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Search Results: 1 - 10 of 32890 matches for " Jianting GUO "
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Overview of Sub-synchronous Oscillation in Wind Power System  [PDF]
Han Chen, Chunlin Guo, Jianting Xu, Pengxin Hou
Energy and Power Engineering (EPE) , 2013, DOI: 10.4236/epe.2013.54B087
Abstract:

Nowadays with the improvement in the degree of emphasis on new energy, the wind power system has developed more and more rapidly over the world. Usually the wind plants are located in the remote areas which are far from the load centers. Generally series compensated AC transmission and high voltage DC transmission are made use of to improve the transmission capacity as two main effective ways which can solve the problem of large scale wind power transmission. The paper describes the three kinds of impact varieties and impact mechanisms in the sub-synchronous oscillation phenomena of wind power system based on doubly fed induction generator (DFIG) wind generators. At last, we point out the important problem that should be stressed in the wind power system.

Influence of Hot Isostatic Pressing on Microstructuresand Properties of NiAl/Cr(Mo)-TiC in-situMultiphase Composites
Dongtao JIANG,Jianting GUO,

材料科学技术学报 , 1998,
Abstract: A novel in-situ multiphase NiAl-based composite was investigated on its microstructures and properties influenced by HIP treatment. In the as- processed composites, a fine array of NiAl precipitates was found to be distributed in Cr(Mo) phase. TiC particles tended to segregate at grain or phase boundaries. In addition, a number of dislocations were observed to exist in NiAl grains meanwhile fewer in Cr(Mo) grains. Little change in the morphology was found except that nearly fully densification was achieved. Some changes in microstructures were notable including coarsening of NiAl precipitates in Cr(Mo) phase and increase in dislocation density in NiAl phase.After HIP, the strength of the composites increased significantly compared with the as-processed composites. The reason for the enhanced Strength of the composites is also discussed.
Preliminary Investigation of NiAl-TiB2 Composite Prepared by Reaction Milling
Preliminary Investigation of NiAl-TiB_2 Composite Prepared by Reaction Milling

Lanzhang ZHOU,Jianting GUO,

材料科学技术学报 , 1999,
Abstract: 1.IntroductionLackofductilityatroomtemperatureandpoorcreepstrengthathightemperatureslimittheap-plicationofB2NiA1ashightemperaturestructuralmaterialsl1~5].Ofvariousattemptstoimproveambi-enttemperatureductility,grainrefinementhasbeensuggestedtobeawayofobtainingductilityofNiAl,forinstance,Schulson6]reportedgrainsizehadacrit-icaleffectontensileductilityofNiAl,i.e.whentl1egrainsizewaslessthan2Opm,thetensileductilityat4oO'Cincreasedsignificantl},,andtheauthorsllg-geststhatifthegrainsizeisfurthe…
Formation Mechanism of NiAl/TiB_2 Nanocomposite by Mechanical Alloying Elemental Powders
Lanzhang ZHOU,Jianting GUO,

材料科学技术学报 , 1998,
Abstract: A NiAl/TiB2 nanocomposite is synthesized by mechanical alloying elemental powders. Upon milling for a certain time, an abrupt exothermic reaction occurs and a large amount of NiAl and TiB2 compounds form simultaneously. It is suggested that two separate chemical reactions,i.e. Ni+Al →NiAl and Ti+2B→TiB2, are involved during the exothermic reaction. Additionof Ti and B to Ni-Al system impedes the structural evolution of Ni and Al powders and delays the abrupt reaction. The final products are equilibrium phases without any metastable phases formed. This type of reaction is suggested to be suitable for alloy systems with two large heatrelease reactions.
CORROSION FATIGUE BEHAVIOUR OF 1Cr18Ni9Ti STEEL IN BOILING 45% MgCl_2 SOLUTION

BAI Yuankai,GUO Jianting,

金属学报 , 1986,
Abstract: The stainless steel 1Cr18Ni9Ti corrodes severely in the boiling 45% MgCl_2 solution. But an improvement on strength and prolongation of rupture time under stress corrosion are obviously shown if it undergoes an application of alternating stress, saying, 20 to 39 MPa, superposing to the static stress. The smaller the static stress, the more obvious the effect is. Even the alternating stress increases up to 68 MPa, it does not shorten any more rupture time. Since the machine parts are quite difficult to operate under no mechanical vibration, it seems to be available for elongating the rupture life of which the machinery runs under corrosive medium with an additional alternating stress controlled within a narrow limit.
Mechanism of Macroalloying-induced Ductility in Ni_3Al
Changgong MENG,Jianting GUO,Zhuangqi HU,

材料科学技术学报 , 1994,
Abstract: The bonding characteristics of Ni3Al doped with ternary elements has been investigated by means of the discrete variational Xα (DV-Xα) cluster method. From the computations. the addition of ternary element M (M= Pd. Ag. Cu and Co) substituting for the Ni sttes leads to the increase of delocalized bonding electrons. and the mechanism of ductilization of Ni3Al bV doping with M is explained based on the analysis of bonding characteristics. The increase of delocalized bonding electrons lowers the covalent bond directionality and strengthens grain boundary. The difference of strength between M-Al bond and M-Ni bond is an important factor in the effect of alloy stoichiometry on ductility. The larger the difference. the more the sensitivity to the alloy stoichiometry
Microstructural Stability of a Multiphase Ni-25Al-15Cr (at. pct) Intermetallic Alloy
Rongshi CHEN,Jianting GUO,Jiyang ZHOU,

材料科学技术学报 , 1999,
Abstract: 1.IntroductionAlthoughtherehasbeenconsiderableworkontheeffectofsuchfactorsasalloycomposition,deviationfromstoichiometryandternaryalloyadditionsontheductilityandfracturebehaviorofsinglephaseNiAlalloyslll2l,therecenttrendhasbeentowardsthestudyofmultiphaseintermetallicalloywithcon-trolledmicrostructuresandphase.onstitu.nt3ro5].Atypicalexampleofachievinghighroomtemperatureductilitybymicrostructurecontrolisthewell-knowncaseofNi-2OAl-3OFe(at.pct)multiphaseNiAl-basedalloyI4'5].ThemultiphaseNiAl…
Evolution of Microstructure and Mechanical Property during Long-Term Aging in Udimet 720Li

Lanzhang ZHOU,Valentino LUPINC,Jianting GUO,

材料科学技术学报 , 2001,
Abstract:
Transcriptome Sequencing and Comparative Analysis of Saccharina japonica (Laminariales, Phaeophyceae) under Blue Light Induction
Yunyan Deng, Jianting Yao, Xiuliang Wang, Hui Guo, Delin Duan
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0039704
Abstract: Background Light has significant effect on the growth and development of Saccharina japonica, but there are limited reports on blue light mediated physiological responses and molecular mechanism. In this study, high-throughput paired-end RNA-sequencing (RNA-Seq) technology was applied to transcriptomes of S. japonica exposed to blue light and darkness, respectively. Comparative analysis of gene expression was designed to correlate the effect of blue light and physiological mechanisms on the molecular level. Principal Findings RNA-seq analysis yielded 70,497 non-redundant unigenes with an average length of 538 bp. 28,358 (40.2%) functional transcripts encoding regions were identified. Annotation through Swissprot, Nr, GO, KEGG, and COG databases showed 25,924 unigenes compared well (E-value <10?5) with known gene sequences, and 43 unigenes were putative BL photoreceptor. 10,440 unigenes were classified into Gene Ontology, and 8,476 unigenes were involved in 114 known pathways. Based on RPKM values, 11,660 (16.5%) differentially expressed unigenes were detected between blue light and dark exposed treatments, including 7,808 upregulated and 3,852 downregulated unigenes, suggesting S. japonica had undergone extensive transcriptome re-orchestration during BL exposure. The BL-specific responsive genes were indentified to function in processes of circadian rhythm, flavonoid biosynthesis, photoreactivation and photomorphogenesis. Significance Transcriptome profiling of S. japonica provides clues to potential genes identification and future functional genomics study. The global survey of expression changes under blue light will enhance our understanding of molecular mechanisms underlying blue light induced responses in lower plants as well as facilitate future blue light photoreceptor identification and specific responsive pathways analysis.
Influence of Fe on electronic density of defects in NiAl alloys
Wen Deng,Liangyue Xiong,Shuhe Wang,Jianting Guo,Qiwei Long
Chinese Science Bulletin , 1997, DOI: 10.1007/BF02882642
Abstract: The addition of Fe element to NiAl results in the increase of the density of free electrons in the bulk and the grain boundary when Fe atoms substitute for Al atoms. Fe is a benefit element to improving the structure of the grain boundary and the brittleness of NiAl alloy.
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