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| 1 | Two-substrate vertical deposition for stable colloidal crystal chips显示文摘By combining vertical deposition with micro- molding in capillaries method, we have demonstrated the two-substrate vertical deposition, an alternative and versatile procedure for fabricating high-quality stable colloidal crystal chips. Apparent bright colors, special UV-vis spectra, scan- ning electron microscopy (SEM) and atomic force micros- copy (AFM) images all prove that high-quality colloidal crystal structures are formed in between the two substrates. During the two-substrate vertical deposition for colloidal crystal chips, capillary force and evaporation of the medium are critical to the formation of the colloidal crystals; while the confinement in between two close substrates makes the resulting colloidal crystal chips more stable. Due to the ex- cellent stability, these colloidal crystal chips can be used to construct some composite optical devices via a simpler and more flexible process. Meanwhile, they can also be further used as the templates for ordered multiporous materials. | CHENXin SUNZhiqiang CHENZhimin ZHANGKai YANGBai | 2005 | Chinese Science Bulletin2005，50，8： | 13 |
| 2 | RESEARCH ON CONTROL OF FLYWHEEL SUSPENDED BY ACTIVE MAGNETIC BEARING SYSTEM WITH SIGNIFICANT GYROSCOPIC EFFECTS显示文摘Traditional PID controllers are no longer suitable for magnetic-bearing-supported high-speed flywheels with significant gyroscopic effects.Because gyroscopic effects greatly influence the stability of the flywheel rotor,especially at high rotational speeds.Velocity cross feedback and displacement cross feedback are used to overcome harmful effects of nutation and precession modes, and stabilize the rotor at high rotational speeds.Theoretical analysis is given to show their effects.A control platform based on RTLinux and a PC is built to control the active magnetic bearing (AMB) system, and relevant results are reported.Using velocity cross feedback and displacement cross feedback in a closed loop control system, the flywheel successfully runs at over 20 000 r/min. | ZhangKai ZhaoLei ZhaoHongbin | 2004 | Chinese Journal of Mechanical Engineering2004，17，1： | 10 |
| 3 | A cylindrical rod ultrasonic motor with 1 mm diameter and its application in endo-scopic OCT显示文摘A tiny ultrasonic motor was constructed by using a piezoelectric ceramic cylindrical rod as a vibration generator of the stator. The fabricated tiny motor has a di- ameter of 1 mm, a length of 5 mm and a weight of 36 mg. The resonant frequency is 32 kHz with one fixed boundary or 83 kHz with two free boundaries. Four silver electrodes were deposited on the cylindrical surface. The spacing be- tween two adjacent electrodes was carefully designed. A method was developed for the polarization of the stator. By using the bending vibration mode of the stator, the motor shows a performance with a speed of 1800 rpm and a stalled torque of 4 μ Nm, and can bear a high driving voltage up to 350 Vpp. The motor was used to drive an optical prism for circular scanning in an endoscopic OCT system. The tomo- graphic images of the inner cavities of a plastic tube and a scallion were obtained, and the resolution was of the order of micrometer-scale. | ZHOUTieying ZHANGKai CHENYu WANGHuan WUJigang JIANGKaili XUEPing | 2005 | Chinese Science Bulletin2005，50，8： | 6 |
| 4 | An alternating direction method of multipliers for elliptic equation constrained optimization problem显示文摘We propose an alternating direction method of multipliers(ADMM)for solving the state constrained optimization problems governed by elliptic equations.The unconstrained as well as box-constrained cases of the Dirichlet boundary control,Robin boundary control,and right-hand side control problems are considered here.These continuous optimization problems are transformed into discrete optimization problems by the finite element method discretization,then are solved by ADMM.The ADMM is an efficient first order algorithm with global convergence,which combines the decomposability of dual ascent with the superior convergence properties of the method of multipliers.We shall present exhaustive convergence analysis of ADMM for these different type optimization problems.The numerical experiments are performed to verify the efficiency of the method. | ZHANGKai LI JingShi SONG YongCun WANG XiaoShen | 2017 | Science China Mathematics2017，60，2： | 4 |
| 5 | SurfactantintercaGlated,chemicallyreducedgrapheneoxideforhighperGformancesupercapacitorelectrodes显示文摘 | ZhangKai MaoLu ZhangLili etal | 2011 | JournalofMateGrialsChemistry2011，21，： | 1 |
| 6 | A CFD Model for Fluid Dynamics in a Gas-fluidised Bed显示文摘A modified particle bed model derived from the two-fluid momentum balance equations was employed to predict the gas-fluidised bed behaviour. Additional terms are included in both the fluid and the particle momentum balance equations to take into account the effect of the dispersed solid phase. This model has been extended to two-dimensional formulations and has been implemented in the commercial code CFX 4.3. The model correctly simulates the homogeneous fluidisation of Geldart Group A and the bubbling fluidisation of Geldart Group B in gas-solid fluidised beds. | ZHANGKai StefanoBrandani | 2004 | Chemical Research in Chinese Universities2004，20，4： | 1 |
| 7 | Marketability,control,and the pricing of block shares显示文摘 | Huang Zhangkai Xu Xingzhong | 2009 | Journal of Banking & Finance2009，33，1： | 1 |
| 8 | Giant enhancements of high-order upconversion luminescence enabled by multiresonant hyperbolic metamaterials显示文摘Photonic nanostructures with resonant modes that can generate large electric field(EF) enhancements are applied to enhance light-matter interactions in nanoscale, bringing about great advances in both fundamental and applied science. However, a small hot spot(i.e., the regions with strong EF enhancements) and highly inhomogeneous EF distribution of the resonant modes usually hinder the enhancements of light-matter interactions in a large spatial scale. Additionally, it is a severe challenge to simultaneously generate multiple resonant modes with strong EF enhancements in a broadband spectral range, which greatly limits the capacity of a photonic nanostructure in boosting optical responses including nonlinear conversion, photoluminescence, etc. In order to overcome these challenges, we presented an arrayed hyperbolic metamaterial(AHMM). This AHMM structure is applied to simultaneously enhance the three-photon and four-photon luminescence of upconversion nanoparticles. Excitingly, the enhancement of the three-photon process is 1 order of magnitude larger than previous records, and for the enhancing four-photon process, we achieve an enhancement of 3350 times, greatly beneficial for overcoming the crucial problem of low efficiency in near infrared light upconversion. Our results demonstrated a promising platform for realizing giant enhancements of light-matter interactions, holding potential in constructing various photonics applications such as the nonlinear light sources. | Haofei Xu Zhimin Zhu Jiancai Xue Qiuqiang Zhan Zhangkai Zhou Xuehua Wang | 2021 | Photonics Research2021，9，3： | 1 |
| 9 | Metal sulphide semiconductors forphotocatalytic hydrogen production显示文摘 | ZhangKai GuoLiejin | 2013 | Catallysis Science & Technology2013，3，： | 1 |
| 10 | CorrosionGreGsistingpropertiesofcarbonfiber 显示文摘 | ZhangKai MaYan YangShiquan etal | 2009 | ChemicalPropelGlants& PolymericMaterials2009，7，4： | 1 |
| 11 | 显示文摘 | ZHANGKai MAYan GUOJing etal(张凯 马艳 郭静 等) | | 红外技术0，，： | 1 |
| 12 | Experimental investigation of a gliding discharge plasma jet igniter显示文摘Relight of jet engines at high altitude is difficult due to the relatively low pressure and temperature of inlet air.The penetration of initial flame kernel affects the ignition probability in the turbine engine combustor greatly.In order to achieve successful ignition at high altitude,a deeper penetration of initial flame kernel should be generated.In this study,a Gliding Arc Plasma Jet Igniter(GAPJI)is designed to induce initial flame kernel with deeper penetration to achieve successful ignition at high altitude.The ignition performance of the GAPJI was demonstrated in a model combustor.It was found that GAPJI can generate plasma with deeper penetration up to 30.5 mm than spark igniter with 22.1 mm.The discharge power of GAPJI was positively correlated with flow rate of the carrier gas,approaching 200 W in average.Ignition experiments show that GAPJI has the advantage of extending the lean ignition limit.With GAPJI,the lean ignition limit of the combustor is 0.02 at 0 km,which is 55.6%less than that with spark igniter(0.045).The evolution of flame morphology was observed to explore the development of the flame kernel.It is shown that the advantage of a high penetration and continuous releasing energy can accelerate the ignition process and enhance combustion. | Min JIA Zhibo ZHANG Wei CUI Huimin SONG Zhangkai HUANG | 2022 | Chinese Journal of Aeronautics2022，35，6： | 1 |
| 13 | Characterizations of Skeletal Iron Catalysts Prepared from Rapidly and Naturally Quenched Fe-Al Alloys显示文摘Surface morphology, physical-chemical properties of skeletal iron catalysts prepared by leaching of the rapidly quenched(RQ) and naturally quenched(NQ) Fe-Al alloys with an aqueous solution of NaOH were characterized by using a series of techniques including XRD, BET, XPS, SEM, H2 and CO-TPD. It was found that the RQ skeletal iron catalyst exhibits a smaller particle size, larger specific surface area and pore volume than the NQ one. The H2 and CO-TPD experiments showed that the RQ skeletal iron exhibits stronger affinity for H2 and milder affinity for CO compared with the NQ one. But the NQ skeletal catalyst shows a better thermal stability than the RQ catalyst. | LUOGe YANShi-run QIAOMing-hua ZHANGKai HUHua-rong HEHe-yong FANKang-nian | 2004 | Chemical Research in Chinese Universities2004，20，4： | 0 |
| 14 | Hydrodynamic Behavior in a Tapered Bubble Column显示文摘The experiment was conducted to explore the hydrodynamics in a conical column with a height of 3.00 m, and a taper angle of 1.91°. Three regimes occur in succession with increasing superficial gas velocity. Overall gas holdup increases with an increase in gas velocity and a decrease in solid concentration or static slurry height. Axial solid holdup becomes more uniform with increasing gas velocity, while axial gas holdup decreases from the bottom to the top. Both dry and wet pressure drops across the gas distributor increase with an increase in superficial gas velocity. | ZHANGKai ZHAOYu-long ZHANGBi-jiang | 2004 | Chemical Research in Chinese Universities2004，20，4： | 0 |
| 15 | Microscopic pump-probe optical technique to characterize the defect of monolayer transition metal dichalcogenides显示文摘Monolayer transition metal dichalcogenides(TMDs)are ideal materials for atomically thin,flexible optoelec.tronic and catalytic devices.However,their optoelectrical performance such as quantum yield and carrier mobility often shows below theoretical expectations due to the existence of defects.For monolayer TMD-based devices,finding a low-cost,time-efficient, and nondestructive technique to visualize the change of defect distribution in the space domain and the defect-induced change of the carrier's lifetime is vital for optimizing their optoelectronic properties.Here, we propose a microscopic pump-probe technique to map the defect distribution of monolayer TMDs.It is found that there is a linear relationship between transient differential reflection intensity and defect density,suggesting that this technique not only realizes the visualization of the defect distribution but also achieves the quantitative estimation of defect density.Moreover,the carrier lifetime at each point can also be obtained by the technique. The technique used here provides a new route to characterize the defect of monolayer TMDs on the micro-zone, which will hopefiilly guide the fabrication of high-quality two-dimensional (2D) materials and the promotion of optoelectrical performance. | Ying Yu Xiankun Zhang Zhangkai Zhou Zheng Zhang Yanjun Bao Haofei Xu Limin Lin Yue Zhang Xuehua Wang | 2019 | Photonics Research2019，7，7： | 0 |
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