the tested materials exposed to liquid GaInSn was also investigated and proposed,which may aid in selecting the optimal candidate material when liquid GaInSn is used as the pressure-sensing medium.

关键词： Metal materials Liquid GaInSn Corrosion Intermetallic compounds Thermal energy storage systems

Characterization and degradation of β-Sn particles in thermal aged Pb-rich solder joint for low-temperature co-fired ceramic(LTCC) applications

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2024年第10期43卷 5346-5361页

作者： Jin-hong Liu Zhe Zhu Qiang-Qiang ni. Jun-Fu Liu Peng He Shu-Ye Zhang State Key Laboratory of Advanced Welding and Joini.g Harbin Institute of Technology Anhui Key Laboratory of Microsystem East China Research Institute of Microelectronics School of Materials Science and Engineering Hefei University of Technology

High-lead solder joints are still playing an indispensable role in military and space ***, in-depth characterization of high-lead solder joints and the underlying degradation mechani.ms remain unexplored. This research first performed aging tests on Sn10Pb90 solder joints, the shear strength at room and elevated temperatures gradually reduced, and the resistance increased. Here, a two-layered ni.Sn intermetallic compound(IMC) structure was identified using transmission electron microscopy(TEM), which could be attributed to the change of Sn content in the solder. Moreover, the internal annealing twin of a Sn particle was discovered,which could be attributed to creeping induced by thermal expansion coefficient(CTE) difference between Sn and *** analysis of partial and whole annealing twins was conducted through high-resolution TEM(HRTEM).Finally, four degradation mechani.ms were *** of the IMC layer would result in increased brittleness and resistivity. For particle coarseni.g, apart from dimini.hing the ductility and toughness of the solder joint, it would also accelerate the creeping rate by weakeni.g the phase boundary strength. Regarding voids and cracks induced by phase boundary sliding, wedgeshaped cracking and pore-shaped cracking were discovered and their formation was analyzed. Most importantly, the consumption of Sn resulted in a depletion of wettable layer,leading to the formation of Pb streams and isolated IMC islands, also known as the spalling and delamination of IMCs. Pb diffusion followed a spiral path, which was mutually influenced by orientation misfit and concentration gradient. A techni.ue to prevent cracking was *** research is expected to provide signi.icant techni.al references for high-lead solder joints.

关键词： Aging Degradation mechani.ms High-lead solder joints Properties TEM characterization

Systematic and long-term techni.al validity of toxicity determination and early warni.g of heavy metal pollution based on an automatic water-toxicity-determination-system

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Environmental Science & Engineering 2024年第8期18卷 59-71页

作者： Yue Yi Baoguo Wang Xuemei Yi Fan Zha Haisen Lin Zhijun Zhou Yanhong Ge hong Liu School of Life Science Beijing Institute of TechnologyBeijing 100081China Institute of Environmental Biology and Life Support Technology School of Biological Science and Medical EngineeringBeihang UniversityBeijing 100191China Infore Environment Technology Group Foshan 528000China Jiangmen Ecological Environment Moni.oring Station Jiangmen 529000China Guangzhou Sub-branch of Guangdong Ecological and Environmental Moni.oring Center Guangzhou 510000China

Water toxicity determination with electrochemically active bacteria(EAB)shows promise for providing early warni.gs for heavy metal pollution in ***,thus far,only idealized tests with a few types of heavy metals have been *** this study,an automatic water-toxicitydetermination system with high techni.al maturity was established,and the toxicological properties of common heavy metals were systematically *** results demonstrated that the common heavy metals linearly inhibited EAB currents in the range of 0.1 mg/L to 0.5 mg/*** toxicity ranking of the tested heavy metals was Pb^(2+)>Tl^(3+)>Cu^(2+)>Cd^(2+)>Zn^(2+)>ni.(2+)>Hg^(2+)>As^(3+).The toxicity interaction mainly exhibited an antagoni.tic effect in binary heavy metal *** system can accurately determine surface water toxicity and rapidly moni.or heavy metal pollution,with good repeatability and a long ***,this study demonstrates that EAB are capable of long-term(>60 d)surface water quality moni.oring and on-site early warni.g of heavy metal pollution.

关键词： Biological early warni.g system Electrochemically active bacteria Water toxicity determination Biosensor Heavy metal pollution Early warni.g

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

大学英语课程思政建设路径探索

蚌埠学院学报 2024年第4期13卷 102-106页

作者：倪红素安徽文达信息工程学院大学外语教学部安徽合肥231201

课程思政作为新时期深化高校教育改革的一种新的教育理念和课程观,以国务院、教育部所颁发的有关课程思政建设文件为指导,以两个《指南》为依据,在大学英语课程思政建设方面进行了有益的探索。研究证明,在大学英语课程教学目标制定中突... 详细信息

课程思政作为新时期深化高校教育改革的一种新的教育理念和课程观,以国务院、教育部所颁发的有关课程思政建设文件为指导,以两个《指南》为依据,在大学英语课程思政建设方面进行了有益的探索。研究证明,在大学英语课程教学目标制定中突出社会主义核心价值观,提高教师的立德树人意识,深入发掘教材中的思政资源,创新教学方法,建立科学、合理的课程评价机制等是大学英语课程思政建设的有效路径。

关键词：大学英语课程思政思政教育教学目标

左氧氟沙星滴眼液对睑板腺功能障碍合并白内障手术患者眼表菌群组成的影响

在线全文

学校读者我要写书评

暂无评论

中华医院感染学杂志 2024年第6期34卷 877-881页

作者：刘娴曾明范张妮红南阳医学高等专科学校第一附属医院眼科二病区河南南阳473058

目的评估使用5%左氧氟沙星滴眼液对睑板腺功能障碍合并白内障手术患者眼表细菌群落组成及多样性的影响。方法选择2021年4月—2022年10月在南阳医学高等专科学校第一附属医院眼科接受睑板腺功能障碍合并白内障手术的180例患者为研究对... 详细信息

目的评估使用5%左氧氟沙星滴眼液对睑板腺功能障碍合并白内障手术患者眼表细菌群落组成及多样性的影响。方法选择2021年4月—2022年10月在南阳医学高等专科学校第一附属医院眼科接受睑板腺功能障碍合并白内障手术的180例患者为研究对象,从手术前3 d开始,每天向待手术眼滴注4次5%左氧氟沙星滴眼液,用药前和用药后,双眼结膜拭子采样,通过16S rRNA基因测序,比较用药前后眼表细菌群落多样性和分类学差异。结果本研究最终纳入63例(100眼)患者,共获得94份样本,534 664条有效序列及941个OTUs,使用5%左氧氟沙星滴眼液后,眼表微生物OTUs数量较用药前减少;Alpha和Beta多样性分析结果显示,用药后与用药前微生物群落无统计学差异;物种分类组成分析显示,用药前与用药后核心关键微生物具有统计学差异(P<0.05)。结论睑板腺功能障碍合并白内障手术患者眼表细菌菌群多样性丰富,5%左氧氟沙星滴眼液可改变眼表细菌群落,而不改变眼内的生理微生物组成。白内障手术前使用5%左氧氟沙星滴眼液作为安全和选择性的治疗,可能有利于改善眼表生理防御和控制细菌性眼表污染。

关键词：眼表微生物群睑板腺功能障碍白内障手术 16S rRNA基因扩增子测序左氧氟沙星滴眼液