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7th International Conference on Ambient Systems, Networks and Technologies (ANT) / 6th International Conference on Sustainable Energy Information technology (SEIT)

作者： Chen, Junfeng Hu, Zhaoyang Wang, Shengming Cheng, Yongzhi Liu, Minghai Huazhong Univ Sci & Technol Sch Elect & Elect Engn State Key Lab Adv Electromagnet Engn & Technol Wuhan 430074 Peoples R China Wuhan Univ Sci & Technol Engn Res Ctr Met Automat & Detecting Technol Minist Educ Wuhan 430081 Peoples R China

Magnetically coupled resonant wireless power transfer (WPT) has been employed in many applications, such as wireless charging of portable electronic devices and electric vehicles. This technology can also provide solutions for power transfer in complex environment and special scenario with mid-range transfer distance and acceptable transfer efficiency. In this paper, a mid-range WPT system is designed to provide an effective solution for power supply to smart grid on-line monitoring devices in high voltage (HV) on-site condition. Both the model, design, and experimental implementation of a two-coil system are represented. To find out the transfer characteristic of the proposed mid-range WPT system, the circuit model exciting frequency coupling output power and transfer efficiency are analyzed based on the circuit and magnetic principles. Some key points about the optimal working area for the mid-range WPT system are demonstrated. Finally, a prototype system with transfer distance 1.1 meter for 110 kV HV power cables is built to verify the effectiveness of the regular law of system. By carefully tuning the circuit parameters, the prototype is able to deliver 20W power through 1.1 meter distance with 20.23% efficiency. (C) 2016 The Authors. Published by Elsevier B.V.

关键词： Wireless power transfer (WPT) Mid-range Smart Grid HV power On-line Monitoring Devices

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Accelerated formation and improved performance of CH3NH3PbI3-based perovskite solar cells via solvent coordination and anti-solvent extraction

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JOURNAL OF MATERIALS CHEMISTRY A 2017年第8期5卷 4190-4198页

作者： Zhang, Jitao Zhai, Guangmei Gao, Wenhui Zhang, Caifeng Shao, Zhimeng Mei, Fuhong Zhang, Jianbing Yang, Yongzhen Liu, Xuguang Xu, Bingshe Taiyuan Univ Technol Res Ctr Adv Mat Sci & Technol Key Lab Interface Sci & Engn Adv Mat Minist Educ Taiyuan 030024 Shanxi Peoples R China Univ Elect Sci & Technol China State Key Lab Elect Thin Films & Integrated Devic Chengdu 610054 Sichuan Peoples R China Collaborat Innovat Ctr Adv Thin Film Optoelect Ma Taiyuan 030024 Shanxi Peoples R China Huazhong Univ Sci & Technol Sch Opt & Elect Informat Wuhan 430074 Hubei Peoples R China Taiyuan Univ Technol Coll Chem & Chem Engn Taiyuan 030024 Shanxi Peoples R China

The two-step sequential deposition method is widely used in the preparation of high-performance mesoscopic perovskite solar cells. However, when the conventional sequential deposition method is applied to fabricate bilayered mesostructured and planar-structured devices, inefficient conversion of PbI2 to perovskite has been a big challenge. In this work, we report a new solvent coordination and anti-solvent extraction (SCAE) strategy for preparing porous PbI2 films to rapidly convert all PbI2 into perovskite active layers in bilayered mesostructured perovskite solar cells. It is demonstrated that PbI2 . DMSO (dimethyl sulfoxide, coordinated solvent) intermediate complexes are not only capable of restricting the fast growth of PbI2 grains, but also capable of facilitating the formation and regulation of porous PbI2 structures during the process of anti-solvent (chlorobenzene) extraction. With the porous PbI2 template, its complete conversion time into CH3NH3PbI3 is greatly shortened to less than ten minutes from one hour for the conventional method. The best device fabricated through the SCAE process exhibits a power conversion efficiency of above 15% under AM 1.5G solar illumination of 100 mW cm(-2), appreciably outperforming the device without SCAE treatment, which can be ascribed to its uniform surface morphology and more efficient carrier transfer at the interfaces. The results highlight the tunability of the PbI2 morphology via the SCAE process and its importance to highly efficient perovskite conversion, the final perovskite morphology and device performance in a sequential deposition process.

关键词： Lead compounds

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Rapid in-situ reaction synthesis of novel TiC and carbon nanotubes reinforced titanium matrix composites

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Journal of Materials Science & technology 2017年第10期33卷 1165-1171页

作者： Xianglong Sun Yuanfei Han Sanchen Cao Peikun Qiu Weijie Lu State Key Laboratory of Metal Matrix Composites Shanghai Jiao Tong University Shanghai 200240 China

In-situ TiC and remained multi-walled carbon nanotubes（MWCNTs） reinforced Ti composites were synthesized using vacuum hot-press sintering and hot rolling. The effect of weight fraction of MWCNTs on microstructural evolution and mechanical properties of the Ti composites was investigated. The results indicated that both proportion and particle size of TiC increased in proportion to MWCNTs content, which resulted in different matrix microstructure, and the grains were obviously refined after rolling deformation. The hardness tests indicated that MWCNTs addition could make the composites harden, and 18.4%improvement in hardness was obtained after hot rolling. The significant improvement in both strength and hardness could be attributed to grain refinement, solid solution strengthening of carbon and dispersion strengthening of TiC particles and remained MWCNTs. A good combination of strength and ductility were achieved in Ti–1 wt% MWCNTs composites, which were in accordance with the uniform distribution of smaller-sized TiC particles in Ti matrix.

关键词： Titanium matrix composites CNTs Powder metallurgy Hot-rolling

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Purified Dissipative Solitons With a Rectangle Spectrum From a Hybrid Mode-Locked Fiber Laser

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IEEE PHOTONICS technology LETTERS 2017年第19期29卷 1635-1638页

作者： Li, Xing Wu, Miaomiao Zou, Weiwen Dai, Shixun Ningbo Univ Lab Infrared Mat & Devices Res Inst Adv Technol Ningbo 315211 Zhejiang Peoples R China Shanghai Jiao Tong Univ State Key Lab Adv Opt Commun Syst & Networks Dept Elect Engn Shanghai 200240 Peoples R China

We demonstrate a hybrid mode-locking erbiumdoped fiber laser, which combines saturable absorption and nonlinear polarization evolution. The laser is operated in the large normal dispersion regime, offering rectangle spectrum and purified femtosecond pulses with a repetition rate of 3.05 MHz and an average output power of 50.31 mW. The single-pulse energy is 16.5 nJ and the pulse peak power is 26.1 kW, providing a robust ultrafast fiber laser well suited for frequency comb generations and high-power applications.

关键词： Fiber laser hybrid mode-locking ultrafast rectangle spectrum purified pulse

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Effects of soil heat storage and phase shift correction on energy balance closure of paddy fields

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ATMOSFERA 2017年第1期30卷 39-52页

作者： Liu, Xiaoyin Yang, Shihong Xu, Junzeng Zhang, Jiangang Liu, Jintao Hohai Univ State Key Lab Hydrol Water Resources & Hydrau Nanjing 210098 Jiangsu Peoples R China Kunshan Water Conservancy Engn Qual & Safety Supe Kunshan 215300 Jiangsu Peoples R China

The eddy covariance technique was used to measure the energy fluxes of a paddy field under water-saving irrigation in the South China Plain for the stage of rice growth in 2013. This study analyzed the energy balance components and evaluated the energy balance closure. The study also discussed the response of surface energy balance to the change in soil heat storage between the heat flux plates buried at a specific depth and the surface, and the phase shift correction of energy balance components, by using three different statistical methods, namely ordinary least squares (OLS), energy balance ratio (EBR), and energy balance residual (D). The results showed that the OLS slope increased by an average of 8.8%, and the mean daily EBR increased by 5.0% after considering the change in soil heat storage. The range of half-hourly D over a four-month period decreased from 129 - 260 W m(-2) to 102 - 194 W m(-2), and the absolute value of D decreased by 9.9% on the average. Considering the phase correction the increase in OLS regression coefficients with an average of 11.3% and the decrease in half-hourly D. ranging from -61 to 176 W m(-2), both indicated that phase shift correction improved the surface energy balance closure at the half-hourly scale, specifically in the period from sunrise to noon, but had no use in the daily scale. Thus, the two correction methods arc useful in improving the degree of energy balance closure shown in different temporal scales with proper evaluation index Moreover, further research should be given with more attention for other correction aspects.

关键词： Water-saving irrigation paddy field eddy covariance energy balance soil heat storage phase shift correction

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Integrating a weighted-average method into the random walk framework to generate individual friend recommendations

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Science China(Information Sciences) 2017年第11期60卷 43-64页

作者： Jibing GONG Xiaoxia GAO Hong CHENG Jihui LIU Yanqing SONG Mantang ZHANG Yi ZHAO School of Information Science and Engineering Yanshan University The Key Lab for Computer Virtual Technology and System Integration Yanshan University State Key Lab of Mathematical Engineering and Advanced Computing Department of Systems Engineering and Engineering Management The Chinese University of Hong Kong

Friend recommendation is a fundamental service in both social networks and practical applications,and is influenced by user behaviors such as interactions, interests, and activities. In this study, we first conduct in-depth investigations on factors that affect recommendation results. Next, we design Friend++, a hybrid multi-individual recommendation model that integrates a weighted average method(WAM) into the random walk(RW) framework by seamlessly employing social ties, behavior context, and personal information. In Friend++, the first plus signifies recommending a new friend through network features, while the second plus stands for using node features. To verify our method, we conduct experiments on three social datasets crawled from the Sina microblog system(Weibo). Experimental results show that the proposed method significantly outperforms six baseline methods in terms of recall, precision, F1-measure, and MAP. As a final step, we describe a case study that demonstrates the scalability and universality of our method. Through discussion, we reach a meaningful conclusion: although common interests are more important than user activities in making recommendations, user interactions may be the most important factor in finding the most appropriate potential friends.

关键词： multi-individual friend recommendation architecture behavior context analysis Intimacy degree random walk framework social networks

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Comparison of Langmuir and Freundlich adsorption equations within the SWAT-K model for assessing potassium environmental losses at basin scale

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AGRICULTURAL WATER MANAGEMENT 2017年第PartB期180卷 205-211页

作者： Wang, Chunying Boithias, Laurie Ning, Zigong Han, Yuping Sauvage, Sabine Sanchez-Perez, Jose-Miguel Kuramochi, Kanta Hatano, Ryusuke North China Univ Water Resources & Elect Power Zhengzhou 450045 Peoples R China Tsinghua Univ State Key Lab Hydrosci & Engn Beijing 100084 Peoples R China Univ Toulouse Geosci Environm Toulouse CNRS CNES IRD UPS F-31400 Toulouse France Hokkaido Univ Grad Sch Agr Sapporo Hokkaido 0600808 Japan Univ Toulouse CNRS INPT UPS ECOLAB F-31400 Toulouse France

Potassium (K) is an important nutrient for agricultural crop growth. Adsorption of K in soil involves fertilizer optima for enhancing crop productivity and efficient nutrient management. Adsorption is often necessary to predict K transport and losses, such as solid/liquid distribution in soil, plant uptake, and transportation with water and suspended sediments. Based on the Soil and Water Assessment Tool (SWAT), the SWAT-K model has been developed to quantify daily K losses and budget at watershed scale. In this study, Langmuir and Freundlich adsorption equations were both applied and compared in the SWAT-K model to predict K adsorption in the soil and K losses in the volcanic Shibetsu River Watershed (672 km(2), Hokkaido, Japan). Both the Langmuir and Freundlich adsorption equations well fitted the solid/liquid distribution of K in soil. The Freundlich and Langmuir equations showed similar performances to fit the measured data of K sorbed to soil (R-2 = 0.91 for both cases) and Freundlich equation showed slightly better performances of dissolved K load in stream than Langmuir equation (Nash-Sutcliffe efficiency coefficient (E-NS) = 0.66 and 0.60, respectively). Overall, Langmuir and Freundlich equations predicted similar K budgets, including soil K surplus with a difference of 1.2%. The uncertainty related to the choice of the adsorption equation is negligible. Hence, both Langmuir and Freundlich adsorption equations are recommended to predict the K adsorption in soil and in-stream K load when using the SWAT-K model in watershed similar to the study case. Their applicability deserve to be tested in other agricultural watersheds characterized by different soils. (C) 2016 Elsevier B.V. All rights reserved.

关键词： Potassium adsorption Langmuir equation Freundlich equation Potassium losses SWAT-K model

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Overview of Compressed Air Energy Storage and technology Development

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ENERGIES 2017年第7期10卷 991-991页

作者： Wang, Jidai Lu, Kunpeng Ma, Lan Wang, Jihong Dooner, Mark Miao, Shihong Li, Jian Wang, Dan Shandong Univ Sci & Technol Coll Mech & Elect Engn Qingdao 266590 Peoples R China Univ Warwick Sch Engn Coventry CV4 7AL W Midlands England Huazhong Univ Sci & Technol Sch Elect & Elect Engn State Key Lab Adv Electromagnet Engn & Technol Wuhan 430074 Hubei Peoples R China

With the increase of power generation from renewable energy sources and due to their intermittent nature, the power grid is facing the great challenge in maintaining the power network stability and reliability. To address the challenge, one of the options is to detach the power generation from consumption via energy storage. The intention of this paper is to give an overview of the current technology developments in compressed air energy storage (CAES) and the future direction of the technology development in this area. Compared with other energy storage technologies, CAES is proven to be a clean and sustainable type of energy storage with the unique features of high capacity and long-duration of the storage. Its scale and cost are similar to pumped hydroelectric storage (PHS), thus CAES has attracted much attention in recent years while further development for PHS is restricted by the availability of suitable geological locations. The paper presents the state-of-the-art of current CAES technology development, analyses the major technological barriers/weaknesses and proposes suggestions for future technology development. This paper should provide a useful reference for CAES technology research and development strategy.

关键词： compressed air energy storage (CAES) renewable energy energy storage

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Study on microstructure and properties of Sn-0.3Ag-0.7Cu solder bearing Nd

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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS 2016年第8期27卷 8771-8777页

作者： Xu, Jiachen Xue, Songbai Xue, Peng Long, Wei-min Zhang, Qing-ke Nanjing Univ Aeronaut & Astronaut Coll Mat Sci & Technol Nanjing 210016 Jiangsu Peoples R China Nanjing Univ Sci & Technol Sch Mat Sci & Engn Nanjing 210094 Jiangsu Peoples R China Zhengzhou Res Inst Mech Engn Zhengzhou 450001 Peoples R China

The properties and microstructure of Sn-0.3Ag-0.7Cu solder bearing trace amount of rare earth Nd were investigated in this paper. It was found that adding appropriate Nd can improve the properties of solder, the wettability of Sn-0.3Ag-0.7Cu-xNd solder was greatly improved and the mechanical properties were significantly enhanced when the addition of Nd reached 0.1 wt%. It was also found that the microstructure of solder was refined with the increasing content of Nd up to 0.1 wt%. In addition, when the Nd content exceeded 0.25 % a Sn-Nd phase appeared in the solder matrix. Comparing all the results, the comprehensive properties of Sn-0.3Ag-0.7Cu-0.1Nd solder were close to that of the traditional Sn-3.8Ag-0.7Cu solder, even though the content of Ag has been significantly reduced from 3.8 to 0.3 wt%, which had shown a great application prospect to satisfy the increasing requirements of low cost and high performance in the electronics industry.

关键词： Trace amounts Soldering alloys electronics industry Neodymium Microstructure

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Estimating the Molecular Gas Mass of Low-redshift Galaxies from a Combination of Mid-infrared Luminosity and Optical Properties

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ASTROPHYSICAL JOURNAL 2019年第2期887卷 1-1页

作者： Gao, Yang Xiao, Ting Li, Cheng Jiang, Xue-Jian Tan, Qing-Hua Gao, Yu Wilson, Christine D. Bureau, Martin Saintonge, Amelie Sanchez-Gallego, Jose R. Brown, Toby Clark, Christopher J. R. Hwang, Ho Seong Lamperti, Isabella Lin, Lin Liu, Lijie Lu, Dengrong Pan, Hsi-An Sun, Jixian Williams, Thomas G. Chinese Acad Sci Shanghai Astron Observ Shanghai 200030 Shanghai Peoples R China Univ Chinese Acad Sci 19A Yuquan Rd Beijing 100049 Peoples R China Zhejiang Univ Dept Phys Hangzhou 310027 Zhejiang Peoples R China Tsinghua Univ Dept Astron Beijing 100084 Peoples R China Chinese Acad Sci Purple Mt Observ Nanjing 210034 Peoples R China Chinese Acad Sci Key Lab Radio Astron Nanjing 210034 Peoples R China McMaster Univ Dept Phys & Astron Hamilton ON L8S 4M1 Canada Univ Oxford Subdept Astrophys Denys Wilkinson BldgKeble Rd Oxford OX1 3RH England Yonsei Univ Yonsei Frontier Lab 50 Yonsei Ro Seoul 03722 South Korea Yonsei Univ Dept Astron 50 Yonsei Ro Seoul 03722 South Korea UCL Dept Phys & Astron Gower St London WC1E 6BT England Univ Washington Dept Astron Box 351580 Seattle WA 98195 USA Space Telescope Sci Inst 3700 San Martin Dr Baltimore MD 21218 USA Korea Astron & Space Sci Inst 776 Daedeokdae Ro Daejeon 34055 South Korea Acad Sinica Inst Astron & Astrophys AS NTU Astron Math Bldg1Sect 4Roosevelt Rd Taipei 10617 Taiwan Cardiff Univ Sch Phys & Astron Queens Bldg Cardiff CF24 3AA S Glam Wales

We present CO (J = 1-0) and/or CO (J = 2-1) spectroscopy for 31 galaxies selected from the ongoing Mapping Nearby Galaxies at Apache Point Observatory (MaNGA) survey, obtained with multiple telescopes. This sample is combined with CO observations from the literature to study the correlation of the CO luminosities (LCO(1-0)) with the mid-infrared luminosities at 12 (L-12 mu m) and 22 mu m (L-22 mu m), as well as the dependence of the residuals on a variety of galaxy properties. The correlation with L12 mm is tighter and more linear, but galaxies with relatively low stellar masses (M* less than or similar to 10(10) M-circle dot) and blue colors (g - r less than or similar to 0.5 and/or NUV - r less than or similar to 3) fall significantly below the mean LCO(1-0)-L-12 mu m relation. We propose a new estimator of the CO (1-0) luminosity (and thus the total molecular gas mass M-mol) that is a linear combination of three parameters: L-12 mu m, M*, and g - r. We show that, with a scatter of only 0.18 dex in log (LCO(1-0)), this estimator provides unbiased estimates for galaxies of different properties and types. An immediate application of this estimator to a compiled sample of galaxies with only CO (J.=. 2-1) observations yields a distribution of the CO (J.=.2-1) to CO (J.=.1-0) luminosity ratios (R21) that agrees well with the distribution of real observations, in terms of both the median and the shape. Application of our estimator to the current MaNGA sample reveals a gas-poor population of galaxies that are predominantly early-type and show no correlation between molecular gas-to-stellar mass ratio and star formation rate, in contrast to gas-rich galaxies. We also provide alternative estimators with similar scatters, based on r- and/or z-band luminosities instead of M*. These estimators serve as cheap and convenient M-mol proxies to be potentially applied to large samples of galaxies, thus allowing statistical studies of gas-related processes of galaxies.

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