检索结果-南通市图书馆

Microstructure and properties of LZQT600-3 HCCDIBs for plunger pump cylinder

在线全文

学校读者我要写书评

暂无评论

China Foundry 2024年第2期21卷 197-204页

作者： Chun-jie Xu Yuan-ying Jin Dong Ma Zhen Zhao Jia-wei Qi shang sui Xiang-quan Wu Can Guo Zhong-ming Zhang Yong-hui Liu Dan Shechtman School of Materials Science and Engineering Xi'an University of TechnologyXi'an 710048China Xi'an Shechtman Nobel Prize New Materials Institute Xi'an 710048China Tongchuan Huazhu Precision Technology Co. Ltd.Tongchuan 727100ShaanxiChina Faculty of Materials Science and Engineering Technion-Israel Insititue of TechnologyHaifa 3200003Israel

It is important to improve the comprehensive performance of the ductile iron bars(DIBs)for the cylinder block of the extra high pressure hydraulic plunger pump and accelerate the industrial *** this work,the LZQT600-3 DIBs with the diameter of 145 mm were prepared by the horizontal continuous casting(HCC)process,that is,LZQT600-3 *** microstructure and room temperature tensile properties of different sections[left-edge(surface layer),left-1/2R(left half of the radius),and the center of the HCCDIBs]were *** results show that the spheroidization of LZQT600-3 HCCDIBs matrix from the left-edge,left-1/2R to the center is at nodulizing grade II and *** the cooling rate gradually decreases from surface to the center of the HCCIBs,the number of spheroidized graphite is gradually reduced,the size is gradually increased,the shape factor is decreased,and the pearlite content and lamellate spacing are *** the horizontal direction of the section,the hardness of the material is distributed symmetrically around the center of the *** the vertical direction,the hardness distribution in the center of the HCCDIBs is asymmetrical due to the gravity during the solidification ***,the microstructure in the lower part of the section solidifies relatively *** left-edge has the best tensile mechanical properties,and the ultimate tensile strength,yield tensile strength and elongation are 597.3 MPa,418.5 MPa and 9.6%,*** tensile fracture belongs to the ductile-brittle hybrid *** comprehensive performances of LZQT600-3 HCCDIBs meet the actual application requirements of ultra-high pressure hydraulic plunger pump cylinder.

关键词： horizontal continuous casting(HCC) nodular cast iron ductile iron bars microstructure mechanical properties

Useful way to compensate for intrinsic birefringence caused by calcium fluoride in optical lithography systems

在线全文

学校读者我要写书评

暂无评论

Chinese Optics Letters 2018年第3期16卷 71-75页

作者： Zelong Zhou Hongbo shang Yongxin sui Huaijiang Yang Engineering Researcher Center of Extreme Precision Optics Changchun Institute of OpticsFine Mechanics and PhysicsChinese Academy of SciencesChangchun 130033China University of Chinese Academy of Sciences Beijing 100049China

Calcium fluoride is widely used in optical lithography lenses and causes retardation that cannot be ***,few studies have been conducted to compensate for the retardation caused by calcium fluoride in optical lithography *** this Letter,a new index based on orientation Zernike polynomials is established to describe the value of ***,a method of retardation compensation is *** method is implemented by clocking calcium fluoride lens elements,and the optimal rotation angles are calculated using a population-based stochastic optimization ***,an example is provided to validate the method.

关键词： Deep ultraviolet Fluoride Optical elements Optical lithography Phase shift Zernike polynomials

Statistical study of magnetotail flux ropes near the lunar orbit

在线全文

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2016年第10期59卷 1591-1596页

作者： ZHAO Si Qi TIAN An Min SHI Quan Qi XIAO Chi Jie FU sui Yan ZONG Qiu Gang WANG Hui Zi ZHANG Shuai ZHAO Shao Jie PAN Dong Xiao TENG shang Chun LIU Yi Xing TAN Kun Shandong Provincial Key Laboratory of Optical Astronomy and Solar-Terrestrial Environment School of Space Science and PhysicsShandong University School of Physics Peking University School of Earth and Space Science Peking University

Flux-rope/TCR events near the magnetotail lunar orbit （-67RE 〈 GSM X＊〈 -39RE） were studied using magnetic-field and plasma data measured by THEMIS B and C between January 2011 and March 2012. The aberrant coordinate GSM＊, where the X＊ axis is rotated 4° relative to GSM-X, was used to count the occurrence rate. The number ratio of earthward to tailward events was about 3：5. Moreover, the event occurrence rate distribution showed a clear dawn-dusk asymmetry distribution, with dusk-side events accounting for 57.98%. A superposed epoch analysis of the flux-rope events showed that earthward events had a shorter duration in the leading than in the trailing part. Earthward events also displayed a lower temperature and a lower flow speed than tailward events. We studied the relationship between the event occurrence rate and geomagnetic activity level even further. The occurrence rate of tailward flux-rope/TCR events increases with increasing AE-index, whereas earthward events occur mainly in the relatively quiet period of geomagnetic activity （AE - 100-300 nT）. Flux-rope/TCR events identi- fied within a 10 mm time frame were treated as belonging to a single reconnection event. By comparing the occurrence rates of earthward and tailward events along X＊, we estimated the most likely location of the near-Earth reconnection site as X＊ = -36RE.

关键词： magnetotail flux rope TCR dawn-dusk asymmetry reconnection site

Self-exothermic reaction driven large-scale synthesis ofphosphorescent carbon nanodots

在线全文

学校读者我要写书评

暂无评论

Nano Research 2021年第7期14卷 2231-2240页

作者： Shi-Yu Song Lai-Zhi sui Kai-Kai Liu Qing Cao Wen-Bo Zhao Ya-Chuan Liang Chao-Fan Lv Jin-Hao Zang Yuan shang Qing Lou Xi-Gui Yang Lin Dong Kai-Jun Yuan Chong-Xin Shan Henan Key Laboratory of Diamond Optoelectronic Materials and Devices School of Physics and MicroelectronicsZhengzhou UniversityZhengzhou 450052China State Key Laboratory of Molecular Reaction Dynamics Dalian Institute of Chemical PhysicsChinese Academy of Sciences457 Zhongshan RoadDalian 116023China Super Computer Center Smart City InstituteZhengzhou UniversityZhengzhou 450001China

Phosphorescent carbon nanodots(CNDs)have various attractive properties and potential applications,but it remains a formidable challenge to achieve large-scale phosphorescent CNDs limited by current ***,a large-scale synthesis method for phosphorescent CNDs has been demonstrated via precursors’self-exothermic reaction at room *** as-prepared CNDs show fluorescence and phosphorescence property,which are comparable with that synthesized by solvothermal and microwave *** and computational studies indicate that exotic atom doped sp^(2) hybridized carbon core works as an emissive center,which facilities the intersystem crossing from singlet state to triplet *** CNDs show phosphorescence with tunable lifetimes from 193 ms to 1.13 s at different *** demonstration of large-scale synthesis of phosphorescent CNDs at room temperature opens up a new window for room temperature fabrication phosphorescent CNDs.

关键词： carbon nanodots phosphorescence large scale self-exothermic reaction

Customized heat treatment process enabled excellent mechanical properties in wire arc additively manufactured Mg-RE-Zn-Zr alloys

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

International Journal of Extreme Manufacturing 2024年第4期6卷 276-289页

作者： Dong Ma Chunjie Xu shang sui Yuanshen Qi Can Guo Zhongming Zhang Jun Tian Fanhong Zeng Sergei Remennik Dan Shechtman School of Materials Science and Engineering Xi'an University of TechnologyXi'anShaanxi 710048People's Republic of China Xi'an Shechtman Nobel Prize New Materials Institute Xi'an 710048People's Republic of China Xi'an Key Laboratory of Advanced Magnesium Alloy Additive Manufacturing and Precision Forming Xi'anShaanxi 710048People's Republic of China Department of Materials Science and Engineering and Guangdong Provincial Key Laboratory of Materials and Technologies for Energy Conversion Guangdong Technion—Israel Institute of TechnologyShantou 515063People's Republic of China MGM Nobel Prize New Materials Co. LtdTongchuan 727100People's Republic of China Department of Materials Science and Engineering Technion-Israel Institute of TechnologyHaifa 32000Israel Center for Nanoscience&Nanotechnology Hebrew University of JerusalemEdmond J.Safra CampusJerusalem 91904Israel

Customized heat treatment is essential for enhancing the mechanical properties of additively manufactured metallic materials,especially for alloys with complex phase constituents and heterogenous ***,the interrelated evolutions of different microstructure features make it difficult to establish optimal heat treatment ***,we proposed a method for customized heat treatment process exploration and establishment to overcome this challenge for such kind of alloys,and a wire arc additively manufactured(WAAM)Mg-Gd-Y-Zn-Zr alloy with layered heterostructure was used for feasibility *** this method,the optimal microstructures(fine grain,controllable amount of long period stacking ordered(LPSO)structure and nano-scaleβ'precipitates)and the corresponding customized heat treatment processes(520°C/30 min+200°C/48 h)were obtained to achieve a good combination of a high strength of 364 MPa and a considerable elongation of 6.2%,which surpassed those of other state-of-the-art WAAM-processed Mg ***,we evidenced that the favorable effect of the undeformed LPSO structures on the mechanical properties was emphasized only when the nano-scaleβ'precipitates were *** is believed that the findings promote the application of magnesium alloy workpieces and help to establish customized heat treatment processes for additively manufactured materials.

关键词： wire arc additive manufacturing heat treatment Mg-RE-Zn-Zr alloys LPSO structure mechanical properties

Additive manufacturing of magnesium and its alloys: process-formabilitymicrostructure-performance relationship and underlying mechanism

在线全文

学校读者我要写书评

暂无评论

International Journal of Extreme Manufacturing 2023年第4期5卷 247-290页

作者： shang sui Shuai Guo Dong Ma Can Guo Xiangquan Wu Zhongming Zhang Chunjie Xu Dan Shechtman Sergei Remennik Daniel Safranchik Rimma Lapovok School of Materials Science and Engineering Xi’an University of TechnologyXi’anShaanxi 710048People’s Republic of China Xi’an Shechtman Nobel Prize New Materials Institute Xi’an 710048People’s Republic of China Xi’an Key Laboratory of Advanced Magnesium Alloy Additive Manufacturing and Precision Forming Xi’anShaanxi 710048People’s Republic of China School of Materials Science and Engineering Liaocheng UniversityLiaochengShandong 252059People’s Republic of China Department of Materials Science and Engineering Technion-Israel Institute of TechnologyHaifa 32000Israel Center for Nanoscience&Nanotechnology Hebrew University of JerusalemEdmond J.Safra CampusJerusalem 91904Israel Israel Institute of Metals Technion CityHaifa 3200003Israel Institute for Machine Elements Engineering Design and ManufacturingFreiberg 09599Germany Geelong Waurn Ponds Campus Deakin UniversityPigdons RoadGeelongVic 3216Australia

Magnesium and its alloys,as a promising class of materials,is popular in lightweight application and biomedical implants due to their low density and good *** manufacturing(AM)of Mg and its alloys is of growing interest in academia and *** domain-by-domain localized forming characteristics of AM leads to unique microstructures and performances of AM-process Mg and its alloys,which are different from those of traditionally manufactured ***,the intrinsic mechanisms still remain unclear and need to be in-depth ***,this work aims to discuss and analyze the possible underlying mechanisms regarding defect appearance and elimination,microstructure formation and evolution,and performance improvement,based on presenting a comprehensive and systematic review on the relationship between process parameters,forming quality,microstructure characteristics and resultant ***,some key perspectives requiring focus for further progression are highlighted to promote development of AM-processed Mg and its alloys and accelerate their industrialization.

关键词： additive manufacturing magnesium alloys underlying mechanisms forming quality microstructure characteristics and properties

Optimization based on sensitivity for material birefringence in projection lens

在线全文

学校读者我要写书评

暂无评论

Chinese Optics Letters 2020年第6期18卷 55-59页

作者： Hongbo shang Luwei Zhang Chunlai Liu Ping Wang Yongxin sui Huaijiang Yang Changchun Institute of Optics Fine Mechanics and PhysicsChinese Academy of SciencesChangchun 130033China University of Chinese Academy of Sciences Beijing 100049China State Key Laboratory of Laser Interaction with Matter Changchun Institute of OpticsFine Mechanics and PhysicsChinese Academy of SciencesChangchun 130033China

Polarization aberration caused by material birefringence can be partially compensated by lens *** this Letter,we propose a fast and efficient clocking optimization ***,the material birefringence distribution is fitted by the orientation Zernike *** this basis,the birefringence sensitivity matrix of each lens element can be *** we derive the rotation matrix of the orientation Zernike polynomials and establish a mathematical model for clocking ***,an optimization example is given to illustrate the efficiency of the new *** result shows that the maximum RMS of retardation is reduced by 64%using only 48.99 s.

关键词： birefringence polarization aberration projection lens.

在线全文

学校读者我要写书评

暂无评论

共晶SnBi/Cu焊点界面处Bi的偏析

金属学报 2005年第8期41卷 847-852页

作者：刘春忠张伟隋曼龄尚建库中国科学院金属研究所沈阳材料科学国家(联合)实验室

利用SEM,TEM,XRD分析了共晶SnBi/Cu焊点经120℃时效7 d后界面组织结构的变化.焊点界面处金属间化合物厚度由原来初始态的约2 μm增至时效态的10 μm,并且化合物也由原来单一的Cu6Sn5转变为Cu6Sn5和Cu3Sn 相.进一步研究表明,在Cu3Sn与Cu... 详细信息

利用SEM,TEM,XRD分析了共晶SnBi/Cu焊点经120℃时效7 d后界面组织结构的变化.焊点界面处金属间化合物厚度由原来初始态的约2 μm增至时效态的10 μm,并且化合物也由原来单一的Cu6Sn5转变为Cu6Sn5和Cu3Sn 相.进一步研究表明,在Cu3Sn与Cu之间界面处偏析了大量尺寸约100 nm的Bi颗粒.双缺口试样的断裂韧性实验表明, 热时效促使焊点断裂韧性快速下降,同时该焊点的断口也由原来初始态的韧性断裂转变为时效后Cu3Sn与Cu界面处的脆性断裂,脆性断裂后一侧断口为鲜亮的Cu表面.在TEM下,通过与220℃/5 d时效态纯Sn/Cu焊点相同界面的比较,可以断定引起该焊点失效的原因是Bi颗粒在此界面处的偏析.含Bi无Pb焊料由于Bi在界面析出而引发的脆断将会是微电子器件长期使用中的一个潜在危害.

关键词：共晶SnBi/Cu焊点偏析界面反应无铅焊料

在线全文

学校读者我要写书评

暂无评论

面向复杂构型飞机的非定常气动力建模与辨识

航空学报 2016年第8期37卷 2464-2471页

作者：杨文卜忱眭建军尚祖铭中航工业空气动力研究院气动发展部哈尔滨150001

不论是现代高机动隐身战斗机的设计需求还是常规布局飞机的飞行动力学分析,深入研究大迎角飞行时的非线性非定常气动力模型都极其重要。基于纵向运动小振幅及大振幅强迫振荡试验数据,分析了常规稳定导数模型的准确性,并从导数模型出发... 详细信息

不论是现代高机动隐身战斗机的设计需求还是常规布局飞机的飞行动力学分析,深入研究大迎角飞行时的非线性非定常气动力模型都极其重要。基于纵向运动小振幅及大振幅强迫振荡试验数据,分析了常规稳定导数模型的准确性,并从导数模型出发发展了简化涡流和分离流时间迟滞效应的非定常气动力线性模型和非线性模型,最后应用风洞典型机动历程模拟试验验证了模型的有效性。结果表明:对于复杂构型高机动飞机模型,发展并改进的非线性微分方程模型可以准确预测飞机不同机动下的非定常气动力特性,具有较强的工程可行性。

关键词：大迎角非定常气动力时间迟滞微分方程典型机动