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Highly-sensitive Detection of Salvianolic Acid B using Alumina Microfibers-modified Electrode
Dong Sun,Xiaoyong Zheng,Xiafeng Xie,Xiaofeng Yang,Huajie Zhang 대한화학회 2013 Bulletin of the Korean Chemical Society Vol.34 No.11
Alumina microfibers with porous structures were prepared through hydrothermal reaction, and then used to modify the surface of carbon paste electrode (CPE). After modification with alumina microfibers, the electrochemical activity of CPE was found to be greatly improved. On the surface of alumina microfibersmodified CPE, the oxidation peak current of salvianolic acid B, a main bioactive compound in Danshen with anti-oxidative and anti-inflammatory effects, was remarkably increased compared with that on the bare CPE surface. The influences of pH value, amount of alumina microfibers and accumulation time were studied. Based on the strong signal amplification effects of alumina microfibers, a novel electrochemical method was developed for the detection of salvianolic acid B. The linear range was from 5 μg L−1 to 0.3 mg L−1, and the detection limit was 2 μg L−1 (2.78 nM) after 1-min accumulation. The new method was successfully used to detect salvianolic acid B in ShuangDan oral liquid samples, and the recovery was over the range from 97.4% to 102.9%.
Electrochemical properties of Bi-Ni and Bi-Ni-Mn composite-coated electrolytic manganese dioxide
Xiaofeng Li,Zhigang Huang,Tongchi Xia,Huichao Dong,Yanghua Song 한국화학공학회 2014 Korean Journal of Chemical Engineering Vol.31 No.6
The Bi-Ni and Bi-Ni-Mn composite is separately coated on the surface of commercial electrolytic manganesedioxide (EMD) by using a simple chemical precipitation/oxidation method. The results of X-ray diffractionshow that a structure of γ-MnO2 is kept for all the coated EMD, but the intensity of their diffraction peaks is lower thanuncoated one. Both the Bi0.5-Ni0.5 and Bi0.35-Ni0.35-Mn0.3 composite benefits the discharge capacity and high-power performanceof the EMD electrodes. On the other hand, the results of scanning electron microscopy and energy dispersivespectroscopy confirm the more uniform distribution of the Bi0.15-Ni0.55-Mn0.3 composite on the surface of EMD thanthe Bi0.5-Ni0.5 one, thereby resulting in better cyclability of the electrodes. After 50 cycles at a 1C rate, the capacity retentionrate of the Bi0.15-Ni0.55-Mn0.3 composite-coated electrode reaches to 80%, which is far larger than the un-coated(49%) and the Bi0.5-Ni0.5 composite-coated (63%) one.
Highly-sensitive Detection of Salvianolic Acid B using Alumina Microfibers-modified Electrode
Sun, Dong,Zheng, Xiaoyong,Xie, Xiafeng,Yang, Xiaofeng,Zhang, Huajie Korean Chemical Society 2013 Bulletin of the Korean Chemical Society Vol.34 No.11
Alumina microfibers with porous structures were prepared through hydrothermal reaction, and then used to modify the surface of carbon paste electrode (CPE). After modification with alumina microfibers, the electrochemical activity of CPE was found to be greatly improved. On the surface of alumina microfibers-modified CPE, the oxidation peak current of salvianolic acid B, a main bioactive compound in Danshen with anti-oxidative and anti-inflammatory effects, was remarkably increased compared with that on the bare CPE surface. The influences of pH value, amount of alumina microfibers and accumulation time were studied. Based on the strong signal amplification effects of alumina microfibers, a novel electrochemical method was developed for the detection of salvianolic acid B. The linear range was from 5 ${\mu}gL^{-1}$ to 0.3 mg $L^{-1}$, and the detection limit was 2 ${\mu}gL^{-1}$ (2.78 nM) after 1-min accumulation. The new method was successfully used to detect salvianolic acid B in ShuangDan oral liquid samples, and the recovery was over the range from 97.4% to 102.9%.
The Investigation of Function of Mineral Mud for the Skin
Yijie Du,Xiaofeng Deng,Li Li,Yinmao Dong 한국피부과학연구원 2016 아시안뷰티화장품학술지 Vol.14 No.1
목적: 본 연구는 미네랄머드가 류머티스성 질환, 건선 등 질병에 민간적 응용과 임상적 응용으로 많이 사용됨에 따 라 미네랄머드의 피부 임상응용을 목적으로 연구를 진행하였다. 방법: 미네랄머드의 소염, 항산화 작용을 요약하고, 미네랄머드를 화장품에 응용함에 있어서 존재하는 문제를 발 견하고 화장품영역에서의 발전방향을 제시하였다. 결과: 류머티스성 질환, 건선 등 난치 성 피부병의 치료는 미네랄머드의 소염, 항산화작용에 의한 것으로 보인다. 결론: 미네랄머드가 화장품 소재로서의 희망적인 가능성을 가지고 있지만 화장품 완제품으로 개발하기 위해서는 아직도 해결해야 할 여러 문제점들이 있다고 사료된다. Purpose: The treatment of mineral mud in rheumatic disease, psoriasis and other disease has been widely recognized in clinic application. We aim to explore the effect of mineral mud on the skin through it clinic application. Methods: We summarize the function of mineral mud in anti-inflammation, anti-oxidation, et al and point out the existing in the application of mineral mud in cosmetics and its development status. Results: Mineral mud have positive effects on rheumatic diseases through its properties of anti-inflammatory and anti-oxidation. Conclusion: The results demonstrate that mineral mud had a good prospect in cosmetics, but there are still many problems to be solved.
Female migrants in China: Second child fertility behavior and employment stability
Li Hu,Dong Chenyu,Wang Xiaofeng 이화여자대학교 아시아여성학센터 2022 Asian Journal of Women's Studies(AJWS) Vol.28 No.1
Researchers have found a negative relationship between female fertility and employment. China’s floating population comprises 244 million as of 2017. This migrant population has relevance in view of China’s hukou (household registration) system, with the proportion of females increasing annually. This study is grounded in social role theory and employs the 2016 China Migrants Dynamic Survey (CMDS) to examine the impact of second child fertility behavior on the employment stability of female migrants in China, with respect to urban and rural differences. Binary logistic regression results indicate that bearing second children negatively affects the employment stability of female migrants. Also, its impact is stronger for female migrants of urban origin than their rural counterparts. In addition, family migration is noted to mitigate the conflict between childbearing and employment stability for them as they continue to face the dilemma of having children or seeking employment stability, especially if family and social support is weak or absent. We discuss the implications of this study on policy changes to alleviate the conflict female migrants experience in choosing between fertility and employment.
Rossi, Daniel,Wang, Hua,Dong, Yitong,Qiao, Tian,Qian, Xiaofeng,Son, Dong Hee American Chemical Society 2018 ACS NANO Vol.12 No.12
<P>We report the strong light-induced activation of forbidden exciton transition in CsPbBr<SUB>3</SUB> perovskite quantum dots mediated by the symmetry-breaking polaron that modifies the optical selection rule of the confined exciton transition. The activated forbidden transition results in an intense pump-induced absorption in the transient absorption spectra above the bandgap, where the original parity-forbidden transition was located. In contrast to many other semiconductor quantum dots, photoexcitation of an exciton in CsPbBr<SUB>3</SUB> quantum dots creates a sufficiently large perturbation <I>via</I> a lattice-distorting polaron, which turns on the formally forbidden transition. Compared to the bulk or weakly confined CsPbBr<SUB>3</SUB>, the activation of the forbidden transition in strongly confined quantum dots is much more prominent due to the stronger influence of the polaron on exciton transitions in the confined space. This nonlinear optical property highlights the intimate coupling of the photoexcited charge carriers with the lattice in the CsPbBr<SUB>3</SUB> quantum dots, allowing access to the forbidden exciton transitions with light.</P> [FIG OMISSION]</BR>
( Wang Qiang ),( Shu Yuquan ),( Dong Minhua ),( Xu Ji ),( Tao Xiaofeng ) 한국인터넷정보학회 2015 KSII Transactions on Internet and Information Syst Vol.9 No.5
Instantaneous relay (relay-without-delay) using interference alignment is a promising approach to neutralizing interference and improving system capacity. In Wang Chenwei`s work, a 2-user scenario required both source and relay to access the global channel state information (CSI). This paper shows a new method of interference alignment improves the degrees of freedom (DoF) prominently for the 3-user MIMO interference channel with instantaneous relay. This new method is focused on the relay node that completes the alignment interference neutralization so the global CSI is obtained only once and the pressure on the base station can be mitigated. In addition, the 3-user MIMO interference channels with instantaneous relay can achieve 2M DoF when source and destination have M antennas, respectively. This method shows 33% improvement over the conventional method using interference alignment which obtains 3M/2 DoF.
Dongbo Mi,Jinhaojie Cui,Siliang Kuang,Xiaofeng Dong,Haiyan Lu 대한화학회 2021 Bulletin of the Korean Chemical Society Vol.42 No.3
Water radical cations, (H2O)n+?, have attracted considerable attention owing to their potential practical applications in analytical chemistry, structural chemistry, radiotherapy, and radiochemistry. Recently, atmospheric pressure chemical ionization has emerged as a versatile method for direct mass spectrometric analysis. Usually, H3O+ is the major proton donor during ionization and only the pseudo molecular ion peaks, instead of molecular ions are detected. In this work, (H2O)2+? ions with high oxidizability and reactivity were generated using hydrothermally grown TiO2 nanoneedle arrays in combination with a linear ion trap mass spectrometer under low operating voltage and applied to the direct mass spectrometric analysis of a mixture of volatile aromatic hydrocarbons. (H2O)2+? ions were generated with a high absolute ion current of up to 1.07???105?counts/s at atmospheric pressure. Using the generated (H2O)2+? as the primary ion permitted the tandem mass spectrometric analysis of a mixed vapor sample of aromatic hydrocarbons.