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Chung-type Law of the Iterated Logarithm for Continuous Time Random Walk

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Acta Mathematicae Applicatae Sinica 2017年第4期33卷 959-966页

作者： Wen-sherlg wang School of Economics Hangzhou Dianzi University Hangzhou 310018 China College of Science Hangzhou Normal University Hangzhou 310036 China

A continuous time random walk is a random walk subordinated to a renewal process used in physics to model anomalous diffusion. In this paper, we establish a Chung-type law of the iterated logarithm for continuous time... 详细信息

关键词： continuous time random walk law of the iterated logarithm stable law anomalous diffusion

The Quasi-Representation Theorem of the Conjugate Cone[L~β(μ,X)]_β~*(о<β<1)

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Acta Mathematica Sinica,English Series 2009年第10期25卷 1729-1740页

作者： Jian Yong wang Department of Mathematics Changshu Institute of Technology Changshu 215500 P. R. China

For 0 〈β 〈 1, the author once wrote a paper to deal with the representation problem of the conjugate cone [L^β[0, 1]β^＊ of complex β-nanach space L^β[0, 1]. In this paper, replacing [0, 1] with a Borel finite measure space （Ω,M,μ） and replacing the complex field C with a Banach space X, we study the representation problem of the conjugate cone [L^β（μ, X）]β^＊ of L^β（μ, X）, and obtain [L^β（μ, X）]β^＊≌L^∞ M^＋（μ, S）, called the Quasi-Representation Theorem of [L^β（μ, X）]β^＊.

关键词： locally β-convex space β-Banach space normed conjugate cone (quasi-)shadow cone quasi-representation theorem

Enhanced degradation of tetracycline by gas-liquid discharge plasma coupled with g-C_(3)N_(4)/TiO_(2)

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Plasma Science and Technology 2024年第9期26卷 69-78页

作者： Zhenhai wang Zikai ZHOU Sen wang Zhi FANG College of Electrical Engineering and Control Science Nanjing Tech UniversityNanjing 211816People’s Republic of China

Plasma-catalysis is considered as one of the most promising technologies for antibiotic degradation in *** the plasma-catalytic system,one of the factors affecting the degradation effect is the performance of the photocatalyst,which is usually restricted by the rapid recombination of electrons and holes as well as narrow light absorption *** this research,a photocatalyst g-C_(3)N_(4)/TiO_(2) was prepared and coupled with gas-liquid discharge(GLD)to degrade tetracycline(TC).The performance was examined,and the degradation pathways and mechanisms were *** show that a 90%degradation rate is achieved in the GLD with g-C_(3)N_(4)/TiO_(2) over a 10 min *** the pulse voltage is conducive to increasing the degradation rate,whereas the addition of excessive g-C_(3)N_(4)/TiO_(2) tends to precipitate agglomerates,resulting in a poor degradation *** redox properties of the g-C_(3)N_(4)/TiO_(2) surface promote the generation of oxidizing active species(H2O2,O3)in *** quenching experiments showed that·OH,hole(h^(+)),play important roles in the TC degradation by the discharge with g-C_(3)N_(4)/TiO_(2).Two potential degradation pathways were proposed based on the *** toxicity of tetracycline was reduced by treatment in the ***,the g-C_(3)N_(4)/TiO_(2) composites exhibited excellent recoverability and stability.

关键词： gas-liquid discharge plasma-catalysis g-C_(3)N_(4)/TiO_(2) TC degradation

Nonreciprocal photon blockade in a spinning resonator coupled to two two-level atoms

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Science China(Physics,Mechanics & Astronomy) 2023年第4期66卷 28-36页

作者： Wei Zhang Tie wang Shutian Liu Shou Zhang Hong-Fu wang School of Physics Harbin Institute of TechnologyHarbin 150001China Department of Physics College of ScienceYanbian UniversityYanji 133002China

We propose a scheme to simultaneously achieve nonreciprocal conventional photon blockade(NCPB) and unconventional photon blockade(NUPB) in a spinning resonator coupled to two two-level atoms. We show that, with the unequal frequency detuning of cavity and atoms from the driving laser, the quantum efect of the nonreciprocal photon blockade can be realized based on two regimes under diferent driving strengths. We confirm that, the NUPB results from the quantum destructive interference between distinct pathways when the driving laser is loaded from one side, whereas the destructive interference is broken when the system is driven from the other side. Moreover, the NCPB originates from whether the single excitation resonance condition is satisfied, corresponding to the opposite driving direction in contrast to the former. Besides, we obtain the optimal nonreciprocal results by appropriately choosing the system parameters. Interestingly, the UPB exhibits stronger robustness to thermal noises,and the nonreciprocity still exists up to a high thermal excitation. This work provides an alternative way to achieve nonreciprocal quantum devices based on the nonreciprocal photon blockade, which may help to develop information network processing.

关键词： nonreciprocity photon blockade two-level atom

Adaptive Equivalent-input-disturbance Approach to Improving Disturbance-rejection Performance

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International Journal of Automation and computing 2020年第5期17卷 701-712页

作者： Ze-Wen wang Jin-Hua She Guang-Jun wang School of Automation China University of GeosciencesWuhan 430074China Hubei Key Laboratory of Advanced Control and Intelligent Automation for Complex Systems Wuhan 430074China School of Engineering Tokyo University of TechnologyHachioji 192-0982Japan

This paper presents an adaptive equivalent-input-disturbance(AEID)approach that contains a new adjustable gain to improve disturbance-rejection performance.A linear matrix inequality is derived to design the parameters of a control *** adaptive law for the adjustable gain is presented based on the combination of the root locus method and Lyapunov stability theory to guarantee the stability of the AEID-based *** adjustable gain is limited in an allowable range and the information for adjusting is obtained from the state of the *** results show that the method is effective and robust.A comparison with the conventional EID approach demonstrates the validity and superiority of the method.

关键词： Adaptive control disturbance rejection equivalent input disturbance(EID) linear matrix inequality(LMI) Lyapunov stability root locus

Radiative Decays of (0^+,1^+) Strange-Bottom Mesons

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Communications in Theoretical Physics 2009年第7期52卷 91-98页

作者： wang Zhi-Gang Department of Physics North China Electric Power University Baoding 071003 China

In this article, we assume that the （0^＋,1^＋） strange-bottom mesons are the conventional bs mesons, and calculate the electromagnetic coupling constants d, g1, g2, and g3 using the light-cone QGD sum rules. Then we study the radiative decays Bs0→Bs^＊γ, Bs1→Bsγ, Bs1→Bs^＊γ, and Bs1→Bs0γ, and observe that the widths are rather narrow. We can search for the （0^＋, 1^＋） strange-bottom mesons in the invariant Bsπ^0 and Bs^＊π^0 mass distributions in the strong decays or in the invariant Bs^＊γ, and Bsγ mass distributions in the radiative decays.

关键词： strange-bottom mesons light-cone QCD sum rules

Experimental study of the mechanism of nanofluid in enhancing the oil recovery in low permeability reservoirs using microfluidics

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Petroleum Science 2023年第1期20卷 382-395页

作者： Kang wang Qing You Qiu-Ming Long Biao Zhou Pan wang School of Energy Resources China University of GeosciencesBeijing100083China School of Petroleum Engineering China University of PetroleumQingdao266580ShandongChina Chengdu Natural Gas Chemical General Factory Chengdu610213SichuanChina

Due to the low porosity and low permeability in unconventional reservoirs,a large amount of crude oil is trapped in micro-to nano-sized pores and throats,which leads to low oil *** have great potential to enhance oil recovery(EOR)in low permeability *** this work,the regulating ability of a nanofluid at the oil/water/solid three-phase interface was *** results indicated that the nanofluid reduced the oil/water interfacial tension by two orders of magnitude,and the expansion modulus of oil/water interface was increased by 77% at *** addition,the solid surface roughness was reduced by 50%,and the three-phase contact angle dropped from 135(oil-wet)to 48(water-wet).Combining the displacement experiments using a 2.5D reservoir micromodel and a microchannel model,the remaining oil mobilization and migration processes in micro-to nano-scale pores and throats were *** was found that the nanofluid dispersed the remaining oil into small oil droplets and displaced them via multiple mechanisms in porous ***,the high strength interface film formed by the nanofluid inhibited the coalescence of oil droplets and improved the flowing *** results help to understand the EOR mechanisms of nanofluids in low permeability reservoirs from a visual perspective.

关键词： Nanofluid EOR mechanism Micromodel Low permeability Three-phase interface

Soluble and Degradable Polyimides with Phenyl-2-pyridyl Ether Structure:Synthesis and Characterization

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Chinese Journal of Polymer Science 2015年第3期33卷 481-489页

作者：杨逢春 Jing wang Lin Chen Xin wang Xiang-yu Chen 张欣 Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education College of Chemistry and Materials ScienceNorthwest University Samsung China Semiconductor Company Limited. Shaanxi Provincial Key Laboratory of Electroanalytical Chemistry Institute of Analytical ScienceNorthwest University

A diamine monomer o-phenylenedioxybis（5-amino-2-pyridine） was synthesized via reduction of a dinitro compound o-phenylenedioxybis（5-nitro-2-pyridine）, producing a series of new polyimides from this diamine and various commercially available aromatic dianhydrides via conventional two-stage processes. The resulting polyimides are able to form tough and transparent films, with decomposition temperatures in the range of 529-551 ℃, and can be dissolved in organic polar solvents. Meanwhile, these polyimides can be degraded in a hydrazine hydrate medium, a degradation mechanism proposed by analyzing the degradation products suggests that the degradable properties could be attributed to the phenyl-2-pyridyl ether structure in the polymer. In addition, the transformation of the compound structure from dinitro compound to damine monomer in the synthetic process is discussed in respect to X-ray structure.

关键词： Monomer structure Polymer solubility Degradable polyimide.

Realization of Oriented and Nanoporous Bismuth Chalcogenide Layers via Topochemical Heteroepitaxy for Flexible Gas Sensors

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Research 2022年第4期2022卷 211-221页

作者： Zhiwei wang Jie Dai Jian wang Xinzhe Li Chengjie Pei Yanlei Liu Jiaxu Yan Lin wang Shaozhou Li Hai Li Xiaoshan wang Xiao Huang Wei Huang Institute of Advanced Materials(IAM) Nanjing Tech University(NanjingTech)30 South Puzhu RoadNanjing 211816China Frontiers Science Center for Flexible Electronics Xi'an Institute of Flexible Electronics(IFE)and Xi'an Institute of Biomedical Materials EngineeringNorthwestern Polytechnical University127 West Youyi RoadXi'an 710072China Key Laboratory for Organic Electronic e Information Displays(KLOEID)and Jiangsu Key Laboratory for Biosensors Institute of Advanced Materials(IAM)Nanjing University of Posts and Telecommunications9 Wenyuan RoadNanjing 210023China

Most van der Waals two-dimensional(2D)materials without surface dangling bonds show limited surface activities except for their edge *** Bi_(2)Se_(3),a topological insulator that behaves metal-like under ambient conditions,has been overlooked on its surface ***,through a topochemical conversion process,ultrathin nanoporous Bi_(2)Se_(3) layers were epitaxially deposited on BiOCl nanosheets with strong electronic coupling,leading to hybrid electronic states with further bandgap *** oriented nanoporous Bi_(2)Se_(3) layers possessed largely exposed active edge sites,along with improved surface roughness and film forming ability even on inkjet-printed flexible *** room-temperature NO_(2) sensing performance was achieved compared to other 2D materials under bent *** work demonstrates that creating nanoscale features in 2D materials through topochemical heteroepitaxy is promising to achieve both favorable electronic properties and surface activity toward practical applications.

关键词： chemical bonds roughness