检索结果-南通市图书馆

Transactions of Nonferrous Metals Society of China 2024年第6期34卷 1759-1773页

作者： Rostislav KRÁLÍK Barbora KŘIVSKÁ Lucia BAJTOŠovÁ Mykhailo STOLBCHeNKO Mirko SCHAPeR Olexandr GRYDIN Miroslav CIeSLAR Department of Physics of Materials Faculty of Mathematics and PhysicsCharles UniversityKe Karlovu 512116PragueCzech Republic Department of Materials Science Faculty of Mechanical EngineeringUniversity of PaderbornWarburger Straße 10033098PaderbornGermany

提出制备含Sc的Al−Cu−Li−Mg−Zr基合金带材的工艺方案。即先采用双辊铸轧技术制备近净形状的3 mm厚带材,再对其进行均匀化/固溶处理。研究两种Al−Cu−Li−Mg−Zr基双辊铸轧合金,其中一种添加质量分数为0.17%的Sc,另一种未添加Sc。两种合金... 详细信息

提出制备含Sc的Al−Cu−Li−Mg−Zr基合金带材的工艺方案。即先采用双辊铸轧技术制备近净形状的3 mm厚带材,再对其进行均匀化/固溶处理。研究两种Al−Cu−Li−Mg−Zr基双辊铸轧合金,其中一种添加质量分数为0.17%的Sc,另一种未添加Sc。两种合金均先在300℃下退火30 min,然后在450℃下退火30 min以及530℃下退火30 min,随后进行室温水淬。前两段退火后组织中生成了细小、弥散的Al_(3)Zr/Al_(3)(Sc,Zr)颗粒。最后的退火步骤起到了均匀化/固溶处理的作用。双辊铸轧材料的细小晶粒结构使含有主要合金元素的原始颗粒在较短的退火时间内溶解。缩短保温时间可以限制表面层中Li的耗尽和Al_(3)Zr/Al_(3)(Sc,Zr)弥散相的明显粗化。铸态含Sc材料已经具有明显细小的晶粒结构,而经均匀化/固溶处理后生成的Al_(3)(Sc,Zr)弥散相抑制了晶粒在高温下发生粗化。在后续180℃下时效处理后,形成了θʹ(Al_(2)Cu)、T1(Al_(2)CuLi)和S'(Al_(2)CuMg)强化相。在峰值时效状态下,屈服强度提高了200 MPa,这一数值与类似直接冷却铸造材料的相当,从而证实了所提方案的合理性。

关键词：显微组织力学性能 Al−Cu−Li基合金 Sc合金化双辊铸轧

同方期刊数据库

Long-term survival of a patient after resection of a gastrointestinal stromal tumor arising from the pancreas

在线全文

学校读者我要写书评

暂无评论

Hepatobiliary & Pancreatic Diseases International 2011年第3期10卷 330-332页

作者： Filip eka Bohumil Jon Alexander Ferko Zdeněk ubrt Dimitar H Nikolov Věra Tyová Department of Surgery Faculty of Medicine and University Hospital Hradec Králové Department of Field Surgery Military Health Science FacultyHradec KrálovéDefence University Brno Fingerland Department of Pathology

BACKGROUND:Gastrointestinal stromal tumors (GISTs) may arise in any part of the gastrointestinal tract;extragastrointestinal locations are extremely *** a few cases of extragastrointestinal stromal tumor arising from the pancreas were *** of the reports described a long-term follow-up of the ***:This report describes an interesting and unusual case of GIST arising from the ***:A 74-year-old female presented with a palpable abdominal *** scan showed a large mass 11×8×4 cm originating from the tail of the *** biopsy revealed a GIST predominantly with spindle cells,but some parts also contained epitheloid *** patient was treated by distal pancreatic resection with *** of the tumor showed a staining pattern characteristic of *** patient has achieved a long-term survival of five years and six months without any sign of recurrence of the ***:This is the first reported case of an extragastrointestinal stromal tumor arising from the pancreas treated surgically,with a long-term survival.

关键词： gastrointestinal stromal tumor pancreas survival

High-resolution genome-wide association study of a large Czech collection of sweet cherry (Prunus avium L.) on fruit maturity and quality traits

在线全文

学校读者我要写书评

暂无评论

Horticulture Research 2023年第1期10卷 113-127页

作者： Kateřina Holušová JanaČmejlová Pavol Suran RadekČmejla JiříSedlák Lubor Zelený Jan Bartoš Centre of the Region Hanáfor Biotechnological and Agricultural Research Institute of Experimental Botany of the Czech Academy of Sciencesšlechtitelu 31Olomouc77900Czech Republic Research and Breeding Institute of Pomology Holovousy Ltd. Holovousy 129Holovousy50801Czech Republic

In sweet cherry(Prunus avium L.),quantitative trait loci have been identified for fruit maturity,colour,firmness,and size to develop markers for marker-assisted ***,resolution is usually too low in those analyses to directly target candidate genes,and some associations are *** contrast,genome-wide association studies are performed on broad collections of accessions,and assemblies of reference sequences from Tieton and Satonishiki cultivars enable identification of single nucleotide polymorphisms after whole-genome sequencing,providing high marker *** hundred and thirty-five sweet cherry accessions were sequenced and phenotyped for harvest time and fruit colour,firmness,and ***-wide association studies were used to identify single nucleotide polymorphisms associated with each trait,which were verified in breeding material consisting of 64 additional accessions.A total of 1767106 single nucleotide polymorphisms were *** that density,significant single nucleotide polymorphisms could be linked to co-inherited haplotype blocks(median size∼10 kb).Thus,markers were tightly associated with respective phenotypes,and individual allelic combinations of particular single nucleotide polymorphisms provided links to distinct *** addition,yellow-fruit accessions were sequenced,and a∼90-kb-deletion on chromosome 3 that included five MYB10 transcription factors was associated with the ***,the study confirmed numerous quantitative trait loci from bi-parental populations using high-diversity accession populations,identified novel associations,and genome-wide association studies reduced the size of trait-associated loci from megabases to kilobases and to a few candidate genes per ***,a framework is provided to develop molecular markers and evaluate and characterize genes underlying important agronomic traits.

关键词： fir breeding maturity

Vertex-antimagic Labelings of Regular Graphs

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

Acta Mathematica Sinica,english Series 2012年第9期28卷 1865-1874页

作者： Ali AHMAD Kashif ALI Martin BACA Petr KovAR Andrea SeMANICovA-FeNovCíKovA College of Computer Science and Information Systems Jazan University Faculty of Mathematics COMSATS Institute of Information Technology Department of Applied Mathematics and Informatics Technical University Department of Applied Mathematics VB-Technical University of Ostrava

Let G = （V, e） be a finite, simple and undirected graph with p vertices and q edges. An （a, d）-vertex-antimagic total labeling of G is a bijection f from V（G） t2 e（G） onto the set of consecutive integers 1, 2,... ,p ＋ q, such that the vertex-weights form an arithmetic progression with the initial term a and difference d, where the vertex-weight of x is the sum of the value f（x） assigned to the vertex x together with all values f（xy） assigned to edges xy incident to x. Such labeling is called super if the smallest possible labels appear on the vertices. In this paper, we study the properties of such labelings and examine their existence for 2r-regular graphs when the difference d is 0, 1,..., r ＋ 1.

关键词： Super vertex-antimagic total labeling vertex-antimagic edge labeling regular graph

用于伏尔加河地区矮秆春小麦育种的Rht基因的研究和选择

在线全文

学校读者我要写书评

暂无评论

华中农业大学学报 2000年第3期19卷 209-212页

作者： Loba.,YV Kurp.,ov 俄罗斯萨拉托夫州立农业大学生物工程与植物遗传育种系俄罗斯萨拉托夫州东南地区农科所

对小麦品系Ｓａｒａｔｏｖｓｋａｙａ２９的不同Ｒｈｔ等位的一套近等基因系进行了田间试验，以测定６个矮杆基因的育种值。在不灌溉、灌溉并施用不同剂量的肥料（Ｎ１２０，Ｐ１００，Ｋ６０和Ｎ１８０，Ｐ１６０，Ｋ１００）三种条件... 详细信息

对小麦品系Ｓａｒａｔｏｖｓｋａｙａ２９的不同Ｒｈｔ等位的一套近等基因系进行了田间试验，以测定６个矮杆基因的育种值。在不灌溉、灌溉并施用不同剂量的肥料（Ｎ１２０，Ｐ１００，Ｋ６０和Ｎ１８０，Ｐ１６０，Ｋ１００）三种条件下测定Ｒｈｔ基因对株高、产量及产量构成因子、品质的影响。结果表明，Ｒｈｔ基因可以用于伏尔加河地区条件下魏杆小麦品系的选育。

关键词：春小麦产量品质矮杆基因育种值

Virome identification in wheat in the Czech Republic using small RNA deep sequencing

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Agriculture 2020年第7期19卷 1825-1833页

作者： Khushwant SINGH Jana JAROSovA Jan FOUSeK CHeN Huan Jiban Kumar KUNDU Plant Virus and Vector Interactions Group Division of Crop Protection and Plant HeatthCrop Research InstitutePrague 16106Czech Republic Zhejiang Tianke High-Technology Development Co. Ltd.Hangzhou 310012P.R.China

High-throughput deep-sequencing technology and bioinformatics analysis of the small RNA(sRNA)population isolated from plants allows universal virus detection and complete virome reconstruction for a given *** the present sRNA deep-sequencing analysis of virus-infected wheat samples in the Czech Republic,samples were firstly tested for barley yellow dwarf viruses(BYDVs),wheat streak mosaic virus(WSMV)and wheat dwarf virus(WDV)using eLISA,RT-PCR and *** sRNA sequencing of these samples yielded more than^60 million single-end 50-bp reads with high confidence for nine field samples of ***,16.5%of reads were virus-specific and 83.5%were mapped to the *** 21-nt reads(-7.7e+06 reads)were found than 24-nt(~6.20e+06 reads)or 22-nt(-4.30e+06 reads)*** novo assembly of the high-quality contigs revealed the presence of three earlier repoted viruses in the Czech Republic:BYDVs(31.48%),WSMV(24.23%)and WDV(2666%).We also showed the presence of cereal yellow dwarf virus(14.33%;two species CYDV-RPS and CYDV-RPV family Luteoviridae/Polerovirus)and wheat yellow dwarf virus(WYDV,3.30%;Luteoviridae).Phylogenetic analysis showed CYDV and WYDV grouped separately from ***,several recombination breakpoints were found among the groups of yellow dwarf viruses(BYDVs,CYDV,and WYDV).Using RNA deep sequencing,we confirmed the presence of the three known viruses(BYDVs,WSMV,and WDV)and the first record of two species of CYDV and WYDV in wheat in the Czech Republic.

关键词： NGS sRNA BYDVs CYDV WSMV WYDV WDV

在线全文

学校读者我要写书评

暂无评论

饲料中牛特异性DNA的鉴定

环境卫生学杂志 2001年第3期28卷 189-190页

作者： Kr mái Ｐ Ren ová e 王勇牛胜田

PNAS：科学焉已在蝙蝠机体中发现白血病病毒的史前祖先

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

现代生物医学进展 2017年第11期17卷 I0002-I0002页

作者： Helena Farkašová[a], Tomáš Hron[a], Jan Pačes[b] Pavel Hulva[c],[d] Petr Benda[c],[e] Robert James Gifford[f], Daniel elleder[a], [a]Laboratory of Viral and Cellular Genetics Institute of Molecular Genetics The Czech Academy of Sciences Prague 14220 Czech Republic [b]Laboratory of Genomics and Bioinformatics Institute of Molecular Genetics The Czech Academy of Sciences Prague 14220 Czech Republic [c]Department of Zoology Charles University Prague 12844 Czech Republic [d]Department of Biology and ecology University of Ostrava Ostrava 71000 Czech Republic [e]Department of Zoology National Museum (Natural History) Prague 11579 Czech Republic [f]MRC-University of Glasgow Centre for Virus Research Glasgow G12 8TA United Kingdom

近日,一项刊登在国际杂志PNAS上的研究报告中,来自格拉斯哥大学和捷克科学院的研究人员通过研究在蝙蝠的基因组中发现了引发罕见类型白血病的病毒家族的古老DNA痕迹。

关键词：白血病病毒科学院蝙蝠祖先机体研究人员 DNA 基因组

Measurements of Pulsed 532 nm Laser Breakdown Spectroscopy of Synthesized Magnetite Nanoferrofluid

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

World Journal of Nano Science and engineering 2018年第3期8卷 39-55页

作者： Mohammad e. Khosroshahi Maryam Tajabadi Laser and Nanobiophotonics Laboratory Biomaterial Group Faculty of Biomedical Engineering Amirkabir University of Technology Tehran Iran MIS-electronics Nanobiophotonics and Biomedical Research Laboratory Richmond Hill Canada Department of Mechanical and Industrial engineering University of Toronto Toronto Canada School of Metallurgy and Materials engineering Iran University of Science and Technology Tehran Iran

We describe the results of 532 nm pulse laser-induced breakdown spectroscopy (LIBS) of two samples of magnetite nanoparticles (SPIONs) nanoferrofluid synthesized at room (S1) and elevated temperatures (S2) and at three different laser energy levels and pulse frequency. The size of magnetite nanoparticles, size distribution, magnetic crystalline phase and magnetization were analyzed and measured using transmission electron microscopy (TeM), X-ray diffraction spectroscopy (XRD) and vibrating sample magnetometry (VSM). The SPIONs showed a distribution between 4 - 22 nm with a peak about 12 nm and saturation magnetization of about 65 emu/g. The Saha-Boltzmann analysis of spectra for medium energy level (1050 mJ) yields plasma temperatures of (3881 ± 200) K and (26,047 ± 200) K for Fe I and ov as the lowest and highest temperatures respectively. A range of corresponding electron density (Ne-) of (0.47 - 6.80) × 1020, (0.58 - 8.30) × 1020 and (0.69 - 9.96) × 1020 cm-3?were determined at 860, 1050 and 1260 mJ respectively using the estimated CCD pictures. The results confirmed a higher elements ratio for S1 than S2 and the signal intensity indicated a non-linear behaviour as a function of pulse frequency with the maximum ratio value at 3 Hz. At higher frequency of 6 Hz no such turning point was observed. The highest and lowest temperatures corresponded to Fe I and ov respectively. The LIBS technique can be utilized to study, characterize and determine the elements ratio required in most applications involving the synthesizing process.

关键词： Laser-Induced Breakdown Spectroscopy Second Harmonic Generation SPION Nanoferrofluid elements Ratio