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PROMOTION EFFECT OF MELAMINE ON FLAME RETARDANCY OF EPOXY RESINS CONTAINING CAGED BICYCliC PHOSPHATE

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Chinese Journal of Polymer Science 2007年第6期25卷 581-588页

作者： Jing-ping Hu Dao li yan qin Xing-yi Wang Laboratory for Advanced Materials Research Institute of Industrial Catalysis East China University of Science ＆ Technology Shanghai 200237 China

Caged bicyclic phosphate （CBP） and its dimelamine salt （PDS） were synthesized and added to epoxy resins to obtain the flame retarded epoxy resin composites. The flammability of the composites was characterized by the limiting oxygen index （LOI） and cone calorimeter tests. The LOI values of flame retarded composites increase consistently with the increase of flame retardant amounts, and they are almost the same when the loading of CBP is the same as that of PDS, although the phosphorus content of PDS is much lower than that of CBP. The total heat release increases in the order of CBP30/ER 〈 PDS30/ER 〈 PDS15/ER 〈 CBPI5/ER, whereas that of specific extinction area is CBP15/ER 〉 CBP30/ER 〉 PDS30/ER ≌ PDS15/ER. PDS exhibits more effective inhibition of oxidation of combustible gases. In the tests of thermogravimetric analyses （TG） and Fourier transform infrared spectroscopy （FT-IR）, it is found that the degradation of the composites is influenced greatly by the addition of flame retardants. By scanning electron microscopy （SEM）, a thick and tight char-layer is observed for PDS30/ER, resulting from the interaction of nitrogen species with phosphorus species. Therefore, the combination of CBP with melamine in the flame retarded system can improve the flame retardancy greatly.

关键词： Flame retardancy Thermal degradation Melamine Caged bicyclic phosphate Epoxy resin.

Copper(Ⅰ)-catalyzed Synthesis of Aryl, Heteroaryl and Vinyl Sulfides in Aqueous Two-phase System

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Chemical Research in Chinese Universities 2011年第3期27卷 417-421页

作者： WANG li-jin YUAN yan-qin GUO Sheng-rong College of Chemistry and life Science Lishui University Lishui 323000 P. R. China

A fast and convenient C―S bond formation reaction was achieved catalyzed by CuI/L-proline in aqueous two-phase system providing a simple method for synthesis of aryl sulfides in good yields in short time.

关键词： C―S cross-coupling reaction CuI Thiol Aryl halide Aqueous two-phase system

Synthesis,Crystal Structure and Luminescent Mechanochromism of a Square-planar Pt(Ⅱ) Complex Based on 1,10-Phenanthroline Derivative

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Chinese Journal of Structural Chemistry 2020年第1期39卷 140-146,5页

作者： KANG Jia-Jia NI Jun li yan-qin Chemistry Department Dalian University of TechnologyDalian 116024China

A new square-planar platinum(Ⅱ) complex, [Pt(Me3SiC≡Cphen)(C≡CC6H4Cl-3)2](1), was synthesized by using 3-trimethylsilylethynyl-1,10-phenanthroline(Me3SiC≡Cphen) and 3-chlorophenylacetylene ligands, and its structure was characterized by single-crystal X-ray crystallography. 1 crystallizes in triclinic, space group P1 with a = 6.9524(5), b = 12.7796(11), c = 17.5846(10) ?, α = 78.484(5), β = 88.700(5), γ = 75.600(6)°, V = 1482.23(19) ?3, Z = 2, C33H24Cl2N2 PtSi, Mr = 742.62, Dc = 1.664 g/cm3, F(000) = 724, μ(Mo Ka) = 4.979 mm-1, R = 0.0369 and wR = 0.0786. In 1, adjacent molecules along the a axis are stacked in a columnar structure through π···π interactions, and such neighboring columnar structures are connected with each other by C–H···π hydrogen bonds to form a 2D supramolecular network. 1 exhibits reversible luminescence mechanochromic property with the luminescence red shift in a range of ca. 146~182 nm. Extremely large red-shifts of luminescence spectra suggest that luminescent mechanochromic property of 1 is due to the formation of aggregate via Pt–Pt interaction during the mechanical grinding. Based on this property, a simple device was developed and used for rewritable data storage.

关键词： Pt(Ⅱ)complex crystal structure luminescent mechanochromism data recording device

Design of Central Management & Control Unit for Onboard High-Speed Data Handling System

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Journal of China University of Mining and Technology 2007年第1期17卷 68-72页

作者： li yan-qin JIN Sheng-zhen NING Shu-nian Nattonal Astronomtcal Observatories Chinese Academy of Sciences Beijing 100012 China School of Mechanical Electronic ＆ Information Engineering China University of Mining ＆ Technology Beijing 100083 China

The Main Optical Telescope (MOT) is an important payload of the Space Solar Telescope (SST) with various instruments and observation modes. Its real-time data handling and management and control tasks are arduous. Based on the advanced techniques of foreign countries, an improved structure of onboard data handling systems feasible for SST, is proposed. This article concentrated on the development of a Central Management & Control Unit (MCU) based on FPGA and DSP. Through reconfigurating the FPGA and DSP programs, the prototype could perform different tasks. Thus the inheritability of the whole system is improved. The completed dual-channel prototype proves that the system meets all requirements of the MOT. Its high reliability and safety features also meet the requirements under harsh conditions such as mine detection.

关键词： space solar telescope processing dataflow and control-flow separately onboard data handling system reconfiguration

Electrocaloric effect and pyroelectric properties of organic–inorganic hybrid （C2H5NH3）2CuCl4

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Chinese Physics B 2019年第11期28卷 344-348页

作者： Yi liu yan-Fen Chang Young Sun Jun Shen li-qin yan Zun-Ming Lu School of Material Science and Engineering Hebei University of TechnologyTianjin 300130China Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China Key Laboratory of Cryogenics Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190China

The organic–inorganic hybrid(C2H5NH3)2 CuCl4(EA2CuCl4) single crystals are prepared by the solvothermal condition method. The x-ray diffraction, scanning electron microscopy, dielectric permittivity, pyroelectric current, and heat capacity are used to systematically investigate the electrocaloric performances of EA2CuCl4. The pyroelectric currents are measured under various voltages, and the electrocaloric effect(ECE) is calculated. Its ECE exhibits an isothermal entropy change of 0.0028 J/kg·K under an electric field of 30 kV/cm associated with a relatively broad temperature span. Further, the maximum pyroelectric coefficient(p) is 4× 10^-3 C/m^2·K and the coefficient β for generating ECE from electric displacement D is 1.068× 10^8 J·cm·K^-1·C^-2 at 240 K. Our results indicate that the ECE behavior of organic–inorganic hybrid EA2CuCl4 is in accordance with Jona and Shirane’s opinion in which the ECE should occur both below and above the Curie temperature Tc.

关键词： electrocaloric effect pyroelectric properties organic–inorganic perovskite

Descaling Behavior of 430 Hot-rolled Stainless Steel in HCl-based Solution

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Journal of Iron and Steel Research International 2016年第3期23卷 190-196页

作者： Ying-ying YUE Cheng-jun liU Pei-yang SHI Mao-fa JIANG li-yan qin Guang-wei FAN School of Materials and Metallurgy Northeastern University Shanxi Taigang Stainless Steel Co. Ltd.

Descaling of hot-rolled stainless steel is generally implemented through pickling process in HNO_3-HF mixed acids,which induces severe environmental concerns of nitrogen oxide（NOx）gases and *** to the electrochemical measurement,the mass loss test and the appearance analysis,a new pickling process which employed HCl-based solution was proposed and evaluated to provide theoretical basis for the development of environment-friendly and highly effective pickling *** the experimental condition,the HCl-based solution can compete with ordinary HNO_3-HF mixed acids in terms of pickling efficiency,surface integrity and the removal of Crdepleted *** descaling process of 430hot-rolled stainless steel in the HCl-based solution consisted of three *** descaling solution penetrated the oxide scales into the underlying metal,dissolving the Cr-depleted layer and part of *** oxide scales peeled off from the stainless steel and a polished and smooth surface was *** descaled stainless steel was dissolved uniformly in the HCl-based solution;therefore,the pickling duration was vital for desired surface *** the static condition,the appropriate descaling time of 430 hotrolled stainless steel in HCl-based solution was 400 s.

关键词： descaling hot-rolled ferritic stainless steel pickling electrochemistry

Quantitative Study of Iron Metabolism-related Genes Expression in Rat

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Biomedical and Environmental Sciences 2013年第10期26卷 808-819页

作者： li yan qin BAI Bin ZHENG Quan qing yan Hong ZHUANG Gui Hua Department of Public Health College of MedicineXi’an Jiaotong University Department of Orthopedics The First Affiliated Hospital of the College of MedicineXi’an Jiaotong University

Objective To investigate the multiple iron metabolism-related genes expression, its regulation by iron and the expression correlation among the genes in rat tissues. Methods Two groups （n=30） of Sprague-Dawley female weanling rats were fed with a control diet and an iron deficient diet respectively for 4 weeks. All rats were then sacrificed, and blood and tissue samples were collected. The routine blood examination was performed with a veterinary automatic blood cell analyzer. Elemental iron levels in liver, spleen and serum were determined by atomic absorption spectrophotometry. The mRNA expression of genes was detected by real-time fluorescence quantitative PCR. Results After 4 weeks, the hemoglobin （Hb） level and red blood cell （RBC） count were significantly lower in the iron deficient group compared with those in the control group. The iron levels in liver, spleen and serum in the iron deficient group were significantly lower than those in the control group. In reference to small intestine, the relative expression of each iron-related gene varied in the different tissues. Under the iron deficiency, the expression of these genes changed in a tissue-specific manner. The expression of most of the genes significantly correlated in intestine, spleen and lung, but few correlated in liver, heart and kidney. Conclusion Findings from our study provides new regulation by iron and correlation among the mRNA divalent metal transporter 1, ferritin, iron regulation protein, hepcidin, ferroportin 1 and hephaestin in intesti understandings about the relative expression, expressions of transferrin receptors 1 and 2, proteins 1 and 2, hereditary hemochromatosis ne, liver, spleen, kidney, heart, and lung of rat.

关键词： Iron Tfr Dmtl Hepcidin Ferroportin 1 Hephaestin

High Efficient Green Emission from Organic Multi-quantum Wells Structure

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Chinese Physics Letters 1999年第2期16卷 149-151页

作者： XIE Zhi-yuan HUANG Jing-song li Chuan-nan CHEN Bai-jun liU Shi-yong li yan-qin WANG Yue SHEN Jia-cong State Laboratory of Integrated Optoelectronics Jilin UniversityChangchun 130023 Key Laboratory of Supramolecular Structure and Spectroscopy Jilin UniversityChangchun 130023

Organic green light emitting devices(LEDs)with multi-quantum wells(MQWs)structure were *** diamine was used as hole-transporting layer and potential barrier layer;tris(8-hydroxyquinoline)aluminum acted as electron transporting layer and MQWs green emitting *** influence of the barrier layer thickness and quantum well number to the device performance was also *** barrier thickness must be thin(such as 4nm)enough to tunnel through and distribute charge carriers uniformly in different wells(mainly electrons).The organic MQWs LEDs showed enhanced electroluminescent *** luminous efficiency and external quantum efficiency were 1.241m/W and 1.04%,respectively.

关键词： quantum barrier luminous

Surface states modulated exchange interaction in Bi2Se3/thulium iron garnet heterostructures

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Chinese Physics B 2020年第11期29卷 151-155页

作者： Hai-Bin Shi li-qin yan yang-Tao Su li Wang Xin-Yu Cao lin-Zhu Bi yang Meng yang Sun Hong-Wu Zhao Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China Songshan Lake Materials Laboratory Dongguan 523808China

We investigate the modulation of magnetic anisotropy of thulium iron garnet(TmIG)films by interfaced Bi2Se3 thin *** quality epitaxial growth of Bi2Se3 films has been achieved by molecular beam epitaxy on TmIG *** the method of ferromagnetic resonance,we find that the perpendicular magnetic anisotropy(PMA)of TmIG can be greatly strengthened by the adjacent Bi2Se3 ***,the competition between topological surface states and thickness dependent bulk states of Bi2Se3 gives rise to the modulation of PMA of the Bi2Se3/TmIG *** interfacial interaction can be attributed to the enhanced exchange coupling between Fe^3+ions of TmIG mediated by topological surface electrons of Bi2Se3.

关键词： topological surface states interfacial exchange coupling perpendicular magnetic anisotropy