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A COUPLING MODEL OF WATER FLOWS AND GAS FLOWS IN EXHAUSTED GAS BUBBLE ON MISSILE LAUNCHED UNDERWATER

Journal of Hydrodynamics 2007年第4期19卷 403-411页

作者： CHENG Yong-sheng liu hua Department of Engineering Mechanics Shanghai Jiaotong University Shanghai 200030 China

The gas and water flows during an underwater missile launch are numerically studied. For the gas flow, the explicit difference scheme of Non-oscillation and Non-free-parameter Dissipation (NND) is utilized to solve the Euler equations for compressible fluids in the body-fitted coordinates. For the water flow, the Hess-Smith method is employed to solve the Laplace equation for the velocity potential of irrotational water flows based on the potential theory and the boundary element method. The hybrid Eulerian-Lagrangian formulation for the free boundary conditions is used to compute the changes of the free surface of the exhausted gas bubble in time stepping. On the free surface of the exhausted gas bubble, the matched conditions of both the normal velocities and pressures are satisfied. From the numerical simulation, it is found that the exhausted gas bubble grows more rapidly in the axial direction than in the radial direction and the bubble will shrink at its "neck" finally. Numerical results of the movement of the shock wave and the distribution of the Mach number and the gas pressure within the bubble were presented, which reveals that at some time, the gas flow in the Laval nozzle is subsonic and the gas pressure in the nozzle is very high. Influences of various initial missile velocities and chamber total pressures and water depths on both the time interval when the gas flow in the nozzle is subsonic and the peak of the gas pressure at the nozzle end were discussed. It was suggested that a reasonable adjustment of the chamber total pressure can improve the performance of the engine during the underwater launch of missiles.

关键词： exhausted gas bubble Laval nozzle missile launched underwater shock wave gas jet

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Mononuclear aggregation-induced emission (AIE)-active gold(Ⅰ)-isocyanide phosphors: Contrasting phosphorescent mechanochromisms and effect of halogen substitutions on room-temperature phosphorescence nature

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Chinese Chemical Letters 2022年第5期33卷 2522-2526页

作者： Xiaoyan Wang Zhao Chen Jun Yin sheng hua liu Key Laboratory of Pesticide and Chemical Biology Ministry of EducationCollege of ChemistryCentral China Normal UniversityWuhan 430079China Jiangxi Key Laboratory of Organic Chemistry Jiangxi Science and Technology Normal UniversityNanchang 330013China State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China

Developing phosphors with long-lifetime(millisecond scale or even longer) solid state room temperature phosphorescence(RTP) feature has attracted considerable attention. However, to date, stimuli-responsive phosphors with RTP nature are still rare due to the absence of effective guidelines for the exploitation of luminophors synchronously possessing stimuli-responsive and RTP characteristics. In this work,a series of mononuclear gold(Ⅰ) complexes are reported. All these complexes exhibit various solid-state RTP properties, and phosphor 1-Cl exhibits long-lived RTP behavior. The effect of halogen atoms on the RTP nature of these complexes is investigated in detail. Furthermore, the introduction of different types of halogen atoms can effectively regulate the phosphorescent mechanochromism phenomena of these gold(Ⅰ)-containing complexes. In addition, these phosphors display typical aggregation-induced emission(AIE) effect except for phosphor 5-CCl, which lacks hydrogen-bonding interactions compared with the other four phosphors. This work will be very helpful to the development of mechanical-force-responsive AIE phosphors with lasting RTP.

关键词： Gold(I)complexes Halogen atoms Room temperature phosphorescence Aggregation-induced emission Phosphorescent mechanochromism

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The regulation of biothiol-responsive performance and bioimaging application of benzo[c][1,2,5]oxadiazole dyes

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Chinese Chemical Letters 2020年第11期31卷 2891-2896页

作者： Dongyang Li Weijie Chen sheng hua liu Xiaoqiang Chen Jun Yin Key Laboratory of Pesticide and Chemical Biology.Ministry of Education Hubei International Scientific and Technological Cooperation Base of Pesticide and Green SynthesisInternational Joint Research Center for Intelligent Biosensing Technology and HealthCollege of ChemistryCentral China Normal UniversityWuhan 430079China State Key Laboratory of Materials-Oriented Chemical Engineering College of Chemical EngineeringJiangsu National Synergetic Innovation Center for Advanced Materials(SICAM)Nanjing Tech UniversityNanjing 211816China

The different oxidation states of sulphur atom play a significant role on functional *** this work,a aryl-thioether and its sulphone substituted benzo[c][1,2,5]oxadiazole dyes were synthesized and utilized to determine thiol-containing amino *** result of selectivity experiments showed they detected the cysteine and homocysteine under physiological condition with negligible interference from other amino *** comparison to the thioether dye,the sulphone-based dye exhibited much faster response time for Cys and ***,the sulphone restricted its thiol-reactivity and bioimaging performance in living *** reducing the oxidation state of sulphur atom,we amazedly found that the sulfoxide-based dye still maintained high selectivity ultrafast response time for Cys/Hcy under physiological *** was worth mentioning that it also had high reactivity and good bioimaging performance that sulfone compounds did not have.

关键词： Benzo[c]oxadiazole dye Sulfoxide Sulphone Thiol response

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Light-and Heat-Controlled Formation of Osmanaphthalenes and Osmanaphthalynes

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Chinese Journal of Chemistry 2022年第24期40卷 2853-2860页

作者： Ming-Xing Zhang Xiaofei Yang Zhiqiang Xu Jun Yin sheng hua liu Key Laboratory of Pesticide and Chemical Biology Ministry of EducationCollege of ChemistryCentral China Normal UniversityWuhanHubei430079 China Hubei Key Laboratory of Purification and Application of Plant Anti-cancer Active Ingredients College of Chemistry and Life ScienceHubei University of EducationWuhanHubei430205 China Key Laboratory for Green Chemical Process of Ministry of Education School of Chemical Engineering and PharmacyWuhan Institute of TechnologyWuhanHubei430205 China

mple and efficient synthesis of metalla-aromatics with tailored distinctive optical,magnetic,redox,and light-emitting properties is attractive yet *** have now successfully synthesized three paramagnetic osmanaphthalenes bearing different electron-donating groups as well as the first osmabenzo[b]carbazole containing an osmanaphthalene unit with four fused rings in good yields by subjecting suitable osmium carbyne precursors to a visible-light-induced *** contrast,the four corresponding diamagnetic cyclic metal carbynes containing an osmanaphthalyne unit were obtained from the same osmium carbyne precursors by a heating *** lowest-energy absorptions of the paramagnetic osmanaphthalenes are red-shifted compared to the corresponding ***,experimental observations including X-ray analysis as well as nucleus-independent chemical shift(NICS),anisotropy of the current-induced density(AICD)calculations revealed these novel osmapolycycles bearing phosphonium substituents to be of aromatic character.

关键词： Metallacycles Aromaticity Osmanaphthalyne Osmanaphthalene Photolysis

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Cycloaddition reactions of benzyne with olefins

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Chinese Chemical Letters 2014年第12期25卷 1535-1539页

作者： Zhao Chen Xie Han Jin-hua Liang Jun Yin Guang-Ao Yu sheng-hua liu Key Laboratory of Pesticide and Chemical Biology Ministry of EducationCollege of ChemistryCentral China Normal University

Some novel cycloaddition reactions based on benzyne and olefins have been *** reactions were performed in the absence of a transition metal catalyst,and they displayed good *** cycloaddition reactions of benzyne with olefins provide effective routes for synthesizing benzocyclobutenes,biaryl compounds and 9,10-dihydrophenanthrene derivatives.

关键词： Cycloaddition Benzyne Olefins Benzocyclobutenes Biaryl 9 10-Dihydrophenanthrene

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Visible and near-infrared light activated azo dyes

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Chinese Chemical Letters 2021年第8期32卷 2359-2368页

作者： Huijuan Chen Weijie Chen Yan Lin Yuan Xie sheng hua liu Jun Yin Key Laboratory of Pesticide and Chemical Biology Ministry of EducationHubei International Scientific and Technological Cooperation Base of Pesticide and Green SynthesisInternational Joint Research Center for Intelligent Biosensing Technology and HealthCollege of ChemistryCentral China Normal UniversityWuhan 430079China Ministry of Education Key Laboratory for the Synthesis and Application of Organic Functional Molecules Hubei UniversityWuhan 430062China Guangdong Provincial Key Laboratory of Radioactive and Rare Resource Utilization Shaoguan 512026China Department of Pharmacy Jiangxi University of Traditional Chinese MedicineNanchang 330013China

The photoisomerization properties of azo derivatives have been widely used in the fields of materials and *** serious restriction to the development of functional azo-based materials is the necessity to trigger switching by UV light,which damage the corresponding surfaces and penetrate only partially through the ***,developing the visible and near-infrared light activated azo switches can solve this *** review provides a summary of molecular design strategies for driving the isomerization of azo derivatives with visible light and near-infrared light:(1) smart design directly excited by visible light,(2) the addition of upconversion nanoparticles,(3) the employment of twophoton absorption,(4) indirect excitation in combination with metal sensitizer.

关键词： Photochromism Azo dyes Visible light activation Near-infrared light activation

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Synthesis of Spirobenzopyrans Carrying a Monoaza-benzo-15-C-5 at the 8-position

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Chinese Chemical Letters 1998年第9期9卷 815-816页

作者： sheng hua liu Cheng Tai WU(Department of Chemistry, Wuhan University, Wuhan 430072) Wuhan Univ Dept Chem Wuhan 430072 Peoples R China

Synthesis of spirobenzopyrans bearing monoazacrown at the 8-position is described.

关键词： synthesis spirobenzopyran monoazacrown ester

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Fluorinated 1,8-naphthalimides:Synthesis,solid structure and properties

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Chinese Chemical Letters 2014年第10期25卷 1399-1402页

作者： Jie huang Di Wu Hao-Jie Ge sheng-hua liu Jun Yin Key Laboratory of Pesticide and Chemical Biology Ministry of EducationCollege of ChemistryCentral China Normal University

Three fluorinated 1,8-napthalimides were synthesized from *** structures were characterized by NMR and EI-MS *** structures of compounds 1b and 1c were also confirmed by X-ray diffraction analysis,which showed that they possessed different packing *** optoelectronic properties were *** results indicated that all of the naphthalimides possess good solubility and low LUMO energy level,which make them good solution processing candidates in n-type semiconductor.

关键词： Napthalimide n-Type semiconductor Optoelectronic properties

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Stimuli-responsive organic chromic materials with near-infrared emission

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Chinese Chemical Letters 2018年第10期29卷 1429-1435页

作者： Weijie Chen Yingle Pan Jianhua Chen Fengying Ye sheng hua liu Jun Yin Key Laboratory of Pesticide and Chemical Biology Ministry of EducationCollege of ChemistryCentral China Normal University

Organic chromic materials that respond to external stimuli, especially in the solid state, have sparked extensive interest owing to their potential use as smart materials. In particular, the availability of chromic materials, which emit fluorescence or phosphorescence in the deep penetrating, near-infrared（NIR）region, has led to great improvements in imaging. Various methods that were commonly applied to construct chromic materials, have been reformed to develop the novel type of compounds, and some have received rewards with excellent fingdings. Relevant research achievements of practical applications have showed their potential with the changes that locate in the NIR region, while further in-depth explorations about the inherent chromic chromism are underway. In this review, several representative studies, which have led the development of responsive organic chromic materials with near-infrared emission, will be discussed.

关键词： Stimuli-response Near-infrared emission Fluorescent dyes Chromic materials Mechanochromism

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Construction of Crown Ether-Stoppering [3]Rotaxanes Based on N-Hetero Crown Ether Host

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Chinese Journal of Chemistry 2017年第7期35卷 1050-1056页

作者： Xie Han Ziyong Li Zhiqiang Xu Zhiyong Zhao sheng hua liu Jun Yin Key Laboratory of Pesticide and Chemical Biology Ministry of Education College of Chemistry Central China Normal University Wuhan Hubei 430079 China College of Chemical Engineering and Technology Wuhan University of Science and Technology Wuhan Hubei 430081 China College of Food and Drug Luoyang Normal University Luoyang Henan 471022 China

Crown ether usually plays the role of macrocyclic host in supramolecular chemistry, but here the crown ether is also utilized as the stoppers in rotaxanes. In this work, we designed and synthesized two [3]rotaxanes containing four crown ether components by using an approach of template-directed clipping reaction, of which, two crown ether components were employed as the macrocyclic hosts to assemble the mechanically interlocked framework while another two crown ether units located on the two ends of ammonium template acting as the stoppering groups of rotaxanes. Their self-assembling process was monitored by the 1H NMR and one of the single crystal structures of [3]rotaxane was obtained.

关键词： crown ether rotaxane clipping reaction

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