摘要：
A variety of recognizing architectures based on deep convolutional neural networks have been devised for labeling videos containing human motion with action labels. However, so far, most works cannot properly deal with the temporal dynamics encoded in multiple contiguous frames, which distinguishes action recognition from other recognition tasks. This paper develops a temporal extension of convolutional neural networks to exploit motion-dependent features for recognizing human action in video. Our approach differs from other recent attempts in that it uses multiplicative interactions between convolutional outputs to describe motion information across contiguous frames. Interestingly, the representation of image content arises when we are at work on extracting motion pattern, which makes our model effectively incorporate both of them to analysis video. Additional theoretical analysis proves that motion and content-dependent features arise simultaneously from the developed architecture, whereas previous works mostly deal with the two separately. Our architecture is trained and evaluated on the standard video actions benchmarks of KTH and UCF101, where it matches the state of the art and has distinct advantages over previous attempts to use deep convolutional architectures for action recognition.
摘要：
Interfacial resistive switching features are highly dependent on the distribution of the carrier traps in the interface. However, the lack of probing seriously restricts ways of offering physical insights into its mechanism and improving interfacial resistors. In this work, we investigated a resistive switching interface that consists of Bi2S3 nano networks (BSNN) and F-doped SnO2 (FTO), uncovering the relationship between the decay of the photoconductance in BSNN and interfacial trap distribution. Based on this, we suggest a general method to probe the distribution of various interface traps. This method provides us with a new tool to study the interfacial trap distribution in an interfacial resistor, and it might also be used to understand other interface problems.
摘要：
An all-fiber temperature sensor based on a Sagnac loop is demonstrated experimentally. The sensor head comprises single-mode-multimode-polarization-maintaining (SMP) fiber structure and a tilted long period fiber grating. By measuring the peak wavelength shift, the temperature can be determined. Experimentally we have achieved a sensitivity of 1.5 nm/degrees C when the sensor head is reeled into a round with the radius of 10cm. (C) 2015 Elsevier GmbH. All rights reserved.
通讯机构：
[Tian, Ye] H;Hunan City Univ, Sch Commun & Elect Engn, Yiyang 413000, Hunan, Peoples R China.
关键词：
Effective refractive index;Near ultraviolet;Numerical simulation;Physical vapor deposition;Raman scattering;Thin films
摘要：
Hybrid nanostructures composed of plasmonic metal and semiconductor are receiving increasing attentions, owing to their unique optical features that are induced by the co-existence of localized surface plasmon resonance (SPR) and semiconduction as well as the synergistic interactions between these two components. Other than the structures based on conventional noble metals, a cost-effective structure based on non-noble metal is studied in this work. Utilizing the surface dewetting in Bi-Si system, the Bi-nanorod/Si-nanodots hybrid structure (BSHS) is prepared by alternated sputtering of Bi and Si at low rate. The shift, split, and high order excitation of SPRs in BSHS are studied combining numerical and theoretical simulation. Calculations of the optical extinction performed as a function of the size of BSHS show a guideline to tune its spectra.
摘要：
Recently, hierarchical nanostructures have attracted increasing attention because of their large specific surface area and abundant physical characteristics. Here we propose a hierarchical Bi2S3 nested nano-network (Bi2S3-3N) with an excellent thermally-stable lattice structure, which is prepared by topotactic transformation. Experimental results revealed that for the first time, Bi2S3-3N possesses an interesting nature of the repetitively-operable persistent photoconductivity, which is believed to stem from the releasing of photo-stimulated carriers captured by deep-level traps. This work shows great potential of topotactic transformed Bi2S3 hierarchical nanostructures in practical applications like functional porous nanoarchitectures, bistable optical-switching, photo detectors, memory, etc.
作者机构：
[He, Zhihui; Zhan, Shiping; Chen, Zhiquan; Li, Boxun; Xu, Hui; Li, Hongjian] Cent S Univ, Coll Phys & Elect, Changsha 410083, Hunan, Peoples R China.;[Chen, Zhiquan] Hunan City Univ, Coll Commun & Elect Engn, Yiyang 413000, Peoples R China.
通讯机构：
[Li, Hongjian] C;Cent S Univ, Coll Phys & Elect, Changsha 410083, Hunan, Peoples R China.
关键词：
Surface Plasmon Polaritons;Fano resonance;Sensor;Sensitivity;Figure of merit
摘要：
Sensing characteristics based on Fano resonance in a rectangular ring resonator with a stub are investigated numerically. Simulation results show that a sharp and asymmetric Fano-line shape emerges in the proposed structure. Through tuning the width and length of the stub, it is found that the width and length play an important role in optimizing the sensing characteristic. Using the sharp and asymmetric Fano-line shape a highly sensitive plasmonic nanosensor with the sensitivity of 1000 nm/RIU and a tunable figure of merit (FOM) can be attained. The maximum FOM can reach up to 992,800 when the stub length d=120 nm, width l=130 nm and the refractive index difference Delta n=0.05, which is larger than that in previous reports. In addition, the results show that a larger FOM can be obtained by tuning the stub width than tuning its length. The proposed model and results provide guidance for fundamental research of the plasmonic nanosensor applications and designs. (C) 2015 Elsevier B.V. All rights reserved.
通讯机构：
[Xu, Yuming] H;Hengyang Normal Univ, Dept Comp Sci, Hengyang 421008, Hunan, Peoples R China.
关键词：
Artificial Chemical Reaction Optimization;Job Scheduling;Makespan;NP-Hard Problem
摘要：
The non-deterministic polynomial-time-hard job scheduling problem can be regarded as the optimal assignment of a set of jobs to a set of computing nodes to minimize the completion time. Such problems can be efficiently addressed through a meta-heuristic optimization approach, such as the new artificial chemical reaction optimization method. This approach mimics a chemical reaction process in which reactants interact with one another to reach the minimum enthalpy (potential energy) state. Therefore, this study proposes a novel approach of artificial chemical reaction optimization for job scheduling (ACROAJS) in grid computing environments based on the recently proposed chemical reaction-inspired meta-heuristic. Software simulation results show that the proposed ACROAJS algorithm significantly improves job schedule quality (makespan) in grid computing environments compared with two existing solutions [genetic algorithm and heterogeneous earliest finish time algorithm] over a set of randomly generated graphs and over graphs for real-world problems with various characteristics. With this algorithm, makespan was reduced by approximately 5.06% on average.
摘要：
We present an analytical study on intrinsic localized modes (ILMs) in the quantum β-Fermi–Pasta–Ulam lattice model with first- and second-nearest neighbor interactions by means of the semiclassical approach. We quantize the lattice model Hamiltonian by introducing vibron creation and annihilation operators, and retaining only number conserving terms. The coherent state representation is considered as the basic representation of the quantum lattice system. In order to obtain the ILM solutions, we adopt the multiple scales method combined with a quasidiscreteness approximation. It is found that, when the system parameters satisfy K2>4K2′, at the Brillouin zone (BZ) boundary, a bright ILM occurs above the top of the harmonic wave frequency band. While for K2<4K2′, our results indicate that at wave number kc a bright ILM occurs above the top of the harmonic wave frequency band and at the BZ boundary, the system support a dark intrinsic localized resonant mode.
摘要：
We study the dynamic properties of magnetic nanoclements with tapered ends by using micromagnetic simulations. It is found that the spin-wave modes can be effectively manipulated by the element shape. With the increase of the end sharpness (described by tapering parameter h), the frequency of the spin-wave edge mode increases rapidly and its oscillation areas in the both ends of element gradually increase and move toward to the central area. Finally, the edge mode completely merges into the fundamental mode. During the magnetization reversal processes, the edge mode experiences one or two softening depending on h < 60 nm or 60 nm < h < 100 Rm. When h > 100 nm, it is the fundamental mode that goes to zero at the switching held. The evolution of the spin-wave modes reflects the change of the micromagnetic structures of the elements during the reversal It is the softening of the edge mode that triggers the magnetization reversal in elements with h < 100 nm. The quasi-uniform reversal in the elements with h > 100 nm is induced by the softening of the fundamental mode, where the edge mode is completely suppressed. The results presented in this work demonstrate that the dynamic properties and the magnetization reversal can be effectively tuned by changing the shape of the nanoelements and may be useful for designing the nanoscale magnetic devices. (C) 2015 Elsevier B.V. All rights reserved
期刊：
JOURNAL OF MECHANICS,2015年31(5):515-523 ISSN：1727-7191
通讯作者：
Cai, J. -L.
作者机构：
[Huang, W. -L.] Hunan City Univ, Dept Phys & Telecom Engn, Yiyang, Peoples R China.;[Cai, J. -L.] Hangzhou Normal Univ, Coll Sci, Hangzhou, Zhejiang, Peoples R China.
通讯机构：
[Cai, J. -L.] H;Hangzhou Normal Univ, Coll Sci, Hangzhou, Zhejiang, Peoples R China.
关键词：
Non-holonomic system;Variable mass;Mei symmetry;Inverse problem
摘要：
The inverse problem of the Mei symmetry for nonholonomic systems with variable mass is studied. Firstly, the authors discuss the Mei symmetry of the holonomic system opposite to a nonholonomic system. Secondly, weak and strong Mei symmetries of a nonholonomic system are concluded through restriction equations and additional restriction equations. Thirdly, the relevant conserved quantity is deduced by means of the structure equation for the gauge function. Fourthly, the inverse problem of the Mei symmetry is obtained by the Noether symmetry. Finally, the paper offers an example to illustrate the application of the research result.
期刊：
International Journal of Distributed Sensor Networks,2014年10(1) ISSN：1550-1477
通讯作者：
Liao, Zhiping
作者机构：
[Liao, Zhiping; Xi, Shengfeng] Hunan City Univ, Informat Sci & Engn Coll, Yiyang 413000, Peoples R China.;[Liu, Song] Hunan City Univ, Commercial Coll, Yiyang 413000, Peoples R China.
通讯机构：
[Liao, Zhiping] H;Hunan City Univ, Informat Sci & Engn Coll, Yiyang 413000, Peoples R China.
摘要：
Message propagation is a primary means to locate resources in current unstructured peer-to-peer (P2P) systems and how to reduce effectively the redundant messages of propagation while keeping its high network coverage is what many researchers go in for in this field. In this paper, we propose the algorithm of LMPR, a scheme of improved MPR for message propagation in distributed unstructured P2P system. Based on analyzing the process and message redundancy of MPR, this paper proposes to add to such scheme a mechanism of specified relay-list to reduce further the number of its retransmitting of message. By attaching to each relay-peer a relay-list with peers it will relay message to, the scheme can assure that in the view of each decision-peer a broadcast message can be dispatched and only be dispatched once to every neighbor peer within 2 hops of it. Simulation results show that the scheme of LMPR has better performance than that of MPR in message redundancy, network overhead, and fluctuation brought to the system.
摘要：
Small-scale self-focusing (SF) causes rapid increase in the partial spatial intensity, breaking up the spatial profile of the beam into an intensity increasing zone (IZ) and a non-increasing zone (NIZ). We measure the evolutions of the pulse width at the IZ and NIZ with small-scale SF, and our results show that the pulse width at the IZ becomes narrower with increasing partial spatial intensity. The pulse width at the NIZ is almost unchanged with increasing laser power. We find that our experimental results are in good agreement with an approximate theoretical analysis.
摘要：
We study the physical-vapor-deposition of 1D bismuth nanostructures. Bi nanowire elongating along [012] and/or [110] direction as well as anisotropic Bi nano-columns are physical-vapor-deposited successfully. The coexistence and competition of surface diffusion and geometric shielding are critical to their formation as well as growth mode transition among them. Since physical-vapor-deposition is a vacuum process, we make use of it to fabricate the ohmic contact to prevent the damage to the bismuth nanostructures brought by the etching to their thick surface oxide layer.
