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Modification of FGD gypsum in hydrothermal mixed salt solution

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Journal of Environmental Sciences 2006年第1期18卷 170-175页

作者： wu Xiao-qin wu Zhong-biao Department of Environmental Engineering Zhejiang University Hangzhou 310027 China Department of Chemical Engineering Wuhan University of Science and Technology Wuhan 430081 China

A novel utilization way of the sludge from wet calcium-based flue gas desulfurization （FGD） processes has been developed in this paper. This study focused on the conversion of the FGD gypsum into α-hemihydrate calcium sulfate by a hydrothermal salt solution method at atmospheric pressure. Experimental study has been carried out in a batch reactor. Qualitative and quantitative analyses were made by DSC/TG thermal analysis, SEM, XRD, metalloscope and chemical analysis. The experimental results showed that the modification of FGD gypsum was controlled by the dissolution and recrystallization mechanisms. With the introduction of FGD gypsum the salt solution was supersaturated, then crystal nucleus of α-hemihydrate calcium sulfate were produced in the solution. With the submicroscopic structure of FGD gypsum crystal changed, the crystal nucleus grew up into α-hemihydrate calcium sulfate crystals. Thus ,the modification of FGD gypsum was fulfilled.

关键词： FGD gypsum modification hydrothermal mixed salt solution atmospheric pressure

Board games for quantum computers

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Science China(Information Sciences) 2021年第2期64卷 211-226页

作者： biao wu Hanbo CHEN Zhikang LUO International Center for Quantum Materials School of PhysicsPeking University Wilczek Quantum Center School of Physics and AstronomyShanghai Jiao Tong University Collaborative Innovation Center of Quantum Matter College of Chemistry and Molecular Engineering Peking University

Scalable board games, including Five in a Row(orGomoku) and Weiqi(orGo), are generalized so that they can be played on or by quantum computers. We adopt three principles for the generalization:the first two are to ensure that the games are compatible with quantum computer and the third is to ensure that the standard classical games are the special cases. We demonstrate how to construct basic quantum moves and use them to set up quantum games. There are three different schemes to play the quantized games: one quantum computer with another quantum computer(QwQ), two classical computer playing with each other on one quantum computer(CQC), and one classical computer with another classical computer(CwC). We illustrate these results with the games of Five in a Row and Weiqi.

关键词： quantum Weiqi quantum Go Weiqi Five in a Row board games

Dense 3-uniform hypergraphs containing a large clique

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Science China Mathematics 2018年第3期61卷 577-592页

作者： biao wu Yuejian Peng College of Mathematics and Econometrics Hunan University Institute of Mathematics Hunan University

An r-uniform graph C is dense if and only if every proper subgraph G' of G satisfies λ(G') < λ(G).,where λ(G) is the Lagrangian of a hypergraph G. In 1980's, Sidorenko showed that π(F), the Turán density of an γ-uniform hypergraph F is r! multiplying the supremum of the Lagrangians of all dense F-hom-free γ-uniform hypergraphs. This connection has been applied in the estimating Turán density of hypergraphs. When γ=2 the result of Motzkin and Straus shows that a graph is dense if and only if it is a complete graph. However,when r ≥ 3, it becomes much harder to estimate the Lagrangians of γ-uniform hypergraphs and to characterize the structure of all dense γ-uniform graphs. The main goal of this note is to give some sufficient conditions for3-uniform graphs with given substructures to be dense. For example, if G is a 3-graph with vertex set [t] and m edges containing [t-1]^(3),then G is dense if and only if m≥{t-2 3)+(t-2 2)+1. We also give a sufficient condition on the number of edges for a 3-uniform hypergraph containing a large clique minus 1 or 2 edges to be dense.

关键词： dense hypergraphs Lagrangian of hypergraphs Turan density

Min-max partitioning problem with matroid constraint

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2008年第10期9卷 1446-1450页

作者： biao wu En-yu YAO Department of Mathematics Zhejiang University Hangzhou 310027 China

In this paper, we consider the set partitioning problem with matroid constraint, which is a generation of the k-partitioning problem. The objective is to minimize the weight of the heaviest subset. We present an approximation algorithm, which consists of two sub-algorithms-the modified Edmonds' matroid partitioning algorithm and the exchange algorithm, for the problem. An estimation of the worst ratio for the algorithm is given.

关键词： Matroid Matroid partition Worst ratio

Local Field Distributions in Systems with Dipolar Interaction

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Chinese Physics Letters 2012年第1期29卷 94-97页

作者： YAN Yue wu biao Institute of Physics Chinese Academy of SciencesBeijing 100190 International Center for Quantum Materials Peking UniversityBeijing 100871

We investigate systematically the local field distribution functions of up-spins for systems of dipolar interaction,with particular emphasis on Ising-type lattice *** is found that as the fraction increases,the shape of the distribution function changes from Lorentzian to *** addition,sub-peaks can be induced in the distribution function by non-cubic lattice *** is in stark contrast with a dilute gas system,where the distribution has only one Lorentzian peak for any up-spin fraction.

关键词： distribution lattice dilute

Ehrenfest Time at the Transition from Integrable Motion to Chaotic Motion

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Chinese Physics Letters 2021年第3期38卷 29-32页

作者： Chuan Zhao biao wu International Center for Quantum Materials School of PhysicsPeking UniversityBeijing 100871China Wilczek Quantum Center School of Physics and AstronomyShanghai Jiao Tong UniversityShanghai 200240China Collaborative Innovation Center of Quantum Matter Beijing 100871China

Ehrenfest time depends differently on the Planck constant in integrable motion and chaotic motion. We study how its dependence on the Planck constant changes when there is a continuous transition from regular motion to chaotic motion. We find that the dependence is a weighted compromise between its two distinct dependences in regular and chaotic motions. The study is carried out with the system of periodically driven anharmonic oscillator. As the system is quite typical, the result may apply generally.

关键词： motion. chaotic system

The Maximum Lagrangian of 5-uniform Hypergraphs without Containing Two Edges Intersecting at a Vertex

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Acta Mathematica Sinica,English Series 2022年第5期38卷 877-889页

作者： biao wu Yue Jian PENG MOE-LCSM School of Mathematics and StatisticsHu’nan Normal UniversityChangsha 410081P.R.China School of Mathematics Hu’nan UniversityChangsha 410082P.R.China

Obtaining Turán densities of hypergraph through determining Lagrangian densities have been studied *** showed that the Lagrangian density of an r-uniform hypergraph equals the Turán density of the extension of this ***,Lagrangian density and Turán density are the same for a large class of hypergraphs such as hypergraphs covering *** Pr,sbe the r-uniform hypergraph with two edges intersecting at s *** determined the Lagrangian densities of Pr,sfor r=3 and s=1 or 2,or r=4 and s=2 or *** and Keevash determined for r=3 and s=0,and Bene Watts,Norin and Yepremyan determined for r≥4 and s=*** cases r=5 and s=4 or r=6 and s=5 were determined by Norin and *** showed for r=5,6 or 7,and s=3,4 or 5 *** cases r=4 and s=1 or r=5 and s=2 were determined by Jiang,Peng and wu,and Hu,Peng and wu *** r=5,the only remaining case is s=*** this paper,we determine for this case.

关键词： Hypergraph Lagrangian Turán number

Advancements in animal nutrition: The interplay of feed enzymes, gut health, and nutrient supply in poultry and pig production——A tribute to Professor Mingan Choct's 30-year scientific legacy

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Animal Nutrition 2024年第2期17卷 373-375页

作者： Shu-biao wu School of Environmental and Rural Science University of New England

Animal production is a significant protein source for human consumption(Salter and Lopez-Viso, 2021). The production of monogastric animals has grown enormously in recent decades,particularly of poultry and swine(Rauw et al., 2020). Such growth is attributed to the progress in animal nutrition, disease control,and genetic improvement in response to the global demand for meat(Kumar et al., 2023) and, of course, the tireless efforts of scientists working in the area for the past decades. Among them is Professor Mingan Choct, a monogastric animal nutritionist at the University of New England. He has dedicated his entire academic career to the field, significantly contributing to monogastric animal research and industry. To honour his contribution and celebrate his retirement, we organized a special issue in Animal Nutrition with contributions from a group of prominent researchers in monogastric animal nutrition and health. In this special issue, we published reviews and research papers, 8 in total, with a focus on the nutrition and health of monogastric production animals.

关键词： professor nutrition legacy nutrient supply feed 30-year advancements animal choct

Majorana modes in solid state systems and its dynamics

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Frontiers of physics 2018年第2期13卷 103-109页

作者： Qi Zhang biao wu College of Science Zhejiang University of Technology Hangzhou 310014 China International Center for Quantum Materials School of Physics Peking University Beijing 100871 China Collaborative Innovation Center of Quantum Matter Beijing 100871 China Wilczek Quantum Center School of Physics and Astronomy Shanghai Jiao Tong University Shanghai 200240 China

We review the properties of Majorana fermions in particle physics and point out that Majorana modes in solid state systems are significantly different. The key reason is the concept of anti-particle in solid state systems is different from its counterpart in particle physics. We define Majorana modes as the eigenstates of Majorana operators and find that they can exist both at edges and in the bulk. According to our definition, only one single Majorana mode can exist in a system no matter at edges or in the bulk. Kitaev＇s spinless p-wave superconductor is used to illustrate our results and the dynamical behavior of the Majorana modes.

关键词： Majorana mode Majorana operator anti-particle Kitaev's model dynamical behavior