Removal of Cr(VI) from aqueous solution by surfactant-modified kaolinite

Xiaoying Jin,Mingqin Jiang,Jianhua Du,Zuliang Chen 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.5

Removal of Cr(VI) from aqueous solution by hexadecyltrimethylammonium chloride (HDTMA) modified kaolinite (HMK) was investigated, where the maximum adsorptive capacity reached 27.8 mg/g Cr(VI) using HMK compared with only 0.7 mg/g using unmodified natural kaolinite (NK). The adsorption of Cr(VI) on HMK can be well described by the Langmuir isotherm, and the kinetic adsorption of Cr(VI) on both HMK and NK fitted a pseudo-second-order model. FTIR analysis showed that surface modified HDTMA was responsible for the high adsorptive capacity of Cr(VI). HMK was used to remove Cr(VI) from an electroplating wastewater.

Three-Dimensional FeSe2 Microflowers Assembled by Nanosheets: Synthesis, Optical Properties, and Catalytic Activity for the Hydrogen Evolution Reaction

Xiaoying Chang,Jikang Jian,Gemei Cai,Rong Wu,Jin Li 대한금속·재료학회 2016 ELECTRONIC MATERIALS LETTERS Vol.12 No.2

Three-dimensional FeSe2 microflowers were synthesized for the firsttime by a facile solvothermal method, using FeCl2·4H2O and seleniumpowder as raw materials, along with ethanolamine as solvent. Theproducts were characterized by X-ray diffraction (XRD), scanningelectron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS),transmission electron microscopy (TEM), and X-ray photoelectronspectroscopy (XPS). The results show that the FeSe2 microflowersconsist of nanosheets with a thickness of about 50 - 80 nm. The Ramanspectrum shows the characteristic peaks of Se-Se vibration modes. Theoptical band gap of the sample was determined to be 1.48 eV by UVvisibleabsorption spectroscopy. The photoluminescence properties ofthe FeSe2 microflowers and their catalytic activity for the hydrogenevolution reaction were also assessed. Finally, a possible growthmechanism of the FeSe2 microflowers is proposed.

Health oil preparation from gardenia seeds by aqueous enzymatic extraction combined with puffing pre-treatment and its properties analysis

Chengyu Jin,Lingyun Wang,Xiaoying Liu,Yuanchao Lu,Ningxiang Yu,Xiaohua Nie,Qin Ye,Xianghe Meng 한국식품과학회 2023 Food Science and Biotechnology Vol.32 No.14

Gardenia jasminoides Ellis, a representative for “homology of medicine and food”, can be used to produce pigment and edible oil. Here, aqueous enzymatic extraction (AEE) combined with puffing pre-treatment was explored to prepare oil from gardenia seeds. Both wet-heating puffing (WP) at 90 °C and dry-heating puffing (DP) at 1.0 MPa facilitated the release of free oil by AEE, resulting in the highest free oil yields (FOY) of 21.8% and 23.2% within 3 h, much higher than that of un-puffed group. Additionally, active crocin and geniposide were also completely released. The FOY obtained was much higher than mechanical pressing method (10.44%), and close to solvent extraction (25.45%). Microstructure analysis indicated that gardenia seeds expanded by dry-heating puffing (1.0 MPa) had a larger, rougher surface and porous structure than other groups. Overall, AEE coupled with puffing pre-treatment developed is an eco-friendly extraction technology with high efficiency that can be employed to oil preparation.

명 · 청시기 조선 사신들의 대중국 인식 변화 양상에 대한 연구

김철(Jin, Zhe),황효영(Huang, xiaoying) 가천대학교 아시아문화연구소 2015 아시아문화연구 Vol.39 No.-

본 논문은 역사, 문화적 고찰이라는 시각에서 현재 한국에서 최신 자료정리 성과로 인정받고 있는 임기중(林基中)의 100권 『연행록전집』(2001)과 50원 『연행록속집』(2008), 『연행록총간증보판DB』(2013), 그리고 임형택(林熒澤)의 3권 『연행록선비보유(上·中·下) 중에 기록되어 있는 산해관 관련 시(詩)들을 주요 연구대상으로 삼고 거기에 나타난 조선 사신들의 대중국 인식 양상을 고찰하였다. 명·청시기 산해관은 외교적 목적으로 중국에 드나들었던 조선 사신들에게 있어서 다양한 이국 생활과 문화를 체험을 할 수 있는 특별한 공간이었다. 고대 조선 사신들이 이와 같은 산해관을 소재로 수백 수에 달하는 관련 시(詩)들을 창작한 사실을 통해 우리는 산해관이 그들의 심목 중에 차지하는 비중이 얼마나 컸는지를 김작할 수 있다. 지역적인 경계뿐만 아니라 관념적인 화이(華夷)경계로 인지된 산해관은 산해관시(詩)의 중요한 이미지이다. 본 논문은 이와 같은 산해관시(詩)들에 대해 전면적이고도 세밀한 분석을 진행함으로써 명·청 교체시기를 전후하여 나타난 조선 사신들의 대중국 인식이 전통적인 화이관과 대명의리, 또는 소중화(小中華)의식을 바탕으로 하고 있음을 밝혀냈다. 본 연구는 명·청 교체를 전후한 조선 사신들의 대중국 인식의 변화를 전면적이고도 객관적으로 이해하는 데, 그리고 본 논문에서 거론한 산해관시(詩)가 중한고대문학교류사에서 차지하는 의의를 새롭게 규명하는 데 모두 일정한 도움이 될 것으로 믿어 의심치 않는다. At present, The Collected Works of Yeonhaengrok(100 Volumes, written by Key Zung Lim, 2001), The Sequel of Yeonhaengrok(50 Volumes, written by Key Zung Lim, 2008), Supplementary Edition of General Yeonhaengrok DB(Key Zung Lim, 2013) and The Addendum of Yeonhaengrok Anthology(3 Volumes, written by Hyong Taek Lim, 2008) has gained approval in academic circles of South Korea. This study, which focuses on Shanhaiguan poetry in above data, will research the cognize of China by Chosun envoys in aspects of history and culture. Shanhaiguan is an especial place for Chosun envoys, in which they can experience and observe exotic life and culture. Therefore, they left hundreds of poetries about Shanhaiguan, which reflected its important role. The image of Shanhaiguan mainly reflected in geographical boundary and the differences of Chinese and barbarian. The paper will study the China-centered mentality, consciousness of worship and distinction of Chinese and barbarian in cognize of China by Chosun envoys at the turn of Ming and Qing Dynasty by comprehensive and detailed analysis on Shanhaiguan poetry. There is no doubt that the paper can help us to know the change of cognize and attitude of China by Chosun envoys objectively at the turn of Ming and Qing Dynasty, and it can also help us to find their significance in field of literary history.

Enhanced degradation of malachite by iron nanoparticles encapsulated in sodium alginate beads

Shenliang Zeng,Xiaoying Jin,Dharmarajan Rajarathnam,Zuliang Chen 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.77 No.-

Encapsulation of the Fe NPs was synthesized by tea extract and dispersed within sodium alginate beads(Fe-SA-B), and used the degradation of malachite (MG). The results showed that a 92.3% of MG wasremoved using Fe NPs encapsulated sodium alginate beads (SA-Fe-B), while only 52% of MG was removedby free Fe NPs. Kinetics studies showed that a pseudo-second-order model well described the adsorptionof MG using SA-Fe-B, indicating initial adsorption of MG onto calcium alginate beads followed bydegradation through SA-Fe-B. The reusability of SA-Fe-B showed that thefirst 3 cycles were degradedabout 85% of MG.

Simultaneous removal of Pb(II) and Cr(III) by magnetite nanoparticles using various synthesis conditions

Ting Wang,Xiaoying Jin,Zuliang Chen,Mallavarapu Megharaj,Ravendra Naidu 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.5

This study concerns the removal of Pb(II) and Cr(III) using magnetite nanoparticles synthesized by coprecipitation methods with (NCM) or without (CM) nitrogen gas passing through. Removal of Pb(II) significantly decreased from 80.56 to 41.41% when Cr(III) was co-presented, while decrease of Cr(III) was negligible when Pb(II) was present, falling from 42.37 to 38.48%. The characterizations indicated that the removal mechanism occurred through adsorption rather than chemical redox reaction. A co-adsorption mechanism is based on Pb(II) involved surface complexation, while Cr(III) was firstly adsorbed onto magnetite, followed by a partially substitution of Cr(III) for Fe(III) in Cr-Fe3O4 through ion exchanges.

The mutation of Scenedesmus obliquus grown in municipal wastewater by laser combined with ultraviolet

Xu Zhou,Wenbiao Jin,Song-fang Han,Xiaoye Li,Shu-Hong Gao,Chuan Chen,Guo-jun Xie,Renjie Tu,Qing Wang,Qilin Wang 한국화학공학회 2019 Korean Journal of Chemical Engineering Vol.36 No.6

Mutagenetic breeding is an efficient technique for the enhancement of lipid productivity from microalgae. In this study, oil-rich microalga Scenedesmus obliquus were treated by Laser-UV composite mutagenesis. Among the 35 mutant strains, X5 was primely screened. Afterwards, a twice UV mutagenizing was operated on X5, and the optimal mutant strain X5-H13 was obtained. The growth rate, dry weight, lipid yield and lipid content of X5-H13 were 0.698× 107 cells/mL·d, 0.99 g/L, 0.49 g/L and 48.8% while cultivated in municipal wastewater, respectively, which were increased by 45%, 58%, 109% and 32% than the original strain. The results of the subculture of repeated mutant showed that the biomass and lipid content of strain X5-H13 were up to 0.99 g/L and 48.8%. The growth of each generation was stable. Furthermore, the random amplified polymorphic DNA analysis indicated that the mutant strain X5-H13 was different from the starting strain, with their genetic similarity coefficient value of 0.815.

중국 유아를 위한 지속가능발전지향 창의인성교육 프로그램 개발

김경철(Kim, Kyung-Chul),한유진(Han, Yoo-Jin),심효영(Xiaoying, Shen) 한국교원대학교 유아교육연구소 2020 한국유아교육연구 Vol.22 No.2

본 연구에서는 지속가능한 발전을 지향하는 가치를 가지고 창의인성의 사고와 태도를 기를 수 있도록 지원하기 위한 교육 프로그램을 개발하는 데 목적이 있다. 이에 「중국 유아를 위한 지속가능발전지향 유아 창의인성교육 프로그램」은 1단계 문제분석 및 기획, 2단계 정보수집 및 통합, 3단계 설계, 4단계 초기개발, 5단계 평가 및 수정개발의 5단계 개입연구방법에 따라 프로그램을 개발하였다. 연구결과, 첫째, 면담조사와 현장조사 결과를 근거로 개입 구성요소와 개발원칙을 개발하였으며, 중국 국가수준 유아교육과정과 전문가 서면평가 실시 결과를 토대로 프로그램 원형을 설계하였다. 초기 프로그램 개발과 예비연구를 거쳐 프로그램을 구성하고 중국 북경의 사립유치원 유아를 대상으로 8주 동안 18회기에 걸쳐 프로그램을 적용하였다. 둘째, 프로그램 적용 결과, 「중국 유아를 위한 지속가능발전지향 유아 창의인성 교육 프로그램」은 실험집단 유아의 창의성과 인성의 향상에 긍정적인 효과가 있었다. 이에 본 연구에서 개발된 「중국 유아를 위한 지속가능발전지향 유아 창의인성교육 프로그램」은 중국 유아의 지속가능발전지향 창의인성교육에 기여할 것으로 기대된다. The purpose of this study was to develop a sustainable development-oriented creative character education program for young children in China. The Sustainable Development-Oriented Creative Character Education Program for Young Chinese Children was developed through multiple phases of investigation. They included problem analysis and planning in the first stage, information collection and integration in the second stage, program design in the third stage, initial development of the program in the fourth stage, and evaluation and revision of the program development in the fifth and final stage. The findings of this study were as follows: First, the intervention components and development principles of the program were developed based on interviews and on-site surveys. The original program was designed as well based on written evaluations of curriculum experts in China. The program was organized through initial program development and preliminary research, and then was carried out through 18 sessions over eight weeks of private kindergartens in Beijing, China. Second, as a result of the application of the program, the Sustainable Development-Oriented Creative Character Education Program for Young Chinese Children had a positive effect on the improvement of creativity and character of the experimental group. It is expected that the Sustainable Development-Oriented Creative Character Education Program for Young Chinese Children will contribute to improving young children’s creativity and desirable character for Chinese young children.

Model predictive pulse pattern control of permanent magnet synchronous motors for medium‑ and low‑speed optimization

Yueqing Zhao,Taiqiang Cao,Guangxu Pan,Jin Dai,Xiaoying Guo,Min Zheng,Xuan Lin 전력전자학회 2023 JOURNAL OF POWER ELECTRONICS Vol.23 No.9

Taking the permanent magnet synchronous motor (PMSM) as the research object, the model prediction pulse pattern control (MP3C) of a PMSM running in the medium–low-speed zone is adopted to further reduce the torque ripple and phase current total harmonic distortion (THD) of a motor running in the medium–low-speed zone. First, the objective function of the predictive pulse control method is optimized. The objective function is intended to be the difference between the switching voltage vector and the equivalent reference voltage vector. At the same time, the integral of the difference between the d-axis current reference value and the actual value is compensated into the voltage reference vector. Thus, the pulse pattern control selected by the objective function is optimal when the motor is running in the medium–low-speed region. In addition, the PMSM can run stably and reliably. Simulation results show that the torque ripple is reduced by 1.3 Nm and 1.2 Nm, and that the phase current total harmonic distortion is reduced by 0.10% and 0.03% when the motor is running at 5 Nm and 10 Nm and at a speed of 100 rpm, respectively. When the rotation speed is 1000 rpm, the torque ripple is reduced by 0.74 Nm and 0.78 Nm respectively. In addition, the phase current total harmonic distortion is decreased by 0.44% and 0.54%, respectively.

Fundamental Issues Related to the Origin of Melatonin and Melatonin Isomers during Evolution: Relation to Their Biological Functions

Tan, Dun-Xian,Zheng, Xiaodong,Kong, Jin,Manchester, Lucien C.,Hardeland, Ruediger,Kim, Seok Joong,Xu, Xiaoying,Reiter, Russel J. MDPI 2014 INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES Vol.15 No.9

<P>Melatonin and melatonin isomers exist and/or coexist in living organisms including yeasts, bacteria and plants. The levels of melatonin isomers are significantly higher than that of melatonin in some plants and in several fermented products such as in wine and bread. Currently, there are no reports documenting the presence of melatonin isomers in vertebrates. From an evolutionary point of view, it is unlikely that melatonin isomers do not exist in vertebrates. On the other hand, large quantities of the microbial flora exist in the gut of the vertebrates. These microorganisms frequently exchange materials with the host. Melatonin isomers, which are produced by these organisms inevitably enter the host’s system. The origins of melatonin and its isomers can be traced back to photosynthetic bacteria and other primitive unicellular organisms. Since some of these bacteria are believed to be the precursors of mitochondria and chloroplasts these cellular organelles may be the primary sites of melatonin production in animals or in plants, respectively. Phylogenic analysis based on its rate-limiting synthetic enzyme, serotonin <I>N</I>-acetyltransferase (SNAT), indicates its multiple origins during evolution. Therefore, it is likely that melatonin and its isomer are also present in the domain of archaea, which perhaps require these molecules to protect them against hostile environments including extremely high or low temperature. Evidence indicates that the initial and primary function of melatonin and its isomers was to serve as the first-line of defence against oxidative stress and all other functions were acquired during evolution either by the process of adoption or by the extension of its antioxidative capacity.</P>