检索结果-南通市图书馆

Microstructural evolution of a superaustenitic stainless steel during a two-step deformation process

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 Minerals,Metallurgy and Materials 2018年第2期25卷 181-189页

作者： N.Bayat G.R.Ebrahimi A.Momeni h.R.Ezatpour Department of Materials and Polymer Engineering Hakim Sabzevari University Department of Materials Science and Engineering Hamedan University of Technology Faculty of Engineering Sabzevar University of New Technology

Single-and two-step hot compression experiments were carried out on 16cr25Ni6Mo superaustenitic stainless steel in the temperature range from 950 to 1150°c and at a strain rate of 0.1 s^（-1）. In the two-step tests, the first pass was interrupted at a strain of 0.2; after an interpass time of 5, 20, 40, 60, or 80 s, the test was resumed. The progress of dynamic recrystallization at the interruption strain was less than 10%. The static softening in the interpass period increased with increasing deformation temperature and increasing interpass time. The static recrystallization was found to be responsible for fast static softening in the temperature range from 950 to 1050°c. however, the gentle static softening at 1100 and 1150°c was attributed to the combination of static and metadynamic recrystallizations. The correlation between calculated fractional softening and microstructural observations showed that approximately 30% of interpass softening could be attributed to the static recovery. The microstructural observations illustrated the formation of fine recrystallized grains at the grain boundaries at longer interpass time. The Avrami kinetics equation was used to establish a relationship between the fractional softening and the interpass period. The activation energy for static softening was determined as 276 kJ/mol.

关键词： superaustenitic stainless steel dynamic recrystallization static softening metadynamic recrystallization microstructural evolution Avrami kinetics equation

维普期刊数据库

ThREE NEW SPEcIES OF GENONEOPSYLLA WU, WU & LIU, 1966 WITh A DIScUSSION ON ThE chARAcTERS OF ThE GENUS

在线全文

学校读者我要写书评

暂无评论

昆虫学报 1980年第3期 328-330页

作者： WU h.Y. hSIEh P.c. LIU L.c. TSAI L.Y. Wu W.c. LIU c. chANG W.F.

So far, only three species of Genoneopsylla were known from china andNepal. In the present paper three new species and one new record of the genus areherewith deseribed from western china. For comparison of the salient characters of the five species of the genus in chinaa table is appended at the end of the paper. Since the rapid in crease of the species of Ge-

关键词： WITh A DIScUSSION ON ThE chARAcTERS OF ThE GENUS WU LIU ThREE NEW SPEcIES OF GENONEOPSYLLA WU

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

建筑绘图技巧与实例 1

Petrogenesis of the ükapili Granitoid and its Mafic Enclaves in Elmal Area (Nigde, central Anatolia, Turkey)

丛书名：美国建筑师入门教材

1998年

作者：（美）h.c.布朗宁樊瑜瑾徐人平译

《美国建筑师入门教材：建筑绘图技巧与实例》经过精心安排，重点突出了建筑制图的基本原理，以及如何把建筑制图上升到艺术创作的基本要素。书中努力尝试如何把感情、理智、完美艺术、技术与经验溶于绘图的全过程之中。在《美国建筑师... 详细信息

ISBN: (数字)7541609617

ISBN: (纸本)7541609617

《美国建筑师入门教材：建筑绘图技巧与实例》经过精心安排，重点突出了建筑制图的基本原理，以及如何把建筑制图上升到艺术创作的基本要素。书中努力尝试如何把感情、理智、完美艺术、技术与经验溶于绘图的全过程之中。在《美国建筑师入门教材：建筑绘图技巧与实例》中，许多作品表现了我的绘画风格，另一些则再现巴黎美术学院派的经典表现技法和其他建筑师与艺术家的创作感受。

关键词：建筑制图学科:教材

来源：汇雅图书（南通市图书馆... 评论

在线全文

汇雅图书（南通市图书馆）

学校读者我要写书评

暂无评论

Acta Geologica Sinica(English Edition) 2013年第3期87卷 738-748页

作者： hüseyin KURT Kerim KOAK Kürsad ASAN Mustafa KARAKAS Department of Geological Engineering Seluk University central Anatolia Directorate of Mineral Research and Exploration

The Late cretaceous Uckapth Granitoid including mafic microgranular enclaves intruded into metapelitic and metabasic rocks, and overlain unconformably by Neogene ignimbrites in the Ni^de area of Turkey. It is mostly granite and minor granodiorite in composition, whereas its enclaves are dominantly gabbro with a few diorites in composition. The Uckapdl Granitoid is composed mainly of quartz, K-feldspar, plagioclase, biotite, muscovite and minor amphibole while its enclaves contain mostly plagioclase, amphibole, minor pyroxene and biotite. The Uckapth Granitoid has calcalkaline and peraluminous （AJcNK= 1.0-1.3） geochemical characteristics. It is characterized by high LILE/hFSE and LREE/hREE ratios （（La/Lu）N 3-33）, and has negative Ba, Ta, Nb and Eu anomalies, resembling those of comsion granitoids. The {）fkaplh Granitoid has relatively high STSr/S6Sr0） ratios （0.711189--0.716061） and low eNd（t） values （-5.13 to -7.13）, confirming crustal melting. In contrast, the enclaves are tholeiitic and metaluminous, and slightly enriched in LILEs （K, Rb） and Th, and have negative Ta, Nb and Ti anomalies; propose that they were derived from a subduction-modified mantle source. Based on mineral and whole rock chemistry data, the Uckapth granitoid is h-（hybrid） type, post-collision granitoid developed by mixing/mingllng processes between crustal melts and mantle-derived mafic magmas.

关键词： h-type granitoid mafic enclave geochemistry central Anatolia Turkey

维普期刊数据库

Automatic identification of crystal structures and interfaces via artificial-intelligence-based electron microscopy

在线全文

学校读者我要写书评

暂无评论

npj computational Materials 2023年第1期9卷 489-499页

作者： Andreas Leitherer Byung chul Yeo christian h.Liebscher Luca M.Ghiringhelli The NOMAD Laboratory at the Fritz-haber-Institut of the Max-Planck-Gesellschaft and IRIS-Adlershof of the humboldt-Universität zu Berlin BerlinGermany Department of Energy Resources Engineering Pukyong National UniversityBusan 48513Republic of Korea Max-Planck-Institut für Eisenforschung 40237 DüsseldorfGermany Physics Department and IRIS Adlershof Humboldt-Universität zu BerlinBerlinGermany Present address:Department of Materials Science and Engineering Friedrich-Alexander Universität Erlangen-NürnbergErlangenGermany

characterizing crystal structures and interfaces down to the atomic level is an important step for designing advanced *** electron microscopy routinely achieves atomic resolution and is capable to resolve complex arrangements of atoms with picometer ***,we present AI-STEM,an automatic,artificial-intelligence based method,for accurately identifying key characteristics from atomic-resolution scanning transmission electron microscopy(STEM)images of polycrystalline *** method is based on a Bayesian convolutional neural network(BNN)that is trained only on simulated ***-STEM automatically and accurately identifies crystal structure,lattice orientation,and location of interface regions in synthetic and experimental *** model is trained on cubic and hexagonal crystal structures,yielding classifications and uncertainty estimates,while no explicit information on structural patterns at the interfaces is included during *** work combines principles from probabilistic modeling,deep learning,and information theory,enabling automatic analysis of experimental,atomic-resolution images.

关键词： materials crystal estimates

Study on New Band Structures in Neutron-Rich 104Zr and 152Nd Nuclei

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

Study on New Band Structures in Neutron-Rich 104Zr and 152Nd...

第十三届全国核结构研讨会暨第九次全国“核结构与量子力学”专题讨论会

作者： E.Y.Yeoh J.h.hamilton A.V.Ramayya J.O.Rasmussen I.Y.lee Department of Physics Tsinghua UniversityBeijing 100084People’s Republic of China Department of Physics Vanderbilt UniversityNashvilleTennessee 37235USA Lawrence Berkeley National Laboratory BerkeleyCalifornia 94720USA

The neutron-rich Zr and Nd nuclei are located at A～100 and A～140 *** on the high spin states for these nuclei can provide valuable information of the nuclear *** previous publications,some levels and band structures have been reported in Zr and *** comparing to the neighboring nuclei,the information of the high spin states for these nuclei is still *** we report some new results of the high spin band structures of Zr and Nd.

关键词： spontaneous fission neutron-rich nuclei quasiparticle band

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

阅读训练对儿童早期字词意识发展的作用

心理科学 2002年第6期25卷 672-675页

作者：徐芬 Bruce homer Kang lee 北京师范大学认知科学与学习教育部重点实验室北京100875 New York University Queen’s University

该研究探讨了幼儿园中、大班及小学一、二年级儿童在完成字 /词意识任务上的年龄差异以及阅读训练对字 /词意识发展的影响。实验结果表明 :(1) 5岁儿童的字词意识尚处于不断的发展之中。 6岁及 7岁儿童的字意识发展已经达到了成熟水平 ... 详细信息

该研究探讨了幼儿园中、大班及小学一、二年级儿童在完成字 /词意识任务上的年龄差异以及阅读训练对字 /词意识发展的影响。实验结果表明 :(1) 5岁儿童的字词意识尚处于不断的发展之中。 6岁及 7岁儿童的字意识发展已经达到了成熟水平 ;但他们的词意识正处于不断的发展之中。 (2 )初级的阅读训练促进了5岁儿童字意识的发展 ,但对词意识的发展没有影响。 (3)小学语文教学对 6岁儿童的口头任务没有影响 ,但显著地促进了圈词任务成绩的提高。

关键词：阅读训练儿童早期字词意识作用词意识字意识发展元语言意识

维普期刊数据库

Facile synthesis of fully ordered L10-FePt nanoparticles with controlled Pt-shell thicknesses for electrocatalysis

在线全文

学校读者我要写书评

暂无评论

Nano Research 2017年第8期10卷 2866-2880页

作者： Yonghoon hong hee Jin Kim Daehee Yang Gaehang lee Ki Min Nam Myung-hwa Jung Young-Min Kim Sang-II choi Won Seok Seo Department of chemistry Sogang University Seou104107 Republic of Korea Department of chemistry and Green-Nano Materials Research center Kyungpook National University Daegu 41566 Repubfic of Korea Korea Basic Science Institute and University of Science and Technology Daejeon 34133 Republic of Korea Department of chemistry Mokpo National University Jeonnam 58554 Republic of Korea Department of Physics Sogang University Seoul 04107 Republic of Korea center for Integrated Nanostructure Physics Institute for Basic Science (IBS) Suwon 16419 Repubfic of Korea Department of Energy Science Sungkyunkwan University (SKKU) Suwon 16419 Republic of Korea

We report a simple one-step approach for the synthesis of -4 nm uniform and fully L10-ordered face-centered tetragonal （fct） FePt nanoparticles （NPs） embedded in -60 nm McM-41 （fct-FePt NPs@McM-41）. We controlled the Pt-shell thickness of the fct-FePt NPs by treating the fct-FePt NPs@McM-41 with acetic acid （hOAc） or hydrochloric acid （hc1） under sonicafion, thereby etching the surface Fe atoms of the NPs. The fct-FePt NPs deposited onto the carbon support （fct-FePt NP/c） were prepared by mixing the fct-FePt NPs@McM-41 with carbon and subsequently removing the McM-41 using NaOh. We also developed a facile method to synthesize acid-treated fct-FePt NP/c by using a hF solution for simultaneous surface-Fe etching and McM-41 removal. We studied the effects of both surface-Fe etching and Pt-shell thickness on the electrocatalytic properties of fct-FePt NPs for the methanol oxidation reaction （MOR）. compared with the non-treated fct-FePt NP/c catalyst, the hOAc-treated and hcl-treated catalysts exhibit up to 34% larger electrochemically active surface areas （EcASAs）; in addition, the hcl-treated fct-FePt NP （with -1.0 nm Pt shell）/c catalyst exhibits the highest specific activity. The hF-treated fct-FePt NP/c exhibits an EcASA almost 2 times larger than those of the other acid-treated fct-FePt NP/c catalysts and shows the highest mass activity （1,435 mA·mgPt^-1, 2.3 times higher than that of the commercial Pt/c catalyst） and stability among the catalysts tested. Our findings demonstrate that the surface-Fe etching for the generation of the Pt shell on fct-FePt NPs and the Pt-shell thickness can be factors for optimizing the electrocatalysis of the MOR.

关键词： FePt face centered tetragonal bimetallic methanol oxidation reaction electrocatalysts

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

恋爱的秘诀如何征服你的心上人