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Optimization-based mode selection scheme for OAM millimeter wave system in the off-axis misalignment case
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作者 Haie Dou Lei Wang +1 位作者 Bin Kang Baoyu Zheng 《Digital Communications and Networks》 SCIE CSCD 2024年第1期101-108,共8页
Millimeter-wave transmission combined with Orbital Angular Momentum(OAM)has the advantage of reducing the loss of beam power and increasing the system capacity.However,to fulfill this advantage,the antennas at the tra... Millimeter-wave transmission combined with Orbital Angular Momentum(OAM)has the advantage of reducing the loss of beam power and increasing the system capacity.However,to fulfill this advantage,the antennas at the transmitter and receiver must be parallel and coaxial;otherwise,the accuracy of mode detection at the receiver can be seriously influenced.In this paper,we design an OAM millimeter-wave communication system for overcoming the above limitation.Specifically,the first contribution is that the power distribution between different OAM modes and the capacity of the system with different mode sets are analytically derived for performance analysis.The second contribution lies in that a novel mode selection scheme is proposed to reduce the total interference between different modes.Numerical results show that system performance is less affected by the offset when the mode set with smaller modes or larger intervals is selected. 展开更多
关键词 Orbital angular momentum Millimeter wave Off-axis misalignment Mode selection Capacity
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Research on Selection of Equipment Maintenance Modes 被引量:1
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作者 SHANG Wen-li SHI Hai-bo HE Bai-tao 《International Journal of Plant Engineering and Management》 2006年第3期151-157,共7页
The development of equipment maintenance management is introduced, and equipment maintenance concept is defined. Equipment maintenance modes are classified, analyzed and compared, which merits and demerits are pointed... The development of equipment maintenance management is introduced, and equipment maintenance concept is defined. Equipment maintenance modes are classified, analyzed and compared, which merits and demerits are pointed out. At last, a decision-making frame to select equipment maintenance modes is advanced, and steps to select and implement equipment maintenance are given. 展开更多
关键词 equipment maintenance preventive maintenance maintenance mode selection
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Anti-symmetric sampled grating quantum cascade laser for mode selection
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作者 郭强强 张锦川 +6 位作者 程凤敏 卓宁 翟慎强 刘俊岐 王利军 刘舒曼 刘峰奇 《Chinese Physics B》 SCIE EI CAS CSCD 2023年第3期270-275,共6页
For mode selection in a quantum cascade laser(QCL),we demonstrate an anti-symmetric sampled grating(ASG).The wavelength of the-1-th mode of this laser has been blue-shifted more than 75 nm(~10 cm^(-1))compared with th... For mode selection in a quantum cascade laser(QCL),we demonstrate an anti-symmetric sampled grating(ASG).The wavelength of the-1-th mode of this laser has been blue-shifted more than 75 nm(~10 cm^(-1))compared with that of an ordinary sampled grating laser with an emission wavelength of approximately 8.6μm,when the periodicities within both the base grating and the sample grating are kept constant.Under this condition,an improvement in the continuous tuning capability of the QCL array is ensured.The ASG structure is fabricated in holographic exposure and optical photolithography,thereby enhancing its flexibility,repeatability,and cost-effectiveness.The wavelength modulation capability of the two channels of the grating is insensitive to the variations in channel size,assuming that the overall waveguide width remains constant.The output wavelength can be tailored freely within a certain range by adjusting the width of the ridge and the material of the cladding layer. 展开更多
关键词 sample grating tilted grating quantum cascade laser mode selection
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Mode Selection and Resource Allocation for Deviceto-Device Communications in 5G Cellular Networks 被引量:6
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作者 Fan Jiang Benchao Wang +2 位作者 Changyin Sun Yao Liu Rong Wang 《China Communications》 SCIE CSCD 2016年第6期32-47,共16页
To meet the increasing demand of wireless broadband applications in future 5G cellular networks, Device-to-Device(D2D) communications serve as a candidate paradigm to improve spectrum efficiency. Considering the chall... To meet the increasing demand of wireless broadband applications in future 5G cellular networks, Device-to-Device(D2D) communications serve as a candidate paradigm to improve spectrum efficiency. Considering the challenges after D2 D transmission is introduced for future cellular networks, this paper deals with mode selection and resource allocation issues related with D2 D communications. First, we propose a mode selection scheme which aims at guaranteeing the transmission of cellular users and also considering the potential interference. We analyze the condition under which D2 D underlay mode should be used. Second, we answer the question of "how to effectively reuse cellular resource once underlaying mode is adopted". We further present a resource allocation scheme that focuses on minimizing overall interference as well as a power control method to improve the performance of D2 D systems. Simulation results demonstrate that system parameters greatly affect the switching condition of mode selection and probability of choosing underlay mode. Furthermore, for D2 D underlaying scenario, the proposed resource allocation algorithm guarantees the transmission of cellular users with consideration of transmission requirements of D2 D users. Hence, the proposed scheme can achieve better user experience. 展开更多
关键词 device-to-device communication mode selection resource allocation power control
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Joint Power Allocation and Mode Selection for D2D Communications with Imperfect CSI 被引量:4
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作者 MA Bei ZHANG Hailin ZHANG Zhaowei 《China Communications》 SCIE CSCD 2015年第7期73-81,共9页
Device-to-device(D2D) communications can be underlaid with a cellular infrastructure to increase resource utilization, improve user throughput and save battery energy. In such networks, power allocation and mode selec... Device-to-device(D2D) communications can be underlaid with a cellular infrastructure to increase resource utilization, improve user throughput and save battery energy. In such networks, power allocation and mode selection are crucial problems. To address the joint optimization of power and mode selection under imperfect CSI, we propose an optimal, energy-aware joint power allocation and mode selection(JPAMS) scheme. First, we derive the closed-form solution for the power minimization for both D2 D and cellular links while satisfying different quality of service(Qo S) constraints. Second, we address the mode selection problem in presence of imperfect CSI, based on the derived power allocation. Moreover, the theoretical analysis and simulation results are presented to evaluate the proposed scheme for the D2 D communications. 展开更多
关键词 power allocation mode selection D2D communications imperfect CSI ENERGY-AWARE
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溶剂红135染料中六氯苯含量的测定
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作者 廖晓 张以永 《分析测试学报》 CAS CSCD 北大核心 2007年第z1期360-361,共2页
Determination of hexachlorobenzene (HCB) in the solvent red 135 by solvent extraction GC-MS with selected ion monitoring mode.The result showed that the detection limit is 0.05 mg/kg.The relative standard deviation is... Determination of hexachlorobenzene (HCB) in the solvent red 135 by solvent extraction GC-MS with selected ion monitoring mode.The result showed that the detection limit is 0.05 mg/kg.The relative standard deviation is 3.3%.This method is suitable for the analysis of the HCB in the solvent red 135. 展开更多
关键词 Solvent extraction Gas chormatograhpy-mass spectrometry Selected ion monitoring mode HEXACHLOROBENZENE C.I.solvent red 135
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Social-Aware Joint Mode Selection and Link Allocation for Device-to-Device Communication Underlaying Cellular Networks 被引量:1
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作者 Lianxin Yang Dan Wu +2 位作者 Hongkui Shi Yanshan Long Yueming Cai 《China Communications》 SCIE CSCD 2018年第8期92-107,共16页
Joint mode selection and link allocation are crucial to achieve the advantage of Device-to-Device(D2 D) communications in improving spectral efficiency. In practice, cellular users tend to not be totally altruistic or... Joint mode selection and link allocation are crucial to achieve the advantage of Device-to-Device(D2 D) communications in improving spectral efficiency. In practice, cellular users tend to not be totally altruistic or absolutely selfish. How to stimulate them to devote their links and how to allocate their links to D2 D pair candidates efficiently are two main challenges. In this paper, we encourage cellular users through the variable payment with regard to the social tie strength between cellular users and D2 D pair candidates. In particular, the social tie strength is inferred through a graph inference model and its impact on the payment is quantified as a negative exponential function. Then, we propose a resource scheduling optimization model based on the non-transferable utility coalition formation game, and a distributed coalition formation algorithm based on the Pareto preference and merge-and-split rule. From them, the final coalition structure is obtained, which reflects the strategy of mode selection and link allocation. Numerical results are presented to verify the effectiveness of our proposed scheme. 展开更多
关键词 D2D communication mode selection link allocation social ties coalition formation game
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Power allocation and mode selection methods for cooperative communication in the rectangular tunnel 被引量:2
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作者 Zhai Wenyan Sun Yanjing +1 位作者 Xu Zhao Li Song 《International Journal of Mining Science and Technology》 SCIE EI CSCD 2015年第2期253-260,共8页
For the multipath fading on electromagnetic waves of wireless communication in the confined areas,the rectangular tunnel cooperative communication system was established based on the multimode channel model and the ch... For the multipath fading on electromagnetic waves of wireless communication in the confined areas,the rectangular tunnel cooperative communication system was established based on the multimode channel model and the channel capacity formula derivation was obtained.On the optimal criterion of the channel capacity,the power allocation methods of both amplifying and forwarding(AF) and decoding and forwarding(DF) cooperative communication systems were proposed in the limitation of the total power to maximize the channel capacity.The mode selection methods of single input single output(SISO) and single input multiple output(SIMO) models in the rectangular tunnel,through which the higher channel capacity can be obtained,were put forward as well.The theoretical analysis and simulation comparison show that,channel capacity of the wireless communication system in the rectangular tunnel can be effectively enhanced through the cooperative technology;channel capacity of the rectangular tunnel under complicated conditions is maximized through the proposed power allocation methods,and the optimal cooperative mode of the channel capacity can be chosen according to the cooperative mode selection methods given in the paper. 展开更多
关键词 Rectangular tunnel Multimode channel model Channel capacity Cooperative communication Power allocation Mode selection
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Mode analysis and design of 0.3-THz Clinotron
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作者 李爽 王建国 +2 位作者 王光强 曾鹏 王东阳 《Chinese Physics B》 SCIE EI CAS CSCD 2016年第10期501-508,共8页
To develop a high-power continuous-wave terahertz source, a Clinotron operating at 0.3 THz is investigated. Based on the analyses of field distribution and coupling impedance, the dispersion characteristic of a rectan... To develop a high-power continuous-wave terahertz source, a Clinotron operating at 0.3 THz is investigated. Based on the analyses of field distribution and coupling impedance, the dispersion characteristic of a rectangular resonator is preliminarily studied. The effective way to select fundamental mode to interact with the electron beam is especially studied.Finally, the structure is optimized by particle-in-cell simulation, and the problems of manufacture tolerance, current density threshold, and heat dissipation during Clinotron’s operation are also discussed. The optimum device can work with a good performance under the conditions of 8 k V and 60 m A. With the generation of signal frequency at 315.89 GHz and output power at 12 W on average, this device shows great prospects in the application of terahertz waves. 展开更多
关键词 TERAHERTZ Clinotron mode selection particle simulation
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A high-power subterahertz surface wave oscillator with separated overmoded slow wave structures
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作者 王光强 王建国 +2 位作者 曾鹏 王东阳 李爽 《Chinese Physics B》 SCIE EI CAS CSCD 2016年第12期485-491,共7页
A megawatt-level subterahertz surface wave oscillator (SWO) is proposed to obtain high conversion efficiency by using separated overmoded slow wave structures (SWSs). Aiming at the repetitive operation and practic... A megawatt-level subterahertz surface wave oscillator (SWO) is proposed to obtain high conversion efficiency by using separated overmoded slow wave structures (SWSs). Aiming at the repetitive operation and practical applications, the device driven by electron beam with modest energy and current is theoretically analyzed and verified. Then, the functions of the two SWS sections and the effect of the drift tube are investigated by using a particle-in-cell code to reveal how the proposed device achieves high efficiency. The mode analysis of the beam-wave interaction region in the device is also carded out, and the results indicate that multi-modes participate in the premodulation of the electron beam in the first SWS section, while the TM01 mode surface wave is successfully and dominantly excited and amplified in the second SWS section. Finally, a typical simulation result demonstrates that at a beam energy of 313 keV, beam current of 1.13 kA, and guiding magnetic field of above 3.5 T, a high-power subterahertz wave is obtained with an output power of about 70 MW at frequency 146.3 GHz, corresponding to the conversion efficiency of 20%. Compared with the results of the previous subterahertz overmoded SWOs with integral SWS and similar beam parameters, the efficiency increases almost 50% in the proposed device. 展开更多
关键词 TERAHERTZ surface wave oscillator mode selection particle simulation
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Visible-light all-fiber vortex lasers based on mode selective couplers
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作者 Chuchu Dong Jinhai Zou +4 位作者 Hongjian Wang Han Yao Xianglong Zeng Yikun Bu Zhengqian Luo 《Chinese Physics B》 SCIE EI CAS CSCD 2020年第9期136-141,共6页
We demonstrate visible-light all-fiber vortex lasers by incorporating the home-made mode selective couplers (MSCs). The MSC at green or red wavebands is fabricated by specially designing and fusing a single-mode fiber... We demonstrate visible-light all-fiber vortex lasers by incorporating the home-made mode selective couplers (MSCs). The MSC at green or red wavebands is fabricated by specially designing and fusing a single-mode fiber (SMF) and a few-mode fiber (FMF). The MSCs inserted into visible fiber cavities act as power splitters and mode converters from the LP01 to LP11 mode at green and red wavelengths, respectively. The red-light all-fiber vortex laser is formed by a 10-cm Pr3+/Yb3+:ZBLAN fiber, a fiber Bragg grating, a fiber end-facet mirror and the MSC at 635 nm, which generates vortex beams with OAM±1 at 634.4 nm and an output power of 13 mW. The green-light all-fiber vortex laser consists of a 12-cm Ho3+:ZBLAN fiber, two fiber pigtail mirrors, and the MSC at 550 nm, which generates vortex beams with OAM±1 at 548.9 nm and an output power of 3 mW. 展开更多
关键词 fiber laser vortex laser mode selective coupler VISIBLE-LIGHT
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Ten-Dimensional Quantum Dynamics Study of H+CH_(3)D→H_(2)+CH_(2)D Reaction
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作者 Mingjuan Yang Tong Cheng +2 位作者 Rui Zheng Hongwei Song Minghui Yang 《Chinese Journal of Chemical Physics》 SCIE EI CAS CSCD 2022年第1期213-218,I0065,共7页
The mode selectivity of the H+CH_(3)D→H_(2)+CH_(2)D reaction was studied using a recently developed ten-dimensional time-dependent wave packet method.The reaction dynamics are studied for the reactant CH_(3)D initial... The mode selectivity of the H+CH_(3)D→H_(2)+CH_(2)D reaction was studied using a recently developed ten-dimensional time-dependent wave packet method.The reaction dynamics are studied for the reactant CH_(3)D initially from the ground state,the CH_(3) symmetry and asymmetry stretching excitation,the CD stretching excitation and the fundamental and the first overtone of the CH_(3) bending mode.The calculated reaction probabilities show that exciting either of the CH_(3) stretching modes enhances the reactivity in the collision energy range below 1.0 eV,while the CD stretching excitation does not obviously prompt the reaction.Fundamental CH_(3) bending excitation has nearly no effect on promoting reactivity.However,a significant enhancement is observed for the first overtone excitation of the CH_(3) bending mode,resulting from the Fermi resonance between the fundamental state of the CH_(3) symmetry stretching mode and the first overtone state of the CH_(3) bending mode. 展开更多
关键词 Quantum dynamics Mode selection Fermi resonance H+CH_(4)reaction Ten-dimensional model
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A SEMI-OPEN-LOOP CODING MODE SELECTION ALGORITHM BASED ON EFM AND SELECTED AMR-WB+ FEATURES
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作者 Hong Ying Zhao Shenghui Kuang Jingming 《Journal of Electronics(China)》 2009年第2期274-278,共5页
To solve the problems of the AMR-WB+(Extended Adaptive Multi-Rate-WideBand) semi-open-loop coding mode selection algorithm,features for ACELP(Algebraic Code Excited Linear Prediction) and TCX(Transform Coded eXcitatio... To solve the problems of the AMR-WB+(Extended Adaptive Multi-Rate-WideBand) semi-open-loop coding mode selection algorithm,features for ACELP(Algebraic Code Excited Linear Prediction) and TCX(Transform Coded eXcitation) classification are investigated.11 classifying features in the AMR-WB+ codec are selected and 2 novel classifying features,i.e.,EFM(Energy Flatness Measurement) and stdEFM(standard deviation of EFM),are proposed.Consequently,a novel semi-open-loop mode selection algorithm based on EFM and selected AMR-WB+ features is proposed.The results of classifying test and listening test show that the performance of the novel algorithm is much better than that of the AMR-WB+ semi-open-loop coding mode selection algorithm. 展开更多
关键词 Speech/Audio Semi-open-loop coding mode selection Features selection Energy Flat-ness Measurement(EFM)
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Benchmarking the Polyatomic Reaction Dynamics of X+Methane
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作者 Kopin Liu 《Chinese Journal of Chemical Physics》 SCIE CAS CSCD 2019年第1期1-10,I0001,共11页
With recent developments of sophisticated experimental techniques and advanced theoretical methods/computations, the field of chemical dynamics has reached the point that theoryexperiment comparisons can be made at a ... With recent developments of sophisticated experimental techniques and advanced theoretical methods/computations, the field of chemical dynamics has reached the point that theoryexperiment comparisons can be made at a quantitative level in very fine details for a prototypical A+BC system. As the system becomes larger, more degrees of freedom are involved and the complexity increases exponentially. At the same time, the multifaceted nature of polyatomic systems also opens up the possibilities for observing many new chemistry and novel phenomena|a land of opportunities. For the past 15 years or so my laboratory has delved into the reaction dynamics of methane+X (X: F, Cl, O(3P), and OH). This effort shifts the paradigm in the field of reaction dynamics by making the title reaction a benchmark polyatomic system. In this account, I shall disclose my thinking behind some of the key concepts and methods we introduced and how the unexpectedly discovered phenomena led to other uncharted territories. Those ndings not only enrich our understanding of the specific reactions we studied at the most fundamental level and inspire the theoretical developments, but also shape our thinking and lay the foundation for future explorations of different aspects of the multifaceted nature of polyatomic reactivity. 展开更多
关键词 Product pair correlation Mode and bond selectivity Velocity-map image
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Benzene selective hydrogenation over supported Ni(nano-) particles catalysts: Catalytic and kinetics studies
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作者 M.H.Peyrovi N.Parsafard Z.Mohammadian 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2018年第3期521-528,共8页
This report aims to reduce the benzene in a mixture of benzene and toluene as a model reaction using catalytic hydrogenation. In this research, we developed a series of catalysts with different supports such as Ni/HMS... This report aims to reduce the benzene in a mixture of benzene and toluene as a model reaction using catalytic hydrogenation. In this research, we developed a series of catalysts with different supports such as Ni/HMS, Ni/HZSM-5, Ni/HZSM5-HMS, Ni/Al2O3 and Ni/SiO2. Kinetic of this reaction was investigated under various hydrogen and benzene pressures. For more study, two kinetic models have also been selected and tested to describe the kinetics for this reaction. Both used models, the power law and Langmuir-Hinshelwood, provided a good fit toward the experimental data and allowed to determine the kinetic parameters. Among these catalysts, Ni/Al2O3 showed the maximum benzene conversion (99.19%) at 130℃ for benzene hydrogenation. The lowest toluene conversion was observed for Ni/SiO2. Furthermore, this catalyst presented high selectivity to benzene (75.26%) at 130℃. The catalytic performance (activity, selectivity and stability) and kinetics evaluations were shown that the Ni/SiO2 is an effective catalyst to hydrogenate benzene. It seems that the surface properties particularly pore size are effective parameter compared to other factors such as acidity and metal dispersion in this process. 展开更多
关键词 Catalytic hydrogenation Power law model Langmuir-Hinshelwood mode Selectivity Kinetics
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Wrinkling modes of graphene oxide assembled on curved surfaces
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作者 Kaiwen Li Zhanpo Han +11 位作者 Lidan Wang Jiaqing Wang Chuanwei Zhang Jiahao Lin Shiyu Luo Li Peng Wenzhang Fang Yingjun Liu Ziliang Wu Yeqiang Tan Chao Gao Zhen Xu 《Nano Research》 SCIE EI CSCD 2023年第2期1801-1809,共9页
Assembling two-dimensional(2D)sheets into macroscopic three-dimensional(3D)forms has created a promising material family with rich functionalities.Multiscale wrinkles are intrinsic features of 2D sheets in their 3D as... Assembling two-dimensional(2D)sheets into macroscopic three-dimensional(3D)forms has created a promising material family with rich functionalities.Multiscale wrinkles are intrinsic features of 2D sheets in their 3D assembles.Therefore,the precise wrinkling modulation optimizes the transition of outstanding properties of 2D sheets to expected performances of assembled materials and dominates their fabrication process.The wrinkling evolution of 2D sheets assembling onto flat surfaces has been extensively understood,however,the wrinkling behaviors on the more generally curved surface still remain unclear.Here,we investigate the wrinkling behaviors of graphene oxide sheets assembled onto curved surfaces and reveal the selection rule of wrinkling modes that determined by the curvature mismatch between 2D sheets and target surfaces.We uncover that three wrinkling modes including isotropic cracked land,labyrinth,and anisotropic curtain phases,respectively emerge on flat,spherical,and cylindrical surfaces.A favorable description paradigm is offered to quantitatively measure the complex wrinkling patterns and assess the curvature mismatch constraint underlying the wrinkling mode selection.This research provides a general and quantitative description framework of wrinkling modulation of 2D materials such as high performance graphene fibers,and guides the precise fabrication of particles and functional coatings. 展开更多
关键词 two-dimensional(2D)sheets three-dimensional(3D)assembles curved surfaces wrinkling modes selection curvature mismatch constraint wrinkling modulation
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A Ku-band magnetically insulated transmission line oscillator with overmoded slow-wave-structure
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作者 江涛 贺军涛 +2 位作者 张建德 李志强 令钧溥 《Chinese Physics B》 SCIE EI CAS CSCD 2016年第12期327-331,共5页
In order to enhance the power capacity, an improved Ku-band magnetically insulated transmission line oscillator (MILO) with overmoded slow-wave-structure (SWS) is proposed and investigated numerically and experime... In order to enhance the power capacity, an improved Ku-band magnetically insulated transmission line oscillator (MILO) with overmoded slow-wave-structure (SWS) is proposed and investigated numerically and experimentally. The analysis of the dispersion relationship and the resonant curve of the cold test indicate that the devine can operate at the near π mode of the TM01 mode, which is useful for mode selection and control. In the particle simulation, the improved Ku-band MILO generates a microwave with a power of 1.5 GW and a frequency of 12.3 GHz under an input voltage of 480 kV and input current of 42 kA. Finally, experimental investigation of the improved Ku-band MILO is carried out. A high-power microwave (HPM) with an average power of 800 MW, a frequency of 12.35 GHz, and pulse width of 35 ns is generated under a diode voltage of 500 kV and beam current of 43 kA. The consistency between the experimental and simulated far-field radiation pattern confirms that the operating mode of the improved Ku-band MILO is well controlled in zc mode of the TM01 mode. 展开更多
关键词 KU-BAND MILO HPM overmoded SWS mode selection particle simulation experimental in-vestigation
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Plasmon-assisted mode selection lasing in a lanthanide-based microcavity
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作者 Lei Guo Min Ji +6 位作者 Bowen Kang Min Zhang Xin Xie Zihao Wu Huan Chen Volker Deckert Zhenglong Zhang 《Advanced Photonics》 SCIE EI CAS CSCD 2024年第3期35-41,共7页
Lanthanide-based microlasers have attracted considerable attention owing to their large anti-Stokes shifts,multiple emission bands,and narrow linewidths.Various applications of microlasers,such as optical communicatio... Lanthanide-based microlasers have attracted considerable attention owing to their large anti-Stokes shifts,multiple emission bands,and narrow linewidths.Various applications of microlasers,such as optical communication,optical storage,and polarization imaging,require selecting the appropriate laser polarization mode and remote control of the laser properties.Here,we propose a unique plasmon-assisted method for the mode selection and remote control of microlasing using a lanthanide-based microcavity coupled with surface plasmon polaritons(SPPs)that propagate on a silver microplate.With this method,the transverse electrical(TE)mode of microlasers can be easily separated from the transverse magnetic(TM)mode.Because the SPPs excited on the silver microplate only support TM mode propagation,the reserved TE mode is resonance-enhanced in the microcavity and amplified by the local electromagnetic field.Meanwhile,lasingmode splitting can be observed under the near-field excitation of SPPs due to the coherent coupling between the microcavity and mirror microcavity modes.Benefiting from the long-distance propagation characteristics of tens of micrometers of SPPs on a silver microplate,remote excitation and control of upconversion microlasing can also be realized.These plasmon-assisted polarization mode-optional and remote-controllable upconversion microlasers have promising prospects in on-chip optoelectronic devices,encrypted optical information transmission,and high-precision sensors. 展开更多
关键词 lanthanide-based microlaser surface plasmon polaritons polarization mode selection
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Determination of hyperoside in rat plasma after intravenous administration by UPLC-MS
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作者 檀爱民 林萍 张斐 《Journal of Chinese Pharmaceutical Sciences》 CAS CSCD 2013年第6期516-520,共5页
Hyperoside is one of the major components of Hypericum perforatum L. and also present in many plant species such as Abelmoschus manihot (L.) Medik., Ribes nigrum L. and Rosa agrestis Savi (Rosaceae). Because hyper... Hyperoside is one of the major components of Hypericum perforatum L. and also present in many plant species such as Abelmoschus manihot (L.) Medik., Ribes nigrum L. and Rosa agrestis Savi (Rosaceae). Because hyperoside exhibits many biological activities, the pharmacokinetics profile of hyperoside needs to be studied for further elucidating its mechanism of action. A simple method for the determination of hyperoside in rat plasma was developed by using ultra-high performance liquid chromatography coupled with mass spectrometry (UPLC-MS). Only 50 ~tL plasma samples were required for sample preparation. The quantitative detection of hyperoside was accomplished by selected ion monitoring (SIM) in negative ion mode. Hyperoside was analyzed in less than 10 rain. Good linearity was obtained (r2〉0.999) and the intra- and inter-day precision of the method were lower than 15%. Lower limit of quantification (LLOQ) was 4 ng/mL for hyperoside in rat plasma. Our method showed advantage in the lower LLOQ compared with the reported method; furthermore, smaller amount of plasma was needed. The method was successfully applied for the pharmacokinetics study of hyperoside in rat after intravenous administration of hyperoside. 展开更多
关键词 HYPEROSIDE Selected ion monitoring mode Negative ion mode Pharmacokinetics profile
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Temperature-controlled mode selection of Er-doped random fiber laser with disordered Bragg gratings 被引量:4
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作者 W.L.Zhang Y.B.Song +3 位作者 X.P.Zeng R.Ma Z.J.Yang Y.J.Rao 《Photonics Research》 SCIE EI 2016年第3期102-105,共4页
In this paper, we proposed a way to realize an Er-doped random fiber laser(RFL) with a disordered fiber Bragg grating(FBG) array, as well as to control the lasing mode of the RFL by heating specific locations of the d... In this paper, we proposed a way to realize an Er-doped random fiber laser(RFL) with a disordered fiber Bragg grating(FBG) array, as well as to control the lasing mode of the RFL by heating specific locations of the disordered FBG array. The disordered FBG array performs as both the gain medium and random distributed reflectors, which together with a tunable point reflector form the RFL. Coherent multi-mode random lasing is obtained with a threshold of between 7.5 and 10 mW and a power efficiency between 23% and 27% when the reflectivity of the point reflector changes from 4% to 50%. To control the lasing mode of random emission, a specific point of the disordered FBG array is heated so as to shift the wavelength of the FBG(s) at this point away from the other FBGs.Thus, different resonance cavities are formed, and the lasing mode can be controlled by changing the location of the heating point. 展开更多
关键词 MODE Temperature-controlled mode selection of Er-doped random fiber laser with disordered Bragg gratings
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