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Electroless plating of copper layer on surfaces of urea-formaldehyde microcapsule particles containing paraffin for low infrared emissivity

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Particuology 2016年第1期14卷 159-163页

作者： xi zhou Jian Mao Zhen Qiao College of Materials Science and Engineering Sichuan University No. 24 South Section 1 Yihuan Road. Chengdu 610064 Sichuan China

A copper coating was deposited by electroless plating on the surfaces of urea-formaldehyde microcap- sules containing paraffin （UFP） particles. This composite microcapsule structure had low infrared OR） emissivity and maintained a constant temperature, and could be used in IR stealth applications. The eiectroless copper layer formation and its micro-appearance, and the effect of the copper layer on the IR emissivity and thermal properties of the composite microcapsules were investigated. The IR emissivity of the composite microcapsules at wavelengths of 1-14 μm gradually decreased with increasing copper mass on the surface. After formation of an integrated copper layer, the rate of IR emissivity decrease was lower. This is because the copper coating improves the surface conductivity of the UFP; a high conductivity results in high reflectivity, which leads to a decrease in IR emissivity. The lowest IR emissivity achieved was 0.68. The phase-change enthalpy of the composite microcapsules decreased with increasing amount of copper coated on the surface because of the high density of copper. When the mass increase of the UFP after electroless copper plating was about 300%, the composite microcapsules had low IR emissivity （about 0.8） and a high phase-change enthalpy （80J/g）.

关键词： Phase-change material Urea-formaldehyde microcapsules containing paraffin particle Electroless copper plating Low infrared emissivity Enthalpy

Insight into the reaction mechanism of sulfur chains adjustable polymer cathode for high-loading lithium-organosulfur batteries

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Journal of Energy Chemistry 2021年第5期30卷 238-244页

作者： Jinqiu zhou xi zhou Yawen Sun xiaowei Shen Tao Qian Chenglin Yan Soochow Institute for Energy and Materials Innovations College of EnergyKey Laboratory of Advanced Carbon Materials and Wearable Energy Technologies of Jiangsu ProvinceSoochow UniversitySuzhou 215006JiangsuChina Institute of Chemical Industry of Forestry Products Chinese Academy of ForestryNanjing 210042JiangsuChina

Small molecules with adjustable sulfur atoms in the confined structure were acted as precursor for the synthesis of polymer cathodes for lithium-organosulfur *** them,poly(diallyl tetrasulfide)(PDATtS)delivered a high capacity of 700 mAh g^(-1),stable capacity retention of 85%after 300 cycles,high areal capacity~4 m Ah cm^(-2) for electrode with up to 10.3 mg cm^(-2) *** insight into the reaction mechanism of PDATtS electrode that radicals arisen from the homolytic cleavage of S-S bond in PDATtS reacted with Li+to generate thiolates(RSLi)and insoluble lithium sulfides(Li_(2)S)or lithium disulfide(Li_(2)S_(2))was clearly verified by in-situ UV/Vis spectroscopy,nuclear magnetic resonance(NMR)studies and density-functional theory(DFT)***,based on the unique reaction mechanism,problems of rapid capacity fading due to the formation of soluble polysulfide intermediates and their serious shuttle effect in conventional lithium-sulfur(Li-S)batteries was totally avoided,realizing the dendrite-free lithium sulfur *** study sets new trends for avenues of further research to advance Li-S battery technologies.

关键词： Lithium-sulfur battery Organosulfur polymer Adjustable sulfur chains Cathode material

2.5-Dimensional modeling of EM logging-while-drilling tool in anisotropic medium on a Lebedev grid

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Petroleum Science 2023年第1期20卷 249-260页

作者： Zhen-Guan Wu Hu Li xi-zhou Yue School of Geoscience and Technology Southwest Petroleum UniversityChengduSichuan610500China Maxwell Dynamics Inc. HoustonTX77074USA Well-tech R&D Institute China Oilfield Services LimitedBeijing101149China

A 2.5D finite-difference(FD)algorithm for the modeling of the electromagnetic(EM)logging-whiledrilling(LWD)tool in anisotropic media is *** FD algorithm is based on the Lebedev grid,which allows for the discretization of the frequency-domain Maxwell's equations in the anisotropic media in 2.5D scenarios without *** leads to a system of linear equations that is solved using the multifrontal direct solver which enables the simulation of multi-sources at nearly the cost of simulating a single source for each *** addition,near-optimal quadrature derived from an optimized integration path in the complex plane is employed to implement the fast inverse Fourier Transform(IFT).The algorithm is then validated by both analytic and 3D *** results show that two Lebedev subgrid sets are sufficient for TI medium,which is common in geosteering *** number of quadrature points is greatly reduced by using the near-optimal quadrature method.

关键词： 2.5D modeling Electromagnetic logging-while-drilling Anisotropic medium Lebedev grid

Mechanism of Embrittlement and De-Embrittlement for 2.25Cr-1Mo Steel

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Journal of Iron and Steel Research International 2011年第3期18卷 47-51页

作者： ZHANG xi-liang zhou Chang-yu School of Mechanical and Power Engineering Nanjing University of TechnologyNanjing 210009JiangsuChina

The constant embrittlement curve for constant segregation concentration on grain boundary of impurity element P and relationship between equilibrium grain boundary segregation concentration and operation time for 2.25Cr-1Mo steel were derived based on the theory of equilibrium grain boundary *** mechanism of step-cooling test and mechanism of de-embrittlement for 2.25Cr-1Mo steel were *** segregation rate will increase but equilibrium grain boundary segregation concentration of impurity element P will decrease as temperature increases in the range of temper embrittlement *** is one critical temperature of embrittlement corresponding to each embrittlement *** the further heat treating temperature is higher than critical temperature,the heat treating will become a de-embrittlement process;otherwise,it will be an embrittlement *** critical temperature of embrittlement will shift to the direction of low temperature as further *** a result,some stages of step-cooling test would change into a de-embrittlement *** grain boundary desegregation function of impurity element P was deduced based on the theory of element diffusion,and the theoretical calculation and experimental results show that the further embrittlement or de-embrittlement mechanism can be interpreted qualitatively and quantitatively by combining the theory of equilibrium grain boundary segregation with constant embrittlement curve.

关键词： step-cooling test critical embrittlement temperature embrittlement mechanism grain boundary desegregation

Chinese Herbal Medicine Adjusting Brain Microenvironment via Mediating Central Nervous System Lymphatic Drainage in Alzheimer's Disease

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Chinese Journal of Integrative Medicine 2022年第2期28卷 176-184页

作者： zhou xi-bin ZHANG Yu-xing zhou Chun-xiang MA Jun-jie Department of Traditional Chinese Medicine Nanjing University of Chinese MedicineNanjing(210046)China Department of Traditional Chinese Medicine Nanjing BenQ HospitalNanjing(210036)China

Due to its complex pathogenesis and lack of effective therapeutic methods,Alzheimer's disease(AD)has become a severe public health problem *** studies have discovered the function of central nervous system lymphatic drainage,which provides a new strategy for the treatment of *** herbal medicine(CHM)has been considered as a cure for AD for hundreds of years in China,and its effect on scavengingβ-amyloid protein in the brain of AD patients has been *** this review,the mechanism of central nervous system lymphatic drainage and the regulatory functions of CHM on correlation factors were briefly *** advances in our understanding regarding the treatment of AD via regulating the central lymphatic system with CHM will promote the clinical application of CHM in AD patients and the discovery of new therapeutic drugs.

关键词： Alzheimer's disease Chinese herbal medicine central lymphatic system

Synthesis and Crystal Structure of [Cp_2Ln(OC(SEt)NPh )]_2

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Chinese Journal of Structural Chemistry 2006年第2期25卷 131-134页

作者： ZHANG Chun-Mei LIU Rui-Ting zhou xi-Geng Department of Chemistry Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials Fudan University Shanghai 200433 China Department of Chemistry East China University of Science and Technology Shanghai 200237 China

Treatment of Cp3Y with EtSH, followed by reaction with an equivalent of PhNCO, yielded the dinuclear complex [Cp2Y（μ-η^1：η^3-OC（SEt）NPh）]2. The structure was characterized by elemental analysis, IR, MS and single-crystal X-ray diffraction analysis. The title compound crystallizes in triclinic, space group P1^- with a = 8.643（3）, b = 10.752（4）, c = 11.161（4）A°, α= 117.840（5）, β = 94.086（5）, γ= 101.008（5）°, V = 884.8（6） A°^3, Z = 1, Mr = 798.66 （C38H40N2O2S2Y2）, λ（MoKα） = 0.710730 .A°, ,μ= 3.417 mm^-1, Dc = 1.499 g/cm^3, F（000） = 408, the final R = 0.0453 and wR = 0.1007 for 3067 unique reflections （Rint = 0.0317） with 2357 observed ones （I 〉 2σ（I））. X-ray analysis reveals an unusual bonding mode of the OC（SEt）NPh ligand and the OCN fragment acts as a both bridging and side-on chelating ligand. Each yttrium atom is coordinated by two η^5-cyclopentadienyl groups, one chelating η^3-OC（SEt）NPh ligand and one bridging O atom from another η^3-OC（SEt）NPh ligand.

关键词： organolanthanide isocyanate insertion structure cyclopentadienyl

Validation of Flight Control Law Based on LFT and Structured Singular Value

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Chinese Journal of Aeronautics 2007年第1期20卷 60-65页

作者： zhou xi LIU Lin CHEN Zong-ji DUAN Hai-bin School of Automation Science and Electrical Engineering Beijing University of Aeronautics and Astronautics Beijing 100083 China

The main goal of flight clearance is to use the structured singular value （ μ ） analysis of the flight control system when some parameters in the system vary in a certain range. As the p-analysis can only be done on a linear fractional transformation （LFT） model, the first step of flight clearance is to generate the LFT model of the flight control system. In this paper, based on the introduction of basic theory of LFT and μ-analysis, an X-fighter is chosen as an example to utilize the proposed methods. In order to realize the flight clearance process automatically, a novel soRware package based on MATLAB programming language is developed. The results of simulation experiments validate the feasibility and effectiveness of the novel methods proposed in this paper.

关键词： flight clearance LFT g-analysis robust stability uncertain parameter

Effects of hot deformation and in-situ ZrB2 particle on microstructure and tensile performance of AA7085 composite sheets

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Journal of Iron and Steel Research International 2024年第7期31卷 1778-1791页

作者： Jiang-jing Wu xi-zhou Kai Chuang Guan Yu-tao Zhao School of Material Science and Engineering Jiangsu UniversityZhenjiang 212013JiangsuChina

To provide a new idea to reduce anisotropy for sheets in the thickness direction by microstructure modification and,mean-while,maintain or even enhance tensile performance,the in-situ ZrB2 particle/AA7085 composite sheets with thicknesses of 1,2,3,and 6 mm were *** as-cast grain size was significantly refined by the heterogeneous nucleus of the ZrB2 *** microstructure results show that severe hot deformation converts as-cast disordered microstructure into a sequential microstructure by crushing the remanent phases and matrix into a fiber *** the solid solution and aging heat treatment,the composite sheets exhibit largely recrystallized grains compared with partially recrystallized grains in the matrix sheets,and weak or even free texture exists in the *** grain size in the composite sheets decreases with the increase in thickness *** the thickness range of 1-3 mm,the composite sheets maintain a similar tensile per-formance as that in matrix sheets,while the strength and ductility in the 6-mm-thick composite sheet are improved.

关键词： Composite sheet Grain structure Texture Dislocation Strengthening

Ultrasound-targeted cationic microbubble-mediated gene transfection and inhibition of retinal neovascularization

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International Journal of Ophthalmology(English edition) 2022年第6期15卷 876-885页

作者： Ming-xing Wu Yu zhou xi-Yuan zhou Yan Xu Department of Ophthalmology Second Affiliated Hospital of Chongqing Medical UniversityChongqing 400010China

AIM:To investigate whether ultrasound-targeted cationic microbubbles(CMBs)destruction could deliver endostatingreen fluorescent protein(GFP)plasmids efficiently to the human retinal endothelial cells(HRECs)and inhibit retinal neovascularization in ***:CMBs were prepared and the presentation of GFP reporter was confirmed by flow cytometry and laser confocal *** assessing HRECs migration and vascular formation were per formed to evaluate gene therapy’s efficiency in vitro.A mouse model of oxygen-induced retinopathy was employed and the expression of Bcl-xl,Bcl-2,vascular endothelial growth factor(VEGF)and endostatin in the retina of mice were determined by Western blotting and quantitative polymerase chain reaction(q PCR).The expression of endostatin-GFP in the retina was examined by laser confocal microscopy at 5,14,and 28 d after ***:The gene expression of endostatin was the highest in the group of the ***,the inhibition and antiangiogenesis effect of the migration and development of HRECs were improved following treatment with CMBs compared with the other groups in *** vivo,retinal neovascularization was significantly inhibited and the fluorescence intensity of endostatin-GFP in the mouse retina was importantly higher in the group of CMBs than that in other ***:The research illustrates ultrasoundtargeted CMBs destruction possessed distinct effect on the inhibition of the vascular formation and the development of retinal neovascularization both in vitro and in vivo.

关键词： ultrasound cationic microbubbles human retinal vascular endothelial cells gene transfection retinal neovascularization