关键词：
enhanced;extraordinary optical transmission;figure of merit;sensitivity;tapered nanohole arrays
摘要：
The phenomenon of extraordinary optical transmission (EOT) caused by light through metallic nanohole arrays has attracted significant attention due to its potential applications for monolithic color filters and ultrasensitive label-free biosensing. However, the EOT spectra of these nanohole arrays have multiple resonance peaks that are spectrally close to each other due to the multiple resonance modes generated by different media on the upper and lower surfaces of metal. In addition, owing to the absorption loss of metal and the scattering of holes, the EOT resonance peaks have low transmission coefficient for practical applications. In this work, utilizing a tapered nanohole arrays structure which is stacked by multiple cylindrical holes with the same depth but different radii, we show that tapered nanohole arrays can effectively suppress the excitation of multiple resonance peaks, and a single EOT peak emerges in the transmission spectrum and simultaneously exhibits significantly enhanced transmission ( approximately 7 times) and narrow linewidth ( approximately 15 nm). The enhanced EOT of tapered nanohole arrays can be also found in other wavelength regions and plasmonic materials. Benefiting from isolated transmission peak, high transmission efficiency and extremely narrow linewidth, a highly sensitive plasmonic nanosensor with sensitivity of 1580 nm/RIU and figure of merit of 105 can be attained. We believe that the tapered nanohole structure would enable applications for ultrasensitive sensors, switches and efficient filters.
摘要：
This paper presents the development of wearable sensing system that can be used to study the gait dynamics of human. A tester wearing sensing shoes participates in this study. Human gait information about standing, jumping and walking is obtained as prior probability based on the train movement model setup theory. For feature extraction of gait, five kinds of features are extracted from foot pressure signals, which are subsequently used for motion analysis. We employ support vector machine and fractal analysis for gait recognition and test the identification performance. Testing outcomes indicate an overall accuracy of 93.57% via radial basis function kernel function. These results demonstrate considerable potential in gait identification.
摘要：
Unstructured online reviews are undergoing a rather rapid expansion with the development of E-commerce, and they contain sentiment information in which consumers and businesses are very interested. Therefore, effective sentiment classification has become one of the important research topics. Many studies have shown that ensemble learning methods may have great hopeful applicability in sentiment classification tasks. In this paper, we propose a new ensemble learning framework for sentiment classification of Chinese online reviews. First of all, according to the complicated characteristics of Chinese online reviews, we extract Part of Speech Combination Pattern, Frequent Word Sequence Pattern and Order Preserved Submatrix Pattern as the input features. Furthermore, we use the algorithm of Random Subspace based on Information Gain by considering the problem of massive features in the reviews, which can improve the base classifiers simultaneously. Finally, we adopt the algorithm of Constructing Base Classifiers based on Product Attributes to combine the sentiment information of each attribute in a review so as to obtain better performance on sentiment classification. The experimental results show that the proposed ensemble learning framework has significant improvement in sentiment classification of Chinese online reviews.
摘要：
Community discovery algorithms are important aspects of network science, especially as social network structures become more complex. Multi-mode social networks have recently become a challenging and popular topic in this field. At present, inner-mode relationship is mainly considered in community discovery algorithms for social networks. Thus, the effect of the these methods is not well in clustering as the intra-mode relationship is not considered in the clustering methods. In this paper, we propose a flexible and robust clustering framework, MRTA (the Multi-Similarity Regular Tri-Factorization Algorithm), based on non-negative tri-matrix factorization. MRTA has several advantages over the existing methods. First, it achieves more consistent clustering results based on cluster indicator of inner-mode and intra-mode relationships of multi-mode networks. Second, it can simultaneously cluster multiple modes, which is impossible for single-mode clustering algorithms. Finally, it provides a multi-mode clustering solution that is more robust to noise. We perform an efficient iterative update algorithm, and theoretically prove its accuracy. Extensive experimental results of a variety of real and synthetic networks demonstrate the effectiveness of our approach.
期刊：
Modern Physics Letters B,2019年33(06):1950057 ISSN：0217-9849
通讯作者：
He, Longhui
作者机构：
[He, Jun; Shan, Dongyong; He, Longhui; Xu, Hui] Cent S Univ, Sch Phys & Elect, Changsha 410083, Hunan, Peoples R China.;[Ghen, Zhiquan; He, Longhui] Hunan City Univ, Sch Commun & Elect Engn, Yiyang 413000, Peoples R China.;[Liu, Sheng] Hunan Inst Engn, Sch Mech Engn, Xiangtan 411104, Peoples R China.
通讯机构：
[He, Longhui] C;[He, Longhui] H;Cent S Univ, Sch Phys & Elect, Changsha 410083, Hunan, Peoples R China.;Hunan City Univ, Sch Commun & Elect Engn, Yiyang 413000, Peoples R China.
关键词：
Metamaterial perfect absorber;square ring structure;low frequency;magnetic metal
摘要：
A metal-dielectric-metal (MDM) sandwich metamaterial perfect absorber (MPA) with magnetic nickel metal has been designed. An optimal absorption of 99.28% at 404 MHz is achieved for MPA with thickness of 5.54 mm. Resonant absorption is demonstrated to be main mechanism according to analyses on surface current distributions and electromagnetic field distributions. Furthermore, the electromagnetic energy is mainly dissipated in magnetic metal with magnetic loss proportion of 55.43% by comparatively analyzing the wave-absorbing performance of using magnetic metal, non-magnetic metal and perfect electric conductor (PEC) as metallic layers. These results would provide a guidance for the design of quasi-microwave absorbing/shielding materials.
期刊：
IEEE INTERNET OF THINGS JOURNAL,2019年6(1):718-733 ISSN：2327-4662
通讯作者：
Qin, Hua
作者机构：
[Qin, Hua; Cao, Buwen; Zeng, Min; Chen, Weihong] Hunan City Univ, Coll Informat & Elect Engn, Yiyang 413000, Peoples R China.;[Li, Jessica; Peng, Yang] Univ Washington, Div Comp & Software Syst, Bothell, WA 98011 USA.
通讯机构：
[Qin, Hua] H;Hunan City Univ, Coll Informat & Elect Engn, Yiyang 413000, Peoples R China.
关键词：
Dual radio;energy efficiency;Internet of Things (IoT);pipeline
摘要：
The future Internet of Things (IoT) will enable Internet connectivity for a vast amount of battery-powered devices, which usually need to communicate with each other or to some remote gateways through multihop communications. Although ZigBee has become a widely used communication technology in IoT, Wi-Fi, on the other hand, has its unique advantages such as high throughput and native IP compatibility, despite its potentially higher energy consumption. With the development of IoT, more and more IoT devices are equipped with multiple radio interfaces, such as both Wi-Fi and ZigBee. Inspired by this, we propose a dual-interface dual-pipeline scheduling (DIPS) scheme, which leverages an activation pipeline mainly constructed by low-power ZigBee interfaces to wake up a data pipeline constructed by high-power Wi-Fi interfaces on demand, toward enabling multihop data delivery in IoT. The objective is to minimize network energy consumption while satisfying certain end-to-end delay requirements. Extensive simulations and prototype-based experiments have been conducted. The results show that the energy consumption of DIPS is 96.5% and 92.8% lower than that of the IEEE 802.11's standard power saving scheme and a state-of-the-art pipeline-based scheme in moderate traffic scenarios, respectively.
通讯机构：
[He, Longhui] C;[He, Longhui] H;Cent S Univ, Sch Phys & Elect, Changsha 410083, Hunan, Peoples R China.;Hunan City Univ, Coll Informat & Elect Engn, Yiyang 413000, Peoples R China.
关键词：
P band;Metamaterial absorber;Dual-peak absorption;Magnetic metal
摘要：
In order to investigate the effect of magnetic metal on the absorption performance of metamaterial absorber (MMA), a dual-peak MMA based on magnetic metal nickel is designed and demonstrated in the P-band (300–1000 MHz). Two-layer square-ring-metal resonator arrays and two-layer dielectric substrates are arranged alternately with each other to constitute the proposed dual-peak MMA backed with a reflective metal plate. The influences of copper or nickel metallic layers on the absorption coefficients are comparatively analyzed. For the nickel MMA, the dual-peak absorption coefficients of 99.82% and 99.09% are achieved at 394 MHz and 605 MHz, respectively. Moreover, the thickness of dual-peak MMA could be reduced to 9 mm by employing magnetic metal nickel. The physical mechanism of dual-peak absorption is illustrated by surface current distributions, magnetic field distributions and power loss density distributions. The relationship between the changes of geometric dimensions and the shift of peak absorption frequencies is ultimately discussed. These results could provide instructive guidance for realizing a thin dual-peak MMA in the P-band.
期刊：
Mitochondrial DNA Part B-Resources,2019年4(2):3513-3514 ISSN：2380-2359
通讯作者：
Xu, Zhenggang
作者机构：
[Huang, Tian] Hunan City Univ, Coll Informat & Elect Engn, Yiyang, Peoples R China.;[Zhou, Libo] Hunan Engn Res Ctr Internet Anim, Changsha, Hunan, Peoples R China.;[Xu, Zhenggang] Cent South Univ Forestry & Technol, Key Lab Forestry Remote Sensing Based Big Data &, Changsha 410004, Hunan, Peoples R China.
通讯机构：
[Xu, Zhenggang] C;Cent South Univ Forestry & Technol, Key Lab Forestry Remote Sensing Based Big Data &, Changsha 410004, Hunan, Peoples R China.
摘要：
Abstract The Collared Crow (Corvus pectoralis), in the order Passeriformes, it widely distributed in large areas encompassing China and northern Vietnam. It is a vulnerable bird that is of international concern. In this study, we first sequenced and described the complete mitochondrial genome and phylogeny of C. pectoralis. The results showed that the whole genome of C. pectoralis was 16,857 bp long and contains 13 PCGs, 2 ribosomal RNA genes, 23 transfer RNA genes, and 1 loop region. The overall base composition of the mitochondrial DNA was 31.13% for A, 29.52% for C, 24.46% for T, and 14.89% for G, with a GC content of 44.41%. The phylogenetic tree showed that C. pectoralis was clustered with C. brachyrhynchos and then together with other two crows in family Passeriformes. This information will be useful in the current understanding of the phylogeny and evolution of Passeriformes.
期刊：
OPTICS AND LASER TECHNOLOGY,2019年120:105699 ISSN：0030-3992
通讯作者：
Wen, Bing;Deng, Shuguang
作者机构：
[Zhang, Guangfu; Wen, Bing; Deng, Shuguang; Deng, Yangbao] Hunan City Univ, All Solid State Energy Storage Mat & Devices Key, Coll Informat & Elect Engn, Yiyang 413000, Peoples R China.;[Wen, Bing; Fu, Xiquan] Hunan Univ, Key Lab Micro Nanooptoelect Devices, Minist Educ, Coll Comp Sci & Elect Engn, Changsha 410082, Hunan, Peoples R China.
通讯机构：
[Wen, B; Deng, SG] H;Hunan City Univ, All Solid State Energy Storage Mat & Devices Key, Coll Informat & Elect Engn, Yiyang 413000, Peoples R China.
摘要：
We theoretically and numerically investigate the influence of high-order effects on a trapped soliton pumped by a high-power pulse during nonlinear propagation. According to the moment method, some evolution rules of a trapped soliton are found in the presence of high-order effects by theoretically analyzing five moment parameters. Further, the temporal and spectral evolutions of a trapped soliton are numerically studied in details. It is demonstrated that the third-order dispersion (TOD) only affects the center position of a trapped soliton, but it does not change the spectrum structure. The intrapulse Raman scattering (IRS) causes a trapped soliton to red-shift and modifies the spectrum structure, thus the asymmetric oscillation structure is generated in the lagging edge of a spectrum. The self-steepening (SS) mainly changes the distribution of red-shifted components, however, it has little effect on the blue-shifted spectrum. Moreover, suppression or enhancement of the Raman-induced frequency shift (RIFS) affected by TOD and SS is also discussed.
期刊：
Journal of Alloys and Compounds,2019年794:325-332 ISSN：0925-8388
通讯作者：
Zhou, Weiping;Tan, Weishi
作者机构：
[Wang, Xingyu; Zhou, Weiping; Ma, Chunlin] Nanjing Univ Sci & Technol, Sch Sci, Nanjing 210094, Jiangsu, Peoples R China.;[Zhai, Zhangyin; Ma, Chunlin] Huaiyin Normal Univ, Sch Phys & Elect Elect Engn, Huaian 223001, Peoples R China.;[Zhou, Weiping] Nanchang Univ, Sch Mat Sci & Engn, Nanchang 330031, Jiangxi, Peoples R China.;[Gan, Zhixing] Nanjing Normal Univ, Key Lab Optoelect Technol Jiangsu Prov, Sch Phys & Technol, Nanjing 210023, Jiangsu, Peoples R China.;[Tan, Weishi] Hunan City Univ, All Solid State Energy Storage Mat & Devices Key, Coll Informat & Elect Engn, Yiyang 413002, Peoples R China.
通讯机构：
[Zhou, Weiping] N;[Tan, Weishi] H;Nanjing Univ Sci & Technol, Sch Sci, Nanjing 210094, Jiangsu, Peoples R China.;Hunan City Univ, All Solid State Energy Storage Mat & Devices Key, Coll Informat & Elect Engn, Yiyang 413002, Peoples R China.
关键词：
Piezoelectric;Photoluminescence;Ferroelectric polarization;Electric field poling
摘要：
Luminescent piezoelectric materials promise a stratagem for controlling the optical process by electric field, which would benefit for future optoelectronic devices. Here, Er3+ doped (Ba0.85Ca0.15) (Zr0.1Ti0.9)O-3 (BCZT: Er3+) piezoelectric ceramics are prepared to demonstrate the proof of concept. In addition to excellent intrinsic piezoelectricity and ferroelectricity, BCZT: Er3+ ceramics exhibit simultaneously strong green upconversion emissions under excitation of 980 nm. Remarkable photoluminescence (PL) quenching phenomenon as well as significant changes on relative intensities of stark lines are observed under external poling electric field. Furthermore, field dependent piezoelectric constant d(33) and photoluminescence quenching ratio show similar variation trend and finally saturate for E > 3.5 kV/mm, which provides a noncontact strategy to monitor the piezoelectric constant d(33). The PL quenching triggered by electric field in BCZT: Er3+ ceramics is ascribed to the decreased asymmetry originating from field-induced structural transformation from a significant fraction of the tetragonal phase to rhombohedral phase. Our work would be helpful for expanding the scope of luminescent piezoelectric materials and promising future optoelectronic and optical devices with cross-coupled physical properties. (c) 2019 Elsevier B.V. All rights reserved.
作者：
Liu, H.;Zhang, Z. Z.;Wu, Y. J.;Dong, L. M.;Wang, H. O.;...
期刊：
Journal of Materials Science: Materials in Electronics,2019年30(20):18780-18787 ISSN：0957-4522
通讯作者：
Liu, H
作者机构：
[Liu, H.; Zhang, Z. Z.] Huaiyin Inst Technol, Fac Appl Technol, Huaian 223001, Peoples R China;[Wu, Y. J.] Fudan Univ, Inst Mol Mat & Devices, Dept Mat Sci, Shanghai 200438, Peoples R China;[Dong, L. M.] Changshu Inst Technol, Sch Automat Engn, Changshu 215500, Jiangsu, Peoples R China;[Wang, H. O.] Hangzhou Dianzi Univ, Inst Mat Phys, Hangzhou 310018, Zhejiang, Peoples R China;[Cao, M. X.] Peking Univ, Coll Chem & Mol Engn, Beijing 100871, Peoples R China
通讯机构：
[Liu, H.] H;Huaiyin Inst Technol, Fac Appl Technol, Huaian 223001, Peoples R China.
摘要：
A set of Ni doping Fe-Ga ribbons were fabricated using melt spinning method. The microstructure was studied using extended X-ray absorption fine structure spectroscopy (EXAFS), high resolution X-ray diffraction (HRXRD) and metallurgical microscope. The results of microstructure indicated that as Ni concentration increased, the lattice matrix transformed from body-centred cubic (bcc) to face-centred cubic (fcc), with the decrease of unit cell volume and the emergence of little amount B-2 and E2(1) phase. The result of magnetic and magnetostrictive properties showed that the saturation magnetization decreased with Ni doping. (110) texture in studied ribbons resulted in low saturation magnetic field and high saturation magnetostrction. In addition, small amount of precipitated phase E2(1) improved the magnetostricion of FeNiGa ribbons.
