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A Real-Time Online Structure-Safety Analysis Approach Consistent with Dynamic Construction Schedule of Underground Caverns

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JOURNAL OF CONSTRUCTION engineering AND MANAGEMENT 2016年第9期142卷

作者： Wang, Chao Zhang, Sherong Du, Chengbo Pan, Fei Xue, Lie Tianjin Univ Sch Civil Engn Tianjin 300072 Peoples R China Tianjin Univ State Key Lab Hydraul Engn Simulat & Safety Tianjin 300072 Peoples R China Yalong River Hydropower Dev Co Ltd Chengdu 610051 Peoples R China

Because of the uncertainties present in geology and construction processes, construction projects in underground cavern groups are typically characterized by high degrees of uncertainty. The real-time safety analysis of underground caverns during construction has been a key technological issue because previous three-dimensional simulations have commonly failed to consider the time-varying changes in construction schedules and geological conditions. Thus, this study couples a construction progress simulation with a real-time dynamic analysis of engineering safety. In this study, a real-time online safety analysis approach based on four-dimensional technology during the construction of underground caverns is introduced, and a dynamic visualization management system of safety information in underground caverns during construction is developed using the OpenGL (Open Graphics Library) Tao Framework and C#, with which integrated management of information related to safety, including geological information, construction progress information, monitoring information, and numerical simulation data, is considered. This study also demonstrates that real-time safety evaluation based on a construction safety information model during the construction of underground caverns is feasible and practical, as shown in a real example in China.

关键词： Underground caverns Four-dimensional technology Real-time online analysis Construction schedule Visualization Information technologies

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More Efficient Microwave Argon Plasma Jet With a Symmetric Hairpin Copper Wire at Atmospheric Pressure

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IEEE TRANSACTIONS ON PLASMA SCIENCE 2015年第3期43卷 906-907页

作者： Chen, Zhaoquan Yin, Zhixiang Huang, Yourui Stepanova, Olga Gutsev, Sergey Kudryavtsev, Anatoly A. Anhui Univ Sci & Technol Coll Elect & Informat Engn Huainan 232001 Peoples R China St Petersburg State Univ Informat Technol Mech & St Petersburg 197101 Russia St Petersburg State Univ Fac Phys St Petersburg 199034 Russia

In this paper, 2.45-GHz microwave argon plasma jets at atmospheric gas pressure are generated at the end of quartz tube (with an inner radius of 2 mm). With the applied power of 50 W and the different patterns of exciter, the lengths of plasma jet plume out of the end of quartz tube, about 5, 15, and 25 mm, respectively, are obtained. Moreover, the simulated result suggests that the efficient plasma jet with a symmetric hairpin copper wire is attributed to the enhanced electric field of local surface plasmon polaritons.

关键词： Atmospheric pressure plasma local surface plasmon polaritons (SPPs) microwave argon plasma jet

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Isotropic and anisotropic nanocrystalline NdFeB bulk magnets prepared by binder-free high-velocity compaction technique

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JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS 2015年 390卷 26-30页

作者： Deng, Xiangxing Liu, Zhongwu Yu, Hongya Xiao, Zhiyu Zhang, Guoqing S China Univ Technol Sch Mat Sci & Engn Guangzhou 510640 Guangdong Peoples R China Univ Sci & Technol Beijing State Key Lab Adv Met & Mat Beijing 100083 Peoples R China S China Univ Technol Sch Mech & Automot Engn Guangzhou 510640 Guangdong Peoples R China Beijing Inst Aeronaut Mat Sci & Technol Adv High Temp Struct Mat Lab Beijing 100095 Peoples R China

NdFeB powders were consolidated into nanocrystalline bulk magnets by a near-net-shape process of high-velocity compaction (HVC) at room temperature with no binder employed. The nanostructure can be maintained after compaction. The compacted magnets with relatively high density can inherit the coercivity of the starting powders. The mechanical strength of the HVCed magnet after heat treatment is comparable to that of the conventional bonded NdFeB magnets. The anisotropic magnet has also been prepared by hot deformation using HVCed magnet as the precursor. The remanence value along the pressing direction increased from 0.64 to 0.95 T and maximum energy product (BH)(max) increased from 65 to 120 kJ/m(3) after hot deformation. The processing-structure-properties relationships for both isotropic and anisotropic magnets are discussed. (C) 2015 Elsevier B.V. All rights reserved.

关键词： High-velocity compaction (HVC) NdFeB magnets Nanocrystalline Anisotropic

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Radial Lorentz force augmented deep drawing for large drawing ratio using a novel dual-coil electromagnetic forming system

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JOURNAL OF MATERIALS PROCESSING technology 2015年 222卷 13-20页

作者： Lai, Zhipeng Cao, Quanliang Zhang, Bo Han, Xiaotao Zhou, Zhongyu Xiong, Qi Zhang, Xiao Chen, Qi Li, Liang Huazhong Univ Sci & Technol Wuhan Natl High Magnet Field Ctr Wuhan 430074 Peoples R China Huazhong Univ Sci & Technol State Key Lab Adv Electromagnet Engn & Technol Wuhan 430074 Peoples R China Hubei Elect Power Res Inst State Grid Key Lab High Voltage Field Test Tech Wuhan 430077 Peoples R China

In order to overcome the limitations of the existing electromagnetic forming systems for deep drawing, a dual-coil system has been developed for deep drawing of sheet metal with large drawing ratio. In addition to the conventional driving coil that generates the axial Lorentz force on the workpiece, a radial inward force in the flange region is generated by a second coil that is energized by an individual power supply. The axial force pushes the sheet into the die in axial direction, while the radial Lorentz force enhances the material flow of the flange. The effectiveness of the novel system is validated by a series of experiments for deep drawing a cup of AA1060-H24 with drawing ratio of 3.25. It is demonstrated that with the dual-coil system the material flow of the flange can be significantly enhanced, and the maximum forming depth without failure is greatly increased from 8.44 mm to 20.28 mm. The new electromagnetic forming method is expected to break through the bottleneck of deep drawing and enable major advances in forming metallic parts and components that are difficult to form, by developing driving coils with advanced design. (C) 2015 Elsevier B.V. All rights reserved.

关键词： Dual-coil electromagnetic forming Deep drawing Drawing ratio Draw-in Radial inward force

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Comparison for 100 Gb/s PDM-DD Short Reach Optical Communication System Transmission Performance with PAM4, CAP16 and DMT

Comparison for 100 Gb/s PDM-DD Short Reach Optical Communica...

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2018 Conference on Lasers and Electro-Optics Pacific Rim, CLEO-PR 2018

作者： Huo, Jiahao Zhou, Xian Zhong, Kangping Tu, Jiajing Huangfu, Wei Yuan, Jinhui Long, Keping Yu, Changyuan Tao Lau, Alan Pak Lu, Chao Beijing Engineering and Technology Research Center for Convergence Networks and Ubiquitous Services School of Computer and Communication Engineering University of Science and Technology Beijing Beijing100083 China Department of Electronic and Information Engineering Hong Kong Polytechnic University Hong Kong Department of Electrical Engineering Hong Kong Polytechnic University Hong Kong Macom Technology Solutions Hong Kong

A promising way to significantly meet the demands of short reach systems is polarization division multiplexing with direct detection (PDM-DD). In this paper, we compare three advanced modulation formats performance on... 详细信息

ISBN: (纸本)9781943580453

关键词： Pulse width modulation

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Reliability study of industry Sn3.0Ag0.5Cu/Cu lead-free soldered joints in electronic packaging

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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS 2015年第11期26卷 9164-9170页

作者： Sun, Lei Zhang, Liang Zhong, Su-juan Ma, Jia Bao, Li Jiangsu Normal Univ Sch Mech & Elect Engn Xuzhou 221116 Peoples R China Zhengzhou Res Inst Mech Engn State Key Lab Adv Brazing Filler Met & Technol Zhengzhou 450001 Peoples R China

The wettability of Sn3.0Ag0.5Cu on copper substrate with different reflow temperature was studied. The growth mechanism of intermetallic compound (IMC) and mechanical properties were also investigated under isothermal aging condition at 125, 150 and 175 A degrees C with different aging time. The results showed that, with the reflow temperature increasing, the spreading area of Sn3.0Ag0.5Cu lead-free solder increased. The morphology of IMC formed at Sn3.0Ag0.5Cu/Cu interface was gradually changed from scallop-type to planar-type, and the thickness of IMC was increased with the aging temperature and aging time. Meanwhile, the IMC growth rate increased with aging temperature but decreased with aging time. In addition, the mechanical properties of solder joints with different isothermal aging decreased with increasing aging time. In the initial stage of isothermal aging, the mechanical properties of solder joints decreased rapidly, then the rate of decline became stabilized.

关键词： Lead-free solders

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Stability Diagram of Mg-Al-O System Inclusions in Molten Steel

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METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE 2015年第4期46卷 1809-1825页

作者： Zhang, Lifeng Ren, Ying Duan, Haojian Yang, Wen Sun, Liyuan Univ Sci & Technol Beijing Beijing Key Lab Green Recycling & Extract Met GRE State Key Lab Adv Met Beijing 100083 Peoples R China Univ Sci & Technol Beijing Sch Met & Ecol Engn Beijing 100083 Peoples R China

In the current study, the stability diagrams of Mg-Al-O system in molten steel are calculated using two methods. After comparing the result of connecting iso-oxygen contours of different phases (iso-oxygen contours method) and calculating the border lines of different phases (border lines method), the former method is more accurate and popular. Particularly, the detailed calculation procedures and connection line principles of stability diagram are exhibited. The effects of interaction coefficient, temperature, and activity of oxides on the stability diagram are also discussed. With the currently reported method, stability diagrams of various inclusions in molten steel can be calculated to predict the formation of inclusions.

关键词： System stability

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Enhancement of enzymatic saccharification of corn stover with sequential Fenton pretreatment and dilute NaOH extraction

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BIORESOURCE technology 2015年 193卷 324-330页

作者： He, Yu-Cai Ding, Yun Xue, Yu-Feng Yang, Bin Liu, Feng Wang, Cheng Zhu, Zheng-Zhong Qing, Qing Wu, Hao Zhu, Cheng Tao, Zhi-Cheng Zhang, Dan-Ping Changzhou Univ Coll Pharmaceut Engn & Life Sci Biochem Engn Lab Platform Bioethanol Changzhou Peoples R China Washington State Univ Bioprod Sci & Engn Lab Dept Biol Syst Engn Richland WA 99354 USA Changzhou Univ Coll Pharmaceut Engn & Life Sci Lab Biocatalysis & Bioproc Changzhou Peoples R China

In this study, an effective method by the sequential Fenton pretreatment and dilute NaOH extraction (FT-AE) was chosen for pretreating corn stover. Before dilute NaOH (0.75 wt%) extraction at 90 degrees C for 1 h, Fenton reagent (0.95 g/L of FeSO4 and 29.8 g/L of H2O2) was employed to pretreat CS at a solid/liquid ratio of 1/20 (w/w) at 35 degrees C for 30 min. The changes in the cellulose structural characteristics (porosity, morphology, and crystallinity) of the pretreated solid residue were correlated with the enhancement of enzymatic saccharification. After being enzymatically hydrolyzed for 72 h, the reducing sugars and glucose from the hydrolysis of 60 g/L FT-AE-CS pretreated could be obtained at 40.96 and 23.61 g/L, respectively. Finally, the recovered hydrolyzates containing glucose had no inhibitory effects on the ethanol fermenting microorganism. In conclusion, the sequential Fenton pretreatment and dilute NaOH extraction has high potential application in future. (C) 2015 Elsevier Ltd. All rights reserved.

关键词： Combination pretreatment Corn stover Fenton reagent NaOH extraction Saccharification

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Effect of Superheat, Cooling Rate, and Refractory Composition on the Formation of Non-metallic Inclusions in Non-oriented Electrical Steels

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METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE 2015年第5期46卷 2348-2360页

作者： Luo, Yan Conejo, Alberto Nava Zhang, Lifeng Chen, Lingfeng Cheng, Lin Univ Sci & Technol Beijing Sch Met & Ecol Engn Beijing Key Lab Green Recycling & Extract Met GRE Beijing 100083 Peoples R China Univ Sci & Technol Beijing Sch Met & Ecol Engn Beijing 100083 Peoples R China Qianan Iron & Steel Co Ltd Shougang Grp Qianan 064404 Peoples R China

The magnetic properties of electrical steels are improved with additions of silicon and aluminum;however, these elements also promote the formation of non-metallic inclusions. The presence of non-metallic inclusions in electrical steels severely affects its magnetic properties. In this work, the effect of cooling rate, superheat, and refractory composition on the formation of non-metallic inclusions has been investigated. The evolution in chemical composition has been reported using a new representation employing pseudo-quinary phase diagrams. It has been found that the concentration of MnO in the non-metallic inclusions plays a big role to control its population density. A critical value has been identified above which it is possible to achieve a large decrease in the total number of non-metallic inclusions in electrical steels, in addition to this, it was also possible to define the influence of cooling rate, superheat, and refractory chemical composition on the composition and population density of non-metallic inclusions. It was found that increasing cooling rate and a change of crucible from alumina-based to MgO-based, both increase the population density of NMI, on the contrary, superheat decreases the population density, depending on the concentration of MnO in the inclusions.

关键词： Aluminum oxide

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Distributed evolutionary algorithms and their models: A survey of the state-of-the-art

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APPLIED SOFT COMPUTING 2015年 34卷 286-300页

作者： Gong, Yue-Jiao Chen, Wei-Neng Zhan, Zhi-Hui Zhang, Jun Li, Yun Zhang, Qingfu Li, Jing-Jing Sun Yat Sen Univ Sch Adv Comp Guangzhou 510275 Guangdong Peoples R China Univ Macau Fac Sci & Technol Macau Peoples R China State Key Lab Math Engn & Adv Comp Beijing Peoples R China Univ Glasgow Sch Engn Glasgow G12 8QQ Lanark Scotland Univ Essex Sch Comp Sci & Elect Engn Colchester CO4 3SQ Essex England S China Normal Univ Sch Comp Sci Guangzhou Guangdong Peoples R China

The increasing complexity of real-world optimization problems raises new challenges to evolutionary computation. Responding to these challenges, distributed evolutionary computation has received considerable attention over the past decade. This article provides a comprehensive survey of the state-of-the-art distributed evolutionary algorithms and models, which have been classified into two groups according to their task division mechanism. Population-distributed models are presented with master-slave, island, cellular, hierarchical, and pool architectures, which parallelize an evolution task at population, individual, or operation levels. Dimension-distributed models include coevolution and multi-agent models, which focus on dimension reduction. Insights into the models, such as synchronization, homogeneity, communication, topology, speedup, advantages and disadvantages are also presented and discussed. The study of these models helps guide future development of different and/or improved algorithms. Also highlighted are recent hotspots in this area, including the cloud and MapReduce-based implementations, GPU and CUDA-based implementations, distributed evolutionary multiobjective optimization, and real-world applications. Further, a number of future research directions have been discussed, with a conclusion that the development of distributed evolutionary computation will continue to flourish. (C) 2015 Elsevier B.V. All rights reserved.

关键词： Distributed evolutionary computation Coevolutionary computation Evolutionary algorithms Global optimization Multiobjective optimization

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