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Physical and computational study of a novel submerged entry nozzle design for twin-roll casting process

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Journal of Iron and Steel Research International 2021年第11期28卷 1390-1399页

作者： Mian-guang Xu Miao-yong Zhu School of Mechanical Engineering Shandong University of TechnologyZibo 255000ShandongChina School of Metallurgy Northeastern UniversityShenyang 100819LiaoningChina

With significant emphasis on reducing the turbulence in the bath and the need for effective distribution of metal along the roller length in twin-roll casting,a novel submerged entry nozzle(SEN)configuration with two“gap regions”was ***“gap regions”of the new SEN divide the bath into two parts,the“upper melt bath”(casting region)and the“lower melt bath”(rolling region).The newly designed SEN was tested by using both full-scale water modeling experiments and numerical *** demonstrated that the turbulence could only be found near the rotating roller ***“gap regions”can make the near-wall flows more *** can also prevent the instabilities in the“upper melt bath”to be transferred to the“lower melt bath”,thus improving the stability of the ***,the novel SEN can stabilize the meniscus where the initial solidification *** is achieved by increasing the SEN immersion depth,which in turn,can enlarge the volume of the upper part of the bath.

关键词： Twin-roll casting Submerged entry nozzle Water model Numerical simulation

Two-Photon-Absorption Induced Superradiance of a New Organic Dye PSPS

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Chinese Physics Letters 2002年第5期19卷 739-741页

作者： Zhou guang-yong, Wang Dong State Key Laboratory of Crystal Materials Institute of Crystal Materials Shandong University Ji\'nan 250100

The linear and nonlinear optical properties of a new two-photon absorption (TPA) dye, trans-4-(4'-pyrrolidinyl styryl)-N-methyl pyridinium methyl sulfate (abbreviated as PSPS) is reported. Intense red superradiance with a peak located at 625nm can be observed from PSPS solution in benzyl alcohol when pumped by a focused picosecond laser beam operated at 1064nm. The lifetimes of one-photon absorption (OPA) and TPA fluorescence were measured to be 370 and 384ps, respectively. The pulse widths of OPA and TPA superradiance were 60 and 58 ps, respectively. The highest net upconversion efficiency from the absorbed pump laser to the upconverted superradiance is 8.3% at the pump energy of 0.6 mJ.

关键词： Two photon processes

Two-Photon Absorption-Induced Emission Properties of Dye HMASPS Doped Polymer

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Chinese Physics Letters 2002年第2期19卷 208-210页

作者： Wang Dong, Zhou guang-yong State Key Laboratory of Crystal Materials Shandong University Ji\'nan 250100

The 0.01M two-photon absorption dye trans-4-[p-(N-hydroxyethyl-N-methylamino)styryl]-N-methyl-pyridinium p-toluene sulfonate (HMASPS) doped polymer has been prepared. When pumped by the picosecond pulse from the pulsed mode-locked Nd:YAG laser, the polymer emits more intense upconverted fluorescence and superradiance compared to the solution sample of the dye. The two-photon pumped lasing with oscillating pulses has also been obtained. Compared to the dye in its solution state, the emission spectra of the polymer are all blueshifted. The polymer has a long upconverted fluorescent lifetime of about 4.041±0.04 ns.

关键词： Photons

Advances in Treatment of Post-Traumatic Stress Disorder with Chinese Medicine

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Chinese Journal of Integrative Medicine 2021年第11期27卷 874-880页

作者： HU guang-tao WANG yong Department of Psychological Medicine Army 958th HospitalChongqing400039China Department of Traditional Chinese Medicine Southwest HospitalArmy Medical UniversityChongqing400038China

“Timely,near,and expectation”is the main principle of battlefield rescue for military combat stress reaction(CSR).Post-traumatic stress disorder(PTSD)is the most common form of CSR and a long-term persistent mental disorder that is caused by unusual threatening or catastrophic psychological *** medicine(CM)has abundant resources,is simple,easy to master,with few side *** article summarizes the cellular and animal experimental mechanisms of CM treatment on PTSD,suggesting that traditional Chinese herbs and acupuncture can protect brain functional areas,and adjust hypothalamus-pituitary-adrenal *** Chinese herbs and acupuncture have shown good anti-stress efficacy and fewer side effects in clinical application,which may improve the CSR in the battlefield.

关键词： combat stress reaction post-traumatic stress disorder Chinese medicine acupuncture treatment

SIMULATION OF HYDRAULIC TRANSIENTS IN HYDROPOWER SYSTEMS USING THE 1-D-3-D COUPLING APPROACH

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Journal of Hydrodynamics 2012年第4期24卷 595-604页

作者： ZHANG Xiao-xi CHENG yong-guang State Key Laboratory of Water Resources and Hydropower Engineering Science Wuhan UniversityWuhan 430072China

Although the hydraulic transients in pipe systems are usually simulated by using a one-dimensional （l-D） approach, local three-dimensional （3-D） simulations are necessary because of obvious 3-D flow features in some local regions of the hydropower systems. This paper combines the 1-D method with a 3-D fluid flow model to simulate the Multi-Dimensional （MD） hydraulic transients in hydropower systems and proposes two methods for modeling the compressible water with the correct wave speed, and two strategies for efficiently coupling the 1-D and 3-D computational domains. The methods are validated by simulating the water hammer waves and the oscillations of the water level in a surge tank, and comparing the results ~with the 1-D solution data. An MD study is conducted for the transient flows in a realistic water conveying system that consists of a draft tube, a tailrace surge tank and a tailrace tunnel. It is shown that the 1-D-3-D coupling approach is an efficient and promising way to simulate the hydraulic transients in the hydropower systems in which the interactions between 1-D hydraulic fluctuations of the pipeline systems and the local 3-D flow patterns should be considered.

关键词： hydropower station hydraulic transients compressible water model coupling of 1-D and 3-D methods

A Brief Introduction to Organic Electrodeposition and a Review of the Fabrication of OLEDs based on Electrodeposition Technology

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Chinese Journal of Polymer Science 2023年第5期41卷 621-639,I0005页

作者： Bo-Han Wang Yu-guang Ma yong Cao Institute of Polymer Optoelectronic Materials and Devices State Key Laboratory of Luminescent Materials and DevicesSouth China University of TechnologyGuangzhou 510640China

Electrodeposition is an old and effective method for the fabrication of organic *** electrodeposited organic films have been widely used in various applications,highly luminescent films have been a great challenge because the electrochemically doped state may strongly quench the *** the first part of this review,the organic electrodeposition techniques,along with general electropolymerization and other special electrodepositions are *** the second part of the review,we describe how to electrochemically fabricate luminescent films for organic light-emitting diodes(OLEDs).With the rational molecular design and well-controlled electrodeposition process,we have not only demonstrated high-performance OLEDs,but also paved a promising way to practice active-matrix OLEDs(AMOLEDs)and super-resolution *** particular,RGB 3×3 array OLEDs based on active-matrix substrates,RGB passive-matrix OLEDs(PMOLEDs)with a resolution of 210 ppi,and monochromatic OLEDs with a super-resolution of 2822 ppi have been successfully *** is highly anticipated that the organic electrodeposition technology is of comparable or perhaps even higher contenders in manufacturing and downscaling OLEDs and AMOLEDs with low-cost and high-resolution for the human-computer interaction fields such as augmented reality(AR),virtual reality(VR),etc.

关键词： Electrochemistry Organic electrodeposition Electropolymerization Luminescent films OLEDs

Zero-bit watermarking resisting geometric attacks based on composite-chaos optimized SVR model

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The Journal of China Universities of Posts and Telecommunications 2011年第2期18卷 94-101页

作者： GAO guang-yong JIANG Guo-ping Center for Control & Intelligence Technology Nanjing University of Posts and Telecommunications Nanjing 210003 China School of Information Science & Technology Jiujiang University Jiujiang 332005 China

The problem to improve the performance of resisting geometric attacks in digital watermarking is addressed in this *** on the optimized support vector regression（SVR）,a zero-bit watermarking algorithm is *** proposed algorithm encrypts the watermarking image by using composite chaos with large key space and capacity against prediction,which can strengthen the safety of the proposed *** using the relationship between Tchebichef moment invariants of detected image and watermarking characteristics,the SVR training model optimized by composite chaos enhances the ability of resisting geometric *** analysis and simulations demonstrate that the proposed algorithm herein possesses better security and stronger robustness than some similar methods.

关键词： Tchebicbef moment invariants composite chaos SVR zero-bit watermarking

Dynamics,topology and bifurcations of McMullen maps

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Applied Mathematics(A Journal of Chinese Universities) 2013年第4期28卷 494-504页

作者： WANG Xiao-guang YIN yong-cheng Department of Mathematics Zhejiang University

We give a survey of many diff erent topological structure arise in the dynamical and parameter planes of McMullen maps.

关键词： Fatou set and Julia set McMullen map hyperbolic component Jordan curve

Performance Analysis of the Effects of Microgrooved Surface on A Marine Current Turbine with Underwater Mooring Platform

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China Ocean Engineering 2022年第5期36卷 755-766页

作者： DANG Zhi-gao MAO Zhao-yong SONG Bao-wei YANG guang-yong School of New Energy Nanjing University of Science and TechnologyJiangyin 214443China School of Marine Science and Technology Northwestern Polytechnical UniversityXi’an 710072China Key Laboratory for Unmanned Underwater Vehicle Northwestern Polytechnical UniversityXi’an 710072China Unmanned System Research Institute Northwestern Polytechnical UniversityXi’an 710072China

Marine current turbine(MCT),which is designed for the power supply of underwater mooring platform(UMP),is investigated in this *** reduce its flow noise,the microgrooved surface is applied at the suction surface of the turbine *** analyses of the effects of the UMP on MCT with microgrooved surface in different working conditions are *** transient turbulent flow field is obtained by incompressible large eddy simulation(LES),and then the Ffowcs Williams and Hawkings(FW-H)acoustic analogy is adopted to forecast the flow noise generated from the pressure fluctuations and loadings of the UMP shell and MCT blade *** numerical methods are first validated with experimental data and good agreements are ***,the influence of several key parameters on the performance of the MCT is then systematically studied,including interval distance,angle of pitch and angle of *** each case,the hydrodynamic parameters(thrust coefficient,torque coefficient and power coefficient),the vortical structures behind the model and the overall sound pressure level(OASPL)directionality are ***,the noise reduction effect of the microgrooved surface is also *** present investigation could provide an overall understanding for the performance of MCT combined with UMP.

关键词： marine current turbine underwater mooring platform microgrooved surface large eddy simulation flow noise