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High-performance sodium storage for cobalt phosphide composite array electrodes

Rare Metals 2024年第8期43卷 3724-3734页

作者： man Zhang Xiao-Xu Liu Tian-Yi Ji Yang Li Da-Wei sheng Shao-dong Li Pei-Pei Ren Ze-Xiang Shen School of Material Science and Engineering Shaanxi University of Science and TechnologyXi'an 710021China School of Physical and Mathematical Sciences Nanyang Technological UniversitySingapore 637371Singapore

Transition metal phosphides hold great potential as sodium-ion batteries anode materials owing to their high theoretical capacity and modest ***,volume changes and low intrinsic conductivity seriously largely hinder the further development of metal phosphide *** design of phosphide anode materials with reasonable structure is conducive to solving the problems of volume expansion and slow reaction kinetics during the *** this work,a composite material integrating zeolite imidazolate backbone(ZIF) and carbon materials was synthesized by the original growth ***,by the oxidation-phosphating process,CoP nanoarray composites riveted to carbon fiber(CoP@CF) were *** the CoP@CF,CoP nanoparticles are uniformly distributed on ZIF-derived carbon,reducing agglomeration and volume change during *** also provides a highly conductive network for the active material,improving the electrode ***,when evaluated as an anode for sodium-ion batteries,CoP@CF electrode displays enhanced reversible capacity(262 mAh·g^(-1) at 0.1 A·g^(-1)after 100 cycles),which is much better than that of pure CF electrode(57 mAh·g^(-1) at 0.1 A·g^(-1) after 100 cycles)prepared without the addition of *** rate performance of CoP@CF electrode is also superior to that of pure CF electrode at various current densities from 0.05 to1 A·g^(-1).The sodium storage behavior of CoP@CF was revealed by ex-situ X-ray photoelectron spectroscopy,X-ray diffraction,and synchrotron radiation absorption *** method provides a reference for the design and synthesis of anode materials in sodium-ion batteries.

关键词： Cobalt phosphide Array structure Freestanding anodes Sodium-ion batteries

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Variation of soil fertility and carbon sequestration by planting Hevea brasiliensis in Hainan Island, China

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Journal of Environmental Sciences 2007年第3期19卷 348-352页

作者： CHENG Chun-man WANG Ru-song JIANG Ju-sheng Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China Research and Development Center of Hainan State Farm Bureau Haikou 570212 China

The development of rubber industry depends on the sustainable management of rubber plantation. To evaluate the environmental effects of planting Hevea brasiliensis on a subsystem of tropical forest ecosystem, the variation of soil fertility and carbon sequestration under rubber plantation within 30-year life period were investigated in Hainan Island. Results showed that （1） with the increase of stand age of rubber plantation, soil fertility decreased all along. From 1954 to 1995, soil organic matter, total N, available K and available P decreased by 48.2%, 54.1%, 56.7% and 64.1%, respectively. （2） If the complete return of litters was considered without additional fertilizer application to the soil of the rubber plantations, the consumption periods for P, N, K, Mg were only 825 years, 329 years, 94 years and 65 years, respectively~ To improve soil fertility is essential for rubber plantation development. （3） The C sequestration of rubber trees per hectare accounts for 272.08 t within 30-year life period and 57.91% of them was fixed in litters. In comparison with C sequestration by rain forest （234.305 t/hm^2） and by secondary rain forest （150.203 t/hm^2）, rubber forest has more potentials for C fixation. On the base of above results, the following measures would benefit the maintenance of soil fertility and the development of rubber industry, including applying fertilizer to maintain the balance of soil nutrients, intercropping leguminous plant to improve soil fertility, reducing the collection of litters, optimizing soil properties to improve element P availability such as applying CaCO3. The information gathered from the study can be used as baseline data for the sustainable management of rubber plantation elsewhere.

关键词： soil fertility carbon sequestration rubber plantation Hainan Island

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Synthesis and Crystal Structure of a Novel manganese Coordination Polymer Constructed by 3,5-Dimethylbenzoic Acid with 4,4'-Bipyridine

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Chinese Journal of Structural Chemistry 2006年第10期25卷 1213-1216页

作者： ZHANG Chun-Hua CHEN man-sheng KUANG Dai-Zhi Department of Chemistry and Materials Science Hengyang Normal University Hengyang 421008 China

A novel manganese coordination polymer [Mn（L）2（bipy）]n （HL = 3,5-dimethylbenzoic acid, 4,4＇-bipy = 4,4＇-bipyridine） has been synthesized by a hydrothermal method. The molecular and crystal structures were determined by single-crystal X-ray diffraction. The crystal is of monoclinic, space group C2/c with a = 2.0996（8）, b = 1,1835（5）, c = 0.9958（4） nm, β = 110.161（5）°, V = 2,3229（16） nm^3, Z = 4, C28H26MnN2O4, Mr = 509.45, Dc= 1.457 g/cm^3,μ = 0.607 mm^-1, F（000） = 1060, Rim = 0.0566, R = 0.0334 and wR = 0.1078. In the crystal the manganese atom is six-coordinated by two nitrogen atoms from 4,4＇-bipy and four oxygen atoms from 3,5-dimethylbenzolate molecules, completing an octahedral geometry. The 4,4＇-bipy molecules bridge the infinite chain [Mn（L）2（bipy）]n to form a two-dimensional layer.

关键词： manganese coordination polymer hydrothermal synthesis crystal structure

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Wave Energy Resource Availability Assessment in the Philippines Based on 30-Year Hindcast Data

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Journal of Ocean University of China 2023年第2期22卷 349-364页

作者： WANG Zhifeng JIANG dong dong sheng GONG Yijie College of Engineering Ocean University of ChinaQingdao 266100China

With the goal of evaluating the wave and wave energy conditions in the Philippines,the simulated wave nearshore(SWAN)model was used to estimate the wavefield using 30 years of cross-calibrated multi-platform(CCMP)wind field data(1987-2016).The spatiotemporal patterns of annual and monthly averaged significant wave heights and wave energy in the Philippines were analyzed based on the simulated *** showed that they had similar values;in particular,significant wave heights and wave energy were smaller in the south and southwest and higher in the north and northeast.A total of 12 representative points along the Philippine coast were selected to draw wave and wave energy roses.A directional analysis showed that the dominant wave was in the north north-east(NNE),northeast(NE),and east north-east(ENE)*** energy was mainly distributed in regions with an energy period between 1 and 10 s and significant wave heights between 0 and 4 *** better utilize wave energy data in the Philippines,this paper studied the available and rich area of wave energy and analyzed the annual and monthly variability index of wave energy in the ***,the available significant wave heights of wave energy conversion devices(WECs)were set as 0.5-4 m,and the maximum annual average available wave energy occurred in the eastern Philippine Sea area,reaching 13 kW m^(-1).For the safety of WECs,extreme typhoon-induced wave conditions must be ***,the results showed that the maximum significant wave height and mean period over the 50-year return period reached 18 m and 15 s,respectively.

关键词： wave energy resource wave energy availability wave climate extreme parameters

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Uniform Lipschitz Estimates of Homogenization of Elliptic Systems in Divergence Form with Dini Conditions

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Acta Mathematicae Applicatae Sinica 2021年第1期37卷 48-68页

作者： Rong dong dong-sheng LI Hai-liang ZHANG School of Mathematics and Statistics Xi'an Jiaotong UniversityXi'an 710049China Departments of Mathematics Zhejiang Ocean UniversityZhoushan 316022China

The paper is devoted to the homogenization of elliptic systems in divergence *** obtain uniform interior as well as boundary Lipschitz estimates in a bounded C1,γdomain when the coefficients are Dini continuous,inhomogeneous terms are divergence of Dini continuous functions and the boundary functions have Dini continuous *** results extend Avellaneda and Lin’s work[*** ***.,40:803-847(1987)],where Holder continuity is the main assumption on smoothness of the data.

关键词： homogenization elliptic systems uniform Lipschitz estimates Dini conditions

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Occurrence and Identification of the Hydromedusae Sarsia tubulosa(Hydrozoa, Corynidae) in Chinese Coastal Waters

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Journal of Ocean University of China 2018年第6期17卷 1418-1422页

作者： sheng Xiaoyan dong Zhijun National Engineering Research Center of Marine Facilities Aquaculture Zhejiang Ocean University Muping Coastal Environment Research Station Yantai Institute of Coastal Zone Research Chinese Academy of Sciences

Sarsia tubulosa(M. Sars, 1835) belongs to the family Corynidae, and is mainly distributed in coastal boreal and arctic waters. During regular zooplankton sampling in a coastal artificial lake(Lake Fenghuang) near the northern Yellow Sea(36?55?N, 122?24?E) in May 2015, we found high densities of Sarsia sp. in the zooplankton samples. The mean density of the medusae was 50± 40 individuals m^(-3)(mean ± SD). These specimens were characterized by a long tube-like manubrium and were consistent with previous descriptions of S. tubulosa. Furthermore, a molecular phylogenetic analysis of the mitochondrial cytochrome c oxidase I subunit gene fragments revealed that these individuals clustered with S. tubulosa. Therefore, based on both morphological and molecular data, these specimens were identified as S. tubulosa. This report represents the first formal record of S. tubulosa in Chinese coastal waters, which extended its known geographical distribution.

关键词： abundance China hydromedusa medusa mitochondrial DNA morphology

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A Preliminary Study on the Intensity of Cold Wave Storm Surges of Laizhou Bay

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Journal of Ocean University of China 2016年第6期15卷 987-995页

作者： LI Xue dong sheng College of Engineering Ocean University of China

Abstract Dike failure and marine losses are quite prominent in Laizhou Bay during the period of cold wave storm surges because of its open coastline to the north and fiat topography. In order to evaluate the intensity of c01d wave storm surge, the hindcast of ma- rine elements induced by cold waves in Laizhou Bay from 1985 to 2004 is conducted using a cold wave storm surge-wave coupled model and the joint return period of extreme water level, concomitant wave height, and concomitant wind speed are calculated. A new criterion of cold wave storm surge intensity based on such studies is developed. Considering the frequency of cold wave, this paper introduces a Poisson trivariate compound reconstruction model to calculate the joint return period, which is closer to the reality. By using the newly defined cold wave storm surge intensity, the ＇cold wave grade＇ in meteorology can better describe the severity of cold wave storm surges and the warning level is well corresponding to different intensities of cold wave storm surges. Therefore, it provides a proper guidance to marine hydrological analysis, disaster prevention and marine structure design in Laizhou Bay.

关键词： Laizhou Bay cold wave grade Poisson trivariate compound reconstruction model cold wave storm surge intensity

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Effects of automatic variable preload device on performance of spindle

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Journal of Central South University 2012年第1期19卷 150-154页

作者： KIM dong-Hyeon LEE Choon-man Department of Mechanical Design and manufacturing Engineering Changwon National UniversityChangwon 641-773Korea

To increase the machine accuracy by improving the stiffness of bearings,a preload was applied to bearings.A variable preload technology was necessary to perform machining processes in both low and high speed *** automatic variable preload device was fabricated using an eccentric *** installing the fabricated device on a spindle,the effect of the automatic variable preload device on the performance of the spindle was *** the results of the vibration measurement of the spindle,the vibration is increased by 20%-37% according to measurement points at the maximum rotation speed of 5 000 r/***,in the results of the noise measurement of the spindle,the spindle rotation speed is increased by about 1.9% and 1.5% at the front and side of the spindle,*** on the results of this analysis,an improved method that reduces such effects on the performance of the spindle is proposed.

关键词： machine tool spindle automatic variable preload device vibration noise

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Effects of smelting parameters on the slag/metal separation behaviors of Hongge vanadium-bearing titanomagnetite metallized pellets obtained from the gas-based direct reduction process

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International Journal of Minerals,Metallurgy and Materials 2018年第6期25卷 609-622页

作者： Cong Feng man-sheng Chu Jue Tang Zheng-gen Liu School of Metallurgy Northeastern University

Smelting separations of Hongge vanadium-bearing titanomagnetite metallized pellets（HVTMP）prepared by gas-based direct reduction were investigated,and the effects of smelting parameters on the slag/metal separation behaviors were *** mechanisms were elucidated using X-ray diffraction analysis,FACTSAGE 7.0 calculations,and scanning electron microscopy *** results show that,when the smelting temperature,time,and C/O ratio are increased,the recoveries of V and Cr of HVTMP in pig iron are improved,the recovery of Fe initially increases and subsequently decreases,and the recovery of Ti O_2 in slag *** the smelting Ca O/Si O_2 ratio is increased,the recoveries of Fe,V,and Cr in pig iron increase and the recovery of Ti O_2 in slag initially increases and subsequently *** appropriate smelting separation parameters for HVTMP are as follows：smelting temperature of 1873 K;smelting time of 30–50 min;C/O ratio of 1.25;and Ca O/Si O_2 ratio of *** these optimized parameters（smelting time：30 min）,the recoveries of Fe,V,Cr,and Ti O_2 are 99.5%,91.24%,92.41%,and 94.86%,respectively.

关键词： titanomagnetite vanadium chromium metallized pellets smelting separation recovery

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Transferring and Bounding Single Photon in Waveguide Controlled by Quantum Node Based on Atomic Ensemble

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Communications in Theoretical Physics 2009年第9期52卷 500-506页

作者： LU Jing dong Hui KUANG Le-man Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education and Depart- ment of Physics Hunan Normal University Changsha 410081 China Institute of Theoretical Physics Chinese Academy of Sciences Beijing 100080 China

We study the scattering process of photons confined in a one-dimensional optical waveguide by a laser controlled atomic ensemble. The investigation leads to an alternative setup of quantum node controlling the coherent transfer of single photon in such one dimensional continuum. To exactly solve the effective scattering equations by using the discrete coordinate approach, we simulate the linear waveguide as a coupled resonator array at the high energy limit. We generally calculate the transmission eoet^cients and its vanishing at resonance reflects the good controllability of our scheme. We also show that there exist two bound states to describe the localize photons around the cavity.

关键词： one-dimensional waveguide single photon bound states

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