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Thermodynamic Behavior research Analysis of Twin-roll Casting Lead Alloy Strip Process

Chinese Journal of Mechanical Engineering 2017年第2期30卷 352-362页

作者： Chengcan JIANG Yannian RUI School of Mechanical and Electric Engineering SoochowUniversityJiangsu 215021China

The thermodynamic behavior of twin-roll casting （TRC） lead alloy strip process directly affects the forming of the lead strip, the quality of the lead strip and the production efficiency. However, there is little research on the thermodynamics of lead alloy strip at home and abroad. The TRC lead process is studied in four parameters： the pouring temperature of molten lead, the depth of molten pool, the roll casting speed, and the rolling thickness of continuous casting. Firstly, the thermodynamic model for TRC lead process is built. Secondly, the thermodynamic behavior of the TRC process is simulated with the use of Fluent. Through the thermodynamics research and analysis, the process parameters of cast rolling lead strip can be obtained： the pouring temperature of molten lead： 360-400 ℃, the depth of molten pool： 250-300 mm, the roll casting speed： 2.5-3 m/min, the rolling thickness： 8-9 mm. Based on the above process parameters, the optimal parameters（the pouring temperature of molten lead： 375-390 ℃, the depth of molten pool： 285-300 mm, the roll casting speed： 2.75-3 m/min, the rolling thickness： 8.5-9 mm） can be gained with the use of the orthogonal experiment. Finally, the engineering test of TRC lead alloy strip is carried out and the test proves the thermodynamic model is scientific, necessary and correct. In this paper, a detailed study on the thermodynamic behavior of lead alloy strip is carried out and the process parameters of lead strip forming are obtained through the research, which provide an effective theoretical guide for TRC lead alloy strip process.

关键词： TRC lead alloy strip Thermodynamic model Thermodynamic behavior Theoretical guide

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Design of motion control system of pipeline detection AUV

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Journal of Central South University 2017年第3期24卷 637-646页

作者： JIANG Chun-meng WAN Lei SUN Yu-shan Science and Technology on Underwater Vehicle Laboratory Harbin Engineering University Harbin 150001 China

A great number of pipelines in china are in unsatisfactory condition and faced with problems of corrosion and cracking,but there are very few approaches for underwater pipeline *** detection autonomous underwater vehicle(PDAUV) is hereby designed to solve these problems when working with advanced optical,acoustical and electrical sensors for underwater pipeline *** is a test bed that not only examines the logical rationality of the program,effectiveness of the hardware architecture,accuracy of the software interface protocol as well as the reliability and stability of the control system but also verifies the effectiveness of the control system in tank experiments and sea *** motion control system of PDAUV,including both the hardware and software architectures,is introduced in this *** software module and information flow of the motion control system of PDAUV and a novel neural network-based control(NNC) are also ***,a real-time identification method based on neural network is used to realize system *** tank experiments and sea trials are carried out to verify the feasibility and capability of PDAUV control system to complete underwater pipeline detection task.

关键词： pipeline detection autonomous underwater vehicle （PDAUV） novel neural network-based control motion controlsystem embedded system architecture system identification

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Effects of butanol on high value product production in Schizochytrium limacinum B4D1

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ENZYME AND MICROBIAL techNOLOGY 2017年 102卷 9-15页

作者： Zhang, Ke Chen, Limei Liu, Jianmin Gao, Feng He, Ronglin Chen, Wuxi Guo, Wei Chen, Shulin Li, Demao Chinese Acad Sci Tianjin Inst Ind Biotechnol Tianjin Key Lab Ind BioSyst & Bioproc Engn Tianjin Airport Econ Area 32 West 7th Ave Tianjin 300308 Peoples R China Qianxi Cty Bur Agr & Anim Husb 40 Lixini Ave Tangshan 064300 Peoples R China

Schizochytrium is a microalgae-like fungus and is widely used for producing docosahexaenoic acid (DHA). It is also a promising source of squalene and carotenoids. However, few fermentation strategies are available in enhancing squalene and carotenoid content in Schizochytrium. This study showed that butanol addition had multiple effects on Schizochytrium limacinum B4D1. First, butanol addition altered the lipid content of cells. Second, 6 g/L of butanol decreased the proportion of DHA by nearly 40%. Third, the squalene content increased 31-fold in the presence of 6 g/L butanol. Finally, cells accumulated more carotenoids upon butanol addition. Specifically, when cells were treated with 8 g/L butanol, the astaxanthin content increased to 245 times than that of the untreated control. These results are helpful for the commercial exploitation of Schizochytrium in producing squalene and carotenoids. (C) 2017 Elsevier Inc. All rights reserved.

关键词： Schizochytrium Butanol Squalene Carotenoids Astaxanthin

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Effects of Disulfide Bond Reduction on the Conformation and Trypsin/Chymotrypsin Inhibitor Activity of Soybean Bowman-Birk Inhibitor

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JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2017年第11期65卷 2461-2467页

作者： He, Hui Li, Xingfei Kong, Xiangzhen Zhang, Caimeng Hua, Yufei Chen, Yeming Jiangnan Univ Sch Food Sci & Technol State Key Lab Food Sci & Technol 1800 Lihu Ave Wuxi 214122 Jiangsu Peoples R China

Soybean seeds contain three groups (A, C, and D) of Bowman-Birk inhibitors (BBIs). In this study, highly purified BBI-A (approximately 96%) was obtained from soybean whey at the 0.1 g level by the complex coacervation method. BBI-A has seven disulfide bonds (SS) and no sulfhydryl group and exhibits trypsin inhibitor activity (TIA) and chymotrypsin inhibitor activity (CIA). The X-ray structure has shown that BBI-A has five exposed SS and two buried SS. Because of steric hindrance, it was reasonable to consider that dithiothreitol first attacks the five exposed SS and then the two buried SS, which was supported by the results that SS reduction with dithiothreitol could be divided into quick and slow stages, and the critical point was close to 5/7. The effects of SS reduction on TIA and CIA could be divided into three stages: when one exposed SS was reduced, both TIA and CIA decreased to approximately 60%;with further reduction of exposed SS, CIA gradually decreased to 8% and TIA gradually decreased to 26%;with further reduction of buried SS, CIA gradually decreased to 2% and TIA slightly decreased to 24%. Far-ultraviolet (far-UV) circular dichroism (CD) spectra showed that the secondary structure of BBI-A was slightly changed, whereas near-ultraviolet (near-UV) CD spectra showed that the conformation of BBI-A was substantially changed after the five exposed SS were reduced;further reduction of buried SS affected the conformation to some extent. The results of Tricine sodium dodecyl sulfate polyacrylamide gel electrophoresis and from a C8 column showed the same trend as near-UV CD spectra. BBI-A has a structural peculiarity in that two hydrophobic patches are exposed to the exterior (in contrast to typical soluble proteins), which was attributed to the seven SS by some researchers. These results support the hypothesis that hydrophobic collapse of the exposed hydrophobic patches into a regular hydrophobic core occurred after the reduction of SS in BBI-A.

关键词： Bowman-Birk inhibitor disulfide bond conformational change bioactivity

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Content Placement With Maximum Number of End-to-Content Paths in k-Node (Edge) Content Connected Optical Datacenter Networks

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JOURNAL OF OPTICAL COMMUNICATIONS AND NETWORKING 2017年第1期9卷 53-66页

作者： Li, Xin Yin, Shan Wang, Xinbo Zhou, Yu Zhao, Yongli Huang, Shanguo Zhang, Jie Beijing Univ Posts & Telecommun State Key Lab Informat Photon & Opt Commun Beijing Peoples R China Univ Calif Davis Davis CA 95616 USA

To design survival datacenter networks, the concept of content connectivity, which is defined as the reachability of content from any point of a network after disaster failures, was recently proposed. To quantitatively measure content connectivity, we propose a novel concept of k-node (edge) content connectivity and apply it to optical datacenter networks. Furthermore, a novel disaster-resilient k-node (edge) content connected optical datacenter network (KC-ODN) is proposed in this paper. Design of the KC-ODN is divided into two sub-problems: content placement and independent end-to-content paths calculation. We consider flexible content placement (FCP), in which the content is replicated and maintained in multiple datacenters, rather than fixed content placement (FICP), in which the content is replicated and maintained in only one fixed datacenter, to realize KC-ODN. The integer linear program (ILP) model and heuristic algorithms are developed to achieve KC-ODN. Numerical results show that the method of FCP has lower wavelength consumption than the method of FICP. It is easier to realize high-level k-node (edge) content connectivity in a network with higher connectivity. Compared with the ILP method, heuristic algorithms are more scalable for large-scale optical datacenter networks.

关键词： Content connectivity Independent paths Natural disaster Optical datacenter networks

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Modular handover algorithm for 5G HetNets with comprehensive load index

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The Journal of china Universities of Posts and Telecommunications 2017年第2期24卷 57-65页

作者： Li Danyang Zhang Zhizhong Gao Yiyi Chongqing Key Laboratory of Communication Networks and Testing Technology Chongqing University of Posts and Telecommunications

Most existing handover decision system （HDS） designs are monolithic, resulting in high computational cost and unbalance of overall network. A novel modular handover algorithm with a comprehensive load index for the 5th generation （5G） heterogeneous networks （HetNets） is proposed. In this paper, the handover parameters, serving as the basis for handover, are classified into network＇s quality of service （QoS） module, user preference （UP） module and degree of satisfaction （DS） module according to the new modular HDS design. To optimize switching process, the comprehensive network load index is deduced by using triangle module fusion operator. With respect to the existing handover algorithm, the simulation results indicate that the proposed algorithm can reduce the handover frequency and maintain user satisfaction at a higher level. Meanwhile, due to its block calculation, it can bring about 1.4 s execution time improvement.

关键词： 5G HetNets handover modular HDS comprehensive load index

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QTL analysis of cocoon shell weight identifies BmRPL18 associated with silk protein synthesis in silkworm by pooling sequencing

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SCIENTIFIC REPORTS 2017年第1期7卷 1-9页

作者： Li, Chunlin Tong, Xiaoling Zuo, Weidong Luan, Yue Gao, Rui Han, Minjin Xiong, Gao Gai, Tingting Hu, Hai Dai, Fangyin Lu, Cheng Southwest Univ State Key Lab Silkworm Genome Biol Chongqing 400716 Peoples R China Southwest Univ Coll Biotechnol Agr Minist Key Lab Sericulture Biol & Genet Breeding Chongqing 400716 Peoples R China

Mechanisms that regulate silk protein synthesis provide the basis for silkworm variety breeding and silk gland bioreactor optimization. Here, using the pooling sequencing-based methodology, we deciphered the genetic basis for the varied silk production in different silkworm strains. We identified 8 SNPs, with 6 on chromosome 11 and 1 each on chromosomes 22 and 23, that were linked with silk production. After conducting an association analysis between gene expression pattern, silk gland development and cocoon shell weight (CSW), BMGN011620 was found to be regulating silk production. BMGN011620 encodes the 60S ribosomal protein, L18, which is an indispensable component of the 60S ribosomal subunit;therefore we named it BmRPL18. Moreover, the clustering of linked SNPs on chromosome 11 and the analysis of differentially expressed genes reported in previous Omics studies indicated that the genes regulating silk protein synthesis may exhibit a clustering distribution in the silkworm genome. These results collectively advance our understanding of the regulation of silk production, including the role of ribosomal proteins and the clustered distribution of genes involved in silk protein synthesis.

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Transcription factor E74A affects the ecdysone titer by regulating the expression of the EO gene in the silkworm, Bomby mori

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BIOChiMICA ET BIOPHYSICA ACTA-GENERAL SUBJECTS 2017年第3期1861卷 551-558页

作者： Sun, Wei Wang, Cheng-Fang Zhang, Ze Chongqing Univ Sch Life Sci Lab Evolutionary & Funct Genom Chongqing 401331 Peoples R China

The formation of ecdysone pulse in insects is synergistically controlled by its biosynthesis and degradation. Previous studies have revealed the feedback regulation of the prothoracic gland (PG) activity to affect the hormone synthesis. However, the molecular regulatory mechanism of the ecdysone degradation is still unclear. In this study, we showed that ecdysone oxidase (EO) gene encoding a hormone metabolism enzyme was also induced by hormone itself in the domestic silkworm, Bombyx mori. Furthermore, luciferase reporter, chromatin immuno-precipitation and electrophoretic mobility shift assays showed that ecdysone inducible transcription factor E74A could bind to the cis-regulatory elements of the EO gene. Then, down-regulating the expression of the E74A by RNA interference (RNAi) decreased the expression of the EO gene and caused a higher ecdysone titer compared with the control. Thus, our results demonstrated a new feedback regulation degradation (EO) pathway controlled by ecdysone itself through transcription factor E74A, expanding the knowledge about the regulatory system that determines the formation of ecdysone pulse. (C) 2016 Elsevier B.V. All rights reserved.

关键词： Ecdysone Ecdysone oxidase (EO) Transcription factor E74A RNA interference Silkworm

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Pathfinder: Application-Aware Distributed Path Computation in Clouds

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INTERNATIONAL JOURNAL OF PARALLEL programMING 2017年第6期45卷 1273-1284页

作者： Jin, Hai Abbasi, Aaqif Afzaal Wu, Song Huazhong Univ Sci & Technol Sch Comp Sci & Technol Serv Comp Technol & Syst Lab Cluster & Grid Comp Lab Wuhan 430074 Peoples R China Huazhong Univ Sci & Technol Sch Comp Sci & Technol Cluster & Grid Comp Lab Serv Comp Technol & Syst Lab Wuhan 430074 Peoples R China

Path computation in a network is dependent on the network's processes and resource usage pattern. While distributed traffic control methods improve the scalability of a system, their topology and link state conditions may influence the sub-optimal path computation. Herein, we present Pathfinder, an application-aware distributed path computation model. The proposed model framework can improve path computation functions through software-defined network controls. In the paper, we first analyse the key issues in distributed path computation functions and then present Pathfinder's system architecture, followed by its design principles and orchestration environment. Furthermore, we evaluate our system's performance by comparing it with FreeFlow and Prune-Dijk techniques. Our results demonstrate that Pathfinder outperforms these two techniques and delivers significant improvement in the system's resource utilisation behaviour.

关键词： Cloud computing Virtualization SDN Network Topology inference Path computation

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Angular Superresolution with Antenna Pattern Errors

Angular Superresolution with Antenna Pattern Errors

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IEEE Radar Conference (RadarConf)

作者： Xia, Jie Lu, Xinfei Guan, Jian Chen, Weidong Univ Sci & Technol China Chinese Acad Sci Key Lab Electromagnet Space Informat Dept EEIS Hefei Anhui Peoples R China

ISBN: (纸本)9781467388238

Angular resolution is limited by the antenna beam width for phase array radar (PAR) imaging, which can be alleviated by deconvolution since the azimuth echo can be seen as the convolution of the antenna pattern and target azimuth backscatter coefficients. Nearly all previous works put a special emphasis on deconvolution method to achieve high angular resolution as well as effectively suppress noise under the hypothesis that antenna pattern is known precisely. However, actual impulse response function deviates from the nominal value more or less in practice and this mismatch will degrade the performance of deconvolution algorithm. In this paper, we establish the errors model for antenna pattern and analyze the influences on deconvolution for our application scenarios. A novel deconvolution algorithm taking into account the perturbation due to errors modeling is also proposed, which improves upon the CID algorithm via combining with reweighted l(1) minimization. The performance of the proposed method is demonstrated by the simulation and real experimental data.

关键词： Angular superresolution Antenna pattern errors Deconvolution Errors modeling Reweighted l(1) minimization

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