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First-Principles Study of Phase Stability and Mechanical Property of Co_3(Al,W) Precipitates with Different Ratio of Al to W in Co Base Alloys

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稀有金属材料与工程 2009年第A03期38卷 1-4页

作者： Yao q su X M Yan Y Zhao L W sun J Shanghai Jiaotong University Shanghai 200240 China

The energetics, electronic structure and mechanical property of Co3(Al,W) precipitates with different ratio of Al to W in Co base alloys were investigated by the method of supercell and augmented plane waves plus local orbitals within generalized gradient approximation. The calculated results show that the L12 Co3(Al,W) precipitate is the most stable when the ratio of Al to W is equal to 1. When the content of W is higher than 18.5 at%, the L12 and hexagonal structures co-exist in Co3(Al,W) precipitates at 1173 K. It is also shown that the L12 ordered Co3(Al,W) precipitates have an obvious strengthening effect in the disordered fcc cobalt matrix.

关键词：铝电子结构力学性能碳酸

Cleaning Radio Frequency Interference in Pulsar-Folded Data Based on the Conditional Random Fields with an Adaptive Prior

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Research in Astronomy and Astrophysics 2023年第10期23卷 184-191页

作者： Xue Chen J.L.Han W.q.su Z.L.Yang D.J.Zhou National Astronomical Observatories Chinese Academy of SciencesBeijing 100101China School of Astronomy and Space Science University of Chinese Academy of SciencesBeijing 100049China CAS Key Laboratory of FAST NAOCChinese Academy of SciencesBeijing 100101China

Radio astronomy observations are frequently impacted by radio frequency interference(RFI).We propose a novel method,named 2σCRF,for cleaning RFI in the folded data of pulsar observations,utilizing a Bayesian-based model called conditional random fields(CRFs).This algorithm minimizes the“energy”of every pixel given an initial *** standard deviations(i.e.,rms values)of the folded pulsar data are utilized as pixels for all subintegrations and ***-RFI data without obvious interference is treated as“background noise,”while RFI-affected data have different classes due to their exceptional rms *** initial labeling can be automated and is adaptive to the actual *** CRF algorithm optimizes the label category for each pixel of the image with the prior initial *** demonstrate the efficacy of the proposed method on pulsar folded data obtained from Five-hundred-meter Aperture Spherical radio Telescope *** can effectively recognize and tag various categories of RFIs,including broadband or narrowband,constant or instantaneous,and even weak RFIs that are unrecognizable in some pixels but picked out based on their *** results are comparable to those obtained via manual labeling but without the need for human intervention,saving time and effort.

关键词： methods:data analysis techniques:image processing (stars:)pulsars:general

DECOMPOSITION BASED IMAGING WITH FIBER AND CCD CAMERA DETECTIONS

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Journal of Innovative Optical Health Sciences 2008年第1期1卷 115-124页

作者： S.D.CAMPBELL I.L.GOODIN S.D.GROBE q.su R.GROBE Intense Laser Physics Theory Unit and Department of Physics Illinois State University Normal IL 61790-4560 USA

We generalize a previously proposed imaging scheme to situations for which the set of hidden objects embedded in the highly scattering medium can take arbitrary *** compare the accuracy of images obtained from optical detection fibers with those from a ccd *** latter approach is more efficient and can be applied to non-contact geometries,but it requires an a priori linearization of the obtained digitized *** discuss some details of this calibration for the camera and establish its potential as a new tool for decomposition based imaging.

关键词： scattering details fibers

EFFECT OF CHROMIUM AND BORON ON ENVIRONMENTAL EMBRITTLEMENT OF FORGED Fe_3Al

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Acta Metallurgica Sinica(English Letters) 1997年第3期10卷 188-191页

作者： J.q. su S.J Gao and Z.q. Hu (Liaoning Key Laboratory for Materials and Hydrogen, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110015, China)(National Key Laboratory for RSA, Institute of Metal Research, Chinese Academy of Sciences, Inst of Metal Research Chinese Acad of Sciences Shenyang China

The effects of addition of chromium or boron on room temperature tensile properties,fracture behavior and susceptibility to test environments (air vs. vacuuwi of forged Fe3Al have been investigated. The results indicated that both chromium and boron result in increasing room temperuture ductility and fracture strength of the Fe3Al alloy whether tested in air or in vacuum. The susceptibility to test envimnment was described with the embrittlement index I: I=(δv-δA)/δv. The embrittlement indexes, for Fe-30Al, Fe-30Al-4Cr and Fe-30Al-0. 13B (at. %), are 24%, 37% and 29%,respectively. Scanning electron microscope examination of fracture surface revealed that the fracture mode of the three alloys remains unchanged, and all of them exhibited a transgranular cleavage fracture mode when tested in vacuum or air.

关键词： chromium boron Fe_3Al enviromental embrittlement

FAST Pulsar *** Profiles of 682 Pulsars

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Research in Astronomy and Astrophysics 2023年第10期23卷 71-175页

作者： P.F.Wang J.L.Han J.Xu C.Wang Y.Yan W.C.Jing W.q.su D.J.Zhou T.Wang National Astronomical Observatories Chinese Academy of SciencesBeijing 100101China School of Astronomy University of Chinese Academy of SciencesBeijing 100049China

Pulsar polarization profiles form a very basic database for understanding the emission processes in a pulsar *** careful polarization calibration of the 19-beam L-band receiver and verification of beamoffset observation results,we obtain polarization profiles of 682 pulsars from observations by the Five-hundredmeter Aperture Spherical radio Telescope(FAST)duringthe Galactic Plane Pulsar Snapshot survey and other normal FAST *** them,polarization profiles of about 460 pulsars are observed for the first *** profiles exhibit diverse *** pulsars have a polarization position angle curve with a good S-shaped swing,some with orthogonal modes;some have components with highly linearly polarized components or strong circularly polarized components;some have a very wide profile,coming from an aligned rotator,and some have an interpulse from a perpendicular rotator;some wide profiles are caused by interstellar *** derive geometric parameters for 190 pulsars from the S-shaped position angle curves or with orthogonal *** find that the linear and circular polarization or the widths of pulse profiles have various frequency *** with a large fraction of linear polarization are more likely to have a large Edot.

关键词： polarization (stars:)pulsars:general astronomical databases:miscellaneous

Multi-level simulation platform of SOFC-GT hybrid generation system

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Multi-level simulation platform of SOFC-GT hybrid generation...

Phased Array Feed Experiments and Galactic HI Observations

第九届全国氢能学术会议

作者： C.Bao,Y.X.Shi,C.Li,N.S.Cai,q.q.su University of Science & Technology Beijing,China

＜正＞Based on the commercial environment of gPROMS,a self-developed simulation platform of natural gas internal reforming Solid Oxide Fuel Cell（IR-SOFC）-Gas Turbine（GT） hybrid generation system was *** fully reflected the concept of multi-level *** example,for the core unit of SOFC,it included the advanced electrochemical model which is

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Research in Astronomy and Astrophysics 2023年第8期23卷 297-307页

作者： B.Liu H.W.Xi D.J.Ding Z.W.Wang S.H.Yu Y.Zhu L.Yu X.Zhang J.L.Li L.J.Liu q.su Y.Wu C.J.Jin B.Peng National Astronomical Observatories Chinese Academy of SciencesBeijing 100101China Key Laboratory of Radio Astronomy and Technology Chinese Academy of SciencesBeijing 100101China School of Astronomy and Space Science University of Chinese Academy of SciencesBeijing 100049China The 54th Research Institute of China Electronic Technology Group Cooperation Shijiazhuang 050081China

The Phased Array Feed(PAF)is considered as one of the next generation receivers for radio telescopes,which can significantly enlarge the instantaneous Field-of-View of large aperture single dish radio telescopes and enable more flexible observing *** efforts on PAF development for radio telescopes have been made for more than two decades and have become more and more *** report the development of an ambient-temperature 19 element L-band PAF system and the experimental results including its far field beam pattern and system temperature measurement,which achieve the *** the aperture array beam-forming method,we demonstrate a wide-field Galactic HI observations in the radio camera *** results indicate that this system might be applicable for strong Galactic transient *** system could be directly equipped to large telescopes like the Five-hundred-meter Aperture Spherical radio Telescope(FAST)and FAST array in the future.

关键词： instrumentation detectors-techniques imaging spectroscopy-line profiles

Structure and Properties of a Novel Nd(Ⅲ) Coordination Polymer With Bipyridyl Tetracarboxylate

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Structure and Properties of a Novel Nd(Ⅲ) Coordination Poly...

第六届国际稀土开发与应用研讨会

作者： J.Y.YAO,M.HU~*,H.q.su~* School of Chemistry and Chemical Engineering,Inner Mongolia University,Hohhot 010021, P.R.China

A novel coordination Polymer,[Nd(Hbptc)(H

关键词： crystal structure photoluminescence

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CAI MI

师范教育 1992年第1期 33-33页

作者： suēng qín