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In situ Raman,FTIR,and xRD spectroscopic studies in fuel cells and rechargeable batteries

Nano Research 2023年第4期16卷 4855-4866页

作者： Fan Gao xiang-Dong Tian Jia-Sheng Lin Jin-Chao Dong xiu-Mei Lin Jian-Feng Li xiamen Cardiovascular Hospital State Key Laboratory of Physical Chemistry of Solid SurfacesCollege of Chemistry and Chemical EngineeringCollege of EnergyXiamen UniversityXiamen 361005China Department of Chemistry and Environment Science Fujian Province University Key Laboratory of Analytical ScienceMinnan Normal UniversityZhangzhou 363000China

As state-of-the-art electrochemical energy conversion and storage(EECS)techniques,fuel cells and rechargeable batteries have achieved great success in the past ***,modern societies’ever-growing demand in energy calls for EECS devices with high efficiency and enhanced performance,which mainly rely on the rational design of catalysts,electrode materials,and electrode/electrolyte interfaces in EESC,based on in-deep and comprehensive mechanistic understanding of the relevant electrochemical redox *** an understanding can be realized by monitoring the dynamic redox reaction processes under realistic operation conditions using in situ techniques,such as in situ Raman,Fourier transform infrared(FTIR),and x-ray diffraction(xRD)*** techniques can provide characteristic spectroscopic information of molecules and/or crystals,which are sensitive to structure/phase changes resulted from different electrochemical working conditions,hence allowing for intermediates identification and mechanisms *** review described and summarized recent progress in the in situ studies of fuel cells and rechargeable batteries via Raman,FTIR,and xRD *** applications of these in situ techniques on typical electrocatalytic electrooxidation reaction and oxygen reduction reaction(ORR)in fuel cells,on representative high capacity and/or resource abundance cathodes and anodes,and on the solid electrolyte interface(SEI)in rechargeable batteries are *** discuss how these techniques promote the development of novel EECS systems and highlight their critical importance in future EECS research.

关键词： in situ spectroscopy Raman Fourier transform infrared spectroscopy(FTIR) x-ray diffraction(xRD) fuel cells rechargeable batteries

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Should peri-gastrectomy gastric acidity be our focus among gastric cancer patients?

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World Journal of Gastroenterology 2014年第22期20卷 6981-6988页

作者： Lei Huang A-Man xu Tuan-Jie Li Wen-xiu Han Jing xu Department of General Surgery the First Affiliated Hospital of Anhui Medical University Department of General Surgery NanFang Hospital of Southern Medical University

AIM: To investigate the necessity and correctness of acid suppression pre- and post-gastrectomy among gastric carcinoma (GC) patients.

关键词： Gastric carcinoma Gastrectomy Reflux Acidity Gastrointestinal juice

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Data-Driven Prediction of Sintering Burn-Through Point Based on Novel Genetic Programming

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Journal of Iron and Steel Research International 2010年第12期17卷 1-5,10页

作者： SHANG xiu-qin LU Jian-gang SUN you-xian LIU Jun yING yu-qian State Key Laboratory of Industrial Control Technology Department o{ Central Science and EngineeringZhejiang University Hangzhou 310027 Zhejiang China

An empirical dynamic model of burn-through point（BTP）in sintering process was *** K-means clustering was used to feed distribution according to the cold bed permeability,which was estimated by the superficial gas velocity in the cold *** each clustering,a novel genetic programming（NGP）was proposed to construct the empirical model of the waste gas temperature and the bed pressure drop in the sintering *** least square method（LSM）and M-estimator were adopted in NGP to improve the ability to compute and resist *** results show the superiority of the proposed method.

关键词： burn-through point genetic programming K-means clustering

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Soil nutrients in relation to vertical roots distribution in the riparian zone of Three Gorges Reservoir,China

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Journal of Mountain Science 2018年第7期15卷 1498-1509页

作者： ZHONG Rong-hua HU Jin-ming BAO yu-hai Wang Fei HE xiu-bin yunnan Key Laboratory of International Rivers and Transboundary Eeo-security Kunming 650091 China Institute oflnternational Rivers and Eco-security Yunnan University Kunming 650091 China Key Laboratory of Mountain Surface Processes and Ecological Regulation Institute of Mountain Hazards and Environment Chinese Academy of Sciences Chengdu 610041 China

Since the impoundment of the Three Gorges Reservoir(TGR), the riparian zone has been subjected to numerous environmental changes. This study was conducted to recognize the distribution of grass roots and its impacts on soil nutrients in the water level fluctuation zone of TGR. Roots of four predominant herbaceous plants in the study area, specifically, Cynodon dactylon, Hemarthria altissima, Hemarthria compressa, and Paspalum paspaloides, and their corresponding relation with soil nutrient contents were investigated. Root surface area density was determined with Win RHIZO, and the relationships of root distribution with soil depths and soil nutrient contents were studied. The results indicates that most roots are distributed in the top soil layer of 0-10 cm. Estimated root surface area density for the selected grass species ranges from 0.16 to 13.44 cm^2/cm^3, and decreases exponentially with an increase in soil depth. Soil organic matter and total nitrogen contents are significantly lower on bare control area than the corresponding values on the grasslands. Total nutrient contents on grasslands of C. dactylon and H. compressa are higher than those of other grass areas. Root length density and root surface area density are significantly correlated with soil organic matter and total nitrogen content for the four grasslands. The present results suggests that plant roots have significant effects on the distribution of soil nutrients in soil profiles in the riparian zone along the TGR. Nevertheless, additional investigations are needed to reveal the specific interactions between plant roots distribution, soil nutrients and water level fluctuations.

关键词： Roots distribution Soil nutrients Water level fluctuations Riparian zone Root surface area density Root length density

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The relative changes of a sea surface temperature in the South China Sea since the Pliocene

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Acta Oceanologica Sinica 2019年第3期38卷 78-92页

作者： Dongjie Bi Daojun Zhang Shikui Zhai xinyu Liu Chun xiu xiaofeng Liu Aibin Zhang Key Laboratory of Submarine Geosciences and Prospecting Techniques of Ministry of Education College of Marine Geosciences Ocean University of China Zhanjiang Branch Institute of China National Offshore Oil Corporation (CNOOC) Limited

The reconstruction of sea surface temperature(SST) is a key issue in research on paleoceanography. The recently related studies are mainly concentrated on the Quaternary. The skeletons of a typical species of benthonic foraminifer(Amphistegina radiata) in the top 0–375.30 m interval of Well "xike-1" reef core, Shidao Island, the xisha Islands, are uniformly selected. The ratios of magnesium to calcium concentrations and other indicators are analyzed by an electron microprobe analysis(EMPA) with the purpose of estimating the paleo-SSTs since the Pliocene and further investigating the periodic change law of paleoclimate in the South China Sea(SCS).Meanwhile, the geologic significance of paleoclimatic events in the SCS is discussed with global perspectives. The results indicate that the paleo-SSTs reconstructed by the ratios of magnesium to calcium concentrations in the SCS show a general periodic trend of "high–low–high–low" in values changes since the Pliocene. By comparison,the fluctuations of reconstructed paleo-SSTs are much stronger in the Quaternary. Moreover, the variations of the ratios of magnesium to calcium concentrations in the A. radiata skeletons have recorded a series of major paleoclimatic events since the Pliocene, of which the Quaternary glaciation events and the Arctic ice cap forming events during the late Pliocene are more significant. Thus, using the changes of the ratios of magnesium to calcium concentrations in the A. radiata skeletons from Well "xike-1" reef core to reflect the relative changes of paleo-SSTs is a relatively feasible and reliable way in the SCS, which is also proved by the correlation of drilling cores characteristics in this area.

关键词： the ratios of magnesium to calcium concentrations benthonic foraminifera sea surface temperature paleoclimatic events

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Optimization of electrical parameters for micro-arc oxidation of zirconium hydride alloy

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Rare Metals 2022年第7期41卷 2324-2330页

作者： Zhi-Gang Wang Wei-Dong Chen Shu-Fang yan xiu-Juan Fan Feng Guo Zhi-Gao xu College of Materials and Engineering Inner Mongolia University of TechnologyHohhot 010051China Division of Mineral Resources Metallurgy and MaterialsGeneral Research Institute for Nonferrous MetalsBeijing 100088China Key Laboratory for Green Chemical Process of Ministry of Education Wuhan Institute of TechnologyWuhan 430073China

The present work aims to present the micro-arc oxidation(MAO)zirconia coating with superior compact-ness and moderate thickness on zirconium *** experiments were designed according to L16(44)orthog-onal array to optimize electrical parameters(frequency,negative voltage,positive voltage and MAO time),with four levels of each *** optimized value was pre-dicted and verified by the confirmation *** anti-permeation effect was tested by means of vacuum dehydrogenation *** optimized coating parameters are listed as follows:treating time of 25 min,frequency of 200 Hz,negative voltage of 150 V and pos-itive voltage of 380 *** results show that the optimized coating exhibits the highest compactness of 0.3705 mg·μm^(-1).This dense coating significantly enhan-ces the hydrogen anti-permeation effects,and the PRF value is improved by nearly 13 times in contrast with that of uncoated ZrH_(1.8).

关键词： coating alloy zirconium

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Scheme for Implementation of Ancillary-Free 1→3 Optimal Phase-Covariant Quantum Cloning with Trapped Ions

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Communications in Theoretical Physics 2008年第6期49卷 1499-1501页

作者： yANG Rong-Can LI Hong-Cai LIN xiu HUANG Zhi-Ping xIE Hong School of Physics and Opto-Electronics Technology Fujian Normal University Fuzhou 350007 China

We propose a simple scheme for the implementation of the ancillary-free 1→3 optimal phase-covariant quantum cloning for x-y equatorial qubits in ion-trap system. In the scheme, the vibrational mode is only virtually excited, which is very important in view of decoherence. The present proposal can be realized based on current available technologies.

关键词： ancillary-free phase-covariant quantum cloning trapped ions

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Determination of the Toxicities of 16 Halogenated Benzenes to Photobacterium Phosphoreum and 2D- and 3D-QSAR Studies

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Chinese Journal of Structural Chemistry 2010年第7期29卷 1007-1014页

作者： CAO Si-Tong WANG xiu LIU Hong-xia yANG Guo-ying WANG Zun-yao Garment andArt Design College Jiaxing University Jiaxing Zhefiang 314001 China Biological and Chemical Engineering College Jiaxing Zhejiang 314001 China

In this paper we take photobacterium phosphoreum （T3） as the experimental bacteria, and determine the half-inhibitory concentration （-1gEC50） against the photobacterium phosphoreum of 16 halogenated benzenes. Using B3LyP method of DFT in the Gaussian 03 program, we obtain the structural and thermodynamic descriptors of 16 halogenated benzenes by fully-optimized calculation at the 6-311G＊＊ level. Taking the structural and thermodynamic descriptors as theoretical descriptors, the 2D QSAR model （R2 = 0.983） was established, which can be utilized to predict -lgEC50 of halogenated benzene according to the corrected linear solvation energy theory based on the experimental data of-lgECs0. In addition, the relationship between the toxicity and 3D spatial structure of the compound is studied by comparing the molecular similarity index analysis （CoMSIA） of 3D-QSAR method. By cross validation, the correlation coefficient q2 of CoMSIA model is 0.687, and the conventional correlation coefficient R2 = 0.958. The model is stable and reliable with great predictive ability. The 3D-QSAR model shows that the toxicity of halogenated benzene compound is mainly affected by the characteristics of hydrophobie field of the substituted halogens.

关键词： halogenated benzene toxicity (-lgEC50) DFT QSAR

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Long Term Sea Level Change and Water Mass Balance in the South China Sea

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Journal of Ocean University of China 2009年第4期8卷 327-334页

作者： RONG Zengrui LIU yuguang ZONG Haibo xiu Peng Physical Oceanography Laboratory Ocean University of China Qingdao 266100 P. R. China

Sea level anomalies observed by altimeter during the 1993-2006 period, thermosteric sea level anomalies estimated by using subsurface temperature data produced by Ishii and SODA reanalysis data, tide gauge records and HOAPS freshwater flux data were analyzed to investigate the long term sea level change and the water mass balance in the South China Sea, The altime- ter-observed sea level showed a rising rate of （3.5±0.9）mmyr-1 during the period 1993-2006, but this figure was considered to have been highly distorted by the relatively short time interval and the large inter-decadal variability, which apparently exists in both the thermosteric sea level and the observed sea level. Long term thermosteric sea level from 1945 to 2004 gave a rising rate of 0.15±0.06 mmyr-1. Tide gauge＇data revealed this discrepancy and the regional distributions of the sea-level trends. Both the ＇real＇ and the ther- mosteric sea level showed a good correspondence to ENSO： decreasing during El Nino years and increasing during La Nina years. Amplitude and phase differences between the ＇real＇ sea level and the thermosteic sea level were substantially revealed on both sea- sonal and interannual time scales. As one of the possible factors, the freshwater flux might play an important role in balancing the water mass.

关键词： sea level change South China Sea thermosteric sea level mass exchange

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Determination of zidovudine using anion exchange chromatography with integrated pulsed amperometric detection

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Chinese Chemical Letters 2012年第6期23卷 715-718页

作者： yu Chen yu xiu Liu Zhi Dong Chen Mei Lan Chen yan Zhu Hangzhou Vocational and Technical College Hangzhou 310018 China School of Chemistry and Chemical Engineering Changzhou University Changzhou 213164 China College of Biology and Envinonment Engineering. Zhejiang Shuren University l-langzhou 310015 China Department of Chemistry Zhejiang University Hangzhou 310028 China

A rapid and practical method for direct detection of zidovudine in high performance anion exchange chromatography （HPAEC） has been developed with integrated pulsed amperometric detection （IPAD）. Dionex AS18 （250mm × 2mm） and AG18 （50 mm× 2 mm） columns and 11 mmol/L NaOH solution were used for separation. Multi-step potential waveform parameters were optimized to maximize the signal-to-noise ratio （S/N）. Utilizing an optimized waveform, the repeatability （intra-day） precision and intermediate （inter-day） precision are obtained with relative standard deviation （RSD） of 1.88, 2.27, respectively. The limit of quantification （LOQ） and limit of detection （LOD） were found to be 9.70, 3.0 ng/mL, respectively, with correlation coefficients of 0.9992 over concentration range 0.01-10 μg/mL. The present method was successfully applied to the determination of zidovudine in human plasma. The recoveries of plasma sample spiked by 0.7 μg/mL, 2.7 μg/mL obtained were 95.3-101.5%, with relative standard deviation （RSD） of 2.54%, 2.21%, respectively.

关键词： Zidovudine AIDS Integrated pulsed amperometry High performance anion exchange chromatography Plasma

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