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Evolution of Through-Thickness Texture in Ultra Purified 17%Cr Ferritic Stainless Steels

Journal of Iron and Steel Research International 2013年第4期20卷 31-38页

作者： GAO Fei liu Zhen-yu liu hai-tao WANG Guo-dong State Key Laboratory of Rolling and Automation Northeastern University

Texture inhomogeneity usually takes place in ferritic stainless steels due to the lack of phase transformation and recrystallization during hot strip rolling,which can deteriorate the formability of final *** order to work out the way of weakening texture inhomogeneity,conventional hot rolling and warm rolling processes have been carried out with an ultra purified ferritic stainless *** results showed that the evolution of through-thickness texture is closely dependent on rolling process,especially for the texture in the center *** both conventional and warm rolling processes,shear texture components were formed in the surface layers after hot rolling and annealing;sharp α-fiber and weakγ-fiber with the major component at{111}〈110〉 were developed in both cold rolled sheet surfaces,leading to the formation of inhomogeneousγ-fiber dominated by{111}〈112〉after recrystallization *** the center layer of conventional rolled and annealed bands,strongα-fiber and weakγ-fiber textures were formed;the cold rolled textures were comprised of sharpα-fiber and weakγ-fiber with the major component at{111}〈110〉,and inhomogeneousγ-fiber dominated by{111}〈112〉 was formed after recrystallization *** contrast,in the centre layer of warm rolled bands,the texture was comprised of weakα-fiber and sharpγ-fiber,andγ-fiber became the only component after *** cold rolled texture displayed a sharpγ-fiber with the major component at{111}〈112〉and the intensity ofγ-fiber close to that ofα-fiber,resulting in the formation of a nearly homogeneousγ-fiber recrystallization texture in the center layer of the final sheet.

关键词： ultra purified ferritic stainless steel rolling process texture recrystallization

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Soil profile characteristics of high-productivity alluvial cambisols in the North China Plain

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Journal of Integrative Agriculture 2015年第4期14卷 765-773页

作者： liu hai-tao LI Bao-guo REN Tu-sheng College of Resources and Environmental Sciences China Agricultural University

The North China Plain（NCP） is one of major breadbaskets in China. Crop growth and grain yield differ significantly with spatial variations of soil properties. This study aims to identify the key soil properties in relation to the grain yield for the winter wheat（Triticum aestivum L.）-maize（Zea mays L.） cropping system in a high-productivity farmland of the NCP. The field trials were conducted in three fields with different grain yield levels in Tai＇an City, Shandong Province, China, during the 2009–2012 period. Consistent field management strategies were applied in the three fields. Fifty-one physical and chemical indicators of the soil profile as related to grain yield were evaluated. An approximate maximum of 17.8% annual average grain yield difference was observed in the fields during the period of 2009–2012. The soil indicators were classified into three clusters with specific functions using cluster analysis, and three key indicators were extracted from each cluster to characterize the different soil properties of three fields. The first cluster represented soil water retention capacity, and the key indicator was available soil water（ASW）, which ranged from 153 to 187 mm in the 1.2 m profile and was correlated positively with grain yield. The second cluster represented soil water conductivity, as measured by saturated hydraulic conductivity（K s）. The higher yield field had a greater capacity to retain topsoil water for its lower K s（1.9 cm d^–1） in the 30–70 cm soil layer as compared to the lower yield field. The third cluster represented nutrient storage and supply, as indicated by the ratio of nutrient content to silt＋clay content of the top soil layer. The ratio of soil organic matter（OM）, total nitrogen（TN）, available P, exchangeable K＋ to silt＋clay content in the 0–20 cm soil layer were 19.0 g kg^–1, 1.6 g kg^–1, 94.7 mg kg^–1, 174.3 mg kg^–1 in the higher yield field, respectively, and correlated positively with the grain yield. By characterizing the diff

关键词： soil quality assessment cluster analysis grain yield key soil indicators

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Energy-efficient collaborative target tracking algorithm using cost-reference particle filtering in wireless acoustic sensor networks

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The Journal of China Universities of Posts and Telecommunications 2009年第1期16卷 9-15,43页

作者： YU Zhi-jun WEI Jian-ming liu hai-tao Wireless Sensor Network Research and Development Center Shanghai Institute of Microsystem and Information Technology Shanghai 200050 China

Target tracking is one of the most important applications of wireless sensor networks. Optimized computation and energy dissipation are critical requirements to save the limited resource of sensor nodes. A new robust and energy-efficient collaborative target tracking framework is proposed in this article. After a target is detected, only one active cluster is responsible for the tracking task at each time step. The tracking algorithm is distributed by passing the sensing and computation operations from one cluster to another. An event-driven cluster reforming scheme is also proposed for balancing energy consumption among nodes. Observations from three cluster members are chosen and a new class of particle filter termed cost-reference particle filter （CRPF） is introduced to estimate the target motion at the cluster head. This CRPF method is quite robust for wireless sensor network tracking applications because it drops the strong assumptions of knowing the probability distributions of the system process and observation noises. In simulation experiments, the performance of the proposed collaborative target tracking algorithm is evaluated by the metrics of tracking precision and network energy consumption.

关键词： target tracking cost-reference particle filtering energy-efficient wireless sensor networks (WSNs)

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Performance Analysis of Anti-Interference Wireless Packet Networks for LEO Micro-Satellite with Adaptive Nulling Antenna Array

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The Journal of China Universities of Posts and Telecommunications 2006年第2期13卷 10-14页

作者： liu hai-tao HAN Fang-jing WAN Jian-wei School DSP Group of National University of Defense Technology Changsha 410073 P.R. China

Information integrity is key to successful operations in intricacy environments in the future, especially when strong interferences exist. This paper presents the design of a novel wireless packet network receiver system for Low Earth Orbit （LEO） micro-satellites with adaptive nulling antenna arrays. It uses three types of interference suppression in cascade： namely spread spectrum, adaptive array nulling, and transform domain filtering. This paper proposes a pilot channel-aided method in order to make full advantage of this arrangement, and analyzes its throughput and delay performance using the Markov chain model. Our results show that this method can achieve excellent delay and throughput performance： When the number of array antenna is 8, its throughput increase relative to the standard Slot-ALOHA protocol is 125 96.

关键词： LEO adaptive array ALOHA packet radio networks

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Dynamics of tether-tugging reorbiting with net capture

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Science China(Technological Sciences) 2014年第12期57卷 2407-2417页

作者： liu hai tao ZHANG Qing Bin YANG Le Ping ZHU Yan Wei ZHANG Yuan Wen College of Aerospace Science and Engineering National University of Defense Technology

To control the growth of space debris in the geostationary earth orbit （GEO）, a novel solution of net capture and tether-tugging reorbiting is proposed. After capture, the tug （i.e., active spacecraft）, tether, net, and target （i.e., GEO debris） constitute a rig- id-flexible coupled tethered combination system （TCS）, and subsequently the system is transported to the graveyard orbit by a thruster equipped on the tug. This paper attempts to study the dynamics of tether-tugging leorbiting after net capture. The net is equivalent to four flexible bridles, and the tug and target are viewed as rigid bodies. A sophisticated mathematical model is developed, taking into account the system orbital motion, relative motion of two spacecraft and spacecraft attitude motion. Given the complexity of the model, the numerical method is adopted to study the system dynamics characteristics. Particular attention is given to the investigation of the possible risks such as tether slack, spacecraft collision, tether rupture, tether-tug intertwist and destabilizing of the rug＇s attitude. The influence of the initial conditions and the magnitudes of the thrust are studied.

关键词： active debris removal net capture tether-tugging reorbiting thruster risk analysis

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Catalytic Synthesis of Methylene Diphenyl Dicarbamate in AcOH/H_2O Mixed Solvent

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Chemical Research in Chinese Universities 2010年第4期26卷 550-553页

作者： PEI Yi-xia LI Hui-quan liu hai-tao ZHANG Qin-hua ZHANG Yi Key Laboratory of Green Process and Engineering Institute of Process Engineering Chinese Academy of Sciences Beijing 100190 P. R. China Graduate University of Chinese Academy of Sciences Beijing 100049 P. R. China

In a mixed solvent of acetic acid（AcOH）/water, methylene diphenyl dicarbamate（MDC） was synthesized by the condensation of methyl phenyl carbamate（MPC） and formaldehyde in the presence of an inorganic acid catalyst. Based on the different solubilities to MPC and MDC, the mixed solvent showed higher catalytic performance than pure water. The mixed solvent not only promoted the condensation of MPC but aslo exhibited the advantage of the product separation with the reactants. Under the optimized conditions： a H2SO4 mass fraction of 31%, a reaction temperature of 95 ℃ and reaction time of 3.5 h, the yield of MDC reached 74.3%. In addition, the recycle of the solvent was also investigated.

关键词： Mixed solvent Methylene diphenyl dicarbamate Formaldehyde Liquid acid

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Change in ^(14)C-soluble Sugar Involved in the Photosynthate Translocation Pathway of Tomato

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Agricultural Sciences in China 2006年第3期5卷 209-215页

作者： QI Hong-yan LI Tian-lai liu hai-tao ZHANG Jie Key Laboratory of Protected Horticulture of Liaoning Province Horticultural College Shenyang Agricultural University Shenyang 110161 P.R.China

Liaoyuanduoli tomato was planted in pots in a solar greenhouse. The first leaf below the second cluster was labeled by ^14CO2 with a dose of 0.555 MBq 30 days after the second cluster anthesis. Mesophyll, midrib, petiole vascular of the fed leaf, internode vascular below the fed leaf （adjacent to the fed leaf）, peduncle vascular of the second cluster, sepal, fruit pedicle, pulp, pectinic, and dissepiment were taken 2, 4, 8, 12, 20, 24, 48, and 72 h, respectively, after ^14CO2 feed to determinate the composition and specific activity of carbohydrate at different sites and different time after the labeling. The results indicated that almost all of the photosynthates resulting from 1 h of photosynthesis could be transported out of the leaf within 72 h and more than 85% of them were exported within 24 h. The greatest amount of sucrose transport occurred in the internode pedicel vascular bundle 8 h after the start of photosynthesis. Assimilates entering the fruit through the internode and pedicel vascular bundles were detectable but in small quantities 2 h after photosynthesis. Only the radio activity of sucrose but not that of glucose and fructose was detected, suggesting that some of the sucrose in the fruit came directly through the phloem at an early stage of fruit development, not through the synthesis of glucose and fructose. Fruit vascular may be the part where sucrose first metabolized after it entered the fruit.

关键词： tomato (L. esculentum Mill.), ^14C-Soluble sugar translocation time metabolism part

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L-Cysteine-assisted Synthesis of Copper Gallium Sulfide Microspheres

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Chemical Research in Chinese Universities 2012年第3期28卷 395-398页

作者： LIANG Xiao-juan ZHONG Jia-song CAI Qian HUANG hai-yu liu hai-tao XIANG Wei-dong SUN Jun-cai College of Chemistry and Materials Engineering Wenzhou UniversityWenzhou 325035P.R.China Institute of Materials and Technology Dalian Maritime UniversityDalian 116026P.R.China College of Materials Science and Engineering Tongji UniversityShanghai 201804P.R.China

An effective L-cysteine-assisted synthetic route has been successfully developed to prepare copper gallium sulfide（CuGaS2） microspheres under solvothermal conditions with CuCI2.2HzO, GaC13 and L-cysteine as source materials, in which L-cysteine was used as the sulfide source and complexing molecule. The experiments revealed that the synthesized sample was of a typical CuGaS2 tetragonal structure. Moreover, the prepared CuGaS2 crystals consisting of microspheres made up of nanoflakes, and the diameter of the nanoflakes was about 20 nm. Raman spectrum of the obtained CuGaS2 exhibits a high-intensity peak of the A1 mode at 306 cm^-1. Meanwhile, a possible growth mechanism was proposed based on the investigations.

关键词： Copper gallium sulfide L-Cysteine Raman spectrum

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Simultaneous Determination of Gold and Platinum by Double Artificial Neural Network Analysis with Flow-injection Chemiluminescence

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Chinese Chemical Letters 2006年第10期17卷 1343-1346页

作者： Ming Yang liu hai tao ZHANG Jun Feng LI Shu Gui CHEN Hong Yan WANG College of chemistry Jilin University Changchun 130012

A highly sensitive double artificial neural network （DANN） analysis with flow-injection chemiluminescence （FI-CL） has been developed to simultaneously determine the trace amounts of the gold and platinum in simula... 详细信息

关键词： Double artificial neural networks flow-injection chemiluminescence simultaneous determination gold and platinum.

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Role of Ga-doping in iron-gallium alloy clusters

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Chinese Physics B 2012年第2期21卷 461-468页

作者： Tang Pei-Zhe liu hai-tao Zhu Jie Wang Shan-Ying Duan Wen-Hui Department of Physics Tsinghua UniversityBeijing 100084China The Key Laboratory of Computational Physics Institute of Applied Physics and Computational MathematicsBeijing 100088China State Key Laboratory for Advanced Metals and Materials University of Science and Technology BeijingBeijing 100083China

The structural and magnetic properties of Fen-mCam （n = 3 - 6, m = 0 - 2; n = 13, m = 0 - 3） alloy clusters have been studied using density functional theory. The substitutional doping is favourable for small clusters with up to six atoms at low Ga concentration and substitutional Ga atoms in 13-atom clusters prefer surface sites. The Ca-doping generally could reduce the energetic stability but enhance the electronic stability of Fe clusters, along with a decrease of the local magnetic moments of Fe atoms around Ca dopants. These findings provide a microscopic insight into Fe-Ga alloys which are well：known magnetostriction materials.

关键词： iron gallium alloy clusters density functional theory stability magnetic properties

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