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Journal of Computational Mathematics 2001年第3期19卷 323-326页

作者： Qi-ding zhu Qun Lin Institute of Science Hunan Normal UniversityChangsha 410081China Institute of System Academy of Mathematics and Systems SciencesChinese Academy of SciencesBeijing 100080China

The post-processing procedure is given by a interpolant postprocessing of the finit element solution by appropriately-define finite dimensional subspaces, The corresponding superconvergence are established on general ... 详细信息

关键词： finite element superconvergence interpolant postprocessing

Improved Upper Bound for Generalized Acyclic Chromatic Number of Graphs

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Acta Mathematicae Applicatae Sinica 2018年第4期34卷 798-800页

作者： Jian-sheng CAI Xu-ding zhu School of Mathematics and Information Sciences Weifang University Weifang 261061 China Department of Mathematics Zhejiang Normal University Jinhua 321004 China

A vertex coloring of a graph G is called r-acyclic if it is a proper vertex coloring such that every cycle D receives at least min{｜D｜, r} colors. The r-acyclic chromatic number of G is the least number of colors in an r-acyclic coloring of G. We prove that for any number r ≥ 4, the r-acyclic chromatic number of any graph G with maximum degree △ ≥ 7 and with girth at least（r-1）△ is at most（4r-3）△.

关键词： girth coloring acyclic coloring τ-acyclic coloring Lopsided local lemma

A large-scale experimental study on CO_(2) capture utilizing slurry-based ab-adsorption approach

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Chinese Journal of Chemical Engineering 2021年第3期34卷 56-66页

作者： Shuren Yan Peng Xiao ding zhu Hai Li Guangjin Chen Bei Liu State Key Laboratory of Heavy Oil Processing China University of PetroleumBeijing 102249China

The increasing concentration of CO_(2) in atmosphere is deemed the main reason of global ***,efficiently capturing CO_(2) from various sources with energy conservation is of great ***,a series of experiments were carried out to successfully test the slurry-based ab-adsorption method for continuously capturing CO_(2) in the large-scale cycled separation unit with cost-effect taking into account the scale-up criteria.A bubble column(with height 4900 mm and inner diameter 376 mm)and a desorption tank(with volume 310 L)are the essential components of the separation *** novel slurry used in this study was formed with zeolitic imidazolate framework-8 and 2-methylimidazole-water *** influence of operation conditions was investigated *** results show that increasing sorption pressure and slurry height level,decreasing gas volume flow and sorption temperature are beneficial for separation *** volume fraction of CO_(2) in the feed gas was also *** the scale-up effect had been observed and it was found that it exerted a negative effect on CO_(2) capture,depending on experimental conditions,CO_(2) removal efficiency could still reach 85%-95%and the maximum CO_(2) loading in the recycled slurry could be up to0.007 mol·L-1·***,the slurry-based method could be operated well even under very moderate regeneration conditions(333 K and 0.05 MPa),which means that the novel approach shows greater energy conservation than traditional amine absorption methods.

关键词： CO_(2)capture Zeolitic imidazolate framework-8 Slurry Bubble column Scale-up

Set Function Optimization

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Journal of the Operations Research Society of China 2019年第2期7卷 183-193页

作者： Wei-Li Wu Zhao Zhang ding-zhu Du Department of Computer Science University of Texas at DallasRichardsonTX 75080USA Department of Computer Science Zhejiang Normal UniversityJinhua 321004ZhejiangChina

This article is an introduction to recent development of optimization theory on set functions,the nonsubmodular optimization,which contains two interesting results,DS(difference of submodular)functions decomposition and sandwich theorem,together with iterated sandwich method and data-dependent *** potential research problems will be mentioned.

关键词： Set function Optimization DS decomposition・Sandwich theorem Iterated sandwich method

Macrophage activation syndrome as a complication of dermatomyositis: A case report

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World Journal of Clinical Cases 2020年第11期8卷 2339-2344页

作者： ding-Xian zhu Jian-Jun Qiao Hong Fang Department of Dermatology The First Affiliated HospitalCollege of MedicineZhejiang UniversityHangzhou 310003Zhejiang ProvinceChina

BACKGROUND Macrophage activation syndrome(MAS)can be a fatal complication of rheumatic disorders,which occurs most commonly in patients with systemic juvenile idiopathic arthritis or systemic lupus *** has rarely been reported in patients with ***,we describe a fatal case of MAS that developed in an adult patient with *** SUMMARY A 44-year-old woman was admitted to our hospital with fever,generalized rash and muscle *** days later,the fever persisted after the use of antibiotics,and repeat blood culture was *** patient then exhibited a typical Gottron sign and diffuse erythema on the face and neck,which were consistent with a diagnosis of *** patient exhibited limb muscle strength of 2,and electromyography was suggestive of muscle-derived damage,which also supported a diagnosis of *** addition,the patient exhibited high serum ferritin level,cytopenia,liver dysfunction,coagulopathy,enlarged spleen and hypertriglyceridemia,all of which are typical manifestations of *** patient was diagnosed with dermatomyositis complicated by *** a high dose of methylprednisolone was administered for 15 d,the patient’s condition continued to deteriorate and central nervous system symptoms ***,treatment was discontinued,and the patient *** MAS is an important,potentially fatal,complication of *** MAS is rare in dermatomyositis,it should be considered in the differential diagnosis of an unexplained change of hemoglobin,platelet,fibrinogen,ferritin and triglyceride,which may complicate dermatomyositis.

关键词： Macrophage activation syndrome Dermatomyositis Hyperferritinemia Case report Systemic juvenile idiopathic arthritis Inflammatory

Synthesis, characterization, and thermostability of bis(2,2,6,6-tetramethyl-3,5-heptanedionato)barium(Ⅱ)

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Rare Metals 2013年第1期32卷 67-74页

作者： Teng Zhang Hong-Wei Gu Fa-zhu ding Fei Qu Shao-Tao Dai Key Laboratory of Applied Superconductivity Institute of Electrical Engineering Chinese Academy of Sciences

The metal-organic chemical vapor deposition （MOCVD） technique is a promising process for high-tem- perature superconductor YBa2Cu307_6（YBCO） preparation. In this technique, it is a challenge to obtain barium precursors with high volatility. In addition, the purity, evaporation characteristics, and thermostability of adopted precursors in whole process will decide the quality and reproducible results of YBCO film. In the present report, bis（2,2,6,6-tetramethyl- 3,5-heptanedionato）barium（II）（Ba（TMHD）2） was synthe- sized, and its structure was identified by PTIR, 1H NMR, 13C NMR, and ESI-MS spectroscopy. Subsequently, the thermal properties and the kinetics of decomposition were systemati- cally investigated by nonisothermal thermogravimetric anal- ysis methods. Based on the average apparent activation energy evaluated by the Ozawa, Kissinger, and Friedman methods, the volatilization process was discussed, and all results show that Ba（TMHD）2 is unstable and highly sensitive to the change of temperature during the whole evaporation process. There- fore, it is very important to choose suitable volatilization technology and conditions for avoiding Ba（TMHD）2 break- down （or thermal aging） during MOCVD process. Subse- quently, the possible conversion function is estimated through the Coats-Redfern method to characterize the evaporation patterns and follows a phase boundary reaction mechanism by the contracting surface equation with average activation energy of 118.7 ***1-1.

关键词： Ba(TMHD)2 Metal-organic chemical vapordeposition (MOCVD) Synthesis Thermostability

SUPERCONVERGENCE ANALYSIS FOR CUBIC TRIANGULARELEMENT OF THE FINITE ELEMENTSUPERCONVERGENCE ANALYSIS FOR CUBIC TRIANGULARELEMENT OF THE FINITE ELEMENT

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Journal of Computational Mathematics 2000年第5期18卷 541-550页

作者： Qi-ding zhu (Department of Mathematics, Hunan Normal University, Changsha 410081, China ) 湖南师范大学湖南长沙 410081

In this paper, we construct a projection interpolation for cubic triangular element by using othogonal expansion triangular method. We show two fundamental formulas of estimation on a special partion and obtain a superconvergence result of 1- ∈order higher for the placement function and its tangential derivative on the third order Lobatto points and Gauss points on each edge of triangular element.

关键词： Finite element Superconvergence Projection interpolation.

Is proton a charge carrier for δ-MnO_(2) cathode in aqueous rechargeable magnesium-ion batteries?

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Journal of Energy Chemistry 2022年第5期31卷 572-579页

作者： Zhenzhen Liu Xiang Li Jian He Qian Wang ding zhu Yigang Yan Yungui Chen College of Materials Science and Engineering Sichuan UniversityChengdu 610065SichuanChina Institute of New Energy and Low-Carbon Technology Sichuan UniversityChengdu 610207SichuanChina Engineering Research Center of Alternative Energy Materials and Devices Ministry of EducationChengdu 610065SichuanChina

Manganese dioxide(MnO_(2)) is considered as a potential cathode material for aqueous magnesium-ion batteries. However, the charge/discharge mechanism of MnO_(2)in aqueous electrolyte is still unclear. In present study, highly porous δ-MnO_(2) is investigated, which delivers a high capacity of 252.1 m Ah g^(-1) at 0.05 A g^(-1) and excellent rate capability, i.e., 109.7 m Ah g^(-1) at 1 A g^(-1), but a low-capacity retention of 54.4% after 800 cycles at 1 A g^(-1). The two-step discharging process, namely a consequent H^(+) and Mg^(2+) insertion reaction, is verified, by comparing the electrochemical performance of δ-MnO_(2) in 1 M MgCl_(2) and 1 M MnCl_(2) aqueous electrolyte and analyzing detailedly the Mg content and the bonding state of Mn at different charge/discharge state. Furthermore, partial irreversibility of Mg^(-1) ion insertion/extraction is observed, which may be one of the major reasons leading to capacity decay.

关键词： Magnesium-ion batteries Cathode δ-MnO_(2) Mg ion insertion/extraction Proton insertion/extraction

Atmospheric transmission algorithm for pulsed X-rays from high-altitude nuclear detonations based on scattering correction

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Nuclear Science and Techniques 2024年第3期35卷 40-52页

作者： ding-Han zhu Xiong Zhang Xiao-Qiang Li Peng Li Yan-Bin Wang Shuang Zhang State Key Laboratory of NBC Protection for Civilian Beijing 102205China

In high-altitude nuclear detonations,the proportion of pulsed X-ray energy can exceed 70%,making it a specific monitoring signal for such *** pulsed X-rays can be captured using a satellite-borne X-ray detector following atmospheric *** quantitatively analyze the effects of different satellite detection altitudes,burst heights,and transmission angles on the physical processes of X-ray transport and energy fluence,we developed an atmospheric transmission algorithm for pulsed X-rays from high-altitude nuclear detonations based on scattering *** proposed method is an improvement over the traditional analytical method that only computes direct-transmission *** traditional analytical method exhibits a maximum relative error of 67.79% compared with the Monte Carlo *** improved method reduces this error to within 10% under the same conditions,even reaching 1% in certain ***,its computation time is 48,000 times faster than that of the Monte Carlo *** results have important theoretical significance and engineering application value for designing satellite-borne nuclear detonation pulsed X-ray detectors,inverting nuclear detonation source terms,and assessing ionospheric effects.

关键词： High-altitude nuclear detonation Atmospheric transmission Pulsed X-rays Scattering correction Analytical method Monte Carlo method

Synthesis, Characterization and Electrochemical Behavior of p-NiO/n-TiO_2/Polyaniline Composites

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Chemical Research in Chinese Universities 2011年第5期27卷 870-874页

作者： CUI Kun ding Guang-zhu CHEN Shi-fu LIU Jie-ping College of Chemistry and Materials Science Huaibei Normal University Huaibei 235000 t~ R. China

The p-NiO/n-TiO2/polyaniline composites were synthesized via in situ polymerization of aniline. The structure and morphology of the composites were characterized by means of X-ray diffraction（XRD）, scanning electron microscopy（SEM）, Fourier transform infrared spectroscopy（FTIR） and UV-Vis absorption spectroscopy. It was found that the p-n junction p-NiO/n-TiO2 particles were trapped in the polyaniline molecular matrix and the polyaniline was deposited on the surface of the particles to form a kind of flower cluster morphologies. The electrochemical behavior of the polyaniline composites was investigated. The electrochemical reactivity of the polyaniline was influenced by the p-NiO/n-TiO2 particles due to the effect of electron-hole pairs in these p-n junction particles. The reversibility of redox process and current intensity of the polyaniline composites with the changing of potential scan rate were also discussed.

关键词： p-NiO/n-TiO2/polyaniline composite Synthesis Characterization p-n Junction Electrochemical property