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Ultrafast polarization optical switch constructed from one-dimensional photonic crystal and its performance analysis

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Chinese Science Bulletin 2009年第20期54卷 3663-3669页

作者： WANG Tao li qing GAO DingShan Wuhan National Laboratory for Optoelectronics College of Optoelectronic Science and Engineering Huazhong University of Science and Technology Wuhan 430074 China

All-optical switch with the ultrafast optical switching rate is a key device in the next generation optical *** this article,we propose a polarization switch with ps switching time,which is constructed from one-dimensional resonant photonic crystal(1D RPC).The model of switch operating at 1.5 μm is established based on the optical stark effect(OSE).We calculate the performance indices of the switch and the influences of errors of periods and refractive index on the performance characteristics.

关键词：一维光子晶体光开关性能分析超高速 Stark效应偏振下一代光网络开关速度

Formation Mechanism and Binding Energy for Body-Centred Regular Octahedral Structure of li7 Cluster

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Communications in Theoretical Physics 2007年第4X期48卷 717-720页

作者： MA Hai-Rong li Ping GOU qing-Quan li Hui-li Institute of Atomic and Molecular Physics Sichuan University Chengdu 610065 China

The formation mechanism for the body-centred regular octahedral structure of li7 cluster is proposed. The curve of the total energy versus the separation R between the nucleus at the centre and nuclei at the apexes for this structure of li7 has been calculated by using the method of Gou＇s modified arrangement channel quantum mechanics （MACQM）. The result shows that the curve has a minimal energy of-52.169 73 a.u. at R = 5.06ao. When R approaches infinity, the total energy of seven lithium atoms has the value of-51.996 21 a.u. So the binding energy of li7 with respect to seven lithium atoms is 0.173 52 a.u. Therefore the binding energy per atom for li7 is 0.024 79 a.u. or 0.674 eV, which is greater than the binding energy per atom of 0.453 eV for li2, the binding energy per atom of 0.494 eV for li3 and the binding energy per atom of 0.632 eV for li5 calculated previously by us. This means that the li7 cluster may be formed stably in a body-centred regular octahedral structure with a greater binding energy.

关键词： li7 cluster formation mechanism binding energy

Electrochemiluminescence of metal-organic complex nanowires based on graphene-Nafion modified electrode for biosensing application

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Science China Chemistry 2017年第5期60卷 642-648页

作者： qing li Caihong Kang Kunjie li Aibing Chen Wei Zhang Yong-Sheng Zhao College of Chemistry and Pharmaceutical Engineering Hebei University of Science and Technology Shijiazhuang 050018 China Key Laboratory of Photochemistry Institute of Chemistry Chinese Academy of Sciences Beijing 100190 China Hebei Key Laboratory of Molecular Chemistry for Drug Hebei University of Science and Technology Shijiazhuang 050018 China

In this work, we chose tris（2,2＇-bipyridyl）ruthenium（II）hexafluorophosphate （Ru（bpy）3（PF6）2）, a metal-organic complex material, to prepare nanowires, which were subsequently applied for the construction of electrochemiluminescence （ECL） biosensor by immobilizing them onto a glassy carbon electrode （GCE） with graphene-Nafion composite films. The graphene therein, being a two-dimensional carbon nanomaterial with outstanding electronic properties, can obviously improve the conductivity of the Nation film, as well as enhance the electrochemical signal and ECL intensity of the Ru（bpy）3（PF6）2 nanowires （RuNWs） at low graphene concentration. The developed biosensor exhibited excellent ECL stability with tripropylamine （TPrA） as co-reactant. The ECL biosensor exhibited high sensitive ECL response in a wide linear range and low detection limit for the detection of proline. It is considered that the oxidation products of proline would be responsible for the ECL enhancement. The large electro-active area of the nanowires and the enhancement effect of the graphene played critical roles in the high detection performance of the ECL biosensor. The results demonstrated herein may provide a useful enlightenment for the design of more sensitive ECL biosensors.

关键词： metal-organic nanowires electrochemilumincscence graphene bioscnsor

Development of small pixel HgCdTe infrared detectors

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Chinese Physics B 2019年第3期28卷 17-25页

作者： Ming liu Cong Wang li-qing Zhou North China Research Institute of Electroptics Beijing 100015China

After approximately half a century of development, HgCdTe infrared detectors have become the first choice for high performance infrared detectors, which are widely used in various industry sectors, including military tracking, military reconnaissance, infrared guidance, infrared warning, weather forecasting, and resource detection. Further development in infrared applications requires future HgCdTe infrared detectors to exhibit features such as larger focal plane array format and thus higher imaging resolution. An effective approach to develop HgCdTe infrared detectors with a larger array format size is to develop the small pixel technology. In this article, we present a review on the developmental history and current status of small pixel technology for HgCdTe infrared detectors, as well as the main challenges and potential solutions in developing this technology. It is predicted that the pixel size of long-wave HgCdTe infrared detectors can be reduced to5 μm, while that of mid-wave HgCdTe infrared detectors can be reduced to 3 μm. Although significant progress has been made in this area, the development of small pixel technology for HgCdTe infrared detectors still faces significant challenges such as flip-chip bonding, interconnection, and charge processing capacity of readout circuits. Various approaches have been proposed to address these challenges, including three-dimensional stacking integration and readout circuits based on microelectromechanical systems.

关键词： HgCdTe infrared detector small size pixel readout circuit

RNA interference-mediated silencing of a Halloween gene spookier affects nymph performance in the small brown planthopper Laodelphax striatellus

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Insect Science 2015年第2期22卷 191-202页

作者： Shuang Jia Pin-Jun Wan li-Tao Zhou li-li Mu Guo-qing li Education Ministry Key Laboratory of Integrated Management of Crop Diseases and Pests College of Plant Protection Nanjing AgriculturalUniversity Nanjing China

Post-embryonic development of insects is highly dependent on ecdysteroid hormone 20-hydroxyecdysone. Halloween gene spookier （spok, cyp307a2） has been documented to be involved in ecdysteroidogenesis in Drosophila melanogaster and Bombyx mori. We describe here the cloning and characterization of Halloween gene spookier （Lsspok, Lscyp307a2） in the small brown planthopper Laodelphax striatellus, a hemipteran insect species. LsSPOK has three insect-conserved P450 motifs, that is, Helix-K, PERF motif and heme-binding domain. Temporal and spatial expression patterns of Lsspok were evaluated by quantitative polymerase chain reaction. Through the fouth- instar and the early fifth-instar stages, Lsspok showed two expression peaks in the second- and fifth-day fourth-instar nymphs, and two troughs in the first-day fourth and fifth in- stars. On day 5 of the fourth-instar nymphs, Lsspok clearly had a high transcript level in the thorax where prothoracic glands were located. Dietary introduction of double-stranded RNA of Lsspok in the nymph stage successfully knocked down the target gene, decreased expression level ofecdysone receptor （LsEcR） gene, caused nymphal lethality and delayed development. Ingestion of 20-hydroxyecdysone in Lsspok-dsRNA-exposed nymphs did not increase Lsspok expression level, but almost completely rescued the LsEcR mRNA level and relieved the negative effects on survival and development. Thus, our data suggest that the ecdysteroidogenic pathway is conserved in insects and LsSPOK is responsible for specific steps in ecdysteroidogenesis in L. striatellus.

关键词： development double-stranded RNA ecdysteroidogenesis Laodelphaxstriatellus lethality spookier

Dt1-SWEET10a partner:Photoperiodic control of seed weight in soybean

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Molecular Plant 2024年第6期17卷 839-841页

作者： li-qing Chen Lalit Dev Tiwari Department of Plant Biology University of Illinois at Urbana-ChampaignUrbanaIL 61801USA DOE Center for Advanced Bioenergy and Bioproducts Innovation University of Illinois at Urbana-ChampaignUrbanaIL 61801USA Institute for Sustainability Energyand EnvironmentUniversity of Illinois at Urbana-ChampaignUrbanaIL 61801USA

Seed weight and size are critical agronomic traits essential for determining yield and composition,receiving significant attention throughout domestication(Meyer et al.,2012).Seed weight serves as a reliable indicator of average seed size due to their positive *** of seed weight involves both developmental and environmental cues,affecting cell proliferation or expansion(li et al.,2019).

关键词： soybean SWEET1 weight

Design and Synthesis of Photoaffinity Probe Candidates for the GABA-gated Chloride Channel

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Chinese Journal of Chemistry 2006年第10期24卷 1435-1438页

作者：刘尚钟 li qing-X. Department of Applied Chemistry China Agricultural University Beijing 100094 China Department of Molecular Biosciences and Bioengineering University of Hawaii at Manoa Honolulu Hawaii 96822 USA

In order to characterize binding sites of insecticidal compounds on GABA gated chloride channel, new photoaffinity probe candidates based on 5e-t-butyl-2e-[4-（substituted-propynyl）phenyl]-1,3-dithiane for the noncompetitive blocker （NCB） site of the γ-aminobutyric acid （GABA）-gated chloride channel were designed and synthesized, and their potency as an inhibitor on NCB was measured by 4＇-ethynyl-4-n-[2,3-^3H2]-propylbicycloorthobenzoate （^3H EBOB） assay. The synthesized compounds showed high inhibition activities with half maximum inhibition concentrations （IC50） of lower than 35 nmol/L and were very stable in binding conditions as well photoreacted quickly at 300 nm light. These new compounds are expected to be good photoaffinity labeling probes if radioisotope iodine is incorporated.

关键词： photoaffinity labeling GABA receptor 1,3-dithiane

Forming-free flexible memristor with multilevel storage for neuromorphic computing by full PVD technique

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Journal of Materials Science & Technology 2021年第1期60卷 21-26页

作者： Tian-Yu Wang Jia-lin Meng qing-Xuan li lin Chen Hao Zhu qing-qing Sun Shi-Jin Ding David Wei Zhang State Key Laboratory of ASIC and System School of MicroelectronicsFudan UniversityShanghai 200433China

Flexible resistive random access memory(RRAM) has shown great potential in wearable *** tunable multilevel resistance states,flexible memristors could be used to mimic the bio-synapses for constructing high-efficient wearable neuromorphic computing ***,the flexible substrate has intrinsic disadvantages including low-tempe rature tolerance and poor complementary metal-oxidesemiconductor(CMOS) compatibility,which limit the development of flexible *** physical vapor deposition(PVD) fabrication process could prepare RRAM without requirement of further treatment,which greatly simplified preparation steps and reduced the production *** the other hand,forming process,as a common pre-programing operation in RRAM,increases the energy consumption and limits the application scenarios of ***,a NiO-based forming-free RRAM with low set voltage was fabricated via full PVD *** flexible device exhibited reliable re sistive switching characteristics under flat state even compre s sive and tensile states(R=10 mm).The tunable multilevel resistance states(5 levels) could be obtained by controlling the compliance ***,synaptic plasticities also were verified in this *** flexible NiO-based RRAM shows great potential in wearable forming-free multibit memo ry and neuromorphic computing electronics.

关键词： Full PVD process Flexible memristor Forming-free Multilevel storage Neuromorphic application

Observation of Electron Fishbone-like Instabilities in EAST Heavy Impurity Ohmic Plasma

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Chinese Physics Letters 2013年第7期30卷 124-126页

作者： XU li-qing HU li-Qun EAST team Institute of Plasma Physics Chinese Academy of SciencesHefei 230031

The transient burst of an internal kink mode is first observed in EAST heavy impurity ohmic *** features of the electron fishbone-like mode are presented,and the fishbone-like instabilities are found to be driven by the trapped supra-thermal *** processional frequency of the trapped supra-thermal electrons is calculated with different discharge *** results indicate that the calculated processional frequency is consistent with the experimental ***,we also find that the frequency chirping of the long-lived mode is related to the evolution of the safety factor profile.

关键词： parameters. profile. Electron