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Perfect optical nonreciprocity in a double-cavity optomechanical system

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Frontiers of physics 2019年第5期14卷 105-110页

作者： Xiao-Bo Yan he-lin Lu Feng Gao Liu Yang College of Electronic Science Northeast Petroleum UniversityDaqing 163318China Department of Physics Yunnan Minzu UniversityKunming 650500China College of Science Shenyang Aerospace UniversityShenyang 110136China College of Automation Harbin Engineering UniversityHarbin 150001China

Nonreciprocal devices are *** for building quantuin networks and ubiquitous in modern communication ***,we propose to take advantage of the interference between optome-chanical interaction and lincarly-couplcd interaction to realize optical nonreciprocal transmission in a double-cavity optomechanical ***,we have derived essential conditions for perfect optical nonrcciprocity ancl analysed properties of the optical nonreciprocal *** results can be used to control optical transmission in quantum information processing.

关键词： optoinechanics optical nonreciprocity nonreciprocal transmission

Cyclization and halogenation of substituted o-allylphenols with diacetoxyiodobenzene in the presence of iodine or bromine

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Chinese Chemical Letters 2008年第6期19卷 661-664页

作者： Qi Zhong Zhou Chun lin he Zhen Chu Chen Department of Chemistry Zhejiang University Hangzhou 310027 China

Substituted 2-halomethyl-2,3-dihydrobenzofurans were synthesized in one pot and in mild yield from substituted o-allylphenols with diacetoxyiodobenzene in the presence of 12 or Br2 in dry CH2Cl2 under reflux.

关键词： 2-Halomethyl-2,3-dihydrobcnzofuran Diacetoxyiodobenzene Cyclization Halogenation

Identification of the key chitinase genes in Tetranychus cinnabarinus (Boisduval) based on the expression and sequence characteristic analysis

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Journal of Integrative Agriculture 2017年第4期16卷 892-899页

作者： XU Hao-ran he lin XIAO Wei SheN Guang-mao Key Laboratory of Entomology and Pest Control Engineering College of Plant Protection Southwest University Chongqing 400715 P.R.China

Chitin is an important content in the exoskeletons of arthropods, and its hydrolyzation is catalyzed by chitinases during the process of molting, thus, the chitinases are considered as ideal target to interfere the growth of arthropods. This study intends to clarify the characteristic of the chitinases during the development of Tetranychus cinnabarinus, and screen out important genes as potential control targets. The results showed that the total enzyme concentration of chitinases was significantly higher in larva, the first and second nymph than that in egg and adult. Base on the transcriptome data, six unigenes encoding chitinases were identified and their expression patterns in different developmental stages were detected. The expressions of TcCHIT1 and TcCHITIO showed high abundance during the molting process and their expression change during the developmental stages was consistent with the enzyme concentration. The full-length of these two genes were further cloned, and the structural characteristics of their proteins were analyzed by constructing the three-dimensional structure model. The results provide basic information to understand the characteristic of chitinases in T. cinnabarinus and might be considered as target for control.

关键词： Tetranychus cinnabarinus chitinase gene expression protein structure

Andrographolide sensitizes prostate cancer cells to TRAIL-induced apoptosis

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Asian Journal of Andrology 2018年第2期20卷 200-204页

作者： Ruo-Jing Wei Xin-Shi Zhang Da-lin he Department of Urology The First Affiliated Hospital of Xi'an Jiaotong University Xi'an 710061 China

Tumor necrosis factor-related apoptosis-inducing ligand （TRAIL） is a promising agent for anticancer therapy. The identification of small molecules that can establish the sensitivity of prostate cancer （PCa） cells to TRAIL-induced apoptosis is crucial for the targeted treatment of PCa. PC3, DU145, JAC-1, TsuPrl, and LNCaP cells were treated with Andrographolide （Andro） and TRAIL, and the apoptosis was measured using the Annexin V/PI double staining method. Real time-polymerase chain reaction （PCR） and Western blot analysis were performed to measure the expression levels of target molecules. RNA interference technique was used to down-regulate the expression of the target protein. We established a nude mouse xenograft model of PCa, which was used to measure the caspase-3 activity in the tumor cells using flow cytometry. In this research study, our results demonstrated that Andro preferentially increased the sensitivity of PCa cells to TRAIL-induced apoptosis at subtoxic concentrations, and the regulation mechanism was related to the up-regulation of DR4. In addition, it also increased the p53 expression and led to the generation of reactive oxygen species （ROS） in the cells. Further research revealed that the DR4 inhibition, p53 expression, and ROS generation can significantly reduce the apoptosis induced by the combination of TRAIL and Andro in PCa cells. In conclusion, Andro increases the sensitivity of PCa cells to TRAIL-induced apoptosis through the generation of ROS and up-regulation of p53 and then promotes PCa cell apoptosis associated with the activation of DR4.

关键词： andrographolide DR4 p53 reactive oxygen species tumor necrosis factor-related apoptosis-inducing ligand

Thermal shock synthesis of carbon nanotubes supporting small-sized rhenium nanoparticles for efficient electrocatalytic hydrogen evolution

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Rare Metals 2023年第7期42卷 2166-2173页

作者： Gang Zhong Rui Zhao Yun-Ru Shi Chao-Ran Li Le he lin he Yang Huang Institute of Functional Nano&Soft Materials(FUNSOM) Soochow UniversitySuzhou215123China State Key Laboratory for Oxo Synthesis and Selective Oxidation Lanzhou Institute of Chemical Physics(LICP)Chinese Academy of SciencesLanzhou730000China Jiangsu Key Laboratory of Advanced Negative Carbon Technologies Soochow UniversitySuzhou215123China

Rhenium(Re)has recently emerged as a promising catalyst in hydrogen evolution reactions(heR)due to its metalhydrogen interaction,which resembles that of *** availability of small-sized Re nanoparticles with abundant a... 详细信息

关键词： conditions sized synthesis

Experimental study of a supersonic turbulent boundary layer using PIV

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Science China(Physics,Mechanics & Astronomy) 2011年第9期54卷 1702-1709页

作者： he lin YI Shihe ZHAO YuXin TIAN LiFeng CheN Zhi College of Aerospace and Material Engineering National University of Defense Technology Changsha 410073 China

Particle image velocimetry was applied to the study of the statistical properties and the coherent structures of a fiat plate turbulent boundary layer at Mach 3. The nanoparticles with a good flow-following capability in supersonic flows were adopted as the tracer particles in the present experiments. The results show that the Van Driest transformed mean velocity profile satisfies the incompressible scalings and reveals a log-law region that extends to yld=0.4, which is further away from the wall than that in incompressible boundary layers. The Reynolds stress profiles exhibit a plateau-like region in the log-law region. The hairpin vortices in the streamwise-wall-normal plane are identified using different velocity decompositions, which are similar to the results of the flow visualization via NPLS technique. And multiple hairpin vortices are found moving at nearly the same velocity in different regions of the boundary layer. In the streamwise-spanwise plane, elongated streaky structures are observed in the log-law region, and disappear in the outer region of the boundary layer, which is contrary to the flow visualization results.

关键词： PIV turbulence supersonic boundary layer hairpin vortices statistical property coherent structures

Study of density field measurement based on NPLS technique in supersonic flow

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Science China(Physics,Mechanics & Astronomy) 2009年第9期52卷 1357-1363页

作者： TIAN LiFeng YI Shihe ZHAO YuXin he lin CheNG ZhongYu College of Aerospace and Material Engineering National University of Defense TechnologyChangsha 410073China

Due to the influence of shock wave and turbulence, supersonic density field exhibits strongly inhomogeneous and unsteady characteristics. Applying traditional density field measurement techniques to supersonic flows yields three problems: low spatiotemporal resolution, limitation of measuring 3D density field, and low signal to noise ratio (SNR). A new method based on Nano-based Planar Laser Scattering (NPLS) technique is proposed in this paper to measure supersonic density field. This method measures planar transient density field in 3D supersonic flow by calibrating the relationship between density and concentration of tracer particles, which would display the density fluctuation due to the influence of shock waves and vortexes. The application of this new method to density field measurement of supersonic optical bow cap is introduced in this paper, and the results reveal shock wave, turbulent boundary layer in the flow with the spatial resolution of 93.2 μm/pixel. By analyzing the results at interval of 5 μs, temporal evolution of density field can be observed.

关键词： NPLS supersonic density field high spatiotemporal resolution

The fractal measurement of experimental images of supersonic turbulent mixing layer

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Science China(Physics,Mechanics & Astronomy) 2008年第8期51卷 1134-1143页

作者： ZHAO YuXin YI Shihe TIAN LiFeng he lin CheNG ZhongYu College of Aerospace and Material Engineering National University of Defense TechnologyChangsha 410073China

Flow visualization of supersonic mixing layer has been studied based on the high spatiotemporal resolution Nano-based Planar Laser Scattering(NPLS) method in SML-1 wind tunnel. The corresponding images distinctly reproduced the flow structure of laminar,transitional and turbulent region,with which the fractal measurement can be implemented. Two methods of measuring fractal dimension were introduced and compared. The fractal dimension of the transitional region and the fully developing turbulence region of supersonic mixing layer were measured based on the box-counting method. In the transitional region,the fractal dimension will increase with turbulent intensity. In the fully developing turbulent region,the fractal dimension will not vary apparently for different flow structures,which em-bodies the self-similarity of supersonic turbulence.

关键词： NPLS turbulence mixing layer fractal dimension

Effect of Sequence Structure on Wetting Behaviors of Fluorinated Methacrylate Polymers Based on Perfluorohexylethyl Methacrylate and Stearyl Acrylate

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Chinese Journal of Polymer Science 2017年第9期35卷 1061-1072页

作者： zi-xu gu jun cheng ming-zu zhang jin-lin he 倪沛红 College of Chemistry Chemical Engineering and Materials Science State and Local Joint Engineering Laboratory for Novel Functional Polymeric Materials Jiangsu Key Laboratory of Advanced Functional Polymer Design and Application Suzhou Key Laboratory of Macromolecular Design and Precision Synthesis Soochow University Suzhou 215123 China

Due to the non-crystalline properties of short chain perfluoroalkyl groups, using short chain perfluoroalkyl to stabilize low surface free energy polymers has been a challenging task. In this study, we prepare a series of random copolymers poly（perfluorohexylethyl methacrylate）-co-poly（stearyl acrylate）（P13FMA-co-PSA） and block copolymers poly（perfluorohexylethyl methacrylate）-b-poly（stearyl acrylate）（P13FMA-b-PSA）, and systematically investigate the effects of the sequence structure and the content of 13FMA of the fluorinated copolymers on surface free energy and surface reorganization. Static/dynamic contact angle goniometry and water/oil repellency analyses demonstrate that the random polymer P13FMA-co-PSA could not achieve low surface free energy and low surface reorganization at the same time. In contrast, for the block copolymer P13FMA-b-PSA, both low surface free energy and low surface reorganization are acquired simultaneously. The results of X-ray photoelectron spectroscopy （XPS）, dynamic contact angle goniometry and differential scanning calorimetry （DSC） reveal the above-mentioned properties. The consecutive 13FMA segments improve the surface fluorine density, while the consecutive SA chains enhance the crystallinity of the SA segments, and further hinder the surface reorganization of the perfluoroalkyl groups. Therefore, P13FMA-b-PSA exhibits a higher utilization efficiency of fluorine atoms and a better structural stability than P13FMA-co-PSA.

关键词： Surface free energy Surface reorganization Perfluorohexylethyl methacrylate (13FMA) Stearyl acrylate (SA) Water/oil repellency