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Textures and Properties of Hot Rolled High Strength Ti-IF Steels

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Journal of Iron and Steel Research International 2008年第5期15卷 70-76页

作者： guo Yan-hui wang Zhao-dong ZOU Wen-wen LIU Xiang-hua wang guo-dong State Key Laboratory of Rolling and Automation Northeastern University Shenyang 110004 Liaoning China

The texture evolution in a high strength Ti-IF steel during the processing of hot rolling, cold rolling, and annealing is studied. For comparison, both ferrite rolling and austenite rolling are employed. It is found that the texture type is the. same after ferrite rolling and austenite rolling, but the texture intensity is much higher in the ferrite rolled sample. Furthermore, texture characteristics at the surface are absolutely different from those at the mid sec tion in both ferrite rolled and austenite rolled samples, as well as under the cold rolled and annealed conditions. The shear texture { 110 } 〈001 〉 disappears and orientation rotates along { 110 } 〈001 〉→ { 554 } 〈 225 〉→ { 111 } 〈 112 〉→{111}〈110〉→{223}〈110〉 during cold rolling. Compared to the austenite rolled sample, the properties of the cold rolled and annealed sheet which is subjected to ferrite rolling are higher.

关键词： high strength Ti-IF steel ferrite rolling austenite rolling texture

Complete Your Mobility： Linking Trajectories Across Heterogeneous Mobility Data Sources

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Journal of Computer Science & Technology 2018年第4期33卷 792-806页

作者： guo-Wei wang Jin-Dou Zhang Jing Li School of Computer Science and Technology University of Science and Technology of China Hefei 230026 China

Nowadays, human activities and movements are recorded by a variety of tools, forming different trajectory sets which are usually isolated from one another. Thus, it is very important to link different trajectories of one person in different sets to provide massive information for facilitating trajectory mining tasks. Most prior work took advantages of only one dimensional information to link trajectories and can link trajectories in a one-to-many manner （providing several candidate trajectories to link to one specific trajectory）. In this paper, we propose a novel approach called one-to-one constraint trajectory linking with multi-dimensional information （OCTL） that links the corresponding trajectories of one person in different sets in a one-to-one manner. We extract multidimensional features from different trajectory datasets for corresponding relationships prediction, including spatial, temporal and spatio-temporal information, which jointly describe the relationships between trajectories. Using these features, we calculate the corresponding probabilities between trajectories in different datasets. Then, we formulate the link inference problem as a bipartite graph matching problem and employ effective methods to link one trajectory to another. Moreover, the advantages of our approach are empirically verified on two real-world trajectory sets with convincing results.

关键词： trajectory linking trajectory data mining trajectory similarity mobility pattern mining

Optical identification of radio-loud active galactic nuclei in the ROSAT-Green-Bank sample with SDSS spectroscopy

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Research in Astronomy and Astrophysics 2009年第10期9卷 1078-1102页

作者： De-Liang wang Jian-guo wang Xiao-Bo Dong National Astronomical Observatories / Yunnan Observatory Chinese Academy of SciencesKunming 650011 China Graduate University of the Chinese Academy of Sciences Beijing 100039 China Center for Astrophysics University of Science and Technology of China Hefei 230026 China

Results of extended and refined optical identification of 181 radio/X-ray sources in the RASS-Green Bank （RGB） catalog are presented （Brinkmann et al. 1997） which have been spectroscopically observed in the Sloan Digital Sky Survey （SDSS） DR5. The SDSS spectra of the optical counterparts are modeled in a careful and selfconsistent way by incorporating the host galaxy＇s starlight. Optical emission line parameters are presented, which are derived accurately and reliably, along with the radio 1.4- 5 GHz spectral indices estimated using （non-simultaneous） archival data. For 72 sources, the identifications are presented for the first time. It is confirmed that the majority of strong radio/X-ray emitters are radio-loud active galactic nuclei （AGNs）, particularly blazars. Taking advantage of the high spectral quality and resolution and our refined spectral modeling, we are able to disentangle narrow line radio galaxies （NLRGs）, as vaguely termed in most previous identification work, into Seyfert II galaxies and LINERs （low-ionization nuclear emission regions）, based on the standard emission line diagnostics. The NLRGs in the RGB sample, mostly belonging to ＇weak line radio galaxies＇, are found to have optical spectra consistent predominantly with LINERs, and only a small fraction with Seyfert II galaxies. A small number of LINERs have radio power as high as 10623 - 10^26 W Hz^- 1 at 5 GHz, being among the strongest radio emitting LINERs known so far. Two sources are identified with radio-loud narrow line Seyfert 1 galaxies （NLS 1 s）, a class of rare objects. The presence is also confirmed of flat-spectrum radio quasars whose radio-optical-X-ray effective spectral indices are similar to those of High-energy peaked BL Lacs （HBLs）, as suggested by Padovani et al., although it is still a debate as to whether this is the case for their actual spectral energy distributions.

关键词： galaxies active -- galaxies quasars -- BL Lacerate objects general --X-rays general -- radio continuum general

THREE-DIMENSIONAL NUMERICAL SIMULATION OF WAVE SLAMMING ON AN OPEN STRUCTURE

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Journal of Hydrodynamics 2012年第4期24卷 526-534页

作者： DING Zhao-qiang wang guo-yu REN Bing State Key Laboratory of Coastal and Offshore Engineering Dalian University of TechnologyDalian 116024China

The three-dimensional numerical simulation of wave slamming on an open structure in the splash zone is carried out based upon the Volume Of Fluid （VOF） method. A wave basin is established by solving the continuity equation and the Navier-Stoke equations. The linear wave-maker is placed on the left side of the basin, and the numerical sponge layer and the SRC are placed on the right side of the basin to damp the incident waves. The three-dimensional wave slamming boundary condition is adopted to model waves in contact with and separated from the underside of the structure. The numerical results of wave slamming on a foursquare structure for various parametric cases are verified by the experimental results. Meanwhile, the characteristics of the wave impact forces on the undersides of the rectangular structures with various length-breadth ratios are discussed.

关键词： wave slamming three-dimensional Volume Of Fluid (VOF)

Heat transfer characteristics for double-jet in different flow regions on a thick plate

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Journal of Iron and Steel Research International 2021年第11期28卷 1400-1407页

作者： Xiu-hua Tian Tian-liang Fu Zhao-dong wang guo-dong wang State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819LiaoningChina

During multi-jet cooling,the complex hydrodynamic characteristics caused by the interaction between jets will affect the heat transfer of the *** further clarify the heat transfer characteristics in different flow regions,the double-jet cooling experiments were completed on a 50-mm-thick plate with the initial cooling temperature and jet angle in the range of 300–900°C and 0°–60°,*** inverse heat conduction was used to calculate the surface temperature and heat ***,the rewetting phenomenon,maximum heat flux and maximum cooling speed were *** results show that increasing the angle between jet and wall normal would increase the wetting front’s width downstream of the jet *** the jet angle was 60°,the maximum value increased by 37.29 mm compared with that when the angle was *** correlation between the width of the wetting front and the radial temperature gradient was further *** addition,it was found that the maximum heat flux would be affected by the duration of transition boiling,but not affected by complete wetting *** results clarified the heat transfer mechanisms under various initial cooling temperature and inclination angle conditions on plate cooling in different flow regions,and provided valuable data for controlling heat transfer efficiency and improving cooling uniformity.

关键词： Double-jet Thick plate Rewetting phenomenon Flow region Heat flux

Hot Strip Laminar Cooling Control Model

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Journal of Iron and Steel Research International 2004年第5期11卷 13-17页

作者： wang Jun wang guo-dong LIU Xiang-hua Northeastern University

The hydraulic automatic gauge control system using gap loop for cold mill was designed. The stiffness of HCW cold mill was defined for gap loop, and the dynamic model of gauge control system for gap loop was built wit... 详细信息

关键词： HCW cold mill gap loop control stand modulus

Formal Photograph Compression Algorithm Based on Object Segmentation

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International Journal of Automation and computing 2008年第3期5卷 276-283页

作者： Li Zhu guo-You wang Chen wang Laboratory. for Biomedical Image Processing Institute for Pattern Recognition ＆ Artificial Intelligence Huazhong University of Science ＆ Technology Wuhan 430074 PRC School of Mechanical and Aeropace Engineering Nanyang Technological Vnlversity Sigapore 639798 Sigapore

Small storage space for photographs in formal documents is increasingly necessary in today＇s needs for huge amounts of data communication and storage. Traditional compression algorithms do not sufficiently utilize the distinctness of formal photographs. That is, the object is an image of the human head, and the background is in unicolor. Therefore, the compression is of low efficiency and the image after compression is still space-consuming. This paper presents an image compression algorithm based on object segmentation for practical high-efficiency applications. To achieve high coding efficiency, shape-adaptive discrete wavelet transforms are used to transformation arbitrarily shaped objects. The areas of the human head and its background are compressed separately to reduce the coding redundancy of the background. Two methods, lossless image contour coding based on differential chain, and modified set partitioning in hierarchical trees （SPIHT） algorithm of arbitrary shape, are discussed in detail. The results of experiments show that when bit per pixel （bpp）is equal to 0.078, peak signal-to-noise ratio （PSNR） of reconstructed photograph will exceed the standard of SPIHT by nearly 4dB.

关键词： Image compression object segmentation lossless image contour coding differential chain set partitioning in hierarchical trees (SPIHT) coding of arbitrarily shaped object.

High-frequency magnetic properties and core loss of carbonyl iron composites with easy plane-like structures

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Chinese Physics B 2021年第2期30卷 508-513页

作者： guo-Wu wang Chun-Sheng guo Liang Qiao Tao wang Fa-Shen Li Key Laboratory for Magnetism and Magnetic Materials of MOE Lanzhou UniversityLanzhou 730000China Guangzhou Newlife Magnet Electricity Co. Ltd.Guangzhou 511356China Key Laboratory of Special Function Materials and Structure Design(Ministry of Education) Lanzhou UniversityLanzhou 730000China

To fully release the potential of wide bandgap(WBG)semiconductors and achieve high energy density and efficiency,a carbonyl iron soft magnetic composite(SMC)with an easy plane-like structure is *** to this structure,the permeability of the composite increases by 3 times(from 7.5 to 21.5)at 100 MHz compared with to the spherical carbonyl iron SMC,and the permeability changes little at frequencies below 100 *** addition,the natural resonance frequency of the composite shifts to higher frequencies at 1.7 *** total core losses of the composites at 10,20,and 30 m T are80.0,355.3,and 810.7 m W/cm^(3),respectively,at 500 k *** with the spherical carbonyl iron SMC,the core loss at500 k Hz is reduced by more than 60%.Therefore,this kind of soft magnetic composite with an easy plane-like structure is a good candidate for unlocking the potential of WBG semiconductors and developing the next-generation power electronics.

关键词： soft magnetic composite high frequency magnetic property power electronic core loss

Hierarchical porous NiO as a noble-metal-free cocatalyst for enhanced photocatalytic H_(2) production of nitrogen-deficient g-C_(3)N_(4)

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Rare Metals 2022年第2期41卷 396-405页

作者： Yu-Wei Liao Jing Yang guo-Hong wang Juan wang Kai wang Su-Ding Yan College of Chemistry and Chemical Engineering Hubei Normal UniversityHuangshi 435002China Hubei Key Laboratory of Pollutant Analysis and Reuse Technology Hubei Normal UniversityHuangshi 435002China

Graphitic carbon nitride with nitrogen vacancies(NV-g-C_(3)N_(4))as a photocatalyst has been studied in solardriven energy ***,expensive and rare noble metal co-catalysts such as Pt or Pd are required in the photocatalytic H_(2)***,the exploration of low-cost and high-performance co-catalysts to replace expensive and rare noble metals has received more and more ***,a novel hierarchical porous NiO anchored on NV-g-C_(3)N_(4)is successfully *** NV-g-C_(3)N_(4)/NiO photocatalysts exhibited outstanding H_(2)evolution rate under visible light irradiation in absence of noble metal *** optimized NV-g-C_(3)N_(4)/NiO(the mass ratio of NiO is*1.7%)achieved a maximum H2 evolution rate of 170.60 lmol·g^(-1)·h^(-1),exhibiting*8.3-fold enhancement as compared to that of *** as co-catalyst provided more active sites for photocatalytic H2 ***,on the interface of NV-g-C_(3)N_(4)/NiO,an interface electric field is formed between NiO and host nitrogen-vacated g-C3N4,facilitating the transfer of the photogenerated electrons from NV-g-C_(3)N_(4)to NiO co-catalyst,resulting in significantly promoted migration and separation efficiency of the photogenerated charge carriers.

关键词： Graphitic carbon nitride Hierarchical porous NiO Photocatalysis H_(2)evolution