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RISS 인기검색어
- 검색키워드
- 저자 : De-Yun Ma (검색결과 6 건)
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Ma, De-Yun,Guo, Hai-Fu,Qin, Liang,Xu, Jun Korean Chemical Society 2013 Bulletin of the Korean Chemical Society Vol.34 No.9
Two new isostructural dinuclear complexes, $Ln_2(4-cpa)_6(bpy)_2$ (Ln = Eu (1); Tb (2), 4-cpa = 4-chlorophenylacetate, bpy = 2,2'-bipyridine), have been hydrothermally synthesized and characterized by IR spectroscopy, elemental analysis, thermogravimetric analysis (TGA), powder X-ray diffraction and single-crystal X-ray diffraction. The lanthanide ions are bridged by two bidentate and two terdentate carboxylate groups to give centrosymmetric dimers with $Ln{\cdots}Ln$ separations of 3.967(2) and 3.956(3) ${\AA}$, respectively. Each metal atom is nine-coordinate and exhibits a distorted tricapped trigonal prismatic geometry. Three-dimensional fluorescence spectra show that both 1 and 2 emit bright red and green luminescence at room temperature, with long lifetimes of up to 0.369 ms (at 614 nm) and 0.432 ms (at 543 nm), respectively. Moreover, poor luminescence efficiency has been noted for complex 2. The 4-Hcpa ligand and complexes 1-2 have been screened for their phytogrowth-inhibitory activities against Brassica napus L. and Echinochloa crusgalli L., and the results are compared with the activity of quizalofop-P-ethyl.
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De-Yun Ma,Hai-Fu Guo,Liang Qin,Jun Xu 대한화학회 2013 Bulletin of the Korean Chemical Society Vol.34 No.9
Two new isostructural dinuclear complexes, Ln2(4-cpa)6(bpy)2 (Ln = Eu (1); Tb (2), 4-cpa = 4-chlorophenylacetate, bpy = 2,2'-bipyridine), have been hydrothermally synthesized and characterized by IR spectroscopy, elemental analysis, thermogravimetric analysis (TGA), powder X-ray diffraction and single-crystal X-ray diffraction. The lanthanide ions are bridged by two bidentate and two terdentate carboxylate groups to give centrosymmetric dimers with Ln···Ln separations of 3.967(2) and 3.956(3) Å, respectively. Each metal atom is nine-coordinate and exhibits a distorted tricapped trigonal prismatic geometry. Three-dimensional fluorescence spectra show that both 1 and 2 emit bright red and green luminescence at room temperature, with long lifetimes of up to 0.369 ms (at 614 nm) and 0.432 ms (at 543 nm), respectively. Moreover, poor luminescence efficiency has been noted for complex 2. The 4-Hcpa ligand and complexes 1-2 have been screened for their phytogrowthinhibitory activities against Brassica napus L. and Echinochloa crusgalli L., and the results are compared with the activity of quizalofop-P-ethyl.
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Study on molten salt oxidation process of simulated Co doped cation exchange resins
Yun Xue,Yue-Lin Wang,Yu Li,Wen-Da Xu,Fu-Qiu Ma,Yang-Hai Zheng,Qing-Guo Zhang,Zhi Zhang,Mi-lin Zhang,Yong-De Yan 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.126 No.-
Cation exchange resins (CERs) are widely applied to purify waste liquids generated during the operationof nuclear reactors. The radioactive nuclides 60Co and 58Co are important corrosion activation products inreactor cooling water. In this study, the simulated Co doped CERs were oxidized with ternary carbonate. According to the thermogravimetric analysis (TG), the decomposition of Co doped CERs includes threeprocesses: 1. Elimination of the osmotic water; 2. Pyrolysis of sulfonic acid group; 3. Destruction of styrene–divinylbenzene copolymer. The X-Ray Diffraction (XRD) patterns indicate that sulfur mainly exists inthe form of sulfate in waste salt. The Co2+ undergoes the path of CoS2 ? Co3O4 with the increase of temperatureand the transition point is 650 C. Combined with Fourier Transform Infrared Spectrometer (FTIR)spectra and X-ray Photoelectron Spectroscopy (XPS) analysis, sulfonic acid groups begin to decomposeat 350 C. During the molten salt oxidation process, most of the sulfur in sulfonic acid groups is entrappedby carbonate as the form of sulfate, and a little of which remains as sulfone group, sulfoxide group andsulfur bridge in residue. When the resins are oxidized at 800 C, the retention rate of Co2+ is 97.3%, indicatingthat the molten salt oxidation can effectively remain Co2+ and convert it into a more stablesubstance.
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A Study on Control of Heater Power and Heating Time for Thermoforming
Zhen-Zhe Li,Guang Ma,Dong-Ji Xuan,Seoung-Yun Seol,Yun-De Shen 한국정밀공학회 2010 International Journal of Precision Engineering and Vol. No.
Obtaining a uniform thickness of the final product using thermoforming is difficult, and the thickness distribution depends strongly on the distribution of the sheet temperature. In this paper, the time-dependent temperature distribution of the total sheets in the storing stage was studied because the temperature after the storing stage is the initial temperature of the heating process. An analytic solution for simulating the storing stage was derived. Using the solved analytic solution, the time-dependent temperature distribution of the total sheets was found out under the condition of assuming that the temperature-dependent specific heat of the ABS sheets was a certain constant value. Finally, the control method for a successful thermoforming using the heater power or heating time was researched in order to improve the quality of the final products. The results show that the satisfied temperature distribution can be obtained by adjusting the heater power or heating time. The method for analysis in this study will be used to improve the quality of the final products.
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Liang-Yao Chen,Su-Xing Pan,Yun-Fei Wu,Lai Wei,Yu-Xiang Zheng,You-Yuan Zhao,De-Wang Ma 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.4
We have investigated the probing beam transmitance due to the photon-induced anisotropy effect in the bacteriorhodopsin/polymer composite film(bR/PC film) by using the probing-pumping beam method under different laser wavelengths. By using a theoretical simulation, we give the characteristics of the birefringence Δn and the dichroism ΔD for various wavelengths of the probing and the pumping beams.
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Xin Liu,Zi-Yu Liu,Yang-Hai Zheng,Yong-De Yan,Wen-Da Xu,Yun Xue,Yue-Lin Wang,Fu-Qiu Ma,Kai Zhu,Yu-Sheng Yang 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.120 No.-
The disposal of spent radioactive ion exchange resin generated during the operation of nuclear facilitieshas always been a conundrum. The molten salt oxidation (MSO) for the treatment of mixed resin (MR)shows obvious superiority. In this work, ternary carbonate (Li2CO3-Na2CO3-K2CO3) and MR was usedas the molten salt system and the oxidation target, respectively. The oxidation behavior of MR was analyzedby varying the temperature and oxygen equivalent during the MSO process. By studying the effectof different oxygen equivalents on the oxidation efficiency, the oxygen equivalent of 125% could make theoxidation efficiency of MR reach 99.99% at 800 C. The composition of C, N and S containing exhaust gasproduced through MSO process of MR with temperature were almost consistent with the simulationresults. The exhaust gas was successfully adsorbed by molten carbonate to produce nitrate and sulfurcompounds. The carbonate has good absorption to harmful gases such as SO2, CO, NO, etc. The contentof SO2 from the highest 0.32% to 0, and 71.23% of sulfur in MR was trapped by molten carbonate asthe form of sulfate. This work has important implications for reducing the potential harm of radioactivewaste resin to the environment.
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