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实现超高速网络的光孤子通信技术:光弧子的原理和长距离传输实…
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作者 高学民 《文献快报(纤维光学与电线电缆)》 1994年第11期4-6,共3页
关键词 光孤子通信 光孤子 长矩离传输 超高速网络
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直读式电子压力计数据传输方案和实施 被引量:1
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作者 谢冬梅 冯贵洪 +1 位作者 王文青 田昆 《今日科苑》 2008年第18期59-59,共1页
本文从现有存储式电子压力计的技术现状出发,分析了在井下高温、高压、远距离条件下,实现压力、温度数据实时可靠采集、传输、分析的压力计——直读式电子压力计的数据传输方案和实施,并从技术需求分析、通讯方案选择、单芯远距离传输... 本文从现有存储式电子压力计的技术现状出发,分析了在井下高温、高压、远距离条件下,实现压力、温度数据实时可靠采集、传输、分析的压力计——直读式电子压力计的数据传输方案和实施,并从技术需求分析、通讯方案选择、单芯远距离传输、曼彻斯特码编解码的软硬件设计等方面,对直读式电子压力计数据传输方案进行了深入研究。试验数据分析结果表明,本文研究结果解决了直读式电子压力计的关键技术,增强了电子压力计在油田测井领域的市场竞争力。 展开更多
关键词 直读式电子压力计 单芯远距 离传输 曼彻斯特码 编码 解码
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A Multifunctional Chiral Metasurface with Asymmetric Transmission and Linear-Polarization Conversion
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作者 AFZAL Ahmed CAO Qunsheng MUHAMMAD Sajjad 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI CSCD 2024年第S01期21-26,共6页
In this paper,a multifunctional chiral metasurface is presented to achieve asymmetric transmission(AT)and linear-polarization conversion(LPC).The designed metasurface consists of a cross swords-like shape and two hole... In this paper,a multifunctional chiral metasurface is presented to achieve asymmetric transmission(AT)and linear-polarization conversion(LPC).The designed metasurface consists of a cross swords-like shape and two holes in the lower side of the unit cell.In the frequency band from 8.3 GHz to 10.4 GHz,AT is realized with more than 90%efficiency and the same chiral metasurface transforms linear polarized wave into its orthogonal counterpart with high efficiency.For LPC,the polarization conversion ratio(PCR)is greater than 95%.The proposed metasurface is stable against the incident angles of striking electromagnetic(EM)waves up to 60°for both operations of AT and LPC. 展开更多
关键词 chiral metasurface polarization conversion asymmetric tranmission plasmon resonances
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Investigating the charge transfer mechanism of ZnSe QD/COF S-scheme photocatalyst for H_(2)O_(2) production by using femtosecond transient absorption spectroscopy
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作者 Yanyan Zhao Chunyan Yang +4 位作者 Shumin Zhang Guotai Sun Bicheng Zhu Linxi Wang Jianjun Zhang 《Chinese Journal of Catalysis》 SCIE CAS CSCD 2024年第8期258-269,共12页
Hydrogen peroxide(H_(2)O_(2))has gained widespread attention as a versatile oxidant and a mild disin-fectant.Here,an electrostatic self-assembly method is applied to couple ZnSe quantum dots(QDs)with a flower-like cov... Hydrogen peroxide(H_(2)O_(2))has gained widespread attention as a versatile oxidant and a mild disin-fectant.Here,an electrostatic self-assembly method is applied to couple ZnSe quantum dots(QDs)with a flower-like covalent organic framework(COF)to form a step-scheme(S-scheme)photocata-lyst for H_(2)O_(2)production.The as-prepared S-scheme photocatalyst exhibits a broad light absorption range with an edge at 810 nm owing to the synergistic effect between the ZnSe QDs and COF.The S-scheme charge-carrier transfer mechanism is validated by performing Fermi level calculations and in-situ X-ray photoelectron and femtosecond transient absorption spectroscopies.Photolumi-nescence,time-resolved photoluminescence,photocurrent response,electrochemical impedance spectroscopy,and electron paramagnetic resonance results show that the S-scheme heterojunction not only promotes charge carrier separation but also boosts the redox ability,resulting in enhanced photocatalytic performance.Remarkably,a 10%-ZnSe QD/COF has excellent photocatalytic H_(2)O_(2)-production activity,and the optimal S-scheme composite with ethanol as the hole scavenger yields a H_(2)O_(2)-production rate of 1895 mol g^(-1)h^(-1).This study presents an example of a high-performance organic/inorganic S-scheme photocatalyst for H_(2)O_(2)production. 展开更多
关键词 ZnSe quantum dot Covalent organic framework S-scheme heterojunction Carrier migration and separation H_(2)O_(2) production
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Teleportation of an Arbitrary Three-Particle State via Three EPR Pairs 被引量:8
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作者 FANGJian-Xing ZHUShi-Qun CHENXian-Feng ZHANGRong 《Communications in Theoretical Physics》 SCIE CAS CSCD 2004年第3期369-372,共4页
A scheme of teleportation of an arbitrary three-particle state is presented when three pairs of entangled particles are used as quantum channels. After the Bell state measurements are operated by the sender, the origi... A scheme of teleportation of an arbitrary three-particle state is presented when three pairs of entangled particles are used as quantum channels. After the Bell state measurements are operated by the sender, the original state with deterministic probability can be reconstructed by the receiver when a corresponding unitary transformation is followed. 展开更多
关键词 TELEPORTATION arbitrary three-particle state three-entangled particle pairs unitary transformation
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Generalized Quantum Two-Qutrit-State Splitting 被引量:2
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作者 YUAN Hao LIU Yi-Min ZHANG Zhan-Jun 《Communications in Theoretical Physics》 SCIE CAS CSCD 2008年第10期873-878,共6页
A three-party scheme for splitting an arbitrary unknown two-qutrit state is proposed,where two non-maximally-entangled three-qutrit states are taken as the quantum channel among three parties.With the sender'shelp... A three-party scheme for splitting an arbitrary unknown two-qutrit state is proposed,where two non-maximally-entangled three-qutrit states are taken as the quantum channel among three parties.With the sender'shelp,if and only if both receivers collaborate together,they can securely share the quantum state in a probabilisticway by introducing an ancilla qutrit and performing appropriate unitary operations.The relation between the successprobability and coefficients characterizing the quantum channel is revealed.The security of the present scheme is analyzedand confirmed.Moreover,the generalization of the three-party scheme to more-party case is also sketched. 展开更多
关键词 generalized quantum state splitting partially entangled state generalized Bell-state measurement single-qutrit projective measurement
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A Reflectron Time-of-Flight Mass Spectrometer with a Nano-Electrospray Ionization Source for Study of Metal Cluster Compounds
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作者 吴小虎 谢华 +3 位作者 刘志凌 苏海峰 林水潮 唐紫超 《Chinese Journal of Chemical Physics》 SCIE CAS CSCD 2016年第4期401-406,I0001,共7页
An experiment facility has been set up for the study of metal cluster compounds in our laboratory, which consists of a nano-electrospray ionization source, an ion transmission and focus system, and a reflectron time-o... An experiment facility has been set up for the study of metal cluster compounds in our laboratory, which consists of a nano-electrospray ionization source, an ion transmission and focus system, and a reflectron time-of-fight mass spectrometer. Taking advantage of the nano-electrospray ionization source, polyvalent ions are usually produced in the "ionization" process and the obtained mass resolution of the equipment is over 8000. The molecular ion peaks of metal cluster compounds [Au20(PPhpy2)10Cl2](SbF6)4, where PPhpy2=bis(2- pyridyl)phenylphosphine, and [AuaAg2(C)L6](BF4)4, where L=2-(diphenylphosphino)-5- methylpyridine, are distinguished in the respective mass spectrum, accompanied by some fragment ion peaks. In addition, the mass-to-charge ratios of the parent ions are determi- nated. Preliminary results suggest that the device is a powerful tool for the study of metal cluster compounds. It turns out that the information obtained by the instrumentation serves as an essential supplement to single crystal X-ray diffraction for structure characterization of metal cluster compounds. 展开更多
关键词 Nano-electrospray ionization source Ion transmission and focus system Reflectron time-of-flight mass spectrometer Metal cluster compounds Single crystal X-ray diffraction
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Droplet transition for plasma-MIG welding on aluminium alloys 被引量:5
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作者 白岩 高洪明 邱灵 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2010年第12期2234-2239,共6页
The synchronous acquisition system of droplet image inspection and arc electric signals were established and the droplet transition characteristics of aluminum alloys were researched in the plasma-MIG welding process.... The synchronous acquisition system of droplet image inspection and arc electric signals were established and the droplet transition characteristics of aluminum alloys were researched in the plasma-MIG welding process.Typical droplet transition modes include globular transfer mode,short circuiting transfer mode,metastable spray transfer mode and projected transfer mode.The result indicates that MIG droplet transfer frequency and droplet transfer modes are changed by introducing the plasma arc in the plasma-MIG welding process compared with the MIG welding on the aluminum alloys,which broadens the range of welding parameters when the stable welding process proceeds.The metastable spray transfer and projected transfer mode are proved to be the most optimal modes by comparing the stability of electronic signal,droplet transition,weld appearance and weld penetration. 展开更多
关键词 plasma MIG welding droplet transition aluminum alloy high speed photography
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Enhanced photoelectrochemical water splitting using a cobalt-sulfide-decorated BiVO_(4) photoanode 被引量:2
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作者 Zhiming Zhou Jinjin Chen +2 位作者 Qinlong Wang Xingxing Jiang Yan Shen 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 2022年第2期433-441,共9页
Solar-driven water splitting is considered as a promising method to mitigate the energy crisis and various environmental issues.Bismuth vanadate(BiVO_(4))is photoanode material with tremendous potential for photoelect... Solar-driven water splitting is considered as a promising method to mitigate the energy crisis and various environmental issues.Bismuth vanadate(BiVO_(4))is photoanode material with tremendous potential for photoelectrochemical(PEC)water splitting.However,its PEC performance is severely hindered owing to poor surface charge transfer,surface recombination at the photoanode/electrolyte junction,and sluggish oxygen evolution reaction(OER)kinetics.In this regard,a novel solution was developed in this study to address these issues by decorating the surface of BiVO_(4)with cobalt sulfide,whose attractive features such as low cost,high conductivity,and rapid charge-transfer ability assisted in improving the PEC activity of the BiVO_(4)photoanode.The fabricated photoanode exhibited a significantly enhanced photocurrent density of 3.2 m A cm^(-2)under illumination at 1.23 V vs.a reversible hydrogen electrode,which is more than 2.5 times greater than that of pristine BiVO_(4).Moreover,the Co S/BiVO_(4)photoanode also exhibited considerable improvements in the charge injection yield(75.8%vs.36.7%for the bare BiVO_(4)film)and charge separation efficiency(79.8%vs.66.8%for the pristine BiVO_(4)film).These dramatic enhancements were primarily ascribed to rapid charge-transport kinetics and efficient reduction of the anodic overpotential for oxygen evolution enabled by the surface modification of BiVO_(4)by Co S.This study provides valuable suggestions for designing efficient photocatalysts via surface modification to improve the PEC performance. 展开更多
关键词 Photoelectrochemical water splitting Bismuth vanadate Cobalt sulfide Charge separation and transfer PHOTOANODE
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Teleportation of Two-Mode Quantum State of Continuous Variables 被引量:1
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作者 SONGTong-Qiang 《Communications in Theoretical Physics》 SCIE CAS CSCD 2004年第3期362-364,共3页
Using two Einstein-Podolsky Rosen pair eigenstates |η) as quantum channels, we study the teleportationof two-mode quantum state of continuous variables.
关键词 TELEPORTATION EPR pair eigenstate generalized two-mode squeezed vacuum
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Influence of green tea polyphenols on mitochondrial permeability transition pore and Ca^2+ transport 被引量:1
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作者 沈生荣 于海宁 金超芳 《Journal of Zhejiang University Science》 CSCD 2002年第4期475-479,共5页
The authors investigated the influence of green tea polyphenols (GTPs) on the liver mitochondria permeability transition pore (PTP) opening through mitochondria swelling and change of mitochondria membrane potential. ... The authors investigated the influence of green tea polyphenols (GTPs) on the liver mitochondria permeability transition pore (PTP) opening through mitochondria swelling and change of mitochondria membrane potential. The data showed that GTPs had obvious protective effect on the Ca 2+-induced PTP opening in a dose-dependent manner detected by mitochondria swelling. The results were obtained by measuring the change of mitochondria membrane potential through Rh 123. Further experiments were conducted to examine the detailed influence of GTPs on Ca 2+import and export of mitochondria. The results showed that GTPs had remarkably inhibitory effect on the Ca 2+-induced Ca 2+ import in mitochondria; and that they could accelerate Ca 2+-release from mitochondria. Our data provide an alternate interpretation of the potent protective function of GTPs on cell against apoptosis. 展开更多
关键词 MITOCHONDRIA PTP green tea polyphenols mCICR Ca 2+ transport Mitochondria ΔΨ m
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Automated Phase-measuring Profilometry of 3-D Diffuse Objects Using a Single Phase Step Method 被引量:2
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作者 ZHAO Hong,SONG Yuanhe,CHEN Wenyi,TAN Yushan (Research Institute for Laser & Infrared Application, Xi’an Jiaotong University,Xi’an 710049,CHN) 《Semiconductor Photonics and Technology》 CAS 1998年第1期25-30,35,共7页
The technique of phase measuring profilometry using a single phase step method is proposed.This method can automatically obtain phase value at each pixel by using a discret cosine transform algorithm.The method is abl... The technique of phase measuring profilometry using a single phase step method is proposed.This method can automatically obtain phase value at each pixel by using a discret cosine transform algorithm.The method is able to automatically recognize any position between depression and elevation on an object surface.Theoretical analysis and experimental verification are presented. 展开更多
关键词 Discret Cosine Transform Noncontact Optical Measurement One Step Phase-shifting Phase-measuring 3-D Profilometry
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Crack branching mechanism of rock-like quasi-brittle materials under dynamic stress 被引量:12
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作者 唐春安 杨岳峰 《Journal of Central South University》 SCIE EI CAS 2012年第11期3273-3284,共12页
The cracking patterns of a thin sheet with a pre-existing crack subjected to dynamic loading are numerically simulated to investigate the mechanism of crack branching by using the FEM method.Six numerical models were ... The cracking patterns of a thin sheet with a pre-existing crack subjected to dynamic loading are numerically simulated to investigate the mechanism of crack branching by using the FEM method.Six numerical models were set up to study the effects of load,tensile strength and heterogeneity on crack branching.The crack propagation is affected by the applied loads,tensile strength and heterogeneity.Before crack branching,the crack propagates by some distance along the direction of the pre-existing crack.For the materials with low heterogeneity,the higher the applied stress level is and the lower the tensile strength of the material is,the shorter the propagation distance is.Moreover,the branching angle becomes larger and the number of branching cracks increases.In the case of the materials with high heterogeneity,a lot of disordered voids and microcracks randomly occur along the main crack,so the former law is not obvious.The numerical results not only are in good agreement with the experimental observations in laboratory,but also can be extended to heterogeneity media.The work can provide a good approach to model the cracking and fracturing of heterogeneous quasi-brittle materials,such as rock,under dynamic loading. 展开更多
关键词 crack propagation branching HETEROGENEITY Weibull distribution MICROCRACK ROCK
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Generation of a Four-Particle Cluster State and Perfect Teleportation of an Arbitrary Two-Particle State in an Ion-Trap System 被引量:1
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作者 WANG Xin-Wen YANG Guo-Jian 《Communications in Theoretical Physics》 SCIE CAS CSCD 2009年第10期588-592,共5页
We propose a scheme for generating a four-particle cluster state in an ion-trap system.The scheme isinsensitive to the thermal motion of the ions,and needs less operations than previous ones.With such a setup,we alsod... We propose a scheme for generating a four-particle cluster state in an ion-trap system.The scheme isinsensitive to the thermal motion of the ions,and needs less operations than previous ones.With such a setup,we alsodemonstrate a procedure for perfectly teleporting an arbitrary two-particle state via a single multipartite entanglementchannel,a four-particle cluster state. 展开更多
关键词 cluster state TELEPORTATION ION-TRAP
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Forecast correct model of overpressure attenuation during gas explosion in excavation roadway 被引量:3
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作者 YANG Ying-di ZHANG Guo-shu CHEN Cai-yun 《Journal of Coal Science & Engineering(China)》 2010年第3期267-271,共5页
Through analyzing experimental data of gas explosions in excavation roadwaysand the forecast models of the literature, Found that there is no direct proportional linearcorrelation between overpressure and the square r... Through analyzing experimental data of gas explosions in excavation roadwaysand the forecast models of the literature, Found that there is no direct proportional linearcorrelation between overpressure and the square root of the accumulated volume of gas,the square root of the propagation distance multiplicative inverse.Also, attenuation speedof the forecast model calculation is faster than that of experimental data.Based on theoriginal forecast models and experimental data, deduced the relation of factors by introducinga correlation coefficient with concrete volume and distance, which had been verifiedby the roadway experiment data.The results show that it is closer to the roadway experimentaldata and the overpressure amount increases first then decreases with thepropagation distance. 展开更多
关键词 excavation roadway gas explosion overpressure amount forecast model
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8×10 Gb/s transmission system over 2015 km with dispersion compensation by fiber Bragg Grating 被引量:1
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作者 CHEN Yong CAO Ji-hong +7 位作者 TAN Zhong-wei LIU Yan CHEN Ting MA Lina CHANG De-yuan NING Ti-gang PEI Li JIAN Shui-sheng 《Optoelectronics Letters》 EI 2005年第1期49-52,共4页
The cascaded chirp fiber Bragg gratings(CFBGs) with ITU-T standard wavelengths and wavelength grid are applied to compensate the dispersion of 8×10 Gb/s WDM system.The ASE of the EDFA could be reduced,the OSNR of... The cascaded chirp fiber Bragg gratings(CFBGs) with ITU-T standard wavelengths and wavelength grid are applied to compensate the dispersion of 8×10 Gb/s WDM system.The ASE of the EDFA could be reduced,the OSNR of the transmitted signal can be increased and the fluctuation of the EDFA gain can be restrained in a certain scope by the CFBG employed in the system.Experiment of error-free 8×10 Gb/s 2 015 km transmission without FEC and electric regeneration is demonstrated in this paper.In this system,only EDFA is used as amplifier,and no other form of dispersion compensator is adopted except CFBG.The experimental result showed that after 2015 km transmission,the consistency of the dispersion compensating for each channel is perfect. 展开更多
关键词 光纤 BRAGG光栅 离散补偿 波长 信号传输
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Performance and Optimization of 10 Gb/s Electroabsorption Modulator in Short Transmission
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作者 WANG An bin, WU Jian, LIN Jin tong (Optical Communication Center,Beijing University of Posts and Telecommunication,Beijing 100876,CHN) 《Semiconductor Photonics and Technology》 CAS 2003年第3期162-165,共4页
Transmission performance of electroabsorption modulator in 10 Gb/s transmission systems has been simulated and analyzed under the condition of taking into account the chirp,extinction ratio, transmissivity and rise/fa... Transmission performance of electroabsorption modulator in 10 Gb/s transmission systems has been simulated and analyzed under the condition of taking into account the chirp,extinction ratio, transmissivity and rise/fall time.Results show that short transmission distance without EDFA after EAM can be used in future metropolitan area network,but the transmissivity must be carefully considered. The sampling time range and decision level can be optimized to reduce the bit error ratio. 展开更多
关键词 Electroabsorption modulator TRANSMISSIVITY Sampling time Decision level
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Variations of Ion-Transport Enzyme Activities During Early Development of the Shrimps Fenneropenaeus chinensis and Marsupenaeus japonicus
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作者 PAN Luqing LI Li ZHANG Linjuan 《Journal of Ocean University of China》 SCIE CAS 2010年第1期76-80,共5页
The ion-transport enzyme activities were studied in the nauplii 1-2, zoea 1-3, mysis 1-3, and postlarva 1-7 of the shrimps Marsupenaeus japonicus and Fenneropenaeus chinensis. The results showed that total ATPase, Na... The ion-transport enzyme activities were studied in the nauplii 1-2, zoea 1-3, mysis 1-3, and postlarva 1-7 of the shrimps Marsupenaeus japonicus and Fenneropenaeus chinensis. The results showed that total ATPase, Na+-K+-ATPase, and V-ATPase (V-type H+-ATPase) activities increased during the early development for both the species, from zero in nauplii to stable levels after zoea stage. The enzyme activities of the latter species were significantly higher than those of the former species after zoea stage (F〉F0.05). The contributions of Na+-K+-ATPase, V-ATPase and HCO3--ATPase to the total ATPase activity of the two species varied in different developmental stages and accounted for 40%-70%, 22%-46% and 2%-13% in M. japonicus from zoea to postlarva stage, whilst the shares of them were 42%-69%, 28%-44% and 2.5%-22%, respectively in Echinensis. These findings suggest the possible culture of the two species with varying water quality, especially the salinity and pH. 展开更多
关键词 Fenneropenaeus chinensis Marsupenaeusjaponicus ion-transport enzyme activities NAUPLII ZOEA mysis postlarva development
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Scheme for N-Qubit Toffoli Gate by Transport of Trapped Ultracold Ions
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作者 YANG Wan-Li WEI Hua CHEN Chang-Yong 《Communications in Theoretical Physics》 SCIE CAS CSCD 2008年第11期1117-1122,共6页
We propose a potentially practical scheme for implementing an n-qubit Toffoli gate by elaborately controllingthe transport of ultracold ions through stationary laser beams.Conditioned on the uniform ionic transport ve... We propose a potentially practical scheme for implementing an n-qubit Toffoli gate by elaborately controllingthe transport of ultracold ions through stationary laser beams.Conditioned on the uniform ionic transport velocity,the n-qubit Toffoli gate can be realized with high fidelity and high successful probability under current experimentalconditions,which depends on a single resonant interaction with n trapped ions and has constant implementation timewith the increase of qubits.We show that the increase of the ion number can improve the fidelity and the successfulprobability of the Toffoli gate. 展开更多
关键词 Toffoli gate trapped ions
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Synchronization Stability in Weighted Complex Networks with Coupling Delays 被引量:1
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作者 WANG Qing-Yun DUAN Zhi-Sheng +1 位作者 CHEN Guan-Rong LU Qi-Shao 《Communications in Theoretical Physics》 SCIE CAS CSCD 2009年第4期684-690,共7页
Realistic networks display not only a complex topological structure, but also a heterogeneous distribution of weights in connection strengths. In addition, the information spreading through a complex network is often ... Realistic networks display not only a complex topological structure, but also a heterogeneous distribution of weights in connection strengths. In addition, the information spreading through a complex network is often associated with time delays due to the finite speed of signal transmission over a distance. Hence, the weighted complex network with coupling delays have meaningful implications in real world, and resultantly gains increasing attention in various fields of science and engineering. Based on the theory of asymptotic stability of linear time-delay systems, synchronization stability of the weighted complex dynamical network with coupling delays is investigated, and simple criteria are obtained for both delay-independent and delay-dependent stabilities of synchronization states. The obtained criteria in this paper encompass the established results in the literature as special cases. Some examples are given to illustrate the theoretical results. 展开更多
关键词 weighted complex networks coupling delays synchronization stability
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