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Mechanical Modulation of Hybrid Graphene Microfiber Structure
Fei Xu,Jin-hui Chen,Yan-qing Lu
Physics , 2015,
Abstract: Recently, the strain engineering of two-dimensional materials such as graphene has attracted considerable attention for its great potential in functional nanodevices. Here, we theoretically and experimentally investigate the strain manipulation of a graphene-integrated microfiber system for the first time. We analyze the influential factors of strain tuning, i.e., the geometrical parameters of the microfiber, the strain magnitude, and the probe-light wavelength. Moreover, we experimentally achieve in-line modulation as high as 30% with a moderate strain of ~5%, which is two orders of magnitude larger than previous results. The dynamic vibration response is also researched. The broadband, polarization-independent, cost-effective, strain-based modulator may find applications in low-speed modulation and strain sensing. Further, we believe that our platform may allow for all-in fiber engineering of graphene-analogue materials and provide new ideas for graphene-integrated flexible device design.
1-(2-Hydroxy-5-methoxyphenyl)ethan-1-one N-[(E)-1-(2-hydroxy-5-methoxyphenyl)ethylidene]hydrazone
Jin-Hua Zhang,Wen-Liang Dong,Yan-Qing Ge,Bao-Xiang Zhao
Acta Crystallographica Section E , 2008, DOI: 10.1107/s1600536807064409
Abstract: In the title molecule, C18H20N2O4, which resides on a crystallographic centre of inversion (at the centre of the N—N bond), all non-H atoms apart from the methoxy substituent are approximately coplanar. The structure displays intramolecular O—H...N hydrogen bonding.
Platform for enhanced light-graphene interaction length and miniaturizing fiber stereo-devices
Fei Xu,Jun-long Kou,Jin-hui Chen,Ye Chen,Yan-qing Lu
Physics , 2014, DOI: 10.1364/OPTICA.1.000307
Abstract: Sufficient light-matter interactions are important for waveguide-coupled graphene optoelectronic devices. Using a microfiber-based lab-on-a-rod technique, we present a platform for ultra-long light-graphene interaction and design graphene-integrated helical microfiber (MF) devices. Using this approach, we experimentally demonstrate an in-line stereo polarizer by wrapping an MF on a rod pretreated with a graphene sheet. The device operates as a broadband (450 nm wavelength) polarizer capable of achieving an extinction ratio (ER) as high as ~8 dB/coil in the telecommunication band. Furthermore, we extend this approach to successfully demonstrate a high-Q graphene-based single-polarization resonator, which operates with an ER of ~11 dB with excellent suppression of polarization noise. The fiber-coil resonator shows great potential for sensing applications and gyro-integration. By specializing the rod surface and coil geometry, we believe the preliminary results reported herein could contribute to advancing the research for lab-on-a-rod graphene-MF-integrated devices.
Poly[[diaqua(ethanol)bis(μ3-pyridine-2,3-dicarboxylato)dimanganese(II)] monohydrate]
Yan-Qing Zhao
Acta Crystallographica Section E , 2009, DOI: 10.1107/s1600536809031948
Abstract: The title compound, {[Mn2(C7H3NO4)2(C2H5OH)(H2O)2]·H2O}n, is a three-dimensional polymer. There are two symmetry-independent MnII centres with different coordination environments: one MnII atom is coordinated by four O atoms from four ligands and two N atoms from two ligands, the other MnII atom is coordinated by three O atoms from two ligands, two water O atoms and the O atom of an ethanol molecule. The crystal structure is stabilized by O—H...O hydrogen bonds.
Logo Recognition Based on Membership Degree and Clossness Degree of Fuzzy Sets
基于模糊集隶属度特征和贴近度的徽标识别

WANG Gang,JIN Yan-qing,LIU Li-zhu,
王刚
,靳彦青,刘立柱

计算机科学 , 2009,
Abstract: Fuzzy information theory which is based on fuzzy theory is a departure from information science. Higher performance could be obtained in pattern recognition with fuzzy sets theory. People combined fuzzy sets theory with pattern recognition and established
Nonlinear Transformation of Orbital Angular Momentum through Quasi-phase Matching
Guang-hao Shao,Zi-jian Wu,Jin-hui Chen,Fei Xu,Yan-qing Lu
Physics , 2013, DOI: 10.1103/PhysRevA.88.063827
Abstract: We propose and investigate the quasi-phase matched (QPM) nonlinear optical frequency conversion of optical vortices in periodically poled Lithium Niobate (PPLN). Laguerre-Gaussian (LG) modes are used to represent the orbital angular momentum (OAM) states, characterized with the azimuthal and radial indices. Typical three-wave nonlinear interactions among the involved OAM modes are studied with the help of coupling wave equations. Being different from normal QPM process where the energy and quasi-momentum conservations are satisfied, both of the azimuthal and radial indices of the OAM states keep constant in most of the cases. However, abnormal change of the radial index is observed when there is asynchronous nonlinear conversion in different parts of the beams. The QPM nonlinear evolution of fractional OAM states is also discussed showing some interesting properties. In comparison with the traditional birefringent phase matching (BPM), the QPM technique avoids the undesired walk-off effect to reserve high-quality LG modes. We believe the QPM is an efficient way to convert, amplify and switch OAM states in various optical vortex related applications.
Ore-control Factors and Genesis of the Yingzuishan Altered Cataclastic Rock Type Gold Deposit, the West Sector of the Northern Qilian Mountains
北祁连西段鹰咀山蚀变碎裂岩型金矿床控矿因素和成因

YE De-jin,ZHANG Zuo-heng,ZHAO Yan-qing,
叶得金
,张作衡,赵彦庆

地球学报 , 2003,
Abstract: 本文论述了北祁连西段鹰咀山金矿床区域地质背景、矿床成矿地质条件、矿体特征、围岩蚀变、矿化和矿床地球化学特点,认为金矿床主要受多级断裂系统和火山碎屑岩控制,金矿化与蚀变碎裂岩带关系密切,是一种蚀变碎裂岩型金矿床。流体包裹体测温结果为中高温,成分以低盐度以及富CO2和H2O为特征;稳定同位素组成表明,成矿流体早期以岩浆水为主,晚期混有大量大气降水。
Isolation and Identification of a 4-Aminobenzenesulphonate Biodegrading Strain and Its Degradation Characteristics
对氨基苯磺酸降解菌的分离鉴定及降解特性研究

WANG Yan-qing,ZHANG Jin-song,ZHOU Ji-ti,WANG Jing,
王艳青
,张劲松,周集体,王竞

环境科学 , 2009,
Abstract: 对大连某城市污水处理厂活性污泥进行长期驯化,筛选得到好氧条件下以对氨基苯磺酸(4-aminobenzenesulphonate,4-ABS)为唯一碳源和能源生长的高效降解菌株W1.根据菌株W1的形态特征、生理生化特征及16S rDNA序列分析,初步鉴定为Pannonibacter菌属.通过考察生长条件对降解效果的影响,确定了该菌株降解4-ABS的优化条件为:接种量10%、 30℃、 pH 7、摇床转速150 r/min,并且在有外加碳源的情况下仍保持较高的4-ABS降解活性.在4-ABS的降解过程中,4-ABS自身含有的氨基和磺酸基会以NH+4和SO2-4的形式释放到水体中,但浓度仅为理论释放量的77.6%和91.5%,推测原因是部分释放的NH+4和SO2-4被菌株W1作为氮源和硫源利用;菌株W1可以耐受2 500 mg/L的4-ABS,且在32 h内实现90%的降解率;4-ABS降解率为94.7%时,可以实现84.4%的TOC去除率,且没有检测到其它芳香化合物生成,表明菌株W1可以实现4-ABS的彻底矿化.
Fast Asian Script Identification Based on Multi-feature
基于多特征融合的东亚文种识别

WANG Gang,JIN Yan-qing,LIU Li-zhu,CHU Rui-lai,
王刚
,靳彦青,刘立柱,储瑞来

计算机科学 , 2013,
Abstract: 针对目前基于统计特征和符号匹配的识别方法对字体较敏感的问题,提出一种基于多特征融合的东亚文种识别算法。该算法首先分析并提取高频形状特征、排版特征以及字符复杂度特征,然后采用模糊集贴近度准则进行识别。实验结果表明,该算法具有较高的识别准确率,并对不同字体具有较强的鲁棒性。
Polarization-dependent all-optical modulator with ultra-high modulation depth based on a stereo graphene-microfiber structure
Fei Xu,Jin-hui Chen,Bi-cai Zheng,Guang-hao Shao,Shi-jun Ge,Yan-qing Lu
Physics , 2015,
Abstract: We report an in-line polarization-dependent all-optical fiber modulator based on a stereo graphene-microfiber structure (GMF) by utilizing the lab-on-rod technique. Owing to the unique spring-like geometry, an ultra-long GMF interaction length can be achieved, and an ultra-high modulation depth (MD) of ~7.5 dB and a high modulation efficiency (ME) of ~0.2 dB/mW were demonstrated for one polarization state. The MD and ME are more than one order larger than those of other graphene-waveguide hybrid all-optical modulators. By further optimizing the transferring and cleaning process, the modulator can quickly switch between transparent and opaque states for both the two polarization states with a maximized MD of tens of decibels. This modulator is compatible with current fiber-optic communication systems and may be applied in the near future to meet the impending need for ultrafast optical signal processing.
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