• Complex
  • Title
  • Author
  • Keyword
  • Abstract
  • Scholars
Search
Sort by:
Default
  • Default
  • Title
  • Year
  • WOS Cited Count
  • Impact factor
  • Ascending
  • Descending
< Page ,Total 40 >
Asymmetric conical diffraction in dislocated edge-centered square lattices SCIE
期刊论文 | 2019 , 27 (5) , 6300-6309 | OPTICS EXPRESS
Abstract&Keyword Cite

Abstract :

We investigate linear and nonlinear evolution dynamics of light beams propagating along a dislocated edge-centered square lattice. The band structure and Brillouin zones of this novel lattice are analyzed analytically and numerically. Asymmetric Dirac cones as well as the corresponding Bloch modes of the lattice are obtained. By adopting the tight-binding approximation, we give an explanation of the asymmetry of Dirac cones. By utilizing the appropriate Bloch modes, linear and nonlinear asymmetric conical diffraction are demonstrated. We find that both the focusing and defocusing nonlinearities can enhance the asymmetry of the conical diffractions. (C) 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement

Cite:

Copy from the list or Export to your reference management。

GB/T 7714 Zhong, Hua , Wang, Rong , Belic, Milivoj R. et al. Asymmetric conical diffraction in dislocated edge-centered square lattices [J]. | OPTICS EXPRESS , 2019 , 27 (5) : 6300-6309 .
MLA Zhong, Hua et al. "Asymmetric conical diffraction in dislocated edge-centered square lattices" . | OPTICS EXPRESS 27 . 5 (2019) : 6300-6309 .
APA Zhong, Hua , Wang, Rong , Belic, Milivoj R. , Zhang, Yanpeng , Zhang, Yiqi . Asymmetric conical diffraction in dislocated edge-centered square lattices . | OPTICS EXPRESS , 2019 , 27 (5) , 6300-6309 .
Export to NoteExpress RIS BibTex
Generating Lieb and super-honeycomb lattices by employing the fractional Talbot effect SCIE
期刊论文 | 2019 , 36 (4) , 862-866 | JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
Abstract&Keyword Cite

Abstract :

We demonstrate a novel method for producing optically induced Lieb and super-honeycomb lattices, by employing the fractional Talbot effect of specific periodic beam structures. Our numerical and analytical results display the generation of Lieb and super-honeycomb lattices at fractional Talbot lengths effectively and with high beam quality. By adjusting the initial phase shifts of the interfering beams, the incident periodic beam structures, as well as the lattices with broken inversion symmetry, can be constructed in situ. This research suggests not only a possible practical utilization of the Talbot effect in the production of novel optically induced lattices but also in the studies of related optical topological phenomena. (C) 2019 Optical Society of America

Cite:

Copy from the list or Export to your reference management。

GB/T 7714 Zhong, Hua , Zhang, Yiqi , Belic, Milivoj R. et al. Generating Lieb and super-honeycomb lattices by employing the fractional Talbot effect [J]. | JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS , 2019 , 36 (4) : 862-866 .
MLA Zhong, Hua et al. "Generating Lieb and super-honeycomb lattices by employing the fractional Talbot effect" . | JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS 36 . 4 (2019) : 862-866 .
APA Zhong, Hua , Zhang, Yiqi , Belic, Milivoj R. , Zhang, Yanpeng . Generating Lieb and super-honeycomb lattices by employing the fractional Talbot effect . | JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS , 2019 , 36 (4) , 862-866 .
Export to NoteExpress RIS BibTex
Topological insulator properties of photonic kagome helical waveguide arrays SCIE
期刊论文 | 2019 , 12 , 996-1001 | RESULTS IN PHYSICS
Abstract&Keyword Cite

Abstract :

We investigate topological insulator properties of the kagome helical waveguide array, by utilizing theoretical and numerical means. The time-reversal symmetry of the kagome lattice is broken by helicity, and a photonic topological insulator is formed. The Berry curvature and Chern number of the band structure are calculated, to verify the topological phase transition, caused by the helicity. Unidirectional propagation and topological protection properties of the edge states at certain momentum values are demonstrated. Interestingly, the same kagome helical waveguide array, may support topological edge states with different momenta propagating along the same boundary but in opposite directions.

Keyword :

Edge state Topological insulator Kagome lattice

Cite:

Copy from the list or Export to your reference management。

GB/T 7714 Zhong, Hua , Wang, Rong , Ye, Fangwei et al. Topological insulator properties of photonic kagome helical waveguide arrays [J]. | RESULTS IN PHYSICS , 2019 , 12 : 996-1001 .
MLA Zhong, Hua et al. "Topological insulator properties of photonic kagome helical waveguide arrays" . | RESULTS IN PHYSICS 12 (2019) : 996-1001 .
APA Zhong, Hua , Wang, Rong , Ye, Fangwei , Zhang, Jingwen , Zhang, Lei , Zhang, Yanpeng et al. Topological insulator properties of photonic kagome helical waveguide arrays . | RESULTS IN PHYSICS , 2019 , 12 , 996-1001 .
Export to NoteExpress RIS BibTex
An Improved Recognition Approach for Noisy Multispectral Palmprint by Robust L2 Sparse Representation with a Tensor-Based Extreme Learning Machine. PubMed SCIE
期刊论文 | 2019 , 19 (2) | Sensors
Abstract&Keyword Cite

Abstract :

For the past decades, recognition technologies of multispectral palmprint have attracted more and more attention due to their abundant spatial and spectral characteristics compared with the single spectral case. Enlightened by this, an innovative robust L2 sparse representation with tensor-based extreme learning machine (RL2SR-TELM) algorithm is put forward by using an adaptive image level fusion strategy to accomplish the multispectral palmprint recognition. Firstly, we construct a robust L2 sparse representation (RL2SR) optimization model to calculate the linear representation coefficients. To suppress the affection caused by noise contamination, we introduce a logistic function into RL2SR model to evaluate the representation residual. Secondly, we propose a novel weighted sparse and collaborative concentration index (WSCCI) to calculate the fusion weight adaptively. Finally, we put forward a TELM approach to carry out the classification task. It can deal with the high dimension data directly and reserve the image spatial information well. Extensive experiments are implemented on the benchmark multispectral palmprint database provided by PolyU. The experiment results validate that our RL2SR-TELM algorithm overmatches a number of state-of-the-art multispectral palmprint recognition algorithms both when the images are noise-free and contaminated by different noises.

Keyword :

multispectral palmprint recognition adaptive weighted fusion WSCCI tensor based ELM robust L2 sparse representation

Cite:

Copy from the list or Export to your reference management。

GB/T 7714 Cheng Dongxu , Zhang Xinman , Xu Xuebin . An Improved Recognition Approach for Noisy Multispectral Palmprint by Robust L2 Sparse Representation with a Tensor-Based Extreme Learning Machine. [J]. | Sensors , 2019 , 19 (2) .
MLA Cheng Dongxu et al. "An Improved Recognition Approach for Noisy Multispectral Palmprint by Robust L2 Sparse Representation with a Tensor-Based Extreme Learning Machine." . | Sensors 19 . 2 (2019) .
APA Cheng Dongxu , Zhang Xinman , Xu Xuebin . An Improved Recognition Approach for Noisy Multispectral Palmprint by Robust L2 Sparse Representation with a Tensor-Based Extreme Learning Machine. . | Sensors , 2019 , 19 (2) .
Export to NoteExpress RIS BibTex
Independence-Checking Coding for OFDM Channel Training Authentication: Protocol Design, Security, Stability, and Tradeoff Analysis EI SCIE Scopus
期刊论文 | 2019 , 14 (2) , 387-402 | IEEE TRANSACTIONS ON INFORMATION FORENSICS AND SECURITY
WoS CC Cited Count: 6 SCOPUS Cited Count: 5
Abstract&Keyword Cite

Abstract :

In wireless orthogonal frequency-division multiplexing communications systems, pilot tones, due to their publicly known and deterministic characteristic, suffer significant jamming/nulling/spoofing risks. Thus, the convectional channel training protocol using pilot tones could be attacked and paralyzed, which raises the issue of anti-attack channel training authentication (CTA), i.e., verifying the claims of identities of pilot tones and channel estimation samples. In this paper, we consider one-ring scattering scenarios with large-scale uniform linear arrays (ULA) and develop an independence-checking coding (ICC) theory to build a secure and stable CTA protocol, namely, ICC-based CTA (ICC-CTA) protocol. In this protocol, the pilot tones are not only merely randomized and inserted into subcarriers but also encoded as diversified subcarrier activation patterns (SAPs) simultaneously. Those encoded SAPs, though camouflaged by malicious signals, can be identified and decoded into original pilots for high-accuracy channel impulse response (CIR) estimation. The CTA security is first characterized by the error probability of identifying legitimate CIR estimation samples. We prove that the identification error probability (IEP) is equal to zero under the continuously distributed mean angle of arrival (AoA) and also derive a closed-form expression of IEP under the discretely distributed case. The CTA instability is formulated as the function of probability of stably estimating CIR against all available diversified SAPs. A realistic tradeoff between the CTA security and instability under the discretely distributed AoA is identified and an optimally stable tradeoff problem is formulated, with the objective of optimizing the code rate to maximize security while maintaining maximum stability for ever. Solving this, we derive the closed-form expression of optimal code rate. Numerical results finally validate the resilience of proposed ICC-CTA protocol.

Keyword :

channel training Physical-layer authentication OFDM anti-attack independence-checking coding

Cite:

Copy from the list or Export to your reference management。

GB/T 7714 Xu, Dongyang , Ren, Pinyi , Ritcey, James A. . Independence-Checking Coding for OFDM Channel Training Authentication: Protocol Design, Security, Stability, and Tradeoff Analysis [J]. | IEEE TRANSACTIONS ON INFORMATION FORENSICS AND SECURITY , 2019 , 14 (2) : 387-402 .
MLA Xu, Dongyang et al. "Independence-Checking Coding for OFDM Channel Training Authentication: Protocol Design, Security, Stability, and Tradeoff Analysis" . | IEEE TRANSACTIONS ON INFORMATION FORENSICS AND SECURITY 14 . 2 (2019) : 387-402 .
APA Xu, Dongyang , Ren, Pinyi , Ritcey, James A. . Independence-Checking Coding for OFDM Channel Training Authentication: Protocol Design, Security, Stability, and Tradeoff Analysis . | IEEE TRANSACTIONS ON INFORMATION FORENSICS AND SECURITY , 2019 , 14 (2) , 387-402 .
Export to NoteExpress RIS BibTex
Hierarchical 2-D Feature Coding for Secure Pilot Authentication in Multi-User Multi-Antenna OFDM Systems: A Reliability Bound Contraction Perspective EI SCIE Scopus
期刊论文 | 2019 , 14 (3) , 592-607 | IEEE TRANSACTIONS ON INFORMATION FORENSICS AND SECURITY
SCOPUS Cited Count: 2
Abstract&Keyword Cite

Abstract :

Due to the publicly known and deterministic characteristic of pilot tones, pilot authentication (PA) in multi-user multi-antenna orthogonal frequency-division multiplexing systems is very susceptible to the jamming/nulling/spoofing behaviors. To solve this, in this paper, we develop a hierarchical 2-D feature (H2DF) coding theory that exploits the hidden pilot signal features, i.e., the energy feature and independence feature, to secure pilot information coding which is applied between legitimate parties through a well-designed five-layer hierarchical coding model to achieve secure multiuser PA (SMPA). The reliability of SMPA is characterized using the identification error probability (IEP) of pilot encoding and decoding with the exact closed-form upper and lower bounds. However, this phenomenon of non-tight bounds brings about the risk of long-term instability in SMPA. Therefore, a reliability bound contraction theory is developed to shrink the bound interval, and practically, this is done by an easy-to-implement technique, namely, codebook partition within the H2DF code. In this process, a tradeoff between the upper and lower bounds of IEP is identified and a problem of optimal upper and lower bound tradeoff is formulated, with the objective of optimizing the cardinality of sub-codebooks such that the upper and lower bounds coincide. Solving this, we finally derive an exact closed-form expression for IEP, which realizes a stable and highly reliable SMPA. Numerical results validate the stability and resilience of H2DF coding in SMPA.

Keyword :

channel training multi-user OFDM Physical-layer authentication anti-attack hierarchical 2-D feature coding

Cite:

Copy from the list or Export to your reference management。

GB/T 7714 Xu, Dongyang , Ren, Pinyi , Ritcey, James A. . Hierarchical 2-D Feature Coding for Secure Pilot Authentication in Multi-User Multi-Antenna OFDM Systems: A Reliability Bound Contraction Perspective [J]. | IEEE TRANSACTIONS ON INFORMATION FORENSICS AND SECURITY , 2019 , 14 (3) : 592-607 .
MLA Xu, Dongyang et al. "Hierarchical 2-D Feature Coding for Secure Pilot Authentication in Multi-User Multi-Antenna OFDM Systems: A Reliability Bound Contraction Perspective" . | IEEE TRANSACTIONS ON INFORMATION FORENSICS AND SECURITY 14 . 3 (2019) : 592-607 .
APA Xu, Dongyang , Ren, Pinyi , Ritcey, James A. . Hierarchical 2-D Feature Coding for Secure Pilot Authentication in Multi-User Multi-Antenna OFDM Systems: A Reliability Bound Contraction Perspective . | IEEE TRANSACTIONS ON INFORMATION FORENSICS AND SECURITY , 2019 , 14 (3) , 592-607 .
Export to NoteExpress RIS BibTex
Simple Synthesis of Cobalt Carbonate Hydroxide Hydrate and Reduced Graphene Oxide Hybrid Structure for High-Performance Room Temperature NH₃ Sensor. PubMed SCIE
期刊论文 | 2019 , 19 (3) | Sensors
Abstract&Keyword Cite

Abstract :

A novel hybrid structure sensor based on cobalt carbonate hydroxide hydrate (CCHH) and reduced graphene oxide (RGO) was designed for room temperature NH₃ detection. This hybrid structure consisted of CCHH and RGO (synthesized by a one-step hydrothermal method), in which RGO uniformly dispersed in CCHH, being used as the gas sensing film. The resistivity of the hybrid structure was highly sensitive to the changes on NH₃ concentration. CCHH in the hybrid structure was the sensing material and RGO was the conductive channel material. The hybrid structure could improve signal-to-noise ratio (SNR) and the sensitivity by obtaining the optimal mass proportion of RGO, since the proportion of RGO was directly related to sensitivity. The gas sensor with 0.4 wt% RGO showed the highest gas sensing response reach to 9% to 1 ppm NH₃. Compared to a conventional gas sensor, the proposed sensor not only showed high gas sensing response at room temperature but also was easy to achieve large-scale production due to the good stability and simple synthesis process.

Keyword :

cobalt carbonate hydroxide hydrate room temperature ammonia reduced graphene oxide gas sensor

Cite:

Copy from the list or Export to your reference management。

GB/T 7714 Wang Chang , Wang Huan , Zhao Dan et al. Simple Synthesis of Cobalt Carbonate Hydroxide Hydrate and Reduced Graphene Oxide Hybrid Structure for High-Performance Room Temperature NH₃ Sensor. [J]. | Sensors , 2019 , 19 (3) .
MLA Wang Chang et al. "Simple Synthesis of Cobalt Carbonate Hydroxide Hydrate and Reduced Graphene Oxide Hybrid Structure for High-Performance Room Temperature NH₃ Sensor." . | Sensors 19 . 3 (2019) .
APA Wang Chang , Wang Huan , Zhao Dan , Wei Xianqi , Li Xin , Liu Weihua et al. Simple Synthesis of Cobalt Carbonate Hydroxide Hydrate and Reduced Graphene Oxide Hybrid Structure for High-Performance Room Temperature NH₃ Sensor. . | Sensors , 2019 , 19 (3) .
Export to NoteExpress RIS BibTex
A Gas Sensing Channel Composited with Pristine and Oxygen Plasma-Treated Graphene. PubMed SCIE
期刊论文 | 2019 , 19 (3) | Sensors
Abstract&Keyword Cite

Abstract :

Oxygen plasma treatment has been reported as an effective way of improving the response of graphene gas sensors. In this work, a gas sensor based on a composite graphene channel with a layer of pristine graphene (G) at the bottom and an oxygen plasma-treated graphene (OP-G) as a covering layer was reported. The OP-G on top provided oxygen functional groups and serves as the gas molecule grippers, while the as-grown graphene beneath serves as a fast carrier transport path. Thus, the composite channel (OP-G/G) demonstrated significantly improved response in NH₃ gas sensing tests compared with the pristine G channel. Moreover, the OP-G/G channel showed faster response and recovering process than the OP-G channel. Since this kind of composite channel is fabricated from chemical vapor deposited graphene and patterned with standard photolithography, the device dimension was much smaller than a gas sensor fabricated from reduced graphene oxide and it is favorable for the integration of a large number of sensing units.

Keyword :

gas sensor graphene NH3 oxygen plasma treatment

Cite:

Copy from the list or Export to your reference management。

GB/T 7714 Wu Haiyang , Bu Xiangrui , Deng Minming et al. A Gas Sensing Channel Composited with Pristine and Oxygen Plasma-Treated Graphene. [J]. | Sensors , 2019 , 19 (3) .
MLA Wu Haiyang et al. "A Gas Sensing Channel Composited with Pristine and Oxygen Plasma-Treated Graphene." . | Sensors 19 . 3 (2019) .
APA Wu Haiyang , Bu Xiangrui , Deng Minming , Chen Guangbing , Zhang Guohe , Li Xin et al. A Gas Sensing Channel Composited with Pristine and Oxygen Plasma-Treated Graphene. . | Sensors , 2019 , 19 (3) .
Export to NoteExpress RIS BibTex
AUnet: An Unsupervised Method for Answer Reliability Evaluation in Community QA Systems EI Scopus
会议论文 | 2018 , 11268 LNCS , 281-292 | Asia Pacific Web (APWeb) and Web-Age Information Management (WAIM) Joint Conference on Web and Big Data, APWeb-WAIM 2018
Abstract&Keyword Cite

Abstract :

Recently, cQA websites such as Baidu Zhidao and StackExchange have exploded in popularity since everyone can post questions for other users to answer which fully realize the value of exchange. Nevertheless, the answers from different users for a same question may include errors, irrelevant messages or malicious advertisements due to the great different backgrounds of users. Hence, the automatic method for answer reliability evaluation is very important for improving users’ experience. However, the weakness of existing supervised methods is the high cost for they need a lot of annotated data. To alleviate such problems, we proposed a novel unsupervised answer evaluation method exploiting Answer-User association Network in this paper. Based on the constructed network, the reliability of answers and users can be obtained simultaneously by an iterative process. The experimental results on real word datasets show that our proposed method outperforms existing approaches. © 2018, Springer Nature Switzerland AG.

Keyword :

Automatic method Constructed networks High costs Iterative process Reliability Evaluation Supervised methods Unsupervised method User associations

Cite:

Copy from the list or Export to your reference management。

GB/T 7714 Ren, Ruoqing , Duan, Haimeng , Liu, Wenqiang et al. AUnet: An Unsupervised Method for Answer Reliability Evaluation in Community QA Systems [C] . 2018 : 281-292 .
MLA Ren, Ruoqing et al. "AUnet: An Unsupervised Method for Answer Reliability Evaluation in Community QA Systems" . (2018) : 281-292 .
APA Ren, Ruoqing , Duan, Haimeng , Liu, Wenqiang , Liu, Jun . AUnet: An Unsupervised Method for Answer Reliability Evaluation in Community QA Systems . (2018) : 281-292 .
Export to NoteExpress RIS BibTex
CaO-based chemical looping gasification of biomass for the production of hydrogen-enriched gas and CO2 negative emissions: A review EI Scopus
期刊论文 | 2018 , 19 (3-4) , 257-302 | International Journal of Energy for a Clean Environment
Abstract&Keyword Cite

Abstract :

Hydrogen as an energy carrier plays an important role in the energy consumption system. Compared to other technologies, CaO-based chemical looping gasifi cation of biomass (CaO-based CLGB) is a sustainable way for producing hydrogen-enriched gas and CO2 negative emissions. As the residence time of fi xed carbon in a gasifi er is short, the CO2 capture effi ciency of the CaO-based CLGB system is low. To conquer this problem, the CaO-based CLGB con fi guring with carbon stripper was discussed in this paper. The decay of the CO2 capture capacity of natural CaO-based sorbents is a main factor to restrain the development of CaO-based CLGB. Some promising methods have been applied to solve this problem. According to the purpose of technology, three representative technologies were discussed in this paper. Compared to other technologies, replacing natural or synthetic CaO-based sorbents is an economic and environmentally friendly solution. Calcium-rich industrial waste (CRIW) combined with the characteristics of cheapness, wide-source and environmental protection is an ideal substitute of CaO-based sorbents for replacing natural or synthetic CaO-based sorbents. The prospect of CRIW as a CaO-based sorbent was discussed in this paper. © 2018 by Begell House, Inc.

Keyword :

Biomass Gasification Chemical looping CO2 capture Energy carriers Enriched gas Production of hydrogen Residence time

Cite:

Copy from the list or Export to your reference management。

GB/T 7714 Cai, Jianjun , Wang, Shuzhong , Zeng, Ronghua et al. CaO-based chemical looping gasification of biomass for the production of hydrogen-enriched gas and CO2 negative emissions: A review [J]. | International Journal of Energy for a Clean Environment , 2018 , 19 (3-4) : 257-302 .
MLA Cai, Jianjun et al. "CaO-based chemical looping gasification of biomass for the production of hydrogen-enriched gas and CO2 negative emissions: A review" . | International Journal of Energy for a Clean Environment 19 . 3-4 (2018) : 257-302 .
APA Cai, Jianjun , Wang, Shuzhong , Zeng, Ronghua , Luo, Ming , Tang, Xingying . CaO-based chemical looping gasification of biomass for the production of hydrogen-enriched gas and CO2 negative emissions: A review . | International Journal of Energy for a Clean Environment , 2018 , 19 (3-4) , 257-302 .
Export to NoteExpress RIS BibTex
10| 20| 50 per page
< Page ,Total 40 >

Export

Results:

Selected

to

Format:
FAQ| About| Online/Total:3990/65801397
Address:XI'AN JIAOTONG UNIVERSITY LIBRARY(No.28, Xianning West Road, Xi'an, Shaanxi Post Code:710049) Contact Us:029-82667865
Copyright:XI'AN JIAOTONG UNIVERSITY LIBRARY Technical Support:Beijing Aegean Software Co., Ltd.