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Recent Progress of Neutral Beam Injector and Bearn Emission Diagnosis in LHD

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Plasma Science and Technology 2009年第4期11卷 452-455页

作者： Katsunori IKEDA Kenichi NAGAOKA Yasuhiko TAKEIRI Masaki OSAKABE Katsuyoshi TSUMORI Osamu KANEKO 无 National Institute for Fusion Science LHD Experimental group

Large size hydrogen neutral beam injectors （NBI） used a negative ion source （NNBI） as well as a proton source （PNBI） were developed for the large helical device （LHD）. The injected power from NNBI and PNBI have reached 16 MW and 6.8 MW, respectively, These injected powers have outstripped the nominal beam powers. A diagnostic system of beam-emitted hydrogen visible spectrum has been installed along the beam injection axis to estimate the energy fraction on PNBI. The full energy beam component is about half which is equivalent to 70% of injected beam power. The attenuation of high energy neutral beam is also observed on NNBI. The peak density distribution is effective to increase beam deposition power.

关键词： NBI spectroscopy LHD

Software-Defined Optical Data Centre Networks

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China Communications 2015年第8期12卷 1-9页

作者： PENG Shuping GUO Bingli SHU Yi George Zervas Reza Nejabati Dimitra Simeonidou High Performance Networks group University of Bristol

Based on the analysis of data centre(DC) traffic pattern, we introduced a holistic software-defined optical DC solution. Architecture-on-Demand based hybrid optical switched(OPS/OCS) data centre network(DCN) fabric is introduced, which is able to realise different inter-and intra-cluster configurations and dynamically support diverse traffic in the DC. The optical DCN is controlled and managed by a software-defined networking(SDN) enabled control plane to achieve high programmability. Moreover, virtual data centre(VDC) composition is developed as an application of such softwaredefined optical DC to create VDC slices for different tenants.

关键词： optical data centre (DC) software-defined networking (SDN) virtual data centre(VDC) virtualisation

Synchronization of home departure and arrival times in dual earner households with children:Panel regression model of time gaps

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Journal of Traffic and Transportation Engineering(English Edition) 2019年第5期6卷 504-513页

作者： Bilin Han Harry Timmermans Urban Planning group Eindhoven University of Technology

Organizing schedules and allocating time to different activities is always a challenge in dual-earner households,especially when they have *** may need to link their schedule to those of their children to allow them escorting their children to school or to take care or be with their children at *** paper reports the results of an analysis of the degree of synchronization of home departure and arrival times in dual earner households with children,where the degree of synchronization is defined as the gap between departure and arrival times of a parent and *** activity-travel diary data of different household members,a random parameters regression model is estimated to examine differences in time gaps in home departure and arrival times between parents and children as a function of gender,day of the week,age of the youngest child,and other socio-demographic *** results of the analysis provide insight into factors influencing the degree of synchronization and coordination of double activity-travel scheduling decisions in households with *** indicate that gender,number of children in the household,age of the youngest child,travel within or outside peak hours,day of the week,transport mode used for the work commute and household income level significantly affect time gaps,especially arrival time gaps.

关键词： Home departure and arrival times Synchronization Time gap Dual-earner households Random parameters panel regression model

Influence of Ti on Weld Microstructure and Mechanical Properties in Large Heat Input Welding of High Strength Low Alloy Steels

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Journal of Iron and Steel Research International 2015年第5期22卷 431-437页

作者： A-rong Lin ZHAO Chuan PAN Zhi-ling TIAN China Iron and Steel Research Institute group

The influence of Ti on weld microstructure and mechanical properties in large heat input welding of high strength low alloy steels is investigated. The results indicate that a moderate amount of Ti is still effective for grain refinement even under larger heat input and a large amount of acicular ferrite （AF） is formed in the weld metal when Ti content is within 0. 028%--0. 038%. With increasing Ti content, proeutectoid ferrite in the weld metal decreases, whereas bainite and M-A constituent increase. The type of inclusion in the welds varies from Mn-Si-AI-O to Ti-Mn- A1-O and finally to Ti-A1-O as Ti content increases from 0 up to 0. 064%. As for adding 0. 028%--0. 038% Ti, high weld toughness could be attained since most inclusions less than 2 tim which contain Ti20s provide the effective nu- clei for aeicular ferrite formation. However, the toughness of the weld metals severely reduces when Ti content is over the optimum ranRe of 0. 028%--0. 038%.

关键词： large heat input welding Ti microstructure acicular ferrite inclusion high strength low alloy steel

A SAR Image Segment Method Using Gray Level Reduction Based on Graph in ICA Space

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Chinese Journal of Electronics 2017年第4期26卷 883-888页

作者： JI Jian LYU Xiaojia YAO Yafeng School of Computer Science and Technology Xidian University Netease group

This paper proposes a new SAR image segmentation method based on graph and gray level reduction in Independent component analysis(ICA) space. Firstly,according to the grayscale information of SAR image, effective use of gray level reduction for initial segmentation can group the pixels with same or similar values to the same homogeneous region, which can address the problem of over-segmentation. Secondly, the features of regions are extracted in ICA space, and then the similarity degree can be calculated by Euclidean distance. The initial regions are merged in fully connected graph based on minimum spanning tree in ICA space. The process of region merging is divided into two phases; the first phrase is merging the different regions with the largest similarity degree, the second will focus on updating the fully connected graph for iteration. Finally, experimental and comparative results on synthetic and real SAR images verify the efficiency of the proposed algorithm.

关键词： SAR image segmentation Gray level reduction Independent component analysis(ICA) space Fully connected graph

Effect of Nb Content on the Hot Deformation Behavior of S460ML Steel

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Acta Metallurgica Sinica(English Letters) 2019年第4期32卷 526-534页

作者： Yu-Cheng Zhang Zhen-Sheng Meng Yang Meng Xin-Hua Ju Zhong-Hang Jiang Ze-Jun Ma Research Institute of Technology of Shougang group Co.Ltd.

The hot deformation behavior of S460 ML steel with different Nb contents was investigated by single-pass compression experiment on the Gleeble-1500 thermo-machine simulator at deformation temperatures ranging from 900 to 1200 ℃ and strain rates from 0.1 to 5.0 s^(-1). The critical strain of dynamic recrystallization(DRC) under different conditions was determined by using working hardening rate-strain curves. The relationship between critical strain and peak strain of DRC was discussed. By means of regression analysis method, the hot deformation activation energy of steels and the mathematical model for predicting DRC critical strain were calculated and established, respectively. The results showed that DRC occurred during hot deformation. As the deformation temperature increased and strain rate decreased, the critical strain of DRC decreased. The critical strain(εc) showed linear relationship with peak strain(εp). As Nb content increased,the needed deformation temperature for occurring DRC increased, while the needed strain rate for it decreased. The activation energy for hot deformation of S460 ML steel increased with increasing Nb content.

关键词： Dynamic recrystallization Critical strain Nb content Deformation temperature Strain rate Hot deformation

Parameter analysis of a photonic crystal fiber with raised-core index profile based on effective index method

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Chinese Optics Letters 2006年第8期4卷 442-445页

作者： Faramarz E.Seraji Mahnaz Rashidi Vajieh Khasheie Optical Communication group Iran Telecomm Research Center TehranIran Physics group Guilan University RashtIran

Photonic crystal fibers （PCFs） with a stepped raised-core profile and one layer equally spaced holes in the cladding are analyzed. Using effective index method and considering a raised step refractive index difference between the index of the core and the effective index of the cladding, we improve the characteristic parameters such as numerical aperture and V-parameter, and reduce its bending loss to about one tenth of a conventional PCF. Implementing such a structure in PCFs may be one step forward to achieve low loss PCFs for communication applications.

关键词： PCF Parameter analysis of a photonic crystal fiber with raised-core index profile based on effective index method

Solution of the Schrodinger equation for a particular form of Morse potential using the Laplace transform

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Chinese Physics C 2013年第4期37卷 36-38页

作者： M.Zarezadeh M.K.Tavassoly Atomic and Molecular group Faculty of PhysicsYazd University Photonics Research group Engineering Research CenterYazd University

In this paper, we have solved the Schrdinger equation for a particular kind of Morse potential and find its normalized eigenfunctions and eigenvalues, exactly. Our work is based on the Laplace transform technique wh... 详细信息

关键词： Schrdinger equation Laplace transform Morse potential bound state

Mechanism of Mg2+ dissolution from olivine and serpentine: Implication for bioleaching of high-magnesium nickel sulfide ore at elevated pH

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International Journal of Minerals,Metallurgy and Materials 2019年第9期26卷 1069-1079页

作者： Jian-zhi Sun Jian-kang Wen Bo-wei Chen Biao Wu National Engineering Laboratory of Biohydrometallurgy GRINM Group Corporation Limited

To inhibit the dissolution of Mg^2+ during the bioleaching process of high-magnesium nickel sulfide ore, the effect of major bioleaching factors on the dissolution of Mg^2+ from olivine and serpentine was investigated and kinetics studies were carried out. The results indicated that the dissolution rate-controlling steps are chemical reaction for olivine and internal diffusion for serpentine. The most influential factor on the dissolution of Mg^2+ from olivine and serpentine was temperature, followed by p H and particle size. A novel method of bioleaching at elevated pH was used in the bioleaching of Jinchuan ore. The results showed that elevated pH could significantly reduce the dissolution of Mg^2+ and acid consumption along with slightly influencing the leaching efficiencies of nickel and cobalt. A model was used to explain the leaching behaviors of high-magnesium nickel sulfide ore in different bioleaching systems. The model suggested that olivine will be depleted eventually, whereas serpentine will remain because of the difference in the rate-controlling steps. Bioleaching at elevated pH is a suitable method for treating high-magnesium nickel sulfide ores.

关键词： olivine serpentine high-magnesium nickel sulfide ore bioleaching shrinking core model elevated pH