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Recent advanced development of stabilizing sodium metal anodes

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Green Energy & Environment 2023年第5期8卷 1279-1307页

作者： liyu Zhu yucheng li Jingyang Zhao Jing liu Luying Wang Jiandu Lei Beijing Key Laboratory of lignocellulosic Chemistry Beijing Forestry UniversityBeijing100083China MOE Engineering Research Center of Forestry Biomass Materials and Bioenergy Beijing Forestry UniversityBeijing100083China

As the application of next-generation energy storage systems continues to expand,rechargeable secondary batteries with enhanced energy density and safety are imperative for energy ***-ion batteries(SIBs)have attracted extensive attention and are recognized as ideal candidates for large-scale energy storage due to the abundant sodium resources and low *** metal anodes(SMAs)have been considered as one of the most attractive anode materials for SIBs owing to their high specific capacity(1166 mAh g^(-1)),low redox potential,and abundant natural ***,the uncontrollable dendrite growth and inevitable side reactions on SMA lead to the continuous deterioration of the electrochemical performance,causing serious safety concerns and limiting their practical application in the ***,the construction of stable dendrite-free SMAs is a pressing problem for advanced sodium metal batteries(SMBs).In this review,we comprehensively summarize the research progress in suppressing the formation of sodium dendrite,including artificial solid electrolyte interphase(SEI),liquid electrolyte modification,three-dimensional(3D)host materials,and solid-state ***,key aspects and prospects of future research directions for SMAs are *** hope that this timely review can provide an overall picture of sodium protection strategies and stimulate more research in the future.

关键词： Sodium-metal battery Sodium metal anode Dendrite growth Artificial solid electrolyte interphases Electrolyte engineering

Identical carbon isotope trends of carbonate and organic carbon and their environmental significance from the Changhsingian (end-Permian), Meishan, South China

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Chinese Journal Of Geochemistry 2011年第4期30卷 496-506页

作者： li yucheng liU Wenhui WANG Wanchun ZHENG Jianjing Laboratory of Environmental Biogeochemlstry School of Resources and Environmental Engeneering Anhui University Hefei 230039 China Wuxi Institute of Petroleum Geology SINOPEC Wuxi 214151 China Key Laboratory of Petroleum Resources Research Institute of Geology and Geophysics Chinese Academy of Sciences Lanzhou 730000 China

High resolution carbon isotope analyses of carbonate and organic carbon from Meishan, South China showed that the variation of δ13Ccarb is marked by three large positive excursions during the Changhsingian (end-Permian). Carbon isotope stratigraphy during this stage shows three cyclic intervals in δ13Ccarb, with two cycles corresponding to the lower (Paleofusulinid minima Zone) and one corresponding to the upper Changhsingian (P. sinensis Zone). The large positive δ13Ccarb excursions indicate episodes of enhanced burial of isotopically light or-ganic carbon, presumably in response to deep-water anoxia episodically extending into shallow water with the rise of sea level. The organic carbon during the Changhsingian is distinguished into two groups, and the δ13Corg of each group parallels (separately) the more detailed profile of δ13Ccarb, strongly showing that the values of fractionation Δ13Ccab-org remain relatively constant, with only two intervals with anomaly. The enhanced fractionation Δ13Ccab-org with large negative δ13Corg excursions apparently indicates significant inputs from sulfide-oxidizing bacteria and green sulfur bacteria, notably at bed 24 just predating mass extinction. Our evidence appears to support that the ex-tended euxinic water is possible for the main pulse of mass extinction at the end-Permian.

关键词：有机碳同位素二叠纪末碳酸盐岩中国南方环境意义硫化物氧化细菌同位素地层学同位素分析

Application of VOF in Calculating Wave Energy Loss due to Spilling Breaker

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China Ocean Engineering 1995年第1期10卷 101-106页

作者： Dong, Gunhai li, yucheng Wang, Yongxue

A large amount of experimental analysis and systematical theoretical calculation has been done by the authors to solve the problem of wave transformation and breaking, considering the effect of both current and topography, but only the wave energy loss due to spilling breaker in the surf zone has been discussed in this paper. Based on test result analysis and calculation with the Stream Function Wave Theory, the wave velocity field at breaking points has been obtained, and it is used to calculate the wave heights after breaking by the VOF (Volume of Fluid) method, in which the governing equations are continuity equation and Navier-Stokes Equation for imcompressible fluids. In the present paper, the improved VOF technique is used to calculate the wave heights of stable regular waves after breaking. Results fit the test data well, which shows that the VOF method is suitable to numerical simulation of regular waves after breaking. Besides, the breaker coefficient B of regular waves in the bore model is also calculated.

关键词： wave transformation wave breaking wave energy

MULTIPliCATION OPERATORS ON WEIGHTED DIRICHLET SPACES

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Acta Mathematica Scientia 2024年第6期44卷 2225-2248页

作者： Kaikai HAN yucheng li Maofa WANG School of Statistics and Mathematics Hebei University of Economics and BusinessShijiazhuang 050061China School of Mathematical Sciences Hebei Normal UniversityShijiazhuang 050024China School of Mathematics and Statistics Wuhan UniversityWuhan 430072China

In this paper,we study multiplication operators on weighted Dirichlet spaces D_(β)(β∈R).Let n be a positive integer and β∈R,we show that the multiplication operator M_(z)^(n) on D_(β) is similar to the operator ⊕_(1)^(n)M_(z)on the space⊕_(1)^(n)D_(β).Moreover,we prove that M_(z)^(n)(≥2)on Dβis unitarily equivalent to ⊕_(1)^(n)M_(z) on⊕_(1)^(n)D_(β) if and only if β=*** addition,we completely characterize the unitary equivalence of the restrictions of M_(z)^(n) to different invariant subspaces z^(k)D_(β)(k≥1),and the unitary equivalence of the restrictions of M_(z)^(n) to different invariant subspaces S_(j)(0≤jlinear *** characterized the commutant A′( M_(z)^(n))of M_(z)^(n)on a family of analytic function spaces A_(α)^(2)(α∈R)on D(in fact,the family of spaces A_(α)^(2)(α∈R)is the same with the family of spaces D_(β)(β∈R))in terms of the multiplier algebra of the underlying function *** this paper,we give a new characterization of the commutant A′( M_(z)^(n))of M_(z)^(n)on D_(β),and characterize the self-adjoint operators and unitary operators in A'(M_(z)^(n)).We find that the class of self-adjoint operators(unitary operators)in A'(M_(z)^(n))when β≠0 is different from the class of self-adjoint operators(unitary operators)in A′( M_(z)^(n))when β=0.

关键词： multiplication operator weighted Dirichlet space similarity unitary equivalence commutant

The wave transformation and breaking phenomena in shallow water

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Acta Oceanologica Sinica 1996年第2期15卷 261-272页

作者： li yucheng(Dalian University of Technology, Dalian 116023, China) Dalian University of Technology Dalian 116023 China

Based on the principle of wave action flux conservation, the following problems are analyzed in the present study:the transformation of wave and wave spectrum in currents, the change of current velocity profile alongside water depth due to the existence of waves, the breaking criteria of irregular waves, a new hybrid method for the analysis of wave transformation and breaking on slope, the VOF mehtod for calculating broken waves and the transformation of directional wave spectrum in currents.

关键词： Wave transformation wave breaking directional wave spectrum

RECENT SEAWALL CONSTRUCTION IN COASTAL ZONE OF SHANGHAI

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China Ocean Engineering 1989年第4期4卷 467-476页

作者： li, yucheng Zhong, Qiquan Zhang, Shiming Quan, Xuyi Zheng, Jianwu Dalian Univ of Technology China

A typical example of the seawall construction for industrial use in China - the seawall construction for Shanghai Petrochemical Complex (SPC) - is introduced in this paper. The complex is a big modern complex of petrochemical and fabric product. It is located in the new southern suburb of Shanghai along the northern coast of the estuary of the Qiantang River. The beach slope in this region is very gentle, approximately 3.9% to 6% and covered with fine sand. This region is famous for the strong surge, high tidal level, strong current, high sediment concentration as well as strong typhoon attack. This is also the first attempt for Chinese engineers to build such long seawalls for industrial use.

关键词： Water Waves Pressure Effects

A smart MXene-copolymeric molecularly imprinted hydrogel with dual-response and photothermal conversion performance for specific recognition of cis-diol compounds

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Nano Research 2022年第3期15卷 2764-2772页

作者： Jingyang Zhao yucheng li Huatai Zhu Guifang li lingling Kang Jing liu Jing He Jiandu Lei Luying Wang Qiong Yan Beijing Key Laboratory of lignocellulosic Chemistry College of Material Science and TechnologyBeijing Forestry UniversityBeijing 100083China School of Science Beijing Jiaotong UniversityBeijing 100044China MOE Engineering Research Center of Forestry Biomass Materials and Bioenergy Beijing Forestry UniversityBeijing 100083China

In this work,a novel MXene-copolymeric molecularly imprinted hydrogel(FMMIH)with temperature/pH dual response and photothermal conversion performance for selective recognition of cis-diol compounds is successfully *** MXene becomes an important part of the hydrogel’s skeleton by participating in the free radical polymerization ***,FMMIH exhibits improved mechanical properties and great photothermal conversion ***,based on the temperature/pH dual response,FMMIH can realize the controllable capture and release of ginsenoside Rb1 with cis diol structures through dual recognitions of functional groups and geometric *** the conditions of pH 8.5 and 25℃,the adsorption capacity of FMMIH is 26.3 mg·g^(-1) and the imprinting factor is 16.4,showing a good imprinting *** is worth noting that the volume shrinkage caused by photothermal conversion of the hydrogel is conducive to the elution of template molecules and greatly saves the time of desorption(the desorption efficiency is as high as 89.4%under light conditions for 30 min,which is 3.7 times in dark conditions).These excellent properties make it possible to have broad prospects in many fields such as separation of cis-diol compounds,drug delivery systems,and biosensors.

关键词： functional MXene photothermal conversion molecular imprinting temperature/pH response specific recognition

FORCES ON CYliNDERS IN COEXISTING FIELD OF REGULAR WAVES AND CURRENTS

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China Ocean Engineering 1990年第1期5卷 43-54页

作者： li yucheng and Zhang Chunrong Professor,Dalian University of Technilogy, Dalian Master, Dalian University of Technology, Dalian Dalian Univ of Technilogy

Based on the linear wave theory, the lift force on the cylinder under the action of both regular waves and currents related to inline force and the resultant force has been investigated. The relationship between the hydrodynamic coefficients of resultant force Cf, of drag force Cd, of inertia force Cm and of lift force CL and the redefined KC number is reported. It is indicated that in a certain region of KC number, the influence of lift force on the resultant force can not be ignored.

关键词： FORCES ON CYliNDERS IN COEXISTING FIELD OF REGULAR WAVES AND CURRENTS

WAVE CURRENT FORCE COEFFICIENTS ON INCliNED CYliNDER AND A NEW ESTIMATION METHOD

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China Ocean Engineering 1990年第3期5卷 283-296页

作者： Teng Bin and li yucheng Research Assistant, Dalian University of Technology, Dalian Professor, Dalian University of Technology, Dalian Dalian Univ of Technology

Based on the review of present force coefficients estimation methods, a new method in the frequency domain, revised cross-spectrum estimation method, is presented in this paper. Some experiments on the wave-current force on inclined cylinders are also described and the wave current force coefficients are estimated by the revised cross-spectrum estimation method. From the results, it is found that the wave and current directions have some regular effect on the coefficients. According to the results, some empirical formulas are obtained for converting the wave-current force coefficients on inclined cylinders into a unified coefficient. Comparisons show that the unified coefficients are in good agreement with other results.

关键词： WAVE CURRENT FORCE COEFFICIENTS ON INCliNED CYliNDER AND A NEW ESTIMATION METHOD Mean