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Marked ion current rectification in microchannels

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Science China Chemistry 2017年第6期60卷 685-686页

作者： xing-hua Xia State Key Laboratory of Analytical Chemistry for Life Science School of Chemistry and Chemical Engineering Nanjing University Nanjing 210093 China

Ion current rectification(ICR)is a physical phenomenon caused by asymmetric transport of anions and cations across an ion nanopore/channel,in which the ion current at a voltage of one polarity is much higher or lower than the one of opposite voltage *** ICR was first observed in a nanopipette in 1997,extensive research has been performed using various nanopores/nanochannels,revealing the applicability of ICR in various fields including fluidic logic circuits(i.e.,iontronics),energy conversion and storage,

关键词： polarity asymmetric opposite electrolyte length revealing circuits explain radius Figure

Covalent hadronic molecules induced by shared light quarks

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Communications in Theoretical Physics 2022年第12期74卷 62-86页

作者： hua-xing Chen School of Physics Southeast UniversityNanjing 210094China

After examining Feynman diagrams corresponding to the ■, ■, ■, and ■ hadronic molecular states, we propose a possible binding mechanism induced by shared light quarks. This mechanism is similar to the covalent bond in chemical molecules induced by shared electrons. We use the method of QCD sum rules to calculate its corresponding light-quark-exchange diagrams, and the obtained results indicate a model-independent hypothesis: the light-quark-exchange interaction is attractive when the shared light quarks are totally antisymmetric so they obey the Pauli principle. We build a toy model with four parameters to formulize this picture and estimate binding energies of some possibly-existing covalent hadronic molecules. A unique feature of this picture is that the binding energies of the(I)JP=(0)1+■ hadronic molecules are much larger than those of the (I)JP=(0)1+■ ones, while the(I)JP=(1/2)1/2+■ hadronic molecules have similar binding energies.

关键词： hadronic molecule covalent bond QCD sum rules

Prospects of microwave-induced thermoacoustic imaging

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Journal of Electronic Science and Technology 2023年第3期21卷 21-37页

作者： xing-hua Wang huan Qin Key Laboratory of Laser Life Science(Ministry of Education)&Institute of Laser Life Science College of BiophotonicsSouth China Normal UniversityGuangzhou510631China Guangdong Provincial Key Laboratory of Laser Life Science College of BiophotonicsSouth China Normal UniversityGuangzhou510631China Guangzhou Key Lab of Spectral Analysis and Functional Probes College of BiophotonicsSouth China Normal UniversityGuangzhou510631China

Microwave-induced thermoacoustic imaging(MTAI)has advantages including the large imaging depth,high imaging resolution,high imaging contrast,and fast imaging *** thermoacoustic(TA)group of South China Normal University has dedicated to developing TA imaging for more than a decade and has made many *** review introduces these breakthroughs from two aspects including the improvement in techniques and the exploration of *** the technological level,there are ultrashort microwave pulse(USMP)-induced􀀁TA imaging that can improve the imaging resolution,nonlinear thermoacoustic imaging(NTAI)that can improve the imaging contrast,polarized microwave-induced􀀁thermoacoustic imaging(P-MTAI)that can obtain cellular-level alignment information,and more convenient and accurate handheld and multimodal *** the application side,the optimization and expansion have been carried out,mainly concentrating on breast and myocardial ***,several current research directions are introduced,including the application of P-MTAI on joint imaging and research on whole-body imaging of small animals.

关键词： Applications in biomedical field Microwave-induced thermoacoustic imaging(MTAI) Nonlinear thermoacoustic imaging(NTAI) Polarized microwave-induced thermoacoustic imaging(P-MTAI) Ultrashort microwave pulse (USMP)-induced thermoacoustic imaging

ON THE DIVIDED DIFFERENCE FORM OF FAA DI BRUNO＇S FORMULA

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Journal of Computational Mathematics 2006年第4期24卷 553-560页

作者： xing-hua Wang He-yu Wang Department of Mathematics Zhejiang University Hangzhou 310028 China Computer Science School Zhejiang University Hangzhou 310027 China Mathematics Department of Hong Kong Baptist University Kowloon Hong Kong

The n-divided difference of the composite function h ：= f o g of functions f, g at a group of nodes t0,t1,…,tn is shown by the combinations of divided differences of f at the group of nodes g（t0）,g（t1）,…,g（tm） and divided differences of g at several partial group of nodes t0,t1,…,tn, where m = 1,2,…,n. Especially, when the given group of nodes are equal to each other completely, it will lead to Faà di Bruno＇s formula of higher derivatives of function h.

关键词： Divided difference Newton interpolation Composite function FAA di Bruno's formula Bell polynomial

On the Hermite interpolation

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Science China Mathematics 2007年第11期50卷 1651-1660页

作者： xing-hua WANG Department of Mathematics Zhejiang UniversityHangzhou 310027China

Explicit representations for the Hermite interpolation and their derivatives of any order are ***,suppose that the interpolated function f has continuous derivatives of sufficiently high order on some sufficiently small neighborhood of a given point x and any group of nodes are also given on the *** the derivatives of any order of the Hermite interpolation polynomial of f at the point x are applied to approximating the corresponding derivatives of the function f(x),the asymptotic representations for the remainder are presented.

关键词： Hermite interpolation cycle index numerical differentiation explicit representation remainder

Mathematical Simulation and Design of Three-Phase Bubble Column Reactor for Direct Synthesis of Dimethyl Ether from Syngas

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Journal of Natural Gas Chemistry 2007年第2期16卷 193-199页

作者： Dianhua Liu xing hua Dingye Fang College of Chemical Engineering East China University of Science and Technology Shanghai 200237 China

A three-phase reactor mathematical model was set up to simulate and design a three-phase bubble column reactor for direct synthesis of dimethyl ether （DME） from syngas, considering both the influence of part inert carrier backmixing on transfer and the influence of catalyst grain sedimentation on reaction. On the basis of this model, the influences of the size and reaction conditions of a 100000 t/a DME reactor on capacity were investigated. The optimized size of the 10000 t/a DME synthesis reactor was proposed as follows： diameter 3.2 m, height 20 m, built-in 400 tube heat exchanger （Ф 38×2 mm）, and inert heat carrier paraffin oil 68 t and catalyst 34.46 t. Reaction temperature and pressure were important factors influencing the reaction conversion for different size reactors. Under the condition of uniform catalyst concentration distribution, higher pressure and temperature were proposed to achieve a higher production capacity of DME. The best ratio of fresh syngas for DME synthesis was 2.04.

关键词： dimethyl ether syngas three-phase reactor DME synthesis slurry bed mathematical simulation model

Decay properties of the Zc(3900)through the Fierz rearrangement

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Chinese Physics C 2020年第11期44卷 109-126页

作者： hua-xing Chen School of Physics Beihang UniversityBeijing 100191China School of Physics Southeast UniversityNanjing 210094China

We systematically construct all the tetraquark currents/operators of J^PC=1^+− with the quark configurations[cq][cq],[cq][qc],and[cc][qq](q=u/d),and derive their relations through the Fierz rearrangement of the Dirac and color *** the transformations of[qc][qc]→[cc][qq]and[cq][qc],we study decay properties of the Zc(3900)as a compact tetraquark state;while using the transformation of[cq][qc]→[cc][qq],we study its decay properties as a hadronic molecular state.

关键词： Fierz rearrangement exotic hadron compact tetraquark hadronic molecule interpolating current

Hidden-charm pentaquark states through current algebra:from their production to decay

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Chinese Physics C 2022年第9期46卷 62-93页

作者： hua-xing Chen School of Physics Southeast UniversityNanjing 210094China

There may be sevenD^((*))Σ_(c)^((*))hadronic molecular *** construct their corresponding interpolating currents and calculate their masses and decay constants using QCD sum *** on these results,we calculate their relative production rates inΛ^(0)_(b)decays using current algebra,that is,B(Λ^(0)_(b)→P_(c)K^(-)):B(Λ^(0)_(b)→P′_(c)K^(-)),where P_(c)and P′_(c)are two different *** also study their decay properties via Fierz rearrangement and further calculate these ratios in the J/ψp mass spectrum,that is,B(Λ^(0)_(b)→P_(c)K^(-)→J/ψpK^(-)):B(Λ^(0)_(b)→P′_(c)K^(-)→J/ψpK^(-)).Our results suggest that theD*Σ^(*)_(c)molecular states of JP=1/2^(-)and 3/2^(-)may be observed in future experiments.

关键词： exotic hadron pentaquark state hadronic molecule interpolating current QCD sum rules current algebra Fierz rearrangement

Synthesis of a novel calix[4]arene-based fluorescent ionophore and its metal ions recognition properties

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Chinese Chemical Letters 2009年第1期20卷 13-16页

作者： Qiang Peng xing hua Tang College of Environmental and Chemical Engineering Nanchang Hangkong University Nanchang 330063 People's Republic of China

A novel fluorescent ionophore derived from calix[4]arene and pyrazoline was designed and *** molecular structure was confirmed by ^1H NMR and element *** resulting material shows specific fluorescent behavior toward the Zn^2＋ion among the other divalent metal ions,such as Co^2＋,Ni^2＋,Cu^2＋.The primary results indicate this ionophore material is a potential material for developing efficient fluorescent Zn^2＋ chemosensors.

关键词： Calixarene Pyrazoline Recognition Metal ions